JP2011229230A - Cable slack observation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable slack observation apparatus capable of easily adjusting an observation height of a height standard observer and remarkably shortening the time required for observing the slack of a cable.SOLUTION: A cable slack observation apparatus includes: a sliding rail 2 fixed to one steel tower 60 between two steel towers 50, 60 and extending vertically; a movable stage 3 vertically movably mounted to the sliding rail 2; and a height standard observer 10 which is mounted on the movable stage 3 and turned horizontally so as to observe a reference point A1 of the other steel tower 50 between the two steel towers 50, 60 and a lowermost point 30c of the slack of a power transmission line 30.

Description

  The present invention relates to a cable slackness observation device for observing the slackness of cables such as transmission lines laid between steel towers, and in particular, a cable slackness capable of easily adjusting the observation height of a height level observer. This relates to the degree observation device.

  The transmission line laid between the steel towers has a moderate slack in consideration of changes in the length due to thermal expansion. The slackness (sag) of the transmission line varies depending on the distance between the towers, and when laying the transmission line, the slackness of the transmission line is observed between the towers. For the observation of the sag, check whether the height of the reference point attached to one of the towers is the same as the height of the lowest point of the sag of the transmission line using a height level observer installed on the other pylon. It is done by observing.

  When newly laying a transmission line or replacing a transmission line, it is necessary to observe the slackness of the transmission line using a height level observer. In this case, the height level observer is first fixed to one steel tower, and the aim of the height level observer is adjusted to the height reference point of the other steel tower. After that, the lowest point of the slack of the transmission line is observed with the height level observer, and the lowest point of the slack of the transmission line is aligned with the aim of the level observer.

  As an example of a technique for observing the slackness of a power transmission line, a device (see, for example, Patent Document 1) that attaches a transit to a step bolt of a steel tower via a connection fitting and observes the slackness of the power transmission line is known.

Japanese Utility Model Publication No. 06-28621

  However, in order to align the aim of the height level observation device with the height reference point of the other tower, it is necessary to move the height level observation device up and down and keep the height level observation device horizontal. There is a problem that it is a simple task but takes a long time. This is because as the height level observer moves up and down, it is necessary to remove the height level observer fixed to the tower once from the tower, and the aim of the height level observer is the height reference of the other tower. If it does not fit, the height level observer will be fixed and removed many times.

  In addition, there is a time difference between the reference point attached to the tower and the actual installation of the transmission line, and the outside air temperature changes with the passage of time, so that the set value for the slackness of the transmission line is corrected. Is required. When correcting the set value of power line slack, it is necessary to change the reference point attached to the tower, and as the reference point is changed, the height level observer is fixed and removed repeatedly as described above. It will be. Therefore, if there is a cable sag observation device that can easily adjust the observation height of the height level observer, it is very convenient and the time required for observing the transmission line sag can be shortened. .

  In the invention of Patent Document 1, since the transit cannot be moved in the vertical direction while keeping the transit in a horizontal state, the aim of the transit cannot be adjusted to the reference point attached to the steel tower. It cannot be applied to the observation of transmission line sag using an observer.

  Accordingly, the present invention has an object to provide a cable sag observation device that can easily adjust the observation height of a height level observer and can significantly reduce the time required for observing the sag of a transmission line. To do.

  In order to achieve the above object, the invention according to claim 1 is an electric wire sag observation device for observing slack of a cable such as a power transmission line or a communication line laid on an adjacent columnar body, wherein the adjacent columnar shape A sliding rail fixed to one columnar body of the body and extending in the vertical direction; a movable base attached to the sliding rail so as to be movable in a vertical direction; A cable sag observation device comprising a reference point of the other columnar body among the adjacent columnar bodies and a height level observer capable of observing the lowest point of slackness of the cable.

  According to the present invention, the height level observer can be moved in the vertical direction by moving the movable base in the vertical direction along the slide rail fixed to one of the columnar bodies. The observation height of the observation device can be easily adjusted.

