JP2009058134A - Pipe joint structure and fluid pipe for pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out manufacture of a pipe joint structure with superior earthquake resistance advantageously in a cost aspect and a construction time aspect by minimizing complicated machining at a construction site with respect to cut pipes, and to strongly prevent separation movement of the cut pipe and a socket pipe part in one end side of a fluid pipe even in such implementation as the same as a separation inhibiting mechanism between a spigot pipe part of another end side of the fluid pipe and a socket pipe part of another piping matertial. <P>SOLUTION: A fastening means 17 is provided for carrying out insertion connection of a cut end of the cut pipe 4 in the socket pipe part 3 of the fluid pipe P, externally fitting an elastic sealant 15 and a pressing ring 16 on the cut pipe 4, and tightening and fixing the pressing ring 16 and the socket pipe part 3. A biting inducing means A is provided between each nonslip member 18 attached to the pressing ring 16 and the pressing ring 16 for carrying out biting movement of the nonslip member 18. A circular nonslip protrusion 25 for nonseparation abutting on a securing member 24 from a pipe axis direction, provided on the socket pipe part 22 of a fit and connected piping equipment, is formed on an outer circumference face of the spigot pipe part 21 of the fluid pipe P. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for regenerating a remaining pipe that is generated when a straight tubular fluid pipe having a specified size carried into a piping construction site such as waterworks is cut based on a piping dimension actually measured at the construction site.

  Considering plumbing work such as waterworks, most of the work is done by connecting various piping equipment brought into the site based on the design according to a predetermined procedure, but part of it is done at each construction site. A method of cutting a straight tubular fluid pipe carried to the site and connecting the cut pipe based on the difference in piping dimension is adopted.

  And in order to configure the cut end of the cutting tube to be used cut to the piping dimensions in the insertion tube portion of the pipe joint structure, for example, as shown in FIG. 9 and FIG. An insertion guide tapered surface 52 having a smaller diameter toward the distal end side, and a lock ring 53 fitted and held on the inner peripheral surface of the receiving tube 3 are brought into contact with the cut end portion of the cut tube from the tube axis X direction. After cutting the annular mounting groove 55 for mounting the C-shaped retaining ring 54, the C-shaped retaining ring 54 that has been subjected to diameter expansion operation is mounted on the mounting groove 55 of the cut tube. A method is adopted in which both ends of the retaining ring 54 and the connecting pieces 56 for preventing slipping are fixedly connected by rivets 57 in a state where they are fixed in a predetermined posture by jigs. It has been.

  Further, the other remaining pipe is not used at the construction site where the cutting process is performed, and in order to use it at another construction site, it is necessary to perform the same processing as described above at the carry-in destination.

  As a straight tubular fluid pipe used for a cutting pipe, a cast iron pipe manufactured by centrifugal casting in which the outer diameter and thickness of the cut portion fall within an allowable value regardless of the position in the axial direction of the pipe. High-grade fluid pipes are used, but the remaining pipes have various dimensions. In addition, the remaining pipes include the first type pipe having a large thickness suitable for the cutting of the mounting groove 55 and the like. Since there are multiple types of pipes with different thicknesses, such as thin type 3 pipes, it is necessary to select a pipe type suitable for the joint structure required at each construction site. The current situation is that the remaining pipe 4 is discarded without being reused because it is very complicated and costly.

  Further, when cutting the annular mounting groove 55 for mounting the retaining ring 54 on the remaining pipe, it is necessary to perform the above-described complicated processing at the construction site, and in particular, the retaining ring. If a defective mounting of 54 occurs, the intended effect of preventing detachment is greatly reduced. Therefore, it is necessary to process the mounting groove 55 with high accuracy, and much labor is required to mount the retaining ring 54. For this reason, the regeneration cost of the remaining pipe 4 increases, and the processing period also becomes longer.

  The present invention has been made in view of the above-described actual situation, and the main problem is that the remaining pipes can be connected to other construction sites by simplifying the remaining pipe management and facilitating the processing at the construction site. The present invention provides a useful residual pipe joint method and a residual pipe joint structure that can be used as an insertion tube of a pipe joint structure.

