JP6255291B2 - Branch pipe joint and method of manufacturing the branch pipe joint - Google Patents

Description

  The present invention relates to a branch pipe joint suitable for bridge mounting provided with a heat insulating layer, and a method for manufacturing the branch pipe joint.

Most of the water pipes are buried in the ground, but when crossing rivers, there are parts that are bridged and exposed to the outside.
And, in a cold district, a heat retaining layer in which a heat retaining layer is provided in advance around the pipe main body part or the pipe joint main body part constituting the water pipe in the bridge extension part of the water pipe as described above, which is easily exposed to the cold wind. Layered pipes and fittings are used.
As such a branch pipe joint with a heat insulating layer, the inventor of the present invention uses a branch pipe joint 100 (Patent Document 1) as shown in FIG. 19 or a branch pipe joint 200 (Patent Document 2) as shown in FIG. ) Has already been proposed.

That is, as shown in FIG. 19, one branch pipe joint 100 includes a pipe joint main body 110, a heat retaining layer 120, and a racking layer 130.
The pipe joint main body part 110 includes a straight pipe part 111 and a branch pipe part 112.

  The heat insulating layer 120 is shown in FIGS. 20 and 21 as a heat insulating material 121 having a shape that is cut into two parts on the surface including the tube axis of the straight tube portion 111 and the tube shaft of the branch tube portion 112. Thus, the pipe joint main body 110 is provided so as to keep the temperature of the pipe joint main body 110 sandwiched therebetween. Yo

The racking layer 130 is provided so as to protect the periphery of the heat retaining layer 120, and is formed of a first racking cover 131 and a second racking cover 132.
22B, the first racking cover 131 is formed by cutting out a resin sheet into a first racking cover shape (including a stacking allowance), and includes a notch 131a.
As shown in FIG. 21, the first racking cover 131 is formed so that the notch 131 a forms a direct opening of the heat insulating layer 120 so that the branch pipe heat insulating portion of the heat insulating layer 120 forms an opening protruding to the outside of the first racking cover 131. It is wound around the pipe part heat insulation part and surrounds the straight pipe part heat insulation part.

The second racking cover 132 is formed by cutting out a resin sheet into the shape of the second racking cover as shown in FIG. 22 (a). As shown in FIG. Is wrapped around the branch pipe heat insulating part.
Although not shown, the first racking cover 131 and the second racking cover 132 are each fixed to a state in which a stainless steel band is wound and tightened from the surroundings to cover the heat retaining layer 120.

As described above, the branch pipe joint 100 includes the heat insulating layer 120 in advance, and the heat insulating layer 120 is formed by the first racking cover 131 and the second racking cover 132 so that the heat insulating layer 120 is protected. Therefore, when it is used for a bridge attachment part of a water pipe, it is possible to prevent the tap water in the pipe of the bridge attachment part from freezing in winter, etc. by simply connecting to the pipes before and after the pipe. . In addition, since the laying work on a bridge with a poor scaffold can be shortened and simplified, the work can be performed safely.
Further, when the branch pipe joint 100 is discarded, it can be easily disassembled into parts and easily separated for each material, so that it is highly recyclable.

On the other hand, as shown in FIG. 23, the branch pipe joint 200 includes an outer pipe main body 220 serving as a racking layer including an outer straight pipe portion 221 and an outer branch portion 222 branched from the outer straight pipe portion 221, and an outer pipe main body. 220, a pipe joint main body portion including an inner straight pipe portion 211 corresponding to the outer straight pipe portion 221 and an inner branch portion 216 branched from the inner straight pipe portion 211 and corresponding to the outer branch portion 222. An inner tube main body 210 and a heat insulating layer 230 provided between the outer tube main body 220 and the inner tube main body 210 are provided.
The heat insulating layer 230 is formed by filling and foaming urethane resin between the inner tube main body 210 and the outer tube main body 220.
In FIG. 23, 212 is a first engaging portion, 213 is a second engaging portion, 214 is a socket, 215 is a nipple, 240 is a flange, and 241 is a bolt hole.
As described above, the branch pipe joint 200 is formed by filling the thermal insulation layer 230 with urethane resin and foaming, so that the branch pipe joint 200 is reliably formed between the inner pipe main body 210 and the outer pipe main body 220 without a gap. .

JP 2013-19506 A Japanese Unexamined Patent Publication No. 2014-5675

  However, it has been found that the branch pipe joint 100 of FIG. 19 and the branch pipe joint 200 of FIG. 23 have the following problems.

(Problems of branch pipe joint 100)
The branch pipe joint 100 has a peripheral edge portion of the opening formed by the notch 131a at the edge 132a of the second racking cover 132 so that water does not enter from the boundary portion between the first racking cover 131 and the second racking cover 132. The first racking cover 131 and the second racking cover 132 are integrated with each other by welding to the boundary or welding along the boundary.
However, in the case of using the first racking cover 131 and the second racking cover 132 formed from a polyethylene sheet, the first racking cover 131 and the second racking cover 132 may be formed from thin sheets. Can not. That is, if a thin-walled one is used, it cannot be fused.
That is, it is difficult to further reduce the weight and size of the branch pipe joint.
On the other hand, when welding is performed, the edge of the second racking cover 132 on the first racking cover 131 side has a substantially bowl shape, so that the butted portion of the first racking cover 131 and the second racking cover 132 is bowl-shaped. Since it has a three-dimensional complicated shape, it must be welded while moving the welding rod to this complicated shape. Therefore, welding is difficult and automation is difficult. In addition, when manual welding is performed, there is a problem that the variation in quality increases.

(Problems of branch pipe joint 200)
(1) Since the first engagement portion 212 and the second engagement portion 213 are screw-joined, at least the screw portions of the first engagement portion 212 and the second engagement portion 213 are made of metal. Inevitably, the manufacturing cost increases, and the weight increases, which causes problems in terms of workability.
(2) Since the heat insulating layer 230 is formed by filling and foaming urethane resin, it is difficult to recycle when it is discarded.
(3) When attaching the air valve or the repair valve on the flange, in order to attach the fixing bolt, a space for inserting the bolt into the bolt hole 241 of the flange 240 is required on the lower side of the flange.
Therefore, the thickness of the portion on the branching portion side of the heat retaining layer 130 cannot be increased so much that the heat retaining performance on the branching portion side cannot be sufficiently obtained.
Incidentally, an air valve is generally a flange standard with a nominal diameter of 75 mm, its bolt PCD is 168 mm, and the bolt used is M16.
In consideration of tightening the bolt with a ratchet wrench at the time of construction, the outer diameter of the outer branch portion 222 must be kept to about 120 mm at most, and as a result, the heat insulation thickness of the outer branch portion 222 can only be about 15 mm. I understood it.

