JP2010209967A - Pipe protective cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To leave no odor in a pipe. <P>SOLUTION: This pipe protective cap 10 mounted to the pipe end of the pipe (p) with solvent-based coating applied to the pipe inner surface, includes an adsorbent containing part 20 facing the internal space of the pipe (p) mounted to the pipe (p). The adsorbent containing part 20 has a function of adsorbing a volatile component of a coating material used for the solvent-based coating. Since the adsorbent containing part 20 has the function of adsorbing the volatile component of the coating material used for the solvent-based coating, odor in the pipe can be eliminated without enlarging the holes of the pipe protecting cap 10 or increasing the number of holes. If the odor can be eliminated, the holes of the cap can be made small, the number of the holes can be reduced, or the holes themselves can be eliminated. A function of suppressing the intrusion of foreign matter into the pipe can thereby be exhibited. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cap for protecting a tubular body that is fitted to an end of a tubular body that has been coated with a pipe inner surface.

  Various coatings are applied to the inner peripheral surfaces of various pipes used in waterworks and sewers in order to protect the inner surfaces. In particular, cast iron pipes and the like are often coated with a pipe inner surface by mortar lining or powder coating (for example, epoxy resin powder coating) for protection.

  In these pipe bodies, caps for protecting the pipe body made of synthetic resin are fitted to both ends of the pipe body in order to avoid fouling and deterioration of the pipe inner surface coating during transportation and storage. This has been done conventionally.

  In particular, in a pipe body that has been powder-coated as a pipe inner surface coating, the coated surface of the pipe inner surface may be deteriorated by light inserted from the end of the pipe. It is important to close both ends of the body tube with tube protection caps.

  As shown in FIG. 5, this type of tubular body p generally has one end in the tube axis direction with the insertion port 2 and the other end adjacent to each other with a straight tube portion 4 having a constant tube diameter in the tube axis direction. It is the receiving port 3 which can receive the insertion port 2 of the other tubular body p in the inner side.

  For this reason, for example, as shown in FIG. 6, the cap 1 is fitted into the pipe outer surface 2 b at the end of the insertion port 2, which is the end on the narrow side of the pipe p, and has a diameter of The receiving port 3 which is the end portion on the thick side is fitted to the tube inner surface 3a at the end portion (see, for example, Patent Document 1).

  In the tubular body p described above, the tube inner surface 3a has a large number of irregularities in the portion close to the receiving port 3 in the covering range of the tube inner surface. This unevenness corresponds to the shape of the packing, lock ring or the like used when receiving the insertion opening 2 of the adjacent tubular body p, or the outer shape of the insertion opening 2 itself.

In general, the inner surface of the receiving port 3 is coated with a solvent-based paint (hereinafter, “solvent-based coating”). That is, powder coating as primary coating is performed on the pipe inner surface 4a of the straight pipe portion 4 (including the pipe inner surface 2a of the insertion port 2), and thereafter, the pipe inner surface 3a in the vicinity of the receiving port 3 with many irregularities is formed on the pipe inner surface 3a. Solvent-based coating is performed as the next coating.
The epoxy resin powder coating range is defined in JWWA G 112 (Japan Waterworks Association Standard).

It is necessary to remove the odor of the solvent-coated portion at the time of shipment of the pipe body. If the volatilized solvent remains in the tube, the tube is saturated with the volatile solvent, which may hinder further volatilization of the solvent from the coating film. If it becomes like this, a coating film cannot fully be hardened.
With regard to this point, for example, with regard to a cast iron pipe for water supply, it is said that there is no problem with odor at the time of shipment in the Japan Water Works Association Standard JWWA K139.
In addition, regarding removal of this odor, the same is required even when a paint other than the solvent-based paint, for example, a water-based paint is used.

  Therefore, for example, as shown in FIGS. 6 (a) and 6 (b), the bottom of the cap 1 is drilled so that the volatile solvent that causes these odors can be discharged outside the pipe. A 10 mm hole 6 is made. If there is a hole 6 in the cap 1, the volatile solvent can escape to the outside of the pipe through the hole 6, and odor residue can be suppressed.

