The foundation for the turbine unit

 

(57) Abstract:

The invention relates to the construction, namely the construction of foundations for the turbines. The technical result consists in increasing the efficiency of regulation of the resonance frequency of elements of Foundation in the process of operation and reduced material consumption. The Foundation for the turbine unit includes a bottom plate and an upper structure, consisting of transverse girders, stringers and struts, and the elements of the upper structure of the Foundation operates with a continuous through transverse holes and provide wedging load devices with the ability to change the stress state of the elements. Riving load device fitted inside the through transverse holes and actuate by means of a power cylinder. 4 Il.

The invention relates to the construction, namely the construction of foundations for turbines and other machines with dynamic loads, and is designed to provide vibration reliability of these foundations.

Known Foundation for the turbine, consisting of transverse beams, longitudinal beams and struts, which are based on the lower PE. 152-156, Fig. 7.9).

A disadvantage of the known construction of the Foundation is that the natural frequency of Foundation blocks cannot be changed without disassembly of the turbine unit and the reconstruction of the basement.

Also known construction of the foundations of the turbine unit, which includes a bottom plate, a rack and crossbars made with cavities filled with concrete. When this cavity crossbars made in the form of grooves placed on their top or bottom surface. To change the resonant frequency of such a Foundation estimated by finding the height of the concrete layer filling one or more cavities of the crossbars (ed. mon N 855131, E 21 D 27/44, 15.08.81)

The lack of such a Foundation is its consumption and low adjustable resonant frequency, because with increasing height of the concrete layer filling the grooves of the beams increases and the mass of the structure. In addition, it is almost impossible to change the natural frequency of the racks. On the other hand, ribs and recesses prevent the installation of embedded parts and equipment turbine plant, and the concreting of the recesses requires stopping the operation of the turbine unit.

Closest to the proposed tehnicheskoy and girders. This rack is made with separate openings to be filled with concrete on an expanding cement, and the supporting elements are mounted on ledges racks for changing the span of the girders (see ed.mon. N 1016431, IPC E 02 D 27/44, 07.05.83)

The disadvantage of this type of Foundation is the low efficiency of the detuning of the resonant frequencies of concrete elements (columns) from the frequency of excitation of oscillations, as it is very difficult to find the optimum parameters of stiffness, thrust and weight depending on the vibrational state of the system turbine-Foundation-base (TFO), which remains stable over time, and depends on the load of the turbine, its technical condition, the level of groundwater in the basement, seal the unit is under the sole Foundation and soil, presmykayuschihsya to the side edges of cracks in the Foundation blocks and many other factors.

In terms of the current production of concrete works ("wet" processes) openings expanding cement to be processed last (execution of notches, clean from dust and cement film and so on), making and fixing formwork, subsequent curing concrete for the period is Econom. All these works are material-intensive, costly and not give a definite answer on the frequency offset their racks from harmonics generated by the turbine.

Another disadvantage of the Foundation by the author. mon. N 1016431 is increased dimensions of cross-sections of racks and benches, which caused the need for the device in the body of the rack openings and installation of racks supporting elements.

At the same time, you know, if the foundations of the turbine are combined beams and girders with a relatively flexible racks, the resonance peaks in the system of the turbine-Foundation-base shift towards low frequencies remote from the operating speed of the unit. This significantly reduces the amplitude of vibrations of beams and girders at the operating frequency of the turbine and improves the vibration of the bottom plate and soil base from dynamic effects that are not observed in the construction adopted by the author. mon. N 1016431.

The purpose of the invention is a more effective regulation of the resonance frequency of elements of Foundation in the process of operation and reduced material consumption.

This objective is achieved in that the Foundation under turboagregata, what you superstructure is made with a through transverse holes and equipped with riving load devices, allows you to change the stress state of the elements, and disjoining load device installed inside the through holes and are driven by means of a power cylinder.

Wedges are used in various industries as a tool and as parts during installation and repair of various equipment (Engel-CZK I. C., installation and maintenance of equipment turbine plants thermal power plants.- M.: Vysshaya SHKOLA, 1985, S. 49, Fig. 10).

In this case, the hallmark of disjoining the load device is an introduction to the composition of new parts - additional wedge elements generated using rolling bodies of different diameters and located on the inclined planes of the main wedge element prismatic shape. By introducing additional wedge elements in the form of rolling elements decrease of the friction force during forward movement of the main wedge element and increases the reliability and efficiency of the whole riving load devices performing raspor (tension) cross-sectional cross-beams, beams or stand Foundation, changing which you can create different

The present invention is schematically depicted in the drawings, where Fig. 1 shows a General view of the Foundation in the amount of Fig. 2 - the node "A" of Fig. 1, in Fig. 3. Sech. 1-1 of Fig. 2, in Fig. 4 - Sich. 2-2 of Fig. 2.

