CN218713209U - Open caisson soil release drag reduction structure - Google Patents

Abstract

The utility model discloses an open caisson lets out native drag reduction structure, include: the soil release holes are arranged at intervals along the wall of the open caisson, are obliquely arranged and downwards face the inside of the open caisson compartment, and are internally provided with opening and closing mechanisms for opening and closing the soil release holes; wall side mud jacking pipe, it corresponds every and lets out the soil hole and all sets up one, wall side mud jacking pipe sets up and is close to the wall of a well outside along the open caisson wall of a well and sets up, wall side mud jacking pipe upper end extends to outside the open caisson well head, wall side mud jacking pipe lower extreme intercommunication grout outlet, it is located let out soil hole top and communicate to the outer soil layer of the open caisson wall of a well. The utility model has simple structure, less component elements, convenient processing and installation, direct action on the stratum causing the sinking difficulty of the open caisson, and repeated use along with the sinking of the open caisson; the construction method has the characteristics of strong construction performance and high reusability.

Description

Open caisson soil release drag reduction structure

Technical Field

The utility model relates to an open caisson foundation construction technical field. More specifically speaking, the utility model relates to an open caisson lets out native drag reduction structure.

Background

The open caisson is used as a foundation form, and is widely used as a bridge foundation, an anchorage and a water supply and drainage project due to large integral rigidity and good integrity. In recent years, with the construction of large-span bridges as fiery as possible, a plurality of sunk well foundations with spans reaching hundreds of meters are constructed, such as a sunk well foundation of south anchor of a large bridge at the north of Oujiang, a sunk well of 5# pier and 6# pier of a Changtai large bridge, and the like. The large open caisson is used as a foundation, the sinking depth reaches dozens of meters, and the ratio of the side friction resistance to the dead weight can reach more than 50 percent; particularly, in some deep soil layers with high clay content, the soil layers are hardened through long-term deposition, the friction is large, the side friction is high in occupation ratio, and the lack of effective resistance reduction measures becomes a primary factor for restricting the sinking work efficiency of the open caisson; under the condition of lacking effective resistance reduction measures, the risk of sudden sinking and the like is easily caused by the fact that the well is dug too deeply, and the equipment, the personnel safety and surrounding building structures are endangered. Therefore, an effective open caisson drag reduction structure is needed to effectively reduce the side friction resistance for different depths, so that the open caisson sinking work efficiency and the construction safety are improved.

SUMMERY OF THE UTILITY MODEL

One purpose of the utility model is to provide an open caisson soil release drag reduction structure, which has simple structure, small number of components, convenient processing and installation, direct action on the stratum causing the open caisson to sink difficultly, and repeated use along with the sinking of the open caisson; the construction method has the characteristics of strong construction performance and high reusability.

In order to achieve these objects and other advantages in accordance with the purpose of the invention, there is provided an open caisson earth leakage drag reduction structure, comprising: the soil release holes are arranged at intervals along the wall of the open caisson, are obliquely arranged and downwards face the inside of the open caisson compartment, and are internally provided with opening and closing mechanisms for opening and closing the soil release holes; wall side mud jacking pipe, it corresponds every hole of letting out soil and all sets up one, wall side mud jacking pipe sets up and is close to the wall of a well outside along the open caisson wall of a well and sets up, wall side mud jacking pipe upper end extends to outside the open caisson well head, wall side mud jacking pipe lower extreme intercommunication grout outlet, it is located let out soil hole top and communicate to the outer soil layer of the open caisson wall of a well.

Preferably, a reserved pipe is arranged in the wall of the open caisson, the upper end of the reserved pipe extends out of the open caisson mouth, and the lower end of the reserved pipe is communicated with the soil release hole.

Preferably, the reserved pipes are provided with two, the opening and closing mechanism comprises an inner side disc, an outer side disc and a pair of transmission rods, the pair of transmission rods are correspondingly located in the two reserved pipes, the top ends of the pair of transmission rods upwards extend to the outside of the open caisson wellhead, the lower ends of the pair of transmission rods are respectively connected with the inner side disc and the outer side disc, and the inner side disc and the outer side disc are respectively located at the lower end and the upper end of the soil discharge hole and just close the soil discharge hole.

