JP4378751B2 - Drill hole bending correction device - Google Patents

Description

  The present invention relates to an excavation hole bending correcting device during excavation of a rotary excavator such as an earth auger.

  Conventionally, for example, in a rotary excavator such as an earth auger in which a crawler supports a leader mast vertically and the upper end of a screw auger is connected to a rotary drive unit such as a motor supported to be movable up and down on the leader mast. If the excavation direction of the screw auger bends due to the condition in the ground or the presence of obstacles while excavating the vertical vertical hole in the ground by rotation, the screw auger is pulled up to the required height and then bent There is a known method of excavating the screw auger by inclining the leader mast or moving the crawler according to the direction and bending angle, but this method is large and dangerous. However, there was a difficulty in correcting the excavation direction.

Therefore, in an excavator in which a hollow work rod transmitted from the rotation drive unit is supported to be raised and lowered on a work rod support body standing on the ground, an excavation head is attached to the lower end of the work rod. The shaft extension line is connected in a universal direction so as to be swingable and rotatable, and a drilling head support rod is rotatably passed through the shaft center of the drilling head. A driving means for connecting the upper end of the head support rod with a swing mechanism that swings the excavation head by the vertical movement of the swing operation rod so as to be able to transmit the rotation, and for vertically moving the swing operation rod; An excavation direction correcting device for an excavation work rod in an excavator provided with a rotating drive means has been proposed. (See Patent Document 1)
JP 7-113389 A

  However, the method of Patent Document 1 has a complicated apparatus, such as mounting another motor for bending correction, providing a swing operation rod, and providing a mechanism for rotating the rod independently.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an excavation hole bending correcting device which can avoid the complication of the apparatus and can also automate the operation and be surely corrected.

Means to solve the problem

  As a means for solving the above-mentioned problems, the present invention provides a rotary excavator such as an earth auger. An excavation hole bending correcting apparatus and method characterized by comprising a retractable reaction force plate that can be accommodated and having a mechanism for projecting the reaction force plate once in a specific section once per revolution in synchronization with the rotation of the excavation head. .

  As a result, when bending in the excavation direction is detected, if the reaction force plate is synchronized with a specific rotational position at the outer edge in the inclined direction and expanded or contracted, excavation of the obstacle or hard ground side proceeds due to the reaction force. The bend can be corrected.

The invention's effect

  According to the present invention, as compared with the method of Patent Document 1, the construction of the apparatus can be avoided, and when the bending occurs in the excavation direction, the excavation direction is corrected and the construction is performed. It is possible to avoid a dangerous operation with a large scale such as pulling up.

  Further, according to the present invention, since the direction can be automatically corrected, there is no unstable element such as a shift in human timing, so that the construction accuracy can be further improved and the observer needs to be always located. It can also contribute to cost reduction.

  The present invention will be described below with reference to embodiments shown in the drawings.

  FIG. 1 is a side view of an earth auger showing an embodiment of a rotary excavator used for carrying out the present invention. A self-propelled crawler-type base machine 1 is supported upright by a front support portion 2 and a stay 3. The drive unit 6 is supported by the guide rail 5 on the front side of the leader mast 4 erected in a state so as to be movable up and down, and is suspended by a wire rope 8 passing through the top sheave 7 at the upper end of the leader mast 4. The screw rod 10 is connected by way of a hydraulic swivel device 9 provided at the lower end of the output shaft of the drive unit 6, and the screw rod 10 is connected to the screw rod 10. A vertical vertical hole is excavated by an excavation head 11 at the lower end of 10.

  In addition, a hydraulic pipe (not shown) from the hydraulic swivel device 9 is provided in the screw rod 10, and is connected to a reaction force plate expansion / contraction hydraulic cylinder 12 of the excavation head 11. In addition, an inclinometer (not shown) is attached to the lower portion of the screw rod 10.

  FIG. 2 is an enlarged view of the excavation head 11 portion of FIG. 1. A hydraulic cylinder 12 is provided in the rod and screw of the excavation head 11, and the outer diameter of the excavation head 11 is enlarged at the piston portion tip of the hydraulic cylinder. A part of the reaction plate 13 that protrudes larger in diameter and that can be accommodated within the outer diameter of the excavation head 11 when reduced is provided.

