A double-wall dry chamber cabin operation method for underwater concrete maintenance

Abstract

The present application belongs to the technical field of water conservancy project hub safety danger-removing and reinforcement, and discloses a double-wall dry chamber cabin operation method for underwater concrete maintenance, which adopts a double-wall dry chamber cabin repair equipment carried into water by a submersible and navigates to the underwater concrete to be maintained; after the repair equipment covers the place to be maintained, preliminary rubber water stop is performed, and then water in the outer cabin is pumped out and the inner cabin is inflated, so that a local dry environment relative to the outside is formed inside the repair equipment, which is convenient for the maintenance of the underwater concrete. On the one hand, the water pressure of the external water body on the cabin body is well utilized, the rubber water stop effect is better, and the overall stability is increased; on the other hand, the gas is well utilized to discharge the water in the inner cabin, so that a dry operation environment can be better realized; in addition, the cooperation of the above two aspects skillfully breaks through the water stop sealing problem under the condition of large water depth, and solves the maintenance demand problem under the condition of large water depth.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water conservancy project hub safety risk elimination and reinforcement, and particularly relates to a working method for underwater concrete maintenance. BACKGROUND

[0002] The flood discharge and energy dissipation buildings of water conservancy projects mainly include overflow dams (channels), water cushion ponds, discharge holes, hydraulic gates and the like. These buildings bear huge high-speed water flow impact force when the hydropower station is operated to discharge flood, and the concrete panels thereof are extremely prone to erosion, cavitation, abrasion, vibration damage, bottom plate splitting and fracture and the like under high-speed water flow. When the panels are damaged, the huge water flow impact will continuously scour the building foundation, and in severe cases, the dam foundation will be directly damaged. Once the discharge structure is damaged, it is a huge hidden danger to the safe operation of the entire water conservancy project, and with the continuous scouring of the foundation, major safety accidents such as dam breakage are extremely prone to occur, which will also seriously threaten the safety of life and property of the downstream cities and people.

[0003] In existing research and engineering practice, two repair methods are mainly used for the damaged bottom plate of the stilling basin: direct underwater repair and dry land operation repair. Each of the two repair methods has advantages and disadvantages. The direct underwater repair needs to process the damaged surface underwater, and then uses underwater concrete (epoxy resin and the like) to repair the damaged part. The advantage is that the water in the stilling basin does not need to be emptied, which can save the construction period, but the overall technical difficulty is great, the diving depth of the diver is limited, the repair cost is high, and the treatment effect is also poor, and secondary damage is extremely prone to occur in the later period. The dry land operation repair needs to completely pump out the water in the stilling basin to create a dry environment. The advantage is that the damaged part can be thoroughly processed, and the repaired structure can be integrated with the original structure, which is relatively solid and durable. However, the process is time-consuming and the economic cost is huge. Therefore, the research team proposes an underwater concrete damage dry land technology, which can create a local dry environment and well solve the shortcomings of the above two existing technologies.

[0004] Local dry land operation refers to using related equipment or cofferdams to enclose the damaged surface, and then pumping out the water in the cofferdams to form a local dry environment relative to the external water area, so that workers can enter the bottom plate for pretreatment and later repair. This method does not need to completely pump out the water in the stilling basin, but only needs to pump out the water in the cofferdams, which not only ensures the dry operation environment, but also relatively saves a large cost. The method of repairing the underwater damaged structure surface by local dry land operation will become an important direction of future research.

[0005] However, the previous technical solutions also have certain defects and deficiencies, mainly that the effect of the water stopping method is relatively poor, it is difficult to better realize the local dry environment, and has a bad influence on the construction operation and repair effect; in addition, the previous method is only suitable for shallow water conditions, and it is difficult to meet the maintenance requirements of deep water. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide a double-wall dry chamber operation method for underwater concrete maintenance, which can realize dry maintenance of underwater concrete without pumping out all the water in the water conservancy building structure to be maintained, but only pumping out the water in the double-wall dry chamber repair equipment, effectively shortening the construction period and achieving good construction quality. At the same time, the present application innovatively adopts the method of pumping water in the outer chamber and inflating the inner chamber. On the one hand, the water pressure of the external water body on the chamber body is well utilized by pumping water in the outer chamber, which can make the double-wall dry chamber repair equipment and the concrete adhere more closely, the rubber water stopping effect is better, and the overall stability of the repair equipment is increased. It does not need to rely on a large amount of counterweight to make the repair equipment and the underwater structure surface achieve better adhesion, which can reduce the overall weight and material of the equipment and save costs; on the other hand, the outer chamber inflating the inner chamber well utilizes the water body outside the inner chamber, which can better realize the dry operation environment of the inner chamber; in addition, the cooperation of the above two aspects ingeniously solves the problem of water stopping and sealing under the condition of deep water, and solves the problem of maintenance under the condition of deep water.

