JPH0463608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for wedge-pressing a wedge-shaped retaining clamp of a conductor tensioning device mainly used for installing large-span overhead power transmission lines.

[Conventional technology]

Examples of wedge-shaped retaining clamps used in this type of wedge press-fitting method include those shown in FIGS. 9 to 11, for example. This wedge-shaped retaining clamp 1 has a clamp body 2 that can be opened and closed by a hinge 3, and a pair of support pieces 9.
Attach the length adjustment plate 33 with bolts 34 and nuts 36 via a and 9b, and attach one support piece 9
The support piece a is longer in length than the other support piece 9b, and its tip is attached to the length adjustment plate 33 with a bolt 37. A tapered hole 4 is provided through the clamp body 2,
A pair of tapered wedge pieces 6a and 6b sandwiching the conductor 5 are inserted into the tapered hole 4, and the jumper side of the conductor 5 is guided by an arc-shaped guide 10 fixed to the tapered wedge piece 6b. I have to. Also, the first
Wedge-shaped retaining clamp 11 shown in FIGS. 2 and 13
A support shaft 13 is attached to the upper part of the insulator side of both side walls of the clamp body 12 having a U-shaped cross section, and a pair of triangular pieces 16 are attached to the support shaft 13, the bottom face 15 of which faces the conductor guide groove 14 of the clamp body 12. Mounting pieces 17a, 17
b, and a U-shaped metal fitting 18 is attached along the bottom outer peripheral surface of the clamp body 12. And conductor guide groove 1
4, and clamp the jumper side with the clamp fitting 1.
At 9, a tapered wedge 41 is inserted between the conductor 5 attached to the arcuate guide 20 and the bottom surface 15 of the triangular piece 16.

To tension the conductor 5 using a conductor tensioning device equipped with a wedge-shaped retention clamp as described above, as shown in FIG. , this come-along 22 and the wedge-shaped retaining clamp of the conductor tensioning device 24 attached to the steel tower arm 23, for example, the body piece 2a of the clamp body 2 of the wedge-shaped retaining clamp 1 shown in FIGS. 9 to 11.
Ring attachment part 7 (Fig. 9) protruding from the side tip of
are connected in advance via a link 26, a semi-metal wheel 27, a tension ring 28, etc. In this case, the main body piece 2a of the clamp main body 2 is attached to the length adjusting plate 33 with the bolt 37 via the supporting piece 9a, but the supporting piece 9b attached to the main body piece 2b and the length adjusting plate 33 are Since the mounting bolt 34 and the bolt 8 that fastens the main body piece 2b and the main body piece 2a have been removed, the main body piece 2b is attached to the main body piece 2a so that it can be opened and closed freely, and the clamp main body 2 has a taper. The wedge pieces 6a, 6b are not inserted, and the hydraulic cylinder 3 is not inserted into the pair of support pieces 9a, 9b.
2 is not installed. On the other hand, the free end of the wire 30 wound around the semi-metal wheel 27 is attached to a winch (not shown) via a pulley 31 attached to the steel tower arm 23 and the like. In FIG. 1, numeral 38 is an insulator chain of the conductor tension device 24.

