JP2008144496A - Joint structure of precast member, and precast member - Google Patents

Joint structure of precast member, and precast member Download PDF

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JP2008144496A
JP2008144496A JP2006334194A JP2006334194A JP2008144496A JP 2008144496 A JP2008144496 A JP 2008144496A JP 2006334194 A JP2006334194 A JP 2006334194A JP 2006334194 A JP2006334194 A JP 2006334194A JP 2008144496 A JP2008144496 A JP 2008144496A
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curved surface
joint
precast member
convex curved
segment
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JP4839197B2 (en
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Takuji Komiya
卓司 小宮
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KANEYASU KK
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KANEYASU KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of precast members of a type allowing rotation of an abutting part, and provided with a structure for avoiding formation of cracks, chips or the like at the abutting part. <P>SOLUTION: In the joint structure of the precast members formed by making joint surfaces 11, 12 of the two adjacent precast members 1, 1 abut each other, the joint surface 11 is formed into an S shape in cross section by a projecting curved surface 11a and a recessed curved surface 11b, and the joint surface 12 is formed into the S shape in cross section by a projecting curved surface 12a and a recessed curved surface 12b. The projecting curved surface 11a and the recessed curved surface 11b of the precast member 1 abut on the recessed curved surface 12b and the projecting curved surface 12a of the other precast member 1, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、土木構造物や建築構造物を構築する際に使用されるプレキャスト部材およびその接合構造に関する。   The present invention relates to a precast member used when a civil engineering structure or a building structure is constructed, and a joint structure thereof.

シールドトンネルの一次覆工を構成するセグメント（プレキャスト部材）の接合構造として、一方のセグメントの継手面に設けた円弧面状の凹曲面に他方のセグメントの継手面に設けた円弧面状の凸曲面を突き合せることで形成されるナックルジョイント式の接合構造（継手構造）が知られている（例えば、特許文献１乃至特許文献３参照。）。   As a joint structure of the segments (precast members) constituting the primary lining of the shield tunnel, the arc-shaped convex curved surface provided on the joint surface of the other segment on the arc-shaped concave curved surface provided on the joint surface of one segment There are known knuckle joint type joint structures (joint structures) formed by abutting each other (see, for example, Patent Document 1 to Patent Document 3).

ナックルジョイント式の接合構造は、突合部分の回転を許容する形式の接合構造であり、曲げモーメントを伝達しないヒンジに近い構造であることから、継手金物を介して結合する場合に比べて、セグメントに発生する曲げモーメントを小さくすることが可能となり、ひいては、セグメントの小断面化を図ることが可能となる。   The knuckle joint type joint structure is a type of joint structure that allows rotation of the abutting part, and is a structure close to a hinge that does not transmit bending moment. The generated bending moment can be reduced, and consequently the segment can be reduced in cross section.

特開２００１−２８８９９２号公報（図６）JP 2001-288992 A (FIG. 6) 特開平８−３２６４８８号公報JP-A-8-326488 特開２００２−０１３３９３号公報（図１）JP 2002-013393 A (FIG. 1)

特許文献１乃至特許文献３に開示された接合構造では、突合部分の回転を許容するために、突合部分以外の継手面間にクリアランスを設ける必要があるが、このようにすると、一方のセグメントの凸曲面と他方のセグメントの凹曲面との接触部分に応力が集中することになるので、突合部分にひび割れや欠け等が発生する虞がある。また、特許文献１乃至特許文献３に開示された接合構造では、突合部分の回転量が大きくなったときに、セグメントの角部同士が接触することになるので、それ以上の回転が制限されるだけでなく、角部にひび割れや欠け等が発生する虞もある。   In the joint structure disclosed in Patent Documents 1 to 3, it is necessary to provide a clearance between joint surfaces other than the abutting part in order to allow rotation of the abutting part. Since stress concentrates on the contact portion between the convex curved surface and the concave curved surface of the other segment, there is a possibility that cracks, chips, etc. may occur at the abutting portion. In addition, in the joint structures disclosed in Patent Document 1 to Patent Document 3, when the rotation amount of the abutting portion increases, the corner portions of the segments come into contact with each other, and thus further rotation is limited. In addition to this, there is a possibility that cracks, chips, etc. may occur at the corners.

なお、前記した問題は、シールドトンネルの一次覆工の場合に限らず、トンネルの内空に設置される補修用の覆工、立坑、サイロなどの筒状の構造物を構成するプレキャスト部材の接合構造や、２ヒンジや３ヒンジのアーチカルバートなどを構成するプレキャスト部材の接合構造として、突合部分の回転を許容するナックルジョイント式の接合構造を採用する場合に共通して当てはまる問題である。   The above-mentioned problem is not limited to the primary lining of shield tunnels, but the joining of precast members that constitute tubular structures such as repair linings, shafts, and silos that are installed inside the tunnel. This is a problem that is commonly applied when a knuckle joint type joining structure that allows rotation of the abutting portion is adopted as the joining structure of the precast member constituting the structure or the arch culvert of two hinges or three hinges.

このような観点から、本発明は、突合部分の回転を許容する形式のプレキャスト部材の接合構造であって、突合部分にひび割れや欠け等が発生し難い構成を具備したプレキャスト部材の接合構造を提供することを第一の課題とし、この接合構造に使用されるプレキャスト部材を提供することを第二の課題とする。   From such a point of view, the present invention provides a precast member joining structure of a type that allows rotation of the abutting portion, and has a configuration in which cracks, chips, etc. are unlikely to occur in the abutting portion. This is a first problem, and a second problem is to provide a precast member used for this joining structure.

前記した第一の課題を解決する本発明に係るプレキャスト部材の接合構造は、隣接する二つのプレキャスト部材の継手面同士を突き合せることで形成されるプレキャスト部材の接合構造であって、前記継手面が、凸曲面と凹曲面とによって断面Ｓ字状に成形されており、一方の前記プレキャスト部材の前記凸曲面および前記凹曲面が、それぞれ他方の前記プレキャスト部材の前記凹曲面および前記凸曲面に突き合されていることを特徴とする。   The joint structure of a precast member according to the present invention that solves the first problem described above is a joint structure of a precast member formed by abutting joint surfaces of two adjacent precast members, the joint surface However, the convex curved surface and the concave curved surface of one of the precast members protrude into the concave curved surface and the convex curved surface of the other precast member, respectively. It is characterized by being combined.

