JPH08319617A - Method and equipment for improvement construction of foundation ground - Google Patents

Abstract

PURPOSE: To make a pile pit extremely easily scarcely lifting excavated soil and sand in the ground onto the ground. CONSTITUTION: An auger casing 3, in which screw projecting strips 4 are annexed on the whole upper-lower peripheral surfaces, is continuously connected integrally to the upper section of an auger head 1 having head excavating blades 2 at a front end section while beltlike rotary rings 6 are fitted movably on the peripheral surface of the auger casing 3 in a freely slipping manner. A mortar feed-infect pipe 10 is penetrated to the axial center section of the auger casing 3, and the mortar feed-infect pipe 10 is communicated and formed to a mortar jet 9 opened at the front end of the auger head. When a pile pit is excavated into the ground by using an improving device for such a foundation ground, the beltlike rotary rings 6 movably fitted between the projecting strips 4 are slipped because the beltlike rotary rings 6 are pressed strongly by the earth-pressure resistance of cut-open soil in the cut-open soil to be lifted on the ground. The rotary rings 6 prevent the lifting of soil to be lifted, and soil stays and accumulates near the beltlike rotary rings 6, thus firmly consolidating soil on a pit peripheral wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement method for construction and the like, which is a pile having a strong hole wall that does not cause collapse in the ground and does not almost discharge the earth and sand into the ground. The present invention relates to a method for improving a foundation ground and an apparatus therefor for constructing holes very easily and surely.

[0002]

2. Description of the Related Art Conventionally, in a basic ground improvement method for digging a basic ground such as a building, a so-called screw method is generally known in which a screw strip is attached to the peripheral portion of an auger shaft. Since the soil on the peripheral wall of the hole is excavated and excavated with a screw blade piece having a diameter larger than the auger shaft, the excavated soil is excavated on the ground and a considerable amount of labor and time is required for earth removal work, etc. was there. As a solution to the above-mentioned drawbacks, the present inventor first provided a compressed soil edge at the peripheral edge portion of the screw blade piece and cut the hole peripheral wall by the action of the conical auger head, and at the same time, the soil to be excavated on the hole peripheral wall. The method (patent No. 1316177) for consolidating and forming a strong consolidating wall was developed and was well received, but by strengthening the peripheral wall of the consolidating hole, the frictional force with the hole periphery becomes large and the rotation of the auger rotates. It turned out that there was a hindrance to the approach.

[0003]

SUMMARY OF THE INVENTION In view of the above problems, the present invention utilizes the discharged earth and sand in the reverse direction without replacing the soil in the drill hole to the ground, and alternately replaces it with the peripheral wall of the drill hole. It is intended to extremely easily and surely form a strong pile hole on the peripheral wall of the hole by measuring the complete solidification of the peripheral wall of the hole and without fear of collapsing over the entire length of the hole. Its main purpose is to provide an improved construction method for a foundation ground and a device for the construction, which can be easily and surely constructed without any noise in any ground layer.

[0004]

As a means for achieving the above object, a drilling device according to the present invention has an auger head having a tip drilling blade 2 at its tip as shown in the drawings. 1, an auger casing 3 having screw projections 4 attached to the entire upper and lower circumferential surfaces is integrally or detachably connected, and annular grooves 5 having a constant width are provided on the circumferential surface of the auger casing 3 at regular intervals. Using a specially shaped drilling device in which a plurality of grooves are recessed in each of the annular grooves 5 and the belt-shaped rotary ring 6 is loosely fitted in each annular groove 5, a predetermined ground is rotationally drilled and a pile hole A is drilled in the ground. To do. At the same time as the ground excavation by the auger is attempted to excavate the excavated soil a in the ground by the action of the screw ridges 4, the belt-shaped rotary ring 6 loosely fitted to the auger casing 3 surface provides a strong force around the hole. Due to earth pressure resistance, it spins in the annular groove 5, and the rising earth and sand gradually stagnates and solidifies on the outer circumference of the belt-shaped ring 6. Then, around the band-shaped rotary ring 6, the soil a which is a solid body is continuously connected by the screw protrusions 4 of the auger casing 3 and the soil that can be solidified is cut again at the same time as the soil is lifted and the band-shaped rotary ring is continued. On the 6th surface, soil to be pumped up is solidified again as above. According to the present invention, the soil a that can be solidified on the peripheral surface of the auger casing 3 is incised by the action of the screw protrusions 4 and solidified by the belt-shaped rotary ring 6 as described above. By the action of continuously repeating the setting-dissection-consolidation-dissection, the soil for incision of the perimeter wall is not used to be excavated to the ground, and the soil to be excavated is used for the perimeter wall. This is a method of consolidating and constructing stronger pile holes.

