CN211171669U - External prestress reinforcing device of bridge structure - Google Patents

Abstract

The utility model discloses an external prestress reinforcing device of a bridge structure, which comprises two groups of fixed anchorage devices, a plurality of steering assemblies, a plurality of steering frames, a shock absorber and a plurality of steel cables; each component is arranged in a box girder of the bridge along the central line of the width direction of the bridge and is respectively connected and fixed with the box girder; the two fixing anchors are respectively arranged at two ends of the box girder, the bogie, the steering assembly and the shock absorber are respectively symmetrically distributed in the box girder at intervals by taking the supporting mechanism of the bridge as a central shaft, and the bogie, the steering assembly, the shock absorber and the steering assembly are gradually far away from the supporting mechanism of the bridge; one end of the steel cable is fixed, and the other end of the steel cable penetrates through one of the fixing anchors, penetrates through all the components in the box girder in sequence, and penetrates out of the other fixing anchor and is fixed. The utility model has the advantages that: device and construction method can prevent effectively that weak department from appearing in a certain department of case roof beam, avoids the bridge to damage.

Description

External prestress reinforcing device of bridge structure

Technical Field

The utility model relates to a bridge reinforcement technical field, concretely relates to external prestressing force reinforcing apparatus of bridge structures.

Background

Many bridges are built for a long time, and as vehicles are increased and the load of the vehicles is increased, the structural strength of the older bridges has a certain influence, so that the bridges need to be reinforced to prolong the service life of the bridges. At present, the bridge section is reinforced by adopting a mode of enlarging the bridge section, and when the mode is adopted for reinforcement, if the mode is not analyzed from the perspective of the overall structure in the design, the mode is enlarged only for local enlargement, so that the other parts of the overall structure form weak layers to cause serious damage.

Disclosure of Invention

An object of the utility model is to provide a bridge structures's external prestressing force reinforcing apparatus, solve among the prior art and lead to the technical problem of weak point appearing in other positions through increasing the component cross-section to the not enough of prior art.

The utility model adopts the technical proposal that: an external prestress reinforcing device of a bridge structure comprises two groups of fixed anchors, a plurality of steering assemblies, a plurality of steering frames, a shock absorber and a plurality of steel cables; each component is arranged in a box girder of the bridge along the central line of the width direction of the bridge and is respectively connected and fixed with the box girder; the two fixing anchors are respectively arranged at two ends of the box girder, the bogie, the steering assembly and the shock absorber are respectively symmetrically distributed in the box girder at intervals by taking the supporting mechanism of the bridge as a central shaft, and the bogie, the steering assembly, the shock absorber and the steering assembly are gradually far away from the supporting mechanism of the bridge; one end of the steel cable is fixed, and the other end of the steel cable penetrates through one of the fixing anchors, penetrates through all the components in the box girder in sequence, and penetrates out of the other fixing anchor and is fixed.

According to the scheme, the fixing anchorage device comprises an anchoring diaphragm plate and a plurality of anchorage devices, the anchoring diaphragm plate is fixed on the section of the box girder, a first mounting hole is formed in the middle of the anchoring diaphragm plate, and first fixing holes are symmetrically formed in two sides of the first mounting hole; the anchorage device is arranged in the first fixing hole, and the steel cable penetrates into the anchorage device from the first fixing hole.

According to the scheme, the anchorage device comprises a sealing cylinder, an embedded cylinder, a wire separator, an anchor backing plate, a fixing nut and a protective cover, wherein the sealing cylinder and the embedded cylinder are coaxial and are sequentially arranged from inside to outside; one end of the embedded cylinder penetrates out of a first fixing hole of the anchoring transverse partition plate, and an anchor plate is arranged between the other end of the embedded cylinder and the protective cover; the steel cable penetrates through an anchor backing plate of a fixing anchorage device at one end of the bridge, axially enters the sealing cylinder and penetrates out through the wire separator.

According to the scheme, the spiral ribs are sleeved outside the embedded cylinder and embedded in the anchoring diaphragm plate; the anchor backing plate and the embedded cylinder are coaxially arranged, and the anchor backing plate is fixedly connected with the anchoring diaphragm plate; the anchor plate is provided with a plurality of first penetrating holes, one ends of the first penetrating holes, which are far away from the sealing cylinder, are internally provided with working clamping pieces, and the working clamping pieces clamp the steel cable; the end part of the anchor plate is detachably connected with a fixing plate, and the inner side of the fixing plate is abutted against the working clamping piece; a first sealing ring and a second sealing ring are respectively arranged at two ends of the sealing cylinder, a second penetrating hole is formed in the first sealing ring, and the first sealing ring is connected with the anchor backing plate through a screw; the second sealing ring is provided with a third penetrating hole, and the first penetrating hole, the second penetrating hole and the third penetrating hole are coaxial.