  In view of the above circumstances, the present invention provides a branch pipe joint with a heat insulating layer that can be reduced in weight, reduced in manufacturing cost, can be manufactured with high productivity, and is highly recyclable, and a manufacturing method thereof. The purpose is to do.

In order to achieve the above object, a branch pipe joint according to the present invention (hereinafter referred to as “branch pipe joint of the present invention”) has a straight pipe part and a branch pipe part branched from the straight pipe part. It comprises a body portion and a heat insulating material provided so as to surround a part of the straight pipe part and a part of the branch part including at least a boundary part between the straight pipe part and the branch part of the pipe joint main body part. A heat insulating layer, and a racking layer surrounding the heat insulating layer , wherein the racking layer is formed of at least a first racking cover and a second racking cover formed from a resin sheet material, and the first racking cover includes the with surrounding the straight tube portion retaining section of the heat insulating layer, and the branch portions insulation portion has a cylindrical shape having an opening facing the outside of the first racking cover, the second racking cover, branch pipes of the heat insulating layer Enclose the thermal insulation part A cylindrical cover main body portion and a skirt portion projecting outward from the edge of the cover main body on the first racking cover side, wherein the skirt portion is formed on the first racking cover. A branch pipe joint that is attached to the outer wall of the first racking cover around the opening and is fixed by a rivet or a tapping screw around the opening , wherein the pipe joint main body portion is the branch pipe At the end of the part, it has a flange for connection with another piping member, and the heat insulating layer is made of a heat insulating material that can be retrofitted separately from the adjacent heat insulating layer part, With the heat insulating material that can be attached later removed, between the adjacent heat insulating layer portion and the flange, the flange hole is connected to the bolt hole provided in the flange from the adjacent heat insulating layer side. A flange-side heat retaining portion formed so as to form a gap through which a bolt can be inserted, and the heat retaining material that can be retrofitted is inserted into the head of the bolt after the flange is connected, and a notch that can be retrofitted to the flange And a third racking cover that surrounds the flange side heat retaining portion .

  On the other hand, the branch pipe joint manufacturing method according to the present invention (hereinafter referred to as “the manufacturing method of the present invention”) includes a straight pipe portion and a pipe joint main body portion having a branch pipe portion branched from the straight pipe portion. A step of forming a heat insulating layer by surrounding a part of the straight pipe portion including at least a boundary portion between the straight pipe portion and the branch portion of the pipe joint main body portion and a part of the branch portion with a heat insulating material; A resin sheet material for forming a first racking cover (hereinafter, referred to as a “first racking cover forming sheet”) formed in a developed shape of one racking cover is disposed in a cylinder so as to surround the straight pipe portion heat retaining portion of the heat retaining layer. A second racking cover forming resin sheet material (hereinafter referred to as “a second racking cover forming resin sheet material”) having a cover body portion forming portion and a skirt portion forming portion formed in a developed shape of the second racking cover. Second racking cover formation And the skirt portion formed by the skirt forming portion of the first racking cover at the same time as forming the cover main body portion by surrounding the branch pipe portion heat insulating portion of the heat insulating layer with the cover main body forming portion. A step of providing the outer periphery of the opening so as to overlap the outer periphery of the opening, and a lower hole is formed in a portion where the skirt portion and the skirt portion of the first racking cover overlap, and a rivet or rivet is formed from the skirt portion side toward the first racking cover A tapping screw is fitted or screwed in, and a step of fixing the skirt portion and the first racking cover with a rivet or a tapping screw is provided.

In the branch pipe joint of the present invention, the material of the pipe joint main body is not particularly limited, but a synthetic resin is preferable because weight reduction can be achieved. Examples of the synthetic resin include polyethylene resin, cross-linked polyethylene resin, and polybutene resin. .
In addition, the pipe joint body is not particularly limited, but when other piping members such as an air valve and a repair valve are connected to the branch pipe, a flange connecting flange is provided at the end of the branch pipe. It is preferable that

There is no particular limitation on providing the flange for connecting the flange to the main pipe portion, for example, a method of fusing a pipe joint having a flange at one end to a branch pipe portion made of synthetic resin cheese, and a fusing method For example, butt welding is used.
The main pipe section is not particularly limited. For example, a short resin pipe is butt-fused to a straight pipe section or a branch pipe section of synthetic resin cheese, or received at the end of the straight pipe section or the branch pipe section. A synthetic resin short pipe is fitted and bonded to the receiving port of an existing synthetic resin pipe joint provided with a port, or it is provided at the end of a straight pipe part or branch pipe part of an existing electrofusion type branch pipe joint. The length of the straight pipe portion or the branch pipe portion can be set to a desired length by fitting a short resin pipe to the receiving port and performing electrical fusion.

In the branch pipe joint of the present invention, the heat insulating material constituting the heat insulating layer is not particularly limited, but a synthetic resin foam such as a polyethylene resin foam, a polystyrene resin foam, and a polyurethane resin foam is preferable.
In consideration of productivity, the heat insulating material is preferably formed in a shape divided into two or more along the circumferential direction of the heat insulating layer.
Further, the thickness of the heat insulating layer is appropriately determined according to the environment or application of the place where the branch pipe joint is used.

In the branch pipe joint of the present invention, the material of the resin sheet forming the racking layer is not particularly limited, and examples thereof include a crosslinked polyethylene resin and a polyethylene resin. Since a weight reduction can be achieved, a crosslinked polyethylene resin is preferable.
In order to improve weather resistance, it is preferable to use a crosslinked polyethylene resin containing carbon black as a black pigment and colored black.

Moreover, each said racking cover is obtained using the racking cover formation sheet formed by cutting out or punching out the resin sheet to the expansion | deployment shape (including overlap allowance) of each racking cover.
The racking cover forming sheet may be wound around the heat insulating layer while being curved so as to surround the heat insulating layer, and the racking cover forming sheet may be formed so as to easily deform the racking cover forming sheet. It may be deformed in advance to the shape of the racking cover or a state close thereto while heating.

