A method for shield construction of a connection passage

Abstract

The application belongs to the technical field of connecting passages, and particularly relates to a connecting passage shield construction method, which is characterized by comprising a crawler chassis, a motor, a vertical arm, a welding rod and an electric arc welding machine; after the main tunnel segment is spliced and installed at the segment splicing installation position of the tunnel portal, the crawler chassis is moved to the tunnel portal, the welding rod is installed at the top of the vertical arm, the welding rod is connected with the positive electrode of the electric arc welding machine, the negative electrode of the electric arc welding machine is connected with the to-be-welded segment, and the electric arc welding machine is grounded at the same time; the motor drives the vertical arm to rotate, the welding rod slides through the to-be-welded position of the segment, and the segments are welded and fixed, so that the staff can weld the top segment without using a scaffold, the working difficulty of the staff is reduced, the working efficiency of the staff is improved, and the safety during work is improved.

Description

Technical Field

[0001] This invention belongs to the field of communication channel technology, specifically a method for tunnel boring machine (TBM) construction of communication channels. Background Technology

[0002] A connecting passage is a channel located between two tunnels, serving functions such as connection, drainage, and fire prevention. In the event of a problem in one tunnel, personnel can be transferred to the other tunnel through the connecting passage, greatly improving personnel safety. At the same time, it also facilitates rescue personnel to enter the area requiring rescue from the other tunnel through the connecting passage when a problem occurs in one tunnel, achieving the goal of rapid rescue.

[0003] A Chinese patent with publication number CN109869159B discloses a shield tunneling method for a connecting passage. At the starting end, multiple holes are drilled circumferentially in the area corresponding to the connecting passage to be constructed, penetrating the main tunnel segments at the starting end, the stratum where the connecting passage is located, and the main tunnel segments at the receiving end, to thread steel cables. A traction mechanism is installed at the receiving end, and the two ends of the multiple steel cables are connected to the shield shell of the shield machine at the starting end and the traction mechanism at the receiving end, respectively. This allows the traction mechanism to pull the shield machine forward through the steel cables. Furthermore, without pausing the shield machine's excavation, the segment rings and extended shield shell can be assembled sequentially until the connecting passage is completed, forming an extended shield shell and connecting passage segment rings extending from the starting end to the receiving end. This method significantly shortens construction time, improves construction efficiency, reduces construction costs, minimizes ground disturbance, and prevents construction risks such as surface subsidence and excavation collapse.

[0004] When welding the steel structure of the main tunnel segments at the launching and receiving portals, workers need to erect scaffolding for manual welding. Welding from above not only increases the difficulty of welding the filter holes but also increases the danger of the welding process. At the same time, as the construction progresses, workers need to constantly dismantle and move the scaffolding, which greatly increases their workload.

[0005] Therefore, the present invention provides a method for tunneling construction of a connecting passage. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is: a shield tunneling construction method for a connecting passage, the construction method comprising the following steps:

[0008] S1: Equipment Assembly. The various sections of the tunnel boring machine (TBM) are connected by connecting rods and pins. The wheels, cylinder columns, and receiving / launching sleeves of the starting and receiving ends (TBMs #3 and #5) need to be installed on the ground. After being lowered into the shaft, the front and rear supports and top supports are installed. Then, the machine is pulled into the designated location inside the tunnel by a battery-powered vehicle for equipment pipeline connections and related debugging. Similar to traditional tunnel boring machines (TBMs), the TBM consists of a cutterhead system, drive system, muck conveying system, rear support system, propulsion system, segment assembly system, foam system, circulating water system, industrial air system, hydraulic system, guiding system, PLC control system, and data acquisition system. The launching and receiving steel sleeves and the launching reaction system are all integrated on the TBM to achieve the entire process of launching, tunneling, and receiving the TBM within a confined space. The workflow is similar to that of a traditional TBM: the cutterhead cuts the soil, the soil is discharged by a screw conveyor, and then transported by a hopper to a muck truck for transport outside the tunnel. The tunnel segments are transported into the tunnel by battery-powered vehicles and then assembled by the segment assembly system; the tunneling of the connecting passage is completed through the coordinated operation of various systems of the tunneling machine.

[0009] S2: Tunnel layout. Due to the limited space inside the tunnel, water pipes and walkway slabs are arranged in the track area. The walkway slabs are not equipped with handrail supports. LED light strips are used for lighting. The high-voltage cables inside the tunnel are suspended by cable hooks after being transported to the designated position by the tunneling machine.

[0010] S3: Secondary grouting. Before the start of the grouting, the front and rear three rings of the left and right lines of the connecting channel are grouted again to ensure the grouting effect.

[0011] S4: Portal steel segment processing: The steel structure of the six segments at the starting and receiving portals of the main tunnel is welded together into a whole using a welding device. The welding is done in multiple layers, with each layer having a thickness of 3-5mm.

[0012] S5: Installation of the launching sleeve and reaction frame. There is a 65mm gap between the tunneling machine main unit and the launching sleeve. After the main unit enters the tunnel, there is a 135mm gap between the connecting passage segment and the launching sleeve. Three wire brushes + shield tail grease are used for sealing to ensure temporary sealing of the interface during launching. The reaction frame is placed inside the main unit on the ground. After the trolley support system is loaded, the reaction frame is pushed out onto the rear support system and welded for reinforcement. Before launching, the sleeve needs to be filled with a filling medium for sealing and pressure maintenance. The filling medium is usually bentonite material, and the pressure value is set at about 1.5Mpa. Bentonite can disperse in water as a colloidal suspension. This suspension has certain viscosity, thixotropy and lubricity. It has plasticity and adhesion when mixed with water, mud, sand and other fine debris. During bentonite hydration, sodium ions connect the thin layers and simultaneously fill the gaps between soil particles in contact with it, accumulating at the contact surface between the soil and muddy water to form an impermeable plastic colloid, thus forming a mud film. When used in tunnel boring machines excavating through water-rich gravel layers, it can increase the mud content of the gravel, replenish the fine-particle components of the soil, reduce the internal friction angle of the soil, and increase the fluidity and impermeability of the excavated soil.

