JP2017002996A - Separation prevention mechanism of tubular body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent separation of tubular bodies while securing sufficient strength of the tubular bodies.SOLUTION: A separation prevention mechanism of tubular bodies includes: an insertion-side tubular body 1; a receiving-side tubular body 2 to which the insertion-side tubular body 1 is inserted; an engagement projection 3 disposed on a tip portion of the tubular body of one of the insertion-side tubular body 1 and the receiving-side tubular body 2 in a state of radially projecting to face the mating-side tubular body; a locking member 4 disposed on the other of the insertion-side tubular body 1 and the receiving-side tubular body 2, and brought into contact with the engagement projection 3 when pull-out force acts on both tubular bodies 1, 2; and a watertight member 5 disposed on one of the insertion-side tubular body 1 and the receiving-side tubular body 2 while separating from the locking member 4 at an opposite side in a tubular body axial direction of the engagement projection 3 with respect to the locking member 4 in a state that the tubular bodies 1, 2 are inserted to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tubular body detachment preventing mechanism for securing both tubular bodies while securing a watertight state at the time of connection between an insertion side tubular body and a receiving side tubular body.

  In pipes such as agricultural water and waterworks, a configuration is generally adopted in which an insertion side pipe is inserted into a side pipe and a watertight member is interposed between both pipes. Thus, the watertight member is interposed between the two pipes, thereby preventing water leakage from the gap between the two pipes. In recent years, large-scale earthquakes frequently occur, and when the earthquake shakes on the pipes, there is a problem that both pipes are detached and water leakage occurs. Therefore, there is a case in which a retaining prevention mechanism is employed so that the connected tubular bodies do not come out of each other even when an earthquake shakes on the tubular bodies.

  For example, Patent Document 1 discloses a pipe joint structure in which one pipe having an insertion opening 1 and another pipe having a receiving opening 3 are provided with a protrusion 2 on the outer peripheral surface of the tip. In this pipe joint structure, a water stop rubber ring 4 is disposed between the insertion port 1 and the receiving port 3. A locking piece 5 is attached to the water stop rubber ring 4. Further, a locking piece groove portion 3b with which the locking piece 5 engages is formed on the inner peripheral surface of the receiving port 3, and at a position close to the tube end side of the receiving port 3 of the locking piece groove portion 3b, A water stop rubber ring groove 3a into which the water stop rubber ring 4 is fitted is formed. The insertion port 1 is inserted into the receiving port 3 until the protrusion 2 provided at the insertion port 1 passes through the water stop rubber ring 4. When a pulling force is applied to both tubes in a state where the insertion port 1 is inserted into the receiving port 3, the projecting portion 2 comes into contact with the locking piece groove portion 3b via the locking piece 5, and from the connecting portion of the tube body. In addition to preventing water leakage, separation of the tubes can be prevented (see paragraph 0033 of this document).

JP 2014-142049 A

  In the configuration according to Patent Document 1, since the water stop rubber ring 4 is configured integrally with the locking piece 5, the locking piece 5 is sandwiched between the protrusion 2 and the locking piece groove 3b. In this case, the locking piece is displaced by the sandwiching force, and a load may be applied to the water stop rubber ring 4 in accordance with the displacement. If the water stop rubber ring 4 is deteriorated by cracking or the like due to this load, the water stop effect by the water stop rubber ring 4 is lowered, and there is a possibility of causing a problem of water leakage from the connecting portion of the tubular body. is there.

  Then, this invention makes it a subject to aim at coexistence of the detachment | leave-out of pipes, and the prevention of the water leak from a connection part.

  In order to solve the above problems, in the present invention, an insertion side tube, a receiving side tube into which the insertion side tube is inserted, and a tube on one side of the insertion side tube or the receiving side tube A locking projection provided projecting in a radial direction so as to face the other tube at the tip of the body, and the other tube of the insertion side tube or the receiving side tube; The retaining member that comes into contact with the locking projection when a pulling force is applied to the body, and either the insertion side tube body or the receiving side tube body in the inserted state of both tubes A tubular body detachment preventing mechanism is provided that includes a watertight member provided apart from the retaining member on the opposite side of the retaining protrusion to the tubular member axial direction with respect to the retaining member.

