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Axial embedded blast hole of reinforced concrete beam and blasting demolition method

A technology of reinforced concrete beams and blastholes, which is applied in blasting, building maintenance, construction, etc., can solve the problems of blasting blockage and blasting network connection operation, heavy workload, multiple detonators and blocking materials, and easy misoperation, etc., to achieve improvement Effect of blasting and fragmentation, reduction of consumption of explosives and detonators, effect of reducing workload

Active Publication Date: 2015-10-07
HUBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach has many disadvantages: 1. Due to the existence of steel bars (especially densely distributed stirrups) in concrete beams, it is very difficult to drill holes, and the drilling costs are often very high
2. The blast holes arranged perpendicular to the axis of the beam have a low utilization rate during blasting (especially when the cross-sectional size of the beam is not large), and a large part is used for plugging, and the effective length for charging is small; Many holes, requiring more detonators and plugging materials
3. Due to the large number of blasting holes and detonators, the operation workload of blasting blockage and blasting network connection is very heavy, and misoperation and mistakes such as squibs are prone to occur.

Method used

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  • Axial embedded blast hole of reinforced concrete beam and blasting demolition method
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  • Axial embedded blast hole of reinforced concrete beam and blasting demolition method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The width×height×length of the reinforced concrete beam is 0.4m×0.6m×4m, and the PVC pipe with a diameter of 30 mm is embedded as the embedded blast hole, which is arranged on the longitudinal center axis of the beam, the length is 4 m, and the two ends are open in the beam End cross section. Emulsion explosives have a diameter of 25mm and a length of 0.2m, with a discontinuous charge structure and 0.2m spacing.

[0039] According to the above-mentioned axial embedded blast hole and blast hole charge structure, the construction process of the present invention is:

[0040] 1) Destroy the concrete protective layer, find the PVC embedded pipe, and clean the pipe with compressed air;

[0041] 2) Bind the drug pack on the detonating cord discontinuously at 0.2m intervals, and then send it into the embedded pipe;

[0042] 3) Detonate the detonating cord.

Embodiment 2

[0044] The width × height × length of the reinforced concrete beam is 0.6 m × 0.9 m × 6.5 m, and both ends of the beam are not visible. Two PVC pipes with a diameter of 30mm are pre-embedded and arranged in the longitudinal direction of the beam as a pre-embedded blast hole. The middle section is parallel to the longitudinal axis of the beam, and the ends are bent upward and open on the upper surface near the end of the beam. The distance between the two blast holes is 0.3m and the distance between the left and right sides of the beam is 0.3m; the upper blasthole is 0.3m from the upper surface of the beam, and the lower blasthole is 0.3m from the lower surface of the beam. The discontinuous charge is adopted, the diameter of the emulsification drug roll is 25mm, the length of the drug roll is 0.2m, and the interval is 0.2m.

[0045] According to the above-mentioned axial embedded blast hole and blast hole charge structure, the construction process of the present invention is:...

Embodiment 3

[0050] The width × height × length of the reinforced concrete beam is 1.4m×2.1 m×6m. Two PVC pipes with a diameter of 32mm are embedded in the longitudinal direction of the beam as embedded blast holes, parallel to the beam axis, and open on the cross section of the beam end. The distance between the two blast holes is 0.7m and the distance between the left and right sides of the beam is 0.7 m; the upper blasthole is 0.7m from the upper surface of the beam, and the lower blasthole is 0.7m from the lower surface of the beam. The continuous charge structure is adopted, and the hole is blocked by gun mud. Adopting a 28mm diameter water gel explosive charging tube with a length of 0.2m.

[0051] According to the above-mentioned axial embedded blast hole and blast hole charge structure, the construction process of the present invention is:

[0052] 1) Destroy the concrete protective layer, find the PVC embedded pipe, and clean the pipe with compressed air;

[0053] 2) Use w...

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Abstract

The invention provides an axial embedded blast hole of a reinforced concrete beam and a blasting demolition method. The blast hole is formed in the mode that a pipe is embedded in the beam in the axial direction, continuous or discontinuous charging is adopted in the blast hole, a detonating fuse is arranged in the blast hole in an overall-length mode, a stirrup is cut off, and other technical means are taken. In this way, drilling operation is avoided, the number of blast holes and the number of detonators are reduced, consumption of explosive and the detonators is reduced, the smashing effect on reinforced concrete is improved, and the damage of explosion to the environment is reduced. The axial embedded blast hole of the reinforced concrete beam and the blasting demolition method can bring remarkable economic and social benefits.

Description

technical field [0001] The invention relates to the field of blasting engineering, in particular to a structure in which a reinforced concrete beam axially embeds a blast hole, and a demolition blasting technique utilizing the pre-buried blast hole. Background technique [0002] During the construction of the project, many reinforced concrete beams need to be demolished. Blasting technology is an efficient means of demolition of reinforced concrete beams. For the blasting demolition of reinforced concrete beams, the common practice in engineering is to construct blastholes and carry out blasting operations when buildings are to be demolished, and the arranged blastholes are perpendicular to the beam axis. This approach has many disadvantages: 1. Due to the existence of steel bars (especially densely distributed stirrups) in concrete beams, it is very difficult to drill holes, and the drilling cost is often very high. 2. The blast holes arranged perpendicular to the axis of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/02F42D1/08E04G23/08
Inventor 程大春叶建军明军
Owner HUBEI UNIV OF TECH
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