CN110565546A - Detachable device for assembling prestress for bridge structure and reinforcing method - Google Patents
Detachable device for assembling prestress for bridge structure and reinforcing method Download PDFInfo
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- CN110565546A CN110565546A CN201910846025.6A CN201910846025A CN110565546A CN 110565546 A CN110565546 A CN 110565546A CN 201910846025 A CN201910846025 A CN 201910846025A CN 110565546 A CN110565546 A CN 110565546A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 15
- 238000004873 anchoring Methods 0.000 claims abstract description 95
- 210000002435 tendon Anatomy 0.000 claims abstract description 87
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 238000013461 design Methods 0.000 claims abstract description 9
- 238000012546 transfer Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 63
- 239000010959 steel Substances 0.000 claims description 63
- 230000005540 biological transmission Effects 0.000 claims description 40
- 238000009434 installation Methods 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 238000004064 recycling Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Abstract
the invention discloses a detachable device and a reinforcing method for assembling prestress for a bridge structure, wherein the detachable device comprises a pushing device, an anchoring device, a beam bottom anchoring pedestal and a prestressed tendon; the pushing device comprises a rack and a pushing beam arranged on the rack, and the pushing beam is connected with a tensioning driving mechanism for driving the pushing beam to horizontally slide; the prestressed tendon penetrates through the pushing device and applies the longitudinal tensile force of the pushing beam to the prestressed tendon through the anchoring device; the anchoring device is connected with the beam bottom anchoring pedestal to transfer the prestress of the prestressed tendon. The design can realize synchronous tensioning of a plurality of prestressed tendons and improve the working efficiency by splicing the assembled trusses in a specific number; the tensioning process can be finished in advance in a factory, and can also be assembled on site for anchoring, so that the problems that a large jack is used for on-site tensioning and the tensioning precision is difficult to guarantee can be solved; after the anchoring is finished, all devices except the prestressed tendons are removed for recycling, so that the construction cost can be saved.
Description
Technical Field
the invention relates to the field of bridge structure maintenance, in particular to a detachable device and a reinforcing method for assembling prestress for a bridge structure.
Background
At present, existing bridge structures are in long-term service process, and harmful ion in the environment enters into the inside reinforcing bar corrosion that arouses of concrete through the protective layer, and this type of disease takes place more easily for the structure of band gap work, and this can make the reinforcing bar sectional area reduce, and the bonding property of reinforcing bar and concrete descends, and structure bearing capacity is not enough. Especially for the prestressed concrete structure, the corrosion of the prestressed tendons can cause insufficient prestress storage inside the structure, the structure safety is influenced, and the failure risk is increased. In order to improve the bearing capacity of the existing bridge structure, the prior commonly used reinforcing method comprises the following steps: cross section enlarging method, steel plate or high-strength composite material pasting, external prestressing method and the like.
among them, the external prestressing method, such as prestressed carbon fiber reinforced Composite (CFRP), prestressed high-strength steel wire rope, and fabricated prestressed truss, is one of the more effective methods for reinforcing existing bridge structures because of its advantages of providing prestressing force, and easy replacement of old prestressed tendons. Meanwhile, a construction platform needs to be arranged at the bottom of the bridge when external prestress is applied, and machines such as a large jack need to be used in the tensioning and anchoring process, so that a large operation space is needed, and the condition that the beam bottom space is limited in the existing bridge reinforcing process is difficult; the traditional tensioning method is difficult to ensure the tensioning precision of the prestressed tendon and is very inconvenient in construction; in addition, if the beam bottom needs to be tensioned in batches when a plurality of external prestressed tendons are arranged, the engineering efficiency is low.
disclosure of Invention
The present invention aims to solve the above technical problem at least to some extent. Therefore, the invention provides a detachable device for assembling prestress for a bridge structure and a bridge reinforcing method.
The technical scheme adopted by the invention for solving the technical problems is as follows: a detachable device for assembling prestress for a bridge structure comprises a pushing device, an anchoring device, a beam bottom anchoring pedestal and a prestressed tendon; the pushing device comprises a rack and a pushing beam arranged on the rack, and the pushing beam is connected with a tensioning driving mechanism for driving the pushing beam to horizontally slide; the prestressed tendon penetrates through the pushing device and applies the longitudinal tensile force of the pushing beam to the prestressed tendon through the anchoring device; the anchoring device is connected with the beam bottom anchoring pedestal to transfer the prestress of the prestressed tendon; the beam bottom anchoring pedestal is used for being connected with a bridge.
The pushing device comprises a pushing device, a pushing beam and assembled trusses, wherein the pushing device is arranged on the two sides of the pushing device in the sliding direction of the pushing beam; the pushing beam is connected with the assembly type truss so as to transfer the tension force in the longitudinal bridge direction; the anchoring device connects the prestressed tendons with the assembled truss so as to transfer the tension force in the longitudinal bridge direction.
Furthermore, the two ends of the prestressed tendon extend out of the assembled truss and are connected with the assembled truss through the anchoring device.
