JP2012087846A - Separation preventive device of pipe joint and pressing ring used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform fixing-connecting work of respective bolt insertion parts of a pressing ring and a connecting flange of a socket pipe part, while using a short size bolt, without having adverse influence on the formation of a recessed part by rational remodeling of the bolt insertion part of a specific part in a connecting part of the pressing ring.SOLUTION: A plurality of slipping-out preventive members capable of biting in an outer peripheral surface of a spigot pipe part are arranged in the recessed part of the pressing ring A compressible up to a sealing state by pressing an elastic sealant interposed between an inner peripheral surface of the socket pipe part and the outer peripheral surface of the spigot pipe part from the pipe axis direction, and among bolt insertion parts 20A and 20B in a plurality of places in the peripheral direction in a connecting part of the pressing ring A, a thickness W1 in the pipe axis direction of the bolt insertion part 20A corresponding to the specific part between the adjacent slipping-out preventive members stored in the recessed part, is constituted smaller than a thickness W2 in the pipe axis direction of the other bolt insertion part 20B with one side surface 20b of the connecting part 20 opposed to the connecting flange of the socket pipe part as a common reference.

Description

  The present invention relates to an elastic sealing material capable of sealing between an inner peripheral surface of the receiving tube portion and an outer peripheral surface of the insertion tube portion, and an elastic member that is inserted and connected to the receiving tube portion. A press ring that can be compressed to a sealed state by pressing the seal material from the tube axis direction is externally mounted, and the connecting portion of the press ring and the connection flange of the receiving tube portion are tightened with a plurality of bolts from the tube axis direction. A pipe joint provided with fastening means for fixing, and provided with a plurality of retaining members capable of biting into the outer peripheral surface of the insertion tube section in a radially inwardly formed recess formed in the push ring The present invention relates to a device for preventing detachment and a push ring used therefor.

  In a conventional pipe joint detachment prevention device, for example, as shown in Patent Document 1 below, the depressions of the push ring are formed with a size capable of accommodating one retaining member and spaced in the circumferential direction. The connecting portion of the push wheel is composed of a semi-circular or semi-oval-shaped bolt insertion portion provided with a bolt insertion hole that protrudes from the outer peripheral surface of the corresponding portion between the plurality of concave portions. In addition, the thickness of each of the bolt insertion portions in the tube axis direction is unified to the same dimension as the thickness dimension in the tube axis direction at the recessed portion formation portion.

  In addition, in the case of the following Patent Document 2, the depression of the push wheel is constituted by two depressions formed in a circumferential direction with a size that can accommodate a plurality of retaining members, and the connection of the push wheel The portion is composed of a semicircular or semi-oval shaped connecting convex portion having bolt insertion holes protruding at a plurality of locations in the circumferential direction of the outer peripheral surface, and in the tube axis direction of each bolt insertion portion. Is uniformly configured to a dimension slightly smaller than the thickness dimension in the tube axis direction at the recessed portion forming portion.

JP 2003-222279 A Japanese Patent Laid-Open No. 2004-301212

  In the former former detachment prevention device, the thickness of each bolt insertion part in the tube axis direction is unified and configured to be the same as the thickness dimension in the tube axis direction of the recess forming portion where the retaining member is housed. Therefore, when the bolts of the fastening means are mounted across the bolt insertion parts of the press ring and the connection flanges of the receiving pipe parts, the bolts have thickness dimensions in the tube axis direction of the bolt insertion parts, and the connection flanges. The thickness dimension in the tube axis direction, the gap dimension between the opposing surfaces of the bolt insertion part and the connecting flange formed by the non-compressed elastic seal material before the tightening operation, and the screwing allowance of the nut are added. It is necessary to use non-standard long bolts compared to general-purpose detachment prevention devices that use a press ring that does not have a recess to house the retaining member and requires a long bolt. One of the factors There.

  Further, in the latter latter detachment prevention device, the thickness of each bolt insertion portion in the tube axis direction is unified to be a dimension slightly smaller than the thickness dimension in the tube axis direction of the recess forming portion. However, the bolt insertion portion is thinned at a portion that is radially outwardly displaced from the recess formation portion, and a bolt is tightened with a tool around the bolt insertion hole formed in the bolt insertion portion. Therefore, it is necessary to secure a rotation operation space for this purpose, so that the bolt pitch, which is the center interval between the two bolt insertion holes facing each other in the radial direction, is increased, which tends to increase the size of the push wheel.

  Therefore, in this latter separation preventing device, in order to avoid an increase in the size of the press wheel, an arc-shaped recess for securing a rotation operation space by a tool is formed on the outer peripheral surface of the press wheel corresponding to the bolt insertion portion. However, when the nominal diameter of the press wheel is reduced, the concave portion of the press wheel and the arc-shaped concave portion formed in the recess interfere with each other. Therefore, in the case of a press wheel with a small nominal diameter, the same structure as the former separation preventing device is adopted. Yes.

  The present invention has been made in view of the above-described actual situation, and its main problem is that it adversely affects the formation of the concave portion by rational modification of the bolt insertion portion at a specific portion in the connecting portion of the press wheel. Without using a short bolt, a pipe joint disengagement prevention device and a press ring used therefor that can easily fix and connect each bolt insertion part of the press ring and the connection flange of the receiving pipe part. The point is to provide.

