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Construction method of water stopping surrounding and protecting structure of soft soil foundation building foundation pit

A technology for soft soil foundation and enclosure structure, which can be applied in basic structure engineering, construction, etc., can solve the problem of no water-stop curtain structure, etc., and achieve the effect of rapid and convenient construction process, shortened construction period and reduced construction cost.

Active Publication Date: 2014-06-18
黄吉永
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since cement mixing piles or high-pressure jet grouting piles can hardly be constructed on such sites, there is no suitable water-stop curtain structure for building foundation pits on this type of soft soil foundation

Method used

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  • Construction method of water stopping surrounding and protecting structure of soft soil foundation building foundation pit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment one: a kind of construction method of the water-stop enclosure structure of soft soil foundation building foundation pit, comprises the following steps:

[0019] Set a gravel layer 1 with a thickness h of 6m on the soft soil foundation where the foundation pit needs to be constructed.

[0020] Around the edge of the foundation pit to be constructed, excavate an inverted trapezoidal groove from the surface of the gravel layer 1 until the depth of the trench reaches the low-permeability clay layer 2, and the bottom of the trench reaches the gravel layer The vertical distance d of the bottom of 1 is 0.5m, and the slope angle of the side wall of the trench is 45°.

[0021] Fill the trench with homogeneous clay to form a clay water-stop curtain 3 .

[0022] The foundation pit retaining wall 4 is installed in the clay water-stop curtain 3, the inside and outside of the foundation pit retaining wall 4 are compacted and fixed by homogeneous clay, and the hor...

Embodiment 2

[0024] Embodiment 2: the rest is the same as Embodiment 1, the difference is that the thickness h of the gravel layer 1 is 2m, the vertical distance d from the bottom of the trench to the bottom of the gravel layer 1 is 1.0m, and the side of the trench is The slope angle of the wall is 75°, and the horizontal distance s from the outside of the foundation pit retaining wall 4 to the bottom outside of the trench is 1.1m. cast-in-place pile composition.

Embodiment 3

[0025] Embodiment 3: the rest is the same as Embodiment 1, the difference is that the thickness h of the gravel layer 1 is 4m, the vertical distance d from the bottom of the trench to the bottom of the gravel layer 1 is 0.7m, and the side of the trench is The slope angle of the wall is 60°, the horizontal distance s from the outside of the foundation pit retaining wall 4 to the bottom outside of the trench is 0.6m, and the foundation pit retaining wall 4 is composed of a plurality of steel sheet piles arranged around the edge of the foundation pit to be constructed .

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Abstract

The invention discloses a construction method of a water stopping surrounding and protecting structure of a soft soil foundation building foundation pit. The construction method is characterized by comprising the following steps that a rock ballast layer is arranged on the soft foundation of the foundation pit to be constructed; a groove is downwards dug from the surface of the rock ballast layer around the foundation pit to be constructed until the depth of the dug groove reaches a low-permeability clay layer; homogeneous clay is filled into the groove for forming a clay water stopping curtain; a foundation pit blocking wall is arranged in the clay water stopping curtain, and the inner side and the outer side of the foundation pit blocking wall are respectively compacted and fixed by the homogeneous clay; a horizontal supporter is arranged in the foundation pit surrounded by the foundation pit blocking wall, and the construction of the water stopping surrounding and protecting structure is completed. The method has the advantages that the depth of the groove reaches the low-permeability clay layer, the good water stopping effect of the clay water stopping curtain is ensured, the maintenance work procedure of the clay water stopping curtain after the construction is not needed, the water stopping effect can be immediately realized after the construction completion, the construction process is fast and convenient, the construction work period is greatly shortened, the homogeneous clay can be locally dug in near places, and the construction cost is reduced.

Description

technical field [0001] The invention relates to a construction method for a foundation pit enclosure structure, in particular to a construction method for a water-stop enclosure structure for a foundation pit of a soft ground foundation building. Background technique [0002] At present, in the earthwork excavation of building foundation pits, cement mixing piles or high-pressure jet grouting piles are generally used to form a continuous wall around the edge of the foundation pit as a water-stop curtain. The cement mixing piles or high-pressure jet jetting piles start from the ground. Go down into the low-permeability clay layer under the foundation pit to form an impermeable space inside the foundation pit. [0003] The basic construction conditions of cement mixing piles or high-pressure rotary grouting piles are that the site is flat, the soil is uniform, and the hardness is moderate. It cannot be constructed on gravel layers with debris such as large stones; The constru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/18
Inventor 黄吉永郑荣跃黄楠严远飞章孟能徐俊宇毛建波郎韬怀朱森祥
Owner 黄吉永
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