JP7294559B1 - Mechanical joints, steel pipes, structures, construction methods for structures, fixing methods for mechanical joints, joining methods for mechanical joints, methods for removing mechanical joints, methods for designing mechanical joints, methods for manufacturing mechanical joints - Google Patents

Abstract

A mechanical joint 1 according to the present invention includes a tubular PIN joint 3 and a BOX joint 5 joined to the PIN joint 3. A stepped portion 9 is formed on the proximal end side of the PIN joint 3, and the BOX joint 5 The tip portion 10 is configured to contact the stepped portion 9 to complete the fitting state, and is formed to face the outer peripheral surface of the PIN joint 3 and the inner peripheral surface of the BOX joint 5 in the completed fitting state. , the annular groove 11 of one or more stages inclined with respect to the pipe axis direction, and the annular groove 11 of the PIN joint 3 or the BOX joint 5 can be stored and fitted so as not to interfere with the insertion of the PIN joint 3 into the BOX joint 5. A ring member 13 that can be arranged so as to straddle the PIN joint 3 side and the BOX joint 5 side within the annular groove 11 in the completed state.

Description

The present invention relates to a mechanical joint applied to a steel pipe pile or a steel pipe sheet pile, a steel pipe to which the mechanical joint is attached, a structure having the steel pipe as a component, a construction method of the structure, a fixing method of the mechanical joint, a machine The present invention relates to a method of joining a type joint, a method of removing a mechanical joint, a method of designing a mechanical joint, and a method of manufacturing a mechanical joint.

Joining of steel pipe piles and steel pipe sheet piles has traditionally been done mainly by on-site welding, but in recent years, joining by mechanical joints has been increasing due to fewer technicians, shorter construction periods, and quality control. In steel pipe piles and steel pipe sheet piles, a common method is to manufacture tubular joint members separately from steel pipes, attach the joint members to the ends of the steel pipes to be joined by welding, and join the joint members together.

Joints must have a structure that can transmit loads such as compression, tension, shear and torsion that act during construction and service of piles. In this respect, compression can be easily transmitted by bringing the end surfaces of the joint members into surface contact, and shearing can be easily transmitted by inserting the male tube into the female tube to form a double tube state. However, tensile and torsional loads cannot be transmitted by mere insertion and surface contact, and some structural ingenuity is required.

Various methods have been devised and put into practical use. For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 10-311028), a joint member is formed into a multi-threaded shape, and threads of a PIN joint (PIN JOINT) and a BOX joint (BOX JOINT) are meshed and tensioned by rotational joining. A structure capable of transmitting loads is disclosed. A torsional load in the normal direction can be transmitted by tightening the screw completely, but a torsional load in the reverse direction cannot be transmitted. to transmit the torsional load in the reverse direction.

In addition, in Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-36329), a plurality of slits in the pipe axial direction are provided in either the PIN joint or the BOX joint in the circumferential direction, and a joint member divided by the slits is provided. Joint structures are disclosed that are machined for radial elastic deformation. In this joint structure, the split joint member is provided with a convex portion, and the other member is provided with a concave portion that meshes with the convex portion when the fitting is completed. Patent Document 2 discloses that when a compressive load is applied by its own weight or the like when inserting the joint, the split joint member is flexed in the radial direction, and when it returns to its original shape after the insertion is completed, the convex portion and the concave portion are engaged with each other. , discloses a structure capable of transmitting tensile loads. Also, in this structure, bolts are arranged on the outer peripheral surface in the same manner as in Patent Document 1, and it is possible to transmit a torsional load.

As another method, Patent Document 3 (Japanese Patent Application Laid-Open No. 11-36285) discloses a structure in which a groove is provided in each of the PIN joint and the BOX joint so that the positions in the axial direction match when the fitting is completed. ing. In this structure, either the PIN joint or the BOX joint accommodates a ring-shaped member whose diameter can be changed so as to fit into a groove. As a result, when the fitting is completed, the ring member is moved in the radial direction, and the ring member is arranged so as to straddle the PIN joint and the BOX joint, thereby transmitting the tensile load. Since the torsional load cannot be transmitted even in this structure, it is necessary to arrange bolts as in Patent Documents 1 and 2, or to arrange a separate anti-rotation mechanism as in Patent Document 4 (Japanese Patent Application Laid-Open No. 2000-319874). is.

JP-A-10-311028 JP-A-2004-36329 JP-A-11-36285 JP-A-2000-319874

In a threaded joint such as that of Patent Document 1, even if the number of threads is increased, it is unavoidable to rotate the steel pipe at the time of joining. There is

In addition, in the elastically deformable joint as in Patent Document 2, when the joint is thick, the load for elastically deforming increases, and there are cases where fitting cannot be performed only by its own weight. Although it is possible to reduce the load by increasing the number of slits or lengthening them, the processing cost increases and the shear load transmission capacity decreases.

On the other hand, unlike Patent Documents 1 and 2, the joint disclosed in Patent Document 3 requires a ring-shaped member to constitute the joint, but does not require rotation at the time of joining and does not require a load for elastic deformation. is also unnecessary. However, in Patent Document 3, as in Patent Documents 1 and 2, the tensile load and torsional load transmission mechanisms are separate structures. Patent Document 4, which is similar to Document 3, uses a detent mechanism. Therefore, in order to ensure a strength that can transmit a torsional load equivalent to steel pipes, it is necessary to increase the number of bolts, thicken the thickness of the bolts, and increase the number of anti-rotation mechanisms. There is a problem of increasing

The present invention has been made in order to solve such problems, and provides a mechanical joint that can transmit a torsional load without the need to rotate or apply a large load to the joint, and without incurring additional costs. Installed steel pipes, structures having the steel pipes as constituent elements, construction methods for the structures, methods for fixing mechanical joints, methods for joining mechanical joints, methods for removing mechanical joints, methods for designing mechanical joints, mechanical It is an object of the present invention to provide a method of manufacturing a type joint.

(1) A mechanical joint according to the present invention is a mechanical joint that includes a tubular PIN joint and a BOX joint joined to the PIN joint, and is attached to an end of a steel pipe to join the steel pipes together,
A stepped portion is formed on the base end side of the PIN joint, and when the PIN joint and the BOX joint are fitted together, the tip portion of the BOX joint comes into contact with the stepped portion to complete the fitting state. configured to
an annular groove having one or more steps, which is formed so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state, and which is inclined with respect to the pipe axial direction;
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the mated state. a ring member that can be arranged so as to straddle the joint side.

(2) Further, the mechanical joint according to the present invention is the mechanical joint described in (1) above,
one or more notches in the ring member;
a confirmation hole provided through the annular groove of the BOX joint at a position corresponding to the notch of the ring member;
In the annular groove of the PIN joint, at positions corresponding to one end and the other end of the notches of the ring member arranged in both annular grooves so as to straddle the PIN joint side and the BOX joint side, respectively. a threaded hole;
is provided.

(3) Further, a mechanical joint according to the present invention is the mechanical joint described in (1) or (2) above,
one or more notches in the ring member;
a threaded hole into which a screw is screwed in the BOX joint so that the ring member can be pushed radially by the screw;
is provided.