[0007] In order to solve the above technical problems, the present application is realized by the following technical scheme:

[0008] The present application provides a double-wall dry chamber operation method for underwater concrete maintenance, which adopts a double-wall dry chamber repair equipment carried into water by a submersible and navigates to the underwater concrete to be maintained; after the double-wall dry chamber repair equipment is covered, rubber preliminary water stopping is performed, and then water is pumped out of the outer chamber and the inner chamber is inflated, so that a local dry environment is formed inside the double-wall dry chamber repair equipment relative to the outside, which is convenient for the maintenance of underwater concrete.

[0009] The double-wall dry chamber repair equipment includes an outer chamber and an inner chamber, the outer chamber is directly in contact with the external water body, and the inner chamber is arranged inside the outer chamber; the outer chamber and the inner chamber are connected by a submersible connecting section, and the submersible connecting section is arranged at the top of the outer chamber and the inner chamber; the top of the submersible connecting section is provided with a connecting flange, and the submersible connecting section is connected with the submersible through the connecting flange;

[0010] The outer cabin bottom is provided with an outer cabin apron, the bottom surface of the outer cabin apron is provided with at least two D-shaped water-stopping rubbers, the outer edge of the outer cabin apron is provided with an outer VA-shaped water-stopping rubber; the upper part of the outer cabin apron is provided with a pump chamber, the pump chamber is internally provided with a water pump, the water pump is connected with a drain pipe and a water suction pipe, the drain pipe passes through the pump chamber and is connected with an external water body, the drain pipe is provided with a one-way check valve; the water suction pipe passes through the outer cabin and reaches the inside of the outer cabin; the D-shaped water-stopping rubber, the outer VA-shaped water-stopping rubber and the water pump provide an outer water-stopping barrier for the inner cabin.

[0011] The inner cabin can cover the concrete to be repaired underwater; the bottom outer edge of the inner cabin is provided with an inner VA-shaped water-stopping rubber, and the inflation of the inner cabin and the inner VA-shaped water-stopping rubber form an inner water-stopping barrier.

[0012] Further, a plurality of water pumps are uniformly arranged around the inner cabin in the circumferential direction.

[0013] Further, support rib plates are arranged between the inner cabin and the outer cabin, and a plurality of support rib plates are uniformly arranged around the inner cabin in the circumferential direction.

[0014] Further, a fixed inflation pipe is arranged inside the submersible connecting section, the outlet of the inflation pipe extends to the inside of the inner cabin, and the inlet of the inflation pipe is connected with a compressor or an air pump in the submersible.

[0015] Further, the method comprises the following steps:

[0016] (1) The double-wall dry chamber cabin repair equipment is made to sit on the bottom around the concrete to be repaired by carrying and angle adjustment of the submersible, and the outer VA-shaped water-stopping rubber, the D-shaped water-stopping rubber and the inner VA-shaped water-stopping rubber are brought into contact with the surface of the underwater concrete.

