JP4266843B2 - Fixing ring mounting jig - Google Patents

Description

  The present invention relates to a fixing ring mounting jig used when a ring for fixing a pipe end anticorrosion core or the like attached to a metal pipe insertion opening constituting a pipeline of a water supply or the like is attached.

  Conventionally, for example, when a ductile cast iron pipe is buried in the ground and a pipe line is laid, the entire pipe is protected against corrosion by painting or lining, and as shown in FIG. In general, the insertion port 2a of the succeeding tube 2 is inserted and joined. At this time, as shown in the figure, in the NS type joint provided with earthquake resistance, the lock ring 3 is provided on the inner surface of the receiving port 1a, and the projection 4 gets over the lock ring 3 as shown by the chain line in the figure. Insert the insertion slot 2a. In the figure, 5 is a packing and 6 is a lining.

  In the laying of this pipe line, there is a case where the pipe 2 is not always connected only by a fixed-size pipe, but the pipe 2 must be cut and joined so as to have a predetermined length at the construction site. When the tube 2 is cut in this way, the coating is peeled off and the background is exposed on the tube end surface that becomes the cut surface, so that the anticorrosion function is impaired and red water or the like is generated. Therefore, in general, the anticorrosion paint is applied again to the end face after the cut tube to perform the anticorrosion. However, when anti-corrosion paint is applied to the end face after the cut tube and the anti-corrosion is applied again, it takes time to dry in cold weather, and it is difficult to apply in places where running water does not stop completely, such as switching work. There is a problem that it is difficult to work.

For this reason, as a method other than applying the anticorrosion paint to the end face after the cut tube, there is a method of sealing the exposed portion using the anticorrosion core 7 as shown in FIGS. Since the anticorrosion core 7 is made of an elastic body such as rubber, the anticorrosion core 7 is retained by its elasticity. However, as a method for more reliably fixing, the anticorrosion core is used by using a fixing ring 10 that is 10% open in the circumferential direction. There is one in which 7 is fixed from the inner surface by an expanding force (see Patent Document 1).
Japanese Patent Laid-Open No. 7-139686

Further, as shown in FIGS. 16 and 17, the fixing ring 10 is divided into one in the circumferential direction, both ends 11 and 13 thereof are overlapped, and the locking piece 15 of the other end 13 is inserted through the one end 11. In some cases, the locking piece 15 is folded back, and the function of preventing the diameter reduction of the fixing ring 10 is provided by the folding back (see Patent Document 2).
JP 2002-286195 A

  The fixing ring 10 is first formed into a circular shape as shown in FIG. 17 (a), and then, as shown in FIG. A piece 15 is inserted so that the outer diameter of the ring 10 is smaller than the inner diameter of the core 7, and the fixing ring 10 is accommodated in the annular groove 9 on the inner surface of the core 7 as shown by the chain line in FIG. 10 is expanded (see FIG. 17B), and the locking piece 15 that is viewed from the hole 12 is bent as shown in FIGS. 16 and 17C, and is fixed so that the ring 10 does not contract in the circumferential direction.

  Generally, a jig such as a snap ring pliers P or a vise is used to reduce or increase the diameter of the fixing rings 10. These fixing ring mounting jigs (pliers P) may cause the pair of grips 21 and 22 to be strongly clamped and cause the fixing ring 10 to expand or contract more than necessary to be damaged.

Therefore, the applicant of the present application, as shown in FIG. 17 (b) chain line and FIG. 18, rotatably connects one end of the pair of grip handles 21, 22 and grip pieces 24, 25 from one end of both grip handles. And extending a load adjusting rod 30 between the other ends of the grip handles 21 and 22, locking one end of the load adjusting rod 30 to the other end of one grip handle 21, and A load adjusting mechanism 50 comprising a spring 51 or the like is provided at the other end of the grip handle 22, and the front end engaging elements 26 of the grip pieces 24, 25 are divided into two at both ends of the fixing ring 10, respectively. A jig P for attaching the fixing ring 10 in a tension state in which the diameter of the grip ring 24 or 25 is widened or narrowed by gripping the other end of the grips 21 and 22 to reduce or widen the diameter is proposed. (See Patent Document 3).
JP 2002-28875 A

In the fixing ring mounting jig P described in Patent Document 3, after the diameter of the fixing ring 10 is increased (after tightening), it is necessary to tighten the tightening nut 52 in order to maintain the gap between the grip pieces 24 and 25. is there.
For this reason, during the tightening, the jig P is held with one hand and the tightening nut 52 is tightened with the other hand. If the jig P moves during the tightening, both ends of the fixing ring 10 are fixed. There is a possibility that the engaging element 26 inserted into the enlarged diameter hole 16 may come off. In particular, in the fixing ring 10 to the pipe having a small nominal diameter, the jig P is detached even if the jig P is slightly moved.

