JP5538965B2

JP5538965B2 - Shield machine for spiral tunnel excavation

Info

Publication number: JP5538965B2
Application number: JP2010061726A
Authority: JP
Inventors: 忠原; 高志久原; 裕悟林; 泰治花岡
Original assignee: Hitachi Zosen Corp; Shimizu Corp
Current assignee: Hitachi Zosen Corp; Shimizu Corp
Priority date: 2010-03-18
Filing date: 2010-03-18
Publication date: 2014-07-02
Anticipated expiration: 2030-03-18
Also published as: JP2011196033A

Description

本発明は、矩形断面や長円形断面、まゆ形断面などの非円形断面の螺旋トンネルを掘削するためのシールド掘進機に関する。 The present invention relates to a shield machine for excavating a spiral tunnel having a non-circular cross section such as a rectangular cross section, an oval cross section, or an eyebrows cross section.

たとえば地下大空間の周壁や地下道路の立体ジャンクションを形成するために、螺旋トンネルを掘削することがある。このような場合、従来では、図１９（ａ）に示すように、前胴１と後胴２とを球面継手を介して屈曲中心３を中心に屈曲自在に連結した掘削機本体４を使用している。しかし、上記構成では、曲率が小さくなるほど大きい断面を余掘りしなければならなくなり、特に密閉形の場合には余掘り量に制約を受けること、余掘り後の注入剤の使用が増大すること、急勾配の螺旋トンネルの場合の施工工期が長くなることなどの問題点がある。これらの問題点を解消するものとして提案された特許文献１の掘削機本体７は、図１９（ｂ）に示すように、前胴５と後胴６とを螺旋トンネルの曲率と同一の円弧状に形成している。これにより、余掘りをなくすことができ、余掘りによる注入剤の削減や地盤沈下を防止することができる。 For example, a spiral tunnel may be drilled to form a peripheral wall of a large underground space or a three-dimensional junction of an underground road. In such a case, conventionally, as shown in FIG. 19A, an excavator main body 4 in which a front cylinder 1 and a rear cylinder 2 are connected to each other with a bendable center 3 through a spherical joint so as to be freely bent is used. ing. However, in the above configuration, the larger the cross section has to be dug down as the curvature becomes smaller, especially in the case of a sealed type, the amount of dug up is restricted, the use of the injecting agent after dug up increases, There are problems such as a long construction period in the case of a steep spiral tunnel. As shown in FIG. 19 (b), the excavator body 7 of Patent Document 1 proposed to solve these problems has an arcuate shape in which the front cylinder 5 and the rear cylinder 6 have the same curvature as that of the spiral tunnel. Is formed. As a result, it is possible to eliminate excessive digging, and it is possible to reduce the amount of infusate and subsidence due to excessive digging.

ところで、特許文献１は円形断面トンネルを掘削するものであるが、トンネル内に道路などを設置する場合、円形断面では、使用面積に対する掘削面積が広く、使用効率が低いために、矩形断面やまゆ形断面、長円形断面、釣鐘形断面などの非円形断面が数多く提案されている。 By the way, Patent Document 1 excavates a circular cross-section tunnel. However, when a road or the like is installed in the tunnel, the circular cross-section has a large excavation area with respect to the use area and low use efficiency. Many non-circular cross sections such as a cross section, an oval cross section and a bell-shaped cross section have been proposed.

特開平３−１７６５９２Japanese Patent Laid-Open No. 3-17692

螺旋トンネルを非円形断面で掘削する場合、セグメントは常に正立姿勢、たとえば矩形断面の場合には、上下面が水平で、内外周面が鉛直となるように、組み立てる必要がある。図１９（ｂ）に示す円弧状の掘削機本体８を使用して、螺旋トンネルを掘削する場合のトンネルの傾きについて、図１９（ｃ）を参照して説明する。 When excavating a spiral tunnel with a non-circular cross section, the segments must always be assembled in an upright position, for example, a rectangular cross section, so that the top and bottom surfaces are horizontal and the inner and outer peripheral surfaces are vertical. The inclination of the tunnel when excavating a spiral tunnel using the arc-shaped excavator body 8 shown in FIG. 19 (b) will be described with reference to FIG. 19 (c).

まず、図１９（ｃ６〜ｃ８）は、上記従来の円弧状の掘削機本体８を水平に配置した中心軸心上の平面視の断面を示す円弧面ＣＰである。この円弧面ＣＰを、螺旋半径に沿う後端辺を中心に勾配αだけ前部上方に傾斜させると、図１９（ｃ３〜ｃ５）に示す傾斜姿勢となる。一方、傾斜姿勢の円弧面ＣＰと同じ占有角θで同じ勾配αの螺旋面ＳＰは、図１９（ｃ１，ｃ２）に示すとおりである。 First, FIG. 19 (c6 to c8) is a circular arc surface CP showing a cross section in a plan view on the central axis in which the conventional arc-shaped excavator body 8 is horizontally arranged. When the circular arc surface CP is inclined upward by a gradient α around the rear end side along the spiral radius, the inclined posture shown in FIG. 19 (c3 to c5) is obtained. On the other hand, the spiral surface SP having the same occupying angle θ and the same gradient α as the inclined circular arc surface CP is as shown in FIG. 19 (c1, c2).

前記傾斜円弧面ＣＰと螺旋面ＳＰとを比較すると、後端辺はそれぞれ水平であるが、螺旋面ＳＰの前端辺が水平であるのに対して、円弧面ＣＰの前端辺がＢ−Ｂ矢視でβだけ内周側下方に傾斜され、捻り角βが生じている点で相違している。 When the inclined arc surface CP and the spiral surface SP are compared, the rear end sides are horizontal, but the front end side of the spiral surface SP is horizontal, whereas the front end side of the arc surface CP is the BB arrow. It is different in that it is tilted downward by β on the inner peripheral side and a twist angle β is generated.

したがって、図１９（ｄ）に示すように、円弧状の掘削機本体４を、勾配分θだけ前部上方に傾斜させて、螺旋経路上をたとえば左のカーブに沿って掘進させても、一点鎖線で示す正立姿勢の螺旋トンネルＴｓに対して、前端部では捻り角βだけ掘進方向に向かって反時計方向に捻れた実線の傾斜円弧トンネルＴｃしか掘削することができず、掘進するに従って反時計方向に捻れたトンネルが形成されて、螺旋トンネルをスムーズに掘削できないという問題があった。 Accordingly, as shown in FIG. 19 (d), even if the arc-shaped excavator body 4 is tilted forward by the gradient θ and is excavated on the spiral path along the left curve, for example, In contrast to the spiral tunnel Ts in the upright position shown by the chain line, only the solid-line inclined arc tunnel Tc twisted in the counterclockwise direction toward the digging direction can be excavated at the front end portion, and as the digging proceeds, There was a problem that the tunnel twisted in the clockwise direction was formed and the spiral tunnel could not be excavated smoothly.

本発明は上記問題点を解決して、非円形断面のトンネルを正立姿勢で螺旋経路に沿って容易に掘進できるとともに、製作も容易で低コストで提供できる螺旋トンネル掘削用シールド掘進機を提供することを目的とする。 The present invention solves the above problems and provides a shield tunneling machine for spiral tunnel excavation that can easily dig a tunnel with a non-circular cross section along a spiral path in an upright posture and that can be easily manufactured and provided at low cost. The purpose is to do.

請求項１記載の発明は、
螺旋軸を中心として所定の勾配の螺旋経路に沿って、非円形断面の螺旋トンネルを掘削する螺旋トンネル掘削用シールド掘進機であって、
前部に掘削装置を有し、後部に螺旋トンネルに沿って覆工体を組み立てるエレクタ装置を有するシールド本体を、螺旋軸を中心とする円弧状に形成するとともに、前後に複数に分割された複数の胴部により構成し、
互いに隣接される後方の胴部に対して前方の胴部を、掘進方向に向かって左右一方に旋回して螺旋トンネルを掘削する場合に、左右他方に所定の捻り角で捻って連結固定し、
螺旋軸を中心とする螺旋トンネルの占有角：θ（rad）、螺旋トンネルのリード角：α（rad）として所定半径の螺旋トンネルを掘削する時に、
前記捻り角：β（rad）を、β＝tan ^-1 （θ×tanα）とすることにより、前端の胴部の前端面と後端の胴部の後端面とをそれぞれ螺旋経路上の螺旋トンネル断面に略合致させるものである。
請求項２記載の発明は、
螺旋軸を中心として所定の勾配の螺旋経路に沿って、非円形断面の螺旋トンネルを掘削する螺旋トンネル掘削用シールド掘進機であって、
前部に掘削装置を有し、後部に螺旋トンネルに沿って覆工体を組み立てるエレクタ装置を有するシールド本体を、前後に複数に分割された複数の胴部により構成するとともに、当該各胴部を、螺旋トンネルに内接するように中間部で折り曲げられた複数の直状断面の分割胴部により形成し、
互いに隣接される後方の胴部に対して前方の胴部を、掘進方向に向かって左右一方に旋回して螺旋トンネルを掘削する場合に、左右他方に所定の捻り角で捻って連結固定し、
螺旋軸を中心とする螺旋トンネルの占有角：θ（rad）、螺旋トンネルのリード角：α（rad）として所定半径の螺旋トンネルを掘削する時に、
前記捻り角：β（rad）を、β＝tan ^-1 （θ×tanα）とすることにより、
前端の胴部の前端面と後端の胴部の後端面とをそれぞれ螺旋経路上の螺旋トンネル断面に略合致させるものである。 The invention described in claim 1
A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector that assembles the lining body along the spiral tunnel at the rear is formed into an arc shape with the spiral axis as the center, and a plurality divided in front and rear. Composed of the body of
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
When excavating a spiral tunnel of a predetermined radius with an occupation angle of the spiral tunnel around the spiral axis: θ (rad) and a lead angle of the spiral tunnel: α (rad),
By setting the twist angle: β (rad) to β = tan ⁻¹ (θ × tan α), the front end surface of the front end barrel portion and the rear end surface of the rear end barrel portion are respectively spiral tunnels on the spiral path. It substantially matches the cross section.
The invention according to claim 2
A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector device for assembling the lining body along the spiral tunnel at the rear is composed of a plurality of trunks divided into a plurality of front and rear parts, and , Formed by a plurality of straight section split barrels bent at the middle so as to be inscribed in the spiral tunnel,
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
When excavating a spiral tunnel of a predetermined radius with an occupation angle of the spiral tunnel around the spiral axis: θ (rad) and a lead angle of the spiral tunnel: α (rad),
By setting the twist angle: β (rad) to β = tan ⁻¹ (θ × tan α),
The front end face of the front end barrel portion and the rear end face of the rear end barrel portion are substantially matched to the cross section of the spiral tunnel on the spiral path.