  The characteristic configuration of the remaining pipe joint method according to claim 1 of the present invention is such that one side end of the cut remaining pipe is inserted and connected to a receiving pipe having a connecting means for piping equipment such as a fluid pipe. The gap between the inner peripheral surface of the receiving pipe part and the outer peripheral surface of the insertion pipe part of the remaining pipe is sealed with an elastic sealing material attached to the receiving pipe part, and retaining means provided in the receiving pipe part Thus, the insertion tube portion of the remaining tube is secured to the receiving tube portion.

  According to the above characteristic configuration, even when a plurality of types of straight tubular remaining pipes having different thicknesses generated as a result of the cutting of the fluid pipe are used as the inlet pipe of the pipe joint structure, one side end of the remaining pipe is used regardless of the thickness. After inserting the connection part into the receiving pipe part provided with connecting means for piping equipment such as a fluid pipe, the insertion pipe part of the remaining pipe is pulled out to the receiving pipe part by the retaining means provided in the receiving pipe part. Since it is only fixed and fixed, there is no need to sort the remaining pipe according to its thickness as in the past, and the elastic sealing material attached to the receiving pipe is not damaged even when processing the remaining pipe. In addition, it is only necessary to perform simple processing such as deburring or chamfering on the one side end portion of the remaining tube so that the one side end portion of the remaining tube can be smoothly inserted.

  Therefore, the management of the remaining pipe becomes extremely simple, and the remaining pipe can be processed simply by deburring or chamfering. As a result, the remaining pipe can be reused advantageously in terms of cost and time.

  The remaining pipe joint method according to claim 2 of the present invention is characterized in that a taper is formed at one side end of the remaining pipe with a smaller diameter toward the distal end and the base end side being the same or substantially the same as the outer diameter of the remaining pipe. After the insertion guide member having the insertion guide surface is fitted and mounted from the tube axis direction, the remaining tube is inserted and connected to the receiving tube portion from the mounting side of the insertion guide member.

  According to the above characteristic configuration, the insertion guide member is fitted and attached to the one side end portion of the remaining pipe from the tube axis direction, thereby using the insertion guide surface of the insertion guide member to receive the receiving pipe portion. Since it is possible to smoothly insert and connect to the pipe, it is not necessary to chamfer one end of the remaining pipe, and the cost of reusing the remaining pipe can be reduced and the construction period can be shortened. .

  The remaining pipe joint method according to claim 3 of the present invention is characterized in that an elastic sealing material that seals between the inner peripheral surface of the receiving pipe portion and the outer peripheral surface of the remaining pipe, and the elasticity A press ring that presses the sealing material from the tube axis direction and compresses it into a sealed state is sheathed, and one end of the remaining pipe is inserted and connected to the receiving pipe section, and the press ring and the receiving pipe section are connected to the pipe. Tighten and fix from the axial direction, and set each of the retaining members attached to multiple locations in the circumferential direction of the pusher wheel to be in the state of biting into the outer peripheral surface of the remaining pipe, and between each retaining member and the pusher wheel. The retaining member is configured to cause the retaining member to bite and move inward in the radial direction of the pipe in accordance with the relative detachment movement of both pipe portions.

  According to the above-described characteristic configuration, even when a plurality of types of straight tubular remaining pipes having different thicknesses generated as a result of the cutting of the fluid pipes are used as the insertion pipes of the pipe joint structure, the receiving pipe part is used regardless of the thickness. The inner pipe of the receiving pipe part and the remaining pipe are formed by covering the inserted and connected residual pipe with an elastic sealing material and a push ring and tightening and fixing the push ring and the receiving pipe part from the tube axis direction. The elastic sealing material that seals between the outer peripheral surfaces of the outer ring is pressed and compressed to a sealed state, and each of the retaining members mounted at multiple locations in the circumferential direction of the presser wheel is set in a state of being bitten into the outer peripheral surface of the remaining pipe Therefore, when an external force in the pulling direction is applied to both pipe parts due to an earthquake, uneven settlement, etc., the two pipe parts are moved relative to each other by the biting guide means provided between each retaining member and the push ring. Since the retaining member moves inwardly in the pipe radial direction as it moves away, It is possible to enhance the detachment preventing effect of the tube portion.

