Negative excavation blasting structure and method for nuclear island corridor foundation pit

A ring corridor and foundation pit technology, applied in blasting and other directions, can solve the problems of failing to achieve the ultimate goal of foundation pit excavation, weakening the damage force of the main blasting to the wall of the ring corridor, and large blasting vibrations.

Active Publication Date: 2022-02-08
CHINA NUCLEAR IND 22ND CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent can only be used for the formation of pre-cracks in the ring corridor of the nuclear island to reduce the damage to the wall of the ring corridor by the blasting of the main body, but cannot be used for the removal of rocks that need to be excavated by blasting in the foundation pit. The ultimate purpose of pit excavation, and when the foundation pit is excavated, there will still be a large blasting vibration, which will affect the surrounding buildings

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  • Negative excavation blasting structure and method for nuclear island corridor foundation pit
  • Negative excavation blasting structure and method for nuclear island corridor foundation pit
  • Negative excavation blasting structure and method for nuclear island corridor foundation pit

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Embodiment Construction

[0036] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0037] Such as Figure 1-3 As shown, a negative excavation blasting structure of the ring gallery foundation pit of the nuclear island of the present invention is formed by enclosing the blasting area 1 of the ring gallery foundation pit by the inner ring line 2 and the outer ring line 3;

[0038] The blasting area 1 of the ring corridor foundation pit is divided into multiple blasting intervals, and the multiple blasting intervals are divided into two first blasting intervals 101, two second blasting intervals 102, and two third blasting intervals 103 along the direction close to the protected area. and two fourth blasting intervals 104;

[0039] A plurality of first pre-split holes 201 are arranged at intervals on the i...

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Abstract

The invention discloses a negative excavation blasting structure and method for a nuclear island corridor foundation pit. A blasting area of a corridor foundation pit is defined by an inner ring line and an outer ring line; the blasting area of the corridor foundation pit is divided into a plurality of blasting sections; a plurality of first pre-splitting holes are formed in the inner ring line at intervals, and a plurality of second pre-splitting holes are formed in the outer ring line at intervals; at least one row of first slotting holes are formed between every two adjacent blasting intervals; a plurality of first main blasting holes are formed in each blasting section at intervals; and the first pre-splitting holes, the second pre-splitting holes, the first slotting holes, second slotting holes and the first main blasting holes are each provided with a charging section and a filling section. Ideal inner and outer circumferential cracks of the corridor can be formed at a preset position of a rock foundation, then main explosion with the purpose of removing rock in the corridor can be carried out, meanwhile, corresponding reasonable measures are taken in consideration of technical requirements such as vibration and allowance, so that the construction operation of negative excavation of a nuclear island corridor foundation pit can be quickly completed with high quality.

Description

technical field [0001] The invention relates to the technical field of nuclear power engineering, in particular to a negative excavation blasting structure and blasting method for a nuclear island ring gallery foundation pit. Background technique [0002] In the prior art, there are certain technical defects in the method of excavating the ring corridor of the nuclear island. For example, the Chinese patent whose publication number is CN101368812A discloses a pre-splitting blasting method for the ring corridor of the nuclear island. The steps are as follows: The position is dug down according to the elevation of the center of the nuclear island, and a reserved layer is reserved; holes are drilled at equal intervals along the inner and outer circumferences of the ring corridor; flexible materials are placed at the bottom of the holes as a cushion layer; And the hole with the plugging depth left at the orifice is divided into three sections of charge, the bottom is the reinfor...

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 易意林李萌周益刘建木彭小松花强罗攀李汶锴郭永宽芦余送
Owner CHINA NUCLEAR IND 22ND CONSTR
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