JP2977486B2 - Tower tower mounting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower leg installation apparatus used for burying a tower leg supporting an overhead transmission line or the like in the ground.

[0002]

2. Description of the Related Art A tower supporting an overhead transmission line or the like has a considerable height in order to support a transmission line traveling at a considerable height from the ground. It is buried inside and hardened with concrete.

When burying a leg material in the ground, the center position of the tower is first determined at a predetermined position on the ground by surveying, and a burial hole is provided at a general position where the four leg members are buried with the center position of the tower as the center. Then, a leg material is installed in each buried hole.
The buried hole bottom is hardened with concrete, or if the hole bottom is hard ground, the lower end flange of the leg material with flanges at the upper and lower ends is placed on the ground as it is, and generally the tower tower structure on the ground It is installed at a predetermined angle in accordance with.

[0004] Between the bottom of the buried hole and the bottom flange of the leg material,
Adjust the vertical direction by inserting a small hydraulic jack or the like, and pry or hit the lower end flange with a crowbar in the horizontal direction, or push and pull the area immediately below the upper end flange with a rod, and then adjust the legs. Surround the whole material with reinforcement and pour concrete to harden the whole.

[0005] The installation of such steel tower legs is performed in the vertical direction.
Adjustments such as horizontal direction and tilt are all performed manually. After adjusting the vertical direction with a hydraulic jack, remove the hydraulic jack after adjustment, install reinforcement, and pour concrete, so the final product is
The dimensions may be slightly out of order. However, the installation of the legs is adjusted with millimeter accuracy, so slight deviations are not allowed.

For this reason, it is necessary to disassemble the reinforcing bars again or to push in the hydraulic jack, but the gap between the leg material and the upper end reinforcing bars is about 70 to 100 cm, and the gap between the burial holes is also human. Is not enough to penetrate, and it is not easy to perform these operations from a narrow gap. An apparatus disclosed in Japanese Patent Application No. 6-223073 is an invention which enables such operations to be performed without manual operation.

In this apparatus, a mechanical moving mechanism is provided on a fixed base placed on the bottom of the buried hole, which allows any one of horizontal, vertical, and rotational movements independently or a combination thereof. The lower end of the tower leg material is mounted on the upper surface of the moving base attached to the moving mechanism, and only the power transmission operation of the moving mechanism is performed manually or driven by a motor.

[0008] With this device, the installation and adjustment work of the leg material is performed mechanically, so that there is no need for the operator to enter the narrow burial hole and perform the adjustment operation manually, and only the power transmission operation from the ground is performed. Since it is good, it is possible to realize accurate installation work while saving labor.

[0009]

However, in the above-mentioned installation apparatus, a gear mechanism is frequently used as an input mechanism to the power transmission shaft of the movement adjusting mechanism of the moving base, and the gear which is a precision mechanical element is different from other gears. It is very expensive compared to general mechanical elements, and is heavy and difficult to handle.

In addition, when the concrete is finally poured into the steel tower leg material embedding hole, the installation device is embedded in the mounting hole together with the steel tower leg material. Since the shape and the entire peripheral mechanical element engaging with it have a complicated shape, concrete does not easily spread to the voids formed by them, and nests tend to remain on hardened concrete. This is a major problem in strength.

[0011] Accordingly, an object of the present invention is to provide a tower base member installation apparatus as described above, in which a moving mechanism of a moving base on which the tower base member is installed is simply configured. The purpose is to make the apparatus not to use high mechanical elements.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a tower leg material installation apparatus according to the present invention has a jack mechanism formed of parallel links, and the jack mechanism is configured such that the link has a fulcrum. It is pushed and pulled around by a feed screw mechanism, and moves up and down by rotating around a fulcrum. The jack mechanism is provided with a fixed shaft perpendicular to the mounting surface thereof,
A rotary plate that is rotatable around the fixed axis is inserted into the fixed shaft, and the rotary plate is pushed and pulled by a feed screw mechanism to rotate, and is mounted on the upper surface of the rotary plate. Is provided with a first slide plate which is pushed and pulled by a feed screw mechanism and is slidable with the plate surface parallel to the rotating plate, and the upper surface of the first slide plate is pushed by the feed screw mechanism. Is pulled, the plate surface is made parallel to the first slide plate, and
A second slide plate slidable in a direction perpendicular to the slide direction of the first slide plate is provided, and the lower end of the tower leg material is installed on the upper surface of the second slide plate to support it. .

