Hydraulic pipe inserting machine for micro-disturbance grouting reinforcement in subway tunnel hole and grouting technology

Abstract

The invention discloses a micro-disturbance grouting process in a subway tunnel hole. The micro-disturbance grouting process comprises the steps that orifice pipes are pre-buried, wherein the orifice pipes are pre-buried at the fifth point and the seventh point of a ballast bed; when the grouting orifice pipe is pre-buried, the periphery of the orifice pipe is uniformly coated with embedded steel bar glue, and the orifice pipe is rotationally inserted in one direction when being inserted into a pre-buried hole, so that the periphery in the hole is uniformly and compactly bonded, and the embedded steel bar glue overflows from the orifice; drilling is conducted on the day, an orifice pipe is pre-buried on the day, and a blank cap is installed; a water pressure pressing test and an orifice pipe pull-out test are carried out; drilling through a water drill to break through the duct piece; and pipe inserting and grouting. The micro-disturbance grouting technology in the subway tunnel hole is used in cooperation with a hydraulic pipe inserting machine, the construction working face can be increased, lining structure deformation can be reduced, the settlement control repairing period can be shortened, and a more flexible and efficient structure deformation convergence and settlement repairing and reinforcing scheme is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel lining structure deformation repair, and particularly to a hydraulic pipe inserting machine for micro-disturbance grouting reinforcement in a subway tunnel and a grouting process. Background Art

[0002] With the development of economic construction and the continuous increase of subway operation mileage, there are more and more engineering constructions near the subway, and the project volume is also getting larger and larger, inevitably causing large deformations in the subway tunnel. In recent years, the micro-disturbance grouting method, as a process with little impact on the surrounding environment, strong controllability and good reinforcement effect, has become an important means for subway tunnel deformation repair.

[0003] Among the deformations of the subway tunnel, settlement and convergence deformations are of particular concern. Generally, the repair method for settlement deformation is to drill down from the bottom of the subway tunnel, penetrate the segment, and then extend the grouting pipe from inside the tunnel into the lower soil layer for lifting grouting. The repair method for subway tunnel convergence is generally to vertically press the grouting pipe down from the ground at a certain distance on both sides of the tunnel and perform grouting on the side of the tunnel to reduce the transverse diameter of the tunnel through the lateral extrusion pressure of the grouting.

[0004] With the passage of time, longitudinal deformations of different degrees will occur in some sections of the subway operation tunnel, resulting in situations such as the separation of the ballast bed from the segment and tunnel water leakage. The factors causing tunnel longitudinal deformation are relatively complex, including those during the tunnel construction period and after subway operation, those related to the system itself and those caused by changes in the surrounding environment. They are mainly manifested in the inadequate consideration during the construction period or potential hidden dangers reserved during the shield tunneling process; defects such as differential settlement of the tunnel caused by long-term vibration settlement of trains; the impact of hundreds of new, renovated and expanded projects and municipal engineering projects implemented within the subway safety protection area on the subway structure; and more and more construction of subway tunnels, underground pipelines and other structures passing through the existing operation tunnel, thus causing problems such as differential settlement of the existing operation tunnel. If the differential settlement of the operation tunnel is not controlled in time and allowed to develop, it will affect the operation safety of the subway.

[0005] Currently, the commonly used grouting methods include compaction grouting, jet grouting, splitting grouting, etc. Although their construction methods are different, they only stipulate the grouting volume and grouting pressure in the grouting parameters and do not pay attention to the refined control of the grouting process. This may meet the requirements for relatively good strata or environmental conditions. In the existing grouting technology, the selection of hole positions often directly drills holes at the position of a single protection object, unable to take into account the complex surrounding environment. The hole layout is relatively simple and generally only considers the final grouting effect without considering the disturbance problem during the grouting process. Therefore, the result is often counterproductive. Especially in the case of extremely high environmental protection requirements, especially when the deformation needs to be controlled within a tiny range of millimeters, important parameters such as grouting flow rate, grouting times, and the speed of pipe jacking and pulling will produce relatively significant self-disturbance. Therefore, its refinement degree is crucial for the realization of the construction control target. If the construction process is not properly controlled, the grouting method aimed at reinforcement often causes greater disturbance to the strata, making it impossible to achieve the control indicators. Usually, large-scale micro-disturbance grouting mechanical equipment needs to be used, which limits the construction flexibility and efficiency.

