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Excavation method of tunnel shaft

A shaft and tunnel technology, applied in shaft equipment, drilling equipment and methods, well sinking and other directions, can solve the problems of long safety risk period, low construction efficiency, high safety risk, etc., to reduce safety risks, improve construction efficiency, The effect of high safety

Inactive Publication Date: 2020-02-21
CHINA RAILWAY NO 2 ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the prior art in urban tunnel shaft construction, it is not suitable to adopt the blasting method for excavation, if there is no passage at the bottom, the excavation efficiency is low by using the non-blasting front shaft method, and the long-term deep foundation in the excavation process Under the pit operation, the safety risk period is long, the safety risk is large and the above shortcomings, providing a tunnel shaft excavation method

Method used

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  • Excavation method of tunnel shaft

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Embodiment 1

[0039] Such as figure 1 As shown, a method for excavating a tunnel shaft according to the present invention comprises the following steps:

[0040] a, stake out the central position of the vertical shaft 1, mark the excavation range of the vertical shaft 1 according to the positioning center point, and then construct the reinforced concrete lock and the ground beam at the wellhead of the vertical shaft 1;

[0041] b. In the range to be excavated of the shaft 1, mark the range to be excavated of several holes-2, there is an interval between two adjacent holes-2, the interval is 10-20cm, and then use Excavate all the holes 1-2 sequentially in the order of the periphery first and then the center. When excavating all the holes 1-2, excavate every other hole. After each hole 2 is excavated to the bottom, mix the drilling slag with cement Backfilling back into the corresponding hole-2, and then excavating the next hole-2;

[0042] c. After the last hole-2 is backfilled, carry out ...

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Abstract

The invention relates to the technical field of tunnels and underground projects, in particular to an excavation method of a tunnel shaft. By drilling a plurality of holes of smaller diameters at themoment, the underground water condition, the adverse geology condition and the like can be pre-judged, the matching degree of geological exploration data can be verified conveniently, so that guidancecan be provided for follow-up construction, and the construction risk and difficulty are lowered; and meanwhile, excavation is conducted from the upper side to the lower side, the limitation of forming a main tunnel at the bottom of the shaft is not needed, the non-explosion type construction manner can be adopted, and therefore the safety is high; rock and soil can be drilled loose in advance,the construction efficiency of excavation is improved, the work period is shortened, especially the operation time of an artificial deep foundation pit is shortened, the safety risk is effectively lowered, and construction cost is saved; and the excavation method of the tunnel shaft has broad popularization significance.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a tunnel shaft excavation method. Background technique [0002] At present, in underground projects at home and abroad, such as water conservancy and hydropower projects, coal mine projects, petroleum projects, highway and railway long tunnel traffic projects, subway projects, etc., shaft construction is very common. According to different construction conditions, the construction methods are also different. Mainly There are front well method and raise drilling rig method for excavation. According to the geological conditions and groundwater conditions, the enclosure structure and water stop measures can be taken in advance before excavation. [0003] The front shaft method is mainly suitable for construction under the condition that there is no passage at the bottom of the shaft, that is, the flat hole at the bottom of the shaft has not yet been forme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D1/03E21D1/08E21B7/00
CPCE21B7/00E21D1/03E21D1/08
Inventor 徐强何开伟李强
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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