A High-Efficiency Demolition Method and Special Tools for Multi-Section Steel Casings

Abstract

This invention relates to the field of steel casing demolition construction technology, specifically disclosing a high-efficiency demolition method and special tools for multi-section steel casings. The demolition method includes the following steps: after the steel pipe piles are driven, the steel casing is detached from the steel pipe piles using a rotary drilling rig; the lifting rope is connected and fixed to four connecting blocks, and a support frame is mounted on the surface of the steel casing using a crane; the rotary drilling rig drives the uppermost first section of the steel casing upwards to expose the pin hole; the rotary drilling rig rotates the steel casing to align and insert the pin with the pin hole; the connecting anchor bolts are removed, and the rotary drilling rig continues to lift, completing the demolition of a single section; the demolished steel casing is hoisted to the side and placed aside, and the above steps are repeated to demolish all steel casings section by section. In this invention, the driving mechanism automatically inserts the pin into the pin hole, enabling the crane to quickly demolish the steel casing section by section, meeting the demand for efficient and safe demolition of multi-section steel casings.

Description

Technical Field

[0001] This invention relates to the field of steel casing demolition construction technology, specifically to a high-efficiency demolition construction method and special tools for multi-section steel casings. Background Technology

[0002] In underwater construction of steel pipe piles, steel casings serve as extension sleeves to transmit torque and downward pressure. They are typically used in multiple sections joined together (usually 6 sections, each approximately 3m long, for a total length of about 18m). After the steel pipe piles are driven into place, the steel casings automatically detach from the piles, requiring the dismantling of multiple sections. Due to the high precision required for the connections between the steel casings, they cannot be dismantled horizontally (as this would easily damage the connections due to shear forces); they must be dismantled vertically. Dismantling them on the ground after hoisting them as a whole poses safety risks such as working at excessive heights and instability.

[0003] The existing dismantling method requires lifting the steel casing section by section. Each section must be temporarily secured before the next section is lifted. Then, the connecting anchor bolts and rivets are manually removed, and the steel casing is connected and secured to the hoisting mechanism. Finally, the hoisting mechanism lifts and dismantles the casing. This process is cumbersome, time-consuming, and labor-intensive. The temporary fixation is unreliable, resulting in low efficiency and high operational risks in dismantling multi-section steel casings, failing to meet the requirements for efficient and safe construction. Therefore, there is an urgent need for a multi-section steel casing dismantling method and specialized tools that are adaptable to vertical working conditions, allow for rapid positioning and fixation, and facilitate segmented dismantling. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology by proposing an efficient demolition method and special tools for multi-section steel casings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for efficient dismantling of multi-section steel casings, comprising the following steps: Step 1: After the steel pipe piles are driven into the ground, the steel casing is automatically separated from the steel pipe pile foundation by the reverse rotation of the rotary drilling rig. Step 2: Connect and fix the externally pre-set lifting ropes to the four connecting blocks at the top of the support. After the support is lifted upward by the crane, control the support to be fitted onto the surface of the steel casing. At this time, the support is placed on the operating platform. Step 3: After the rotary drilling rig is inserted into the uppermost steel casing, the rotation of the rotary drilling rig drives multiple steel casing sections to rise together until the pin hole of the next steel casing section is exposed. Step 4: Rotate the steel casing using the rotary drilling rig to align and insert the two pins on the support with the two pin holes of the next section of the steel casing, thus completing the connection and fixation between the support and the steel casing. Step 5: Remove the connecting anchor bolts between adjacent steel casings, and the rotary drilling rig continues to lift to complete the removal of a single section; Step Six: Rotate and lift the dismantled steel casing to the side and place it aside. Repeat steps one to five above to dismantle all the steel casings section by section, and complete the dismantling of multiple steel casings.

[0006] Optionally, a special tool for efficient dismantling of multi-section steel casings is provided. The dismantling tool is applicable to the dismantling construction method described above. The dismantling tool includes a bracket and two pins. Two fixing plates are installed on the top of the bracket, and two fixing rings are installed on the top of each fixing plate. The two pins are slidably installed inside the corresponding two fixing rings. Handles are detachably installed on the outside of each pin. The bottom of each fixing plate is provided with a driving mechanism for driving the handles to move the pins back and forth. The bottom end of the bracket is provided with a clamping mechanism for assisting in clamping and fixing the outer wall of the steel casing.