[0006] In summary, it is necessary to design a hydraulic pipe inserter for micro-disturbance grouting reinforcement in the subway tunnel and a grouting process to optimize the deformation repair and reinforcement effect and improve the construction efficiency and equipment flexibility of micro-disturbance grouting in the tunnel. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to propose a new micro-disturbance grouting process in the subway tunnel aiming at the problems of low flexibility and low efficiency of the existing large-scale micro-disturbance grouting mechanical equipment, including the following steps:

[0008] S1. Embedding the orifice pipe:

[0009] S1.1. Embed the orifice pipe at the 5th and 7th positions of the roadbed.

[0010] S1.2. When embedding the grouting orifice pipe, the bonding agent around the orifice pipe should be evenly smeared. When inserting it into the embedded hole, rotate it in one direction to ensure even and dense bonding around the hole, and there is bonding agent overflowing at the orifice.

[0011] S1.3. Drill the hole and embed the orifice pipe on the same day, and install the blanking cover; it is prohibited to drill the hole on the first day and embed the orifice pipe on the second day.

[0012] S2. Pulling out the orifice pipe:

[0013] After an interval of more than 24 hours to ensure that the anchoring glue has solidified to reach the strength, conduct a pull-out test. The pull-out test value shall not be less than 100 KN. Data and photos should be recorded for each hole pull-out.

[0014] S3. Drilling through the segment with a water drill:

[0015] First, connect a ball valve above the orifice pipe, and then connect a blowout preventer above the ball valve. Inject grease into the sealing cavity of the blowout preventer. At this time, both the ball valve and the relief valve of the blowout preventer are in the closed state. The water drill bit passes through the blowout preventer to above the ball valve, tighten the sealing ring of the blowout preventer, open the ball valve switch, and the water drill drills through the segment. If sediment gushes out after penetration, immediately continue to tighten the sealing ring of the blowout preventer until no sediment gushes out. Pull out the water drill bit to above the ball valve, immediately close the ball valve, and then remove all the drill rods and bits of the water drill.

[0016] S4. Insert the pipe and grout:

[0017] S4.1 Assemble the hydraulic pipe inserter, fix it on the roadbed by expansion bolts through the base of the pipe inserter, install the grouting pipe, connect the grouting pipeline, the drill rod passes through the blowout preventer to above the ball valve, tighten the sealing ring, and inject water to observe whether there is leakage in the sealing ring. If there is no leakage, then open the ball valve. At this time, the relief valve is in the closed state.

[0018] S4.2 According to the depth required by the grouting reinforcement design, the clamping device of the pipe inserter clamps the grouting pipe and pushes it downward until it reaches the appropriate depth and prepares for grouting. Before formal grouting, first inject water to flush the grouting channel, observe the pressure at the orifice pipe during water injection. If the pressure is too high, immediately stop grouting. If the pressure is appropriate, then start grouting, pay attention to the slurry ratio and grouting pressure, and the grouting follows the principle of small amount and multiple times. If the pressure is too high during the grouting process, immediately stop grouting and observe the change of the monitoring data in real time.

[0019] S4.3 The vertical hole grouting depth is 0 - 36m of the segment wall thickness. During the grouting process, the drill rod keeps moving up and down, and the grouting is carried out back and forth to prevent the drill rod from being stuck.

[0020] S4.4 The vertical hole grouting is constructed in a one - skip - one sequence.

[0021] ] S4.5 After the grouting is completed, slowly pull out the drill rod to above the ball valve, immediately first close the ball valve, then open the relief valve, and inject water to flush the pipeline. Then remove the blowout preventer and install a blanking cover above the orifice pipe.

[0022] In a preferred embodiment of the present invention, the specific requirements for the embedded orifice pipe at positions 5 and 7 of the roadbed in S1.1 are as follows: the stainless - steel orifice pipe is 38 cm long, with an outer diameter of 60 mm, an inner diameter of 44 mm, and a wall thickness of 8 mm; the opening diameter is 6 cm, the drilling depth is 21 cm, the anchoring depth is 20 cm, and the exposed length is 18 cm.

[0023] Furthermore, before embedding the grouting orifice pipe in S1.2, it is necessary to ensure that all the drill cores in the hole are completely taken out, the hole wall is dry, and there is no water accumulation in the hole.

[0024] Further, in S3, a rhinestone drill bit with a length of 45 cm and a drill pipe with a length of 1 m are used. According to the design requirements of grouting reinforcement, the depth can be extended by connecting pipes. The outer diameter of the rhinestone drill is 36 mm, the inner diameter is 30 mm, and the wall thickness is 3 mm.

