Underwater building surface defect repairing device and method

Abstract

The invention discloses an underwater building surface defect repairing device and method, and belongs to the technical field of defect repairing. The underwater building surface defect repairing device comprises an underwater positioning assembly and a defect covering mechanism; the defect covering mechanism comprises a defect covering box, a filling cavity is formed in the defect covering box, an injection nozzle and a discharge nozzle are installed on the upper portion and the lower portion of the defect covering box correspondingly, and ball valves are rotationally installed in the injection nozzle and the discharge nozzle correspondingly; and positioning seats matched with the underwater positioning assemblies for use are fixedly mounted at the four corners of the defect covering box, the defect covering box is attached to the surface of the underwater building in a sealed mode under the combined action of the four underwater positioning assemblies, and all defect parts on the surface of the underwater building are located in the filling cavity. After the device is mounted, water in the filling cavity is firstly discharged through the discharge nozzle, and then concrete is poured into the filling cavity through the injection nozzle, so that the defect part in the filling cavity is poured and covered, the defect part is prevented from being further corroded, and the device is very convenient to operate underwater.

Description

Technical Field

[0001] The present invention relates to the technical field of defect repair, and in particular to a device and method for repairing surface defects of an underwater building. Background Art

[0002] Underwater buildings refer to those structures that are partially or completely located below the water surface, such as bridges, submarine tunnels, underwater oil platform foundations, etc. Most of the important structures in such underwater buildings are composed of concrete components. During long-term use, due to the invasion of external factors such as wind and waves, corrosion, hydraulic scouring and temperature stress, the buildings will be defective or dented.

[0003] The existing method of repairing building surface defects is mainly to re-cast the defective location to prevent the defective location from continuing to corrode. However, this method is mainly applicable to buildings above water. For underwater buildings, it is extremely difficult to repair surface defects of underwater buildings because they are affected by underwater terrain, water flow impact and other environments. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for repairing surface defects of underwater buildings. After the device is installed, the water in the filling cavity is first discharged through the discharge nozzle, and then concrete is poured into the filling cavity through the injection nozzle, so that the defective parts in the filling cavity are cast and covered, thereby preventing the defective parts from being further corroded. It is very convenient when operating underwater.

[0005] To solve the above technical problems, the technical solution of the present invention is achieved as follows:

[0006] A device for repairing defects on the surface of an underwater building comprises four groups of underwater positioning components, which are clamped and fixed on the sides of the underwater building; a defect covering mechanism is fixedly installed on the four groups of underwater positioning components; the defect covering mechanism comprises a defect covering box, a filling cavity is provided inside the defect covering box, an injection nozzle and a discharge nozzle connected to the filling cavity are respectively installed at the upper and lower parts of the defect covering box, and ball valves are rotatably installed inside the injection nozzle and the discharge nozzle; positioning seats used in conjunction with the underwater positioning components are respectively fixedly installed at the four corners of the defect covering box, and the defect covering box is sealed and fitted to the surface of the underwater building under the joint action of the four groups of underwater positioning components, and all defective parts on the surface of the underwater building are located in the filling cavity; a main stirring rod is rotatably installed inside the filling cavity, a plurality of evenly distributed auxiliary stirring rods are fixed on the side wall of the main stirring rod, and a turning handle is concentrically fixed to the bottom of the main stirring rod.

[0007] By adopting the above scheme, after the device is installed, the water in the filling cavity is first discharged through the discharge nozzle, and then concrete is poured into the filling cavity through the injection nozzle, so that the defective parts in the filling cavity are poured and covered, thereby preventing the defective parts from being further corroded. It is very convenient when working underwater.

[0008] As a preferred embodiment of an underwater building surface defect repair device, a conversion tank is plugged into the mouth of the discharge nozzle, and a sealing ring is installed at the plug-in position between the discharge nozzle and the conversion tank; the capacity of the conversion tank is greater than the capacity of the filling cavity.

[0009] By adopting the above scheme, when the defect covering box is installed on an underwater building, there is water inside the filling cavity. In order to drain the water in the filling cavity, after connecting the conversion tank, the ball valve in the discharge nozzle is opened. At this time, the water in the filling cavity enters the conversion tank under the action of gravity, thereby completely draining the water in the filling cavity. In order to ensure the sealing of the plug-in, a sealing ring is installed to enhance the sealing between the discharge nozzle and the conversion tank.