  According to a second aspect of the present invention, in the cable sag observation apparatus according to the first aspect, the columnar body is configured to project in a direction perpendicular to the slide rail at an end portion in the vertical direction of the slide rail. The present invention is characterized in that a magnet capable of being attracted to the steel material is provided.

  According to the first aspect of the present invention, since the observation height of the height level observer can be adjusted, the observation height of the height level observer can be easily set at the reference point of the other columnar body. The time required to observe the slackness of the cable can be greatly reduced. As a result, it is possible to shorten the work time at a high place and reduce the cost of the sag observation work.

  According to invention of Claim 2, since the magnet which can adsorb | suck with respect to the steel material which comprises a columnar body is provided in the edge part of the up-down direction of the slide rail, the coupling of the steel material which comprises a columnar body Even when the slide rail is fixed to the portion, the slide rail can be fixed across the joint bolts. Therefore, the slide rail can be quickly and reliably fixed to the columnar body.

It is a perspective view of the cable slackness observation device in an embodiment of the invention. It is a schematic diagram of the sag observation work of a power transmission line using the cable sag observation apparatus of FIG. It is a perspective view of the height level observation device in the cable slackness observation device of FIG. It is a top view of the height level observer of FIG. It is an observation figure at the time of observing the sag of the transmission line in the laying work of the transmission line using the cable sag observation device of FIG. 1, wherein (a) sets the aim of the height level as the first reference point of the tower. An observation diagram showing the combined state, (b) is an observation diagram showing the positional relationship between the first reference point and the second reference point of the tower, and (c) is a height level observer at the second reference point of the tower. (D) is an observation diagram showing the positional relationship between the aim of the height level observer aligned with the second reference point of the tower and the lowest point of the wire, (e) Fig. 4 is an observation diagram showing a state where the lowest point of the electric wire is aligned with the aim of the height level observation device. It is a perspective view which shows the state which attached the cable slackness observation apparatus of FIG. 1 to the joint part of the steel tower. It is a perspective view which shows the state which attached the height level observer of FIG. 3 to the joint part of the steel tower. It is sectional drawing which follows the ZZ line | wire of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 8 show an embodiment of the present invention. As shown in FIG. 2, the cable slackness observation apparatus 1 is used to observe slackness of a transmission line 30 as a cable laid between a steel tower 50 as one columnar body and a steel tower 60 as the other columnar body. Used. As shown in FIG. 1, the cable slackness observation device 1 includes a slide rail 2, a movable table 3, a height level observer 10, and magnets 21 and 22. The slide rail 2 is composed of a rod-like member that extends linearly in the vertical direction. The slide rail 2 is made of, for example, an aluminum alloy or a magnesium alloy in order to ensure weight reduction and strength. The slide rail 2 has a quadrangular cross-sectional shape, and a scale 2c for measuring the height in the vertical direction is provided on one of the four side surfaces.

  Magnets 21 and 22 that can be attracted to a steel material constituting the steel tower 60 are respectively provided at the ends of the slide rail 2 in the vertical direction. The magnet 21 is fixed to the upper end 2 a of the slide rail 2. The magnet 21 protrudes in a direction orthogonal to the longitudinal direction of the slide rail 2, and an end surface in the protruding direction is formed on the attracting surface 21a. The magnet 22 is fixed to the lower end 2 b of the slide rail 2. The magnet 22 protrudes in a direction orthogonal to the longitudinal direction of the slide rail 2, and an end surface in the protruding direction is formed on the attracting surface 22a. The magnet 22 is set to have a longer length B in the protruding direction than the magnet 21. This is because the slide rail 2 is fixed across the joint portions of the steel materials 61 and 62 constituting the steel tower 60 as shown in FIG. Therefore, by setting the length of the magnet 22 to be slightly longer than that of the magnet 21, the slide rail 2 can be fixed substantially parallel to the steel materials 61 and 62.

