JP2007037266A - Bell mouth with joint and pipe connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bell mouth with a joint which can prevent a cable from being non-insertable even if a hand hole is formed in soft ground or the like, and a pipe connecting structure. <P>SOLUTION: The bell mouth with the joint comprises a cylindrical part 10 which is embedded into the wall 3 of the hand hole 2 and of which the internal end opening 12 is opened at the internal side of the hand hole 2, and an accommodation cylinder 15 which is continuously arranged at the cylindrical part 10 and opened at the external side of the hand hole 2. In a state that the connecting end 9 of a connecting pipe body 5 is inserted into the accommodation cylinder by a prescribed amount from an external end opening 39 side along the pipe axial direction, the connecting end 9 is accommodated in the accommodation cylinder 15, and the come-off of the connecting end is regulated by a locking means 20. The connecting pipe body 5 is a corrugated pipe which has a protrusion 7 and a recess 6 alternately in the pipe axial direction. A regulation cylinder 16 which surrounds the protrusion 7 at the connecting end 9 side is continuously arranged at the external end side of the accommodation cylinder 15 in a state that the come-off is regulated. Upon the application of an external force which causes the displacement of a bell mouth axial line and a pipe shaft of the connecting pipe body 5, the bent and dent of the connecting pipe body 5 in the regulation cylinder 16 is regulated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bell mouth with a joint attached to a hand hole or the like embedded in the ground, and a pipe connection structure using the bell mouth with a joint.

  When laying cable conduits in the ground, handholes and manholes (hereinafter referred to as handholes, including both manholes) are installed at appropriate intervals between the conduits as relay points for cables. . Conventionally, a bell mouth with a joint that is attached to a peripheral wall of a handhole is known for connection to a cable line (connection pipe body) (see Patent Document 1).

  As shown in FIG. 13, the joint-attached bell mouth 80 includes a cylindrical portion 83 embedded in the wall 82 of the handhole 81 and a joint portion 84 provided continuously on the outer end side of the cylindrical portion 83. Prepare. Then, the end connecting portion 86 of the cable conduit (connecting pipe body) 85 is inserted and connected to the joint portion 84.

In this case, the joint portion 84 is provided with an engaging means having a ring-shaped body. That is, when connecting the connecting pipe body 85, the end connecting portion 86 passes through the ring-shaped body, and the engaging portion of the end connecting portion 86 is engaged with the ring-shaped body. For this reason, the ring-shaped body has a notch formed in a part thereof, and the diameter can be increased or decreased. Therefore, this ring-shaped body is fitted into the joint portion 84 in a loose fit, and the connecting tube body 85 is connected to the bell mouth 80 with a joint in a slightly wobbled state.
Japanese Patent No. 3430396

  However, when the hand hole 81 is arranged on the soft ground, due to the wobble, a sharp bend occurs at the joint between the bell mouth 80 and the connecting tube 85 at the hand hole 81. For this reason, it may be impossible to pass a test rod, a cable, or the like through a pipe line constituted by the bell mouth 80 and the connecting pipe body 85 or the like.

  The present invention has been made in order to solve the above-mentioned conventional drawbacks, and its object is to provide a bell with a joint that can prevent a cable from being inserted even if a handhole is arranged on soft ground or the like. To provide a mouse and tube connection structure.

  In order to solve the above-described problem, the bell mouth with a joint according to the present invention includes a cylindrical portion 10 embedded in the wall 3 of the hand hole 2 and having an inner end opening 12 opened to the inside of the hand hole 2, And a storage cylinder 15 which is provided on the outer end side of the tubular portion 10 and whose outer end opening 39 opens to the outside of the handhole 2, and the connection end 9 of the connecting tube 5 is connected to the outer end opening. In a state where a predetermined amount is inserted along the tube axis direction from the 39 side, the connection end portion 9 of the connection tube body 5 is stored in the storage tube portion 15, and the connection means 5 is removed by the engagement means 20. The connecting pipe body 5 is a corrugated tube in which a tube wall 8 having convex portions 7 and concave portions 6 alternately arranged in the tube axis direction is connected to the connecting end portion 9. Yes, and surrounds the convex portion 7 on the connection end 9 side of the connection tube body 5 in a state where the connection tube body 5 is prevented from coming off. The restriction cylinder part 16 is connected to the outer end side of the storage cylinder part 15, and is arranged in order from the engagement means 20 to the restriction cylinder part 16 in the direction away from the cylindrical part 10, and the bell mouth axis line. When the external force acts to deviate from the tube axis of the connecting tube body 5, the restriction tube portion 16 restricts the bending of the connecting tube body 5 inside the restricting tube portion 16.

  The connecting tube 5 is a corrugated tube in which a plurality of convex portions 7 having a substantially square cross section are formed at a predetermined pitch, and the regulating tube portion 16 is formed of a rectangular tube.

  Further, the connection end portion 9 of the connection pipe body 5 is formed of a cylindrical body, the one side length of the outer surface of the convex portion 7 is set larger than the outer diameter of the connection end portion 9, and the restriction cylinder portion 16 The dimension between the inner surfaces facing each other was made larger than the inner diameter dimension of the storage cylinder portion 15.

  Further, the restriction cylinder portion 16 surrounds the plurality of convex portions 7 of the connection pipe body 5.

  In addition, a connecting cylinder portion 55 is continuously provided on the outer end side of the storage cylinder portion 15, and a restriction cylinder portion 16 surrounding the plurality of convex portions 7 of the connecting pipe body 5 is continuously provided in the connecting cylinder portion 55. did.

