A construction method and system for eliminating mud skin weakening effect at pile-wall joints

Abstract

The invention discloses a construction method and system for eliminating the weakening effect of mud skin on a pile-wall joint, comprising a closed grouting module, an open grouting module and a distributed grouting module, wherein the closed grouting module and the open grouting module are respectively fixed on the outer side and the inner side of a steel cage of a ground-connected wall, the distributed grouting module comprises a lifting and positioning device, a grouting pipe and a distributed grouting device, the lifting and positioning device is connected to the distributed grouting device through a steel cable, so as to lift and lower the distributed grouting device or keep it at a fixed depth, the distributed grouting device comprises a water pipe, a grouting stopper and a grouting core pipe, the grouting core pipe is connected to the grouting pipe, a grouting port is arranged on the side wall of the grouting core pipe, the expansion of the grouting stopper is controlled by water pressure to form a closed space with the grouting pipe, and the distributed grouting device is adjusted to different depths so that the grouting port corresponds to the grouting outlet position, thereby solving the problem of poor connection stiffness between the interlocking pile and the ground-connected wall caused by mud skin in the construction of the pile-wall composite structure.

Description

Technical Field

[0001] The present invention relates to the field of geotechnical engineering technology, and more specifically, to a construction method and system for eliminating mud skin weakening effect at a pile-wall joint. Background Art

[0002] The pile-wall composite structure has the advantages of strong bearing capacity, high overall rigidity, and adaptability to various complex geological conditions. As part of the permanent bearing structure of the foundation, compared with the previous conventional deep foundation pit excavation process of the ground-connected wall, it can avoid large-scale soil excavation, improve the project progress and construction efficiency, and reduce the risk of deep foundation pit construction. When constructing the pile-wall composite structure, the large-diameter pile foundation is completed first, and then the ground-connected wall groove section is completed between the piles using a groove washing machine. As an overall coordinated force system, the connection performance of the pile and the wall has a greater impact on the load transfer and bearing performance.

[0003] The existing technology has the following disadvantages: (1) When constructing the trench section of the ground-connected wall, the mud wall protection method is generally used for trench construction. When the ground-connected wall and pile combination structure is used as a vertical bearing structure, due to the mud skin between the wall side and the pile side, the synergistic force performance of the pile-wall combination structure cannot be effectively exerted, and it has an adverse effect on the long-term durability and waterproof performance of the joints; (2) At the connection between the pile and the wall, especially when the outer joints are reinforced, the grouting slurry is easy to flow outward, resulting in ineffective diffusion. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a system for eliminating the weakening effect of the mud skin at the pile-wall joint, including a closed grouting module, an open grouting module and a distributed grouting module. The closed grouting module and the open grouting module are respectively fixed to the outer side and the inner side of the ground-connected wall steel cage. The distributed grouting module includes a lifting and positioning device, a grouting pipe and a distributed grouting device. The lifting and positioning device is connected to the distributed grouting device through a steel cable to lift the distributed grouting device or keep it at a fixed depth. The distributed grouting device includes a water The grouting core pipe is connected with the grouting pipe. A grouting port is arranged on the side wall of the grouting core pipe, which is the outflow channel of cement slurry. Grouting plugs are fixed above and below the grouting port respectively. The distance between the two grouting plugs should ensure that there is only one pair of grouting ports within the span. The expansion of the grouting plugs is controlled by water pressure to form a closed space with the grouting pipe. The distributed grouting device is adjusted to different depths so that the positions of the grouting port and the grouting port correspond to each other, thereby solving the problem of poor connection stiffness between the bite pile and the ground-connected wall caused by mud skin in the construction of the pile-wall composite structure.

[0005] In order to achieve the above object, according to one aspect of the present invention, a system for eliminating the weakening effect of mud skin at a pile-wall joint is provided, comprising:

[0006] A closed grouting module provided at the joint between the outer side of the ground-connected wall reinforcement cage and the interlocking pile, an open grouting module provided at the joint between the end of the ground-connected wall reinforcement cage and the interlocking pile, and a distributed grouting module for grouting the above modules;

[0007] The distributed grouting module includes a lifting and positioning device and a distributed grouting device. The distributed grouting device is respectively arranged in the closed grouting module and the open grouting module to realize the flushing of the mud skin inside and outside the ground-connected wall reinforcement cage. The lifting and positioning device pulls the distributed grouting device to different elevations. The distributed grouting device includes a water pipe, a grouting plug and a grouting core pipe. The grouting core pipe grouts the closed grouting module and the open grouting module through a grouting port. The grouting plug is respectively fixed on the upper and lower sides of the grouting port. The water pipe forms water pressure in the grouting plug. The grouting plug expands and seals the upper and lower spaces of the grouting port to realize layered grouting and reinforcement of the mud wall residue.

