A method for constructing bored piles penetrating underground structures

Abstract

The present invention belongs to the field of building construction technology, specifically a method for constructing bored piles penetrating underground structures, comprising a crawler chassis, a turntable, a No. 1 hydraulic cylinder, an installation arm and a support column; a turntable is rotatably installed on the top surface of the crawler chassis, a plurality of No. 1 hydraulic cylinders are evenly installed around the top surface of the turntable, a mounting arm is installed on the end of the piston rod of the No. 1 hydraulic cylinder, and a plurality of support columns are slidably installed on the middle part of the mounting arm; the crawler chassis is controlled to move to the interior of the existing structure, and the No. 1 hydraulic cylinder pushes the installation arm to expand outward, connects and fixes the plurality of support columns end to end, and installs them to the middle part of the installation arm; the existing structure is supported by the plurality of support columns, and when drilling, only the No. 1 hydraulic cylinder needs to be rotated to change the supporting position of the support column, which reduces the difficulty of disassembly for the staff; after the construction is completed, the crawler chassis is controlled to be transferred, which improves the work efficiency of the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, in particular to a construction method of bored piles penetrating underground structures. Background Art

[0002] Bored piles are piles that are made by mechanically drilling a hole in the foundation soil, placing a steel cage in it, and pouring concrete into it. They are mainly used to increase the bearing capacity of the foundation, and can also be used for slope maintenance to resist lateral pressure from the earth and prevent earth displacement.

[0003] In cities, due to the large number of underground buildings, underground structures are often encountered during drilling and grouting pile construction. It is necessary to penetrate the underground structures before grouting construction. Directly penetrating the underground structures will cause damage to the structure of the underground structures and cause collapse and damage to the underground structures. Therefore, when drilling holes in underground structures, the underground structures will be supported first.

[0004] The existing support method uses scaffolding for support, but when drilling underground structures, part of the scaffolding structure will hinder the drilling process, so part of the scaffolding structure needs to be dismantled. After the drilling is completed, the scaffolding needs to be installed again, which not only increases the workload of the staff, but also reduces the efficiency of bored pile construction and prolongs the time of bored pile construction.

[0005] To this end, the present invention provides a method for constructing bored piles that penetrate underground structures. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a bored pile construction method for penetrating an underground structure, the bored pile construction method comprising the following steps:

[0008] S11: After the drilling rig is installed in place, the first stage of drilling construction is carried out. Drilling is stopped when the drilling rig reaches the top of the existing structure and continues drilling after the existing structure is broken down. A conical drill bit is used for dry drilling of the shallow sand layer above the structure. The pebble layer below the structure is a gravel layer. With increasing depth, the pebble content gradually increases and the particle size increases, which will cause continuous drill jams, making it difficult to suck out the pebbles and difficult for the conical drill bit to drill. A cylindrical drill bit should be used instead. The cylindrical drill bit is conducive to sucking out the pebbles using the reverse circulation method, but it will increase the drilling torque, so graded drilling is recommended. In the shallow gravel sand layer, a small cylindrical drill bit is used for drilling. This drill bit is small and has little resistance, which is conducive to drilling. The reverse circulation suction pipe in the barrel is conducive to the discharge of pebbles. The small cylindrical drill bit should be replaced with a large cylindrical drill bit every 5 to 8 meters of drilling.

[0009] S12: Demolish the existing structure in the dark excavation area. First, use a jackhammer to remove the concrete from the bottom slab of the dark excavation area to create space for the support structure, which is then used to support the existing structure. The support structure replaces the existing conventional scaffolding structure, which not only reduces the difficulty of disassembly and installation for workers, but also makes it easier for workers to adjust the support position and facilitates movement.

[0010] S13: Chisel away the primary concrete supporting the arch crown, leaving the steel bars therein for reliable connection with the steel casing. Fill the gaps at the connection with C30 concrete, while retaining sufficient steel bars of sufficient length to connect with the secondary lining structure of the shield receiving shaft and cast together. Chisel away the concrete at the retaining piles and diaphragms with a jackhammer, leaving the steel bars therein. Chisel away the primary concrete supporting the arch base within the retaining piles, leaving the steel bars therein.

[0011] S14: After the chiseling is completed, part of the supporting structure is removed to facilitate the lowering of the steel casing. The drilling rig is used to drill the hole, and the casing is then sunk. The steel casing is hoisted to the designed position and welded to the steel bars reserved during the chiseling. After welding, the concrete in the pile is poured. After the retaining piles are installed, the initial concrete of the other piles and the retaining piles are then removed in sequence.

[0012] S15: After the arch structure is demolished, the steel casing is hoisted. The steel casing is divided into two sections, each 12m high and 1cm thick. During the hoisting, welding ears are welded on both sides of the steel casing. After the welding is completed and the trial hoisting test is carried out, the steel casing is hoisted to the arch structure and temporarily fixed on the ground with steel bars. The exposed length on the ground is about 1.5m.

[0013] S16: When welding the steel casing on the ground, the steel casing is supported by using No. 25 I-steel and Φ25 steel bars to prevent it from falling. Then, the other section of the steel casing is hoisted into the air by a crane, and the two sections are welded together on the ground. The welded steel casing is hoisted to the designed position and fixed. The exposed steel bars after the original structure is removed are welded to the steel casing, and C20 concrete is sprayed and mixed to make it dense.

[0014] S17: Grouting is performed to stop water in the lower part of the designed position of the pile. The drill rod retreat grouting method is used. Vertical drilling is carried out. First, the hole is drilled to the designed hole depth. Then, the drill is lifted and grouting is performed every 0.5m. The hole spacing is 1.0m, the reinforcement depth is 3.0m, and the arrangement is in a plum blossom shape. PO.42.5 cement is used for grouting. The various test technical indicators of the cement used must comply with the current national standards. If the cement has been out of the factory for more than three months, the various technical indicators should be reviewed before use. Before starting drilling, the drilling rig must be leveled with a level to keep the machine body stable. After it is in place, the drill rod and the borehole must be kept vertical, and the borehole deviation must be controlled at 1%. The drilling speed should be maintained at a medium speed. When encountering hard layers, the drilling should be slowed down to prevent the drill from getting stuck. Slurry type: cement-water-glass double-liquid slurry; grouting pipe length: 4m; slurry diffusion radius: R≥0.5m; grouting pressure: 0.5~0.8MPa, which should be adjusted according to the actual grouting water-stopping effect during grouting; for locations close to existing linear structures, the grouting pressure is reduced to 0.3~0.5MPa, and low-pressure grouting is performed multiple times to avoid damage to the existing structure; permeability coefficient: 1×10-6cm / s.

