Caisson wall cleaning system and caisson bottom sealing method

Abstract

This invention belongs to the field of underground engineering technology and discloses a caisson wall cleaning system and a caisson bottom sealing method. The caisson wall cleaning system includes a pull rope and a covering membrane. The pull rope is threaded through the covering membrane, which includes a first region and a second region joined together. The end of the second region furthest from the first region is fixed to the upper end of the cutting edge, which is located near the cutting edge of the inner wall of the caisson. The second region circumferentially wraps around the inner wall of the caisson, while the first region abuts against the second region. Pulling the pull rope causes the covering membrane to fold into a pouring state. In the pouring state, the first and second regions are respectively attached to the excavated surface of the caisson, and the edge of the first region is gathered to form a closed pouring surface. This caisson wall cleaning system can prevent silt, sediment, and other debris from adhering to the inner wall of the caisson, thereby improving the bonding quality between the bottom sealing concrete and the inner wall. Simultaneously, the covering membrane extends the seepage path of groundwater, improving the water-tightness of the bottom sealing.

Description

Technical Field

[0001] This invention relates to the field of underground engineering technology, and in particular to a caisson wall cleaning system and a caisson bottom sealing method. Background Technology

[0002] 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.

[0003] 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.

[0004] Therefore, there is an urgent need to design a caisson wall cleaning system to solve the above-mentioned problems in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide 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] To achieve this objective, the present invention adopts the following technical solution:

[0007] The well cleaning system includes:

[0008] Drawstring;

[0009] 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;

[0010] 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 respectively attached to the excavation surface of the caisson, and the edge of the first area is gathered to form a closed pouring surface.

[0011] Preferably, the caisson wall cleaning system further includes a fixing plug, and a fixing groove is provided on the inner well wall;

[0012] 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 connected to 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.

[0013] Preferably, 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, and the air supply channel is used to introduce gas into the airbag. The airbag is configured to expand after being inflated and push the fixed plug out of the fixed groove.

[0014] Preferably, 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.

[0015] Preferably, the caisson wall cleaning system further includes a fixed pulley, which is disposed on the inner wall of the caisson, and the pull rope is wound around the fixed pulley with its end extending out of the caisson opening.

[0016] Preferably, the first region is provided with ventilation holes.

[0017] The caisson sealing method, using the aforementioned caisson wall cleaning system, includes the following steps:

[0018] S1. 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.

[0019] S2. Excavate the soil layer to allow the caisson to sink to the specified depth;

[0020] S3. Pull the pull rope to fold the covering film to the pouring state;

[0021] S4. Pour concrete onto the pouring surface.

[0022] Preferably, step S3, before pulling the pull cord, further includes:

[0023] Remove the first region from the second region, and remove the end of the second region near the first region from the inner well wall.

[0024] Preferably, step S3, after pulling the pull cord, further includes:

[0025] Heavy objects are placed in the first area and the second area.

[0026] Preferably, the end of the second region away from the first region is buried in the inner well wall.

[0027] The beneficial effects of this invention are as follows:

[0028] The caisson wall cleaning system provided by this invention includes a pull rope and a covering membrane. The pull rope is threaded through the covering membrane, which comprises a first region and a second region spliced ​​together along the axial direction of the caisson. The first region is attached to the second region. Since one end of the second region is fixed to the upper end of the cutting edge of the inner wall of the caisson, and the second region is circumferentially attached to the inner wall, it plays a role in isolating the soil layer during the caisson sinking process. This effectively prevents silt, sediment, and other debris from adhering to the inner wall. The covering membrane can be peeled off from the inner wall by pulling the rope, ensuring the bonding quality between the bottom sealing concrete and the inner wall without manual cleaning, greatly improving construction efficiency. Construction safety: Pulling the cover membrane with the rope allows it to fold into a pouring state. When the cover membrane is in the pouring state, the first and second areas are respectively attached to the excavation surface of the caisson, and the edge of the first area is gathered to form a closed pouring surface. Therefore, when the cover membrane is pulled with the rope, the first and second areas can fold down from the inner wall of the caisson and cover the excavation surface, thus forming a sealing structure. This can seal the soil and groundwater below the excavation surface, preventing the soil from being impacted into the bottom sealing concrete, which would lead to an unstable bottom sealing and leakage. At the same time, it extends the seepage path of groundwater and greatly improves the water-proof performance of the caisson bottom sealing.

