JP2002357097A - Connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure which allows connection of both members such as segments, for instance, in a very simple manner. SOLUTION: The connecting structure is formed of a connecting rod 10 and a connector 20. The connecting rod 10 is arranged in one of the segments a, and comprised of engaging portions 12 which are changeable to form a larger outer diameter and a smaller outer diameter depending on a compressive force from the periphery thereof. The connector 20 is arranged in the other segment b and comprised of introducing portions 21 with which the respective engaging portions 12 engage. According to the connecting structure, both the segments a, b are connected together by inserting and connecting the connecting rod 10 to the connector 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure suitable for use, for example, when joining a large number of segments constituting a cylindrical tunnel wall body.

[0002]

2. Description of the Related Art For example, when constructing a cylindrical tunnel wall, segments are generally joined together by bolts. As a structure for joining the segments with the bolts, a joint having holes communicating with each other when the joint surfaces are brought into contact with each other is buried in the vicinity of the joint surface of the segment. To communicate
In general, a structure is used in which a bolt is inserted into a hole in a state where the joining surfaces of the segments are in contact with each other, and a nut is fastened to the bolt to join. Also, insert inserts that are nut members into the mutual segments,
There is also a structure in which bolts penetrating adjacent segments are fastened and joined to each other.

[0003]

However, the above structure requires an extremely complicated operation of inserting a bolt into a hole formed in a joint surface of a joint at a construction site and fastening a nut to the bolt. There was a problem. In addition, in the above-described joint structure, the segments must be installed such that the holes of the joint are accurately communicated with each other.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joining structure capable of joining members such as segments very easily.

[0005]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the joining structure according to claim 1 is a joining structure in which members are joined in a state where the joining surfaces are abutted with each other, and is provided on one member and extends toward the other member. A joining rod, which is provided on the member on the other side, and which is joined by a joining tool for fixing the joining rod when the joining rod is inserted, wherein the joining rod is provided with an axis portion and the axis center; A plurality of locking portions arranged annularly around the portion, and an elastic portion for urging the locking portions to be spaced apart from the shaft center portion in the radial direction. Depending on the presence or absence of a pressing force from outside, the outer diameter of a circle formed by the outer circumferences of these locking portions can be changed to a large diameter and a small diameter, and the connector has an inner diameter that is larger than the small diameter and smaller than the large diameter. And an insertion portion having an inner diameter larger than the introduction portion and continuous with the introduction portion. Characterized in that it comprises a space portion.

According to the joining structure of the first aspect, when the joining rod provided on one member is brought close to each other so as to be inserted into the joining tool provided on the other member, the joining rod is provided. Each of the locking portions abuts on the introduction portion of the connector and receives a pressing force, and the outer diameter of a circle formed by each locking portion is reduced from a large diameter to a small diameter. When the insertion rod is further inserted, each locking part reaches the insertion space beyond the introduction part and is released from the compression force received from the introduction part, so that the elastic part of the elastic part returns to the original large diameter. Return. Each of the locking portions whose diameters have been increased in this way becomes larger than the inner diameter of the introduction portion and locks to the introduction portion. Therefore, the respective members are joined by the locking force.

According to a second aspect of the present invention, in the joining structure of the first aspect, the shaft portion, the locking portions, and the elastic portion are integrally formed by resin molding, and the elastic portion is formed of a resin. When viewed from the front end side of the connecting rod, the connecting rod is curved in one direction around the axial center portion, and is a plurality of curved plates having the locking portion bonded to an edge thereof. .

According to the joining structure of the second aspect, when the joining rod is inserted into the joining tool, each locking portion of the joining rod comes into contact with the introduction portion of the joining tool and receives a pressing force, which is generated. Since the elastic portions are elastically deformed so as to be further curved in one direction by being transmitted to the elastic portions, the outer diameter of the circle formed by the locking portions is reduced from a large diameter to a small diameter. When the insertion rod is further inserted, each locking part reaches the insertion space beyond the introduction part,
Since the compression force released from the introduction portion is released, each elastic portion returns to the original large diameter in an attempt to return to the original curved shape. In this manner, each locking portion expanded by the elastic force of each elastic portion becomes larger than the inner diameter of the introduction portion and locks to this introduction portion, so that the respective members are joined by this locking force. You.

