JP2008169868A - Removal preventing structure for pipe joint part, and locking portion large diameter modifying method for spigot pipe part and locking portion large diameter modifying tool for spigot pipe part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently and easily reform a large diameter locking portion greatly protruding radially outward in a cost advantageous manner by utilizing an existing locking protrusion for reasonable modification without the need for machining a spigot pipe part. <P>SOLUTION: On an outer peripheral face 2a of the spigot pipe part 2 to be inserted and connected to a socket pipe part 1, a large diameter locking body 10 is mounted radially inward, which protrudes radially outward from the locking protrusion 8 formed at the front end thereof for abutting on a lock ring 6 provided on an inner peripheral face 1a of the socket pipe part 1 in a direction of a pipe axial center X. An engagement fixing means 11 is mounted over between the large diameter locking body 10 and the front end of the spigot pipe part 2 in the state of abutting on the front end of at least the spigot pipe part 2 for fixing the large diameter locking body 10 to the outer peripheral face 2a of the spigot pipe part 2 in the state of abutting on the locking protrusion 8 in the direction of pipe axial center. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a detachment prevention technique for a pipe joint portion in which a locking protrusion for detachment prevention is formed at a distal end portion of an outer peripheral surface of an insertion tube portion that is inserted and connected to a receiving tube portion.

  As shown in FIG. 18, the pipe joint portion is prevented from detaching between the inner peripheral surface 1 a of the receiving tube portion 1 and the outer peripheral surface 2 a of the insertion tube portion 2. An annular space S is formed in which the lock ring 6 mounted in the surface mounting groove 1b can be inserted and removed along the tube axis X direction in a reduced diameter operation state. 1 between the lock ring 6 mounted in the mounting groove 1b and the push ring 4 which is pulled and fixed to the connecting flange portion 1A of the receiving pipe portion 1 via bolts 5c and nuts 5d. Is provided with a backup ring 7 that presses against the bottom surface of the mounting groove 1b, and an elastic seal material (rubber ring) 3 that is compressed by the pusher wheel 4, and is integrally formed at the distal end of the insertion tube part 2. The locking protrusion 30 is attached to the mounting groove 1b of the receiving pipe portion 1 with the locking protrusion 30. Large projecting margin against which those possible from the pipe axis X direction with respect to the grayed 6 (e.g., nominal diameter 9mm in the case of 150 mm) there is what is known as a so-called SII type formed in.

This SII type anti-separation structure is poor in workability due to the fact that the pusher wheel 4 is pulled and fixedly connected by a large number of bolts 5c and nuts 5d. At present, one-touch fitting and connection work is possible instead. The next NS type has become the mainstream and widely used.
As shown in FIG. 19, the NS-type separation preventing structure includes a first mounting groove 32 for mounting an elastic sealing material 31 on the inner peripheral surface 1a of the receiving pipe portion 1, a centering elastic ring 33, and An annular space between the inner peripheral surface of the receiving tube portion 1 and the outer peripheral surface of the insertion tube portion 2 is formed with a second mounting groove 35 for mounting a lock ring 34 that can be elastically deformed on the enlarged diameter side. The radial dimension of S is configured such that the elastic sealing material 31 can be compressed into a sealed state when the insertion tube portion 2 is inserted, and the protrusion margin of the locking projection 8 of the insertion tube portion 2 is set to the lock. The minimum protrusion amount (for example, 3 mm when the nominal diameter is 150 mm) is set so that the passage resistance of the elastic sealing material 31 is as small as possible within the range in which the separation preventing function by the engagement with the ring 34 can be maintained.

  In this NS type separation preventing structure, the insertion tube portion 2 only needs to be inserted and connected to the receiving tube portion 1 from the tube axis X direction. When the center of gravity of the tube itself is deviated in the diametrical direction with respect to the tube axis X at the connection position of the two tube portions 1 and 2, such as a bent tube, the tip of the insertion tube portion 2 is It is easy to be inserted in a state of being inclined with respect to the tube axis X of the receiving tube portion 1, and this contact may require more time for connection work than in the case of the SII type separation preventing structure.

  Further, in the NS-type separation preventing structure, when disassembling the connected receiving tube portion 1 and the insertion tube portion 2, a sheet pile having the same thickness as the protruding margin of the locking projection 8 is inserted into the insertion tube. It is necessary to drive to the locking projection 8 between the outer peripheral surface 2a of the tube portion 2 and the elastic seal material 31 and between the outer peripheral surface 2a of the insertion tube portion 2 and the lock ring 34. Since it has to be driven at a plurality of positions in the circumferential direction of S, it is easy to take time for the disassembling work. In particular, in the case of a bent tube, there is a possibility that a sheet pile cannot be driven.

For this reason, it is desirable to adopt a SII-type detachment preventing structure that is practically abandoned in pipes that place importance on bent pipes and dismantling. However, the receiving pipe section 1 and the insertion pipe section 2 are used. In order to increase the cost when newly manufacturing both, the NS-type inlet tube portion 2 is modified and used as the mainstream and widely used NS-type inlet tube portion 2. Is desired.

  Conventionally, when remodeling the NS-shaped insertion tube portion 2 into the SII-type insertion tube portion 2, the tube portion including the locking projection 8 is cut and removed from the insertion tube portion 2 in a ring-shaped state. After that, an annular mounting groove is formed at the protrusion forming position of the outer peripheral surface 2a of the insertion tube portion 2, and a lock ring 34 provided on the inner peripheral surface 1a of the SII-type receiving tube portion 1 is formed in this mounting groove. Is provided with a projection allowance that can be contacted from the tube axis X direction, and fitted with a locking ring that can be expanded in diameter and cut at one circumferential direction, and both ends of the locking ring are joined together. (See Patent Document 1).

Japanese Patent Laid-Open No. 9-178053

  In the conventional remodeling method, after the tube portion including the locking projection 8 is cut and removed from the insertion tube portion 2 in a ring shape, an annular attachment groove is formed at the protrusion formation position on the outer peripheral surface of the insertion tube portion 2. For example, a plurality of processings are required for the insertion tube portion 2 itself, and the entire heavy tube including the insertion tube portion 2 needs to be moved along with the processing. It took a lot of work to remodel the locking part of the large diameter.

  The present invention has been made in view of the above-described actual situation, and its main problem is that it does not require processing for the intubation tube portion, and the radial direction can be obtained by rational modification using existing locking projections. Detachment prevention structure for pipe joints and large diameter remodeling method for locking part of insertion tube part that can be efficiently and easily remodeled to large diameter locking part with large outward protrusion And it is in the point which provides the latching | locking part large diameter remodeling tool for insertion tube parts.

A first characteristic configuration according to the present invention is a detachment preventing structure for a pipe joint portion in which a locking protrusion for preventing detachment is formed at a distal end portion of an outer peripheral surface of an insertion tube portion inserted and connected to a receiving tube portion. There,
Projects radially outward from the locking projection on the outer peripheral surface of the insertion tube portion, and can contact the lock ring provided on the inner peripheral surface of the receiving tube portion from the tube axis direction. A large-diameter locking body is mounted from the outside in the radial direction, and the large-diameter locking body is mounted in a state of being engaged with at least the distal end portion of the insertion tube section across the large diameter locking body and the distal end portion of the insertion tube section. Thus, there is provided an engagement fixing means for fixing the large-diameter locking body to the outer peripheral surface of the insertion tube portion in a state in which the large-diameter locking body can be brought into contact with the locking protrusion from the tube axis direction.

