System of "smart" cable for bridge using built-in sensors with fibre diffraction gratings

FIELD: construction.

SUBSTANCE: invention relates to the system of "smart" cable for bridge with the use of built-in sensors based on fibre Bragg gratings (FBG) and can be used in cable load-bearing structures of cable, suspension, arched and other types of bridges. System comprises anchor glass, plate for separating wires, connecting clutches, sensor based on fibre diffraction grating and cable itself. Sensor based on fibre diffraction grating comprises strain gauge 9 with fibre diffraction grating and temperature sensor with fibre diffraction grating. The ends of optical fibres of strain gauge 9 and temperature sensor are led outwards. Assembled strain gauge 9 is rigidly connected with the steel wire in the connection coupling. Assembled temperature sensor is suspended on the steel wire in the connection coupling. Openings are punched in the plate to separate wires. Protective steel tube is dipped in advance in the front part into the connecting sleeve and anchor glass.

EFFECT: system improves survival of sensors and optic fibre during manufacture and operation of cable, provides reliable sealing of sensors and permits to transmit signals effectively and accurately from fibre diffraction gratings outward from cable.

11 dwg

 

1. Scope

This invention relates to a system of "intelligent" rope bridge using built-in sensors based on fiber Bragg gratings (FBG) and can be used in cable supporting structures, cable-stayed, suspension, arch, and other types of bridges.

2. The level of technology

Cable system modern dlinnoplamennyh bridges is a main structural element of the cable-stayed and suspension bridges, which can withstand the weight of the bridge construction, and dynamic load. The vast majority of these bridges are arranged so that the cable system is based on the load-bearing columns, and therefore, the operational state of the cable system is a key indicator of how safe is the state of the bridge. However, the features of the circuit design, the influence of environmental factors, corrosion, accumulation of fatigue of materials and other causes during the term of service will inevitably lead to varying degrees of deterioration and damage to the cable system. If it was possible to organically integrate the sensors inside the cable and measure the internal voltage, temperature, and other factors, then a simple suspension cable would be a "smart" cable with automatic self-test, one is temporarily allowing you to track its overall carrying capacity and carrying capacity of individual elements, better control of structural safety and operational condition of the rope and the whole bridge; to promptly detect the fault and to prevent the occurrence of sudden emergency situations.

Fiber diffraction grating is a great receptive element with high sensitivity, reflecting the smallest deformation changes from the external environment by the shift of the diffraction of the reflected waves (Bragg reflection), by monitoring the voltage, temperature, and other indicators of patterns in real-time. She is not afraid of aggressive environment, not susceptible to interference from noise, is not affected by electromagnetic radiation, performs the function of receiving and transmitting the signal, has a simple structure, easy to use, has a high accuracy in the measurements, etc. However, without special technical solutions fiber diffraction grating is very fragile and brittle, with arbitrary installing it on the cable can quickly be damaged. Technological connection of a fiber grating with a rope should address the following questions: how to improve the survival of sensors fiber gratings and fiber during installation and operation of a cable; how to ensure process reliability Datca is s fiber gratings; as the signals from the diffraction gratings effectively and accurately convey inside the cable out.

3. The invention

The purpose of the invention is to overcome the above disadvantages, it proposes to increase the survival rate sensors with fiber gratings and fiber during installation and operation of a cable, provides the technological reliability of sensors with fiber diffraction gratings; can efficiently and accurately transmit signals from fiber diffraction gratings inside the cable out.

The purpose of the invention is implemented as follows: the system of "smart" rope bridge using built-in sensors based on fiber diffraction Bragg gratings (FBG) includes anchor glass plate for separating wires, mounting clutch, built-in connecting the clutch sensor based on fiber Bragg gratings and the rope. Sensor based on fiber Bragg gratings (FBG) includes a strain gauge sensor with fiber diffraction grating and the temperature sensor with fiber diffraction grating. Installation of strain gauge with fiber diffraction grating, and a temperature sensor with a fiber diffraction grating is produced with the subsequent release of the ends of the sensors out. After installing tensome the systematic sensor is rigidly connected with a steel wire of the outer layer of the rope in front of a flanged coupling, and a temperature sensor attached to a steel wire into the mounting sleeve. The sensors pass through the apertures of said plate for separating wires, connecting coupling, anchor glass, and a protective pipe. The free ends of the probes are released from the holes of said plate to separate the wires and connected with fiber-optic cable. Fiber optic cable is released from the cable through the protective pipe and is connected to a demodulator fiber diffraction grating. Control the internal temperature of the cable is performed by monitoring changes in the length of the diffraction wavelength of the fiber grating through the temperature sensor with fiber diffraction grating, and using a strain gauge with a fiber diffraction grating and associations compensated data with the temperature of the diffraction grating is a structural control voltage steel wire rope and load bearing capacity of the entire rope.

