JPH1029161A - Rapair painting method and device for cylindrical structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform pre-painting treatment and spray painting by blast injection equivalent to ground work, in high lift work at the maintenance or renewal of painting for a cylindrical structure, etc. SOLUTION: In repair painting for an existing chimney outer surface, a shielded work space 12 is formed in the inside; while keeping an interval to a member outer surface in the constant length area of the horizontal fitting beam 53 of a chimney cylindrical body 51, and stretchingly mounting and surrounding a double mesh sheet 10, and a nozzle mounting body 13 is arranged, movably in a member length direction opposite to the member outer surface of a painting renewing object, in the shielded work space 12. A force-feeding supplying line of blast material is formed from a blasting device 23 on the ground; with the upper part floor 53a of a chimney as a relay part, and a relaying blast device 20 is interposed, and then surface treatment for the chimney outer surface is made, by jetting the blast material through the nozzle of a nozzle mounting body 13 and unmanned in the shielded work space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for renewing the coating of a tubular connecting beam and a tubular supporting tower of an existing steel chimney or other tubular structure provided in a power plant or the like.

[0002]

2. Description of the Related Art As an example of a steel chimney, FIG. 9 shows a multi-leg type chimney, and FIG. 10 shows a tower supporting type chimney. The multi-legged steel chimney is provided with a rigid reinforcing ring 52 at a height of three or four chimney cylinder bodies 51 built on a foundation, and the reinforcing rings 52 are mutually I-shaped. Horizontal connecting beam 5 with rigid section
3 are integrally connected.

[0003] A tower supporting chimney is constructed such that one or a plurality of chimney tube bodies 51 ′ are erected on a foundation inside a supporting tower 54 of a truss set.
Is supported from the side.

FIGS. 11 and 12 show a conventional method for renewing the coating of these existing steel chimneys. FIG. 11 is an enlarged side view of a portion XI in FIG. 9, and FIG. 12 is an enlarged side view of a portion XII in FIG. .

Conventionally, when renewing the coating of the connecting beam 53 and the supporting tower 54 of the existing steel chimney, a scaffold 55 is generally assembled against the connecting beam 53 and the supporting tower 54 as shown in FIGS. On the scaffold 55, the worker 56 removes the old paint by using a rust remover 57 such as a mobile rotary wire brush or a rotary sander, performs a base treatment to polish the steel plate ground, and after finishing the base treatment, A paint can is lifted on the scaffold 55 by a hoist, and an operator performs painting by hand using a brush, a roller, a hand-held spray gun, or the like.

[0006]

As a paint for steel structures to be provided outdoors, there are known paints such as Zinc-based, urethane-based, and fluororesin-based paints having excellent weather resistance, chemical resistance, and ultraviolet resistance. . In addition, when applying these paints, it is generally required to perform a high-precision base treatment by shot blast or sand blast.

[0007] When constructing a steel chimney, there is no problem since blast treatment is performed at the factory, base coating is performed, and then local construction and finishing coating are performed. Even when renewing the coating of aged steel chimneys, it is necessary to sufficiently treat the surface of the steel sheet in order to perform a durable coating, but blasting work is difficult because it is an aerial work. It has to rely on the rust removal and painting by the handwork of the workers.

For this reason, there is a problem that it takes a long time to remove the old coating film and rust and to apply the coating, and it is not possible to perform the base treatment with sufficient accuracy, and the durability of the newly applied coating material is deteriorated.

Accordingly, the present invention provides a method of renewing the coating of an existing tubular structure by applying a structural member such as a connecting beam or a supporting tower of the tubular structure by blast spraying at a high altitude work, which is equivalent to ground work. It is intended to enable processing and spray coating.

