JP2019092377A - Conduit pipe, conduit pipe connection structure, bell block, method for connecting conduit pipes, method for connecting conduit pipe and bell block, pipe joint, and ring member - Google Patents

Abstract

To provide a conduit pipe and the like, excellent in assembly workability and easy to connect.SOLUTION: A region sandwiched by a pair of locking walls 9 is a ring member-positioning section 11. A ring member 5 is positioned in the ring member-positioning section 11. The ring member 5 substantially forms a C shape in which one section thereof in the circumferential direction is open at an open section 19. One end-section side of the ring member 5 is a reduced-diameter section 21 having a smaller outer diameter than do other sections. A plurality of claw parts 23 are provided which are oriented toward the other end-section side of the ring member 5. The claw parts 23 are provided on the reduced-diameter section 21 at a distance from one another in the circumferential direction with slits 25 interposed therebetween. The claw parts 23 increase in diameter such that the outer diameter thereof gradually increases in a direction from the reduced-diameter section 21 toward the tip.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a conduit for protecting an electric wire, a connection structure of conduits, a bell block, a method of connecting conduits, a method of connecting a conduit and a bell block, a tube joint, and a ring member.

  Conventionally, for example, a conduit is buried in the ground and used. In this case, a plurality of electrical conduits are juxtaposed and buried. Further, since each of the conduits is manufactured and transported with a predetermined length, a plurality of conduits are connected at a connection portion by a pipe joint, a fitting structure, or the like.

  As such a connection structure of a conduit, for example, a pipe joint having a helical tube has been proposed (Patent Document 1).

  In Patent Document 1, the connection is performed by rotating and screwing the end (male structure) of the outer surface spiral electric wire tube to the inner surface spiral shape (female structure) of the pipe joint. Furthermore, a water expansion member is provided on the outer periphery of the male joint and the inner peripheral surface of the female joint to stop water.

  Further, there has been proposed a retaining ring which can be compactly and easily join together corrugated flexible tubes, and does not easily fall off from the pipe joint even in the case of an impact or the like (Patent Document 2).

  In Patent Document 2, a retaining ring is disposed in a female fitting portion used for connection of a conduit as a protective tube such as a cable. The male fitting portion inserted into the female fitting portion can be prevented from coming off from the female fitting portion by the retaining ring. At this time, by making the shape of the retaining ring proper, the mounting of the retaining ring is easy.

  More specifically, the retaining ring of the invention of Patent Document 2 is provided on a ring-shaped main body, a plurality of claws bent inward in the radial direction of the main body, and the outer peripheral surface of the main body, And a plurality of stoppers protruding to the outer peripheral side of

  Here, the stoppers of the retaining ring include a first pair of stoppers and a second pair of stoppers, and the first pair of stoppers are provided at opposing positions of the main body, and the second pair of stoppers are provided. The stoppers are provided at opposite positions of the main body. Further, among the stoppers, an inclined portion which is inclined in the tube axis direction of the main body portion is provided on the outer surface of at least the second pair of stoppers. The inclination angles of the inclined portions provided on the second pair of stoppers are formed so as to be opposite to each other with respect to the tube axis direction of the main body portion.

  According to the invention of Patent Document 2, when attaching the retaining ring to the female pipe joint of the conduit, the retaining ring falls down inside the pipe, and it takes time to attach to the inner wall of the conduit itself, etc. It can solve the problem. In addition, due to the impact when unloading from a truck or the like, it is possible to prevent the C-shaped retaining ring from being temporarily reduced in diameter and the retaining ring falling off the pipe joint.

  In addition to this, a socket and a slot are formed at both ends in the tube axial direction, and a ring is attached to a rubber ring and a first predetermined position on the back side of the rubber ring, and the slot is inserted into the socket. A possible corrugated synthetic resin tube has been proposed (US Pat. No. 5,677,015).

  In Patent Document 3, a groove for receiving the ring and cooperating with the ring to prevent removal is formed at a second predetermined position of the socket on the tip end side of the rubber ring. Patent Document 3 relates to a corrugated synthetic resin pipe and a connection structure using the corrugated synthetic resin pipe. Further, in the invention of Patent Document 3, a ring mounted on a corrugated synthetic resin pipe in which peak portions and valley portions are alternately formed on the outer peripheral surface is two ring members in which a part in the circumferential direction is cut. Are formed to be superimposed in the tube axis direction. When the outlet is inserted into the socket, both of the two ring members are contracted. On the other hand, since the corrugated synthetic resin tube abuts on one of the ring members when pulling out the difference port, even if the diameter of one of the ring members is reduced, the other ring member remains open. For this reason, withdrawal of the corrugated synthetic resin tube is restricted.

  Moreover, it is proposed that the block body for protecting the conduit used for a handhole is provided with the retaining structure of a conduit (patent document 4).

  In Patent Document 4, the block body has a substantially cubic or substantially rectangular parallelepiped outer shape, and a through hole is formed. In the through holes, a substantially circular cross-sectional shape is continuous in a concavo-convex shape in the tube axis direction from the surface side to the back side of the block. A retaining member having a locking piece is attached to the recess of the through hole.

Unexamined-Japanese-Patent No. 2007-64267 JP, 2009-275790, A JP, 2002-98268, A JP, 2011-234520, A

  However, patent document 1 is used for connection of a spiral-shaped waved pipe, and there is a restriction in the shape of an applicable pipe body. Moreover, since it is necessary to screw in a pipe joint at the time of connection, it takes time for connection work. Further, since the outer diameter of the pipe joint becomes larger than the outer diameter of the pipe body, for example, when a plurality of conduits are stacked and arranged in the ground, the joint portion becomes unstable.

  Moreover, although patent document 2 is related with the retaining ring inserted in the inside of a female fitting structure, when assembling, the workability which inserts a retaining ring in the inside of a female fitting part is bad. In addition, since it is not possible to visually recognize the state after assembly, it may not be noticed that the retaining ring is not attached or dropped out during transportation.

  Moreover, patent document 3 has a rubber ring in the position near the insertion port side of a male part, and also has a retaining ring in the back side of a male part. Although the diameter expansion ring is dropped into the groove of the waved portion periodically provided in the male portion, in Patent Document 3, the rubber ring is provided at a position close to the insertion port side of the male portion. For this reason, when inserting the male joint part deeply into the female joint part and fitting it with the retaining ring, the insertion resistance of the rubber ring part becomes large, so in some cases, a lubricant is added to the rubber ring part. Need to be applied

  Further, in Patent Document 4, since a part of the locking piece is embedded in the block main body, the manufacturability is poor and, similarly to Patent Document 2, the locking piece can not be viewed from the outside.

  The present invention has been made in view of such problems, and is excellent in assembling workability and easy to connect, a conduit, a connection structure of conduits, a bell block, a method of connecting conduits, a conduit and a bell An object of the present invention is to provide a method of connecting blocks, a pipe joint, and a ring member used for these.

  In order to achieve the above-described object, a first invention is a conduit having a male fitting portion formed on an outer peripheral portion in the vicinity of an end portion of the tube, wherein the male fitting portion is in the tube axial direction And a ring member disposed in a region between the lock walls, wherein the ring member is substantially open with a part in the circumferential direction. The ring member is C-shaped, and a plurality of ring members are provided separately from each other via slits in the circumferential direction with respect to the reduced diameter portion on one end side of the ring member and the reduced diameter portion. The diameter of the claws is gradually increased as the diameter of the claws increases from the diameter-reduced portion to the tip, and the tip of the claw of the ring member is the diameter of the claws. It is located on the base side of the tubular body, and the reduced diameter portion is disposed on the distal end side of the tubular body, in the region sandwiched by the locking walls, A large diameter portion is formed on the tip end side of the tubular body, and a small diameter portion is formed on the base side of the tubular body in a region sandwiched by the locking walls, and between the large diameter portion and the small diameter portion And the length of the small diameter portion and the slope portion is shorter than the sum of the lengths of the large diameter portion, the slope portion and the small diameter portion. The ring member has a clearance between at least one of the locking walls and a region in which the ring member is sandwiched by the locking walls. In the above, the electric conduit is characterized by being axially slidable.

  A locking rib may be formed on the back surface of each of the claws at the center in the circumferential direction of each of the claws.

  The electric pipe may be provided with a water blocking member further on the base side than the locking wall on the base side of the male fitting portion. In the present invention, as described later, the opening side of the tubular body is the tip side of the tubular body, and the back side in the longitudinal direction of the tubular body which is the opposite side is defined as the proximal side of the tubular body.

  According to the first aspect of the present invention, it is possible to easily visually recognize the ring member in which the ring member is disposed on the outer surface of the male fitting portion. In addition, when inserting the male fitting portion into the female fitting portion, the diameter of the ring member is increased by the expansion of the circumferential length of the ring member due to the elastic repulsive force of the ring member, and the bending deformation of the claw in the tube axial direction cross section The ring member can be efficiently deformed by the effect of both of the diameter expansion by recovery. For this reason, the insertability of a male fitting part is favorable.

  In particular, when fitting the male fitting portion to the female fitting portion, the ring member can move on the large diameter portion of the two-stage structure of the male fitting portion. Further, when the male fitting portion is pushed into the female fitting portion, finally, the end of the female fitting portion abuts on the claw portion of the ring member. Therefore, the male fitting portion is restrained by the ring member in the female fitting portion, and the male fitting portion effectively acts on the connection of the conduit.

