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Construction method for digging deep foundation pit in large-thickness highly weathered sandstone stratum in combined supporting mode

A technology of combined support and construction methods, applied in excavation, infrastructure engineering, construction, etc., can solve problems such as poor performance, prone to crack water and latent corrosion, and difficult to operate technical effects, so as to prevent softening and ensure construction quality and economy, the effect of strengthening the rigidity

Active Publication Date: 2015-12-16
GANSU SIXTH CONSTR GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for the existing technology that is prone to fissure water and latent erosion in the process of excavating a deep foundation pit in a strongly weathered sandstone layer, which makes it difficult to operate or the effect of the support technology is not good. Construction method of excavating deep foundation pit in large thickness and strong weathered sandstone layer with combined support of anchor rod and high-pressure rotary grouting pile

Method used

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  • Construction method for digging deep foundation pit in large-thickness highly weathered sandstone stratum in combined supporting mode
  • Construction method for digging deep foundation pit in large-thickness highly weathered sandstone stratum in combined supporting mode
  • Construction method for digging deep foundation pit in large-thickness highly weathered sandstone stratum in combined supporting mode

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Embodiment

[0053] The Jiugang Building 1# comprehensive building project undertaken by Gansu Sixth Construction Group Co., Ltd. is located in Chengguan District, Lanzhou City. The excavation depth of the foundation pit is 17.5 meters, with 27 floors above the ground and 3 floors underground. It has a frame-shear structure and a reinforced concrete slab type Raft foundation, the foundation bearing layer is sandstone layer. The exposed thickness of strongly weathered red sandstone in this project is uneven, the thickness is between 6-12m, and the strength is 400KPa, and the fissure water in the sandstone layer is abundant, without pressure, and the flow velocity is fast and the distribution is irregular. After exposure, the sandstone weathers quickly and the slope The softening corrosion phenomenon is very serious.

[0054] 1. Process principle

[0055] In order to ensure the construction quality of the rotary grouting piles and consider the economy, the support of the thick and strongly ...

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Abstract

The invention provides a construction method for digging a deep foundation pit in a large-thickness highly weathered sandstone stratum in a combined supporting mode, and relates to the technical field of complex geology deep foundation pit supporting construction in constructional engineering. According to the construction method, highly weathered sandstone stratum supporting is divided into two parts, the upper part of the sandstone stratum adopts a hollow anchor bolt shotcrete and rock bolt supporting mode, and a high-pressure jet grouting pile supporting mode is adopted 3 meters above a base. By means of the construction method, the problems in excavation, water sealing-up and supporting under the complex geology conditions that the highly weathered sandstone is not exposed evenly and large in thickness, and fissure water is not distributed evenly are solved effectively, the phenomena of fissure water and subsurface erosion of the large-thickness highly weathered sandstone stratum are effectively prevented, and softening and quicksand of the base are prevented.

Description

technical field [0001] The invention relates to the technical field of complex geological deep foundation pit support construction in construction engineering, in particular to a construction method for excavating a deep foundation pit in a large-thickness strongly weathered sandstone layer with combined support of a hollow anchor rod and a high-pressure rotary grouting pile. Background technique [0002] With the rapid development of my country's construction industry, high-rise and super high-rise buildings are rising day by day, the excavation depth of foundation pits is getting deeper and deeper, and the geological conditions are becoming more and more complex. Therefore, the excavation, support and precipitation of deep foundation pits in complex geological environments become a prominent problem in construction. In some areas, strong weathered sandstone layers are often encountered during the excavation of deep foundation pits. The fissure water in the strongly weathere...

Claims

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Application Information

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IPC IPC(8): E02D17/04
Inventor 周岩戴宏阮立龙
Owner GANSU SIXTH CONSTR GRP
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