Grouting device

Abstract

The utility model belongs to the technical field of foundation pit construction, and discloses a grouting device which comprises a connecting piece and a grouting mechanism. The connecting piece is provided with a through connecting cavity in the extending direction of the connecting piece, and the two ends of the connecting cavity can communicate with the pressure reduction well upper pipe and the pressure reduction well lower pipe in a one-to-one correspondence mode. The multiple grouting mechanisms are arranged on the outer circumferential wall of the connecting piece in the circumferential direction of the connecting piece at intervals so that the grouting effect can be improved. And the grouting mechanism comprises a reserved pipe and a grouting assembly, and the extension direction of the reserved pipe is parallel to the through direction of the connecting cavity, so that it is guaranteed that the reserved pipe can be smoother in the hole descending process along with the connecting piece, and the operation safety is improved. One end of the reserved pipe is configured to inject grout, the other end of the reserved pipe is communicated with the grouting assembly, and the grout is sprayed through the grouting assembly, so that the grout can be more fully filled and solidified. Through the arrangement, the grouting device can improve the grouting effect and the operation safety.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit construction technology, and in particular to a grouting device. Background Technology

[0002] The measures required to ensure the safety and stability of underground spaces during the construction of underground structures, including retaining structures, groundwater control, and environmental protection, are collectively referred to as foundation pit engineering. For groundwater control, groundwater is generally classified into upper unconfined aquifers, impermeable layers, and confined aquifers. Because foundation pits for building, commercial, and municipal engineering projects are often excavated at considerable depths, the underlying confined aquifers are frequently at risk of sudden inrush. Therefore, during foundation pit excavation, the confined water head must be reduced layer by layer as needed according to the excavation depth to prevent sudden inrush.

[0003] Regarding the risk of confined water surge, engineering projects often use pressure relief wells to reduce pressure. When sealing the sidewalls of existing pressure relief wells, clay balls are generally used for backfilling within the confined water barrier, or water-stop rings are used to expand upon contact with water for water-stopping. However, the quality of the clay ball backfill and the expansion rate of the water-stop rings cannot be guaranteed. If grouting is performed in the barrier layer using a ground drilling rig, it is easy to cause confined water surge, and the grouting effect cannot be guaranteed. Utility Model Content

[0004] The purpose of this invention is to provide a grouting device that can improve grouting effect and operational safety.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A grouting device comprising:

[0007] The connector has a through-hole along its extension direction. The two ends of the connecting cavity can be connected to the upper pipe and the lower pipe of the decompression well in a one-to-one correspondence. The upper pipe, the connector, and the lower pipe of the decompression well are arranged coaxially and collinearly.

[0008] Multiple grouting mechanisms are spaced apart along the circumference of the connector on the outer peripheral wall of the connector. Each grouting mechanism includes a reserved pipe and a grouting assembly. One end of the reserved pipe is configured to inject grout, and the other end is connected to the grouting assembly. The grouting assembly is capable of spraying grout.

[0009] Optionally, the grouting assembly includes a grouting cylinder and a sliding member. The grouting cylinder has a grouting port. The interior of the grouting cylinder is connected to the reserved pipe and to the outside through the grouting port. The sliding member is slidably connected to the grouting cylinder. When the sliding member slides, the grouting port opens. When the sliding member stops, the grouting port closes.

[0010] Optionally, the grouting assembly further includes an elastic element connected to the sliding member, the grouting cylinder is provided with a sliding groove communicating with the reserved pipe, the sliding member is slidably connected to the sliding groove, and the elastic element is configured to drive the sliding member to stop in the sliding groove.

[0011] Optionally, the sliding groove is provided with a limiting plate, which divides the sliding groove into a receiving groove and a driving groove. The receiving groove is connected to the reserved pipe and has the grouting port. One end of the elastic member abuts against the bottom of the driving groove, and the other end is connected to the sliding member. The sliding member abuts against the inner wall of the receiving groove under the stretching of the elastic member.

[0012] Optionally, two limiting plates are provided, and the two limiting plates are spaced apart along the extension direction of the receiving groove, forming a sealing groove between the two limiting plates. The receiving groove, the sealing groove, and the driving groove are arranged sequentially.

