JP3587582B2 - Segment for tunnel - Google Patents

Description

[0001]
[Industrial applications]
The present invention is capable of forming a tunnel inner wall by arranging a large number in the circumferential direction and the axial direction of the tunnel and connecting them to each other, and has a case-shaped iron (including cast iron and steel; the same applies hereinafter) segment body having a concave portion on the inner circumferential side. A plurality of plate-shaped vertical ribs erected in the concave portion on the inner peripheral side of the segment main body and extending in the axial direction; and erected on the inner peripheral side and extended in the peripheral direction. It relates to a tunnel segment with a girder.
[0002]
[Prior art]
Conventionally, as such a tunnel segment, there has been one in which a concave portion of a case-shaped iron (for example, ductile cast iron) segment body is exposed to the inner peripheral side as it is (hereinafter, referred to as a first conventional segment). Further, in order to improve the strength, suppress friction loss of the fluid flowing through the tunnel, etc., the concrete including the concave portion is cast on the inner diameter side of the segment as a secondary lining (hereinafter, referred to as a second lining). 2 conventional segments).
[0003]
[Problems to be solved by the invention]
In the case where the inner wall of the tunnel is formed using the above-mentioned first conventional segment, the segment body made of iron (for example, made of ductile cast iron) is used when the secondary lining for forming the concrete layer on the inner periphery of the segment is not performed. However, since the inner peripheral portion of the segment body is directly exposed in the tunnel, there is a problem that the segment body may be corroded. In addition, since there is unevenness on the inner peripheral portion of the segment body, the unevenness becomes a resistance, and there is also a problem that the friction loss of the fluid passing through the tunnel increases.
The present invention has been made in view of such a situation, and there are a plurality of problems that occur when the first conventional segment and the second conventional segment are used, namely, the corrosion of the segment main body. It is an object of the present invention to provide a means that can solve the problem and the problem of friction loss of a fluid flowing through a tunnel at once.
[0004]
[Means for Solving the Problems]
The characteristic structure of the tunnel segment according to the present invention (hereinafter, referred to as the present invention segment) is that the tunnel inner wall can be formed by arranging and connecting a large number in the circumferential direction and the axial direction of the tunnel and having a recess on the inner circumferential side. A plurality of plate-shaped vertical ribs erected in the recess on the inner peripheral side of the segment main body and extending in the axial direction; A tunnel segment with a spar extending in the direction,
A girder portion extending in the circumferential direction is erected in the concave portion, and an inner peripheral end surface of the girder portion in the concave portion and an inner peripheral end surface of the plate-shaped vertical rib are formed on an inner peripheral edge of the segment body. The segment body is formed in a shape to be retracted further to the outer peripheral side, and a linear steel material for reinforcement is arranged on the inner peripheral side of the plate-shaped vertical rib, and the linear steel material is concreted from the inside thereof. The segment main body is formed in such a shape that the inner peripheral end face of the plate-shaped vertical rib is retracted to the outer peripheral side from the inner peripheral side edge of the segment main body. At the same time, a dent that can be positioned is formed at the inner peripheral end of the plate-shaped vertical rib, a linear steel material for reinforcement is arranged in the dent, and concrete is cast from the inside of the linear steel material. Is buried . It is also conceivable that a reinforcing means such as a dowel is provided on the inner peripheral side, and concrete is poured from the inner diameter side.
[0005]
[Action]
According to the present invention segment with characteristic configuration, the inner peripheral side end surface of the plate-shaped longitudinal rib and an inner circumferential end surface of the girder portion in said recess, to the outer peripheral side than the inner circumferential side edge of the segment body Since the concrete that retreats and covers the inner peripheral end surface is cast from the inner peripheral side, the inner peripheral end surface of the main body in the segment of the present invention has the peripheral portion (depending on conditions, the peripheral edge and the girder inner surface). Except for the side end surface), the surface is not exposed to the inner peripheral side. Therefore, when the segment of the present invention is used, even when the secondary lining is not performed, it is avoided that most of the inner peripheral portion of the iron segment body is directly exposed to the inside of the tunnel. Accordingly, the occurrence of corrosion of the iron segment main body is suppressed.
In addition, since the concrete covering the inner peripheral end face is cast, the inner peripheral portion of the segment main body can be made smooth. Accordingly, the smoothing of the inner peripheral portion reduces the friction loss of the fluid flowing through the tunnel.
Further, in the concrete casting portion, a linear steel material for reinforcement can be arranged on the inner peripheral side of the plate-shaped vertical rib, and a recess that can be positioned at the inner peripheral end of the plate-shaped vertical rib. Is formed, and a linear steel material for reinforcement can be arranged in the depression, and the concrete can be poured so as to bury the linear steel material. It is improved by the presence of the shaped steel material, and by the strength improvement, cracks and falling off at the inner peripheral portion of the concrete can be avoided.
[0006]
【The invention's effect】
Therefore, according to the segment of the present invention, there are a plurality of problems that occur when the first conventional segment and the second conventional segment described above are used, namely, a problem of corrosion of the segment main body and a friction loss of a fluid flowing through a tunnel. Is solved at once, and the object of the present invention is achieved.
[0007]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0008]