[0007] Optionally, all four connecting blocks are installed at the top of the four corners of the bracket, and each of the four connecting blocks has a connecting hole inside. Support plates are installed between the bottom of the two fixing plates and the bracket.

[0008] Optionally, the outer wall of the pin is provided with an annular groove, and the bottom end of the handle is provided with two semi-circular connecting plates that are adapted to the annular groove. One of the connecting plates is rotatably connected to the bottom end of the handle, and the ends of the two connecting plates away from the handle are provided with rectangular plates. The two rectangular plates are connected by two bolts threaded together.

[0009] Optionally, the top of the fixing plate is provided with a first groove that is adapted to the two rectangular plates at the center position, and the top of the fixing plate is also provided with two second grooves that are connected to the first groove. A sealing block is slidably installed inside the two second grooves.

[0010] Optionally, the driving mechanism includes two lead screws rotatably mounted on the bottom of the fixed plate. The outer walls of the two lead screws are threaded with moving blocks. The bottom of the fixed plate has two guide grooves, and guide blocks are installed inside the two guide grooves. The bottom ends of the two guide blocks are respectively connected to the corresponding moving blocks.

[0011] Optionally, a rotating plate is rotatably mounted on the opposite ends of the two movable blocks. A notch is provided at the top of each of the two rotating plates. A rotating rod is rotatably mounted inside the notch of one of the rotating plates, and the end of the rotating rod away from the rotating part is attached to the notch of the other rotating plate.

[0012] Optionally, the top of the handle is provided with a slot that matches the rotating rod, and two fixing rods are installed on the top of the fixing plate.

[0013] Optionally, the clamping mechanism includes two mounting rods and two moving rods. Both mounting rods are installed at the bottom of the bracket. Rectangular grooves are opened on the outer wall of the two mounting rods on the side that are close to each other. Double-ended screws are rotatably installed inside the two rectangular grooves. The two ends of the two moving rods are respectively threaded to the outer wall of the two double-ended screws.

[0014] Optionally, arc-shaped clamping blocks are installed on the outer walls of the two adjacent moving rods, and both clamping blocks are made of rubber material.

[0015] The beneficial effects of this invention are: 1. In this invention, when dismantling the steel casing, a drive mechanism is set up to drive the pins to move and adjust automatically. After the crane moves the support and the two pins to the designated position, the two drive mechanisms drive the two pins to automatically insert into the pin holes, so that the crane can quickly dismantle the steel casing section by section. The entire steel casing dismantling process is simple, efficient, and has low operational risk, which can meet people's construction needs for efficient and safe dismantling of multiple steel casing sections.

[0016] 2. In this invention, after the crane drive bracket is mounted on the top surface of the steel casing, the two double-headed screws are controlled to drive the two moving rods and the clamping blocks to move together in a similar direction until the two clamping blocks move close to the outer wall of the steel casing, but do not come into contact with it. Then, as the crane controls the bracket to move downward, even if the bracket shakes and the two clamping blocks collide with the outer wall of the steel casing, since both clamping blocks are made of soft rubber material, damage to the outer wall of the steel casing can be effectively avoided. The impact vibration can also be buffered simultaneously to prevent damage to the bracket itself and improve the safety of the bracket during use.

[0017] 3. In this invention, after the two driving mechanisms drive the two pins to be inserted into the corresponding pin holes inside the steel casing, the two moving rods of the clamping mechanism can be controlled to continue to move in the direction of approaching each other, so as to drive the two clamping blocks to tightly clamp the outer wall of the steel casing, thereby achieving the effect of assisting in clamping and fixing the steel casing and improving the stability during the removal of the steel casing.

