JP3798357B2 - Joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure using male and female joints, and more particularly to a joint structure that facilitates automatic coupling and is particularly suitable for joining tunnel segment blocks.
[0002]
[Prior art]
Conventionally, in tunnel construction, a segment made of steel, reinforced concrete or the like is joined in a cylindrical shape to form a lining. FIG. 6 shows an outline of the assembly.
[0003]
Reference numeral 31 denotes a segment, which is adjacent in the circumferential direction and is joined to the joining surface 31 a of the existing segment 31 from the direction of the arrow and extended in the joining direction to form a segment ring 30.
[0004]
In such a joining method on the joining surface 31a, for example, as described in Patent Document 1, a method of fastening the joining surfaces with bolts and nuts, a hole is provided in the joining surface, and a pin member is fitted. There was a method of fixing by adhesion. Further, as described in Patent Document 2, there is a system in which a triangular pyramid-shaped guide pin is closely fitted into a triangular pyramid-shaped hole and fitted.
[0005]
[Patent Document 1]
JP-A-7-238789 (page 2-4, FIGS. 1-4, FIG. 9)
[Patent Document 2]
JP-A-10-169380 (page 2-4, FIG. 1-2)
[0006]
[Problems to be solved by the invention]
However, these conventional joint structures have the following problems.
In the bolt and nut fastening described in Patent Document 1, fastening is performed from the inside of the tunnel in a state where the segments are opposed to each other.
In addition, the methods using the pin members described in Patent Documents 1 and 2 require high positional accuracy between the pin member and the fitting hole in order to fit the pin member in close contact with each other. As a result, the production cost of the segments is high, and there is a problem that the workability is poor because it takes time to align the positions during the joining operation. In addition, since the pin member is fixed when fitted to one segment, there is a problem that when the other segment is pushed in, the position is slightly shifted and the other segments are damaged. Further, since the conventional joint structure is not suitable for resinization, there is a problem that it cannot be manufactured at low cost by resinization.
[0007]
The present invention has been made in view of such problems, and an object of the present invention is to provide a joint structure in which joining workability is improved and manufacturing at low cost is possible.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention according to claim 1, a joint structure for joining a pair of joined members to be joined to each other with their joining surfaces facing each other, the joined member Is provided with a receiving hole formed by recessing each of the joining surfaces, and one joint fixed to the center of the bottom of the receiving hole, and between each of the joined members, The members to be joined are connected to each other through a joint unit including two insertion parts that can be inserted and the other joint that is provided at the center of each of the insertion parts and engages with the one joint. Use a bonded configuration.
Therefore, since the receiving surface and one joint are provided in the joining surface of each to-be-joined member, and the other joint is provided in a joint unit, it can be set as the to-be-joined member without directionality by a joint kind.
[0009]
According to a second aspect of the present invention, in the joint structure according to the first aspect of the invention, the joint unit has an inner portion of both of the receiving holes facing each other in the thickness direction so that movement in the joint surface direction is restricted during joining. And a plate-like portion provided extending in the joining surface direction so as to be close to the inner periphery of the joint surface of the receiving hole, and a shaft extending from the plate-like portion in the joining direction A configuration comprising a directional support is used.
Therefore, it is possible to carry a shearing force in the joining surface direction by the plate-like portion and to carry an axial force in the joining direction by the axial support body.
Further, since the plate-like portions are provided close to each other in the joining surface direction, even if the joining surface is displaced, the displacement is supported by the plate-like portion and stops.
[0010]
According to a third aspect of the present invention, in the joint structure according to the first or second aspect, the insertion portion and the receiving hole are engaged with each other via an elastic member, and the joint unit is connected to the receiving unit. Use a floatingly supported configuration with respect to the hole.
Therefore, even if the joint unit is misaligned in the joint surface direction when the joint is engaged, the joint unit is floatingly supported so that its position and posture can be changed within the deformation range of the elastic member when an external force is applied. Can absorb misalignment.