  Thus, according to the first aspect of the present invention, the male fitting portion is locked by the ring fitting portion formed in the female fitting portion, and the claw portion of the ring member exceeds the ring fitting portion. It takes a moment to lock. Also, in order to facilitate diameter reduction and diameter expansion of the ring member, the large diameter side in the axial direction of the ring member is disposed on the back side of the conduit, and the elastic repulsive force of the large diameter portion of the ring member expands The diameter can be made easy. Further, even if the thickness of the end of the large diameter portion to which the drawing force is applied is increased, the diameter can be easily reduced because the opening is provided in a part of the ring member in the circumferential direction.

  A second invention is a conduit having a fitting structure at both ends, which is a tube, a male fitting portion formed at one end of the tube, and the other end of the tube. And a female fitting portion having a shape capable of fitting to the male fitting portion, and the male fitting portion is formed on an outer peripheral portion in the vicinity of an end portion of the tube body. A pair of locking walls spaced apart in the axial direction of the tube, and a ring member positioned in a region between the locking walls, the ring member being a part in the circumferential direction And the ring member is spaced apart from each other in the circumferential direction with respect to the diameter-reduced portion on one end side of the ring member and the diameter-reduced portion via slits. A plurality of juxtaposed claws, the claws being gradually enlarged so that the outer diameter gradually increases from the reduced diameter portion toward the tip, and the ring member The tip of the claw portion is located on the base side of the tube, and the reduced diameter portion is located on the tip side of the tube, and the tube in a region sandwiched by the locking wall A large diameter portion is formed on the distal end side of the body, and a small diameter portion is formed on the base side of the tube in a region sandwiched by the locking walls, and a slope is provided between the large diameter portion and the small diameter portion. A portion is formed, and a length in a tube axis direction of the ring member is shorter than a sum of lengths of the large diameter portion, the slope portion and the small diameter portion, and a length of the small diameter portion and the slope portion The ring member has a clearance between at least one of the locking walls and a region in which the ring member is sandwiched by the locking walls. In which the female fitting portion is formed on the inner peripheral portion of the tube, and from the tip end, the tube is movable. Parts and a slope portion gradually reduced in diameter from the cylindrical portion, a conduit, characterized by comprising a ring engaging portion which is enlarged from the minimum inner diameter portion of the slope portion.

  A water blocking member may be provided on the base side of the locking wall on the base side of the male fitting portion.

  Between the male fitting portion and the female fitting portion, a helical waveform having a predetermined pitch may be formed continuous with the outer peripheral surface of the tube.

  Between the male fitting portion and the female fitting portion, a large diameter portion as a substantially square peak portion and a small diameter portion as a circular valley portion are alternately formed on the outer peripheral surface of the tube. May be

  A pair of protrusions are formed at a substantially central portion of the small diameter portion as the valley with respect to the tube axis direction of the tube, and a flat portion is formed between the protrusions in the tube axial cross section of the tube. May be

  The small diameter portion as the valley portion may be formed in a corrugated shape in a cross section in the tube axial direction of the tube body.

  The ring member has a tapered portion that decreases in diameter from the tip end of the claw portion toward the reduced diameter portion in a tube axial direction cross section, and the cross section of the claw portion is from the tip end of the claw portion to the reduced diameter portion It may be in the shape of a wedge having an acute angle in which the thickness decreases toward the end.

  The shape of the inner peripheral portion of the ring member may be a wedge shape in which the diameter gradually and continuously decreases from the claw portion, or it may be formed in a two-step acute wedge shape formed by bending the inner peripheral portion. May be As described above, the inner peripheral portion of the ring member may be bent in two steps as described above, and the inner peripheral portion of the ring member has a wedge shape which is gradually and continuously reduced in diameter from the claw portion. It may be.

  A locking rib may be formed on the back surface of each of the claws in the circumferential direction of each of the claws in the direction of the tube axis.

  In addition, by giving sufficient strength not to buckle when pulling force is applied to the ring member, a portion of the ring member having a thickness slightly thinner on the way from the tip of the claw portion to the reduced diameter portion is formed as the shape of the ring member. It is also possible to have a wedge shape formed.

  Further, a curved convex portion may be formed at a predetermined position on the inner peripheral portion of the reduced diameter portion so as to protrude from the inner peripheral portion.

  The ring member may be any of ABS resin, PP resin, hard vinyl chloride, or a mixed resin or polymer alloy of any of these and PC resin.

  The water blocking member may be disposed in a water blocking member accommodating portion formed on the base side further than the locking wall on the base side of the male fitting portion.

  The water blocking member may be either a rubber or a water expansion member.

  According to the second invention, the same effect as that of the first invention can be obtained. Further, since the female fitting portion is provided at the other end, it is easy to connect a plurality of conduits.

  Moreover, the electric wire tube concerning 2nd invention can also form a helical wave shape in the outer peripheral surface of a pipe body. That is, a male fitting portion and a female fitting portion can be provided to a conventional helical wave tube.

  In the electric wire tube according to the second aspect of the present invention, a substantially square peak portion and a circular valley portion may be alternately formed on the outer peripheral surface of the tube. That is, the conduit may be a square conduit. By so doing, when stacking a plurality of conduits, conduits can be stacked stably.

  Under the present circumstances, if a pair of projection part is formed in the approximate center part of the valley part to the tube axial direction of a tube body, and a groove shape is formed between the projection parts, electric conduit will be cut easily at the concerned site. be able to. For this reason, length adjustment is easy.

  The valleys between the substantially square peaks and the peaks may be used as the waveform. By doing this, the flexibility can be further enhanced.

  The ring member can form a convex portion at a predetermined position on the inner peripheral portion of the reduced diameter portion. In this case, when reducing the diameter of the ring member, the convex portion and the sloped portion in the male fitting portion are engaged, and the ring member is rotated in the tube axial direction with the engaging portion as a fulcrum. It can be elastically deformed to reduce its diameter.

  Here, if a convex portion is not formed at a predetermined position on the inner peripheral portion of the ring member, is the ring member shaped like an acute-angled wedge whose thickness decreases from the tip end of the claw portion toward the reduced diameter portion? Alternatively, the inner peripheral portion of the ring member is bent to form a wedge shape formed in two steps. That is, the ring member has a wedge shape having a reduced diameter portion which decreases in diameter from the tip end of the claw portion toward the reduced diameter portion. Even in this case, when reducing the diameter of the ring member, the ring member is elastically deformed by being rotated so as to fall in the tube axial direction with the contact portion between the inner peripheral side of the reduced diameter portion of the ring member and the large diameter portion as a fulcrum It can be made to diameter.

  In addition, by appropriately selecting the material and the shape of the ring member, it is possible to achieve both an appropriate elastic force and a strength that can withstand the pullout force.

  In addition, as the water blocking member, either a rubber or a water expansion member can be selected.

  A third aspect of the invention is a connection structure of a conduit according to the second aspect, comprising a plurality of the conduits, the male fitting portion of one of the conduits, and the other of the conduits. It is a connection structure of the electrical conduit characterized by being fitted and connected with the above-mentioned female fitting part.

  A third aspect of the present invention is the connection structure for a conduit according to the second aspect, comprising the handhole having a bell block, the conduit and the same configuration as the female fitting portion. It is a connection structure of a conduit, wherein a bell block and the male fitting part of the conduit are connected.

  The handhole may include a plurality of the bell blocks, and the conduit may be connected to part or all of the bell blocks.

  According to the third aspect of the present invention, it is possible to obtain a connection structure between conduits or a conduit and a bell block, which can be easily connected.

  A fourth invention is a bell block connectable to the conduit according to the second invention, and having the same structure as the female fitting portion.

  According to the fourth invention, it is possible to obtain a bell block which can be easily connected to a conduit.

  A fifth invention is a method of connecting electric conduits according to the second invention, wherein the step of inserting the end of the male fitting portion into the female fitting portion; The tapered portion of the outer periphery of the ring member disposed in the region sandwiched by the locking wall is brought into contact with the sloped portion to contact the ring member with the sloped portion of the male fitting portion. The claw portion of the ring member is slid to the end side of the large diameter portion to contact the inner peripheral side of the reduced diameter portion of the ring member with the large diameter portion of the male fitting portion And a step of elastically deforming and reducing the diameter by rotating the claw portion of the ring member so as to fall in the direction of the tube axis with the fulcrum as a fulcrum, and the end of the claw portion is the slope of the female fitting portion The ring fitting formed on the base side of the slope portion of the female fitting portion by passing through the portion It is a connection method of conduit each other, characterized in that a step of being stored in order.

  A fifth invention is a method of connecting electric conduits according to the second invention, wherein the step of inserting the end of the male fitting portion into the female fitting portion, and the female fitting portion The tapered portion formed on the inner peripheral surface of the ring member by bringing the tapered portion of the outer periphery of the ring member disposed in the region between the locking walls into contact with the inclined surface portion of Is slid to the inclined surface of the male fitting portion, and the convex portion of the inner periphery of the ring member is engaged with the inclined surface of the male engaging portion, with the engaging portion as a fulcrum A step of elastically deforming and reducing the diameter by rotating the claw portion of the ring member so as to fall in the tube axis direction, and storing a part of the claw portion in the small diameter portion of the male fitting portion; And an end portion of the claw portion passes through the inclined surface portion of the female fitting portion, whereby the claw portion is formed of the female fitting portion. Is a method of connecting conduit between, characterized in that a step of being accommodated in the ring fitting portion formed on the base side of the serial slope portion in order.

