JP5566951B2 - Branch structure of resin piping and method for forming the same - Google Patents

Description

  The present invention relates to a branched structure of resin piping used for fire extinguishing piping such as tunnels and factory piping, for example.

  Conventionally, for example, a fire hydrant for initial fire extinguishing is installed inside a tunnel against a fire inside the tunnel. FIG. 11 is a schematic view showing a conventional tunnel fire extinguishing piping structure 100, and FIG. 12 is a longitudinal sectional view. The tunnel fire-extinguishing pipe structure 100 includes a fire hydrant 113 and a water supply pipe 105 that connects the fire hydrants 113 and can supply water to each fire hydrant 113.

  Fire hydrants 113 are installed at predetermined intervals inside the tunnel. In addition, a water supply pipe 105 is laid under the tunnel. The fire hydrants 113 are connected by a water supply pipe 105 provided over the entire length of the tunnel from the outside of the tunnel. Fire extinguishing water flowing through the water supply pipe 105 is branched by the branch pipe body 109 in the vicinity of the fire hydrant 113 and supplied to each fire hydrant 113. A water supply section (not shown) is connected to the outside of the tunnel to the water supply pipe 105, and a predetermined amount of water can be supplied.

  The fire hydrant 113 is installed, for example, every 50 m in the tunnel. The fire hydrant 113 is connected to the water supply pipe 105 by a branch pipe body 109. The branch pipe body 109 is installed inside the concrete hand hole 107.

  Conventionally, metal pipes such as ductile cast iron pipes have been used as water pipes of fire extinguishing piping structures (for example, Patent Document 1 and Patent Document 2) used for such fire extinguishing. Such a metal tube has sufficient heat resistance against heat in a fire.

JP 2001-571 A JP 2008-55024 A

  However, such a water supply pipe is installed in the tunnel longitudinal direction while connecting a metal pipe having a predetermined length. However, the metal pipe is heavy, and the operation of installing the water supply pipe over the entire length of the long tunnel requires many man-hours for the connection, and costs and a work period.

  On the other hand, there is a method in which the water supply pipe is made of a resin that is light and long. By using the water supply piping made of resin, it is possible to greatly reduce the length of the connection points in the longitudinal direction, so that the connection work is reduced, and members such as joints can be reduced. Moreover, since it is lightweight, it is excellent in handleability, and even when a force is applied to the water supply pipe due to a ground change after installation, it can be absorbed by the deformability of the pipe itself within a certain range.

  However, since the resin water supply pipe does not have the heat resistance as that of the metal pipe, there is a risk that the water supply pipe may be broken by internal pressure due to a decrease in strength of the water supply pipe itself in a fire. For this reason, a reinforcing tape is spirally wound around the outer periphery of the resin water supply pipe to form a reinforcing layer for enhancing the internal pressure resistance.

  Such a reinforcing tape is easy to completely cover the entire circumference of a tubular body that is a straight pipe. However, because of the shape of the branch portion, it is difficult to completely wrap the reinforcing tape around the entire outer periphery of the branch pipe body by ordinary spiral winding.

  FIG. 13 is a view showing a state in which the reinforcing tape 119 is wound around the branch pipe body 109. As shown in the figure, the branch pipe body 109 includes a straight pipe portion 115 and a branch portion 117 formed substantially perpendicular to the straight pipe portion 115 at the substantially center thereof. The straight pipe portion 115 and the branch portion 117 are cylindrical members having substantially the same outer diameter. When the reinforcing tape 119 is wound around such a branch pipe body 109, the reinforcing tape 115 is not wound around a part of the joint portion between the straight pipe portion 115 and the branch portion 117 (X in the figure), and the internal pipe There is a possibility that the tube exposed portion 121 where the body is exposed is formed.

  That is, if the reinforcing tape 119 is wound around the branch pipe body 109 by a normal method, a gap may be formed in the reinforcing layer formed by the reinforcing tape 115. If such a gap is formed, the internal pressure resistance characteristics of the tube body exposed portion 121 are not sufficient, and for example, the resin tube may be softened during a fire and the tube body exposed portion 121 may be damaged.

  The present invention has been made in view of such problems, and has excellent workability and a branch structure of a resin pipe that can ensure internal pressure resistance even when used as a water supply pipe for extinguishing a tunnel fire. The purpose is to provide.

