JPH02214409A - Jamper clamper for overhead earth wire incorporating optical fiber cable - Google Patents

Abstract

PURPOSE:To wire a jamper wire such that transmission loss of an optical fiber incorporating the jamper wire does not increase nor the function thereof degrades by changing the height of vertical face section and the lateral direction. CONSTITUTION:Bolt holes 11, 11 are made at the upper section of the vertical face section 6 of a bracket 5, and many bolt holes 12, 12 are also made with same pitch through a supporting plate 7. A row of many bolt holes 13 are made laterally, with proper interval, through the upper section of the supporting plate 7. In a clamp metal fixing metal 8, a threaded shaft 9 is projected upward from the center of the fixing seat 15. In a jamper wire clamp metal 10, a stopper metal 18 is fixed by a shaft 17 rotatably in vertical direction and it is tightened by means of a bolt 20 in a notched groove 19 and a nut 21. By such arrangement, height, lateral direction and orientation can be changed, excessive stress is not produced in the jamper wire, transmission loss of optical fiber cable does not increase and malfunction can be prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a jumper clamp that is attached to the top of an overhead ground wire tension clamp mounting arm to clamp a jumper wire of an overhead ground wire with a built-in optical fiber cable. It is something.

[Conventional technology]

Jumper clamps of this type are shown in Figures 11 and 12, for example.
As shown by reference numeral 51 in the figure, it consists of a clamp body 53 that is attached to the top surface of the steel tower arm 52, a presser 54, and two sets of bolts 55 and nuts 56. In the formed wire receiver, a jumper wire 59 between overhead ground wire tension clamps 57 and 58 attached to both sides of the tower arm 52 was clamped with a fitting bolt 55 in the groove 60.

The jumper clamp 61 shown in FIGS. 13 and 14 is
A clamp body 62 attached to the top surface of the steel tower arm 52, and a set of upper and lower holding metal fittings 63, 64.6 superimposed on the top surface.
3', 64', and two sets of bolts 65 and nuts 66, and a jumper wire 67.68 leading from the ground wire tension clamp 57.58 to a joint box (not shown) in the middle of the steel tower.
was held between holding metal fittings 63', 64', and 63 and 64, and clamped with two sets of bolts 65 and nuts 66.

[Problem to be solved by the invention]

Jumper wires for overhead ground wires with built-in optical fiber cables must be wired with gentle curves to avoid increasing transmission loss or impairing the functionality of the fiber cable. However, due to adjustment of the slackness of the overhead ground wire, the jumper spacing L
(Fig. 12), the axes of both ground wire tension clamps on both sides of the tower arm are mismatched, and the horizontal angle and catenary angle of both ground wire tension clamps are different. In this case, small curved parts are easily formed in the jumper wire, for example, as shown in Fig. 11, small curved parts are formed near the jumper clamp 51, resulting in increased transmission loss and functional deterioration of the fiber cable. .

In addition, in the case shown in Figs. 13 and 14, the jumper wires 67 and 68 need to be largely changed in direction from the top of the tower body to the intermediate joint box, so the jumper wires 67 and 68 are The wire holders of clamps 57 and 58 may be removed from the middle of the groove to the outside and bent, and in such cases, the vibration of the overhead ground wire may damage the wire holder and the jumper wire at the edge of the side wall of the groove. There is. Furthermore, if you want to change the direction of the jumper wire 6768 at the jumper clamp location, this jumper clamp 61 can only adjust the orientation in three steps at most, so it is difficult to uniformly wire both jumper wires in a preferred manner, and one Even if the wiring is relatively preferable, the other wiring may be strained, and as a result, the transmission loss of the optical fiber cable may increase or the function may be impaired.

The present invention has been made in view of the above points, and an object of the present invention is to provide a jumper clamp that allows jumper wires to be wired without increasing transmission loss or deteriorating the functionality of optical fiber cables with built-in jumper wires.

[Means to solve the problem]

In order to achieve this purpose, the jumper clamp for an overhead ground wire with a built-in optical fiber cable according to the present invention includes a bracket provided at the top of the arm to which the overhead ground wire tension clamp is attached, and a vertical surface of the bracket. A support plate that can be mounted at different height positions, a clamp fitting fixture that can be mounted on the top of the support plate at different lateral positions and has an upward screw shaft protruding, and a clamp fitting that is screwed onto the screw shaft. It consists of a jumper wire clamp fitting with a holding fitting attached to the clamp body.