The rivet used for the branch pipe joint of the present invention is such that, for example, the leading end of the rivet is expanded by inserting one pilot hole so as to penetrate the other pilot hole and pushing the head. What is called a rivet is mentioned.
Moreover, it is preferable that the rivet has the same color as the racking material forming the racking layer.
The material of the rivet is not particularly limited as long as it has physical properties such as weather resistance, corrosion resistance, and durability that do not cause a problem when the branch pipe joint is used, and examples thereof include aluminum and stainless steel, and aluminum is preferable.

Further, in the branch pipe joint of the present invention, the cover main body portion of the second racking cover has a portion that becomes both ends in the circumferential direction of the heat insulating layer of the second racking cover forming sheet formed from the resin sheet in a state of surrounding the heat insulating layer. The heat insulation layer is surrounded in an overlapping state or in a state where both ends face each other.
In addition, when providing an overlap part, it is preferable to previously form the overlap margin for the circumferential length of the heat retaining layer of the second racking cover forming sheet.

The second racking cover is not particularly limited, but the overlapping portion is fixed with a rivet or a tapping screw in the same manner as the skirt portion, or is tightened in the direction of diameter reduction from the periphery by a belt so as not to deform the heat retaining layer. Can be held.
The above belts are called tie belts, binding belts, etc., and the material thereof has physical properties such as weather resistance, corrosion resistance, durability, etc. that do not pose any problems when using branch pipe joints. Although not particularly limited, stainless steel ones conventionally used for socket covers and the like are preferable.

In addition, the first racking cover is in a state in which the heat insulating layer is surrounded, and the first racking cover forming sheet formed from the resin sheet is overlapped with each other at both ends in the circumferential direction of the heat insulating layer, or in a state where both ends are in contact with each other. It is designed to surround the heat insulation layer.
And although a 2nd racking cover is not specifically limited, It can clamp | tighten from a circumference | surroundings to a diameter reduction direction with a belt to such an extent that a heat retention layer is not deformed, and can hold | maintain an enclosed state.

Although the branch pipe joint of the present invention is not particularly limited, for example, it is preferable that the skirt portion is composed of a plurality of skirt pieces separated by a plurality of cuts along the circumferential direction of the opening of the first racking cover. .
That is, by providing a cut in a direction parallel to the central axis of the curve in advance in the circumferential direction of the curve of the resin sheet material of the skirt portion forming portion of the resin sheet material as described above, When the skirt portion is formed, it is easy to bend the skirt pieces so as to follow the peripheral edge of the opening of the first racking cover, and it is easy to attach to the wall surface of the first racking cover.

The branch pipe joint of the present invention is not particularly limited. For example, the skirt portion has a wall surface shape around the opening of the first racking cover with the skirt portion forming portion of the second racking cover forming sheet forming the second racking cover. It can be set as the structure formed by deform | transforming into the saddle shape to accompany.
That is, the skirt portion is formed around the opening of the first racking cover simply by winding the cover body portion forming portion of the second racking cover forming sheet into a curved shape so as to surround the heat insulating layer portion of the branch pipe portion. It can be accompanied. That is, the second racking cover can be easily attached.

  The method for deforming the saddle shape in advance as described above is not particularly limited, but, for example, along the boundary between the cover body portion forming portion and the skirt portion forming portion of the second racking cover forming sheet forming the second racking cover. In such a state that the folding line is drawn as described above, the second racking cover forming sheet is wound around the cylindrical body to form a cylindrical body in which the cover main body part forming part and the skirt part forming part are cylindrical, and the cylindrical body In a state in which a holding jig having a shape along the fold line is arranged on the cover body portion forming portion side along the fold line, at least bend with the holding jig sandwiched between the holding jig and the cover body portion forming portion. After heating so that the portion along the line can be bent, the skirt portion is bent in the holding jig direction along the folding line while cooling the skirt portion forming portion. How is deformed and the saddle shape accompany the formed portion on a wall surface shape around the opening of the first racking cover and the like.

  The fold line may be drawn after the second racking cover forming sheet is formed, or may be printed at the same time as the second racking cover forming sheet is punched from the resin sheet.

The holding jig may be disposed at least in the bending deformation direction of the skirt portion forming portion.
Although it does not specifically limit as said suppression jig, For example, a plate-shaped thing or the tubular shape formed in the shape where a pipe end part follows the branch crossing part of the straight pipe part heat insulation part and branch pipe part heat insulation part of a heat insulation layer A holding jig is mentioned.

When the tubular holding jig is used, the tubular holding jig is formed so that the cover body portion forming portion and the skirt portion forming portion have a cylindrical shape so that the fold line is along the tube end along the branching intersection of the tubular holding jig. The tubular holding jig and the cover main body forming portion may be sandwiched between the sandwiching jigs in the state of being inserted into the inside.
One short plate-shaped holding jig may be used, and each time a part of the skirt portion forming portion is deformed, the holding jig may be gradually deformed by shifting from one end to the other in the longitudinal direction.

Although it does not specifically limit as a clamping jig, For example, a giant clam is mentioned.
Examples of the heating method include a method of heating with a gas burner. Incidentally, when the second racking cover forming sheet made of polyethylene resin is heated with a gas burner, for example, it may be heated for about 1 second with a width of 5 cm along the boundary line between the cover main body portion forming portion and the skirt portion forming portion.
As a method of bending while cooling, when performing manually, for example, there is a method of bending in the jig direction while holding the skirt forming portion heated with a wet cloth.

  In the branch pipe joint of the present invention, the branch pipe portion of the pipe joint main body portion has a flange for connection with another piping member at the end, and the heat insulating layer is in contact with the adjacent heat insulating layer portion. A bolt hole provided in the flange from the adjacent heat insulating layer side between the adjacent heat insulating layer portion and the flange, with the heat insulating material which can be attached separately and removed from the heat insulating material. A flange-side heat retaining portion formed so as to form a gap through which a bolt for flange connection can be inserted, and the heat retaining material that can be retrofitted is inserted into the head of the bolt after the flange connection, and can be retrofitted. And a third racking cover that surrounds the periphery of the heat insulating layer portion formed of the heat insulating material that can be retrofitted, as well as the outer periphery on the flange side. Masui.

  The term “possible for retrofitting” means that it can be attached after the flange connection, and when a nut is arranged on the branch pipe joint side or a screw hole is provided in the flange of the branch pipe joint, When a flange is connected by screwing into a screw hole of a nut or a flange, the case where it is attached in advance before the flange connection is included.