Utility model registration No. 3099749

  Thus, in order to smoothly discharge the volatilized solvent and the like to the outside of the tube, it is preferable that the hole 6 provided in the cap 1 for protecting the tube body has a cross-sectional area as large as possible.

  However, in the cap 1 shown in FIGS. 6 (a) and 6 (b), if the size of the hole 6 (cross-sectional area of the hole 6) is made larger than this, it is not preferable because foreign matter enters the entire pipe. In addition, increasing the number of holes 6 or increasing the size of the holes 6 leads to an increase in the amount of light entering the tube, and therefore, particularly when powder coating is applied to the tube inner surface 4a of the straight tube portion 4. Is concerned about its impact on powder coating.

  Accordingly, an object of the present invention is to prevent odors from remaining in the pipe when coating the inner surface of the pipe of the receiving port.

  In order to solve the above-mentioned problems, the present invention includes an adsorbent containing a tube end coated with a tube inner surface or a tube end of the tube, and facing the space in the tube in a state of being attached to the tube. The adsorbent-containing part has a function of adsorbing a volatile component of the paint used for coating the inner surface of the pipe, and employs a cap protecting pipe structure.

  According to this method, since the adsorbent-containing part has a function of adsorbing the volatile components of the paint used for painting the inner surface of the pipe, the hole for the cap for protecting the tube body is enlarged or the number of holes is increased. It is possible to remove the odor in the pipe without increasing the amount. Moreover, if the odor can be removed, the cap hole can be reduced or reduced, or the hole itself can be eliminated, so that the function of suppressing the entry of foreign matter into the tube can be exhibited. .

  In the cap provided with the adsorbent-containing part, for example, an aspect in which the adsorbent-containing part is provided in a part of the cap or an aspect in which the entire cap is configured by the adsorbent-containing part may be employed. Good.

Furthermore, as a structure of these adsorbent containing parts, for example, an adsorbent may be molded into a necessary shape as it is.
Further, as other configurations, for example, a configuration in which an adsorbent is attached to paper, fiber, wood, or resin, or a configuration in which an adsorbent component is applied or impregnated into paper, fiber, wood, or resin is formed. The configuration can be adopted. In addition, as a raw material of an adsorbent, activated carbon, a zeolite, etc. are employable, for example.

Further, the paper, fiber, wood, or resin can be a material formed in a sheet shape.
Since the sheet-like material is thin, the amount of adsorbent adhering, the amount of adsorbent component applied, and the amount of impregnation per unit volume of the material are lower than those of other shapes such as blocks and blocks. You can expect relatively much. For this reason, it is effective in removing odors.

  Furthermore, as the configuration of the cap, similarly, the paper, fiber, wood or resin formed into a sheet is wound into a roll to form a columnar member or a cylindrical member, and the columnar member or cylindrical By extruding the portion closer to the inner diameter of the member to one side in the axial direction of the roll, the one end surface in the axial direction of the columnar member or cylindrical member is gradually moved from the outer diameter side toward the inner diameter side. The structure formed in the step shape which a protrusion amount increases can be employ | adopted.

  Since the material is in the form of a sheet, it is possible to expect a relatively large amount of adsorbent adhesion, adsorbent component application amount, and impregnation amount per unit volume of the material. Furthermore, by making the end surface stepped, the stepped end surface can be easily fitted to the inner edge of the tube end portion of the tube, the inner surface of the tube, or a step formed in the tube. This is because the stepped end face can exhibit the same effect as the tapered face.

  In addition, in order to maintain the material in the above-described columnar shape or cylindrical shape and the shape having the above-described stepped end face, the sheet-like materials overlapping in the radial direction of the roll are fixed so as not to move. An adhesive or the like may be used as appropriate.

