JP2001165660A - Survey target apparatus, mounting device of surveying apparatus, and iron tower surveying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a survey between cable support points 2 without any service interruption for the work. SOLUTION: A base part 11 has a grasping part 11b. An insert part 12 having a diameter fittable to the through-hole 4 of the load suspending plate 3 of an iron tower 1 is provided on the base part 11. A retaining member 13 is mounted on the base part 11 so as to attachably and detachably press the edge of the load suspending plate 3 by elastic force when the insert part 12 is fitted to the through-hole 4. A magnet 15 is provided between the insert part 12 of the base part 11 and the retaining member 13 so as to be attracted to the load suspending plate 3 when the insert part 12 is fitted to the through-hole 4 to press the edge of the load suspending plate 3 by the retaining member 13. A target 14 is provided on the base part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveying target instrument that can be attached to a tower, a surveying instrument mounting device, and a method for surveying a tower using the same.

[0002]

2. Description of the Related Art As a conventional survey target instrument and a tower surveying method, there is a technique disclosed in Japanese Patent Publication No. 7-85016. That is, this is a technique in which a surveying target using a retroreflective sheet is attached near a wire support point of a power transmission tower, and a distance between an observation point and a surveying point of the surveying target is measured by a light wave measuring instrument.

[0003]

In recent years, there has been a demand for extending the life of existing facilities by improving repairs and inspections of existing power transmission towers. It is necessary to perform surveying between wire support points for improvement work on power transmission equipment such as rewiring of wires, but in order to attach conventional surveying target equipment to a power transmission tower, a power outage must be performed for work safety. There is a need. However, in consideration of the demand for electricity, there was a problem that it was not possible to easily perform a work power outage.

[0004] The present invention has been made in view of such conventional problems, and is a surveying target instrument, a surveying instrument mounting apparatus, and a tower surveying instrument that enable surveying between wire support points without performing a power outage. It is intended to provide a way.

[0005]

According to a first aspect of the present invention, there is provided a surveying target instrument according to the first aspect of the present invention, which is a load-suspension plate provided on a steel tower, which is made of an iron plate and has a through hole. A survey target instrument attachable to the base; a base, an insert, a holding member, a magnet,
A base having a grip portion; the insertion portion having a diameter capable of fitting into the through-hole provided on the base; and a holding member connecting the insertion portion to the through-hole. The magnet is fitted to the base so as to removably press an edge of the load suspending plate when attached to the base; the magnet fits the insertion portion into the through-hole so as to move an edge of the load suspending plate. It is provided between the insertion part of the base and the holding member so as to be attracted to the load suspending plate when pressed by the holding member; and the target is provided on the base.

[0006] The target may be provided on the base in the same direction as the insertion direction of the insertion portion, may be provided in a direction perpendicular to the insertion direction, or may be provided in another direction. Preferably, the target comprises a retroreflective sheeting having a plurality of trihedral cube corner lens elements on the reflecting surface.

[0007] The surveying target instrument according to the first aspect of the present invention, when attached to a load suspending plate of a steel tower, grips and supports a grip portion using a working rod, and inserts an insertion portion into a through hole of the load suspending plate. The magnets are fitted, the edge of the load suspending plate is pressed by the holding member, and the magnet is attracted to the load suspending plate. Thereby, it can be safely and easily attached to the steel tower, and the distance between the observation point and the measurement point of the target and the angle between the observation point and the two targets can be measured by the lightwave measurement device. The surveying target instrument according to the first aspect of the present invention can be attached to a steel tower using a work bar, so that surveying between wire support points can be performed without a power outage.

According to a second aspect of the present invention, there is provided a surveying instrument mounting apparatus which can be attached to a steel tower having an electric wire supporting portion in which one ends of two iron arms are joined and the other ends are opened. An instrument mounting device; a substrate, two guide plates,
A magnet, and a mounting portion; each guide plate is provided rotatably along the mounting surface in a state perpendicular to the mounting surface of the substrate; the magnet is provided on an outer surface of each guide plate; The attachment portion is provided on the substrate so that the survey target instrument can be attached.