  Furthermore, the length of the cylindrical portion 10 is adjusted by cutting at least the inner end opening 12 side of the cylindrical portion 10 as a corrugated tube portion 62 at the top of the peak portion 61 of the corrugated tube portion 62. Made possible.

  The bell mouth with another joint of the present invention is embedded in the wall 3 of the hand hole 2 so that its inner end opening 12 opens to the inside of the hand hole 2 and its outer end opening 54 is outside the hand hole 2. A corrugated tube comprising a joint-equipped bell mouth having a cylindrical portion 10 that opens to the side, and a connecting pipe 5 to be connected having a tube wall 8 having convex portions 7 and concave portions 6 alternately in the tube axis direction In addition, a regulation cylinder part 16 into which a plurality of convex parts 7 on the end part side of the connection pipe body 5 are inserted is connected to the outer end side of the cylindrical part 10, and the regulation cylinder part 16 Is provided with a retaining member 42 that engages with the recess 6 between the projections 7 of the connecting tube 5 to restrict the disconnection of the connecting tube 5 so that the bell mouth axis is displaced from the tube axis of the connecting tube 5. During the operation, the restriction tube portion 16 restricts the bending of the connecting pipe body 5 inside the restriction tube portion 16. It is characterized by a door.

  The pipe connection structure according to the present invention is a connecting pipe body 5 including a bell mouth 1 with a joint attached to a wall 3 of a handhole 2, and a pipe wall 8 having convex portions 7 and concave portions 6 alternately in the tube axis direction. In which the connection end 9 side of the connection tube body 5 is engaged in a state where a predetermined amount is inserted along the tube axis direction from the outer end opening side of the bell mouth 1 with a joint. And engaging means 20 for restricting the disconnection of the connection tube body 5, and in the engaged state of the connection tube body 5, the convex portion 7 on the connection end 9 side of the connection tube body 5 is surrounded to A restriction cylinder portion 16 is provided for restricting the bending of the connecting tube 5 in the bell mouth 1 with a joint when an external force action is generated in which the mouse axis is displaced from the tube axis of the connecting tube 5.

  In the bell mouth with a joint according to the present invention, the connecting tube is engaged with the connecting tube when the connecting end of the connecting tube is inserted by a predetermined amount along the tube axis direction from the outer end opening side. Therefore, it is only necessary to insert the connecting end portion of the connecting tube body from the outer end opening side along the tube axis direction as a connecting operation. That is, a so-called one-touch connection operation can be performed. Moreover, since the bending of the connecting tube inside the restricting tube is restricted by the restricting tube, the hand hole is arranged on the soft ground, and the bell mouth axis and the tube axis of the connecting tube are misaligned. Even if an external force acts, the bending of the connecting tube can be regulated. In particular, if there is no restriction cylinder portion, the connection tube body is slightly wobbled with respect to the bell mouth with a joint by the engagement by the engagement means. However, since the wobbling can be prevented by the restricting cylinder portion that is further away from the engagement portion on the side opposite to the cylindrical portion, the bending of the connecting tube body can be stably regulated. For this reason, even if the hand hole is arranged on soft ground or the like, the cable can be stably inserted into a pipe line constituted by a bell mouth with a joint and a connecting pipe body.

  The connecting tube is a corrugated tube whose convex part is formed in a substantially square cross section, and when the force to bend acts by forming the regulating cylinder part from a square cylindrical body, the convex part Is in surface contact with the inner surface of the restriction cylinder. For this reason, the bending (bending) of the connecting pipe body in the regulating cylinder portion can be reliably prevented.

  In addition, the connection end of the connection tube is formed of a cylindrical body, the one side length of the outer surface of the convex portion is set larger than the outer diameter of the connection end, When it is made larger than the inner diameter dimension of the storage cylinder part, the support area of the connection pipe body becomes large, and the bending (bending) of the connection pipe body in the regulation cylinder part can be stably prevented.

  Since the restriction cylinder portion surrounds the plurality of convex portions of the connecting pipe body, it is possible to improve the bend prevention. Further, in the case where a connecting tube portion is continuously provided on the outer end side of the storage tube portion, and a restricting tube portion surrounding the plurality of convex portions of the connecting tube body is provided on the connecting tube portion, a restricting tube is used. It is possible to stably prevent the connection pipe body from being bent (curved) within the section. In particular, if the connecting tube portion and the restricting tube portion are separate members and the restricting tube portion is attached to the connecting tube portion via a fixture or the like, the pitch of the unevenness of the connecting tube to be connected Depending on the above, it is possible to use extension cylinders having different lengths in the axial direction, and it is possible to correspond to various connecting pipes, and the construction at the site becomes easy.

  Since at least the inner end opening side of the cylindrical part is a corrugated tube part, it is cut at the top of the peak part of the corrugated pipe part. can do. For this reason, it can embed corresponding to the wall of various thickness. In addition, by cutting at the top of the peak portion, the cut end portion becomes a tapered portion that expands toward the tip (inside the hand hole when attached to the hand hole), and the opening portion is cut. It opens in a trumpet shape like the inner end opening of the cylindrical portion before the operation, and can be stably embedded in the wall of the hand hole as a bell mouth.

  In the bell mouth with another joint according to the present invention, in a state where the end portion of the connection tube is inserted into the restriction tube portion, the retaining member is engaged with the recess of the connection tube body so that the connection tube body is prevented from coming off. Since it regulates, it is only necessary to insert the end portion of the connecting tube body from the outer end opening side along the tube axis direction as a connecting operation. That is, a so-called one-touch connection operation can be performed. For this reason, it is not necessary to form a cylindrical connection end on the connection tube body, and the long connection tube body can be cut and used at any site (for example, a recess), and connected at the laying site. The length of the tube can be adjusted. In addition, when the external force acts to deviate the bell mouth axis and the tube axis of the connection tube body, the restriction tube portion restricts the bending of the connection tube body inside the restriction tube portion. Even if the hole is arranged and an external force is applied that causes the bell mouth axis to deviate from the tube axis of the connecting tube, the bending of the connecting tube can be restricted.

