Transverse assembly type self-resetting energy dissipation anti-seismic stop block and construction method thereof

Abstract

The invention discloses a transverse assembly type self-resetting energy-dissipation anti-seismic stop block and a construction method thereof. The transverse assembly type self-resetting energy-dissipation anti-seismic stop block comprises a buffer rubber block, a steel-plate-wrapped concrete stop block body, prestressed steel bars, a replaceable energy-dissipation soft steel device and an assembly type cover beam. The buffer rubber block is fixed on the steel plate-wrapped concrete stop block of the steel plate through a bolt and a nut; the steel plate encased concrete check block can be prefabricated and detachably arranged on the assembly type bent cap; the pre-stressed steel bars are used for connecting the prefabricated check blocks with the assembly type cover beam through a bonded post-tensioned pre-stress method and epoxy resin glue; the replaceable energy-dissipation soft steel device comprises angle steel and energy-dissipation stiffening ribs and is detachably arranged on the assembly type bent cap. In addition, the invention provides a construction method of the transverse assembly type self-resetting energy dissipation anti-seismic stop block. Rapid standardized prefabrication can be achieved, and on-site wet operation workload is reduced; when serious transverse displacement of the main beam occurs under the action of an earthquake, the functions of collision buffering, step-by-step energy consumption, structure self-resetting, quick replacement and the like can be achieved, and the requirements for the transverse limiting function of the beam body structure under different conditions can be met.

Description

Technical Field

[0001] The invention relates to the technical field of bridge earthquake resistance, and in particular to a transversely assembled self-resetting energy-absorbing earthquake-resistant stopper and a construction method thereof. Background Art

[0002] According to statistics from the Ministry of Transport, my country's small and medium-span bridges account for more than 85% of the total number, of which beam bridges account for the vast majority. This type of bridge most commonly uses integral cast-in-place reinforced concrete blocks, and the construction method is: reserve a steel cage for binding the blocks during the construction of the cap beam, and cast the blocks after the concrete strength of the cap beam reaches the requirements. The integral cast-in-place blocks have a simple construction process, which can limit the transverse displacement of the main beam, and to a certain extent affect the damage level of the bridge's lower structure. China's small-span beam bridges often use plate rubber bearings without anchorage. Under the action of earthquakes, the bearings are prone to sliding, causing the upper main beam structure to shift laterally and collide with the blocks.

[0003] The integral stopper is designed as a sacrificial component for earthquake-resistant structures. After colliding with the main beam, it often suffers oblique shear failure and horizontal shear failure, which may lead to beam falling accidents in severe cases. In the post-earthquake repair process, it is necessary to drill holes in the cap beam, plant reinforcement, and cast new earthquake-resistant stops. This method is time-consuming and labor-intensive, and it is difficult to achieve effective connection between the new stopper and the old cap beam. The earthquake-resistant reinforcement effect is not obvious, which creates great resistance to the repair and replacement of the post-earthquake stopper. Summary of the invention

[0004] In view of the deficiencies in the existing technology, the purpose of the present invention is to provide a transversely assembled self-resetting energy-absorbing seismic block and a construction method thereof, which is based on the seismic design concept of bridges of "multiple lines of defense and graded energy dissipation", realizes step-by-step energy dissipation of multiple lines of defense, enhances the seismic and impact resistance of the block structure, and can be quickly replaced during post-earthquake repair.

[0005] The purpose of the present invention can be achieved by the following technical solutions: The present invention proposes an ultra-high performance concrete bridge seismic stopper, including a buffer rubber block, a steel plate-covered concrete stopper, prestressed steel bars, a replaceable energy-absorbing soft steel device, and an assembled cap beam. Under the action of an earthquake, if the main beam does not slip, the present invention can achieve rapid recovery through the good self-reset ability of the post-tensioned prestressed connection structure; if the main beam slips, the present invention can dissipate the collision force through the buffering effect of the rubber block, and further dissipate energy through the swing system and the replaceable energy-absorbing soft steel device. The specific scheme is as follows: In the first aspect, an ultra-high performance concrete bridge seismic stopper, the structure includes a buffer rubber block, a steel plate-covered concrete stopper, prestressed steel bars, a replaceable energy-absorbing soft steel device, and an assembled cap beam; The buffer rubber block is detachably connected to the steel plate-clad concrete block; the steel plate-clad concrete block is detachably connected to the cap beam; the prestressed steel bars penetrate the steel plate-clad concrete block and the cap beam; the replaceable energy-absorbing soft steel device is detachably connected to the steel plate-clad concrete block and the cap beam.