  This invention makes it a subject to make it possible to perform the expansion-contraction diameter and fixation of the fixing ring 10 reliably and rapidly in view of the above point.

In order to achieve the above object, according to the present invention, the expansion / contraction diameter / fixing action of the fixing ring 10 is performed by the toggle clamp mechanism.
The toggle clamp mechanism connects the fixed side and the movable side with a link, and moves the movable side to and from the fixed side for a fixed length by operating the handle. Can be fixed.
For this reason, if the narrowing between the grip pieces 24 and 25 by the grip patterns 21 and 22 of the jig P is performed by the toggle clamp mechanism, the operation becomes smooth. Further, since the contact / separation is always a fixed length, if the length is made to correspond to the expansion / contraction width of the fixed ring in advance, the expansion / contraction width is always obtained, and torque management using the expansion / contraction width is easy. At this time, depending on the type of the toggle clamp mechanism, the expansion width may be defined by torque (load).

  In the present invention, since the grip pieces 24 and 25 are expanded and narrowed by the grip handles 21 and 22 of the jig P by the toggle clamp mechanism, the operation is smooth and the fixed side of the toggle clamp mechanism is movable. Since the contact / separation length on the side is constant, if the length is set in advance to the required expansion / contraction diameter length of the fixing ring, the fixing ring will be expanded / contracted more than necessary, causing deformation distortion, etc. There is no fear of damage.

  As an embodiment of the present invention, one end of the above-mentioned pair of grip handles 21, 22 is rotatably connected, and grip pieces 24, 25 are respectively extended from one end of both grip handles, 25, the front end engaging elements 26 are divided into two at the both ends of the fixing ring 10, and the other gripping handles 21 and 22 are gripped to widen or narrow the gaps between the grip pieces 24 and 25. Then, in a conventionally known jig P for attaching the fixing ring 10 in a tensioned state with a reduced diameter or an enlarged diameter, a load adjusting rod is spanned between the other ends of the both grip handles 21 and 22, and one grip handle 21 The other end of the load adjusting rod is locked to one end, and a toggle clamp mechanism is provided between the other end of the other grip handle 22 and the other end of the load adjusting rod. The other handle 2, the movable side is fixed to the other end of the load adjusting rod, and the grip clamps 21, 22 are brought into contact with and separated from the fixed side by the toggle clamp mechanism. It is possible to adopt a configuration in which the distance between the other ends is expanded or reduced by a certain length.

In this configuration, if the fixed side of the toggle clamp mechanism is swingable to the other end of the other handle 22, the load adjusting rod can be swung with respect to the other handle 22. One end can be easily locked to the other end of one grip 21.
Further, if the other end of the load adjusting rod is inserted into the fixed side of the toggle clamp mechanism so as to be movable in the axial direction, the load adjusting rod moves linearly in a fixed direction with respect to the fixed side. The load adjusting rod moves only in a straight line in a certain direction with respect to the toggle clamp mechanism (fixed side), and the movement is stable, and both grip pieces 24 and 25 by the two grip handles 21 and 22 of the jig P are fixed. Expansion and narrowing can be performed smoothly and stably.

  Furthermore, a latching element is provided at one end of the load adjustment rod, which is movable in the axial direction and can be fixed at an arbitrary position. If the fixed side of the toggle clamp mechanism is swingably attached to the other end of the other grip handle, the locking element is fixed at an arbitrary position of the load adjusting rod. By doing so, the initial distance between the other ends of both grips before the operation of the toggle clamp mechanism can be made arbitrary. For this reason, it becomes a jig | tool which can respond to the diameter change (pipe with a different nominal diameter) of a fixing ring.

In this jig P, when the tip engaging elements 26 of the grip pieces 24 and 25 are locked to the fixing ring 10, it is necessary to maintain the locked state and to operate the toggle clamp mechanism. At that time, the jig P may not be stabilized and may be unlocked.
For this reason, in a configuration in which a latch is provided at one end of the load adjustment rod, the latch is only movable in the axial direction of the load adjustment rod, and the load adjustment rod outside the latch is arranged. If a clamping nut is screwed into one end so as to be movable in the axial direction, and a spring urging in the direction of separating both of the clamping nut and the latch is interposed, the spring will be In order to bias the other end closer, both grip pieces 24 and 25 of the jig P are biased in the direction of expanding or reducing the diameter of the fixing ring 10. Locking is stable.

