A permeation gradient grouting system for the surrounding rock of a concrete shaft wall

Abstract

The present invention belongs to the technical field of reinforcement grouting. The present invention discloses a permeation gradient grouting system for the surrounding rock of a concrete shaft wall, which includes a storage and feeding mechanism, a conveying mechanism for mixing the substances in the storage and feeding mechanism, a metal electrode grouting pipe for grouting, and an injection mechanism located between the conveying mechanism and the metal electrode grouting pipe to provide grouting power. A guiding transition mechanism is arranged between the water tank in the storage and feeding mechanism and the conveying pipeline of the conveying mechanism, and other substances in the storage and feeding mechanism are separately communicated with the conveying mechanism; the slurry mixed by the conveying mechanism in the initial stage is in the optimal fluidity stage under the influence of polycarboxylate water reducer. The fluidity of the slurry in the later stage is slightly lower than that in the initial stage, but the curing time is shortened. And due to the increase in the feeding time of the slurry in the initial stage, the curing time of the slurry in the initial and later stages can be balanced at this time, thereby shortening the overall complete curing time.

Description

Technical Field

[0001] The present invention relates to the technical field of reinforcement grouting, and specifically to a permeation gradient grouting system for the surrounding rock of a concrete shaft wall. Background Art

[0002] When the concentration of nano-silica sol reaches a certain level, the nano-silica sol can be fully mixed with other substances, showing good adhesion ability, accelerating the agglomeration and sedimentation of cement particles, which is not conducive to the fluidity of the slurry. The change in the initial viscosity of the slurry is the combined effect of various conditions. Adding a small amount of water reducer can improve the fluidity of the slurry, and the reasonable range for adding polycarboxylate superplasticizer is within 0.1% - 0.4%.

[0003] When the silica sol penetrates the cracks in the surrounding rock of the shaft wall, the first-injected silica sol first enters the cracks. At this time, the subsequently injected silica sol pushes the silica sol in the front cracks to continue to move forward. And as the subsequent injection continues, the viscosity of the initially injected silica sol gradually increases with time. As the silica sol in the front penetrates deeper into the cracks, the cracks become narrower. Along with the increase in its own viscosity, it becomes difficult to fill the subsequent cracks. If the fluidity of the slurry is uniformly adjusted to a high-fluidity state, it will increase the subsequent curing time.

[0004] The Chinese patent discloses a grouting method for rock and soil mass, with the publication number (CN104612131A). This patent utilizes the characteristic that the fluidity of the slurry increases when the temperature rises to obtain a larger diffusion radius of the slurry in the pores and fractures of the rock and soil mass. However, in actual application, multiple grouting pipes are injected synchronously, and a heating device is used for heating. At this time, a heat preservation structure needs to be set up to reduce the heat loss of the slurry during transportation. At the same time, in cold weather periods, when the liquid enters the cracks, the heat loss speed increases. As the cracks deepen, the thickness of the slurry actually located deep in the cracks is small and the surface area is large, resulting in the rapid removal of the heat of the slurry at this place by the rock and rapid cooling, leading to too rapid a decrease in viscosity. However, with the continuous heat exchange of the subsequent liquid, there are many problems to be overcome, resulting in a cumbersome grouting process. Summary of the Invention

[0005] The purpose of the present invention is to provide a permeation gradient grouting system for the surrounding rock of a concrete shaft wall to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A permeation gradient grouting system for the surrounding rock of a concrete shaft wall, comprising a storage and feeding mechanism, a conveying mechanism for mixing substances in the storage and feeding mechanism, a metal electrode grouting pipe for grouting, and an injection mechanism for providing grouting power between the conveying mechanism and the metal electrode grouting pipe. A guiding transition mechanism is arranged between the water tank in the storage and feeding mechanism and the conveying pipeline of the conveying mechanism. Other substances in the storage and feeding mechanism are separately communicated with the conveying mechanism. On one side of the guiding transition mechanism, there is a slurry flow feeding mechanism for evenly feeding a flow aid by utilizing the power of liquid flow. Inside the feeding end of the slurry flow feeding mechanism, there is a feeding volume adjusting mechanism for equally reducing the feeding amount of the slurry flow feeding mechanism as the liquid flow time increases.

[0008] As a further scheme of the present invention: the bottom of the slurry flow feeding mechanism is provided with an extension pipe that is inclined and connected to the inside of the guiding transition mechanism. The end of the extension pipe is fixedly connected with a support seat concentric with the guiding transition mechanism. The top of the support seat is rotatably connected with an impeller that rotates as the liquid flows.

