Caisson wall cleaning system and caisson bottom sealing method

Abstract

A caisson wall cleaning system and a caisson bottom sealing method. The caisson wall cleaning system comprises a pull rope (1) and a covering membrane (2). The pull rope (1) is threaded through the covering membrane (2), and the covering membrane (2) comprises a first region (21) and a second region (22) connected to each other. An end of the second region (22) away from the first region (21) is fixed to an upper end of a cutting edge. The upper end of the cutting edge is a position on an inner caisson wall of a caisson (100) close to the cutting edge. The second region (22) circumferentially surrounds and covers the inner caisson wall. The first region (21) rests against the second region (22). By pulling the covering membrane (2) via the pull rope (1), the covering membrane (2) can be driven to fold over into a pouring state. In the pouring state, the first region (21) and the second region (22) jointly cover an excavated surface of the caisson (100), and an edge of the first region (21) is gathered to form a closed pouring surface.

Description

Caisson wall cleaning system and caisson bottom sealing method

[0001] This application claims priority to Chinese Patent Application No. 202510275499.5, filed with the Chinese Patent Office on March 10, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of underground engineering technology, such as a caisson wall cleaning system and a caisson bottom sealing method. Background Technology

[0003] Caissons are a common type of shaft-shaped structure in underground engineering, usually used as the foundation for bridge piers or other structures. The basic principle of their sinking is to use the weight of the shaft itself and the friction between the shaft wall and the soil layer, by excavating soil inside the shaft, so that the shaft gradually sinks in the soil layer.

[0004] After the caisson is lowered into the ground, its bottom needs to be sealed to improve its stability and safety. Before sealing the bottom, the inner wall of the caisson needs to be cleaned to remove silt, sediment, and other debris, thereby improving the bonding quality between the sealing concrete and the caisson wall. Currently, the common method for cleaning the caisson wall is to manually descend to the bottom and clean it. However, this method has the problems of low cleaning efficiency and insufficient cleaning effect, and it also poses certain dangers for caissons that require underwater cleaning. In addition, during the underwater pouring of the sealing concrete, the initial pouring of concrete creates a large impact force, causing silt and sand at the bottom of the caisson to be washed up and mixed into the sealing concrete, reducing the strength of the sealing concrete and easily forming seepage paths. Currently, methods such as filling with crushed stone layers and placing steel plates under the concrete guide pipe are commonly used to avoid the above situations. However, the method of filling with crushed stone is not economical, and placing steel plates is not suitable for caissons with a pot-shaped bottom. Summary of the Invention

[0005] This application provides a caisson wall cleaning system and a caisson bottom sealing method, which can prevent silt and sediment from adhering to the inner well wall, thereby improving the bonding quality between the bottom sealing concrete and the inner well wall, and can extend the seepage path between the bottom sealing concrete and the well wall, thereby improving the water-proofing effect of the bottom sealing of the non-draining caisson.

[0006] This application provides a caisson wall cleaning system, comprising:

[0007] Drawstring;

[0008] The covering membrane, the pull rope is threaded through the covering membrane, the covering membrane includes a first region and a second region spliced ​​together along the axial direction of the caisson, the end of the second region away from the first region is fixed to the upper end of the cutting edge of the inner wall of the caisson, the upper end of the cutting edge is the position of the inner wall of the caisson near the cutting edge, the second region surrounds the inner wall of the caisson in the circumferential direction, and the first region is attached to the second region;

[0009] The pull rope pulls the covering film, causing it to fold into a pouring state. In the pouring state, the first area and the second area are together attached to the excavation surface of the caisson, and the edge of the first area is gathered to form a closed pouring surface.

[0010] In some embodiments, the caisson wall cleaning system further includes a fixing plug, and a fixing groove is provided on the inner well wall;

[0011] The second region has a fixed end and a free end. The fixed end is away from the first region and is fixedly disposed on the upper end of the cutting foot. The free end is spliced ​​with the first region. The first region is attached to the free end along the radial direction of the caisson. The fixing plug abuts against the first region and is inserted into the fixing groove, so that the free end is fixed in the fixing groove.