Now, with the conductor 5 fixed to the steel tower side in front of the come-along 22, use a winch to pull the wire 3.
As the wire 0 is wound, the semi-metal wheel 27 is shortened, so that the conductor 5 beyond the come-along 22 and the conductor tensioning device 24 are stretched. When the conductor 5 is stretched with a predetermined tension, a predetermined position of the conductor 5 in a tension-free state between the come-along 22 and the metal wheel 21 is held between the tapered wedge pieces 6a and 6b, and the tapered wedge pieces 6a and 6b are stretched. 6
b together with the conductor into the tapered hole 4 of the clamp body 2, connect the body pieces 2a and 2b with the bolt 8, and then connect the support piece 9b and the length adjustment plate 33 with the bolt 34.
and a nut 36 (Fig. 2). and,
A hydraulic cylinder 32 is attached to a pair of support pieces 9a and 9b, and a tool 35 is interposed between the plunger of this hydraulic cylinder 32 and a wedge 6 made up of a pair of tapered wedge pieces 6a and 6b to operate the hydraulic cylinder 32. Press the wedge 6 into the tapered hole 4 of the clamp body 2 (Fig. 3). When the wedge 6 is press-fitted, the hydraulic cylinder 3
2. Remove the tool 35 and piping, and unwind the wire 30 with a winch (Fig. 7). By unwinding the wire, the semi-metal wheel 27 is expanded and relaxed, and the conductor 5 between the come-along 22 and the clamp body 2 is also stretched. Afterwards Come Along 22, Link 26,
The semi-metal wheel 27, tension ring 28, wire 30, pulley 31, metal wheel 21, etc. are removed, and the relaxation of the conductor is adjusted to obtain a normal tensioned state (FIG. 8).

During the conductor tensioning, the conductor tensile load acts on the clamp body 2 through the wedge 6, and when the tensile load becomes larger than the wedge movement start load, the wedge 6 and the conductor 5 move in the direction of the tensile load, so the tensile load decreases. When the tensile load becomes less than the wedge movement load, the movement is stopped and held by the clamp body 2.

[Problem to be solved by the invention]

If a tensile load exceeding the wedge movement start load is applied to the conductor, the wedge and the conductor move in the direction of the load each time, so the sag of the conductor increases. As a result, the conductor approaches the conductor or structure below, and the amplitude of the conductor increases due to wind pressure, causing problems such as insufficient insulation distance.

Therefore, the wedge pressure input was increased to increase the wedge movement start load. However, in recent years, as overhead power transmission lines have become larger, and attempts have been made to increase the wedge pressure input accordingly, hydraulic cylinder devices have become even higher in pressure and larger, increasing manufacturing costs. The mounting brackets etc. to be installed have also become larger,
Since the weight of both the hydraulic cylinder device and the mounting fittings increases, the work of attaching and detaching the hydraulic cylinder to the wedge-shaped retaining clamp at a high place becomes even more dangerous and difficult.

The present invention was made in view of the above-mentioned circumstances, and
It is an object of the present invention to provide a wedge press-fitting method for a wedge-shaped retaining clamp that can increase the wedge movement starting load without increasing the pressure or increasing the size of the wedge press-fitting device.

[Means to solve the problem]

In order to achieve this objective, the wedge press-fitting method of the present invention provides a method for connecting a wedge-shaped retaining clamp of a conductor tensioning device attached to a support structure and a come-along attached to a conductor on a wire wheel. Wring out the stretched wire and tension the conductor beyond the come-along and the conductor tensioning device at a specified tension, then use a wedge to attach the conductor between the come-along and the metal wheel to the clamp body of the wedge-shaped retaining clamp. Installation: A wedge press-fitting device is provided on the wedge-shaped retaining clamp, and the wedge is press-fitted into the clamp body by this wedge press-fitting device.When the press-fitting is completed, the wire is loosened and the conductor between the come-along and the clamp body is also stretched. Then, the wedge is press-fitted into the clamp body again by the wedge press-fitting device to increase the load at which the wedge starts moving.

A fluid pressure cylinder device may be used as the wedge press-fitting device.

[Effect]

By squeezing the wire passed between the wedge-shaped retaining clamp of the conductor tensioning device attached to the support structure and the come-along attached to the conductor on the wire wheel, the come-along and the wedge-shaped retaining clamp will approach each other. The conductor beyond the come-along and the conductor tensioning device are tensioned. When the conductor is stretched to a predetermined tension, a predetermined part of the conductor between the come-along and the metal wheel is attached to the clamp body of the wedge-shaped retaining clamp via a wedge, and a wedge press-fitting device is attached to the wedge-shaped retaining clamp side.
This wedge press-fitting device press-fits the wedge into the clamp body. Then, while the wedge press-fitting device remains attached to the wedge-shaped retaining clamp, the wire between the come-along and the clamp body is loosened. This tensions the conductor between the come-along and the clamp body, and the tensile load of the conductor is transmitted to the clamp body via the wedge.
Thereafter, the wedge is again press-fitted into the clamp body by the wedge press-fitting device.

