JP4866318B2 - Packing for fireproof composite pipe - Google Patents

Description

  The present invention relates to a fireproof composite pipe packing that is attached to a fireproof composite pipe having an inner pipe and an outer pipe formed by molding a fireproof material on the outer periphery of the inner pipe.

  As a fireproof composite pipe, for example, an outer layer pipe made of mortar having excellent fire resistance is formed on the outer periphery of an inner pipe made of vinyl chloride resin having excellent water resistance and chemical resistance. Such a fire-resistant composite pipe is formed of a mold, a packing, and an inner-layer pipe, in which an inner-layer pipe that is externally fitted with a gasket for fire-resistant composite pipe (hereinafter sometimes simply referred to as “packing”) is disposed in the mold. The outer layer pipe is formed by pouring mortar or the like into the space to be cured and curing the mortar or the like.

  For this reason, the conventional packing is not particularly fixed to the outer layer pipe of the refractory composite pipe, and there is a problem that the packing peels off from the outer layer pipe and falls off from the inner layer pipe at the time of piping construction of the refractory composite pipe. It was.

  In order to solve this problem, a gasket for a fireproof composite pipe has been proposed in which an anchor projection is provided on a contact surface that comes into contact with an outer layer pipe of the fireproof composite pipe (see, for example, Patent Document 1). In this packing, a so-called anchor effect can be generated between the packing and the outer layer pipe by hardening the anchor protrusion in a state where the anchor protrusion is bitten into the outer layer pipe.

Utility Model Registration No. 3126548

  However, in the packing for fireproof composite pipe described in Patent Document 1, there is almost no air escape space in the space when the mortar is poured into the space formed by the mold, the packing, and the inner layer pipe, and the mortar is not anchor anchor projection. There was a risk of curing without spreading all around. For this reason, the anchor protrusions have not sufficiently penetrated into the outer layer pipe, and it has not been possible to completely prevent the packing from dropping from the fireproof composite pipe during piping construction.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a packing for a fireproof composite pipe that is more difficult to drop off from the fireproof composite pipe.

Characteristic feature of the refractory packing composite tube according to the present invention, the inner layer pipe, and said to inner tube refractory composite pipe the refractory material with a mold molded outer tube to the outer circumferential surface of the molding of the outer layer tube In this case, a gasket for a fireproof composite pipe that is attached to the end surface of the outer layer pipe along the outer peripheral surface, the contact surface contacting the end surface, the inner peripheral surface facing the outer peripheral surface, and the contact formed on the surface, an inlet portion of the refractory material during molding of the outer layer tube flows, is formed in the inlet portion, said a communication portion for communicating with surface different from the contact surface, the inner peripheral surface And a rib that is formed and protrudes toward the outer peripheral surface .

As in this configuration, an inflow portion into which the refractory material flows is provided on the contact surface that comes into contact with the outer layer tube, and a communication portion that communicates with a surface different from the contact surface is provided in the inflow portion, thereby forming the outer layer tube into a mold. When molding, since the refractory material can be filled while letting the air in the mold escape from the communicating portion, the refractory material can be reliably filled to the inflow portion.
Therefore, when the refractory material is cured, a part of the outer layer pipe is fitted into the packing for the fire resistant composite pipe, and therefore the fire resistant composite pipe packing is difficult to drop off from the fire resistant composite pipe due to the anchor effect on the outer layer pipe.

The inflow portion is preferably a plurality of recesses formed in the contact surface along the circumferential direction .
By forming the inflow portion as a recess as in this configuration, the refractory material reliably accumulates in the recess and hardens, so that a higher anchor effect can be obtained. Moreover, the anchor effect with respect to an outer layer pipe | tube can be heightened by providing multiple recessed parts in the circumferential direction.

It is preferred that the front Killen communication portion is a hole portion formed in a portion of the recess.
By providing a hole in a part of the recess as in this configuration, it is possible to escape the air while accumulating the refractory material in the other part of the recess, so a high anchoring effect on the outer tube by hardening the refractory material Can be generated. Further, the communication portion may be a groove provided in a part of the recess, and in this case, the same effect can be obtained.

It is preferable that the groove portion communicates with the inner peripheral surface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the configurations described in the following embodiments and drawings, and various modifications can be made without departing from the spirit of the present invention.
Here, a case where the fireproof composite pipe packing (hereinafter referred to as “packing”) 100 according to the present invention is applied to a fireproof double-layer pipe joint 300 as a fireproof composite pipe as shown in FIGS. 4 and 5 will be described as an example. To do.

