Construction method of shotcrete support for water contained loess geological tunnel
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A technology of shotcrete and construction method, which is applied in underground chambers, earthwork drilling, shaft equipment, etc., to achieve the effects of preventing overall subsidence, ensuring durability, and improving compactness
Active Publication Date: 2012-06-27
MUNICIPAL ENVIRONMENTAL PROTECTION ENG CO LTD OF CREC SHANGHAI GRP +1
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[0004] The purpose of the present invention is to solve the problems of controlling the subsidence of the initial support vault, preventing loess collapse caused by disturbing the loess when the anchor rod is ins...
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[0031] A. Carry out the pipe shed construction step on the said cave body, install a steel arch frame under the pipe shed position after construction, drill a number of pipe shed pipe holes at the pipe shed position, and punch a number of pipe shed pipe holes on the pipe shed pipe wall in advance. Small holes, and the pipe shed pipe filled with water-absorbing agent is inserted into the pipe hole, and the end of the pipe shed pipe is welded with the steel arch frame. For each construction of 5-9 steel arch frames, a group of pipe shed pipes is constructed. Form the upper arch excavation temporary support stress system;
[0032] The pipe shed method or the umbrella arch method is a super-strong support structure for shallow buried underground excavation in underground structural engineering. Its essence is to pre-drill holes and install thick-walled steel pipes with large moments of inertia on the buried arc of the lining arch ring of the underground tunnel to be excavated or s...
Embodiment 2
[0051] Embodiment two, such as Figure 1~4 Shown:
[0052] I. The excavation of the upper arc-shaped pilot pit is generally 0.5m, and the initial support of the arch should be constructed in time;
[0053] II. The arch is hung with steel mesh, the steel arch frame is erected, and the concrete is first sprayed;
[0054] III. Excavate the core soil, install the system anchor rod, and spray the concrete twice to the standard;
[0055] IV. Waist excavation (excavation at the left and right vaults, length 2-3m);
[0056] V. The waist arch wall is hung with steel mesh, the steel arch frame is erected, and the anchor is shotcrete;
[0057] VI. Inverted arch excavation (excavation at the left and right vaults, length 2-3m);
[0058] VII. The inverted arch is hung with steel mesh, the steel arch frame is erected, and the concrete is sprayed;
[0060] IX. The secondary concrete molded lining of the arch wall.
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Abstract
The invention relates to an underground structure construction method, particularly to a construction method of a shotcrete support for a water contained loess geological tunnel, which includes a tunnel body structure, a pipe shed construction step, an advanced small conduit construction step, a foot-locked anchor pipe construction step and a systematic anchor rod construction step, wherein the tunnel body is divided into an upper part arch body, a middle part core rock and a lower part inverted arch body during the construction, so as to partially reduce the water content in the loess, establish primary support stress system in the tunnel and pre-open an anchor rod hole; the pipe shed slip casting is replaced by pre-filled water absorber, so as to absorb partial phreatic water in the water contained loess, improve the self-stabilizing performance of the loess, and improve the stability of the surrounding rock; and as the pre-opened anchor hole can be used for precisely mounting the anchor rod, the stress system of the shotcrete primary support excavated in the tunnel is more reasonable, the loess arching effect is expanded, cement mortar is compressed along the steel arch timbering behind the shotcrete of the primary support so as to improve the compactness between the structure and the surrounding rock, the stress of the reinforced concrete primary support structure system becomes more reasonable, and the integral stability is improved.
Description
[technical field] [0001] The invention relates to a construction method of an underground structure, in particular to a construction method of sprayed concrete support for a water-bearing loess geological chamber. [Background technique] [0002] At present, the construction of geological chambers with water-bearing weak and broken surrounding rocks generally adopts the construction method of pipe shed pre-grouting, anchor rods, and steel arches combined with initial support construction technology. However, the disadvantage of excavating tunnels in water-bearing loess soil is that the pre-grouting of the pipe shed and the construction of anchor bolts first, the two construction procedures will destroy the original water-bearing loess structure, and the excavation surface will be exposed for a long time. The loess with vertical joints is disturbed and cut, which seriously reduces the self-stabilization ability of the loess on the excavation surface of the loess tunnel. In ad...
Claims
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IPC IPC(8): E21D11/10E21D20/00
Inventor 吴占东王勇林云
Owner MUNICIPAL ENVIRONMENTAL PROTECTION ENG CO LTD OF CREC SHANGHAI GRP
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