  In this case, since the diameter is reduced while sliding the ring member, the diameter can be reduced little by little depending on the sliding position, as compared with the case where the diameter is fixed by fixing the ring material. There is an effect that the resistance at the time can be reduced.

  A sixth aspect of the present invention is the connection method between the conduit and the bell block according to the second aspect, wherein the bell block has the same structure as the female fitting portion of the conduit. Inserting the tip end of the male fitting portion into the bell block, the tapered portion of the outer periphery of the ring member disposed in the region sandwiched by the locking wall in the slope portion of the bell block The ring member is brought into contact to slide to the end portion side of the large diameter portion in the vicinity of the inclined surface portion of the male fitting portion, and the claw portion of the ring member A step of elastically deforming and reducing the diameter by rotating so as to fall in the direction of the tube axis with the contact portion between the fitting portion and the large diameter portion as a fulcrum, and the end of the claw portion is the slope of the bell block Passing through the part, the claw part is in front of the bell block A conduit and a method of connecting a bell block, characterized in that a step of being accommodated in the ring fitting portion formed on the base side of the slope portion in order.

  A sixth aspect of the present invention is the connection method between the conduit and the bell block according to the second aspect, wherein the bell block has the same structure as the female fitting portion of the conduit, The step of inserting the end of the male fitting portion into the bell block, and the tapered portion of the outer periphery of the ring member disposed in the region sandwiched by the locking wall is brought into contact with the inclined surface of the bell block And sliding the projection formed at a predetermined position on the inner circumferential surface of the ring member to the sloped portion of the male fitting portion, and the ring on the sloped portion of the male fitting portion The convex portion of the member is engaged, and the claw portion of the ring member is rotated so as to fall down in the direction of the tube axis with the engagement portion as a fulcrum, thereby elastically deforming and reducing the diameter of the claw portion. Storing the portion in the small diameter portion of the male fitting portion, and an end portion of the claw portion Electric wire characterized in that, by passing through the inclined surface of the bell block, the claws are sequentially stored in the ring fitting portion formed on the base side of the inclined surface of the bell block. It is a connection method of a pipe and a bell block.

  According to the fifth and sixth inventions, the conduits or the conduits and the bell block can be easily connected.

  A seventh invention is a pipe joint connectable to the conduit according to the second invention, characterized in that at least one end has the same structure as the male fitting portion.

  In this case, both ends may have the same structure as the male fitting portion. Further, one end may have the same structure as the male fitting portion, and the other end may be a bellmouth. Further, one end may be a female fitting portion and the other end may be a male fitting portion.

  A seventh invention is a pipe joint characterized in that it is connectable to the conduit according to the second invention, and at least one end has the same structure as that of the female fitting portion.

  In this case, one end may have the same structure as the female fitting portion, and the other end may be a bellmouth. Also, one end may have the same structure as the female fitting portion, and the other end may have a spiral wave shape continuous with the outer surface of the tube.

  According to the seventh invention, it is possible to obtain a pipe joint which can be connected to a male fitting portion or a female fitting portion of a conduit.

  An eighth invention is a ring member used for a connection portion of a conduit, wherein the ring member has a substantially C shape in which a part in a circumferential direction is opened, and one end side of the ring member And a plurality of claws spaced apart from each other in the circumferential direction via slits with respect to the diameter-reduced portion, and the claw portion is formed from the diameter-reduced portion to the tip end. The diameter of the ring member gradually increases in diameter in the axial direction of the ring member, and the tapered portion decreases in diameter from the tip end of the claw portion toward the reduced diameter portion; The cross section of the claw portion is a ring member characterized in that it has an acute-angled wedge shape whose thickness decreases from the tip end of the claw portion toward the reduced diameter portion.

  A curved convex portion protruding from the inner circumferential portion may be formed at a predetermined position of the inner circumferential portion of the reduced diameter portion.

  A locking rib formed in the axial direction may be formed at the center of the circumferential direction of each of the claws on the back surface of the claw.

  According to the eighth aspect of the present invention, when used in the male fitting portion, the male fitting portion can be easily fitted with the female fitting portion and can be easily connected.

  According to the present invention, a conduit, a connection structure of conduits, a bell block, a method of connecting conduits, a method of connecting conduits and a bell block, a pipe joint, and these are excellent in assembling workability and easy to connect. The ring member used in the present invention can be provided.

The disassembled perspective view of the male fitting part 1a. The assembly perspective view of the male fitting part 1a. Sectional drawing of the male fitting part 1a. The partial expanded sectional view of the ring member 5. FIG. The figure which shows the connection method of the male fitting part 1a and the female fitting part 30a. (A), (b) is a figure which shows the connection method of the male fitting part 1a and the female fitting part 30a. (A), (b) is the H section enlarged view of FIG.6 (b), Comprising: The figure which shows the connection method of the male fitting part 1a and the female fitting part 30a. (A) is a figure which shows the connection method of the male fitting part 1a and the female fitting part 30a, (b) is a figure which shows the connection structure 10 of the male fitting part 1a and the female fitting part 30a . (A) is a partial expanded sectional view of ring member 5a which has a bending part. (B) is a partial expanded sectional view of ring member 5a without a bent part. It is a figure corresponding to FIG. 7, Comprising: The figure which shows the other connection method of the male fitting part 1a and the female fitting part 30a. (A) is a figure which shows the connection method of the male fitting part 1a and the female fitting part 30a, (b) is other connection structure 10 of the male fitting part 1a and the female fitting part 30a. Figure showing. (A), (b) is a perspective view of the ring member 5b. The figure which shows the conduit 40a. (A) is a figure which shows the conduit 40b, (b) is an expanded sectional view of N part of (a). (A) is the LL sectional view taken on the line of FIG. 13 (a), (b) is the MM sectional view taken on the line of (a). The figure which shows the conduit 40b. FIG. FIG. The figure which shows the connection structure 10a of the handhole 55 and the electric conduit 40a. The figure which shows bell block 50a. (A) is a figure which shows the pipe joint 60a, (b) is a figure which shows the pipe joint 60b. (A) is a figure which shows the pipe fitting 60c, (b) is a figure which shows the pipe fitting 60d.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the male fitting portion 1a, and FIG. 2 is an assembled perspective view of the male fitting portion 1a. FIG. 3 is a cross-sectional view of the male fitting portion 1 a in the tube axis direction. The male fitting portion 1a mainly includes the tube 3, the ring member 5, the water blocking member 7, and the like. The male fitting portion 1 a is formed on the outer peripheral portion in the vicinity of the end portion of the tube 3.

  The pipe 3 is, for example, a flexible electric pipe, a pipe joint main body, a bell block or the like, and the details of the form will be described later, but the form is not limited as long as an electric wire etc. can be inserted inside. Moreover, although the material of the pipe body 3 is not limited, for example, it is preferably made of resin and preferably made of high density polyethylene.

  High-density polyethylene is a polyethylene belonging to a crystalline thermoplastic resin in which ethylene of repeating units has linear bonding with little branching, and is also called hard polyethylene because of its relatively hard nature. In the old JIS K 6748: 1995, high density polyethylene is defined as polyethylene having a density of 0.942 or more. Copolymers of high density polyethylene are usually crystalline resins with 1 to 5 branches per 1000 ethylene monomers. The crystallinity of the homopolymer having a specific gravity of 0.97 exceeds 75%, the rigidity is high, the tensile strength, the impact strength, the cold resistance are excellent, and the mechanical properties do not decrease until the low temperature of -80 ° C. In addition, since there is little polarization in the molecule, it has poor adhesion and printability, but it has excellent insulating properties.

  The locking wall 9, the ring member placement portion 11, the locking wall 9, and the water blocking member housing portion 27 are formed at the end of the tube 3 sequentially from the tip. In the following description, the opening side (the direction of arrow B in the figure) of the tube 3 is defined as the tip side of the tube 3 and the opposite side (the direction of the arrow A in the figure) is the base side of the tube 3 Specify. The locking wall 9 is a portion where the outer diameter is larger than the surrounding. The pair of locking walls 9 are disposed apart from each other in the tube axis direction, and restrict the operating range of the ring member 5 described later.

  A region sandwiched by the pair of locking walls 9 is a ring member arrangement portion 11 in which a ring member 5 described later is disposed. That is, the male fitting portion 1 a includes a pair of locking walls 9 which are spaced apart in the tube axis direction, and the ring member 5 which is disposed in a region sandwiched by the locking walls 9. The ring member placement portion 11 is composed of a large diameter portion 13, a slope portion 15 and a small diameter portion 17 in order from the tip end side of the tube 3. That is, the large diameter portion 13 is formed on the tip end side of the tube 3 in the region sandwiched by the pair of locking walls 9, and on the base side of the tube 3 in the region sandwiched by the pair of locking walls 9 The small diameter portion 17 is formed, and the sloped portion 15 is formed between the large diameter portion 13 and the small diameter portion 17. The outer diameter of the large diameter portion 13 is smaller than the locking wall 9 and larger than the small diameter portion 17.