Further, the pushing beams are arranged at the upper end and the lower end of the pushing device, two pushing beams are respectively arranged at the upper end and the lower end, and the back ends of the two pushing beams at the upper end and the lower end are respectively fixedly connected with the assembly type trusses at the two sides.
furthermore, the pushing beams are provided with a row of convex teeth arranged along the sliding direction of the pushing beams, the tensioning driving mechanism comprises four transmission gears and a driving gear, the four transmission gears are respectively meshed with the convex teeth of the four pushing beams at the upper end and the lower end, the four transmission gears are distributed in a rectangular shape and are mutually meshed, and one transmission gear is meshed with the driving gear; the driving gear is connected with a power device to obtain power.
further, still include gear stop device, gear stop device is used for controlling drive gear rotation.
Further, the anchoring device comprises an anchoring base plate, an anchorage device, a screw rod, a steel plate with a groove and a nut; the anchoring base plate is fixedly connected with the beam bottom anchoring pedestal, the prestressed tendons extend outwards to sequentially penetrate through the steel plate with the grooves and the anchoring base plate, and an anchorage device is arranged on the outer side of the anchoring base plate and anchors the end parts of the prestressed tendons through wedge-shaped pieces; the steel plate with the groove and the anchoring base plate are arranged at intervals and connected through the screw rods and the nuts, the nuts are arranged between the steel plate with the groove and the anchoring base plate, one screw rod is correspondingly provided with two nuts, the two nuts respectively abut against the steel plate with the groove and the anchoring base plate, and the steel plate with the groove is fixedly connected with the assembly type truss.
further, the steel plate with the groove is provided with a U-shaped groove with an upward opening.
Furthermore, overhanging steel plates extend outwards from the back side of the assembly type truss on the two sides, and the overhanging steel plates are fixedly connected with the steel plates with the grooves through bolts.
Furthermore, the gear limiting device comprises a left limiting block, a right limiting block and a pressure-bearing limiting block inserted between the left limiting block and the right limiting block, wherein the outer sides of the left limiting block and the right limiting block are respectively provided with a latch capable of being meshed with the two transmission gears, and the left limiting block and the right limiting block are hinged and can clamp the pressure-bearing limiting block in the middle under the driving of the transmission gears.
The invention also provides a reinforcing method for assembling prestress for the bridge structure, which comprises the following steps:
S1, connecting the fabricated truss with the pushing beam; s2, mounting the prestressed tendons on the assembled truss and the pushing device in a penetrating manner, and mounting an anchoring device to connect the prestressed tendons with the assembled truss so as to transfer axial tension; s3, driving the pushing beam to slide outwards, pulling the prestressed tendon to the designed elongation, and then axially fixing the pushing beam to prevent the pushing beam from retracting; s4, mounting a beam bottom anchoring pedestal at the bottom of the bridge according to the design position of the prestressed tendons, and then connecting and fixing the anchoring device and the beam bottom anchoring pedestal one by one; and S5, removing the axial fixation of the pushing beam to enable the pushing beam to freely slide, and applying the prestress to the bridge structure by the prestressed tendons.
The invention has the beneficial effects that: the tensioning process can be finished in advance in a factory, and can also be assembled on site for anchoring, so that the trouble caused by using a large jack on site can be avoided; the prestress application is realized by driving the pushing beam to slide outwards through the tensioning driving mechanism, the prestress can be controlled according to the sliding stroke, and the problem of difficult tensioning precision control can be solved; the tensioning driving mechanism drives the pushing beam to slide outwards through the transmission of a mechanical gear set, and the large gear set and the small gear set can achieve the labor-saving effect; the multiple prestressed tendons are connected with the beam bottom anchoring pedestal through the anchoring device according to design requirements, and the pushing beam is pushed to stretch the multiple prestressed tendons simultaneously, so that the working efficiency can be improved; after the anchoring is finished, except the prestressed tendons, other devices can be detached and reused, and the construction cost can be saved.
drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of the present invention in a state of being connected to a bridge;
FIG. 2 is a schematic view of the pushing device and the assembled truss in an exploded state;
3 FIG. 33 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 at 3 A 3- 3 A 3 of 3 FIG. 32 3; 3
FIG. 4 is a schematic structural view of the gear limiting device in an acting state;
fig. 5 is a structural schematic diagram of the gear limiting device in an exploded state.
FIG. 6 is a schematic view of a connection structure of a beam bottom anchoring pedestal and a bridge;
FIG. 7 is a view of the beam bottom anchoring pedestal in the lateral arrangement;
FIG. 8 is a front cross-sectional view of the anchoring device;
FIG. 9 is an isometric view of an anchoring device;
FIG. 10 is a schematic structural view of a grooved steel plate;
FIG. 11 is a front view of the fabricated truss;
FIG. 12 is a cross-sectional view taken at B-B of FIG. 11;
FIG. 13 is a cross-sectional view of the erected tendon;
Fig. 14 is a construction view for anchoring a bridge tendon.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 14, the detachable device for assembling prestress for a bridge structure of the invention comprises a pushing device 1, an assembled truss 2, an anchoring device 3, a beam bottom anchoring pedestal 4 and a prestressed tendon 5.