[0011]
In invention of Claim 4, in the joint structure in any one of Claims 1-3, the said joint unit consists of synthetic resin, and the said insertion part is comprised by the some fin. Use.
Therefore, a joint having a complicated structure can be manufactured by resin molding, and the amount of material used can be reduced by adopting a fin structure for the insertion portion.
[0012]
According to a fifth aspect of the present invention, in the joint structure according to any one of the first to fourth aspects, the one joint is a male joint in which an engagement protrusion is provided on a shaft-shaped member, and the other The joint is composed of a female joint provided with a claw-like member that engages with the engagement protrusion and is prevented from coming off in the joining direction and that is elastically biased in the axial radial direction of the shaft-like member. Is used.
Therefore, one joint provided in the member to be joined has a simple structure made of a shaft-like member, and a more complicated claw-like member that urges elastic force is provided in the joint unit.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected the same or equivalent member through all the drawings.
FIG. 1 is a perspective view showing an example of an embodiment of a joint structure according to the present invention. In the present invention, a male joint (one joint) (not shown) is provided in the joint surface 1a of the segment 1 (member to be joined) with a predetermined interval in the joint surface 1a. The segments 1 to be joined are connected to each other through the joint units 2 in which the receiving holes 1b are opposed to each other and the female joints (the other joints) are arranged at both ends. is there.
[0014]
FIG. 2 is a cross-sectional view of the vicinity of the joint unit 2.
The segments 1 and 1 are formed of, for example, reinforced concrete, and receiving holes 1b are provided at positions facing each other. The receiving hole 1b is a frustoconical hole provided with a larger diameter on the side of the joining surface 1a, the center axis of which is a normal line of the joining surface 1a and is recessed in the joining surface 1a. In the receiving hole 1b, a male joint 3 having a generally cylindrical shaft shape is extended in the normal direction of the joint surface 1a from the bottom to the joint surface 1a. The outer periphery of the tip of the male joint 3 is provided with an engagement ridge 3a that is provided with a taper on the side of the joint surface 1a and an end surface parallel to the joint surface 1a on the opposite side and that projects in the outer peripheral direction. ing.
[0015]
The male joint 3 may be fixed in any way as long as it has a predetermined pullout strength. For example, an end portion having a retaining shape such as a protrusion may be embedded and integrated in the segment 1, or a screw may be formed on the end portion and screwed to the segment 1. And may be fastened via mounting bolts or may be fixed by welding or the like.
[0016]
The joint unit 2 combines, for example, two housings 2a divided in the axial direction, and accommodates ring joints 4 and 4 that are female joints that can be engaged with the male joints 3 and 3, The outer peripheral portion is provided with an elastic member 5 for floatingly inserting the housings 2a and 2a into the receiving holes 1b. The outer shapes of the housings 2a and 2a have concentric frustoconical shapes slightly smaller than the inner surface of the receiving hole 1b at both ends, and can be easily inserted into the receiving holes 1b from both ends. In the inserted state shown in FIG. 2, the elastic member 5 is elastically deformed and has a dimensional relationship such that it abuts against the inner wall of the receiving hole 1b.
[0017]
Next, the detailed configuration of the housing 2a will be described with reference to FIG. 3 (a) and 3 (b) are an axial sectional view and a side sectional partial sectional view showing a state where the ring joints 4 and 4 are removed from the joint unit 2, respectively.
The structure of the housing 2a is roughly provided with a semicircular plate-like plate-like portion 2b in the center in the axial direction, and a cylindrical portion having a cylindrical shape divided into two from the plate-like portion 2b toward both ends in the axial direction. 2c (axial support) is extended.
