JP3453209B2 - Middle boring excavator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring excavator with a swivel joint of an all-casing excavator used for forming a foundation pile or a standing pile. 2. Description of the Related Art FIG. 5 shows a conventional all-casing excavator and a conventional excavator, and FIG. 6 shows a conventional all-casing excavator and a percussion crushing type excavator. First, an all-casing excavator and an excavating bucket will be described with reference to FIG.
2 is a casing tube for maintaining the excavated hole wall, and 3 is an excavation bucket. The casing tube 2 is clamped by the all-casing excavator 1 and pushed into the ground while rotating or swinging, while the excavation bucket 3 is operated. Then, the earth and sand in the casing tube 2 is excavated and discharged, and the casing tube 2 is penetrated to a predetermined depth to excavate a standing hole. Next, an all-casing excavator and a percussion crushing type excavator will be described with reference to FIG. 6. The excavator is used for excavating a solid rock or the like. A casing tube, 4 is a percussion crushing type excavator, 5 is a flexible hose support attached to the upper end of the casing tube 2,
6 is a flexible hose extending from a pressure fluid supply source (not shown), and the flexible hose 6 hangs down from the flexible hose support 5 in the casing tube 2,
It is connected to a swivel joint 7 attached to a percussion crushing boring excavator 4, and transmits a rotational force or a oscillating power and a pressing force from the all-casing excavator to the casing tube 2 so that the casing tube 2 and the percussion crusher are connected. While rotating or oscillating the boring excavator 4 and pushing it into the ground, the flexible hose 6 supplies a pressurized fluid (pressurized gas or liquid) to the impact crushing boring excavator 4 so that the solid rock etc. Drilling. [0004] The conventional all-casing excavator and the percussion-crushing middle-boring excavator shown in FIG.
The casing tube 2 and the impact crushing type excavator 4 are pushed into the ground while rotating or oscillating while transmitting the rotational force or the oscillating power and the pressing force to the ground. The drilling machine 4 supplies a pressurized fluid (pressurized gas or liquid) to the excavator 4 to excavate a solid rock or the like, and supplies the pressurized fluid from the ground to the percussion type excavator through the flexible hose 6. There is a need. The impact crushing type excavator 4 supplied with the pressurized fluid rotates or swings together with the casing tube 2, and the flexible hose 6 is provided with the impact crushing type excavator 4 to prevent twisting. It is necessary to connect to the upper end portion via a rotatable swivel joint 7. In order to make the swivel joint 7 rotatable, it is necessary to take a rotational reaction force by some method. In the case of FIG. 6, the swivel joint 7 is pulled with a wire rope from the flexible hose support 5 or a guide device is hung. Thus, the swivel joint 7 is supported, and a rotational reaction force is obtained by utilizing the tension of the flexible hose 6 itself generated by the displacement of the flexible hose 6. However, in recent years, foundation pile construction has been performed at a large depth (about 1
0 to 70 m) in many cases, and when the rotational reaction force is obtained by using the tension of the wire rope or the flexible hose 6 itself, as the depth increases, the inclination angle of the wire rope or the flexible hose 6 decreases, Since sufficient supporting reaction force cannot be obtained, the flexible hose 6 may be broken. Moreover, in the case of the wire rope type, it is necessary to sequentially adjust the length of the wire rope according to the increase in the excavation depth and to re-stretch the wire rope. In the method of suspending the guide device, a mechanism for extending the guide device according to an increase in the excavation depth is required. In addition, there is a problem in that the length of the guide device becomes large and the equipment becomes large. The present invention has been made in view of the above problems, and has as its object to hang a guide device that takes a reaction force of a swivel joint according to an excavation depth from a flexible hose support base or pull it with a wire rope. There is no need to take any reaction force,
An object of the present invention is to provide a middle excavator that can be constructed safely and reliably and that can improve reliability. In order to achieve the above-mentioned object, the present invention is directed to a case in which an all-casing excavator installed on the ground rotates or oscillates a casing tube which is pushed into the ground. A gripper device,
