Refined blast construction method for narrow deep foundation pit under complicated geological condition

A technology with complex geological conditions and construction methods, applied in the field of fine blasting construction of narrow and deep foundation pits, can solve problems such as inefficiency and cumbersome rock mass crushing efficiency, and achieve the effects of precise blasting energy control and precise and controllable blasting range.

Active Publication Date: 2020-07-24
CHINA RAILWAY 18TH BUREAU GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Finally, the obvious disadvantage of patent 2 is that it is cumbersome to use the steel bar plus square wire device for setting and the rock mass crushing efficiency is not efficient

Method used

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  • Refined blast construction method for narrow deep foundation pit under complicated geological condition
  • Refined blast construction method for narrow deep foundation pit under complicated geological condition
  • Refined blast construction method for narrow deep foundation pit under complicated geological condition

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Embodiment Construction

[0054] In order to further understand the content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are given below with reference to the accompanying drawings. It should be noted that this embodiment is descriptive, not restrictive, and cannot thereby limit the protection scope of the present invention.

[0055] A refined blasting construction method for narrow and deep foundation pits under complex geological conditions, comprising the following steps:

[0056] Step 1: Level the ground of the foundation pit site first, and then carry out the positioning construction of the lattice column construction of the underground diaphragm wall and the construction of the crown beam and the first concrete support on the site after leveling;

[0057] Step 2: Carry out earthwork excavation. When the foundation pit is excavated, when the rock layer is encountered, use an excavator to clean the overlying soil layer on the roc...

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Abstract

A refined blast construction method for a narrow deep foundation pit under a complicated geological condition comprises the following steps: step 1, flattening a field; step 2, excavating earth in a foundation pit area; step 3, carrying out trench blast construction and shallow hole step blast of a main blast area foundation pit; step 4, performing static breaking excavation on a diaphragm wall and rock in the area near latticed columns; and step 5, conducting waist beam and support construction, and then repeating construction in the steps 3-5 until the foundation pit is excavated. The methoddivides different blast areas, the refined combined blast excavation manner is adopted, and a convenient construction method is provided for excavation of the narrow rocky deep foundation pit. By arrangement of the protection scope of the latticed columns and diaphragm walls, the refined construction method combining trench blast, shallow hole step blast and static blast is adopted, and rapid breaking construction is performed on foundation pit rock. The arrangement of construction of edge expansion assisted holes fully utilizes the stress of rock, the excavation efficiency is improved, and the vibration damage of blast is reduced.

Description

technical field [0001] The invention relates to the technical field of blasting construction, and relates to a blasting construction method, in particular to a refined blasting construction method for narrow and deep foundation pits under complex geological conditions. Background technique [0002] With the continuous deepening of urban construction in our country, urban rail transit projects have developed rapidly, and there are more and more corresponding deep foundation pit projects. Usually, most of the subway lines pass through the central area of ​​the city, with dense buildings (structures), various pipelines criss-crossing, heavy traffic, and dense pedestrians, which increases the difficulty of subway construction, especially in the parts where deep foundation pit construction must be carried out, and the construction risk bigger. [0003] In most cities in China, excavation of deep foundation pits using excavators equipped with grabs or mechanical excavation with l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D1/08F42D3/04
CPCF42D1/00F42D1/08F42D3/04
Inventor 刘洪亮雷锋国彭光火高鹏陈晓忠张尚贵郭佳焦叶飞卢旺张敏绳鹏程袁凯夏宁斌邓宏涛李志伟方帆
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
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