Large-diameter secondary grouting construction process for expansive mud sandstone tunnel

Abstract

The invention relates to the field of tunnel grouting construction, in particular to an expansion mud sandstone tunnel large-diameter secondary grouting construction technology which comprises the following steps that S1, a hole is drilled in a preset position to form an anchor rod hole; the anchor rod hole is cleaned till no surrounding rock large-particle chippings exist in the anchor rod hole; a secondary grouting hole is drilled, and a secondary grouting pipe is installed in the grouting hole; s2, anchor rods are installed in the anchor rod holes till the anchor rods are inserted into the hole bottoms of the anchor rod holes; s3, the anchor rod is withdrawn by 50 mm; grouting is conducted, and grout is mortar; after the mortar is fully filled and the pressure value reaches the screen mortar condition, single-hole grouting is ended after continuous grouting is carried out for not less than 10 minutes; the hole opening is densely filled with dry and hard cement mortar; and S4, secondary high-pressure grouting is conducted through grouting equipment, the slurry is cement slurry, and high-pressure secondary grouting is conducted through the reserved secondary splitting grouting pipe 10 min before final setting of the first-time grouting slurry. The method has the effect of improving the firmness of the surrounding rock after grouting.

Description

Technical Field

[0001] The present application relates to the field of tunnel grouting construction, and in particular to a large-diameter secondary grouting construction process for swelling mudstone tunnels. Background Art

[0002] The swelling mudstone tunnel project occupies an important position in the development of underground space, and its stability is directly related to the safety and long-term use of the project. Good tunnel reinforcement treatment can effectively prevent problems such as surrounding rock deformation and collapse, ensure the safety of personnel and equipment, improve the service life of the project, reduce the later maintenance cost, and is of crucial significance for the development of many fields such as transportation and water conservancy.

[0003] In the traditional grouting construction of swelling mudstone tunnels, for similar reinforcement problems, relatively conventional methods are generally adopted. The common one is the single grouting process, directly injecting a single type of slurry into the tunnel.

[0004] However, the reinforcement range of the traditional single grouting is small, and it is difficult to meet the reinforcement requirements under the complex geological conditions of swelling mudstone tunnels, resulting in poor reinforcement effects; therefore, providing a process that can improve the firmness of the surrounding rock after grouting is an urgent problem to be solved. Summary of the Invention

[0005] In order to improve the firmness of the surrounding rock after grouting, the present application provides a large-diameter secondary grouting construction process for swelling mudstone tunnels.

[0006] A large-diameter secondary grouting construction process for swelling mudstone tunnels provided by the present application adopts the following technical solutions: A large-diameter secondary grouting construction process for swelling mudstone tunnels includes the following steps: S1: Hole forming: Drill holes at the preset positions to form anchor holes; Clean the anchor holes until there are no large particles of surrounding rock debris in the anchor holes; Drill secondary grouting holes and install secondary grouting pipes into the grouting holes; S2: Install anchor bolts: Install the anchor bolts into the anchor holes until the anchor bolts reach the bottom of the anchor holes; S3: Primary grouting: Withdraw the anchor bolts by 50 mm; Perform grouting, and the slurry is mortar; After the mortar is filled, when the pressure value reaches the screen grouting condition, continue to grout for not less than 10 minutes and then end the single-hole grouting; Seal the orifice tightly with dry hard cement mortar and level the orifice part; S4: Perform secondary high-pressure grouting using a grouting device, and the slurry is cement slurry: When the first grouting slurry is about to set in the last 10 minutes, high-pressure secondary grouting is carried out using the reserved secondary splitting grouting pipe.

[0007] By adopting the above technical solution, before the first grouting, the grouting pipe for secondary splitting grouting is reserved, and secondary grouting is carried out before the first grouting slurry sets, which can effectively increase the grouting range and improve the stability and firmness of the surrounding rock after grouting.