[0010]

In order to achieve this object, according to the present invention, when repairing and painting the outer surface of an existing tubular structure, structural members such as a connecting beam of the tubular body and a supporting tower are required. A double mesh sheet is stretched and surrounded to maintain a space with the outer surface of the member of a certain length area to form a shielding work space inside, and the shielding work space faces the outer surface of the member to be repainted in the member length direction Deploy the nozzle mounting body so that it can move to
Forming a compressed air supply line for blasting material or compressed air for spray painting from the ground with the upper floor of the tubular structure as a relay section,
After passing through the relay portion, the blast material or the spray paint is sprayed through the nozzle of the nozzle mounting body, and the inside of the shielding work space is unmanned to perform ground treatment or spray painting of the outer surface of the tubular structure.

[0011] Further, as an apparatus therefor, a coating renewal method in which a double mesh sheet is stretched around a fixed length area of a structural member such as a connecting beam of a tubular body, a supporting tower or the like, and a double mesh sheet is stretched and surrounded. A shielding work space for work, a nozzle support frame movably provided through a moving mechanism in the member length direction at a distance from the outer surface of the tubular structure in the shielding work space, and a horizontal And a blast nozzle or spray coating nozzle provided so as to be selectively swingable around the vertical axis, a monitoring television camera provided so as to be able to move integrally with the nozzle, and a blast material or a spray coating nozzle on the blast nozzle or spray coating nozzle It is characterized by comprising a device for pressure-feeding the spray paint.

According to the present invention, the blast material sprayed in the blasting operation performed in the sky and the dust such as paint film and rust peeled off from the steel plate surface are blocked by the double mesh sheet surrounding the work place. It stays in the shielded space and is prevented from flying outside. Similarly, only the volatile components of the paint sprayed in the spray coating operation performed in the sky are diffused through the double mesh sheet, and the pigment components are blocked by the double mesh sheet surrounding the workplace, thereby preventing scattering to the outside. You.

At the time of the undercoating work, a blast nozzle is mounted on the nozzle support frame in the shielding work space, and a blast material pressure feeding device is provided between the ground and the nozzle. At the time of painting, a spray coating nozzle is provided on the nozzle support frame. Replacing the spray paint feeder between the ground and the nozzle.

The nozzle support frame (nozzle mounting body) in the shielding work space moves from top to bottom or sideways at a speed adjusted by an external control operation, and moves the nozzle vertically or vertically under the monitoring of a monitoring television camera. While changing the aim of the nozzle by swinging sideways, blasting or painting the upper surface, lower surface, and side surfaces of the beam member, the outer surface of the steel tower member, the outer surface of the flange portion, and the like.

The blast material is supplied by pressure feeding from a blast device on the ground to a blast device on the upper floor by a high-pressure air flow supplied by a compressor, using a blast device provided on the floor above the tubular structure as a relay unit, The blast device on the upper floor distributes and supplies the blast nozzles to the blast nozzles on the nozzle support frame (nozzle mounting body), and the blasting is performed from each blast nozzle under unmanned conditions.

The blast material sprayed from the blast nozzle in the shielded work space, and the coating film, rust and other dusts peeled off from the member surface by this fall and accumulate on the floor surface in the shielded space, thereby completing the blasting operation. Later, the end of the collection hose connected to the vacuum pump on the ground is inserted into the shielded space, suctioned, collected into the blast device on the ground, and reused.

The supply line of the blast material between the blast device on the ground and the blast device on the upper floor is also used as a recovery line by switching operation of a flow path switching valve provided at a connection portion.

The supply of the paint for spraying is performed by a paint container provided on the floor above the tubular structure, a paint pump and a compressor on the ground, and a nozzle support frame (nozzle mounting body).
Supply to each spray coating nozzle above.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment [Configuration] FIG. 1 shows a connecting beam 53 according to a first embodiment of the present invention.
FIG. 2 is a side view schematically showing an undercoating method and apparatus of a part, FIG. 2 is a side view schematically showing a coating method and an apparatus of a connecting beam 53 part,
FIG. 3 is a sectional view taken along arrows III to III in FIG. 1, and FIG.
FIG. 5 is an enlarged sectional view of the portion, and FIG. 5 is a plan view taken along arrows V to V in FIG.