請求項３記載の発明は、
螺旋軸を中心として所定の勾配の螺旋経路に沿って、非円形断面の螺旋トンネルを掘削する螺旋トンネル掘削用シールド掘進機であって、
前部に掘削装置を有し、後部に螺旋トンネルに沿って覆工体を組み立てるエレクタ装置を有するシールド本体を、螺旋軸を中心とする円弧状に形成するとともに、前後に３個以上に分割された複数の胴部により構成し、
互いに隣接される後方の胴部に対して前方の胴部を、掘進方向に向かって左右一方に旋回して螺旋トンネルを掘削する場合に、左右他方に所定の捻り角で捻って連結固定し、
前記捻り角は、連結部の前後の胴部の合計の周長または螺旋軸を中心とする占有角の比率により設定され、ここで周長は、端部の胴部は全周長、中間の胴部は周長の１／２、また占有角は、端部の胴部は全占有角、中間の胴部は占有角の１／２とすることにより、前端の胴部の前端面と後端の胴部の後端面とをそれぞれ螺旋経路上の螺旋トンネル断面に略合致させるものである。
請求項４記載の発明は、
螺旋軸を中心として所定の勾配の螺旋経路に沿って、非円形断面の螺旋トンネルを掘削する螺旋トンネル掘削用シールド掘進機であって、
前部に掘削装置を有し、後部に螺旋トンネルに沿って覆工体を組み立てるエレクタ装置を有するシールド本体を、前後に複数に分割された複数の胴部により構成するとともに、当該各胴部を、螺旋トンネルに内接するように中間部で折り曲げられて前後に３個以上に分割された複数の直状断面の分割胴部により形成し、
互いに隣接される後方の胴部に対して前方の胴部を、掘進方向に向かって左右一方に旋回して螺旋トンネルを掘削する場合に、左右他方に所定の捻り角で捻って連結固定し、
前記捻り角は、連結部の前後の胴部の合計の周長または螺旋軸を中心とする占有角の比率により設定され、ここで周長は、端部の胴部は全周長、中間の胴部は周長の１／２、また占有角は、端部の胴部は全占有角、中間の胴部は占有角の１／２とすることにより、前端の胴部の前端面と後端の胴部の後端面とをそれぞれ螺旋経路上の螺旋トンネル断面に略合致させるものである。 The invention described in claim 3
A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector that assembles the lining body along the spiral tunnel at the rear is formed in an arc shape centered on the spiral axis, and is divided into three or more parts in the front and rear. multiple constituted by cylinder portions,
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
The torsion angle is set by the total circumference of the body parts before and after the connecting part or the ratio of the occupied angle around the spiral axis, where the circumference is the entire circumference of the body part at the end, The front of the front end of the front end and the rear end of the front end The rear end surface of the end barrel is approximately matched with the cross section of the spiral tunnel on the spiral path.
The invention according to claim 4
A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector device for assembling the lining body along the spiral tunnel at the rear is composed of a plurality of trunks divided into a plurality of front and rear parts, and , Formed by a plurality of straight section divided body parts that are bent at the middle part so as to be inscribed in the spiral tunnel and divided into three or more in the front and rear ,
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
The torsion angle is set by the total circumference of the body parts before and after the connecting part or the ratio of the occupied angle around the spiral axis, where the circumference is the entire circumference of the body part at the end, The front of the front end of the front end and the rear end of the front end The rear end surface of the end barrel is approximately matched with the cross section of the spiral tunnel on the spiral path.

請求項５記載の発明は、請求項１乃至４のいずれかに記載の構成において、
連結部に、前側胴部の連結端面と後側胴部の連結端面との合致部分からはみ出す胴部拡張部が形成され、
前側胴部と後側胴部の連結部側の外面に、前記胴部拡張部を削除する削除面部および前記胴部拡張部に連続する増径面部の少なくとも一方を設けたものである。 The invention according to claim 5 is the configuration according to any one of claims 1 to 4 ,
The connecting portion is formed with a body extension portion that protrudes from a matching portion between the connecting end surface of the front body portion and the connecting end surface of the rear body portion,
At least one of a deletion surface portion for deleting the body portion expansion portion and a diameter increasing surface portion continuous with the body portion expansion portion is provided on the outer surface of the front body portion and the rear body portion on the connecting portion side.

請求項１記載の発明によれば、非円形断面のシールド本体を、螺旋軸を中心とする螺旋半径に沿った円弧状に形成するとともに、シールド本体を構成する胴部の連結部で、後側胴部に対して前側胴部を、掘進方向に向かって左方向に旋回して螺旋トンネルを掘削する場合は、右方向（時計方向）に所定の捻り角［螺旋軸を中心とする螺旋トンネルの占有角：θ（rad）、螺旋トンネルのリード角：α（rad）とした時に、前記捻り角：β（rad）＝tan ^-1 （θ×tanα）］だけ捻り、掘進方向に向かって右方向に旋回して螺旋トンネルを掘削する場合は、左方向（反時計方向）に所定の捻り角［螺旋軸を中心とする螺旋トンネルの占有角：θ（rad）、螺旋トンネルのリード角：α（rad）とした時に、前記捻り角：β（rad）＝tan ^-1 （θ×tanα）］だけ捻って連結固定することにより、シールド本体の前端面と後端面とを螺旋経路上のトンネル断面に略合致させる。これにより、前部で掘削した螺旋トンネル断面を後方の胴部が通過する時に、シールド本体をローリングさせる捻り力を付与することができ、前端面と後端面の捻れの位相差により、シールド本体を旋回させつつ螺旋トンネルを掘進することができ、余掘り量を少なくして、非円形断面の螺旋トンネルをスムーズに掘削することができる。またシールド本体自体を捻った立体形状にすることなく、円弧状に形成した胴部を捻って連結するだけでよいので、低コストで製作でき、さらに捻り角を変更することにより、勾配の異なる螺旋トンネルの掘削にも適用することができ、汎用性を拡大することができる。 According to the first aspect of the present invention, the shield body having a non-circular cross section is formed in an arc shape along the spiral radius with the spiral axis as the center, and at the connecting portion of the trunk portion constituting the shield body, When excavating a spiral tunnel by turning the front trunk to the left in the direction of excavation and excavating the spiral tunnel with respect to the trunk, a predetermined twist angle [clockwise of the spiral tunnel centered on the spiral axis] When the occupying angle is θ (rad) and the lead angle of the spiral tunnel is α (rad), the twist angle is β (rad) = tan ⁻¹ (θ × tan α)] , and the right direction toward the excavation direction When excavating the spiral tunnel by turning to the left, a predetermined twist angle [ occupied angle of the spiral tunnel centered on the spiral axis: θ (rad), lead angle of the spiral tunnel: α ( when a rad), the torsion ^{angle: β (rad) = tan -1} (θ × tanα)] only twisted by linking By constant, thereby substantially matching the front surface and the rear end face of the shield body in the tunnel cross-section of the helical path. As a result, when the rear trunk passes through the spiral tunnel cross section excavated at the front, a twisting force for rolling the shield main body can be applied, and the shield main body is caused by the phase difference of the twist between the front end face and the rear end face. The spiral tunnel can be excavated while turning, and the amount of surplus digging can be reduced to smoothly excavate the spiral tunnel having a non-circular cross section. In addition, it is only necessary to twist and connect the body formed in an arc shape without twisting the shield body itself, so that it can be manufactured at low cost, and by changing the twist angle, spirals with different gradients can be produced. It can be applied to tunnel excavation, and versatility can be expanded.

請求項２記載の発明によれば、非円形断面のシールド本体を構成する各胴部を、螺旋軸を中心とする螺旋トンネルに内接する折り曲げ形状に形成するとともに、シールド本体を構成する胴部の連結部で、後側胴部に対して前側胴部を、掘進方向に向かって左方向に旋回して螺旋トンネルを掘削する場合は、右方向（時計方向）に所定の捻り角［螺旋軸を中心とする螺旋トンネルの占有角：θ（rad）、螺旋トンネルのリード角：α（rad）とした時に、前記捻り角：β（rad）＝tan ^-1 （θ×tanα）］だけ捻り、掘進方向に向かって右方向に旋回して螺旋トンネルを掘削する場合は、左方向（反時計方向）に所定の捻り角［螺旋軸を中心とする螺旋トンネルの占有角：θ（rad）、螺旋トンネルのリード角：α（rad）とした時に、前記捻り角：β（rad）＝tan ^-1 （θ×tanα）］だけ捻って連結固定することにより、シールド本体の前端面と後端面とを螺旋経路上のトンネル断面に略合致させる。これにより、前端面で掘削した螺旋トンネル断面を後方の胴部が通過する時に、シールド本体をローリングさせる捻り力を付与することができ、前端面と後端面の捻れの位相差により、シールド本体を旋回させつつ螺旋トンネルを掘進することができ、余掘り量を少なくして、非円形断面の螺旋トンネルをスムーズに掘削することができる。また各胴部を円弧形状にすることなく、直状断面の分割胴部を折り曲げて形成するとともに、前後の胴部を捻って連結してシールド本体を形成するだけでよく、容易に短期間で製作でき、製作コストを削減することができる。さらに捻り角や折り曲げ角を変更することにより、勾配や半径の異なる螺旋トンネルの掘削にも適用することができ、汎用性を拡大することができる。 According to invention of Claim 2, while forming each trunk | drum which comprises the shield main body of a non-circular cross section in the bending shape inscribed in the spiral tunnel centering on a helical axis, at the junction, the front body portion relative to the rear body part, if turning to the left direction in the excavation direction drilling helical tunnel, predetermined twist angle in the right direction (clockwise) [helix axis Twisting by the twist angle: β (rad) = tan ⁻¹ (θ × tanα)] when the occupation angle of the spiral tunnel as the center is θ (rad) and the lead angle of the spiral tunnel is α (rad) When excavating a spiral tunnel by turning to the right toward the direction, a predetermined twist angle in the left direction (counterclockwise direction) [ occupied angle of the spiral tunnel around the spiral axis: θ (rad), spiral tunnel When the lead angle is α (rad), the twist angle: β (rad) = tan ⁻¹ By twisting and fixing (θ × tan α)] , the front end surface and the rear end surface of the shield body are substantially matched to the tunnel cross section on the spiral path. As a result, a twisting force that rolls the shield body can be applied when the rear trunk passes through the cross section of the spiral tunnel excavated on the front end face, and the shield body is moved by the phase difference between the twists of the front end face and the rear end face. The spiral tunnel can be excavated while turning, and the amount of surplus digging can be reduced to smoothly excavate the spiral tunnel having a non-circular cross section. Moreover, it is only necessary to form the shield main body by twisting and connecting the front and rear body portions while forming the shield body without bending each body portion in an arc shape, and by bending the front and rear body portions. It can be manufactured and the manufacturing cost can be reduced. Furthermore, by changing the twist angle and the bending angle, it can be applied to excavation of a spiral tunnel having different gradients and radii, and versatility can be expanded.