In other words, in the first wedge press-fit, no conductor tensile load is acting on the clamp body, so the press-in force P _O
When _the wedge is _{press - fitted} into the clamp body _in Because there is pressure force
When the wedge is press-fitted into the clamp body with P _O , the wedge movement start load F _N is F _N = (P _O + F _O ) k _N.

That is, the difference in the wedge movement start load between the second and first wedge movement is F _N −F _P =(P _O +F _O )k _N −P _O ·k _p . Here, the constant k _N and the constant k _p are about 0.8 from past test results and are almost equal, so if the first and second pressing forces P _O are the same, the second wedge movement starting load F _N is It is approximately P _O ·k _p larger than the first wedge movement starting load N _P.

〔Example〕

Embodiments of the present invention will be described based on the drawings. FIG. 1 shows that a come-along 22 is attached to the conductor 5 on the wire wheel 21, and a conductor tensioning device 24 is attached to the tower arm 23, and the wedge-shaped retaining clamp 1 (see FIGS. 9 to 11) ) link the ring attachment part 7 and the come-along 22 with a link 26, a semi-metal wheel 27,
The wire 30 is connected via a tension ring 28 etc., and the free end side of the wire 30 wound around the semi-metal wheel 27 is attached to a winch (not shown) via a pulley 31 etc. attached to the tower arm 23. show.

Now, if the wire 30 is wound up with a winch while the conductor 5 is fixed to the steel tower side in front of the come-along 22, the conductor 5 and the conductor tension device 24 beyond the come-along 22 will be shortened by the semi-metal wheel 27. (Fig. 2). When the conductor 5 is stretched with a predetermined tension, the tapered wedge pieces 6a, 6b
Then, a predetermined portion of the conductor in a tension-free state between the come-along 22 and the metal wheel 21 is held, and the tapered wedge pieces 6a and 6b are inserted into the tapered hole 4 of the clamp body 2 together with the conductor. Next, a wedge press fitting device, in this embodiment a hydraulic cylinder 32 which is one of the fluid pressure cylinder devices, is attached to the pair of support pieces 9a, 9b, and the plunger of this hydraulic cylinder 32 and the pair of tapered wedge pieces 6a, 6b are attached. A tool 35 is interposed between the clamp body 2 and the hydraulic cylinder 32 is operated to press-fit the wedge 6 into the clamp body 2 (FIG. 3). The above wedge press-fitting method is as described in detail in the prior art section.

In addition, in the wedge press-fitting process, the conductor 5 inserted into the clamp body 2 is in a tension-free state, so
No conductor tensile load is added to the wedge movement start load obtained by press-fitting the wedge.

In this embodiment, when the first wedge press-fitting process is completed (FIG. 3), the wire 30 is unwound with the hydraulic cylinder 32 attached. As a result, the semi-metal wheel 27 is expanded and relaxed, and the conductor between the come-along 22 and the clamp body 2 is also stretched (FIG. 4).
Thereafter, the wedge 6 is again press-fitted into the clamp body 2 by the hydraulic cylinder 32. Therefore, in the second wedge press-fitting process, the wedge 6 is connected to the conductor tensile load and the hydraulic cylinder 3.
It is press-fitted into the clamp body 2 under the pressure force of 2, and the wedge movement starting load becomes much larger than in the first case.

When the wedge press-fitting operation is completed again using the hydraulic cylinder 32, the come-along 22, the link 26, the semi-metal wheel 27, the tension ring 28, the wire 30, and the pulley 31 are removed.
(Fig. 5), and further remove the metal wheel 21, wedge press-in device 32, piping, etc. (Fig. 6).

