JPH07324584A - Position control device for pile erecting hole digging auger - Google Patents

Abstract

PURPOSE:To maintain the digging position of an auger screw vertically. CONSTITUTION:A bearing body 5 is installed on the rotating shaft 1 of an auger screw, and a guide lever 9 on which a support arm 8 is installed erectedly and engaged on the outside of a pile is installed on the bearing body. Also an inclinometer 16 to detect the inclination of the auger screw is installed on the bearing body 5, and pressing plates 15 and 15 which receive detection signals from the inclinometer 16, press a hole wall by moving forward and backward in the radial direction of the auger screw, and acts to correct the digging position of the auger screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a posture control device for maintaining a vertical posture of an auger screw for excavating a buried hole such as a retaining pile in a vertical direction.

[0002]

2. Description of the Related Art In constructing an underground structure portion of a building, a retaining wall in which steel pipe piles and the like are connected in a column shape is installed on the ground surrounding the building. In the facility of this retaining wall, generally, a series of operations of excavating a hole of a predetermined depth in the ground by an auger screw while inserting soil cement and inserting a steel pipe pile into the hole are repeated.

In this case, in order to improve the construction accuracy of the steel pipe pile, first, it is necessary to improve the excavation accuracy (position, verticality, etc.) of the buried hole of the steel pipe pile. As described in Japanese Patent Application Laid-Open No. 4-63167, a member that circumscribes and engages with the steel pipe pile is provided on the shaft of the auger screw, and the steel pipe pile is used as a leader to advance the excavation.

[0004]

By the way, if the strength of the ground to be excavated varies, the auger screw will dig into the weak ground, and if it hits a stone or the like, avoid it and change the direction. Will change. However, with the auger screw described above, since the posture cannot be controlled, the excavation hole bends and the required accuracy cannot be obtained. If this happens, the interference between the hole wall and the pile cannot be avoided, and the pile construction accuracy will deteriorate.

The present invention has been made in order to solve the above-mentioned conventional problems. When excavating a hole for burying a pile using a single-axis auger screw, the excavating direction of the auger screw is detected. An object of the present invention is to provide an auger screw excavation posture control device that can correct the direction of the excavation hole and improve the accuracy of the excavation hole.

[0006]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. A bearing body 5 is provided at an appropriate position, and a guide rod 9 that engages with the outer side of the steel pipe pile B is connected to a support arm 8 projecting from the bearing body 5, and the bearing bodies 5 and 5 are provided with an auger screw. An inclinometer 16 that detects the inclination of A with respect to the vertical line is installed, and a plurality of holding plates 15 that move forward and backward in the radial direction of the auger screw A and press the inner wall of the pile building hole 30 are attached to the bearing body 5. It is characterized in that it is spaced in the circumferential direction.

[0007]

[Operation] The auger screw A rotates while descending with the steel pipe pile B previously built as a guide, and the built-in hole 30
Drilling and forming. At that time, when the auger screw A is inclined with respect to the vertical line, the inclination is detected by the inclinometer 16 and sent to the ground. If the flow control valve 20 connected to the hydraulic cylinders 13 and 13 is adjusted based on the direction and degree of the detected inclination, the presser plate 15 provided on the hydraulic cylinders 13 and 13 is correspondingly changed by the auger screw A. The pressing plates 15 and 15 that have been adjusted to move back and forth in the radial direction press the inner wall of the building hole 30, and the rotating shaft 1 is displaced by being pushed in the opposite direction of the inclination by using it as a reaction force. Then, the auger screw A is returned to the vertical posture.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of an essential part showing one embodiment,
FIG. 2 is a plan cross-sectional view showing a state during construction by the same device.

In the figure, A is an auger screw for excavating a building hole 30 of a steel pipe pile B, and a spiral blade 2 is provided over almost the entire length of a rotary shaft 1, and an excavating blade 3 is provided at the tip. There is. An interrupted portion 4 is formed by removing the spiral blade 2 over each required length at appropriate places in the upper and lower intermediate portions of the spiral blade 2. The rotary shaft 1 at that portion is fitted onto the rotary shaft. Bearing body 5 is provided.

A bracket 6 is provided so as to project from each of the bearing members 5, and a base end portion of a support arm 8 is rotatably coupled to the bracket 6 via a horizontal shaft 7 (see FIG. 2). A guide rod 9 extending in parallel with the rotation axis is connected to the distal ends of the arms 8 and 8. The guide rod 9 is to be engaged with the steel pipe pile B previously built, and the pile main pipe 10 of the steel pipe pile B.
Structure in which a groove-shaped portion 9a joined to the outside of the male joint material 11, which is one of the joints provided on the outside surface of the pile, and subsequently backing plate portions 9b, 9b joined to the outside of the pile main pipe 10 are extended Has become.