[0010] As a preferred embodiment of the underwater building surface defect repairing device, a conduit is installed at the mouth of the injection nozzle, and a sealing ring is installed at the plugging position between the injection nozzle and the conduit.

[0011] By adopting the above scheme, after the water in the filling cavity is drained, the catheter is connected and the ball valve at the injection nozzle is opened. At this time, concrete is poured into the filling cavity through the catheter, thereby pouring and covering the defective parts in the filling cavity, thereby preventing the defective parts from being further corroded; in order to ensure the sealing of the plug-in, a sealing ring is installed to enhance the sealing between the injection nozzle and the catheter.

[0012] As a preferred embodiment of an underwater building surface defect repair device, the injection nozzle and the discharge nozzle are both equipped with nuts through threaded sealing; a locking needle is fixed inside the nut, and a slot for use with the locking needle is opened on the valve core surface of the ball valve; when the nut is fitted on the injection nozzle or the discharge nozzle, the locking needle is just inserted into the slot.

[0013] By adopting the above scheme, in order to further improve the sealing performance during subsequent reuse, a nut is added, and the ball valve is locked by a locking pin provided with the nut. At this time, the ball valve is in a closed state.

[0014] As a preferred embodiment of the underwater building surface defect repair device, the internal support of the filling cavity is fixed with multiple evenly distributed pillars.

[0015] By adopting the above scheme, in order to further improve the supporting effect in the filling cavity, a plurality of pillars are provided to support the filling cavity, thereby improving the stability and reliability of the filling cavity after being poured.

[0016] As a preferred embodiment of the underwater building surface defect repairing device, a sealing strip arranged around the filling cavity is bonded and fixed on the contact surface between the defect covering box and the underwater building.

[0017] In order to ensure the sealing performance by adopting the above scheme, a sealing strip is added to strengthen the sealing performance between the sink cover box and the surface of the underwater building.

[0018] As a preferred embodiment of an underwater building surface defect repair device, the underwater positioning assembly includes a positioning frame, a clamp seat 1 is fixed at one end of the positioning frame, a screw is rotatably installed at the end of the positioning frame away from the clamp seat 1, and a clamp seat 2 which is in the same straight line as the clamp seat 1 is fixed at the end of the screw.

[0019] By adopting the above scheme, in order to achieve the clamping and fixing of the underwater positioning component on the side of the underwater building, by rotating the screw, the defect covering mechanism can be firmly fixed to the surface of the underwater building under the joint clamping of the clamp seat 1 and the clamp seat 2.

[0020] As a preferred implementation of an underwater building surface defect repair device, a limiting groove is provided on the surface of the positioning seat, and the second clamping seat is clamped in the limiting groove.

[0021] By adopting the above scheme, in order to ensure the clamping effect, a limit groove is provided, and the clamping seat 2 is located in the limit groove during clamping, which can greatly improve the reliability of the positioning seat after being clamped.

[0022] A method for repairing surface defects of underwater buildings, the method adopts the underwater building surface defect repairing device for repairing, and the specific operation steps are as follows:

[0023] S1. First, four sets of underwater positioning components are installed and fixed. During installation, by rotating the screw, the underwater positioning components can be fastened to the side of the underwater building under the joint clamping of the clamp seat 1 and the clamp seat 2;

[0024] S2, then adjust the screw rod, place the positioning seat at the location of the second clamping seat, rotate the screw rod again, clamp the second clamping seat in the limiting groove, and the installation of the defect covering mechanism can be completed;

[0025] S3. Since water will enter the filling cavity during installation, in order to drain the water in the filling cavity, after connecting the conversion tank, open the ball valve in the discharge nozzle. At this time, the water in the filling cavity enters the conversion tank under the action of gravity, thereby completely draining the water in the filling cavity. After the water is drained, close the ball valve in the discharge nozzle and remove the conversion tank;

[0026] S4. After the water in the filling cavity is drained, the conduit is connected again, and the ball valve at the injection nozzle is opened. At this time, concrete is filled into the filling cavity through the conduit;

[0027] S5. After the concrete is poured, the main stirring rod and the auxiliary stirring rod can be driven to stir the concrete in the filling cavity by rotating the handle, so that the concrete is distributed more evenly in the filling cavity;

[0028] S6. After pouring is completed, the ball valve in the injection nozzle is closed and the catheter is removed. Since the defective part in the filling cavity is covered by the poured concrete, the defective part is prevented from being further corroded, and the surface defects of the underwater building can be repaired.

