Leaking stoppage method for confined water area enclosure structure

Abstract

The invention relates to the technical field of building construction, in particular to a confined water area enclosure structure leaking stoppage method, which comprises the following steps of: chiseling a leakage opening in a leakage point area, filling a sponge structure wrapped with a grouting pipe, spot-welding a plugging steel plate with a water drain pipe, and performing low-pressure small-amount grouting to form an outer plugging belt of the structure. The plugging belt is pushed into the seepage opening through water pressure so as to gradually shrink the seepage opening, and then a plugging steel plate is fully welded to plug the periphery; finally, the grouting pressure is increased, so that the sponge structure fully absorbs the liquid medicine, and the sponge structure swells together to fill and compact the soil in the loose area; and then the flow guide pipe is blocked by a conical steel column, and final operation is completed. According to the method, the problem that no counter-acting force exists during soil loss outside the structure is solved, water pressure can be reduced, liquid medicine loss can be reduced, time is provided for liquid medicine expansion, and the purposes of tight plugging and ground collapse and cracking prevention are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for plugging leakage of a pressurized water area enclosure structure. Background Art

[0002] With the continuous development of urban construction, the development and utilization of underground space is becoming more and more extensive. In underground projects, the geological environment in different regions is different, and the foundation pit retaining system (such as underground continuous wall, cast-in-place piles, etc.) usually passes through the pressurized water area. The construction of retaining structures in pressurized water areas is difficult, and it is very easy to leak retaining structures, which brings hidden dangers to the safety and use function of the retaining system. At present, the conventional methods for plugging leaks in retaining structures in pressurized water areas are mainly: 1. Use high-pressure rotary jet grouting to plug leaks on the outside of the foundation pit; 2. Injection grouting (chemical grouting resin, foamed polyurethane and other materials) at the leakage site in the foundation pit.

[0003] However, the above methods all have some problems in practical application. Method 1: It is difficult to control the depth and position of grouting, and due to the presence of pressurized water, pipe bursts are very likely to occur inside the pit, resulting in soil loss on the outer side of the structure, forming voids and gaps. When the soil on the surface is loose, there is a lack of soil reaction force, making it difficult to effectively fix the grouting plugging layer and achieve effective plugging. Secondly, grouting in deeper groundwater areas is prone to water resource pollution; Method 2: Due to the high water pressure, the water-expanding liquid is easy to be directly lost, and it is difficult to expand in time to form a plug. Secondly, the soil on the surface is loose and forms voids. It is difficult to expand and fill it all densely by simply injecting liquid, which can easily lead to hidden dangers such as ground cracks. Finally, conventional plugging methods often take a long time and high cost, and the effect is not ideal. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention discloses a method for plugging leakage of a containment structure in a pressurized water area, so as to solve the problem in the prior art that leakage of the containment system in a pressurized water area is difficult to plug.

[0005] A method for plugging leaks in a pressurized water area enclosure structure, comprising the following steps:

[0006] Find out the leakage points of the enclosure structure and excavate the leakage areas to form leakage openings;

[0007] Providing a sponge structure and at least four grouting pipes, and wrapping the liquid outlet ends of the at least four grouting pipes into the sponge structure, and filling the sponge structure wrapped with the grouting pipes from the leakage port to the soil facing surface of the enclosure structure;

[0008] A plugging steel plate matching the size of the leakage port is provided, and at least four drainage pipes are provided through the plugging steel plate. The plugging steel plate is respectively sleeved on the grouting pipe through each of the pressure relief pipes, and the plugging steel plate is spot welded to the steel bars around the leakage port;

[0009] Low-pressure grouting is performed into the sponge structure through the grouting pipe to form a plugging zone in the sponge structure, and the grouting liquid enters the leakage port under the action of water pressure and drains water through the gap between the grouting pipe and the drain pipe;

[0010] Fully weld the sealing steel plate to the surrounding side walls of the leakage port, and seal the surrounding areas of the sealing steel plate;

[0011] Increasing the grouting pressure, and after the sponge structure forms a water-impermeable sponge liquid expansion body and is squeezed and compacted with the surrounding soil, stopping the grouting and pulling out the grouting pipe;

[0012] And after the drain pipe stops draining water, the drain pipe is blocked.