[0006] Furthermore, the outside of the buffer rubber block is a hollow hemispherical rubber block, and the inside is filled with yielding material; the buffer rubber block and the steel plate-wrapped concrete stopper are connected by bolts.

[0007] Furthermore, the steel plate-clad concrete block is connected to the assembled cap beam by the post-tensioning method, a prestressed tendon pipe is provided inside the block, and energy-absorbing steel bars are embedded at the bottom; a plurality of bolt holes are reserved outside the steel plate-clad concrete block, and the holes are respectively arranged on the bridge side and the back bridge side.

[0008] Furthermore, the replaceable energy-absorbing soft steel device includes angle steel and energy-absorbing stiffening ribs. The angle steel is arranged on the back bridge side of the steel plate concrete block and is fixed to the bottom of the side of the steel plate concrete block and the top of the assembled cap beam by bolts; the angle steel is reserved with multiple bolt holes, and the number of holes is consistent with the number of bolt holes reserved on the back bridge side of the steel plate concrete block; the energy-absorbing stiffening ribs are arranged on the inner side of the angle steel and are connected and fixed to the angle steel by double-sided angle welds; the angle steel and the energy-absorbing stiffening ribs are both made of soft steel.

[0009] Furthermore, a metal corrugated pipe is arranged in the assembled cap beam, and the embedded energy-absorbing steel bars of the steel plate-wrapped concrete block are inserted into the pipe, and the steel plate-wrapped concrete block and the assembled cap beam are connected into a whole after grouting.

[0010] Furthermore, the steel plate-clad concrete block and the assembled cap beam are connected as a whole through the interlaced anchoring of prestressed tendons and ordinary steel bars.

[0011] In a second aspect, a construction method of an assembled standardized mild steel buffer shock-absorbing energy-absorbing anti-seismic block comprises the following steps: S1. Prefabrication of steel plate-wrapped concrete blocks: Obtain thin steel plates and prestressed steel pipes around the blocks, tie up the block reinforcement cage, reserve bottom anchor steel bars, set up formwork at the bottom and then pour, and remove the formwork and drill holes after the strength reaches the standard.

[0012] S2. Installation of buffer rubber blocks: obtain a hollow hemispherical rubber block and several bolts, fill the interior with yielding material, place the rubber block close to the steel plate concrete block, and fix it with bolts.

[0013] S3. Prefabrication of replaceable energy-absorbing mild steel device: obtain angle steel of suitable size, use mild steel material to make energy-absorbing stiffening ribs, and fix the energy-absorbing stiffening ribs to the angle steel through double-sided fillet welds.

[0014] S4. Installation of replaceable energy-absorbing soft steel device: Obtain several bolts, fix the replaceable energy-absorbing soft steel device to the bottom of the back bridge side of the steel plate-wrapped concrete block, and drive the bolts into the block to complete the connection and fixation.

[0015] S5. Construction of prefabricated cap beam: obtain a number of metal corrugated pipes and prestressed tendon pipes, and pre-embed the metal corrugated pipes and prestressed tendon pipes during the cap beam construction.

[0016] S6. Installation of steel plate-clad concrete blocks: hoist the steel plate-clad concrete blocks to the top of the assembled cap beam, insert the reserved steel bars of the blocks into the metal corrugated pipes embedded in the cap beam, and then inject grout. After the strength of the grouting material reaches the standard, connect the segments tightly through post-tensioned prestressed tendons, and anchor the two ends of the prestressed tendons to the blocks and the cap beam respectively.

