JPH0324927B2 - - 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, an excavator has been proposed in which a plurality of vertical shafts are arranged in parallel and cutters 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, there is a problem in that both ends of the trench are formed in an arcuate shape because the bit rotates in a horizontal plane. Furthermore, in the underground wall construction method that does not use rocking pipes, after pouring concrete, the end face of the existing concrete foundation is excavated while an adjacent trench is excavated, but since the cutter rotates in a horizontal plane, the excavator itself There are problems such as vibration and not being able to drill a groove in a predetermined shape and position.

Since such a trench excavator having a vertical rotation shaft cannot produce a trench with a rectangular cross section, a trench excavation machine having cutters attached to both ends of the horizontal rotation shaft has been proposed. For example, Publication No. 50-2242, Special Publication No.
Excavators such as those disclosed in Publication No. 56-4692 fall under this category. However, in the trench hole excavators described in these publications, 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. Since the mouth is located at the top of the drum katsuta,
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 drum cutter 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 spacing between the cutters in order to reduce the uncut portion, the space for the power transmission means becomes narrower, sufficient power transmission is not achieved, and the strength of the support is 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, which results in the problem of leaving a large portion uncut. This kind of unexcavated area makes it difficult to carry out the trench excavation work itself smoothly, and the reverse suction port is located at the top of the drum cutter, so the soil removal efficiency is poor, and the unexcavated part remains and creates slime on the bottom of the trench. remains, causing problems with 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, and a drive source mounted on the device main body, which are coaxially arranged at a predetermined interval at the bottom of the device main body, and have a rotation axis in a horizontal direction. a pair of drum cutters, a ring cutter eccentrically arranged with respect to the rotation axis of the drum cutters, and a power transmission mechanism that transmits power from a rotational drive source through a space formed in an upper opposing surface of the pair of drum cutters. , has
The apparatus is characterized in that 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 main body of the apparatus.

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

As shown in FIG. 2, a gear case 18 is formed in the lower part of the apparatus main body 10, 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 is formed in a size that can accommodate the gear case 18 therein. The drum cutter 22 has a cutting edge 24 formed on its outer peripheral surface. The drum cutters 22, 22 are arranged with a predetermined gap as shown in FIG. 2, 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 . A cutting edge 27 is formed on the outer periphery of the ring cutter 26, similar to the drum cutter 22. ring cutlet 2
6 is formed to have a smaller diameter than the drum cutter 22, and its central axis 28 is eccentrically arranged. That is, as shown in FIG. 1, the ring cutter 26 is arranged with its horizontal rotating shaft 28 eccentric so that the side and bottom surfaces of the drum cutter 22 are substantially flush with the side and bottom surfaces of the ring cutter 26.

As shown in FIG. 2, a gear case 30 on the main body 10 side is provided at the upper part of the gear case 18A, and the gear cases 30, 18A, and 18 have a group of reduction gears for transmitting power from the rotational drive source 16. is located. That is, a gear 34 is disposed on the output shaft 32 of the motor 16, and from this gear 34, gears 36, 38, 40, 42, etc. disposed in the gear case 30 are connected.
44. The rotational force of gear 44 is transmitted to gear 50 provided in gear case 18 via gears 46 and 48 provided in gear case 18A. The rotational force of the gear 50 is branched to gears 54 and 55 provided on both sides of the horizontal rotating shaft 52, and transmitted to the drum cutters 22 and 22 on both sides. That is gear 5
4 and 55 are transmitted to the gear 58 of the horizontal rotation shaft 20 via the idle gear 56, which rotates the horizontal rotation shaft 20 and rotates the drum cutter 22. Furthermore, the gear 58 also meshes with a gear 60 fixed to the horizontal rotating shaft 28 via an idle gear 59, thereby rotating the ring cutter 26 as well.

