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CN-121992740-A - Drawer type anti-collision energy absorbing structure of concrete guardrail of expressway

CN121992740ACN 121992740 ACN121992740 ACN 121992740ACN-121992740-A

Abstract

The invention discloses a drawer type anti-collision energy absorbing structure of a concrete guardrail of an expressway, which belongs to the technical field of expressway traffic protection, wherein a ground buried pipe is arranged below a guardrail main body, a drawer type buffer assembly is arranged in the ground buried pipe, the drawer type buffer assembly comprises a sliding plate, a moving rod, a moving plate, a second spring, a guide sleeve, a piston ring and a push rod, non-Newtonian liquid is contained in the ground buried pipe, when a vehicle collides, the guardrail main body drives the sliding plate to slide, the moving rod drives the moving plate to compress the second spring to realize first-stage buffering, the moving rod continuously moves to enable the push rod to push the piston ring to squeeze the non-Newtonian liquid to realize second-stage buffering, and the damping force of the second-stage buffering is increased in a nonlinear manner along with the increase of the collision speed.

Inventors

  • GAO LONGXIANG
  • HAN DONGHUI
  • LV JIANWEI
  • Hui Xiangguo
  • GUO YAN
  • JIANG YINGHUI
  • Fu Peilei
  • ZHENG PENG
  • WANG PEIJIAN
  • LI YUANSHAO

Assignees

  • 山西诺信交通建设工程有限公司

Dates

Publication Date
20260508
Application Date
20260331

Claims (10)

  1. 1. A highway concrete guardrail drawer type crashproof energy absorbing structure, characterized by comprising: A guardrail main body (1); The buried pipe (3) is arranged below the guardrail main body (1); drawer type buffer unit (4) set up in buried pipe (3), drawer type buffer unit (4) include: a sliding plate (401) fixedly connected to the outer wall of the bottom end of the guardrail main body (1); A moving rod (402) fixedly connected to the bottom end of the sliding plate (401); at least one moving plate (403) fixedly connected to the outer side of the moving rod (402); At least one second spring (4010), one end of which is fixedly connected to the inner wall of the buried pipe (3), and the other end of which is fixedly connected to the movable plate (403); A guide sleeve (406) fixedly connected to the inner wall of the buried pipe (3); A piston ring (407) which is mounted between the guide sleeve (406) and the buried pipe (3) in a sealing manner; A push rod (408) fixedly connected to the outer side of the movable rod (402) and abutted against the piston ring (407); The non-Newtonian liquid is contained in the buried pipe (3); The drawer type buffer assembly (4) is configured to enable the guardrail main body (1) to drive the sliding plate (401) to slide when a vehicle collides, enable the movable rod (402) to drive the movable plate (403) to compress the second spring (4010) to achieve first-stage buffer, enable the movable rod (402) to continue to move, enable the ejector rod (408) to push the piston ring (407) to squeeze the non-Newtonian liquid to achieve second-stage buffer, and enable damping force of the second-stage buffer to be increased in a nonlinear manner along with the increase of the collision speed.
  2. 2. A highway concrete guardrail drawer-type crash-energy-absorbing structure as claimed in claim 1, wherein said drawer-type cushioning assembly (4) further comprises: a second guide rod (409) fixedly connected to the inner wall of the buried pipe (3); the moving plate (403) is provided with a second guide hole (404), and the second guide rod (409) is sleeved in the second guide hole (404).
  3. 3. The highway concrete guardrail drawer-type anti-collision energy absorbing structure according to claim 2, wherein the second spring (4010) is sleeved outside the second guide rod (409).
  4. 4. The highway concrete guardrail drawer-type anti-collision energy absorbing structure according to claim 1, wherein a plurality of moving plates (403) are provided, the plurality of moving plates (403) are arranged at intervals along the axial direction of the moving rod (402), and each moving plate (403) is correspondingly provided with at least one second spring (4010).
  5. 5. The highway concrete guardrail drawer-type anti-collision energy absorbing structure according to claim 1, wherein a sliding groove (405) is formed in the top end of the buried pipe (3) corresponding to the sliding plate (401), and the sliding plate (401) is slidably arranged in the sliding groove (405).
  6. 6. The drawer-type anti-collision energy absorbing structure of the highway concrete guardrail according to claim 1, wherein a supplementary pipe (9) is connected to the buried pipe (3) in a penetrating way, and a valve (10) is arranged on the supplementary pipe (9).
  7. 7. The highway concrete guardrail drawer-type anti-collision energy absorbing structure according to claim 1, wherein a connecting plate (7) is fixedly connected to the outer side of the buried pipe (3), and bolts (8) are arranged on the connecting plate (7) in a penetrating mode.
  8. 8. The highway concrete guardrail drawer-type crash-resistant energy-absorbing structure of claim 1, wherein said non-newtonian fluid is a shear thickening fluid.
  9. 9. The highway concrete guardrail drawer-type crash-resistant energy-absorbing structure of claim 1, wherein said piston ring (407) is an elastic piston ring.
  10. 10. The highway concrete guardrail drawer-type crash-proof energy-absorbing structure of claim 1, wherein a plurality of ejector rods (408) are provided, and a plurality of ejector rods (408) are uniformly distributed along the circumferential direction of the movable rod (402).