According to a first characteristic configuration of the present invention, the insertion tube portion inserted and connected to the receiving tube portion is elastic to seal between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion. A sealing material and a press ring that can be compressed to a sealed state by pressing the elastic sealing material from the tube axis direction are packaged, and the connecting portion of the press wheel and the connecting flange of the receiving tube portion are connected from the tube axis direction. A plurality of retaining members provided with fastening means for fastening with a plurality of bolts and capable of biting into an outer peripheral surface of the insertion tube portion in a radially inward opening formed in the push ring A fitting prevention device for a pipe joint provided with
Of the bolt insertion portions at a plurality of circumferential positions in the connecting portion of the push ring, the thickness of the bolt insertion portion corresponding to a specific portion between adjacent retaining members housed in the recess is determined in the tube axis direction. The one side surface of the connecting portion facing the connecting flange of the tube portion is configured to be smaller than the thickness of the other bolt insertion portion in the tube axis direction with a common reference.

  According to the above configuration, the gap between the retaining members accommodated in the depressions of the push wheel has an appropriate length in the circumferential direction, and the basal part on the radially inner side of the bolt insertion part and the depression Since it is possible to ensure a distance of a suitable length in between, the thickness of the bolt insertion portion in the tube axis direction corresponding to a specific portion between adjacent retaining members accommodated in the recess is determined by the receiving tube portion. Even if it is configured to be smaller than the thickness of the other bolt insertion portion in the tube axis direction with one side surface of the connecting portion facing the connecting flange as a common reference, the formation of the concave portion is not adversely affected. .

Therefore, when tightening and fixing each bolt insertion part of the push ring and the connecting flange of the receiving pipe part with a plurality of bolts of the fastening means, the specific part formed with a thin wall is used as the first stage fastening and fixing operation. The bolt is inserted over the bolt insertion part and the connecting flange of the receiving pipe part, and the inner peripheral surface of the receiving pipe part is moved by the relative pulling movement of the receiving pipe part and the press ring accompanying the tightening and fixing operation of the bolt. The elastic sealing material interposed between the outer peripheral surface of the insertion tube portion and the insertion tube portion is compressed with a push ring from the tube axis direction.
In this state, due to the compression of the elastic sealing material, the distance between the opposed surfaces of the bolt insertion portion and the connecting flange of the receiving pipe portion is narrowed. The insertion part and the connecting flange of the receiving pipe part can be fastened and fixed with the bolt of the same length used in the bolt insertion part at the specific part.

  Therefore, the bolt insertion part of the other part is made to have the thickness of the bolt insertion part of the other part by utilizing the special characteristics of the structure of the bolt insertion part corresponding to the particular part between the adjacent parts of the retaining member housed in the recess. By making a reasonable modification to make the thickness smaller than the thickness of the recess, without adversely affecting the formation of the recess, and using a short bolt, each bolt insertion portion of the press wheel and the connection flange of the receiving pipe portion Fixed connection work can be performed reliably and easily.

According to a second characteristic configuration of the present invention, the insertion tube portion inserted and connected to the receiving tube portion is elastic to seal between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion. A sealing material and a press ring that can be compressed to a sealed state by pressing the elastic sealing material from the tube axis direction are packaged, and the connecting portion of the press wheel and the connecting flange of the receiving tube portion are connected from the tube axis direction. Fastening means for fastening and fixing with at least four bolts is provided, and at least two recesses that open toward the radially inner side formed in the pusher wheel can be bitten into the outer peripheral surface of the insertion tube portion. A pipe joint detachment prevention device provided with a retaining member,
Of the at least four bolt insertion portions in the connecting portion of the press ring, two bolt insertion portions that are paired in the radial direction at a specific portion between adjacent retaining members housed in the recesses in the tube axis direction. The thickness is configured to be smaller than the thickness of the other bolt insertion portion in the tube axis direction with one side surface of the connecting portion facing the connecting flange of the receiving tube portion as a common reference.

  According to the above configuration, the gap between the retaining members accommodated in the depressions of the push wheel has an appropriate length in the circumferential direction, and the basal part on the radially inner side of the bolt insertion part and the depression Since a distance of a suitable length can be secured between them, the thickness in the tube axis direction of the two bolt insertion portions that form a pair in the radial direction at a specific portion between adjacent portions of the retaining member housed in the concave portion Even if it is configured to be smaller than the thickness of the other bolt insertion portion in the tube axis direction with respect to one side surface of the connecting portion facing the connecting flange of the receiving tube portion, the formation of the concave portion Does not adversely affect

Therefore, when fastening each bolt insertion part of the push ring and the connecting flange of the receiving pipe part with at least four bolts of the fastening means, as the first stage fastening and fixing operation, the thinly formed diameter The bolts are mounted across the two bolt insertion parts and the connection flanges of the receiving pipe part that make a pair in the direction, and the receiving pipe part and the pusher wheel are relatively pulled together by tightening and fixing the bolts at these two places. By the movement, the elastic seal material interposed between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion is compressed almost uniformly with a push ring from the tube axis direction.
In this state, due to the compression of the elastic seal material, the distance between the opposed surfaces of the bolt insertion portion and the connecting flange of the receiving pipe portion is substantially uniformly narrowed in the circumferential direction. The bolt insertion part other than the specific part and the connecting flange of the receiving pipe part can be fastened and fixed with the bolt of the same length used in the bolt insertion part of the specific part.