[0008] Furthermore, the closed grouting module includes an inner grouting pipe, and the open grouting module includes an outer grouting pipe. The inner grouting pipe and the outer grouting pipe are vertically fixed to the side of the ground-anchored wall steel cage, and both are provided with grouting outlets serving as grouting channels. The grouting core pipe is gap-fitted in the inner grouting pipe and the outer grouting pipe.

[0009] Furthermore, the distributed grouting module includes a grouting pipe, and the grouting pipe is connected to the grouting core pipe as a channel for pumping cement slurry.

[0010] Furthermore, the open grouting module includes an expansion capsule, which is coated on the outer grouting pipe. The grouting core pipe injects grout into the expansion capsule to expand it, so as to limit the flow range of the slurry.

[0011] Furthermore, the grouting plug includes a high-pressure rubber and a fixing sleeve, and the fixing sleeve seals and fixes the two ends of the high-pressure rubber to the surface of the grouting core tube. The three form a closed space. The water pipe is connected to the closed space to form water pressure. The water pressure causes the high-pressure rubber to expand and tightly adhere to the inner grouting tube and the inner wall of the inner grouting tube, thereby forming a sealed space outside the grouting port to achieve grouting of the grouting outlet with a fixed depth.

[0012] Furthermore, the distributed grouting module includes a grouting pump and a suspension device, the lifting and positioning device is connected to the suspension device through a steel cable, the suspension device suspends the distributed grouting device through the steel cable, and the lifting and positioning device outputs power to lift and lower the distributed grouting device or keep it at a fixed elevation.

[0013] Furthermore, the suspension device includes a suspension wheel and a suspension frame, the suspension frame is erected above the distributed grouting device, the suspension wheel is fixed on the suspension frame corresponding to the position and number of the distributed grouting device, and the suspension wheel provides support for the steel cable.

[0014] According to another aspect of the present invention, there is provided a method for constructing a system for eliminating the weakening effect of mud skin at a pile-wall joint, comprising the following steps:

[0015] S100, fixing the grouting module, arranging the grouting module on the side of the ground-connected wall steel cage, fixing the open grouting module along the steel cage extending into the end of the interlocking pile, i.e. the inner side, and fixing the closed grouting module along the position where the steel cage connects with the outer side of the interlocking pile, i.e. the outer side, the inner grouting pipe and the outer grouting pipe are arranged vertically, and fixing the expansion capsule on the outer grouting pipe;

[0016] S200, lowering the steel cage into the groove, sealing the ends of the inner grouting pipe and the outer grouting pipe to prevent mud from entering the pipe when the steel cage is sunk, and lowering the steel cage into the ground-connected wall groove;

[0017] S300, grouting inside the ground-connected wall. After the concrete pouring of the ground-connected wall is completed and reaches the age, the distributed grouting device is lowered into the inner grouting pipe, so that the grouting port corresponds to the grouting outlet of the required grouting depth. The designed grouting pressure is set on the grouting pump, and the open grouting module is used to grout the inside of the ground-connected wall, flush the mud skin, slag and impurities around the grouting outlet, and monitor the grouting volume;

[0018] S400, grouting on the outside of the ground-connected wall. The distributed grouting device is lowered into the outside grouting pipe. After the grouting port corresponds to the grouting outlet of the required grouting depth, the outside closed grouting module is activated to inject grout into the expansion capsule, so that the expansion capsule expands to form a capsule enlarged head, forming a closed area to limit the flow range of the grout;

[0019] S500, layered grouting of the ground-anchored wall. The water in the high-pressure rubber is pumped out through a water pipe to relieve the pressure. The grouting core tube is then lowered to the next grouting outlet position that requires grouting through the lifting and positioning device. The water pressure of the high-pressure rubber is restored through the water pipe to make it close to the inner grouting pipe or the outer grouting pipe to form a sealed space. The grouting core tube is then grouted until the designed grouting volume is reached. S300 and S400 are repeated until the grouting cycle of all elevations is completed to achieve the effect of layered grouting and reinforcement of the mud wall residue.