The design of the strain gauge with a fiber grating is as follows: the sensor consists of a first fiber grating, the second steel pipe, the first steel pipe, the first protective steel pipe with stewed in diameter, and supports, United with steel wire rope. Specified first protection steel pipe is used for the number 1 thing; the second steel pipe, the support and the first steel pipe - in 2 pieces. Two second steel pipe, two supports (9-4) and the first two steel pipes are located symmetrically on the left and right sides relative to the specified first protection steel pipe, and the diameter of the second steel pipe < a diameter of the first steel pipe < a diameter of the first protective steel pipe. On the second steel pipes are made lengthwise cuts, then they ends are connected with the first steel pipe and inserted into holes in the top of the support. The first steel pipes with different ends are inserted into the stewed on the diameter of the first protective steel pipe of appropriate length; the other end of each of the first steel pipe is inserted into the second steel pipe so that the first fiber diffraction grating was held at the center of the first protective steel pipe, the second steel pipe and the first steel pipe. The ends of the fiber grating rigidly fixed with glue in the notches of the second steel pipe and removed from the pipe, the edges of the cutouts are protected by the first heat shrinkable sleeve. For strong connection strain gauge steel wire rope connection and the sensor itself covered with a protective layer of adhesive sealer. In the last operation from top to additionally the sealing layer of the adhesive tape. Build the specified temperature sensor with fiber diffraction grating is as follows: temperature sensor with fiber diffraction grating consists of the second fiber grating, the second protective pipe and the second heat shrinkable sleeves. The second fiber grating is suspended inside the second protective tube (10-2), its end is being output, the output area is fixed by adhesive and is protected by the second shrinkable sleeve.

The positive effect from the use of the invention consists in the following:

The invention is a system of "intellectual" rope bridge using sensors based on fiber diffraction Bragg gratings (FBG), built in mounting the clutch cable, which, using an external demodulator for fiber diffraction grating, measures the length change of the Central wavelength of the fiber grating that allows timely monitoring of the development of internal stresses in the cable and its load-carrying capacity, thus satisfying the requirements of condition monitoring of large bridges and increasing the degree of safety of their operation.

4. Description of the drawings

Figure 1. shown schematically strain sensor with fiber diffraction grating.

Figure 2. shown schematically Deut what I steel pipe.

Fig..3 is shown schematically support.

Figure 4 shows a section a-a figure 3

Figure 5 shows the connection of a wire rope with a strain gauge sensor with fiber diffraction grating.

Figure 6 shows the temperature sensor with fiber diffraction grating.

Fig..7 shows the basic block diagram of the rope.

On Fig shows the cross section of the plate to separate the wires.

Figure 9 shows the part of the cable hidden in a steel pipe.

Figure 10 shows the structure of intelligent rope bridge using sensors with fiber Bragg grating (FBG).

Figure 11 shows the control scheme of intelligent rope bridge using sensors based on fiber Bragg gratings (FBG).

Positions on the pictures:

1 - anchor glass;

2 - epoxy filler anchor;

3 - steel wire;

4 - connecting coupling;

5 - plate to separate the wires

5-1 - hole;

6 - sealing filler connection coupling;

7 - protective steel tube;

8 - fiber cable;

9 is a strain gauge sensor with fiber diffraction grating;

10 - temperature sensor with fiber diffraction grating;

11 - rope;

12 - demodulator for fiber diffraction gratings;

9-1 the first fiber, diffractio the Naya array;

9-2 second steel pipe;

9-3 - the first steel pipe;

9-4 - bearing;

9-5 is the first shrinkable sleeve;

9-6 first protective steel pipe;

10-1 - second fiber grating;

10-2 - second protective steel pipe;

10-3 - second heat-shrink sleeve 2.

