JPH078632Y2 - 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) Conventionally, when constructing underground tunnels such as roads, railways, tunnels for water and sewage, and underground malls, underground parking lots, etc. with earth pressure system shield excavators, the excavated earth and sand is taken into the face pressure chamber. And various treatments are applied depending on the formation.

For example, when the ground is a sandy soil layer such as a sand layer or a gravel layer, the excavated soil is injected with a mud material such as bentonite or a CMC aqueous solution and mixed by a kneading blade in the face pressure chamber. , The unit weight is almost the same as the ground of the cutting face, and the mud has plasticity and impermeability at the same water content ratio.

In addition, when the ground is a cohesive soil layer such as a silt layer or a clay layer, the above-mentioned mud material, or a surfactant or water is injected into the excavated earth and sand, and the mixture is kneaded with a kneading blade. Similarly, make mud of the same level as the natural ground. Then, the earth and sand subjected to various treatments by these strata are discharged from the face earth pressure chamber by the screw conveyor.

(Problems to be solved by the invention) However, in the case of making mud as described above, in the conventional shield excavator, the kneading blade for kneading the excavated earth and sand has the same rotation speed as the cutter, and the rotation speed is small, and Due to the large volume of the face soil pressure chamber, there was a problem that the intended mixing effect, that is, the same level of mud as that of the face face ground was not obtained.

The present invention has been made in view of the above problems, and its purpose is to provide a mixing effect intended by excavated earth and sand, that is, a plastic fluidity having a unit weight similar to that of a cutting ground and a similar water content ratio. And it is to provide a shield machine with which mud with impermeability can be obtained arbitrarily.

(Means for Achieving the Object) The means for achieving the above object is a cylindrical basket-shaped structure in which a disk and a ring are connected by spokes on both sides of a gear case provided on the front surface of a shield frame. Install the drum cutter so that its rotation axis is horizontal with the direction of excavation,
Between these drum cutters, a cylindrical basket-shaped ring cutter with a smaller diameter than the drum cutter and with opposed rings connected by spokes, so that the excavation surface is flush with the excavation surface of the drum cutter. It is characterized in that a pair of upper and lower is provided, cutter bits are respectively projected on the surface of the spokes of the drum cutter and the ring cutter, and the tip of the mud material injection pipe faces the inside of the drum cutter.

(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, and the drum cutter and the ring cutter rotate to exert the stirring performance. The required mud is made by stirring and kneading together with the mud material injected from the mud material injection pipe.

(Embodiment) An embodiment of the present invention will be described below in detail 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 the shield frame 1.
Are provided so as to be orthogonal to each other in the horizontal direction with respect to the direction of excavation.

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 whose tip is branched into two is projectingly provided at the front part of the partition wall 5, and a cylindrical basket-shaped drum cutter 2 is rotatably provided by a shaft 2d on both sides of the branched gear case 6. .

A cylindrical basket-shaped ring cutter 3 having a diameter smaller than that of the drum cutter 2 is provided between the drum cutters 2 so that the excavation surface is flush with the excavation surface of the drum cutter 2. There is.

A screw conveyor C whose front end faces the rear portion of the drum cutter 2 is provided below the partition wall 5.

The drum cutter 2 is formed into a cylindrical basket by connecting a disc 2a arranged on the outer side and a ring 2b arranged on the inner side of the disc at appropriate intervals with a spoke 2c, and the spoke 2c is the disc 2a. And, a large number of openings 7 are continuously formed in the drum surface 2e by being installed at appropriate intervals along the periphery of the ring 2b, and a cutter bit 8 is protrudingly provided on the upper surface of each spoke 2c. .

The ring cutter 3 has a smaller diameter than the drum cutter 2.
3a, 3a are connected by the spokes 3b to form a cylindrical basket shape,
By arranging the spokes 3b along the peripheral edges of the rings 3a, 3a at appropriate intervals, a large number of openings 7 are continuously formed on the ring 3c surface similarly to the drum cutter 2, and the spokes 3b of each spoke 3b are formed. A cutter bit 8 is provided on the upper surface.
A pair of ring cutters 3 are provided between the drum cutters 2 via shafts 3d provided above and below the shaft 2d of the drum cutter 2 in the gear case 6, and have a diameter substantially the same as the diameter of the drum cutter 2 as shown in FIG. A pair of upper and lower digging surfaces are provided so that the digging surface is flush with the digging surface of the drum cutter.

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.

The power transmission mechanism 9 is, as shown in FIG.
And a bevel gear 12 fixed to the output shaft 11 of the speed reducer 10 and various other gears 13 ..., 14a, 14b.

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

The gear 12c is made up of various other gears 13 ..., 14a, 14
It is connected to the gear 2f of the shaft 2d of the drum cutter 2 which is rotatably supported by the gear case 6 via b.

