JP2013111532A - Device and method for internal coating of pipes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for internal coating of pipes capable of surely moving in the whole inside of a pipe and capable of effectively and uniformly coating the inside of the pipe, and to provide a method for internal coating of pipes.SOLUTION: The device 2 for internal coating of pipes includes nozzles 12 and 13 provided in a long and narrow body 10, capable of spraying a coating material and rotatable around a longitudinal axis 10c of the body 10, and the device 2 coats the inside of the pipe 101 by spraying the coating material from the nozzles 12 and 13 by rotating the nozzles 12 and 13 in the sate of being inserted into the inside of the pipe 101 along the height of a steel tower 100. The two nozzles 12 and 13 are arranged spaced apart in the longitudinal direction, and are stored in an inner region than an outer periphery of the body 10, and one of the two nozzles 12 and 13 sprays the coating material to the obliquely downward direction to a reference surface 10d perpendicular to the axis 10c of the body 10 during coating of the inside of the pipe 101, and the other of the nozzles 12 and 13 sprays the coating material to the obliquely upward direction to the reference surface 10d during coating of the inside of the pipe 101. The method for internal coating of pipes uses the device 2.

Description

  The present invention relates to an in-pipe coating apparatus and an in-pipe coating method for coating the inside of a pipe disposed along the height direction of a steel tower.

  In steel towers for communication and the like, in many cases, support pipes that support the steel tower are arranged from the ground along the height direction of the steel tower. Although this column pipe is subjected to rust prevention treatment such as plating, the rust prevention performance of the column pipe may deteriorate due to exposure of the column pipe to wind and rain. Therefore, the strut pipe is regularly rust-proofed. However, since the space inside the support pipe is very narrow, it is very difficult to efficiently and uniformly paint the entire inside of the support pipe. For this reason, various methods have been proposed in order to efficiently and uniformly paint the inside of the support pipe by moving inside the support pipe.

  For example, the coating apparatus of Patent Document 1 includes a rod-shaped main body, and a paint sprayer attached to the tip of the rod-shaped main body so as to be rotatable about an axis extending along the longitudinal direction of the rod-shaped main body. The coating material is sprayed in a direction perpendicular to the longitudinal axis direction of the rod-shaped main body from a plurality of spray nozzles arranged at intervals in the circumferential direction at the tip end portion. Such a coating device is inserted into the support pipe with its longitudinal direction along the longitudinal direction of the support pipe, and along the longitudinal direction of the support pipe toward the area to be coated on the inner peripheral surface of the support pipe. The inside of the strut pipe is painted by spraying the paint vertically from the spray nozzle of the paint sprayer to the inner peripheral surface of the strut pipe while rotating the paint sprayer of the coating equipment that has been moved and moved to the painting target area .

JP 2006-82051 A

  Projections and recesses may be formed on the inner peripheral surface of the tower column pipe. Typically, the tower column pipe has a flange protruding from the inner peripheral surface toward the center thereof. And a hole penetrating along the longitudinal direction of the column pipe may be formed in the flange. However, in the coating apparatus of Patent Document 1, since the paint is sprayed perpendicularly to the area to be coated on the inner peripheral surface of the strut pipe, the coating apparatus includes a convex portion and a concave portion on the inner peripheral face of the strut pipe, and It is difficult to efficiently and uniformly paint the upper and lower portions of the flange protruding from the inner peripheral surface of the column pipe.

  Further, the coating apparatus needs to pass through the inside of the support pipe, particularly through a small flange hole. However, in the coating apparatus of Patent Document 1, a plurality of spray nozzles are arranged at intervals in the circumferential direction at the tip of the paint sprayer, and the cross section of the spray nozzle mounting portion in the coating apparatus is large. Therefore, when the cross section of the support pipe, particularly the hole of the flange, is small, the spray nozzle mounting portion of the coating apparatus may not pass through the inside of the support pipe, particularly the hole of the flange. As a result, the coating apparatus cannot move over the entire support pipe, and the entire interior of the pipe cannot be efficiently and uniformly applied.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide an in-pipe coating apparatus capable of reliably moving the entire inside of the pipe and coating the inside of the pipe efficiently and uniformly. It is to provide an in-pipe coating method.

