JP2010043505A - Method of replacing main pole member of steel tower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main pole member replacing method allowing the replacement of a main pole member at a cross arm mounting part without transferring an electric wire to a temporary steel tower in an existing steel tower for power transmission constituted of steel members of angle steel. <P>SOLUTION: The main pole member replacing method for reinforcing a main pole member replacement panel to replace the main pole member includes steps of mounting temporary main pole members to two tower body faces not mounted with cross arms in the existing steel tower for power transmission constituted of steel members of angle steel; connecting the upper end of each temporary main pole member and a diagonal member mounting position of a temporary main pole member mounting face by a connecting temporary main pole member; connecting the lower end of each temporary main pole member and the diagonal member mounting position of the temporary main pole member mounting face by a connecting temporary main pole member; forming a truss structure between the two temporary main pole members; and mounting a temporary crossarm hanging member to the tip part of the crossarm from the truss structure between the temporary main pole members. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a main column material replacement method that enables replacement of a main column material at an armrest attachment location without transferring an electric wire to a temporary tower in an existing power transmission tower composed of angle steel. is there.

  An example of an existing steel tower for power transmission is shown in FIGS. The steel tower is composed of four main pillar members, abdominal members made of a plurality of diagonal members and horizontal members forming a truss structure, and a plurality of braces that support electric wires. The main pillar material is supported by a foundation body embedded in the ground and arranged in a square shape. The abdomen is fixed to each main column member so as to connect the four main column members, and constitutes four surfaces of the truss structure between the four main column members. When a member constituting the steel tower is corroded or damaged by an earthquake or the like, it is necessary to replace the member.

  Of the member replacement work, the replacement work of the main pillar material, which is the main component material having a greater stress than the other members, is a very difficult task. Conventionally, the following methods have been proposed as methods for replacing the main pillar material of a steel tower.

  It is used when replacing the main pillar material of a steel tower.A replacement device is attached to a healthy main pillar material located above and below the replacement main pillar material, and the hydraulic cylinder is pushed out to reduce the stress generated in the replacement main pillar material. A main pillar material replacement device that replaces the main pillar material by receiving it with the replacement device has been proposed (see, for example, Patent Document 1).

  A temporary steel tower was put on the upper part of the existing steel tower, and the electric wires supported by the existing steel tower were transferred to the temporary steel tower, and the stress generated in the members on the upper part of the existing steel tower was reduced and covered with the temporary steel tower. There has been proposed a method of exchanging members at the upper part of an existing steel tower (for example, see Patent Document 2).

JP-A-8-163729 JP 2002-147064 A

  However, when replacing the main column material at the armrest mounting location using the conventional main column material replacement device, the main column material of a general steel tower is not straight from the top to the bottom of the tower, but the lower armrest There is a bend at the lower surface position of the main column material replacement device, because the main column material replacement device is attached to a healthy main column material located above and below the replacement main column material. There was a problem that it could not be installed.

  In the case of the method of providing a temporary steel tower by covering the upper part of the existing steel tower, it is possible to replace the main pillar material of the arm bracket mounting location, but it is necessary to transfer the electric wire supported by the existing steel tower to the temporary steel tower Therefore, there is a problem that the work becomes large. Further, in order to remove the main pillar material to be replaced, it is necessary to remove all the healthy members above the replacement main pillar material, which has a problem in that work efficiency is poor and work takes time.

  In order to advantageously solve the above-described problem, the main column material replacement method of the steel tower of the present invention is an existing steel tower for power transmission made of steel of angle steel, and the arm of the four tower surfaces of the existing steel tower From the step of attaching the temporary main column material so that the upper end and the lower end of the main column material replacement panel are connected to the center position of the two surfaces where gold is not attached, the upper end portion of the temporary main column material, and the upper end portion of the temporary main column material Connect the diagonal mounting position of the existing main column material on the temporary main column mounting surface on the upper side of one panel with the connecting temporary main column material, and between the mounting positions on the upper end side of the connection temporary main column material on the same tower surface Temporary horizontal material mounting step, the lower end portion of the temporary main column material, and the diagonal material mounting position of the existing main column material on the temporary main column material mounting surface one panel below the lower end portion of the temporary main column material Connecting with the main column material, attaching the temporary horizontal material between the mounting positions on the lower end side of the connection temporary main column material on the same tower surface, and the truss between the two temporary main column materials Forming the structure and removing the existing armrest suspension material of the armrests attached to the replacement main pillar material, and attaching the temporary armrest suspension material from the truss structure between the provisional main pillar materials to the tip of the armrest This is a construction method in which the main pillar material replacement panel is reinforced by the process and the main pillar material to be replaced is replaced.

