JP2008113527A - Electric wire replacement method and construction yoke used in the replacement method - Google Patents

Abstract

An object of the present invention is to provide an electric wire refurbishing method in which a main wire is raised and supported at the center of a front end edge of a continuous yoke, and a load that is not biased to the insulating wire is not applied when the electric wire is repainted by a hanging metal method.
A construction yoke a, b is attached to the insulator linkage yoke 4 so that a part of the insulator linkage yoke 4 protrudes from both sides of the insulator linkage yoke 4 and the central portion of the front end edge, and a suspension wheel is attached to the electric wire. , B are attached to the semi-metal wheel 7, the electric wire is pulled and supported by one end of the wire 9 of the semi-gold wheel 7, the electric wire is peeled away from the continuous yoke 4, and the front end of one of the separated electric wires is connected to the construction yoke a and b are supported by the protrusions 1c at the front end edges of the wires, the support of the wires by the wires 9 is released, the other separated wires are hung under one of the wires, and the front end edges of the construction yokes a and b are One electric wire supported by each projecting portion 1c is used as a parent wire for the lifting method, the other electric wire is pulled to remove the electric wire, and a new wire connected to the rear end of the other electric wire is extended.
[Selection] Figure 9

Description

  The present invention relates to a method for replacing an electric wire in a hanging wire method using a number of suspension wheels, which is adopted when replacing an existing two-wire electric wire stretched between two steel towers with a new wire. The present invention relates to a construction yoke used in the re-covering method.

  A number of electric wires are stretched by each steel tower, and as shown in FIG. 11, these electric wires C are stretched by the armature e of each steel tower E via the insulator string 6 and the insulator string yoke 4. ing. When performing such re-covering work of the electric wires C, if a scaffold cannot be constructed under these electric wires C, a hanging method is adopted. In this suspension method, a number of suspension wheels having gold wheels at both ends of a rope are suspended from branch lines such as electric wires C and wires stretched between steel towers E at intervals. This is a construction method in which the electric wire C is replaced and extended through the electric wire C or the like.

  As such, in the insulator series yoke, between the two existing wires, two semi-gold wheels were suspended to temporarily fix the existing wires, and then the existing wires were attached. Install a vernier fitting at the location, attach the existing wire to this vernier fitting, move the semi-gold wheel to this vernier fitting, and then peel off one of the wires and pull it to the center of the continuous yoke, There is a method of replacing the electric wire by using a hanging metal method.

As another example, a temporary array yoke is rotatably provided in front of the insulator continuous yoke, the two wire end support portions are moved from the insulator continuous yoke to the temporary array yoke, and the temporary array yoke is rotated. In this state, the suspension portion of the lower wire end is removed from the temporary arrangement yoke, and the upper wire is used as a parent wire, and a number of suspension wheels are arranged with a space between these wires. There is a method of drawing a lower wire while supporting the lower wire, and simultaneously extending a new wire previously connected to the other end of the lower wire.
JP 2005-295682 A

  However, in the former construction method, the temporary fixing of the existing electric wires has to be changed many times, which is troublesome. In addition, there is a risk that the two sets of semi-metal wheels come into close contact with each other and may be damaged. In the latter method, when the temporary arrangement yoke is rotated vertically based on the insulator continuous yoke and the lower electric wire is pulled, the upper electric wire is used as a parent wire, so that the upper electric wire is tensioned. Are pulled forward, which causes each insulator of the insulator string to fall forward. At that time, adjacent insulators may collide and be damaged. Therefore, it is conceivable to take measures such as pulling the upper part of the vertically arranged temporary yoke with the wire from the arm of the opposite steel tower that is not the side that pulls the electric wire. It takes time, and when the temporary arrangement yoke is rotated, the wire must be removed and rotated. Moreover, the operation | work which attaches or removes such a wire becomes very complicated.

  Therefore, in the present invention, when performing the work of replacing the two wires by the above-described suspension metal construction method, the wire serving as a parent wire is supported at the center of the front end edge of the continuous yoke, and twisted into an insulator, etc. It is an object of the present invention to provide an electric wire renewal method that can be safely repositioned without applying an uneven load, and a construction yoke used in the renewal method.