5. Detailed description of the invention

Installing internal sensors for measuring the carrying capacity of a cable is not an easy task. Installing an internal strain gauge 9 with fiber diffraction grating (fiber Bragg grating (FBG)) is as follows:

Figure 1 shows the diagram of the strain gauge with fiber diffraction grating. Figure 1 shows that the strain gauge 9 with fiber diffraction grating consists of a first fiber grating 9-1, the second steel pipe 9-2, the first steel pipe 9-3, stewed in the diameter of the first protective tube 9-6, and bearings 9-4 connected with steel wire rope. Specified the first protective tube 9-6 is used in a quantity of 1 unit; the first steel pipe 9-3, bearing 9-4 and the second steel pipe 9-2 - in 2 pieces. The first two steel pipes 9-3, two supports 9-4 and two second steel pipe 9-2 are located symmetrically on the left and right sides relative to the specified first protective pipe 9-6, while dia is the Tr of the second steel pipe 9-2 < the diameter of the first steel pipe 9-3 < a diameter of the first protective tube 9-6. The Central part of the second steel pipe 9-2 with a cutout shown in figure 2. Steel pipe 9-3 connected with the supports 9-4 by installing pipes 9-3 in holes in the top of the support 9-4 (see figure 3 and figure 4) and is cut in the middle into two parts; the point of cutting is to transfer the force directly on the diffraction grating and to avoid the influence of the deformation on the first steel pipe (9-3). On the two ends of the first steel pipe (9-3) with two sides worn protective pipe (9-6) slightly larger diameter and appropriate length, protecting the connection point of the first cut of steel pipes (9-3). At opposite ends of the first steel pipe (9-3) are inserted the ends of the second steel pipe (9-2). The first fiber diffraction grating (9-1) with the two ends of the rope is fixed on glue in the cut second steel pipes (9-2) so that the center of the grid passed through the centers of the first steel pipe (9-3), the second steel pipe (9-2) and the first protective tube (9-6). The outer ends of the second steel pipe (9-2) are protected with heat-shrink sleeve (9-5), and the free ends of the optical fibers of the specified first diffraction grating (9-1) pulled one from each of the opposite ends of the second steel pipe (9-2).

Installing internal sensor (10) the temperature is reconnai diffraction grating is as follows: under 6 sensor (10) temperature with fiber diffraction grating consists of the second fiber grating (10-1), the second protective tube (10-2) and the second heat shrinkable sleeves (10-3). The second diffraction grating (10-1) is suspended inside the second protective tube (10-2), its end is being output, the output area is fixed by adhesive and is protected by the second heat shrinkable sleeve (10-3).

Placing strain gauge 9 with fiber diffraction grating and the sensor 10 with fiber diffraction grating in the inner part of the cable, consider the signal from the sensors. Figure 7 shows a typical structure of a cable, which consists of anchor glass 1, epoxy filler (2) anchor glass, steel wire 3, the mounting of the clutch 4, the plate 5 for separating wires, sealing filler 6 of the connecting sleeve and the cable 11. The plate 5 to separate the wires are holes 5-1, as shown in Fig. The holes 5-1 inserted insulating steel tube 7 that act as channels for fiber optic cable. Requirements for steel tubes 7 to withstand lateral pressure epoxy filler 2 anchor glass. When filling the anchor Cup 1 epoxy filler 2 and its subsequent heat treatment in the furnace is hard fixing steel wire inside anchor glass. After filling the anchor glass strain gauge 9 with fiber diffraction d is ekoi finds a connection with outer steel wire 3 cable in the zone of connection of the clutch 4 through the support 9-4, as shown in Figure 5 and Figure 9. All changes affecting the steel wire 3 is effectively transmitted on fiber diffraction grating strain gauge 9. Himself strain gauge 9 is covered by the protective layer using the adhesive sealer, outside of the strain gauge 9 is also sealed with adhesive tape. After sealing strain gauge 9 with fiber diffraction grating becomes a finished form shown in Fig.9. After Assembly, the temperature sensor 10 with a fiber diffraction grating attached to a steel wire rope inside the mounting of the clutch 4, and the optical fiber cable is put inside a protective steel tube 7. The connecting sleeve 4 is filled with a sealing filler 6, which solidifies at ordinary temperature and provides rigid fixation. After that, the design of "smart" cable becomes a finished look, as shown in Fig.10.

Fiber optic cable 8, derived from "intelligent" anchor glass, is connected to the demodulator fiber diffraction grating 12, as shown in figure 11. Control the internal temperature of the cable is performed using a temperature sensor with a fiber diffraction grating by controlling using fiber grating changes the diffraction length in the wave and using a strain gauge with a fiber diffraction grating and the Association for compensation data with the temperature of the diffraction grating is the control voltage steel wire inside cable and carrying capacity of the entire rope.

