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Construction method of deep foundation pit under complex geological conditions

A technology with complex geological conditions and construction methods, applied in the construction field of excavating deep foundation pits, can solve problems such as insecurity

Active Publication Date: 2022-07-29
PANGANG GRP ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a deep foundation pit construction method under complex geological conditions, which solves the problem that the existing foundation pit support method is not safe for construction under complex geological conditions

Method used

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  • Construction method of deep foundation pit under complex geological conditions

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] A new accident pond is located at the exit of the 4# tunnel and next to the tailings pipe WK18. The excavation length of the accident pond is 39m and the width is 21.5m. The accident pool does not have the conditions for grading and excavation, so it is excavated vertically. All boreholes in the accident pool area of ​​the proposed site see groundwater, and the groundwater level is 0-0.97m. The surface layer is backfill, with a thickness of 3.5m, yellow-brown, loose, sandy soil, containing breccia and boulders. The middle layer is silty clay, with a thickness of 7.7m, gray-brown, plastic to soft plastic, with a fishy smell and a small amount of fragments in some parts. The lower layer is moderately weathered rock, specifically (strong) moderately weathered granite, with a thickness of 5.27m. The main mineral components are feldspar, quartz and a small amount o...

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Abstract

The invention discloses a deep foundation pit construction method under complex geological conditions, relates to the technical field of building construction, and solves the problem that the existing foundation pit support method is unsafe for construction in complex geological conditions. The technical scheme adopted in the present invention is as follows: when the surface layer is backfill soil, the middle layer is silty clay, the lower layer is medium weathered rock, and the vertical excavation construction of the deep foundation pit under the geological conditions of high water level, the deep foundation pit is excavated first. Drainage ditches shall be excavated around the area to discharge surface water; then a single row of steel pipe piles shall be constructed along the excavation boundary of the deep foundation pit, and the parts of the steel pipe piles exposed to the ground shall be connected by cross bars; In addition, construct the anchorage or select other fixed objects as the anchoring point, and tighten the crossbar and the anchoring point; then dewater the deep foundation pit excavation area, and excavate the deep foundation pit in layers, install waist beams, Construction of anchor pipes and construction of concrete retaining walls; finally, repeated layered excavation and support until the maximum design excavation depth is reached.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for excavating deep foundation pits under complex geological conditions. Background technique [0002] At present, most of the deep foundation pit constructions use methods such as grading and excavation, anchor mesh and shotcrete support. When deep foundation pits are rich in groundwater and complex geological conditions, conventional methods cannot meet the safety of excavation equipment and personnel. [0003] The patent with the publication number of CN 111705809 A discloses a deep foundation pit construction structure and a deep foundation pit construction method, wherein the deep foundation pit construction structure includes a retaining wall established on the side wall of the foundation pit and surrounded by uprights, and the lower end of the uprights It is inserted under the bottom surface of the foundation pit, the ground outside the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/02E02D17/04E02D5/76
CPCE02D17/02E02D17/04E02D5/76E02D2300/0029E02D2600/20E02D2600/30
Inventor 郑绍元李绍贵宋建川
Owner PANGANG GRP ENG TECH
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