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Construction Method of Deep Foundation Pit Freezing Bottom Sealing

A construction method and technology of deep foundation pits, which can be used in infrastructure engineering, excavation, construction, etc., can solve problems such as large buried depths, and achieve the effects of shortening the construction period, reducing construction difficulty and risks

Inactive Publication Date: 2018-03-20
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is a construction method proposed to solve the problem that the underground diaphragm wall and other enclosure structures are too deep into the soil during the excavation process of the deep foundation pit.

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  • Construction Method of Deep Foundation Pit Freezing Bottom Sealing
  • Construction Method of Deep Foundation Pit Freezing Bottom Sealing
  • Construction Method of Deep Foundation Pit Freezing Bottom Sealing

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Embodiment Construction

[0033] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and are only examples.

[0034] Referring to the accompanying drawings, the implementation method of deep foundation pit freezing bottom sealing excavation construction method includes the following steps:

[0035] Step 1: Construction of underground diaphragm wall 1. The underground diaphragm wall has the function of retaining soil and waterproofing. During construction, it is necessary to ensure that the verticality of the wall meets the requirements, and the joints between two adjacent walls must have a good water sealing effect; the underground diaphragm wall must be constructed to a specified depth. Embedded to a certain depth in the designed frozen soil body bottom plate 2, but the depth cannot exceed the bottom of 2.

[0036] Step 2: Freeze pipe 3 construction. During the d...

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Abstract

The invention discloses a freezing bottom-sealing construction method for a deep foundation pit, and relates to a construction method for a foundation pit bracing structure. The freezing bottom-sealing construction method is characterized by comprising the following steps: (1) constructing underground diaphragm walls; (2) drilling and laying freezing pipes; (3) performing stratified excavation, and meanwhile, commencing the freezing of a foundation pit baseplate within the design time; (4) after the bottom of the foundation pit is excavated, pouring the foundation pit baseplate, namely a concrete baseplate; and (5) cutting off the freezing pipes exposed in the foundation pit. The freezing bottom-sealing construction method provided by the invention has the advantages that under the premise that the construction safety is guaranteed, the underground diaphragm wall buried depth can be greatly shortened, and the underground diaphragm wall construction difficulty and the construction risk can be reduced.

Description

technical field [0001] The invention relates to a construction method for deep foundation pit and shaft excavation, which is applicable to various complex geological conditions. Background technique [0002] At present, most excavations of deep and large foundation pits use underground diaphragm walls as the enclosure structure. The soil penetration ratio of the underground diaphragm walls is 0.7-1.0 according to the actual situation. When the excavation depth of the foundation pit is less than 50m, the depth of the underground diaphragm wall is within 100m. , the current level of technology can be realized; when the excavation depth of the foundation pit reaches 100m, the depth of the ground connection wall can reach 200m. The deepest underground diaphragm wall currently under construction in the world is the 158m-deep concrete cut-off wall project of the dam foundation of Pangduo Water Conservancy Project in Tibet. Various problems have been encountered during the construc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04E02D19/14
CPCE02D17/04E02D19/14
Inventor 岳丰田张晋勋纪玉田张勇石荣剑陆路吴昊闻思齐
Owner CHINA UNIV OF MINING & TECH
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