[0008] Optionally, the grouting equipment is installed on a walking device, and the walking device includes: Two support plates, one of which is the main support plate (a) and the other is the auxiliary support plate (b); the grouting equipment is installed on the main support plate (a); the support plates are perpendicular to the first direction, and the two support plates are spaced apart in the second direction; A first linear driving member, the driving direction of the first linear driving member is parallel to the second direction, and the first linear driving member is connected between the two support plates to be used for changing the distance between the two support plates in the second direction; and A walking device, and corresponding walking devices are respectively provided on the main support plate (a) and the auxiliary support plate (b); the walking device includes: A lifting plate, in the first direction, the lifting plate is located on the side of the support plate away from the grouting equipment; and A second linear driving member, the driving direction of the second linear driving member is parallel to the first direction, one end of the second linear driving member is connected to the lifting plate, and the other end is connected to the support plate to change the distance between the support plate and the lifting plate in the third direction.

[0009] By adopting the above technical solution, the flatness in the tunnel is relatively low. When moving forward with a wheeled structure, it may cause excessive bumpiness or inability to pass. However, adopting the structure with gaps in this application can improve the stability; specifically, after one lifting plate is lifted, the first linear driving member extends and increases the distance between the two support plates. Subsequently, this lifting plate drops, and then after the other lifting plate is lifted, the first linear driving member shortens, so as to change the position of the grouting equipment; during the grouting process, the grouting equipment can be moved back and forth to adapt to grouting at different positions, improving the flexibility and ensuring the smooth progress of the grouting process.

[0010] Optionally, the walking device further includes: A telescopic rod, the telescopic direction of the telescopic rod is parallel to the second direction, and one end of the telescopic rod is fixedly connected to the auxiliary support plate (b), and the other end is fixedly connected to the body of the grouting equipment.

[0011] By adopting the above technical solution, the telescopic rod can play a guiding role between the grouting equipment and the auxiliary support plate.

[0012] Optionally, a plurality of the telescopic rods are provided, and the plurality of telescopic rods are sequentially distributed in the third direction.

[0013] By adopting the above technical solution, it can better guide the movement between the two support plates and between the auxiliary support plate and the grouting equipment in the second direction, and improve the stability of the equipment operation.

[0014] Optionally, a plurality of the traveling devices are respectively provided on each corresponding support plate.

[0015] By adopting the above technical solution, setting a plurality of traveling devices on each support plate can improve the stability of the traveling equipment when it is traveling.

[0016] Optionally, the traveling equipment further includes an adjusting component, and the adjusting component is respectively provided on each corresponding support plate. The adjusting component includes: A plurality of rotating bars, the rotating bars are rotatably connected to the support plate around a first axis, and the first axis is parallel to the first direction; each of the traveling devices is respectively connected to one of the rotating bars.

[0017] By adopting the above technical solution, after rotating the rotating bar around the first axis, the position of the lifting plate on the ground can be changed, so as to avoid uneven areas.

[0018] Optionally, the adjusting component further includes: A plurality of sliding blocks, one sliding block is respectively provided on each corresponding rotating bar, and the sliding block is slidably connected to the rotating bar along the radius of a virtual circle, and the central axis of the virtual circle coincides with the first axis; Each of the sliding blocks is respectively connected between one of the traveling devices.

[0019] By adopting the above technical solution, moving the sliding block along the rotating bar can further expand the landing range of the traveling device and more flexibly adjust the position of the equipment.

[0020] Optionally, the traveling equipment further includes an auxiliary support component, and the auxiliary support component is respectively provided on each corresponding support plate. The auxiliary support component includes: A third linear driving member, the driving direction of the third linear driving member is parallel to the first direction; A vertical plate, in the second direction, the vertical plate is located between the support devices on the two support plates; one end of the third linear driving member is fixedly connected to the vertical plate, and the other end is fixedly connected to the support plate; and A plurality of support bars, the support bars are arranged parallel to the second direction, and the plurality of support bars are spaced apart in the third direction. An insertion gap is formed between two adjacent support bars, and the insertion gap is for a support bar connected to another support plate to be inserted; Moreover, a translation gap communicating with the insertion gap is also formed through the end of the vertical plate far from the support plate in the second direction, for the support bar connected to another support plate to move along the first direction after being inserted; In the second direction, one end of the support bar is a fixed end and the other end is a suspended end. The fixed end of the support bar is fixedly connected to the vertical plate, and the suspended end extends towards the side of the vertical plate on another support plate; In the second direction, the center of gravity of the grouting device falls between the fixed end and the free end of the support bar.