[0009] The surveying instrument mounting device according to the second aspect of the present invention is mounted on a steel tower having an electric wire supporting portion formed by joining one end of two iron arms and opening the other end.
When mounting on such a tower, the work bar is held and supported, the substrate is supported on each arm, each guide plate is along the facing surface of each arm, and the magnet is attached to the arm so that it is attracted to each arm . At this time, since each guide plate is attracted along the facing surface of each arm, the mounting portion is located at the fixed position of the arm, and the measuring point can be set at the fixed position. In this way, it can be safely and easily attached to the tower, and the distance between the observation point and the measurement point of the survey target instrument and the angle between the observation point and the two measurement points can be accurately measured by the lightwave measuring device. can do. The surveying instrument mounting device according to the second aspect of the present invention enables the surveying target instrument to be attached to the steel tower using the work bar even when the steel tower does not include the load suspending plate. Enables surveying between wire support points without doing so.

According to a third aspect of the present invention, there is provided a surveying instrument mounting apparatus according to the present invention, in which two iron arms are joined at one end, and the other end is opened. An instrument mounting device; a substrate, two guide plates,
A connecting member, a magnet, and a mounting portion; each guide plate is provided rotatably along the mounting surface in a state perpendicular to the mounting surface of the substrate; and the connecting member is parallel to the mounting surface. Elongate and rotatably mounted on each guide plate at a position equidistant from the center of rotation of each guide plate in a direction opposite to each other and at intervals allowing the respective guide plates to be arranged in parallel with each other; The mounting part is provided on the substrate so that the surveying target instrument can be mounted.

The surveying instrument mounting device according to the third aspect of the present invention is mounted on a steel tower having an electric wire supporting portion in which one ends of two iron arms are joined and the other ends are opened.
When mounting on such a tower, the work bar is held and supported, the substrate is supported on each arm, each guide plate is along the facing surface of each arm, and the magnet is attached to the arm so that it is attracted to each arm . At this time, since the respective guide plates are connected by the connecting member, they rotate in opposite directions at an equal angle from a state parallel to each other. Thus, since each guide plate is attracted to the facing surface of each arm without being shifted, the mounting portion is securely positioned at the fixed position of the arm, and the measuring point can be accurately set at the fixed position. In this way, it can be safely and easily attached to a steel tower, and the distance between the observation point and the target measurement point and the angle between the observation point and the two targets can be more precisely measured by a light wave measuring instrument. Can be. The surveying instrument mounting apparatus according to the third aspect of the present invention allows the surveying target instrument to be attached to the steel tower using the work bar even when the steel tower does not include the load suspending plate. Enables surveying between wire support points without doing so.

According to a fourth aspect of the present invention, there is provided a surveying instrument mounting device according to the second or third aspect, further comprising the surveying target device according to the first aspect, wherein the mounting portion has a mounting through hole. The insertion portion is fitted in the through hole for attachment, and the survey target instrument is attached to the attachment portion.

According to a fourth aspect of the present invention, the surveying instrument mounting apparatus according to the present invention utilizes the surveying target instrument of the first aspect to provide the same operation and effect as those of the second or third aspect. .

According to a fifth aspect of the present invention, there is provided a tower surveying method,
2. The two of the surveying target instruments of claim 1, wherein the insertion portion is fitted into the through hole, an edge of the load suspending plate is pressed by the holding member, and the magnet is attached to the load suspending plate. Attach and attach to each loading plate of two towers; Install a light wave measuring instrument at the observation point,
The modulated lightwave emitted by the lightwave measuring device is reflected by the target, the reflected modulated lightwave is received by the lightwave measuring device, and the distance between the observation point and each target and the observation point are measured by the lightwave measuring device. And measuring an angle between the target and each target, and calculating a distance between the targets from the distance and the angle.