[0018]
When the plate-like portion 2b is engaged with the segment 1, the thickness direction is accommodated over the inside of the receiving holes 1b and 1b and the movement in the joining surface direction is restricted, and the plate-like portion 2b is close to the inner surface of the receiving hole 1b. It is equipped with
[0019]
The plate-like portion 2b is provided so as to prevent the deviation from spreading when the segments 1 are displaced within the joint surface 1a due to an external force such as an earthquake. Therefore, the width in the thickness direction and the overall thickness extending to each segment 1 are pressed by the inner surfaces of the receiving holes 1b that are displaced from each other, and when the plate-like portion 2b receives a shearing force, it breaks or sits within a predetermined load. Select appropriately so as not to bend.
[0020]
Further, the gap between the plate-like portion 2b and the receiving hole 1b is determined from the size of the allowable deviation amount of the joint surface 1a. Since only a small amount is displaced in a normal joining state, the allowable displacement amount in this case is set in consideration of the safety of an abnormal situation such as an accident. However, if the distance is too far, the impact load at the time of displacement increases, so it is preferable to set the plate-like portions 2b as thin as possible by setting them as close as possible.
[0021]
Further, the cylindrical portion 2c is provided with tapered insertion portions 2d and 2d so as to have a shape substantially matching the inner surface of the receiving hole 1b from the outside in the axial radial direction, and the insertion portion 2d, Concave grooves 2h and 2h for locking the elastic member 5 on 2d are provided over the outer peripheral direction. In addition, holding grooves 2g and 2g made of concave grooves provided concentrically with the cylindrical portion 2c for supporting the ring joint 4 are provided symmetrically with respect to the plate-like portion 2b inside the cylindrical portion 2c. . The length of the cylindrical portion 2c is set slightly shorter than twice the depth of the receiving hole 1b.
[0022]
Further, in order to engage the housings 2a, locking holes 2e and locking pins 2f that can be fitted to each other are provided on the mating surfaces.
[0023]
Next, a detailed configuration of the ring joint 4 will be described with reference to FIG. FIGS. 4A, 4B, and 4C are a plan view, a cross-sectional view in the axial direction, and a plan view in the bottom direction of the receiving hole 1b, respectively.
The ring joint 4 has a slit 4e from a cylindrical portion 4a that can be fitted into the holding groove 2g of the housing 2a, and an end of the cylindrical portion 4a that is directed to the bottom of the receiving hole 1b when stored in the housing 2a. The claw portions 4b (claw-like members) that are divided into six in the circumferential direction and extend obliquely inward are provided.
[0024]
The front ends of the locking claws 4b are formed with arcuate surfaces 4c on the inner side in the axial radial direction and locking surfaces 4d in the axial direction. The circular arc surfaces 4c are aligned on a circumference having a diameter slightly larger than the shaft diameter of the male joint 3 in the state of the member alone. The locking claw portions 4b are configured so as to have appropriate elasticity in the axial diameter direction by appropriately setting the thickness of the plate and the shape of the portion connected to the cylindrical portion 4a. When receiving an external force from the direction, it bends outward in the axial radial direction and urges an elastic force as a reaction force in the axial radial inner side.
[0025]
Further, a locking flat surface 4d is formed in the axial direction at the tip of the locking claw portions 4b, and the surface pressure received in the axial direction is transmitted to the locking claw portions 4b.
[0026]
In the configuration described above, various materials can be adopted. For example, the housing 2a, the ring joint 4, and the male joint 3 can all employ metals, synthetic resins, and the like. The elastic member 5 may be any member having an elastic property, for example, a synthetic resin such as elastomer, a solid material or foam material of synthetic rubber, or a leaf spring made of metal or synthetic resin. Can do.
[0027]
A particularly effective combination is a housing 2a and a ring joint 4 made of a synthetic resin that can be formed into a relatively small diameter because of its high tensile strength, for example, a male joint 3 made of a metal such as mild steel, and a complicated shape can be integrally formed. Is a combination that forms
[0028]
Next, the operation of the joint structure according to the present invention described above will be described.
