JPH053595Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an excavation device for excavating earth and sand at the tip of a hollow box-shaped element that is press-fitted into the soil by an excavator.

``Conventional technology'' Conventionally, in the excavation method for excavating tunnels that cross under railroad tracks, roads, etc., multiple excavation devices are press-fitted perpendicularly to the ground on which the tunnel is being constructed, and are used to drill the inner wall of the tunnel. It is used when excavating the ground inside a hollow box-shaped element used as a constituent lining. Such a drilling device has a structure as shown in FIGS. 2 and 3, for example. That is, a casing 2 that forms an earth and sand discharge path is inserted into a hollow box-shaped element 1 that is pressed by an excavator, and earth and sand are excavated with two sets of cutters 3 provided at the tips of this casing 2. The excavated earth and sand is discharged by a screw conveyor 4 inside the casing 2 from the distal end side (left side in FIG. 2) of the casing 2 to the proximal end side.

On the other hand, in the illustrated example, the cutter 3 has a structure in which a cutter arm 6 protrudes radially from the outer periphery of a drive shaft 5, and is connected to the tip of a power shaft 7 passing through the inside of the rotating shaft 4a of the screw conveyor 4. They are each rotated via a gearbox 8. In addition, the gearbox 8
Inside, a connecting shaft 9 connected to the tip of the power shaft 7 is supported via a thrust bearing 10, and a worm 11 is integrally provided on the outer periphery of the connecting shaft 9. are worm wheels 12,1 attached to the left and right drive shafts 5.
It has an interlocking structure. In the figure, reference numeral 13 is a hydraulic motor that drives the screw conveyor 4, and reference numeral 14 is a hydraulic motor that drives the power shaft 5.

"Problems to be Solved by the Invention" The present invention attempts to solve the following problems in the conventional technology described above.

In the above-mentioned technique, the power source (hydraulic motor 14) for the cutter 3 is provided at the starting base, and the double-structured shafts (rotating shaft 4a, power shaft 5) are connected at intervals of, for example, 2 m, and the cutter 3 at the tip of the element is connected. Because it rotates, the efficiency of transmitted torque decreases and power is wasted.

It is difficult to seal the tip of the double-layered shaft.
Sediment seals cannot be perfected, resulting in expensive maintenance and high costs.

Since the structure is such that one worm 11 rotates two worm wheels 12, the life of the worm 11 is short.

"Means for Solving the Problems" The purpose of the present invention is to provide an excavating device for an excavator that can effectively solve the above-mentioned conventional problems. , a plurality of hollow box-shaped elements are press-fitted perpendicularly to the ground on which the tunnel is constructed, and are set at the tip of a hollow box-shaped element used as a lining that constitutes the inner wall of the tunnel, and excavation to excavate the ground at the tip of the element. In the device, a casing inserted into the element to form a dirt discharge path, a screw conveyor housed in the casing and discharging dirt from the distal end side to the proximal end side of the element, and a distal end portion of the casing, at least two cutters rotatably supported around an axis intersecting the press-fitting direction of the element; and a cutter provided on a side of the casing and stored in a space between the element and the casing. The element is configured to include a plurality of driving means that rotate each element separately to excavate the ground at the tip of the element.

"Operation" According to the above configuration, since the drive means for the cutter is housed in the space between the element and the casing, there is no need to connect the power shaft of the drive means in the axial direction and extend the drive means for the cutter. It can be directly coupled to the shaft to improve its torque efficiency, and the cutters are each driven individually, allowing for improved digging and earth removal capabilities.

On the other hand, the earth and sand excavated by the cutter is discharged from the tip side to the base side of the casing by a screw conveyor inside the casing, but the screw conveyor and the power shaft of the drive means are separated from each other. This improves sealing performance and allows for smooth discharge of excavated earth and sand.

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

The excavation device according to the present invention basically consists of a hollow box-shaped element 1 that is press-fitted into the soil by an excavator.
A casing 2 that forms an earth and sand discharge path is inserted into the casing 2, and two cutters 20 provided at the tips of the casing 2 excavate the earth and sand. It is configured to discharge from the distal end side (left side in Figure 1) to the proximal end side.

However, in the present invention, the drive means 23 for rotating the drive shaft 22 of the cutter 20 is
The main feature is that these drive means 23 are provided for each drive shaft 22 of 0 and housed in the space between the element 1 at the tip and the casing 2.