(4) A mechanical joint according to the present invention is a mechanical joint that includes a tubular PIN joint and a BOX joint joined to the PIN joint, and is attached to the ends of steel pipes to join the steel pipes together. hand,
A stepped portion is formed on the base end side of the PIN joint, and when the PIN joint and the BOX joint are fitted together, the tip portion of the BOX joint comes into contact with the stepped portion to complete the fitting state. configured to
a helical groove having a helical shape of one or more turns formed so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state;
The PIN joint side and the BOX joint can be stored in the spiral groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint. a helical member that can be arranged so as to straddle the joint side.

(5) Further, a steel pipe according to the present invention has a PIN joint or a BOX joint of the mechanical joint according to any one of (1) to (4) above attached to one end and/or the other end. It is.

(6) A structure according to the present invention includes a plurality of steel pipes connected by the mechanical joint according to any one of (1) to (4) above.

(7) Further, a structure construction method according to the present invention is the structure construction method described in (6) above, wherein the position of one of the steel pipes with joints to be connected is constrained in the axial direction of the steel pipe. In this state, the other steel pipe with a joint is aligned with the one steel pipe with a joint and inserted and fitted.

(8) Further, a method for fixing a mechanical joint according to the present invention includes fixing a ring member to the PIN joint of the mechanical joint according to any one of (1) to (3) above with a fixing member. A method for fixing a mechanical joint, comprising:
storing the ring member in the annular groove of the PIN joint with its diameter reduced;
In the stored state, the ring member is fixed by covering the entire circumference of the ring member with the fixing member and pushing the ring member in the radial direction with the fixing member.

(9) Further, a method for fixing a mechanical joint according to the present invention includes fixing a ring member to a PIN joint or a BOX joint of the mechanical joint according to any one of (1) to (3) above. A method for fixing a mechanical joint that is fixed with
storing the ring member in a reduced diameter state in the annular groove of the PIN joint, or storing the ring member in an expanded state in the annular groove of the BOX joint;
The ring member is fixed by providing the fixing member across the notch of the ring member while it is stored, and suppressing the expansion or contraction of the diameter of the ring member with the fixing member. It is.

(10) Further, a method for fixing a mechanical joint according to the present invention includes fixing a ring member to the PIN joint of the mechanical joint according to any one of (1) to (3) above with a fixing member. A method for fixing a mechanical joint, comprising:
storing the ring member in the annular groove of the PIN joint in a reduced diameter state;
The first fixing member is provided across the notch of the ring member in the stored state, and the first fixing member suppresses expansion of the diameter of the ring member,
The ring member is fixed by covering the entire circumference of the ring member with the second fixing member and pushing the ring member in the radial direction with the second fixing member in the stored state. is.

(11) A mechanical joint joining method according to the present invention is a mechanical joint joining method for joining the mechanical joint according to any one of (1) to (3) above,
Using the mechanical joint fixing method according to any one of (8) to (10) above, the ring member is fixed in advance to the PIN joint or the BOX joint with a fixing member,
The fixing member is removed during or after the fitting of the PIN joint and the BOX joint is completed.

(12) Further, a mechanical joint joining method according to the present invention is a mechanical joint joining method for joining the mechanical joint according to (2) above,
After fitting the PIN joint and the BOX joint, a screw is screwed into each screw hole of the PIN joint,
The screw that is screwed in suppresses the diameter reduction of the ring member.

(13) Further, a method for removing a mechanical joint according to the present invention is a method for removing a mechanical joint for removing the mechanical joint according to (3) above,
With the PIN joint and the BOX joint completed, screw the screw into the threaded hole of the BOX joint,
pushing the ring member radially with the screw until the ring member is retracted within the annular groove of the PIN joint;
The PIN joint and the BOX joint are removed while the ring member is housed in the annular groove of the PIN joint.

(14) Further, the method for designing a mechanical joint according to the present invention includes a tubular PIN joint and a BOX joint joined to the PIN joint. A design method for
A stepped portion is set on the base end side of the PIN joint,
setting the front end portion of the BOX joint in contact with the stepped portion in a state in which the PIN joint and the BOX joint are completely fitted, and
one or more annular grooves inclined with respect to the pipe axis direction are arranged so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state,
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the fitted state. The ring member is set so that it can be arranged so as to straddle the side.

(15) Further, the method for designing a mechanical joint according to the present invention includes a tubular PIN joint and a BOX joint joined to the PIN joint. A design method for
A stepped portion is set on the base end side of the PIN joint,
setting the front end portion of the BOX joint in contact with the stepped portion in a state in which the PIN joint and the BOX joint are completely fitted, and
A spiral groove having a spiral shape of one or more turns is arranged so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state,
The PIN joint side and the BOX joint can be stored in the spiral groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and in the fitted state, the PIN joint side and the BOX joint can be stored in the spiral groove. The spiral member is set so that it can be arranged so as to straddle the side.

(16) In addition, a method for manufacturing a mechanical joint according to the present invention includes a tubular PIN joint and a BOX joint joined to the PIN joint, and is attached to the ends of steel pipes to join the steel pipes. A manufacturing method of
A stepped portion is formed on the base end side of the PIN joint,
forming a front end portion of the BOX joint in contact with the stepped portion in a mating state in which the PIN joint and the BOX joint are completely fitted;
One or more annular grooves inclined at a constant angle with respect to the pipe axis direction are formed so as to face the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state, respectively;
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the fitted state. The ring member is formed so that it can be arranged so as to straddle the sides.

(17) In addition, a method for manufacturing a mechanical joint according to the present invention includes a tubular PIN joint and a BOX joint joined to the PIN joint, and is attached to the ends of steel pipes to join the steel pipes. A manufacturing method of
A stepped portion is formed on the base end side of the PIN joint,
forming a front end portion of the BOX joint in contact with the stepped portion in a mating state in which the PIN joint and the BOX joint are completely fitted;
A spiral groove having a spiral shape of one turn or more is formed so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state,
The PIN joint side and the BOX joint can be stored in the spiral groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and in the fitted state, the PIN joint side and the BOX joint can be stored in the spiral groove. A helical member is formed so that it can be arranged so as to straddle the sides.

In the present invention, the PIN joint and the BOX joint are provided with inclined annular grooves, and when the PIN joint is completely inserted into the BOX joint, the ring member is arranged to straddle the annular grooves of both the PIN joint and the BOX joint. Thus, not only the tensile load but also the torsional load between the steel pipes to be joined can be transmitted by the ring member without providing a separate member such as a bolt.

FIG. 1 is an explanatory diagram of a mechanical joint according to Embodiment 1. FIG. FIG. 2 is an explanatory diagram of a mechanical joint according to another aspect 1 of the first embodiment. FIG. 3 is an explanatory diagram of a mechanical joint according to another aspect 2 of the first embodiment. FIG. 4 is an explanatory diagram of a mechanical joint according to another aspect 3 of the first embodiment. FIG. 5 is an explanatory diagram of a mechanical joint according to another aspect 4 of the first embodiment. FIG. 6 is an explanatory diagram of a mechanical joint according to another aspect 5 of the first embodiment. FIG. 7 is an explanatory diagram of a mechanical joint according to Embodiment 2. FIG. FIG. 8 is an explanatory diagram of a mechanical joint according to Embodiment 3. FIG. FIG. 9 is an explanatory diagram of a mechanical joint according to Embodiment 4. FIG.

[Embodiment 1]
A mechanical joint according to this embodiment will be described with reference to FIG. 1(a) shows the state before the joint is inserted, FIG. 1(b) shows the state after the joint is inserted and before the fitting is completed, and FIG. 1(c) shows the state after the fitting is completed.