According to the above construction, the position adjustment of the second slide plate on which the lower end of the tower leg member is installed in all directions (vertical direction, directions around points in a horizontal plane, and directions orthogonal to each other) is performed by the feed screw. It can be realized only by operating the mechanism.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The installation device A of the embodiment in FIG.
The jack mechanism J for adjusting the position in the vertical direction supports the rotary plate R, the slide frame Y, and the slide plate X for position adjustment in the horizontal plane. When adjusting the position of the legs,
The jack mechanism J is placed on a base in a leg material embedding hole not shown, and the lower end of a steel tower leg material not shown is mounted on the upper surface of the slide plate X.

Then, the slide plate X moves vertically by raising and lowering the lower jack mechanism J, rotates around a point in the horizontal plane by the rotation of the rotation plate R, and moves in the horizontal plane by the movement of the slide frame Y. To move linearly, and the slide frame itself
The upper leg is moved in a direction orthogonal to the moving direction of the slide frame Y, and the position of the leg member is adjusted. Hereinafter, the device A
A mechanism for performing the movement in each direction will be described.

(1) Vertical Position Adjustment Mechanism Vertical position adjustment is performed by a jack mechanism J shown in FIGS. In this jack mechanism J, three rectangular frames of an upper frame 1, a middle frame 2, and a lower frame 3 are arranged in parallel in the vertical direction, and are connected by large and small links 4,..., 51,. _L is formed.

Each of the upper frame 1 and the lower frame 3 is formed in a rectangular shape by welding an L-shaped steel, and a pair of opposing sides 15 and
Shaft holes 1 at predetermined pitches on the sides of 15, 35, 35
6,... Are provided.

At the center of the surface of the upper frame 1, a beam 11 passing through this position
A fixed shaft 12 is vertically welded to the upper surface of the shaft, and a rotating plate R described later is inserted into the fixed shaft 12.

A nut 31 is welded to a horizontal portion of a pair of opposite sides 35, 35 of the lower frame 3, and a nut 32 is inserted through a bore 32 provided at the center of the nut 31.
The bolt 33 to be screwed into is inserted. This bolt 3
Numeral 3 is for raising the level of the apparatus A when the apparatus A is installed on a base as described later.

The middle frame 2 has a rectangular shape, one of its short sides is formed by a pipe 21, the other is a solid square member 22, and both long sides are formed by a strip-shaped steel plate 23, and are fixed by welding. In the middle frame 2, another pipe 24 is provided in parallel with the short side pipe 21 at a distance equal to the hole pitch of the shaft holes 16, 36. ing. On the long side surface, a shaft hole 2 having the same diameter as the pipe hole is formed continuously with the pipe holes of the pipes 21 and 24.
6 are provided penetrating therethrough.

A screw hole 28 extends in the longitudinal direction of the middle frame 2 along a plane parallel to the middle frame 2 through the center of the solid square member 22.
Are provided through.

For each of the frames 1, 3 and 2 having the above-described shapes, the upper frame 1 and the lower frame 3 have respective shaft holes 1.
6 and 36, and for the middle frame 2, a link shaft 25 longer than the width of the frame is inserted into the two pipes 21 and 24, respectively. 51, 52 ... are attached.

One end of large links 4, 4 of equal length is attached to the mounting positions of the small links 51, 51 on both sides of the upper and lower frames 1, 3 on the side of the solid square member 22, respectively. The other ends of the pipes 4 and 4 are attached to projecting shafts at both ends of a square pipe 27 disposed on the extension surface of the middle frame 2 in the width direction of the frame. Thus, the entire parallel link J _L is formed. The parallel link J _L is raised and lowered by the feed screw mechanism S _J , and then the feed screw mechanism S of the parallel link J _L is
_J will be described.

At the center of the square pipe 27, there is provided a through hole 29 along the longitudinal direction of the inner frame 2, and a slicing bolt B screwed into a screw hole 28 provided in the solid square member 22.
_J is inserted through the screw hole 28 and the bore hole 29, and both ends protrude from the solid square member 22 side and the square pipe 27 side.