Description

Drawer type anti-collision energy absorbing structure of concrete guardrail of expressway Technical Field The invention relates to the technical field of expressway traffic protection, in particular to a drawer type anti-collision energy absorption structure of an expressway concrete guardrail, and especially relates to an expressway concrete guardrail capable of realizing stepped energy absorption through cooperation of a spring and non-Newtonian liquid. Background The highway concrete guardrail is a core component of traffic infrastructure and is mainly used for safety protection and isolation of highways. With the continuous increase of expressway mileage and continuous increase of vehicle keeping quantity, expressway traffic safety problems are increasingly prominent. According to statistics, in expressway traffic accidents, the accident rate of collision of vehicles and guardrails is higher than 30%, wherein the casualties and the vehicle damage caused by insufficient buffering performance of the guardrails are serious. At present, the highway concrete guardrail in the prior art mainly has the following technical problems: First, buffering performance is limited. Conventional concrete guardrails are generally of a fixed structure, i.e. the main body of the guardrail is fixed to the ground foundation by means of a rigid connection. When the vehicle impacts the guardrail at a higher speed, the concrete guardrail hardly deforms, and rigid collision is generated between the vehicle and the guardrail, so that huge impact force directly acts on the vehicle and drivers, and serious vehicle damage and personal injury are caused. While some prior art attempts have been made to provide rubber bumpers or spring dampening plates on the outside of the guard rail, these dampening structures provide limited elastic deformation and are not effective in absorbing the high energy impact of a high speed impact. Second, the buffering characteristics are single. The prior art bumper guard typically employs a single spring-damper structure, the damping force of which is related only to the compression displacement of the spring (i.e., following hooke's law, f=kx), regardless of the impact velocity. The displacement sensitive buffer structure has the inherent defects that the compression amount of the spring is small, the buffer force is small, and the guardrail can be normally reset during low-speed impact, but the maximum buffer force provided by the spring is still limited even if the spring is compressed to the limit position during high-speed impact, and the high-energy impact generated during high-speed impact cannot be dealt with. In other words, the prior art cannot realize "speed sensitive" buffering, i.e. the magnitude of the buffering force cannot be adaptively adjusted according to the impact speed. Third, there is a lack of a stepped energy absorption mechanism. In the prior art, although the concept of multistage buffering exists, the simple superposition of a plurality of springs is still elastic buffering, and the stepwise energy absorption of 'elastic buffering before damping buffering' cannot be realized. For example, if a flexible cushion can be provided by a spring at the initial stage of the crash and a strong cushion can be provided by a high damping medium at the later stage of the crash during the crash, the vehicle and the driver can be more effectively protected. Fourth, the buffer media selection is limited. In the prior art, air, hydraulic oil and the like are mostly adopted as buffer mediums for the buffer guardrails, the relation between the damping characteristics of the mediums and the speed is linear or approximately linear, and the damping effect which increases along with the speed in a nonlinear manner cannot be realized. In summary, there is a need in the art for an anti-collision structure capable of adaptively adjusting the buffering force according to the collision speed and realizing stepped energy absorption in the existing highway concrete guardrail. Disclosure of Invention The invention aims to solve the technical problems in the prior art and provides a drawer type anti-collision energy absorbing structure of a highway concrete guardrail, which can adaptively adjust buffering force according to the collision speed of a vehicle, and realize stepped energy absorption mainly of elastic buffering at low speed and damping buffering at high speed, thereby effectively protecting the safety of the vehicle and drivers and passengers. In order to achieve the above purpose, the present invention provides the following technical solutions: A drawer type anti-collision energy absorbing structure of a highway concrete guardrail comprises a guardrail main body, a buried pipe and a drawer type buffer component. The buried pipe is arranged below the guardrail main body and is used for being buried in the expressway subgrade. The drawer type buffer component is arranged in the buried pipe and is us