The Foundation includes a bottom plate 1 and the upper structure, consisting of transverse beams 2, the longitudinal beams 3 and the uprights 4. Moreover, the elements of the upper structure is made with a continuous through transverse holes 5, the dimensions of which are set riving load device.

Riving load the device consists of a main wedge element with double-sided pitch prismatic form 6, the working face 7 which is made in the form of inclined planes arranged symmetrically about its longitudinal axis, and two additional wedge elements generated using the set of rolling bodies of different diameters 8, located in the spherical sockets 9 shaped element 10, providing a symmetrically uniform arrangement of the rolling elements 8.

In riving load device external tangents conducted to the rolling elements 8 for more wedge elements must be parallel to the longitudinal axis 11 of the main wedge element 6, is it. As the rolling elements 8 using steel balls or rollers.

Shaped element 10 is mounted between the rails 12, which are attached to the posts 13. The rack 13 is freely attached to the fingers 14 that is to be welded to the fixtures 15 transverse holes 5 concrete elements. Shaped element 10 can freely move in the forward direction and is held in its fixed position by means of elastic elements 16, which on the one hand rest against the vertical wall 17 of the transverse holes 5, and the lugs 18, which are attached to the posts 13. Symmetrically relative to the riving load device is a power cylinder 19 with leads for connection to a pumping station (not shown). The hydraulic cylinder 19 is held in the middle part of the transverse holes 5 with spring-loaded steel structures 20 that are fixed to steel the fixtures 15. The piston of the power cylinder 19 connected through connections 21 with the main wedge elements 6 load devices.

The power cylinder 19 provides synchronous operation of the disjoining load devices.

Collaborative cross-section of the element fundamental the way.

During commissioning or during operation of the system TFO measure the vibration elements of the basement, find their resonant frequency and, if some of them need to change operating conditions of the Foundation or of the turbine, with the help of hydraulic cylinders 19 are driven riving load device corresponding elements of the Foundation. For this purpose, the hydraulic cylinder 19 is connected to the pumping station.

Before turning on the hydraulic cylinder 19 to the selected element of the Foundation set the shock sensor 23, which connect, for example, with the balancing and measuring prior type BEEP-6 (not shown) and includes this device. Then slowly load element of the Foundation, its own frequency which you want to change, various forces (thrust) in the transverse direction using a riving load device. The main wedge element 6 under the action of the pre-selected effort, developed by the piston of the hydraulic cylinder moves in the forward direction between the additional wedge elements formed by the rolling elements of different diameters 8, and the effect of the latter on the top and bottom walls through transverse holes 5 Lemgo element depending on the magnitude of the thrust. This leads to a change in resonance frequency of the selected block that is fixed on the screen and the arrow pointer BEEP-6, where the observed change (decrease) the amplitude of the specified element. As the frequency of natural oscillations with riving load devices was rebuilt from the frequency at which there was an increased vibration, the amplitude of this element is significantly reduced. Thus, during operation of the system TFO is the detuning of the resonant frequencies of the blocks of frequencies excited by the operation of the turbine unit, and the reduction of elevated vibrations individual items by bringing them to regulatory requirements without stopping the operation of the turbine unit.

The execution of the foundations of the turbine unit of the proposed method will reduce its consumption, increase vibration reliability and reduce downtime of the turbine. Comparison of the proposed design of the foundations of the turbine unit with well-known, as well as with the design of the Foundation adopted as a prototype, shows the following.

The proposed design of the base allows in case of high vibrations separate the loading device to provide extensive regulation of its dynamic characteristics and effectively rebuild the natural frequencies of the individual elements from the frequency of the perturbing forces, in which there is resonance oscillations without stopping the operation of the turbine unit.

The Foundation for the turbine, including the bottom plate and the top structure, consisting of transverse girders, stringers and struts, characterized in that the elements of the upper structure of the Foundation is made with a continuous through transverse holes and equipped with riving load devices with the ability to change the stress state of the elements, and disjoining load devices are located inside the through transverse holes and are driven by means of a power cylinder.