[0018] 4. In this invention, the two pins are repeatedly inserted into the pin holes of the steel casing during use, which easily causes wear on their surfaces. Furthermore, the pins are subjected to significant shearing forces during the removal of the steel casing, leading to a decrease in their rigidity after a period of use. To ensure safety during subsequent removal of the steel casing, the pins need to be replaced periodically. When disassembling and replacing the pins, the rotating rod can be moved upwards from the slot, and the two rotating plates can be rotated to a horizontal position. Then, one of the sealing blocks can be moved outwards, exposing one of the second grooves. At this point, the handle can be manually driven to rotate outwards within the exposed second groove, exposing the two rectangular plates. The two bolts can then be removed to release the connection between the two rectangular plates. Then, one connecting plate can be rotated towards the other connecting plate, allowing the handle to be removed from the annular groove. This enables the old pin to be removed from the two fixing rings, achieving the effect of quickly disassembling the vulnerable pin. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of a high-efficiency demolition tool for multi-section steel casings proposed in this invention; Figure 2 This is a schematic diagram of the support structure in this invention; Figure 3 This is a schematic diagram of the bottom structure of the fixing plate in this invention; Figure 4 This is a schematic diagram of the structure in this invention where the pin is separated from the two retaining rings; Figure 5 This is a schematic diagram of the structure where the handle is disassembled in this invention; Figure 6 This is a schematic diagram of the drive mechanism in this invention; Figure 7 This is a schematic diagram of the clamping mechanism in this invention; Figure 8 This is a cross-sectional view of the structure of the two mounting rods in this invention; Figure 9 This is a schematic diagram of the structure in this invention where connecting ears are welded at the four corners of the bracket.

[0021] In the diagram: 1. Bracket; 2. Connecting block; 3. Connecting hole; 4. Fixing plate; 5. Pin; 6. Fixing ring; 7. Fixing rod; 8. Handle; 9. Rotating plate; 10. Mounting rod; 11. Moving rod; 12. Support plate; 13. Screw; 14. Guide groove; 15. Slot; 16. First groove; 17. Second groove; 18. Sealing block; 19. Connecting plate; 20. Rectangular plate; 21. Bolt; 22. Annular groove; 23. Moving block; 24. Guide block; 25. Notch; 26. Rotating rod; 27. Clamping block; 28. Rectangular groove; 29. ​​Double-ended screw. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Reference Figures 1-9 A highly efficient demolition method for multi-section steel casings, comprising the following steps: Step 1: After the steel pipe piles are driven into the ground, the steel casing is automatically separated from the steel pipe pile foundation by the reverse rotation of the rotary drilling rig. Step Two: Connect and fix the externally pre-set lifting ropes to the four connecting blocks 2 at the top of the bracket 1. After lifting the bracket 1 upwards using a crane, control the bracket 1 to be fitted onto the surface of the steel casing. At this time, the bracket 1 is placed on the operating platform; Figure 9 As shown, in order to improve the stability of the connection between the bracket 1 and the top of the operating platform, connecting ears can be welded at the four corners of the bracket 1. After the bracket 1 is placed on the top of the operating platform, the four connecting screws can be threaded through the connecting ears and threaded into the pre-set threaded holes on the top of the operating platform to ensure that the bracket 1 can be stably connected to the operating platform.

[0024] Step 3: After the rotary drilling rig is inserted into the uppermost steel casing, the rotation of the rotary drilling rig drives multiple steel casing sections to rise together until the pin hole of the next steel casing section is exposed. The rotary drilling rig drives multiple steel casing sections to rise to a height of 3m, ensuring that the pin hole of the next steel casing section is fully exposed.

[0025] Step 4: Rotate the steel casing using the rotary drilling rig to align and insert the two pins 5 on the support 1 with the two pin holes of the next section of the steel casing, thus completing the connection and fixation between the support 1 and the steel casing; when the next section of the steel casing is lifted to the tool position, insert the two pins 5 into the corresponding pin holes inside the steel casing, temporarily locking the next section of the steel casing on the operating platform to keep it suspended and fixed.

[0026] Step 5: Remove the connecting anchor bolts between adjacent steel casings (here, the connecting anchor bolts between the bottom of the upper steel casing to be lifted and dismantled and the top of the next steel casing section are removed). The rotary drilling rig continues to lift, and during the lifting process, the steel casing can be rotated to facilitate its disassembly, thus completing the dismantling of a single section. Step Six: Rotate and lift the dismantled steel casing to the side and place it aside. Repeat steps one to five above to dismantle all the steel casings section by section, and complete the dismantling of multiple steel casings.

