JP2001262980A - Cushioning material-inserted joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb the design error or mounting error of a joint in a joint used for fastening of, for example, a shield segment, in which a T-shaped male joint 11 fits to a female joint 13 having a T-shaped groove and makes contact therewith according to the fitting to provide a wedge effect. SOLUTION: A cushioning material 25 is provided on the T-shaped flange part 19 or 21 of the male joint 11 or female joint 13 making contact each other by the wedge effect. The cushioning material is formed of a steel pipe 27 buried in a rubber material 29. Accordingly, this cushioning material has the property capable of keeping elasticity harder than the rubber material 29 and more flexibly than steel material, so that it absorbs the error and is sufficiently resistant to tension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a joint of a segment used for constructing a shield tunnel for, for example, water supply and sewage.

[0002]

2. Description of the Related Art For example, a segment used as a shield tunnel includes a plurality of segment pieces divided not only in the axial direction of the tunnel but also in the circumferential direction of the tunnel. Assemble as a segment ring while fastening. The applicant has already filed a patent application for the joint used for fastening in the circumferential direction (Japanese Patent Application No. Hei 7-187351). In the joint according to this application, a male joint provided on a joint surface of one segment piece is fitted into a female joint provided on a joint surface of the other segment piece to perform fastening.

FIG. 10 shows an enlarged view of this joint. That is, the male joint 101 has a substantially T-shaped cross section, and the female joint 1
03 has a groove 105 having a substantially T-shaped cross section. Male fitting 1
01 is shorter in the direction in which the fitting proceeds (downward in the figure), and conversely, the T-shaped flange portion 1 of the groove 105 of the female joint 103 is formed.
13 becomes thicker in the direction in which the fitting proceeds.

[0004] By the wedge effect of the two tapered shapes, the female joint 103 and the jaw portion 115 come into contact with each other at the time of fitting, and tension is generated in the web portion 111. Due to this tension, the joint surfaces of the two segment pieces are attracted with a sufficiently large force and fastening is performed. Such a joint has advantages such as simplifying the assembly operation of the segments.

[0005]

However, in order to be able to introduce an appropriate tension into the male fitting web, it is necessary to make the mold manufacturing precision extremely high.
It was difficult in actual production.

It is also conceivable to devise a method in which a part of the male joint 101 undergoes plastic deformation at the time of fitting so as to absorb an error. However, after plastic deformation, the male joint 101 no longer has a sufficient repulsive force. Therefore, it is not suitable because it does not exert sufficient tension. The present invention has been made to solve the above problems, and has as its object to provide a joint structure capable of absorbing a joint error and introducing a sufficient tension to a fastening portion.

[0007]

According to a first aspect of the present invention, there is provided a male joint provided on one of the joint surfaces and having a substantially T-shaped cross section, and provided on the other of the joint surfaces. A female joint having a substantially T-shaped groove into which the male joint fits;
A taper shape formed such that a flange portion forming a substantially T-shape of the male joint and a flange portion forming a substantially T-shape of the groove of the female joint approach each other as the fitting progresses; A cushioning material that is provided at at least one of the above and generates a tension in the male joint by the contact caused by the approach, and a metal pipe material arranged in the fitting direction at the flange portion to constitute the cushioning material. This is a shock absorbing material insertion type joint characterized by the above-mentioned.

[0008] The second invention is a cushioning material insertion type joint, wherein the metal pipe is a steel pipe and is embedded in a rubber material.

The third invention is further characterized in that the tapered shape is formed by shortening a web portion forming a substantially T-shape of the male joint in a direction in which the fitting proceeds. It is an insertion type joint.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. First, FIG. 2 is an overall perspective view of the shield segment 1 in which the joint according to this embodiment is used. Five segment pieces A1, A2, B1, B2, and K divided in the circumferential direction are fastened by the joint according to this embodiment, respectively, to form the ring body 3. This ring body 3 is further fastened in the axial direction. The fastening between the ring bodies 3 is performed by another joint.

