The method of reinforcement of prestressed structures superstructures
(57) Abstract:Usage: in construction, in particular in the production of tense constructions. The invention consists in the reinforcement of prestressed structures superstructures by the location of the working pre-tensioned reinforcement polygon nodes bend or curved channels in the concrete, and a working pre-tensioned reinforcement feature polygon along the entire length of continuous multi-span beams parallel to the axis of the structure, with channels for reinforcement lay across the length of the beams mounted design and on the joints of the constituent elements of beams establishes connection channels, the ratio of the lengths of the connected elements of the beams forming the beam rifle is 1:(0.2 to 0.5) and the ratio of the beam height to the length of its span is 1:(25-32), respectively. 3 Il. The invention relates to the construction, in particular to pre-tense constructions and can be used for reinforcement of prestressed structures spans, beams, trusses: plates and bridges.There is a method of reinforcement of prestressed structures span the build is in concrete, characterized in that for the purpose of more complete utilization of the strength properties of pre-tensioned reinforcement and increase the strength, hardness and fracture toughness of the whole construction work pre-tensioned reinforcement feature polygon along the entire length of the product parallel to the axis designs arrow of polygonally fmlarger arrows rise building construction fcfderived from the pre-compression, and when multi-row radial location, the angle of inclination of the axis of the center of gravity of the pre-tensioned reinforcement to the axis of the structure is determined from the condition
< / BR>where Mxestimated time of full load,
Rscalculated resistance pre-tensioned reinforcement,
Zpthe internal shoulder of the pair of forces, as defined by applicable rules,
fcfconstruction the construction hoist from compression as defined by applicable rules,
lothe estimated length of construction
Acpthe area of pre-tensioned reinforcement.(see ed.mon. USSR N 1399434, class E 04 G 21/12, 1988).The main disadvantage of this method is not sufficiently high strength, stiffness and fracture toughness of the structure.The technical result achieved by the proposed sposobnosti the formation of multi-span continuous beams.This result is achieved by way of reinforcement of prestressed structures superstructures by the location of the working pre-tensioned reinforcement polygon nodes bend or curved channels in the concrete, in which a working pre-tensioned reinforcement feature polygon along the entire length of continuous multi-span beams in accordance with the curve of bending moments, while the channels for reinforcement lay across the length of the beams mounted design and on the joints of the constituent elements of beams establishes connection channels, and the ratio of the lengths of the connected elements-beams, forming a continuous beam is 1:(0.2 to 0.5) and the ratio of the beam height to the length of its span is 1:(25-32), respectively.In Fig. 1 shows the design of multi-span continuous structure; Fig. 2 is a top view.Example. Continuous span structure with a number of span n, shown at 1, is formed of the n beams along the length of the superstructure, and in cross section the number of beams is determined by the size of the roadway (Fig. 1).Typical prestressed beams 1 length 33 mm installation combined with precast prestressed nanoporosity is carried out using a beam 4 of a high-strength reinforcement, placed in left for these purposes, the channels in beams 1 and nadvornik blocks 2. After monomachine longitudinal seams on the stove collected beams made of prestress nadvornik plots beams 5. The result is prestressed along the entire length of the superstructure n x L, mounted beams from the factory.In Fig. 3 shows a cross-section of the beam continuous beam structure.The finished bearings are mounted on the supporting part of the prestressed units 2.Between the 2 blocks in length are mounted with specially prepared by the ends of the beams 1 of the superstructure with the installation of temporary supports or suspended by means of auxiliary devices Nagornyi blocks.In the available channels nadvornik blocks and beams through the intersection of monomachine pave the beams 4 of the high-strength wire for compression joints.Concreted butt monomachine.After curing the concrete monomachine is the tension beams 4 and 5 in the junction of monomachine and compression of the concrete around the section.Is injectiona channels installed on the mounting beams.The plant beams of manufacturing the manufacture of the beam on the bench technology. The beam 4 (Fig.1) is inserted into the channel 6 on the installation, and the stress is made on the concrete (Fig.1).Example 2. Special training ends of the beams consists of the following operations:
the ends of the connected elements 1 and 2 are identical in cross-section, number of channels, the length of the released armature, treatment of concrete surfaces;