  In the pipe connection structure according to the present invention, the connection pipe body is engaged and connected in a state where the connection end portion of the connection pipe body is inserted by a predetermined amount from the outer end opening side of the bell mouth along the pipe axis direction. Since the disconnection of the tube body is restricted, it is only necessary to insert the connection end portion of the connection tube body from the outer end opening side along the tube axis direction as a connecting operation. That is, a so-called one-touch connection operation can be performed. Moreover, in the engaged state of the connecting pipe body, the connecting tube body is surrounded by the restricting cylindrical portion to restrict the bending of the connecting pipe body. Bending (curvature) can be avoided. For this reason, even if a hand hole is arranged on soft ground or the like, the cable can be stably inserted into a pipe line using this pipe connection structure.

  Next, specific embodiments of the joint-equipped bell mouth and pipe connection structure of the present invention will be described in detail with reference to the drawings. 1 is a half-cross sectional view of a bell mouth with a joint, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view taken along line XX of FIG. The joint-attached bell mouth 1 is attached to a wall (peripheral wall) 3 of a handhole 2 and connected to a connecting pipe body 5. The connecting tube 5 in this case is a corrugated tube made of a synthetic resin in which a tube wall 8 having annular recesses 6 and projections 7 alternately in the tube axis direction is connected to the connection end 9. As shown in FIG. 7 etc., the convex part 7 is formed in the cross-sectional substantially square shape, and the recessed part 6 is formed in the cross-sectional substantially circular shape. That is, the connecting tube 5 is a corrugated tube in which a plurality of convex portions 7 are formed at a predetermined pitch. The connecting tube 5 accommodates cables such as an electric cable and an optical fiber cable. Further, the connection end portion 9 of the connection tube body 5 is formed of a cylindrical body, and the one side length (B) of the outer surface of the convex portion 7 is set larger than the outer diameter of the connection end portion 9.

  The bell mouth 1 with a joint is made of a synthetic resin, and includes a cylindrical part 10 made of a cylindrical body embedded in the wall 3 and a joint part 11 on the outer end side of the cylindrical part 10. And the inner end opening part (inner end opening part of the bell mouth 1 with a joint) 12 of the cylindrical part 10 is opening in the hand hole 2 inside in the trumpet shape which expands toward the hand hole 2. FIG. In addition, a water-stop member (water-stop tape) 13 is wound around the cylindrical portion 10 at an intermediate portion in the axial center direction.

  The joint portion 11 includes a storage tube portion 15 into which the connection end portion 9 of the connection tube body 5 is inserted and engaged, and a regulation tube portion 16 provided continuously to the outer end side of the storage tube portion 15. The storage cylinder portion 15 includes a first cylinder portion 17 composed of a short-angle cylindrical body (octagonal cylinder body), and a short cylindrical body disposed between the first cylinder portion 17 and the storage cylinder portion 15. The large diameter part 19 is provided in the 2nd cylinder part 18 at the 1st cylinder part 17 side. For this reason, the first cylinder portion 17 forms a fitting space 22 into which the ring-shaped body 21 of the engaging means 20 described later is fitted, as shown in FIGS. . Further, a circumferential groove 23 is formed on the inner surface of the storage cylinder portion 15 by the large diameter portion 19.

  Moreover, the regulation cylinder part 16 consists of a square cylinder, and as shown with the phantom line of FIG. 1, the some convex part 7 .... by the side of the connection end part 9 of the connection pipe body 5 is accommodated (enclosed). For this reason, the regulation cylinder portion 16 has substantially the same inner surface dimensions A1 and A2 (see FIG. 2) facing the peripheral wall 14 (consisting of the four side walls 24), and the convex portion 7 of the connecting tube body 5. The length A between the inner surfaces A1 and A2 of the regulation cylinder part 16 facing each other is made larger than the inner dimension of the storage cylinder part 15. Furthermore, the internal axial length C is set to a length that can accommodate two to three convex portions 7 of the connecting tube 5. That is, the engaging means 20 and the restricting cylinder part 16 are arranged in order in the direction away from the cylindrical part 10.

  By the way, the connection end portion 9 of the connection pipe body 5 is provided with a circumferential concave groove 26 on the outer peripheral surface 25, and the outer surface of the end portion of the outer peripheral surface 25 faces toward one end side (tubular portion side). A circumferential bulging portion 27 that is an inclined surface 29 that is reduced in diameter is provided. That is, the end surface 28 of the circumferential bulge portion 27 becomes the engagement portion 30 that engages with the ring-shaped body 21 of the engagement means 20. A seal member (packing) 31 is fitted in the circumferential groove 26. The seal member 31 is formed of an elastic ring-shaped body having a triangular cross section, and in a free state, the outer peripheral surface is a tapered surface (tapered taper surface) whose diameter increases toward the outer end side.

