Maintenance and replacement method of bridge expansion device

Abstract

A maintenance and replacement method for a bridge expansion device comprises the following steps that S1, the expansion device in a maintenance area is dismantled; s2, an expansion joint groove area is dug, and a bracket and a water stop belt are dismantled; s3, an expansion joint groove area is trimmed and cleaned; s4, a lower connecting structure of the telescopic device is welded; s5, installing a water-tight belt; s6, a formwork is installed; s7, a concrete end formwork and an elastic sealing material end formwork are installed; s8, concrete and an elastic sealing material are poured; s9, mounting a telescopic device; s10, maintenance is carried out; s11, replacement preparation work of the telescopic devices in the adjacent to-be-maintained areas is carried out; s12, performing joint treatment on the maintenance transition area; and S13, the telescopic devices of the adjacent to-be-maintained areas are replaced. According to the maintenance and replacement method for the bridge expansion device, the replaced expansion device is of a full-water-sealing structure and can adapt to expansion deformation of a beam body, the water sealing performance is guaranteed, the mode of concentrated drainage of the expansion device is converted into the mode of bridge floor drainage, single-lane replacement can be achieved, and the problem of full-width road sealing caused by whole-lane replacement is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion joints in bridge engineering, and particularly to a method for repairing and replacing a bridge expansion device. Background Art

[0002] In order to meet the needs of the deformation of bridge girders, bridge expansion devices are generally installed between the two ends of a bridge, between the beam end and the abutment, or at the hinge position of the bridge. The expansion device can adapt to the temperature expansion and contraction deformation of the bridge, creep of concrete, and deformation caused by loads such as live loads on the bridge. At the same time, it can ensure the smooth passage of vehicles. The bridge expansion device directly bears the impact of wheel loads and is exposed to the natural environment for a long time. Therefore, the bridge expansion device is the most easily damaged structure in the bridge structure.

[0003] Currently, the common drainage method for comb-tooth type expansion devices is mainly to set a water stop structure at its lower part. Rainwater falls into the bottom water stop through the gaps between the comb teeth and then is discharged into the bridge drainage system through a water guide pipe. The above method of setting the water stop is mainly to directly bury the rubber water stop in the concrete structure during concrete pouring. Since the water stop is exposed to the air for a long time and is often subjected to the expansion and extrusion of the bridge, the rubber water stops of some bridge expansion devices will show natural aging, damage, etc., or silt will accumulate on the water stop, resulting in poor drainage, thus causing water leakage problems in the expansion device and affecting the driving safety of the lower road. Therefore, how to replace it with an expansion device with better water-tight performance and be able to construct under the traffic requirements of not closing traffic during the day and not interrupting traffic at night has become a new topic in the repair and replacement project of comb-tooth plate type expansion devices. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for repairing and replacing a bridge expansion device that can adapt to the expansion and contraction deformation of the beam body and has good water-tight performance in view of the above-mentioned current technical situation.

[0005] The technical solution adopted by the present invention to solve the above technical problem is as follows: A method for repairing and replacing a bridge expansion device, characterized by including the following steps:

[0006] S1. Demolish the cross-span plate and fixed plate of the expansion device within the maintenance area;

[0007] S2. Chisel the concrete within the expansion joint groove area, demolish the lower connection structure for supporting the cross-span plate and fixed plate, and demolish the water stop;

[0008] S3. Blow clean the damaged concrete and dust within the expansion joint groove area, check the size of the groove area, and repair the parts that do not meet the construction requirements;

[0009] S4. Weld the lower connection structure of the expansion device;

[0010] S5. Install on the water-tight belt;

[0011] S6. Install formworks on both sides of the installed water-tight belt, apply sealant at the gap between the formwork and the bottom of the groove area, and fixedly connect the formwork to the corresponding beam end;

[0012] S7. Install a concrete end formwork and an elastic sealant end formwork at the transverse end of the maintenance area;

