Grouting device and grouting method

Abstract

The invention belongs to the technical field of foundation pit construction, and discloses a grouting device and a grouting method, and the grouting device 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. The grouting device is used in the grouting method. Through the arrangement, the grouting device can improve the grouting effect and the operation safety.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit construction, and in particular to a grouting device and a grouting method. Background Art

[0002] The retaining structures, groundwater control and environmental protection measures required to ensure the safety and stability of underground space during the construction of underground structures are collectively referred to as foundation pit engineering. For groundwater control, groundwater is generally divided into upper phreatic water, aquiclude and confined aquifer. Due to the deep excavation depth of foundation pits for construction, commercial and municipal engineering, the confined aquifer below is often at risk of sudden surge. Therefore, during the foundation pit excavation process, it is necessary to reduce the confined water head as needed according to the excavation depth to prevent sudden surges in the foundation pit.

[0003] As for the risk of pressurized water inrush, engineering projects often use pressure relief wells to reduce pressure. When sealing the side walls of existing pressure relief wells, clay balls are generally used to backfill the pressurized water impermeable layer, or water is stopped by using water stop rings that swell when exposed to water. However, the backfill quality of the clay balls and the expansion rate of the water stop rings cannot be guaranteed. If grouting is performed by drilling holes in the impermeable layer through a ground drilling rig, it is easy to cause pressurized water inrush, and the grouting effect cannot be guaranteed. Summary of the invention

[0004] The object of the present invention is to provide a grouting device which can improve the grouting effect and operation safety.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A grouting device, comprising:

[0007] The connector is provided with a connecting cavity which is through-set along its extension direction, and the two ends of the connecting cavity can be connected to the pressure relief well upper pipe and the pressure relief well down pipe in a one-to-one correspondence, and the pressure relief well upper pipe, the connector and the pressure relief well down pipe are coaxially arranged in a collinear manner;

[0008] A plurality of grouting mechanisms are arranged on the outer peripheral wall of the connecting member at intervals along the circumference of the connecting member, the grouting mechanism includes a reserved tube and a grouting assembly, the extension direction of the reserved tube is parallel to the through direction of the connecting cavity, one end of the reserved tube is configured to inject slurry, and the other end is connected to the grouting assembly, and the grouting assembly can spray slurry.

[0009] Optionally, the grouting assembly includes a grouting barrel and a sliding member, the grouting barrel is provided with a grouting port, the interior of the grouting barrel is connected to the reserved pipe, and is connected to the outside through the grouting port, the sliding member is slidably connected to the grouting barrel, when the sliding member slides, the grouting port is opened, and when the sliding member stops, the grouting port is closed.

[0010] Optionally, the grouting assembly further comprises an elastic member connected to the sliding member, a sliding groove connected to the reserved tube is provided in the grouting barrel, the sliding member is slidably connected to the sliding groove, and the elastic member is configured to drive the sliding member to stop in the sliding groove.

[0011] Optionally, a limit plate is provided in the sliding groove, and the limit plate divides the sliding groove into a receiving groove and a driving groove. The receiving groove is connected to the reserved pipe and is provided with 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 limit plates are provided, and the two limit plates are arranged at intervals along the extension direction of the accommodating groove, a sealing groove is formed between the two limit plates, and the accommodating groove, the sealing groove and the driving groove are arranged in sequence.

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

[0014] Optionally, the accommodating groove is provided with a plurality of connecting holes, and the connecting holes are configured to be connected to the reserved pipe, and the plurality of connecting holes are arranged at intervals along the circumference of the grouting cylinder.

[0015] Optionally, the grouting assembly also includes a grouting box, a transition cavity is provided inside the grouting box, one end of the reserved tube is connected to the interior of the grouting tube through the transition cavity, the grouting box is provided with an injection port, the interior of the transition cavity is connected to the outside through the injection port, the grouting tube is arranged in the transition cavity, and the grouting port is connected to the injection port.

[0016] Optionally, the pressure relief well upper pipe is provided with a plurality of grouting pipes which are arranged through the pressure relief well upper pipe, and the plurality of grouting pipes are arranged at intervals along the circumference of the pressure relief well upper pipe, and the plurality of grouting pipes are configured to be connected to the plurality of reserved pipes in a one-to-one correspondence.