[0017] (2) after the outer layer VA type waterstop rubber, the D type waterstop rubber, the inner layer VA type waterstop rubber are completely attached to the surface of the underwater concrete, and the double-wall dry chamber cabin repair equipment is stable as a whole, the water in the outer cabin is pumped to the outside water body by the water pump; at this time, under the action of water pumping, the upper part of the outer cabin gradually forms a negative pressure state relative to the outside water body, so that the double-wall dry chamber cabin repair equipment is subjected to the pressure of the outside water body, and the outer layer VA type waterstop rubber, the D type waterstop rubber, the inner layer VA type waterstop rubber are further compressed; at the same time, the inner cabin is slowly inflated; with the entry of the gas, the pressure inside the inner cabin gradually rises, so that the water inside is gradually pressed into the outer cabin and pumped away by the water pump; due to the effect of inflation, the upper part of the inner cabin forms a positive pressure state, so that the double-wall dry chamber cabin repair equipment is subjected to the jacking force of the internal gas, and the water pumping rate is controlled to be greater than the inflation rate to ensure that the pressure of the repair equipment received from the outside water body is always greater than the jacking force of the internal gas, thereby realizing the adsorption of the repair equipment at the damaged surface and ensuring the underwater stability; until the water in the inner cabin is completely drained, and the air pressure in the inner cabin is sufficient to resist the external water pressure, the inflation is stopped when the outside water body cannot enter the inner cabin; when the water level in the outer cabin is lower than the water pumping requirement water level of the water pump, the water pumping is stopped.

[0018] Further, after the inflation is stopped in step (2), the air pressure in the inner cabin is controlled to be constant in real time; and the water level in the outer cabin is controlled by the water pump to be always lower than the water pumping requirement water level of the water pump.

[0019] The beneficial effects of the present application are:

[0020] (1) The present application innovatively adopts the operation method of outer cabin water pumping and inner cabin inflation, which can make good use of the water pressure of the outside water body on the cabin body, so that the double-wall dry chamber cabin is attached more closely to the concrete, the rubber waterstop plays a greater role, and the stability of the whole device is increased. The device can be attached to the underwater structure surface without relying on a large amount of counterweight, which can reduce the overall weight and material of the device and save costs; on the other hand, the gas is used to expel the water in the inner cabin, which can better realize the dry operation environment of the inner cabin.

[0021] (2) The present application ingeniously combines the methods of outer cabin water pumping, inner cabin inflation and rubber waterstop, which can better solve the problem of waterstop sealing under large water depth conditions, solve the problem of maintenance under large water depth conditions, effectively shorten the construction period, reduce the construction cost, and ensure the repair quality. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The overall structure of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application is shown in the figure;

[0023] Figure 2 A top view of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application;

[0024] Figure 3 A sectional perspective view of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application;

[0025] Figure 4 A sectional front view of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application;

[0026] Figure 5 An internal perspective view of the outer cabin of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application;

[0027] Figure 6 An internal top view of the outer cabin of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application;

[0028] Figure 7 An internal layout perspective view of the pump chamber of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application;

[0029] Figure 8 An internal layout top view of the pump chamber of the double-wall dry chamber cabin repair equipment provided by the embodiment of the present application;

[0030] Figure 9 A connection diagram of the double-wall dry chamber cabin repair equipment and the submersible provided by the embodiment of the present application.

[0031] In the above figures: 1, outer cabin, 2, drain pipe, 3, pump chamber, 4, outer layer VA type water stop rubber, 5, submersible connection section, 6, connection flange, 7, inner cabin, 8, D type water stop rubber, 9, inner layer VA type water stop rubber, 10, water suction pipe, 11, outer cabin apron, 12, water suction pump, 13, support rib plate, 14, submersible. DETAILED DESCRIPTION

[0032] In order to further understand the content, characteristics and effects of the present application, the following embodiments are exemplified and described in detail as follows in combination with the drawings:

[0033] The embodiment provides a double-wall dry chamber cabin operation method for underwater concrete maintenance. The method adopts the double-wall dry chamber cabin repair equipment carried into water by the submersible 14 and navigates to the underwater concrete to be maintained. After the double-wall dry chamber cabin repair equipment is covered at the place to be maintained, preliminary rubber water stop is performed, and then the outer cabin 1 is watered and the inner cabin 7 is inflated, so that a local dry environment is formed inside the double-wall dry chamber cabin repair equipment relative to the outside, and the underwater concrete is maintained.

[0034] As Figures 1 to 4As shown, the double-wall dry chamber cabin repair equipment for underwater concrete maintenance is mainly composed of an outer cabin 1, a drain pipe 2, a pump chamber 3, an outer layer VA type water stop rubber 4, a submersible connecting section 5, a connecting flange 6, an inner cabin 7, a D type water stop rubber 8, an inner layer VA type water stop rubber 9, a water pumping pipe 10, an outer cabin skirt plate 11, a water pumping pump 12 and a support rib plate 13.