[0012] In some embodiments, the well cleaning system further includes a release structure, which includes an airbag and an air supply channel disposed on the inner well wall. The air supply channel is connected to the airbag, the airbag is disposed at the bottom of the fixed groove, the air supply channel is configured to supply gas to the airbag, and the airbag is configured to expand after being inflated to push the fixed plug out of the fixed groove.

[0013] In some embodiments, the edge of the covering film is provided with concave teeth, and a rope-threading protrusion is formed between two adjacent concave teeth. The pull rope is threaded through the rope-threading protrusion, and the rope-threading protrusion can slide along the pull rope.

[0014] In some embodiments, the well cleaning system further includes a fixed pulley disposed on the inner well wall, and the pull rope is wound around the fixed pulley with its end extending out of the well opening.

[0015] In some embodiments, the first region is provided with ventilation holes.

[0016] This application also provides a method for sealing the bottom of a caisson, using the aforementioned caisson wall cleaning system, comprising:

[0017] Fix the end of the second region away from the first region to the upper end of the cutting foot, fold the first region over so that the first region covers the second region, and then cover the second region on the inner well wall;

[0018] Excavate the soil layer to allow the caisson to sink to the specified depth;

[0019] Pull the pull rope to fold the covering film to the pouring state;

[0020] Concrete is poured onto the surface to be poured.

[0021] In some embodiments, the method further includes, before pulling the drawstring:

[0022] Remove the first region from the covering surface of the second region, and remove the end of the second region near the first region from the inner well wall.

[0023] In some embodiments, after pulling the drawstring, the method further includes:

[0024] Preset weights are placed into the first area and the second area.

[0025] In some embodiments, the end of the second region away from the first region is embedded in the inner well wall. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the structure of the covering film provided in an embodiment of this application;

[0027] Figure 2 is a side view of the caisson after the bottom sealing is completed, according to an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the inner wall structure of the caisson provided in the embodiment of this application;

[0029] Figure 4 is a magnified view of part A in Figure 3;

[0030] Figure 5 is a magnified view of part B in Figure 3;

[0031] Figure 6 is a schematic diagram of the edge structure of the covering membrane.

[0032] In the picture:

[0033] 100. Caisson; 110. Fixing groove;

[0034] 1. Drawstring;

[0035] 2. Covering membrane; 21. First area; 211. Ventilation hole; 22. Second area; 23. Concave toothed opening; 24. Cord threading protrusion;

[0036] 3. Fixing plug;

[0037] 4. Loose-fitting structure; 41. Air delivery channel; 42. Airbag;

[0038] 5. Fixed pulley. Detailed Implementation

[0039] The present application will now be described in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely for illustrative purposes. For ease of description, only the structures relevant to the present application are shown in the accompanying drawings.

[0040] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application as appropriate.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or indicating that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or indicating that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In addition, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0043] As shown in Figures 1 to 3, this application provides a caisson wall cleaning system, which includes a pull rope 1 and a covering membrane 2. The pull rope 1 is threaded through the covering membrane 2. The covering membrane 2 includes a first region 21 and a second region 22 spliced ​​together along the axial direction of the caisson 100. The end of the second region 22 away from the first region 21 is fixed to the upper end of the cutting edge of the inner wall of the caisson. The upper end of the cutting edge is the position of the inner wall of the caisson 100 near the cutting edge. The second region 22 is wrapped around the inner wall of the caisson in the circumferential direction, and the first region 21 is attached to the second region 22 in the circumferential direction. Pulling the covering membrane 2 with the pull rope 1 can cause the covering membrane 2 to fold into a pouring state. In the pouring state, the first region 21 and the second region 22 are attached to the excavation surface of the caisson 100, and the edge of the first region 21 is gathered to form a closed pouring surface.