本発明に係るプレキャスト部材の接合構造は、要するに、凸曲面と凹曲面とによって断面Ｓ字状に成形された継手面同士を突き合せるところに特徴がある。このようにすると、突合部分における回転が許容されることになるので、従来のナックルジョイント式の接合構造と同様に、プレキャスト部材に発生する曲げモーメントを小さくすることが可能となり、ひいては、プレキャスト部材の小断面化を図ることが可能となる。特に、本発明では、一方のプレキャスト部材の凸曲面および凹曲面を、他方のプレキャスト部材の凹曲面および凸曲面に突き合せることとしたので、突合部分での応力集中が起こり難く、したがって、突合部分にひび割れや欠け等が発生し難くなる。なお、本発明では、一方のプレキャスト部材の凸曲面および凹曲面を、他方のプレキャスト部材の凹曲面および凸曲面に突き合せているので、継手金物等を使用しなくとも、突合部分においてせん断力を伝達することができる。   In short, the precast member joining structure according to the present invention is characterized in that joint surfaces formed into a S-shaped cross section are butted together by a convex curved surface and a concave curved surface. In this way, since rotation at the abutting portion is allowed, it becomes possible to reduce the bending moment generated in the precast member as in the case of the conventional knuckle joint type joint structure. A small cross section can be achieved. In particular, in the present invention, since the convex curved surface and the concave curved surface of one precast member are abutted with the concave curved surface and the convex curved surface of the other precast member, stress concentration is unlikely to occur at the abutting portion. Cracks and chips are less likely to occur. In the present invention, since the convex curved surface and the concave curved surface of one precast member are abutted with the concave curved surface and the convex curved surface of the other precast member, the shear force is applied to the abutting portion without using a fitting metal or the like. Can communicate.

本発明においては、一方の前記プレキャスト部材の前記継手面および他方の前記プレキャスト部材の前記継手面のそれぞれにおいて、前記凸曲面および前記凹曲面を連続させ、前記凸曲面と前記凹曲面の境界における前記凸曲面の接線および前記凹曲面の接線を一致させることが望ましい。このようにすると、凸曲面と凹曲面とが滑らかに連なることになるので、突合部分にひび割れや欠け等が発生し難くなる。   In the present invention, in each of the joint surface of one of the precast members and the joint surface of the other precast member, the convex curved surface and the concave curved surface are made continuous, and the boundary between the convex curved surface and the concave curved surface is It is desirable to make the tangent of the convex curved surface coincide with the tangent of the concave curved surface. If it does in this way, since a convex curved surface and a concave curved surface will continue smoothly, it will become difficult to generate | occur | produce a crack, a chip | tip, etc. in a butt | matching part.

本発明においては、前記凸曲面および前記凹曲面を円弧面とし、一方の前記プレキャスト部材の前記凸曲面および前記凹曲面を、それぞれ他方の前記プレキャスト部材の前記凹曲面および前記凸曲面に面接触させることが望ましい。このようにすると、突合部分における回転を許容しつつ、継手面同士の接触面積を増大させることが可能となるので、応力がより広範囲に分散し、突合部分にひび割れや欠け等がより一層発生し難くなる。   In the present invention, the convex curved surface and the concave curved surface are arc surfaces, and the convex curved surface and the concave curved surface of one of the precast members are brought into surface contact with the concave curved surface and the convex curved surface of the other precast member, respectively. It is desirable. In this way, it is possible to increase the contact area between the joint surfaces while allowing rotation at the abutting portion, so that the stress is dispersed over a wider range, and cracks and chips are further generated in the abutting portion. It becomes difficult.

なお、継手面の寸法等に特に制限はないが、他方の前記プレキャスト部材の前記凹曲面の半径を、一方の前記プレキャスト部材の前記凸曲面の半径と同一にするとともに、他方の前記プレキャスト部材の前記凸曲面の半径を、一方の前記プレキャスト部材の前記凹曲面の半径と同一にすることが望ましく、より好適には、前記凸曲面の半径および前記凹曲面の半径を前記プレキャスト部材の厚さ寸法の１／２と等しくすることが望ましい。   The dimensions of the joint surface are not particularly limited, but the radius of the concave surface of the other precast member is the same as the radius of the convex surface of one of the precast members, and the other precast member has the same radius. It is desirable to make the radius of the convex curved surface the same as the radius of the concave curved surface of one of the precast members, and more preferably, the radius of the convex curved surface and the radius of the concave curved surface are the thickness dimensions of the precast member. It is desirable to make it equal to 1/2.

前記した第二の課題を解決する本発明に係るプレキャスト部材は、コンクリート構造物を構成するプレキャスト部材であって、隣接する他のプレキャスト部材に突き合わされる継手面が、凸曲面と凹曲面とによって断面Ｓ字状に成形されていることを特徴とする。   The precast member according to the present invention that solves the second problem described above is a precast member constituting a concrete structure, and a joint surface that is abutted against another adjacent precast member is formed by a convex curved surface and a concave curved surface. It is characterized by being formed into a S-shaped cross section.

本発明に係るプレキャスト部材によれば、これと同様の構成を具備する他のプレキャスト部材の継手面に突き合せることで、突合部分にひび割れや欠け等が発生し難い接合構造を得ることが可能となる。   According to the precast member according to the present invention, it is possible to obtain a joint structure in which cracks, chips, and the like are unlikely to occur at the abutting portion by abutting against the joint surface of another precast member having the same configuration as this. Become.

本発明に係るプレキャスト部材の接合構造によれば、突合部分にひび割れや欠け等が発し難くなる。また、本発明に係るプレキャスト部材によれば、これと同様の構成を具備する他のプレキャスト部材に突き合せることで、突合部分にひび割れや欠け等が発生し難い接合構造を得ることが可能となる。   According to the joint structure of the precast member according to the present invention, it is difficult for cracks, chips, and the like to occur at the abutting portion. Moreover, according to the precast member which concerns on this invention, it becomes possible to obtain the joining structure where a crack, a chip | tip, etc. do not generate | occur | produce easily by butting to the other precast member which comprises the same structure as this. .