[0013] S6: Excavation and excavation of soil and assembly of tunnel segments; pushing the excavated soil into the main tunnel, then transporting it out by main tunnel dump trucks; lifting it out by crane at the shaft opening; storing the excavated soil in a soil collection box; and then arranging for dump trucks to remove the soil; assembling tunnel segments according to design requirements; pre-fitting a theoretical layout diagram for tunnel segment assembly and formulating corresponding layout and correction principles to guide subsequent tunnel segment assembly construction; using a general-purpose lining ring, with the entire ring divided into 5 pieces, staggered assembly, and wedge-shaped amount calculated based on R=200m; concrete strength grade C50, impermeability grade P10. This lining ring consists of one capping block (F)G / X, two adjacent blocks (L / 1)G / X and (L / 2)G / X, and two standard blocks (B / 1)G / X and (B / 2)G / X. When assembling the prefabricated reinforced concrete lining ring, the capping blocks are first overlapped by 450mm, pushed radially upwards, and then inserted longitudinally. The inner arc surface of each lining block must be clearly marked with a block number that will not be worn away, such as (F)G / X, (L / 1)G / X, (L / 2)G / X…; X = 1, 2, 3, 4 are the burial depth markings. Afterwards, grouting is carried out behind the tunnel wall. Since no synchronous grouting pipeline is set up at the tail of the shield, a dual-liquid grouting pump is set up on the No. 4 trolley to fill the drag-reducing gap behind the tunnel segment wall. Cement-water glass grout is manually injected through the grouting holes reserved in the tunnel segment. There are 4 injection points, and the pressure is controlled at 0.4-0.5 MPa. The injection position is 4 rings behind the current ring. After the shield is received and the portal interface is installed, a second grouting should be carried out after the excavation is completed to fill the gaps caused by grout shrinkage and seal the leakage points. The grout used is cement-water glass dual-liquid grout.

[0014] S7: Segment weakening treatment. After the receiving sleeve is welded, based on the experience of the previous two connecting channels and the current construction period of the connecting channel, it is necessary to shorten the segment cutting time. The strength of the portal concrete structure is weakened by drilling. The drilling diameter is 80mm, the drilling depth is 150-175mm, the drilling spacing is 120*120mm, and the holes are evenly arranged horizontally and vertically. The horizontal and vertical borehole position deviations must be controlled within ±10mm; the drilling sequence follows the order in which the cutterhead cuts the tunnel segments; the cutterhead first grinds through the center of the segment, then cuts outwards in an elliptical pattern from the center to ensure rapid entry and exit of the cutterhead during launch or reception, thus maintaining soil stability; the segment cutting section is divided into three areas for weakening treatment; in the first area, core sampling is performed centered on the portal center, in a 1.2×0.92m area, with a total of 88 cores taken; in the second area, core sampling is performed in the elliptical trajectory area, with a total of 320 cores taken; in the third area, the final part of the cutterhead cutting is performed, with core sampling at the top and bottom, with a total of 117 cores taken. The depth of each core sample is between 150mm and 175mm, and the borehole diameter is [not specified]. A total of 525 segments were taken from the three areas. After the segments were cored, quick-drying cement was used to seal the core holes.

[0015] S8: Receiving steel sleeve installation. The receiving steel sleeve is divided into four sections, of which the front end, extension ring and rear end are integral rings, and the middle section is divided into upper and lower semicircles; the cylinder material is 30mm thick Q235 steel plate. The outer periphery of each cylinder section is welded with longitudinal and circumferential stiffeners to ensure the rigidity of the cylinder. The stiffeners are 20mm thick, 45mm high, and spaced at approximately 300×350mm intervals. Flanges are welded to the mating surfaces of each section. The flanges are made of 30mm thick Q235 plate and are connected with 10.9 grade M20 bolts with O-ring sealing strips in the middle.

[0016] S9: Steel sleeve filling. When the cutterhead is 500mm away from the receiving end segment, stop tunneling. After the steel sleeve is assembled, begin filling. The filling material is mortar, which is pumped into the steel sleeve using a squeeze pump. The inlet is located at the discharge port directly above the second segment of the steel sleeve. The mortar is commercial mortar, transported from a surface funnel or truck-mounted pump to a mortar transfer truck at the wellhead, and then pumped into the tunnel using a squeeze pump to the top grouting hole of the steel sleeve until it is completely filled. After the initial filling of the steel sleeve, open the two pre-reserved pressure relief ports on the steel sleeve, connect the top pressure relief port to the grouting pipe, and use a high-speed automatic grouting trolley to add mud and pressurize. The pressurized grouting pressure is 0.35Mpa, and the grout is bentonite grout. Closely monitor the pressure inside the sleeve before injection. For the receiving sleeve, observe the pressure inside the sleeve. Ensure it is not less than 0.25 MPa and maintain this pressure for 30 minutes without leakage. The pressure loss should not exceed 0.05 MPa. The receiving sleeve sealing test is then complete. If leakage occurs, immediately organize sealing and continue the pressure holding test until the pressure matches the soil pressure of the surrounding strata, meeting the requirements. After the sealing test, closely monitor pressure changes inside the sleeve and assign dedicated personnel to monitor it. When the pressure inside the sleeve is less than 0.27 MPa, immediately organize grout mixing and replenish the pressure to 0.35 MPa before stopping. Before the cutterhead cuts the segments, prepare for pressure holding grouting. During the cutterhead cutting process, closely monitor pressure changes in the receiving sleeve. When the pressure is less than 0.27 MPa, immediately organize grout replenishment.

[0017] S10: Tunnel Boring Machine (TBM) Reception. Before the TBM arrives, the distance at which the TBM cutterhead will collide with the concrete segments is calculated through actual measurements. Simultaneously, ground settlement is monitored. The TBM enters the tunneling state upon reaching this distance, with ground settlement monitored every two hours. Based on the monitoring data, measures such as grouting are taken. Pre-cutting segment advance parameter settings: Before the TBM cutterhead contacts the concrete segments, attention must be paid to the selection of TBM tunneling parameters to prevent excessive correction and to ensure a good shield posture when the TBM hits the wall through correct segment selection. Segment cutting advance parameter settings: Pushing speed less than 10mm / min. The thrust should be less than 4000kN; the cutterhead speed should be 1.5-2.0rpm. During actual operation, the thrust should be adjusted according to the torque changes to control the torque to less than 800kNm. To prevent the shield machine head from being carried out of the tunnel, the shield machine head should be 3-5cm higher than the axis, in a slightly upward posture. The horizontal posture should be within ±20mm. The foam injection pipeline should be reconnected to the modified injection pump to inject modified material and modified slag during the cutting of the tunnel segments. The tunneling parameters inside the steel sleeve should be set so that after the positive ring is advanced, the shield machine has not yet fully entered the sleeve and needs to continue to advance to assemble the negative ring. When the cutter tip is about to resist the end of the sleeve, the reception is considered complete.