1 and 3, reference numeral 10 designates a connecting beam 53 between the reinforcing rings 52 corresponding to the portion A in FIG. 9 as one paint renewal area, and extends vertically around the connecting beam 53 at intervals. A double mesh sheet of about 1 mm mesh, which is connected to and supported by a plurality of support wires 11 so as to be in contact with the outside and stretched and shielded around the connection beam 53 in the paint renewal area, and 12 is a double mesh sheet 10. The inside of the enclosed work space 13 has a wheel 1 on the handrail 14 on the connecting beam 53 at the upper end.
A nozzle supporting frame (nozzle mounting body) movably supported via 5, 16 is a plurality of nozzle supporting bases detachably mounted on the nozzle supporting frame 13, and 17 is detachably supported on each nozzle supporting base 16. The two-axis swing type blast or spray coating nozzle 18 is a monitoring television camera provided on each nozzle support 16 so as to be able to swing integrally with the nozzle 17.

Nozzle support frame (nozzle mounting body) 13
As shown in FIG. 3, a beam member 13a movably supported on a handrail 14 via wheels 15 and a pair of parallel nozzle mounting members 13b provided at both ends of the beam member 13a in a vertical direction.
And a bolt hole 13c for nozzle mounting provided at a constant pitch on the nozzle mounting member 13b, and a member 13d for interconnecting the lower ends of the nozzle mounting member 13b in an assembling manner,
The connection beam 53 is provided so as to surround the connection beam 53 at a certain interval. 13
f denotes a moving device of an endless chain drive type nozzle support frame (nozzle mounting body) 13 connected to the beam member 13a and arranged in the length direction of the connecting beam 53.

As shown in FIGS. 4 and 5, the nozzle support base 16 is a shelf-shaped base 16a that is bolted and mounted to upper and lower bolt holes 13c of a pair of parallel nozzle mounting members 13b.
And a horizontal rotating frame 16c supported in the shelf 16a so as to be movable about a vertical axis by driving a motor 16b on the shelf 16a.
And a vertical rotation frame 16e for nozzle support supported in the horizontal rotation frame 16c so as to be movable about a horizontal axis by driving a motor 16d on the outer surface of the horizontal rotation frame 16c side plate.

The nozzle 17 is supported in the vertical rotation frame 16e of the nozzle support base 16 so as to face the connecting beam 53, and the monitoring television camera 18 is provided on the protruding portion of the top plate of the vertical rotation frame 16e. The nozzle 17 and the monitoring television camera 18 rotate integrally about a horizontal or vertical axis by driving either of the motors 16b or 16d, and the blasting or spray coating by the nozzle 17 is constantly monitored by the monitoring television camera 18. Making it possible.

Returning to FIG. 1, reference numeral 53a denotes a floor on the connecting beam 53 near the mounting portion of the double mesh sheet 10, and 19 denotes a floor 53a.
An accumulator provided above, 20 is a blasting device for relay on a floor 53a, 21 is a receiver tank, and 22 is an accumulator 19
, A ground blast device, 24, a dust remover connected to the blast device 23, 25
Is a vacuum pump for suction and recovery connected to the dust remover 24.

Reference numeral 26 denotes a blast material pressure feed pipe extending upward from the compressor 22 through an outlet of the blast device 23, 27 denotes a flow path switching valve at the end of the blast material pressure feed pipe 26,
28 is a blast material recovery pipe connected from the flow path switching valve 27 to the upper end of the ground blast device 23; 29 is a flow path switching valve provided at the end of the inlet pipe 21a of the receiver tank 21 on the upper floor 53a; A suction hose for recovery led from the switching valve 29 to the vicinity of the floor in the shielded space 12, and 31 is a flow path switching valve 27
A blast material supply / recovery hose connected between the blast material and the blast material 29, and a blast material 32 connected to each blast nozzle 17 in the shielding work space 12 from the pressure accumulator 19 on the floor 53a via the outlet of the relay blast device 20. The pumping tube (and hose).