According to a third aspect of the present invention, there is provided the joining structure according to the first or second aspect, wherein one or both of the locking portions and the introduction portion taper in a direction in which the joining rod is inserted. The guide surface is formed as follows. According to the joining structure of the third aspect, when the joining rod is inserted into the joining tool, it is difficult for the engaging portion and the introduction portion to be caught, and the guide surface smoothly guides the inserting operation. Become like

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a joining structure for joining members in a state where the joining surfaces thereof abut each other. One embodiment of the joining structure will be described below with reference to FIGS. Of course, the present invention should not be construed as being limited to this. In the following description, an example in which the present junction structure is applied to the junction between segments constituting a tunnel will be described. FIG. 1 is a diagram showing a joint structure of the present embodiment, and is a cross-sectional view in a joined state.
FIG. 2 is a cross-sectional view of the joint structure taken along line AA in FIG. FIG. 3 is a diagram showing a main part of the joint structure, and is an enlarged view of a portion B in FIG. FIG. 4 is a diagram showing the operation of each locking portion and each elastic portion of the joining structure, and is a diagram when viewed from the front end side of the joining rod. FIG. 5 is a view showing the joint structure, and is a cross-sectional view in a state before joining.

As shown in FIG. 1, the joining structure of the present embodiment has a joining rod 10 fixed to a segment a (member) on one side and extending toward a segment b (member) on the other side.
And a joint 20 provided on the segment b on the other side and joined by a joining tool 20 for fixing the joining rod 10 when the joining rod 10 is inserted. As shown in FIGS. 1 and 2, the joining rod 10 includes a shaft center portion 11 and a plurality of locking portions 12 annularly disposed around the shaft center portion 11.
And an elastic portion 13 for urging the locking portions 12 to be separated from the shaft portion 11 in the radial direction.
However, the outer diameter d1 of the circle formed by the outer circumferences of the locking portions 12 can be varied between a large diameter and a small diameter depending on the presence or absence of a pressing force from the periphery. The connector 20 is, as shown in FIG.
An inlet 21 having an inner diameter d2 larger than the smaller diameter and smaller than the larger diameter, and an insertion space 22 continuous with the inlet 21 and having an inner diameter d3 larger than the inlet 21 are provided. I have.

The joining rod 10 is a resin-molded (plastic) rod inserted into the joining tool 20, and has a threaded portion 14 formed on the rear end side in the insertion direction, and an insertion direction from the threaded portion 14. Tapered portion 15 tapered toward
A shaft portion 11 formed in a substantially columnar shape from the tapered portion 15, and the locking portions 12 connected around the shaft portion 11 via respective elastic portions 13. Have been. The joining rod 10 is fixed to the segment a so that it cannot be pulled out by screwing the screw portion 14 into an insert nut 16 embedded in the segment a.

The shaft center portion 11, the locking portions 12, the elastic portions 13, the screw portions 14, and the tapered portions 15 are integrally formed by resin molding. As shown in FIGS. 2 and 3, each of the elastic portions 13 curves in one direction (clockwise in FIG. 2) about the axis 11 when viewed from the front end side of the joining rod 10. In addition, there are a plurality of curved plates whose locking edges 12 are joined to the edges. Since each elastic portion 13 has such a shape, when a pressing force that presses the locking portion 12 against the shaft center portion 11 is applied, the elastic portion 13 is elastically deformed in the one direction. Due to the restoring force, a repulsive force for pushing the locking portion 12 back from the shaft center portion 11 can be exerted.

That is, as shown in FIG. 4, in the upper view in a no-load state where no external force is applied, the outer diameter dimension d1 formed by each locking portion 12 is maximum (the large diameter state), and When passing through the introduction portion 21 of the tool 20, the outer diameter dimension d1 is reduced as shown in the figure below because the compression force is applied from the inner wall surface of the thin introduction portion 21 (the small diameter state). When each of the locking portions 12 passes through the introduction portion 21, the locking portion 12 is released from the compressive force. The state returns to the large diameter state shown in the figure. The locking portions 12 whose diameters have been increased in this manner are locked to the introduction portions 21.