  A water blocking member accommodating portion 27 is provided on the base side of the ring member arranging portion 11. As shown in FIG. 3, the water blocking member housing portion 27 is a groove having a substantially rectangular cross section, and the water blocking member 7 is housed in the water blocking member housing portion 27. That is, the water blocking member 7 is provided further on the base side than the locking wall 9 on the base side of the male fitting portion 1 a. The water blocking member 7 is an annular member, the inner diameter of the water blocking member 7 is smaller than the outer diameter of the water blocking member housing portion 27, and the inner surface of the water blocking member 7 is the outer surface of the water blocking member housing portion 27. In close contact.

  The water blocking member 7 has a shape in which the inner peripheral portion of the cross-sectional shape is linear (approximately the same diameter in the tube axis direction), and the outer peripheral portion has a slope portion extending from one end to the other in the tube axial direction . In addition, as shown in FIG. 3, the largest outer diameter part of the water blocking member 7 is arrange | positioned toward the base side of the tube 3, and the outer diameter of the said part is the tube 3 in the male fitting part 1a. The water blocking member 7 protrudes radially outward, which is larger than the maximum outer diameter. Note that the maximum outer diameter portion of the sloped portion from one end in the tube axis direction toward the other may be formed not on the most proximal side of the water blocking member but in the middle between the tip side and the most proximal side.

  The water blocking member 7 is made of, for example, a rubber or a water expansion member. When the water blocking member 7 is made of rubber, for example, ethylene propylene rubber (Ethylene Propylene Rubber) can be applied. Ethylene propylene rubber is a type of synthetic rubber obtained by copolymerization of ethylene and propylene. In order to enable vulcanization with sulfur compounds, ethylene propylene rubber is often used as an EPDM rubber copolymerized with a small amount of a diene monomer. Other than these, SBR, CR, NBR, ACM rubber, EPDM / PP dynamically cross-linked elastomer, etc. can also be used.

  When the water blocking member 7 is made of a water expansion member, for example, a non-woven fabric made of polyester fiber and sodium polyacrylate fiber can be used. In this case, when the proportion of polyester fiber and sodium polyacrylate is 100% by mass in total, the amount of sodium polyacrylate is from 30% to 70%, preferably from 50 to 70% by mass. .

  Here, for the water-swellable nonwoven fabric, it is desirable to use a binder resin, which is a low melting point resin, in a range of 1 to 10% with respect to the total of both polyester fibers and sodium polyacrylate fibers. Desirably, it is 1 to 5%. For example, as the binder resin, a low melting point polyester can be used, and the formation of the non-woven fabric can be performed by a needle punch method.

  The ring member 5 is arranged in the ring member arrangement portion 11. The ring member 5 has a substantially C shape in which a part in the circumferential direction is opened at the opening 19. One end side of the ring member 5 is a reduced diameter portion 21 whose outer diameter is smaller than that of the other portion. A plurality of claws 23 are provided toward the other end of the ring member 5. The plurality of claws 23 are provided separately from the reduced diameter portion 21 in the circumferential direction via the slits 25. Further, the diameter of the claw portion 23 is gradually increased such that the outer diameter gradually increases as it goes from the reduced diameter portion 21 to the tip.

  FIG. 4 is a view showing details of the cross-sectional shape of the ring member 5. As described above, the outer surface of the ring member 5 gradually increases in diameter from the reduced diameter portion 21 toward the end of the claw portion 23. That is, the ring member 5 has a tapered portion 33 whose diameter decreases from the tip end of the claw portion 23 toward the reduced diameter portion 21 in the cross section in the tube axial direction. The ring member 5 has an acute wedge shape whose thickness decreases from the tip of the claw toward the reduced diameter portion 21 or a wedge shape whose thickness of the tip of the claw is thicker than that of the diameter reduced portion. At a predetermined position of the inner peripheral portion of the reduced diameter portion 21, a curved convex portion 31 protruding from the inner peripheral portion is formed.

  As shown in FIG. 3, in the ring member 5 used for connection of the electric pipe, the tip end of the claw portion 23 is positioned on the base side of the tube 3 and the reduced diameter portion 21 faces the tip end of the tube 3 Will be placed. Since the inner diameter of the ring member 5 is smaller than the outer diameter of the locking wall 9, the ring member 5 is held between the locking walls 9.

  For the ring member 5, for example, any of ABS resin, PP resin, hard vinyl chloride, or a mixed resin or polymer alloy of any of these and PC resin is applicable, and an ABS resin (acrylonitrile butadiene styrene copolymer) is applied It is desirable to do.

  ABS resin is a thermoplastic resin having a common temperature of 70 to 100 ° C., and is a resin excellent in the balance of mechanical properties such as rigidity, hardness, processability, impact resistance, and bending fatigue. By adjusting the compounding ratio of the raw materials, it is possible to balance the above-mentioned characteristics, and also excellent in printing characteristics, having good flowability, good moldability such as thin-walled products, and excellent in surface aesthetics. It is. The mechanical properties of the ABS resin are, for example, about 39 MPa in tensile strength and about 64 MPa in flexural modulus.

  For example, a graft method is known as a method for producing an ABS resin. In the emulsion graft method, acrylonitrile, latex, styrene, and a catalyst and an emulsifier are polymerized in a polymerization reactor, water and the like are removed by a centrifugal separator, and then pelletized by an extruder. In the bulk polymerization method, each is polymerized using a polymerization reaction tank, and the unpolymerized monomer is recovered and then pelletized in an extruder. In the polymer blending method, rubber and additives are added to an AS resin, compounded by a mixer, and then pelletized by an extruder. A method of producing an ABS resin with an extremely high butadiene ratio by a grafting method and compounding it with an AS resin is one of the methods.

  As shown in FIG. 3, the length (C in the figure) of the ring member 5 in the tube axis direction is the length (D in the figure) of the ring member placement portion 11, and the large diameter portion 13, the slope portion 15 and the small diameter Shorter than the sum of lengths of the parts 17). Further, the length (C in the figure) of the ring member 5 in the tube axis direction is longer than the sum (E in the figure) of the lengths of the small diameter portion 17 and the slope 15 and the length of the large diameter portion 13 (in the figure) D-E) longer. Therefore, the ring member 5 has a clearance 29 between it and at least one of the locking walls 9 in the state of being disposed in the ring member disposition portion 11. For this reason, the ring member 5 is slidable in the tube axis direction at the ring member arrangement portion 11.

  As described above, the reduced diameter portion 21 which is the side end portion of the ring member 5 is attached so as to be positioned on the large diameter portion 13 and slides on the large diameter portion 13. However, since the dimension of the ring member 5 is larger than the sum of the lengths of the small diameter portion 17 and the slope portion 15, the ring member 5 does not enter the small diameter portion 17 and the slope portion 15 as a whole.

  Next, the connection method of the male fitting part 1a and the female fitting part which can be fitted with this is demonstrated. FIG. 5 is a view showing a state in which the male fitting portion 1a and the female fitting portion 30a are disposed to face each other, and the male fitting portion 1a is inserted into the female fitting portion 30a. First, as shown in FIG. 5, the tip of the male fitting portion 1a is inserted into the female fitting portion 30a.

  The female fitting portion 30 a is formed on the inner peripheral portion of the tube 3. The female fitting portion 30a is expanded in diameter from the cylindrical portion 35, the slope portion 37 gradually reducing the diameter from the cylindrical portion 35, and the minimum inner diameter portion of the slope portion 37 in order from the tip end side (opening side) A ring fitting portion 39 is provided.

  As shown in FIG. 6A, when the male fitting portion 1a is pushed into the female fitting portion 30a from this state (arrow F in the figure), a ring member is formed on the slope portion 37 of the female fitting portion 30a. The taper part 33 of the outer periphery of the ring member 5 arrange | positioned at the arrangement | positioning part 11 contacts. Further, when the male fitting portion 1a is pushed into the female fitting portion 30a, as shown in FIG. 6 (b), the vicinity of the reduced diameter portion 21 of the ring member 5 is near the slope portion 15 of the male fitting portion 1a. It is possible to slide it up (arrow G in the figure).

  Fig.7 (a) is an enlarged view of ring member 5 vicinity in this state, and is the H section enlarged view of FIG.6 (b). The ring member 5 can slide in the ring member placement portion 11 until the tip of the claw portion 23 contacts the locking wall 9. At this time, since the length of the ring member 5 is longer than the length of the small diameter portion 17, the reduced diameter portion 21 side end portion of the ring member 5 is positioned on the large diameter portion 13.

  As shown in FIG. 7B, when the male fitting portion 1a is pushed into the female fitting portion 30a from this state (arrow F in the figure), the ring member 5 is formed on the slope portion 15 of the male fitting portion 1a. The convex portion 31 on the inner periphery of the ring is engaged, and the claw portion 23 of the ring member 5 can be elastically deformed to be reduced in diameter by being rotated so as to fall in the tube axial direction with the engagement portion as a fulcrum (Arrow I in the figure). Therefore, a part in the vicinity of the tip end portion of the claw portion 23 can be accommodated in the small diameter portion 17 of the male fitting portion 1a, and furthermore, the convex portion 31 can be accommodated on the slope portion.

