JP2019060200A - Socket-shaped fireproof two-layered pipe incorporating fireproof thermal expansion material - Google Patents

Abstract

To provide an inexpensive fireproof two-layered pipe having superior sound insulating property capable of completing a piping work by just connecting the fireproof two-layered pipe incorporating a fireproof thermal expansion material to an incombustible drain pipe joint.SOLUTION: A fireproof two-layered pipe comprises: a vertical drainage pipe made of a synthetic resin having a socket-shaped connection end arranged on its upper part so as to receive a connection end of a lower part of an incombustible drain pipe joint, the socket-shaped connection end having a rubber ring to seal a gap therebetween; a fireproof thermal expansion material disposed on an outer periphery of a constricted part of the socket-shaped connection end so as to close the connection end by expanding by heat of a fire; a short cylindrical fiber-mixed mortar layer covering the peripheral surface of the socket-shaped connection end and the fireproof thermal expansion material; and a straight pipe made of a fiber-contained mortar covering the vertical drainage pipe. The lower end face of the fiber-mixed mortar layer is placed on the upper face of the straight pipe.SELECTED DRAWING: Figure 3

Description

  The present invention provides a fireproof double-layer pipe having a socket-shaped connecting end for connection to a drainage pipe joint, that is, a fireproof outer tube made of a fiber-containing mortar made of synthetic resin drainage vertical pipe forming an inner pipe. The present invention relates to a fireproof double-layered pipe which is a double-layered pipe covered with a pipe and which incorporates a fire-resistant thermal expansion material for closing a drainage pipe in case of fire to prevent diffusion of fire damage.

  In the past, pipes using synthetic resin pipes installed through fire protection sections such as floor slabs of high-rise houses are pipe lines so that fire damage does not spread to upper floors through fire protection sections at the time of fire. It is requested for disaster prevention to provide a means to close the In order to satisfy this demand, for example, non-combustible drainage pipe joints such as fireproof double-layer pipe joints and cast iron joints are embedded in floor slabs of high-rise houses, and flammable drainage pipes made of synthetic resin are connected to these joints If a pipe is to be constructed, a holder containing a refractory thermal expansion material is provided around the connection port of the drainage pipe joint, and in the case of a fire, the drainage vertical pipe is softened by the heat of the fire. It has been proposed that the thermal expansion material squeezes to close the pipeline (see Patent Document 1).

  This patent document 1 relates to a joint, and does not relate to a fireproof double-layer pipe, but a connection structure in which a socket-shaped connection end of a drainage vertical pipe is inserted into a socket-shaped connection end of a drainage pipe joint The thermal expansion material is attached to the joint so that the drainage vertical pipe can be crushed by a holding fitting provided at the drainage pipe joint.

  On the other hand, as a connection structure of the drain pipe joint and the drainage vertical pipe, as shown in FIG. 1, the connection end d of the cast iron drain pipe joint c is formed in a male shape, and the connection end d is formed in a receiving port shape There is also known a structure in which the connection end b of the vertical drainage pipe a made of synthetic resin is fitted, but in this case, a tubular rubber ring e is provided inside the connection end b of the receptacle shape to connect piping It is necessary to maintain the watertightness of the part, and the fireproof thermally expandable material g that closes the pipeline in the event of fire is the drainage vertical pipe a at the outer periphery of the drainage vertical pipe a and below the connection end b. In the event of a fire, the thermal expansion material g squeezes the drainage vertical pipe a to occlude the pipe as shown in FIG. There is. The shape of the receiving port is formed by heating the end of the straight drained vertical pipe and pressing and expanding it with a jig, and the size of the receiving port is slightly different for each drained vertical pipe, so the holding bracket There is a gap between it and f. Moreover, in this connection configuration, when the rubber ring e burns due to the heat of fire, a gap is generated between the fitting f and the joint c, and it is thought that the hot air of the fire blows into the joint c from the gap h. This is undesirable because it causes damage to upper floors. In addition, since the drainage vertical pipe a in this example is a single pipe made of synthetic resin that is only partially covered with the retaining bracket f and is not a fireproof double-layered pipe covered with an outer pipe made of fiber mixed mortar The noise generated by the drainage flowing in the drainage vertical pipe a can not be prevented. The holding bracket f is fixed to the floor slab j by the support member i so as not to fall even if the drainage vertical pipe a is melted by fire.