According to a fifth aspect of the present invention, there is provided a method for surveying a tower according to the present invention. Without using a lightwave measuring instrument
The survey between the wire support points near the load suspending plate can be easily performed.

[0016] The method for surveying a steel tower according to the present invention according to claim 6 is as follows.
3. The surveying instrument mounting apparatus according to claim 2, wherein two of the surveying instrument mounting apparatuses each having a target mounted on the mounting portion, wherein the substrate is supported on each arm, and each guide plate is provided on each arm. Along the opposing surface, the magnet is attached to two towers so as to be attracted to each arm; a light wave measuring device is installed at an observation point, and the modulated light wave emitted by the light wave measuring device is reflected by the target and reflected. The modulated light wave is received by the light wave measuring device, the distance between the observation point and each target and the angle between the observation point and each target are measured by the light wave measuring device, and each target is measured from the distance and the angle. It is characterized in that a distance between them is obtained.

In the method for surveying a steel tower according to claim 6 of the present invention, even when the steel tower is not provided with a load suspending plate,
The surveying instrument mounting device according to claim 2, wherein the target is mounted on the mounting portion, can be safely and easily mounted on the steel tower by using the work rod. In addition, it is possible to easily and precisely measure the distance between the wire support points near the tip of the arm.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show an embodiment of the present invention. For the improvement work of the power transmission equipment such as the electric wire replacement, it is necessary to perform the surveying between the electric wire supporting points 2 of the power transmission tower 1 (see FIG. 6). When the steel tower 1 is provided with the load suspending plate 3, as shown in FIGS. 5A and 5B, the surveying target device 10 is attached to the load suspending plate 3 to perform the survey. The load suspending plate 3 is made of an iron plate, has a through hole 4 in the center (see FIG. 1A), and is mounted near the wire support point 2 of the arm 5 of the tower 1.

As shown in FIG. 1, a survey target instrument 1
0 has a base 11, an insertion portion 12, a holding member 13, a target 14, and a magnet 15. The base 11 has a plate shape, and integrally includes a square portion 11a, a grip portion 11b, and a mounting portion 11c. The grip portion 11b is arranged on the same plane as the square portion 11a, and the mounting portion 11c is provided perpendicular to the square portion 11a and the grip portion 11b. A circular hole 16a and an elongated hole 16b are formed in the grip portion 11b so as to be easily gripped by an insulating work bar (hot wire bar). The insulating work bar (hot wire bar) 6 (see FIGS. 4 and 5) can open and close the gripper at the other end by operating the operation unit at one end. The mounting portion 11c has four mounting holes 17 for fixing and two mounting holes 18 for mounting the holding member. The insertion portion 12 has a diameter that can be fitted into the through hole 4, and the mounting portion 1 is provided on the opposite side of the grip portion 11 b.
1c. The insertion section 12 is attached to the mounting section 1.
It is gradually tapered from the 1c side to the tip.

The holding member 13 is made of a leaf spring, and is attached to the mounting portion 1 so as to removably press the edge 3a of the load suspending plate 3 by elasticity when the insertion portion 12 is fitted into the through hole 4.
It is attached to two attachment holes 18 for attaching the holding member 1c with screws.

The magnet 15 is attached to the mounting portion 11c so that when the insertion portion 12 is fitted into the through hole 4 and the edge 3a of the load suspending plate 3 is pressed by the holding member 13, the magnet 15 is attracted to the load suspending plate 3. Attachment portion 11 between insertion portion 12 and holding member 13
It is embedded at a height that does not protrude from the plane c.