Further, as the above-mentioned construction apparatus, an auger casing 3 having a screw projection 4 provided on the entire upper and lower peripheral surfaces on an auger head 1 having a tip digging blade 2 at the tip thereof.
Are integrally connected to each other via a belt-shaped pedestal 7, and annular grooves 5 having a constant width are formed in the peripheral surface of the auger casing 3 at regular intervals and each annular groove 5 is formed. In addition, the belt-shaped rotary ring 6 is loosely fitted in the ring-shaped rotary ring 6 so as to freely rotate or idle.

Further, in place of the screw protrusions 4, several protrusions 4a having a constant length are provided on the peripheral surface of the auger casing 3 in the vertical direction at regular intervals on the pillar surface in a column shape. Alternatively, it is attached obliquely and a band-shaped rotary ring is loosely fitted between the upper and lower protrusions 4a.

Further, the annular groove 5 of the auger casing 3 is used.
By integrally attaching and forming the auxiliary steel pipe 8 as a backing plate to the inner surface of the portion, the annular groove 5 portion becomes strong and the belt-shaped rotary ring 6 rotates more smoothly and easily.

[0008]

Next, the construction example of the device will be explained. First, the device is set on a pile driver and set on a predetermined ground, and thereafter, when the power is driven, the cutting blade 2 at the tip of the auger head 1 rotates. Then, the ground is advanced while disturbing the ground, but at the same time as the excavation, the screw ridges 4 attached to the auger casing 3 spread the excavated soil upward and to the periphery to excavate the ground to a predetermined depth. A part of the soil around the hole pushed up by the screw excavation along with the above-mentioned excavation spreads to the circumference of the hole and is discharged, but the excavated soil a strongly presses the casing 3 surface due to earth pressure resistance, etc. Try to reduce. However, the earth pressure resistance is applied to the belt-shaped rotary ring 6 that is loosely supported in each annular groove 5 of the auger casing 3, and the rotation thereof is blocked, so that the belt-shaped rotary ring 6 idles. Further, as the auger casing 3 continues to descend, the action of the screw ridges 4 attached to the surface of the auger casing 3 cuts off the soil a that can be cumulatively solidified in the vicinity of the surface of the belt-shaped rotary ring 6 and the auger casing 3
The soil a on the peripheral wall of the hole to be excavated by the excavation is again accumulated and solidified in the vicinity of the upper belt-shaped rotary ring 6 in the same manner as above. By the action of continuously repeating consolidation, incision, consolidation, and incision of the soil a, the incision soil of the hole peripheral wall is not lifted to the ground, but on the other hand, the soil excavated soil is used to firmly bond to the hole peripheral wall. A pile hole having a hole peripheral wall for compaction can be easily and surely constructed.

Thus, when the above-mentioned digging reaches the destination layer, the mortar injection hole 9 opened at the tip of the head through the mortar injection pipe 10 which is preliminarily provided in the shaft of the auger casing 3 from above the ground mortar into the underground mortar. While spraying and filling with a condensing material such as, the whole equipment is pulled out to the ground to form a mortar pillar D in the ground, and then an existing pile P such as a concrete pile is inserted into the excavated pile hole and placed. Therefore, it is possible to easily and surely request the construction and construction of the foundation ground having a strong consolidation layer in the ground.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ground drilling device used in the present invention will be described below. 1 is an auger head 1 having an elongated conical shape on the entire outer peripheral surface thereof, a tip drilling blade 2 at the tip, and the peripheral surface. A screw blade piece having an appropriate diameter width is integrally provided in the. The auger casing 3 is integrally or detachably connected to the upper part of the auger head 1 via a pedestal 7 having a diameter larger than the head 1 or a diameter larger than that of the auger head 1. Along with the provision of the strips 4, annular grooves 5 of constant width are formed at appropriate places on the peripheral surface, and several grooves are formed at regular intervals, and the belt-like rotary ring 6 is rotatably fitted in each annular groove 5. Also, the annular groove 5 is configured so that the rotation of the auger casing 3 is stopped irrespective of the rotation of the auger casing 3 by a load such as earth pressure resistance from the outside.

Further, in place of the screw ridges 4 described above, FIG.
As described above, a plurality of projections 4a having a constant length are attached to the peripheral portion of the auger casing 3 in the vertical direction at regular intervals on the pillar surface in a column shape or an oblique shape, and the vertical projections are formed. 4a ...
It is also considered that the belt-shaped rotary ring 6 can be freely idled in between.

The belt-shaped rotary ring 6 may be formed by recessing a part of the auger casing 3 in an annular groove and loosely fitting it in the recessed groove, but as shown in FIG. An auxiliary steel pipe 8 is integrally welded as a backing plate to the back surface of the position of the annular groove 5 on the inner surface to form a belt-shaped rotary ring 6 in the recessed groove.
It is also possible to fit the wheel so that it can rotate freely. Reference numeral 9 is a mortar injection hole that is opened at the tip of the auger head 1, and 10 is a mortar injection pipe that is inserted through the axial center of the auger casing 3 and that is in communication with the mortar injection hole 9. Further, a hard grill is provided in the concave groove of the annular groove 5,
It goes without saying that a smoother and better rotation action can be obtained by filling with a lubricant such as oil.