[0015] S18: After the steel casing is fixed, the pile body below the structure is constructed by drilling and grouting. When approaching the bottom elevation of the hole, the lifting speed of the drill bit is reduced to avoid loosening the bearing layer. The power head drives the drill bit at the lower end of the drill rod, and the cutting edge at the lower end of the drill bit cuts and crushes the soil layer. The cut soil is squeezed into the drill bucket. When it is full, the drill bucket is lifted out of the hole. The drilling rig chassis is rotated and the drill bucket valve is opened to discharge the soil to the ground or directly unload it onto a vehicle for transportation. This process is repeated until the bottom elevation of the hole is reached.

[0016] S19: After the hole is cleaned and the rebar cage is installed, the pile body can be poured. Before pouring underwater concrete, check the sediment thickness again. If it exceeds 10 cm, use the guide tube for a second hole cleanout. Depending on the geological conditions, positive or reverse circulation can be used. If necessary, high-pressure air can be used to flush the bottom sediment. After the hole is cleaned, pour underwater concrete immediately. Calculate and control the amount of the first batch of bottom-sealing concrete, ensuring that the concrete has a certain impact energy during the fall. Sufficient impact energy can dislodge the sediment at the bottom of the pile as much as possible. This is a key step in controlling pile bottom sediment and reducing post-construction settlement. After the initial pour, pour concrete into the guide tube from the side of the funnel opening. Do not fill it all at once to avoid air pockets. When the concrete in the hole approaches the bottom of the rebar cage, maintain the guide tube buried depth and slow the pouring speed. When the concrete surface in the hole has penetrated 1-2 meters into the rebar cage, appropriately raise the guide tube to reduce its buried depth and increase the depth of the rebar cage in the underlying concrete. Measure the height of the poured concrete surface at all times and control the guide tube buried depth within the range of 2-6 meters. Towards the end of pouring, the concrete column height inside the conduit decreases, reducing overpressure. However, the slurry and the slag contained within the conduit increase in consistency and relative density. If concrete lifting becomes difficult in this situation, water can be added to dilute the slurry and some of the settled soil can be removed to facilitate pouring. When removing the last section of conduit, do so slowly to prevent the slurry deposited at the pile top from squeezing under the conduit and forming a core. Because the pile top contains slag, the concrete pouring height must exceed the pile top elevation by at least 1.0m.

[0017] Preferably, the supporting method of the supporting structure comprises the following steps:

[0018] S21: After removing the concrete floor of the underground excavation area to create an operating space, the crawler chassis is maneuvered to move inside the existing structure. Hydraulic cylinder No. 1 pushes the installation arm to expand outward, while hydraulic cylinder No. 3 pushes the floor down to contact the bottom surface for support.

[0019] S22: Place the support column on top of the middle support plate of the mounting arm, and the No. 2 hydraulic cylinder pushes the support plate up, pushing the top seat up;

[0020] S23: After the bottom of the support column rises to the top of the mounting arm, the No. 4 hydraulic cylinder pushes the clamping plate to squeeze the bottom of the support column to fix the support column;

[0021] S24: The second hydraulic cylinder drives the pallet to descend, and then a support column is placed on the top surface of the pallet. At the same time, a pin is used to fix the bottom support column to the adjacent top support column;

[0022] S25: The No. 2 hydraulic cylinder pushes the bottom support column to continue to rise. At the same time, the No. 4 hydraulic cylinder drives the clamping plate to release the adjacent top support column.

[0023] S26: Repeat the connection and installation of the support columns several times until the top seat is close to the top of the existing structure, and then push it with the No. 2 hydraulic cylinder so that the top seat contacts the top of the existing structure to support the existing structure;

[0024] S27: When drilling is required, it is only necessary to lower the top seat through the No. 2 hydraulic cylinder, and then rotate the rotating block to rotate the support column and the top seat away from the drilling position; after the construction is completed, it is only necessary to control the crawler chassis to transfer the construction site.

[0025] Preferably, the supporting structure includes a crawler chassis, a turntable, a No. 1 hydraulic cylinder, a mounting arm and a support column; a turntable is rotatably mounted on the top surface of the crawler chassis, and a plurality of No. 1 hydraulic cylinders are evenly mounted around the top surface of the turntable, and the piston rod end of the No. 1 hydraulic cylinder is mounted with a mounting arm, and a plurality of support columns are slidably mounted on the middle part of the mounting arm, and the adjacent support columns are fixed end to end; during operation, after removing the concrete of the bottom slab of the dark excavation section and opening up the operating space, the crawler chassis is controlled to move to the interior of the existing structure, and the No. 1 hydraulic cylinder steel pushes the mounting arm to expand outward, connects and fixes the plurality of support columns end to end, and installs them to the middle part of the mounting arm; the existing structure is supported by a plurality of support columns, and when drilling is carried out, it is only necessary to rotate the No. 1 hydraulic cylinder that hinders the drilling construction to change the supporting position of the support column, thereby reducing the difficulty of disassembly for the staff; after the construction is completed, it is only necessary to dismantle the support column to control the crawler chassis to move, thereby improving the work efficiency of the staff.

[0026] Preferably, a No. 2 hydraulic cylinder is fixedly connected to the bottom of the inner cavity of the mounting arm, and the top end of the piston rod of the No. 2 hydraulic cylinder is fixedly connected to a support plate, and the top surface of the support plate slides with the lower end of the bottom support column, and the bottom outer ring of the mounting arm is evenly fixed with multiple No. 3 hydraulic cylinders, and the lower end of the piston rod of the No. 3 hydraulic cylinder is fixedly connected to the bottom plate; when working, the No. 1 hydraulic cylinder pushes the mounting arm to expand outward, and the No. 3 hydraulic cylinder pushes the bottom plate to contact the ground, which not only improves the supporting strength of the support column, but also provides support for the turntable, reducing the probability of deformation and damage to the turntable; and provides a fixing effect on the crawler chassis, thereby improving the stability of the crawler chassis; the No. 2 hydraulic cylinder pushes the support plate up, which pushes the support column up, thereby facilitating the staff to support positions at different heights, thereby improving the applicability of the support structure.

