JP5248907B2 - Bendable fireproof double-layer pipe or fireproof double-layer pipe joint - Google Patents

Description

The present invention relates to refractory bilayer tube or refractory bilayer pipe joint hand bendable type piping pipe or fitting for tubes covered with fiber mixing mortar tube with synthetic resin flexible.

  Conventionally, as drainage pipes for apartment houses, hotels, hospitals, etc., fire-resistant double-layer pipes are used in which the inner pipe is made of rigid polyvinyl chloride and the outer pipe is made of fiber-mixed mortar pipe (see Japanese Patent Application Laid-Open No. 8-100801). ). This fireproof double-layer pipe can drain smoothly because the inner pipe is a rigid PVC pipe, and in the event of a fire, the outer pipe of the mortar pipe protects the inner pipe of vinyl chloride from the heat of the fire, and the drain pipe There is an advantage that fire damage can be prevented from reaching other floors, and recently, as seen in Fig. 1, this fireproof double-layer pipe can be installed through the building up and down Increasing the safety against fire by adopting not only the vertical pipe 1 but also the branch pipe 2 extending from the vertical pipe 1 to the bath, the toilet 3 and the kitchen in each floor has been increasing.

  Manifold pipe joints and elbows that cover joint pipes made of synthetic resin with fiber-mixed mortar are prepared to connect fire-resistant two-layer pipes. By using it for connecting the layered pipes, most of the piping system can have fire resistance. In order to coat the joint pipe with mortar, the joint pipe is placed in a mold of an injection molding machine, and pressurized mortar is injected. The joint pipe is made of a hard resin tube that does not deform due to the pressure applied during mortar injection, and the outer surface is entirely covered with dry and hard mortar. It is configured.

  In the design of piping systems, there is a desire to freely design the branch pipe angle and the positional relationship between the vertical pipes and the drainage outlets of household equipment such as toilets. To satisfy this demand, there are many types of angles. It is necessary to manufacture joints and elbows, which is not preferable because it causes high costs for fireproof double-layer pipe joints and the like. In addition, a meandering joint is required to cope with the position deviation between the branch pipe and the main pipe, and it is not preferable to make a joint that is suitable for the degree of position deviation and various pipe diameters because of cost and time. . Instead of rigid mortar coating and rigid PVC joint pipe, it is also possible to use a flexible pipe such as a synthetic resin bellows pipe as a joint pipe and to wind a lightweight fire resistant fiber directly on this pipe. Whereas the refractory temperature is about 200 degrees, the joint provided with the mortar coating has a fire resistance of 800 degrees or more and good heat insulation, so it is advantageous to provide the mortar coating from the viewpoint of safety. .

Since the outer tube of the mortar covering that constitutes the fireproof double-layer tube is rigid, the entire piping system is also rigidly configured, and the flexibility is poor. Recently, as shown in Fig. 2, a base-isolated building has been constructed that uses a base-isolated rubber 4 on the foundation of the building to reduce the shaking of the earthquake. If a rigid refractory double-layer pipe joint is used at the location where 1 and the drainage horizontal main pipe 5 are connected, it is expected to break due to earthquake vibration. The tube is prevented from being broken by the difference in vibration (see Japanese Patent No. 3725271). The joint 6 is usually a rubber bellows tube and is not provided with any special fireproof armor.
Japanese Patent Laid-Open No. 8-100801 Japanese Patent No. 3725271

  As mentioned above, conventional fire-resistant double-layer pipes and fire-resistant double-layer pipe joints lack flexibility and are limited to a specific degree of curvature. Has the inconvenience that a separate order is required, which takes time and costs. Moreover, there is no joint of this type that has both fire resistance and bendability, and the demand for improving the fire resistance of the piping system of the seismic isolation building cannot be satisfied. If the piping can be curved, it is convenient that the piping design and construction can be further facilitated.

The present invention is to overcome these disadvantages, etc., it is an object to provide a free curved obtained by refractory bilayer tube or refractory bilayer pipe joint hand rich in flexibility.

In the present invention, in order to solve the above-described problems, a plurality of short tubes made of fiber-mixed mortar are inserted into the outer periphery of a flexible pipe or joint tube, and the outer periphery is covered with a refractory fiber material. A bendable fireproof double-layer pipe or a fireproof double-layer pipe joint. As these pipes and joint pipes, flexible pipes made of synthetic resin, such as straight pipes, bellows pipes or curved pipes are used.

