JPH07549Y2 - Shield machine - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Use) The present invention is a shield used for constructing underground roads, railways, tunnels such as water and sewerage, and underground spaces such as underground malls and underground parking lots. It concerns excavators.

(Prior art) Effectiveness of cross section as shown in Japanese Patent Application No. 63-218194 as a method for constructing underground roads, railways, tunnels such as water and sewers and underground spaces such as underground shopping streets and underground parking lots. A method of excavating in a rectangular shape has been proposed for the purpose.

(Problems to be solved by the invention) However, in the shield machine as described above, the earth and sand excavated by the cylindrical cutter are taken into the pressure chamber, but the earth and sand are pressed only by such a cylindrical cutter. Since it was difficult to take it into the chamber and the bottom of the pressure chamber was flat, there was a problem that sediment would easily accumulate.

Further, in rocky grounds such as loose sand layers and gravel layers that tend to collapse, it is not possible to mechanically press the rocks above the cylindrical cutter after excavation, which causes a problem of collapse.

The present invention has been made in view of the above problems, and the purpose thereof is to easily take in earth and sand excavated by a cutter into a pressure chamber,
Moreover, it is an object of the present invention to provide a shield machine in which the earth and sand can be easily discharged from the pressure chamber to the outside of the tunnel without accumulating, and the collapse of the ground can be mechanically suppressed.

(Means for Achieving the Object) The means for achieving the above object is to provide a gear case projecting on the front surface of a shield frame with a cylindrical drum cutter whose one surface is closed and whose rotary shaft is driven. A cylindrical ring cutter with a smaller diameter than the drum cutter is placed between these drum cutters so that the excavation surface is flush with the drum cutter. The upper and lower sides of the drum cutter and the ring cutter are provided with sand inlets equipped with cutter bits at appropriate intervals on the excavated surface of the drum cutter and ring cutter, and the tips of the mud pipe and the mud pipe are placed inside the drum cutter or in the pressure chamber. It is characterized by facing.

(Operation) According to the above configuration, the earth and sand excavated by the drum cutter and the ring cutter are taken into the drum cutter and the ring cutter from the earth and sand intake, and the earth and sand are easily discharged out of the tunnel by the mud pipe. It

In addition, the excavation surface of the drum cutter and the ring cutter can mechanically press the face of the cutting ground immediately after excavation.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of the shield machine A, in which a drum cutter 2 and a ring cutter 3 are provided on the front surface of a shield frame 1.

Further, a shield jack 4 for controlling the propulsion and excavation of the shield machine A is provided at the rear part of the shield frame 1, and a partition wall 5 is formed at the front part.

A gear case 6 is fixed to the front side of the partition wall 5, and a drum cutter 2 is provided on a rotary shaft 2b rotatably provided on both sides of a tip end of the gear case 6, and a drum cutter 2 is vertically arranged between the drum cutters 2. A pair of ring cutters 3 are rotatably provided in the.

The drum cutter 2 has a cylindrical shape with the outer side closed, and the tip of the gear case 6 which is branched into two is inserted into the opening of one side surface, and the excavated surface 2a is perforated with the earth and sand inlets 7 at appropriate intervals. A cutter bit 8 is provided at the earth and sand intake 7.

The cutter bit 8 is a drum cutter 2 and a ring cutter 3
By being provided on the side surface 7a of the earth and sand inlet 7, the excavated earth and sand can be easily taken into the drum cutter 2 from the earth and sand inlet 7, and the excavated surface 2a of the drum cutter 2 and the excavated surface 3a of the ring cutter 3 can be used as a cutting face. The ground surface can be pressed immediately after cutting.

The ring cutters 3 are cylindrical and have a smaller diameter than the drum cutter 2, and a pair of upper and lower ring cutters 3 are provided between the drum cutters 2 so that the excavation surface 3a is flush with the excavation surface 2a of the drum cutter 2.

Further, the excavated surface 3a is provided with a sediment intake port 7 like the drum cutter 2, and the sediment intake port 7 is provided with a cutter bit 8.

A motor M is provided on the rear side of the partition wall 5, and the rotational force of the motor M is transmitted to the drum cutter 2 and the ring cutter 3 via the power transmission mechanism 9 in the gear case 6.

As shown in FIG. 1, the power transmission mechanism 9 has a gear case 6
And a bevel gear 12 fixed to the output shaft 11 of the reduction gear 10 and various other gears 13 ..., 14 ...

The bevel gear 12 meshes with another bevel gear 12a fixed to both ends of the rotating shaft 12b, and a gear 12c is fixed to the center of the rotating shaft 12b.

The gear 12c is rotatably supported by the gear case 6 via various other gears 13, ...
Is connected to the gear 2c of the rotating shaft 2b.

The gear 2c of the rotary shaft 2b of the drum cutter 2 is a gear of the rotary shaft 3b of the ring cutter 3 which is rotatably supported by the gear case 6 via other gears 14a, 14b arranged vertically.
It is linked to 3c.

Further, the gear case 6 is arranged between the drum cutters 2 and includes the pair of ring cutters 3, so that the gear case 6 is fixed to the partition wall 5 with sufficient strength.

When the motor M is driven, the various gears 13 ...
The drum cutter 2 and the ring cutter 3 simultaneously rotate in the same direction, that is, the counterclockwise direction, via a and 14b.

