Expansion joint structure of bridge approach slab back wall and beam slab

Abstract

An expansion joint structure of a bridge butt strap back wall and a beam plate comprises side steel beams, anchor plates, anchor bars and elastic sealing strips. Steel bar frameworks are arranged at the first notches and the second notches; a group of anchor plates are arranged on each steel reinforcement framework at intervals in the transverse bridge direction, and the anchor plates are connected with the steel reinforcement frameworks through anchor bars; the two side steel beams are arranged above the two anchor plates in the transverse bridge direction, and the bottoms of the side steel beams are connected with the corresponding anchor plates in a welded mode. The tops of the side steel beams exceed the top surfaces of the cross beams and the top surfaces of the lapping plates; clamping grooves are formed in the sides, facing the joints, of the edge steel beams; the elastic sealing strip is arranged on the upper portion of the joint, and the two side edges of the elastic sealing strip are embedded in the clamping grooves respectively. And concrete layers are poured at the first notch and the second notch. The expansion joint structure solves the problems that a traditional expansion joint structure is prone to causing aging or pulling damage of filling materials or sealants, and water permeation is caused; repair and maintenance are troublesome, and construction difficulty and cost may be increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, in particular to a telescopic joint structure between the back wall of a bridge approach slab and a beam slab. Background Technique

[0002] The traditional telescopic joint structure between the back wall and the beam slab usually includes a gap, filling material, waterstop and gap sealant, etc. During construction, a gap is left between the beam slab and the back wall to allow the structure to expand and contract freely when the temperature or load changes. Then an elastic material (such as rubber, asphalt or foam material) is used to fill the gap to prevent moisture and dust from entering, and at the same time maintain a certain elasticity to adapt to deformation. At the same time, a waterstop is arranged in the gap to prevent moisture penetration and protect the interior of the structure from moisture. After the components in the joint are constructed, sealant is often used for sealing to ensure the integrity and durability of the structure. However, this telescopic joint structure has the following defects: the deformation amount allowed by this joint structure is small, which easily causes the filling material or sealant to age or be damaged, thus causing moisture penetration, and the construction process of the sealant is relatively complex; in addition, the repair and maintenance of this structure are troublesome, which may increase the construction difficulty and cost. Content of the Utility Model

[0003] The purpose of the utility model is to provide a telescopic joint structure between the back wall of a bridge approach slab and a beam slab, and solve the technical problems that the traditional telescopic joint structure allows a small deformation amount, resulting in the aging or damage of the filling material or sealant, thus causing moisture penetration; and the repair and maintenance of this structure are troublesome, which may increase the construction difficulty and cost.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions.

[0005] A telescopic joint structure between the back wall of a bridge approach slab and the beam slab, which is arranged at the joint between the back wall and the cross beam; the top surface of the cross beam exceeds the top surface of the back wall, and a first notch is arranged along the transverse direction of the bridge at the top of one end of the cross beam close to the back wall; a slab is laid on the top of the back wall, on the side far from the cross beam, and there is a spacing between the end of the slab and the corresponding side surface of the back wall, and the top of the slab exceeds the top surface of the back wall; the part of the slab exceeding the top surface of the back wall and the top surface of the back wall together form a second notch; it includes side steel girders, anchor plates, anchor bars and elastic sealing strips; steel bar skeletons are arranged at both the first notch and the second notch; the steel bar skeletons are arranged along the transverse direction of the bridge, the lower part of the steel bar skeletons is buried in the cross beam or the back wall, and the upper part of the steel bar skeletons is located in the first notch or the second notch; a group of anchor plates are arranged at intervals along the transverse direction on each steel bar skeleton, and the anchor plates are connected to the steel bar skeletons through anchor bars; there are two side steel girders, which are respectively arranged transversely above the two groups of anchor plates, and the bottom of the side steel girders is welded to the corresponding group of anchor plates; the side surface of the side steel girder close to the joint is vertically flush with the side surface of the corresponding back wall or cross beam, and the top of the side steel girder exceeds the top surface of the cross beam and the top surface of the slab; a clamping groove is arranged on the side of the side steel girder facing the joint; the elastic sealing strip is arranged at the upper part of the joint, and both side edges of the elastic sealing strip are respectively embedded in the clamping groove; a concrete layer is poured at the first notch and the second notch, and the top surface of the concrete layer is flush with the top surface of the side steel girder, and the side surface of the concrete layer is vertically flush with the side surface of the corresponding back wall or cross beam.

[0006] Preferably, a corbel is arranged on the side of the back wall close to the slab; the slab is lapped on the corbel, and a chamfer is arranged along the transverse direction of the bridge on the outer side of the top of the corbel; a flexible cushion layer is laid between the slab and the corbel.