  Therefore, it is not necessary to select the remaining pipe according to its thickness as in the prior art, and the processing for the remaining pipe does not damage the elastic sealing material mounted on the remaining pipe. It is only necessary to perform simple processing such as deburring or chamfering on the one side end of the remaining pipe so that the one side end can be smoothly inserted.

  Therefore, the management of the remaining pipe becomes extremely simple, and the remaining pipe can be processed by simple processing such as deburring or chamfering. It can be used as an insertion tube for a joint structure, and the reuse of the remaining tube can be advantageously carried out in terms of cost and time.

  The characteristic structure of the remaining pipe joint structure according to claim 4 of the present invention is such that one end portion of the cut remaining pipe is inserted and connected to the receiving pipe section, and the inner peripheral surface of the receiving pipe section is connected to the remaining pipe. And an outer peripheral surface of the remaining pipe, and a press ring that presses the elastic seal material from the tube axis direction and compresses the elastic seal material to a sealed state. In addition to providing fastening means for tightening and fixing from the tube axis direction, each of a plurality of locations in the circumferential direction of the pusher wheel is provided with a retaining member having a biting protrusion that can be eaten on the outer peripheral surface of the remaining tube, and Between the retaining member and the push wheel, there is provided a biting guide means for biting and moving the retaining member inwardly in the pipe radial direction with relative movement of the both pipe portions.

  According to the above-described characteristic configuration, even when a plurality of types of straight tubular remaining pipes having different thicknesses generated as a result of the cutting of the fluid pipes are used as the insertion pipes of the pipe joint structure, the receiving pipe part is used regardless of the thickness. The remaining pipe connected by insertion is covered with an elastic sealing material and a pusher ring, and the fastening ring is tightened and fixed from the tube axis direction of the pusher ring and the receiving pipe part by the fastening means to the inner peripheral surface of the receiving pipe part. A state in which an elastic sealing material that seals between the outer peripheral surface of the remaining pipe is pressed and compressed to a sealed state, and each of retaining members mounted at a plurality of locations in the circumferential direction of the presser wheel is bitten into the outer peripheral surface of the remaining pipe When an external force in the pulling direction is applied to both pipe parts due to an earthquake or the like, the two pipe parts are moved relative to each other by the biting guide means provided between the retaining members and the press ring. As the retaining member bites and moves inwardly in the pipe radial direction, both Separation preventing effect of the parts can be enhanced.

  Therefore, it is not necessary to select the remaining pipe according to its thickness as in the prior art, and the processing for the remaining pipe does not damage the elastic sealing material mounted on the remaining pipe. It is only necessary to perform simple processing such as deburring or chamfering on the one side end of the remaining pipe so that the one side end can be smoothly inserted.

  Therefore, the management of the remaining pipe becomes extremely simple, and the remaining pipe can be processed by simple processing such as deburring or chamfering. It can be used as an insertion tube for a joint structure, and the reuse of the remaining tube can be advantageously carried out in terms of cost and time.

  The characteristic structure of the remaining pipe joint structure according to claim 5 of the present invention is that the biting tip edge of the biting protrusion is the same as or substantially the same as the radius of the outer peripheral surface of the insertion pipe portion of the remaining pipe in the tube axis direction view. It is in the point formed in the shape of an arc with a radius.

  According to the above characteristic configuration, when the biting tip edge of the biting projection is formed in an arc shape with the same radius as the outer peripheral surface of the insertion tube portion of the remaining tube, the biting tip of the biting projection The entire edge bites evenly with respect to the outer peripheral surface of the remaining pipe.

  In addition, when the biting tip edge of the biting projection is formed in an arc shape with a radius slightly larger than the radius of the outer peripheral surface of the insertion tube portion of the remaining pipe, the circumference of the biting tip edge of the biting projection is Although the central portion in the direction first bites into the outer peripheral surface of the insertion tube portion of the remaining pipe, the difference between the biting amount at the central portion in the circumferential direction and the biting amount at both ends in the circumferential direction is reduced be able to.