  As shown in FIG. 8 (a), when the male fitting portion 1a is further pushed into the female fitting portion 30a from this state (arrow F in the figure), the end of the claw portion 23 is the female fitting portion 30a. Go through the slope 37 of the At this time, the resilient deformation of the claw portion 23 is released from the pressure from the slope portion 37, and is restored to the original diameter and enlarged (arrow J in the drawing). Thereby, the claw portion 23 is accommodated in the ring fitting portion 39 formed on the base side of the slope portion 37 of the female fitting portion 30a.

  FIG. 8 (b) is a view showing the connection structure 10 in which the male fitting portion 1 a and the female fitting portion 30 a are connected, obtained in this manner. In this state, the tip of the claw portion 23 is fitted with the ring fitting portion 39 of the female fitting portion 30a. For this reason, even when trying to pull out the female fitting portion 30a (arrow K in the figure), the movement of the ring member 5 is restricted by the locking wall 9, and the male fitting portion 1a is released from the female fitting portion 30a. It will not be pulled out.

  In this state, the outer peripheral surface of the water blocking member 7 is in close contact with the inner surface of the cylindrical portion 35 of the female fitting portion 30a. That is, the water blocking member 7 can fill the gap between the male fitting portion 1a and the female fitting portion 30a. For this reason, it is possible to prevent moisture from entering the connection structure 10 from the outside.

  In addition, since the water blocking member 7 is disposed closer to the base than the ring member 5, when the male fitting portion 1 a is pushed into the female fitting portion 30 a, the female fitting portion 30 a is the water blocking member 7. It does not receive resistance by the water blocking member 7 until it contacts with. For this reason, pushing resistance to the female fitting part 30a of the male fitting part 1a can be made small.

  The shapes of the male fitting portion 1a and the female fitting portion 30a are made of a material having sufficient strength, and are fitted to a tensile tester in a state in which both are fitted, and the tensile tester is used. The load was applied and the drawing load was determined. As a result, the drawing load satisfied 100 kg. Therefore, it has been confirmed that the drawing force of the joint portion has a sufficient drawing force.

  In addition, although the example using the ring member 5 which has the convex part 31 was demonstrated in this embodiment, this invention is not limited to this. Fig.9 (a) is the elements on larger scale which show the ring member 5a. The ring member 5 a has substantially the same configuration as the ring member 5, but differs in that the convex portion 31 is not formed.

  In FIG. 9A, as the shape of the ring member 5a, it is formed in a two-step acute-angled wedge shape formed by bending the inner peripheral portion. Here, even when the ring member 5a is formed to be bent in two steps, the ring member does not change in diameter from the claw portion to the reduced diameter portion 21.

  FIG. 9B shows a case where the inner surface of the ring member 5a has a wedge shape in which the diameter gradually and continuously decreases from the claws 23. As shown in FIG. Thus, the ring member 5a may have an inner peripheral portion formed in two steps, and the inner peripheral portion of the ring member 5a may have a wedge shape in which the diameter is gradually and continuously reduced from the claw portion 23 good.

  Fig.10 (a) is a figure which shows the connection method of the male fitting part 1a and the female fitting part 30a at the time of using the ring member 5a, and is a figure corresponding to Fig.7 (a). . When the ring member 5a is used, as in the case where the ring member 5 is used, when the male fitting portion 1a is inserted into the female fitting portion 30a, the tapered portion 33 of the ring member 5a is a female fitting portion The ring member 5 a slides in the ring member placement portion 11 until the tip of the claw portion 23 contacts the locking wall 9.

  As shown in FIG. 10 (b), when the male fitting portion 1a is further pushed into the female fitting portion 30a from this state (arrow F in the figure), the slope portion 15 of the male fitting portion 1a and the ring member The claw 23 can be rotated so as to fall down in the axial direction of the tube with the contact portion with the large diameter portion 13 of 5a as a fulcrum, and can be elastically deformed and reduced in diameter (arrow I in the drawing). That is, the claw portion 23 of the ring member 5a is made to fall in the tube axial direction with the contact portion between the inner peripheral side of the reduced diameter portion 21 of the ring member 5a and the large diameter portion 13 of the male fitting portion 1a as a fulcrum. It can be rotated. Therefore, a part in the vicinity of the tip end of the claw portion 23 can be accommodated in the small diameter portion 17 of the male fitting portion 1a.

  As shown in FIG. 10 (a), when the male fitting portion 1a is further pushed into the female fitting portion 30a from this state (arrow F in the figure), the end of the claw portion 23 is the female fitting portion 30a. Go through the slope 37 of the At this time, the resilient deformation of the claw portion 23 is released from the pressure from the slope portion 37, and is restored to the original diameter and enlarged (arrow J in the drawing). Thereby, the claw portion 23 is accommodated in the ring fitting portion 39 formed on the base side of the slope portion 37 of the female fitting portion 30a.

  FIG. 10 (b) is a view showing the connection structure 10 in which the male fitting portion 1 a and the female fitting portion 30 a are connected, obtained as described above. In this state, the tip of the claw portion 23 is fitted with the ring fitting portion 39 of the female fitting portion 30a. For this reason, even when trying to pull out the female fitting portion 30a (arrow K in the figure), the movement of the ring member 5 is restricted by the locking wall 9, and the male fitting portion 1a is released from the female fitting portion 30a. It will not be pulled out. Thus, even if it uses ring member 5a, the same effect as ring member 5 can be acquired.

  FIG. 12 (a) shows the ring member 5b. The ring member 5b is formed on the back surface of each of the claws 23 of the ring member 5a shown in FIGS. 9 (a) and 9 (b) in the center of the circumferential direction in the direction of the tube axis. The locking rib 24 is provided. The locking rib 24 needs to be formed at least on the back surface of the claw portion 23, but may be formed on the back surface of the reduced diameter portion. Here, when the locking rib 24 is extended to the back surface of the reduced diameter portion, the contact portion between the ring member arrangement portion of the male fitting portion and the ring member 5b is the entire back surface of the reduced diameter portion In addition, since only the lower surface of the locking rib 24 is provided, it is possible to reduce the frictional resistance during sliding movement of the ring member 5b.

  Since the ring member 5b has the locking rib 24 on the back surface of the claw portion 23, even if the convex portion 31 is not formed on the back surface of the claw portion 23 like the ring member 5, the ring member 5b can be made more reliably. The inside of the ring member arrangement portion 11 formed between the locking walls 9 can be slid. In addition, even if an offset load shifted from the tube axis direction acts on the ring member 5b and the end of the locking rib 24 abuts on the locking wall 9, even if the ring member 5b is inclined, the ring member 5b does not come off from the large diameter portion 13 of the conduit.

  In addition, as shown in FIG.12 (b), the thickness of the inside of an outer edge part is thin with respect to the thickness of the outer edge part of the nail surface of the nail | claw part 23 with respect to the example shown to Fig.12 (a) You may form. That is, as a form of the claw portion 23, a thin-walled portion thinner than the outer edge portion may be formed inside the outer edge portion. Thus, by forming the thickness of the inside of the outer edge portion thinner than the outer edge portion of the nail surface of the nail portion 23, the nail portion 23 can be easily deformed.

  Further, by forming a thin-walled portion thinner than the outer edge portion on the outer surface side of the claw portion 23, it is possible to reduce the insertion resistance when inserting the male fitting portion 1a into the female fitting portion 30a. it can. Also, even when a pulling force is applied to the female fitting portion 30a and the male fitting portion 1a, the thickness of the outer edge portion of the claw surface is formed thicker than the inside, so that the claw portion 23 buckles. I have not.

  As described above, the ring member 5b can be used in the same manner as the ring members 5 and 5a.

  Next, a conduit having the male fitting portion 1a will be described. FIG. 13 is a view showing a conduit 40a. The conduit 40a has a fitting structure at both ends, and is formed at a tube 3a, a male fitting portion 1a formed at one end of the tube 3a, and the other end of the tube 3a. , And a female fitting portion 30a having a shape capable of being fitted with the male fitting portion 1a.

  The electric wire tube 40a is formed with a continuous spiral waveform 41 of a predetermined pitch on the outer peripheral surface of the tube 3a between the male fitting portion 1a and the female fitting portion 30a. If such a conduit 40a is used, a plurality of conduits 40a can be connected to each other and used. For example, the method of connecting the electric conduit 40a is the same as the method of connecting the male fitting portion 1a and the female fitting portion 30a described above. That is, only by inserting the male fitting portion 1a of one conduit 40a and the female fitting portion 30a of another conduit 40a using a plurality of conduits 40a, the male type of one conduit 40a is obtained. It is possible to obtain the connection structure of the conduits in which the fitting portion 1a and the female fitting portion 30a of the other conduits 40a are fitted and connected. Therefore, in connection of conduits 40a, since screwing-in of a helical coupling etc. is not required, construction is easy.

  The shape of the tube is not limited to this. FIG. 14 (a) is a view showing a conduit 40b. 14 (b) is an enlarged cross-sectional view in the vicinity of the N portion in FIG. 14 (a), and FIG. 15 (a) is a cross-sectional view along the line L-L in FIG. 14 (a); Fig. 14 is a cross-sectional view taken along the line M-M in Fig. 14 (a). The conduit 40b is different in that a tube 3b is applied instead of the tube 3a of the conduit 40a.

