JPH08319632A - Multi-spindle auger device - Google Patents

Abstract

PURPOSE: To scrape off excavating-remaining sections in excavated pits surely and quickly under an extremely stable state without applying overload which may cause troubles to the revolution of the shaft of a sub-excavation bit to the shaft. CONSTITUTION: A bearing frame 5 rotatably bearing auger shafts 2a, 2b, 2c is installed extending over each auger shaft 2a, 2b, 2c in the lower sections of the auger shafts 2a, 2b, 2c for a multi-spindle auger device, sub-excavation bit shafts 7a, 7b with sub-excavation bits 6a, 6b scraping off excavating- remaining sections 15 between excavated pits formed by main excavation bits 4a, 4b, 4c are drooped and connected in parallel with the auger shafts among each auger shaft 2a, 2b, 2c in the bearing frame 5, and each sub-excavation bit shaft 7a, 7b is interlocked and coupled with the auger shafts 2a, 2c by interlocking means mounted in the bearing frame 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axis auger device mainly used for excavating a continuous wall ditch in the construction of an underground continuous wall.

[0002]

2. Description of the Related Art A multi-axis auger device of this type comprises an auger drive device which is suspended from the top of a reader or the like via a suspending means such as a wire so that a plurality of drill bits are provided at each tip. Auger shafts are hung and connected in parallel with each other at required intervals.However, when excavating a continuous wall groove with such a device, it is left uncut between the drill holes formed by each drill bit. Since there is a part, the underground continuous wall formed by filling the continuous wall groove with cement milk etc.
As indicated by W, both the inner and outer wall surfaces have a wavy shape, which causes variations in the strength of the continuous wall and is not preferable in terms of appearance. Therefore, for example, in the case of forming a basement, each convex portion of the corrugated inner wall surface of the above-mentioned underground continuous wall W, which is the wall surface of the basement, is slid along a strip line L indicated by a virtual line in FIG. The wall surface is made almost flat. Of course, there are also cases where the inner and outer wall surfaces of the corrugated shape are suspended.

[0003]

Since the above-mentioned chipping work requires a great deal of labor and time, in order to eliminate such chipping work, a trench between the drill holes formed by the drill bit is used. Conventionally, a multi-axis excavator equipped with a side cutter that scrapes off the remaining part has been proposed, but this conventional side cutter is an umbrella that is installed on both shafts with the cutter rotation axis orthogonal to the auger axis. Since the rotation of the auger shaft is transmitted to the cutter rotating shaft through the gear, the structure of the interlocking connection between the auger shaft and the cutter rotating shaft becomes complicated, and the cutter rotating shaft is orthogonal to this when excavating. There was a problem that the bearing part of the cutter rotation shaft was damaged within a short period of time due to an excessive load applied in the direction of rotation.

Further, generally, in a multi-axis auger device, each auger shaft becomes considerably long, and there is a possibility that the auger shafts may roll until they are hung from the auger drive device and the drill bits may interfere with each other. A guide for holding the auger shafts at a required interval is provided under each auger shaft over each auger shaft. In the conventional guide, a ring member externally fitted to each auger shaft and each ring member are integrally connected. Since it has a simple structure called a pair of eyeglasses consisting of a connecting member, each auger shaft is easily worn and damaged due to contact with the ring member, and there is a considerable gap between each auger shaft and the ring member. Therefore, there is also a problem in that each auger shaft causes rattling with the ring member.

An object of the present invention is to solve the above-mentioned problems in the conventional multi-axis auger device.