Moreover, the cap which consists of these each structure can be made into the following aspects, for example.
That is, the tube body has a receiving port at one end in the axial direction across the straight tube portion, and has an opening at the other end, the inner surface of the tube is coated on the inner surface of the receiving port, and the cap is It can be set as the structure fitted and attached to the pipe end part by the side of the said receiving end of a pipe.

  As another aspect, the tubular body has a receiving port at one end in the axial direction with a straight tube portion sandwiched between the other end, and the inner surface of the tube is painted on the inner surface of the receiving port. And the cap is fitted and attached to a step portion at the boundary between the inner surface of the receiving port and the inner surface of the straight pipe portion of the tube body, and the adsorbent-containing portion faces the space in the receiving port in the mounted state. can do.

  Further, when the cap is fitted and attached to the step portion at the boundary between the inner surface of the receiving port and the inner surface of the straight pipe portion, the cap is fitted to the step portion at the boundary between the inner surface of the receiving port and the inner surface of the straight pipe portion. A cap different from the cap provided with the adsorbent-containing portion is attached to the tube end portion on the receiving side of the tube body, and the cap side of the tube body is attached by the other cap. It can be set as the structure which obstruct | occluded the edge part. Of course, another cap can be attached to the tube end on the insertion port side.

  In the present invention, since the cap attached to the pipe end of the pipe body or in the pipe is provided with an adsorbent-containing part having a function of adsorbing the volatile components of the paint used for coating the inner surface of the pipe, The odor in the tube can be removed without enlarging the holes or increasing the number of holes.

Sectional drawing which shows one Embodiment The cap of the embodiment is shown, (a) is a state in the middle of winding a sheet-like material, (b) is a state where the winding is finished, (c) is a state in which the end surface is projected in a step shape. Each perspective view shown (A) and (b) are perspective views of the cap attached to the pipe end. Other embodiments are shown, (a) is a sectional view, (b) is a perspective view of a cap, and (c) is a perspective view showing a modification of (b). Cross-sectional view showing the division of coating on the tube (A) is sectional drawing of a prior art example, (b) is a perspective view of a cap.

  Embodiments of the present invention will be described with reference to the drawings. In this embodiment, when pipe inner surface coating is performed on a pipe body (cast iron pipe) p used for waterworks or the like, the pipe inner surface coating drying method and the pipe body protection used for the pipe inner surface coating drying method are described. This relates to the cap 10 for use.

(First embodiment)
As shown in FIG. 1, the pipe body p is provided with an insertion port 2 at one end shown on the right side in the drawing and a receiving port 3 at the other end shown on the left side with a straight pipe portion 4 having a constant inner and outer diameter. .

  In this embodiment, as in the case of the conventional example, as shown in FIG. 5, after predetermined coating (outer surface coating) is performed on the outer surface of the tubular body p, powder is applied to the portions indicated by reference numerals B and C. Paint (primary coating). As this powder coating, for example, epoxy resin powder coating can be adopted. In this embodiment, the coating thickness of the primary coating is 150 μm or more at the portion indicated by the symbol B, and 300 μm or more at the portion indicated by the symbol C.

Thereafter, solvent-based coating (secondary coating) is applied to the tube inner surface 3a at the tube end portion on the side of the receiving port 3 indicated by symbol A. As this solvent-based coating, for example, an epoxy resin paint can be employed. In this embodiment, the coating thickness of the secondary coating is 60 μm.
In addition, as shown in the drawing, a portion of the inner surface of the receiving port 3 that has been subjected to solvent-based coating indicated by symbol A and a portion that has been subjected to powder coating indicated by symbol B are partially overcoated. It has been broken.

  Thereafter, the tube body p is transferred to a drying process, and the painted surface is dried by primary coating and secondary coating on the inner surface of the tube.

  Furthermore, after the drying, the pre-shipment coating is performed on the pipe inner surface 3 a of the receiving port 3. Specifically, the inner surface of the receiving port 3 is cleaned by air blowing or the like, and then a solvent-based paint is applied to the portion indicated by the symbol D (in this embodiment, the portion indicated by the symbols A and B). , And pre-shipment painting. As the solvent-based coating in the pre-shipment coating, for example, an acrylic resin coating can be employed. In this embodiment, the coating thickness is 20 μm.

