Crashproof guard bar

An anti-collision guardrail and guardrail technology, applied in bridge parts, roads, bridges and other directions, can solve the problems of vehicle rollover, reduction of the effective height of guardrails, large windward area, etc., and achieve the effect of good guiding ability

Inactive Publication Date: 2005-06-29
雷正保
0 Cites 10 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] However, after the existing semi-rigid guardrail is hit by a car, it always absorbs the impact kinetic energy of the car through the deformation of the guardrail beam and the column, and the deformation of the column is always a bending deformation around the root of the column, that is, after the impact. The column is always in a tilted state, which leads to the continuous decrease of the effective height of the guardrail during the collision process, which easily induces the vehicle to roll over. At the same time, the deformation of the guardrail is too large, which is not conducive to guiding the out-of-control vehicle back to the correct driving track
[0004] For this reason, people have to use a large number of concrete guardrails (ie rigid guardrails) on particularly dangerous road sections such as highways on cliffs and bridges. The track has the advantage of strong guiding ability, but the concrete guardrail is not easy to carry, and is not suitable for the production mode of large-scale production in enterprises, and because it cannot absorb the impact kinetic...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Method used

As shown in Figure 1, the cross-sectional shape of the beam 3 of the present embodiment is a rectangle, is arranged on the front of the column 2, and links to each other with the column 2; The cross-sectional shape of the beam 3 can also be circular, trapezoidal, wave or other form. In the present invention, the column 2 of the anti-collision guardrail is installed in the guide groove 12 provided by the foundation beam 11, and is connected with the energy-absorbing threaded part 4, so that it becomes movable, that is, it can move backward for a section when being impacted and collided. distance. First, the car collides with the beam 3 to deform it, and transmits the force to the column 2. The column 2 slides in the guide groove 12 of the F-shaped guardrail foundation 1 to generate a lateral displacement, which drives the impact guide rod 42 to impact and shear the energy-absorbing casing. The internal thread 411 inside 41 makes it shear and deform, and absorbs energy to achieve the effect of receding and buffering the column 2, and ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

An anti-collision guardrail, comprising a guardrail foundation (1), a column (2), a beam (3) and an energy-absorbing threaded part (4), the guardrail foundation (1) is F-shaped, placed horizontally in the roadbed, and the guardrail foundation (1 ) on the foundation beam (11) on the rear section to open a guide groove (12), in the foundation beam (11) at the front end of the guide groove (12), a hole (13) is provided along the longitudinal direction, and a hole (13) is set in the hole (13). The energy-absorbing threaded part (4), the column (2) is arranged in the guide groove (12) and connected with the energy-absorbing threaded part (4), the beam (3) is arranged in front of the column (2) and connected with the column (2) . The invention has the characteristics of firm foundation, no encroachment on the effective driving road surface, buffering and energy absorbing effect when the vehicle collides with the guardrail, reduced collision intensity and good guiding ability, and can minimize the damage to the vehicle and passengers caused by the collision. It is especially suitable for highway anti-collision barriers and bridge anti-collision barriers on cliffs.

Application Domain

Technology Topic

Energy absorbingEnergy absorbers +2

Image

  • Crashproof guard bar
  • Crashproof guard bar
  • Crashproof guard bar

Examples

  • Experimental program(1)