Further, a mud feed pipe 15 and a mud feed pipe 16 penetrating the inside of the gear case 6 are respectively communicated with the drum cutter inside m, and the mud feed pipe 15 and the mud feed pipe 16 are fed into the drum cutter inside m. And a pump P for removing sludge from the drum cutter m.

Further, the sludge discharge pipe 16 is provided with a sludge discharge chamber 16a.

A seal member (not shown) that prevents the entry of muddy water is provided on the rotary shafts of the drum cutters 2 and the ring cutters 3.

Thus, by propelling the shield machine A while rotating the drum cutter 2 and the ring cutter 3, a tunnel having a rectangular cross section can be excavated.

Next, the operation of the shield machine A according to the present invention will be described.

First, a pump P (not shown) feeds mud from the mud feed pipe 15 into the drum cutter m to maintain the face water pressure, and drives the motor M to rotate the bevel gears 12 and 12a.

The bevel gears 12 and 12a are rotated by a gear 12c at the center of the rotating shaft 12b.
Also, the drum cutter 2 is rotated by being transmitted to the rotary shaft 2b of the drum cutter 2 which is rotatably supported by the gear case 6 via various gears 13 ,.

Then, the rotation of the drum cutter 2 is caused by rotation of the other gears 14a, 14b.
Is transmitted to the ring cutter 3 via.

As a result, the drum cutter 2 and the ring cutter 3 rotate in the counterclockwise direction (direction of arrow B) in FIG. 3 to excavate the natural ground with the cutter bit 8 to excavate a rectangular tunnel.

Then, the earth and sand excavated by the drum cutter 2 and the ring cutter 3 are taken into the insides m of the respective drum cutters through the respective earth and sand inlets 7 and discharged into the sludge discharge chamber 16a by the sludge discharge pipes 16 in the respective drum cutters m. The mud is discharged from the mud discharge chamber 16a to the outside of the tunnel by a pump (not shown).

In this case, as shown in FIG. 3, the ring cutter 3 is arranged so that the diameter of the ring cutter 3 can be approximately the same as the diameter of the drum cutter 2.

Further, it is also optional to provide a front surface portion from the partition wall 5 as a pressure chamber R, and to install a mud feeding pipe 15 and a mud drain pipe 16 in the partition wall. The mud feeding pipe 15 sends mud to the pressure chamber R to increase the face water pressure. The cutting ground is excavated while maintaining, and the excavated earth and sand is discharged to the outside of the tunnel by the mud pipe 16.

In the above embodiment, the drum cutter 2 and the ring cutter 3 are formed so that their rotation shafts 2b and 3b are horizontal with respect to the excavation direction. However, the present invention is not limited to this, and they may be formed perpendicular to the excavation direction. Is. Further, in the above-mentioned embodiment, the single excavating cutter composed of the drum cutter 2 and the ring cutter 3 is used, but the present invention is not limited to this and a plurality of upper and lower cutters may be provided. The direction of rotation is also free.

As a result, it becomes possible to excavate a large tunnel having a rectangular cross section.

(Effect of the Invention) The present invention has the following effects by having the above-mentioned configuration.

On the gear case protruding from the front of the shield frame,
Cylindrical drum cutters whose one surface is closed are provided with appropriate intervals so that their rotation axes are horizontal with the direction of excavation, and between these drum cutters, there is a cylindrical ring cutter with a smaller diameter than the drum cutter. The excavation surface is provided as a pair up and down so as to be in the same plane as the excavation surface of the drum cutter, and the excavation surfaces of these drum cutters and ring cutters are provided with earth and sand inlets with cutter bits at appropriate intervals, While excavating a tunnel with a rectangular cross section,
The excavated surface of the drum cutter and the ring cutter can press the cutting surface directly after cutting.

Sediment intakes are provided at appropriate intervals on the excavated surface of the drum cutter and ring cutter, and a cutter bit is provided at this sediment intake, so that the excavated sediment can be easily taken into the drum cutter and ring cutter from the sediment intake. be able to.

By exposing the tip of the mud discharge pipe and the mud feed pipe to the drum cutter or the pressure chamber, the earth and sand taken into the drum cutter and the ring cutter can easily go out of the tunnel without accumulating in them. Can be discharged.

[Brief description of drawings]

1 is a sectional view of the shield machine of the present invention, FIG. 2 is a sectional view taken along the line I-I of FIG. 1, FIG. 3 is a sectional view taken along the line II-II of FIG. 1, and FIG. 4 is a perspective view. Is. In the figure, A: Shield excavator 1: Shield frame 2: Drum cutter, 3: Ring cutter 7: Sediment intake, 8: Cutter bit 15: Mud pipe, 16: Mud pipe.

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Claims (1)

[Scope of utility model registration request] 1. A gear case projecting from a front surface of a shield frame is provided with cylindrical drum cutters, one surface of which is closed, at appropriate intervals such that its rotation axis is horizontal to the excavation direction. A pair of cylindrical ring cutters with a smaller diameter than the drum cutter are installed between the top and bottom so that the excavation surface is flush with the excavation surface of the drum cutter. A shield machine, characterized in that the sediment inlets provided with bits are provided at appropriate intervals, and the tips of the mud pipe and the mud pipe face the inside of the drum cutter or the pressure chamber.