[0027] Preferably, a slot is provided at the lower end of the support column, and a fixing block is fixedly connected to the top of the support column, the size of the fixing block matches the size of the slot, and a fixing opening is provided in the middle of the fixing block and the side wall of the slot, and a pin is slidably installed inside the fixing opening, and a No. 4 hydraulic cylinder is fixedly connected to the top side wall of the mounting arm, and the piston rod of the No. 4 hydraulic cylinder slides through the outer wall of the mounting arm, and the end of the piston rod of the No. 4 hydraulic cylinder is fixedly connected to a splint, and the outer wall of the splint is slidably matched with the outer wall of the support column; when working, when installing the support column, the support column is placed on the top of the middle support plate of the mounting arm, and the No. 2 hydraulic cylinder pushes the support plate to rise, and wait for the bottom of the support column to be on After rising to the top of the installation arm, the No. 4 hydraulic cylinder pushes the splint to squeeze the bottom of the support column to fix the support column. The No. 2 hydraulic cylinder drives the pallet to descend, and then places a support column on the top surface of the pallet. At the same time, use pins to fix the bottom support column with the adjacent top support column. The No. 2 hydraulic cylinder pushes the bottom support column to continue to rise. At the same time, the No. 4 hydraulic cylinder drives the splint to release the adjacent top support column. Repeat the connection and installation of the support columns many times so that the top seat is close to the top of the existing structure, and then pushes it through the No. 2 hydraulic cylinder so that the top seat contacts the top of the existing structure to support the existing structure, thereby facilitating the staff to install and remove the support columns.

[0028] Preferably, a top seat is installed at the top of the support column, a plurality of grooves are opened on the top surface of the top seat, and a supporting beam is bolted inside the groove; by setting the top seat and the supporting beam, the supporting area and range of the top of the existing structure are increased, the probability of collapse and falling of the top of the existing structure is reduced, and the safety of construction is improved.

[0029] Preferably, panels are fixed on both sides of the bottom surface of the top seat, a locking bolt is threadedly installed on the middle part of the panel, and the locking bolt passes through the panel, and sliding grooves are provided on both sides of the top end of the mounting arm, and the inner wall of the sliding groove slides with the outer wall of the panel; through the cooperation of the locking bolt and the panel, not only the top seat can be fixed to the top of the support column, but also the top seat can be fixed to the top of the mounting arm, thereby facilitating the fixed installation of the top seat.

[0030] Preferably, a plurality of circular grooves are provided around the top surface of the turntable, a swivel seat is rotatably installed inside the circular groove, and a plurality of slots are provided around the bottom of the swivel seat, a wedge block is slidably installed in the middle of the swivel seat, and a swivel block is fixedly connected to the top surface of the swivel seat, and the swivel block is fixedly connected to the cylinder body of the No. 1 hydraulic cylinder. A screw is threadedly installed in the middle part of the swivel block, and the lower end of the screw is rotatably connected to the top surface of the wedge block; during operation, when drilling is required, the swivel block is rotated to drive the swivel seat to rotate along the circular groove, thereby adjusting the support position of the support column; after the position adjustment of the support column is completed, the screw is turned to push the wedge block to slide downward and squeeze the bottom surface of the circular groove, and at the same time the wedge block pushes the swivel seat to expand outward along the slot, so that the outer wall of the swivel seat squeezes the inside of the circular groove, thereby fixing and locking the swivel block, reducing the probability of movement of the support column.

[0031] Preferably, the end of the piston rod of the No. 1 hydraulic cylinder is fixedly connected to a mounting seat, a cross bar is rotatably mounted in the middle of the mounting seat, the end of the cross bar is fixedly connected to the middle of the mounting arm, the top surface of the mounting seat is fixedly connected to a motor, the outer ring of the motor's rotating shaft and the outer ring of the cross bar are both fixedly connected to gears, and the two gears are meshed with each other, and an arc groove is provided on the side of the bottom of the mounting seat close to the turntable, and the inner wall of the arc groove slides with the outer ring of the turntable; the gear is driven to rotate by the motor, and the mounting arm is driven to rotate through the meshing transmission of the gears, thereby storing the mounting arm, which is convenient for the movement of the crawler chassis; the sliding cooperation of the arc groove and the outer ring of the turntable improves the stability of the mounting arm after storage, and at the same time, improves the stability of the No. 1 hydraulic cylinder.

[0032] Preferably, a plurality of mounting grooves are provided on the top surface of the support plate, and inserts are slidably installed inside the mounting grooves, and the inserts are fixed to the bottom of the support column by bolts; by fixing the inserts to the inside of the mounting grooves, the last installed support column is fixed, thereby reducing the probability of shaking and displacement of the support column, and then improving the supporting strength of the existing structure.

[0033] The beneficial effects of the present invention are as follows:

[0034] 1. The method for constructing bored piles penetrating underground structures described in the present invention comprises the following steps: providing a crawler chassis, a turntable, a No. 1 hydraulic cylinder, an installation arm and a support column; manipulating the crawler chassis to move to the interior of an existing structure, and pushing the installation arm outward with the No. 1 hydraulic cylinder to expand, connecting and fixing a plurality of support columns end to end, and installing them to the middle of the installation arm; supporting the existing structure by means of a plurality of support columns, and when drilling, only the No. 1 hydraulic cylinder that obstructs the drilling construction needs to be rotated to change the support position of the support column, thereby reducing the difficulty of disassembly for the staff; after the construction is completed, only the support column needs to be disassembled, and the crawler chassis can be controlled to be transferred, thereby improving the work efficiency of the staff.