[0013] In some embodiments, the sponge structure is a sponge wrapped with hemp fibers.

[0014] In some of the embodiments, the grouting pipe is a plastic hose.

[0015] In some embodiments, the thickness of the blocking steel plate is 4 to 6 mm.

[0016] In some of the embodiments, the grouting liquid is foamed polyurethane or epoxy resin.

[0017] In some of the embodiments, the inner diameter of the grouting pipe is 7-9 mm, and the inner diameter of the drain pipe is 32-38 mm.

[0018] In some of the embodiments, the length of the drain pipe exposed on both sides of the sealing steel plate is not less than 100 mm.

[0019] In some embodiments, the process of plugging the drain pipe includes:

[0020] A conical steel column is driven into the drain pipe, and after the conical steel column and the drain pipe are fixed by spot welding, the conical steel column and the drain pipe are fully welded to complete the plugging of the drain pipe.

[0021] In some of the embodiments, a leak stopper is used to seal the surrounding areas of the sealing steel plate.

[0022] In some of these embodiments, the enclosure structure is a continuous wall.

[0023] Compared with the prior art, the above invention has one of the following advantages or beneficial effects:

[0024] 1. The present invention solves the problem of leakage and plugging of the enclosure structure in the pressurized water area, and avoids the risk of soil loss, surface settlement and cracking caused by leakage in the pressurized water area.

[0025] 2. The present invention forms a sealing belt outside the structure by low-pressure grouting first, and uses the reverse thrust of water pressure to make the grouting liquid flow into the leakage port to reduce the leakage point, providing time and space for the expansion of the liquid medicine, achieving the purpose of dense sealing, and thus solving the problem of liquid medicine expansion without soil constraints.

[0026] 3. The present invention reduces the loss of liquid medicine by draining water, improves the plugging effect and efficiency, and uses plugging steel plates to assist in maximizing the external expansion pressure of the structure, filling the space for soil loss and reducing surface damage.

[0027] 4. The method of the present invention is simple and easy to implement, has low cost, does not require special equipment and materials, and is easy to promote and apply.

[0028] 5. The method of the present invention is environmentally friendly and will not cause pollution or damage to the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and emphasis is placed on illustrating the subject matter of the present invention.

[0030] Figure 1 It is a flow chart of a method for plugging leakage of a retaining structure in a pressurized water area according to an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a structure for finding leakage points of a containment structure in a pressurized water area according to an embodiment of the present invention;

[0032] Figure 3 It is a structural schematic diagram of filling the sponge structure wrapped with the grouting pipe from the leakage port to the soil facing surface of the enclosure structure in an embodiment of the present invention;

[0033] Figure 4 It is a structural schematic diagram of spot welding the plugging steel plate to the steel bars around the leakage opening in an embodiment of the present invention;

[0034] Figure 5 This is a front view of a blocking steel plate in an embodiment of the present invention;

[0035] Figure 6 It is a structural schematic diagram of grouting by using a grouting machine in an embodiment of the present invention;

[0036] Figure 7 A schematic diagram of the structure of pulling out the grouting pipe in an embodiment of the present invention

[0037] Figure 8 It is a structural schematic diagram of blocking a drain pipe in an embodiment of the present invention;

[0038] Among them: 1 is the enclosure structure; 11 is the leakage point; 12 is the leakage port; 2 is the sponge structure; 2' is the sponge liquid expansion body; 3 is the grouting pipe; 4 is the sealing steel plate; 5 is the pressure relief pipe; 6 is the grouting machine; 7 is the conical steel column. DETAILED DESCRIPTION

[0039] The present invention is further described below with reference to the accompanying drawings and specific embodiments, but is not intended to be a limitation of the present invention.

