JP2894673B2 - Multi-axis expanding drill method and its device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiaxial diameter drilling method for drilling a vertical hole when constructing various vertical piles, foundation piles, landslide prevention piles and the like underground, and an apparatus therefor.

[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 is not suitable for hard ground or crushed stone layers.

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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-axis diameter drilling method and an apparatus for solving the above-mentioned problems and achieving safe and efficient unmanned operation.

[0009]

According to the present invention, at least two small-diameter all-hole advanced casings for an advanced hole drilling method for drilling a vertical hole to construct a pile in the ground are provided. An excavator and an all-casing excavator for advanced holes are installed on the ground with a row of small-diameter all-casing excavators for reverse holes with widening wings in the middle of the excavator. The drilling work is performed by following the all-hole casing for the reverse hole in which the widening wing is widened, and after the advanced hole drilled by the all-casing excavator for the advanced hole reaches a predetermined depth, the drilling wing is pulled up, and the reverse hole is drilled. The excavation wing and the widening wing of the all-casing excavator are used to excavate the remaining portion of the advanced hole and connect it to the advanced hole.

According to the present invention, there is provided a multi-axis large-diameter drilling machine for drilling a vertical hole for constructing a pile underground. A casing with a small-diameter reverse casing all-casing excavator with a widened wing provided between those advanced casing all-casing excavators, and a first tube fixed to the end of the rotating and pushing device of those excavators. A plurality of first bits are implanted at the bottom of the first tube, and a plurality of excavation wings having a plurality of wing bits are provided near a boundary between the casing and the tube, and a connection between the first tube and the excavation wing is provided. The part is formed with a plurality of sediment intakes, and the excavation wing of the all-casing excavator for reverse holes is radially outward. Hydraulic jacking widening is provided with a contraction, the widening wings are attached to the outer end of the widening hydraulic jacking.

[0011]

According to the present invention, large-diameter construction can be performed by simultaneously constructing a plurality of small-diameter excavators. In addition, simultaneous construction of the advanced hole and the reverse hole improves the excavation efficiency and greatly shortens the construction cycle.

In addition, since a small-diameter excavator is used as a base, the construction machine can be made compact, and there is an advantage that construction can be performed without any problem even in a mountainous area or a hill area.

[0013]

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

In FIG. 1, a plurality of (two in the illustrated example) small-diameter all-casing excavating machines 10 and 10
And the widening wing 22 between the excavators 10 and 10
Diameter all-casing excavator 20 for reverse drive
Are arranged in a row.

A casing 12 is supported on a rotating / pushing device 11 of the excavator 10. At the end of the casing 12, a first tube 13 is fixedly provided.
A plurality of first bits 14 are implanted at the bottom of the first tube 13. Also, the casing 1
A plurality of (one pair in the illustrated example) excavation wings 15 are provided near the boundary between the second tube 13 and the first tube 13. The lower edge of the excavation wing 15 is formed in a cone shape whose diameter is reduced downward, and a plurality of wing bits 16 are planted on the lower edge. A plurality of sediment inlets 17 are formed at the connection between the first tube 13 and the excavation wing.

In FIG. 2, the upper edges of the excavating wings 21, 21 of the all-casing excavator 20 for a reverse hole are respectively provided with hydraulic jacks 24 for widening which expand and contract radially outward.
Is provided. The widening wing 22 is connected to the outer end of the jack 24, and the wing bit 23 planted at the lower edge of the jack 24 is connected to the wing bit 16 at the time of widening.
It is located on the same straight line as. The rest is configured similarly to the excavator 10.

A hydraulic chamber (not shown) of the hydraulic jack 24 is provided with a switching valve 25 by hydraulic circuits L1 and L2, respectively.
Is selectively connected to the first accumulator 26 or the second accumulator 27. The switching valve 25 is selectively connected in parallel or cross by hydraulic pressures of both accumulators 26 and 27 via electromagnetic valves 28 by hydraulic circuits L3 and L4. Therefore, in the illustrated state, the jack 24
Are extended, and the widening wing 23 is widened.

Next, the mode of construction will be described.

During excavation, the excavators 10 and 10 are operated to cut the advanced holes A and A, and the widening wings 22 and 22 of the excavator 20 are operated to widen the reverse holes B (FIG. 5). Make holes (Fig. 3). When the advanced holes A reach a predetermined depth, the excavation wings 15 are raised.
In addition, the code | symbol A1 in a figure is the last excavation surface (FIG. 4).

Therefore, the excavating wing 21 of the excavator 20
The excavation remaining portion C formed by the advanced holes A, A is widened and excavated by the widening wings 22 and 22 to the portion indicated by the arrow by using the widening wings 21 and 22, and an excavated cross section D indicated by a hatched portion in FIG. 5 is formed. When widening wings are attached to all the excavators 10 and 20, a portion indicated by D 'in FIG. 5 is excavated.