In the branch pipe joint of the present invention, a plurality of the heat retaining materials that can be retrofitted may be provided so as to be stacked in the pipe axis direction of the branch pipe portion.
For example, a small-diameter heat insulating material that can be retrofitted in a shape in which a small-diameter ring having the same thickness as the inner diameter of the notch and having the same thickness in the height direction of the notch is divided in the circumferential direction is larger than the small-diameter ring. It consists of a large-diameter heat insulating material that can be retrofitted into a shape in which a large-diameter ring is divided in the circumferential direction
A notch is formed by arranging a small-diameter ring thermal insulation layer portion made of a small-diameter thermal insulation material and a large-diameter ring thermal insulation layer portion made of a large-diameter thermal insulation material in a stacked state in the tube axis direction of the branch pipe portion. It is good also as such a structure.

The racking layer may be formed by providing not only the first to third racking covers but also one or more other racking covers between the second racking cover and the third racking cover, for example. .
Further, each racking cover can be overlapped with an adjacent racking cover at its end, and the overlapped portion can be tightened from the periphery with a band, or can be fixed with a rivet or tapping screw.

That is, after flange connection of other piping materials with bolts, the flange-side heat retaining portion can be formed, so that other piping materials can be flange-connected even if the flange-side heat retaining portion is sufficiently thick. .
And by setting it as such a structure, the whole heat insulation layer part of the branch pipe part which reaches a flange can be made into the thing with sufficient heat insulation of sufficient thickness.
In addition, the heat insulating layer portion does not interfere with the flange connection, and other piping members can be easily flanged with bolts.
In addition, although it does not specifically limit with said other piping material, For example, an air valve, a repair valve, a short pipe with a flange, a pipe joint with a flange, etc. are mentioned.

In addition, since the heat insulating material that can be retrofitted has a notch, if the head of the bolt faces inside the notch, the head of the bolt does not get in the way and the heat insulating material that can be retrofitted can be easily retrofitted. Can do.
Further, in the above configuration, the flange side end portion of the third racking cover surrounds the flange for connection with other piping members and is sandwiched between the flanges by a band provided so as to be tightened from the periphery. Then, since the fastening force by the band is received by the flange, the fastening force can be increased and the third racking cover can be firmly attached. And it can prevent that the heat insulating material which comprises a heat retention layer deform | transforms by clamping | tightening, and in connection with it, a wrinkle arises in the wall surface at the side of the flange of a 3rd racking cover, and appearance worsens.

In the branch pipe joint of the present invention, a reinforcing pipe made of a material having rigidity higher than that of the heat insulating material constituting the heat insulating layer is externally fitted on both sides in the tube axis direction of the straight pipe heat insulating portion of the heat insulating layer. It is preferable that both ends in the tube axis direction of the tube surround the periphery of the reinforcing pipe and be sandwiched between the reinforcing pipe by a band provided so as to be tightened from the periphery.
That is, the tightening force by the band is not directly applied to the heat insulating layer, and the heat insulating material constituting the heat insulating layer is deformed by tightening, and accordingly the wrinkle is generated on the wall surface of the first racking cover at the tightening portion and the appearance is deteriorated. Can be prevented.

The branch pipe joint of the present invention is not formed with a heat insulating layer of a length that can be fitted to the receptacles of the electric fusion joint at both ends of the straight pipe portion of the pipe joint main body portion and can be attached to the clamp of the electric fusion joint. It is good also as a structure which has a part.
That is, since the heat insulation layer non-formation part is provided, when connecting with another pipe or a pipe joint by an electric fusion joint, the electric fusion can be easily performed without performing an operation of removing the heat insulation material.

  As described above, the branch pipe joint of the present invention includes a straight pipe part, a pipe joint body part having a branch pipe part branched from the straight pipe part, and at least a straight pipe part and a branch part of the pipe joint body part. A branch pipe comprising a heat insulating layer made of a heat insulating material provided so as to surround a part of the straight pipe part and a part of the branch part including the boundary part, and a racking layer surrounding the heat insulating layer A joint, wherein the racking layer is formed of at least a first racking cover and a second racking cover formed from a resin sheet material, and the first racking cover surrounds the straight pipe portion heat insulating portion of the heat insulating layer. The cover main body portion having a cylindrical shape in which the branch portion heat insulating portion has an opening facing the outside of the first racking cover, and the second racking cover surrounds the branch pipe portion heat insulating portion of the heat insulating layer. And this hippo A skirt portion projecting around to extend from an edge of the main body portion on the first racking cover side, and the skirt portion is formed on the outer wall of the first racking cover around the opening of the first racking cover; In addition to being attached, it is fixed around the opening by rivets or tapping screws, so that welding is not required and the racking cover can be formed of a thin resin sheet. Then, it is only necessary to overlap the skirt portion with the opening peripheral edge of the first racking cover and fix the overlapping portion with a rivet or a tapping screw, so that it can be manufactured with high productivity.

Since the skirt portion is provided, rainwater does not enter the heat insulation layer via the joint portion of the first racking cover and the second racking cover even if they are not fused, and the heat insulation layer gets wet, Rainwater does not enter the main body and the heat retention effect is not hindered.
Moreover, when discarding, it is easy to recycle because it is separated into a racking cover, a heat insulating material constituting the heat insulating layer, and a pipe joint main body part, and is easily separated for the same kind of resin material.