  Furthermore, when the biting tip edge of the biting projection is formed in an arc shape with a radius slightly smaller than the radius of the outer peripheral surface of the insertion tube portion of the remaining tube, the circumference of the biting tip edge of the biting projection is Since both ends in the direction bite into the outer peripheral surface of the insertion tube part of the remaining pipe first, the biting end edge bites compared to the case where the central part in the circumferential direction of the biting tip edge first bites into the outer peripheral surface of the inlet pipe part. The force can be easily dispersed in the circumferential direction, and the difference between the amount of biting at both ends in the circumferential direction and the amount of biting at the central portion in the circumferential direction can be reduced.

  Therefore, it is possible to achieve the predetermined detachment prevention function with an economical modification by simply remodeling the shape of the biting tip edge of each biting protrusion based on the outer diameter of the insertion pipe portion of the remaining pipe, while ensuring the predetermined separation prevention function. It is possible to satisfactorily suppress the occurrence of damage such as cracking and peeling in the corrosion-resistant lining layer applied to the inner peripheral surface of the pipe.

[First Embodiment]
1 to 3 show a residual pipe joint structure used in a piping system for fluid pipes such as water pipes and gas pipes, and is made of cast iron provided with connecting means 2 for piping equipment 1 such as fluid pipes and gate valves. For example, a residual pipe 4 generated by cutting a straight pipe fluid pipe made of cast iron manufactured by centrifugal casting specified in Japanese Industrial Standard (JIS) or the like at the construction site is formed in the mouth pipe portion 3. The one end is inserted and connected from the direction of the tube axis X, and the inner peripheral surface 3a of the receiving tube portion 3 is sealed between the outer peripheral surface 4a of the insertion tube portion 4A of the remaining tube 4. An annular seal holding groove 6 for fitting and holding an elastic sealing material 5 made of synthetic resin is formed, and the insertion tube portion 4 </ b> A of the remaining tube 4 is retained in the receiving tube portion 3 in the receiving tube portion 3. A retaining means 7 for fixing is provided.

  The connecting means 2 is constituted by a connecting flange portion integrally formed at one end of the receiving pipe portion 3 in the tube axis X direction, and other fluid pipes are provided at a plurality of locations in the circumferential direction of the connecting flange portion 2. A bolt insertion hole 2a is formed through the connecting flange portion 1A on the side of the piping equipment 1 such as a gate valve and the like through a bolt 8 and a nut 9.

  The retaining means 7 will be described. Of the receiving pipe part 3, the receiving pipe part 3 is provided on the receiving side with respect to the seal holding groove 6 and at a plurality of positions spaced at equal intervals in the circumferential direction. The female screw hole 7A is formed, and each female screw hole 7A has a sharp bite portion that can bite into the outer peripheral surface 4a of the remaining tube 4 in accordance with the screwing operation inward in the radial direction. A retaining member 7B provided with a screw 7a is screwed and attached to the end portion on the radially outer side of each retaining member 7B so that it cannot rotate relative to an artificial operation tool such as an Allen wrench from the radial direction. An operation recess 7b that is detachably fitted is formed.

  Then, the remaining pipe joint method for communicating and connecting one end of the straight tubular remaining pipe 4 generated with the cutting of the fluid pipe to the receiving pipe section 3 will be described. As shown in FIG. The elastic sealing material 5 is fitted and held in the seal holding groove 6 of the portion 3 and the retaining members 7B of the retaining means 7 are screwed to receive the biting portions 7a of the retaining members 7B. It is located radially outward from the inner peripheral surface 3 a of the pipe part 3.

  The annular elastic sealing material 5 that seals between the inner peripheral surface 3a of the receiving pipe portion 3 and the outer peripheral surface 4a of the insertion tube portion 4A of the remaining tube 4 is not damaged, and one side of the remaining tube 4 A tapered surface 4b having a smaller diameter on the one end of the remaining tube 4 is chamfered on the construction site so that the end can be smoothly inserted, and then the one end of the remaining tube 4 is received as an opening. The tube is inserted to a predetermined position in the tube portion 3, and each retaining member 7B of the retaining means 7 is screwed to the tightening side, and the insertion tube portion 4A of the remaining tube 4 is secured to the receiving tube portion 3 to be secured. To do.

