JPS6217079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polygonal shield tunneling machine.

When building a polygonal tunnel underground, a shield tunneling machine with a polygonal outer shape can be used to perform the excavation.

In this case, unlike a circular shield excavator, the rolling that occurs for a while during excavation appears as an inclination of the tunnel, so some correction measures must be taken.

The present invention is a polygonal shield excavator that takes this countermeasure, and its gist is that a pressing plate that is extended to press the ground and a rolling correction jack are installed on at least two sides of the polygon. The shield tunnel excavator is installed on each of the shield excavators, and the jacks are appropriately extended to correct the rolling of the shield excavator to perform accurate tunnel excavation without inclination.

Furthermore, by actively utilizing this rolling correction jack, it is possible to control the direction of propulsion of the shield excavator and perform curved excavation.

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in FIG.
A circular normal diameter tunnel 2 is excavated while propelling a primary shield excavator 1 (detailed illustration is omitted) equipped with
Stretch it.

Next, several rings of the primary segment 4 stretched at one end of the planned expansion area 3 behind the primary shield tunneling machine 1 are removed from the inside of the tunnel, and the removed inner end is placed as shown in FIG. 1B. A circumferential shield excavator 7 is installed in a steel box 6 buried at the bottom of the circumference, and a circumferential shield excavator 7 is installed along the guide ring 5 in the circumferential direction while extending the jack 7a of the excavator. Excavation will be carried out and the launch base 8 will be constructed.

On the inner surface of this starting base 8, circumferential segments 9 made of steel and having an inward letter shape are installed in succession each time circumferential excavation is performed to prevent the collapse of the ground. Improving the ground by pouring chemicals etc. The inner diameter of the starting base 8 on which the circumferential segment 9 is stretched is enlarged so as to correspond to the circumscribed circle 12 of the enlarged shield excavator 11, as shown in FIG.

The expansion shield excavator 11 is located at this starting base 8.
The divided units brought into the tunnel are connected to each other by bolts (not shown) and assembled into a shield excavator having a rectangular outer shape and a circular inner shape. The shield tunneling machine 11, like a normal shield machine, has a cutting edge at the leading end and a tail at the rear end, and a jack 11c is attached to the inside of the intermediate skin plate.
Also, a guide ring 1 is provided inside the shield tunneling machine 11 for guiding the shield along the primary segment 4.
1d, and a sliding member or a sealing member (not shown) can be suitably mounted on the inner surface of this guide ring. Further, on each side of the outer part, there are rolling correction jacks 13, 14, 15, which have pressing plates that project and press the ground as described later.
16 are each attached so that they can be expanded and contracted.

Next, the expansion shield excavator 11 is moved to the starting base 8.
After adjusting the position using the rolling correction jack or other means so that there is no inclination within the circumferential segment 9, the front plate 9a of the circumferential segment 9 is removed and the circumferential segment 9 is propelled in the direction of the arrow, as shown in FIG.

Although the illustration of the initial propulsion situation is omitted,
First, the jack 11c is extended using the rear plate of the circumferential segment 9 and the ground in contact with it as a reaction force receiver, and the secondary shield segment 17 is added to the front each time while propelling one segment at a time.

In this case, if the reaction force receiver is insufficient, a reinforcing reaction force receiver using a diagonal member can be provided between the primary segment behind the starting base 8 and the newly installed secondary segment.

In this way, the expanding shield excavator 11 widens the outer area of the primary segment while the guide ring 11c is guided along the outer periphery of the primary segment 4 of the normal diameter tunnel 2 previously installed in front, and the widened portion The primary segments 4 that are stretched are removed one after another, and new secondary segments 17 are sequentially attached to the inner surface of the widened portion.

The work of attaching and detaching these segments is both performed by an erector device (not shown), and between the circumferential segment 9 and the secondary segment 17, and between the secondary segment 17 and the ground in contact with it. Backfilling is performed using mortar, etc.

If the enlarging shield excavator 11 tilts as shown in FIG. 4 while it is digging, the rolling correction jacks 13 mounted on the upper right and lower left of the shield excavator
16 are extended, and the ground in contact with the jack is pressed against the pressing plate 13a provided at the tip of the jack.
The tilt is corrected by pressing with 16a.
In particular, in this embodiment, since the construction method is such that the guide ring 11d of the expanding shield machine 11 is guided along the primary segment 4 stretched in the normal diameter tunnel 2, the above-mentioned modification can be performed very easily. In the case of a construction method in which an expanding shield excavator is connected to a primary shield excavator and is propelled almost simultaneously without applying a primary segment, similar rolling correction jacks may be attached to the upper and lower opposite sides as necessary. The tilt can be corrected in cooperation with the jerk.

It is also possible to detect these inclinations using a spirit level, and to control each of the rolling correction jacks based on the detected values. Moreover, by actively utilizing these rolling correction jacks, it is possible to perform isodirectional control, for example, by extending the right jack and curving the propulsion direction to the left.

In the above embodiment, an enlarged shield excavator was used as an example, but the present invention can also be applied to a case where the primary shield excavator that excavates only a normal diameter tunnel has a polygonal outer shape. In this way, the polygonal shield excavator of the present invention is equipped with an extendable and retractable rolling correction jack that is attached to at least one of two sides and has a pressing plate at the tip. This allows accurate polygonal tunnel excavation by appropriately correcting the inclination caused by rolling.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, and
The figure is an explanatory diagram showing the construction state of the expansion part for the launch base,
Fig. 2 is an explanatory diagram of the expansion shield excavator that will be assembled and installed at the starting base, Fig. 3 is an explanatory diagram of the widening work performed by the excavator, and Fig. 4 is an explanatory diagram showing the rolling correction state. Explanation of symbols, 1...Primary shield tunneling machine, 2...
...Normal diameter tunnel, 3... Expansion planned area, 4...
Primary segment, 5... Guide ring, 6... Steel box, 7... Circumferential shield excavator, 8...
Starting base, 9...Circumferential segment, 10...Base circumference area, 11...Expanding shield excavator, 12...Circumcircle, 13, 14, 15, 16... Rolling correction jack, 17... Secondary segment, 13
a, 16a...pressing plate.

Claims (1)

[Claims] 1. A polygonal shield characterized in that the outer shape of the shield is polygonal, and rolling correction jacks each having a pressing plate that extends and presses the ground are attached to at least one two sides of the polygonal shape. excavator.