1 is a half cross-sectional view showing a first embodiment of a branch pipe joint of the present invention, with an air valve attached thereto. It is a perspective view of the state which removed the flange side heat retention part of the branch pipe coupling of FIG. FIG. 2 is a half cross-sectional view of a state where a flange side heat retaining portion of the branch pipe joint of FIG. 1 is removed. It is a half sectional view showing the principal part of flange connection with an air valve. It is sectional drawing of the pipe joint main-body part of the branch pipe joint of FIG. FIG. 3 is a development view of a first racking cover and a second racking cover of the branch pipe joint of FIG. 1. It is a figure explaining the 1st heat insulating material of the branch pipe coupling of FIG. It is a figure explaining the 2nd-4th heat insulating material of the branch pipe joint of FIG. It is a figure explaining the 5th heat insulating material of the branch pipe coupling of FIG. It is sectional drawing which represents the fixed state of a rivet typically. It is sectional drawing showing the construction state which connected another pipe to the straight pipe part of the branch pipe coupling of FIG. It is a figure explaining the process of connection construction with the other pipe of FIG. It is a figure explaining the post process of FIG. FIG. 6 is a half cross-sectional view showing a second embodiment of the branch pipe joint of the present invention, with the flange side heat retaining portion removed. It is an expanded view of the 1st racking cover and 2nd racking cover of the branch pipe coupling of FIG. FIG. 6 is a half cross-sectional view showing a third embodiment of the branch pipe joint of the present invention, in a state where the flange side heat retaining portion is removed. It is an expanded view of the 1st racking cover and 2nd racking cover of the branch pipe joint of FIG. It is a perspective view of the 1st racking cover used for 4th Embodiment of the branch pipe coupling of this invention. It is sectional drawing of the branch pipe joint which the inventor of this invention proposed previously. FIG. 20 is a perspective view schematically illustrating a manufacturing process of the branch pipe joint of FIG. 19. It is a perspective view explaining the branch pipe coupling of FIG. FIG. 20 is a development view of the first racking cover and the second racking cover of the branch pipe joint of FIG. 19. It is sectional drawing of the other branch pipe joint which the inventor of this invention proposed previously. It is a perspective view of the 2nd racking cover formation sheet of 4th Embodiment of the branch pipe coupling of this invention. It is a perspective view of the state which set the 2nd racking cover formation sheet of FIG. 24 to the tubular holding jig. It is a perspective view explaining a heating process. It is a perspective view explaining a bending deformation process. It is a perspective view of the state which set the plate-shaped control jig to the 2nd racking cover formation sheet.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIGS. 1-8 represents 1st Embodiment of the branch pipe coupling of this invention. In addition, the dimension of each part shown below was described in order to make this invention easy to understand, and the branch pipe joint of this invention is not limited to these dimensions.

As shown in FIGS. 1 to 3, the branch pipe joint A includes a pipe joint main body 1 a, a heat insulating layer 2 a, and a racking layer 3 a.
As shown in FIGS. 1 to 3 and 5, the pipe joint main body 1 a includes a straight pipe part 11, a branch pipe part 12, and a flange 13.

The straight pipe part 11 is made of polyethylene resin at the both ends of the cheese 14 made of polyethylene resin and the straight pipe part of the cheese 14, and the short pipe serving as the heat insulation layer non-forming part 11 a of the straight pipe part 11 is butt melted. It is formed by wearing. Note that the bead portion has been removed by cutting.
The length of the heat insulation layer non-forming portion 11a is such that when the electric fusion joint 9a is fused, when the other pipe (or pipe joint) 9b is connected as described later using the electric fusion joint 9a shown in FIG. It is sufficient if the clamp is provided with a length that allows the clamp to be mounted. In the case of this branch pipe joint A, the length is 150 mm.
The branch pipe part 12 is formed by butt-welding a flanged short pipe 15 to a branch pipe part of cheese 14 made of polyethylene resin, and a bead part generated by the fusion is cut and removed.

The heat insulating layer 2a includes a pair of semi-ring-shaped first heat insulating materials 21 having a substantially L-shaped cross section shown in FIG. 7, a pair of second heat insulating materials 22 having a pair of semi-ring shapes shown in FIG. 3 heat insulating materials 23, a pair of fourth heat insulating materials 24, and a pair of retrofitted fifth heat insulating materials 25 forming the flange side heat insulating portion shown in FIG.
The first to fifth heat insulating materials 21 to 25 are formed of a foamed polystyrene resin (EPS).

Moreover, the 1st-5th heat insulating materials 21-25 are each inserted | pinched between the 1st-5th heat insulating materials 21-25 used as a pair so that the predetermined part of the pipe joint main-body part 1a may be set as a heat retention state. In addition to being mounted in the city, it is stopped so as to keep the mounted state with adhesive tape.
The reinforcing pipe 5 is externally fitted to both sides in the tube axis direction of the straight pipe portion heat retaining portion of the heat retaining layer 2a, that is, the heat retaining layer portion formed by the third heat retaining material 23 and the fourth heat retaining material 24.
The reinforcing pipe 5 is a short pipe made of polyethylene resin and has only to have a pipe thickness of 3 mm or more. In the case of this branch pipe joint A, it is 7.5 mm and has a length of 80 mm.

A semi-doughnut-shaped sheet formed by cutting a black polyethylene sheet into a donut shape on the surface of the fifth heat insulating material 25 on the side of the first heat insulating material 21 and the second heat insulating material 22 or punching and then dividing it into half-shaped dough. Bonded through a sealant.
Further, as shown in FIG. 4, the fifth heat insulating material 25 is retrofitted after the air valve 8 having the flange 81 is flange-connected using the bolt 71 and the nut 72.
That is, as shown in FIG. 9, the fifth heat insulating material 25 is inserted into the first heat insulating material 21 and the second heat insulating material 22 through the semi-doughnut-shaped sheet while the head of the bolt 71 enters the notch 25 a. It will be retrofitted to the condition received.
The air valve 8 may be attached at a construction site, or may be attached in advance at the time of factory shipment.

A racking layer 3a is provided around the heat insulating layer 2a.
The racking layer 3 a is formed by the first racking cover 31, the second racking cover 32, and the third racking cover 33.

The first racking cover 31 is formed, for example, by cutting out or punching a black cross-linked polyethylene sheet containing a 1.5 mm carbon pigment so as to have the developed shape shown in FIG. 6A. Consists of S1.
The first racking cover forming sheet S1 includes notches 31a on both sides in the longitudinal direction, and an overlap margin 31b on one side in the longitudinal direction.
The width of the overlap allowance 31b is, for example, about 20 mm.

  The first racking cover 31 is formed by two cutout portions 31a while the overlapping portion 31b of the first racking cover forming sheet S1 overlaps the other end portion in the longitudinal direction of the first racking cover forming sheet S1. From the opening, the branch pipe portion 12 side of the pipe joint main body portion 1a is exposed to the outside of the first racking cover 31, and is formed in a wound state so that both ends in the short direction overlap a part of the reinforcing pipe 5. Yes.

