Excavation method of underground spherical crown type dome

A technology of spherical crown and spherical crown, which is applied in the field of excavation of underground spherical crown domes, and can solve problems such as irregular contour surface, low excavation precision, and poor molding quality

Pending Publication Date: 2021-03-30
SINOHYDRO BUREAU 6 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an excavation method for an underground spherical crown dome, which solves the problems of low excavation precision, poor molding quality, irregular contour surface, and large over- and under-excavation in the existing excavation method

Method used

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  • Excavation method of underground spherical crown type dome
  • Excavation method of underground spherical crown type dome
  • Excavation method of underground spherical crown type dome

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Embodiment Construction

[0041] In order to facilitate the description of the excavation method provided by the embodiment of the present application, the embodiment of the present application takes the tail adjustment room on the right bank of the Wudongde Hydropower Station with a maximum excavation diameter of 53 m as an example for description.

[0042] An embodiment of the present application provides an excavation method for an underground spherical dome. The excavation method includes: dividing the spherical dome from top to bottom into layers I-V; The central rock pillar area, the channel area, the circular expansion area and the surrounding protective layer; the II-V layers are all excavated by blasting in the middle step and reserving protective layers on both sides.

[0043] In order to ensure the quality and safety of the excavation, before the excavation of the underground spherical dome, it also includes:

[0044] S01: Simulate the excavation of the underground spherical crown dome by us...

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Abstract

The invention provides an excavation method of an underground spherical crown type dome. The excavation method comprises the steps of dividing the spherical crown type dome into layers I to V from topto bottom; excavating an annular pilot tunnel area, a central rock pillar area, a groove broaching area, an annular excavation expanding area and a peripheral protection layer in the layer I in sequence; and excavating the layers II to V in the mode that a middle stair section is exploded and protective layers are reserved on both sides. The dome excavation method of firstly excavating an annularpilot tunnel, reserving a central rock pillar support and annularly expanding and excavating the periphery is adopted for the layer I, the regular characteristic that the horizontal section cutting surface of a spherical body is a standard circle is fully utilized, the excavation is performed around the central axis of the dome with a circumferential and horizontal drilling method with differentradii, the purpose of round ball cutting is achieved, and the problems of excavation forming quality and surrounding rock stability of the super-large-span spherical crown type dome are solved. The method provided by the invention has the advantages of high precision, good forming quality, regular contour surface and small over and under excavation.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to an excavation method for an underground spherical dome. Background technique [0002] The tail water surge chamber of Wudongde Hydropower Station is a huge semi-cylindrical structure with an independent lower part and a connected upper part. The maximum excavated cross-sectional area of ​​the tail water regulation chamber is 1725m 2 , with a total excavation height of 113.5m and a maximum excavation diameter of 53m, it is currently the world's largest shaft group for tail adjustment chambers. [0003] as attached figure 1 As shown, the top arch of a single tailwater surge chamber is a spherical crown, the middle part is a giant semi-cylindrical well body section with an excavation diameter of 53m, and the bottom is a tailwater branch pipe section. The spherical crown-shaped dome on the top of the tail adjustment room makes it difficult to control the quality of ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D13/02
CPCE21D13/00
Inventor 任长春聂文俊叶明何金星王洪松
Owner SINOHYDRO BUREAU 6 CO LTD
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