[0013] S8. Horizontally arrange a pouring baffle at the beam end, pour concrete and elastic sealant, and the elastic water-tight material is arranged above the water-tight belt;

[0014] S9. Install an expansion device above the concrete and elastic sealant, and continue to pour concrete behind the joint plate and the fixed plate until it is flush with the road surface;

[0015] S10. Cure the concrete of the replaced expansion device, and after the curing is completed, continue to replace the expansion device in the adjacent maintenance area;

[0016] S11. Prepare for the replacement of the expansion device in the adjacent maintenance area to be repaired according to steps S1 to S4;

[0017] S12. Treat the joint of the maintenance transition area between the completed maintenance area and the adjacent maintenance area to be repaired;

[0018] S13. Replace the expansion device in the adjacent maintenance area to be repaired according to steps S5 to S10.

[0019] Preferably, in step S2, when removing the water-stop belt, cut the original water-stop belt according to the width of the excavation area. When removing the water-stop belt, remove the connecting angle steel of the water-stop belt together. In addition, ensure the flatness of the cutting surface during the cutting of the water-stop belt.

[0020] To facilitate the connection of the water-tight belt in the maintenance transition area, in step S5, the first end of the water-tight belt is flush with the bridge guardrail, and the second end extends into the maintenance transition area.

[0021] To ensure the sealing performance of the water-tight belt at the joint, the end of the water-tight belt located in the maintenance transition area is cut into a stepped shape.

[0022] To enable the elastic sealant to be connected in the maintenance transition area, further preferably, in step S7, the concrete end formwork is flush with the end of the maintenance area, and the elastic sealant end formwork is located in the maintenance transition area.

[0023] Further preferably, the elastic sealant end formwork is staggered from the stepped surface of the end of the water-tight belt.

[0024] In order to improve the bonding strength between the elastic sealing material and the adjacent maintenance area, the end face of the elastic sealing material in the maintenance transition area is roughened.

[0025] As a preferred solution, a filling material is provided between the elastic sealing material and the comb-shaped plate of the expansion device, and the filling material is processed into a stepped shape at the joint. The maintenance and replacement process of the expansion device in this preferred solution is similar to the above solution, and both the water-tight belt and the filling material are processed into a stepped shape at the joint.

[0026] As another preferred solution, the elastic sealing material includes an upper sealing material belt and a lower sealing material belt. The lower sealing material belt covers the water-tight belt, the filling material is filled between the upper sealing material belt and the lower sealing material belt, and the upper sealing material belt is arranged below the comb-shaped plate of the expansion device. The maintenance and replacement of the expansion device in this preferred solution is similar to the above solution, and in order to ensure the bonding strength and effect at the joint, both the water-tight belt and the filling material are processed into a stepped shape at the joint.

[0027] As another preferred solution, a support steel plate is installed at the bottom of the beam end of the expansion device, a filling material is provided above the support steel plate, and an elastic sealing material is provided above the filling material. The elastic sealing material is arranged below the comb-shaped plate of the expansion device. The maintenance and replacement of the expansion device in this preferred solution is similar to the above solution, and in order to ensure the bonding strength and effect at the joint, the filling material is processed into a stepped shape at the joint.

[0028] Compared with the prior art, the advantages of the present invention are as follows: The expansion device replaced by the maintenance and replacement method of the bridge expansion device adopts a fully water-tight structure, and the inside of the expansion device is filled with an elastic sealing material, which can not only adapt to the telescopic deformation of the beam body but also ensure the water-tight performance, solve the defect that the water stop belt of the conventional expansion device is prone to water leakage, and realize the conversion of the centralized drainage of the expansion device to the bridge deck drainage method. It can realize single-lane replacement, solve the problem of full-width road closure caused by whole-piece replacement. Moreover, the stepped adhesive method is adopted at the joint of the maintenance transition area, which can effectively ensure the bonding ability and sealing performance of the water-tight belt, elastic sealing material and filling material, and further improve the water-tight performance of the expansion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an existing bridge expansion device to be maintained and replaced;

