The widening structure of the new and old bridges adapted to multi-directional displacement

Abstract

A new and old bridge widening structure adapting to multi-directional displacement belongs to bridge construction technology; it includes an anchoring structure and a block simply supported steel plate beam spanning structure arranged on the new and old bridges; expansion joints are arranged between the block simply supported steel plate beam spanning structures; the anchoring structure is an inverted L-shaped steel or welded steel plate with a comb-shaped tooth plate; a supporting bracket device is arranged at the lower part of the anchoring structure; the simply supported steel plate beam spanning structure includes a comb-shaped tooth plate steel plate with comb-shaped tooth plates matching the anchoring structure at both ends, the comb-shaped tooth plate steel plate is provided with two transverse steel ribs and a stiffening steel plate along the bridge direction, and a movable support mechanism is arranged under the two transverse steel ribs. The present invention adopts a longitudinal modular block simply supported steel plate beam spanning structure and a support system suitable for multi-directional displacement, which can adapt to the vertical flexural deformation difference and longitudinal deformation, transverse deformation, torsional deformation of curved beams and single-support beams caused by the different stiffness of the new and old bridges, and can be quickly constructed and replaced.

Description

Technical field:

[0001] The invention relates to a new and old bridge widening structure adapting to multi-directional displacement, which belongs to the technical field of bridge construction, in particular to the technical field of widening and splicing of old bridges for upgrading and reconstruction. Background technology:

[0002] At present, when widening old bridges, the same structural type and span are usually adopted, and the upper main beam is widened without considering the connection of the lower structure. The main issues to be considered are to minimize the increase of vehicle load on the existing bridge and the additional load caused by the incoordination of the deformation of the new and old bridges. At the same time, the durability of the joints and driving smoothness should also be considered. There are three basic types of main beam widening structures: no connection between the new and old bridges, hinged connection, and rigid connection.

[0003] Under the control of the intersection conditions, the widening method of the new and old bridges with the same structure type and span can no longer meet the needs. There are many problems in the widening design. It is urgent to find a widening solution for the new and old bridges that can adapt to multi-directional displacement, meet the driving comfort and safety requirements of high-grade roads, can be quickly constructed, is durable and easy to maintain. At present, the following solutions have appeared in the existing technology:

[0004] Case 1: The invention patent application entitled "Articulated Structure and Construction Method for Bridge Widening" with application number CN202010904585.5 (referred to as comparative document 1) discloses a simple and safe articulated structure for bridge widening and its construction method. It includes: installing a hinge seat on the edge of the new bridge, pre-threading reinforcement above the hinge seat so that the second hinge seat can be supported, and then the hanging wire on the second hinge seat is pulled up with the lap rod. Plant reinforcement at the chiseled part of the old bridge and connect it to the pull plate on the second hinge seat to complete the hinged splicing of the new and old bridges. After that, there is still a gap between the new and old bridges, which needs to be filled with templates. The demand for templates is small, which avoids economic waste; the hinge seat and other components are connected with high-strength bolts, which makes the construction faster and more convenient, and less affected by the weather.

[0005] Case 2: The invention patent application entitled "A bridge widening structure and construction method that meets the settlement difference between the new and old bridges" with application number 201811106984.6 (hereinafter referred to as comparative document 2) discloses a bridge widening structure and construction method that meets the settlement difference between the new and old bridges. The bridge widening structure includes an old bridge, a new bridge, angle steel and connectors; the connectors include connecting steel plates, embedded steel bars, embedded steel plates, bolt connection components and isolation layers; the bolt connection components include screw rods, nuts I, nuts II and pads; round-end rectangular holes are opened on the embedded steel plates; and a longitudinal seam along the bridge direction is formed between the old bridge and the new bridge. The present invention has a simple structure, reasonable design, and is safe and reliable. The new bridge and the old bridge are fixedly connected together by a connecting piece, and a round-ended rectangular hole for the bolt connection assembly to move up and down is provided on the embedded steel plate. This can not only meet the vertical settlement difference between the new and old bridges, but also ensure the bridge widening structure in which the new and old bridges are firmly connected in the longitudinal and transverse directions of the bridge, and can effectively avoid cracking and damage to the upper structure beam and the bridge pavement layer caused by the settlement difference between the new and old bridges.

