JP3792540B2 - Junction structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joining structure suitable for use, for example, when joining a plurality of segments that are joined together to form a cylindrical tunnel wall.
[0002]
[Prior art]
For example, in the case of forming a cylindrical tunnel wall, the segments are generally joined together by bolts. As a structure for joining the segments with this bolt, a joint having holes that communicate with each other when the joint surfaces are brought into contact with each other is embedded in the vicinity of the joint surfaces of the segments. In general, a structure is adopted in which a bolt is inserted into the hole and a nut is fastened to the bolt so that the joining surfaces of the segments are in contact with each other so as to communicate with each other. There is also a structure in which insert fittings which are nut members are embedded in the mutual segments, and bolts penetrating through the adjacent segments are fastened and joined together.
[0003]
[Problems to be solved by the invention]
However, the above-described structure has a problem in that a very complicated operation of inserting a bolt through a hole formed in the joint surface of the joint at the construction site and fastening a nut to the bolt is required. In addition, in the joint structure described above, the segments have to be installed by accurately communicating the hole portions of the joint.
[0004]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a joining structure capable of joining members such as segments very easily.
[0005]
[Means for Solving the Problems]
As means for solving the above problems, a joining structure having the following configuration is employed. That is, the joining structure according to claim 1 according to the present invention is a joining structure in which members are joined in a state in which their joining surfaces are matched, and is provided in one member and extends in the direction of the other member. and deformable joint rod, provided on the other member, the joint rod is constituted by a bonding tool for fixing the junction rods that are inserted, the hook at the tip of the joining rod A bulging portion having an overhanging portion and a substantially conical portion at the tip thereof is formed, a hollow portion opening at the tip is formed inside the bulging portion, and the bulging of the joining rod is formed in the joint parts are provided recesses to be inserted, the inside of the recess enlargement space so as to surround the bulge portion which is inserted, the hollow portion and the joint rod is inserted into the enlarged space Joints in which spherical bodies that are pushed in are arranged independently to form the expansion space The inner wall and wherein the reduced diameter portion to prevent withdrawal of the protruding portion of the bulging portion which is enlarged pushed the spherical body opposite to the insertion direction by engagement is formed in the opening of the recess To do.
[0006]
In this joining structure, when the joining rod is inserted into the recess, the tip end abuts against a spherical body in the recess. Therefore, when a force is applied in the insertion direction, the bulging portion is elastically deformed by pressing the spherical body, the hollow portion is expanded, and the spherical body is pushed into the hollow portion. When the spherical body is swallowed into the hollow part by more than half, the spherical body is accommodated in the hollow part so that the elastic force of the bulging part is also sucked and is caught by the bulging part.
[0007]
When this happens, the bulging part looks enlarged inside the enlarged space, so even if the force to pull out the connecting rod acts, the enlarged bulging part is locked to the reduced diameter part, A joined state is ensured.
[0008]
The joint structure according to claim 2 is characterized in that, in the joint structure according to claim 1, a protrusion is formed on the spherical body, and a hole is formed on the bottom of the recess to fit the protrusion. To do.
[0009]
In this joining structure, since the projection of the spherical body fits into the hole and stays at the bottom of the concave portion, the spherical body does not move when the joining rod is pressed. Thereby, it becomes possible to easily perform the operation of fitting into the hollow portion.
[0010]
The joining structure according to claim 3 is the joining structure according to claim 1, wherein the spherical body is made of iron, and a magnet is installed at the bottom of the recess.
[0011]
In this joining structure, since the iron spherical body is attracted to the magnet and stays at the bottom of the recess, the spherical body does not move when the joining rod is pressed. Thereby, it becomes possible to easily perform the operation of fitting into the hollow portion.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is a joint structure in which members are joined to each other in a state in which their joint surfaces are abutted against each other, and one embodiment thereof will be described below with reference to FIGS. 1 and 2. Of course, it should not be construed as limited thereto. In the following description, a case where the present junction structure is applied to a junction between segments constituting a tunnel will be described as an example.