  Therefore, even when a plurality of types of straight tubular remaining pipes 4 having different thicknesses generated by the cutting of the fluid pipe are used as insertion pipes of a pipe joint structure having a detachment preventing function, the remaining pipe 4 has a thickness thereof. There is no need to sort according to the situation, and it is only necessary to perform simple processing such as deburring or chamfering on one side end of the remaining pipe 4, so it can be carried directly to other construction sites to prevent separation. It can be used as an insertion tube having a pipe joint structure having a function, and the reuse of the remaining pipe 4 can be advantageously carried out in terms of cost and period.

[Second Embodiment]
FIG. 4 shows an improvement of the remaining pipe joint method described in the first embodiment, and the one end of the remaining pipe 4 has a smaller diameter toward the distal end and the outer diameter of the remaining pipe 4 at the proximal end side. After inserting and mounting a metal or synthetic resin insertion guide member 10 having a taper-shaped insertion guide surface 10a which is the same as or substantially the same as that of the tube core X in the press-fitted state, the insertion guide member 10 is One end of the mounted remaining tube 4 is inserted into and connected to the receiving tube 3, and the space between the inner peripheral surface 3 a of the receiving tube 3 and the outer peripheral surface 4 a of the insertion tube portion 4 </ b> A of the remaining tube 4. The sealing tube 5 is sealed with an elastic seal member 5 attached to the receiving tube portion 3, and the insertion tube portion 4 </ b> A of the remaining tube 4 is prevented from being removed from the receiving tube portion 3 by the retaining means 7 provided in the receiving tube portion 3. Fix it.

  For this reason, the insertion guide surface 10a of the insertion guide member 10 can be used to smoothly perform the insertion and connection operation to the receiving pipe portion 3, and therefore it is necessary to chamfer the one end portion of the remaining tube 4. In addition, it is possible to promote the reduction of the reuse cost of the remaining pipe 4 and the shortening of the construction period.

  In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
5 to 8 show a remaining pipe joint structure and a remaining pipe joint method used in a piping system for fluid pipes such as water pipes and gas pipes. One end of the remaining pipe 4 generated by cutting a straight pipe fluid pipe made of cast iron manufactured by centrifugal casting as defined by (JIS) etc. An annular synthetic rubber elastic sealing material that can be inserted and connected to the remaining pipe 4 and sealed between the inner peripheral surface 3a of the receiving pipe portion 3 and the outer peripheral surface 4a of the remaining pipe 4 to the inserted and connected residual pipe 4 15 and a cast iron push ring 16 that can be compressed to a sealed state (watertight state) by pressing the elastic sealing material 15 from the tube axis X direction, and the push ring 16 and the receiving pipe portion 3. Fastening means 17 is provided which is detachably fixedly connected to the tube axis X direction.

  The fastening means 17 includes bolt insertion holes 3b formed at a plurality of locations in the circumferential direction of the connection flange portion 3A integrally formed at the end of the receiving tube portion 3, and a plurality of locations in the circumferential direction of the outer peripheral surface of the press wheel 16. Of the bolt insertion holes 16a of the connecting protrusions 16A formed to project (eight places in this embodiment), a T-shape inserted across the bolt insertion holes 3b and 16a facing each other in the tube axis X direction. 17A and a nut 17B screwed to the screw shaft portion of the bolt 17A, and a tube shaft core between the presser wheel 16 and the receiving tube portion 3 in accordance with the tightening operation of the bolt 17A and nut 17B. Due to the relative proximity movement in the X direction, the elastic sealing material 15 is compressed and deformed by an annular seal pressing portion 16B formed at one end of the push ring 16 in the tube axis X direction, and the inner peripheral surface of the receiving tube portion 3 3a and the outer peripheral surface of the insertion tube portion 4A of the remaining tube 4 To seal between the a.

