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Boulder blasting construction method

A construction method and boulder technology, applied in blasting and other directions, can solve the problems of affecting the construction progress, poor treatment effect, large boulder particle size, etc., to increase construction safety, improve crushing effect, and increase controllability. Effect

Inactive Publication Date: 2020-01-10
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the verticality of mechanical treatment is not easy to control, the treatment effect is not good, and the required construction period is long, which affects the construction progress
The existing blasting treatment makes the particle size of the blasted boulders larger, the blasting is not complete, and it is easy to damage the cutter head and construction progress

Method used

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  • Boulder blasting construction method
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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] A construction method for boulder blasting, comprising the following steps:

[0040] (1) The 2-bit setting of the blast hole: such as figure 1 As mentioned above, the arrangement range of the blast hole 2 is larger than the scope of the boulder 1, and the charge bag is installed in the blast hole 2 located on the boulder 1, and no charge is installed in the blast hole 2 outside the range of the boulder 1. Bag.

[0041] Boulder 1 blasting is divided into single-hole single blasting and multi-hole single blasting. The 2-position blast hole for single-hole single-body blasting is set at the center of gravity of boulder 1, and the 2-position blast hole for multi-hole single-body blasting adopts plum blossoms. Shaped or rectangular, the distance between adjacent blast holes 2 in the porous single blasting is 0.8-1.2m, and the diameter of blast holes...

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Abstract

The invention discloses a boulder blasting construction method. The construction method comprises the following steps of setting a blast hole position, carrying out drilling construction, carrying outblast hole acceptance, machining an explosive bag, loading an explosive into a blast hole, filling the blast hole, blasting a circuit, carrying out on-site warning, and carrying out detonation, grouting and hole sealing. According to the boulder blasting construction method, the blasting is thorough, the grain size of the boulder after blasting is small, the construction progress of a cutter discis not affected, the damage to the cutter disc is reduced, the service life of the cutter disc is prolonged, and the underground blasting type blasting mode is high in safety.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a blasting construction method for boulders. Background technique [0002] During the excavation and rock breaking process of the shield machine, the boulders have high strength and are widely distributed, with a maximum strength of 110MPa. If the holding force between the boulders and the surrounding soil is insufficient, the boulders will rotate with the cutter head, causing damage to the cutter head and knives. Moreover, using the cutter head to break the rock requires a relatively large thrust, which requires high structural strength of the reaction frame and high cost. [0003] In addition, if the particle size of the crushed stone is larger than the opening size of the grid or the opening door of the originating end is poorly sealed, the mud tank cannot build up pressure, resulting in poor mud slag-carrying capacity, which may easily cause mud to stagnate and block...

Claims

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Application Information

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IPC IPC(8): F42D1/08F42D3/04
CPCF42D1/08F42D3/04
Inventor 张兵王凯陈桥高会中韩伟锋郭璐王雅文王发民杨延栋赵海雷
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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