As shown in FIGS. 1 and 3, a guide surface 12a that tapers in the insertion direction of the joining rod 10 is formed on the outer periphery of each locking portion 12. Similarly,
A guide surface 21a (chamfer) that tapers in the insertion direction of the joining rod 10 is also formed at an opening (an opening of the introduction portion 21) of the joining tool 20 that receives the guide surface 12a of the locking portion 12. . These guide surfaces 12a, 21a
Is a portion that first comes into contact when the joining rod 10 is inserted,
These tapered shapes serve as guides at the time of insertion so that a smooth insertion operation can be performed.

Referring again to FIG. 1, the connector 20
Is a bottomed cylindrical resin molded product (plastic), which is firmly embedded and fixed in the segment b. The inner shape of the joining portion 20 is formed as a cylindrical space having a constant inner diameter d2 from the opening serving as the guide surface 21a in the introduction portion 21.
3, the insertion space portion 22 is formed continuously as a cylindrical space having a stepped diameter. The insertion space 2
The inner diameter d3 is slightly larger than the large diameter formed by the outer diameter d1 of each locking portion 12, and each locking portion 12 can be sufficiently expanded in the insertion space 22. It has become. Thereby, each locking portion 12 and the introduction portion 21 can be reliably locked.

According to the joining structure having the configuration described above,
The joining operation between the segments a and b will be described below with reference to FIG. As shown in the figure, from the state where the two segments a and b are separated from each other, the other segment a is moved closer to the insertion portion 21 of the connector 20 of one segment b so as to insert the joining rod 10. (Approach in the direction of the white arrow). Then, each locking portion 1 of the joining rod 10
2 comes into contact with the introduction portion 21 of the connector 20 and receives a pressing force,
The outer diameter dimension d1 of the circle formed by each locking portion 12 is reduced from the large diameter to the small diameter. When the insertion of the connecting rod 10 is further advanced, each locking portion 12 moves beyond the introduction portion 21 and the insertion space portion 22.
The inner diameter is released from the compression force received from the introduction portion 21, and the elastic member 13 returns to the original large diameter by the elastic force of each elastic portion 13. Each of the locking portions 12 expanded in diameter in this manner is
When the inner diameter d2 of the introduction portion 21 becomes larger than
1 (the state shown in FIG. 1). Thereby, the joining rod 10
Is fixed to the joining tool 20 so as not to be pulled out, so that the joining operation of the segment a to the segment b is completed.

As described above, the joint structure according to the present embodiment is provided on one segment a, and the locking portion 12 whose outer diameter d1 changes between the large diameter and the small diameter depending on the presence or absence of a pressing force from the surroundings. And the other segment b
And a connector 20 provided with an introduction portion 21 in which each locking portion 12 of the connecting rod 10 is locked.
A configuration is adopted in which the two segments a and b are joined by inserting and connecting the joining rod 10 to the segments. According to this configuration, when the segments a and b are joined to each other, the joining rod 10 provided on one segment a is simply attached to the other segment b.
By inserting the connecting rod 10 into the connector 20 provided in the connector 20, the connecting rod 10 can be very easily engaged with the connector 20 and the segments a and b can be connected to each other.
As a result, compared to 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 joint work can be significantly reduced, and the robot can be used. Automatic assembly can be facilitated. In addition, at the time of joining, the number of components to be prepared on site can be reduced, so that operations such as loading and preparing components can be reduced, and labor can be saved.

The joint structure according to the present embodiment has
1 and each of the locking portions 12 and the elastic portion 13 are integrally formed by resin molding. The elastic portion 13 is curved in one direction around the axis portion 11 and the locking portion 12 is joined to an edge thereof. In this case, a plurality of curved plates are used. According to this configuration, it is possible to obtain a reliable connection between the segments a and b while having an inexpensive configuration. In addition, the joining structure of the present embodiment employs a configuration in which guide surfaces 12a and 21a tapering toward the insertion direction of the joining rod 10 are formed on both the locking portions 12 and the introduction portion 21, respectively. . According to this configuration, a smooth joining operation can be obtained.