In order to achieve the above-mentioned object, the first invention is a resin pipe and a resin branch pipe connected to the resin pipe and having a branch portion joined to at least a part of the pipe portion at a predetermined angle. And a reinforcing layer provided on the outer periphery of the branch pipe, and the reinforcing layer is disposed along a shape corresponding to an outer surface shape in the vicinity of a joint portion between the pipe portion and the branch portion, A reinforcing member that covers the entire outer surface of the joint near the outer periphery, and a fiber reinforced tape that is wound around an outer peripheral surface other than the vicinity of the joint between the pipe and the branch , and is held. The reinforcing member that is not in a state is held by being fixed by a holding member provided on the outer periphery of the reinforcing member, and the reinforcing member can be wound around the entire circumference of the pipe portion of the branch pipe body. a plate-shaped member having a possible length, the branch A bulging portion corresponding to the outer surface shape of the joint portion between the branch portion and the tube portion is formed in advance at the opposing edge portion of the hole, and the branch portion is formed in the hole. The reinforcing member is inserted and wound around the outer periphery of the pipe part, the bulging part is in close contact with the outer surface of the lower end part of the branch part, and covers the entire circumference of the joint part between the pipe part and the branch part, The fiber reinforcing tape is wound so as to cover a part of the outer peripheral surface of the reinforcing member, the fiber reinforcing tape functions also as the holding member, and the reinforcing member is fixed by the fiber reinforcing tape, In the vicinity of the joint portion between the pipe portion and the branch portion, the fiber reinforcing tape is not wound, and if there is no reinforcing member, a tube exposed portion is formed through which the resin pipe inside is exposed, and the tube exposed By covering the part with the reinforcing member, It is a branch structure of a resin pipe, characterized in that all the outer peripheral surface of the serial branch tube is covered with the fiber-reinforced tape or the reinforcing member. According to the present invention, the number of branch portions is not limited to one, and may be a plurality of locations. One reinforcing member may be attached to the pipe body, or a plurality of reinforcing members may be attached.

  Here, the vicinity of the junction between the pipe part and the branch part is the outer surface shape of the branch pipe body in the region where the branch part is extended with respect to the pipe part in the front surface of the branch pipe, And the outer shape of the lower end of the tube part are three-dimensionally continuous.

  The reinforcing member is a pair of plate-like members, a notch corresponding to the branch portion is formed, and an outer surface shape of a joint portion between the branch portion and the tube portion is formed at an edge of the notch. A bulging portion is formed, a pair of the plate-like members are opposed to each other, the branch portion is sandwiched by the notches, the reinforcing member is wound around an outer periphery of the pipe portion, and the bulging portion is the branch portion You may closely_contact | adhere to the lower end part outer surface of.

The holding member may be a band-shaped member provided on the outer peripheral surface of the reinforcing member. A heat insulating layer may be provided on the outer periphery of the reinforcing layer, a waterproof layer may be provided on the outer periphery of the heat insulating layer, and the waterproof layer may be made of polyimide, fluororesin, or cross-linked polyethylene.

  Further, the fiber reinforcing tape may be provided by being wound directly in the vicinity of the joint portion between the pipe portion and the branch portion so as to be in contact with at least a part of the inner surface of the reinforcing member. In this case, a tape or a resin film may be attached with an adhesive to a portion where the fiber reinforcing tape cannot be wound on the inner surface of the reinforcing member.

  By adopting such a structure, in addition to the reinforcing effect of the reinforcing tape directly wound around the branch pipe body, the reinforcing tape wound so as to contact the inner surface of the branch pipe body with the reinforcing member can be tightened. The branch part of the body can be more firmly held by the reinforcing member. A plurality of the branch portions may be formed in the branch pipe body in parallel with each other at the same angle, and may be collectively arranged with respect to the plurality of branch portions by one reinforcing member.

  According to the first invention, since the reinforcing layer is provided on the outer periphery of the resin water supply pipe and the branch pipe body, for example, the strength reduction of the water supply pipe and the branch pipe body due to the heat of the fire inside the tunnel is reinforced by the reinforcement layer. Thus, it is possible to prevent the water supply pipe and the branch pipe body from being damaged.

  The branch pipe is formed by joining the pipe part and the branch part in a T-shape. In this case, it is difficult to wrap the fiber reinforced tape near the joint part between the pipe part and the branch part. It is. However, according to the present invention, since a reinforcing member having a shape corresponding to the outer shape of the part is separately used for a part where it has been difficult to wind the conventional fiber reinforced tape, the reinforcing layer is provided over the entire circumference of the branch pipe. Can be formed. For this reason, damage etc. of a branch pipe can be prevented. Although the branch portion of the branch pipe has a substantially vertical T shape, it does not necessarily have to be vertical, and may intersect with an oblique V shape. Further, the position of the branch portion does not necessarily need to be in the center, and can be set to a position deviated from the center to either side in the middle of the pipe portion. Further, although not particularly shown, if a plurality of branch portions formed in the pipe portion are formed in parallel with each other at the same angle, a single reinforcing member can be used to cover the plurality of branch portions and the vicinity of the joint portion over the entire circumference. Can be reinforced. That is, a plurality of holes and notches for inserting the branch portions may be formed, and one reinforcing member may be inserted into the plurality of branch portions at the same time.

  Moreover, a reinforcement member can be hold | maintained and fixed to the outer surface of a branch pipe body by winding a fiber reinforcement tape around the outer periphery of a reinforcement member. For this reason, in this case, a separate holding member for holding the reinforcing member is unnecessary. Further, the outer periphery of the reinforcing member can be separately fixed with a holding member in the form of a SUS band or a resin band having high heat resistance. In this way, by tightening and fixing the outer periphery of the reinforcing member with a band, the reinforcing member can be held and fixed without using the reinforcing tape.

  Further, if the reinforcing member is provided with a hole, and the reinforcing member is wound around the outer periphery of the branch pipe body by inserting the branch portion into the hole, the reinforcing member can be easily attached. Further, by forming in advance a shape corresponding to the outer surface shape in the vicinity of the joint portion between the pipe portion and the branch portion, the entire outer periphery in the vicinity of the joint portion between the pipe portion and the branch portion can be reliably covered with the reinforcing member. .