A swivel joint rotatably attached to the upper part of the gripper device, and a flexible hose having a lower end attached to the swivel joint by hanging the inside of the casing tube from a flexible hose support base attached to an upper end of the casing tube, A drilling device attached to a lower portion of the gripper device, and a pressurized fluid is supplied to the gripper device by the flexible hose, the gripper device is pressed against the inner wall surface of the casing tube, and rotation or rotation of the casing tube is performed. In a boring excavator that transmits rocking to the excavator and excavates soil in the casing tube by the excavator, a displacement detector that detects a circumferential displacement when the flexible hose is twisted; The swivel is activated by a detection signal from a displacement detection device. And comprising a swivel joint drive motor for rotating the resolving direction torsion Into. The inner excavator according to the present invention is constructed as described above. The casing tube of the all-casing excavator is rotated or swung and pushed in to maintain the excavated hole wall by the casing tube. When the gripper device is pressed against the inner wall surface of the casing tube by the pressurized fluid, the rotational force or the oscillating force and the pushing force of the casing tube are transmitted to the boring excavator, and when excavating, the extruder is dripped into the casing tube by the displacement detection device. Torsion (circumferential displacement) of the flexible hose, and rotate the swivel joint in the opposite direction to the torsion,
Prevent torsion and breakage of flexible hose. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an inner boring excavator of the present invention will be described with reference to an embodiment shown in FIGS. 1 to 4. FIG. 1 shows a casing tube of an all-casing excavating machine, and FIG. The excavator 8 comprises a swivel joint 7, a gripper device 9, a drilling device 10, and a displacement detecting device 11.
And a swivel joint rotating device 12. At the upper end of the casing tube 2,
A flexible hose support 5 is provided, and a flexible hose 6 for supplying a pressurized fluid (a pressurized gas or a pressurized liquid) from the flexible hose support 5 to the inside excavator 8 hangs down in the casing tube 2. The flexible hose support 5 has a double structure having an inner cylinder and an outer cylinder. There is a bearing between the inner cylinder and the outer cylinder. Even if the casing tube 2 rotates, the outer cylinder rotates from the ground. By taking the reaction force, the inner cylinder rotates and the outer cylinder does not rotate. Therefore, the flexible hose 6 is not twisted or pulled. FIG. 2 is a longitudinal sectional side view showing details of the displacement detecting device 11, FIG. 3 is a cross-sectional plan view taken along the line AA of FIG. 2, and FIG. It is a top view. The displacement detecting device 11 includes a displacement tuning lever 13, a displacement tuning lever neutral holding springs 14, 14, and limit switches 15, 15, and the displacement tuning lever 13 has a hole through which the flexible hose 6 passes. When the displacement tuning lever 13 moves following the displacement of the flexible hose 6 and moves to a specified amount, the limit switch 15 is pushed and the displacement of the flexible hose 6 is detected. When the limit switch 15 detects the displacement of the flexible hose 6, the limit switch 15
A switching signal is sent from the controller to the switching valve 16 (see FIG. 2), the swivel joint drive motor 17 operates, the displacement tuning lever 13 moves away from the limit switch 15, and the switching valve 16
Becomes the neutral position (motor stop position). A motor mount 19 is mounted on the outer cylindrical portion 18 of the swivel joint 7, and a swivel joint drive motor 17 is mounted on the motor mount 19, and is mounted on an output shaft of the swivel joint drive motor 17. The pinion 20 meshes with the gear 22. Reference numeral 21 denotes a shaft portion of the swivel joint 7;
Is a swivel joint mount that rotatably supports the swivel joint 7 via the coaxial portion 21, 23 is a gear mount fixed to the swivel joint mount 24, and the gear 22 is fixed to the gear mount 23. I have. Next, the operation of the inside excavator shown in FIGS. 1 to 4 will be specifically described. At the time of excavation, the casing tube 2 of the all-casing excavator is rotated or swung and pushed in, and the excavated hole wall is maintained by the casing tube 2, while the gripper device 9 is moved to the inner wall surface of the casing tube 2 by the pressurized fluid. Pressing, transmitting the rotational force or the oscillating power and the pushing force of the casing tube 2 to the boring excavator 8, and excavating the outer cylinder of the flexible hose support 5, the flexible hose 6, and the outer cylinder of the swivel joint 7. If not, the flexible hose 6 will be twisted. However, as shown in FIG. 4, when the amount of displacement of the flexible hose 6 reaches a specified amount, the displacement tuning lever 13 that moves following the displacement of the flexible hose 6 comes into contact with the limit switch 15, and the switching valve 16 switches. As a result, the swivel joint drive motor 17 rotates and the motor 1
The pinion 20 of 7 rotates the motor mount 19 and the outer cylinder 18 of the swivel joint 7 by using the gear 22 as a reaction force. At this time, the rotation directions of these portions are, of course, opposite to the torsion of the flexible hose 6. Displacement tuning lever 1 of displacement detection device 11
Numeral 3 is attached to a flexible portion (upper portion of the displacement detection device mounting base 25) of the flexible hose 6, and the flexible hose 6 is twisted (displaced in the circumferential direction).