請求項３記載の発明によれば、請求項１の作用効果に加えて、連結固定される複数の胴部の捻り角を、その胴部の占有角または周長から求めることにより、螺旋トンネルから突出する胴部断面積を少なくして余掘り量を減少させることができ、スムーズに非円形断面の螺旋トンネルを掘削することができる。
請求項４記載の発明によれば、請求項２の作用効果に加えて、連結固定される複数の胴部の捻り角を、その胴部の占有角または周長から求めることにより、螺旋トンネルから突出する胴部断面積を少なくして余掘り量を減少させることができ、スムーズに非円形断面の螺旋トンネルを掘削することができる。 According to the third aspect of the invention, in addition to the effects of claim 1, the twist angle of the plurality of body portions to be connected and fixed, by obtaining from the occupation angle or circumferential length of the body portion, the helical tunnel It is possible to reduce the amount of surplus digging by reducing the protruding cross section of the trunk portion, and it is possible to smoothly excavate a spiral tunnel having a non-circular cross section.
According to the invention described in claim 4, in addition to the function and effect of claim 2, by obtaining the twist angles of the plurality of body parts to be connected and fixed from the occupation angle or the circumferential length of the body parts, It is possible to reduce the amount of surplus digging by reducing the protruding cross section of the trunk portion, and it is possible to smoothly excavate a spiral tunnel having a non-circular cross section.

請求項５記載の発明によれば、前側胴部と後側胴部の連結部に、胴部拡張部に連続する増径面部や胴部拡張部を削除する削除面部を形成することにより、連結部における断部をなくして連続面を形成することができ、掘進抵抗を低減することができる。 According to the invention described in claim 5, the connecting portion between the front body portion and the rear body portion is formed by forming a deletion surface portion that deletes the enlarged diameter surface portion and the body portion expansion portion continuous to the body portion expansion portion. A continuous surface can be formed without a cut portion in the portion, and the digging resistance can be reduced.

本発明に係る螺旋トンネル掘削用シールド掘進機の実施例１を示し、シールド本体の概略斜視図である。1 is a schematic perspective view of a shield main body according to a first embodiment of a shield tunneling machine for spiral tunnel excavation according to the present invention. シールド本体の連結部を示す正面視の横断面図である。It is a cross-sectional view of a front view showing a connecting portion of a shield body. 螺旋トンネルを示す側面図である。It is a side view which shows a spiral tunnel. （ａ）〜（ｃ）は捻り角の説明図で、（ａ）は平面図、（ｂ）は側面図、（ｃ）は同図（ａ）に示すＡ−Ａ矢視図である。(A)-(c) is explanatory drawing of a twist angle, (a) is a top view, (b) is a side view, (c) is an AA arrow line view shown to the same figure (a). シールド掘進機を示す平面視の断面図である。It is sectional drawing of the planar view which shows a shield machine. シールド掘進機を示す縦断面図である。It is a longitudinal cross-sectional view which shows a shield machine. 本発明に係る螺旋トンネル掘削用シールド掘進機の実施例２を示し、３つの胴部を有するシールド掘進機の概略平面図である。It is a schematic plan view of the shield machine which has Example 3 of the shield machine for spiral tunnel excavation which concerns on this invention, and has three trunk parts. （ａ）〜（ｆ）はそれぞれ他の非円形断面の螺旋トンネルを掘削するシールド掘進機の胴部を示す正面図で、（ａ）は楕円形断面、（ｂ）はまゆ形断面、（ｃ）は角丸正方形断面、（ｄ）は長円形断面、（ｅ）は釣鐘形断面、（ｆ）は長辺膨出タイプの矩形断面を示す。(A)-(f) is a front view which shows the trunk | drum of the shield machine which excavates the spiral tunnel of another non-circular cross section, respectively, (a) is an elliptical cross section, (b) is an eyebrows cross section, (c ) Is a rounded square cross section, (d) is an oval cross section, (e) is a bell-shaped cross section, and (f) is a long side bulge type rectangular cross section. （ａ）〜（ｄ）はそれぞれ本発明に係るシールド掘進機の胴部の実施例３を示し、（ａ）は実施例１の連結部を示す横断面図、（ｂ）は実施例１の連結部を示す斜視図、（ｃ）は第１連結構造の増設部と削除部を示す斜視図、（ｄ）は第１連結構造の増径面部と削除面部を示す斜視図である。(A)-(d) shows Example 3 of the trunk | drum of the shield machine which concerns on this invention, respectively, (a) is a cross-sectional view which shows the connection part of Example 1, (b) is Example 1 of FIG. The perspective view which shows a connection part, (c) is a perspective view which shows the expansion part and deletion part of a 1st connection structure, (d) is a perspective view which shows the enlarged diameter surface part and deletion surface part of a 1st connection structure. （ａ）および（ｂ）はそれぞれ実施例３の第２連結構造を示し、（ａ）は増設部と削除部を示す斜視図、（ｂ）は増径面部と削除面部を示す斜視図である。(A) And (b) shows the 2nd connection structure of Example 3, respectively (a) is a perspective view which shows an expansion part and a deletion part, (b) is a perspective view which shows a diameter-increasing surface part and a deletion surface part. . （ａ）および（ｂ）はそれぞれ実施例３の第３連結構造を示し、（ａ）は増設部と削除部を示す斜視図、（ｂ）は増径面部と削除面部を示す斜視図である。(A) And (b) shows the 3rd connection structure of Example 3, respectively, (a) is a perspective view which shows an expansion part and a deletion part, (b) is a perspective view which shows a diameter-increasing surface part and a deletion surface part. . （ａ）および（ｂ）はそれぞれ本発明に係るまゆ形断面の螺旋トンネル掘削用シールド掘進機の胴部の実施例４の基本構造を示し、（ａ）は正面図、（ｂ）は斜視図である。(A) And (b) shows the basic structure of Example 4 of the trunk | drum of the shield tunneling machine for spiral tunnel excavation of the eyebrows-shaped section which concerns on this invention, respectively, (a) is a front view, (b) is a perspective view. It is. （ａ）〜（ｃ）はそれぞれ実施例４の連結部の第１連結構造を示し、（ａ）は正面図、（ｂ）は斜視図、（ｃ）は平面図である。(A)-(c) shows the 1st connection structure of the connection part of Example 4, respectively (a) is a front view, (b) is a perspective view, (c) is a top view. （ａ）〜（ｃ）はそれぞれ実施例４の連結部の第２連結構造を示し、（ａ）は正面図、（ｂ）は斜視図、（ｃ）は平面図である。(A)-(c) shows the 2nd connection structure of the connection part of Example 4, respectively (a) is a front view, (b) is a perspective view, (c) is a top view. 本発明に係る螺旋トンネル掘削用シールド掘進機の折り曲げ部を有する胴部の実施例５の基本構造を示し、（ａ）は平面図、（ｂ）は斜視図、（ｃ）は分解斜視図である。The basic structure of Example 5 of the trunk | drum which has a bending part of the shield machine for spiral tunnel excavation which concerns on this invention is shown, (a) is a top view, (b) is a perspective view, (c) is an exploded perspective view. is there. （ａ）〜（ｃ）はそれぞれ実施例５の連結部を示し、（ａ）は第１連結構造を示す斜視図、（ｂ）は第２連結構造を示す斜視図、（ｃ）は第３連結構造を示す斜視図である。(A)-(c) shows the connection part of Example 5, respectively, (a) is a perspective view which shows a 1st connection structure, (b) is a perspective view which shows a 2nd connection structure, (c) is 3rd. It is a perspective view which shows a connection structure. 本発明に係る螺旋トンネル掘削用シールド掘進機の折り曲げ部を有する胴部の実施例６の基本構造を示し、（ａ）は平面図、（ｂ）は斜視図、（ｃ）は分解斜視図である。The basic structure of Example 6 of the trunk | drum which has a bending part of the shield machine for spiral tunnel excavation which concerns on this invention is shown, (a) is a top view, (b) is a perspective view, (c) is an exploded perspective view. is there. （ａ）および（ｂ）はそれぞれ実施例６の連結部を示し、（ａ）は第１連結構造を示す斜視図、（ｂ）は第２連結構造を示す斜視図である。(A) And (b) shows the connection part of Example 6, respectively (a) is a perspective view which shows a 1st connection structure, (b) is a perspective view which shows a 2nd connection structure. （ａ）〜（ｄ）はそれぞれ従来の技術を説明するシールド掘進機と掘削トンネルを示し、（ａ）は従来の屈曲式シールド掘進機、（ｂ）は特許文献１に開示された円弧状の屈曲式シールド掘進機、（ｃ１）は螺旋面の正面図、（ｃ２）は螺旋面の左側面端面図、（ｃ３）は傾斜円弧面の平面図、（ｃ４）は傾斜円弧面の正面図、（ｃ５）は（ｃ３）に示すＢ−Ｂ矢視端面図、（ｃ６）は水平円弧面の正面図、（ｃ７）は（ｃ８）に示すＣ−Ｃ矢視端面図、（ｃ８）は水平円弧面の平面、（ｄ）は螺旋トンネルと傾斜円弧トンネルの比較斜視図である。(A)-(d) shows the shield machine and excavation tunnel explaining a prior art, respectively, (a) is a conventional bending shield machine, (b) is the arc-shaped shape disclosed in Patent Document 1. Bending shield machine, (c1) is a front view of the spiral surface, (c2) is a left side end view of the spiral surface, (c3) is a plan view of the inclined arc surface, (c4) is a front view of the inclined arc surface, (C5) is an end view taken along the line B-B shown in (c3), (c6) is a front view of the horizontal arc surface, (c7) is an end view taken along the line CC shown in (c8), and (c8) is a horizontal view. The plane of the arc surface, (d) is a comparative perspective view of the spiral tunnel and the inclined arc tunnel.

以下、本発明に係るシールド掘進機の実施例を図面に基づいて説明する。
［実施例１］
図１，図３に示すように、この螺旋トンネル掘削用シールド掘進機は、螺旋軸Ｏｓを中心とする勾配：α、ピッチ：Ｐの螺旋経路Ｓに沿って矩形（正方形を含む）断面の螺旋トンネルＴｓを、上下辺が水平で左右側辺が鉛直な正立姿勢で掘削するもので、切羽崩壊土圧を保持する圧力室を有しない開放形に構成されている。もちろん、密閉形（圧力保持形）であってもよい。このシールド掘進機のシールド本体１１は、互いに連結された前胴１２と後胴１３とを具備し、螺旋トンネルＴｓよりひと回り大きい相似形の略矩形断面に形成されている。また前胴１２および後胴１３は、螺旋トンネルＴｓの螺旋軸Ｏｓを中心とする円弧状にそれぞれ形成されている。 Embodiments of a shield machine according to the present invention will be described below with reference to the drawings.
[Example 1]
As shown in FIG. 1 and FIG. 3, this shield tunneling machine for spiral tunnel excavation is a spiral having a rectangular (including square) cross section along a spiral path S with a gradient of α and a pitch of P around a spiral axis Os. The tunnel Ts is excavated in an upright posture in which the upper and lower sides are horizontal and the left and right sides are vertical, and is configured in an open shape without a pressure chamber for holding the face collapse earth pressure. Of course, it may be a sealed type (pressure holding type). The shield main body 11 of this shield machine has a front cylinder 12 and a rear cylinder 13 connected to each other, and is formed in a substantially rectangular cross section having a similar shape that is slightly larger than the spiral tunnel Ts. The front cylinder 12 and the rear cylinder 13 are each formed in an arc shape centered on the helical axis Os of the helical tunnel Ts.