[0044] In this embodiment, since one end of the second region 22 is fixed to the upper end of the cutting edge of the inner wall of the caisson 100, and the second region 22 is circumferentially attached to the inner wall, it can effectively prevent silt, sediment and other debris from adhering to the inner wall during the sinking of the caisson 100. The covering membrane 2 can be folded to a pouring state by pulling the rope 1 to remove it from the inner wall, thereby cleaning the debris adhering to the covering membrane 2 to the excavation surface. This eliminates the need for manual cleaning before sealing the bottom, ensuring the bonding quality between the bottom sealing concrete and the inner wall, greatly improving construction efficiency and safety. Pulling the rope 1 allows the covering membrane 2 to be folded to a pouring state, thus removing the debris adhering to the covering membrane 2 to the excavation surface. When the cover membrane 2 is folded into the pouring state, the first region 21 and the second region 22 are together attached to the excavation surface of the caisson 100 when the cover membrane 2 is in the pouring state, and the edge of the first region 21 is gathered to form a closed pouring surface. Therefore, when the pull rope 1 pulls the cover membrane, the first region 21 and the second region 22 can be folded down from the inner well wall and covered on the excavation surface, thereby forming a sealing structure that can seal the soil and groundwater below the excavation surface, prevent the soil from being impacted into the bottom sealing concrete, causing the bottom sealing to be unstable and leaking, and at the same time extend the seepage path of groundwater, greatly improving the mud and water isolation performance of the caisson bottom sealing. For example, the covering membrane 2 is a high-performance polymer membrane made of polyetheretherketone, which has the characteristics of high temperature resistance, corrosion resistance, hydrolysis resistance and flame retardancy. It can stably cover the excavation surface at the bottom of the caisson 100 and seal the groundwater. At the same time, the covering membrane 2 also has a certain degree of flexibility and can be folded and retracted under the pull of the pull rope 1 to form a closed casting surface.

[0045] The shape of the covering membrane 2 can be set according to actual needs, as long as it can cover the inner well wall circumferentially and form a closed pouring surface when in the pouring state. For example, the second region 22 is rectangular, the length of the long side of the rectangle is equal to the inner perimeter of the cross-section of the caisson 100, and the length of the short side of the rectangle is not less than the pouring height of the bottom sealing concrete. The first region 21 is an enclosing arc shape, and the straight side of the first region 21 is spliced ​​with the second region 22; the second region 22 has a free end and a fixed end, the fixed end is the bottom of the second region 22 away from the first region 21, and the free end is the top of the second region 22 near the first region 21. The fixed end is fixedly connected to the upper end of the cutting edge of the inner well wall, and the upper end of the cutting edge is located in the inner well wall near the cutting edge. The free end is detachably connected to the inner well wall, and the axial distance between the free end and the fixed end along the caisson 100 is the length of the short side of the second region 22. Before the caisson 100 is lowered, workers fold the second region 22 around the axis of the caisson 100 and place the folded second region 22 against the inner wall of the caisson, with the two short sides of the second region 22 joined together. Then, workers fold the first region 21 along the axis of the caisson 100 so that it adheres to the free end of the second region 22. At this time, the covering membrane 2 is not in a poured state, and the second region 22 covers the inner wall of the caisson to ensure that silt and sediment are isolated by the covering membrane 2. When the caisson 100 is lowered to the designated depth, workers pull the pull rope 1. Because the covering membrane 2 is a flexible membrane structure, under the pull of the pull rope 1, the first region 21... The free ends of region 21 and region 22 detach from the inner well wall and flip downwards towards the bottom of the well, passing through the plane where the fixed end of region 22 is located until they are in contact with the excavation face below the caisson 100. At this time, the covering membrane 2 is in the pouring state. During this process, region 21 is folded from above the fixed end to below the fixed end, and the free end of region 22 is also folded from above the fixed end to below the fixed end under the influence of region 21. When the covering membrane 2 is in the pouring state, both region 21 and region 22 are below the plane where the fixed end is located.

[0046] In other embodiments, for square / rectangular caissons, the second region 22 can be rectangular, with its long side length equal to the inner perimeter of the square / rectangular caisson (i.e., the sum of the lengths of the four inner walls). The first region 21 is a square with curved corners that fits the bottom of the square / rectangular caisson. The straight edge of the first region 21 is seamlessly sealed and spliced ​​with the long side of the second region 22. After splicing, the second region 22 can be sequentially attached and covered along the four inner walls of the square / rectangular caisson. The first region 21 is attached to the free end of the second region 22. When the pull rope 1 is pulled, the edge with curved corners of the first region 21 can be smoothly gathered and formed into a closed casting surface that is completely adapted to the bottom of the square / rectangular caisson, which can also achieve the effect of preventing mud and water from entering.

