CN210086275U - Double-wall hollow open caisson foundation - Google Patents

Double-wall hollow open caisson foundation Download PDF

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Publication number
CN210086275U
CN210086275U CN201920796163.3U CN201920796163U CN210086275U CN 210086275 U CN210086275 U CN 210086275U CN 201920796163 U CN201920796163 U CN 201920796163U CN 210086275 U CN210086275 U CN 210086275U
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China
Prior art keywords
shaft
open caisson
mud suction
foot
double
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CN201920796163.3U
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Chinese (zh)
Inventor
殷永高
吕奖国
李剑鸾
章征
陈修和
朱瑞允
纪厚强
余竹
杨大海
赵先民
沈宜萍
汪志甜
郑道明
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Anhui Transportation Holding Group Co Ltd
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Anhui Transportation Holding Group Co Ltd
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Priority to CN201920796163.3U priority Critical patent/CN210086275U/en
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Abstract

The utility model discloses a double-wall hollow open caisson foundation, which is characterized in that a double-wall hollow shaft with an annular cavity is formed by the inner wall of the shaft and the outer wall of the shaft, so that mud suction equipment can be put down through the annular cavity, a mud suction head of the mud suction equipment reaches the bottom foot of the shaft, the bottom foot of the shaft is a blade foot, and the blade foot is arranged on the inner side wall of the bottom foot of the shaft in a whole ring; in the sinking process of the shaft, the open caisson is maintained balanced by the pressure of the soil inside and outside and the pressure of the soil on the side by utilizing the mud suction equipment, and is precisely sunk in the vertical direction; the vertical force when the open caisson sinks is increased, the process is simple, the construction is convenient and fast, the open caisson sinks fast and accurately, the efficiency of open caisson sinking construction is improved, and the open caisson structure is suitable for land and underwater open caisson construction.