The stop for missing (and stopper for this Zungiri bolt B is the square pipe 27 side of the projecting end of the _J being welded Zungiri bolt operating nut N _J1, solid square bar 22 side of the projecting end ) Nut N _J3 is welded. A nut N _J2 for stopper is welded to the operation nut N _J1 side with the square pipe 27 interposed therebetween, and the square pipe 27 is restrained in the length direction of the cut bolt B _J by both nuts N _J1 and N _J2. ing. Further, a nut N _J2 for the stopper is provided between the solid square member 22 and the square pipe 27 of the trimming bolt B _J.
Apart from this, a nut N _J4 is welded to a position at a predetermined distance from the nut N _J3 .

The configuration of the parallel link J _L of the jack mechanism J and its feed screw mechanism S _J has been described above. To operate the same, the nut N _J1 for operating the cutting bolt of the feed screw mechanism S _J is operated. And turn the cutting bolt _BJ . Then, as shown in FIG. 4, the solid square member 22 and the square pipe 27 come close to each other due to the feed screw action between the screw hole 28 of the solid square member 22 of the middle frame 2 and the cutting bolt _BJ. It is far away, and the solid timber 2 is through the large links 4 and 4.
The small links 51 on the second side rotate about the link shaft 25. Thus, the parallel link J _L is contoured as indicated by two-dot chain lines in FIG., The upper frame 1 is raised and lowered relative to the lower frame 3. Thus, vertical position adjustment can be performed. In this case, when the parallel link J _L occurs most, the nut N _J4
Abuts against the side surface of the solid square member 22, and the nut N _J3 comes into contact with the side surface of the solid square member 22 when the parallel link J _L is most down. Both nuts N _J4 and N _J3 are
It serves as a stopper at both ends of the lifting stroke of jack J.

(2) Angle Adjusting Mechanism by Rotation about a Point in a Horizontal Plane As shown in FIG. 5, the fixed shaft 12 of the jack mechanism J has a rectangular rotating plate R at the center of its surface. The rotation hole 81 is inserted, and the lower surface thereof is in contact with the upper surface of the upper frame 1 of the jack mechanism J so as to be rotatable around the fixed shaft 12 thereof. Rotation (angle adjustment) around a point in a horizontal plane is performed by rotating the rotation plate R. The upper surface of the beam of the upper frame 1 on which the fixed shaft 12 is provided is lower than the upper surface of the upper frame 1, and the rotating plate R does not contact the upper surface of the beam 11, And rotate only in contact with.

Four holes H _R ... Provided in the rotating plate R are installed in the buried hole and then, when the device is solidified with concrete, air flowing in at the time of pouring the concrete together with the rotating plate R is used. This is a relief hole so that it does not stay below.

The rotation of the rotation plate R is performed by a feed screw mechanism S _R provided on the jack mechanism J.
For feed screw mechanism S _R of the rotating plate R will be described.

As shown in FIG. 6, a screw holder 73 made of a strip-like steel plate extending in the horizontal direction is provided at an end of the side plate of the upper frame 1 of the jack mechanism J, and a spacer 82 is also provided on the lower surface of the rotating plate R. There is provided a screw holder 83 made of a strip-shaped steel plate extending horizontally in the middle. As shown in FIG. 7, pin holes 74 and 84 are provided on the protrusions of the two screw holders 73 and 83 from the side surface of the slide frame Y, and the rotation holes 75 and 85 are provided in the pin holes 74 and 84, respectively. The pin portions of the screw receivers 76 and 86 provided on the edges are loosely fitted, and the screw receivers 76 and 86
86 is provided vertically on the screw holders 73 and 83.
Pins 75 and 85 of both screw receivers 76 and 86 are screw holder 7
Washer W _R of the protruded lower end stopper is welded from 3,83.

The screw holder 86 of the screw holder 83 on the rotating plate side is provided with a screw hole 87 substantially at the center of the plate surface.
A screw hole 76 having a diameter larger than the root diameter of the screw hole 87 is provided in the screw receiver 76 of the screw holder 73 on the jack upper frame 1 side. The piercer over the hole 77 in the screw holes 87, are inserted Zungiri bolts B _R screwed into the screw hole 87, the end portion of the screw receiving 76 side of the Zungiri bolt B _R is
The nut N _R1 for operating the trimming bolt and the nut N _R2 for the stopper are located on both sides of the screw receiver 76 (see FIG. 8).
Is welded.