[0025] To solve the above problems, the present invention also provides a hydraulic pipe inserter, which includes a pipe inserter base, a pipe inserter bracket, a structure telescopic mechanism, a link structure, a clamping structure, and a telescopic rod structure; the structure telescopic mechanism, the link structure, the clamping structure, and the telescopic rod structure are arranged on the pipe inserter bracket, and the pipe inserter bracket is installed on the pipe inserter base.

[0026] Further, the telescopic rod structure includes a hollow telescopic rod and a telescopic oil cylinder. The middle of the hollow telescopic rod is a hollow structure, and the grouting pipe passes through the middle to form a grouting pipe insertion channel. The hollow telescopic rod is connected to the output end of the telescopic oil cylinder and moves back and forth axially (continuously and uniformly telescoping) under the action of the telescopic oil cylinder; the structure telescopic mechanism includes a clamping oil cylinder and an oil cylinder moving frame. The clamping oil cylinder is sleeved outside the hollow telescopic rod, and its output end is fixedly connected to the oil cylinder moving frame; the link structure includes a link block, a sleeve connection block, and a fixed pressing sleeve. The upper part of the link block is mechanically threadedly connected to the hollow telescopic rod, the lower part of the link block is hermetically connected to the clamping oil cylinder, the sleeve connection block is mechanically threadedly connected to the hollow telescopic rod and the clamping sleeve of the clamping mechanism, and the fixed pressing sleeve is mechanically threadedly connected to the sleeve connection block; the clamping structure includes a clamping sleeve and a sleeve moving block. The lower end of the grouting pipe passing through the hollow telescopic rod passes through the clamping sleeve, and the sleeve moving block is clamped outside the clamping sleeve and is fixedly connected to the oil cylinder moving frame; the lower end of the sleeve connection block is located between the fixed pressing sleeve and the clamping sleeve; the clamping sleeve includes a chuck at the upper part and a tapered sleeve at the lower part. The chuck is inserted into the sleeve connection block, and the outer diameter of the tapered sleeve increases sequentially from top to bottom and is matched with the inner diameter of the sleeve moving block.

[0027] Further, the pipe inserter base includes: left and right plates symmetrically arranged. Semi-circular holes are provided at the centers of one sides of the left and right plates, and fixed anchor bolt holes are provided on the other sides. Ear-shaped connection blocks are fixedly connected to the upper and lower sides of the left and right plates respectively. A link block is fixedly connected to one side of the ear-shaped connection block, and bolt passing holes are reserved at the centers of the link blocks. The link blocks on the left and right plates are arranged in pairs symmetrically and are fixedly connected by passing fastening bolts through the center reserved bolt passing holes.

[0028] Further, the two semi-circular holes are combined to form a reserved grouting hole pipe passing hole; a total of six fixed anchor bolt holes are provided, which are evenly distributed in three on the left and right plates, and the quick-install base of the hydraulic pipe inserter is fixed to the ground through the fixed anchor bolt holes.

[0029] Furthermore, the ear-shaped connection block is vertically and fixedly connected to the left plate or the right plate, with a bolt through-hole reserved in its center, and is connected to the equipment support of the hydraulic pipe inserter through the bolt through-hole; the link block is vertically and fixedly connected to the left plate or the right plate, and is vertically and fixedly connected to the ear-shaped connection block.

[0030] Implementing the present invention has the following beneficial effects:

[0031] The micro-disturbance grouting process in the subway tunnel cavity in this invention, when used in conjunction with the hydraulic pipe inserter, can not only increase the construction operation surface, reduce the deformation of the lining structure, shorten the control settlement repair cycle, but also achieve a more flexible and efficient structural deformation convergence and settlement repair and reinforcement plan.

[0032] The hydraulic pipe inserter for micro-disturbance grouting in the subway tunnel cavity of this invention can automatically clamp the grouting pipe hydraulically to optimize the deformation repair and reinforcement effect and improve the construction efficiency of micro-disturbance grouting in the tunnel cavity. It realizes quick clamping / loosening through the drive of the oil cylinder, significantly shortening the insertion and extraction time of the grouting pipe, and is especially suitable for micro-disturbance grouting scenarios (such as micro-disturbance grouting in the tunnel cavity). The modular threaded connection reduces redundant structures, conforms to the design concept of quick locking of mechanical standard parts, and at the same time realizes mechanical self-locking through the gap control between the sleeve moving block and the clamping sleeve, without the need for additional power to maintain the clamping state.