本発明に係るプレキャスト部材およびその接合構造を実施するための最良の形態を、添付した図面を参照して詳細に説明する。   Best Mode for Carrying Out the Invention A precast member and a joining structure thereof according to the present invention will be described in detail with reference to the accompanying drawings.

本実施形態に係るプレキャスト部材は、図１に示すように、円筒状のコンクリート構造物であるセグメントリングＲを構成するシールドトンネル用のセグメント１である。なお、図示は省略するが、複数のセグメントリングＲをトンネル軸方向（図１では紙面垂直方向）に連設すると、シールドトンネルの一次覆工が形成される。   As shown in FIG. 1, the precast member according to the present embodiment is a shield tunnel segment 1 that constitutes a segment ring R that is a cylindrical concrete structure. Although illustration is omitted, when a plurality of segment rings R are arranged in the tunnel axis direction (the vertical direction in FIG. 1), the primary lining of the shield tunnel is formed.

セグメント１は、鉄筋コンクリート製であり、円筒を複数個（本実施形態では七つ）に等分割した形態を呈している。すなわち、セグメント１は、図２に示すように、平面視した形状が矩形形状を呈しており、トンネル軸方向から見た形状が円弧状を呈している。より詳細に説明すると、セグメント１は、図３の（ａ）にも示すように、周方向の端面である一対の継手面１１，１２と、セグメントリングＲ（図１参照）の外周面となる円弧面状の外面１３と、セグメントリングＲの内周面となる円弧面状の内面１４と、トンネル軸方向の端面である側面１５とを備えている。なお、一対の継手面１１，１２を区別する場合には、それぞれ「第一継手面１１」および「第二継手面１２」と称する。また、外面１３および内面１４と同心の円弧面であって外面１３および内面１４の中央に位置する円弧面を「中心面１６」と称する。   The segment 1 is made of reinforced concrete and has a form in which a cylinder is equally divided into a plurality (seven in this embodiment). That is, as shown in FIG. 2, the segment 1 has a rectangular shape in plan view, and has a circular arc shape when viewed from the tunnel axis direction. More specifically, as shown in FIG. 3 (a), the segment 1 becomes a pair of joint surfaces 11 and 12 that are circumferential end surfaces and an outer peripheral surface of the segment ring R (see FIG. 1). An arcuate outer surface 13, an arcuate inner surface 14 that serves as an inner peripheral surface of the segment ring R, and a side surface 15 that is an end surface in the tunnel axis direction are provided. In addition, when distinguishing a pair of joint surfaces 11 and 12, it calls the "first joint surface 11" and the "second joint surface 12", respectively. An arc surface that is concentric with the outer surface 13 and the inner surface 14 and is located at the center of the outer surface 13 and the inner surface 14 is referred to as a “center surface 16”.

第一継手面１１は、隣接する他のセグメント１の第二継手面１２に突き合わされる部位であり、図３の（ｂ）にも示すように、凸曲面１１ａと凹曲面１１ｂとによって断面Ｓ字状に成形されている。なお、第一継手面１１の断面形状は、セグメント幅方向に一様である。   The first joint surface 11 is a part that is abutted against the second joint surface 12 of another adjacent segment 1, and as shown in FIG. 3B, a cross section S is formed by the convex curved surface 11a and the concave curved surface 11b. Shaped in a letter shape. The cross-sectional shape of the first joint surface 11 is uniform in the segment width direction.

凸曲面１１ａは、隣接する他のセグメント１側に凸な曲面であり、本実施形態では、中心面１６よりも外面１３側に形成されている。本実施形態の凸曲面１１ａは、円弧面であり、この円弧面の中心Ｐａは、中心面１６と同心の円弧面であって外面１３および中心面１６の中央に位置する円弧面１７上に位置している。また、凸曲面１１ａの半径ｒａは、外面１３と中心面１６の離隔距離ｄ（＝セグメント厚さ寸法Ｄの１／２）と等しくなっている。 The convex curved surface 11a is a curved surface that is convex toward the other adjacent segment 1, and is formed on the outer surface 13 side of the center surface 16 in this embodiment. Convex surface 11a of the present embodiment is a circular arc surface, the center P a of the arcuate surface is a circular arc surface of the center plane 16 concentric on arcuate surface 17 located in the center of the outer surface 13 and central plane 16 positioned. Further, the radius r a of the convex curved surface 11a is equal to the (1/2 of = segment thickness D) distance d of the outer surface 13 and the central surface 16.

凹曲面１１ｂは、隣接する他のセグメント１側に凹な曲面であり、本実施形態では、中心面１６よりも内面１４側に形成されている。本実施形態の凹曲面１１ｂは、円弧面であり、この円弧面の中心Ｐｂは、中心面１６と同心の円弧面であって内面１４および中心面１６の中央に位置する円弧面１８上に位置している。また、凹曲面１１ｂの半径ｒｂは、外面１３と中心面１６の離隔距離ｄ（＝セグメント厚さ寸法Ｄの１／２）と等しくなっている。つまり、凹曲面１１ｂの半径ｒｂは、凸曲面１１ａの半径ｒａと同一である。 The concave curved surface 11b is a curved surface that is concave on the other adjacent segment 1 side, and is formed closer to the inner surface 14 side than the central surface 16 in this embodiment. Concave surface 11b of the present embodiment is a circular arc surface, the center P b of the arcuate surface is a circular arc surface of the center plane 16 concentric on arcuate surface 18 located in the center of the inner surface 14 and central plane 16 positioned. Further, the radius r b of the concave surface 11b is equal to the (1/2 of = segment thickness D) distance d of the outer surface 13 and the central surface 16. In other words, the radius r b of the concave surface 11b is the same as the radius r a of the convex curved surface 11a.

本実施形態においては、凸曲面１１ａおよび凹曲面１１ｂが連続して形成されていて、凸曲面１１ａおよび凹曲面１１ｂの境界（すなわち、第一継手面１１の変極点）Ｓにおける凸曲面１１ａの接線（接触平面）Ｔａと凹曲面１１ｂの接線（接触平面）Ｔｂが一致している。つまり、凸曲面１１ａおよび凹曲面１１ｂは、滑らかに連なっている。なお、凸曲面１１ａと凹曲面１１ｂの境界Ｓは、本実施形態では、中心面１６上に位置している。 In the present embodiment, the convex curved surface 11a and the concave curved surface 11b are continuously formed, and the tangent line of the convex curved surface 11a at the boundary (that is, the inflection point of the first joint surface 11) S between the convex curved surface 11a and the concave curved surface 11b. (the contact plane) T a and the concave surface 11b of the tangential (the contact plane) T b match. That is, the convex curved surface 11a and the concave curved surface 11b are smoothly connected. In addition, the boundary S of the convex curved surface 11a and the concave curved surface 11b is located on the center surface 16 in this embodiment.