  According to the above-described characteristic configuration, the separation protrusion for preventing separation formed at the distal end portion of the outer peripheral surface of the insertion tube portion is changed to a large-diameter engagement portion having a larger amount of protrusion outward in the radial direction. To remodel, after mounting a large-diameter locking body that protrudes radially outward from the locking projection on the outer peripheral surface of the insertion tube portion from the radial outside, the large-diameter locking body and By mounting the engagement fixing means over the distal end portion of the insertion tube portion, the large-diameter locking body can be inserted into the insertion tube portion in a state in which it can abut against the locking projection of the insertion tube portion from the tube axis direction. The large-diameter locking body is fixed to the outer peripheral surface of the mouth tube portion, and when the tensile force is applied due to an earthquake or non-uniform subsidence, the large-diameter locking body is engaged with the locking projection of the insertion tube portion and the inner peripheral surface of the receiving tube portion. It can contact | abut with the lock ring provided in the tube axis direction, and the relative detachment | moving movement of the said receiving tube part and an insertion tube part can be blocked | prevented strongly.

Moreover, since the large-diameter locking body is mounted in a state of being engaged with at least the distal end portion of the insertion tube section across the large-diameter locking body and the distal end portion of the insertion tube section, for example, the large-diameter locking body is inserted into the insertion tube. When the insertion tube portion is inserted into and connected to the receiving tube portion, as in the case where it is movably mounted on the outer peripheral surface of the receiving portion, the large-diameter locking body contacts the lock ring of the receiving tube portion. It is possible to reliably avoid being held on the tube end side of the receiving tube portion by contact, and the large-diameter locking body is formed between the locking projection of the insertion tube portion and the receiving tube portion. It is possible to suppress torsional deformation of the large-diameter locking body when pinched with the lock ring.

  Therefore, when remodeling the locking projection formed at the distal end portion of the outer peripheral surface of the insertion tube portion into a large-diameter locking portion having a larger amount of radial outward protrusion than the insertion projection, Without requiring any processing on the at least the distal end portion of the insertion tube portion over the distal end portion of the insertion tube portion and the large-diameter locking body attached to the insertion tube portion using the existing locking projection. By rational modification such as mounting the engagement fixing means in the engaged state, it is possible to efficiently and easily modify the large-diameter locking portion efficiently and cost-effectively.

  According to a second characteristic configuration of the present invention, when the engaging and fixing means is mounted over the large-diameter locking body and the distal end portion of the insertion tube portion, the large-diameter locking body is tubed to a locking projection. It is the point which is the structure fixed to the outer peripheral surface of an insertion tube part in the state contact | abutted from the axial direction.

  According to the above characteristic configuration, for example, the large-diameter locking body is larger than the case where the large-diameter locking body is fixed to the outer peripheral surface of the insertion tube portion with a gap between the large-diameter locking body and the locking projection. In addition, it is possible to suppress deformation and breakage of the engaging and fixing means at the time of a collision with the lock ring of the receiving pipe portion, and to make the large-diameter locking body and the engaging and fixing means compact in the tube axis direction. can do.

  According to a third characteristic configuration of the present invention, the engagement fixing means includes a first engagement portion that abuts at least a distal end surface of the distal end portion of the insertion tube portion from the tube axis direction, and the large diameter engagement portion. It is in the point comprised from the engagement fixing member provided with the 2nd engagement part engaged with the engagement receiving part formed in the stop.

  According to the above characteristic configuration, the first engagement portion of the engagement fixing member constituting the engagement fixing means is engaged (contacted) with the distal end surface of the distal end portion of the insertion tube portion, and the engagement is fixed. By engaging the second engagement portion of the member with the engagement receiving portion of the large-diameter locking body attached to the insertion tube portion, the large-diameter locking body is against the engagement protrusion of the insertion tube portion. Then, it is fixed to the outer peripheral surface of the insertion tube portion in a state where it can be contacted from the tube axis direction. At this time, since the first engaging portion comes into contact with the distal end surface of the insertion tube portion from the tube axis direction, an antirust effect on the distal surface of the insertion tube portion can be obtained.

  According to a fourth characteristic configuration of the present invention, at least the first engagement portion of the engagement fixing member covers the insertion projection of the insertion tube portion with respect to the locking projection of the insertion tube portion from the tube axis direction. It is in the point comprised by the cylinder shape with an annular bottom which can contact | abut at least with respect to the front-end | tip surface in a front-end | tip part from a pipe-axis core direction.

According to the above characteristic configuration, when only the first engagement portion of the engagement fixing member is formed in a cylindrical shape with an annular bottom, not only the distal end surface of the insertion tube portion but also the outer peripheral surface of the locking projection. In addition, the large-diameter locking body can be fixed to the outer peripheral surface of the insertion tube portion while facilitating the engagement mounting of the engagement fixing member to the distal end portion of the insertion tube portion. Function can be enhanced.
Further, in the case where the entire engagement fixing member including the first engagement portion and the second engagement portion is configured in a cylindrical shape with an annular bottom, not only the distal end surface of the insertion tube portion but also the locking protrusion In addition, it is possible to obtain a rust-preventing effect on the outer peripheral surface and the outer peripheral surface of the engagement receiving portion of the large-diameter locking body, and simultaneously improve the fixing function of the large-diameter locking body on the outer peripheral surface of the insertion tube portion. it can.

According to a fifth characteristic configuration of the present invention, a circumferential width of the engagement fixing member is configured to be a small width equal to or less than half of an outer peripheral length at a distal end portion of the insertion tube portion. Is engaged with the engagement receiving portion of the large-diameter locking body and the distal end portion of the insertion tube portion, so that the large-diameter locking body abuts against the locking projection from the tube axis direction. It exists in the point which is the structure fixed to the outer peripheral surface of an insertion tube part in the possible state.

  According to the above-described characteristic configuration, the large-diameter locking is performed on the outer peripheral surface of the insertion tube portion with the plurality of engagement fixing members configured to be a width that is less than half of the outer peripheral length of the distal end portion of the insertion tube portion. Since the body is fixed, the engagement with the engagement receiving portion of the large-diameter locking body and the distal end portion of the insertion tube portion is smaller than in the case where the entire engagement fixing member is formed in a cylindrical shape with an annular bottom. Although the number of combined mounting increases, each engagement mounting operation can be easily performed with little effort.

  According to a sixth characteristic configuration of the present invention, the second engagement portion of the engagement fixing member can be elastically deformed radially outwardly than the engagement receiving portion of the large-diameter locking body, and It is the point which is the structure engaged with the said engagement receiving part, reducing a diameter from the diameter expansion operation state.

  According to the above characteristic configuration, the engagement with the distal end portion of the insertion tube portion is achieved by engaging the engagement receiving portion of the large-diameter locking body with the elastic restoring force of the second engagement portion of the engagement fixing member. The fixing function of the large-diameter locking body with respect to the outer peripheral surface of the insertion tube portion can be enhanced while facilitating the engagement mounting of the joint fixing member.

According to a seventh characteristic configuration of the present invention, the engagement receiving portion of the large-diameter locking body is provided with one or a plurality of engagement protrusions in the circumferential direction constituting the second engagement portion of the engagement fixing member. When there is a rotation guide path that guides relative rotation around the tube axis and the engagement protrusion at a specific position in the rotation direction of the rotation guide path, the engagement protrusion is allowed to be inserted and removed in the tube axis direction. When the engaging protrusion is at the engaging recess that is deviated from the specific position of the rotation guide path and the engaging holding position that is deviated in the circumferential direction, the engaging protrusion is prevented from being inserted and removed in the tube axis direction. The engagement wall portion is formed.
According to the characteristic configuration described above, the detachment formed on one or a plurality of engagement protrusions and the engagement receiving portion of the large-diameter locking body in the circumferential direction constituting the second engagement portion of the engagement fixing member When the concave portion is in a specific phase opposite to each other in the tube axis direction, the engagement fixing member is moved closer to the large-diameter locking body attached to the insertion tube portion from the tube axis direction. The engagement protrusion of the engagement fixing member is engaged with the rotation guide path through the detachable recess of the engagement receiving portion of the large diameter locking body, and in this state, the engagement fixing member and the large diameter locking body are connected to the tube. When the engagement protrusion is positioned in the engagement holding position that is biased in the circumferential direction from the specific position of the rotation guide path by performing a relative rotation operation around the axis, the engagement protrusion of the engagement fixing member and the large-diameter engagement The engagement wall portion of the body is in an engaged and fixed state in which relative movement in the tube axis direction is prevented.

