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高速公路扩建工程桥涵基础,特别是扩大基础施工时,需开挖旧桥涵的锥坡及相应的路基,容易引起锥坡和路基塌方,从而影响路基的稳定。根据现场实际情况,提出了4种防护措施,即:钢板桩组合锚杆防护方案;双级钢板桩防护方案;土钉支护方案;桩基础防护方案。通过比选,最后采用桩基础方案,彻底消除了旧路基安全隐患,实践证明效果较好。
When expanding the foundation construction, it is necessary to excavate the conic slope of the old bridges and culverts and the corresponding subgrade so as to easily cause the slope slope and subgrade collapse, thus affecting the stability of subgrade. According to the actual situation in the field, four kinds of protection measures are proposed, namely: the combination of steel sheet pile anchor protection program; two-level steel sheet pile protection program; soil nailing program; Through the comparison and selection, the final pile foundation program to completely eliminate the hidden dangers of the old subgrade, the practice proved effective.