  As described above, when the pulling force is applied to both the tubular bodies, the locking projections and the retaining members are brought into contact with each other, so that the tubular bodies can be reliably prevented from being detached. In addition, since the retaining member and the watertight member are separated from each other, even when the retaining member is engaged with the locking projection and the retaining member is deformed by the pulling force, the influence of the deformation is exerted on the watertight member. Is not enough. For this reason, deterioration, such as a crack, does not occur easily in a watertight member, and it can prevent reliably the water leak from a connection part over a long period of time.

  In the said structure, it is preferable to set it as the structure which the said insertion side pipe body and the said receiving side pipe body consist of a reinforced plastic composite material which compounded fiber reinforced plastic and resin mortar. As described above, by using the reinforced plastic composite material, it is possible to ensure the high strength of the pipe connecting portion, and in addition to the action of preventing the separation of the pipes in the event of a large earthquake, the action of preventing damage is also exhibited. .

  In each of the above configurations, the retaining member may be formed with an opening that opens in the radial direction and the depth direction of the tubular body when no external force is applied to the retaining member. In this way, by forming an opening in the retaining member, when the insertion side tube is inserted into the receiving side tube, the opening is temporarily closed to smoothly connect the two tubes. Can do. In addition, after the pipes are connected to each other, when a pulling force is applied to both the pipes, the retaining member and the locking projection come into contact with each other, and the action of preventing the two pipes from coming off is reliably exhibited.

  In each said structure, the said latching protrusion can be set as the structure which laminated | stacked the metal, the mortar, the resin impregnation fiber, or these, and laminated | stacked these. Thus, by selecting a metal or the like as the material of the locking protrusion, the locking protrusion can be easily formed on the tubular body. In addition, these materials have sufficient strength, and when the retaining member comes into contact with the locking projection, the locking projection is not damaged, and the retaining action of both pipes is reliably exhibited. The

  In each said structure, the said retaining member can be made into an elastic body. Thus, by adopting an elastic body (rubber or the like), the insertion side tube body and the receiving side tube body are smoothly connected, and when a pulling force acts on both the tube bodies, It is possible to prevent an excessive force from acting on the locking protrusions that come into contact with each other, thereby extending the life of the locking protrusions.

  In this invention, an insertion side tube, a receiving side tube into which the insertion side tube is inserted, and a distal end of one side of the insertion side tube or the receiving side tube, A locking projection provided projecting in the radial direction so as to face the tubular body, and provided on the other tubular body of the insertion-side tubular body or the receiving-side tubular body, and when a pulling force acts on both tubular bodies The retaining member that contacts the locking projection, and the engagement member with respect to the retaining member in the inserted state of both tubes on either the insertion-side tube body or the receiving-side tube body. A tubular body detachment preventing mechanism comprising a watertight member provided apart from the retaining member on the opposite side of the stopper projection in the axial direction of the tubular body is configured.

  As described above, when the pulling force is applied to both the tubular bodies, the locking projections and the retaining members are brought into contact with each other, so that the tubular bodies can be reliably prevented from being detached. In addition, since the retaining member and the watertight member are separated from each other, even when the retaining member is engaged with the locking projection and the retaining member is deformed, the influence of the deformation does not reach the watertight member. . For this reason, deterioration, such as a crack, does not occur easily in a watertight member, and it can prevent reliably the water leak from a connection part over a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows 1st embodiment of the removal prevention mechanism of the tubular body concerning this invention, Comprising: (a) is the state before the connection of both tubes, (b) is the state which connected both tubes, c) State in which pulling force is applied to both pipes It is a longitudinal cross-sectional view which shows 2nd embodiment of the detachment | desorption prevention mechanism of the tubular body which concerns on this invention, Comprising: (a) is the state before connection of both tubes, (b) is the state which connected both tubes, c) State in which pulling force is applied to both pipes It is a longitudinal cross-sectional view which shows 3rd embodiment of the detachment | leave prevention mechanism of the tubular body which concerns on this invention, Comprising: (a) is the state before the connection of both tubes, (b) is the state which connected both tubes, c) State in which pulling force is applied to both pipes It is a longitudinal cross-sectional view which shows 4th embodiment of the detachment | desorption prevention mechanism of the tubular body which concerns on this invention, Comprising: (a) is the state before connection of both tubes, (b) is the state which connected both tubes, c) State in which pulling force is applied to both pipes