Example Embodiment

[0024] According to the momentum theorem, if a particle's speed changes sharply in a very short period of time, but its position remains almost unchanged, the particle will suffer a collision. Assuming that during the collision, the mass of the objects involved in the collision does not change, and the time interval Δt is integrated by Newton's law, the change in momentum is equal to the impulse, namely:
[0025] I′=mv s ′ Momentum of the particle after collision
[0026] I=mv s Momentum of the particle before collision
[0027] P = ∫ t t ′ Fdt Impulse of mass point
[0028] I′-I=P
[0029] In the entire collision process, F is a variable and a function of time, but it can be approximately regarded as a constant value in each time interval Δt, then:
[0030] mv n -mv n-1 = F n Δt n=1, 2, 3Λ
[0031] Another way to reduce the collision force is to extend the collision time, that is, the total collision time.
[0032] Based on the above principles, such as figure 1 As shown, the anti-collision guardrail of the present invention includes a concrete guardrail foundation 1, a column 2, a beam 3, and an energy-absorbing threaded component 4. The guardrail foundation 1 is F-shaped and is placed horizontally in the roadbed, so that the foundation is firm and effective. Driving on the road; Figure 5 The structure of the guardrail foundation 1 is shown. The rear section of the guardrail foundation beam 11 on the guardrail foundation 1 is provided with a guide groove 12, and a hole 13 is formed in the guardrail foundation beam 11 at the front end of the guide groove 12 along the longitudinal direction.
[0033] From figure 2 , 3 4 It can be seen that an energy-absorbing threaded part 4 is arranged in the hole 13 on the guardrail foundation 1. The energy-absorbing threaded part 4 includes an energy-absorbing threaded sleeve 41 and an impact guide 42. The energy-absorbing threaded sleeve 41 is embedded in the foundation beam of the guardrail. 11 is provided in the hole 13 and positioned by the fixing pin 5 at one end of the energy-absorbing threaded sleeve 41. Such as image 3 , 6 As shown, one end of the inner hole of the energy-absorbing threaded sleeve 41 is provided with a trapezoidal internal thread 411, which may also be a triangular thread, a rectangular thread, a sawtooth thread or a circular thread. The other end of the energy absorbing threaded sleeve 41 is a light hole 412, and the impact guide rod 42 is sleeved in the energy absorbing threaded sleeve 41. Such as Figure 7 As shown, one end of the impact guide rod 42 is provided with a boss 421. The boss 421 is located in the light hole 412 of the energy-absorbing threaded sleeve 41, and its diameter can be equal to or smaller than the major diameter of the internal thread 411 and greater than the minor diameter of the internal thread 411 This embodiment is the same as the major diameter of the internal thread 411; in the event of a collision, the column 2 drives the impact guide rod 42 to impact and shear the internal thread 411 in the energy-absorbing sleeve 41 through the boss 421, causing it to shear Cut deformation to achieve the effect of absorbing energy and buffering. The other end of the impact guide rod 42 is provided with an external thread 422. The column 2 is arranged in the guide groove 12 and is installed on the impact guide rod 42 through a hole opened at the lower end thereof, and is fastened by a nut 6 screwed with the external thread 422.
[0034] Such as figure 1 As shown, the cross-sectional shape of the beam 3 in this embodiment is rectangular, which is arranged in front of the column 2 and is connected to the column 2; the cross-sectional shape of the beam 3 can also be circular, trapezoidal, wavy or other forms. In the present invention, the column 2 of the anti-collision guardrail is installed in the guide groove 12 of the foundation beam 11 and connected with the energy-absorbing threaded part 4 to make it a movable type, that is, it can move backward with the impact when it is impacted. distance. First, the car collides with the beam 3 to deform it, and transmits the force to the column 2. The column 2 slides in the guide groove 12 of the F-shaped guardrail foundation 1 to produce a lateral displacement, which drives the impact guide 42 to impact and shear the energy-absorbing casing. The internal thread 411 inside 41 causes it to shear deformation, absorb energy to achieve the effect of the column 2 retreating and buffering, and the column 2 can consume a certain amount of kinetic energy when it slides in the guide groove 12 by friction force. The load-carrying capacity is basically a constant, so the force that the guardrail exerts on the car during a collision is basically a constant. Since the upright column 2 moves in the guiding groove 12, the guiding ability is better than other types of guardrails. The present invention can adjust the geometrical size and pitch of the threaded section according to the actual conditions of different road sections, and further ensure that the collision mechanics characteristics of the automobile are close to the ideal collision curve. The energy-absorbing threaded component 4 shears energy, and the beam 3 and the column 2 plastic deformation absorb The combined effect of energy can extend the collision time, reduce the collision force between the car and the guardrail, and fully protect the safety of the occupants and the car. According to finite element dynamic numerical simulation experiments and theoretical calculations, the safety of cars and occupants can be protected.
[0035] The invention is a semi-rigid guardrail suitable for special-risk areas, and is particularly suitable for highway anti-collision guardrails and bridge anti-collision guardrails on cliffs.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

P-type bismuth telluride-based alloy material and preparation method thereof

ActiveCN113161474AGood orientationEfficient preparationThermoelectric device manufacture/treatmentThermoelectric device junction materialsBismuth tellurideZone melting
Owner:XIANDAO THIN FILM MATERIALS GUANGDONG CO LTD

Nano carbon tube cluster power and preparation

InactiveCN101412509AGood orientationUniform diameterQuartzNitric acid
Owner:HANGZHOU DIANZI UNIV

Classification and recommendation of technical efficacy words

Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products