[0020] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0021] 1. The present invention provides a system for eliminating the weakening effect of mud skin on pile-wall joints, comprising a closed grouting module, an open grouting module and a distributed grouting module, wherein the closed grouting module and the open grouting module are respectively fixed on the outer side and the inner side of the steel cage of the ground-connected wall, the distributed grouting module comprises a lifting and positioning device, a grouting pipe and a distributed grouting device, the lifting and positioning device is connected to the distributed grouting device through a steel cable, so as to lift and lower the distributed grouting device or keep it at a fixed depth, the distributed grouting device comprises a water pipe, a grouting plug and a grouting core pipe, the grouting core pipe is connected to the grouting pipe, a grouting port is arranged on the side wall of the grouting core pipe, which is a cement slurry outflow channel, grouting plugs are respectively fixed above and below the grouting port, the spacing between the two grouting plugs should ensure that there is only one pair of grouting ports within the span range, the grouting plug is expanded by controlling the water pressure to form a closed space with the grouting pipe, and the distributed grouting device is adjusted to different depths so that the grouting port corresponds to the grouting port, thereby solving the problem of poor connection stiffness between the bite pile and the ground-connected wall caused by mud skin in the construction of the pile-wall composite structure.

[0022] 2. The present invention provides a system for eliminating the weakening effect of mud skin at the joint of pile and wall. The closed grouting module adopted includes a grouting pipe and an expansion capsule coated on the surface thereof. Grouting is injected into the expansion capsule to cause the expansion capsule to expand to form an enlarged capsule head, thereby forming a relatively closed area, so as to effectively control the flow range of the slurry, form a closed area at the joint of the pile and wall, and avoid ineffective diffusion of the slurry.

[0023] 3. The present invention provides a construction method for eliminating the weakening effect of the mud skin at the joint of the pile and the wall. A closed grouting module and an open grouting module are respectively pre-embedded at the junction of the interlocking pile and the ground-connected wall, that is, at the inner and outer joints. After the ground-connected wall reaches the casting age, grouting treatment is carried out. The inner and outer joints are layeredly grouted through the distributed grouting modules to reinforce the residual mud wall protection, thereby improving the coordinated force and bearing performance of the pile body and the wall body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a construction flow chart of a system for eliminating the weakening effect of mud skin at a pile-wall joint according to an embodiment of the present invention;

[0025] Figure 2 2 is a schematic structural diagram of a system for eliminating mud skin weakening effect at a pile-wall joint according to an embodiment of the present invention;

[0026] Figure 3 It is a cross-sectional view of a closed grouting device of a system for eliminating the weakening effect of mud skin at a pile-wall joint according to an embodiment of the present invention;

[0027] Figure 4 It is a top view of a system for eliminating mud skin weakening effect at a pile-wall joint according to an embodiment of the present invention.

[0028] In all the drawings, the same figure numbers represent the same technical features, specifically: 1-lifting and positioning device, 2-grouting pump, 3-grouting pipe, 4-suspension device, 5-distributed grouting device, 6-inner grouting pipe, 7-outer grouting pipe, 8-grouting outlet, 9-expansion capsule, 41-hanging wheel, 42-suspension frame, 51-water pipe, 52-grouting plug, 53-grouting core pipe, 521-high-pressure rubber, 522-fixing sleeve, 531-grouting outlet. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figure 1-Figure 4 As shown, the present invention provides a system for eliminating the weakening effect of mud skin at the joint of pile and wall, including a closed grouting module, an open grouting module and a distributed grouting module, wherein the closed grouting module is arranged at the intersection of the outer side of the ground-connected wall and the bite pile, and the pile-wall joint is blocked by cooperating with the distributed grouting module to form a closed space at the joint, the open grouting module is arranged at the end of the bite pile embedded in the inner side of the ground-connected wall, and the mud wall residue is reinforced by cooperating with the distributed grouting module, and the distributed grouting module includes a lifting and positioning device 1, a grouting pump 2, a grouting pipe 3, a suspension device 4 and a distributed grouting device 5, Among them, the lifting and positioning device 1 is connected to the suspension device 4 through a steel cable, the suspension device 4 is erected on the ground above the distributed grouting device 5, the steel cable is connected to the distributed grouting device 5, the lifting and positioning device 1 outputs power through the steel cable, so as to lift and lower the distributed grouting device 5 or keep it at a fixed depth, and the grouting pump 2 is connected to the distributed grouting device 5 through the grouting pipe 3, which is used to pump cement slurry into the distributed grouting device 5, so as to achieve the effect of layered grouting on the inside and outside of the pile-wall connection, thereby solving the problem of poor connection stiffness between the bite pile and the ground-connected wall caused by mud skin in the construction of the pile-wall composite structure.