[0018] Preferably, the welding device in S includes a tracked chassis, a motor, a semi-circular seat, a vertical arm, and a welding rod; the semi-circular seat is fixedly connected to the top surface of the tracked chassis, a slot is formed in the middle of the semi-circular seat, and the vertical arm is rotatably mounted inside the slot; the motor is fixedly connected to the top surface of the tracked chassis, the motor shaft rotates through the side wall of the slot, the motor shaft is fixedly connected to the bottom of the vertical arm, and a welding rod is provided at the top of the vertical arm; the welding rod is connected to the positive electrode of an arc welding machine via an electric wire; the negative electrode of the arc welding machine is connected to the steel structure part of the pipe segment via an electric wire, and both the negative electrode of the arc welding machine and the steel structure part of the pipe segment are connected. During operation, after the main tunnel segments are spliced ​​and installed at the starting and receiving portals, the tracked chassis moves along the connecting passage to the portal, installs welding rods on the top of the vertical arm, connects the welding rods to the positive electrode of the arc welding machine, connects the negative electrode of the arc welding machine to the segment to be welded, and simultaneously grounds it; the motor drives the vertical arm to rotate along the groove of the semi-circular seat, causing the welding rods to slide over the segment to be welded, welding and fixing the segments together. This allows workers to perform welding work on the top segments without the need for scaffolding, reducing the difficulty of the work, improving the work efficiency, and enhancing the safety of the work.

[0019] Preferably, a vertical groove is formed at the center of the top of the vertical arm, and a sliding arm is slidably installed inside the vertical groove. A hydraulic cylinder is fixedly connected to the bottom of the vertical groove, and the top of the piston rod of the hydraulic cylinder is fixedly connected to the bottom end of the sliding arm. A ring block is fixedly connected to the outer ring of the middle of the vertical groove, and the inner ring of the ring block is fitted around the outer ring of the piston rod of the hydraulic cylinder. The top surface of the ring block is located at the bottom of the sliding arm. During operation, the hydraulic cylinder pushes the sliding arm to slide out from the vertical groove inside the vertical arm, and the sliding arm pushes the welding rod to contact the welding position of the pipe segment. The welding height range of the welding rod is controlled by the hydraulic cylinder, which facilitates the welding of pipe segments of different heights by the operator, thereby improving the applicability of the welding device. The ring block blocks the descent distance of the sliding arm, reducing the probability of the sliding arm hitting the hydraulic cylinder, thereby improving the safety of the hydraulic cylinder.

[0020] Preferably, support wheels are rotatably mounted on both sides of the bottom of the vertical arm. The inner ring of the support wheel is fitted around the outer ring of the motor shaft. The outer wall of the support wheel slides in contact with the top surface of the track chassis. Arc-shaped grooves are formed on both sides of the slot. Arc-shaped sliders are fixedly connected to both sides of the vertical arm. The outer wall of the arc-shaped slider slides in contact with the inner wall of the arc-shaped groove. Limiting sliders are slidably mounted on both sides of the arc-shaped groove. The outer wall of the limiting slider slides in contact with the inner wall of the arc-shaped groove. A spring is fixedly connected between the bottom of the limiting slider and the bottom end of the arc-shaped groove. When the motor drives the vertical arm to rotate, the vertical arm drives the support wheel to slide along the inside of the groove, while simultaneously sliding against the top surface of the tracked chassis. The support wheel supports the vertical arm, reducing the probability of vertical arm vibration and thus improving welding stability. When the vertical arm rotates, it drives the arc-shaped slider to slide along the arc-shaped groove, causing the arc-shaped slider to push the limit slider to slide, which compresses the No. 1 spring. When the limit slider slides to the bottom, it stops the vertical arm from continuing to rotate, thereby reducing the probability of the vertical arm hitting the side wall of the tracked chassis and causing danger, and further improving the safety of the welding device.

[0021] Preferably, the inner and outer rings of the limiting slider are provided with multiple circular grooves, and a roller is rotatably installed inside the circular groove. The outer wall of the roller slides in cooperation with the inner wall of the arc-shaped groove. During operation, when the arc-shaped slider slides along the arc-shaped groove, it drives the roller to rotate in the circular groove, which reduces the friction between the limiting slider and the arc-shaped groove, thereby improving the smoothness of the limiting slider's sliding and thus improving the stability and smoothness of the vertical arm's rotation.

[0022] Preferably, a fixed seat is fixedly connected to the top of the sliding arm, and an installation groove is formed in the middle of the top surface of the fixed seat. Multiple elastic clips are fixedly connected around the bottom surface of the installation groove, and the welding rod is clamped in the middle of the multiple elastic clips. A cup-shaped rubber sleeve is fixedly connected to the outer ring of the top surface of the fixed seat. During operation, the welding rod is inserted between the elastic clips, and the elastic force of the elastic clips clamps and fixes the welding rod. After the sliding arm pushes the fixed seat close to the welding position of the pipe segment, it pushes the cup-shaped rubber sleeve to wrap around the welding position of the pipe segment. The welding rod is welded in the inner ring of the cup-shaped rubber sleeve. The welding slag during welding falls into the inside of the cup-shaped rubber sleeve, reducing the probability of welding slag falling, thus making it easier for the operator to observe and operate from below.

[0023] Preferably, the elastic clamp has multiple protrusions fixed to the side near the welding rod, and the outer wall of the protrusions slides in engagement with the outer wall of the welding rod. The outer ring of the mounting groove has multiple inner cavities, and clamping blocks are slidably installed in the inner cavities. A rubber pad is fixed to the side of the clamping block near the elastic clamp, and the outer wall of the rubber pad slides in engagement with the outer wall of the elastic clamp. A second spring is fixed between the inner cavity and the clamping block. During operation, the protrusions increase the friction between the elastic clamp and the welding rod, thereby improving the clamping firmness of the elastic clamp. The elastic force of the second spring pushes the clamping block out of the inner cavity, pushing the rubber pad to pressurize the elastic clamp, thereby further improving the clamping force of the elastic clamp on the welding rod. The rubber material of the rubber pad effectively provides insulation, reducing the probability of leakage during welding.

[0024] Preferably, a rubber ring plate is fixedly connected to the bottom of the inner ring of the bowl-shaped rubber sleeve. The inner ring of the rubber ring plate is fitted around the outer ring of the welding rod. Multiple rubber sheets are fixedly connected around the inner ring of the rubber ring plate. The outer wall of the rubber sheets slides in fit with the outer wall of the welding rod. During operation, the installation groove is blocked by the cooperation of the rubber ring plate and the rubber sheets. The welding debris during welding falls onto the top surface of the rubber ring plate, reducing the probability of welding debris falling into the installation groove, thereby reducing the probability of leakage during welding.