[0029] After adopting the above technical solution, the beneficial effects of the present invention are:

[0030] 1. After the device is installed, the water in the filling cavity is first discharged through the discharge nozzle, and then concrete is poured into the filling cavity through the injection nozzle, so that the defective parts in the filling cavity are poured and covered, thereby preventing the defective parts from being further corroded. It is very convenient when working underwater;

[0031] 2. When the defect covering box is installed on an underwater building, there is water inside the filling cavity. In order to drain the water in the filling cavity, after connecting the conversion tank, open the ball valve in the discharge nozzle. At this time, the water in the filling cavity enters the conversion tank under the action of gravity, thereby completely draining the water in the filling cavity; in order to ensure the sealing of the plug-in, a sealing ring is installed to enhance the sealing between the discharge nozzle and the conversion tank;

[0032] 3. After the water in the filling cavity is drained, connect the conduit and open the ball valve at the injection nozzle. At this time, concrete is poured into the filling cavity through the conduit to cover the defective parts in the filling cavity, thereby preventing the defective parts from being further corroded. In order to ensure the sealing of the plug-in, a sealing ring is installed to enhance the sealing between the injection nozzle and the conduit.

[0033] 4. In order to ensure that the concrete is distributed more evenly in the filling cavity, the main stirring rod and the auxiliary stirring rod can be driven to stir the concrete in the filling cavity by rotating the handle, so that the concrete is distributed more evenly in the filling cavity;

[0034] 5. In order to further improve the sealing performance during subsequent reuse, add a nut and lock the ball valve with the locking pin of the nut. At this time, the ball valve is in a closed state;

[0035] 6. In order to further improve the supporting effect in the filling cavity, multiple pillars are set to support the filling cavity, thereby improving the stability and reliability of the filling cavity after pouring;

[0036] 7. In order to achieve the clamping and fixing of the underwater positioning component on the side of the underwater building, the defect covering mechanism can be firmly fixed to the surface of the underwater building by rotating the screw and clamping the clamp seat 1 and the clamp seat 2 together; in order to ensure the clamping effect, a limit groove is opened, and the clamp seat 2 is located in the limit groove during clamping, which can greatly improve the reliability of the positioning seat after being clamped. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 The three-dimensional structure installed on the underwater building of the present invention Figure 1 ;

[0039] Figure 2 The three-dimensional structure installed on the underwater building of the present invention Figure 2 ;

[0040] Figure 3 for Figure 1 Three-dimensional structure of medium defect covering mechanism Figure 1 ;

[0041] Figure 4 for Figure 1 Three-dimensional structure of medium defect covering mechanism Figure 2 ;

[0042] Figure 5 For display Figure 1 The internal three-dimensional structure diagram when the water in the filling cavity is emptied;

[0043] Figure 6 for Figure 5 A partial enlarged view of the middle A;

[0044] Figure 7 For display Figure 1 The internal three-dimensional structure diagram when concrete is poured into the filling cavity;

[0045] Figure 8 for Figure 7 A partial enlarged view of point B in the middle;

[0046] Fig. 9 for Figure 1 The three-dimensional structure diagram after the concrete pouring is completed;

[0047] Fig.10 for Fig. 9 A partial enlarged view of point C in the middle;

[0048] Fig.11 for Fig. 9 A partial enlarged view of point D in the middle;

[0049] Fig.12 for Figure 1 Three-dimensional structure of underwater positioning components Figure 1 ;

[0050] Fig.13 for Figure 1 Three-dimensional structure of underwater positioning components Figure 2 ;

