JP2018009616A - Separation prevention device of fluid pipe and separation prevention method of fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separation prevention device of a fluid pipe capable of securing separation prevention function while reducing a cost, and to provide a separation prevention method of the fluid pipe using the separation prevention device of the fluid pipe.SOLUTION: A restraint member 32 includes: an inclined plane 32a of which an outer diameter is changed along a pipe axial direction; a front claw 32b formed on the front side to which the outer diameter of the inclined plane 32a gets to larger; and a rear claw 32c formed on the rear side to which the outer diameter of the inclined plane 32a gets to smaller. A storage groove 33 of a housing 30 has a first bottom plane 33a of which the size is enlarged toward the front side and a second bottom plane 33b formed on the front side of the first bottom plane 33a. The second bottom plane 33b is extended in parallel to the pipe axial direction. The first bottom plane 33a is abutted on the rear side of the inclined plane 32a, at the same time, the first bottom plane 33a is gradually separated from the inclined plane 32a toward the front side, and the front claw 32b and the rear claw 32c are evenly protruded from the storage groove 33 while the second bottom plane 33b is abutted on the front side of the inclined plane 32a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fluid pipe detachment prevention device and a fluid pipe detachment prevention method using the same.

  In a connection place of a fluid pipe such as a water pipe, a detachment prevention device may be used for a pipe joint formed by inserting an insertion opening of the other pipe into a receiving opening of one pipe. Such a fluid pipe detachment preventing device is applied to, for example, a push ring in a mechanical type pipe joint, a pipe opening in a slip-on type pipe joint, and a reinforcing fitting attached to an existing pipe joint.

  Patent Document 1 describes a push ring in which a plurality of locking members are housed in housing grooves formed in an annular housing, and each of which is provided with a push bolt that is a pressing member. According to such a configuration, it is possible to prevent each of the locking members from being locked to the outer peripheral surface of the insertion port by operating the push bolt, and the insertion port from being detached from the receiving port. In addition, when the push bolt presses the inclined surface of the locking member, an external force in the tube axis direction (hereinafter referred to as a pulling force) that causes the insertion port to be detached from the receiving port is applied, so that the locking member is inserted by the wedge effect. It is strongly pressed toward the outer peripheral surface of the mouth and can exhibit an excellent separation preventing function.

  Conventionally, since each of the plurality of locking members is provided with a pressing member, the same number of pressing members as the locking members are necessary, and a mounting hole for inserting them must be formed in the housing. In other words, the cost tends to increase. In particular, when the housing is formed of an undivided annular body, the diameter of the housing itself cannot be reduced. Therefore, it has been considered that a pressing member is indispensable for locking the locking member to the outer peripheral surface of the insertion opening.

  Moreover, in the structure which has the said wedge effect, when the pulling force acts, the force of the direction of rotation acts on a locking member, and the nail | claw (front) which the outer diameter of an inclined surface becomes large becomes large. Nail) tends to be pressed more strongly than the nail (rear nail) formed on the rear side. Therefore, the load is biased to the front claws, the front claws bite into the tube excessively, and the front claws and the rear claws do not bite evenly, and there is a possibility that the separation preventing function is not fully exhibited. This problem is pointed out in Patent Document 2 by the present applicant, and as a solution to this problem, a structure in which a pressing surface that presses the inclined surface of the locking member is inclined is proposed by the present inventor. Yes.

  Therefore, the present inventor has a structure in which the pressing member is omitted from some locking members and the pressing surface is inclined with respect to the inclined surface of the locking member in order to realize cost reduction and securing of the separation preventing function. I came up with it. FIG. 13 is an example thereof, and the inclined surface 8 a of the locking member 8 not provided with the pressing member is configured to be pressed by the bottom surface 91 of the housing groove 9. The bottom surface 91 that is a pressing surface is inclined with respect to the inclined surface 8a so that the load is not biased to the front claw 8b when the pulling force is applied. However, with this configuration, it has been found that when the outer peripheral surface of the insertion slot 2 comes into contact with the claws 8b and 8c, the locking member 8 tends to be inclined as shown in FIG.

  In the state of FIG. 14, the locking member 8 is greatly inclined so that the front claw 8 b is separated from the outer peripheral surface of the insertion opening 2, and not only the front claw 8 b is not locked but also the rear claw 8 c is along the circumferential direction. Since it does not lock evenly, the function of preventing separation cannot be sufficiently exhibited. The locking member provided with the pressing member is unlikely to be in such a tilted state, and even if tilted, it can be corrected to an appropriate posture by operating the pressing member. However, such a countermeasure cannot be performed by the locking member 8 in which such a pressing member is omitted.