According to the scheme, the steering assembly comprises a steering block and a first steering gear, the steering block is fixedly connected with the box girder, a first through hole is formed in the steering block, the first through hole is located below the steering block, and a second mounting hole is formed in the middle of the steering block; the first steering gear is arranged in the first through hole; the first steering device comprises a first outer sleeve, a first through steel pipe and a first steering pipe matched with the first through steel pipe, the first outer sleeve is arranged in the first through hole, and the outer wall of the first outer sleeve is fixedly connected with the hole wall of the first through hole; the first crossing sleeve is arranged in the first outer sleeve, and one end of the first crossing steel pipe is bent upwards in an inclined manner; the outer wall of the first penetrating steel pipe can be contacted with the inner wall of the first outer sleeve; the first steering pipe is installed in the first penetrating steel pipe, and epoxy iron sand is filled in a gap between the first steering pipe and the first penetrating steel pipe.

According to the scheme, the bogie is connected with the box girder and is symmetrically arranged at two sides of the box girder close to the supporting mechanism; the bogie comprises a first bracket, a second bracket and a second steering gear, wherein the first bracket and the second bracket are respectively connected with the box girder; the second bracket is provided with a fifth through hole which corresponds to and is coaxially arranged with the third through hole and a sixth through hole which corresponds to and is coaxially arranged with the fourth through hole; the second steering gear is arranged in the third through hole and the sixth through hole, and part of the steel cable passes through the first bracket through the second steering gear and then passes through the second bracket through the fifth through hole; other steel cables pass through the first support through the fourth through hole and then pass through the second support through the second steering gear.

According to the scheme, the second steering device comprises a second outer sleeve, a second penetrating steel pipe and a second steering pipe matched with the second penetrating steel pipe, the second outer sleeve is arranged in the third through hole or the sixth through hole, and the outer wall of the second outer sleeve is fixedly connected with the hole wall of the third through hole or the sixth through hole; the second crossing sleeve is arranged in the second outer sleeve, and one end of the second crossing steel pipe is bent downwards; the outer wall of the second penetrating steel pipe can be contacted with the inner wall of the second outer sleeve; the second steering pipe is arranged in the second penetrating steel pipe, and epoxy iron sand is filled in a gap between the second steering pipe and the second penetrating steel pipe; two sides of one supporting mechanism are respectively provided with a bogie, and the inclined bent ends of the second steering gears on the bogies on the two sides of the supporting mechanism are deviated from each other.

According to the scheme, the shock absorber comprises a fixed support and a plurality of shock absorbing pieces, and the fixed support is connected with the box girder; each shock absorber is arranged corresponding to one steel cable; the vibration damping piece comprises a cable clamp and two arc-shaped damping rubber sheets, and the two damping rubbers are spliced and fixed in the cable clamp; the cable clamp is of a split structure and is detachably connected with each other up and down through a bolt by two half cable clamps.

According to the scheme, the steel cable comprises a sheath, a plurality of galvanized steel strands and an anticorrosive filler, wherein the sheath is a hollow pipe body, the galvanized steel strands are arranged in the sheath along the axial direction of the sheath, and the galvanized steel strands are twisted with each other; the sheath is filled with antiseptic filler.

Compared with the prior art, the beneficial effects of the utility model are that: the reinforcing device of the utility model is provided with a plurality of groups of steering components and a steering frame, and utilizes the steering action of the steering frame and the steering components on the steel cable; when a vehicle enters the middle part of the box girder, the middle part of the box girder is subjected to a downward convex force, and the force is transferred under the action of the steering assembly and the steel cable, so that the bridge is prevented from being damaged due to the weak point; when the vehicle is close to the supporting mechanism, the box girder generates upward convex force, and at the moment, due to the combined action of the bogie and the steel cable, the force is transmitted to other parts of the box girder, so that a weak part at a certain position of the box girder can be effectively prevented, and the bridge is prevented from being damaged.

Drawings

Fig. 1 is a schematic view of a bridge structure in this embodiment.

Fig. 2 is a schematic structural diagram of a bridge side device.

Fig. 3 is a schematic view of the connection of the anchoring diaphragm to the box girder.

FIG. 4 is a schematic view of the construction of the anchor.

Fig. 5 is a schematic view of the structure of the box girder and one of the turning blocks.

Fig. 6 is a schematic structural view of the first diverter.

Fig. 7 is a schematic view of the structure of a box girder and another turning block.

Fig. 8 is a schematic structural view of a first diverter on another diverter block.

Fig. 9 is a schematic structural view of the box girder and the first bracket.

Fig. 10 is a schematic structural view of the box girder and the second bracket.

Fig. 11 is a schematic structural view of the second steering gear and the first bracket.

Fig. 12 is a schematic view of a second diverter on one side of the support mechanism.

Fig. 13 is a schematic view of the second diverter on the other side of the support mechanism.