  Therefore, the thickness of the bolt insertion portions at two locations which are paired in the radial direction at the specific portion by utilizing the special structure of the bolt insertion portion corresponding to the specific portion between the adjacent portions of the retaining member housed in the concave portion. , By making a rational modification that only makes the thickness of the bolt insertion portion of the other part smaller than that, without adversely affecting the formation of the concave portion, and using each bolt insertion portion of the press wheel with a short bolt Fixing and connecting work with the connecting flange of the receiving pipe portion can be performed reliably and easily.

  According to a third characteristic configuration of the present invention, the retaining member is moved in the circumferential direction between the recesses of the push wheel adjacent to the retaining member corresponding to the bolt insertion portion formed with the small thickness. It is in the point where the wall part which blocks is formed.

According to the above configuration, the wall formed in the concave portion of the push ring prevents the retaining member housed in the concave portion from moving in the circumferential direction, and the retaining member is always eaten radially inward at an appropriate position. Can be moved.
Moreover, since the wall portion of the concave portion is formed between the retaining members corresponding to the bolt insertion portion formed with a small thickness, for example, the wall portion of the concave portion is formed on the bolt insertion portion formed with a small thickness. In order to secure a rotation operation space for tightening the bolt with a tool around the bolt insertion hole, an arc-shaped recess for bolt operation is provided on the outer peripheral surface of the press wheel corresponding to the bolt insertion portion formed with this small thickness. Even if the recess is formed, a partition wall portion having a predetermined thickness can be reliably formed between the arc-shaped recess and the recess.

  According to a fourth characteristic configuration of the present invention, the interval between the retaining members corresponding to the bolt insertion portions formed with the small thickness is configured to be larger than the interval between the retaining members at other portions. It is in.

  According to the above configuration, the adjacent thickness of the retaining member corresponding to the bolt insertion portion formed in the smaller thickness is smaller than the adjacent spacing of the retaining member in the other part. Since a relatively large distance can be ensured between the base portion on the radially inner side of the bolt insertion portion formed on the concave portion and the concave portion, for example, a bolt formed on the bolt insertion portion formed with a small thickness In order to secure a rotational operation space for tightening the bolt with a tool around the insertion hole, an arc-shaped recess for bolt operation is recessed in the outer peripheral surface of the press wheel corresponding to the bolt insertion portion formed with this small thickness. Even if it forms, the partition wall part of predetermined thickness can be easily formed between this arc-shaped recessed part and a recessed part.

  According to a fifth characteristic configuration of the present invention, a side surface serving as a common reference of the connecting portion is brought into contact with the connecting flange of the receiving tube portion from the tube axis direction in accordance with the tightening and fixing operation by the bolt of the fastening means. The contact surface is formed.

  According to the above configuration, when the bolt insertion part of the push ring and the connection flange of the receiving pipe part are fastened and fixed by the bolt of the fastening means, the contact surface formed on one side surface that is a common reference of the connection part is It is only necessary to tighten and fix the bolt until it comes into contact with the connecting flange of the receiving pipe portion from the tube axis direction, and it is possible to simplify the tightening and fixing operation while securely compressing the elastic seal material to a predetermined sealed state. Can be planned.

  A sixth characteristic configuration according to the present invention is the push wheel used in the pipe joint detachment prevention device having any one of the characteristic configurations described in the above 1 to 5, wherein the bolt insertion portion is adjacent to each other between the bolt insertion portions. A pressing bolt is provided to move the retaining member housed in the recess toward the radially inward side.

  According to the above configuration, the gap between the retaining members accommodated in the depressions of the push wheel has an appropriate length in the circumferential direction, and the basal part on the radially inner side of the bolt insertion part and the depression Since it is possible to ensure a distance of a suitable length in between, the thickness of the bolt insertion portion in the tube axis direction corresponding to a specific portion between adjacent retaining members accommodated in the recess is determined by the receiving tube portion. Even if it is configured to be smaller than the thickness of the other bolt insertion portion in the tube axis direction with one side surface of the connecting portion facing the connecting flange as a common reference, the formation of the concave portion is not adversely affected. .

  Therefore, the thickness of the bolt insertion part at the specific part is set to the bolt part of the other part by utilizing the peculiarity of the structure of the bolt insertion part corresponding to the specific part between the adjacent parts of the retaining member housed in the depression of the push wheel. By using a reasonable modification that only makes the thickness of the insertion portion smaller than that of the insertion portion, it does not adversely affect the formation of the concave portion, and a short bolt is used to connect each bolt insertion portion of the press ring to the receiving pipe portion. Can be securely and easily connected to the bolt insertion portion, and the pressing bolt provided between the adjacent bolt insertion portions can force the retaining member housed in the recess toward the radially inward side. Can be moved.