[0025] Preferably, the outer ring of the cup-shaped rubber sleeve is fixedly connected to the top of multiple inserts, and a universal wheel is rotatably mounted on the top of each insert. The outer ring of the universal wheel is provided with multiple protrusions. During operation, after the sliding arm pushes the fixed seat close to the welding position of the pipe segment, the universal wheel contacts the bottom surface of the pipe segment. When the welding rod is used for welding, the track chassis moves, which drives the fixed seat to move, causing the universal wheel to move. The protrusions increase the friction between the universal wheel and the pipe segment, reduce the probability of the universal wheel slipping, and reduce the friction between the cup-shaped rubber sleeve and the pipe segment. This reduces the probability of the cup-shaped rubber sleeve deforming due to friction, and consequently reduces the impact of the cup-shaped rubber sleeve on the welding rod.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. The present invention discloses a method for tunnel boring machine (TBM) construction of a connecting passage. This method involves setting up a tracked chassis, a motor, a vertical boom, welding rods, and an arc welding machine. After the main tunnel segments are spliced ​​and installed at the launching and receiving portals, the tracked chassis moves along the connecting passage to the portal. Welding rods are then installed on the top of the vertical boom, connected to the positive electrode of the arc welding machine, and the negative electrode of the arc welding machine is connected to the segment to be welded, while simultaneously grounding. The motor drives the vertical boom to rotate, causing the welding rods to slide across the segment to be welded, thus welding and fixing the segments together. This method allows workers to weld the top segments without the need for scaffolding, reducing the difficulty of the work, improving work efficiency, and enhancing safety.

[0028] 2. The shield tunneling construction method for a connecting passage described in this invention involves setting up a fixed seat, elastic clamps, and a cup-shaped rubber sleeve. A welding rod is inserted between the elastic clamps, and the elastic force of the clamps clamps and fixes the welding rod. After the sliding arm pushes the fixed seat close to the welding position of the tunnel segment, it pushes the cup-shaped rubber sleeve to wrap around the welding position of the tunnel segment. The welding rod welds inside the cup-shaped rubber sleeve, and the welding debris falls into the inside of the cup-shaped rubber sleeve, reducing the probability of welding debris falling out and making it easier for workers to observe and operate from below. Attached Figure Description

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0031] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention;

[0032] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle;

[0033] Figure 4 yes Figure 2 Enlarged view of a section at point B in the middle;

[0034] Figure 5 yes Figure 2 Enlarged view of a section at point C;

[0035] Figure 6 This is a cross-sectional view of the fixing seat according to Embodiment 2 of the present invention;

[0036] Figure 7 This is a flowchart of the construction method of the present invention;

[0037] In the diagram: 1. Tracked chassis; 2. Motor; 3. Semi-circular seat; 4. Vertical arm; 5. Welding rod; 6. Groove; 7. Arc welding machine; 8. Vertical groove; 9. Sliding arm; 10. Hydraulic cylinder; 11. Ring block; 12. Support wheel; 13. Arc-shaped sliding groove; 14. Arc-shaped slider; 15. Limiting slider; 16. Spring No. 1; 17. Circular groove; 18. Roller; 19. Fixed seat; 20. Mounting groove; 21. Elastic clamp; 22. Bowl-shaped rubber sleeve; 23. Protrusion; 24. Inner cavity; 25. Clamping block; 26. Rubber pad; 27. Spring No. 2; 28. Rubber ring plate; 29. ​​Rubber sheet; 30. Inlay; 31. Universal wheel; 32. Protrusion; 33. Circular plate. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0039] Example 1

[0040] like Figure 7 As shown in the embodiment of the present invention, a method for constructing a tunnel boring machine for a connecting passage includes the following steps:

[0041] S1: Equipment Assembly. The various sections of the tunnel boring machine (TBM) are connected by connecting rods and pins. The wheels, cylinder columns, and receiving / launching sleeves of the starting and receiving ends (TBMs #3 and #5) need to be installed on the ground. After being lowered into the shaft, the front and rear supports and top supports are installed. Then, the machine is pulled into the designated location inside the tunnel by a battery-powered vehicle for equipment pipeline connections and related debugging. Similar to traditional tunnel boring machines (TBMs), the TBM consists of a cutterhead system, drive system, muck conveying system, rear support system, propulsion system, segment assembly system, foam system, circulating water system, industrial air system, hydraulic system, guiding system, PLC control system, and data acquisition system. The launching and receiving steel sleeves and the launching reaction system are all integrated on the TBM to achieve the entire process of launching, tunneling, and receiving the TBM within a confined space. The workflow is similar to that of a traditional TBM: the cutterhead cuts the soil, the soil is discharged by a screw conveyor, and then transported by a hopper to a muck truck for transport outside the tunnel. The tunnel segments are transported into the tunnel by battery-powered vehicles and then assembled by the segment assembly system; the tunneling of the connecting passage is completed through the coordinated operation of various systems of the tunneling machine.

[0042] S2: Tunnel layout. Due to the limited space inside the tunnel, water pipes and walkway slabs are arranged in the track area. The walkway slabs are not equipped with handrail supports. LED light strips are used for lighting. The high-voltage cables inside the tunnel are suspended by cable hooks after being transported to the designated position by the tunneling machine.

[0043] S3: Secondary grouting. Before the start of the grouting, the front and rear three rings of the left and right lines of the connecting channel are grouted again to ensure the grouting effect.

[0044] S4: Portal steel segment processing: The steel structure of the six segments at the starting and receiving portals of the main tunnel is welded together into a whole using a welding device. The welding is done in multiple layers, with each layer having a thickness of 3-5mm.

[0045] S5: Installation of the launching sleeve and reaction frame. There is a 65mm gap between the tunneling machine main unit and the launching sleeve. After the main unit enters the tunnel, there is a 135mm gap between the connecting passage segment and the launching sleeve. Three wire brushes + shield tail grease are used for sealing to ensure temporary sealing of the interface during launching. The reaction frame is placed inside the main unit on the ground. After the trolley support system is loaded, the reaction frame is pushed out onto the rear support system and welded for reinforcement. Before launching, the sleeve needs to be filled with a filling medium for sealing and pressure maintenance. The filling medium is usually bentonite material, and the pressure value is set at about 1.5Mpa. Bentonite can disperse in water as a colloidal suspension. This suspension has certain viscosity, thixotropy and lubricity. It has plasticity and adhesion when mixed with water, mud, sand and other fine debris. During bentonite hydration, sodium ions connect the thin layers and simultaneously fill the gaps between soil particles in contact with it, accumulating at the contact surface between the soil and muddy water to form an impermeable plastic colloid, thus forming a mud film. When used in tunnel boring machines excavating through water-rich gravel layers, it can increase the mud content of the gravel, replenish the fine-particle components of the soil, reduce the internal friction angle of the soil, and increase the fluidity and impermeability of the excavated soil.