[0027] By adopting a multi-section steel casing removal process of "lifting-temporary fixing-removal-relifting" combined with a simple pin positioning mechanism, the cumbersome manual temporary fixing operation is replaced, which significantly improves the efficiency of steel casing dismantling, reduces the safety risks of operation, and the structure is simple and the bracket 1 can be reused.

[0028] As a technical optimization of the present invention, a special tool for efficient dismantling of multi-section steel casing is provided. The special tool is applicable to the dismantling construction method described above. The special tool includes a bracket 1 and two pins 5. Two fixing plates 4 are installed on the top of the bracket 1. Two fixing rings 6 are installed on the top of each fixing plate 4. The two pins 5 are slidably installed inside the corresponding two fixing rings 6. Handles 8 are detachably installed on the outside of each of the two pins 5. The bottom of each fixing plate 4 is provided with a driving mechanism for driving the handles 8 to move the pins 5 back and forth. The bottom end of the bracket 1 is provided with a clamping mechanism for assisting in clamping and fixing the outer wall of the steel casing.

[0029] As a technical optimization of the present invention, four connecting blocks 2 are installed at the top of the four corners of the bracket 1, and each of the four connecting blocks 2 has a connecting hole 3 inside. Support plates 12 are installed between the bottom ends of the two fixing plates 4 and the bracket 1. The lifting ropes of the external crane pass through multiple connecting holes 3 and are connected to the connecting blocks 2, which facilitates the crane to lift the entire bracket 1. Support plates 12 are provided at the bottom ends of the two fixing plates 4, which can help improve the stability of the two fixing plates 4 installed on the top of the bracket 1.

[0030] As a technical optimization of the present invention, the outer wall of the pin 5 is provided with an annular groove 22, and the bottom end of the handle 8 is provided with two semi-circular connecting plates 19 that are adapted to the annular groove 22. One of the connecting plates 19 is rotatably connected to the bottom end of the handle 8, and the ends of the two connecting plates 19 away from the handle 8 are each provided with a rectangular plate 20. The two rectangular plates 20 are threadedly connected by two bolts 21. Figure 5As shown, after rotating one of the connecting plates 19 at the bottom of the handle 8 toward the other connecting plate 19, the other fixed connecting plate 19 can be placed inside the annular groove 22. Then, control one of the connecting plates 19 to rotate back to its original position, so that both connecting plates 19 are now inside the annular groove 22, and the inner walls of both connecting plates 19 are in contact with the outer wall of the pin 5. The two rectangular plates 20 are in abutting state. By using two bolts 21 to thread the two abutting rectangular plates 20 together, the handle 8 can be installed inside the annular groove 22 on the surface of the pin 5. When it is necessary to disassemble and replace the pin 5 later, the two bolts 21 can be removed to release the connection between the two rectangular plates 20. Then, control one of the connecting plates 19 to rotate toward the other connecting plate 19 again, and the handle 8 can be manually removed from inside the annular groove 22. This allows the pin 5 to be taken out from inside the two fixed rings 6, achieving the effect of disassembling and replacing the vulnerable part, the pin 5.

[0031] As a technical optimization of the present invention, a first groove 16 adapted to two rectangular plates 20 is provided at the center of the top of the fixing plate 4. Two second grooves 17 communicating with the first groove 16 are also provided at the top of the fixing plate 4. A sealing block 18 is slidably installed inside each of the two second grooves 17. The first groove 16 at the center of the top of the fixing plate 4 provides space for the back-and-forth movement and adjustment of the two rectangular plates 20 and the two bolts 21, and also provides a limiting effect on the back-and-forth movement of the pin 5. After the two rectangular plates 20 move to the position adapted to the second groove 17, by sliding the sealing block 18 outwards, the pin 5 can be rotated to drive the two rectangular plates 20 and bolts 21 to rotate outwards from inside the second groove 17, facilitating manual disassembly of the two bolts 21. Figure 4 As shown, round holes are provided on the inner bottom surfaces of the two sealing blocks 18 and the two second grooves 17. After the two sealing blocks 18 are slidably installed inside the corresponding second grooves 17, the round holes on the two sealing blocks 18 and the round holes on the inner bottom surfaces of the two second grooves 17 are aligned on the same axis. At this time, a fixing pin or other cylindrical fixing part that matches the diameter of the round hole is manually inserted into the two round holes that overlap in position, so that the two sealing blocks 18 can be limited and fixed, and the two sealing blocks 18 can be prevented from shaking or shifting during use.