  According to the first aspect of the present invention, in the re-construction method using a number of suspension wheels, which is performed when re-wiring an electric wire stretched between steel towers, two strip insulators are attached to the rear edge, and 2 are attached to the front edge. Install the construction yoke on the rectangular insulator series yoke to which the existing wires of the strip are installed, by projecting a part from both sides of the insulator series yoke and the central part of the front edge, respectively. At the end of the linear body wound around each semi-metal wheel, the above-mentioned two items are attached to the electric wire of the wire. Pull each wire to temporarily support it.

  The two temporarily supported wires are separated from the insulator series yoke, and the front end of the one separated wire is attached to and supported by the protruding portion of the front end edge of the construction yoke. The temporary support by each linear body is released respectively, the other separated electric wire is suspended along the lower side of the one electric wire, and the one electric wire supported by the protruding portion of the front end edge of the construction yoke is the above-described suspension method Pull the other electric wire through the multiple suspension wheels as a parent wire to remove the electric wire, and extend a new wire connected to the rear end of the other electric wire, and then wrap it around each semi-metal wheel The new wire and the one electric wire are temporarily supported by the respective linear members.

  Remove the front end of the one wire from the projecting portion of the front end edge of each construction yoke, attach the front end of the new wire to the projecting portion of the front end edge of the construction yoke, and then The temporary support of the one electric wire and the new wire is released, respectively, the one electric wire is suspended along the lower side of the new wire, and the one electric wire is used as the new parent wire, and the one electric wire is used as the plurality of suspension hooks. Pull the wire through the car to remove the electric wire and extend the new wire connected to the rear end of the electric wire, and then temporarily support the parent wire and the new wire by the wire bodies wound around the semi-golden wheels, respectively. The front end of the new line is attached to and supported by the continuous yoke, the front end of the new line as the parent line is removed from the protruding portion of the front end edge of the construction yoke, and the front end of the new line is further removed and connected. Attached to and supported by the yoke, and The linear body wound around the semi-gold car by the temporary support of each of the new line was respectively of release for wire replacement method.

  According to a second aspect of the present invention, there is provided the electric wire repositioning method according to the first aspect, wherein two substantially L-shaped plate bodies are provided to face each other, and each of the upper portions of the substantially L-shaped upper portions of the two plate bodies is provided. A horizontally-long holding metal fitting is attached between the front end edges to connect and fix the opposing front end edges, and a construction yoke is provided in which the substantially L-shaped bent right front end protruding portions are opened.

  In each of the above-described wire re-stripping methods, each of the ends of the existing rectangular insulator series yoke to which two strips of insulator series are attached is sandwiched by the projecting protrusions of the open end of the construction yoke and the clasps are attached. The edge is protruded from one side of the insulator continuous yoke, and each tip protrusion of the construction yoke is protruded from the front edge of the insulator continuous yoke, and the insulator yoke is covered with the construction yoke. Similarly, another similar construction yoke is attached to the other side of the insulator continuous yoke.

  Each semi-metal wheel is attached to the retaining portion on the side where the existing electric wire is located of each retaining metal fitting attached to each construction yoke, and the front end of the parent wire is connected to the central portion of the front end edge of the continuous yoke. The construction yoke used in the wire replacement method according to claim 1, wherein the construction yoke is attached to and supported by each tip protruding portion of each construction yoke projecting from the front edge.

  According to the first aspect of the present invention, the construction yoke that can be easily attached to the existing insulator series yoke is used, and the construction yoke is attached to both sides of the existing insulator series yoke by projecting a part thereof. Since the existing two wires are temporarily supported on the outside of the continuous yoke, there is no need for complicated wire transfer as in the conventional work, and the parent wire in the hanging method is removed. Since it is supported at the central portion of the front end edge of the continuous yoke, it is possible to perform the wire re-installation work easily and in a short time in a state in which the two strips of the electric wire are connected to the insulator. Further, since the two wires are not rotated, the extra tension applied to the parent wire can be suppressed, so that the insulators of the insulator string are not damaged by falling forward.

  In addition, because the construction yokes are attached to both sides of the existing insulator series yokes, and the construction yokes are respectively attached, and the semi-metal wheels that temporarily support the two existing wires are provided separately from the outside of the series yokes. The distance between the tension clamp of each electric wire and each semi-metal wheel can be increased, and damage due to these contacts can be prevented, and each semi-metal wheel is positioned outside the left and right side of the chain yoke. Therefore, they do not contact each other and are not damaged. Furthermore, workability is improved because a sufficient space is obtained.