[0033] The quick-installation base of the hydraulic pipe inserter for micro-disturbance grouting in the subway tunnel cavity of this invention is divided into two symmetric structures. After symmetric assembly, the central hole passes through the grouting pre-buried hole pipe, which can achieve the effect of quick installation and disassembly in a short time, can be stably fixed on the foundation (tunnel bed or segment), reduce the vibration displacement of the drilling and grouting equipment, optimize the micro-disturbance grouting effect in the tunnel cavity, and improve the construction work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic diagram of the grouting process of the hydraulic pipe inserter for micro-disturbance grouting in the subway tunnel cavity provided by the present invention;

[0036] Figure 2 It is a bed position map;

[0037] Figure 3 It is a schematic diagram of the external structure of the hydraulic pipe inserter;

[0038] Figure 4 It is a schematic diagram of the sectional structure of the hydraulic pipe inserter;

[0039] Figure 5 Schematic three-dimensional structure diagram of the base of the pipe inserting machine

[0040] Figure 6 Schematic top view structure diagram of the base of the pipe inserting machine

[0041] In the figure: ball valve 1, blowout preventer 2, hydraulic pipe inserting machine 3, base of the pipe inserting machine 4, expansion bolt 5, grouting pipe 6, pressure relief hole 7, pressure gauge 8, pipe inserting machine support 9, hollow telescopic rod 10, telescopic oil cylinder 11, clamping oil cylinder 12, oil cylinder moving frame 13, link block 14, sleeve connection block 15, fixed compression sleeve 16, clamping sleeve 17, sleeve moving block 18, left plate 19, right plate 20, grouting hole orifice pipe through hole 21, fixed anchor bolt hole 22, ear-shaped connection block 23, bolt through hole 24, link block 25 and bolt through hole 26 Specific implementation mode

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention

[0043] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the grouting process of the micro-disturbance grouting hydraulic pipe inserting machine in the subway tunnel provided by the present invention; the micro-disturbance grouting process in the subway tunnel includes the following steps

[0044] S1. Embedded orifice pipe

[0045] S1.1. The embedded orifice pipe is at the 5th and 7th points of the roadbed. Please refer to Figure 2 , Figure 2 which is a roadbed point diagram; the stainless steel orifice pipe is 38 cm long, with an outer diameter of 60 mm, an inner diameter of 44 mm, and a wall thickness of 8 mm; the opening diameter is 6 cm, the drilling depth is 21 cm, the anchoring depth is 20 cm, and the exposed length is 18 cm

[0046] S1.2. Before embedding the grouting orifice pipe, it is necessary to ensure that the core in the hole is completely removed, the hole wall is dry, and there is no accumulated water in the hole; when embedding the grouting orifice pipe, the planting glue around the orifice pipe should be evenly applied, and it should be inserted along one direction when inserted into the embedded hole to ensure uniform and dense bonding around the hole, and there is planting glue overflowing at the orifice

[0047] S1.3. Drill the hole and embed the orifice pipe on the same day, and install the blank cover; it is prohibited to drill the hole on the first day and embed the orifice pipe on the second day

[0048] S2. Pulling out the orifice pipe:

[0049] After an interval of more than 24 hours to ensure that the anchoring glue has solidified to reach the strength, conduct a pulling test. The pulling test value shall not be less than 100 KN. Data and photo records shall be retained for each hole pulling.

[0050] S3. Drilling through the segment with a water drill:

[0051] Use a water drill bit with a length of 45 cm and a drill rod with a length of 1 m. According to the depth requirements of the grouting reinforcement design, the drill rod can be extended by connecting pipes. The outer diameter of the water drill is 36 mm, the inner diameter is 30 mm, and the wall thickness is 3 mm.

[0052] First, connect the ball valve 1 above the orifice pipe, and then connect the blowout preventer 2 above the ball valve 1. Inject grease into the sealing cavity of the blowout preventer 2. At this time, both the ball valve 1 and the relief valve of the blowout preventer 2 are in the closed state. The water drill bit passes through the blowout preventer 2 to above the ball valve 1, tighten the sealing ring of the blowout preventer 2, open the switch of the ball valve 1, and the water drill drills through the segment. If sediment gushes out after breakthrough, immediately and continuously tighten the sealing ring of the blowout preventer 2 until no sediment gushes out. Pull out the water drill bit to above the ball valve 1, immediately close the ball valve 1, and then take out all the water drill rod and bit.