[0013]

As described above, in the ground drilling device according to the present invention, the annular groove 5 is provided in the peripheral surface of the auger casing 3 at regular intervals, and the belt-shaped rotary ring 6 is inserted into the annular groove 5. Since it is fitted, the annular groove 5 does not depend on the rotation of the auger casing 3 due to the strong earth pressure resistance around the hole.
The belt-shaped rotary ring 6 spins inside. That is, when the rotation of the belt-shaped rotary ring 6 is stopped, the cut-off earth and sand of the hole peripheral wall generated at the time of digging gradually stagnates on the belt-shaped ring surface and its vicinity, and finally solidifies. However, the soil to be solidified is again incised again by the screw ridges 4 attached to the auger casing 3 which continues following the excavation in the ground, but the soil to be excavated and excavated by the next strip-shaped rotary ring 6 is removed. Resolidify again while solidifying,
It is possible to construct a strong pile hole in the ground easily and surely by the repeated action of incision. Moreover,
By simply increasing or decreasing the number of the belt-shaped rotary rings 6 to be attached to the excavated ground, any soil type can be quickly adapted to the soil type, and there is almost no rotational load on the auger casing. There is no concern about the collapse of the peripheral wall of the auger hole, which was a problem at all, and it is possible to easily and surely dig a pile hole with a strong consolidation wall in the ground by using the soil removed. It also has an effect.

[Brief description of drawings]

FIG. 1 is a front view of a ground drilling device according to the present invention,

FIG. 2 is a front view of a ground drilling device according to another embodiment,

FIG. 3 is an enlarged cross-sectional view of a main part,

FIG. 4 is a construction view of a pile hole. DESCRIPTION OF SYMBOLS 1 Auger head 2 Cutting edge 3 Auger casing 4 Screw ridge 4a Ridge 5 Annular groove 6 Belt-shaped rotary ring 7 Pedestal 8 Auxiliary steel pipe 9 Mortar injection hole 10 Mortar injection pipe

Claims (4)

[Claims] 1. An auger casing having screw ridges attached to the entire upper and lower peripheral surfaces is integrally connected to the upper portion of an auger head having a tip cutting blade at its tip, and the auger casing is fixed above and below the auger casing. A predetermined ground is rotationally drilled using a drilling device which is provided with a plurality of projections spaced apart from each other and in which a strip-shaped rotary ring of a certain width is freely idled in the space between the upper and lower projections. When digging a pile hole in the ground, the excavated soil on the peripheral wall of the hole is excavated on the ground while being cut by the action of the protrusions attached to the auger casing surface that follows the auger head at the same time as the ground excavation by the cutting edge blade is advanced. However, the strip-shaped rotary ring, which is loosely fitted between the upper and lower protrusions, strongly presses the strip-shaped rotary ring by the earth pressure resistance of the incised soil and spins the soil, which raises the soil. Block and finally accumulate stagnant near the zonal annulus. This is firmly solidified. The excavated soil around the hole in the solidified body is re-incised by the ridges on the casing surface that follow as the auger casing descends. Dig in. However, as the auger casing descends, the excavated soil on the peripheral wall of the hole is solidified again at the next adjacent strip-shaped rotary ring surface as described above. Simultaneously with such excavation of the auger casing, soil that solidifies in the vicinity of the belt-shaped rotary ring is attached to the surface of the auger casing. An improved method of foundation ground, characterized by constructing strong pile holes in the ground with almost no excavation of cutting soil to the ground. 2. An auger casing having screw-shaped projections attached to the entire upper and lower peripheral surfaces is integrally connected to an upper portion of an auger head having a tip digging blade at its tip end through a pedestal, In addition, a plurality of annular grooves having a constant width are formed on the peripheral surface of the auger casing at regular intervals in the vertical direction, and a belt-shaped rotary ring is freely idled in each annular groove. An apparatus for improving a foundation ground, wherein a mortar injection pipe is provided through an axial center portion of an auger casing, and the mortar injection pipe is connected and communicated with a mortar injection hole which is opened at a tip of an auger head. 3. The foundation ground improving device according to claim 2, wherein a plurality of ridges having a constant length are provided on an upper portion of an auger head having a tip digging blade at its tip. And auger casings, which are vertically or obliquely attached to the pillar surface at regular intervals in a vertical direction, are integrally connected to each other, and a belt-shaped rotary ring is loosely fitted between the upper and lower protrusions. A device for improving the foundation ground, which is characterized by the fact that 4. The foundation ground improving device according to claim 2, wherein a plurality of annular grooves each having a constant width are vertically provided at upper and lower portions of an auger head having a tip cutting edge. The base ground is characterized in that the auxiliary steel pipe is integrally fixed as a backing plate to the back surface portion of the annular groove and the strip-shaped rotary ring is rotatably loosely fitted in the annular groove. Improved device.