[0013] Optionally, the sliding member is slidably connected to the limiting plate and is sealed to the limiting plate.

[0014] Optionally, the receiving groove is provided with a plurality of connecting holes, which are configured to communicate with the reserved pipe, and the plurality of connecting holes are spaced apart along the circumference of the grouting cylinder.

[0015] Optionally, the grouting assembly further includes a grouting box, the interior of which is provided with a transition cavity. One end of the reserved pipe is connected to the interior of the grouting cylinder through the transition cavity. The grouting box has an injection port. The interior of the transition cavity is connected to the outside through the injection port. The grouting cylinder is disposed in the transition cavity, and the grouting port is connected to the injection port.

[0016] The extension direction of the injection nozzle is set at an angle to the radial direction of the connector.

[0017] Optionally, the pressure relief well upper pipe is provided with a plurality of through-type grouting pipes, the plurality of grouting pipes being arranged at intervals along the circumference of the pressure relief well upper pipe, and the plurality of grouting pipes being configured to be connected one-to-one with a plurality of reserved pipes.

[0018] The beneficial effects of this utility model are:

[0019] This utility model provides a grouting device, which includes a connector and grouting mechanisms. Multiple grouting mechanisms are provided. The connector has a through-hole along its extension direction, and the two ends of the connecting cavity can be connected one-to-one to the upper and lower casings of a pressure relief well, thereby assembling a pressure relief well casing for drilling and lowering. The upper casing, connector, and lower casing are coaxially and collinearly arranged, ensuring the stability of the grouting operation and preventing excessive disturbance of the aquitard by the grout, thus reducing the risk of pressurized water surge. Multiple grouting mechanisms are spaced apart along the circumference of the connector on its outer peripheral wall to achieve uniform grouting, improve the grouting effect, and avoid local over- or under-grouting. The grouting mechanism includes a pre-reserved pipe and a grouting assembly. One end of the pre-reserved pipe is configured to inject grout, and the other end is connected to the grouting assembly. The grout is sprayed through the grouting assembly, allowing the grout to fill and solidify more fully. Through the above configuration, the grouting device of this application can improve the grouting effect and operational safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pressure relief well casing provided in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the grouting device provided in an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0023] Figure 4 yes Figure 2 Cross-sectional view at point BB;

[0024] Figure 5 This is a schematic diagram of the grouting box provided in an embodiment of this utility model;

[0025] Figure 6 This is a schematic diagram of the grouting port being closed according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the grouting port being opened according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the limiting plate provided in an embodiment of the present utility model.

[0028] In the picture:

[0029] 100. Pressure relief well top pipe; 101. Grouting pipe; 200. Pressure relief well bottom pipe; 1. Connector; 11. Connecting cavity; 2. Grouting mechanism; 21. Reserved pipe; 22. Grouting assembly; 221. Grouting cylinder; 2211. Grouting port; 2212. Sliding groove; 22121. Limiting plate; 22122. Receiving groove; 221221. Connecting hole; 22123. Drive groove; 22124. Sealing groove; 222. Sliding component; 223. Elastic component; 224. Grouting box; 2241. Transition cavity; 2242. Injection port. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] The measures required to ensure the safety and stability of underground spaces during the construction of underground structures, including retaining structures, groundwater control, and environmental protection, are collectively referred to as foundation pit engineering. For groundwater control, groundwater is generally classified into upper unconfined aquifers, impermeable layers, and confined aquifers. Because foundation pits for building, commercial, and municipal engineering projects are often excavated at considerable depths, the underlying confined aquifers are frequently at risk of sudden inrush. Therefore, during foundation pit excavation, the confined water head must be reduced layer by layer as needed according to the excavation depth to prevent sudden inrush.

[0035] Regarding the risk of confined water surge, engineering projects often use pressure relief wells to reduce pressure. Existing pressure relief wells typically use clay balls to backfill within the confined water barrier during sidewall sealing, or use water-stop rings that expand upon contact with water to stop the flow. However, the quality of the clay ball backfill and the expansion rate of the water-stop rings cannot be guaranteed. Furthermore, if grouting is performed through pilot holes in the barrier using a surface drilling rig, it can easily cause a confined water surge, and the grouting effect cannot be guaranteed.

