KR101541044B1 - Gondola for post-tension construction - Google Patents

Abstract

The present invention relates to a gondola for post-tension construction. The gondola for post-tension construction includes: a working table (31) which can move along the external wall (10) of a storage tank where a steel wire (15) is installed for post tension; an elevating unit (51) which elevates the working table (21) along the external wall (10) of the storage tank; and an interference preventing unit (27) which prevents interference between the working table (21) and the steel wire (15) when the working table (21) moves along the external wall (10) of the storage tank. The present invention secures the safety of workers in a post tension process on the external wall of the storage tank, improves workability, saves costs, and reduces construction time.

Description

[0001] GONDOLA FOR POST-TENSION CONSTRUCTION [0002]

The present invention relates to a gondola for post-tensioning work, and more particularly to a gondola for post-tensioning work for post-tensioning a wall post during civil engineering work for constructing an LNG storage tank.

LNG storage tanks are equipped with post tension (POST TENSION) using a steel wire so that the wall can support itself after the construction of the concrete wall.

The post tension is a method of applying a prestress to the concrete wall 1. The post tension is a method of placing the concrete outside the sheath 3 after arranging the sheath 3 and inserting the PC steel wire into the sheath 3 after the concrete is cured, It is a method of tensioning, fixing by using fixtures, and introducing tensile stress by injecting cement grout.

As shown in FIG. 1, post-tensioning work of the wall 1 of the LNG storage tank is carried out by using a scaffold 5 and a scaffold 7. The frame scaffold (3) means a scaffold built by intertwining or entangling a unit of a steel pipe having a predetermined frame in advance at the factory.

However, due to the nature of the shape of the frame scaffold 5, unstable behaviors of the operator frequently occur, and there is a risk of falling and stenosis. Since the heavy scaffold 5 must pass and convey heavy materials inside the frame scaffold 5, As the height increases, a huge structure must be installed and disassembled, which leads to an increase in cost.

In addition, there is a risk that the worker is likely to slip on the steel pipe constituting the framework 5, so that the use thereof is limited at the time of rainy weather and the risk of fall and stenosis is still present even if the fall prevention network is installed.

It is an object of the present invention to provide a method and an apparatus for preventing falling and falling of a worker, ensuring safety of workers, facilitating handling of materials, ensuring a sufficient working space and being installed at all heights, And to provide a gondola for wall post tensioning of the LNG storage tank.

According to an aspect of the present invention for achieving the above-mentioned object, the present invention provides a method of manufacturing a post-tensioning machine, comprising: a workbench installed up and down along an outer wall of a storage tank provided with a steel wire for post tension; And an interference preventing means for preventing interference between the work table and the steel wire when the work table ascends and descends along the outer wall of the storage tank.

The work table includes a foot plate formed by assembling a plurality of plates so as to have a surface corresponding to an outer wall of the storage tank, and a balustrade frame assembled to the foot plate to prevent an operator from falling.

The lifting and lowering means includes a plurality of wire ropes extending in the height direction of the outer wall of the storage tank, a winder installed on the railing frame and connected to the wire rope, A safety block for stopping the driving of the winder, and a control unit connected to the power source to control driving of the winder.

The workbench is provided with an overload detection sensor. When the load sensed by the overload detection sensor is equal to or greater than a set load, the control unit stops the operation of the winder or generates an alarm.

The workbench includes a leveling means for manually leveling the workbench when the workbench is not level.

Wherein the wire rope is a two-row wire rope having one side hooked to an upper support provided on an upper surface of the storage tank and the other hooked to a lower support installed on a lower surface of the storage tank, When the rope is raised to the top, the other rope is pulled down and turned one turn, or the winder is raised or lowered on the wire rope.

Wherein the interference preventing means comprises a slide plate inserted into a bottom surface of the foot plate and assembled to be drawable by the drawing means, a slide frame which is slidably assembled to the parapet frame and forms a railing of the foot plate, And a folding frame which is foldably assembled to the railing frame and forms a railing of the footrest at a portion where the slide plate is drawn out.