  The pusher wheel 16 is integrally formed in an annular shape that can be externally fitted from the tube axis X direction with respect to the insertion tube portion 4A of the remaining tube 4, and is equally spaced in the circumferential direction on the inner peripheral surface side. In a plurality of locations (eight locations in the present embodiment), recesses 16C that open inward in the tube diameter direction are formed, and in each recess 16C, a metal that can bite into the outer peripheral surface 4a of the remaining tube 4 is formed. The retaining members 18 are mounted, and the retaining members 18 are arranged between the retaining members 18 and the push wheels 16 in accordance with the relative detachment movement of the receiving tube portion 3 and the remaining tube 4. A biting guidance means A for biting and moving inward in the direction is provided.

  The biting guide means A includes an inclined receiving surface 18C having a larger diameter toward the receiving tube portion 1 side formed on the circumferential center portion of the outer surface of the retaining member 18, and a direction orthogonal to the inclined receiving surface 18C ( (In the vertical direction), the screw holes 16b formed in the portions facing the respective concave portions 16C of the press wheel 16 and the respective screw holes 16b are screwed in from the radially outer side through the inclined receiving surfaces 18C. The retaining member 18 includes a pressing bolt 19 that is an example of a pressing screw member that presses the retaining tube 18 toward the outer peripheral surface 4a side of the remaining tube 4, that is, radially inward.

  As shown in FIG. 8, triangular protrusions 18A and 18B, which are continuous in the circumferential direction, are integrally formed at both ends of the inner side surface (inner circumferential surface) of each retaining member 18 in the tube axis X direction. The length of each biting projection 18A, 18B in the pipe circumferential direction is the same or substantially the same, and the biting tip edge of each biting projection 18A, 18B is in the tube axis X direction view. The remaining pipe 4 is formed in an arc shape with a radius R that is the same or substantially the same as the radius R1 of the outer peripheral surface 4a.

  That is, the radius R for forming the biting tip edges of the biting protrusions 18A and 18B in an arc shape, when the radius of the outer peripheral surface 4a of the remaining tube 4 is R1, (less than R1 + 2 mm) to (R1-2 mm) In the range of (R1 + 1 mm) to (R1-1 mm), and most preferably the same diameter as R1.

  When the biting tip edges of the biting projections 18A and 18B are formed in an arc shape with a slightly larger radius R than the radius R1 of the outer peripheral surface 4a of the remaining tube 4, the biting projection 18A 18B, the circumferential center portion of the leading edge of the bite 18B first bites into the outer peripheral surface 4a of the remaining tube 4, but the biting amount at the central portion in the circumferential direction at the leading edge of the biting portion and biting at both ends in the circumferential direction The difference in amount can be reduced, and the biting tip edges of the biting projections 18A and 18B are formed in an arc shape with a radius R that is slightly larger than the radius R1 of the outer peripheral surface 4a of the remaining tube 4 within +1 mm. When it is done, the difference between the amount of biting at the central portion in the circumferential direction and the amount of biting at both end portions in the circumferential direction at the leading edge of the biting can be further reduced.

  Further, when the leading edge of the biting protrusions 18A and 18B is formed in an arc shape with a slightly smaller radius R within -2 mm than the radius R1 of the outer peripheral surface 4a of the remaining tube 4, the biting protrusion Since both end portions in the circumferential direction of the leading edge of the bites 18A and 18B first bite into the outer peripheral surface 4a of the remaining tube 4, the central portion in the circumferential direction of the leading tip edge first bites into the outer peripheral surface 4a of the remaining tube 4 Compared to the case, it is easy to disperse the biting force in the circumferential direction, and the difference between the biting amount at the circumferential end of the biting tip edge and the biting amount at the circumferential central portion is reduced. In addition, when the biting tip edges of the biting protrusions 18A and 18B are formed in an arc shape with a slightly smaller radius R within -1 mm than the radius R1 of the outer peripheral surface 4a of the remaining tube 4, The amount of biting at both ends in the circumferential direction at the leading edge of the biting and biting at the central portion in the circumferential direction It can further reduce the difference between the amount.

  Further, when the leading edge of the biting protrusions 18A and 18B is formed in an arc shape with the same radius R as the radius R1 of the outer peripheral surface 4a of the remaining pipe 4, the biting of the biting protrusions 18A and 18B The entire tip edge will bite evenly with respect to the outer peripheral surface 4a of the remaining pipe 4, and the biting amount at the circumferential central portion at the biting tip edge is equal to the biting amount at both circumferential ends. can do.