  A movable base 3 is attached to the slide rail 2 so as to be movable in the vertical direction. The movable table 3 is composed of a rectangular metal block. The movable table 3 is made of, for example, an aluminum alloy, a magnesium alloy, or the like in the same manner as the slide rail 2 in order to ensure weight reduction and strength. The movable table 3 is formed with a holding hole 3a into which the slide rail 2 is inserted. The movable table 3 is fitted to the slide rail 2 with almost no gap like a caliper, for example, and is movable in the vertical direction with respect to the slide rail 2. An iron fixed surface 3 b for fixing the height level observer 10 is provided on the outer surface of the movable table 3.

  A height level observer 10 can be fixed to the fixed surface 3 b of the movable table 3. Here, the height level observer 10 is an instrument for grasping whether or not the height of an object to be observed is the same as a reference height, and is also called a pocket compass, for example. . As shown in FIG. 3, the height level observer 10 includes a telescope 11, an angle meter 12, a horizontal base 13, a spherical surface fixing portion 14, a support shaft 15, a horizontal shaft 16, and a magnet 17. The telescope 11 is for magnifying and observing a distant object, and has an observation window 11a at the end. The telescope 11 is provided with an aim P for determining the position with respect to the object to be observed. The aim P can be visually confirmed by looking through the observation window 11a. The telescope 11 is capable of observing the reference points A1 and A2 of the steel tower 50 and the lowest point 30c of the slackness of the power transmission line 30 at a distant position.

  The goniometer 12 to which the telescope 11 is attached is rotatable in the horizontal direction with respect to the horizontal base 13. The angle measuring unit 12a of the goniometer 12 has a function of supporting the telescope 11 so as to be swingable in the vertical direction and measuring the swing angle of the telescope 11 in the vertical direction. In this embodiment, since the telescope 11 is always used with the axis F2 in a horizontal state, angle adjustment in the vertical direction of the telescope 11 is not necessary. The rotating portion 13a of the horizontal base 13 to which the goniometer 12 is attached is composed of a disk-shaped member and can be rotated in the horizontal direction (arrow E1 direction and arrow E2 direction).

  Levels 12 c and 12 d are provided on the upper surface of the rotating portion 13 a of the horizontal base 13. One level 12c and the other level 12d are spaced apart such that their extension lines are orthogonal to each other. The rotating portion 13a is configured to be horizontal when the bubble 12c1 of one level 12c and the bubble 12d1 of the other level 12d are respectively located in the center. The telescope 11 is attached so that the axis F2 is always parallel to the horizontal axis F1 of the rotating portion 13a. Therefore, the telescope 11 can be set to be horizontal by setting the horizontal base 13 to be horizontal by the level levels 12c and 12d.

  A spherical surface fixing portion 14 is provided on the lower surface of the horizontal base 13. The spherical fixed portion 14 is connected to the support shaft 15 so as to be swingable in the entire circumferential direction. The spherical surface fixing portion 14 has a function of locking the movement of the horizontal base 13 with respect to the support shaft 15 by a lock screw (not shown). The lower end portion of the support shaft 15 is fixed to a horizontal shaft 16 composed of a square bar such as an aluminum alloy. A magnet 17 is attached to the end of the horizontal shaft 16 in the axial direction. The attracting surface 17 a of the magnet 17 can be attracted to the fixed surface 3 b of the movable table 3.

  Next, the procedure and operation of wire sag observation using the cable sag observation device 1 will be described.

  As shown in FIG. 2, when laying the power transmission line 30 between one steel tower 50 and the other steel tower 60, it is necessary to give the power transmission line 30 an appropriate slack. In the work, it is necessary to observe the slack of the power transmission line 30. The value of the slack of the power transmission line 30 is determined based on the distance L between the steel towers. Adjustment of the slackness of the power transmission line 30 is performed by winding or rewinding one of the power transmission lines 30 with a winch 40 provided on the ground side.

  The slack of the power transmission line 30 is the length from the support ends 30a, 30b of the power transmission line 30 to the lowest point 30c of the power transmission line 30, and this slack value H1 is set corresponding to a predetermined outside air temperature. When the slack value H1 is determined based on the outside air temperature when starting the laying operation of the power transmission line 30, a first reference point A1 is attached to the steel tower 50 by an operator (not shown) rising on the steel tower 50.

