液态粉煤灰台背回填施工技术在京新高速公路的应用
液态粉煤灰台背回填施工技术在京新高速公路的应用
摘要:京新高速L8合同段洋河3号特大桥台背回填采用液态粉煤灰施工技术，造价低、工期
短、效果好。本文分析了产生桥头跳车的原因,着重介绍了液态粉煤灰台背回填的施工技术及效果。
关键词:桥头跳车;液态粉煤灰;台背回填
Performance of Abutment Backfill Technology of Liquid Cinder in Beijing-Xinjiang High Way Construction
TU Jun-Zhu1
(1. No.4 Engineering Corporation Limited of China Railway 14th Bureau Group)
Abstract: Abutment backfill technology of liquid cinder was applied on The Yanghe River No. 3 Super Large Bridge construction performance, which was part of the L8 contract section in Beijing-Xinjiang high way. This technology was low costing, high efficient and worked fine. The present paper discussed construction technology of liquid fly ash backfill and its performance. In addition, the causes of vehicle jumping at bridgehead was also analyzed
Key words: jumping at bridge-head; liquid cinder; abutment backfill technology
公路工程施工中的质量通病之一是桥头跳车，2009年河北省交通厅质量年活动方案主要控制目标就是解决桥头跳车的问题，其产生的原因诸多，台背回填原材料选用质量差；施工不规范；施工压实度达不到设计要求等等引起台背回填土体自身沉降过大，从而桥台与路基高差过大，给行车和公路养护造成很大困难，也容易发生行车事故。
1. 桥头跳车的原因
桥头跳车作为行车安全的较大隐患之一，主要原因在于台背回填填料不合格及施工质量不合格导致。当然地基地面条件、设计要求等方面的诸多影响因素也直接导致桥头跳车问题的发生。
1.1 桥台与路基沉降不均匀造成桥头跳车现象
桥台与路堤之间沉降量的差异产生了高差造成车辆行车过程中路桥过渡段不顺接，车辆暂时性失控，行车舒适性大大降低。桥台的沉降只随地基的沉降而产生,沉降量很小，而桥头路基的沉降主要有路基沉降和地基沉降两部分。桥头