JPS61225424A - Trencher - Google Patents

Abstract

PURPOSE:To prevent the occurrence of unexcavated portion by a method in which an upwardly eccentric ring cuter is provided between paired drum cutters set on the horizontal rotary shaft, and rotation force from a rotary drive source is transmitted to the drum cutters and the ring cutter. CONSTITUTION:Rotation force of a rotary drive source 16 serves to turn a ring cutter 26 through a decelerating gear group 30, a horizontal rotary shaft 32, and a gear 34. By the rotation force of the drive source 16, drum cutters 22 are turned to the opposite direction of the ring cutter 26 through a decelerating gear group 38, a horizontal rotary shaft 40, gears 42 and 46, a horizontal rotary shaft 44, and gears 48 and 50. Since a rectangular pit is excavated under the ground by the excavator, an underground continuous wall having necessary strength can be formed without leaving unexcavating portion.

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 trench with a rectangular cross-section suitable for underground walls. [Background of the Invention] Walls are formed for purposes such as underground structures in place of caissons, rigid foundations for high-rise buildings, foundations for tower-like buildings, underground tank walls, and the like. 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, an excavator has been proposed in which a plurality of vertical shafts are arranged in parallel and bits are arranged alternately and overlappingly at the lower ends of the vertical shafts, thereby excavating a trench hole. However, in such a trench drilling machine having a vertical rotation axis, since the bit rotates in a horizontal plane, there is a problem that both ends of the trench are formed in an arc shape. Furthermore, in the underground continuous wall construction method that does not use a rocking pipe, after concrete is poured, the end face of the existing concrete foundation is excavated while an adjacent trench is excavated, but since the bit rotates in a horizontal plane, the excavator itself may shake. However, there is a problem in that it is not possible to excavate a groove hole in a predetermined shape and position.

Since a trench excavator having such a vertical rotation shaft cannot produce a trench with a rectangular cross section, a trench excavator with counters attached to both ends of a horizontal rotation shaft has been proposed. For example, excavators such as those disclosed in Japanese Utility Model Publication No. 50-2242 and Japanese Patent Publication No. 56-4692 fall under this category. However, in the trench hole excavators described in these publications, the bone in the gap between the drum cutters provided at both ends of the horizontal rotating shaft becomes an uncut part, creating an uncut part that creates resistance during excavation, and also requires reverse rotation. Since the suction port is located at the top of the drum cutter,
There is a problem with soil removal being poor and slime remaining at the bottom of the hole. Since the drum cutters are placed on both sides of the support for the horizontal rotating shaft, in order to rotate the horizontal rotating shaft, a power transmission means must be placed in the center to rotate the horizontal rotating shaft. This is because in order to prevent interference between the body and the drum cutter, it is necessary to separate the drum cutters on both sides by at least the space of the support body. If an attempt is made to narrow the gap between the cutters in order to reduce the amount of unexcavation, the space for the power transmission means will be narrowed, insufficient power transmission will occur, and the strength of the support will be reduced. On the other hand, if sufficient power transmission is to be achieved, a gap corresponding to the space must be provided between the cutters, resulting in a large uncut portion. This kind of unexcavated area makes it difficult to carry out the trench excavation work itself, and since the reverse suction port is located at the top of the drum cutter, soil removal efficiency is poor, and the unexcavated part remains on the bottom of the trench. Slime remains and problems arise in terms of the strength of the diaphragm wall itself.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to propose a trench hole excavator that can form an underground continuous wall with the necessary strength without leaving any unexcavated portions.

[Summary of the invention]

In order to achieve the above object, the present invention has a device main body that can be hung, a drive source mounted on the device main body, a drive source mounted on the device main body, and a drive source mounted on the device main body that are coaxially arranged at a predetermined distance at the bottom of the device main body, and that have a rotation axis in a horizontal direction. A pair of drum cutters with a ring cutter, a ring cutter placed between the pair of drum cutters and eccentrically arranged upward relative to the rotational axis of the drum cutter, and power from a rotational drive source passing through the space inside the ring cutter. a power transmission mechanism for transmitting the power to the ring cutter and the drum cutter, and a plurality of units including the pair of drum cutters and the ring cutter arranged between the pair of drum cutters are arranged in parallel at the lower part of the apparatus main body. It is a feature.