[0046] S6: Excavation and excavation of soil and assembly of tunnel segments; pushing the excavated soil into the main tunnel, then transporting it out by main tunnel dump trucks; lifting it out by crane at the shaft opening; storing the excavated soil in a soil collection box; and then arranging for dump trucks to remove the soil; assembling tunnel segments according to design requirements; pre-fitting a theoretical layout diagram for tunnel segment assembly and formulating corresponding layout and correction principles to guide subsequent tunnel segment assembly construction; using a general-purpose lining ring, with the entire ring divided into 5 pieces, staggered assembly, and wedge-shaped amount calculated based on R=200m; concrete strength grade C50, impermeability grade P10. This lining ring consists of one capping block (F)G / X, two adjacent blocks (L / 1)G / X and (L / 2)G / X, and two standard blocks (B / 1)G / X and (B / 2)G / X. When assembling the prefabricated reinforced concrete lining ring, the capping blocks are first overlapped by 450mm, pushed radially upwards, and then inserted longitudinally. The inner arc surface of each lining block must be clearly marked with a block number that will not be worn away, such as (F)G / X, (L / 1)G / X, (L / 2)G / X…; X = 1, 2, 3, 4 are the burial depth markings. Afterwards, grouting is carried out behind the tunnel wall. Since no synchronous grouting pipeline is set up at the tail of the shield, a dual-liquid grouting pump is set up on the No. 4 trolley to fill the drag-reducing gap behind the tunnel segment wall. Cement-water glass grout is manually injected through the grouting holes reserved in the tunnel segment. There are 4 injection points, and the pressure is controlled at 0.4-0.5 MPa. The injection position is 4 rings behind the current ring. After the shield is received and the portal interface is installed, a second grouting should be carried out after the excavation is completed to fill the gaps caused by grout shrinkage and seal the leakage points. The grout used is cement-water glass dual-liquid grout.

[0047] S7: Segment weakening treatment. After the receiving sleeve is welded, based on the experience of the previous two connecting channels and the current construction period of the connecting channel, it is necessary to shorten the segment cutting time. The strength of the portal concrete structure is weakened by drilling. The drilling diameter is 80mm, the drilling depth is 150-175mm, the drilling spacing is 120*120mm, and the holes are evenly arranged horizontally and vertically. The horizontal and vertical borehole position deviations must be controlled within ±10mm; the drilling sequence follows the order in which the cutterhead cuts the tunnel segments; the cutterhead first grinds through the center of the segment, then cuts outwards in an elliptical pattern from the center to ensure rapid entry and exit of the cutterhead during launch or reception, thus maintaining soil stability; the segment cutting section is divided into three areas for weakening treatment; in the first area, core sampling is performed centered on the portal center, in a 1.2×0.92m area, with a total of 88 cores taken; in the second area, core sampling is performed in the elliptical trajectory area, with a total of 320 cores taken; in the third area, the final part of the cutterhead cutting is performed, with core sampling at the top and bottom, with a total of 117 cores taken. The depth of each core sample is between 150mm and 175mm, and the borehole diameter is [not specified]. A total of 525 segments were taken from the three areas. After the segments were cored, quick-drying cement was used to seal the core holes.

[0048] S8: Receiving steel sleeve installation. The receiving steel sleeve is divided into four sections, of which the front end, extension ring and rear end are integral rings, and the middle section is divided into upper and lower semicircles; the cylinder material is 30mm thick Q235 steel plate. The outer periphery of each cylinder section is welded with longitudinal and circumferential stiffeners to ensure the rigidity of the cylinder. The stiffeners are 20mm thick, 45mm high, and spaced at approximately 300×350mm intervals. Flanges are welded to the mating surfaces of each section. The flanges are made of 30mm thick Q235 plate and are connected with 10.9 grade M20 bolts with O-ring sealing strips in the middle.

[0049] S9: Steel sleeve filling. When the cutterhead is 500mm away from the receiving end segment, stop tunneling. After the steel sleeve is assembled, begin filling. The filling material is mortar, which is pumped into the steel sleeve using a squeeze pump. The inlet is located at the discharge port directly above the second segment of the steel sleeve. The mortar is commercial mortar, transported from a surface funnel or truck-mounted pump to a mortar transfer truck at the wellhead, and then pumped into the tunnel using a squeeze pump to the top grouting hole of the steel sleeve until it is completely filled. After the initial filling of the steel sleeve, open the two pre-reserved pressure relief ports on the steel sleeve, connect the top pressure relief port to the grouting pipe, and use a high-speed automatic grouting trolley to add mud and pressurize. The pressurized grouting pressure is 0.35Mpa, and the grout is bentonite grout. Closely monitor the pressure inside the sleeve before injection. For the receiving sleeve, observe the pressure inside the sleeve. Ensure it is not less than 0.25 MPa and maintain this pressure for 30 minutes without leakage. The pressure loss should not exceed 0.05 MPa. The receiving sleeve sealing test is then complete. If leakage occurs, immediately organize sealing and continue the pressure holding test until the pressure matches the soil pressure of the surrounding strata, meeting the requirements. After the sealing test, closely monitor pressure changes inside the sleeve and assign dedicated personnel to monitor it. When the pressure inside the sleeve is less than 0.27 MPa, immediately organize grout mixing and replenish the pressure to 0.35 MPa before stopping. Before the cutterhead cuts the segments, prepare for pressure holding grouting. During the cutterhead cutting process, closely monitor pressure changes in the receiving sleeve. When the pressure is less than 0.27 MPa, immediately organize grout replenishment.

[0050] S10: Tunnel Boring Machine (TBM) Reception. Before the TBM arrives, the distance at which the TBM cutterhead will collide with the concrete segments is calculated through actual measurements. Simultaneously, ground settlement is monitored. The TBM enters the tunneling state upon reaching this distance, with ground settlement monitored every two hours. Based on the monitoring data, measures such as grouting are taken. Pre-cutting segment advance parameter settings: Before the TBM cutterhead contacts the concrete segments, attention must be paid to the selection of TBM tunneling parameters to prevent excessive correction and to ensure a good shield posture when the TBM hits the wall through correct segment selection. Segment cutting advance parameter settings: Pushing speed less than 10mm / min. The thrust should be less than 4000kN; the cutterhead speed should be 1.5-2.0rpm. During actual operation, the thrust should be adjusted according to the torque changes to control the torque to less than 800kNm. To prevent the shield machine head from being carried out of the tunnel, the shield machine head should be 3-5cm higher than the axis, in a slightly upward posture. The horizontal posture should be within ±20mm. The foam injection pipeline should be reconnected to the modified injection pump to inject modified material and modified slag during the cutting of the tunnel segments. The tunneling parameters inside the steel sleeve should be set so that after the positive ring is advanced, the shield machine has not yet fully entered the sleeve and needs to continue to advance to assemble the negative ring. When the cutter tip is about to resist the end of the sleeve, the reception is considered complete.

