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A pre-splitting blasting system for foundation pit excavation

A technology of pre-splitting blasting and foundation pit, which is applied in the field of pre-splitting blasting blasthole charging device and blasting system, which can solve the problems that the installation position is difficult to control accurately and affect the effect of pre-splitting blasting, so as to ensure the effect of pre-splitting and reduce The loss of explosive energy, the effect of protective protection

Inactive Publication Date: 2020-08-04
厦门爆破工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that it is difficult to precisely control the installation position during implementation, which will eventually affect the effect of pre-splitting blasting

Method used

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  • A pre-splitting blasting system for foundation pit excavation
  • A pre-splitting blasting system for foundation pit excavation
  • A pre-splitting blasting system for foundation pit excavation

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Effect test

Embodiment Construction

[0025] 1. Pre-splitting blasting blasthole charging system and device

[0026] Such as figure 1 As shown, the pre-splitting blasting is to drill a row of blastholes 10 on the blasting rock 14, the charge device 20 is arranged inside the blasthole 10, and the uncoupled charge method is adopted, and the front blaster 21 is blasted in the main blast zone 12 where the blast center 11 is located. The internal electronic detonator is detonated, and the row of charge devices is detonated, so that the rock 14 is pulled off at the excavation surface, forming a contour line 13 that runs through the fissure neatly.

[0027] In order to achieve precise control of the effect of pre-splitting blasting and obtain an ideal blasting contour, the idea of ​​this patent is to overcome the traditional random charging method and adopt a precisely designed charging structure to ensure the setting of the explosive in the blast hole. The blasting can be carried out at a certain position, and at the s...

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Abstract

The invention discloses a presplitting blasting system used for foundation pit excavation. The system comprises a row of blast holes formed in blasting rock, charging devices are arranged in the blastholes, electronic detonators in the charging devices are connected with an outer exploder through wires, before the main blasting area where the blasting center is located is blasted, the exploder detonates the electronic detonators in a time-difference-free manner, the charging devices are detonated, the rock is pulled cut on the excavation face, and the in-order contour line penetrating the gapis formed; each charging device comprises a sealed cylinder, a supporting rod, a bottom base layer, the corresponding electronic detonator and multiple explosives in series connection through a detonating cord, wherein the supporting rod, the bottom base layer, the corresponding electronic detonator and the multiple explosives are arranged in the cylinder, hole plugs are arranged on the top endsof the cylinders, and the cylinders are filled with water media. The system solves the problems that in traditional presplitting blasting, the mounting random of explosives is large, and the blastingprecision is not high, and the integrality of the presplitting blasting contour line is ensured.

Description

technical field [0001] The invention belongs to the technical field of blasting engineering, and in particular relates to a pre-splitting blasting hole charge device and a blasting system for foundation pit excavation. Background technique [0002] Pre-splitting blasting is widely used in underground excavation engineering, slope treatment, and large-scale blasting anti-vibration and shock absorption projects. Pre-splitting blasting refers to blasting a penetrating crack with a certain width along the design contour line before blasting in the main blasting area during rock excavation, so as to buffer and reflect the vibration wave of excavation and blasting and control its impact on the retained rock mass. The destructive influence makes it obtain a smoother excavation profile. Pre-splitting blasting is not only widely used on vertical and inclined excavation walls; pre-splitting blasting is also used on regular curved surfaces, twisted surfaces, and horizontal foundation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/04F42D1/00F42D1/08
CPCF42D1/00F42D1/08F42D3/04
Inventor 刘文辉许黎明林中原张大成李少波肖绍清杨朝阳林树枝刘典基杨育林友辉沈顺平
Owner 厦门爆破工程有限公司
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