  Next, on the steel tower 60 side, the slide rail 2 is fixed to the steel tower 60 by the worker M1. Since the slide rail 2 can be fixed to the steel tower 60 with the magnets 21 and 22, the slide rail 2 can be fastened to the steel tower 60 more quickly and reliably than when a portable vise or a clamp is used. It can be fixed. Thereafter, the height level observer 10 is attached to the movable table 3. The height level observer 10 is attached to the movable table 3 by adsorbing the attracting surface 17a of the magnet 17 to the fixed surface 3b of the movable table 3.

  When the installation of the height level observer 10 is completed, adjustment for leveling the horizontal base 13 of the height level observer 10 is performed. This adjustment operation is performed using the spirit levels 12c and 12d in a state where the lock of the spherical surface fixing portion 14 is released. That is, the horizontal base 13 is swung so that the bubble 12c1 of one level 12c and the bubble 12d1 of the other level 12d are respectively located in the center, and the spherical base is fixed in a state where the level 13 is horizontal. 14 is locked with a lock screw. Thereby, the axis F2 of the telescope 11 is also horizontal.

  After the horizontal table 13 is brought into the horizontal state, adjustment is performed to align the aim P of the telescope 11 with the reference point A1 of the tower 50. This adjustment is performed by moving the movable base 3 in the vertical direction with respect to the slide rail 2. FIG. 5A shows a state in which the aim P of the telescope 11 is set to the first reference point A1 of the tower 50. FIG. Here, when the outside air temperature at the time of setting the slack of the power transmission line 30 in the laying operation of the power transmission line 30 is not changed with respect to the outside air temperature when the first reference point A1 is attached to the tower 50, the power transmission line No temperature correction is required for 30 slacks.

  In this case, with the aim P of the telescope 11 aligned with the first reference point A1 of the tower 50, the rotating portion 13a of the horizontal base 13 is rotated in the horizontal direction, and the telescope 11 is placed at the bottom of the transmission line 30. Point to point 30c. Then, looking into the observation window 11 a of the telescope 11, the power line 30 is wound or unwound by the winch 40 until the lowest point 30 c of the power line 30 coincides with the aim P of the telescope 11. The height of the point 30c is adjusted. In a state where the height of the lowest point 30c of the transmission line 30 coincides with the first reference point A1, the support end 30b of the transmission line 30 is fixed to the tower 60 side, and the transmission line between the tower 50 and the tower 60 30 laying is finished.

  When the outside temperature at the time of setting the slack of the transmission line 30 in the laying operation of the transmission line 30 changes with respect to the outside temperature when the reference point A1 is attached to the steel tower 50, the transmission line based on the change in the outside temperature The amount of slack of 30 is calculated. Then, a second reference point A2 corresponding to the amount of slack is attached to the steel tower 50. FIG. 5B shows a positional relationship between the aim P of the telescope 11 and the first reference point A1 and the second reference point A2 of the tower 50. In this state, the distance between the first reference point A1 and the second reference point A2 is H2.

  Next, the movable table 3 is moved in the vertical direction with respect to the slide rail 2, and the aim P of the telescope 11 is adjusted to the second reference point A2. FIG. 5C shows a state in which the aim P of the telescope 11 is set to the second reference point A2. Here, since the posture of the movable table 3 does not change even if it is moved in the vertical direction with respect to the slide rail 2, the horizontal table 13 also maintains the horizontal state regardless of the movement of the movable table 3. Therefore, fine adjustment for making the telescope 11 horizontal again becomes unnecessary. Next, the rotation unit 13 a of the goniometer 12 is rotated in the horizontal direction with respect to the horizontal base 13, and the telescope 11 is directed to the lowest point 30 c of the power transmission line 30.