As shown in FIG. 1(a), the mechanical joint 1 according to the present embodiment comprises a tubular PIN joint 3 and a BOX joint 5 into which the PIN joint 3 is inserted and fitted, and is attached to the end of a steel pipe 7. It joins the steel pipes 7 together. A stepped portion 9 is formed on the base end side of the PIN joint 3, and as shown in FIG. 9 and is configured to be in a mated state. Here, FIG. 1(b-1) is a cross-sectional view of the mechanical joint 1 viewed from the radial direction, and FIG. 1(b-2) is a cross-sectional view of the mechanical joint 1 viewed from the central axis direction. The same applies to FIGS. 1(c-1) and 1(c-2). In this embodiment, the PIN joint 3 is the same as what is called an inner joint or a male joint. Also, in the present embodiment, the BOX joint 5 is the same as what is called an outer joint or a female joint.

A PIN joint 3 is a joint inside the mechanical joint 1 . Also, the BOX joint 5 is a joint outside the mechanical joint 1 . Annular grooves 11M and 11F are formed so as to face the outer peripheral surface of the PIN joint 3 and the inner peripheral surface of the BOX joint 5 respectively in the fitted state, and are inclined with respect to the axial direction of the mechanical joint 1. It is The inclination angles of the annular grooves 11M and 11F may be appropriately set as long as the ring member does not rotate when a torsional load is applied. The inclination angles of the annular grooves 11M and 11F with respect to the axial direction are preferably in a state of having a constant angle so as to form a straight line when viewed from the radial direction of the mechanical joint 1 . The upper limit of the inclination angle of the annular grooves 11M and 11F with respect to the axial direction may be 5° or less in the axial direction of the mechanical joint 1 when the radial direction of the mechanical joint 1 is 0°. preferable. This is because if the inclination is too large, the length of the joint will be long and the cost will be high.

The annular grooves 11M and 11F formed in the PIN joint 3 and the BOX joint 5, respectively, form the annular groove 11 which is an elliptical closed space when the joints are put in a completely fitted state. Furthermore, the mechanical joint 1 is provided with an annular ring member 13 . The ring member 13 can be stored in the annular groove 11M of the PIN joint 3 so as not to interfere with the fitting of the PIN joint 3 and the BOX joint 5, and the ring member 13 can be stored in the annular groove 11 of the PIN joint 3 in the completed state of fitting. It can be arranged so as to straddle the groove 11M and the annular groove 11F of the BOX joint 5 .

As shown in FIG. 1(b-2), the ring member 13 has a notch 15 at one place in the circumferential direction and has a spring structure that expands and contracts in the radial direction. The ring member 13 is provided with drilled holes 18 at several locations, and the PIN joint 3 is provided with tapped holes 17 at several locations corresponding to the drilled holes 18 . is fixed along the outer peripheral surface of the PIN joint 3. This is a structure that has a larger diameter than the outer diameter of the annular groove 11M in an unfixed state and fits perfectly into the annular groove 11M.

In this specification, it is sufficient that the drilled hole 18, the tapped hole 17, the through tapped hole 29, and the threaded holes 31, 43 are combined with a "screw". In particular, any "male screw" can be used, and it may be appropriately selected according to the purpose of use of the screw. Further, in the present embodiment, the bolt 19, the bolt screws 33, 44, 47, and the set screw 34 are described as examples of "screws."

The ring member 13 can be produced, for example, by bending a long flat plate of a predetermined length. In this case, a notch 15 is formed by a gap when the ends of the flat plate are opposed to each other by bending. In addition to the above method, the notch 15 may be formed by cutting a part of the ring-shaped member. Moreover, although only one notch 15 is provided in the circumferential direction of the ring member 13 in FIG. 1, two notches 15 may be provided. In this case, it is preferable that the second notch 15 be provided in the vicinity of the one notch 15 and at a position where the spring structure of the ring member 13 can be maintained. In order to make the most of the spring structure of the ring member 13, it is most preferable that the number of notches 15 is one.

In order to prevent the head of the bolt 19 from protruding from the outer peripheral surface of the ring member 13, the drilled hole 18 provided in the ring member 13 is provided with a recess 21 in which the head of the bolt 19 is accommodated. It has a stepped hole. Also, the drilled hole 18 is elongated in the circumferential direction of the ring member 13 so as to accommodate expansion and contraction of the ring member 13 (FIG. 1(b-2) enlarged view, arrow BB view, (See the cross-sectional view taken along line CC). 1(b-2) and 1(c-2), the details of the drill hole 18 and the recess 21 are omitted in order to avoid complication of the drawings.

The bolt 19 that fixes the ring member 13 needs to be loosened after the PIN joint 3 has been completely inserted into the BOX joint 5 . In order to enable this operation, the BOX joint 5 has a through hole 23 at a position opposite to the position of the bolt 19 when the fitting is completed, as shown in FIGS. 1(b-2) and (c-2). is provided.

A fitting operation of the mechanical joint 1 configured as described above will be described. Before inserting the PIN joint 3 into the BOX joint 5, as shown in FIG. and insert the PIN joint 3 into the BOX joint 5. Matching the direction means that the annular groove 11M of the PIN joint 3 and the annular groove 11F of the BOX joint 5 are inclined in the same direction. It is positioned so as to face the bolt 19 of the PIN joint 3 in the mated state.

As shown in FIG. 1B, the insertion of the PIN joint 3 into the BOX joint 5 is completed in a state where the stepped portion 9 of the PIN joint 3 and the tip of the BOX joint 5 are in contact with each other. In this state, the annular grooves 11M and 11F formed in the PIN joint 3 and the BOX joint 5 respectively form the annular groove 11 consisting of an elliptical closed space, and the ring member stored in the annular groove 11M of the PIN joint 3 13 is arranged to face the annular groove 11F of the BOX joint 5 .

Next, by inserting a tool into the through-hole 23 and loosening the bolt 19, the ring member 13 is expanded by its own spring force as shown in FIG. The fitting is completed by being arranged so as to straddle both of the annular grooves 11F. The ring member 13 is expanded by its own spring force, and is arranged in the annular grooves 11M and 11F while maintaining this state. Therefore, after the fitting is completed, the bolt 19 is no longer necessary for the function of the joint. Therefore, even if the bolt 19 comes off or breaks due to vibration or the like, the function of the joint is not affected.

In the mated state, as shown in FIG. 1(c), the compressive force is transmitted mainly by the contact pressure between the stepped portion 9 of the PIN joint 3 and the tip portion 10 of the BOX joint 5, and the tensile force is mainly transmitted by the ring joint. It is transmitted by the bearing pressure of the member 13 . Further, the torsional force is mainly transmitted by shearing the ring member 13, and the shearing force is mainly transmitted by the double tube portion of the PIN joint 3 and the BOX joint 5.

As described above, in the present embodiment, the PIN joint 3 and the BOX joint 5 are provided with the inclined annular grooves 11M and 11F. After the PIN joint 3 has been completely inserted into the BOX joint 5, the ring member 13 is placed across the annular grooves 11M and 11F of both the PIN joint 3 and the BOX joint 5. As shown in FIG. As a result, not only the tensile load but also the torsional load between the joined steel pipes 7 can be transmitted by the ring member 13 without providing a separate member such as a bolt that resists rotation. In other words, since the joint is generally set to have a tensile strength equivalent to that of the steel pipe 7, in the present embodiment, it is possible to achieve a torsion equivalent to that of the steel pipe 7 without addition or addition of members. The torsional strength can be easily ensured.