  The refractory thermal expansion material in these conventional examples is a comparison of vulcanized rubber and the like with thermal expansion raw materials such as oxidized graphite in order to facilitate its handling and to maintain lumps so as not to disperse at the time of thermal expansion. Are known to be processed into sheet form and ring form by adding highly expensive additives, and further, as a substitute for the thermal expansion material, graphite powder oxidized in a tape of aluminum foil folded inwards And the like, which has the configuration of a band-like bag in which a thermal expansion raw material is enclosed, etc., and an advantage of obtaining expansion at high magnification, low cost and small volume is also proposed (Patent Document 2).

Patent No. 4907499 Patent No. 5451064

  In order to squeeze the drainage vertical pipe having the above-mentioned socket-shaped connection end in the event of a fire and close the pipe line, not only connecting the drainage vertical pipe to the drainage pipe joint but also surrounding the connection end It is necessary to attach the holding bracket holding the thermal expansion material, and the connecting operation is complicated and time-consuming, so that the piping cost becomes high and there are many parts needed for the piping operation. It is troublesome to manage, and there is a drawback that the drained vertical pipe made of bare synthetic resin without covering is much worse in sound insulation than the fireproof double-layer pipe. Furthermore, since the dimensional error of the connection end of the drainage vertical pipe is large, a gap is formed between the connection end and the holding bracket, so that the outside air is easily infiltrated. Condensation occurs, which is disadvantageous in that the thermally expandable material in the holding member is degraded.

  As means for solving these drawbacks and disadvantages, the inventors have proposed a socket-shaped connection end for receiving the lower connection end of the non-combustible drainage pipe joint provided vertically through the floor slab of the building structure. And a synthetic resin drainage vertical pipe provided with a rubber ring that seals between the drainage pipe joint and the socket-shaped connecting end, and expansion due to the heat of the fire to close the connecting end A refractory thermal expansion material disposed around the constriction of the socket-shaped connecting end and the outer periphery in the vicinity, the circumferential surface of the socket-shaped connecting end, and the heat-resistant thermal expansion material Fireproof two having a short cylindrical fiber-containing mortar layer, and a fiber-containing mortar straight pipe coated with the receiving end of the drainage vertical pipe and a portion excluding the lower end of the drainage vertical pipe A layer pipe, wherein the short cylindrical fiber-containing mortar layer is formed around the connection end. Was formed by injection molding, considered that further even if erosion drainage vertical pipe made of synthetic resin by fire supported by the supporting member so as not to drop this fiber incorporation mortar layer on the floor slab.

However, the step of forming the short cylindrical fiber-containing mortar layer by injection molding around the connection end becomes large, and the work of attaching the support member to the floor slab takes a considerable amount of time, which is not preferable. It was also assumed that the mixed mortar layer would crack in the event of a fire, making it impossible to carry out a satisfactory closure.

The present invention can finish the piping work without requiring a special support member simply by connecting the receptacle-shaped connecting end of the fireproof double-layer pipe incorporating the fireproof thermal expansion material to the noncombustible drainage pipe joint. It is an object of the present invention to provide a fireproof double-layer pipe having a socket-shaped connection end which has good sound insulation and can be manufactured inexpensively.

