Open caisson blade foot structure, open caisson and open caisson construction device

Abstract

The utility model relates to the technical field of underground space, in particular to an open caisson blade foot structure, an open caisson and an open caisson construction device, a first outer wall of the open caisson blade foot structure is provided with a groove, the groove is arranged in a circle in the circumferential direction of the open caisson, an air bag is arranged in the groove, and the air bag can expand and abut against the soil wall. According to the open caisson blade foot structure, the groove is formed in the first outer wall, the air bag can be embedded, leakage of lubricating and sinking assisting mud behind the open caisson wall can be reduced through the air bag, a mud sleeve is made to take effect, smooth sinking of an open caisson is guaranteed, the quality of the open caisson is improved, and the safety of operation in the open caisson is improved.

Description

Technical Field

[0001] This utility model relates to the field of underground space technology, and in particular to a caisson cutting edge structure, a caisson, and a caisson construction device. Background Technology

[0002] The development and utilization of urban underground space is progressing rapidly, and caissons are widely used as a method for constructing vertical shafts for underground spaces. However, when the soil is hard, caissons often struggle to sink. Injecting thixotropic mud behind the caisson wall to aid sinking is a common practice to ensure successful caisson descent. However, during construction, due to the pressure difference between the inside and outside of the caisson, the mud can easily leak along the wall and into the caisson's cutting edge, causing the mud sleeve to fail and hindering caisson descent. Utility Model Content

[0003] The purpose of this utility model is to address the problem in the existing technology that during the construction of caissons, the mud can easily leak into the caisson through the cutting edge of the caisson due to the pressure difference between the inside and outside of the caisson, leading to the failure of the mud sleeve and the obstruction of the caisson sinking. This utility model provides a caisson cutting edge structure, a caisson, and a caisson construction device.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] In the first aspect, this utility model provides a caisson cutting edge structure, wherein a groove is provided on the first outer wall of the caisson cutting edge structure, the groove is arranged in a circle along the circumference of the caisson, and an air bladder is provided in the groove, the air bladder being able to expand and abut against the soil wall.

[0006] The caisson cutting edge structure described in this utility model allows for the installation of airbags by setting grooves on the first outer wall. These airbags reduce the leakage of lubricating mud behind the caisson wall, enabling the mud sleeve to function effectively, ensuring smooth caisson sinking, improving caisson quality, and enhancing the safety of operations inside the caisson.

[0007] As a preferred technical solution of this utility model, the caisson cutting edge structure is a reinforced concrete structure.

[0008] As a further preferred technical solution of this utility model, a pre-embedded steel plate is provided in the groove, and a connector is provided on the airbag, the connector being connected to the pre-embedded steel plate.

[0009] As a further preferred technical solution of this utility model, the connecting member is a steel plate, and the steel plate is welded or bolted to the embedded steel plate;

[0010] Alternatively, the connector may be a magnet, which is attracted to the embedded steel plate.

[0011] As a preferred technical solution of this utility model, the airbag is a wear-resistant rubber structure, a composite structure, or a multi-layer structure.

[0012] As a preferred technical solution of this utility model, a plurality of grooves are arranged at vertical intervals along the caisson cutting edge structure, and an airbag is arranged in each groove.

[0013] As a further preferred technical solution of this utility model, each airbag is provided with a corresponding valve switch.

[0014] As a further preferred technical solution of this utility model, each airbag is provided with a pressure gauge.

[0015] Secondly, this utility model also provides a caisson, including the caisson cutting edge structure as described in any of the above claims.

[0016] The caisson described in this utility model can embed the airbag by setting the groove on the first outer wall. The airbag can reduce the leakage of lubricating mud behind the caisson wall, so that the mud sleeve can take effect, ensure the smooth sinking of the caisson, improve the quality of the caisson, and enhance the safety of the operation inside the caisson.

[0017] As a preferred technical solution of this utility model, the caisson is a circular caisson, a rectangular caisson, an elliptical caisson, or an irregularly shaped caisson.