In order to solve the problem, an in-pipe coating apparatus according to an aspect of the present invention includes:
A main body formed in an elongated shape;
A nozzle provided on the main body, configured to spray paint, and configured to be rotatable about an axis extending along the longitudinal direction of the main body.
By rotating the nozzle and spraying the paint from the nozzle while being inserted along the longitudinal direction of the pipe into the pipe arranged along the height direction of the steel tower, the inside of the pipe In-pipe painting equipment that is configured to paint
Two nozzles are provided,
The two nozzles are spaced apart from each other in the longitudinal direction of the main body, and are housed in a region inside the outer periphery of the main body;
One of the two nozzles is oriented to spray the paint obliquely downward with respect to a reference plane perpendicular to the axis of the body when painting the interior of the tube;
The other of the second nozzles is oriented so as to spray the paint in an obliquely upward direction with respect to the reference plane when the inside of the pipe is painted.

Further, in the in-pipe coating apparatus according to one aspect of the present invention, a nozzle connection pipe is provided that connects the two nozzles and supplies the paint to the two nozzles.
The nozzle connecting pipe is formed in a substantially crank shape in a connecting section of the two nozzles, and is housed in a region inside the outer periphery of the main body;
It is preferable that the base end portion of the nozzle is attached to the concave portion of the nozzle connection pipe.

In order to solve the problem, an in-pipe coating method according to an aspect of the present invention includes:
Using the above-described in-pipe coating apparatus according to one aspect of the present invention, a flange extending from the inner periphery of the pipe toward the center of the pipe, and a flange hole formed in the flange so as to penetrate in the longitudinal direction of the pipe An in-pipe coating method for coating the inside of the pipe having:
Moving the interior of the tube longitudinally through the flange hole of the tube through the in-pipe coating device;
By spraying the paint from one of the two nozzles in a state where one of the two nozzles of the in-pipe coating apparatus is disposed above the flange, the upper part of the flange is coated, Painting the lower part of the flange by spraying the paint from the other of the two nozzles with the other of the two nozzles disposed below the flange.

According to the present invention, the following effects can be obtained.
An in-pipe coating apparatus according to an aspect of the present invention includes:
A main body formed in an elongated shape;
A nozzle provided on the main body, configured to spray paint, and configured to be rotatable about an axis extending along the longitudinal direction of the main body.
By rotating the nozzle and spraying the paint from the nozzle while being inserted along the longitudinal direction of the pipe into the pipe arranged along the height direction of the steel tower, the inside of the pipe In-pipe painting equipment that is configured to paint
Two nozzles are provided,
The two nozzles are spaced apart from each other in the longitudinal direction of the main body, and are housed in a region inside the outer periphery of the main body;
One of the two nozzles is oriented to spray the paint obliquely downward with respect to a reference plane perpendicular to the axis of the body when painting the interior of the tube;
The other of the second nozzles is oriented so as to spray the paint in an obliquely upward direction with respect to the reference plane when the inside of the pipe is painted.
Therefore, the entire two nozzles are arranged in a limited area inside the outer periphery of the main body, and the cross section of such a main body can be made smaller than the cross section of the pipe of the steel tower. Therefore, the in-pipe coating apparatus can reliably move over the entire pipe. Moreover, even if a convex portion or a concave portion is formed on the inner peripheral surface of the steel tower tube, the upper region of the convex portion or the lower side of the concave portion is formed by one of the two nozzles spraying the paint obliquely downward. The area is painted efficiently and uniformly, and the lower area of the convex part or the upper area of the concave part is efficiently and uniformly painted by the other of the two nozzles spraying the paint diagonally upward. . Therefore, the inside of various forms of pipes can be painted efficiently and uniformly.

