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Construction method for hard rock deep foundation pit in limited blasting area

A construction method and technology for deep foundation pits, which are applied in basic structure engineering, excavation, construction, etc., can solve the problems of slow construction efficiency and high cost, and achieve the effects of fast construction progress, small vibration and saving construction costs.

Pending Publication Date: 2022-04-12
CHINA RAILWAY NO 2 ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of slow construction efficiency and high cost in the existing non-explosive construction technology, provide a hard rock deep foundation pit construction method in the restricted blasting area, and shorten the hard rock deep foundation pit construction method in the restricted blasting area. Construction time, saving construction cost and improving construction efficiency

Method used

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  • Construction method for hard rock deep foundation pit in limited blasting area
  • Construction method for hard rock deep foundation pit in limited blasting area
  • Construction method for hard rock deep foundation pit in limited blasting area

Examples

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Effect test

Embodiment 1

[0041] Such as figure 1 As shown, a hard rock deep foundation pit construction method in a restricted blasting area includes the following steps:

[0042] Clean up the accumulated soil 1 above the top surface of the hard rock 2 in the excavation area, and construct the soil support structure on the excavated deep foundation pit wall;

[0043] Deep foundation pit layering steps: After the supporting structure is completed in the excavated deep foundation pit, the deep foundation pit soil in the excavation area is divided into N layer mixed soil and M layer hard rock soil from top to bottom, as shown in figure 2 As shown, N is 3 layers, and M is 7 layers. Each layer of mixed soil includes accumulated soil 1 and hard rock 2, and each layer of hard rock soil is hard rock 2. The depth of each layer of mixed soil is 1.3mm. The depth of layer hard rock soil is 1.3mm.

[0044]Mixed layer soil excavation steps: the mixed layer soil is excavated from top to bottom layer by layer acco...

Embodiment 2

[0055] This embodiment is similar to Embodiment 1, and the difference is that this embodiment divides the deep foundation pit soil in the excavation area from top to bottom into N-layer mixed soil and M-layer hard rock soil, such as Figure 6 As shown, N is 4 layers, M is 8 layers, the depth of each layer of mixed soil is 1.5m, and the depth of each layer of hard rock soil is 1.5m.

Embodiment 3

[0057] This embodiment is similar to Embodiment 1, and the difference is that the deep foundation pit soil in the excavation area is divided into M layers of hard rock soil from top to bottom in this embodiment, such as Figure 6 As shown, the mixed soil layer is not divided, M is 5 layers, and the depth of each layer of hard rock soil is 1.8m.

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Abstract

The invention discloses a hard rock deep foundation pit construction method in a limited blasting area, which comprises the following steps of: cleaning accumulated soil above the top surface of hard rock in an excavation area, and constructing a soil supporting structure on the wall surface of an excavated deep foundation pit; the deep foundation pit is layered, specifically, the deep foundation pit soil body in the excavation area is divided into N layers of mixed soil bodies and M layers of hard rock-soil bodies from top to bottom, each layer of mixed soil body comprises accumulated soil and hard rock, and each layer of hard rock-soil body is hard rock; excavating N layers of mixed layer soil bodies: excavating the first layer to the Nth layer of the mixed layer soil bodies layer by layer from top to bottom according to the excavating step of each layer of the mixed layer soil bodies; and M layers of hard rock-soil bodies are excavated, specifically, excavation of the first layer to the Mth layer of the hard rock-soil bodies is completed layer by layer from top to bottom according to the excavation step of each layer of hard rock-soil bodies. According to the construction method of the hard rock deep foundation pit, the time for constructing the hard rock deep foundation pit in the limited blasting area is shortened, the construction cost is saved, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of earthwork excavation, in particular to a method for constructing a deep foundation pit of hard rock in a restricted blasting area. Background technique [0002] Now along with the continuous growth of my country's economy and the continuous progress of science and technology, my country's civil engineering industry has developed rapidly, and various foundation pit projects have sprung up like mushrooms after rain. Affected by complex geological conditions, the difficulty of foundation pit construction is also different. Among them, the construction of deep foundation pits in hard rock belongs to the category of relatively difficult construction. Deep foundation pits in hard rock formations are combined with geological conditions of soft rock at the top and hard at the bottom. The excavation of deep foundation pits in hard rock is generally carried out by explosive blasting. Explosive blasting is fast in c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/04
Inventor 苗宇滔梁鑫王鑫卢沛沛瞿晶张志勇
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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