And an anti-collision sensor for detecting proximity of the steel wire to the upper surface and the lower surface of the slide plate.

The drawing means includes a fixed rail provided at a lower portion of the scaffold, a guide rail provided at a bottom surface of the slide plate to move along the fixed rail, and a guide rail for pushing the slide plate to move the slide plate along the fixed rail. Cylinder and rod.

And a support means provided at one side of the workbench and supporting the workbench by contact with an outer wall of the storage tank.

The present invention can optimize the installation of the gondola on the outer wall of the storage tank and maximize the work space of the worker, so that the work radius can be enlarged so that various works can be performed, and the cost and gondola installation time can be shortened .

Further, the present invention is advantageous in post-tensioning work at various positions on the outer wall of the storage tank, handling of materials, easy movement and setting of equipment, less influence on weather and high work efficiency.

In addition, since the construction of the post tension can be performed regardless of the height of the gondola, the present invention has an advantage that the construction period can be shortened.

Therefore, the present invention can secure the safety of the operator at the post-tensioning work on the outer wall of the storage tank, increase the work efficiency, and shorten the construction period.

FIG. 1 is a view showing a state in which a beetle and a footrest are installed for post tensioning of a wall of a storage tank. FIG.
2 is a view showing a gondola for a post tension work installed on a concrete wall of a storage tank according to an embodiment of the present invention.
3 is a view showing a state before a workbench is assembled according to an embodiment of the present invention.
4 is a view showing the principle of preventing interference between a working table and a steel wire when a work table is lifted and lowered along an outer wall of a storage tank according to an embodiment of the present invention.
5 is a side view showing a work table according to an embodiment of the present invention.
6 is a side view showing a state in which a post-tension gondola is installed on a concrete wall of a storage tank according to an embodiment of the present invention.
7 is a view showing a post-tensioning operation on an outer wall of a storage tank using a post-tension gondola according to an embodiment of the present invention;
8 is a block diagram illustrating a method of operation of an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2, the post-tension gondola 20 includes a work table 21 installed up and down along the outer wall 10 of the storage tank, and a work table 21 And includes an ascending / descending means (51).

The work table 21 includes a foot plate 23 and a railing frame 25. The foot plate 23 is formed by assembling a plurality of plates so as to have a surface corresponding to the outer wall 10 of the storage tank. The railing frame (25) is assembled to the foot plate (23) to prevent an operator from falling.

The storage tank is an LNG storage tank and the outer wall 10 is made of concrete. The storage tank has a vertically elongated protrusion 11 formed on the outer wall 10 and a sheath 13 for post tension is provided on the protrusion 11. [ The sheath 13 is a tube tube previously arranged before pouring the concrete for forming the outer wall 10 to make the arrangement hole of the steel wire 15. [

In this embodiment, the sheath 13 is exposed externally along both sides of the protrusion 11 so that POST TENSION using the steel wire 15 can be performed. It is possible to introduce a tensile stress to the outer wall 10 of the storage tank by inserting the steel wire 15 into the sheath 13, tightening it, and fixing it by using a fixing hole.

3, the foot plate 23 can be formed by assembling three plates of a first foot plate 23a, a second foot plate 23b, and a third foot plate 23c.

The second footrest 23b and the third footrest 23c can be assembled to both sides of the first footrest 23a by brackets or the like. The length of the first foot 23a corresponds to the front width of the protrusion 11 and the width of the second foot 23b and the third foot 23c is further extended by the width of the protrusion 11 protruding, 11, respectively.

When the second footplate 23b and the third footplate 23c are assembled to the first footplate 23a, the shape of the footplate 23 facing the storage tank may correspond to the outer wall 10 of the storage tank. The worker can smoothly perform the work of inserting the steel wire 15 into the sheath 13 formed on both side surfaces of the projecting portion 11 while moving left and right at the foot plate 23. [

The railing frame 25 is assembled to the foot plate 23 to prevent the operator from falling. A plurality of railing frames (25) are assembled along the edges of the footrest (23) except for the portions corresponding to both sides of the protruding portion (11) to form railings on the footrest (23).

