JPH05113033A - Steel wire tensing method for double flanged pole and device therefor - Google Patents

Abstract

PURPOSE:To make a job performable with one type tension holder at the time of manufacturing each of flanged poles different in length by eliminating any cutting work of a steel wire after forming. CONSTITUTION:In a steel wire tensing method for a double flanged pole, wherein two flanges 2, 3 are inset at both sides of a cylindrical pole form 1, a steel wire 4 is stretched across between these two flanges 2 and 3, and one side flange 2 is tensed while tension is given to the steel wire 4, then this wire 4 is expanded as much as the specified value, a cylindrical reinforcing band 9 is installed at an opposite surface side of the flange 2 at the tension side while inserted into the pole form 1 so as to slide freely. In addition, length of the steel wore 4 is preset to be short as far as a portion for length to be expanded by tension, the tension side flange 2 is pulled in an extraction direction from the pole form 1 as keeping the state that the reinforcing band 9 is inserted into the pole form 1. In succession, the steel wire 4 is drawn out as long as the specified value and its length is kept so as to accord with the specified length of the pole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for tensioning a steel wire for a pole with two flanges used for an intermediate pole of a long pole having three or more splices, and its apparatus.

[0002]

2. Description of the Related Art Long poles with three or more splices are used in various fields such as river crossing poles for power distribution lines, various ball nets for golf driving ranges, lighting poles, etc. Is used for.

The conventional long pole (B) has a slit type as shown in FIG. 5 and has no flange and has an excellent appearance. In addition, since there is no flange protruding from the pole body, the flange interferes with the ascending pole work. There was no such thing as being, and there was an advantage that construction was easy.

On the other hand, with the passage of time, in the case of the slit type pole (B), the manufacturing cost rises because the structure of the slit joint metal is complicated, and the manufacturing cost of the pole is greatly increased. However, due to the improvement of work, even if there is a flange, it does not become a problem in workability of ascending column work, and the flange type pole (A) is better than the slit type pole (B). Demand is higher than that of the slit type pole (B) due to reasons such as low fitting unit price and cost of construction work, ease of construction work, and safety of construction work. Moving to Paul (A).

As shown in FIG. 2, the flange type pole (A) has tension steel wires (4) stretched and embedded between the flanges (2) and (3) at both ends. It is a conventional manufacturing apparatus (Y) for a formula pole (A). The conventional device (Y) has flanges on both sides of the pole formwork (1 ') according to the planned pole length.
(2 ') (3') is attached, the steel wire (4 ') is fixed to one flange (3'), the steel wire (4 ') is inserted into the other flange (2'), and the tension plate ( Fixed to the 5 ') and the tension plate (5')
By pulling the hydraulic jack (6 '), pull the steel wire (4') by a predetermined amount, and pull the steel wire (4 ') between the tension side flange (2') and the tension plate (5 '). Insert a tension retainer (7 ') with a width corresponding to the amount to hold the tension of the steel wire (4'), and in that state concrete (8 ') is poured into the pole formwork (1'), Pole formwork
Rotate (1 ') to centrifuge the injected concrete (8'),
Finally, the steel wire (4 ') was cut along the tension side flange (2').

According to such a conventional method, the work of cutting the steel wire after forming is required and the work is complicated, and the steel wire (4 ') is wasted by the cutting amount and the steel wire. Tension retainer (7 ') with different width according to the amount of tension of (4')
There was a problem with the equipment, such as having to prepare.

[0007]

The problems to be solved by the present invention are as follows.
By setting the length of the steel wire to the length obtained by subtracting the amount of tension in advance, the cutting work after molding as in the past is eliminated and the waste of the steel wire is eliminated, and at the same time the flange type pole with different length is In manufacturing, it is to be able to work with one kind of tension holding tool.