  Further, according to the invention of claim 2, since it has a simple configuration, it can be easily attached to an existing insulator series yoke, and is divided into left and right as a construction yoke, so that one construction The weight of the yoke can be reduced, and it is convenient to carry, especially when it is lifted to a high place.

  In the re-construction method using a large number of suspension wheels, which is performed when re-installing the wires stretched between steel towers, two strips are attached to the rear edge and two existing wires are attached to the front edge. A construction yoke is mounted on the square insulator yoke with a part projecting from both sides of the insulator yoke and the central part of the front end edge, and a suspension wheel is attached to the two existing wires. Attach each with a large number of intervals, attach semi-metal wheels to the protruding parts on both sides of each construction yoke, and temporarily pull the above two wires at one end of the wire wound around each semi-metal wheel. The two wires that are temporarily supported are separated from the insulator continuous yoke, and the front end of one of the separated wires is attached to and supported by the protruding portion of the front end edge of the construction yoke.

  One of the temporary support by the respective linear bodies of the two wires is released, and the other separated electric wire is suspended along the lower side of the one electric wire, and is supported by the protruding portion of the front end edge of the construction yoke. The other wire is pulled through the multiple suspension wheels as the parent wire of the above suspension wire method, the other wire is removed and the new wire connected to the rear end of the other wire is extended, and then the above The new wire and the one electric wire are temporarily supported by the respective linear bodies wound around each semi-metal wheel, and the front end of the one electric wire is removed from the protruding portion of the front end edge of each construction yoke. Is attached to and supported by the protrusion of the front edge of the construction yoke.

  Thereafter, the temporary support of the one electric wire and the new line by the respective linear bodies is released, respectively, the one electric wire is suspended along the lower side of the new line, and the one new wire is used as the new parent line. The electric wire is pulled through the plurality of suspension wheels to remove the electric wire and the new wire connected to the rear end of the electric wire is extended, and then the parent wire and Temporarily support each of the new lines, peel off and attach the front end of the new line to the continuous yoke, remove the front end of the new line as the parent line from the protrusion of the front end edge of the construction yoke, and The front end of the new line is attached to and supported by the continuous yoke, and the temporary support of each new line by each linear body wound around each semi-metal wheel is released.

  As a result, the construction yoke is attached to the existing insulator continuous yoke, and the main wire in the suspension method is supported and supported at the center of the interconnect yoke. Can be done easily and in a short time.

Embodiments of the present invention will be described below with reference to the drawings.
Here, FIG. 1 is a perspective view of a right construction yoke according to an embodiment of the present invention, FIG. 2 is a plan view of an upper plate of the right construction yoke, and FIG. 3 is a right construction yoke. FIG. 4 is a plan view of a retaining metal fitting of the construction yoke.

  As shown in FIG. 1, the construction yoke A is provided with two substantially L-shaped plate members facing each other, and a horizontally-long retaining metal fitting 3 between the front end edges of the two plate members. Are attached to connect the leading edges of the substantially L-shaped opposing ends, and the opposed protruding protrusions 1c on the right side of the substantially L-shaped are opened.

  These two plates are an upper plate 1 and a lower plate 2 and have almost the same configuration, but a part of the configuration is different. As shown in FIG. 2, the upper plate 1 has two through holes 1a arranged in parallel at the front end edge of the substantially L-shaped upper portion, and the bent portion of the upper plate 1 is provided in a substantially rectangular shape. The part is provided with four through holes 1b in the same arrangement as the positions of four existing through holes of the insulator yoke, which will be described later, and one through hole 1d is provided in the tip projecting part 1c. As shown in FIG. 3, the lower plate 2 has a configuration in which the tip protruding portion 1 c is not provided.

  As shown in FIG. 4, the retaining metal fitting 3 has a substantially horizontally long trapezoidal shape, and is provided with through holes 3a on the left and right side portions, and two through holes 3b are also provided between these through holes 3a. Are installed side by side. As shown in FIG. 1, such a clamp 3 is provided between the leading edges of the upper plate 1 and the lower plate 2 provided to face each other along the leading edge. The through holes 3a on the left and right side portions are protruded from both sides of the opposite end edges provided opposite to each other, and the two through holes 3b of the retaining metal fitting 3 and the respective end edges are provided. The positions of the two through holes 1a and 2a are matched, and bolts are fitted into these, respectively, and the nut is loosely tightened from the lower plate 2 side and temporarily fixed (not shown). FIG. 1 shows the right construction yoke a, and the right construction yoke a and the target construction are formed and prepared as the left construction yoke b (see FIG. 6).

