JP2894674B2 - Diameter expanding reaming up method and its device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention aims to provide a reaming-up method for drilling a vertical hole when constructing various vertical piles, foundation piles, landslide prevention piles and the like in the ground, and an apparatus therefor. I have.

[0002]

2. Description of the Related Art Conventionally, when drilling a vertical hole in the ground, basically, a circular hole having the same diameter is formed on both the upper and lower sides. However, in cast-in-place concrete piles, in order to reduce the amount of excavated soil and concrete, expanded bottom piles that expand the bottom and increase the bearing capacity of piles are used particularly in construction work. Most are the drilling method or earth drilling method.

[0003] The reverse circulation method,
Shears excavated by the wing bit are discharged together with water through a drill pipe by a pump for muddy water or an air lift.

[0004] In the earth drill method, the rotating force of a rotating device on the ground is transmitted to a bucket by an expanding and contracting kelly bar device to take in earth and sand, and the kelly bar is contracted and discharged to the ground.

[0005]

The conventional reverse circulation method requires a muddy water treatment facility for treating water and the waste discharged together with the water, and also requires a hard ground, a boulder layer, and a gravel layer. Is not suitable.

On the other hand, in the earth drill method, since drilling and earth and sand discharging work are alternated, the deeper the work, the worse the work efficiency. In addition, since the entire cross section is excavated by the bucket, a harder ground requires a larger rotation torque and pushing force. However, it is not suitable for deep and hard ground due to the strength of Keliva.

[0007] Therefore, for deep and hard ground, a deep foundation method by manual excavation has conventionally been adopted. However, there was a problem that it was dangerous and excavation efficiency was poor. It is an object of the present invention to provide a reaming-up method and an apparatus therefor that solve the above-mentioned problems and achieve safe and efficient unmanned operation.

[0008]

According to the present invention, in a reaming-up method for drilling a vertical hole when constructing a pile in the ground, an upper end is horizontal at a lower end and a lower edge is inclined. The casing provided with the widening wing and the drag bit is rotated forward and pushed by a rotary pushing device to drill a Glory hole to a predetermined depth, and then the casing is reversed and moved up and down to widen the widening wing, and the casing is removed. The Glory hole is excavated and expanded by the reaming-up bit of the widening wing, and the excavated earth and sand is discharged.

Further, according to the present invention, in a reaming-up device for drilling a vertical hole when constructing a pile in the ground, a casing in which a first tube having a plurality of drag bits planted at a lower end thereof is connected, and the casing is connected to the casing. A rotating push-in device for gripping, rotating forward, pushing in, rotating in reverse, and pulling up.The outer periphery of the first tube has a widening wing that presses against the outer periphery of the first tube when the casing rotates forward and expands when the casing reversely rotates. The upper edge of the widening wing is formed horizontally, and a plurality of reaming up bits are implanted.The lower edge of the widening wing is inclined to the first tube side at an angle close to the angle of repose of the earth and sand. A plurality of widening bits are implanted.

[0010]

In the present invention, since the widening reaming is performed, the strong casing pulling force of the all-casing excavator can be utilized, high-efficiency excavation is possible, and a Glory hole is formed by casing drilling. Therefore, the above-described excavation effect utilizing the pulling force is large.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a rotary extruder 2 is provided on a gantry 1 provided on the ground of a casing excavator, and a casing 3 is gripped by the device 2.
A first tube 4 is connected to a lower portion of the casing 3, and a plurality of drag bits 5 are implanted at a lower end of the first tube 4. Reference numerals 10 and 11 in the drawing denote a club hammer and a bucket as a discharging means.

Referring to FIGS. 4 and 5, a plurality of (four in the illustrated example) widened wings 6 are pivotally connected to the outer periphery of the first tube 4 by hinge portions 7. The widening wing 6 is formed in an arc shape so that when the first tube 4 rotates forward in the direction of arrow a, it follows the inner periphery of the glory hole A and is pressed against the outer periphery of the first tube 4.

The upper edge of the widening wing 6 is formed horizontally, and a plurality of reaming-up bits 8 are implanted on the upper edge. The lower edge of the widening wing 6 is inclined toward the first tube 4 at an angle close to the angle of repose of the earth and sand, and the lower edge thereof has a plurality of widening bits 9.
Has been planted.

