Shield tunnel prestress limited limiting grouting construction method and grouting equipment

Abstract

The invention discloses a shield tunnel prestress limited limiting grouting construction method and grouting equipment, belongs to the technical field of underground structure grouting, provides a construction method and special equipment for penetrating grouting in the process of tunneling a prestressed tunnel by a shield tunneling machine, and fills the technical blank in the field. The construction method comprises the following steps: according to the footage period of each ring of tunnel and the shortest intermittent time reserved for grouting operation when a material transporting train enters and exits from the tunnel, determining the grouting once every hour and the grouting quantity of ducts every time, and communicating the ducts with the determined quantity through an external rubber pipe to form a closed loop; a section which does not interfere with operation of a shield tunneling machine is selected as an access point of a closed loop according to the splicing progress of the duct pieces, grouting equipment is driven into the access point, one-time concentrated grouting of multiple hole channels is achieved, and then the grouting equipment is driven out of a tunnel along with a material conveying list. The problem that grouting operation is dynamically completed within a limited window period in the tunnel tunneling process of the shield tunneling machine is solved, the mechanization degree is high, arrangement is flexible, and the construction efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting, and more particularly to a shield tunnel prestressed time-limited and position-limited grouting construction method and grouting equipment. Background Art

[0002] In recent years, prestressed concrete systems, known for their superior reinforcement properties, have been gradually developed and applied to specialized engineering structures such as tunnels. Prestressed shield tunnel structures, in particular, are a pioneering technology in the industry. Circumferential prestressing is often used in tunnel projects to enhance the integrity and bearing capacity of the lining structure, while also reducing cracks and ensuring the durability of the tunnel structure. Prestressed concrete segment construction primarily involves three steps: threading the prestressed concrete through the ducts, tensioning the prestressed tendons, and grouting the ducts. Grouting, a key measure for protecting the prestressed concrete system, is crucial for ensuring structural durability.

[0003] The existing shield tunnel construction method does not take into account the operating procedures of the prestressed system, and the existing shield machines are not equipped with prestressed channel grouting facilities. Due to the small space in the tunnel, the compact process and the cross-reciprocating operation of mechanical equipment during the shield machine excavation process, the conventional grouting method is mostly fixed-point grouting. Its grouting equipment such as grouting pumps and mixing barrels are difficult to arrange and move, have long pipelines, are difficult to clean, and have low efficiency, which cannot meet the operating conditions of prestressed shield tunnels. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. One purpose of the present invention is to provide a method for construction of prestressed time-limited and position-limited grouting in a shield tunnel.

[0005] The second purpose of the present invention is to provide a shield tunnel prestressed time-limited and position-limited grouting equipment.

[0006] In order to achieve the above-mentioned first object, the present invention provides a shield tunnel prestressed time-limited and position-limited grouting construction method, which is characterized by comprising the following steps:

[0007] Step 1. Determine the grouting interval and grouting cycle for each grouting session based on the duration and rest time of tunnel excavation. Utilize the idle time to cut the exposed length of the prestressed tendons of the prestressed segments within the grouting interval to the process requirements. Install anchor caps, joint pipes, and valves at the grouting outlets and inlets of the prestressed segments.

[0008] Then, use an external hose to connect the slurry outlet and slurry inlet of each ring of prestressed pipe segments in the grouting area in series. According to the principle of connecting the interfaces on the same side in series first and then the interfaces on the opposite side in series, a closed loop can be formed, so that the slurry inlet of the first channel to the slurry outlet of the last channel are all at the same operation point.

[0009] Install a valve at the exhaust port of the last channel and connect it to the slurry storage cylinder through the slurry discharge pipe. Install valves and slurry caps at the exhaust ports of other channels.

[0010] Step 2. Transport the material bag and grouting equipment to the operation point according to the theoretical amount of material powder required for grouting operation in the grouting area;

[0011] Step 3. Prepare slurry by grouting equipment;

[0012] Step 4. The grouting equipment is connected to the slurry inlet of the first channel through the grouting pipe, and the slurry outlet of the last channel is connected to the slurry storage cylinder using the slurry return hose;

[0013] Step 5. Open all valves and start grouting through the grouting equipment. Wait for slurry to be discharged from the exhaust port of each channel and then close the exhaust port valve. After slurry is discharged from the exhaust port of the last channel, close the slurry inlet valve of the first channel.

