JPH0144637Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to tunnel segments.

Special Publication Showa 46-35908 as a tunnel segment
The one described in the publication is well known. This conventional segment had a wave-shaped cross section in a direction perpendicular to the curved direction in order to improve strength.

Generally, this type of segment is formed into a segment ring by joining bolts from the inner surface of the segment via the joining flange at the end in the curved direction inside the tunnel, so when viewed from the inner surface, the troughs of the waveform Connection bolt holes can only be formed in the corresponding connection flange portions. Therefore, the number of joining bolts is limited, and even if the strength of the segments themselves is improved, the joining strength is insufficient.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and its feature is that when viewed from the inner surface side, the part of the corrugated peak and the part of the curved end in contact with the joint flange is formed on the outer surface. A concave portion is formed by bulging out to the side, and a joint bolt hole is provided at a position corresponding to the concave portion of the joint flange.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Tunnel segment 1 according to the present invention shown in the figure
is made of ductile cast iron or the like, has an arcuate wall portion 2, and both ends of the wall portion 2 in the curved direction along the arc,
Joint flanges 3a and 3b are provided at both ends in a direction orthogonal to the curved direction. Arc wall part 2
has a peak 4 that protrudes inward when viewed from the inner surface side (the center side of the arc), and has a ridge 4 that projects inward when viewed from the inner surface side (center side of the arc), and connects the arc wall 2 and the joining flange 3.
A trough portion 5 protruding outward is formed by b. In this way, the arcuate wall portion 2 and the joining flange 3b form a segment 1 whose cross-sectional shape in the direction orthogonal to the curved direction is waveform. These peaks 4 and valleys 5 are opposite valleys and peaks when viewed from the outside. The height difference between the peak portion 4 and the valley portion 5 is the same as the width of the joining flanges 3a and 3b.

A plurality of ribs 7 are provided at predetermined intervals in the curved direction between the inclined wall surface 6 that connects the peak portion 4 and the valley portion 5 and the joining flange 3b. A similar rib 8 is also provided between the inclined wall surfaces 6, 6 extending in parallel along the curved direction.

The joint flange 3b has a joint bolt hole 9,
It is opened at a predetermined pitch in the direction of curvature. Bolt holes 10 are also formed at positions corresponding to the valleys 5 of the joint flange 3a at the ends in the curved direction.

At both ends in the curved direction, a portion of the mountain portion 4 in contact with the joining flange 3a bulges toward the outer surface side, forming a recess 11. The recess 11
is surrounded by box-shaped ribs 12 and is open only inward. Joint flange 3a corresponding to this recess 11
A joining bolt hole 13 is opened at the bottom.

Incidentally, a grout injection port 14 is provided at a predetermined position of the arc-shaped wall portion 2 for injecting a filler into the gap between the tunnel ground and the segment ring. The valley portion 5, the flanges 3a, 3a and the inclined wall surface 6,
The recess 11 surrounded by 6 is filled with a filler such as concrete, reinforced concrete, mortar, etc. from the outside. A cylinder passing through the filler layer is connected to the grout inlet 14 so that the grout inlet 14 is not blocked by the filler.

According to the embodiment of the present invention, when joining the segments 1, the bolts are inserted into the bolt holes 9, 10, 13 of the joining flanges 3a, 3b and fixedly joined. Concave part 1
1, and the bolts can be inserted from the recess 11 into the joining flange 3a, so the number of joining bolts at the ends in the curved direction can be increased, and the joining strength can be improved. Further, since the recess 11 is surrounded by the box-shaped rib 12, the strength of the crest 4 does not decrease due to the provision of the recess 11 in the ridge 4.

Note that the present invention is not limited to the above embodiments.

According to the present invention, it is possible to improve the joint strength of the segments, and it is possible to exhibit great effects in practical use.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a segment showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a sectional view taken along the line of FIG. 1. DESCRIPTION OF SYMBOLS 1... Segment, 2... Wall part, 3... Joining flange, 4... Peak part, 5... Valley part, 11... Recessed part.

Claims (1)

[Scope of utility model registration request] In a tunnel segment having a wavy cross-sectional shape in a direction perpendicular to the curving direction, a portion of the crest of the wavy shape when viewed from the inner surface and in contact with the joint flange at the end in the curving direction bulges outward. A tunnel segment characterized in that a recess is formed and a joining bolt hole is opened at a position corresponding to the recess of the joining flange.