[Embodiments of the invention]

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

In FIG. 1, the excavator main body 10 is constructed so that it can be suspended from the ground via ropes 12, 12. A plurality of guides 14 are provided on the front and side surfaces of the drilling equipment main body 10.
．． 14, . . . are provided in the vertical direction. Further, the excavation device main body 10 is equipped with a rotational drive source 16 such as an electric motor or a hydraulic motor.

A pair of drum-shaped cutters (
22, 22 (hereinafter referred to as drum cutters) are arranged at predetermined intervals, and a ring-shaped cutter (hereinafter referred to as ring cutter) 26 is arranged between the drum cutters 22, 22. As shown in FIG. 2, the drum cutter 22.22 is attached to a horizontal rotating wheel 28, and the ring cutter 26 has approximately the same diameter as the drum cutter 22, and its axis is above the horizontal rotating shaft 28. It is arranged like this. Therefore, a space is formed in the portion of the ring cutter 26 that protrudes upward from the drum cutter 22, and this space is used to drive the ring cutter 26 and the drum cutter 22 from the rotational drive source 1.
The rotational force from 6 is transmitted.

Next, a power transmission mechanism for transmitting power from the rotational drive source 16 to the drum cutter 22 and the ring cutter 26 will be explained. First, the rotational force from the rotational drive source 16 rotates the horizontal rotation shaft 32 via the reduction gear group 30. This horizontal rotation shaft 32 is located within the ring cutter 26 from a space formed above the ring cutter 26, as shown in FIG.
A gear 34 provided on the horizontal rotating shaft 32 is connected to the ring cutter 2.
It meshes with an internal gear 36 formed on the inner circumferential surface of 6. Therefore, the rotational force of the rotational drive source 16 can rotate the ring cutter 26 via the reduction gear group 30, the horizontal rotation shaft 32, and the gear 34.

Further, the rotational force of the rotational drive source 16 rotates a horizontal rotation shaft 40 disposed concentrically with the horizontal rotation shaft 32 via a reduction gear group 38 . The horizontal rotating shaft 40 is located within the ring cutter 26 from the space above the ring cutter 26, and a gear 42 is formed at the left end of the horizontal rotating wheel 40. This gear 42 is a gear 4 of a horizontal rotating shaft 44 that is pivotally supported by the ring cutter 26.
6, thereby causing the horizontal rotation shaft 44 to rotate. A gear 48 is provided on the horizontal rotating shaft 44, and this gear 48 meshes with a gear 50 fixed to the horizontal rotating ring 28 of the drum cutter 22. Therefore, the power from the rotational drive source 16 is transmitted to the reduction gear group 38, the horizontal rotation shaft 40, the gear 42, 46, the horizontal rotation shaft 44, the gear 48,
The signal is transmitted to the drum cutter 22 via the gear 50.

A pair of drum cutters 22.2 to which power is transmitted in this way
2 and the ring cutter 26 disposed between the drum cutters 22 and 22 are arranged in two units in parallel as shown in FIG.

Further, as shown in FIG. 3, the ring cutter 26 may be formed to have a slightly smaller diameter than the drum cutter 22, and may be arranged eccentrically not only upwardly but also laterally. When two units configured in this way are arranged in parallel, a gap is formed between the opposing surfaces of the units as shown in FIG. Provided at the lower end. The reverse shaft 63 can rotate the bit 62 via a gear transmission means (not shown) that is branched from the gear transmission means that connects the rotational drive source 16 and the drum cutter 22 . Slime excavated by the drum cutter 22, ring cutter 26, and bit 62 passes through the inside of the reverse shaft 63 and is discharged to the ground. Reverse shaft 63
As the rotational drive source, the rotational drive source 16 may be used, or a dedicated rotational drive source may be provided.