The longitudinal cross-sectional view in the bolt insertion part formed in the small thickness which shows the separation prevention apparatus of the pipe joint of 1st Embodiment of this invention of this application Longitudinal sectional view at the bolt insertion part formed to a large thickness of the pipe joint detachment prevention device Front view of press wheel Rear view of press ring Top view of press ring Right side view of press ring VII-VII line sectional view of FIG. VIII-VIII line end view of FIG. End view of line IX-IX in Fig. 3 XX line end view of FIG. Longitudinal sectional view before tightening and fixing at the bolt insertion part formed to a small thickness Longitudinal sectional view before tightening and fixing at the bolt insertion part formed to a large thickness The front view which shows the press ring of the detachment prevention apparatus for pipe joints of 2nd Embodiment of this invention. Rear view of press ring Top view of press ring Right side view of press ring XVII-XVII sectional view of FIG. The front view which shows the push ring of the detachment | desorption prevention apparatus for pipe joints of 3rd Embodiment of this invention. Top view of press ring Cross section of press ring

[First Embodiment]
1 to 12 show an apparatus for preventing the disconnection of a pipe joint of a fluid pipe (for example, a water pipe or a gas pipe), and the insertion of the other fluid pipe inserted and connected to the receiving pipe portion 1 of the one fluid pipe. An elastic sealing material 3 made of synthetic rubber capable of sealing between the inner peripheral surface 1a of the receiving pipe portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 and the elastic sealing material 3 are attached to the mouth pipe portion 2. A cast iron pusher wheel A that is pressed from the tube axis X direction and can be compressed to a sealed state (watertight state) is externally provided.

  A connecting portion 20 comprising semi-circular or semi-oval-shaped bolt insertion portions 20A and 20B having bolt insertion holes 20a formed to protrude at a plurality of circumferential locations (six locations in the present embodiment) on the outer peripheral surface of the press wheel A. And the presser wheel A and the receiving tube portion 1 are tightened while being relatively pulled from the tube axis X direction over the annular connecting flange 1A formed to project from the end of the outer peripheral surface of the receiving tube portion 1. Fastening means 4 for fixing is provided, and further, both pipe parts 1 and 2 are disposed in the X axis direction in the opposite direction of the receiving pipe part 1 and the insertion pipe part 2 fitted and connected thereto. When the relative disengagement movement is performed, a disengagement prevention means B is provided that contacts each other from the tube axis X direction and prevents further disengagement movement.

The fastening means 4 includes bolt insertion holes 1b formed at a plurality of circumferential positions (six positions in the present embodiment) of the connection flange 1A of the receiving pipe section 1 and a plurality of bolt insertion sections at a circumferential position of the presser wheel A. Among the bolt insertion holes 20a of 20A and 20B, a T-shaped bolt 4A inserted across the bolt insertion holes 1b and 20a facing each other in the tube axis X direction, and a screw on the protruding screw portion of the bolt 4A And a nut 4B to be joined.
Then, due to the relative proximity movement of the pusher wheel A and the receiving pipe part 1 in the tube axis X direction accompanying the tightening operation of the bolt 4A and the nut 4B, an annular shape is formed on one side surface of the pusher wheel A in the tube axis X direction. The elastic sealing material 3 is compressed and deformed by the seal pressing portion 21 formed in the depression, and the space between the inner peripheral surface 1a of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 is sealed.

  As shown in FIGS. 1 and 2, the separation preventing means B is formed in an annular mounting groove 10 formed on the inner peripheral surface 1a of the receiving pipe portion 1 in the tube axis X direction view. A locking member 11 made of metal that is elastically deformable on the diameter-enlarged side formed in a letter C shape, and the locking member 11 is received in the receiving pipe portion 1 in a state that allows the diameter-enlarging deformation of the locking member 11. And an elastic holding ring 12 that holds the coaxial core state, and the tube portions 1 and 2 are fixed at the distal end portion of the outer peripheral surface of the insertion tube portion 2 due to an earthquake or uneven settlement. When the relative disengagement movement is performed as described above, an annular retaining protrusion 13 that comes into contact with the locking member 11 from the direction of the tube axis X and prevents further disengagement of both the pipe portions 1 and 2 is provided. It is integrally formed.

  As shown in FIGS. 1 to 4, the pusher wheel A is formed in an annular shape with an inner diameter slightly larger than the outer diameter of the insertion tube portion 2, and the inner peripheral surface of the pusher wheel A is radially inward. A plurality of (six in the present embodiment) metal retaining members 22 that are open toward the outer periphery 2a and are movable from the outer circumferential surface 2a of the insertion tube portion 2 in the radial direction. A recess 23 having a circumferential groove shape that can be housed and disposed is formed.

Of the bolt insertion portions 20A and 20B integrally formed at six locations on the outer peripheral surface of the pusher wheel A, two bolts that are paired in the radial direction at specific locations between adjacent retaining members 22 housed in the recess 23 The thickness of the insertion portion 20A in the tube axis direction (thickness from one side surface 20b to the other side surface 20c of the bolt insertion portion 20A) W1 of the connection portion 20 facing the connection flange 1A of the receiving tube portion 1 The thickness of the other four bolt insertion portions (hereinafter referred to as bolt insertion portions other than the specific portion) 20B in the tube axis X direction (from one side surface 20b of the bolt insertion portion 20B), with the side surface 20b as a common reference The thickness up to the side surface 20d) is smaller than W2.
More specifically, the thickness W1 in the tube axis direction of both bolt insertion portions 20A of the specific part is from the side surface 20b on the common reference side in the other bolt insertion portion 20B to the intermediate position in the tube axis X direction of the recess 23. It is configured to be thin with various dimensions.