In the in-pipe coating apparatus according to one aspect of the present invention, a nozzle connection pipe that connects the two nozzles and supplies the paint to the two nozzles is provided,
The nozzle connecting pipe is formed in a substantially crank shape in a connecting section of the two nozzles, and is housed in a region inside the outer periphery of the main body;
Since the base end of the nozzle is attached to the concave portion of the nozzle connection tube,
The entire nozzle connection pipe is also arranged in a limited area inside the outer periphery of the main body together with the two nozzles, and the cross section of such a main body can be made smaller than the cross section of the tower pipe. Therefore, the in-pipe coating apparatus can reliably move over the entire pipe.

A pipe coating method according to an aspect of the present invention includes a flange extending from the inner periphery of the pipe toward the center of the pipe and penetrating in the longitudinal direction of the pipe, using the pipe coating apparatus according to the aspect of the present invention described above. An in-pipe coating method for coating the inside of the pipe having a flange hole formed in the flange,
Moving the interior of the tube longitudinally through the flange hole of the tube through the in-pipe coating device;
By spraying the paint from one of the two nozzles in a state where one of the two nozzles of the in-pipe coating apparatus is disposed above the flange, the upper part of the flange is coated, Painting the lower part of the flange by spraying the paint from the other of the two nozzles with the other of the two nozzles disposed below the flange.
Therefore, since the cross section of the main body can be made smaller than the flange hole, the in-pipe coating apparatus can surely pass through the hole of the flange. Therefore, the in-pipe coating apparatus can reliably move over the entire pipe. In addition, the upper part of the flange is efficiently and uniformly applied by one of the two nozzles spraying the paint in the diagonally downward direction, and the lower part of the flange is formed by the other of the two nozzles spraying the paint in the obliquely upward direction. It will be painted efficiently and uniformly. Therefore, the flange inside the pipe can be painted efficiently and uniformly.

It is explanatory drawing which shows typically the state which used the pipe repair system provided with the pipe coating apparatus which concerns on embodiment of this invention for the steel tower. 1 is a perspective view schematically showing an in-pipe coating apparatus according to an embodiment of the present invention. 1 is a partial longitudinal sectional view schematically showing an in-pipe coating apparatus according to an embodiment of the present invention. It is a longitudinal cross-sectional view which shows schematically the nozzle unit of the in-pipe coating apparatus which concerns on embodiment of this invention, and its periphery.

An in-pipe coating system (hereinafter referred to as “painting system”) including an in-pipe coating apparatus (hereinafter referred to as “coating apparatus”) and an in-pipe coating method according to an embodiment of the present invention will be described.
Initially, with reference to FIG. 1, the steel tower 100 used as the coating object in embodiment of this invention is demonstrated. As shown in FIG. 1, the steel tower 100 includes a column pipe 101 disposed along the height direction from the ground G, and a stage 102 provided at the top of the steel tower 100. The upper end portion of the support pipe 101 protrudes from the stage 102, and an opening 101 a is formed at the upper end of the support pipe 101. As shown in FIG. 3, a flange 103 extending from the inner peripheral surface 101 b of the support pipe 101 toward the center of the cross section of the support pipe 101 is formed on the support pipe 101. The flange 103 is formed with a flange hole 104 penetrating along an axis 101c extending in the longitudinal direction of the column tube 101. Note that the axis 101 c passes through the center of the cross section of the column tube 101.

