Grouting pipe for waterproofing and leaking stoppage of underground building structure

Abstract

The utility model discloses a grouting pipe for waterproofing and leaking stoppage of an underground building structure, and relates to the technical field of building waterproofing. According to the technical key points, the device comprises a main pipe body, one end of the main pipe body is provided with a slurry outlet port, the other end of the main pipe body is connected with a leaking stoppage slurry introduction pipe, and the leaking stoppage slurry introduction pipe is provided with a control valve; the outer side of one section of pipe body of the main pipe body is coaxially sleeved with a rubber leather sheath, and the rubber leather sheath and the outer side wall, at the corresponding position, of the main pipe body jointly define a closed cavity. An air guide pipe is arranged at one end, close to the leaking stoppage slurry inlet pipe, of a cavity defined by the main pipe body and the rubber sheath. According to the grouting pipe, water leakage holes of an underground enclosure structure can be quickly and temporarily plugged by inflating the inner side of the rubber leather sheath, the grouting pipe is simple and convenient to use, in addition, even if the rubber leather sheath is accidentally damaged, only air leaks, and the influence on plugging slurry is small.

Description

Technical Field

[0001] This application relates to the field of building waterproofing technology, and in particular to a grouting pipe for waterproofing and leak sealing of underground building structures. Background Technology

[0002] During use, underground building structures may experience minor leaks due to issues such as insufficient water resistance of the waterproof membrane, inadequate concrete compaction, insufficient curing, or defects in the initial waterproofing design. For example, leaks may only appear as damp stains or minor seepage on the surface of the retaining wall. Workers can locate and clean the leak points, fill and compact them with a quick-setting sealant, and then apply a waterproof coating or polyurethane waterproofing layer. For larger cracks, workers need to drill diagonally along the crack (diagonal drilling is more difficult, but ensures the hole intersects the crack; vertical drilling makes it difficult to ensure the bottom of the grouting hole intersects the crack's opening because the concrete section containing the crack is not necessarily perpendicular to the concrete surface). Then, grouting pipes are installed along the drilled holes, and polyurethane or epoxy resin grouting material is injected under high pressure. After the grouting grout cures, the holes are sealed, and a waterproof coating is applied to enhance the seal. Another common type of water leakage hazard is water leakage through holes that frequently occur in underground retaining structures. This type of leakage problem may be caused by issues such as unclean joints, substandard mud, or slag inclusions in concrete during the construction of retaining structures such as diaphragm walls. As a result, holes are formed at the joints between diaphragm walls or between concrete mixing piles. Groundwater in the soil layer behind the retaining structure flows out through these holes, causing seepage hazards.

[0003] For common hole leakage problems, a common method is to embed a grouting pipe inside the hole, then seal the gaps in the hole with quick-setting cement. After the cement reaches the required strength, cement grout or other sealing materials are injected into the grouting pipe. Although this method uses quick-setting cement to seal the gaps in the hole wall, it still requires a relatively long time. A solution to this problem is proposed in Chinese patent application number 202122675050.8. The solution involves adding a liquid capsule to the outside of the grouting pipe. During use, the grouting pipe with the liquid capsule is inserted into the leaking hole in the outer retaining structure of the stratum, with the end of the grouting pipe furthest from the sliding ring inserted into the stratum. The sliding ring is located outside the hole. The sliding ring is then moved into the hole until the liquid capsule is compressed and deformed, adhering tightly to the inner wall of the hole. A tightening mechanism then fixes the sliding ring to the grouting pipe. Next, grout is injected into the stratum through the outer end of the grouting pipe. The grout is either cement grout or a cement-water glass dual-liquid grout. After the grout reaches its designed strength and completely seals the inner end of the hole, the tightening mechanism releases the sliding ring, and the sliding ring is moved out of the hole, allowing the grouting device to be removed. Finally, the hole is filled and sealed with cement mortar or other materials.

