JP2013068237A - Separation preventing means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separation preventing means capable of reliably preventing separation of a spigot pipe from a socket pipe by securing the sufficient locking length for locking a pawl part to the outer circumferential surface of the spigot pipe, and increasing locking force of the claw part to lock the socket pipe thereby, and also preventing any twist of the spigot pipe and the socket pipe.SOLUTION: The separation preventing means for preventing separation of the spigot pipe from the socket pipe includes a plurality of locking pieces 3 having claw parts 3a, 3a to be locked to the outer circumferential surface of the spigot pipe and arranged along the circumferential direction, and an accommodation recess 4e formed on the socket pipe side where the spigot pipe is inserted and fitted and where each locking piece 3 is accommodated. The pawl parts 3a, 3a are formed in a substantially spiral shape extending in the circumferential direction of the spigot pipe and extending in the pipe axial direction.

Description

  The present invention has a claw portion that is locked to the outer surface of one fluid pipe, a plurality of locking pieces arranged along the circumferential direction, and the other fluid pipe into which one fluid pipe is fitted. The present invention relates to a disengagement preventing means for preventing disengagement of fluid pipes formed on the side and comprising an accommodating recess in which each locking piece is accommodated.

  In the conventional separation preventing means, the claw portion of the retaining member (locking piece) and the claw portion of the retaining member adjacent to the retaining member in the pipe circumferential direction are respectively locked to the outer peripheral surface of the insertion portion. In this state, it is arranged to overlap each other in the tube axis direction, and the contact area of the claw portion is continuous in the tube circumferential direction between the retaining members adjacent to each other to prevent the insertion portion and the receiving portion from coming off. The effect is improved (for example, refer patent document 1).

Patent No. 44441549 (5th page, Fig. 4)

  However, as in Patent Document 1, even if the contact area of the claw portion is continued in the pipe circumferential direction between the retaining members adjacent to each other, the contact area of the claw portion is not sufficient, such as an earthquake or uneven settlement. There is a problem that the insertion portion and the receiving portion cannot be prevented from moving against the strong external force.

  The present invention has been made paying attention to such a problem, and the claw portion locks the receiving tube by sufficiently taking a locking length at which the claw portion is locked to the outer peripheral surface of the insertion tube. It is an object of the present invention to provide a detachment preventing means that can increase the locking force to prevent the insertion tube and the receiving tube from detaching reliably and also prevent the insertion tube and the receiving tube from twisting.

In order to solve the above-mentioned problem, the separation preventing means of the present invention comprises:
A claw portion that is locked to the outer surface of one fluid pipe, and a plurality of locking pieces arranged along the circumferential direction, and formed on the other fluid pipe side into which the one fluid pipe is fitted. And a detachment preventing means for preventing detachment of the fluid pipes, each of which includes a storage recess in which each locking piece is stored.
The claw portion is characterized by being formed in a substantially spiral shape extending in the circumferential direction of the one fluid pipe and extending in the pipe axis direction.
According to this feature, the claw portion of the locking piece extends in the circumferential direction of the fluid tube and is formed in a substantially spiral shape extending in the tube axis direction, so that the claw portion is locked to the outer surface of the fluid tube. Since the stop length can be taken sufficiently, it is possible to increase the locking force with which the claw portion locks one of the fluid pipes, thereby reliably preventing the fluid pipes from being separated from each other. Moreover, since the nail | claw part is extended also in the pipe-axis direction, the twist of fluid pipes can also be prevented. Furthermore, since the locking force by the claw portion does not concentrate on one section of the fluid pipe but is dispersed in the tube axis direction, damage due to the locking force concentration of the claw portion hardly occurs on the inner surface of the fluid pipe. Damage can be avoided.

The separation preventing means of the present invention includes:
The plurality of locking pieces are arranged so that the ends of the claw portions of the locking pieces adjacent to each other overlap in the circumferential direction when viewed in the tube axis direction.
According to this feature, the claw portions of the plurality of locking pieces are locked without interruption in the circumferential direction when viewed in the tube axis direction, so that not only can the locking force be maintained over the entire circumferential direction of the fluid pipe. Further, the locking force can be further increased at the place where the ends of the claw portions overlap each other.

