桥头引道设计要点及桥头跳车量化指标探讨

The Main Points of Bridge Approach Road Design and the Quantification Indicator of Bump at Bridge-Head

剖析了桥头跳车的发生机理,总结了桥头引道设计中存在的问题,从桥头原地基处理方案、处理长度、路堤防护、台背回填、桥头搭板长度及厚度参数的选取、搭板头接茬处详细设计等方面进行设计总结,探讨了桥头跳车量化判断的目标值,从桥头变化值和容许最大台阶高度,提出量化桥头跳车判别指标,拟作为桥头引道设计的容许纵坡和台阶高度的控制性指标,虽然建设成本略增加,但能根治桥头跳车现象。

This article analyzes the mechanism of vehicle jumping at the bridge head, summarizes the problems in the design of the bridge head approach, and summarizes the design from the aspects of the original foundation treatment plan, treatment length, embankment protection,backfilling of the abutment back, selection of parameters for the length and thickness of the bridge head approach slab, and detailed design of the joint of the approach slab. It explores the target values for quantitative judgment of vehicle jumping at the bridge head, including the variation value of the bridge head and the allowable maximum step height, Propose a quantitative indicator for identifying vehicle jumping at the bridge head, which is intended to serve as a control indicator for the allowable longitudinal slope and step height in the design of the bridge head approach. Although the construction cost may slightly increase, it can eradicate the phenomenon of vehicle jumping at the bridge head.