  This stabilization mechanism can be configured on the toggle clamp mechanism side. For example, the other end of the load adjustment rod is inserted into the movable side of the toggle clamp mechanism so as to be movable in the axial direction, and a spring receiver is provided at the end. A fixed spring is provided between the spring receiver and the movable side of the toggle clamp mechanism so as to urge them away, and the movable side of the toggle clamp mechanism can be fixed at any position of the load adjusting rod. Can be adopted.

  As shown in FIGS. 1 to 5, one example of gripping handles 21 and 22 having a U-shaped cross section is rotatably connected via a support shaft 23 in the same manner as a conventional fixing ring mounting jig P. Grip pieces 24 and 25 are respectively extended from one end of both grip patterns 21 and 22. Since the grip pieces 24 and 25 are not crossed, when the grip patterns 21 and 22 are closed, the grip pieces 24 and 25 are opened. Bolts 26, 26 are screwed into the grip pieces 24, 25, and the bolts 26 constitute engaging members. The grip pieces 24, 25 can be bolted to several types of auxiliary pieces 24 a, 25 a and the length thereof can be adjusted. The load (expansion / contraction force) applied to the engagement element 26 (fixing ring 10) can be adjusted by adjusting the length of the auxiliary pieces 24a and 25a.

  A load adjusting rod 30 is provided between the other ends of the grips 21 and 22 (hanged over). This load adjusting rod 30 is provided with a locking projection 31 by welding of a round bar or the like at one end and a toggle clamp mechanism 40 at the other end. One end of the load adjusting rod 30 can be fitted into a notch hole 27 at the other end of one grip handle 21 (see FIG. 4), and one end of the load adjusting rod 30 is fitted into the hole 27 to engage the locking projection 31. Is brought into contact with (locked to) the outer surface 28 of the other end of the handle 21 so that the load adjusting rod 30 is prevented from moving in the axial direction with respect to the handle 21.

A cross clamp (locking element) 32 is fitted inside the locking protrusion 31 at one end of the load adjusting rod 30 so as to be movable in the axial direction, and a clamp screw 33 is screwed into the cross clamp 32. The cross clamp 32 can be fixed to the load adjusting rod 30 by screwing the clamp screw 33 and press-contacting the tip of the clamp screw 33 to the load adjusting rod 30. For this reason, by loosening the clamp screw 33 and positioning the cross clamp 32 at an arbitrary position in the axial direction of the load adjusting rod 30 and screwing the clamp screw 33, the cross clamp 32 is moved at an arbitrary position in the axial direction of the load adjusting rod 30. Can be fixed.
The cross clamp 32 also has one end of the load adjusting rod 30 fitted into the notch hole 27 at the other end of the one handle 21 and comes into contact with the other outer surface 28 of the handle 21, The axial movement of the load adjusting rod 30 is prevented.

  The toggle clamp mechanism 40 includes a fixed side 41 and a movable side 42. The fixed side 41 includes a chassis 41a rotatably fixed to the other end of the other handle 22 via a bolt 43, a toggle clamp 41b fixed to the chassis 41a by a bolt 44, and a toggle clamp 41b. It comprises a guide boss 41c of the provided load adjusting rod 30. The movable side 42 includes a link 42a connected to the other end of the load adjusting rod 30 passing through the guide boss 41c, and a link with a handle connected between the link 42a and the toggle clamp 41b (hereinafter referred to as a toggle clamp handle). 42b).

  The chassis 41a, the toggle clamp 41b, the other end of the load adjusting rod 30, the link 42a, and the toggle clamp handle 42b constituting the toggle clamp mechanism 40 form an offset crank mechanism, and the toggle clamp handle 42b is the same as the solid line in FIG. By rotating in the direction of the chain line (in the direction of the arrow), the other end of the load adjusting rod 30 advances a certain length L with respect to the chassis 41a (guide boss 41c) (in the direction of the arrow), and the toggle clamp handle 42b exceeds the dead point. In the state of the chain line, the other end of the load adjusting rod 30 is not retracted unless the toggle clamp handle 42b is rotated in the reverse direction. At this time, the rotation of the toggle clamp handle 42b is easy because of the toggle clamp mechanism 40.