First, the joint unit 2 is assembled as follows. The ring joint 4 is fitted into the holding grooves 2g and 2g provided on one side of the housing 2a in such a posture that the tip of the ring locking claw portion 4b faces the plate-like portion 2b side. Then, the other housing 2a is fitted so as to face each other so that the locking hole 2e and the locking pin 2f are fitted. Furthermore, the elastic member 5 is arrange | positioned on the outer periphery.
[0029]
At this time, the elastic member 5 is composed of a synthetic rubber in a band shape, and the elastic members 5 and 5 are arranged so as to be wound around the outer grooves 2h and 2h of the housings 2a and 2a. Assembling is good when it is also fixed.
[0030]
Next, the engagement between the segment 1 and the joint unit 2 will be described.
Since the joint unit 2 according to the present invention is axially symmetric with respect to the central axis and is plane-symmetrical with respect to both end directions, there is no assembling directionality. Therefore, the engagement is performed by pushing any one end of the joint unit 2 into the back side of the receiving hole 1b in accordance with the receiving hole 1b.
[0031]
Since the receiving hole 1b has a larger diameter on the side of the joining surface 1a, it can be inserted into the receiving hole 1b by absorbing an arrangement error such as misalignment of the joint unit 2 according to its size. When pushed in as it is, the male joint 3 enters the inside of the joint unit 2. The engagement protrusion 3a at the tip of the male joint 3 and the inner surface of the locking claw 4b contact each other and exert a force in the axial radial direction. As a result, each center misalignment is gradually corrected, and the joint unit 2 is guided to the center of the receiving hole 1b.
[0032]
When the joint unit 2 is further pushed in, the outer diameter of the engagement protrusion 3a is larger than the inner diameter of the arcuate surface 4c alone, so that the engagement protrusion 3a causes the locking claw 4b to move in the axial direction. It is pushed outward. When the locking claw portion 4b ... gets over the engaging protrusion 3a, the diameter of the male joint 3 is reduced, so that the elastic restoring force of the locking claw portion 4b ... works, and the locking claw portion 4b ... 4c... Returns to a position close to the shaft surface of the male joint 3. And when the engagement protrusion 3a and the latching flat surface 4d contact | abut, it will be in a latching state in the reverse direction to a pushing direction.
[0033]
Further, the plate-like portion 2b enters the inside of the receiving hole 1b within the range of its thickness when engaged, but is largely separated from the inner surface of the receiving hole 1b during the above pushing process. Even if the size is close to the inner surface of the receiving hole 1b at the time, it does not hinder the pushing. Since the joint unit 2 is already almost guided to the central axis of the receiving hole 1b at the final stage of the pressing in which the plate-like portion 2b is close to the inner surface of the receiving hole 1b, the pushing unit is not hindered in the same manner.
[0034]
At this time, the end of the joint unit 2 is in a state of being close to the bottom of the receiving hole 1b with a slight margin, and the elastic member 5 is in contact with the inner surface of the receiving hole 1b and is elastically deformed. It becomes.
[0035]
In this way, the engagement of the joint unit 2 with the segment 1 is completed. In this state, since the ring joint 4 is engaged with the male joint 3 in the pulling direction, the joint unit 2 cannot be pulled out. Further, since the elastic member 5 is interposed between the insertion portion 2d and the receiving hole 1b and elastically supported in the joint surface direction, the joint unit 2 is supported in a floating manner with respect to the segment 1 It is. Therefore, when an external force is applied to the joint unit 2 in the joining surface direction, the joint unit 2 can move within the range of elastic deformation of the elastic member 5. At this time, the male joint 3 and the locking claw portion 4a have a gap in the joining surface direction, and the locking claw portion 4a can be elastically deformed in the axial diameter direction, and therefore does not restrain the movement.
[0036]
When the joint surface 1a of another segment 1 is opposed to the segment 1 with which the joint unit 2 is engaged as described above, and one of the segments 1 is pushed in while aligning the receiving hole 1b and the joint unit 2, By following the same process, each engagement is performed, and as a result, the segments 1 are joined to each other.
