JP2009150073A - Joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a construction period by improving the work efficiency of the joining work of two members. <P>SOLUTION: The two members 1 and 2 are joined to each other by the engagement between a male joint 3 and a female joint 5. The male joint 3 has a male joint body 7 in which a base end side of a top part 9 provided for a tip side is provided with an engaging recession part 11. The female joint 5 comprises a housing 21 having an insertion hole 35 in which a joint bar 7 can be inserted; spheres 23 housed in a housing part 37 recessed to the outside from an inner circumferential surface 35a of the insertion hole 35 in a radial direction and movable in a radial direction of the insertion hole 35; and a sphere-biasing means 27 for biasing the spheres 23 in such a way to protrude the spheres 23 more inside in radial directions than the inner circumferential surface 35a. When the joint bar 7 is inserted in the insertion hole 35, the spheres 23 are biased toward the engaging recession part 11 by a biasing force of the sphere-biasing means 27 and arranged over the housing part 37 and the engaging recession part 11 to engage the housing part 37 and the engaging recession part 11 to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joint structure for joining members such as segments that construct a tunnel or the like.

Conventionally, as a joint structure for joining segments constructing a tunnel or the like, for example, there are those described in Patent Documents 1 to 3 below. In the joint structure described in Patent Document 1, as a female joint provided on the joint surface of the segment, a clip-shaped female portion having a distal end portion opened in an openable and closable manner is provided in a holding member having a substantially U-shaped cross section. In the opening of the female portion, a spacer having a gap is fitted so that the male portion of the male joint can be easily received.
At the time of fastening the joint, the male part having an enlarged head is inserted into the opening of the female part to push out the spacer and fit into the female part, and the enlarged head of the male part is fastened at the opening. It is trying to fix with.
Further, in the joint structure disclosed in Patent Document 2, a rectangular tubular locking member provided in the housing of the female member has a groove for engaging and holding the joining rod of the male member on the inside, and the locking member Is divided into 2 to 4 pieces. These divided locking members are urged in a direction in which they are joined and reduced in diameter by a leaf spring provided between them. Then, when joining the segments, when the enlarged head of the joining rod is pushed into the groove of the female member, the locking member is pushed outward against the urging force of the leaf spring to allow the joining rod to enter. Thereafter, the plurality of locking members are reduced in diameter by the urging force of the leaf springs to lock the joining rods. As a result, the male member and the female member are joined.

In the joint structure described in Patent Document 3, the joint rod of the male joint fitting has a tip tapered portion and a constricted portion. The female joint fitting has a holding space whose diameter is expanded on the joint surface side of the cylindrical housing, and a pair of substantially crescent-shaped locking members are arranged in the holding space so as to face each other. The locking members are biased in the direction of joining to each other by the plate spring.
Then, by inserting the joining rod of the male joint fitting into the holding space of the female joint fitting, the locking member is expanded in diameter against the urging force of the leaf spring, and when the tip tapered portion passes, the locking member is The female joint fitting and the male joint fitting are joined by reducing the diameter by the urging force of the leaf spring and engaging with the constricted portion.
Japanese Patent No. 3351767 JP-A-9-88490 JP 2001-90485 A

  However, in the above conventional joint structure, when the male part (joining rod) is inserted into the female part (locking member), sliding friction occurs between the male part and the female part, and Since resistance increases, there exists a problem that the work efficiency of the joining operation of a member falls, for example, there exists a possibility that shortening of the construction period of a tunnel cannot fully be achieved.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a joint structure capable of improving work efficiency of joining work and shortening the work period.