[0008]

In order to achieve the above-mentioned object, as shown in FIG. 1, a steel wire tensioning method for a double-pole flanged pole according to the present invention is as follows. Fit the flanges (2) (3) into the flanges (2) (3)
A steel wire (4) is stretched between them, and one flange (2) is pulled to apply tension to the steel wire (4) and extend the steel wire (4) by a specified amount. In the tensioning method, a cylindrical reinforcing band (9) is provided on the opposing surface side of the tension side flange (2) and slidably inserted into the pole formwork (1),
Set the length of the steel wire (4) as short as the length to be stretched by tension, and keep the reinforcement band (9) inserted in the pole formwork (1) while pulling side flange.
Pull (2) from the pole formwork (1) in the pulling direction, and
It is characterized in that (4) is stretched by a predetermined amount and held so that the length of the steel wire (4) matches the predetermined length of the pole.

As a result, it is possible to eliminate the conventional cutting work after forming and to eliminate the waste of the steel wire, and at the same time, when manufacturing the flange type poles having different lengths, it is possible to perform the work with one kind of tension holding tool. It became so.

In order to carry out the above method, the steel wire tensioning device (X) of the poles with both flanges has a cylindrical pole frame (1) and a pole frame (1) as shown in FIG. Flange guide with a recess (10) installed at one end of the flange into which the flange (2) slidably fits
(11), a fixed side flange (3) fitted to the other end of the pole form (1), and a slidable fit in the recess (10) of the flange guide (11), and a pole type Stretched by applied tension that is stretched between the tension side flange (2) slidably fitted into the inner periphery of the frame (1) and the fixed side flange (3) and the tension side flange (2). Steel wire (4) set as short as necessary and tension device (6) for tensioning the tension side flange (2)
When pulling, pull the flange on the tension side (2) into the flange guide (11).
It is characterized in that it is composed of a tension holding tool (7) fixed to the above, and the above method can be achieved by this.

[0011]

The present invention will be described in detail below with reference to the illustrated embodiments. Fig. 2 is a front view of the three-joint flanged pole (A), which is an intermediate pole with flanges (2) and (3) attached to both ends.
(Aa) is the object of the present invention. As shown in Fig. 3, the flanges (2) and (3) are welded to the flange main bodies (2a) and (3a) surrounding the outer circumferences of the disk-shaped flange main bodies (2a) and (3a) and the columnar body (8a). The steel wire (4) tensioned between the flanges (2) and (3) consists of a cylindrical reinforcing band (9) (9) inside the concrete pillar (8a). It is buried in. The steel wire (4) is usually a PC steel wire having an irregular cross section. The steel wire (4) used in the present invention is preset to be short by an amount to be expanded in proportion to the length of the flange type intermediate pole (Aa).
The reason why the flange type pole (A) is divided into multiple parts is that the daytime pole transportation is restricted to 17 m or less according to the Road Traffic Act, and the flange type intermediate pole (Aa) is 11 m to 1 m.
There are various things such as 6m.

FIG. 1 is a pole with a double flange according to the present invention.
(A) A schematic cross-sectional view of a steel wire tensioning device (X) .A flange guide (11) is attached to one end of a cylindrical pole formwork (1), and one flange body (2a) slides. A cylindrical recess (10) is formed which can be freely fitted.

Then, the flanges (2) and (3) are fitted on both sides of the pole form (1), and the steel wire (4) is stretched between the flanges (2) and (3). Since the length of the steel wire (4) is short at this point, the flange body (2a) on the pulling side is in a state of being fitted into the recess (10). In this state, the tension plate (5) attached to the tension device (6) such as a hydraulic jack is attached to the tension side flange (2) and pulled by a predetermined amount. Usually, it is pulled at a rate of 5 mm per 1 m. When the tensioning is completed, the tension side flange (2) becomes flush with the opening end of the recess (10) of the flange guide (11) and the reinforcing band (9) and the flange guide (11) and the pole type as shown in FIG. It is inserted into the connecting part of the frame (1). Tension plate in such a state
Insert the tension retainer (7) into the outer peripheral recess (12) of (5), hold the tension retainer (7) with the tension plate (5) and the flange guide (11), and hold the steel wire (4). Hold the tension of.