A fireproof two-layer pipe joint 300 to which the packing 100 according to this embodiment is applied includes an inner layer pipe 301 made of a synthetic resin such as hard vinyl chloride, and an outer layer pipe formed by molding a refractory material such as mortar on the outer periphery of the inner layer pipe 301. 302 is used in the same manner as a fireproof two-layer pipe 500 including an inner layer pipe 501 and an outer layer pipe 502.
In the fireproof two-layer pipe joint 300, the inner layer pipe 301 and the outer layer pipe 302 are provided so that the diameters of the inner layer pipe 301 and the outer layer pipe 302 are expanded at a portion where the fireproof two layer pipe 500 is joined. It can be inserted.

  The packing 100 is formed of, for example, synthetic rubber such as polyethylene, synthetic resin, or the like, and the outer layer pipe is formed at a portion where the outer layer pipe 302 and the outer layer pipe 502 of the fire resistant two-layer pipe 500 face the fire-resistant two-layer pipe joint 300. It is attached in contact with 302. The packing 100 is attached to the fireproof two-layer pipe joint 300 when the outer layer pipe 302 is molded. For example, as shown in FIG. 6, an outer fitting of the packing 100 to the inner layer pipe 301 is placed in the mold 400, and mortar or the like is formed in a space formed by the mold 400, the packing 100 and the inner layer pipe 301. Fill with refractory material and let it harden.

As shown in FIGS. 1 to 5, the packing 100 includes a contact surface 10 that contacts the end surface of the outer layer tube 302, an outer surface 20 that is substantially parallel to the contact surface, an inner peripheral surface 30, and an outer peripheral surface 40.
The contact surface 10 is provided with nine recesses 11 at equal intervals in the circumferential direction as inflow portions into which a refractory material such as mortar flows during molding of the outer tube 302. The shape of the opening surface of the recess 11 is elliptical, and is provided so that the area of the cross section parallel to the opening surface of the recess 11 is equal along the depth direction of the recess 11. In addition, each bottom surface 12 of the recess 11 is provided with a hole portion 13 as a communication portion that communicates with an outer surface 20 which is an example of a surface different from the contact surface 10.

The inner circumferential surface 30 is provided with a plurality of ribs 31 in the circumferential direction for absorbing the dimensional tolerance of the outer diameter of the inner layer tube 301. Further, the corners of the inner peripheral surface 30 and the contact surface 10 are chamfered so that the fireproof composite tube packing 100 can be easily fitted on the inner layer tube 301.
The outer peripheral surface 40 is formed in a taper shape whose diameter is reduced from the contact surface 10 side to the outer surface 20 side.

  The dimensions of the packing 100 vary depending on the dimensions of the fireproof two-layer pipe joint 300 to be attached, and are not particularly limited. In this embodiment, the inner diameter of the packing 100 is 125 mm, the outer diameter is 140 mm, and the thickness is 5 mm. The major axis of the opening surface of the recess 11 is 10 mm, the minor axis is 5 mm, the depth is 5 mm, and the inner diameter of the hole 13 is 1 mm.

  As shown in FIG. 6, the packing 100 configured in this way is filled with mortar or the like through a filling port 401 in a space formed by the packing 100, the inner layer tube 302, and the mold 400 when the outer layer tube 302 is formed. The air in the space (including the inside of the recess 11) escapes to the outer surface 20 side through the hole 13, and the mortar and the like are filled up to the recess 11. For this reason, after mortar etc. harden | cure and the outer layer pipe | tube 302 is formed, a part of outer layer pipe | tube 302 will be in the state fitted to the recessed part 11 of the packing 100. FIG. Therefore, the packing 100 can be made difficult to fall off the fireproof composite pipe due to the anchor effect on the outer layer pipe 302.

At this time, the rib 31 provided on the inner peripheral surface 30 of the packing 100 can create a gap between the inner peripheral surface 30 and the inner layer pipe 301, so that not only the dimensional tolerance of the inner layer pipe 301 is absorbed, Air in the mold 400 can also escape.

