JPH0346613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an earth auger device for excavating a vertical hole in the ground for forming an earth retaining wall using an auger that moves up and down guided by a leader mast supported by a boom. .

B. Prior art Conventionally, in order to efficiently drill continuous vertical holes,
Multiple augers are provided in which two, three, four, etc. augers are driven in parallel. By the way, when such multiple augers are used to form a continuous vertical hole 35 in the ground as a pilot hole for an earth retaining wall as shown in Figure 9a, the distance between the augers increases due to the excavation resistance underground. If the vertical holes are narrowed, the vertical holes are not continuous, and there are places where a layer of soil remains between the vertical holes. Therefore, when cement milk is poured into such vertical holes to form earth retaining walls, as shown in Figure 9b, Disconnected portion 35 on the wall of continuous column row 38 made of cement layer
a. In other words, a gap is created. If this gap is Horikatashiki 3
If it is 6 or more, when digging a pilot hole for constructing the underground part of a building, groundwater will infiltrate, causing problems in digging the pilot hole, and sometimes making it impossible to dig.

C. Problems to be Solved by the Invention The present invention has been provided by focusing on the problems in excavation by the conventional device, and it is possible to open both outer augers from a parallel state among a plurality of multiple augers. By doing so, it is an object of the present invention to obtain an earth auger device capable of forming an excavated hole into a plate-shaped continuous hole.

D. Means for Solving the Problems The present invention, as illustrated in FIGS. 1 to 4, provides a plurality of augers 7, The drive motors 11, 12 for the outer augers 8, 9 are mounted, and the drive motors 11, 12 for the outer augers 8, 9 are mounted.
12 supporting bodies 13 and 14 are supported on a fulcrum so that they can swing laterally, and the augers 8 and 8 on both outer sides are supported around this fulcrum.
9, or one of the augers is provided with an opening/closing means that can freely open and close one of the augers from a parallel state to the side.

E. Operation Using the above-mentioned apparatus, first, three continuous vertical holes 35 are drilled in the ground as shown in FIG. 8a, with the augers 7, 8, and 9 kept parallel. Then, as shown in FIG. 8b, an opening/closing means (for example, a device consisting of hydraulic cylinders 19 and 20) is installed at a position slightly below the trench 36.
The outer augers 8 and 9 are opened outward about the fulcrum (pin 15). In this state, auger 7, 8,
When 9 is pulled upward, as shown in Figure 8c,
A plate-shaped vertical hole 37 is drilled above the continuous vertical hole 35. Of course, in this case, the open auger is moved up and down to remove the uncut portion 35a remaining in the continuous vertical hole 35. During the above excavation, cement milk is supplied from the lower end of each auger and mixed with excavated sand to form earth retaining walls in the holes 35 and 37, but the area above the excavation bed 36 is completely blocked by a board. It becomes a shaped wall. In addition, when making a pilot hole for a building, the earth retaining wall was formed in a square shape, but in the corners of the square, the auger was in a parallel vertical state.
Vertical hole excavation work is difficult because the leader mast, head sheave, drive motor, etc. are close to adjacent structures. Even in such a case, since the above device allows the outer augers 8 and 9 to be opened, excavation can be performed by placing only the tip of the outer auger at the corner, so that the retaining wall at the corner can maintain its complete and accurate shape. Can be formed.

F. Example Example 1 will be described with reference to FIGS. 1 to 4. Reference numeral 1 denotes a leader mast that is erected by a boom 2, and a parallel guide rod 3 is provided in the vertical direction on the leader mast. Reference numeral 4 denotes an elevating frame that is attached to the guide rod 3 so as to be slidable up and down by holding the arm portion 5, and is raised and lowered by a main rope 6 that is fed out through a head sheave at the upper end of the leader mast 1. 7 is a central auger, 8 and 9 are outer augers, and these constitute a triple auger, and the drive motor 1 of the central auger 7
0 is fixed to the lifting frame 4, and each support body 1 of each drive motor 11, 12 of the outer auger 8, 9
3 and 14 are fulcrum supported by pins 15 and 15 at the upper part so as to be able to swing laterally. If there are five augers, four of the outer augers will be supported by the fulcrum. Reference numeral 16 denotes a cylindrical body provided at the bottom of the central auger 7 that cannot be moved in the axial direction and is only rotatable, and 17 and 18 are provided at the bottom of the outer augers 8 and 9, respectively, at approximately the same height as the cylindrical body 16 and are immovable in the axial direction. It is a cylindrical body that can only rotate freely. A hydraulic cylinder 19 serves as a means for opening and closing the outer auger 8. The head of the cylinder is pivotally connected to a pin 21 on the left outer side of the cylinder 16, and the piston rod 19a is pivotally connected to a pin 21 on the inner side of the cylinder 17. ing. A hydraulic cylinder 20 serves as a means for opening and closing the outer auger 9. The head of the cylinder is pivotally connected to a pin 22 on the right outer side of the cylinder 16, and the piston rod 20a is pivotally connected to a pin 22 on the inner side of the cylinder 18. ing. The pins 20 and 21 are parallel to each other and are provided perpendicular to the axis of each auger.
Reference numeral 23 denotes a non-slip device for the augers 7, 8, and 9, which is attached to the guide rod 3 by an arm portion 23c so as to be slidable up and down, and is raised and lowered by a sub-route 24. The center tube 23a of this anti-skid device fits into the center auger 7, and the outer tube 23b is open at its outer end and has a structure that does not interfere with the opening of the outer augers 8, 9. 25 is a digging claw, and 26 is a stirring protrusion. Reference numeral 27 denotes an oil supply hose, which is connected to a branch circuit of the hydraulic unit of the drive motor.