[0004] In use, the shape change of the amorphous liquid inside the grouting tube is mainly achieved by the worker adjusting the sliding ring along the tube. Furthermore, the liquid inside the grouting tube increases the weight of the entire device when the tube is inserted, obviously increasing the labor intensity for the workers. In addition, the tube body has tightening mechanisms to limit the sliding ring, further increasing the complexity of the overall device structure. Moreover, if the liquid capsule leaks during use, the liquid inside will inevitably affect the sealing grout in the holes. Utility Model Content

[0005] This application provides a grouting pipe for waterproofing and leak sealing of underground building structures. It can not only quickly perform leak sealing operations during grouting, but also has a simple structure that makes it difficult to affect the sealing grout in the hole even if there is a leak.

[0006] The above-mentioned objective of this application is achieved through the following technical solution:

[0007] A grouting pipe for waterproofing and plugging underground building structures includes a main body, one end of which is equipped with a grout outlet port, and the other end of which is connected to a grouting inlet pipe. The grouting inlet pipe is equipped with a control valve, which can control the flow rate of the grouting liquid flowing into the main body.

[0008] A cylindrical rubber sleeve is coaxially fitted on the outer side of one section of the main tube. Both ends of the rubber sleeve are fixedly connected to the outer wall of the main tube. The rubber sleeve and the corresponding outer wall of the main tube together form a closed cavity.

[0009] A vent pipe is provided at one end of the cavity formed by the main body and the rubber sheath near the end of the plugging slurry inlet pipe.

[0010] Furthermore, an annular groove is provided along the circumference of one section of the main tube, and the rubber sleeve is installed in the annular groove; the depth of the annular groove is such that when the rubber sleeve is attached to the main tube, the outer wall of the rubber sleeve is located in the annular groove.

[0011] Furthermore, the air guide tube is inserted into the side wall of one side of the main body near the end of the plugging slurry inlet pipe, and one port of the air guide tube is located on the outside of the main body, while the other port of the air guide tube is located inside the main body and is connected to the cavity formed by the rubber sleeve and the annular groove.

[0012] Furthermore, the rubber sheath is made of synthetic rubber, natural rubber, and a fiber reinforcement layer vulcanized together.

[0013] Furthermore, the slurry outlet includes a conical main slurry nozzle, and multiple auxiliary slurry pipes are evenly installed around the main slurry nozzle. A rubber check valve is provided inside the main slurry nozzle, and the rubber check valve is located inside the main slurry nozzle on the side near the control valve at the connection point between the auxiliary slurry pipes and the main slurry nozzle.

[0014] Furthermore, the auxiliary spray pipe is a flexible plastic pipe, and the large-diameter end of the main spray nozzle is inserted into the main pipe body and the two are slidably connected.

[0015] Furthermore, a limiting ring is fixedly installed inside the main body at the end away from the plugging grout inlet pipe, and there is a gap between the limiting ring and the port on the adjacent side of the main body. The inner diameter of the limiting ring is smaller than the inner diameter of the large diameter end of the main grouting nozzle. A hollow end cap is threadedly connected to the outer side of the port on the main body where the main grouting nozzle is installed. The inner diameter of the hollow end cap is between the outer diameter of the large diameter of the main grouting nozzle and the outer diameter of the main grouting nozzle at the location where the auxiliary grouting pipe is installed.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] This application features a rubber sleeve fixedly fitted on the outer side of one section of the main pipe. This rubber sleeve and the main pipe form a closed cavity. An air duct is installed at one end of this cavity. When a hole leaks in the underground retaining structure, on-site workers can insert the main pipe into the hole. When the grout outlet reaches the leak point behind the retaining structure, the workers connect the output end of a pre-prepared air pump to the air duct and start the air pump. The air pump will then blow air into the cavity formed by the rubber sleeve and the main pipe. As the air pressure increases, the rubber sleeve will rapidly expand in the leaking hole until it contacts the inner wall of the hole, thus sealing the hole. This achieves the effect of quickly sealing the leaking hole, allowing for rapid delivery of sealing grout into the main pipe and rapid treatment of the leak point behind the retaining structure, preventing it from developing further and worsening the leakage problem. Furthermore, the rubber sleeve of this application achieves its expansion and sealing effect by inflating it with air using an air pump. Even if the rubber sleeve is accidentally damaged during use, only ordinary air will leak out, which will obviously have less impact on the sealing slurry inside the hole than the impact of leakage from liquid capsules in the prior art. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this application;

[0020] Figure 2 This is a structural diagram showing a portion of the structure of this application cut open;

[0021] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0022] Figure 4 yes Figure 2 Enlarged structural diagram at point B;

[0023] Figure 5 This is a schematic diagram of the structure after the slurry outlet port and hollow end cap of this application have been disassembled from the main body;

[0024] Figure 6 Is Figure 5 A schematic diagram of the process of inserting the slurry outlet port into the main tube based on the above.