[0029] Using this caisson bottom sealing method, by covering the inner wall with a membrane and fixing the bottom of the second area to the upper end of the cutting edge of the inner wall, the soil layer is isolated. This prevents silt, sediment, and other debris from adhering to the inner wall during the caisson sinking process. The membrane can be removed from the inner wall by pulling the pull rope, eliminating the need for manual cleaning of the wall. This ensures the bonding quality between the concrete and the inner wall during bottom sealing, saving time and labor and improving construction efficiency. Because pulling the pull rope can fold the membrane into a pouring state, the membrane detaches from the inner wall and adheres to the excavated surface below the caisson. The first and second areas form a sealed pouring surface, greatly improving the mud and water isolation performance of the caisson bottom sealing, thereby enhancing the safety of the caisson. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the covering film provided in a specific embodiment of the present invention;

[0031] Figure 2 This is a side view of the caisson after the bottom is sealed, provided in a specific embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the inner wall structure of the caisson provided in a specific embodiment of the present invention;

[0033] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0034] Figure 5 yes Figure 3 A magnified view of a section at point B in the middle;

[0035] Figure 6 This is a schematic diagram of the edge structure of the covering membrane.

[0036] In the picture:

[0037] 100 - Caisson; 110 - Fixing groove;

[0038] 1-Drawstring;

[0039] 2-Covering film; 21-First region; 211-Ventilation hole; 22-Second region; 23-Concave toothed opening; 24-Rope threading protrusion;

[0040] 3-Fixing plug;

[0041] 4-Loose structure; 41-Air delivery channel; 42-Airbag;

[0042] 5- Fixed pulley. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0044] In the description of this invention, unless otherwise explicitly 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 specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly 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 directly above or diagonally above the second feature, or simply indicates 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 directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "right," and "left," 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0047] like Figures 1 to 3As shown, the present invention 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 respectively 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.

[0048] 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. Furthermore, the covering membrane 2 can be folded to a pouring state using the pull rope 1 to remove it from the inner wall, thereby cleaning the debris adhering to the covering membrane 2 onto the excavation surface. This eliminates the need for wall cleaning before sealing the bottom, ensuring the bonding quality between the bottom sealing concrete and the inner wall, significantly improving construction efficiency and safety. The cover membrane 2 is designed to be fully functional. When the cover membrane 2 is in the pouring state, the first region 21 and the second region 22 are respectively 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. Therefore, when the cover membrane 2 is pulled by the pull rope 1, the first region 21 and the second region 22 can fold downwards from the inner wall of the caisson and cover the excavation surface, thus forming a sealing structure that can seal the soil and groundwater below the excavation surface, greatly improving the mud and water isolation performance of the caisson bottom sealing. Specifically, the cover membrane 2 is a high-performance polymer membrane made of polyetheretherketone (PEEK), which has advantages such as 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 cover membrane 2 also has a certain degree of flexibility, allowing it to fold and gather under the pull of the pull rope 1, thereby forming a closed pouring surface.

[0049] 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 a rectangle, the long side of which is equal to the inner perimeter of the cross-section of the caisson 100, and the short side of which is not less than the pouring height of the bottom sealing concrete. The first region 21 is an enclosing arc, 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. 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 sinks 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 free ends of the first region 21 and the second region 22 detach from the inner well wall and flip downwards, passing through the plane where the fixed end of the second region 22 is located, until they are in contact with the excavation surface below the caisson 100. At this time, the covering membrane 2 is in the pouring state. During this process, the first region 21 is folded from above the fixed end to below the fixed end, and the free end of the second region 22 is also folded from above the fixed end to below the fixed end under the influence of the first region 21. When the covering membrane 2 is in the pouring state, both the first region 21 and the second region 22 are below the plane where the fixed end is located.

[0050] Furthermore, such as Figures 2 to 4 As shown, the caisson wall cleaning system also 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 set on the upper end of the cutting edge, the free end is connected to 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 is abutted against the first region 21 and inserted into the fixing groove 110, so that the free end is fixed in the fixing groove 110; specifically, before the caisson 100 sinking operation, the workers fix the fixed end at the upper end of the cutting edge of the inner wall of the caisson, and fold 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, and then use the fixing plug 3 to fix the first region 21 and the free end in the fixing groove 110.