[0014] Connect the grouting pipe to the slurry outlet of the last channel to fill the slurry, and then after the slurry is discharged from the exhaust port of the last channel again, close the exhaust port valve to maintain pressure for a specified time;

[0015] Step 6. Close the valve of the grout outlet of the last channel, remove the grouting pipe, and close all valves of the intermediate channels to complete the grouting of the channels in the grouting interval;

[0016] Step 7. Clean the grouting equipment promptly, drain the waste liquid into the grouting tank, drive the grouting equipment out of the tunnel along with the material transport train, and pour the waste liquid in the grouting tank into the designated treatment location;

[0017] Step 8. When the slurry reaches the initial setting time, use the free time to remove the joint pipes, valves, and external hoses, and clean the slurry in the joint pipes, valves, and external hoses so that they can be used again.

[0018] In order to achieve the above-mentioned second purpose, the present invention provides a shield tunnel prestressed time-limited and position-limited grouting equipment, including a mobile platform, the bottom of the mobile platform is provided with wheels, the top of the mobile platform is provided with a control module, a high-speed stirring device, a low-speed stirring device, a feeding device for feeding the high-speed stirring device, and a loading arm for feeding the feeding device, the high-speed stirring device is located above the low-speed stirring device, the high-speed stirring device is provided with a weight sensor, the bottom of the high-speed stirring device is provided with a slurry discharge port for discharging slurry to the low-speed stirring device, the slurry discharge port is provided with a slurry discharge control valve, the bottom of the low-speed stirring device is provided with a discharge port, the discharge port is connected to a grouting pump, the output end of the grouting pump is provided with a pressure gauge and a grouting interface, the control module is electrically connected to the high-speed stirring device, the low-speed stirring device, the feeding device, the loading arm, the slurry discharge control valve, the grouting pump, the pressure gauge, and the weight sensor.

[0019] As a further improvement, the high-speed stirring device includes a high-speed stirring drum, the slurry discharge port is located at the bottom of the high-speed stirring drum, the weight sensor is arranged at the bottom of the high-speed stirring drum, a high-speed stirring impeller is provided in the high-speed stirring drum, a high-speed motor connected to the high-speed stirring impeller is provided at the top of the high-speed stirring drum, and the control module is electrically connected to the high-speed motor.

[0020] Furthermore, the low-speed stirring device includes a low-speed stirring drum, the discharge port is located at the bottom of the low-speed stirring drum, a low-speed stirring impeller is provided in the low-speed stirring drum, a low-speed motor connected to the low-speed stirring impeller is provided at the top of the low-speed stirring drum, and the control module is electrically connected to the low-speed motor.

[0021] Furthermore, the feeding device includes a hopper, the bottom of the hopper is provided with a feeding channel extending to the top of the high-speed stirring device, the feeding channel is provided with an auger blade, the top of the feeding channel is provided with a feeding motor for driving the auger blade to rotate, the upper end of the feeding channel is provided with a feeding port for feeding the high-speed stirring device, and the control module is electrically connected to the feeding motor.

[0022] Furthermore, the loading arm includes a column installed on the top of the mobile platform, a crossbeam is provided on the top of the column, the crossbeam is located above the loading device, the crossbeam is provided with a mobile trolley, the mobile trolley is provided with a crane, the lower end of the lifting rope of the crane is connected to a gripper for grabbing the material bag, and the control module is electrically connected to the mobile trolley and the crane.

[0023] Furthermore, a rotating platform connected to the beam is provided on the top of the column, and the control module is electrically connected to the rotating platform.

[0024] Furthermore, a rotating platform connected to the column is provided on the top of the mobile platform, and the control module is electrically connected to the rotating platform.

[0025] Furthermore, the movable platform on one side of the column is provided with a storage area for storing material bags.

[0026] Furthermore, a slurry storage barrel for accommodating waste slurry is provided on the top of the mobile platform.

[0027] Beneficial effects

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The grouting construction method proposed in the present invention is composed of a series system consisting of the longitudinal and transverse connections of the channels and the positions of the grouting equipment. By connecting and arranging different numbers of channels in series, it can adapt to the operating conditions of shield machines in different areas and types, and realize dynamic and flexible grouting under multiple constraints in the tunnel.