  Therefore, the engaging protrusion of the engaging fixing member is pushed into the tube core direction with respect to the detachable recess of the large-diameter locking body attached to the insertion tube portion, and is engaged only by rotating it by a predetermined angle. For example, when disassembling, it is only necessary to pull out the engagement protrusion of the engagement fixing member by a predetermined angle with respect to the large-diameter locking body. Compared with the case where the engagement receiving portion of the large-diameter locking body is engaged with the elastic restoring force of the two engaging portions, the engagement connection work and the disassembly work of the large-diameter locking body and the engagement fixing member are performed. It can be done quickly and easily.

  According to an eighth characteristic configuration of the present invention, an elastic ring for centering is provided in a mounting groove on an inner peripheral surface of the receiving tube portion when the inserting tube portion is inserted into and connected to the engaging fixing member. A cam that abuts against a lock ring that is mounted so as to be capable of expanding and deforming through a tube axis from the tube axis direction, and that expands and deforms the lock ring to an inner diameter through which the engagement fixing member and the large-diameter locking body can pass. The surface is formed.

According to the above-mentioned characteristic configuration, centering in the mounting groove formed on the inner peripheral surface of the receiving pipe part using the wide internal space of the receiving pipe part before the insertion pipe part is inserted. Even under the condition that a lock ring that can be expanded and deformed via an elastic ring is mounted in advance, the insertion tube portion in which the large-diameter locking body and the engagement fixing member are assembled is inserted into the reception tube portion. Then, with this insertion, the cam surface formed on the engagement fixing member comes into contact with the lock ring, and the diameter of the lock ring is increased to an inner diameter through which the engagement fixation member and the large-diameter locking body can pass. Since it can be deformed, the insertion and connection work of the insertion tube portion with respect to the receiving tube portion can be performed efficiently and easily.

  According to a ninth feature of the present invention, in the large-diameter locking body, a lock ring that is detachably attached to an attachment groove on an inner peripheral surface of the receiving tube portion is contacted from the tube axis direction. The part exists in the point formed in the inclined surface which becomes large diameter as the front-end | tip part side of the said insertion tube part.

  According to the above characteristic configuration, when a tensile force due to an earthquake, uneven settlement or the like acts, the inclined surface of the large-diameter locking body comes into contact with the lock ring of the receiving pipe portion from the pipe axis direction. Since the large-diameter locking body is strongly pressed against the outer peripheral surface and the locking projection of the insertion tube portion, the lock ring is strongly pressed against the bottom surface side of the mounting groove of the reception tube portion. And the relative separation movement between the insertion tube portion and the insertion tube portion can be strongly prevented.

  A tenth characteristic configuration according to the present invention is that the large-diameter locking body is configured in a ring shape that is elastically deformable in a diameter-enlarging direction that is cut at one place in the circumferential direction.

  According to the above characteristic configuration, when the large-diameter locking body is mounted on the outer peripheral surface of the insertion tube portion, the large-diameter locking body is elastically deformed to have a larger diameter than the locking protrusion or the locking protrusion. It is inserted from the tube axis direction while elastically deforming toward the diameter-expanding side along the cam surface of the distal end of the tube, and when it passes through the locking projection, the diameter is reduced by the elastic restoring force of the large-diameter locking body. The large-diameter locking body can be mounted on the outer peripheral surface of the insertion tube portion from the outside in the radial direction, and the mounting structure of the large-diameter locking body can be simplified.

  An eleventh characteristic configuration according to the present invention is that the large-diameter locking body is composed of a divided large-diameter locking body divided into a plurality of parts in the circumferential direction.

  According to the above characteristic configuration, the number of connections between the divided large-diameter locking bodies mounted on the outer peripheral surface of the insertion tube portion is increased, and the labor required for mounting to the large-diameter locking body is reduced. Can be achieved.

According to a twelfth characteristic configuration of the present invention, an engagement protrusion for preventing separation formed at the distal end portion of the outer peripheral surface of the insertion tube portion inserted and connected to the reception tube portion is projected outward in the radial direction. Is a method of remodeling into a large large-diameter locking part,
Projects radially outward from the locking projection on the outer peripheral surface of the insertion tube portion, and can contact the lock ring provided on the inner peripheral surface of the receiving tube portion from the tube axis direction. A large-diameter locking body is mounted from outside in the radial direction, and the large-diameter locking body and the distal end portion of the insertion tube portion are engaged with at least the distal end portion of the insertion tube portion. By mounting a fixing member, the large-diameter locking body is fixed to the outer peripheral surface of the insertion tube portion in a state in which the large-diameter locking body can come into contact with the locking protrusion from the tube axis direction. is there.

According to the above-described characteristic configuration, the separation protrusion for preventing separation formed at the distal end portion of the outer peripheral surface of the insertion tube portion is changed to a large-diameter engagement portion having a larger amount of protrusion outward in the radial direction. To remodel, after mounting a large-diameter locking body that protrudes radially outward from the locking projection on the outer peripheral surface of the insertion tube portion from the radial outside, the large-diameter locking body and By mounting the engagement fixing means over the distal end portion of the insertion tube portion, the large-diameter locking body can be inserted into the insertion tube portion in a state in which it can abut against the locking projection of the insertion tube portion from the tube axis direction. The large-diameter locking body is fixed to the outer peripheral surface of the mouth tube portion, and when the tensile force is applied due to an earthquake or non-uniform subsidence, the large-diameter locking body is engaged with the locking projection of the insertion tube portion and the inner peripheral surface of the receiving tube portion. It can contact | abut with the lock ring provided in the tube axis direction, and the relative detachment | moving movement of the said receiving tube part and an insertion tube part can be blocked | prevented strongly.

  In addition, since the engagement fixing means is mounted over the large-diameter locking body and the distal end portion of the insertion tube portion so as to engage with at least the distal end portion of the insertion tube portion, As in the case where a stopper is movably attached to the outer peripheral surface of the insertion tube portion, the large-diameter locking body is connected to the reception tube portion when the insertion tube portion is inserted into the reception tube portion. It is possible to reliably avoid being held closer to the tube end side of the receiving tube portion than that due to contact with the lock ring, and the large-diameter locking body is a locking projection of the insertion tube portion. And the torsional deformation of the large-diameter engaging body when being pinched between the lock ring of the receiving pipe portion.

  Therefore, when remodeling the locking projection formed at the distal end portion of the outer peripheral surface of the insertion tube portion into a large-diameter locking portion having a larger amount of radial outward protrusion than the insertion projection, Without requiring any processing on the at least the distal end portion of the insertion tube portion over the distal end portion of the insertion tube portion and the large-diameter locking body attached to the insertion tube portion using the existing locking projection. By the rational assembly method of mounting the engagement fixing means in the engaged state, it is possible to efficiently and easily remodel the large-diameter locking portion efficiently and cost-effectively.

A thirteenth characteristic configuration according to the present invention has a large-diameter large protrusion amount in the radially outward direction at the distal end portion of the outer peripheral surface of the insertion tube portion inserted and connected to the reception tube portion. A remodeling tool that modifies the locking part,
It can be mounted from the radially outer side in a state of projecting radially outward from the locking projection with respect to the outer peripheral surface of the insertion tube portion, and in the mounted state on the inner peripheral surface of the receiving tube portion A large-diameter locking body capable of coming into contact with the provided lock ring from the tube axis direction, and at least the distal end portion of the insertion tube section across the large-diameter locking body and the distal end portion of the insertion tube section The engagement fixing member that fixes the large-diameter locking body to the outer peripheral surface of the insertion tube portion in a state in which the large-diameter locking body can be brought into contact with the locking protrusion from the tube axis direction. It is in the point with and.