[0018] Thirdly, this utility model also provides a caisson construction device, comprising:

[0019] An airbag is configured in a groove on the first outer wall of the caisson cutting edge structure, and the airbag is arranged in a circle along the circumference of the caisson.

[0020] An inflation tube extends into the caisson cutting edge structure and connects to the airbag;

[0021] An inflation component is connected to the inflation tube, and the inflation component inflates the airbag.

[0022] The caisson construction device of this utility model can embed airbags by setting the groove on the first outer wall. The airbags can reduce the leakage of lubricating mud behind the caisson wall, so that the mud sleeve can take effect, ensure the smooth sinking of the caisson, improve the quality of the caisson, and enhance the safety of the operation inside the caisson.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0024] The present invention discloses a caisson cutting edge structure, a caisson, and a caisson construction device. By setting the groove on the first outer wall, the airbag can be embedded. The airbag can reduce the leakage of lubricating mud behind the caisson wall, so that the mud sleeve can take effect, ensuring the smooth sinking of the caisson, improving the quality of the caisson, and enhancing the safety of the operation inside the caisson. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the caisson cutting edge structure in Example 1;

[0026] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0027] Figure 3 This is a schematic diagram illustrating the use of the caisson cutting edge structure in Example 1;

[0028] Figure 4 This is a schematic diagram illustrating the use of the caisson cutting edge structure in Example 2;

[0029] Figure 5 for Figure 4 Enlarged view of section B;

[0030] Figure 6 This is a schematic diagram of the use of the caisson cutting edge structure in Example 3.

[0031] The markings in the diagram are: 01-soil wall, 02-mud, 03-excavation face, 1-caisson cutting edge structure, 11-tread surface, 12-sloping surface, 13-first outer wall, 14-groove, 15-embedded steel plate, 16-second outer wall, 2-airbag, 21-inflation pipe, 22-inflation component. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0033] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0035] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0036] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0037] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0038] In related technologies, injecting thixotropic mud behind the caisson wall to aid sinking is widely used to ensure the smooth sinking of the caisson. However, during construction, due to the pressure difference between the inside and outside of the caisson, the mud can easily leak into the caisson through the cutting edge behind the wall, causing the mud sleeve to fail and hindering the sinking of the caisson. Therefore, the technical solution of this application was developed, which is described below in conjunction with... Figures 1 to 6 To elaborate.

[0039] Example 1

[0040] like Figures 1 to 3 As shown, the caisson cutting edge structure 1 of this utility model includes a tread 11, an inclined surface 12, and a first outer wall 13. The tread 11 is located at the bottom end. One side of the tread 11 is connected to the inclined surface 12, and the other side is connected to the first outer wall 13. The inclined surface 12 is located on the excavation side, and the first outer wall 13 is located on the soil wall 01 side. The caisson cutting edge structure 1 is a reinforced concrete structure.

[0041] like Figure 1 and Figure 2 As shown, when making the caisson cutting edge structure 1, it can be made on the ground surface or in a foundation pit after excavation. Before pouring concrete, a groove 14 is reserved on the first outer wall 13. A steel plate 15 is embedded in the groove 14, and an air inflator 21 is embedded in the caisson cutting edge structure 1.

[0042] Those skilled in the art will understand that a caisson is a ring-shaped structure with its outer wall attached to the soil wall 01 and its inner side requiring excavation. Therefore, the groove 14 is set in a circle around the circumference of the caisson. In the prior art, the caisson also has a second outer wall 16, which is located on the side of the soil wall 01 and is connected above the first outer wall 13. The first outer wall 13 and the second outer wall 16 are stepped, and the first outer wall 13 is closer to the soil wall 01 than the second outer wall 16. That is, there is a gap between the second outer wall 16 and the soil wall 01. Mud slurry 02 is injected into the gap to aid sinking and ensure that the caisson sinks smoothly.

