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A semi-rigid composite beam anti-collision guardrail and its construction method

A technology of anti-collision guardrails and superimposed beams, applied in the directions of roads, road safety devices, roads, etc., can solve the problems of low service life, high maintenance cost, corrosion, etc., achieve high strength and durability, reduce maintenance times, The effect of improving safety performance

Active Publication Date: 2018-01-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steel beams and steel bars used in the corrugated beam steel guardrail are easily corroded by the environment outdoors, and the service life is not high. It needs to be painted with anti-rust paint every 3 years or so, and the maintenance cost is huge.
Moreover, once the corrugated beam steel guardrail breaks due to a collision, its sharp and high-rigidity section will be inserted into the vehicle body like a sharp sword, which is likely to cause serious personal injury to the occupants of the vehicle. Such accidents occur every year, and the frequency is relatively high. high

Method used

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  • A semi-rigid composite beam anti-collision guardrail and its construction method
  • A semi-rigid composite beam anti-collision guardrail and its construction method
  • A semi-rigid composite beam anti-collision guardrail and its construction method

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Experimental program
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Effect test

Embodiment 1

[0041] 1. Raw materials and mix ratio design:

[0042] The cementitious materials selected for the preparation of ecological nanoparticle-reinforced cement-based composites are P·II 52.5 Portland cement, Class I fly ash, and silica fume; the fine aggregate is continuous graded ordinary river with a maximum particle size of 2.36mm Sand; the steel fiber is ultra-fine steel fiber with a length of 13mm, an aspect ratio of 65, and a maximum tensile strength of 2850MPa; the solid percentage of high-performance water reducing agent is 40%, and the tax reduction rate is more than 40%. The ratio of raw materials is shown in Table 1.

[0043] Table 1. Mixing ratio of ecological nanoparticle-reinforced cement-based composites (kg / m 3 )

[0044]

[0045] (Note: SP refers to high-performance water reducer, the value in the table is the mass of active ingredients in the water reducer)

[0046] The cementitious materials selected for the preparation of ultra-high ductility cement-based...

Embodiment 2

[0062] 1. Raw materials and mix ratio design:

[0063] The cementitious materials selected for the preparation of ecological nanoparticle-reinforced cement-based composites are P·I 52.5 Portland cement, Class 1 fly ash, and silica fume; Sand; the steel fiber is ultra-fine steel fiber with a length of 13mm, an aspect ratio of 65, and a maximum tensile strength of 2850MPa; the solid percentage of the high-performance water reducer is 40%, and the water reducing rate is above 40%. The ratio of raw materials is shown in Table 3.

[0064] Table 3. Mixing ratio of ecological nanoparticles reinforced cement-based composites (kg / m 3 )

[0065]

[0066] (Note: SP refers to high-performance water reducer, the value in the table is the mass of active ingredients contained in the water reducer)

[0067] The cementitious materials selected for the preparation of ultra-high ductility cement-based composite materials are P II 42.5 Portland cement; Class I fly ash; S95 class granulated ...

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Abstract

The invention discloses a semi-rigid composite beam anti-collision barrier and a construction method thereof. The semi-rigid composite beam anti-collision barrier comprises a main body made of ecological nano-particle reinforced cement-based composite material and an ultra-high ductility cement-based composite material. The prepared protective layer is formed by composite pouring of the main body and the protective layer through a construction method. The main body accounts for 2 / 3-3 / 4 of the cross-sectional height of the composite beam anti-collision barrier, and the protective layer accounts for 1 / 4-1 / 3 of the cross-sectional height of the composite beam anti-collision barrier. The semi-rigid composite beam anti-collision guardrail of the present invention has extremely high strength and durability, can better exert the safety function of the anti-collision guardrail, reduce the maintenance times of the anti-collision guardrail, and prolong the service life. Small cracks will produce a self-healing effect after the load disappears, which greatly improves the service life of the semi-rigid composite beam crash barrier.

Description

technical field [0001] The invention relates to a semi-rigid composite beam anti-collision barrier, which belongs to the technical field of concrete anti-collision barriers. Background technique [0002] With the rapid development of my country's highways, especially expressways, the crash barriers, as an effective facility to ensure road safety, play a vital role. As a kind of rigid guardrail, the ordinary concrete anti-collision barrier has the advantages of good interception effect and small impact damage. However, when a vehicle collides with an accident, the concrete guardrail must rely on the collision to absorb energy, and there are fewer considerations for the safety of the crew in the vehicle. If the vehicle stops after colliding with the guardrail, the huge deceleration will easily cause internal injuries such as the cervical spine of the vehicle occupants; if the vehicle collides If you cannot stop behind the guardrail, it will easily cause the vehicle to change ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01F15/08
Inventor 郭丽萍马瑞谌正凯陈波
Owner SOUTHEAST UNIV
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