The parapet frame 25 includes a first parapet 25a to a fourth parapet 25d covering the front of the foot plate and a fifth parapet frame 25a covering the left side of the foot 23 in a double- A seventh parapet frame 25g and an eighth parapet frame 25h which cover the right side of the foot plate and a seventh parapet frame 25h covering the rear side of the foot plate 23, (25i) to a twelfth guardrail frame (25l).

The outer wall 10 of the storage tank can prevent the worker from falling down even if there is no handrail, at the portion of the foot plate 23 corresponding to both sides of the protrusion 11. Since the sheath 13 for inserting the steel wire 15 is exposed at the portion of the foot plate 23 corresponding to both sides of the projecting portion 11, the guardrail frame 25 is provided to prevent interference with the pre- Do not assemble. The railing frame 25 can be assembled and fixed firmly to the foot plate 23 using a bracket or the like.

And an interference preventing means (27) for preventing the work table from interfering with the steel wire (15) during the lifting and lowering work along the outer wall (10) of the storage tank.

3 and 4, the interference preventing means 27 includes slide plates 28 and 29, slide frames 33 and 35, and folding frames 37 and 38.

The slide plates 28 and 29 are provided on the second foot plate 23b and the third foot plate 23c, respectively. The slide plates 28 and 29 are inserted into the bottom surfaces of the second foot plate 23b and the third foot plate 23c respectively and are assembled so as to be drawn out by the drawing means 41. [

When the slide plates 28 and 29 are drawn out from the bottom surfaces of the second foot plate 23b and the third foot plate 23c, the slide plates 28 and 29 are brought into contact with both side surfaces of the protruding portion 11 so that the foot plate 23 corresponds to the outer wall 10 of the storage tank And a space 39 is formed between both side surfaces of the protrusion 11 and the foot plate 23 when inserted into the bottom surface of the second foot plate 23b and the third foot plate 23c. The spacing space 39 serves to prevent interference between the work table 21 and the steel wire 15 when the work table 21 ascends and descends.

5, the drawing means 41 includes a fixed rail 43 provided at the bottom of the second scaffold 23b and the third scaffold 23c, and a fixed rail 43 provided at the bottom of the slide plates 28, And a guide rail 45 installed therein. The slide plates 28 and 29 are disposed between the foot plate 23 and the fixed rail 43 and the guide rail 45 is moved along the fixed rail 43 to move the second foot plate 23b and the third foot plate 23c, Respectively.

The drawing means 41 further includes a rod 49 into which the cylinder 47 and the cylinder 47 can enter and exit and whose ends are fixed to the slide plates 28 and 29. The slide plates 28 and 29 can be inserted into or withdrawn from the bottom surfaces of the second foot plate 23b and the third foot plate 23c by the operation of the rod 49 which is introduced into and withdrawn from the cylinder 47. [

The slide plates 28 and 29 are provided with a locking part 31 protruding downward at an end thereof and the locking part 31 is hooked by the end of the locking rail 43 to restrict the movement thereof, As shown in FIG.

In another embodiment, although not shown, the slide plates 28 and 29 are provided with wheels which can be moved along the fixed rail 43 on the bottom surface, and the wheels of the slide plates 28 and 29 are fitted into the fixed rail 43 .

The slide frames 33 and 35 are slidably assembled to the railing frame 25 to form the railing of the foot plate 23 at the portions where the slide plates 28 and 29 are drawn out. When the slide frames 33 and 35 are inserted into the bottom surface of the second scaffold 23b or the bottom surface of the third scaffold 23c, respectively, the slide frames 33 and 35 are overlapped on the railing frame 25, (23b) or the third footrest (23c).