[0017] Compared with the prior art, the present invention has the following advantages: In the present invention, the hemispherical rubber block and the yielding filling material inside it effectively dissipate the impact force of the main beam during deformation, avoid the rigid collision between the main beam and the block, avoid major damage to the beam body, and become the first line of defense against earthquakes and shocks.

[0018] In the present invention, the outer steel plate-wrapped concrete block forms a swing system due to the self-resetting ability provided by the prestressed tendons, and the bottom joint can be opened and closed. At the same time, the deformation of the energy-absorbing steel bars further reduces the input of seismic energy and collision energy, and the elastic-plastic deformation of the external replaceable energy-absorbing soft steel device suppresses the deformation damage of the joint part. In the present invention, the steel plate wrapped around the outside of the stopper can not only slow down the cracking process of the concrete and improve the durability of the concrete structure, but also reduce the deformation of the concrete structure and enhance the bearing capacity; In the present invention, when the stopper and the beam body collide severely, the metal corrugated pipe is pre-buried in the assembled cap beam to ensure that the yield position of the energy-absorbing steel bar is located inside the stopper. When replacing it later, the bolts can be directly removed and the concrete in the corrugated pipe can be cleared to achieve rapid replacement. In the present invention, when the bottom joint of the steel plate-clad concrete block opens, the external replaceable energy-absorbing soft steel device undergoes plastic deformation under the lateral force, which can dissipate energy on the one hand and control the opening amplitude of the back bridge side joint on the other hand.

[0019] The present invention complies with the bridge seismic design concept of "multi-line defense and graded energy consumption", has a reasonable structural form, clear force characteristics, and a clear force transmission path, and is easy to achieve standardized production.

[0020] The invention has reliable quality, is easy to install, and has strong practicality and convenience. At the same time, the material is easy to obtain and can be purchased. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1Elevation view of the horizontally assembled self-resetting energy-absorbing and anti-seismic stopper Figure 2 Plan view of the horizontally assembled self-resetting energy-absorbing and anti-vibration stopper Figure 3 Schematic diagram of the deformation of the transversely assembled self-resetting energy-absorbing and anti-vibration stopper after a collision Figure 4 Schematic diagram of replaceable energy-absorbing soft steel device Figure 5 Prefabrication process for horizontally assembled self-resetting energy-absorbing and anti-seismic stoppers Figure 6 Installation process of horizontal assembled self-resetting energy-absorbing and anti-seismic stopper In the figure: 1. Buffer rubber block, 101. Hollow hemispherical rubber block, 102. Yield-prone filling material, 103. Bolt, 104. Perforated steel plate, 2. Concrete block with steel plate, 201. Reinforced concrete block, 202. Outer soft steel plate, 203. Prestressed channel, 204. Energy-absorbing steel bar, 3. Replaceable energy-absorbing soft steel device 301. Energy-absorbing stiffening rib, 302. Angle steel, 303. Anchor bolt, 4. Prefabricated cap beam, 401. Cap beam, 402. Metal corrugated pipe 5. Post-tensioned prestressed tendons, 501. Prestressed tendons, 502. Prestressed anchor Specific implementation plan

[0022] The present invention is further described below in conjunction with the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and a detailed structural description and a specific installation and construction process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0023] A transversely assembled self-resetting energy-absorbing and anti-seismic stop block structure includes a buffer rubber block 1, a steel plate-encased concrete stop block 2, a replaceable energy-absorbing soft steel device 3, an assembled cap beam 4 and post-tensioned prestressed tendons 5; the buffer rubber block 1 and the replaceable energy-absorbing soft steel device 3 are fixedly connected to the steel plate-encased concrete stop block 2 by bolts, and the steel plate-encased concrete stop block 2 and the assembled cap beam 4 are connected by post-tensioned prestressed tendons 5 and a corrugated pipe 402.