前胴１２および後胴１３の外殻（スキンプレート）は、平板状の上面プレート１２Ｕ，１３Ｕおよび下面プレート１２Ｄ，１３Ｄと、円弧板状の内周面プレート１２Ｉ，１３Ｉおよび外周面プレート１２Ｏ，１３Ｏにより形成されている。 The outer shells (skin plates) of the front cylinder 12 and the rear cylinder 13 are flat upper plates 12U and 13U and lower plates 12D and 13D, arc-shaped inner peripheral plates 12I and 13I, and outer peripheral plates 120 and 13O. It is formed by.

図５，図６に示すように、前胴１２の前部に、上下方向の中央部に配置された水平区画板１４と、幅方向の中央部に配置された垂直区画板１５が設けられて、上下左右に四つの掘削室１６が形成され、各掘削室１６に、作業員によりそれぞれ操作されるバックホー形の掘削装置１７が２基ずつを設置されている。また各掘削室１６には、集荷排土コンベヤ１８がそれぞれ設置され、掘削した土砂を集荷排土コンベヤ１８から合流排土コンベヤ１９を介してシールド本体１１の後方に搬出する。 As shown in FIG. 5 and FIG. 6, a horizontal partition plate 14 disposed at the center portion in the vertical direction and a vertical partition plate 15 disposed at the center portion in the width direction are provided at the front portion of the front barrel 12. Four excavation chambers 16 are formed on the upper, lower, left, and right sides, and two backhoe excavation devices 17 each operated by an operator are installed in each excavation chamber 16. Each excavation chamber 16 is provided with a collection and discharge conveyor 18, and the excavated earth and sand are carried out from the collection and discharge conveyor 18 to the rear of the shield main body 11 through the merged discharge conveyor 19.

後胴１３には、螺旋トンネルＴｓの内面に沿って複数のセグメント（覆工体）２３を矩形断面に組み立てるエレクタ装置２１が配置されている。またエレクタ装置２１の外周部には、組み立てられたセグメント２３を反力受けとしてシールド本体１１を推進させる複数の推進ジャッキ２２が周方向所定間隔ごとに設置されている。 The rear trunk 13 is provided with an erector device 21 for assembling a plurality of segments (covering bodies) 23 into a rectangular cross section along the inner surface of the spiral tunnel Ts. In addition, a plurality of propulsion jacks 22 for propelling the shield body 11 using the assembled segments 23 as reaction force receivers are installed at predetermined intervals in the circumferential direction of the erector device 21.

このシールド本体１１は、たとえば略１／２の占有角（θ／２）で旋回軸Ｏｓの半径方向でシールド本体１１の軸心（シールド軸心Ｏという）に直交する平面で分割された前胴１２と後胴１３とで構成され、前胴１２と後胴１３とは連結部３１で連結されている。この連結部３１では、前胴１２と後胴１３とをシールド軸心Ｏ周りに所定方向に所定の捻り角βで捻った状態で連結固定され、前胴１２の前端面と後胴１３の後端面とを、それぞれ螺旋トンネルＴｓに略合致させている。ここで「略」とは、掘削した螺旋トンネルＴｓ内でセグメント２３を組み立てる範囲で支障のない誤差をいう。 The shield body 11 is, for example, a front barrel divided by a plane orthogonal to the axis of the shield body 11 (referred to as the shield axis O) in the radial direction of the turning axis Os at an occupation angle (θ / 2) of approximately ½. 12 and the rear cylinder 13, and the front cylinder 12 and the rear cylinder 13 are connected by a connecting portion 31. In this connecting portion 31, the front barrel 12 and the rear barrel 13 are coupled and fixed around the shield axis O in a predetermined direction with a predetermined twist angle β, and the front end surface of the front barrel 12 and the rear barrel 13 are The end faces are substantially matched with the spiral tunnel Ts. Here, “substantially” refers to an error that does not hinder the range in which the segment 23 is assembled in the excavated spiral tunnel Ts.

すなわち、この連結部３１は、前胴１２の後端部に、スキンプレート１２Ｕ，１２Ｄ，１２Ｉ，１２Ｏからシールド軸心Ｏに直交する平面上で内側に直角に折り曲げられた前フランジ板３２が設けられ、後胴１３の前端部に、スキンプレート１３Ｕ，１３Ｄ，１３Ｉ，１３Ｏからシールド軸心Ｏに直交する平面上で内側に直角に折り曲げられて、前記前フランジ板３２に対面される後フランジ板３３が設けられている。そしてこれら前フランジ板３２と後フランジ板３３が、たとえば周方向所定間隔ごとに取り付けられた複数の連結具である連結ボルト（連結手段）３４により連結固定されている。この連結ボルト３４は、連結手段として特に限定されるものではなく、溶接接合などを用いてもよい。 That is, the connecting portion 31 is provided with a front flange plate 32 bent at a right angle on the plane perpendicular to the shield axis O from the skin plates 12U, 12D, 12I, 12O at the rear end portion of the front barrel 12. The rear flange plate is bent at the front end of the rear barrel 13 from the skin plates 13U, 13D, 13I, and 13O at a right angle on a plane orthogonal to the shield axis O and faces the front flange plate 32. 33 is provided. The front flange plate 32 and the rear flange plate 33 are connected and fixed by connecting bolts (connecting means) 34 which are a plurality of connecting tools attached at predetermined intervals in the circumferential direction, for example. The connection bolt 34 is not particularly limited as a connection means, and welding connection or the like may be used.

（前胴と後胴の捻りについて）
ここで、前胴１２と後胴１３との捻り角βが必要な理由を簡単に説明する。
矩形断面の螺旋トンネルを掘削する場合、セグメントは正立姿勢で組み立てられるため、後胴の後端面を正立姿勢に保持する必要がある。円弧状のシールド本体では、前述したように、掘進方向に左右一方に旋回して螺旋経路Ｓを掘削する場合、シールド本体は左右一方に回転するので、左右他方側に強制的に捻りを加えながら掘進する必要がある。たとえば掘進方向に左旋回して螺旋経路Ｓを掘進する場合、シールド本体は反時計回りに回転するので、強制的に時計回りに捻りを加えながら掘進する。 (About torsion of the front and back torso)
Here, the reason why the twist angle β between the front cylinder 12 and the rear cylinder 13 is necessary will be briefly described.
When excavating a spiral tunnel having a rectangular cross section, the segments are assembled in an upright posture, and thus the rear end surface of the rear trunk needs to be held in an upright posture. In the arc-shaped shield body, as described above, when the spiral path S is excavated by turning left and right in the excavation direction, the shield body rotates to the left and right, so that the left and right other side is forcibly twisted. Need to dig. For example, when turning to the left in the digging direction and digging up the spiral path S, the shield body rotates counterclockwise, and thus digging while forcibly twisting clockwise.

この場合、シールド本体前端の掘削部では、予め通過するシールド本体後方側の捻り分の余掘り量を掘削するが、この余掘り量は余分な空間を形成するだけであり、これだけでシールド本体の姿勢を変更するだけのローリング（捻り）力が働くものではない。またシールド本体は、後部周囲に設けられた推進ジャッキにより推力を与えられ、これら推進ジャッキの伸縮量により（屈曲式シールドの場合は、屈曲ジャッキによる上下左右の屈曲と共に）姿勢制御を行っているが、シールド本体１１が矩形断面の螺旋トンネル内で拘束されているので、シールド軸心Ｏ周りのローリング（捻り）制御は極めて困難である。 In this case, the excavation part at the front end of the shield body excavates the excessive amount of twist on the rear side of the shield body that passes in advance, but this excessive amount of excavation only forms an extra space. Rolling (twisting) force that only changes posture does not work. In addition, the shield body is given thrust by a propulsion jack provided around the rear, and the posture is controlled by the amount of expansion and contraction of these propulsion jacks (in the case of a bent shield, along with the vertical and horizontal bending by the flex jack). Since the shield body 11 is constrained in a spiral tunnel having a rectangular cross section, rolling (twisting) control around the shield axis O is extremely difficult.

このため、本発明では、前胴１２と後胴１３とを、予め所定の捻り角βで捻って連結固定しておくことで、前胴１２の前端部でほぼ螺旋トンネルの断面に沿って掘削すれば、この掘削面を後胴１３が通過するときに捻り力が働き、これが連続的に行われることにより、螺旋経路Ｓに沿って捻りながら掘進できるとともに掘削断面も正立姿勢で連続させることかでき、余掘り量も少なくすることができて地盤沈下も抑制することができる。 For this reason, in the present invention, the front cylinder 12 and the rear cylinder 13 are connected and fixed in advance by a predetermined twist angle β, so that the front end of the front cylinder 12 is excavated substantially along the cross section of the spiral tunnel. Then, when the rear trunk 13 passes through this excavation surface, a torsional force works, and this is continuously performed, so that the excavation can be continued while twisting along the spiral path S, and the excavation cross section can be continued in an upright posture. However, the amount of excessive digging can be reduced, and land subsidence can be suppressed.

ところで、上記対策として、シールド本体を螺旋トンネルに一致するように、予め捻った立体形状に形成することも考えられる。しかし、シールド本体の外殻であるスキンプレートを、予め捻られた立体形状に形成するためには、極めて高度な技術が必要で、製作コストが嵩む。またシールド本体が、螺旋半径および勾配の決まった螺旋トンネルしか掘削することができない専用機となることから、再利用が困難で汎用性が低いという問題がある。 By the way, as the above countermeasure, it is conceivable to form the shield body in a three-dimensional shape twisted in advance so as to coincide with the spiral tunnel. However, in order to form the skin plate, which is the outer shell of the shield body, into a pre-twisted three-dimensional shape, an extremely advanced technique is required, and the manufacturing cost increases. In addition, since the shield body is a dedicated machine that can only excavate a spiral tunnel with a fixed spiral radius and gradient, there is a problem that reuse is difficult and versatility is low.

