JP3957392B2 - Tunnel segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has an opening for inserting a segment gripping bracket on the inner wall surface side of the segment body, and a locked portion to which the segment gripping bracket inserted through the opening can be locked is formed inside. The present invention relates to a tunnel segment provided with a connecting portion for a segment gripping bracket.
[0002]
[Prior art]
Conventionally, this type of segment gripping metal coupling portion 9 (hereinafter simply referred to as “coupling portion”) has been shown in FIG.
That is, the entire shape of the connecting portion 9 is a substantially bottomed shape having a substantially elliptical opening 6 on one side. An anchor portion 15 is formed around the bottom portion so as to project the connecting portion 9 within the concrete 13 layer of the segment 1 in a protruding manner. The connecting portion 9 is embedded in the concrete 13 layer of the segment 1.
The opening 6 is capable of receiving a substantially elliptical segment gripping bracket 5 (hereinafter simply referred to as “grip bracket”) having a locking portion 7, and the locking portion 7 is inserted into the inside of the connecting portion 9. After that, by rotating approximately 90 degrees around the axis of the connecting portion 9, the locking portion 7 is locked to a pair of locked portions 8 provided at positions facing each other across the opening 6. It is configured freely.
In addition, the said holding | grip metal fitting 5 is provided in the erector provided in the shield machine for tunnel excavation, for example. Although not shown, the reaction force when the gripping metal fitting 5 pulls the segment main body 2 is the reaction force receiving portion of the erector at a position different from the opening 6 in the inner wall surface 3. It is obtained by abutting.
The segment 1 is fixed to an erector through the gripping metal fitting 5, and the erector is automatically operated to attach the segment 1 to a predetermined position to construct a tunnel inner wall surface.
[0003]
[Problems to be solved by the invention]
However, the conventional connection method has the following problems. That is, since the connecting portion is embedded in the concrete layer of the segment, the pulling force acting on the locked portion of the segment main body connecting portion from the gripping fitting provided on the erector is Since it was transmitted to the segment body by the anchor part formed around the bottom side of the connecting part, in order to resist the pulling force, high strength concrete and reinforcing bars were embedded in the segment body for reinforcement. There was a need to do. In addition, since the locked portion is located in the vicinity of the opening of the connecting portion, the opening may be enlarged depending on the pulling force with respect to the locked portion, and the opening is to be prevented. the thickness of the part near increasing together to, concrete - it is necessary to ensure the bets head depth.
[0004]
The object of the present invention is to overcome such disadvantages of the prior art, resist the pulling force without depending on the strength of the concrete and the embedded material such as reinforcing bars, and the vicinity of the opening. An object of the present invention is to provide a tunnel segment that prevents the diameter-expanding deformation.
[0005]
[Means for Solving the Problems]
(Constitution)
In order to achieve this object, the first feature of the present invention is that, as described in claim 1, the segment body (2) is made of metal, and the intermediate portion in the width direction of the segment body (2) is provided. By bulging to the inner wall surface (3) side to form a bulging bottom surface portion (10), a concave portion (12) is formed on the inner and outer surfaces of the segment body (2), and in the concave portion (12), A plurality of plate-like vertical ribs (14) extending in the tunnel axis direction are erected, the connecting portion (9) is provided on the bulging bottom surface portion (10), and the connecting portion (9) is configured. A pair of locked portions (8) for retaining and locking the segment gripping metal fitting (5) at positions facing each other across the opening (6), and ribs for reinforcing the connecting portion (9) (11) close to each of the locked portions (8), and the bulging bottom surface portion (10), Serial-shaped longitudinal rib (14), and is provided with a position surrounded on three sides to the connecting portion (9), there the connecting portion (9) in that integrally formed on the segment body (2).
[0006]
(Action / Effect)
According to the tunnel segment of the first aspect of the present invention, the connecting portion is integrally formed with the metal segment main body, so that only the strength of the joint acts on the locked portion of the segment main body connecting portion from the gripping metal fitting. The structure can withstand the pulling force.
That is, in the conventional connecting portion, the pulling force acting on the locked portion is transmitted to the segment body by the anchor portion formed around the bottom side of the connecting portion. In the connecting portion, a pulling force acting on the locked portion can be transmitted to the segment body by a connecting portion formed integrally with the segment body.
Therefore, it is possible to function even without the concrete itself, rather than having to embed and reinforce the high-strength concrete and reinforcing bars in the segment body.
[0008]
Further, at this time, for example, it is conceivable that the segment body formed on the outer wall surface side is integrally connected across the connecting portion located on the inner wall surface side. Since the distance from the opening in the part is increased, the vicinity of the opening is easily deformed in diameter and the weight of the segment body is increased.
According to the onset light tunnel segments, by arranging the ribs for reinforcement at a position close to the engaged portion for retaining engagement exits the end fitting, to increase the intensity of near the engaged portion Can do.
That is, in the conventional connecting portion, in order to prevent the vicinity of the opening from expanding and deforming, it is necessary to increase the thickness near the opening or to secure the cover depth of the concrete. In the connecting portion of the present invention, it is possible to prevent the vicinity of the opening from being enlarged and deformed by the reinforcing rib disposed in the vicinity of the locked portion.
Therefore, it is not necessary to increase the wall thickness in the vicinity of the opening, and it is not necessary to secure the cover depth of the concrete, so that the diameter in the vicinity of the opening can be prevented from being deformed.
(Constitution)
In order to achieve this object, the second characteristic configuration of the present invention is formed on at least the outer surface of the recesses (12) formed on the inner and outer surfaces of the segment body (2) as described in claim 2. The concrete is that the concrete is placed in the recess (12).
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 to 6 show a first embodiment of the tunnel segment of the present invention.
In the figure, reference numeral 2 denotes a segment body made of metal (specifically, made of ductile cast iron) capable of forming the inner wall of the tunnel by connecting a large number in the circumferential direction and the axial direction of the tunnel. As the connection method, for example, a wedge fastening method (not shown) in which adjacent segments are inserted using a wedge inserted so as to straddle both segments, or an adjacent segment is straddled between the two segments. A bolt coupling method (not shown) that couples via bolts that pass through is adopted.
The segment body 2 has a concave portion 12 for placing concrete on the inner and outer surfaces of the segment body 2 by forming a bulging bottom surface portion 10 by bulging an intermediate portion in the width direction toward the inner wall surface side. ing. Then, the segment 13 is formed by driving the concrete 13 in the concave portion 12 for driving the concrete of the segment body 2. Further, a plurality of plate-like vertical ribs 14 extending in the axial direction are provided in the recess 12 of the segment body 2, and the bulging bottom surface portion 10 has a shield machine side. A connecting portion 9 that can freely lock the holding metal fitting 5 formed on the erector is formed integrally with the segment body 2 so as to have an opening 6 at a position facing the inner wall surface 3 side.
4-6, the said connection part 9 has the opening part 6 which can receive the substantially elliptical holding | grip metal fitting 5 which has a latching part 7, while having a substantially cylindrical internal space, After the locking portion 7 of the gripping metal 5 is inserted into the connecting portion 9, the locking portion 7 rotates the opening 6 by rotating approximately 90 degrees around the axis of the connecting portion 9. It is configured to be able to be locked to a pair of locked portions 8 formed by curving the short-side peripheral wall portions opposed to each other toward the center of the opening.
That is, the segment 1 includes a latching portion 7 of a holding metal fitting 5 formed on an erector provided for a shield machine for tunnel excavation and a latched portion of the connecting portion 9 connected to the segment body 2. 8 is held.
Further, the plate-like vertical ribs 14 erected in the concrete placing recesses 12 on the outer wall surface 4 side of the bulging bottom surface portion 10 from a position close to the locked portion 8 in the connecting portion. Reinforcing ribs 11 are separately provided in a state extending over.
That is, by providing the reinforcing rib 11 at a position close to the locked portion 8, the strength in the vicinity of the locked portion 8 is increased, and the locking portion 7 of the gripping metal 5 is connected to the connected portion 9. The diameter expansion deformation in the vicinity of the opening 6 due to the pulling force with respect to the locking portion 8 can be prevented.
[0011]
[Another embodiment]
In the above embodiment, the connecting portion 9 is continuously formed on the bulging bottom surface portion 10 formed by bulging the intermediate portion in the width direction of the segment main body 2 toward the inner wall surface 3 side. Is not something Any shape may be used as long as the connecting portion 9 is integrally formed with the segment body 2.
In the above embodiment, the reinforcing rib 11 for the locked portion 8 in the connecting portion is provided on the outer wall surface 4 side of the bulging bottom surface portion 10, but it may be on the inner wall surface 3 side.
In addition, the reinforcing ribs 11 are provided at positions close to the pair of locked portions 8, but the present invention is not limited to these configurations, and further, at positions orthogonal to the reinforcing ribs 11. A pair of reinforcing ribs 11 may be provided. In the above example, the number of reinforcing ribs is four. However, the number of reinforcing ribs is not limited to this, and may be more.
[0012]
In the claims, reference numerals are used for convenience of comparison with the drawings. However, the present invention is not limited to the configurations of the accompanying drawings.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a segment main body of the present invention. FIG. 2 is a bottom view showing the segment main body of the present invention. FIG. 3 is a longitudinal front view showing a segment of the present invention. FIG. 5 is a cross-sectional view of a main part showing a state in which the engaging part is inserted and engaged with the connecting part of the present invention. FIG. 6 is a main part showing a state in which the engaging part is engaged with the connecting part of the present invention. Cross-sectional view [FIG. 7] Cross-sectional view of the main part showing a state where the engaging portion is engaged with the conventional connecting portion [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Segment 2 Segment main body 5 Grip metal fitting 6 Opening part 7 Locking part 8 Locked part 9 Connection part 10 Swelling bottom face part

