Setting type open caisson bottom sealing concrete water seepage treatment method

Abstract

The invention discloses a setting type open caisson bottom sealing concrete water seepage treatment method, and belongs to the technical field of railway open caisson bottom sealing water seepage treatment construction. Comprising the following treatment steps: pumping water in a cofferdam, cleaning a foundation, performing chiseling treatment on a bottom sealing concrete structure of each open caisson, performing quality inspection on the bottom sealing concrete structure of each open caisson, performing drainage treatment, performing leakage treatment, performing cover plate construction and performing PVC (Polyvinyl Chloride) pipe treatment. According to the scheme, the method is simple and easy to implement, the problem of water seepage of the open caisson bottom sealing concrete can be effectively solved, and the construction quality of the tower column foundation is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of railway caisson bottom seal water seepage treatment construction, and provides a set-type caisson bottom seal concrete water seepage treatment method which is simple and easy to implement, can effectively solve the caisson bottom seal concrete water seepage problem and ensure the tower column foundation construction quality. Background Art

[0002] With the continuous development of society, many bridge projects have been put into use one after another. At the same time, related problems such as bridge diseases have become increasingly prominent. Caisson foundation plays an important role in bridge construction. It is not only a basic structure, but also a structure used to retain soil and water during construction. During the sinking process, there is no need to set up pit wall support or sheet pile wall, which greatly simplifies the construction process. Caisson foundation is a key component of the substructure of the underwater bridge. Once there is a problem in its construction, it is very likely to cause serious consequences such as damage to the superstructure and defects in the tower column foundation. Especially in the caisson bottom sealing link, if there is a concrete mud interlayer or the concrete is not dense enough, it will further cause uneven force on the tower column foundation, which will inevitably form a weak link in the tower column foundation, and then the cover plate and the tower base will be in a bad stress state for a long time, which will have a negative impact on the normal use of the bridge. If it is not rectified in time, it may even cause major safety accidents.

[0003] At present, the treatment methods used for the remediation of caisson foundation defects are mainly grouting and the use of waterproof coatings, but these methods have the disadvantage of subsequent water leakage and the treatment effect is not satisfactory.

[0004] Therefore, this industry urgently needs a construction plan that can effectively repair the problem of water seepage in the bottom concrete of the set caisson. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method for treating water seepage in the bottom concrete of a set caisson, aiming to solve the technical defects of the existing traditional grouting filling and waterproof coating treatment methods, such as the disadvantages of subsequent easy leakage and unsatisfactory effect.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a method for treating water seepage in a set-up caisson bottom sealing concrete, which comprises the following steps:

[0008] The first step is to pump out water and clean the foundation inside the cofferdam.

[0009] After the bottom concrete structure of each caisson in the cofferdam reaches the designed strength, use a centrifugal pump to pump water out of the cofferdam. During the pumping process, pay close attention to the changes in the water level in the cofferdam to promptly determine whether there is leakage. Once leakage is found, take appropriate plugging measures immediately.

[0010] When the remaining water depth in the cofferdam is about m, high-pressure water jetting is used to clean the mud and sand deposited on the well wall and the bottom concrete structure until all the water in the cofferdam is drained;

[0011] The second step is to roughen the bottom concrete structure of each caisson.

[0012] The bottom sealing concrete structure is roughened by mechanical roughening, and the cement mortar and loose layers on the surfaces of the wellbore bottom sealing concrete, the well wall bottom sealing concrete and the compartment bottom sealing concrete in the bottom sealing concrete structure are removed by roughening, and then the residues formed by the removed cement mortar and the loose layers are cleaned up and finally rinsed with water; the first bottom sealing and blade foot sealing in the bottom sealing concrete structure do not need to be roughened.

[0013] The third step is to conduct a quality inspection on the bottom concrete structure of each caisson.