  By this pre-shipment coating, the part indicated by the reference sign D, that is, the part indicated by the reference sign A and the reference sign B becomes the solvent-based coating, and the part indicated by the reference sign C becomes the part subjected to powder coating.

  Then, after the pre-shipment coating is completed, as shown in FIG. 1, two caps 1 and 10 are fitted on the receiving port 3 side, and one cap 1 is fitted on the insertion port 2 side. The cap 1 on the side of the insertion opening 2 is the same as that of the conventional example and will not be described.

  As shown in FIG. 3A, the cap 1 on the receiving port 3 side is fitted and attached to the inside of the end edge at the tube end portion on the receiving port 3 side.

The cap 1 only needs to close the end of the tubular body p on the receiving port 3 side.
That is, the cap 1 on the receiving port 3 side is a concave body 16 having a main body portion 14 having a tapered surface 11 on the outer periphery and a bottom portion 15 that closes one end surface of the main body portion 14, and the outer shape thereof is a truncated cone shape. Is used. However, the hole 6 provided in the bottom 15 may be omitted depending on circumstances.
In addition, for example, a block-shaped cap 1 having no hollow portion as shown in FIG. The material is made of resin, but is not particularly limited to resin.

  The cap 10 fitted and attached to the step portion 5 at the back of the receiving port 3 uses a material s made of sheet-like cardboard (paper) impregnated with an activated carbon component having a function as an adsorbent. , It is arranged in the shape of the cap 10.

  As shown in FIG. 1, the configuration of the cap 10 includes a portion having a cylindrical surface 22 on its outer periphery and a stepped portion 21 that gradually decreases in diameter on one axial direction of the cylindrical surface 22. Further, the end surface on one end side in the axial direction of the stepped portion 21 is a flat portion 23 having a surface direction orthogonal to the axial direction. In addition, the end surface of the other end side in the axial direction of the cylindrical surface 22 is recessed in a concave shape, and the inner surface of the concave portion has a stepped shape that gradually decreases in diameter toward one side in the axial direction. The gradient is the same as the stepped portion 21.

  The manufacturing method of the cap 10 will be described. As shown in FIG. 2A, a material s made of a corrugated cardboard sheet impregnated with an activated carbon component is formed into a strip shape, and the strip-shaped material s is wound into a roll shape to form a cylindrical shape. Let it be member R. At this time, a gap may be provided in the center of the roll to form a cylinder, or as shown in FIG.

A portion closer to the inner diameter of the columnar member (or the cylindrical member may be pushed out) in one axial direction of the roll as indicated by an arrow E in FIG. By this extrusion, the end surface on one axial side of the columnar member R is gradually projected toward the one side in the axial direction from the outer diameter side to the inner diameter side while maintaining the cylindrical surface 22 on the outer periphery of the columnar member R. It can be set as the step part 21 which quantity increases.
In this embodiment, the end face on one side in the axial direction of the stepped portion 21 is the flat portion 23. However, a configuration is also possible in which the flat portion 23 is not provided by being pushed out to the vicinity of the center of the roll. It is done.

As shown in FIG. 1, the cap 10 is fitted and attached to a step portion 5 at the boundary between the inner surface of the receiving port 3 and the inner surface of the straight pipe portion 4 of the pipe body p.
Since the entire cap 10 contains a component of activated carbon, that is, an adsorbent-containing portion 20 having a function of adsorbing a volatilized solvent, the adsorbent-containing portion 20 faces the space in the receiving port 3, and The component volatilized from the solvent-based paint applied to the inner surface of the receiving port 3 can be adsorbed.

  Further, since the cap 10 has the stepped portion 21, the stepped portion 21 can be fitted into the stepped portion 5 provided at the back of the receiving port 3 so that the cap 10 cannot be easily detached. . Further, the stepped portion 21 exhibits the same effect as that of the tapered surface, and the degree of adhesion increases because the stepped portion 21 contacts the stepped portion 5 over the entire circumference.