[0030] Figure 2 It is a structural schematic diagram of the expansion device after excavation in the first embodiment of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the expansion device in the first embodiment of the present invention after placing the water-tight belt and bolt brackets;

[0032] Figure 4 Structural schematic diagram of the expansion device after installing the watertight belts on both sides of the template in the first embodiment of the present invention;

[0033] Figure 5 Structural schematic diagram of the expansion device after pouring concrete and elastic sealing material in the first embodiment of the present invention;

[0034] Figure 6 Structural schematic diagram of the expansion device after the installation of the comb teeth plate is completed in the first embodiment of the present invention;

[0035] Figure 7 Structural schematic diagram of the expansion device in the second embodiment of the present invention;

[0036] Figure 8 Structural schematic diagram of the expansion device in the third embodiment of the present invention;

[0037] Figure 9 Structural schematic diagram of the expansion device in the fourth embodiment of the present invention;

[0038] Figure 10 Schematic diagram of the maintenance transition area in the first embodiment of the present invention( Figure 15 Cross-sectional view taken along line A-A);

[0039] Figure 11 Schematic diagram of the connection of the maintenance transition area in the first embodiment of the present invention;

[0040] Figure 12 End face diagram of the watertight belt in the maintenance transition area in the first embodiment of the present invention;

[0041] Figure 13 Structural schematic diagram of the expansion device to be repaired and replaced in the first embodiment of the present invention;

[0042] Figure 14 Structural schematic diagram of the single-lane maintenance range of the expansion device in the first embodiment of the present invention;

[0043] Figure 15 Structural schematic diagram of the completion of the single-lane maintenance of the expansion device in the first embodiment of the present invention. Detailed implementation manners

[0044] The present invention will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0045] As Figure 1 shown, it is a conventional comb-type bridge expansion device. Its common drainage method is mainly to set a waterstop belt 4 under the expansion device 1. Rainwater falls into the bottom waterstop belt 4 through the comb teeth gaps and then is discharged into the bridge drainage system through a water guide pipe. The waterstop belt 4 is exposed to the air for a long time and is often subjected to the telescopic extrusion of the bridge, resulting in natural aging, damage and other conditions, thus causing the problem of water leakage of the expansion device.

[0046] The maintenance and replacement method of the bridge expansion device in this embodiment will Figure 1 replace the expansion device shown in Figure 6 with the expansion device shown in

[0047] As Figures 2 to 6 and Figures 10 to 15 shown, the direction indicated by arrow B is the driving direction. The maintenance and replacement method of this bridge expansion device includes the following steps:

[0048] S1. Demolish the joint crossing plate and fixing plate of the expansion device 1 in the maintenance area;

[0049] S2. Chisel the concrete 2 in the expansion joint groove area, demolish the lower connecting structure 3 for supporting the joint crossing plate and fixing plate, and demolish the water stop belt 4; the lower connecting structure 3 includes but is not limited to bolt brackets and brackets, etc., and the lower connecting structure 3 is installed on the embedded steel bars 100.

[0050] S3. Blow the damaged concrete 2 and dust in the expansion joint groove area, check the dimensions such as the length, width and depth of the groove area, and trim the parts that do not meet the requirements of the construction drawings;

[0051] S4. Weld the lower connecting structure 3 of the expansion device 1;

[0052] S5. Install the water-tight belt 5;

[0053] S6. Install formwork 6 on both sides of the installed water-tight belt 5, apply sealant at the gap between the formwork 6 and the bottom of the groove area to ensure the sealing of the concrete pouring area. The formwork 6 is fixedly connected to the corresponding beam end 10, and preferably fixed by lap welding; the formwork 6 is preferably made of steel plate.

[0054] S7. Install a concrete end formwork (not shown in the figure) and an elastic sealing material end formwork (not shown in the figure) at the transverse end of the maintenance area; the elastic sealing material end formwork is removed before the elastic sealing material 7 in the adjacent area to be maintained 102 is poured.