[0037]
At this time, the receiving hole 1b is opened with a larger diameter on the joining surface 1a side, and the mating joint unit 2 is supported in a floating manner with respect to the mating segment 1, whereby the respective engagement is achieved. Since a certain degree of positional error is allowed and the centering is automatically performed as described above by continuing to push in, even if a relatively large number of joints are joined, joining is extremely smooth. There is an advantage that workability is improved.
[0038]
Needless to say, this is an excellent advantage in manual work, but even when joining work is automatically performed by an automatic machine, high-precision positioning is not required and work can be performed without requiring a special automatic machine. This is very convenient.
[0039]
Next, the operation after the completion of joining will be described with reference to FIGS.
Since the joint unit 2 according to the present invention is embedded in the segment 1 that can be regarded as a rigid body, an external force acting on the segment 1 due to an earthquake or other external force is mainly applied to the segment 1, It can be divided into a shearing force in the joining surface direction that occurs when 1 shifts and a tensile force that occurs when the segments 1 and 1 try to separate.
[0040]
First, the shear force was mainly carried by providing the plate-like portion 2b. In this case, the plate-like portion 2b should be as close as possible to the opening diameter of the joint surface 1a of the receiving hole 1b, and the support position by the elastic member 5 can be efficiently loaded as it is closer to the joint surface 1a. it can.
[0041]
The tensile force is transmitted to the cylindrical portion 2c via the engaging protrusion 3a and the locking claw portion 4b. Since the inclination of the locking claw 4b is relatively shallow with respect to the male joint 3, it is possible to suppress elastic deformation due to the compressive force applied to the locking claw 4b. Further, by providing the cylindrical portion 2c so as to surround the male joint 3, it is possible to obtain a relatively large cross-sectional area for receiving a load. Furthermore, the load carrying area is further increased by adding the insertion portion 2d.
[0042]
In the present invention, as described above, by devising the configuration, it is possible to efficiently arrange the members for the main load components. For this reason, the amount of material used can be reduced, and in particular, there is an advantage that it can be formed into a shape convenient for manufacturing by resin molding.
[0043]
Further, since the plate-like portion 2b is a disk having a size close to the inner surface of the receiving hole 1b, the plate-like portion 2b contacts the receiving hole 1b when an external force is applied to cause the joining surface to shift. Further, there is an advantage that further displacement can be prevented unless the plate-like portion 2b is destroyed.
[0044]
Next, a modified example related to the present invention will be described with reference to FIG. FIGS. 5A and 5B are a perspective view and a front sectional view, respectively, of a modification according to the present invention.
This modification is characterized in that a joint unit 20 is used instead of the joint unit 2. The joint unit 20 is formed by attaching the ring joints 4 and 4 to an integral housing 20a manufactured by resin molding, and the elastic member 5 is omitted. However, a configuration having elasticity instead of the elastic member 5 is provided integrally with the housing 20a.
[0045]
As shown in FIG. 5, the housing 20a is provided with a disk-like plate-like portion 20b at the center thereof, and cylindrical portions 20c are provided at both ends in the vertical direction therefrom. On the outer side of the cylindrical portion 20c, thin plate-like fins 21 are provided that extend in the circumferential direction at appropriate intervals in the axial direction. The enveloping surface connecting the tips of the fins 21 has a truncated cone shape slightly larger than the inner surface of the receiving hole 1b. Between the fins 21, ribs 22 continuous in the axial direction are provided. The tips of the ribs 22 are slightly smaller in size than the inner surface of the receiving hole 1b, and the spacing between the ribs 22 is enough to prevent the fins 21 from being bent in the axial direction and having appropriate elasticity. It has been. The ribs 22 and the fins 21 constitute an insertion portion 20d by the tips and the enveloping surfaces thereof.
