JP7240950B2 - Stop ring mounting jig and stop ring mounting method using the mounting jig - Google Patents

Description

The present invention provides a mounting jig used when mounting a stop ring for a hole to a mounting groove provided on the inner wall of a hole provided in an object, and a stop ring mounting method using the mounting jig. Regarding.

Conventionally, a stop ring for a hole is attached to a mounting groove provided on the inner wall of a hole provided in an object.

For example, stop rings for holes are also used in steel pipe piles that are widely used as foundation structures for objects such as bridges, port structures, and building structures.

More specifically, such steel pipe piles must be erected with a length of several tens of meters so as to reach the support layer, which is the hard ground below the soft ground. However, it is not realistic to transport steel pipe piles of such length, so steel pipes of several meters each are manufactured at a factory, and multiple pipes are delivered to the site and connected sequentially while being piled up. is widely practiced.

At that time, a mechanical steel pipe connection mechanism is used to improve the efficiency of the vertical pile work of steel pipe piles at the construction site from the viewpoint of labor saving of connection work and shortening of construction period.

As shown in Patent Literature 1, a mechanical steel pipe coupling mechanism has a female cylindrical joint welded to the lower portion of an upper steel pipe and a male axial joint welded to the upper portion of a lower steel pipe. The load transmission key accommodated in the inward circumferential groove of the cylindrical joint is pushed out into the outward circumferential groove provided in the shaft joint and screwed into the through hole communicating with the inward circumferential groove. By fixing the load transmission key at a position straddling the inward and outward circumferential grooves with a fixing bolt, the shaft joint and the cylindrical joint are connected in a retaining state. ing.

If the load transmission key falls out of the through-hole due to loosening of the insertion fixing bolt due to impact or vibration during construction of the steel pipe pile, for example, there is a risk that the shaft joint and the cylindrical joint will be disconnected from each other. be.

Therefore, a stop ring for a hole is configured to be attachable to a mounting groove provided in a through hole as a hole provided in a steel pipe pile as an object.

The stop ring is a member made of metal such as stainless steel in the shape of a circle with an outer diameter larger than the inner diameter of the through-hole, with a part notched. An engaging hole is provided for mating.

The stop ring is attached to the attachment groove by engaging an attachment tool in the engagement hole to reduce the diameter of the stop ring below the inner diameter of the through hole, and then inserting the stop ring into the attachment groove.

When the diameter reduction by the mounting tool is stopped, the stop ring attempts to expand to the original outer diameter due to its elasticity and is fixed inside the mounting groove. This prevents the insertion fixing bolt from dropping out of the through hole.

JP 2018-48543 A

However, the operation of attaching stop rings to the attachment grooves of all the through holes is very complicated and takes time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a mounting jig capable of easily and quickly mounting a stop ring to a mounting groove provided in the inner wall of a hole provided in an object. An object of the present invention is to provide a stop ring mounting method using a mounting jig.

In order to achieve the above object, the mounting jig of the present invention is characterized by a mounting jig used when mounting a stop ring for a hole to a mounting groove provided on the inner wall of a hole provided in an object. A tubular member having an insertion hole through which the stop ring to be attached to the mounting groove can be inserted; and a shaft-shaped member that can be pushed out from an insertion hole into the hole. It has a front opening located on the front side in the insertion direction, and an inner peripheral surface extending from the rear opening to the front opening. The inner diameter of the front opening is equal to or smaller than the inner diameter of the hole, and the inner peripheral surface extends from the rear opening to the front opening so that the The shaft-shaped member is configured to have a tapered surface that reduces in diameter from the inner diameter of the rear side opening to the inner diameter of the front side opening, and the shaft-shaped member is attached to the stop ring arranged in the insertion hole portion from the rear in the insertion direction. A contactable tip surface is provided, and the stop ring can be moved along the taper surface by the tip surface as the shaft member moves forward in the insertion direction. The outer diameter of the tip surface portion is smaller than the inner diameter of the front opening, and is configured to have a size such that it can always abut on the stop ring before and after the diameter of the stop ring is reduced, and the shaft The length of the shaped member is such that the tip end surface can project forward in the insertion direction beyond the front opening , and the shaft-like member has a positioning mechanism capable of positioning the front opening with respect to the hole. The positioning mechanism includes a protruding shaft portion provided to protrude forward in the insertion direction at a position different from a portion of the distal end surface that contacts the stop ring, and the protruding shaft By directly engaging with the hole or engaging with a hole portion of a member provided inside the hole, the portion aligns the axis of the insertion hole with the axis of the hole. The point is that it is configured to match .