[0014] Conduct a comprehensive inspection of the well bottom sealing concrete, the well wall bottom sealing concrete and the compartment bottom sealing concrete in the bottom sealing concrete structure described in the second step to check whether there are any quality defects and whether there is any water leakage in the bottom sealing concrete structure;

[0015] If there are no quality defects and no water leakage, proceed with the subsequent cover slab reinforcement construction and cover slab concrete pouring construction;

[0016] If there are quality defects, that is, honeycomb-shaped holes on the surface of the well bottom concrete, well wall bottom concrete and compartment bottom concrete in the bottom concrete structure, the holes shall be cut into bell mouths, rinsed with water, and then repaired with cement mortar, and then compacted with concrete of a higher grade to strengthen maintenance;

[0017] If there is water leakage, carry out subsequent drainage and leakage treatment;

[0018] The fourth step is drainage treatment.

[0019] Drill a "V" shaped water flow channel to collect water in a single well.

[0020] If the leaking part of the caisson is located on one side of its wall plate, after roughening the concrete structure of the bottom of each caisson in the second step, use a pneumatic pick to dig a "V"-shaped water flow groove a along the side plate of the caisson wall;

[0021] If the leakage is located in the middle of the leaking caisson, in addition to the V-shaped water flow groove a along the side plate of the caisson wall, it is also necessary to dig another V-shaped water flow groove b of the same specification in the middle of the bottom concrete of the leaking caisson hole along the upstream and downstream direction of the water flow, and the V-shaped water flow groove b is interconnected with the V-shaped water flow groove a;

[0022] Pipeline layout with multiple wells to collect water,

[0023] During the construction of the cover plate reinforcement, if the water leakage in the cofferdam does not affect the normal construction, the leaking caissons can be connected to each other using the pipes pre-buried in the bottom concrete of the compartments of each caisson, and the water flow can be guided to converge at the caisson with the lowest bottom elevation of the well bottom concrete to form water accumulation;

[0024] Drainage at the lowest point in the cofferdam.

[0025] A water pump is arranged in the caisson with the lowest bottom elevation, and the accumulated water is discharged by the water pump to ensure a relatively dry construction environment;

[0026] Step 5: Treat the leak.

[0027] A steel plate covering the 'V'-shaped water flow trough b is laid on the 'V'-shaped water flow trough b opened in the leaking caisson, a PVC pipe is fixed on the steel plate, and the bottom end of the PVC pipe is connected to the 'V'-shaped water flow trough b;

[0028] Step 6: Cover plate construction.

[0029] Before starting the construction of the cover slab concrete, the remaining water in the caisson with the lowest bottom elevation must be completely drained; when pouring the cover slab concrete, a dedicated person must be arranged to connect the self-priming pump with the laid PVC pipe to suck out the seepage water in the pipe and discharge it to the outside of the cofferdam to prevent it from flowing into the concrete being poured;

[0030] Step 7: PVC pipe processing.

[0031] After the pouring and maintenance of the cover slab concrete are completed, the reserved PVC pipe is connected to the external pipe until it is flush with the external water level so that the internal and external water pressures remain consistent; finally, the grouting pipe is inserted into the bottom of the PVC pipe, and the grouting material labeled C is used for grouting sealing operations.

[0032] In order to ensure the close bonding between the new and old concrete, improve the bonding force, form a rough surface and improve the bonding strength, the above scheme further comprises: in the second step, during the roughening treatment of the bottom concrete structure of each caisson, the bottom concrete structure is roughened until the coarse aggregate is exposed, and the exposed fresh concrete area should not be less than % of the total area.

[0033] In order to take into account both drainage and reducing the labor intensity of workers, in the above scheme, further: the opening width of the 'V'-shaped water flow trough b and the "V"-shaped water flow trough a in the fourth step are both set to cm, and the height is both set to cm.

[0034] In order to take into account both drainage and load-bearing properties, in the above scheme, further: the pipeline described in the fourth step adopts a φmm steel pipe.

[0035] To facilitate material acquisition, in the above scheme, further: the width of the steel plate in the fifth step is cm and the thickness is mm; the height of the PVC pipe is m and the outer diameter is cm, and a sealing pipe joint is provided at the top of the PVC pipe.

[0036] To ensure the thoroughness of drainage, in the above solution, further: the bottom end of the PVC pipe is tightly against the top surface of the 'V'-shaped water flow trough b.