  In addition, by separating the reinforcing member into a pair of separating members and attaching the branching part so that the branching part is sandwiched by the notch part, the branching pipe body can be bent even if it is bent in an arc shape along the outer surface of the pipe part in advance. The reinforcing member can be easily attached.

  Furthermore, the reinforcing tape can be provided by being wound directly around the branch portion of the branch pipe so as to be in contact with the inner surface of the reinforcing member of the reinforcing member. In this way, after the reinforcing tape is directly wound around the branch pipe with the pipe exposed portion at the joint between the pipe and the branch, the reinforcing member is further disposed on the branch and is placed on the outer periphery of the reinforcing member. A fiber reinforcing tape may be wound and fixed, or the outer periphery of the reinforcing member may be separately fixed with a metal band holding member such as a SUS band.

  By adopting such a configuration, in addition to the reinforcing effect of the reinforcing tape wound directly around the branch pipe body, it is tightened with the fiber reinforcing tape or the holding member via the reinforcing member, so that the internal pressure resistance of the branch pipe body is reduced. Can be increased. In particular, when the reinforcing tape is wound directly on the branch pipe, the reinforcing member is provided on the outer periphery of the reinforcing tape wound directly on the pipe, so the holding member or the reinforcing tape securely holds the reinforcing member on the branch pipe. The reinforcing member can be fastened and held and fixed.

  By attaching a tape or a resin film with an adhesive to the tube exposed portion of the branch tube that cannot be wound with the tape, the entire branch portion of the branch tube can be tightened almost uniformly by the reinforcing member.

  In addition to the above, after tape is directly wound around the branch tube, the tape or resin film is cut into a shape that matches the tube exposed part of the branch tube that cannot be wrapped with tape, and then attached with an adhesive. After that, it is possible to place the tape on almost all the surfaces where the reinforcing member of the branch pipe is in contact with the reinforcing member of the branch pipe. Can affect.

  Moreover, the branch structure which provides two branch parts in a pipe part and reinforces with one or several reinforcement members can also be designed as needed. For example, in the case where the pipe part is provided perpendicularly or in the same direction at the same inclination angle, a reinforcing member having two bulging parts can be used for the branching structure provided with two branching parts. The necessary branch structure can be obtained, but when the branch portions are provided in different directions or at different angles, it is necessary to use a plurality of reinforcing members. That is, by doing in this way, even when a tubular body has a plurality of branch parts, it is possible to constitute a reinforcing structure by a reinforcing member.

A second invention is a method for forming a branch structure of a resin pipe, which is connected to the resin pipe, and is made of a resin branch formed by joining at least one branch portion at a predetermined angle to at least a part of the pipe portion. A hole is formed in a plate-like member having a length that can be wound around the entire circumference of the pipe portion of the branch pipe body with respect to the pipe body, and a bulging portion is formed at the opposite edge of the hole. The bulging portion is formed in advance so as to correspond to the outer surface shape of the joint portion between the branch portion and the pipe portion, and the branch portion is inserted into the hole of the reinforcing member. and, the bulging portion so as to be in close contact with the connecting portion near the outer surface of the branch portion, wound on the outer periphery of the tube portion in a state of not holding the reinforcing member, and the reinforcing member in the state not held, the said tube portion other than the vicinity junction between the branch portion and the tube portion and the partial The outer peripheral surface of the part, wound fiber reinforced tape, the fiber reinforced tape to function as a retaining member of said reinforcing member, in the vicinity junction between the branch portion and the tube portion is not wound around the fiber-reinforced tape, If the reinforcing member is not provided, a tubular body exposed portion where the resin pipe inside is exposed is formed, and the tubular body exposed portion is covered with the reinforcing member, so that the outer peripheral surface of the branch tubular body is covered with the fiber reinforced tape. Or it is the formation method of the branched structure of the resin piping characterized by covering with the said reinforcement member .

  According to the second invention, by using the holding member having a shape corresponding to the three-dimensional outer surface shape in the vicinity of the connection portion between the pipe portion and the branch portion, the internal pressure reinforcement of the branch pipe body can be easily and reliably performed. It can be performed.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in workability | operativity and can provide the branched structure etc. of the resin piping which can ensure an internal pressure-proof characteristic, even if it uses as a water supply piping etc. for tunnel fire extinguishing.

It is a figure which shows the branch structure 1, (a) is an elevation view, (b) is a top view. The perspective view which shows the reinforcement member 15. FIG. It is a figure which shows the reinforcement member 15, (a) is a top view, (b) is the sectional view on the AA line of (a). The figure which shows the process of attaching the reinforcement member 15 to the branch pipe body 3. FIG. It is a figure which shows the state in which the reinforcement member 15 was attached to the branch pipe body 3, (a) is a front view, (b) is DD sectional view taken on the line of (a), (c) is E of (a). -E sectional view taken on the line. (A) is a front view showing a state in which the reinforcing tape 11 is wound around the outer periphery of the reinforcing member 15, and (b) is a front view showing a state in which the reinforcing member 15 is attached to the outer periphery of the reinforcing tape 11. (A) is a front view which shows the state which wound the reinforcement tape 11 on the inner surface of the reinforcement member 15, (b) is a front view which shows the state which wound the reinforcement tape 11 on the inner and outer surface of the reinforcement member 15. (A) is a front view which shows the state which has arrange | positioned the reinforcement tape 11a in the exposed part of the branch pipe body 3, (b) is a front view which shows the state which attached the reinforcement member 15 to the outer periphery of the reinforcement tape 11. FIG. The perspective view which shows the reinforcement member 15a. The figure which shows the process of attaching the reinforcement member 15a to the branch pipe body 3. FIG. The perspective view which shows the tunnel fire extinguishing piping structure 100. FIG. Sectional drawing which shows the tunnel fire extinguishing piping structure 100. FIG. The front view which shows the state which wound the reinforcement tape 119 on the outer periphery of the branch pipe body 109. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A and 1B are diagrams showing a branch structure 1, in which FIG. 1A is a front view and FIG. 1B is a plan view. In addition, the branch structure 1 shown in FIG. 1 is a part in the tunnel fire extinguishing piping structure etc. which were shown in FIG. 9, FIG.