  Patent Document 3 describes a push wheel in which the pressing member is omitted in some of the plurality of locking members, but does not employ a structure in which the pressing surface is inclined with respect to the inclined surface of the locking member. As for the problems caused by the inclination of the locking member as described above, no solution is suggested.

JP 2013-167329 A JP 2012-215266 A Japanese Utility Model Publication No. 55-31338

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fluid pipe detachment prevention device capable of ensuring a detachment prevention function while reducing costs, and a fluid pipe detachment prevention method using the same. There is.

  The above object can be achieved by the present invention as described below. That is, the fluid pipe detachment preventing device according to the present invention is a fluid pipe detachment preventing apparatus used for a pipe joint formed by inserting an insertion port of the other pipe into a receiving port of one pipe. A housing that is formed separately or integrally, and is fitted over the insertion port, a plurality of locking members that are locked to the outer peripheral surface of the insertion port, and toward the outer peripheral surface of the insertion port And an accommodating groove that accommodates the plurality of locking members, and the locking member has an inclined surface whose outer diameter changes along the tube axis direction, and an outer diameter of the inclined surface is increased. A front claw formed on the front side, a rear claw formed on the rear side where the outer diameter of the inclined surface is reduced, and the housing groove has a first bottom surface that is increased in diameter toward the front side; A second bottom surface formed on the front side of the first bottom surface, the second bottom surface extending in parallel with the tube axis direction, Alternatively, the diameter is reduced toward the front side, or the diameter is increased toward the front side at an inclination angle smaller than that of the first bottom surface, and the first bottom surface is in contact with the rear side of the inclined surface. When the first bottom surface is gradually separated from the inclined surface toward the front side, and the second bottom surface is in contact with the front side of the inclined surface, the front and back claws are It is comprised so that it may protrude evenly.

  In this device, since the front and rear claws of the locking member protrude from the receiving groove with the bottom surface of the receiving groove in contact with the inclined surface of the locking member, it is necessary to provide a pressing member such as a push bolt. There is no. Therefore, the number of pressing members can be reduced as compared with the prior art, and processing for forming the mounting hole in the housing can be reduced, which contributes to cost reduction. In addition, by bringing the bottom surface of the receiving groove into contact with the inclined surface of the locking member as described above, the locking member is prevented from being inclined (see FIG. 14), and when a pulling force is applied, While exhibiting the wedge effect, the front claw and the back claw can be bitten evenly without the load being biased to the front claw, and the separation preventing function can be secured.

  The plurality of locking members include a first locking member provided with a pressing member inserted through an attachment hole of the housing and a second locking member not provided with the pressing member, The first locking member can be moved in the pipe diameter direction by operating the member, and the first bottom surface and the second bottom surface are provided at the location of the second locking member in the receiving groove. Is preferred. In this case, since the pressing member is provided in the first locking member, the first locking member moved toward the insertion port by operating the pressing member can be locked to the outer peripheral surface of the insertion port. Although the second locking member is not provided with a pressing member, the front claw and the rear claw protrude evenly from the receiving groove in a state where the first bottom surface and the second bottom surface are in contact with the inclined surface. The two locking members can be locked to the outer peripheral surface of the insertion slot.

  Since the housing which consists of an undivided annular body cannot reduce the diameter of the housing itself, normally, a pressing member is provided on each of the plurality of locking members. However, according to the fluid pipe detachment preventing device of the present invention, the front and rear claws protrude evenly from the receiving groove in a state where the first bottom surface and the second bottom surface are in contact with the inclined surface of the locking member. Therefore, there is no problem even if the housing is made of an undivided annular body.

  A plurality of through holes extending in the tube axis direction may be formed at a plurality of locations in the tube circumferential direction on the outer peripheral surface of the housing, and the total number of the plurality of locking members may be smaller than the number of the through holes. Usually, since a locking member is provided between a pair of through holes adjacent in the circumferential direction, the number of locking members is the same as the number of through holes. On the other hand, according to the said structure, a number of parts can be reduced regarding a locking member.