  According to the above-described characteristic configuration, the separation protrusion for preventing separation formed at the distal end portion of the outer peripheral surface of the insertion tube portion is changed to a large-diameter engagement portion having a larger amount of protrusion outward in the radial direction. To remodel, after mounting a large-diameter locking body that protrudes radially outward from the locking projection on the outer peripheral surface of the insertion tube portion from the radial outside, the large-diameter locking body and By mounting the engagement fixing means over the distal end portion of the insertion tube portion, the large-diameter locking body can be inserted into the insertion tube portion in a state in which it can abut against the locking projection of the insertion tube portion from the tube axis direction. The large-diameter locking body is fixed to the outer peripheral surface of the mouth tube portion, and when the tensile force is applied due to an earthquake or non-uniform subsidence, the large-diameter locking body is engaged with the locking projection of the insertion tube portion and the inner peripheral surface of the receiving tube portion. It can contact | abut with the lock ring provided in the tube axis direction, and the relative detachment | moving movement of the said receiving tube part and an insertion tube part can be blocked | prevented strongly.

  In addition, since the engagement fixing means is mounted in a state of being engaged with at least the distal end portion of the insertion tube portion across the large diameter locking body and the distal end portion of the insertion tube portion, for example, the large diameter engagement As in the case where the body is movably mounted on the outer peripheral surface of the insertion tube portion, the large-diameter locking body is connected to the reception tube portion when the insertion tube portion is inserted into the reception tube portion. It is possible to reliably avoid being held closer to the tube end side of the receiving tube portion due to contact with the lock ring, and the large-diameter locking body is connected to the locking projection of the insertion tube portion. The torsional deformation of the large-diameter locking body when pressed with the lock ring of the receiving tube portion can be suppressed.

Therefore, when remodeling the locking projection formed at the distal end portion of the outer peripheral surface of the insertion tube portion into a large-diameter locking portion having a larger amount of radial outward protrusion than the insertion projection, Without requiring any processing on the at least the distal end portion of the insertion tube portion over the distal end portion of the insertion tube portion and the large-diameter locking body attached to the insertion tube portion using the existing locking projection. With a rational modification tool such as mounting the engagement fixing means in an engaged state, the large-diameter locking portion can be efficiently and easily modified with an advantage in terms of cost.

[First Embodiment]
FIGS. 1 to 8 show a structure for preventing the detachment of a pipe joint part used in a piping system of a fluid pipe such as a water pipe or a gas pipe, a method for remodeling a locking part of the inlet pipe part 2, and a method for the inlet pipe part. Shows the stop large diameter remodeling tool.
The structure for preventing the separation of the pipe joint is formed in the other fluid pipe P that is inserted and connected from the pipe axis X direction to the SII type cast iron receiving pipe part 1 formed in one fluid pipe P. The NS-shaped cast iron insertion tube portion 2 is made of synthetic rubber capable of sealing between the large-diameter inner peripheral surface 1a of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 (for example, , Styrene butadiene rubber) sealing material (hereinafter referred to as an elastic sealing material) 3 and an example of an annular member fixedly connected to the end of the receiving tube 1 in a state of being fitted to the insertion tube 2 Then, the elastic seal member 3 is pressed from the direction of the tube axis X to be compressed into a sealed state (watertight state). Between the connecting flange portion 1A of the mouth tube portion 1, the pusher wheel 4 and the receiving tube portion 1 are relatively drawn from the tube axis X direction. A fastener 5 for fastening and fixing is provided. The elastic seal member 3, the presser wheel 4, and the fastener 5 are used to oppose the outer peripheral surface 2 a of the insertion tube portion 2 and the large-diameter inner peripheral surface 1 a of the receiving tube portion 1. A sealing means A for sealing between the surfaces is configured.

  As shown in FIGS. 1 and 5, the fastener 5 includes bolt insertion holes 5 a formed at a plurality of locations in the circumferential direction of the connection flange portion 1 </ b> A of the receiving tube portion 1, and a connection flange portion 4 </ b> A of the press ring 4. Among the bolt insertion holes 5b formed at a plurality of locations in the circumferential direction, a T-shaped bolt 5c inserted across the bolt insertion holes 5a, 5b facing each other in the tube axis X direction, and a protruding screw portion of the bolt 5c And the tube shaft core of the pusher wheel 4 by the relative proximity movement of the pusher wheel 4 and the receiving tube part 1 in the tube shaft core X direction in accordance with the tightening operation of the bolt 5c and nut 5d. The elastic sealing material 3 is compressed and deformed by the seal pressing portion 4a formed at one end portion in the X direction, and between the opposed surfaces of the outer peripheral surface 2a of the insertion tube portion 2 and the large-diameter inner peripheral surface 1a of the receiving tube portion 1 At the same time as the pressure of the elastic sealing material 3 is compressed. It holds retaining the connection state and the receiver pipe portion 1 and the inserted pipe section 2.

  Of the large-diameter inner peripheral surface 1a of the receiving tube portion 1, an annular mounting groove 1b formed in the vicinity of the tip of the elastic sealing material 3 mounted in a sealed state has one circumferential direction. A metal lock ring 6 having a substantially C-shape that can be elastically deformed to the cut diameter side and having an outer diameter that is the same as or slightly larger than the inner diameter of the mounting groove 1b in the natural state. It is installed.

  The lock ring 6 is connected to the outside through the annular space S between the large-diameter inner peripheral surface 1a of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 while being in a reduced diameter state separated from the mounting groove 1b. In other words, the radial dimension of the annular space S is reduced so that the lock ring 6 can be inserted and removed in the tube axis X direction. Between the tip of the elastic sealing material 3 mounted in the sealed state and the lock ring 6, there is one circumferential direction pressed against the lock ring 6 from the tube axis X direction by the pushing force of the elastic sealing material 3. A backup ring 7 made of resin cut obliquely is provided.

  A taper-shaped cam surface that presses the lock ring 6 against the bottom surface side of the mounting groove 1b as the backup ring 7 is pushed toward the back of the pipe at the opposite contact portion between the backup ring 7 and the lock ring 6. 7a and 6a are formed, and at both ends of the lock ring 6, as shown in FIG. 6, engagement operation grooves 6b for diameter reduction operation with which the tip of the ring restrictor 15 is engaged are formed. ing.

As shown in FIGS. 2 and 19, the insertion tube portion 2 is provided with a first attachment groove 32 in which an elastic sealing material 31 is attached, a centering elastic ring 33, and a lock ring 34 capable of expanding and deforming. It corresponds to the NS-type receiving pipe portion 1 in which the second mounting groove 35 is formed. The distal end portion of the outer peripheral surface 2 a of the insertion pipe portion 2 is attached to the second mounting groove 35. Further, an annular locking projection 8 for preventing detachment that can come into contact with the lock ring 34 from the tube axis direction X is integrally formed.

  As shown in FIG. 2 and FIG. 19, the elastic sealing material 31 is compressed radially outward at the front end side corner of the locking projection 8 when inserted into the NS-shaped receiving tube portion 1. A cam surface 8a is formed for passing through the lock ring 34 while expanding the diameter against the elastic restoring force of the lock ring 34 and the elastic restoring force of the centering elastic ring 33. An annular back surface 8b of the stop projection 8 is formed at right angles to the outer peripheral surface 2a of the insertion tube portion 2, and an outer peripheral surface 8c positioned between the cam surface 8a and the annular back surface 8b is a tube axis. It is formed on a circumferential surface parallel to the core X.

