Method for erecting and dismantling a tower by vertical rotation

Abstract

This invention relates to a method for dismantling a tower by rotating it vertically and horizontally. First, a hinge is installed at the center of the top of the tower foundation. The bottom of the second segment of the tower is hinged to the hinge. Two slide rails are fixed along the bridge direction on the bridge deck or ground behind the tower. A hydraulic cylinder is installed longitudinally along each slide rail. The end of the cylinder facing the tower is connected to a first sliding shoe, and the end away from the tower is connected to a second sliding shoe. The two sliding shoes are temporarily fixed to the slide rails using temporary positioning pins. A tripod is welded to the upper part of each of the two columns on the front side of the tower. A chain rod is installed between the two first sliding shoes and the two tripods. Then, the first segment of the tower is removed, leaving the tower vertically supported by the hinge. The hydraulic cylinders are then activated, causing the two sliding shoes to slide and position alternately along the slide rails. The chain rods pull the tower downwards, gradually rotating it to a horizontal position, allowing for dismantling at a lower position. This invention eliminates the need for large lifting equipment and reduces the risks of working at height.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology and relates to a method for dismantling a tower, specifically a method for dismantling a tower by rotating it vertically to a horizontal position. Background Technology

[0002] A pylon is a temporary structure used to install the arch ribs of an arch bridge using a diagonal-stayed method. After the arch ribs are installed, the pylon needs to be dismantled. The conventional method for dismantling a pylon is for construction workers to cut or disconnect the connections between the pylon segments one by one from the top. After disconnecting two segments, a crane is used to lift the upper segment back to the ground. This method is inefficient, requires large lifting equipment, is costly, and poses significant safety risks due to working at height. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a method for dismantling a tower by rotating it from a vertical to a horizontal position. This method involves first rotating the tower from a vertical to a horizontal position, and then dismantling it on the ground. This reduces the risks of high-altitude construction, minimizes the investment in large hoisting equipment, and improves construction efficiency.

[0004] The technical solution of the present invention is as follows:

[0005] A method for dismantling a vertically rotating and horizontally dismantling tower, characterized by the following steps:

[0006] (1) Preparations for the vertical rotation of the tower:

[0007] (11) A hinge is installed at the middle of the top of the tower foundation, and the bottom of the second segment of the tower is hinged to the hinge;

[0008] (12) Two slide rails are fixedly installed on the bridge deck or ground behind the tower along the bridge direction. The distance between the two slide rails is the same as the width of the tower in the transverse direction. A socket is provided at a certain interval along the longitudinal direction on the top surface of each slide rail. A hydraulic cylinder is installed on each slide rail along the longitudinal direction. The end of the hydraulic cylinder facing the tower is connected to the first slide shoe, and the end of the hydraulic cylinder away from the tower is connected to the second slide shoe. The two slide shoes are supported on the slide rail and can slide against the slide rail. A pin hole is provided vertically on each slide shoe. The initial state of the hydraulic cylinder is the extended state. The pin hole on each slide shoe is connected to a socket on the slide rail and a temporary positioning pin is inserted to temporarily fix the two slide shoes to the slide rail.

[0009] (13) Weld a tripod to the upper part of each of the two columns on the front side of the tower. Each tripod includes two support rods. One end of the two support rods is welded to each other, and the other end of the two support rods is welded to the tower column. The plane of the tripod is perpendicular to the front side of the tower.

[0010] (14) A chain rod is provided between the two first slip shoes and the two tripods respectively. The lower end of the chain rod is hinged to the top of the first slip shoe, and the upper end is hinged to the welded ends of the two support rods of the tripod.

[0011] (2) Remove the first section of the lower part of the tower so that the tower is vertically supported by the hinge and the tower is kept stable by the chain rod and the tower back cable;

[0012] (3) Remove the temporary positioning pin between the first sliding shoe and the slide rail. The hydraulic cylinder returns oil and contracts, causing the first sliding shoe to slide away from the tower along the slide rail. The first sliding shoe drives the chain rod to apply a pulling force to the tower towards the rear of the tower. At the same time, the tower back cable is tightened, causing the tower to rotate vertically to the rear around the hinge. After the hydraulic cylinder contracts one stroke, the first sliding shoe is fixed to the slide rail again with the temporary positioning pin. At this time, the tower is supported by the chain rod in an inclined state.

