JP2005282847A - Device for controlling slide of inner and outer tube of fire-proof straight double tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To interpose a low-priced projecting elastic body for automatically controlling slide of an inner and an outer tubes in a clearance between the inner and the outer tubes of a fire-proof straight double tube. <P>SOLUTION: The fire-proof straight double tube 1 is formed by covering the inner tube 2 made of a synthetic resin such as hard vinyl chloride with the outer tube 3 made of fiber-mixed mortar, and interposing the projecting elastic body 5 in the clearance 4 between the inner tube and the outer tube, while compressing with wall surfaces of the inner and the outer tubes, to control relative slide of the inner and the outer tubes to each other. The projecting elastic body 5 is formed by coating a peripheral surface area of the inner tube to be covered with the outer tube with hot-melt adhesive 6 at a height more than an interval of the clearance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for controlling sliding of inner and outer pipes constituting a straight pipe type fireproof double-layer pipe.

  Conventionally, in order to prevent the spread of fire due to a fire, a fireproof double-layer pipe having a configuration in which a pipe made of synthetic resin such as hard vinyl chloride is covered with a pipe made of mortar mixed with fiber is used for a drain pipe of a high-rise house. Various types of fireproof double-layer pipes, such as straight pipes and joints, have been manufactured, but straight pipes (fireproof double-layer straight pipes) are made of hardened pipes (outer pipes) made of fiber-mixed mortar. However, it is manufactured through a process of extrapolating it into a hard vinyl chloride pipe (inner pipe) cut to a predetermined length. The outer pipe is formed shorter than the inner pipe, and the inner pipe is set with the insertion allowance for pipe connection protruding from both ends of the outer pipe.

In order to prevent the outer tube from being damaged due to the thermal expansion of the inner tube and to allow the inner tube and the outer tube to slide during piping work, it is usually 0 A gap of about 5 to 1 mm is formed. However, if there is this gap, the inner pipe will move during transportation of the fireproof double-layer straight pipe and the outer pipe will be damaged, or after construction the inner pipe will vibrate due to drainage and cause noise. As shown in Japanese Patent Application Laid-Open No. 2003-166673, the applicant interposes an annular elastic body such as a rubber band in a state of being crushed, and the expansion elasticity of the inner tube and the outer It was proposed to control the relative slide of the tube.
JP 2003-166673 A

  When an appropriate sliding force is applied to the inner and outer pipes, the ring-shaped elastic body interposed in the gap deforms or rolls inside the gap, so that it is not necessary to remove the elastic body from the gap during piping construction work. Since the positional relationship can be adjusted by sliding the pipe, and the expansion force of the annular elastic body acts to widen the gap, for example, when laying a fireproof two-layer straight pipe vertically, the relative weight of the inner and outer pipes by their own weight Sliding is prevented, and there is an advantage that the inconvenience that the inner pipe falls out during the piping work can be solved. However, the work of attaching the annular elastic body is performed manually, which is a bottleneck in the automation of the manufacturing process. The reason for this is that there are many types of refractory double-layer straight pipes in length and diameter, and a device that automatically fits an annular elastic body around the inner pipe of various dimensions can be manufactured but becomes very expensive. This increases the manufacturing cost.

  In order to reduce the cost, it is desirable to easily and inexpensively place an elastic body in the gap between the inner and outer pipes. In order to satisfy these demands, the present invention is inexpensive and automatic in the gap between the inner and outer pipes of the refractory double-layer straight pipe. In particular, it is an object to interpose a protruding elastic body for sliding control of the inner and outer tubes.

  In the present invention, in order to solve the above-mentioned problems, an inner tube made of synthetic resin such as hard vinyl chloride is covered with an outer tube made of fiber-mixed mortar, and compressed between the inner tube and the outer tube by the wall surfaces of these inner and outer tubes. In a fireproof two-layer straight pipe in which the relative sliding of the inner and outer pipes is controlled by interposing a projected elastic body, a hot melt adhesive is applied to the area of the outer peripheral surface of the inner pipe covered with the outer pipe. It formed by apply | coating to the height more than the space | interval of this clearance gap. The outer tube is extrapolated after the protrusion elastic body of the hot melt adhesive formed in the region of the outer peripheral surface is cured. The protrusion elastic body is formed by applying a spiral shape in the circumferential direction, a linear shape extending in the tube axis direction of the inner tube, a ring shape, or a branched branch shape in which a branch portion is added to the ring shape. The elastic body may be applied and formed at a plurality of locations at intervals in the length direction of the inner tube.