  In order to achieve the above object by solving the above-described problem, a joint structure according to the present invention engages a male joint and a female joint to form a first member having the male joint and the female. A joint structure for joining a second member having a mold joint to each other, wherein the male joint protrudes from the joint surface of the first member and is provided on the base end side of the head portion provided on the distal end side, with its outer peripheral surface A male joint body provided with an engagement recess recessed inward in the radial direction thereof, and the female joint includes a housing having an insertion hole that is fixed to the second member and into which the male joint body can be inserted. A sphere accommodated in an accommodating portion that is recessed radially outward from the inner peripheral surface of the insertion hole, and the sphere protrudes radially inward from the inner peripheral surface. Sphere urging means for urging so that the male joint body is inserted into the insertion hole. When the, while being biased toward the engagement concave portion by the urging force of the sphere the spherical biasing means, characterized in that it is arranged across the receiving portion and the engaging recess.

In the joint structure having this configuration, when the male joint body is inserted into the insertion hole, the sphere may be pressed against the outer peripheral surface of the head of the male joint body by the urging force of the sphere urging means. When the male joint body is further advanced in the insertion direction in this state, the sphere is pressed radially outward against the urging force of the sphere urging means by the head of the male joint body. Thereafter, when the sphere climbs over the outer peripheral surface of the head, the sphere is disposed across the accommodating portion and the engaging recess, and thus the male joint body and the housing are engaged by the sphere, whereby the first The member and the second member are joined together.
Here, since the sphere rolls on the outer peripheral surface of the head of the male joint body during the above-described insertion, only rolling friction is generated between the sphere and the outer peripheral surface of the head. Therefore, in this joint structure, the male joint body can be engaged with the housing at the time of insertion with a smaller resistance compared to conventional sliding friction.

  Further, in the joint structure, a regulating member for regulating the urging of the sphere inward in the radial direction by the sphere urging means in a state before insertion of the male joint main body and holding the sphere in the accommodating portion. In this case, when the male joint main body is inserted into the insertion hole, the male joint main body is released from restricting movement of the sphere radially inward by the restricting means. That's fine.

  By providing this restricting member, it is possible to reliably prevent the sphere from coming out of the housing portion before inserting the male joint body. Further, when the male joint body is inserted into the insertion hole, the sphere can be easily and reliably pressed against the outer surface of the head or the engaging recess.

  Furthermore, in the joint structure, the storage portion may be formed in the circumferential direction of the inner peripheral surface, and a plurality of the spheres may be arranged in the circumferential direction.

  In this case, since the plurality of spheres can be pressed over the entire circumferential direction of the head of the male joint body and the engaging recess by the urging force of the sphere urging means, for example, when inserting the male joint body Even if the axis of the insertion hole and the axis of the male joint body are misaligned with each other, this error is absorbed, i.e., the male joint body axis is substantially coincident with the insertion hole axis. The joint body can be guided into the insertion hole. Therefore, the male joint body can be easily inserted.

  Further, in the joint structure, the accommodating portion is formed to be continuous with the inner peripheral surface along the axis of the insertion hole, and gradually increases in diameter from the inner peripheral surface along the axis. An annular plate portion is provided in the housing, the annular plate portion being disposed to face the tapered inner peripheral surface through the sphere, and having an insertion hole through which the male joint body can be inserted. However, the spherical body biasing means may be biased toward the tapered inner peripheral surface along the axis.

  In the case of this configuration, the spheres are urged radially inward by pressing the plurality of spheres against the tapered inner peripheral surface by the annular plate portion. And even if a plurality of spheres are arranged on the taper inner peripheral surface, a plurality of spheres can be pressed by one annular plate portion, so that the number of elastic bodies constituting the sphere urging means is reduced. The urging means can be configured simply.

  Furthermore, in the joint structure, a guide groove portion that extends in a radial direction of the annular plate portion and accommodates a part of each sphere is formed on one end surface of the annular plate portion that contacts the sphere. May be.

The guide groove portion allows movement of each spherical body in the radial direction of the housing and the annular plate portion, but can restrict movement of each spherical body in the circumferential direction of the housing and the annular plate portion. Therefore, by forming the plurality of guide groove portions evenly in the circumferential direction on one end surface of the annular plate portion, the plurality of spheres can be evenly arranged in the circumferential direction.
From the above, the spherical body biasing means can evenly press the outer peripheral surface of the engagement concave portion of the male joint main body over the circumferential direction via the annular plate portion and the plurality of spherical bodies. As a structure, a stable tensile load can be obtained.

