Abutment buffer structure and construction method thereof

Abstract

The present invention provides a bridge abutment buffer structure and a construction method thereof. The bridge abutment buffer construction structure is provided with a buffer notch on the upper corner of the side where the abutment meets the foundation road. The length of the buffer notch is equal to the width of the abutment. A buffer groove is formed between the buffer notch and the foundation road. A buffer pad is provided in the buffer groove to play a buffering role. The structural design of the present invention can gradually change the support force received by the vehicle when it passes through the area, so that the vehicle can travel smoothly and effectively avoid the situation where the abutment jumps off. The construction method of the bridge abutment buffer structure includes the following steps: a. preparing a bridge abutment with a buffer notch; b. then installing the buffer pad into the buffer notch; c. driving a first screw into the plate surface on both sides of the bottom plate of the buffer pad that exceeds the rubber block; d. driving a second screw into the middle of one side of the rubber block of the buffer pad; e. finally installing the bridge abutment equipped with the buffer pad to the set construction position.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, in particular to an abutment buffer structure and a construction method thereof. Background Art

[0002] With the rapid development of transportation in my country, the mileage of various roads continues to increase, and the number of newly built and completed bridges of all types also increases year by year. The operational status of currently operational highways remains unsatisfactory, particularly the widespread phenomenon of "bridge bumping" at the junction of the subgrade highway and abutments. Bridge bumping refers to the uneven settlement of the subgrade highway and abutments, resulting in a bouncing and jolting phenomenon when a high-speed vehicle reaches the junction. The main hazards of bridge bumping include: impacting driving safety, reducing driving speeds, and accelerating damage to bridges and road surfaces. Therefore, addressing bridge bumping has become a challenging issue for road engineering technicians worldwide. Summary of the Invention

[0003] One of the purposes of the present invention is to provide a bridge abutment buffer structure to solve the problem of vehicle jumping at the bridge head due to inconsistent settlement of the foundation road and the bridge abutment.

[0004] A second object of the present invention is to provide a construction method for an abutment buffer structure.

[0005] One of the objects of the present invention is achieved as follows: a bridge abutment buffer structure, a buffer notch is opened at the upper corner of the side where the bridge abutment connects with the foundation road, the length of the buffer notch is equal to the width of the bridge abutment, a buffer groove is formed between the buffer notch and the foundation road, and a buffer pad for buffering is provided in the buffer groove.

[0006] The buffer pad includes a base plate for installation on the bottom of the buffer groove and a rubber block fixed on the base plate. The rubber block and the base plate are an integral structure, and the width of the rubber block is the same as the width of the buffer groove; the road surface of the foundation highway, the upper surface of the rubber block and the platform of the abutment are smoothly connected.

[0007] Preferably, the rubber block of the buffer pad is lined with a steel mesh.

[0008] Preferably, both sides of the bottom plate in the length direction extend beyond the rubber block, and a plurality of first screws for fixing the buffer pad on the abutment are installed on the extended plate surface.

[0009] Preferably, a plurality of second screws are provided in the middle of the buffer pad and penetrate from the side of the rubber block in contact with the foundation road, so as to achieve fixation between the buffer pad and the abutment.

[0010] Preferably, the length of the rubber block of the buffer pad is equal to the width of a lane, and a plurality of buffer pads are provided in the buffer groove along the length direction, and each buffer pad corresponds to a lane of the foundation road.

[0011] Preferably, the bottom of the buffer trough is inclined toward the foundation road.

[0012] The present invention provides an improved abutment buffer structure. The structural design between the abutment and the road allows vehicles to gradually change the stiffness of the support they experience as they pass through the area, shifting from the stiffness of the roadbed to the stiffness of the abutment. This allows for smooth vehicle travel and prevents the impact force generated by different stiffnesses, which can cause vehicle bouncing at the abutment. In short, the present invention improves the smoothness of the transition between the roadbed, pavement, and abutment, significantly reducing the incidence of vehicle bouncing at the bridgehead.