These devices are, for example, ones provided on the ground.
Blasting device 23 and a plurality of blasting devices 20 provided on floor 53a are connected by one line of supply / collection hose 31 and input side pipe 21a branched from flow path switching valve 29, Each blasting device 20 on the floor 53a is connected to a plurality of blast nozzles 17 on a nozzle support frame (nozzle mounting body) 13 by a blasting material feed pipe 32 and a branch hose.

The number of blasting devices and the number of combinations of blasting devices can be changed according to the number of blast nozzles used simultaneously in the shielding work space.

Next, FIG. 2 shows that a spray coating nozzle 17 is mounted on the nozzle support frame (nozzle mounting body) 13.
It is a side view which shows the apparatus structure at the time of the coating which replaced and provided the paint press-feeding line for spray coating on the ground and the upper floor 53a.

In FIG. 2, reference numeral 35 denotes a paint container suspended from an upper floor 53a, and reference numeral 36 denotes a compressor 22 on the ground.
A paint pressure pump connected to the upper floor 53a and connected to
37 is a paint suction pipe extending from the paint pump 36 into the paint container 35, 38 is a paint pump pipe of the paint pump 36,
Reference numeral 39 denotes a distributor connected to the end of the paint feed pipe 38, and reference numeral 40 denotes a plurality of paint supply hoses connected from the distributor 39 to the spray paint nozzle 17 on the nozzle support frame (nozzle mounting body) 13.

Although not shown, a paint pressure feed switching valve and a recovery hose are provided at appropriate positions of the nozzle support frame (nozzle mounting body) 13, and after finishing the paint, the paint remaining in the paint supply hose 40 is returned to the paint container. Provide functions.

[Operation / Effect] As shown in FIG. 1, in the repair painting of the chimney, first, a double mesh sheet 10 is stretched around a connecting beam 53 of one of the existing chimneys while maintaining a space between the member outer surface. A shielding work space 12 is formed therein, and a nozzle support frame (nozzle mounting body) 13 is mounted around the connecting beam 53 in the shielding work space. The upper and middle heights of the nozzle support frame (nozzle mounting body) 13 As shown in FIG. 3, a plurality of nozzle support bases 16 and blast nozzles 17 are mounted, and blast material pressure supply lines are provided on the ground and on the upper floor.

The motors 16b and 16d are driven by remote control while being monitored by the monitoring television camera 18, and the upper nozzle 17 is vertically and horizontally swing-adjusted so as to aim at the upper flange upper surface of the connecting beam 53, and the intermediate height nozzle Reference numeral 17 designates a horizontal sight on the beam surface of the connecting beam 53, and then supplies the blasting material from the blasting material supply line while vertically swinging each nozzle 17, and the nozzle support frame (nozzle mounting Body) 13 is connected to beam 53
The blasting of the upper surface of the upper flange and the surface of the girder plate is performed by moving the lower surface in the longitudinal direction at a low speed.

When the nozzle support frame (nozzle mounting body) 13 is stopped at the end position of the connecting beam 53 and the nozzle is swung horizontally and vertically at this position, the periphery of the reinforcing ring 52 connected to the connecting beam 53 is rotated. Blasting can be performed simultaneously.

Next, at the end of the connecting beam 53, the upper nozzle support 16 is replaced with a position directly below the upper flange of the connecting beam 53, and is aimed at the lower surface of the upper flange. To a fixed height, aiming at the girder plate surface in the horizontal direction, and monitor each nozzle 1 under the monitoring by the monitoring TV camera.
By moving the nozzle support frame (nozzle mounting body) 13 at a low speed in the opposite direction by the moving device 13f while vertically swinging 7, the blasting of the lower surface of the upper flange and the surface of the girder plate is performed, and the same operation is repeated to couple. Beam 53
Unattended blasting of all exterior surfaces.