[0030] 2. The grouting equipment designed in this invention utilizes mechanized, intelligent, and integrated technologies to achieve a multifunctional integrated solution for transportation, mixing, grouting, and recycling, resulting in high operational efficiency and convenient construction. It also solves the problem of rapid movement of the grouting equipment within the tunnel, and can carry materials, autonomously lift, and transport waste.

[0031] 3. The present invention designs a series of dynamic serial grouting implementation steps based on the characteristics of periodic tunneling operations, which fully utilizes the interval time between processes, is flexible and maneuverable, and is conducive to the overall optimization of man-machine-material configuration, thereby reducing construction costs.

[0032] 4. The dynamic serial grouting technology proposed in the present invention fully conforms to the layout characteristics of the prestressed system of the tunnel structure, and can complete multi-channel grouting in one go, without the need for repeated installation and disassembly of grouting pipelines and mobile grouting equipment, greatly improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the material transport train connected to the grouting equipment in the present invention;

[0034] Figure 2 This is a schematic diagram of the main structure of the grouting equipment of the present invention;

[0035] Figure 3 It is a schematic diagram of the top view of the grouting equipment in the present invention;

[0036] Figure 4 Schematic diagram of grouting using grouting equipment in the present invention;

[0037] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0038] Figure 6 This is a schematic diagram of grouting using grouting equipment in the present invention.

[0039] Among them: 1-mobile platform, 2-wheel, 3-control module, 4-high-speed stirring device, 5-low-speed stirring device, 6-feeding device, 7-loading arm, 8-weight sensor, 9-slurry discharge port, 10-slurry discharge control valve, 11-discharge port, 12-grouting pump, 13-pressure gauge, 14-grouting interface, 15-high-speed stirring drum, 16-high-speed motor, 17-low-speed stirring drum, 18-low-speed motor, 19-hopper, 20-feeding channel, 21-feeding motor, 22-feeding port, 23-column, 24-beam, 25-mobile trolley, 26-crane, 27-lifting rope, 28-grab, 29-rotating table, 30-material storage area, 31-slurry storage barrel, 32-grouting section, 33-prestressed pipe segment, 34-prestressed beam, 35-channel, 36-anchor cover, 37-connecting pipe, 38-valve, 39-external hose, 40-exhaust port, 41-slurry discharge pipe, 42-slurry cap, 43-grouting pipe, 44-return slurry hose, 45-material transport train, 46-anchor plate, 47-working anchor plate, 48-working clip, 49-grouting equipment. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0041] According to the characteristics of the shield tunnel segment structure, the prestressing force is arranged in a vertical ring and cross-anchored to the inner wall of the prestressing segment 33. In order to ensure the uniformity of the structural force, the prestressing force amount and anchoring position of each ring of the prestressing segment 33 should be arranged symmetrically, such as Figure 4 As shown, each ring of prestressed segments 33 is equipped with two prestressed strands 34, with the anchorage positions of the two strands 34 arranged symmetrically. Depending on the operational and maintenance requirements of the tunnel structure, cable force monitoring sensors and spare channels can be reserved on the prestressed segments 33. This allows for constant monitoring of the stress state of the prestressed segments 33 during operation, and allows for re-application or replacement of prestressing forces after a certain period of service.

[0042] The anchoring of the prestressed tendon 34 is as follows Figure 5 As shown, during the prefabrication process of the prestressed pipe segment 33 , the anchor plate 46 is pre-buried in the prestressed pipe segment 33 . After the prestressed bundle 34 is passed through the channel 35 , it is tensioned to the design force value and then anchored by the working anchor plate 47 and the working clip 48 .

[0043] See Figures 1 to 6In this embodiment, a shield tunnel prestressed time-limited and position-limited grouting equipment is provided, including a mobile platform 1, and wheels 2 are provided at the bottom of the mobile platform 1. A control module 3, a high-speed stirring device 4, a low-speed stirring device 5, a feeding device 6 for feeding the high-speed stirring device 4, and a loading arm 7 for feeding the feeding device 6 are provided at the top of the mobile platform 1. The high-speed stirring device 4 is located above the low-speed stirring device 5, and the high-speed stirring device 4 is provided with a weight sensor 8. A slurry discharge port 9 for discharging slurry to the low-speed stirring device 5 is provided at the bottom of the high-speed stirring device 4, and the slurry discharge port 9 is provided with a slurry discharge control valve 10. A discharge port 11 is provided at the bottom of the low-speed stirring device 5, and the discharge port 11 is connected to a grouting pump 12. The output end of the grouting pump 12 is provided with a pressure gauge 13 and a grouting interface 14. The control module 3 is electrically connected to the high-speed stirring device 4, the low-speed stirring device 5, the feeding device 6, the loading arm 7, the slurry discharge control valve 10, the grouting pump 12, the pressure gauge 13, and the weight sensor 8.