[0036] like Figures 1-8 As shown, this embodiment provides a grouting device, which includes a connector 1 and a grouting mechanism 2. Multiple grouting mechanisms 2 are provided. The connector 1 has a through-hole 11 extending along its own extension direction. The two ends of the through-hole 11 can be connected to the upper pipe 100 and the lower pipe 200 of the pressure relief well, respectively. The upper pipe 100, the connector 1, and the lower pipe 200 are coaxially and collinearly arranged. Multiple grouting mechanisms 2 are spaced apart along the circumference of the connector 1 on its outer peripheral wall. Each grouting mechanism 2 includes a pre-reserved pipe 21 and a grouting assembly 22. One end of the pre-reserved pipe 21 is configured to inject grout, and the other end is connected to the grouting assembly 22, which can spray grout.

[0037] In this embodiment, multiple grouting mechanisms 2 are provided. The connector 1 has a through-hole 11 extending along its own extension direction. The two ends of the through-hole 11 can be connected one-to-one to the upper pipe 100 and the lower pipe 200 of the pressure relief well, thus assembling to form the pressure relief well casing for drilling and lowering. The upper pipe 100, connector 1, and lower pipe 200 are coaxially and collinearly arranged, ensuring the stability of the grouting operation and preventing excessive disturbance of the aquitard by the grout, thereby reducing the risk of pressurized water surge. Multiple grouting mechanisms 2 are spaced apart circumferentially on the outer peripheral wall of the connector 1 to achieve uniform grouting, improve the grouting effect, and avoid excessive or insufficient grouting in certain areas. The grouting mechanism 2 includes a pre-reserved pipe 21 and a grouting assembly 22. One end of the pre-reserved pipe 21 is configured to inject grout, and the other end is connected to the grouting assembly 22. The grout is sprayed through the grouting assembly 22, allowing the grout to fill and solidify more fully. With the above-mentioned design, the grouting device of this application can improve the grouting effect and operational safety.

[0038] The specific structure of the grouting device is described below:

[0039] Specifically, in this embodiment, the connector 1 is a sleeve with a circular cross-section. The sleeve has a through-hole connecting cavity 11. Both ends of the sleeve are used to connect the upper pressure relief well casing 100 and the lower pressure relief well casing 200, ensuring that both ends of the connecting cavity 11 are respectively connected to the interiors of the upper pressure relief well casing 100 and the lower pressure relief well casing 200, thereby assembling a pressure relief well casing for drilling and lowering. In other embodiments, the connector 1 is a cylindrical body with an elliptical or octagonal cross-section. Those skilled in the art can adjust the shape of the connector 1 based on the specific working conditions of the pressure relief well. The specific shape of the connector 1 is not limited here, as long as it achieves the aforementioned functions.

[0040] It should be noted that the axes of the upper casing 100, the sleeve, and the lower casing 200 of the pressure relief well are all on the same straight line to ensure that the sleeve and the upper casing 100 and the lower casing 200 of the pressure relief well can be smoothly connected and installed.

[0041] Specifically, the extension direction of the reserved tube 21 is parallel to the through direction of the connecting cavity 11, so as to ensure that the reserved tube 21 can move more smoothly with the connecting piece 1 in the lower hole and improve the safety of the operation.

[0042] Specifically, such as Figures 2-7 As shown, the grouting assembly 22 includes a grouting cylinder 221 and a sliding member 222. The grouting cylinder 221 has a grouting port 2211. The interior of the grouting cylinder 221 is connected to the reserved pipe 21 and to the outside through the grouting port 2211, so that the grout in the reserved pipe 21 can be discharged to the outside through the grouting port 2211, thereby realizing the grouting operation. The sliding member 222 is slidably connected to the grouting cylinder 221. When the sliding member 222 slides, the grouting port 2211 opens; when the sliding member 222 stops, the grouting port 2211 closes. By sliding and stopping the sliding member 222, the opening and closing of the grouting port 2211 can be precisely controlled, thereby achieving precise control of the grouting process, avoiding grout waste, and improving grouting efficiency.

