JPS6149098A - Oval shield drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application The present invention relates to an elliptical shield excavator suitable for use when excavating a tunnel or the like having an elliptical cross section by a shield method.

(b), Prior Art FIG. 3 is a front view showing a conventional shield excavator, and FIG. 4 is a side view of FIG. 3.

Conventionally, most of the tunnels excavated by the shield excavator 7 have a circular cross section, so the cross section is elliptical (here, "ellipse" is not a strict ellipse in the mathematical sense). , ``Oval'', ``Irregular Ellipse'', etc., which are not ``perfect circles'' but ``elongated circles''.Of course, it also includes ``ellipses'' in the strict mathematical sense.) There are no shield excavators capable of excavating tunnels, and most of them have a cylindrical shield shell 1 and a circular cutter 2 facing in the direction of excavation propulsion, as shown in Figures 3 and 4. T-ko.

(C)0 Problems to be Solved by the Invention However, recently there has been a strong demand for tunnels with an elliptical cross section, and there is a desire for the development of a shield excavator that can excavate such elliptical tunnels using the shield method.

In view of the above circumstances, an object of the present invention is to provide an elliptical shield excavator that can easily excavate a tunnel having an elliptical cross section by a shield construction method.

(d) Means for solving the zero problem, that is, the present invention has an outer shell formed in an elliptical shape when viewed from the front in the direction of excavation progress, and a guide means is provided at the outer edge of the outer shell as the excavation progresses. The cutter is formed into an elliptical shape when viewed from the front, and a circular cutter is provided on the outer shell so as to be freely rotatable in the direction of excavation propulsion, and a plurality of slide cutters are pivotally attached to the cutter, and further the slide cutters are attached to the cutter. It is configured to be movably engaged with the guide means.

(e) 0 effect With the above configuration, the present invention allows the circular cutter to excavate in a circular manner, and the slide cutter to excavate between the circular cutter and the oval outer shell to excavate a tunnel having an oval cross section. act.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing an embodiment of an elliptical shield excavator according to the present invention, and FIG. 2 is a side view of FIG. 1.

As shown in FIGS. 1 and 2, the elliptical shield excavator 3 has an outer shell 1 that is oval in shape when viewed from the left in FIG. 2, which is the front in the direction of excavation propulsion. An elliptical slide groove 1b is formed on the outer edge of the excavation direction. A circular cutter 2 with a plurality of cutting blades 2d provided on the digging surface 2c is provided on the front face of the outer shell 1 in the direction of excavation propulsion, and is rotatably driven around a shaft 2b. A plurality of rod-shaped slide cutters 5 are provided with one end pivotally connected via a pin 2a. As shown in FIG. 2, the slide cutter 5 has an engaging portion 5a formed in a bent manner, and the retaining portion 5a has its tip fitted into the slide groove 1b and engaged therewith. It is provided so as to be movable along the slide groove 1b.

Since the elliptical shield excavator 3 has the above configuration, when the elliptical shield excavator 3 excavates a tunnel 6 having an oval cross section, the excavation surface 2c of the cutter 2 is directed in the excavation direction of the tunnel 6. Then, the cutter 2 is rotated in the direction of arrow A. At this time, when a predetermined excavation pressure is applied to the outer shell 1 in the direction of arrow B, which is the excavation direction of the tunnel 6, by a hydraulic jack or the like (not shown), the face 6a of the tunnel 6 is excavated by the rotating cutter 2. When the cutter 2 rotates, the slide cutter 5 provided on the outer periphery of the cutter 2 is also dragged by the rotation of the cutter 2 in the A direction, and its engaging portion 5a
starts moving in the direction A within the slide groove 1b. Since the slide cutter 5 freely rotates around the bin 2a relative to the cutter 2, the slide cutter 5 connects the cutter 2 to the slide groove in a manner that continuously changes the installation angle a relative to the cutter 2 as the cutter 2 rotates. 1b. Then, the cutter 2 excavates the face 6a in a circular shape, and the area between the cutter 2 and the outer edge of the outer shell 1 is excavated by the swinging slide cutter 5, and the tunnel 6 is excavated so that its cross section is elliptical. In this way, when the cutter 2 and the slide cutter 5 continue to excavate while moving the outer shell 1 in the direction B, a tunnel 6 having an oval cross section is formed.

(g) 0 Effects of the Invention As explained above, according to the present invention, the outer shell 1 has an elliptical shape when viewed from the front in the excavation propulsion direction, and slides on the outer edge of the outer shell 1. The guide means such as the groove 1b is formed in an elliptical shape when viewed from the front in the excavation propulsion direction, and a circular cutter 2 is provided on the outer shell 1 so as to be freely rotatable in the excavation propulsion direction, and the cutter 2 has a plurality of slides. Since the cutter 5 is pivotally mounted and the slide cutter 5 is movably engaged with the guide means, when the cutter 2 rotates, the slide cutter 5 is also guided by the guide means. The cutter 2 moves between the outer edge of the outer shell 1 and the outer edge of the outer shell 1.
Since the slide cutter 5 excavates between the circular cutter 2 and the oval outer shell, it is possible to easily excavate a tunnel 6 with an oval cross section by the shield method, which is similar to the recent tunnels with an oval cross section. It becomes possible to provide an elliptical shield excavator 3 that can meet excavation requests.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of an elliptical shield (cutting machine) according to the present invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a front view showing a conventional shield excavator, and Fig. 4 is a side view of Fig. 3. 1 Outer shell 1b Guide means (slide groove) 2 Cutter 3 Oval shield excavator 5 Slide cutter applicant Mitsui Construction Co., Ltd. agent Patent attorney Phase 1) Shinji 71

Claims (1)

[Scope of Claims] It has an outer shell formed in an elliptical shape when viewed from the front in the excavation propulsion direction, and a guide means is formed in an elliptical shape when viewed from the front in the excavation propulsion direction at the outer edge of the outer shell, A circular cutter is provided on the outer shell so as to be rotatably driven in the excavation propulsion direction, and a plurality of slide cutters are pivotally attached to the cutter,
The elliptical shield excavator further comprises a slide cutter movably engaged with the guide means.