FIG. 14 is a schematic view of the construction of the steel cord.

Fig. 15 is a schematic view of the connection of the box girder and the damper.

Fig. 16 is a schematic structural view of the cord clip.

Fig. 17 is a schematic structural view of the damping member.

Fig. 18 is a schematic view of the connection of the box girder and the supporting steel plate.

Fig. 19 is a partially enlarged view of M in fig. 18.

Fig. 20 is a schematic structural view of a box girder and a carbon fiber plate.

Fig. 21 is a partially enlarged view of fig. 20 at N.

Wherein: 1. a bridge; 11. a box girder; 12. a support mechanism; 2. fixing an anchorage device; 21. anchoring the diaphragm plate; 22. an anchorage device; 22a, embedding a cylinder; 22b, a spiral rib; 22c, a sealing cylinder; 22d, a filament divider; 22e, anchor plate; 22f, anchor backing plates; 22g, fixing a nut; 22h, a first sealing washer; 22i, a second sealing gasket; 22j, a working jaw; 22k, a fixing plate; 22l of protective cover; 3. a steering assembly; 31. a turning block; 32. a first steering gear; 321. a first outer sleeve; 322. a first passing steel pipe; 323. a first steering tube; 4. a bogie; 41. a first bracket; 42. a second bracket; 43. a second diverter; 431. a second outer sleeve; 432. a second passing steel pipe; 433. a second steering tube; 5. a steel cord; 51. a sheath; 52. galvanized steel strands; 53. an anti-corrosive filler; 6. a shock absorber; 61. fixing a bracket; 62. a vibration damping member; 7. a carbon fiber plate.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

The bottom of the bridge deck of the bridge 1 structure is provided with a box girder 11, and the box girder 11 is supported by a plurality of supporting mechanisms 12; the support mechanism 12 is a pier. In this embodiment, as shown in fig. 1, the bridge girder 1 is supported by two sets of piers, and the bridge girder 1 further includes at least one carbon fiber plate 7, and the carbon fiber plate 7 is connected to the bottom plate of the box girder 11 and is disposed along the guide of the bottom plate of the box girder 11, as shown in fig. 20 and 21.

As shown in fig. 2, the external prestress reinforcing device of a bridge 1 structure comprises two groups of fixed anchors 2, a plurality of steering assemblies 3, a plurality of bogies 4, a shock absorber 6 and a plurality of steel cables 5; each component is arranged in a box girder 11 of the bridge 1 along the center line of the width direction of the bridge 1 and is respectively connected and fixed with the box girder 11; the two fixing anchors 2 are respectively arranged at two ends of the box girder 11, the bogie 4, the steering component 3 and the shock absorber 6 are respectively symmetrically distributed in the box girder 11 at intervals by taking the supporting mechanism 12 of the bridge 1 as a central shaft, and the bogie 4, the steering component 3, the shock absorber 6 and the steering component 3 are gradually far away from the supporting mechanism 12 of the bridge 1; one end of the steel cable 5 is fixed, and the other end of the steel cable 5 penetrates through one of the fixing anchors 2, sequentially penetrates through each component in the box girder 11, and then penetrates out of the other fixing anchor 2 and is fixed.

In this embodiment, the bridge 1 has two support mechanisms 12, i.e. two bridge piers, which are correspondingly, as shown in fig. 1 and 2, the reinforcing device includes two groups of fixing anchors 2, six steering assemblies 3, three dampers 6 and four bogies 4, one end of a steel cable 5 is fixed, and the other end of the steel cable penetrates through one of the fixing anchors 2 and sequentially passes through a steering mechanism (a first steering mechanism), a damper 6, a steering mechanism (a second steering mechanism), the bogie 4 (the first steering frame 4), the bogie 4 (the second steering frame 4), the steering mechanism (a third steering mechanism), the damper 6, the steering mechanism (a fourth steering mechanism), the bogie 4 (the third steering frame 4), the bogie 4 (the fourth steering frame 4), the steering mechanism (a fifth steering mechanism), the damper 6 and the steering mechanism (a sixth steering mechanism) and then penetrates out and is fixed by a fixing anchor at the other end. If the bridge 1 is longer and the number of supporting mechanisms 12 for supporting is more, the number of the steering assemblies 3, the number of the bogies 4 and the number of the shock absorbers 6 in the reinforcing device are correspondingly increased so as to meet the requirements.