Preferably, the upper end of the transmission rod is provided with a rotating handle.

Preferably, the rotating handle is in a T-shaped structure.

The utility model discloses at least, include following beneficial effect:

(1) The open caisson soil-releasing and resistance-reducing structure is simple in structure, small in number of components and convenient to process and install; the well wall is provided with a soil release hole, and the outer side of the well wall is provided with a wall side grouting pipe; after the soil release hole is opened, soil mass outside the well wall enters the compartment through the soil release hole in a mode of 'grouting and cutting at the wall side first and then scouring and lubricating', and the soil outside the well wall is loosened after soil release, so that the frictional resistance at the well wall side is reduced. Compared with the traditional drag reduction modes such as a slurry sleeve, an air curtain and the like, the method can be suitable for different stratums; secondly, the oil directly acts on the stratum causing the sinking difficulty of the open caisson and can be repeatedly used along with the sinking of the open caisson; the construction method has the characteristics of strong construction performance and high reusability.

(2) After the open caisson is sunk in place, the wall-side grouting pipe can carry out post grouting between the well wall and the soil layer to fill a gap between the well wall and the soil layer, improve the frictional resistance outside the open caisson, and further improve the bearing capacity and anti-floating stability of the open caisson foundation; has the characteristics of one tube with multiple purposes and one method with multiple purposes.

(3) The invention can promote the foundation design and construction development of the open caisson.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic view of the structure of the open caisson for earth leakage and drag reduction;

FIG. 2 is a schematic diagram of the slurry-spraying cutting in the process of sinking, earth-releasing and drag-reducing of the utility model;

FIG. 3 is a schematic view of the slurry-spraying lubrication scouring in the sinking well soil-releasing and resistance-reducing process of the utility model;

fig. 4 is the utility model discloses the construction flow chart of open caisson wall of a well soil release drag reduction.

Description of the reference numerals:

1, sinking a well; 2-soil release holes; 3-inner side disc; 4-outer disc; 5, reserving a pipe; 6, a transmission rod; 7-wall side grouting pipe; 61-turning the handle; 71-slurry outlet.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1, the utility model provides an open caisson leaks native drag reduction structure, include: the device comprises a plurality of soil release holes 2 which are arranged at intervals along the wall of the open caisson 1, wherein the soil release holes 2 are obliquely arranged and downwards face the bay of the open caisson 1, and an opening and closing mechanism is arranged in each soil release hole 2 and used for opening and closing the soil release holes 2; wall side mud jacking pipe 7, it corresponds every and lets out soil hole 2 and all sets up one, wall side mud jacking pipe 7 sets up and is close to the wall of a well outside along 1 wall of a well of open caisson and sets up, 7 upper ends of wall side mud jacking pipe extend to outside 1 well head of open caisson, 7 lower extremes of wall side mud jacking pipe communicate out thick liquid mouth 71, and it is located let out 2 tops of soil hole and communicate to 1 wall of a well soil layer outside the open caisson. A reserved pipe 5 is arranged in the wall of the open caisson 1, the upper end of the reserved pipe extends out of the wellhead of the open caisson 1, and the lower end of the reserved pipe 5 is communicated with the soil release hole 2.

In the technical scheme, the outer wall of the open caisson 1 is provided with soil release holes 2 at certain intervals, and the soil release holes 2 face the inside of the compartment and are arranged at a certain gradient with the horizontal direction; when the soil discharge hole 2 is opened, the soil outside the well wall can be used as a flow discharge channel from the soil to the compartment; a wall side mud jacking pipe 7 is arranged on the outer side of the well wall of the soil discharging hole 2, and a mud outlet 71 facing the outer side of the well wall is arranged at the upper part of the soil discharging hole 2.

In another technical scheme, reserve pipe 5 and be provided with two, the starting and stopping mechanism includes inboard disc 3, outside disc 4 and a pair of transfer line 6, and a pair of transfer line 6 corresponds and is located two and reserves pipe 5, and the top of a pair of transfer line 6 upwards extends to outside the open caisson 1 well head, and the lower extreme is connected respectively inboard disc 3 and outside disc 4, inboard disc 3 and outside disc 4 are located respectively let out the lower extreme and the upper end of soil hole 2 and just will let out soil hole 2 seals. The upper end of the transmission rod 6 is provided with a rotating handle 61 which is of a T-shaped structure.