  FIG. 5D shows the positional relationship between the aim P and the lowest point 30c of the transmission line 30 in a state where the aim P of the telescope 11 is aligned with the second reference point A2 of the steel tower. As shown in FIG. 5D, the distance between the aim P of the telescope 11 and the lowest point 30c of the power transmission line 30 is H3. Then, the worker M1 gives an instruction to the worker M2 so that the lowest point 30c of the transmission line 30 coincides with the aim P of the telescope 11 while looking through the observation window 11a of the telescope 11. The worker M2 on the ground side appropriately operates the winch 40 to wind or unwind the power transmission line 30 according to an instruction from the worker M1, and adjusts the height of the lowest point 30c of the power transmission line 30.

  FIG. 5 (e) shows a state where the lowest point 30 c of the transmission line 30 coincides with the aim P of the telescope 11. In this state, the height of the lowest point 30c of the transmission line 30 coincides with the second reference point A2 attached to the tower 50, and in this state, the support end 30b of the transmission line 30 faces the tower 60 side. The installation of the power transmission line 30 between the tower 50 and the tower 60 is completed.

  FIG. 6 shows a state in which the cable slackness observation apparatus 1 is attached to a joint portion between the steel material 61 and the steel material 62 of the steel tower 60. As shown in FIGS. 7 and 8, the joint portion between the steel material 61 and the steel material 62 is connected by a joint bolt 63, but the joint portion is uneven due to the step D or the head of the joint bolt 63. Therefore, for example, even if the magnet 17 of the height level observer 10 is attached to the joint portion, a gap S is generated between the magnet 17 and the attachment surface 61a of the steel material 61 and the attachment surface 62a of the steel material 62, and the height level. The observation device 10 cannot be fixed in a stable state. Therefore, as shown in FIG. 6, it is possible to fix the slide rail 2 across the joint bolt 63 and the step D by using the magnets 21 and 22 provided at both ends of the slide rail 2. Become. Therefore, the slide rail 2 can be fixed to the steel tower 60 quickly and reliably.

  As described above, by using the slide rail 2, the observation height of the height level observer 10 can be adjusted, so that the observation height of the height level observer 10 is set as the reference of the other tower 50. It can be easily adjusted to the points A1 and A2, and the time required for observing the slackness of the power transmission line 30 can be greatly shortened. As a result, it is possible to shorten the work time at a high place and reduce the cost of the sag observation work.

  In this embodiment, the scale 2c of the slide rail 2 is not used for sag observation, but the movable table 3 is only a length corresponding to the amount of correction of sag associated with changes in the outside air temperature with the scale 2c as a reference. By moving in the vertical direction, it is not necessary to attach the second reference point A2 to the steel tower 50, and it is possible to further reduce the working time of sag observation.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, in the embodiment, both ends of the slide rail 2 are fixed to the steel tower 60 via the magnets 21 and 22, but both ends of the slide rail 2 are means other than magnets, for example, portable. It is good also as a structure fixed to a steel tower using a special vise (clamp) or an exclusive fixing tool. Further, the movable table 3 may be provided with a lock mechanism that locks the movement with respect to the slide rail 2.

DESCRIPTION OF SYMBOLS 1 Cable looseness observation apparatus 2 Slide rail 3 Movable base 10 Height level observation device 21 Magnet 22 Magnet 30 Transmission line (cable)
30c lowest point 50 steel tower (columnar body)
60 Steel tower (columnar body)
A1 First reference point (reference point)
A2 Second reference point (reference point)

Claims (2)

A wire sag observation device that observes slack in cables such as power transmission lines and communication lines laid on adjacent columnar bodies,
A sliding rail that is fixed to one of the adjacent columnar bodies and extends in the vertical direction;
A movable base attached to the slide rail so as to be movable in the vertical direction;
A height level observer that is attached to the movable base and that can observe the reference point of the other columnar body and the lowest point of the slack of the cable by horizontal rotation,
A cable sag observation device characterized by comprising:   2. A magnet that can be attracted to a steel material that protrudes in a direction perpendicular to the slide rail and forms the columnar body is provided at an end portion of the slide rail in the vertical direction. Cable slackness observation device as described in 1.

Images