JP2562832Y2 - Segment joint structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a segment joint structure in a shield tunnel.

[0002]

2. Description of the Related Art Conventionally, reinforced concrete segments are generally used for primary lining of large-diameter shield tunnels,
A bolt joint structure is often used as the joint. In conventional reinforced concrete segments having a bolted joint structure, the joint is a structural weak point.

[0003] For this reason, the present inventor has disclosed in Japanese Patent Application No. 5-39049.
In the above item, a segment joint structure is provided in which two cotters are provided on the segment joint surface in the upper and lower stages over the entire width of the segment, the cotter female metal fittings are fitted, and the cotter male metal fittings are fitted and fastened over the respective female fittings. Proposed.

[0004]

However, in the above-mentioned segment joint structure, since the sliding length of the male cotter metal fitting when inserted into the female cotter metal fitting is large, the cotter male fitting and the cotter male fitting need to be fitted with high accuracy. High processing accuracy is required for the production of the cotter female hardware, and once fastened with the cotter metal, retightening cannot be performed again.

Further, since the male H-shaped cotter fitting to be fitted is long, the jig used for fitting the fitting becomes large-scale. Further, since the male cotter bracket is long, it is not easy to handle the inserted cotter bracket. Furthermore, since the length of the male cotter fitting to be inserted is the same as the segment width, a long male cotter fitting is to be inserted, requiring a high level of technology for construction.

The present invention has been proposed in view of the above-mentioned problems of the prior art. The object of the present invention is to maintain the high rigidity of the segment joint and to improve the manufacturability of the joint hardware. An object of the present invention is to provide a segment joint structure that can be improved and can be constructed under the same conditions as general shield construction.

[0007]

In order to achieve the above-mentioned object, a segment joint structure according to the present invention is provided with a concave portion at each central portion of adjacent segment joint surfaces, Groove-shaped cotter metal pieces of two horizontally extending upper and lower stages each having an opening at both ends are embedded in a ring joint face orthogonal to the segment joint face, and the groove is formed between the recesses of the adjacent segments. A male H-shaped cotter metal fitting is inserted between the cotter female hardware provided on the joint surface of each segment piece.

[0008]

Since the present invention is configured as described above,
H-shaped cotter male hardware is embedded along the joint surface of each segment from the recess formed by a pair of concave portions provided at the center of each of the adjacent segment joint surfaces. The adjacent segments are joined by fitting over two oppositely extending groove-shaped cotter metal pieces extending horizontally.

[0009] A part of the tip of the male cotter metal fitting into the female cotter metal can be fitted into the recess provided on the ring joint surface of the adjacent segment by penetrating the female cotter metal fitting of the segment. . The concave portion provided on the segment joint surface is filled with a concrete mortar or the like after retightening the cotter joint as necessary.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Reference numeral 1 denotes a segment, in which a concave portion 2 is provided in the center of the adjacent segment joint surface in the longitudinal direction, and a two-stage upper and lower stage having both ends opened in the concave portion 2 and a ring joint surface orthogonal to the segment joint surface. A horizontally extending grooved cotter female hardware 3 is embedded. The grooved cotter female hardware 3 is configured by extending a vertical sleeve 3c from the leading edge of the upper and lower horizontal part 3b in a grooved part composed of the vertical part 3a and the upper and lower horizontal part 3b. .

Numeral 4 denotes an H-shaped cotter male hardware, which is a vertical piece 4a which fits into the groove-shaped piece of the cotter female metal piece 3 facing the H-shaped cotter metal hardware.
And a horizontal piece 4b connecting the opposed vertical pieces 4a. The cotter male metal piece 4 is provided with a taper whose width gradually decreases as it reaches its longitudinal end. Thus, the fastening of the joints of the adjacent segments 1 and 1
This is performed by fitting the male H-shaped cotter metal fittings 4 into the cotter female fittings 3, 3 of each segment 1, 1 from within the recess 5 formed by the recesses 2, 2 of the adjacent segments 1.

In this case, as shown in FIG. 3, a part of the male cotter metal fitting 4 to be fitted is penetrated through the opposed female cotter metal fittings 3, 3 and fitted into the concave portion provided on the ring joint surface of the adjacent segment 1. You can also. After the cotter joint is retightened as necessary, concrete mortar or the like is injected and filled into the recess 5 provided on the segment joint surface.