Hereinafter, to explain these in detail, first, the cutter 20 has a cutter arm 24 protruding radially from the outer periphery of a drive shaft 22. It is configured to be rotated. In the gearbox 25 there is a driving means 2.
A connecting shaft 27 connected to the power shaft 26 of No. 3 is supported via a thrust bearing 28, and a worm 29 is integrally provided on the outer periphery of the connecting shaft 28, and the worm 29 is connected to the drive shaft 22. It has a basic configuration in which it meshes with an integrated worm wheel 30.

Further, the screw conveyor 21 is connected in the axial direction like the element 1 and is driven by a hydraulic motor provided at the starting base, and in the illustrated example, the tip thereof has a tapered and pointed structure. ing.

On the other hand, the drive means 23 for driving the cutter 20 is powered by an electric motor 35, and a drive unit 38 that integrates the electric motor 35, an electromagnetic clutch 36, and a planetary gear reducer 37 is located at the tip of the casing 2. It is flange-bonded to the mirror plate 2a.

Next, the operation of the excavation rig configured in this way will be explained.

To actually excavate underground using this excavation device, the screw conveyor 21 and the power shaft 26 are rotated, and the cutter arm 24 is also rotated, and the earth and sand excavated by the cutter arm 24 are transferred to the screw conveyor. 21, the element 1 may be propelled while being discharged from the distal end side of the casing 2 to the proximal end side.

In this excavation rig, the double shaft used in conventional excavation rigs is omitted and each cutter 20 is driven by a separate drive means 23, so the load on the worm 29 and thrust bearing 28 is reduced. The torque efficiency can also be improved. Moreover, the driving means 23 is housed in the space between the element 1 and the casing 2, and there is no need to connect the power shaft 26 of the driving means 23 in the axial direction and extend the drive shaft 22 of the cutter 20. Since it can be directly connected, a powerful and highly efficient electric motor 35 can be installed in a narrow space, making it possible to improve excavation and soil removal capabilities.

In addition, in this embodiment, the screw conveyor 21 and the power shaft 26 of the drive means 23 are separated from each other, eliminating the difficult part to seal.
The sealing performance of the casing 2 is improved, and the excavated earth and sand can be smoothly discharged.

Furthermore, in the embodiment described above, since the electric motor 35 is employed as the power source for the drive means 23, even if the excavation section moves forward and the electric motor 35 moves away from the starting base, the cord connected to the electric motor 35 can be disconnected. By extending the length, the electric motor 35 can be easily controlled, and therefore the movement of the excavation part can be easily coped with. Note that the present invention is not limited to the electric motor 35 as in the embodiment, but may be configured to be driven by a hydraulic motor or the like.

"Effects of the Invention" As explained above, the present invention provides the following excellent effects.

(a) Since the drive means of the cutter is housed in the space between the element and the casing, there is no need to extend the power shaft of the drive means, and it can be directly connected to the drive shaft of the cutter, increasing its torque efficiency. In addition, since the cutters are individually driven by the drive means, the load on the drive means is small, and a powerful and highly efficient drive means can be installed, increasing the excavation and soil removal capacity. can be improved.

(b) Since the screw conveyor and the power shaft of the drive means are separated from each other, difficult parts to seal are eliminated, maintenance is easy and contributes to cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
Figures 1 and 3 show an example of a conventional excavation device, with Figure 2 being a sectional view and Figure 3 being a front view thereof. 1...Element, 2...Casing, 20...
... cutter, 21 ... screw conveyor, 22
... Drive shaft, 23 ... Drive means, 24 ... Cutter arm, 25 ... Gear box, 26 ... Power shaft, 27 ... Connection shaft, 28 ... Thrust bearing, 2
9...Worm, 30...Worm wheel, 3
5...Electric motor.

Claims (1)

[Scope of utility model registration request] In an excavation device that is set at the tip of a hollow box-shaped element used as a lining that constitutes the inner wall of the tunnel, which is press-fitted perpendicularly to the ground on which a tunnel is constructed, and excavates the ground at the tip of the element. , a casing inserted into the element to form a dirt discharge path; a screw conveyor housed in the casing and discharging dirt from the distal end side of the element to the proximal end side; at least two cutters rotatably supported around an axis intersecting the press-fitting direction; An excavation device for an excavator, characterized in that it is equipped with a plurality of drive means that separately rotate to excavate the ground at the tip of the element.