Internal suspension stay wire holding pole construction platform based on power transmission tower and construction method

Abstract

The invention discloses an internal suspension stay wire derrick construction platform and a construction method based on a power transmission tower, the derrick construction platform comprises four tower foundation piles, a steel frame foundation is arranged above the tower foundation piles, buoyancy tanks are arranged around the tower foundation piles, and the buoyancy tanks are connected through circular grooves and bolts to form a stable working face. The steel pipe anchor piles are fixed to the water bottom; the holding pole is installed on the top of the steel frame foundation and connected with the buoyancy tank platform through the inner stay wire, and a suspension-tension system is formed. Through combination of the modularized buoyancy tank platform and the inner suspension stay wire holding pole, the construction efficiency and safety of the overwater power transmission tower are improved, meanwhile, the buoyancy tank platform is anchored through the steel wire rope and the steel pipe anchor pile, the stability of the construction platform is ensured, and the safety risk is reduced.

Description

Technical Field

[0001] This invention relates to a method for constructing internally suspended guyed poles, and particularly to a construction platform and method for internally suspended guyed poles based on power transmission towers, belonging to the field of power transmission tower construction technology. Background Technology

[0002] With the continuous advancement of power grid upgrade and renovation projects, an increasing number of old transmission towers need to be dismantled. However, the dismantling of transmission towers on water faces numerous challenges, becoming a difficult issue in the industry. Traditional dismantling methods have the following problems in practical application: ① Limited space: Unlike land-based dismantling, water-based dismantling cannot easily utilize large machinery, and the construction platform is difficult to build. Traditional dismantling methods usually require a large operating space, which is difficult to achieve in a water environment, resulting in low construction efficiency and increased construction difficulty and cost. ② Difficulty in equipment anchoring: Water-based dismantling requires ensuring the stability of the construction platform and equipment. Traditional anchoring methods cannot provide sufficient stability, easily leading to displacement or tilting of the construction platform and equipment during dismantling, increasing construction safety risks. ③ Inconvenient transportation channels: During water-based dismantling, the dismantled tower materials need to be transported to designated locations for processing in a timely manner. However, transportation channels in waterways are often inconvenient, especially during dismantling, where the transportation of large tower materials needs to overcome the influence of natural factors such as water flow and wind direction. Traditional transportation methods are inefficient and prone to transportation accidents in complex waters, further increasing construction costs and safety risks. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a construction platform and construction method for an internally suspended guyed pole based on a power transmission tower. By setting up an internally suspended guyed pole construction platform, the rapid installation and dismantling of the pole is realized, reducing construction preparation time and equipment adjustment time.

[0004] The technical solution adopted by this invention to solve the technical problem is as follows: An internally suspended guyed pole construction platform based on a power transmission tower includes four tower foundation piles, a steel frame foundation is set above the tower foundation piles, floating boxes are set around the tower foundation piles, a first fence is set at the outer edge of the floating boxes, steel wire ropes are set between the tower foundation piles and the floating boxes, and a second fence is set around the tower foundation piles.

[0005] A support pole is installed on top of the steel frame foundation.

[0006] The number of pontoons is at least 50. Adjacent pontoons are fixedly connected together by circular grooves and pins. Through holes are dug in the pontoons located at the four corners, and steel pipe anchor piles are inserted into the through holes. The bottom of the steel pipe anchor piles is inserted into the bottom of the water.

[0007] A steel wire rope is installed between the tower foundation piles and the pontoon.

[0008] The first enclosure consists of a first pole and a first rope. The first pole is installed on the outer pontoon, and the first rope is installed between adjacent first poles.

[0009] The pontoons surrounding the tower foundation piles are equipped with second poles, and second ropes are installed between adjacent second poles.