[0013] The second object of the present invention is achieved as follows: A construction method for a bridge abutment buffer structure comprises the following steps:

[0014] a. Prepare a bridge abutment with a buffer gap; the bottom surface of the buffer gap is inclined toward the side where the bridge abutment meets the foundation road;

[0015] b. Then, a buffer pad is installed in the buffer gap; the buffer pad includes a bottom plate for installation on the bottom surface of the buffer gap and a rubber block fixed to the bottom plate. The rubber block and the bottom plate are integrally structured, and the width of the rubber block is the same as the width of the buffer gap. The upper surface of the rubber block is flush with the abutment surface; and both sides of the bottom plate extend beyond the rubber block in the length direction.

[0016] c. Drive the first screws into the surfaces of the bottom plate of the buffer pad that extend beyond the rubber block on both sides to secure the buffer pad to the bottom surface of the buffer notch;

[0017] d. Drive the second screw through the middle of the rubber block of the buffer pad that contacts the road surface, so that the buffer pad is firmly fixed in the buffer gap;

[0018] e. Finally, install the abutment with the buffer pad to the set construction position so that the side with the buffer pad contacts the side of the foundation road, and the road surface of the foundation road, the upper surface of the buffer pad and the abutment surface are smoothly connected.

[0019] The rubber block of the buffer pad is lined with a steel wire mesh.

[0020] The length of the rubber block of the buffer pad is equal to the width of a lane. A plurality of buffer pads are arranged in the buffer gap along the length direction, and each buffer pad corresponds to a lane of the foundation road. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 yes Figure 1 Schematic diagram of the left view structure.

[0023] Figure 3 Schematic diagram of the force decomposition of the buffer structure after being impacted.

[0024] In the figure: 1, abutment; 2, base plate; 3, threaded hole; 4, second screw; 5, longitudinal steel wire spring; 6, transverse steel wire spring; 7, rubber block; 8, bridge; 9, foundation road; 10, first screw. DETAILED DESCRIPTION

[0025] Example 1: A bridge abutment buffer structure.

[0026] like Figure 1 、 Figure 2 As shown, the present invention provides a bridge abutment buffer structure. A buffer notch is provided at the upper corner of the side where the abutment 1 meets the foundation road 9. The length of the buffer notch is equal to the width of the abutment 1. A buffer groove is formed between the buffer notch and the foundation road 9. A buffer pad is provided in the buffer groove to provide a buffering effect.

[0027] like Figure 1 、 Figure 2 As shown, the buffer pad includes a bottom plate 2 for mounting on the bottom of the buffer groove and a rubber block 7 fixed on the bottom plate 2. The rubber block 7 and the bottom plate 2 are an integral structure, and the width of the rubber block 7 is the same as the width of the buffer groove. Figure 1 As shown, the pavement of the foundation road 9, the upper surface of the rubber block 7, and the platform of the abutment 1 are smoothly connected. To increase the elasticity and durability of the rubber block 7, the rubber block 7 of the buffer pad of the present invention is lined with a steel mesh. In this embodiment, the steel mesh is made of a plurality of transverse steel springs 6 and longitudinal steel springs 5 interlaced.

[0028] like Figure 2 As shown, both ends of the bottom plate 2 of the buffer pad along the length of the buffer groove extend beyond the rubber block 7, and a plurality of first screws 10 are installed on the surface of the bottom plate 2 at the extending ends to secure the buffer pad to the abutment 1. To ensure that the buffer pad is better secured within the buffer groove, a plurality of second screws 4 are penetrated through the middle portion of the buffer pad from the side where the rubber block contacts the foundation road 9. The second screws 4 pass through the rubber block 7 of the buffer pad, and the tails of the second screws 4 are screwed into threaded holes 3 provided in the ground of the buffer groove of the abutment 1, thereby securing the buffer pad to the abutment 1.