[0044] The wheel 2 is a rail train wheel structure and can be connected in series with the material transport train 45 during shield machine operation as a power source. Of course, it can also be driven independently by its own power, that is, the motor is controlled by the control module 3 to drive the wheel 2 to rotate.

[0045] Specifically, the high-speed stirring device 4 includes a high-speed stirring drum 15, a slurry discharge port 9 is located at the bottom of the high-speed stirring drum 15, a weight sensor 8 is provided at the bottom of the high-speed stirring drum 15, the high-speed stirring drum 15 is installed on the top of the mobile platform 1 through a bracket (the bracket is not shown), the weight sensor 8 is on the top of the bracket and supports the high-speed stirring drum 15, a high-speed stirring impeller is provided in the high-speed stirring drum 15, a high-speed motor 16 connected to the high-speed stirring impeller is provided at the top of the high-speed stirring drum 15, and the control module 3 is electrically connected to the high-speed motor 16. The high-speed stirring drum 15 is provided with a water inlet for injecting water into the high-speed stirring drum 15 through an external water pipe, the water inlet is provided with a water valve, and the control module 3 is electrically connected to the water valve. The high-speed stirring device 4 is used to stir the powder and water into a slurry, the high-speed motor provides power, the weight sensor is used to control the water inlet and feed amount in the high-speed stirring drum, and the slurry discharge port is used to discharge the stirred slurry into the low-speed stirring drum.

[0046] The low-speed stirring device 5 includes a low-speed stirring drum 17, with a discharge port 11 located at the bottom of the low-speed stirring drum 17. A low-speed stirring impeller is installed in the low-speed stirring drum 17, and a low-speed motor 18 connected to the low-speed stirring impeller is installed at the top of the low-speed stirring drum 17. The control module 3 is electrically connected to the low-speed motor 18. The low-speed stirring device 5 is used to prevent slurry sedimentation, and the low-speed motor provides power; the discharge port 11 is used to transport the slurry into the grouting pump.

[0047] The grouting pump 12 is used to extract slurry, the pressure gauge 13 is used to measure and feedback the slurry pressure, and the grouting interface 14 is used to connect to the slurry inlet of the channel 35 of the prestressed pipe segment 33 through the grouting pipe 43.

[0048] The feeding device 6 includes a hopper 19. The hopper 19 is a box-shaped structure for accommodating powder. A cover plate can be provided on the hopper 19 to prevent powder from flying during operation. A feeding channel 20 is provided at the bottom of the hopper 19, extending to the top of the high-speed stirring device 4. The feeding channel 20 is a pipeline structure for conveying powder from the hopper 19 to the high-speed stirring drum. An auger blade is provided in the feeding channel 20. A feeding motor 21 is provided at the top of the feeding channel 20 to drive the auger blade to rotate. The feeding motor 21 provides power for conveying powder. A feeding port 22 is provided at the upper end of the feeding channel 20 for feeding material to the high-speed stirring device 4. The control module 3 is electrically connected to the feeding motor 21.

[0049] The loading arm 7 includes a column 23 mounted on the top of the mobile platform 1. A crossbeam 24 is provided on the top of the column 23. The crossbeam 24 is located above the loading device 6. A mobile trolley 25 (similar to a crane or overhead crane) is provided on the crossbeam 24. The mobile trolley 25 is provided with a crane 26. The lower end of the suspension rope 27 of the crane 26 is connected to a gripper 28 (manipulator) for grabbing the material bag. The control module 3 is electrically connected to the mobile trolley 25 and the crane 26. The gripper 28 is opened and closed manually or controlled by the control module 3.

[0050] In one embodiment, a rotating platform 29 connected to the crossbeam 24 is provided on the top of the column 23. Figure 2 As shown, the control module 3 is electrically connected to the rotating platform 29 so that the beam 24 can achieve horizontal rotation.