      As the refractory fiber covering the outer periphery, a refractory fabric or mesh impregnated with an adhesive is used.

  By forming one end face of the short tube made of fiber-mixed mortar on a mortar-shaped inclined surface inclined inward and forming the other end surface on a convex inclined surface inclined outward, the short tubes are curved It becomes difficult to produce a gap at the seam of the seam and fire resistance is improved. In this case, the convex surface of the other end surface is formed by attaching a refractory material having a smooth surface such as metal or ceramics, so that the short tubes can slide smoothly and have good flexibility. .

  A plurality of the short pipes are arranged at intervals, and these short pipes are connected to each other by a connecting member having a movable direction to constitute a unit unit, and the plurality of unit units are further connected to each other by the connecting member. When the cover frame has a curved structure that is connected so as to have a movable direction different from the movable direction of the unit unit itself, a gap can be held between the short pipes, so that flexibility is improved and the curved arrangement is provided. Short pipes can be arranged relatively easily around pipes and curved joint pipes.

  If this connecting member is composed of a fireproof fabric coated with an adhesive and impregnated with a tape layered with a mesh made of fireproof fibers, it is hard to burn out, and it is possible to ensure the connection of short pipes even in the event of a fire. Mobility is improved.

  Further, the piping having the above-mentioned covering frame is inserted into the outer periphery of a flexible pipe or joint tube, and the outer periphery of the covering frame is covered with a fire-resistant fiber material so that it can be bent and has fire-resistance. And pipe joints are obtained.

  The fireproof double-layer pipe or fireproof double-layer pipe joint of the present invention uses a flexible pipe as a pipe for pipe or joint, and a plurality of short pipes are inserted on the outer periphery thereof. Even if the connection ports and drain ports to be connected to each other are misaligned or there are obstacles in the piping path, these piping pipes, joint pipes and short pipes can be bent freely to connect the connection ports and drain ports. Can be connected to each other in a fireproof state. In addition, when a vibration such as an earthquake is applied to a fire-resistant double-layer pipe or a fire-resistant double-layer pipe joint, each short pipe vibrates individually, so that the short pipe can be prevented from being damaged. Fire resistance protection of Furthermore, by covering these pipes and joint pipes with the outer periphery of the short pipe with a refractory fiber, excessive movement of the short pipe is prevented, and the occurrence of a gap at the joint between the short pipes is prevented. The curved shape can be properly maintained. In addition, if there is a misalignment between the connection port for connecting the branch pipe provided in the drainage vertical pipe and the drainage port of the toilet bowl, conventionally, the connection port and the drainage port are only connected by a flexible pipe such as a synthetic resin bellows pipe. Although it was connected and lacked fire resistance, fire resistance improved dramatically by using the bendable fireproof two-layer pipe joint of the present invention, so that smoke and heat accompanying fire flowed into the drainage vertical pipe This can be prevented from burning out or flowing out to other floors.

  The fire-resistant fiber can be formed into a fabric or a mesh. When the fabric is coated and impregnated with a fire-resistant adhesive, the piping pipe or the joint pipe and the short pipe are adapted to a predetermined curved shape. After the pipe connection, the fabric can be wound around the outer periphery to constitute the joint of the present invention, and the work at the pipe connection site becomes possible. In addition, when a fireproof fiber such as glass fiber is formed into a mesh bag and the outer periphery of the short pipe is covered, the fireproof double-layer pipe and fireproof double-layer pipe joint are compared while maintaining the short pipe continuous without gaps. Because it can be curved freely, it can cope with the position shift of the connection port of various dimensions. In this case, it is possible to produce and provide a specific dimension of the factory, and to shorten the piping work time. effective.

  The short pipe can be manufactured by cutting a long fiber-mixed mortar pipe with a length of, for example, 25 mm and perpendicular to the central axis of the pipe, but cut perpendicular to the central axis of the pipe. Not only is it possible to form one end face of the short tube as a mortar-shaped concave face inclined inward, and the other end face as a convex face such as a convex inclined face or a saddle shape inclined outward. By arranging a plurality of short tubes with the mortar-shaped inclined surface and the convex surface facing each other, even if the pipe for piping and the pipe for fitting are curved, the short pipe is difficult to shift to the left and right, and it is covered continuously with the cylinder Since it is difficult to form a gap at the joint of the short pipe, heat can be prevented from acting on the joint pipe and the fire resistance is improved.