  As shown in FIGS. 1 and 8, the outer diameter of the locking projection 8 of the insertion tube portion 2 is smaller than the inner diameter of the lock ring 6 mounted in the mounting groove 1 b of the SII-type receiving tube portion 1. Therefore, it is necessary to remodel the locking projection 8 into the large-diameter locking portion B having a large radial outward protrusion amount. In the separation preventing structure of the present invention, the locking projection 8 is formed on the outer peripheral surface 2a of the inlet tube portion 2. The metal large diameter that protrudes outward in the radial direction from the locking projection 8 and is capable of coming into contact with the lock ring 6 mounted in the mounting groove 1b of the receiving pipe portion from the tube axis X direction. The locking body 10 is mounted from the outside in the radial direction, and is engaged and mounted by an elastic force over the engagement receiving portion 10A formed on the large-diameter locking body 10 and the distal end portion of the insertion tube portion 2. In the state where the large-diameter locking body 10 is in contact with the annular back surface 8b of the locking projection 8 from the tube axis X direction, Rubber or synthetic resin or metal engagement fixing means 11 are provided for securing the peripheral surface 2a.

  The large-diameter locking body 10 is a ring shape that is elastically deformed in the diameter-expanding direction, which is cut at one place in the circumferential direction, and the inner diameter thereof is the same as the outer diameter of the outer peripheral surface 2a of the inlet tube portion 2 in a natural state. An engagement groove 10a constituting the engagement receiving portion 10A is formed on the outer peripheral surface of the large-diameter locking body 10, and the engagement groove 10a is formed on the outer peripheral surface of the large-diameter locking body 10. The outer diameter of the peripheral wall portion 10c positioned on the distal end side of the insertion tube portion 2 is larger than the outer diameter of the locking projection 8 and is positioned on the opening side of the receiving tube portion in the engagement groove 10a. It is comprised smaller than the outer diameter of the engagement surrounding wall part 10d.

  Therefore, when the large-diameter locking body 10 is attached to the outer peripheral surface 2a of the insertion tube portion 2, the large-diameter locking body 10 is elastically deformed to have a larger diameter than the locking protrusion 8 or Inserted from the tube axis X direction while elastically deforming toward the diameter-expanding side along the cam surface 8a on the distal end side of the locking projection 8, and when passing through the annular back surface 8b of the locking projection 8, By reducing the diameter by the elastic restoring force of the body 10, the large-diameter locking body 10 is attached to the outer peripheral surface 2 a of the insertion tube portion 2 from the outside in the radial direction.

  Further, as shown in FIGS. 2 and 3, the inner diameter of the large-diameter locking body 10 is set to the insertion tube portion over the thin connecting end portions 10 e formed at both ends in the circumferential direction of the large-diameter locking body 10. The connecting piece 12 for maintaining the same mounting diameter as the outer diameter of the outer peripheral surface 2a of the two is fixedly connected by caulking of the rivet 13 inserted from the inner peripheral surface side of the connecting end portion 10, and Of the large-diameter locking body 10, a portion that comes into contact with the lock ring 6 detachably attached to the mounting groove 1 b of the large-diameter inner peripheral surface 1 a of the receiving tube portion 1 from the tube axis X direction. The tip end portion of the insertion tube portion 2 is formed on a tapered inclined surface 10b having a larger diameter.

And as shown in FIG. 8, the tensile force resulting from an earthquake, uneven settlement, etc. acts, and the inclined surface 10b of the said large diameter locking body 10 is provided in the large diameter inner peripheral surface 1a of the receiving pipe part 1. As shown in FIG. The large-diameter locking body 10 is strongly pressed against the outer peripheral surface 2a of the insertion tube portion 2 and the annular back surface 8b of the locking projection 8 when the lock ring 6 is brought into contact with the tube axis X direction. Since the lock ring 6 is strongly pressed against the bottom surface side of the mounting groove 1b of the receiving tube portion 1, relative movement between the receiving tube portion 1 and the insertion tube portion 2 can be strongly prevented.

  The engagement fixing means 11 is inserted from the distal end surface 2b and inner peripheral surface 2c at the distal end portion of the insertion tube portion 2 and the cam surface 8a and outer peripheral surface 8c of the locking projection 8 from the tube axis X direction. A first engaging portion 11a that contacts (contacts) in a close contact state, and a second engaging portion 11b that engages with the engaging groove 10a of the large-diameter locking body 10 from the outside in the radial direction. The first and second engaging portions 11a and 11b of the engaging and fixing member 11 include the engaging protrusion 8 and the large-diameter engaging member of the insertion tube portion 2. The tube 10 is configured in a cylindrical shape with an annular bottom that covers the engagement receiving portion 10A of the body 10 from the direction of the tube axis X.

  Then, the first engagement portion 11 a of the engagement fixing member 11 is engaged with the distal end portion of the insertion tube portion 2, and the second engagement portion 11 b of the engagement fixation member 11 is connected to the insertion tube portion 2. The large-diameter locking body 10 is engaged with the engagement groove 10a of the engagement receiving portion 10A of the mounted large-diameter locking body 10 so that the large-diameter locking body 10 is an annular back surface 8b of the locking projection 8 of the insertion tube portion 2. And is fixed to the outer peripheral surface 2a of the insertion tube portion 2 in a state in which the tube can be contacted from the tube axis X direction, and the first engagement portion 11a is a distal end surface of the distal end portion of the insertion tube portion 2 2b and the inner peripheral surface 2c and the cam surface 8a of the locking projection 8 are in close contact with each other, so that a rust prevention effect is obtained at the distal end portion of the inlet tube portion 2 including the cam surface 8a of the locking projection 8. Can do.

  The second engagement portion 11b of the engagement fixing member 11 can be elastically deformed radially outward from the peripheral wall portion 10c, which is a component member of the engagement receiving portion 10A of the large-diameter locking body 10, and The outer diameter of the outer peripheral surface 11c of the engagement fixing member 11 is large while being configured to engage with the engagement groove 10a of the engagement receiving portion 10A while reducing the diameter from the expanded diameter operation state. The second engagement portion 11b of the engagement fixing member 11 is formed in the engagement groove 10a of the large-diameter locking body 10 with the same outer diameter as the outer peripheral surface of the engagement peripheral wall portion 10d of the diameter locking body 10. In the engaged state, the outer peripheral surface 11c of the engagement fixing member 11 and the outer peripheral surface of the engagement peripheral wall portion 10d of the large-diameter locking body 10 are configured to be flush with each other.

  Then, by engaging the engagement groove 10a of the engagement receiving portion 10A of the large-diameter locking body 10 with the elastic restoring force of the second engagement portion 11b of the engagement fixing member 11, the inlet tube portion 2 The fixing function of the large-diameter locking body 10 to the outer peripheral surface 2a of the insertion tube portion 2 can be enhanced while facilitating the engagement and mounting of the engagement fixing member 11 to the distal end portion of the insertion tube portion 2.

  Also, the locking part large-diameter remodeling tool for the insertion tube part which is another embodiment of the present invention, that is, the distal end portion of the outer peripheral surface 2a of the insertion tube part 2 inserted and connected to the receiving tube part 1 The remodeling tool of the present invention for remodeling the locking protrusion 8 for preventing separation into a large-diameter locking portion B having a large protruding amount outward in the radial direction is described in detail in the above-described structure for preventing the separation of the pipe joint portion. As described above, it can be mounted from the radially outer side in a state of projecting radially outward from the locking projection 8 with respect to the outer peripheral surface 2a of the inlet tube portion 2, and in the mounted state, The large-diameter locking body 10 capable of coming into contact with the lock ring 6 provided on the inner peripheral surface of the mouth tube portion 1 from the tube axis X direction, and the engagement formed in the large-diameter locking body 10 The large-diameter locking body 10 is attached to the locking protrusion 8 by detachably engaging and mounting the receiving portion 10A and the distal end portion of the insertion tube portion 2. And a said engaging fixing member 11 for fixing the pipe axis X direction on the outer circumferential surface 2a of the inserted pipe section 2 in contact state.