Further, in the present embodiment, a method is adopted in which inclined annular grooves 11M and 11F are provided in the PIN joint 3 and the BOX joint 5, and the ring member 13 is arranged so as to straddle the annular grooves 11M and 11F. This method has the advantage that the ring member 13 itself serves as a rotation preventing mechanism. In this type of mechanical joint, it may be desirable to prevent its rotation after joining. For example, steel pipe sheet piles are not allowed to rotate because steel pipes are provided with mechanical joints for joining adjacent steel pipes.

For example, if the annular grooves provided in the PIN joint 3 and the BOX joint 5 are linear (flat), there is no element that hinders the circumferential movement of the ring member, so there is no resistance to rotation. Therefore, for example, it is necessary to separately provide a pin or the like for preventing rotation. In fact, the mechanical joints described in Patent Documents 3 and 4 require a mechanical element for preventing rotation, and partly employs a screwing method as a rotation preventing mechanism. In other screw joints, a rotation prevention pin is provided from the viewpoint of rotation and loosening prevention, and a method of inserting a loosening prevention bolt through a screw hole opened on the outside is adopted. The former requires a rectangular key slot and a matching key, while the latter requires a single bolt.

On the other hand, in the method of the present embodiment, the ring member 13 and the annular grooves 11M and 11F of the PIN joint 3 and the BOX joint 5 are inclined. As a result, the axial movement of the ring member 13 disappears as the ring member 13 rotates, so that the ring member 13 itself functions as a rotation preventing mechanism.

In the present embodiment, the PIN joint 3 is arranged above and the BOX joint 5 is arranged below, and the PIN joint 3 is inserted into the BOX joint 5 to join them together. It may be upside down. That is, the BOX joint 5 may be placed on top, the PIN joint 3 may be placed on the bottom, and the BOX joint 5 may be inserted into the PIN joint 3 to join them together.

<Other Aspect 1>
In the above description, before the PIN joint 3 is inserted, the ring member 13 is completely stored in the annular groove 11M of the PIN joint 3 so as not to protrude from the groove. However, since the ring member 13 is stored not horizontally but at an angle, it may be configured as follows. That is, the ring member 13 is stored in a state in which a part of the ring member 13 protrudes from the annular groove 11M, and the ring member 13 is reduced in diameter during the insertion process, and the annular grooves 11M and 11F of the PIN joint 3 and the BOX joint 5 are integrally closed. It may be configured such that the diameter expands when the space is formed.

FIG. 2 is an explanatory diagram of such an embodiment, and the same reference numerals are given to the same parts as those in FIG. 1 and the corresponding parts. In addition, the upper side of the drawing shows a longitudinal section, and the lower side of the drawing shows a horizontal section of the annular groove 11M portion of the PIN joint 3 (see arrow AA in FIG. 2(a)). 2(a) shows the state before insertion, FIGS. 2(b) and 2(c) show the state during insertion, and FIG. 2(d) shows the state of completion of insertion and fitting.

As shown in FIG. 2( a ), the ring member 13 is housed in the annular groove 11</b>M of the PIN joint 3 with a part of the ring member 13 protruding in the thickness direction. At this time, it is preferable to store the ring member 13 in the annular groove 11M so that the notch 15 is at the top, because the symmetry of the deformation of the ring member 13 in the radial direction can be secured. Further, it is preferable to restrict movement of the ring member 13 in a direction other than the radial direction, particularly in the circumferential direction, with a bolt 19 at the lowest portion (the portion that deforms first) of the ring member 13 . However, restraint of movement in the circumferential direction by the bolts 19 is not essential. In addition, in order to smoothen the deformation of the ring member 13 when inserting the PIN joint 3 into the BOX joint 5, a chamfered portion 25 inclined radially inward is formed on the entire circumference of the inner surface side of the distal end portion 10 of the BOX joint 5. It is preferable to keep

FIG. 2B shows a state in which a part of the PIN joint 3 is inserted into the BOX joint 5 and the lower end of the ring member 13 is arranged inside the BOX joint 5 . In this state, the ring member 13 is pushed to the right in the drawing as indicated by the arrow in the drawing, and the amount of protrusion of the upper end portion of the ring member 13 from the annular groove 11M increases. As the insertion progresses in this state, the portion of the ring member 13 that abuts against the inner surface of the BOX joint 5 increases, and the diameter of the ring member 13 gradually decreases from the lower end side. When the ring member 13 is inserted until the upper end of the ring member 13 reaches below the chamfered portion 25 of the BOX joint 5 as shown in FIG.

The reason why the diameter of the ring member 13 can be reduced is that the notch 15 is provided. . The reason why the diameter of the ring member 13 can be gradually reduced from the lower end side as described above is that the ring member 13 is stored in the annular groove 11M in an inclined state. In such a case, such smooth diameter reduction cannot be performed.

When the insertion is further advanced and the insertion is completed, as shown in FIG. 2(d), the annular grooves 11M and 11F of the PIN joint 3 and the BOX joint 5 face each other to form an annular groove 11 consisting of a closed space. do. Then, the ring member 13 is returned to the state shown in FIG. In this state, since the ring member 13 is arranged to straddle the annular grooves 11M and 11F of both the PIN joint 3 and the BOX joint 5, the tensile load due to the ring member 13 is reduced as in the state of FIG. Transmission of torsional loads becomes possible.

<Other aspect 2>
In the other aspect 1 described above, since the ring member 13 is not fixed, there is a possibility that trouble may occur when the PIN joint 3 is transported to a predetermined position. In order to prevent this, the ring member 13 may be fixed by a fixing member 41 as shown in FIG. 3, for example. The fixing member 41 is composed of, for example, a polypropylene band (PP band) or the like. In addition, it is desirable that the fixing member 41 is made of a material that is thin, can be easily fixed with fingers, and is resistant to water and oil. The fixing member 41 suppresses the diameter expansion of the ring member 13 by fixing (locking) the entire circumference of the ring member 13 .

In the joining method of the mechanical joint 1 using the fixing member 41, first, before the PIN joint 3 and the BOX joint 5 are fitted together, the ring member 13 is reduced in diameter and inserted into the annular groove 11M of the PIN joint 3. Store. Subsequently, while the ring member 13 is stored in the annular groove 11M, the entire circumference of the ring member 13 is covered with the fixing member 41, and the ring member 13 is pushed radially by the fixing member 41. , to fix the ring member 13 . Thereby, the ring member 13 is fixed while being pressed in the radial direction by the fixing member 41 .

Subsequently, the fixing member 41 is removed (cut) during fitting of the PIN joint 3 and the BOX joint 5, or the fixing member 41 is removed from the through hole 23 of the BOX joint 5 after the completion of the fitting. , the fixing of the ring member 13 is released. As a result, the diameter of the ring member 13 is expanded, and the ring member 13 is disposed within the annular groove 11 so as to straddle the annular groove 11M of the PIN joint 3 and the annular groove 11F of the BOX joint 5, thereby completing the joining. do.

There are two timings for removing the fixing member 41, during the fitting of the PIN joint 3 and the BOX joint 5, or after the completion of the fitting. “During fitting” means the timing when the fixing member 41 reaches the tip portion 10 of the BOX joint 5 . Thus, when the fixing member 41 reaches the tip portion 10 of the BOX joint 5, the ring member 13 contacts the inner peripheral surface of the BOX joint 5 even if the fixing member 41 is removed. I have nothing to do. Further, “after completion of fitting” means a state in which the tip portion 10 of the BOX joint 5 is in contact with the stepped portion 9 of the PIN joint 3 .