The above is the structure of the feed screw mechanism S _R of the rotary plate R, a Zungiri bolt B _R by operating the Zungiri bolt operating nut N _R1 to rotate the rotary plate R Rotate. Then, as shown in FIG. 8, by a feed screw action of the screw holes 87 and Zungiri bolt B _R of the turning plate side screw receiving 86, since screw receiving 86 moves forward and backward on Zungiri bolt B _R, receive the screw The rotation plate R rotates around the fixed shaft 12 via the rotation plate-side screw holder 83 to which the 86 is attached. At this time, the pin holes 74 of both screw holders 73 and 83,
And a screw receiver 7 inserted into the pin holes 74, 84 thereof.
The pivot pin 75 and 85 of 6,86, since the loosely fitted state as described above, even if the screw receiving 86 to linear movement on Zungiri bolt B _R, the direction (rotation perpendicular to the direction In the radial direction of the trajectory), the rotation pins 75 and 85
4, 84, and the rotating plate R smoothly rotates.

In order to rotate the rotating plate R smoothly, the following points are adjusted at the time of assembling the apparatus. The diameter of the pin holes 74, 84 and the pin holes 74, 84
The horizontal positional relationship between the two screw holders 73 and 83 provided with the holes is processed and corrected at the present time, and the loosely fitted state of the rotating pins 75 and 85 and the pin holes 74 and 84 is adjusted.

The center of the hole 77 of the screw holder 76 on the jack upper frame 1 side and the center of the screw hole 87 of the screw holder 86 on the rotating plate side are reference surfaces (for example, the upper surface of the back plate 35 of the lower frame 3 of the jack mechanism J). The vertical mounting of the screw holders 73, 83 on the jack upper frame side and the rotating plate side is carried out by correcting the height dimension of the spacer 82 of the rotating plate side screw holder 83 so that they are at the same height from each other. .

(3) Position adjustment mechanism for linear movement in two directions orthogonal to each other in a horizontal plane In this embodiment, linear movement in one of the two directions is
As shown in FIG. 9, the slide frame Y fitted on the rotating plate R is slid with respect to the rotating plate R.

The slide frame Y is formed by forming four L-shaped steels 61, 61, 62, 62 having the same cross-sectional dimensions and shape in a rectangular frame, and another pair of opposing sides 61, 61 at opposite ends. The ends of the opposite sides 62, 62 are shaped to ride on. The inside of the frame is made of L-shaped steel as shown in FIG.
A horizontal back plate 61a of a pair of opposite sides 61, 61 of an L-shaped steel
Is fitted into the side edge of the rotating plate R, and the opposite side 62,
The sliding frame Y and the rotating plate R are supported by the rotating plate R so that the sliding frame 62 rides on the edge of the rotating plate R. The side surface of the back plate 61a and the side edge of the rotating plate R serve as sliding surfaces for each other. , Can slide with each other. The slide frame Y is is slid by a feed screw mechanism S _Y relative rotation plate R, will now be described the feed screw mechanism S _Y.

The feed screw mechanism S _Y is, as shown in FIG.
The screw holder 80 has a steel plate projecting from the lower surface of the rotating plate R, and the surface of the screw holder 80 is perpendicular to the sliding direction of the slide frame Y. A drilled hole 80a is provided at substantially the center of the plate surface of the screw holder 80.
The slide frame Y side plate, which is parallel to, is provided with a cutout 69 having the same size as the cutout 80a on a straight line parallel to the sliding direction of the rotating plate R through the cutout 80a.

On the outer surface of the hole 69 of the slide frame Y side plate, the center of the hole 69 is made equal to that of the
A nut N _Y0 smaller than a diameter of 9 is welded, and a slicing bolt _BY to be screwed with the nut N _Y0 is inserted over a bore 80 a of the screw holder 80 and a bore 69 of the slide frame Y. .

Both ends of the trimming bolt _BY protrude from the screw holder 80 and the plate nut N _{Y0 on the} slide frame Y side, and a nut N _Y1 for bolt operation is welded to an end of the nut N _Y0 side. A nut N _Y3 for retaining is welded to the portion. Further, on the outer surface of the screw holder 80 of the trimming bolt _BY , the nut N for retaining
The nut N _Y2 for the stopper is welded at an installation interval that gently sandwiches the screw holder 80 together with _{Y 3} .