[0031] Furthermore, if Figure 2-Figure 4As shown, the open grouting module includes an inner grouting pipe 6 and a grouting outlet 8. The inner grouting pipe 6 is located at the end of the ground-connected wall extending into the bite pile. Specifically, the inner grouting pipe 6 is vertically arranged and fixed to the end of the steel cage of the ground-connected wall. It is lowered together with the steel cage for pre-embedded. The closed grouting module includes an outer grouting pipe 7, a grouting outlet 8 and an expansion capsule 9. The outer grouting pipe 7 is located at the junction of the ground-connected wall and the outer edge of the bite pile, fixed to the outside of the steel cage, and also pre-embedded. The expansion capsule 9 is coated on the surface of the outer grouting pipe 7. By grouting the expansion capsule 9, a relatively closed area can be formed, which can effectively control The flow range of the slurry, further, the slurry outlet 8 is arranged on the side walls of the inner grouting pipe 6 and the outer grouting pipe 7, and is arranged in pairs at different depths of the side walls, which is the grouting channel of the cement slurry. Preferably, since the inner grouting pipe 6 and the outer grouting pipe 7 are tubular structures connected up and down, when they are sunk together with the steel cage, sealing plugs are provided at the ends of both to prevent mud from seeping into the pipes and blocking the grouting pipelines. After the pouring of the ground-anchored wall concrete is completed, the grouting pipe 3 is respectively connected to the inner grouting pipe 6 and the outer grouting pipe 7, so as to pump cement slurry to the distributed grouting device 5.

[0032] Furthermore, if Figure 2-Figure 4 As shown, the distributed grouting device 5 includes a water pipe 51, a grouting plug 52 and a grouting core pipe 53, wherein the grouting core pipe 53 is connected to the grouting pipe 3, and is connected to the inner grouting pipe 6 and the outer grouting pipe 7, both of which have diameters smaller than the inner grouting pipe 6 and the outer grouting pipe 7, to ensure that they can slide smoothly inside the grouting core pipe 53, and a grouting port 531 is provided on the side wall of the grouting core pipe 53, which is a cement slurry outflow channel, preferably, the grouting port 531 corresponds to the position of the grouting outlet 8, and the grouting plug 52 is fixed to the outer side of the grouting core pipe 53, specifically, grouting plugs 52 are respectively fixed above and below the grouting port 531, and the spacing between the two grouting plugs 52 should ensure that there is only one pair of grouting outlets 8 within their span, and further, the grouting plug 52 includes a high-pressure rubber Rubber 521 and fixing sleeve 522, the fixing sleeve 522 seals and fixes the two ends of the high-pressure rubber 521 to the surface of the grouting core tube 53 to form a closed space, and the water pipe 51 passes through the fixing sleeve 522 to communicate with the closed space, and water is pumped into the closed space by the water pipe 51 to form water pressure, so that the high-pressure rubber 521 expands and fits tightly against the inner wall of the inner grouting tube 6 and the inner grouting tube 7, thereby forming a sealed space outside the grouting port 531, and when the grouting port 531 corresponds to the position of the grouting port 8, the sealed space is connected to the outside of the inner grouting tube 6 and the outer grouting tube 7 through the grouting port 8, and the distributed grouting device 5 is pulled to different depths by the lifting positioning device 1 to realize layered grouting.

[0033] Furthermore, if Figure 2 and Figure 3As shown, the suspension device 4 includes a suspension wheel 41 and a suspension frame 42. The suspension frame 42 is erected on the ground above the distributed grouting device 5. A plurality of suspension wheels 41 are arranged on the suspension frame 42. The suspension wheels 41 support the steel cable to pass through. The suspension frame 42 provides a reaction force to suspend the distributed grouting device 5. The latter rises or descends to different depths under the traction of the lifting and positioning device 1, so that the grouting port 531 corresponds to the position of the slurry outlet 8 at different depths.