（捻り角）
次に前胴１２と後胴１３の捻り角βについて、図４を参照して説明する。
螺旋軸Ｏｓを中心とし、螺旋半径：Ｒの螺旋経路Ｓ上で、点Ｐ０から占有角：θ（rad）を隔てた点Ｐ１に至る円弧の周長：Ｌ（円弧面の内周長とする）は、
Ｌ＝Ｒ×θ…（１）式で求められる。
また螺旋経路Ｓのリード角：αとすると、点Ｐ０−Ｐ１間のリード：Ｈは、
tanα＝Ｈ／Ｌ→Ｈ＝Ｌ×tanα…（２）式で求められる。
さらに図４（ｃ）に示すように、円弧面の前辺の傾き角∠ＰＯ−Ｏｓ’−Ｐ１である捻れ角β（rad）から求められる点Ｐ０−Ｐ１間のリード：Ｈは、
tanβ＝Ｈ／Ｒ→Ｈ＝Ｒ×tanβ…（３）式で求められる。ここで捻れ角β（rad）は、（円弧面の前辺の傾き角∠ＰＯ−Ｏｓ’−Ｐ１）
上記（１）、（２）式から、
Ｒ×tanβ＝Ｌ×tanα、（３）式を代入すると、
Ｒ×tanβ＝Ｒ×θ×tanα
β＝tan^-1(θ×tanα)…（４）式により、捻り角：βを求めることができ、螺旋トンネルＴｓを掘削するには、後胴１３に対して前胴１２を捻り角：βとは逆方向にβだけ捻ればよい。 (Torsion angle)
Next, the twist angle β of the front cylinder 12 and the rear cylinder 13 will be described with reference to FIG.
Centered on the spiral axis Os, on the spiral path S with the spiral radius: R, the circumference of the arc from the point P0 to the point P1 separated by the occupation angle: θ (rad): L (the inner circumference of the arc surface) )
L = R × θ... (1)
If the lead angle of the spiral path S is α, the lead between the points P0 and P1: H is
tanα = H / L → H = L × tanα (2)
Further, as shown in FIG. 4C, the lead: H between points P0-P1 obtained from the twist angle β (rad) which is the inclination angle ∠PO-Os′-P1 of the front side of the arc surface is:
tanβ = H / R → H = R × tanβ (3) Here, the twist angle β (rad) is (tilt angle ∠PO-Os'-P1 of the front side of the arc surface)
From the above formulas (1) and (2),
R × tan β = L × tan α, substituting equation (3),
R × tanβ = R × θ × tanα
.beta. = tan.sup.- ¹ (.theta..times.tan .alpha.) (4) The torsion angle: .beta. can be obtained, and in order to excavate the spiral tunnel Ts, the torsion angle: .beta. Is twisted by β in the opposite direction.

（実施例１の効果）
上記実施例によれば、矩形断面のシールド本体１１を構成する前胴１２と後胴１３を円弧状に形成するとともに、その連結部３１で、後胴１３に対して前胴１２を、掘進方向に左旋回して螺旋トンネルを掘削する場合には、時計方向に所定の捻り角だけ捻って連結固定し、また掘進方向に右旋回して螺旋トンネルを掘削する場合には、反時計方向に所定の捻り角だけ捻って連結固定し、これにより、シールド本体１１の前端面と後端面とを螺旋経路Ｓ上の螺旋トンネルＴｓの断面に略合致させることにより、余掘り量を極力少なくして、シールド本体１１を掘進することで掘削した螺旋トンネルＴｓの断面により、シールド本体をローリングさせる捻り力を付与することができ、螺旋トンネルＴｓを正立姿勢でスムーズに掘削することができる。またシールド本体１１を、螺旋経路Ｓを中心とする円弧状に形成した前胴１２と後胴１３とを、連結部３１で捻って連結するだけでよいので、低コストで製作できる。さらに連結部３１で捻り角を変更することにより、勾配の異なる螺旋トンネルＴｓを掘削することができ、汎用性を拡大することができる。 (Effect of Example 1)
According to the above-described embodiment, the front cylinder 12 and the rear cylinder 13 constituting the shield body 11 having a rectangular cross section are formed in an arc shape, and the front cylinder 12 is formed in the direction of digging with respect to the rear cylinder 13 by the connecting portion 31. When excavating a spiral tunnel by turning counterclockwise, it is fixedly connected by twisting clockwise by a predetermined twist angle, and when excavating a spiral tunnel by turning right in the excavation direction, By connecting and fixing by twisting only the twist angle, the front end surface and the rear end surface of the shield body 11 are substantially matched to the cross section of the spiral tunnel Ts on the spiral path S, thereby reducing the amount of overexcavation as much as possible. The cross section of the spiral tunnel Ts excavated by excavating the main body 11 can give a twisting force for rolling the shield main body, and the spiral tunnel Ts can be excavated smoothly in an upright posture. . Further, since the shield body 11 only has to be connected by twisting the front cylinder 12 and the rear cylinder 13 formed in an arc shape with the spiral path S as the center at the connection portion 31, it can be manufactured at low cost. Further, by changing the twist angle at the connecting portion 31, it is possible to excavate the spiral tunnel Ts having different gradients, and to expand versatility.

（実施例１の変形例）
上記実施例１および２では、矩形断面のトンネルＴｓを掘削するシールド掘進機で説明したが、図８（ａ）に示すように、前胴５１ｆと後胴５１ｒとを有する楕円形断面のシールド本体５１や、図８（ｂ）に示すように、前胴５２ｆと後胴５２ｒとを有するまゆ形断面のシールド本体５２、図８（ｃ）に示すように、前胴５３ｆと後胴５３ｒとを有する角丸矩形断面のシールド本体５３、図８（ｄ）に示すように、前胴５４ｆと後胴５４ｒとを有する長円形断面のシールド本体５４、図８（ｅ）に示すように、前胴５５ｆと後胴５５ｒとを有する釣鐘形断面のシールド本体５５、図８（ｆ）に示すように、前胴５６ｆと後胴５６ｒとを有する長辺膨出タイプの矩形断面のシールド本体５６であってもよい。 (Modification of Example 1)
In the first and second embodiments described above, the shield machine for excavating the tunnel Ts having a rectangular cross section has been described. However, as shown in FIG. 8A, the shield main body having an oval cross section having a front trunk 51f and a rear trunk 51r. 51, as shown in FIG. 8 (b), a shield body 52 having a cross-sectional shape having a front barrel 52f and a rear barrel 52r, and a front barrel 53f and a rear barrel 53r as shown in FIG. 8 (c). A shield body 53 having a rounded rectangular cross section, as shown in FIG. 8 (d), a shield body 54 having an oval cross section having a front cylinder 54f and a rear cylinder 54r, and a front cylinder as shown in FIG. 8 (e). A shield main body 55 having a bell-shaped cross section having a front body 56f and a rear body 55r, as shown in FIG. 8 (f), and a shield body 56 having a long side bulging type rectangular section having a front body 56f and a rear body 56r. May be.

これらシールド本体５１〜５６をそれぞれ螺旋軸を中心とした円弧形に形成するとともに、前胴５１ｆ〜５６ｆと後胴５１ｒ〜５６ｒとで形成し、後胴５１ｒ〜５６ｒに対して前胴５１ｆ〜５６ｆをシールド軸心Ｏ周りに所定方向の捻り角βだけ捻って連結固定することにより、螺旋トンネルＴｓをそれぞれスムーズに掘削することができる。またこれらのシールド本体５１〜５６は、さらに中胴を付加した前後三連以上の胴部で構成してもよい。 These shield bodies 51 to 56 are formed in arc shapes around the spiral axis, respectively, and are formed of front cylinders 51f to 56f and rear cylinders 51r to 56r, and the front cylinders 51f to 56r are formed with respect to the rear cylinders 51r to 56r. By twisting and fixing 56f around the shield axis O by a twist angle β in a predetermined direction, the helical tunnels Ts can be excavated smoothly. Moreover, you may comprise these shield main bodies 51-56 with the trunk | drum of the front and rear 3 series or more which added the middle trunk | drum further.

［実施例２］
このシールド本体４１は、図７に示すように、掘進方向に向かって左旋回する螺旋トンネルＴｓを掘削するもので、前胴４２と中胴４３とを前連結部４５を介して掘進方向に向かって時計方向に捻り角β１で捻って連結固定し、中胴４３と、後胴４４とを後連結部４６を介して掘進方向に向かって時計方向に捻り角β２で捻って連結固定したものである。これにより前胴４２の前端面と後胴の後端面とを、螺旋経路Ｓ上の螺旋トンネルＴｓの断面に略合致される。さらに連結部４５，４６の捻り角：β１およびβ２は、連結部４５，４６に接する前後の胴部の長さ（占有角）、すなわち端部の胴部４２，４４は全占有角、中間の胴４３部は占有角の１／２の比で求められる。すなわち、前胴４２の占有角：θ１、中胴４３の占有角：θ２、後胴４４の占有角：θ３とすると、
β１：β２＝（θ１＋θ２／２）：（θ２／２＋θ３）…（５）式
となる。 [Example 2]
As shown in FIG. 7, the shield body 41 excavates a spiral tunnel Ts that turns leftward in the excavation direction, and the front trunk 42 and the middle trunk 43 are directed to the excavation direction via the front coupling portion 45. The middle barrel 43 and the rear barrel 44 are coupled and fixed in a clockwise direction with a twist angle β2 toward the digging direction via the rear coupling portion 46. is there. As a result, the front end surface of the front cylinder 42 and the rear end surface of the rear cylinder are substantially matched with the cross section of the spiral tunnel Ts on the spiral path S. Further, the torsion angles β1 and β2 of the connecting portions 45, 46 are the lengths (occupied angles) of the front and rear body portions contacting the connecting portions 45, 46, that is, the end body portions 42, 44 are the total occupied angles, 43 parts of trunk | drum are calculated | required by the ratio of 1/2 of an occupation angle. That is, when the occupation angle of the front barrel 42 is θ1, the occupation angle of the middle barrel 43 is θ2, and the occupation angle of the rear barrel 44 is θ3,
β1: β2 = (θ1 + θ2 / 2): (θ2 / 2 + θ3) (5)

なお、上記占有角θ１〜θ３に替えて、各胴部４２〜４３のシールド軸心Ｏ上の周長Ｌ１〜Ｌ３であってもよい。
β１：β２＝（Ｌ１＋Ｌ２／２）：（Ｌ２／２＋Ｌ３）…（６）式
上記構成によれば、連結部４５，４６を複数個所設けて捻り角β１，β２を付与することにより、周長の長いシールド本体４１や螺旋半径の小さい螺旋トンネルであっても、スムーズに掘削することができる。 Instead of the occupation angles θ1 to θ3, the circumferential lengths L1 to L3 on the shield axis O of the body portions 42 to 43 may be used.
β1: β2 = (L1 + L2 / 2): (L2 / 2 + L3) (6) Formula According to the above configuration, by providing a plurality of connecting portions 45, 46 and providing twist angles β1, β2, Even a long shield body 41 or a spiral tunnel with a small spiral radius can be excavated smoothly.

