Anti-sedimentation device for road and bridge construction and construction method thereof

Abstract

The invention relates to the field of sedimentation prevention of road and bridge construction, and discloses a sedimentation prevention device for road and bridge construction and a construction method thereof.The sedimentation prevention device for road and bridge construction comprises a bridge abutment body, a roadbed structure, a piston pipeline, a pressure barrel body, an oil tank, a jacking structure, a piston structure, a butt strap body, a transition cavity, a reset spring and a mud box; the piston pipeline is vertically arranged in the mounting groove, the bottom of the piston pipeline penetrates through the bottom of the pressure barrel body, the piston structure is slidably arranged in the piston pipeline, the pressure barrel body communicates with an oil tank through a high-pressure oil pipe, the butt strap body is prefabricated through concrete and arranged above the jacking structure, and a transition cavity is formed between the butt strap body and the jacking structure. A plurality of sets of reset springs are evenly arranged in the transition cavity, and a slurry box is arranged on the right side of the roadbed structure arranged on one side of the bridge abutment body and communicates with the transition cavity. According to the invention, settlement can be made up, extra monitoring and later regular detection are not needed, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the field of anti-settlement technology in road and bridge construction, for example to an anti-settlement device for road and bridge construction and its construction method. Background Technology

[0002] In the construction of bridge structures in municipal engineering projects, reinforced concrete approach slabs are installed in the road-bridge transition section to mitigate the problem of bridge approach slab settlement. The construction quality of the approach slabs has become a key factor affecting bridge approach slab settlement. Currently, the measures to ensure the construction quality of approach slabs in road-bridge transition sections in China are to fill the space under the approach slab with cement grout or cement mortar to provide support. The main standards and specifications followed are the "Code for Construction and Acceptance of Urban Bridge Engineering" CJJ2-2008 and the "Code for Acceptance of Construction Quality of Concrete Structures" GB50204-2015.

[0003] The following technical challenges are commonly encountered in the construction of bridge approach slabs for existing road-bridge transition sections: First, insufficient compaction of the backfill soil or ineffective drainage causes the bottom of the approach slab to become void, resulting in significant bumps when vehicles pass over it; second, voids cause the approach slab to be suspended and subjected to stress exceeding its bending capacity, leading to lateral fractures and creating height differences between the approach slab and the abutment / roadbed, resulting in misalignment; third, the voided area expands under repeated vehicle traffic, and the approach slab collapses locally after losing support, allowing water to seep into the base layer and soften the materials; fourth, the impact vibrations from vehicle bounces are transmitted to expansion joints, supports, and piers, accelerating damage to bridge ancillary facilities; fifth, replacing broken approach slabs requires demolition and reconstruction, leading to a surge in social costs due to traffic closures, with subsequent maintenance costs reaching 3-5 times the initial construction cost, and repeated repairs having limited effectiveness. Summary of the Invention

[0004] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0005] This disclosure provides an anti-settlement device and its construction method for road and bridge construction, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A settlement prevention device for road and bridge construction, characterized in that it includes a bridge abutment, a roadbed structure, a piston pipeline, a pressure tank, an oil tank, a jacking structure, a piston structure, an approach plate, a transition cavity, a return spring, and a mud tank. The abutment is the connection structure between the bridge and the roadbed structure. It provides a fixed support end point for the approach slab and bears the load transmitted by the approach slab. An installation groove is excavated in the roadbed structure behind the abutment. The piston pipeline is vertically installed in the installation groove. The bottom of the piston pipeline extends through the bottom center of the pressure tank. The piston structure is slidably installed in the piston pipeline. The vertical movement of the piston structure can ensure that the piston moves smoothly downward after being subjected to force, and transmits the pressure of the roadbed filler to the hydraulic system. The pressure tank is connected to an oil tank via a high-pressure oil pipe. The oil tank is connected to a jacking mechanism via a high-pressure oil pipe, receiving the hydraulic oil squeezed by the pressure tank and delivering it to the jacking mechanism to drive the jack rod to extend. The approach slab is made of precast concrete and is set above the jacking structure. A transition cavity is provided between the approach slab and the jacking structure. Multiple sets of return springs are evenly arranged inside the transition cavity. The elastic force is used to assist the approach slab in returning to its original position, thereby enhancing the anti-settlement effect and improving the road surface smoothness. A slurry tank is installed on the right side of the roadbed structure located on one side of the bridge abutment. The slurry tank is connected to the transition cavity. When the settlement is severe, grout is injected into the transition cavity through a pump to fill the depression and prevent water from seeping into the base layer. This method is suitable for repairing large settlement.

[0007] 2. The anti-settlement device and its construction method for road and bridge construction according to claim 1, characterized in that the two ends of the return spring are welded and fixed to the lower surface of the jacking plate and the top side of the jacking structure, respectively.