In the present invention, in order to solve the above problems, the upper portion of the socket is provided with a socket-shaped connecting end for receiving the lower connection end of the non-combustible drainage pipe joint provided vertically through the floor slab of the building structure. In addition to the drainage vertical pipe made of synthetic resin provided with a rubber ring that seals between the drainage pipe joint and the socket-shaped connecting end, and the socket for expanding by the heat of the fire and closing the connecting end. Fire-resistant thermal expansion material disposed around the periphery of the constriction of the connection end of the shape or around it, a short cylinder covering the peripheral surface of the connection end of the receptacle shape and the fire-resistant thermal expansion material Fireproof double-layered pipe having a fiber-containing mortar layer and a straight pipe made of a fiber-containing mortar covering the receiving end of the drainage vertical pipe and a portion other than the lower end of the drainage vertical pipe Placing the lower end surface of the short cylindrical fiber-containing mortar layer on the upper end surface of the straight pipe It was so. It is preferable to form in the lower end surface of the short cylindrical fiber-containing mortar layer an annular groove into which the upper end of the straight pipe is fitted when placed above, and the short cylindrical fiber-containing mortar layer May be formed of divided cylindrical pieces vertically divided in the cylinder axial direction, and a stepped portion which extends in the cylindrical axial direction to prevent communication between the inside and outside of the cylinder may be formed on the mating surfaces of the divided cylindrical pieces. The elastic band may be wound around the outer periphery of the divided cylindrical piece and fixed in a short cylindrical shape. A fire protection flange is formed around the upper end of the short cylindrical fiber-containing mortar layer to cover the rubber ring and the upper end of the straight pipe, and the peripheral surface of the receiving end of the connection end and the fireproof thermal expansion. The material may be coated with the short cylindrical fiber-containing mortar layer through a sound insulation material such as felt or rubber. Further, the lower end portion of the short cylindrical fiber-containing mortar layer may be joined to the upper end portion of the straight pipe by mortar, and the refractory thermal expansion material is a refractory thermal expansion powder raw material such as oxidized graphite powder. Or a molded and processed product obtained by adding a vulcanized rubber to a refractory thermally expandable powder raw material.

  The fireproof thermally expandable material is disposed at or near the constriction of the receiving end of the drainage vertical pipe having low strength, and in the case of a fire, the drainage vertical pipe is expanded and softened to crush the drainage vertical pipe. The fireproof thermal expansion material is covered with a short cylindrical fiber-containing mortar layer which is occluded but whose expansion force is directed to the direction of the drain vertical pipe. When the synthetic resin socket-type connection end is melted away by the heat of the fire, the short tubular fiber-containing mortar layer covering the periphery drops in a floating state, resulting in the connection end due to the thermal expansion of the raw material The department's blocking effect can not be realized. In order to prevent this fall, it was considered to support the mortar layer with a support member fixed to the floor slab, but this has the disadvantage that it takes a long working time as described above, and in the present invention, The lower end face of the short cylindrical fiber-containing mortar layer is placed on the upper end face of the straight pipe made of fiber-containing mortar, and the mortar layer is supported by the upper end face even if the drainage vertical pipe melts as described above The drop can be prevented without providing a special support member. Also, in normal times without fire, since the straight pipe with good sound insulation and the mortar layer cover the drainage vertical pipe, drainage noise flowing inside can be blocked. The fiber-containing mortar layer can be manufactured simply and inexpensively by cutting the fiber-containing mortar tube, and when the fiber-containing mortar layer is composed of divided cylindrical pieces, it can be manufactured easily and inexpensively by injection molding.

By forming an annular groove in the lower end surface of the short cylindrical fiber-containing mortar layer and inserting the upper end of the straight pipe into the groove, it is possible to prevent the fiber-containing mortar layer from falling off in the event of a fire. The short cylindrical fiber mixed mortar layer is constituted by divided cylindrical pieces vertically divided in the axial direction of the cylinder, and the non-combustible band is wound around the outer circumference of the divided cylindrical pieces and fixed in a short cylindrical shape, thereby the connection end A fire protection flange may be provided to cover the upper end of the part so as to cover the entire periphery of the connection end so as to cover it and improve fire resistance. When the fireproof thermal expansion material is covered with the mortar layer through a sound insulation material such as felt, the sound insulation performance is further improved.

  By bonding the lower end portion of the short cylindrical fiber-containing mortar layer to the upper end portion of the straight pipe with mortar, the free movement of the mortar layer and the straight pipe can be reliably prevented.