[0009] As a further scheme of the present invention: the top of the support seat is provided with a sealed feeding cavity. The bottom of the impeller is fixedly connected with an embedded feeding pipe that rotates inside the sealed feeding cavity. The inside of the extension pipe is provided with a conveying channel communicated with the slurry flow feeding mechanism. The side of the embedded feeding pipe is provided with an auxiliary agent collecting bin communicated with the conveying channel.

[0010] As a further scheme of the present invention: both ends of the auxiliary agent collecting bin are of an open structure. The feeding volume adjusting mechanism includes a blocking volume adjusting block slidably connected inside the auxiliary agent collecting bin and a bracket fixed on the inner wall of the embedded feeding pipe. A distance adjusting screw is rotatably connected to the bracket. A threaded hole screwed with the distance adjusting screw is opened on the blocking volume adjusting block. The top of the support seat is fixedly connected with a central seat, and an adjusting tooth is fixedly connected to the central seat. The tail end of the distance adjusting screw is fixedly connected with a transmission gear that cooperates with the adjusting tooth.

[0011] As a further scheme of the present invention: a feeding port matching the auxiliary agent collecting bin is opened on one side of the support seat away from the extension pipe.

[0012] As a further scheme of the present invention: the width of the conveying channel is greater than the width of the auxiliary agent collecting bin.

[0013] As a further scheme of the present invention: a positioning ring is fixedly connected to the middle of the bracket, and the distance adjusting screw is rotatably connected to the positioning ring.

[0014] At the initial stage of grouting

[0015] The material is conveyed to the conveying mechanism by the storage and feeding mechanism. When the liquid passes through the guiding and transition mechanism, due to the action of the water flow, the impeller rotates under the influence of the water flow. At this time, the impeller rotates relative to the support seat. The polycarboxylate superplasticizer located inside the slurry flow and feeding mechanism flows into the inside of the support seat along the conveying channel. Since the bottom of the impeller is fixedly connected with an embedded feeding pipe, when the embedded feeding pipe rotates with the impeller, the auxiliary agent collection bin rotates to the conveying channel. At this time, due to the inclination of the extension pipe, the material enters the auxiliary agent collection bin under the influence of gravity. As the impeller continues to rotate, the auxiliary agent collection bin rotates to the feeding port. At this time, the polycarboxylate superplasticizer quickly mixes with the liquid inside the guiding and transition mechanism. Then, the liquid with the polycarboxylate superplasticizer enters the conveying mechanism and mixes with other ingredients of the storage and feeding mechanism, and is then conveyed into the metal electrode grouting pipe through the injection mechanism, flows out through the holes on the outer wall of the metal electrode grouting pipe, and penetrates into the gap, slowly penetrating deep into the gap.

[0016] Initial slurry

[0017] At this time, since the initial slurry first enters the gap, with the subsequent input of slurry, the initial slurry reaches the deep part of the gap first with the passage of time and the pushing of the subsequent slurry. Since a period of time has passed from the initial slurry to the later stage, the fluidity of the initial slurry becomes poor at this time. Therefore, the proportion of the polycarboxylate superplasticizer in the initial slurry to maintain the maximum fluidity of the slurry is such that the depth of the auxiliary agent collection bin is at the maximum value at this time. The fluidity of the initial slurry needs to be maintained at the best level, so the dosage of the polycarboxylate superplasticizer needs to be increased. Therefore, the plugging volume adjustment block is located at the innermost side at this time, maximizing the depth from the open end of the outer wall of the auxiliary agent collection bin to the end face of the plugging volume adjustment block. Thus, when the impeller rotates to the feeding port, the dosage of the polycarboxylate superplasticizer discharged is maximized, making the slurry mixed by the conveying mechanism in the initial stage in the optimal fluidity stage under the influence of the polycarboxylate superplasticizer.

[0018] Later fluidity adjustment

[0019] With the input of the initial slurry, the later slurry mainly pushes the initial slurry to flow deep into the gap. The injection end of the gap often has a larger opening and gradually narrows as the depth of the gap increases. Therefore, at this time, the decrease in the fluidity of the slurry has little or no impact on the filling effect of the gap. At this time, although the initial slurry has good fluidity but a long curing time, while the fluidity of the later slurry is relatively lower than that of the initial stage, but the curing time is shortened. And because the input time of the initial slurry increases, the curing times of the initial and later slurries can be balanced at this time, thereby shortening the overall complete curing time.