1 to 4 show a first embodiment of the segment of the present invention. 1 and 2 show a state before the concrete is poured, and FIGS. 3 and 4 show a state after the concrete is poured.
In the figure, reference numeral 1 denotes a segment made of iron (specifically, made of ductile cast iron), which can form the inner wall of the tunnel by arranging a large number in the circumferential direction and the axial direction of the tunnel and connecting them together to form an inner wall of the tunnel. It is the main body. As the connection method, for example, a wedge fastening method (not shown) in which adjacent segments are stopped by using a wedge (wedge) inserted so as to straddle both of them, A bolt connection method (not shown) or the like in which a connection is made via a bolt that passes over both of them is adopted.
The segment main body 1 is provided with a plurality (three in this embodiment) of plate-like vertical ribs 2 erected in the recess on the inner peripheral side of the segment main body 1 and extending in the axial direction. (See FIG. 1). In addition, the segment body 1 has a girder portion 3 that stands on the inner peripheral side and extends in the circumferential direction. The girder part 3 is composed of three pieces arranged in parallel in the circumferential direction, two of the two ends forming part of a casing of the segment main body 1 and the other one being The plate-shaped vertical ribs 2 are vertically erected at the center of the recesses (see FIG. 1).
The segment main body 1 is formed in a shape that retreats the inner peripheral end face 2a of the plate-shaped vertical rib 2 to the outer peripheral side from the inner peripheral edge of the segment main body 1 (see FIG. 2). In the present embodiment, the inner peripheral end face of the girder portion 3 provided at the center in the concave portion is also formed in a shape to be retracted to the outer peripheral side from the inner peripheral edge of the segment main body 1. On the inner peripheral side of the plate-like vertical rib 2 (and the center girder 3), a plurality of reinforcing linear steel members 6 (specifically, reinforcing bars) are provided. Book), and the linear steel material 6 is buried by casting concrete 4 from the inside thereof (see FIGS. 3 and 4). In addition, in order to easily arrange the linear steel material 6 on the inner peripheral side of the plate-shaped vertical rib 2, the linear steel material 6 can be positioned at the inner peripheral end of the plate-shaped vertical rib 2. The recess 2b is formed.
[0010]
5 and 6 show a second embodiment of the segment of the present invention. FIG. 5 shows a state before the concrete is cast, and FIG. 6 shows a state after the concrete is poured. In the drawings showing the second embodiment, portions denoted by the same reference numerals as those in the first embodiment indicate the same or corresponding portions.
In the figure, 1, as in the first embodiment, can form a tunnel inner wall by connecting together side by side a number in the circumferential direction and the axial direction of the tunnel, the iron (specifically an arc enclosure shape having a concave portion on the inside , Made of ductile cast iron).
The segment main body 1 is provided with a plurality of plate-like vertical ribs 2 erected in the recess on the inner peripheral side of the segment main body 1 and extending in the axial direction. In addition, the segment body 1 has a girder portion 3 that stands on the inner peripheral side and extends in the circumferential direction. The girder portion 3 includes two girder portions 3A arranged in parallel at both ends in the width direction of the segment main body 1 and the main body 1 so as to be parallel to the girder portion 3A at the center in the width direction of the segment main body 1. And a plate-shaped beam portion 3B bent. The beam portions 3A at both ends constitute a part of the casing of the segment main body 1.
The segment main body 1 is formed in such a shape that the inner peripheral end face 2a of the plate-shaped vertical rib 2 is retracted to the outer peripheral side from the inner peripheral edge of the segment main body 1 (see FIG. 5 ). A plurality of (specifically, two) reinforcing linear steel members 6 (specifically, reinforcing bars) are arranged on the inner peripheral side of the plate-like vertical ribs 2. 6 is buried by casting concrete 4 from the inside (see FIG. 6 ). In addition, in order to easily arrange the linear steel material 6 on the inner peripheral side of the plate-shaped vertical rib 2, the linear steel material 6 can be positioned at the inner peripheral end of the plate-shaped vertical rib 2. The recess 2b is formed. In this embodiment, concrete 5 is also cast in the concave portion on the outer peripheral side of the segment main body 1.
[0011]
Next, another embodiment will be described.
[1] The number and form of the plate-like vertical ribs 2, the girder portions 3, and the linear steel materials 6 in each of the above-described embodiments are not limited to the specific numbers and forms described above. For example, as the linear steel material 6, a material other than the above-described rebar, specifically, a steel plate or a bar that is not a rebar may be used.
[2] In each embodiment described above, the shape of the segment main body 1 is an arc-shaped housing, and the inner wall of a tunnel formed by using a segment having the main body 1 as a main part is circular. The inner wall of the tunnel formed by using the segment of the invention may be rectangular. In this case, most of the segment main body 1 has a rectangular parallelepiped casing (not shown).
[3] In each of the above-described embodiments, the material of the segment body 1 is ductile cast iron, but the material may be steel selected as appropriate.
[0012]
In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.
[Brief description of the drawings]
1 is a perspective view showing a state before concrete is poured in a first embodiment of the present invention; FIG. 2 is a longitudinal sectional view thereof; FIG. 3 is a view showing a state after concrete is poured in a first embodiment of the present invention; FIG. 4 is a longitudinal sectional view showing the state before concrete is cast in the second embodiment of the present invention. FIG. 6 is a longitudinal sectional view showing the state before concrete is poured in the second embodiment of the present invention. Longitudinal sectional view showing the state [Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Segment main body 2 Plate-shaped vertical rib 2a Inner peripheral side end surface 2b Depression 3 Girder part 4 Concrete 6 Wire steel