The separation preventing means of the present invention includes:
The storage recess is provided with a pressing portion that presses each of the locking pieces in the inner diameter direction of the one fluid pipe.
According to this feature, not only can the locking force be increased from the beginning of the disposition prevention means by pressing the locking piece in the inner diameter direction of the fluid pipe by the pressing portion provided in the storage recess, but also the fluid The pressing force can be adjusted for each locking piece positioned along the circumferential direction of the tube.

The separation preventing means of the present invention includes:
The storage recess is provided with a contact portion that presses the locking piece in the inner diameter direction of the one fluid pipe by coming into contact with the locking piece that is about to move relatively in the direction in which the fluid pipes are separated from each other. It is characterized by that.
According to this feature, even if an external force is applied between the fluid pipes, the contact portion can press the locking piece in the inner diameter direction by using this external force, thereby preventing the separation.

It is sectional drawing which shows the fluid pipe | tube with which the removal prevention means in Example 1 was attached. It is AA sectional drawing in FIG. It is a bottom view which shows the internal peripheral surface of a cover part. (A) is sectional drawing which shows the state which the latching piece is pressed toward the outer peripheral surface of an insertion part with a press volt | bolt, (b) is an insertion tube and a receiving tube in a detachment | leave direction. It is sectional drawing which shows the locking piece at the time of moving. It is a figure which shows a mode that the locking piece was arrange | positioned at the outer peripheral surface of an insertion tube. It is a sectional side view which shows the 1st modification of a removal prevention means. It is a sectional side view which shows the 2nd modification of a removal prevention means. It is a sectional side view which shows the 3rd modification of a removal prevention means. It is a sectional side view which shows the 4th modification of a removal prevention means. It is a bottom view which shows the internal peripheral surface of the cover part in Example 2. FIG.

  A mode for carrying out the disengagement preventing means according to the present invention will be described below based on examples.

  The separation preventing means according to the first embodiment will be described with reference to FIGS. Hereinafter, the front side of the sheet of FIG. 1 and the left side of the sheet of FIG. 2 will be described as the front side of the separation preventing means.

  As shown in FIG.1 and FIG.2, the insertion tube 1 which is one fluid tube and the receiving tube 2 which is the other fluid tube in the present embodiment are, for example, for waterworks buried in the ground, It is a fluid pipe made of ductile cast iron, other cast iron, steel, vinyl chloride, polyethylene, or polyolefin, and the end of the receiving pipe 2 on the side of the pipe axis C direction has a larger diameter than other parts of the receiving pipe 2 The insertion port 1a that can be inserted into the reception port 2a is formed at the end of the insertion tube 1 on the tube axis C direction side. In the case where the insertion tube 1 and the reception tube 2 are metal fluid tubes, the inner peripheral surfaces of the insertion tube 1 and the reception tube 2 are separated from the fluid flowing in the insertion tube 1 and the reception tube 2. As a rust prevention treatment for preventing rust, the coating layer 10 is formed of mortar or rust preventive paint. In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, sewage, etc., gas or liquid of gas or gas and liquid It may be a mixture.

  A flange 2b in which a part of the outer peripheral surface extends along the circumferential direction toward the diameter-enlarging direction side of the receiving portion 2a is formed at the distal end portion of the receiving portion 2a, and the flange 2b has a pipe axis C direction. In this embodiment, six through holes 12 are formed in parallel with each other. Further, a pusher 5 for pressing an annular seal member (not shown) is provided on the outer peripheral surface 1c of the insertion tube 1 in the entire circumferential direction, and the pusher 5 is provided at a position corresponding to the through hole 12 of the flange 2b. There are six through holes 12 '. Bolts and nuts 8 are inserted into the through holes 12 and 12 ', respectively, and the pusher wheel 5 is tightened in the direction of the flange 2b, so that the sealing member has an inner peripheral surface of the receiving portion 2a and an outer peripheral surface of the insertion portion 1a. Is pressed in the circumferential direction, and the gap is sealed in a sealed manner. In this embodiment, the pusher wheel 5 is provided on the outer peripheral surface 1c of the insertion tube 1 in the entire circumferential direction. However, the pusher wheel 5 may be formed in a ring shape by being divided into a plurality of parts and connected.

  Between the insertion tube 1 and the receiving tube 2 connected in this manner, the detachment preventing means 4 of the present invention that covers the insertion portion 1a and the receiving portion 2a is attached. The detachment preventing means 4 has divided cover portions 4a and 4b, and the cover portions 4a and 4b are engaged with the outer peripheral surface 1c of the insertion tube 1 so that the insertion portion 1a and the reception portion 2a As a pressing portion for pressing the locking piece 3 in the inner diameter direction of the insertion tube 1. A pressing bolt 7.