  The present invention forms a protruding elastic body interposed in the gap between the inner and outer pipes by applying a hot melt adhesive to the region of the outer peripheral surface of the inner pipe covered with the outer pipe of the fireproof two-layer straight pipe. Since the hot melt adhesive hardens on the outer peripheral surface in a relatively short time, the outer tube can be immediately attached to the inner tube, and the inner tube can be rotated and applied in front of the nozzle of a commercially available hot melt adhesive application device. Therefore, it is easy to automate and the apparatus can be manufactured at low cost. By changing the nozzle shape, the application amount and the application shape can be easily changed, so that it is possible to cope with various dimensions of the gap between the inner and outer pipes. In addition, by applying and forming the protrusion elastic body at a plurality of locations at intervals in the length direction of the inner tube, the outer tube contacts the inner tube via the protrusion elastic body, and the vibration of the inner tube The sound insulation of the fireproof double-layer straight pipe is improved.

  The embodiment of the present invention will be described with reference to the attached drawings. In FIGS. 1 and 2, reference numeral 1 denotes an inner tube 2 made of synthetic resin such as hard vinyl chloride covered with an outer tube 3 made of fiber-mixed mortar. A gap 4 is provided between the inner tube 2 and the outer tube 3 to prevent damage to the outer tube 3 due to thermal expansion of the inner tube 2 or vibration generated during drainage flow. . A protruding elastic body 5 for controlling the relative sliding of the inner and outer tubes 2 and 3 is interposed in the gap 4. The protruding elastic body 5 is interposed in a compressed state by the tube walls of the inner and outer tubes 2 and 3 and suppresses free sliding of the inner and outer tubes 2 and 3 by its elasticity.

  For this configuration, it is necessary to go through a manufacturing process in which the protruding elastic body 5 is attached to the inner tube 2 and then inserted into the outer tube 3, and as described above, an apparatus for attaching the protruding elastic body 5 is expensive. However, in the present invention, the protrusion is obtained by applying the molten hot melt adhesive 6 to the outer peripheral surface area of the inner tube 2 covered with the outer tube 3. The elastic body 5 is formed, and the hot melt adhesive 6 is cured relatively quickly on the outer peripheral surface thereof, and then the inner tube 2 is inserted into the outer tube 3 to produce the fire-resistant double-layer straight tube 1.

  More specifically, the inner pipe 2 is placed on a rotating device 8 having a roller 7 as shown in FIGS. 3 and 4 in the middle of the production line of the fire-resistant double-layer straight pipe to which the inner pipe 2 is conveyed. The inner tube 2 covered with the outer tube 3 is covered with the synthetic resin rubber adhesive 6 in a hot melt state from the nozzle 9 of the hot melt adhesive application device prepared above. Apply to the area of the outer peripheral surface. The hot melt adhesive 6 is prepared to have a viscosity so that it can be applied in a chevron-like state, and even after the curing, the height larger than the gap 4 is maintained to form the protruding elastic body 5. The diameter of the nozzle 9 is adjusted. Then, after the hardening, when the outer tube 3 made of fiber-mixed mortar separately manufactured in the inner tube 2 is inserted as shown in FIG. 5, the fireproof two-layer straight tube 1 is completed.