  Next, with reference to FIG. 1, the main structure of the coating system 1 is demonstrated. As shown in FIG. 1, the coating system 1 includes a coating apparatus 2, and the interior of the column pipe 101 is painted in a state where the coating apparatus 2 is inserted into and suspended from the column pipe 101. It is the composition to do. Furthermore, the coating system 1 includes a guide device 3, and the guide device 3 is configured to guide the coating device 2 along the axis 101 c of the support pipe 101. The coating system 1 includes a wire lifting / lowering device 4, and the wire lifting / lowering device 4 is configured to be able to wind and unwind a wire 5 that suspends the coating device 2. The tip is attached to the coating apparatus 2. The coating system 1 includes a hose lifting device 6, and the hose lifting device 6 winds up a coating hose 7 that supplies coating material to the coating device 2 and an air hose 8 that supplies air to the coating device 2. And it is comprised so that unwinding is possible. The painting system 1 includes a control device 9, and the control device 9 is configured to be able to control each device of the painting system 1. The guide device 3, the wire lifting / lowering device 4, the hose lifting / lowering device 6, and the control device 9 can be installed on the stage 102 at the top of the steel tower 100.

  Here, the detail of the coating apparatus 2 is demonstrated with reference to FIGS. As shown in FIGS. 2 and 3, the coating apparatus 2 has a hollow main body 10 formed in an elongated shape, and in the present embodiment, the main body 10 is formed in a substantially cylindrical shape. As shown in FIGS. 3 and 4, the distal end portion 10 a of the main body 10 is formed in a substantially conical shape so as to become narrower from the proximal end of the main body 10 toward the distal end, and the proximal end portion of the main body 10. 10b is formed in the substantially cone shape so that it may become thin toward the base end from the front-end | tip of the main body 10. FIG. A nozzle unit 11 is disposed along the longitudinal direction of the main body 10 on the base end side with respect to the distal end portion 10a of the main body 10, and the nozzle unit 11 is capable of spraying paint. And a second nozzle 13 and a nozzle connection pipe 14 for connecting the first nozzle 12 and the second nozzle 13. Further, the nozzle unit 11 includes a distal end side support portion 15 disposed at the distal end in the longitudinal direction and a proximal end side support portion 16 disposed at the proximal end in the longitudinal direction of the nozzle unit 11. The distal end portion of the nozzle connection tube 14 is supported by the distal end side support portion 15, and the proximal end portion of the nozzle connection tube 14 is connected to the center 16 a of the proximal end support portion 16 located on the axis 10 c of the main body 10. Yes. Further, the nozzle unit 11 includes a plurality of columnar members 17 extending between the distal end side support portion 15 and the proximal end side support portion 16, and includes a first nozzle 12, a second nozzle 13, and a nozzle connection tube 14. Is surrounded by a plurality of columnar members 17. Although not particularly illustrated, in this embodiment, it is assumed that four columnar members 17 are provided as an example. A more detailed structure of the nozzle unit 11 will be described later.

  As shown in FIG. 3, the main body 10 is provided with a connection mechanism 18 on the proximal end side of the main body 10 with respect to the nozzle unit 11, and paint is applied in the longitudinal direction of the main body 10 inside the connection mechanism 18. The connection mechanism portion coating material path 18a is formed so as to be able to pass along. The distal end portion of the connection mechanism 18 is detachably attached to the center 16 a of the base end side support portion 16 of the nozzle unit 11, and the connection mechanism portion paint path 18 a of the connection mechanism 18 communicates with the nozzle connection pipe 14 of the nozzle unit 11. It is possible. In addition, a connection mechanism section air path 18b connected to the connection mechanism section paint path 18a is formed inside the connection mechanism 18, and the connection mechanism section air path 18b is connected to the connection mechanism section paint path 18a. It is connected to the.

  In the main body 10, a motor 19 is disposed on the proximal end side of the main body 10 with respect to the connection mechanism 18, and the motor 19 is provided inside the motor 19 so that the paint can pass along the longitudinal direction of the main body 10. A part paint path (not shown) is formed. The front end of the motor 19 is attached to the base end of the connection mechanism 18, and the motor part paint path communicates with the connection mechanism part paint path 18 a of the connection mechanism 18. The motor 19 causes the connection mechanism 18 to rotate around the axis 10c of the main body 10 together with the slip unit 11, and as a result, the first nozzle 12 and the second nozzle 13 are centered on the axis 10c of the main body 10. Will rotate as.

