Integrated six-stage three-cross-beam metal beam column type guardrail for median strip of expressway

Abstract

The invention discloses an integrated six-stage three-cross-beam metal beam column type guardrail for a median strip of an expressway. The integrated six-stage three-cross-beam metal beam column typeguardrail comprises a concrete surface layer, stand columns, cross beams, cross beam longitudinal supporting assemblies and cross beam transverse connection reinforcing assemblies. The concrete surface layer is arranged on an expressway median strip; the lower ends of the stand columns are arranged in the concrete surface layer and extend to the ground layer; three cross beams are sequentially arranged on the two sides, facing the two driving directions of the expressway, of the stand columns from top to bottom; each cross beam is connected with the stand column through the cross beam longitudinal supporting assembly in a longitudinal direction, and each cross beam is connected and extended through the cross beam transverse connection reinforcing assembly in a transverse direction. The requirements for guardrail strength and deformation control, snow blocking prevention and material consumption control are met at the same time; the guardrail has the advantages that accident vehicles can be stopped, a good guiding function is achieved, the vehicles can be guided out smoothly, safety of passengers in the vehicles can be guaranteed, serious damage or life endangering caused by overlarge deceleration and acceleration is avoided, and the protection level of the guardrail reaches six levels.

Description

technical field [0001] The invention belongs to the technical field of the expressway central divider, and in particular relates to an integral six-level three-beam metal beam-column guardrail for the expressway central divider. Background technique [0002] The guardrail of the central divider is a guardrail installed in the central divider of the highway. It is used to physically separate the opposite traffic flow on high-grade highways, and prevents out-of-control vehicles from crossing the divider into the opposite lane and causing secondary damage. The safety performance of the guardrail is important for improving Highway driving safety, reducing the severity of accidents, reducing the degree of injury to occupants, reducing vehicle property losses, and improving the level of road traffic safety play an important role. The setting of the central divider guardrail in this project involves two aspects. One is the selection of the protection level of the central divider gu...

AI Technical Summary

Problems solved by technology

However, most of the concrete guardrails are solid walls, and the structure of the guardrails is not transparent, which will easily cause the driver and passengers to feel depressed during the driving process; at the same time, the concrete guardrails are easy to block snow, which is not conducive to the blowing and discharge of snow on the expressway. In the Qinghai-Tibet Plateau area, there are problems such as road icing due to snow blocking, poor resistance to salt corrosion of concrete guardrails, and difficulty in daily maintenance and post-collision repairs.

[0006] Corrugated beam steel guardrails are superior to concrete guardrails in terms of cushioning performance, snow resistance and corrosion resistance, but due to their low stiffness, the maximum lateral dynamic deformation of the guardrails during vehicle collisions is relatively large. Therefore, the central divider with guardrails The width requirement is relatively high. Except for the three-level (Am level) combined wave-beam guardrail, other grades of wave-beam guardrails recommended in the current design rules are not suitable for the road section with a width of 2m in the central divider of the expressway, but for this project As far as the current design specification is concerned, under the conditions of the design speed of 120km / h and the width of the median strip of 2m, the protection level of the integral guardrail needs to reach level six (SS level). Therefore, the recommended form in the current design rules not applicable to this project

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