When the shaft-shaped member inserted through the tubular member is moved forward in the insertion direction, the stop ring accommodated in the insertion hole portion is reduced in diameter while being moved along the tapering surface. It is pushed out from the front side opening into the hole while it is in the state of There is no need for the conventional complicated installation work of carefully arranging the stop ring in the installation groove inside the hole while the diameter of the stop ring is reduced using an installation tool such as pliers. Therefore, according to the mounting jig, it has become possible to easily and quickly mount the stop ring.

The pushing of the shaft-shaped member into the cylindrical member can be easily performed by hitting the rear side of the shaft-shaped member in the insertion direction with a tool such as a hammer. No external power such as electric power or pressure is required. A flange portion may be provided on the rear side in the insertion direction of the shaft-like member in order to facilitate hitting with a tool such as a hammer.

Normally, a stop ring is used that corresponds to the dimensions of the hole or mounting groove to be mounted. Conventionally, the stop ring was attached using an attachment tool such as pliers. Therefore, since the diameter of the stop ring is appropriately reduced according to the amount of force applied by the operator using the installation tool, there is a risk that the stop ring that should not be installed is mistakenly installed.

On the other hand, by designing the mounting jig so as to correspond to the stop ring that should be mounted in the mounting groove, it is possible to avoid the risk of incorrectly mounting the stop ring that should not be mounted in the mounting groove.

According to the above configuration, the positioning mechanism can easily position the front opening with respect to the hole, so that the stop ring can be reliably fed from the front opening to the hole.

According to the above configuration, by directly or indirectly engaging the protruding shaft portion configured as the positioning mechanism with the hole, the axis of the insertion hole can be easily aligned with the axis of the hole, and the state can be achieved. can properly push the stop ring out of the front opening of the tubular member and into the hole.

If the hole has a bottom, the protruding shaft engages with the bottom, or if another member such as a hexagon socket bolt is present inside the hole, the hexagon socket is engaged. may In this case, the cross-sectional shape of the protruding shaft portion may be a hexagon corresponding to the hexagonal hole, or a circular shape that can be inscribed in the hexagonal hole.

In the present invention, the tapered surface is provided on the inner peripheral surface from between the front opening and the rear opening to the front opening, and the tapered surface is provided on the inner peripheral surface. It is preferable that the portion that is not covered has an inner diameter that is the same size as the inner diameter of the rear opening.

According to the above configuration, before the stop ring is pushed out into the hole, the outer peripheral portion of the stop ring is axially aligned with the tapered surface at the position where the outer peripheral portion abuts the tapered surface on the inner peripheral surface of the tubular member. It is held by the tip surface of the member. In this state, the attachment jig can be aligned with the hole in which the stop ring is to be attached, so the workability of attaching the stop ring is good.

According to the above configuration, by engaging the protruding engaging portion configured as the positioning mechanism with the inner wall of the hole, the axis of the insertion hole can be easily aligned with the axis of the hole. can properly push the stop ring out of the front opening of the tubular member and into the hole.

In the present invention, it is preferable to have a projection amount defining portion that defines the amount of projection of the distal end surface forward in the insertion direction from the front opening.

According to the above configuration, the amount of protrusion of the distal end face forward in the insertion direction from the front opening is specified by the amount of protrusion defining portion. The amount of protrusion is preferably an amount that allows the stop ring to be pushed out to reach the mounting groove, thereby avoiding the risk of the stop ring being pushed too far into the hole beyond the mounting groove. It should be noted that the tapered surface may have a shape that can contact the tapered surface entirely or a shape that can partially contact the tapered surface.

In the present invention, it is preferable that the projection amount regulating portion is composed of the tapered surface and a tapered surface provided on the shaft member and capable of coming into contact with the tapered surface.

According to the above-described configuration, the shaft-shaped member is provided with a tapered surface that abuts against the tapered surface of the cylindrical member, in consideration of the amount of pushing into the hole of the stop ring. The forward projection amount can be easily defined. It should be noted that the tapered surface may have a shape that can contact the tapered surface entirely or a shape that can partially contact the tapered surface.

