Expansion joint structure suitable for small and medium-sized bridges and construction method

Abstract

The invention discloses an expansion joint structure suitable for small and medium-sized bridges and a construction method, and belongs to the technical field of bridge engineering.The expansion joint structure comprises a reserved groove formed in the edge of the top of a beam slab, and an anchoring assembly and subsequently poured concrete are arranged in the reserved groove; the tops of the anchoring assemblies on the two sides of the expansion joint are connected through an elastic telescopic assembly to plug the expansion joint, and the bottoms are connected through an elastic connecting assembly. The reserved groove is formed in the edge of the top of the beam plate, the anchoring assemblies can be installed in the reserved groove, the tops of the anchoring assemblies on the two sides of the expansion joint are connected through the elastic telescopic assembly to plug the expansion joint, and the bottoms of the anchoring assemblies are connected through the elastic connecting assembly. And finally, concrete is poured into the reserved groove till the concrete is flush with the pavement layer of the bridge. The problem of aging of the rubber elastic element of the bridge expansion joint can be solved, frequent replacement is not needed, the maintenance cost is reduced, the expansion joint cleaning frequency is reduced, maintenance manpower and material resources are saved, and the service life of the expansion joint structure is prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bridge engineering, and particularly relates to a structure of expansion joint suitable for small and medium-sized bridges and a construction method. BACKGROUND

[0002] With the rapid development of China's economy, the transportation and logistics industry is booming, and the pressure of road and bridge maintenance is also increasing day by day. According to the actual investigation on the spot, the bridge expansion joint, as one of the weak structures of the bridge, is extremely easy to be damaged under the action of driving load and environment, thereby causing water leakage or driving safety problems, and seriously affecting the service performance of the bridge structure. At the same time, daily maintenance and management work also needs to be done well. If the sundries such as silt and gravel in the expansion joint cannot be cleaned in time, the structure and normal function of the expansion joint will also be damaged, and the design requirements cannot be met. Among the diseases of the bridge expansion joint, the damage of the expansion joint structure caused by the aging of the rubber elastic element is one of the most common diseases. Rubber is very easy to be affected by light, heat, oxygen and other factors to cause aging phenomenon, so that the rubber elastic element needs to be replaced frequently, thereby affecting the service life of the expansion joint structure and increasing the maintenance cost.

[0003] Therefore, there is an urgent need for a structure of expansion joint suitable for small and medium-sized bridges and a construction method to solve the problems of aging of rubber elastic element and damage of expansion joint structure caused by garbage accumulation. SUMMARY

[0004] In order to solve the above problems, the present application provides a structure of expansion joint suitable for small and medium-sized bridges and a construction method.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: A structure of expansion joint suitable for small and medium-sized bridges, comprising a reserved groove and an anchoring assembly arranged at the top edge of the beam plate of the bridge, the reserved groove is arranged along the length direction of the expansion joint, the anchoring assembly is arranged in the reserved groove, and the reserved groove is further provided with concrete poured subsequently; the top parts of the anchoring assemblies on both sides of the expansion joint are connected through an elastic expansion assembly to seal the expansion joint, and the bottom parts of the anchoring assemblies are connected through an elastic connecting assembly.

[0006] Further, the anchoring assembly comprises a rectangular edge beam, an anchoring plate, an anchoring steel bar and a reserved steel bar, the reserved steel bar comprises a row of U-shaped bars arranged at intervals and longitudinal bars intersecting the U-shaped bars, both free ends of the U-shaped bars are inserted into the reserved holes of the reserved groove bottom beam plate, the longitudinal bars are arranged at intervals at the bending positions on both sides of the closed ends of the U-shaped bars; the anchoring steel bar is arranged in a row and corresponds to the top of the reserved steel bar; the side of the anchoring steel bar facing the expansion joint is connected with the anchoring plate, the rectangular edge beam is arranged on the top of the plurality of anchoring plates, and the outer side edges of the anchoring plate and the rectangular edge beam are flush with the edges of the expansion joint; the flanges of the elastic expansion assembly are fixedly connected with the top of the rectangular edge beam.