The system of "smart" rope bridge using built-in sensors based on fiber diffraction gratings containing anchor glass (1), plate (5) for separating wires, connecting coupling (4)built into the mounting sleeve (4) sensor based on fiber diffraction gratings and the cable (11), with the sensor based on fiber diffraction gratings includes a strain sensor (9) with fiber diffraction grating and the temperature sensor (10) with fiber diffraction grating, characterized in that the strain sensor (9) with fiber diffraction grating and the temperature sensor (10) with fiber diffraction grating is first packaged into an Assembly, with the free ends of the optical fibers are led out, Packed in the Assembly of the strain sensor (9) is rigidly connected with a steel wire (3) the outer layer of the cable connecting the clutch (4), Packed in an Assembly, the temperature sensor (10) with fiber diffraction grating is suspended on a steel wire (3) into the mounting sleeve (4)in the plate for separating wires punched hole (5-1), protective steel tube (7) embedded in the front in mounting sleeve (4) and anchor glass (1), protective steel tube (7) vivide is and outwardly through holes (5-1) of said plate to separate the wires (5), the free ends of the optical fiber strain sensor (9) with fiber diffraction grating temperature sensor (10) with fiber diffraction grating are connected with fiber optic cable (8), the free end of the fiber optic cable is led outwards from the cable through the protective steel tube (7) and the free end of the fiber optic cable is led out to the outside of the cable, connected to the demodulator (12) fiber diffraction grating, the design of the sensor Assembly with a fiber grating is as follows: strain sensor (9) with fiber diffraction grating includes: a first fiber diffraction grating (9-1), the first steel pipe (9-3), the second steel pipe (9-2), the first protective pipe (9-6), and support (9-4), and it contains one of the first protective tube (9-6), the first two steel pipes (9-3), two supports (9-4) and two second steel pipe (9-2), while the first two steel pipes (9-3), two supports (9-4) and two second steel pipe (9-2) are located symmetrically on the left and right sides relative to the specified first protective pipe (9-6), and the diameter of the second steel pipe (9-2) < a diameter of the first steel pipe (9-3) < a diameter of the first protective tube (9-6), while in the middle part of the second steel pipe (9-2) longitudinal cut neckline and upper parts of the supports (9-4) punched holes, with the first steel t the UBA (9-3) has been passed through the hole, located in the upper part of the tower (9-4), and is connected to the support (9-4), the two ends of the first protective tube (9-6) are connected respectively with one of the two ends of the first steel pipe, and the opposite end of the first steel pipe (9-3) is connected to the end of the second steel pipe (9-2); the first fiber diffraction grating (9-1) has been passed through the second steel pipe (9-2), the first steel pipe (9-3) and the first protection steel pipe (9-6), the zone of the first fiber grating (9-1) is located in the Central area of the first protective pipe (9-6), and the two ends of the first fiber grating (9-1) is fixed with glue in the notches of the second steel pipe (9-2), the area of the cutout of the second steel pipe (9-2) worn outside the first heat-shrink sleeve (9-5), while the free ends of the optical fiber with two ends of the first fiber grating (9-1) are output to the outside from the end of the second steel pipe (9-2), and bearing strain sensor (9) with fiber diffraction grating are connected with steel wire rope, strain sensor (9) with fiber diffraction grating is closed protective cover, and the sealing space protective sheath and steel wire is performed using putty, and after sealing with mastic adhesive tape is used to seal the gap steel wire, and thus receive the full is collected using strain gauge with fiber diffraction grating, the design of the Assembly of the temperature sensor 10 with a fiber diffraction grating is as follows: the temperature sensor 10 with a fiber diffraction grating includes a second fiber diffraction grating (10-1), the second protective steel pipe (10-2) and the second shrinkable sleeve (10-3), the second fiber grating (10-1) suspended inside the second protective steel tube (10-2), the free ends of the optical fiber to the second fiber gratings are out of the second protective steel pipe (10-2), the free ends of the fiber are fixed with glue in the area where they are ejected, and a second closed heat shrink clutch (10-3).



 

Same patents:

FIELD: physics.

SUBSTANCE: problem is solved by designing a fibre-optic pressure sensor, having a housing with two tubular elements, having at least one plugged end, mounted in the housing such that the second end of the first tubular element is connected to the housing and is linked with a channel for feeding working medium, and the second end of the second tubular element is open and linked with the inside of the housing through which is passed an optical fibre with two Bragg gratings, attached by areas with the Bragg gratings directly to the outer cylindrical surface of the tubular elements such that one of the gratings is located on the first tubular element and the second grating is located on the second tubular element. The problem is also solved by mounting the second tubular element to the inner wall of the housing and by mounting the second tubular element to the inner wall of the housing coaxially to the first tubular element. The tubular elements are made of the same material and have identical geometrical dimensions. The problem is also solved directing portions of the optical fibres equipped with Bragg gratings along the edge of the cylindrical surface of the tubular elements. The disclosed design of the fibre-optic pressure sensor enables to solve the problem of quality and reliable measurement of pressure of working medium of remote objects with transmission of information over a fibre-optic link for long-term operation, up to several years, without intermediate maintenance and adjustment procedures.