第二継手面１２は、図３の（ｃ）に示すように、隣接する他のセグメント１の第一継手面１１に突き合わされる部位であり、凸曲面１２ａと凹曲面１２ｂとによって断面Ｓ字状に成形されている。なお、第二継手面１２の断面形状も、セグメント幅方向に一様である。   As shown in FIG. 3C, the second joint surface 12 is a portion that is abutted against the first joint surface 11 of another adjacent segment 1, and has a S-shaped cross section by the convex curved surface 12a and the concave curved surface 12b. It is shaped into a shape. The cross-sectional shape of the second joint surface 12 is also uniform in the segment width direction.

凸曲面１２ａは、隣接する他のセグメント１の凹曲面１１ｂに突き合わされる部位であり、第一継手面１１の凸曲面１１ａとは反対に、中心面１６よりも内面１４側に形成されているが、凸曲面１２ａの形状は、第一継手面１１の凸曲面１１ａと同一である。つまり、凸曲面１２ａの半径ｒａ´は、第一継手面１１の凸曲面１１ａの半径ｒａ（図３の（ｂ）参照）と同一であり、さらには、第一継手面１１の凹曲面１１ｂの半径ｒｂ（図３の（ｂ）参照）と同一である。 The convex curved surface 12 a is a portion that is abutted against the concave curved surface 11 b of another adjacent segment 1, and is formed on the inner surface 14 side of the center surface 16, opposite to the convex curved surface 11 a of the first joint surface 11. However, the shape of the convex curved surface 12 a is the same as the convex curved surface 11 a of the first joint surface 11. In other words, the radius r a 'is a convex curved surface 12a, is the same as the radius r a of the convex surface 11a of the first coupling surface 11 (see FIG. 3 (b)), further, the concave surface of the first coupling surface 11 It is the same as the radius r b of 11b (see (b) of FIG. 3).

凹曲面１２ｂは、隣接する他のセグメント１の凸曲面１１ａに突き合わされる部位であり、第一継手面１１の凹曲面１１ｂとは反対に、中心面１６よりも外面１３側に形成されているが、凹曲面１２ｂの形状は、第一継手面１１の凹曲面１１ｂと同一である。つまり、凹曲面１２ｂの半径ｒｂ´は、第一継手面１１の凹曲面１１ａの半径ｒｂ（図３の（ｂ）参照）と同一であり、さらには、第一継手面１１の凸曲面１１ａの半径ｒａ（図３の（ｂ）参照）と同一である。 The concave curved surface 12b is a portion that is abutted against the convex curved surface 11a of another adjacent segment 1, and is formed on the outer surface 13 side of the center surface 16 opposite to the concave curved surface 11b of the first joint surface 11. However, the shape of the concave curved surface 12 b is the same as the concave curved surface 11 b of the first joint surface 11. In other words, the radius r b 'is the concave surface 12b, the radius r b of the concave curved surface 11a of the first coupling surface 11 is the same as ((b) see FIG. 3), and further, the convex surface of the first coupling surface 11 This is the same as the radius r a of 11a (see FIG. 3B).

なお、第一継手面１１の内面１４側の隅角部（凹曲面１１ｂの内面１４側の縁部）および第二継手面１２の外面１３側の隅角部（凹曲面１２ｂの外面１３側の縁部）は、曲面状に面取りされている。   In addition, the corner on the inner surface 14 side of the first joint surface 11 (the edge on the inner surface 14 side of the concave surface 11b) and the corner on the outer surface 13 side of the second joint surface 12 (the outer surface 13 side of the concave surface 12b). The edge) is chamfered into a curved surface.

次に、セグメント１，１の断面Ｓ字状の継手面１１，１２を突き合せることで形成されるプレキャスト部材の接合構造（以下、「接合構造」という。）を詳細に説明する。   Next, the joint structure (hereinafter referred to as “joint structure”) of the precast member formed by abutting the joint surfaces 11 and 12 having S-shaped cross sections of the segments 1 and 1 will be described in detail.

本実施形態に係る接合構造は、図４の（ａ）に示すように、一方のセグメント１の第一継手面１１に含まれる凸曲面１１ａおよび凹曲面１１ｂを、それぞれ他方のセグメント１の第二継手面１２に含まれる凹曲面１２ｂおよび凸曲面１２ａに突き合せることで形成される。   As shown in FIG. 4A, the joint structure according to the present embodiment includes a convex curved surface 11 a and a concave curved surface 11 b included in the first joint surface 11 of one segment 1, and the second of the other segment 1. It is formed by abutting the concave curved surface 12b and the convex curved surface 12a included in the joint surface 12.

本実施形態では、凸曲面１１ａ，１２ａおよび凹曲面１１ｂ，１２ｂが円弧面であり、かつ、一方のセグメント１の凸曲面１１ａの半径と当該凸曲面１１ａに突き合わされる他方のセグメント１の凹曲面１２ｂの半径とが同一で、一方のセグメント１の凹曲面１１ｂの半径と当該凹曲面１１ｂに突き合わされる他方のセグメント１の凸曲面１２ａの半径とが同一であることから、一方のセグメント１の第一継手面１１と他方のセグメント１の第二継手面１２とを突き合せると、一方のセグメント１の凸曲面１１ａと他方のセグメント１の凹曲面１２ｂとが面接触し、一方のセグメント１の凹曲面１１ｂと他方のセグメント１の凸曲面１２ａとを面接触することになる。   In the present embodiment, the convex curved surfaces 11a and 12a and the concave curved surfaces 11b and 12b are arcuate surfaces, and the radius of the convex curved surface 11a of one segment 1 and the concave curved surface of the other segment 1 that abuts against the convex curved surface 11a. Since the radius of 12b is the same, the radius of the concave curved surface 11b of one segment 1 is the same as the radius of the convex curved surface 12a of the other segment 1 butted against the concave curved surface 11b. When the first joint surface 11 and the second joint surface 12 of the other segment 1 are brought into contact with each other, the convex curved surface 11a of one segment 1 and the concave curved surface 12b of the other segment 1 are in surface contact with each other. The concave curved surface 11b and the convex curved surface 12a of the other segment 1 are brought into surface contact.