  These cover parts 4a and 4b are formed in the substantially semicircle shape which makes | forms a ring | wheel by connecting the cover connection parts 4c and 4c formed in the both ends of the circumferential direction side with the connection members 4d and 4d, respectively. Hereinafter, only the cover part 4a is demonstrated about these cover parts 4a and 4b about the same structure.

  As shown in FIG. 2, an end portion of the cover portion 4a on the receiving portion 2a side is formed with a flange portion 4h having a protruding portion 4j protruding toward the inner diameter direction of the receiving portion 2a. The part 4h is constructed from the outer peripheral surface 1c side of the insertion tube 1 to the rear end surface 2c side of the flange 2b. As described above, the cover portion 4a is supported by the receiving portion 2a via the flange 2b because the rear end surface 2c of the flange 2b and the protrusion 4j come into contact with each other and are locked so as not to be detached. .

  At this time, as shown in FIGS. 2 and 3, the flange 2b and the press ring 5 are accommodated in the case portion 4i which is located on the inner surface side of the flange portion 4h and is a hollow space of the cover portion 4a. In this embodiment further in the direction of the receiving pipe 2 than 4i, the bolts and nuts 8 are accommodated in the spaces 4g and 4g extending in two places. Therefore, when the cover portions 4a and 4b are tightened, the flange 2b, the push wheel 5 and the bolt / nut 8 do not interfere with each other. In this embodiment, the spaces 4g and 4g are provided in two places, but the present invention is not limited to this. For example, the spaces 4g and 4g may be provided in a plurality of places such as three or more, and the bolts and nuts 8 for tightening the flange 2b and the press wheel 5 It is preferable to form in correspondence with quantity and shape.

  Next, the locking piece 3 will be described. As shown in FIGS. 1 to 5, the locking piece 3 is housed in each housing recess 4 e of the detachment preventing means 4, and is locked to the outer peripheral surface 1 c of the insertion tube 1 to receive the insertion portion 1 a. It is a member for preventing relative movement with the mouth 2a.

  As shown in FIG. 5, the locking piece 3 is formed in the circumferential direction of the insertion tube 1 in the present embodiment and has a claw portion 3 a that is a portion locked to the outer peripheral surface 1 c of the insertion tube 1. Respectively. Furthermore, each locking piece 3 extends in a substantially arc shape in the circumferential direction of the insertion tube 1 along the outer peripheral surface 1c of the insertion tube 1, and has a substantially spiral shape extending slightly curved in the tube axis C direction. It has a shape. Further, the claw portion 3a of the locking piece 3 is along the both ends in the longitudinal direction of the inner peripheral surface of the locking piece 3 having a substantially spiral shape as described above, that is, along the outer peripheral surface 1c of the insertion tube 1. It extends in a substantially arc shape in the circumferential direction of the insertion tube 1 and forms a substantially spiral shape extending in a slightly curved direction in the tube axis C direction so as to protrude and extend toward the outer peripheral surface 1 c of the insertion tube 1. It is installed. In the present embodiment, two claw portions 3a and 3a are formed on each locking piece 3 and are separated from each other in the tube axis direction. Further, a tapered surface 3 b whose diameter increases toward the receiving tube 2 is formed at the outer surface end portion of the locking piece 3 on the side in the separation direction.

  Thus, the claw portions 3a and 3a of the locking piece 3 are formed in a substantially spiral shape extending in a substantially arc shape in the circumferential direction of the insertion tube 1 and extending slightly curved in the tube axis C direction. The locking region can be extended, the locking force of the locking piece 3 can be increased, and not only the circumferential direction of the insertion tube 1 but also the insertion tube 1 in the tube axis C direction. It will be locked to the outer peripheral surface 1c, and the twist of the insertion tube 1 and the receiving tube 2 can also be prevented. Furthermore, since the locking force by the claw portions 3a and 3a is not concentrated on one cross section orthogonal to the tube axis C direction of the insertion tube 1, but is dispersed in the tube axis C direction. Effects such as damage hardly occur on the inner surface of the insertion tube 1, and local damage of the insertion tube 1 can be avoided.