  Moreover, as shown in FIGS. 4-6, the ring-shaped body 21 of the engaging means 20 has the notch part 32 in that part, and a diameter expands / contracts. That is, the ring-shaped body 21 includes a main body ring portion 33 having a rectangular cross section and an inner ring portion 34 having a triangular cross section that is connected to the inner peripheral surface of the main body ring portion 33. The inner ring portion 34 is disposed on the other end side (outer end side) of the main body ring portion 33, and an inner peripheral surface thereof becomes a guide inclined surface 35 that gradually increases in diameter toward one end side (inner end side). Yes. The other end edge 35 a of the guide inclined surface 35 of the inner ring portion 34 is made to coincide with the inner peripheral edge 36 a on the other end side of the main body ring portion 33, and the one end edge 35 b of the inner ring portion 34 is made to be the main body ring portion 33. Is opposed to an intermediate position in the width direction (thickness direction). Therefore, a locking step portion 37 is formed on the ring-shaped body 21 at the end surface of the inner ring portion 34.

  Then, as shown in FIG. 4, the ring-shaped body 21 is inserted into the fitting space 22 of the storage cylinder portion 15. At this time, since the ring-shaped body 21 can be expanded and contracted, it can be inserted by slightly reducing the diameter. And in the state inserted in the space 22 for fitting, the ring-shaped body 21 is fitted in the loose fitting shape, and expansion / contraction is possible. In FIG. 4, the regulation cylinder part 16 is omitted by cutting at the second cylinder part 18 of the joint part 11.

  As shown in FIG. 1, the joint-attached bell mouth 1 configured as described above has a cylindrical portion 10 embedded in the peripheral wall 3 of the handhole 2, and an inner end opening portion 12 inside the handhole 2. In addition, the outer end opening 39 of the storage cylinder 15 opens to the outside of the hand hole 2, and the regulation cylinder 16 is connected to the outer end of the storage cylinder 15.

  Then, the connecting tube 5 is connected to the joint-attached bell mouth 1 mounted (installed) on the peripheral wall 3 of the handhole 2. At this time, the connecting tube body 5 is inserted along the tube axis direction from the outer end opening 39 side (specifically, the outer end opening 40 of the regulating cylinder portion 16). When the bulging portion 27 of the connecting end portion 9 of the connecting pipe body 5 points to the ring-shaped body 21, the taper surface of the bulging portion 27 comes into contact with the guide inclined surface 35 of the inner ring portion 34 of the ring-shaped body 21. If further pushed in, the taper surface slides against the guide inclined surface 35 and enters the inner end side, and the ring-shaped body 21 expands in diameter. As a result, the bulging portion 27 can cross the inner ring portion 34. And if the bulging part 27 exceeds the internal ring part 34, the ring-shaped body 21 will reduce in diameter and will return to the original state. In this state, the engagement portion 30 of the connection end portion 9 of the connection tube body 5 engages with the locking step portion 37 of the ring-shaped body 21 to restrict the disconnection of the connection tube body 5. That is, since the ring-shaped body 21 is fitted in the fitting space 22, if the bulging portion 27 engages with the engaging portion 30, the connection tube body 5 is detached and the connection tube body 5 is moved to the outer end side. Further entry can be prevented. In this engaged state, the outer peripheral edge portion of the seal member 31 is in pressure contact with the inner surface of the second cylindrical portion 18.

  Thus, in a state where the connection end 9 of the connection tube 5 is inserted by a predetermined amount along the tube axis direction from the outer end opening 39 side, the engagement portion 30 of the connection tube 5 is engaged and this Since the disconnection of the connecting pipe body 5 is restricted, it is only necessary to insert the connecting end 9 of the connecting pipe body 5 from the outer end opening 39 side along the pipe axis direction as a connecting operation. That is, a so-called one-touch connection operation can be performed. In addition, since a plurality of (two in the illustrated example) convex portions 7 of the connecting tube 5 are surrounded by the restricting cylinder portion 16, an external force action in which the bell mouth axis and the tube axis of the connecting tube 5 deviate from each other. The bending of the connecting tube 5 inside the restriction cylinder 16 is restricted by the restriction cylinder 16. In particular, if there is no restriction cylinder portion, the connection tube body is slightly wobbled with respect to the bell mouth with a joint by the engagement by the engagement means. However, since the wobbling can be prevented by the restricting cylinder portion that is further away from the engagement portion on the side opposite to the cylindrical portion, the bending of the connecting tube body 5 can be stably regulated. For this reason, even if the handhole 2 is arrange | positioned in soft ground etc. and the external force which the bell mouth axis line and the pipe axis of the connection pipe body 5 shift | deviates acts, the bending of the connection pipe body 5 can be controlled. Therefore, even if the hand hole 2 is arranged on soft ground or the like, the cable can be stably inserted into the pipe line constituted by the bell mouth 1 with joint, the connecting pipe body 5 and the like.

  Moreover, in the engaging means 20 provided with the ring-shaped body 21 as described above, when the connecting end 9 of the connecting tube 5 is inserted, the bulging portion 27 of the connecting end 9 is guided to the inclined guide surface 35. The ring-shaped body 21 expands in diameter and allows the connection end 9 to be inserted. And since the latching step part 37 of the ring-shaped body 21 engages with the engaging part 30 of the connection pipe body 5 in the insertion state of the predetermined amount of the connection pipe body 5, the connection pipe from the bell mouth 1 with this joint It is possible to prevent the body 5 from coming off. For this reason, it is possible to simplify the connection work and to improve the certainty of preventing the disconnection.

  Furthermore, since the connecting tube body 5 is a corrugated tube in which the convex portion 7 is formed in a substantially square cross section, and the regulating tube portion 16 is a square tube body, when a force to bend acts, The convex portion 7 is in surface contact with the inner surface of the restricting cylinder portion 16, and it is possible to reliably prevent bending (curving) at the connection portion of the connecting tube body 5 by the restricting cylinder portion 16. In addition, the connection end 9 of the connection tube 5 is formed of a cylindrical body, and the length of one side of the outer surface of the convex portion 7 is set to be larger than the outer diameter of the connection end 9, and faces the regulation cylinder 16. Since the inner surface dimensions A1 and A2 are set to be larger than the inner diameter dimension of the storage cylinder portion 9, the support area of the connection tube body 9 is increased, and the connection tube body 5 is bent in the restriction cylinder portion 16. Bending (curving) can be stably prevented.

