JPS6128680A - Rising construction method of transmission iron tower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] In recent years, with the increasing density in urban areas, power transmission towers are being constructed in close proximity to existing power transmission lines. Due to the insufficient separation distance between the lines, it becomes necessary to relocate the power transmission lines to a higher position.

The present invention relates to a construction method for increasing the height of a steel tower in such a situation.

[Prior art and problems]

Conventionally, this type of raising method involves installing a frame structure on the outside of the steel tower and raising the upper beam that supports the upper steel tower using a cylinder, or placing it on a lifting platform provided inside the frame structure. The upper part of the steel tower was raised from below,
There are methods of attaching the lower part of the steel tower below it (Japanese Patent Publication No. 50-32526, Japanese Patent Publication No. 48-26614).

However, these construction methods require a large work site, especially since the framework structure is installed outside the tower, and it is impossible to carry out the raising work in narrow spaces where such land is not available or in cases where it is difficult to secure land. There was a certain drawback.

In addition, since it takes time to assemble the framework structure,
The disadvantages were that the raising work required long power outages or the construction of temporary towers for bypass power transmission.

[Means for solving problems]

The present invention solves the above-mentioned drawbacks, and its means include raising unit steel pipes along the tower core to the top while sequentially connecting unit steel pipes using an upper pulley rope or the like attached to the top of the tower body of an existing steel tower.
The ground wire was temporarily relocated to the arm at the top of the tower, and the single-column steel pipe tower, which was constructed by connecting a predetermined number of unit steel pipes, was raised to a predetermined height from the top of the tower using a lower pulley rope attached to the bottom of the tower. The lower end of the unit steel pipe connected to the lowest part of the single-column steel pipe tower is fixed by the basic concrete company, and after the tower is raised, the single-column steel pipe tower is fixed and supported by the opposing side members of the steel tower.
The purpose was to relocate the ground wire to the single-column steel pipe tower and install an arm, relocate the electric wires from the old arm of the steel tower to the arm, and dismantle and remove the old arm and the tower body of the old arm part. A steel pipe tower is used as a raised steel tower.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is an existing steel tower, and a single column steel pipe tower 2 will be constructed within this steel tower 1.

This single-column steel pipe tower 2 is assembled by the following construction method.

(a) As shown in FIG. 2, the upper pulley 3 is suspended from the top of the tower body of the steel tower 1, and the opposing sap material that gets in the way of work inside the steel tower 1 is removed.

(b) The upper wire row 15 unwound from the winding drum of the upper hoist 4 installed on the ground is hooked onto the above-mentioned upper pulley 3 via a guide pulley and is suspended within the steel tower 1.

(c) The required number of unit steel pipes 2a of a predetermined length are carried onto the ground within the steel tower 1.

(d) At a position approximately 1/3 of the tower height below the tower body top force of steel tower 1 and where the horizontal member 1a is located, and approximately 1 tower height from the ground.
/3 Attach the guide mechanisms 6 to the same locations up respectively.

As shown in FIG. 6, in this guide mechanism 6, a guide roller 6a connects the other end of four support wire ropes 6c fastened to a frame 6b having a plurality of pid rollers 6a to a steel tower.
Fasten it to the four corners of the horizontal member 1a so that it is located at the center of the horizontal member 1a.

(e) Tie the upper end of the carried-in unit steel pipe 2a to the hanging end of the upper wire rope 5, operate the upper hoisting machine 4 to lift the unit steel pipe 2a, and flange-join the next unit steel pipe 2a below it. While passing through the guide rollers 6a in item 1, the wires are successively connected and lifted until the upper wire lobe 50 winding allowance limit (near the top of the tower body) is reached.

(f) As shown in Figure 3, from the ground of steel tower 1, 11
] 1 degree i + Y (1 (about l m), horizontal lit
1 Lower pulleys 7 are suspended diagonally from a location a, and a single-column steel pipe tower 2 connected with the predetermined number of unit steel pipes 2a is raised from the shell of two lower hoists 8 installed on the ground. The lower wire rope 9 is let out, looped around the lower track 7 via the guide pulley, and suspended within the steel tower 1.

(g) Attach temporary arm IO to arm 1b at the top of the tower body,
The ground wire 11 at the tower top is temporarily relocated to this temporary arm 10, and the tower top is dismantled and removed.