[0010] The construction method for an internally suspended guyed pole construction platform based on a power transmission tower includes the following steps: S1. Site Setup ① Prepare the pontoons required for construction and set circular grooves around each pontoon. Specifically, three circular grooves are set at intervals on the left and right sides of the pontoon, and two circular grooves are set at intervals on the front and rear sides of the pontoon. The circular grooves on the left and right sides are distributed in an alternating pattern with the circular grooves on the front and rear sides. ② The pontoons are assembled at the dock, and adjacent pontoons are fixed together with pins; ③ Drill holes in the outer pontoon, and make sure the size of the through holes matches the size of the steel pipe anchor piles; ④ Prepare four steel pipe anchor piles, each 9m long and 20cm in inner diameter, which will be inserted through the floating boxes around the construction platform and into the lake bottom. ⑤ Insert a second rod into the circular groove around the foundation pile of the iron tower, and wrap at least one layer of second rope between adjacent second rods; ⑥ Insert the first rod into the circular groove of the outermost pontoon of the construction platform, and wrap at least one layer of first rope between adjacent first rods; ⑦ Install steel wire ropes between the foundation piles of the iron tower and the pins on the outer wall of the surrounding floating boxes to ensure the stability of the construction platform, and install pads at the contact points between the steel wire ropes and the floating boxes. S2. Installation of the pole ① After the pole arrives at the site, inspect each section of the pole; ② Assemble the three-section pole and pole cap in advance, and connect them with bolts; ③ The upward pulley and the guy wire of the gantry are brought down from the top of the tower through the lifting pulley and connected to the gantry cap. The pre-assembled gantry and gantry cap are slowly hoisted. When the gantry is raised to the height of one section, the hoisting is stopped and the next section of the gantry is assembled at the bottom of the gantry (5). After the assembly is completed, the hoisting can continue. This process is repeated. ④ After the gantry is assembled, use a winch and traction rope to lift the gantry to the top of the tower; at the same time, use the winch and traction rope on the other side to tie the traction rope to the connection point of the standard section of the gantry at the middle and lower end, and continue to lift the gantry until it protrudes from the tower. ⑤ After the gantry is lifted to the top of the tower, tie the support rope at the joint of the tower and place soft padding at the contact point between the support rope and the tower; the inner guy wire is connected to the tower leg through the steering pulley to facilitate adjustment of the gantry tilt angle. S3. Removal of the crossarm: ① Using the ground wire crossarm as the lifting point, use a winch to remove the lower, middle, and upper crossarms in sequence from bottom to top, and finally remove the entire ground wire crossarm; ② Tie the lifting rope to the center of the middle section of the crossarm. After the wire rope is lifted under tension, first remove the high-side bolts, then remove the low-side bolts, and finally remove the ground wire crossarm. ③ When the crossarm is lowered, use the guide rope to control the distance between the tower component and the tower to avoid collision; pause the descent when the component is 2 meters away from the platform, and then slowly lower it; during the descent, personnel must not stand under the component. ④ When the hoisting component is 20 cm from the ship's deck, personnel will assist in lowering it to the designated position; ⑤ The crossbeams are disassembled on the platform by ground staff and then moved to the reserved transport pontoon platform; S4. Demolition of the tower body ① When the hoisting component is lowered, the control rope at the base must be tightened to prevent the hoisting component from slipping and tipping over during the descent. ② Stop pulling when the hoisting parts are detached from the tower, and ensure that all lifting tools are in good condition; ③ During the descent of the tower component, the distance between the component and the tower body should be observed at all times; the person in charge of the control rope should slowly tighten the control rope with a winch to adjust the distance between the hoisted component and the tower body. The distance should be greater than 100mm and should not deviate too far from the tower body. ④ When lifting components that are close to the tower position, pay attention to the angle and position of the control rope and the traction rope. Ensure that the load, the pole head, and the lifting traction rope are in the same plane and maintain a certain angle with the lifting rope to avoid tension. ⑤ When the hoisted component is 2 meters above the water surface, stop the descent; the transport ship will then move to the lower position and slowly lower it. During the descent, the personnel on board must wait in the cargo hold of the hoisted component and must not stand under it; when the hoisted component is 20 centimeters away from the ship's deck, personnel will assist in lowering it to the designated position. S5, the drop of the pole ① Set the first waist ring on the top surface of the tower material to be dismantled, and set the second waist ring at the top of the next dismantling section; loosen the waist ring when dismantling begins, and after the pole is lowered to the predetermined position, install the waist ring and tighten the waist ring cable to fix it on the 4 main materials; ② After setting up the waist ring, guide pulley, and lifting pulley, and positioning the traction wire rope, start the winch; slowly lower the pole while simultaneously tightening the pull line to keep the pole vertical; after the pole has descended to the predetermined position, stop the winch and tighten the support rope and upper pull line; after the pole is in place, stop the winch, fix the upper pull line, and slightly raise the pole to make the upper pull line slightly taut. ③ After wrapping one end of the support rope with a soft material, tie it to the node of the main material of the tower body, tighten the hand hoist to make the support rope taut, and then loosen the lifting rope to make the support rope bear the force. ④ Check the tension of the upper guy line and the tilt of the pole. The angle between the supporting rope and the pole should not exceed 45°, and the angle between the two opposite supporting ropes should not exceed 90°. ⑤ The steps for lowering the pole are basically the same each time. Repeat the above process until all lowering operations are completed. S6, Removal of Tower Legs ① Remove the second-to-last section of the gantry. Install a fixed pulley at the upper 1 / 3 of the gantry. Secure the grinding rope to the main tower structure on one side of the pulley, and connect the other side to the winch via the pulley at the top of the tower. Start the winch to lower the gantry to the ground. ② The high-altitude personnel climb to the upper part of the third section of the pole, remove the connecting bolts, and dismantle the lower part of the pole. Lower the pole to a height of 2 meters on the ground and connect the pole base. ③ With 20 meters of pole remaining, raise the pole again; ④ Dismantle the tower by cutting and separating it into sections, removing the anti-theft caps, and breaking down the tower; remove the side diagonal and horizontal members from top to bottom; ⑤ Remove the remaining four main members, set up a steering trolley at the edge of the pontoon along the diagonal direction, and use the removed tower members to set up an A-frame support in the middle of the main members. The main members slowly fall along the diagonal direction. After the A-frame support is under force, remove the main members.