[0013] (4) Remove the temporary positioning pin between the second slide shoe and the slide rail, start the hydraulic cylinder to extend, push the second slide shoe to slide along the slide rail away from the tower for one stroke, and then use the temporary positioning pin to fix the second slide shoe and the slide rail again.

[0014] (5) Repeat steps (3) and (4) to gradually rotate the tower downwards until the tower is rotated to a horizontal position;

[0015] (6) Use temporary supports to support the tower in its horizontal position, and then disassemble the tower in sections.

[0016] This method has the following advantages:

[0017] 1. Dismantling operations are carried out on the ground, which reduces the risks associated with working at heights;

[0018] 2. No large lifting equipment is required, which reduces construction costs;

[0019] 3. Disassembly can be carried out while the tower is lying flat, allowing for the simultaneous disconnection of multiple tower segments, resulting in high construction efficiency. Attached Figure Description

[0020] Figure 1 This is a diagram showing the tower's state before the vertical rotation begins;

[0021] Figure 2 This is a schematic diagram of the planar structure of the slide rail;

[0022] Figure 3 This is a structural diagram of the hydraulic cylinder and the slippers connected to both ends of the hydraulic cylinder;

[0023] Figure 4 This is a schematic diagram showing the state after the bottom section of the tower has been removed;

[0024] Figure 5 This is a schematic diagram showing the state when the hydraulic cylinder retracts one stroke, causing the tower to rotate vertically at a certain angle.

[0025] Figure 6 This is a schematic diagram showing the state of the chain rod temporarily supporting the tilted tower and the hydraulic cylinder extending forward by one stroke.

[0026] Figure 7 This is a diagram showing the tower rotating from a vertical position to a horizontal position. Detailed Implementation

[0027] The specific embodiments of the present invention are as follows:

[0028] (1) Before the tower is erected and rotated, the following preparatory work should be carried out:

[0029] like Figure 1 , Figure 2 , Figure 3 As shown, a hinge 1 is installed in the middle of the top of the tower foundation, and the bottom of the second lower section of the tower 100 is hinged to the hinge 1. The hinge can be a steel pipe concrete hinge or a pin hinge. When a steel pipe concrete hinge is used, a support rod is welded to the bottom of the second lower section of the tower, and an arc plate is welded to the lower end of the support rod to be hinged to the steel pipe concrete hinge. When a pin hinge is used, an ear plate is welded to the bottom of the second lower section of the tower, and the ear plate is hinged to the pin hinge.

[0030] Two slide rails 2 are fixedly installed on the bridge deck or ground on the rear side of the tower 100 (usually the side of the tower with the back cable is the rear side and the side facing the arch rib is the front side) in the direction of the bridge. The slide rails can be welded or anchored to the embedded parts on the bridge deck or hardened ground to prevent displacement. The distance between the two slide rails is the same as the transverse width of the tower. A hole 21 is set at a certain interval along the longitudinal direction on the top surface of each slide rail 2. A hydraulic cylinder 3 is set on each slide rail along the longitudinal direction. The end of the hydraulic cylinder 3 facing the tower is connected to the first slide shoe 4, and the end of the hydraulic cylinder away from the tower is connected to the second slide shoe 5. The two slide shoes are supported on the slide rail and can slide against the slide rail. A pin hole 6 is set vertically on each slide shoe to set the initial state of the hydraulic cylinder to the extended state. The pin hole on each slide shoe is connected to a hole on the slide rail and a temporary positioning pin 7 is inserted to temporarily fix the two slide shoes to the slide rail.

[0031] On the two pillars on the front side of the tower, a tripod 8 is welded near the top of the pillar. Each tripod includes two support rods. One end of the two support rods is welded to each other, and the other end of the two support rods is welded to the tower pillar. The plane of the tripod is perpendicular to the front side of the tower.

[0032] A chain rod 9 is respectively installed between the two first slip shoes 4 and the two tripods 8. The lower end of the chain rod 9 is hinged to the top of the first slip shoe 4, and the upper end is hinged to the welded ends of the two support rods of the tripod 8.

[0033] After the above preparations are completed, release the guy ropes of tower 100, retain the back cable 10 of tower, and begin the tower vertical rotation operation.

[0034] (2) such as Figure 4As shown, the first section of the lower part of the tower is cut and removed so that the tower 100 is vertically supported by the hinge 1, and the tower is kept vertically stable by the chain rod 9 and the tower back cable 10, thus completing the system conversion.