Further, the gear 2f of the shaft 2d of the drum cutter 2 is a gear of the shaft 3d of the ring cutter 3 rotatably supported by the gear case 6 via the other gears 14a and 14b arranged vertically.
It is linked to 3e.

The gear case 6 is arranged between the drum cutters 2 and fixed to the partition wall 5 with sufficient strength.

A muddy material injection pipe 15 penetrating the inside of the gear case 6 is connected to the inside of the drum cutters, and a pump P (not shown) for injecting the muddy material into the drum cutter m is connected to these muddy material injection pipes 15. ) Is provided for each drum cutter 2 and ring cutter 3
Sealing members (not shown) for preventing the intrusion of muddy water are provided on the rotating shafts of the respective.

When the motor M is driven, the various gears 13 ... 14
The tunnel cutter having a rectangular cross section is excavated by propelling the shield machine A while simultaneously rotating the drum cutter 2 and the ring cutter 3 in the same direction, that is, the counterclockwise direction, via a and 14b.

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

First, by driving the motor M to rotate the bevel gears 12 and 12a, the rotation of the bevel gears 12 and 12a is transmitted to the shaft 2d of the drum cutter 2 via the gear 12c at the center of the shaft 12b and other various gears 13, .... It transmits and rotates the drum cutter 2. And the rotation of this drum cutter 2 is a gear
It is transmitted to the ring cutter 3 via the other gears 14a and 14b above and below 2f.

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

The earth and sand excavated by the drum cutter 2 and the ring cutter 3 are taken into the respective drum cutters and ring cutters through the respective openings 7, and the sludge is injected into the drum cutters and ring cutters by a mud material injection pipe 15. The material is poured.

Then, the drum cutter 2 and the ring 3 rotate to exert stirring performance, whereby the sand and the mud material are stirred and kneaded to produce a required mud, and the mud is discharged to the outside of the tunnel by the screw conveyor C. To be done.

In the above embodiment, the drum cutter 2 and the ring cutter 3
Are formed so as to be orthogonal to the propulsion direction in the horizontal direction, but the present invention is not limited to this, and it is also possible to form in a state perpendicular to the excavation direction. Further, in the above-described embodiment, the single excavating cutter including the drum cutter 2 and the ring cutter 3 is used, but the present invention is not limited to these, and a plurality of upper and lower excavating cutters may be provided, and it is orthogonal to the excavation direction. It may be formed in any state, and the rotation direction is not limited to counterclockwise rotation, but may be rotated clockwise.

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.

A cylindrical basket-shaped drum cutter, in which a disk and a ring are connected by spokes, is provided on both sides of a gear case provided on the front surface of the shield frame so that its rotation axis is horizontal to the excavation direction. In between, a pair of cylindrical cage-shaped ring cutters having a diameter smaller than that of the drum cutter and opposed rings connected by spokes are provided vertically so that the excavation surface is flush with the excavation surface of the drum cutter. Cutter bits are projected on the surface of the spokes of the drum cutter and the ring cutter, respectively, and the tip of the mud material injection pipe faces the inside of the drum cutter, so that a rectangular or axisymmetric tunnel of arbitrary cross section is constructed. In addition to being able to do so, the effect of stirring and kneading can be enhanced more than in the conventional case, so that it is possible to give arbitrary water-stopping property and fluidity to the excavated earth and sand.

By mixing the excavated soil with sufficient stirring to create a homogeneous mud, it is possible to stabilize the discharge of sediment such as the reduction of the load on the equipment and the prevention of jetting.

By forming the drum cutter and the ring cutter in the shape of a cylindrical basket and providing the cutter bit in a protruding manner on the upper surface of the spoke, it is possible to reduce the adhesion of cohesive soil to the drum surface and the ring surface.

It is possible to fill the space between the partition wall and the ground face face and the gear case with sand and to stabilize the face face by generating earth pressure opposite to the face earth pressure by controlling the rotation speed of the screw.

[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, 2a: Disc 2b: Ring, 2c, 3b: Spoke 3: Ring cutter, 3a, 3a: Ring 8: Cutter bit 15: Additive injection pipe Is.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-117998 (JP, A) JP-A-62-10398 (JP, A) JP-A-61-72194 (JP, A) JP-A 64-- 52995 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A cylindrical basket-shaped drum cutter, in which a disk and a ring are connected by spokes, is provided on both sides of a gear case provided on the front surface of a shield frame so that its rotation axis is horizontal with the direction of excavation. Between these drum cutters, a cylindrical basket-shaped ring cutter with a smaller diameter than the drum cutter and with opposed rings connected by spokes, so that the excavation surface is flush with the excavation surface of the drum cutter. A shield excavator characterized in that a pair of upper and lower is provided, cutter bits are respectively projected on the surfaces of the spokes of the drum cutter and the ring cutter, and the tip of the mud material injection pipe faces the inside of the drum cutter.