[0040] like Figure 1 As shown, this embodiment discloses a method for plugging leakage in a pressurized water area enclosure structure. The enclosure structure 1 is a continuous wall, etc. The present invention is described with the enclosure structure 1 being a continuous wall. Specifically, the plugging leakage method includes the following steps:

[0041] Step S1, find the leakage point 11 of the enclosure structure 1, such as Figure 2 As shown, the concrete in the leakage area is chiseled off until the steel bars around the leakage area are exposed, and the leakage point area is chiseled to form a leakage opening 12.

[0042] Step S2, provide a sponge structure 2 and four grouting pipes 3, and wrap the liquid outlet ends of the four grouting pipes 3 into the sponge structure 2, and fill the sponge structure 2 wrapped with the grouting pipes 3 from the leakage port 12 to the soil surface of the enclosure structure 1 (that is, fill the sponge structure 2 wrapped with the grouting pipes 3 to the position adjacent to the leakage port 12 in the pressurized water area); the number of grouting pipes 3 is determined according to the water pressure and the area of ​​the leakage point 11. In principle, there are at least two grouting pipes above and below the leakage point 11. Specifically, the sponge structure 2 is a sponge wrapped with hemp fibers, and the grouting pipes 3 are plastic hoses. The inner diameter of the grouting pipe 3 is 7 to 9 mm (for example, 7 mm, 8 mm, 8.5 mm or 9 mm, etc.). The reason for using a sponge wrapped with hemp fibers is that the sponge has good water permeability and toughness, does not affect the change of water pressure, and can effectively prevent soil loss. Specifically, the sponge filling amount is determined according to the size of the leakage, the duration and the amount of quicksand produced; such as Figure 3 shown.

[0043] Step S3, provide a plugging steel plate 4 that matches the size of the leakage port 12, and four drain pipes 5 are provided through the plugging steel plate 4 (specifically, four drain pipe installation holes are provided on the plugging steel plate 4, and the four drain pipes 5 are fully welded in the four downpipe installation holes respectively), and respectively sleeve the plugging steel plate 4 on the grouting pipe 3 through each drain pipe 5, and spot weld the plugging steel plate 4 to the steel bars around the leakage port 12. The thickness of the plugging steel plate 4 is 4 to 6 mm (for example, 4 mm, 5 mm, 5.5 mm or 6 mm, etc.), the inner diameter of the drain pipe 5 is 32 to 38 mm (for example, 32 mm, 35 mm, 36 mm or 38 mm, etc.), and the length of the drain pipe 5 exposed on both sides of the plugging steel plate 4 is not less than 10 mm; Figure 4 and 5 shown.

[0044] Step S4, grouting liquid is set in the grouting machine 6, and the grouting pipe 3 is connected to the grouting machine 6. The grouting machine 6 performs low-pressure grouting (the low-pressure grouting pressure is generally between 0.5-1.0MPa) into the sponge structure 2 through the grouting pipe 3 to form a plugging zone in the sponge structure 2. Since the pressure in the pressurized water area is relatively high and the grouting pressure is relatively low, the grouting liquid will passively flow back into the leakage port 12 under the action of water pressure to gradually reduce the leakage port 12. In this process, water is discharged through the gap between the grouting pipe 3 and the drain pipe 5, as shown in FIG. Figure 6 Specifically, the grouting liquid is foamed polyurethane or epoxy resin.

[0045] Step S5, fully welding the sealing steel plate 4 to the surrounding side walls of the leakage opening 12, and using quick-hardening cement or leak-proofing agent to seal the surrounding areas of the sealing steel plate 4.

[0046] Step S6, increasing the grouting pressure (the increased grouting pressure is generally between 2.0-7.0MPa), so that the external sponge completely absorbs the liquid medicine, and the sponge structure 2 gradually forms a water-impermeable sponge liquid expansion body 2', and is squeezed and compacted with the surrounding soil to achieve the purpose of plugging and filling; then stop grouting and pull out the grouting pipe 3, such as Figure 7 shown.