  A first embodiment of a tubular body separation preventing mechanism according to the present invention is shown in FIGS. This tubular body detachment preventing mechanism is for preventing the insertion side tubular body 1 and the receiving side tubular body 2 connected to each other from coming out of each other due to an earthquake or the like. The tubular body detachment preventing mechanism includes an insertion-side tube body 1, a receiving-side tube body 2 into which the insertion-side tube body 1 is inserted, and a locking protrusion 3 provided at the distal end portion of the outer peripheral surface of the insertion-side tube body 1. And a retaining member 4 provided on the inner peripheral surface of the receiving tube 2 and a watertight member 5 provided at the tip of the inner peripheral surface of the receiving tube 2.

  The insertion-side tube 1 is formed with a step portion 1a that reduces the outer diameter of the tube at the tip, so that the receiving-side tube 2 can be inserted until the tip hits the step 1a. It has become. The insertion side tube 1 and the receiving side tube 2 are both made of a reinforced plastic composite material in which a fiber reinforced plastic and a resin mortar are combined.

  The locking projection 3 has an annular shape, and an inclined surface 3a is formed on the outer diameter side of the insertion tube 1 so as to decrease the thickness in the radial direction toward the distal end of the insertion side tube 1. Further, an abutting wall 3b standing outward in the radial direction is formed. In this way, by forming the inclined surface 3a, the retaining member 4 and the watertight member 5 formed in the receiving tube 2 along the inclined surface 3a are inserted and guided to the back side of the side tube 1, Both tubes 1 and 2 can be smoothly connected. Further, by forming the abutting wall 3b, the retaining member 4 can be abutted against the abutting wall 3b to prevent the tubular bodies 1 and 2 from coming off.

  As a material for the locking projection 3, a laminate in which a plurality of resin-impregnated fibers impregnated with resin is laminated is used. This laminated body can be easily formed on the outer surface of the insertion tube 1. In addition, the laminated body after curing has sufficient strength, and when the retaining member 4 comes into contact with the locking projection 3, the retaining action of both the tubular bodies 1 and 2 is surely exhibited. In this embodiment, a laminated body of resin-impregnated fibers is used as the material of the locking protrusion 3, but metal, mortar, or a laminated body in which these are laminated can also be appropriately adopted. The higher the hardness of the material of the locking projection 3, the better the durability. In this embodiment, the annular locking projection 3 is employed, but the locking projection 3 does not necessarily have an annular shape. For example, a plurality of locking projections 3 formed at a predetermined circumferential angle (for example, 30 degrees) may be arranged in an annular shape with a predetermined angular interval.

  The retaining member 4 has an annular shape, and a rounded portion 4a is formed on the inner diameter side thereof so as to decrease the thickness in the radial direction toward the distal end of the receiving tube 2. In addition, an abutting wall 4b standing inward in the radial direction is formed. Thus, by forming the rounding part 4a, the locking projection 3 can be smoothly guided along the rounding part 4a, and the insertion side tube 1 and the receiving side tube 2 can be easily connected. it can. In addition, even if the abutting wall 4b of the retaining member 4 and the abutting wall 3b of the locking projection 3 abut, and the retaining member 4 is deformed by this abutting force (pulling force), the retaining member 4 is not deformed. And the watertight member 5 can be prevented (see the gap indicated by the symbol g in FIG. 1B). By preventing this contact, it is possible to prevent the watertight member 5 from being deteriorated, such as cracks, and the water leakage preventing action from being lowered. In the first embodiment, the annular retaining member 4 is employed. However, similar to the locking protrusion 3 described above, the ring-shaped retaining member 4 does not necessarily have an annular shape and is provided at the position where the locking protrusion 3 is provided. It can also be set as the structure which provided the retaining member 4 only in the corresponding position.