Description

Double-wall hollow open caisson foundation
Technical Field
The utility model relates to an use open caisson basis in engineering such as bridge, building, municipal administration, mine, water conservancy and ocean.
Background
The open caisson is made on the ground, is open at the top and bottom, is in the shape of a hollow shaft cylinder, has a cutting edge at the bottom, is sunk to the underground set depth by removing the soil body in the well and the well barrel and relying on the dead weight or being matched with a sinking-assisting measure, becomes an underground structure, and is widely used in the engineering of bridges, building, municipal administration, mines, water conservancy, oceans and the like.
The sinking construction of the open caisson requires safe structure, smooth sinking and deviation prevention. The shaft must overcome not only the positive resistance from the blade during the sinking process, but also the frictional resistance between the wall surface of the well and the soil. Along with the increase of the sinking depth of the open caisson, the frictional resistance of the well wall surface can be continuously increased, so that the frictional resistance becomes a main factor for restricting the smooth sinking of the open caisson.
In order to make the open caisson sink smoothly, two major measures can be roughly adopted, one is to increase the vertical force when the open caisson sinks, for example, the measures such as gravity type open caisson, heaped load weighting, back pressure, vertical shock excitation and the like are adopted; the other is to reduce the resistance suffered by the open caisson when sinking, in particular to reduce the frictional resistance of the well wall surface.
In order to reduce the frictional resistance of the well wall surface, the traditional method is divided into two main types according to whether soil in a well shaft is removed or not:
the first is to eliminate the earth inside the well shaft to eliminate the friction resistance of the inner wall of the well shaft and to set drag reducing material or measure to reduce the friction resistance of the outer wall of the well shaft, such as thixotropic slurry, air curtain, cobble, lubricant smeared on the well wall, water jet outside the well wall, etc.
The second is to adopt a central island method, set steps on the outer wall of the open caisson, not remove the soil in the shaft when sinking, set groover on the inner side of the well wall, and inject the retaining wall slurry while digging the groove (the groove width is generally 60cm), so that the inner and outer wall surfaces of the shaft are all in the slurry retaining wall groove, and the open caisson sinks under the action of self weight (or assisted with the measures of piling, back pressure, etc.). And after the open caisson is sunk in place, replacing and curing the mud outside the well wall, and simultaneously reinforcing the foundation at the inclined plane of the blade foot to support the dead weight of the open caisson. And then excavating the inner soil body and the bottom sealing of the open caisson to finish construction.
The first method is the most common sinking method of the open caisson, but the disturbance to soil mass and underground water level around the open caisson is large, special attention needs to be paid to prevent the sand gushing and mud bleeding phenomenon caused by overlarge pressure difference inside and outside the open caisson during sinking, the problems of large-scale deflection, stopping sinking, sudden sinking, even shaft fracture and the like of the open caisson easily occur, the construction period is delayed, and the manufacturing cost is increased; in the second method, the soil body in the open caisson prevents the soil body outside the open caisson from flowing into the open caisson, so that the sand gushing and mud pumping phenomena are avoided, the open caisson is limited to be deflected in a large range, the disturbance to the surrounding soil body and the underground water level is small, and the method is suitable for the condition that the settlement requirement of the foundation surrounding soil body is high. However, the method uses a special groover, has high equipment cost and large size and is not suitable for a small open caisson; the temporary slurry retaining wall is needed to be used during grooving, the problems of slurry preparation, recovery treatment, slurry replacement behind the wall, potential environmental pollution risks and the like exist, the material consumption is high, the cost is high, and the temporary slurry retaining wall cannot be used for overwater construction.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a for avoiding above-mentioned prior art not enough, provide a double-walled cavity open caisson basis, detach the local soil body of sword foot below through the orientation, keep open caisson both sides soil pressure balance, vertical power when the increase open caisson sinks, realize that the open caisson is accurate, continuous and sink fast with economical and reasonable mode to improve the efficiency of construction that the open caisson sinks.
The utility model discloses a solve the problem and adopt following technical scheme:
the utility model discloses characteristics of double-walled cavity open caisson basis are: the double-wall hollow shaft with the annular cavity is formed by the inner wall of the shaft and the outer wall of the shaft, so that the mud suction equipment can be placed downwards through the annular cavity, a mud suction head of the mud suction equipment reaches the bottom foot of the shaft, the bottom foot of the shaft is a cutting edge foot, and the cutting edge foot is arranged on the inner side wall of the bottom foot of the shaft in a whole ring mode.
The utility model discloses characteristics on double-walled cavity open caisson basis also lie in: the shaft is formed by vertically connecting all sections of cylinders, the bottom section of the shaft is an initial section, and rib walls are arranged between the inner wall of the shaft and the outer wall of the shaft, so that the shaft is reinforced; and uniformly separating each vertical channel from the annular cavity along the annular direction of the annular cavity by using the rib walls, wherein the mud suction equipment is arranged below the vertical channel, and a mud suction head of the mud suction equipment reaches the bottom foot of the shaft.
Compared with the prior art, the utility model discloses beneficial effect embodies:
1. the utility model discloses improve the pit shaft and be double-walled hollow structure to put in double-walled hollow structure and inhale mud equipment, the directional local soil body of detaching the sword foot below keeps open caisson both sides soil pressure balance, and vertical power when the increase open caisson sinks realizes with the mode that economic is reasonable that the open caisson is accurate, continuous, sinks fast, has effectively improved the efficiency of construction that the open caisson sinks.
2. The utility model discloses a sinking construction of open caisson basis is pollution-free, and is less to soil body, ground water level disturbance on every side, simple process, and the construction is convenient, is applicable to land and aquatic open caisson construction.
Drawings
FIG. 1 is a schematic diagram of directional soil sampling and precise balance sinking of the double-wall hollow open caisson foundation of the present invention;
FIG. 2 is a schematic structural view of a mud suction device used in cooperation with a medium-double wall hollow open caisson foundation of the utility model;
FIG. 3 is a schematic distribution diagram of a mud suction device used in conjunction with a medium-double wall hollow open caisson foundation of the present invention;
reference numbers in the figures: the soil body comprises an outer wall 1, an inner wall 2, a rib wall 3, a mud suction device 4, a mud suction head 4a, a vertical channel 5, a blade foot 6, a cavity below the blade foot 7, a soil body inside a shaft 8 and a soil body outside the shaft 9.
Detailed Description
Referring to fig. 1, 2 and 3, the double-wall hollow open caisson foundation in the embodiment is a double-wall hollow shaft with an annular cavity formed by a shaft inner wall 2 and a shaft outer wall 1, so that a mud suction device 4 can be lowered through the annular cavity, a mud suction head 4a of the mud suction device 4 reaches the bottom of the shaft, the bottom of the shaft is a blade foot 6, and the blade foot 6 is arranged on the inner side wall of the shaft bottom in a whole ring.
In the specific implementation, the shaft is formed by vertically connecting all sections of cylinders, the bottom section of the shaft is an initial section, and rib walls 3 are arranged between the inner wall 2 and the outer wall 1 of the shaft, so that the shaft is reinforced; the annular cavity is uniformly divided into vertical passages 5 along the circumferential direction by using the rib walls 3, the vertical passages 5 are communicated up and down in the shaft, the mud suction device 4 is arranged below the vertical passages 5, and the mud suction head 4a of the mud suction device 4 reaches the bottom feet of the shaft.
The sinking construction method of the double-wall hollow open caisson foundation in the embodiment is carried out according to the following steps:
step 1, manufacturing a bottom section of a shaft, enabling the starting section of the shaft to be connected with a high level, sink and stably form a bed, and placing mud suction equipment 4 in each vertical channel 5;
step 2, when the lower part of a mud suction head 4a of the mud suction device 4 reaches the bottom opening position of the initial section of the shaft, directionally removing local soil below the cutting edge 6 by using the mud suction device 4, forming a cavity 7 below the cutting edge in an annular area below the cutting edge 6, eliminating the front resistance of the soil born by the cutting edge 6, and sinking the shaft by using the self weight;
and step 3: when the shaft sinks to the right position, continuing to heighten and continuing to lower the mud suction device;
and 4, step 4: circulating the step 2 and the step 3 until the whole shaft sinks to the target position;
and 5: and removing soil bodies in the open caisson, and pouring bottom sealing concrete to finish construction.
In the sinking process of the shaft, water needs to be timely supplemented into the annular cavity, so that the water depth in the annular cavity meets the requirement of normal work of the mud suction equipment 4; if the sinking is blocked, sinking-assisting measures of high-pressure water jet or air curtains on the inner side and the outer side of the well wall are used for assisting the sinking of the well shaft; and auxiliary measures of stacking, dynamic compaction, shock excitation or cannon shock can be taken in the shaft, so that the collapse and subsidence of the soil body in the shaft are accelerated, the construction progress is accelerated, and the construction efficiency is improved.
The utility model discloses construction method is in the pit shaft sinking process, and pit shaft inside soil body 8 has prevented pit shaft outside soil body 9 from getting into the well, has effectively avoided the emergence of sand gushing mud bleeding phenomenon; because no gap exists between the shaft and the surrounding soil body, the soil pressure on two sides is balanced, the shaft is effectively limited to have transverse displacement and inclination in the sinking process, and the open caisson is forced to automatically guide and sink accurately along the vertical direction; the cavity in the annular area below the blade foot enables the soil body in the shaft to continuously collapse and vertically sink under the action of gravity, and the process of the collapse and the sinking just forms vertical downward negative friction resistance on the shaft wall, so that the vertical force of the shaft during sinking is increased, the sinking speed is greatly accelerated, and the effect is remarkable.
The utility model discloses the method is applicable to cast-in-place open caisson, also is applicable to prefabricated assembled open caisson, and the plane shape of its open caisson can be for circular, oval-shaped, rectangle or circle end shape.