[0043] More specifically, in this embodiment, the sliding member 222 includes a rubber plug, a screw, and a nut. The screw is connected to the rubber plug via the nut and is slidably connected to the grouting cylinder 221 to move the rubber plug, thereby opening or closing the grouting port 2211. Specifically, when the screw moves relative to the grouting cylinder 221, the rubber plug moves to open the grouting port 2211 to perform the grouting operation; and when the screw stops at the grouting cylinder 221, the rubber plug blocks the grouting port 2211, thereby stopping the grouting operation. In other embodiments, the sliding member 222 includes a slider, which is slidably connected to the grouting cylinder 221 to open or close the grouting port 2211.

[0044] It is understood that the sliding method of the drive slider 222 relative to the grouting cylinder 221 includes, but is not limited to, cylinder drive, electric push rod drive and motor drive, etc., and no further restrictions will be placed on the above driving methods here.

[0045] Specifically, in this embodiment, the grouting assembly 22 further includes an elastic element 223 connected to the sliding element 222. The grouting cylinder 221 is provided with a sliding groove 2212 communicating with the reserved pipe 21. The sliding element 222 is slidably connected to the sliding groove 2212. The elastic element 223 is configured to drive the sliding element 222 to stop in the sliding groove 2212. When an external force (such as grouting pressure or driving force) causes the sliding element 222 to slide and open the grouting port 2211, the sliding element 222 will reset under the action of the elastic potential energy of the elastic element 223, thereby closing the grouting port 2211, which helps to ensure the safety and controllability of the grouting process.

[0046] In this embodiment, the elastic element 223 is a spring, which is disposed in the sliding groove 2212. The sliding element 222 stops in the sliding groove 2212 under the elastic force of the spring, thereby realizing the automatic closing of the grouting port 2211. In other embodiments, the elastic element 223 is an elastic rubber pad or other structure. The specific structure of the elastic element 223 is not limited here, as long as it can achieve the above-mentioned functions.

[0047] Specifically, a limiting plate 22121 is provided in the sliding groove 2212, which divides the sliding groove 2212 into a receiving groove 22122 and a driving groove 22123. By setting the limiting plate 22121, the sliding member 222 can only slide in the receiving groove 22122, thereby restricting the sliding process of the sliding member 222 and improving the safety of the operation. The receiving groove 22122 is connected to the reserved pipe 21 and has a grouting port 2211. One end of the elastic member 223 abuts against the bottom of the driving groove 22123, and the other end is connected to the sliding member 222. The sliding member 222 abuts against the inner wall of the receiving groove 22122 under the tension of the elastic member 223. When the sliding member 222 abuts against the inner wall of the receiving groove 22122, the grouting port 2211 is closed. The elastic element 223 provides a stable driving force to ensure that the sliding element 222 is always kept in the closed position, so as to ensure the closure of the grouting port 2211 and prevent grout leakage.

[0048] More specifically, there are two limiting plates 22121, which are spaced apart along the extension direction of the receiving groove 22122. A sealing groove 22124 is formed between the two limiting plates 22121. The receiving groove 22122, the sealing groove 22124 and the driving groove 22123 are arranged in sequence. Since the sliding member 222 can slide relative to the grouting cylinder 221, the grout in the receiving groove 22122 will be carried to the driving groove 22123 during the sliding process of the sliding member 222, which will affect the normal operation of the elastic member 223. By setting the sealing groove 22124, an additional sealing barrier can be provided for the grouting operation, thereby reducing the risk of grout leakage.

[0049] More specifically, such as Figures 1-8 As shown, the sliding member 222 is slidably connected to the limiting plate 22121 and has a sealed fit with the limiting plate 22121, which can reduce the risk of grout leakage and thus improve the safety of the operation. The limiting plate 22121 has an opening for sliding engagement with the sliding member 222, and a sealing rubber ring is provided at the opening. When the sliding member 222 slides relative to the limiting plate 22121, the sealing rubber ring is clamped between the limiting plate 22121 and the sliding member 222, thereby preventing grout leakage through the gap between the sliding member 222 and the opening, which helps to improve the safety of the grouting operation. Alternatively, a silicone ring can be used to achieve the sealing fit between the sliding member 222 and the limiting plate 22121; this is not a limitation here.