[0035] When the support column is lifted up, the support column is lifted up and the support column is fixed to the top of the support column, and the support column is fixed to the top of the support column, and the No. 2 hydraulic cylinder drives the support column to move upward, and the No. 4 hydraulic cylinder drives the clamping plate to squeeze the bottom of the support column to fix the support column, and the No. 2 hydraulic cylinder drives the support column to move downward, and then a support column is placed on the top surface of the support column. At the same time, a pin is used to fix the bottom support column and the adjacent top support column, and the No. 2 hydraulic cylinder drives the bottom support column to continue to rise. At the same time, the No. 4 hydraulic cylinder drives the clamping plate to release the adjacent top support column; repeat the connection and installation of the support columns many times, so that the top seat is close to the top of the existing structure, and then it is pushed by the No. 2 hydraulic cylinder so that the top seat contacts the top of the existing structure, supporting the existing structure, thereby facilitating the installation and removal of the support columns by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Figure 1 is a perspective view of embodiment 1 of the present invention;

[0038] Figure 2 is a perspective view of the mounting arm in the first embodiment of the present invention;

[0039] Figure 3 is an exploded view of the mounting arm in the first embodiment of the present invention;

[0040] Figure 4 is a cross-sectional view of the transfer seat in the first embodiment of the present invention;

[0041] Figure 5 is a partial structural diagram of the mounting arm in the second embodiment of the present invention;

[0042] Figure 6 Flowchart of the bored pile construction method of the present invention;

[0043] Figure 7 Flowchart of the support method of the present invention;

[0044] In the figure: 1. crawler chassis; 2. turntable; 3. No. 1 hydraulic cylinder; 4. mounting arm; 5. support column; 6. No. 2 hydraulic cylinder; 7. support plate; 8. No. 3 hydraulic cylinder; 9. bottom plate; 10. slot; 11. fixing block; 12. fixing port; 13. pin; 14. No. 4 hydraulic cylinder; 15. splint; 16. top seat; 17. supporting beam; 18. panel; 19. locking bolt; 20. slide; 21. circular groove; 22. swivel seat; 23. wedge block; 24. swivel block; 25. screw; 26. mounting seat; 27. cross bar; 28. motor; 29. gear; 30. arc groove; 31. mounting groove; 32. panel. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0046] Example 1

[0047] like Figure 6 As shown, a bored pile construction method for penetrating an underground structure according to an embodiment of the present invention comprises the following steps:

[0048] S11: After the drilling rig is installed in place, the first stage of drilling construction is carried out. Drilling is stopped when the drilling rig reaches the top of the existing structure and continues drilling after the existing structure is broken down. A conical drill bit is used for dry drilling of the shallow sand layer above the structure. The pebble layer below the structure is a gravel layer. With increasing depth, the pebble content gradually increases and the particle size increases, which will cause continuous drill jams, making it difficult to suck out the pebbles and difficult for the conical drill bit to drill. A cylindrical drill bit should be used instead. The cylindrical drill bit is conducive to sucking out the pebbles using the reverse circulation method, but it will increase the drilling torque, so graded drilling is recommended. In the shallow gravel sand layer, a small cylindrical drill bit is used for drilling. This drill bit is small and has little resistance, which is conducive to drilling. The reverse circulation suction pipe in the barrel is conducive to the discharge of pebbles. The small cylindrical drill bit should be replaced with a large cylindrical drill bit every 5 to 8 meters of drilling.

[0049] S12: Demolish the existing structure in the dark excavation area. First, use a jackhammer to remove the concrete from the bottom slab of the dark excavation area to create space for the support structure, which is then used to support the existing structure. The support structure replaces the existing conventional scaffolding structure, which not only reduces the difficulty of disassembly and installation for workers, but also makes it easier for workers to adjust the support position and facilitates movement.

[0050] S13: Chisel away the primary concrete supporting the arch crown, leaving the steel bars therein for reliable connection with the steel casing. Fill the gaps at the connection with C30 concrete, while retaining sufficient steel bars of sufficient length to connect with the secondary lining structure of the shield receiving shaft and cast together. Chisel away the concrete at the retaining piles and diaphragms with a jackhammer, leaving the steel bars therein. Chisel away the primary concrete supporting the arch base within the retaining piles, leaving the steel bars therein.

[0051] S14: After the chiseling is completed, part of the supporting structure is removed to facilitate the lowering of the steel casing. The drilling rig is used to drill the hole, and the casing is then sunk. The steel casing is hoisted to the designed position and welded to the steel bars reserved during the chiseling. After welding, the concrete in the pile is poured. After the retaining piles are installed, the initial concrete of the other piles and the retaining piles are then removed in sequence.

[0052] S15: After the arch structure is demolished, the steel casing is hoisted. The steel casing is divided into two sections, each 12m high and 1cm thick. During the hoisting, welding ears are welded on both sides of the steel casing. After the welding is completed and the trial hoisting test is carried out, the steel casing is hoisted to the arch structure and temporarily fixed on the ground with steel bars. The exposed length on the ground is about 1.5m.

[0053] S16: When welding the steel casing on the ground, the steel casing is supported by using No. 25 I-steel and Φ25 steel bars to prevent it from falling. Then, the other section of the steel casing is hoisted into the air by a crane, and the two sections are welded together on the ground. The welded steel casing is hoisted to the designed position and fixed. The exposed steel bars after the original structure is removed are welded to the steel casing, and C20 concrete is sprayed and mixed to make it dense.

[0054] S17: Grouting is performed to stop water in the lower part of the designed position of the pile. The drill rod retreat grouting method is used. Vertical drilling is carried out. First, the hole is drilled to the designed hole depth. Then, the drill is lifted and grouting is performed every 0.5m. The hole spacing is 1.0m, the reinforcement depth is 3.0m, and the arrangement is in a plum blossom shape. PO.42.5 cement is used for grouting. The various test technical indicators of the cement used must comply with the current national standards. If the cement has been out of the factory for more than three months, the various technical indicators should be reviewed before use. Before starting drilling, the drilling rig must be leveled with a level to keep the machine body stable. After it is in place, the drill rod and the borehole must be kept vertical, and the borehole deviation must be controlled at 1%. The drilling speed should be maintained at a medium speed. When encountering hard layers, the drilling should be slowed down to prevent the drill from getting stuck. Slurry type: cement-water-glass double-liquid slurry; grouting pipe length: 4m; slurry diffusion radius: R≥0.5m; grouting pressure: 0.5~0.8MPa, which should be adjusted according to the actual grouting water-stopping effect during grouting; for locations close to existing linear structures, the grouting pressure is reduced to 0.3~0.5MPa, and low-pressure grouting is performed multiple times to avoid damage to the existing structure; permeability coefficient: 1×10-6cm / s.

