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Method for constructing tunnel by finishing full section curtain grouting from upper-half section

A curtain grouting and tunnel construction technology, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of difficult construction, long construction period, unsafe construction, etc., to shorten the construction period, reduce construction difficulty, and ensure construction. quality effect

Active Publication Date: 2011-03-30
2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of long construction period, high construction difficulty and unsafe construction in the existing full-section curtain grouting construction in complex geological sections, the present invention provides a construction method for the upper half section of the full-section curtain grouting tunnel

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  • Method for constructing tunnel by finishing full section curtain grouting from upper-half section
  • Method for constructing tunnel by finishing full section curtain grouting from upper-half section

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Embodiment Construction

[0028] List the following engineering examples to further illustrate the grouting method of the present invention:

[0029] 1. Project introduction:

[0030] The Qiyueshan super-long tunnel is located 23km north of the west of Lichuan City, Hubei Province. It starts from Leyuangou, the wild tea township in the east, and crosses Qiyueshan and Jingzhuyuan in the northwest. It exits at Xiazhenzui in Baizhanggou. , the exit mileage is DK371+778, the total length is 10523m, the maximum buried depth of the cave body is 670m, and the whole cave is drained from one side. The geological structures traversed by the tunnel are the Qiyueshan anticline and the Jianzhuxi syncline. The geological conditions are extremely complex, and they are the key and controlling projects of the whole line. The tunnel passes through about 4.7km of soluble rock in the formation, accounting for 45% of the tunnel length. The main engineering geological problems include: karst and karst high-pressure water i...

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Abstract

The invention relates to the field of tunnel construction, in particular to a method for constructing a tunnel by finishing full section curtain grouting from an upper-half section, which solves the problems of long construction period, difficult construction, high construction safety risk and the like during full section curtain grouting construction of a complex geological section. The method comprises the following steps of: firstly, excavating the upper-half section, and strengthening the support of a tunnel face; secondly, constructing a temporary inverted arch and a grout-stopping wall of the upper-half section; thirdly, excavating the lower-half section in place, and strengthening the support of the tunnel face; fourthly, constructing a grout-stopping wall of the lower-half section; fifthly, forming grouting holes on the upper-half section, wherein the maximum elevation angle alpha is between 25 and 45 degrees, the maximum depression angle beta is between 30 and 70 degrees, andthe longitudinal strengthening length is between 15 and 30 m; sixth, performing grouting operation; seventh, constructing a large-scale lead pipe roof; eighth, excavating a grout-stopping wall; ninth, excavating a tunnel trunk; and finally, continuously cycling by taking an area of 15 to 30 m as a grouting strengthening cycling section to realize the construction of the tunnel by curtain groutingfrom the upper-half section. The method can greatly reduce the construction difficulty, shorten the construction period, and ensure the construction quality, and the construction is safe, quick and economic, so the method can be widely used in the field of tunnel construction.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for a full-section curtain grouting tunnel with an upper half section completed. Background technique [0002] Under the guidance of the "leap-forward" development strategy of railways, my country's railway engineering has made great progress. At the same time, as the speed requirements are getting higher and higher, the construction line is severely restricted, and a large number of tunnel projects pass through geologically complex areas. Under the condition of ensuring safety, the construction method with the least investment and the fastest construction progress is particularly important. In areas with particularly complex geology, curtain grouting has the advantages of less investment, easy operation, low energy consumption, construction safety and fast construction progress compared with other full-section reinforcement construction methods. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10E21D11/38
Inventor 骆文学刘丽花祁玺剑雷军杨新兴
Owner 2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP
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