Cross-sectional view of a socket-shaped connection end with conventional thermal expansion means Cutaway side view of pipe line cut-off state in the configuration of FIG. 1 Partially cut side view showing an embodiment of a socket-type fireproof two-layer pipe of the present invention Sectional view of line 4-4 in FIG. 3 Side view of the usage condition of the receptacle-type fireproof two-layer pipe of the present invention Sectional view of the upper connection of FIG. 5 Cross-sectional view of the lower connection portion of FIG. 5 Front view of the band-like bag used in the embodiment of FIG. 3 The enlarged sectional view of the 8-8 line portion of FIG. 8 Partially cut side view of another embodiment of the present invention Partially cut side view of still another embodiment of the present invention Partially cut side view of a modification of the present invention The cut side view which shows the working condition of the receptacle type fireproof two-layer pipe of this invention

  The embodiment of the present invention will be described with reference to FIG. 3. In the figure, reference numeral 1 indicates a receptacle-shaped fireproof two-layer pipe containing a fireproof thermal expansion material, and the fireproof two-layer pipe 1 is made of synthetic resin. A drainage tube 2, a fireproof thermal expansion material 3 comprising oxidized graphite, a short cylindrical fiber-containing mortar layer 4, and a fiber-containing mortar for covering the straight tubular main portion of the drainage vertical tube 2 A straight pipe 5 is provided.

  As shown in FIGS. 5 to 7, the receptacle-type fireproof two-layer pipe 1 is a non-combustible such as a cast iron joint or a fireproof two-layer pipe joint provided vertically through the floor slab 6 of the building structure. Between the lower socket-shaped connection end 8a of the flexible drainage pipe joint 7a and the upper socket-shaped connection end 8b of the non-combustible drainage pipe joint 7b provided on the floor slab 9 of the lower floor thereof It is piping and constitutes a drainage pipeline.

  In order to receive the lower connection end 8a of the drainage pipe joint 7a, the upper part of the drainage vertical pipe 2 made of synthetic resin is expanded to a large diameter to form a receptacle-shaped connection end 10, and this connection end Inside the portion 10, a rubber ring 11 is provided which seals between the connection end 8a of the drain fitting 7a inserted therein. Further, the lower end portion 12 of the drainage vertical pipe 2 constituting the fireproof two-layer pipe 1 is inserted into the receiving end 8b of the outlet pipe joint 7b of the floor slab 9 of the lower floor, as seen in FIG. Be done.

  As shown in FIG. 3, the short cylindrical fiber-containing mortar layer 4 has an inner wall 15 having a curved surface 17 substantially along the peripheral surface shape of the neck portion 14 from the connection end 10 of the drainage vertical pipe 2 and a cylinder. The fiber-containing mortar layer 4 in this embodiment has a cylindrical shape in which the divided cylindrical pieces 4a and 4a divided in the cylinder axial direction are butted as shown in FIG. A non-combustible band 28 was circulated around the circumference to form a short cylinder. The divided cylindrical piece 4a is formed by injection molding and then dried and cured. Then, an annular groove 33 into which the upper end portion of the straight pipe 5 made of mortar is inserted is formed in the lower end surface 32 of the mortar layer 4, and the mortar layer 4 is placed on the upper end portion of the straight pipe 5. Since the mortar layer 4 and the straight pipe 5 are engaged with each other by the fitting, the mortar layer 4 does not fall off even if the drainage vertical pipe 2 is melted in the event of a fire, and the mortar layer 4 does not fall off. The stable position on the pipe 5 prevents the flame from entering the inside of the drain joint 7a, and the straight pipe 5 also engages with the connection end 8a of the drain joint 7a through the mortar layer 4 The inclination is prevented. In addition, the step part 30 which extends in the cylinder axial direction and prevents communication between the inside and outside of the cylinder is formed on the mating surface 29 of the divided cylinder pieces 4a. Further, a fire protection flange 31 covering the upper ends of the rubber ring 11 and the straight pipe 5 is formed on the upper end peripheral edge of the divided cylindrical piece 4a so that the rubber ring 11 and the straight pipe 5 can be protected from fire in the event of a fire. did.