  A plurality of the short pipes are arranged at intervals, and these short pipes are connected to each other by a connecting member having a movable direction to constitute a unit unit, and the plurality of unit units are further connected to each other by the connecting member. A covering frame having a curved structure connected so as to be movable in a direction different from the moving direction of the unit unit itself is manufactured in advance, and after this is inserted into a flexible pipe or joint pipe, the covering frame By covering the outer periphery with a fireproof fiber material, it is possible to change the degree of curvature of the pipe and the joint pipe relatively freely even after the coating. By constructing this connecting member with a fire-resistant fabric coated with and impregnated with an adhesive and a tape layered with a mesh made of fire-resistant fibers, it is difficult to burn, and it is possible to ensure the connection of short pipes even in the event of a fire, Since the tape is relatively flexible, the mobility between the short tubes is improved.

  To connect multiple short pipes directly, a cylindrical connector made of a heat-expandable rubber material or synthetic resin material that has a short tube end insertion opening at both ends and a flexible portion at the middle is used. Then, it can connect easily, piping work improves, and a flexibility is also favorable.

  The embodiment of the present invention will be described with reference to the drawings. In the embodiment of FIG. 3, the center line of the branch pipe 2 made of a fireproof double-layer pipe and the center line of the discharge pipe 7 made of non-combustible material made of pottery of the toilet bowl 3 are shown. This is an example in which since a positional shift 9 is generated, a flexible joint pipe 6 made of a commercially available synthetic resin is fastened with a metal band 8 and connected by piping. In this case, the joint pipe 6 melts or burns due to the heat of the fire generated in the floor or downstairs where the toilet 3 is installed, smoke and flames flow through the branch pipe 2, and cause fire damage to the upper floor, Since the fire on the lower floor may cause damage to the floor where the toilet 3 is installed, in order to improve the fire resistance of the joint pipe 6 portion, a fiber as shown in FIG. A plurality of short tubes 10 made of mixed mortar were inserted, and the outer periphery thereof was further covered with a fire-resistant fiber material 11 such as a baked carbonized acrylic fiber cloth, whereby a bendable fire-resistant double-layer pipe joint 12 was obtained.

  The short pipe 10 is manufactured by cutting a fiber-mixed mortar pipe into, for example, a length of about 20 mm, and this is inserted into the outer circumference so that there is no gap when the joint pipe 6 is attached. Since the length of the short tube 10 is short, it can be disposed so as to surround the joint tube 6 according to the curvature of the joint tube 6, and the refractory fiber material 11 is wrapped around or wrapped around the short tube 10. By covering, the loose movement of the short pipe 10 is suppressed, and it is possible to prevent the occurrence of a gap through which the heat of the fire is transmitted at the contact portion between the short pipes. If various short pipes 10 having different diameters, lengths, and thicknesses are prepared, a fireproof layer can be formed corresponding to various curvatures of the joint pipe 6, and pipe connection work can be performed quickly. Can be obtained relatively easily and inexpensively by cutting fiber-mixed mortar pipes having various diameters and thicknesses, so that the piping cost is also low.

  The fire-resistant fiber material 11 is provided so as to cover the periphery of the short tube 10 using a fabric shape, a tape shape, a mesh shape, or the like. In the example of FIG. Was coated by winding. This incombustible tape has a structure as shown in FIG. 14, for example. A fired and carbonized acrylic fiber fabric 22 is impregnated with a flame retardant and pressure sensitive adhesive 23, and a glass fiber mesh 24 and The aluminum foil 25 was sequentially laminated and cut into a tape shape to form a non-combustible tape 21, which was covered with a short tube 10 wound around and bonded without any gap. In this case, since the layer of the aluminum foil 25 is a waterproof layer, it is possible to prevent the fabric adhesive force from deteriorating due to moisture.

  The embodiment shown in FIG. 5 is an example applied to a flexible joint pipe 6 connecting the vertical pipe 1 and the drainage horizontal main pipe 5 in the base-isolated building of FIG. 2. In this case, the joint pipe 6 is If the bending is not repeated frequently, it is only necessary to insert only the short pipe 10 around the joint pipe 6. However, in order to prevent an excessive shift between the short pipes 10 when a large bending occurs, The outer periphery of the short tube 10 was covered with a stretchable mesh bag of glass fiber as the conductive fiber material 11. When the joint pipe 6 is bent by an earthquake, as shown in FIG. 6, the short pipes 10 slide against each other at their abutting portions, so that they are not damaged and are susceptible to heat even after the earthquake has stopped. The working tube 6 can be covered with a short tube 10 to protect from fire. When a rubber knitted bag is made of a refractory fiber material 11 such as glass fiber and this bag is used in place of the mesh, it is possible to provide resilience such that the short tube 10 bent by an earthquake is returned straight. Reference numeral 15 is a fireproof cap made of mortar, and 16 is a connection pipe provided in the vertical pipe 1.

