CN209854756U

CN209854756U - Open caisson anti-overboaking and anti-gushing structure in soft soil foundation

Info

Publication number: CN209854756U
Application number: CN201920628027.3U
Authority: CN
Inventors: 罗斌; 周建英; 陈伟
Original assignee: Taizhou Urban And Rural Planning And Design Institute
Current assignee: Taizhou Urban And Rural Planning And Design Institute
Priority date: 2019-05-03
Filing date: 2019-05-03
Publication date: 2019-12-27
Anticipated expiration: 2029-05-03

Abstract

The utility model discloses a sunk well prevents that super sinking prevents gushing soil structure in soft soil foundation, the sunk well sinks to about design elevation 20cm, beats two rows of lapped high pressure jet grouting piles of mutual interlock along the wall of a well inboard of sunk well, and the quincunx is arranged high pressure jet grouting pile and is consolidated the soil body in the middle of the sunk well. The utility model has the advantages that: the high-pressure jet grouting piles are occluded to form a partition curtain, so that the soil gushing phenomenon is reduced; the high-pressure rotary spraying in the middle of the open caisson enables the fluid plastic soil to be bonded and solidified, so that the soil gushing phenomenon can be effectively eliminated, and the ground settlement caused by soil body flowing can be further reduced; the foundation bearing capacity and the friction force are increased by the rotary jet piles in the open caisson, so that the sinking speed and the elevation of the open caisson can be controlled, and the over sinking is avoided; the rotary jet piles in the open caisson lead soil bodies to be bonded and solidified, and drainage bottom sealing can be adopted, so that the construction environment of the bottom plate is improved, and the construction and waterproof quality of the bottom plate is improved.

Description

Open caisson anti-overboaking and anti-gushing structure in soft soil foundation

Technical Field

The utility model belongs to underground works structures field, concretely relates to open caisson is prevented surpassing and is prevented gushing soil structure in soft soil foundation.

Background

The open caisson is a well tubular structure, and is dug in the well, and sinks to a designed elevation after overcoming the frictional resistance of the well wall by the self gravity, and then passes through a concrete bottom sealing, and a sewage inspection well, a water pump room and the like in municipal engineering are widely applied.

The weak soil has poor mechanical property, high water content and strong fluidity, and the open caisson sinks to the vicinity of the designed elevation, so that the problems of over-sinking, soil gushing and the like are easy to occur. The foundation bearing capacity is poor, the sinking coefficient of the open caisson is large, the sinking speed is uncontrollable, the sinking speed is too high, the phenomenon of over-sinking occurs, the open caisson sinks, the difference of the internal and external pressure in the well continuously increases, finally, the soil body is damaged by sliding, the soil is flooded, the open caisson is over-sunk, the over-sinking influences the use function of the open caisson, the soil body generated by the soil flooding flows, the ground settlement is caused, the safety during construction and the safety of surrounding buildings are greatly threatened, at present, the over-sinking is avoided, the soil fetching is stopped at the open caisson about 20cm away from the designed elevation, the open caisson sinks to the designed elevation according to the dead weight, the soil in the well is flooded, the underwater bottom sealing is adopted, the above process is difficult to control the elevation of the open caisson, the difficulty of the underwater bottom sealing is.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a can effectively prevent and treat the open caisson and exceed to sink, solve the open caisson and gush soil structure, can effectively solve the control open caisson and sink to the design elevation, eliminate and gush soil, improve the open caisson back cover quality.

In order to achieve the above object, the utility model discloses a sinking well prevents that super sinking prevents gushing soil structure in soft soil foundation, including being equipped with the high pressure jet grouting pile that cuts off curtain and ground reinforcement usefulness, its structural feature is: sinking the open caisson to about 20cm from the designed elevation, constructing a row of partition curtains consisting of mutually occluded and lapped high-pressure jet grouting piles along the inner side of the well wall of the open caisson, and arranging the high-pressure jet grouting piles positioned in the middle of the partition curtains in the open caisson to serve as foundation reinforcement.

Furthermore, the middle high-pressure rotary jet grouting pile in the sinking well is arranged in a quincunx shape.

