Floor type double-rocker-arm derrick for electric power iron tower and construction method

Abstract

The invention discloses a floor type double-rocker-arm derrick for an electric iron tower and a construction method. The double-rocker-arm derrick comprises a mounting base, a derrick body assembly is arranged on the mounting base, the outside of the derrick body assembly is sleeved with a jacking sleeve frame, a mast is arranged above the derrick body assembly, and a mast cap is arranged at the top of the mast; the two sides of the upper portion of the mast body assembly are respectively provided with a lifting suspension arm, and a variable-amplitude rope and a safety rope are arranged between the lifting suspension arms and the upper end of the mast. A step-by-step mounting method is adopted, and accurate measurement calibration and hydraulic jacking technologies are combined, so that accurate and stable erection of the derrick and construction safety and adaptability are ensured; in the dismantling process, through strict stress monitoring and rope system control, the high-altitude operation risk is reduced; according to the whole scheme, efficient, safe and convenient electric iron tower construction is achieved, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a method for disassembling and assembling a gin pole, and particularly to a floor-type double-jib gin pole for a power transmission tower and a construction method thereof, belonging to the technical field of electric power construction. Background Art

[0002] In the construction and demolition operations of power transmission towers, the gin pole is a key hoisting device. Traditional gin poles have deficiencies in terms of structural stability, operation convenience, and construction efficiency. For example, the jacking structure of some gin poles is complex, time-consuming for installation and disassembly, and prone to tilting and instability during jacking; its balance during hoisting operations is poor, making it difficult to meet the precise hoisting and installation requirements of large power transmission tower components; in addition, the existing gin pole construction methods lack systematicness and standardization, resulting in high safety risks during construction and difficult to guarantee construction quality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art and provide a floor-type double-jib gin pole for a power transmission tower and its construction method, improving the stability, operation convenience, and construction safety of the hoisting equipment during construction, and ensuring the smooth progress of construction.

[0004] The technical solution adopted by the present invention to solve the technical problem is: A floor-type double-jib gin pole for a power transmission tower includes an installation base, a pole body assembly is arranged on the installation base, a jacking sleeve frame is sleeved outside the pole body assembly, a mast is arranged above the pole body assembly, a mast cap is arranged at the top of the mast, lifting jibs are respectively arranged on both sides of the upper part of the pole body assembly, and a luffing rope and a safety rope are arranged between the lifting jibs and the upper end of the mast.

[0005] The pole body assembly is composed of multiple standard sections, and adjacent standard sections are fixed by a double connection structure of high-strength bolts and positioning pins.

[0006] A hydraulic jacking cylinder is installed on the jacking sleeve frame, one end of the hydraulic jacking cylinder is hinged to the inner side of the jacking sleeve frame, and the other end of the hydraulic jacking cylinder is connected to the top of the pole body assembly through a connector.

[0007] Multiple fixed pulley groups are arranged on the mast cap for guiding the luffing rope and the safety rope.

[0008] The lifting jib is composed of multiple telescopic arm sections, and adjacent arm sections are driven to expand and contract by a hydraulic telescopic cylinder. The root of the lifting jib is hinged to the pole body assembly through a rotary hinge seat.

[0009] A hook is arranged at the end of the lifting jib.