[0043] An airbag 2 is provided within the groove 14. The airbag 2 has a connector that connects it to the embedded steel plate 15, thus fixing the airbag 2 within the groove 14. Simultaneously, the airbag 2 is connected to the inflation pipe 21 and the inflation component 22. All preparations and adjustments for the inflation component 22 are completed. After inflation, the airbag 2 can abut against the soil wall 01. The inflation component 22 can be an air compressor.

[0044] If the caisson cutting edge structure 1 is constructed in the foundation pit, the outside of the caisson also needs to be backfilled and compacted.

[0045] In some alternative embodiments, the connector is a steel plate, which is welded or bolted to the embedded steel plate 15; or, the connector is a magnet, which is attracted to the embedded steel plate 15 to fix the airbag 2 in the groove 14.

[0046] like Figure 3 As shown, before excavating the caisson, the inflation component 22 is first activated to inflate the airbag 2, so that the airbag 2 expands and adheres tightly to the soil wall 01 while maintaining pressure. Mud slurry 02 is then injected into the gap behind the caisson wall. It can be seen that after the airbag 2 expands and adheres tightly to the soil wall 01, it cuts off the channel for the mud slurry 02 to leak into the caisson.

[0047] The soil inside the caisson is excavated, and the caisson sinks under its own weight by cutting through the soil through the tread 11 (under-excavation). During the sinking process, mud slurry 02 is continuously added behind the wall, the caisson wall structure is raised, and the air inlet pipe 21 is extended.

[0048] The pressure of the airbag 2 is adjusted according to the pressure of the mud slurry 02 behind the wall. Assuming the height of the mud slurry 02 is h and its density is γ, the pressure at the bottom of the mud slurry 02 is γ×h (unit: kPa). The pressure of the airbag 2 must be ensured to be no less than this value. If the air pressure is insufficient, it needs to be increased.

[0049] In some optional embodiments, the airbag 2 is a wear-resistant rubber structure, a composite structure, or a multi-layer structure. Wear-resistant rubbers include styrene-butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), and polyurethane rubber (PU). In a composite structure, the cross-section of the airbag 2 is composed of a rubber layer and a wear-resistant layer sequentially arranged from the inside out, with the wear-resistant layer being, for example, a polytetrafluoroethylene (PTFE) layer. In a multi-layer structure, the cross-section of the airbag 2 is composed of several rubber layers sequentially arranged from the inside out.

[0050] The caisson cutting edge structure 1 described in this embodiment can embed the airbag 2 by setting the groove 14 on the first outer wall 13. The airbag 2 can reduce the leakage of lubricating and settling mud 02 behind the caisson wall, so that the mud sleeve can take effect, ensure the smooth sinking of the caisson, improve the quality of the caisson, and enhance the safety of the operation inside the caisson.

[0051] Example 2

[0052] like Figures 4 to 5 As shown, the caisson cutting edge structure 1 of this utility model, based on embodiment 1, has a plurality of grooves 14 arranged at vertical intervals along the caisson cutting edge structure 1 (the figure shows the case of two grooves 14), each groove 14 is provided with an airbag 2, and each airbag 2 is provided with a valve switch and / or a pressure gauge.

[0053] If the caisson encounters difficulties sinking during its descent, the upper airbag 2 can be depressurized while the lower airbag 2 can be pressurized. This allows the mud O2 to seep onto the lower airbag 2 without leaking into the caisson, increasing the lubrication area behind the wall and facilitating better caisson sinking. Simultaneously, multiple airbags 2 can serve as backups for each other. If one airbag 2 fails, at least one of the remaining airbags can be inflated to urgently cut off the mud O2 seepage.