[0006] Case 3: The invention patent application entitled "A new structural system for the joints of new and old bridges" with application number CN201721056126.6 (hereinafter referred to as comparative document 3) discloses a new structural system for the joints of new and old bridges, which is mainly composed of a new bridge deck, an old bridge deck, extended steel bars, T-shaped steel plates, prestressed tendons, anchors and micro-expanded steel fiber fast-hardening sulphoaluminate cement concrete. The T-shaped steel plates are welded to the extended steel bars of the new and old bridge decks in sequence; the prestressed tendons pass through the reserved prestressed tendon holes on the T-shaped steel plates, and then prestress is applied at both ends and anchored with anchors; finally, micro-expanded steel fiber fast-hardening sulphoaluminate cement concrete is poured in the joints of the new and old bridges. The new structural system of the joints between the new and old bridges disclosed by the utility model can ensure a better connection between the new and old bridge decks and the joint concrete, and overcome the transverse tensile stress that causes longitudinal cracks by pre-applying corresponding pre-stress in the joints. In addition, the structural system can better integrate the new and old bridges, is simple to construct, has a short construction period, overcomes the settlement difference between the new and old bridges, and has good economic benefits.

[0007] Case 4: The invention patent application entitled "A Bridge Width Adaptive Joint System" with application number CN201920842694.1 (hereinafter referred to as comparative document 4) relates to a bridge width adaptive joint system, including an old bridge, a new bridge, a splicing gap, a new bridge deck pavement layer, and a plurality of X-hinge bars arranged at intervals along the length direction of the splicing gap. The old bridge and the new bridge are connected transversely through the splicing gap, and the new bridge deck pavement layer is laid above the new bridge, the splicing gap, and the old bridge; the intersection of the X-hinge bars is aligned with the center line of the splicing gap up and down, and the upper ends of both sides are respectively welded to the transverse steel bars in the new bridge deck pavement layer, the lower end of one side is welded to the transverse steel bars on the top layer of the bridge flange plate of the old bridge, and the lower end of the other side is welded to the transverse steel bars on the top layer of the bridge flange plate of the new bridge. The utility model adaptively adjusts the transverse bridge height difference generated when the new bridge and the old bridge are spliced, thereby improving the driving comfort of the bridge deck and the durability of the pavement at the splicing gap.

[0008] Case 5: The invention patent application entitled "Modular comb plate multi-directional displacement bridge expansion device and its installation method", application number CN201110125568.2 (hereinafter referred to as comparative document 5), belongs to the technical field of bridge expansion devices, and specifically relates to a modular comb plate multi-directional displacement bridge expansion device and its installation method. The existing technology cannot meet the displacement of the bridge when the longitudinal, transverse and vertical forces are twisted at the same time. The technical solution adopted by the present invention is: a modular comb plate type multi-directional displacement bridge expansion device, including a cross-slot movable comb plate and a fixed comb plate, a displacement box is horizontally arranged at the lower end of the cross-slot movable comb plate, and a movable gap is arranged between the upper end surface of the displacement box and the cross-slot movable comb plate; the displacement box includes an upper opening box body, and the box body includes a multi-directional displacement device arranged in the middle and displacement connection devices on both sides, and the multi-directional displacement device includes an upper connection block and a lower connection block with a concave spherical surface and a convex spherical surface nested and slidably matched, the upper connection block is fixedly connected to the cross-slot movable comb plate, and the lower connection block is fixedly connected to the bottom plate of the displacement box. The present invention can meet the multi-directional displacement of the bridge.