Next, a method for remodeling the engaging portion large diameter of the insertion tube portion 2 which is another embodiment of the present invention will be briefly described.
[1] As shown in FIG. 1, the distal end of the insertion tube portion 2 is placed on the outer peripheral surface 2 a of the insertion tube portion 2 covering the push ring 4, the elastic seal material 3, the backup ring 7, and the lock ring 6. Projecting outward in the radial direction from the locking protrusion 8 for preventing separation formed in the portion, the mounting groove 1b of the receiving tube portion
A ring-shaped metal large-diameter member that can come into contact with the lock ring 6 mounted on the tube from the tube axis X direction and can be elastically deformed in the diameter-expanding direction cut at one place in the circumferential direction. A tube shaft core while the stop body 10 is elastically deformed to a larger diameter than the locking projection 8 or while being elastically deformed to the enlarged diameter along the cam surface 8a on the distal end side of the locking projection 8. The large-diameter locking body 10 is inserted from the X direction and contracted by the elastic restoring force of the large-diameter locking body 10 when it passes through the annular rear surface 8b of the locking projection 8, whereby the large-diameter locking body 10 is inserted into the inlet tube portion. The outer peripheral surface 2a of 2 is mounted from the outside in the radial direction.

[2] As shown in FIG. 2, the inner diameter of the large-diameter locking body 10 is set to be equal to that of the inlet tube section 2 over the thin connecting end portions 10 e formed at both ends in the circumferential direction of the large-diameter locking body 10. The connecting piece 12 for maintaining the same mounting diameter as the outer diameter of the outer peripheral surface 2 a is fixedly connected by caulking of the rivet 13 inserted from the inner peripheral surface side of the connecting end portion 10.

[3] As shown in FIG. 3, the distal end surface 2b and the inner peripheral surface 2c at the distal end portion of the insertion tube portion 2 and the cam surface 8a and the outer peripheral surface 8c of the locking projection 8 from the tube axis X direction. The first engagement portion 11a that comes into contact (contacts) in close contact with the insertion of the second engagement portion, and the second engagement portion that engages with the engagement groove 10a of the large-diameter locking body 10 from the outside in the radial direction An annular bottomed cylindrical rubber or synthetic resin or metal engagement fixing member 11 provided with 11b and an engagement groove 10a of the engagement receiving portion 10A formed on the large-diameter locking body 10 By engaging and mounting with the elastic force of the engagement fixing member 11 itself over the distal end portion of the insertion tube portion 2, the large-diameter locking body 10 is tubed against the annular rear surface 8 b of the locking protrusion 8. It fixes to the outer peripheral surface 2a of the insertion tube part 2 in the state contact | abutted from the axial center X direction.

[4] As shown in FIG. 5, after the insertion tube portion 2 assembled with the large-diameter locking body 10 and the engagement fixing member 11 is inserted into the reception tube portion 1, the reception tube portion 1. As shown in FIG. 6, the lock ring 6 that has been diameter-reduced by the ring restrictor 15 is inserted into the mounting groove 1 b formed in the large-diameter inner peripheral surface 1 a of the large-diameter inner peripheral surface 1 a. It mounts | wears through the annular space S between 1a and the outer peripheral surface 2a of the insertion tube part 2, and inserts the backup ring 7 with the insertion rod outside a figure until it contacts the lock ring 6 through the said annular space S.

[5] As shown in FIGS. 1 and 5, the elastic sealing material 3 is pushed between the large-diameter inner peripheral surface 1a of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2, and the bolt 5c and a seal pressing portion 4a formed at one end portion of the push ring 4 in the tube axis X direction by relative movement in the tube axis X direction of the push ring 4 and the receiving tube portion 1 accompanying the tightening operation of the nut 5d. Then, the elastic seal member 3 is compressed and deformed, and the space between the outer peripheral surface 2a of the insertion tube portion 2 and the large-diameter inner peripheral surface 1a of the receiving tube portion 1 is sealed.

[Second Embodiment]
In the first embodiment described above, the entire engagement fixing member 11 including the first engagement portion 11a and the second engagement portion 11b is connected to the engagement protrusion 8 of the insertion tube portion 2 and the large-diameter engagement. Although it is configured in a cylindrical shape with an annular bottom that covers the engagement receiving portion 10A of the body 10 from the direction of the tube axis X, as shown in FIGS. 9 and 10, the distal end of the distal end portion of the insertion tube portion 2 The first engaging portion 11a that abuts (contacts) the surface 2b, the inner peripheral surface 2c, the cam surface 8a of the locking projection 8 and the outer peripheral surface 8c in close contact with the insertion from the tube axis X direction. A plurality of second engaging portions 11b that are configured in a cylindrical shape with an annular bottom and that are engaged with the engaging grooves 10a of the large-diameter locking body 10 from the outside in the radial direction are intermittently provided in the circumferential direction. In the embodiment, it may be composed of four engagement pieces.

In this second embodiment, it protrudes radially outward from the locking projection 8 and can abut against the lock ring 6 mounted in the mounting groove 1b of the receiving tube portion from the tube axis X direction. The ring-shaped metal large-diameter locking body 10 includes a divided large-diameter locking body 10B divided into a plurality of parts in the circumferential direction (in this embodiment, divided into two), and the divided large-diameter locking body 10 Out of the thin connecting end portions 10e formed at both ends in the circumferential direction of 10B, the inner diameter of the large-diameter locking body 10 is set to the outer peripheral surface 2a of the inlet tube portion 2 over both connecting end portions 10e adjacent in the circumferential direction. A connecting piece 12 for maintaining the same mounting diameter as the outer diameter is fixedly connected by caulking of the rivet 13 inserted from the inner peripheral surface side of the divided large-diameter locking body 10B.
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]
In the first embodiment described above, the entire engagement fixing member 11 including the first engagement portion 11a and the second engagement portion 11b is connected to the engagement protrusion 8 of the insertion tube portion 2 and the large-diameter engagement. Although it has a cylindrical shape with an annular bottom covering the engagement receiving portion 10A of the body 10 from the tube axis X direction, the circumferential width of the engagement fixing member 11 is set as shown in FIGS. The insertion tube portion 2 has a small width that is less than half of the outer peripheral length of the distal end portion, more specifically, a small width with a central angle of 30 degrees, and a plurality of engagement fixing members 11 (4 in this embodiment). The large-diameter locking body 10 is attached to the locking protrusion 8 by engaging and engaging the engagement receiving portion 10A of the large-diameter locking body 10 and the distal end portion of the insertion tube portion 2. Alternatively, it may be configured to be fixed to the outer peripheral surface 2a of the insertion tube portion 2 in a state of being in contact with the tube axis X direction.

Each of the engagement fixing members 11 is a ring-shaped metal large-diameter latch that can come into contact with the lock ring 6 mounted in the mounting groove 1b of the receiving pipe portion from the tube axis X direction. The rivet 16 is fixedly connected to the body 10 by caulking.
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.

[Fourth Embodiment]
In the first embodiment described above, the second engaging portion 11b of the engaging and fixing member 11 can be elastically deformed radially outward from the engaging receiving portion 10A of the large-diameter locking body 10, and The engagement receiving portion 11A is engaged with the engagement receiving portion 11A while being reduced in diameter from the expanded diameter operation state. However, as shown in FIGS. In addition, rotation in which a plurality of (four in the present embodiment) engaging projections in the circumferential direction constituting the second engaging portion 11b of the engaging and fixing member 11 slides and guides around the tube axis X in a relatively rotatable manner. A guide path 10f and a detachable recess 10g that allows the engagement protrusion 11b to be inserted and removed in the direction of the tube axis X when the engagement protrusion 11b is at a specific position in the rotation direction of the rotation guide path 10f; Engagement deviating in a circumferential direction from a specific position of the rotation guide path 10f. When there is the engaging projection 11b in position, engaging wall portion 10h which abutment prevents insertion and removal movement in pipe axis X direction of the engaging projections 11b are formed.