 

Same patents:

The invention relates to the construction, and in particular to methods of construction of the heavy vibroisolating foundations and various objects

The invention relates to the processing of metals by pressure, namely design-forging equipment

The invention relates to the construction, namely vibroisolating the foundations for equipment with dynamic loads

The invention relates to the construction and can be used in the design of vibration isolation systems and vibration protection of structures, machines and mechanisms with dynamic or seismic responsibility

Concrete base // 2055119
The invention relates to construction machinery, namely reinforced concrete machine frames and bases

The invention relates to a means of protection against vibration low-frequency horizontal vibrations of foundations for machinery

The invention relates to the construction and relates vibroisolating of foundations for dynamic loads

The invention relates to the construction, and in particular to methods of construction of foundations for equipment

FIELD: construction, particularly new building erection and existent building reconstruction under any engineering-geological circumstances.

SUBSTANCE: foundation structure comprises shallow foundation and reinforcement members. Reinforcement members are made as vertical bars of precast or cast-in-place piles having diameters less than 200 mm and arranged along foundation perimeter. The piles are spaced a distance from outer foundation faces. The distance is equal to 0.1-0.5 of reinforcement member diameter. Distance between neighboring piles is equal to 2-4 reinforcement member diameters and reinforcement member length is 15-20 diameters thereof.

EFFECT: increased load-bearing capacity due to creating compressive operational conditions under different engineering-geological circumstances, increased dynamic rigidity of foundation base and reduced foundation deformation and vibrational amplitude.

9 dwg

FIELD: mechanical engineering, particularly large electrical machines and foundations for turbogenerator and hydraulic generators.

SUBSTANCE: foundation slab comprises stator body base including support part connected with foundation. Arranged between support part and foundation is damping panel including reinforcement formed as vertical rods. Foam plastic member is put on the vertical rods and grouted with concrete grout. Vertical rods are connected one to another in horizontal plane with wire arranged at least in two levels in vertical plane of damping panel. Vertical rods extend through support part, pass into stator body base and into foundation.

EFFECT: reduced dynamic pressure applied to foundation slab and increased structural rigidity.

1 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. The bumper has pendulum suspension means and comprises compression spring cooperating with the base and with the pendulum suspension means. The pendulum suspension means is made as threaded rod connected to spherical washer formed on one end thereof and with threaded bush also attached to spherical washer end not connected with threaded rod. The spherical washers cooperate with not less than 3 balls located on conical surfaces of support members and cooperating with upper spring end and object to be protected against vibration correspondingly. Buffer limiting elastomeric members are installed in base.

EFFECT: increased efficiency of vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. Bumper has resilient member formed as two serially connected elastic resiliently-damping members divided with washer. Pendulum suspension means of the bumper is made as threaded pin having the first end connected to hinged lever and the second end connected to nut and thrust washer, which are connected to bush. The bush is attached to resilient member. The thrust washer is made of resilient material. Resiliently-damping member is formed as pleached strands or tangled wires.

EFFECT: increased efficiency of three-dimensional vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. The bumper has pendulum suspension means made as threaded rod with spherical profile on one rod end and threaded bush also having spherical profile. Both spherical profiles cooperate with conical surfaces of upper and lower plates correspondingly. Resilient member is made as serially connected resilient discs connected with outer bush surface along inner disc diameters. One bush end is fixedly secured to the base, another bush end is slidably installed in guiding bush.

EFFECT: increased efficiency of three-dimensional vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection means for building industry, particularly vibroinulated foundations for machines, engines, or ordnance.

SUBSTANCE: vibroinsulated foundation comprises bath and foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom. The foundation block is higedly connected with bumpers, which in turn are attached to foundation block by means of hinged lever. The lever connects foundation block with support member of bumper. The bumper has pendulum suspension means made as threaded rod with spherical profile on one rod end and threaded bush also having spherical profile. Both spherical profiles cooperate with conical surfaces of upper and lower plates correspondingly. Resilient member is made as serially connected resilient disc means formed as disc springs connected with each other along outer diameters by means of ring having T-shaped profile and along inner diameters by means of ring having inner surface cooperating with outer bush surface. One bush end is fixedly secured to the base, another bush end is slidably installed in guiding bush.

EFFECT: increased efficiency of three-dimensional vibration protection and simplified foundation structure.

2 dwg

FIELD: vibration protection, particularly to erect vibroinsulated foundations for machines and equipment subjected to dynamic loads.

