Shield tunnel backfill grouting device and using method

Abstract

The invention discloses a shield tunnel wall back grouting device and a using method, and belongs to the technical field of shield construction, the shield tunnel wall back grouting device comprises a flat car, a mortar tank car and a battery car track, the flat car is provided with a feeding spiral assembly and an additive dosing machine, and the front end of the mortar tank car is provided with a mortar conveying pump assembly; the mortar tank car is connected with the flat car through the connecting plate, and the flat car and the mortar tank car are driven by the storage battery traction locomotive to move on the storage battery car track. Additives and mortar are mixed through the additive batching machine and then pumped to the back of the duct piece through the mortar conveying pump, stratum gaps caused by insufficient shield tunnel synchronous grouting are filled, and the shield tunnel wall back grouting effect is effectively improved. Meanwhile, mortar added with an additive is fully mixed in the feeding screw conveyor, mechanical automation is achieved in the whole process, manpower is effectively saved, and the mixing effect of the mortar and the additive is improved.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, and in particular to a shield tunnel wall back grouting device and a use method thereof. Background Art

[0002] The shield machine is a special engineering machine used for tunnel construction, which is often used in subway construction. Generally, when the shield machine is excavating underground, in order to avoid the surface settlement caused by the building gap formed by the excavation diameter of the shield cutter head and the outer periphery of the pipe segment, which affects the surrounding buildings, the shield machine is equipped with a synchronous grouting system. The grouting system can inject cement slurry into the building gap synchronously during the shield construction process. When the cement slurry solidifies, it can form an effective support for the stratum. After solidification, the mortar will shrink in volume to a certain extent, and secondary grouting is required to fill the deficiency of synchronous grouting. In strata rich in groundwater, the flow of groundwater will take away part of the slurry. At the same time, the groundwater makes the slurry thinner, changes the slurry ratio and initial setting time, and has a great impact on the grouting quality. The conventional treatment method is to grout multiple times to improve the filling effect of the stratum gap. Affected by factors such as slurry quality and initial setting time, grouting method, and technical level of grouting personnel, the grouting quality still has defects. Summary of the invention

[0003] In order to fill the formation voids caused by insufficient synchronous grouting as soon as possible and avoid the problem that the cement slurry + water glass double liquid slurry injected twice in the water-rich formation is easily washed away by groundwater, the present invention proposes a shield tunnel wall back grouting device and a use method. The grouting device of the present invention adopts a combination method, and a mortar tank truck, a feeding screw machine, an additive batching machine, a mortar delivery pump, a grouting hose, and a grouting valve assembly are combined to form a grouting device, and cement mortar and additives with a short initial setting time are used as grouting raw materials. The cement mortar and the additives are mixed and stirred by the feeding screw machine and conveyed to the mortar delivery pump feed hopper. The mortar is pumped by the mortar delivery pump and pumped to the formation voids around the pipe segment through the grouting hose and the grouting valve assembly, so as to fill the formation voids formed by insufficient synchronous grouting or slurry solidification and shrinkage as soon as possible.

[0004] To achieve the above-mentioned purpose, the present invention provides a shield tunnel wall back grouting device, which is arranged in the shield tunnel. The grouting device includes a flatbed truck, a mortar tank truck and an electric car track. The mortar tank truck is connected to the flatbed truck through a connecting plate. The flatbed truck is provided with a mortar delivery pump, a feeding screw assembly and an additive batching machine. The front end of the mortar tank truck is provided with a mortar pump assembly. The flatbed truck, the mortar tank truck and the electric car track are rollingly connected.

[0005] Preferably, the flatbed truck is provided with a base and a grouting valve assembly, the mortar delivery pump, the feeding screw assembly, and the additive batching machine are fixedly installed on the base, the discharge port of the mortar delivery pump is connected to the grouting valve assembly through a grouting hose, and the feed port of the mortar delivery pump is provided with a feed hopper, and the feed hopper is arranged below the outlet end of the feeding screw assembly.

[0006] Preferably, positioning angle steels are provided at the four corners of the flatbed cart, one end of the four sections of the positioning angle steels are welded to the flatbed cart, and the other end is not less than 50 mm higher than the table top of the flatbed cart, the base is placed in the rectangular space formed by the four sections of the positioning angle steels, and four rollers are symmetrically provided at the bottom of the flatbed cart.

