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Controlled blasting construction method for shallow-buried large-section tunnel

A technology for controlling blasting and construction methods, applied in blasting and other directions, can solve problems such as slow progress, excessive blasting vibration, and unreliable results, and achieve the effects of speeding up construction progress, improving social benefits, and reducing process time.

Active Publication Date: 2013-03-13
2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP
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Problems solved by technology

[0008] The object of the present invention is to provide a controlled construction method for shallow-buried large-section tunnels, aiming at the problems of slow progress, unreliable results and frequent blasting vibration exceeding the standard in existing blasting methods in the process of shallow-buried large-section tunnels

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  • Controlled blasting construction method for shallow-buried large-section tunnel
  • Controlled blasting construction method for shallow-buried large-section tunnel
  • Controlled blasting construction method for shallow-buried large-section tunnel

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] A kind of shallow-buried large-section tunnel control blasting construction method described in the present invention, such as figure 1 shown, including the following steps:

[0030] 1. Construction preparation

[0031] It is mainly the processing of simple drilling trolley. According to the tunnel excavation section size and construction habits, the full-section simple drilling jumbo is processed on site. It is required to install high-pressure air pipes and high-pressure water pipes on the trolley so that they can be directly connected to the air gun through gate valves and connecting hoses; the trolley is equipped with equipment such as power distribution boxes and lighting fixtures for convenient use during construction.

[0032] 2. Detonation test

[0033] The ultimate purpose of the blasting test is to determine the maximum charge per delay detonator i...

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Abstract

The invention discloses a controlled blasting construction method for a shallow-buried large-section tunnel. The method comprises the following steps of: performing trail blasting so as to determine the maximum explosive load; drawing up a controlled blasting scheme, comprehensively analyzing the maximum explosive load of each delay detonator, the cross section of the tunnel, rock characteristic and the characteristic of an initiating explosive device according to a trail blasting result, drawing up a blasting scheme, dividing the entire cross section into a region A, a region B and a region C, wherein each region is provided with an initiation system, the region B delays by 12.5 milliseconds relative to the region A and the region C delays by (800+12.5) milliseconds relative to the region A, blasting in an instant electric detonator initiation mode and realizing full-cross-section blasting through an electronic delay initiator and the delay detonators; blasting; analyzing a blasting effect and a monitoring result; ventilating, mucking and supporting; and measuring and laying out for the next cycle. The method has the advantages of high speed and reliable result and solves the problem of standard exceeding of blasting vibration.

Description

technical field [0001] The invention relates to a controlled blasting excavation method, in particular to a controlled blasting construction method for a shallow-buried large-section tunnel. It is suitable for the construction of tunnels with good geology (level II-III surrounding rock) located in urban areas or buildings with special requirements for blasting vibration. The excavation section is (70-120) m 2 , The buried depth of the tunnel is (15-100) m. Background technique [0002] The tunnel passes through the bustling city, and the buried depth of the tunnel is relatively shallow, and there are many buildings on the surface. The tunnel excavated by the blasting method must control the blasting vibration within the allowable range while ensuring high-quality excavation sections and footage. The safety of the ground surface and buildings, while reducing the impact of blasting vibration on the surrounding people. Excessive blasting vibration will cause harm to the struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/00F42D1/00
Inventor 怀平生焦钢雷军赵香萍
Owner 2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP
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