  This embodiment is configured as described above, and the case where the fixing ring 10 shown in FIGS. 15 to 17 is attached by the jig P will be described. First, the fixing ring 10 is in the state shown in FIG. After fitting into the groove 9 of the anticorrosion core 7, and then fitting the engagement element 26 of the jig P into the jig hole 16 as shown by the solid line from the chain line in FIG. 5A (see FIG. 17B). ), The load adjusting rod 30 is stretched between the grips 21 and 22 as shown by the solid line in FIG. 5A, and the cross clamp 32 is moved so as to contact the other outer surface 28 of one grip 21. At the same time, the clamp screw 33 is screwed to fix the cross clamp 32 to the load adjusting rod 30.

  From this state, as shown in FIG. 5 (b), when the toggle clamp handle 42b is raised and rotated to the opposite side (FIG. 5 (a) to FIG. 5 (b)), the other handle 21 is moved by the cross clamp 32. Since the end is fixed and the other end of the other grip handle 22 is fixed to the chassis 41a of the toggle clamp mechanism 40, the space between the grip handles 21, 22 is narrowed, and the grip pieces 24, 25 are opened and fixed accordingly. The diameter of the ring 10 is expanded (a predetermined diameter expansion force acts on the fixed ring 10). At this time, the other end of the load adjusting rod 30 is not retracted unless the toggle clamp handle 42b is rotated in the reverse direction. Further, the rotation of the toggle clamp handle 42b is easy because of the toggle clamp mechanism 40, and its torque (the diameter expansion force of the fixing ring 10) is constant.

  Thereafter, the locking piece 15 is bent as shown in FIGS. 17C and 16 to fix the fixing ring 10 so as not to shrink in the circumferential direction. When the mounting of the fixing ring 10 is completed, the toggle clamp handle 42b is rotated in the reverse direction, and one end of the load adjusting rod 30 is moved outward from the other end of the one handle 21 to remove the cross clamp 32, and the jig P Is removed from the ring 10. Alternatively, the clamp screw 33 is loosened to release the expanded load, and the jig P is removed.

  In this embodiment, in the case where the size of the fixing ring 10 for expanding the diameter is the same and the degree of diameter expansion (the opening of the grip pieces 24, 25) is constant (in the case of a pipe having the same nominal diameter), When the engagement element 26 of the jig P is fitted in the jig hole 16, the distance between the grip pieces 24 and 25 (between the other ends of the grip handles 21 and 22) is constant, and the cross clamp 32 and the clamp screw 33 If it is not necessary to adjust the length between the other ends of the grips 21 and 22, the cross clamp 32 and the clamp screw 33 are omitted, and the locking protrusion 31 is used as one of the load adjusting rods 30 corresponding to the length. The handle 21 can be locked to the other end.

  As shown in FIGS. 7 and 8, the fulcrum of the toggle clamp handle 42b of the toggle clamp mechanism 40 can be moved in the axial direction to the other end of the load adjusting rod 30 via the holder 42c, and the fixing screw 42d It can be fixed at an arbitrary position.

  In this embodiment, the engagement elements 26 of both grip pieces 24 and 25 are fitted into the jig hole 16 with the gap between the locking projection 31 and the toggle clamp mechanism 40 shown in FIG. (See FIG. 17 (b)). Thereafter, as shown in FIG. 17 (b), the toggle clamp mechanism 40 is engaged until the locking projection 31 abuts (locks) to the outer surface of the other end of the one grip handle 21. On the other hand, the other end of the load adjusting rod 30 is slid, and in this state, the holder 42c is fixed to the load adjusting rod 30 by the fixing screw 42d, and the toggle clamp mechanism 40 is fixed to the load adjusting rod 30.

From this state, as shown in FIG. 8 (c), the toggle clamp handle 42 b is raised and rotated to the opposite side to narrow the grips 21, 22, and the grip pieces 24, 25 open accordingly, and the fixing ring 10 Is expanded.
Thereafter, the locking piece 15 is bent as shown in FIGS. 17C and 16 to fix the ring 10 so as not to shrink in the circumferential direction. When the attachment of the fixing ring 10 is completed, the fixing screw 42d is loosened, and as shown in FIG. 8 (d), the gap between the locking projection 31 and the toggle clamp mechanism 40 is sufficiently opened, and the jig P is ringed. Remove from 10.