[0007] Preferably, the anchor bar is triangular, the lower part of the anchor bar is hoop-shaped outside the upper layer of steel bars of the steel bar skeleton, and the upper end of the anchor bar is welded to the corresponding anchor plate.

[0008] Preferably, the elastic sealing strip is composed of two arc-shaped strips spliced together, the longitudinal section of the arc-shaped strip is arc-shaped, and a clamping edge is arranged on the side of the arc-shaped strip close to the clamping groove; the clamping edge is embedded in the clamping groove.

[0009] Preferably, the side steel girder includes a bottom plate and a vertical plate; the bottom plate is welded along the transverse direction to the top of a group of anchor plates; the vertical plate is connected to the top of the bottom plate, on the side close to the joint, and a connecting strip is arranged on the upper part of the vertical plate, on the side close to the joint; the clamping groove is arranged on the connecting strip.

[0010] Preferably, the height of the part of the steel bar skeleton extending into the first notch or the second notch is not less than 250 mm; a steel bar mesh is arranged at the upper part of the concrete layer, close to the top surface position.

[0011] Compared with the prior art, the utility model has the following characteristics and beneficial effects.

[0012] 1. The expansion joint structure of the utility model includes side steel girders, anchor plates, anchor bars and elastic sealing strips. Among them, the side steel girders are connected to the anchor plates through anchor bars, and the lower part of the anchor bars is hoop-shaped outside the upper layer of steel bars of the steel bar framework. The design of this structure enhances the integrity and stability of the structure, ensures good connection between the side steel girders and the back wall and cross beam, and also effectively avoids reducing the potential slip risk during the use of the side steel girders.

[0013] 2. The utility model respectively sets side steel girders on both sides of the joint, and there are card slots on the side of the side steel girders facing the joint. Both sides of the elastic sealing strip located between the two side steel girders are respectively stuck in the card slots. The design of this structure effectively prevents water from entering the joint, reduces the damage caused by water damage and freeze-thaw cycle of concrete, simplifies the construction and improves the construction efficiency, and also ensures the connection reliability of the structure. In addition, the connection method of the elastic sealing strip takes into account the possible future maintenance needs, making maintenance and repair more convenient.

[0014] 3. In the utility model, the elastic sealing strip is spliced by two arc-shaped strips, and the longitudinal section of the arc-shaped strip is arc-shaped. This structural design of the elastic sealing strip allows it to have a large range of elongation or shortening, and can allow a relatively large deformation amount of the expansion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following further describes the utility model in detail with reference to the drawings.

[0016] Figure 1 is a longitudinal sectional schematic view of the expansion joint structure of the utility model.

[0017] Figure 2 is a schematic view of the connection structure between the side steel girder and the anchor plate in the utility model.

[0018] Figure 3 is a schematic view of the structure of the joint provided between the back wall and the cross beam in the utility model.

[0019] Figure 4 is a schematic view of the structure of the elastic sealing strip in the utility model.

[0020] Reference numerals: 1 - back wall, 2 - cross beam, 3 - first notch, 4 - bridging slab, 5 - second notch, 6 - side steel beam, 6.1 - bottom plate, 6.2 - vertical plate, 6.3 - connecting bar, 7 - anchor plate, 8 - anchor bar, 9 - elastic sealing strip, 9.1 - arc strip, 10 - steel bar framework, 10.1 - upper layer of steel bars, 10.2 - lower layer of steel bars, 10.3 - stirrup, 11 - clamping groove, 12 - concrete layer, 13 - corbel, 14 - chamfer, 15 - flexible cushion layer, 16 - deck surfacing, 17 - clamping edge, 18 - steel bar mesh, 19 - bridge deck surfacing. Detailed implementation manner