[0050] Specifically, the receiving tank 22122 has multiple connecting holes 221221, which are configured to connect to the reserved pipe 21, so that the grout in the reserved pipe 21 can enter the receiving tank 22122 through the connecting holes 221221 and then be discharged to the outside through the grouting port 2211. The multiple connecting holes 221221 are arranged at intervals along the circumference of the grouting cylinder 221, which helps to increase the speed at which the grout in the reserved pipe 21 enters the receiving tank 22122, thereby improving the grouting efficiency.

[0051] Specifically, the grouting assembly 22 also includes a grouting box 224, which has a transition cavity 2241 inside to facilitate temporary storage of grout. One end of the reserved pipe 21 is connected to the inside of the grouting cylinder 221 through the transition cavity 2241. The grouting box 224 has a spray port 2242. The inside of the transition cavity 2241 is connected to the outside through the spray port 2242. The grouting cylinder 221 is disposed in the transition cavity 2241, and the grouting port 2211 is connected to the spray port 2242, so that the grout in the reserved pipe 21 can first enter the transition cavity 2241 for storage. Since the receiving groove 22122 has a connecting hole 221221, and the connecting hole 221221 is connected to the transition cavity 2241. When the grout pressure at the connecting hole 221221 is greater than the water pressure at the injection port 2211, the grout can enter the receiving groove 22122 through the connecting hole 221221, so that the grout can be sprayed out by the elastic potential energy accumulated by the elastic element 223.

[0052] Specifically, the extension direction of the injection port 2242 is set at an angle to the radial direction of the connector 1. Since the gap between the pressure relief well pipe and the surrounding soil is small, the above arrangement makes it easier for the slurry to be ejected from the injection port 2242, which is beneficial to improving the uniformity of slurry distribution.

[0053] More specifically, in this embodiment, the extension direction of the injection nozzle 2242 is perpendicular to the radial direction of the connector 1, so that the grout can be injected into the surrounding soil along the tangential direction of the connector 1, so as to facilitate the filling and solidification of the grout, which is beneficial to improving the stability and consistency of construction quality.

[0054] Specifically, the pressure relief well upper pipe 100 is provided with multiple through-type grouting pipes 101, which are spaced apart circumferentially along the upper pipe 100 to facilitate corresponding installation with multiple reserved pipes 21. The multiple grouting pipes 101 are configured to connect one-to-one with the multiple reserved pipes 21, allowing each grouting pipe 101 to perform grouting operations independently, improving the flexibility and controllability of grouting. The output end of the grouting machine is connected to the grouting pipe 101, enabling automated grouting operations, which improves work efficiency and ensures grouting effectiveness. Furthermore, those skilled in the art are familiar with the specific structure and working principle of the grouting machine, and will not elaborate further here.

[0055] It should be noted that the grouting device of this embodiment has the following advantages:

[0056] First, by setting up the grouting component 22, the pressure difference between the grout pressure and the water pressure is used to realize the closing and opening of the grouting port 2211, thereby facilitating the operation of grouting and improving the efficiency of the operation.

[0057] Second, since the drive groove 22123 and the receiving groove 22122 are completely sealed and isolated, the influence of the grout on the elastic element 223 is avoided, ensuring the durability of the grouting assembly 22, so as to realize the repeated use of the grouting assembly 22.

[0058] Third, the grouting component 22 in this embodiment can effectively prevent the backflow of water and grout.

[0059] IV. Operators can install one or more grouting boxes 224 and matching pipelines on the connector 1, which can quickly realize the combination and switching of various grouts.

[0060] Fifth, the grouting device in this embodiment acts on the bottom of the impermeable layer of the confined water, and achieves uniform grouting and water stoppage across the entire cross section of the impermeable layer through the difference in soil and water pressure in the stratum, thus effectively sealing the confined water.