In the above-described embodiment and its modifications, the case where the joining structure of the present invention is applied to the joining structure between the segments a and b constituting the tunnel has been described. However, the present invention is not limited to this. Needless to say, the present invention may be applied to joining between other members. In the above embodiment, the guide surface 1 is provided on both the locking portions 12 and the introduction portion 21.
Although 2a and 21a are formed respectively, it is not limited to this, and may be formed on only one of them.

[0021]

According to the first aspect of the present invention, there is provided a joining structure provided on one of the members and having a locking portion whose outer diameter can be changed between a large diameter and a small diameter depending on the presence or absence of a pressing force from the periphery. A rod and a connector provided on the other member and provided with an introduction portion to which each locking portion of the connection rod is locked, and the joining between the two members is performed by inserting and connecting the connection rod to these connectors. The configuration to perform is adopted. According to this configuration, when joining members such as segments together, for example, by simply inserting the joining rod provided on one member into the joining tool provided on the other member, The joining rod is locked to the joining tool, and the respective members can be joined to each other. As a result, compared with the conventional structure in which the nut is fastened by inserting the bolt through the hole formed in the joint surface of the joint,
The labor required for the joining operation can be greatly reduced, and the automatic assembly by the robot can be facilitated. In addition, at the time of joining, the number of components to be prepared on site can be reduced, so that operations such as loading and preparing components can be reduced, and labor can be saved.

Further, in the joint structure according to the second aspect, the shaft center portion, each locking portion and the elastic portion are integrally formed by resin molding, and the elastic portion curves in one direction around the shaft center portion. A configuration in which a plurality of curved plates are joined to the locking portions at the edges is adopted. According to this configuration, it is possible to obtain reliable joining between members even though the configuration is inexpensive.

Further, the joining structure according to the third aspect employs a configuration in which a guide surface that tapers in the insertion direction of the joining rod is formed on one or both of the locking portions and the introduction portion. did. According to this configuration, a smooth joining operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a joint structure of the present invention, and is a cross-sectional view in a joined state.

FIG. 2 is a view showing the same joint structure, and is AA in FIG.
It is sectional drawing seen from the line.

FIG. 3 is a diagram showing a main part of the joint structure, and is an enlarged view of a portion B in FIG. 2;

FIG. 4 is a view showing the operation of each locking portion and each elastic portion of the joining structure, when viewed from the front end side of the joining rod.

FIG. 5 is a view showing the same joint structure, and is a cross-sectional view in a state before joining.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Connecting rod 11 ... Shaft center part 12 ... Locking part 12a, 21a ... Guide surface 13 ... Elastic part 20 ... Joiner 21 ... Introduction part 22 ... Insertion space a, b ... segment (member)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Kitaoka 2- 15-2 Konan, Minato-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Maki Nakasuji 2- 15-2 Konan, Minato-ku, Tokyo Stock (72) Inventor Hiroki Someya 1-12-1, Yurakucho, Chiyoda-ku, Tokyo F-term inside Ishikawashima Construction Materials Industry Co., Ltd. 3J039 AA03 BB01 FA06 FA17 JA04 JA11

Claims (3)

[Claims] 1. A joining structure for joining members in a state where the joining surfaces of the members abut each other, wherein a joining rod provided on one member and extending toward the other member; The joining rod is provided on a member on the side, and is joined by a joining tool for fixing the joining rod when the joining rod is inserted. The joining rod is annularly disposed around the shaft center and the shaft center. A plurality of locking portions, and an elastic portion for urging the locking portions to be separated from the shaft center portion in the radial direction. Each of the locking portions has a pressing force from the periphery thereof. By
The outer diameter of a circle formed by the outer peripheries of these locking portions is variable between a large diameter and a small diameter, and the joining tool has an introduction portion having an inside diameter larger than the small diameter and smaller than the large diameter; And an insertion space portion having an inner diameter larger than the introduction portion. 2. The joining structure according to claim 1, wherein the shaft center portion, each of the locking portions, and the elastic portion are integrally formed by resin molding, and the elastic portion is opposed to a distal end side of the joining rod. A joint structure comprising a plurality of curved plates that are curved in one direction around the axis portion when viewed, and the locking portions are joined to the edges thereof. 3. The joining structure according to claim 1, wherein a guide surface that tapers in a direction in which the joining rod is inserted is formed on one or both of the locking portions and the introduction portion. A joining structure characterized by the following.