[0017] Another object of the present invention is to provide a grouting method that can improve the grouting effect and operation safety of a relief well.

[0018] To achieve this object, the present invention adopts the following technical solutions:

[0019] A grouting method, using the grouting device as described above, the grouting method comprises:

[0020] Step 1: Connect the two ends of the connector to the pressure relief well upper pipe and the pressure relief well down pipe to form the pressure relief well pipe, connect the reserved pipe and the grouting pipe to each other, and cover the filter net on the outer peripheral wall of the pressure relief well down pipe;

[0021] Step 2: Drill a hole and lower the pressure relief well pipe;

[0022] Step 3: Backfill filter material around the pressure relief well pipe to the bottom of the water-blocking layer, and then backfill clay balls in layers to the ground;

[0023] Step 4: Wash the well pipe of the pressure relief well and try to pump water. After the pressure relief well pipe is inspected and qualified, suspend pumping water;

[0024] Step 5: Grouting is performed through the grouting pipe so that the grouting assembly sprays slurry around the well pipe of the pressure relief well;

[0025] Step 6: After the grouting operation is completed, clean the grouting device.

[0026] Beneficial effects of the present invention:

[0027] The present invention provides a grouting device, which includes a connector and a grouting mechanism. Among them, there are multiple grouting mechanisms. The connector is provided with a connecting cavity that is set through along its own extension direction, and the two ends of the connecting cavity can be connected to the pressure relief well upper pipe and the pressure relief well down pipe one by one, and then assembled to form the pressure relief well pipe for opening and lowering. The pressure relief well upper pipe, the connector and the pressure relief well down pipe are coaxially arranged in a collinear manner, which can ensure the stability of the grouting operation, and can avoid excessive disturbance of the slurry to the waterproof layer, thereby reducing the risk of pressurized water surge. Multiple grouting mechanisms are arranged on the outer peripheral wall of the connector at intervals along the circumference of the connector to achieve uniform grouting, improve the grouting effect, and avoid excessive or insufficient grouting in some parts. The grouting mechanism includes a reserved pipe and a grouting assembly. The extension direction of the reserved pipe is parallel to the through direction of the connecting cavity, so as to ensure that the reserved pipe can be smoother with the connector during the hole lowering process, thereby improving the safety of the operation. One end of the reserved pipe is configured to inject slurry, and the other end is connected to the grouting assembly, and the slurry is sprayed through the grouting assembly so that the slurry can be more fully filled and solidified. Through the above arrangement, the grouting device of the present application can improve the grouting effect and operation safety.

[0028] The present invention also provides a grouting method, firstly, the two ends of the connector are connected to the pressure relief well upper pipe and the pressure relief well lower pipe respectively to form the pressure relief well pipe, so as to ensure the connection stability between the connector and the pressure relief well upper pipe and the pressure relief well lower pipe. Then, the reserved pipe and the grouting pipe are connected to each other to ensure the safety and smoothness of the grouting operation, and the filter net is coated on the outer peripheral wall of the pressure relief well lower pipe to prevent clogging. Then, a hole is opened and the pressure relief well pipe is lowered, so as to ensure the stability of the pressure relief well pipe and reduce the safety risks during the construction process. Afterwards, the filter material is backfilled around the pressure relief well pipe to the bottom of the water-proof layer, and an effective filter layer is formed by the filter material to prevent the slurry from polluting the water-proof layer during the grouting process, and then the clay balls are backfilled to the ground in layers, thereby enhancing the water-proof performance of the water-proof layer and improving the effect of the grouting operation. Then, the pressure relief well pipe is washed and water is pumped to ensure that the pressure relief well pipe is unobstructed. After the pressure relief well pipe has passed the inspection, the pumping is suspended, and then grouting is performed through the grouting pipe, so that the grouting assembly sprays slurry around the pressure relief well pipe to ensure that the slurry is evenly and fully filled into the soil voids around the pressure relief well pipe, thereby improving the density and integrity of the grouting. Finally, after the grouting operation is completed, the grouting device is cleaned to achieve cleaning and maintenance of the grouting device. Through the above-mentioned settings, the grouting method of the present application can improve the grouting effect and operation safety of the pressure relief well. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of a pressure relief well pipe provided by an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a grouting device provided in an embodiment of the present invention;

[0031] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0032] Figure 4 yes Figure 2 Cross-section at the middle BB;

[0033] Figure 5 is a schematic diagram of a grouting box provided in an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of a grouting port closed according to an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of a grouting port opened according to an embodiment of the present invention;

[0036] Figure 8 Schematic diagram of a limiting plate provided in an embodiment of the present invention.