[0009] Case 6: The invention patent application entitled "A multi-directional displacement bridge expansion joint device" with application number 202010810978.X (hereinafter referred to as comparative document 6) discloses a multi-directional displacement bridge expansion joint device, including a span plate and a fixed plate matched with the span plate, characterized in that: a fixed bottom plate for fixing to the end of the beam is provided below the span plate, a sliding member capable of relative lateral movement is provided between the span plate and the fixed bottom plate, and a rotating member is also installed between the span plate and the fixed bottom plate to enable the fixed bottom plate and the span plate to be relatively twisted, relatively horizontally rotated, and relatively longitudinally rotated. The advantage of the present invention is that the multi-directional displacement bridge expansion joint device can simultaneously have the functions of lateral displacement, longitudinal displacement, horizontal rotation angle, vertical rotation angle, and torsion by arranging sliding members and rotating members between the span plate and the fixed bottom plate. When earthquakes and strong winds come, the combination of these functions can effectively resolve the comprehensive displacement requirements of the bridge in the horizontal, longitudinal, vertical, torsion and other directions, and fully improve the safety of bridge traffic.

[0010] Although the above cases have solved some problems of the prior art, the following problems still exist:

[0011] The schemes of Comparative Documents 1 and 4 have the following disadvantages: 1) The hinged connection between the new and old bridges cannot meet the needs of large deformation differences between different spans and different structural types; 2) The post-cast hinged joint concrete is easily damaged by the impact of vehicle dynamic loads; 3) The anchoring construction of the scheme of Comparative Document 1 is difficult, the anchoring conditions are insufficient, and safety is difficult to ensure; 4) It is not convenient for quick replacement.

[0012] Comparative Document 2 has the following disadvantages: 1) It can adapt to the vertical differential deformation between the new and old bridges. When the spans and structural types of the new and old bridges are different, there will be obvious bumps when this solution is adopted. Cars will jump when driving through the gaps, affecting driving comfort, posing traffic safety hazards and causing high traffic noise; 2) It cannot adapt to the needs of multi-directional displacement between the new and old bridges. When there is relative torsional deformation, the structure is easily damaged; 3) The spliced ​​structure is located below the bridge deck, which is not convenient for inspection and replacement.

[0013] Comparative Document 3 has the following shortcomings: 1) A rigid connection is used between the new and old bridges, and prestressing in the joints can avoid cracking of the joints, but the differential deformation between the new and old bridges will produce additional effects, requiring a comprehensive analysis and evaluation of the old bridge and necessary reinforcement; 2) This solution is not applicable when the spans and structural types of the new and old bridges are quite different.

[0014] Comparative Document 5 and Comparative Document 6 are both solutions for transverse expansion joints of bridges. They have the following disadvantages when used as longitudinal joints for splicing new and old bridges: 1) They can adapt to small multi-directional displacements, but cannot adapt to larger vertical displacements; 2) Transverse expansion joints and longitudinal deformation joints are different in deformation characteristics and structural force requirements, and transverse expansion joints do not take into account the structural force requirements between the new and old bridges.

[0015] Obviously, the above-mentioned solutions for handling the joints of the new and old bridges are only suitable for the conventional width of the bridge, and cannot effectively solve the problem of large vertical difference deformation when the span and structure type are different when the new and old bridges are joined. The use of transverse expansion joints for the longitudinal joints of bridges does not conform to the deformation and structural stress characteristics of the joints, and also cannot be used for the joints of the new and old bridges with large vertical difference deformation when the span and structure type are different. The above-mentioned existing technologies have not solved the problem of driving smoothness when the longitudinal joints have large vertical deformation. Summary of the invention:

[0016] The purpose of the present invention is to provide a new and old bridge widening structure that can not only adapt to the vertical flexural deformation difference caused by the different stiffness of the new and old bridges, but also adapt to multi-directional differential deformations such as longitudinal deformation, lateral deformation, torsional deformation of curved beams and single-support beams, and can adapt to multi-directional displacement.