[0025] Figure 7 This is a schematic diagram of the state of the grouting pipe of this application when it is inserted from the retaining structure into the water leakage area of ​​the soil layer behind it;

[0026] Figure 8 Is Figure 7 Based on this, a schematic diagram of the state after the cavity formed by the annular groove on the rubber sleeve and the main body is inflated;

[0027] Figure 9 Is Figure 8 This is a schematic diagram illustrating the state of the soil around the leak point after the plugging grout is pumped into the main pipe and then pushes the main grout nozzle and auxiliary grout pipe out of the main pipe.

[0028] Explanation of reference numerals in the attached drawings: 1. Main pipe; 2. Grout outlet; 21. Main grout nozzle; 22. Auxiliary grout pipe; 23. Rubber check valve; 3. Leak-stopping grout inlet pipe; 4. Control valve; 5. Rubber sleeve; 6. Air guide pipe; 7. Annular groove; 8. Limiting ring; 9. Hollow end cap. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0030] like Figures 1-4 As shown, this application discloses a grouting pipe for waterproofing and plugging underground building structures, including a main body 1. One end of the main body 1 is equipped with a grout outlet port 2, and the other end of the main body 1 is connected to a plugging grout inlet pipe 3. The plugging grout inlet pipe 3 is equipped with a control valve 4, which can control the flow rate of the plugging grout flowing into the main body 1.

[0031] A cylindrical rubber sleeve 5 is coaxially sleeved on the outer side of one section of the main tube body 1. Both ends of the rubber sleeve 5 are fixedly connected to the outer side wall of the main tube body 1. The rubber sleeve 5 and the corresponding outer side wall of the main tube body 1 together form a closed cavity.

[0032] A vent pipe 6 is provided at one end of the cavity formed by the main body 1 and the rubber sleeve 5 near the end of the plugging slurry inlet pipe 3.

[0033] In the above embodiments, the main body 1 of this application is mainly used to transport the plugging grout to the designated leak point. Its function is similar to that of the main body of the grouting pipe in the prior art. One end of the main body 1 is provided with a grout outlet port 2, and the other end is connected to a plugging grout inlet pipe 3 with a control valve 4. In actual work, the plugging grout inlet pipe 3 can introduce the plugging grout prepared on site into the main body 1, and send it to the leak point of the leakage hole through the grout outlet port 2 of the main body 1. The control valve 4 on the plugging grout inlet pipe 3 is used to control the specific flow rate of the plugging grout in the main body 1 so that workers can make real-time adjustments according to the site conditions.

