Construction method for pretreatment of bedrock and/or boulder stratum in shield tunnel

A construction method and technology of shield tunneling, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as exceeding the adaptation range, complicated geological conditions, and unsmooth tunneling of shield machines, so as to improve construction progress and reduce replacement The effect of the number of knives

Inactive Publication Date: 2018-12-18
CHINA RAILWAY 12TH BUREAU GRP +2
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Problems solved by technology

[0002] In the process of excavating a tunnel with a shield machine, the geological conditions in the tunnel area to be excavated are often very complex, and the stratum with bedrock and boulders has extremely high strength, which far exceeds the adaptation range of the shield machine, which is likely to cause the shield machine to Unable to dig smoothly

Method used

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  • Construction method for pretreatment of bedrock and/or boulder stratum in shield tunnel
  • Construction method for pretreatment of bedrock and/or boulder stratum in shield tunnel
  • Construction method for pretreatment of bedrock and/or boulder stratum in shield tunnel

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Embodiment approach

[0041] According to one embodiment of the present invention, as image 3 As shown, preferably, the offshore drilling construction includes the following steps: use theodolite or total station to determine the drilling position of the bedrock surface of the seabed; move the drilling ship 7 to align with the drilling position; At the drilling position, the drill ship uses a drill hammer to hammer the steel casing 5 into the bedrock surface 6 of the seabed; carry out the blast hole drilling operation in the steel casing 5 until it reaches the The bedrock layer is designed to be positioned at depth to create blastholes.

[0042] In subsea tunnel construction, under the situation that described unfavorable geologic section is seabed bedrock, use offshore drilling ship 7 to carry out drilling operation, at first use theodolite or total station to determine the drilling position of seabed bedrock surface, theodolite is A measuring instrument for measuring horizontal and vertical ang...

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Abstract

The invention provides a construction method for pretreatment of bedrock and/or boulder stratum in a shield tunnel, which comprises the following steps: 1) physical exploration of geological section within the range of a tunnel to be excavated is carried out; the geological section where bedrock and/or boulder exist in the strata to be excavated by a shield machine is identified as bad geologicalsection; 2) the location of a blasting hole within the range of the bad geological section is confirmed and the blasting hole is formed by drilling construction; 3) the blasting hole is loaded with adetonating charge to carry out blasting operations; 4) broken surrounding rock is reinforced by sublevel grouting in the bad geological section after blasting. The construction of the shield tunnel can be carried out smoothly, the construction progress can be speeded up and the frequency of tool-changing can be reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for pretreatment of bedrock and boulder formations encountered by shield tunnels. Background technique [0002] In the process of excavating a tunnel with a shield machine, the geological conditions in the tunnel area to be excavated are often very complex, and the stratum with bedrock and boulders has extremely high strength, far exceeding the adaptation range of the shield machine, which may easily cause the shield machine to Unable to dig smoothly. Contents of the invention [0003] The purpose of the present invention is to provide a construction method for pretreatment of bedrock and boulder formations in shield tunnels, aiming at the characteristics of high strength of bedrock or boulders in the tunnel sections to be excavated on land or seabed. [0004] The construction method for the pretreatment of the shield tunnel encountering bedro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06E21D11/10
Inventor 李晓刘东双刘新荣赵香萍高志峰
Owner CHINA RAILWAY 12TH BUREAU GRP
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