[0007] Further, the anchoring plate is arranged vertically, the anchoring plate is a right-angled trapezoidal steel plate, the side corner of the anchoring plate facing the expansion joint is fixedly connected with the bottom of the rectangular edge beam, the bottom of the inner side end of the anchoring plate is fixedly connected with the vertical part of the anchoring steel bar, the horizontal part of the anchoring steel bar is fixedly connected with the reserved steel bar, and the anchoring steel bar is arranged at intervals along the length direction of the expansion joint.

[0008] Further, the elastic expansion assembly comprises a U-shaped groove and an elastic structure in the groove, the flanges on both sides of the U-shaped groove are fixedly connected with the rectangular edge beam, and the groove of the U-shaped groove is arranged in the expansion joint; the elastic structure is filled in the groove of the U-shaped groove, and the top surface of the elastic structure is lower than the top surface of the rectangular edge beam.

[0009] Further, the width of the flange of the U-shaped groove is 30-50mm, the height of the U-shaped groove is 70-90mm, and the top surface of the elastic structure is 5mm lower than the top surface of the rectangular edge beam.

[0010] Further, the elastic structure adopts AB type two-component polysulfide sealant.

[0011] Further, the elastic connection assembly comprises two sets of fixing devices and a profiled steel plate, the profiled steel plate is arranged in the expansion joint and is fixedly connected with the fixing devices on both sides, the fixing device comprises a rectangular connecting steel plate and a row of gripping steel bars inserted into the concrete in the reserved groove, the gripping steel bars are arranged horizontally and one end of each gripping steel bar is fixedly connected with the middle part of the connecting steel plate, and the other end of each gripping steel bar is provided with an upward hook; the connecting steel plate is flush with the edges of the expansion joint.

[0012] Further, the thickness of the connecting steel plate is not less than 3mm, the profiled steel plate is arranged obliquely in the expansion joint, the profiled steel plate is a corrugated steel plate, and the folded edges at both ends of the corrugated steel plate are fixedly connected with the connecting steel plate by welding.

[0013] Further, the concrete adopts UHPC concrete, and the top surface of the concrete is flush with the top surface of the pavement layer of the bridge.

[0014] The application also provides a construction method suitable for the expansion joint structure of a small or medium-sized bridge, comprising the following steps. A reserved groove is processed in advance at the edge of the beam slab of the bridge; The fixing device of the prefabricated anchoring assembly and the elastic connecting assembly is installed in place in the reserved groove; The fixing device of the anchoring assembly and the elastic connecting assembly is installed in place in the reserved groove; The profiled steel plate of the elastic connecting assembly is welded and fixed with the fixing devices on both sides; The concrete is poured in the reserved groove, and the pouring height is leveled with the pavement layer of the bridge; After the strength of the concrete meets the requirements, the elastic expansion assembly is installed.

[0015] Compared with the prior art, the application has the following technical progress: The application processes a reserved groove at the top edge of the beam slab of the bridge, installs the anchoring assembly in the reserved groove, connects the top of the anchoring assemblies on both sides of the expansion joint through the elastic expansion assembly to realize the sealing of the expansion joint, connects the bottom of the anchoring assemblies through the elastic connecting assembly, and finally pours the concrete in the reserved groove to be flush with the pavement layer of the bridge. The application can solve the aging problem of the rubber elastic element of the bridge expansion joint, does not need to be replaced frequently, reduces the maintenance cost, reduces the cleaning frequency of the expansion joint, saves the maintenance manpower and material resources, and increases the service life of the expansion joint structure. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the application, and constitute a part of the specification, and are used to explain the application together with the embodiments of the application, and do not constitute a limitation to the application.