[0029] like Figure 2As shown, the length of the rubber block 7 of the buffer pad of the present invention is equal to the width of a lane, and a plurality of buffer pads are arranged along the length direction in the buffer groove, and each buffer pad corresponds to a lane of the foundation road 9. This can avoid the situation where a certain part is damaged and the entire system needs to be replaced to affect the passage of vehicles.

[0030] like Figure 1 As shown, the bottom of the buffer groove of the present invention is inclined toward the foundation road 9, and the second screw 4 is also arranged to be inclined toward the bridge 8 so as to more reasonably cope with the impact force.

[0031] When a vehicle passes through the abutment, the abutment will be affected by the impact force F given by the vehicle. Figure 3 Where F represents the decomposition of the impact force exerted by the vehicle on abutment 1; F1 is the horizontal component of the impact force, and F2 is the vertical component of the impact force. In the present invention, when a vehicle travels from the subgrade road 9 to abutment 1, it first encounters the buffer structure of the present invention. Therefore, F, F1, and F2 can be calculated using the following formula:

[0032] F1=F×cos(θ)

[0033] F2=F×sin(θ)

[0034]

[0035] In the above formula, θ is the inclination angle of the bottom of the buffer groove; M is the mass of the abutment 1; C is the damping coefficient of the rubber block 7 on which the transverse steel wire spring 6 and the longitudinal steel wire spring 5 are set; K is the stiffness coefficient of the rubber block 7 on which the transverse steel wire spring 6 and the longitudinal steel wire spring 5 are set; X is the displacement of the abutment; are the speed and acceleration of abutment 1, respectively.

[0036] This embodiment is based on a standard vehicle (BZZ-100). The test vehicle travels at a speed of 40 km / h. When passing through the abutment under different roadbed settlements, the vertical force and horizontal force exerted on the abutment of the present invention and the ordinary abutment are shown in Table 1.

[0037] Table 1 Mechanical comparison between the abutment of the present invention and the common abutment

[0038]

[0039] Table 1 shows that the abutment of the present invention generates approximately 4-6% less vertical force, 10-12% less horizontal force, 20-30% less vibration velocity, and 40-50% less acceleration than conventional abutments. While the reductions in vertical and horizontal forces are relatively small, the reductions in vibration velocity and acceleration are significant. Because the forces act in opposite directions, the acceleration imparted by the abutment to vehicles is also relatively small, significantly reducing vehicle vibration acceleration and improving driving comfort.

[0040] From the above data, it can be seen that after the vehicle passes through the buffer mechanism of the present invention, the support stiffness it receives changes gradually, which enables the vehicle to travel smoothly and does not generate different impact forces due to different stiffness, resulting in different settlements, thus avoiding the occurrence of bridge abutment jumping phenomenon.

[0041] Example 2: A construction method for a bridge abutment buffer structure.

[0042] The present invention provides a construction method for a bridge abutment buffer structure, the method comprising the following steps:

[0043] S1. Prepare the abutment 1 with a buffer gap as described in Example 1; the bottom surface of the buffer gap is inclined toward the side where the abutment 1 meets the foundation road 9;

[0044] S2. Then, a buffer pad is installed in the buffer gap; the buffer pad includes a base plate 2 for installation on the bottom surface of the buffer gap and a rubber block 7 fixed to the base plate 2. The rubber block 7 and the base plate 2 are integrally structured. The width of the rubber block 7 is the same as the width of the buffer gap. The interior of the rubber block 7 is lined with a wire mesh, which is made of transverse steel wire springs 6 and longitudinal steel wire springs 5 that are overlapped. The upper surface of the rubber block 7 is flush with the surface of the abutment 1. In the length direction, both sides of the base plate 2 extend beyond the rubber block 7.