[0037] To ensure the sealing performance, in the above solution, further: the steel plate is sealedly connected to the PVC pipe, and the steel plate is sealedly connected to the 'V'-shaped water flow channel b.

[0038] In order to facilitate the fixing of the steel plate, in the above scheme, further: triangular baffles are provided at the two short sides of the steel plate, and both sides of the baffles are sealed and compacted with C concrete.

[0039] In order to reduce the construction cost, in the above scheme, further: C concrete is used to seal the space between the steel plate and the PVC pipe.

[0040] In order not to affect the subsequent construction, in the above scheme, further: the corresponding plugging measures described in the first step refer to filling the surrounding area of ​​the leakage on the cofferdam with a plugging agent, and sealing it with epoxy quick-drying cement to ensure that it can be cured in a short time.

[0041] The beneficial effects of the present invention are:

[0042] (1) The grouting method used is simple and efficient. After grouting the leakage area, its fullness is high, which can effectively ensure the quality of grouting.

[0043] (2) Compared with the traditional grouting filling method, the grouting operation in the present invention extends the grouting pipe to the bottom of the PVC pipe, which can fully ensure the internal filling effect and the quality of the entity.

[0044] (3) This method is simple and easy to implement as a whole, and can effectively solve the problem of water leakage in the bottom concrete of the caisson, thereby effectively ensuring the quality of the remediation of defects in the caisson foundation.

[0045] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0047] Figure 1 It is a schematic diagram of the structure of the entire cofferdam of the present invention when viewed from above;

[0048] Figure 2 It is a structural schematic diagram of a single caisson of the present invention;

[0049] Figure numerals: 1. First bottom sealing concrete; 2. Wellbore bottom sealing concrete; 3. Well wall bottom sealing concrete; 4. Compartment bottom sealing concrete; 5. Blade foot sealing concrete; 6. Baffle; 7. Steel plate; 8. PVC pipe; 9. 'V'-shaped water flow trough b; 10. 'V'-shaped water flow trough a; 11. Cofferdam; 12. Caisson. DETAILED DESCRIPTION

[0050] The present invention is further described below in conjunction with specific implementation methods. Among them, the accompanying drawings are only used for exemplary descriptions, and only schematic diagrams are shown, not physical diagrams, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. In the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0051] In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0052] like Figures 1 to 2 As shown, the present invention provides a method for treating water seepage in a set-up caisson bottom seal concrete, which comprises the following steps:

[0053] The first step is to pump out water and clean the foundation inside the cofferdam 11.

[0054] After the bottom sealing concrete structure of each caisson 12 in the cofferdam 11 reaches the designed strength, a centrifugal pump is used to carry out a pumping operation in the cofferdam 11; during the pumping operation, the change of the water level in the cofferdam 11 is closely monitored to timely determine whether there is leakage. Once leakage is found, corresponding plugging measures must be taken immediately;

[0055] When the water in the cofferdam 11 is pumped out to a remaining water depth of about 1 m, high-pressure water jetting is used to clean the mud and sand deposited on the well wall and the bottom concrete structure of each 12 until all the water in the cofferdam 11 is pumped out.

[0056] The second step is to roughen the bottom concrete structure of each caisson 12.

[0057] The bottom seal concrete structure is roughened by mechanical roughening, and the cement mortar and loose layers on the surface of the well bottom seal concrete 2, the well wall bottom seal concrete 3 and the compartment bottom seal concrete 4 in the bottom seal concrete structure are removed, and then the residues formed by the removed cement mortar and the loose layers are cleaned up, and finally rinsed with water. The first bottom seal 1 concrete and the blade foot plugging 5 concrete in the bottom seal concrete structure do not need to be roughened.

[0058] The third step is to inspect the quality of the bottom concrete structure of each caisson 12.

