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Arch dam-arch shoulder grooving method in mountain narrow canyon

A technology of narrow valleys and spandrels, applied in excavation, construction, infrastructure engineering, etc., can solve the problems of destroying the ecological environment, wasting land resources, and high construction risks, achieving high risk, reducing ecological environment damage, and direct economic Obvious effect

Active Publication Date: 2015-02-11
CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES
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AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for excavating spandrel troughs of arch dams in high mountains and narrow valleys to solve the problems caused by conventional large-scale excavation and support of arch dams in high mountains and narrow valleys. , waste of land resources

Method used

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  • Arch dam-arch shoulder grooving method in mountain narrow canyon

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Embodiment Construction

[0015] Include the following steps:

[0016] (1) Construct a traffic tunnel that can reach the head of the dam. Through the tunnel to reach the head of the dam, the dam site area is a narrow "V"-shaped river valley. The slope is about 60°~90°;

[0017] (2) For excavation, the excavation steps shall not exceed 5m at the excavation site near the dam crest. After two steps, the excavation steps may be increased to 10m. The opening lines of adjacent steps are parallel to ensure that the drilling In the same plane, blasting parameters:

[0018] 5m ladder section, the main blasting hole is drilled by medium wind pressure down-the-hole drilling, the hole diameter is 90mm, the hole distance of the main blasting hole is 2.5m, the row spacing is 2.0m, the hole depth is 5.0m, the charge length is 2.5m, continuous charge, the main blasting hole The plugging length is 2.5m, the detonating cord and non-electric millisecond detonating detonator are used in the detonating network, and the ...

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Abstract

The invention relates to an arch dam-arch shoulder grooving method in a mountain narrow canyon, and belongs to the arch dam-arch shoulder excavation method of the mountain narrow canyon. The method comprises the steps of grooving and excavating from a traffic hole along an arch shoulder; and supporting at once after excavating a bench to prevent the falling of the upper part and ensure the work face safety of excavating, deslagging and supporting of the lower part, wherein a vertical lifter is used for deslagging to improve efficiency. Compared with the traditional large excavating scheme, the method has the advantages of greatly reducing the excavating amount, the supporting work amount of high-edge slopes, slag amount and occupation of soil source, lowering the construction difficulty of excavating and supporting, increasing the safety guarantee in the construction period, furthest reducing the effect on the ecological environment, and being obvious in economic benefits, great in indirect benefits and huge in social benefits.

Description

technical field [0001] The invention belongs to an excavation method for a spandrel of an arch dam in a high mountain and a narrow valley. Background technique [0002] 80% of narrow valleys are located in sedimentary rock areas such as limestone, dolomite, and sand shale, and 60% of narrow valley arch dams are built in narrow valleys of limestone and dolomite. The bank slope of narrow valley arch dams is generally very steep, and the valley is completely V-shaped. Generally, narrow valleys are eroded, and the bank slope of narrow valleys is often 70-80°, or even inverted within a certain height range. The valley bottom of narrow valley arch dams sometimes forms deep grooves due to rapid erosion. Such deep canyons are often prone to unloading relaxation along the slope, large slope deformation, and even potential collapse and landslides. For steep narrow valley arch dams, the geological conditions of the slopes on both banks and the treatment of high and steep slopes on bot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/20
Inventor 马军崔忠慧陈玉夫胡志刚吕永明陈坤孝冯继军杨宏正祁世京王剑英杨玉航张喜武梁勇景健伟于生波张建辉范永李占军王晓丽徐智桓郑奕芳逄立辉夏辉刘洋金辉贾志刚牛春功吕君卓宋立民
Owner CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES
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