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Method for carrying out bench cut method construction in IV-grade surrounding rocks by using three-arm drill jumbo

A technology of rock drilling jumbo and step method, which is applied in the direction of blasting, etc., which can solve the problems of slow drilling speed, high energy consumption, and harsh working environment, etc., achieve fast drilling time, improve the working environment, and reduce drilling and blasting Quantity effect

Inactive Publication Date: 2016-05-25
CCCC TUNNEL ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Three-arm rock drilling rigs are generally suitable for excavating large-section tunnels. In grade IV surrounding rock tunnels with poor surrounding rock geological conditions, manual hand-held pneumatic rock drills are generally used to drill and blast the upper steps, but the drilling speed is slow and the energy consumption is low. High consumption and poor working environment

Method used

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  • Method for carrying out bench cut method construction in IV-grade surrounding rocks by using three-arm drill jumbo
  • Method for carrying out bench cut method construction in IV-grade surrounding rocks by using three-arm drill jumbo
  • Method for carrying out bench cut method construction in IV-grade surrounding rocks by using three-arm drill jumbo

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Embodiment

[0018] The method of using the three-arm rock drilling rig in the step method construction in the surrounding rock of grade IV in this embodiment, such as image 3 As shown, follow the steps below:

[0019] (1) Construction preparation: Use Komatsu PC220-8 excavator to carry out the risk elimination work, the duration is about 30min, the line is laid out according to the tunnel construction design drawing, the setting out error of the surrounding contour line should not be greater than ±2cm, such as figure 1 As shown, the line setting uses the total station to accurately release the tunnel excavation contour line and the tunnel center line, and use red paint to mark the over-excavation and under-excavation in the previous cycle, and follow the blasthole layout diagram. figure 2 The position of the blastholes of the upper step is marked as shown; the distance between the cut holes 4 of the upper step is 50-80cm, the depth is 2.3m, a total of 16 cut holes 4, the auxiliary holes 5 ar...

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Abstract

The invention belongs to the technical field of tunnel rock mass construction, and particularly relates to a method for carrying out bench cut method construction in IV-grade surrounding rocks by using a three-arm drill jumbo. According to the method for carrying out bench cut method construction in the IV-grade surrounding rocks by using the three-arm drill jumbo, which is disclosed by the invention, a construction section is excavated by adopting smooth blasting; the characteristics of rapidness, positioning accuracy and safety of the three-arm drill jumbo are sufficiently utilized; drilling time is short; an extrapolation angle is easy to control; a drilling and blasting footage of the construction section is shortened; each cycle of drilling and blasting numbers are reduced; and particularly, the three-arm drill jumbo is used for carrying out drilling and blasting for the first time in the excavating process of an upper bench, and manual drilling and blasting are adopted on a lower bench, so that the rapid and accurate drilling operation is achieved, cycle operation time is reduced, and when drilling and blasting quality and operation efficiency are improved, the operation environment is improved, thereby improving integral efficiency of tunnel construction.

Description

Technical field [0001] The invention belongs to the technical field of tunnel rock mass construction, and in particular relates to a step method construction method using a three-arm rock drilling rig in grade IV surrounding rock. Background technique [0002] With the continuous progress of engineering construction, the engineering geological conditions for long and large tunnels will become more and more complex, and there will be more and more weak surrounding rock geology. The grade IV surrounding rock mass is broken, the rock mass is severely weathered, and the joints are developed and stable. The short time, coupled with the large span of the excavation of the cavern, is prone to large collapses during construction, and the sidewalls are easy to lose stability. The number of workers holding pneumatic drills during tunnel drilling and blasting will gradually decrease, the cost will become higher and higher, and the risk of casualties will increase. At present, mechanical exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/00
CPCF42D1/00F42D3/00
Inventor 陈玉奎李玉明王冠淇汤春阳王猛国小亮李旭阳贾智科姜艳超
Owner CCCC TUNNEL ENG
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