The pushing device 1 comprises a rack and a pushing beam 11 arranged on the rack, and the pushing beam 11 is connected with a tension driving mechanism for driving the pushing beam to horizontally slide; the assembled truss 2 is arranged on two sides of the pushing device 1 along the sliding direction of the pushing beam 11; the pushing beam 11 is connected with the assembly type truss 2 to transmit tensile force. Preferably, as shown in fig. 2, the pushing beams 11 are arranged at the upper end and the lower end of the pushing device 1 (rack), the pushing beams 11 at the upper end and the lower end are symmetrically arranged along a central horizontal line, in this embodiment, two pushing beams 11 are respectively symmetrically arranged along a vertical central line at the upper end and the lower end, the back ends of the two pushing beams 11 at the upper end and the lower end are respectively fixedly connected with the upper end and the lower end of the assembled truss 2 at two sides (preferably, fixedly connected through bolts), and the two pushing beams 11 horizontally slide outwards to push the assembled truss 2 to move.
As shown in fig. 2 to fig. 3, the top and bottom ends of the pushing device 1 are provided with guide rails 12, the pushing beam 11 is slidably mounted on the guide rails 12 and can slide along the guide rails 12, and the opposite surfaces of the top and bottom guide rails 12 are provided with sliding grooves for the pushing beam 11 to slide longitudinally and laterally, that is, the sliding grooves are arranged on the bottom surface of the top guide rail 12 and the top surface of the bottom guide rail 12. The guide rail 12 and the two perforated thick steel plates 16 are welded into a whole, and the two perforated thick steel plates 16 are transversely separated and connected by a small truss sheet to form a rack of the pushing device 1.
The driving mode of the pushing beam 11 is preferred, the pushing beam 11 is provided with a row of convex teeth 111 arranged along the sliding direction of the pushing beam, the tensioning driving mechanism comprises four transmission gears 13 and a driving gear 17, the four transmission gears 13 are respectively meshed with the convex teeth 111 of the four pushing beams 11 at the upper end and the lower end correspondingly, the four transmission gears 13 are distributed in a rectangular shape and are mutually meshed, and one transmission gear 13 is meshed with the driving gear 17; as shown in fig. 2, the convex teeth 111 are disposed on the opposite surfaces of the top and bottom pushing beams 11, four transmission gears 13 are disposed between the two pushing beams 11 and respectively engaged with the two pushing beams, and each transmission gear 13 is engaged with two adjacent transmission gears. In order to realize multipoint uniform tensioning, in other embodiments, multiple groups of the pushing beams 11 and the tensioning driving mechanisms may be arranged in the transverse bridge direction (the left and right directions in the viewing angles of fig. 7 and 13).
the driving gear 17 is connected with a power device to obtain power. The power device is preferably a winch which drives the driving gear 17 to rotate. The gears are all mounted on the pushing device 1, specifically, as shown in fig. 3, the positions of the central shafts 131 corresponding to the gears pass through the pre-reserved hole channels of the perforated thick steel plate 16, the gears are correspondingly mounted on the corresponding central shafts 131, and in order to reduce the rotating friction force of the gears, bearings are embedded between the gears and the central shafts 131. The diameter of the driving gear 17 is smaller than that of the transmission gear 13, and because of the difference of the force arm of the gear set, the motion path of the pinion (the driving gear 17) is long, the force applied to the pinion (the driving gear 17) is small, so that the tension force is greatly saved, and the stretching elongation can be accurately controlled by the rotating angle of the pinion (the driving gear 17).
in order to prevent the prestress from being subjected to retraction loss after being tensioned to a certain degree, the design is further provided with a gear limiting device 15, the gear limiting device 15 is used for controlling the transmission gear 13 to rotate, in the embodiment, the transmission gear 13 is controlled to rotate, and when the gear limiting device 15 acts, the transmission gear 13 is clamped to be incapable of rotating, so that the transmission gear 13 is prevented from rotating. Of course, in other embodiments, the gear position limiter 15 can control the rotation of the transmission gear 13 by controlling the rotation of the driving gear 17.
