JP2726988B2 - Center deviation prevention device for ground excavator and pin used in the device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of excavation and relates to a center deviation prevention device for a ground excavator and a pin used for the device.

[0002]

2. Description of the Related Art Conventionally, a co-rotating shaft which is rotatably fitted on an excavation shaft of a ground excavator and has a blade plate having a diameter larger than the diameter of a drilling blade disposed at the shaft head of the excavation shaft is evenly arranged. Although a prevention structure is provided, the co-rotation prevention structure does not escape from the cut position after cutting into the hole wall surface of the drilling hole,
Once the center deviates once due to external force during excavation, the eccentric state tends to increase, and even if the stirring ability is excellent, there is a drawback that power loss and reduction in construction accuracy are caused. On the other hand, an apparatus for preventing center deviation in a ground excavator according to the prior art of the applicant of the present invention (Japanese Utility Model Laid-Open No. 4-138490) has a circular arc surface of a pin in which the center of an excavation axis is evenly disposed with respect to the center. (Including a conical surface), so that it is hard to be eccentric, and even if an external force is applied to the eccentric state, the center of the pin is located at the same diameter as the excavation diameter of the excavator blade Therefore, against the external force due to the obstacle in the excavation direction, the obstacle is pressed into the hole wall by the cone of the pin and the center is held, and the external force due to the obstacle in the rotation direction is generated at the time of excavation Due to the rotation of the arm by the rotational flow energy of the mixture of the excavated soil and the solidified material, the obstacle is pressed into the hole wall surface via the arc surface of the pin to hold the center of the excavation axis, and depending on the energy, An intractable obstacle In this case, the arm is stationary and attempts to maintain the center of the arm. Thus, the center of the excavation axis is extremely excellent (in other words, prevention of center deviation). It is undeniable that the stirring ability is reduced at the point where it rotates around the axis.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above,
An object of the present invention is to provide a center deviation preventing device for a ground excavator capable of improving the stirring ability without impairing the center deviation preventing function, and a pin used for the device.

[0004]

Therefore, when a construction test of a pile is carried out by incorporating a vane plate, which infers that the rotational flow energy will be suppressed to some extent by the resistance in the wall surface of the hole, into a center misalignment prevention device, the center misalignment can be prevented. It was considered from the wear mark of the pin that the co-rotation of the center deviation preventing device was extremely gentle rotation without impairing the function. Therefore, the center deviation prevention device in the ground excavator of the first invention is configured such that the required number of arms are evenly extended to the boss which is vertically positioned at the required position of the excavation shaft and is rotatably fitted to the boss, and In a center misalignment prevention device in which a pin of a required diameter having an axial center is vertically installed at the same diameter position as the excavation diameter of the excavation wing arranged at the head of the excavation shaft, the boss is excavated at a required angle with the arm. A blade plate having an outer end having a diameter larger than the diameter is integrally formed symmetrically with respect to the axis of the excavation shaft.

The center deviation prevention device for a ground excavator according to a second aspect of the present invention is arranged such that a required number of arms are evenly extended to a boss which is vertically positioned at a required position of an excavation shaft and is rotatably fitted to the excavation shaft. On the other hand, in a center deviation prevention device that has a pin with a required diameter that has an axis centered at the same diameter position as the excavation diameter of the excavation wing arranged at the shaft head of the excavation shaft, it is symmetrical with respect to the axis of the excavation shaft A wing plate having an outer end having a diameter larger than the excavation diameter is integrally extended at a required angle with respect to the arm above a pin disposed at the position.

The pin used in the center deviation preventing device of the third invention is a pin having a required diameter and a required length, a conical portion below the round shaft, and an upper conical portion above the round shaft. At least on the lower surface of the required cross section in the outward direction, the wing portion has an inclined surface rising upward toward the outer end and integrated with the required length.

[0007]

[Function] A portion having a diameter larger than the excavation diameter of the blade is cut into the hole wall surface of the excavation hole, and the co-rotation of the pin and the excavation axis of the pin involved in prevention of center deviation is gently suppressed through the boss. The conical part receives the excavation resistance at the time of excavation and tries to hold the excavation axis at the center position, and the round axis part excavates due to the resistance acting on the circular arc surface from the hole wall surface when the arm rotates (co-rotation) due to rotational flow energy The shaft is held at the center position, the wing cuts into the hole wall surface of the excavation hole to suppress the rotation direction, and the inclined surface on the lower surface reduces excavation resistance during excavation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment. As shown in FIGS. 1 and 2, a center deviation prevention device B (hereinafter simply referred to as a center deviation prevention device B) in a ground excavator is an excavation shaft 1. A predetermined number of arms 3 are extended over a boss 2 rotatably fitted to the required position in the up-down direction and the excavating wings 4 disposed on the shaft head of the excavating shaft 1 with respect to the arms 3. In a center displacement prevention device A (shown in FIG. 8) in which a pin 5 having a required diameter and having an axis at the same diameter position as the excavation diameter (1020 mm) is vertically provided, one of a pair of arms 3 At an angle (30 degrees) larger than the excavation diameter (1320mm)
The wing plate 6 having the outer end is integrally formed symmetrically with respect to the axis of the excavating shaft 1.