  The main body 10 is provided with a paint supply pipe 20 for supplying paint. The paint supply pipe 20 extends from the base end portion of the motor 19 to the base end portion 10 b of the main body 10 and protrudes from the base end portion 10 b of the main body 10. A tip end portion of the paint hose 7 is detachably attached to the protruding portion of the paint supply pipe 20. Such a paint supply pipe 20 communicates the paint hose 7 and the motor part paint path of the motor 19. The main body 10 is provided with an air supply pipe 21 for supplying air. The air supply pipe 21 extends from the connection mechanism 18 to the base end portion 10 b of the main body 10 and protrudes from the base end portion 10 b of the main body 10. The tip of the air hose 8 is detachably attached to the protruding portion of the air supply pipe 21. Such an air supply pipe 21 communicates the air hose 8 and the connection mechanism portion air path 18 b of the connection mechanism 18.

  The main body 10 is provided with a plurality of elongated arms 22. A base end portion of the arm 22 is attached to the main body 10 so as to be pivotable, and the arm 22 is configured to be pivotable in the longitudinal direction of the main body 10 around the base end portion. In the basic posture of the arm 22, the longitudinal direction of the arm 22 is in a state perpendicular to the axis 10 c of the main body 10, and the arm 22 is biased so that it can return to the basic posture after turning. Yes. Further, the main body 10 is formed with a storage groove 23 extending in the vertical direction from the base end portion of the arm 22. When the arm 22 turns and assumes a posture along the main body 10, the arm 22 is configured to be stored in the storage groove 23 of the main body 10 (indicated by a virtual line in FIG. 3). .

  Here, the detail of the nozzle unit 11 is demonstrated with reference to FIG.3 and FIG.4. As shown in FIG. 3 and FIG. 4, the first nozzle 12 is disposed at a distance D in the longitudinal direction on the distal end side of the main body 10 with respect to the second nozzle 13, and the first nozzle 12 The nozzle 12 and the second nozzle 13 are accommodated in a region inside the outer periphery of the main body 10. As shown in FIG. 3, the first nozzle 12 is provided with a first ejection path 12 c that communicates between the distal end portion 12 a and the proximal end portion 12 b. The first ejection path 12c is disposed at an angle w1 to the base end side of the main body 10 with respect to a reference surface 10d perpendicular to the axis 10c extending in the longitudinal direction of the main body 10, and the first nozzle 12 is a paint Can be sprayed from the distal end portion 12a of the first nozzle 12 by tilting the angle w1 toward the base end side of the main body 10 with respect to the reference surface 10d. The second nozzle 13 is provided with a second ejection path 13c that communicates between the distal end portion 13a and the proximal end portion 13b. The second ejection path 13c is disposed at an angle w2 to the front end side of the main body 10 with respect to the reference surface 10d of the main body 10, and the second nozzle 13 allows the paint to be applied to the reference surface 10d. It is possible to spray from the tip portion 13a of the second nozzle 13 by tilting the angle w2 toward the tip side. It is preferable that the distance D between the first nozzle 12 and the second nozzle 13, the angle w1 of the first nozzle 12, and the angle w2 of the second nozzle 13 are adjustable.

  As shown in FIGS. 3 and 4, the nozzle connection pipe 14 is accommodated in a region inside the outer periphery of the main body 10. Such a nozzle connection pipe 14 is formed in a substantially crank shape at the distal end side connection section 14 a between the first nozzle 12 and the second nozzle 13, and the second nozzle 13, the proximal end support portion 16, and the like. The base end side connection section 14b is formed in a substantially crank shape. The base end portion 12b of the first nozzle 12 and the base end portion 13b of the second nozzle 13 are connected to the concave portion of the nozzle connecting pipe 14 as described above, and the first ejection path 12c and the second outlet passage 12c are connected to each other. The ejection path 13 c communicates with the nozzle connection pipe 14. The four columnar members 17 are arranged along the outer periphery of the main body 10 at intervals in the circumferential direction of the main body 10.