[0035] The outer cabin 1 is directly in contact with the external water body, and needs to meet the bearing capacity requirements of the external water pressure and the inner cabin 7 conducted air pressure, and a circular hole is formed at the top of the outer cabin 1 and the submersible connecting section 5 is connected at the circular hole.

[0036] The submersible connecting section 5 is provided with the connecting flange 6 at the top, and the whole repair equipment is connected with the submersible 14 through the connecting flange 6, and at the same time, the connecting flange 6 provides a passage for other equipment, pipes and construction.

[0037] The outer cabin 1 is provided with the outer cabin skirt plate 11 at the bottom, and the outer cabin skirt plate 11 is a flat plate structure which is closed around the outer cabin 1. The bottom surface of the outer cabin skirt plate 11 is provided with at least two D type water stop rubbers 8, and the outer edge of the outer cabin skirt plate 11 is provided with the outer layer VA type water stop rubber 4.

[0038] The upper part of the outer cabin skirt plate 11 is provided with the pump chamber 3, and the pump chamber 3 is a cavity structure. The pump chamber 3 is internally provided with the water pumping pump 12, and a plurality of water pumping pumps 12 are arranged uniformly around the outer cabin 1. In application, the specific number of the water pumping pump 12 can be determined according to actual requirements. The main function of the water pumping pump 12 is to pump out the water in the hollow sandwich structure composed of the outer cabin 1, the support rib plate 13 and the inner cabin 7 and the water discharged outside the inner cabin 7. The water pumping pump 12 is connected with the drain pipe 2 and the water pumping pipe 10, the drain pipe 2 passes through the pump chamber 3 and is connected with the external water body, and the drain pipe 2 is provided with a one-way check valve to prevent the external water body from flowing back to the outer cabin 1; the water pumping pipe 10 passes through the outer cabin 1 and reaches the inside of the outer cabin 1.

[0039] The D type water stop rubber 8, the outer layer VA type water stop rubber 4, the water pumping pump 12 and the drain pipe 2 and the water pumping pipe 10 comprehensively provide an outer water stop barrier for the inner cabin 7.

[0040] The inner cabin 7 is arranged inside the outer cabin 1, and needs to meet the bearing capacity requirements of the water pressure and the internal air pressure conducted by the outer cabin 1, and a circular hole is formed at the top of the inner cabin 7 and the submersible connecting section 5 is connected through the circular hole. The support rib plate 13 is arranged between the inner cabin 7 and the outer cabin 1, and a plurality of support rib plates 13 are arranged uniformly around the inner cabin 7, which is used to strengthen the bearing capacity of the outer cabin 1 and the solidity of the whole equipment. At the same time, the outer cabin 1 is connected and fixed with the inner cabin 7 through the submersible connecting section 5 and the support rib plate 13.

[0041] The bottom outer edge of the cover of the inner cabin 7 is provided with an inner layer VA type water stop rubber 9, and the inflation of the inner cabin 7 and the inner layer VA type water stop rubber 9 form an inner layer water stop barrier. The required gas of the inner cabin 7 is provided by the submersible 14, and a fixed inflation pipeline is arranged inside the connecting section 5 of the submersible, the inlet of the inflation pipeline is connected with a compressor or air pump in the submersible 14, and the outlet extends to the inside of the inner cabin 7.

[0042] The inner cabin 7 can cover the underwater concrete to be repaired, and the water in the inner cabin 7 is squeezed out in an inflated manner, so as to finally provide a dry working environment for the repair of the underwater concrete.

[0043] Based on the double-wall dry chamber cabin repair equipment, the double-wall dry chamber cabin operation method for underwater concrete repair of the embodiment specifically includes the following steps:

[0044] (1) The double-wall dry chamber cabin repair equipment is seated on the bottom, and the rubber preliminary water stop is performed.

[0045] Through the carrying and angle fine adjustment of the submersible 14, the double-wall dry chamber cabin repair equipment is seated on the bottom around the underwater concrete to be repaired, and the outer layer VA type water stop rubber 4, the D type water stop rubber 8 and the inner layer VA type water stop rubber 9 are in contact with the surface of the underwater concrete, and the preliminary rubber compression and water stop work are completed by relying on the self-weight of the whole double-wall dry chamber cabin repair equipment in water.

[0046] (2) The outer cabin 1 is pumped, and the inner cabin 7 is inflated.

