JPH0423929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a trench excavator, and more particularly to an excavator for forming a rectangular cross-sectional trench suitable for an underground continuous wall.

[Background of the invention]

A diaphragm wall is an underground structure that replaces a caisson.
It is formed for purposes such as rigid foundations for high-rise buildings, foundations for tower-shaped buildings, and underground tank walls. To create such an underground continuous wall, first, a wall-shaped trench is dug underground using a trench excavator. Next, reinforcing bars are placed in the excavated trench, concrete is poured from the ground to form a wall of one element, and these elements are connected to form a continuous wall underground as a whole. It is something.

Various trench drilling machines have been proposed in the past as trench drilling machines suitable for such underground continuous walls.
For example, the present applicant is
The trench drilling machine disclosed in Publication No. 60-211424 was proposed.

To explain this trench drilling machine, the drilling machine body 9
is configured so that it can be suspended from the ground via ropes 12, 12. Furthermore, the excavation equipment main body 9 includes a rotational drive source 1 such as a transmission or a hydraulic motor.
6,16 are installed.

As shown in FIG. 8, a gear case 18 is formed in the lower part of the apparatus main body 9, and horizontal rotation shafts 20, 20 are pivotally supported on this gear case 18. Drum-shaped cutters (hereinafter referred to as drum cutters) 22, 22 are fixed to the horizontal rotating shafts 20, 20. The drum cutter 22 has a gear case 1 inside it.
It is sized to accommodate 8. The drum cutters 22, 22 are arranged with a predetermined gap as shown in FIG. 8, and in the space formed above there is a gear case that connects the gear case 18 and a gear case on the apparatus main body side, which will be described later. 18A is now placed. A horizontal rotating shaft 28 of a ring-shaped cutter (hereinafter referred to as a ring cutter) 26 is pivotally supported on the gear case 18 . ring cutter 26
is formed to have a smaller diameter than the drum cutter 22, and its central axis 28 is eccentrically arranged.

As shown in FIG. 8, a gear case 30 on the main body 9 side is provided at the upper part of the gear case 18A.
The gear cases 30, 18A, 18 have a rotary drive source 1.
Gear transmission means for power transmission from 6 is arranged. That is, the rotational force of the rotational drive source 16 is transmitted to the gear 58 of the horizontal rotation shaft 20 via the gear transmission means, and rotates the horizontal rotation shaft 20 to rotate the drum cutter 2.
Rotate 2. Furthermore, gear 58 is idle gear 5
A gear 60 fixed to the horizontal rotating shaft 28 via 9
The ring cutter 26 also rotates.

The pair of drum cutters 22, 22 to which the power is transmitted in this manner and the ring cutter 26 disposed between the drum cutters 22, 22 are arranged in two units in parallel as shown in FIG. When the two units are arranged in parallel in this way, since the ring cutter 26 has a smaller diameter than the drum cutter 22, a gap is formed between the opposing surfaces of the units, and the bits 62, 62 can be placed in this gap. can. This bit 62 is provided at the lower end of the reverse shaft 63 and can be placed at the bottom of the drum cutter. The bit 62 is rotated via a gear transmission means 63A that transmits rotational force from a rotational drive source 66.

When the trench excavator configured as described above is lowered, a rectangular excavation hole is formed in the ground. FIG. 9 shows the general shape of the excavated hole excavated using the trench excavator. 9th
As shown in the figure, the side surface 66 of the excavated hole 64 is arranged so that the side surfaces of the drum cutter 22 and the ring cutter 26 are substantially on the same surface, so it is formed in a smooth shape, and the bottom surface 68 of the drum cutter 2
Since the ring cutter 2 and the ring cutter 26 are arranged so as to be on substantially the same plane, the bottom surface of the excavated hole 64 is also formed on the same plane. Also, drilling hole 64
Since the bits 62, 62 are arranged in the uncut portion 70 formed in the center of the slime, the bits 62, 62 are disposed as described above, and the slime is excavated by the bits 62, 62, and the slime is discharged to the ground through the reverse shaft 63. become.

However, with conventional trench excavators, when changing the length of the excavation trench 64 depending on the purpose of the structure, the cutter of the trench trench excavator cannot be freely replaced, and the excavator itself has to be replaced. It was hot.

[Purpose of the invention]

The present invention was made in view of these circumstances, and allows bits of different diameters to be used without changing the main body of the device.
It is an object of the present invention to provide a trench excavator that can be attached with a drum cutter and a ring cutter and is economically effective.