The target 14 is formed of a retroreflective sheet having a plurality of trihedral cube corner lens elements on the reflecting surface. The retroreflective sheet includes the brand name "Scotchlite-marked reflective sheet, diamond grade, 3970"
G (manufactured by Sumitomo 3M Limited) "is preferable. The retroreflective sheet has a wide-angle property and returns not only light from a direction perpendicular to the surface but also light from a direction inclined from the vertical direction to the direction in which the light was received.

As shown in FIG. 3, the target 14 has a red collimating frame 14a at the periphery of the reflection surface of the retroreflective sheet.
And a direction and center mark 14b on the left, right, and upper sides of the collimation frame. The collimation frame 14a is a frame for facilitating confirmation of the survey target 14 with the naked eye, a telescope, or the like. The direction and center mark 14b is a mark indicating the center of the survey target 14 to know the orientation of the survey target 14 at which the wide-angle property is maximum and to determine the position of the survey point. The target 14 further has a cross sight 14c inside the collimation frame 14a. The targets 14 are attached to both sides of the square portion 11a.

There are several types of towers 1.
There are various types from old to new. Tower 1
In the case where the load suspending plate 3 is not provided in the surveying instrument mounting device 2
0 is attached to the arm 5 of the tower 1 for surveying (Fig. 5
(See (A) and (B)). The steel tower 1 has an electric wire support portion formed by joining one end of two iron arms 5 and opening the other end.

As shown in FIG. 2, the surveying instrument mounting device 20
Is a substrate 21, two guide plates 22, and a connecting member 23.
, A magnet 24, and a mounting part 25. The substrate 21
A plurality of through holes 21a are provided on both sides of the center. The through holes 21a are arranged in a line in the length direction of the substrate 21. Each guide plate 22 has a female screw hole 22a at the center of the edge, and a male screw 26 is inserted into one of the through holes 21a of the substrate 21 and screwed with the female screw hole 21a.
Thereby, each guide plate 22 is attached to the mounting surface 21 of the substrate 21.
It is provided so as to be rotatable along the mounting surface 21b in a state perpendicular to b.

The connecting member 23 has through holes 23a at both ends, and further has a plurality of through holes 23a near one end between them. The connecting member 23 extends parallel to the mounting surface 21b on the opposite side of each guide plate 22. Each guide plate 22
A female screw hole 22b is provided at a position equidistant from the rotation center a in the opposite direction. The connecting member 23 is a male screw 2
7 are inserted into the through holes 23a, screwed into the female screw holes 22b, and rotatably attached to the respective guide plates 22.
The connecting member 23 is attached to each guide plate 22 so as to leave an interval b at which the respective guide plates 22 can be arranged in parallel with each other between attachment positions to the respective guide plates 22. Connecting member 2
3 and the guide plate 22 and between the connecting member 23 and the male screw 27, the gap holding members 28 and 29 are provided with the male screw 27.
Is provided.

Each guide plate 22 is attached to another through hole 21a of the substrate 21 so that the distance between the guide plates 22 can be changed. In this case, the connecting member 23 is provided with another through-hole 23 so that the guide plates 22 can be arranged in parallel with each other between mounting positions on the guide plates 22.
A male screw 27 is inserted into a and attached to each guide plate 22.

The magnets 24 are embedded in the outer surfaces of the respective guide plates 22 at a height that does not protrude from the respective surfaces so that the magnets 24 are attracted to the opposing surfaces 5a (see FIG. 5) of the respective arms 5 of the tower 1. An arrow 30 indicating the mounting direction is displayed on the substrate 21.

The mounting portion 25 has a plate shape and is vertically mounted at the center of the substrate 21 on the same side as the respective guide plates 22. The mounting portion 25 is mounted at a central position of the substrate 21 which is perpendicular to each guide plate 22 and equidistant from each guide plate 22 when the respective guide plates 22 are arranged in parallel.
The mounting portion 25 has a through hole 25a having the same size as the through hole 4 (see FIG. 1) of the load suspending plate 3 and corresponds to the four mounting holes 17 for fixing the mounting portion 11c of the survey target instrument 10. It has four mounting holes 31 to be formed.
The surveying target device 10 has the insertion portion 12 fitted into the through hole 25 a of the mounting portion 25, and is fixed to the mounting portion 25 by screws at four mounting holes 31.