  According to the present invention, since the male joint body can be inserted into the housing with a smaller resistance than before and can be engaged with each other, it is possible to improve the work efficiency of the joining work of the members. The construction period can be shortened.

The first embodiment of the joint structure according to the present invention will be described below with reference to FIGS. In addition, the joint structure demonstrated here is used, for example as an inter-ring joint for joining segment rings to the axial direction of a tunnel.
As shown in FIG. 1, in the joint structure in the present embodiment, a male joint 3 is provided in the first segment (first member) 1, and a female girder is provided in the main girder plate 15 of the second segment (second member) 2. A joint 5 is provided.

The male joint 3 is formed with a male threaded portion 8 for fixing to the first segment 1 on the rear end side of a substantially cylindrical joining rod (male joint body) 7 protruding from the joint surface 1a of the first segment 1. Configured. The joining rod 7 is formed in a substantially rod shape by sequentially forming a head portion 9, an engaging recess 11 and a base portion 13 from the distal end side.
The head portion 9 of the joining rod 7 has a tapered portion 9a having a tapered diameter that gradually increases in size from the front end side toward the rear end side, and a cylinder having a constant diameter size connected to the rear end side of the tapered portion 9a. Part 9b. Here, the base 13 of the joining rod 7 has the same diameter as the cylindrical portion 9b.

And the engagement recessed part 11 is formed between these cylindrical part 9b and the base 13 along the axis O1 of the joining rod 7, From the outer peripheral surface of the cylindrical part 9b and the base 13 over the circumferential direction of the joining rod 7 It is a depression formed.
Note that the rear end surface 9c of the columnar portion 9b connected to the engagement recess 11 is formed in a curved shape that is smoothly recessed from the outer peripheral surface side of the columnar portion 9b toward the engagement recess 11. Further, the distal end surface 13 c of the base portion 13 connected to the engagement recess 11 is formed in a tapered surface shape toward the engagement recess 11.

Meanwhile, as shown in FIGS. 1 to 3, the female joint 5 is fixed to the back surface side of the main beam plate 15 of the second segment 2, and includes a housing 21, a plurality of spherical bodies 23, 23,. An annular plate portion 25, a sphere coil spring (sphere urging means) 27, and a cap (regulating member) 29 are provided.
The housing 21 includes a cylindrical body 31 and a lid 33 fixed to the back side of the main girder plate 15. The lid 33 includes the cylindrical body 31 and the above-described plurality of spheres 23, 23,. .... It is formed in a cup shape that covers the annular plate portion 25, the coil spring 27 for the sphere, and the cap 29, and its open end is fixed to the back surface side of the main beam plate 15.

  The cylindrical body 31 has an insertion hole 35 having a circular cross section through which the joining rod 7 can be inserted in the longitudinal direction, and the insertion hole 35 extends radially from the inner peripheral surface 35a over the circumferential direction. An accommodating portion 37 that is recessed outward is formed. The accommodating portion 37 includes a tapered inner peripheral surface 37a that gradually expands from the inner peripheral surface 35a along the axis O2 of the insertion hole 35 toward the distal end side in the insertion direction of the joining rod 7, and a tapered inner peripheral surface 37a. And a large-diameter inner peripheral surface 37b that is formed continuously in the direction away from the main beam plate 15 along the axis O2 of the insertion hole 35 and has a constant diameter. In this embodiment, the accommodating portion 37 opens in a direction away from the main beam plate 15 along the axis O2.