[Summary of the invention]

In order to achieve the above object, the present invention comprises a pair of drum cutters arranged coaxially at a predetermined distance and having a horizontal axis of rotation, and a ring cutter arranged eccentrically with respect to the rotation axis of the drum cutter. and a unit consisting of the pair of drum cutters and a ring cutter placed between the pair of drum cutters is arranged symmetrically about the reverse axis, and a wing bit having a vertical axis of rotation is arranged between the units. The trench excavator has a first frame that can be suspended, a first power transmission mechanism that transmits power from a first rotary drive source mounted on the wing bit, and a lower part of the first frame. A second frame is attached to the reverse shaft and is expandable and retractable through a detachable first space, and a second rotary drive source mounted thereon transmits power to the drum cutter and transmits power from the drum cutter through the drum cutter. Furthermore, it has a second power transmission mechanism that transmits power to the ring cutter, and a third frame that can be expanded and contracted around the second frame via a detachable second spacer, and the first and second spacers are attached and detached. By doing so, the distance between the rotational axes of the drum cutter and the distance between the rotational axes of the drum cutter and the ring cutter can be freely adjusted between the units, and drum cutters, ring cutters, and wing bits of arbitrary diameters can be attached. It is characterized by

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a trench excavator according to the present invention will be described in detail below with reference to the accompanying drawings.

In this embodiment, the same or similar members as in the conventional example shown in FIGS. 7 to 9 are given the same reference numerals, and detailed explanation thereof will be omitted.

A reverse shaft 63 vertically passes through the center of the first frame 10, and a second frame 10 is arranged around the reverse shaft 63 at the bottom of the first frame 10.
0,100 are detachably attached. Second
The frame 100 of may be divided,
It may be a single piece. A first drive source 70 is provided on one side of the second frame 100.

As shown in FIGS. 2 and 3, gears 71, 72, 73, 74, 75, 76, 7 are
7 to a gear 78 fixed to the bit shaft 82, and from this gear 78 to a gear 79 provided around the reverse shaft 63, and a gear 81 fixed to the bit shaft 83 via an idle gear 80.
It is designed to transmit power to the Note that the bit shafts 82, 82 are rotatably supported by the second frame 100, are provided at symmetrical positions across the reverse shaft 63, and transmit power to the gear 81 via the idle gear 80. , the center of the gear 79 is eccentrically provided by δ with respect to the center of the reverse shaft 63. Or gears 78, 79, 8
If 1 is a shifted gear, there is no need for eccentricity. Alternatively, the gear 79 may be arranged around the outer circumference of the reverse shaft.

There are third frames on both sides of the second frames 100, 100.
The frames 102, 102 are removably attached. The third frame 102 has a horizontal rotation axis 20
A drum cutter 22 is rotatably provided via the drum cutter 22 . Further, drive sources 16, 16 are provided in the third frames 102, 102, respectively, and power is transmitted from the drive sources 16, 16 to a drum cutter 22 and a ring cutter 26 provided at the lower part of the third frame 102. The mechanism for transmitting power to the drum cutter 22 and the ring cutter 26 is the same as that shown in FIG. 8, so a detailed explanation will be omitted here.

The drum cutter 22, ring cutter 26 and wing bit 62 shown in FIG. 1 are replaced with the large diameter drum cutter 67 and ring cutter 68 shown in FIG. 4, respectively.
The case of replacing the wing bit with the wing bit 69 will be explained. From wing bit 62 to wing bit 69, which has a larger diameter than this wing bit 62.
When replacing the wing bit 69 with the wing bit 69, it is necessary to widen the distance between the bit shafts 82 and 83 in accordance with the diameter of the wing bit 69. In this case, first, as shown in FIGS. 5 and 6, the second
The frames 100, 100 are expanded, two spacers 84 are interposed therebetween, and then a gear 89 with a large diameter is provided in place of the gear 79. The spaces between the spacer 84, the frame 100, and the reverse shaft 63 are fixed with bolts or the like via a sealing material.

Also, when replacing the drum cutter 22 with a drum cutter 67 having a larger diameter than the drum cutter 22, it is necessary to increase the distance between the horizontal rotating shafts 20 of the drum cutters in the same manner as described above. In this case, the spacer 84 also increases the distance between the axes, but as shown in FIG.
0 and the third frame 102, a spacer 90,
90 to separate the third frame 102 from the second frame 100. Thereby, the distance between the horizontal rotating shafts 20 rotatably supported by the third frame 102 is increased.