(h) Hook the hooks at each tip of the lower wire rope 9 to the lower part of the lowest unit steel pipe 2a of the single-column steel pipe tower 2 (at this time, remove the upper pulley 3), and operate the lower hoisting tJ18 to Raise the steel pipe 2 above the top of the tower.

(i) To raise the height to a predetermined height, add unit steel pipes 2a to the lowest end of the single-column steel pipe tower 2 at the required rate, and
A is fixed to anchor bolts of foundation concrete 15 cast on the ground in advance.

(j) As shown in Figure 4, the opposite side is placed at the required location on the steel tower 1)
The fAIC is attached, and the single-column steel pipe tower 2 is fixed to the opposite side member 1c so as to be located at the tower core.

(k) Relocate the ground wire 11 to the top of the single-column steel pipe tower 2.

(j2) Stop the power transmission line on one side, attach each arm 12, 13, and 14 on one side to the single-column steel pipe tower 2, and transfer each electric wire of the old arm to this.

The old arm will be dismantled and removed, and the one-sided power transmission line will be restored.

(m) Other side J゛ [h times + jf, above (p)
Do the same work.

(n) Dismantle and remove the tower body of the old arm part of the double-feed line.
Ru.

Through the above steps, the raised steel tower shown in Fig. 5 is completed.

[Suj fruit]

(a) Existing steel towers can be raised safely and quickly within the site.

(b) The tower-shaped steel tower section surrounds the lower part of the lowest arm of the single-column steel pipe tower, and the opposite side supports the single-column steel pipe tower, so the tower-shaped steel tower section absorbs horizontal loads. The vehicle column steel pipe tower only needs to share the vertical load, so its outer diameter can be small and economical.

(C) Since the arm is attached to a small-diameter single-column steel pipe tower,
Its overhang width can be made smaller than the arm overhang width of the old steel tower, and less land is required under the electric wires.

(d) Since turbulence with respect to the wind direction occurs in the tower-shaped steel tower portion, rectification is less likely to occur in the single-column steel pipe tower, and therefore the occurrence of vibration can be suppressed.

In addition, in the present invention, the method of raising the height of an existing steel tower has been described, but as mentioned above, the lower half of a single-column steel pipe tower fixed to the foundation concrete is surrounded by a tower-shaped steel tower.
In addition, the steel pipe base is supported by the opposite side shrine, and the single-column steel pipe tower takes the vertical load, and the tower-shaped steel tower takes the horizontal load, so this is the configuration when constructing a new power transmission tower. It is also possible to apply it to

[Brief explanation of drawings]

Figure 1 is a front view of the existing steel tower, Figures 2 to 4 are explanatory diagrams of an embodiment of the raising method according to the present invention, Figure 5 is a front view after the raising is completed, and Figure 6 is the guide mechanism. FIG. 1... Existing steel tower, 2... Single column steel pipe tower, 2a... Unit steel pipe, 3... Upper pulley, 4... Upper hoisting machine, 5
... Upper wire lobe, 6... Guide mechanism, 7.
...Lower pulley, 8...Lower hoist, 9...Lower wire rope, 10...Temporary arm, 11...Ground wire,
12, 13, 14...Arm, 15...Foundation concrete. Patent applicant: Yamaka Dengyo Co., Ltd.
Sanwa Koki Co., Ltd. Figure 3 Inchiku 4 No. 5 En

Claims (1)

[Claims] The unit steel pipes are successively connected using an upper pulley rope attached to the top of the existing steel tower, and raised along the tower core to the top.The ground wire is temporarily relocated to the arm at the top of the tower, and a predetermined number of unit steel pipes are connected. A single-column steel pipe tower consisting of is raised from the top of the tower to a specified height using a lower pulley rope attached to the bottom of the tower, and the lower end of the unit steel pipe connected to the lowest part of the single-column steel pipe tower is fixed to the foundation concrete. , After raising the height of the steel tower, the single-column steel pipe tower is fixedly supported by the opposing side members of the steel tower, the ground wire is transferred to the single-column steel pipe tower, and an arm is attached, and the electric wire of the old arm of the steel tower is transferred to the arm, A method of raising the height of a power transmission tower, which is characterized by dismantling and removing the old arm and the tower body of the old arm part.