[0037] In the figure:

[0038] 100, pressure relief well pipe; 101, grouting pipe; 200, pressure relief well pipe; 1, connecting piece; 11, connecting cavity; 2, grouting mechanism; 21, reserved pipe; 22, grouting assembly; 221, grouting barrel; 2211, grouting port; 2212, sliding groove; 22121, limiting plate; 22122, accommodating groove; 221221, connecting hole; 22123, driving groove; 22124, sealing groove; 222, sliding piece; 223, elastic piece; 224, grouting box; 2241, transition cavity; 2242, injection port. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] The retaining structures, groundwater control and environmental protection measures required to ensure the safety and stability of underground space during the construction of underground structures are collectively referred to as foundation pit engineering. For groundwater control, groundwater is generally divided into upper phreatic water, aquiclude and confined aquifer. Due to the deep excavation depth of foundation pits for construction, commercial and municipal engineering, the confined aquifer below is often at risk of sudden surge. Therefore, during the foundation pit excavation process, it is necessary to reduce the confined water head as needed according to the excavation depth to prevent sudden surges in the foundation pit.

[0044] As for the risk of sudden surge of pressurized water, pressure is often reduced through pressure relief wells in engineering projects. When the existing pressure relief wells are plugged on the side walls, clay balls are generally used to backfill in the range of the pressurized water impermeable layer, or water stop rings are used to stop water when they swell when exposed to water. However, the backfill quality of clay balls and the expansion rate of water stop rings cannot be guaranteed. If grouting is carried out in the impermeable layer through a ground drilling rig, it is easy to cause sudden surge of pressurized water, and the grouting effect cannot be guaranteed.

[0045] like Figure 1-Figure 8 As shown, this embodiment provides a grouting device, which includes a connector 1 and a grouting mechanism 2. Among them, there are multiple grouting mechanisms 2. The connector 1 is provided with a connecting cavity 11 that is set through along its own extension direction, and the two ends of the connecting cavity 11 can be connected to the pressure relief well upper pipe 100 and the pressure relief well down pipe 200 in a one-to-one correspondence. The pressure relief well upper pipe 100, the connector 1 and the pressure relief well down pipe 200 are coaxially arranged in a colinear manner. Multiple grouting mechanisms 2 are arranged on the outer peripheral wall of the connector 1 at intervals along the circumference of the connector 1. The grouting mechanism 2 includes a reserved pipe 21 and a grouting assembly 22. The extension direction of the reserved pipe 21 is parallel to the through direction of the connecting cavity 11. One end of the reserved pipe 21 is configured to inject slurry, and the other end is connected to the grouting assembly 22. The grouting assembly 22 can spray slurry.

[0046] In this embodiment, a plurality of grouting mechanisms 2 are provided. The connector 1 is provided with a through-connecting cavity 11 along its own extension direction, and the two ends of the connecting cavity 11 can be connected to the pressure relief well upper pipe 100 and the pressure relief well lower pipe 200 in a one-to-one correspondence, and then assembled to form a pressure relief well pipe for opening and lowering. The pressure relief well upper pipe 100, the connector 1 and the pressure relief well lower pipe 200 are coaxially arranged in a collinear manner, which can ensure the stability of the grouting operation, and can avoid excessive disturbance of the slurry to the waterproof layer, thereby reducing the risk of pressurized water surge. Multiple grouting mechanisms 2 are arranged on the outer peripheral wall of the connector 1 at intervals along the circumference of the connector 1 to achieve uniform grouting, improve the grouting effect, and avoid excessive or insufficient local grouting. The grouting mechanism 2 includes a reserved pipe 21 and a grouting assembly 22. The extension direction of the reserved pipe 21 is parallel to the through direction of the connecting cavity 11 to ensure that the reserved pipe 21 can be smoother with the connector 1 during the hole lowering process, thereby improving the safety of the operation. One end of the reserved pipe 21 is configured to inject slurry, and the other end is connected to the grouting assembly 22, and the slurry is sprayed through the grouting assembly 22, so that the slurry can be more fully filled and solidified. Through the above arrangement, the grouting device of the present application can improve the grouting effect and operation safety.