In the present invention, a flange portion having an outer diameter larger than the inner diameter of the rear opening is provided on the rear side of the shaft-shaped member in the insertion direction, and the protrusion amount regulating portion corresponds to the above-described flange portion of the cylindrical member. It is preferable that it is composed of a rear end face in the insertion direction and a front end face of the flange portion that can come into contact with the rear end face.

According to the above-described configuration, the shaft-like member is provided with a flange portion that abuts on the rear end face in the insertion direction of the cylindrical member, in consideration of the amount of pushing into the hole of the stop ring. The amount of forward protrusion in the insertion direction can be easily defined. In addition, the flange part may have a shape that can contact the rear end face entirely, or a shape that can contact it partially.

In order to achieve the above-mentioned object, the characteristic structure of the mounting method of the present invention is a method of mounting a stop ring using a mounting jig having any of the above-described characteristic structures, A cylindrical joint provided at one end of the joined steel pipes facing each other, a shaft joint provided at the other end of the steel pipe and capable of being fitted to the cylindrical joint, the cylindrical joint and the shaft straddling the inward groove provided in the inner peripheral surface of the cylindrical joint of the cylindrical joint and the outer peripheral surface of the shaft-like joint of the shaft-like joint when the cylindrical joint is fitted to each other; a key member that can be arranged at a bridging position, the tubular joint is provided with a through hole that communicates from the outer peripheral surface of the tubular joint to the inside of the inward groove, and the key member is inserted into the through hole. In a steel pipe coupling mechanism configured to be attachable to a fixing member that is fixed to a bridging position, the cylindrical joint and the shaft-like joint are fitted to each other to attach the fixing member to the through hole, and the key member is attached. A mounting method in which a hole stop ring for preventing the fixing member from falling out of the through-hole is mounted in a mounting groove provided in the through-hole with respect to the steel pipe coupling mechanism fixed at the bridging position. a step of inserting a stop ring for a hole into an insertion hole portion of a cylindrical member that constitutes the mounting jig; aligning the front opening of the tubular member with the through-hole to which the stop ring is to be attached; pushing the shaft-shaped member against the tubular member to remove the stop ring; moving along the taper surface to push out into the through hole from the front side opening in a reduced diameter state and attach it to the mounting groove.

According to the above-described configuration, there is no need for the troublesome mounting work of carefully arranging the stop ring in the mounting groove inside the hole while reducing the diameter thereof using a mounting tool such as pliers as in the conventional art. Therefore, according to the mounting jig, it has become possible to easily and quickly mount the stop ring.

Explanatory drawing which cut|disconnects and shows a steel pipe pile partially. Explanatory drawing of the load transmission key provided in the steel pipe pile. Explanatory drawing of a stop ring. Explanatory drawing of the attachment jig which concerns on this invention. FIG. 4 is an explanatory diagram of attachment of a stop ring using an attachment jig according to the present invention; FIG. 4 is an explanatory diagram of attachment of a stop ring using an attachment jig according to the present invention; Explanatory drawing of the attachment jig which concerns on another embodiment of this invention. Explanatory drawing of the attachment jig which concerns on another embodiment of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a stop ring mounting jig according to the present invention and a stop ring mounting method using the mounting jig will be described below with reference to the drawings.

First, a case where a stop ring attachment jig according to the present invention is used for a stop ring attached to a steel pipe pile P shown in FIG. 1 will be described as an example.

The steel pipe pile P is provided with a steel pipe connection mechanism J that connects the steel pipe S in a locking state and a rotation locking state.

The steel pipe connecting mechanism J includes a tubular joint 10, a shaft joint 20, a rotation restraint key 30, and a load transmission key 40. As shown in FIG.

The tubular joint 10 and the axial joint 20 are welded to the upper end and lower end of the steel pipe S, respectively.

The rotation-preventing key 30 is provided in the cylindrical-side notch recess 11 provided in the cylindrical joint 10 and the shaft-like joint 20 when the cylindrical joint 10 and the shaft-like joint 20 are fitted to each other. It is a member for preventing relative rotation between the cylindrical joint 10 and the shaft-like joint 20 by being arranged in the key groove portion formed by the shaft-side cutout recess 21 formed on the shaft side.

The load transmission key 40 is provided in the inward groove portion 12 provided in the cylindrical joint 10 and the shaft-like joint 20 when the cylindrical joint 10 and the shaft-like joint 20 are fitted to each other. It is a member for preventing the cylindrical joint 10 and the shaft-like joint 20 from coming off by being arranged in the key groove portion composed of the outward groove portion 22 . The load transmission key 40 in this embodiment is a key member according to the present invention.