[0008] 3. The anti-settlement device and its construction method for road and bridge construction according to claim 1, characterized in that the jacking structure is a lifting cylinder, and the piston structure is in contact with the roadbed filler inside the pressure tank and connected to a piston rod.

[0009] 4. The anti-settlement device and its construction method for road and bridge construction according to claim 1, characterized in that a conveying pump is installed on the mud tank, and the output end of the conveying pump is connected to the transition cavity through a pipe with a solenoid valve.

[0010] 5. A construction method for an anti-settlement device used in road and bridge construction, characterized by comprising the following steps: Step A: Construction preparation, clearing loose soil and debris from the surface of the roadbed structure behind the bridge abutment, using a total station for positioning and layout, and excavating the installation trench according to the design dimensions; Step B: Install the pressure tank assembly. Hoist the pressure tank body into the bottom of the installation slot and seal the piston pipeline to the bottom of the pressure tank body. Fill the pressure tank body with graded crushed stone filler in layers. Apply lubricating oil to the piston structure and slowly insert the piston pipeline. Step C: Install the hydraulic system. Fix the oil tank to the left side of the pressure tank body using a steel bracket. Connect the oil outlet of the pressure tank body to the oil tank using a high-pressure oil pipe. Also connect the oil tank to the jacking structure using a high-pressure oil pipe. Use a compression fitting for the oil pipe joints. Step D: Install the platform body and transition cavity, and fix the transition cavity to the top of the jacking structure with high-strength bolts; install the return springs in the transition cavity in a staggered pattern, use a truck crane to lift the platform body, and adjust the levelness with wedge steel plates after it is in place; Step E: Install the mud system. Set up a mud tank on the right side of the roadbed structure. Install a delivery pump on the mud tank and connect it to the transition cavity using a plastic composite pipe. The solenoid valve on the plastic composite pipe is a solenoid directional valve and is linked to a pressure sensor set up in a suitable location. Step F: Commissioning and acceptance. The initial elevation of the slab is monitored using a total station. Settlement is simulated by sandbag loading to test the response time and support force of the jacking structure. The mud system undergoes three start-stop cycle tests.

[0011] The present disclosure provides an anti-settlement device and its construction method for road and bridge construction, which can achieve the following technical effects: 1): This invention utilizes the natural settlement of the bridge approach slab to compact and deform the roadbed filler in the pressure tank, increasing its density and generating increased gravity. This causes the piston to move downward, squeezing the hydraulic oil in the oil tank and moving it towards the lifting cylinder, which in turn moves the lifting rod. This automatically provides upward support to the approach slab, effectively compensating for settlement. No additional monitoring or periodic inspections are required, reducing maintenance costs. 2): The reset spring installed in the transition cavity of the present invention can use its elastic force to make the ramp plate reset, further enhancing the anti-settlement effect and improving the road surface smoothness; 3): The mud tank in this invention is connected to the transition cavity. When the settlement is severe, mud can be poured into the transition cavity by a pump to fill the sunken road surface and ensure the quality of the road surface. It is suitable for different degrees of settlement. 4): This device integrates bridge approach slab construction and maintenance, has a stable and durable structure, good support performance, reduces the impact on the external environment, and is easy to promote and apply.

[0012] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0013] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are considered to be similar elements. The drawings do not constitute a limitation on scale. Other drawings can be obtained by those skilled in the art based on these drawings.

[0014] Figure 1 This is a schematic diagram of an anti-settlement device for road and bridge construction according to the present invention.

[0015] Figure label: 1-Bridge abutment body, 2-Subgrade structure, 3-Piston pipeline, 4-Pressure tank body, 5-Oil tank, 6-Pushing structure, 7-Piston structure, 8-Approach plate body, 9-Transition cavity, 10-Reset spring, 11-Mud tank. Detailed Implementation

[0016] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0017] Example 1: An anti-settlement device for road and bridge construction, comprising a bridge abutment (1), a roadbed structure (2), a piston pipeline (3), a pressure tank (4), an oil tank (5), a jacking structure (6), a piston structure (7), a slab body (8), a transition cavity (9), a return spring (10), and a mud tank (11).

[0018] The abutment (1) is the connection structure between the bridge and the roadbed, and can provide a support end point for the approach slab (8). An installation groove is excavated in the roadbed structure (2) behind the abutment (1), and the piston pipe (3) is vertically installed in the installation groove. The piston pipe (3) can be made of seamless steel pipe, and its bottom extends through the bottom center of the pressure tank body (4). The pressure tank body (4) is filled with graded crushed stone (particle size 5-20mm) as roadbed filler. The piston structure (7) is made of chrome-plated piston and is slidably installed in the piston pipe (3). The piston structure (7) is in contact with the roadbed filler in the pressure tank body (4) and is connected to a piston rod, which guides the piston structure (7) to move vertically, ensuring that the piston moves smoothly downward after being stressed, and transmitting the pressure of the roadbed filler.