[0007] Preferably, the size of the positioning angle steel is: 100×100×6, and the length is not less than 150 mm.

[0008] Preferably, the feeding screw assembly includes a feeding screw bracket, a feeding screw machine and a screw machine hopper, the screw machine hopper is arranged at the lower part of the feeding screw machine, and the feeding screw bracket is connected to the feeding screw machine and the base by fixing bolts.

[0009] Preferably, the feeding spiral bracket adopts a steel structure, and the feeding spiral bracket includes a bottom support, leg one, leg two and a fixed sleeve one. The lower parts of leg one and leg two are welded to the bottom support, and the tops of leg one and leg two are welded to the fixed sleeve one. The diameter of the fixed sleeve one matches the outer diameter of the feeding spiral machine. The fixed sleeve one adopts two semicircular barrel structures, and the length of the fixed sleeve one is not less than 300 mm.

[0010] Preferably, the additive batching machine includes a weighing screw machine, an additive storage hopper and a support assembly, the support assembly is connected to the base by fixing bolts, the additive batching machine is fixedly mounted on the support assembly, the weighing screw machine is provided with a transmission mechanism, the weighing screw machine is connected to the bottom of the additive storage hopper through the transmission mechanism, and the outlet of the weighing screw machine is arranged at the upper end of the screw machine hopper.

[0011] Preferably, the mortar pump assembly includes a feed pipe part, a mortar pump and a discharge pipe part, and connecting flanges are respectively provided at both ends of the mortar pump, and the feed pipe part and the discharge pipe part are connected to the mortar pump through the connecting flanges, one end of the feed pipe part is installed on the bottom of the mortar tank truck, and the discharge pipe part is fixed to the base through a feed pipe bracket, and a fixing sleeve 2 is provided on the feed pipe bracket, and the discharge pipe part is fixedly connected to the fixing sleeve 2 through fixing bolts, and the diameter of the fixing sleeve 2 matches the diameter of the discharge pipe part, and the outlet end of the discharge pipe part is arranged at the upper end of the screw machine hopper.

[0012] Preferably, the mortar tank truck is driven by a battery locomotive to move in the shield tunnel, and a second roller is provided at the bottom of the mortar tank truck, and the second roller is rollingly connected to the battery truck track.

[0013] Preferably, a method for using a shield tunnel wall back grouting device comprises the following steps: S1: Fix and install the grouting device; first, install the feeding screw assembly and the additive batching machine on the base, wherein the size of the base is determined according to the size of the flatbed truck. During the installation, ensure that the outlet of the additive batching machine is fixed above the screw machine hopper in the feeding screw assembly. Then, hoist the base and the mortar delivery pump, feed hopper, feeding screw assembly and additive batching machine installed on the base onto the flatbed truck. The base is fixed by positioning angle steels welded to the four corners of the flatbed truck. Finally, connect the mortar pump outlet in the existing mortar tank truck with the feed port of the mortar pump assembly, and the outlet of the mortar pump assembly is fixed to the base of the flatbed truck through a feeding pipe bracket. The feeding pipe bracket is made according to the on-site space. At the same time, the mortar delivery pump, feeding screw assembly, additive batching machine, mortar tank truck and the matching mortar pump are powered by a 400V power supply in the tunnel; S2: Grouting operation of the grouting device: After the grouting device is installed in place, the equipment system is debugged first. After the debugging is qualified, the entire grouting device is driven by a battery locomotive and moves on the battery car track installed in the tunnel. First, mortar that meets the initial setting requirements is injected into the mortar tank car. When the battery car stops at the pre-grouting position in the tunnel, it is securely fixed. Then, the two ends of the grouting hose are respectively connected to the mortar delivery pump and the grouting valve assembly to ensure that the outlet of the grouting valve assembly is reliably and fixedly connected to the pre-grouting port. The mortar pump on the mortar tank car is started to deliver mortar to the screw machine hopper of the upper screw assembly. At the same time, the additive batching machine is started, and the additive batching machine synchronously conveys the additive to the screw machine hopper. At this time, the mortar and the additive are preliminarily mixed and conveyed by the feeding screw machine to the feed hopper at the feed port of the mortar delivery pump. After the mortar and the additive are fully mixed in the feeding screw machine, the mortar is pumped to the back gap of the shield tunnel through the grouting hose and the grouting valve assembly by the mortar delivery pump to fill the stratum gaps caused by insufficient synchronous grouting or slurry solidification and shrinkage as soon as possible. When the grouting pressure reaches the design requirement, the grouting is stopped, the grouting hose is removed, and the grouting hose is moved to the next grouting point to continue grouting.