  With reference to FIG. 1 again, the guide device 3, the wire lifting device 4, the hose lifting device 6, and the control device 9 installed in the steel tower 100 will be described. The guide device 3 includes a guide portion 3a. The guide portion 3a includes the coating device 2, the wire 5, the paint hose 7, and the air hose 8, and the longitudinal direction thereof is set to the axis 101c of the column pipe 101. It is configured so as to be guided through the inside of the column tube 101 along the side. The guide device 3 includes a wire sheave 3b and a hose sheave 3c. An intermediate portion of the wire 5 is hung on the wire sheave 3b, and an intermediate portion of the paint hose 7 and the air are attached to the hose sheave 3c. An intermediate portion of the hose 8 is hung. The wire lifting device 4 includes a wire drum 4a, and the wire drum 4a is configured to wind and unwind the wire 5. The hose lifting device 6 includes a hose drum 6a. The hose drum 6a is configured to wind up and unwind the paint hose 7 and the air hose 8. The control device 9 is electrically connected to the coating device 2, the wire lifting device 4, and the hose lifting device 6, and can control the coating device 2, the wire lifting device 4, and the hose lifting device 6.

An in-pipe coating method according to an embodiment of the present invention will be described.
The installation method of the coating system 1 is demonstrated. The guide device 3 is installed at the upper end of the column tube 101, and the wire lifting device 4, the hose lifting device 6, and the control device 9 are installed on the stage 102. The intermediate portion of the wire 5 is hung on the wire sheave 3 b of the guide device 3, and the intermediate portion of the paint hose 7 and the intermediate portion of the air hose 8 are hung on the hose sheave 3 c of the guide device 3. The distal end portion of the wire 5 is attached to the base end portion 10b of the main body 10 of the coating apparatus 2, the distal end portion of the paint hose 7 is attached to the paint supply pipe 20 of the coating apparatus 2, and the distal end portion of the air hose 8 is attached to the coating apparatus 2. The air supply pipe 21 is attached. With the tip of the main body 10 of the coating apparatus 2 facing downward, the coating apparatus 2 is inserted through the opening 101a of the support column 101 while being guided by the guide portion 3a of the guide apparatus 3, and the lifting device 2 is supported by the support column. Hang inside 101. At this time, the wire 5, the paint hose 7, and the air hose 8 are also inserted and guided by the guide portion 3 a of the guide device 3.

  A method for moving the coating apparatus 2 will be described. The wire 5 is unwound from the drum 4 a of the wire lifting / lowering device 4, and the lifting / lowering device 2 suspended inside the column tube 101 is lowered inside the column tube 101. At this time, the paint hose 7 and the air hose 8 are unwound from the drum 6 a of the hose elevating device 6 according to the length of the wire 5 unwound from the wire elevating device 4 under the control of the control device 9. . Further, the wire 5 is wound up from the drum 4 a of the wire lifting / lowering device 4, and the lifting / lowering device 2 is raised inside the column tube 101. At this time, under the control of the control device 9, the paint hose 7 and the air hose 8 are wound on the drum 6 a of the hose lifting device 6 in accordance with the length of the wire 5 wound on the wire lifting device 4. .