[0051] Markings in the figure: 1- underwater positioning assembly; 101- positioning frame; 102- clamp seat one; 103- screw; 104- clamp seat two; 2- underwater building; 3- defect covering mechanism; 301- defect covering box; 302- filling chamber; 303- discharge nozzle; 304- injection nozzle; 305- ball valve; 306- positioning seat; 307- limit groove; 308- conversion tank; 309- catheter; 310- sealing ring; 311- nut; 312- locking needle; 313- slot; 314- pillar; 315- sealing strip; 316- main stirring rod; 317- auxiliary stirring rod; 318- handle; 4- defect part. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] like Figures 1 to 11As shown, a device for repairing surface defects of underwater buildings comprises four groups of underwater positioning components 1, which are clamped and fixed on the side of an underwater building 2; a defect covering mechanism 3 is fixedly installed on the four groups of underwater positioning components 1; the defect covering mechanism 3 comprises a defect covering box 301, a filling cavity 302 is provided inside the defect covering box 301, an injection nozzle 304 and a discharge nozzle 303 connected to the filling cavity 302 are respectively installed at the upper and lower parts of the defect covering box 301, and a ball valve 304 and a discharge nozzle 303 are respectively rotatably installed inside the injection nozzle 304 and the discharge nozzle 303. 05; Positioning seats 306 used in conjunction with the underwater positioning assembly 1 are fixedly installed at the four corners of the defect covering box 301. Under the joint action of the four groups of underwater positioning assemblies 1, the defect covering box 301 is sealed and attached to the surface of the underwater building 2, and the defective parts 4 on the surface of the underwater building 2 are all located in the filling cavity 302; a main stirring rod 316 is rotatably installed inside the filling cavity 302, and a plurality of evenly distributed auxiliary stirring rods 317 are fixed on the side wall of the main stirring rod 316, and a turning handle 318 is concentrically fixed at the bottom of the main stirring rod 316. After the device is installed, the water in the filling cavity 302 is first discharged through the discharge nozzle 303, and then concrete is poured into the filling cavity 302 through the injection nozzle 304, so that the defective part 4 in the filling cavity 302 is poured and covered, thereby preventing the defective part 4 from being further corroded, which is very convenient when working underwater.

[0054] like Figure 5 to Figure 6 As shown, the mouth of the discharge nozzle 303 is plugged with a conversion tank 308, and a sealing ring 310 is installed at the plug-in position between the discharge nozzle 303 and the conversion tank 308; the capacity of the conversion tank 308 is greater than the capacity of the filling cavity 302. When the defect covering box 301 is installed on the underwater building 2, there is water inside the filling cavity 302. In order to empty the water in the filling cavity 302, after connecting the conversion tank 308, the ball valve 305 in the discharge nozzle 303 is opened, and the water in the filling cavity 302 enters the conversion tank 308 under the action of gravity, thereby completely emptying the water in the filling cavity 302; in order to ensure the sealing of the plug-in, a sealing ring 310 is installed to enhance the sealing between the discharge nozzle 303 and the conversion tank 308.

[0055] like Figures 7 and 8 As shown, a conduit 309 is installed at the mouth of the injection nozzle 304, and a sealing ring 310 is installed at the plugging position between the injection nozzle 304 and the conduit 309. When the water in the filling cavity 302 is emptied, the conduit 309 is connected, and the ball valve 305 at the injection nozzle 304 is opened. At this time, concrete is poured into the filling cavity 302 through the conduit 309, so that the defective part 4 in the filling cavity 302 is poured and covered, thereby preventing the defective part 4 from being further corroded; in order to ensure the sealing of the plugging, the sealing ring 310 is installed to enhance the sealing between the injection nozzle 304 and the conduit 309.

[0056] like Figure 3 to Figure 4 , Figures 9 to 11 As shown, the injection nozzle 304 and the discharge nozzle 303 are both equipped with a nut 311 through threaded sealing; wherein, a locking pin 312 is fixed inside the nut 311, and a slot 313 for use with the locking pin 312 is provided on the valve core surface of the ball valve 305; when the nut 311 is matched with the injection nozzle 304 or the discharge nozzle 303, the locking pin 312 is just inserted into the slot 313. In order to further improve the sealing performance during subsequent reuse, the nut 311 is added, and the ball valve 305 is locked by the locking pin 312 equipped with the nut 311, and the ball valve 305 is in a closed state at this time.

