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Excavation construction method for rock-bolted crane beam part of underground powerhouse in pumped storage power station

A technology for pumped storage power stations and underground powerhouses, which is applied in hydroelectric power stations, excavation, and hydroelectric power generation. It can solve problems such as difficult control of over- and under-excavation, high safety risks, and large impact of blasting vibration on surrounding rocks.

Inactive Publication Date: 2017-12-29
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Controlled blasting technology is adopted in the excavation of traditional rock wall crane beams. Smooth blasting or pre-splitting blasting is usually used for the rock platform of rock wall crane beams. A large number of productive blasting tests are required to determine the optimal blasting parameters. There are many disadvantages, such as cumbersome construction, high safety risks, and great impact of blasting vibration on surrounding rock, especially under complex geological conditions, it is difficult to control over- and under-excavation, and the quality of rock platform formation is poor

Method used

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  • Excavation construction method for rock-bolted crane beam part of underground powerhouse in pumped storage power station
  • Excavation construction method for rock-bolted crane beam part of underground powerhouse in pumped storage power station
  • Excavation construction method for rock-bolted crane beam part of underground powerhouse in pumped storage power station

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Embodiment Construction

[0033] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein.

[0034] Such as Figure 1~5 As shown, the underground powerhouse of the pumped storage power station is excavated to the layer where the crane beam on the rock wall is located, and the excavation construction method procedure of the present invention is as follows:

[0035] 1) Down-the-hole drilling and pre-splitting blasting are carried out on the upper and downstream side walls of the plant to form a pre-splitting surface 7 to reduce damage to the side walls of the underground plant during the blasting of the excavation zone I, II zone 2, and III zone 3. vibration effects.

[0036] 2) Carry out blasting excavation in Excavatio...

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Abstract

The invention discloses an excavation construction method for a rock-bolted crane beam part of an underground powerhouse in a pumped storage power station. A layer where a rock-bolted crane beam is located is divided into four excavation areas, the excavation area I is located at the middle part of the layer, and the excavation area II, the excavation area III and the excavation area IV are symmetrically arranged along the longitudinal axis of the powerhouse. The excavation construction method achieves the effects of simplifying construction procedures, lowering the safety risk, improving the excavation quality, and reducing disturbance on surrounding rock and the cast concrete.

Description

technical field [0001] The invention relates to a construction method for excavating a rock wall crane beam part of an underground powerhouse of a pumped-storage power station, in particular to a method combining rock cutting and traditional blasting technology. Background technique [0002] In the underground workshop of the pumped storage power station, the rock wall crane girder is a reinforced concrete beam with a track and a walking crane on it, which is an important load-bearing structure. The rock wall beam uses a certain depth of grouted long anchor to firmly anchor the reinforced concrete beam body on the surrounding rock, and the load it bears is transmitted to the surrounding rock through the friction between the long anchor and the rock platform. If the rock is destroyed, the bearing capacity of the rock wall beam will be affected. The quality of its excavation and forming is very critical, and it is one of the parts with the highest quality requirements in the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B9/00E02D29/045E02D17/02E02F5/30
CPCE02B9/00E02D17/02E02D29/04E02F5/30Y02E10/20
Inventor 高峰蒋海云徐伟徐剑飞梁睿斌
Owner STATE GRID CORP OF CHINA