[0010] A construction method for a floor-type double-jib gin pole of a power transmission tower, comprising the following steps: S1. Construction preparation ①. Assembly of the chassis foundation: First, lay a layer of steel plate boxes, and then lay two layers of roadbed plank sleepers on the steel plate boxes to form a stable structure. Then, lay another layer of roadbed planks as the base platform; ②. Dig drainage ditches and water storage ponds around the construction area to ensure smooth drainage; and raise the height at the position of the crossbeam connecting beam with water-proof sandbags; ③. Positioning and installation of the winch: Place the winch on the side of the main hoisting surface and anchor it to the edge of the floating box hoist, making it 3 meters away from the edge of the floating box. Ensure that the ground where the winch is located is flat before installation; ④. Setting of the floating box anchor pile: Set anchor piles at the positions corresponding to the floating boxes in the lake as the winch anchoring points to provide a stable force-bearing foundation for the winch and prevent the winch from shifting during the traction operation; ⑤. Assembly and connection of the floating boxes: Use assembled floating boxes as the waterborne mobile construction platform. U-shaped circular grooves are welded on the sides and upper and lower parts of each floating box monomer. By inserting the matching pins into the U-shaped circular grooves, the floating box monomers can be quickly assembled or disassembled; S2. Installation of the gin pole base ①. Assemble the chassis foundation and install it at the center of the foundation; ②. Measure the levelness of the base with a theodolite and a spirit level to ensure that the verticality after the erection of the sleeve frame meets the requirements; ③. After the installation of the chassis, install the pulleys at the required positions as required; ④. Firmly connect the gin pole foundation base plate to the chassis foundation. After the installation of the gin pole foundation base plate, connect the four-corner anchoring guy wires; S3. Installation of the jacking sleeve frame and guy wires ①. Install a hoisting pulley at the position of the first horizontal iron of the tower and fix it with high-strength bolts; ②. Use the hoisting pulley for auxiliary hoisting, smoothly install the hydraulic jacking sleeve frame onto the base, and check that the opening direction of the sleeve frame is consistent with the traction direction; ③. Install the hydraulic operation console at a position convenient for operation and away from the hoisting area; ④. Assemble the main body of the sleeve frame, hoist the main body of the sleeve frame onto the base, adjust the distance between the roller of the sleeve frame and the standard section, and finally connect and fix the sleeve frame to the base; ⑤. After the installation of the main body of the sleeve frame, install the jacking oil cylinder, lifting frame assembly, and guardrail assembly in sequence. After completion, install the jacking mechanism assembly, jacking bearing platform, upper and lower walkways, and suspension rod assembly; ⑥. After installing the components in step ⑤, fix the guy wires; Set the sleeve frame guy wires with steel wire ropes and adjust the tension with a hand winch; S4. Installation of Mast, Reinforced Standard Sections: ①. Place the tapered section of the mast tower top steadily on the introduction trolley of the rod section moving slide rail, and slowly push it into the center position inside the sleeve using the traction device, and recheck the alignment accuracy. ②. Start the hydraulic system and lift the jacking rod at a uniform speed. When it is lifted to a height where a standard section is vacated below, pause the jacking and lock the hydraulic system. ③. Place the reinforced standard section on the introduction trolley of the introduction platform, smoothly push it into the sleeve from the lower part along the slide rail, and align it with the tapered section of the tower top; slowly lower the jacking rod to accurately dock the standard section with the tapered section of the tower top, and pre-tighten the bolts in a diagonal cross order to ensure uniform gaps; after completely lowering the jacking rod, use a torque wrench to re-tighten the bolts. ④. Repeat the above jacking steps to successively introduce and install the remaining 7 reinforced standard sections; for every 2 standard sections installed, use 4 groups of 35 pin shafts to penetrate the preset pin holes and install split pins to fix them to ensure reliable pin shaft connection. S5. Jacking and Slewing Mechanism: ①. Place the slewing bearing flat on a stable platform and align and install it with the upper support and the lower support respectively. ②. Steadily hoist the assembled slewing mechanism onto the introduction trolley, and after fixing it firmly, push it into the center position inside the sleeve along the slide rail. ③. Operate the hydraulic cylinder to retract and slowly lower the standard section of the mast tower top. When the distance between the lower end face of the standard section and the upper end face hole of the slewing mechanism is 2 cm, pause, initially align the hole positions by means of auxiliary positioning pins or pre-piercing bolts, and insert some bolts to fix the relative positions. ④. Continue to retract the cylinder to make the standard section fully fit with the end face of the slewing mechanism. After tightening the bolts in place, the slewing mechanism jacking work can be carried out. S6. Jacking of Transition Section and Standard Section: ①. After completing the jacking of the slewing mechanism, successively hoist the transition section and the reinforced standard section; operate the hydraulic system to slowly jack, and the jacking height each time should be appropriate to introduce the standard section; continuously jack until the lower support of the slewing mechanism exceeds the top of the sleeve, and ensure that the vertical distance from the jib slewing mechanism to the sleeve guy wire ≤ 18 m. ②. When the lower support tops over the top of the sleeve, immediately install the upper guy wire of the jib; when jacking the jib, the upper guy wire should be in a loose state, and after the jacking is completed, tighten them respectively; the included angle of the upper guy wire of the jib with the ground shall not be greater than 65°. ③. After the upper guy wire of the jib is tightened and the structure is stable, install the leading beam guide pulley at the specified position of the transition section, fix it with high-strength bolts, and check the rotation flexibility and installation firmness of the pulley. S7. Hoisting of Jib: ① Assemble the boom head section, boom standard section and boom root section on the ground and fasten them with bolts to ensure that the boom is symmetrically arranged on both sides of the hydraulic jacking frame along the line or transverse line direction, and the boom head section faces the frame; ②. Lead the two traction ropes through the steering pulley at the bottom of the frame, the guide pulley of the transition section, the holding rod and the center of the slewing mechanism, the pulley at the top of the mast, and finally to the boom hanging point pulley, then turn back and fix them, and connect the rope head at the bottom of the frame to the capstan; ③. Start the capstan and synchronously lift the boom symmetrically to the height of the upper support of the boom, and fix the boom root and the upper support connection seat through the φ45 pin shaft; the old tower can also be used for auxiliary lifting, and the lifting point wire rope is fixed at the connection between the first and second sections of the boom standard section, and the control rope is set at the connection between the second and third sections; the boom lifting is kept synchronous throughout the whole process. After the lifting is completed, the boom and the mast are temporarily fixed with ropes to ensure the stability of the structure; S8. Lifting and heightening of the pole: ①. Confirm that the boom cantilever height is less than 18m, pre-loosen the four grinding wire ropes, level the boom and lower the hook to the ground; remove the 35 pin between the lowest standard section in the frame and the foundation base; if the boom cannot be leveled after hoisting, use a chuck to anchor the two heaving ropes to the first standard section of the frame, temporarily fix the rocker arm, and then loosen the grinding wire rope; ②. Pull wire adjustment: moderately loosen the four sets of upper pull wires on the pole, and gradually loosen them as the lifting progresses to ensure the stability of the pole; ③. Climbing claws in place: Pull up the climbing claws of the jacking platform to make them support the standard section steps and keep them level, providing a support point for jacking; ④. Synchronous jacking: Start the hydraulic cylinder system, and the dual cylinders work synchronously to ensure that the jacking platform is level, control the gap between the guide roller and the tower body to be 3mm and the gap between each roller is consistent to avoid jacking deviation; ⑤. Standard section hoisting: While lifting, place the new standard section on the introduction trolley of the rod section moving slide rail through motorized capstan hoisting or manual handling, and prepare for installation; ⑥. Installation of standard section: When the top of the standard section in the sleeve frame rises 20mm above the new standard section, stop and push the new standard section into the sleeve frame; retract the cylinder to make the end faces of the two standard sections fit together, use 4 sets of 35 pins to complete the connection and tighten the bolts; ⑦. Repeat the above steps to install the remaining standard sections in sequence. After each section is completed, pull out the introduction trolley, lower the standard section to the base, and loosen the climbing claw. After reaching the predetermined height, install the waist ring and tie the pull wire. After all standard sections are installed, retract the cylinder, tighten the bolts of the foundation base and the tower body standard section, and complete a jacking operation. S9. Installation of safety rope and luffing rope ①. Installation of safety rope: Connect the two ends of the safety rope to the boom head and the top of the mast through the shackles, and slowly level the boom; ② Installation of the luffing rope: After the boom is installed, remove the movable pulley on the boom and use the original boom towing rope as the luffing wire rope. Release the rope end of the luffing wire rope from the pulley block at the top of the mast, and wind it back and forth at a 6-fold rate between the pulley block at the top of the mast and the pulley block at the boom tip. Fix the rope end to the working hole at the top of the mast with a wedge rope clip, and fasten the rope tail with no less than 3 rope clamps. The distance between the rope clamps is ≥6 times the diameter of the wire rope and the U-shaped ring is pressed on the short rope side. ③ Installation of the hoisting rope: Wind the two hoisting wire ropes at a 4-fold rate. The rope ends pass through the steering pulley at the bottom of the sleeve, the guiding pulley of the transition section leading beam, the center of the gin pole, the guiding pulley above the slewing mechanism, and the guiding pulley at the connection between the boom root and the slewing mechanism in sequence. Lead it along the lower plane of the boom to the pulley block at the boom tip, pass through the single pulley above the hook, the pulley block at the boom tip, and the double pulley below the hook, and finally fix it to the working hole at the boom tip with a special fixture. The rope tail is also fixed with no less than 3 rope clamps. Lead the hoisting rope at the steering pulley at the bottom of the sleeve to the winch. S10 Installation of the waist ring ① Assemble the rollers to the half-frame of the waist ring and connect the two half-frames with high-strength bolts, washers and nuts. ② Adjust the vertical position of the waist ring, install the guy wire and the anti-settlement guy wire, make the rollers in all directions closely adhere to the main chord of the derrick. After confirming that the position is correct, tighten the bolts and tighten the guy wire. S11 Removal of the cross arm ① Bind the lifting point rope to the center of gravity position in the middle section of the cross arm. After lifting, first remove the high-position side, then the low-position side, and finally remove the remaining ground wire cross arm, and use the gin pole for overall removal. ② Control the distance between the tower component and the iron tower through the lead line rope and the pulley block. Pause the lowering when the lifted component is 1 meter away from the platform. After the ground personnel control the landing position, slowly lower it to the predetermined position. S11 Removal of the tower body ① Before the lifted component detaches from the tower body, monitor the force balance on both sides of the swing arm gin pole in real time. Tighten the root control rope during the descent. Pause the traction after the binding point of the lifted component detaches from the tower body. ② During the descent, the on-site commander controlling the rope uses the winch for fine adjustment to keep the distance between the lifted component and the tower body >100 mm. Pause when the lifted component is 1 meter away from the platform. Guide it to the predetermined position by the ground personnel and slowly land it. ③ Gradually lower the height of the swing arm gin pole as the tower body is removed. After the iron tower is completely removed, then remove the gin pole mast and the tower body structure in sequence. S12 Removal of the boom ① Place the hook on the ground for fixation, remove the fixed end of the hoisting rope at the boom tip, and separate the hook from the gin pole. ② Release the wire rope through the rotating pulley at the top of the tower and fix it to the boom. Take in the rope to make the anti-collision block at the top of the tower contact the boom section. Repeat the operation to fix the double boom and the top of the tower as a whole. Finally, tighten the hoisting rope and fix the hook to the boom tip. S13. Demolition of Standard Sections: ①. Remove the connecting bolts between the bottommost standard section inside the slewing frame and the foundation base, extend the hydraulic cylinder without load to the position of the second standard section, and pull up the climbing claws to hold against the steps. ②. Lift the lifting mast to about 20 mm above the ground, push the introduction trolley to below the bottommost standard section, and remove the connection between the bottommost and the second standard sections. ③. Retract the cylinder so that the second standard section contacts the foundation base, completing the demolition of one standard section. S14. Lifting Mast Height Adjustment and Guy Wire Control ①. Guy wire adjustment: When the lifting mast is lifted or lowered, synchronously pay out or tighten the upper guy wire to ensure that the lifting mast is always in a protected state. ②. Waist ring treatment: During the process of removing the standard sections, gradually remove the waist ring guy wires, but do not remove the waist ring structure temporarily to maintain the temporary support for the lifting mast. S15. Demolition of the Mast and Reinforcement Sections ①. Lift the mast with the same traction system as during installation, remove the connecting bolts between the transition section and the upper standard section, and start the winch to lower the mast to the ground. ②. Gradually remove the transition section and the above - reinforcement standard sections through the hydraulic slewing frame. The operation steps are the same as those for removing the standard sections.