Next, from ring cutter 26 to this ring cutter 2
When replacing the ring cutter 68 with a larger diameter than the drum cutter 67 and the ring cutter 68,
Drum cutter 6
It is necessary to adjust the distance between the horizontal rotation shaft 20 of the ring cutter 7 and the horizontal rotation shaft 28 of the ring cutter 68. The horizontal rotation shaft 28 of the ring cutter 68 is rotatably supported by the fourth frame 29. In this embodiment, when replacing the ring cutter 26 with the ring cutter 68,
By separating the fourth frame 29 from the horizontal rotating shaft 20 of the drum cutter 67 by interposing spacers 92, 92, the distance between the shafts is increased by l. Furthermore, a gear 94 with a large diameter is provided in place of the gear 59, and the gear 59 is connected from the horizontal rotation shaft 20.
Power is transmitted to the rotating shaft 28 of the ring cutter 26 via the rings 8, 94, and 60.

Finally, the guide 14 is expanded according to the outer shape of the drum cutter 67 and the like. That is, the guide 14 is spread out via spacers 95, 96, and 97 arranged on the outside of the third frame 102. Note that each of the spacers described above can be attached as appropriate with bolts as shown in FIG. 5 through a sealing material.

〔Effect of the invention〕

As explained above, according to the trench drilling machine according to the present invention, the second frame is expanded or contracted by attaching and detaching the first spacer to adjust the distance between the axes of the wing bits, and the third frame is adjusted by attaching and detaching the second spacer. The distance between the axes of the drum cutters can be adjusted by expanding or contracting the frame, and the distance between the axes of the drum cutter and the ring cutter can be adjusted by expanding or contracting the fourth frame by attaching and removing the third spacer. In this way, wing bits, drum cutters, and ring cutters of any diameter can be installed by adjusting the center distance between wing bits, between drum cutters, and between drum cutters and ring cutters. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the trench drilling machine according to the present invention, FIG. 2 is a sectional view of the embodiment shown in FIG. 1, and FIG. 3 is a front view of the embodiment shown in FIG. 1. cross section,
FIG. 4 is a front view showing the groove length of the trench excavator shown in FIG. 7 and 8 are respectively a front view and a side sectional view of a conventional trench hole excavator, and FIG. 9 is an explanatory diagram showing the shape of a borehole excavated using the trench hole excavator. DESCRIPTION OF SYMBOLS 10... First frame, 12... Rope, 16... Rotation drive source, 18, 18A, 30... Gear case, 2
0...Horizontal rotation axis of drum cutter, 22,67...Drum cutter, 26,68...Ring cutter, 28...
Horizontal rotation axis of ring cutter, 29...4th frame, 62, 69...bit, 63...reverse axis, 6
4...Drilling hole, 82, 83...Bit shaft, 84, 9
0,92,95,96,97...Spacer, 100
...Second frame, 102...Third frame.

Claims (1)

[Scope of Claims] 1. A pair of drum cutters arranged coaxially at a predetermined distance and having a rotational axis in a horizontal direction; and a ring cutter arranged eccentrically with respect to the rotational axis of the drum cutters. , a slotted hole in which a unit consisting of the pair of drum cutters and a ring cutter arranged between the pair of drum cutters is arranged symmetrically about the reverse axis, and a pair of wing bits having a vertical axis of rotation are arranged between the units. The excavator includes a first frame 10 that can be suspended and through which the reverse shaft is vertically penetrated, and a first frame 10 that transmits power from a mounted first rotary drive source to the wing bit. a second frame 100 that has a power transmission mechanism, rotatably supports the wing bit, and is expandable and retractable via a first spacer 84 that is detachably provided at the lower part of the first frame 10 surrounding the reverse shaft; , a second rotary drive source that transmits power from a second rotary drive source mounted on the drum cutter and the ring cutter;
a third frame 102 that rotatably supports the drum cutter and is expandable and retractable via a second spacer 90 that is detachably provided around the second frame 100; a fourth frame 29 whose shaft is rotatably supported and which is expandable and retractable via a third spacer 92 that is detachably provided between the rotation shaft of the drum cutter and the rotation shaft of the ring cutter;
The second frame 100 is expanded and contracted by attaching and detaching the first spacer 84 to adjust the distance between the axes of the wing bits, and the third frame 102 is expanded and contracted by attaching and detaching the second spacer 90 to adjust the distance between the axes of the wing bits. The diameters of the wing bit, drum cutter, and ring cutter can be changed by adjusting the distance between the axes of the drum cutter and the ring cutter, and by expanding and contracting the fourth frame 29 by attaching and detaching the third spacer 92. A trench drilling machine characterized by: 2. The trench drilling machine according to claim 1, wherein the pair of wing bits have opposite rotational directions and the same rotational speed, and a portion of the wing bits overlap. .