[0021] By adopting the above technical solution, the traveling device and the support bar on one support plate can move up and down synchronously during the traveling process, so that the traveling device on the other support plate can cooperate with the supporting effect of the support bar on this support plate, avoiding the whole device from tipping over, thereby improving the traveling stability of the device.

[0022] Optionally, a support claw is fixedly connected to the lifting plate. The support claw includes: A vertical rod, the vertical rod is fixedly connected to the lifting plate; and A plurality of inclined rods, one end of the inclined rod is fixedly connected to the vertical rod, and an obtuse angle is formed between the other end and the vertical rod.

[0023] By adopting the above technical solution, a support claw composed of a vertical rod and a plurality of inclined rods is fixedly connected to the lifting plate. After the plurality of inclined rods touch the ground, they can support the whole device, further avoiding uneven positions.

[0024] Optionally, a plurality of support claws are provided on each lifting plate.

[0025] By adopting the above technical solution, with multiple support claws supporting synchronously, the support stability can be further improved.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: Through the construction process of first grouting thick slurry once and then grouting mortar under high pressure twice, the reinforcement effect of the tunnel can be better improved, the stability of the surrounding rock can be enhanced, and problems such as deformation and collapse of the surrounding rock can be prevented; The grouting device is installed on a traveling device with a first linear driving member, a traveling device, etc., and can move by itself without manual handling or simple track transportation, improving the flexibility of the movement of the grouting device, being able to accurately reach the designated position, and enhancing the construction accuracy and overall progress; The setting of the auxiliary support assembly enables the walking device and the support bar on one of the support plates to move up and down synchronously, and the walking device on the other support plate cooperates with the support function of the support bar, which can prevent the whole device from tipping over and further improve the walking stability of the device. Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram of the walking device from the first perspective in the embodiment of the present application; Figure 2 is the overall structural schematic diagram of the walking device from the second perspective in the embodiment of the present application; Figure 3 is Figure 2 the enlarged view of part A in Figure 4 is the structural schematic diagram of the auxiliary support assembly in the embodiment of the present application.

[0028] Description of the reference signs: 01, grouting equipment; 1, support plate; 1a, main support plate; 1b, auxiliary support plate; 11, telescopic rod; 12, vertical plate; 13, guide groove; 2, first linear drive member; 3, walking device; 31, lifting plate; 32, second linear drive member; 33, support claw; 331, vertical rod; 332, inclined rod; 4, adjustment assembly; 41, rotating bar; 411, dovetail block; 42, sliding block; 5, drive assembly; 51, internal gear ring; 52, mounting seat; 53, gear; 54, first motor; 6, linear motor; 61, guiding part; 62, driving part; 7, auxiliary support assembly; 71, third linear drive member; 72, vertical plate; 721, translation gap; 73, support bar; 731, insertion gap; 732, fixed end; 733, suspended end. Detailed Description of the Embodiment

[0029] The following further describes the present application in detail with reference to the Figures 1-4 drawings. For the convenience of description, the present application introduces azimuth terms such as the first direction, the second direction, and the third direction to form a three-dimensional reference direction. The azimuth terms such as "the first direction, the second direction, and the third direction" can specifically refer to the figure shown, where X represents the first direction, Y represents the second direction, Z represents the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0030] The embodiment of the present application discloses a large-diameter secondary grouting construction process for an expansive mudstone tunnel. The large-diameter secondary grouting construction process for an expansive mudstone tunnel includes the following steps: S1: Hole formation: Drill a hole at a preset position to form a bolt hole; Irrigate and clean the bolt hole with a high-pressure water gun until there are no large particles of surrounding rock debris in the bolt hole and the flowing water is basically clear, indicating that the rock powder and soil debris in the hole have been cleaned; Drill secondary grouting holes and install secondary grouting pipes into the grouting holes; S2: Install anchor bolts: Install the anchor bolts into the anchor bolt holes until the anchor bolts reach the bottom of the anchor bolt holes; S3: Primary grouting: After the anchor bolts are withdrawn 50 mm, start the grouting construction; Grout, and the grout is mortar; After the mortar is filled, when the pressure value reaches the screen grouting condition, continue grouting for not less than 10 min and then end the single-hole grouting; Seal the hole opening tightly with dry hard cement mortar at the hole opening and level the hole opening part; S4: Conduct secondary high-pressure grouting with a grouting device, and the grout material is pure cement slurry with a water-cement ratio of 0.45 - 0.50: 10 min before the final setting of the primary grouting slurry, use the reserved secondary splitting grouting pipe to conduct high-pressure secondary grouting; For secondary grouting, it is necessary to conduct secondary splitting and extrusion on the surrounding rock mass on the basis of the anchor solid formed by the primary grouting to form a special-shaped expanded body, so as to achieve the reinforcement of the anchoring capacity and the strengthening and compaction effect. Therefore, high-pressure grouting is required. During the implementation process, the grouting pressure is selected to be 1.5 MPa - 2.5 MPa.