  Next, these construction yokes A are used in the suspension method using a number of suspension wheels, in which the existing two wires C stretched between the two steel towers E are replaced with new ones. Then, replace the two wires C.

  Here, FIG. 5 shows a rectangular insulator continuous yoke 4 to which the construction yoke A according to the embodiment of the present invention is attached, and two existing electric wires C are respectively attached to the front end edges thereof via the tension clamps 5. FIG. 6 is a plan view of a state in which the two insulators 6 are attached to the rear end edge, and FIG. 6 is a plan view of a state in which the construction yokes a and b on the left and right sides are attached to the insulator yoke 4. FIG. 7 shows that the left and right construction yokes a and b are attached to the insulator series yoke 4, and the semi-metal wheel 7 is attached to the left and right retaining brackets 3 to temporarily support the two wires C. FIG.

  Further, FIG. 8 shows that the left and right construction yokes a and b are attached to the insulator series yoke 4, and the two semi-metal wheels 7 are attached to the left and right retaining brackets 3 to temporarily support the two wires C. FIG. 9 is a conceptual diagram of a state in which one electric wire C is further connected to the tip protruding portion 1c of each construction yoke a, b via two support wires 8 from the state of FIG. FIG. 10 is a partial plan view showing a state of supporting, and FIG. 10 shows a construction method according to an embodiment of the present invention. FIG.

  In this case, as shown in FIG. 5, the operator D gets on the tension clamps 5 of the two existing wires C connected to the insulator continuous yoke 4 and faces the insulator continuous yoke 4. The operation is performed in the state (indicated by an arrow in FIG. 5).

  The right side of the existing insulator yoke 4 to which the two insulators 6 are connected is sandwiched between the open end projections 1c of the right construction yoke a, and as shown in FIG. Each tip edge to which the arm is attached is projected from the right side of the insulator linkage yoke 4, and the tip projection 1c of the upper plate 1 of the right construction yoke a is raised from the front edge of the insulator yoke 4 so as to protrude. The right side construction yoke a is put on the insulator continuous yoke 4.

  Thereafter, the positions of the two existing construction holes 4a and the two horn mounting holes 4a on the right side of the insulator series yoke 4 (see FIG. 5), and the upper plate 1 and the lower plate 2 forming the right construction yoke a Align the positions of the through holes 1b and 2b provided in the base plate, insert bolts into them, and screw the nuts on the back side of the lower plate 2 to fix the right construction yoke a to the insulator series yoke 4. . Similarly, the left work yoke b is attached to the left side of the insulator yoke 4, and a suspension wheel is attached to each of the two existing electric wires C to be replaced (not shown).

  As shown in FIG. 7, the semi-metal wheel 7 is attached to each through hole 3a on the existing electric wire C side of each retaining metal fitting 3 attached to the right construction yoke a and the left construction yoke b.

  Further, as shown in FIG. 8, the cam along 10 provided at one end of each wire 9 wound around each semi-metal wheel 7 is attached to the electric wire C, and the two electric wires C are provided on each wire 9. Each of the electric wires C is temporarily supported by being pulled by the tension wire 11. Further, the tension clamps 5 of the two supported wires C are detached from the insulator series yoke 4, and the two wires C are separated from the insulator series yoke 4. Thereafter, as shown in FIG. 9, two of the front end protrusions 1 c of the right construction yoke a and the left construction yoke b projecting from the central edge of the front end edge of the insulator continuous yoke 4. Two support wires 8 are respectively attached to the two through holes 1d, and the front ends of the one separated electric wires C are connected and supported by these two support wires 8. At this time, one electric wire C is supported at the center position of the edge on the existing electric wire C side of the insulator continuous yoke 4. Thereafter, the temporary support of the two wires C by the wires 9 is released.