  According to the main pillar material replacement method of the steel tower of the present invention, by installing a temporary main pillar material to the main pillar material replacement panel of the existing tower and reinforcing the main pillar material replacement panel, the temporary tower is installed, Since the main pillar material at the armrest attachment location can be replaced without relocating the electric wire, the work does not become large and the work time can be shortened.

  An example of an existing steel tower for power transmission is shown in FIGS. The steel tower A is composed of four main pillars 1, an abdomen composed of a plurality of diagonal members 2 and a horizontal member 3 forming a truss structure, and a plurality of braces 4 that support the electric wires 7. The main pillar 1 is supported by a base body 5 that is embedded in the ground and arranged in a square shape. The abdomen is fixed to each main column 1 so that the four main columns are connected to each other, and the four surfaces D1, D2, D3, D4 of the truss structure are formed between the four main columns. is doing. In addition, in the figure, 6 is a main pillar material connection position, C1-C12 has shown the panel.

  When a member constituting the steel tower is corroded or damaged by an earthquake or the like, it is necessary to replace the member. In the replacement work of the members, it is very difficult to replace the main pillar material, which is the main component material having a greater stress than the other members. There is only a very large replacement method with relocation. The present invention is a main column material replacement method in which, in an existing power transmission tower A composed of angle steel, the main column material can be replaced at the arm bracket attachment location without transferring the electric wire 7 to the temporary tower. A case where the main pillar material of the C5 to C8 panel of FIG. 17 is replaced will be described as an example of the present invention.

  1 is a front view of an existing steel tower with a temporary main column attached, FIG. 2 is a cross-sectional view taken along the line aa in FIG. 1, FIG. 3 is a diagram showing a state in which the existing steel tower is installed, and FIG. FIG. 5 is a front view of the existing steel tower from which the inner diagonal member is removed and the temporary main pillar material is attached. In the figure, reference numeral 18 denotes a brace material, C5 to C8 panels represent main column material replacement panels B, and parallel diagonal lines (hatched) indicate the replacement main column materials 8. A circle symbol in the figure indicates the bolt position 11.

  In the first step of the main column material replacement method of the present invention, as shown in FIGS. 1 and 2, in the existing tower A for power transmission composed of steel of angle steel, the four tower surfaces of the existing tower A The temporary main pillar material 9 is attached so that the upper end and lower end of the main pillar material replacement panel B are connected to the center position of the two surfaces D1 and D3 where the arm 4 is not attached among D1, D2, D3, and D4. At this time, as shown in FIG. 3, when the diagonal member 2 is attached to the inner side of the main column member 1 (hereinafter referred to as the internal 2a) or the outer side of the main column member 1 (hereinafter referred to as the external 2b), In order to attach the column 9 to the center position of the tower surfaces D1 and D3 so as to connect the upper end and the lower end of the main column replacement panel B, as shown in FIG. Remove 2a. As shown in FIG. 5, after the temporary main column 9 is attached so that the upper end and the lower end of the main column replacement panel B are connected to the center position of the tower surfaces D1 and D3 to which the arm 4 is not attached, FIG. As shown, the new diagonal member 10 is attached to the position of the removed diagonal member 2a. Both ends of the new diagonal member 10 are fixed to the main column members so as to connect the existing main column members 1 and the temporary main column members 9.

  FIG. 6 is a view showing an attachment state of the connection temporary main pillar material, FIG. 7 is a view showing the attachment state of the connection temporary main pillar material viewed from the line bb in FIG. 6, and FIG. It is the attachment state figure of the temporary main pillar material for connection.

  In the second step, as shown in FIGS. 6 and 7, the upper end portion of the temporary main column member 9 attached to the main column material replacement panel B of the existing tower A in the first step, and the temporary main column member 9 A connecting temporary main column member 12 connects the diagonal material mounting positions of the existing main column members 1 on the temporary main column member mounting surfaces D1 and D3 one panel above the upper end portion C4. The temporary horizontal member 15 is attached between the mounting positions on the upper end side of the column member 12. First, in order to attach the temporary connecting main column material 12 for connection, the existing diagonal members 2 on the temporary main column material mounting surfaces D1 and D3 on the upper panel C4 from the upper end of the temporary main column material 9 are removed. Next, as shown in FIG. 6, the upper end portion of the temporary main column member 9 and the existing main column member 1 on the temporary main column member mounting surfaces D <b> 1 and D <b> 3 at one panel upper side C <b> 4 from the upper end portion of the temporary main column member 9. The diagonal material mounting position is connected to the connecting temporary main pillar material 12. The temporary horizontal member 15 is attached between the attachment positions on the upper end side of the connection temporary main pillar member 12 on the same tower surface. Further, as shown in FIG. 7, a cross-sectional member 13 is attached in a cross shape between the connection temporary main column member 12 and the connection temporary main column member 12 on the tower body surface.

