Combined Freezing Reinforcement Method for Undrained Excavation of Large Foundation Pit
A combined, foundation pit technology, used in excavation, infrastructure engineering, construction, etc., can solve problems such as the inability to effectively isolate water at the bottom, improve safety and economic rationality, reduce cost and construction period, and reduce engineering costs. Effect
Active Publication Date: 2021-12-21
SHIJIAZHUANG TIEDAO UNIV
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Problems solved by technology
[0003] The purpose of the present invention is to provide a large foundation pit undrained excavation combined freezing reinforcement method, aiming to solve the problem in the prior art that the bottom of the foundation pit cannot be effectively isolated from water when the foundation pit is constructed on the permeable ground
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[0027] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] A combined freezing reinforcement method for undrained excavation of a large foundation pit, comprising the following steps:
[0029] S1: Construction preparation and temporary shaft position determination: According to the shape of the foundation pit and the layout of the underground diaphragm wall 2, determine the position and quantity of the temporary shaft 1 in the foundation pit. The section of the temporary shaft 1 is rectangular or circula...
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The invention discloses a combined freezing reinforcement method for undrained excavation of a large-scale foundation pit, which belongs to the technical field of foundation pit construction and comprises the following steps: construction of a temporary shaft and an underground diaphragm wall, construction of a freezing pipe and detection, freezing of a horizontal bottom sealing frozen wall, and freezing of the frozen wall Excavation of excavation and pouring of structure - stop freezing, demolish remaining temporary shaft and complete pouring of pit floor. The present invention constructs a working space for frozen construction by constructing a temporary shaft, uses a freezing method to seal the bottom of the foundation pit, and artificially constructs a water-proof stratum at the bottom to realize non-drainage excavation of the foundation pit. The invention solves the problem that the bottom of the foundation pit cannot be effectively impervious to water when the foundation pit is constructed in the permeable stratum. The foundation pit reinforcement method combining the traditional cement-based underground diaphragm wall with the artificial freezing method greatly reduces the cost and construction period of foundation pit reinforcement, and improves the safety of the project. The invention is suitable for undrained excavation of foundation pits in complex permeable strata, can effectively reduce the impact of foundation pit construction on the surrounding environment and reduce the waste of water resources.
Description
technical field [0001] The invention belongs to the technical field of foundation pit construction, in particular to a combined freezing reinforcement method for undrained excavation of large foundation pits. Background technique [0002] At present, most of the various foundation pit projects are constructed by means of underground diaphragm walls combined with stratum dewatering. However, in the northern region, there is a common problem of water resource shortage, and the restrictions on groundwater pumping and drainage are becoming more and more stringent. Therefore, large-scale, long-term dewatering is used for construction. Will face more and more environmental protection and ecological pressure. In addition, in some water-rich strata in the south, the groundwater content is sufficient, the water pressure is high, and some strata are even connected with rivers, so it is difficult to excavate large-scale foundation pits in ordinary precipitation construction. Therefore...
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IPC IPC(8): E02D3/115E02D17/02E02D17/04
CPCE02D3/115E02D17/02E02D17/04
Inventor 岳祖润张松胡田飞孙铁成介少龙亓源水张鸿成毛帅张家荣
Owner SHIJIAZHUANG TIEDAO UNIV