  In the present embodiment, the claw portions 3a and 3a formed in a substantially spiral shape as described above are provided along both longitudinal end portions of the inner peripheral surface of the locking piece 3 formed in a substantially spiral shape. However, the present invention is not limited to this. For example, the locking piece is provided in a band shape in a direction perpendicular to the direction of the tube axis C, and only the claw portion 3a is substantially spiral on the inner peripheral surface of the locking piece. May be formed. Further, the claw portions 3a may be provided on the inner peripheral surface of each locking piece 3 only in one or a plurality of three or more.

  Next, the storage recess 4e will be described. As shown in FIGS. 1 and 2, a storage recess 4 e for storing and arranging the locking piece 3 inside the cover portion 4 a along the circumferential direction of the cover portion 4 a is provided on the inner peripheral surface of the cover portion 4 a on the inlet tube 1 side. Are opened toward the outer peripheral surface 1c of the insertion tube 1 (three in this embodiment), and each of the storage recesses 4e is provided for each separation width L that is a predetermined interval in the circumferential direction of the cover portion 4a. They are spaced apart.

  Locking pieces 3 are stored in the storage recesses 4e, respectively. When the locking pieces 3 are stored in the storage recesses 4e, the locking pieces 3 are formed on both end surfaces of the locking pieces 3 in the circumferential direction. The rubber body 11, which is an elastic member, is engaged and attached to the groove 3 d (see FIG. 5), and the locking piece 3 to which the rubber body 11 is attached is stored in the storage recess 4 e, so that the rubber body 11 is It arrange | positions, elastically deforming in the accommodation recessed part 4e.

  Each rubber body 11 may be detached from the storage recess 4e by using an elastic restoring force generated by being interposed in a gap between the lock piece 3 and the storage recess 4e while being elastically deformed. Is prevented. The groove 3d is not limited to both end faces in the circumferential direction of the locking piece 3, but provided on the entire periphery of the side surface of the locking piece 3, so long as the locking piece 3 is prevented from falling from the storage recess 4e. Good. Moreover, the member accommodated in the groove 3d is not limited to the rubber body 11, and an elastic resin body, a spring body, or the like may be accommodated.

  Thus, after the locking piece 3 is stored in the storage recess 4e while preventing the drop, the cover connecting portions 4c and 4c of the cover portions 4a and 4b are fastened with the connecting members 4d and 4d as described above. Thus, an annular detachment prevention means 4 is attached to the outer peripheral surface 1c of the insertion tube 1 and the detachment prevention means 4 is supported by the receiving portion 2a via the flange 2b. And are connected.

  Next, the pressing part will be described. The storage recess 4e is provided with a pressing bolt 7 as a pressing portion of the present invention that presses each locking piece 3 in the inner diameter direction of the insertion tube 1.

  By pressing the locking piece 3 in the inner diameter direction of the insertion tube 1 by the pressing bolt 7 provided in the housing recess 4e, not only can the locking force be increased from the beginning of the disposition preventing means 4, but also the fluid The pressing force can be adjusted for each locking piece 3 located along the circumferential direction of the tube.

  More specifically, a screw hole 6 facing the radial direction of the detachment preventing means 4 is formed in the central portion in the circumferential direction of each storage recess 4e and in the central portion in the tube axis C direction, and the cover portion 4a of the cover portion 4a is formed in the screw hole 6. By screwing the pressing bolt 7 from the outer diameter direction to the inner diameter direction, the pressing surface 7a which is the tip portion in the screwing direction of the pressing bolt 7 presses the pressed surface 3f which is the outer surface of the locking piece 3, The claw portions 3a, 3a of the locking piece 3 are brought into pressure contact with the outer peripheral surface of the insertion tube 1 (see FIG. 4). The pressing bolt 7 and the screw hole 6 are not limited to the position and quantity of the present embodiment. For example, two screw holes are provided at both ends in the circumferential direction of each storage recess 4e, and one storage recess 4e is provided. Alternatively, two pressing bolts may be screwed. Furthermore, the pressing part of the present invention may not be provided specially. In addition, the pressing portion is not limited to the pressing bolt 7, and the locking piece 3 may be pressed against the outer peripheral surface of the insertion tube 1 using, for example, a pressing lever, or the pressing portion may be provided on the inner bottom surface of the storage recess. A bulging portion that bulges in the inner diameter direction may be provided, and the locking piece 3 may be pressed by the bulging portion using tightening of the cover portions 4a and 4b.