[0011] The positive and beneficial effects of this invention are: 1. The floating platform of the present invention forms a rigid platform through modular assembly, and uses the buoyancy of water to balance the construction load, which has high load-bearing capacity and stability. By setting steel anchor piles and supporting ropes, the stability of the platform during construction is guaranteed, which can effectively solve the problems of insufficient stability and limited load-bearing capacity in traditional methods, and ensure the safety and efficiency of construction.

[0012] 2. The internally suspended gantry of this invention is anchored to the main material nodes of the tower via a supporting rope and connected to the anchor points of the floating platform via an internal guy wire, forming a "suspension-tensioning" system. During the hoisting process, the load is transferred to the floating platform through the gantry and then distributed to the underwater strata via anchor piles, achieving a mechanical balance of "aerial hoisting-water bearing". This design not only improves the efficiency of hoisting but also ensures the stability and safety during construction, making it particularly suitable for the dismantling of power transmission towers on water.

[0013] 3. This invention uses a segmented dismantling method to dismantle the iron tower, and uses a motorized winch and control rope to precisely control the lifting of the components, ensuring that the distance between the lifting components and the tower body is not less than 100 mm to avoid collisions; when the tower material falls to 2 meters above the water surface, it is received by a transport platform to achieve seamless "air-water" transfer; this improves dismantling efficiency and reduces construction risks.