The plurality of spheres 23 are accommodated in an accommodating portion 37 formed in an annular shape in the circumferential direction, and are arranged in the circumferential direction. Further, the annular plate portion 25 formed in the shape of an annular plate is disposed so as to face the tapered inner peripheral surface 37 a via these spheres 23, and has an insertion hole 25 a through which the joining rod 7 can be inserted. . The annular plate portion 25 has an outer dimension set smaller than an inner diameter dimension of the large-diameter inner peripheral surface 37 b and is disposed in the accommodating portion 37.
Furthermore, the same number of slits (guide grooves) 25c extending from the inner periphery to the outer side in the radial direction are formed on one end face 25b of the annular plate portion 25, which is in contact with the sphere 23. The ring plate portion 25 penetrates in the thickness direction. The plurality of slits 25 c are arranged at equal intervals along the circumferential direction of the annular plate portion 25. Since the width dimension of each slit 25c formed in this way is smaller than the diameter dimension of the sphere 23, a part of each sphere 23 can be accommodated in each slit 25c. In this accommodated state, the sphere 23 The movement in the circumferential direction is restricted, and the movement in the radial direction becomes possible.

The annular plate portion 25 formed as described above is biased to the tapered inner peripheral surface 37a along the axis O2 by the spherical coil spring 27. That is, the spherical coil spring 27 is disposed between the annular plate portion 25 and the top plate portion 33a of the lid 33 disposed opposite thereto, and the spherical coil spring 27 is compressed in the direction of the axis O2. By arranging in this state, the annular plate portion 25 can be biased toward the tapered inner peripheral surface 37a.
Thus, the spherical body 23 sandwiched between the annular plate portion 25 and the tapered inner peripheral surface 37a is restricted from moving in the circumferential direction by the slit 25c of the annular plate portion 25, and the spherical coil spring 27 is It is urged radially inward along the slit 25c by the urging force.

The cap 29 is formed in a substantially cylindrical shape, and is disposed on the radially inner side of the plurality of spheres 23 in a state before the joining rod 7 is inserted. The cap 29 is formed such that its outer diameter is smaller than the inner diameter of the insertion hole 35 and the insertion hole 25a so that it can pass through the insertion hole 35 of the cylindrical body 31 and the insertion hole 25a of the annular plate portion 25. Has been. Further, the outer peripheral surface 29 a of the cap 29 is formed in a concave shape corresponding to the shape of the sphere 23 so as to come into surface contact with a part of the surface of the sphere 23 protruding radially inward from the inner peripheral surface of the insertion hole 35. Has been. That is, the cap 29 has a role of holding the sphere 23 in the housing portion 37 by restricting the sphere 23 to be urged radially inward by the sphere coil spring 27 before the joining rod 7 is inserted. Plays.
The main girder plate 15 to which the female joint 5 configured as described above is fixed has a hole portion 15a that penetrates in the thickness direction and communicates with the insertion hole 35 of the housing 21 outward. Yes. Further, support plates 41 and 41 are fixed to the main girder plate 15 at the vertical position of the female joint 5, and anchor members 42 and 42 are fixed to the support plates 41 and 41 by welding or the like. .

In the joint structure configured as described above, when two segments 1 and 2 are joined, the two segments 1 and 2 are opposed to each other and the male joint 5 is male as shown in FIG. The joint rod 7 of the male joint 3 may be inserted into the insertion hole 35 of the female joint 5 from the hole 15a of the main beam plate 15 of the second segment while holding the joint 3 substantially coaxially.
At the time of this insertion, the tip end side of the tapered portion 9 a of the joining rod 7 is inserted inside the cap 29 holding the plurality of spheres 23, and the midway portion of the tapered portion 9 a abuts on the cap 29. Thereafter, the joining rod 7 is further pushed in the insertion direction, so that the cap 29 passes through the insertion hole 25a of the annular plate portion 25 together with the tapered portion 9a of the joining rod 7, as shown in FIG. That is, the restriction of the movement of the spherical body 23 in the radial direction by the cap 29 is released.
The plurality of spheres 23 move from the outer peripheral surface of the cap 29 to the outer peripheral surface of the tapered portion 9a of the joining rod 7, and further move to the outer peripheral surface of the cylindrical portion 9b. Here, each sphere 23 is pressed radially outward against the urging force of the sphere coil spring 27 by the head 9 of the joining rod 7, and accordingly, the annular plate portion 25 is also along the direction of the axis O 2. It moves in the insertion direction of the joining rod 7.