  Therefore, as shown in FIGS. 11 and 12, the one end portion of the non-compressed elastic sealing material 3 sheathed on the insertion tube portion 2 is applied to the inner peripheral surface 1 a of the reception tube portion 1, and Before the tightening operation in which the seal pressing portion 21 of the pusher wheel A is applied to the other end portion of the elastic sealing material 3 in the non-compressed state, it is specified from the other side surface 1d which is the back surface of the connection flange 1A of the receiving tube portion 1. The bolt insertion interval L1 to the other side surface 20c of the bolt insertion portion 20A at the site is shorter than the bolt insertion interval L2 from the other side surface 1d of the connecting flange 1A to the other side surface 20c of the bolt insertion unit 20B other than the specific site.

  In the case of FIG. 12, even if the same bolt 4A that fastens and fixes both the bolt insertion portions 20A of the specific portion and the connecting flange 1A of the receiving tube portion 1 is used, the bolt insertion portions other than the specific portion of the presser wheel A The tip of the threaded portion of the bolt 4A inserted through the bolt insertion hole 20a of 20B and the bolt insertion hole 1b of the connecting flange 1A of the receiving pipe portion 1 facing each other in the direction of the tube axis X does not protrude or the amount of protrusion is small. It becomes very small and the nut 4B cannot be screwed.

  Therefore, when the bolt insertion portions 20A and 20B of the pusher wheel A and the connecting flange 1A of the receiving tube portion 1 are fastened and fixed by the six bolts 4A and nuts 4B of the fastening means 4, the first stage of fastening fixing is performed. As an operation, as shown in FIGS. 11 and 1, the bolt insertion holes 20 a of both bolt insertion portions 20 A of the specific portions that make a pair in the thin radial direction and the bolt insertion of the connection flange 1 A of the receiving pipe portion 1. The bolt 4A is mounted over the hole 1b, and the interior of the receiving pipe portion 1 is moved by the relative pulling movement of the receiving pipe portion 1 and the pusher wheel A accompanying the tightening and fixing operation of the bolt 4A and the nut 4B at these two locations. The elastic sealing material 3 interposed between the peripheral surface 1a and the outer peripheral surface 2a of the insertion tube portion 2 is compressed approximately uniformly by the pusher wheel A from the tube axis X direction.

  In this state, due to the compressive deformation of the elastic sealing material 3, the spacing between the opposed surfaces of the bolt insertion portions 20A, 20B and the connection flange 1A of the receiving tube portion 1 is substantially uniformly narrowed in the circumferential direction. At the time of eye tightening and fixing operation, as shown in FIG. 2, the bolt insertion part 20B other than the specific part and the connecting flange 1A of the receiving pipe part 1 are of the same length used in the bolt insertion part 20A of the specific part. The bolt 4A can be fastened and fixed.

As shown in FIG. 7, the adjacent interval W3 of the retaining member 22 corresponding to both bolt insertion portions 20A of the specific portion formed in the small thickness is larger than the adjacent interval W4 of the retaining member 22 of other portions. And, it is configured to be larger than the maximum width W6 in the circumferential direction of the bolt insertion portion 20A at the specific portion, and corresponds to the both bolt insertion portions 20A at the specific portion of the recess 23 of the pusher wheel A. A partition wall 24 that prevents movement of the retaining member 22 in the circumferential direction is formed integrally between the retaining members 22.
The two concave portions 23 defined by the partition wall portion 24 are configured symmetrically with a circumferential length capable of accommodating the three retaining members 22 along the circumferential direction.

  The circumferential width W5 of the partition wall portions 24 is a dimension slightly smaller than the circumferential width passing through the bolt insertion center line in the bolt insertion portion 20A of the specific portion, and of the retaining member 22 other than the specific portion. The size is a little more than twice the adjacent interval W4.

  On the outer peripheral surface of the presser wheel A corresponding to the partition wall portions 24 and the portion corresponding to the other side surface 20c of the bolt insertion portion 20A of the specific portion formed in a small thickness, the bolt of the specific portion is provided. An arc-shaped recess 25 is formed around the bolt insertion hole 2a formed in the insertion portion 20A so as to secure a rotation operation space for tightening the bolt 4A and the nut 4B with a rotation operation tool. A substantially U-shaped vertical groove portion 26 that is recessed in the radial direction from the other side surface 20 c side to the partition wall portions 24 is formed at the bottom of the recess 25.

  As shown in FIG. 7, in the recess 23 of the pusher wheel A, between the partition wall portions 24 and one end portion of the retaining member 22 facing the circumferential wall 24, and adjacent end portions of the retaining member 22. In each of the gaps, an elastic body 27 made of synthetic rubber is interposed in a compressed state to prevent the slipping members 22 from dropping out inward in the radial direction in a state where the arrangement interval in the circumferential direction of each retaining member 22 is regulated to the set arrangement interval. ing.

  A screw hole penetrating in the radial direction is provided between the circumferentially adjacent bolt insertion portions 20A and 20B of the pusher wheel A and at a portion corresponding to the center position in the circumferential direction of each retaining member 22 housed in the recess 23. 28 is formed, and each screw hole 28 is provided with a pressing bolt 29 that bites and moves each retaining member 22 toward the radially inner side.