[0011] The positive and beneficial effects of the present invention are as follows: 1. In the present invention, the rod body assembly adopts a double - connection structure of high - strength bolts and positioning pins, enhancing the overall structural stability and connection reliability of the lifting mast, and can effectively withstand various loads during hoisting operations. The design of the slewing frame in cooperation with the hydraulic lifting cylinder realizes the stable and precise lifting of the lifting mast. Moreover, during the lifting process, through the reasonable control of each component, the verticality and stability of the lifting mast are ensured, reducing the construction risk.

[0012] 2. The present invention uses the fixed pulley group on the mast cap to guide the luffing rope and the safety rope, optimizing the force condition of the ropes and improving the safety and reliability of hoisting operations. The multi - section telescopic structure of the hoisting boom and the driving mode of the hydraulic telescopic cylinder enable the boom to flexibly adjust its length according to different hoisting requirements, expanding the hoisting operation range.

[0013] 3. In the present invention, through the systematic layout and installation of the chassis foundation, drainage facilities, winch, floating box, etc. during the construction preparation stage, a foundation is laid for the stable installation and safe operation of the subsequent lifting mast. The entire construction method is systematic and standardized, with each step closely connected, which can effectively improve the construction efficiency, reduce mistakes and potential safety hazards during the construction process, and ensure the smooth progress of the construction of the power transmission tower.

[0014] 4. The installation steps of each component of the gin pole of the present invention are detailed and reasonable. Through precise measurement, positioning, and connection operations, the accuracy and quality of the gin pole installation are ensured; in key links such as jacking and hoisting, a variety of control measures are adopted, such as the adjustment of guy wires and the precise control of the hydraulic system, etc., to ensure the safety and stability of the construction process.