[0047] The specific structure of the grouting device is described below:

[0048] Specifically, in this embodiment, the connector 1 is a sleeve with a circular cross section, and a connecting cavity 11 is provided in the sleeve. The two ends of the sleeve are used to connect the relief well pipe 100 and the relief well pipe 200, so as to ensure that the two ends of the connecting cavity 11 are respectively connected to the interior of the relief well pipe 100 and the relief well pipe 200, and then assembled to form a relief well pipe for opening and lowering. In other embodiments, the connector 1 is a cylinder 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 relief well. The specific shape of the connector 1 is not limited here, as long as the above-mentioned functions can be achieved.

[0049] It should be noted that the axes of the pressure relief well pipe 100, the sleeve and the pressure relief well pipe 200 are all on the same straight line to ensure that the sleeve and the pressure relief well pipe 100 and the pressure relief well pipe 200 can be smoothly connected and installed.

[0050] Specifically, Figure 2-Figure 7As shown, the grouting assembly 22 includes a grouting tube 221 and a sliding member 222. The grouting tube 221 is provided with a grouting port 2211. The interior of the grouting tube 221 is connected to the reserved tube 21, and is connected to the outside through the grouting port 2211, so that the slurry in the reserved tube 21 is discharged to the outside through the grouting port 2211, thereby realizing the grouting operation. The sliding member 222 is slidably connected to the grouting tube 221. When the sliding member 222 slides, the grouting port 2211 is opened, and when the sliding member 222 stops, the grouting port 2211 is closed. Through the sliding and stopping of the sliding member 222, the opening and closing of the grouting port 2211 can be accurately controlled, thereby realizing accurate control of the grouting process, thereby avoiding slurry waste and improving grouting efficiency.

[0051] 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 through the nut, and the screw is slidably connected to the grouting barrel 221, so as to drive the rubber plug to move, thereby realizing the opening or closing of the grouting port 2211. In detail, when the screw moves relative to the grouting barrel 221, the rubber plug moves to open the grouting port 2211 to realize the grouting operation; and when the screw stops at the grouting barrel 221, the rubber plug is blocked at 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 barrel 221, so as to realize the opening or closing of the grouting port 2211.

[0052] It is understandable that the driving method for the sliding member 222 to slide relative to the grouting cylinder 221 includes but is not limited to cylinder drive, electric push rod drive and motor drive, etc., and no excessive restrictions are made on the above driving methods.

[0053] Specifically, in this embodiment, the grouting assembly 22 also includes an elastic member 223 connected to the sliding member 222, a sliding groove 2212 connected to the reserved tube 21 is provided in the grouting tube 221, the sliding member 222 is slidably connected to the sliding groove 2212, and the elastic member 223 is configured to drive the sliding member 222 to stop in the sliding groove 2212. When an external force (such as grouting pressure or driving force) causes the sliding member 222 to slide and open the grouting port 2211, the sliding member 222 will reset under the action of the elastic potential energy of the elastic member 223, thereby closing the grouting port 2211, which helps to ensure the safety and controllability of the grouting process.

[0054] In this embodiment, the elastic member 223 is a spring, which is disposed in the sliding groove 2212. The sliding member 222 is stopped 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 member 223 is a structure such as an elastic rubber pad, and the specific structure of the elastic member 223 is not limited here, as long as the above-mentioned functions can be realized.

[0055] Specifically, a limit plate 22121 is provided in the sliding groove 2212, and the limit plate 22121 divides the sliding groove 2212 into a receiving groove 22122 and a driving groove 22123. By providing the limit plate 22121, the sliding member 222 can only slide in the receiving groove 22122, thereby limiting 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 a grouting port 2211 is opened. 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. When the sliding member 222 abuts against the inner wall of the receiving groove 22122, the grouting port 2211 is closed. The elastic member 223 provides a stable driving force to ensure that the sliding member 222 is always kept in the closed position, so as to ensure the closure of the grouting port 2211 and prevent the leakage of slurry.

