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杭州绕城高速公路南线软基路段桥台台后软基处理均采用现浇薄壁筒桩施工,处理宽度为35m～50m,单桩长9m～22m,桩径为1m,壁厚0.12m,混凝土强度为C20.接邻桥台桩间距3m,过渡段桩间距3.5m,筒桩距桥台3m,梅花型布置,桩顶设盖板。经现场开挖和动测试验观测,桩身质量完好。全线路基沉降已通过验收合格,采用薄壁筒桩施工具有单桩承载力高、桩身质量可靠、施工进度快、沉降易稳定、预压期短,可快速填筑至等载,无须二次开挖和桥台预压等特点。现将薄壁筒桩施工工艺简单介绍如下。
The soft foundation of Hangzhou Expressway on the south section of bridge abutment and abutment soft foundation treatment are used cast-in-situ thin-walled tubular pile construction, processing width of 35m ~ 50m, single pile length 9m ~ 22m, pile diameter of 1m, wall thickness 0.12m , The concrete strength of C20. Adjacent abutment pile spacing 3m, the transition section spacing of 3.5m, the pile from the abutment 3m, plum-style layout, pile top cover. After field excavation and dynamic test observation, pile body quality intact. The whole subgrade settlement has passed the inspection and acceptance, the use of thin-walled tubular pile construction has a single pile high bearing capacity, pile quality and reliable, fast construction progress, settlement is easy to stabilize, preloading period is short, Excavation and abutment preloading characteristics. Now thin-walled pile construction process is as follows.