At this time, the blast material sprayed on the connecting beam 53 and the dust such as the paint film and rust scraped off by the blast material are shielded by the double mesh sheet 10 to prevent scattering to the outside, and Drops and accumulates on the floor in the work space, and switches the flow path switching valves 27 and 29 after the blast operation is completed.
By driving the vacuum pump 25, suction is performed by the collection suction hose 30 inserted into the shielding work space, and
And collects it in the ground blast device 23.

After collecting the dust-containing blast material, the double mesh sheet 10 is removed, the nozzle support frame (nozzle mounting body) 13 is disassembled, and moved to another connecting beam 53 (paint renewal area) for installation. , And the base treatment by the injection of the same blast material is repeated.

The outer surface of the stack body 51 of the chimney is also blasted by another method similar to the above, and after finishing the entire outer surface of the multi-leg type chimney, the nozzle 17 on the nozzle support frame (nozzle mounting body) 13 is finished. Is replaced with a spray coating nozzle, and the blast material supply devices on the ground and the upper floor are replaced with the spray paint supply device shown in FIG.

A nozzle support frame (nozzle mounting body) 13 and a double mesh sheet 10 are mounted around the connection beam 53 at the top of the chimney to form a shielding work space 12, and spray painting is performed in the same procedure as in the blast work. The nozzle 17 and the nozzle support frame (nozzle mounting body) 13 are moved and the spraying paint is supplied and sprayed while monitoring the spraying location with the monitoring television camera 18, so that the joining beam is unmanned in the shielding work space 12. Spray painting around 53 is performed, and the double mesh sheet 10 and the nozzle support frame (nozzle mounting body) 13
Are sequentially moved around the other connecting beam 53 to repeat the spray painting.

At this time, only the volatile component of the paint sprayed from the spray coating nozzle 17 escapes through the double mesh sheet 10 to the outside, and the pigment component is blocked by the double mesh sheet 10 to prevent scattering to the outside. Is done.

According to this configuration, in repair painting of the existing chimney structural member, installation of a scaffold for work around the chimney structural material and manual preparation and painting work are eliminated, and base treatment and painting at a high place are eliminated. The work can be easily performed by high-precision automatic blasting and automatic spray painting equivalent to ground work.

[Second Embodiment] [Configuration] Next, FIG. 6 shows a repair painting method and apparatus according to the present invention.
FIG. 7 is a side view showing a case where the present invention is applied to a part, and FIG.
FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. 7.

6 to 8, reference numeral 54 a denotes a supporting tower 5.
4b, a horizontal member connecting between the column members 54a;
4c is a diagonal member, 54d is a joint member of each member 54a to 54c, 11 'is a support wire stretched in parallel with the side of the tower 54 at intervals outside and inside of the support tower 54, 41 is supported on the side of the tower 54. It is also a plurality of guide wires extending in parallel with the side of the tower 54 inside and outside the tower between the wires 11 '.

Reference numeral 10 'extends around a fixed length area of the support member 54a along the outside of the support wire 11', and is supported by the support wire 11 'in a planar rectangular cross section. A double mesh sheet formed by winding and narrowing around a 54a and forming a shielding work space 12 therein. A guide 42 is provided at a distance from the outer surface of the member of the supporting tower 54 so as to face the inside and outside of the side surface of the tower in the shielding work space 12. Two sets of inner and outer nozzle support frames (nozzle mounting bodies) of a flat L shape supported by wires 41 so as to be able to move up and down. The planar shape of the nozzle support frame (nozzle mounting body) 42 may be appropriately configured according to the horizontal cross-sectional shape of the support tower.

Each nozzle support frame (nozzle mounting body) 4
2 is a plane L-shaped beam body 42a as shown in FIG.
And a drive drum 42b provided at a plurality of positions on the beam main body 42a and wound around and engaged with the guide wire 41.
And a pair of parallel short nozzle mounting members 42 projecting downward from the lower surfaces near the corners and both ends of the L-shaped beam main body 42a.
c, the nozzle support 16 having the same configuration as that of the first embodiment (FIGS. 4 to 5) is mounted on the nozzle mounting member 42c,
A blast or spray coating nozzle 17 and a monitoring television camera 18 are provided on a nozzle support 16.

