JPH06280487A - Segment - Google Patents

Abstract

PURPOSE:To promote work efficiency by forming four sides of comer sections, side slab sections, top slab sections and bottom slab sections in the shape of a bow having the same curvature and the same thickness, and using a joint surface between segments of four sides as a joint surface passing a radius of curvature of a side. CONSTITUTION:In a segment 1, it is formed of side slab section, top slab sections and bottom slab sections 1b in the shape of a bow having the same curvature R and the same thickness T, and corner sections 1a are formed of segments crossed to each other with the same curvature and same thickness. After that, the corner sections 1a are segment pieces 1a as a cross part of a bow-shape of the center HM having a radius R of curvature and thickness T of a point M and a bow-shape of the center HN having the radius R of curvature and thickness T with a point N as the center, and the same corner sections as the other ones are arranged to four corners. Then, joint surfaces adjacent to the segment pieces 1a and 1b are connected to the surfaces connected to bow-shaped center points M, M', N and N' respectively. Four pieces to every segment piece 1a and three pieces to every segment piece 1b make a total of seven pieces of two kinds, and they are combined to form a pair of segments.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to segments used in building tunnels in the ground.

[0002]

2. Description of the Related Art Many shield tunnel segments that have been used in the past are often circular, elliptical, horseshoe-shaped, rectangular, or composite circular due to their sectional shape. , The ground conditions, environmental conditions, etc. were selected as appropriate, and a suitable cross-sectional shape was selected for construction.

Recently, a rectangular tunnel has been developed and constructed for the purpose of effectively utilizing the underground space.
In the construction of this rectangular cross-section tunnel, segments as shown in FIG. 9 are used. In the figure, A is called a corner portion, B is called a side plate portion, C is called a top plate portion, and D is called a bottom plate portion. In particular, the corner portion A is also called a haunch, and a reinforcing inclined portion is provided inside the intersection of the horizontal direction and the vertical direction as one of means for resisting stress concentration.

In each of these segments, the long side to the short side of the corner A are arranged in the four corners in the same direction, and the side plate portion B and the top plate portion C or the bottom plate portion D are arranged, respectively. I was building and assembling. Here, the top plate portion C and the bottom plate portion D are substantially the same segment, and substantially A,
It was customary to construct using 3 types of B and C. Then, the corners A to be arranged next are oriented so that the direction from the longer side to the shorter side thereof is directed in the same opposite direction, and the directions of force concentration are dispersed.

[0005]

However, since the above-mentioned segments have a linear structure, the thickness of each segment must be sufficient, and in order to manufacture each segment from concrete, a material such as a reinforcing bar is used. There is a drawback that the cost and the transportation weight increase, which is uneconomical.

The present invention has been proposed in view of the above circumstances, and its object is to make use of the occupation area and width of a rectangular cross section in consideration of workability such as manufacture, transportation, and assembly. The aim is to provide a simple segment that can be mechanically sufficiently filled even if the thickness is reduced.

[0007]

To achieve the above object, the segment of the present invention has a cross section of a shield tunnel,
In a segment that is composed of four sides of a corner portion, a side plate portion, a top plate portion, and a bottom plate portion and constructs a tunnel having a substantially rectangular shape, the four side portions of the corner portion, the side plate portion, the top plate portion, and the bottom plate portion. Is formed into an arcuate shape having the same curvature and the same thickness. Further, an extension line of each piece-to-piece joint of the segment forming the four side portions is a joint surface passing through a curvature center of each curvature radius.

[0008]

Since the segment of the present invention constructed as described above has an arch structure having an arcuate outer shape, it is possible to increase the mechanical strength and reduce the cross-sectional quantities. Since the four sides of the arcuate shape have the same curvature and the same thickness, the shape is simplified, and the extension line of each piece-to-piece joint of each segment passes through the center of curvature of each curvature radius. Since it is made to be a surface, the external force acting between the pieces can be surely dispersed.

[0009]

Embodiment 1 Hereinafter, one embodiment of the present invention will be described with reference to FIGS.
Explained by. FIG. 1 is a cross-sectional view of a segment 1, which includes a side plate portion, a top plate portion and a bottom plate portion (1b).
Are formed in an arcuate shape with the same curvature R and the same thickness T, and the corners (1a) are formed with the same curvature R and the same thickness T intersecting each other. That is, the segment piece 1b of the right slab has an arcuate shape with a radius of curvature R and a thickness T about the point M, and these top and bottom slabs have a radius of curvature R about the point N and the point N ', respectively. , And is the same as the segment piece 1b formed in a bow shape having a thickness T.

The corner (1a) is, for example, the radius of curvature R of the point M,
In the segment piece 1a at the intersection of the arcuate shape of the center Θ _{M with} the thickness T and the radius of curvature R centered at the point N, the arcuate shape of the center Θ _N with the thickness T, the other corners Exactly the same as 4
It is arranged in a corner.