Claims (2)

1. Double-walled cavity open caisson basis, characterized by: the double-wall hollow shaft with the annular cavity is formed by the shaft inner wall (2) and the shaft outer wall (1), so that the mud suction device (4) can be placed downwards through the annular cavity, a mud suction head (4a) of the mud suction device (4) reaches the bottom foot of the shaft, the bottom foot of the shaft is a cutting edge, and the cutting edge is arranged on the inner side wall of the bottom foot of the shaft in a whole ring mode.
2. The double-walled hollow caisson foundation of claim 1, wherein: the shaft is formed by vertically connecting all sections of cylinders, the bottom section of the shaft is an initial section, and a rib wall (3) is arranged between the inner wall (2) and the outer wall (1) of the shaft to reinforce the shaft; and uniformly separating each vertical channel from the annular cavity along the annular direction of the annular cavity by using the rib walls (3), wherein the mud suction equipment is arranged below the vertical channel, and a mud suction head of the mud suction equipment (4) reaches the bottom foot of the shaft.
CN201920796163.3U 2019-05-30 2019-05-30 Double-wall hollow open caisson foundation Active CN210086275U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920796163.3U CN210086275U (en) 2019-05-30 2019-05-30 Double-wall hollow open caisson foundation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920796163.3U CN210086275U (en) 2019-05-30 2019-05-30 Double-wall hollow open caisson foundation

Publications (1)

Publication Number Publication Date
CN210086275U true CN210086275U (en) 2020-02-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920796163.3U Active CN210086275U (en) 2019-05-30 2019-05-30 Double-wall hollow open caisson foundation

Country Status (1)

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CN (1) CN210086275U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111441376A (en) * 2020-04-03 2020-07-24 中交第四航务工程勘察设计院有限公司 Round caisson with balance mechanism and use method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111441376A (en) * 2020-04-03 2020-07-24 中交第四航务工程勘察设计院有限公司 Round caisson with balance mechanism and use method

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