  In this way, in the pipe connection structure constituted by the bell mouth 1 with a joint, the connection pipe body 5 and the engaging means 20 as shown in FIG. 1, the connection end 9 of the connection pipe body 5 is connected to the bell mouth with the joint. It is possible to connect by simply inserting from the outer end of 1. In addition, since the bending of the connecting tube 5 in the restricting cylinder portion 16 is restricted in the engaged state of the connecting tube 5, the cable is stably inserted into the conduit using this tube connecting structure. Can be made. Incidentally, in FIG. 1, only the cylindrical portion 10 is embedded in the peripheral wall 3 of the handhole 2, but the entire bell mouth 1 with a joint, that is, all of the cylindrical portion 10, the storage cylindrical portion 15, and the regulating cylindrical portion 16. May be embedded in the peripheral wall 3 of the handhole 2. In this way, if the entire bell mouth 1 with a joint is embedded in the peripheral wall 3 of the handhole 2, the restriction cylinder portion 16 itself is backed up by the concrete of the peripheral wall 3 of the handhole 2. It is possible to further suppress the bending of the connecting pipe body 5 at.

  Next, FIGS. 7 to 10 show other embodiments. In this case, the bell mouth 1 with a joint is obtained by omitting the storage tube portion 15 in FIG. The inner end opening 12 opens to the inside of the hand hole 2, the outer end opening 54 of the cylindrical portion 10 opens to the outside of the hand hole 2, and the regulating cylindrical portion 16 is formed at the outer end of the cylindrical portion 10. It is connected continuously. The outer end opening of the restriction cylinder portion 16 constitutes the insertion port 40. Further, the engagement means 20 having the ring-shaped body 21 is not used, and the retaining member 42 having the locking piece 41 is used. The retaining member 42 in this case is formed by punching and bending a metal plate as a thin rigid material. That is, the retaining member 42 includes a base piece 43 attached to one side wall 24 of the restriction cylinder portion 16 and the locking piece 41 provided continuously from an end edge of the base piece 43 on the side opposite to the insertion port. Prepare. The locking piece 41 is sequentially inclined toward the central axis side of the restricting cylinder portion 16 toward the opposite insertion port side. The locking piece 41 is provided with a biasing piece 44. The urging piece 44 is formed by providing a substantially U-shaped cutout portion on the locking piece 41 and raising the remaining portion surrounded by the cutout portion in the direction opposite to the central axis. For this reason, the locking piece 41 and the urging piece 44 function as a leaf spring and are displaced in a direction approaching and separating from the central axis. Further, biting claws 45, 45 projecting toward the anti-insertion port are provided at both ends of the end edge (long side) of the locking piece 41 on the anti-insertion port side.

  Further, the base piece 43 is provided with a pair of stopper pieces 46, 46. The stopper pieces 46, 46 are formed by providing a substantially U-shaped cutout in the base piece 43 and raising the remaining portion surrounded by the cutout in the direction opposite to the central axis. The side wall 24 is provided with through holes 47, 47, and the stopper pieces 46, 46 of the retaining member 42 inserted into the regulation cylinder portion 16 are inserted into the through holes 47, 47 of the side wall 24, The stopper pieces 46, 46 exposed to the bend are bent. As a result, the retaining member 42 is attached to the side wall 24 with the base piece 43 of the retaining member 42 in contact with the inner surface of the side wall 24.

  By the way, the recessed part 48 is provided in the approximate center part of one side wall 24 of the regulation cylinder part 16, and the protrusion 49 which protrudes inside by this is formed. The protrusion 49 includes an inclined surface 50 that sequentially inclines toward the central axis toward the opposite insertion port side, and a rising surface 51 that rises from the leading edge of the inclined surface 50 toward the opposite axis. The retaining member 42 is disposed on the side wall 24 (24a) provided with the protrusion 49 and the side wall 24 (24b) facing the side wall 24 (24b).

  And even when connecting the bell mouth 1 with a joint and the connecting pipe body 5, the connecting pipe body 5 is opened at the outer end of the regulating cylinder portion 16 as in the bell mouth 1 with a joint shown in FIG. What is necessary is just to insert from the part (insertion port) 40 along a pipe-axis direction. Unlike the case shown in FIG. 1, the connecting tube 5 in this case does not need to be provided with the connecting end 9 having the engaging portion 30, and instead of the connecting end 9, a short cylindrical end is provided. A portion 9a is provided. When inserting the connection tube body 5, a sealing material (packing) 38 is externally fitted to the end portion 9 a of the connection tube body 5. That is, as will be described later, when the connecting tube 5 is inserted into the bell mouth 1 with the joint, as shown in FIG. 10, the inner peripheral surface of the tubular portion 10 and the outer periphery of the end 9a of the connecting tube 5 The packing 38 is interposed between the surfaces. If the connecting tube body 5 is inserted, the protruding portion 7 on the end side of the connecting tube body 5 comes into contact with the locking piece 41, and if further pushed in from this contacted state, the locking piece 41 is Due to the spring property, the projection 7 swings outward (on the side opposite to the center line) and allows the protrusion 7 to enter the cylindrical portion 10 side. And when this convex part 7 respond | corresponds to the locking piece 41, the protrusion 49 is gradually pushed outward via the locking piece 41 and the biasing piece 44, and the side wall 24 of the control cylinder part 16 is outward. The projection 7 is allowed to pass through.