The above is the description of the feed screw mechanism S _Y of the slide frame _Y.
, And the to slide the slide frame Y rotates the Zungiri bolt B _Y through the operating nut N _Y1.
Then, the slide frame Y slides along the side edge of the rotating plate R in the direction of the arrow y in the figure by the feed screw action of the trimming bolt _BY and the nut N _Y0 of the slide frame Y side plate screwed thereto.

Next, a description will be given of a mechanism for adjusting the position of the slide frame Y in a direction orthogonal to the sliding direction. Position adjustment in this direction is performed by moving a slide plate X fitted into a slide frame Y, as shown in FIG. As described above, the slide frame Y is assembled in such a manner that another set of opposite sides 62, 62 has an end portion of the back plate 62a on one end of the opposite side plate 61a, 61a. , FIG.
As shown in FIG. 1, at the step portion corresponding to the thickness of the back plate 62a,
A slide plate X of a rectangular steel plate having a width dimension equal to the width dimension of the planar rectangular shape of the step portion is fitted. The lower surface of the slide plate X includes the upper surface of the rotating plate R and the back plates 61a, 61.
a, and is slidable along the side surface of the back plate 62a. Pressing plates 63 are welded to upper surfaces of both end portions of both back plates 62a, 62a so as to partially project inward of the frame, and the slide plate X is connected to the back plate 62a.
It does not protrude from the top.

A hole H provided at the center of the surface of the slide plate X
_C is a rotating fixed shaft 12 of the rotating plate R below it.
A relief holes, the hole H _X ... is provided at the four sides of the face, as in the case of the rotating plate R, a hole to allow air to escape coming flow together when the concrete injected at the time of the device embedded in the . The slide plate X is pulling has been slid press the slide frame feed provided on a side surface of the Y screw mechanism S _X.

The feed screw mechanism S _X bolt holder 64 arched provided on the side surface of the slide frame Y, the slide plate X
L-shaped screw plate 9 protruding from the side edge on the upper surface of
1, and it is constituted by Zungiri bolt B _X.

The beam plate 64a of the bolt holder 64 and the vertical portion 91a of the screw plate 91 are both parallel to the side surface of the slide frame Y.
4a, the vertical portion 91a of the screw plate 91 and the slide frame Y side plate are provided with a cutting hole 65, a screw hole 92, and a cutting hole 66 in this order on a straight line parallel to the sliding direction of the slide plate X. The two holes 65, 66 have a diameter larger than the root dimension of the screw hole 92, and these three holes 65, 92, 66
Over and in Zungiri bolt B _X screwed into the screw hole 92 of the screw plate 91 is inserted, both ends protrude respectively beam plate 64a, a slide frame Y side plate.

[0045] The Zungiri at both ends of the bolt B _X is missing a bolt operating nut N _X1 with each beam plate 64a outer surface and the slide frame interval, such as loosely sandwich the side plate inner surface of Y of the bolt holder 64 The nut N _X3 for stopping is welded.

To slide the slide plate X, the nut N _X1 for bolt operation is rotated. Then, the vertical portion 91a of the screw plate 91 moving on Zungiri bolt B _X by the feed screw action of the screw holes 92 of Zungiri bolt B _X and the screw plate 91, slide plate X which screw plate 91 is welded Slide in the direction of arrow x in the figure.

The apparatus A of this embodiment is configured as described above, and adjusts the vertical position of the base (the slide plate X) on which the steel tower legs are placed, rotates around a point in a horizontal plane, and All of the position adjustments in the directions orthogonal to each other are performed by the cutting bolt B of the feed screw mechanism provided in each adjustment mechanism.
_J, B _R, B _Y, can only easily achieved pivots B _X. Therefore, this device A is provided with each of the cut bolts B _J , B _R ,
B _Y, but the B _X can be operated manually using a wrench, Zungiri bolt _{B J, B R, B Y} , operating nut B _X N _J1,
A small motor may be connected to N _R1 , N _Y1 , N _X1 and operated electrically. Next, the installation work of the tower leg material using the device A will be described.

First, as shown in FIG. 12, the installation device A is installed on the base T in the steel tower leg material embedding hole Q, a level is applied, and the horizontal indexing bolt 33 of the jack mechanism lower frame 3 is turned. To make the device A level.

Next, the leg material P for the steel tower is installed on the slide plate X of the device A in a horizontal position while being inclined at a predetermined angle. At this time, the approximate position of the leg material P is set to a predetermined position and near an angle by visual inspection of an operator, but the installation state of the leg material P is accurately adjusted to the support of the steel tower on the upper part and the millimeter unit. Need to connect.