なお、本実施形態においては、第一継手面１１の内面１４側の隅角部および第二継手面１２の外面１３側の隅角部が面取りされていることから、一方のセグメント１の第一継手面１１と他方のセグメント１の第二継手面１２とを突き合せると、セグメント１，１の外面１３側および内面側１４のそれぞれに、セグメント幅方向に沿って断面略三角形状の目地（溝）１ａが形成されることになる。   In the present embodiment, the corner portion on the inner surface 14 side of the first joint surface 11 and the corner portion on the outer surface 13 side of the second joint surface 12 are chamfered. When the joint surface 11 and the second joint surface 12 of the other segment 1 are abutted, joints (grooves) having a substantially triangular cross section along the segment width direction are respectively provided on the outer surface 13 side and the inner surface side 14 of the segments 1 and 1. ) 1a is formed.

ちなみに、図１に示すセグメントリングＲを構築するには、複数のセグメント１，１，…を順次連設すればよいが、最後に組み付けるセグメント１については、トンネル軸方向（図１では紙面垂直方向）から挿入する必要がある。   Incidentally, in order to construct the segment ring R shown in FIG. 1, a plurality of segments 1, 1,... May be sequentially arranged, but the last assembled segment 1 is in the tunnel axis direction (in FIG. ) Need to be inserted.

以上のように構成された接合構造においては、セグメント１，１に対して図４の（ｂ）に示すようなモーメント（正曲げ）が作用する場合には、内面１４側に位置する凹曲面１１ｂと凸曲面１２ａとが互いに摺動回転しつつ、外面１３側に位置する凸曲面１１ａと凹曲面１２ｂとが離間し、図４の（ｃ）に示すようなモーメント（負曲げ）が作用する場合には、外面１３側に位置する凸曲面１１ａと凹曲面１２ｂとが互いに摺動回転しつつ、内面１４側に位置する凹曲面１１ｂと凸曲面１２ａとは離間する。つまり、本実施形態に係る接合構造によれば、正曲げの場合も負曲げの場合もセグメント１，１の突合部分における回転が許容されることになるので、従来のナックルジョイント式の接合構造と同様に、セグメント１に発生する曲げモーメントを小さくすることが可能となり、ひいては、セグメント１の小断面化を図ることが可能となる。また、本実施形態に係る接合構造によれば、セグメント１，１の角部同士が接触することがないので、正曲げの場合も負曲げの場合も突合部分が無理なく回転する。つまり、本実施形態に係る接合構造によれば、回転が制限されることがないので、従来のナックルジョイント式の接合構造よりも、ヒンジに近い構造となる。さらに、一方のセグメント１の凸曲面１１ａおよび凹曲面１１ｂを、他方のセグメント１の凹曲面１２ｂおよび凸曲面１２ａに突き合せているので、継手金物等を使用しなくとも、突合部分においてセグメント厚さ方向（内外方向）のせん断力を伝達することができる。なお、本実施形態に係る接合構造によれば、せん断力の作用方向に係らず、せん断力を伝達することができるが、とりわけ本実施形態においては、セグメント厚さ方向の中央に凸曲面１１ａ（１２ａ）と凹曲面１１ｂ（１２ｂ）の境界を設け、かつ、凸曲面１１ａ（１２ａ）と凹曲面１１ｂ（１２ｂ）の半径を等しくしているので、正のせん断力に対しても負のせん断力に対しても、同等の性能を有することとなる。   In the joint structure configured as described above, when a moment (positive bending) as shown in FIG. 4B acts on the segments 1 and 1, the concave curved surface 11b located on the inner surface 14 side. And the convex curved surface 12a slide and rotate with each other, the convex curved surface 11a located on the outer surface 13 side and the concave curved surface 12b are separated from each other, and a moment (negative bending) as shown in FIG. The convex curved surface 11a and the concave curved surface 12b positioned on the outer surface 13 side slide and rotate with each other, while the concave curved surface 11b and the convex curved surface 12a positioned on the inner surface 14 side are separated from each other. That is, according to the joint structure according to the present embodiment, since rotation at the abutting portion of the segments 1 and 1 is allowed both in the case of positive bending and negative bending, the conventional knuckle joint type joint structure and Similarly, the bending moment generated in the segment 1 can be reduced, and as a result, the segment 1 can be reduced in cross section. Moreover, according to the joining structure which concerns on this embodiment, since the corner | angular parts of the segments 1 and 1 do not contact, a butt | joint part rotates reasonably also in the case of positive bending and negative bending. That is, according to the joint structure according to the present embodiment, the rotation is not limited, so that the structure is closer to the hinge than the conventional knuckle joint type joint structure. Furthermore, since the convex curved surface 11a and the concave curved surface 11b of one segment 1 are abutted against the concave curved surface 12b and the convex curved surface 12a of the other segment 1, the segment thickness at the abutting portion can be obtained without using a fitting hardware or the like. Shear force in the direction (inside and outside) can be transmitted. In addition, according to the joining structure which concerns on this embodiment, although shear force can be transmitted irrespective of the acting direction of shear force, especially in this embodiment, the convex curved surface 11a ( 12a) and the concave curved surface 11b (12b) are provided, and the radius of the convex curved surface 11a (12a) and the concave curved surface 11b (12b) is equal. However, it will have equivalent performance.