[0061] VI. The grouting device in this embodiment is small in size, thus having a smaller impact on the backfilling of the filter material.

[0062] VII. The grouting device in this embodiment has a simple structure and reliable performance, and can be quickly connected to the upper pipe 100 and the lower pipe 200 of the decompression well, which is convenient for operation.

[0063] 8. The grouting pipe 101 located above the foundation pit bottom slab can be recycled and reused, thereby saving resources.

[0064] 9. The grouting device in this embodiment can both reinforce the quality of the clay ball backfill around the wall of the pressure relief well and realize emergency grouting operations in the event of a sudden surge of pressurized water.

[0065] like Figures 1-8 As shown, this embodiment also provides a grouting method, which, using the grouting device of this embodiment, can improve the grouting effect and operational safety of the pressure relief well. The grouting method includes the following steps:

[0066] Step 1: Connect the two ends of connector 1 to the upper pipe 100 and the lower pipe 200 of the pressure relief well to form a pressure relief well pipe. Connect the reserved pipe 21 and the grouting pipe 101 to each other, and cover the outer peripheral wall of the lower pipe 200 with a filter screen.

[0067] Step 2: Drill holes and lower the decompression well casing.

[0068] Step 3: Backfill filter material around the well casing of the pressure relief well up to the bottom of the waterproof layer, and then backfill clay balls in layers up to the ground.

[0069] In step three above, the filter media includes gravel, crushed stone, and ceramsite, etc., without further limitation. Furthermore, the function of the clay balls is to enhance the waterproofing performance of the impermeable layer and prevent the grout from polluting groundwater resources during the grouting process. During the backfilling process with clay balls, attention should be paid to their uniformity and compactness to ensure their waterproofing effect.

[0070] Step 4: Clean the well casing of the relief well and test pump water. Stop pumping water after the well casing of the relief well passes inspection.

[0071] In step four above, after the well is washed, a test pumping operation should be carried out. During the test pumping, the pumping speed, pumping volume and water quality should be observed and recorded to ensure that the pressure relief well casing meets the above qualified indicators before pumping is stopped.

[0072] Step 5: Grouting is performed through grouting pipe 101, causing grouting component 22 to spray grout around the well casing of the decompression well.

[0073] In step five above, when the foundation pit is excavated to a certain depth and pressurized water suddenly surges, it can be repeatedly grouted and sealed through grouting pipe 101.

[0074] Step 6: After the grouting operation is completed, clean the grouting device.

[0075] Following step six above, the following steps are also included: After the foundation pit is excavated, the grouting pipe 101 can be cut off and sealed during the well sealing stage of the pressure relief well pipe.

[0076] It should be noted that the grouting method in this embodiment is as follows: First, the two ends of the connector 1 are connected to the upper pipe 100 and the lower pipe 200 of the pressure relief well to form a pressure relief well pipe, ensuring the connection stability between the connector 1 and the upper pipe 100 and the lower pipe 200. Then, the reserved pipe 21 and the grouting pipe 101 are connected to each other to ensure the safe and smooth grouting operation, and a filter screen is wrapped on the outer peripheral wall of the lower pipe 200 to prevent clogging. Then, the hole is opened and the pressure relief well pipe is lowered, thereby ensuring the stability of the pressure relief well pipe and reducing the safety risks during construction. Afterwards, filter material is backfilled around the pressure relief well pipe to the bottom of the water-resistant layer, forming an effective filter layer to prevent the grout from contaminating the water-resistant layer during the grouting process. Then, clay balls are backfilled in layers to the ground surface, thereby enhancing the water-resistant performance of the water-resistant layer and improving the effect of the grouting operation. Finally, the pressure relief well pipe is flushed and pumped to ensure that the pressure relief well pipe is unobstructed. After the well casing of the pressure relief well passes inspection, pumping is suspended. Then, grouting is performed through the grouting pipe 101, causing the grouting assembly 22 to spray grout around the well casing. This ensures the grout is evenly and fully filled into the soil voids around the well casing, preventing backflow. Finally, after the grouting operation is completed, the grouting device is cleaned for cleaning and maintenance. Through the above setup, the grouting method of this embodiment can improve the grouting effect and operational safety of the pressure relief well.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A grouting device, characterized in that, include: The connector (1) has a through-connecting cavity (11) along its extension direction. The two ends of the connecting cavity (11) can be connected to the upper pipe (100) and the lower pipe (200) of the decompression well in a one-to-one correspondence. The upper pipe (100), the connector (1), and the lower pipe (200) of the decompression well are coaxially and collinearly arranged. Multiple grouting mechanisms (2) are arranged at intervals along the circumference of the connector (1) on the outer peripheral wall of the connector (1). Each grouting mechanism (2) includes a reserved pipe (21) and a grouting assembly (22). One end of the reserved pipe (21) is configured to inject grout, and the other end is connected to the grouting assembly (22). The grouting assembly (22) is capable of spraying grout.