Preferably, as shown in fig. 3 and 4, the fixing anchors 2 include an anchoring diaphragm 21 and a plurality of anchors 22, the anchoring diaphragm 21 is fixed on the cross section of the box girder 11, a first mounting hole is formed in the middle of the anchoring diaphragm 21, and first fixing holes are symmetrically formed in two sides of the first mounting hole; the anchorage device 22 is arranged in the first fixing hole, and the steel cable 5 penetrates into the anchorage device 22 from the first fixing hole. In this embodiment, there are six first fixing holes respectively disposed on two sides of the first mounting hole (the first mounting hole is used for a worker to pass through the inside of the box girder). The anchorage device 22 comprises a sealing cylinder 22c and an embedded cylinder 22a which are coaxial and are sequentially configured from inside to outside, a wire separator 22d which is hermetically connected with one end of the sealing cylinder 22c, an anchor backing plate 22f which is arranged at the other end of the sealing cylinder 22c and is hermetically connected with the other end of the sealing cylinder 22c, and a fixing nut 22g and a protective cover 22l which are coaxial with the anchor backing plate 22f and are sequentially arranged outside the anchor backing plate 22 f; one end of the embedded cylinder 22a penetrates through a first fixing hole of the anchoring diaphragm plate 21, and an anchor plate 22e is arranged between the other end of the embedded cylinder 22a and the protective cover 22 l; the steel cable 5 penetrates through the anchor backing plate 22f of the fixing anchor 2 at one end of the bridge 1, axially enters the sealing cylinder 22c and penetrates out through the wire separator 22 d.

In the utility model, the spiral rib 22b is sleeved outside the pre-buried cylinder 22a, and the spiral rib 22b is pre-buried in the anchoring diaphragm plate 21; the anchor backing plate 22f and the embedded cylinder 22a are coaxially arranged, and the anchor backing plate 22f is fixedly connected with the anchoring diaphragm plate 21; the anchor plate 22e is provided with a plurality of first penetrating holes, one end of each first penetrating hole, which is far away from the sealing cylinder 22c, is internally provided with a working clamping piece 22j (the position where the working clamping piece 22j is arranged is a conical hole), and the working clamping piece 22j clamps the steel cable 5; the end part of the anchor plate 22e is detachably connected with a fixing plate 22k, and the inner side of the fixing plate 22k abuts against the working clamping piece 22 j; a first sealing washer 22h and a second sealing washer 22i are respectively arranged at two ends of the sealing cylinder 22c, a second penetrating hole is formed in the first sealing washer 22h, and the first sealing washer 22h is connected with the anchor backing plate 22f through a screw; the second sealing washer 22i is provided with a third penetrating hole, and the first penetrating hole, the second penetrating hole and the third penetrating hole are coaxial; the sealing cylinder 22c is filled with an anticorrosive filler 53; the interior of the protective cover 22l is hollow, one end of the protective cover is opened, a fixing nut 22g is coaxially covered in the opening end of the protective cover 22l, and the fixing nut 22g is in threaded connection with the anchor backing plate 22 f; the opening end of the protective cover 22l is detachably connected with the anchor plate 22e through a screw, specifically, a radial convex ring is arranged at the end of the protective cover 22l, and the convex ring is connected with the anchor plate 22e through a bolt; the protective cover 22l is filled with anticorrosive grease. The steel cable 5 passes through the anchor backing plate 22f, the working clamping piece 22j, the first penetrating hole, the second penetrating hole, the third penetrating hole and the wire separator 22d, and then passes out. In this embodiment, the external cable anchorage 1 is integrally pulled out by using the jack, when the steel cable 5 is tensioned to meet the design requirement, the fixing nut 22g is rotated to the anchor backing plate 22f and abuts against the anchor backing plate 22f, and the tensioning force is transmitted to the anchor backing plate 22f through the fixing nut 22g and then transmitted to the box girder concrete through the anchor backing plate 22 f.

The utility model discloses in, reinforcing apparatus includes six and turns to subassembly 3, six turn to two liang of a set of symmetrical arrangement of subassembly 3, and a set of subassembly 3 that turns to sets up between anchor cross slab 21 and supporting mechanism 12, and another group sets up between two supporting mechanism 12, and remaining a set of sets up between another anchor cross slab 21 and another supporting mechanism 12. The steering assembly 3 comprises a steering block 31 and a first steering gear 32, the steering block 31 is fixedly connected with the box girder 11, as shown in fig. 5, a first through hole is formed in the steering block 31, the first through hole is positioned below the steering block 31, and a second mounting hole (used for a worker to pass through) is formed in the middle of the steering block 31; the first steering gear 32 is arranged in the first through hole, and one first steering gear 32 is correspondingly arranged on one steel cable 5. Preferably, as shown in fig. 6, the first steering gear 32 includes a first outer sleeve 321, a first passing steel tube 322, and a first steering tube 323 adapted to the first passing steel tube 322, the first outer sleeve 321 is disposed in the first through hole, and an outer wall of the first outer sleeve 321 is fixedly connected to a hole wall of the first through hole; the first crossing sleeve is arranged in the first outer sleeve 321, and one end of the first crossing steel pipe 322 is bent upwards in an inclined manner; the outer wall of the first pass-through steel tube 322 may contact the inner wall of the first outer sleeve 321; the first steering pipe 323 is installed in the first passing steel pipe 322, and epoxy iron sand is filled in a gap between the first steering pipe 323 and the first passing steel pipe 322. In this embodiment, the upwardly inclined curved ends of two adjacent first diverters 32 face away from each other, as shown in fig. 5 to 8.