[0006]

According to claim 1 of the present invention, an auger drive device 1 is provided with a main excavation bit 4a, 4b, at each tip.
A multi-axis auger device in which a plurality of auger shafts 2a, 2b, 2c provided with 4c are hung and connected in parallel with each other at a required interval, and the auger shafts 2a, 2b, 2c are provided below the auger shafts 2a, 2b, 2c. A support frame 5 for rotatably supporting the shafts 2a, 2b, 2c is provided over the respective auger shafts 2a, 2b, 2c, and in the support frame 5, between the drill holes formed by the main excavating bits 4a, 4b, 4c. The sub-drilling bits 6a and 6b for scraping off the unexposed portion 15 are provided at the positions where they do not interfere with the main excavating bits 4a, 4b and 4c, and the sub-drilling bits rotating shafts 7a and 7b are attached to the auger shafts 2a, 2b and 2 respectively.
The sub-digging bit rotary shafts 7a and 7b are hung between the c and the auger shafts 2a and 2c by interlocking means provided in the support frame 5.

According to a second aspect of the present invention, in the multi-axis auger apparatus according to the first aspect, a support frame 5 is provided between the support frame 5 and each auger shaft 2a, 2b, 2c. Each of the auger shafts 2a, 2b and 2c is rotatably supported by the thrust bearing 8 and the thrust bearing 9.

According to a third aspect of the present invention, in the multi-axis auger apparatus according to the first or second aspect, the interlocking means is a gear 13 provided on the sub-digging bit rotary shafts 7a and 7b, and the gear 1
Gear 1 provided on auger shafts 2a and 2c so as to mesh with
And 2.

[0009]

In the multi-axis auger device according to the first aspect of the invention, the auger drive device 1 is actuated to operate the auger shafts 2a, 2b,
When 2c is rotated, for example, the auger shafts 2a on both ends,
Each sub-digging bit rotating shaft 7a, 7b which is interlocked with 2c by interlocking means is rotated. Then, the ground to be excavated, the main excavation bit 4a of the auger shafts 2a, 2b, 2c,
When excavating by 4b, 4c, the unexcavated portion between the drill holes formed by these main excavating bits 4a, 4b, 4c is the sub excavating bit 6a of the sub excavating bit rotating shafts 7a, 7b,
It is scraped off by 6b. Therefore, for example, by injecting cement milk into the borehole, it is possible to form the underground continuous wall portion 14 in which at least one side wall surface is substantially flat.

In this multi-axis auger device, the sub-drilling sub-drilling bits 6a, 6 for scraping off the undrilled portion 15 formed between the main drilling bits 4a, 4b, 4c.
Since the sub-drilling bit rotary shafts 7a and 7b having b are hung vertically between the auger shafts 2a, 2b and 2c in parallel with the auger shafts, the excavation resistance of the ground during the excavation is the auger shafts 2a and 2b. , 2c, the sub-drilling bit rotary shaft 7a,
It acts in parallel with 7b. Therefore, the sub-drilling bit rotating shafts 7a and 7b are not subjected to an excessive load that would cause rotation, and the inter-drilled unetched portion 15 can be reliably and swiftly cut off in an extremely stable state. At the same time, stable use can be secured for a long period of time.

In the second aspect, the support frame 5 is
Since the auger shafts 2a, 2b, 2c are rotatably supported by the radial bearing 8 and the thrust bearing 9 provided between the support frame 5 and the auger shafts 2a, 2b, 2c, the auger shafts are rotatably supported. The wear damage of 2a, 2b, 2c is reduced as much as possible, and the rolling and rattling of the auger shafts 2a, 2b, 2c are prevented.

Further, according to the third aspect, the interlocking means with the sub-drilling bit rotary shafts 7a and 7b meshes with the gear 13 provided on the sub-digging bit rotary shafts 7a and 7b. Since the gear 12 is provided on the auger shafts 2a and 2c, the interlocking means has a very simple structure and is robust, has excellent durability, and is easy to manufacture.