  In order not to generate a gap through which the heat of the fire circulates in the contact portion between the short tubes arranged in a curved manner, as shown in FIG. 7, a mortar in which one end face of the short tube 10 is inclined inward. It may be formed on the mold concave surface 13, and the other end surface may be formed on a convex inclined surface 14 such as a convex inclined surface or a saddle type inclined outward. In this case, since the contact surfaces of the short tubes 10 are arranged in an intricate manner, a gap is unlikely to occur in the contact portion between the short tubes even if the array is greatly curved, and the cylindrical arrangement is maintained, Since the heat of the fire from the outside hardly acts on the internal joint pipe 6, the fire resistance is improved.

  It is preferable that the abutment portion between the short tubes can slide smoothly, and therefore, a ring-shaped refractory material 27 having a smooth surface such as metal or ceramics is attached to the convex surface 14 as shown in FIG. May be formed. In this case, the short tube 10 is preferably formed by injection molding.

  If a space is provided between the adjacent short pipes 10, the joint pipe 6 can be bent relatively freely even after the refractory fiber material 11 is coated. In this case, as shown in FIGS. It is convenient to use the bendable fireproof two-layer pipe joint covering frame 17 as described above. In this covering frame 17, a plurality of short pipes 10 are connected to each other by a connecting member 18 having a movable direction and fire resistance, so that a unit unit 19 is produced, and the unit units 19 are further moved in different directions. In this way, the connection member 20 is used for connection. The connecting members 18 and 20 may be, for example, metal hinges having fire resistance and movable directionality, but in the illustrated example, the nonflammable tape 21 shown in FIG. 14 is used. This incombustible tape 21 has a movable directionality that is easy to bend in a direction perpendicular to the tape surface and difficult to bend in the direction along the surface, has good adhesion to the short tube 10, and has fire resistance, With this tape 21, two short tubes 10 arranged with a gap between each other were shifted by 180 degrees in the circumferential direction and connected at two locations to produce a unit unit 19. Then, as shown in FIGS. 9 and 10, the short pipes of the unit units 19 were further shifted by 90 degrees and connected by the connecting member 20 of the non-combustible tape to produce the covering frame 17. As shown by the arrows in FIG. 8, the covering frame 17 moves the short tubes 10 at both ends in the direction of 180 degrees, while the intermediate short tubes 10 can move in directions different from each other by 90 degrees. When the refractory fiber material 11 is wrapped around and covered and formed into a cylindrical shape, there is a space between the short tubes 10 so that it can be curved relatively freely. FIG. 11 shows the state of use. By fixing the short pipe at the end of the covering frame 17 to the discharge pipe 7, another short pipe 10 can be positioned around the joint pipe 6 in a fixed state. it can.

  The number of the short pipes 10 constituting the unit unit 19 can be set to three as shown in FIGS. 12 and 13, for example. In this case, the center axis 26 can be moved in the left and right directions more easily than the up and down directions. Although the degree of freedom of bending is more constrained than in the example of 8, the number of the connecting members 18 and 20 can be reduced, and the manufacturability of the covering frame 17 is improved.

  Although the example applied to the joint pipe 6 has been described in the above embodiment, an example applied to the long flexible pipe 28 is shown in FIG. In this case, the outer circumference of the bellows-like piping pipe 28 is covered with a plurality of short pipes 10, and the long pipe 10 can be bent by sliding the short pipe 10.

  A cylindrical connector 29 as shown in FIGS. 17 and 18 can be used as means for connecting the short tubes 10 to each other. The connector 29 is made of a synthetic resin material, a heat-expandable rubber material, or the like, and has end insertion ports 30 and 30 into which ends of the short tube 10 are inserted at both ends, and is thin and bulges at an intermediate portion. The flexible portion 32 is formed by forming a pleat 31, a rib or a mesh, and the flexible portion 32 is allowed to slide to allow the short tubes 10 to slide with each other, and vibration such as an earthquake acts. However, the short pipe 10 is not damaged, and the internal piping pipe 28 can be continuously protected from the heat of the fire. Reference numeral 33 denotes a stopper for restricting the end of the short pipe, and reference numeral 34 denotes a convex spacer. When this connector 29 is used, a plurality of short pipes 10 can be easily set on the outer periphery of the joint pipe 6 and the pipe 28, and the heat of the fire reaches the flexible part 32. The fire resistant fabric 22 can be wound as necessary so that there is no need.