[0045] S3. Drive first screws 10 into the surfaces of the bottom plate 2 of the buffer pad that extend beyond the rubber block 7 on both sides, so that the buffer pad is fixed to the bottom surface of the buffer notch;

[0046] S4. Drive a second screw 4 into the middle of the side of the rubber block 7 of the buffer pad that contacts the foundation road 9, so that the buffer pad is firmly fixed in the buffer gap;

[0047] S5. Finally, the abutment 1 equipped with the buffer pad is installed at the set construction position, so that the side equipped with the buffer pad contacts the side of the foundation road 9, and the road surface of the foundation road 9, the upper surface of the buffer pad and the platform of the abutment 1 are smoothly connected. In this embodiment, the length of the rubber block 7 of the buffer pad is equal to the width of one lane. Several buffer pads are arranged along the length direction in the buffer gap, and each buffer pad corresponds to a lane of the foundation road. Figure 2 shown.

Claims

1. A bridge abutment buffer structure, characterized in that A buffer notch is provided at the upper corner of the side where the abutment meets the foundation road. The length of the buffer notch is equal to the width of the abutment. A buffer groove is formed between the buffer notch and the foundation road. A buffer pad is provided in the buffer groove to provide a buffering effect. The buffer pad includes a bottom plate for installation on the bottom of the buffer groove and a rubber block fixed on the bottom plate. The rubber block and the bottom plate are integrally structured, and the width of the rubber block is equal to the width of the buffer groove. The road surface of the foundation road, the upper surface of the rubber block and the platform surface of the abutment are smoothly connected. The rubber block of the buffer pad is lined with a steel mesh; the steel mesh is made of a plurality of transverse steel springs and longitudinal steel springs interlaced; The bottom of the buffer trough is inclined toward the foundation road; Both ends of the bottom plate in the length direction of the buffer groove extend beyond the rubber block, and a plurality of first screws for fixing the buffer pad to the abutment are installed on the extended plate surface; A plurality of second screws are provided in the middle of the buffer pad and penetrate from the side of the rubber block that contacts the foundation road. The nail tails of the second screws are screwed into the abutment to achieve fixation between the buffer pad and the abutment. When a vehicle passes through the abutment buffer structure, the support stiffness it receives gradually changes, that is, the stiffness of the road surface on the roadbed gradually changes to the stiffness of the abutment, so that the vehicle can travel smoothly and will not cause different impact forces due to different stiffness, resulting in the phenomenon of jumping off the abutment.

2. The abutment buffer structure according to claim 1, characterized in that: The length of the rubber block of the buffer pad is equal to the width of a lane. A plurality of buffer pads are arranged in the buffer groove along the length direction, and each buffer pad corresponds to a lane of the foundation road.

3. A construction method for the abutment buffer structure according to claim 1, characterized in that: The following steps are involved: a. The abutment according to claim 1 is provided; the bottom surface of the buffer notch of the abutment is inclined toward the side where the abutment meets the foundation road; b. Then, a buffer pad is installed in the buffer gap; the buffer pad includes a bottom plate for installation on the bottom surface of the buffer gap and a rubber block fixed to the bottom plate, the rubber block and the bottom plate are integrally structured, the width of the rubber block is the same as the width of the buffer gap; the upper surface of the rubber block is flush with the platform surface of the abutment; In the length direction, both sides of the bottom plate extend beyond the rubber block; the rubber block of the buffer pad is lined with a steel mesh; c. Drive the first screws into the surfaces of the bottom plate of the buffer pad that extend beyond the rubber block on both sides to secure the buffer pad to the bottom surface of the buffer notch; d. Drive the second screw through the middle of the rubber block of the buffer pad that contacts the road surface, so that the buffer pad is firmly fixed in the buffer gap; e. Finally, install the abutment with the buffer pad to the set construction position so that the side with the buffer pad contacts the side of the foundation road, and the road surface of the foundation road, the upper surface of the buffer pad and the abutment surface are smoothly connected.

4. The construction method of the abutment buffer structure according to claim 3 is characterized in that: The length of the rubber block of the buffer pad is equal to the width of a lane. A plurality of buffer pads are arranged in the buffer gap along the length direction, and each buffer pad corresponds to a lane of the foundation road.

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