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桥台填土沉降加固处理

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发布时间:2013/5/6

塑料盲沟厂家介绍,桥台基础一般都作了加固处理(如采用扩大基础、桩基础等),沉降量很小。需待通车一段较长时间后才能趋于稳定。建成后的桥台沉降可视为零。而路堤填土因其固有的压缩徐变性质,即使经充分压实也难以避免因土基固结等因素造成的沉降,台后路堤的沉降量主要由天然地基沉降和填土沉降两部分组成。在路堤自重和车辆垂直荷载及冲击振动荷载作用下,路基填料逐渐被压缩,孔隙率降低,密实度逐渐增大,从而在一定期限内产生路堤填土沉降。
The plastic blind ditch manufacturers, abutment foundation are generally made by reinforcement (such as the foundation, pile foundation settlement is small, etc.). Need to be opened for a longer period of time in order to stabilize. After the completion of the abutment settlement can be regarded as zero. But due to the compression creep of embankment fill their inherent nature, even after full compaction is difficult to avoid the settlement caused by factors such as soil consolidation, settlement of embankment station is mainly composed of natural foundation settlement and the settlement of two parts. In the embankment weight and vehicle vertical load and shock load, subgrade filling is gradually compressed, the porosity, density increases, resulting in a certain period of embankment settlement.
在桥涵与路堤的连接部位,由于存在缝隙,雨水会沿缝隙渗透,下渗水对桥台一般不产生破坏作用,但对土类填料易产生浸蚀和软化,特别对填方体压实不够,易产生侵蚀和软化,降低强度,导致填方体变形。在外部车辆荷载冲击作用下,必然造成桥头路基沉陷。但对承受搭板一端的路堤部位未进行处理,让搭板一端直接置于一般土基上,从而在那里形成凹陷,以致搭板滑落。再则,设计对桥台与路堤相邻的沉降差考虑较多,而对桥头竣工后沉降引起的纵坡变化注意不够,造成桥头段纵坡不顺,在突变点往往形成台降,以致出现跳车现象。
The connection part of bridge and embankment, due to the existence of gap, rain along the cracks, seepage under the right abutment is generally not destructive effect, but easy to soften the soil erosion and packing, especially for Embankment Compaction is not enough, prone to erosion and softening, reduce the strength, caused the embankment deformation. In the external load of vehicle impact, will inevitably cause bridgehead roadbed subsidence. But under embankment site slab is not processed, make a plate is placed directly in the common soil, resulting in the formation of depression in there, so that the slab. Furthermore, the design of bridge abutment and embankment settlement of adjacent difference to consider more, and longitudinal slope caused by the change of the bridge after completion of settlement caused by insufficient attention, bridge section of longitudinal slope is not smooth, the mutation point often form table drop, resulting in the bump phenomenon.

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