[0034] like Figure 1-Figure 4 As shown, according to another aspect of the present invention, the present invention provides a construction method for a system for eliminating the weakening effect of mud skin at a pile-wall joint, specifically comprising:

[0035] S100, fixed grouting module;

[0036] Specifically, on the side of the ground-connected wall steel cage, at a certain interval, an open grouting module is fixed along the steel cage extending into the end of the bite pile, that is, the inner side, and a closed grouting module is fixed along the position where the steel cage and the outer edge of the bite pile meet, that is, the outer side, to ensure that the inner grouting pipe 6 and the outer grouting pipe 7 are arranged vertically, and the expansion capsule 9 is fixed to the periphery of the outer grouting pipe 7;

[0037] S200, lower the steel cage into the slot;

[0038] Specifically, the ends of the inner grouting pipe 6 and the outer grouting pipe 7 are sealed with sealing plugs to prevent mud from entering the pipes when the steel cage is sunk, and then the steel cage fixed with the open grouting module and the closed grouting module is lowered into the ground-connected wall groove;

[0039] S300, grouting inside the ground-connected wall;

[0040] Specifically, after the pouring of the ground-connected wall concrete is completed and reaches the age, the distributed grouting device 5 is fixed to the steel cable on the suspension device 4, and the distributed grouting device 5 is lowered into the inner grouting pipe 6 by lifting the positioning device 1, so that the grouting port 531 corresponds to the grouting outlet 8 of the required grouting depth, and then the intelligent grouting control system is used to set the designed grouting pressure on the grouting pump 2, and the open grouting module is used to perform grouting on the inner side of the ground-connected wall, so as to clean up the mud skin, slag and other impurities around the grouting outlet 8, monitor the grouting volume in real time, and grasp the grouting state through the relationship curve of time, grouting pressure and grouting volume;

[0041] S400, grouting on the outside of the ground-connected wall;

[0042] Specifically, the distributed grouting device 5 is lowered into the outer grouting pipe 7. After the grouting port 531 corresponds to the grouting port 8 of the required grouting depth, the outer closed grouting module is activated to inject grout into the expansion capsule 9, so that the expansion capsule expands to form a capsule enlarged head, forming a relatively closed area, so as to effectively control the flow range of the slurry;

[0043] S500, layered grouting of ground-connected walls;

[0044] Specifically, the water in the high-pressure rubber 521 is pumped out by the water pipe 51 to relieve the pressure, and then the grouting core pipe 53 is lowered to the next grouting outlet 8 where grouting is required through the lifting and positioning device 1, and the water pressure of the high-pressure rubber 521 is restored through the water pipe 51 to make it close to the inner grouting pipe 6 or the outer grouting pipe 7 to form a sealed space, and then the grouting core pipe 53 is grouted. Based on the intelligent grouting system, the key grouting indicators are monitored until the designed grouting amount is reached, and S300 and S400 are repeated until the grouting cycle of all elevations is completed to achieve the effect of layered grouting and reinforcement of the mud wall residue.

[0045] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 present invention.

Claims

1. A system for eliminating the weakening effect of mud skin at pile-wall joints, characterized in that: include: A closed grouting module provided at the joint between the outer side of the ground-connected wall reinforcement cage and the interlocking pile, an open grouting module provided at the joint between the end of the ground-connected wall reinforcement cage and the interlocking pile, and a distributed grouting module for grouting the above modules; The distributed grouting module comprises a lifting and positioning device (1) and a distributed grouting device (5). The distributed grouting device (5) is respectively arranged in the closed grouting module and the open grouting module to realize the washing of the mud skin inside and outside the ground-connected wall reinforcement cage. The lifting and positioning device (1) pulls the distributed grouting device (5) to reach different elevations. The distributed grouting device (5) comprises a water pipe (51), a grouting plug (52) and a grouting core pipe (53). The grouting core pipe (53) injects grout into the closed grouting module and the open grouting module through a grouting port (531). The grouting plug (52) is respectively fixed to the upper and lower sides of the grouting port (531). The water pipe (51) forms water pressure in the grouting plug (52). The grouting plug (52) expands and seals the upper and lower spaces of the grouting port (531), thereby realizing layered grouting and reinforcement of the mud wall residue. The open grouting module comprises an inner grouting pipe (6), and the closed grouting module comprises an outer grouting pipe (7). The inner grouting pipe (6) and the outer grouting pipe (7) are vertically fixed to the side of the ground-connected wall steel cage, and both are provided with a grouting outlet (8) serving as a grouting channel. The grouting core pipe (53) is loosely fitted in the inner grouting pipe (6) and the outer grouting pipe (7). The inner grouting pipe (6) and the outer grouting pipe (7) are both tubular structures connected up and down. When they are sunk together with the steel cage, sealing plugs are provided at the ends of the two pipes to prevent mud from seeping into the pipes and blocking the grouting pipes. After the concrete pouring of the ground-connected wall is completed, the grouting pipe (3) is respectively connected to the inner grouting pipe (6) and the outer grouting pipe (7) to pump cement slurry to the distributed grouting device (5); The closed grouting module comprises an expansion capsule (9), wherein the expansion capsule (9) is coated on the outer grouting pipe (7), and the grouting core pipe (53) injects grout into the expansion capsule (9) to expand it, thereby limiting the flow range of the slurry.