  Further, an annular protrusion 4 c is formed on the surface of the retaining member 4 facing the inner peripheral surface of the receiving tube 2, and the annular protrusion 4 c is formed on the inner peripheral surface of the receiving tube 2. Is fitted in the circumferential groove 2a. In this way, by fitting the annular protrusion 4c into the circumferential groove 2a, when a pulling force is applied to both the tubular bodies 1 and 2, the retaining member 4 is displaced in the axial direction, so that the tubular bodies 1 and 2 are displaced. It is possible to prevent the effect of preventing the separation between each other from being exhibited. An elastic body (rubber or the like) is adopted as the material of the retaining member 4 and can smoothly connect both the tubular bodies 1 and 2, and when a pulling force acts on both the tubular bodies 1 and 2, It is possible to surely prevent separation. Further, by using the retaining member 4 as an elastic body, an excessive force does not act on the retaining projection 3 that contacts the retaining member 4, and the life of the retaining projection 3 can be extended.

  The watertight member 5 has an annular shape, and two annular protrusions 5a and 5a are formed on the inner diameter side thereof. Each annular protrusion 5a, 5a is formed with an inclined surface 5b that decreases in thickness in the radial direction toward the tip of the receiving tube 2 and rises radially inward at the back end. An upright surface 5c is formed. In this way, when the inclined surface 5b is formed on the distal end side of the receiving-side tubular body 2, the inclined surface 5b is guided to the inclined surface 3a formed on the locking projection 3 when the two tubular bodies 1 and 2 are connected. Therefore, the connection can be performed smoothly.

  At the end of the watertight member 5 on the distal end side of the receiving tube 2, a flange 5 d is formed that rises radially outward. The flange 5d covers the end surface of the receiving-side tube 2. For this reason, when the pipes 1 and 2 are connected, the step 1a of the insertion side pipe 1 and the end of the receiving side pipe 2 are not in direct contact with each other. It is possible to prevent the tubular bodies 1 and 2 from being damaged.

  In addition, two circumferential grooves 5e are formed on the surface of the watertight member 5 facing the inner peripheral surface of the receiving side pipe body 2, and formed on the inner peripheral surface of the receiving side pipe body 2 in the peripheral groove 5e. The annular protrusion 2b is fitted. By fitting the annular protrusion 2b into the circumferential groove 5e in this manner, the watertight member 5 is prevented from being displaced in the axial direction when the pipes 1 and 2 are connected, and the leakage preventing function is reduced. be able to.

  When the pulling force is applied to both the tubular bodies 1 and 2 as shown in FIG. 1 (c) in a state where both the tubular bodies 1 and 2 are connected, the locking projection 3 and the retaining member 4 come into contact with each other. The detachment of the bodies 1 and 2 is prevented.

  2 (a) to 2 (c) show a second embodiment of the tubular body separation preventing mechanism according to the present invention. The tubular body detachment preventing mechanism has the same basic configuration as that of the first embodiment, but an annular projection 3c is formed on the surface of the locking projection 3 facing the outer peripheral surface of the insertion side tubular body 1. This annular protrusion 3c is different in that it is fitted in a circumferential groove 1b formed on the outer peripheral surface of the insertion tube 1. Thus, when the annular protrusion 3c is fitted into the circumferential groove 1b, when a pulling force is applied to both the tubular bodies 1 and 2, the locking projection 3 is displaced in the axial direction, and the tubular bodies 1 and 2 are displaced. It is possible to prevent the effect of preventing the separation between each other from being exhibited.