  As a result, as shown in FIG. 10, the one electric wire C is used as a parent wire C <b> 1 of the suspension method, and the other electric wire C <b> 2 is suspended downward by a plurality of suspension wheels 12 along the parent line C <b> 1. And the other electric wire C2 is pulled through the said many suspension wheels 12, the said electric wire C2 is removed, and the new line (illustration omitted) previously connected to the rear end of the said other electric wire C2 is extended. After that, again, the new wire extended with the one electric wire C which is the parent wire C1 by the temporary support wires 9 wound around the semi-metal wheel 7 supported on both sides of the left and right construction yokes a and b. Each wire is temporarily supported, and the front end of the one electric wire C is removed from the two wire 8 with the base extending from the tip protruding portions 1c of the right construction yoke a and the left construction yoke b. Is connected to these two wires 8 with a base to support them. At this time, the new line is supported at the center position of the edge on the side of the existing wire C of the insulator continuous yoke 4. Thereafter, the temporary support of the one electric wire C and the new wire by the temporary support wires 9 wound around the semi-metal wheel 7 is released.

  Then, with this new line as a new parent line, the one electric wire C is suspended downward by a number of suspension wheels 12 along the parent line in the same manner as described above. Therefore, the one electric wire C is pulled through the plurality of suspension wheels 12 to remove the electric wire C, and a new line connected to the rear end of the electric wire C is extended. Furthermore, each of the wires 9 for temporary support wound around the semi-metal wheel 7 temporarily supports the parent wire and the newly extended new wire, and a tension clamp 5 is provided at the front end of the new wire, This is attached to and supported by the through hole of the continuous yoke 4 and is connected to the two wire 8 with the base attached to the tip protruding portions 1c of the right construction yoke a and the left construction yoke b. The tension clamp 5 is attached to the front end, and the front end of the new line is further attached to the through hole of the continuous yoke 4 to support it.

  Thereafter, the temporary support of each new line by each wire 9 of each semi-metal wheel 7 attached to each retaining metal fitting 3 is released. Finally, the right-hand construction yoke a and the left-hand construction yoke b attached to the insulator continuous yoke 4 are removed to complete the work.

  Further, when the construction yoke A is attached to the existing insulator yoke 4, the right construction yoke a and the left construction yoke b are inserted into the through holes having the same arrangement as the existing through holes 4a of the insulator yoke 4. Since the holes 1b and 2b are provided and the construction yoke A is attached to the insulator continuous yoke 4 by using these through holes 4a, 1b and 2b, they can be easily attached and have high versatility.

  In the above embodiment, the construction yoke A is provided with the right construction yoke a and the left construction yoke b, respectively, but these do not necessarily have to be divided into two parts. The upper plate 1 for the right side construction yoke a and the left side construction yoke b may be prepared, and these may be used integrally. The upper plate 1 and the lower plate 2 are opposed to each other to form the left and right construction yokes a and b. However, the upper plate 1 and the lower plate 2 are not necessarily used. Alternatively, two upper plates 1 may be provided opposite to each other to form a construction yoke, or only the upper plate 1 may be used if it can withstand the load.

  In addition, the shape of the retaining metal fitting 3 is a substantially horizontally long trapezoidal shape, but the shape of the retaining metal fitting 3 is not limited to this, and is fitted between the opposed leading edges of the upper part of the construction yoke A, and is already installed. What is necessary is just to make the through-hole 3a protrude on the electric wire C side. When the construction yoke A is attached to the existing insulator yoke 4, the right construction yoke a and the left construction yoke b are arranged in the same manner as the existing through holes 4a of the insulator yoke 4. 1b and 2b are provided, and the construction yoke A is attached to the insulator continuous yoke 4 using these through holes 4a, 1b and 2b, but the method of attaching to the insulator continuous yoke 4 is not limited to this. .