[0014] 4. This invention reduces the risks of working at heights and on water by setting up a first and a second fence on the floating platform; and improves the stability of the platform by setting steel wire ropes between the tower foundation piles and the floating box. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the pontoon of the present invention; Figure 3 This is a schematic diagram of the reinforcement structure of the iron tower foundation piles and floating boxes of the present invention; Figure 4 This is a schematic diagram of the structure of the pontoon and steel pipe anchor pile of the present invention; Among them: 1-floating box, 2-steel pipe anchor pile, 3-iron tower foundation pile, 4-steel frame foundation, 5-pole, 6-first insert pole, 7-first enclosure rope, 8-second insert pole, 9-second enclosure rope, 10-steel wire rope. Detailed Implementation

[0016] The invention will be further explained and described below with reference to the accompanying drawings: Example 1, see Figures 1-4 A construction platform for internally suspended guyed poles based on power transmission towers includes four tower foundation piles 3, a steel frame foundation 4 above the tower foundation piles 3, floating boxes 1 around the tower foundation piles 3, a first fence at the outer edge of the floating boxes 1, a steel wire rope 10 between the tower foundation piles 3 and the floating boxes 1, and a second fence around the tower foundation piles 3.

[0017] A support pole 5 is installed on top of the steel frame foundation 4.

[0018] There are at least 50 pontoons 1. Adjacent pontoons 1 are fixedly connected together by circular grooves and pins. Through holes are dug on the pontoons 1 located at the four corners, and steel pipe anchor piles 2 are inserted into the through holes. The bottom of the steel pipe anchor piles 2 is inserted into the seabed.

[0019] A steel wire rope 10 is installed between the iron tower foundation pile 3 and the pontoon 1.

[0020] The first enclosure consists of a first pole 6 and a first rope 7. The first pole 6 is installed on the outer float 1, and the first rope 7 is installed between adjacent first poles 6.

[0021] A second pole 8 is installed on the pontoon 1 around the iron tower foundation pile 3, and a second rope 9 is installed between adjacent second poles 8.

[0022] In the above description, the construction platform consists of multiple floating boxes connected together, and four steel pipe anchor piles are located around the perimeter of the construction platform.

[0023] In the above description, the first insert matches the corresponding circular groove, and the second insert matches the corresponding circular groove.

[0024] In the above description, there are at least two steel wire ropes on each tower foundation pile, which are sleeved on the tower foundation pile and connected to the circular groove on the outer wall of the pontoon.