  Thereafter, as shown in FIG. 10, the cylindrical portion side end surface 52 of the convex portion 7 on the cylindrical portion 10 side abuts on a step surface 53 formed between the regulating cylindrical portion 16 and the cylindrical portion 10, In this state, a part of the outer edge portion on the insertion port side of the convex portion 7 is in contact with the rising surface 51. Further, the locking piece 41 is restored by its elastic force and the urging force of the urging piece 44 corresponding to the recess 6 and is fitted into the recess 6. At this time, the base piece 43 is sandwiched between the corresponding convex portion 7 and the side wall 24, and the inclined state of the locking piece 41 can be stably held (secured). Further, since the engaging pieces 41 are provided with biting claws 45, 45, the biting claws 45, 45 bite into the end face of the convex portion 7 on the insertion port side.

  As described above, in the bell mouth with a joint shown in FIGS. 7 to 10, when the connection pipe body 5 is inserted, the locking piece 41 swings to allow the connection pipe body 5 to be inserted. The body 5 can be inserted easily. And when the convex part 7 by the side of the cylindrical part 10 of the connection pipe body 5 exceeds this latching piece 41, the latching piece 41 returns to an inclined shape and it fits into the recessed part 6 of the connection pipe body 5. Therefore, it is possible to prevent the connecting pipe body 5 from coming off from the bell mouth 1 with the joint. For this reason, it is possible to simplify the connection work and to improve the certainty of preventing the disconnection. Further, the biting claws 45, 45 bite into the end face on the insertion port (outer end opening) 40 side of the convex portion 7, and a part of the outer edge portion on the insertion port side of the convex portion 7 is formed on the rising surface 51. It is in contact. For this reason, the omission function can be improved. In this embodiment, as shown in FIG. 10, in the state where the connecting tube 5 is connected to the bell mouth 1 with the joint, the connecting tube 5 has three convex portions 7 and the concave portions 6. Two of them are fitted in the restriction cylinder part 16, but it is of course not limited to these numbers.

  Moreover, in this bell mouth with a joint, since the engaging means 20 having the ring-shaped body 21 is not used, it is not necessary to provide the connection end portion 9 having the engaging portion 30. For this reason, as the connection tube body 5 corresponding to the bell mouth with the joint, the long connection tube body 5 can be used by cutting at an arbitrary portion (for example, a recess), and the connection tube body at the laying site 5 length adjustments are possible. In addition, in the engaged state of the connecting tube body 5, the plurality of convex portions 7 (two in the illustrated example) at the end portion of the connecting tube body 5 are surrounded by the restriction cylinder portion 16, and the connecting tube body 5. The bend is regulated. For this reason, a cable can be stably inserted in the pipe line using this pipe connection structure.

  Next, FIG. 11 shows another bell mouth 1 with a joint. In this case, a connecting cylinder part 55 is connected to the outer end side of the storage cylinder part 15, and the restricting cylinder part 16 and the connecting cylinder part 55 are connected to the connecting cylinder part 55. The extended cylinder portion 56 is continuously provided. That is, the joint-attached bell mouth 1 includes a tubular portion 10 and a joint portion 11 connected to the outer end side of the tubular portion 10, and the joint portion 11 is a connection end portion of the connecting pipe body 5. The storage cylinder 15 is inserted and engaged, and the connection cylinder 55 is connected to the outer end of the storage cylinder 15.

  And the connection cylinder part 55 consists of a short square cylinder, the edge part of the extension cylinder part 56 which consists of a square cylinder is inserted, and the connection cylinder part 55 and the extension cylinder part 56 are integrated. The connecting cylinder part 55 and the extension cylinder part 56 may be fixed by using means such as adhesion, welding, and fusion, or by using a fixing tool such as the locking claw 57 shown in FIG. When the locking claw 57 is used, the locking claw 57 has inclined pieces 58 that are sequentially inclined toward the center axis direction toward the inside of the handhole. Then, a concave recess 59 is provided on the outer surface of the end of the extension cylinder 56, and the extension cylinder 56 is inserted into the connecting cylinder 55 so that the locking claw 57 is engaged with the recess 59. . That is, by inserting the extension cylinder part 56 into the connecting cylinder part 55, the inclined piece 58 of the locking claw 57 is pressed at the end of the extension cylinder part 56, and the inclination piece 58 is swung outward. Thus, the insertion of the end portion of the extension cylinder portion 56 is allowed. And when the inclination piece 58 respond | corresponds to the recessed part 59, what is necessary is just to make it return to an original state and to fit into the recessed part 59. FIG.

  Further, a plurality of convex portions 7... On the connection end portion 9 side of the connection pipe body 5 are accommodated (enclosed) in the restriction cylinder portion 16 configured by the extension cylinder portion 56. For this reason, the extension cylinder part 56 makes the dimension between the inner surfaces which the surrounding wall 63 (consisting of the four side walls 64) face substantially the same, and the length dimension B of each side of the convex part 7 of the connecting pipe body 5. (Refer to FIG. 1) It is substantially the same as or slightly larger, and the length in the axial direction is a plurality of the projections 7 of the connecting pipe body 5 (in the example of the figure, there are seven, but of course this is not limited to this). Not long). Further, in the bell mouth 1 with a joint shown in FIG. 11, although not shown, an engagement means 20 having a ring-like body 21 as shown in FIGS. 4 to 6 and the like is provided. In this case, since the configuration of the storage cylinder portion 15 and the like is the same as that of the storage cylinder portion 15 and the like shown in FIG. 1, the same reference numerals are given to the same configuration and the description thereof is omitted. .