In the case of this branch pipe joint A, the width of the overlapping portion of the first racking cover 31 and the reinforcing pipe 5 is 30 mm. Accordingly, the reinforcing pipe 5 is exposed to the outside of the first racking cover 31 by a length of 50 mm.
And the 1st racking cover 31 is clamped with the stainless steel belt 6 from the outside of the overlapping part with the reinforcing pipe 5, and is held in a state where the heat insulating layer 2a is protected.
Further, the first racking cover 31 attached in this way comes to have the edge of the notch 31a follow the straight tube portion heat insulating portion of the heat insulating layer 2a and the branch intersection portion of the branch tube portion heat insulating portion.

The second racking cover 32 is formed, for example, by cutting or punching a black cross-linked polyethylene sheet containing a 1.5 mm carbon pigment so as to have the developed shape shown in FIG. 6B. Consists of S2.
The second racking cover forming sheet S2 includes a plurality of skirt pieces constituting a skirt portion separated by a cover main body portion 32d and a cut 32b provided along an edge of the cover main body portion 32d on the first racking cover 31 side. 32a and a stacking allowance 32c.

And the 2nd racking cover 32 has the branch pipe part heat insulation part of the heat insulation layer 2a so that the overlap margin 32c part of 2nd racking cover formation sheet S2 may overlap with the other end part of the longitudinal direction of 2nd racking cover formation sheet S2. The cover main body 32d is wound.
The edge of the cover main body 32d on the first racking cover 31 side is received by the first racking cover 31 at the periphery of the opening formed by the notch 31a.

Each skirt piece 32 a overlaps the first racking cover 31 so as to be in close contact with the outer wall surface of the first racking cover 31 at the peripheral edge of the opening.
Further, as shown in FIG. 10, the skirt piece 32 a is formed by fitting the rivet 4 into the lower hole provided in the skirt piece 32 a and the first racking cover 31, thereby forming the first racking by the black aluminum rivet 4. It is fixed to the cover 31.

The cover body portion 32d is joined by using the rivet 4 at the overlapping portion, or the belt 6 as described above is tightened from the surroundings so as not to impair the performance of the heat insulating layer 2a to protect the heat insulating layer 2a. It is held in the state.
Further, the skirt piece 32a is bent along the edge of the cover main body portion 32d of the cut 32b before the second racking cover forming sheet S2 is wound, and the skirt piece 32a is heated a little from the edge and bent. You may make it attach a bag. By doing so, the skirt piece 32a spreads in a trumpet shape at the time of winding so that the rivet can be fixed quickly.

Although the third racking cover 33 is not shown in the drawing, the third racking cover forming sheet provided with an overlap margin at one end in the longitudinal direction overlaps the overlap margin and the other end portion in the longitudinal direction, and has one end portion in the short direction. It is formed by being wound so as to surround the heat insulating layer portion formed by the fifth heat insulating material 25 of the heat insulating layer 2 a so as to be received by the peripheral surface of the flange 13, and the end on the flange side is flanged by the belt 6. It is pinched between.
Further, the end of the third racking cover 33 on the second racking cover 32 side protects the heat insulating layer 2a by tightening the belt 6 from the periphery with a strength that does not hinder the performance of the heat insulating layer 2a. Is held in.

Moreover, as shown in FIGS. 11-13, this branch pipe joint A can connect the other pipe | tube 9b as follows using the heat retention layer non-formation part 11a.
That is, as shown in FIG. 12, the heat retaining layer non-formed portion 11a is fitted in one of the sockets of the socket-type electric fusion joint 9a, and the end of the tube main body 92 of the other tube 9b is attached. After fitting into the other receiving port and using a clamp (not shown) so as not to move, the terminal pin 91 is energized and fused.

  Next, as shown in FIG. 13, after the terminal pin 91 of the electrofusion joint 9a is cut out to form only the joint body 9c, as shown in FIG. 11, the heat retaining layer of the connecting portion including the joint body 9c. The portion not provided with the cover is covered with the socket cover 3x, and the band 6 is wound and the both ends of the socket cover 3x are clamped and fixed between the band 6 and the reinforcing pipe 93 on the side of the reinforcing pipe 5 or the tube 9b.

As described above, in this branch pipe joint A, a plurality of skirt pieces 32 a are provided on the second racking cover 32 side, the skirt pieces 32 a are overlapped with the first racking cover 31, and the overlapping portions are fixed by the rivets 4. Therefore, even if the first racking cover 31 and the second racking cover 32 are formed using a thin cross-linked polyethylene resin, the first racking cover 31 and the second racking cover 32 can be easily fixed. In addition, rainwater or the like can be prevented from entering from the joint portion between the first racking cover 31 and the second racking cover 32.
Moreover, if the 5th water stop material 25 of the back attachment is provided and the 5th water stop material 25 is removed, the bolt 71 will be penetrated by the bolt hole 13a from the downward direction of the flange 13, and the air valve which is another piping member 8 can be easily flange-connected.

Since the 5th water stop material 25 is provided with the notch 25a, after connecting the air valve 8 by the flange with the volt | bolt 71, the 5th water stop material 25 is retrofitted and the flange side heat retention part of the heat retention layer 2a is formed easily. be able to.
That is, the thickness of the fifth water blocking material 25 can be increased to increase the thickness of the heat retaining layer 2a to a required thickness, thereby enhancing the heat retaining property.
Furthermore, since the flange side end of the third racking cover 25 surrounds the periphery of the flange 13 and is sandwiched between the flange 13 and the band 6, the tightening force by the band 6 is exerted by the flange 13. I can receive it.
Therefore, the third racking cover can be firmly attached by increasing the tightening force of the bunt 6. In addition, it is possible to prevent the fifth heat insulating material 25 constituting the heat insulating layer 2a from being deformed by tightening, and accompanying this, the third racking cover 25 is wrinkled at the tightening portion and the appearance is deteriorated.

Since the third heat insulating material 23 and the fourth heat insulating material 24 constituting the heat insulating layer 2a are externally fitted with reinforcement pipes made of polyethylene resin on both sides in the tube axis direction of the straight tube heat insulating portion of the heat insulating layer 2a. The both ends of the first racking cover 31 in the tube axis direction surround the periphery of the reinforcing pipe 5, and the overlapping portion of the first racking cover 31 and the reinforcing pipe 5 is sandwiched between the reinforcing pipes 5 by the band 6. The first racking cover 31 can be attached to the state.
That is, even if the band 6 is tightened with a strong tightening force, it is possible to prevent the first racking cover 31 from being wrinkled and deteriorating in appearance.