  When the bolt insertion portions 20A and 20B of the pusher wheel A and the connecting flange 1A of the receiving tube portion 1 are fastened and fixed with the bolts 4A and nuts 4B of the fastening means 4, the retaining members 22 are inserted. After maintaining the non-engraving state separated from the outer peripheral surface 2a of the pipe portion 2 in the radially outward direction and completing the tightening and fixing by the bolt 4A and nut 4B of the fastening means 4, the pressing bolt 29 is moved in the radial direction. By pushing inward toward the inward side, each retaining member 22 is bitten into the outer peripheral surface 2 a of the insertion tube portion 2.

  Then, the partition wall portions 24 formed in the recessed portion 23 of the pusher wheel A prevent the retaining member 22 accommodated in the recessed portion 23 from moving in the circumferential direction, and the retaining member 22 and the pressing bolt 29 The abutment position is always maintained at an appropriate position, and the retaining member 22 is reliably eaten radially inward as the receiving pipe part 1 and the insertion pipe part 2 move relative to each other due to fluid pressure (water pressure). Can be moved.

  In addition, the partition wall 24 of the recess 23 is formed between adjacent bolt members 20A corresponding to the bolt insertion portion 20A of the specific portion formed with a small thickness, and further, the bolt insertion of the specific portion is inserted. Inward in the radial direction of the bolt insertion portion 20A formed with a small thickness by the distance between adjacent portions of the retaining member 22 corresponding to the portion 20A is made larger than the adjacent interval between the retaining members 22 in other parts. Since a relatively large distance can be ensured between the base portion on the side and the concave portion 23, the bolt 4A • Even if the arc-shaped recess 25 that secures the rotation operation space for operating the nut 4B is formed as a recess, it is possible to reliably and easily form a partition wall portion having a predetermined thickness between the arc-shaped recess 25 and the recess 23. it can.

  As shown in FIGS. 9 and 10, the width of each retaining member 22 in the tube axis direction is formed in a narrow width narrowing radially inwardly in the recess 23 and tiltable in the tube axis X direction. In addition, the outer surface 22a on the radially outer side of each retaining member 22 is formed in a flat arc-shaped surface in a cross-sectional view, and the tube axis X on the inner surface on the radially inner side of each retaining member 22 Triangular protrusion ridges 22b that are continuous in the circumferential direction are integrally formed at both ends in the direction.

  In the portion of the side surface 20b of the pusher wheel A that is displaced to the radially outer side of the bolt insertion portions 20A and 20B, the fastening tube 4 is tightened and fixed by the bolts 4A and nuts 4B. An abutting surface 30 that abuts from one side 1c of the connecting flange 1A from the tube axis X direction is formed to protrude.

[Second Embodiment]
In the first embodiment described above, an apparatus for preventing separation of a pipe joint for fastening and fixing the bolt insertion parts 20A, 20B of the pusher wheel A and the connecting flange 1A of the receiving pipe part 1 with six bolts 4A and nuts 4B, and Although the push wheel has been described, as shown in FIGS. 13 to 17, the bolt insertion portions 20A and 20B of the push wheel A and the connecting flange 1A of the receiving pipe portion 1 are fastened and fixed by four bolts 4A and nuts 4B. The technology of the present invention may be applied to a pipe joint detachment prevention device and a push ring.

  As shown in FIG. 17, the pusher wheel A of the second embodiment is formed in an annular shape with an inner diameter that is slightly larger than the outer diameter of the insertion tube portion 2. 2 metal retaining members 22 that are open toward the direction and can be moved from the radially outer side to the outer peripheral surface 2a of the insertion tube portion 2 can be stored and arranged along the circumferential direction. A circumferential groove-like recess 23 is formed.

  Of the bolt insertion portions 20A and 20B integrally formed at four locations on the outer peripheral surface of the pusher wheel A, two bolt insertion portions that are paired in the radial direction between the adjacent retaining members 22 accommodated in the recess 23 20A has a thickness in the tube axis direction (thickness from one side surface 20b to the other side surface 20c of the bolt insertion portion 20A) W1 of one side surface 20b of the connecting portion 20 facing the connecting flange 1A of the receiving tube portion 1. The thickness of the other two bolt insertion portions 20B in the direction of the tube axis X (thickness from one side surface 20b to the other side surface 20d of the bolt insertion portion 20B) W2 is set smaller than a common reference.

The adjacent interval of the retaining member 22 corresponding to both bolt insertion portions 20A of the specific part formed in the small thickness is configured to be larger than the maximum width W6 in the circumferential direction of the bolt insertion part 20A of the specific part. And a partition wall portion that prevents movement of the retaining member 22 in the circumferential direction between the retaining members 22 corresponding to both bolt insertion portions 20A of the specific portion of the recess 23 of the pusher wheel A. 24 is integrally formed.
The two concave portions 23 defined by the partition wall portion 24 are configured to be bilaterally symmetrical with a circumferential length that can accommodate one retaining member 22.

  As shown in FIG. 17, between the adjacent bolt insertion portions 20 </ b> A and 20 </ b> B of the pusher wheel A and portions corresponding to both circumferential ends of each retaining member 22 housed in the recess 23, A screw hole 28 is formed therethrough, and each screw hole 28 is provided with a pressing bolt 29 that bites and moves each of the retaining members 22 toward the radially inner side of the circumferential end.