The folding frames 37 and 38 are foldably assembled to the railing frame 25 to form railings of the footrest 23 at the portions where the slide plates 28 and 29 are drawn out. The folding frames 37 and 38 are overlapped on the railing frame 25 and when the slide frames 33 and 35 are inserted into the bottom surface of the second scaffold 23b or the bottom surface of the third scaffold 23c, So as to form the railing of the second scaffold 23b or the third scaffold 23c.

In this embodiment, the slide frames 33 and 35 are superimposed on the 10th guardrail frame 25 and the 11th guardrail frame 25, respectively. The slide frames 33 and 35 extend in the direction of the ninth guardrail frame 25i and the 12th guardrail frame 25l And the folding frames 37 and 38 are respectively folded in the ninth parapet frame 25i and the twelfth parapet frame 25l and then rotated in the direction of 90 degrees so that the slide plates 28 and 29 slide And forms a guardrail between the second footrest 23b and the third footrest 23c.

The slide frames 33 and 35 can be connected to the railing frame 25 in a rail manner and the folding frames 37 and 38 can be connected to the railing frame 25 using a hinge. The slide frames 33 and 35 and the railing frame 25 cooperate with each other to form a railing of the spacing space 39, thereby preventing an operator from falling down.

The lifting means 51 moves the work table 21 up and down along the outer wall 10 of the storage tank.

The lifting and lowering means 51 includes a plurality of wire ropes 53 extending in the height direction of the outer wall 10 of the storage tank, a winder disposed on the railing frame 25 and connected to the wire rope 53, And a control unit 65 connected to the power source so as to control driving of the further 55. [

The wire rope 53 is rotatably hooked on an upper support 69 provided on one side of the upper surface 67 of the storage tank and rotatably mounted on a lower support 71 provided on the lower side of the storage tank Is a two-line wire rope (53).

The wire rope (53) is pulled up by one side of the wire rope (55), and the other side of the wire rope (53) is pulled downward to make one turn or the winder (55)

As shown in Fig. 5, the winder 55 has a function of maintaining the frictional force generated between the rotary sheaves 55a and 55b rotated by a motor (not shown) and the wire rope 53, The work table 21 is raised and lowered in such a manner that one row is raised or lowered upward. The motor for operating the winder 55 may use a brake motor having an air gap.

The elevating and lowering means 51 further includes a safety block 57 installed on the railing frame 25 and connected to the wire rope 53. The safety block 57 is for preventing the work table 21 from falling down when the wire rope 53 is broken.

The safety block 57 passes both the wire rope 53 passing through the winder 55 and the auxiliary wire (not shown) so that when the work table 21 is suspended in the air, it does not catch the auxiliary wire, 53 is accidentally disconnected, the auxiliary wire can be instantaneously held to prevent the work table 21 from falling.

An overload detection sensor 59 is provided on the work table 21. The overload detection sensor 59 is installed in the railing frame 25 and when the load sensed by the overload detection sensor 59 is equal to or greater than the set load, the control unit 65 stops the operation of the winder 55, .

The overload detection sensor 59 may be a mechanical device using the principle that the tension of the wire rope 53 is proportional. The overload detection sensor 59 sends a signal to the control unit 65 in the event of an overload to cause the control unit 65 to cut off the power so as to stop the operation of the winder 55 or to generate an alarm to prevent an accident .

In this embodiment, the winder 55 and the safety block 57 are connected to one line of the wire rope 53, and the overload detection sensor 59 is connected to the other line.

Further, four wire ropes 53 are connected to the railing frame 25 on both sides in the longitudinal direction of the work table 21, two in each case. Specifically, each wire rope 53 is connected to a winder 55 provided on the railing frame 25 by a safety block 57 and an overload detection sensor 59 to provide a work table 21 to a working position Fix the length.

The winder 55, the safety block 57 and the overload detection sensor 59 are provided in total of four on the railed frame 25 on both sides so as to correspond to the number of the wire ropes 53.