[0055] S8. Horizontally arrange a pouring baffle (not shown in the figure) at the beam end 10, pour the concrete 2 and the elastic sealing material 7, and the elastic water-tight material 7 is arranged above the water-tight belt 5; the pouring baffle needs to ensure sealing.

[0056] S9. Install the expansion device 1 above the concrete 2 and the elastic sealing material 7, and continue to pour the concrete 2 behind the joint crossing plate and the fixing plate until it is flush with the road surface;

[0057] S10. Cure the replaced expansion device concrete 2. After the curing is completed, continue to replace the expansion device 1 in the adjacent maintenance area. Taking the replacement of the expansion device in a single lane as an example, after the concrete strength reaches the requirement, the traffic of this lane can be opened, and the replacement of the expansion device in the next lane can be continued. Thus, the replacement of the expansion device in a single lane is completed.

[0058] S11. Prepare for the replacement of the expansion device 1 in the adjacent area to be maintained 102 according to steps S1 - S4.

[0059] S12. Treat the joint of the maintenance transition area 103 between the completed maintenance area 101 and the adjacent area to be maintained 102.

[0060] S13. Replace the expansion device 1 in the adjacent area to be maintained 102 according to steps S5 - S10.

[0061] Among them, in step S2, when removing the water stop 4, cut the original water stop 4 according to the width of the excavation area to ensure the flatness of the cutting surface, and remove the water stop connecting angle steel 41 together.

[0062] In step S5, the first end of the water - tight belt 5 is flush with the bridge guardrail 14, and the second end extends into the maintenance transition area 103, facilitating the connection of the water - tight belt 5 in the maintenance transition area. Apply sealant on the contact surface between the water - tight belt 5 and the beam end 10 to ensure the effective connection and sealing between the water - tight belt 5 and the beam end 10. In order to ensure the bonding area of the water - tight belt 5 at the joint and improve the sealing performance, the end of the water - tight belt located in the maintenance transition area 103 is cut into a stepped shape.

[0063] In step S7, the concrete end formwork is flush with the end of the maintenance area, and the elastic sealant end formwork is located in the maintenance transition area 103 and is staggered from the stepped surface of the end of the water - tight belt 5. In order to improve the bonding strength with the elastic sealant in the adjacent maintenance area and ensure the sealing performance at the joint, the end face of the elastic sealant 7 in the maintenance transition area 103 is roughened.

[0064] Embodiment Two:

[0065] As Figure 7 shown, there is a filling material 8 between the elastic sealant 7 and the comb - tooth plate of the expansion device 1 in this embodiment of the expansion device, and the filling material 8 is processed into a stepped shape at the joint. The maintenance and replacement method of this expansion device is similar to that of Embodiment One and will not be described in detail.

[0066] Embodiment Three:

[0067] As Figure 8As shown in the figure, the elastic sealing material 7 of this embodiment includes an upper sealing material strip 71 and a lower sealing material strip 72. The lower sealing material strip 72 covers the water-tight strip 5, and the filling material 8 is filled between the upper sealing material strip 71 and the lower sealing material strip 72. The upper sealing material strip 71 is arranged under the comb-shaped plate of the expansion device 1. In order to ensure the bonding strength and effect at the joint, both the water-tight strip 5 and the filling material 8 are processed into a stepped shape at the joint. The maintenance and replacement method of this expansion device is similar to that of the first embodiment and will not be described in detail here.

[0068] Embodiment 4:

[0069] As Figure 9 shown in the figure, a support steel plate 9 is installed at the bottom of the beam end 10 of the expansion device 1 of this embodiment. Above the support steel plate 9, there is a filling material 8, and above the filling material 8, there is an elastic sealing material 7. The elastic sealing material 7 is arranged under the comb-shaped plate of the expansion device 1. The maintenance and replacement method of this expansion device is similar to that of the first embodiment and will not be described in detail here.

[0070] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, various modifications or improvements can be made to the present invention. For example, during maintenance, the entire lane can be dug and repaired, or only a partial area within a single lane can be dug and repaired. These are all regarded as within the protection scope of the present invention.