  Further, when the mold 400 is clamped, the outer peripheral surface 40 may be scraped by the mold 400, which causes a problem of scrap disposal. For this reason, if the outer peripheral surface 40 is tapered as in this embodiment and the area in contact with the mold 400 is reduced, the area of the outer peripheral surface 40 cut by the mold 400 is reduced and the amount of chips is reduced. Can do.

[Another embodiment]
In the above embodiment, the case where the hole portion 13 is provided in the bottom surface 12 of the recess 11 as the communication portion has been described as an example. However, the present invention is not limited to this, and examples of the communication portion include those shown in FIGS. It can also be set as the groove part 14 connected to the internal peripheral surface 30 from each side surface 15 of the concave part 11. In this case, the air at the time of forming the outer layer pipe 302 escapes from the groove portion 14 to the inner peripheral surface 30 side, so that mortar or the like can flow into the concave portion 11. In this case, it is preferable to provide a rib on the inner peripheral surface 30 because air from the groove portion 14 is more easily removed.

In the above embodiment, the case where nine concave portions 11 are provided in the circumferential direction has been described as an example. However, the number of the concave portions 11 is not particularly limited, and can be appropriately changed according to the size of the packing 100 or the like.
The shape of the opening surface of the recess 11 is not limited to an elliptical shape, and may be arbitrarily selected from a perfect circle shape, a square shape, and the like, and may be a groove shape extending in the circumferential direction. Further, the concave portion 11 can be tapered so that the inner peripheral surface becomes deeper or smaller in diameter as the inner peripheral surface becomes deeper along the depth direction of the concave portion 11.

  In the above embodiment, the case where the concave portion 11 is provided as the inflow portion has been described as an example. However, the inflow portion may be a hole portion provided with a through hole in the entire bottom surface 12 of the concave portion 11.

  In the above embodiment, the case where the packing 100 is applied to the fireproof two-layer pipe joint 300 has been described as an example. However, the packing 100 may be applied to the fireproof two-layer pipe 500. Further, the present invention can be applied not only to a fire-resistant double-layer pipe composed of an inner-layer pipe 301 and an outer-layer pipe 302 but also to a fire-resistant composite pipe having three or more layers.

  The packing for fireproof composite pipes according to the present invention can be applied to fireproof composite pipes such as utility pipes, air conditioning vent pipes, power distribution pipes and the like disposed in buildings.

Top view of packing according to this embodiment Side view of packing according to this embodiment The perspective view of the packing which concerns on this embodiment The perspective view which shows the state which attached the packing which concerns on this embodiment to the fireproof composite pipe Sectional drawing which shows the state which attached the packing which concerns on this embodiment to the fireproof composite pipe Schematic diagram showing the process of manufacturing refractory composite pipes Plan view of packing according to another embodiment Side view of packing according to another embodiment Perspective view of packing according to another embodiment

Explanation of symbols

10 Contact surface 11 Concave portion (inflow portion)
12 bottom 13 hole (communication part)
14 Groove (communication part)
DESCRIPTION OF SYMBOLS 15 Side surface 20 Outer surface 30 Inner peripheral surface 31 Rib 40 Outer peripheral surface 100 Packing for fireproof composite pipes 300 Fireproof two-layer pipe joint (fireproof composite pipe)
301 Inner layer tube 302 Outer layer tube 400 Mold

Claims (5)

Inner tubes, and said to inner tube refractory composite pipe the refractory material with a mold molded outer tube to the outer peripheral surface of, during molding of the outer layer tube, wherein the outer layer along the outer circumferential surface A fireproof composite pipe packing attached to the end face of the pipe,
A contact surface that contacts the end surface ;
An inner peripheral surface facing the outer peripheral surface;
Wherein formed on the contact surface, an inlet portion of the refractory material during molding of the outer layer tube flows,
A communicating portion formed in the inflow portion and communicating with a surface different from the contact surface ;
A fireproof composite pipe packing comprising: a rib formed on the inner peripheral surface and protruding toward the outer peripheral surface . 2. The fireproof composite pipe packing according to claim 1, wherein the inflow portion is a plurality of recesses formed in the contact surface along a circumferential direction . 3. The packing for a fireproof composite pipe according to claim 2, wherein the communication part is a hole provided in a part of the recess . The packing for a fireproof composite pipe according to claim 2, wherein the communication part is a groove provided in a part of the recess. The packing for a fireproof composite pipe according to claim 4, wherein the groove communicates with the inner peripheral surface.

Images