  A plurality of engagement protrusions constituting the second engagement portion 11b of the engagement fixing member 11 and a detachable recess 10g formed in the engagement receiving portion 10A of the large-diameter locking body 10 are tube axis. When the engagement fixing member 11 is moved closer to the large-diameter locking body 10 attached to the insertion tube portion 2 when the phase is in a specific phase opposite to each other in the X direction, The engagement protrusion 11b of the engagement fixing member 11 is engaged with the rotation guide path 10f through the attachment / detachment recess 10g of the engagement receiving portion 10A of the large-diameter locking body 10, and in this state, the engagement protrusion 11b is large. When the engagement member 11b is positioned at an engagement holding position that is biased in the circumferential direction from a specific position of the rotation guide path 10f by relatively rotating the diameter locking body 10 around the tube axis X, the engagement is performed. The engaging protrusion 11b of the fixing member 11 and the engaging wall portion 10h of the large-diameter locking body 10 The engagement fixed state relative movement in pipe axis X direction is prevented.

Therefore, the engagement protrusion 11b of the engagement fixing member 11 is pushed in the direction of the tube axis X with respect to the desorption recess 10g of the large-diameter locking body 10 attached to the insertion tube portion 2 and rotated by a predetermined angle. Since it can be engaged and fixed simply by operating, and when disassembling, it is only necessary to rotate the engagement protrusion 11b of the engagement fixing member 11 with respect to the large-diameter locking body 10 and pull it out by a predetermined angle. For example, the engagement receiving portion 10 of the large-diameter locking body 10 by the elastic restoring force of the second engagement portion 11 b of the engagement fixing member 11.
Compared with the case of engaging with A, the engagement connection work and the disassembly work of the large-diameter locking body 10 and the engagement fixing member 11 can be performed quickly and easily.

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.
In the present embodiment, the second engagement portion 11b of the engagement fixing member 11 is configured by a plurality of (four in the present embodiment) engagement protrusions in the circumferential direction, but one engagement in the circumferential direction. You may comprise from a processus | protrusion.

[Fifth Embodiment]
In the first embodiment described above, the lock ring 6 is directly attached to the mounting groove 1b formed in the inner peripheral surface 1a of the receiving pipe portion 1 in a reduced diameter operation state, but as shown in FIGS. The deep second mounting groove 1c formed on the inner peripheral surface 1a of the receiving tube portion 1 allows passage of the large-diameter locking body 10 and the engagement fixing member 11 assembled to the insertion tube portion 2. A lock ring 17 that can be elastically deformed to the inner diameter expansion side to the inner diameter, and the lock ring 17 is held concentrically with the tube axis X of the receiving tube portion 1 in a state that allows the diameter expansion deformation of the lock ring 17. The centering elastic ring 18 to be attached may be mounted.

  The engagement fixing member 11 has a centering elastic ring 18 in the second mounting groove 1c on the inner peripheral surface 1a of the receiving tube portion 1 when the insertion tube portion 2 is inserted and connected to the receiving tube portion 1. The lock ring 17 is brought into contact with the lock ring 17 that is mounted so as to be deformable to expand in diameter from the tube axis X direction, and the lock ring 17 is brought to an inner diameter through which the engagement fixing member 11 and the large-diameter locking body 10 can pass. A cam surface 11d for expanding and deforming the diameter is formed.

  And using the wide internal space of the receiving pipe part 1 before the said insertion pipe part 2 is inserted, in the 2nd attachment groove | channel 1c formed in the internal peripheral surface 1a of this receiving pipe part 1 The insertion tube portion 2 in which the large-diameter locking body 10 and the engagement fixing member 11 are assembled even under a condition in which the lock ring 17 that can be expanded and deformed via the centering elastic ring 18 is mounted in advance. Is inserted into the receiving tube portion 1, the cam surface 11 d formed on the engagement fixing member 11 comes into contact with the lock ring 17 along with the insertion, and the lock ring 17 is connected to the engagement fixing member 11 and the large size. Since the diameter locking body 10 can be expanded and deformed to an inner diameter through which the diameter locking body 10 can pass, the insertion connection work of the insertion tube portion 2 with respect to the reception tube portion 1 can be performed efficiently and easily.

Further, in the large-diameter locking body 10, it comes into contact with the lock ring 17 detachably mounted in the second mounting groove 1 c on the inner peripheral surface 1 a of the receiving tube portion 1 from the tube axis X direction. The part is formed in a vertical annular surface that is perpendicular to the tube axis X.
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) In the above-described embodiment, the separation preventing structure between the receiving pipe portion 1 formed in one fluid pipe P and the insertion pipe portion 2 formed in the other fluid pipe P has been described. The present invention may be applied to a structure for preventing separation between the receiving tube portion 1 and the insertion tube portion 2 provided in a fluid device such as a joint or a gate valve.

(2) In each of the above-described embodiments, the large-diameter locking body 10 is fixed to the outer peripheral surface 2a of the insertion tube portion 2 in a state where the large-diameter locking body 10 can be brought into contact with the locking protrusion 8 from the tube axis X direction. The engagement fixing member (engagement fixing means) 11 is detachably engaged across the engagement receiving portion 10A formed on the large-diameter locking body 10 and the distal end portion of the insertion tube portion 2, A fitting connection portion (a portion to be fitted from the tube axis direction) between the engagement fixing member 11 and the large-diameter locking body 10 in an engaged state with the distal end portion of the insertion tube portion 2.
Or you may fix-connect a joint connection part (part contact | abutted from a pipe-axis direction) by fastening means, such as a screw and a volt | bolt.
Further, as shown in the sixth embodiment of FIG. 17, male and female screws that are detachably screwed into the opposite portions of the engagement fixing member 11 and the large-diameter locking body 10 from the tube axis X direction. (In this embodiment, taper screws) 14a and 14b are formed, and the large-diameter locking body 10 is pulled by the pulling and fixing action by the screwing operation of the engaging and fixing member 11 and the large-diameter locking body 10. You may comprise so that it may fix to the outer peripheral surface 2a of the insertion tube part 2 in the state contact | abutted from the tube axis X direction with respect to the annular | circular back surface 8b of the latching protrusion 8. FIG.

  (3) As the engagement fixing means 11, the engagement receiving portion 10A formed on the large-diameter locking body 10 and the distal end portion of the insertion tube portion 2 are extended at least with respect to the distal end portion of the insertion tube portion 2. The large-diameter locking body 10 is fixed to the outer peripheral surface 2a of the insertion tube portion 2 in a state where the large-diameter locking body 10 can be brought into contact with the locking projection 8 from the tube axis X direction. Any structure can be used as long as it can be used.