[0015] 5. During the removal process of the cross arm and the tower body of the present invention, through measures such as monitoring the force balance and precisely controlling the movement trajectory of the lifted component, the occurrence of safety accidents such as collisions is effectively avoided, ensuring the safety of construction personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the swing gin pole of the present invention; Figure 2 is a schematic diagram of the hoisting structure of the lifting arm of the present invention; Figure 3 is a schematic diagram of the installation of the internal guy wires of the gin pole of the present invention; Figure 4 is a construction flow chart of the present invention; Wherein: 1 - installation base, 2 - pole body assembly, 3 - jacking sleeve, 4 - hydraulic jacking cylinder, 5 - mast, 6 - lifting boom, 7 - luffing rope, 8 - safety rope, 9 - hook. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further explained and described below with reference to the accompanying drawings: Example 1, referring to Figure 1 , a floor-mounted double-swing gin pole for a power transmission tower, comprising an installation base 1, on which a pole body assembly 2 is provided, an outer jacking sleeve 3 is sleeved on the pole body assembly 2, a mast 5 is provided above the pole body assembly 2, a mast cap is provided at the top of the mast 5, lifting booms 6 are respectively provided on both sides of the upper part of the pole body assembly 2, and luffing ropes 7 and safety ropes 8 are provided between the upper ends of the lifting booms 6 and the mast 5.

[0018] The pole body assembly 2 is composed of a plurality of standard sections, and adjacent standard sections are fixed by a double-connection structure of high-strength bolts and positioning pins.

[0019] A hydraulic jacking cylinder 4 is installed on the jacking sleeve 3, one end of the hydraulic jacking cylinder 4 is hinged to the inner side of the jacking sleeve 3, and the other end of the hydraulic jacking cylinder 4 is connected to the top of the pole body assembly 2 through a connector.

[0020] A plurality of fixed pulley groups are provided on the mast cap for guiding the luffing ropes 7 and the safety ropes 8.

[0021] The lifting boom 6 is composed of multiple telescopic boom sections. The adjacent boom sections are driven to extend and retract by hydraulic telescopic cylinders. The root of the lifting boom 6 is hinged to the rod body assembly 2 through a rotary hinge seat.

[0022] A hook 9 is provided at the end of the lifting boom 6.