in the area of joints connected beams are arranged temporary supports,the ends of which rest the ends of the elements 1 and 2;
connect the ends of the armature, combine channels 1 and 2 and produce monomachine (concreting);
after a set of concrete strength required is pulled through the channel beams pageboy valve 4 and fixed to project efforts to provide objetos design along the entire length of the continuous (solid) beams;
near the end of the beam 1 and item 2 in the upper zone, while the concrete beams are left niches, in which are placed the anchor fixing and tensioning jacks for tension beams 4 and 5.The ratio of the length of connected elements-beams, forming a continuous beam is 1:(0.2 to 0.5), respectively. This is necessary for the rational allocation of the valve section of the beam throughout its length and a more optimal estwenno. This is necessary to ensure reliable rigidity in the operation of the structure.Reinforcement of prestressed structures superstructures in accordance with the method provides high reliability and rigidity, and reduced by 8-12% metal consumption per 1 square meters of construction, which significantly increases the efficiency of the proposed technology. The method of reinforcement of prestressed structures superstructures by the location of the working pre-tensioned reinforcement polygon nodes bend or curved channels in concrete, characterized in that the working pre-tensioned reinforcement feature polygon along the entire length of continuous multi-span beams parallel to the axis of the structure, with channels for reinforcement lay across the length of the beams mounted design and on the joints of the constituent elements of beams establishes connection channels, and the ratio of the lengths of the connected elements-beams, forming a continuous beam 1 is 0.2 to 0.5 and the ratio of the height of the beam and the length of its span is 1 25 32 respectively.
FIELD: apparatuses for fastening reinforcing parts, for example mutually crossed reinforcing rods.
SUBSTANCE: drum around which wire for fastening reinforcing rods is wound is mounted in shaft arranged in housing. Annular recess is formed along edge of opening of housing. Diameter of said recess exceeds that of lower part of housing. At side of opening of housing drum has flange arranged in said annular recess. On inner peripheral surface of opening of drum boss there is dent for preventing drum separation from its mounting shaft. On outer edge surface of shaft there is mounting recess for engaging dent.
EFFECT: improved design preventing wire penetration into gap between housing and drum, enhanced operational reliability of drum and machine for binding reinforcing rods.
4 cl, 27 dwg
FIELD: preparing, conveying, or working-up building materials or building elements in situ, mounting and prestressing of reinforcing inserts.
SUBSTANCE: reinforcing bar binder feeds wire while rotating a wire reel installed in chamber and binds reinforcing bars. The chamber comprises the first detecting means to detect wire reel rotation and the second detecting means to detect number of second wire reel parts to be detected during reel rotation by the first detecting means. Binder body is provided with control means to control the amount of fed wire or wire torque depending on the number of second parts detected by the second detecting means.
EFFECT: increased structural simplicity and provision of automatic regulation of fed wire amount and torque thereof.
12 cl, 19 dwg
FIELD: equipment designed for fastening reinforcement by means of wire, for example for fastening mutually crossing reinforcing rods, possibly in building.
SUBSTANCE: machine includes housing; rotating drum carrying wire for fastening reinforcing rods; unit for controlling drum rotation; one or more detected objects. Detected object may be placed on lateral surface of drum. At controlling rotation of drum, said object is detected through opening of lid providing light reflection from light irradiator. Light reflected from detected object and light reflected from lid is received for determining difference between their intensity values.
EFFECT: enhanced operational reliability of machine, elimination of errors at monitoring wire consumption.
12 cl, 40 dwg
SUBSTANCE: armature guy is carried out at first in angular cells on construction contour, then in central cell, after in cells adjoining to central cell on all central axis across construction, then on cells of layer adjoining to central layer of cells in direction to external contour and at the end cells located on construction perimeter. In angular cells an armature guy is made in spans between a corner pillar and the first from it in two axes on construction location. In cells adjoining to central cell, on all central axis a guy is made on longitudinal spans on construction location, on cells of a layer adjoining to central layer of cells, guy is made in two mutually perpendicular spans, beginning from central axes concerning central cell, thus guy on different parts is carried out by different devices.