The specific structure of the gear limiting device 15 is preferably that, the gear limiting device 15 includes a left limiting block 151, a right limiting block 152, and a pressure-bearing limiting block 153 inserted between the left limiting block 151 and the right limiting block 152. The outer sides of the left limiting block 151 and the right limiting block 152 are respectively provided with a latch which can be meshed with the two transmission gears 13, and the left limiting block 151 and the right limiting block 152 are hinged and can clamp the pressure-bearing limiting block 153 in the middle under the driving of the transmission gears 13. Specifically, the outer side surfaces of the bottoms of the left limiting block 151 and the right limiting block 152 are inclined planes which incline downwards in opposite directions, the left limiting block 151 and the right limiting block 152 are embedded between the tops of the two transmission gears 13, and when the left limiting block 151 and the right limiting block 152 retract, the transmission gears 13 drive the gear limiting devices 15 to downwards extrude into the gap between the two transmission gears 13 and push the left limiting block 151 and the right limiting block 152 to close up to clamp the pressure-bearing limiting block 153, but the transmission gears 13 are blocked due to the effect of the pressure-bearing limiting block 153. Specifically, the bottom of the left limiting block 151 is provided with an engaging groove 1512, the bottom of the right limiting block 152 is provided with an engaging portion 1522 matched with the engaging groove 1512, and the engaging portion 1522 is engaged in the engaging groove 1512 and is provided with a bolt in a penetrating manner to realize hinge joint. The upper ends of the left limiting block 151 and the right limiting block 152 are respectively provided with a first limiting portion 1511 and a second limiting portion 1521 in an opposite extending manner, the first limiting portion 1511 and the second limiting portion 1521 are used for wrapping the upper end of the pressure-bearing limiting block 153, and the first limiting portion 1511 and the second limiting portion 1521 are arranged along the axis of the rotating shaft in a staggered manner so as to avoid interference. As shown in fig. 4 and 5, a thin steel plate 154 is embedded in the middle of the pressure-bearing limiting block 153, the pressure-bearing limiting block 153 is divided into two halves, the pressure-bearing limiting block 153 is preferably made of rubber, the pressure-bearing limiting block 153 and the thin steel plate 154 are bonded and connected into a whole, and the strength of the rubber block (the pressure-bearing limiting block 153) is ensured by the thin steel plate 154. In other embodiments, the gear limiting device 15 may have other structures as long as the rotation of the transmission gear 13 is prevented from causing the retraction of the pushing beam 11.
when the tension is in place, the gear limiting devices 15 are clamped into tooth grooves of the transmission gears 13 to stop the rotation of the gears, and preferably, two gear limiting devices 15 are arranged to correspondingly limit two pairs of transmission gears 13.
The prestressed tendons 5 penetrate through the pushing device 1 and the assembled truss 2, and the prestressed tendons 5 apply tension force (sliding thrust force) in the longitudinal bridge direction of the pushing beam 11 to the prestressed tendons 5 through the anchoring device 3; the tendon 5 is preferably wrapped with a PVC sleeve, leaving an anchoring length of about 10cm at both ends. Anchoring device 3 is connected prestressing tendons 5 and assembled truss 2 with the tensile force of transmission longitudinal bridge to for the axial thrust that pushes away roof beam 11 is used in prestressing tendons 5, and anchoring device 3 carries out the spacing fixed of axial (prestressing tendons 5's axis direction) to prestressing tendons 5, and assembled truss 2 then only needs outer end and anchoring device 3 to offset can realize the transmission of the tensile force of longitudinal bridge to, and need not complete axial fixed connection.
The anchoring device 3 is connected to the beam bottom anchoring block 4 to transmit the prestress of the tendon 5. Preferably, for convenient anchor 3 installation, also be convenient for constructor has this detachable prestressing force reinforcing apparatus of space installation, 5 both ends of prestressing tendons extend assembled truss 2 and both ends pass through anchor 3 and are connected with assembled truss 2, and prestressing tendons 5 stretches out assembled truss 2 for construction position space is spacious, the constructor operation of being convenient for.
The beam bottom anchoring pedestal 4 is used for being connected with the bridge, and is concrete, and the beam bottom anchoring pedestal 4 comprises horizontal steel plate 41 and U-shaped steel plate 42, and the U-shaped steel plate opening sets up the top downwards and is connected with horizontal steel plate 41, and U-shaped steel plate upper end and horizontal steel plate 41 are provided with corresponding mounting hole, pack into the mounting hole through the steel nail that excels in and fix beam bottom anchoring pedestal 4 in 6 bottoms of bridge.
a preferred construction of the anchoring device is described below with reference to figures 8 to 10.
The anchoring device 3 comprises an anchoring backing plate 31, an anchorage device 32, a screw 34, a steel plate 35 with a groove and a nut 36; the anchor backing plate 31 and the beam bottom anchor pedestal 4 are fixedly connected, preferably, the anchor backing plate 31 and the beam bottom anchor pedestal 4 are provided with corresponding bolt holes so as to be fixed through bolt connection, the bolt holes of the beam bottom anchor pedestal 4 are arranged on two side plates of the U-shaped steel plate 42, and the two sides of the anchor backing plate 31 are correspondingly provided with two side plates so as to be provided with corresponding bolt holes. The prestressed tendons 5 extend outwards and sequentially penetrate through the steel plate 35 with the groove and the anchoring backing plate 31, and the anchoring backing plate 31 is further away from the pushing device 1 relative to the steel plate 35 with the groove. An anchorage device 32 is arranged on the outer side (the side departing from the pushing device 1) of the anchoring backing plate 31, the anchorage device 32 is sleeved on the prestressed tendon 5, a tapered hole is formed in the middle of the anchorage device, the end part of the prestressed tendon 5 is anchored by the anchorage device 32 through a wedge-shaped piece 33, and the wedge-shaped piece 33 is inserted into the tapered hole of the anchorage device 32 to anchor the prestressed tendon 5; the steel plate 35 with the groove and the anchoring backing plate 31 are arranged at intervals and connected through the screw rods 34 and the nuts 36, specifically, the anchoring backing plate 31 is provided with a plurality of through holes capable of penetrating the screw rods 34, the steel plate 35 with the groove is provided with corresponding through holes 352 for the screw rods 34 to penetrate, the two ends of each screw rod 34 penetrate through the corresponding holes of the steel plate 35 with the anchoring backing plate 31 with the groove, the nuts 36 are arranged between the steel plate 35 with the groove and the anchoring backing plate 31, one screw rod 34 corresponds to the two nuts 36 and the two nuts 36 are arranged, the two nuts 36 respectively abut against the steel plate 35 with the groove and the anchoring backing plate 31, the steel plate 35 with the groove and the assembled truss 2 are fixedly connected, and the outward thrust of the assembled truss 2 can be transmitted to the anchoring backing plate 31 through the nuts 36 and the screw rods 34 and. In order to facilitate disassembly, the steel plate 35 with the groove is provided with a U-shaped groove 351 with an upward opening, the prestressed tendon 5 penetrates through the U-shaped groove 351 and the bottom of the U-shaped groove 351 is supported at the bottom of the U-shaped groove 351, and both the pushing device 1 and the assembled truss 2 for penetrating the prestressed tendon 5 can adopt a structure similar to the U-shaped groove 351 so as to facilitate disassembly.