[0031] When conducting secondary grouting, refer to Figure 1 , the grouting device is installed on the walking device, and the walking device includes two support plates 1, and also includes a first linear driving member 2 and a walking device 3; The support plate 1 is perpendicular to the first direction. In this application, the first direction is the vertical direction, that is to say, the support plate 1 is horizontally arranged; the two support plates 1 are spaced apart in the second direction. Among the two support plates 1, one is the main support plate 1a and the other is the auxiliary support plate 1b. The grouting device 01 is installed on the main support plate 1a. Specifically, the housing of the grouting device 01 is fixedly connected to the main support plate 1a so that the grouting device 01 is fixed on the main support plate 1a; The driving direction of the first linear driving member 2 is parallel to the second direction. The first linear driving member 2 is connected between the two support plates 1 to be used for changing the distance between the two support plates 1 in the second direction; in order to improve the stability, a plurality of first linear driving members 2 are installed between the two support plates 1; in this disclosure, the first linear driving member 2 is a cylinder, the cylinder body of the first linear driving member 2 is fixedly connected to one of the support plates 1, and the piston rod is fixedly connected to the other support plate 1.

[0032] Refer to Figure 1, in some embodiments of the present application, the walking device further includes telescopic rods 11. In the third direction, a plurality of telescopic rods 11 are distributed at intervals; the telescopic direction of the telescopic rods 11 is parallel to the second direction, and one end of the telescopic rod 11 is fixedly connected to the auxiliary support plate 1b, and the other end is fixedly connected to the body of the grouting device 01; in order to fix the telescopic rod 11 to the auxiliary support plate 1b, a vertical plate 12 is fixedly connected to the upper surface of the auxiliary support plate 1b, and the end of the telescopic rod 11 is fixedly connected to the vertical plate 12. Under the action of the telescopic rod 11, it is possible to guide the movement between the two support plates 1 and along the second direction between the auxiliary support plate 1b and the grouting device 01.

[0033] Referring to Figure 2 and Figure 3 , in order to make the grouting device 01 move forward, corresponding traveling devices 3 are provided on each of the main support plate 1a and the auxiliary support plate 1b. And in order to improve the stability, in some embodiments of the present application, a plurality of traveling devices 3 are correspondingly provided on each support plate 1; the traveling device 3 includes a lifting plate 31 and a second linear driving member 32. In the first direction, the lifting plate 31 is located on the side of the support plate 1 away from the grouting device 01, that is, the lifting plate 31 is located below the support plate 1; the driving direction of the second linear driving member 32 is parallel to the first direction, one end of the second linear driving member 32 is connected to the lifting plate 31, and the other end is connected to the support plate 1 to change the distance between the support plate 1 and the lifting plate 31 in the third direction; in the present disclosure, the second linear driving member 32 is a jack, the cylinder body of the second linear driving member 32 is fixedly connected to the lifting plate 31, and the piston rod of the second linear driving member 32 is connected to the support plate 1; During the forward movement, the lifting plate 31 on the auxiliary support plate 1b is lifted to be separated from the ground, and then the first linear driving member 2 drives the auxiliary support plate 1b to move forward to a designated position, and then the lifting plate 31 falls to the ground; subsequently, the lifting plate 31 on the main support plate 1a is lifted to be separated from the ground, and then after the first linear driving member 2 contracts, it drives the main support plate 1a to move forward to a designated position, and then the lifting plate 31 falls to the ground, thus completing a certain distance of forward movement. Subsequently, the foregoing process is repeated until the grouting device 01 moves forward to the required position.