［実施例３］
螺旋トンネル掘削用シールド掘進機の実施例３を、図９〜図１１を参照して説明する。このシールド掘進機は、正方形断面の螺旋トンネルを掘削するためのもので、実施例１と同一、略同一部材には同一符号を付して説明を省略する。 [Example 3]
Third Embodiment A shield tunneling machine for spiral tunnel excavation will be described with reference to FIGS. This shield machine is for excavating a spiral tunnel having a square cross section, and the same reference numerals are assigned to substantially the same members as in the first embodiment, and the description thereof is omitted.

図９（ａ），（ｂ）に示すように、前胴１２と後胴１３とで構成されたシールド本体１１は、その連結部３１で捻り角βで捻られて連結されており、この連結部３１では、後胴１３の後胴連結端面６３に対して前胴１２の前胴連結端面６２が外側にはみ出す前胴拡張部（胴部拡張部）６４と、前胴連結端面６２に対して後胴連結端面６３が外側にはみ出す後胴拡張部（胴部拡張部）６５とが断付き状に形成される。このような前胴拡張部６４および後胴拡張部６５は、掘削トンネルの内面に接触し掘進抵抗を与えるおそれがあるため、この掘進抵抗を軽減することが望ましい。 As shown in FIGS. 9 (a) and 9 (b), the shield body 11 composed of the front cylinder 12 and the rear cylinder 13 is connected by being twisted at a torsion angle β at the connecting portion 31. In the portion 31, the front cylinder connecting end surface 62 of the front cylinder 12 protrudes outward from the rear cylinder connecting end surface 63 of the rear cylinder 13, and the front cylinder connecting end surface 62. A rear trunk extension portion (body extension portion) 65 from which the rear trunk coupling end surface 63 protrudes outward is formed in a cut-off shape. Since the front trunk extension 64 and the rear trunk extension 65 may contact the inner surface of the excavation tunnel and give digging resistance, it is desirable to reduce the digging resistance.

この対策として、図９（ｃ），（ｄ）に示すように、後胴連結端面６３を基準面とする第１連結構造と、図１０（ａ），（ｂ）に示すように、前胴連結端面６２を基準面とする第２連結構造と、図１１（ａ），（ｂ）に示すように、前胴連結端面６２と後胴連結端面６３との合致面を規準面とする第３連結構造を提案している。 As countermeasures against this, as shown in FIGS. 9C and 9D, the first connecting structure having the rear cylinder connecting end face 63 as a reference plane, and the front cylinder as shown in FIGS. 10A and 10B. As shown in FIGS. 11A and 11B, a second connection structure having the connection end surface 62 as a reference surface, and a third connection surface having a matching surface between the front cylinder connection end surface 62 and the rear cylinder connection end surface 63 as a reference surface. Proposed connection structure.

（第１連結構造）
第１連結構造は、図９（ｃ）（ｄ）に示すように、後胴連結端面６３を基準として、前胴１２のスキンプレート１２Ｕ，１２Ｄ，１２Ｏ，１２Ｉに、前胴１２の中間部にある前胴中央横断面ＦＣＰから後胴拡張部６５の外縁に至る高さの低い直角三角錐空間Ｐに増径面部６６Ｆを増設することにより、その平坦な外面で前胴１２外面から後胴拡張部６５に連続させる。 (First connection structure)
As shown in FIGS. 9C and 9D, the first connection structure is formed on the skin plate 12U, 12D, 12O, 12I of the front cylinder 12 and in the middle part of the front cylinder 12 with the rear cylinder connection end surface 63 as a reference. By expanding the diameter-increasing surface portion 66F in the right triangular pyramid space P having a low height extending from a certain front trunk central cross section FCP to the outer edge of the rear trunk extension 65, the rear trunk is expanded from the outer surface of the front trunk 12 with its flat outer surface. Continue to part 65.

また前胴１２の中間部にある前胴中央横断面ＦＣＰから前胴拡張部６４に至る高さの低い直角三角錐形部分Ｑを削除する削除面部６７Ｆを形成することにより、その平坦な削除面で前胴１２の外面から後胴１３の外面に連続させる。 Further, by forming a deletion surface portion 67F that deletes the low-angle right triangular pyramid portion Q extending from the front cylinder central cross section FCP to the front cylinder extension 64 in the middle portion of the front cylinder 12, the flat deletion surface is formed. Then, the outer surface of the front cylinder 12 is continued from the outer surface of the rear cylinder 13.

（第２連結構造）
第２連結構造は、図１０（ａ）（ｂ）に示すように、前胴連結端面６２を基準として、後胴１３のスキンプレート１３Ｕ，１３Ｄ，１３Ｏ，１３Ｉに、前胴拡張部６４の外縁から後胴１３の後胴中央横断面ＲＣＰに至る高さの低い直角三角錐空間Ｐに増径面部６６Ｒを増設することにより、その平坦な外面で前胴拡張部６４から後胴１３の外面に連続させる。 (Second connection structure)
As shown in FIGS. 10A and 10B, the second connection structure has the outer edge of the front body extension portion 64 on the skin plates 13U, 13D, 13O, and 13I of the rear cylinder 13 with the front cylinder connection end surface 62 as a reference. By increasing the diameter-increasing surface portion 66R in the right triangular pyramid space P having a low height extending from the rear cylinder 13 to the rear cylinder central cross section RCP, the flat outer surface extends from the front cylinder extension 64 to the outer surface of the rear cylinder 13. Make it continuous.

また後胴拡張部６５から後胴中央横断面ＲＣＰに至る高さの低い直角三角錐形部分Ｑを削除して削除面部６７Ｒを形成することにより、その平坦な削除面で前胴１２の外面から後胴１３の外面に連続させる。 Further, by removing the low-angle triangular pyramid portion Q having a low height from the rear trunk extension 65 to the rear trunk central cross-section RCP, a removal surface portion 67R is formed from the outer surface of the front cylinder 12 by the flat removal surface. The outer surface of the back barrel 13 is continued.

（第３連結構造）
第３連結構造は、図１１（ａ）（ｂ）に示すように、前胴連結端面６４と後胴連結端面６３とが互いに重なり合う八角形の合致面を基準として、前胴１２のスキンプレート１２Ｕ，１２Ｄ，１２Ｏ，１２Ｉに、前胴中央横断面ＦＣＰから前胴拡張部６４に至る高さの低い直角三角錐形部分ＱＦを削除して削除面部６７Ｆを形成することにより、その平坦な削除面で前胴１２の外面から後胴１３の外面を連続させる。 (Third connection structure)
As shown in FIGS. 11A and 11B, the third connection structure has a skin plate 12U of the front cylinder 12 with reference to an octagonal matching surface where the front cylinder connection end face 64 and the rear cylinder connection end face 63 overlap each other. , 12D, 12O, and 12I, by deleting the right triangular pyramid portion QF having a low height from the front cylinder central cross section FCP to the front cylinder extension 64 to form a deletion surface portion 67F, the flat deletion surface Then, the outer surface of the rear cylinder 13 is continued from the outer surface of the front cylinder 12.

また後胴１３のスキンプレート１３Ｕ，１３Ｄ，１３Ｏ，１３Ｉに、後胴拡張部６５から後胴中央横断面ＲＣＰに至る高さの低い直角三角錐形の部分ＱＲを削除して削除面部６７Ｒを形成することにより、その平坦な削除面で前胴１２の外面と後胴１３の外面とを連続させる。 Further, a deletion face portion 67R is formed on the skin plates 13U, 13D, 13O, and 13I of the rear cylinder 13 by deleting a low-right triangular pyramid-shaped portion QR that extends from the rear cylinder extension 65 to the rear cylinder central cross section RCP. By doing so, the outer surface of the front cylinder 12 and the outer surface of the rear cylinder 13 are made continuous with the flat deleted surface.

なお、これら第１〜第３連結構造以外に、増径面部６６Ｆ，６６Ｒのみを増設することで連結部３１を構成することもできる。しかし、この場合には胴部外径が大きくなることから、掘進抵抗となるおそれがある。 In addition to the first to third connection structures, the connection portion 31 can be configured by adding only the diameter-increasing surface portions 66F and 66R. However, in this case, since the outer diameter of the trunk portion becomes large, there is a possibility that the resistance to excavation may occur.

上記第１〜第３連結構造によれば、前胴１２と後胴１３の連結部３１で、前胴１２と後胴１３のスキンプレート１２Ｕ，１２Ｄ，１２Ｉ，１２Ｏ，１３Ｕ，１３Ｄ，１３Ｉ，１３Ｏの連結部３１側に、前胴拡張部６４と後胴拡張部６５の段付き部をなくすために、前胴１２と後胴１３の外面を連続させる増径面部６６Ｆ，６６Ｒと削除面部６７Ｆ，６７Ｒ、または削除面部６７Ｆ，６７Ｒを設けたので、連結部３１における掘進抵抗を減少させて螺旋トンネルＴｓをスムーズに掘削することができる。 According to the first to third connection structures, the skin plate 12U, 12D, 12I, 12O, 13U, 13D, 13I, 13O of the front cylinder 12 and the rear cylinder 13 is formed at the connection portion 31 between the front cylinder 12 and the rear cylinder 13. In order to eliminate the stepped portions of the front body extension part 64 and the rear body extension part 65 on the connecting part 31 side, the diameter-increasing surface parts 66F and 66R and the deletion surface part 67F, which make the outer surfaces of the front cylinder 12 and the rear cylinder 13 continuous. Since the 67R or the deletion surface portions 67F and 67R are provided, it is possible to smoothly excavate the spiral tunnel Ts by reducing the digging resistance in the connecting portion 31.

［実施例４］
上記実施例１〜３では、矩形（正方形）断面の螺旋トンネルＴｓを掘削するシールド掘進機について説明したが、実施例４では、まゆ形断面の螺旋トンネルＴｓを掘削するシールド掘進機について、図１２，図１３を参照して説明する。なお、ここで、シールド本体の前部に設けられる掘削装置や後部に設けられるエレクタ装置などの内部機構の説明は省略する。 [Example 4]
In Examples 1 to 3 described above, the shield machine that excavates the spiral tunnel Ts having a rectangular (square) cross section has been described. In Example 4, the shield machine that excavates the spiral tunnel Ts having an eyebrows-shaped section is illustrated in FIG. This will be described with reference to FIG. In addition, description of internal mechanisms, such as the excavator provided in the front part of a shield main body, and the erector apparatus provided in the rear part, is abbreviate | omitted here.