[0017] In the drawings: Figure 1 A structure schematic view suitable for the expansion joint structure of a small or medium-sized bridge is provided for the embodiments of the application; Figure 2 A structure schematic view of the U-shaped groove in the embodiments of the application; Figure 3 A structure schematic view of the anchoring steel bar in the embodiments of the application; Figure 4 A structure schematic view of the fixing device in the embodiments of the application; Figure 5 A structure schematic view of the profiled steel plate in the embodiments of the application; In the drawings: 00-Expansion joint; 1-Pavement layer; 2-Beam and slab; 3-Reserved groove; 4-Rectangular edge beam; 5-U-shaped groove; 501-Flange; 502-Groove; 6-Elastic structure; 7-Anchor plate; 8-Anchoring reinforcement; 801-Vertical part; 802-Horizontal part; 803-Bending part; 9-Reserved reinforcement; 901-U-shaped reinforcement; 902-Longitudinal reinforcement; 10-Fixing device; 1001-Holding reinforcement; 1002-Connecting steel plate; 11-Corrugated steel sheet; 1101-Folded edge; 1102-Wave steel sheet. Detailed Implementation

[0018] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0019] The expansion joint structure provided by this invention is particularly suitable for straight expansion joints in small and medium-sized bridges. It is convenient and quick to assemble and construct, and its application effect is good. However, the expansion joints of large bridges are mostly sawtooth-shaped, and this structure is not suitable for construction within sawtooth-shaped expansion joints, therefore it is not suitable for large bridges.

[0020] like Figure 1 As shown in the figure, an embodiment of the present invention provides a structure for expansion joints suitable for small and medium-sized bridges, including a reserved groove 3 and an anchoring assembly set at the top edge of the bridge beam 2. The reserved groove 3 is set along the length direction of the expansion joint 00, and the anchoring assembly is set in the reserved groove 3. The reserved groove 3 is also filled with concrete to be poured later. The tops of the anchoring assemblies on both sides of the expansion joint 00 are connected by elastic expansion assemblies to seal the expansion joint, and the bottoms of the anchoring assemblies are connected by elastic connecting assemblies. The anchoring assembly includes a rectangular side beam 4, an anchoring plate 7, anchoring bars 8, and reserved bars 9. The reserved bars 9 include a row of spaced U-shaped bars 901 and longitudinal bars 902 that cross them. The two free ends of the U-shaped bars 901 are inserted into the reserved holes of the bottom beam plate 2 of the reserved groove 3. The longitudinal bars 902 are spaced apart on the inner side of the bends on both sides of the closed ends of the U-shaped bars 901. The anchoring bars 8 are arranged in a row and are correspondingly arranged on the top of the reserved bars 9. The side of the anchoring bars 8 facing the expansion joint 00 is connected to the anchoring plate 7. The rectangular side beam 4 is arranged on the top of multiple anchoring plates 7. The outer edges of the anchoring plates 7 and the rectangular side beam 4 are flush with the edge of the expansion joint 00. The flange 501 of the elastic expansion assembly is fixedly connected to the top of the rectangular side beam 4.

[0021] In the specific implementation of the anchoring assembly, the rectangular side beam 4 is pre-welded with the anchoring plate 7 and the anchoring steel bar 8, and then the anchoring assembly is welded to the reserved steel bar 9 through the anchoring steel bar 8 as a whole. The anchoring assembly is symmetrically arranged on both sides of the expansion joint. Meanwhile, the rectangular side beam 4 is matched in size with the anchoring plate 7, and the length of the anchoring steel bar 8 is appropriate. The anchoring steel bar 8 is horizontally fixed on the top of the reserved steel bar 9, the vertical part 801 of the anchoring steel bar 8 is welded to the anchoring plate 7, and the horizontal part 802 of the anchoring steel bar 8 is welded to the longitudinal bar 902 of the reserved steel bar 9. The bending part 803 on the other side of the anchoring steel bar 8 is arranged opposite to the vertical part 801 and outside the anchoring plate 7. The bending part can increase the contact area with the concrete and also increase the gripping effect of the steel bar on the concrete. In addition, the anchoring steel bar 8 can also be welded in a vertical state. The longitudinal bar 902 can be arranged between the horizontal part 802 of the anchoring steel bar 8 and the horizontal section of the U-shaped bar 901. The end of the bending part 803 of the anchoring steel bar 8 can extend to the outside of the anchoring plate 7 or be welded to the anchoring plate 7.