  Further, the fluid pipe detachment preventing method according to the present invention includes a housing formed of an annular body that is formed separately from or integrally with the receiving port by inserting the inserting port of the other tube into the receiving port of one tube. An outer fitting step of fitting the insertion member into the insertion port, and a locking step of engaging a plurality of locking members accommodated in the accommodation groove opened toward the outer circumferential surface of the insertion port with the outer circumferential surface of the insertion port. The locking member includes an inclined surface whose outer diameter changes along the tube axis direction, a front claw formed on the front side where the outer diameter of the inclined surface increases, and an outer diameter of the inclined surface A rear claw formed on the rear side of the first bottom surface, and the receiving groove has a first bottom surface whose diameter increases toward the front side, and a second bottom surface formed on the front side of the first bottom surface. And in the locking step, the first bottom surface is moved forward while the first bottom surface is brought into contact with the rear side of the inclined surface. The front claw and the rear claw protruded from the receiving groove are separated from the inclined surface and the second bottom surface is in contact with the front side of the inclined surface, respectively, and the outer peripheral surface of the insertion port. Is to be locked.

  In this method, since the front and rear claws of the locking member protrude from the receiving groove in a state where the bottom surface of the receiving groove is in contact with the inclined surface of the locking member, it is necessary to provide a pressing member such as a push bolt. There is no. Therefore, the number of pressing members can be reduced as compared with the prior art, and processing for forming the mounting hole in the housing can be reduced, which contributes to cost reduction. In addition, by bringing the bottom surface of the receiving groove into contact with the inclined surface of the locking member as described above, the locking member is prevented from being inclined (see FIG. 14), and when a pulling force is applied, While exhibiting the wedge effect, the front claw and the back claw can be bitten evenly without the load being biased to the front claw, and the separation preventing function can be secured.

The front view of the press ring which is an example of the movement prevention apparatus of the fluid pipe | tube which concerns on this invention AA sectional view of the press ring in FIG. BB sectional view of the press ring in FIG. CC sectional view of the press ring in FIG. Cross-sectional view of the press ring before installation Sectional drawing for demonstrating an external fitting process Sectional drawing for demonstrating a sealing process Cross section of push ring when using sheet material Sectional drawing which shows the other shape of the bottom face of a storage groove Sectional drawing which shows the other shape of the bottom face of a storage groove Front view of push wheel according to another embodiment The half sectional view of the reinforcement metal fitting which is an example of the movement prevention device of the fluid pipe concerning the present invention Sectional drawing for demonstrating the conventional structure which inclined the pressing surface with respect to the inclined surface of a locking member Sectional drawing for demonstrating the malfunction by the structure of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show an example in which a fluid pipe detachment preventing device according to the present invention is applied to a push ring. The pusher wheel 3 is used for a pipe joint formed by inserting the insertion port 2 of the other pipe P2 into the receiving port 1 of the one pipe P1. Each of the pipes P1 and P2 is a ductile cast iron pipe for waterworks buried in the ground. However, it is not restricted to this, For example, a steel pipe, a vinyl chloride pipe, a polyethylene pipe, a polyolefin pipe, and other fluid pipes may be used. The fluid flowing inside the pipes P1 and P2 is not limited to clean water, but may be industrial water, sewage, gas, a gas-liquid mixture of gas and liquid, or the like.

  Between the receiving port 1 and the insertion port 2 inserted in it, the cyclic | annular sealing material 4 which seals those clearance gaps is arrange | positioned. The end portion of the receiving port 1 is formed with a diameter-enlarged portion 1a that expands toward the end surface, and a flange portion 1b that extends outward in the tube diameter direction, and the sealing material 4 is pushed into the enlarged-diameter portion 1a. ing. The pusher wheel 3 presses the sealing material 4 in the tube axis direction and pushes it into the enlarged diameter portion 1a, thereby ensuring a sealed state.

  The push ring 3 includes a housing 30 that is externally fitted to the insertion slot 2, a plurality of locking members that are locked to the outer peripheral surface of the insertion slot 2, and an accommodation groove 33 that accommodates the plurality of locking members. The housing 30 is formed of a non-divided annular body formed separately from the receiving port 1 and is integrally provided continuously in the pipe circumferential direction. The inner diameter of the housing 30 is larger than the outer diameter of the insertion slot 2 (the outer diameter of the pipe P2), and the tips (front claws and rear claws) of the locking members protruding from the receiving grooves 33 are locked to the outer peripheral surface of the insertion slot 2. doing. In the present embodiment, an example is shown in which the plurality of locking members include a first locking member 31 provided with a push bolt 34 and a second locking member 32 provided with no push bolt 34.