Preferably, the bogie 4 is connected with the box girder 11 and symmetrically arranged at two sides of the box girder close to the supporting mechanism 12, and the bogie 4 is provided with at least one second through hole; the bogie 4 comprises a first bracket 41 and a second bracket 42 (shown in fig. 9 and 10) which are respectively connected with the box girder 11, and a second steering gear 43, wherein the first bracket 41 is provided with a third through hole and a fourth through hole, and the axis of the third through hole is parallel to the axis of the fourth through hole; the second bracket 42 is provided with a fifth through hole which corresponds to and is coaxially arranged with the third through hole, and a sixth through hole which corresponds to and is coaxially arranged with the fourth through hole; the second steering gear 43 is arranged in the third through hole and the sixth through hole, as shown in fig. 11; part of the steel cable 5 passes through the first bracket 41 through the second steering gear 43 and then passes through the second bracket 42 through the fifth through hole; the other cables 5 pass through the first bracket 41 through the fourth through hole and then pass through the second bracket 42 through the second diverter 43. In the utility model, each third through hole is provided with a corresponding fifth through hole, and each fourth through hole is provided with a corresponding sixth through hole; the second diverter 43 is identical in construction to the first diverter 32; the second steering gear 43 comprises a second outer sleeve 431, a second through steel pipe 432 and a second steering pipe 433 matched with the second through steel pipe 432, wherein the second outer sleeve 431 is arranged in the third through hole or the sixth through hole, and the outer wall of the second outer sleeve 431 is fixedly connected with the hole wall of the third through hole or the sixth through hole; the second crossing sleeve is arranged in the second outer sleeve 431, and one end of the second crossing steel pipe 432 is bent downwards; the outer wall of the second pass-through steel pipe 432 may contact the inner wall of the second outer sleeve 431; the second steering pipe 433 is installed in the second crossing steel pipe 432, and epoxy iron sand is filled in a gap between the second steering pipe 433 and the second crossing steel pipe 432. In this embodiment, two bogies 4 are respectively provided on both sides of one support mechanism 12, and the second steering gears 43 on the bogies 4 on both sides of the support mechanism 12 have their obliquely bent ends facing away from each other, as shown in fig. 12 and 13. The first support 41 and the second support 42 have the same structure and respectively comprise a steel truss and a steel plate, wherein the steel truss is arranged in the box girder 11 of the bridge 1 and anchored with the box girder 11 of the bridge 1; the steel plate is detachably connected to the upper end of the steel truss through a bolt; each through hole is arranged on the first steel plate. In this embodiment, there are 6 steel cables 5, four third through holes and four fifth through holes are provided, two fourth through holes and two sixth through holes are provided, wherein the four steel cables 5 pass through the first bracket 41 via the second steering gear 43 in the four third through holes (each steel cable 5 passes through one second steering gear 43), and then pass through the second bracket 42 via the fifth through holes (each steel cable 5 passes through one fifth through hole); the other two cables 5 pass through the first bracket 41 by sliding through the fourth through hole and pass through the second bracket 42 by passing through the diverter in the sixth through hole.

Preferably, as shown in fig. 14, the steel cable 5 includes a sheath 51, a plurality of galvanized steel strands 52 and an anticorrosive filler 53, the sheath 51 is a hollow pipe, the plurality of galvanized steel strands 52 are arranged in the sheath 51 along the axial direction of the sheath 51, and the galvanized steel strands 52 are twisted with each other; the sheath 51 is filled with an anticorrosive filler 53. In this embodiment, the sheath 51 is made of PE.

Preferably, as shown in fig. 15 to 17, the damper 6 includes a fixing bracket 61 and a plurality of damper members 62, and the fixing bracket 61 is connected to the box girder 11; a damper 6 is arranged corresponding to a steel cable 5; the vibration damping piece 62 comprises a cable clamp and two arc-shaped damping rubber sheets, and the two damping rubbers are spliced and fixed in the cable clamp; the cable clamp is of a split structure and is detachably connected with each other up and down through a bolt by two half cable clamps. In this embodiment, the fixing bracket 61 is a supporting steel plate, and as shown in fig. 18 and 19, a plurality of supporting steel plates are parallel to each other and connected to the top of the inner wall of the box girder 11 at intervals, and the supporting steel plates and the box girder can be connected by adhesive steel glue.