[0051] like Figures 1 to 2As shown, the welding device in S4 includes a tracked chassis 1, a motor 2, a semi-circular seat 3, a vertical arm 4, and a welding rod 5. The semi-circular seat 3 is fixedly connected to the top surface of the tracked chassis 1. A slot 6 is formed in the middle of the semi-circular seat 3. The vertical arm 4 is rotatably mounted inside the slot 6. The motor 2 is fixedly connected to the top surface of the tracked chassis 1. The rotating shaft of the motor 2 rotates through the side wall of the slot 6. The rotating shaft of the motor 2 is fixedly connected to the bottom of the vertical arm 4. The welding rod 5 is positioned at the top of the vertical arm 4. The welding rod 5 is connected to the positive electrode of an arc welding machine 7 via an electric wire. The negative electrode of the arc welding machine 7 is connected to the steel structure of the pipe segment via an electric wire, and the negative electrode of the arc welding machine 7 is connected to the steel structure of the pipe segment. All structural components are grounded. During operation, after the main tunnel segments are spliced ​​and installed at the starting and receiving portals, the tracked chassis 1 moves along the connecting passage to the portal, installs the welding rod 5 on the top of the vertical arm 4, connects the welding rod 5 to the positive electrode of the arc welding machine 7, connects the negative electrode of the arc welding machine 7 to the segment to be welded, and grounds it simultaneously. The motor 2 drives the vertical arm 4 to rotate along the slot 6 of the semi-circular seat 3, causing the welding rod 5 to slide over the segment to be welded, welding and fixing the segments together. This allows workers to weld the segments at the top without using scaffolding, reducing the difficulty of the work, improving the work efficiency, and enhancing the safety of the workers.

[0052] like Figures 1 to 2 As shown, a vertical groove 8 is provided at the center of the top of the vertical arm 4. A sliding arm 9 is slidably installed inside the vertical groove 8. A hydraulic cylinder 10 is fixedly connected to the bottom of the vertical groove 8. The top of the piston rod of the hydraulic cylinder 10 is fixedly connected to the bottom end of the sliding arm 9. A ring block 11 is fixedly connected to the outer ring of the middle of the vertical groove 8. The inner ring of the ring block 11 is fitted around the outer ring of the piston rod of the hydraulic cylinder 10. The top surface of the ring block 11 is located at the bottom of the sliding arm 9. During operation, the hydraulic cylinder 10 pushes the sliding arm 9 to slide out of the vertical groove 8 inside the vertical arm 4. The sliding arm 9 pushes the welding rod 5 to contact the welding position of the pipe segment. The welding height range of the welding rod 5 is controlled by the hydraulic cylinder 10, which facilitates the welding of pipe segments of different heights by the operator, thereby improving the applicability of the welding device. The ring block 11 blocks the descent distance of the sliding arm 9, reducing the probability of the sliding arm 9 hitting the hydraulic cylinder 10, thereby improving the safety of the hydraulic cylinder 10.

[0053] like Figures 2 to 3As shown, support wheels 12 are rotatably mounted on both sides of the bottom of the vertical arm 4. The inner ring of the support wheel 12 is fitted around the outer ring of the rotating shaft of the motor 2. The outer wall of the support wheel 12 is slidably engaged with the top surface of the track chassis 1. Arc-shaped sliding grooves 13 are provided on both sides of the slot 6. Arc-shaped sliders 14 are fixedly connected to both sides of the vertical arm 4. The outer wall of the arc-shaped slider 14 is slidably engaged with the inner wall of the arc-shaped sliding groove 13. Limiting sliders 15 are slidably mounted on both sides of the arc-shaped sliding groove 13. The outer wall of the limiting slider 15 is slidably engaged with the inner wall of the arc-shaped sliding groove 13. A No. 1 spring 16 is fixedly connected between the bottom of the limiting slider 15 and the bottom end of the arc-shaped sliding groove 13. During operation, when the motor 2 drives the vertical arm 4 to rotate, the vertical arm 4 drives the support wheel 12 to slide along the inside of the groove 6, and at the same time, slides against the top surface of the tracked chassis 1. The support wheel 12 supports the vertical arm 4, reducing the probability of the vertical arm 4 shaking, thereby improving the stability of welding. When the vertical arm 4 rotates, it drives the arc-shaped slider 14 to slide along the arc-shaped groove 13, causing the arc-shaped slider 14 to push the limit slider 15 to slide, which compresses the first spring 16. When the limit slider 15 slides to the bottom, it stops the vertical arm 4 from continuing to rotate, thereby reducing the probability of the vertical arm 4 hitting the side wall of the tracked chassis 1 and causing danger, and further improving the safety of the welding device.

[0054] like Figure 3 As shown, the inner and outer rings of the limiting slider 15 are provided with multiple circular grooves 17. Rollers 18 are rotatably installed inside the circular grooves 17. The outer wall of the rollers 18 slides in cooperation with the inner wall of the arc-shaped slide groove 13. During operation, when the arc-shaped slider 14 slides along the arc-shaped slide groove 13, it drives the rollers 18 to rotate in the circular grooves 17, which reduces the friction between the limiting slider 15 and the arc-shaped slide groove 13, thereby improving the smoothness of the sliding of the limiting slider 15, and thus improving the stability and smoothness of the rotation of the vertical arm 4.

[0055] like Figure 2 and Figure 4 As shown, a fixed base 19 is fixedly connected to the top of the sliding arm 9. An installation groove 20 is provided in the middle of the top surface of the fixed base 19. Multiple elastic clips 21 are fixedly connected around the bottom surface of the installation groove 20. The welding rod 5 is clamped in the middle of the multiple elastic clips 21. A cup-shaped rubber sleeve 22 is fixedly connected to the outer ring of the top surface of the fixed base 19. During operation, the welding rod 5 is inserted between the elastic clips 21. The elastic force of the elastic clips 21 clamps and fixes the welding rod 5. After the sliding arm 9 pushes the fixed base 19 close to the welding position of the pipe segment, it pushes the cup-shaped rubber sleeve 22 to wrap around the welding position of the pipe segment. The welding rod 5 is welded in the inner ring of the cup-shaped rubber sleeve 22. The welding slag from the welding rod 5 falls into the inside of the cup-shaped rubber sleeve 22, reducing the probability of welding slag falling off, thus making it easier for the operator to observe and operate from below.

[0056] like Figure 4As shown, the elastic clamp 21 has multiple protrusions 23 fixedly attached to the side near the welding rod 5. The outer wall of the protrusions 23 slides in engagement with the outer wall of the welding rod 5. The outer ring of the mounting groove 20 has multiple inner cavities 24. Clamping blocks 25 are slidably installed in the inner cavities 24. A rubber pad 26 is fixedly attached to the side of the clamping block 25 near the elastic clamp 21. The outer wall of the rubber pad 26 slides in engagement with the outer wall of the elastic clamp 21. A second spring 27 is fixedly attached between the inner cavity 24 and the clamping block 25. During operation, the protrusions 23 increase the friction between the elastic clamp 21 and the welding rod 5, thus improving the clamping firmness of the elastic clamp 21. The elastic force of the second spring 27 pushes the clamping block 25 out of the inner cavity 24, pushing the rubber pad 26 to press the elastic clamp 21, thereby further improving the clamping force of the elastic clamp 21 on the welding rod 5. The rubber material of the rubber pad 26 effectively provides insulation, reducing the probability of leakage of the welding rod 5 during welding.