[0047] After the outer layer VA type water stop rubber 4, the D type water stop rubber 8 and the inner layer VA type water stop rubber 9 are completely attached to the surface of the underwater concrete, and the whole double-wall dry chamber cabin repair equipment is stable, the water pump 12 in the pump chamber 3 is started to pump the water in the outer cabin 1 to the outside water body. The stability of the whole double-wall dry chamber cabin repair equipment can be judged by the displacement sensor installed on the double-wall dry chamber cabin repair equipment.

[0048] At this time, under the action of pumping, the upper part of the outer cabin 1 gradually forms a negative pressure state relative to the outside water body, and due to the existence of the negative pressure, the double-wall dry chamber cabin repair equipment is subjected to the water pressure of the outside water body perpendicular to the cabin wall, at the same time, the outer layer VA type water stop rubber 4, the D type water stop rubber 8 and the inner layer VA type water stop rubber 9 of the double-wall dry chamber cabin are further compressed, the contact surface of the outer layer VA type water stop rubber 4, the D type water stop rubber 8 and the inner layer VA type water stop rubber 9 with the underwater concrete is further increased, and the water stop effect is also improved.

[0049] When the water in the outer cabin 1 is pumped out, the inner cabin 7 is slowly inflated by the air compressor or air pump in the submersible 14. The gas slowly occupies the inner space of the inner cabin 7, and the water in the inner cabin 7 is forced into the outer cabin 1 and pumped out by the water pump 12. Due to the effect of inflation, the upper part of the inner cabin 7 forms a positive pressure state, so that the double-wall dry chamber cabin repair equipment is subjected to the internal gas jacking force. The water pumping rate is controlled to be greater than the inflation rate to ensure that the repair equipment is always subjected to external water pressure greater than the internal gas jacking force, thereby realizing the adsorption of the repair equipment at the damaged surface and ensuring the underwater stability of the equipment. When the water in the inner cabin 7 is completely drained and the air pressure in the inner cabin is sufficient to resist the external water pressure (i.e. the internal air pressure is equal to the external water pressure), the inflation of the inner cabin 7 is stopped. When there is little water in the outer cabin 1 and the water level is lower than the water pumping requirement of the water pump 10, the water pumping is stopped.

[0050] The external water pressure on the outer cabin 1 and the gas jacking force on the inner cabin 7 can be identified and judged by the pressure sensor installed on the double-wall dry chamber cabin repair equipment. In addition, the water level in the outer cabin 1 can be judged by the water level sensor installed on the double-wall dry chamber cabin repair equipment.

[0051] After the above operation, a local dry environment is formed in the inner cabin 7 of the double-wall dry chamber cabin repair equipment relative to the external water body, so that the underwater concrete can be inspected and repaired by researchers and construction personnel. During the maintenance process, the air pressure in the inner cabin 7 should be controlled to remain constant. If the pressure drops, it should be supplemented in time. If the water seeps into the outer cabin 1, when the water level in the outer cabin 1 is slightly higher than the water pumping requirement of the water pump 10, the water pump 12 is started to pump out the water in the outer cabin 1, and the water level in the outer cabin 1 is always kept lower than the water pumping requirement of the water pump.

[0052] Although the preferred embodiments of the present application are described above with reference to the accompanying drawings, the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative and not limiting. Those skilled in the art can make many specific changes to the embodiments without departing from the spirit and scope of the application and the scope of protection claimed by the claims, which are all within the scope of protection of the present application.