[0025] Example 2, the construction method of the above-mentioned internal suspension guyed pole construction platform based on the transmission tower includes the following steps: S1. Site Setup ① Prepare the pontoon 1 required for construction, and set circular grooves around each pontoon 1. Specifically, three circular grooves are set at intervals on the left and right sides of the pontoon 1, and two circular grooves are set at intervals on the front and rear sides of the pontoon 1. The circular grooves on the left and right sides are distributed in an alternating pattern with the circular grooves on the front and rear sides. ② The pontoons are assembled at the dock, and adjacent pontoons are fixed together with pins; ③ Drill holes in the outer pontoon, and make sure the size of the through holes matches the size of the steel pipe anchor piles; ④ Prepare four steel pipe anchor piles, each 9m long and 20cm in inner diameter, which will be inserted through the floating boxes around the construction platform and into the lake bottom. ⑤ Insert a second rod 8 into the circular groove around the iron tower foundation pile 3, and wrap at least one layer of second rope 9 between adjacent second rods 8; ⑥ Insert the first rod 6 into the circular groove of the outermost pontoon 1 of the construction platform, and wrap at least one layer of first rope 7 between adjacent first rods 6; ⑦ Install steel wire ropes 10 between the iron tower foundation piles 3 and the pins on the outer wall of the surrounding floating boxes 1 to ensure the stability of the construction platform, and install pads at the contact points between the steel wire ropes 10 and the floating boxes 1. S2. Installation of the pole ① After the pole arrives at the site, inspect each section of the pole; ② Assemble the three-section pole 5 and pole cap in advance, and connect them with bolts; ③ The upward pulley and the guy wire of the gantry are brought down from the top of the tower through the lifting pulley and connected to the gantry cap. The pre-assembled gantry and gantry cap are slowly hoisted. When the height of gantry 5 is raised by one section, the hoisting is stopped, and the next section of gantry is assembled at the bottom of gantry 5. Only after the assembly is completed can the hoisting continue. This process is repeated. ④ After the gantry is assembled, use a winch and traction rope to lift the gantry to the top of the tower; at the same time, use the winch and traction rope on the other side to tie the traction rope to the connection point of the standard section of the gantry at the middle and lower end, and continue to lift the gantry until it protrudes from the tower. ⑤ After the gantry is lifted to the top of the tower, tie the support rope at the joint of the tower and place soft padding at the contact point between the support rope and the tower; the inner guy wire is connected to the tower leg through the steering pulley to facilitate adjustment of the gantry tilt angle. S3. Removal of the crossarm: ① Using the ground wire crossarm as the lifting point, use a winch to remove the lower, middle, and upper crossarms in sequence from bottom to top, and finally remove the entire ground wire crossarm; ② Tie the lifting rope to the center of the middle section of the crossarm. After the wire rope is lifted under tension, first remove the high-side bolts, then remove the low-side bolts, and finally remove the ground wire crossarm. ③ When the crossarm is lowered, use the guide rope to control the distance between the tower component and the tower to avoid collision; pause the descent when the component is 2 meters away from the platform, and then slowly lower it; during the descent, personnel must not stand under the component. ④ When the hoisting component is 20 cm from the ship's deck, personnel will assist in lowering it to the designated position; ⑤ The crossbeams are disassembled on the platform by ground staff and then moved to the reserved transport pontoon platform; S4. Demolition of the tower body ① When the hoisting component is lowered, the control rope at the base must be tightened to prevent the hoisting component from slipping and tipping over during the descent. ② Stop pulling when the hoisting parts are detached from the tower, and ensure that all lifting tools are in good condition; ③ During the descent of the tower component, the distance between the component and the tower body should be observed at all times; the person in charge of the control rope should slowly tighten the control rope with a winch to adjust the distance between the hoisted component and the tower body. The distance should be greater than 100mm and should not deviate too far from the tower body. ④ When lifting components that are close to the tower position, pay attention to the angle and position of the control rope and the traction rope. Ensure that the load, the pole head, and the lifting traction rope are in the same plane and maintain a certain angle with the lifting rope to avoid tension. ⑤ When the hoisted component is 2 meters above the water surface, stop the descent; the transport ship will then move to the lower position and slowly lower it. During the descent, the personnel on board must wait in the cargo hold of the hoisted component and must not stand under it; when the hoisted component is 20 centimeters away from the ship's deck, personnel will assist in lowering it to the designated position. S5, the drop of the pole ① Set the first waist ring on the top surface of the tower material to be dismantled, and set the second waist ring at the top of the next dismantling section; loosen the waist ring when dismantling begins, and after the pole is lowered to the predetermined position, install the waist ring and tighten the waist ring cable to fix it on the 4 main materials; As described above, the guy line should be tightened slowly and synchronously as the pole is lowered to keep the pole vertical at all times.

[0026] ② After setting up the waist ring, guide pulley, and lifting pulley, and positioning the traction wire rope, start the winch; slowly lower the pole while simultaneously tightening the pull line to keep the pole vertical; after the pole has descended to the predetermined position, stop the winch and tighten the support rope and upper pull line; after the pole is in place, stop the winch, fix the upper pull line, and slightly raise the pole to make the upper pull line slightly taut. ③ After wrapping one end of the support rope with a soft material, tie it to the node of the main material of the tower body, tighten the hand hoist to make the support rope taut, and then loosen the lifting rope to make the support rope bear the force. ④ Check the tension of the upper guy line and the tilt of the pole. The angle between the supporting rope and the pole should not exceed 45°, and the angle between the two opposite supporting ropes should not exceed 90°. ⑤ The steps for lowering the pole are basically the same each time. Repeat the above process until all lowering operations are completed. In the above description, the dimensions of the gantry are 550mm×550mm×24m. If the gantry is tilted too much when hoisting the tower sections, it may rest on the tower material, making it difficult to remove the sections. When hoisting the tower body, the tilt of the gantry should not exceed 15°. When hoisting the uppermost tower section, the tilt should be controlled within 5° (i.e., basically in an upright state, with the upper guy wire taut).