  On the outer peripheral surface of the housing 30, through holes 35 extending in the tube axis direction are formed at a plurality of locations (four locations in the example of FIG. 1) in the tube circumferential direction. As shown in FIG. 4, a fastener 36 composed of a bolt and a nut is attached to the through hole 35 and the through hole of the flange portion 1b. As a result, the pusher wheel 3 is fixed to the receiving port 1 and the centering (centering) of the pusher wheel 3 with respect to the receiving port 1 is performed. In addition, the seal member 4 can be pressed by operating the fastener 36 and moving the pusher wheel 3 toward the receiving port 1.

  The housing groove 33 opens toward the outer peripheral surface of the insertion slot 2 and is formed on the inner peripheral surface of the housing 30. The housing groove 33 is formed as an annular groove continuously extending in the pipe circumferential direction, but a plurality of arc-shaped housing grooves may be formed intermittently. As shown in FIGS. 1 and 2, in the place where the first locking member 31 is disposed, an attachment hole is provided so as to penetrate the bottom surface of the accommodation groove 33, and a push bolt 34 as a pressing member is provided in the attachment hole. It is inserted. In addition, as shown in FIGS. 1 and 3, such a mounting hole is not provided at the place where the second locking member 32 is disposed.

  The pusher wheel 3 includes a plurality of (four in the example of FIG. 1) locking members including a first locking member 31 and a second locking member 32, and these are arranged in a pipe circumferential direction. It is accommodated in the accommodation groove 33. In the present embodiment, the total number of the plurality of locking members is 4, two of which are the first locking members 31 and the remaining two are the second locking members 32. The first locking member 31 is disposed on the upper side, and the second locking member 32 is disposed on the lower side. Each of these locking members is locked to the outer peripheral surface of the insertion slot 2, thereby preventing the insertion slot 2 from being detached from the receiving slot 1.

  The second locking member 32 includes an inclined surface 32a whose outer diameter changes along the tube axis direction, and a front claw 32b formed on the front side (right side in FIG. 3) where the outer diameter of the inclined surface 32a increases. The rear claw 32c is formed on the rear side (left side in FIG. 3) where the outer diameter of the inclined surface 32a is reduced. The inclined surface 32 a is formed by a flat surface and is inclined in a direction in which the diameter increases toward the receiving port 1. The front claw 32b and the rear claw 32c are arranged with a space therebetween in the tube axis direction, and each of them is curved with the same curvature as that of the outer peripheral surface of the insertion slot 2, and has a triangular cross section, thereby forming the second locking member 32. It protrudes on the inner peripheral surface of.

  Similarly, the 1st latching member 31 has the inclined surface 31a, the front nail | claw 31b, and the back nail | claw 31c. The first locking member 31 is composed of the same member as the second locking member 32, and they are only different in the mode of combination with the housing 30. The push bolt 34 is provided only on the first locking member 31, and the first locking member 31 can be moved in the pipe diameter direction by operating this. The first locking member 31 and the second locking member 32 are both made of a robust material such as metal, and specifically, cast iron is exemplified.

  As shown in FIG. 2, the end surface of the push bolt 34 inclined in the same direction is in contact with the inclined surface 31 a of the first locking member 31. When an external force in the tube axis direction (hereinafter referred to as a pulling force) that causes the insertion port 2 to be detached from the receiving port 1 is applied, the first locking member 31 is strongly pressed toward the outer peripheral surface of the insertion port 2 by the wedge effect, and is detached. The prevention function is enhanced. Further, the end surface of the push bolt 34 is inclined with respect to the inclined surface 31a so that the load is not biased to the front claw 31b when the pulling force is applied. The end surface of the push bolt 34 is gradually separated from the inclined surface 31a toward the front side while the end surface thereof is in contact (line contact) with the rear side of the inclined surface 31a.

  As shown in FIG. 3, the bottom surface of the accommodation groove 33 is in contact with the inclined surface 32 a of the second locking member 32. The second locking member 32 is held in the receiving groove 33 with the front claw 32 b and the rear claw 32 c protruding from the receiving groove 33. As described above, in the pusher wheel 3, the push bolt 34 is not provided on the second locking member 32. Therefore, in the prior art, the same number of push bolts as the locking members are required, whereas in the pusher wheel 3, the number of push bolts 34 is smaller than the number of the locking members. Further, in the place where the second locking member 32 is provided, no mounting hole for inserting the push bolt 34 is provided, and the formation of the mounting hole is omitted. Since the formation of the mounting hole, which is a screw hole, requires drilling and tapping, the effect of cost reduction by omitting this is great.