Claims (2)

The segment gripping metal fitting (5) having an opening (6) for inserting the segment gripping metal fitting (5) on the inner wall surface (3) side of the segment body (2) and inserted through the opening (6). Is a tunnel segment provided with a connecting portion (9) for a segment gripping metal fitting in which a locked portion (8) that can be freely locked is formed,
The segment body (2) is made of metal, and the bulging bottom surface portion (10) is formed by bulging the width direction intermediate portion of the segment body (2) toward the inner wall surface (3) side, A recess (12) is formed on the inner and outer surfaces of the segment body (2), and a plurality of plate-like vertical ribs (14) extending in the tunnel axis direction are erected in the recess (12). (9) is provided on the bulging bottom surface portion (10), and in order to form the connecting portion (9), the locked portion (8) for retaining and locking the segment gripping metal fitting (5) A pair of ribs (11) that reinforce the connecting part (9) are provided close to the respective locked parts (8) and are provided at positions facing each other across the part (6), and the bulging bottom surface The portion (10), the plate-like vertical rib (14), and the connecting portion (9) are provided at positions surrounded by three sides. Tunnel segments are integrally formed the connecting portion (9) on the segment body (2). The tunnel segment according to claim 1 , wherein concrete is placed in at least a recess (12) formed on the outer surface of the recess (12) formed on the inner and outer surfaces of the segment body (2).

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