  In the first embodiment, the adsorbent-containing unit 20 having another configuration may be employed.

  For example, after adhering activated carbon to the cardboard or paper other than corrugated cardboard, or applying or impregnating a component of activated carbon, the material fits closely to the step portion 5 of the tube p. The adsorbent-containing part 20 (cap 10) molded into a predetermined shape can be employed. Alternatively, fibers, wood, or resin may be used instead of paper. Further, the entire cap 10 may be activated carbon.

The entire cap 10 may not be the adsorbent-containing portion 20 but a part of the cap 10 may be the adsorbent-containing portion 20. For example, what adsorb | sucked the adsorbent containing part 20 which consists of said each aspect to the member which consists of arbitrary raw materials which have the shape which can be fitted and fixed to the step part 5 in the said tubular body p can be considered.
At this time, since the solvent-based coating is applied to the inner surface of the receiving port 3 of the tubular body p, the adsorbent-containing portion 20 is fixed to the member so as to face the space in the receiving port 3.

(Second embodiment)
A second embodiment is shown in FIG. The cap 10 of this embodiment has an adsorbent-containing portion 20 attached to the bottom 15 of a concave body 16 similar to that shown in the first embodiment. Since the structure of the tubular body p is the same as that of the first embodiment, the description thereof is omitted.

  The cap 10 has a hole 13 in the center of the bottom 15 thereof. The hole 13 penetrates the bottom 15 on the front and back.

  The adsorbent containing part 20 molded in a block shape is assigned to the outer surface of the bottom part 15, and the split pin 24 is inserted into the hole 20a provided in the adsorbent containing part 20 and the hole 13 of the bottom part 15 (FIG. 4). (See (b)). As the adsorbent-containing part 20, for example, a sheet-shaped paper impregnated with an activated carbon component wound into a cylindrical shape can be employed as in the cylindrical member in the above-described embodiment.

  The split pin 24 can be fixed in a state in which both ends 24a, 24a are separated into two and spread in opposite directions. For this reason, as shown to Fig.4 (a), the concave-shaped body 16 and the adsorption agent containing part 20 can be integrated.

  In this embodiment, the split pin 24 is used for the integration of the concave body 16 and the adsorbent-containing portion 20. However, as the fixing means, other than that, a wire, a string, an adhesive, etc. can be adopted. .

  In the second embodiment, the adsorbent-containing unit 20 having another configuration may be employed.

  For example, as shown in FIG. 4 (c), a sheet-like paper impregnated with an activated carbon component is used, and the fold and valley folds are alternately repeated along the parallel folds. After making a plate-like member and binding the central part of the corrugated plate-like member (the central part in the direction in which the ridgeline of the wave extends) with a number line, it is expanded into a fan shape or the circular shape shown in the figure, and then the concave body described above This is a method of fixing to the bottom 15 of 16. For fixing to the bottom portion 15, an arbitrary one such as a wire 25 or an adhesive can be used in addition to the split pin 24.

  Also in this second embodiment, for example, using corrugated cardboard or paper other than corrugated cardboard, after adhering activated carbon to them, or after applying or impregnating a component of activated carbon, the material, It may be fixed to the concave body 16. Alternatively, fibers, wood, or resin may be used instead of paper. Furthermore, instead of the concave body 16, a block-shaped member having no hollow portion may be employed. The entire cap 10 may be activated carbon.

  Note that the cap 10 shown in the first embodiment may be used and fixed by fitting the cap 10 to the tube end of the receiving port 3. At this time, the outer diameter of the cap 10 matches the inner diameter of the receiving port 3, and the tube p is attached to the receiving port 3, and there is no hole so that the tube end can be closed, Alternatively, it is desirable that the holes have a number and size that can prevent entry of foreign matter even if there is a hole.