[0020] Dosage change

[0021] As the liquid flows inside the guiding transition mechanism, the number of rotations of the impeller gradually increases. When the impeller rotates on the support seat, the bracket on the inner wall of the embedded feeding pipe revolves after rotating with the embedded feeding pipe. At this time, when the transmission gear revolves with the bracket, affected by the positioning ring, the transmission gear will contact the adjusting tooth when rotating, and will contact the adjusting tooth above the central seat. At this time, the transmission gear drives the distance-adjusting screw to rotate a certain angle. Since the plugging volume adjustment block is slidably connected inside the feeding port, at this time, the threaded hole is affected by the rotation of the distance-adjusting screw, causing the plugging volume adjustment block to have a relative displacement inside the auxiliary agent collection bin, and then pushing the plugging volume adjustment block outwards from the auxiliary agent collection bin, so that the distance between the port of the auxiliary agent collection bin and the plugging volume adjustment block is reduced, and the amount of polycarboxylate water reducer collected each time the auxiliary agent collection bin rotates to the conveying channel is reduced. When the rotation speed of the impeller remains unchanged, the amount of polycarboxylate water reducer put into the liquid at this time is reduced, and then the fluidity of the slurry mixed by the subsequent conveying mechanism is lower than that at the initial stage, but it can still meet the use requirements.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] When the liquid passes through the guiding transition mechanism, the impeller is affected by the water flow and rotates. When the embedded feeding pipe rotates with the impeller, the auxiliary agent collection bin rotates to the conveying channel, and the polycarboxylate water reducer is quickly mixed with the liquid inside the guiding transition mechanism. At this time, the liquid with the polycarboxylate water reducer enters the conveying mechanism and is mixed with other ingredients of the storage and feeding mechanism, and then is conveyed into the metal electrode grouting pipe through the injection mechanism, and flows out through the holes on the outer wall of the metal electrode grouting pipe and penetrates into the gap, and slowly penetrates deep into the gap. The fluidity of the slurry in the initial stage needs to be kept optimal, so the dosage of the polycarboxylate water reducer needs to be increased. Therefore, at this time, the plugging volume adjustment block is located at the innermost side, maximizing the depth from the open end of the outer wall of the auxiliary agent collection bin to the end face of the plugging volume adjustment block. Thus, when the impeller rotates to the feeding port, the amount of polycarboxylate water reducer put in is maximized, so that the slurry mixed by the conveying mechanism in the initial stage is in the optimal fluidity stage under the influence of the polycarboxylate water reducer. As the initial slurry is put in, the later slurry mainly pushes the initial slurry to flow deep into the gap, and the injection end of the gap often has a larger opening and gradually shrinks as the depth of the gap increases. Therefore, the reduction of the fluidity of the slurry at this time has little or no influence on the filling effect of the gap. The fluidity of the later slurry is lower than that in the initial stage, but the curing time is shortened. And because the putting time of the initial slurry is increased, the curing time of the initial and later slurries can be balanced at this time, thereby shortening the overall complete curing time. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the composition of a permeation gradient grouting system for the surrounding rock of a concrete shaft wall;

[0026] Figure 2 It is a schematic sectional view of the guiding transition mechanism in a permeation gradient grouting system for the surrounding rock of a concrete shaft wall;

[0027] Figure 3 It is a three-dimensional schematic diagram of the slurry flow and feeding mechanism in a permeation gradient grouting system for the surrounding rock of a concrete shaft wall;

[0028] Figure 4 It is a schematic sectional view of the support base in a permeation gradient grouting system for the surrounding rock of a concrete shaft wall;

[0029] Figure 5 It is a schematic diagram of the cooperation between the transmission gear and the central seat in a permeation gradient grouting system for the surrounding rock of a concrete shaft wall;

[0030] Figure 6 It is a top view schematic diagram of the auxiliary agent collection bin in a permeation gradient grouting system for the surrounding rock of a concrete shaft wall;

[0031] Figure 7 It is Figure 4 an enlarged schematic diagram of part A in

[0032] In the figure: 1. Storage and feeding mechanism; 2. Guiding transition mechanism; 3. Slurry flow and feeding mechanism; 31. Extension pipe; 311. Delivery channel; 32. Support base; 321. Feeding port; 322. Sealed feeding cavity; 323. Central seat; 324. Adjusting tooth; 33. Impeller; 331. Embedded feeding pipe; 332. Auxiliary agent collection bin; 4. Conveying mechanism; 5. Injection mechanism; 6. Metal electrode grouting pipe; 7. Feeding volume adjusting mechanism; 71. Bracket; 72. Positioning ring; 73. Spacing adjusting screw; 731. Transmission gear; 74. Blocking volume adjusting block; 741. Threaded hole. Detailed implementation manners