[0021] As Figures 1-4 shown, this expansion joint structure between the back wall of the bridge bridging slab and the beam slab is arranged at the joint between the back wall 1 and the cross beam 2; the top surface of the cross beam 2 exceeds the top surface of the back wall 1, and a first notch 3 is arranged along the transverse direction of the bridge at the top of one end of the cross beam 2 close to the back wall 1; a bridging slab 4 is laid on the top of the back wall 1, on the side far from the cross beam 2, and there is a spacing between the end of the bridging slab 4 and the corresponding side surface of the back wall 1, and the top of the bridging slab 4 exceeds the top surface of the back wall 1; the part where the bridging slab 4 exceeds the top surface of the back wall 1 and the top surface of the back wall 1 together form a second notch 5; it includes side steel beams 6, anchor plates 7, anchor bars 8 and elastic sealing strips 9; steel bar frameworks 10 are arranged at both the first notch 3 and the second notch 5; the steel bar frameworks 10 are arranged along the transverse direction of the bridge in a continuous length, the lower part of the steel bar frameworks 10 is buried in the cross beam 2 or the back wall 1, and the upper part of the steel bar frameworks 10 is located in the first notch 3 or the second notch 5; a group of anchor plates 7 are arranged at intervals along the transverse direction on each steel bar framework 10, and the anchor plates 7 are connected to the steel bar frameworks 10 through anchor bars 8; there are two side steel beams 6, which are respectively arranged transversely above two groups of anchor plates 7, and the bottom of the side steel beam 6 is welded to the corresponding group of anchor plates 7; the side surface of the side steel beam 6 close to the joint is vertically flush with the side surface of the corresponding side of the back wall 1 or the cross beam 2, and the top of the side steel beam 6 exceeds the top surface of the cross beam 2 and the top surface of the bridging slab 4; a clamping groove 11 is arranged on the side of the side steel beam 6 facing the joint; the elastic sealing strip 9 is arranged at the upper part of the joint, and both side edges of the elastic sealing strip 9 are respectively embedded in the clamping groove 11; a concrete layer 12 is poured at the first notch 3 and the second notch 5, and the top surface of the concrete layer 12 is flush with the top surface of the side steel beam 6, and the side surface of the concrete layer 12 is vertically flush with the side surface of the corresponding side of the back wall 1 or the cross beam 2.

[0022] In this embodiment, a corbel 13 is arranged on the side of the back wall 1 close to the bridging slab 4; the bridging slab 4 is lapped on the corbel 13, and a chamfer 14 is arranged along the transverse direction of the bridge at the outer side of the top of the corbel 13; a flexible cushion layer 15 is laid between the bridging slab 4 and the corbel 13.

[0023] In this embodiment, the anchor bars 8 are triangular, and the lower part of the anchor bars 8 is hoop-shaped outside the upper-layer steel bars of the steel bar framework 10. The upper ends of the anchor bars 8 are welded to the corresponding anchor plates 7. The anchor bars 8 and the anchor plates 7 are welded by double-sided welding, and the length of the weld is not less than 70 mm.

[0024] In this embodiment, the elastic sealing strip 9 is formed by splicing two arc-shaped strips 9.1. The longitudinal section of the arc-shaped strip 9.1 is arc-shaped, and a clamping edge 17 is arranged on the side of the arc-shaped strip 9.1 close to the clamping groove 11. The clamping edge 17 is embedded in the clamping groove 11.

[0025] In this embodiment, the side steel beam 6 includes a bottom plate 6.1 and a vertical plate 6.2. The bottom plate 6.1 is welded longitudinally and continuously on the top of a group of anchor plates 7. The vertical plate 6.2 is connected to the top of the bottom plate 6.1 and close to the joint side. A connecting strip 6.3 is arranged on the upper part of the vertical plate 6.2 and close to the joint side. The clamping groove 11 is arranged on the connecting strip 6.3.

[0026] In this embodiment, the height of the part where the steel bar framework 10 extends into the first notch 3 or the second notch 5 is not less than 250 mm. A steel bar mesh 18 is arranged on the upper part of the concrete layer 12 and close to the top surface.

[0027] In this embodiment, the anchor bars 8 are in the shape of a right triangle, and the right-angle side and the upper part of the hypotenuse of the anchor bars 8 are welded to the anchor plate 7.

[0028] In this embodiment, the steel bar framework 10 includes upper-layer steel bars 10.1, lower-layer steel bars 10.2, and stirrups 10.3. The upper-layer steel bars 10.1 are located in the concrete layer 12, and the lower-layer steel bars 10.2 are located in the back wall 1 or the cross beam 2. There is a group of stirrups 10.3, which are hoop-shaped at intervals along the transverse direction outside the upper-layer steel bars 10.1 and the lower-layer steel bars 10.2.

[0029] In this embodiment, the distance between the steel bar mesh 18 and the top surface of the concrete layer 12 is 30 cm.

[0030] In this embodiment, a flexible cushion layer 15 is padded between the bridging slab 4 and the corbel 13. The flexible cushion layer 15 is four layers of tar paper, and the thickness is 1 cm.

[0031] In this embodiment, a bridge deck pavement 19 is laid on the top of the cross beam 2, and the top surface of the bridge deck pavement 19 is flush with the top surface of the concrete layer 12. A deck pavement 16 is laid on the top of the cross beam 2, and the top surface of the deck pavement 16 is flush with the top surface of the concrete layer 12.