In addition, the 5th heat insulating material 25 is good also as a structure which consists of two parts, the small diameter half ring heat insulating material 25b and the large diameter half ring heat insulating material 25c which are shown with a dashed-dotted line in FIG. 1 and FIG. 9 (a).
That is, the small-diameter half ring heat insulating material 25b has the same outer diameter as the inner diameter of the notch 25a and the same thickness as the height of the notch 25a.
The large-diameter half ring heat insulating material 25 c is formed in the same shape as the portion below the notch 25 a of the fifth heat insulating material 25.
With such a configuration, after the flange connection is completed by the bolt 71 and the nut 72, first, the small diameter Hanling heat insulating material 25b is brought into contact with the flange 13 and retrofitted so as to fit inside the bolt 71, and then the large diameter half ring heat insulating material 25c. Can be retrofitted.

FIG. 14 is a second embodiment of the branch pipe joint of the present invention, and shows a state where the fifth heat insulating material 25 is removed in a half section.
As shown in FIG. 14, this branch pipe joint B is composed of an electric fusion joint after the straight pipe portion 11 of the pipe joint main body portion 1 b fuses a short pipe to the straight pipe portion of the cheese-type electric fusion joint. It is formed by cutting out the terminal pin portion.

Further, the reinforcing pipe 5 is externally fitted to a portion formed by only the third water-stopping material 23 of the heat retaining layer 2a without using the fourth water-stopping material 24.
And the 1st racking cover 34 is formed from the 1st racking cover formation sheet S3 of the shape shown in Drawing 15 (a), and the 2nd racking cover 35 is the 2nd racking cover of the shape shown in Drawing 15 (b). It is formed from the forming sheet S4.
In FIG. 15, 34a is a notch portion, 34b is an overlap allowance, 35a is a cover body portion, 35b is a skirt piece, 35c is a cut, and 35d is an overlap allowance.

FIG. 16 shows a third embodiment of the branch pipe joint of the present invention, and shows a state where the fifth heat insulating material 25 is removed in a half section.
As shown in FIG. 16, this branch pipe joint C has a pipe joint main body portion 1c obtained in the same manner as the pipe joint main body portion 1b, and does not use the fourth water-stopping material 24. The reinforcing pipe 5 is fitted on a portion formed only by the water stop material 23.

The first racking cover 36 is formed from the first racking cover forming sheet S5 having the shape shown in FIG. 17A, and the second racking cover 37 is the second racking cover having the shape shown in FIG. It is formed from the forming sheet S6.
In FIG. 17, 36a is a notch, 36b is an overlap allowance, 37a is a cover body, 37b is a skirt piece, 37c is a cut, and 37d is an overlap allowance.

FIG. 18 is a fourth embodiment of the branch pipe joint of the present invention, and shows the second racking cover.
The second racking cover 38 includes a cover main body portion 38a and a skirt portion 38b.

Although the skirt portion 38b is not shown, when the cover body portion 38a is wound so as to surround the branch pipe portion heat insulating portion of the heat insulating layer 2a, like the branch pipe joint of FIG. The racking cover 31 is brought into close contact with the opening periphery of the racking cover 31 accurately and easily.
The skirt portion 38 b is fixed to the rivet 4 in a state of being superimposed on the first racking cover 31.

And before the cover main-body part 38a is wound so that the circumference | surroundings of a heat retention layer may be enclosed, the skirt part 38b is previously formed in the collar shape as follows.
(1) As shown in FIG. 24, a folding line 39c is written along the boundary line between the cover main body forming portion 39a and the skirt forming portion 39b of the second racking cover forming sheet S7.
(2) The second racking cover forming sheet S7 is bent into a cylindrical shape, and the inner end edge 510 of the tubular holding jig 500 is formed such that the folding line 39c is formed in the folding line shape of the tubular holding jig 500 as shown in FIG. Is inserted into the tubular holding jig 500 so as to coincide with the above.
(3) The tubular holding jig 500 and the vicinity of the fold line 39c on the cover main body side of the second racking cover forming sheet S7 are fixed with a chamfer 600 as a sandwiching jig.
(4) As shown in FIG. 26, the burner 700 heats the skirt portion forming portion 39b side of the second racking cover forming sheet S7 along the folding line 39c.
(5) After heating to a temperature that can be deformed by hand, as shown in FIG. 27, the portion to be deformed is bent outwardly while being cooled by a wet cloth 800 along the fold line 39c to form the skirt portion 38b. .

  Incidentally, the second racking cover forming sheet S7 is produced by cutting out the second racking cover forming sheet S7 from the 1.1 mm thick cross-linked polyethylene resin sheet pattern, and the second racking cover shown in FIG. 18 as described above. As a result, it was possible to obtain a branch pipe joint of a Japanese invention with a thin wall.

FIG. 28 shows another example of the method for forming the skirt portion 38b.
That is, in this method, the vicinity of the portion where the end edge 502 of the jig 501 is held along the bending line 39c and is sandwiched by the giant claws 600 is partially heated, and the bending using the waste cloth 800 is performed each time the heating is completed. The deforming operation is performed, and the operation of performing partial deformation is suppressed and repeated while shifting the position of the jig 501 to finally form the skirt portion 38b.
Although not shown, the plate-shaped holding jig 501 is formed of a core material formed of a polyethylene resin plate having a thickness of 3 mm and a copper tape surrounding the periphery of the core material. It has a shape along the fold line 39c.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the branch pipe portion includes the flange, but the flange may not be provided.
In the above-described embodiment, the heat insulating material has been divided into two pairs divided by the dividing plane parallel to the tube axis of the straight pipe part and / or the branch pipe part, but the straight pipe part or the branch pipe part If it is possible to surround the periphery, it may be a mating surface inclined to the tube axis.