[0013]

EXAMPLES Examples will be described with reference to the drawings.
1 showing a multi-axis auger device according to the present invention, 1
Is an auger driving device suspended from the top of the reader via a wire (suspension means) so that the auger driving device 1 includes, for example, three auger shafts with screws 3 as shown in the drawing. 2a, 2b, 2c are hung and connected in parallel with each other at a required interval, and each auger shaft 2a, 2a
At the tips (lower ends) of b and 2c, main excavation bits 4a and 4b,
4c are provided respectively. The main excavating bits 4a, 4b, 4c are arranged such that the main excavating bit 4b of the central auger shaft 2b is less than the main excavating bits 4a, 4c of the auger shafts 2a, 2c on both end sides so as not to interfere with each other. Is also placed on the upper level.

Each of the auger shafts 2a, 2b and 2c is formed in a hollow shape so that cement milk or the like can be injected into the borehole from each hollow portion during excavation. Further, since the auger drive device 1 is well known, its internal structure is not shown, but the auger shafts 2 on both end sides are not shown.
a and 2c are driven to rotate in the same direction, and the central auger shaft 2b
Is driven to rotate in the opposite direction.

A support frame 5 for rotatably supporting the auger shafts 2a, 2b, 2c is provided under the auger shafts 2a, 2b, 2c, and the main excavating bit is mounted on the support frame 5. Sub-drilling bit rotating shafts 7a, 7 provided with sub-drilling bits 6a, 6b for scraping off the remaining undrilled portion formed by 4a, 4b, 4c
b is on one side of the shaft row of the auger shafts 2a, 2b, 2c (in FIG. 1, it is arranged on the front side of the shaft row of the auger shafts 2a, 2b, 2c). They are connected to each other in parallel with the auger axis. Further, as is clear from FIG. 1, the sub-drilling bits 6a, 6b have the sub-drilling bit rotating shafts 7a, 7b shortened so that the sub-drilling bits 6a, 6b do not interfere with the main excavating bits 4a, 4b, 4c, and the main excavation in the central upper stage. It is arranged higher than the bit 4b. And
These sub-digging bit rotary shafts 7a and 7b are connected to the auger shaft 2 on both ends by interlocking means in a support frame 5 which will be described later.
a and 2c are interlocked with each other. In addition, each sub-digging bit 6a, 6b is the same as each main excavating bit 4a, 4b, 4c.
It has a diameter of about one half of the diameter of.

Regarding the internal structure of the support frame 5,
2 and 3, the support frame 5 will be described.
Is composed of a box-shaped frame body 5a and cover members 5b and 5c provided on the upper and lower portions of the box-shaped frame body 5a. As shown in FIG. A radial bearing 8 and a thrust bearing 9 are interposed between the auger shafts 2a, 2b and 2c, and the bearing frames 8 and 9 hold the auger shafts 2a, 2b and 2c at a predetermined distance from each other and support frame. 5 is supported in a state in which it can smoothly rotate. Further, as shown in FIG. 3B, the support frame 5 and the respective sub-digging bit rotary shafts 7a, 7b are provided.
A radial bearing 10 and a thrust bearing 11 are also interposed between and, whereby the sub-digging bit rotary shafts 7a and 7b are rotatably supported by the support frame 5.

As is apparent from FIG. 2, large gears 12 are provided on the auger shafts 2a, 2c on both ends, and small gears 13 are provided on the sub-digging bit rotary shafts 7a, 7b, respectively. The auger shafts 2a, 2c are provided so as to mesh with the gears 12, 13, respectively.
Is transmitted to the sub-excavation bit rotary shafts 7a and 7b through the gears 12 and 13 as interlocking means, and is rotated in the arrow direction shown in the figure.

In this embodiment, the gears 12, 13 are used as interlocking means for interlockingly connecting the respective sub-digging bit rotary shafts 7a, 7b and the respective auger shafts 2a, 2c, but as the interlocking means, sprockets are used.・ A chain may be used. However, the interlocking means composed of the gears 12 and 13 as in the embodiment has an extremely simple structure and is robust, and is also advantageous in terms of manufacturing and durability.