The control unit 65 is provided in a control box disposed below the center of the foot plate 23 in the longitudinal direction. In FIG. 2, the control box is provided under the reference numeral 80. The control unit 65 drives the four winders 55 to raise and lower the work table 21 and adjust the level. The control unit 65 can supply power to drive the winder 55.

As shown in FIG. 8, the work table 21 may be provided with horizontal adjustment means 61. The leveling means 61 is a means for manually adjusting the horizontal position of the work table 21 when the level of the work table 21 does not match the rising and falling speeds of the winder 55 installed on both sides of the railing frame 25 will be.

The horizontal adjusting means 61 is provided between the two winders 55 of the two side railing frames 25 so that the worker 21 can be leveled by operating the winder 55 manually.

Further, the horizontal adjusting means 61 may be further provided in a control box disposed at a lower portion of the center of the foot plate 23 in the longitudinal direction.

The work table 21 may further include a collision avoidance sensor 63. A total of four anti-collision sensors 63 may be provided on the upper and lower portions of the slide plates 28 and 29, respectively. The anti-collision sensors 63 are installed to prevent the collision of the slide plates 28 and 29 with the steel wire 15 when the slide plates 28 and 29 are not inserted into the bottom surface of the foot plate.

The collision avoidance sensor 63 transmits a proximity signal to the control unit 65 when it is in proximity to the steel wire. The control unit 65 that has received the proximity signal of the collision avoidance sensor 63 can stop the rising and falling of the work table 21 to prevent the slide plates 28 and 29 from colliding with the steel wire 15. [

The control unit 65 receiving the proximity signal of the collision avoidance sensor 63 operates the cylinder 47 to insert the slide plates 28 and 29 into the bottom surface of the foot plate 23, And the steel wire 15 can be prevented from colliding with each other.

The workbench 21 may be provided with an abnormal stop switch 81 for preparing for an unexpected situation during operation and an automatic return switch 83 for returning to an automatic operation upon unexpected situation resolution.

6, the upper support 69 is protruded from the upper surface 67 of the storage tank so that one end thereof is fixed to the upper surface 67 of the storage tank by the bracket 73 and the other end thereof is horizontal to the ground surface. do. A hook portion 69a having a hole formed at the other end of the upper support 69 is formed and the wire rope 53 is hooked on the hook portion 69a.

The lower support 71 may be mounted on the ground or one end may be fixed to the outer wall 10 of the storage tank by a bracket 75. The lower support 71 also has a hook 71a corresponding to the hook 69a of the upper support so that the wire rope 53 can be hooked.

The wire rope 53 is lifted and lowered by the upper and lower support rods 69 and 71 and the wire rope 53 is lifted and lowered by the driving of the winder 55, The work table 21 can be raised and lowered.

A method in which the wire rope 53 is fixed to the upper support 69 and the lower support 71 and the worktable 21 is connected to the wire rope 53 via the winder 55, The work stability can be improved.

The upper support 69 and the lower support 71 may use a structural beam such as an H-beam.

It is preferable that one end of the upper support 69 is supported by the upper surface 67 of the storage tank and the other end of the upper support 69 is designed to be larger than three times the load supporting the worktable 21. The load at which one end of the upper support 69 is supported on the upper surface of the storage tank can be adjusted by the number of brackets 73 that fix one end of the upper support 69 to the upper surface 67 of the storage tank.

The overload detection sensor 59 detects an overload signal when the load at which the other end of the upper support 69 supports the work table becomes a set load so that the upper support 69 does not exceed the load supported by the upper surface 67 of the storage tank, (65).

In the present embodiment, the set load is designed to be 1000 kg to facilitate the movement of materials, personnel, and equipment.

Two upper support posts 69 are provided so as to be spaced apart from the upper surface of the storage tank. Each of the upper supports 69 is provided with a work plate 77 which can be easily lifted by the worker and can be easily attached to the wire rope 53 or the like.