[0034] In this application, a cylindrical rubber sleeve 5 is coaxially fitted on the outer side of one section of the main pipe 1, which is inserted into the leak hole. Both ends of the rubber sleeve 5 are fixedly connected to the outer wall of the main pipe 1, while the middle section of the rubber sleeve 5 is not connected to the main pipe 1. Thus, the rubber sleeve 5 and the main pipe 1 together form a closed cavity outside the main pipe 1. A vent pipe 6 is provided near the end of the sealing slurry inlet pipe 3, and the internal spaces of both are connected. For example... Figure 7As shown, when a leaking hole appears in the underground retaining structure, the worker first inserts the grout outlet port 2 of the main pipe 1 into the hole, and then continues to move the entire main pipe 1 along the hole. Once the foremost grout outlet port 2 reaches the leakage area on the back of the retaining structure, the worker checks whether the connection between the pre-prepared air pump and the air guide pipe 6 is secure. If the connection is secure enough, the air pump can be activated, and compressed air generated by the air pump is sent into the cavity formed by the rubber sleeve 5 and the main pipe 1 through the air guide pipe 6. As air is continuously introduced, as... Figure 8 As shown, the elastic rubber sleeve 5 gradually expands outside the main pipe body 1, and its radial diameter along the main pipe body 1 also gradually increases. After the rubber sleeve 5 is pressed against the inner wall of the hole, the air supply can be stopped. To ensure that the rubber sleeve 5 does not easily retract after the air supply is stopped, a valve core can be installed in the port connecting the air pipe 6 and the air pump. In this way, even if the air pump is turned off, the air inside the cavity formed by the rubber sleeve 5 and the main pipe body 1 will not leak out from the air pipe 6. This application uses air to inflate the cavity between the rubber sleeve 5 and the main pipe body 1, so that the rubber sleeve 5 is quickly expanded to temporarily seal the leaking hole on the outside of the main pipe body 1. Compared with the use of quick-hardening cement, it can reduce the waiting time required for workers to perform grouting work, thereby preventing the leakage point from expanding due to not being dealt with in time. Compared to existing technologies that use liquid capsules for sealing, requiring workers to push a sliding ring along the grouting pipe to change the shape of the liquid capsule for temporary sealing of leaking holes, this application uses a pneumatic filling method with compressed air pumped by an air pump. This is significantly less labor-intensive. Furthermore, during the sealing process, workers can refer to the real-time pressure parameters of the air pump to help judge the sealing effect of the rubber sleeve 5 after it is expanded and against the inner wall of the hole. This makes the confirmation of the actual sealing effect of the rubber sleeve 5 more intuitive than existing technologies. After the air pump is turned off, the rubber sleeve 5 of this application can automatically maintain an ideal pressure state, making operation significantly simpler and more convenient than existing technologies. In addition, the overall structure of the equipment in this application is simpler than that of existing technologies. Because the inner side of the rubber sleeve 5 of this application is filled with air, even if leakage occurs due to accidental damage during use, the impact on the sealing grout inside the hole is obviously smaller than the impact of leakage from liquid capsules in existing technologies.

[0035] Furthermore, such as Figure 2 and Figure 4 As shown, an annular groove 7 is provided along the circumference of one section of the main tube 1, and the rubber sleeve 5 is installed in the annular groove 7; the depth of the annular groove 7 is such that when the rubber sleeve 5 is attached to the main tube 1, the outer wall of the rubber sleeve 5 is located in the annular groove 7.

[0036] In the above embodiments, the rubber sleeve 5 of this application is installed in the annular groove 7 specially provided for it on the main pipe body 1. The length of the annular groove 7 along the axis of the main pipe body 1 is equal to the length of the rubber sleeve 5 along the axis of the main pipe body 1 when it is not in use. The groove depth of the annular groove 7 is sufficient to ensure that the rubber sleeve 5 is attached to the main pipe body 1 when it is not in use. The outer wall of the rubber sleeve 5 will not leak out of the annular groove 7. In this way, when the main pipe body 1 is inserted into the hole that is leaking water or grout, the risk of wear on the outer side of the rubber sleeve 5 during the movement of the main pipe body 1 and the inner wall of the hole can be reduced.

[0037] Furthermore, such as Figure 2 and Figure 4 As shown, the air guide pipe 6 is inserted into the side wall of one side of the main body 1 near the end of the plugging slurry inlet pipe 3, and one port of the air guide pipe 6 is located outside the main body 1, while the other port of the air guide pipe 6 is located inside the main body 1 and is connected to the cavity formed by the rubber sleeve 5 and the annular groove 7.

[0038] In the above embodiments, the air guide tube 6 of this application is inserted into the side wall of one side of the main body 1 near the end of the plugging slurry inlet tube 3. One end of the tube is located outside the main body 1, and the other end and the rubber sleeve 5 are connected to the cavity formed by the annular groove 7 on the main body 1. In this way, after the main body 1 is inserted into the hole where water or slurry is leaking, the end located outside the main body 1 can be easily connected to the air outlet port of the air pump on site, so that the air generated by the air pump can be transported from the outside of the main body 1 into the cavity formed by the rubber sleeve 5 and the annular groove 7 on the main body 1.

[0039] Furthermore, the rubber sheath 5 is made of synthetic rubber, natural rubber and fiber reinforcement layer vulcanized together.