[0023] Embodiment 2, A construction method for a floor-mounted double swing arm gin pole of a power transmission tower, includes the following steps: S1. Construction preparation ①. Assembly of the chassis foundation: First, lay a layer of steel plate boxes, and then lay two layers of roadbed plate sleepers on the steel plate boxes to form a stable structure. Then lay another layer of roadbed plates as the base platform; ②. Dig drainage ditches and water storage ponds around the construction area to ensure smooth drainage; and use water-blocking sandbags to raise the height at the position of the cross beam connecting beam; ③. Positioning and installation of the winch: Place the winch on the side of the main hoisting surface and anchor it to the edge of the floating box hoist, making it 3 meters away from the edge of the floating box. Ensure that the ground where the winch is located is flat before installation; ④. Setting of the floating box anchor pile: Set anchor piles at the positions corresponding to the floating boxes in the lake as the winch anchoring points to provide a stable force-bearing foundation for the winch and prevent the winch from shifting during the traction operation; ⑤. Assembly and connection of the floating boxes: Use assembled floating boxes as the waterborne mobile construction platform. U-shaped circular grooves are welded on each side and the upper and lower parts of each floating box monomer. By inserting the matching pins into the U-shaped circular grooves, the floating box monomers can be quickly assembled or disassembled; S2. Installation of the gin pole base: ①. Assemble the chassis foundation and install it at the center of the foundation; ②. Measure the levelness of the base with a theodolite and a spirit level to ensure that the verticality meets the requirements after the sleeve frame is erected; ③. After the chassis is installed, install the pulleys at the required positions as required; ④. Firmly connect the gin pole foundation bottom plate to the chassis foundation. After the gin pole foundation bottom plate is installed, connect the four-corner anchor guy wires; S3. Installation of the jacking sleeve frame and guy wires: ①. Install a hoisting pulley at the position of the first horizontal iron of the tower and fix it with high-strength bolts; ②. Use the hoisting pulley for auxiliary hoisting, smoothly install the hydraulic jacking sleeve frame onto the base, and check that the opening direction of the sleeve frame is consistent with the traction direction; ③. Install the hydraulic operation console at a position that is convenient for operation and far from the hoisting area; ④. Assemble the main body of the sleeve frame, hoist the main body of the sleeve frame onto the base, adjust the distance between the roller of the sleeve frame and the standard section, and finally connect and fix the sleeve frame to the base; ⑤. After the installation of the main body of the sleeve frame is completed, install the jacking oil cylinder, lifting frame assembly, and guardrail assembly in sequence. After completion, install the jacking mechanism assembly, jacking bearing platform, upper and lower walkways, and suspension rod assembly; ⑥. After installing the components in step ⑤, fix the guy wire; set the sleeve frame guy wire with steel wire rope and adjust the tension with a hand winch; S4. Installation of the mast and reinforced standard sections: ①. Place the tapered section of the mast top steadily on the introduction trolley of the rod section moving slide rail, and slowly push it into the center position inside the sleeve frame using the traction device, and recheck the alignment accuracy; ②. Start the hydraulic system and lift the jacking rod at a uniform speed. When it is lifted to a height where a standard section is vacated below, pause the jacking and lock the hydraulic system; ③. Place the reinforced standard section on the introduction trolley of the introduction platform, smoothly push it in from the lower part of the sleeve frame along the slide rail, and align it with the tapered section of the tower top; slowly lower the jacking rod to accurately dock the standard section with the tapered section of the tower top, and pre-tighten the bolts in a diagonal cross sequence to ensure uniform gaps; after completely lowering the jacking rod, use a torque wrench to re-tighten the bolts; ④. Repeat the above jacking steps to introduce and install the remaining 7 reinforced standard sections in sequence; for every 2 standard sections installed, use 4 groups of 35 pin shafts to penetrate the preset pin holes and install split pins to fix them to ensure reliable pin shaft connection; S5. Jacking and slewing mechanism: ①. Place the slewing bearing flat on a stable platform and align and install it with the upper support and lower support respectively; ②. Steadily hoist the assembled slewing mechanism onto the introduction trolley, and after fixing it firmly, push it into the center position inside the sleeve frame along the slide rail; ③. Operate the hydraulic cylinder to retract, and slowly lower the standard section of the mast top. When the distance between the lower end face of the standard section and the upper end face hole of the slewing mechanism is 2 cm, pause, and initially align the hole positions by means of positioning pins or pre-piercing bolts, and insert some bolts to fix the relative positions; ④. Continue to retract the cylinder to make the standard section fully fit with the end face of the slewing mechanism. After tightening the bolts in place, the slewing mechanism jacking work can be carried out; S6. Jacking of the transition section and standard section: ①. After completing the jacking of the slewing mechanism, hoist the transition section and the reinforced standard section in sequence; operate the hydraulic system to slowly jack, and the jacking height each time should be appropriate to meet the introduction of the standard section; continue to jack until the lower support of the slewing mechanism exceeds the top of the sleeve frame, and ensure that the vertical distance from the mast slewing mechanism to the sleeve frame guy wire ≤ 18 m; ②. When the lower support tops over the top of the sleeve frame, immediately install the upper guy wire of the mast; when jacking the mast, the upper guy wire should be in a loose state, and after the jacking is completed, tighten them respectively; the included angle of the upper guy wire of the mast with the ground shall not be greater than 65°; ③. After the pull wire on the holding pole is tightened and the structure is stable, install the guide pulley of the lead-out beam to the specified position of the transition section, fix it with high-strength bolts, and check the rotation flexibility and installation firmness of the pulley; S7. Hoisting of the boom: ① Assemble the boom head section, boom standard section and boom root section on the ground and fasten them with bolts to ensure that the boom is symmetrically arranged on both sides of the hydraulic jacking frame along the line or transverse line direction, and the boom head section faces the frame; ②. Lead the two traction ropes through the steering pulley at the bottom of the frame, the guide pulley of the transition section, the holding rod and the center of the slewing mechanism, the pulley at the top of the mast, and finally to the boom hanging point pulley, then turn back and fix them, and connect the rope head at the bottom of the frame to the capstan; ③. Start the capstan and synchronously lift the boom symmetrically to the height of the upper support of the boom, and fix the boom root and the upper support connection seat through the φ45 pin shaft; the old tower can also be used for auxiliary lifting, and the lifting point wire rope is fixed at the connection between the first and second sections of the boom standard section, and the control rope is set at the connection between the second and third sections; the boom lifting is kept synchronous throughout the whole process. After the lifting is completed, the