[0022] In the specific embodiment of the present application, as shown in Figure 1 、 5 , the anchoring plate 7 is arranged vertically, the anchoring plate 7 is a right-angled trapezoidal steel plate, one side corner of the anchoring plate 7 facing the expansion joint 00 is fixedly connected with the bottom of the rectangular side beam 4, the inside end of the bottom of the anchoring plate 7 is fixedly connected with the vertical part 801 of the anchoring steel bar 8, the horizontal part 802 of the anchoring steel bar 8 is fixedly connected with the reserved steel bar 9, and the anchoring steel bar 8 is a plurality of steel bars and is arranged at intervals along the length direction of the expansion joint 00. The anchoring plate 7 and the anchoring steel bar 9 are a plurality of groups and are uniformly arranged below the rectangular side beam 4.

[0023] In the specific embodiment of the present application, as shown in Figure 1 、 2 , the elastic expansion assembly includes the U-shaped groove 5 and the elastic structure 6 in the groove 502 of the U-shaped groove 5. The two side flanges 501 of the U-shaped groove 5 are fixedly connected with the rectangular side beam 4, and the groove 502 of the U-shaped groove 5 is arranged in the expansion joint 00. The elastic structure 6 is filled in the groove 502 of the U-shaped groove 5, and the top surface of the elastic structure 6 is lower than the top surface of the rectangular side beam 4. In order to increase the structural stability and adapt to the bridge with large traffic volume, the full welding process is adopted to weld the flange 501 above the rectangular side beam 4, and the width of the flange 501 is recommended to be 30-50 mm. The groove 502 is located in the expansion joint, and in order to ensure the expansion and deformation of the U-shaped groove 5, the height of the U-shaped groove is recommended to be 70-90 mm. Meanwhile, the top surface of the elastic structure 6 is 5 mm lower than the top surface of the rectangular side beam 4.

[0024] In the specific construction, the elastic structure 6 adopts AB type two-component polysulfide sealant, wherein the ratio of A:B is 10:1. The AB type two-component polysulfide sealant has the advantages of good integrity, good durability, large elasticity and good combination with the U-shaped groove 5, is filled in the U-shaped groove 5 and can adapt to the change of the expansion joint. Through actual effect detection, the two-component pouring glue has good elasticity, excellent durability and can be well combined with the rectangular boundary beam, has good structural performance and is filled in the U-shaped groove 5 as a filling material medium to form the elastic structure.

[0025] In the specific embodiment of the present application, as shown in Figure 1 、 3 , 4, the elastic connecting assembly comprises two sets of fixing devices 10 and a profiled steel plate 11, the profiled steel plate 11 is arranged in the expansion joint 00 and is fixedly connected with the fixing devices 10 on both sides, the fixing device 10 comprises a rectangular connecting steel plate 1002 and a row of gripping steel bars 1001 inserted into the concrete in the reserved groove 3, the gripping steel bars 1001 are horizontally arranged and one end thereof is fixedly connected with the middle part of the connecting steel plate 1002 vertically, and the other end of the gripping steel bar 1001 is provided with an upward hook; the connecting steel plate 1002 is flush with the edge of the expansion joint 00. Among them, the fixing device 10 is a set of devices, which is uniformly arranged along the length direction of the expansion joint, and the number thereof is set according to the size of the bridge width, but should not be less than 2 gripping steel bars 1001 and a connecting steel plate 1002 with appropriate length and width, one end of the gripping steel bar 1001 is firmly welded with the connecting steel plate 1002, the other end is upwardly bent, and the bent end is inserted into the reserved groove 3. The thickness of the connecting steel plate 1002 should not be less than 3 mm, and the length and width thereof are set according to the actual size of the bridge, but should not be too small.

[0026] In the specific manufacturing, the profiled steel plate 11 is arranged in the expansion joint 00, the profiled steel plate 11 is a corrugated steel plate 1102, and the corrugated steel plate 1102 is provided with upward bent edges 1101 at both ends and is welded and fixed with the connecting steel plate 1002. Among them, the profiled steel plate 11 can be installed in the way of high front and low back or low front and high back to ensure that the profiled steel plate has a certain inclination angle before and after and ensure that the accumulated water can flow out smoothly.