[0047] In some embodiments, as shown in Figures 2 to 4, the caisson wall cleaning system further includes a fixing plug 3, and a fixing groove 110 is provided on the inner wall of the caisson. The second region 22 has a fixed end and a free end. The fixed end is away from the first region 21 and fixedly disposed on the upper end of the cutting edge. The free end is spliced ​​with the first region 21. The first region 21 is attached to the free end along the radial direction of the caisson 100. The fixing plug 3 abuts against the first region 21 and is inserted into the fixing groove 110, so that the free end is fixed in the fixing groove 110. Exemplarily, before the caisson 100 is lowered, the worker fixes the fixed end to the upper end of the cutting edge of the inner wall of the caisson and folds the first region 21 so that the first region 21 is attached to the second region 22 along the radial direction of the caisson 100. Then, the fixing plug 3 is used to fix the first region 21 and the free end in the fixing groove 110.

[0048] For example, as shown in Figures 2 to 4, the caisson wall cleaning system also includes a release structure 4. The release structure 4 includes an airbag 42 and an air supply channel 41 disposed on the inner wall of the caisson. The air supply channel 41 is connected to the airbag 42. The airbag 42 is disposed at the bottom of the fixed groove 110. The air supply channel 41 is configured to supply gas to the airbag 42. The airbag 42 is configured to expand after being inflated and push the fixed plug 3 out of the fixed groove 110. Because of the release structure 4, the workers do not need to go down into the caisson 100 to remove the fixed plug 3. They can remove the fixed plug 3 from the fixed groove 110 by supplying gas to the air supply channel 41 on the ground. The operation is convenient, time-saving and labor-saving.

[0049] For example, the gas transmission channel 41 includes a gas transmission pipe and a ventilation cavity. The ventilation cavity is formed in the inner wall of the well. The first end of the gas transmission pipe is connected to the ventilation cavity, and the second end of the gas transmission pipe extends out of the ground along the axial direction of the caisson 100 and is connected to a blower. It is understood that the ventilation cavity is reserved during the construction of the caisson 100.

[0050] For example, as shown in Figures 1 and 6, the edge of the covering membrane 2 is provided with concave teeth 23, and a rope-threading protrusion 24 is formed between two adjacent concave teeth 23. The pull rope 1 is threaded through the rope-threading protrusion 24, and the rope-threading protrusion 24 can slide along the pull rope 1. The concave teeth 23 provide clearance space for the edge of the first region 21 to converge, thereby ensuring that the covering membrane 2 can be tightened smoothly to form a closed casting surface.

[0051] In some embodiments, as shown in Figures 2, 3, and 5, the well cleaning system further includes a fixed pulley 5, which is disposed on the inner well wall. A pull rope 1 is wound around the fixed pulley 5, with its end extending out of the well opening. The fixed pulley 5 can change the direction of force, so workers can pull the pull rope 1 on the bottom surface at the well opening to pull the covering membrane 2. For example, the straight edge of the first region 21 is spliced ​​onto a long edge of the second region 22. The curved edge of the first region 21 and the two short edges of the second region 22 connected thereto are provided with concave teeth 23 and rope-passing protrusions 24. The pull rope 1 passes through the second region 21 in sequence. The first short side of 2, the curved side of the first region 21, and the second short side of the second region 22 form two movable rope ends at the fixed end of the second region 22. Both rope ends are wound around the fixed pulley 5 and extend out of the well opening. When the caisson 100 sinks to the specified depth, the workers pull the two rope ends of the pull rope 1 vertically upward. The pull rope 1 exerts a downward vertical force on the curved side of the first region 21 through the fixed pulley 5, thereby driving the first region 21 to flip downward, which in turn drives the second region 22 to flip downward as well, until the first region 21 and the second region 22 are respectively in contact with the excavation surface and form a pot-shaped pouring surface.

[0052] In some embodiments, as shown in FIG1, a vent hole 211 is provided on the first region 21. When the covering membrane 2 is pulled off from the inner well wall and adheres downward to the excavation face under the pull rope 1, the water between the covering membrane 2 and the excavation face will be discharged through the vent hole 211, thereby accelerating the adhesion between the covering membrane 2 and the excavation face and improving the adhesion between the covering membrane 2 and the excavation face.