In addition, when the wedge-shaped retaining clamp is shown in FIGS. 12 and 13, as shown in FIG. After that, the predetermined position of the conductor between the come-along 22 and the metal wheel is set with a wedge 4.
When attached to the clamp body 12 in step 1, one end side of the wedge press-fitting device 42 is attached to the U-shaped metal fitting 18 of the clamp body 12, and its plunger (not shown) is attached to the wedge 41.
The wedge press-fit device 42 is actuated to press-fit the wedge 41 into the clamp body 12. In this first wedge press-fitting step, no conductor tensile load is applied to the clamp body 12. After the first press-fitting process is completed,
The wire 30 is loosened and the conductor between the come-along 22 and the clamp body 12 is stretched. (FIG. 15, but the wire 30 and the come-along 22 are removed in the figure). Here, the wedge 41 is again press-fitted into the clamp body 12 by the wedge press-fitting device 42. In this wedge press-fitting process, a conductor tensile load is acting on the clamp body 12, so the wedge movement starting load F _N is compared to the first wedge movement starting load F _P , even though the pressing force of the wedge press-fitting device is the same. However, it grows exponentially.

〔Effect of the invention〕

As explained above, according to the wedge press-fitting method of the wedge-shaped retaining clamp according to the present invention, the wedge movement starting load is dramatically larger than the conventional wedge press-fitting method even if the press force of the wedge press-fitting device is the same. Therefore, it is possible to reduce the weight and size of the wedge press-fit device and mounting brackets, etc.
Manufacturing costs can be reduced, and work for installing and removing devices, mounting fittings, etc. of this type, which requires work at heights, can be done relatively easily and safely.

[Brief explanation of the drawing]

1 to 6 are explanatory diagrams of a wedge press-fitting method for a wedge-shaped retaining clamp according to the present invention; FIGS. 1 to 3;
8 and 8 are explanatory diagrams of the conventional wedge press-fitting method, and FIG.
10 is a side view of the same, FIG. 11 is a sectional view taken along line A-A in FIG. 10, and FIG. 12 is a wedge-shaped retaining clamp used in the present invention. 13 is a sectional view taken along the line B-B in FIG. 12, FIG. 14 is an explanatory diagram of the first wedge press-fitting process using the same wedge-shaped retention clamp, and FIG. 15 is a side view of the wedge-shaped retention clamp. It is an explanatory diagram of the same second wedge press-fitting process. 1, 11... Wedge-shaped retaining clamp, 2, 12...
Clamp body, 5... Conductor, 6, 41... Wedge, 2
DESCRIPTION OF SYMBOLS 1... Metal wheel, 22... Come-along, 23... Support structure, 24... Conductor tension device, 30... Wire, 32, 42... Wedge press-fit device.

Claims (1)

[Claims] 1. Between the wedge-shaped retaining clamps 1, 11 of the conductor tensioning device 24 attached to the support structure 23 and the come-along 22 attached to the conductor 5 on the wire wheel 21, The conductor beyond the come-along 22 and the conductor tension device 24 are stretched with a predetermined tension by squeezing the wire 30, and then the predetermined position of the conductor between the come-along 22 and the metal wheel 21 is wedged with the wedges 6 and 41. The wedge-shaped retaining clamps 1, 11 are attached to the clamp bodies 2, 12 of the mold retaining clamps 1, 11, and wedge press-fitting devices 32, 42 are provided on the wedge-shaped retaining clamps 1, 11. , 12, and when the press-fitting is completed, the wire 30 is loosened, the conductor 5 is also stretched between the come-along 22 and the clamp bodies 2, 12, and then the clamp body 2 is again tightened by the wedge press-fitting devices 32, 42. , 12 to increase the wedge movement starting load. 2. The wedge press-fitting method for a wedge-shaped retaining clamp according to claim 1, wherein the wedge press-fit devices 32, 42 are fluid pressure cylinder devices.