By using such a fixing member 41, the PIN joint 3 and the BOX joint 5 can be joined by an inexpensive means while suppressing the diameter expansion of the ring member 13. FIG. Further, by using the fixing member 41, the PIN joint 3 can be safely transported while the ring member 13 is stored in the annular groove 11M. The fixing of the ring member 13 by the fixing member 41 can be easily carried out. Therefore, from the viewpoint of preventing the ring member 13 from falling during transportation or work of the PIN joint 3, even if the ring member 13 is fixed by another means (for example, adhesive tape), it can be fixed from above. It is desirable to implement fixation by member 41 .

In addition, since the ring member 13 is configured with a thickness that can be bent by hand (for example, a thickness of about 12 to 16 mm), a plurality of cutouts 15 or a plurality of drilled holes are provided. As a result, there is a possibility that the performance of the spring structure and the accuracy of the shape will be degraded. On the other hand, in this embodiment, the fixing member 41 is used to reduce the diameter of the ring member 13 and store it in the annular groove 11M of the PIN joint 3. By expanding the diameter of the ring member 13 later, the PIN joint 3 and the BOX joint 5 are joined. As a result, the PIN joint 3 and the BOX joint 5 can be joined without deteriorating the performance of the ring member 13 as a spring structure and the accuracy of the shape.

<Other aspect 3>
In the first embodiment described above, it is necessary to provide a plurality of holes (drilled holes 18 and tapped holes 17) in the ring member 13 and the PIN joint 3, which increases processing costs. Therefore, the notch 15 of the ring member 13 may be fixed by a fixing member 42, as shown in FIG. 4, for example. This fixing member 42 is made of, for example, an adhesive tape. In addition, it is preferable that the fixing member 42 is made of a material that is thin, can be easily fixed with fingers, and is resistant to water and oil. The fixing member 42 is provided over the notch 15 formed in the circumferential direction of the ring member 13 to suppress the diameter expansion of the ring member 13 .

In the joining method of the mechanical joint 1 using the fixing member 42, first, before the PIN joint 3 and the BOX joint 5 are fitted together, the ring member 13 is reduced in diameter and inserted into the annular groove 11M of the PIN joint 3. Store. Subsequently, while the ring member 13 is stored in the annular groove 11M, a fixing member 42 is provided across the notch 15 of the ring member 13, and the fixing member 42 suppresses the diameter expansion of the ring member 13. By doing so, the ring member 13 is fixed.

Subsequently, the fixing member 42 is removed (cut) during fitting of the PIN joint 3 and the BOX joint 5, or the fixing member 42 is removed from the through hole 23 of the BOX joint 5 after the completion of the fitting. , the fixing of the ring member 13 is released. As a result, the diameter of the ring member 13 is expanded, and the ring member 13 is disposed within the annular groove 11 so as to straddle the annular groove 11M of the PIN joint 3 and the annular groove 11F of the BOX joint 5, thereby completing the joining. do.

There are two timings for removing the fixing member 42, during the fitting of the PIN joint 3 and the BOX joint 5, or after the completion of the fitting. “During fitting” means the timing when the fixing member 42 reaches the tip portion 10 of the BOX joint 5 . Thus, when the fixing member 42 reaches the distal end portion 10 of the BOX joint 5, the ring member 13 contacts the inner peripheral surface of the BOX joint 5 even if the fixing member 42 is removed. I have nothing to do. Further, “after completion of fitting” means a state in which the tip portion 10 of the BOX joint 5 is in contact with the stepped portion 9 of the PIN joint 3 .

By fixing the ring member 13 to the PIN joint 3 with the fixing member 42 so as to cover the notch 15 while the ring member 13 is stored in the PIN joint 3 in this way, the PIN joint 3 is fixed to the BOX joint 5 . The ring member 13 will not be caught when it is inserted into. For example, after the PIN joint 3 and the BOX joint 5 are completely fitted, the ring member 13 can be easily cut through the through hole 23 of the BOX joint 5 that is provided in advance at a position corresponding to the notch 15 (see FIG. 4). (b)). As a result, the ring member 13 is released from the restraint, and the joining of the PIN joint 3 and the BOX joint 5 is completed.

In this aspect, as in the above-described other aspect 2, the fixing member 42 is used to reduce the diameter of the ring member 13 and store it in the annular groove 11M of the PIN joint 3, during or after the fitting is completed. By expanding the diameter of the ring member 13, the PIN joint 3 and the BOX joint 5 are joined. As a result, the PIN joint 3 and the BOX joint 5 can be joined without deteriorating the performance of the ring member 13 as a spring structure and the accuracy of the shape.

In addition, you may use this aspect and the said other aspect 2 together. That is, the PIN joint 3 and the BOX joint 5 may be joined using a plurality of fixing members 41 and 42 . In this case, the notch 15 of the ring member 13 is first fixed by the fixing member (first fixing member) 42 before the PIN joint 3 and the BOX joint 5 are fitted together. Thereby, the ring member 13 is stored in the annular groove 11M of the PIN joint 3. As shown in FIG. Subsequently, the fixing member (second fixing member) 41 fixes the entire circumference of the ring member 13 including the fixing member 42 . In this manner, the ring member 13 is fixed by covering the entire circumference of the ring member 13 with the fixing member 41 and pressing the ring member 13 radially with the fixing member 41 . Subsequently, after transportation of the PIN joint 3 is completed, the fixing member 41 is removed (cut) either during or after the fitting of the PIN joint 3 and the BOX joint 5 is completed. By removing the fixing member 42 after removing the fixing member 41, the fixing of the ring member 13 is released. As a result, the diameter of the ring member 13 is expanded, and the ring member 13 is disposed within the annular groove 11 so as to straddle the annular groove 11M of the PIN joint 3 and the annular groove 11F of the BOX joint 5, thereby completing the joining. do.

Further, in this aspect, the ring member 13 was stored on the PIN joint 3 side (within the annular groove 11M) before the PIN joint 3 and the BOX joint 5 were fitted together. It is applicable even when it is stored on the side (within the annular groove 11F).

In this case, the PIN joint 3 and the BOX joint 5 can be joined, for example, as follows. First, before fitting the PIN joint 3 and the BOX joint 5 together, the notch 15 of the ring member 13 is fixed by the fixing member 42 . Thereby, the ring member 13 is stored in the annular groove 11F of the BOX joint 5. As shown in FIG. The ring member 13 housed in the BOX joint 5 is expanded in diameter from the state in which no external force is applied. That is, the ring member 13 is retracted to the groove bottom in the annular groove 11F of the BOX joint 5 by the fixing member 42 and stored in a state of being expanded in diameter.

Subsequently, the fixing member 42 is removed while the PIN joint 3 and the BOX joint 5 are being fitted. Subsequently, after the tip portion 10 of the BOX joint 5 is brought into contact with the stepped portion 9 of the PIN joint 3, a bolt is screwed through a screw hole formed in the BOX joint 5, for example. As a result, the ring member 13 is radially pressed by the bolt screw, and the ring member 13 is arranged so as to straddle both the annular groove 11M and the annular groove 11F, thereby completing the joining.