In the above excavation, the excavated earth and sand is taken into the first tube 13 from the earth and sand inlet 17 and discharged to the ground by the club hammer 2, the bucket 3 (FIG. 1) and the like.

In order to cure the hole wall of the excavation hole, a scaffold is constructed by using the casing 12 and the excavation wings 15 and 21, and is constructed by spraying or reverse-winding concrete.

FIG. 6 shows an excavation pattern E3 obtained by widening three excavators 20 each having a widening wing 22 and two-shift excavation, and a securable area F indicated by a hatched portion.
1 is an example.

FIG. 7 shows an excavation pattern E2 and an area F obtained by similarly shifting two units by two and three units by one.
2 is an example.

FIG. 8 shows an example of an excavation pattern E3 and an area F3 obtained by similarly shifting three units three times.

[0026]

As described above, according to the present invention, the following effects can be obtained. (1) Safe and efficient unmanned operation can be achieved. (2) Large-diameter excavation can be performed by a small-diameter all-casing excavator. (3) Accordingly, construction can be performed even in mountains and hills where large machines cannot be used.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the apparatus of the present invention.

FIG. 2 is a front sectional view showing the area around the widening wing in FIG. 1;

FIG. 3 is a front sectional view showing a state of the excavation mode of the present invention when the advanced hole is stopped.

FIG. 4 is a front sectional view showing a state at the start of final excavation.

FIG. 5 is a plan view showing the obtained excavation cross section.

FIG. 6 is a plan view showing an example of an excavation pattern and a securable area.

FIG. 7 is a plan view showing another example of an excavation pattern and a securable area.

FIG. 8 is a plan view showing another example of an excavation pattern and a securable area.

[Explanation of symbols]

 A: Advanced hole B: Reverse hole C: Excavation remaining part D: Excavation cross section E1-E3: Excavation pattern F1-F3: Area that can be secured 1: Stand 2.・ ・ Club hammer 3 ・ ・ ・ Bucket 10 ・ ・ ・ All-casing excavator for advanced holes 11 ・ ・ ・ Rotating / pressing device 12 ・ ・ ・ Casing 13 ・ ・ ・ First tube 14 ・ ・ ・ First bit 15, 21 ・ ・ ・Excavation wing 16 ・ ・ ・ Wing bit 17 ・ ・ ・ Sand intake 20 ・ ・ ・ All casing excavator for reverse hole 22 ・ ・ ・ Wings widening 23 ・ ・ ・ Wing bit 24 ・ ・ ・ Hydraulic jack for widening 25 ・ ・ ・Switching valve 26 ... First accumulator 27 ... Second accumulator 28 ... Electromagnetic valve

Continuation of the front page (72) Inventor Yasuo Higuchi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) References JP-A-4-62291 (JP, A) Jikken Sho 56-29405 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21B 7/00 E02F 5/02 E21D 1/06

Claims (2)

(57) [Claims] 1. A multi-axis drilling method for drilling a vertical hole to construct a pile in the ground, wherein at least two small-diameter all-hole casings for an advanced hole are excavated and all-casing drilling for those advanced holes is performed. All-casing excavator for small-diameter reverse holes with widening wings in the middle of the drilling machine A row of excavators arranged in a row is installed on the ground, and all-casing excavators for advanced holes are used ahead of the widening wings. The drilling work is performed after the all casing is drilled, and after the advanced hole drilled by the all casing excavator for advanced hole reaches a predetermined depth, the excavation wing is raised, and the excavation wing and the widening wing of the all casing excavator for reverse hole are drilled. A multi-axis diameter drilling method characterized by drilling the remainder of the advanced hole and connecting it with the advanced hole. 2. A multi-axis large-diameter drilling machine for drilling a vertical hole in order to construct a pile in the ground, wherein a small-diameter advanced casing all-casing excavator is provided on both sides of a stand installed on the ground. A small-diameter all-casing excavator with a wide-width wing is provided between all-casing excavators for advanced holes, and a rotating / push-in device for those excavators is provided with a casing with a first tube fixed at the end. A plurality of first bits are planted at the bottom of the first tube, a plurality of digging wings having a plurality of wing bits are provided near a boundary between the casing and the tube, and a plurality of digging wings are provided at a connecting portion between the first tube and the digging wing. The widening oil that expands and contracts radially outward is formed on the excavation wing of the all-casing excavator for the reverse hole. A multiaxial diameter drilling device, comprising a pressure jack, and a widening wing attached to an outer end of the widening hydraulic jack.