Is easily detected. In short, the boring excavator of the present invention rotates or oscillates and pushes the casing tube 2 of the all-casing excavator so that the excavated hole wall is maintained by the casing tube 2 while the gripper is driven by the pressure fluid. When the device 9 is pressed against the inner wall surface of the casing tube 2, the rotational force or the oscillating force and the pushing force of the casing tube 2 are transmitted to the boring excavator 8, and when excavating, the displacement detecting device 11 enters the casing tube 2. The torsion (circumferential displacement) of the hanging flexible hose 6 is detected, and the swivel joint 7 is rotated in the opposite direction to the torsion to prevent the flexible hose 6 from being twisted and cut. As described above, the boring excavator of the present invention rotates or oscillates and pushes the casing tube of the all-casing excavator to maintain the excavated hole wall by the casing tube while maintaining the pressure fluid. The gripper device is pressed against the inner wall surface of the casing tube, and the rotational force or the oscillating force and the pushing force of the casing tube are transmitted to the boring excavator, and when excavating, a flexible hose suspended from the displacement detection device into the casing tube. The torsion (circumferential displacement) is detected, and the swivel joint is rotated in the opposite direction to the torsion to prevent torsion and breakage of the flexible hose. Guide device that takes the reaction force of There is no need to take a reaction force by pulling with a wire rope, so that construction can be performed safely and reliably, and reliability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional side view showing an embodiment of a middle excavator of the present invention. FIG. 2 is a vertical sectional side view showing details of a displacement detection device of the middle boring excavator. FIG. 3 is a cross-sectional plan view taken along line AA of FIG. 2; FIG. 4 is a plan view showing an arrow B part in FIG. 3; FIG. 5 is a vertical sectional side view showing a conventional all-casing excavator and a drilling bucket. FIG. 6 is a vertical sectional side view showing a conventional all-casing excavator and a percussion crushing middle excavator. [Description of Signs] 2 Casing tube of all casing excavator 5 Flexible hose support 6 Flexible hose 7 Swivel joint 8 Middle excavator 9 Gripper device 10 Excavator 11 Displacement detector 12 Swivel joint drive motor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-103592 (JP, A) JP-A-5-33340 (JP, A) JP-A-6-101225 (JP, A) JP-A-5-103225 14232 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21B 7/20 E21B 19/00

Claims (1)

(57) [Claims 1] A gripper device located in a casing tube pushed into the ground while being rotated or rocked by an all-casing excavator installed on the ground, and an upper portion of the gripper device. A swivel joint that is rotatably mounted, a flexible hose that hangs down the inside of the casing tube from a flexible hose support that is attached to the upper end of the casing tube, and a lower end that is attached to the swivel joint, and a lower part of the gripper device. A pressure fluid is supplied to the gripper device by the flexible hose, the gripper device is pressed against the inner wall surface of the casing tube, and the rotation or swing of the casing tube is controlled by the drilling device. And the drilling rig In a middle boring excavator for excavating sand, a displacement detection device that detects a circumferential displacement when the flexible hose is twisted, and the swivel joint is activated by a detection signal from the displacement detection device and twists the swivel joint in a direction to eliminate the twist. A middle boring excavator comprising a rotating swivel joint drive motor.