On the ground floor and the upper floor of the supporting steel tower, a blasting material supply device or a paint pressure supply device similar to that shown in FIG. 1 or FIG.

[Operation / Effect] In the underlaying work around the tower support 54a, the blast nozzle 17 is mounted on the nozzle support 16 and a blast feeder is provided on the ground and on the upper floor 53a of the tower. .

At the upper position in the shielding work space 12 covered with the double mesh sheet 10 ', two sets of inner and outer nozzle support frames (nozzle mounting bodies) 42 are set, and a plurality of blast nozzles 17 are driven by motors 16b and 16d, respectively. A blast material is sprayed from the nozzle 17 while monitoring the aiming position of the nozzle by the monitoring television camera 18, the nozzle 17 is swung in the vertical direction, and When the swing is slightly performed, the entire periphery of the column member 52a having the vertical swing width is blasted automatically by an unattended person.

By the driving operation by the driving drum 42b, the nozzle support frame (nozzle mounting body) 42 is lowered by the vertical swing injection width of the nozzle 17 and the same blast material injection is repeated, so that the outer surface of the support member 54a becomes vertical. It is blasted continuously in the direction.

Nozzle support frame (nozzle mounting body) 42
When the nozzle 17 faces the diagonal member 54c or the horizontal member 54b or the joint member 54d during the downward movement of the TV camera 1,
By monitoring the nearest nozzle 17 to the diagonal member 54c or the horizontal member 54b or the joint member 54d under the monitoring by 8, and swinging vertically or horizontally, each of these members can be blasted at the same time.

When the above-mentioned nozzle support frame (nozzle mounting body) 42 is formed in a plane I shape for the side of the tower,
The remaining tower side area can be blasted in a similar manner. After changing the position where the double mesh sheet 10 'is stretched and blasting the entire tower, the blast nozzle on the nozzle support frame (nozzle mounting body) 42 is replaced with the spray coating nozzle 17, and the ground and the upper part of the tower are blasted. The floor apparatus can be replaced with a paint pumping apparatus, and unattended automatic spray coating can be performed by remote control from above the support tower 54 by a similar operation. Other functions and effects are the same as those of the first embodiment.

[0051]

In summary, the present invention relates to a method for repairing an outer surface of an existing tubular structure, the method comprising:
Maintain the space between the outer surface of the fixed length area of the structural member such as the supporting tower and the space, stretch and surround it with a double mesh sheet to form a shielding work space inside, and inside this shielding work space, the outer surface of the member to be repainted A nozzle mounting body is provided so as to be movable in the member length direction in opposition to the above, and a pressure feeding supply line of blast material or compressed air for spray coating is formed from the ground with the upper floor of the tubular structure as a relay portion, and relaying is performed. After passing through the part, the blasting material or spray paint is sprayed through the nozzle of the nozzle mounting body, and the inside of the shielding work space is unmanned to perform the ground treatment or spray coating of the outer surface of the tubular structure, and As a device, a shielding work space for painting renewal work in which a double mesh sheet is stretched around the outer surface of a fixed length area of structural members such as connecting beams of existing tubular structures, supporting towers, etc. And a tube in this shielding work space A nozzle support frame movably provided through a moving mechanism in the member length direction at an interval from the outer surface of the structure, and a blast nozzle provided on this nozzle support frame so as to be selectively swingable about horizontal and vertical axes or By providing a spray coating nozzle, a monitoring television camera provided so as to be able to swing integrally with the nozzle, and a device for feeding the blast material or the spray paint to the blast nozzle or the spray paint nozzle, the existing spray nozzle is provided. At the time of renewal of the coating of the tubular structure, the structural members such as the connecting beam and the supporting tower of the tubular structure are automatically grounded and spray-painted at high altitudes by blast injection equivalent to ground work. The effect that it can be performed with high efficiency was produced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a base treatment step and an apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of a mounting painting process and an apparatus corresponding to FIG.