[0051] In one embodiment, a rotating platform 29 connected to the pillar 23 is provided on the top of the mobile platform 1 , and the control module 3 is electrically connected to the rotating platform 29 .

[0052] The mobile platform 1 on one side of the column 23 is provided with a storage area 30 for storing material bags. The top of the mobile platform 1 is also provided with a slurry storage barrel 31 for accommodating discarded slurry.

[0053] A shield tunnel prestressed time-limited position-limited grouting construction method is mainly applicable to anchoring prestressed bundles 34 using a bonding prestressing system, comprising the following steps:

[0054] Step 1. Determine each grouting interval 32 and grouting cycle based on the cycle length and intermittent time during tunnel excavation. Utilize idle time (i.e., when no other operations are performed after the prestressed tendons 34 in the grouting interval 32 are tensioned) to cut the exposed length of the prestressed tendons 34 of the prestressed segments 33 in the grouting interval 32 to the process requirements. Install anchor covers 36, joint pipes 37, and valves 38 at the slurry outlets and slurry inlets of the ducts 35 of the prestressed segments 33. The valves 38 are installed in the joint pipes 37. The anchor covers 36 cover the exposed prestressed tendons 34 and anchors to protect them.

[0055] Then, use the external hose 39 to connect the slurry outlet and slurry inlet of the duct 35 of each ring prestressed pipe segment 33 in the grouting interval 32 in series, first connect the interfaces on the same side in series, such as Figure 4 The principle of connecting the external hoses 39 of No. 1, No. 2 and No. 3 in series with the opposite side interfaces is as follows: Figure 4 The external hoses 39 of No. 4, No. 5, and No. 6 can form a closed loop, so that the slurry inlet of the first channel 35 and the slurry outlet of the last channel 35 are all at the same operating point, that is, the operating point is at the position of the first ring of prestressed segments 33;

[0056] The exhaust port 40 of the last channel 35 is installed with a valve 38 and connected to the slurry storage cylinder 31 through a slurry discharge pipe 41. Valves 38 and slurry caps 42 are installed at the exhaust ports 40 of other channels 35; the slurry caps 42 are used to receive the slurry discharged from the exhaust port 40;

[0057] Step 2. According to the theoretical amount of powder required for grouting operation in grouting interval 32, transport the material bag and grouting equipment 49 to the operation point; the grouting equipment 49 can adopt the existing mature automatic grouting equipment products, or can adopt the one in this embodiment. Figure 1-Figure 3 A shield tunnel prestressed time-limited position-limited grouting equipment is shown;

[0058] When the grouting equipment 49 adopts a shield tunnel prestressed time-limited and position-limited grouting equipment in this embodiment, the material package is loaded on the mobile platform 1 according to the theoretical amount of material powder required for the grouting operation in the grouting section 32, and transported to the operation point by the mobile platform 1 (via the material transport train 45 entering the tunnel);

[0059] Step 3. Prepare slurry by slurrying equipment 49;

[0060] When the grouting equipment 49 adopts a shield tunnel prestressed time-limited position-limited grouting equipment in this embodiment, the slurry production process is as follows: connect the water and electricity lines of the mobile platform 1, use the loading arm 7 to grab the material bag, and then put the material into the loading device 6;

[0061] Input the slurry dosage, water-cement ratio, pressure, and stirring time parameters into the control module 3, and then start. The control module 3 controls the feeding device 6 to feed the high-speed stirring device 4 according to the slurry dosage and water-cement ratio, and stops feeding after the weight sensor 8 detects that enough water has been added. The control module 3 controls the water valve of the high-speed stirring device 4 to open and add water, and stops adding water after the weight sensor 8 detects that enough water has been added;

[0062] The control module 3 controls the high-speed stirring device 4 to perform high-speed stirring according to the stirring time. After the high-speed stirring is completed, the control module 3 controls the slurry discharge control valve 10 to open and put the stirred slurry into the low-speed stirring device 5. The control module 3 controls the low-speed stirring device 5 to continue stirring at a low speed to prevent the slurry from settling.