[0009] The center deviation preventing device B constructed as described above.
Is mounted on the excavating shaft 1 shown in FIG. 3, and when a pile is constructed by kneading excavated soil and solidified material, a loose spiral wear mark is recognized on the pin 5, as shown in FIG. As described above, it is supposed that the center deviation prevention device B rotates very slowly around the underground movement of the center deviation prevention device A shown in FIG. 9, and it is apparent that the stirring ability is improved. It is.

The center deviation preventing device B 'shown in FIGS. 5 and 6 has a vane plate 7 having an outer end having a diameter larger than the excavation diameter on the upper portion of the pin 5 at a required angle with respect to the arm 3. , And the resistance in the vertical direction in the excavation hole is reduced.

A pin 8 used in the center deviation preventing device shown in FIG. 7 has a round shaft portion 9 having a required diameter (same diameter as the outer diameter of the pin 5) and a required length, and an integral part below the round shaft portion 9. The conical portion 10 has a required cross section (the side surface is a tapered inclined surface 11 toward the outer end) and an upward slope outward from the peripheral surface of the round shaft portion 9 toward the outer end. And a wing portion 13 integral with a required length and having an inclined surface 12 of the same length as the excavation diameter of the digging wing 4 with respect to the arm 3. 13 is secured at a required angle in its posture and joined together for use. Therefore, when an obstacle interferes with the wing portion 13 during excavation, the obstacle is pushed away by the inclined surface 12 on the lower surface, and when trying to rotate around the side surface of the wing portion 13, the center direction is reduced. However, since the blade 13 is disposed symmetrically with respect to the axis of the excavation shaft 1, the excavation shaft 1 is held centripetally.

[0012]

According to the present invention, the co-rotation with the excavation axis is extremely slowly suppressed without impairing the center deviation prevention function, and the stirring ability of the mixture of excavated soil and the solidified material is improved. It has the effect of building a more precise quality improvement as a final product.

[Brief description of the drawings]

FIG. 1 is a front view of a center deviation prevention device B according to the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a front view showing an example of a digging shaft equipped with a center deviation prevention device B.

FIG. 4 is an illustration of an underground motion of the center deviation prevention device B;

FIG. 5 is a plan view of a center deviation prevention device B ′.

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a perspective view of a pin 8 used in the center deviation prevention device.

FIG. 8 is a plan view of the center deviation prevention device A.

FIG. 9 is an illustration of an underground motion of the center deviation prevention device A;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavation axis 2 Boss 3 Arm 4 Excavation wing 5 Pin 6 Wing plate 7 Wing plate 8 Pin 9 Round shaft part 10 Conical part 11 Inclined surface 12 Inclined surface 13 Wing part A Center deviation prevention device B Center deviation prevention device B 'Center deviation Prevention device

Claims (3)

(57) [Claims] 1. An excavator in which a required number of arms are extended evenly to a boss which is rotatably fitted on a boss which is vertically positioned at a required position of a digging shaft, and which is disposed at a shaft head of the digging shaft with respect to the arm. In a center deviation prevention device in which a pin of a required diameter having an axial center is vertically provided at the same diameter position as a digging diameter of a wing, a wing plate having an outer end having a diameter larger than the digging diameter at a required angle with an arm at the boss The center deviation preventing device in a ground excavator, which is integrally formed symmetrically with respect to the axis of the excavation shaft. 2. An excavator in which a required number of arms are extended to a boss which is rotatably fitted to a required position of the excavating shaft in the up-down direction and which is vertically disposed at a required position of the excavating shaft, and which is disposed at the shaft head of the excavating shaft with respect to the arm. In a center deviation prevention device in which a pin of a required diameter having an axis at the same diameter position as the excavation diameter of a wing is vertically provided, an excavation is provided above a pin disposed symmetrically with respect to the axis of the excavation axis. A center deviation preventing device for a ground excavator, wherein a blade plate having an outer end having a diameter larger than the diameter is integrally extended at a required angle with respect to an arm. 3. A round shaft portion having a required diameter and a required length, a conical portion below the round shaft portion, and an upper portion extending outward from a peripheral surface of the round shaft portion, and at least a lower surface in a required cross section. A pin for use in a center deviation prevention device having an inclined surface having an upward slope toward an outer end and comprising an integral wing portion having a required length.