Claims (2)

A tunnel inner wall can be formed by arranging a large number in the circumferential direction and axial direction of the tunnel and connecting them to each other, and a case-shaped iron segment body (1) having a concave portion on the inner circumferential side is provided on the inner circumferential side of the segment body (1). A plurality of plate-shaped vertical ribs (2) erected in the recess and extending in the axial direction; and a girder (3) erected on the inner peripheral side and extending in the circumferential direction. Is a tunnel segment,
A girder portion (3) extending in the circumferential direction is erected in the concave portion, and an inner peripheral end surface of the girder portion (3) in the concave portion and an inner peripheral end surface of the plate-like vertical rib (2) ( 2a) is formed so that the segment body (1) is retracted to the outer peripheral side from the inner peripheral edge of the segment main body (1), and at the inner peripheral side of the plate-shaped vertical rib (2), A tunnel segment in which a reinforcing linear steel material (6) is disposed, and the linear steel material (6) is buried by casting concrete (4) from the inside thereof. A tunnel inner wall can be formed by arranging a large number in the circumferential direction and the axial direction of the tunnel and connecting them to each other. A plurality of plate-like vertical ribs (2) erected in the recess and extending in the axial direction; and a girder (3) erected on the inner peripheral side and extending in the circumferential direction. Is a tunnel segment,
The segment main body (1) is formed in such a shape that the inner peripheral end surface (2a) of the plate-like vertical rib (2) is retreated to the outer peripheral side from the inner peripheral edge of the segment main body (1), A dent (2b) that can be positioned is formed at the inner peripheral end of the plate-like vertical rib (2), and a reinforcing linear steel material (6) is arranged in the dent (2b). A tunnel segment in which a steel material (6) is buried by casting concrete (4) from the inside thereof.

Images