FIG. 3 shows the structure of a joint for circumferentially fastening the segment pieces B1, K, B2 constituting the shield segment 1 of FIG. These segment pieces B1, K, B2 are composite segments made of steel and concrete. Inside the concrete skeleton 5, a steel plate 9 provided with a projection 7 for better biting with concrete is arranged in the circumferential direction, and joints 11 and 13 are welded to both ends of the steel plate 9, and the concrete surface is welded. Exposed from

As shown in FIGS. 3 and 1, the joint includes a male joint 11 and a female joint 13, both of which have a substantially T-shaped cross section and are designed to be fitted. T of male joint 11
The web portion 15 forming the character shape is shortened in the direction in which the fitting proceeds, that is, substantially in the left direction in FIG.
Conversely, the jaw portion 19 forming the T-shaped flange portion of the groove 17 of the female joint 13 becomes thicker in the direction in which the fitting proceeds. As a result, the male joint 11 and the female joint 13 each have a tapered shape, and these tapered shapes (1
5) According to (19), a wedge effect is obtained at the time of fitting, and secure fastening is achieved.

The T-shaped flange portion 2 of the male joint 11
A cushioning material 25 is arranged on a surface 23 of one 1 facing the web portion 15. As shown in FIG. 5C, the cushioning material 25 is entirely made of rubber and has a rectangular cross section, a steel pipe 27 is arranged at the center, and a rubber material 29 surrounds the periphery. A steel plate 31 is attached to one end surface of the rectangle. The steel plate 31 facilitates attachment to the flange portion 21,
Uniform force transmission and stable deformation characteristics can be achieved.

By providing such a cushioning material 25, as will be described later, a cushioning material which is harder than a rubber material alone and softer than a steel material alone can be maintained elastic. Thereby, the male joint 11 and the female joint 13
, That is, errors at the time of manufacture, mounting errors, etc., and a sufficient compressive force can be received, and a sufficient tension can be introduced into the web portion 15 as a reaction.

FIG. 4 shows such a segment piece A1,
FIG. 2 is a development view of the shield segment 1 showing a layout in which A2, B1, B2, and K are fastened. Five types of segment pieces A for each ring 3
1, A2, B1, B2, and K are provided. In the drawings, M represents a male joint, and F represents a female joint.

Of these segment pieces, A1 type A
The type 2 has a rectangular developed view, and differs only in the arrangement of the male joint M and the female joint F. Both the B1 type and the B2 type are trapezoids, and two corners of the trapezoid are right angles, and straight sides sandwiched between the right angles are joint surfaces that come into contact with the A1 type or A2 type segment pieces. The oblique sides of the B1 type and B2 type trapezoids are joint surfaces that are in contact with the oblique sides of the K-shaped segment pieces. The KA type is a trapezoid having two hypotenuses, and a press input is finally given out of the five segment pieces to be pressed and fastened to complete the ring body 3.

Each ring body 3 is shifted by a predetermined amount in the circumferential direction, and this shift is performed in a staggered manner. This staggered shifting prevents the joint surfaces from lining up in a row and reducing the overall strength.

The performance of the cushioning member 25 according to this embodiment will be described with reference to FIGS. 5, 6, and 7. FIG. FIG. 5C shows the cushioning material 25 according to this embodiment, and the other (A).
(B) and (D) are cushioning materials used in experiments for comparison. Of these, (A) uses the same cross section as (C) and is made entirely of steel. (B) uses a steel pipe alone as a cushioning material. (D) is a rubber material having the same cross section as (C).

FIG. 6 shows the results of a compression test performed on these cushioning materials. As can be seen from the test results (A)
In the case of using only steel material, the displacement is extremely small even when a large compressive force is applied, and when a further large compressive force is applied, a plastic change is caused to reach a yield point. Therefore,
If there was a large error in the joint, for example, a manufacturing error or mounting error of about 1 mm, it could not be absorbed very much. In the case of the rubber alone of (B), a large displacement is generated by a small compressive force, and a sufficient compressive force cannot be added. In order to withstand a sufficient compressive force, the area receiving the force must be increased, and the joint as a whole becomes too large.

On the other hand, in the case of the steel pipe of (B) and in the case of (C) (the cushioning material comprising the steel pipe 27 and the rubber material 29 according to this embodiment), both are harder than the rubber alone (D), The cushioning material was softer than (A) and could maintain elasticity. That is, the compressive force for a predetermined displacement amount necessary to absorb the design error and the mounting error can be made larger than that of the rubber material, and the joint does not need to be so large. Further, the elasticity can be maintained for such a predetermined displacement amount without yielding unlike steel materials.