Therefore, the supporter S of the leg material P is adjusted by pushing and pulling by the adjusting mechanism D, and the fine adjustment of the horizontal, vertical movement and rotation at the lower position of the leg material P is performed according to the embodiment of the present invention. This is performed by the device A. The order of operation in each direction is arbitrary, and as described above, when the operation of the feed screw mechanism is performed electrically using a small electric motor, all operations can be performed simultaneously. The operation of the small motor M is adjusted by the control unit CT, and the adjustment is performed based on the position data and the inclination data by the control signal from the small personal computer C. Alternatively, the small motor M may be operated by a manual switch.

In this way, if the set center on the slide plate X on which the tower base member P is installed is determined by prior survey and coincides with the installation center of the tower base member P, concrete is poured into the burial hole Q, and the apparatus A is connected to the tower base. Material P is hardened with concrete.

As described above, in the installation apparatus A of this embodiment, all the movements in the respective directions for adjusting the position of the slide plate X (moving base) on which the steel tower leg material P is installed are all the feed screw mechanisms S _J and S. _R , S _Y , S _X bolt B _J ,
B _R, B _Y, a simple configuration can be realized only by the rotation of B _X.

Since the moving system is a sliding system, it is easy to move.

[0054]

As described above, according to the present invention,
Regarding the installation device of the tower leg material, the input of the movement operation in each direction (vertical direction, around the point in the horizontal plane and in the direction orthogonal to each other) of the movement base on which the leg material is installed, without using a complicated gear mechanism, Since all the operations are performed by the feed screw mechanism, the device has a very simple structure.

Since the structure of the device is simple, when the leg material whose position has been adjusted is poured into concrete and hardened by pouring it into the burying hole, the poured concrete easily spreads inside the device and the structure of the steel tower buried portion is strengthened. There are advantages.

Further, since the structure is simple, there is an advantage that processing is easy and manufacturing cost is easy, and it is suitable for mass production.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment.

FIG. 2 is a perspective view showing a jack mechanism.

FIG. 3 is an exploded perspective view of a jack mechanism.

FIG. 4 is a side view showing the movement of the jack mechanism.

FIG. 5 is an exploded perspective view showing the mounting of the rotating plate.

FIG. 6 is a perspective view showing a feed screw mechanism for rotating plate operation.

FIG. 7 is a perspective view of a main part of the above.

FIG. 8 is a plan view showing a state of rotation of a rotation plate.

FIG. 9 is a perspective view showing a slide frame and a slide plate.

FIG. 10 is a cross-sectional view taken along line II of FIG. 1 showing attachment of the slide frame to the rotating plate;

FIG. 11 is a sectional view taken along line II-II of FIG. 1, showing the mounting of the slide plate to the slide frame.

FIG. 12 is a view for explaining a leg material installation operation by the installation device of the embodiment.

[Explanation of symbols]

J jack mechanism 1 on frame 2 middle frame 3 lower frame J _L parallel link R rotary plate Y slide frame X slide plate _{S J, S R, S Y} , S X feed screw mechanism

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-272241 (JP, A) JP-A-61-192461 (JP, U) JP-A-2-26807 (JP, U) JP-A-5-272241 16400 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04H 12/00-12/10 E04H 12/22 E04G 21/14-21/18

Claims (1)

(57) [Claims] 1. A jack mechanism comprising a parallel link, wherein the link is pushed and pulled around a fulcrum by a feed screw mechanism, and is raised and lowered by rotating about the fulcrum. The jack mechanism is provided with a fixed shaft perpendicular to the mounting surface, and a rotary plate rotatable around the fixed shaft is inserted into the fixed shaft, and the rotary plate is fed. A first slide plate, which is pushed and pulled by a screw mechanism and turns, is provided on the upper surface of the turn plate and is slidable by a feed screw mechanism and which can slide with the plate surface parallel to the turn plate. The upper surface of the first slide plate is pushed and pulled by a feed screw mechanism so that the plate surface is parallel to the first slide plate and slidable in a direction perpendicular to the slide direction of the first slide plate. The second slide plate that became Vignetting, mounting the tower leg members lower end to the upper surface of the second sliding plate, tower leg member mounting apparatus designed to support.