[0032] As an optimized technical solution of the present invention, the driving mechanism includes two lead screws 13 rotatably mounted on the bottom of the fixed plate 4. Each lead screw 13 has a moving block 23 threaded onto its outer wall. Two guide grooves 14 are formed at the bottom of the fixed plate 4, and guide blocks 24 are installed inside each guide groove 14. The bottom ends of the two guide blocks 24 are respectively connected to the corresponding moving blocks 23. Two first motors are installed at the end of the fixed plate 4 away from the bracket 1. The output ends of the two first motors are respectively connected to one end of each of the two lead screws 13, and the two first motors are controlled by the same control system. This allows the two first motors to drive the two lead screws 13 to rotate and adjust at the bottom of the fixed plate 4 after startup, thereby driving the two moving blocks 23 to move back and forth at the bottom of the fixed plate 4.

[0033] As a technical optimization of the present invention, rotating plates 9 are rotatably mounted on the opposite ends of the two moving blocks 23. Each rotating plate 9 has a notch 25 at its top. A rotating rod 26 is rotatably mounted inside the notch 25 of one rotating plate 9, with the end of the rotating rod 26 away from the rotating part overlapping the notch 25 of the other rotating plate 9. A rubber layer is adhered to the outer wall of both rotating rods 26, preventing them from automatically disengaging from the slot 15 and notch 25 after rotation into the slot 15 and the other notch 25 due to vibration or the shaking of the bracket 1 itself, thus improving the stability of the rotating rod 26 during use.

[0034] As a technical optimization of the present invention, the top of the handle 8 is provided with a slot 15 that matches the rotating rod 26, and two fixing rods 7 are installed on the top of the fixing plate 4. Figure 1 As shown, when both rotating plates 9 are in a vertically upward position, the rotating rod 26 can be rotated towards the other rotating plate 9 to a horizontal position, so that the rotating rod 26 rotates and engages in the slot 15 at the top of the handle 8 and the notch 25 at the top of the other rotating plate 9. At this time, the two moving blocks 23 can move back and forth to adjust the two rotating plates 9, the rotating rod 26, the handle 8 and the pin 5 together, so as to achieve the effect of driving the pin 5 to move back and forth on the top of the fixed plate 4. This allows the pin 5 to be driven and adjusted by the drive mechanism during use, without the need for manual driving of the pin 5. Figure 4As shown, since two fixing rods 7 are installed at the top of the fixing plate 4, when the drive mechanism fails to operate, the rotating rod 26 is rotated upward to adjust it, so that it is removed from the notch 25 at the top of the slot 15 and the other rotating plate 9. After the two rotating plates 9 are no longer restricted, they both rotate downward. Then, one of the sealing blocks 18 can be controlled to move outward. The handle 8 can be manually controlled to drive the pin 5 to rotate outward from the inside of one of the second grooves 17. Then, the handle 8 can be manually pushed to drive the right end of the pin 5 to be inserted into the pin hole of the steel casing. At this time, the handle 8 moves to the position between one of the fixing rings 6 and the two fixing rods 7. After the handle 8 is rotated downward to drive the pin 5 to rotate synchronously, the handle 8 can abut against one of the fixing rods 7. The fixing rods 7 limit the handle 8, ensuring that even if the drive mechanism fails, the pin 5 can still be manually controlled to be inserted into the pin hole, and ensuring that the pin 5 cannot be moved outward, thus improving the applicability of the pin 5.

