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Adverse slope excavating construction method of large-section tunnel in water-rich tunnel section

A construction method and large-section technology, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as poor construction conditions, increased excavation operation time, and potential safety hazards of construction personnel and equipment, so as to improve construction efficiency, The construction sequence is reasonable and the effect of improving the construction environment

Active Publication Date: 2013-07-24
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

[0002] Underground engineering is excavated against the slope in the section of the underground water gushing tunnel, which not only poses safety hazards for construction personnel and equipment, but also due to the impact of groundwater on the excavation face, the efficiency of drilling, charging, slag extraction and blasting at the bottom of the tunnel is greatly reduced , thus increasing the excavation time, and the construction conditions are also relatively harsh

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  • Adverse slope excavating construction method of large-section tunnel in water-rich tunnel section
  • Adverse slope excavating construction method of large-section tunnel in water-rich tunnel section
  • Adverse slope excavating construction method of large-section tunnel in water-rich tunnel section

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Embodiment Construction

[0018] Figure 1 ~ Figure 3 An embodiment of the construction method for excavating the reverse slope of the large-section tunnel in the rich water tunnel section of the present invention is shown, and the specific construction steps are as follows:

[0019] a. Firstly excavate the tunnel at a position higher than the design floor elevation 11 of the tunnel to form an upper step excavation section 1 . (At this time, the excavation face of the tunnel has not yet entered Fushui Tunnel Section 4)

[0020] b. Before the excavation face enters the water-rich tunnel section 4, the tunnel is excavated according to the longitudinal slope with a slope ratio of less than 10% downhill to form the upper step downhill tunnel section 2, and the end of the upper step downhill tunnel section 2 is connected to the The tunnel design floor elevation is 11 level. That is, the upper step excavation tunnel section 1 descends the slope to the tunnel design floor elevation 11 through the upper step...

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Abstract

The invention relates to an adverse slope excavating construction method of a large-section tunnel in a water-rich tunnel section, and aims at providing a construction method capable of orderly and automatically discharging underground gushing water. The technical scheme of the invention comprises the steps of: a, firstly, carrying out top step excavation to form a top step excavating hole section; b, carrying out low slope excavation to form a top step sloping hole section; c, setting a ponding bin; d, installing a water pump and a pumping pipe in the ponding bin; e, carrying out top step excavation on a water-rich hole section according to a temporary positive slope; and f, carrying out bottom step bottom excavation according to the reverse direction of a designed longitudinal slope of a tunnel after the top step excavation of the water-rich hole section is completed and a bottom excavated working face at the downstream side of the tunnel runs through. The invention is suitable for construction of underground projects such as water conservancy and hydropower projects, traffics, mines and the like in an underground gushing water-rich hole section.

Description

technical field [0001] The invention relates to a reverse-slope construction method for excavating large-section tunnels in water-rich tunnel sections, which is suitable for the construction of water conservancy and hydropower, transportation, mining and other underground projects in underground water-rich tunnel sections. Background technique [0002] Underground engineering is excavated against the slope in the section of the underground water gushing tunnel, which not only poses safety hazards for construction personnel and equipment, but also due to the impact of groundwater on the excavation face, the efficiency of drilling, charging, slag extraction and blasting at the bottom of the tunnel is greatly reduced , thus increasing the excavation operation time, and the construction conditions are also relatively harsh. Contents of the invention [0003] The technical problem to be solved by the present invention is: to provide a large-section tunnel excavation reverse slo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00
Inventor 夏泽勇李军周垂一侯靖陈祥荣杨萍刘伯全
Owner POWERCHINA HUADONG ENG COPORATION LTD
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