[0057] like Figure 4 As shown, the filling cavity 302 is supported internally by a plurality of evenly distributed pillars 314. In order to further enhance the supporting effect within the filling cavity 302, a plurality of pillars 314 are provided to support the filling cavity 302, thereby enhancing the stability and reliability of the filling cavity 302 after being poured.

[0058] like Figure 4 As shown, a sealing strip 315 arranged around the filling cavity 302 is bonded and fixed on the contact surface between the defect covering box 301 and the underwater building 2. In order to ensure the sealing, the sealing strip 315 is added to strengthen the sealing between the defect covering box and the surface of the underwater building 2.

[0059] like Figure 12 to Figure 13 As shown, the underwater positioning assembly 1 includes a positioning frame 101, a clamping seat 102 is fixed at one end of the positioning frame 101, a screw rod 103 is rotatably mounted on the end of the positioning frame 101 away from the clamping seat 102, and a clamping seat 2 104 which is in the same straight line as the clamping seat 102 is fixed at the end of the screw rod 103. In order to achieve the clamping and fixing of the underwater positioning assembly 1 on the side of the underwater building 2, by rotating the screw rod 103, the defect covering mechanism 3 can be firmly fixed to the surface of the underwater building 2 under the joint clamping of the clamping seat 102 and the clamping seat 2 104.

[0060] like Figure 3 , Figure 12 to Figure 13 As shown, the surface of the positioning seat 306 is provided with a limiting groove 307, and the clamping seat 104 is clamped in the limiting groove 307. In order to ensure the clamping effect, the limiting groove 307 is provided, and the clamping seat 104 is located in the limiting groove 307 during clamping, which can greatly improve the reliability of the positioning seat 306 after being clamped.

[0061] A method for repairing surface defects of underwater buildings, the method adopts the underwater building surface defect repairing device for repairing, and the specific operation steps are as follows:

[0062] S1. First, four sets of underwater positioning components 1 are installed and fixed. During installation, by rotating the screw 103, the underwater positioning components 1 can be fastened to the side of the underwater building 2 under the joint clamping of the clamp seat 1 102 and the clamp seat 2 104;

[0063] S2, then adjust the screw 103, place the positioning seat 306 where the clamp seat 104 is located, rotate the screw 103 again, and clamp the clamp seat 104 in the limiting groove 307 to complete the installation of the defect covering mechanism 3. Figure 1 to Figure 2 As shown;

[0064] S3. Since water will enter the filling chamber 302 during installation, in order to drain the water in the filling chamber 302, after connecting the conversion tank 308, open the ball valve 305 in the discharge nozzle 303. At this time, the water in the filling chamber 302 enters the conversion tank 308 under the action of gravity, thereby completely draining the water in the filling chamber 302. Figure 5 to Figure 6 As shown, after the water is drained, the ball valve 305 in the discharge nozzle 303 is closed and the conversion tank 308 is removed;

[0065] S4. After the water in the filling cavity 302 is drained, the conduit 309 is connected, and the ball valve 305 at the injection nozzle 304 is opened. At this time, concrete is filled into the filling cavity 302 through the conduit 309. Figures 7 and 8 As shown;

[0066] S5. After the concrete is filled, the main stirring rod 316 and the auxiliary stirring rod 317 can be driven to stir the concrete in the filling cavity 302 by rotating the handle 318, so that the concrete is distributed more evenly in the filling cavity 302;