[0017] The object of the present invention is achieved in that:

[0018] A new and old bridge widening structure adapting to multi-directional displacement, comprising an anchoring structure and a block simply supported steel plate beam spanning structure arranged on the new and old bridges, and corresponding tooth grooves adapting to multi-directional displacement are reserved between the anchoring structure and the simply supported steel plate beam spanning structure; expansion joints are arranged between the block simply supported steel plate beam spanning structures; the anchoring structure is an inverted L-shaped steel or welded steel plate with a comb-shaped tooth plate; a supporting bracket device is arranged at the lower part of the anchoring structure; the simply supported steel plate beam spanning structure comprises a steel plate with comb-shaped tooth plates matching the anchoring structure at both ends, and the comb-shaped tooth plate steel plate Two transverse steel ribs and stiffening steel plates in the longitudinal direction of the bridge are provided, and a movable support mechanism is provided under the two transverse steel ribs; hoisting holes are symmetrically provided on the comb-shaped tooth plate steel plate, and safety anchor cables for hoisting supporting corbel devices are hoisted on the hoisting holes; the supporting corbel device comprises a pair of corbel steel plates connected to the comb-shaped tooth plate steel plate, an inner stiffening plate and two outer stiffening plates are provided between the two corbel steel plates, and hole grooves for hooking safety anchor cables are provided on the outer stiffening plates; the corbel steel plate is located below the mounting support at the bottom of the movable support mechanism.

[0019] The movable support mechanism comprises a support body, and the support body is placed in a limiting groove with a water discharge notch; the limiting groove is installed on the mounting support.

[0020] A support upper cover plate is also arranged on the upper part of the support body, and the support upper cover plate is fixedly connected to two transverse steel ribs; a stainless steel plate is fixed below the support upper cover plate.

[0021] The support body is a polytetrafluoroethylene rubber support or a spherical steel support that can adapt to multi-directional displacement.

[0022] A lower pad is arranged under the lifting hole.

[0023] A guide plate is arranged below the comb-shaped tooth plate steel plate.

[0024] The anchoring structure is connected with a U-shaped water collecting trough.

[0025] The safety anchor cable is a high-strength steel wire rope, and a lifting ring is arranged at the lower end, and the lifting ring is clamped in the hole groove.

[0026] The present invention adopts a longitudinal modular block-based simply supported steel plate beam span structure and a support system suitable for multi-directional displacement. It can not only adapt to the vertical flexural deformation difference caused by the different stiffness of the new and old bridges, but also adapt to multi-directional differential deformations such as longitudinal deformation, lateral deformation, torsional deformation of curved beams and single-support beams, and achieve rapid construction and rapid replacement. Description of the drawings:

[0027] Figure 1 This is a schematic plan view of the widening structure of the new and old bridges of the present invention;

[0028] Figure 2 For the present invention Figure 1 AA section view

[0029] Figure 3 For the present invention Figure 1 BB cross-section view

[0030] Figure 4 Schematic diagram of the cross-joint structure of the block simply supported steel plate beam of the present invention

[0031] Figure 5 For the present invention Figure 4 Bottom view

[0032] Figure 6 Schematic diagram of the safety anchor cable of the present invention

[0033] Figure 7 This is a horizontal displacement state diagram of the new and old bridges of the present invention.

[0034] Figure 8 This is a longitudinal displacement state diagram of the new and old bridges of the present invention. Specific implementation method:

[0035] Combine the following Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , the present invention is further described:

[0036] The basic design idea of ​​the present invention is:

[0037] Firstly, the corresponding span of the gap is adopted according to the calculated value of the vertical flexural deformation of the new and old bridges, and the transverse slope caused by the vertical differential deformation of the new and old bridges is controlled to ensure smooth driving across the gap. Secondly, according to the plane geometric structure, support system and deformation characteristics of the new and old bridges, the corresponding deformation amount is selected by calculating the deformation parameters in all directions.

[0038] An anchor structure is designed and installed on the new and old bridges, leaving corresponding tooth grooves between the anchor structure and the simply supported steel plate girder span structure to accommodate multi-directional displacement.

[0039] A supporting corbel device is installed on the anchoring structure, a movable bearing mechanism that can adapt to multi-directional displacement is installed on the supporting corbel device, and an upper cover plate and a stainless steel plate of the bearing body are installed at corresponding positions on the lower part of the simply supported steel plate beam cross-slot structure to form a sliding surface.