  In the water supply pipe 5, a reinforcing layer is mainly formed on the outer periphery of a resin tube, and a protective layer is provided on the outer periphery of the reinforcing layer. The tube is made of, for example, heat-resistant crosslinked polyethylene. The reinforcing layer is formed by, for example, winding a reinforcing belt-like body in a spiral shape. As the reinforcing band-like body, a fiber reinforcing tape such as polyarylate fiber can be used, and Vectran (registered trademark) manufactured by Kuraray Co., Ltd., which is a super fiber tape, can be used.

  Vectran (registered trademark) is flame retardant, has excellent creep resistance, has a high thermal decomposition temperature of 450 ° C or higher, and has a pressure resistance of fire extinguishing pipes even when the temperature of the branch section is 80 ° C in the event of a fire. Sufficient strength (eg, about 1200 MPa). The polyarylate fiber tape may be wound, for example, by wrapping ends in the tape width direction, or may be wound with a slight gap. Further, the reinforcing layer may be formed by winding a polyarylate fiber tape a plurality of times, for example, by wrapping the tape in the forward and reverse directions. The winding method of the polyarylate fiber tape is appropriately determined according to the strength of the polyarylate fiber tape and the required internal pressure resistance.

  The protective layer is made of resin, and for example, flame retardant polyolefin is used. The protective layer is used for preventing damage during laying work of the water supply pipe 5. Further, when the water supply pipe 5 is exposed, weather resistance is required for the water supply pipe 5. For this reason, it is desirable to mix 1% or more of carbon black in the protective layer.

  A plurality of water supply pipes are laid in the longitudinal direction by EF (Electro Fusion) connection, butt connection, connection by mechanical joint, or the like. In the tunnel fire extinguishing pipe, fire hydrants are connected at predetermined intervals as described above. A hand hole 7 is provided at a connection portion with the fire hydrant, and the branch pipe body 3 and the water supply pipe 5 are connected inside the hand hole 7.

  As shown in FIG.1 (b), the branch pipe 3 is a substantially T-shaped member. The pipe body constituting the branch pipe body 3 is made of resin like the water supply pipe 5, and the pipe section 9 and the branch section 10 formed substantially perpendicular to the pipe section 9 at the approximate center in the longitudinal direction of the pipe section. Consists of Both ends of the pipe portion 9 of the branch pipe body 3 are connected to the water supply pipe 5 passing through the side wall portion (side surface) of the hand hole 7 inside the hand hole 7.

  The branch pipe body 3 is made of, for example, polyethylene. A reinforcing layer is formed on the outer periphery of the branch pipe 3 in the same manner as the water supply pipe 5. The reinforcing layer formed on the branch pipe 3 is for improving the internal pressure resistance of the branch pipe. In addition, the reinforcement layer of the branch pipe body 3 can use the thing similar to the reinforcement layer of the water supply piping 5 mentioned above, for example, the reinforcement tape 11 of a polyarylate fiber is wound.

  In a front view of the branch pipe 3 (the branch pipe 3 in plan view of the branch structure 1 in FIG. 1B is a front view of the branch pipe 3), the branch portion 10 is extended with respect to the pipe portion 9. Thus, in the overlapping region, a region in which the outer shape of the branch portion 10 and the outer shape of the tube portion 9 are three-dimensionally continuous is formed. In this region, it is difficult to spirally wind the reinforcing tape 11 over the entire circumference without any gaps. That is, in the state where the reinforcing tape 11 is wound around the branch pipe body 3, as shown in FIG. 11, a portion where the reinforcing tape is not wound occurs. In the present invention, the reinforcing member 15 is provided on the lower layer side of the reinforcing tape 11 in this region. Details of the reinforcing member 15 will be described later.

  In addition, you may form a heat insulation layer in the outer periphery of a reinforcement layer. The heat insulating layer is for suppressing the temperature rise of the branch pipe body 3 when the temperature in the tunnel is transmitted into the hand hole 7. Furthermore, you may provide a waterproof layer in the outer periphery of a heat insulation layer as needed. The waterproof layer is for preventing external water from entering the heat insulating layer. As the waterproof layer, a heat-resistant polyimide, a tape made of a fluororesin, a heat-shrinkable tube of crosslinked polyethylene, or the like can be used.