[0055] S18: After the steel casing is fixed, the pile body below the structure is constructed by drilling and grouting. When approaching the bottom elevation of the hole, the lifting speed of the drill bit is reduced to avoid loosening the bearing layer. The power head drives the drill bit at the lower end of the drill rod, and the cutting edge at the lower end of the drill bit cuts and crushes the soil layer. The cut soil is squeezed into the drill bucket. When it is full, the drill bucket is lifted out of the hole. The drilling rig chassis is rotated and the drill bucket valve is opened to discharge the soil to the ground or directly unload it onto a vehicle for transportation. This process is repeated until the bottom elevation of the hole is reached.

[0056] S19: After the hole is cleaned and the rebar cage is installed, the pile body can be poured. Before pouring underwater concrete, check the sediment thickness again. If it exceeds 10 cm, use the guide tube for a second hole cleanout. Depending on the geological conditions, positive or reverse circulation can be used. If necessary, high-pressure air can be used to flush the bottom sediment. After the hole is cleaned, pour underwater concrete immediately. Calculate and control the amount of the first batch of bottom-sealing concrete, ensuring that the concrete has a certain impact energy during the fall. Sufficient impact energy can dislodge the sediment at the bottom of the pile as much as possible. This is a key step in controlling pile bottom sediment and reducing post-construction settlement. After the initial pour, pour concrete into the guide tube from the side of the funnel opening. Do not fill it all at once to avoid air pockets. When the concrete in the hole approaches the bottom of the rebar cage, maintain the guide tube buried depth and slow the pouring speed. When the concrete surface in the hole has penetrated 1-2 meters into the rebar cage, appropriately raise the guide tube to reduce its buried depth and increase the depth of the rebar cage in the underlying concrete. Measure the height of the poured concrete surface at all times and control the guide tube buried depth within the range of 2-6 meters. Towards the end of pouring, the concrete column height inside the conduit decreases, reducing overpressure. However, the slurry and the slag contained within the conduit increase in consistency and relative density. If concrete lifting becomes difficult in this situation, water can be added to dilute the slurry and some of the settled soil can be removed to facilitate pouring. When removing the last section of conduit, do so slowly to prevent the slurry deposited at the pile top from squeezing under the conduit and forming a core. Because the pile top contains slag, the concrete pouring height must exceed the pile top elevation by at least 1.0m.

[0057] like Figure 7 As shown, the supporting method of the supporting structure includes the following steps:

[0058] S21: After removing the concrete floor of the dark excavation area to create an operating space, the crawler chassis 1 is maneuvered to move into the existing structure. The No. 1 hydraulic cylinder 3 pushes the mounting arm 4 to expand outward, and the No. 3 hydraulic cylinder 8 pushes the bottom plate 9 down to contact the bottom surface for support.

[0059] S22: Place the support column 5 on top of the middle support plate 7 of the mounting arm 4, and the No. 2 hydraulic cylinder 6 pushes the support plate 7 upward, pushing the top seat 16 upward;

[0060] S23: After the bottom of the support column 5 rises to the top of the mounting arm 4, the fourth hydraulic cylinder 14 pushes the clamping plate 15 to squeeze the bottom of the support column 4 to fix the support column 5;

[0061] S24: The second hydraulic cylinder 6 drives the support plate 7 to descend, and then a support column 5 is placed on the top surface of the support plate 7. At the same time, the bottom support column 5 is fixedly connected to the adjacent top support column 5 using the pin 13;

[0062] S25: The second hydraulic cylinder 6 pushes the bottom support column 5 to continue to rise. At the same time, the fourth hydraulic cylinder 14 drives the clamping plate 15 to release the adjacent top support column 5.

[0063] S26: Repeat the connection and installation of the support columns 5 multiple times until the top seat 16 is close to the top of the existing structure, and then push the top seat 16 through the second hydraulic cylinder 6 so that the top seat 16 contacts the top of the existing structure to support the existing structure;

[0064] S27: When drilling is required, the top seat 16 only needs to be lowered by the No. 2 hydraulic cylinder 6, and then the rotating block 24 is rotated to rotate the support column 4 and the top seat 16 away from the drilling position; after the construction is completed, the construction site can be transferred by controlling the crawler chassis 1.

[0065] like Figures 1 to 3 As shown, the supporting structure includes a crawler chassis 1, a turntable 2, a No. 1 hydraulic cylinder 3, a mounting arm 4 and a support column 5; the top surface of the crawler chassis 1 is rotatably installed with a turntable 2, and a plurality of No. 1 hydraulic cylinders 3 are evenly installed around the top surface of the turntable 2, and the piston rod end of the No. 1 hydraulic cylinder 3 is installed with a mounting arm 4, and a plurality of support columns 5 are slidably installed in the middle of the mounting arm 4, and the adjacent support columns 5 are fixed end to end; when working, after removing the concrete of the bottom plate of the dark excavation area and opening up the operating space, the crawler chassis 1 is manipulated to move to the interior of the existing structure, and the No. 1 hydraulic cylinder steel 3 pushes the mounting arm 4 to expand outward, connects and fixes the plurality of support columns 5 end to end, and installs them to the middle of the mounting arm 4; the existing structure is supported by a plurality of support columns 5, and when drilling, it is only necessary to rotate the No. 1 hydraulic cylinder 3 that hinders the drilling construction to change the supporting position of the support column 5, thereby reducing the difficulty of disassembly for the staff; after the construction is completed, it is only necessary to disassemble the support column 5 to control the crawler chassis 1 to move, thereby improving the work efficiency of the staff.

[0066] like Figures 1 to 3 As shown, the bottom of the inner cavity of the mounting arm 4 is fixedly connected with a No. 2 hydraulic cylinder 6, and the top end of the piston rod of the No. 2 hydraulic cylinder 6 is fixedly connected with a support plate 7. The top surface of the support plate 7 slides with the lower end of the bottom support column 5, and the bottom outer ring of the mounting arm 4 is evenly fixed with multiple No. 3 hydraulic cylinders 8, and the lower end of the piston rod of the No. 3 hydraulic cylinder 8 is fixedly connected with a bottom plate 9; when working, the No. 1 hydraulic cylinder 3 pushes the mounting arm 4 to expand outward, and the No. 3 hydraulic cylinder 8 pushes the bottom plate 9 to contact the ground, which not only improves the supporting strength of the support column 5, but also provides support for the turntable 2, reducing the probability of deformation and damage of the turntable 2; and provides a fixing effect for the crawler chassis 1, thereby improving the stability of the crawler chassis 1; the No. 2 hydraulic cylinder 6 pushes the support plate 7 to rise, and pushes the support column 5 to rise, thereby facilitating the staff to support positions at different heights, thereby improving the applicability of the support structure.