  The passage through the flange hole 104 of the coating apparatus 2 will be described. When the axis 10 c of the main body 10 of the lifting device 2 is along the axis 101 c of the support pipe 101, a gap is formed between the tip of the arm 22 and the inner peripheral surface 101 b of the support pipe 101. In this state, the lifting device 2 can smoothly pass through the flange hole 104 of the column pipe 101. When the axis 10c of the main body 10 of the lifting device 2 swings in the horizontal direction with respect to the axis 101c of the column tube 101, the tip of the arm 22 comes into contact with the inner peripheral surface 101b of the column tube 101, whereby the lifting device 2 Is slightly displaced from the flange hole 104 of the column tube 101. The lifting device 2 slightly displaced from the flange hole 104 is called into the flange hole 104 by the substantially conical tip portion 10a of the main body 10 when lowered, and is flanged by the substantially conical base end portion 10b of the main body 10 when ascending. Called into the hole 104. When the lifting device 2 passes through the flange hole 104, the arm 22 rotates and falls and is received in the storage groove 23 of the main body 10, and after the lifting device 2 passes through the flange hole 104, the arm 22 assumes the basic posture. Return.

  A coating method using the coating apparatus 2 will be described. When the entire coating target region is located on the inner peripheral surface 101b of the support pipe 101, the lifting device 2 is raised or lowered to paint the intermediate portion between the first nozzle 12 and the second nozzle 13 of the lifting device 2. It arrange | positions in the height equivalent to the height direction intermediate part of an object area | region. In this arrangement state, the nozzle unit 11 is rotated by the motor 19, and the paint is supplied to the first nozzle 12 and the second nozzle 13 via the nozzle connection pipe 14 from the connection mechanism paint path 18a, and the connection mechanism. Air is supplied from the 18 connection mechanism part air path 18 b to the connection mechanism part paint path 18 a, and the paint is ejected from the rotated first nozzle 12 and second nozzle 13. The paint fired from the first nozzle 12 and the second nozzle 13 is sprayed onto the coating target area of the inner peripheral surface 101 b of the support pipe 101. Further, when the flange 103 of the column pipe 101 is included in the painting target region, the lifting device 2 is raised or lowered, and the intermediate portion between the first nozzle 12 and the second nozzle 13 of the lifting device 2 is set to the flange 103. Place it at the same height as. In this arrangement state, paint is ejected from the rotated first nozzle 12 and second nozzle 13. At this time, the paint fired from the first nozzle 12 inclined upward is sprayed to the lower surface of the flange 103 of the support pipe 101 and is fired from the second nozzle 13 inclined downward. The paint is sprayed on the upper surface of the flange 103. In addition, when the convex part and the recessed part are formed in the internal peripheral surface 101b of the support | pillar pipe | tube 101, the coating material injected from the 1st nozzle 12 inclined upwards is the lower area | region of a convex part, and a recessed part. The paint sprayed from the second nozzle 13 that is sprayed to the upper region and inclined downward is sprayed to the upper region of the convex portion and the lower region of the concave portion.

  As described above, according to the embodiment of the present invention, the entirety of the first nozzle 12 and the second nozzle 13 is disposed in a limited region inside the outer periphery of the main body 10, and such a main body The cross section of 10 can be made smaller than the cross section of the column pipe 101 of the steel tower 100. Therefore, the coating apparatus 2 can move reliably over the entire column tube 101. Further, even when a convex portion or a concave portion is formed on the inner peripheral surface 101b of the column pipe 101 of the tower 100, the lower region of the convex portion is formed by the first nozzle 12 that sprays the paint obliquely upward. Alternatively, the upper region of the concave portion is efficiently and uniformly coated, and the upper region of the convex portion or the lower region of the concave portion is efficiently and uniformly painted by the second nozzle 13 spraying the paint obliquely downward. It will be. Therefore, the inside of the column pipe 101 of the steel tower 100 in various forms can be efficiently and uniformly painted.

  According to the embodiment of the present invention, the entire nozzle connection pipe 14 is also disposed in a limited area inside the outer periphery of the main body 10 together with the first nozzle 12 and the second nozzle 13, as described above. The cross section of the main body 10 can be made smaller than the cross section of the column pipe 101 of the steel tower 100. Therefore, the coating apparatus 2 can move reliably over the entire column tube 101.