  Next, a description will be given of the locking piece 3 and the housing recess 4e when an external force is applied to the insertion tube 1 and the receiving tube 2 connected by the separation preventing means 4 as described above.

  As described above, the tapered surface 4f is provided on the inner side surface of the storage recess 4e so as to expand from the insertion tube 1 direction toward the receiving tube 2 direction.

  Even if an external force is applied to the insertion tube 1 and the receiving tube 2, the taper surface 4 f that is a contact portion presses the locking piece 3 in the inner diameter direction by using this external force, and the separation is performed. Can be prevented. That is, the taper surface 4 f abuts on the locking piece 3 that is about to move relatively in the direction in which the insertion tube 1 and the receiving tube 2 are separated from each other, thereby pressing the locking piece 3 in the inner diameter direction of the insertion tube 1. The contact portion of the present invention is configured.

  More specifically, as shown in FIG. 4A, the locking piece 3 is housed in the housing recess 4e, and the pressing bolt 7 is screwed in the inner diameter direction so that the pressing surface 7a of the pressing bolt 7 is The pressed surface 3 f of the locking piece 3 is pressed, and the locking piece 3 is pressed against the outer peripheral surface of the insertion tube 1. Further, the tapered surface 4f formed in the storage recess 4e and the tapered surface 3b formed on the locking piece 3 described above have an inclination of substantially the same angle, and the tapered surface 4f and the tapered surface 3b are surfaces. In contact.

  As shown in FIG. 4 (b), when an external force is applied to the insertion tube 1 and the receiving tube 2, the taper surface 4f of the housing recess 4e supported by the receiving tube 2 is applied. Thus, the tapered surface 3b of the locking piece 3 that is to move relative to the insertion tube 1 slides in the inner diameter direction along the tapered surface 4f. The taper surface 4f of the housing recess 4e is reduced in diameter in the direction in which the insertion tube 1 is detached, and the taper surface 3b is inserted by the relative movement of the taper surface 3b of the locking piece 3 to the taper surface 4f. It comes to press in the radial direction of the mouth tube 1.

  Since the claw portions 3a and 3a further bite into the outer peripheral surface 1c of the insertion tube 1 by pressing the tapered surface 4f of the storage recess 4e in the radial direction of the insertion tube 1, the locking force of the locking piece 3 is increased. Is improved, and separation of the insertion tube 1 and the receiving tube 2 is prevented. The contact portion is not limited to the tapered surface 4f. For example, a contact member may be provided in the gap between the storage recess 4e and the locking piece 3, and the contact portion is separated into the insertion tube 1 and the receiving tube 2. What is necessary is just to press the latching piece 3 to an inner diameter direction by the contact part when the external force to try acts.

  As described above, according to the detachment preventing means of the present invention, there are a plurality of engagement members that have claw portions 3a and 3a that are engaged with the outer peripheral surface 1c of the insertion tube 1 and that are disposed along the circumferential direction. The stopper piece 3 is formed on the receiving tube 2 side into which the insertion tube 1 is inserted, and includes a storage recess 4e in which each locking piece 3 is stored. The claw portions 3a and 3a are formed in a substantially spiral shape extending in the circumferential direction of the insertion tube 1 and extending in the tube axis C direction. 3a can sufficiently take the locking length that is locked to the outer peripheral surface 1c of the insertion tube 1, so that the claw portions 3a and 3a can increase the locking force for locking the receiving tube 2 to increase the insertion tube. 1 and the receiving pipe 2 can be reliably prevented from separating. Moreover, since the nail | claw parts 3a and 3a are extended also in the pipe-axis direction, the twist with the insertion tube 1 and the receiving tube 2 can also be prevented. Furthermore, since the locking force by the claw portions 3a and 3a is not concentrated on one cross section orthogonal to the tube axis C direction of the insertion tube 1, but is dispersed in the tube axis C direction. Effects such as damage hardly occur on the inner surface of the insertion tube 1, and local damage of the insertion tube 1 can be avoided.

  Next, as shown in FIG. 6, a first modification of the detachment preventing means of the present invention will be described. The sealing material 13 is provided in an annular gap provided in the entire circumferential direction of the inner peripheral surface of the receiving portion 20a. The insertion portion 1 a and the receiving portion 20 a are closed in a sealing manner by the sealing material 13. In addition, a bulging portion 20b in which a part of the outer peripheral surface bulges along the circumferential direction toward the diameter increasing direction of the receiving portion 20a is formed at the distal end portion of the receiving portion 20a.