[0027] In the above description, when checking the tension of the top guy line and the tilt of the gantry, the angle between the supporting rope and the gantry should not exceed 45°, and the angle between the two diagonally opposite supporting ropes should not exceed 90°. At this time, the top guy line can be kept at a certain degree of slack, which allows for a slight tilt towards the side of the gantry during hoisting, making it easier to position.

[0028] In the above description, the height of the gantry crane above the cylinder opening of the tower body during the hoisting operation should meet the requirement of smooth positioning of the section to be hoisted, and should not exceed 1 / 3 of the total length of the gantry crane.

[0029] S6, Removal of Tower Legs ① Remove the second-to-last section of the gantry. Install a fixed pulley at the upper 1 / 3 of the gantry. Secure the grinding rope to the main tower structure on one side of the pulley, and connect the other side to the winch via the pulley at the top of the tower. Start the winch to lower the gantry to the ground. ② The high-altitude personnel climb to the upper part of the third section of the pole, remove the connecting bolts, and dismantle the lower part of the pole. Lower the pole to a height of 2 meters on the ground and connect the pole base. ③ With 20 meters of pole remaining, raise the pole again; ④ Dismantle the tower by cutting and separating it into sections, removing the anti-theft caps, and breaking down the tower; remove the side diagonal and horizontal members from top to bottom; ⑤ Remove the remaining four main members, set up a steering trolley at the edge of the pontoon along the diagonal direction, and use the removed tower members to set up an A-frame support in the middle of the main members. The main members slowly fall along the diagonal direction. After the A-frame support is under force, remove the main members.

[0030] The floating platform of this invention serves as a flexible infrastructure, providing a stable working platform in complex hydrological environments. Through rational design and configuration, the floating platform can adapt to different water conditions. The platform uses 3.2m×2.8m×0.92m assembled floating boxes, connected by U-shaped circular groove pins. 72-81 floating boxes can be flexibly configured according to the water depth (1.5-4m) of the tower location to form a stable working surface. It is equipped with 9m long, 20cm diameter steel pipe anchor piles, which have a water flow impact resistance of up to 0.8m / s, solving the problem of "no support" on the water site and providing a solid foundation platform for construction. The floating platform and the internal suspended mast form a "vertical linkage" system: the platform is equipped with equipment such as winches and steering pulleys, and the force is transferred through anchor piles to prevent the equipment from overturning; the mast adopts a 550×550-28m steel pipe structure, with two waist rings to control the verticality, the tilt angle is ≤15°, and the single lifting weight is up to 3.5t, which realizes the orderly dismantling of crossarms and tower body in sections. The dismantling cycle of each iron tower is shortened to 7-10 days, reducing construction risks and the impact on the surrounding environment. It also greatly reduces construction costs such as labor and machinery, significantly improves construction efficiency, and effectively shortens the construction period.

Claims

1. A construction platform for internally suspended guyed poles based on transmission towers, comprising tower foundation piles (3), characterized in that: There are four iron tower foundation piles (3), and a steel frame foundation (4) is set above the iron tower foundation piles (3). Floating boxes (1) are set around the iron tower foundation piles (3), and a first fence is set at the outer edge of the floating boxes (1). A steel wire rope (10) is set between the iron tower foundation piles (3) and the floating boxes (1). A second fence is set around the iron tower foundation piles (3).

