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Construction method of ahead mini type composite soil nail wall support

A construction method and composite soil nailing technology, applied in sheet pile walls, excavation, foundation structure engineering, etc., can solve the problems of increasing slope support cost and construction difficulty, tense working face, small grading coefficient, etc., to avoid Temporary relocation or demolition, occupying a small part of the ground, and the effect of fast project progress

Inactive Publication Date: 2012-07-11
CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
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Problems solved by technology

[0002] At present, in the construction of urban construction projects, it is inevitable to excavate foundation trenches (pit) near the ground buildings (structures), often due to the small distance between the existing buildings (structures) on the ground and the edge of the foundation pit, resulting in During the excavation of the foundation pit, the slope coefficient is small, the working face is tense, and more importantly, the cost and construction difficulty of slope support are increased. What kind of construction method can be used to complete the construction at the most economical and reasonable cost and ensure The safety of foundation pit excavation has become a concern of some relevant construction units and construction units

Method used

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Embodiment

[0027] Embodiment: The advanced miniature pile composite soil nailing wall support construction method of the present invention includes the following construction steps: measuring and setting out, manually excavating the work surface, trimming the side slope→constructing miniature piles, earthwork excavation, trimming the side slope, and constructing Soil nailing (anchor), laying, fixing steel mesh, sprayed concrete surface (waist beam installation), and cyclic construction to the design base elevation.

[0028] 1) Construction of pre-supported micro-piles: Clean up impurities and floating soil around the slope, and construct a row of pre-supported micro-piles at a position 0.5m below the natural ground on the slope; the distance between the micro-piles and the outer edge of the upper excavation of the foundation pit is 0.3m, and the pile diameter is 150mm , the pile length is 10.00m~14.0m, the horizontal spacing is 0.75m, and the center of the pile is equipped with Φ68 steel ...

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Abstract

The invention discloses a construction method of an ahead mini type composite soil nail wall support, comprising the following steps of: measuring and paying off, artificially digging a working face, finishing a side slope and constructing a mini type pile, carrying out earth excavation, finishing the side slope, constructing a soil nail (an anchor rod), paving, fixing a reinforcing mesh, spraying a concrete surface layer (installing a waist rail), and circularly constructing until to a designed base level. Support is carried out by the means that the pressure of a side slope soil body is jointly carried by two support modes of a pre-support mini type pile and a soil nail wall. The method is convenient to construct, the construction cost is within the range between a slop protecting pile and the soil nail wall, the construction method has good effects that the displacement deformation of the edge slope can be controlled, the whole stability can be enhanced, the local collapse can be avoided when the edge slope is dug and the like, and the safety stability of the edge slope is greatly improved according to the method. Compared with the normal soil nail wall and slope protecting pile, the construction method has incomparable advantages.

Description

technical field [0001] The invention relates to a construction method for the support of an advanced micro pile composite soil nail wall. Background technique [0002] At present, in the construction of urban construction projects, it is inevitable to excavate foundation trenches (pit) near the ground buildings (structures), often due to the small distance between the existing buildings (structures) on the ground and the edge of the foundation pit, resulting in During the excavation of the foundation pit, the slope coefficient is small, the working face is tense, and more importantly, the cost and construction difficulty of slope support are increased. What kind of construction method can be used to complete the construction at the most economical and reasonable cost and ensure The safety of foundation pit excavation has become a concern of some relevant construction units and construction units. the Contents of the invention [0003] The purpose of the present invention...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D5/76
Inventor 焦安亮周申彬赵刚黄延铮吴耀清闫亚召
Owner CHINA CONSTR SEVENTH ENG DIVISION CORP LTD
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