Moreover, the PIN joint 3 and the BOX joint 5 can be removed, for example, as follows. First, in a state where the PIN joint 3 and the BOX joint 5 are joined together, for example, the bolt threaded into the threaded hole of the BOX joint 5 is loosened. As a result, the radial pressing of the ring member 13 by the bolt screw is released, and the ring member 13 is stored in the annular groove 11</b>F of the BOX joint 5 . Subsequently, the PIN joint 3 and the BOX joint 5 are removed while the ring member 13 is stored in the annular groove 11F of the BOX joint 5 .

<Other Aspect 4>
In the above-mentioned other mode 3, the hole provided in the BOX joint 5 may be the through hole 23 as a joining operation, but considering the removal of the PIN joint 3, for example, as shown in FIG. 43 is preferred. By providing the screw hole 43 in the BOX joint 5 in this way, the ring member 13 can be put in a stored state on the side of the PIN joint 3 by screwing the bolt screw 44 from the outside of the screw hole 43. 3 can be extracted. That is, by screwing the bolt screw 44 into the threaded hole 43 of the BOX joint 5 , the ring member 13 can be radially pushed by the bolt screw 44 .

In the method of removing the mechanical joint 1 using the threaded hole 43 and the bolt screw 44, first, as shown in FIG. A bolt screw 44 is screwed into the hole 43 . As a result, as shown in FIGS. 5B and 5C, the ring member 13 is radially pressed by the bolt screw 44 until the ring member 13 is housed in the annular groove 11M of the PIN joint 3. The ring member 13 is stored in the annular groove 11M of the PIN joint 3. Subsequently, the PIN joint 3 and the BOX joint 5 are removed while the ring member 13 is stored in the annular groove 11M of the PIN joint 3 .

At this time, the notch 15 of the ring member 13 may be fixed with a fixing member 42 such as an adhesive tape through the through hole 23 of the BOX joint 5, as in the above-described other mode 3. As a result, even if the bolt screw 44 is removed, the ring member 13 can be kept in the annular groove 11M of the PIN joint 3, making it easier to remove the PIN joint 3 and the BOX joint 5. It can be carried out.

<Other aspect 5>
In the first embodiment described above, the joining is completed by expanding the diameter of the ring member 13 while the stepped portion 9 of the PIN joint 3 is in contact with the tip portion 10 of the BOX joint 5. A process for suppressing the diameter reduction of the ring member 13 may be performed. In this case, for example, as shown in FIG. 6 , confirmation holes 45 are provided in the BOX joint 5 at positions corresponding to the notches 15 formed in the ring member 13 in the circumferential direction. This confirmation hole 45 is provided through the BOX joint 5 .

In the annular groove 11M of the PIN joint 3, screw holes 46 are provided at positions corresponding to one end and the other end of the notch 15 of the ring member 13, respectively. This threaded hole 46 is formed in one end of the notch 15 of the ring member 13 arranged in both the annular grooves 11M and 11F so as to straddle the PIN joint 3 side and the BOX joint 5 side in the annular groove 11M of the PIN joint 3. and the other end, respectively. Note that "positions corresponding to the one end and the other end" mean the vicinity of the one end and the other end.

After joining the PIN joint 3 and the BOX joint 5 , by screwing the bolt screw 47 into each screw hole 46 , the diameter reduction of the ring member 13 is suppressed. 6, a slight gap is formed between each bolt screw 47 and one end and the other end of the notch 15, but each bolt screw 47 and one end and the other end of the notch 15 are formed with a slight gap. may be brought into contact with each other.

In this way, after the PIN joint 3 and the BOX joint 5 are joined, the bolt screw 47 is provided at the position of the notch 15 so that the ring member 13 fits into the annular groove 11M of the PIN joint 3 and the annular groove 11F of the BOX joint 5. It is possible to maintain the state in which they are arranged so as to straddle. That is, it is possible to prevent the ring member 13 from accidentally falling off after the PIN joint 3 and the BOX joint 5 are joined. Furthermore, after joining the PIN joint 3 and the BOX joint 5, the diameter of the ring member 13 is appropriately expanded in the annular groove 11 through the confirmation hole 45, that is, the PIN joint 3 and the BOX joint 5 are properly joined. You can check whether

In the other modes 1 to 5 described above, the PIN joint 3 is arranged above and the BOX joint 5 is arranged below, and the PIN joint 3 is inserted into the BOX joint 5 to connect them. Although they are joined together, this relationship may be upside down. That is, the BOX joint 5 may be placed on top, the PIN joint 3 may be placed on the bottom, and the BOX joint 5 may be inserted into the PIN joint 3 to join them together.

[Embodiment 2]
In the first embodiment, the ring member 13 is housed in the PIN joint 3 before the PIN joint 3 is inserted into the BOX joint 5. However, in the present embodiment, as shown in FIG. 13 is stored on the BOX joint 5 side. In FIG. 7, the same reference numerals are given to the same parts as in FIG. 1 and the corresponding parts. 7(b-1) and FIG. 7(b-2), and FIG. 7(c-1) and FIG. It is the same as b-2).

The difference of this embodiment from the first embodiment is that the ring member 13 is housed in the BOX joint 5, so the following description focuses on this point. The ring member 13 has the same configuration as that of the first embodiment, and when stored in the BOX joint 5, the ring member 13 expands in diameter more than when no external force is applied. That is, as shown in FIG. 7(b-2), the ring member 13 is pulled to the groove bottom in the annular groove 11F of the BOX joint 5 by the tap screw 27 and stored in a state where the diameter thereof is expanded.

Regarding the fitting operation of the mechanical joint 1 of the present embodiment, as shown in FIG. , the ring member 13 is contracted by its own spring force. As a result, as shown in FIG. 7C, the PIN joint 3 and the BOX joint 5 are arranged so as to straddle the annular grooves 11M and 11F. The mechanical joint 1 of this embodiment can also achieve the same effects as those of the first embodiment.

When the ring member 13 has a spring structure as in Embodiments 1 and 2, the ring member 13 and the annular grooves 11M and 11F are formed in the same position by arranging the notch 15 at the upper end or lower end of the oblique groove. Axial and symmetrical are desirable.

Also in this embodiment, the PIN joint 3 is arranged above and the BOX joint 5 is arranged below, and the PIN joint 3 is inserted into the BOX joint 5 to join them. may be upside down. That is, the BOX joint 5 may be placed on top, the PIN joint 3 may be placed on the bottom, and the BOX joint 5 may be inserted into the PIN joint 3 to join them together.

[Embodiment 3]
The ring member 13 of Embodiments 1 and 2 has an annular shape that extends almost all the way around. It may form a ring shape as a whole. This embodiment uses such a ring member 13. In this embodiment, as shown in FIGS. 8(b-2) and 8(c-2), the ring member 13 has four It is divided into four pieces 13P. 8(b-1) and FIG. 8(b-2), and FIG. 8(c-1) and FIG. 8(c-2) are shown in FIG. 1(b-1) is the same as FIG. 1(b-2).

When the ring member 13 is formed of a plurality of members, it no longer has a spring structure. Therefore, each split piece 13P is stored in the annular groove 11F before the PIN joint 3 is inserted, and after the insertion is completed, each split piece 13P is moved so as to straddle the annular grooves 11M and 11F of the PIN joint 3 and the BOX joint 5. must be fixed.