  An end portion of the branch portion 10 of the branch pipe body 3 (a T-shaped branch portion, which is arranged in the direction of the tunnel wall surface) is connected to the steel pipe 13 by, for example, mutual flanges. The steel pipe 13 connected to the branch pipe body 3 inside the hand hole 7 is arranged in the direction of the tunnel wall surface in the hand hole 7 and bent upward along the tunnel wall surface to the outside of the hand hole 7 (inside the tunnel). Derived. Note that the tunnel wall surface (inner wall surface) is slightly depressed at the hand hole 7 installation portion, and a space in which the steel pipe 13 can be led out is formed between the tunnel wall surface and the hand hole 7. The steel pipe 13 is connected to a fire hydrant (not shown) above the hand hole 7.

  Further, a heat insulating material is provided between the inside of the tunnel and the inside of the hand hole 7 (gap or lid) as necessary. The heat insulating material prevents the heat from the tunnel from being transferred to the inside of the handhole 7 through the boundary portion between the inside of the tunnel and the inside of the handhole. As the heat insulating material, fiber heat insulating materials such as ceramic fiber, rock wool, and glass wool, foam heat insulating materials such as cross-linked foamed polyethylene and urethane foam, and inorganic heat insulating materials such as calcium silicate can be used.

  Next, the reinforcing member 15 will be described. 2 is a perspective view showing the reinforcing member 15, FIG. 3A is a plan view of the reinforcing member 15, and FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A. The reinforcing member 15 is a plate-like member. Note that the material of the reinforcing member 15 is not particularly limited as long as it is excellent in heat resistance and maintains the internal pressure resistance of the branch pipe body 3 even in a high temperature environment. For example, the reinforcing member 15 is made of a metal or a fiber similar to a reinforcing tape.

  The reinforcing member 15 has a length that can be wound over the entire circumference of the pipe portion 9 of the branch pipe body 3 (the lateral direction in FIG. 3A is the longitudinal direction). A hole 17 is formed in the approximate center of the reinforcing member 15. The hole 17 can be inserted into the branch portion 10 of the branch tube 3, and is shaped according to the outer diameter of the branch portion 10 in a state where the reinforcing member 15 is rolled and wound around the outer periphery of the branch tube 3 (tube portion 9). It becomes.

  A bulging portion 19 is formed at each edge portion facing the longitudinal direction of the hole 17. The bulging portion 19 is a portion that swells in one surface direction of the reinforcing member 15. In addition, the hole 17 and the bulging part 19 are collectively formed, for example with a press.

  The shape of the bulging part 19 is a shape according to the outer surface shape of the branch pipe body 3 in the vicinity of the joint part between the pipe part 9 and the branch part 10. That is, in a state where the reinforcing member 15 is rolled up and wound around the outer periphery of the branch tube 3 (tube portion 9), the outer surface shape in the vicinity of the joint portion between the tube portion 9 and the branch portion 10 (in the front surface of the branch tube 3) The shape of the outer surface of the branch tube 3 in the overlapping region by extending the branch portion 10 with respect to the portion 9 is a shape in which the outer shape of the branch portion 10 and the outer shape of the lower end portion of the tube portion 9 are three-dimensionally continuous) And substantially the same shape.

  FIG. 4 is a diagram illustrating a process of attaching the reinforcing member 15 to the branch pipe body 3. As shown in FIG. 4A, the branch portion 10 is inserted through the hole 17 of the reinforcing member 15 in the state where the bulging portion 19 of the reinforcing member 15 is on the upper surface side (in the direction of arrow B in the figure). At this time, the branch portion 10 is inserted into the hole 17 while bending the vicinity of the hole 17 of the reinforcing member 15 so as to correspond to the outer surface of the tube portion 9 of the branch tube 3. After the reinforcing member 15 is inserted to the base of the branching portion 10, the longitudinal direction of the reinforcing member 15 is wound around the outer surface of the tube portion 9 (in the direction of arrow C in the figure).

  5A and 5B are diagrams showing a state in which the reinforcing member 15 is attached to the branch pipe body 3. FIG. 5A is a front view, and FIG. 5B is a cross-sectional view taken along the line D-D in FIG. FIG.5 (c) is the EE sectional view taken on the line of Fig.5 (a). A wrap portion may be formed between the ends of the reinforcing member 15.

  As shown in FIG. 5, the bulging portion 19 is a lower end portion of the branch portion 10 and has substantially the same shape as the outer surface shape in the vicinity of the joint portion between the tube portion 9 and the branch portion 10. For this reason, the inner surface of the bulging portion 19 is in close contact with the outer peripheral surface of the lower end portion of the branching portion 10, and the portion can be completely covered with the reinforcing member 15. Further, a portion other than the bulging portion 19 is in close contact with the outer peripheral surface of the tube portion 9, and the portion can be completely covered with the reinforcing member 15. Therefore, the reinforcing member 15 can cover the entire outer periphery in the vicinity of the connection portion between the branch portion 10 and the tube portion 9.

  From this state, as shown in FIG. 6A, the reinforcing tape 11 is spirally wound around the outer peripheral surface of the branch tube 3 (reinforcing member 15). At this time, as described above, a portion where it is difficult to wind the reinforcing tape 11 occurs in the vicinity of the joint portion between the branch portion 10 and the tube portion 9 of the branch pipe body 3, and the reinforcing member 15 is provided in this portion. It is done. Therefore, at least one of the reinforcing tape 11 or the reinforcing member 15 is provided on the outer peripheral surface of the branch pipe 3, and the resin portion of the branch pipe 3 is not exposed to the outer surface.