2. The grouting device according to claim 1, characterized in that, The grouting assembly (22) includes a grouting cylinder (221) and a sliding member (222). The grouting cylinder (221) has a grouting port (2211). The interior of the grouting cylinder (221) is connected to the reserved pipe (21) and is connected to the outside through the grouting port (2211). The sliding member (222) is slidably connected to the grouting cylinder (221). When the sliding member (222) slides, the grouting port (2211) opens. When the sliding member (222) stops, the grouting port (2211) closes.

3. The grouting device according to claim 2, characterized in that, The grouting assembly (22) further includes an elastic element (223) connected to the sliding element (222). The grouting cylinder (221) is provided with a sliding groove (2212) communicating with the reserved pipe (21). The sliding element (222) is slidably connected to the sliding groove (2212). The elastic element (223) is configured to drive the sliding element (222) to stop in the sliding groove (2212).

4. The grouting device according to claim 3, characterized in that, The sliding groove (2212) is provided with a limiting plate (22121), which divides the sliding groove (2212) into a receiving groove (22122) and a driving groove (22123). The receiving groove (22122) is connected to the reserved pipe (21) and has the grouting port (2211). One end of the elastic member (223) abuts against the bottom of the driving groove (22123), and the other end is connected to the sliding member (222). The sliding member (222) abuts against the inner wall of the receiving groove (22122) under the stretching of the elastic member (223).

5. The grouting device according to claim 4, characterized in that, Two limiting plates (22121) are provided, and the two limiting plates (22121) are spaced apart along the extension direction of the receiving groove (22122). A sealing groove (22124) is formed between the two limiting plates (22121). The receiving groove (22122), the sealing groove (22124) and the driving groove (22123) are arranged in sequence.

6. The grouting device according to claim 4, characterized in that, The sliding member (222) is slidably connected to the limiting plate (22121) and is sealed to the limiting plate (22121).

7. The grouting device according to claim 4, characterized in that, The receiving groove (22122) is provided with a plurality of connecting holes (221221), which are configured to communicate with the reserved pipe (21), and the plurality of connecting holes (221221) are arranged at intervals along the circumference of the grouting cylinder (221).

8. The grouting device according to claim 2, characterized in that, The grouting assembly (22) further includes a grouting box (224), the grouting box (224) has a transition cavity (2241) inside, one end of the reserved pipe (21) is connected to the inside of the grouting cylinder (221) through the transition cavity (2241), the grouting box (224) has a jetting port (2242), the inside of the transition cavity (2241) is connected to the outside through the jetting port (2242), the grouting cylinder (221) is disposed in the transition cavity (2241), and the grouting port (2211) is connected to the jetting port (2242).

9. The grouting device according to claim 8, characterized in that, The extension direction of the injection port (2242) is set at an angle to the radial direction of the connector (1).

10. The grouting device according to any one of claims 1-9, characterized in that, The pressure relief well upper pipe (100) is provided with a plurality of through-connected grouting pipes (101), the plurality of grouting pipes (101) are arranged at intervals along the circumference of the pressure relief well upper pipe (100), and the plurality of grouting pipes (101) are configured to be connected to the plurality of reserved pipes (21) in a one-to-one correspondence.

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