また、本実施形態においては、図４の（ａ）に示すように、一方のセグメント１の凸曲面１１ａおよび凹曲面１１ｂを、それぞれ他方のセグメント１の凹曲面１２ｂおよび凸曲面１２ａに面接触させているので、継手面１１，１２の接触面積が増大することになる。継手面１１，１２の接触面積が増大すると、突合部分に発生する応力が広範囲に分散することになるので、突合部分にひび割れや欠け等が発生し難くなる。特に本実施形態では、継手面１１（１２）を凸曲面１１ａ（１２ａ）と凹曲面１１ｂ（１２ｂ）とで形成するとともに、凹曲面１１ｂ（１２ｂ）の縁部を曲面状に面取りすることで、継手面１１（１２）から鋭角な部位を無くしたので、組立が容易になるとともに、セグメント１にひび割れや欠け等が発生し難くなる。   In the present embodiment, as shown in FIG. 4A, the convex curved surface 11a and the concave curved surface 11b of one segment 1 are brought into surface contact with the concave curved surface 12b and the convex curved surface 12a of the other segment 1, respectively. Therefore, the contact area of the joint surfaces 11 and 12 increases. When the contact area of the joint surfaces 11 and 12 increases, the stress generated in the abutting portion is dispersed over a wide range, so that it is difficult for a crack or a chip to occur in the abutting portion. Particularly in the present embodiment, the joint surface 11 (12) is formed by the convex curved surface 11a (12a) and the concave curved surface 11b (12b), and the edge of the concave curved surface 11b (12b) is chamfered into a curved shape, Since an acute angle portion is eliminated from the joint surface 11 (12), assembly is facilitated, and cracks and chips are hardly generated in the segment 1.

なお、前記した継手面１１，１２の形態は、適宜変更しても差し支えない。
例えば、本実施形態では、凸曲面１１ａ，１２ａおよび凹曲面１１ｂ，１２ｂをそれぞれ円弧面とした場合を例示したが、これに限定されることはなく、図示は省略するが、楕円面や放物面にしても差し支えない。 Note that the form of the joint surfaces 11 and 12 described above may be changed as appropriate.
For example, in the present embodiment, the case where the convex curved surfaces 11a, 12a and the concave curved surfaces 11b, 12b are respectively arcuate surfaces is illustrated, but the present invention is not limited to this and is not illustrated, but an elliptical surface or a parabola is not illustrated. It doesn't matter if you face it.

また、本実施形態では、一方のセグメント１の凸曲面１１ａの半径と当該凸曲面１１ａに突き合わされる他方のセグメント１の凹曲面１２ｂの半径とを等しくするとともに、一方のセグメント１の凹曲面１１ｂの半径と当該凹曲面１１ｂに突き合わされる他方のセグメント１の凸曲面１２ａの半径とを等しくした場合を例示したが、これに限定されることはなく、図示は省略するが、一方のセグメント１の凸曲面１１ａの半径を、当該凸曲面１１ａに突き合わされる他方のセグメント１の凹曲面１２ｂの半径より小さくするとともに、一方のセグメント１の凹曲面１１ｂの半径を、当該凹曲面１１ｂに突き合わされる他方のセグメント１の凸曲面１２ａの半径より大きくしてもよい。   In the present embodiment, the radius of the convex curved surface 11a of one segment 1 is made equal to the radius of the concave curved surface 12b of the other segment 1 abutted against the convex curved surface 11a, and the concave curved surface 11b of one segment 1 is made. Although the case where the radius of the convex surface 12a of the other segment 1 abutted against the concave curved surface 11b is made equal is illustrated, the present invention is not limited to this. The radius of the convex curved surface 11a is made smaller than the radius of the concave curved surface 12b of the other segment 1 abutted against the convex curved surface 11a, and the radius of the concave curved surface 11b of the one segment 1 is abutted against the concave curved surface 11b. The radius of the convex surface 12a of the other segment 1 may be larger.

また、本実施形態では、継手面１１（１２）において凸曲面１１ａ（１２ａ）と凹曲面１１ｂ（１２ｂ）を連続させ、継手面１１（１２）の全部を曲面とした場合を例示したが、これに限定されることはなく、図５に示すように、継手面１１（１２）において、凸曲面１１ａ（１２ａ）と凹曲面１１ｂ（１２ｂ）との間に、平面１１ｃ（１２ｃ）を介在させても差し支えない。   Moreover, in this embodiment, although the convex curved surface 11a (12a) and the concave curved surface 11b (12b) were made continuous in the joint surface 11 (12), the case where all the joint surfaces 11 (12) were made into the curved surface was illustrated. As shown in FIG. 5, a plane 11c (12c) is interposed between the convex surface 11a (12a) and the concave surface 11b (12b) in the joint surface 11 (12). There is no problem.

なお、セグメントリングＲの周囲からの反力（地盤反力など）が期待できない場合や、セグメントリングＲの変形を抑制したい場合には、セグメントリングＲの周方向にプレストレス（軸圧縮力）を導入するとよい。プレストレスの導入方法に特に制限はないが、例えば、図６に示すように、セグメントリングＲの内周に沿って配置したＰＣ鋼材３１を緊張すればよい。この場合、ＰＣ鋼材３１は、各セグメント１の内面１４に設けたアイボルトなどのリング部材３２に挿通するとよい。この他、図示は省略するが、セグメントリングＲの外周に沿って配置したＰＣ鋼材を緊張することで、セグメントリングＲの周方向にプレストレスを導入してもよいし、セグメント１に埋設したシースにＰＣ鋼材を挿通し、このＰＣ鋼材を緊張することで、セグメントリングＲの周方向にプレストレスを導入してもよい。   If reaction force from the surroundings of the segment ring R (such as ground reaction force) cannot be expected, or if you want to suppress deformation of the segment ring R, apply prestress (axial compression force) in the circumferential direction of the segment ring R. It is good to introduce. Although the prestress introduction method is not particularly limited, for example, as shown in FIG. 6, the PC steel material 31 disposed along the inner periphery of the segment ring R may be tensioned. In this case, the PC steel material 31 may be inserted through a ring member 32 such as an eyebolt provided on the inner surface 14 of each segment 1. In addition, although illustration is omitted, prestress may be introduced in the circumferential direction of the segment ring R by tensioning the PC steel material arranged along the outer periphery of the segment ring R, or the sheath embedded in the segment 1 A prestress may be introduced in the circumferential direction of the segment ring R by inserting a PC steel material into the PC and tensioning the PC steel material.