It is a perspective view of the yoke for right side construction of the Example of this invention. It is a top view of the upper board of the yoke for right side construction of the Example of this invention. It is a top view of the lower board of the yoke for right side construction of the Example of this invention. It is a top view of the retaining metal fitting of the construction yoke of the Example of this invention. It is a top view of the insulator continuous yoke of the state which attached the two existing electric wires which attach the construction yoke of the Example of this invention, and two insulators. It is a top view of the state which attached the construction yoke on the right and left side to the insulator continuous yoke of the Example of this invention. In the embodiment of the present invention, the left and right construction yokes are attached to the insulator continuous yoke, and two semi-metal wheels are attached to the left and right retaining brackets to temporarily support two wires. FIG. In this embodiment of the present invention, the left and right construction yokes are attached to the insulator continuous yoke, and two semi-metal wheels are attached to the left and right retaining brackets to temporarily support two wires. is there. According to the embodiment of the present invention, the left and right construction yokes are attached to the insulator yoke, and the two gold wheels are attached to the left and right retaining brackets to temporarily support the electric wire, and two are provided on the projecting portion of each construction yoke. It is a partial top view of the state which attaches the wire with a base and is supporting one electric wire. It is a front view of the state where one electric wire was made into a parent wire and the other electric wire was suspended by the hanging method using the construction yoke of the embodiment of the present invention. It is a perspective view of the state where two strips of electric wires are stretched across two strips of string before and after a conventional armature of a steel tower.

Explanation of symbols

A construction yoke C electric wire a right construction yoke b left construction yoke 1 upper plate 2 lower plate 3 retaining bracket 4 insulator series yoke 6 insulator series 7 semi-gold wheel 9 wire 12 suspension wheel

Claims (2)

In the re-construction method using a number of suspension cars that are performed when re-wiring the wires stretched between steel towers,
Two insulators are attached to the rear edge and two existing wires are attached to the front edge, on a square insulator yoke, partly from both sides of the insulator yoke and the center of the front edge. Attach the construction yoke to project, and attach the suspension wheel to the existing electric wires in the above 2 articles with a large number of intervals,
A semi-metal wheel is attached to the projecting portions on both sides of each construction yoke, and the two wires are temporarily supported by one end of a linear body wound around each semi-metal wheel, and the temporary support 2 Each of the striped wires is separated from the insulator series yoke, and the front end of one of the separated wires is attached to and supported by the protruding portion of the front end edge of the construction yoke. Release the support, respectively, suspend the other disconnected electric wire along the lower side of the one electric wire, and support the one electric wire supported by the projecting portion of the front edge of the construction yoke as the parent wire of the lifting method. By pulling the other electric wire through a number of suspension wheels and removing the electric wire, the new wire connected to the rear end of the other electric wire is extended, and then each linear body wound around each semi-metal wheel. The new line and one of the above Line to the respective temporary support,
Remove the front end of the one wire from the projecting portion of the front end edge of each construction yoke, attach the front end of the new wire to the projecting portion of the front end edge of the construction yoke, and then Release the temporary support of the one electric wire and the new wire, respectively, and drop the one electric wire along the lower side of the new wire,
Using the new line as a new master line, pulling the one electric wire through the plurality of suspension wheels to remove the electric wire and extending the new line connected to the rear end of the electric wire, The main line and the new line are temporarily supported by the respective linear bodies wound around the car, the front end of the new line is attached to and supported by the continuous yoke, and the front end of the new line as the main line is supported by the construction yoke. Remove from the protruding part of the front end edge of, and further, attach the front end of the new line to the continuous yoke and support it,
Furthermore, the temporary re-supporting of each said new line by each linear body wound around each said semi-metal wheel is cancelled | released, respectively, The redrawing method of an electric wire characterized by the above-mentioned. In the above-described wire replacement method according to claim 1,
Two substantially L-shaped plate bodies are provided opposite to each other, and a horizontally-long holding metal fitting is attached between each of the two L-shaped upper end edges of the two plate bodies to connect the opposite end edges. Fixing and providing a work yoke with the substantially L-shaped bent right-side opposite tip protrusions open;
In each of the above-described wire re-stripping methods, each of the ends of the existing rectangular insulator series yoke to which two strips of insulator series are attached is sandwiched by the projecting protrusions of the open end of the construction yoke and the clasps are attached. The edge is protruded from one side of the insulator continuous yoke, and each tip protrusion of the construction yoke is protruded from the front edge of the insulator continuous yoke, and the insulator yoke is covered with the construction yoke. In the same way, attach another similar construction yoke to the other side of the insulator series yoke,
Each semi-metal wheel is attached to the retaining portion on the side where the existing electric wire is located of each retaining metal fitting attached to each construction yoke, and the front end of the parent wire is connected to the central portion of the front end edge of the continuous yoke. 2. The construction yoke used in the wire replacement method according to claim 1, wherein the construction yoke is attached to and supported by each projecting tip portion of each construction yoke projecting from the front end edge.

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