JP2005111305A - Method and apparatus for coating inner surface of existing piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformly apply a liquid coating material to the inner surface of existing piping over an up and down direction. <P>SOLUTION: The support part 11 of a coating material impregnated body 10 is connected to one end of a piping inner revolving device 20 through a fixing connection part 23, and a traction wire 31 is connected to the other end of the piping inner revolving device 20 through a rotary support part 24. The piping inner revolving device 20 having wheel parts 22 obliquely arranged with respect to the axis O of the piping 2 is drawn while revolved by drawing the traction wire 31 to move the coating material impregnated body 10 while revolving the same around the axis O. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an existing pipe inner surface coating apparatus and a coating method for forming a thin layer of a coating material on the inner surface of an existing pipe.

  In the maintenance process for existing pipes such as gas, water and sewerage, a process for applying a liquid coating material to the inner surface of the existing pipes is required for various purposes. For example, when resin lining is applied to the inner surface for repairing an existing pipe, in order to improve the adhesion between the inner surface of the existing pipe and the lining film, the base material ( (Primer) is applied. In some cases, the inner surface is painted to prevent rust at the beginning of laying the pipe.

  As a coating material used in such a process, generally, there are many liquid materials having a low viscosity, and the coating method is performed by spraying with a spray gun, for example, as shown in Patent Document 1 below.

JP 2001-87706 A paragraph 0017

  Usually, when a liquid coating material is applied to the inner surface of a pipe, it becomes a problem that the layer thickness differs between the upper part and the lower part of the existing piping due to the liquid dripping after the application. In the case of spraying with a simple spray gun, the applicable coating material is limited to a material having a high immediate curing property. In addition, a spray gun nozzle device may not be inserted into a small diameter pipe having a diameter of 150 mm or less. In addition, as a base material, a filler may be mixed in the coating material. However, for such a coating material, since the nozzle is clogged, the application by the spray gun as described above is employed. I can't.

  In addition, there is a construction method for applying the inside of the pipe by flowing the coating material in the existing pipe using pressure or air blowing, but for a pipe having a small diameter and a long extension (about 50 m or more), There is a problem in terms of workability because a large-capacity pressurizing means or blowing means is required.

  Furthermore, in the method of flowing such a coating material and the spraying method using the spray gun described above, a surplus exceeding the coating amount necessary for forming a thin layer is generated in large quantities, so that the coating contains an organic solvent. When using materials, there is a problem that it is necessary to ensure safety, such as sufficient ventilation at the enforcement site.

  This invention makes it a subject to provide the existing piping inner surface coating device or the coating method for coping with such a problem. In other words, when applying a liquid coating material to the inner surface of an existing pipe, it is possible to apply uniformly over the top and bottom, and it is possible to perform construction regardless of the type of coating material. It can be applied to any coating material, and can be applied regardless of the diameter or length of the tube. In particular, even with a small diameter and long extension, uniform application is possible over the entire circumference. Further, it is an object of the present invention that construction can be performed without generating excessive coating material.

  In order to achieve such an object, an existing pipe inner surface coating apparatus or coating method according to the present invention has the following configuration.

  The first is a coating apparatus that forms a thin layer of coating material on the inner surface of an existing pipe, and a coating material-impregnated body impregnated with a liquid coating material and a support portion of the coating material-impregnated body are fixed to one end. An in-pipe swivel device that turns inside the tube by towing from the other end side, a traction line having a tip connected to the other end side of the in-pipe swivel device via a rotation support portion, and the other It is characterized by comprising traction means for traction toward the end side.

  Second, in the above-described existing pipe inner surface coating apparatus, the in-pipe swivel tool includes a plurality of wheels urged so as to abut on the inner surface of the pipe, and the wheels are identical to the axis of the pipe. In addition to being disposed in a slanted direction, the wheel surface is treated so as to increase the frictional force with the inner surface of the tube so as to be able to rotate without sliding the inner surface of the tube.

  Third, there is a coating method for forming a thin layer of coating material on the inner surface of an existing pipe, the step of impregnating the coating material with the coating material, and inserting the coating material-impregnated body from one end of the existing pipe And a step of pulling the coating material-impregnated body toward the other end of the existing pipe while turning the coating material-impregnated body.

  Fourth, in the above-described existing pipe inner surface coating method, the spiral swivel is performed by an in-pipe swivel that is rotatably supported at the tip of a traction line and rotates by traction.

  Fifth, in the above-described existing pipe inner surface coating method, the coating material is a base agent that is applied prior to the inner surface resin lining of the existing pipe.

  According to such a feature, it is possible to apply the liquid coating material to the inner surface of the pipe while turning the coating material impregnated body impregnated with the coating material. Since the accumulated coating material can be continuously conveyed upward by the rotation of the coating material impregnated body, a uniform thin layer can be applied to the upper and lower portions of a long extension pipe.