  In this embodiment, the toggle clamp handle 42b is rotated to the left in FIG. 8 (tilted) to expand (tighten) the fixing ring 10, but as shown in FIG. 9, it is rotated to the right. The fixing ring 10 may be expanded. At this time, the locking projection 31 is locked inside the other end of the handle 21, and each mode of FIGS. 9 (a) to 9 (d) corresponds to each mode of FIGS. 8 (a) to 8 (d). To do.

In the embodiment shown in FIGS. 7 and 8, as shown in FIG. 10, the coil in a compressed state is interposed between the locking projection (spring receiver) 35 at the other end of the load adjusting rod 30 and the holder 42 c of the toggle clamp mechanism 40. The spring 36 may be interposed. The operation is shown in FIGS. 10A to 10C, and each mode corresponds to each mode in FIGS. 8A to 8C.
At this time, as shown in FIG. 2B, the gripping protrusion 31 is locked to one grip 21 and the urging force of the spring 36 works in the approaching direction of the grips 21 and 22. When the engagement elements 26 of the pieces 24 and 25 are fitted into the jig hole 16, the engagement between the engagement element 26 and the jig hole 16 is maintained by the biasing force. For this reason, when the state is stabilized, the holder 42c is fixed to the load adjusting rod 30 by the fixing screw 42d, the toggle clamp handle 42b is raised, and the diameter of the fixing ring 10 is expanded.

  The spring 36 can also be interposed between the locking projection 31 and the cross clamp 32 in FIG. Further, by providing the cross clamp 32 with the load adjusting mechanism shown in FIG. 18, the engagement between the engagement element 26 and the jig hole 16 can be maintained. For example, as shown in FIG. 13, a spring receiver 37 is integrally provided on the cross clamp 32 so as to be movable in the axial direction of the load adjusting rod 30, and the axial direction is provided at one end of the load adjusting rod 30 outside the spring receiver 37. It is possible to employ a configuration in which a tightening nut 38 is screwed so as to be movable, and a spring 36 is interposed between the tightening nut 38 and the spring receiver 37 so as to urge both the members 37 and 38 apart. At this time, the spring receiver 37 can be omitted and the cross clamp 32 can also be used as a spring receiver.

In each of the above embodiments, the grip pieces 24 and 25 are not crossed (uncross). However, as shown in FIG. 11, if the grip patterns 21 and 22 are crossed, The grip pieces 24, 25 are narrowed by gripping the grip patterns 21, 22, and the diameter reducing action of the fixing ring 10 can be performed. At this time, if the toggle clamp mechanism 40 of FIGS. 1, 7, 8, and 10 is used, the diameter reduction action is performed by the illustrated rotation (tilt) of the toggle clamp handle 42b.
On the other hand, as shown in FIG. 11, the cross clamp 32 is locked to the inner recess at the other end of the handle 21 with the toggle clamp mechanism 42 b shown in FIG. In this case (FIG. 11 chain line state), the diameter of the fixing ring 10 can be increased by the rotation (standing) of the toggle clamp handle 42b.
Thus, the fixing ring can be obtained by appropriately adopting the initial mode of the toggle clamp mechanism 40, the locking mode of the cross clamp 32 to the other end of the grip 21 and the cross or uncross mode of the grips 21 and 22. Ten expansion / contraction diameters can be appropriately performed.

  As shown in FIG. 6A, the structure of the engagement element 26 may be such that the bolts 26 are inserted into the grip pieces 24 and 25 and are prevented from coming off by the nuts 26a. Further, as shown in FIG. 5B, if the outer edges of the grip pieces 24 and 25 and the auxiliary pieces 24a and 25a are chamfered, the chamfering is performed when the inner diameter (the inner diameter of the pipe) of the anticorrosion core 7 is small. Due to the lack, it becomes difficult to interfere with the fixing ring 10. These structures can be adopted in the above embodiments.

  As another embodiment of the toggle clamp mechanism 40, as shown in FIG. 12, the chassis 41a on the fixed side 41 is removed, and the other end of the other handle 22 is attached to the toggle clamp 41b so as to be rotatable (swingable). It can also be. At this time, the level difference between the grip handle 22 and the toggle clamp 41b is dealt with by appropriately interposing various washers 41d.

  Needless to say, the fixing ring mounting jig P of the present invention can be applied not only to the fixing ring 10 of the anticorrosion core 7 but also to all the fixing rings that are expanded and contracted in diameter.