Referring also to FIGS. 6 and 7, the widening wing 6 pivotally attached to the first tube 4 causes the centrifugal force and the edge 6a when the first tube 4 is reversed in the direction of arrow b.
Glory hole A is excavated into a large-diameter hole C having a diameter B so as to be finished.

Next, the mode of excavation will be described with reference to FIGS.

(1) Casing Drilling Step (FIG. 1) The casing 3 is rotated forward and pushed by the rotary pushing device 2, and the drag bit 5 drills the Glory hole A to a predetermined depth.

(2) Widening Step (FIG. 3) The casing 3 is rotated in the reverse direction and slightly moved up and down to widen the widening wing 4 as shown in FIG.

(3) Reaming Up Step (FIG. 3) The casing 3 is reversed and pulled up, and the ground is excavated by the reaming up bit 8 and the widening bit 9, and the Glory hole A is expanded to the large diameter hole C. Then, the excavated earth and sand D is discharged to the ground by the club hammer 10 and the bucket 11, but cannot cover all the widened area. However, because of the widening bit 9 disposed close to the angle of repose of the earth and sand, the earth and sand falls into the outer diameter of the central casing 3, that is, into the Glory hole A, so that the earth is easily discharged. Then, the large-diameter hole C is cured by spraying or reverse-winding concrete.

FIGS. 8 to 10 illustrate the present invention at the bottom of a tunnel H
This is an example in which a hole is drilled in a ventilation shaft or the like.

First, a casing drilling step is performed as shown in FIG. 8, and the Glory Hole A is penetrated to the tunnel H. Then, as shown in FIG. .

The earth removal operation is performed in a casing drilling process as shown in FIG.
As shown in (1), the soil is discharged to the ground by the club hammer 10 or the bucket 11, but at the time of the reaming-up step, a hopper P and a conveyor V are installed in the tunnel H as shown in FIG.

[0023]

As described above, according to the present invention, the following effects can be obtained. (1) Excavation work and earth removal work can be performed simultaneously, and work efficiency can be improved. (2) Since the soil is discharged from the Glory Hall, there is no need to use water, and no water supply and muddy water separation equipment is required. Therefore, construction can be performed advantageously in a small space in terms of cost. (3) After drilling the GLORY hole, reaming is performed to finish the large-diameter hole, so that the drilling force can be smaller than that of full-section drilling, which is advantageous in terms of precision. (4) The construction machine is based on a conventional all-casing excavator and requires only the modification of the first tube, and no special equipment is required.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a casing excavation step.

FIG. 2 is a longitudinal sectional view illustrating a widening step.

FIG. 3 is a longitudinal sectional view illustrating a reaming-up step.

FIG. 4 is a top view of the first tube showing a non-widened state.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a top view of the first tube showing a widened state.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a view similar to FIG. 1, showing a case where a shaft is excavated for a tunnel.

FIG. 9 is a view showing a widening step in FIG. 8;

FIG. 10 is a diagram for explaining earth removal from the gallery of FIG. 8;

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Moriyuki Shimai 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yasuo Higuchi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Hidekazu Anai 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) References Real Opening Showa 49-69903 (JP, U) Field (Int.Cl. ⁶ , DB name) E21B 7/28 E21B 10/32

Claims (2)

(57) [Claims] In a reaming-up method for drilling a vertical hole when constructing a pile in the ground, a casing provided with a widened wing having a horizontal upper end and a slanted lower edge at a lower end and a drag bit. Is rotated forward by a rotary pushing device to push the Glory hole to a predetermined depth, then reversely move the casing up and down to widen the widening wing, and pull up while rotating the casing in reverse to ream the widening wing. A diameter expanding reaming-up method, wherein the Glory hole is excavated by an up bit and the excavated earth and sand is discharged. 2. A reaming-up apparatus for drilling a vertical hole when constructing a pile in the ground, comprising: a casing connected to a first tube having a plurality of drag bits planted at a lower end; A rotating push-in device that rotates, pushes in, reverses and pulls up, and a widening wing that pivots on the outer periphery of the first tube and presses against the outer periphery of the first tube when the casing rotates forward and widens when the casing reversely rotates, The upper edge of the widening wing is formed horizontally and a plurality of reaming up bits are planted, and the lower edge of the widening wing is inclined toward the first tube side at an angle close to the angle of repose of earth and sand to form a plurality of widening An expanding reaming device, wherein a bit is implanted.