When the joining rod 7 is further pushed in the insertion direction and the spheres 23 get over the outer peripheral surface of the cylindrical portion 9b, the spheres 23 are radially inward by the urging force of the sphere coil springs 27 as shown in FIG. It is energized and enters the engaging recess 11 of the joining rod 7. In this state, since the spherical body 23 is disposed across the accommodating portion 37 of the cylindrical body 31 and the engaging recess 11 of the joining rod 7, the joining rod 7 and the tubular body 31 are engaged by this spherical body 23. Thereby, the two segments 1 and 2 are joined to each other.
In addition, since the sphere 23 rolls on the outer peripheral surface of the head 9 of the joining rod 7 during the above-described insertion, only rolling friction occurs between the sphere 23 and the outer peripheral surface of the head 9. Further, at the time of this insertion, each spherical body 23 is also inserted into the slit 25 c (see FIG. 3) of the annular plate portion 25, so that it does not move in the circumferential direction of the cylindrical body 31.

As described above, according to the joint structure according to the present embodiment, when the joining rod 7 is inserted, only rolling friction is generated between the sphere 23 and the head 9 of the joining rod 7, so that the conventional sliding friction is performed. The joining rod 7 can be engaged with the housing 21 with a smaller resistance than the above. Therefore, it becomes possible to improve the working efficiency of the joining work of the segments 1 and 2, and in particular, it is possible to shorten the construction period of the tunnel.
Further, by arranging a plurality of the spheres 23 in the circumferential direction of the insertion hole 35, it is possible to press over the entire circumferential direction of the head 9 of the joining rod 7 and the engaging recess 11. Therefore, for example, when the joining rod 7 is inserted, even if the axis O2 of the insertion hole 35 and the axis O1 of the joining rod 7 are displaced from each other, this error is absorbed, that is, The joining rod 7 can be guided into the insertion hole 35 so that the axis O1 substantially coincides with the axis O2 of the insertion hole 35. Therefore, the joining rod 7 can be easily inserted.

Further, by providing the female joint 5 with the annular plate portion 25 and forming the tapered inner peripheral surface 37a on the cylindrical body 31, the plurality of spheres 23 are attached to the radially inner side with only one sphere coil spring 27. It will be possible to That is, the female joint 5 can be configured simply.
Further, by forming the plurality of slits 25 c in the annular plate portion 25, the plurality of spheres 23 can be evenly arranged and held over the circumferential direction of the insertion hole 35. Therefore, the coil spring 27 for a sphere can press the outer peripheral surface of the engagement recess 11 of the joining rod 7 evenly in the circumferential direction via the annular plate portion 25 and the plurality of spheres 23, and as a result, the joint As a structure, a stable tensile load can be obtained.
Furthermore, by providing the female joint 5 with the cap 29, the spherical body 23 can be reliably prevented from coming out of the accommodating portion 37 of the cylindrical body 31 before the joining rod 7 is inserted.

Next, other embodiments of the present invention will be described, but the same or similar members and parts as those of the above-described first embodiment will be described using the same reference numerals.
FIG. 6 shows the joint structure according to the second embodiment of the present invention. The male joint 3 is the same as that of the first embodiment, and the annular plate portion of the female joint 5 and the coil spring for the sphere are shown. Only the difference is described.
As shown in FIG. 6, the annular plate portion 51 in this embodiment includes an annular plate portion 52 having an insertion hole 52 a in the same manner as the annular plate portion 25 of the first embodiment, and a cylindrical body from its outer periphery. A cylindrical portion 53 extending in the insertion direction of the joining rod 7 to the outside of 31 and a flange portion 54 protruding in the radial direction from the tip to the outside of the cylindrical body 31 are integrally formed. The annular plate portion 52 is formed with a slit similar to the annular plate portion 25 of the first embodiment.