[0053] This embodiment also provides a method for sealing the bottom of a caisson, using the aforementioned caisson wall cleaning system, including the following steps:

[0054] S1. Fix the end of the second region 22 away from the first region 21 to the upper end of the cutting edge, fold the first region 21 so that the first region 21 covers the second region 22, and then cover the second region 22 to the inner well wall. Before the caisson 100 sinks, the workers first cover the second region 22 to the inner well wall and fix the fixed end of the second region 22 to the upper end of the cutting edge. Then, fold the first region 21 downward and cover the free end of the second region 22 along the radial direction of the caisson 100. After that, the workers use the fixing plug 3 to abut against the folded first region 21 and plug the free ends of the first region 21 and the second region 22 into the fixing groove 110.

[0055] S2. Excavate the soil layer to sink the caisson 100 to the specified depth. Since the second area 22 is attached to the inner wall of the caisson and the bottom of the second area 22 is fixed to the upper end of the cutting edge, the covering membrane 2 can isolate the inner wall of the caisson from the soil layer during the sinking process of the caisson 100, thereby preventing silt, sediment and other debris from adhering to the inner wall of the caisson.

[0056] S3. Pull the pull rope 1 to fold the covering membrane 2 into the pouring state; after the caisson 100 sinks to the designated depth, the workers pull the pull rope 1 at the ground. Since the pull rope 1 is threaded through the covering membrane 2, pulling the pull rope 1 upwards can cause the covering membrane 2 to shrink and its edges to close, thereby forming a closed pouring surface on the excavation surface, which improves the mud and water isolation performance of the bottom sealing.

[0057] S4. Pour concrete onto the pouring surface.

[0058] Using this caisson sealing method, by attaching a covering membrane 2 to the inner well wall and fixing the bottom end of the second area 22 to the upper end of the cutting edge of the inner well wall, the soil layer is isolated. This prevents silt, sediment, and other debris from adhering to the inner well wall during the sinking of the caisson 100. Furthermore, the covering membrane 2 can be removed from the inner well wall by pulling the pull rope 1, eliminating the need for manual cleaning of the wall. This ensures the bonding quality between the concrete and the inner well wall during sealing, saving time and effort and improving construction efficiency. Since pulling the pull rope 1 can fold the covering membrane 2 into the pouring state, the covering membrane 2 detaches from the inner well wall and adheres to the excavation surface below the caisson 100. The first area 21 and the second area 22 form a closed pouring surface, which greatly improves the mud and water isolation performance of the caisson sealing, thereby improving the safety of the caisson 100 in use.

[0059] In some embodiments, before pulling the pull rope 1 in step S3, the method further includes: removing the first region 21 from the covering surface of the second region 22, and removing the end of the second region 22 near the first region 21 from the inner well wall, thereby reducing the pulling resistance of the pull rope 1 and preventing damage to the pull rope 1 or the covering film 2 due to excessive pulling force.

[0060] For example, a release structure 4 is provided on the inner well wall. Before pulling the pull rope 1, the operator uses the release structure 4 to remove the free end of the fixed second region 22 and the fixed plug 3 of the first region 21 from the fixed groove 110. At this time, the free ends of the first region 21 and the second region 22 are unlocked, making it easy for the pull rope 1 to pull and fold downwards. For example, the release structure 4 includes an air supply channel 41 and an air bag 42. The air supply channel 41 is provided on the inner well wall, and the air bag 42 is provided at the bottom of the fixed groove 110. The air supply channel 41 is connected to the air bag 42. When it is necessary to remove the fixed plug 3 from the fixed groove 110, the operator introduces gas into the air bag 42 through the air supply channel 41 from the ground, so that the air bag 42 expands and pushes the fixed plug 3 out of the fixed groove 110, thereby releasing the fixed connection between the free ends of the first region 21 and the second region 22 and the inner well wall.

[0061] In some embodiments, after pulling the pull rope 1 in step S3, the method further includes: placing a preset weight on the first region 21 and the second region 22. The preset weight can press down on the first region 21 and the second region 22, so that the first region 21 and the second region 22 fall quickly onto the excavation surface, thereby accelerating the adhesion of the covering membrane 2 to the excavation surface.