In this embodiment, as shown in FIG. 8(b), the BOX joint 5 is provided with a through tapped hole 29, and each split piece 13P is provided with a threaded hole 31 having a smaller diameter than the through tapped hole 29. there is Then, while the split piece 13P is stored in the annular groove 11F of the BOX joint 5, a bolt screw 33 having a smaller diameter than the through tap hole 29 is inserted into the through tap hole 29 and screwed into the threaded hole 31 of the split piece 13P. , the split piece 13P is held by the BOX joint 5. As shown in FIG.

After the PIN joint 3 has been completely inserted into the BOX joint 5, the bolt screw 33 is removed, and then a set screw 34 that fits the through tap hole 29 is inserted. As a result, each split piece 13P is pushed in, and each split piece 13P is positioned across the annular grooves 11M and 11F of both the PIN joint 3 and the BOX joint 5, completing the fitting. The threaded hole 31 provided in the split piece 13P has a smaller diameter than the set screw 34, and the set screw 34 does not penetrate into the threaded hole 31. It is desirable that the set screw 34 is prevented from coming off due to vibration or the like, for example, a detachment prevention means such as an adhesive.

The mechanical joint 1 of this embodiment can also achieve the same effects as those of the first embodiment. In the above example, the split piece 13P is stored in the annular groove 11F of the BOX joint 5 before the PIN joint 3 is inserted. The split piece 13P may be held in the annular groove 11M of the PIN joint 3 in the state of .

In Embodiments 1 to 3, the annular groove 11 is formed in one stage, but the present invention is not limited to this, and the number of stages of the annular groove 11 is plural in the central axis direction of the joint. good too. By using multiple stages, a larger load can be transmitted.

Also in this embodiment, the PIN joint 3 is arranged above and the BOX joint 5 is arranged below, and the PIN joint 3 is inserted into the BOX joint 5 to join them. may be upside down. That is, the BOX joint 5 may be placed on top, the PIN joint 3 may be placed on the bottom, and the BOX joint 5 may be inserted into the PIN joint 3 to join them together.

[Embodiment 4]
In Embodiment 1, the annular grooves 11M and 11F are formed in the PIN joint 3 and the BOX joint 5, and the ring member 13 is stored in the annular grooves 11M and 11F. As shown in FIG. 9, spiral grooves 35M and 35F are formed instead of the annular grooves 11M and 11F, and the spiral groove 35 formed of a closed space formed by integrating the spiral grooves 35M and 35F is provided with a spiral member made of a spring material. 37 is stored. In FIG. 9, the same reference numerals are given to the same parts as those in FIG. 1 and to the corresponding parts.

Although FIG. 9 does not show a means for holding the spiral member 37 in the state of being stored in the spiral groove 35, it can be constructed in the same manner as in the first embodiment. Further, the configuration may be the same as that of another aspect 1 of the first embodiment. That is, the helical member 37 is stored in the helical groove 35 of the PIN joint 3 in a state where a part of the helical member 37 protrudes from the helical groove 35 , and the diameter of the helical member 37 is reduced during the insertion process, so that the PIN joint 3 and the BOX joint 5 are connected to the helical groove 35 . The grooves 35 may be configured to expand in diameter when forming a closed space together.

The operation of inserting the PIN joint 3 is also the same as in the first embodiment, and is outlined below with reference to FIG. After the helical member 37 is stored in the helical groove 35M of the PIN joint 3 (see FIG. 9A), the PIN joint 3 is inserted into the BOX joint 5, and the insertion is completed (see FIG. 9B). , spiral grooves 35M and 35F are integrated to form a spiral groove 35 which is a closed space. Then, the diameter of the spiral member 37 is expanded in the spiral groove 35 so as to straddle the spiral grooves 35M and 35F of both the PIN joint 3 and the BOX joint 5. As shown in FIG.

Also in this embodiment, the same effect as in the first embodiment can be obtained. In the example of FIG. 9, the spiral member 37 is stored in the spiral groove 35M of the PIN joint 3 before being inserted. It may be stored and inserted in the spiral groove 35F. Also, the number of turns of the spiral may be one or more.

Also in this embodiment, the PIN joint 3 is arranged above and the BOX joint 5 is arranged below, and the PIN joint 3 is inserted into the BOX joint 5 to join them. may be upside down. That is, the BOX joint 5 may be placed on top, the PIN joint 3 may be placed on the bottom, and the BOX joint 5 may be inserted into the PIN joint 3 to join them together.

The above description was about the mechanical joint 1 fixed to the end of the steel pipe 7 by welding or the like, but by attaching such a mechanical joint 1 to one or the other end of the steel pipe 7, A weldable steel pipe 7 can be constructed. Further, by connecting the steel pipes 7 to which the mechanical joints 1 are attached, a structure joined by the mechanical joints 1 can be configured. Furthermore, in order to construct such a structure, the position of one of the steel pipes 7 with joints to be connected is constrained in the axial direction of the steel pipe, and the other steel pipe 7 with joints is positioned on one of the steel pipes 7 with joints. It suffices to insert and fit them together.

In addition, although the first to third embodiments relate to the mechanical joint 1 as an invention of a product, it can be reconfigured as an invention of a design method or an invention of a manufacturing method. become.
<Invention of Design Method>
A design method for a mechanical joint that includes a tubular PIN joint and a BOX joint that is joined to the PIN joint, and that is attached to an end of a steel pipe to join the steel pipes,
A stepped portion is set on the base end side of the PIN joint,
setting the front end portion of the BOX joint in contact with the stepped portion in a state in which the PIN joint and the BOX joint are completely fitted, and
one or more annular grooves inclined with respect to the pipe axis direction are arranged so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state,
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the fitted state. A method of designing a mechanical joint in which a ring member is set so that it can be arranged so as to straddle the side.

<Invention of manufacturing method>
A method for manufacturing a mechanical joint that includes a tubular PIN joint and a BOX joint that is joined to the PIN joint, and is attached to an end of a steel pipe to join steel pipes together,
A stepped portion is formed on the base end side of the PIN joint,
forming a front end portion of the BOX joint in contact with the stepped portion in a mating state in which the PIN joint and the BOX joint are completely fitted;
One or more annular grooves inclined at a constant angle with respect to the pipe axis direction are formed so as to face the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state, respectively;
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the fitted state. A method of manufacturing a mechanical joint that forms a ring member so that it can be arranged to straddle the side.

Further, when the invention of the mechanical joint of Embodiment 4 is reconfigured into the invention of the design method and the invention of the manufacturing method, the invention will be as follows.
<Invention of Design Method>
A design method for a mechanical joint that includes a tubular PIN joint and a BOX joint that is joined to the PIN joint, and that is attached to an end of a steel pipe to join the steel pipes,
A stepped portion is set on the base end side of the PIN joint,
setting the front end portion of the BOX joint in contact with the stepped portion in a state in which the PIN joint and the BOX joint are completely fitted, and
A spiral groove having a spiral shape of one or more turns is arranged so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state,
The PIN joint side and the BOX joint can be stored in the spiral groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and in the fitted state, the PIN joint side and the BOX joint can be stored in the spiral groove. A method for designing a mechanical joint in which a helical member is set so that it can be arranged so as to straddle the side.