  As shown in FIGS. 15 (a) and 15 (b), in the electric conduit 40b, a peak 43 (large diameter) is formed on the outer peripheral surface of the tube 3b between the male fitting portion 1a and the female fitting portion 30a. The diameter portion) and the valley portion 45 (small diameter portion) are alternately formed. The ridges 43 have a substantially square cross section, and the valleys 45 have a circular cross section. The diameter (length of one side) of the ridge portion 43 is larger than the outer diameter of the valley portion 45.

  By alternately providing the substantially square peak portions 43 with respect to the valley portions 45 as described above, when the conduits 40b are stacked, the conduits 40b can be stably arranged. The maximum outer diameter of the female fitting portion 30 a is smaller than the diameter (length of one side) of the peak portion 43. Therefore, when viewed from the end on the female fitting portion 30 a side, the female fitting portion 30 a does not protrude to the outer periphery of the peak portion 43. Therefore, when making peak parts 43 contact and piling up electric conduit 40b, female type fitting part 30a does not interfere with adjacent electric conduit 40b.

  Moreover, as shown in FIG.14 (b), a pair of projection part 47 is formed in the approximate-central part of the valley part 45 with respect to the pipe-axis direction of the tubular body 3b. Further, a flat portion 49 is formed between the protrusions 47 in the cross section of the tube 3b in the tube axial direction. Thus, by forming the groove shape between the protrusions 47, a cutter can be used along the groove, and cutting of the tube 3b is easy. Moreover, since the cutting position does not easily shift, the pipe 3b can be cut with high accuracy. Of course, although not shown in particular, the valley portion 45 can be formed as a straight pipe having a circular cross section without providing a pair of projections in the valley portion 45.

  Moreover, FIG. 16 is a figure which shows the conduit 40c. The conduit 40c is different in that a tube 3c is applied instead of the tube 3a of the conduit 40a. Similar to the tubular body 3b, the tubular body 3c has peak portions 43 of substantially square shape and valley portions 45 of circular shape alternately.

  The valley 45 of the tube 3 c is sufficiently longer than the length of the ridge 43. Moreover, the valley part 45 is formed in the wave shape 41a in the axial direction cross section of the tube 3c. The maximum outer diameter of the waveform in the valley portion 45 is smaller than the outer diameter of the peak portion 43. Similarly to the conduit 40b, when the conduits 40c are stacked, the conduit 40c can be stably arrayed by providing the mountain portion 43 having a substantially square shape.

  Next, a bell block connectable to the above-described conduit will be described. FIG. 17 is a cross-sectional view of the bell block 50. As shown in FIG. The bell block 50 can be connected to the conduit 40b or the like, and has the same structure as the female fitting portion 30a. That is, on the inner surface on one end side of the bell block 50, the cylindrical portion 35, the sloped portion 37 gradually decreasing in diameter from the cylindrical portion 35, and the sloped portion 37 are sequentially arranged from one tip end side (opening side). It has a ring fitting portion 39 expanded from the minimum inner diameter portion. Further, the other end of the bell block 50 is formed with a bell mouth 53 whose inner diameter gradually widens toward the open end.

  The bell block 50 is connected to the female fitting portion 30a with the male fitting portion 1a such as the electric conduit 40b inserted. Moreover, from the bell mouth 53, a wire etc. can be penetrated inside.

  FIG. 18 shows a hand hole 55 having a plurality of bell blocks 50. As shown in FIG. The hand hole 55 is, for example, a box made of concrete, and the bell block 50 is embedded in the concrete. That is, a plurality of through holes are formed by the bell block 50 on the side surface of the concrete hand hole 55. A connection hole may be formed in the hand hole 55, and the outer periphery of the bell block 50 inserted in the connection hole may be hardened with a mortar, an epoxy putty, or the like to fix the bell block 50 in the hand hole 55.

  FIG. 19 is a cross-sectional view showing a connection structure 10 a between the bell block 50 provided in the hand hole 55 and the electric conduit 40 b. In addition, it replaces with the conduit 40b and another conduit can also be applied. As described above, in the hand hole 55, a plurality of bell blocks 50 are disposed. The conduit 40 b is connected to part or all of the bell block 50. That is, the connection structure 10a includes the hand hole 55 having the bell block 50 and the conduit 40b, and the bell block 50 having the same structure as the female fitting portion 30a and the male fitting portion 1a of the conduit 40b. And are connected.

  The method of connecting the conduit 40b and the bell block 50 is the same as the method of connecting the conduits described above. That is, the male fitting portion 1a is inserted into the female fitting portion 30a of the bell block 50 in the same procedure as the method described above, instead of the female fitting portion 30a of one electric conduit 40b. Just do it. By doing this, the connection structure of the conduit for connecting the hand hole 55 having the bell block 50 having the same structure as the female fitting portion 30a of the conduit and the male fitting portion 1a of the conduit 40b. You can get 10a.

  Here, as described above, since the electric wire tube 40b is a rectangular electric wire tube, the electric wire tube 40b can be stacked in multiple tiers and can be compactly arranged. For this reason, while it becomes possible to reduce the amount of excavation of the earth and sand at the time of the burial of the conduit 40b, since it is possible to backfill it collectively, the load of construction reduces. As a result, the construction period can be shortened and the construction cost can be reduced.

  For example, the conduit 40b of the present invention can connect the conduits 40b only by inserting the male fitting portion 1a into the female fitting portion 30a. Therefore, unlike the conduits connected by the pipe joint having the spiral groove, for example, the conduits 40b of the same size can be directly connected to each other.

  The handhole 55 and the conduit 40b are connected by the male fitting portion 1a of the conduit 40b and a bell mouth having a fitting portion to be fitted with the female fitting portion 30a. Also good.

  FIG. 20 is a diagram showing the bell block 50a. In the present invention, a member that can be connected to the various conduits described above and has the same structure as the male fitting portion 1a or the female fitting portion 30a on at least one side is referred to as a tube joint. There is a case.

  Unlike the bell block 50, the bell block 50a includes a male fitting portion 1a. That is, one end of the bell block 50a has the same structure as the male fitting portion 1a, and the other end is the bellmouth 53. In this case, by projecting the male fitting portion 1a from the outer surface of the hand hole 55, connection with the female fitting portion 30a of the conduit can be made.

  Moreover, Fig.21 (a) is a figure which shows the pipe joint 60a. The fitting 60a has the same structure as the male fitting portion 1a at both ends. By using the pipe joint 60a, conduits provided with the female fitting portion 30a at the end can be connected to each other. For example, both ends can also connect the conduits of the female fitting portion 30a. Also, the female fitting portion 30a at the end of the conduit can be converted into the male fitting portion 1a.

  Here, in the case where the conduit 40b is repeatedly connected to form a conduit of the conduit 40b, for example, the bell block 50 having the shape of the female fitting portion 30a is disposed in two opposing hand holes 55. . Next, the male fitting portion 1 a is fixed to the hand hole 55 by inserting the male fitting portion 1 a into the bell block 50 of one hand hole 55. The female fitting portion 30a at the other end of the conduit 40b after fitting is extended by connecting the male fitting portion 1a of the next conduit 40b adjacent thereto.

  Also, in parallel with this operation, the male fitting portion 1a of the conduit 40b is inserted and connected to the bell block 50 of the other hand hole 55 facing each other. By connecting the male fitting portion 1a of the next conduit 40b adjacent to the female fitting portion 30a at the other end of the conduit 40b after the fitting is completed, the conduit is extended. When this operation is repeated from the hand holes 55 on both sides, a portion where the conduit 40b wraps is generated. Therefore, it is necessary to adjust the length of the conduit 40b. The length adjustment of the conduit 40b is performed by cutting and connecting the valleys 45 of the conduit 40b extended from both sides.

  By the way, when the electric conduit 40b is connected in this way, a pipe cut at one end by the female fitting portion 30a and at the other end by the valley portion 45 comes out as an end material. It is more economical to use this end material as a pipe for forming a conduit without discarding it. In order to use the end material, it is effective to use a pipe fitting 60a in which one end is a male fitting portion 1a and the other end is also a male fitting portion 1a.

  When the ends of the male fitting portion 1a are connected to the female fitting portion 30a of the end piece, a tube is obtained in which one end is cut by the male fitting portion 1a and the other end is the valley portion 45. By setting one end as the male fitting portion 1 a, it can be connected to one of the bell blocks 50 having a female shape formed in the two hand holes 55 facing each other. Further, by adjusting the length of the tube extending from the other hand hole 55, a wire conduit connecting the hand holes is formed. Here, when the cut tubes whose one end is the valley portion 45 face each other in this way, connection can be made using a dedicated joint for connecting the valley portions 45 facing each other.

  Here, as described above, the conduit 40b is provided with the two protrusions 47 facing the valley 45, and a groove shape is formed between the protrusions 47. In the case of cutting a conduit without such a projection 47 and not having a groove shape, there is no mark of the part to be cut and there is no guide groove for cutting, so when cutting The cutter may slip and the electric conduit may be cut obliquely. In particular, in the case of rainy weather, etc., since the conduit is wet, the conduit and the blade become slippery at the time of cutting, so the conduit is not cut at a predetermined position and is also easily cut diagonally. Thus, when attempting to connect the obliquely cut conduits, the positions of the ends of the conduits in the pipe joint may not be properly adjusted, and the connection at the pipe joint may not be possible. In such a case, the disconnected conduit is wasted.