Note that the cross-sectional shape of the second embodiment corresponding to the end view taken along the line VIII-VIII, the end view taken along the line IX-IX, and the end view taken along the line XX of FIG. The cross-sectional shape shown in FIGS. 8 to 10 of the first embodiment is substantially the same.
In addition, since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

[Third Embodiment]
In the first embodiment described above, an apparatus for preventing separation of a pipe joint for fastening and fixing the bolt insertion parts 20A, 20B of the pusher wheel A and the connecting flange 1A of the receiving pipe part 1 with six bolts 4A and nuts 4B, and Although the push wheel has been described, as shown in FIGS. 18 to 20, the bolt insertion portions 20A and 20B of the push wheel A and the connection flange 1A of the receiving pipe portion 1 are fastened and fixed by eight bolts 4A and nuts 4B. The technology of the present invention may be applied to a pipe joint detachment prevention device and a push ring.

  As shown in FIG. 20, the pusher wheel A of the third embodiment is formed in an annular shape with an inner diameter slightly larger than the outer diameter of the insertion tube portion 2. 8 metal retaining members 22 that are open toward the direction and that can move from the radially outer side to the outer peripheral surface 2a of the insertion tube portion 2 can be stored and arranged along the circumferential direction. A circumferential groove-like recess 23 is formed.

  Of the bolt insertion portions 20A, 20B integrally formed at eight locations on the outer peripheral surface of the pusher wheel A, two bolt insertion portions that are paired in the radial direction between adjacent ones of the retaining members 22 housed in the recess 23 The thickness (the thickness from one side surface 20b to the other side surface 20c of the bolt insertion portion 20A) W1 of 20A (hereinafter referred to as a bolt insertion portion of a specific portion) W1 is connected to the receiving tube portion 1. The thickness of the other six bolt insertion portions 20B in the tube axis X direction (from one side surface 20b to the other side surface 20d of the bolt insertion portion 20B) with the one side surface 20b facing the flange 1A as a common reference. The thickness is smaller than W2.

The adjacent interval of the retaining member 22 corresponding to both bolt insertion portions 20A of the specific part formed in the small thickness is larger than the adjacent interval of the retaining member 22 of the other part, and the bolt insertion of the specific part The retaining member 22 is configured to be substantially the same as or larger than the maximum width W6 in the circumferential direction of the portion 20A, and corresponds to the both bolt insertion portions 20A of the specific portion of the recess 23 of the pusher wheel A. A partition wall 24 for preventing the retaining member 22 from moving in the circumferential direction is integrally formed between the adjacent members.
The two concave portions 23 defined by the partition wall portion 24 are configured symmetrically with a circumferential length capable of accommodating the four retaining members 22 along the circumferential direction.

  As shown in FIG. 17, between the adjacent bolt insertion portions 20A and 20B of the pusher wheel A and in a portion corresponding to the central portion in the circumferential direction of each retaining member 22 housed in the recess 23, there is a radial direction. A screw hole 28 is formed therethrough, and each screw hole 28 is provided with a pressing bolt 29 that bites and moves each of the retaining members 22 toward the radially inward side in the circumferential center.

Note that the cross-sectional shape of the third embodiment corresponding to the end view taken along the line VIII-VIII, the end view taken along the line IX-IX, and the end view taken along the line XX of FIG. The cross-sectional shape shown in FIGS. 8 to 10 of the first embodiment is substantially the same.
In this 3rd Embodiment, the site | part corresponding to the other side surface 20c of both bolt insertion part 20A of the specific site | part formed in the outer peripheral surface of the press ring A corresponding to the both wall parts 24 for said partitions, and small thickness In addition, an arc-shaped recess 25 is formed around the bolt insertion hole 2a formed in the bolt insertion portion 20A at a specific portion so as to secure a rotation operation space for tightening the bolt 4A and the nut 4B with a rotation operation tool. However, the substantially U-shaped vertical groove portion 26 communicating with the bottom of the arc-shaped recess 25 described in the first embodiment is not formed.
In addition, since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

[Other Embodiments]
(1) In the above-described embodiment, the case where the pusher wheel A is integrally formed in an annular shape has been described. However, the pusher wheel A may be divided into a plurality of pieces in the circumferential direction.

  (2) In the above-described embodiment, the fastening means 4 for fastening and fixing the pusher wheel A and the receiving pipe portion 1 while relatively pulling them from the tube axis X direction is constituted by the bolt 4A and the nut 4B. In the case where a screw hole is formed in the receiving pipe portion 1, it may be constituted by this screw hole and a hexagon head bolt 4A.

  (3) In the above-described embodiment, the retaining member 22 is prevented from moving in the circumferential direction between the recesses 23 of the pusher wheel A and adjacent to the retaining member 22 corresponding to the both bolt insertion portions 20A of the specific part. Although the partition wall 24 is integrally formed, the partition wall 24 may be omitted, and the recess 23 may be formed in an annular shape.