[0040] In the above embodiments, the rubber airbag is a type of mold frequently used in construction, mainly for the casting and molding of pre-tensioned and post-tensioned concrete beams for highway bridges, and also used in culvert drainage projects. After being inflated with compressed air, the rubber airbag expands to meet its cross-sectional design requirements; the inflation pressure is determined by the manufacturer's specifications. It is easy to use, economical, durable, and reusable, and after inflation, it has sufficient strength to withstand the pressure of concrete. The rubber airbag is made by vulcanizing synthetic rubber, natural rubber, and a fiber cloth reinforcement layer. The rubber sleeve 5 of this application is used in a similar scenario to the rubber airbag; its outer side frequently needs to be inflated during use and, after expansion, comes into contact with the inner wall of the openings in the enclosure structure, bearing a certain amount of compressive force. Therefore, the rubber sleeve 5 of this application is made of the same material as traditional rubber airbags.

[0041] Furthermore, such as Figures 1-3As shown, the slurry outlet includes a conical main slurry nozzle 21. Multiple auxiliary slurry pipes 22 are evenly installed around the main slurry nozzle 21. A rubber check valve 23 is provided inside the main slurry nozzle 21, and the rubber check valve 23 is located inside the main slurry nozzle 21 near the control valve 4 at the connection point between the auxiliary slurry pipes 22 and the main slurry nozzle 21.

[0042] In the above embodiments, the main grouting nozzle 21 is designed in a conical shape. This increases the pressure and flow rate of the grout when spraying grout into the holes on the back of the retaining structure, allowing the grout to penetrate deeply into and reinforce the loose soil around the leak. Multiple auxiliary grouting pipes 22 are added around the main grouting nozzle 21. These auxiliary pipes 22 can discharge grout along with the main grouting nozzle 21, increasing the area that the grouting pipe can reinforce per unit time. The rubber check valve 23 installed in the main grouting nozzle 21 as described above effectively prevents the sprayed grout from flowing back into the main pipe 1.

[0043] Furthermore, such as Figure 6 As shown, the auxiliary spray pipe 22 is an elastic plastic pipe, and the large-diameter end of the main spray nozzle 21 is inserted into the main pipe body 1 and the two are slidably connected.

[0044] In the above embodiments, in order to increase the grout delivery distance of the auxiliary grouting pipe 22, the vertical distance between the grout outlet of the auxiliary grouting pipe 22 and the axis of the main grouting outlet 21 is set to be greater than the radius of the main body 1. However, when the main body 1 is inserted into the leaking hole, the tilting direction of the grout outlet of the auxiliary grouting pipe 22 is the same as the moving direction of the main body 1. After the auxiliary grouting pipe 22 contacts the inner wall of the hole, the resistance generated by the inner wall of the hole on the auxiliary grouting pipe 22 can easily cause the auxiliary grouting pipe 22 to bend in the opposite direction, which can easily damage the auxiliary grouting pipe 22 and may affect the subsequent grouting reinforcement effect. Therefore, the auxiliary spraying pipe 22 of this application is made of elastic plastic pipe, and the main spraying nozzle 21 and the main pipe body 1 are slidably connected. This allows the worker to retract the main spraying nozzle 21 into the main pipe body 1 before inserting the main pipe body 1 into the leaking hole. The flexible plastic auxiliary spraying pipe 22 will then temporarily retract into the main pipe body 1 along with the main spraying nozzle 21 due to its elastic deformation properties. Then, when the main pipe body 1 is inserted into the leaking hole, as... Figure 7As shown, in this state, the auxiliary spraying pipe 22, being retracted within the main pipe 1, effectively prevents its injection port from contacting the inner wall of the leaking hole. After the grouting reinforcement work is completed, when the worker pulls the main pipe 1 out of the leaking hole, the direction of movement of the main pipe 1 is opposite to the tilting direction of the auxiliary spraying pipe 22. Even if the inner wall of the hole comes into contact with the auxiliary spraying pipe 22, the resistance to the auxiliary spraying pipe 22 is along its tilting direction. This process greatly reduces the probability of the auxiliary spraying pipe 22 being damaged due to bending. Furthermore, since the grouting pipe is stopped and removed from the leaking hole at this time, even if a problem occurs with the grouting pipe, it can be promptly detected and addressed by the worker before the next use, without affecting the subsequent grouting reinforcement effect.

