Excavation and blasting method of pre-drilled medium hole shaft
A shaft and pre-drilling technology, which is applied in blasting and other directions, can solve problems such as failure to meet the requirements of shaft drilling and blasting, and achieve high safety effects
Active Publication Date: 2017-02-01
CHONGQING COMM CONSTR GRP
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Problems solved by technology
However, for the case where the depth and height of the shaft are large, the ordinary drilling and blasting method cannot meet the requirements of shaft drilling and blasting.
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[0028] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0029] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, this embodiment includes the following steps:
[0030] a. Drill holes in the blasting area. After backfilling the middle hole with sand, drill 4 primary blasting slots 1, 4 primary blasting slots 1, and 4 primary blasting slots according to the requirements of the central hole straight hole slotting type. The slot 1 is surrounded by a 2*2 square, and the non-electric millisecond detonators 8 in the slot 1 are clustered together in one blasting;
[0031] Drill out 16 primary blasting auxiliary holes 2a in the first section, 17 primary blasting auxiliary holes 2b in the second section, and 6 primary blasting auxiliary holes 2c and 36 in the third section in the outer ring of the primary blasting cut hole 1 according to the segmented structure 16 primary blasting auxiliary holes 2d in t...
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The invention discloses a pre-drilling mesopore shaft excavation blasting method. The pre-drilling mesopore shaft excavation blasting method includes the following steps: step a, drilling holes in a blasting area, using sands to backfill the mesopore, and then drilling out a primary blasting cutting hole, a primary blasting auxiliary hole and a primary blasting peripheral hole according to a central hollow hole cylinder cut type requirement, step b, loading explosives, step c, detonating the explosives, step d, drilling out a secondary blasting auxiliary hole and a secondary blasting peripheral hole, step e, loading explosives, step f, detonating the explosives, step g, ventilating a downhole, and discharging harmful gas fully, and step h, repeating the step a to the step g, blasting hierarchically up to a designed elevation. By adopting the pre-drilling mesopore shaft excavation blasting method, a drilling and blasting method of two blasting shaping is used to construct, and the central hollow hole can add a free face to a surrounding rock so as to achieve a best blasting effect, and blast-shaking speed is easy to control, accordingly, the pre-drilling mesopore shaft excavation blasting method not only has high safety and explosive reliability, but also can achieve a shaft excavation blasting requirement.
Description
technical field [0001] The invention particularly relates to a method for excavating and blasting a pre-drilled middle-hole vertical shaft. Background technique [0002] A tunnel is a building built underground or underwater or in a mountain, laying a railway or building a road for the passage of motor vehicles. At present, the TBM construction method is widely used in China's water conservancy, hydropower, transportation, mining, municipal and other tunnel projects. TBM refers to a full-face tunnel boring machine. The construction procedures such as excavation, support, and slag discharge are operated in parallel and continuously. With the advantages of environmental protection and high comprehensive benefits, it can realize the construction of long tunnels buried in complex geographical landforms that are difficult to realize by traditional drilling and blasting methods. Before the interval TBM construction, it is necessary to complete the excavation and support of the T...
Claims
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IPC IPC(8): F42D1/00F42D3/04
Inventor 王龙汪平张昶王曙光刘平熊卫士李进李慧英汪岳建李小伟冉鹏
Owner CHONGQING COMM CONSTR GRP