As described above, the activated carbon component intervening in the adsorbent-containing portion 20 can adsorb the solvent volatilized from the portion D (D = A + B) subjected to the solvent-based coating by the pre-shipment coating of the pipe body p, Since no odor remains in the cap, it is not necessary to provide a hole in the cap, and an effect of preventing the entry of foreign matter into the pipe can be expected.
Furthermore, since it is not necessary to provide a hole in the cap, it is possible to suppress the intrusion of light from the outside of the tube into the portion C on which the powder coating is applied. By suppressing the intrusion of light, it is possible to avoid deterioration of the painted surface of the powder coating.

In addition, the tubular body p which can employ | adopt the cap 10 for tubular body protection by this invention is not limited to the above-mentioned embodiment, It can use also with respect to the tubular body p which has another cross-sectional shape.
In each of the above embodiments, activated carbon is used as the material constituting the adsorbent-containing unit 20, but other materials can be used instead of or in addition to the activated carbon as long as the material has a function of adsorbing the volatilized solvent. May be used. For example, zeolite can be used.

DESCRIPTION OF SYMBOLS 1,10 Cap 2 Insertion port 3 Receiving port 4 Straight pipe part 6,13,20a Hole 11 Tapered surface 14 Main body part 15 Bottom part 16 Concave body 20 Adsorbent containing part 21 Stair-like part 22 Cylindrical surface 24 Split pin 25 Line p pipe body

Claims (8)

  Adsorbent containing part (20) attached to the pipe end or pipe of the pipe (p) whose inner surface is coated and facing the space in the pipe (p) in the state of being attached to the pipe (p). ), And the adsorbent-containing part (20) has a function of adsorbing the volatile components of the paint used for painting the inner surface of the pipe.   The cap (10) for protecting a tubular body according to claim 1, wherein the cap (10) is entirely composed of the adsorbent-containing part (20).   The adsorbent-containing part (20) is formed by adsorbing an adsorbent on paper, fiber, wood or resin, or by applying or impregnating an adsorbent component on paper, fiber, wood or resin. Cap (10) for protecting a tubular body according to claim 1 or 2, characterized in that   The cap (10) for protecting a tubular body according to claim 3, wherein the paper, fiber, wood or resin is formed into a sheet shape.   The cap (10) is formed by rolling the paper, fiber, wood, or resin formed in a sheet shape into a roll shape to form a columnar member or a cylindrical member, and close to the inner diameter of the columnar member or the cylindrical member. By extruding this part in one axial direction of the roll, the amount of protrusion of the cylindrical member or cylindrical member in one axial direction gradually increases from the outer diameter side to the inner diameter side. The cap (10) for protecting a tubular body according to claim 3, wherein the cap is formed in a stepped shape.   The pipe body (p) has a receiving port (3) at one end in the axial direction with a straight tube portion (4) interposed therebetween and an opening (2) at the other end. 6), and the cap (10) is fitted and attached to a pipe end of the pipe body (p) on the receiving port (3) side. Cap (10) for protecting a tubular body according to any one of the above.   The pipe body (p) has a receiving port (3) at one end in the axial direction with a straight tube portion (4) interposed therebetween and an opening (2) at the other end. ) And the cap (10) is fitted and attached to a step (5) at the boundary between the inner surface (3) of the tube (p) and the inner surface of the straight pipe (4). The said adsorbent containing part (20) faces the space in the said receiving port (3) in the attachment state, The pipe-protecting body according to any one of claims 1 to 5, Cap (10).   A tubular body (p) protective structure using the tubular body protecting cap (10) according to claim 7, wherein the cap (10) includes an inner surface of a receiving port (3) of the tubular body (p). The straight pipe part (4) is fitted and attached to the step part (5) at the boundary with the inner surface, and the adsorbent-containing part (20 A cap (1) different from the cap (10) provided with a) is attached, and the end of the tubular body (p) on the receiving port (3) side is closed by the other cap (1). The tube (p) protective structure using the tube cap (10) for protecting the tube.

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