[0014] Therefore, compared with the prior art, the present invention has the following beneficial effects: (1) The present invention pumps mortar with additives to the back of the pipe segment through a mortar delivery pump to fill the stratum voids that are not penetrated by the synchronous grouting. The cement mortar + additive mortar with a short initial setting time properly solves the building voids after the synchronous grouting solidifies during the shield excavation process, reduces the stratum settlement caused by the mortar solidification shrinkage and other problems; solves the problem that the secondary double-liquid grouting in the water-rich stratum is easily washed away by groundwater; and fills the stratum voids in time, which plays a good role in effectively controlling the stratum settlement and deformation of underground pipelines.

[0015] (2) The additive batching machine in the grouting device provided by the present invention feeds the additive into the hopper of the screw machine and preliminarily mixes it with the mortar pumped by the mortar pump matched with the mortar tank truck. Finally, it is pumped to the back of the pipe segment through the feeding screw machine, the mortar delivery pump and the grouting hose. The mortar with the additive added is fully mixed in the feeding screw machine. The whole process realizes mechanical automation, effectively saves manpower, and improves the efficiency of mixing mortar with additives.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A magnified image of point A; Figure 3 for Figure 2A side view structural schematic diagram of; Figure 4 It is a schematic diagram of the structure of the feeding spiral assembly; Figure 5 It is a schematic diagram of the structure of the additive batching machine; Figure 6 It is a schematic diagram of the structure of the discharge pipe.

[0018] Reference numerals: 1. Flatbed car; 11. Base; 12. Mortar delivery pump; 13. Feed hopper; 14. Grouting hose; 15. Grouting valve assembly; 16. Roller 1; 17. Positioning angle steel; 2. Feeding screw assembly; 21. Feeding screw machine; 22. Feeding screw bracket; 2201. Leg 1; 2202. Bottom support; 2203. Leg 2; 2204. Fixed sleeve 1; 23. Screw machine hopper; 24. Fixed bolts; 3. Additive batching machine; 31. Weighing screw machine; 32. Support assembly; 33. Transmission mechanism; 34. Additive storage hopper; 4. Mortar pump assembly; 41. Mortar pump; 42. Connecting flange; 43. Discharge pipe part; 4301. Feed pipe bracket; 4302. Fixed sleeve 2; 44. Feed pipe part; 5. Mortar tanker; 51. Roller 2; 6. Battery car track; 7. Shield tunnel. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Example See also Figure 1-Figure 6The present invention provides a technical solution: a shield tunnel wall back grouting device, which is arranged in a shield tunnel 7, includes a flatbed car 1, a mortar tank car 5 and a battery car track 6, and a feeding screw assembly 2 and an additive batching machine 3 are arranged on the base 11 of the flatbed car 1, wherein a mortar delivery pump 12 is installed on the base 11 of the flatbed car 1, one end of the mortar delivery pump 12 is connected to a grouting valve assembly 15 through a grouting hose 14, and a feed hopper 13 is arranged at the other end of the mortar delivery pump 12, and the feed hopper 13 is arranged at the outlet end of the feeding screw assembly 2, for storing the mortar pumped by the feeding screw assembly 2. The additive batching machine 3 is fixedly installed on the base 11, and a mortar pump assembly 4 is arranged at the front end of the mortar tank truck 5. The mortar pump assembly 4 includes a feed pipe part 44, a mortar pump 41 and a discharge pipe part 43. Both ends of the mortar pump 41 are respectively provided with connecting flanges 42. The feed pipe part 44 and the discharge pipe part 43 are connected to the mortar pump 41 through the connecting flanges 42. One end of the feed pipe part 44 is installed at the bottom of the mortar tank truck 5. The mortar tank truck 5 is connected to the flatbed truck 1 through the mortar pump assembly 4. The mortar pump assembly 4 sends the mortar pump 41 in the mortar tank truck 5 to the feeding screw assembly 2 through the mortar pump 41. Four rollers 16 and four rollers 2 51 are symmetrically arranged at the bottom of the mortar tank truck 5 and the flatbed truck 1, respectively. The rollers 16 and 51 roll with the battery car track 6. At the same time, the flatbed truck 1 and the mortar tank truck 5 are connected by a connecting plate (not shown in the figure), and the battery locomotive (not shown in the figure) drives the flatbed truck 1 and the mortar tank truck 5 to move on the battery car track 6, so that the grouting device can move in the shield tunnel 7.