2. The internally suspended guyed pole construction platform based on a power transmission tower according to claim 1, characterized in that: The top of the steel frame foundation (4) is provided with a support pole (5).

3. The internally suspended guyed pole construction platform based on a power transmission tower according to claim 1, characterized in that: There are at least 50 pontoons (1), and adjacent pontoons (1) are fixedly connected together by circular grooves and pins. Through holes are dug on the pontoons (1) located at the four corners, and steel pipe anchor piles (2) are inserted into the through holes. The bottom of the steel pipe anchor piles (2) is inserted into the bottom of the water.

4. The internally suspended guyed pole construction platform based on a power transmission tower according to claim 1, characterized in that: A steel wire rope (10) is installed between the iron tower foundation pile (3) and the pontoon (1).

5. The internally suspended guyed pole construction platform based on a power transmission tower according to claim 1, characterized in that: The first fence consists of a first pole (6) and a first rope (7). The first pole (6) is provided on the outer float (1), and the first rope (7) is provided between adjacent first poles (6).

6. The internally suspended guyed pole construction platform based on a power transmission tower according to claim 1, characterized in that: The iron tower foundation pile (3) is provided with a second insertion rod (8) on the pontoon (1) around it, and a second rope (9) is provided between adjacent second insertion rods (8).

7. A construction method for an internally suspended guyed pole construction platform based on a transmission tower as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Site Setup ① Prepare the pontoons (1) required for construction and set circular grooves around each pontoon (1). There are three circular grooves on the left and right sides of the pontoon (1) at intervals, and two circular grooves on the front and rear sides of the pontoon (1) at intervals. The circular grooves on the left and right sides are distributed in an alternating pattern with the circular grooves on the front and rear sides. ② The pontoons (1) are assembled at the dock, and adjacent pontoons (1) are fixed by pins; ③ Drill holes in the outer floating box (1), and the size of the through holes matches the size of the steel pipe anchor pile (2); ④ Prepare four steel pipe anchor piles (2) with a length of 9m and an inner diameter of 20cm, which are respectively inserted through the floating boxes (1) around the construction platform and inserted into the lake bottom; ⑤ Insert a second rod (8) into the circular groove around the iron tower foundation pile (3), and wrap at least one layer of second rope (9) between adjacent second rods (8). ⑥ Insert the first rod (6) into the circular groove of the outermost pontoon (1) of the construction platform, and wrap at least one layer of first rope (7) between adjacent first rods (6). ⑦ Set steel wire ropes (10) between the iron tower foundation piles (3) and the pins on the outer walls of the surrounding floating boxes (1) to ensure the stability of the construction platform, and set pads at the contact points between the steel wire ropes (10) and the floating boxes (1). S2. Installation of the pole ① After the pole arrives at the site, inspect each section of the pole; ② Assemble the three-section pole (5) and pole cap in advance, and connect them with bolts; ③ The upward pulley and the guy wire of the gantry are brought down from the top of the tower through the lifting pulley and connected to the gantry cap. The pre-assembled gantry and gantry cap are slowly hoisted. When the gantry (5) is raised to the height of one section, the hoisting is stopped and the next section of the gantry (5) is assembled at the bottom. After the assembly is completed, the hoisting can continue. This process is repeated. ④ After the gantry is assembled, use a winch and traction rope to lift the gantry to the top of the tower; at the same time, use the winch and traction rope on the other side to tie the traction rope to the connection point of the standard section of the gantry at the middle and lower end, and continue to lift the gantry until it protrudes from the tower. ⑤ After the gantry is lifted to the top of the tower, tie the support rope at the joint of the tower and place soft padding at the contact point between the support rope and the tower; the inner guy wire is connected to the tower leg through the steering pulley to facilitate adjustment of the gantry tilt angle. S3. Removal of the crossarm: ① Using the ground wire crossarm as the lifting point, use a winch to remove the lower, middle, and upper crossarms in sequence from bottom to top, and finally remove the entire ground wire crossarm; ② Tie the