  Even in the bell mouth 1 with a joint shown in FIG. 11, the connection pipe 5 is connected from the insertion port 40 (the outer end opening of the restriction cylinder portion 16 and the outer end opening of the extension cylinder portion 56). If the end portion 9 is inserted, the engagement portion 30 of the connection tube body 5 is engaged with the ring-shaped body 21 so that the connection tube body 5 can be prevented from coming out to the outer end side and coupled. it can. Further, in the engaged state of the connecting tube body 5, the connecting tube body 5 is bent by surrounding the plurality of convex portions 7. Therefore, the same effect as the bell mouth 1 with a joint shown in FIG. 1 can be exhibited. In addition, if the connecting cylinder part 55 and the extension cylinder part 56 are separate members and the extension cylinder part 56 is attached to the connecting cylinder part 55 via a fixture, the connecting pipe 5 to be connected is connected. Depending on the pitch of the projections and depressions, it is possible to use the extension cylinder portion 56 having a different axial length, and it can be used for various connection pipe bodies 5, which facilitates construction on site.

  By the way, as shown in FIG. 12 as the cylindrical part 10, the corrugated pipe part 62 by which the recessed part (valley part) 60 and the convex part (crest part) 61 are alternately arrange | positioned along a pipe-axis direction is provided in an outer peripheral surface. It may be. In this case, the concave portion 60 and the convex portion 61 are each formed in an annular shape, and the cross-sectional shape of the peak portion 61 is substantially triangular. And it is made to cut | disconnect at the top part of this peak part 61. FIG. That is, as shown in FIG. 12, for example, when the total length of the corrugated tube portion 62 is L, one or two peak portions 61 on the other end side are cut from the one end to the corrugated tube. The length dimension of the part 62 can be shortened like L1 and L2. That is, the length of the cylindrical portion 10 can be adjusted. In addition, by cutting at the top of the peak portion 61 in this manner, the inner end opening 12 that expands in a trumpet shape can be formed. In this cutting, of course, the top of any peak 61 of the corrugated tube 62 can be cut.

  As described above, the corrugated tube portion 62 is cut at the top of the arbitrary peak portion 61, so that the corrugated tube portion 62 can be cut according to the thickness of the wall 3 of the handhole 2 to be mounted. For this reason, it can be embed | buried corresponding to the wall 3 of various thickness. Further, by cutting at the top of the peak portion 61, the cut end portion becomes a tapered portion that expands toward the tip, and the inner end opening portion 12 of the tubular portion 10 before the opening portion is cut. It can be stably embedded in the wall 3 of the hand hole 2 as a bell mouth.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, in each of the above embodiments, the connecting tube 5 is a corrugated tube in which the convex portion 7 is formed in a substantially square cross section, but of course, even if the convex portion 7 having a circular cross section has, A spiral tube may be used. For this reason, the restriction cylinder portion 16 is not limited to a square cylinder as shown in the figure. For example, if the convex portion 7 of the connecting tube 5 is circular, it can be constituted by a cylindrical body, a polygonal cylinder or the like in which the convex portion 7 of the connecting tube 5 is accommodated as the restricting cylindrical portion 16. Furthermore, since the restriction | limiting cylinder part 16 should just restrict | limit the bending of the connection pipe body 5, the increase / decrease is arbitrary as the number which accommodates the convex part 7, and at least 1 should just exist. However, if a plurality of convex portions 7 are accommodated, the accommodation length in the restriction cylinder portion 16 becomes large, which is more preferable in restricting the bending. In addition, when the retaining member 42 is used as the engagement means 20, it is provided on the pair of side walls 24a and 24b facing each other in FIG. 7 and the like, but may be provided on the other side walls 24c and 24d. Further, in FIG. 11, the end of the extension cylinder 56 constituting the restriction cylinder 16 is fitted into the connection cylinder 55, but the end of the extension cylinder 56 is externally connected to the connection cylinder 55. You may make it fit. Furthermore, as shown in FIG. 12, if the corrugated tube portion 62 is provided, even if the entire tubular portion 10 is configured by the corrugated tube portion 62, only the inner end opening side is used as the corrugated tube portion 62. May be configured. Further, the pitch of the mountain valley portions 61, 60 of the corrugated tube portion 62, the height dimension of the mountain portion 61, and the like can be arbitrarily set. Further, the number of the bell mouths 1 with joints arranged in one hand hole 2 may be single or plural. By the way, in each said embodiment, although the connecting tube 5 is inserted in a predetermined amount, the bell mouth 1 with a joint is engaged with the connecting tube 5. In this engaged state, the restriction cylinder portion 16 can be arbitrarily set within a range in which at least one convex portion 7 of the connecting tube body 5 can be surrounded. In addition, although it does not specifically limit as a raw material of the bell mouth 1 with a joint, or the connection pipe body 5, For example, if formed with polyolefin resin, such as a polyethylene resin (PE) and a polypropylene resin (PP), water resistance and It is preferable in terms of excellent weather resistance and little deterioration with time.

It is a semi-cylindrical sectional view showing an embodiment of a bell mouth with a joint of the present invention. It is a front view of the bell mouth with a joint. It is XX sectional drawing of the said FIG. It is a perspective view of the bell mouth with a joint. It is a front view of the ring-shaped body of an engaging means. It is sectional drawing of the ring-shaped body of an engaging means. It is a perspective view of other embodiment of the bell mouth with a joint of this invention. It is sectional drawing of the said bell mouth with a joint. It is a principal part disassembled perspective view of the said bell mouth with a joint. It is sectional drawing which shows the connection pipe body connection state of the said bell mouth with a joint. It is a simplified sectional view of another embodiment of a bell mouth with a joint of this invention. It is principal part simplified sectional drawing of another embodiment of the bell mouth with a coupling of this invention. It is a side view of the conventional bell mouth with a joint.