[0027] In the specific construction, the concrete adopts UHPC concrete, and the top surface of the concrete is flush with the top surface of the pavement layer 1 of the bridge. The UHPC concrete (ultra-high ductility concrete) has the characteristics of excellent combination with the asphalt pavement, good fast hardening and high strength, and through field test, the filling effect of the UHPC concrete is the best.

[0028] The present application also provides a construction method suitable for the expansion joint structure of the small and medium-sized bridge, which comprises the following steps: The reserved groove is processed in advance on the top edge of the beam slab 2 of the bridge; The fixing device of the prefabricated anchoring assembly and the elastic connecting assembly; The one end of the gripping steel bar 1001 of the fixing device is firmly welded with the connecting steel plate 1001, and the other end is disposed with a hook, and the gripping steel bar is inserted into the reserved groove 3.

[0029] Then, the profiled steel plate 11 is connected with the connecting steel plate 1001: the two end bending parts 1101 of the profiled steel plate 11 are welded with the connecting steel plates 1002 on both sides of the expansion joint 00 respectively, and when the connection is made, the front high and rear low or the front low and rear high mode can be adopted, so that the profiled steel plate 1102 has a certain inclination angle front and rear.

[0030] The rectangular boundary beam 4 is welded with the anchoring plate 7 and the anchoring steel bar 8, and after the welding is completed, the anchoring steel bar 8 is welded and fixed with the top end of the reserved steel bar 9.

[0031] Then, the UHPC concrete is poured into the reserved groove 3, and the pouring height is flat with the paving layer.

[0032] After the concrete in the reserved groove 3 meets the requirements, the U-shaped groove 5 is installed: the bottom of the U-shaped groove 5 is placed in the expansion joint 00, and the flange 501 is welded with the rectangular boundary beam 4; finally, the two-component pouring glue is filled in the groove 502 to form the elastic structure 6, and the filling height is lower than the top end of the rectangular boundary beam 4 by 5 mm.

[0033] As described above, the U-shaped groove is adopted to replace the traditional water stop structure, the elastic performance is excellent, the normal expansion deformation of the bridge can be met, the durability is good, the aging and long-term replacement problem of the rubber structure is avoided; at the same time, the structure is convenient for later maintenance and replacement, only the U-shaped groove needs to be replaced, the transition zone concrete does not need to be damaged, and the maintenance cost is greatly reduced. The two-component pouring glue has good elasticity, excellent durability and good combination with the rectangular boundary beam, and has good structure performance, as a filling material filled in the U-shaped groove, under the premise of meeting the normal structure and the expansion function, the manpower, material resources and financial resources can be greatly saved. The front and rear inclined wave-shaped profiled steel plates are arranged at the bottom of the reserved groove, which can adapt to the deformation caused by the vertical bridge, form a barrier, avoid the damage of the evaporation of water under the bridge to the U-shaped groove, increase the applicability of the structure, especially for the application of the river-crossing bridge, and the front and rear inclination of the wave-shaped steel plate can effectively guide and discharge the water flow, prevent the erosion of water to the beam plate.

[0034] At present, the scheme has been put into implementation, and the application effect is good. The aging problem of the bridge expansion joint rubber elastic element is solved by adopting the application, the replacement is not necessary, the maintenance cost is reduced; the expansion joint is shielded by the U-shaped groove, the cleaning frequency of the expansion joint is reduced, the maintenance manpower and material resources are saved, and the service life of the expansion joint structure is also prolonged.

[0035] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A structure for expansion joints suitable for small and medium-sized bridges, characterized in that: It includes a reserved groove and an anchoring component set at the top edge of the bridge beam. The reserved groove is set along the length of the expansion joint, and the anchoring component is set in the reserved groove. The reserved groove is also filled with concrete to be poured later. The tops of the anchoring components on both sides of the expansion joint are connected by elastic expansion components to seal the expansion joint, and the bottoms of the anchoring components are connected by elastic connecting components.