As shown in FIG. 2 , the depth of the inward groove portion 12 is configured to accommodate the load transmission key 40 . The depth of the outward groove portion 22 is approximately half the thickness of the load transmission key 40 .

The cylindrical joint 10 is provided with a through hole 13 that communicates with the inward groove portion 12 from the outer peripheral surface thereof. The through hole 13 in this embodiment is a hole according to the present invention.

A fixing member 50, which will be described later, can be attached to the through hole 13. As shown in FIG. The fixing member 50 is provided with a hexagonal hole 51 into which a tool such as a hexagonal wrench can be fitted when attaching the fixing member 50 to the through hole 13 .

The load transmission key 40 is pushed by the fixing member 50 attached to the through hole 13 from the housed position housed in the inward groove 12 to the bridging position straddling the inward groove 12 and the outward groove 22 . Thus, it is possible to prevent the cylindrical joint 10 and the shaft joint 20 from coming off.

As shown in FIG. 3 , a mounting groove 14 is formed in the inner wall of the through hole 13 at a location near the outer peripheral surface of the tubular joint 10 . A hole stop ring 60 can be attached to the attachment groove 14 .

When attaching the stop ring 60 to the attachment groove 14, the attachment jig 70 according to the present invention is used.

As shown in FIG. 4, the mounting jig 70 is composed of a cylindrical member 71 and a shaft member 72 having a size and weight that can be gripped by a worker. The tubular member 71 and the shaft-shaped member 72 are manufactured by cutting carbon steel.

The cylindrical member 71 is formed of a cylindrical body having a diameter and length of about several tens of millimeters, and an insertion hole 73 through which the stop ring 60 can be inserted is provided at the axial center position of the cylindrical body.

The insertion hole portion 73 includes a rear opening 74 located on the rear side in the insertion direction D of the shaft-shaped member 72 into the cylindrical member 71, a front opening 75 located on the front side in the insertion direction D, and a rear opening 74. and an inner peripheral surface 76 extending from the front opening 75 .

Most of the inner peripheral surface 76 has the same size as the inner diameter ID ₇₄ of the rear opening 74 , but a portion of the inner peripheral surface 76 near the front opening 75 has the same size as the inner diameter ID 74 of the rear opening 74 . A taper surface 77 is provided that tapers from ₇₄ to an inner diameter ID ₇₅ at the front opening 75 .

The stop ring 60 is reduced in diameter when it is attached to the attachment groove 14 of the through hole 13 . The inner diameter ID ₇₄ of the rear opening 74 is configured to be equal to or larger than the outer diameter OD ₆₀ of the stop ring 60 so that the stop ring 60 can be loosely inserted into the insertion hole 73 before its diameter is reduced. .

The size of the inner diameter ID ₇₅ of the front opening 75 is equal to or smaller than the inner diameter ID ₁₃ of the through hole 13 .

The shaft-like member 72 has a shaft portion 78 that can move in the insertion hole portion 73 of the cylindrical member 71 and a flange portion 79 that is provided on the rear side in the insertion direction D. As shown in FIG.

Most of the shaft portion 78 has an outer diameter OD ₇₈ that is slightly smaller than the inner diameter ID ₇₆ of the inner peripheral surface 76 . A tip end surface 80 that can contact the stop ring 60 arranged in the insertion hole portion 73 from behind in the insertion direction D when inserted, and a tapered surface 81 that can contact the tapered surface 77 of the insertion hole portion 73 . , is provided.

The axial member 72 has an outer diameter of the thinnest portion of the tapered surface 81 , that is, an outer diameter OD ₈₀ of the tip surface 80 portion, which is smaller than an inner diameter ID ₇₅ of the front opening 75 . It is sized so that it can always abut on the stop ring 60 before and after the diameter is reduced.

The flange portion 79 is provided to facilitate hitting with a tool such as a hammer when the shaft-like member 72 is pushed into the cylindrical member 71 . In addition, the presence of the flange portion 79 prevents mistaking the insertion direction of the shaft-like member 72 with respect to the cylindrical member 71 .

Usually, the stop ring 60 is used that corresponds to the dimensions of the through hole 13 and the mounting groove 14 to be mounted. By designing the mounting jig 70 so as to correspond to the stop ring 60, the risk of incorrectly mounting a stop ring that should not be mounted in the through hole 13 and the mounting groove 14 is avoided.