Claims

1. A method for repairing and replacing a bridge expansion device, characterized in that The steps include: S1, dismantling the cross-seam plate and the fixing plate of the telescopic device (1) in the maintenance area; S2, chiseling away the concrete in the expansion joint groove area (2), removing the lower connection structure (3) used to support the span plate and the fixed plate, and removing the water stop (4); S3, blow away the damaged concrete (2) and dust in the expansion joint slot area, check the size of the slot area, and repair the parts that do not meet the construction requirements; S4, welding the lower connection structure (3) of the telescopic device (1); S5, installed on the watertight belt (5); S6. Install templates (6) on both sides of the installed watertight tape (5), apply sealant to the gap between the template (6) and the bottom of the groove area, and fix the template (6) to the corresponding beam end (10); S7. Install concrete end formwork and elastic sealing material end formwork at the lateral ends of the repair area; S8, a pouring baffle is arranged transversely at the beam end (10), concrete (2) and elastic sealing material (7) are poured, and the elastic water-tight material is arranged above the water-tight belt (5); S9, installing the telescopic device (1) above the concrete (2) and the elastic sealing material (7), and continuing to pour concrete (2) behind the span plate and the fixed plate until it is flush with the road surface; S10, curing the replaced telescopic device concrete (2), and after the curing is completed, continuing to replace the telescopic device (1) in the adjacent maintenance area; S11, performing preparation work for replacing the telescopic device (1) of the adjacent area to be repaired (102) according to steps S1 to S4; S12, the seam treatment of the maintenance transition area (103) between the maintenance area (101) and the adjacent area to be maintained (102) has been completed; S13. Replace the telescopic device (1) of the adjacent area to be repaired (102) according to steps S5 to S10.

2. The method for repairing and replacing a bridge expansion device according to claim 1, characterized in that: In step S2, when the water stop strip (4) is removed, the original water stop strip (4) is cut according to the width of the excavated area.

3. The method for repairing and replacing a bridge expansion device according to claim 2, characterized in that: In step S5, the first end of the watertight tape (5) is flush with the bridge guardrail, and the second end extends into the maintenance transition area (103).

4. The method for repairing and replacing a bridge expansion device according to claim 3 is characterized in that: The end of the watertight tape (5) located in the maintenance transition area (103) is cut into a step shape.

5. The method for repairing and replacing a bridge expansion device according to claim 4, characterized in that: In step S7, the concrete end formwork is flush with the end of the repair area, and the elastic sealing material end formwork is located in the repair transition area (103).

6. The method for repairing and replacing a bridge expansion device according to claim 5, characterized in that: The elastic sealing material end template is staggered with the step surface at the end of the watertight tape (5).

7. The method for repairing and replacing a bridge expansion device according to claim 4, characterized in that: The end surface of the elastic sealing material (7) in the maintenance transition area (103) is roughened.

8. The method for repairing and replacing a bridge expansion device according to any one of claims 1 to 7, characterized in that: A filling material (8) is provided between the elastic sealing material (7) and the comb plate of the telescopic device (1), and the filling material (8) is processed into a step shape at the joint.

9. The method for repairing and replacing a bridge expansion device according to any one of claims 1 to 7, characterized in that: The elastic sealing material (7) comprises an upper sealing material strip (71) and a lower sealing material strip (72), wherein the lower sealing material strip (72) covers the watertight strip (5), and the filling material (8) is filled between the upper sealing material strip (71) and the lower sealing material strip (72), and the upper sealing material strip (71) is arranged below the comb plate of the telescopic device (1).

10. The method for repairing and replacing a bridge expansion device according to claim 1, characterized in that: A supporting steel plate (9) is installed at the bottom of the beam end (10) of the telescopic device (1), a filling material (8) is provided above the supporting steel plate (9), an elastic sealing material (7) is provided above the filling material (8), and the elastic sealing material (7) is provided below the comb plate of the telescopic device (1).

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