Dismantling method for guyed transmission towers

Abstract

To provide a low-cost, highly efficient method for dismantling guyed transmission towers. [Solution] The method for dismantling a guyed steel pole involves designating the installation position of at least one guy wire, which is installed below the midpoint in the height direction, as the buckling support point of the steel pole, and releasing the tension on that guy wire. A pull-in wire installed at the buckling support point is used to horizontally displace the buckling support point in the opposite direction to the guy wire from which the tension is released, forcing the steel pole to buckle under its own weight from the buckling support point. As a result, the steel pole self-destructs.

Description

Technical Field

[0001] The present invention relates to a method for disassembling a branch-type iron tower.

Background Art

[0002] A number of removal works for branch-type iron towers that were used for radio broadcasting are planned.

[0003] As a method for removing a branch-type iron tower, there is the erector method. The erector method is a method with proven track during the construction of the iron tower. An erector is assembled at the base of the iron tower by a truck crane, lifted to the top of the iron tower, and then disassembled sequentially from the top of the tower using this erector.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, although the erector method is a stable method with proven track during the construction of the iron tower, since all the disassembly work is carried out at heights, there are problems such as danger, poor workability and work efficiency, and high removal costs.

[0006] Therefore, an object of the present invention is to provide a method for disassembling a branch-type iron tower with low cost and high efficiency as compared with the conventional disassembly methods.

Means for Solving the Problems

[0007] One aspect of the present invention is a method for dismantling a guyed steel pole, wherein the installation position of at least one guy wire of the guy wires supporting the guyed steel pole, which is installed below the midpoint in the height direction, is designated as the buckling support point of the steel pole, the tension of the one guy wire is released, and the buckling support point is horizontally displaced in the opposite direction to the guy wire from which the tension is released by a pull-in wire installed at the buckling support point, thereby forcibly buckling the steel pole by its own weight from the buckling support point, and dismantling the steel pole. [Effects of the Invention]

[0008] According to the present invention, a low-cost, highly efficient method for dismantling guyed steel towers can be provided. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a diagram illustrating the method for dismantling the guyed tower of this embodiment. [Figure 2] Figure 2 is a diagram illustrating the method for dismantling the guyed tower of this embodiment. [Figure 3] Figure 3 is a diagram illustrating the method for dismantling the guyed tower of this embodiment. [Modes for carrying out the invention]

[0010] An embodiment of the present invention is a method for dismantling a guyed steel tower, which aims to dismantle it by causing forced buckling due to its own weight.

[0011] One method to induce forced buckling involves designating the installation point of at least one guy wire supporting the tower, located below the midpoint in the height direction, as the buckling support point for the tower, and releasing the tension on that guy wire. Releasing the tension is done by loosening or cutting the guy wire. Then, using a pull-in cable installed at the buckling support point, the buckling support point is horizontally displaced in the opposite direction to the guy wire from which the tension was released, causing the tower to buckle under its own weight. As a result, the tower collapses to the ground, and the tower can be dismantled.

[0012] The guy wire that releases tension is preferably the lowest guy wire among the guy wires supporting the tower, and the buckling support point is preferably at the position where the lowest guy wire is attached to the tower. Furthermore, it is preferable that the pull-in cable be installed in the opposite direction from the guy wire that releases tension.

[0013] Next, a specific embodiment will be described. Figures 1 and 2 are diagrams illustrating the method of dismantling a guyed tower according to this embodiment. 1 is the tower, 2 is the base of the tower, and A, B, and C are groups of guy wires in three directions.

[0014] The details of the transmission tower 1 to be dismantled are as follows, as shown in Figure 1. The height of transmission tower 1 is 45m. • The wires are supported in three directions at 120-degree angles. The unidirectional wires A, B, and C are supported in four sections at approximately 10m intervals from the base 2 on the tower side. The foundations of the first-stage wires A1, B1, and C1, and the second-stage wires A2, B2, and C3, are supported at a point approximately 15m in radius from the base 2 on the tower 1 side. The foundations of the third-stage wires A3, B3, and C3, and the fourth-stage wires A4, B4, and C4, are supported at a point approximately 20m in radius from the base 2 on the tower 1 side.

[0015] This method involves pulling down a guyed steel tower, which is supported and erected by the above configuration, in one direction within 60 meters of its foundation.

[0016] As shown in Figure 2, the pulling direction of the pull wire 3 is set to the intermediate direction X between the two wires B and C, one end of the pull wire 3 is attached to the buckling support position 4 of the tower 1 (the binding position of the lowest wire A1), and the other end of the pull wire 3 is appropriately fastened to a foundation located approximately 30m from the base 2 on the tower 1 side.

[0017] Next, the wire A1 on the opposite side of the pulling direction is loosened, and the pulling wire 3 is subjected to a predetermined tension, causing the buckling support position 4 to be displaced horizontally.

[0018] As a result, as shown in FIG. 3, due to the self-weight of the tower 1, buckling occurs from the buckling fulcrum position 4, and the tower 1 self-destructs.

[0019] Compared with the conventional dismantling method, the present embodiment can dismantle the branch-type tower at low cost and high efficiency.

Explanation of Reference Numerals

[0020] 1 Tower 2 Base of the tower 3 Pulling wire 4 Buckling fulcrum position A Branch wire B Branch wire C Branch wire

Claims

1. A method for dismantling a guyed steel pole, Of the guy wires supporting a guyed steel pole, the installation position of at least one guy wire below the midpoint in the height direction is defined as the buckling support point of the steel pole. The tension on the aforementioned support wire is released, The pull-in wire installed at the buckling support point position horizontally displaces the buckling support point in the opposite direction to the guy wire that releases the tension. The steel column is forced to buckle under its own weight from the aforementioned buckling support point. The aforementioned steel pillars will be dismantled. Method for dismantling guy wire type steel poles.

2. The guy wire that releases the tension is the one installed on the lowest level. A method for dismantling a guyed steel pole as described in claim 1.

3. The aforementioned guyed steel pole is a guyed steel pole for medium-wave radio broadcasting. A method for dismantling a guyed steel pole according to claim 1 or claim 2.

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