JPS60238599A - Enlarging 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 Field of Industrial Application The present invention VI relates to an expansion shield advancement machine used for excavating an expanded portion in a tunnel excavation expansion method.

When expanding a tunnel excavated with a conventional shield tunneling machine,
Conventionally, the expanded section was excavated by manual shield excavation, or the entire section of the expanded section was simultaneously excavated using a shield excavator with a larger diameter than the shield excavator that excavated the existing tunnel. .

Problems to be Solved by the Invention For this reason, the former of the above-mentioned conventional examples is not only inefficient due to manual excavation, but also lacks safety, and furthermore, has insufficient mountain retaining and water-stopping properties. -! The latter had the problem of being a large-diameter shield machine, which was prone to collapse of the ground and lacked safety.

The latter type of octopus required a large propulsion jack to move the entire large-diameter excavator forward, and the problem was that the strength of the secondary segment that received the reaction force from this had to be increased. .

Means and operation for solving the problem A partial shield having a shape that divides this space into a large number of parts in the circumferential direction is provided in the donut-shaped space outside the primary segment wound around the existing tunnel, and this part A sliding box provided inside the shield so as to be slidable in the front-back direction, an auger provided inside the sliding box with an open front end and a sand discharge port at the rear end, and a 2-wheel drive unit that is wound around an enlarged excavation section. A large number of sets of partial excavation equipment each consisting of a propulsion jack that advances the partial shield to the next segment and a sliding jack that moves the sliding box back and forth with respect to the first partial shield are installed, and the inside of the donut-shaped space is Each site is designed to be partially excavated using a drilling rig.

Example Embodiments of the present invention will be described based on the drawings.

In the figure, 1 is an existing tunnel, and 2 is a primary segment wrapped around its inner peripheral wall. 3 is an enlarged tunnel, and 4 is a secondary segment wound around its inner circumferential wall.

Reference numeral 5 denotes an expanding shield tunneling machine according to the present invention, and this expanding shield tunneling machine 5 consists of a plurality of parts that are divided into a donut-shaped space between the outer peripheral surface of the primary segment 2 and the inner surface of the expanded tunnel 3 in the circumferential direction. Set of partial excavation equipment 6α.

It is composed of 6b, 6C, .

Each partial excavation device 6tL, 6b, 6c, . . . has an inner shield roller along the outer periphery of the primary segment 2.

A partial shield 1° consisting of an outer shield 6 along the inner surface of the enlarged tunnel 3, both side walls 9cL and 9b, a sliding box +1 fitted in this partial shield so as to be slidable in the front-rear direction, and this sliding box +1. Box] 1 has an auger 12 that is fully open at the front and takes in earth and sand from the front to the rear, a sliding jack 13 that slides the sliding box +1 in the front and back direction with respect to the partial shield, and a partial shield 1ot-2 segment 4
It consists of a propulsion jack 14 that moves the vehicle forward against the vehicle.

A liner I5 is interposed on each sliding surface between the partial shield 1o and the sliding box 11.

A seal 16 is interposed at the front end of each sliding surface.

Further, a soil discharge hose 17 is connected to a soil discharge port at the rear end of each auger 12 of the partial excavation device.

Each soil discharge hose 17 is connected to a soil boater 18.

The above-mentioned partial excavation devices 6α, 6b, 6C, . . .

Depending on the shape of the donut-shaped enlarged excavation part,
As shown in the figure, when one of the outer periphery and the inner periphery is eccentric with respect to the other, the cross-sectional shape differs depending on the position in the circumferential direction, but each structure is substantially the same. If the radial space of the donut-shaped enlarged excavation part is wide, use one auger.

If the space is narrow, install two small augers.

In the above configuration, each partial excavation device 6α.

The sliding boxes 11 of 6b, 6C, . . . are connected to the auger 12.
The excavation is propelled individually by driving and then extending the sliding jack 13. At this time, each excavated earth and sand passes through a hose 17 connected to the rear end of each auger 12, is supplied to the soil boater 1g, and is transported rearward by the soil boater 18.

Sliding box for each partial excavation device 6α, 6b, 6C,...! 1 is moved forward by the stroke of each sliding jack +3, and each partial excavation device 6α, 6b, 6c, .
The propulsion jacks 14 of... are extended to individually advance each partial excavation device 6α#6b+6'l... with respect to the secondary segment 4.

Effects of the Invention According to the present invention, the enlarged excavation portion of the existing tunnel 1 can be excavated by mechanical force, thereby increasing the excavation efficiency and safely.

It has good water-stop properties and can be excavated in the mountains. Further, after being individually excavated by the portion 1 bending devices 6α, 6b, 6C, . . . , each partial excavation device 6ff, 6b, 6C.

. . are propelled individually, the propulsive force at this time can be reduced, and therefore the strength of the secondary segment 40 that supports it can be reduced. Further, according to the present invention, the enlarged excavation portion is connected to each partial excavation device 6α, bb, bc,
By excavating at ..., it is possible to excavate without disturbing the ground significantly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view;
Figure 2 is the front view, Figure 3 is the rear view, Figure 4 is the W of Figure 2.
Figure 1 is a cross-sectional view taken along line - ■, Figure 5 is a cross-sectional view showing the installation of the sliding jack, South part 6 is a cross-sectional view taken along line M-W in Figure 5, and Section 7 shows the enlarged excavation state. FIG. 1 is the tunnel, 2 and 4 are segment %6α. 6b, 6C, . . . are partial excavation devices, 10 is a partial shield, 11 is a sliding box, 12 is an auger, 13 is a sliding jack, and 14 is a propulsion jack. Applicant Komatsu Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto Figure 2 Figure 3

Claims (1)

[Claims] In a donut-shaped space outside the primary segment 2 wound around the existing tunnel 1, there is a partial shield 1o having a shape that divides this space into a large number of pieces in the circumferential direction, and this partial shield. Sliding box 1 provided in 1o so as to be slidable in the front and back direction
1, an auger 12 which is provided in the sliding box 11 and has an open front end and a dirt discharge port at the rear end, and a secondary segment 4 that is wound around the enlarged excavation part, and the partial shield 10 is advanced. Multiple sets of partial excavation equipment consisting of a propulsion jack 14 and a sliding jack 13 that moves the sliding box 11 back and forth with respect to one partial shield 1o.
α, 6b. An expanding shield excavator characterized by having 6c, . . .