  Further, the reinforcing member 15 wound around the outer peripheral surface of the tube portion 9 can be held by the reinforcing tape 11. Therefore, the reinforcing member 15 does not fall off, and a gap is not generated between the inner surface of the reinforcing member 15 and the outer surface of the branch pipe 3.

  Note that, as shown in FIG. 6B, the reinforcing member 15 may be formed on the outer peripheral surface of the reinforcing tape 11. In this case, first, the reinforcing tape 11 is wound around the outer peripheral surface of the branch tube 3, and the reinforcing member 15 is provided so as to cover the tube exposed portion formed in the vicinity of the connecting portion between the branch portion 10 and the tube portion 9. Good. At this time, the reinforcing tape 11 is wound around the outer periphery of the branch pipe 3 so that the reinforcing tape 11 does not protrude from the inner surface side of the reinforcing member 15, and the reinforcing member 15 is disposed at a portion where the reinforcing tape 11 cannot be wound. .

  However, in this case, since the reinforcing member 15 is not held by the reinforcing tape 11, it is necessary to separately hold the reinforcing member 15 by a holding member such as the band 21 in a state where the reinforcing member 15 is provided on the branch pipe 3. . The band 21 is a metal band such as stainless steel. That is, a holding member is provided on the outer peripheral surface of the reinforcing member 15, and the reinforcing member 15 may be held by the holding member so that the reinforcing member 15 does not fall off from the branch tube 3 or a gap is generated. Further, the reinforcing member 15 may be held with an adhesive or the like instead of the holding member.

  Further, as shown in FIG. 7A, the reinforcing member 15 may be disposed on the outer peripheral surface of the reinforcing tape 11 so that the reinforcing tape 11 protrudes from the inner surface side of the reinforcing member 15. That is, the reinforcing tape 11 may be directly wound around the joint portion between the tube portion 9 and the branch portion 10 so as to be in contact with at least a part of the inner surface of the reinforcing member 15.

  Further, as shown in FIG. 7B, the reinforcing member 15 may be disposed on the outer peripheral surface of the reinforcing tape 11, and the reinforcing tape 11 may be wound around the outer peripheral surface of the reinforcing member 15. In this case, the reinforcing member 15 is held by the reinforcing tape 11. That is, the reinforcing tape 11 functions as a holding member. Therefore, a holding member such as the band 21 is unnecessary.

  Further, as shown in FIG. 8, a reinforcing tape 11a may be used. As shown in FIG. 8 (a), the reinforcing tape 11a is in the vicinity of the joint between the pipe portion 9 and the branch portion 11 when the reinforcing tape 11 is wound around the outer peripheral surface of the branch tube 3, and the reinforcing tape 11 is not wound and is cut in accordance with the shape of the portion where the inner branch tube 3 is exposed on the outer surface. Thereafter, the reinforcing tape 11 a is attached to the exposed portion of the branch pipe 3.

  From this state, as shown in FIG. 8B, the reinforcing member 15 is disposed on the outer peripheral surface of the reinforcing tape 11a and the reinforcing tape 11, and is fixed by the band 21 or the like. By doing in this way, on the inner surface of the reinforcing member 15, the reinforcing tape 11 does not generate a gap between the inner surface of the reinforcing member 15 and the branch pipe body 3, and the portion can be reliably reinforced. Note that other tape members or films may be used instead of the reinforcing tape 11a. In this case, it is desirable that the thickness of the tape or film member is substantially the same as the thickness of the reinforcing tape 11.

  In addition, a tunnel fire extinguishing piping structure is constructed as follows, for example. First, a groove is formed of concrete, for example, as an installation part of the water supply pipe 5 on the side of the tunnel. A hand hole is formed for each predetermined distance of the installation part of the water supply pipe 5. The hand hole 7 is installed, for example, at an installation interval of installed fire hydrants. For example, the hand hole 7 is installed every 50 m. The hand hole 7 is made of concrete. The handhole 7 is surrounded by side walls on three sides, and is installed so that the opening side surface abuts against the inner wall surface side of the tunnel.

  Next, the water supply pipe 5 is installed in the tunnel longitudinal direction. In this case, for example, if the water supply pipe 5 has an inner diameter of 100 mmφ, a long pipe of about 150 m can be used. Therefore, the water supply pipe 5 may be installed in the longitudinal direction of the tunnel and cut at the handhole installation part. By doing in this way, since it is not necessary to connect water supply piping, the installation construction of the water supply piping 5 is easy, and a construction cost can be reduced.

  A branch tube 3 is installed inside the hand hole 7. The branch pipe body 3 is connected to the water supply pipe 5 described above. A reinforcing layer is formed by the reinforcing member 15 and the reinforcing tape 11 on the branch pipe body 3 inside the hand hole 7. After the water supply pipe 5 and the branch pipe body 3 are connected, the water supply pipe 5 is buried with river sand or the like. Moreover, the branch part 10 and the steel pipe 13 are connected. A fire hydrant is installed above the hand hole 7 and connected to the steel pipe 13. A lid made of concrete or the like is provided above the buried portion of the water supply pipe 5, and a lid made of iron or the like is provided above the handhole 7. As described above, the tunnel fire extinguishing piping structure is constructed.