[0034] Referring to Figure 3 , in some embodiments of the present application, a support claw 33 is further provided on the lifting plate 31. The support claw 33 is located on the side of the lifting plate 31 away from the support plate 1, that is, the support claw 33 is located below the lifting plate 31; the support claw 33 includes a vertical rod 331 and a plurality of inclined rods 332. The vertical rod 331 is fixedly connected to the lifting plate 31, and the inclined rod 332 is fixedly connected to the end of the vertical rod 331 away from the lifting plate 31. An obtuse angle is formed between the inclined rod 332 and the vertical rod 331 so as to support the entire device after the plurality of inclined rods 332 touch the ground.

[0035] Referring to Figure 3, during the forward movement, in order to facilitate adjusting the landing point of the lifting plate 31, in some embodiments of the present application, the walking device further includes an adjusting assembly 4. An adjusting assembly 4 is correspondingly provided on each support plate 1. The adjusting assembly 4 includes a rotating bar 41. The rotating bar 41 is rotatably connected to the support plate 1 around a first axis, and the first axis is parallel to the first direction. In order to guide the rotation of the rotating bar 41, an annular guiding groove 13 is opened on the bottom wall of the support plate 1. The cross-section of the guiding groove 13 is dovetail-shaped. A dovetail block 411 adapted to the cross-section of the guiding groove 13 is fixedly connected to the surface of the rotating bar 41 close to the support plate 1. The dovetail block 411 is adapted to be located in the guiding groove 13 and can rotate around the first axis under the guidance of the groove wall of the guiding groove 13. In order to drive the rotating bar 41 to rotate around the first axis, a driving assembly 5 is further provided on the support plate 1. The driving assembly 5 includes an internal gear ring 51, a mounting seat 52, a gear 53, and a first motor 54. The internal gear ring 51 is fixedly connected to the lower wall surface of the support plate 1 and is coaxial with the virtual circle. The central axis of the virtual circle coincides with the first axis. The mounting seat 52 is an L-shaped seat, and the mounting seat 52 is fixedly connected to the rotating bar 41. The first motor 54 is a servo motor. The housing of the first motor 54 is fixedly connected to the mounting seat 52. The output shaft of the first motor 54 is coaxially fixedly connected to the gear 53, and the gear 53 meshes with the internal gear ring 51. So that the first motor 54 drives the gear 53 to rotate. During the rotation of the gear 53, under the cooperation of the gear 53 and the internal gear ring 51, the gear 53 will rotate around the first axis to realize the rotation of the connecting bar around the first axis.

[0036] Refer to Figure 3 , in order to further increase the landing range of the walking device 3, in some embodiments of the present application, the adjusting assembly 4 further includes a plurality of sliding blocks 42. A sliding block 42 is correspondingly provided on each rotating bar 41. The sliding block 42 is slidably connected to the rotating bar 41 along the radius of the virtual circle, and each sliding block 42 is correspondingly connected to a walking device 3. Specifically, the end of the second linear driving member 32 far from the lifting plate 31 is fixedly connected to the sliding block 42 to be indirectly connected to the support plate 1, and realizes moving along the radius of the virtual circle while rotating on the support plate 1 to change the landing position of the walking device 3. In order to drive the sliding block 42 to move along the radius of the virtual circle, a linear motor 6 with a guiding portion 61 and a driving portion 62 is provided between the rotating bar 41 and the sliding block 42. The guiding portion 61 of the linear motor 6 is fixedly connected to the rotating bar 41. The driving portion 62 of the linear motor 6 can move along the radius of the virtual circle under the self-driving action of the linear motor 6. The sliding block 42 is fixedly connected to the driving portion 62 of the linear motor 6 to move synchronously with the driving portion 62.