セグメントリングＲを組み立てる際にセグメント１，１同士を仮接合する必要がある場合には、図７の（ａ）に示すように、斜めボルト４１を用いてセグメント１，１を連結するとよい。具体的には、図７の（ｂ）に示すように、一方のセグメント１の内面１４に設けた凹部４２から第一継手面１１に至る挿通孔４３に斜めボルト４１を挿通し、他方のセグメント１の第二継手面１２に設けた雌ネジ４４に螺合すればよい。なお、セグメントリングＲを閉合した後に、斜めボルト４１を撤去することが望ましいが、突合部分の回転を阻害しない場合には残置してもよい。   When it is necessary to temporarily join the segments 1 and 1 when assembling the segment ring R, the segments 1 and 1 may be connected using an oblique bolt 41 as shown in FIG. Specifically, as shown in FIG. 7B, an oblique bolt 41 is inserted into an insertion hole 43 extending from a recess 42 provided on the inner surface 14 of one segment 1 to the first joint surface 11, and the other segment What is necessary is just to screw in the internal thread 44 provided in the 1st 2nd joint surface 12. Although it is desirable to remove the diagonal bolt 41 after closing the segment ring R, it may be left if it does not hinder the rotation of the abutting portion.

また、前記した実施形態では、継手面１１，１２の断面形状をセグメント幅方向に一様としたが、これに限定されることはなく、図８に示す継手面１１´のように、セグメント幅方向の途中（図８ではセグメント幅方向の中央）で、凸曲面１１ａと凹曲面１１ｂの位置を逆転させてもよい。つまり、継手面１１´のうち、セグメント幅方向の一端から中央までは、中心面１６よりも外面１３側に凸曲面１１ａを配置するとともに、中心面１６よりも内面１４側に凹曲面１１ｂを配置し、セグメント幅方向の中央から他端までは、中心面１６よりも内面１４側に凸曲面１１ａ´を配置するとともに、中心面１６よりも外面１３側に凹曲面１１ｂ´を配置してもよい。なお、図示は省略するが、継手面１１´に突き合わされる他のセグメントの継手面においては、セグメント幅方向の一端から中央までは、中心面１６よりも外面１３側に凹曲面を配置するとともに、中心面１６よりも内面１４側に凸曲面を配置し、セグメント幅方向の中央から他端までは、中心面１６よりも内面１４側に凹曲面を配置するとともに、中心面１６よりも外面１３側に凸曲面を配置すればよい。このようにすると、隣接する二つのセグメント１，１の継手面同士を突き合わせた際に、セグメント幅方向の中央部が係合し、セグメント１，１のセグメント幅方向への相対移動が阻止されることになるので、これらの組付け精度が向上することになる。   In the above-described embodiment, the cross-sectional shape of the joint surfaces 11 and 12 is uniform in the segment width direction. However, the present invention is not limited to this, and the segment width as in the joint surface 11 ′ shown in FIG. In the middle of the direction (the center in the segment width direction in FIG. 8), the positions of the convex curved surface 11a and the concave curved surface 11b may be reversed. That is, in the joint surface 11 ′, the convex curved surface 11 a is disposed on the outer surface 13 side of the central surface 16 and the concave curved surface 11 b is disposed on the inner surface 14 side of the central surface 16 from one end to the center in the segment width direction. Then, from the center to the other end in the segment width direction, the convex curved surface 11 a ′ may be disposed on the inner surface 14 side of the central surface 16, and the concave curved surface 11 b ′ may be disposed on the outer surface 13 side of the central surface 16. . In addition, although illustration is abbreviate | omitted, while the concave surface is arrange | positioned in the outer surface 13 side rather than the center surface 16 from the one end of a segment width direction to the center in the joint surface of the other segment collided with joint surface 11 '. A convex curved surface is disposed on the inner surface 14 side of the central surface 16, and a concave curved surface is disposed on the inner surface 14 side of the central surface 16 from the center to the other end in the segment width direction, and the outer surface 13 of the central surface 16 is larger than the central surface 16. A convex curved surface may be arranged on the side. If it does in this way, when the joint surfaces of two adjacent segments 1 and 1 will face | match, the center part of a segment width direction will engage, and the relative movement to the segment width direction of the segments 1 and 1 will be blocked | prevented. As a result, the assembly accuracy is improved.

なお、前記した実施形態では、プレキャスト部材がシールドトンネル用のセグメント１である場合を例示したが、本発明に係るプレキャスト部材の用途等を限定する趣旨ではない。図示は省略するが、前記したセグメント１およびその接合構造と同様の構成を、トンネルの内空に設置される補修用の覆工、立坑、サイロなどの筒状の構造物を構成するプレキャスト部材（セグメントやライナー）およびその接合構造に適用することもできるし、２ヒンジ構造や３ヒンジ構造のアーチカルバートを構成するプレキャスト部材およびその接合構造に適用することもできる。   In the above-described embodiment, the case where the precast member is the segment 1 for the shield tunnel is illustrated, but it is not intended to limit the use or the like of the precast member according to the present invention. Although not shown in the drawings, the same structure as the above-described segment 1 and its joint structure is a precast member that forms a cylindrical structure such as a lining for repair, a shaft, a silo, etc. installed in the interior of the tunnel. It can also be applied to a segment or a liner) and a joining structure thereof, and can also be applied to a precast member constituting an arch culvert of a two-hinge structure or a three-hinge structure and a joining structure thereof.

また、前記した実施形態では、円筒を複数個に等分割した形態のプレキャスト部材（セグメント１）を例示したが、プレキャスト部材の形態を限定する趣旨ではない。断面楕円状のリングを複数個に分割した形態のプレキャスト部材や平板状を呈するプレキャスト部材であっても、断面Ｓ字状を呈する継手面同士を突き合せることで、前記した実施形態のものと同様の作用効果を奏する接合構造を得ることができる。   In the above-described embodiment, the precast member (segment 1) in which the cylinder is equally divided into a plurality of parts is illustrated, but the form of the precast member is not limited. Even in the case of a precast member having a shape in which a ring having an elliptical cross section is divided into a plurality of shapes or a precast member having a flat plate shape, the joint surfaces having an S-shaped cross section are brought into contact with each other, so that they are the same as those in the above-described embodiment. It is possible to obtain a joint structure that exhibits the above effects.