A support means 79 for supporting the work table 21 by contact with the outer wall 10 of the storage tank is provided at one side of the work table 21. The supporting means 79 may be a roller member. The support means 79 serves to minimize the friction between the work table 21 and the outer wall 10 of the storage tank while the work table 21 is lifted and lowered.

Hereinafter, the operation of the present invention will be described.

A process of installing and operating the post-tensioning gondola on the outer wall of the storage tank will be described.

First, the first footrest 23a to the third footstep 23c and the first to ninth handrail frames 25a to 25l shown in Fig. 3 are assembled with brackets or the like to complete the worktable 21.

The assembled work table 21 is provided with a safety block 57, a winder 55 and an overload detection sensor 59 on the railed frame 25 on both sides and one line of the wire rope 53 is connected to a safety block 57 and the winder 55 and the other one of them passes through the overload detection sensor 59.

Four wire ropes 53 are provided on the railed frame 25 on both sides in the longitudinal direction of the worktable 21 so as to pass through the winder 55 so that the level of the worktable 21 can be maintained.

7, the portion of the wire rope 53 extending upward through the winder 55 is hooked on the hook portion 69a of the upper support 69, And is hooked on the hook 71a of the lower support 71 to be supported.

In this state, when the control unit 65 operates the winder 55, the work table 21 is lifted or lowered along the wire rope 53. The operation of the control unit 65 can be manually operated by an operator.

When the control unit 65 drives the four winders 55, one row of the wire rope 53 rises to the top while the other row is pulled down and the work table 21 is moved up and down Or four winders 55 are lifted or lowered on the wire rope 53 to raise and lower the work table 21.

When the worktable 21 ascends and descends, the support means 79 shown in Fig. 6 contacts the outer wall 10 of the storage tank and supports the worktable 21 in parallel with the outer wall 10 of the storage tank. Therefore, the friction between the work table 21 and the outer wall 10 of the storage tank is prevented and no shock occurs.

It is possible to perform a post tension operation in which the work table 21 is lifted and lowered along the wire rope 53 and provided to the work position by installing a steel wire 15 on the sheath 13 and tightening it after fixing it.

As shown in FIG. 7, the operation of installing the steel wire on the sheath 13 can be performed by placing workers on the work table 21 while holding the steel wire 15 by using a mobile crane.

5 (a), when the control unit 65 operates the cylinder 47 in a state in which the work table 21 is provided at the work position, the slide plates 28, And the distance between the foot plate 23 and the outer wall of the storage tank is minimized, thereby ensuring operational stability.

Therefore, the worker can climb the slide plates 28 and 29 and smoothly insert the steel wire 15 into the sheath 13 and pull it out.

5 (b), the steel wire 15 and the slide plates 28 and 29 are brought into contact with each other when the work table is moved up and down after the operation of inserting and pulling the steel wire 15 into the sheath 13 is completed The slide plate 28 and 29 are inserted into the bottom surface of the foot plate 23 by operating the cylinder 47 and moving the rod 49 backward.

A space 39 is formed between the foot plate 23 and the outer wall 10 of the storage tank to prevent interference between the steel wire 15 and the foot plate 23 when the work platform 21 ascends and descends. At this time, the slide frames 33 and 35 are slid toward the spacing space 39 and the folding frames 37 and 38 are rotated 90 degrees to prevent the operator from falling into the spacing space 39, 23 can be formed.

When the work table 21 is raised and lowered without inserting the slide plates 28 and 29 into the bottom surface of the foot plate, the anti-collision sensors 63 provided on the upper and lower surfaces of the slide plates 28 and 29, And transmits the signal to the control unit 65 when it is in proximity.

The control unit 65 operates the cylinder 47 to insert the slide plates 28 and 29 into the bottom surface of the foot plate 23 to prevent the collision between the steel wire 15 and the slide plates 28 and 29 . Alternatively, the control unit 65 may stop the lifting and lowering of the work table 21 to prevent the collision between the steel wire 15 and the slide plates 28 and 29.

The control unit 65 may stop the operation of the winder 55 or generate an alarm when the load sensed by the overload detection sensor 59 is equal to or greater than the set load.

