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A method for excavating caverns with variable diameter

A cavern and hole diameter technology, which is applied to earth-moving drilling, underground chambers, and shaft equipment, etc., can solve the problems of surrounding rock damage and the safety impact of intersections, so as to ensure the excavation quality, ensure the molding effect, and reduce disturbance. Effect

Active Publication Date: 2022-03-22
SINOHYDRO ENG BUREAU 4
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned construction method is direct and fast, but it has a great impact on the formation of large-diameter caverns, surrounding rock damage, and safety gear at intersections. At present, the above-mentioned situation needs to be improved

Method used

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  • A method for excavating caverns with variable diameter
  • A method for excavating caverns with variable diameter
  • A method for excavating caverns with variable diameter

Examples

Experimental program
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Embodiment 1

[0031] The irrigation area of ​​the hydropower station in this example involves 21 counties (districts) in 4 cities of Yibin, Luzhou, Zigong, and Neijiang in Sichuan Province and Shuifu County in Zhaotong City, Yunnan Province.

[0032] The second section of the North Main Canal and the first section of the Qiuchang Sub-main Canal are marked as North Main Canal 38+567 ~ Qiuchang Sub-main Canal 9+350, including 4 main line tunnels and 1 inverted siphon in the second section of the Main Canal (underground tunnel excavation structure); Qiuchang is divided into 7 main channel tunnels. The total length of the tunnel is 19,738m, and the longest single tunnel is the Xinwutou-Shuijingbashang tunnel, which is 4,272m long.

[0033] The excavation dimensions of the tunnel sections of the project are circular diameters of 9.0m and 8.0m; the city gate tunnels (width×height) are 6.2m×7.8m, 5.1m×6.1m, 4.7m×5.6m. Due to the limitation of construction conditions, it is inevitable to excavate ...

Embodiment 2

[0045] The hydropower station for this embodiment is the same as that of Embodiment 1.

[0046] Such as Figure 5 , 6 As shown, the variable diameter excavation method of the cavern in this embodiment includes the following steps for the intersecting form of the cave axis:

[0047] Step (1), construction preparation

[0048] Step (2), construction of the small hole section

[0049] Step (3), gradual expansion and excavation construction

[0050] When excavating from a small diameter hole section to a large hole diameter section, confirm the length of the gradual change section and the camber angle of the surrounding holes, and gradually expand the excavation by using the middle cut and surrounding light blast to form a hole diameter gradual change section.

[0051] During blasting excavation, select reasonable surrounding hole expansion parameters and blasting parameters to ensure the excavation footage and reduce blasting damage to the surrounding rock; during blasting ex...

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Abstract

The invention relates to a cavern variable-diameter excavation method, comprising the following steps: construction preparation, small-diameter tunnel section construction, gradual expansion excavation construction, large-diameter tunnel section construction, and reverse gradient section construction. The scheme of the invention is more reasonable and relatively guarantees the safety of cavern construction.

Description

technical field [0001] The invention relates to an excavation method, in particular to a variable-diameter excavation method for a cavern, which belongs to the field of tunnel construction. Background technique [0002] At present, some hydropower station irrigation areas involve many provinces, cities and counties, and the terrain is complex. The development tasks of the irrigation areas are mainly irrigation, and both urban and rural life and industrial water supply are taken into consideration. Due to the limitation of construction conditions, it is inevitable to excavate small holes radially to large holes. [0003] At the present stage, the variable-diameter excavation of the cavern is unified from the excavation of the large hole to the small diameter, and the direct full-section entry of the bolt lock or the pilot hole is constructed in the way of expanding excavation. The radial excavation of the small hole and the large hole diameter once used direct corner hole ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/01E21D20/00E21D11/10F42D3/00
CPCE21D9/00E21D9/01E21D9/006E21D20/00E21D11/105
Inventor 李猛蒲建金肖九庚许珍蒋献礼
Owner SINOHYDRO ENG BUREAU 4
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