The joint surfaces of the adjacent sides of the segment pieces 1a and 1b are formed so as to be connected to the central points M, M ', N and N'of the arcuate shape. is there.

4 of these segment pieces 1a are addressed,
In addition, a total of two types of segment pieces 1b (1a
And 1b) 7 pieces are combined to form a set of segments.

FIG. 2 is a side view of FIG. 1, and FIG. 3 is a top view of FIG. As shown in FIGS. 4 and 5, the I-th segment is combined with the I-th segment as shown in FIGS.
The segments of the example I are combined so that the right side plate portion 1b of FIG. 1 is adjacent to the left side plate portion side, and the following example III is combined in the same manner as the example I to construct a shield transformer.

FIG. 6 is a sectional view of a segment showing a second embodiment of the present invention. Also in the segment of the second embodiment, the side plate part is centered on the point M or M ', and the top plate part and the bottom plate part are arcuate with the same curvature R and the same thickness T centering on the point N or N', respectively. And a haunch formed by an inclined surface is provided on the inner side surface of the corner 1a at the intersection of the same curvature R and the same thickness T of the points M and N. Assembly into the tunnel is similar to that of the above-described embodiment.

FIG. 7 is a sectional view of a segment showing a third embodiment of the present invention, in which the haunch of the inclined surface inside the corner of the second embodiment is formed in an arc shape having a small curvature r '.

The second and third embodiments are for reinforcing the corners, and the strength of the corners can be increased by providing these haunches.

The first to third embodiments described above are all arcuate segments having the same curvature R and the same thickness T, and the arches are formed by forming these segments into an arcuate shape. Since the mechanical characteristics of the structure are obtained, the thickness T of the segment can be made thinner than that of the conventional straight type rectangular segment, and the workability of transportation and assembly is also improved.

FIG. 8 is a sectional view of a segment showing a fourth embodiment of the present invention. Also in the segment of this embodiment, the side plate portion is centered on the point M or M ', and the top plate portion and the bottom plate portion are arcuate with the same curvature R and the same thickness T centering on the point N or N', respectively. And a curved portion formed with the same thickness T as the curvature r, which is smaller than the curvature R, is provided at the corners which are the intersections of the four corners. The center of this small curvature r is the intersection point O with the centers of the large curvature R, Θ _M , Θ _{M '} , Θ _N and Θ _N' .

As described above, in the case of the fourth embodiment, since the entire segment has an arcuate shape composed of arcs having different radii of curvature R and r, the mechanical characteristics of the arch structure can be fully utilized and the segment The thickness T can be made thinner, which is economically advantageous.

In the segments of the above-mentioned first to fourth embodiments, even if earth pressure, water pressure, etc. act from the outside of the segments, the adjacent segment pieces do not collapse inside because they mesh with each other. The safety is also extremely high.

Further, considering the order of assembling the segments, in the conventional segment, there is a constraint that the key segments must be combined last, whereas in the segment of the present invention which is the insertion method, which segment piece is the last. It can have a feature that there is no problem even if assembled.

[0022]

As described above, according to the segment of the present invention, the shield tunnel has a substantially rectangular cross section, which is composed of the four sides of the corner portion, the side plate portion, the top plate portion, and the bottom plate portion. In the segment to be constructed, the four side portions of the corner portion, the side plate portion, the top plate portion, and the bottom plate portion are formed in an arc shape having the same curvature and the same thickness, and the four side portions are formed. Since the extension line of each piece-to-piece joint of the segment to be formed is a joint that passes through the center of curvature of each radius of curvature, making use of the occupied area and width of the rectangular area, manufacturing,
There is an advantage that it can be thinned in consideration of workability of transportation and assembly, and can be used as a simple segment that is mechanically safe.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a top view of FIG.

FIG. 4 is a top view of a combination of the segments of FIG.

5 is a top view of a combination of the segments of FIG.

FIG. 6 is a sectional view of a second embodiment of the present invention.

FIG. 7 is a sectional view of a third embodiment of the present invention.

FIG. 8 is a sectional view of a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a conventional example.

[Explanation of symbols]

 1 segment 1a corner segment piece 1b side plate part, top plate part, bottom plate part segment piece R radius of curvature T thickness

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukihiro Kitamura 1-24-4 Shinkawa, Chuo-ku, Tokyo Daitoken Construction Co., Ltd.

Claims (2)

[Claims] 1. A segment for constructing a tunnel having a substantially rectangular shape in which a cross section of a shield tunnel has four sides of a corner portion, a side plate portion, a top plate portion, and a bottom plate portion, and the corner portion and the side plate portion. A segment characterized in that the four sides of the top plate portion and the bottom plate portion are formed in an arc shape having the same curvature and the same thickness. 2. A segment characterized in that an extension line of each piece-to-piece joint of the segment forming the four sides is a joint surface passing through a center of curvature of each radius of curvature.