  The housing groove 33 has a first bottom surface 33a having a diameter that increases toward the front side, and a second bottom surface 33b formed on the front side of the first bottom surface 33a, which are in contact with the inclined surface 32a. That is, the first bottom surface 33 a and the second bottom surface 33 b are provided at the location where the second locking member 32 is disposed in the accommodation groove 33. The second bottom surface 33b extends in parallel with the tube axis direction. However, the second bottom surface 33b decreases in diameter toward the front side, or expands toward the front side at an inclination angle (angle with respect to the tube axis direction) smaller than that of the first bottom surface 33a. It does not matter if it has a diameter. In any case, it is preferable that the first bottom surface 33a and the second bottom surface 33b have an obtuse angle and the bottom surface of the housing groove 33 is bent as a whole.

  In the pusher wheel 3, the first bottom surface 33a is in contact with the rear side of the inclined surface 32a, the first bottom surface 33a is gradually separated from the inclined surface 32a toward the front side, and the second bottom surface 33b is disposed on the front side of the inclined surface 32a. The front claw 32b and the rear claw 32c are configured to protrude evenly from the receiving groove 33 in a state where the abutment is in contact. Here, “the front and rear claws project evenly” means that the projections (positions in the pipe diameter direction) of the respective claws are substantially the same, and there is no problem in locking them together. This includes a case where a slight difference in protrusion (for example, 1 mm or less, preferably 0.5 mm or less) is caused.

  In this configuration, since the second bottom surface 33b is in contact with the front side of the inclined surface 32a, when the outer peripheral surface of the insertion port 2 is brought into contact with the front claw 32b and the rear claw 32c, the second locking member 32 is It does not enter a tilted state (see FIG. 14). Moreover, since the first bottom surface 33a is in contact with the rear side of the inclined surface 32a as described above, when the pulling force is applied, a wedge effect is produced, and the load is not biased to the front claw 32b. 32b and the back nail | claw 32c can be made to bite equally, and the outstanding removal prevention function can be ensured.

  The inclination angle θ of the first bottom surface 33a with respect to the inclined surface 32a is preferably 1 ° or more, more preferably 2 ° or more, and 3 ° to prevent the load from being biased to the front claw 32b when a pulling force is applied. The above is more preferable. In addition, the inclination angle θ is preferably 5 degrees or less, more preferably less than 5 degrees, and still more preferably 4 degrees or less from the viewpoint of appropriately pressing the second locking member 32 toward the insertion opening 2. As described above, the inclination angle θ is preferably 1 to 5 degrees.

  The first bottom surface 33a is in contact (line contact) with the rear edge of the inclined surface 32a. These contact points are preferably located on the rear side of the rear claw 32c, so that the pressure in the tube radial direction by the first bottom surface 33a is preferentially transmitted to the rear claw 32c, and the rear claw 32c is pressed more strongly than the front claw 32b. As a result, when a pulling force is applied, a state in which the load is not biased to the front claw 32b is appropriately obtained, and the front claw 32b and the rear claw 32c can be bitten into the outer peripheral surface of the insertion opening 2 in a balanced manner. .

  A movement allowance is provided in the accommodation groove 33 so that each locking member can move in the tube axis direction. Such movement allowance is useful for developing the wedge effect. Further, the front claw 32 b and the rear claw 32 c are configured to always protrude from the accommodation groove 33 regardless of the position of the second locking member 32 in the accommodation groove 33. Thereby, the 2nd latching member 32 is latched appropriately to the outer peripheral surface of the insertion port 2, and the separation prevention function can be secured satisfactorily. When the second locking member 32 moves rearward, the rear claw 32c further protrudes due to the wedge effect on the first bottom surface 33a, but the front claw 32b does not protrude excessively due to the second bottom surface 33b as described above. The front claws 32b and the rear claws 32c bite evenly with good balance. Although not shown in the drawing, an elastic material for preventing the locking member from falling off is interposed between the side surface of each locking member and the wall surface of the receiving groove 33, and they are compressed and deformed. Can move to.

  Where the first locking member 31 is provided with the push bolt 34, the second locking member 32 is not provided with the push bolt 34 although the outer diameter of the housing 30 needs to be relatively large. Then, the outer diameter of the housing 30 can be made relatively small. Thus, in the setting location of the 2nd locking member 32, compared with the setting location of the 1st locking member 31, the outer diameter of the housing 30 is made small, and the volume of the housing 30 is reduced by that much and the cost reduction is aimed at. be able to.

