JPH0220302Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a flat rectangular or trapezoidal cross-sectional shape in order to construct a tunnel lining in a method of constructing a tunnel under railroad tracks, under a road, or under a structure. The above-mentioned excavator for excavating and penetrating soil by a cutter in which adjacent elements are engaged and connected and arranged in parallel in the flat direction of the elements, one of which is integrally attached to an auger. This invention relates to an auger drive device for an excavator in which the direction of a line connecting the axis of a cutter is changed according to the flat orientation of an element.

The method of directly constructing tunnels that cross under railroad tracks, etc., uses an excavator that houses a cutter head, trough pipe, auger, etc. in a rectangular or trapezoidal element with a flat cross-section. , excavate the face surface with the excavator, penetrate the element horizontally into the soil, and similarly penetrate the element with a flat rectangular or trapezoidal cross section by connecting it to the already penetrated element. A method has been adopted in which a rectangular or circular tunnel lining is constructed in advance in the ground, and then the soil inside the tunnel lining is excavated and removed to form a tunnel interior space.

Conventionally, an excavator used when constructing the above-mentioned tunnel lining has a configuration as shown in FIG.
A trough pipe b is housed in the trough pipe b, an auger c is housed in the trough pipe b, and a cutter drive shaft f, which has a cutter head d at its tip and passes through the shaft e of the auger c, is inserted into the trough pipe b. , connect the shaft h of the cutter arm g of the cutter head d with the gear in the gear box i, and connect the cutter arm g with the gear in the gear box i.
Excavation and earth removal are performed by the rotation of the auger C and the rotation of the auger C, and the structure is such that the element a penetrates through the excavation and soil removal.

However, in the above-mentioned conventional equipment, since the gearbox i is located at the center of the tip, it is impossible to excavate in the area of the gearbox i, and if the face is made of hard soil, the resistance to the gearbox i during excavation becomes large. For these reasons, in order to excavate without using a gearbox, different cutters installed above and below the front end of the trough pipe are driven separately, and the trough is installed only in the lower part where dirt tends to collect. Arrange the pipe and auger so that the lower cutter can rotate at the same time as the auger rotates, and connect the drive device to the rear end of the auger shaft.
Also, a type of cutter has been devised in which a drive device is directly connected to the upper cutter.

The present invention is aimed at the type of excavator that has recently been considered, in which the upper and lower cutters are driven separately and the earth removal mechanism is installed at the bottom of the element. It is designed to be able to cope with ever-changing changes.

That is, when constructing a tunnel lining body in advance in the ground, if the element 1 has a flat trapezoidal shape as shown in FIG. When the tunnel lining is constructed by penetrating together, the tunnel lining becomes arcuate and a circular tunnel is constructed, as shown in FIG. In this case, the angle of the element that is dug by the excavator and penetrated into the soil changes little by little.

The present invention was developed in an attempt to change the positions of the auger and cutter in accordance with the changes in the angles of the elements that are successively penetrated, so that excavation can be performed in a stable state at all times.

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

Figure 4 shows an example of an excavator that employs the device of the present invention.As an excavator, the auger is eccentric from the center of the element, and the axis of the auger is displaced around a gear attached outside the center of the element. It has been made possible.

To be more specific, a trough pipe 2 is arranged eccentrically in the lower half of the inner side of an element 1 having a flat rectangular or trapezoidal cross-sectional shape, and a cutter frame 3 is attached to the front end of the trough pipe 2, and a cutter frame 3 is attached to the front end of the trough pipe 2. The first cutter 4 is directly connected to a drive device 6 installed on the upper surface of the front end of the trough pipe 2, and the second cutter 5 is connected to an auger 7 passed through the trough pipe 2. The shaft of the auger 7 is connected to another drive device 8 via a power transmission mechanism, so that the auger 7 and the second cutter 5 can rotate simultaneously to perform excavation and earth removal. , the auger 7 and the cutters 4, 5 are made movable around the center of the element 1.

That is, an adjustment trolley 11 that is moved back and forth by an adjustment cylinder 10 is placed on the propulsion unit body 9 which is in contact with the rear end of the element 1 so that the element 1 penetrates into the soil. In frame 12 of , the center of element 1 (i.e.
The drive device 8 is positioned at the center of the propulsion device body 9.
, the output shaft 13 of the drive device 8 is extended into the frame 12 and a gear 14 as a power transmission mechanism is attached, and the shaft of the auger 7 is also extended into the frame 12 and a gear 15 is attached to the shaft, The gears 14 and 15 are meshed to rotate the shaft of the auger 7 from an eccentric position, and a gear box 16 which is located within the frame 12 and houses a power transmission mechanism for the gears 14 and 15 is connected to the gear box 16. 14, and the rear end of the trough pipe 2 is fixed to the gear box 16. A bush 17 is interposed between the gear box 16 and the frame 12, so that the gear box 16 slides on the bush 17 to rotate, and the gear 15 and auger 7 can be displaced around the gear 14.