The pair of drum cutters 22, 22 to which the power is transmitted in this way 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 on the opposing surfaces of the units, and the bit 62 can be placed in this gap. 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 reverse shaft 63 is connected to the bit 62 via a gear transmission means 63A branched from the gear transmission means that connects the rotational drive source 16 and the drum cutter 22.
can be rotated. drum cutter 22,
The slime excavated by the ring cutter 26 and the bit 62 passes through the inside of the reverse shaft 63 and is discharged to the ground. As the rotational drive source for the reverse shaft 63, 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 applied to the gear cases 30, 18A,
Drum cutter 2 via gear transmission means in 18
2, transmitted to the ring cutter 26. In this case, as shown in FIG. 1, the drum cutter 22 and 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 canceled out by each other. When the excavator main body 10 is lowered in this state, a rectangular excavation hole is formed underground. FIG. 3 shows the general shape of a borehole excavated using the trench excavator according to the present invention. As shown in FIG. 3, the side surfaces 66 of the excavated hole 64 are arranged so that the side surfaces of the drum cutter 22 and the ring cutter 26 are substantially on the same plane, so that they are formed in a smooth shape, and the bottom surface 68 of the drum cutter 26 also has a smooth surface. Since the ring cutter 22 and the ring cutter 26 are arranged to be substantially on the same plane, the bottom surface of the excavated hole 66 is also formed to be on the substantially same plane. Also drilling hole 6
Since the bit 62 is disposed in the uncut portion 70 formed in the center of the slime 4, the bit 62 is used to excavate the remaining portion 70, and the slime is discharged to the ground through the reverse shaft 63.

In the above embodiment, one bit 6 is inserted between the units.
2 was provided, but two bits 62 were provided,
The directions of rotation may be reversed to cancel out the excavation reaction torque of the bit 62. That is,
As shown in FIG. 4, bit shafts 64, 64 may be provided on both sides of the reverse shaft 63, and a bit 62 may be provided at the lower end of each bit shaft 64. In the embodiment shown in FIG. 4, a drive source 66 dedicated to this bit 62 is provided. Further, each guide 14 is provided with an adjustable guide 14A that can move forward and backward.

〔Effect of the invention〕

As explained above, according to the trench excavator according to the present invention, since the cutter is provided on the horizontal rotating shaft, a rectangular trench can be formed, and the end face of existing concrete can also be easily excavated. I can do it. In addition, the trench excavator according to the present invention has drum cutters arranged at predetermined intervals on the horizontal rotating shaft, and utilizes the spacing between the drum cutters to transmit the rotational force from the rotational drive source to the drum cutters. I decided to excavate with a ring cutter, so
There is no need to leave unexcavated areas, which was the case in the past.

[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. FIG. 4 is a front view showing the structure of another embodiment of the present invention. 10...Drilling equipment body, 12...Rope, 16
... Rotation drive source, 18, 18A, 30 ... Gear case, 20 ... Horizontal rotation axis of drum cutter, 22
...Drum cutlet, 26...Ring cutter, 28
...Horizontal rotation axis of ring cutter, 62...Bit, 64...Drilling hole.

Claims (1)

[Claims] 1. A device main body, a drive source mounted on the device main body, and a pair coaxially disposed at a predetermined interval at the tip of the device main body and having a rotation axis in a direction perpendicular to the excavation direction. A drum cutter, a ring cutter eccentrically arranged with respect to the rotational axis of the drum cutter, and a power transmission mechanism that transmits power from a rotational drive source through a space formed in rear facing surfaces of the pair of drum cutters. A trench excavator characterized in that a plurality of units comprising the pair of drum cutters and a ring cutter arranged between the pair of drum cutters are arranged in plural rows at the tip of the main body of the apparatus. 2. A device main body, a drive source mounted on the device main body, a pair of drum cutters coaxially arranged at a predetermined interval at the tip of the device main body and having a rotation axis perpendicular to the excavation direction; It has a ring cutter arranged eccentrically with respect to the rotational axis, and a power transmission mechanism that transmits power from a rotational drive source through a space formed in rear opposing surfaces of the pair of drum cutters, and the pair of drum cutters Further, a plurality of units consisting of ring cutters arranged between the pair of drum cutters are arranged in parallel at the tip of the main body of the apparatus, and a reverse shaft equipped with a bit is arranged in the gap formed between the units. Trench drilling machine. 3. A device main body, a drive source mounted on the device main body, a pair of drum cutters coaxially arranged at a predetermined interval at the tip of the device main body and having a rotation axis perpendicular to the excavation direction; It has a ring cutter arranged eccentrically with respect to the rotational axis, and a power transmission mechanism that transmits power from a rotational drive source through a space formed in rear opposing surfaces of the pair of drum cutters, and the pair of drum cutters A plurality of units consisting of ring cutters arranged between the pair of drum cutters are arranged in parallel at the tip of the main body of the device, a reverse shaft is arranged in the gap formed between the units, and the tips are arranged on both sides of the reverse shaft. A trench drilling machine characterized in that a pair of bit shafts each having a bit are arranged in the part thereof.