  In this embodiment, as shown in FIGS. 1 and 4, the tip of the first locking member 31 or the second locking member 32 and another first locking member 31 or the second locking member 32 adjacent to the tip of the first locking member 31 or the second locking member 32. The tip ends overlap each other in the tube axis direction, and the region where the locking member contacts the outer peripheral surface of the insertion slot 2 is configured to be continuous in the tube circumferential direction. The structure of such a locking member is disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-309186 by the present applicant. However, the present invention is not limited to this.

  When the first locking member 31 and the second locking member 32 are mixed as in the present embodiment, the total number of the plurality of locking members is 4 or more, and one or two of them is the second locking member 32. It is preferable to make it. Thereby, the ratio of the 2nd latching member 32 is moderately suppressed, and the contact balance of each latching member with respect to the outer peripheral surface of the insertion port 2 becomes favorable. In particular, when the housing 30 is formed of a non-divided annular body, if the number of the second locking members 32 increases, it becomes difficult for the locking members to come into contact with each other in a balanced manner. . In addition, when there are a plurality of second locking members 32, they are preferably arranged adjacent to each other.

  A method for preventing separation of the fluid pipe using the pusher 3 will be described. The pusher wheel 3 in FIG. 5 shows an initial state such as when shipping and transporting or when an external fitting operation is started, and the housing 30 has not yet been externally fitted to the insertion slot 2. The second locking member 32 is held in the receiving groove 33 via the elastic material with the front claw 32b and the rear claw 32c protruding. First, the housing 30 is externally fitted to the insertion slot 2 as shown in FIG. Next, as shown in FIG. 7, the sealing material 4 interposed in the gap between the receiving port 1 and the insertion port 2 is pressed into a sealed state, and the pusher wheel 3 is fixed to the receiving port 1 (sealing process). And each locking member is locked to the outer peripheral surface of the insertion port 2, as shown in FIGS.

  In the external fitting process, the second locking member 32 is disposed downward while the first locking member 31 is disposed upward (see FIG. 1). Then, the housing 30, which is eccentric downward with respect to the insertion slot 2 without protruding the tip end of the first locking member 31 disposed above from the housing groove 33, is fitted onto the insertion slot 2. At this time, by depositing the pusher wheel 3 in the insertion port 2 with the tube axis direction oriented in the horizontal direction, the center of the housing 30 can be positioned below the center of the insertion port 2 by the weight of the pusher wheel 3. Since the outer peripheral surface of the insertion port 2 is coated with anticorrosion paint or the like, it is useful to prevent the outer peripheral surface of the insertion port 2 from being damaged in this way.

  FIG. 8 shows an example in which the second locking member 32 before being locked to the outer peripheral surface of the insertion slot 2 is covered with the sheet material 5. The sheet material 5 is provided only on the second locking member 32 of the first locking member 31 and the second locking member 32, and is disposed so as to close the opening of the accommodation groove 33. In the outer fitting step, the second locking member 32 is covered with the sheet material 5 in this way, so that the front claw 32b and the rear claw 32c can be more reliably prevented from damaging the outer peripheral surface of the insertion slot 2. However, the use of the sheet material 5 is not essential. The sheet material 5 is preferably made of a soft material having weather resistance.

  In the sealing step, the fastener 36 is attached to the flange portion 1b and the housing 30, and then the pusher wheel 3 is moved close to the receiving port 1 by operating the fastener 36 to press the sealing material 4. By mounting the fastener 36, the receiving port 1 and the pusher wheel 3 are centered, and the centering is also performed on the insertion port 2 inserted in the receiving port 1. Accordingly, the front claw 32b and the rear claw 32c of the second locking member 32 protruding from the accommodation groove 33 are locked to the outer peripheral surface of the insertion opening 2, respectively. When the sheet material 5 is used, the sheet material 5 is cut by the engagement of the front claws 32b and the rear claws 32c.

  In the locking step, the first bottom surface 33a is gradually separated from the inclined surface 32a toward the front side while the first bottom surface 33a is brought into contact with the rear side of the inclined surface 32a, and the second bottom surface 33b is formed on the inclined surface 32a. The front claw 32b and the rear claw 32c projected from the housing groove 33 are engaged with the outer peripheral surface of the insertion opening 2 in a state where they are in contact with the front side. Thereby, when the outer peripheral surface of the insertion port 2 comes into contact with the front claw 32b and the rear claw 32c, the second locking member 32 is not inclined (see FIG. 14).