[0067] like Figures 1 to 3 As shown, a card slot 10 is provided at the lower end of the support column 5, and a fixing block 11 is fixedly connected to the top of the support column 5. The size of the fixing block 11 matches the size of the card slot 10. A fixing opening 12 is provided in the middle of the side wall of the fixing block 11 and the card slot 10, and a pin 13 is slidably installed inside the fixing opening 12. The top side wall of the mounting arm 4 is fixedly connected to a No. 4 hydraulic cylinder 14, and the piston rod of the No. 4 hydraulic cylinder 14 slides through the outer wall of the mounting arm 4. The end of the piston rod of the No. 4 hydraulic cylinder 14 is fixedly connected to a splint 15, and the outer wall of the splint 15 slides with the outer wall of the support column 5. During operation, when installing the support column 5, the support column 5 is placed on the top of the middle support plate 7 of the mounting arm 4, and the No. 2 hydraulic cylinder 6 pushes the support plate 7 to rise, and wait for the support column 5 to be fixed. After the bottom of 5 rises to the top of the installation arm 4, the No. 4 hydraulic cylinder 14 pushes the splint 15 to squeeze the bottom of the support column 5 to fix the support column 5, and the No. 2 hydraulic cylinder 6 drives the support plate 7 to descend, and then a support column 5 is placed on the top surface of the support plate 7. At the same time, the pin 13 is used to fix the bottom support column 5 with the adjacent top support column 5, and the No. 2 hydraulic cylinder 6 pushes the bottom support column 5 to continue to rise. At the same time, the No. 4 hydraulic cylinder 14 drives the splint 15 to release the adjacent top support column 5; repeat the connection and installation of the support column 5 many times, so that the top seat 16 is close to the top of the existing structure, and then the No. 2 hydraulic cylinder 6 pushes it so that the top seat 16 contacts the top of the existing structure to support the existing structure, thereby facilitating the staff to install and disassemble the support column 5.

[0068] like Figures 1 to 3 As shown, a top seat 16 is installed at the top of the support column 5, and a plurality of grooves are opened on the top surface of the top seat 16, and a supporting beam 17 is bolted inside the groove; by setting the top seat 16 and the supporting beam 17, the supporting area and range of the top of the existing structure are increased, the probability of collapse and falling of the top of the existing structure is reduced, and the safety of construction is improved.

[0069] like Figures 2 to 3 As shown, panels 18 are fixed on both sides of the bottom surface of the top seat 16, and a locking bolt 19 is threadedly installed on the middle part of the panel 18, and the locking bolt 19 passes through the panel 18. Slide grooves 20 are provided on both sides of the top end of the mounting arm 4, and the inner wall of the slide groove 20 slides with the outer wall of the panel 18; through the cooperation of the locking bolt 19 and the panel 18, not only the top seat 16 can be fixed to the top of the support column 5, but also the top seat 16 can be fixed to the top of the mounting arm 4, thereby facilitating the fixed installation of the top seat 16.

[0070] like Figures 1 to 4As shown, a plurality of circular grooves 21 are formed around the top surface of the turntable 2, a rotating seat 22 is rotatably mounted inside the circular groove 21, and a plurality of notches are formed around the bottom of the rotating seat 22, a wedge 23 is slidably mounted in the middle of the rotating seat 22, a rotating block 24 is fixedly connected to the top surface of the rotating seat 22, and the rotating block 24 is fixedly connected to the cylinder body of the No. 1 hydraulic cylinder 3, a screw 25 is threadedly mounted in the middle of the rotating block 24, and the lower end of the screw 25 is rotatably connected to the top surface of the wedge 23; During operation, when drilling is required, the rotating block 24 is rotated to drive the rotating seat 22 to rotate along the circular groove 21, thereby adjusting the supporting position of the support column 5; after the position adjustment of the support column 5 is completed, the screw 25 is turned to push the wedge block 23 to slide downward, squeezing the bottom surface of the circular groove 21. At the same time, the wedge block 23 pushes the rotating seat 22 to expand outward along the notch, so that the outer wall of the rotating seat 22 squeezes the inside of the circular groove 21, thereby fixing and locking the rotating block 24, reducing the probability of movement of the support column 5.

[0071] like Figures 1 to 3 As shown, the end of the piston rod of the No. 1 hydraulic cylinder 3 is fixedly connected to a mounting seat 26, and a cross bar 27 is rotatably installed in the middle of the mounting seat 26. The end of the cross bar 27 is fixedly connected to the middle of the mounting arm 4, and the top surface of the mounting seat 26 is fixedly connected to a motor 28. The outer ring of the rotating shaft of the motor 28 and the outer ring of the cross bar 27 are both fixedly connected to a gear 29, and the two gears 29 are meshed with each other. An arc groove 30 is provided on the side of the bottom of the mounting seat 26 close to the turntable 2, and the inner wall of the arc groove 30 slides with the outer ring of the turntable 2; the gear 29 is driven to rotate by the motor 28, and the meshing transmission of the gear 29 drives the mounting arm 4 to rotate, thereby storing the mounting arm 4, which is convenient for the movement of the crawler chassis 1; the arc groove 30 is provided to slide with the outer ring of the turntable 2, thereby improving the stability of the mounting arm 4 after storage, and at the same time, improving the stability of the No. 1 hydraulic cylinder 3.

[0072] Example 2

[0073] like Figure 5 As shown, compared with Example 1, another embodiment of the present invention is: a plurality of mounting grooves 31 are opened on the top surface of the support plate 7, and an insert 32 is slidably installed inside the mounting groove 31, and the insert 32 is fixed to the bottom of the support column 5 by bolts; the insert 32 is fixed to the inside of the mounting groove 31, thereby reducing the possibility of the support column 5 being shaken and displaced, thereby improving the support strength of the existing structure.