FIG. 1 is a view showing a bonding structure of the present embodiment, a cross-sectional view in a state before bonding, and FIG. 2 is a cross-sectional view in a state before bonding.
[0013]
As shown in FIG. 1, the joining structure of the present embodiment is fixed to a segment a (one member), a joining rod 10 extending toward a segment b (the other member), and a part of the segment b. Except being buried, it has a schematic configuration in which when the joining rod 10 is inserted, the joining rod 10 is joined by the joining tool 20 that fixes the joining rod 10. The joining rod 10 is fixed to the segment a by screwing the male screw portion 10a formed at the base end to the nut portion 19a of the insert 19 embedded and fixed in the segment a. The connector 20 is fixed by embedding a deformed portion 29 at the proximal end in the segment b.
[0014]
A bulging portion 11 is formed at the tip of the columnar joining rod 10. The bulging portion 11 has a substantially conical shape with a sharp downward portion, and a hook-shaped bulging portion 12 is formed at a portion continuous with the joining rod 10. A hollow portion 13 is formed inside the bulging portion 11. The hollow portion 13 is opened through the opening 13a at the tip of the bulging portion 11.
[0015]
The joining tool 20 is provided with a recess 21 into which the joining rod 10 is inserted. An enlarged space S is formed inside the recessed portion 21 so as to surround the inserted bulged portion 11, and a resin ball (spherical body) 30 is independent of the connector 20 in the enlarged space S. Are arranged.
[0016]
Further, a protrusion 31 is formed on the sphere 30, and a hole 22 into which the protrusion 31 is fitted is formed in the recess 21. Further, the inner wall of the connector 20 that forms the expansion space S is formed with a reduced diameter portion 23 that locks the bulging portion 11 that is swelled by being pushed into the ball 30.
[0017]
The joining operation between the segments a and b by the joining structure having the above configuration will be described.
From the state where both the segments a and b are separated (see FIG. 1), the segment a is moved closer to the concave portion 21 of the segment b so that the joining rod 10 is inserted. The joining rod 10 inserted into the recess 21 with this approaching operation is pressed against the ball 30 disposed in the recess 21 at the tip of the bulging portion 11. When the joining rod 10 is further inserted by applying a force, the bulging portion 11 is elastically deformed and the hollow portion 13 is expanded, and the sphere 30 is pushed into the hollow portion 13 through the opening 13a. When half or more of the sphere 30 is swallowed into the hollow portion 13, the sphere 30 is accommodated in the hollow portion 13 and is captured by the bulging portion 11 so that the elastic force of the bulging portion 11 is also sucked.
[0018]
When this happens, the bulging portion 11 becomes enlarged inside the enlarged space S, so that the overhanging portion 12 of the enlarged bulging portion 11 is reduced in diameter even when a force to pull out the connecting rod 10 acts. 23 (see FIG. 2).
[0019]
Further, since the protrusion 31 of the sphere 30 fits into the hole 22, it stays at the bottom of the recess 21, so that the sphere 30 does not move when the joining rod 10 is pressed. Thereby, the operation of fitting the sphere 30 into the hollow portion 13 can be easily performed.
[0020]
In addition, when the pulling force is applied, the overhanging portion 12 is pushed by the reduced diameter portion 23, and thus a force that pushes and shrinks the opening 13 a acts on the bulging portion 11, and the ball 30 is detached from the hollow portion 13. Be blocked.
Thereby, since the joining rod 10 is fixed to the joining tool 20 so as not to be extracted, the joining operation of the segment a to the segment b is completed.
[0021]
According to this configuration, when joining the segments a and b, it is extremely easy by simply inserting the joining rod 10 provided in one segment a into the connector 20 provided in the other segment b. In addition, the joining rod 10 can be locked to the joining tool 20 and joined to each other.