本発明の実施形態に係るプレキャスト部材を具備する構造物を示す正面図である。It is a front view which shows the structure which comprises the precast member which concerns on embodiment of this invention. 本発明の実施形態に係るプレキャスト部材を示す斜視図である。It is a perspective view which shows the precast member which concerns on embodiment of this invention. （ａ）は本発明の実施形態に係るプレキャスト部材を示す正面図、（ｂ）は（ａ）のＢ部拡大図、（ｃ）は（ａ）のＣ部拡大図である。(A) is a front view which shows the precast member which concerns on embodiment of this invention, (b) is the B section enlarged view of (a), (c) is the C section enlarged view of (a). 本発明の実施形態に係るプレキャスト部材の接合構造を説明するための拡大正面図であって、（ａ）は継手面同士を突き合わせた状態を示す図、（ｂ）および（ｃ）は突合部分が回転した状態を示す模式図である。BRIEF DESCRIPTION OF THE DRAWINGS It is an enlarged front view for demonstrating the joining structure of the precast member which concerns on embodiment of this invention, Comprising: (a) is a figure which shows the state which faced joint surfaces, (b) and (c) are butt | matching parts. It is a schematic diagram which shows the state which rotated. 継手面の変形例を示す拡大正面図である。It is an enlarged front view which shows the modification of a joint surface. プレキャスト部材間にプレストレスを導入する方法を説明するための模式的な正面図である。It is a typical front view for demonstrating the method of introduce | transducing prestress between precast members. （ａ）はプレキャスト部材同士を仮接合する方法を説明するための模式的な拡大断面図、（ｂ）は（ａ）の分解図である。(A) is a typical expanded sectional view for demonstrating the method of temporarily joining precast members, (b) is an exploded view of (a). 継手面の他の変形例を説明するための斜視図である。It is a perspective view for demonstrating the other modification of a joint surface.

符号の説明Explanation of symbols

１ セグメント（プレキャスト部材）
１１，１２ 継手面
１１ａ，１２ａ 凸曲面
１１ｂ，１２ｂ 凹曲面 1 segment (precast material)
11, 12 Joint surface 11a, 12a Convex surface 11b, 12b Concave surface

Claims (6)

隣接する二つのプレキャスト部材の継手面同士を突き合せることで形成されるプレキャスト部材の接合構造であって、
前記継手面が、凸曲面と凹曲面とによって断面Ｓ字状に成形されており、
一方の前記プレキャスト部材の前記凸曲面および前記凹曲面が、それぞれ他方の前記プレキャスト部材の前記凹曲面および前記凸曲面に突き合されていることを特徴とするプレキャスト部材の接合構造。 A joint structure of precast members formed by abutting joint surfaces of two adjacent precast members,
The joint surface is formed into a S-shaped cross section by a convex curved surface and a concave curved surface,
The joint structure of precast members, wherein the convex curved surface and the concave curved surface of one of the precast members are abutted against the concave curved surface and the convex curved surface of the other precast member, respectively. 一方の前記プレキャスト部材の前記継手面および他方の前記プレキャスト部材の前記継手面のそれぞれにおいて、前記凸曲面および前記凹曲面を連続させ、前記凸曲面と前記凹曲面の境界における前記凸曲面の接線および前記凹曲面の接線を一致させたことを特徴とする請求項１に記載のプレキャスト部材の接合構造。   In each of the joint surface of one of the precast members and the joint surface of the other precast member, the convex curved surface and the concave curved surface are continuous, and the tangent line of the convex curved surface at the boundary between the convex curved surface and the concave curved surface; The joint structure of the precast member according to claim 1, wherein tangents of the concave curved surface are matched. 前記凸曲面および前記凹曲面が、それぞれ円弧面であり、
一方の前記プレキャスト部材の前記凸曲面および前記凹曲面が、それぞれ他方の前記プレキャスト部材の前記凹曲面および前記凸曲面に面接触することを特徴とする請求項１または請求項２に記載のプレキャスト部材の接合構造。 The convex curved surface and the concave curved surface are arcuate surfaces, respectively.
The precast member according to claim 1, wherein the convex curved surface and the concave curved surface of one of the precast members are in surface contact with the concave curved surface and the convex curved surface of the other precast member, respectively. Bonding structure. 他方の前記プレキャスト部材の前記凹曲面の半径が、一方の前記プレキャスト部材の前記凸曲面の半径と同一であり、
他方の前記プレキャスト部材の前記凸曲面の半径が、一方の前記プレキャスト部材の前記凹曲面の半径と同一であることを特徴とする請求項３に記載のプレキャスト部材の接合構造。 The radius of the concave surface of the other precast member is the same as the radius of the convex surface of the one precast member;
The joint structure of the precast member according to claim 3, wherein a radius of the convex curved surface of the other precast member is the same as a radius of the concave curved surface of the one precast member. 前記凸曲面の半径および前記凹曲面の半径が、それぞれ前記プレキャスト部材の厚さ寸法の１／２と等しいことを特徴とする請求項３に記載のプレキャスト部材の接合構造。   4. The precast member joining structure according to claim 3, wherein a radius of the convex curved surface and a radius of the concave curved surface are each equal to ½ of a thickness dimension of the precast member. コンクリート構造物を構成するプレキャスト部材であって、
隣接する他のプレキャスト部材に突き合わされる継手面が、凸曲面と凹曲面とによって断面Ｓ字状に成形されていることを特徴とするプレキャスト部材。 A precast member constituting a concrete structure,
A precast member characterized in that a joint surface to be abutted against another adjacent precast member is formed into a S-shaped cross section by a convex curved surface and a concave curved surface.
JP2006334194A 2006-12-12 2006-12-12 Precast member joining structure and precast member Expired - Fee Related JP4839197B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63165398A (en) * 1986-12-15 1988-07-08 サンド・アクチエンゲゼルシャフト Novel furanolonic acid derivative its production and use
JPH06307197A (en) * 1993-04-21 1994-11-01 Ishikawajima Constr Materials Co Ltd Joint construction of segment
JPH07238790A (en) * 1994-03-02 1995-09-12 Nippon Telegr & Teleph Corp <Ntt> Joint structure of shield segment
JP2001012188A (en) * 1999-06-30 2001-01-16 Geostr Corp Joint structure for hollow structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63165398A (en) * 1986-12-15 1988-07-08 サンド・アクチエンゲゼルシャフト Novel furanolonic acid derivative its production and use
JPH06307197A (en) * 1993-04-21 1994-11-01 Ishikawajima Constr Materials Co Ltd Joint construction of segment
JPH07238790A (en) * 1994-03-02 1995-09-12 Nippon Telegr & Teleph Corp <Ntt> Joint structure of shield segment
JP2001012188A (en) * 1999-06-30 2001-01-16 Geostr Corp Joint structure for hollow structure

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