[0067] S6, after the pouring is completed, the ball valve 305 in the injection nozzle 304 is closed and the conduit 309 is removed. Figures 9 to 11 As shown, since the defective portion 4 in the filling cavity 302 is covered by poured concrete, the defective portion 4 is prevented from being further corroded, and the surface defects of the underwater building 2 can be repaired.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for repairing surface defects of underwater buildings, comprising four sets of underwater positioning components, which are clamped and fixed on the sides of the underwater buildings; defect covering mechanisms are fixedly installed on the four sets of underwater positioning components; Features: The defect covering mechanism comprises a defect covering box, a filling cavity is provided inside the defect covering box, an injection nozzle and a discharge nozzle connected to the filling cavity are respectively installed at the upper and lower parts of the defect covering box, and ball valves are rotatably installed inside the injection nozzle and the discharge nozzle respectively; Positioning seats used in conjunction with underwater positioning components are fixedly installed at the four corners of the defect covering box. Under the joint action of the four groups of underwater positioning components, the defect covering box is sealed and attached to the surface of the underwater building, and all the defective parts on the surface of the underwater building are located in the filling cavity; A main stirring rod is rotatably mounted inside the filling cavity, a plurality of evenly distributed auxiliary stirring rods are fixed on the side wall of the main stirring rod, and a turning handle is concentrically fixed on the bottom of the main stirring rod.

2. The underwater building surface defect repairing device according to claim 1, characterized in that: A conversion tank is plugged into the mouth of the discharge nozzle, and a sealing ring is installed at the plugging position between the discharge nozzle and the conversion tank; the capacity of the conversion tank is greater than the capacity of the filling cavity.

3. The underwater building surface defect repairing device according to claim 2 is characterized in that: A conduit is installed at the mouth of the injection nozzle, and a sealing ring is installed at the plugging position between the injection nozzle and the conduit.

4. The underwater building surface defect repairing device according to claim 3 is characterized by: The injection nozzle and the discharge nozzle are both matched with nuts through threaded sealing.

5. The underwater building surface defect repairing device according to claim 4 is characterized in that: A locking needle is fixed inside the nut, and a slot for matching with the locking needle is provided on the surface of the valve core of the ball valve; when the nut is matched with the injection nozzle or the discharge nozzle, the locking needle is just inserted into the slot.

6. The underwater building surface defect repairing device according to claim 5, characterized in that: The filling cavity is internally supported and fixed with a plurality of pillars evenly distributed.

7. The underwater building surface defect repairing device according to claim 6, characterized in that: A sealing strip arranged around the filling cavity is bonded and fixed on the contact surface between the defect covering box and the underwater building.

8. The underwater building surface defect repairing device according to claim 7, characterized in that: The underwater positioning assembly comprises a positioning frame, one end of which is fixed with a clamp seat 1, the end of the positioning frame away from the clamp seat 1 is rotatably mounted with a screw, and the end of the screw is fixed with a clamp seat 2 which is in the same straight line as the clamp seat 1.

9. The underwater building surface defect repairing device according to claim 8, characterized in that: A limiting groove is provided on the surface of the positioning seat, and the second clamping seat is clamped in the limiting groove.

10. A method for repairing surface defects of underwater buildings, characterized in that: The method uses the underwater building surface defect repairing device according to claim 9 for repair, and the specific operation steps are as follows: S1. First, four sets of underwater positioning components are installed and fixed. During installation, the underwater positioning components can be fixed to the side of the underwater building by rotating the screw rod under the joint clamping of the clamp seat 1 and the clamp seat 2. S2, then adjust the screw rod, place the positioning seat at the location of the second clamping seat, rotate the screw rod again, clamp the second clamping seat in the limiting groove, and the installation of the defect covering mechanism can be completed; S3. Since water will enter the filling cavity during installation, in order to drain the water in the filling cavity, after connecting the conversion tank, open the ball valve in the discharge nozzle. At this time, the water in the filling cavity enters the conversion tank under the action of gravity, thereby completely draining the water in the filling cavity. After the water is drained, close the ball valve in the discharge nozzle and remove the conversion tank; S4. After the water in the filling cavity is drained, the conduit is connected again, and the ball valve at the injection nozzle is opened. At this time, concrete is filled into the filling cavity through the conduit; S5. After the concrete is poured, the main stirring rod and the auxiliary stirring rod can be driven to stir the concrete in the filling cavity by rotating the handle, so that the concrete is distributed more evenly in the filling cavity; S6. After pouring is completed, the ball valve in the injection nozzle is closed and the catheter is removed. Since the defective part in the filling cavity is covered by the poured concrete, the defective part is prevented from being further corroded, and the surface defects of the underwater building can be repaired.

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