Further, a plurality of hydraulic cylinders 13, 13 are provided on the bearing body 5 so as to project at equal intervals in the radial direction 3. The piston 14 of the hydraulic cylinder 13 is in contact with the inner wall of the building hole 30. A pressing plate 15 that presses the rotary shaft 1 is provided so as to move forward and backward in the radial direction of the rotary shaft 1 by hydraulic operation. Further, in a suitable place of the bearing body 5, for example, on one hydraulic cylinder 13,
An inclinometer 16 for electrically detecting the inclination of the rotary shaft 1 with respect to the vertical line is attached.

The guide rod 9 is provided with a protective pipe 17 along the recessed connecting portion between the groove-shaped portion 9a and the contact plate portions 9b, 9b, and the hydraulic pipes 18 and the inclination of the hydraulic cylinders 13, 13 are provided. A total of 16 signal lines 19 are routed through the protection pipe 17 to the ground.

An example of the control system including the inclinometer 16 and the hydraulic cylinders 13 and 13 will be described. As shown in FIG. 3, the hydraulic cylinders 18 and 18 connected to the hydraulic cylinder 13 are hydraulically connected via a flow control valve 20. A signal line 19 connected to the pump 21 and connected to the inclinometer 16 indicates an inclinometer based on the detected inclination of the rotary shaft 1.
It is connected to a controller 22 which opens and closes a flow control valve 20 in response to a signal from 16, and three hydraulic cylinders 13, 13 are operated in association with each other. In addition,
The above control operation may be performed manually.

When installing the steel pipe piles B, B, as shown in FIG.
As shown in FIG. 1, first, the first building hole 30 is cut by an auger screw and filled with soil cement, and then the first steel pipe pile B ₁ is built as a reference pile. Next, using the steel pipe pile B ₁ as a guide, the auger screw A is rotated and lowered to form the next building hole 30, and the next steel pipe pile B is
₂ are connected to each other by fitting the male joint material 11 and the female joint material 12,
Build in. By repeating the above work, the steel pipe pile B ₁ ~
B _n linked construction is done. FIG. 2 shows the construction of the auger screw A using the next steel pipe pile B ₂ as a guide.

To excavate the building hole 30 with the auger screw A, the guide rod 9 is placed along the male joint material 11 and the pile main pipe 10, and the rotary shaft is pushed down while being rotated. The digging hole 30 was dug down, and the excess soil cement was carried upward by the rotation of the spiral wing and carried out to the ground.
The building hole 30 will be formed. At that time, if the auger screw A tilts with respect to the vertical line due to changes in geology such as hardness and softness, the tilt is measured by an inclinometer.
16 and the signal will be sent to the controller 22. The controller 22 operates the oil amount control valve 20 connected to each hydraulic cylinder 13 on the basis of the signal from the inclinometer 16 to adjust the amount of oil required for advancing / retreating the holding plates 15, 15. As the pressing plates 15 and 15 move back and forth, the rotary shaft 1 is pushed in the direction opposite to the inclination, and the auger screw A is always controlled to be in a vertical posture.

[0016]

As described above, according to the present invention,
When excavating a pile building hole with an auger screw, if the auger screw tilts with respect to the vertical line, the tilt is detected by the inclinometer, and the holding plate provided on the auger screw is activated accordingly. This pushes the hole wall to correct the posture of the auger screw, and the auger screw can always continue excavation while maintaining the vertical posture. As a result, the built-in hole of the pile is formed in a vertical state, and the interference between the hole wall and the pile, which is apt to occur due to the bending of the excavation hole as in the past, is avoided, and the pile construction accuracy can be improved. .

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the device of the present invention.

FIG. 2 is a plan sectional view showing the construction state.

FIG. 3 is an explanatory diagram showing an example of the operation of a presser plate.

[Explanation of symbols]

 A Auger screw B Steel pipe pile 1 Rotating shaft 2 Spiral blade 3 Drilling blade 4 Interruption part 5 Bearing body 8 Support arm 9 Guide rod 10 Pile main pipe 11 Male joint material 12 Female joint material 13 Hydraulic cylinder 14 Piston 15 Presser plate 16 Inclinometer 17 Protective pipe 18 Hydraulic conduit 19 Signal line 20 Flow control valve 21 Hydraulic pump 22 Controller 30 Built-in hole

Claims (1)

[Claims] A bearing body is provided at an appropriate position between the upper and lower sides of the rotation shaft of the auger screw, and a support arm protruding from the bearing body is coupled with a guide rod that engages with the outer side of the steel pipe pile.
In addition to installing an inclinometer that detects the inclination of the auger screw with respect to the vertical line, separate a plurality of holding plates that move forward and backward in the radial direction of the auger screw and press the inner wall of the pile building hole in the circumferential direction of the bearing body. Characterized by having been set up,
Posture control device for pile building hole drilling auger.