[0053] S4. Pipe insertion and grouting:

[0054] S4.1 Assemble the hydraulic pipe insertion machine 3, fix it on the roadbed through the base 4 of the pipe insertion machine with expansion bolts 5, install the grouting pipe, connect the grouting pipe 6, the drill rod passes through the blowout preventer 2 to above the ball valve 1, tighten the sealing ring, and inject water to observe whether there is any leakage of the sealing ring. If there is no leakage, then open the ball valve 1. At this time, the relief valve installed on the relief hole 7 is in the closed state.

[0055] S4.2 According to the depth requirements of the grouting reinforcement design, the clamping device of the pipe insertion machine clamps the grouting pipe 6 and pushes it downward until it reaches the appropriate depth, and prepares for grouting. Before formal grouting, first inject water to flush the grouting channel, observe the pressure of the pressure gauge 8 at the orifice pipe during water injection. If the pressure is too high, immediately stop grouting. If the pressure is appropriate, then start grouting, pay attention to the slurry ratio and grouting pressure, and the grouting follows the principle of small quantity and multiple times. If the pressure is too high during the grouting process, immediately stop grouting and observe the change of the monitoring data in real time.

[0056] S4.3 The grouting depth of the vertical hole is 0 - 36 m of the segment wall thickness. During the grouting process, the drill rod keeps moving up and down, and the grouting is carried out back and forth to prevent the drill rod from being stuck.

[0057] S4.4 The vertical hole grouting is constructed in a skip-one sequence.

[0058] After the grouting of S4.5 is completed, slowly pull out the drill pipe to above the ball valve 1, immediately close the ball valve 1 first, then open the pressure relief valve, and flush the pipeline with water; then remove the blowout preventer device and install a blanking cover above the orifice pipe.

[0059] To cooperate with the above grouting process, the present invention also provides a hydraulic pipe inserter, please refer to Figures 3 - 4 , Figure 3 which is a schematic diagram of the external structure of the hydraulic pipe inserter; Figure 4 which is a schematic sectional view of the hydraulic pipe inserter; the hydraulic pipe inserter includes a pipe inserter base 4, a pipe inserter bracket 9, a structure telescoping mechanism, a linking structure, a clamping structure, and a telescopic rod structure; the structure telescoping mechanism, the linking structure, the clamping structure, and the telescopic rod structure are arranged on the pipe inserter bracket 9, and the pipe inserter bracket 9 is installed on the pipe inserter base 4.

[0060] The telescopic rod structure includes a hollow telescopic rod 10 and a telescopic oil cylinder 11. The middle of the hollow telescopic rod 10 is a hollow structure, and the grouting pipe 6 passes through the middle thereof to form a grouting pipe insertion channel. The hollow telescopic rod 10 is connected to the output end of the telescopic oil cylinder 11 and moves back and forth axially (continuously and uniformly telescoping) under the action of the telescopic oil cylinder 11.

[0061] The structure telescoping mechanism includes a clamping oil cylinder 12 and an oil cylinder moving frame 13. The clamping oil cylinder 12 is sleeved outside the hollow telescopic rod 10, and its output end is fixedly connected to the oil cylinder moving frame 13.

[0062] The linking structure includes a linking block 14, a sleeve linking block 15, and a fixed pressing sleeve 16. The upper part of the linking block 14 is mechanically threadedly connected to the hollow telescopic rod 10, the lower part of the linking block 14 is hermetically linked to the clamping oil cylinder 12, the sleeve linking block 15 is mechanically threadedly connected to the hollow telescopic rod 10 and the clamping sleeve 17 of the clamping mechanism, and the fixed pressing sleeve 16 is mechanically threadedly connected to the sleeve linking block 15.

[0063] The clamping structure includes a clamping sleeve 17 and a sleeve moving block 18. The lower end of the grouting pipe 6 passing through the hollow telescopic rod 10 passes through the clamping sleeve 17. The sleeve moving block 18 is clamped outside the clamping sleeve 17 and is fixedly connected to the oil cylinder moving frame 13.

[0064] The lower end of the sleeve linking block 15 is located between the fixed pressing sleeve 16 and the clamping sleeve 17. The clamping sleeve 17 includes a chuck at the upper part and a conical sleeve at the lower part. The chuck is clamped on the sleeve linking block 15, and the outer diameter of the conical sleeve increases sequentially from top to bottom and is matched with the inner diameter of the sleeve moving block 18.