The operation of the embodiment of the trench excavator according to the present invention constructed as described above is as follows. First, the rotational force from the rotational drive source 16 is transmitted to the drum cutter 22 via the gear transmission means described above.
, are transmitted to the ring cutter 26. In this case, as shown in FIG. 1, the drum cutter 22 and the ring cutter 26 of the left and right units are rotated so that their rotational directions are opposite to each other, so that the excavation reaction torques are mutually canceled out. When the excavator main body 10 is lowered in this state, a rectangular excavation hole is formed underground. FIG. 4 shows the general shape of a borehole excavated using the trench excavator according to the present invention. As shown in FIG. 4, the side surface 66 of the excavated hole 64 is formed in a smooth shape because the drum cutter 22 and the ring cutter 26 are formed to have substantially the same diameter. In addition, the unexcavated portion 70 formed in the center of the excavated hole 64 is
is placed, so it is excavated by this bit 62,
The slime will be discharged to the ground through the reverse shaft 63.

In the embodiment shown in FIG. 3, one bit 62 is provided between the units, but two bits 62 are provided and the rotation directions are opposite to each other to cancel out the excavation reaction torque of the bit 62. You can do it like this.

In the embodiment shown in FIG. 5, an alternative power transmission mechanism is shown. In the embodiment shown in FIG. 5, the same or similar members as those in the embodiment shown in FIG. 2 are given the same reference numerals, and their explanations will be omitted. In the embodiment shown in FIG. 5, the drum cutter 22 is rotated by a gear 34 that rotationally drives the ring cutter 26. In the embodiment shown in FIG.

That is, the gear 34 meshes with the gear 46 of the horizontal rotation shaft 44, and the gear 48 of the horizontal rotation shaft 44 meshes with the gear 5 of the horizontal rotation shaft 28.
0, and this causes the drum canter 22.2
[Effects of the Invention] As explained above, according to the trench drilling machine according to the present invention,
Since the cutter is installed on the horizontal rotating shaft, rectangular slots can be formed, and the end face of existing concrete can also be easily excavated. Further, the trench excavator according to the present invention has a pair of drum cutters arranged at a predetermined interval on a horizontal rotating shaft, and a ring cutter eccentrically arranged upward is arranged between the drum cutters, and the space inside the ring cutter is used to make use of the space inside the ring cutter. Since the rotational force from the rotational drive source is transmitted to the drum cutter and the ring cutter, and the ring cutter is used to excavate between the drum cutters, there will be no unexcavated portion, which conventionally occurs.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a 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 ring of a trench drilling machine according to the present invention. FIG. 4 is an explanatory diagram showing the shape of a hole excavated using the trench hole excavator according to the present invention, and FIG. 5 is a front view showing another arrangement example of the cutter. FIG. 7 is a sectional view showing another power transmission mechanism. 10... Drilling equipment main body, 12... Lobe, 16
...Rotary drive source, 22...Drum cutter, 26
...Ring cutter, 28...Horizontal rotation axis of ring cutter, 32...Horizontal rotation axis, 34...Gear, 36...Internal tooth gear, 62...Bit, 64
...Drilling hole.

Claims (2)

[Claims] (1) A device main body that can be hung, a drive source mounted on the device main body, a pair of drum cutters that are coaxially arranged at a predetermined distance at the bottom of the device main body and have a horizontal rotation axis, A ring cutter is placed between a pair of drum cutters and eccentrically placed above the rotational axis of the drum cutter, and the power from the rotational drive source is transmitted to the ring cutter and drum cutter through the space inside the ring cutter. A trench drilling machine, comprising: a power transmission mechanism, wherein a plurality of units including the pair of drum cutters and a ring cutter arranged between the pair of drum cutters are arranged in parallel at the lower part of the apparatus main body. (2) The trench drilling machine according to claim 1, wherein a reverse shaft equipped with a bit is disposed in the gap formed between the units.