EFFECT: simple design of a fibre-optic pressure sensor, assembly thereof and avoiding the need to adjust sensor elements thereof during assembly, smaller size of the sensor and high reliability and accuracy of measuring pressure.

6 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed system comprises light source to transmit light onto shaft surface via multiple optic fibres made at multiple points nearby said surface in, in fact, axial direction between the ends of at least one shaft, high-temperature reflection probe built around fibre bundle to detect light reflected from shaft surface and mechanism to measure torque or oscillation at the shaft. The latter comprise coding mechanism composed of changed texture shaped to wedge-like groove on shaft surface of variable depth. Said depth generates the front and rear working point signals so that appropriate time delay can be detected from whatever two positions of said groove for determination of shaft twist angle by differentiation of reflection pattern characteristics during every rotation cycle.

EFFECT: higher precision of measurements.

23 cl, 24 dwg

FIELD: measuring equipment.

SUBSTANCE: invention belongs to fibre-optical sensors and can be used for check and measurement of parameters of voltage. The fibre-optical sensor of spiral structure is the multi-turn spiral element created by a spring wire. The set of a teeth of deformation is continuously distributed on the top surface and the bottom surface of a spring wire in the longitudinal direction along a spring wire; in two adjacent turns of the spring wire the deformation teeth on the bottom surface of the top turn of the spring wire and deformation teeth on the top surface of the bottom turn of the spring wire are arranged in staggered order to each other. An alarm optical fibre is clamped between deformation teeth on the bottom surface of the top wire of the spring wire and deformation teeth on the top surface of the bottom turn of the spring wire and is connected to the test facility by the optical fibre of transfer.

EFFECT: increase of accuracy of measurement.

10 cl, 10 dwg

FIELD: measuring equipment.

SUBSTANCE: invention belongs to area of instrumentation and can be used for creation of distributive systems of measurement of temperature and deformation. The Brillouin system for tracking of temperature and deformation contains one - or bilateral fibre with a set of fibre Bragg gratings (FBG) on different lengths of waves and a laser system with the setting excitation, adjusted in a range essentially bigger, than Brillouin shift. FBG are distributed along the length of the placed fibre and serve as chosen reflectors of length of the wave, allowing to support operation of the device even in case of a rupture of fibre.

EFFECT: increase of accuracy and reliability of these measurements.

7 cl, 4 dwg

FIELD: electricity.

SUBSTANCE: invention is referred to electric cable with in-built strain-gage fit specifically to measure static and dynamic deformations, in particular, bending strain. Method of bending strain control for electric cable includes stages of the cable equipment with peripheral and mechanically unsymmetrical bearing element having higher resistance to tensile loads than to compression ones and with fibre-optical sensor.

EFFECT: invention provides for high duty cables, in particular, in mobile units, controllability and traceability of bending strain area.

9 cl, 15 dwg

FIELD: electricity.

SUBSTANCE: electric cable with strain-gage located longitudinally along the cable and containing strain-gage optical fibre installed in flexible neutral area that surrounds and includes flexible neutral longitudinal axis of the electric cable, and at least two longitudinal structural elements where at least one of at least two longitudinal structural elements represent a core containing electric conductor with strain-gage in-built into filler resistant to strain; it connects at least one of at least two longitudinal structural elements with strain-gage. By means of open cable structure strain endured by at least one of at least two longitudinal structural elements can be transmitted to strain-gage at least in stretched state. In preferred variants of implementation the electric cable represents high-duty cable. Invention is also related to control method of strain and, preferably, temperature of electric cable.

EFFECT: invention is oriented to creation of deformation control system to measure at least stretching strain for several electrical cables and, in particular, several high-duty cables.

30 cl, 12 dwg

FIELD: process engineering.

SUBSTANCE: glass fibre is introduced in composition used for forming controlled object as a material similar to that used as a filler for forming part carcass matrix, that glass fibre allows channeling light beam there through. Note here that glass fibre intact lengths, longer than said part, are used to be arranged to cross paths of probable defect development in part sections not subjected to processing. Occurrence of defect is detected by light beam passage or decreased in emergent light flux brightness.

EFFECT: efficient detection of defects.

6 cl, 1 dwg

FIELD: physics.