[0035] As an optimized technical solution of the present invention, the clamping mechanism includes two mounting rods 10 and two moving rods 11. Both mounting rods 10 are mounted on the bottom of the bracket 1. Rectangular grooves 28 are formed on the outer walls of the two mounting rods 10 on their adjacent sides. Double-ended screws 29 are rotatably mounted inside the two rectangular grooves 28. The two ends of the two moving rods 11 are threadedly connected to the outer walls of the two double-ended screws 29. A second motor is pre-installed on the outer wall of each of the two mounting rods 10. The output ends of the two second motors are connected to one end of each of the two double-ended screws 29, and both second motors are controlled by the same control system, allowing the two second motors to drive the two double-ended screws 29 to rotate together, enabling the two moving rods 11 to move towards or away from each other.

[0036] As a technical optimization of the present invention, arc-shaped clamping blocks 27 are installed on the outer walls of the two adjacent moving rods 11. Both clamping blocks 27 are made of rubber. The rubber clamping blocks 27 can increase the friction between themselves and the outer wall of the steel casing during use, and the clamping blocks 27 can also deform under greater compressive force to ensure tight contact with the outer wall of the steel casing and improve the clamping effect on the steel casing.

[0037] In this invention, when the user uses the device, the rotating plates 9 on both sides of the two fixed plates 4 are controlled to rotate upwards to a vertical state, ensuring that the two rotating plates 9 and the handle 8 are in the same straight line position. Then, the rotating rod 26 can be rotated towards the other rotating plate 9 to a horizontal state, so that the rotating rod 26 rotates and overlaps in the slot 15 at the top of the handle 8 and the notch 25 at the top of the other rotating plate 9. Then, the hoisting rope of the external crane can be connected and fixed to multiple connecting blocks 2, so that the external crane can drive the bracket 1 to be mounted on the surface of the steel casing to be removed, and with the extension and retraction of the hoisting rope, drive the bracket 1 to move to the position close to the pin hole of the steel casing, and ensure that the two pins 5 and the two pin holes on the steel casing are in the same axis position, such as... Figure 1 and Figure 6 As shown, at this time, the two lead screws 13 at the bottom of the two fixed plates 4 can be controlled to rotate together, driving the moving block 23 on the outer wall of the lead screw 13 to move towards the support 1. This in turn drives the two rotating plates 9, rotating rod 26, handle 8 and pin 5 on the two fixed plates 4 to move together, so that after the two pins 5 move towards each other, they are inserted into the two pin holes on the steel casing. This achieves the effect of automatically inserting the pins 5 into the pin holes without manual driving, thereby improving the efficiency of dismantling multiple sections of steel casing.

[0038] During the process of mounting the crane drive bracket 1 onto the surface of the steel casing, to prevent the bracket 1 from swaying and colliding with the outer wall of the steel casing due to strong winds or other reasons, which could easily damage the bracket 1 and the outer wall of the steel casing, after the crane drive bracket 1 is mounted on the top surface of the steel casing, the two double-headed screws 29 are controlled to drive the two moving rods 11 and the clamping blocks 27 to move towards each other until the two clamping blocks 27 move close to the outer wall of the steel casing but do not come into contact with it. Then, as the crane controls the bracket 1 to move downwards, even if the bracket 1 sways and the two clamping blocks 27 collide with the outer wall of the steel casing, the two clamping blocks 27 are made of soft rubber material, which can effectively prevent damage to the outer wall of the steel casing and simultaneously buffer the vibration generated by the impact, thus avoiding damage to the bracket 1 itself and improving the safety of the bracket 1 during use.

[0039] Meanwhile, after the two drive mechanisms mentioned above drive the two pins 5 to be inserted into the corresponding pin holes inside the steel casing, the two moving rods 11 can be controlled to continue moving in the direction of approach, driving the two clamping blocks 27 to tightly clamp the outer wall of the steel casing, so as to achieve the effect of assisting in clamping and fixing the steel casing and improving the stability during the removal of the steel casing.