[0062] In some embodiments, the aforementioned preset weights can be sandbags, smooth concrete blocks, or rounded cast iron counterweights. Such weights are water-resistant and will not puncture the covering membrane 2. During actual deployment, the weight of the weights can be adjusted according to the size of the caisson, the area and strength of the covering membrane 2 to ensure uniform distribution and no single-point overload, thereby accelerating the adhesion of the covering membrane 2 to the excavation surface.

[0063] In some embodiments, in order to improve the connection strength between the fixed end of the second region 22 and the caisson 100, one end of the second region 22 away from the first region 21 is embedded in the inner well wall. Exemplarily, when manufacturing the caisson 100, the fixed end of the second region 22 is pre-placed in the mold for manufacturing the caisson 100 and aligned with the upper end of the cutting edge of the inner well wall, and then the caisson 100 is cast into shape.

Claims

1. A caisson wall cleaning system, comprising: Drawstring (1); Covering membrane (2), the pull rope (1) is threaded through the covering membrane (2), the covering membrane (2) includes a first region (21) and a second region (22) spliced ​​together along the axial direction of the caisson (100), the end of the second region (22) away from the first region (21) is fixed to the upper end of the cutting foot, the upper end of the cutting foot is the position of the inner wall of the caisson (100) near the cutting foot, the second region (22) surrounds the inner wall of the caisson in the circumferential direction, and the first region (21) is attached to the second region (22); The pull rope (1) pulls the covering membrane (2) and can cause the covering membrane (2) to fold into the pouring state. In the pouring state, the first area (21) and the second area (22) are together attached to the excavation surface of the caisson (100), and the edge of the first area (21) is gathered to form a closed pouring surface.

2. The caisson wall cleaning system according to claim 1, wherein, The caisson wall cleaning system also includes a fixing plug (3), and a fixing groove (110) is provided on the inner well wall; The second region (22) has a fixed end and a free end. The fixed end is away from the first region (21) and is fixedly disposed on the upper end of the cutting edge. The free end is spliced ​​with the first region (21). The first region (21) is attached to the free end along the radial direction of the caisson (100). The fixing plug (3) abuts against the first region (21) and is inserted into the fixing groove (110) so that the free end is fixed in the fixing groove (110).

3. The caisson wall cleaning system according to claim 2, wherein, The well cleaning system also includes a release structure (4), which includes an airbag (42) and an air supply channel (41) disposed on the inner well wall. The air supply channel (41) is connected to the airbag (42), and the airbag (42) is disposed at the bottom of the fixed groove (110). The air supply channel (41) is configured to supply gas to the airbag (42), and the airbag (42) is configured to expand after being ventilated and push the fixed plug (3) out of the fixed groove (110).

4. The caisson wall cleaning system according to claim 1, wherein, The edge of the covering film (2) is provided with concave teeth (23), and a rope-threading protrusion (24) is formed between two adjacent concave teeth (23). The pull rope (1) is threaded through the rope-threading protrusion (24), and the rope-threading protrusion (24) can slide along the pull rope (1).

5. The caisson wall cleaning system according to claim 4, wherein, The well cleaning system also includes a fixed pulley (5), which is installed on the inner well wall. The pull rope (1) is wound around the fixed pulley (5) and the end of the pull rope (1) extends out of the well opening.

6. The caisson wall cleaning system according to claim 1, wherein, The first region (21) has ventilation holes (211).

7. A method for sealing the bottom of a caisson, using the caisson wall cleaning system as described in any one of claims 1-6, comprising: Fix one end of the second region (22) away from the first region (21) to the upper end of the cutting foot, fold the first region (21) over so that the first region (21) covers the second region (22), and then cover the second region (22) on the inner well wall; Excavate the soil layer to allow the caisson (100) to sink to the specified depth; Pull the pull rope (1) to fold the covering film (2) to the pouring state; Concrete is poured onto the surface to be poured.

8. The method for sealing the bottom of a caisson according to claim 7, further comprising, before pulling the pull rope (1): Remove the first region (21) from the surface of the second region (22), and remove the end of the second region (22) near the first region (21) from the inner well wall.

9. The method for sealing the bottom of a caisson according to claim 7, further comprising, after pulling the pull rope (1): Preset weights are placed into the first area (21) and the second area (22).

10. The method for sealing the bottom of a caisson according to claim 7, wherein, The end of the second region (22) away from the first region (21) is buried in the inner well wall.

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