When the shaft-like member 72 is fully pushed into the insertion hole portion 73 of the tubular member 71 , that is, when the tapered surface 81 comes into contact with the tapered surface 77 of the insertion hole portion 73 , the tip surface 80 of the shaft-like member 72 contacts the tubular member 71 . It is constructed so that it can slightly protrude forward in the insertion direction D from the front side opening 75 of the .

The forward end surface 80 projects from the front opening 75 of the tubular member 71 in the insertion direction D into the through hole 13 of the tubular joint 10 from the front opening 75 of the tubular member 71 . The amount is set so that the stop ring 60 is pushed in to a depth corresponding to the mounting groove 14 . This prevents the stop ring 60 from being pushed too far into the through hole 13 beyond the mounting groove 14 .

This amount of protrusion is defined in advance by the shapes of the tapered surface 77 and the tapered surface 81 . Therefore, the tapered surface 77 and the tapered surface 81 in the present embodiment form the projecting amount regulating portion according to the present invention. At this time, the tapered surface 81 and the tapered surface 77 may have a shape that allows them to come into full contact with each other, or may have a shape that allows them to come into partial contact with each other.

As shown in FIGS. 5 and 6, the length of the shaft portion 78 of the shaft-shaped member 72 is the same as that of the cylindrical member 71 in the insertion direction even when the tapered surface 81 contacts the tapered surface 77 . It is preferable that the rear end face 82 at D and the front end face 83 of the flange portion 79 facing the rear end face 82 are separated by a certain distance.

With the above-described configuration, when the shaft-like member 72 inserted into the cylindrical member 71 is pushed forward in the insertion direction D of the shaft-like member 72 , the stop ring 60 accommodated in the insertion hole portion 73 is pushed toward the tapered surface 77 . , and pushed out from the front opening 75 into the through-hole 13 in the state of being reduced in diameter.

The shaft-like member 72 has a positioning mechanism to enable positioning of the front opening 75 with respect to the through hole 13 .

The positioning mechanism is composed of a protruding shaft portion 84 that protrudes forward in the insertion direction D at the center of the tip surface 80 .

The protruding shaft portion 84 is sized to engage with the hexagonal hole 51 of the fixing member 50 . The cross-sectional shape of the projecting shaft portion 84 may be a hexagon corresponding to the hexagonal hole 51 or a circular shape that can be inscribed in the hexagonal hole 51 . The corners of the tip are chamfered.

Further, the projecting shaft portion 84 extends from the front opening 75 in the insertion direction D when the tip end surface 80 of the shaft member 72 is in contact with the stop ring 60 accommodated in the tubular member 71 . When the cylindrical member 71 projects forward and is in a position corresponding to the through hole 13 to which the stop ring 60 is to be attached, it fits into the hexagonal hole 51 of the fixing member 50 screwed into the through hole 13 . It is configured to have a length that allows insertion and does not contact the bottom of the hexagonal hole 51 even when the tip surface 80 of the shaft-like member 72 protrudes most forward in the insertion direction D from the front opening 75. It is

By aligning the axial center of the projecting shaft portion 84 with the axial center of the hexagonal hole 51, the axial center of the shaft portion 78 of the shaft-shaped member 72, the axial center of the tubular member 71 into which the shaft-shaped member 72 is inserted, and the tubular member 72 are inserted. The axial center of the front opening 75 of the shaped member 71 coincides with each other so that the stop ring 60 can be appropriately pushed into the through hole 13 positioned with respect to the front opening 75 .

Next, the case where the method of attaching the stop ring 60 using the attachment jig 70 according to the present invention is used for the stop ring 60 attached to the steel pipe pile P shown in FIG. 1 will be described.

In connecting the steel pipe piles P by the steel pipe connecting mechanism J, first, the tubular joint 10 of the upper steel pipe pile P and the axial joint 20 of the lower steel pipe pile P are properly fitted. Next, the fixing member 50 is screwed into the through hole 13 of the tubular joint 10, and the load transmission key 40 is positioned so as to straddle the inward groove 12 of the tubular joint 10 and the outward groove 22 of the shaft joint 20. be placed in A stop ring 60 is attached to prevent the fixing member 50 from coming off.

In the mounting method of the stop ring 60 , first, the mounting groove 14 of the through hole 13 is inserted into the insertion hole portion 73 of the cylindrical member 71 with the shaft member 72 extracted from the cylindrical member 71 of the mounting jig 70 . Place the stop ring 60 to be attached to the .

