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Charging, blocking and slag pressing structure of demolition blasting blast-holes of reinforced concrete beam and demolition blasting method

A technology for charging reinforced concrete beams and blastholes, which is applied in blasting and other directions, can solve the problems of failure to achieve the expected blasting effect, broken reinforced concrete beams, and increased blasthole costs, so as to facilitate the safety protection of blasting and reduce the total cost. Cost, the effect of reducing the flying speed of flying stones

Active Publication Date: 2014-12-17
江苏东旭建设发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of steel bars in concrete beams (especially the densely distributed stirrups), it is very difficult to drill holes, and adding blast holes will cause a sharp increase in cost; reducing the consumption of unit explosives often fails to blow up reinforced concrete beams, which is not up to expectations Blasting effect; Sprinkling water to reduce dust due to large water droplets, the effect of dust reduction is not good

Method used

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  • Charging, blocking and slag pressing structure of demolition blasting blast-holes of reinforced concrete beam and demolition blasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Reinforced concrete beam cross-section width × height dimension is 0.6 m × 0.8 m, blast hole depth 0.5 m (minimum resistance line 0.3 m), blast hole diameter 32 mm, emulsion explosive charge length 0.2 m, blast hole plugging material layer The depth is 0.3 m, and the hole spacing is 0.6 m. The blast holes are pre-embedded with plastic pipes on the longitudinal centerline of the upper surface of the reinforced concrete beam. Adopt nonel and nonel delay detonator. The slag pressing water bag adopts a polyethylene film bag with a size of 0.8 m×0.4 m, and one water bag is used for each blast hole; when pressing slag, the center of the water bag is aligned with the blast hole, and the length direction is consistent with the longitudinal direction of the reinforced concrete beam.

[0026] The material formula (by weight) of the blast hole plugging material layer is 1 part of 801-2 type construction glue, 1 part of construction gypsum, and 1 part of tap water;

[0027] The ...

Embodiment 2

[0038] Reinforced concrete beam cross-section width × height dimension is 1.2 m × 1.4 m, blast hole depth 1.0 m (minimum resistance line 0.4 m), blast hole diameter 32 mm, emulsion explosive charge length 0.64 m, blast hole plugging material layer The depth is 0.36m, the distance between blastholes is 0.7m, and two rows of blastholes are symmetrically arranged on both sides of the longitudinal center line on the upper surface of the reinforced concrete beam, with a row spacing of 0.4m. Adopt nonel and nonel delay detonator. The slag pressing water bag is a polyethylene film bag with a size of 0.8 m × 0.4 m, and one water bag is used for each blast hole; when the water bag is slag pressing, its center is aligned with the blast hole, and its length direction is consistent with the longitudinal direction of the reinforced concrete beam.

[0039] The material formula (by weight) of the blast hole plugging material layer is 1 part of 801-2 type construction glue, 1.5 parts of t...

Embodiment 3

[0051]Reinforced concrete beam cross-section width × height dimensions are 0.6 m × 0.9 m, blast hole depth 0.6 m (minimum resistance line 0.3 m), blast hole diameter 32 mm, emulsion explosive charge length 0.27 m, plugging material layer depth 0.33 m, the blast hole spacing is 0.7 m, and the blast holes are arranged on the centerline of the upper surface of the reinforced concrete beam by pre-embedding plastic pipes. Adopt nonel and nonel delay detonator. The slag pressing water bag is a polyvinyl chloride film bag with a size of 0.7 m×0.4 m, and one water bag is used for each blast hole; when slag pressing, the center of the water bag is aligned with the blast hole, and the length direction is consistent with the longitudinal direction of the beam.

[0052] The material formula (in parts by weight) of the blast hole plugging material layer is 1 part of 801-2 type construction glue, 2 parts of tap water, and 1 part of α-type hemihydrate gypsum;

[0053] The film thickne...

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Abstract

The invention discloses a charging, blocking and slag pressing structure of demolition blasting blast-holes of a reinforced concrete beam and a demolition blasting method. The demolition blasting method is characterized in that the technical measures of disconnecting stirrups arranged at one side or two sides of the reinforced concrete beam, blocking the blast-holes by using gypsum which is mixed with an adhesion agent and pressing the blast-holes by using water bags are adopted, and thus the contradiction between the demolition blasting effect of the reinforced concrete beam and safety as well as between the demolition blasting effect and environment protection is well solved. The charging, blocking and slag pressing structure and the demolition blasting method, disclosed by the invention, have the beneficial effects that the technical measures are jointly adopted, thus the bounding stress of the stirrups on concrete during blasting is reduced, the blasting and crushing effect is improved, and blasting safety protection and blasting dust control are facilitated; the construction is convenient, the explosive consumption and the post processing and cleaning cost are reduced, and significant economic and environment benefits are obtained.

Description

technical field [0001] The invention relates to the field of blasting engineering, in particular to a blasting construction method for demolition blasting of reinforced concrete beams, a structure for charging, blocking and slag pressing, and a blasting construction method for demolition of reinforced concrete beams. Background technique [0002] During urban construction, many reinforced concrete beams (such as temporary support beams for foundation pits) need to be demolished. Blasting technology is an efficient means of demolishing reinforced concrete, but its use in urban environments requires special attention to safety. This requires finding a balance between blasting effect and blasting safety. On the one hand, it is necessary to smash the reinforced concrete beams as much as possible, and on the other hand, it is necessary to minimize the damage to surrounding buildings and the impact on the environment by blasting, so as to achieve safe and environmentally friendly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/00F42D1/18
Inventor 程大春叶建军董小珂
Owner 江苏东旭建设发展有限公司
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