[0054] Example 3

[0055] like Figure 6 As shown, the caisson cutting edge structure 1 of this utility model, based on embodiment 1, when encountering areas with hard soil or even rock strata during construction, uses hoisting equipment to lift the caisson structure (as shown by the upward arrow in the figure), and excavation equipment can excavate soil below the tread 11 to the excavation surface 03, or even beyond the first outer wall 13 (over-excavation), in order to allow the caisson to sink better. In this case, the gap behind the wall will be larger, and the airbag 2 needs to be inflated larger to fit tightly against the soil wall 01.

[0056] Example 4

[0057] As not shown in the figure, the difference between the caisson cutting edge structure 1 of this utility model and any of the embodiments 1 to 3 is that, in this embodiment, the air inflator 21 is not embedded and extended along the inside of the caisson cutting edge structure 1, but rather the air inflator 21 penetrates the inner and outer walls of the caisson cutting edge structure 1, is connected to the airbag 2 on the outer side, and is laid upward along the inner wall of the caisson cutting edge structure 1 on the inner side and connected to the air inflator 22.

[0058] Example 5

[0059] Unless otherwise illustrated, the caisson of this utility model includes a caisson cutting edge structure 1 as described in any of Embodiments 1 to 4, wherein the caisson is a circular caisson, a rectangular caisson, an elliptical caisson, or an irregularly shaped caisson.

[0060] Example 6

[0061] like Figures 1 to 6 As shown, the construction device for a caisson as described in Embodiment 5 of this utility model includes an airbag 2, an inflation pipe 21, and an inflation component 22.

[0062] The airbag 2 is disposed in the groove 14 provided on the first outer wall 13 of the caisson cutting edge structure 1, and the airbag 2 is arranged in a circle along the circumference of the caisson.

[0063] The air inflator 21 extends into the caisson cutting edge structure 1 and is connected to the airbag 2.

[0064] The inflation component 22 is connected to the inflation tube 21. The inflation component 22 inflates the airbag 2, causing the airbag 2 to expand and adhere tightly to the soil wall 01.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A caisson toe structure (1) characterised in that, The first outer wall (13) of the caisson blade foot structure (1) is provided with a groove (14), the groove (14) is arranged circumferentially on the caisson as a circle, the groove (14) is provided with an air bag (2), and the air bag (2) can be inflated and abutted on the soil wall (01).

2. Caisson toe structure (1) according to claim 1, characterized in that The caisson blade foot structure (1) is a reinforced concrete structure.

3. Caisson toe structure (1) according to claim 2, characterized in that The groove (14) is provided with a pre-embedded steel plate (15), the air bag (2) is provided with a connecting piece, and the connecting piece is connected to the pre-embedded steel plate (15).

4. Caisson toe structure (1) according to claim 3, characterized in that The connecting piece is a steel plate, which is welded or bolted to the pre-embedded steel plate (15). Alternatively, the connecting piece is a magnet, which is adsorbed to the pre-embedded steel plate (15).

5. Caisson toe structure (1) according to claim 1, characterized in that, The air bag (2) is a wear-resistant rubber structure, a composite structure or a multi-layer structure.

6. Celler blade structure (1) according to any of claims 1-5, characterized in that, A plurality of grooves (14) are arranged vertically and spaced apart along the caisson blade foot structure (1), and the air bag (2) is arranged in each groove (14).

7. A caisson spud leg structure (1) according to claim 6, characterized in that Each air bag (2) is provided with a valve switch.

8. A caisson, characterised in that, The caisson blade foot structure (1) comprises the caisson blade foot structure (1) according to any one of claims 1-7.

9. A caisson according to claim 8, characterised in that, The caisson is a circular caisson, a rectangular caisson, an oval caisson or a special-shaped caisson.

10. A caisson construction apparatus, characterized by, It comprises: An air bag (2) is arranged in the groove (14) provided on the first outer wall (13) of the caisson blade foot structure (1), and the air bag (2) is arranged circumferentially on the caisson as a circle; An inflation pipe (21) extends into the caisson blade foot structure (1) and is connected to the air bag (2); An inflation component (22) is connected to the inflation pipe (21).

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