JPH0786300B2 - Variable drilling head - Google Patents

Description

TECHNICAL FIELD The present invention relates to a variable excavating head for an auger used when excavating a pile hole such as a foundation pile.

(Prior Art) Conventionally, when excavating a pile hole with a different excavation diameter, such as excavating the bottom of a pile, an auxiliary blade is attached to the shaft vertically provided in the excavation head, and the auger shaft is rotated in reverse. There was one that opened the auxiliary blade protruding sideways.

(Problems to be Solved by the Invention) According to the above-mentioned conventional technique, in order to change the excavation diameter of the auxiliary blade, the excavation head is once taken out and the stopper of the auxiliary blade is adjusted, or it is remotely controlled by hydraulic pressure or the like. There was one that changed the amount of protrusion of the digging blade dynamically and forcibly. The former has a problem that the work is interrupted on the way and takes time and labor, and the latter requires a complicated device and its reliability is unclear.

(Means for Solving the Problems) However, according to the present invention, the auger shaft is provided with the supporting rod in the horizontal direction, the swingable connecting rod is provided, or the slidable horizontal rod is provided. Solved.

That is, according to the present invention, a support rod is installed in the upper part of the shaft rod of the excavating head connected to the lower end part of the auger shaft in a direction perpendicular to the center line, and at both ends of the support rod, the tip end is excavated. The base end side of the connecting rod having a protruding blade is rotatably installed, and the shaft rod is provided with an expansion limiting stopper of the connecting rod, and the lower end of the connecting rod is a semi-circular plate or parallel. It is a quadrilateral variable excavation head. Further, a supporting rod is installed above the shaft rod of the excavating head connected to the lower end of the auger shaft at a right angle to the center line, and the base end side of the connecting rod is rotated by the projecting portions at both ends of the supporting rod. Erected as much as possible, a swinging stopper of the connecting rod is provided on the shaft rod, the upper end of the movable plate is pin-connected to the lower end of the connecting rod, and the excavating blade is projectingly provided on the lower end of the movable plate. A variable excavating head characterized in that a supporting rod is erected in the direction perpendicular to the center line on the upper part of the axial rod of the excavating head connected to the lower end of the auger shaft, and both ends of the supporting rod are projected. A variable excavating head is characterized in that a pair of horizontal rods provided with protruding excavating blades are erected slidably in a direction parallel to the support rods at the lower end of the portion.
Further, it is a variable excavating head in which the tip of the excavating blade is formed outward with respect to the shaft rod.

The support rod and the shaft rod are attached by fixing the support rod through the shaft rod by welding or by welding or other method.

(Operation) According to the present invention, by rotating the auger in one direction, the connecting rod swings to the expansion limiting stopper on one side, and when the auger rotates in the opposite direction, the connecting rod expands on the other side. Swing to the limit stopper. Also, due to the rotation of the auger,
The horizontal rod slides to the stopper on one side, and when the auger is rotated in the opposite direction, the horizontal rod slides to the stopper on the other side. Therefore, the opening degree can be changed by changing the rotation direction.

(Example 1) The shaft rod 3 of the excavation head 2 is continuously provided at the lower end of the auger shaft 1.
A support rod 4 is erected on the upper portion of the shaft rod 3 in a direction perpendicular to the center line of the shaft rod 3 so that the end portions 4a and 4b of the support rod 4 project to the outside of the shaft rod 3. Ends protruding from both sides of the support rod 4.
The base ends of the connecting rods 5 and 6 are rotatably installed on 4a and 4b, respectively. The lower ends 5a and 6b of the connecting rods 5 and 6 are respectively provided with semi-circular arc-shaped plates, the arc-shaped portions of which are directed downward, and the arc-shaped lower ends of the connecting rods. Excavating blades 7, 7, 8 and 8 are respectively provided on 5a and 6a so as to project downward. The drilling blades 7, 8
The tip of the blade forms a blade on the outside with respect to the shaft rod 3.