[0040] like Figure 4As shown, since two fixing rods 7 are installed at the top of the fixing plate 4, when the drive mechanism fails to operate, the rotating rod 26 is rotated upward to adjust it, so that it is removed from the notch 25 at the top of the slot 15 and the other rotating plate 9. After the two rotating plates 9 are no longer restricted, they both rotate downward. Then, one of the fixing pins is removed, and one of the sealing blocks 18 is pushed outward. The handle 8 can be manually controlled to drive the pin 5 to rotate outward from the inside of one of the second grooves 17. Then, the right end of the pin 5 can be inserted into the pin hole of the steel casing by manually pushing the handle 8. At this time, the handle 8 moves to the position between one of the fixing rings 6 and the two fixing rods 7. After the handle 8 is rotated downward to drive the pin 5 to rotate synchronously, the handle 8 can abut against one of the fixing rods 7. The fixing rods 7 limit the handle 8, ensuring that even if the drive mechanism fails, the pin 5 can still be manually inserted into the pin hole and that the pin 5 cannot be moved outward, thus improving the applicability of the pin 5.

[0041] Furthermore, when the bracket 1 is not in use, the rotating rod 26 can be rotated upwards from the slot 15 and the notch 25 at the top of the other rotating plate 9, and then both rotating plates 9 can be rotated to a state parallel to the fixed plate 4, so that the two rotating plates 9 can be rotated and stored on both sides of the fixed plate 4 when not in use, reducing the volume of the drive mechanism and making it convenient to store the entire device.

[0042] During use, the two pins 5 are repeatedly inserted into the pin holes of the steel casing, causing their surfaces to wear easily. Furthermore, the pins 5 are subjected to significant shearing forces during the removal of the steel casing, leading to a decrease in their rigidity after a period of use. To ensure safety during subsequent removal of the steel casing, the pins 5 need to be replaced periodically. When disassembling and replacing the pins 5, the rotating rod 26 can be rotated upwards from inside the slot 15 to move out, controlling the two rotating plates 9 to rotate to a horizontal position. Then, the fixing pin on the top of one of the sealing blocks 18 can be removed, and the sealing block 18 can be manually driven into the second recess... The inside of groove 17 moves outward, exposing one of the second grooves 17. At this time, the manual can drive the handle 8 to rotate outward inside the exposed second groove 17 until the handle 8 rotates downward to a horizontal position. The two rectangular plates 20 rotate to the outside. At this time, the manual can remove the two bolts 21 to release the connection between the two rectangular plates 20. Then, control one of the connecting plates 19 to rotate towards the other connecting plate 19. The manual can then remove the handle 8 from the inside of the annular groove 22, thereby enabling the old pin 5 to be removed from the inside of the two fixing rings 6, achieving the effect of quick disassembly of the vulnerable part pin 5. Then, the new pin 5 is manually inserted into the two retaining rings 6, as follows: Figure 4 and Figure 5As shown, after rotating one of the connecting plates 19 at the bottom of the handle 8 toward the other connecting plate 19, the other fixed connecting plate 19 can be placed inside the annular groove 22. Then, control one of the connecting plates 19 to rotate back to its original position, so that both connecting plates 19 are located inside the annular groove 22, and the inner walls of both connecting plates 19 are in contact with the outer wall of the pin 5. The two rectangular plates 20 are in abutting state. By using two bolts 21 to thread the two abutting rectangular plates 20 together, the handle 8 can be installed inside the annular groove 22 on the surface of the pin 5, achieving the effect of quickly installing the handle 8 on the surface of the new pin 5, ensuring that the safety and stability of the dismantling tool are not affected after long-term use.

[0043] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for efficient demolition of multi-section steel casings, characterized in that, The demolition method includes the following steps: Step 1: After the steel pipe piles are driven into the ground, the steel casing is automatically separated from the steel pipe pile foundation by the reverse rotation of the rotary drilling rig. Step 2: Connect and fix the externally pre-set lifting rope to the four connecting blocks (2) at the top of the bracket (1). After the bracket (1) is lifted upward by the crane, control the bracket (1) to be fitted onto the surface of the steel casing. At this time, the bracket (1) is placed on the operating platform. Step 3: After the rotary drilling rig is inserted into the uppermost steel casing, the rotation of the rotary drilling rig drives multiple steel casing sections to rise together until the pin hole of the next steel casing section is exposed. Step 4: Rotate the steel casing by rotating the rotary drilling rig to align and insert the two pins (5) on the support (1) with the two pin holes of the next section of the steel casing, thus completing the connection and fixation between the support (1) and the steel casing; Step 5: Remove the connecting anchor bolts between adjacent steel casings, and the rotary drilling rig continues to lift to complete the removal of a single section; Step Six: Rotate and lift the dismantled steel casing to the side and place it aside. Repeat steps one to five above to dismantle all the steel casings section by section, and complete the dismantling of multiple steel casings.