  Therefore, it is possible to satisfactorily suppress the occurrence of damage such as cracking or peeling in the corrosion-resistant lining layer 20 applied to the inner peripheral surface of the remaining pipe 4 while reliably exhibiting a predetermined separation preventing function. it can.

  Further, as shown in FIG. 8, the angle θ5 formed by the screwing shaft core (screw shaft core) Z of the pressing bolt 19 and the vertical line Y perpendicular to the tube shaft core X is inclined at 15 to 11 degrees. Within an angle range, preferably within an inclination angle range of 14-12 degrees, most preferably an inclination angle of 13 degrees.

  Then, due to an external force in the detachment direction caused by an earthquake, uneven settlement, etc., the tip end portion of the pressing bolt 19 screwed to the press wheel 16 and the inclined receiving surface 18C of the retaining member 18 are in the tube axis X direction. When the relative movement is performed, the amount of the retaining member 18 that bites inward in the radial direction with respect to the relative movement amount can be appropriately reduced. Therefore, the push wheel 16 can be reduced in size in the tube axis X direction (width reduction). However, it is possible to satisfactorily suppress the occurrence of damage such as cracking and peeling in the corrosion-resistant lining layer 20 of the remaining tube 4.

  Further, between the insertion tube portion 21 formed on the other end side of the fluid tube P and the receiving tube portion 22 of another fluid tube P1 which is an example of piping equipment fitted and connected thereto, both pipes are provided. When the parts 21 and 22 move relative to each other along the tube axis X direction, the connecting means 2 that contacts with each other from the tube axis X direction to prevent further movement, and the insertion tube unit 21 The bending prevention means 11 for maintaining the mouth tube portion 22 in the coaxial core state, and an annular synthetic rubber capable of sealing between the outer peripheral surface of the insertion tube portion 21 and the inner peripheral surface of the receiving tube portion 22 Are provided on the outer peripheral surface of the insertion tube portion 21 and at a plurality of locations (four locations in the embodiment) spaced equally in the circumferential direction. A joining protrusion 23 is formed to contact the end face of the tube from the tube axis X direction.

  To form the connecting means 2, an annular mounting groove 22a formed on the inner peripheral surface of the receiving pipe portion 22 is provided on the diameter-enlarged side formed in a substantially C shape when viewed from the tube axis X direction. An elastically deformable stainless steel locking member 24 and an elastic holding ring 27 that holds the locking member 24 coaxially with the receiving tube portion 22 in a state in which the diameter expansion deformation of the locking member 24 is allowed. At the same time, at the distal end portion of the outer peripheral surface of the insertion tube portion 21, when both the tube portions 21 and 22 move relative to each other more than a certain amount due to an earthquake or uneven settlement, the tube is moved with respect to the locking member 24. An annular retaining protrusion 25 is integrally formed so as to be in contact with the axial center X direction and prevent further relative movement of the pipe portions 21 and 22 beyond that.

  As shown in FIG. 5, the bending preventing means 11 is joined to the outer peripheral surface of the insertion tube portion 21, the portion continuing to the bonding protrusion 23, and each of the circumferential intermediate portions thereof. A stainless steel that is integrally formed with a projection 28 having a smaller projection allowance than the projection 23 and that is elastically deformable on the diameter-expanding side that contacts the plurality of projections 28 of the insertion tube portion 21. It is composed of a steel bending prevention ring 29 and a plurality of set bolts 30 that are pressed radially inward at a plurality of locations in the circumferential direction of the bending prevention ring 29 to be reduced in diameter.

  Further, an annular seal holding groove 22b for holding the elastic seal material 26 is formed on the inner peripheral surface of the receiving pipe portion 22 and between the bending prevention ring 29 and the locking member 24. Is formed.

  In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) At the one side end of the remaining tube 4 described in the third embodiment, as in the second embodiment shown in FIG. 4, the distal end side has a smaller diameter and the base end side is outside the remaining tube 4. A metal or synthetic resin insertion guide member 10 having a tapered insertion guide surface 10a having the same or substantially the same diameter is fitted and mounted in a press-fit state from the tube axis X direction. One side end portion of the remaining tube 4 to which is attached may be inserted and connected to the receiving tube portion 3.