boom and the mast are temporarily fixed with ropes to ensure the stability of the structure; S8. Lifting and heightening of the pole: ①. Confirm that the boom cantilever height is less than 18m, pre-loosen the four grinding wire ropes, level the boom and lower the hook to the ground; remove the 35 pin between the lowest standard section in the frame and the foundation base; if the boom cannot be leveled after hoisting, use a chuck to anchor the two heaving ropes to the first standard section of the frame, temporarily fix the rocker arm, and then loosen the grinding wire rope; ②. Pull wire adjustment: Appropriately loosen the four sets of upper pull wires on the pole, and gradually loosen them during the subsequent lifting process to ensure the stability of the pole; ③. Climbing claws in place: Pull up the climbing claws of the jacking platform to make them support the standard section steps and keep them level, providing a support point for jacking; ④. Synchronous jacking: Start the hydraulic cylinder system, and the dual cylinders work synchronously to ensure that the jacking platform is level, control the gap between the guide roller and the tower body to be 3mm and the gap between each roller is consistent to avoid jacking deviation; ⑤. Standard section hoisting: While lifting, place the new standard section on the introduction trolley of the rod section moving slide rail through motorized capstan hoisting or manual handling, and prepare for installation; ⑥. Installation of standard section: When the top of the standard section in the sleeve frame rises 20mm above the new standard section, stop and push the new standard section into the sleeve frame; retract the cylinder to make the end faces of the two standard sections fit together, use 4 sets of 35 pins to complete the connection and tighten the bolts; ⑦. Repeat the above steps to install the remaining standard sections in sequence. After each section is completed, pull out the introduction trolley, lower the standard section to the base, and loosen the climbing claw. After reaching the predetermined height, install the waist ring and tie the pull wire. After all standard sections are installed, retract the cylinder, tighten the bolts of the foundation base and the tower body standard section, and complete a jacking operation. S9. Installation of Safety Rope and Luffing Rope ①. Installation of safety rope: Connect both ends of the safety rope to the boom head and the top of the mast respectively through shackles, and slowly lower the boom flat; ②. Installation of luffing rope: After the boom is installed, remove the movable pulley on the boom, and use the original boom towing rope as the luffing steel wire rope; Release the rope end of the luffing steel wire rope from the pulley block at the top of the mast, and wind it back and forth 6 times between the pulley block at the top of the mast and the pulley block at the boom head; Fix the rope end to the working hole at the top of the mast with a wedge rope clip, and fasten the rope tail with no less than 3 rope clamps. The distance between the rope clamps is ≥6 times the diameter of the steel wire rope and the U-shaped ring is pressed on the short rope side; ③. Installation of hoisting rope: Wind the two hoisting steel wire ropes 4 times, and the rope ends pass through the turning pulley at the bottom of the sleeve, the guiding pulley of the transition section leading beam, the center of the gin pole, the guiding pulley above the slewing mechanism, and the guiding pulley at the connection between the boom root and the slewing mechanism in sequence; Lead it along the lower plane of the boom to the boom head pulley block, pass through the single pulley above the hook, the boom head pulley block, and the double pulley below the hook, and finally fix it to the working hole at the boom head with a special fixture. The rope tail is also fixed with no less than 3 rope clamps; Lead the hoisting rope at the turning pulley at the bottom of the sleeve to the winch; S10. Installation of Waist Ring ①. Assemble the roller to the half-frame of the waist ring, and connect the two half-frames with high-strength bolts, washers and nuts; ②. Adjust the up and down position of the waist ring, install the guy wire and anti-settlement guy wire, make the rollers in all directions closely adhere to the main chord of the derrick, and after confirming that the position is correct, tighten the bolts and tighten the guy wire; S11. Removal of Cross Arm ①. Bind the lifting rope to the center of gravity position in the middle section of the cross arm. After lifting, first remove the high-position side, then the low-position side, and finally remove the remaining ground wire cross arm, and use the gin pole for overall removal; ②. Control the distance between the tower components and the iron tower through the lead line and pulley block. Pause the descent when the lifted component is 1 meter away from the platform, and slowly lower it to the predetermined position after the ground personnel control the landing position; S11. Removal of Tower Body ①. Before the lifted component detaches from the tower body, monitor the force balance on both sides of the swing arm gin pole in real time. Tighten the root control rope during descent, and pause the traction after the binding point of the lifted component detaches from the tower body; ②. During the descent, the on-site commander controls the rope personnel to fine-tune through the winch to keep the distance between the lifted component and the tower body >100mm; Pause when the lifted component is 1 meter away from the platform, and slowly land it to the predetermined position under the guidance of the ground personnel; ③. Gradually lower the height of the swing arm gin pole as the tower body is removed. After the iron tower is completely removed, then remove the gin pole mast and the tower body structure in sequence; S12. Removal of Boom ①. Place the hook on the ground for fixation, remove the fixed end of the hoisting rope at the boom tip, and separate the hook from the gin pole; ② Release the steel wire rope through the rotating pulley at the top of the tower, fix it to the boom, take in the rope so that the anti-collision block at the top of the tower contacts the boom section, repeat the operation to fix the double boom and the top of the tower as a whole, and finally tighten the lifting rope to fix the hook to the head of the boom. S13. Demolition of the standard section: ① Remove the connecting bolts between the bottommost standard section in the slewing frame and the foundation base, extend the hydraulic cylinder without load to the position of the second standard section, and pull up the climbing claws to hold against the steps. ② Lift the lifting mast to about 20 mm above the ground, push the introduction trolley to below the bottommost standard section, and remove the connection between the bottommost and the second standard section. ③ Retract the cylinder so that the second standard section contacts the foundation base to complete the demolition of one standard section. S14. Adjustment of the lifting mast height and control of the guy wires ① Adjustment of the guy wires: When the lifting mast is lifted or lowered, send out or take in the upper guy wires synchronously to ensure that the lifting mast is always in a protected state. ② Treatment of the waist rings: During the demolition of the standard sections, gradually remove the waist ring guy wires, but do not remove the waist ring structure temporarily to maintain the temporary support for the lifting mast. S15. Demolition of the mast and the strengthened section ① Lift the mast with the same traction system as during installation, remove the connecting bolts between the transition section and the upper standard section, and start the winch to lower the mast to the ground. ② Gradually remove the transition section and the above strengthened standard sections through the hydraulic slewing frame, and the operation steps are the same as those for the demolition of the standard sections.