[0024] The steel plate-wrapped concrete block 2 includes a reinforced concrete block 201 and a soft steel plate-wrapped outer block 202. A prestressed steel bar pipe 203 is arranged inside the block, and a pre-buried energy-absorbing steel bar 204 is arranged at the bottom. The buffer rubber block 1 includes a hemispherical rubber block 201, a yielding material filler 202, a bolt 203 and a perforated steel plate 204. The hemispherical rubber block 201 is connected to the perforated steel plate 204 by a thermosetting adhesive, and the rubber block energy-absorbing device 1 is fixedly connected to the steel plate-wrapped concrete block 2 by bolts.

[0025] like Figure 5As shown, the main production process of the steel plate-wrapped concrete block 2 is as follows: make the block with a soft steel plate 202 wrapped around it, tie up the block steel cage, set up a prestressed pipe 203, use the outer steel plate as the block template to pour concrete, and drill bolt holes at the designed position after the strength reaches the standard; connect the hemispherical rubber block 201 to the steel plate through thermosetting glue, and then fix it to the bridge side of the block through bolts 103; and fix the replaceable energy-absorbing soft steel device 3 to the bottom of the back bridge side of the block through bolts 303.

[0026] like Figure 6 As shown, the main installation process of the transverse assembled self-resetting energy-absorbing and seismic-resistant block is as follows: the prefabricated steel plate-clad concrete block 2 is hoisted to the top of the assembled cap beam 4, and the energy-absorbing steel bars 204 reserved in the block are inserted into the metal corrugated pipe 402 embedded in the assembled cap beam for grouting. After the strength of the grouting material reaches the standard, the segments are tightly connected by post-tensioned prestressed tendons 501, and the two ends of the prestressed tendons are anchored to the block and the cap beam respectively.

[0027] like Figure 3 As shown, when the block collides with the main beam, the force process of the transverse assembled self-resetting energy-absorbing and seismic-resistant block is as follows: the buffer rubber block 1 first contacts the beam body, and the two will gradually disperse from point-to-surface contact to surface-to-surface contact, the hemispherical rubber block 101 is fully compressed, and the internal easy-to-yield filling material 102 reaches the yield strength, and the energy generated by the collision force is effectively dissipated; the block 201 suppresses the occurrence of structural cracks under the constraint of the outer steel plate 202, and the joint between the block 2 and the cap beam 4 opens. The block 2 forms a "swinging" energy dissipation system under the action of the prestressed tendons 5, and the energy-absorbing steel bars 204 connected by the corrugated tube 402 fully participate in the deformation energy dissipation; at the same time, with the opening of the joint between the block and the cap beam, the replaceable energy-absorbing soft steel device 3 on the back bridge side is deformed, and the energy-absorbing stiffening ribs 301 and the angle steels 302 are both made of soft steel, and their plastic deformation is fully utilized to achieve the purpose of energy dissipation.

Claims

1. A transversely assembled self-resetting energy-absorbing and anti-vibration stopper, characterized in that: It includes buffer rubber blocks, steel plate-covered concrete blocks, prestressed steel bars, replaceable energy-absorbing soft steel devices and assembled cap beams; The buffer rubber block is detachably connected to the steel plate-clad concrete block; the steel plate-clad concrete block is detachably connected to the cap beam; the prestressed steel bars penetrate the steel plate-clad concrete block and the cap beam; the replaceable energy-absorbing soft steel device is detachably connected to the steel plate-clad concrete block and the cap beam.

2. A transversely assembled self-resetting energy-absorbing and anti-vibration stopper according to claim 1, characterized in that: The buffer rubber block includes a hollow hemispherical rubber block, a yielding filling material, bolts, and a perforated steel plate. The outside of the buffer rubber block is a hemispherical hollow rubber block, and the inside of the buffer rubber block is filled with the yielding material. The hemispherical hollow rubber block is connected to the perforated steel plate by a thermosetting adhesive, and the rubber block and the steel plate-wrapped concrete block are connected by bolts.