The utility model discloses in, adopt many cable wires 5 to carry out the prestressing force reinforcement, the one end of cable wire 5 is connected in a fixed ground tackle 2, the other end warp first through-hole, second through-hole pass each turning block 31, bogie 4 in proper order, and the other end of cable wire 5 is connected in another fixed ground tackle 2, cable wire 5 butt in the inner wall and the cable wire 5 of first through-hole pass first through-hole department produces the bending that the opening faces upward, cable wire 5 butt in the inner wall and the cable wire 5 of second through-hole pass second through-hole department produces the bending that the opening faces down.

A construction method of an external prestress reinforcing device of a bridge 1 structure comprises the following steps:

firstly, determining the installation positions of the fixed anchorage devices 2 and the steering blocks 31, and forming a plurality of concrete pouring holes in a top plate of a box girder 11 of the bridge 1, wherein the concrete pouring holes are positioned above the corresponding fixed anchorage devices 2 and the corresponding steering blocks 31;

in this embodiment, the horizontal holes of the anchoring diaphragm 21 and the steering block 31 of the fixed anchor 2 are both formed on the basis of the horizontal center line of the bridge deck, and the concrete pouring holes are formed on the basis of the center line. Accurately setting out according to the actual situation of the site and the design requirements, determining the width of the slot, chiseling off the concrete of the box girder 11 by using an air compressor and an air pick after the line is bounced, and keeping the structural steel bar of the top plate of the box girder 11 until the requirement of the opening is met; during construction, the position of the box girder 11 top plate prestressed pipeline needs to be detected firstly, and the prestressed steel cable 5 is ensured not to be damaged during hole opening.

And step two, carrying out corresponding bar planting at the installation positions of the fixed anchorage device 2 and the steering block 31, and carrying out rust removal and corrosion prevention treatment on the steel structure of the bridge 1.

And determining the position of the prestressed steel bar at the steel bar planting part of the box girder 11, wherein an adhesive is used for pouring by adopting a special pouring device in the steel bar planting process, and the steel bar is inserted into the adhesive in a unidirectional rotating manner immediately after the adhesive is injected until the designed depth is reached.

The surface treatment of the steel structure of the bridge 1 before construction is carried out according to the steel surface rust and rust removal grade before coating (GB8923-88), and all the surface cleaning grades of the steel (sticking the supporting steel plate) are required to be not less than the Sa3 grade.

Step three, arranging ribs and installing the fixed anchorage device 2 and the template of the steering block 31: binding the steel bars at the installation positions of the fixed anchorage device 2 and the steering block 31 according to a preset design, and welding the steel bars and the embedded steel bars; when the steel bars are connected, binding lap joint and welding connection are adopted, the steel bar joints are preferably arranged at the positions with smaller stress, the joints are preferably arranged on the same steel bar less, and the longitudinal stress steel bar joints in the same component are staggered; the binding of the reinforcing steel bars adopts a No. 22 lead wire splayed buckle; and binding a mortar cushion block after the steel bars are bound, and controlling the thickness of the protective layer. Installing the template in the box girder 11 to ensure that the template encloses the shapes of the preset fixed anchorage device 2 and the preset steering block 31;

and step four, pouring and maintaining concrete in the template, and removing the template when the strength of the concrete in the template is more than 2.5 MPa. In the embodiment, the anchoring diaphragm plate 21 and the steering block 31 are made of C55 micro-expansion concrete; when the formwork is removed, attention is paid to protect concrete and prevent the surface from being damaged, the formwork needs to be inspected and maintained after being removed, and the concrete surface needs to be covered in time after the formwork is removed.

Step five, assembling the bogie 4 at a preset position in the box girder 11: the steel truss is sent to the interior setting position of box roof beam 11 and is assembled into bogie 4, is fixed in box roof beam 11 with bogie 4 in, the detailed process as follows:

a. lofting: and (5) performing size lofting on the material and the sample plate according to the design drawing requirements.

b. Surface treatment: and cleaning the floating soil and dust on the surface of the box girder 11 and performing chiseling treatment on the surface of the box girder 11.

c. Hoisting and assembling the components: the member is lifted into the box girder 11 for assembly, the steel truss is assembled in the box girder 11, and the assembled member is welded with the web steel plate.

The steel truss assembly is mainly high-strength bolt connection, after the high-strength bolt is finally screwed and checked to be qualified, plate seams at the connection part are sealed by putty in time, and exposed parts of the bolt, the nut and the washer are coated within a specified time. After the steel truss is assembled, welding can be started, and after field installation is completed, anticorrosion treatment is carried out on the structure.

Step six, threading the steel cable 5 according to a preset path: the steel cable 5 penetrates through the anchor backing plate 22f at one end, passes through the embedded pipe and each steering gear, finally enters the embedded pipe in the anchoring area at the other end, and penetrates out of the anchor backing plate 22f at the end.

6 steel cables 5 are arranged in the box girder 11, the tension control stress 837MPa is achieved, and two ends are symmetrically tensioned.