[0056] More specifically, two limit plates 22121 are provided, and the two limit plates 22121 are arranged at intervals along the extension direction of the receiving groove 22122. A sealing groove 22124 is formed between the two limit 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 barrel 221, during the sliding process of the sliding member 222, the slurry in the receiving groove 22122 will be brought to the driving groove 22123 by the sliding member 222, thereby affecting 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 slurry leakage.

[0057] More specifically, Figure 1-Figure 8 As shown, the sliding member 222 is slidably connected to the limiting plate 22121 and is sealed with the limiting plate 22121, which can reduce the risk of slurry leakage, thereby improving the safety of the operation. Among them, the limiting plate 22121 is provided with an opening that is slidably matched 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 the slurry from leaking through the gap between the sliding member 222 and the opening, which is conducive to improving the safety of the grouting operation. In addition, a silicone ring can also be used to achieve a sealing match between the sliding member 222 and the limiting plate 22121, which is not limited too much here.

[0058] Specifically, the receiving groove 22122 is provided with a plurality of connecting holes 221221, and the connecting holes 221221 are configured to be connected to the reserved tube 21, so that the slurry in the reserved tube 21 enters the receiving groove 22122 through the connecting holes 221221, and is then discharged to the outside through the grouting port 2211. The plurality of connecting holes 221221 are arranged at intervals along the circumference of the grouting tube 221, which is conducive to increasing the speed at which the slurry in the reserved tube 21 enters the receiving groove 22122, thereby improving the grouting efficiency.

[0059] Specifically, the grouting assembly 22 also includes a grouting box 224, and a transition chamber 2241 is provided inside the grouting box 224 to facilitate temporary storage of slurry. One end of the reserved pipe 21 is connected to the inside of the grouting tube 221 through the transition chamber 2241, and the grouting box 224 is provided with a jet port 2242. The inside of the transition chamber 2241 is connected to the outside through the jet port 2242. The grouting tube 221 is arranged in the transition chamber 2241, and the grouting port 2211 is connected to the jet port 2242, so that the slurry in the reserved pipe 21 can first enter the transition chamber 2241 for storage. Since the accommodating groove 22122 is provided with a connecting hole 221221, and the connecting hole 221221 is connected to the transition chamber 2241. When the slurry pressure at the connecting hole 221221 is greater than the water pressure at the grouting port 2211 , the slurry can enter the receiving groove 22122 through the connecting hole 221221 , so that the slurry can be ejected and discharged through the elastic potential energy accumulated by the elastic member 223 .

[0060] More specifically, the extension direction of the injection port 2242 is perpendicular to the radial direction of the connector 1, so that the slurry can be injected toward the surrounding soil along the tangential direction of the connector 1, so as to facilitate the filling and solidification of the slurry, which is beneficial to improving the stability and consistency of the construction quality.

[0061] Specifically, the pressure relief well upper pipe 100 is provided with a plurality of grouting pipes 101 which are arranged through, and the plurality of grouting pipes 101 are arranged at intervals along the circumference of the pressure relief well upper pipe 100, so as to be installed correspondingly with the plurality of reserved pipes 21. The plurality of grouting pipes 101 are configured to be connected to the plurality of reserved pipes 21 in a one-to-one correspondence, so that each grouting pipe 101 can independently perform grouting operation, thereby improving the flexibility and controllability of grouting. Among them, the output end of the grouting machine is connected to the grouting pipe 101, and the automated operation of grouting is realized by the grouting machine, which is conducive to improving the operation efficiency and ensuring the grouting effect. Moreover, the specific structure and working principle of the grouting machine are clear to those skilled in the art, and will not be repeated here.

[0062] It should be noted that the grouting device of this embodiment has the following advantages:

[0063] First, by providing the grouting assembly 22, the pressure difference between the slurry pressure and the water pressure is utilized to realize the closing and opening of the grouting port 2211, thereby facilitating the operation of the grouting operation and improving the operation efficiency.

[0064] Second, since the driving groove 22123 and the containing groove 22122 are completely sealed and isolated, the influence of the slurry on the elastic member 223 is avoided, and the durability of the grouting assembly 22 is ensured, so that the grouting assembly 22 can be reused multiple times.

[0065] 3. The grouting assembly 22 of this embodiment can effectively prevent the backflow of water and slurry.

