Is the grade B wave beam guardrail only installed at the corner?
Installation of round column. According to the "rules" of traffic safety facilities of highway JTG/T specified in the D81-2006 set in the soil B in grade two wave beam guardrail post embedded depth should be less than 125cm; set in the soil base class A, Am grade two wave beam guardrail post embedded depth should be less than 140cm; set in stonework, underground a pipeline section concrete foundation in the guardrail, post embedded depth shall not be less than 40cm. But in the actual construction, the shoulder and the central zone of the lower the complexity of the situation, such as gravel (such as large area construction, etc.) often appear in the soil column hit deep enough, in some places the 1/3 sections of the column do not go to fight for as cast high cost construction method, construction teams often use night cutting method reduce the column depth for illegal operation,. After cutting the column installed guardrail, it can not reach the collision requirements, and can not guarantee the driving safety of the highway. Owners, supervisors and contractors should resolutely put an end to this phenomenon. Found a strict together, without leaving future trouble. As long as the owner, the supervisor and the contractor pay more attention to the construction site, the problem is easy to solve.
High-strength splicing bolt problem. As we all know, the mechanical performance grade of high strength splicing bolts should be 8.8 of GB/T1591, and the tensile load shall be no less than 133kN. On the face of it, it is only the connecting part of guardrail, block and round column. In fact, it is the key to the whole security system, collision system, that is, the heart and the weak part. However, when installed, some irresponsible construction personnel, in the adjustment line after not high strength bolt splicing, this situation is still very serious in some sections, the highway guardrail exists serious security hidden danger.
Loss of round column. Some sections of the soil soft, no compaction, into the round column is easy to lose. What's more, a bid section loses more than 1000 round columns. Even if these round columns are not missing. Can you meet the requirements of collision avoidance? The problem of lost column is actually the quality of construction.