Further, the spherical coil spring (spherical biasing means) 55 is provided between the flange portion 54 of the annular plate portion 51 and the main girder plate 15, and in the state of the illustrated example, the annular plate portion 51 is provided. The both ends are fixed to the flange portion 54 and the main girder plate 15 so as to urge the main girder plate 15 toward the main girder plate 15 side.
The joint structure having this configuration also has the same effect as that of the first embodiment. Further, in the case of this joint structure, since the spherical coil spring 55 is arranged on the outer peripheral side of the cylindrical body 31, the lid along the insertion direction of the joining rod 7 is compared with the case of the first embodiment. The dimension of the body 33 can also be shortened.

7 to 10 show the joint structure according to the third embodiment of the present invention. The male joint 3 is the same as that of the first embodiment and relates to the cap 29 of the female joint 5. Since only the configuration is different, this will be described.
As shown in FIGS. 7 to 10, the cap 29 according to this embodiment has an axis O <b> 2 by a holding coil spring (holding biasing means) 61 provided between the lid 33 and the top plate portion 33 a. Is biased in the direction opposite to the insertion direction of the joining rod 7. The biasing force of the holding coil spring 61 is adjusted to a strength that does not deviate from the position where the cap 29 restricts the movement of the sphere 23 when the joining rod 7 is not inserted as shown in FIG. Yes.
With this configuration, as shown in FIG. 7, when the joining rod 7 is engaged with the cylindrical body 31, the cap 29 is held at the tip of the joining rod 7 by the urging force of the holding coil spring 61. Will be.

  In the present embodiment, a recess 63 that is recessed in the insertion direction of the joining rod 7 along the axis O2 is formed in the top plate 33a, and a part of the holding coil spring 61 is accommodated in the recess 63. . That is, the recess 63 prevents the holding coil spring 61 from being displaced. Further, as shown in FIG. 7, a part of the external thread portion 8 formed on the rear end side of the joining rod 7 protrudes from the joining surface 1 a of the first segment 1. In the state where the joining rod 7 is inserted into the female joint 5, a gap can be formed between the first segment 1 and the second segment 2.

By providing the holding coil spring 61 in this way, even if the joining rod 7 is erroneously inserted into the female joint 5, it is possible to pull out the joining rod 7 and reuse the female joint 5.
That is, when the joining rod 7 is pulled out from the female joint 5, first, as shown in FIG. 8, the male screw portion 8 is cut and the joining rod 7 is separated from the first segment 1. Next, the removal cylindrical body 65 is inserted from the rear end side of the joining rod 7, and the distal ends of the removal cylindrical bodies 65 in the insertion direction are brought into contact with the plurality of spherical bodies 23.
Here, as the removal cylindrical body 65, the inner diameter is larger than the outer diameter dimension of the joining rod 7, and the outer diameter is the inner diameter dimension of the hole portion 15 a of the main girder plate 15 and the insertion hole 35 of the housing 21. Use a smaller one. As a result, the removal cylindrical body 65 can be inserted into the insertion hole 15 a of the main girder plate 15 and the insertion hole 35 of the housing 21 while the joining rod 7 is inserted inside the removal cylindrical body 65. Further, the distal end of the removing cylindrical body 65 is brought into contact with the sphere 23 on the radially inner side (side closer to the axis O2) of the cylindrical body 31 than the center of each sphere 23.