2. The expansion joint structure for small and medium-sized bridges according to claim 1, characterized in that: The anchoring assembly includes a rectangular side beam, an anchoring plate, anchoring bars, and reserved bars. The reserved bars include a row of spaced U-shaped bars and longitudinal bars that cross them. The two free ends of the U-shaped bars are inserted into reserved holes in the bottom beam of the reserved groove. The longitudinal bars are spaced at the bends on both sides of the closed ends of the U-shaped bars. The anchoring bars are in a row and are correspondingly placed on top of the reserved bars. The side of the anchoring bars facing the expansion joint is connected to the anchoring plate. The rectangular side beam is placed on top of multiple anchoring plates. The outer edges of the anchoring plates and the rectangular side beam are flush with the edges of the expansion joint. The flange of the elastic expansion assembly is fixedly connected to the top of the rectangular side beam.

3. A structure for expansion joints suitable for small and medium-sized bridges according to claim 2, characterized in that: The anchor plate is arranged vertically and is a right-angled trapezoidal steel plate. One corner of the anchor plate facing the expansion joint is fixed to the bottom of the rectangular side beam. The bottom of one inner end of the anchor plate is fixed to the vertical part of the anchoring steel bar. The horizontal part of the anchoring steel bar is fixed to the reserved steel bar. There are several anchoring steel bars, which are arranged at intervals along the length of the expansion joint.

4. A structure for expansion joints suitable for small and medium-sized bridges according to claim 2, characterized in that: The elastic expansion joint includes a U-shaped groove and an elastic structure within the groove. The two flanges of the U-shaped groove are fixedly connected to a rectangular side beam, and the groove of the U-shaped groove is located within the expansion joint. The elastic structure fills the groove of the U-shaped groove, and the top surface of the elastic structure is lower than the top surface of the rectangular side beam.

5. A structure for expansion joints suitable for small and medium-sized bridges according to claim 4, characterized in that: The flange width of the U-shaped groove is 30-50mm, and the height of the U-shaped groove is 70-90mm; the top surface of the elastic structure is 5mm lower than the top surface of the rectangular side beam.

6. A structure for expansion joints suitable for small and medium-sized bridges according to claim 5, characterized in that: The elastic structure uses an AB-type two-component polysulfide seal.

7. A structure for expansion joints suitable for small and medium-sized bridges according to claim 4, characterized in that: The elastic connection assembly includes two sets of fixing devices and profiled steel sheets. The profiled steel sheets are installed inside the expansion joint and are fixed to the fixing devices on both sides. The fixing devices include rectangular connecting steel plates and a row of reinforcing bars inserted into the pre-reserved groove and wrapped with concrete. The reinforcing bars are arranged horizontally and one end is vertically fixed to the middle of the connecting steel plate. The other end of the reinforcing bars is provided with an upward hook. The connecting steel plates are flush with the edge of the expansion joint.

8. A structure for expansion joints suitable for small and medium-sized bridges according to claim 7, characterized in that: The thickness of the connecting steel plate is not less than 3mm; the profiled steel plate is arranged obliquely in the expansion joint, the profiled steel plate is a corrugated steel plate, and the two ends of the corrugated steel plate are welded and fixed to the connecting steel plate.

9. A structure for expansion joints suitable for small and medium-sized bridges according to claim 2, characterized in that: The concrete used is UHPC concrete, and the top surface of the concrete is flush with the top surface of the bridge pavement layer.

10. A construction method suitable for expansion joint structures in small and medium-sized bridges, characterized in that, The construction steps for expansion joint structures applicable to small and medium-sized bridges as described in claim 7 are as follows: Pre-cut grooves are made on the edges of the bridge beams; Fixing devices for prefabricated anchoring components and flexible connection components; Install the fixing devices for the anchoring components and flexible connection components into the reserved slots; The profiled steel sheet of the elastic connection component is welded and fixed to the fixing devices on both sides; Concrete is poured into the reserved groove, with the pouring height level with the bridge's pavement layer; After the concrete reaches the required strength, install the elastic expansion joint.

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