  FIG. 3 is a conceptual diagram of reaction force plate expansion / contraction and a bending correction conceptual diagram of the present invention, and a detection signal of an inclination angle and an inclination direction from the inclinometer is sent to the ground and set based on this signal When the inclination angle is greater than or equal to the inclination angle, the reaction force plate 13 is protruded in the vicinity specific rotation section a centering on the outermost edge b in the inclination direction of the excavation hole. And a control device (not shown) is installed that expands and contracts the reaction force plate 13 by hydraulic pressure until the detection signal falls within the set inclination angle. The expansion / contraction of the reaction force plate 13 is not limited to the hydraulic system, but may be a cam system or an electric gear system using other power, and a general system for synchronizing expansion / contraction in the specific rotation section a may be used. Moreover, it is preferable to set the area | region from the protrusion of a reaction force board to drawing-in with soil, an obstruction, etc.

  Next, the operation of the embodiment will be described with reference to FIGS.

  First, the base machine 1 is moved to the vicinity of the ground to be drilled, the drive unit 6 is driven to rotate the screw rod 10, and the excavation head 11 connected thereto is rotated to rotate the excavation head 11. While excavating the ground, the wire rope 8 is loosened, the screw rod 10 and the excavation head 11 are lowered by their own weight, and excavation proceeds.

  During the excavation, the screw rod 10 is lowered while applying the weight of the screw rod 10 to the excavation head 11. However, the excavation direction may be bent during the excavation due to the state of the ground or the presence of an obstacle.

  The bend in the excavation direction is detected by an inclinometer (not shown), and the signal is constantly sent to the control device (not shown) on the ground. When the reaction force plate 13 comes to the vicinity specific rotation section a centering on the outermost edge b in the tilt direction, the pressure oil for the reaction force plate 13 to project is sent to the force plate expansion / contraction hydraulic cylinder 12 and past that section. Occasionally, hydraulic control (FIG. 3-1) for retracting the reaction force plate 13 to its original position is activated. In response to the reaction force of the reaction force plate 13, the excavation direction is corrected to the opposite side of the outermost edge b in the tilt direction (the direction of arrow C in FIG. 3-2).

  Then, until the detection signal of the inclinometer falls within the set inclination angle, the reaction plate is expanded and contracted by hydraulic pressure on the outermost edge b in the inclination direction in synchronization with the rotation of the excavating rod 11, and the detection signal of the inclinometer is If it falls within the corner, the expansion and contraction of the reaction force plate automatically stops, and after that, excavation is repeated while repeating this operation, and the construction as planned can be made possible.

  The side view which shows the earth auger which is one Embodiment of the rotary excavator in this invention.   FIG. 2 is an enlarged view of the excavation head part of FIG. 1.   The reaction force board expansion-contraction conceptual diagram and bending correction conceptual diagram of this invention. 3-1 Reaction plate ejection conceptual diagram in the vicinity specific rotation section a centering on the outermost edge b in the inclination direction in the AA cross section of FIG. 3-2 Drilling hole bending direction correction conceptual diagram in FIG. 3-1.

Explanation of symbols

6 Driving part 7 Top sheave 9 Hydraulic swivel device 10 Screw rod 11 Excavation head 12 Hydraulic cylinder 13 Reaction force plate a Specific rotation section b Outermost edge in the tilt direction c Correction direction

Claims (2)

  In a rotary excavator such as an earth auger, an expansion / contraction reaction force plate is provided at one end of the excavation head at the tip so that a part of the excavation head protrudes larger than the outer diameter of the excavation head and contracts within the outer diameter of the excavation head when reduced An excavation hole bending correcting device characterized by having a mechanism for projecting a reaction force plate once in a specific section in one rotation in synchronization with rotation of an excavation head.   In a rotary excavator such as an earth auger, a reaction plate that can be expanded and contracted is provided on the excavation head at the tip, and the reaction force plate is synchronized with the rotation of the excavation head once per round in the outer edge specific section of the excavation hole inclination direction. A method for correcting a drilling hole bend, wherein the outer diameter of the drilling head is larger than the outer diameter of the drilling head.

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