2. A specialized tool for the efficient dismantling of multi-section steel casings, characterized in that: The demolition tool is applicable to the demolition construction method in claim 1 above, and the demolition tool includes a bracket (1) and two pins (5). Two fixing plates (4) are installed on the top of the bracket (1), and two fixing rings (6) are installed on the top of each of the two fixing plates (4). The two pins (5) are slidably installed inside the corresponding two fixing rings (6). Handles (8) are detachably installed on the outside of the two pins (5). The bottom of the two fixing plates (4) is provided with a driving mechanism for driving the handles (8) to move the pins (5) back and forth. The bottom end of the bracket (1) is provided with a clamping mechanism for assisting in clamping and fixing the outer wall of the steel casing.

3. The high-efficiency demolition tool for multi-section steel casings according to claim 2, characterized in that, The four connecting blocks (2) are installed at the top of the four corners of the bracket (1), and the four connecting blocks (2) are provided with connecting holes (3). The bottom ends of the two fixing plates (4) are each provided with a support plate (12) between the bracket (1).

4. The high-efficiency demolition tool for multi-section steel casings according to claim 2, characterized in that, The outer wall of the pin (5) is provided with an annular groove (22). The bottom end of the handle (8) is provided with two semi-circular connecting plates (19) that are adapted to the annular groove (22). One of the connecting plates (19) is rotatably connected to the bottom end of the handle (8). The ends of the two connecting plates (19) away from the handle (8) are provided with rectangular plates (20). The two rectangular plates (20) are threadedly connected by two bolts (21).

5. The high-efficiency demolition tool for multi-section steel casings according to claim 4, characterized in that, The top of the fixing plate (4) is provided with a first groove (16) that is compatible with the two rectangular plates (20). The top of the fixing plate (4) is also provided with two second grooves (17) that are connected to the first groove (16). A sealing block (18) is slidably installed inside the two second grooves (17).

6. The high-efficiency demolition tool for multi-section steel casings according to claim 2, characterized in that, The driving mechanism includes two lead screws (13) rotatably mounted on the bottom of the fixed plate (4). The outer walls of the two lead screws (13) are threaded with moving blocks (23). The bottom of the fixed plate (4) has two guide grooves (14). The interior of the two guide grooves (14) is equipped with guide blocks (24). The bottom ends of the two guide blocks (24) are respectively connected to the corresponding moving blocks (23).

7. A high-efficiency demolition tool for multi-section steel casings according to claim 6, characterized in that, Two movable blocks (23) are each rotatably mounted with a rotating plate (9) at their far ends. Both rotating plates (9) have a notch (25) at their top ends. A rotating rod (26) is rotatably mounted inside the notch (25) of one of the rotating plates (9). The end of the rotating rod (26) away from the rotating part is attached to the notch (25) of the other rotating plate (9).

8. A high-efficiency demolition tool for multi-section steel casings according to claim 7, characterized in that, The top of the handle (8) is provided with a slot (15) that is compatible with the rotating rod (26), and two fixing rods (7) are installed on the top of the fixing plate (4).

9. A high-efficiency demolition tool for multi-section steel casings according to claim 2, characterized in that, The clamping mechanism includes two mounting rods (10) and two moving rods (11). The two mounting rods (10) are both installed at the bottom of the bracket (1). A rectangular groove (28) is opened on the outer wall of the two mounting rods (10) that are close to each other. A double-ended screw (29) is rotatably installed inside the two rectangular grooves (28). The two ends of the two moving rods (11) are respectively threaded to the outer wall of the two double-ended screws (29).

10. A high-efficiency demolition tool for multi-section steel casings according to claim 9, characterized in that, Both of the two moving rods (11) have arc-shaped clamping blocks (27) installed on the outer wall of their adjacent sides. Both clamping blocks (27) are made of rubber material.

Images