Then, when the distal ends of the removal cylindrical bodies 65 are further pressed against the plurality of spheres 23, each sphere 23 is pressed radially outward against the biasing force of the sphere coil spring 27, as shown in FIG. The connecting rod 7 is separated from the engaging recess 11. That is, the engagement state between the joining rod 7 and the female joint 5 is released, and the joining rod 7 can be pulled out from the female joint 5 as shown in FIG.
Here, since the cap 29 is biased by the holding coil spring 61 in the pulling-out direction of the joining rod 7, the cap 29 moves in the pulling-out direction of the joining rod 7 along the axis O2 as the joining rod 7 is pulled out. Then, by pulling out the joining rod 7 and the removing tubular body 65, the plurality of spheres 23 move from the outer peripheral surface of the tapered portion 9 a of the joining rod 7 to the outer peripheral surface 29 a of the cap 29.
Thereby, the cap 29 is arranged on the radially inner side of the plurality of spheres 23, and restricts the urging of the sphere 23 to the radially inner side by the sphere coil spring 27. That is, the female joint 5 can be returned to the state before the joining rod 7 is inserted and reused.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the configuration of the third embodiment including the holding coil spring 61 can also be applied to the configuration of the second embodiment.
Further, as the sphere urging means for urging the sphere 23 inward in the radial direction and the holding urging means for urging the cap 29 in the pulling direction of the joining rod 7, sphere coil springs 27, 55 and holding coils are used. In addition to the spring 61, other elastic bodies such as rubber and hollow urethane may be used.

In addition, when the female joint 5 includes the annular plate portion 51 of the second embodiment, the spherical body 23 is not provided in the taper of the cylindrical body 31 without separately providing spherical biasing means such as the spherical coil spring 55. The spherical body urging means for urging the peripheral surface 37a may be configured by the annular plate portion 51 itself. That is, the flange portion 54 of the annular plate portion 51 may be fixed to the top plate portion 33 a of the lid body 33, and the annular plate portion 52 may be formed to be elastically deformable with respect to the flange portion 54.
Specifically, for example, as shown in FIG. 11, the fan-shaped portion 57 of the annular plate portion 52 divided by the slit 52 c can be elastically deformed in the plate thickness direction of the annular plate portion 52 with respect to the flange portion 54. do it. That is, each fan-shaped portion 57 may be formed as a leaf spring.

 Furthermore, although the annular plate portions 25 and 51 are formed with slits 25c and 52c penetrating in the thickness direction, for example, as shown in FIG. 11, the annular plate portion 51 itself is not configured as a spherical body biasing means. The guide groove portion that is recessed in the thickness direction from at least one end face 25b of the annular plate portion 25 with which the spherical body 23 contacts and extends in the radial direction of the annular plate portion 25 to accommodate a part of each spherical body 23. Should just be formed.

  In addition, the cylindrical body 31 is arranged so that the accommodation portion 37 opens to the distal end side in the insertion direction of the joining rod 7. However, the present invention is not limited to this. For example, the accommodation portion 37 is inserted into the joining rod 7. You may arrange | position so that it may open to the base end side of a direction. In this case, the spherical body 23, the annular plate portion 25, and the spherical coil spring 27 may be disposed from the tapered inner peripheral surface 37 a along the axis O 2 of the insertion hole 35 toward the main beam plate 15. In this configuration, the spherical coil spring 27 is arranged between the annular plate portion 25 and the back surface side of the main beam plate 15, so that the annular plate portion 25 is placed on the distal end side in the insertion direction of the joining rod 7. Since it can be urged, the sphere 23 can be urged radially inward by this urging force.

Further, the engaging recess 11 is formed to be recessed from the outer peripheral surface of the cylindrical portion 9b and the base portion 13 over the circumferential direction of the joining rod 7, but at least part of the circumferential direction so as to accommodate the spherical body 23. What is necessary is just to be depressed in the radial inside from the outer peripheral surface.
In addition, although the cap 29 is provided on the female joint 5, it may not be provided. In this case, for example, the spheres 23 that are adjacent to each other may be supported by using a biasing force that biases the plurality of spheres 23 radially inward.