(4) In the above-described embodiment, the connecting portion 20 of the pusher wheel A is configured from the semicircular or semi-circular bolt insertion portions 20A and 20B having the bolt insertion holes 20a formed so as to protrude at a plurality of locations in the circumferential direction. However, you may comprise from the connection flange which follows the annular | circular shape in the circumferential direction.
In the case of this connecting flange, bolt insertion portions 20A and 20B having bolt insertion holes 20a are formed at a plurality of locations in the circumferential direction of the connection flange, and between the adjacent retaining members 22 accommodated in the recess 23 of the presser wheel A. The thickness W1 in the tube axis direction of the two bolt insertion portions 20A that are paired in the radial direction at a specific portion is set as a common reference with one side surface 20b of the connecting portion 20 facing the connecting flange 1A of the receiving tube portion 1. The bolt insertion portion 20B at other locations is configured to be smaller than the thickness W2 in the tube axis X direction.
Therefore, in the case of a connection flange, the other side surface 20c side of the bolt insertion portion 20A at a specific portion is formed as a depression.
Moreover, as the bolt insertion part 20A of a specific part, the rotation surface for operating the seat surface with which the hexagonal head of the nut 4B or the bolt 4B contacts, and the hexagonal head of the nut 4B or the bolt 4B with a rotary operation tool ( The rotation operation area) is configured to have an area that can at least be secured.

  (5) In the above-described embodiment, the pressing bolt 29 is provided between the bolt insertion portions 20A and 20B so as to bite and move the retaining member 22 housed in the recess 23 toward the radially inward side. However, the pressing bolt 29 is omitted, the inner peripheral surface of the recess 23 is formed as an inclined surface having a smaller diameter toward the side farther from the connection flange 1A of the receiving pipe portion 1, and the retaining member The outer surface of 22 is also formed as an inclined surface that can be slidably contacted with the inner peripheral surface of the recess 23, and the retaining member 22 is moved in the radial direction as the receiving tube portion 1 and the inserting tube portion 2 move relative to each other. You may comprise so that it may bite and move inward.

A Push ring X Tube axis W1 Bolt insertion portion thickness W2 Bolt insertion portion thickness 1 Receptor tube portion 1a Inner peripheral surface 2 Insertion tube portion 2a Outer peripheral surface 3 Elastic seal material 4 Fastening means 4A Bolt 20 Connecting portion 20A Bolt insertion Part 20B Bolt insertion part 20a Bolt insertion hole 20b One side surface 22 Retaining member 23 Recess 24 Wall part 29 Pressing bolt 30 Contact surface

Claims (6)

An elastic sealing material capable of sealing between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion and an elastic sealing material that is inserted and connected to the receiving tube portion. Fastening means for covering a press ring that can be compressed to a sealed state by pressing from the axial direction, and fastening and fixing the connecting part of the press ring and the connecting flange of the receiving pipe part with a plurality of bolts from the axial direction of the pipe And a recess that is formed in the push ring and that opens inward in the radial direction is provided with a plurality of retaining members that can bite into the outer peripheral surface of the insertion tube portion. Because
Of the bolt insertion portions at a plurality of circumferential positions in the connecting portion of the push ring, the thickness of the bolt insertion portion corresponding to a specific portion between adjacent retaining members housed in the recess is determined in the tube axis direction. An apparatus for preventing separation of a pipe joint, wherein one side surface of the connecting part facing the connecting flange of the pipe part is configured to be smaller than the thickness of the other bolt insertion part in the tube axis direction. An elastic sealing material capable of sealing between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion and an elastic sealing material that is inserted and connected to the receiving tube portion. Fastening that presses from the axial direction and compresses a press ring that can be compressed to a sealed state, and fastens and fixes the connecting portion of the press ring and the connecting flange of the receiving pipe portion with at least four bolts from the axial direction of the tube The pipe joint is provided with means and at least two retaining members capable of biting into the outer peripheral surface of the insertion tube portion in a recess formed in the push ring and opening radially inward. Prevention device,
Of the at least four bolt insertion portions in the connecting portion of the press ring, two bolt insertion portions that are paired in the radial direction at a specific portion between adjacent retaining members housed in the recesses in the tube axis direction. Detachment of a pipe joint in which the thickness is made smaller than the thickness of the other bolt insertion part in the tube axis direction with respect to one side surface of the connecting part facing the connecting flange of the receiving pipe part Prevention device.   The wall part which prevents the movement in the circumferential direction of the said retaining member is formed between the adjoining of the said retaining member corresponding to the bolt insertion part formed in the said small thickness among the recessed parts of the said press ring. Item 3. An apparatus for preventing detachment of a pipe joint according to item 1 or 2.   The adjacent space | interval of the said retaining member corresponding to the bolt insertion part formed in the said small thickness is comprised in any one of Claims 1-3 comprised larger than the adjacent space | interval of the retaining member of another site | part. Detaching prevention device for the pipe joint as described.   The contact surface which contacts the connection flange of a receiving pipe part from a pipe axis direction is formed in one side surface used as a common standard of the connection part by bolting fixation operation of a bolt of the fastening means. The apparatus for preventing the separation of a pipe joint according to any one of 1 to 4.   It is the said press ring used for the detachment | desorption prevention apparatus of the pipe joint of any one of Claims 1-5, Comprising: Between the bolt insertion parts adjacent, the retaining member accommodated in the said recessed part is radial inside. A push ring for a fitting prevention device for a pipe joint, which is provided with a pressing bolt that bites and moves toward the side.

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