  As described above, according to the branch structure 1 according to the first embodiment, the reinforcing layer is easily formed on the outer periphery of the branch pipe 3 by the reinforcing tape 11 and the reinforcing member 15. can do.

  Further, a reinforcing member 15 is used in a portion where it is difficult to wind the reinforcing tape 11. For this reason, a reinforcing layer is formed on either the reinforcing member 15 or the reinforcing tape 11 on the entire outer periphery of the branch pipe 3. For this reason, the internal pressure resistance characteristic of the branch pipe body 3 can be reliably ensured.

  In particular, since the bulging portion 19 corresponding to the outer surface shape of the branch pipe body 3 is formed in the reinforcing member 15 in advance, the reinforcing member 15 can be reliably brought into close contact with the outer surface of the branch pipe body 3.

  Next, a second embodiment will be described. FIG. 9 is a perspective view showing a reinforcing member 15a used in the second embodiment. In the following description, components having the same functions as those of the branch structure 1 according to the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 8 and the like, and redundant descriptions are omitted.

  The reinforcing member 15 a has substantially the same configuration as the reinforcing member 15, but differs in that it is separated into a pair of separating members 16. The reinforcing member 15a is separated in a direction substantially perpendicular to the direction in which the bulging portion 19 is formed. That is, the hole 17 in the reinforcing member 15 becomes a notch 23 formed at the end of each separating member 16 in the separating member 16. By making the pair of separated separating members 16 face each other and butting the notches 23 with each other, the same shape as the hole 17 is obtained.

  Although FIG. 9 shows an example in which the separation member 16 is a pair of flat plate members, the present invention is not limited to this. For example, the separation member 16 that is a plate-like member may be formed in advance in an arc shape corresponding to the outer surface of the pipe portion.

  FIG. 10 is a diagram showing a process of attaching the reinforcing member 15a to the branch pipe 3, and is a view seen from the pipe axis direction side of the pipe part 9. FIG. In the example shown in FIG. 10A, the pair of separation members 16 are formed in an arc shape corresponding to the outer surface shape of the tube portion 9. The separation member 16 is attached to the branch pipe body 3 so as to sandwich the branch portion 9 at each notch 23 (in the direction of arrow F in the figure).

  As shown in FIG. 10 (b), when the separation member 16 is completely attached to the branch pipe 3, the bulging portion 19 of the reinforcing member 15 a (separation member 16) is joined to the branch portion 10 and the pipe portion 9. Since it substantially matches the outer surface shape in the vicinity of the portion, the outer surface of the lower end of the branch portion 10 can be covered, and the outer peripheral surface of the tube portion 9 in the vicinity of the joint portion between the branch portion 10 and the tube portion 9 can be covered. . A wrap portion may be formed between the lower ends of the separating member 16.

  In this state, if the reinforcing tape 11 is wound around the outer periphery, a structure substantially similar to the branch structure 1 can be obtained. When the reinforcing member 15a is disposed after the reinforcing tape 11 is wound around the outer periphery of the branch pipe 3, the reinforcing member 15a is branched by a holding member (such as a metal band) or an adhesive (not shown). What is necessary is just to hold | maintain on the outer peripheral surface of the pipe body 3 (reinforcement tape 11).

  According to the second embodiment, the same effect as when the reinforcing member 15 is used can be obtained. In addition, the reinforcing member 15a can be easily attached to the branch pipe 3 even if it is formed in an arc shape corresponding to the outer shape of the pipe portion 9 in advance.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  Further, the branch structure of the present invention can be used for other than fire extinguishing pipes for tunnels. For example, the present invention can be applied to fire extinguishing pipes for general structures, factory pipes, water and sewage pipes, agricultural water pipes, and the like.

1 ......... Branch structure 3 ......... Branch tube 5 ......... Water supply pipe 7 ......... Hand hole 9 ......... Pipe part 10 ......... Branch part 11, 11a ......... Reinforcing tape 13 ......... Steel pipes 15, 15a ......... reinforcing member 16 ......... separating member 17 ......... hole 19 ......... bulged portion 21 ......... band-shaped holding member 22 ......... tunnel wall 23 ......... notch 100 ... ... Fire extinguishing piping structure 103 ......... Tunnel 105 ......... Water pipe 107 ......... Hand hole 109 ......... Branch 113 ......... Fire hydrant

Claims (9)