SUBSTANCE: optical fibre structure with Bragg lattices is put into composite material during production thereof. The spectral position of peaks of the Bragg lattices is measured after making the structure from the composite material and distribution of mechanical and thermal deformations inside the structure of the composite material is determined by solving the system of equations: , where f(T,ε) is the distribution function of mechanical and thermal deformations on the structure made from composite material (T is the temperature value, ε is the deformation value); f(Ex, y, z) is the distribution function of elastic properties of the structure made form composite material, Ex, y, z is the Young 's modulus tensor; f(αx, y, z, vx, y, z) is the distribution function of thermal characteristics of the composite material (αx, y, z is the coefficient of volume expansion tensor, vx, y, z is the thermal conductivity coefficient tensor);f(Fload, FT) is the distribution of mechanical and temperature effects on the structure made from composite material (Fload is the value of the mechanical effect, FT is the value of the temperature effect); fFBG(T,ε) is the function of total deformation on the path of the optical fibre with Bragg lattices (T is the temperature value, ε is the deformation value); fi-FBG(Δλ) is shift transformation function of the position of the i-th peak of the Bragg lattice to the temperature value and deformation (Δλ is the displacement of the peak of the Bragg lattice). The optical fibre contains two or more Bragg lattices which are not more than 5 mm long. The distance between the Bragg lattices and one optical fibre is not less than 5 mm.

EFFECT: high measurement accuracy.

3 cl, 15 dwg

FIELD: physics.

SUBSTANCE: proposed transducer comprises load secured on controlled element and strain-gage transducer to convert voltage across stress-optical element into electric signal, and signal processing unit. Load is made up of plate to concentrate strain at stress-optical element. Stress-optical element is fixed in said plate as-stressed so that initial stress force acts in two mutually perpendicular directions. Note that stress-optical element is fixed at plate thinned center by means of Morse taper. Note also that, additionally, two mutually perpendicular through cuts are made not corrupting plate integrity, cuts axes being directed at 45° to loads axis. Cuts axes are aligned with that of taper hole for stress-optical element attachment.

EFFECT: higher sensitivity, thermal compensation.

5 cl, 1 dwg

FIELD: measurement technology.

SUBSTANCE: declared invention refers to the measurement of the stress of wall in hollow product. Method of determination of circumferential stress of wall in the hollow product is based on the polarization optical method. When implementing the method the hollow product located in immersion liquid is X-rayed with polarized light. The analysis made of the image of double refraction of polarised light rays from their passing through the mentioned product. Upon the results of the analysis the circumferential stresses in the mentioned product is determined. When determining the circumferential stresses the Y-raying of the hollow product located in the immersion liquid with polarised light is realised from inside of the hollow product, and the analysis of the watched image of double refraction of polarised light rays is made from the their passing through one of the diametrically opposite parts of the mentioned product's wall.

EFFECT: improvement of the measurement accuracy, simplification of construction and expansion of the features.

2 cl, 1 dwg, 1 ex

FIELD: transport.

SUBSTANCE: antirust protection system for structures comprising stay ropes includes multiple assemblies operated under tension, each of which consists of parallel steel elements passing between the first and second anchor attachments and incorporates two opposite ends, the first and second ones. Note that the said first end interacts with the first anchor attachment, while the second one interacts with the second anchor attachment. The antirust protection system uses the tensions element not furnished with permanent antirust protection and called "unprotected elements operated under tension". The said system comprises multiple stay pipes enveloping the assembly operated under tension, each consisting of unprotected elements operated under tension. It includes also a drying device allowing producing air with the preset mean humidity content, that is, the so-called, "dry air", designed to feed dry air from the drying device into preset points, each arranged on one of three devices, namely, on the first anchor attachment, second anchor attachment and multiple stay pipes, a ventilation device to force dry air into the pipes from the said multiple dry air feed pipes and test, measurement and control appliances.

EFFECT: antirust protection system not increasing diameter of all operating elements operated under tension and making assembly to be operated under tension, continuous control of aforesaid system.

20 cl, 3 dwg

FIELD: suspension cables and cable clamps for suspension cables, particularly to prevent mutual transversal displacement of pipe and at least one cable loosely passing through the pipe.

SUBSTANCE: method involves selecting at least one pipe section of predetermined longitudinal dimension; creating at least one fixing member between pipe and cable passing through the pipe, wherein at least one fixing member eliminates space between pipe and cable. The fixing member is created by locally injecting substance in the first fluid state into the pipe and providing substance hardening to obtain the substance in the second, non-fluid, state. Said injection operation involves arranging at least one channel in pipe so that proximal channel end is outside the pipe and remote end is inside the pipe; arranging cable in pipe by several fiber insertion in pipe to create bundle including predetermined number of fibers and cable; adjusting remote channel end position in pipe so that remote end is within predetermined pipe section to create fixing member and injecting said substance in channel through proximal end to create fixing member.