[0024] The present invention adopts a step-by-step installation process, combines precise measurement and calibration with hydraulic lifting technology to ensure the accurate and stable erection of the lifting mast, improve construction safety and adaptability; during the demolition process, through strict force monitoring and rope system control, the risk of high-altitude operations is reduced; the overall solution realizes the high efficiency, safety and convenience of the construction of the power transmission tower, effectively improves the construction quality and efficiency, and reduces the construction cost and potential safety hazards.

Claims

1. A floor-mounted double-jib gin pole for a transmission tower, comprising a mounting base (1), characterized in that: A rod assembly (2) is provided on the installation base (1). A jacking sleeve frame (3) is sleeved outside the rod assembly (2). A mast (5) is provided above the rod assembly (2). A mast cap is provided at the top of the mast (5). Lifting jibs (6) are respectively provided on both sides of the upper part of the rod assembly (2). A luffing rope (7) and a safety rope (8) are provided between the upper ends of the lifting jibs (6) and the mast (5).

2. The floor-mounted double swing arm gin pole for a power transmission tower according to claim 1, wherein: The rod assembly (2) is composed of multiple standard sections. Adjacent standard sections are fixed by a double connection structure of high-strength bolts and positioning pins.

3. The double-jib gin pole for electric power tower according to claim 1, wherein: A hydraulic jacking cylinder (4) is installed on the jacking sleeve frame (3). One end of the hydraulic jacking cylinder (4) is hinged to the inner side of the jacking sleeve frame (3), and the other end of the hydraulic jacking cylinder (4) is connected to the top of the rod assembly (2) through a connector.

4. The floor-mounted double-jib gin pole for a transmission tower according to claim 1, characterized in that: Multiple fixed pulley groups are provided on the mast cap for guiding the luffing rope (7) and the safety rope (8).

5. The floor-mounted double swing arm gin pole for a power transmission tower according to claim 1, wherein: The lifting jib (6) is composed of multiple telescopic arm sections. The adjacent arm sections are driven to expand and contract by a hydraulic telescopic cylinder. The root of the lifting jib (6) is hinged to the rod assembly (2) through a rotary hinge seat.

6. The floor-mounted double swing arm gin pole for a power transmission tower according to claim 1, wherein: A hook (9) is provided at the end of the lifting jib (6).