[0065] Specific working principle: The automatic clamping device of the hydraulic pipe inserter for micro-disturbance grouting reinforcement of subway tunnels is composed of core components such as a clamping oil cylinder, a linking block, and a sleeve linking block, and realizes modular assembly through mechanical threaded connection. Its working principle is based on the following linkage mechanism:

[0066] Cylinder telescopic drive: The clamping cylinder drives the sleeve moving block to move axially along the hollow telescopic rod through the cylinder moving frame. When moving upward, the gap between the sleeve moving block and the clamping sleeve increases, and the opening of the clamping sleeve releases the grouting pipe; when moving downward, the gap shrinks, and the clamping sleeve locks the grouting pipe through mechanical deformation. This design is similar to the hydraulic wedge self-locking principle, converting the axial force into a radial clamping force to ensure clamping stability.

[0067] Thread connection and sealing: The mechanical thread connection between the connecting block and the hollow telescopic rod and the clamping cylinder, combined with the sealing structure, not only ensures strength but also prevents hydraulic oil leakage, similar to the self-centering clamping device design of a spring collet.

[0068] Please refer to Figures 5 - 6 , Figure 5 for the three-dimensional structure schematic diagram of the base of the pipe inserter; Figure 6 for the top view structure schematic diagram of the base of the pipe inserter; The base 4 of the pipe inserter includes: the left plate 19 and the right plate 20 which are symmetrically arranged. Semi-circular holes are respectively opened at the centers of one sides of the left plate 19 and the right plate 20, and the two semi-circular holes are combined to form a reserved grouting hole orifice pipe through-hole 21.

[0069] Fixed anchor bolt holes 22 are opened on the other sides of the left plate 19 and the right plate 20. There are a total of six fixed anchor bolt holes 22, which are evenly distributed in three groups on the left plate 19 and the right plate 20 respectively. The base 4 of the pipe inserter is fixed to the ground through the fixed anchor bolt holes 22.

[0070] Ear-shaped connecting blocks 23 are respectively fixedly connected to the upper and lower sides of the left plate 19 and the right plate 20. The ear-shaped connecting blocks 23 are vertically and fixedly connected to the left plate 19 or the right plate 20, and bolt through-holes 24 are reserved at their centers, and are connected to the hydraulic pipe inserter bracket 9 through the bolt through-holes 24.

[0071] A connecting block 25 is fixedly connected to one side of the ear-shaped connecting block 23. The connecting block 25 is vertically and fixedly connected to the left plate 19 or the right plate 20, and is also vertically and fixedly connected to the ear-shaped connecting block 23.

[0072] Bolt through-holes 26 are reserved at the centers of the connecting blocks 25. The connecting blocks 25 on the left plate 19 and the right plate 20 are arranged in pairs symmetrically, and are fixedly connected after the fastening bolts pass through the bolt through-holes 26 reserved at the centers.

[0073] The quick-installation base of the hydraulic pipe inserter for micro-disturbance grouting reinforcement in local subway tunnels is a split symmetric structure: It uses two symmetrically arranged fixed plates, and a complete grouting hole orifice pipe channel is formed by splicing through semi-circular holes in the middle. This design draws on the quick-installation characteristics of the U-shaped base, and at the same time, the split structure is convenient for assembly in narrow spaces and adapts to the irregular surfaces of tunnel beds or segments.

[0074] Customized anchor holes: The diameter of the three anchor holes on each side can be adjusted according to the on-site foundation conditions, similar to the pile-type fixed connection in the foundation plate design, which enhances the bonding strength with the ground and prevents loosening.

[0075] Symmetrical Fastening Structure (Ear-Shaped Connecting Blocks): Bolt-Through Fastening: Four ear-shaped connecting blocks are located on either side of the base, allowing for quick tightening via bolts. This structure, similar to the quick-release principle of a double-base plate clamp, reduces installation deviations through symmetrical force distribution while increasing rigid support strength.

[0076] Reserved through-hole design: Bolt holes are reserved in the middle of the connecting block to facilitate the universality of standardized bolts, meeting the universality requirements of the base bracket of mechanical standard parts.

[0077] Vertical equipment support frame connection structure: Modular link blocks: 4 symmetrically distributed link blocks are connected to the equipment support bracket by bolts. Its design refers to the layered support structure of the derrick base, and disperses vibration loads through multi-point fixation to improve overall stability.

[0078] Anti-vibration optimization: The rigid connection of the link block can effectively reduce the vibration displacement of the equipment, which is consistent with the anti-vibration design concept of the high-speed railway base plate, ensuring the smooth operation of the equipment during the grouting process.

