JP2006329329A - Fireproof double tube joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fireproof double tube joint capable of preventing a tube diameter of a socket from being enlarged, and capable of exhibiting enhanced fireproofness, water-tightness and earthquake resistance. <P>SOLUTION: This fireproof double tube joint 1 is constituted by an inner tube 2 having the socket 3; a water stop ring 4 arranged on a surface of the socket 3; a cap 5 covering from an upper surface to an outer peripheral surface of the water stop ring 4, and an inner tube outer peripheral surface of the socket 3; and an outer tube 6 covering an outer peripheral surface of the cap 5 and an outer peripheral surface of the inner tube 2 extending to it. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fireproof two-layer pipe joint excellent in fire resistance, water tightness, and earthquake resistance.

In recent years, synthetic resin pipe joints frequently used in piping facilities for apartment buildings such as apartments and condominiums, office buildings, and the like are required to have fire resistance for fire prevention measures.
As such a fire-resistant pipe joint, as shown in FIG. 4, a synthetic resin pipe joint is used as the inner pipe 22, and an outer pipe 26 in which an incombustible material is molded with mortar is arranged on the outer peripheral surface thereof. Joints are known.
This conventional two-layer pipe joint has a structure in which a water stop ring 24 is mounted in a circumferential groove 20 provided on the inner peripheral surface of the receiving port of the inner pipe 22. However, the circumferential groove 20 has a drawback in that the outer peripheral surface of the receiving port of the corresponding inner tube 22 bulges in an annular shape, and the tube diameter of the receiving port is increased accordingly.

  In piping facilities such as apartment buildings that are subject to application of fireproof double-layer pipes, the placement positions of the through holes for piping provided in the reinforced concrete floor to connect the upper and lower floors are restricted by the reinforcing bars stretched in the floor In order to maintain the strength and sound insulation of the floor surface, it is desirable that the diameter be as small as possible. Pipe fittings with smaller diameters are also required.

Then, the fireproof double layer pipe which can make the pipe diameter of a receptacle part smaller than the said conventional double layer pipe joint is proposed. (See Patent Document 1)
This two-layer pipe joint is fitted with a sealing material on the opening peripheral edge of the receiving part, and covers from the peripheral edge of the sealing material to the outer peripheral surface of the outer tube with a fireproof cover formed of a stainless steel plate or the like. It is the structure which fixed to the outer pipe | tube of the receiving part with the screw material.
JP 2004-150621 A

  However, since the fireproof cover covers from the peripheral edge of the seal material to the outer peripheral surface of the outer tube, the external heat easily reaches the inner tube and the seal material through the fireproof cover. Since the structure is fixed to the outer tube, there is a problem that it lacks water tightness.

  An object of the present invention is to provide a fireproof two-layer pipe joint excellent in fire resistance, water tightness, and earthquake resistance without causing the outer peripheral surface of the receptacle of the inner pipe to bulge in an annular shape.

In order to solve the above-described problems, a fireproof two-layer pipe joint according to the present invention includes an inner pipe having a receiving port, a water stop ring disposed on the surface of the water receiving port, an upper surface to an outer peripheral surface of the water blocking ring, and further the receiving port. A cap that covers the outer peripheral surface of the inner tube, and an outer tube that covers the outer peripheral surface of the cap and the outer peripheral surface of the inner tube that follows the cap.
The water stop ring is preferably formed with an annular protrusion in the circumferential direction of the outer peripheral surface thereof.
The cap may be provided with a stepped portion that can be engaged with the receiving surface of the inner tube on the inner peripheral surface thereof, or may be provided with a taper on the inner peripheral surface thereof.

  According to the fire-resistant two-layer pipe joint of the present invention, compared to the conventional two-layer pipe joint, the pipe diameter of the receptacle can be reduced, so that the workability is good, and the fire-resistant two-layer pipe joint has excellent fire resistance, water tightness, and earthquake resistance. A layer pipe joint can be provided.