[0063] Start the grouting pump 12 to discharge the air and impurities in the grouting pipe 43, and discharge the waste liquid into the slurry storage barrel 31;

[0064] Step 4. Connect the grouting interface 14 to the grouting pipe 43, connect the grouting pipe 43 to the slurry inlet (the joint pipe 37 of the slurry inlet) of the first channel 35, and connect the slurry outlet (the joint pipe 37 of the slurry outlet) of the last channel 35 to the slurry storage cylinder 31 using the slurry return hose 44;

[0065] Step 5. Open all valves 38, start grouting through the grouting equipment 49 (i.e., the control module 3 controls the grouting pump 12 to start grouting), and wait for the exhaust port 40 of each channel 35 to discharge slurry, and then close the valve 38 of the exhaust port 40 of the channel 35. After the exhaust port 40 of the last channel 35 discharges slurry, the valve 38 of the exhaust port 40 of the last channel 35 is not closed, and then close the valve 38 of the slurry inlet of the first channel 35;

[0066] Connect the grouting pipe 43 to the slurry outlet of the last channel 35 to fill the slurry, and then after the slurry is discharged from the exhaust port 40 of the last channel 35 again, close the valve 38 of the exhaust port 40 of the last channel 35 to maintain pressure for a specified time;

[0067] Step 6. Close the valve 38 of the slurry outlet of the last channel 35, remove the grouting pipe 43, and close all valves 38 of the intermediate channels 35, thus completing the grouting of the channels 35 in the grouting interval 32;

[0068] Step 7. Use clean water to clean the grouting equipment in a timely manner. That is, clean water enters the high-speed stirring device 4, cleans the high-speed stirring device 4, the low-speed stirring device 5, and the grouting pump 12 in sequence, and passes the waste liquid into the slurry storage barrel 31. The grouting equipment is driven out of the tunnel along with the material transport train 45, and the waste liquid in the slurry storage barrel 31 is poured into a designated treatment location;

[0069] Step 8. When the slurry reaches the initial setting time, use the idle time to remove the joint pipe 37, valve 38, and external hose 39, and clean the slurry in the joint pipe 37, valve 38, and external hose 39 so that they can be used again.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A shield tunnel prestressed time-limited position-limited grouting construction method, characterized in that: The following steps are involved: Step 1. Determine the grouting interval (32) and grouting cycle for each time according to the cycle length and the intermittent time during the tunnel excavation process, use the idle time to cut the exposed length of the prestressed bundle (34) of the prestressed pipe segment (33) in the grouting interval (32) to the process requirement, and install the anchor cover (36), the joint pipe (37) and the valve (38) at the slurry outlet and slurry inlet of the duct (35) of the prestressed pipe segment (33); Then, the slurry outlets and slurry inlets of the ducts (35) of each ring of prestressed pipe segments (33) in the grouting interval (32) are connected in series by using an external rubber hose (39). According to the principle of first connecting the interfaces on the same side in series and then connecting the interfaces on the opposite side in series, a closed loop can be formed, so that the slurry inlet of the first duct (35) to the slurry outlet of the last duct (35) are all at the same operation point. The exhaust port (40) of the last channel (35) is equipped with a valve (38) and is connected to the slurry storage barrel (31) through a slurry discharge pipe (41). Valves (38) and slurry caps (42) are installed at the exhaust ports (40) of other channels (35); Step 2. transporting the material bag and grouting equipment (49) to the operation point according to the theoretical amount of material powder required for the grouting operation in the grouting area (32); Step 3. Making slurry by slurry pressing equipment (49); Step 4. The grouting equipment (49) is connected to the slurry inlet of the first channel (35) through the grouting pipe (43), and the slurry outlet of the last channel (35) is connected to the slurry storage cylinder (31) using the slurry return hose (44); Step 5. Open all valves (38), start grouting through the grouting equipment (49), wait for the slurry to be discharged from the exhaust port (40) of each channel (35), and then close the valve (38) of the exhaust port (40) until the slurry is discharged from the exhaust port (40) of the last channel (35), and then close the valve (38) of the slurry inlet of the first channel (35); Connect the grouting pipe (43) to the slurry outlet of the last channel (35) to fill the slurry, and then after the slurry is discharged from the exhaust port (40) of the last channel (35) again, close the valve (38) of the exhaust port (40) to maintain pressure for a specified time; Step 6. Close the valve (38) of the slurry outlet of the last channel (35), remove the grouting pipe (43), and close all valves (38) of the middle channel (35), thus completing the grouting of the channel (35) in the grouting interval (32); Step 7. Clean the grouting equipment in time, pass the waste liquid into the grouting barrel (31), drive the grouting equipment (49) out of the tunnel along with the material transport train (45), and pour the waste liquid in the grouting barrel (31) into the designated treatment location; Step 8. When the slurry reaches the initial setting time, use the idle time to remove the joint pipe (37), valve (38), and external hose (39), and clear the slurry in the joint pipe (37), valve (38), and external hose (39) for reuse.