preferably, the two assembled trusses 2 on both sides are provided with outward extending steel plates 21 extending outwards from the back side, as shown in fig. 11, the outward extending steel plates 21 are fixed to the steel plates 35 with grooves by bolts, preferably, the outward extending steel plates 21 are provided with two pieces and vertically arranged, the two sides of the steel plates 35 with grooves are provided with connecting side plates connected to the steel plates 35 with grooves, the connecting side plates are embedded in the middle of the outward extending steel plates 21 and are provided with corresponding bolt holes with the outward extending steel plates 21 so as to be fixedly connected by bolts. Choose arbitrary quantity of assembled truss 2 for use, vertically splice, can satisfy the arrangement of arbitrary longitudinal length prestressing tendons, according to the horizontal bridge of the prestressing tendons of design to the distribution condition, transversely splice assembled truss 2, can erect a plurality of prestressing tendons simultaneously to stretch-draw shaping once improves work efficiency.
The invention also provides a reinforcing method for assembling prestress for the bridge structure, which comprises the following steps:
S1, connecting the fabricated truss 2 with the pushing beam 11; and splicing the corresponding span assembly type truss 2 in advance in a factory according to the designed length of the prestressed tendon, and connecting and fixing the truss with the pushing device 1. According to the number of prestressed tendons in the cross section, a plurality of assembled trusses are spliced at intervals in the transverse bridge direction (the left and right directions in the visual angles of fig. 7 and 13) so as to be used for simultaneously tensioning a plurality of prestressed tendons 5; and in the longitudinal bridge direction (the left and right directions in the figure 1), according to the length of the prestressed tendons required by design, selecting a sufficient number of assembled trusses 2 for longitudinal splicing installation.
and S2, mounting the prestressed tendons on the assembled truss 2 and the pushing device 1 in a penetrating manner, and mounting the anchoring device 3 to axially fixedly connect the prestressed tendons 5 with the assembled truss 2 so as to transmit axial tension. Specifically, the prestressed tendons 5 with corresponding lengths are cut, erected in the prestressed tendon channels arranged in the installed pushing device 1, and after preliminary fixing, the steel plate 35 with the grooves and the overhanging steel plate 21 are fixedly connected through bolts. Two ends of the prestressed tendon 5 penetrate through the anchoring backing plate 31, the anchoring backing plate 31 is connected with the steel plate 35 with the groove through the screw 34 and the nut 36, so that the axial force (tension prestress) transmission effect is achieved, finally, the prestressed tendon 5 exposed outside and penetrating through the anchoring backing plate 31 is initially anchored through the anchorage device 32, and the prestressed tendon 5 is anchored by placing the wedge-shaped piece 33. During installation, the prestressed tendons 5 and the anchorage 32 can be combined by slightly tensioning the winch.
s3, driving the pushing beam 11 to slide outwards, pulling the prestressed tendon 5 to the designed elongation, and then axially fixing the pushing beam 11 to prevent the pushing beam from retracting; specifically, the driving gear 17 is driven to rotate by the winch, the two transmission gears 13 rotate and drive the pushing beam 11 to move back and forth, the anchoring device 3 is pushed to move outwards, the prestressed tendons 5 are stretched outwards from two ends, the pushing prestressed tendons 5 are extended and deformed, according to the moment balance principle, the rotating angle displacement of the driving gear 17 is large, the force required by rotation is small, the radius of the transmission gears 13 is large, and therefore the pushing force which can be achieved by driving the transmission gears 13 of the driving gear 17 to rotate is large. The amount of elongation of the tendon can be calculated more accurately from the total angular displacement experienced by the drive gear 17. The stretching elongation of the prestressed tendon 5 can be accurately controlled by the rotating angle of the driving gear 17. When the elongation or the tension reaches a preset value, the gear set is limited to rotate by the gear limiting device 15, so that the pushing beam 11 is axially fixed.