[0022] As a preferred solution, further, Figure 2 , Figure 3 As shown, positioning angle steels 17 are provided at the four corners of the flatbed truck 1. The positioning angle steels 17 are provided with four sections. One end of the positioning angle steel 17 is welded to the flatbed truck 1 and is not less than 50mm higher than the table surface of the flatbed truck 1. The size of the base 11 is determined according to the size of the flatbed truck 1, and the base 11 is fixed on the positioning angle steel 17. The material of the positioning angle steel 17 is 100×100×6×150mm.

[0023] As a preferred solution, further, Figure 4As shown, the feeding screw assembly 2 includes a feeding screw bracket 22, a feeding screw machine 21 and a screw machine hopper 23. The screw machine hopper 23 is arranged on the top of the feeding screw machine 21, and the feeding screw machine 21 is connected to the feeding screw bracket 22 by a fixing bolt 24. The feeding spiral bracket 22 adopts a steel structure for supporting the feeding spiral machine 21. The feeding spiral bracket 22 includes a bottom support 2202, a leg 1 2201, a leg 2203 and a fixing sleeve 1 2204. The bottom support 2202 is fixedly installed on the base 11. The fixing sleeve 1 2204 is welded to the top of the leg 1 2201 and the leg 2 2203 respectively. The inclination angle of the two fixing sleeves 2204 is determined according to the installation size of the feeding spiral machine 21. At the same time, the fixing sleeve 1 2204 adopts two semicircular barrel structures. The diameter of the fixing sleeve 1 2204 matches the outer diameter of the feeding spiral machine 21. The length of the fixing sleeve 1 2204 is not less than 300mm, and the material of the fixing sleeve 1 2204 is 10mm steel plate.

[0024] As a preferred solution, further, Figure 5 As shown, the additive batching machine 3 is fixedly connected to the feeding screw assembly 2 through a support assembly 32. The additive batching machine 3 includes an additive storage hopper 34 and a weighing screw machine 31. The weighing screw machine 31 is connected to the bottom of the additive storage hopper 34 through a transmission mechanism 33. The weighing screw machine 31 is provided with a transmission mechanism 33 for conveying the additive in the additive storage hopper 34 to the screw machine hopper 23. By controlling the rotation speed of the weighing screw machine 31, the amount of additive added can be accurately controlled. The outlet of the weighing screw machine 31 is set at the upper end of the screw machine hopper 23, and the bottom of the additive storage hopper 34 is set to be conical.

[0025] As a preferred solution, further, Figure 6 As shown, the discharge pipe part 43 is connected to the base 11 through a feed pipe bracket 4301, a second fixing sleeve 4302 is provided on the feed pipe bracket 4301, and the discharge pipe part 43 is fixedly connected to the second fixing sleeve 4302 through a fixing bolt 24, wherein the diameter of the second fixing sleeve 4302 matches the diameter of the discharge pipe part 43. The outlet end of the discharge pipe part 43 is arranged at the upper end of the screw machine hopper 23, so as to ensure that the screw machine hopper 23 performs preliminary mixing of the pumped mortar and the additive.

[0026] A specific method for using a shield tunnel wall back grouting equipment system comprises the following steps: S1: Fix and install the grouting device; first install the feeding screw assembly and the additive batching machine on the base, wherein the size of the base is determined according to the size of the flatbed truck. During the installation, ensure that the outlet of the additive batching machine is fixed above the screw machine hopper in the feeding screw assembly. Then, hoist the base and the mortar delivery pump, feed hopper, feeding screw assembly and additive batching machine installed on the base onto the flatbed truck. The base is fixed by positioning angle steels welded to the four corners of the flatbed truck. Finally, connect the mortar pump outlet in the existing mortar tank truck with the feed port of the mortar pump assembly, and fix the outlet of the mortar pump assembly to the base of the flatbed truck through a feeding pipe bracket. The feeding pipe bracket is made according to the on-site space. At the same time, the mortar delivery pump, feeding screw assembly, additive batching machine, mortar tank truck and matching mortar pump are powered by a 400V power supply in the tunnel.