<Invention of manufacturing method>
A method for manufacturing a mechanical joint that includes a tubular PIN joint and a BOX joint that is joined to the PIN joint, and is attached to an end of a steel pipe to join steel pipes together,
A stepped portion is formed on the base end side of the PIN joint,
forming a front end portion of the BOX joint in contact with the stepped portion in a mating state in which the PIN joint and the BOX joint are completely fitted;
A spiral groove having a spiral shape of one turn or more is formed so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state,
The PIN joint side and the BOX joint can be stored in the spiral groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and in the fitted state, the PIN joint side and the BOX joint can be stored in the spiral groove. A method for manufacturing a mechanical joint that forms a helical member so that it can be arranged so as to straddle the side.

The present invention is capable of transmitting large torsional loads without increasing cost. Joints are generally machined by cutting, but it is not difficult to cut oblique or spiral grooves. This invention can be implemented in the same manner as circular processing, and has high industrial applicability.

REFERENCE SIGNS LIST 1 mechanical joint 3 PIN joint 5 BOX joint 7 steel pipe 9 stepped portion 10 tip portion 11 annular groove 11M annular groove (PIN joint)
11F Annular groove (BOX joint)
13 Ring Member 13P (Ring Member) Split Piece 15 Notch 17 Tap Hole 18 Drilled Hole 19 Bolt 21 Recess 23 Through Hole 25 Chamfer 27 Tap Screw 29 Through Tap Hole 31 Screw Hole 33 Bolt Screw 34 Set Screw 35 Spiral Groove 35M Spiral Groove (PIN joint)
35F Spiral groove (BOX joint)
37 helical member 41 fixing member 42 fixing member 43 screw hole 44 bolt screw 45 confirmation hole 46 screw hole 47 bolt screw

Claims (17)

A mechanical joint comprising a tubular PIN joint and a BOX joint joined to the PIN joint, and attached to an end of a steel pipe to join the steel pipes together,
A stepped portion is formed on the base end side of the PIN joint, and when the PIN joint and the BOX joint are fitted together, the tip portion of the BOX joint comes into contact with the stepped portion to complete the fitting state. configured to
an annular groove having one or more steps, which is formed so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state, and which is inclined with respect to the pipe axial direction;
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the mated state. and a ring member that can be arranged to straddle the joint side. 2. A mechanical joint according to claim 1, wherein one or more notches are provided in said ring member. a confirmation hole provided through the annular groove of the BOX joint at a position corresponding to the notch of the ring member;
In the annular groove of the PIN joint, at positions corresponding to one end and the other end of the notches of the ring member arranged in both annular grooves so as to straddle the PIN joint side and the BOX joint side, respectively. a threaded hole;
A mechanical joint according to claim 1, comprising: a threaded hole into which a screw is screwed in the BOX joint so that the ring member can be pushed radially by the screw;
A mechanical joint according to claim 1, comprising: A steel pipe having the PIN joint or BOX joint of the mechanical joint according to any one of claims 1 to 4 attached to one end and/or the other end. A structure comprising a plurality of steel pipes connected by a mechanical joint according to any one of claims 1-4 . 7. The method for constructing a structure according to claim 6 , wherein the axial position of one of the steel pipes with joints to be connected is restrained, and the other steel pipe with joints is positioned on the one steel pipe with joints. A construction method for a structure that is mated and inserted. A mechanical joint fixing method for fixing a ring member to the PIN joint of the mechanical joint according to any one of claims 2 to 4 with a fixing member,
storing the ring member in the annular groove of the PIN joint with its diameter reduced;
In the stored state, the ring member is fixed by covering the entire circumference of the ring member with the fixing member and pushing the ring member in the radial direction with the fixing member.
How to fix mechanical joints. A mechanical joint fixing method for fixing a ring member to the PIN joint or BOX joint of the mechanical joint according to any one of claims 2 to 4 with a fixing member,
storing the ring member in a reduced diameter state in the annular groove of the PIN joint, or storing the ring member in an expanded state in the annular groove of the BOX joint;
The ring member is fixed by providing the fixing member across the notch of the ring member while it is stored, and suppressing the expansion or contraction of the diameter of the ring member with the fixing member.
How to fix mechanical joints. A mechanical joint fixing method for fixing a ring member to the PIN joint of the mechanical joint according to any one of claims 2 to 4 with a plurality of fixing members,
storing the ring member in the annular groove of the PIN joint in a reduced diameter state;
A first fixing member is provided across the notch of the ring member in the stored state, and the first fixing member suppresses expansion of the diameter of the ring member,
In the stored state, the ring member is fixed by covering the entire circumference of the ring member with a second fixing member and pushing the ring member in the radial direction with the second fixing member;
How to fix mechanical joints. A mechanical joint joining method for joining the mechanical joint according to any one of claims 2 to 4,
Using the mechanical joint fixing method according to claim 8 , the ring member is fixed in advance to the PIN joint or the BOX joint with a fixing member,
removing the fixing member during or after fitting the PIN joint and the BOX joint;
A method of joining mechanical joints. A mechanical joint joining method for joining the mechanical joint according to claim 3,
After fitting the PIN joint and the BOX joint, a screw is screwed into each screw hole of the PIN joint,
suppressing diameter reduction of the ring member by the threaded screw;
A method of joining mechanical joints. A method for removing a mechanical joint for removing the mechanical joint according to claim 4,
With the PIN joint and the BOX joint completed, screw the screw into the threaded hole of the BOX joint,
pushing the ring member radially with the screw until the ring member is retracted within the annular groove of the PIN joint;
removing the PIN joint and the BOX joint with the ring member stored in the annular groove of the PIN joint;
How to remove mechanical joints. A design method for a mechanical joint that includes a tubular PIN joint and a BOX joint that is joined to the PIN joint, and that is attached to an end of a steel pipe to join the steel pipes,
A stepped portion is set on the base end side of the PIN joint,
setting the front end portion of the BOX joint in contact with the stepped portion in a state in which the PIN joint and the BOX joint are completely fitted, and
one or more annular grooves inclined with respect to the pipe axis direction are arranged so as to face each of the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state,
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the fitted state. A method of designing a mechanical joint in which a ring member is set so that it can be arranged so as to straddle the side. A method for manufacturing a mechanical joint that includes a tubular PIN joint and a BOX joint that is joined to the PIN joint, and is attached to an end of a steel pipe to join steel pipes together,
A stepped portion is formed on the base end side of the PIN joint,
forming a front end portion of the BOX joint in contact with the stepped portion in a mating state in which the PIN joint and the BOX joint are completely fitted;
One or more annular grooves inclined at a constant angle with respect to the pipe axis direction are formed so as to face the outer peripheral surface of the PIN joint and the inner peripheral surface of the BOX joint in the fitted state, respectively;
The PIN joint side and the BOX joint can be stored in the annular groove of the PIN joint or the BOX joint so as not to interfere with the fitting of the PIN joint and the BOX joint, and the PIN joint side and the BOX joint can be stored in the annular groove in the fitted state. A method of manufacturing a mechanical joint that forms a ring member so that it can be arranged to straddle the side. A mechanical joint joining method for joining the mechanical joint according to any one of claims 2 to 4,
Using the mechanical joint fixing method according to claim 9 , the ring member is fixed in advance to the PIN joint or the BOX joint with a fixing member,
removing the fixing member during or after fitting the PIN joint and the BOX joint;
A method of joining mechanical joints. A mechanical joint joining method for joining the mechanical joint according to any one of claims 2 to 4,
Using the mechanical joint fixing method according to claim 10 , the ring member is fixed in advance to the PIN joint or the BOX joint with a fixing member,
removing the fixing member during or after fitting the PIN joint and the BOX joint;
A method of joining mechanical joints.

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