  A cover portion 40a configured in the same manner as the above-described cover portion 4a is provided so as to cover the bulging portion 20b formed in this manner, and a protrusion 40j protruding in the radial direction of the receiving portion 20a is provided. The flange 40h is provided on the rear end surface 20c of the bulging portion 20b, and the detachment preventing means 40 is locked so that the rear end surface 20c of the bulging portion 20b and the protrusion 40j come into contact with each other and cannot be detached. Thus, it is supported by the receiving portion 20a via the bulging portion 20b.

  Since the sealing material 13 is fitted into an annular gap provided in the entire circumferential direction of the inner peripheral surface of the receiving portion 20a, the sealing member 13 is sealed in a sealed manner without using the pusher wheel 5, and therefore, a disengagement preventing means. The labor and cost when installing 40 can be reduced. In addition, by this, the case portion 4i of the separation preventing means 4 in which the flange 2b and the pusher wheel 5 described above are housed and arranged, and the spaces 4g and 4g extending further in the direction of the receiving pipe 2 from the case portion 4i, Since it is not necessary, the separation preventing means 40 can be reduced in size.

  Also, as shown in FIG. 7, the second modification of the detachment preventing means of the present invention will be described. Like the first modification described above, the second modification is provided in the entire circumferential direction of the inner peripheral surface of the receiving portion 30a. The sealing material 14 is fitted into the annular gap, and the insertion portion 1a and the receiving portion 30a are sealed in a sealed manner by the sealing material 14. Further, a detachment preventing means 41 is extended over the outer peripheral surface 1c of the insertion tube 1 at the distal end of the receiving portion 30a.

  First, this makes it possible to reduce the trouble and cost when installing the separation preventing means 41 by being sealed in a sealed manner without using the push wheel 5, and to reduce the size of the separation preventing means 41. Can do. Further, since the detachment preventing means 41 extends from the receiving portion 30a and is integrated, it is not necessary to support the detachment preventing means 41 as a separate body on the receiving portion 30a, and the detachment preventing means 41. And the receiving portion 30a can be in a strong connection state.

  Next, as shown in FIG. 8, a third modification of the detachment preventing means of the present invention will be described. The insertion portion 1a is inserted into the receiving portion 2a with the same configuration as that of the above-described embodiment, and A sealing material 15 is interposed in the gap between the mouth portion 1a and the receiving portion 2a in the circumferential direction. Further, a flange 21b whose outer peripheral surface extends along the circumferential direction toward the diameter-enlarging direction side of the receiving portion 2a is formed at the periphery of the tip of the receiving portion 2a, and the through hole 17 is parallel to the tube axis C direction. Is drilled.

  The detachment prevention means 42 provided on the side of the insertion tube 1 of the flange 21b is a detachment prevention push wheel composed of cover portions 42a and 42b having a divided structure. In addition, this push ring which is a detachment preventing means is not necessarily limited to a divided structure including a plurality of cover portions, and may be formed in an integral annular shape. These cover portions 42a and 42b are formed in a substantially semicircular shape having a ring shape by tightening a cover connecting portion (not shown) formed at both end portions on the circumferential side with a connecting member. The cover portion 42a includes the locking piece 3, the storage recess 4e, and the pressing bolt 7 in the same manner as described above, and the pressure contact portion 16 for pressing the seal material 15 in the tightening direction is extended. Yes. Further, the cover portion 42b has a pressure contact portion 16 'extending in the direction of the sealing material 15, and further, a through hole 17' is formed at a position corresponding to the through hole 17 of the flange 21b. The bolts and nuts 9 are inserted into the through holes 17 and 17 ', and the separation preventing means 42 is tightened in the direction of the flange 21b, whereby the sealing material 15 is pressed against the pressure contact portions 16 and 16' of the cover portions 42a and 42b.

  When the sealing material 15 is pressed against the pressure contact portions 16 and 16 'of the cover portions 42a and 42b, the gap between the insertion portion 1a and the receiving portion 2a is closed in a sealing manner, and provided in the cover portion 42a. Since the separation preventing means 42 is strongly locked to the insertion portion 1a by the locking piece 3, the storage recess 4e, and the pressing bolt 7, the insertion portion 1a and the receiving portion 30a are sealed by the sealing material 15. Can be maintained in a sealed state.