[0027] S2: Grouting operation of the grouting device: After the grouting device is installed in place, the equipment system is debugged first. After the debugging is qualified, the entire grouting device is driven by a battery locomotive and moves on the battery car track installed in the tunnel. First, mortar that meets the initial setting requirements is injected into the mortar tank car. When the battery car reaches the pre-grouting position in the tunnel and stops, it is securely fixed. Then, the two ends of the grouting hose are respectively connected to the mortar delivery pump and the grouting valve assembly to ensure that the outlet of the grouting valve assembly is fixedly connected to the pre-grouting port. The mortar pump on the mortar tank car is started to deliver mortar to the screw machine hopper of the upper screw assembly. The additive batching machine is started at the same time, and the additive batching machine synchronously conveys the additive to the screw machine hopper. At this time, the mortar and the additive are preliminarily mixed and conveyed by the feeding screw machine to the feed hopper at the feed port of the mortar delivery pump. After the mortar and the additive are fully mixed in the feeding screw machine, the mortar is pumped to the back gap of the shield tunnel through the grouting hose and the grouting valve assembly by the mortar delivery pump to fill the stratum gaps caused by insufficient synchronous grouting or slurry solidification and shrinkage as soon as possible. When the grouting pressure reaches the design requirement, the grouting is stopped, the grouting hose is removed, and the grouting hose is moved to the next grouting point to continue grouting.

[0028] Therefore, the present invention adopts the above-mentioned shield tunnel wall back grouting device and use method, and fills the stratum gap that is insufficient for synchronous grouting by adding cement mortar + additive mortar with a short initial setting time, properly solves the building gap after the synchronous grouting solidifies during the shield excavation process, reduces the stratum settlement caused by the mortar solidification shrinkage and other problems, and effectively changes the shield tunnel wall back grouting effect. At the same time, the additive batching machine feeds the additive into the screw machine hopper and preliminarily mixes it with the mortar pumped by the mortar pump matched with the mortar tank truck, and finally pumps it to the back of the pipe segment through the feeding screw machine, the mortar delivery pump and the grouting hose, and the mortar with the additive added is fully mixed in the feeding screw machine. The whole process realizes mechanical automation, effectively saves manpower, and improves the efficiency of mortar mixing additives.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A shield tunnel wall back grouting device, characterized in that: The grouting device is arranged in the shield tunnel, and the grouting device includes a flatbed truck, a mortar tank truck and an electric car track. The mortar tank truck is connected to the flatbed truck through a connecting plate. The flatbed truck is provided with a mortar delivery pump, a feeding screw assembly and an additive batching machine. The front end of the mortar tank truck is provided with a mortar pump assembly. The flatbed truck, the mortar tank truck and the electric car track are rollingly connected.

2. A shield tunnel wall back grouting device according to claim 1, characterized in that: The flatbed truck is provided with a base and a grouting valve assembly, the mortar delivery pump, the feeding screw assembly, and the additive batching machine are fixedly installed on the base, the discharge port of the mortar delivery pump is connected to the grouting valve assembly through a grouting hose, and the feed port of the mortar delivery pump is provided with a feed hopper, and the feed hopper is arranged below the outlet end of the feeding screw assembly.

3. A shield tunnel wall back grouting device according to claim 2, characterized in that: Positioning angle steels are arranged at the four corners of the flatbed cart, one end of the four sections of the positioning angle steels are welded to the flatbed cart, and the other end is at least 50 mm higher than the table surface of the flatbed cart. The base is placed in the rectangular space formed by the four sections of the positioning angle steels, and four rollers are symmetrically arranged at the bottom of the flatbed cart.

4. A shield tunnel wall back grouting device according to claim 3, characterized in that: The dimensions of the positioning angle steel are: 100×100×6, and the length is not less than 150 mm.

5. A shield tunnel wall back grouting device according to claim 4, characterized in that: The feeding screw assembly includes a feeding screw bracket, a feeding screw machine and a screw machine hopper. The screw machine hopper is arranged at the lower part of the feeding screw machine. The feeding screw bracket is connected to the feeding screw machine and the base through fixing bolts.