Next, an embodiment of the segment assembly will be described. Example 1 The [Cotter male fittings 4 assembly in the case of side flush segment] is transported to (b) working face (N + 1) segments B ₁ ring gripped by erector, moved to a predetermined position Then, it is joined to the segments A ₁ and A ₂ of the pre-assembled N-ring by a ring joint. (B) The next segment B ₂ is the first segment B ₁
And joined to the preceding assembly segments A ₁ and A ₂ in the same manner as described above. (C) After joining the rings, a male cotter metal fitting 4 is inserted between the cotter female hardware 3, 3 of the adjacent segment on the segment joint surface in the direction of the arrow in FIG. _1, joining B _2. (D) Hereinafter, the same steps are repeated to assemble one ring. (E) After the ring is assembled, the cotter joint is retightened as necessary, and concrete mortar or the like is injected into the recess 5 and filled. The Example 2 has been transported to [Cotter male fittings 4 assembly in the case of the shape protruding from the side surface of the segment] (b) working face (N + 1) segments B ₁ ring gripped by erector, to a predetermined position The N-ring segments A ₁ and A of the pre-assembled N-ring are moved as shown in FIG.
₂ is fitted and joined to the male H-shaped cotter hardware 4 protruding from the ring joint surface. (B) the next segment B ₂ adjacent to the first segment B _1, joined to the preceding assembly segment ring to the same method as (a). (C) After joining the rings, the male metal member 4 is fitted in the direction of the arrow from the recess 5 provided on the segment joint surface toward the adjacent segment joint surface to join the segments B ₁ and B ₂ . I do. (D) Hereinafter, the same procedure is repeated to assemble one ring. (E) After assembling the ring, the cotter joint is retightened as necessary, and concrete mortar or the like is injected into the recess 5 and filled.

[0014]

As described above, the segment joint structure according to the present invention, as described above, extends horizontally in two stages, a concave portion provided at the center of an adjacent segment joint surface and an upper and lower stage having both ends opened at the ring joint surface. Since the groove-shaped cotter female hardware is buried and the H-shaped cotter male hardware is inserted between the female hardware, the area where the pulling force resists is increased, and the rigid segment joint structure is high. Is configured.
Since the segment girder height is suppressed by having such a high rigid joint, an economical cross section can be obtained.

Further, since the cotter male hardware and the cotter female hardware are used in the segment joint, even when an internal pressure is applied, the meshing of the male and female hardware suppresses the opening of the joint. Further, a concave portion is provided at the center of the segment joint surface, and an H-shaped portion is formed from the concave formed between the concave portions of the adjacent segments to the cotter female hardware provided on each segment joint surface. Since the male and female cotter fittings are configured to be fitted, the length of the male and female cotter fittings is shortened, so that the cotter fittings are easily manufactured, and the joints can be retightened as necessary. Also, the length of the H-shaped cotter male hardware is shortened, the cotter is easy to handle, the insertion jig of the cotter is also small, and the specifications of the shield machine are the same as those for general shield construction. Construction becomes possible, and construction is remarkably improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a segment joint structure according to the present invention.

FIG. 2 is a perspective view showing one embodiment of the segment joint structure according to the present invention.

FIG. 3 is a perspective view showing another embodiment of the segment joint portion according to the present invention.

FIG. 4 is a plan view showing a step of joining segments between rings.

FIG. 5 is a perspective view of FIG. 4;

[Explanation of symbols]

A ₁ segment A ₂ segment B ₁ segment B ₂ segment 1 segment 2 Recessed portion 3 Cotter female hardware 3a Vertical piece 3b Horizontal piece 3c Vertical sleeve piece 4 Cotter male hardware 4a Vertical piece 4b Horizontal piece 5 Concave

Claims (1)

(57) [Scope of request for utility model registration] 1. A concave portion is provided at each central portion of adjacent segment joint surfaces, and two vertically arranged upper and lower stages having both ends opened in a ring joint surface orthogonal to each of the concave portions and the segment joint surface. An H-shaped cotter male metal is embedded between the cotter female hardware provided on the joint surface of each segment by embedding a groove-shaped cotter metal hardware extending from the recess formed between the concave portions of the adjacent segments. A segment joint structure characterized by fitting hardware.