Sinking construction method for open caisson in geological sludge layer under saturated water condition

A construction method and silt layer technology are applied in the field of caisson subsidence construction to achieve the effect of ensuring normal use

Active Publication Date: 2012-07-18
SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned problems existing in the sinking construction process of the existing caissons, and to provide a method of sinking the caissons with cement powder jetting piles to solve the problem of silt layer under the condition of saturated water

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  • Sinking construction method for open caisson in geological sludge layer under saturated water condition
  • Sinking construction method for open caisson in geological sludge layer under saturated water condition
  • Sinking construction method for open caisson in geological sludge layer under saturated water condition

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example

[0033] A caisson in a circular inlet pump house has a diameter of 20m, a wall thickness of 800mm, and an inner partition wall of 800mm to divide the caisson into two sections. The height of the caisson is 11.0m, and its weight is about 14300kN. The geology of the area where the project is located is silty soil layer, the thickness of the silt layer is relatively large, the maximum thickness reaches 15m, the groundwater is relatively rich, and the water content of the silt is greater than 65%. The construction adopts the drainage and sinking under the force of gravity.

[0034] Waterproof curtain: Before the sinking of the caisson, two circles of 600mm-diameter cement powder jetting piles are arranged at 2.0m outside the well wall. The piles overlap each other by 150mm, and the pile length is 16m. The amount is 20% (percentage by weight) of the reinforced soil.

[0035]Sinking stabilizing piles: Preliminary design of sinking stabilizing piles at the blade foot: because the wall...

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Abstract

The invention aims at phenomena of sudden sinking, surging soil, over-high sinking speed, extra sinking, over-large displacement, over-large inclining and the like in the existing open caisson sinking construction process at a saturated water condition in a geological sludge layer, and provides an open caisson sinking construction method that adopts cement powder spraying piles. The method comprises three manners of arranging a waterproof curtain at the periphery of an open caisson, distributing sinking stabilizing piles at cutting edges of the open caisson and arranging a composite foundation at the bottom of the open caisson, so that the stability of inner soil body is ensured, gestures and sinking speed and depth of the open caisson are controlled accurately and the open caisson can be used normally.

Description

technical field [0001] The invention relates to a sinking construction method of a caisson, in particular to a sinking construction method of a caisson whose geology is a mud layer under saturated water conditions. Background technique [0002] A caisson is a shaft-shaped structure, which excavates soil in the well, relies on its own gravity to overcome the frictional resistance of the well wall, then sinks to the design elevation, and then seals the bottom to build the internal structure. The main structure of the caisson includes blade foot, well wall, inner partition wall, bottom cover, roof, etc., among which: the well wall is the outer wall of the caisson, which is the main part of the caisson, and it should have sufficient strength to withstand the sinking of the caisson The load acting during the process and during use; at the same time, it is also required to have enough weight so that the caisson can sink smoothly under its own weight; the blade foot is the "blade f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D23/08
Inventor 刘小勇张文彪潘春花
Owner SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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