CN-121992712-A - Toughness antidetonation dog structure based on buckling gradually steel casing

CN121992712ACN 121992712 ACN121992712 ACN 121992712ACN-121992712-A

Abstract

The invention provides a ductile anti-seismic stop block structure based on an gradual buckling steel sleeve and based on the gradual buckling steel sleeve, and belongs to the technical field of bridge anti-seismic. The periphery of the gradually-buckled steel sleeve is sequentially provided with a reinforcing ring, a thin-wall ring and a reinforcing ring, and when the gradually-buckled steel sleeve is subjected to axial pressure, a plurality of thin-wall rings sequentially generate radial bulging, so that energy consumption is realized. After the anchor bolt passes through the gradual buckling steel sleeve, the stop block is fixed with the embedded bolt sleeve, so that the novel tough anti-seismic stop block with stable plastic mode and easy restoration after earthquake is formed. The stop block structure provided by the invention only uses the gradual buckling steel sleeve to compress and consume energy, and further amplifies the displacement of the gradual buckling steel sleeve by using the lever principle, the stop block main body keeps elastic, and the stop block main body can be recovered only by replacing a new anchoring element after earthquake, so that the stop block structure has remarkable toughness advantage.

Inventors

GUAN ZHONGGUO
WANG RUILONG
ZHANG JUNJIE
QIU JUN

Assignees

同济大学
上海市政工程设计研究总院（集团）有限公司

Dates

Publication Date: 20260508
Application Date: 20260323

Claims (6)

1. The ductile anti-seismic stop block structure based on the gradual buckling steel sleeve is characterized by comprising a stop block, the gradual buckling steel sleeve, an anchor bolt and a bolt sleeve pre-buried in the main beam bottom plate; the stop block is provided with a bolt hole, the anchor bolt sequentially passes through the gradual buckling steel sleeve and the bolt hole to be fixed with the bolt sleeve through threads, the gradual buckling steel sleeve is abutted between the stop block and a nut of the anchor bolt, and a gap is reserved between the side edge of the stop block and the support cushion stone; The periphery of the gradually-buckled steel sleeve is provided with a series structure with alternately distributed reinforcing rings and thin-wall rings, and when the gradually-buckled steel sleeve is stressed to generate shaft pressure, the thin-wall rings are radially bulged, so that energy consumption is realized.
2. The ductile anti-seismic stop structure based on a progressively buckling steel bushing according to claim 1, wherein when the radial buckling of a single thin-wall ring reaches a limit state, the inner wall buckling of the thin-wall ring is abutted, and the axial pressure and deformation are transferred to the next thin-wall ring, so that progressively buckling energy consumption is realized.
3. The ductile vibration-resistant stop structure based on a progressively buckling steel bushing according to claim 1 wherein the stop comprises a bottom plate, a stiffening plate and a back plate, the stiffening plate is welded and fixed with the bottom plate and the back plate, and the stiffening plate is welded at the middle part of the bottom plate.
4. The ductile vibration-resistant stop block structure based on the gradually-buckled steel sleeve according to claim 3, wherein the number of the bolt holes is multiple, the bolt holes are symmetrically arranged on two sides of the stiffening plate respectively, and each bolt hole is correspondingly provided with one gradually-buckled steel sleeve.
5. The ductile vibration-resistant stop structure based on a progressively buckling steel bushing according to claim 3 wherein a cushion pad is provided on the back side of the back plate.
6. The ductile vibration-resistant stop structure based on graded-buckling steel bushings of claim 4, wherein the number of graded-buckling bushings, the section height, the radius-thickness ratio and the section number of each graded-buckling bushing are adjusted according to girder weight, girder displacement and vibration-resistant requirements.

Description

Toughness antidetonation dog structure based on buckling gradually steel casing Technical Field The invention belongs to the technical field of bridge earthquake resistance, and particularly relates to a ductile earthquake-resistant stop block structure based on a gradually buckling steel sleeve. Background Most areas of China are in the middle of the European seismic zone and the Pacific seismic zone, and a few areas are in the European seismic zone. The seismic area is widely distributed, and belongs to the country with frequent earthquakes. In the work of earthquake relief, the earthquake-proof work of life line engineering is of great importance, especially the bridge in important transportation junction engineering will cause great influence to rescue after disaster and material personnel transportation once being destroyed. The seismic randomness is great, and the situation of exceeding the fortification earthquake is great. Therefore, the displacement shock hazard of the bridge structure is quite common, the support and the limiting device are damaged more, and the damage of the support connecting device can cause the overlarge displacement of the main beam so as to cause the falling beam. A large number of earthquake damages and researches show that the setting of the beam falling prevention stop blocks can effectively reduce the risk of beam falling and the earthquake damages of bridge structures. Researches show that under the condition of strong vibration, only the elastic-plastic stop block with strong energy consumption capability and stable plastic deformation can effectively control the relative displacement of the pier beam after the support is damaged, thereby obviously reducing the risk of beam falling. However, the current stopper has the following problems: The existing bridge adopts concrete stop blocks, is only one structural measure for preventing the bridge from falling, has small deformability and poor energy consumption capability, is extremely easy to generate brittle fracture under the action of strong earthquake, and has poorer actual falling prevention Liang Gongxiao. The existing check block generally adopts a welding structure similar to a bracket, so that the welding seam between the bottom plate and the check block is easily sheared and damaged, and meanwhile, the bracket-type steel structure is short, small and thick, and the plasticity of the bracket-type steel structure is difficult to utilize. After the dog breaks, the whole dog needs to be replaced, and the replacement and repair are inconvenient, so that the economy is poor. Disclosure of Invention The invention aims to solve the problems of poor beam falling prevention effect, difficult plasticity utilization and inconvenient replacement, and provides a ductile anti-seismic stop block structure based on a gradual buckling steel sleeve, which comprises a stop block, a gradual buckling steel sleeve, an anchor bolt and a bolt sleeve pre-buried in a main beam bottom plate; The stop block is provided with a bolt hole, the anchor bolt sequentially passes through the gradual buckling steel sleeve and the bolt hole to be fixed with the bolt sleeve through threads, the gradual buckling steel sleeve is abutted between the stop block and a nut of the anchor bolt, and a gap is reserved between the side edge of the stop block and the support cushion stone; The periphery of the gradually-buckled steel sleeve is provided with a series structure with alternately distributed reinforcing rings and thin-wall rings, and when the gradually-buckled steel sleeve is stressed to generate shaft pressure, the thin-wall rings are radially bulged, so that energy consumption is realized. Further, when the radial buckling of the single thin-wall ring reaches a limit state, the buckling of the inner wall of the thin-wall ring is abutted, and the axial pressure and deformation are transmitted to the next thin-wall ring, so that gradual buckling energy consumption is realized. Further, the dog includes bottom plate, stiffening plate and backplate, and the stiffening plate all welds fixedly with bottom plate and backplate, and the stiffening plate welds in the bottom plate middle part. Further, the number of the bolt holes is multiple, the bolt holes are symmetrically arranged on two sides of the stiffening plate respectively, and each bolt hole is correspondingly provided with a gradually buckling steel sleeve. Further, the number of the gradually buckling sleeves, the sectional height, the radial thickness ratio and the sectional number of the single gradually buckling sleeve are adjusted according to the girder weight, the girder displacement and the earthquake resistance requirement. Further, the back side of the backboard is provided with a buffer backing plate. Compared with the prior art, the invention has the beneficial effects that: The gradually buckling steel sleeve provided by the invention is used as a plastic source in the deformation pr