  The fireproof two-layer pipe joint of the present invention has a water stop ring arranged on the receiving surface of the inner pipe, and a cap that covers the water stop ring is joined and integrated with the outer peripheral surface of the inner pipe to It has been made smaller than the two-layer pipe joints, and the water stop ring, inner pipe and cap are covered with a non-combustible heat resistant outer pipe made of mortar, etc., thereby improving the shielding from external heat, It is characterized by improved heat resistance.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional view showing an example of the fireproof double-layer pipe joint of the present invention, and FIG. 2 is a partial enlarged cross-sectional view of the fireproof double-layer pipe joint of the present invention shown in FIG. FIG. 3 is a partially enlarged cross-sectional view showing another example of a cap and a water stop ring constituting the fireproof two-layer pipe joint of the present invention.

In FIG. 1, a fireproof two-layer pipe joint 1 of the present invention includes an inner pipe 2, a water stop ring 4 disposed on a surface of a receiving port 3 of the inner pipe 2, a cap 5 covering the water stop ring 4, It consists of an outer tube 6.
The cap 5 is formed so as to cover the outer peripheral surface from the upper surface of the water stop ring 4 and further the outer peripheral surface of the receiving port 3 of the inner tube 2, and the outer tube 6 includes the outer peripheral surface of the cap 5 and the inner tube following the outer surface. 2 is formed so as to cover the outer peripheral surface.

Unlike the conventional two-layer pipe joint, the inner pipe 2 is not formed with a circumferential concave groove for accommodating the water stop ring 4 on the inner peripheral face of the inner pipe receptacle 3, so that the outer circumference of the receptacle 3 There are no bulges.
The inner pipe of the present invention is formed of a synthetic resin such as hard polyvinyl chloride, acrylic, ABS, etc., as in the case of a conventional synthetic resin pipe.

  As shown in FIG. 2, the bottom surface of the base 7 is disposed on the receiving surface 8 of the inner tube 2, and the upper surface and the outer peripheral surface of the base 7 are covered with the cap 5. In addition, a protruding tip 9 is formed on the receiving port 3 side of the base 7, and the outer peripheral surface of another pipe (connecting tube) inserted into the receiving port 3 is elastically in close contact with each other so that the water tightness of the joint portion is maintained. It can be done.

As shown in FIG. 3, the water stop ring 4 may be provided with an annular projecting portion 10 on the outer peripheral surface of the base portion 7, thereby increasing the elasticity of the inner tube of the water stop ring 4 in the radial direction. Further, the watertightness and the earthquake resistance are further improved with respect to the other pipe (connection pipe) inserted into the receiving port 3.
The water stop ring according to the present invention includes NBR, SBR (styrene / butadiene rubber), EPDM (ethylene propylene rubber), silicone rubber and other rubber-based materials, vinyl chloride resin, EVA (ethylene-vinyl acetate copolymer) and the like. It is made of a flexible material such as a synthetic resin having elasticity.

  The cap 5 is a cylindrical body having an approximately L-shaped end cross section, and has a flange-shaped protruding side 11 from the peripheral edge of the upper opening toward the center. The protruding side 11 and the receiving port of the inner tube 2 A gap in which the base 7 of the water stop ring 4 can be fitted is provided between the surface 8 and the inner peripheral surface of the cap 5 is joined to the outer peripheral surface of the inner tube 2 and attached to the inner tube 2.

As shown in FIG. 3, this cap is provided with a step portion 12 that can be engaged with the receiving surface 8 of the inner tube 2 on the inner peripheral surface of the cap, and a water-stop ring is provided between the overhang side 11 and the receiving surface 8. It may be possible to maintain an optimum gap for inserting the four base portions 7.
Further, a taper may be provided on the inner peripheral surface of the cap so that the adhesive can easily enter, and the adhesive strength between the cap 5 and the inner tube 2 may be increased.
The cap 5 is formed of a synthetic resin such as hard polyvinyl chloride, acrylic, ABS, etc., like the inner tube.