[0059] Conduct a comprehensive inspection on the well bottom sealing concrete 2, the well wall bottom sealing concrete 3 and the compartment bottom sealing concrete 4 in the bottom sealing concrete structure in the second step to check whether there are any quality defects and whether there is any water leakage in the bottom sealing concrete structure;

[0060] If there are no quality defects and no water leakage, proceed with the subsequent cover slab reinforcement construction and cover slab concrete pouring construction;

[0061] If there are quality defects, that is, honeycomb-shaped holes exist on the surface of the well bottom concrete 2, the well wall bottom concrete 3 and the compartment bottom concrete 4 in the bottom concrete structure, the holes shall be cut into bell mouths, rinsed with water, and then repaired with 1:2-1:2.5 cement mortar, and then compacted with concrete of a higher grade to strengthen maintenance;

[0062] If there is water leakage, carry out subsequent drainage and leakage treatment.

[0063] The fourth step is drainage treatment.

[0064] Drill a "V" shaped water flow channel to collect water in a single well.

[0065] If the leakage in the leaking caisson 12 is located on one side of its wall plate, after the roughening treatment of the bottom concrete structure of each caisson 12 is completed in the second step, a "V"-shaped water flow groove a10 is excavated along the side plate of the wall of the leaking caisson 12 using a pneumatic pick;

[0066] If the leakage in the leaking caisson 12 is located in the middle of it, in addition to the "V"-shaped water flow groove a10 excavated along the side plate of the well wall, it is also necessary to excavate another "V"-shaped water flow groove b9 of the same specification in the middle of the well hole bottom sealing concrete 2 of the leaking caisson 12 along the upstream and downstream direction of the water flow, and the "V"-shaped water flow groove b9 and the "V"-shaped water flow groove a10 are mutually connected;

[0067] Pipeline layout with multiple wells to collect water,

[0068] During the construction of the cover plate reinforcement, if the water leakage in the cofferdam 11 does not affect the normal construction, the leaking caissons 12 are connected to each other by using the pipes pre-buried in the compartment bottom sealing concrete 4 of each caisson 12, and the water flow is guided to converge to the caisson 12 with the lowest bottom sealing elevation of the well bottom sealing concrete 2 to form water accumulation;

[0069] Drainage at the lowest position in the cofferdam 11,

[0070] A water pump is arranged in the caisson 12 with the lowest bottom elevation, and the accumulated water is discharged by the water pump to ensure a relatively dry construction environment.

[0071] Step 5: Treat the leak.

[0072] A steel plate 7 covering the 'V'-shaped water flow trough b9 is laid on the 'V'-shaped water flow trough b9 opened in the leaking caisson 12, and a PVC pipe 8 is fixed on the steel plate 7, and the bottom end of the PVC pipe 8 is connected to the 'V'-shaped water flow trough b9.

[0073] Step 6: Cover plate construction.

[0074] Before starting the cover slab concrete construction, the remaining water in the caisson 12 with the lowest bottom elevation must be completely drained; when pouring the cover slab concrete, a special person must be arranged to connect the self-priming pump with the laid PVC pipe 8 to suck out the seepage water in the pipe and discharge it to the outside of the cofferdam 11 to prevent it from flowing into the concrete being poured.

[0075] Step 7: PVC pipe 8 processing,

[0076] After the pouring and maintenance of the cover slab concrete are completed, the reserved PVC pipe 8 is raised to a position flush with the external water level through an external pipe connection to keep the internal and external water pressures consistent; finally, the grouting pipe is inserted into the bottom of the PVC pipe 8, and the grouting material labeled C40 is used for grouting sealing operations.

[0077] In order to ensure a close bond between new and old concrete, improve bonding strength, form a rough surface, and improve bonding strength, in the above embodiment, preferably: in the second step, during the roughening process of the bottom concrete structure of each caisson 12, the bottom concrete structure is roughened until coarse aggregate is exposed, and the exposed fresh concrete area should not be less than 75% of the total area.

[0078] In order to take into account both drainage and reducing the labor intensity of workers, in the above embodiment, preferably: the opening width of the 'V'-shaped water flow trough b9 and the "V"-shaped water flow trough a10 in the fourth step are both set to 15 cm, and the height is both set to 10 cm.