[0032] The above embodiments are not an exhaustive list of specific implementation manners, and there may be other embodiments. The purpose of the above embodiments is to illustrate the present utility model rather than limit the protection scope of the present utility model. All applications obtained by simple changes of the present utility model fall within the protection scope of the present utility model.

Claims

1. A telescopic joint structure between the back wall of a bridge approach slab and the beam slab, which is arranged at the joint between the back wall (1) and the cross beam (2); the top surface of the cross beam (2) exceeds the top surface of the back wall (1), and a first notch (3) is arranged along the transverse direction of the bridge in a full length at the top of one end of the cross beam (2) close to the back wall (1); a approach slab (4) is laid on the top of the back wall (1) on the side far from the cross beam (2), and there is a spacing between the end of the approach slab (4) and the corresponding side surface of the back wall (1), and the top of the approach slab (4) exceeds the top surface of the back wall (1); the part of the approach slab (4) exceeding the top surface of the back wall (1) and the top surface of the back wall (1) together form a second notch (5); it is characterized in that: It includes side steel girders (6), anchor plates (7), anchor bars (8) and elastic sealing strips (9); steel bar skeletons (10) are arranged at both the first notch (3) and the second notch (5); the steel bar skeletons (10) are arranged longitudinally along the transverse direction of the bridge, the lower parts of the steel bar skeletons (10) are buried in the cross beam (2) or the back wall (1), and the upper parts of the steel bar skeletons (10) are located in the first notch (3) or the second notch (5); a group of anchor plates (7) are arranged at intervals along the transverse direction of the bridge on each steel bar skeleton (10), and the anchor plates (7) are connected to the steel bar skeletons (10) through anchor bars (8); there are two side steel girders (6), which are respectively arranged transversely above two groups of anchor plates (7), and the bottom of the side steel girders (6) is welded to the corresponding group of anchor plates (7); the side surface of the side steel girder (6) close to the joint is vertically flush with the side surface of the corresponding side back wall (1) or cross beam (2), and the top of the side steel girder (6) exceeds the top surface of the cross beam (2) and the top surface of the approach slab (4); a clamping groove (11) is arranged on the side of the side steel girder (6) facing the joint; the elastic sealing strip (9) is arranged at the upper part of the joint, and the two side edges of the elastic sealing strip (9) are respectively embedded in the clamping groove (11); a concrete layer (12) is poured at the first notch (3) and the second notch (5), and the top surface of the concrete layer (12) is flush with the top surface of the side steel girder (6), and the side surface of the concrete layer (12) is vertically flush with the side surface of the corresponding side back wall (1) or cross beam (2).

2. The expansion joint structure between the back wall of the bridge approach slab and the beam slab according to claim 1, characterized in that: A corbel (13) is arranged on one side of the back wall (1) close to the approach slab (4); the approach slab (4) is lapped on the corbel (13), and a chamfer (14) is arranged longitudinally along the transverse direction on the outer side of the top of the corbel (13); a flexible cushion layer (15) is laid between the approach slab (4) and the corbel (13).

3. The expansion joint structure between the back wall of the bridge approach slab and the beam slab according to claim 1, characterized in that: The anchor bar (8) is triangular, the lower part of the anchor bar (8) is hoop-shaped outside the upper layer steel bars of the steel bar skeleton (10), and the upper end of the anchor bar (8) is welded to the corresponding anchor plate (7).

4. The expansion joint structure between the back wall of the bridge approach slab and the beam slab according to claim 1, characterized in that: The elastic sealing strip (9) is composed of two arc-shaped strips (9.1) spliced together, the longitudinal section of the arc-shaped strip (9.1) is arc-shaped, and a clamping edge (17) is arranged on one side of the arc-shaped strip (9.1) close to the clamping groove (11); the clamping edge (17) is embedded in the clamping groove (11).

5. The expansion joint structure between the back wall of the bridge approach slab and the beam slab according to claim 1, characterized in that: The side steel girder (6) includes a bottom plate (6.1) and a vertical plate (6.2); the bottom plate (6.1) is welded longitudinally along the transverse direction on the top of a group of anchor plates (7); the vertical plate (6.2) is connected to the top of the bottom plate (6.1) on the side close to the joint, and a connecting strip (6.3) is arranged on the upper part of the vertical plate (6.2) on the side close to the joint; the clamping groove (11) is arranged on the connecting strip (6.3).

6. The expansion joint structure between the back wall of the bridge approach slab and the beam slab according to claim 1, characterized in that: The height of the part of the steel bar skeleton (10) extending into the first notch (3) or the second notch (5) is not less than 250 mm; a steel bar mesh (18) is arranged at the upper part of the concrete layer (12) close to the top surface position.

Images