Resin piping,
A resin-made branch pipe connected to the resin pipe and having a branch part joined to at least a part of the pipe part at a predetermined angle;
A reinforcing layer provided on the outer periphery of the branch pipe body,
The reinforcing layer is disposed along a shape corresponding to an outer surface shape in the vicinity of the joint portion between the pipe portion and the branch portion, and a reinforcing member that covers the outer surface around the outer surface in the vicinity of the joint portion and is not held . A fiber reinforced tape wound around an outer peripheral surface other than the vicinity of the joint portion between the pipe portion and the branch portion ;
The reinforcing member that is not held is held by being fixed by a holding member provided on the outer periphery of the reinforcing member,
The reinforcing member is a plate-like member having a length that can be wound around the entire circumference of the pipe portion of the branch pipe body , and a hole through which the branch portion can be inserted is formed. A bulging portion corresponding to an outer surface shape of a joint portion between the branch portion and the tube portion is formed in advance on the edge portion, and the branch portion is inserted into the hole so that the reinforcing member is disposed on the outer periphery of the tube portion. Wound, the bulging portion is in close contact with the outer surface of the lower end portion of the branch portion, covering the entire circumference of the joint portion of the tube portion and the branch portion,
The fiber reinforcing tape is wound so as to cover a part of the outer peripheral surface of the reinforcing member, the fiber reinforcing tape functions also as the holding member, and the reinforcing member is fixed by the fiber reinforcing tape,
In the vicinity of the joint portion between the pipe portion and the branch portion, the fiber reinforcing tape is not wound, and if there is no reinforcing member, a tube exposed portion is formed through which the resin pipe inside is exposed, and the tube exposed The resin pipe branching structure is characterized in that the entire outer peripheral surface of the branch pipe is covered with the fiber reinforcing tape or the reinforcing member because the portion is covered with the reinforcing member .   The reinforcing member is a pair of plate-like members, a notch corresponding to the branch portion is formed, and an outer surface shape of a joint portion between the branch portion and the tube portion is formed at an edge of the notch. A bulging portion is formed, a pair of the plate-like members are opposed to each other, the branch portion is sandwiched by the notches, the reinforcing member is wound around an outer periphery of the pipe portion, and the bulging portion is the branch portion The resin pipe branch structure according to claim 1, wherein the resin pipe is closely attached to an outer surface of a lower end portion of the resin pipe.   The branch structure for a resin pipe according to any one of claims 1 to 2, wherein the holding member is a band-shaped member provided on an outer peripheral surface of the reinforcing member. Resin piping,
A resin-made branch pipe connected to the resin pipe and having a branch part joined to at least a part of the pipe part at a predetermined angle;
A reinforcing layer provided on the outer periphery of the branch pipe body,
The reinforcing layer is disposed along a shape corresponding to the outer surface shape in the vicinity of the joint portion between the pipe portion and the branch portion, and covers the entire outer periphery of the joint portion in the vicinity of the joint portion, and the branch pipe body And a fiber reinforced tape wound around the outer peripheral surface of
The reinforcing member is fixed by a holding member provided on an outer periphery of the reinforcing member,
The reinforcing member is a plate-like member, and a hole through which the branch portion can be inserted is formed. A bulge corresponding to an outer surface shape of a joint portion between the branch portion and the pipe portion is formed at an opposing edge portion of the hole. A protruding portion is formed in advance, the branch portion is inserted into the hole, the reinforcing member is wound around the outer periphery of the tube portion, the bulging portion is in close contact with the outer surface of the lower end portion of the branch portion,
The fiber reinforcing tape is wound so as to cover a part of the outer peripheral surface of the reinforcing member, the fiber reinforcing tape functions as the holding member, and the reinforcing member is fixed by the fiber reinforcing tape,
Further, the branch structure of the resin pipe, wherein the fiber reinforcing tape is provided by being wound directly in the vicinity of the joint portion between the pipe portion and the branch portion so as to be in contact with at least a part of the inner surface of the reinforcing member .   The branch structure of the resin pipe according to claim 4, wherein a tape or a resin film is attached to a portion where the fiber reinforcing tape cannot be wound on the inner surface of the reinforcing member with an adhesive.   2. The branch pipe according to claim 1, wherein a plurality of the branch portions are formed in parallel with each other at the same angle, and one reinforcing member is collectively disposed with respect to the plurality of branch portions. The branch structure of the resin piping according to any one of claims 1 to 5. Providing a heat insulating layer on the outer periphery of the reinforcing layer, providing a waterproof layer on the outer periphery of the heat insulating layer;
The said waterproof layer is comprised with a polyimide, a fluororesin, or crosslinked polyethylene, The branched structure of the resin piping in any one of Claims 1-6 characterized by the above-mentioned. The branched structure of the resin pipe according to any one of claims 1 to 7, wherein the reinforcing member is configured by a single surface except for the bulging portion. A method for forming a branch structure of a resin pipe,
For resin-made branch pipes that are connected to resin pipes and that are formed by joining at least one branch part at a predetermined angle to at least a part of the pipe part,
A reinforcing member in which a hole is formed in a plate-like member having a length that can be wound around the entire circumference of the pipe portion of the branch pipe body, and a bulging portion is formed at an opposite edge portion of the hole. Use
The bulging part is formed in advance with a bulging part corresponding to the outer surface shape of the joint part between the branch part and the pipe part,
Inserting the branch into the hole of the reinforcing member;
The bulging portion so as to be in close contact with the connecting portion near the outer surface of the branch portion, wound on the outer periphery of the tube portion in a state of not holding the reinforcing member,
A fiber reinforcing tape is wound around the reinforcing member in a state where it is not held, and the outer peripheral surface of the pipe part and the branch part other than the vicinity of the joint part between the pipe part and the branch part, and the fiber reinforcement tape is reinforced A tube-exposed portion that functions as a holding member for the member and does not wind the fiber reinforced tape near the joint portion between the tube portion and the branch portion, and without the reinforcement member, exposes the resin pipe inside. A method for forming a branch structure of a resin pipe , wherein the pipe body exposed portion is covered with the reinforcing member so that the entire outer peripheral surface of the branch pipe body is covered with the fiber reinforcing tape or the reinforcing member. .

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