Construction method for assisting in sinking of open caisson through high-pressure water

Abstract

The invention relates to a construction method for assisting in sinking of an open caisson through high-pressure water. The construction method includes the steps that firstly, when the caisson wall of the open caisson is manufactured, steel pipes are pre-arranged on the two sides of the caisson wall and evenly arranged along the caisson wall in the form of extending to blade feet from top to bottom; secondly, if sinking is resisted, high-pressure water is pressed into the upper end openings of all the steel pipes through a high-pressure water pump to destroy the soil mass on the inner sides and the outer sides of the blade feet of the open caisson, and the sinking resistance is reduced; and thirdly, whether the open caisson sinks in place or not is checked, if not, the second step is executed till the open caisson sinks in place. According to the construction method assisting in sinking of the open caisson through high-pressure water, the high-pressure water sinking assists in sinking of the two sides of the blade feet, and the construction efficiency of traditional water-assisting sinking is improved.

Description

technical field

[0001] The invention relates to a caisson construction method, in particular to a caisson construction method suitable for relatively hard formations. Background technique

[0002] The caisson has many advantages such as high rigidity, high bearing capacity and strong anti-seepage ability, making it one of the most important construction methods for large-scale underground structures and deep foundations in cities. Of course, there are still some difficult technical problems in caisson construction. For example, when sandy soil, sandy gravel layer or sandy pebble layer is encountered during the subsidence process, it is often difficult for the caisson to continue to sink. At present, the measures for caisson assisted sinking mainly include water jet sinking method, thixotropic Mud retaining wall sinking method, weight sinking method, etc. The currently used caisson jetting sinking method still has the problem of low sinking efficiency, which will delay the ...

Examples

Embodiment Construction

[0015] Below in conjunction with specific embodiment, further illustrate the present invention.

[0016] Such as figure 1 Shown, a kind of caisson high-pressure water-assisted construction method comprises the following steps:

[0017] ① When making the caisson well wall, install steel pipes on both sides of the well wall in advance. The steel pipes should be evenly installed along the well wall and should extend from top to bottom to the edge of the blade;

[0018] ②If the sinking is blocked, press high-pressure water into the steel pipe through the high-pressure water pump at the upper port of each steel pipe to destroy the soil inside and outside the caisson blade foot, and reduce the sinking resistance;

[0019] ③ Check whether the caisson is sunk in place, if not, return to step ② until the caisson sinks in place.

[0020] The diameter of the steel pipe used is 40mm-120mm, and the water outlet of the steel pipe is 100mm-300mm away from the bottom end of the blade foot. ...

technical field

[0001] The invention relates to a caisson construction method, in particular to a caisson construction method suitable for relatively hard formations. Background technique

[0002] The caisson has many advantages such as high rigidity, high bearing capacity and strong anti-seepage ability, making it one of the most important construction methods for large-scale underground structures and deep foundations in cities. Of course, there are still some difficult technical problems in caisson construction. For example, when sandy soil, sandy gravel layer or sandy pebble layer is encountered during the subsidence process, it is often difficult for the caisson to continue to sink. At present, the measures for caisson assisted sinking mainly include water jet sinking method, thixotropic Mud retaining wall sinking method, weight sinking method, etc. The currently used caisson jetting sinking method still has the problem of low sinking efficiency, which will delay the ...

Examples

Embodiment Construction

[0015] Below in conjunction with specific embodiment, further illustrate the present invention.

[0016] Such as figure 1 Shown, a kind of caisson high-pressure water-assisted construction method comprises the following steps:

[0017] ① When making the caisson well wall, install steel pipes on both sides of the well wall in advance. The steel pipes should be evenly installed along the well wall and should extend from top to bottom to the edge of the blade;

[0018] ②If the sinking is blocked, press high-pressure water into the steel pipe through the high-pressure water pump at the upper port of each steel pipe to destroy the soil inside and outside the caisson blade foot, and reduce the sinking resistance;

[0019] ③ Check whether the caisson is sunk in place, if not, return to step ② until the caisson sinks in place.

[0020] The diameter of the steel pipe used is 40mm-120mm, and the water outlet of the steel pipe is 100mm-300mm away from the bottom end of the blade foot. ...

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