[0033] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , the composition of the present invention

[0034] It includes a storage and feeding mechanism 1, a conveying mechanism 4 for mixing substances in the storage and feeding mechanism 1, a metal electrode grouting pipe 6 for grouting, and an injection mechanism 5 that provides grouting power between the conveying mechanism 4 and the metal electrode grouting pipe 6. A guiding transition mechanism 2 is arranged between the water tank in the storage and feeding mechanism 1 and the conveying pipeline of the conveying mechanism 4. Other substances in the storage and feeding mechanism 1 are separately connected to the conveying mechanism 4. On one side of the guiding transition mechanism 2, there is a slurry flow feeding mechanism 3 that uses the power of liquid flow to evenly feed a flow aid. Inside the feeding end of the slurry flow feeding mechanism 3, there is a feeding volume adjustment mechanism 7 that reduces the feeding amount of the slurry flow feeding mechanism 3 equally as the liquid flow time increases. On the side of the support base 32 away from the extension pipe 31, there is a feeding port 321 that matches the auxiliary agent collection bin 332;

[0035] The storage and feeding mechanism 1 is mainly composed of multiple storage tanks, storing nano-silica sol, ultra-fine fly ash, water, etc. The component materials are mainly stored separately and mixed during use;

[0036] The guiding transition mechanism 2 is connected between the water tank in the storage and feeding mechanism 1 and the conveying mechanism 4. When water is injected into the conveying mechanism 4 through the storage and feeding mechanism 1, the water passes through the guiding transition mechanism 2 and adds auxiliary materials to the inside in cooperation with the slurry flow feeding mechanism 3. The auxiliary material is preferably a polycarboxylate water reducer;

[0037] The slurry flow feeding mechanism 3 is arranged on one side of the guiding transition mechanism 2. The polycarboxylate water reducer is stored inside the slurry flow feeding mechanism 3. The bottom of the slurry flow feeding mechanism 3 enters the inside of the guiding transition mechanism 2 through the extension pipe 31. The impeller 33 rotates above the support base 32. At this time, through the water flow, the impeller 33 rotates, thereby driving the polycarboxylate water reducer inside the slurry flow feeding mechanism 3 to be evenly fed into the water flow and enter the conveying mechanism 4 for mixing;

[0038] The injection mechanism 5 is mainly used to transport the liquid inside the conveying mechanism 4 to the metal electrode grouting pipe 6, and the liquid is transported to the reinforcement point through the metal electrode grouting pipe 6;

[0039] The purpose of the feeding volume adjustment mechanism 7 is to reduce the volume of the auxiliary agent collection bin 332 as the rotation time of the impeller 33 increases, but the water flow speed remains unchanged. At this time, the added dosage of the polycarboxylate water reducer gradually decreases, so that the fluidity of the subsequent slurry is less than that of the previous slurry, but still can meet the use requirements, reduce the material consumption, and at the same time shorten the curing time.

[0040] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4, Figure 5 , Figure 6 , Figure 7 , the use process of the present invention

[0041] Prepare

[0042] Preparation of the metal electrode grouting pipe 6. The metal electrode grouting pipe 6 is made of galvanized steel pipe. A hole is drilled at a distance from the top of the steel pipe. The steel pipe is connected to the wire with screws and sealed twice with tape and electrical tape. Holes are opened on the outer wall of the metal electrode grouting pipe 6 and wrapped with cloth and net to ensure that the slurry can flow out smoothly. At this time, the storage and delivery mechanism 1 is placed in the working area, and the storage and delivery mechanism 1, the guide transition mechanism 2, the conveying mechanism 4, the injection mechanism 5 and the metal electrode grouting pipe 6 are laid out and connected.