[0074] Working principle: After the drilling rig is installed in place, the first stage of drilling construction is carried out. The drilling rig stops drilling when it reaches the top of the existing structure and continues drilling after the existing structure is broken. To break the existing structure in the dark excavation area, the jackhammer first breaks the concrete of the bottom plate of the dark excavation area to create space for the supporting structure. The crawler chassis 1 is controlled to move to the inside of the existing structure. The No. 1 hydraulic cylinder steel 3 pushes the installation arm 4 to expand outward. The motor 28 drives the gear 29 to rotate. Through the meshing transmission of the gear 29, the installation arm 4 is driven to rotate, so that the installation arm 4 is in a vertical state.

[0075] After the support column 5 is lifted up, the support column 5 is lifted up and the support column 5 is placed on the top of the middle support plate 7 of the installation arm 4. The third hydraulic cylinder 8 pushes the bottom plate 9 to contact the ground, and the support column 5 is placed on the top of the middle support plate 7 of the installation arm 4. The fourth hydraulic cylinder 14 pushes the support plate 7 to rise. After the bottom of the support column 5 rises to the top of the installation arm 4, the fourth hydraulic cylinder 14 pushes the clamping plate 15 to squeeze the bottom of the support column 5 to fix the support column 5. The second hydraulic cylinder 6 drives the support plate 7 to descend, and then a support column 5 is placed on the top surface of the support plate 7. At the same time, the pin 13 is used to fix the bottom support column 5 with the adjacent top support column 5. The second hydraulic cylinder 6 pushes the bottom support column 5 to continue to rise. At the same time, the fourth hydraulic cylinder 14 drives the clamping plate 15 to release the adjacent top support column 5. Repeat the connection and installation of the support column 5 many times, so that the top seat 16 is close to the top of the existing structure, and then it is pushed by the second hydraulic cylinder 6 so that the top seat 16 contacts the top of the existing structure to support the existing structure.

[0076] Chisel away the primary concrete support at the top of the pile arch, leaving the steel bars therein; chisel away the concrete at the retaining piles and partitions, leaving the steel bars therein; chisel away the primary concrete support at the bottom of the arch within the range of the retaining piles, leaving the steel bars therein;

[0077] After the chiseling is completed, part of the supporting structure is removed, and the No. 2 hydraulic cylinder 6 drives the supporting plate 7 to descend, so that the top seat 16 is separated from the top of the existing structure. At the same time, the No. 3 hydraulic cylinder 8 drives the bottom plate 9 off the ground, rotates the rotating block 24, adjusts the supporting position of the support column 5, and then supports the existing structure. The screw 25 is turned to push the wedge block 23 to slide downward, squeezing the bottom surface of the circular groove 21. At the same time, the wedge block 23 pushes the rotating seat 22 to expand outward along the notch, so that the outer wall of the rotating seat 22 squeezes the inside of the circular groove 21, and the rotating block 24 is fixed and locked;

[0078] The drilling rig drills the hole, the casing is followed by the sinking of the pipe, the steel casing is hoisted to the designed position, the steel casing is welded to the steel bars reserved when breaking, and the concrete in the pile is poured after the welding is completed; after the construction of the retaining piles is completed, the initial concrete of other piles is broken and the retaining piles are constructed in sequence; after the arch structure is broken, the steel casing is hoisted. When hoisting, the welding ears are welded on both sides of the steel casing, and it is hoisted to the arch structure and temporarily fixed on the ground with steel bars; when the steel casing is welded on the ground, the steel casing is carried out by using No. 25 I-steel and Φ25 steel bars to prevent the steel casing from being damaged. The pile is then dropped down, and the other section of steel casing is hoisted into the air by a crane, and the two sections of steel casing are welded into one on the ground; the welded steel casing is hoisted to the designed position, and the steel casing is fixed. The exposed steel bars after the original structure is broken are welded to the steel casing, and C20 concrete is used for compaction by spraying; the lower part of the pile design position is grouting to stop water, and the drill rod retreat grouting method is adopted. Vertical drilling is carried out, and the hole is first drilled to the designed hole depth, and then the drill is lifted and grouting is carried out every 0.5m; after the steel casing is fixed, the pile body below the structure is constructed by drilling and pouring; when the hole is cleaned and the steel cage is hoisted, the pile body is poured.

[0079] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing bored piles penetrating underground structures, characterized by: The bored pile construction method comprises the following steps: S11: After the drilling rig is installed in place, the first stage of drilling construction is carried out. The drilling rig stops when it reaches the top of the existing structure and continues drilling after the existing structure is broken; S12: Demolish the existing structure in the dark excavation area. First, a jackhammer will be used to remove the concrete from the bottom slab of the dark excavation area to create space for the supporting structure, which will then be used to support the existing structure. S13: Chisel away the primary concrete supporting the arch top, leaving the steel bars therein; chisel away the concrete at the retaining piles and diaphragms with a jackhammer, leaving the steel bars therein; chisel away the primary concrete supporting the arch bottom within the retaining piles, leaving the steel bars therein; S14: After the chiseling is completed, part of the supporting structure is removed to facilitate the lowering of the steel casing. The drilling rig is used to drill the hole, and the casing is then sunk. The steel casing is hoisted to the designed position and welded to the steel bars reserved during the chiseling. After welding, the concrete in the pile is poured. After the retaining piles are installed, the initial concrete of the other piles and the retaining piles are then removed in sequence. S15: After the arch structure is broken, the steel casing is hoisted. During the hoisting process, welding lugs are performed on both sides of the steel casing. The casing is hoisted to the arch structure and temporarily fixed on the ground with steel bars. S16: When welding the steel casing on the ground, the steel casing is supported by using No. 25 I-steel and Φ25 steel bars to prevent it from falling. Then, the other section of the steel casing is hoisted into the air by a crane, and the two sections are welded together on the ground. The welded steel casing is hoisted to the designed position and fixed. The exposed steel bars after the original structure is removed are welded to the steel casing, and C20 concrete is sprayed and mixed to make it dense. S17: Grouting is performed to seal the lower part of the pile design position. Use the drill rod retreat grouting method. Drill vertically to the designed hole depth first, then raise the drill and grout every 0.5m. S18: After the steel casing is fixed, the piles below the structure are constructed by drilling and grouting; S19: After the hole is cleaned and the steel cage is hoisted, the pile body is poured.