The construction of the anchoring block needs to pay attention to the pre-burying of embedded parts such as a steering pipe and an anchorage device 22, the positions of the embedded parts are determined according to design requirements, the center line of an anchor backing plate 22f is perpendicular to the center line of the steel cable 5, and the spiral rib 22b and the pre-buried sleeve are coaxial with the steel cable 55.

The tension tool equipment is matched with the anchorage device 22 for use, an YDC750 jack and a ZB4-500 oil pump are selected according to the type of the steel cable 5, and the tension tool equipment can be adjusted to the working table after the test run is ensured to be normal.

And (3) blanking, namely measuring the required blanking length along the line, placing the stranded wire disc on a paying-off base frame, walking to a marking line by utilizing manual traction, and then cutting off by using a grinding wheel cutting machine.

Peeling and cleaning, after finishing blanking of the steel cable 5, peeling off sheaths 5151 at two ends of the steel cable 5 according to a given length.

The process of threading and installing the steel cable 5 is as follows:

the unbonded steel cable 5 is cleaned hole by hole to ensure that each pore passage can pass through smoothly.

Installing a sealing device: and installing the sealing devices of the steering gears at the anchoring areas at the two ends of the steel cable 5. A PVC pipe having a size suitable for fitting the wire rope 5 is inserted into the sealing cylinder 22c as a guide pipe for reeving.

Step seven, installing a special jack, installing a tool anchor, calculating tension oil pressure values of all levels according to the designed tension force and a calibration equation of the jack, and calculating a theoretical elongation value of the steel cable 5 according to other parameters of the steel cable 5; when the steel cable 55 is tensioned by adopting a stress control method, the elongation value is checked, the difference value between the actual elongation value and the theoretical elongation value is controlled within +/-6%, otherwise, the tensioning is suspended, and the tensioning can be continued after the reason is found out and measures are taken for adjustment.

When the steel cord 55 is tensioned, the elongation is measured from the initial stress.

Tensioning sequence: tensioning is carried out in a left-to-right mode from top to bottom, and the tensioning procedure is as follows: 0 → 0.1 → 0.2 (hold load for 2min) → (hold load for 5min anchoring).

The anchor head is anticorrosive, and the anchor head pours anticorrosive grease according to the design requirement, and the oil filling equipment, the oil filling pipe are connected and are connected with the slip casting mouth on anchor slab 22e22e, then start the oil filling equipment, pour anticorrosive grease into the anchor head through the oil filling pipe.

Installing a protective cover 22l, and flatly cutting off redundant steel cables 5 at two ends of an anchor head by using a hand-held sand wheel machine; and (3) carrying out anti-corrosion treatment on the anchor head by using grease, then installing a protective cover 22l, and filling the grease.

Mounting the shock absorber 6; the damper 6 is installed in a predetermined design.

Step eight, repairing the box girder 11; and after all the constructions in the box girder 11 are finished, restoring the original reinforcing steel bars at the hole, increasing the density of the reinforcing steel bars on the top plate of the box girder 11 by planting the reinforcing steel bars, manufacturing and installing the reinforcing steel bars, and performing welding treatment.

And recovering concrete at the hole, and constructing by adopting C50 self-compacting concrete.

The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims (9)

1. An external prestress reinforcing device of a bridge structure is characterized by comprising two groups of fixed anchors, a plurality of steering assemblies, a plurality of steering frames, a shock absorber and a plurality of steel cables; each component is arranged in a box girder of the bridge along the central line of the width direction of the bridge and is respectively connected and fixed with the box girder; the two fixing anchors are respectively arranged at two ends of the box girder, the bogie, the steering assembly and the shock absorber are respectively symmetrically distributed in the box girder at intervals by taking the supporting mechanism of the bridge as a central shaft, and the bogie, the steering assembly, the shock absorber and the steering assembly are gradually far away from the supporting mechanism of the bridge; one end of the steel cable is fixed, and the other end of the steel cable penetrates through one of the fixing anchors, penetrates through all the components in the box girder in sequence, and penetrates out of the other fixing anchor and is fixed.

2. The external prestress reinforcement device of a bridge structure of claim 1, wherein the fixing anchors comprise an anchoring diaphragm plate and a plurality of anchors, the anchoring diaphragm plate is fixed on the cross section of the box girder, a first mounting hole is formed in the middle of the anchoring diaphragm plate, and first fixing holes are symmetrically formed in two sides of the first mounting hole; the anchorage device is arranged in the first fixing hole, and the steel cable penetrates into the anchorage device from the first fixing hole.

