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Deep narrow river valley super deep foundation pit muddy excavation road construction slope protection structure and method

A technology of road construction and construction method, which is applied in the direction of infrastructure engineering, roads, excavation, etc., can solve the problems of high construction cost and long construction period, so as to ensure anti-sliding stability, ensure bearing capacity, and ensure firm Effect

Inactive Publication Date: 2019-08-30
CHINA GEZHOUBA (GRP) FIRST ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the construction cost of this scheme is very high, and the comprehensive construction period still takes a long time

Method used

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  • Deep narrow river valley super deep foundation pit muddy excavation road construction slope protection structure and method
  • Deep narrow river valley super deep foundation pit muddy excavation road construction slope protection structure and method
  • Deep narrow river valley super deep foundation pit muddy excavation road construction slope protection structure and method

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Experimental program
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Effect test

Embodiment 1

[0032] Such as Figure 1~3 Among them, a muddy excavation road construction slope protection structure for ultra-deep foundation pits in deep and narrow valleys, a gravel cushion 5 is arranged below the road surface 4, preferably, the thickness of the gravel cushion 5 is 1.5m~2m, A concrete drain 3 is provided on the side of the road surface 4 near the top of the slope, and a plurality of stacked steel gabions 6 are provided on the side of the road surface 4 near the bottom of the slope. The steel gabion 6 is a cage body welded by steel bars, and the cage body is filled with block stones.

[0033] In a preferred solution, a gravel revetment 2 is provided on the outside of the road surface 4 near the top of the slope, and the thickness of the gravel revetment 2 is 1 m. In a preferred solution, a geotextile 9 is also provided below the gravel slope protection 2 and the gravel cushion 5 . The geotextile 9 here is a geomembrane with a waterproof effect and a certain bearing capa...

Embodiment 2

[0039] Such as Figure 1~3 Among them, a construction method using the above-mentioned deep and narrow valley ultra-deep foundation pit silt excavation road construction slope protection structure, comprising the following steps:

[0040] S1. Laying the gravel cushion 5; the laying thickness of the gravel cushion 5 is 1.5m~2m.

[0041] S2. Set excavation drainage ditch on one side of road surface 4. The bottom of the drainage ditch should be lower than the bottom of the proposed construction road surface 4. The drainage ditch is connected to the water collection well located at the lowest position in the foundation pit, and the water collection well is connected to the pump room for continuous drainage ;

[0042] After drainage makes the base reach sufficient bearing capacity, the concrete drainage ditch 3 is erected; the bottom of the concrete drainage ditch 3 is lower than the bottom of the road surface 4 to be laid, so as to continue to assist the drainage of the base.

...

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Abstract

The invention provides a deep narrow river valley super deep foundation pit muddy excavation road construction slope protection structure and method. A rock ballast pad layer is arranged below the road face, a concrete drainage ditch is arranged on the side, close to the slope top, of the road face, and multiple stacked reinforcing steel bar gabions are arranged on the side, close to the slope bottom, of the road face. The construction method comprises the steps of laying the rock ballast pad layer; arranging the drainage ditch on one side of the road face, enabling the bottom of the drainageditch to be lower than the bottom of the road face planned to be constructed, and connecting the drainage pitch with a water collection well in the foundation pit; arranging the stacked reinforcing steel bar gabions on one side, close to the slope foot, of the road face, and wrapping the outer sides of the reinforcing steel bar gabions through a geomembrane to serve as mold plate; pouring concreteinto the reinforcing steel bar gabions in a layered manner; after initial setting, constructing the road face in a construction manner of grinding concrete; and through the above steps, achieving super deep foundation pit muddy excavation road construction. The problem of construction of a deep thick covering layer clayey silt layer in the prior art is solved, the road face bearing force is ensured, the slope structure firmness is ensured, and the anti-sliding stability is ensured.

Description

technical field [0001] The invention relates to the field of foundation pit construction of water conservancy and hydropower projects, in particular to a slope protection structure and method for construction of muddy excavation roads in ultra-deep foundation pits in deep and narrow valleys. Background technique [0002] During the construction of a super-high concrete face dam hydropower station in a narrow canyon with deep silt and thick overburden, foundation pit excavation is required. The geological conditions of the construction location are: the valley at the dam site is narrow, and the shape of the valley is a relatively symmetrical "V" valley. Difficult to arrange. The riverbed cover layer in the dam site area includes clayey silt, the maximum thickness of the entire cover layer exceeds 85 meters, and part of the cover layer has poor uniformity, so it is comprehensively judged to be vibrated liquefied sandy soil. The bearing capacity is low, the anti-deformation ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D19/08E01C3/04
CPCE01C3/04E02D17/205E02D19/08
Inventor 郑正勤柏元武费波涛李家富张旭罗磊李红心曾刚蒋艳胡艺川
Owner CHINA GEZHOUBA (GRP) FIRST ENG CO LTD
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