EFFECT: increased service life.

14 cl, 7 dwg

The invention relates to the field of bridge construction and in particular to a device to keep from tipping over spans in the transverse direction

FIELD: suspension cables and cable clamps for suspension cables, particularly to prevent mutual transversal displacement of pipe and at least one cable loosely passing through the pipe.

SUBSTANCE: method involves selecting at least one pipe section of predetermined longitudinal dimension; creating at least one fixing member between pipe and cable passing through the pipe, wherein at least one fixing member eliminates space between pipe and cable. The fixing member is created by locally injecting substance in the first fluid state into the pipe and providing substance hardening to obtain the substance in the second, non-fluid, state. Said injection operation involves arranging at least one channel in pipe so that proximal channel end is outside the pipe and remote end is inside the pipe; arranging cable in pipe by several fiber insertion in pipe to create bundle including predetermined number of fibers and cable; adjusting remote channel end position in pipe so that remote end is within predetermined pipe section to create fixing member and injecting said substance in channel through proximal end to create fixing member.

EFFECT: increased service life.

14 cl, 7 dwg

FIELD: transport.

SUBSTANCE: antirust protection system for structures comprising stay ropes includes multiple assemblies operated under tension, each of which consists of parallel steel elements passing between the first and second anchor attachments and incorporates two opposite ends, the first and second ones. Note that the said first end interacts with the first anchor attachment, while the second one interacts with the second anchor attachment. The antirust protection system uses the tensions element not furnished with permanent antirust protection and called "unprotected elements operated under tension". The said system comprises multiple stay pipes enveloping the assembly operated under tension, each consisting of unprotected elements operated under tension. It includes also a drying device allowing producing air with the preset mean humidity content, that is, the so-called, "dry air", designed to feed dry air from the drying device into preset points, each arranged on one of three devices, namely, on the first anchor attachment, second anchor attachment and multiple stay pipes, a ventilation device to force dry air into the pipes from the said multiple dry air feed pipes and test, measurement and control appliances.

EFFECT: antirust protection system not increasing diameter of all operating elements operated under tension and making assembly to be operated under tension, continuous control of aforesaid system.

20 cl, 3 dwg

FIELD: construction.

SUBSTANCE: invention relates to the system of "smart" cable for bridge with the use of built-in sensors based on fibre Bragg gratings (FBG) and can be used in cable load-bearing structures of cable, suspension, arched and other types of bridges. System comprises anchor glass, plate for separating wires, connecting clutches, sensor based on fibre diffraction grating and cable itself. Sensor based on fibre diffraction grating comprises strain gauge 9 with fibre diffraction grating and temperature sensor with fibre diffraction grating. The ends of optical fibres of strain gauge 9 and temperature sensor are led outwards. Assembled strain gauge 9 is rigidly connected with the steel wire in the connection coupling. Assembled temperature sensor is suspended on the steel wire in the connection coupling. Openings are punched in the plate to separate wires. Protective steel tube is dipped in advance in the front part into the connecting sleeve and anchor glass.

EFFECT: system improves survival of sensors and optic fibre during manufacture and operation of cable, provides reliable sealing of sensors and permits to transmit signals effectively and accurately from fibre diffraction gratings outward from cable.

11 dwg

FIELD: protection devices.

SUBSTANCE: passive method for protecting taut cables from vibrations comprising the perpendicularly attachment of a device comprising a unilateral spring or a shape memory alloy wire to a taut cable at an attachment position, wherein the device (especially the unilateral spring of the shape memory alloy wire of the device) acts on the taut cable only when vibrating taut cable exceeds a switch position (SP), device for protecting a taut cable from vibrations, as well as the use of such a device in a construction.

EFFECT: disclosed is a passive method for protecting taut cables from vibrations.

18 cl, 16 dwg

Stay cable // 2618307

FIELD: construction.