EFFECT: increase of load-carrying capacity of construction floorings and reliability of devices for armature guy.
7 cl, 8 dwg, 1 ex
SUBSTANCE: invention is attributed to construction engineering and can be used for binding of reinforcement cages of concrete products. Reinforcement hook contains shaft on one end of which handle is installed which can be rotated, and the second end of the shaft is tapered and bended as hook. Lever is hinged on the handle. The lever is capable to change position relative to handle. Two more levers are installed on shaft of reinforcement hook which levers can travel along hook and relative to each other and they are interconnected by elastic element. As a result due to simple fastening elements using, binding with wire pieces without loop is provided and production is cheapened.
EFFECT: cheapening of construction.
FIELD: construction industry.
SUBSTANCE: mechanism is intended for attaching extended elements to each other, and especially such elements as reinforced bars and electric cables by means of at least one wire. Mechanism consists of two jaws (6, 7) moved down on the elements to be connected (8). There are provisions made for means (20) of supplying wire (12) along guide surface (10) of the first jaw (6) to guide surface of (11) the second jaw (7), thus forming a wire loop which envelopes the above elements on three sides, and in this case ends of this loop can be twisted on the fourth side of elements (8). Twisting means consist of device (14) rotating relative to jaws (6, 7) and guiding the wire (12) at its supply to jaw and removal from jaw.
EFFECT: providing possibility of wire straightening with overcoming the resistance by the value required for twisting the wire loop ends.
25 cl,13 dwg
FIELD: engines and pumps.
SUBSTANCE: reinforcing bar wire-tying machine incorporates wire drum with data detection and wire identification device designed to detect and identify wire on the drum flange side surface and allows wire twist force or feed amount control proceeding from the wire identification data detected in starting wire-tying with the help of the rotation detection lever. The drum comprises cylindrical bush with a pair of flanges on its sides and has an extending section on the outer side surface with a reflecting symbol on the bush outer side surface. The type of wire coiled around the said drum is determined from the number of disclosed reflecting symbols when the detection signal is input from the aforesaid lever. The wire data is detected at the drum high-rotation wire-tying speed, not in coiling the wire on the drum.
EFFECT: reliable wire-type data detection.
21 cl, 9 dwg
SUBSTANCE: method includes use of a piece of the wire as fastening element which part is bent with formation of the lug for grasp with reinforcement cage, fastening element supply under flooring of reinforcing bars, lug grasp with reinforcement cage, throwing of fastening element through it from condition of an arrangement of flooring of reinforcing bars in wire loop and a tightening of a loop several turns of the reinforcement cage at deduction of a tail of the fastening element. For this purpose use the manual delivery unit; the container with a holder for placing of the fastening elements is established in its case, submitting gear and a clip. The manual delivery unit is brought to flooring of reinforcing bars, the fastening element is taken from the container, and the fastening element supply under flooring of reinforcing bars is carried out by its telescopings by means of the delivery unit. Holding of a tail of the fastening element at tightening of a loop by turns of the reinforcement cage is performed by means of a clip of the mentioned device which sizes allow to carry out joining in close places.
EFFECT: labour productivity increases.
FIELD: construction industry.
SUBSTANCE: reinforcing bars of reinforced concrete structures are set into place and attached manually with a reinforcing hook using fasteners. A piece of wire is used as fastener, and some part thereof is bent into halves so that a closed or open loop with a tail piece can be formed of one or two wire strands. Reinforcing hook is equipped with a lock that allows maintaining the fastener's tail piece.
EFFECT: invention allows improving labour capacity when attaching bars by means of reinforcing hook.
FIELD: mechanical engineering.
SUBSTANCE: invention refers to mechanical engineering and can be used in machine for reinforcement material binding with wire. The reel is fitted with reel rotation control sensor. The reel has two flanges, inner cylinder area where reel mounting shaft is inserted, and outer cylinder area around which wire is spooled. Between inner and outer cylinder area there are multiple objects with quantitatively differing physical characteristics which objects are detected by reel rotation control sensor.
EFFECT: reliable wire consumption detection is provided.
4 cl, 40 dwg