  In addition, the coating material-impregnated body can be impregnated without any choice as long as it is a liquid coating material, and the coating material-impregnated body can also be a coating material containing aggregates such as fillers. It can be applied in a state where the aggregate is adhered to.

  For example, by appropriately setting the outer diameter of the coating material-impregnated body and the swivel tool in the pipe, uniform coating on the inner surface of the pipe is possible regardless of the diameter and length of the pipe. Furthermore, since the coating material impregnated body can be impregnated with a coating material necessary and sufficient to form a thin layer in the pipe, a large amount of surplus is not generated in the construction pipe, and an organic solvent, etc. Even a coating material containing can be safely operated.

  Further, in the in-pipe swivel device in the existing pipe inner surface coating apparatus of the present invention, the plurality of wheels biased so as to abut on the pipe inner surface are inclined in the same direction with respect to the axis of the pipe, and The wheel surface is treated to increase the frictional force with the inner surface of the tube so that it can rotate without slipping on the inner surface of the tube. There is no need to introduce a drive device for turning the device, the weight of the device can be reduced, and the handleability during construction is also good.

  And, by applying a coating method using such an existing pipe inner surface coating apparatus, a base layer of a resin lining that repairs the inner surface of the existing pipe is formed, so that a uniform base agent is applied to the upper and lower sides of the pipe inner surface. Thus, an effective resin lining film can be formed on the entire surface of the pipe.

  According to the existing pipe inner surface coating apparatus and the coating method having such a configuration, when applying a liquid coating material to the existing pipe inner surface, uniform coating can be performed vertically, and the type of the coating material can be changed. Any construction is possible. In particular, the present invention is applicable to coating materials mixed with aggregates such as fillers. Further, the present invention can be applied regardless of the caliber or length of the pipe, and is particularly applicable to a small caliber and a long extension. Furthermore, construction is possible without generating excessive coating material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a main part of an existing pipe inner surface coating apparatus according to an embodiment of the present invention. A coating apparatus 1 according to an embodiment of the present invention includes a coating material impregnated body 10, an in-pipe swivel tool 20, and a traction means 20.

  The coating material impregnated body 10 can be impregnated with a liquid coating material such as a cloth material or a sponge material, and is mounted around the support portion 11. As the form, various forms are possible, such as one in which a plurality of string-like members are bundled on the support part 11 or one end of a plurality of pieces projecting radially is attached to the support part 11. Moreover, the connection part 11a is formed in the edge part by the side of the in-tube swivel tool 20 of the support part 11. As shown in FIG.

  The in-pipe swivel tool 20 is composed of a main body portion 21 arranged along the axis of the pipe 2 and a plurality of wheel portions 22 arranged on the outer periphery thereof. Each wheel portion 22 is supported by a wheel 22a, and is provided with a mechanism that urges all the wheels 22a by a spring or the like so as to abut against the inner surface of the pipe with a predetermined pressure. Further, the wheel 22a is subjected to a surface treatment for increasing the frictional force with the contact surface so that the wheel 22a can rotate without sliding on the inner surface of the tube.

  And the fixed connection part 23 is provided in the edge part by the side of the coating material impregnation body 10 of the main-body part 21, The connection part 11a by the side of the coating material impregnation body 10 is connected with this fixed connection part 23. FIG. Further, a rotation support portion 24 is provided at the other end portion of the main body portion 21.

  The traction means 30 pulls the traction line 31 in the arrow direction. A connecting portion 31 a connected to the rotation support portion 24 described above is provided at the tip of the traction line 31.

  In such a coating apparatus 1, when inserted in the pipe 2, the wheel 22 a of the in-pipe swivel tool 20 is inclined in the same direction with respect to the axis O of the pipe 2 and is pulled by the pulling means 30. As a result, the traction force is converted into a force for turning the in-pipe swivel tool 20, so that the in-pipe swivel tool 20 moves in the pulling direction while turning by itself.

  And since the connection part 31a in the front-end | tip of the traction line 31 and the main-body part 21 in the in-pipe swivel tool 20 are connected via the rotation support part 24, with respect to turning of the in-pipe swivel tool 20, it returns from the traction line 31. Is possible. Further, since the main body portion 21 of the in-pipe swiveling tool 20 and the support portion 11 of the coating material impregnated body 10 are connected by the fixed connecting portion 23, the swirling tool 20 turns the coating material-impregnated body 10 at the axis O. Can be swiveled around.

  When the coating material impregnated body 10 is swung around the axis O in a state where the coating material impregnated body 10 is impregnated with the liquid coating material, the outer peripheral portion of the coating material impregnated body 10 contacts the inner surface of the pipe 2. Thus, a thin layer is formed while sliding in a spiral. In addition, since the coating material included in the vicinity of the center of the coating material impregnated body 10 moves to the outer peripheral portion of the coating material impregnated body 10 by the action of centrifugal force accompanying swirling, the coating material impregnated in the coating material impregnated body 10 The material is sequentially supplied to the outer peripheral portion and used for forming a thin layer on the inner surface of the pipe 2. Therefore, if the coating material impregnated body 10 is impregnated with a necessary and sufficient coating material, this is successively used for forming a thin layer, so that no excessive coating material is generated.