lifting rope to the center of the middle section of the crossarm. After the wire rope is lifted under tension, first remove the high-side bolts, then remove the low-side bolts, and finally remove the ground wire crossarm. ③ When the crossarm is lowered, use the guide rope to control the distance between the tower component and the tower to avoid collision; pause the descent when the component is 2 meters away from the platform, and then slowly lower it; during the descent, personnel must not stand under the component. ④ When the hoisting component is 20 cm from the ship's deck, personnel will assist in lowering it to the designated position; ⑤ The crossbeams are disassembled on the platform by ground staff and then moved to the reserved transport pontoon platform; S4. Demolition of the tower body ① When the hoisting component is lowered, the control rope at the base must be tightened to prevent the hoisting component from slipping and tipping over during the descent. ② Stop pulling when the hoisting parts are detached from the tower, and ensure that all lifting tools are in good condition; ③ During the descent of the tower component, the distance between the component and the tower body should be observed at all times; the person in charge of the control rope should slowly tighten the control rope with a winch to adjust the distance between the hoisted component and the tower body. The distance should be greater than 100mm and should not deviate too far from the tower body. ④ When lifting components that are close to the tower position, pay attention to the angle and position of the control rope and the traction rope. Ensure that the load, the pole head, and the lifting traction rope are in the same plane and maintain a certain angle with the lifting rope to avoid tension. ⑤ When the hoisted component is 2 meters above the water surface, stop the descent; the transport ship will then move to the lower position and slowly lower it. During the descent, the personnel on board must wait in the cargo hold of the hoisted component and must not stand under it; when the hoisted component is 20 centimeters away from the ship's deck, personnel will assist in lowering it to the designated position. S5, the drop of the pole ① Set the first waist ring on the top surface of the tower material to be dismantled, and set the second waist ring at the top of the next dismantling section; loosen the waist ring when dismantling begins, and after the pole is lowered to the predetermined position, install the waist ring and tighten the waist ring cable to fix it on the 4 main materials; ② After setting up the waist ring, guide pulley, and lifting pulley, and positioning the traction wire rope, start the winch; slowly lower the pole while simultaneously tightening the pull line to keep the pole vertical; after the pole has descended to the predetermined position, stop the winch and tighten the support rope and upper pull line; after the pole is in place, stop the winch, fix the upper pull line, and slightly raise the pole to make the upper pull line slightly taut. ③ After wrapping one end of the support rope with a soft material, tie it to the node of the main material of the tower body, tighten the hand hoist to make the support rope taut, and then loosen the lifting rope to make the support rope bear the force. ④ Check the tension of the upper guy line and the tilt of the pole. The angle between the supporting rope and the pole should not exceed 45°, and the angle between the two opposite supporting ropes should not exceed 90°. ⑤ The steps for lowering the pole are basically the same each time. Repeat the above process until all lowering operations are completed. S6, Removal of Tower Legs ① Remove the second-to-last section of the gantry. Install a fixed pulley at the upper 1 / 3 of the gantry. Secure the grinding rope to the main tower structure on one side of the pulley, and connect the other side to the winch via the pulley at the top of the tower. Start the winch to lower the gantry to the ground. ② The high-altitude personnel climb to the upper part of the third section of the pole, remove the connecting bolts, and dismantle the lower part of the pole. Lower the pole to a height of 2 meters on the ground and connect the pole base. ③ With 20 meters of pole remaining, raise the pole again; ④ Dismantle the tower by cutting and separating it into sections, removing the anti-theft caps, and breaking down the tower; remove the side diagonal and horizontal members from top to bottom; ⑤ Remove the remaining four main members, set up a steering trolley at the edge of the pontoon along the diagonal direction, and use the removed tower members to set up an A-frame support in the middle of the main members. The main members slowly fall along the diagonal direction. After the A-frame support is under force, remove the main members.

Images