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Construction method for rock anchorage beam of underground workshop

A technology for underground workshops and construction methods, which is applied in excavation, infrastructure engineering, sheet pile walls, etc., can solve the problems of unsatisfactory repair effect, reducing the bearing capacity of rock anchor beams, affecting the anchoring of rock anchor beams and surrounding rock, etc.

Inactive Publication Date: 2010-06-23
湖北白莲河抽水蓄能有限公司
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Problems solved by technology

[0006] But carry out the rock anchor beam of underground powerhouse construction with above-mentioned conventional method, rock anchor beam all can appear more or less crack, affects the anchorage between rock anchor beam and surrounding rock, thereby has reduced the bearing capacity of rock anchor beam, and rock anchor beam After the cracks in the beam, the repair effect is very unsatisfactory

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  • Construction method for rock anchorage beam of underground workshop
  • Construction method for rock anchorage beam of underground workshop
  • Construction method for rock anchorage beam of underground workshop

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Embodiment Construction

[0019] The construction method of the rock anchor beam for the underground powerhouse provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] As shown in the accompanying drawings, the excavation depth of the underground powerhouse is generally about 50m, and the excavation is carried out in layers. In this embodiment, the actual construction exceeds four floors. The specific construction process is as follows:

[0021] (1) Construction of the first floor (arch part) of the underground powerhouse

[0022] The excavation of the first floor of the underground powerhouse generally adopts the method of excavating the middle pilot tunnel I 1 and expanding the excavation I 2 on both sides.

[0023] (2) Construction of the second floor of the underground workshop

[0024] The second floor of the underground powerhouse is usually excavated in four parts. The part above the rock anchor beam is II 3, the protective lay...

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Abstract

The invention provides a construction method for a rock anchorage beam of an underground workshop. The method at least comprises the following steps: firstly, finishing the construction of an I layer of the underground workshop, namely an arch part; finishing the construction of a II layer; then the construction of a III layer; performing pre-splitting construction on two side walls of a IV layer; after the pre-splitting construction is finished, finishing the construction of a permanent support anchor rod; after a pre-splitting hole is excavated at the side wall of the IV layer, performing the construction of a rock anchorage beam bearing anchor rod, then casting a concrete beam body in the bearing anchor rod, and curing the concrete surface; and after protecting the concrete surface of the rock anchorage beam, performing the construction of the IV layer, wherein the IV layer construction is finished by means of forming a water groove in the middle, reserving protective layers at two sides, bench-blasting the middle part and smooth-blasting the two sides. Moreover, the used concrete is the concrete containing polypropylene fiber. The method is optimized based on the existing construction method for the rock anchorage beam, and can fully prevent the rock anchorage beam from cracking.

Description

[0001] the field [0002] The invention relates to a construction method for a rock anchor beam of an underground powerhouse, and belongs to the technical field of water conservancy project construction. Background technique [0003] The rock anchor beam is the abbreviation of the rock wall crane beam. The reinforced concrete beam body is firmly fixed on the rock by using a certain depth of grouting long anchor rod. The load it bears is transmitted to the rock mass through the long anchor rod and the friction force of the rock wall. . Compared with ordinary cast-in-place beams, it does not set up columns and makes full use of the support of the surrounding rock wall. Rock anchor beams are mainly used in the supporting system of walking lifting equipment such as the installation and maintenance of electromechanical equipment in underground powerhouses of hydropower stations. Compared with rock platform beams and other structural beams, it can narrow the span of underground po...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D5/74C04B16/06
Inventor 唐健胡代清王建平
Owner 湖北白莲河抽水蓄能有限公司
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