and S4, installing the beam bottom anchoring pedestal 4 at the bottom of the bridge 6 according to the design position of the prestressed tendon 5, and then connecting and fixing the anchoring device 3 and the beam bottom anchoring pedestal 4 one by one. Specifically, the whole set of device is transported to a construction site, the beam bottom anchoring pedestals 4 with corresponding quantity are embedded at the bottom of the bridge 6, specifically, the horizontal steel plates 41 and the U-shaped steel plates 42 are embedded and fixed in place by high-strength steel nails, and the state as shown in fig. 6 and 7 is achieved. Then, the beam bottom anchoring pedestal 4 and the anchoring device 3 (anchoring pad 31) are connected by high-strength bolts.
and S5, removing the axial fixation of the pushing beam 11 to enable the pushing beam to freely slide, and applying prestress to the bridge by the prestressed tendon 5. Specifically, utilize the hoist engine slight rotation driving gear 17, eliminate the pressure that gear stop device 15 received, then take out gear stop device 15, slowly put and open, let prestressing tendons 5 retract naturally, make prestressing force transmit to ground tackle 32 and anchor backing plate 31, transmit prestressing force to the bridge bottom through the bolt that anchor backing plate 31 and beam-bottom anchor pedestal 4 are connected.
And then removing the pushing device 1, and performing anchor sealing and corrosion prevention on the anchorage device 32. Specifically, after the prestressed tendons 5 are tensioned, the steel plates 35 with the grooves at the two ends relieve pressure, the gear rotates in the opposite direction, the steel plates 35 with the grooves, the screw rods 34 and the nuts 36 can be pulled out, and the assembled truss 2 and the pushing device 1 can be further disassembled, so that the assembled truss and the pushing device 1 can be conveniently tensioned and reinstalled for use in the next construction.
After the dismantling operation is finished, the anchoring areas at the two ends of the prestressed tendon 5 are sealed by concrete, and the prestressed tendon 5, the anchorage device 32, the anchoring base plate 31 and the beam bottom anchoring pedestal 4 are prevented from being corroded.
The number of the tensioned prestressed tendons is only one example adopted in the embodiment, and in the actual use process, one or more prestressed tendons can be tensioned simultaneously according to the reinforcement design requirement.
The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.
Claims (10)
1. The utility model provides a can dismantle device for bridge construction assembly prestressing force which characterized in that: comprises a pushing device (1), an anchoring device (3), a beam bottom anchoring pedestal (4) and a prestressed tendon (5); the pushing device (1) comprises a rack and a pushing beam (11) arranged on the rack, and the pushing beam (11) is connected with a tension driving mechanism for driving the pushing beam to horizontally slide;
The prestressed tendons (5) penetrate through the pushing device (1) and apply the tension force of the pushing beam (11) in the longitudinal bridge direction to the prestressed tendons (5) through the anchoring device (3);
the anchoring device (3) is connected with the beam bottom anchoring pedestal (4) to transfer the prestress of the prestressed tendon (5);
The beam bottom anchoring pedestal (4) is used for being connected with a bridge.
2. The demountable installation of a pre-stressed bridge construction according to claim 1, wherein: the pushing device is characterized by further comprising an assembly type truss (2), wherein the assembly type truss (2) is arranged on two sides of the pushing device (1) along the sliding direction of the pushing beam (11); the pushing beam (11) is connected with the assembly type truss (2) to transmit longitudinal tension force; the anchoring device (3) connects the prestressed tendons (5) with the fabricated truss (2) to transfer the tension force in the longitudinal bridge direction.
3. the device of claim 2, wherein the detachable pre-stressing device is a device for erecting a bridge structure, comprising: the two ends of the prestressed tendon (5) extend out of the assembled truss (2) and are connected with the assembled truss (2) through the anchoring device (3).
4. A demountable installation for erecting a prestress for a bridge construction according to claim 3, wherein: the pushing beams (11) are arranged at the upper end and the lower end of the pushing device (1), the upper end and the lower end of each pushing beam (11) are respectively provided with two pushing beams, and the back ends of the two pushing beams (11) at the upper end and the lower end are respectively fixedly connected with the assembly type trusses (2) at the two sides.
5. The demountable installation of pre-stressing elements according to claim 4, wherein: the pushing beams (11) are provided with a row of convex teeth (111) arranged along the sliding direction of the pushing beams, the tensioning driving mechanism comprises four transmission gears (13) and a driving gear (17), the four transmission gears (13) are respectively meshed with the convex teeth (111) of the four pushing beams (11) at the upper end and the lower end, the four transmission gears (13) are distributed in a rectangular shape and are mutually meshed, and one transmission gear (13) is meshed with the driving gear (17); the driving gear (17) is connected with a power device to obtain power.
6. The demountable installation of a pre-stressed bridge construction according to claim 5, wherein: the gear limiting device (15) is further included, and the gear limiting device (15) is used for controlling the transmission gear (13) to rotate.