Explanation of symbols

  2 .. Hand hole, 3 .. Wall, 5 .. Connection tube, 6 .. Recess, 7 .. Projection, 8 .. Tube wall, 10 .. Cylindrical body, 12. 16 ··· Restriction tube portion, 20 ·· Engaging means, 39 ·· Outer end opening portion, 42 ·· Stopping member, 55 ·· Connection cylinder portion, 61 ·· Mountain portion, 62 ·· Corrugated tube portion

Claims (9)

  A cylindrical portion (10) embedded in the wall (3) of the hand hole (2) and having an inner end opening (12) opened to the inside of the hand hole (2), and an outside of the cylindrical portion (10) The outer end opening (39) is connected to the end side, and the outer end opening (39) is provided with a storage cylinder (15) that opens to the outside of the hand hole (2), and the connection end (9) of the connection tube (5) In a state where a predetermined amount is inserted along the tube axis direction from the outer end opening (39) side, the connection end (9) of the connection tube (5) is stored in the storage cylinder (15). , A bell mouth with a joint in which disconnection of the connecting tube (5) is restricted by the engaging means (20), wherein the connecting tube (5) has a convex portion (7) at the connecting end (9). And corrugated pipes having tube walls (8) alternately having recesses (6) in the pipe axis direction, and connected in a state where the connection pipe body (5) is not pulled out. A restriction cylinder part (16) surrounding the convex part (7) on the connection end part (9) side of the body (5) is connected to the outer end side of the storage cylinder part (15), and the cylindrical part (10) In the direction away from the engagement means (20) from the engagement means (20) in order from the restriction cylinder part (16), in the case of an external force action in which the bell mouth axis line and the tube axis of the connection tube body (5) are displaced, A bell mouth with a joint, wherein the restriction tube portion (16) restricts the bending of the connecting tube (5) inside the restriction tube portion (16).   The connecting tube (5) is a corrugated tube in which a plurality of convex portions (7) having a substantially rectangular cross section are formed at a predetermined pitch, and the restriction tube portion (16) is formed of a rectangular tube. The bell mouth with a joint according to claim 1.   The connection end (9) of the connection tube (5) is formed of a cylindrical body, and the length of one side of the outer surface of the projection (7) is set larger than the outer diameter of the connection end (9). 3. The bell mouth with a joint according to claim 2, wherein a dimension between the inner surfaces facing each other of the regulation cylinder part (16) is larger than an inner diameter dimension of the storage cylinder part (15).   The bell mouth with a joint according to any one of claims 1 to 3, wherein the regulating cylinder portion (16) surrounds the plurality of convex portions (7) of the connecting pipe body (5).   A connecting tube portion (55) is continuously provided on the outer end side of the storage tube portion (15), and a plurality of convex portions (7) of the connecting tube (5) are provided on the connecting tube portion (55). The bell mouth with a joint according to any one of claims 1 to 4, characterized in that a restriction cylinder portion (16) is provided continuously.   By cutting at least the inner end opening (12) side of the tubular portion (10) as the corrugated tube portion (62) at the top of the peak portion (61) of the corrugated tube portion (62), the tubular portion is formed. The joint-equipped bell mouth according to any one of claims 1 to 5, wherein the length of the portion (10) is adjustable.   Embedded in the wall (3) of the hand hole (2), its inner end opening (12) opens inside the hand hole (2) and its outer end opening (54) is outside the hand hole (2). A bell mouth with a joint provided with a tubular portion (10) that is open to the tube, and the connecting tube (5) to be connected has a convex portion (7) and a concave portion (6) alternately in the tube axis direction. A corrugated tube having a wall (8), and a plurality of convex portions (7) on the end side of the connecting tube (5) are inserted into the outer end side of the cylindrical portion (10). The regulation tube portion (16) is continuously provided, and the regulation tube portion (16) is engaged with the recess (6) between the projections (7) of the connection tube body (5) to connect the connection tube body (5). A retaining member (42) that restricts the slipping of the bellows is provided, and when the external force acts to deviate the bell mouth axis from the tube axis of the connecting tube (5), the regulating cylinder (16) Control tube section (16) connecting tube inside (5) of the folded joint with the bellmouth, characterized in that regulating the bend.   A bell mouth with a joint (1) mounted on the wall (3) of the hand hole (2), and a pipe wall (8) having alternately convex parts (7) and concave parts (6) in the pipe axis direction. A pipe connection structure for connecting to a connection pipe body (5), wherein the connection end (9) of the connection pipe body (5) is connected to the pipe shaft from the outer end opening (39) side of the jointed bell mouth (1). Engaging means (20) for engaging in a state in which a predetermined amount is inserted along the direction and restricting the disconnection of the connecting tube (5), and in the engaged state of the connecting tube (5), A bell mouth with a joint (1) surrounds the convex portion (7) on the connection end portion side of the connection pipe body (5), and acts as an external force when the bell mouth axis is displaced from the pipe axis of the connection pipe body (5). The tube connecting structure is provided with a restriction cylinder portion (16) for restricting the bending of the connecting tube body (5) in the inside.   The connecting tube (5) is a corrugated tube in which a plurality of convex portions (7) having a substantially rectangular cross section are formed at a predetermined pitch, and the restriction tube portion (16) is formed of a rectangular tube. 9. The pipe connection structure according to claim 8, wherein