3. According to claim 1, a transversely assembled self-resetting energy-absorbing and anti-vibration stopper is characterized in that: The steel plate-clad concrete block is connected to the assembled cap beam by post-tensioned prestressed tendons. A prestressed tendon channel is provided inside the steel plate-clad concrete block. Embedded energy-absorbing steel bars are provided at the bottom of the steel plate-clad concrete block. A plurality of bolt channels are reserved outside the steel plate-clad concrete block, and the bolt channels are respectively arranged on the bridge side and the back bridge side.

4. A transversely assembled self-resetting energy-absorbing and anti-vibration stopper according to claim 3, characterized in that: The prestressed steel bars penetrate and connect the steel plate-clad concrete blocks and the cap beam.

5. The transversely assembled self-resetting energy-absorbing and anti-vibration stopper according to claim 1 is characterized in that: The replaceable energy-absorbing soft steel device comprises angle steel and energy-absorbing stiffening ribs.

6. The angle steel is arranged on the back bridge side of the steel plate-clad concrete block, and the angle steel is fixed to the bottom of the side of the steel plate-clad concrete block and the top of the assembled cap beam by bolts; the angle steel is reserved with multiple bolt holes, and the number of the bolt holes is consistent with the number of bolt holes reserved on the back bridge side of the steel plate-clad concrete block; the energy-absorbing stiffening rib is arranged on the inner side of the angle steel, and the energy-absorbing stiffening rib is connected and fixed to the angle steel by double-sided angle welds; the angle steel and the energy-absorbing stiffening rib are both made of soft steel.

7. The transversely assembled self-resetting energy-absorbing and anti-vibration stopper according to claim 1 is characterized in that: The assembled cap beam is provided with a metal corrugated pipe, into which the embedded energy-absorbing steel bars of the steel plate-wrapped concrete block are inserted, and after grouting, the steel plate-wrapped concrete block and the assembled cap beam are connected into a whole.

8. The transversely assembled self-resetting energy-absorbing and anti-vibration stopper according to claim 1 is characterized in that: The steel plate-clad concrete block and the assembled cap beam are connected as a whole through interlaced anchoring of prestressed tendons and ordinary steel bars.

9. The construction method of the transverse assembled self-resetting energy-absorbing anti-seismic stopper according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Prefabrication of steel plate-wrapped concrete blocks: obtain soft steel plates and prestressed steel pipes around the blocks, tie up the block reinforcement cage, reserve bottom anchor energy-absorbing steel bars, set up formwork at the bottom and then pour, and remove the formwork and drill holes after the strength reaches the standard. 10.S2. Installation of buffer rubber block: obtain a hemispherical hollow rubber block and several bolts, fill the inside with yielding material, place the rubber block close to the steel plate concrete block, and fix it with bolts. 11.S3. Prefabrication of replaceable energy-absorbing mild steel device: Obtain angle steel of suitable size, use mild steel material to make energy-absorbing stiffening ribs, and fix the energy-absorbing stiffening ribs to the angle steel through double-sided fillet welds. 12.S4. Installation of replaceable energy-absorbing soft steel device: Obtain several bolts, fix the replaceable energy-absorbing soft steel device to the bottom of the back bridge side of the steel plate-wrapped concrete block, and drive the bolts into the block to complete the connection and fixation. 13.S5. Prefabricated cap beam construction: Obtain a number of metal corrugated pipes and prestressed tendon pipes, and pre-embed the metal corrugated pipes and prestressed tendon pipes during the cap beam construction. 14.S6. Installation of steel plate-clad concrete blocks: hoist the steel plate-clad concrete blocks to the top of the assembled cap beam, insert the reserved steel bars of the blocks into the metal corrugated pipes embedded in the cap beam, and then inject grout. After the strength of the grouting material reaches the standard, the blocks and the cap beam are tightly connected by post-tensioned prestressed tendons. The two ends of the prestressed tendons are anchored at the top of the blocks and the bottom of the cap beam respectively.

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