In this device, when oil is supplied and the piston rods 19a, 20a of the hydraulic cylinders 19, 20 are extended from the parallel state of the augers as shown in FIG. Open in the shape of . In this case, for example, if only the piston rod 19a is extended, only one of the outer augers 8 opens laterally. Then, when the piston rod is retired, each auger is aligned to its original parallel state.

Example 2 according to FIGS. 5, 6 and 7
Explain. Reference numeral 28 denotes a connecting link provided by a pin 30 between the left outer part of the cylinder 16 and the inner protrusion 17a of the ring body 17, and 29 indicates the link between the right outer part of the cylinder 16 and the inner protrusion 17a of the cylinder 18 This is a connecting link interposed between 18a by a pin 31. Auger 7, 8,
9 are in a parallel state, as shown in FIGS. 5 and 6, the central cylinder 16 is in an upper position relative to the cylinders 17 and 18 at the same height, and the links 28 and 29 are in a figure eight position. The central digging claw 25a is located at a lower position than the outer digging claws 25. 32 is lift frame 4
A lip-shaped guide frame is provided vertically in the center of the guide frame, and inside this lip, as shown in FIG. The lower end of a piston rod 34a of a hydraulic cylinder 34, which is fixed to the upper part 4a of the lifting frame 4 in a hanging state, is connected to the upper part of the motor 10. In this device, when the auger is in a parallel state as shown in FIG. 5, when the lateral vibration prevention pins 23c at both open ends of the rest stop device 23 are removed and the drive motor 10 is pushed down by the hydraulic cylinder 34, The central auger 7 is lowered and the connecting links 28,2
9 is stretched laterally, and the outer augers 8 and 9 open to both sides about the pin 15, respectively. Conversely, when the drive motor 10 is pulled up, each auger returns to its original parallel state.

G Effect The present invention supports the support body of the drive motor of the outer auger among the plurality of auger drive motors mounted on the lifting frame as a fulcrum to enable it to swing laterally, so that the outer auger can be opened from a parallel state. After drilling continuous vertical holes in a parallel state, by opening the outer auger and raising or lowering it, it is possible to form a plate-shaped vertical hole by removing the discontinuous parts that remain between the continuous vertical holes, and also to form vertical holes at the corners. It can be easily excavated, allowing the construction of earth retaining walls that do not allow water to infiltrate.

[Brief explanation of drawings]

Fig. 1 is a front view of Embodiment 1 of the present invention, Fig. 2 is a side view of the same, Fig. 3 is an enlarged front view of the main parts of the above, and Fig. 4 shows the outer auger of the above in the open state. 5 is a front view of Embodiment 2, FIG. 6 is a front view of the main parts of the above, FIG. 7 is a top view of the central drive motor section of the above, and FIGS. 8 a, b, and c are the above. An explanatory diagram of the order of work steps when excavating a hole in the ground using the embodiment, and FIGS. 9a and 9b are a top view and a front view of an earth retaining wall according to a conventional example.

Claims (1)

[Claims] 1 Multiple auger drive motors are mounted on a lifting frame that moves up and down guided by the guide rod of the leader mast, and the support body of the outer auger drive motor is supported as a fulcrum so that it can swing laterally, and the An ass auger device characterized by being provided with opening/closing means that can freely open and close both outer augers or one auger from a parallel state to the side.