7. The demountable installation of a pre-stressed bridge construction according to claim 1, wherein: the anchoring device (3) comprises an anchoring backing plate (31), an anchorage device (32), a screw rod (34), a steel plate (35) with a groove and a nut (36);
the anchoring base plate (31) is fixedly connected with the beam bottom anchoring base (4), the prestressed tendons (5) extend outwards to sequentially pass through the steel plate (35) with the grooves and the anchoring base plate (31), an anchorage device (32) is arranged on the outer side of the anchoring base plate (31), and the anchorage device (32) anchors the end parts of the prestressed tendons (5) through wedge-shaped pieces (33); take recess steel sheet (35) and anchor backing plate (31) interval to set up and be connected through screw rod (34) and nut (36), two nuts (36) of corresponding installation of a screw rod (34), nut (36) set up in the middle of taking recess steel sheet (35) and anchor backing plate (31) and offset with taking recess steel sheet (35) and anchor backing plate (31) respectively, take recess steel sheet (35) and assembled truss (2) fixed connection.
8. The demountable installation of pre-stressing elements according to claim 7, wherein: the steel plate (35) with the groove is provided with a U-shaped groove (351) with an upward opening.
9. The demountable installation of pre-stressing elements according to claim 7, wherein: the assembled truss (2) on the two sides extends outwards from the back side and is provided with an overhanging steel plate (21), and the overhanging steel plate (21) is fixedly connected with a steel plate (35) with a groove through a bolt.
10. A method for reinforcing a bridge structure by assembling prestress is characterized by comprising the following steps:
S1, connecting the fabricated truss (2) with the pushing beam (11);
S2, mounting the prestressed tendons on the assembled truss (2) and the pushing device (1) in a penetrating manner, mounting the anchoring device (3) and connecting the prestressed tendons (5) with the assembled truss (2) to transfer axial tension;
S3, driving the pushing beam (11) to slide outwards, pulling the prestressed tendon (5) to the designed elongation, and then axially fixing the pushing beam (11) to prevent the pushing beam from retracting;
S4, mounting a beam bottom anchoring pedestal (4) at the bottom of the bridge (6) according to the design position of the prestressed tendon (5), and then connecting and fixing the anchoring device (3) and the beam bottom anchoring pedestal (4) one by one;
And S5, removing the axial fixation of the pushing beam (11) to enable the pushing beam to freely slide, and applying the prestress to the bridge by the prestressed tendon (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305039A (en) * | 2020-01-22 | 2020-06-19 | 长沙理工大学 | Device for improving stress distribution of swivel cable-stayed bridge and installation method thereof |
| WO2023159811A1 (en) * | 2022-02-28 | 2023-08-31 | 长沙理工大学 | Device for applying external prestress on basis of on-site release, and bridge reinforcement method |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100991869B1 (en) * | 2010-02-09 | 2010-11-04 | 추태헌 | Single and continuous prestressed concrete girder bridge and the construction method |
| CN101942808A (en) * | 2010-09-30 | 2011-01-12 | 长沙理工大学 | Construction technology for simply supported and continuously supported external prestressed continuous beam bridge T-shaped section |
| CN102127950A (en) * | 2011-02-15 | 2011-07-20 | 全恩懋 | Automatic centering tensioning and anchoring device for prestressed sheet clamping anchorage |
| CN104264593A (en) * | 2014-09-05 | 2015-01-07 | 华侨大学 | Surface embedded bar reinforced prestress tension method and device |
| CN105064695A (en) * | 2015-08-17 | 2015-11-18 | 长沙理工大学 | Secondary tensioning and tension releasing device and method for prestressed tendon |
| CN105862608A (en) * | 2016-05-20 | 2016-08-17 | 东南大学 | Automatic tensioning system and method of prestress fiber plate reinforcing beam plate |
| CN106320191A (en) * | 2016-08-31 | 2017-01-11 | 西安公路研究院 | Pre-tensioning steel wire and polymer mortar externally-added layer reinforcing device |
| CN106382011A (en) * | 2016-11-09 | 2017-02-08 | 陕西通宇新材料有限公司 | Tensioning-anchoring system and method for prestressed carbon fiber plate of concrete structure |
| CN206486822U (en) * | 2017-01-18 | 2017-09-12 | 中交第一公路勘察设计研究院有限公司 | A kind of bridge strengthening is with high-strength prestressed steel wire batch stretching and anchoring device |
| CN107599158A (en) * | 2017-09-26 | 2018-01-19 | 汤始建华建材（苏州）有限公司 | A kind of process for prestressed component two directions tension |