  On the other hand, the conduit 40b can use a cutter along the groove by providing two projections 47 facing the valley 45 and forming a groove shape between the projections 47. For this reason, it is easy to grasp the cutting position, and it is possible to suppress the slip of the cutter. Therefore, the cutting position does not shift or is not cut obliquely.

  FIG. 21 (b) is a view showing a pipe joint 60b. One end of the pipe joint 60b has the same structure as the male fitting portion 1a, and the other end has the same structure as the female fitting portion 30a. By using the pipe joint 60b, it is possible to connect a conduit provided with the male fitting portion 1a at at least one end and a conduit provided with the female fitting portion 30a at at least one end. it can.

  FIG. 22 (a) is a view showing a pipe joint 60c. The fitting 60c has the same structure as the female fitting portion 30a at both ends. By using the pipe joint 60c, conduits provided with the male fitting portion 1a can be connected to each other at one end. For example, it is also possible to connect the conduits of the male fitting portion 1a at both ends. Also, the male fitting portion 1a at the end of the conduit can be converted to the female fitting portion 30a.

  Moreover, FIG.22 (b) is a figure which shows the pipe joint 60d. The pipe joint 60d has one end having the same structure as the female fitting portion 30a, and the other end having a helical corrugation 61 continuous with the outer surface (and the inner surface) of the tube. By using the pipe joint 60d, it is possible to connect a conduit provided with the male fitting portion 1a at at least one end and a conduit having a helical corrugated shape on the outer surface. Thus, if a pipe joint as shown in FIG. 22 (b) is used, a wire having a cross-sectional shape different from that of a wire tube having a square cross-sectional shape as in the present invention and a wire tube having a spiral wave shape on the outer surface. A different kind of pipe joint that connects the pipes can be realized.

  As described above, according to the present embodiment, since the ring member 5 is disposed on the outer surface of the male fitting portion 1a, the ring member 5 can be easily viewed. Further, when inserting the male fitting portion 1a into the female fitting portion 30a, the diameter expansion by the expansion of the circumferential length of the ring member due to the elastic repulsive force of the ring member 5 and the cross section in the tube axial direction of the claw portion The ring member 5 can be efficiently deformed by the effect of both of the diameter expansion by the recovery of the bending deformation.

  Therefore, even if the thickness of the claw portion of the ring member 5 to which the drawing force is applied is increased, the diameter of the ring member 5 can be easily reduced. As a result, the male fitting portion 1a and the female fitting portion 30a can be easily connected, and the male fitting portion 1a can be reliably prevented from coming off from the connected state.

  In addition, since the ring member 5 can slide in the ring member placement portion 11, when pushing the male fitting portion 1a into the female fitting portion 30a, the diameter of the end portion of the ring member 5 is increased in diameter It can be located near the boundary between the portion 13 and the slope portion 15. Therefore, at the time of connection, the ring member 5 can be easily deformed with the vicinity of the boundary between the large diameter portion 13 and the slope portion 15 and the vicinity of the contact portion with the ring member 5 as a fulcrum. In addition, when a force is applied in a direction in which the male fitting portion 1 a is pulled out, the ring member 5 moves and is positioned at the outer peripheral portion of the large diameter portion 13 of the ring member 5. For this reason, the diameter reduction of the ring member 5 can be suppressed.

  In particular, the ring member 5 has an acute wedge shape in which the thickness decreases from the tip of the claw portion 23 toward the reduced diameter portion 21, and the convex portion 31 is formed at a predetermined position on the inner peripheral portion of the reduced diameter portion 21. Therefore, when the diameter of the ring member 5 is reduced, the convex portion 31 and the inclined surface portion 15 in the ring member disposition portion 11 are in contact, and the ring member 5 can be easily deformed with the contact portion as a fulcrum.

  Further, since the water blocking member 7 is disposed closer to the base than the ring member 5, when the male fitting portion 1a is inserted into the female fitting portion 30a, the insertion resistance of the water blocking member 7 is not easily received. be able to. In addition, even if the lubricant is applied to the water blocking member 7, the lubricant does not adhere to the ring member 5.

  In addition, when using the ring member 5a which does not have the convex part 31, the convex part 31 fitted to the slope part 15 does not exist. Therefore, in the ring member placement portion 11, the inner surface of the ring member 5a in the vicinity of the end of the reduced diameter portion 21 of the ring member 5a moves to the vicinity of the end of the large diameter portion 13 at the boundary with the slope portion 15. can do. Also in this case, since the male fitting portion 1a is made to slide while being fitted to the female fitting portion 30a, compared with the case where the ring member 5a is fixedly inserted into the male fitting portion 1a. Insertion resistance is small and insertion is easy.

  In addition, since the conduits 40a and the like have the male fitting portion 1a at one end and the female fitting portion 30a at the other end, it is easy to connect a plurality of conduits 40a. It is.

  In particular, since the substantially square peak portions 43 and the circular valley portions 45 are alternately formed on the outer peripheral surface of the tube, the conduit 40b is stably stabilized when laminating the plurality of conduits 40b. The conduit 40b can be stacked. In the electric conduit 40b, a pair of projections 47 is formed substantially at the center of the valley 45 in the axial direction of the tube, and a groove is formed between the projections 47. The conduit 40a can be easily cut. Therefore, it is possible to maintain high accuracy of the cut position of the cut tube, and to construct a highly accurate conduit connection structure and a conduit of the conduit.

  Moreover, various conduits can be easily connected by using the pipe joint which comprises the male fitting part 1a or the female fitting part 30a at at least one end. Similarly, by using a bell block provided with the male fitting portion 1a or the female fitting portion 30a at one end, the bell block and the electric pipe can be easily connected.

  Although the embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention is not influenced by the above-described embodiments. It is apparent that those skilled in the art can conceive of various changes or modifications within the scope of the technical idea described in the claims, and they are naturally also within the technical scope of the present invention. It is understood that it belongs.

  Further, combinations of combinable embodiments are also included in the scope of the present invention.

1a ...... Male fitting portion 3, 3a, 3b, 3c ...... Tubes 5, 5a, 5b ...... Ring member 7 ...... Water blocking member 9 ...... Locking wall 10, 10a ...... ... connection structure 11 ... ... ring member arrangement portion 13 ... ... large diameter portion 15 ... ... slope portion 17 ... ... small diameter portion 19 ... ... opening portion 21 ... ... diameter reduction portion 23 ... ... claw portion 24 ... ... Locking rib 25 ... ... Slit 27 ... ... Water sealing member accommodation part 29 ... ... Clearance 30a ... ... Female fitting part 31 ... ... Convex part 33 ......... Taper part 35 ......... Tubular portion 37: Slope portion 39: Ring fitting portion 40a, 40b, 40c: Conduit tube 41, 41a: Wave shape 43: Mountain portion 45: Valley portion 47: Projection portion 49 ... Flat portion 50, 50a ... Bell block 53 ... Bell mouse 55 ... Hand holes 60a, 60b, 60c, 60d ... Pipe fitting 61 ... Wave shape

Claims (34)

