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Construction method for supporting foundation ditch of reinforced cement earth wall

A technology for cement-soil wall and foundation pit support, which is used in earth-moving drilling, infrastructure engineering, drilling equipment and methods, etc., can solve the problems of poor lateral resistance of cement-soil walls, etc. performance, guaranteed reliability, high water-stop effect

Inactive Publication Date: 2010-01-20
朱奎
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AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a construction method for foundation pit support of reinforced cement-soil walls to solve the problem of poor lateral resistance of cement-soil walls

Method used

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  • Construction method for supporting foundation ditch of reinforced cement earth wall
  • Construction method for supporting foundation ditch of reinforced cement earth wall
  • Construction method for supporting foundation ditch of reinforced cement earth wall

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Embodiment Construction

[0029] Project Overview

[0030] A commercial building project consists of a 6-storey shopping mall above ground, a 2-storey garage and a shopping mall underground, with a construction area of ​​32,000m 2 , The total length of the building is 231m, the width is 25m, and the excavation depth of the foundation pit is 5.5-6m. The construction site is relatively narrow, the surrounding environmental conditions are complex, and there are many pipelines around the foundation pit.

[0031] Construction steps include:

[0032] (1) Cement and earth wall construction

[0033] Cement and soil piles are sprayed three times, the first spraying volume is controlled at 50%; the second spraying volume is controlled at 30%, the third spraying volume is controlled at 20%, and the third spraying volume is only in the upper 1 / 3 parts. Since the upper 1 / 3 of the mixing pile is heavily loaded, the strength of the upper part of the mixing pile is strengthened to meet the load requirements.

[...

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Abstract

The invention discloses a construction method for supporting a foundation ditch of a reinforced cement earth wall, which is characterized in that reinforced concrete and an improved prestress anchor rod act together and are used as a foundation ditch supporting system, moso bamboo slices are inserted into cement earth, the tensile force is transferred to a good soil layer through the prestress anchor rod, and the stress performance of the prestress anchor rod is improved by enlarging the anchor head in an anchored region, and the enlarged head anchor rod construction adopts a hydraulic power expanding method. The construction method comprises the following steps: firstly, determining the thickness of a reinforced cement earth wall; secondly constructing the cement earth wall; thirdly, inserting the moso bamboo slices; fourthly, drilling an anchor rod hole with a sleeve; fifthly, expanding the hole by water power; sixthly, expanding and slip-casting; seventhly, inserting the anchor rod; eighthly, slip-casting; ninthly, casting a top beam; and tenthly, tensioning the anchor rod. The invention has the characteristics of high watertight performance and good permeability resistance.

Description

technical field [0001] The invention relates to the construction field, in particular to a construction method for foundation pit support of reinforced cement-soil walls. Background technique [0002] The cement-soil anti-seepage effect is better, and the water-retaining effect of the cement-soil wall is ideal. However, the lateral resistance of the cement-soil wall is poor, and relying solely on the cement-soil wall as foundation pit support cannot effectively resist tension. Therefore, in the foundation pit support system, cement mixing piles generally cannot be used alone, and need to be used in combination with bored piles. Seepage curtain, while bored piles take on the role of soil retaining on the slope. Although this enclosure method has a clear division of labor and can effectively increase the length of the seepage path, the effect of retaining soil and water is more reasonable. However, two types of piles, cement mixing pile and bored pile, are used at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D5/20E02D5/76E21B7/28E21B3/00
Inventor 朱奎
Owner 朱奎
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