SUBSTANCE: invention relates to the field of bridge construction, namely to devices for protection of stay cable anchors of bridges from vibration. Byte bridge comprises pylon 1, road cover 2, stay cables 3. Stay cable 3 of bridge includes arranged in protective case 4 bundled bars 5, nodes of connection 6, 7 of bundled bars respectively, with pylon 1 and road cover 2, deviators 8, 9 located near nodes of connection each of which contains fixed on bundled bars clip 10, and located in the plane perpendicular to the longitudinal axis 11 of bundled bars, and sealed with forming clamp 10 of thrust 12 and 13, and also damping device 14, consisting of movable 15 and stationary 16 elements, between which there is an elastic vibration-absorbing plate 17. Thrusts 12, 13 by means of hinges 18, 19 are connected with moving 15 element of damping device of the corresponding deviator at an angle of α to longitudinal axis 20 of moving element. Device has a hardness regulator, regulating the pressure between a movable and stationary elements of vibration to the antivibration elastic plate 17, which is made in form of regulating bolts 21. Anchor nodes of the connection of the bundled bars, respectively, with the pylon and road cover consists of base plate 22, anchor holder 23, in which there are wedge clamps 24. Before and during the operation of the stay cable bridge, each of the stay cable deviators are set up by means of hardness regulator on the optimum frequency of vibration dampening of the bundled bars. At vibration of bundled bars vibration through forming clamp is transmitted to thrusts 12, 13 and then by means of hinges 18, 19 to moving 15 element. Since thrusts 12, 13 by means of hinges 18, 19 are connected at an angle of α to longitudinal axis 20 of movable 15 element, forces occurring at hinges and directed perpendicular to the longitudinal axis 20 of the movable 15 element are oriented in opposite directions and can be dampened. In view of the fact that forces acting in the plane perpendicular to the longitudinal axis of the bundled bars are not transmitted to the wedge clamps of anchor node, the reliability of their work increases.

EFFECT: this technical solution will facilitate the installation, maintenance and adjustment of a damping device for the effective damping of stay cable oscillations, and to increase the operational reliability, maintainability and durability of stay cable.

4 cl, 5 dwg

FIELD: measurement technology; electric-power industry; geological prospecting; aircraft industry.

SUBSTANCE: device can be used for inspecting deformations in big structures, for measuring temperature modes of transformers and temperature distributions along wells and for checking structural deformations in flying vehicles. Device has comparator, pulse former and pulse sampling unit for selecting optical pulses after they were reflected from reference point. As reference points the optical connectors are used mounted among sections of fiber-optic cable, which is used as measuring transformer. Selected pulses run auto-oscillating mode through positive feedback circuit. Oscillation repetition period defines delay in propagation of optical signal to selected reference point. Changes in temperature and influence of mechanical stresses resulting to deformation of optical fiber change refraction factor of material of optical fiber core. Due to change in refraction factor the delay of optical signal changes. Value of temperature or value of deformation acting on any section of measuring transformer are determined by change in delay of optical signals from any reference point.

EFFECT: simplified design; improved precision; widened dynamic range of operation.

2 dwg

FIELD: measurement technology.

SUBSTANCE: sensor has tactile part and image forming aid. Tactile part of sensor has transparent flexible case and many groups of markers disposed inside flexible case. Any group of markers is made of many dyed markers. Markers composing different groups have different color in any group. Behavior of dyed markers is photographed by means of image forming aid in case when object touches flexible case. Different groups of markers preferably have different spatial disposition. Measurement is carried out by means of multi-channel reading-out which uses color or optical spectrum for tactile optical sensor to get info for many degrees of freedom at any point on surface.

EFFECT: improved precision of measurement.

33 cl, 21 dwg

FIELD: measuring technique.

SUBSTANCE: deformation measuring aid has at least one light guide for supplying light from wide band light source or at least from one narrow band light source to case and removal of light away from case to optical signal reception and processing unit. Case of detector is capable of resilient twisting. There is light polarization aid in case and/or outside case. At least one end of light guide is disposed in case. It forms at least one light radiator, supplied to case, and at least one light receiver for removal light away from case. There is polarizer in case, which polarizer is disposed in series behind radiator and receiver and is motionless connected with case. Plane of polarization of polarizer is oriented at angle to plane of light polarization. There is mirror behind polarizer. Optical signal receiving and processing unit provides procession of light reflected from mirror, and measurement of deformation of twist. Selective light reflector is disposed between end of light guide and polarizer. Selective light reflector is motionless connected with case to provide reflection of second part of wide band light spectrum or second part of light spectrum from second narrow band light source, differing from first part of wide band light spectrum or from first part of narrow band first light source reflected by mirror. Longitudinal-lateral deformation and/or vertical deformation (compression-extension deformations), twist deformations and/or curve deformations can be measured simultaneously.

EFFECT: widened functional abilities of deformation detector; simplified process of manufacture; improved reliability of detector.

44 cl, 4 dwg

Up!