SUBSTANCE: vibroinsulated foundation comprises bath, foundation block arranged in the bath so that the foundation block is spaced from bath walls and bottom and is pivotally connected to vibroinsulators. Each vibroinsulator is attached to foundation block by means of pivoted lever, which connects foundation block with support member of vibroinsulator. Each vibroinsulator has pendulum hanger made as threaded rod with spherical profile on one end thereof and comprises threaded bush fastened to the rod and having spherical profile. Both spherical profiles cooperate with conical surfaces of support vibroinsulator member and upper conical bush correspondingly. The resilient member of vibroinsulator is made as a number of serially connected resilient elements secured to bush along outer diameters thereof. The bush is fixedly connected to vibroinsulator base. Inner resilient element diameters are attached to bush, which encloses rod. One bush end abuts the last resilient element, another end cooperates with upper conical bush. Each annular resilient element may be formed as at least two flat resilient coaxial rings, namely inner and outer ones, which are fastened with each other by at least three resilient flat plates or resilient rods having round or polygonal sections. Each annular resilient element may be formed of at least two flat coaxial resilient rings, namely of upper and lower ones, connected with each other by at least three resilient flat plates, which are inclined to ring axes, or resilient rods having round or polygonal sections.

EFFECT: increased efficiency of volumetric vibroinsulation and simplified structure.

3 cl, 5 dwg

FIELD: construction.

SUBSTANCE: invention is related to means of protection against hazardous effect of vibration and may be used in construction, in particular in arrangement of vibration-insulated foundations for machines and equipment with dynamic loads. Foundation on vibroprotective elements comprises bath, foundation unit arranged in it with clearance versus walls and bottom and hingedly joined to vibration isolators installed in bath bottom. Vibration isolators are joined to foundation unit by means of hinged lever, which connects foundation unit to support element of vibration isolator, which comprises elastic element, body and pendulum suspension. Body is arranged in the form of box with lower base and upper plate with hole for threaded pin of pendulum suspension, which are connected to each other by three side ribs, with creation of window for accommodation of support lever, on which vibration-insulated object is arranged. Elastic element is arranged in the form of three serially connected elements: elastic ones and elastic-damping element arranged in between. Elastic elements with one of their bases are installed in bushes, which are fixed accordingly on upper plate of body and cover, and rest against washers with their other bases, and washers are joined with elastic-damping element. Pendulum suspension is arranged in the form of threaded pin, which is connected by one end to support lever for fixation of vibration-insulated object, and by other end - to nut and thrust washer, which is joined to cover attached to elastic element. Elastic-damping element is arranged in the form of steel-wire weaving or metal thread waste.

EFFECT: increased efficiency of spatial vibration insulation and simplified design.

2 dwg

FIELD: construction.

SUBSTANCE: inventions relate to the field of foundation engineering of deep burial for important objects, such as nuclear power plants. Method for erection of nuclear power plant foundation consists in engineering-geological survey with detection of soil foundation layers depth, which complies with depth of active compressing thickness H, its physical-mechanical properties: angle φ of inner friction, c - specific adhesion, γ - density, E0 - module of common deformation, µ0 - coefficient of Poisson, which correspond to design elastic compressing load under deep buried foundation, in erection of mine pit with shape that corresponds to foundation, filling of filled layer of soil onto mine pit bottom and its compaction, erection of curb with reinforcement frame inside and its filling with high grade concrete. Foundation, which is solid in plan, is given convex spherical shape, which is inscribed in plan into configuration of monolithic foundation by radius of circumference, radius of sphere is identified by given dependencies, as well as maximum angle of elastic semi-contact of foundation sphere with soil foundation, pressure of structural tensile strength of foundation, central critical pressure under center of sphere in maximum elastic base. Bottom of mine pit for concave foundation is arranged with response spherical groove.

EFFECT: improved bearing capacity of foundation, improved elastic contact interaction of foundation with underlying soil foundation.

2 cl, 7 dwg

FIELD: construction.

SUBSTANCE: method for erection of foundation under machines consists in deepening of massive reinforced concrete foundation foot of rectangular or prismatic shape in plan into ground base by ≥¼ of its height, but at least 1 m, its hydraulic insulation against hazardous effect of aggressive ground waters and arrangement of centre of gravity of machine and center of gravity of foundation foot area on the same vertical line, at the same time support surface of foundation is accepted as having area calculated according to given dependence. Support surface of foundation, which is rectangular in plan, is arranged with foot of spherical convex shape, at the same time given dependences are used to identify radius, angle of sector of elastic half-contact of sphere with ground, pressure of structural strength of ground for stretching, critical pressure under center of sphere, besides sphere of foundation is deepened. Support spherical surface is prevented against displacements with slippage and against tilting under action of external dynamic load by increasing edge horizontal support part of foundation rectangular in plan, protruding beyond edges of spherical support central surface, or by anchoring foundation to soil by means of piles. Also arrangement of foundation for machines is proposed.

EFFECT: increased bearing capacity, increased service life.

4 cl, 2 ex, 15 dwg

Up!