[0040] Based on the above design concept, the following specific structural design is made:

[0041] In this embodiment, the present invention includes two parts: the first is an anchoring structure set on the new and old bridges, and the second is a block-type simply supported steel plate beam spanning structure, and corresponding comb-shaped tooth grooves are left between the anchoring structure and the simply supported steel plate beam spanning structure to adapt to multi-directional displacement. Figure 1 and Figure 4 As shown in Figure 1 The middle block simply supported steel plate beam span structure is composed of two Figure 4 It is composed of the simply supported steel plate beam spanning joint structural units. This combination is flexible and convenient, and can be combined and spliced ​​according to the actual situation of the bridge.

[0042] The block simply supported steel plate beam cross-joint structure is provided with expansion joints between them to adapt to the horizontal strain. In actual implementation, the gaps in each direction should be determined according to the structural deformation calculation when necessary and a certain amount of surplus should be left. In this embodiment, the expansion joints are filled with tst viscoelastic joint material on the steel cover plate.

[0043] The anchoring structure 4 is an inverted L-shaped steel or welded steel plate with a comb-shaped tooth plate; a supporting bracket device is arranged at the lower part of the anchoring structure.

[0044] The simply supported steel plate beam cross-slot structure includes a comb-shaped tooth plate steel plate 3 with two ends matched with the anchor structure 4, and the comb-shaped tooth plate steel plate 3 is provided with two transverse steel ribs 32 and a stiffening steel plate 2 in the bridge direction, and a movable support mechanism is provided under the two transverse steel ribs 32. The movable support mechanism includes a support body 6. In this embodiment, the support body 6 is a polytetrafluoroethylene rubber support or a ball steel support that can adapt to multi-directional displacement. The polytetrafluoroethylene rubber support and the ball steel support can be used in the prior art.

[0045] The support body 6 is placed in a limiting groove 61 with a drain notch; the limiting groove 61 is installed on a mounting support 64. A support upper cover plate 63 is also provided on the upper part of the support body 6, and the support upper cover plate 63 is fixedly connected to two transverse steel ribs 32.

[0046] A stainless steel plate 62 is fixed below the support upper cover plate 63 to form a sliding surface.

[0047] The supporting corbel device comprises a pair of corbel steel plates 8 connected to a comb-shaped tooth plate steel plate 3, an inner stiffening plate 81 and two outer stiffening plates 82 are arranged between the two corbel steel plates 8, and holes 83 for hooking the safety anchor cable 5 are arranged on the two outer stiffening plates 82; the corbel steel plates 8 are located below the mounting support 64 at the bottom of the movable support mechanism.

[0048] The comb-shaped tooth plate steel plate 3 is symmetrically provided with hoisting holes 31, and a bottom pad 33 is provided under the hoisting holes 31. The safety anchor cable 5 used for hoisting the supporting corbel device is hoisted on the hoisting hole to prevent the jump of the cross-slot structure of the simply supported steel plate beam and possible abnormal displacement. In this embodiment, the safety anchor cable 5 is a high-strength steel wire rope, and a lifting ring 51 is provided at the lower end, and the lifting ring is stuck in the hole groove 83. In this embodiment, the hole groove 83 is an arc-shaped hole groove, which serves as the lower anchor point of the safety anchor cable 5 and also has the function of preventing the safety anchor cable 5 from falling.

[0049] In this embodiment, a guide plate 20 is provided below the comb-shaped tooth plate steel plate 3, and a U-shaped water collecting trough 9 is connected to the anchor structure 4. The guide plate 20 and the U-shaped water collecting trough 9 constitute the drainage structure of the present invention.

[0050] In the implementation of this embodiment, the anchor structure 4 is welded to the anchors buried in the new and old bridges in the prior art. In the concrete beam, the anchor is a steel bar assembly, and the anchor is tied or welded to the steel bars in the concrete beam to ensure effective connection before pouring high-performance concrete to complete the anchoring; in the steel structure beam, the anchor is a steel component, which is welded to the flange of the main beam to form an anchor. This anchor structure can adapt to the splicing between concrete beams and concrete beams, steel structure beams and steel structure beams, and concrete beams and steel structure beams.