The joint structure by 1st Embodiment of this invention is shown, and it is explanatory drawing which shows a male joint and a female joint in a separated state. It is the partially broken front view which looked at the female coupling of FIG. 1 from the insertion direction front side of the joining rod. It is a front view which shows the annular plate part which comprises the female coupling | bonding of FIG. In the joint structure of FIG. 1, it is explanatory drawing which shows the stage in the middle of inserting the joining rod of a male joint with respect to a female joint. In the joint structure of FIG. 1, it is explanatory drawing which shows the state after inserting the joining rod of a male joint with respect to a female joint. The joint structure by 2nd Embodiment of this invention is shown, and it is explanatory drawing which shows a male joint and a female joint in a separated state. The joint structure by 3rd Embodiment of this invention is shown, and it is explanatory drawing which shows the state after inserting the joining rod of a male joint with respect to a female joint. In the joint structure of FIG. 7, it is explanatory drawing which shows the stage in the middle of pulling out a joining rod with respect to a female type | mold joint. In the joint structure of FIG. 7, it is explanatory drawing which shows the stage in the middle of pulling out a joining rod with respect to a female type | mold joint. In the joint structure of FIG. 7, it is explanatory drawing which shows the state after pulling out a joining rod with respect to a female type | mold joint. In the joint structure by other embodiment of this invention, it is a front view which shows the annular plate part which comprises a female type | mold joint.

Explanation of symbols

1 First segment (first member)
2 Second segment (second member)
3 Male joint 5 Female joint 7 Joining rod (Male joint body)
9 Head 11 Engaging recess 21 Housing 23 Sphere 25 Circular plate portion 25a Insertion hole 25b One end surface 25c Slit (Guide groove)
27 Coil spring for sphere (sphere urging means)
29 Cap (Regulator)
35 Insertion hole 35a Inner peripheral surface 37 Accommodating part 37a Tapered inner peripheral surface 51 Circular plate part 52a Insertion hole 52c Slit (guide groove part)
55 Coil spring for sphere (sphere urging means)
O1 axis O2 axis

Claims (5)

A joint structure that engages a male joint and a female joint to join the first member having the male joint and the second member having the female joint together,
The male joint body has a male joint body provided with an engagement recess that protrudes radially inward from the outer peripheral surface on the proximal end side of the head portion that protrudes from the joint surface of the first member and is provided on the distal end side. With
The female joint is housed in a housing having an insertion hole that is fixed to the second member and into which the male joint body can be inserted, and a housing portion that is recessed radially outward from the inner peripheral surface of the insertion hole. A sphere that is movable in the radial direction of the insertion hole, and sphere urging means that urges the sphere to protrude radially inward from the inner peripheral surface,
When the male joint main body is inserted into the insertion hole, the sphere is urged toward the engagement recess by the urging force of the sphere urging means, and the accommodating portion and the engagement recess are A joint structure characterized by being arranged across. A regulating member for regulating the urging of the sphere inward in the radial direction by the sphere urging means in a state before insertion of the male joint main body and holding the sphere in the accommodating portion;
2. The joint according to claim 1, wherein when the male joint main body is inserted into the insertion hole, the male joint main body releases the restriction of the movement of the sphere in the radial direction by the restricting means. Construction.   3. The joint structure according to claim 1, wherein the housing portion is formed along a circumferential direction of the inner peripheral surface, and a plurality of the spherical bodies are arranged along the circumferential direction. The accommodating portion has a tapered inner peripheral surface that is formed continuously to the inner peripheral surface along the axis of the insertion hole, and gradually increases in diameter from the inner peripheral surface along the axis.
In the housing, an annular plate portion having an insertion hole that is disposed to face the taper inner peripheral surface through the sphere and into which the male joint main body can be inserted is provided.
The joint structure according to claim 3, wherein the annular plate portion is urged toward the tapered inner peripheral surface along the axis by the spherical body urging means.   The guide groove portion that extends in the radial direction of the annular plate portion and accommodates a part of each sphere is formed on one end surface of the annular plate portion that contacts the spherical body. 4. The joint structure according to 4.

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