Explaining the case of constructing an underground continuous wall by using the multi-axis auger device having the above-mentioned structure, first, the auger drive device 1 is operated to rotate each auger shaft 2a, 2b, 2c. Along with each auger shaft 2a, 2c on both end sides, each sub-digging bit rotary shaft 7
Rotate a and 7b, and then ground the three auger shafts 2
While excavating by the main excavating bits 4a, 4b, 4c of a, 2b, 2c, the unexcavated portion on one side formed by these main excavating bits 4a, 4b, 4c is the sub-excavating bit rotating shaft 7a, 7b. Excavating to a predetermined depth while shaving off with the sub-excavation bits 6a, 6b, and injecting cement milk supplied through the hollow portions of the auger shafts 2a, 2b, 2c into the excavation hole from the tip portion thereof during the excavation. 4 to form the underground continuous wall portion 14a, and after forming the first underground continuous wall portion 14a, the second underground continuous wall portion 14a is formed at a required interval in the same manner as above. , And thereafter, a plurality of underground continuous wall portions 14a are similarly formed at required intervals.

When the required number of underground continuous wall portions 14a are formed at required intervals as described above, unexcavation between the plurality of underground continuous wall portions 14a is performed as shown by the phantom lines and solid lines in FIG. A series of underground continuous walls 14 as shown in FIG. 5 can be formed by arranging the auger device at the center of the place and performing the excavation work of the unexcavated place in the same manner as described above.

Underground continuous wall 1 formed as described above
4 is the underground continuous wall 14 as shown in FIGS. 4 and 5.
In the one side wall surface Wo, since the unetched portion 15 between the holes is not cut off, it remains corrugated, but the other side wall surface Wi
Since the sub-drilling bits 6a and 6b of the sub-drilling bit rotating shafts 7a and 7b scrape off the unexposed portion between the holes, a slight unevenness is exhibited, but the wall shape is close to a flat surface. Becomes Then, the wall surface Wi having a wall surface shape close to a flat surface is used as the inner wall surface, and the wavy wall surface W
If a basement with o as the outer wall surface is constructed, the outer wall surface is in contact with the ground soil, and therefore the corrugated shape is sufficient.

In the use of the multi-axis auger device of the present invention as described above, a sub-drilling sub-drilling bit for scraping off the undrilled portion on one side formed by the main drilling bits 4a, 4b, 4c. Since the sub excavation bit rotating shafts 7a and 7b having 6a and 6b are vertically provided between the auger shafts in parallel with the auger shafts, the excavation resistance of the ground during the excavation is the main excavation bits 4a, 4b and 4c. Similarly, the sub-drilling bit rotating shafts 7a and 7b act in parallel with the sub-drilling bit rotating shafts 7a and 7b. Therefore, the sub-drilling bit rotating shafts 7a and 7b are subjected to an excessive load such as bearing for rotation. In addition, the unexcavated portion 15 between the holes can be surely and quickly shaved off in an extremely stable state, and stable use can be secured for a long period of time.

FIG. 6 shows another embodiment of the multi-axis auger device according to the present invention. This multi-axis auger device has a support frame 5 (not shown) on which main excavating bits 4a, 4b,
The sub-drilling bit rotating shafts 7a, 7b having the sub-drilling bits 6a, 6b for scraping off the undrilled portion 15 (see FIG. 4) formed by 4c are the auger shafts 2a, 2
In a state in which the auger shafts b and 2c are arranged on both sides of the auger shaft, the auger shafts 2a, 2b and 2c are hung and connected in parallel with each other. ~ It is the same as that of the previous embodiment shown in FIG. As shown in FIG. 6, the auger shafts 2a, 2b, 2c
The two sub-excavation bit rotating shafts 7a, 7a on the left side on both sides of the shaft row of are the auger shafts 2a on the left end side, respectively.
And the two right sub-digging bit rotary shafts 7b and 7b are interlockingly connected to the right end side auger shaft 2c via the gears 12 and 13, respectively.