A conduit having a male fitting portion formed on an outer peripheral portion in the vicinity of an end portion of a tubular body,
The male fitting portion is a pair of locking walls disposed apart in the tube axis direction;
A ring member disposed in an area sandwiched by the locking walls;
Equipped with
The ring member has a substantially C shape in which a part in the circumferential direction is opened,
The ring member includes a reduced diameter portion on one end side of the ring member, and a plurality of claws provided separately from each other with slits in the circumferential direction with respect to the reduced diameter portion. The diameter of the claws is gradually increased so that the outer diameter gradually increases from the reduced diameter portion toward the tip;
The ring member is disposed such that the tip end of the claw portion is located on the base side of the tube, and the reduced diameter portion is located on the tip side of the tube.
A large diameter portion is formed on the tip end side of the tube in the region sandwiched by the locking wall, and a small diameter portion is formed on the base side of the tube in the region sandwiched by the locking wall, A sloped portion is formed between the large diameter portion and the small diameter portion,
The length in the tube axis direction of the ring member is shorter than the sum of the lengths of the large diameter portion, the sloped portion and the small diameter portion, and the sum of the lengths of the small diameter portion and the sloped portion and the large diameter portion Longer than any of the length of
The electric wire is characterized in that the ring member has a clearance between the ring member and at least one of the locking walls, and is slidable in the axial direction of the tube in a region where the ring member is sandwiched by the locking walls. tube.   The conduit according to claim 1, wherein a locking rib formed in the axial direction is formed at the center of the circumferential direction of each of the claws on the back surface of the claw.   The water pipe according to claim 1, wherein a water blocking member is provided on the base side of the locking wall on the base side of the male fitting portion. A conduit having a fitting structure at both ends,
Tube body,
A male fitting formed at one end of the tube;
A female fitting portion formed at the other end of the tube and having a shape capable of being fitted to the male fitting portion;
Equipped with
The male fitting portion is formed on an outer peripheral portion of the tube, and is provided with a pair of locking walls spaced apart in the axial direction of the tube.
A ring member disposed in an area sandwiched by the locking walls;
Equipped with
The ring member has a substantially C shape in which a part in the circumferential direction is opened,
The ring member includes a reduced diameter portion on one end side of the ring member, and a plurality of claws provided separately from each other with slits in the circumferential direction with respect to the reduced diameter portion. The diameter of the claws is gradually increased so that the outer diameter gradually increases from the reduced diameter portion toward the tip;
The ring member is disposed such that the tip end of the claw portion is located on the base side of the tube, and the reduced diameter portion is located on the tip side of the tube.
A large diameter portion is formed on the tip end side of the tube in the region sandwiched by the locking wall, and a small diameter portion is formed on the base side of the tube in the region sandwiched by the locking wall, A sloped portion is formed between the large diameter portion and the small diameter portion,
The length in the tube axis direction of the ring member is shorter than the sum of the lengths of the large diameter portion, the slope portion and the small diameter portion, and the sum of the lengths of the small diameter portion and the slope portion and the large diameter Longer than any of the diameter lengths,
The ring member has a clearance between it and at least one of the locking walls, and is slidable in the axial direction of the pipe in a region where the ring member is sandwiched by the locking walls,
The female fitting portion is formed on the inner peripheral portion of the tubular body, and from the tip end, a cylindrical portion, a slope portion gradually reducing the diameter from the cylindrical portion, and a slope of the female fitting portion An electric wire tube comprising: a ring fitting portion expanded in diameter from a minimum inner diameter portion of the portion.   The electric pipe according to claim 4, wherein a water blocking member is provided on the base side of the locking wall on the base side of the male fitting portion.   The electric wire according to claim 5, characterized in that a spiral wave shape having a predetermined pitch continuous with the outer peripheral surface of the tubular body is formed between the male fitting portion and the female fitting portion. tube.   Between the male fitting portion and the female fitting portion, a large diameter portion as a substantially square peak portion and a small diameter portion as a circular valley portion are alternately formed on the outer peripheral surface of the tube. The electrical conduit according to claim 5, characterized in that:   A pair of protrusions are formed at a substantially central portion of the small diameter portion as the valley with respect to the tube axis direction of the tube, and a flat portion is formed between the protrusions in the tube axial cross section of the tube. The electrical conduit according to claim 7, characterized in that:   The conduit according to claim 7, wherein the small diameter portion as the valley portion is formed in a corrugated shape in a cross section in the axial direction of the tube.   The ring member has a tapered portion that decreases in diameter from the tip end of the claw portion toward the reduced diameter portion in a tube axial direction cross section, and the cross section of the claw portion is from the tip end of the claw portion to the reduced diameter portion The electric wire tube according to claim 4, characterized in that it has a wedge-like shape in which the thickness decreases in the direction of.   The electric wire tube according to claim 10, wherein the shape of the ring member is a two-step acute-angled wedge shape formed by bending an inner peripheral portion.   12. The conduit according to claim 10, wherein a curved convex portion protruding from an inner peripheral portion is formed at a predetermined position of the inner peripheral portion of the reduced diameter portion.   The locking rib formed toward the direction of a tube axis is formed in the center of the circumferential direction of each of the claws on the back surface of the claws. Conduit.   11. The electric wire tube according to claim 10, wherein the ring member is any of ABS resin, PP resin, hard vinyl chloride, or a mixed resin or polymer alloy of any of these and PC resin.   The conduit according to claim 5, wherein the water blocking member is disposed in a water blocking member accommodating portion formed on the base side of the locking wall on the base side of the male fitting portion. .   The electric pipe according to claim 5, wherein the water blocking member is either a rubber or a water expansion member. It is the connection structure of the conduit according to claim 4,
A wire comprising a plurality of the conduits, wherein the male fitting portion of one of the conduits and the female fitting portion of another of the conduits are fitted and connected. Tube connection structure. It is the connection structure of the conduit according to claim 4,
A handhole having a bell block, and the conduit;
A connection structure for a conduit according to the present invention, the bell block having the same structure as the female fitting portion is connected to the male fitting portion of the conduit. The handhole has a plurality of the bell blocks,
The connection structure of a conduit according to claim 18, wherein the conduit is connected to a part or all of the bell block.   A bell block connectable to the conduit according to claim 4, and having the same structure as the female fitting portion. 14. A method of connecting conduits according to claim 13, wherein
Inserting the tip of the male fitting portion into the female fitting portion;
Bringing the tapered portion of the outer periphery of the ring member disposed in the area between the locking walls into contact with the inclined surface of the female fitting portion;
Slide the ring member to the end of the large diameter portion in the vicinity of the inclined surface of the male fitting portion,
The claw portion of the ring member is a tube with the contact portion between the inner peripheral side of the reduced diameter portion of the ring member and the large diameter portion of the male fitting portion as a fulcrum The step of elastically deforming and reducing the diameter by rotating so as to fall in the axial direction, and the end portion of the claw portion passes through the inclined surface portion of the female type fitting portion, whereby the claw portion is the female type A method of connecting conduits, characterized in that the steps of being stored in the ring fitting portion formed on the base side of the slope portion of the fitting portion are sequentially performed. 13. A method of connecting conduits according to claim 12, wherein
Inserting the tip of the male fitting portion into the female fitting portion;
Bringing the tapered portion of the outer periphery of the ring member disposed in the area between the locking walls into contact with the inclined surface of the female fitting portion;
The convex portion formed at a predetermined position on the inner peripheral surface of the ring member is slid to the inclined surface portion of the male fitting portion, and the inner surface of the ring member is moved to the inclined surface portion of the male fitting portion. The convex portion on the periphery is engaged, and the claw portion of the ring member is turned so as to fall down in the direction of the tube axis with the engagement portion as a fulcrum to elastically deform and reduce the diameter of the claw portion. Storing the portion in the small diameter portion of the male fitting portion;
When the end of the claw portion passes through the inclined surface of the female fitting portion, the claw portion is formed on the ring fitting portion formed on the base side of the inclined surface of the female fitting portion. The connection method of the conduits characterized by performing the process accommodated in order. A method of connecting a conduit and a bell block according to claim 13,
The bell block has the same structure as the female fitting portion of the electrical conduit,
Inserting the tip of the male fitting portion into the bell block;
Bringing the tapered portion of the outer periphery of the ring member disposed in the area between the locking walls into contact with the sloped portion of the bell block;
Slide the ring member to the end of the large diameter portion in the vicinity of the inclined surface of the male fitting portion,
With the claw portion of the ring member as a fulcrum, the contact portion between the inner peripheral side of the reduced diameter portion of the ring member and the large diameter portion of the male fitting portion
A step of elastically deforming and reducing the diameter by rotating so as to fall down in the axial direction of the tube;
When the end of the claw portion passes through the sloped portion of the bell block, the claw portion is sequentially stored in the ring fitting portion formed on the base side of the sloped portion of the bell block A method of connecting a conduit and a bell block characterized in that: A method of connecting a conduit and a bell block according to claim 12.
The bell block has the same structure as the female fitting portion of the electrical conduit,
Inserting the tip of the male fitting portion into the bell block;
Bringing the tapered portion of the outer periphery of the ring member disposed in the area between the locking walls into contact with the sloped portion of the bell block;
Sliding the convex portion formed at a predetermined position on the inner circumferential surface of the ring member to the sloped portion of the male fitting portion;
The convex portion of the ring member is engaged with the sloped portion of the male fitting portion, and the claw portion of the ring member is rotated in the direction of the tube axis by using the engaging portion as a fulcrum. Elastically deforming to reduce the diameter, and storing a part of the claw portion in the small diameter portion of the male fitting portion;
When the end of the claw portion passes through the sloped portion of the bell block, the claw portion is sequentially stored in the ring fitting portion formed on the base side of the sloped portion of the bell block A method of connecting a conduit and a bell block characterized in that:   A pipe joint connectable to the conduit according to claim 4, wherein at least one end has the same structure as that of the male fitting portion.   26. A fitting as claimed in claim 25, characterized in that both ends have the same structure as the male fitting.   26. A tube fitting according to claim 25, wherein one end has the same structure as the male fitting portion and the other end is a bellmouth.   26. A tube fitting according to claim 25, wherein one end has the same structure as the male fitting portion and the other end has the same structure as the female fitting portion.   A pipe joint connectable to the conduit according to claim 7, wherein at least one end has the same structure as that of the female fitting portion.   30. A fitting as claimed in claim 29, characterized in that one end has the same structure as the female fitting and the other end is a bellmouth.   30. A tube according to claim 29, characterized in that one end has the same structure as said female fitting and the other end has a helical corrugation continuous with the outer surface of said tube. Fittings. A ring member used for a connection portion of a conduit,
The ring member is
It is approximately C-shaped with a part in the circumferential direction opening,
And a plurality of claws spaced apart from each other in the circumferential direction via slits with respect to the reduced diameter portion, and the claw The diameter of the portion is gradually increased so that the outer diameter gradually increases from the diameter reducing portion to the tip,
The ring axial section of the ring member has a tapered portion which decreases in diameter from the tip end of the claw portion toward the reduced diameter portion, and the cross section of the claw portion extends from the tip end of the claw portion to the reduced diameter portion The ring member according to claim 1, wherein the ring member has an acute-angled wedge shape whose thickness gradually decreases, or a thickness of a tip of the claw portion is thicker than the diameter-reduced portion.   The ring member according to claim 32, wherein a curved convex portion protruding from the inner peripheral portion is formed at a predetermined position of the inner peripheral portion of the reduced diameter portion.   34. The ring member according to claim 33, wherein a locking rib formed in an axial direction is formed at the center of the circumferential direction of each of the claws on the back surface of the claw.

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