[0019] The pressure barrel body (4) is essentially a pressure sensing chamber for roadbed filler. It is connected to an oil tank (5) via a high-pressure oil pipe. The oil tank (5) is connected to the jacking structure (6) via a high-pressure oil pipe. When the slab body (8) settles, the filler is squeezed and deformed, increasing its density and pushing the piston structure (7) downward. This will then transmit the oil pressure to the oil tank (5). The oil tank (5) is a hydraulic medium transfer station that receives the hydraulic oil squeezed by the pressure barrel body (4). Thus, the jacking structure (6) is lifted by the oil tank (5).

[0020] The jacking slab (8) is precast concrete and installed above the jacking structure (6). In actual operation, multiple jacking structures (6) can be installed in parallel to uniformly release the jacking pressure on the jacking slab (8) and stably compensate for the settlement. A transition cavity (9) is provided between the jacking slab (8) and the jacking structure (6). The transition cavity (9) is a sealed cavity, and multiple sets of return springs (10) are evenly arranged inside. The two ends of the return springs (10) are welded and fixed to the lower surface of the jacking slab (8) and the top side of the jacking structure (6), respectively. The rigid contact between the transition cavity (9) buffer plate body (8) and the jacking structure (6) avoids stress concentration. As the installation carrier of the reset spring (10) and the slurry filling space, it can realize the dual functions of elastic reset and grouting repair. The vehicle load borne by the plate body (8) is connected to the transition cavity (9) and simultaneously supported by the jacking structure (6) and the reset spring (10). The elastic force is used to assist the plate body (8) in reset, enhance the anti-settlement effect, improve the road surface smoothness, and form a rigid and flexible support system with the jacking structure (6).

[0021] A mud tank (11) is set on the right side of the roadbed structure (2) located on one side of the bridge abutment (1). The mud tank (11) contains cement slurry with a suitable water-cement ratio. A stirring device can be added to the mud tank (11) to prevent the cement slurry from settling. An ISG50-160 conveying pump is installed on the mud tank (11). The output end of the conveying pump is connected to the transition chamber (9) through a pipe with a solenoid valve. When the settlement of the slab body (8) exceeds the threshold height, the piston structure (7) moves downward under the pressure of the filling, and the hydraulic oil pushes the lifting cylinder to extend. The stroke is linearly corresponding to the settlement. If the settlement continues to increase, the solenoid valve will be automatically opened, and the conveying pump on the mud tank (11) will start filling to the preset pressure and then stop. During the settlement and filling recovery process, the reset spring will always provide buffer force to ensure the stability of the settlement or recovery process.

[0022] The piston structure (7) and the pressure tank body (4) are used to perform hydraulic automatic compensation in the first step to prevent the settlement of the approach slab (8). During the settlement process, the reset spring (10) itself will provide an upward repulsive force to the approach slab (8). Finally, the conveying pump on the mud tank (11) is activated to perform active grouting. The problem of the settlement of the approach slab in the road and bridge transition section is solved automatically through the cooperation of three sets of mechanisms. No additional testing is required, which reduces maintenance costs.

[0023] A construction method for an anti-settlement device used in road and bridge construction. Step 1: Construction preparation, clean the loose soil and debris on the surface of the roadbed structure (2) behind the bridge abutment (1), use a total station to position and lay out, excavate the installation trench according to the design dimensions, support the trench wall with steel sheet piles, and lay a crushed stone cushion layer on the base and compact it.

[0024] Step 2: Install the pressure tank assembly. Hoist the pressure tank body (4) into the bottom of the installation groove and fix it to the concrete foundation with expansion bolts. The piston pipeline (3) is sealed to the bottom of the pressure tank body (4) through a flange. Fill the pressure tank body (4) with graded crushed stone filler in layers and compact it with a small vibratory roller. After applying lubricating oil to the piston structure (7), slowly put it into the piston pipeline (3) to ensure that the gap between the piston and the pipeline is uniform.

[0025] Step 3: Install the hydraulic system. Fix the oil tank (5) to the left side of the pressure tank body (4) with a steel bracket. Install an air filter (model QUQ2-25) at the vent hole on the top of the oil tank. Connect the oil outlet of the pressure tank body (4) to the oil tank (5) with a high-pressure oil pipe. Connect the oil tank (5) to the jacking structure (6) with a high-pressure oil pipe. Use a compression fitting for the oil pipe joint. Check the system's sealing performance through a hydraulic oil circulation test to ensure there is no leakage.