Front view of one embodiment Side view of the main part of the same example Sectional view of the grip piece of the same embodiment The other end principal part of one grip handle of the same Example is shown, (a) is a left view, (b) is a front view. Operational diagram of this embodiment Another embodiment is shown, (a) is a sectional view of the grip piece, (b) is a front view of the grip piece. Front view of another embodiment Operational diagram of this embodiment Operational diagram of another embodiment Operational diagram of another embodiment Front view of another embodiment Side view of main part of another embodiment Side view of main part of another embodiment Cross section of the main part of the pipe joint Expanded cross-sectional view of the main part of the pipe insertion opening Illustration of mounting action of fixing ring Illustration of mounting action of fixing ring Front view of conventional example

Explanation of symbols

1, 2 Tube 1a Receptor 2a Insert 7 Corrosion-proof core 10 Corrosion-proof core fixing ring 21, 22 Grip handle 24, 25 Grip piece 26 Bolt (engagement element)
30 Load adjustment rod 31 Locking protrusion 32 Cross clamp (locking element)
33 Clamp screw 35 Locking projection (spring receiver)
36 Coil spring 37 Spring receiver 38 Clamping nut 40 Toggle clamp mechanism 41 Toggle clamp mechanism fixed side 42 Toggle clamp mechanism movable side 42b Toggle clamp handle P Fixing ring mounting jig

Claims (6)

While connecting one end of a pair of grip handles 21 and 22 rotatably, the grip pieces 24 and 25 are each extended from the end of both the handle patterns 21 and 22, and the front-end | tip engaging element 26 of both the grip pieces 24 and 25 is provided. Is fixed to both ends of the fixing ring 10 and the other gripping handles 21 and 22 are gripped to widen or narrow the space between the grip pieces 24 and 25, thereby fixing the fixing ring 10. In the jig P that attaches in a tension state in which the diameter is reduced or expanded,
A load adjusting rod 30 is stretched between the other ends of the grip handles 21 and 22, and one end of the load adjusting rod 30 is locked to the other end of the one grip handle 21, and the other end of the other grip handle 22. And the other end of the load adjusting rod 30 is provided with a toggle clamp mechanism 40. The toggle clamp mechanism 40 has a fixed side 41 fixed to the other end of the other grip handle 22 and a movable side 42 of the movable clamp 42. The distance between the other ends of the grips 21 and 22 is fixed to a fixed length by the toggle clamp mechanism 40 being fixed to the other end of the load adjusting rod 30 and contacting and separating the fixed length L on the movable side with respect to the fixed side. Fixing ring mounting jig characterized by widening and narrowing.   The fixing ring mounting jig according to claim 1, wherein the fixing side 41 of the toggle clamp mechanism 40 is swingable to the other end of the other grip handle 22.   The other end of the load adjusting rod 30 is inserted into the fixed side 41 so as to be movable in the axial direction thereof, and the load adjusting rod 30 moves linearly in a fixed direction with respect to the fixed side 41. The fixing ring mounting jig according to claim 1 or 2, characterized in that   One end of the load adjustment rod 30 is provided with a latch 32 that is movable in the axial direction and can be fixed at an arbitrary position, and this latch 32 is held by the one grip at the fixed position on the load adjustment rod 30. The lock 21 can be locked to the other end of the handle 21, and the fixed side 41 of the toggle clamp mechanism 40 is swingably attached to the other end of the other grip handle 22. The fixing ring mounting jig according to 3.   The locking element 32 is only movable in the axial direction of the load adjusting rod 30, and a tightening nut 38 is screwed into one end of the load adjusting rod 30 outside the locking element 32 so as to be movable in the axial direction. 5. A fixing ring mounting jig according to claim 4, wherein a spring 36 is interposed between the tightening nut 38 and the locking element 32 so as to urge both the members 38 and 32 away from each other. .   The other end of the load adjusting rod 30 is inserted into the movable side 42 of the toggle clamp mechanism 40 so as to be movable in the axial direction, and a spring receiver 35 is fixed to the end thereof. A spring 36 is provided between the movable side 42 and the spring 36 for urging both sides 35 and 42 away from the movable side 42, and the movable side 42 of the toggle clamp mechanism 40 can be fixed at an arbitrary position of the load adjusting rod 30. The fixing ring mounting jig according to claim 3, wherein the fixing ring mounting jig is a fixed ring mounting jig.

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