[0047] Step S7, after the drain pipe 5 stops draining water (that is, the water pressure in the drain pipe 5 has basically disappeared), the drain pipe 5 is blocked. Figure 8 shown.

[0048] Specifically, the process for sealing the drain pipe 5 includes: using a hammer to drive a conical steel column 7 (the conical steel column can be made on-site using steel bars) into the drain pipe 5 to ensure that it is driven in tightly, and after spot welding the conical steel column 7 to the drain pipe 5, the conical steel column 7 is fully welded to the drain pipe 5 to complete the sealing of the drain pipe 5.

[0049] In summary, the present invention discloses a method for plugging leaks in a pressurized water area enclosure structure, which chisels out a leak in the leak area, then fills it with a sponge structure wrapped with a grouting pipe and spot welds a plugging steel plate with a drain pipe, then injects a small amount of grouting at low pressure to form a plugging belt outside the structure, and pushes the plugging belt into the leak relying on water pressure to gradually reduce the leak, and then fully welds the plugging steel plate and plugs its surroundings; finally, the grouting pressure is increased to allow the sponge structure to absorb all the liquid medicine, expand together to fill the loose soil in the dense area; then, a conical steel column is used to plug the diversion pipe to complete the final operation. This method not only solves the difficulty of soil loss outside the structure without reaction force, but also reduces water pressure to reduce liquid medicine loss, provides time for liquid medicine to expand, and achieves the purpose of plugging densely to avoid ground collapse and cracking.

[0050] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0051] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A method for plugging leakage in a pressurized water area enclosure structure, characterized in that: The steps include: Find out the leakage points of the enclosure structure and excavate the leakage areas to form leakage openings; Providing a sponge structure and at least four grouting pipes, and wrapping the liquid outlet ends of the at least four grouting pipes into the sponge structure, and filling the sponge structure wrapped with the grouting pipes from the leakage port to the soil facing surface of the enclosure structure; A plugging steel plate matching the size of the leakage port is provided, and at least four drainage pipes are provided through the plugging steel plate. The plugging steel plate is respectively sleeved on the grouting pipe through each of the pressure relief pipes, and the plugging steel plate is spot welded to the steel bars around the leakage port; Low-pressure grouting is performed into the sponge structure through the grouting pipe to form a plugging zone in the sponge structure, and the grouting liquid enters the leakage port under the action of water pressure and drains water through the gap between the grouting pipe and the drain pipe; Fully weld the sealing steel plate to the surrounding side walls of the leakage port, and seal the surrounding areas of the sealing steel plate; Increasing the grouting pressure, and after the sponge structure forms a water-impermeable sponge liquid expansion body and is squeezed and compacted with the surrounding soil, stopping the grouting and pulling out the grouting pipe; And after the drain pipe stops draining water, the drain pipe is blocked.

2. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The sponge structure is a sponge wrapped with hemp fibers.

3. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The grouting pipe is a plastic hose.

4. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The thickness of the blocking steel plate is 4 to 6 mm.

5. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The grouting liquid is foamed polyurethane or epoxy resin.

6. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The inner diameter of the grouting pipe is 7-9 mm, and the inner diameter of the drain pipe is 32-38 mm.

7. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The length of the drain pipe exposed on both sides of the blocking steel plate is not less than 100 mm.

8. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The process for plugging the drain pipe includes: A conical steel column is driven into the drain pipe, and after the conical steel column and the drain pipe are fixed by spot welding, the conical steel column and the drain pipe are fully welded to complete the plugging of the drain pipe.

9. The method for plugging leakage in a pressurized water area enclosure structure according to claim 1, characterized in that: The sealing steel plate is sealed around with a leak-proof sealant.

10. The method for plugging leakage of a pressurized water area enclosure structure according to claim 1, characterized in that: The enclosure structure is a continuous wall.

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