2. A shield tunnel prestressed time-limited position-limited grouting device, comprising a mobile platform (1), wherein wheels (2) are provided at the bottom of the mobile platform (1), characterized in that: The top of the mobile platform (1) is provided with a control module (3), a high-speed stirring device (4), a low-speed stirring device (5), a feeding device (6) for feeding the high-speed stirring device (4), and a feeding arm (7) for feeding the feeding device (6). The high-speed stirring device (4) is located above the low-speed stirring device (5). The high-speed stirring device (4) is provided with a weight sensor (8). The bottom of the high-speed stirring device (4) is provided with a slurry discharge port (9) for discharging slurry to the low-speed stirring device (5). The outlet (9) is provided with a slurry discharge control valve (10); the bottom of the low-speed stirring device (5) is provided with a discharge port (11); the discharge port (11) is connected to a grouting pump (12); the output end of the grouting pump (12) is provided with a pressure gauge (13) and a grouting interface (14); the control module (3) is electrically connected to the high-speed stirring device (4), the low-speed stirring device (5), the feeding device (6), the loading arm (7), the slurry discharge control valve (10), the grouting pump (12), the pressure gauge (13), and the weight sensor (8).

3. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 2, characterized in that: The high-speed stirring device (4) includes a high-speed stirring drum (15), the slurry discharge port (9) is located at the bottom of the high-speed stirring drum (15), the weight sensor (8) is arranged at the bottom of the high-speed stirring drum (15), a high-speed stirring impeller is arranged in the high-speed stirring drum (15), a high-speed motor (16) connected to the high-speed stirring impeller is arranged at the top of the high-speed stirring drum (15), and the control module (3) is electrically connected to the high-speed motor (16).

4. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 2, characterized in that: The low-speed stirring device (5) includes a low-speed stirring drum (17), the discharge port (11) is located at the bottom of the low-speed stirring drum (17), a low-speed stirring impeller is provided in the low-speed stirring drum (17), a low-speed motor (18) connected to the low-speed stirring impeller is provided at the top of the low-speed stirring drum (17), and the control module (3) is electrically connected to the low-speed motor (18).

5. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 2, characterized in that: The feeding device (6) includes a hopper (19), the bottom of the hopper (19) is provided with a feeding channel (20) extending to the top of the high-speed stirring device (4), the feeding channel (20) is provided with an auger blade, the top of the feeding channel (20) is provided with a feeding motor (21) for driving the auger blade to rotate, the upper end of the feeding channel (20) is provided with a feeding port (22) for feeding material to the high-speed stirring device (4), and the control module (3) is electrically connected to the feeding motor (21).

6. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 2, characterized in that: The loading arm (7) includes a column (23) installed on the top of the mobile platform (1), a crossbeam (24) is provided on the top of the column (23), the crossbeam (24) is located above the loading device (6), the crossbeam (24) is provided with a mobile trolley (25), the mobile trolley (25) is provided with a crane (26), the lower end of the lifting rope (27) of the crane (26) is connected to a gripper (28) for grabbing a material bag, and the control module (3) is electrically connected to the mobile trolley (25) and the crane (26).

7. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 6, characterized in that: A rotating platform (29) connected to the crossbeam (24) is provided on the top of the column (23), and the control module (3) is electrically connected to the rotating platform (29).

8. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 6, characterized in that: A rotating platform (29) connected to the column (23) is provided on the top of the mobile platform (1), and the control module (3) is electrically connected to the rotating platform (29).

9. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 2, characterized in that: The movable platform (1) on one side of the upright column (23) is provided with a material storage area (30) for storing material bags.

10. The shield tunnel prestressed time-limited position-limited grouting equipment according to claim 2, characterized in that: The top of the mobile platform (1) is also provided with a slurry storage barrel (31) for accommodating waste slurry.

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