If the left and right horizontal positions of the work table 21 do not match, the worker can manually adjust the horizontal position of the work table 21 by using the horizontal adjustment means 61.

On the other hand, when the emergency stop of the workbench 21 is required, the worker can stop the rising and falling of the workbench 21 by pressing the abnormal stop switch 81 provided in the control box. If the abnormal stoppage is resolved, It is possible to return to the automatic operation by pressing the button 83.

Since the construction of the post tension can be performed regardless of the height of the gondola for the post tension work, the construction period can be shortened and the work space can be maximized by the operator, so that the work radius can be widened.

In addition, unlike the frame scaffold in which the cost increases linearly as the work height increases, it is possible to adjust the work height by moving the work platform up and down. So that the construction period of the post tension can be shortened.

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

10: outer wall of the storage tank 11:
13: Sheath 15: Steel wire
20: Gondola 21: Workbench
23: foot plates 23a, 23b, 23c: first to third foot plates
25: Handrail frames 25a to 25l: First to 12th handrail frames
27: interference preventing means 28,29: slide plate
31: engaging portion 33, 35: slide frame
37, 38: folding frame 39: spacing space
41: drawing means 43: fixed rail
45: guide rail 47: cylinder
49: rod 51: ascending / descending means
53: Wire rope 55: Winder
57: Safety block 59: Overload detection sensor
61: horizontal adjustment means 63: crash prevention sensor
65: control unit 67: upper surface of the storage tank
69: upper support 71: lower support
73, 75: Brackets 69a, 71a:
77: working plate 79: supporting means

Claims (10)

A worktable installed up and down along an outer wall of a storage tank where a steel wire for post tension is installed;
Up and down means for raising and lowering the work table along the outer wall of the storage tank;
And interference preventing means for preventing interference between the work table and the steel wire when the work table ascends and descends along the outer wall of the storage tank,
The worktable
A foot plate having a plurality of plates assembled to have a surface corresponding to an outer wall of the storage tank;
And a balustrade frame assembled to the footrest to prevent an operator from falling down,
The interference preventing means
A slide plate inserted into the bottom surface of the footrest and assembled to be pullable by the drawing means,
A slide frame which is slidably assembled to the railing frame and forms a railing of the footrest at a portion where the slide plate is drawn out,
And a folding frame which is foldably assembled to the railing frame and forms a railing of the footrest at a portion where the slide plate is pulled out. delete The method according to claim 1,
The rising /
A plurality of wire ropes extending in the height direction of the outer wall of the storage tank,
A winder installed on the railing frame and connected to the wire rope;
A safety block installed in the railing frame and stopping the driving of the winder when the wire rope is broken;
And a control unit connected to the power source to control driving of the winder. The method of claim 3,
An overload detecting sensor is provided on the work table,
Wherein the control unit stops the operation of the winder or generates an alarm when the load detected by the overload detection sensor is equal to or greater than a set load. The method of claim 3,
Wherein the work table includes a horizontal adjustment means for manually aligning the work table when the work table is not leveled. The method of claim 3,
Wherein the wire rope is a two-wire wire rope which is hooked on an upper support installed on an upper surface of the storage tank and the other is hooked on a lower support installed on a lower surface of the storage tank,
Wherein one of the strings is pulled to the lower side and the other string is pulled to the lower side by driving the winder, and the winder is raised or lowered on the wire rope. delete The method according to claim 1,
And an anti-collision sensor for detecting proximity of the steel wire to the upper surface and the lower surface of the slide plate. The method according to claim 1,
The drawing means
A fixed rail installed at a lower portion of the foot plate,
A guide rail installed on a bottom surface of the slide plate to move along the fixed rail,
And a rod and a rod for pushing the slide plate so that the slide plate is moved along the fixed rail. The method according to claim 1,
And a support means provided at one side of the worktable and supporting the worktable by contact with an outer wall of the storage tank.

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