The gear box 16 can be fixed at any rotational position, and can be rotated by a separate drive (such as human power). or,
A hole 2' is cut out at the rear of the trough pipe 2, and the excavated waste falls downward through this hole 2'.

With the above configuration, when the drive device 6 for the first cutter 4 and the drive device 8 for the second cutter 5 are both driven, the first cutter 4 starts rotating.
The second cutter 5 has an output shaft 13 and gears 14,1
It starts rotating together with the auger 7 via the power transmission mechanism 5. When the face is excavated, the earth is removed by the rotation of the auger 7 located below, and the excavation is carried out by advancing the excavator main body 9, and the element 1 is penetrated into the soil. Once the element 1 has been pierced in this way, the cutter is withdrawn from the element and pushed into another element which is adapted to be engagedly connected to said element, thereby also piercing the element.

When the element has a flat trapezoidal cross-sectional shape, the setting angle of the element 1 changes little by little when the elements are successively penetrated into the soil. In this case, the gearbox 16 is moved to the output shaft 13 of the drive device 8 in accordance with the changing angle.
Rotate around. As a result, the gear 15 in the gear box 16 rotates around the gear 14 meshing with it, and the auger 7, trough pipe 2, and cutters 4 and 5 simultaneously rotate in a circle around the axis of the element 1. Rotated in the circumferential direction. Therefore, even if the angle changes for each element 1 as shown in FIG. 3, the relationship between the element 1 and the cutters 4 and 5 can always be maintained by rotating the gear box 16 in accordance with the changed angle. It can be held in the same position and excavation can be performed in a stable state. At this time, since the rotation center of the gearbox 16 is the axis of the output shaft of the drive device 8 and the center of the element 1, power can be reliably transmitted no matter what angle the auger 7 is at. Further, the trough pipe 2 as well as the auger 7 can rotate smoothly.

Due to the rotation of the gear box 16, the gear 1 is
The state in which the auger 5 and the auger 7 rotate around the output 13 of the drive device 8 is as shown in FIG.
Figure A shows the state when the element 1 is not tilted, and Figure 5B shows the state when the element 1 is tilted at a certain angle.

As described above, according to the device of the present invention, the auger is provided at a position off the center of the element, and the power of the drive device installed with the axis of the output shaft aligned with the center of the element is transmitted to the above through the power transmission mechanism. The power transmission mechanism and the gear box housing the same can be transmitted to the auger at an eccentric position, and
The structure allows the drive device to rotate around the output shaft together with the auger, trough pipe, and cutter, so even when the angle of the element changes when penetrating the element and constructing the tunnel lining, this The position of the auger and cutter can be changed according to the angle, and the relationship between the element and cutter can always be kept constant, making it possible to perform excavation in a stable state without tilting the propulsion unit, which is an excellent effect. obtain.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a conventional excavator, Fig. 2 is an example of an element, Fig. 3 is a state diagram of connecting elements to construct a tunnel lining, and Fig. 4 is a diagram showing a device equipped with the device of the present invention. FIGS. 5A and 5B are cross-sectional views of the excavating machine shown in FIG. 1...Element, 2...Trough pipe, 4...
...First cutter, 5...Second cutter, 7...Auger, 8...Drive device, 9...Propulsion machine body, 11
...Adjustment trolley, 13... Output shaft, 14, 15...
Gear (power transmission mechanism), 16...gear box, 17...button.

Claims (1)

[Scope of utility model registration request] A cutter is provided in an element having a flat rectangular or trapezoidal cross-sectional shape and inserted in parallel at a position off the center of the element, one cutter being inserted at a position off the center of the element. The cutter is mounted integrally on the tip of an auger shaft that is inserted into the trough pipe and is rotated by a drive device provided at the rear of the trough pipe. In an excavator which is attached to a device and in which both the cutters are rotationally driven separately, the output shaft of the drive device for rotating the auger is located at the center of the element, and at a position eccentric from the center of the element. An auger in an excavator, characterized in that a power transmission mechanism for transmitting power to an auger shaft located in an excavator is housed in a gear box rotatable about the output shaft, and a rear end of the trough pipe is fixed to the gear box. Drive device.