  Various adhesives can be used as the hot-melt adhesive 6, and it is preferable to use a quick-drying adhesive that cures in about several tens of seconds, such as styrene-ethylene-butylene-styrene copolymer resin. 3 to 5, the nozzle 9 is moved and the hot melt adhesive 6 is spirally applied to the intermediate portion in the length direction of the outer peripheral surface of the inner tube 2 to form the protruding elastic body 5. However, the application shape is arbitrary, and it may be applied in such a shape that the protruding elastic body 5 does not fall off from the gap 4 when the inner and outer tubes 2 and 3 are slid. For example, as shown in FIG. 6, it may be applied to the outer peripheral surface of the inner tube 2 in the form of a plurality of lines extending in the tube axis direction. The ring shape as shown in FIG. 7 or the branched shape as shown in FIG. You may form in. When the protruding elastic body 5 is formed in a spiral shape as shown in FIG. 5, the outer tube 3 can be smoothly inserted into the inner tube 2 without receiving the resistance of the protruding elastic body 5, and it is preferable that the protruding elastic body accompanies the insertion. 5 can be prevented from shifting.

  If necessary, it is also possible to apply and form the protruding elastic bodies 5 at a plurality of locations at intervals in the length direction of the outer peripheral surface of the inner tube 2. In this case, the outer tube 3 is interposed between the protruding elastic bodies 5. Therefore, even if the inner pipe 2 vibrates due to the flow of the drainage, the protruding elastic body 5 acts as a buffer and the transmission of the vibration to the outer pipe 3 is alleviated, so that the fire-resistant two with good sound insulation. A straight layer pipe is obtained. In addition, the sound insulation can be improved by using a large inner diameter of the outer tube 3 and increasing the gap 4 to, for example, about 3 mm. However, if the application amount of the hot melt adhesive 6 is increased, the outer gap 3 can be adapted to the large gap 4. The protruding elastic body 5 can be easily formed and is convenient.

  The inner tube 2 made of hard vinyl chloride having an outer diameter of 114 mm, a thickness of 6.6 mm, and a length of 2100 mm is manufactured separately from the inner tube 2 made of fiber-mixed mortar having an outer diameter of 129 mm, a thickness of 6.5 mm, and a length of 2000 mm. When manufacturing the fireproof two-layer straight pipe 1 inserted into the outer pipe 3 and having a gap 4 of 1 mm between the inner and outer pipes, it is a ring shape that goes around the outer peripheral surface of the inner pipe 2 and has a height of 1.3 mm when cured. The protruding elastic body 5 was formed with a vinyl chloride quick-drying hot melt adhesive 6. And after hardening of the adhesive agent 6, the inner pipe 2 was inserted and inserted into the outer pipe 3, and the fireproof two-layer straight pipe 1 was manufactured. When I did it, the inner and outer tubes did not shift.

Cutaway side view showing an embodiment of the present invention Sectional drawing of the 2-2 line part of FIG. Explanatory drawing of a state in which a protruding elastic body is formed on the inner tube Side view of FIG. Explanatory drawing of the state of inserting the inner tube into the outer tube Explanatory drawing of a state in which hot-melt adhesive is applied linearly Illustration of hot melt adhesive applied in a ring shape Explanatory drawing of a state in which hot melt adhesive is applied in a branched manner

Explanation of symbols

1 fireproof double layer straight pipe, 2 inner pipe, 3 outer pipe, 4 gap, 5 protrusion elastic body, 6 hot melt adhesive,

Claims (3)

  Cover the inner tube made of synthetic resin such as hard vinyl chloride with an outer tube made of fiber-mixed mortar, and insert a protruding elastic body compressed by the wall surface of the inner and outer tubes in the gap between the inner tube and the outer tube. In the fire-resistant double-layer straight pipe in which the relative sliding of the inner pipe is controlled, the hot elastic adhesive is applied to the region of the outer peripheral surface of the inner pipe covered with the outer pipe at a height higher than the gap interval. An inner / outer pipe slide control device for a fire-resistant double-layer straight pipe, characterized by being formed by:   2. The inner and outer pipe slide control of a fireproof double-layer straight pipe according to claim 1, wherein the outer pipe is extrapolated after hardening of the protruding elastic body of the hot melt adhesive formed in a region of the outer peripheral surface of the inner pipe. apparatus.   The protrusion elastic body is applied to the outer peripheral surface of the inner tube in a spiral shape in the circumferential direction, a linear shape extending in the tube axis direction of the inner tube, a ring shape, or a branched branch shape in which a branch portion is added in a ring shape. The inner and outer pipe slide control device for a refractory double-layer straight pipe according to claim 1 or 2, wherein

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