Thereby, as compared with the conventional structure in which the bolt is inserted into the hole formed in the joint surface of the joint and the nut is fastened, the labor required for the joining work can be greatly reduced. In addition, it is possible to reduce the number of parts to be prepared in the field at the time of joining, to reduce the work of carrying in and preparing parts, and to save labor. Furthermore, it can be expected to contribute to the realization of automatic assembly using robots.
[0022]
Next, another modification of the above embodiment will be described with reference to FIG. 3, but the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In this modification, the sphere 30 is made of steel, and no protrusion is provided, and the sphere 30 is a perfect sphere. Further, in the connector 20, a magnet 25 is installed at the bottom of the recess 21.
[0023]
In this modification, since the steel ball 30 is attracted to the magnet 25 and stays at the bottom of the recess 21, the ball 30 does not move even when the joining rod 10 is pressed. Thereby, the operation of fitting the sphere 30 into the hollow portion 13 can be easily performed.
[0024]
In addition, in the said embodiment and its modification, although the case where the junction structure of this invention was applied to the junction structure of the segments a and b which comprise a tunnel was demonstrated, it is not limited to this, Between other members Of course, it may be applied to bonding.
[0025]
【The invention's effect】
As described above, according to the joining structure according to the present invention, when the joining rod is inserted into the recess and the spherical body is pressed against the tip of the bulging portion, the bulging portion is elastically deformed and the spherical body is formed in the hollow portion. Pushed in. When this happens, the bulging part looks enlarged inside the enlarged space, so even if the force to pull out the connecting rod acts, the enlarged bulging part is locked to the reduced diameter part, A joined state is ensured. Therefore, for example, members such as segments can be joined very easily and firmly.
[0026]
According to the joining structure of the second aspect, the spherical body projection stays in the bottom of the concave portion by fitting into the hole, and when the joining rod is pressed, the spherical body does not move, and the spherical body into the hollow portion Since the insertion can be performed easily, the joining operation is facilitated and the workability can be improved.
[0027]
According to the joining structure of claim 3, the iron spherical body is attracted to the magnet and stays at the bottom of the concave portion, and when the joining rod is pressed, the spherical body does not move and the spherical body into the hollow portion Since the insertion can be performed easily, the joining operation is facilitated and the workability can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a bonding structure according to an embodiment, and is a cross-sectional view in a state before bonding.
FIG. 2 is a view showing the joint structure, and is a cross-sectional view in a state after joining.
FIG. 3 is a view showing another modified example of the embodiment, and is a cross-sectional view in a state before joining.
[Explanation of symbols]
a, b Segment (member)
DESCRIPTION OF SYMBOLS 10 Joining rod 11 Bulging part 12 Overhanging part 13 Hollow part 20 Joining tool 21 Recessed part 22 Hole 23 Reduced diameter part 25 Magnet 30 Sphere (spherical body)
31 Protrusion S Expansion space

Claims (3)

It is a joining structure that joins members in a state in which their joint surfaces are aligned,
An elastically deformable joining rod provided on one member and extending toward the other member;
Provided on the other member, is constituted by a bonding tool for fixing the joint bar by the joining rod is inserted,
A bulging portion having a hook-shaped overhanging portion and a substantially conical portion at the tip thereof is formed at the tip of the joining rod, and a hollow portion opening at the tip is formed inside the bulging portion,
The joint is provided with a concave portion into which the bulging portion of the joining rod is inserted, and an enlarged space is formed in the concave portion so as to surround the bulged portion inserted therein. A spherical body that is pushed into the hollow portion when the joining rod is inserted is independently arranged, and the bulging portion of the bulging portion that has been enlarged by being pushed into the inner wall of the joint forming the expansion space. joint structure reduced diameter portion which is locking the output portion preclude withdrawal of the non-insertion direction, characterized in that it is formed in the opening of the recess. The spherical body protrusions are formed, the bonding structure of claim 1, wherein the bottom of said recess, characterized in that the hole causing fitting the projection is formed.   The joining structure according to claim 1, wherein the spherical body is made of iron, and a magnet is installed at the bottom of the concave portion.

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