2. The method for constructing bored piles penetrating underground structures according to claim 1, characterized in that: The support structure comprises a crawler chassis (1), a turntable (2), a No. 1 hydraulic cylinder (3), a mounting arm (4) and a support column (5); the turntable (2) is rotatably mounted on the top surface of the crawler chassis (1), a plurality of No. 1 hydraulic cylinders (3) are evenly mounted around the top surface of the turntable (2), a mounting arm (4) is mounted on the end of the piston rod of the No. 1 hydraulic cylinder (3), a plurality of support columns (5) are slidably mounted on the middle part of the mounting arm (4), and adjacent support columns (5) are fixedly connected end to end.

3. The method for constructing bored piles penetrating underground structures according to claim 2, characterized in that: A No. 2 hydraulic cylinder (6) is fixedly connected to the bottom of the inner cavity of the mounting arm (4), a supporting plate (7) is fixedly connected to the top end of the piston rod of the No. 2 hydraulic cylinder (6), the top surface of the supporting plate (7) is slidably matched with the lower end of the supporting column (5) at the bottom, a plurality of No. 3 hydraulic cylinders (8) are evenly fixedly connected to the outer ring of the bottom of the mounting arm (4), and the lower end of the piston rod of the No. 3 hydraulic cylinder (8) is fixedly connected to the bottom plate (9).

4. The method for constructing bored piles penetrating underground structures according to claim 3, characterized in that: A slot (10) is provided at the lower end of the support column (5), a fixing block (11) is fixedly connected to the top end of the support column (5), the size of the fixing block (11) matches the size of the slot (10), a fixing opening (12) is provided in the middle of the side walls of the fixing block (11) and the slot (10), a pin (13) is slidably installed inside the fixing opening (12), a No. 4 hydraulic cylinder (14) is fixedly connected to the top side wall of the mounting arm (4), the piston rod of the No. 4 hydraulic cylinder (14) slides through the outer wall of the mounting arm (4), the end of the piston rod of the No. 4 hydraulic cylinder (14) is fixedly connected to a splint (15), and the outer wall of the splint (15) is slidably matched with the outer wall of the support column (5).

5. The method for constructing bored piles penetrating underground structures according to claim 4, characterized in that: A top seat (16) is installed at the top end of the support column (5), a plurality of grooves are provided on the top surface of the top seat (16), and a supporting crossbeam (17) is bolted inside the grooves.

6. The method for constructing bored piles penetrating underground structures according to claim 5, characterized in that: Both sides of the bottom surface of the top seat (16) are fixed with panels (18), the middle part of the panel (18) is threadedly mounted with a locking bolt (19), and the locking bolt (19) passes through the panel (18), and both sides of the top end of the mounting arm (4) are provided with a sliding groove (20), the inner wall of the sliding groove (20) is slidably matched with the outer wall of the panel (18).

7. The method for constructing bored piles penetrating underground structures according to claim 6, characterized in that: The top surface of the turntable (2) is provided with a plurality of circular grooves (21), a turntable (22) is rotatably mounted inside the circular groove (21), and a plurality of notches are provided around the bottom of the turntable (22), a wedge (23) is slidably mounted in the middle of the turntable (22), a turntable (24) is fixedly connected to the top surface of the turntable (22), the turntable (24) is fixedly connected to the cylinder body of the No. 1 hydraulic cylinder (3), a screw (25) is threadedly mounted in the middle of the turntable (24), and the bottom end of the screw (25) is rotatably connected to the top surface of the wedge (23).

8. The method for constructing bored piles penetrating underground structures according to claim 7, characterized in that: The end of the piston rod of the No. 1 hydraulic cylinder (3) is fixedly connected to a mounting seat (26), a cross bar (27) is rotatably mounted in the middle of the mounting seat (26), the end of the cross bar (27) is fixedly connected to the middle of the mounting arm (4), a motor (28) is fixedly connected to the top surface of the mounting seat (26), the outer ring of the rotating shaft of the motor (28) and the outer ring of the cross bar (27) are both fixedly connected to gears (29), the two gears (29) are meshed with each other, an arc groove (30) is provided on the bottom of the mounting seat (26) near the side of the turntable (2), and the inner wall of the arc groove (30) is slidably matched with the outer ring of the turntable (2).

9. The method for constructing bored piles penetrating underground structures according to claim 8, characterized in that: The top surface of the support plate (7) is provided with a plurality of mounting grooves (31), and inserts (32) are slidably mounted inside the mounting grooves (31), and the inserts (32) are fixedly connected to the bottom of the support column (5) via bolts.

10. The method for constructing bored piles penetrating underground structures according to claim 9, characterized in that: The supporting method of the supporting structure comprises the following steps: S21: After removing the concrete of the bottom plate of the dark excavation area and opening up the operating space, the crawler chassis (1) is controlled to move to the inside of the existing structure, the No. 1 hydraulic cylinder (3) pushes the installation arm (4) to expand outward, and the No. 3 hydraulic cylinder (8) pushes the bottom plate (9) down to contact the bottom surface for support; S22: Place the support column (5) on top of the middle support plate (7) of the mounting arm (4), and the No. 2 hydraulic cylinder (6) pushes the support plate (7) upward, pushing the top seat (16) upward; S23: After the bottom of the support column (5) rises to the top of the mounting arm (4), the fourth hydraulic cylinder (14) pushes the clamping plate (15) to squeeze the bottom of the support column (5) to fix the support column (5); S24: The second hydraulic cylinder (6) drives the support plate (7) to descend, and then a support column (5) is placed on the top surface of the support plate (7). At the same time, the bottom support column (5) is fixedly connected to the adjacent top support column (5) using a pin (13); S25: The second hydraulic cylinder (6) pushes the bottom support column (5) to continue to rise, and at the same time, the fourth hydraulic cylinder (14) drives the clamping plate (15) to release the adjacent top support column (5); S26: Repeat the connection and installation of the support column (5) multiple times so that the top seat (16) is close to the top of the existing structure, and then push it through the second hydraulic cylinder (6) so that the top seat (16) contacts the top of the existing structure to support the existing structure; S27: When drilling is required, the top seat (16) is lowered by the second hydraulic cylinder (6), and the rotating block (24) is rotated to rotate the support column (5) and the top seat (16) away from the drilling position; after the construction is completed, the construction site can be transferred by controlling the crawler chassis (1).

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