2. A system for eliminating the weakening effect of mud skin at pile-wall joints according to claim 1, characterized in that: The distributed grouting module comprises a grouting pipe (3), and the grouting pipe (3) is connected to the grouting core pipe (53) as a channel for pumping cement slurry.

3. A system for eliminating the weakening effect of mud skin at pile-wall joints according to claim 2, characterized in that: The grouting stopper (52) comprises a high-pressure rubber (521) and a fixing sleeve (522); the fixing sleeve (522) seals and fixes the two ends of the high-pressure rubber (521) to the surface of the grouting core tube (53); the three form a closed space; the water pipe (51) is connected to the closed space to form water pressure; the water pressure causes the high-pressure rubber (521) to expand and adhere closely to the inner walls of the inner grouting tube (6) and the outer grouting tube (7); thereby forming a sealed space outside the grouting port (531) to achieve grouting of the grouting outlet (8) at a fixed depth.

4. A system for eliminating mud skin weakening effect at pile-wall joints according to claim 1, characterized in that: The distributed grouting module comprises a grouting pump (2) and a suspension device (4); the lifting and positioning device (1) is connected to the suspension device (4) via a steel cable; the suspension device (4) suspends the distributed grouting device (5) via the steel cable; the lifting and positioning device (1) outputs power to lift and lower the distributed grouting device (5) or to keep it at a fixed elevation.

5. A system for eliminating mud skin weakening effect at pile-wall joints according to claim 4, characterized in that: The suspension device (4) comprises a suspension wheel (41) and a suspension frame (42); the suspension frame (42) is mounted above the distributed grouting device (5); the suspension wheel (41) is fixed to the suspension frame (42) in accordance with the position and number of the distributed grouting device (5); and the suspension wheel (41) provides support for the steel cable.

6. A construction method for eliminating the weakening effect of mud skin at the joint of pile wall, characterized in that: The method of eliminating the weakening effect of mud skin at the joint of pile wall according to claim 3 is implemented by using the system, which comprises the following steps: S100, fixing the grouting module, arranging the grouting module on the side of the ground-connected wall steel cage, fixing the open grouting module along the steel cage extending into the end of the interlocking pile, i.e. the inner side, and fixing the closed grouting module along the position where the steel cage connects with the outer side of the interlocking pile, i.e. the outer side, the inner grouting pipe and the outer grouting pipe are arranged vertically, and fixing the expansion capsule on the outer grouting pipe; S200, lowering the steel cage into the groove, sealing the ends of the inner grouting pipe and the outer grouting pipe to prevent mud from entering the pipe when the steel cage is sunk, and lowering the steel cage into the ground-connected wall groove; S300, grouting inside the ground-connected wall. After the concrete pouring of the ground-connected wall is completed and reaches the age, the distributed grouting device is lowered into the inner grouting pipe, so that the grouting port corresponds to the grouting outlet of the required grouting depth. The designed grouting pressure is set on the grouting pump, and the open grouting module is used to grout the inside of the ground-connected wall, flush the mud skin, slag and impurities around the grouting outlet, and monitor the grouting volume; S400, grouting on the outside of the ground-connected wall. The distributed grouting device is lowered into the outside grouting pipe. After the grouting port corresponds to the grouting outlet of the required grouting depth, the outside closed grouting module is activated to inject grout into the expansion capsule, so that the expansion capsule expands to form a capsule enlarged head, forming a closed area to limit the flow range of the grout; S500, layered grouting of the ground-anchored wall. The water in the high-pressure rubber is pumped out through a water pipe to relieve the pressure. The grouting core tube is then lowered to the next grouting outlet position that requires grouting through the lifting and positioning device. The water pressure of the high-pressure rubber is restored through the water pipe to make it close to the inner grouting pipe or the outer grouting pipe to form a sealed space. The grouting core tube is then grouted until the designed grouting volume is reached. S300 and S400 are repeated until the grouting cycle of all elevations is completed to achieve the effect of layered grouting and reinforcement of the mud wall residue.

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