| CN108000702A (en) * | 2018-01-05 | 2018-05-08 | 河北益铁机电科技有限公司 | Dual-direction pre-tensioning system prestressed concrete track slab mould and its application |
| CN108103965A (en) * | 2018-01-12 | 2018-06-01 | 长沙理工大学 | It is a kind of to reinforce with prestressing force Bailey beam and its construction method |
| CN108193607A (en) * | 2018-01-12 | 2018-06-22 | 长沙理工大学 | It is a kind of to reinforce with prefabricated PC truss and its construction method |
| CN109371859A (en) * | 2018-12-10 | 2019-02-22 | 长安大学 | It is a kind of to reinforce girder-embedded arch structure and its construction method across box girder bridge greatly |
| CN109676784A (en) * | 2019-01-23 | 2019-04-26 | 四川公路桥梁建设集团有限公司 | A kind of assembled steel-concrete combined structure pedestal and pre-tensioning system T beam construction |
| CN110029592A (en) * | 2019-04-12 | 2019-07-19 | 长沙理工大学 | A kind of external prestressing FRP tendons stretching and anchoring device |
| CN211006393U (en) * | 2019-09-09 | 2020-07-14 | 长沙理工大学 | Detachable device for assembling prestress for bridge structure |
-
2019
- 2019-09-09 CN CN201910846025.6A patent/CN110565546B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100991869B1 (en) * | 2010-02-09 | 2010-11-04 | 추태헌 | Single and continuous prestressed concrete girder bridge and the construction method |
| CN101942808A (en) * | 2010-09-30 | 2011-01-12 | 长沙理工大学 | Construction technology for simply supported and continuously supported external prestressed continuous beam bridge T-shaped section |
| CN102127950A (en) * | 2011-02-15 | 2011-07-20 | 全恩懋 | Automatic centering tensioning and anchoring device for prestressed sheet clamping anchorage |
| CN104264593A (en) * | 2014-09-05 | 2015-01-07 | 华侨大学 | Surface embedded bar reinforced prestress tension method and device |
| CN105064695A (en) * | 2015-08-17 | 2015-11-18 | 长沙理工大学 | Secondary tensioning and tension releasing device and method for prestressed tendon |
| CN105862608A (en) * | 2016-05-20 | 2016-08-17 | 东南大学 | Automatic tensioning system and method of prestress fiber plate reinforcing beam plate |
| CN106320191A (en) * | 2016-08-31 | 2017-01-11 | 西安公路研究院 | Pre-tensioning steel wire and polymer mortar externally-added layer reinforcing device |
| CN106382011A (en) * | 2016-11-09 | 2017-02-08 | 陕西通宇新材料有限公司 | Tensioning-anchoring system and method for prestressed carbon fiber plate of concrete structure |
| CN206486822U (en) * | 2017-01-18 | 2017-09-12 | 中交第一公路勘察设计研究院有限公司 | A kind of bridge strengthening is with high-strength prestressed steel wire batch stretching and anchoring device |
| CN107599158A (en) * | 2017-09-26 | 2018-01-19 | 汤始建华建材（苏州）有限公司 | A kind of process for prestressed component two directions tension |
| CN108000702A (en) * | 2018-01-05 | 2018-05-08 | 河北益铁机电科技有限公司 | Dual-direction pre-tensioning system prestressed concrete track slab mould and its application |
| CN108103965A (en) * | 2018-01-12 | 2018-06-01 | 长沙理工大学 | It is a kind of to reinforce with prestressing force Bailey beam and its construction method |
| CN108193607A (en) * | 2018-01-12 | 2018-06-22 | 长沙理工大学 | It is a kind of to reinforce with prefabricated PC truss and its construction method |
| CN109371859A (en) * | 2018-12-10 | 2019-02-22 | 长安大学 | It is a kind of to reinforce girder-embedded arch structure and its construction method across box girder bridge greatly |
| CN109676784A (en) * | 2019-01-23 | 2019-04-26 | 四川公路桥梁建设集团有限公司 | A kind of assembled steel-concrete combined structure pedestal and pre-tensioning system T beam construction |
| CN110029592A (en) * | 2019-04-12 | 2019-07-19 | 长沙理工大学 | A kind of external prestressing FRP tendons stretching and anchoring device |
| CN211006393U (en) * | 2019-09-09 | 2020-07-14 | 长沙理工大学 | Detachable device for assembling prestress for bridge structure |
Non-Patent Citations (4)
| Title |
|---|
| 刘秀元;: "先张CRTSⅢ轨道板张拉技术研究", 铁道建筑技术, no. 04, 20 April 2016 (2016-04-20) * |
| 吴春杰;王帅舟;: "顶推法施工的连续梁桥", 中小企业管理与科技(下旬刊), no. 05, 25 May 2009 (2009-05-25) * |
| 郭风琪;袁石沣;单智;: "新型体外预应力体系预应力瞬时损失试验研究", 铁道科学与工程学报, no. 06, 28 December 2014 (2014-12-28) * |
| 陈瑜, 关建光, 赵基达, 徐福泉: "双向张拉连续多跨折线型体外预应力加固技术", 建筑科学, no. 03, 20 June 2000 (2000-06-20) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305039A (en) * | 2020-01-22 | 2020-06-19 | 长沙理工大学 | Device for improving stress distribution of swivel cable-stayed bridge and installation method thereof |
| CN111305039B (en) * | 2020-01-22 | 2021-06-01 | 长沙理工大学 | Device for improving stress distribution of swivel cable-stayed bridge and installation method thereof |
| WO2023159811A1 (en) * | 2022-02-28 | 2023-08-31 | 长沙理工大学 | Device for applying external prestress on basis of on-site release, and bridge reinforcement method |
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