  Next, as shown in FIG. 9, the fourth modification of the separation preventing means of the present invention will be described. The insertion tube 1 and the receiving tube 2 are detached and inserted into the storage recess 43 e in the separation prevention means 43. Tapered surfaces 60 and 60 'are formed as contact portions of the present invention that are each reduced in diameter in the direction, and have tapered surfaces 70 and 70' that are inclined substantially the same as the tapered surfaces 60 and 60 '. A locking piece 31 is formed.

  As in the above-described embodiment, the tapered surface of the storage recess 43e that is reduced in diameter toward the taper surface 70 of the locking piece 31 that is about to move relative to the insertion tube 1 and the tube 2 in the direction of separation. 60 comes to contact, and the locking piece 31 is pressed in the radial direction of the insertion tube 1. Furthermore, the storage recess 43e is provided with a tapered surface 60 'whose diameter is reduced even in the insertion direction, so that an external force that moves relative to the insertion tube 1 and the reception tube 2 in the insertion direction is applied. At this time, the tapered surface 60 ′ comes into contact with the tapered surface 70 ′ of the locking piece 31 to be moved relative to the insertion direction, and the locking piece 31 is pressed in the radial direction of the insertion tube 1. To come.

  As a result, the taper surface 60 of the storage recess 43e presses the taper surface 70 of the locking piece 31 so that the claw portions 31a and 31a of the locking piece 31 having the same configuration as described above are arranged on the outer periphery of the inlet tube 1. Since the bite further penetrates into the surface 1c, the locking force of the locking piece 31 is improved, and not only the insertion tube 1 and the receiving tube 2 are prevented from being detached, but also the taper of the storage recess 43e. When the surface 60 ′ presses the tapered surface 70 ′ of the locking piece 31, the locking force of the claw portions 31 a and 31 a of the locking piece 31 is similarly improved, and the insertion tube 1 and the receiving tube 2 is prevented from being excessively inserted. As described above, as described in the first embodiment and the first to fourth modifications of the detachment preventing means of the present invention, the storage for storing the locking piece locked to the insertion tube 1 that is one fluid pipe. The recess may be formed in another member supported by the receiving pipe 2 that is the other fluid pipe (see FIGS. 2, 6, 8, and 9), or may be formed in the receiving pipe itself. It does not matter (see FIG. 7). That is, the storage recess formed on the other fluid pipe side of the present invention means a storage recess formed in another member supported by the other fluid pipe or the other fluid pipe itself.

  Next, the separation preventing means according to the second embodiment will be described with reference to FIG. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted.

  The insertion tube 1 is inserted into the receiving tube 2 with the same configuration as that of the above-described embodiment. By tightening the flange 2b extending from the receiving tube 2 and the press ring 5, the insertion tube 1 is inserted. A seal member provided in the circumferential direction is pressed against the outer peripheral surface 1c of the outer peripheral surface 1c, and the gap between the insertion portion 1a and the receiving portion 2a is connected in a sealed manner.

  Between the insertion tube 1 and the receiving tube 2 connected in this manner, a detachment preventing means 4 ′ of the present invention that covers the insertion portion 1 a and the receiving portion 2 a is attached. The detachment preventing means 4 ′ has divided cover portions 4a ′ and 4b ′, and these cover portions 4a ′ and 4b ′ have cover connecting portions 4c and 4c formed at both end portions on the circumferential side. It is formed in a substantially semicircular shape having an annular shape by being connected by connecting members 4d and 4d. Hereinafter, only the cover part 4a 'will be described because the cover parts 4a' and 4b 'have the same configuration.

  As shown in FIG. 10, a storage recess 44e for storing and arranging the locking piece along the circumferential direction of the cover portion 4a ′ is formed on the inner peripheral surface of the cover portion 4a ′ on the side of the insertion tube 1. A plurality (three in this embodiment) are opened toward the outer peripheral surface 1c of the insertion tube 1. Further, the storage recess 44e is formed so that a part thereof overlaps at every overlap width R that is a predetermined interval in the circumferential direction between each of the adjacent storage recesses 44e and the cover portion 4a '. That is, each storage recess 44e overlaps in the front-rear direction when viewed in the tube axis C direction. Further, the storage recess 44e and each of the storage recesses 44e adjacent to each other are arranged so as to overlap each other when viewed in the pipe circumferential direction.