  Further, by moving the first locking member 31 toward the insertion slot 2 by operating the push bolt 34, the front claw 31 b and the rear claw 31 c are respectively locked to the outer peripheral surface of the insertion slot 2. In the present embodiment, the first locking members 31 are disposed only on the half circumference (upper half circumference) of the housing 30, and two or three (two in this embodiment) are provided on the remaining half circumference (lower half circumference) of the housing 30. Since the second locking member 32 is arranged, the operation of the push bolt 34 can be made unnecessary on the half circumference of the housing 30. By eliminating the operation of the push bolt 34 below, the operation is simplified as compared with the conventional case, which is particularly useful for construction in the excavation groove.

  In the present embodiment, since the second bottom surface 33b extends parallel to the tube axis direction, the posture of the second locking member 32 can be easily stabilized, and the locking by the rear claw 32c is strengthened when a pulling force is applied. It is done. In the shape in which the second bottom surface 33b is reduced in diameter toward the front side as shown in FIG. 9, the locking by the rear claw 32c is further strengthened. In the shape in which the second bottom surface 33b has a diameter that increases toward the front side at an inclination angle smaller than that of the first bottom surface 33a as shown in FIG. 10, the locking by the front claw 32b is effective, although not as much as the rear claw 32c. Thus, by adjusting the angle of the second bottom surface 33b, the balance of locking of the front claw 32b and the rear claw 32c can be adjusted.

  The push ring shown in FIG. 11 has the same configuration as the push ring 3 described above, except for the structure related to the locking member and the push bolt. In these push wheels, through holes extending in the tube axis direction are formed at a plurality of locations (six locations in the present embodiment) in the tube circumferential direction on the outer peripheral surface of the housing, and a plurality of locking members are provided. The total number is less than the number of through holes. Further, the locking member and the locking member adjacent to the locking member are arranged so that their tips overlap each other in the tube axis direction.

  In the example of (a), the number of locking members is different between the half circumference (upper half circumference) and the remaining half circumference (lower half circumference) of the housing, and the lengths of the first locking member and the second locking member are also different. Yes. The number of through-holes is six, and originally, it has a structure in which six locking members are arranged, but the number of parts is reduced compared to the conventional case by using a second locking member that is long in the circumferential direction. is made of. In the example of (b), in the structure of (a), the first locking member disposed on the upper half circumference is also formed long in order to further reduce the number of parts. Moreover, the attachment hole is provided near the through-hole to which a fastener is mounted | worn so that the center part of a 1st latching member can be pressed with a push bolt. In this configuration, since the lengths of the respective locking members are uniform, the load balance is better than that of the structure (a). In the example of (c), the structure of (b) is further modified, and two push bolts are provided for one first locking member. Compared to the structure of (b) above, the cost reduction effect is inferior, but the strength is excellent because there are many places supporting the load.

  The push wheel shown in FIG. 11 is also configured so that the bottom surface of the receiving groove is brought into contact with the inclined surface of the locking member in the same manner as described above, so that the advantageous effects described above can be obtained.

  FIG. 12 shows an example in which the fluid pipe detachment preventing device according to the present invention is applied to a reinforcing metal fitting. Other than the configuration described below, the configuration can be the same as in the embodiment of the push wheel described above. The reinforcing metal fitting 6 is used for a pipe joint in which the insertion port of the other tube P4 is inserted into the reception port of the one tube P3, and prevents the insertion port from being detached from the reception port. A space between the receiving port and the insertion port is sealed with a sealing material 40. The housing 60 is composed of a divided annular body formed separately from the receiving port of the pipe P3, and is configured to be externally fitted to the insertion port of the pipe P4 in the existing pipe joint. This pipe joint is a slip-on type, but may be a mechanical type.

  The bottom surface of the housing groove 63 of the housing 60 and the structure of the locking member 72 housed in the housing groove 63 are the same as those of the push wheel 3 described above. That is, the first bottom surface 63a is in contact with the rear side of the inclined surface 72a, the first bottom surface 63a is gradually separated from the inclined surface 72a toward the front side, and the second bottom surface 63b is in contact with the front side of the inclined surface 72a. The front claw 72b and the rear claw 72c are configured to protrude evenly from the receiving groove 63 in the state of contact. With this configuration, the advantageous effects described above can be achieved.