  A fire resistance test was performed with the configuration shown in FIG. The short tube 10 had an outer diameter of 156 mm, a thickness of 7.0 mm, and a length of 20 mm. The joint pipe 6 is made of a thermoplastic elastomer. The temperature in the furnace was heated to 1049 ° C. and maintained for 2 hours, but there was no change in the joint pipe 6.

Side view showing the connection state of a conventional branch pipe joint pipe Side view showing the connection between the conventional vertical pipe and the horizontal drain main pipe The cut side view of the principal part of the Example of the bendable type fireproof two-layer pipe joint by this invention Illustration of the short pipe in FIG. The cut side view of the principal part of the Example which applied the bendable type fireproof two-layer pipe joint of this invention for the connection of a vertical pipe and a drainage horizontal main pipe FIG. 5 is a cut side view of the operating state. Explanatory drawing of a modification of short pipe Perspective view of the covering frame Sectional view taken along line 9-9 in FIG. Sectional view of FIG. Sectional view of the use state of the covering frame Cross-sectional view of a modification of the covering frame Explanatory drawing of the curved state of the covering frame of FIG. Illustration of non-flammable tape Explanatory drawing of other modified examples of short pipe Sectional view of an example applied to a long flexible pipe Connector illustration Sectional view taken along line 18-18 in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Longitudinal pipe, 2 branch pipes, 6 Joint pipe, 10 Short pipe, 11 Fire-resistant fiber material, 12 Bendable fire-resistant double-layer pipe joint, 13 Mortar-shaped concave surface, 14 Convex-shaped surface, 17 Bendable fire-resistant double layer Cover frame for pipe joint, 18 connecting member, 19 unit unit, 20 connecting member, 21 nonflammable tape, 27 refractory material, 28 pipe for piping, 29 connector, 30 end insertion port, 31 rib, 32 flexible part,

Claims (6)

A plurality of flexible pipes or joint pipes, a plurality of fiber-mixed mortar short pipes are inserted, and the outer circumference is covered with a refractory fiber material. Laminar pipe or refractory double-layer pipe joint. A plurality of short pipes made of fiber-mixed mortar are inserted into the outer circumference of a flexible pipe or joint pipe made of a synthetic resin straight pipe, bellows pipe or curved pipe, and the outer circumference is fireproof. A bendable fire-resistant double-layer pipe or fire-resistant double-layer pipe joint, characterized in that it is covered with a fire-resistant fabric impregnated with a mesh of fiber material or an adhesive . One end face of the fiber-mixed mortar short pipe is formed in a mortar-type inclined face inclined inward, and the other end face is formed in a convex inclined face inclined inward or a convex face such as a saddle type. The bendable fireproof double-layer pipe or fireproof double-layer pipe joint according to claim 1 or 2 . 4. The bendable refractory double-layer pipe or refractory according to claim 3 , wherein the convex surface of the other end face is formed by attaching a refractory material having a smooth surface such as metal or ceramics. Double layer pipe joint. A plurality of short pipes made of fiber-mixed mortar are arranged at intervals, and these short pipes are connected to each other by a connecting member having a movable direction to form a unit unit. A flexible frame for a fire-resistant double-layer pipe or a fire-resistant double-layer pipe joint having a curved structure that is connected so as to be movable in a direction different from the movable direction of each unit unit itself by a connecting member. A bendable type characterized in that it is inserted into the outer periphery of a pipe or pipe for piping having a joint, and the outer periphery of the bendable fireproof double-layer pipe or fireproof double-layer pipe joint covering frame is covered with a fireproof fiber material. Refractory double-layer pipe or refractory double-layer pipe joint. The plurality of short tubes inserted through each other are connected to each other by a cylindrical connector made of a heat-expandable rubber material or a synthetic resin material having a short tube end insertion opening at both ends and a flexible portion at an intermediate portion. The bendable fireproof double-layer pipe or fireproof double-layer pipe joint according to claim 1 .

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