The shaft member 72 is inserted into the insertion hole 73 in which the stop ring 60 is arranged, and the stop ring 60 is held between the tapered surface 77 of the cylindrical member 71 and the tip surface 80 of the shaft member 72. .

Then, the mounting jig 70 is positioned by inserting the projecting shaft portion 84 into the hexagonal hole 51 with respect to the through hole 13 to which the stop ring 60 is to be mounted.

While maintaining the alignment of the mounting jig 70 with respect to the through hole 13 , the shaft member 72 is pushed into the cylindrical member 71 by hitting the flange portion 79 with a tool such as a hammer.

At this time, the stop ring 60 moves along the taper surface 77 while being reduced in diameter, and is pushed out from the front opening 75 into the through hole 13 .

Since the amount of forward projection in the insertion direction D from the front opening 75 of the cylindrical member 71 of the distal end surface 80 is defined, the pushed out stop ring 60 expands in the mounting groove 14 to the state before diameter reduction. diameter and properly installed in that position.

By performing such work for all the through holes 13 provided in the tubular joint 10, the stop ring 60 prevents the fixing member 50 for fixing the load transmission key 40 from falling out of the through holes 13. prevented. Therefore, there is no fear that the connection between the cylindrical joint 10 and the shaft joint 20 will be released.

In the above-described embodiment, the case where the cylindrical member 71 is composed of a cylindrical body has been described, but this is not the only option. The cylindrical member 71 may be composed of a prismatic body.

In the embodiment described above, the case where the shaft-like member 72 has the flange portion 79 has been described, but this is not the only option. The shaft-like member 72 does not have to have the flange portion 79 .

In the above-described embodiment, the tapered surface 77 and the tapered surface 81 constitute the projecting amount defining portion, but the present invention is not limited to this.

As shown in FIG. 7, the tapered surface 81 provided on the shaft portion 78 of the shaft member 72 is configured so as not to come into contact with the tapered surface 77 of the insertion hole portion 73 of the tubular member 71. The rear end surface 82 of the flange portion 71 and the front end surface 83 of the flange portion 79 may be in contact with each other. The front end surface 83 of the flange portion 79 may have a shape that can fully contact the rear end surface 82 or a shape that can partially contact the rear end surface 82 .

In the embodiment described above, regarding the positioning mechanism, the protruding shaft portion 84 provided on the shaft-like member 72 is engaged with the hexagonal hole 51 of the fixing member 50 screwed into the through-hole 13, thereby providing a mounting jig. Although the configuration in which the tool 70 and the through hole 13 are positioned has been described, the configuration is not limited to this.

As shown in FIG. 8, the positioning mechanism is a protruding engagement portion provided to protrude forward in the insertion direction D on the front end surface of the cylindrical member 71 facing the through hole 13. 85. By engaging with the inner wall of the through-hole 13 , the projecting engaging portion 85 aligns the axial center of the front opening 75 with the axial center of the through-hole 13 . This makes it possible to align the mounting jig 70 . In addition, the projecting engagement portion 85 may be provided over the entire circumference of the front opening 75 or may be provided in a part of the front opening 75 .

In the above-described embodiment, the stop ring mounting jig is used for the stop ring 60 attached to the steel pipe pile P in the present invention, and the stop ring mounting method using the mounting jig is Although the case where it is executed with respect to the stop ring 60 attached to the steel pipe pile P has been described, it is not limited to this.

When the stop ring 60 for a hole is attached to a mounting groove provided in the inner wall of a bottomed or penetrating hole provided in an object, the stop ring mounting jig according to the present invention is used. A stop ring mounting method using a mounting jig is used.

The above-described embodiments are all examples of the present invention, and the present invention is not limited by the description, and the specific configuration of each part can be appropriately changed and designed within the scope of the effects of the present invention. be.