7. A construction method for a floor-mounted double swing arm gin pole of a transmission tower, characterized in that, Including the following steps: S1. Construction preparation ①. Assembly of the chassis foundation: First, lay a layer of steel plate boxes, and then lay two layers of roadbed plate sleepers on the steel plate boxes to form a stable structure. Then lay a layer of roadbed plates as the base platform. ②. Dig drainage ditches and water storage ponds around the construction area to ensure smooth drainage; and use water-proof sandbags to raise the height at the position of the cross beam connecting beam. ③. Positioning and installation of the winch: Place the winch on the side of the main hoisting surface and anchor it to the edge of the floating box crane, making it 3 meters away from the edge of the floating box. It is necessary to ensure that the ground where the winch is located is flat before installation. ④. Setting of the floating box anchor piles: Set anchor piles in the lake corresponding to the position of the floating box as the anchor points for the winch to provide a stable force-bearing foundation for the winch and prevent the winch from shifting during the traction operation. ⑤. Assembly and connection of the floating boxes: Use assembled floating boxes as the waterborne mobile construction platform. U-shaped circular grooves are welded on each side and the upper and lower parts of each floating box monomer. By inserting the matching pins into the U-shaped circular grooves, the floating box monomers can be quickly assembled or disassembled. S2. Installation of the gin pole base ①. Assemble the chassis foundation and install it at the center of the foundation. ②. Use a theodolite and a spirit level to measure the levelness of the base to ensure that the verticality meets the requirements after the sleeve frame is erected. ③. After the chassis is installed, install the pulleys at the required positions according to the requirements. ④. Firmly connect the gin pole foundation base plate to the chassis foundation. After the gin pole foundation base plate is installed, connect the four-corner anchor guy wires. S3. Installation of the jacking sleeve frame and guy wires ①. Install a hoisting pulley at the position of the first horizontal iron of the iron tower and fix it with high-strength bolts. ②. Use the hoisting pulley for auxiliary hoisting, and smoothly install the hydraulic jacking sleeve frame onto the base, and check that the opening direction of the sleeve frame is consistent with the traction direction. ③. Install the hydraulic operation console at a position that is convenient for operation and far from the hoisting area. ④. Assemble the main body of the slewing frame, hoist the main body of the slewing frame onto the base, adjust the distance between the rollers of the slewing frame and the standard section, and finally connect and fix the slewing frame to the base; ⑤. After the installation of the main body of the slewing frame is completed, install the jacking oil cylinder, lifting frame assembly, and guardrail assembly in sequence. After completion, install the jacking mechanism assembly, jacking cap, upper and lower walkways, and suspension rod assembly; ⑥. After installing the components in step ⑤, fix the guy wire; set the guy wire of the slewing frame with a steel wire rope, and adjust the tension with a hand winch; S4. Installation of the mast and reinforced standard sections: ①. Place the tapered section of the mast top steadily on the introduction trolley of the rod section moving slide rail, and slowly push it into the center position inside the slewing frame by using the traction device, and recheck the alignment accuracy; ②. Start the hydraulic system and lift the jacking rod at a uniform speed. When it is lifted to a height where a standard section is vacated below, pause the jacking and lock the hydraulic system; ③. Place the reinforced standard section on the introduction trolley of the introduction platform, smoothly push it into the slewing frame from the lower part along the slide rail, and align it with the tapered section of the mast top; slowly lower the jacking rod to accurately connect the standard section with the tapered section of the mast top, and pre-tighten the bolts in the diagonal cross sequence to ensure uniform gaps; after completely lowering the jacking rod, use a torque wrench to re-tighten the bolts; ④. Repeat the above jacking steps to introduce and install the remaining 7 reinforced standard sections in sequence; for every 2 standard sections installed, use 4 groups of 35 pin shafts to penetrate the preset pin holes and install split pins for fixation to ensure reliable pin shaft connection; S5. Jacking and slewing mechanism: ①. Place the slewing bearing flat on a stable platform and align and install it with the upper support and the lower support respectively; ②. Hoist the assembled slewing mechanism steadily onto the introduction trolley, and after fixing it firmly, push it into the center position inside the slewing frame along the slide rail; ③. Operate the hydraulic cylinder to retract and slowly lower the standard section of the mast top. When the distance between the lower end face of the standard section and the upper end face hole of the slewing mechanism is 2 cm, pause, initially align the hole positions by means of auxiliary positioning pins or pre-piercing bolts, and insert some bolts to fix the relative positions; ④. Continue to retract the cylinder to make the standard section fully fit with the end face of the slewing mechanism. After tightening the bolts in place, the jacking work of the slewing mechanism can be carried out; S6. Jacking of the transition section and standard section: ①. After completing the jacking of the slewing mechanism, hoist the transition section and the reinforced standard section in sequence; operate the hydraulic system to slowly jack up, and the jacking height each time should be appropriate to introduce the standard section; continue to jack up until the lower support of the slewing mechanism exceeds the top of the slewing frame, ensuring that the vertical distance from the guyed mast slewing mechanism to the guy wire of the slewing frame ≤ 18 m; ②. When the lower support passes over the top of the slewing frame, immediately install the upper guy wire of the guyed mast; when jacking up the guyed mast, the upper guy wire should be in a slack state, and after the jacking is completed, tighten them respectively; the included angle of the upper guy wire of the guyed mast with the ground shall not be greater than 65°; ③. After the upper guy wire of the guyed mast is tightened and the structure is stable, install the leading beam guide pulley at the designated position of the transition section, fix it with high-strength bolts, and check the rotation flexibility and installation firmness of the pulley; S7. Hoisting of the boom: ①. Assemble the boom head section, boom standard section, and boom root section on the ground, and fasten and connect them with bolt groups to ensure that the boom is symmetrically arranged on both sides of the hydraulic jacking slewing frame along the line or transverse line direction, and the boom head section faces the slewing frame; ②. Lead the two traction ropes through the steering pulley at the bottom of the frame, the guide pulley of the transition section, the holding rod and the center of the slewing mechanism, the pulley at the top of the mast, and finally to the boom hanging point pulley, then turn back and fix them, and connect the rope head at the bottom of the frame to the capstan; ③. Start the capstan and synchronously lift the boom symmetrically to the height of the upper support of the boom, and fix the boom root and the upper support connection seat through the φ45 pin shaft; the old tower can also be used for auxiliary lifting, and the lifting point wire rope is fixed at the connection between the first and second sections of the boom standard section, and the control rope is set at the connection between the second and third sections; the boom lifting is kept synchronous throughout the whole process. After the lifting is completed, the boom and the mast are temporarily fixed with ropes to ensure the stability of the structure; S8. Lifting and heightening of the pole: ①. Confirm that the boom cantilever height is less than 18m, pre-loosen the four grinding wire ropes, level the boom and lower the hook to the ground; remove the 35 pin between the lowest standard section in the frame and the foundation base; if the boom cannot be leveled after hoisting, use a chuck to anchor the two heaving ropes to the first standard section of the frame, temporarily fix the rocker arm, and then loosen the grinding wire rope; ②. Pull wire adjustment: Appropriately loosen the four sets of upper pull wires on the pole, and gradually loosen them during the subsequent lifting process to ensure the stability of the pole; ③. Climbing claws in place: Pull up the climbing claws of the jacking platform to make them support the standard section steps and keep them level, providing a support point for jacking; ④. Synchronous jacking: Start the hydraulic cylinder system, and the dual cylinders work synchronously to ensure that the jacking platform is level, control the gap between the guide roller and the tower body to be 3mm and the gap between each roller is consistent to avoid jacking deviation; ⑤. Standard section hoisting: While lifting, place the new standard section on the introduction trolley of the rod section moving slide rail through motorized capstan hoisting or manual handling, and prepare for installation; ⑥. Installation of standard section: When the top of the standard section in the sleeve frame rises 20mm above the new standard section, stop and push the new standard section into the sleeve frame; retract the cylinder to make the end faces of the two standard sections fit together, use 4 sets of 35 pins to complete the connection and tighten the bolts; ⑦. Repeat the above steps to install the remaining standard sections in sequence. After each section is completed, pull out the introduction trolley, lower the standard section to the base, and loosen the climbing claw. After reaching the predetermined height, install the waist ring and tie the pull wire. After all standard sections are installed, retract the cylinder, tighten the bolts of the foundation base and the tower body standard section, and complete a jacking operation. S9. Installation of safety rope and luffing rope ①. Installation of safety rope: Connect the two ends of the safety rope to the boom head and the top of the mast through the shackles, and slowly level the boom; ②. Installation of luffing rope: After the boom is installed, remove the upper pulley of the boom and use the original boom traction rope as the luffing wire rope; Release the luffing wire rope from the mast top pulley block, and wind it back and forth between the mast top pulley block and the boom head pulley block at a rate of 6 times; fix the rope head to the mast top working hole with a wedge-shaped rope clamp, and fasten the rope tail with no less than 3 rope clamps. The rope clamp spacing is ≥ 6 times the wire rope diameter, and the U-shaped ring is pressed on the short rope side; ③ Installation of the lifting ropes: Wind the two lifting steel ropes at a 4-fold rate. The rope ends pass through the turning pulley at the bottom of the sleeve frame, the guiding pulley of the transition section lead beam, the center of the gin pole, the guiding pulley above the slewing mechanism, and the guiding pulley at the connection between the boom root and the slewing mechanism in sequence; lead them along the lower plane of the boom to the boom tip pulley block, pass through the single pulley above the hook, the boom tip pulley block, and the double pulley below the hook, and finally fix them to the working hole at the boom tip with a special fixture. The rope tails are also fixed with no less than 3 rope clamps; lead the lifting rope at the turning pulley at the bottom of the sleeve frame to the winch; S10 Installation of the waist ring ① Assemble the rollers to the half-frame of the waist ring and connect the two half-frames with high-strength bolts, washers and nuts; ② Adjust the vertical position of the waist ring, install the guy wires and anti-settlement guy wires, make the rollers in all directions closely adhere to the main chord of the derrick, and after confirming that the position is correct, tighten the bolts and tighten the guy wires; S11 Removal of the cross arm ① Bind the hoisting rope to the center of gravity position in the middle section of the cross arm. After hoisting, first remove the high-position side, then the low-position side, and finally remove the remaining ground wire cross arm, and use the gin pole for overall removal; ② Control the distance between the tower component and the iron tower through the slack rope and pulley block. Pause the lowering when the lifted component is 1 meter above the platform, and slowly lower it to the predetermined position after the ground personnel control the landing position; S11 Removal of the tower body ① Before the lifted component detaches from the tower body, monitor the force balance on both sides of the swinging arm gin pole in real time. Tighten the root control rope during lowering, and pause the traction after the binding point of the lifted component detaches from the tower body; ② During the lowering, the on-site commander controls the rope personnel to fine-tune through the winch to keep the distance between the lifted component and the tower body > 100 mm; pause when the lifted component is 1 meter from the platform, and slowly land it to the predetermined position under the guidance of the ground personnel; ③ Gradually lower the height of the swinging arm gin pole as the tower body is removed. After the entire iron tower is removed, then remove the gin pole mast and the tower body structure in sequence; S12 Removal of the boom ① Place the hook on the ground for fixation, remove the fixed end of the hoisting rope at the boom tip, and separate the hook from the gin pole; ② Release the steel wire rope through the rotating pulley at the top of the tower and fix it to the boom. Take in the rope to make the anti-collision block at the top of the tower contact the boom section. Repeat the operation to fix the double boom and the top of the tower as a whole. Finally, tighten the lifting rope and fix the hook to the boom tip; S13 Removal of the standard section: ① Remove the connection bolts between the bottommost standard section in the sleeve frame and the foundation base, extend the hydraulic cylinder without load to the position of the second standard section, and pull up the climbing claws to hold against the steps; ② Lift the gin pole to about 20 mm above the ground, push the introduction trolley to below the bottommost standard section, and remove the connection between the bottommost and the second standard sections; ③ Retract the oil cylinder to make the second standard section contact the foundation base, and complete the removal of one standard section; S14 Gin pole height adjustment and guy wire control ① Adjustment of the guy wires: When the gin pole is lifted or lowered, simultaneously pay out or tighten the upper guy wires to ensure that the gin pole is always in a protected state; ② Treatment of the waist ring: During the removal of the standard section, gradually remove the waist ring guy wires, but the waist ring structure is not removed temporarily to maintain the temporary support for the gin pole; S15 Removal of the mast and the strengthening section ① Lift the mast with the same traction system as during installation, remove the connection bolts between the transition section and the upper standard section, and start the winch to lower the mast to the ground; ②. Gradually remove the transition section and the above enhanced standard sections through the hydraulic jacking sleeve frame. The operation steps are the same as those for removing the standard sections.

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