  In the third step, as shown in FIGS. 6 and 8, the lower end portion of the temporary main column 9 attached to the main column material replacement panel B of the existing tower A in the first step, and the temporary main column 9 The diagonal main material 1 is connected to the diagonal main material 1 of the existing main pillar 1 on the temporary main pillar material mounting surfaces D1 and D3 at a position C9 below the lower end by the connecting temporary main pillar 12 and is connected to the same column surface. The temporary horizontal member 15 is attached between the mounting positions on the lower end side of the column member 12. First, in order to attach the temporary connecting column 12 for connection, the existing diagonal members 2 on the temporary main column mounting surfaces D1 and D3 on the lower panel C9 are removed from the lower end portion of the temporary main column 9. Next, as shown in FIG. 6, the temporary main column member 9 has the lower end portion and the existing main column member 1 on the temporary main column member mounting surfaces D <b> 1 and D <b> 3 at one panel downward C <b> 9 from the lower end portion of the temporary main column member 9. The diagonal material mounting position is connected to the connecting temporary main pillar material 12. The temporary horizontal member 15 is attached between the attachment positions on the lower end side of the connection temporary main pillar member 12 on the same tower surface. Further, as shown in FIG. 8, a cross-sectional member 13 is attached in a cross shape between the connecting temporary main column member 12 and the connecting temporary main column member 12 on the tower body surface.

  FIG. 9 is a diagram showing a truss structure formed between temporary main column members as viewed from the line dd in FIG. 6, and FIGS. 10 and 11 are examples of cross-sectional views taken along the line ee in FIG. The horizontal members 3 in the hatched lines in FIGS. 10 and 11 indicate the horizontal members 3 to be removed.

  In the fourth step, as shown in FIG. 9, truss structures E1, E2, E3, E4 are formed using a plurality of temporary diagonal members 14 and temporary horizontal members 15 between two temporary main pillar members, The main pillar 9 is reinforced. The truss structures E1, E2, E3, and E4 between the temporary main pillars in the figure show examples in accordance with the structure of the abdomen of the existing steel tower A. At this time, as shown in FIGS. 10 and 11, the cross section of the steel tower at the position where the arm bracket is attached is obtained by removing the existing horizontal member 3 from the arm metal attaching surface D4 on the replacement main pillar material side, and between the arm metal main parts 22 near the tower body. The reinforcing horizontal member 16 is attached so as to connect the cross section, and the cross-section member 13 is attached in a cross shape inside the steel tower to reinforce the cross section of the steel tower at the position where the arm bracket is attached.

  FIG. 12 is a front view of an existing steel tower to which a temporary arm metal suspension member is attached, FIG. 13 is a view showing a state in which a vertical reinforcing member is attached to the truss structure portion, and FIG. 14 is a temporary arm metal as seen from the line ff in FIG. It is an attachment state figure of a hanging material. In the fifth step, as shown in FIGS. 12 to 14, the truss structure part formed between the temporary main column members by removing the existing armrest suspension members 18 of the arm members 4 attached to the main column member replacement panel B. The temporary arm metal suspension member 17 is attached to the tip of the arm metal 4 from E1 and E4. First, in order to support the brace 4 with the truss structure portions E1 and E4 formed between the temporary main column members, as shown in FIG. 13, the vertical reinforcing member 20 is attached to the truss structure portions E1 and E4. As shown in FIG. 14, the vertical reinforcement member 20 is provided with a metal arm 19 for a temporary arm metal suspension material for attaching the temporary arm metal suspension material 17, and the existing arm metal suspension material of the arm metal 4 on the replacement main pillar material side. 18 is removed, and the temporary arm metal suspension material 17 is attached so as to connect the truss structure parts E1 and E4 and the distal end portion of the arm metal 4 via the temporary arm metal suspension metal fitting 19 attached to the vertical reinforcing member 20.