[0026] Step 4: Install the jacking plate (8) and the transition cavity (9). Fix the transition cavity (9) to the top of the jacking structure (6) with high-strength bolts. Install the reset springs (10) in the transition cavity (9) in a staggered pattern. Weld the two ends of the springs. Use a truck crane to lift the jacking plate (8). After it is in place, adjust the level with wedge steel plates. Leave a 20mm expansion joint between the jacking plate (8) and the bridge abutment (1) and fill it with foam board.

[0027] Step 5: Install the mud system. Set up a mud tank (11) on the right side of the roadbed structure (2). Install Y-type filters on the inlet and outlet of the mud tank (11) and connect it to the transition chamber (9) with a plastic composite pipe. The solenoid valve on the plastic composite pipe is a solenoid directional valve and is linked with the pressure sensor set in a suitable position.

[0028] Step 6: Debugging and acceptance. Use a total station to monitor the initial elevation of the slab (8); simulate settlement by stacking sandbags and test the response time and support force of the jacking structure (6); conduct three start-stop cycle tests on the mud system to ensure stable grouting pressure and flow.

[0029] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Some parts and features of some embodiments may be included or replaced by parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A settlement prevention device for road and bridge construction, characterized in that, It includes the bridge abutment (1), roadbed structure (2), piston pipeline (3), pressure tank (4), oil tank (5), jacking structure (6), piston structure (7), slab body (8), transition cavity (9), return spring (10) and mud box (11). An installation groove is excavated in the roadbed structure (2) on the rear side of the bridge abutment. The piston pipe (3) is vertically installed in the installation groove. The bottom of the piston pipe (3) extends through the bottom center of the pressure tank body (4). The piston structure (7) is slidably installed in the piston pipe (3). The pressure tank body (4) is connected to an oil tank (5) via a high-pressure oil pipe, and the oil tank (5) is connected to the jacking structure (6) via a high-pressure oil pipe. The slab body (8) is precast concrete and set above the jacking structure (6). A transition cavity (9) is provided between the slab body (8) and the jacking structure (6). Multiple sets of reset springs (10) are evenly arranged inside the transition cavity (9). A mud box (11) is provided on the right side of the roadbed structure (2) located on one side of the bridge abutment (1), and the mud box (11) is connected to the transition cavity (9).

2. The anti-settlement device and its construction method for road and bridge construction according to claim 1, characterized in that, The two ends of the reset spring (10) are welded and fixed to the lower surface of the mounting plate (8) and the top side of the jacking structure (6), respectively.

3. The anti-settlement device and its construction method for road and bridge construction according to claim 1, characterized in that, The jacking structure (6) is a jacking cylinder, and the piston structure (7) is in contact with the roadbed filler inside the pressure tank body (4) and is connected to a piston rod.

4. The anti-settlement device and its construction method for road and bridge construction according to claim 1, characterized in that, A delivery pump is installed on the mud tank (11), and the output end of the delivery pump is connected to the transition chamber (9) through a pipe with a solenoid valve.

5. A construction method for an anti-settlement device used in road and bridge construction, characterized in that, Includes the following steps: Step A: Construction preparation, clean the loose soil and debris on the surface of the roadbed structure (2) behind the bridge abutment (1), use a total station for positioning and layout, and excavate the installation trench according to the design dimensions; Step B: Install the pressure tank assembly, hoist the pressure tank body (4) into the bottom of the installation groove, and seal the piston pipeline (3) to the bottom of the pressure tank body (4); fill the pressure tank body (4) with graded crushed stone filler in layers; apply lubricating oil to the piston structure (7) and slowly insert it into the piston pipeline (3). Step C: Install the hydraulic system. Fix the oil tank (5) to the left side of the pressure tank body (4) with a steel bracket. Connect the oil outlet of the pressure tank body (4) to the oil tank (5) with a high-pressure oil pipe. Connect the oil tank (5) to the jacking structure (6) with a high-pressure oil pipe. Use a compression fitting for the oil pipe joint. Step D: Install the platform body (8) and transition cavity (9), fix the transition cavity (9) to the top of the jacking structure (6) with high-strength bolts; install the reset springs (10) in the transition cavity (9) in a staggered pattern, use a truck crane to lift the platform body (8), and adjust the levelness by using wedge steel plates after it is in place; Step E: Install the mud system. Set up a mud tank (11) on the right side of the roadbed structure (2). Set up a delivery pump on the mud tank (11) and connect it to the transition cavity (9) with a plastic composite pipe. The solenoid valve on the plastic composite pipe is a solenoid directional valve and is linked with a pressure sensor set in a suitable position. Step F: Debugging and acceptance, use a total station to monitor the initial elevation of the slab (8); simulate settlement by stacking sandbags, test the response time and support force of the jacking structure (6), and conduct 3 start-stop cycle tests of the mud system.

Images