In the tower surveying method using the survey target apparatus 10, first, two survey target apparatuses 10 are attached to each of the hanging plates 3 of the two towers 1, respectively. As shown in FIG. 4B, the gripping portion 11 b of the survey target device 10 is gripped and supported by using the working rod 6, the insertion portion 12 is fitted into the through hole 4, and the edge of the load suspending plate 3. 3 a is held by the holding member 13, the magnet 15 is attracted to the load hanging plate 3, and the survey target apparatus 10 is attached to each load hanging plate 3.

As shown in FIG. 6, a light wave measuring device 7 is installed at observation points A and B, the modulated light wave emitted from the light wave measuring device 7 is reflected by a target 14, and the reflected light wave is reflected by the light wave measuring device. At 7, light is received. In this way, the distance between the observation points A and B and the measurement point of each target 14 and the angle between the observation points A and B and the measurement point of each target 14 are measured by the lightwave measuring device 7, and the cosine is calculated from the distance and the angle. The distance between the targets 14 can be obtained using the theorem. In addition,
As shown in FIGS. 4B and 5B, the target 14
Since the distance between the measurement point and the wire support point 2 is known, the distance can be corrected to obtain an accurate distance between the wire support points 2 of the two towers 1.

In the tower surveying method using the surveying target device 10, the surveying target device 10 can be safely and easily attached to the load suspending plate 3 of the steel tower 1 by using the work rod 6, so that no work power outage occurs. Light wave measuring instrument 7
Thereby, the survey between the wire support points 2 near the load suspension plate 3 can be easily performed.

In the tower surveying method using the surveying instrument mounting device 20, first, two of the surveying instrument mounting devices 20 are attached to two steel towers 1, respectively. As shown in FIG. 5 (B), each surveying instrument mounting device 20 is mounted on the arm 5 by using the work bar 6, and the guide plate 22 is supported along the facing surface 5 a of each arm 5. The magnet 24 is attached to each of the towers 1 so that the magnets 24 are attracted to each of the arms 5. As shown in FIG. 6, light wave measuring devices 7 are installed at the observation points A and B, the distance between the targets 14 is obtained as described above, and the distance between the electric wire support points 2 of the two towers 1 is corrected. Can be obtained.

In the tower surveying method using the surveying instrument mounting apparatus 20, even when the tower 1 does not have the load hanging plate 3, the surveying instrument mounting apparatus 20 can be safely attached to the tower 1 using the work rod 6. Since it can be easily attached, the measurement between the wire support points 2 near the tip of the arm 5 can be easily and accurately performed by the lightwave measuring device 7 without performing a power failure.

Next, the operation will be described. When attaching the surveying target device 10 to the load suspending plate 3 of the steel tower 1,
The holding portion 11b is grasped and supported by using the working rod 6, the insertion portion 12 is fitted into the through hole 4 of the load suspending plate 3, and the edge 3a of the load suspending plate 3 is pressed by the holding member 13.
The magnet 15 is attracted to the load suspending plate 3. Thereby, it can be safely and easily attached to the tower 1. The distance between the observation points A and B and the measurement point of the target 14 and the observation points A and B and the two targets 1
4 can be measured. Since the surveying target instrument 10 can be attached to the steel tower 1 using the work bar 6, the surveying between the electric wire support points 2 can be performed without performing a power failure.