[0079] Technical effect realization mechanism:

[0080] Quick installation and removal:

[0081] Symmetrical assembly: Through the combination of a split fixing plate and ear-shaped connecting blocks, installation only requires aligning the center holes and tightening the bolts. The operation time is short, similar to the modular design logic of the quick-disassembly camera base.

[0082] Standardized bolt interface: All connection points use bolts of uniform specifications, simplifying tool requirements and meeting the installation convenience characteristics of simple screw support.

[0083] Stability and vibration resistance:

[0084] Ground adaptability: The customizable design of the anchor holes allows the fixing method to be adjusted according to the geological conditions of the tunnel bed or segment. Similar to the support mechanism of self-propelled equipment trains, the stability is enhanced by combining primary and auxiliary supports.

[0085] Vibration suppression: The symmetrical structure and multi-point bolt fastening form a rigid frame that effectively absorbs the impact load of the drilling equipment and meets the strength and rigidity requirements of the base bracket of the mechanical standard parts.

[0086] Micro-perturbation grouting optimization:

[0087] Precise positioning of the central hole: The central channel formed by splicing semi-circular holes ensures the perpendicularity of the hole mouth pipe, reduces the deflection disturbance during grouting, similar to the principle of suppressing external interference through structural symmetry in PCB ground layer design.

[0088] Low vibration transmission: The tight fixation of the base to the foundation reduces the vibration transmission rate and improves the grouting uniformity, echoing the smooth control effect of the boarding bridge hydraulic system.

[0089] The quick-install base of the micro-disturbance grouting reinforcement hydraulic insertion machine for subway tunnels realizes the goals of rapid installation, stable support and anti-vibration optimization through a symmetric split structure, modular bolt connection and customized anchor bolt design. Its design concept integrates technologies such as mechanical base stability, quick-disassembly fixture and anti-vibration structure, is applicable to tunnel construction under complex geological conditions, and can significantly improve the operation efficiency and safety.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A micro-disturbance grouting process in a subway tunnel, characterized in that, It includes the following steps: S1. Embedding the orifice pipe: S1.

1. Embed the orifice pipe at positions 5 and 7 of the roadbed. S1.

2. When embedding the grouting orifice pipe, the planting glue around the orifice pipe should be evenly applied. When inserting it into the embedded hole, rotate it in one direction to ensure even and dense bonding around the hole, and there is planting glue overflowing at the orifice. S1.

3. Drill the hole and embed the orifice pipe on the same day, and install the blanking cover. S2. Pulling out the orifice pipe: After an interval of more than 24 hours to ensure that the anchoring glue solidifies to reach the strength, conduct a pulling test. The pulling test value shall not be less than 100 KN. Data and photos should be recorded for each hole during pulling. S3. Drilling through the segment with a water drill: First, connect a ball valve above the orifice pipe, and then connect an anti-spray device above the ball valve. Inject grease into the sealing cavity of the anti-spray device. At this time, both the ball valve and the pressure relief valve of the anti-spray device are in the closed state. The water drill bit passes through the anti-spray device to above the ball valve, tighten the sealing ring of the anti-spray device, open the ball valve switch, and the water drill drills through the segment. If sediment gushes out after penetration, immediately continuously tighten the sealing ring of the anti-spray device until no sediment gushes out. Pull out the water drill bit to above the ball valve, immediately close the ball valve, and then take out all the drill rod and bit of the water drill. S4. Inserting the pipe and grouting: S4.1 Assemble the hydraulic pipe inserter. Fix the pipe inserter base on the roadbed with expansion bolts, install the grouting pipe, connect the grouting pipeline, and the drill rod passes through the anti-spray device to above the ball valve. Tighten the sealing ring and inject water to observe whether there is any leakage of the sealing ring. If there is no leakage, then open the ball valve. At this time, the pressure relief valve is in the closed state. S4.2 According to the depth required by the grouting reinforcement design, the clamping device of the pipe inserter clamps the grouting pipe and pushes it downward until it reaches an appropriate depth, and prepares for grouting. S4.3 The grouting depth of the vertical hole is 0 - 36 m of the segment wall thickness. During the grouting process, the drill rod keeps moving up and down, and the grouting is carried out back and forth to prevent the drill rod from being stuck. S4.4 The vertical hole grouting is constructed in a one-skip-one sequence. S4.5 After the grouting is completed, slowly pull out the drill rod to above the ball valve. Immediately close the ball valve first, then open the pressure relief valve, and inject water to wash the pipeline. Then remove the anti-spray device and install a blanking cover above the orifice pipe.