  According to the embodiment of the present invention, since the cross section of the main body 10 can be made smaller than the flange hole 104, the coating apparatus 2 can pass through the flange hole 104 with certainty. Therefore, the coating apparatus 2 can move reliably over the entire column tube 101. Further, the lower surface of the flange 103 is efficiently and uniformly coated by the first nozzle 12 spraying the paint diagonally upward, and the upper surface of the flange 103 is sprayed by the second nozzle 13 spraying the paint diagonally downward. Will be applied efficiently and uniformly. Therefore, the inside of the column pipe 101 of the steel tower 100 can be efficiently and uniformly painted.

  Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, as a modification of the present invention, the first ejection path 12c of the first nozzle 12 is inclined at an angle w1 toward the distal end side of the main body 10 with respect to a reference surface 10d perpendicular to the axis 10c extending in the longitudinal direction of the main body 10. The first nozzle 12 is capable of spraying the coating material from the front end portion 12a of the first nozzle 12 at an angle w1 inclined to the front end side of the main body 10 with respect to the reference surface 10d. The second ejection path 13c in the second nozzle 13 is disposed at an angle w2 to the base end side of the main body 10 with respect to the reference surface 10d of the main body 10, and the second nozzle 13 uses the paint as a reference. It may be possible to spray from the distal end portion 13a of the second nozzle 13 by tilting the angle w2 toward the proximal end side of the main body 10 with respect to the surface 10d. The same effect as the embodiment of the present invention can be obtained.

2 In-pipe coating equipment (painting equipment)
DESCRIPTION OF SYMBOLS 10 Main body 10c Axis 10d Reference surface 12 1st nozzle 13 2nd nozzle 14 Nozzle connection pipe 14a Tip side connection section 100 Steel tower 101 Support pipe 101b Inner peripheral surface 101c Axis 103 Flange 104 Flange hole w1, w2 Angle

Claims (3)

A main body formed in an elongated shape;
A nozzle provided on the main body, configured to spray paint, and configured to be rotatable about an axis extending along the longitudinal direction of the main body.
By rotating the nozzle and spraying the paint from the nozzle while being inserted along the longitudinal direction of the pipe into the pipe arranged along the height direction of the steel tower, the inside of the pipe In-pipe painting equipment that is configured to paint
Two nozzles are provided,
The two nozzles are spaced apart from each other in the longitudinal direction of the main body, and are housed in a region inside the outer periphery of the main body;
One of the two nozzles is oriented to spray the paint obliquely downward with respect to a reference plane perpendicular to the axis of the body when painting the interior of the tube;
The in-pipe coating apparatus, wherein the other of the second nozzles is oriented so as to spray the paint in an obliquely upward direction with respect to the reference plane when the inside of the pipe is painted. A nozzle connection pipe is provided for connecting the two nozzles and supplying the paint to the two nozzles;
The nozzle connecting pipe is formed in a substantially crank shape in a connecting section of the two nozzles, and is housed in a region inside the outer periphery of the main body;
The in-pipe coating apparatus of Claim 1 with which the base end part of the said nozzle is attached to the concave shaped part of the said nozzle connection pipe | tube. A flange extending from the inner periphery of the pipe toward the center of the pipe using the in-pipe coating apparatus according to claim 1, and a flange hole formed in the flange so as to penetrate in a longitudinal direction of the pipe An in-pipe coating method for coating the inside of the pipe having:
Moving the interior of the tube longitudinally through the flange hole of the tube through the in-pipe coating device;
By spraying the paint from one of the two nozzles in a state where one of the two nozzles of the in-pipe coating apparatus is disposed above the flange, the upper part of the flange is coated, Painting the lower part of the flange by spraying the paint from the other of the two nozzles with the other of the two nozzles disposed below the flange.

Images