  The refractory thermal expansion material 3 is preferably constituted by a band-like bag in which a refractory thermal expansion powder raw material such as oxidized graphite powder is enclosed, or a molded processed product obtained by adding a vulcanized rubber to the refractory thermal expansion powder raw material The embodiment in the case of being configured as the band-shaped bag 3a is as shown in FIGS. 8 and 9, and the embodiment in the case of being configured by the molded processed product 3b is shown in FIG. The band-like bag 3a shown in FIGS. 8 and 9 is a product obtained by sealing a commercially available oxidized graphite powder 20 with a long aluminum foil tape 19 folded in three and sealing both ends, and the folded three-folded one The surface 21 is made to face the circumference of the constriction 14 and circulated, covered thereon, pressed down with the adhesive tape 18, and stuck as seen in FIG. The short cylindrical fiber-containing mortar layer 4 is provided so as to cover the pasted band-like bag 3a and the connection end 8a. When the powder raw material 20 expands toward the neck portion 14, the aluminum foil tape 19 pushes open the surface 21 just overlapping and expands rapidly. Further, as the molded processed product 3b, for example, a commercially available product obtained by molding and processing a vulcanized rubber mixed with oxidized graphite powder is used.

  The refractory thermal expansion material 3 may be provided at a position slightly away from the narrow portion 14 of the drainage vertical pipe 2 as shown in FIG. 10, and the circumferential surfaces of the thermal expansion material 3 and the connection end 10 are As shown in FIG. 11, when the sound insulation material 34 such as felt or rubber is covered, and the mortar layer 4 is covered thereon, the sound insulation property is further improved.

  In the short cylindrical fiber-containing mortar layer 4, a fiber-containing mortar tube may be cut as shown in FIG. 12 and may be joined to the upper end portion of the straight pipe 5 with a mortar 36. As the refractory thermal expansion material 3 in the same figure, a commercially available molded and processed product 3b is used which is formed by mixing a thermal expansion material such as oxidized graphite powder with a vulcanized rubber or a synthetic resin.

  The fireproof double-layer pipe of the present invention having the configuration shown in FIG. 3 is connected between the drainage pipe joints 7a and 7b provided on the floor slabs 6 and 9 of the upper and lower floors as shown in FIG. When a fire occurs, as shown in FIG. 13, the refractory thermal expansion powder material 20 in the band-like bag 3 expands to close the opening of the drain pipe joint 8a. In such a fire, the flame ascends in the room and passes over the fireproof double-layer pipe 1, and the rubber ring 11 is burnt out. As a result, the receiving end 10 of the drainage vertical pipe 2 is melted, but In this case, since the portion covered with the fire resistant good mortar straight pipe 5 is free from erosion, the straight pipe 5 is in the upright state, and the mortar layer 4 is engaged with the annular groove 33 Since the supporting member for preventing the fall of the mortar layer 4 is not required because it is supported by the upper end and does not fall, the piping operation can be completed easily. The code | symbol 25 is a looseness prevention material which consists of a rubber band interposed so that this straight pipe 5 may not move along the peripheral surface of the drainage vertical pipe 2. As shown in FIG. The straight pipe 5 covers the straight pipe portion 26 excluding the drainage vertical pipe 2 connection end portion 10 and the lower end portion 12, and the straight pipe portion 26 is protected by fire when a fire occurs.

  In the fireproof double-layered pipe 1 having the configuration shown in FIG. 3, the thermal expansion of 100% of graphite oxide is made on the aluminum foil tape 19 whose drainage vertical pipe 2 has an aperture of 100 mm and the strip 3 is 20 microns thick and 7.5 cm wide. The powder raw material 20 was uniformly dispersed and trifolded, and the mortar layer 4 had a thickness of 14 to 30 mm. The fireproof double-layered pipe 1 was connected to a noncombustible drainage pipe joint, and a fire resistance test was conducted based on a predetermined fire resistance test method. The test temperature was raised according to the ISO834-1 standard heating curve. After 20 minutes, the drainage vertical pipe 2 starts to carbonize, and when 25 minutes elapse, the thermally expanded powder raw material 20 starts to expand, and the expanded particles enter the carbonized portion and the inside of the connection end 10 is shown in FIG. It was clogged up. The upper end portion of the straight pipe 5 was in a bonding state in the annular groove 33 of the mortar layer 4 and was not collapsed, and the rubber ring 11 was partially burned but the closed state was maintained.