Subsequently, the tensioning device (6) is removed from the tension plate (5), and further the jack support (13) surrounding the tension plate part is removed. Steel wire like this (4)
After making the pole formwork (1) free while maintaining the tension state, place concrete (8) on the pole formwork (1), and then rotate the pole formwork (1) to perform centrifugal molding. Then, the steel wire (4) is embedded in the concrete (8).

At the time of placing the concrete (8), since the tip of the reinforcing band (9) is inserted into the connecting portion between the pole formwork (1) and the flange guide (11), the concrete (8) When placing on the pole formwork (1), the concrete
(8) does not leak out from the reinforcing band (9).

When the concrete centrifugal molding is completed in this manner, the pole frame (1) is removed and cured, and then completed as the intermediate flanged intermediate pole (Aa).

[0017]

[Effect] According to the steel wire tensioning method of the pole with both flanges of the present invention, a cylindrical reinforcing band is provided on the facing surface side of the flange on the pulling side and slidably inserted into the pole frame and the steel wire Set the length as short as the length to be stretched by tension, pull the pull-side flange from the pole form in the pulling direction while keeping the reinforcing band inserted in the pole form, and pull the steel wire. Since the length of the steel wire is stretched by a specified amount and held so that it matches the specified length of the pole, it is possible to give the necessary tension to the steel wire simply by pulling the steel wire according to the specified length of the pole. As a result, unlike the conventional example, there is an advantage that the work of cutting the steel wire after the centrifugal molding of concrete is not required, the waste of the steel wire can be eliminated, and the work can be simplified accordingly. In addition, since the steel wire is shortened in advance by the length required for tensioning, the tension completion position is always a fixed position, and there is no need to prepare multiple tension holding tools as in the past. There is also an advantage.

Further, since the steel wire tensioning device of the poles with both flanges is constructed as described above, the above-mentioned method of the invention can be carried out.

[Brief description of drawings]

FIG. 1 is a sectional view of a steel wire tensioning device for a pole with both flanges for carrying out the method of the present invention.

FIG. 2 is a front view of a three-joint pole using an intermediate pole with both flanges according to the present invention.

FIG. 3 is a sectional view of a connecting portion of an intermediate pole with both flanges according to the present invention.

FIG. 4 is a cross-sectional view of a conventional steel wire tensioning device for a flanged pole.

FIG. 5 is a front view of a conventionally used slit type three-joint pole.

[Explanation of symbols]

 (A)… Three-joint pole with both flanges (B)… Slit-type three-joint pole (1)… Pole formwork (2)… Tension side flange (3)… Fixed side flange (4)… Steel wire (5) )… Tension plate (6)… Tension device (7)… Tension retainer (8)… Pouring concrete (8a)… Concrete pillar (9)… Reinforcement band (10)… Recess (11)… Flange guide ( 12)… Outer peripheral recess (13)… Jack support

Claims (2)

[Claims] 1. A flange is fitted on both sides of a cylindrical pole formwork, a steel wire is stretched between the flanges, and one flange is stretched to give tension to the steel wire to stretch the steel wire by a predetermined amount. In the steel wire tensioning method for both flanged poles, a cylindrical reinforcing band is provided on the opposing surface side of the tension side flange and slidably inserted into the pole formwork, and the length of the steel wire is extended by tension. Keep the reinforcing band inserted in the pole formwork and pull the flange on the tension side in the direction of pulling out from the pole formwork, and stretch the steel wire by the specified amount. A method of tensioning a steel wire for a pole with both flanges, characterized in that the length of the wire is held so as to match the predetermined length of the pole. 2. A cylindrical pole formwork, a flange guide installed at one end of the pole formwork and having a recess into which the flange is slidably fitted, and a fixed side flange fitted to the other end of the pole formwork. And a tension side flange slidably fitted in the recess of the flange guide and slidably fitted to the inner periphery of the pole formwork, and stretched between the fixed side flange and the tension side flange, It consists of a steel wire that is shortened by the amount to be stretched by the applied tension, a tensioning device for tensioning the tension side flange, and a tension retainer that fixes the tension side flange to the flange guide during tensioning. Steel wire tensioning device for poles with double flange.