  Drawing 2 is an explanatory view explaining the existing pipe inner surface application method using application device 1 concerning an embodiment of this application. First, both ends of the existing pipe 2 to be enforced are opened in the excavation work parts A and B. Then, after impregnating the coating material impregnated body 10 with the liquid coating material, the coating material impregnated body 10 is inserted into the piping 2 from one end side (excavation work part A side) of the piping 2. Then, in a state where the connecting portion 11a of the coating material impregnated body 10 and the fixed connecting portion 23 of the in-pipe swivel tool 20 are connected, and the rotation support portion 22 of the in-pipe swiveling tool 20 and the connecting portion 31a of the traction line 31 are connected. The traction line 31 is pulled toward the other end side (excavation work part B side) by a traction machine 34 through the traction support parts 32 and 33. As a result, the swiveling action of the in-pipe swivel tool 20 described above works, and the coating material impregnated body 10 moves from one pipe end toward the other pipe end while swiveling around the axis O of the pipe 2. In normal coating, the coating material that accumulates downward due to gravity can be continuously transported upward by the rotation of the coating material impregnated body 10, so that the coating material is also present on the upper and lower sides of the inner surface of the long extension pipe 2. A uniform thin layer of coating material can be formed on the inner surface of the tube without bias.

  As an example of construction using such an existing pipe inner surface coating apparatus and coating method, there can be mentioned a base layer forming process to be constructed as a pretreatment of a resin lining process employed for pipe repair or the like. In this case, as the base material (primer), a material such as metal or concrete that improves the adhesiveness between the inner surface of the pipe and the lining material is adopted, but various kinds of materials are used depending on the relationship between the piping material and the material of the lining material. Things are used. In the embodiment of the present invention, a liquid base material having a relatively low viscosity that can be easily impregnated into the coating material impregnated body 10 is suitable. In addition, the present invention can be applied to those in which an aggregate such as a filler is mixed and cannot be applied by a spray gun.

  According to the existing pipe inner surface coating apparatus and coating method of such an embodiment, when applying a liquid coating material to the existing pipe inner surface, uniform application is possible over the top and bottom, and the type of coating material It is possible to apply without any choice, and is particularly applicable to coating materials mixed with fillers.

  Further, the present invention can be applied regardless of the diameter or length of the pipe, and even when the diameter is small and the length is extended, a traction force is applied in consideration of the movement resistance in the pipe of the coating material impregnated body 10 and the pipe turning tool 20. This is applicable. Furthermore, since the construction can be performed without generating an excessive coating material, the work can be performed safely even when an organic solvent-based coating material is used. Further, since the traction force is used for the turning drive, there is no need to insert a drive device in the pipe, and the device can be lightened and simplified.

It is explanatory drawing which shows the principal part of the existing piping inner surface coating apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the existing piping inner surface application | coating method which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Application | coating apparatus 2 Piping 10 Coating material impregnation body 11 Support part 11a Connection part 20 In-pipe turning tool 21 Main body part 22 Wheel part 22a Wheel 23 Fixed connection part 24 Rotation support part 30 Towing means 31 Tow line 31a Connection part 32,33 Tow support Part 34 Traction machine

Claims (5)

A coating device for forming a thin layer of coating material on the inner surface of an existing pipe,
A coating material impregnated body impregnated with a liquid coating material, a support part of the coating material impregnated body is fixed to one end, and a swiveling tool in the tube that is swung in the pipe by pulling from the other end side; An existing pipe inner surface coating apparatus comprising: a traction line whose tip is connected to the other end side of the traction line via a rotation support portion; and traction means for traction the traction line toward the other end side.   The in-pipe swivel device includes a plurality of wheels biased so as to abut on the inner surface of the pipe, and the wheels are inclined in the same direction with respect to the axis of the pipe and slide on the inner surface of the pipe. The existing pipe inner surface coating apparatus according to claim 1, wherein the wheel surface is treated so as to increase a frictional force with the inner surface of the pipe so as to be able to rotate. A coating method for forming a thin layer of coating material on the inner surface of an existing pipe,
The step of impregnating the coating material impregnated body with the coating material, the step of inserting the coating material impregnated body from one end of the existing pipe, and pulling toward the other end of the existing pipe while turning the coating material impregnated body An existing pipe inner surface coating method comprising the steps of:   4. The existing pipe inner surface coating method according to claim 3, wherein the spiral swivel is performed by an in-pipe swivel that is rotatably supported at a tip of a pulling line and rotates by pulling.   5. The existing pipe inner surface application method according to claim 3, wherein the coating material is a base material that is applied prior to an inner surface resin lining of the existing pipe.

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