Further, expansion limiting stoppers 9 and 10 for limiting the swinging amplitude of the connecting rod 5 are provided near the base end side of the connecting rod 5 of the shaft rod 3. The expansion limiting stopper 9 limits the swing of the connecting rod 5 to one side, and the expansion limiting stopper 10 swings to the other side with a smaller amplitude than the vibration by the expansion limiting stopper 9. To limit. Similarly, expansion limiting stoppers 11 and 12 for limiting the swinging of the connecting rod 6 are provided on the shaft rod 3.

The expansion limiting stopper 11 limits the swing of the connecting rod 6 with a smaller amplitude than the expansion limiting stopper 12. Further, the expansion limiting stoppers 9 and 11 and the expansion limiting stoppers 10 and 12 are provided at positions symmetrical with respect to the shaft rod 3, respectively.

A fixing plate 13 is provided at the lower end of the shaft rod 3 so as to project therefrom.
The excavating blades 14, 14 are provided at the lower end of the protrusion 13 so as to project downward to form the excavating head 2.

Next, the operation of each part will be described based on the above embodiment.

First, when the auger shaft is rotated in the direction of arrow 15 in FIG. 4,
The excavating head 2 also rotates in the same direction, and the connecting rods 5 and 6 are indicated by arrows 1.
It swings in the directions of 6 and 17, respectively, and the expansion limit stoppers 10 and 11
Abut. If you continue to rotate the drilling head 2,
Fig. 4 Pile holes with a diameter of chain line 18 can be excavated.

Next, when the auger shaft 2 is rotated in the direction of arrow 19, the excavating head 2 is also rotated in the same direction, the connecting rods 5 and 6 swing in the directions of arrows 20 and 21, respectively, and the expansion limiting stopper 9 , 12 contact. If the rotation is continued as it is, a pile hole having a diameter as indicated by a chain line 22 in FIG. 6 can be excavated.

Further, although the lower ends 5a, 6a of the connecting rods 5, 6 are formed in a semi-circular plate type in the above embodiment, parallelogram plates are continuously provided as shown in FIG. The excavating blades 7, 7, 8 and 8 can also be provided so as to project substantially radially.

Further, in the above-mentioned embodiment, the excavating blades 7 and 8 are directly provided on the lower end portions of the connecting rods 5 and 6, but as shown in FIG. 7, the semicircular plates are attached to the lower end portions of the connecting rods 5 and 6. The movable members 25 and 26 each having a circular shape and a lower side thereof can be rotatably connected by pins 27 and 28, respectively. The excavating blades 7, 7, 8 and 8 are provided at the lower ends of the movable members 25 and 26 in an arcuate shape so as to project downward.

(Example 2) The shaft rod 3 of the excavation head 2 is connected to the lower end of the auger shaft 1,
A support rod 4 is erected on the upper portion of the shaft rod 3 in a direction perpendicular to the center line of the shaft rod 3 so that the end portions 4a and 4b of the support rod 4 project to the outside of the shaft rod 3.

Next, the tubular bodies 29, 30 each having a notch on the lower side wall are provided horizontally, and the tubular bodies 29 provided horizontally at the lower ends of the end portions 4a, 4b of the support rod 4,
Fix the tops of 30 respectively.

Next, a horizontal rod 34 having a projection 31 that fits on the inner wall of the tubular body 29 formed at the top is attached from the notch of the tubular body 29, and the projection 31 and the tubular body 29 are slidably fitted. In the same manner as above, a horizontal rod having a protrusion 32 formed on the upper portion for fitting with the inner wall of the tubular body 30 is formed.
35 is attached from the notch of the tubular body 30, and the protrusion 32 and the tubular body 30 are slidably fitted. Excavating blades 7, 7, 8 and 8 are respectively provided on the lower ends of the horizontal rods 34 and 35 so as to project downward. The tips of the excavating blades 7 and 8 are directed outward with respect to the shaft rod 3.

Further, similarly to the first embodiment, a fixing plate 13 is projectingly provided at the lower end of the shaft rod 3, and the excavating blades 14, 14 are provided at the lower end of the fixing plate 13.
To project downward to form the excavation head 2.

Next, the operation will be described based on the above embodiment.