[0046]
Inside the cylindrical portion 20c, there is a hole-shaped holding portion 20g having a stepped bottom portion for dropping the ring joint 4 from both ends of the joint unit 20 and holding it at an appropriate interval from the plate-like portion 20b. Is provided. A locking member mounting portion 20e for mounting a locking member (not shown) for locking the ring joint 4 held by the holding portion 20g from the end side is provided on the axial end portion side of the holding portion 20g. Yes.
[0047]
Since the said locking member should just be able to lock the ring joint 4 from an edge part side, various embodiment can be considered. For example, by using a ring-shaped pressing member, a screw hole is provided in the locking member mounting portion 20e and screwed to the joint unit 20, or by using a C-type retaining ring, the locking member mounting portion 20e has an inner periphery. A groove for a retaining ring can be provided.
[0048]
The size of the plate-like portion 20b is the same as that of the plate-like portion 2b, and when engaged with the segment 1, the thickness direction is accommodated over the receiving holes 1b and 1b and the movement in the joining surface direction is restricted. It is located and has a size close to the inner surface of the receiving hole 1b. The length of the cylindrical portion 20c is slightly shorter than twice the depth of the receiving hole 1b, like the cylindrical portion 2c.
[0049]
Next, the operation of this modification will be described.
First, since the insertion part 20d is composed of thin plate-like members such as fins 21 ..., ribs 22 ..., the material can be reduced and the structure is suitable for resin molding. Moreover, since there is no undercut, it can be molded as a single piece without being divided into a plurality of members.
[0050]
Further, since the fins 21 are elastically deformable, the joint unit 20 is allowed to move in the direction of the joint surface when inserted into the receiving hole 1b, so that the elastic member 5 is provided. The joint unit 20 is supported in a floating manner with respect to the receiving hole 1b. Therefore, since the elastic member 5 can be deleted, there is an advantage that the component cost and the manufacturing cost can be reduced.
[0051]
In the description of the present modification, the plate-like portion 20b and the cylindrical portion 20c have almost the same shape as the plate-like portion 2b and the cylindrical portion 2c, respectively. Nor.
[0052]
In the above description, the plate-like portions 2b and 20b are both disc-shaped, but may have any outer shape as long as the size fits in the receiving hole 1b. For the purpose of carrying the shearing force applied to the joint units 2 and 20 by the plate-like portions 2b and 20b, in order to enlarge the area of the plate portion as much as possible, it is possible to approximate the opening shape of the receiving hole 1b. Preferably, a rotationally symmetric shape is preferable for the purpose of not giving direction to the insertion of the joint units 2 and 20, but the shape is not necessarily limited to a disk. For example, the shape of the receiving hole 1b may be an ellipse or a rectangle other than a circle, and the plate-like portions 2b and 20b may be changed according to the shape.
[0053]
In the above description, the example in which the male joint 3 is provided on the segment 1 side and the female joint is provided on the joint unit 2 side has been described. However, the basis of the technical idea of the present invention is to be joined. This means that the members to be joined are joined by interposing a joint unit between the members, and the male and female types of joints provided on each member are not limited as described above.
[0054]
Furthermore, in the above description, as an example of the member to be joined, a segment constituting a tunnel lining or the like is cited. This is an example in which it is particularly strongly desired to improve workability because it is necessary to efficiently assemble a heavy segment in a narrow work environment, and is given as an example that exhibits a particularly remarkable effect by the present invention. Thus, the member to be joined is not limited to this.
[0055]
【The invention's effect】
As described above, in the first aspect of the present invention, the joint surface of each member to be joined is provided with the receiving hole and one joint, and the other joint is separated from the member to be joined. Because it is provided in the joint unit, it is possible to make a member to be joined that has no directionality depending on the type of joint, so that the member to be joined can be manufactured and joined without considering the directionality, resulting in production efficiency and workability. Has the effect of significantly improving.
This also has the effect of reducing production / working costs.
[0056]
In the invention according to claim 2, since the joint unit is configured to bear the shearing force in the joining surface direction by the plate-like portion and to carry the axial force in the joining direction by the axial support body, The members can be efficiently arranged according to the direction, and as a result, the joint unit can be manufactured with a relatively small amount of material.