[0066] Fourth, the operator can install a single or multiple grouting boxes 224 and supporting pipelines on the connecting piece 1, which can quickly realize the combination and switching of various slurries.

[0067] 5. The grouting device of this embodiment acts on the bottom of the impermeable layer of pressurized water, and realizes uniform grouting and water-stopping of the entire cross-section of the impermeable layer through the water-soil pressure difference of the stratum, which can realize effective blocking of the pressurized water.

[0068] 6. The grouting device of this embodiment is small in size, so it has little impact on the backfilling of the filter material.

[0069] 7. The grouting device of this embodiment has a simple structure and reliable performance, and can be quickly connected to the pressure relief well upper pipe 100 and the pressure relief well lower pipe 200, so it is easy to operate.

[0070] 8. The grouting pipe 101 located above the foundation pit floor can be recycled and reused, thereby saving resources.

[0071] 9. The grouting device of this embodiment can not only be used to reinforce the quality of clay ball backfill around the wall of the pressure relief well, but also can realize the emergency grouting operation of pressurized water inrush.

[0072] like Figure 1-Figure 8 As shown, this embodiment also provides a grouting method, which uses the grouting device of this embodiment to improve the grouting effect and operation safety of the relief well. The grouting method includes the following steps:

[0073] Step 1: Connect the two ends of the connector 1 to the pressure relief well upper pipe 100 and the pressure relief well downhole pipe 200 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 pressure relief well downhole pipe 200 with a filter net.

[0074] Step 2: Drill a hole and lower the pressure relief well pipe.

[0075] Step 3: Backfill filter material around the pressure relief well pipe to the bottom of the waterproof layer, and then backfill clay balls in layers to the ground.

[0076] In the above step 3, the filter material includes gravel, crushed stone and ceramsite, etc., which are not limited here. Moreover, the role of the clay ball is to enhance the waterproof performance of the waterproof layer and prevent the slurry from polluting the groundwater resources during the grouting process. During the backfilling process of the clay ball, attention should be paid to the uniformity and density of the clay ball to ensure its waterproof effect.

[0077] Step 4: Wash the pressure relief well pipe and try to pump water. Stop pumping water after the pressure relief well pipe has passed the inspection.

[0078] In the above step 4, after the well washing is completed, a test pumping operation is carried out. During the test pumping process, the pumping speed, pumping volume and water quality and other indicators should be observed and recorded to ensure that the pressure relief well pipe meets the above qualified indicators before suspending pumping.

[0079] Step 5: Grouting is performed through the grouting pipe 101 so that the grouting assembly 22 sprays slurry around the well pipe of the pressure relief well.

[0080] In the above step 5, when the foundation pit is excavated to a certain depth and pressurized water suddenly surges, repeated grouting and plugging can be performed through the grouting pipe 101.

[0081] Step 6: After the grouting operation is completed, clean the grouting device.

[0082] After the above step six, the following step is also included: after the excavation of the foundation pit is completed, the grouting pipe 101 can be cut off and sealed during the sealing stage of the pressure relief well pipe.

[0083] It should be noted that the grouting method of this embodiment is as follows: first, the two ends of the connector 1 are connected to the pressure relief well upper pipe 100 and the pressure relief well down pipe 200 respectively to form a pressure relief well pipe, so as to ensure the connection stability between the connector 1 and the pressure relief well upper pipe 100 and the pressure relief well down pipe 200. Then the reserved pipe 21 and the grouting pipe 101 are connected to each other to ensure the safety and smoothness of the grouting operation, and the filter net is coated on the outer peripheral wall of the pressure relief well down pipe 200 to prevent clogging. Then the hole is opened and the pressure relief well pipe is lowered to ensure the stability of the pressure relief well pipe and reduce the safety risks during the construction process. After that, the filter material is backfilled around the pressure relief well pipe to the bottom of the water-proof layer, and an effective filter layer is formed by the filter material to prevent the slurry from polluting the water-proof layer during the grouting process, and then the clay balls are backfilled to the ground in layers, thereby enhancing the water-proof performance of the water-proof layer and improving the effect of the grouting operation. Then the pressure relief well pipe is washed and pumped to ensure that the pressure relief well pipe is unobstructed. After the pressure relief well pipe has passed the inspection, the pumping is suspended, and then grouting is performed through the grouting pipe 101, so that the grouting assembly 22 sprays slurry around the pressure relief well pipe to ensure that the slurry is evenly and fully filled into the soil voids around the pressure relief well pipe to prevent the slurry from flowing back. Finally, after the grouting operation is completed, the grouting device is cleaned to achieve cleaning and maintenance of the grouting device. Through the above settings, the grouting method of this embodiment can improve the grouting effect and operation safety of the pressure relief well.