A plurality of clamp metal fittings each having a jumper wire clamp fitting screwed thereto may be attached to the support plate, and in that case, the lengths of the screw shafts of the clamp metal fittings can be made different.

[For production]

The height of the jumper wire clamp fitting of a jumper clamp can be changed by changing the mounting position of the support plate with respect to the bracket provided on the tower arm, and the lateral position can be changed by changing the mounting position of the clamp metal fitting with respect to the support plate. Furthermore, the direction of the clamp fitting fitting can be changed by rotating it around the screw shaft of the clamp fitting fitting.

Therefore, even if the jumper spacing of the ground wire tension clamps on both sides of the tower arm changes, the axes of the two ground wire tension clamps do not match, or the horizontal angle and catenary angle differ, the jumper wires will not hold the ground wire tension. The wire holder of the clamp can be wired in a gentle curve without being bent at the side wall edge of the groove or creating a small curved part. Also, for multiple jumper wires, the jumper wire clamp fitting can be screwed together. By attaching the same number of clamp fittings as the number of jumper wires to the support plate, it is possible to change the height position, lateral position, and direction of each jumper wire clamp fitting to obtain a wiring condition suitable for each jumper wire. Furthermore, when jumper wires need to be installed in an intersection, for example when leading the jumper wires to a joint box installed in the middle of a steel tower, the length of the screw shaft can be varied and the height can be freely changed to ensure proper crossing. It can be arranged as follows.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

The jumper clamp l shown in Figs. 1 to 3 includes an L-shaped bracket 5 that is attached to the upper surface of a steel tower arm 2 with a plurality of bolts 3 and nuts 4, and an L-shaped bracket 5 that is attached to the vertical surface 6 of the bracket 5 with bolts 30 and nuts 31. a T-shaped support plate 7;
It consists of a clamp fitting fitting 8 which is attached to the upper part of the support plate 7 with a bolt 33 and a nut 34, and a jumper wire clamping fitting 10 which is screwed onto an upward threaded shaft 9 of the clamp fitting fitting 8.

There are bolt holes 1 on the left and right in the upper part of the vertical surface part 6 of the bracket 5.
1.11 is drilled, and the support plate 7 is provided with the bolt hole 1.
A large number of bolt holes 12, 12 with the same pitch as 1.11 are bored in two vertical rows at appropriate intervals, and on the upper part of the support plate 7, a large number of bolt holes 13 are formed in one horizontal row at appropriate intervals. It has been drilled. The clamp metal fixture 8 has an upwardly directed screw shaft 9 protruding into the center of a mounting seat 15 in which bolt holes 14.14 are bored with a pitch that is an integral multiple of the pitch of the bolt holes 13.13, twice the pitch in the embodiment. Set up In the jumper wire clamp fitting 10, a holding fitting 18 is attached to an example of the upper part of the clamp body 16 with a support shaft 17 so as to be vertically rotatable, and a bolt hole 20 is provided in a notch groove 19 formed on the other side of the holding fitting 18 on the other side. is attached with a support shaft 25 so that it can be inserted and removed, and this bolt 2
0 and screw the nut 21 on. In addition, a screw hole 22 for screwing into the screw shaft 9 is formed in the center of the lower part of the clamp body 16, and a wire holder for a jumper wire is formed in the center of the opposing surface of the clamp body 16 and the presser fitting 18 in parallel with the support shaft 17.28. groove 23.2
4 is formed.

The jumper clamp I shown in FIGS. 4 to 6 consists of two clamp fitting fittings with different lengths of threaded shafts 9.9' for screwing jumper wire clamp fittings 10.10' onto both sides of a support plate 7. 8, 8' with bolt 33 and nut 34, respectively.
It is installed with. The other configurations are the same as those shown in FIGS. 1 to 3.