[0079] In order to take into account both drainage and load-bearing properties, that is, to facilitate the welding connection between the pipeline and the steel caisson and ensure that there is no invariance or displacement during concrete pouring, in the above embodiment, preferably: the pipeline in the fourth step adopts a φ48mm steel pipe.

[0080] For the convenience of material acquisition, in the above embodiment, preferably: the width of the steel plate 7 in the fifth step is 30 cm and the thickness is 6 mm; the height of the PVC pipe 8 is 5 m and the outer diameter is 10 cm, and a sealing pipe joint is provided at the top of the PVC pipe 8.

[0081] To ensure the thoroughness of drainage, in the above embodiment, preferably: the bottom end of the PVC pipe 8 is tightly against the top surface of the 'V'-shaped water flow trough b9.

[0082] To ensure sealing, in the above embodiment, preferably: the steel plate 7 is sealed to the PVC pipe 8, and the steel plate 7 is sealed to the 'V'-shaped water flow channel b9.

[0083] To facilitate fixing of the steel plate 7, in the above embodiment, preferably: triangular baffles 6 are provided at the two short sides of the steel plate 7, and both sides of the baffles 6 are sealed and compacted with C40 concrete.

[0084] In order to reduce the construction cost, in the above scheme, further: C40 concrete is used to seal the space between the steel plate 7 and the PVC pipe 8.

[0085] In order not to affect subsequent construction, in the above embodiment, preferably: the corresponding plugging measure in the first step refers to filling the surrounding area of ​​the leakage on the cofferdam 11 with a plugging agent, and sealing it with epoxy quick-drying cement to ensure that it can be cured in a short time.

[0086] In the above-mentioned implementation, the construction methods not explained were handled by existing conventional techniques.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for treating water seepage in a set-up caisson bottom seal concrete, characterized in that: The steps include: The first step is to pump out water and clean the cofferdam (11). After the bottom sealing concrete structure of each caisson (12) in the cofferdam (11) reaches the designed strength, a centrifugal pump is used to carry out a pumping operation in the cofferdam (11); during the pumping operation, the change of the water level in the cofferdam (11) is closely monitored so as to promptly determine whether there is leakage. Once leakage is found, corresponding plugging measures shall be taken immediately; When the water in the cofferdam (11) is pumped out to a remaining water depth of about 1 m, high-pressure water jetting is used to clean the mud and sand deposited on the well wall and the bottom concrete structure of each (12) until all the water in the cofferdam (11) is pumped out; The second step is to roughen the bottom concrete structure of each caisson (12). The bottom sealing concrete structure is roughened by mechanical roughening to remove cement mortar and loose layers on the surfaces of the well bottom sealing concrete (2), the well wall bottom sealing concrete (3) and the compartment bottom sealing concrete (4) in the bottom sealing concrete structure, and then the residues of the removed cement mortar and the loose layers are cleaned up, and finally rinsed with water; The third step is to inspect the quality of the bottom concrete structure of each caisson (12). Conduct a comprehensive inspection of the well bottom sealing concrete (2), the well wall bottom sealing concrete (3) and the compartment bottom sealing concrete (4) in the bottom sealing concrete structure in the second step to check whether there are any quality defects and whether there is any water leakage in the bottom sealing concrete structure; If there are no quality defects and no water leakage, proceed with the subsequent cover slab reinforcement construction and cover slab concrete pouring construction; If there are quality defects, that is, honeycomb-like holes on the surface of the well bottom concrete (2), the well wall bottom concrete (3) and the compartment bottom concrete (4) in the bottom concrete structure, the holes are cut into bell-shaped shapes, rinsed with water, and then repaired with 1:2 to 1:2.5 cement mortar, and then compacted with concrete of a higher grade, and maintenance is strengthened; If there is water leakage, carry out subsequent drainage and leakage treatment; The fourth step is drainage treatment. Drill a "V" shaped water flow channel to collect water in a single well. If the leakage in the leaking caisson (12) is located on one side of its wall plate, after the roughening treatment of the bottom concrete structure of each caisson (12) is completed in the second step, a "V"-shaped water flow channel a (10) is excavated along the side plate of the wall of the leaking caisson (12) using a pneumatic pick; If the leakage in the leaking caisson (12) is located in the middle of the caisson (12), in addition to the V-shaped water flow groove a (10) excavated along the side plate of the caisson wall, it is also necessary to excavate another V-shaped water flow groove b (9) of the same specification in the middle of the well hole bottom sealing concrete (2) of the leaking caisson (12) along the upstream and downstream direction of the water flow, and the V-shaped water flow groove b (9) and the V-shaped water flow groove a (10) are interconnected; Pipeline layout with multiple wells to collect water, During the process of the cover plate reinforcement construction, if the water leakage in the cofferdam (11) does not affect the normal construction, the leaking caissons (12) are connected to each other by using the pipes pre-buried in the compartment bottom sealing concrete (4) of each caisson (12), and the water flow is guided to converge to the caisson (12) with the lowest bottom sealing elevation of the well bottom sealing concrete (2) to form water accumulation; Drainage at the lowest point in the cofferdam (11) A water pump is arranged in the caisson (12) with the lowest bottom elevation, and the accumulated water is discharged in a centralized manner by the water pump, thereby ensuring a relatively dry construction environment; Step 5: Treat the leak. A steel plate (7) covering the V-shaped water flow trough b (9) is laid on the V-shaped water flow trough b (9) opened in the leaking caisson (12), a PVC pipe (8) is fixed on the steel plate (7), and the bottom end of the PVC pipe (8) is connected to the V-shaped water flow trough b (9); Step 6: Cover plate construction. Before starting the construction of the cover slab concrete, the remaining water in the caisson (12) with the lowest bottom elevation must be completely drained; when pouring the cover slab concrete, a dedicated person must be arranged to connect the self-priming pump to the laid PVC pipe (8) to suck out the seepage water in the pipe and discharge it to the outside of the cofferdam (11) to prevent it from flowing into the concrete being poured; Step 7: PVC pipe (8) processing, After the pouring and curing of the cover slab concrete are completed, the reserved PVC pipe (8) is raised to a position flush with the external water level through an external pipe connection so that the internal and external water pressures are kept consistent; finally, the grouting pipe is inserted into the bottom of the PVC pipe (8) and a grouting material with a label of C40 is used for grouting sealing.

2. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 1, characterized in that: In the second step, during the roughening treatment of the bottom concrete structure of each caisson (12), the roughening treatment of the bottom concrete structure is performed until the coarse aggregate is exposed, and the exposed fresh concrete area should not be less than 75% of the total area.

3. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 1, characterized in that: In the fourth step, the opening widths of the V-shaped water flow channel b (9) and the V-shaped water flow channel a (10) are both set to 15 cm, and the heights are both set to 10 cm.

4. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 1, characterized in that: The pipeline described in the fourth step is a φ48mm steel pipe.

5. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 1, characterized in that: In the fifth step, the width of the steel plate (7) is 30 cm and the thickness is 6 mm; the height of the PVC pipe (8) is 5 m and the outer diameter is 10 cm. A sealing pipe joint is provided at the top of the PVC pipe (8).

6. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 1 or 5, characterized in that: The bottom end of the PVC pipe (8) is tightly against the top surface of the 'V'-shaped water flow trough b (9).

7. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 1 or 5, characterized in that: The steel plate (7) is sealed to the PVC pipe (8), and the steel plate (7) is sealed to the 'V'-shaped water flow channel b (9).

8. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 7, characterized in that: Triangular baffles (6) are provided at the two short sides of the steel plate (7), and both sides of the baffles (6) are sealed and compacted with C40 concrete.

9. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 7, characterized in that: The space between the steel plate (7) and the PVC pipe (8) is sealed with C40 concrete.

10. The method for treating water seepage in the bottom seal concrete of a set-up caisson according to claim 1, characterized in that: The corresponding plugging measures in the first step refer to filling the area around the leaking part on the cofferdam (11) with a plugging agent and sealing it with epoxy quick-drying cement to ensure that it can be cured in a short time.

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