1 port-type fireproof double-layer pipe, 2 drainage vertical pipe, 3 fireproof thermal expansion material, 3a band-shaped bag, 3b molded processed product, 4 short cylindrical fiber mixed mortar layer, 4a divided cylinder piece, 5 straight pipe, 6 Floor slab, 7a non-combustible drainage pipe joint, 8a lower socket-shaped connecting end, 10 drainage vertical pipe socket-shaped connecting end, 11 rubber ring, 12 drainage vertical pipe lower end, 14 necking, 20 Oxidized graphite powder, 21 folded on one side, 28 non-combustible bands, 29 mating surfaces, 30 steps, 31 fire flanges, 32 lower end faces, 33 annular grooves, 34 sound insulation, 36 mortars,

Claims (8)

  A receptacle-shaped connecting end for receiving the lower connection end of the non-combustible drainage pipe joint provided vertically through the floor slab of the building structure is provided on the top, and drainage is carried out in the receptacle-shaped connecting end A drainage vertical pipe made of synthetic resin provided with a rubber ring that seals between the pipe joint and the neck portion of the connection end of the socket type or the like so as to expand by heat of a fire and close the connection end. A fireproof thermal expansion material disposed around the outer circumference of the receptacle, a short cylindrical fiber-containing mortar layer covering the fireproof thermal expansion material, and a circumferential surface of the connection end of the receptacle shape; A fire-preventing two-layered pipe comprising: a straight pipe made of a fiber-containing mortar that covers a portion other than the socket-shaped connecting end of the pipe and the lower end of the drainage vertical pipe; The lower end face of the layer is placed on the upper end face of the straight pipe It built the socket-shaped refractory two-layer tube.   The fireproof thermally expandable material according to claim 1, wherein the lower end surface of the short cylindrical fiber-containing mortar layer is formed with an annular groove into which the upper end portion of the straight pipe is fitted when placed above. Socket type fireproof two-layer pipe built-in.   The short cylindrical fiber-containing mortar layer is constituted by divided cylindrical pieces vertically divided in the cylinder axial direction, and a noncombustible band is wound around the outer circumference of the divided cylindrical pieces and fixed in a short cylindrical shape. The receptacle-type fireproof two-layer pipe which incorporated the fire-resistant thermal expansion material of Claim 1 or 2 characterized by the above-mentioned.   A receptacle according to claim 3, characterized in that a step which extends in the axial direction of the cylinder and prevents communication between the inside and the outside of the cylinder is formed on the mating surface of the divided cylinder pieces. Layer tube.   The fireproof thermal expansion material according to claim 1, wherein a fire prevention flange is formed around the upper end portion of the short cylindrical fiber mixed mortar layer to cover the upper end portion of the rubber ring and the straight pipe. Socket type fireproof double layer pipe.   The peripheral surface of the receiving end of the connection end and the refractory thermal expansion material are covered with the short cylindrical fiber-containing mortar layer through a sound insulating material such as felt or rubber. Socket-type fire-resistant double-layer pipe incorporating the heat-resistant thermal expansion material described above.   A receptacle-shaped connecting end for receiving the lower connection end of the non-combustible drainage pipe joint provided vertically through the floor slab of the building structure is provided on the top, and drainage is carried out in the receptacle-shaped connecting end Drainage tube made of synthetic resin with a rubber ring that seals between the pipe fitting and the neck or neck of the socket-shaped connecting end so as to expand by the heat of the fire and close the connecting end. A fire-resistant thermal expansion material disposed around the outer periphery thereof, a peripheral surface of a connection end of the receiving port, and a short cylindrical fiber-containing mortar layer covering the fire-resistant thermal expansion material; A fireproof double-layer pipe comprising: a straight pipe made of a fiber-containing mortar which covers the receiving end of the drainage vertical pipe and a portion excluding the lower end portion of the drainage vertical pipe; In particular, the lower end of the fiber mixed mortar layer is joined to the upper end of the straight pipe by mortar. Receptacle shaped refractory bilayer tube incorporating a refractory thermal expansion material to.   The above-mentioned refractory thermal expansion material is characterized by comprising a strip-like bag in which a refractory thermal expansion powder raw material such as oxidized graphite powder is enclosed, or a shaped processed product obtained by adding a vulcanized rubber to the refractory thermal expansion powder raw material. The receptacle-type fireproof two-layer pipe which incorporated the fire-resistant thermal expansion material of Claim 1 or 5.

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