[0057] like Figure 4 As shown, a rubber ring plate 28 is fixedly connected to the bottom of the inner ring of the bowl-shaped rubber sleeve 22. The inner ring of the rubber ring plate 28 is fitted around the outer ring of the welding rod 5. Multiple rubber sheets 29 are fixedly connected around the inner ring of the rubber ring plate 28. The outer wall of the rubber sheet 29 slides in fit with the outer wall of the welding rod 5. During operation, the installation groove 20 is blocked by the cooperation of the rubber ring plate 28 and the rubber sheet 29. The welding debris from welding the welding rod 5 falls onto the top surface of the rubber ring plate 28, reducing the probability of welding debris falling into the installation groove 20, thereby reducing the probability of leakage of the welding rod 5 during welding.

[0058] like Figure 2 and Figure 5 As shown, the top of the outer ring of the cup-shaped rubber sleeve 22 is fixed with multiple inserts 30, and the top of the inserts 30 is rotatably mounted with a universal wheel 31. The outer ring of the universal wheel 31 is provided with multiple protrusions 32. During operation, after the sliding arm 9 pushes the fixed seat 19 close to the welding position of the pipe segment, the universal wheel 31 contacts the bottom surface of the pipe segment. When the welding rod 5 is welding, the track chassis 1 moves, driving the fixed seat 19 to move, causing the universal wheel 31 to move. Through the provided protrusions 32, the friction between the universal wheel 31 and the pipe segment is increased, reducing the probability of the universal wheel 31 sliding, reducing the friction between the cup-shaped rubber sleeve 22 and the pipe segment, thereby reducing the probability of the cup-shaped rubber sleeve 22 deforming due to friction, and thus reducing the influence of the cup-shaped rubber sleeve 22 on the welding rod 5.

[0059] Example 2

[0060] like Figure 6As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a plurality of annular plates 33 are fixedly connected to the top surface of the rubber ring plate 28, and the inner ring of the plurality of annular plates 33 is fitted around the outer ring of the welding rod 5; during operation, the welding slag from welding of the welding rod 5 falls onto the top surface of the rubber ring plate 28 and is separated and blocked by the annular plates 33, thereby reducing the probability of the welding slag being vibrated during movement.

[0061] During operation: After the main tunnel segments are spliced ​​and installed at the starting and receiving portals, the tracked chassis 1 moves along the connecting passage to the portal; the welding rod 5 is passed through the middle of the rubber ring plate 28, causing the rubber sheet 29 to bend and deform to fit the outer ring of the welding rod 5. The welding rod 5 is inserted between the elastic clamps 21, and the elastic force of the elastic clamps 21 clamps and fixes the welding rod 5. The elastic force of the second spring 27 pushes the clamping block 25 to slide out of the inner cavity 24, pushing the rubber pad 26 to press the elastic clamps 21, increasing the clamping force of the elastic clamps 21 on the welding rod 5; the welding rod 5 is connected to the positive electrode of the arc welding machine 7, and the negative electrode of the arc welding machine 7 is connected to the segment to be welded, and grounded at the same time;

[0062] The hydraulic cylinder 10 pushes the sliding arm 9 out of the vertical groove 8 inside the vertical arm 4. The sliding arm 9 pushes the fixed seat 19 closer to the welding position of the tube segment, so that the welding rod 5 contacts the welding position of the tube segment. The caster wheel 31 contacts the bottom surface of the tube segment, and the cup-shaped rubber sleeve 22 wraps the welding position of the tube segment. The welding rod 5 welds on the inner ring of the cup-shaped rubber sleeve 22. The welding slag from the welding rod 5 falls onto the top surface of the rubber ring plate 28, reducing the probability of welding slag falling into the mounting groove 20 and reducing the probability of leakage of the welding rod 5 during welding.

[0063] When welding rod 5 is used, motor 2 drives vertical arm 4 to rotate. Vertical arm 4 drives support wheel 12 to slide along the inside of slot 6 and simultaneously slides against the top surface of track chassis 1. Support wheel 12 supports vertical arm 4, reducing the probability of vertical arm 4 shaking. When vertical arm 4 rotates, it drives arc slider 14 to slide along arc groove 13, causing arc slider 14 to push limit slider 15 to slide, causing spring 16 to compress. When limit slider 15 slides to the bottom, it stops vertical arm 4 from continuing to rotate, thereby reducing the probability of vertical arm 4 hitting the side wall of track chassis 1 and causing danger. When vertical arm 4 rotates, it drives welding rod 5 to slide over the welding position of the pipe segment, welding and fixing the pipe segments together. This allows workers to weld the pipe segments at the top without the need for scaffolding, reducing the difficulty of the workers' work, improving the workers' work efficiency, and improving the safety of the workers.