  The housing 60 has a split structure (for example, a split structure) having split portions at a plurality of locations in the pipe circumferential direction, and the split portions are connected by a connector (not shown). Since the diameter of the housing 60 can be reduced by tightening the connector, all the locking members accommodated in the accommodation groove 63 may be locking members not provided with the pressing member. That is, the plurality of locking members housed in the housing groove 63 may be configured only by the locking members 72 that are pressed by the bottom surface of the housing groove 63 instead of the push bolt as shown in FIG.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. The number of locking members and push bolts are used and conditions for use. It can be changed appropriately according to the situation.

  In the above-described embodiment, an example in which the fluid pipe detachment prevention device is applied to a press ring or a reinforcing bracket has been described. However, the present invention is not limited thereto, and may be applied to, for example, a pipe receiving port in a slip-on type pipe joint. Is also possible. In this case, the housing is made of a non-divided annular body formed integrally with the receiving port, and a plurality of locking members are accommodated in an accommodation groove formed on the inner peripheral surface thereof.

1 Receiving port 2 Inserting port 3 Press wheel (an example of a separation prevention device)
4 Sealing material 5 Sheet material 6 Reinforcing bracket (an example of an anti-detachment device)
30 Housing 31 Locking member (first locking member)
32 Locking member (second locking member)
32a Inclined surface 32b Front claw 32c Back claw 33 Housing groove 33a First bottom surface 33b Second bottom surface 34 Press bolt (pressing member)
60 Housing 63 Housing groove 63a First bottom surface 63b Second bottom surface 72 Locking member 72a Inclined surface 72b Front claw 72c Rear claw P1 Pipe P2 Pipe

Claims (5)

In the fluid pipe detachment preventing device used for the pipe joint formed by inserting the insertion opening of the other pipe into the receiving opening of one pipe,
A housing formed of an annular body formed separately or integrally with the receiving port, and fitted over the insertion port;
A plurality of locking members locked to the outer peripheral surface of the insertion opening;
An opening that opens toward the outer peripheral surface of the insertion port, and a housing groove that houses the plurality of locking members,
The locking member includes an inclined surface whose outer diameter changes along the tube axis direction, a front claw formed on the front side in which the outer diameter of the inclined surface increases, and a rear in which the outer diameter of the inclined surface decreases. Having a rear nail formed on the side,
The housing groove has a first bottom surface that is expanded toward the front side, and a second bottom surface formed on the front side of the first bottom surface,
The second bottom surface extends in parallel with the tube axis direction, or is reduced in diameter toward the front side, or is expanded in diameter toward the front side with a smaller inclination angle than the first bottom surface,
While the first bottom surface is in contact with the rear side of the inclined surface, the first bottom surface is gradually separated from the inclined surface toward the front side, and the second bottom surface is in contact with the front side of the inclined surface. The fluid pipe detachment preventing device according to claim 1, wherein the front claw and the rear claw protrude evenly from the receiving groove. The plurality of locking members are composed of a first locking member provided with a pressing member inserted into the mounting hole of the housing, and a second locking member not provided with the pressing member,
The first locking member can be moved in the pipe radial direction by operation of the pressing member,
The fluid pipe detachment preventing device according to claim 1, wherein the first bottom surface and the second bottom surface are provided at a location of the second locking member in the receiving groove.   The fluid pipe detachment preventing device according to claim 1 or 2, wherein the housing is formed of an undivided annular body.   A plurality of through holes extending in the tube axis direction are formed at a plurality of locations in the tube circumferential direction on the outer peripheral surface of the housing, and the total number of the plurality of locking members is less than the number of the through holes. 3. The fluid pipe detachment preventing device according to any one of 3 above. An outer fitting step of inserting an insertion port of the other tube into the receiving port of one tube, and externally fitting a housing formed of an annular body formed separately or integrally with the receiving port into the insertion port;
A locking step of locking a plurality of locking members housed in a housing groove that opens toward the outer circumferential surface of the insertion port to the outer circumferential surface of the insertion port,
The locking member includes an inclined surface whose outer diameter changes along the tube axis direction, a front claw formed on the front side in which the outer diameter of the inclined surface increases, and a rear in which the outer diameter of the inclined surface decreases. Having a rear nail formed on the side,
The housing groove has a first bottom surface that is expanded toward the front side, and a second bottom surface formed on the front side of the first bottom surface,
In the locking step, the first bottom surface is gradually separated from the inclined surface toward the front side while the first bottom surface is in contact with the rear side of the inclined surface, and the second bottom surface is disposed on the inclined surface. A fluid pipe detachment prevention method in which the front claw and the rear claw protruded from the housing groove are respectively engaged with the outer peripheral surface of the insertion port.

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