2. The micro-disturbance grouting process in the subway tunnel according to claim 1, wherein The specific requirements for embedding the orifice pipe at positions 5 and 7 of the roadbed in S1.1 are as follows: The stainless steel orifice pipe is 38 cm long, with an outer diameter of 60 mm, an inner diameter of 44 mm, and a wall thickness of 8 mm; the opening diameter is 6 cm, the drilling depth is 21 cm, the anchoring depth is 20 cm, and the exposed length is 18 cm.

3. The micro-disturbance grouting process in the subway tunnel cavity according to claim 2, characterized in that, Before embedding the grouting orifice pipe in S1.2, it is necessary to ensure that the core in the hole is completely removed, the hole wall is dry, and there is no water accumulation in the hole.

4. The micro-disturbance grouting process in the subway tunnel according to claim 3, characterized in that, In S3, the water drill bit is 45 cm long, with an outer diameter of 36 mm, an inner diameter of 30 mm, and a wall thickness of 3 mm.

5. The micro-disturbance grouting process in the subway tunnel cavity according to claim 1, characterized in that, The hydraulic pipe inserter includes a pipe inserter base, a pipe inserter bracket, a structure telescopic mechanism, a linking structure, a clamping structure, and a telescopic rod structure; the structure telescopic mechanism, the linking structure, the clamping structure, and the telescopic rod structure are arranged on the pipe inserter bracket, and the pipe inserter bracket is installed on the pipe inserter base.

6. The micro-disturbance grouting process in the subway tunnel cavity according to claim 5, characterized in that, The telescopic rod structure includes a hollow telescopic rod and a telescopic oil cylinder. The middle of the hollow telescopic rod is a hollow structure, and a grouting pipe passes through the middle thereof to form a grouting pipe insertion channel. The hollow telescopic rod is connected to the output end of the telescopic oil cylinder and reciprocates axially under the action of the telescopic oil cylinder. The structure telescopic mechanism includes a clamping oil cylinder and an oil cylinder moving frame. The clamping oil cylinder is sleeved outside the hollow telescopic rod, and its output end is fixedly connected to the oil cylinder moving frame. The linking structure includes a linking block, a sleeve linking block, and a fixed pressing sleeve. The upper part of the linking block is mechanically thread-connected to the hollow telescopic rod, and the lower part of the linking block is hermetically linked to the clamping oil cylinder. The sleeve linking block is mechanically thread-connected to the hollow telescopic rod and the clamping sleeve of the clamping mechanism. The fixed pressing sleeve is mechanically thread-connected to the sleeve linking block. The clamping structure includes a clamping sleeve and a sleeve moving block. The lower end of the grouting pipe passing through the hollow telescopic rod passes through the clamping sleeve. The sleeve moving block is clamped outside the clamping sleeve and is fixedly connected to the oil cylinder moving frame. The lower end of the sleeve linking block is located between the fixed pressing sleeve and the clamping sleeve. The clamping sleeve includes a chuck at the upper part and a conical sleeve at the lower part. The chuck is inserted into the sleeve linking block, and the outer diameter of the conical sleeve increases sequentially from top to bottom and is matched with the inner diameter of the sleeve moving block.

7. The micro-disturbance grouting process in the subway tunnel cavity according to claim 6, characterized in that The base of the inserting machine includes symmetrically arranged left and right plates. A semi-circular hole is provided at the center of one side of each of the left and right plates, and a fixed anchor bolt hole is provided on the other side. Ear-shaped connecting blocks are fixedly connected to the upper and lower sides of the left and right plates respectively. A linking block is fixedly connected to one side of the ear-shaped connecting block. A bolt pair through hole is reserved at the center of each linking block. The linking blocks on the left and right plates are arranged in two-by-two parallel symmetry and are fixedly connected by passing a fastening bolt through the reserved bolt pair through hole at the center.

8. The quick-installation base of the hydraulic pipe inserter according to claim 7, characterized in that, The two semi-circular holes are combined to form a reserved grouting hole opening pipe through hole. There are a total of six fixed anchor bolt holes, which are evenly distributed in three on each of the left and right plates. The quick-install base of the hydraulic inserting machine is fixed to the ground through the fixed anchor bolt holes.

9. The quick-installation base of the hydraulic pipe inserter according to claim 8, characterized in that, The ear-shaped connecting block is vertically and fixedly connected to the left or right plate, and a bolt pair through through hole is reserved at its center and is connected to the hydraulic inserting machine bracket through the bolt pair through through hole. The linking block is vertically and fixedly connected to the left or right plate and is vertically and fixedly connected to the ear-shaped connecting block.

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