Compared with the prior art, the beneficial effects of the utility model are that:

1) two rows of high-pressure jet grouting piles on the inner side of the well wall of the open caisson are mutually occluded and lapped to form a partition curtain, which is equivalent to increase the length of the blade foot of the open caisson and reduce the phenomenon of soil gushing;

2) the high-pressure rotary spraying in the middle of the open caisson enables the fluid plastic soil to be bonded and solidified, so that the soil gushing phenomenon can be effectively eliminated, and the ground settlement caused by soil body flowing can be further reduced;

3) the foundation bearing capacity and the friction force are increased by the rotary jet piles in the open caisson, so that the sinking speed and the elevation of the open caisson can be controlled, and the over sinking is avoided;

4) the rotary jet piles in the open caisson lead soil bodies to be bonded and solidified, and drainage bottom sealing can be adopted, so that the construction environment of the bottom plate is improved, and the construction and waterproof quality of the bottom plate is improved.

Drawings

Fig. 1 is a schematic plan view of the present invention;

fig. 2 is a schematic sectional structure of the present invention;

the method comprises the following steps of 1-open caisson, 2-open caisson cutting edge feet, 3-partition curtain, 4-middle high-pressure jet grouting pile, 5-soil body, 6-cushion layer and 7-bottom plate.

Detailed Description

The invention is further explained below with reference to the drawings and the embodiments without limiting the scope of the invention.

Referring to fig. 1 to 2, the structure for preventing overboaking and upwelling of the open caisson in the soft soil foundation comprises a well wall of the open caisson 1; when the open caisson is sunk to about 20cm from the designed elevation, constructing a partition curtain 3 on the inner side of the well wall of the open caisson 1; constructing a middle high-pressure rotary jet grouting pile 4 in the middle of the open caisson, wherein the pile is arranged in a quincunx shape; excavating a soil body 5 after the strength of the partition curtain 3 and the middle high-pressure jet grouting pile 4 meets the requirement, and sinking the open caisson to the designed elevation; and pouring the cushion layer 6, and constructing the bottom plate 7 after the cushion layer is maintained until the strength is high enough to meet the requirement.

When the utility model is implemented concretely, when the open caisson sinks to about 20cm from the designed elevation, two rows of occluded high-pressure jet grouting piles are constructed inside the well wall 1 of the open caisson to form a partition curtain 3, which is equivalent to increasing the length of the edge foot of the open caisson and reducing the soil gushing phenomenon; meanwhile, the high-pressure rotary jet grouting piles 4 are constructed in the middle of the construction open caisson and arranged in a quincunx manner, so that the flowing plastic soil is bonded and solidified, the soil gushing phenomenon can be effectively eliminated, and the ground settlement caused by soil body flowing can be reduced; after the strength of the partition curtain and the middle high-pressure jet grouting pile 4 meets the requirement, excavating a soil body 5, sinking the open caisson to the designed elevation, and effectively controlling the soil gushing phenomenon in the period; the inner partition curtain 3 and the middle high-pressure jet grouting pile 4 in the sinking well increase the bearing capacity and the friction force of the foundation, so that the sinking speed and the elevation of the sinking well are controllable, the super sinking is avoided, the construction environment of the cushion layer 6 and the bottom plate 7 is improved, and the construction and waterproof quality of the bottom plate 7 is improved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a structure of preventing gushing soil is prevented surpassing sinking by open caisson in soft soil foundation, includes open caisson and the high pressure jet grouting pile under the floor, its characterized in that: sinking the open caisson to about 20cm from the designed elevation, constructing two rows of partition curtains consisting of mutually occluded and lapped high-pressure jet grouting piles along the inner side of the well wall of the open caisson, and arranging the high-pressure jet grouting piles positioned in the middle of the partition curtains in the open caisson to serve as foundation reinforcement.

2. The structure of claim 1, wherein the open caisson anti-overboaking and anti-gushing structure in the soft soil foundation is characterized in that: two rows of high-pressure jet grouting piles on the inner side of the open caisson wall are mutually occluded and lapped to form a partition curtain.

3. The structure of claim 1, wherein the open caisson anti-overboaking and anti-gushing structure in the soft soil foundation is characterized in that: the middle high-pressure rotary jet grouting pile in the sinking well is arranged in a quincunx shape.