[0035] (3) Then as Figure 5 As shown, the temporary positioning pin 7 between the first sliding shoe 4 and the slide rail 2 is removed, the hydraulic cylinder 3 retracts and retracts, causing the first sliding shoe 4 to slide along the slide rail away from the tower. At the same time, the first sliding shoe 4 drives the chain rod 9 to apply a pulling force to the tower towards the rear of the tower, and tightens the tower back cable 10, causing the tower 100 to rotate vertically to the rear around the hinge 1. After the hydraulic cylinder 3 retracts one stroke, the first sliding shoe 4 and the slide rail 2 are re-fixed with the temporary positioning pin 7. At this time, the tower is supported by the two chain rods in an inclined state.

[0036] (4) such as Figure 6 As shown, remove the temporary positioning pin between the second sliding shoe 6 and the slide rail, start the hydraulic cylinder 3 to extend, push the second sliding shoe 6 to slide along the slide rail 2 away from the tower by one stroke, and then use the temporary positioning pin 7 to fix the second sliding shoe 6 and the slide rail again to complete one stroke of vertical rotation of the tower.

[0037] (5) Repeat steps (3) and (4) above to gradually rotate the tower 100 downwards until it is rotated to the desired position. Figure 7 The supine position shown.

[0038] (6) Use pads or beams to temporarily support the flat tower 100, and then disassemble the tower in sections.

Claims

1. A method for dismantling a tower by rotating it vertically and then horizontally, characterized in that, Includes the following steps: (1) Preparations for the vertical rotation of the tower: (11) A hinge is installed at the middle of the top of the tower foundation, and the bottom of the second segment of the tower is hinged to the hinge; (12) Two slide rails are fixedly installed on the bridge deck or ground behind the tower along the bridge direction. The distance between the two slide rails is the same as the width of the tower in the transverse direction. A socket is provided at a certain interval along the longitudinal direction on the top surface of each slide rail. A hydraulic cylinder is installed on each slide rail along the longitudinal direction. The end of the hydraulic cylinder facing the tower is connected to the first slide shoe, and the end of the hydraulic cylinder away from the tower is connected to the second slide shoe. The two slide shoes are supported on the slide rail and can slide against the slide rail. A pin hole is provided vertically on each slide shoe. The initial state of the hydraulic cylinder is the extended state. The pin hole on each slide shoe is connected to a socket on the slide rail and a temporary positioning pin is inserted to temporarily fix the two slide shoes to the slide rail. (13) Weld a tripod to the upper part of each of the two columns on the front side of the tower. Each tripod includes two support rods. One end of the two support rods is welded to each other, and the other end of the two support rods is welded to the tower column. The plane of the tripod is perpendicular to the front side of the tower. (14) A chain rod is provided between the two first slip shoes and the two tripods respectively. The lower end of the chain rod is hinged to the top of the first slip shoe, and the upper end is hinged to the welded ends of the two support rods of the tripod. (2) Remove the first section of the lower part of the tower so that the tower is vertically supported by the hinge and the tower is kept stable by the chain rod and the tower back cable; (3) Remove the temporary positioning pin between the first sliding shoe and the slide rail. The hydraulic cylinder returns oil and contracts, causing the first sliding shoe to slide away from the tower along the slide rail. The first sliding shoe drives the chain rod to apply a pulling force to the tower towards the rear of the tower. At the same time, the tower back cable is tightened, causing the tower to rotate vertically to the rear around the hinge. After the hydraulic cylinder contracts one stroke, the first sliding shoe is fixed to the slide rail again with the temporary positioning pin. At this time, the tower is supported by the chain rod in an inclined state. (4) Remove the temporary positioning pin between the second slide shoe and the slide rail, start the hydraulic cylinder to extend, push the second slide shoe to slide along the slide rail away from the tower for one stroke, and then use the temporary positioning pin to fix the second slide shoe and the slide rail again. (5) Repeat steps (3) and (4) to gradually rotate the tower downwards until the tower is rotated to a horizontal position; (6) Use temporary supports to support the tower in its horizontal position, and then disassemble the tower in sections.

2. The method for dismantling a tower by vertical rotation and horizontal relocation according to claim 1, characterized in that: The hinge is either a steel-concrete composite hinge or a pin hinge. When a steel-concrete composite hinge is used, a support rod is welded to the bottom of the second segment below the tower, and an arc-shaped plate is welded to the lower end of the support rod to hinge with the steel-concrete composite hinge. When a pin hinge is used, an ear plate is welded to the bottom of the second segment below the tower, and the ear plate is hinged with the pin hinge.

Images