  FIG. 15 is a front view of the existing steel tower after the replacement main pillar material is removed, and FIG. 16 is a front view showing the structure of the steel tower after the replacement main pillar material is removed. As shown in FIG. 16, in the first to fifth steps, the main column material replacement panel B is reinforced by the temporary main column material 9 or the like, so that the truss structure shown by the solid line in FIG. 16 when the main column material is replaced. Since the stress is transmitted, the temporary main column material 9 bears the stress generated in the replacement main column material 8, and even if the existing main column material 1 is removed as shown in FIG. The steel tower A will not collapse. In FIG. 16, the broken line portion indicates the shape of the existing steel tower when the main pillar material is replaced.

  When replacing the main column material, remove the bolts of the members attached to the replacement main column material 8, remove the replacement main column material 8, and install the new main column material. The truss structures E1, E2, E3, E4 between the main column 12 and the temporary main column are removed. Next, the existing diagonal member 2 removed in the second and third steps, the existing horizontal member 3 removed in the fourth step, the existing arm metal suspension member 18 removed in the fifth step, etc. are attached, and the main pillar material The replacement work is completed.

  Thus, according to the main column material replacement method of the steel tower of the present invention, the temporary column material replacement panel B is reinforced with the temporary main column material 9 or the like, so that the temporary steel tower is installed and the electric wires 7 are transferred. Therefore, it is possible to replace the existing main pillar material at the location where the arm bracket is attached, and the work time can be shortened.

  Front view of existing steel tower with temporary main column   Sectional drawing which follows the aa line of FIG.   Diagram of diagonal installation of existing steel tower   Front view of the existing tower with the internal diagonal removed   Front view of an existing steel tower with internal diagonal members removed and temporary main pillars attached   Connection state diagram of temporary column for connection   FIG. 6 is a view showing the connection state of the temporary connecting pillar material for connection as seen from the line bb in FIG.   FIG. 6 is a view showing the connection state of the temporary connecting pillar material for connection as seen from the line cc in FIG.   The figure which shows the truss structure formed between the temporary main pillar materials seen from the dd line of FIG.   Example of sectional view along line ee in FIG.   Example of sectional view along line ee in FIG.   Front view of an existing steel tower with a temporary arm suspension   Installation diagram of vertical reinforcement on truss structure   FIG. 13 is a view showing the state of attachment of the temporary arm suspension member viewed from the line ff in FIG.   Front view of the existing steel tower after the replacement main pillar material is removed   Front view showing the structure of the steel tower after the replacement main pillar material is removed   Front view showing the structure of an existing tower for power transmission   Top view showing the structure of an existing tower for power transmission

Explanation of symbols

A Existing steel tower B Main column material replacement panel C1 to C12 Panel D1 to D4 Tower surface E1 to E4 Truss structure part 1 Main column material 2 Diagonal material 2a Internal diagonal material 2b External diagonal material 3 Horizontal material 4 Arm metal 5 Base body 6 Main column material connection position 7 Electric wire 8 Replacement main column material 9 Temporary main column material 10 New diagonal material 11 Bolt position 12 Temporary main column material 13 for connection Cross section member 14 Tempered diagonal material 15 Temporary horizontal material 16 Reinforced horizontal material 17 Temporary arm Metal hanger 18 Arm metal hanger 19 Temporary metal hanger bracket 20 Vertical reinforcement 21 Arm metal main material

Claims (1)

In the existing steel tower for power transmission composed of steel of angle steel,
The step of attaching the temporary main column material so as to connect the upper end and the lower end of the main column material replacement panel to the center position of the two surfaces of the four tower bodies of the existing steel tower where the armor is not attached,
Connect the upper end of the temporary main column and the diagonal mounting position of the existing main column on the temporary main column mounting surface one panel above the upper end of the temporary main column with the connection temporary main column. A step of attaching a temporary horizontal material between the mounting positions on the upper end side of the temporary main pillar material for connection of the tower surface,
Connect the lower end of the temporary main column and the diagonal mounting position of the existing main column on the temporary main column mounting surface one panel below the lower end of the temporary main column with the connection temporary main column. A step of attaching a temporary horizontal material between the attachment positions on the lower end side of the temporary main pillar material for connection of the tower surface,
Forming a truss structure between the two temporary main pillars;
Removing the existing armrest suspension material of the armrest attached to the replacement main pillar material, and attaching the temporary armrest suspension material from the truss structure between the temporary main pillar materials to the tip of the armrest;
The main column material replacement construction method of the steel tower, which reinforces the main column material replacement panel and replaces the main column material.

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