The surveying instrument mounting device 20 is mounted on the steel tower 1 having an electric wire supporting portion formed by joining one end of two iron arms 5 and opening the other end. When attaching to such a steel tower 1, the work bar 6 holds and supports it,
1 is supported on each arm 5, and each guide plate 22 is attached to each arm 5 so that the magnet 24 is attracted to each arm 5 along the facing surface 5 a of each arm 5. At this time, since each guide plate 22 is connected by the connecting member 23, the guide plates 22 rotate in opposite directions at an equal angle from a state parallel to each other. As a result, each guide plate 22 is attracted to a predetermined position along the opposing surface without shifting from the opposing surface of each arm 5. For this reason, the mounting portion 25 is reliably positioned at the fixed position of the arm 5, and the measuring point can be set accurately at the fixed position.

As described above, it is possible to safely and easily attach the antenna to the steel tower 1, and furthermore, the distance between the observation points A and B and the observation points and the observation points A and B and the two observation points by the lightwave measuring device 7. Angle can be measured more precisely. The surveying instrument mounting device 20 enables the surveying target instrument 10 to be attached to the steel tower 1 using the work rod 6 even when the steel tower 1 does not include the load suspending plate 3, and thus does not cause a work power failure. Allows surveying between the wire support points 2.

[0038]

According to the surveying target instrument, surveying instrument mounting apparatus and tower surveying method according to the present invention, a target can be safely and easily attached to a tower, and surveying between wire support points can be performed without a power outage. To

[Brief description of the drawings]

1A is a front view, FIG. 1B is a plan view, and FIG. 1C is a right side view of a survey target instrument according to an embodiment of the present invention.

2A is a front view, FIG. 2B is a plan view, and FIG. 2C is a right side view of the surveying instrument mounting apparatus according to the embodiment of the present invention.

FIG. 3 is a front view showing a target of the survey target instrument of FIG. 1;

4A is a front view and FIG. 4B is a plan view showing a state in which the survey target device of FIG. 1 is attached to a steel tower.

5A is a front view and FIG. 5B is a plan view showing a state in which the surveying instrument mounting device of FIG. 2 is mounted on a steel tower.

FIG. 6 is an explanatory diagram of a tower surveying method according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power transmission tower 2 Wire support point 3 Loading plate 4 Through hole 5 Arm 10 Surveying target instrument 11 Base 12 Insertion section 13 Holding member 14 Target 15 Magnet 20 Surveying instrument mounting device 21 Substrate 22 Guide plate 23 Connecting member 24 Magnet 25 Mounting part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsunori Watanabe 3-7-1, Ichibancho, Aoba-ku, Sendai, Miyagi Prefecture Tohoku Electric Power Co., Inc. (72) Toru Echigoya Ichibancho, Aoba-ku, Sendai, Miyagi Prefecture 3-7-1, Tohoku Electric Power Co., Inc. (72) Inventor Hiroki Sato 3-7-1, Ichibancho, Aoba-ku, Sendai, Miyagi Tohoku Electric Power Co., Inc. (72) Inventor Hiroshi Takahashi Aoba, Sendai, Miyagi 1-8-14 Kokubuncho, Ward Aikosha Sendai Branch Co., Ltd. (72) Inventor Akio Tateshita 8-14 Kokubuncho Aoba Ward, Sendai City, Miyagi Prefecture Aikosha Sendai Branch Co., Ltd. (72) Inventor Matsumoto Hiroyuki F-term (reference) 2F112 AD01 AD05 BA18 BA20 CA06 GA10 in Sendai Branch, Aikosha Co., Ltd. 1-8-14 Kokubuncho, Aoba-ku, Sendai, Miyagi Prefecture

Claims (6)