(Effects of the Embodiment) As described above, the steel pipe 27 is softer than steel and harder than rubber within the elasticity range. This absorbs joint design errors, and
It becomes a buffer material insertion joint that can exert sufficient tension.

Further, since the steel pipe 27 is embedded in the rubber material 29 as compared with the case of the steel pipe alone, the rubber surface is exposed, and the bonding to the metal or the like becomes relatively easy.
1 is easy to mount. Further, it is expected that the transmission of the force becomes uniform by the interposition of the rubber material 29. Further, it is expected that a water stopping effect is exhibited by the function of the rubber material 29. In addition, there is a special rubber that can be stopped at a high compressive force. However, the cost is high, but the cushioning material 25 is inexpensive, and the cost of the entire joint can be reduced.

(Example) The above embodiment was modified to have a diameter of 380
This was performed on the joints 11 and 13 having the cushioning material 25 of the shield segment 1 for a sewer tunnel for 0 mm, width of 1000 mm and thickness of 150 mm. 6m thick as male joint 11
m effective length 400 mm.

As a result of the design calculation, if an initial tension of 900 kgf / cm 2 is introduced into the web portion 15 of the male joint 11, the stress generated by the design soil water pressure is less than this, so that a high-rigidity joint is used. It turned out that can be realized.

Assuming that the cushioning member 25 shown in FIG. 5C is used, 1) Absorb a dimensional error of about ± 1 mm. 2) Considering the stress relaxation of the rubber material, it is assumed that a stress of 900 kgf / cm2 or more is generated in the web even after the stress relaxation is completed. 4) The web stress immediately after fitting does not exceed 80% of the yield point. The cushioning material 25 satisfying the above conditions was designed. The result of FIG. 7 was obtained based on the experimental result of FIG. 6, and the design compression amount was 4.5.
mm, it was found that the target specification was satisfied.

That is, the designed compression amount of the cushioning material 25 is set to 4.
If it is 5 mm, a web tension of 1400 to 950 kgf / cm 2 can be introduced even if the increase or decrease is 1 mm due to a dimensional error or the like. In this case, the stress value required for design is 900 kg
f / cm2 or more, and web part 1 immediately after fitting
5 has a maximum tensile stress of 2000 kgf / cm2 and does not exceed 80% of the material yield point. The compressive stress of the cushioning material in the table of FIG. 7 is a value obtained by dividing the compressive load at the time of the experiment by the cross-sectional area of the cushioning material.

The cushioning material 25 was attached to the male joint 11 at the factory after the curing of the segment pieces was completed. The joints 11 and 13 between the B-type and K-type pieces consider the insertion angle of the K-type piece,
It is desirable to use a shape different from that between the A-type and A-type pieces and between the A-type and B-type pieces, but if these two types of joints can change the wedge angle of the joint part, One type of joints 11 and 13 can also be used.

Another one-touch fitting was used as a joint between the ring bodies (not shown). The segment assembly was performed in the order of A1, A2, B1, B2, and K shown in FIG. 4, but the pushing force required for fitting between the pieces was as small as about 10 tf per joint, and cracks and the like occurred in the segments. It could be assembled without causing it.

(Other Embodiments) In the above embodiment, the cushioning material 25 attached to the male joint 11 has a steel pipe 27 embedded in a rubber material 29 (FIG. 5C). However, in another embodiment, a buffer member made of only a steel pipe (see FIG. 5B) may be used. In this case, the male joint 11 is attached to the flange portion 21 by, for example, providing a semi-cylindrical recess 33 in the flange portion as shown in FIG. It is also possible to mount the steel pipe 35 by flattening a part of the steel pipe 35 and to attach the flat surface 37 to the flange portion 21 by welding or bonding, as shown in FIG. Further, as shown in FIG. 3C, it is also possible to flatten the ends of the steel pipe 35 by crushing the longitudinal ends thereof, to form a bolt hole in the flat portion 39, and to mount the steel tube 35 with the bolt 41.