このシールド掘進機は、螺旋軸を中心として掘進方向に向かってたとえば左方向に旋回してまゆ形断面の螺旋トンネルＴｓを掘削するもので、前胴７２および後胴７３からなるシールド本体７１は、螺旋軸を中心とする円弧状にそれぞれ形成されるとともに、図１２（ａ）（ｂ）に示すように、その連結部７４で後胴７３に対して前胴７２がシールド軸Ｏを中心に、左側に旋回する掘進方向に向かって時計方向にβだけ捻られて連結固定されている。 This shield machine excavates a spiral tunnel Ts having a cross-section of the eyebrows by turning leftward, for example, in the direction of drilling about the spiral axis. A shield body 71 composed of a front trunk 72 and a rear trunk 73 includes: As shown in FIGS. 12 (a) and 12 (b), the front cylinder 72 is centered on the shield axis O with respect to the rear cylinder 73 at the connecting portion 74, as shown in FIGS. It is connected and fixed by twisting β in the clockwise direction toward the excavation direction turning to the left.

この連結部７４では、後胴７３の後胴連結端面７４Ｒに対して前胴７２の前胴連結端面７４Ｆがはみ出す２箇所の前胴拡張部７５と、前胴７２の前胴連結端面７４Ｆに対して後胴７３の後胴連結端面７４Ｒがはみ出す２箇所の後胴拡張部７６が対称位置に形成される。 In this connecting portion 74, the front cylinder connecting end surface 74F of the front cylinder 72 protrudes from the rear cylinder connecting end surface 74R of the rear cylinder 73, and the front cylinder connecting end surface 74F of the front cylinder 72. Thus, two rear cylinder expansion portions 76 where the rear cylinder connection end surface 74R of the rear cylinder 73 protrudes are formed at symmetrical positions.

（第１連結構造）
図１３に示すように、この連結部７４には、掘進抵抗を軽減するために、後胴７３の連結端側に、対称位置の２つの後胴拡張部７６をそれぞれ削除する円筒テーパ面状の部分削除面部７７が形成されている。この部分削除面部７７により、前胴連結端面７４Ｆから後胴７３の外面に連続させることができ、掘進抵抗を軽減させることができる。 (First connection structure)
As shown in FIG. 13, the connecting portion 74 has a cylindrical tapered surface shape in which two rear trunk expansion portions 76 at symmetrical positions are deleted on the connecting end side of the rear trunk 73 in order to reduce the digging resistance. A partial deletion surface portion 77 is formed. By this partial deletion surface part 77, it can be made to continue from the front cylinder connection end surface 74F to the outer surface of the rear cylinder 73, and digging resistance can be reduced.

（第２連結構造）
図１４に示すように、シールド本体７１の後胴７３の連結端側に、後胴連結端面７４Ｒを含む全周にわたって全周削除面部７８を形成したもので、全周削除面部７８の外径が前胴連結端面７４Ｆと略同一か、小さく形成されている。この全周削除面部７８により２つの後胴拡張部７６を削除している。 (Second connection structure)
As shown in FIG. 14, the entire circumference deletion surface portion 78 is formed over the entire circumference including the rear cylinder connection end surface 74 </ b> R on the connection end side of the rear cylinder 73 of the shield body 71. It is formed to be substantially the same as or smaller than the front trunk connecting end face 74F. The two rear waist extension portions 76 are deleted by the entire circumference deletion surface portion 78.

この第２連結構造によれば、筒状の後胴７３の前部に、全周削除面部７８を形成するテーパ筒を接合することにより、後胴７３を容易に製作することができる。
上記実施例４によれば、実施例１と同様の作用効果を奏することができるとともに、前胴７２と後胴７３の連結部７４で、後胴７３のスキンプレートに、後胴拡張部６６の突出を削除する部分削除面部７７または全周削除面部７８を形成したので、連結部における後胴拡張部７６を無くすことができ、掘進抵抗を減少させて螺旋トンネルＴｓをスムーズに掘削することができる。 According to this second connection structure, the rear cylinder 73 can be easily manufactured by joining the tapered cylinder forming the entire peripheral deletion surface portion 78 to the front part of the cylindrical rear cylinder 73.
According to the fourth embodiment, the same operational effects as those of the first embodiment can be obtained, and the connecting portion 74 of the front cylinder 72 and the rear cylinder 73 can be connected to the skin plate of the rear cylinder 73 on the rear cylinder expansion portion 66. Since the partial deletion surface portion 77 or the entire circumference deletion surface portion 78 for deleting the protrusion can be formed, the rear trunk expansion portion 76 in the connecting portion can be eliminated, and the spiral tunnel Ts can be smoothly excavated by reducing the digging resistance. .

［実施例５］
上記各実施例１〜４では、シールド本体１１を螺旋軸を中心とする円弧状に形成した。ところで、図８（ａ）〜（ｆ）に示すような非円形断面では、特に内外周部に湾曲面を有している胴部は、円弧状に加工することがきわめて難しく、製作工程が複雑となり、製作期間も長く必要で、製作コストが嵩むという問題がある。このため、この実施例５では、軸方向に同一断面形状である直状断面に形成した複数の分割胴部を使用し、これら分割胴部を、螺旋軸を中心とする掘削トンネルの内外周線ＭＳｉ，ＭＳｏに内接するように、所定角度折り曲げて接合形成して、シールド本体８１を製作している。 [Example 5]
In each of the above Examples 1 to 4, the shield body 11 was formed in an arc shape centered on the spiral axis. By the way, in the non-circular cross section as shown in FIGS. 8A to 8F, it is extremely difficult to machine a barrel portion having a curved surface on the inner and outer peripheral portions, and the manufacturing process is complicated. Therefore, there is a problem that the production period is long and the production cost increases. For this reason, in the fifth embodiment, a plurality of divided body portions formed in a straight cross section having the same cross-sectional shape in the axial direction are used, and these divided body portions are connected to the inner and outer peripheral lines of the excavation tunnel centered on the spiral axis. The shield body 81 is manufactured by bending and bonding at a predetermined angle so as to be inscribed in MSi and MSo.

すなわち、図１６に示すように、正方形断面のシールド本体８１では、前胴８２と後胴８３とを、螺旋軸Ｏｓを中心とする掘削トンネルの円弧線（内外周線）ＭＳｉ，ＭＳｏに内接するように、前中央横断面ＦＣＰおよび後中央横断面ＲＣＰでそれぞれ所定の折り曲げ角γで折り曲げて形成している。なお、掘削装置やエレクタ装置などの内部機構は説明を省略する。 That is, as shown in FIG. 16, in the shield body 81 having a square cross section, the front trunk 82 and the rear trunk 83 are inscribed in the arc lines (inner and outer circumference lines) MSi and MSo of the excavation tunnel centered on the spiral axis Os. As described above, the front center cross section FCP and the rear center cross section RCP are each bent at a predetermined bending angle γ. In addition, description of internal mechanisms, such as a digging apparatus and an erector apparatus, is abbreviate | omitted.

製作に際しては、前胴８２と後胴８３の上下面は、それぞれ１枚の平板状の上下面プレート８２Ｕ，８２Ｄ，８３Ｕ，８３Ｄにより形成され、また内外周面は、それぞれ前後に２分割された平板状の分割内外周面プレート８２Ｉｆ，８２Ｉｒ、８２Ｏｆ，８２Ｏｒ、８３Ｉｆ，８３Ｉｒ、８３Ｏｆ，８３Ｏｒを、所定の折り曲げ角γで折り曲げた状態で溶接接合して形成される。さらに中央部で折り曲げられたこれら前胴８２と後胴８３とが、連結部３１で、先の実施例と同様に捻り角βだけ捻って連結固定される。 At the time of manufacture, the upper and lower surfaces of the front cylinder 82 and the rear cylinder 83 are each formed by a single flat plate upper and lower plate 82U, 82D, 83U, 83D, and the inner and outer peripheral surfaces are divided into two parts in the front and rear direction. The plate-shaped divided inner and outer peripheral surface plates 82If, 82Ir, 82Of, 82Or, 83If, 83Ir, 83Of, 83Or are welded and joined at a predetermined bending angle γ. Further, the front cylinder 82 and the rear cylinder 83 bent at the central portion are connected and fixed at the connecting portion 31 by twisting the twist angle β as in the previous embodiment.

上記構成によれば、円弧状に湾曲した前胴および後胴を製作するのに比較して、直状断面の分割胴部８２ｆ，８２ｒ、８３ｆ，８３ｒを内外周線ＭＳｉ，ＭＳｏに内接するように折り曲げた状態で前胴８２と後胴８３を製作するので、容易に製作することができ、製作コストおよび製作時間を削減することができる。 According to the above-described configuration, the divided body portions 82f, 82r, 83f, and 83r having a straight cross section are inscribed in the inner and outer peripheral lines MSi and MSo, as compared with the case where the front cylinder and the rear cylinder curved in an arc shape are manufactured. Since the front cylinder 82 and the rear cylinder 83 are manufactured in a state of being folded into two, they can be manufactured easily, and the manufacturing cost and the manufacturing time can be reduced.

（実施例５の第１〜第３変形例）
この連結部３１に、実施例３における第１連結構造の増径面部６６Ｆと削除面部６７Ｆを前胴８２に設けたものを図１７（ａ）に示し、第２連結構造の増径面部６６Ｒと削除面部３７Ｒを後胴８３に設けたものを図１７（ａ）に示し、第３連結構造の削除面部６７Ｆ，６７Ｒを前胴８２と後胴８３設けたものを図１７（ａ）に示す。これら第１〜第３変形例によれば、上記作用効果に加えて、連結部３１に突出部がなくなり、掘進抵抗を軽減することができる。 (First to third modifications of the fifth embodiment)
FIG. 17 (a) shows the connecting portion 31 provided with the increased diameter surface portion 66F of the first connection structure and the deletion surface portion 67F in the first connection structure in the third embodiment, and the increased diameter surface portion 66R of the second connection structure. FIG. 17A shows the removal surface portion 37R provided on the rear cylinder 83, and FIG. 17A shows the third connection structure deletion surface portions 67F and 67R provided on the front cylinder 82 and the rear cylinder 83. According to these 1st-3rd modification, in addition to the said effect, a connection part 31 does not have a protrusion part, and digging resistance can be reduced.

［実施例６］
実施例６では、まゆ形断面の螺旋トンネルを掘削するシールド掘進機の実施例６を、図１８，図１９を参照して説明する。掘削装置やエレクタ装置などの内部機構は説明を省略する。 [Example 6]
In Example 6, Example 6 of a shield machine that excavates a spiral tunnel having an eyebrows-shaped cross section will be described with reference to FIGS. 18 and 19. Description of internal mechanisms such as the excavator and the erector apparatus is omitted.

まゆ形断面のシールド本体９１は、前胴９２と後胴９３とを、螺旋軸Ｏｓを中心とする掘削トンネルの円弧線（内外周線）ＭＳｉ，ＭＳｏに内接するように、前中央横断面ＦＣＰおよび後中央横断面ＲＣＰでそれぞれ所定の折り曲げ角γで折り曲げて形成している。 The shield body 91 having an eyebrows-shaped cross section has a front central cross section FCP so that the front trunk 92 and the rear trunk 93 are inscribed in the arc lines (inner and outer circumference lines) MSi and MSo of the excavation tunnel centered on the helical axis Os. And the rear center cross section RCP is bent at a predetermined bending angle γ.

