JP2726768B2 - Tunnel excavation method and tunnel excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavation method and a tunnel excavator for continuously performing a tunnel excavation operation.

[0002]

2. Description of the Related Art The structure of a conventional tunnel excavator will be described with reference to FIG. An excavator 2 is attached to the front end of the tunnel excavator main body 1, and the excavator 2 swings to excavate a tunnel at a mountain face. The rod 3a of the slide jack 3 is connected to the center of the tunnel excavator body 1, and the excavator 2 is slid back and forth to excavate the entire cross section so as to have a stable face shape. The excavated earth and sand is loaded on the belt conveyor 5 by the scraping device 4 and carried out of the tunnel excavator body 1. In the figure, reference numeral 6 denotes a propulsion jack for propelling the tunnel excavator body 1, and reference numeral 7 denotes a segment.

Next, a method of propelling the tunnel excavator body 1 will be described with reference to FIGS. First, as shown in FIG. 6, the excavator 2 oscillates and excavates the face mountain 8. When the excavation is completed, next, as shown in FIG. 7, the slide jack 3 is contracted and the excavator 2 is retracted, and at the same time, the tunnel excavator body 1 is propelled by the propulsion jack 6 with the segment 7 as a reaction force receiver. FIG. 8 shows a state in which the propulsion of the tunnel excavator body 1 has been completed.

[0004]

The above-described conventional tunnel excavation method has the following problems. That is, conventionally, after excavating the entire cross section of the tunnel by the excavator 2, the tunnel excavator body 1 is propelled together with the excavator 2, but in this method, the excavator 2 is propelled during propulsion.
And the relative position between the face and the mountain face 8 changes. Therefore, excavation work and propulsion work cannot be performed in parallel,
The construction will be discontinuous.

[0005] The present invention has been made in view of the above situation,
It is an object of the present invention to provide a method and a mechanism for propelling a tunnel excavator body 1 while performing excavation work by an excavator 2.

[0006]

Therefore, in order to solve this problem, the present invention provides a method for excavating a tunnel while moving an excavator in the anti-propulsion direction at the same speed as the propulsion speed of a tunnel excavator body. In a tunnel excavator equipped with a tunnel excavation method and a propulsion jack for propelling a tunnel excavator body, which is equipped with a propulsion jack for propelling a tunnel excavator body by using a tunnel excavation method and a slide jack, the excavation device is synchronized with the propulsion jack. A tunnel excavator is characterized in that a telescopic jack for moving in a propulsion direction is connected to the slide jack via a guide frame.

[0007]

After excavating the outer peripheral portion of the cut face ground with a drilling device, the excavating body is propelled by operating the propulsion jack using the segment as a reaction force while excavating the inner peripheral portion. When the tunnel excavator body is propelled, the propulsion jack and the telescopic jack are extended at the same speed, and the excavator performing the excavation is pulled backward through the guide frame. As a result, even during propulsion of the tunnel excavator body, the excavator is held at the position at the time of propulsion start.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described with reference to the drawings. In the description of the embodiments, the same members as those in the above-described conventional example are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 shows a vertical section of an embodiment of a tunnel excavator according to the present invention, and FIGS. 2 to 4 show the propulsion procedure in the embodiment.

In FIG. 1, reference numeral 9 denotes a telescopic jack,
The base is fixed to the tunnel excavator body 1 and its rod 9
The tip of “a” is connected to the guide frame 10. Further, the rod 3 a of the slide jack 3 is connected to the guide frame 10 instead of the tunnel excavator body 1. That is, the excavator 2 is connected to the tunnel excavator body 1 via the slide jack 3, the guide frame 10, and the telescopic jack 9.

The operation of this embodiment will be described below with reference to FIGS. In this embodiment, first, as shown in FIG.
The outer peripheral portion of the mountain face 8 is excavated by the excavator 2. Then, as shown in FIG. 3, the excavator 2 is moved back and forth by the slide jack 3 to excavate the central portion of the cutting face ground 8 into a stable face shape, while the segment 7 is used as a reaction force receiver by the propulsion jack 6. The tunnel excavator body 1 is propelled. At this time, the telescopic jack 9 extends at the same speed as the extension speed of the propulsion jack 6, and the guide frame 10
Is moved backward. As a result, the position of the tip of the rod 3a of the slide jack 3 does not change from the start of propulsion, and the excavator 2 can perform excavation without being affected by the propulsion state of the tunnel excavator body 1. FIG. 4 shows a state in which the propulsion of the tunnel excavator body 1 has been completed.
To the initial position.

[0012]

According to the present invention, since the tunnel excavator body can be propelled while excavating the face mountain by the excavator, the efficiency of tunnel construction is improved and the construction period can be shortened. To play.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a tunnel excavator according to the present invention.

FIG. 2 is an explanatory view showing a tunnel construction state in the embodiment.

FIG. 3 is an explanatory view showing a tunnel construction state in the embodiment.

FIG. 4 is an explanatory view showing a tunnel construction state in the embodiment.

FIG. 5 is a longitudinal sectional view showing an example of a conventional tunnel excavator.

FIG. 6 is an explanatory view showing a conventional tunnel construction state.

FIG. 7 is an explanatory view showing a conventional tunnel construction state.

FIG. 8 is an explanatory view showing a conventional tunnel construction state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel excavator main body 2 Drilling rig 3 Slide jack 6 Propulsion jack 7 Segment 8 Face ground mountain 9 Telescopic jack 10 Guide frame

Continued on the front page (72) Inventor Mitsuhiro Suenaga 484-1 Kodani-cho, Ryugasaki Kodori, Ibaraki Pref. Keisuke Chiba 2-5-3 Misaki-cho, Chiyoda-ku, Tokyo Within Tekkoken Construction Co., Ltd. (72) Inventor Junichi Tanaka 1-1-1, Wadazaki-cho, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-52-4628 (JP, A) −138433 (JP, U)

Claims (2)

(57) [Claims] 1. A tunnel excavation method, wherein a tunnel is excavated while moving an excavator in an anti-propulsion direction at the same speed as the propulsion speed of a tunnel excavator body. 2. A tunnel excavator equipped with a propulsion jack for propelling a tunnel excavator body, mounted with an excavation device that moves in a front-rear direction by a slide jack, wherein the excavation device is moved in anti-propulsion direction in synchronization with the propulsion jack. A tunnel excavator, characterized in that a telescopic jack for moving the slide jack is connected to the slide jack via a guide frame.