[0043] Initial stage of grouting

[0044] An extension pipe 31 obliquely connected to the inside of the guide transition mechanism 2 is provided at the bottom of the slurry flow delivery mechanism 3, and a support seat 32 concentric with the guide transition mechanism 2 is fixedly connected at the end of the extension pipe 31, and an impeller 33 rotating with the flow of liquid is rotatably connected to the top of the support seat 32, and a sealed feeding chamber 322 is provided at the top of the support seat 32, and an embedded feeding pipe 331 rotating inside the sealed feeding chamber 322 is fixedly connected to the bottom of the impeller 33, and a conveying channel 311 connected to the slurry flow delivery mechanism 3 is provided inside the extension pipe 31, and an auxiliary agent collection bin 332 connected to the conveying channel 311 is provided on the side of the embedded feeding pipe 331, and the width of the conveying channel 311 is greater than that of the auxiliary agent collection bin 332, which can prevent the conveying channel 311 from rotating too fast and rotating to the outside without completely collecting the material;

[0045] The material is transported to the conveying mechanism 4 through the storage and delivery mechanism 1. When the liquid passes through the guide transition mechanism 2, the impeller 33 is affected by the water flow and rotates. At this time, the impeller 33 and the support seat 32 rotate relative to each other. The polycarboxylic acid water reducer located inside the slurry flow delivery mechanism 3 flows into the inside of the support seat 32 along the delivery channel 311. Since the bottom of the impeller 33 is fixedly connected with an embedded feeding pipe 331, when the embedded feeding pipe 331 rotates with the impeller 33, the auxiliary agent collection bin 332 rotates to the delivery channel 311. At this time, the auxiliary agent collection bin 332 rotates to the delivery channel 311. As the extension pipe 31 is tilted, the material enters the auxiliary agent collection bin 332 under the influence of gravity. As the impeller 33 continues to rotate, the auxiliary agent collection bin 332 rotates to the delivery port 321. At this time, the polycarboxylate water reducer quickly mixes with the liquid in the guide transition mechanism 2. At this time, the liquid with the polycarboxylate water reducer enters the conveying mechanism 4 and is mixed with other ingredients of the storage and delivery mechanism 1. It is then conveyed to the metal electrode grouting pipe 6 through the injection mechanism 5, flows out through the pores on the outer wall of the metal electrode grouting pipe 6, penetrates into the gap, and slowly penetrates deep into the gap.

[0046] Initial slurry

[0047] At this time, since the initial slurry enters the inside of the gap first, with the subsequent input of the slurry, the initial slurry reaches the deep part of the gap first as time increases and is pushed by the subsequent slurry. Since a period of time has passed since the initial slurry and the later slurry, the fluidity of the initial slurry becomes poor at this time. Therefore, the proportion of the polycarboxylate water reducer in the initial slurry to maintain the maximum fluidity of the slurry is such that the depth of the auxiliary agent collection bin 332 is at the maximum value at this time. The fluidity of the initial slurry needs to be maintained at the best, so the dosage of the polycarboxylate water reducer needs to be increased. Therefore, the plugging volume adjustment block 74 is located at the innermost side at this time, maximizing the depth from the open end of the outer wall of the auxiliary agent collection bin 332 to the end face of the plugging volume adjustment block 74. Thus, when the impeller 33 rotates to the dosing port 321, the dosage of the polycarboxylate water reducer dropped is maximized, and the slurry mixed by the initial conveying mechanism 4 is in the optimal fluidity stage under the influence of the polycarboxylate water reducer.

[0048] Late fluidity adjustment

[0049] With the input of the initial slurry, the later slurry mainly pushes the initial slurry to flow deep into the gap. The injection end of the gap often has a larger opening and gradually narrows as the depth of the gap increases. Therefore, the decrease in the fluidity of the slurry at this time has little or no impact on the filling effect of the gap. At this time, although the initial slurry has good fluidity but a long curing time, the fluidity of the later slurry is relatively lower than that of the initial slurry, but the curing time is shortened. Also, due to the increase in the input time of the initial slurry, the curing times of the initial and later slurries can be balanced at this time, thereby shortening the overall complete curing time.

[0050] Dosage change

[0051] Both ends of the auxiliary agent collection bin 332 are open structures. The dosing volume adjustment mechanism 7 includes a plugging volume adjustment block 74 slidably connected inside the auxiliary agent collection bin 332 and a bracket 71 fixed to the inner wall of the embedded feed pipe 331. A distance adjustment screw 73 is rotatably connected to the bracket 71. A threaded hole 741 screwed with the distance adjustment screw 73 is provided on the plugging volume adjustment block 74. A center seat 323 is fixedly connected to the top of the support seat 32, and an adjustment gear 324 is fixedly connected to the center seat 323. A transmission gear 731 matched with the adjustment gear 324 is fixedly connected to the tail end of the distance adjustment screw 73. A positioning ring 72 is fixedly connected to the middle of the bracket 71, and the distance adjustment screw 73 is rotatably connected to the positioning ring 72;