Claims

1. A method for dry chamber double-walled chamber work for underwater concrete inspection, characterized by, The method adopts a double-wall dry chamber cabin repair equipment carried into water by a submersible and navigates to the underwater concrete to be repaired; the double-wall dry chamber cabin repair equipment is covered at the to-be-repaired position, rubber preliminary water stop is performed, water in the outer cabin is pumped out, and the inner cabin is inflated, so that a local dry environment is formed inside the double-wall dry chamber cabin repair equipment relative to the outside, and the underwater concrete is repaired; The double-wall dry chamber cabin repair equipment comprises an outer cabin and an inner cabin, the outer cabin is directly contacted with the water outside, and the inner cabin is arranged inside the outer cabin; The outer cabin and the inner cabin are connected through a submersible connecting section, the submersible connecting section is arranged at the top of the outer cabin and the inner cabin; a connecting flange is arranged at the top of the submersible connecting section, and the submersible connecting section is connected with the submersible through the connecting flange; An outer cabin apron is arranged at the bottom of the outer cabin, at least two D-shaped water stop rubbers are arranged on the bottom surface of the outer cabin apron, and an outer layer VA-shaped water stop rubber is arranged at the outer edge of the outer cabin apron; a pump chamber is arranged at the upper portion of the outer cabin apron, a water pump is arranged in the pump chamber, the water pump is connected with a drainage pipe and a water suction pipe, the drainage pipe passes through the pump chamber and is connected with the water outside, and a one-way check valve is arranged on the drainage pipe; the water suction pipe passes through the outer cabin and reaches the inside of the outer cabin; the D-shaped water stop rubber, the outer layer VA-shaped water stop rubber and the water pump provide an outer water stop barrier for the inner cabin. The inner cabin can cover the to-be-repaired position of the underwater concrete; an inner layer VA-shaped water stop rubber is arranged at the outer edge of the bottom of the inner cabin, and the inflation of the inner cabin and the inner layer VA-shaped water stop rubber form an inner water stop barrier.

2. A method for dry chamber dual wall chamber operations for underwater concrete inspection according to claim 1, characterized in that, A plurality of water pumps are arranged around the inner cabin in a uniform manner in the circumferential direction.

3. A method for dry chamber dual wall chamber operations for underwater concrete inspection as claimed in claim 1, wherein, Supporting rib plates are arranged between the inner cabin and the outer cabin, and a plurality of supporting rib plates are arranged around the inner cabin in a uniform manner in the circumferential direction.

4. A method for dry chamber dual wall chamber operations for underwater concrete inspection as claimed in claim 1, wherein, A fixed inflation pipeline is arranged in the inner side of the submersible connecting section, the outlet of the inflation pipeline extends to the inside of the inner cabin, and the inlet of the inflation pipeline is connected with a compressor or an air pump in the submersible.

5. A method of working in a dry chamber of a double-walled chamber for underwater concrete repair according to any one of claims 1-4, characterized in that, The method comprises the following steps: (1) The double-wall dry chamber cabin repair equipment is bottomed around the to-be-repaired position of the concrete through the carrying and angle adjustment of the submersible, and the outer layer VA-shaped water stop rubber, the D-shaped water stop rubber and the inner layer VA-shaped water stop rubber are contacted with the surface of the underwater concrete; (2) After the outer layer VA type waterstop rubber, the D type waterstop rubber, the inner layer VA type waterstop rubber and the surface of underwater concrete are completely attached, and the whole double-wall dry chamber cabin repair equipment is stable, the water in the outer cabin is pumped to the outside water body by the water pump; at this time, under the action of pumping water, the upper part of the outer cabin gradually forms a negative pressure state relative to the outside water body, so that the double-wall dry chamber cabin repair equipment is subjected to the pressure of the outside water body, and the outer layer VA type waterstop rubber, the D type waterstop rubber and the inner layer VA type waterstop rubber are further compressed; at the same time, the inner cabin is slowly inflated; with the entry of gas, the pressure inside the inner cabin gradually rises, so that the water inside it is gradually pressed into the outer cabin and pumped away by the water pump; due to the effect of inflation, the upper part of the inner cabin forms a positive pressure state, so that the double-wall dry chamber cabin repair equipment is subjected to the jacking force of the internal gas, and the pumping rate is greater than the inflation rate in this process, so as to ensure that the pressure of the repair equipment received from the outside water body is always greater than the jacking force of the internal gas, thereby realizing the adsorption of the repair equipment at the damaged surface and ensuring the underwater stability; until the water in the inner cabin is completely drained, and the air pressure in the inner cabin is enough to resist the external water pressure, so that the external water body cannot enter the inner cabin, stop inflating; when the water level in the outer cabin is lower than the required water level of the water pump, stop pumping.

6. A method of working in a dry chamber of a double-walled chamber for underwater concrete repair according to claim 5, characterized in that, After stopping inflation in step (2), the air pressure in the inner cabin is kept constant in real time; and the water level in the outer cabin is kept lower than the required water level of the water pump by the water pump.

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