3. The external prestress reinforcement device of a bridge structure according to claim 2, wherein the anchor comprises a sealing cylinder and an embedded cylinder which are coaxial and are sequentially arranged from inside to outside, a wire separator which is hermetically connected with one end of the sealing cylinder, an anchor backing plate which is arranged at the other end of the sealing cylinder and is hermetically connected with the other end of the sealing cylinder, a fixing nut which is coaxial with the anchor backing plate and is sequentially arranged outside the anchor backing plate, and a protective cover; one end of the embedded cylinder penetrates out of a first fixing hole of the anchoring transverse partition plate, and an anchor plate is arranged between the other end of the embedded cylinder and the protective cover; the steel cable penetrates through an anchor backing plate of a fixing anchorage device at one end of the bridge, axially enters the sealing cylinder and penetrates out through the wire separator.

4. The external prestress reinforcing device of a bridge structure according to claim 3, wherein a spiral rib is sleeved outside the embedded cylinder and embedded in the anchoring diaphragm; the anchor backing plate and the embedded cylinder are coaxially arranged, and the anchor backing plate is fixedly connected with the anchoring diaphragm plate; the anchor plate is provided with a plurality of first penetrating holes, one ends of the first penetrating holes, which are far away from the sealing cylinder, are internally provided with working clamping pieces, and the working clamping pieces clamp the steel cable; the end part of the anchor plate is detachably connected with a fixing plate, and the inner side of the fixing plate is abutted against the working clamping piece; a first sealing ring and a second sealing ring are respectively arranged at two ends of the sealing cylinder, a second penetrating hole is formed in the first sealing ring, and the first sealing ring is connected with the anchor backing plate through a screw; the second sealing ring is provided with a third penetrating hole, and the first penetrating hole, the second penetrating hole and the third penetrating hole are coaxial.

5. The external prestress reinforcing device of a bridge structure according to claim 1, wherein the steering assembly comprises a steering block and a first steering gear, the steering block is fixedly connected with the box girder, the steering block is provided with a first through hole, the first through hole is positioned below the steering block, and the middle part of the steering block is further provided with a second mounting hole; the first steering gear is arranged in the first through hole; the first steering device comprises a first outer sleeve, a first through steel pipe and a first steering pipe matched with the first through steel pipe, the first outer sleeve is arranged in the first through hole, and the outer wall of the first outer sleeve is fixedly connected with the hole wall of the first through hole; the first crossing sleeve is arranged in the first outer sleeve, and one end of the first crossing steel pipe is bent upwards in an inclined manner; the outer wall of the first penetrating steel pipe can be contacted with the inner wall of the first outer sleeve; the first steering pipe is installed in the first penetrating steel pipe, and epoxy iron sand is filled in a gap between the first steering pipe and the first penetrating steel pipe.

6. The external prestressed reinforcement of bridge construction according to claim 1, characterized in that said bogies are connected to the box girder and symmetrically arranged on both sides thereof near the supporting means; the bogie comprises a first bracket, a second bracket and a second steering gear, wherein the first bracket and the second bracket are respectively connected with the box girder; the second bracket is provided with a fifth through hole which corresponds to and is coaxially arranged with the third through hole and a sixth through hole which corresponds to and is coaxially arranged with the fourth through hole; the second steering gear is arranged in the third through hole and the sixth through hole, and part of the steel cable passes through the first bracket through the second steering gear and then passes through the second bracket through the fifth through hole; other steel cables pass through the first support through the fourth through hole and then pass through the second support through the second steering gear.

7. The external prestress reinforcing device of a bridge structure of claim 6, wherein the second steering device comprises a second outer sleeve, a second through steel pipe and a second steering pipe matched with the second through steel pipe, the second outer sleeve is arranged in the third through hole or the sixth through hole, and the outer wall of the second outer sleeve is fixedly connected with the wall of the third through hole or the sixth through hole; the second crossing sleeve is arranged in the second outer sleeve, and one end of the second crossing steel pipe is bent downwards; the outer wall of the second penetrating steel pipe can be contacted with the inner wall of the second outer sleeve; the second steering pipe is arranged in the second penetrating steel pipe, and epoxy iron sand is filled in a gap between the second steering pipe and the second penetrating steel pipe; two sides of one supporting mechanism are respectively provided with a bogie, and the inclined bent ends of the second steering gears on the bogies on the two sides of the supporting mechanism are deviated from each other.

8. The external prestressed reinforcement of claim 1, wherein said vibration damper comprises a fixed bracket and a plurality of vibration dampers, said fixed bracket is connected to the box girder; each shock absorber is arranged corresponding to one steel cable; the vibration damping piece comprises a cable clamp and two arc-shaped damping rubber sheets, and the two damping rubbers are spliced and fixed in the cable clamp; the cable clamp is of a split structure and is detachably connected with each other up and down through a bolt by two half cable clamps.

9. The external prestress reinforcing device of a bridge structure according to claim 1, wherein the steel cable comprises a sheath, a plurality of galvanized steel strands and an anticorrosive filler, the sheath is a hollow pipe body, the plurality of galvanized steel strands are arranged in the sheath along the axial direction of the sheath, and the galvanized steel strands are twisted with each other; the sheath is filled with antiseptic filler.

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