  3A to 3C show a third embodiment of a tubular body separation preventing mechanism according to the present invention. The tubular body detachment preventing mechanism has the same basic configuration as that according to the first embodiment, but is provided with an inclined surface in place of the retaining member 4 in place of the rounding portion 4a (see FIG. 1A). 4 d is formed, and the opening 4 e that opens in the radial direction and the back direction of the receiving tube 1 is formed when the retaining member 4 is not loaded with an external force. Thus, by forming the opening 4e in the retaining member 4, when the insertion-side tube 1 is inserted into the receiving-side tube 2, the opening 4e is temporarily closed and both the tubes smoothly. The bodies 1 and 2 can be connected. Moreover, after the pipes 1 and 2 are connected to each other, when a pulling force is applied to both the pipes 1 and 2, the retaining member 4 and the locking projection 3 come into contact with each other to prevent the both pipes 1 and 2 from being detached. The effect is reliably exhibited.

  3 (b) and 3 (c) show a state in which the opening 4e is closed in the connected state of the pipes 1 and 2, the outer peripheral surface of the insertion side pipe 1 and the receiving side pipe 2 are shown. It is good also as an aspect in which the opening part 4e opened a little in the connection state of both the tubular bodies 1 and 2 further spaced apart from the inner peripheral surface.

  4 (a) to 4 (c) show a fourth embodiment of the tubular body separation preventing mechanism according to the present invention. The tubular body detachment prevention mechanism has the same basic configuration as that of the first embodiment, but does not form the stepped portion 1a (see FIG. 1 (a), etc.) of the insertion side tubular body 1. It is different in point. Thus, by not forming the step portion 1a, the processing cost of the insertion side tube 1 can be reduced, and the degree of freedom of the insertion depth of the insertion side tube 1 into the receiving side tube 2 can be improved. it can.

  The detachment prevention mechanism and the detachment prevention member for the pipe bodies 1 and 2 described in each of the above embodiments are merely examples, and the invention of the present application aims to achieve both prevention of detachment of the pipe bodies and prevention of water leakage from the connecting portion. As long as the above problem can be solved, the shape, arrangement, number, and the like of the constituent members can be appropriately changed. For example, the retaining member 4 may be provided on the insertion side tube 1, the locking projection 3 may be provided on the receiving side tube 2, and the watertight member 5 may be provided on the insertion side tube 1.

DESCRIPTION OF SYMBOLS 1 Insertion side pipe body 1a Step part 1b Circumferential groove 2 Reception side pipe body 2a Circumferential groove 2b Annular protrusion 3 Locking protrusion 3a Inclined surface 3b Contact wall 3c Annular protrusion 4 Retaining member 4a Rounding part 4b 4c annular protrusion 4d inclined surface 4e opening 5 watertight member 5a annular protrusion 5b inclined surface 5c upright surface 5d flange 5e circumferential groove g gap

Claims (5)

Insertion side tube (1),
A receiving tube (2) into which the insertion tube (1) is inserted;
A locking projection (3) provided to project radially from the distal end of one of the insertion-side tube (1) or the receiving-side tube (2) so as to face the mating tube. When,
Of the insertion side tube (1) or the receiving side tube (2), it is provided on the other tube, and when the pulling force acts on both tubes (1, 2), the locking projection (3 And a retaining member (4) in contact with
With respect to the retaining member (4) in the inserted state of both tubes (1, 2) on either the insertion side tube (1) or the receiving side tube (2), A watertight member (5) provided on the opposite side of the locking projection (3) in the axial direction of the tubular body and spaced from the retaining member (4);
A tube body detachment prevention mechanism with   The tubular body detachment preventing mechanism according to claim 1, wherein the insertion side tubular body (1) and the receiving side tubular body (2) are made of a reinforced plastic composite material in which a fiber reinforced plastic and a resin mortar are combined.   The opening part (4e) which opens to the radial direction and the back direction of a pipe body when the external force is not applied to the retaining member (4) is formed in the retaining member (4). Tube body separation prevention mechanism.   The tubular body detachment preventing mechanism according to any one of claims 1 to 3, wherein the locking protrusion (3) is formed by laminating a metal, a mortar, a resin-impregnated fiber, or a laminate thereof.   The tubular body detachment prevention mechanism according to any one of claims 1 to 4, wherein the retaining member (4) is an elastic body.

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