[0052] As the liquid flows inside the guiding transition mechanism 2, the number of rotation cycles of the impeller 33 gradually increases. When the impeller 33 rotates on the support seat 32, the bracket 71 located on the inner wall of the embedded feeding pipe 331 revolves after rotating with the embedded feeding pipe 331. At this time, when the transmission gear 731 revolves with the bracket 71, affected by the positioning ring 72, the transmission gear 731 will contact the adjusting tooth 324 when rotating, and will contact the adjusting tooth 324 above the central seat 323. At this time, the transmission gear 731 drives the distance adjusting screw 73 to rotate a certain angle. Since the plugging volume adjusting block 74 is slidably connected inside the feeding port 321, at this time, the threaded hole 741 is affected by the rotation of the distance adjusting screw 73, causing the plugging volume adjusting block 74 to have a relative displacement in the auxiliary agent collection bin 332, and then the plugging volume adjusting block 74 is pushed out of the auxiliary agent collection bin 332, so that the distance between the port of the auxiliary agent collection bin 332 and the plugging volume adjusting block 74 is reduced, and the amount of polycarboxylate water reducing agent collected by the auxiliary agent collection bin 332 each time it rotates to the conveying channel 311 is reduced. When the rotation speed of the impeller 33 remains unchanged, the amount of polycarboxylate water reducing agent put into the liquid at this time is reduced, and then the fluidity of the slurry mixed by the subsequent conveying mechanism 4 is lower than that in the initial stage, but it can still meet the use requirements.

[0053] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A permeation gradient grouting system for the surrounding rock of a concrete shaft wall, comprising a storage and feeding mechanism (1), a conveying mechanism (4) for mixing the substances in the storage and feeding mechanism (1), a metal electrode grouting pipe (6) for grouting, and an injection mechanism (5) located between the conveying mechanism (4) and the metal electrode grouting pipe (6) to provide grouting power, characterized in that, A guiding and transition mechanism (2) is provided between the water tank in the storage and feeding mechanism (1) and the conveying pipeline of the conveying mechanism (4). Other substances in the storage and feeding mechanism (1) are separately communicated with the conveying mechanism (4). A slurry flow feeding mechanism (3) for evenly feeding a flow assisting agent by utilizing the power of liquid flow is arranged on one side of the guiding and transition mechanism (2). A feeding volume adjusting mechanism (7) for equally reducing the feeding amount of the slurry flow feeding mechanism (3) as the liquid flow time increases is arranged inside the feeding end of the slurry flow feeding mechanism (3). An extension pipe (31) inclined and communicated to the inside of the guiding and transition mechanism (2) is arranged at the bottom of the slurry flow feeding mechanism (3). A support seat (32) concentric with the guiding and transition mechanism (2) is fixedly connected to the end of the extension pipe (31). An impeller (33) that rotates as the liquid flows is rotatably connected to the top of the support seat (32). A sealed feeding cavity (322) is formed at the top of the support seat (32). An embedded feeding pipe (331) that rotates inside the sealed feeding cavity (322) is fixedly connected to the bottom of the impeller (33). A conveying channel (311) communicated with the slurry flow feeding mechanism (3) is formed inside the extension pipe (31). An auxiliary agent collecting bin (332) communicated with the conveying channel (311) is formed on the side of the embedded feeding pipe (331). Both ends of the auxiliary agent collecting bin (332) are of an open structure. The feeding volume adjusting mechanism (7) includes a plugging volume adjusting block (74) slidably connected inside the auxiliary agent collecting bin (332) and a bracket (71) fixed to the inner wall of the embedded feeding pipe (331). An adjusting screw rod (73) is rotatably connected to the bracket (71). A threaded hole (741) screwed with the adjusting screw rod (73) is formed on the plugging volume adjusting block (74). A central seat (323) is fixedly connected to the top of the support seat (32). An adjusting tooth (324) is fixedly connected to the central seat (323). A transmission gear (731) matched with the adjusting tooth (324) is fixedly connected to the tail end of the adjusting screw rod (73).

2. The grouting system for the seepage gradient of the surrounding rock of a concrete shaft wall according to claim 1, wherein: A feeding port (321) matched with the auxiliary agent collecting bin (332) is formed on one side of the support seat (32) away from the extension pipe (31). The width of the conveying channel (311) is greater than the width of the auxiliary agent collecting bin (332).

3. The permeation gradient grouting system for the surrounding rock of a concrete shaft wall according to claim 1, wherein: A positioning ring (72) is fixedly connected to the middle of the bracket (71). The adjusting screw rod (73) is rotatably connected to the positioning ring (72).

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