Moreover, since such a joint unit can reduce uneven thickness, there exists an effect that it can manufacture easily by resin molding.
Furthermore, even when a displacement occurs on the joint surface, the displacement is stopped by being supported by the plate-like portion, so that there is an effect that no excessive displacement occurs.
[0057]
In the invention according to claim 3, even if the joint unit is misaligned in the joint surface direction when the joint is engaged, the joint unit is supported in a floating manner, so that the misalignment can be absorbed in the deformation range of the elastic member. Therefore, alignment in the joining operation becomes easy, and as a result, there is an effect that workability is remarkably improved.
[0058]
In the invention according to claim 4, since a joint having a complicated structure can be manufactured by resin integral molding, and the amount of material used can be reduced by adopting a fin structure in the insertion portion, There is an effect that an inexpensive joint unit can be manufactured by reducing the material cost.
[0059]
In the invention according to claim 5, one of the joints provided on the member to be joined has a simple structure made of a shaft-like member, and the more complicated claw-like member for biasing the elastic force is provided on the joint unit. This makes it easier to produce larger and more time-consuming to-be-joined members, and provides a relatively small joint unit with a claw-like member that makes production more complicated, making it possible to produce at low cost as a whole. The effect of becoming.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an embodiment of a joint structure according to the present invention.
FIG. 2 is a cross-sectional view showing details of an embodiment of a joint structure according to the present invention.
FIG. 3 is an axial sectional view for explaining an example of a joint unit according to the present invention and a partial sectional view in side view.
FIG. 4 is a plan view in the joint surface direction view, an axial sectional view, and a plan view in the receiving hole bottom direction view for explaining an example of the female joint according to the present invention.
FIGS. 5A and 5B are a perspective view and a partial cross-sectional view in front view of a modification according to the present invention. FIGS.
FIG. 6 is an explanatory diagram showing an outline of how segments are assembled.
[Explanation of symbols]
1 segment (members to be joined)
1a Joint surface 1b Receiving hole 2, 20 Joint unit 2b, 20b Plate-like part 2c, 20c Cylindrical part (axial support)
2d, 20d Insertion part 3 Male joint 3a Engaging protrusion 4 Ring joint (female joint)
4b Locking claw part (claw-shaped member)
4c Arc surface 4d Locking plane 5 Elastic member 21 Fin

Claims (5)

It is a joint structure for joining a pair of members to be joined to each other so as to oppose each other at the joining surface,
The member to be joined includes a receiving hole formed by recessing each joining surface, and one joint fixed to the center of the bottom of the receiving hole,
Two insertion parts that can be inserted into the respective receiving holes between the members to be joined, and the other joint that is provided at the center of each of the insertion parts and engages with the one joint A joint structure characterized in that the members to be joined are joined to each other through a joint unit. In the joint structure according to claim 1,
The joint unit is
In order to restrict movement in the joining surface direction during joining, the joint surface direction is accommodated in both of the opposing receiving holes in the thickness direction and close to the inner periphery of the joining surface of the receiving hole. A plate-like portion provided to extend,
A joint structure comprising an axial support extending from the plate-like portion in the joining direction. In the joint structure according to claim 1 or 2,
The insertion portion and the receiving hole are configured to be engaged via an elastic member,
A joint structure, wherein the joint unit is supported in a floating manner with respect to the receiving hole. In the joint structure according to any one of claims 1 to 3,
The joint unit is made of a synthetic resin,
The joint structure, wherein the insertion portion is composed of a plurality of fins. In the joint structure according to any one of claims 1 to 4,
The one joint is a male joint provided with an engaging protrusion on the shaft-shaped member,
The female joint is provided with a claw-like member that engages with the engaging protrusion and prevents the other joint from coming off in the joining direction and that is elastically biased in the axial radial direction of the shaft-like member. The joint structure.

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