[0045] Furthermore, such as Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, a limiting ring 8 is fixedly installed inside the main body 1 at the end away from the plugging grout inlet pipe 3, and there is a gap between the limiting ring 8 and the port of the main body 1 on the adjacent side. The inner diameter of the limiting ring 8 is smaller than the inner diameter of the large diameter end of the main grouting port 21. A hollow end cap 9 is threadedly connected to the outer side of the port of the main grouting port 21 on the main body 1. The inner diameter of the hollow end cap 9 is between the outer diameter of the large diameter of the main grouting port 21 and the outer diameter of the main grouting port 21 at the position where the auxiliary grouting pipe 22 is installed.

[0046] In the above embodiments, the inner diameter of the limiting ring 8 fixed inside the main body 1 is smaller than the inner diameter of the large diameter end of the main grouting nozzle 21. The difference between the two can be controlled within 2mm. This not only ensures that when the worker inserts the main grouting nozzle 21 into the main body 1, the limiting ring 8 can limit the main grouting nozzle 21 to prevent it from being inserted too deeply, but also ensures that the middle area of ​​the limiting ring 8 can provide sufficient space for the sealing grout to flow smoothly to the main grouting nozzle 21. A hollow end cap 9 is threaded onto one end of the main body 1 where the main grouting nozzle 21 is inserted. The diameter (i.e., its inner diameter) of the hole in the middle of the hollow end cap 9 is smaller than the large diameter end of the main grouting nozzle 21. This ensures that when pressurized sealing grout is introduced into the main body 1, and the sealing grout pushes the main grouting nozzle 21 out of the main body 1, the edge of the hole in the middle of the hollow end cap 9 can prevent the main grouting nozzle 21 from detaching from the main body 1. The diameter of the hole in the middle of the hollow end cap 9 is larger than the outer diameter of the position where the auxiliary grouting pipe 22 is installed on the main grouting nozzle 21. This ensures that when the sealing grout in the main body 1 pushes the main grouting nozzle 21 out of the main body 1, the auxiliary grouting pipe 22 can smoothly reach the outside of the main body 1, so that the auxiliary grouting pipe 22 can reset and unfold under its own elastic force, and spray grout together with the port of the main grouting nozzle 21 to achieve the effect of reinforcing the soil layer around the leakage point of the retaining structure.

[0047] The implementation principle of this embodiment is as follows: Before use, the main pipe body 1, the rubber sleeve 5 on the main pipe body 1, and the grout outlet port 2 are inspected. After confirming that the quality is satisfactory, the on-site workers can quickly assemble the grouting pipe of this application. Figure 6 As shown, first unscrew the hollow end cap 9 on the main pipe body 1, then insert the main spray nozzle 21 and the auxiliary spray nozzle 22 into the main pipe body 1 together. Once you feel the large-diameter end of the main spray nozzle 21 abutting against the limiting retaining ring 8 inside the main pipe body 1, you can then screw the hollow end cap 9 back onto the main pipe body 1. Figure 7 As shown, the worker can then insert the main pipe 1 into the leaking hole in the underground retaining structure. After the end of the main pipe 1 is inserted into the leaking soil layer behind the retaining structure, the air pipe 6 located on the outside of the retaining structure can be connected to the pre-prepared air pump. Figure 8 As shown, start the air pump and inflate the cavity formed by the rubber sleeve 5 and the annular groove 7 on the main body 1 through the air guide pipe 6. As the gas is continuously injected, the rubber sleeve 5 will expand inside the hole. When the rubber sleeve 5 comes into contact with the inner wall of the hole and the pressure on the air pump reaches the expected value, the air pump can be turned off. At this time, the rubber sleeve 5 can achieve the effect of temporarily sealing the leaking hole.