  In addition, although the example which combined the thing which provided the protrusion part 10 in the water stop ring 4 and the thing which provided the step part 12 in the cap 5 was shown in FIG. 3, it is not limited to this combination, protrusion A combination of a water stop ring provided with a portion 10 and a cover material without a stepped portion, a combination of a water stop ring without a protruding portion and a cover material provided with a stepped portion, etc. It may be used for joints.

The outer tube 6 is a tubular body formed of an inorganic mortar or the like on the surface of a synthetic resin tube and provided with an incombustible layer. In principle, the upper end of the outer tube 6 is flush with the outer surface of the overhanging side 11 of the cover material.
As shown in FIG. 1, the fireproof two-layer pipe joint of the present invention has the inner peripheral surface of the cap 5 bonded and fixed to the outer peripheral surface of the inner tube 2, and is stopped in the gap between the cap 5 and the receiving surface 8 of the inner tube 2. In a state where the water ring 4 is disposed, the outer tube 6a is formed on the cap 5 and the inner tube 2 corresponding to the receiving port 3 following the cap 5 and joined and integrated using an adhesive.
Examples of the adhesive used here include vinyl chloride resin, epoxy resin, and acrylic resin.

  At the piping construction site, the fireproof two-layer pipe joint of the present invention gradually covers the outer tube 6b toward the receiving port from the end of the inner tube 2 cut at a desired length after fixing the outer tube 6a. To install.

In the refractory two-layer pipe joint according to the present invention, since the water stop ring is arranged on the surface of the inner pipe receptacle, the pipe diameter of the receptacle can be made smaller than that of the conventional two-layer pipe joint.
Moreover, since the cap that covers the water stop ring is made of the same synthetic resin as the inner pipe, the joint strength when joined and integrated with the inner pipe is high, and the water tightness of the pipe joint is high.
Furthermore, the water-stop ring, the cap that covers this, and the inner tube that is joined and integrated with this cap are all covered with a non-combustible and heat-resistant outer tube, so that it has a high barrier against external heat. The heat resistance of the joint itself is high.

  The fireproof two-layer pipe joint of the present invention can be used for piping equipment such as a drain pipe.

It is a fragmentary sectional view which shows an example of the fireproof two-layer pipe joint of this invention. It is a partial expanded sectional view of the fireproof two-layer pipe joint of this invention shown in FIG. It is a partial expanded sectional view which shows the other example of the cap and water-stop ring which comprise the structure of the fireproof two-layer pipe joint of this invention. It is a fragmentary sectional view showing the example of the conventional two-layer pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fireproof two-layer pipe joint of this invention 2, 22 Inner pipe 3 Receiving port 4,24 Water stop ring 5 Cap 6, 6a, 6b, 26 Outer pipe 7 Base of water stop ring 8 Receiving surface of inner pipe 9 Water stop ring Protruding tip 10 Annular projecting part 11 Overhang side 12 of cap 12 Step part 20 of cap Circumferential groove

Claims (4)

An inner pipe having a receiving port, a water stop ring arranged on the surface of the receiving port, a cap covering the outer peripheral surface from the upper surface of the water stop ring, and further, an outer peripheral surface of the inner pipe of the receiving port, A fireproof two-layer pipe joint comprising an outer peripheral surface of a cap and an outer pipe covering the outer peripheral surface of the inner pipe following the cap. The fireproof two-layer pipe joint according to claim 1, wherein an annular protrusion is formed in the circumferential direction of the outer peripheral surface of the water stop ring. The fireproof two-layer pipe joint according to claim 1 or 2, wherein a step portion that can be engaged with a receiving face of the inner pipe is provided on an inner peripheral face of the cap. The fireproof two-layer pipe joint according to any one of claims 1 to 3, wherein a taper is provided on the inner peripheral surface of the cap.

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