前胴８２は、まゆ形の直状断面の分割前胴９２ｆ，９２ｒを、内外周線ＭＳｉ，ＭＳｏに内接するように、所定の折り曲げ角γで溶接接合して形成している。また後胴９３も同様に、まゆ形の直状断面の分割後胴９３ｆ，９３ｒを、掘削トンネルの円弧線（内外周線）ＭＳｉ，ＭＳｏに内接するように所定の折り曲げ角γで溶接接合して形成している。 The front cylinder 82 is formed by welding and joining the front cylinders 92f and 92r of the eyebrow-shaped straight section at a predetermined bending angle γ so as to be inscribed in the inner and outer peripheral lines MSi and MSo. Similarly, the rear cylinder 93 is welded at a predetermined bending angle γ so that the rear cylinders 93f and 93r of the eyebrow-shaped straight section are inscribed in the arc lines (inner and outer lines) MSi and MSo of the excavation tunnel. Formed.

すなわち、まゆ形で直状断面の筒体により、所定寸法および形状の分割前胴９２ｆ，９２ｒおよび分割後胴９３ｆ，９３ｒをそれぞれ形成し、前後の分割前胴９２ｆ，９２ｒおよび分割後胴９３ｆ，９３ｒをそれぞれ折り曲げ角γで溶接接合して前胴９２と後胴９３を形成する。そして前胴９２と後胴９３を連結部７４で、所定の捻り角βで捻って連結固定しシールド本体９１を形成している。 That is, the cylinders 92f and 92r and the divided cylinders 93f and 93r having a predetermined size and shape are respectively formed by the eyebrows-shaped cylindrical body, and the front and rear divided cylinders 92f and 92r and the divided cylinder 93f, The front cylinder 92 and the rear cylinder 93 are formed by welding and joining 93r at bending angles γ. The front body 92 and the rear body 93 are twisted and fixed at the connecting portion 74 at a predetermined twist angle β to form the shield body 91.

図１８（ａ）（ｂ）は、シールド本体９１の連結部３１に、実施例４の部分削除面部７７または全周削除面部７８をそれぞれ形成したものである。
上記構成によれば、円弧状に製作するのが困難なまゆ形断面のシールド本体９１であっても、掘削トンネルに内接するようにまゆ形直状断面の分割前胴９２ｆ，９２ｒおよび分割後胴９３ｆ，９３ｒを折り曲げて接合することにより前胴９２と後胴９３を形成し、連結部３１で捻り角βだけ捻って連結固定することにより、まゆ形断面の螺旋トンネルを正立姿勢でスムーズに掘削することができる。また前胴９２および後胴９３を容易に製作することができ、製作コストおよび製作期間を削減することができる。 FIGS. 18A and 18B are obtained by forming the partial deletion surface portion 77 or the entire peripheral deletion surface portion 78 of the fourth embodiment on the connecting portion 31 of the shield body 91, respectively.
According to the above-described configuration, even if the shield body 91 has an eyebrows-shaped cross section that is difficult to manufacture in an arc shape, the split-front cylinders 92f and 92r and the post-separation cylinders have an eyebrows-shaped straight section so as to be inscribed in the excavation tunnel. The front barrel 92 and the rear barrel 93 are formed by bending and joining 93f and 93r, and the connecting portion 31 is twisted by a twist angle β to be connected and fixed, so that the spiral tunnel having a cross-section of the eyebrows is smoothly held in an upright posture. Can be excavated. Further, the front cylinder 92 and the rear cylinder 93 can be easily manufactured, and the manufacturing cost and the manufacturing period can be reduced.

また、連結部３１に部分削除面部７７または全周削除面部７８を形成することにより、前胴９２と後胴９３の外面を連続させることができ、掘進抵抗を減少させて螺旋トンネルＴｓをスムーズに掘削することができる。 Further, by forming the partial deletion surface portion 77 or the entire circumference deletion surface portion 78 in the connecting portion 31, the outer surfaces of the front cylinder 92 and the rear cylinder 93 can be made continuous, and the spiral tunnel Ts can be smoothly reduced by reducing the digging resistance. Can be excavated.

なお、上記実施例５および６では、各胴部について、折れ曲がり箇所を１箇所としているが、２箇所以上であってもよい。 In addition, in the said Example 5 and 6, although the bending location is made into one place about each trunk | drum, two or more places may be sufficient.

Ｔｓ螺旋トンネル
Ｏｓ螺旋軸
Ｏシールド軸心（掘削機軸心）
Ｓ螺旋経路
β 捻り角
Ｒ半径
α 勾配
θ 占有角
ＦＣＰ前胴中央断面
ＲＣＰ後胴中央断面
ＭＳｉ内周線
ＭＳｏ外周線
１１シールド本体
１２前胴
１３後胴
１４水平区画板
１５垂直区画板
１６掘削室
１７掘削装置
１８集荷排土コンベヤ
１９合流排土コンベヤ
２２推進ジャッキ
２３セグメント
３１連結部
２１エレクタ装置
３２前フランジ板
３３後フランジ板
３４連結ボルト
４１シールド本体
４２前胴
４３中胴
４４後胴
５１〜５５シールド本体
５１ｆ〜５５ｆ前胴
５１ｒ〜５５ｒ後胴
６４前胴拡張部
６５後胴拡張部
６６Ｆ，６６Ｒ増径面部
６７Ｆ，６７Ｒ削除面部
７１シールド本体
７２前胴
７３後胴
７４Ｆ前胴連結端面
７４Ｒ後胴連結端面
７５前胴拡張部
７６後胴拡張部
７７部分削除面部
７８全周削除面部
８１シールド本体
８２前胴
８３後胴
８２Ｕ，８３Ｕ上面プレート
８２Ｄ，８３Ｄ下面プレート
８２Ｉｆ，８２Ｉｒ、８３Ｉｆ，８３Ｉｒ分割内周面プレート
８２Ｏｆ，８２Ｏｒ、８３Ｏｆ，８３Ｏｒ分割外周面プレート Ts Spiral tunnel Os Spiral axis O Shield axis (excavator axis)
S spiral path β twist angle R radius α gradient θ occupation angle FCP front trunk central section RCP rear trunk central section MSi inner circumference MSo outer circumference 11 shield body 12 front trunk 13 rear trunk 14 horizontal partition plate 15 vertical partition plate 16 excavation chamber 17 Excavator 18 Collecting and Discharging Conveyor 19 Joint Discharge Conveyor 22 Propulsion Jack 23 Segment 31 Connecting Portion 21 Elector Device 32 Front Flange Plate 33 Rear Flange Plate 34 Connecting Bolt 41 Shield Main Body 42 Front Drum 43 Middle Drum 44 Rear Drum 51-55 Shield body 51f to 55f Front cylinder 51r to 55r Rear cylinder 64 Front cylinder extension 65 Rear cylinder extension 66F, 66R Increased surface area 67F, 67R Deletion surface 71 Shield body 72 Front cylinder 73 Rear cylinder 74F Front cylinder connection end surface 74R Rear cylinder Connection end surface 75 Front trunk extension part 76 Rear trunk extension part 77 Partial deletion surface part 78 Whole circumference deletion surface part 81 Shield Body 82 front body 83 after cylinder 82U, 83U top plate 82D, 83D underside plate 82If, 82Ir, 83If, 83Ir split inner circumferential surface plate 82Of, 82Or, 83Of, 83Or divided outer circumferential surface plate

Claims

A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector that assembles the lining body along the spiral tunnel at the rear is formed into an arc shape with the spiral axis as the center, and a plurality divided in front and rear. Composed of the body of
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
When excavating a spiral tunnel of a predetermined radius with an occupation angle of the spiral tunnel around the spiral axis: θ (rad) and a lead angle of the spiral tunnel: α (rad),
By setting the twist angle: β (rad) to β = tan ⁻¹ (θ × tan α), the front end surface of the front end barrel portion and the rear end surface of the rear end barrel portion are respectively spiral tunnels on the spiral path. A shield tunneling machine for spiral tunnel excavation, characterized in that it substantially matches the cross section.

A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector device for assembling the lining body along the spiral tunnel at the rear is composed of a plurality of trunks divided into a plurality of front and rear parts, and , Formed by a plurality of straight section split barrels bent at the middle so as to be inscribed in the spiral tunnel,
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
When excavating a spiral tunnel of a predetermined radius with an occupation angle of the spiral tunnel around the spiral axis: θ (rad) and a lead angle of the spiral tunnel: α (rad),
By setting the twist angle: β (rad) to β = tan ⁻¹ (θ × tan α),
A shield tunneling machine for spiral tunnel excavation, characterized in that the front end surface of the front end barrel portion and the rear end surface of the rear end barrel portion substantially match the spiral tunnel cross section on the spiral path.

A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector that assembles the lining body along the spiral tunnel at the rear is formed in an arc shape centered on the spiral axis, and is divided into three or more parts in the front and rear. multiple constituted by cylinder portions,
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
The torsion angle is set by the total circumference of the body parts before and after the connecting part or the ratio of the occupied angle around the spiral axis, where the circumference is the entire circumference of the body part at the end, The front of the front end of the front end and the rear end of the front end A shield tunneling machine for excavation of a spiral tunnel, characterized in that the rear end face of the end barrel part substantially matches the spiral tunnel section on the spiral path.

A shield tunneling machine for spiral tunnel excavation for excavating a spiral tunnel having a non-circular cross section along a spiral path with a predetermined gradient around a spiral axis,
A shield body having an excavator at the front and an erector device for assembling the lining body along the spiral tunnel at the rear is composed of a plurality of trunks divided into a plurality of front and rear parts, and , Formed by a plurality of straight section divided body parts that are bent at the middle part so as to be inscribed in the spiral tunnel and divided into three or more in the front and rear ,
When excavating a spiral tunnel by turning the front trunk with respect to the rear trunks adjacent to each other in the right and left direction toward the excavation direction, the right and left other are twisted at a predetermined twist angle and fixed and connected.
The torsion angle is set by the total circumference of the body parts before and after the connecting part or the ratio of the occupied angle around the spiral axis, where the circumference is the entire circumference of the body part at the end, The front of the front end of the front end and the rear end of the front end A shield tunneling machine for excavation of a spiral tunnel, characterized in that the rear end face of the end barrel part substantially matches the spiral tunnel section on the spiral path.

The connecting portion is formed with a body extension portion that protrudes from a matching portion between the connecting end surface of the front body portion and the connecting end surface of the rear body portion,
The outer surface of the connecting portion side of the front body portion and the rear body portion is provided with at least one of a deletion surface portion for deleting the body portion expansion portion and a diameter increasing surface portion continuous with the body portion expansion portion. Item 5. A shield tunneling machine for spiral tunnel excavation according to any one of Items 1 to 4.