[0051] like Figure 1 , Figure 7 and Figure 8 As shown in the figure, the existing bridge flange 111 and the newly built bridge flange 112 formed of high-performance concrete 1 are connected to the anchoring structure 4 of the present invention by means of anchoring pieces 10, and the basic splicing of the present invention is achieved by the meshing of the anchoring structure 4 and the comb-shaped toothed plate steel plate 3 of the simply supported steel plate beam span structure. After the meshing of the comb-shaped toothed plate steel plate 3 and the comb-shaped toothed plate of the anchoring structure 4, it is ensured that a comb-shaped deformation joint 114 is left. In this embodiment, the block simply supported steel plate beam span structure includes two simply supported steel plate beam span structure units, and an expansion joint 113 is arranged between the two simply supported steel plate beam span structure units; after splicing, a splicing joint center line 115 is generated.

[0052] The movable support mechanism and the supporting bracket device realize the support system in the Z direction of the present invention and adapt to multi-directional displacement.

Claims

1. A new and old bridge widening structure adapting to multi-directional displacement, comprising an anchoring structure and a block simply supported steel plate beam spanning structure arranged on the new and old bridges, and corresponding tooth grooves adapting to multi-directional displacement are reserved between the anchoring structure and the simply supported steel plate beam spanning structure; expansion joints are arranged between the block simply supported steel plate beam spanning structures; the anchoring structure (4) is an inverted L-shaped steel or welded steel plate with a comb-shaped tooth plate; a supporting bracket device is arranged at the lower part of the anchoring structure; the simply supported steel plate beam spanning structure comprises a comb-shaped tooth plate steel plate (3) with comb-shaped tooth plates matching the anchoring structure at both ends, and the comb-shaped tooth plate steel plate (3) is provided with two transverse steel ribs (32) and a stiffening steel plate (3) along the bridge direction. 2), a movable support mechanism is arranged under the two transverse steel ribs (32); hoisting holes (31) are symmetrically arranged on the comb-shaped tooth plate steel plate (3), and a safety anchor cable (5) for hoisting a supporting corbel device is hoisted on the hoisting holes; the supporting corbel device comprises a pair of corbel steel plates (8) connected to the comb-shaped tooth plate steel plate (3), an inner stiffening plate (81) and two outer stiffening plates (82) are arranged between the two corbel steel plates (8), and a hole groove (83) for hooking the safety anchor cable (5) is arranged on the outer stiffening plate (82); the corbel steel plate (8) is located below the mounting support (64) at the bottom of the movable support mechanism.

2. The new and old bridge widening structure adapted to multi-directional displacement as claimed in claim 1 is characterized in that The movable support mechanism comprises a support body (6), wherein the support body (6) is placed in a limiting groove (61) with a water drainage notch; the limiting groove (61) is installed on a mounting support (64).

3. The new and old bridge widening structure adapting to multi-directional displacement as claimed in claim 2 is characterized in that A support upper cover plate (63) is also provided on the upper part of the support body (6), and the support upper cover plate (63) is fixedly connected to two transverse steel ribs (32); a stainless steel plate (62) is fixed below the support upper cover plate (63).

4. The new and old bridge widening structure adapting to multi-directional displacement as claimed in claim 2 or 3, characterized in that The support body (6) is a polytetrafluoroethylene rubber support or a spherical steel support that can adapt to multi-directional displacement.

5. The new and old bridge widening structure adapting to multi-directional displacement as claimed in claim 1 is characterized in that A lower pad (33) is arranged under the lifting hole (31).

6. The new and old bridge widening structure adapting to multi-directional displacement as claimed in claim 1 is characterized in that A guide plate (20) is arranged below the comb-shaped tooth plate steel plate (3).

7. The new and old bridge widening structure adapting to multi-directional displacement as claimed in claim 1 is characterized in that The anchoring structure (4) is connected to a U-shaped water collecting trough (9).

8. The new and old bridge widening structure adapting to multi-directional displacement as claimed in claim 1, characterized in that The safety anchor cable (5) is a high-strength steel wire rope, and a lifting ring (51) is arranged at the lower end, and the lifting ring is clamped in the hole groove (83).

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