In FIG. 10, when the auger shaft is rotated in the direction of arrow 38a, the excavating head 2 is also rotated in the same direction, and the horizontal rods 34 and 35 are respectively indicated by arrow 36,
It slides in the direction of 37 and reaches the positions of 34a and 35a in FIG. 10 by a stopper (not shown).

Further, when the auger shaft 1 is rotated in the direction of the arrow 38b, the excavating head 2 is also rotated in the same direction, and the horizontal rods 34, 35 are respectively indicated by the arrows 39, 40.
And slide to the positions of 34b and 35b in FIG. 10 by a stopper (not shown).

(Effects of the Invention) The present invention is constructed such that a connecting rod having a protruding excavating blade is swingably mounted on a supporting rod penetratingly mounted on a shaft rod, or a horizontal rod having a protruding excavating blade is slidably mounted. Therefore, it is possible to easily and reliably open the connecting rod or the horizontal rod and excavate the pile hole simply by rotating the excavating head.

In addition, since the excavating blade is projected on the arc-shaped part of the lower end of the connecting rod or the two end edges of the parallelogram plate, no matter which position the connecting rod swings, the bottom side and the side wall of the anti-hole are Since both sides can be excavated, there is an effect that can be excavated efficiently.

Further, since the tip of the digging blade is formed on the outside, there is an effect that digging can be performed regardless of the rotation direction of the digging head. Furthermore, since the expansion limiting stopper can be configured to limit swing to one side and the other side with different amplitudes, the connecting rod opens with different amplitudes depending on the rotation direction of the auger shaft, making it easy to excavate pile holes with different inner diameters. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a front view of the same in operation, FIG. 4 is a plan view of the same, and FIG. 6 is a front view of another embodiment of the present invention, FIG. 8 is a front view of another embodiment of the present invention, and FIG. FIG. 9 is a side view of another embodiment of the present invention, and FIG. 10 is a plan view of the same. 1 ... Auger shaft, 2 ... Excavation head, 3 ... Shaft rod, 4 ... Support rod, 5,6 ... Connection rod, 7, 8 ... Excavation blade 9, 10, 11, 12 ... Expansion limit stopper 23, 24 …… Edge, 25, 26 …… Movable member 27, 28 …… Pin, 29, 30 …… Cylindrical body 31, 32 …… Projection, 34, 35 …… Horizontal rod

Claims (5)

[Claims] 1. A support rod is installed at an upper portion of a shaft rod of an excavating head connected to a lower end portion of an auger shaft in a direction perpendicular to a center line thereof, and a base of the connection rod is provided at both end projecting portions of the support rod. The end side is rotatably installed, an expansion limiting stopper for the connecting rod is provided on the shaft rod, and an arc-shaped plate with an arc-shaped portion directed downward is continuously provided at the tip of the connection rod to excavate the arc-shaped portion. Variable drilling head characterized by protruding blades 2. A support rod is installed above the shaft rod of the excavating head which is connected to the lower end of the auger shaft in a direction perpendicular to the center line, and the base of the connection rod is provided at both end projections of the support rod. The end side is rotatably installed, the expansion limit stopper of the connecting rod is provided on the shaft rod, a parallelogram plate is continuously provided at the tip of the connecting rod, and two end edges of the parallelogram plate are provided. Variable drilling head characterized by having a drilling blade protruding from 3. A support rod is installed at an upper portion of a shaft rod of an excavating head connected to a lower end portion of an auger shaft at a right angle with respect to a center line thereof, and a base end of the connection rod is provided at both end projecting portions of the support rod. Side is rotatably installed, a swing stopper of the connecting rod is provided on the shaft rod, the upper end of the movable plate is pin-connected to the lower end of the connecting rod, and the excavating blade projects at the lower end of the movable plate. Variable drilling head characterized by being installed 4. A support rod is installed above the shaft rod of the excavating head connected to the lower end of the auger shaft in a direction perpendicular to the center line of the shaft. A variable excavating head, characterized in that a pair of horizontal rods having protruding blades are installed slidably in a direction parallel to the support rods. 5. The variable drilling head according to claim 1, wherein the tip of the drilling blade is formed outward with respect to the rod.