[0048] Afterwards, workers can use a pump to introduce the pre-prepared sealing grout into the main body 1 through the sealing grout inlet pipe 3. The sealing grout can preferably be a flexible waterproof material, because flexible waterproof materials can penetrate into the interior of tiny cracks to form a continuous waterproof membrane, automatically filling dynamic cracks. Furthermore, flexible waterproof materials perform better than traditional quick-setting cement in humid environments. Figure 9 As shown, when the sealing grout flows along the main pipe 1 to the main spray nozzle 21, the flow rate and pressure of the already pressurized grout will increase instantaneously due to the conical shape of the main spray nozzle 21. This allows the grout to smoothly push the main spray nozzle 21 out of the main pipe 1. The auxiliary spray pipe 22 on the main spray nozzle 21, upon reaching the outside of the main pipe 1, will rapidly expand under its own elasticity. The sealing grout inside the main pipe 1 can then quickly cover the soil layer around the leak point through the main spray nozzle 21 and the auxiliary spray pipe 22, thus achieving a sealing and reinforcement effect. When the sealing grout strength reaches 80% of the design strength, the main pipe 1 is extracted from the leaking hole. At this point, the leak point on the back of the underground retaining structure is ready to be sealed by the sealing grout, and the inside of the hole is basically stable. Workers can then use conventional cement to seal the hole.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A grouting pipe for waterproofing and leak sealing of underground building structures, comprising a main body (1), characterized in that: One end of the main body (1) is equipped with a slurry outlet port (2), and the other end of the main body (1) is connected to a slurry inlet pipe (3). The slurry inlet pipe (3) is equipped with a control valve (4), and the flow rate of the slurry for plugging leaks into the main body (1) can be controlled by the control valve (4). A cylindrical rubber sleeve (5) is coaxially sleeved on the outer side of one section of the main body (1). Both ends of the rubber sleeve (5) are fixedly connected to the outer side wall of the main body (1). The rubber sleeve (5) and the corresponding outer side wall of the main body (1) together form a closed cavity. An air guide pipe (6) is provided at one end of the cavity formed by the main body (1) and the rubber sleeve (5) near the end of the plugging slurry inlet pipe (3).

2. The grouting pipe for waterproofing and leak sealing of underground building structures according to claim 1, characterized in that: A ring groove (7) is provided along the circumference of one section of the main tube (1), and the rubber sleeve (5) is installed in the ring groove (7); the depth of the ring groove (7) is such that when the rubber sleeve (5) is attached to the main tube (1), the outer wall of the rubber sleeve (5) is located in the ring groove (7).

3. The grouting pipe for waterproofing and leak sealing of underground building structures according to claim 2, characterized in that: The air guide tube (6) is inserted into the side wall of the main body (1) near the end of the plugging slurry inlet pipe (3), and one port of the air guide tube (6) is located outside the main body (1), and the other port of the air guide tube (6) is located inside the main body (1) and is connected to the cavity formed by the rubber sleeve (5) and the annular groove (7).

4. The grouting pipe for waterproofing and leak sealing of underground building structures according to any one of claims 1 to 3, characterized in that: The rubber sheath (5) is made of synthetic rubber, natural rubber and fiber reinforcement layer vulcanized together.

5. The grouting pipe for waterproofing and leak sealing of underground building structures according to claim 1, characterized in that: The slurry outlet includes a conical main slurry nozzle (21), and multiple auxiliary slurry pipes (22) are evenly installed around the main slurry nozzle (21). A rubber check valve (23) is provided inside the main slurry nozzle (21), and the rubber check valve (23) is located inside the main slurry nozzle (21) on the side near the control valve (4) at the connection point between the auxiliary slurry pipes (22) and the main slurry nozzle (21).

6. The grouting pipe for waterproofing and leak sealing of underground building structures according to claim 5, characterized in that: The auxiliary spray pipe (22) is an elastic plastic pipe, and the large-diameter end of the main spray nozzle (21) is inserted into the main pipe body (1) and the two are slidably connected.

7. The grouting pipe for waterproofing and leak sealing of underground building structures according to claim 6, characterized in that: A limiting ring (8) is fixed inside the main body (1) at the end away from the plugging grout inlet pipe (3), and there is a gap between the limiting ring (8) and the port of the main body (1) on the adjacent side. The inner diameter of the limiting ring (8) is smaller than the inner diameter of the large diameter end of the main grouting port (21). A hollow end cap (9) is threadedly connected to the outer side of the port of the main grouting port (21) installed on the main body (1). The inner diameter of the hollow end cap (9) is between the outer diameter of the large diameter of the main grouting port (21) and the outer diameter of the position where the auxiliary grouting pipe (22) is installed on the main grouting port (21).

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