[0037] Refer to Figure 2 and Figure 4, in order to improve the walking stability of the entire device, in some embodiments of the present application, the walking device further includes an auxiliary support assembly 7. Each support plate 1 is correspondingly provided with an auxiliary support assembly 7. The auxiliary support assembly 7 includes a third linear driving member 71, a vertical plate 72, and a plurality of support bars 73; The driving direction of the third linear driving member 71 is parallel to the first direction. In the present disclosure, the third linear driving member 71 is a jack. In the second direction, the vertical plate 72 is located between the support devices on the two support plates 1; one end of the third linear driving member 71 is fixedly connected to the vertical plate 72, and the other end is fixedly connected to the support plate 1 to drive the vertical plate 72 to move along the first direction; The support bars 73 are arranged parallel to the second direction. The plurality of support bars 73 are spaced apart in the third direction. An insertion gap 731 is formed between adjacent two support bars 73 for the support bars 73 connected to another support plate 1 to be inserted; and, a translation gap 721 communicating with the insertion gap 731 is also formed through the vertical plate 72 at the end away from the support plate 1 along the second direction for the support bars 73 connected to another support plate 1 to move along the first direction after being inserted; In the second direction, one end of the support bar 73 is a fixed end 732, and the other end is a suspended end 733. The fixed end 732 of the support bar 73 is fixedly connected to the vertical plate 72, and the suspended end 733 extends toward the vertical plate 72 on the other support plate 1; the support bars 73 in the two auxiliary support assemblies 7 can be inserted into the insertion gap 731 and the translation gap 721 formed by the other auxiliary support assembly 7; And, in the second direction, the center of gravity of the grouting device 01 falls between the fixed end 732 and the free end of the support bar 73; during the walking process, the walking device 3 and the support bar 73 on one support plate 1 move up and down synchronously, and the walking device 3 on the other support plate 1 cooperates with the supporting action of the support bar 73 on this support plate 1, which can prevent the entire device from tipping over.

[0038] The principle of using the walking device to drive the grouting device 01 forward is as follows: the lifting plate 31 and the support bar 73 on one support plate 1 rise, move forward and then descend, and the lifting plate 31 and the support bar 73 on the other support plate 1 rise, move forward and then descend, and the forward operation can be realized; when it is necessary to change the landing point of the lifting plate 31, only need to drive the gear 53 to rotate by the first motor 54. During the process of the gear 53 rotating along the toothed ring, the walking device 3 will move accordingly, and thus the landing point of the lifting plate 31 can be changed.

[0039] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A construction process for secondary grouting with large diameter in swelling mudstone tunnels, characterized in that, It includes the following steps: S1: Hole forming: Drill a hole at a preset position to form an anchor rod hole; Clean the anchor rod hole until there are no large particles of surrounding rock debris in the anchor rod hole; Drill a secondary grouting hole and install a secondary grouting pipe into the grouting hole; S2: Install the anchor rod: Install the anchor rod into the anchor rod hole until the anchor rod reaches the bottom of the anchor rod hole; S3: Primary grouting: Withdraw the anchor rod by 50 mm; Inject grout, and the grout is mortar; After the mortar is filled, when the pressure value reaches the screen grouting condition, continue to inject for no less than 10 minutes and then end the single-hole grouting; Seal the hole opening tightly with dry hard cement mortar at the hole opening and level the hole opening part; S4: Use a grouting device to perform secondary high-pressure grouting, and the slurry is cement slurry: 10 minutes before the final setting of the first grouting slurry, use the reserved secondary splitting grouting pipe to perform high-pressure secondary grouting.

2. The construction process of secondary grouting with large diameter for swelling mudstone tunnels according to claim 1, characterized in that, The grouting device (01) is installed on a walking device, and the walking device includes: Two support plates (1), one of which is the main support plate (1a) and the other is the auxiliary support plate (1b); the grouting device (01) is installed on the main support plate (1a); the support plate (1) is perpendicular to the first direction, and the two support plates (1) are spaced apart in the second direction; A first linear driving member (2), the driving direction of the first linear driving member (2) is parallel to the second direction, and the first linear driving member (2) is connected between the two support plates (1) to be used for changing the distance between the two support plates (1) in the second direction; and A walking device (3), and the walking device (3) is correspondingly provided on each of the main support plate (1a) and the auxiliary support plate (1b); the walking device (3) includes: A lifting plate (31), in the first direction, the lifting plate (31) is located on the side of the support plate (1) away from the grouting device (01); and A second linear driving member (32), the driving direction of the second linear driving member (32) is parallel to the first direction, one end of the second linear driving member (32) is connected to the lifting plate (31), and the other end is connected to the support plate (1) to change the distance between the support plate (1) and the lifting plate (31) in the third direction.