A, B, C Branch pipe joints 1a, 1b, 1c Pipe body part 2a Heat insulation layer 11 Straight pipe part 11a Heat insulation layer non-formation part 12 Branch pipe part 13 Flange 13a Bolt hole 14 Cheese 21 First heat insulation material 22 Second heat insulation Material 23 3rd heat insulating material 24 4th heat insulating material 25 5th heat insulating material 25a Notch part 3a Racking layer 3x Socket cover 31 1st racking cover 31a Notch part 31b Overlap allowance 32 2nd racking cover 32a Skirt piece (skirt part)
32b cut line 32c overlap allowance 32d cover main body 33 third racking cover 34 first racking cover 34a cutout 34b overlap allowance 35 second racking cover 35a cover main body 35b skirt piece 35c cut 35d overlap allowance 36 first racking cover 36a cutout 36b Overlap allowance 37 Second racking cover 37a Cover body portion 37b Skirt piece 37c Cut 37d Overlap allowance 38 Second racking cover 38a Cover body portion 38b Skirt portion 39a Cover body portion forming portion 39b Skirt portion forming portion 39c Bending line 4 Rivet 5 Reinforcement Pipe 6 Belt 8 Air valve (other piping members)
81 Flange 9a Electric fusion joint 9b Other pipe (or pipe joint)
9c Joint body 91 Terminal pin 91
93 Reinforcement pipe 71 Bolt 72 Nut 500 Tubular restraining jig 501 Restraining jig 502 End edge 510 Inner edge 600 Shrew 10000 (clamping jig)
700 Burner 800 Wet waste S1, S3, S5 First racking cover forming sheet S2, S4, S6, S7 Second racking cover forming sheet

Claims (7)

One of the straight pipe parts including a straight pipe part, a pipe joint body part having a branch pipe part branched from the straight pipe part, and at least a boundary part between the straight pipe part and the branch part of the pipe joint main body part A heat insulating layer made of a heat insulating material provided so as to surround a part of the part and the branch part, and a racking layer surrounding the heat insulating layer ,
The racking layer is formed of at least a first racking cover and a second racking cover formed from a resin sheet material, and the first racking cover surrounds the straight pipe portion heat retaining portion of the heat retaining layer and includes a branch portion heat retaining portion. There have been a cylindrical shape having an opening facing the outside of the first racking cover,
The second racking cover projects to the periphery so as to extend from a cylindrical cover main body part surrounding the branch pipe part heat insulating part of the heat insulating layer and from the edge of the cover main body side of the first racking cover. A skirt portion, and the skirt portion is attached to an outer wall of the first racking cover around the opening of the first racking cover, and is fixed by a rivet or a tapping screw around the opening. Branch pipe joints,
The pipe joint main body has a flange for connection with another piping member at the end of the branch pipe.
In the heat insulating layer, a portion in contact with the flange is made of a heat insulating material that can be attached separately from an adjacent heat insulating layer portion, and the heat insulating material that can be attached later is removed, and the adjacent heat insulating layer portion and the flange are removed. A flange side heat insulating portion formed so that a gap through which a bolt for flange connection can be inserted is formed in a bolt hole provided in the flange from the adjacent heat insulating layer side,
The heat retaining material that can be retrofitted is provided with a notch that enables the retrofitting of the bolt head after the flange connection, along the outer periphery on the flange side,
A branch pipe joint comprising a third racking cover surrounding the flange side heat retaining portion . The flange side end of the third racking cover surrounds the flange for connection with other piping material and is sandwiched between the flange by a band provided so as to be tightened from the periphery. Branch pipe fittings. The reinforcement pipe which consists of material higher in rigidity than the heat insulating material which constitutes the heat insulating layer is externally fitted on both sides in the tube axis direction of the straight pipe heat insulating portion of the heat insulating layer according to claim 1. The both ends of the said 1st racking cover of the said pipe axial direction surround the circumference | surroundings of the said reinforcement pipe, and are clamped between the said reinforcement pipes by the band provided so that it may clamp | tighten from the circumference | surroundings. 2. The branch pipe joint according to 2. At both ends of the straight pipe portion of the pipe joint main body portion according to claim 1, a heat insulation layer non-forming portion having a length that can be fitted to the receptacle of the electric fusion joint and to which the clamp of the electric fusion joint can be attached. branch pipe joint according to any one of which claims 1 to 3 which has. It is a manufacturing method of the branch pipe joint in any one of Claims 1-4, Comprising: At least said pipe joint of the pipe joint main-body part which has a straight pipe part and the branch pipe part branched from this straight pipe part Forming a heat insulating layer by surrounding a part of the straight pipe part and a part of the branch part including a boundary part between the straight pipe part and the branch part of the main body part with a heat insulating material;
A step of forming a first racking cover by winding a resin sheet material for forming a first racking cover formed in a developed shape of the first racking cover into a tubular shape so as to surround the straight pipe heat insulating portion of the heat insulating layer; ,
A resin sheet material for forming a second racking cover having a cover body portion forming portion and a skirt portion forming portion formed in a developed shape of the second racking cover, and the branch tube portion heat insulating portion of the heat insulating layer at the cover body portion forming portion. Providing the skirt part formed by the skirt forming part so as to overlap the opening peripheral edge of the first racking cover from the outside at the same time surrounding and forming the cover main body part;
A lower hole is formed in a portion where the skirt portion and the skirt portion of the first racking cover overlap, and a rivet or a tapping screw is fitted or screwed from the skirt portion side toward the first racking cover through the lower hole, A branch pipe joint manufacturing method comprising a step of fixing the portion and the first racking cover with rivets or tapping screws. In a state where the skirt portion of the second racking cover has drawn a fold line along the boundary between the cover body portion forming portion and the skirt portion forming portion, the second racking cover forming resin sheet material, The cover body portion forming portion and the skirt portion forming portion are formed into a cylindrical body, and
The holding jig and the cover main body forming portion are arranged with a clamping jig in a state where the holding jig having a shape along the folding line of the cylindrical body is disposed on the cover main body forming portion side along the bending line. After being sandwiched and heated so that at least a portion along the fold line can be bent, the skirt forming portion is cooled along the fold line in the direction of the holding jig, and then the opening of the first racking cover is formed. 6. The method for manufacturing a branch pipe joint according to claim 5, wherein the branch pipe joint is formed through a step of deforming into a saddle shape that conforms to a wall shape around the periphery. Tubular formed in a shape in which the holding jig has the same inner diameter as the outer diameter of the branch tube heat retaining portion, and the tube end portion is along the branch intersection of the straight tube portion heat retaining portion and the branch tube portion heat retaining portion of the heat retaining layer. A holding jig,
The cylindrical body of the second racking cover forming resin sheet material formed so that the cover body portion forming portion and the skirt portion forming portion are cylindrical, the fold line is along the branching intersection of the tubular holding jig The method of manufacturing a branch pipe joint according to claim 6, wherein the branch pipe joint is deformed into a saddle shape while being inserted into a tubular holding jig along the pipe end.

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