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Sand gushing prevention construction method for large open caisson construction in quicksand stratum
The invention discloses a sand gushing prevention construction method for large open caisson construction in quicksand stratum.The sand gushing prevention construction method comprises the following steps that S1, surveying and paying off are conducted with the center of a shaft as the circle center, a steel sheet pile guide line is marked, and then a steel sheet pile is driven according to the guide line; s2, a foundation pit construction sand cushion layer and an open caisson blade foot are excavated downwards according to a design drawing flat field, and an extension shaft, a partition wall and a cross beam are sequentially constructed; s3, in the sinking process, the position where quicksand soil between the steel sheet pile and the shaft is liquefied into a virtual pit is backfilled and tamped with coarse materials such as gravels, and the position, 2 m above the designed elevation, of the blade foot is sunken; and S4, the quicksand stratum below the circle of the blade foot is completely reinforced through a grouting method, the blade foot sinks to the designed elevation, bottom sealing is conducted, and open caisson bottom plate concrete is poured. A non-drainage construction method is adopted to increase the pressure of bottom quicksand soil, meanwhile, the buoyancy of the well is increased, it is guaranteed that sand cannot burst out of the bottom of the open caisson in the construction process, the quicksand soil at the bottom of the blade foot is grouted and reinforced, and it is guaranteed that settlement observation meets the requirement.
本发明公开了一种流沙地层大型沉井施工用防涌沙施工方法，包括以下步骤：S1、先以井筒中心为圆心测量放线，标出钢板桩导向线，然后依照导向线打入钢板桩；S2、按设计图纸平整场地向下开挖一段基坑施工沙垫层，沉井刃脚，依次施工接长井筒、隔墙以及横梁；S3、下沉过程中将钢板桩与井筒间流沙土液化成虚坑的位置用碎石等粗糙材料回填并夯实，下沉至刃脚于设计标高上2m处位置；S4、通过注浆法将刃脚一圈下方流沙地层全部加固，下沉至设计标高，封底，浇筑沉井底板混凝土。本发明采用不排水施工法对底部流沙土增大压力，同时增加井的浮力，保证施工过程中沉井底部不会涌沙，将刃脚底部流沙土注浆加固，保证沉降沉降观测符合要求。
Sand gushing prevention construction method for large open caisson construction in quicksand stratum
The invention discloses a sand gushing prevention construction method for large open caisson construction in quicksand stratum.The sand gushing prevention construction method comprises the following steps that S1, surveying and paying off are conducted with the center of a shaft as the circle center, a steel sheet pile guide line is marked, and then a steel sheet pile is driven according to the guide line; s2, a foundation pit construction sand cushion layer and an open caisson blade foot are excavated downwards according to a design drawing flat field, and an extension shaft, a partition wall and a cross beam are sequentially constructed; s3, in the sinking process, the position where quicksand soil between the steel sheet pile and the shaft is liquefied into a virtual pit is backfilled and tamped with coarse materials such as gravels, and the position, 2 m above the designed elevation, of the blade foot is sunken; and S4, the quicksand stratum below the circle of the blade foot is completely reinforced through a grouting method, the blade foot sinks to the designed elevation, bottom sealing is conducted, and open caisson bottom plate concrete is poured. A non-drainage construction method is adopted to increase the pressure of bottom quicksand soil, meanwhile, the buoyancy of the well is increased, it is guaranteed that sand cannot burst out of the bottom of the open caisson in the construction process, the quicksand soil at the bottom of the blade foot is grouted and reinforced, and it is guaranteed that settlement observation meets the requirement.
本发明公开了一种流沙地层大型沉井施工用防涌沙施工方法，包括以下步骤：S1、先以井筒中心为圆心测量放线，标出钢板桩导向线，然后依照导向线打入钢板桩；S2、按设计图纸平整场地向下开挖一段基坑施工沙垫层，沉井刃脚，依次施工接长井筒、隔墙以及横梁；S3、下沉过程中将钢板桩与井筒间流沙土液化成虚坑的位置用碎石等粗糙材料回填并夯实，下沉至刃脚于设计标高上2m处位置；S4、通过注浆法将刃脚一圈下方流沙地层全部加固，下沉至设计标高，封底，浇筑沉井底板混凝土。本发明采用不排水施工法对底部流沙土增大压力，同时增加井的浮力，保证施工过程中沉井底部不会涌沙，将刃脚底部流沙土注浆加固，保证沉降沉降观测符合要求。
Sand gushing prevention construction method for large open caisson construction in quicksand stratum
一种流沙地层大型沉井施工用防涌沙施工方法
TAO YANG (author) / DING JIANHUA (author) / LIU BAOTANG (author)
2023-09-01
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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