[0051] Specifically, such as Figures 2 to 4 As shown, the caisson wall cleaning system also includes a release structure 4, which includes an airbag 42 and an air supply channel 41 set on the inner wall of the caisson. The air supply channel 41 is connected to the airbag 42, which is set at the bottom of the fixed groove 110. The air supply channel 41 is used to introduce gas into 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 into the air supply channel 41 from the ground. The operation is convenient, time-saving and labor-saving.

[0052] Specifically, the gas transmission channel 41 includes a gas transmission pipe and a ventilation cavity. The ventilation cavity is located in the inner wall of the well. One end of the gas transmission pipe is connected to the ventilation cavity, and the other end of the gas transmission pipe extends out of the ground along the axial direction of the vertical caisson 100 and is connected to a blower. It can be understood that the ventilation cavity is reserved during the construction of the caisson 100.

[0053] Specifically, such as Figure 1 and Figure 6 As shown, 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.

[0054] Furthermore, such as Figure 2 , Figure 3 as well as Figure 5 As shown, the well cleaning system also includes a fixed pulley 5, which is installed on the inner well wall. A pull rope 1 is wound around the fixed pulley 5, and the end of the pull rope 1 extends out of the well opening. The fixed pulley 5 can change the direction of the force, so the workers can pull the pull rope 1 on the bottom surface at the well opening to pull the covering membrane 2. Specifically, 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 to it are provided with concave teeth 23 and rope-passing protrusions 24. The pull rope 1 passes through the first short edge of the second region 22 in sequence. The curved edge of region 21 and the second short edge of region 22 form two movable rope ends at the fixed end of 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 edge of region 21 through the fixed pulley 5, thereby driving region 21 to flip downward, which in turn drives region 22 to flip downward as well, until region 21 and region 22 are respectively in contact with the excavation surface and form a pot-shaped pouring surface.

[0055] Furthermore, such as Figure 1 As shown, a vent hole 211 is provided on the first area 21. When the covering membrane 2 is pulled off from the inner well wall and adheres 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.

[0056] This embodiment also provides a method for sealing the bottom of a caisson, using the aforementioned caisson wall cleaning system, including the following steps:

[0057] 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.

[0058] 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.

[0059] 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 further improves the mud and water isolation performance of the bottom sealing.

[0060] S4. Pour concrete onto the pouring surface.

[0061] 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. 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 to 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.

[0062] Furthermore, before pulling the pull rope 1 in step S3, the method further includes: removing the first region 21 from 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 membrane 2 due to excessive pulling force.

[0063] Specifically, 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.

[0064] Furthermore, after pulling the pull rope 1 in step S3, the method further includes: dropping heavy objects into the first area 21 and the second area 22. The heavy objects can press down on the first area 21 and the second area 22, so that the first area 21 and the second area 22 fall quickly onto the excavation surface, thereby accelerating the adhesion of the covering membrane 2 to the excavation surface.

[0065] Furthermore, in order to improve the connection strength between the fixed end of the second region 22 and the caisson 100, the end of the second region 22 away from the first region 21 is embedded in the inner well wall; specifically, when making the caisson 100, the fixed end of the second region 22 is placed in the mold for making the caisson 100 in advance and aligned with the upper end of the cutting edge of the inner well wall, and then the caisson 100 is cast into shape.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A caisson wall cleaning system, characterized in that, include: 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 respectively 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, characterized in that, 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 connected to the first region (21). The first region (21) is in contact with 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, characterized in that, 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 used to introduce gas into the airbag (42). The airbag (42) is configured to push the fixed plug (3) out of the fixed groove (110) after it expands due to air.

4. The caisson wall cleaning system according to claim 1, characterized in that, 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, characterized in that, 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, characterized in that, 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 the following steps: S1. 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. S2. Excavate the soil layer to sink the caisson (100) to the specified depth; S3. Pull the pull rope (1) to fold the covering film (2) to the pouring state; S4. Pour concrete onto the pouring surface.

8. The method for sealing the bottom of a caisson according to claim 7, characterized in that, Before pulling the drawstring (1) in step S3, the following is also included: Remove the first region (21) from 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, characterized in that, After pulling the pull cord (1) in step S3, the following is also included: Heavy objects 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, characterized in that, The end of the second region (22) away from the first region (21) is buried in the inner well wall.

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