  Thereafter, the locking piece 32 of the present embodiment, which has the same configuration as the locking piece 3 of the above-described embodiment, is stored in each storage recess 44e via the rubber body 11 while being prevented from falling. Next, the cover portions 4a 'and 4b' are connected between the insertion tube 1 and the receiving tube 2 to form a detachment preventing means 4 'that covers the insertion portion 1a and the receiving portion 2a.

  In more detail, when each locking piece 32 is stored in each storage recess 44e described above, the end portions 32b of each locking piece 32 and the end portions 32b ′ are located on the cover portion 4a ′. Further, the end portions 32b of one of the adjacent locking pieces 32 and the end portion 32b ′ of the other locking piece 32 are arranged in the circumferential direction of the cover portion 4a ′. Each of the locking pieces 32 is overlapped in the front-rear direction when viewed in the direction of the tube axis C. That is, the claw portions 32a and 32a of each locking piece 32 are continuous in the circumferential direction when viewed in the tube axis C direction.

  In this way, each of the locking pieces 32 is housed, so that the plurality of locking pieces 32 are arranged so that the ends of the claw portions 32a, 32a of the locking pieces 32 adjacent to each other are circumferentially viewed in the tube axis C direction. It is arranged so as to overlap in the direction.

  Since the claw portions 32a, 32a of the plurality of locking pieces 32 are locked without interruption in the circumferential direction when viewed from the tube axis C direction, not only can the locking force be maintained over the entire circumferential direction of the fluid pipe, The locking force can be further increased where the ends of the claws 32a and 32a overlap.

  The storage recesses 44e are arranged so that the end portions 32b, 32b 'of the adjacent locking pieces 32 are further overlapped in the circumferential direction of the cover portion 4a', and the locking pieces 32 are stored in the respective storage recesses 44e. By doing so, the locking force may be further improved.

  The engaging piece 32 is arranged so that the end 32b of the engaging piece 32 and the end 32b ′ of the adjacent engaging piece 32 are connected to each other so that the engaging piece 32 is continuous in a substantially spiral shape. In addition, the locking force may be improved in the circumferential direction and the tube axis C direction.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the insertion tube 1 and the reception tube 2 are existing fluid tubes embedded in the ground. However, the present invention is not limited to this, and the insertion tube 1 and the reception tube 2 May be embedded after they are connected so as not to be detached by the detachment preventing means of the present invention, or may be embedded in the ground without being buried in the ground.

  In addition, about the quantity of the storage recessed part of this invention, a latching piece, and a press part, it is not restricted to a present Example, What is necessary is just to be provided toward the outer peripheral surface 1c of the inlet tube 1, and the removal prevention of various aspects. Means may be formed.

DESCRIPTION OF SYMBOLS 1 Insertion tube 2 Reception tube 3 Locking piece 3a Claw part 3b Tapered surface 4 Detachment prevention means 4a, 4b Cover part 4a ', 4b' Cover part 4e Storage recessed part 4f Tapered surface (contact part)
7 Pressing bolt (pressing part)
31, 32 Locking piece 32a Claw portion 32b, 32b 'End portion 40, 41, 42 Detachment preventing means 42a, 42b Cover portion 43e, 44e Storage recess 60, 60' Tapered surface (contact portion)
70, 70 'taper surface

Claims (4)

A claw portion that is locked to the outer surface of one fluid pipe, and a plurality of locking pieces arranged along the circumferential direction, and formed on the other fluid pipe side into which the one fluid pipe is fitted. And a detachment preventing means for preventing detachment of the fluid pipes, each of which includes a storage recess in which each locking piece is stored.
The said claw part is formed in the substantially helical shape extended in the pipe-axis direction while extending in the circumferential direction of said one fluid pipe | tube, The removal prevention means characterized by the above-mentioned.   2. The detachment according to claim 1, wherein the plurality of locking pieces are disposed so that ends of the claw portions of the locking pieces adjacent to each other overlap in a circumferential direction when viewed in the tube axis direction. Prevention measures.   The detachment preventing means according to claim 1 or 2, wherein a pressing portion that presses each of the locking pieces in an inner diameter direction of the one fluid pipe is provided in the storage recess.   The storage recess is provided with a contact portion that presses the locking piece in the inner diameter direction of the one fluid pipe by coming into contact with the locking piece that is about to move relatively in the direction in which the fluid pipes are separated from each other. 4. The detachment preventing means according to claim 1, wherein the detachment preventing means is provided.

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