The clamp fitting fittings 8.8' may be attached to one side of the support plate 7, or the screw shafts 9.9' may have the same length as shown in FIGS. 7 and 8. The jumper wire 27 of the ground wire tension clamp 26 and 26' with equal horizontal and catenary angles is stretched on both sides of the tip of the tower arm 2 and is clamped by the jumper clamp 1 attached to the top surface of the tip of the tower arm 2. Indicates the state in which That is, in order to clamp the middle of the jumper wire 27, which curves upward with a large radius of curvature, with the jumper wire clamping metal fitting 10, a jumper wire clamping metal fitting 100 is installed at the middle position of the jumper wire 27, which is approximately straight when viewed from the plane. The clamp fitting fitting 8 is attached to the support plate 7 so that the grooves 23 and 24 are located.
At the same time, the jumper wire 27 is clamped by the clamp fitting 10 by adjusting the direction of the grooves 23, 24 and the height of the support plate 7 of the clamp fitting lOO wire holder with the presser fitting 18 opened.

Figures 9 and 10 show both ground wire tension clamps 26.26
Connect both jumper wires 27 and 27' to the joint box (not shown) in the middle of the tower using two clamp fittings i.
Shows the state clamped at o and to'. In this case, in order to cross the jumper wires 27° and 27', the screw shafts 9 and 9'
Using clamp metal fittings 8.8' with different lengths,
The height and lateral positions of both jumper wire clamp fittings 10 and 10' and the wire receivers are adjusted to suit the wiring conditions by adjusting the directions of the grooves 23, 24, 23' and 24', respectively.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the following effects.

■ Since the height, lateral position, and orientation of the jumper wire clamp fittings of the jumper clamp can be changed arbitrarily, mismatches in the axes of both ground wire tension clamps, differences in horizontal angle, and catenary angle may occur. However, the jumper wires can be placed in a preferable wiring state. Therefore, undue bending stress is not generated in the jumper wire, and an increase in transmission loss and functional deterioration of the optical fiber cable in the jumper wire can be prevented.

■ A plurality of mutually independent clamp fittings whose height position, lateral position and direction can be arbitrarily changed are attached to one jumper clamp, so it is possible to make the jumper wires cross each other or not cross each other. It can be in a wiring state. Therefore, it is suitable, for example, for a jumper clamp that crosses jumper wires and leads to a PA India box located in the middle of a steel tower.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a plan view of the jumper wire clamp fitting in FIG. 1, and FIG. 5 is a side view of the embodiment, FIG. 6 is a plan view of the jumper wire clamp fitting shown in FIG. 4, and FIG. FIG. 8 is a plan view showing an example of the state in which the jumper wires are clamped, FIG. 9 is a plan view showing an example of the state in which the jumper wires are clamped by the jumper clamps shown in FIGS. 4 and 5, and FIG. 11 is a plan view showing an example of a state in which jumper wires are clamped by a conventional product; FIG. 12 is a side view of the same, and FIG.
FIG. 3 is a plan view showing an example of a state in which jumper wires are clamped by another conventional product, and FIG. 12 is a side view of the same. 5... Bracket, 6. Support plate, 8, 8', Tool, 9.9'... Screw shaft, Yampar wire clamp fitting, 1 Pump body, 18.18', Vertical surface part, 7... Clamp fitting installation 0 .10'...Ji, 16'...Cracker presser fitting.

Claims (1)

[Claims] 1. A bracket (5) provided at the top of the arm to which the overhead ground wire tension clamp is attached, and a support plate (5) that can be attached to the vertical surface (6) of this bracket at different heights. 7) and can be attached to the upper part of this support plate at different lateral positions, and the screw shafts (9), (9'
) protruding clamp fitting fittings (8), (8');
A clamp body (
Jumper wire clamp fittings (10), (10') with holding fittings (18), (18') attached to 16), (16')
Jumper clamp for overhead ground wire with built-in optical fiber cable. 2. The built-in optical fiber cable according to claim 1, wherein a plurality of clamp fitting fittings (8), (8') screwed together with jumper wire clamp fittings (10), (10') are attached to the support plate (7). Jumper clamp for overhead ground wire. 3. Screw shaft (9) of clamp fitting fitting (8), (8')
) and (9') have different lengths, the optical fiber cable built-in type jumper clamp for an overhead ground wire according to claim 2.