In the above embodiment, the cushioning member 25 is formed in the T-shaped flange portion 21 of the male joint 11.
However, in another embodiment, it may be attached to the jaw portion 19 that forms the T-shape of the groove of the female joint 13.

In the above embodiment, FIG.
As shown in (C), the steel plate 31 is attached to one end face of the cross section, but in another embodiment,
For example, as shown in FIG.
1, 31 can be attached. By attaching the steel plate 31 to both end surfaces, this steel plate 3
By receiving the compressive force, the force can be evenly transmitted to the steel pipe 27 and the rubber material 29. Further, as shown in FIG. 3B, such a steel plate may not be provided at all.

Further, as shown in FIG.
5, the steel pipe 27 is unevenly distributed, and a part of the steel pipe 27 can be exposed from the rubber material 29. The exposed position is made to be exposed on the contact surface of the mating joint. Such a cushioning material 25 is manufactured by arranging a steel pipe 27 in a mold at the time of vulcanization using the mold.

Further, in the above embodiment, the segment piece is fastened by the joint. However, in another embodiment, another structure or a mechanical part may be used. Further, in the above embodiment, a steel pipe is used as the metal pipe material. However, in other embodiments, another metal pipe material such as a stainless steel pipe may be used.

[0034]

As described above, according to the first, second, or third aspect of the present invention, a metal pipe is used as a buffer,
The metal tube material is softer than steel material, harder than rubber material, and can maintain elasticity. Therefore, it is possible to provide a buffer material insertion joint that can absorb a design error of the joint and can exert a sufficient tension.

[Brief description of the drawings]

1A and 1B show the operation of a buffer material insertion type joint according to an embodiment of the present invention, in which FIG. 1A shows an initial state in which a male type is inserted into a female type, and FIG. FIG.

FIG. 2 is a perspective view of the entire shield segment fastened by the joint of FIG. 1;

FIG. 3 is a perspective view showing a segment piece constituting the shield segment of FIG. 2;

FIG. 4 is a development view of FIG. 2;

FIGS. 5A to 5D show test materials of a cushioning material used in an experiment showing the effect of this embodiment.

FIG. 6 is a graph showing the results of a compression test using the test material of FIG.

FIG. 7 is a table for organizing the results of FIG. 6;

FIGS. 8A, 8B, and 8C are diagrams showing a male joint according to another embodiment.

FIGS. 9A, 9B, and 9C are cross-sectional views showing a cushioning material according to another embodiment.

FIG. 10 is a perspective view of a male joint and a female joint that constitute a conventional joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield segment A1, A2, B1, B2, K segment piece 3 Ring body 5 Concrete frame 7 Projection 9 Steel plate 11 Male joint 13 Female joint 15 Web part 17 Groove 19 Jaw part 21 Flange part 25 Buffer material 27 Steel pipe 29 Rubber material 31 steel sheet

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masato Honda 1-9-1 Nakase, Mihama-ku, Chiba-shi Mitsui Construction Co., Ltd. (72) Inventor Hiroshi Toida 6-14-11 Tsukushino, Abiko-shi, Chiba ( 72) Inventor Masayuki Fujii 5351 Minamioka, Minoshima-cho, Fukuyama City, Hiroshima Pref. (72) Inventor Kozo Fujii 5351 Minamioka, Minoshima-cho, Fukuyama-shi, Hiroshima F-term (reference) 2D055 GC04

Claims (3)

[Claims] 1. A male joint provided on one of the joint surfaces and having a substantially T-shaped cross section, and a female joint provided on the other of the joint surfaces and having a substantially T-shaped groove into which the male joint fits. A taper shape formed such that a flange portion forming a substantially T-shape of the male joint and a flange portion forming a substantially T-shape of the groove of the female joint approach as the fitting advances;
A cushioning member provided on at least one of the two flange portions to generate a contact on the male joint by the approach and generate a tension in the male joint; and a metal tube material arranged in the fitting direction at the flange portion to constitute the cushioning material. And a shock absorbing material insertion type joint having: 2. The joint according to claim 1, wherein the metal pipe is a steel pipe and is embedded in a rubber material. 3. The tapered shape is formed by shortening a web portion forming a substantially T-shape of a male joint in a direction in which the fitting proceeds.
Or the buffer material insertion type joint according to 2.