10: Cylindrical joint (object)
12: Inward groove portion 13: Through hole (hole)
14 : Mounting groove 20 : Shaft-shaped joint 50 : Fixing member 51 : Hex socket 60 : Stop ring 70 : Mounting jig 71 : Cylindrical member 72 : Shaft-shaped member 73 : Insertion hole 74 : Rear opening 75 : Front opening 76: inner peripheral surface 77: tapered surface 78: shaft portion 79: flange portion 80: tip end surface 81: tapered surface 82: rear end surface 83: front end surface 84: protruding shaft portion 85: protruding engagement portion D: insertion direction

Claims (6)

A mounting jig used when mounting a stop ring for a hole to a mounting groove provided on the inner wall of a hole provided in an object,
a cylindrical member having an insertion hole through which the stop ring to be attached to the mounting groove can be inserted; and a shaft-shaped member that can be extruded into the hole,
The insertion hole portion includes a rear opening located on the rear side in the insertion direction of the shaft-shaped member into the cylindrical member, a front opening located on the front side in the insertion direction, and a front opening extending from the rear opening to the front side. and an inner peripheral surface leading to the opening,
The size of the inner diameter of the rear side opening is configured so that the stop ring before diameter reduction can be loosely inserted,
The inner diameter of the front opening is equal to or less than the inner diameter of the hole,
The inner peripheral surface is configured to have a tapered surface that decreases in diameter from the inner diameter of the rear side opening to the inner diameter of the front side opening from the rear side opening to the front side opening,
The shaft-like member has a tip end face that can contact the stop ring arranged in the insertion hole portion from behind in the insertion direction. configured so that the stop ring can be moved along the tapering surface by the tip surface,
The size of the outer diameter of the tip surface portion is smaller than the inner diameter of the front side opening, and is configured to have a size that can always abut on the stop ring before and after the diameter of the stop ring is reduced,
The length of the shaft-shaped member is configured such that the tip end surface can protrude forward in the insertion direction from the front opening ,
The shaft-shaped member has a positioning mechanism capable of positioning the front opening with respect to the hole,
The positioning mechanism comprises a protruding shaft portion provided to protrude forward in the insertion direction at a position different from a portion of the distal end surface that contacts the stop ring,
The protruding shaft part is directly engaged with the hole or engaged with a hole part of a member provided inside the hole so that the axis of the insertion hole part is aligned with the hole. A mounting jig, characterized in that it is constructed so as to be aligned with the axis . The tapered surface is provided from between the front opening and the rear opening to the front opening on the inner peripheral surface,
2. The mounting jig according to claim 1, wherein a portion of the inner peripheral surface where the tapered surface is not provided has an inner diameter equal to the inner diameter of the rear opening. 3. The mounting jig according to claim 1, further comprising a projection amount regulating portion that regulates the amount of projection of the distal end surface forward in the insertion direction from the front opening. 4. The mounting jig according to claim 3 , wherein the projecting amount regulating portion comprises the tapered surface and a tapered surface provided on the shaft member and capable of coming into contact with the tapered surface. A flange portion having an outer diameter larger than the inner diameter of the rear opening is provided on the rear side of the shaft-shaped member in the insertion direction,
4. The attachment according to claim 3 , wherein the projection amount regulating portion comprises a rear end face of the cylindrical member in the insertion direction and a front end face of the flange portion that can contact the rear end face. jig. A stop ring mounting method using the mounting jig according to any one of claims 1 to 5 ,
a cylindrical joint provided at one end of steel pipes facing each other of steel pipes adjacent to each other in the axial direction; a shaft-like joint provided at the other end of the steel pipe and capable of being fitted into the cylindrical joint;
When the cylindrical joint and the shaft-like joint are fitted to each other, an inward groove portion provided in the inner peripheral surface of the cylindrical joint of the cylindrical joint and the shaft-like joint of the shaft-like joint a key member that can be arranged at a bridging position straddling the outer peripheral surface,
The tubular joint is provided with a through hole that communicates from the outer peripheral surface of the tubular joint to the inside of the inward groove, and a fixing member that fixes the key member to the bridging position can be attached to the through hole. In the steel pipe connection mechanism,
With respect to the steel pipe connection mechanism in which the cylindrical joint and the shaft joint are fitted together, the fixing member is attached to the through hole, and the key member is fixed at the bridging position,
In the mounting method for mounting a hole stop ring for preventing the fixing member from falling out of the through-hole into a mounting groove provided in the through-hole,
a step of inserting a stop ring for a hole into an insertion hole portion of a cylindrical member that constitutes the mounting jig;
a step of inserting a shaft-like member constituting the mounting jig into the insertion hole through which the stop ring is inserted;
aligning the front opening of the tubular member with the through hole to which the stop ring is to be attached;
The shaft-shaped member is pushed into the cylindrical member, and the stop ring is moved along the tapering surface to reduce its diameter, and is pushed out from the front opening into the through hole and attached to the mounting groove. A mounting method, comprising:

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