The half cross-section side view of the pipe joint part detachment preventing structure showing the first embodiment of the present invention (A) and (B) are a cross-sectional side view and a perspective view before the large-diameter locking body is mounted on the insertion tube portion. (A) and (B) are a cross-sectional side view and a perspective view before the engagement fixing member is mounted on the insertion tube portion. (A) and (B) are a cross-sectional side view and a perspective view when the engagement fixing member is attached to the insertion tube portion. Cross-sectional side view before connection of receiving tube and insertion tube (A) and (B) are a front view of the lock ring and a plan view during diameter reduction operation. (B) and (b) are a front view and a longitudinal sectional view of the backup ring. Cross-sectional side view at the time of connection between the receiving tube and the insertion tube (A) and (B) are a perspective view and a determination surface view of an engagement fixing member showing a second embodiment of the present invention. A perspective view when the engagement fixing member is attached to the insertion tube portion The perspective view before attaching the engagement fixing member which shows 3rd Embodiment of this invention to an insertion tube part. A perspective view when the engagement fixing member is attached to the insertion tube portion (A), (B) is an exploded perspective view of a large-diameter locking body and an engagement fixing member showing a fourth embodiment of the present invention, and a perspective view at the time of engagement connection. (A), (B), (C) are explanatory diagrams of engagement and connection between the large-diameter locking body and the engagement fixing member. Half sectional side view of a pipe joint part detachment preventing structure showing a fifth embodiment of the present invention Partial enlarged sectional view of lock ring and centering elastic ring The expanded sectional view of the principal part of the separation prevention structure of the pipe joint part which shows 6th Embodiment of this invention. Half-section side view showing a conventional SII type pipe joint detachment prevention structure Half sectional side view showing a conventional NS type pipe joint separation prevention structure

Explanation of symbols

B Large-diameter locking part X Tube core 1 Receptor pipe part 1a Inner peripheral surface (large-diameter inner peripheral surface)
2 Insertion tube part 2a Outer peripheral surface 3 Sealing material (elastic sealing material)
6 Lock Ring 8 Locking Protrusion 10 Large Diameter Locking Body 10A Engagement Receiving Portion 10B Divided Large Diameter Locking Body 10b Inclined Surface 10f Rotating Guide Path 10g Demounting Recess 10h Engaging Wall 11 Engagement Fixing Means Element)
11a 1st engaging part 11b 2nd engaging part (engagement protrusion)
11d Cam surface 17 Lock ring 18 Centering elastic ring

Claims (13)

Detachment prevention structure of the pipe joint portion in which a locking projection for preventing separation is formed at the distal end portion of the outer peripheral surface of the insertion tube portion inserted and connected to the receiving tube portion,
Projects radially outward from the locking projection on the outer peripheral surface of the insertion tube portion, and can contact the lock ring provided on the inner peripheral surface of the receiving tube portion from the tube axis direction. A large-diameter locking body is mounted from the outside in the radial direction, and the large-diameter locking body is mounted in a state of being engaged with at least the distal end portion of the insertion tube section across the large diameter locking body and the distal end portion of the insertion tube section. By means of the above, the pipe joint portion provided with the engagement fixing means for fixing the large-diameter locking body to the outer peripheral surface of the insertion tube portion in a state in which the large-diameter locking body can be brought into contact with the locking projection from the tube axis direction. Detachment prevention structure.   When the engagement fixing means is mounted over the large-diameter locking body and the distal end portion of the insertion tube portion, the large-diameter locking body is in contact with the locking projection from the tube axis direction. 2. The structure for preventing separation of a pipe joint portion according to claim 1, wherein the structure is fixed to an outer peripheral surface of the insertion tube portion.   The engagement fixing means includes a first engagement portion that comes into contact with at least a distal end surface of the distal end portion of the insertion tube portion from the tube axis direction, and an engagement receiving portion formed on the large-diameter locking body. 3. A structure for preventing the detachment of a pipe joint portion according to claim 1 or 2, comprising an engaging and fixing member provided with a second engaging portion that engages with the pipe engaging portion.   At least the first engagement portion of the engagement fixing member is tubed at least with respect to the distal end surface in the distal end portion of the insertion tube portion in a state where the engagement protrusion of the insertion tube portion is covered with the locking projection of the insertion tube portion from the tube axis direction. The pipe joint part detachment preventing structure according to claim 3, wherein the pipe joint part is configured in a cylindrical shape with an annular bottom that can be contacted from the axial direction.   The circumferential width of the engagement fixing member is configured to be a small width that is not more than half of the outer peripheral length of the distal end portion of the insertion tube portion, and a plurality of the engagement fixing members are engaged with the large-diameter locking body. An outer periphery of the insertion tube portion in a state in which the large-diameter locking body can be brought into contact with the locking projection from the tube axis direction by engaging and mounting over the receiving portion and the distal end portion of the insertion tube portion. 4. The structure for preventing the separation of a pipe joint portion according to claim 3, wherein the structure is fixed to a surface.   The second engagement portion of the engagement fixing member can be elastically deformed radially outward from the engagement receiving portion of the large-diameter locking body, and the diameter of the second engagement portion can be reduced while reducing the diameter from the expanded operation state. The structure for preventing detachment of a pipe joint portion according to any one of claims 3 to 5, wherein the structure is configured to engage with an engagement receiving portion.   The engagement receiving portion of the large-diameter locking body guides one or a plurality of engagement projections in the circumferential direction constituting the second engagement portion of the engagement fixing member so as to be relatively rotatable around the tube axis. A rotation guide path, a detachable recess that allows the engagement protrusion to be inserted and removed in the tube axis direction when the engagement protrusion is at a specific position in the rotation direction of the rotation guide path, and the rotation guide path When the engagement protrusion is located at an engagement holding position deviated from the specific position in the circumferential direction, an engagement wall portion that prevents the engagement protrusion from being inserted and removed in the tube axis direction is formed. 5. A structure for preventing separation of a pipe joint portion according to claim 3 or 4.   The engagement fixing member is attached to the mounting groove on the inner peripheral surface of the receiving tube portion so that the diameter of the engaging fixing member can be increased through a centering elastic ring when the insertion tube portion is inserted and connected to the receiving tube portion. 2. A cam surface is formed which abuts against the formed lock ring from the tube axis direction and expands and deforms the lock ring to an inner diameter through which the engagement fixing member and the large-diameter engaging body can pass. The pipe joint part detachment prevention structure according to any one of? 7.   The portion of the large-diameter locking body that comes into contact with the lock ring detachably attached to the mounting groove on the inner peripheral surface of the receiving tube portion from the tube axis direction is the tip of the insertion tube portion. 9. The structure for preventing detachment of a pipe joint portion according to any one of claims 1 to 8, wherein the structure is formed on an inclined surface having a larger diameter toward a partial side.   The pipe joint portion according to any one of claims 1 to 9, wherein the large-diameter locking body is configured in a ring shape that is elastically deformable in a diameter-enlarging direction that is cut at one place in a circumferential direction. Detachment prevention structure.   The structure for preventing separation of a pipe joint portion according to any one of claims 1 to 9, wherein the large-diameter locking body is composed of a divided large-diameter locking body divided into a plurality of parts in the circumferential direction. Remodeling the locking protrusion for preventing separation formed at the distal end of the outer peripheral surface of the insertion tube portion inserted and connected to the receiving tube portion into a large-diameter engagement portion with a large radial outward protrusion A method,
Projects radially outward from the locking projection on the outer peripheral surface of the insertion tube portion, and can contact the lock ring provided on the inner peripheral surface of the receiving tube portion from the tube axis direction. A large-diameter locking body is mounted from outside in the radial direction, and the large-diameter locking body and the distal end portion of the insertion tube portion are engaged with at least the distal end portion of the insertion tube portion. By attaching a fixing member, the large-diameter locking body is fixed to the outer peripheral surface of the insertion tube portion in a state in which the large-diameter locking body can be brought into contact with the locking protrusion from the tube axis direction. How to remodel the locking part of the pipe. This is a remodeling tool that remodels the locking protrusion for preventing separation at the tip of the outer peripheral surface of the insertion tube portion that is inserted and connected to the receiving tube portion into a large-diameter engagement portion that protrudes radially outward. And
It can be mounted from the radially outer side in a state of projecting radially outward from the locking projection with respect to the outer peripheral surface of the insertion tube portion, and in the mounted state on the inner peripheral surface of the receiving tube portion A large-diameter locking body capable of coming into contact with the provided lock ring from the tube axis direction, and at least the distal end portion of the insertion tube section across the large-diameter locking body and the distal end portion of the insertion tube section The engagement fixing member that fixes the large-diameter locking body to the outer peripheral surface of the insertion tube portion in a state in which the large-diameter locking body can be brought into contact with the locking protrusion from the tube axis direction. A locking part large diameter remodeling tool for the insertion tube part.

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