(2) In the above-described third embodiment, the biting guide means A includes the inclined receiving surface 18C having a larger diameter toward the receiving tube portion 3 formed on the outer surface of the retaining member 18, and the inclined receiving surface. The inclined receiving surface 18C is formed by screwing into the screw holes 16b formed in the portions facing the concave portions 16C of the press wheel 16 along the direction orthogonal to the surface 18C, and the screw holes 16b from the radially outer side. The retaining member 18 is configured by a pressing bolt 19 that presses the retaining member 18 toward the outer peripheral surface 4a side of the remaining tube 4. However, the retaining member 18 is inclined between the inclined receiving surface 18C of the retaining member 18 and the tip of the pressing bolt 19. You may implement by interposing the metal pressing member provided with the biting guide surface of the same gradient which slidably contacts surface 18C.
In short, as the engulfing guiding means A, any means can be used as long as the retaining member 18 can be engulfed and moved inwardly in the radial direction of the pipe with the relative detachment movement of the remaining pipe 4 and the receiving pipe part 3. Any structure may be used.

  (3) In the above-described third embodiment, the pusher wheel 16 is integrally formed in an annular shape that can be externally fitted to the insertion tube portion 4A of the remaining tube 4 from the tube axis X direction. You may comprise from the some division | segmentation press ring body divided | segmented into multiple in the circumferential direction.

The half section side view before the remaining pipe connection which shows 1st Embodiment of this invention Half-section side view after connecting the remaining pipe Sectional view taken along line III-III in FIG. The half section side view after the remaining pipe connection which shows 2nd Embodiment of this invention Sectional side view after remaining pipe connection showing a third embodiment of the present invention The VI-VI line expanded sectional view in FIG. Enlarged cross-sectional front view of the main part of the press ring Expanded cross-sectional side view of the main part of the press ring Cross-sectional side view of main parts showing conventional remaining pipe joint structure Front view of retaining ring and coupling piece after fixed connection

Explanation of symbols

A Biting guidance means X Pipe shaft core 1 Piping equipment 2 Connection means (connection flange part)
DESCRIPTION OF SYMBOLS 3 Receptacle pipe part 3a Inner peripheral surface 4 Remaining pipe 4A Insertion pipe part 4a Outer peripheral surface 7 Detaching means 10 Insertion guide member 10a Insertion guide surface 15 Elastic seal material 16 Push ring 17 Fastening means 18 Detaching member

Claims (2)

  The cut end of the cut tube cut at the construction site is inserted and connected to the receiving pipe formed on one end of the fluid pipe, and the inner peripheral surface of the receiving pipe and the cut pipe are connected to this cut pipe. An elastic sealing material that seals between the outer peripheral surface and a press ring that presses the elastic sealing material from the tube axis direction and compresses the elastic seal material to a sealed state is externally provided, and the press ring and the receiving pipe portion are connected to the tube axis core. Fastening means for tightening and fixing from the direction is provided, and a retaining member capable of biting into the outer peripheral surface of the cut tube is attached to each of the plurality of circumferential positions of the pusher wheel, and between each retaining member and the pusher wheel. Is provided with a biting guide means for biting and moving the retaining member inwardly in the pipe radial direction with the relative separation movement of both pipe parts, and further, an inlet pipe formed on the other end side of the fluid pipe A fitting pipe part of other piping equipment is fitted and connected to the section, and the tip of the outer peripheral surface of the inlet pipe part of the fluid pipe is connected to the pipe part. A pipe joint structure in which an annular retaining protrusion is formed to contact the locking member provided in the receiving pipe part of the equipment from the axial direction of the pipe and prevent relative detachment movement of both pipe parts beyond that. .   It is the said fluid pipe | tube used for the pipe joint structure of Claim 1, Comprising: The connection flange part provided with the bolt insertion hole by which the volt | bolt of the said fastening means is penetrated in the edge part of the outer peripheral surface of the said receiving pipe part Is formed integrally, and the retaining protrusion is integrally formed at the distal end portion of the outer peripheral surface of the insertion tube portion.

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