[0084] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Grouting device, characterized in that, include: The connecting piece (1) is provided with a connecting cavity (11) extending along its own extension direction, and the two ends of the connecting cavity (11) can be connected to the pressure relief well upper pipe (100) and the pressure relief well down pipe (200) in a one-to-one correspondence, and the pressure relief well upper pipe (100), the connecting piece (1) and the pressure relief well down pipe (200) are coaxially arranged in a collinear manner; A plurality of grouting mechanisms (2) are arranged on the outer peripheral wall of the connecting member (1) at intervals along the circumference of the connecting member (1); the grouting mechanism (2) comprises a reserved tube (21) and a grouting assembly (22); the extension direction of the reserved tube (21) is parallel to the through direction of the connecting cavity (11); one end of the reserved tube (21) is configured to inject slurry, and the other end is connected to the grouting assembly (22); the grouting assembly (22) is capable of spraying slurry.

2. The grouting device according to claim 1, characterized in that: The grouting assembly (22) comprises a grouting cylinder (221) and a sliding member (222); the grouting cylinder (221) is provided with 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) is opened; when the sliding member (222) stops, the grouting port (2211) is closed.

3. The grouting device according to claim 2, characterized in that: The grouting assembly (22) further comprises an elastic member (223) connected to the sliding member (222); a sliding groove (2212) connected to the reserved tube (21) is provided in the grouting tube (221); the sliding member (222) is slidably connected to the sliding groove (2212); and the elastic member (223) is configured to drive the sliding member (222) to stop in the sliding groove (2212).

4. The grouting device according to claim 3, characterized in that: A limiting plate (22121) is provided in the sliding groove (2212), and the limiting plate (22121) divides the sliding groove (2212) into a containing groove (22122) and a driving groove (22123); the containing groove (22122) is connected to the reserved pipe (21) and is provided with 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 containing groove (22122) when the elastic member (223) is stretched.

5. The grouting device according to claim 4, characterized in that: Two limiting plates (22121) are provided, and the two limiting plates (22121) are arranged at intervals along the extension direction of the accommodating groove (22122), and a sealing groove (22124) is formed between the two limiting plates (22121), and the accommodating 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 with 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 connection holes (221221), and the connection holes (221221) are configured to be connected to the reserved pipe (21), and the plurality of connection holes (221221) are arranged at intervals along the circumference of the grouting tube (221).

8. The grouting device according to claim 2, characterized in that: The grouting assembly (22) further comprises a grouting box (224), a transition chamber (2241) being provided inside the grouting box (224), one end of the reserved tube (21) being connected to the interior of the grouting tube (221) via the transition chamber (2241), the grouting box (224) being provided with an injection port (2242), the interior of the transition chamber (2241) being connected to the outside via the injection port (2242), the grouting tube (221) being arranged in the transition chamber (2241), and the grouting port (2211) being connected to the injection port (2242).

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

10. Grouting method, characterized in that: Using the grouting device according to any one of claims 1 to 9, the grouting method comprises: Step 1: Connect the two ends of the connector (1) to the pressure relief well upper pipe (100) and the pressure relief well down pipe (200) respectively to form a pressure relief well pipe, connect the reserved pipe (21) and the grouting pipe (101) to each other, and coat the outer peripheral wall of the pressure relief well down pipe (200) with a filter screen; Step 2: Drill a hole and lower the pressure relief well pipe; Step 3: Backfill filter material around the pressure relief well pipe to the bottom of the water-blocking layer, and then backfill clay balls in layers to the ground; Step 4: Wash the well pipe of the pressure relief well and try to pump water. After the pressure relief well pipe is inspected and qualified, suspend pumping water; Step 5: Grouting is performed through the grouting pipe (101), so that the grouting assembly (22) sprays slurry around the well pipe of the pressure relief well; Step 6: After the grouting operation is completed, clean the grouting device.

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