[0064] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0065] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method of construction of a connecting tunnel by means of a shield, characterized in that: The construction method comprises the following steps: S1: equipment assembly; each section of the connecting channel tunneling machine is connected by connecting rods and connecting pins; after being lowered into the well, front and rear supports and jacks are installed, and then the tunnel is pulled into the designated position by a battery car, pipeline connection of the equipment and related debugging work are carried out; S2: hole arrangement; due to the limited space in the tunnel, the water pipe and the walkway plate are arranged in the track area, the walkway plate is not provided with a handrail support, LED light strips are used for lighting, and the high-voltage cable in the tunnel is hung by a cable hook after the tunneling machine is transported to the designated position; S3: secondary grouting of the pipe segment near the hole; before starting, the left and right lines of the connecting channel are grouted again, to ensure the grouting effect; S4: hole steel pipe segment processing; the steel structure parts of the six pipe segments at the starting and receiving hole of the main tunnel pipe segment are welded into a whole by using a welding device, and the welding is carried out in multiple layers, and the welding thickness is 3-5 mm per layer; S5: installation of the starting sleeve and the reaction frame; there is a 65 mm gap between the tunneling machine and the starting sleeve, there is a 135 mm gap between the pipe segment of the connecting channel and the starting sleeve after the machine enters the hole, three steel wire brushes and shield tail grease are used for sealing to ensure the temporary sealing of the interface during the starting process; the reaction frame is placed in the machine on the ground, and after the trolley support system is loaded, the reaction frame is pushed out to the rear support system for welding and reinforcement; before the sleeve starts, the sleeve needs to be filled with a filling medium for sealing and pressure maintaining; the filling medium usually selects bentonite material, and the pressure value is set to about 1.5 Mpa; S6: tunneling, earth excavation and pipe segment assembly; the muck is pushed into the main tunnel, and then transported out by the muck car in the main tunnel, and after being transported to the wellhead, it is lifted out by a crane, and then stored in a muck box, and then arranged for earth excavation; according to the design requirements, the pipe segment assembly construction is carried out; then, the back wall grouting is carried out; S7: pipe segment weakening treatment; the strength of the hole concrete structure is weakened by drilling, and the cutter head of the shield machine first grinds through the center part of the pipe segment, and then cuts outward in an elliptical shape; in order to ensure that the cutter head of the shield machine quickly enters and exits the pipe segment during starting or receiving, and to ensure the stability of the soil body; S8: installation of the receiving steel sleeve; the receiving steel sleeve is divided into four sections, the front end, the lengthened ring and the rear end are integrated, and the middle section is divided into upper and lower semicircles; the outer periphery of each section of the cylinder is welded with longitudinal and circumferential rib plates to ensure the stiffness of the cylinder, and the joint surface of each section is welded with a flange, and an O-shaped sealing strip is added in the middle; S9: steel sleeve filling; when the cutter head is 500 mm away from the receiving end pipe segment, the tunneling is stopped, and after the steel sleeve assembly is completed, the steel sleeve is filled; S10: shield machine receiving; before the shield machine arrives, the mileage at which the shield cutter head collides with the concrete pipe segment is calculated by actual measurement, and the ground settlement is monitored, and according to the monitoring data, measures such as supplementary grouting are taken; the cutting pipe segment pushing parameter setting, the steel sleeve tunneling parameter setting, and the positive ring pushing completion, the shield machine has not completely arrived in the sleeve, and needs to continue to push and assemble the negative ring, and when the cutter head is about to reach the end of the sleeve, it is considered that the receiving is completed; The welding device in S4 comprises a crawler chassis (1), a motor (2), a semicircular seat (3), a vertical arm (4) and an electrode (5); the top surface of the crawler chassis (1) is fixedly connected with the semicircular seat (3), the middle part of the semicircular seat (3) is provided with a notch (6), the vertical arm (4) is rotatably installed in the notch (6), the top surface of the crawler chassis (1) is fixedly connected with the motor (2), the rotating shaft of the motor (2) penetrates through the side wall of the notch (6), the rotating shaft of the motor (2) is fixedly connected with the bottom of the vertical arm (4), the top of the vertical arm (4) is provided with the electrode (5), the electrode (5) is connected with the positive electrode of an electric arc welding machine (7) through an electric wire, the negative electrode of the electric arc welding machine (7) is connected with the steel structure part of the pipe piece through an electric wire, and the negative electrode of the electric arc welding machine (7) and the steel structure part of the pipe piece are both grounded; both sides of the bottom of the vertical arm (4) are rotatably installed with support wheels (12), the inner ring of the support wheel (12) is sleeved on the outer ring of the rotating shaft of the motor (2), the outer wall of the support wheel (12) is in sliding fit with the top surface of the crawler chassis (1), both sides of the notch (6) are provided with arc-shaped sliding grooves (13), both sides of the vertical arm (4) are fixedly connected with arc-shaped sliding blocks (14), the outer wall of the arc-shaped sliding block (14) is in sliding fit with the inner wall of the arc-shaped sliding groove (13), both sides of the arc-shaped sliding groove (13) are slidably installed with limiting sliding blocks (15), the outer wall of the limiting sliding block (15) is in sliding fit with the inner wall of the arc-shaped sliding groove (13), and a first spring (16) is fixedly connected between the bottom of the limiting sliding block (15) and the bottom end of the arc-shaped sliding groove (13).

2. The method according to claim 1, wherein: the middle part of the top end of the vertical arm (4) is provided with a vertical groove (8), the vertical groove (8) is slidably installed with a sliding arm (9), the bottom of the vertical groove (8) is fixedly connected with a hydraulic cylinder (10), the top end of the piston rod of the hydraulic cylinder (10) is fixedly connected with the bottom end of the sliding arm (9), the middle part of the outer ring of the vertical groove (8) is fixedly connected with a ring block (11), the inner ring of the ring block (11) is sleeved on the outer ring of the piston rod of the hydraulic cylinder (10), and the top surface of the ring block (11) is located at the bottom of the sliding arm (9).

3. The method according to claim 1, wherein: the inner ring and the outer ring of the limiting sliding block (15) are both provided with a plurality of circular grooves (17), the inner part of the circular groove (17) is rotatably installed with a roller (18), and the outer wall of the roller (18) is in sliding fit with the inner wall of the arc-shaped sliding groove (13).

4. The method according to claim 2, wherein: the top end of the sliding arm (9) is fixedly connected with a fixing seat (19), the top surface of the fixing seat (19) is provided with an installation groove (20) in the middle part, the bottom surface of the installation groove (20) is fixedly connected with a plurality of elastic clamping pieces (21) in a surrounding manner, the middle part of the elastic clamping piece (21) clamps and installs the electrode (5), and the top surface of the fixing seat (19) is fixedly connected with a bowl-shaped rubber sleeve (22) in the outer ring.

5. A method according to claim 4, wherein: The elastic clamping piece (21) is fixed with a plurality of convex strips (23) on one side close to the welding rod (5), the outer wall of the convex strip (23) is in sliding fit with the outer wall of the welding rod (5), a plurality of inner cavities (24) are formed in the outer circle of the mounting groove (20), the clamping block (25) is slidably mounted in the inner cavity (24), the rubber pad (26) is fixed on the side of the clamping block (25) close to the elastic clamping piece (21), the outer wall of the rubber pad (26) is in sliding fit with the outer wall of the elastic clamping piece (21), and the second spring (27) is fixed between the inner cavity (24) and the clamping block (25).

6. The method according to claim 4, wherein: The inner circle bottom of the bowl-shaped rubber sleeve (22) is fixed with the rubber ring plate (28), the inner circle of the rubber ring plate (28) is sleeved on the outer circle of the welding rod (5), a plurality of rubber sheets (29) are fixed around the inner circle of the rubber ring plate (28), and the outer wall of the rubber sheet (29) is in sliding fit with the outer wall of the welding rod (5).

7. The method according to claim 4, wherein: The outer circle top of the bowl-shaped rubber sleeve (22) is fixed with a plurality of inlay blocks (30), the top of the inlay block (30) is rotatably provided with the universal wheel (31), and the outer circle of the universal wheel (31) is provided with a plurality of protrusions (32).

8. The method according to claim 6, wherein: The top surface of the rubber ring plate (28) is fixed with a plurality of annular plates (33), and the inner circles of the plurality of annular plates (33) are sleeved on the outer circle of the welding rod (5).

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