JPH0477530B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is used in conjunction with a retaining clamp in the work of extending electric wires between steel towers and securing them to the towers, or in the work of replacing insulators. Even if an abnormality occurs in the wire gripping force of the Kamalong during wire tension work, it is possible to prevent accidents that may occur due to this.

[Prior Art and Problems] For electric wires that are extended between steel towers, first, the planned anchoring position is determined on the line, and then the Camalong is installed at an appropriate distance from there. Tie this to the tower with a rope,
Tension the rope. The loosened wire portion is then cut at the predetermined position and a retaining clamp is attached. Tighten the rope further and lock the retaining clamp to the insulator.

The above process assumes that the grip of the electric wire by the Camalong is maintained reliably from beginning to end. As shown in FIG. 4, the Kamalong has a wedge K inserted between two split ring-shaped main bodies M and an electric wire E, which also have a split ring shape and an external taper. The wedge is hammered in sufficiently with a hammer when installing, but even then, while the rope is further tightened after the wire tension has been borne, the wedge may loosen due to the slight force acting on it, causing the Kamarong to slip all at once. . In such a case, a phenomenon known as a ``rampage'' of electric wires will occur, knocking away people working at heights near the tower, or destroying the Camalong and causing the electric wires to fall. In this way, driving wedges has a major impact on the success or failure of the entire construction project, and is dangerous work on high-altitude power lines, so it can only be left to experienced and skilled workers. . Selection of suitable personnel has become a major difficulty.

[Means for solving the problem] Even if slippage occurs in the Cama Long, the restraining clamp can be locked to the steel tower with a slight time lag. For this purpose, an auxiliary clamp integrated with the detention clamp is provided, and this is secured to the tower using another wire. In the present invention, this auxiliary clamp is called a backup clamp. This prevents the occurrence of "unruliness" in the wire and eliminates the need to select a specially skilled person to drive the wedge.

[Example] The drawings will be explained. The present invention is composed of a main body 1 and a pull fitting 2. The main body 1 consists of an annular portion 1a and a pin 1b, and the annular portion is provided with a cut 1c into which an electric wire E can be inserted from the side. Annular part 1a
is inserted into the small diameter portion Ha of the retaining clamp H, and is locked at the inclined large diameter portion Hb. Pin 1b is annular part 1a
It protrudes radially symmetrically from the The pull fitting 2 is U-shaped, and is secured to the pin 1b through holes at both leg ends and fastened with nuts 3.

Next, the wire tensioning work according to the present invention will be explained with reference to FIG. The electric wire E is temporarily fixed to the steel tower with a rope R via a kamalong C and a pulley P. Attach a retaining lamp H to the free end of the electric wire in front of the Camalong. A back-up clamp B is attached to the retaining clamp H,
It is attached to the steel tower via a wire W. Clamp B can be attached by inserting it into the wire through cut C and then shifting its position along the wire. In this state, the rope R is tightened, and the retaining clamp H is connected to the insulator G attached to the steel tower to complete the final stop. After this, the Kamarong and back up clamps will be removed.

In the above-mentioned process, slippage of the kamalong tends to occur between temporary fixing and final fixing, that is, during the tensioning process. However, in the present invention, immediately after the occurrence of slippage, the wire W becomes taut to prevent the slippage. The length of the wire connecting the backup clamp and the steel tower should be set to approximately meet the above conditions.

[Effect] Electric wires are prevented from going wild and the safety of workers working at heights is ensured. Driving a wedge is a task that anyone can do.

In the past, it was difficult to pull up the suspended retaining clamp to the vicinity of the insulator for retaining it. This is because some restraining clamps can weigh up to 30 kg for large-diameter wires. However, in the present invention, this difficulty is eliminated because the retaining clamp is originally retained near the insulator. Although this is a secondary effect, it is also a major effect.

[Brief explanation of the drawing]

Fig. 1 is a front view of the present invention, Fig. 2 is a cross-sectional view of the same along arrows AA, Fig. 3 is a front view of the retaining clamp, Fig. 4 is a perspective view of the Camalong, and Fig. 5 is an explanatory diagram of the tensioning work. be. 1...Body, 1a...Annular part, 1b...Pin,
1c...cut, 2...handle fitting, B...backup clamp, C...kamarong, M...main body,
K...wedge, W...wire, P...pulley, R...
...rope, H...retention clamp.

Claims (1)

[Claims] 1. A main body consisting of an annular part that has a cut through which an electric wire can be inserted from the side and is inserted and locked into a retaining clamp, a pin that projects radially symmetrically into the annular part, and a main body that is locked at both leg ends to the main body pin. A back-up clamp for tension line work, consisting of a U-shaped handle fitting, the main body of which is attached to a restraining clamp, and the pull fitting is secured to a tension insulator of a steel tower.