FIG. 3 is a sectional view taken along arrows III to III in FIG. 1;

FIG. 4 is an enlarged sectional view of a portion IV in FIG. 3;

FIG. 5 is a plan view as seen from arrows V to V in FIG. 4;

FIG. 6 is an enlarged side view corresponding to FIG. 3 according to a second embodiment of the present invention.

FIG. 7 is a plan view taken along arrows VII to VII in FIG. 6;

8 is a sectional view taken along arrows VIII to VIII in FIG. 7;

FIG. 9 is a schematic side view of a multi-legged steel chimney.

FIG. 10 is a schematic side view of a steel chimney supported by a steel tower.

FIG. 11 is a schematic side view of a conventional repair painting method in a part XI of FIG. 9;

FIG. 12 is a schematic side view of a conventional repair painting method in a portion XII in FIG.

[Explanation of symbols]

 10, 10 'Double mesh sheet 11, 11' Support wire 12 Shielding work space 13, 42 Nozzle support frame (nozzle mounting body) 13a Beam member 13b, 42c Nozzle mounting member 13c Bolt hole 13d Lower end connecting member 14 Handrail 15 Wheel 16 Nozzle mounting table 16a Shelf table 16b Horizontal swing motor 16c Horizontal rotating frame 16d Vertical swing motor 16e Vertical rotating frame 17 Blasting or spray painting nozzle 18 Monitoring television camera 19 Pressure accumulator 20 Relay blasting device 21, 34 Receiver tank 22 Compressor 23 Above-ground blast device 24 Deduster 25 Vacuum pump 26, 32 Blast material pressure feed pipe 27, 29 Flow path switching valve 28 Blast material collection tube 30 Recovery suction hose 31 Blast material supply / collection hose 35 Upper part Paint containers on the floor 36 paint pressure pump 37 paint suction pipe 38 paint pressure pipe 39 distributor 40 paint supply hose 41 guide wire 42a beam body 42b drive drum 51 chimney tube body 52 reinforcing ring 53 connecting beam 53a upper floor on connecting beam 54 support iron tower 54a Post material 54b Horizontal material 54c Diagonal material 54d Joint member

Continuing on the front page (72) Inventor Hiroshi Kondo 4-62-22 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Masashi Fukumoto 4-622 Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima No. Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Takeji Matsumoto Inside Mitsubishi Heavy Industries, Ltd. 5-34-6 Shiba, Minato-ku, Tokyo

Claims (2)

[Claims] The present invention relates to a double mesh sheet for repairing and painting an outer surface of an existing tubular structure by maintaining a space between the outer surface of a fixed length area of a structural member such as a connecting beam of a tubular body, a supporting tower and the like. And a shielding work space is formed inside, and a nozzle mounting body is provided in the shielding work space so as to be movable in a member length direction in opposition to an outer surface of a member to be renewed for coating, and a cylindrical structure is provided. The upper floor is used as a relay part to form a blast material or compressed air supply line for spray coating from the ground, and after passing through the relay part, the blast material or spray paint is sprayed through the nozzle of the nozzle mounting body to perform shielding work A method of repairing and repairing a tubular structure, characterized in that the interior of the space is unmanned and the outer surface of the tubular structure is subjected to groundwork or spray coating. 2. A shield for a paint renewal work in which a double mesh sheet is stretched and surrounded while maintaining a predetermined length of space between the outer surface of a structural member such as a connecting beam, a supporting tower and the like of an existing tubular structure. A work space, a nozzle support frame movably provided through a moving mechanism in the member length direction at a distance from the outer surface of the tubular structure in the shielding work space, and a horizontal and vertical axis on the support frame. A blast nozzle or spray coating nozzle provided so as to be selectively swingable, a monitoring television camera movably provided integrally with the nozzle, and a blast material or spray paint being pumped to the blast nozzle or spray coating nozzle. A repairing and coating apparatus for a tubular structure, characterized by comprising a supplying apparatus.