[Claims] 1. A surveying target instrument that can be attached to a load-suspension plate provided on a steel tower and made of an iron plate and having a through hole, comprising: a base, an insertion part, a holding member, a magnet, A base having a grip portion, the insertion portion having a diameter capable of being fitted into the through hole, being provided at the base portion, and the holding member having the insertion portion inserted into the through hole. When fitted, the load suspending plate is attached to the base so as to removably press an edge of the load suspending plate by elasticity, and the magnet fits the insertion portion into the through-hole, and engages the edge of the load suspending plate. The target is provided on the base so as to be attracted to the load suspending plate when pressed by the holding member, the target being provided on the base. Target device Utensils. 2. One end of each of two iron arms is joined,
What is claimed is: 1. A surveying instrument mounting device mountable on a steel tower having an electric wire supporting portion having the other end side opened, comprising: a substrate, two guide plates, a magnet, and a mounting portion. The magnet is provided on the outer surface of each guide plate in a state perpendicular to the mounting surface of the substrate, and the magnet is provided on the outer surface of each guide plate. A surveying instrument mounting device. 3. One end of each of two iron arms is joined,
A surveying instrument mounting device attachable to a steel tower having an electric wire supporting portion having the other end opened, comprising a substrate, two guide plates, a connecting member, a magnet, and a mounting portion, The guide plate is provided rotatably along the mounting surface in a state perpendicular to the mounting surface of the substrate, and the connecting member extends parallel to the mounting surface and is equidistant from the center of rotation of each guide plate in directions opposite to each other. The respective guide plates are rotatably attached to each guide plate at an interval allowing the guide plates to be arranged in parallel with each other, and the magnet is provided on an outer surface of each guide plate, and the attachment unit attaches a survey target device. A surveying instrument mounting device, wherein the surveying instrument mounting device is provided on the substrate as possible. 4. The survey target device according to claim 1, wherein the mounting portion has a mounting through hole, and the insertion portion is fitted into the mounting through hole, and the survey target device is mounted on the mounting target device. The surveying instrument mounting device according to claim 2 or 3, wherein the surveying instrument mounting device is attached to an attaching portion. 5. A surveying target instrument which can be attached to a load-suspension plate provided on a steel tower, which is made of an iron plate and has a through hole, comprising: a base, an insertion part, a holding member, a magnet, A target, the base has a gripper, the insertion part is provided on the base with a diameter that can be fitted in the through-hole, and the holding member connects the insertion part to the through-hole. When fitted, the load suspending plate is attached to the base so as to removably press an edge of the load suspending plate by elasticity, and the magnet fits the insertion portion into the through-hole to move an edge of the load suspending plate. The target is provided between the insertion portion of the base and the holding member so as to be attracted to the load suspending plate when pressed by the holding member, and the target is two survey target instruments provided on the base. Respectively, Serial insertion portion fitted in the through hole, an edge portion of the suspended load plate holding by the holding member, thereby adsorbing the magnet plate for hanging the load, 2
A light wave measuring instrument is installed at an observation point, and the modulated light wave emitted by the light wave measuring instrument is reflected by the target, and the reflected modulated light wave is received by the light wave measuring instrument. Measuring the distance between the observation point and each target and the angle between the observation point and each target by the lightwave measuring device, and determining the distance between each target from the distance and the angle. Tower surveying method. 6. One end of each of two iron arms is joined,
What is claimed is: 1. A surveying instrument mounting device mountable on a steel tower having an electric wire support portion having the other end side opened, comprising a substrate, two guide plates, a magnet, a mounting portion, and a target. The plate is provided rotatably along the mounting surface in a state perpendicular to the mounting surface of the substrate, the magnet is provided on an outer surface of each guide plate, the mounting portion is provided on the substrate, and the target is provided on the substrate. Each of the two surveying instrument mounting devices mounted on the mounting portion has the substrate supported on each arm, each guide plate along the facing surface of each arm,
The magnet is attached to two towers so as to be attracted to each arm, and a light wave measuring device is installed at an observation point. The modulated light wave emitted by the light wave measuring device is reflected by the target, and the modulated light wave reflected is reflected by the light wave. Light is received by a measuring instrument, and the distance between the observation point and each target and the angle between the observation point and each target are measured by the lightwave measuring instrument, and the distance between each target is determined from the distance and the angle. A tower surveying method characterized by the following.