6. A shield tunnel wall back grouting device according to claim 5, characterized in that: The feeding spiral bracket adopts a steel structure, and the feeding spiral bracket includes a bottom support, a leg one, a leg two and a fixed sleeve one. The lower parts of the leg one and the leg two are welded to the bottom support, and the tops of the leg one and the leg two are welded to the fixed sleeve one. The diameter of the fixed sleeve one matches the outer diameter of the feeding spiral machine. The fixed sleeve one adopts two semicircular barrel structures, and the length of the fixed sleeve one is not less than 300mm.

7. A shield tunnel wall back grouting device according to claim 6, characterized in that: The additive batching machine includes a weighing screw machine, an additive storage hopper and a support assembly, wherein the support assembly is connected to the base via fixing bolts, the additive batching machine is fixedly mounted on the support assembly, a transmission mechanism is provided on the weighing screw machine, the weighing screw machine is connected to the bottom of the additive storage hopper via the transmission mechanism, and the outlet of the weighing screw machine is provided at the upper end of the screw machine hopper.

8. A shield tunnel wall back grouting device according to claim 7, characterized in that: The mortar pump assembly includes a feed pipe part, a mortar pump and a discharge pipe part. Connecting flanges are respectively provided at both ends of the mortar pump. The feed pipe part and the discharge pipe part are connected to the mortar pump through the connecting flanges. One end of the feed pipe part is installed at the bottom of the mortar tank truck. The discharge pipe part is fixed to the base through a feed pipe bracket. A fixing sleeve 2 is provided on the feed pipe bracket. The discharge pipe part is fixedly connected to the fixing sleeve 2 through fixing bolts. The diameter of the fixing sleeve 2 matches the diameter of the discharge pipe part. The outlet end of the discharge pipe part is arranged at the upper end of the screw machine hopper.

9. A shield tunnel wall back grouting device according to claim 8, characterized in that: The mortar tanker is driven by a battery locomotive to move in the shield tunnel. A second roller is provided at the bottom of the mortar tanker, and the second roller is rollingly connected to the battery locomotive track.

10. A method for using a shield tunnel wall back grouting device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Fix and install the grouting device; first, install the feeding screw assembly and the additive batching machine on the base, wherein the size of the base is determined according to the size of the flatbed truck. During the installation, ensure that the outlet of the additive batching machine is fixed above the screw machine hopper in the feeding screw assembly. Then, hoist the base and the mortar delivery pump, feed hopper, feeding screw assembly and additive batching machine installed on the base onto the flatbed truck. The base is fixed by positioning angle steels welded to the four corners of the flatbed truck. Finally, connect the mortar pump outlet in the existing mortar tank truck with the feed port of the mortar pump assembly, and the outlet of the mortar pump assembly is fixed to the base of the flatbed truck through a feeding pipe bracket. The feeding pipe bracket is made according to the on-site space. At the same time, the mortar delivery pump, feeding screw assembly, additive batching machine, mortar tank truck and the matching mortar pump are powered by a 400V power supply in the tunnel; S2: Grouting operation of the grouting device: After the grouting device is installed in place, the equipment system is debugged first. After the debugging is qualified, the entire grouting device is driven by a battery locomotive and moves on the battery car track installed in the tunnel. First, mortar that meets the initial setting requirements is injected into the mortar tank car. When the battery car stops at the pre-grouting position in the tunnel, it is securely fixed. Then, the two ends of the grouting hose are respectively connected to the mortar delivery pump and the grouting valve assembly to ensure that the outlet of the grouting valve assembly is reliably and fixedly connected to the pre-grouting port. The mortar pump on the mortar tank car is started to deliver mortar to the screw machine hopper of the upper screw assembly. At the same time, the additive batching machine is started, and the additive batching machine synchronously conveys the additive to the screw machine hopper. At this time, the mortar and the additive are preliminarily mixed and conveyed by the feeding screw machine to the feed hopper at the feed port of the mortar delivery pump. After the mortar and the additive are fully mixed in the feeding screw machine, the mortar is pumped to the back gap of the shield tunnel through the grouting hose and the grouting valve assembly by the mortar delivery pump to fill the stratum gaps caused by insufficient synchronous grouting or slurry solidification and shrinkage as soon as possible. When the grouting pressure reaches the design requirement, the grouting is stopped, the grouting hose is removed, and the grouting hose is moved to the next grouting point to continue grouting.

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