In the technical scheme, the two ends of the soil release hole 2 are provided with the discs, and the discs are parallel to the well wall when the soil is not released; the top of the disc is connected with a transmission rod 6, the transmission rod 6 is positioned in the embedded pipe and extends to the top surface of the open caisson 1, the top of the transmission rod 6 is of a T-shaped structure, and the disc can rotate by rotating a cross rod of the T-shaped structure to open the soil release hole 2.

As shown in fig. 4, the concrete construction method of the open caisson 1 soil release and drag reduction structure of the present application is: connecting a high extension reserved pipe 5 and a transmission rod 6 with the open caisson 1, and then sinking the open caisson 1; 1) When the open caisson 1 is difficult to sink and needs drag reduction, a grouting pump injects a mixture of high-pressure water and high-pressure gas into the wall side grouting pipe 7, and the mixture is jetted and cut through a grout outlet 71 to form a soil layer outside the well wall, as shown in fig. 2; 2) The rotating T-shaped structure cross rod drives the disc to rotate through the transmission rod 6, the soil discharging hole 2 is opened, and soil layers on the outer side of the well wall can flow into the well wall compartment along the soil discharging hole 2; 3) As shown in fig. 3, the soil layer leaked into the soil release hole 2 is washed and lubricated by injecting clear water or slurry into the embedded pipe, so that the soil further flows into the well wall, and the soil outside the well wall is loosened after the soil is released, so that the side frictional resistance to the well wall is reduced; 4) Closing the soil discharge hole 2 after the resistance reduction is finished, sinking to a certain depth, and then carrying out resistance reduction on the well wall according to the steps 1) -3); 5) After the open caisson 1 sinks to the right position, cement slurry is injected into the soil discharge hole 2 through the pre-buried pipe, and the soil discharge hole 2 and the reserved pipe 5 are filled; 6) After 1 back cover of open caisson is accomplished as foundation structure, the slip casting pump passes through wall side slip casting pipe and pours into grout into to the wall of a well into, fills the space between closely knit wall of a well and the soil layer, improves 1 outside frictional resistance of open caisson, and then improves 1 basic bearing capacity of open caisson and anti superficial stability.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims (5)

1. The utility model provides an open caisson lets out soil drag reduction structure which characterized in that includes:

the soil release holes are arranged at intervals along the wall of the open caisson, are obliquely arranged and downwards face the inside of the open caisson compartment, and are internally provided with opening and closing mechanisms for opening and closing the soil release holes;

wall side mud jacking pipe, it corresponds every and lets out the soil hole and all sets up one, wall side mud jacking pipe sets up and is close to the wall of a well outside along the open caisson wall of a well and sets up, wall side mud jacking pipe upper end extends to outside the open caisson well head, wall side mud jacking pipe lower extreme intercommunication grout outlet, it is located let out soil hole top and communicate to the outer soil layer of the open caisson wall of a well.

2. The caisson soil-releasing drag-reducing structure of claim 1, wherein a reserved pipe is arranged in the wall of the caisson, the upper end of the reserved pipe extends out of the wellhead of the caisson, and the lower end of the reserved pipe is communicated with the soil-releasing hole.

3. The open caisson soil-discharging drag-reducing structure of claim 2, wherein there are two reserved pipes, the opening and closing mechanism comprises an inner disc, an outer disc and a pair of transmission rods, the pair of transmission rods are correspondingly located in the two reserved pipes, the top ends of the pair of transmission rods extend upwards to the outside of the open caisson wellhead, the lower ends of the pair of transmission rods are respectively connected with the inner disc and the outer disc, and the inner disc and the outer disc are respectively located at the lower end and the upper end of the soil-discharging hole and just close the soil-discharging hole.

4. The open caisson soil-releasing drag reducing structure of claim 3, wherein a rotating handle is provided on the upper end of the transmission rod.

5. The open caisson soil-releasing drag reduction structure of claim 4, wherein the turning handle is a "T" shaped structure.

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