According to the multi-axis auger device having the above-mentioned structure, the unexposed portions between the two holes formed by the main excavating bits 4a, 4b, 4c are both scraped off, so that they are formed in the ground. The inner and outer wall surfaces of the underground continuous wall have a wall surface shape close to a flat surface as shown by Wi in FIG.

In the embodiment described above, a multi-axis auger device having three auger shafts 2a, 2b, 2c has been described, but the auger shaft may be two or a plurality of four or more auger shafts. .

[0026]

According to the multi-axis auger device of the first aspect of the present invention, the unexcavated portion between the drill holes formed by the main excavating bit can be scraped off by the sub excavating bit of the sub excavating bit rotating shaft. However, in particular, in the multi-axis auger device of the present invention, the sub-drilling bit rotary shaft having the sub-drilling sub-drilling bit is hung vertically between the auger shafts in parallel with the auger shaft. The excavation resistance of, like the auger shaft described above, acts in parallel with the sub-drilling bit rotary shaft, and therefore the sub-drilling bit rotary shaft is not subjected to an excessive load that causes rotation. , It is possible to surely and swiftly cut off the portion left undrilled in an extremely stable state, and to secure stable use for a long period of time.

According to the second aspect of the present invention, the support frame is rotatably supported by the radial bearing and the thrust bearing provided between the support frame and the auger shafts. It is possible to reduce wear damage to the shaft as much as possible, and to prevent rolling and rattling of each auger shaft.

According to a third aspect of the present invention, a gear having interlocking means with each sub-digging bit rotary shaft is provided on the sub-digging bit rotary shaft,
By configuring with the gear provided on the auger shaft so as to mesh with this gear, the structure of the interlocking means becomes extremely simple and robust, excellent in durability, and easy to manufacture.

[Brief description of drawings]

FIG. 1 is a front view of a multi-axis auger device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line XX of FIG.

3A is an enlarged cross-sectional view taken along the line YY of FIG. 1, FIG.
FIG. 2 is an enlarged sectional view taken along line ZZ in FIG.

FIG. 4 is a cross-sectional view illustrating an example of a method for forming an underground continuous wall by using the above-described multi-axis auger device, showing a state in the process of being formed.

5 is a cross-sectional view showing a state in which a series of continuous underground walls is formed from the state shown in FIG.

FIG. 6 is a cross-sectional view showing a main part of a multi-axis auger device according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view of an underground continuous wall formed by a conventional multi-axis auger device.

[Explanation of symbols]

 1 auger drive device 2a auger shaft 2b auger shaft 2c auger shaft 4a main drilling bit 4b main drilling bit 4c main drilling bit 5 support frame 6a sub drilling bit 6b sub drilling bit 7a sub drilling bit rotating shaft 7b sub drilling bit rotating shaft 8 radial Bearing 9 Thrust bearing 10 Radial bearing 11 Thrust bearing 12 Gear 13 Gear 14 Gear underground 14 Wall 15

Claims (3)

[Claims] 1. A multi-axis auger device in which a plurality of auger shafts each provided with a main excavation bit at each tip thereof are connected to an auger drive device in parallel at a required interval from each other. In the lower part of the auger shaft, a support frame that rotatably supports these auger shafts is provided over each auger shaft,
In this support frame, a sub-drilling bit rotary shaft provided at a position where the sub-drilling bit that scrapes off the remaining undrilled portion formed by the main drilling bit does not interfere with the main excavating bit is provided between the auger shafts. A multi-axis auger device in which the sub-digging bit rotary shaft is hung and connected parallel to the auger shaft, and the sub-digging bit rotary shaft is operatively connected to the auger shaft by interlocking means provided in the support frame. 2. The multi-shaft according to claim 1, wherein the support frame rotatably supports each auger shaft by a radial bearing and a thrust bearing provided between the support frame and each auger shaft. Auger device. 3. The multi-axis auger device according to claim 1, wherein the interlocking means includes a gear provided on the sub-digging bit rotary shaft and a gear provided on the auger shaft so as to mesh with the gear.