3. The large-diameter secondary grouting construction technology for expanding argillaceous siltstone tunnels according to claim 2, characterized in that, The walking device further includes: A telescopic rod (11), the telescopic direction of the telescopic rod (11) is parallel to the second direction, and one end of the telescopic rod (11) is fixedly connected to the auxiliary support plate (1b), and the other end is fixedly connected to the body of the grouting device (01).

4. The construction process of large-diameter secondary grouting for swelling mudstone tunnels according to claim 3, characterized in that, There are multiple telescopic rods (11), and the multiple telescopic rods (11) are sequentially distributed in the third direction.

5. The construction process of secondary grouting with large diameter for swelling mudstone tunnel according to claim 3, characterized in that Each of the support plates (1) is correspondingly provided with multiple walking devices (3).

6. The construction process of secondary grouting with large diameter for swelling mudstone tunnel according to claim 5, characterized in that, The walking device further includes an adjusting component (4), and the adjusting component (4) is correspondingly provided on each of the support plates (1), and the adjusting component (4) includes: Multiple rotating bars (41), the rotating bars (41) are rotatably connected to the support plate (1) around the first axis, and the first axis is parallel to the first direction; each walking device (3) is correspondingly connected to one of the rotating bars (41).

7. The construction process of secondary grouting with large diameter for swelling mudstone tunnels according to claim 6, characterized in that, The adjustment assembly (4) further includes: A plurality of sliding blocks (42), each of the rotating bars (41) is correspondingly provided with a sliding block (42), and the sliding block (42) is slidably connected to the rotating bar (41) along the radius of the virtual circle, and the central axis of the virtual circle coincides with the first axis; Each of the sliding blocks (42) is correspondingly connected between one of the traveling devices (3).

8. A construction process for secondary grouting with large diameter in an expansive argillaceous sandstone tunnel according to claim 7, characterized in that The traveling device further includes an auxiliary support assembly (7), and each of the support plates (1) is correspondingly provided with the auxiliary support assembly (7). The auxiliary support assembly (7) includes: A third linear drive (71), the driving direction of the third linear drive (71) is parallel to the first direction; A vertical plate (72), in the second direction, the vertical plate (72) is located between the support devices on the two support plates (1); one end of the third linear drive (71) is fixedly connected to the vertical plate (72), and the other end is fixedly connected to the support plate (1); and A plurality of support bars (73), the support bars (73) are arranged parallel to the second direction, and the plurality of support bars (73) are spaced apart in the third direction. An insertion gap (731) is formed between two adjacent support bars (73), and the insertion gap (731) is used for the support bar (73) connected to the other support plate (1) to be inserted; And, a translation gap (721) communicating with the insertion gap (731) is also formed through the vertical plate (72) at the end away from the support plate (1) in the second direction, for the support bar (73) connected to the other support plate (1) to move in the first direction after being inserted; In the second direction, one end of the support bar (73) is a fixed end (732), and the other end is a suspended end (733). The fixed end (732) of the support bar (73) is fixedly connected to the vertical plate (72), and the suspended end (733) extends toward the side of the vertical plate (72) on the other support plate (1); In the second direction, the center of gravity of the grouting device (01) falls between the fixed end (732) and the free end of the support bar (73).

9. A construction process for secondary grouting with large diameter in swelling mudstone tunnels according to any one of claims 2 - 8, characterized in that A support claw (33) is fixedly connected to the lifting plate (31). The support claw (33) includes: A vertical rod (331), the vertical rod (331) is fixedly connected to the lifting plate (31); and A plurality of inclined rods (332), one end of the inclined rod (332) is fixedly connected to the vertical rod (331), and an obtuse angle is formed between the other end and the vertical rod (331).

10. The construction process of secondary grouting with large diameter for swelling mudstone tunnels according to claim 9, characterized in that, A plurality of support claws (33) are provided on each of the lifting plates (31).

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