JP3015868B2 - Drilling method and equipment for connecting holes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a continuous wall in ground improvement such as construction, in which a plurality of pile holes for connecting excavated earth and sand to the ground without discharging the ground almost to the ground are simultaneously formed. The present invention relates to a method and an apparatus for excavating a connecting hole, the main purpose of which is to excavate and easily and surely construct a continuous wall in which the peripheral wall of the connecting hole is firmly pressed.

[0002]

2. Description of the Related Art Conventionally, as a soil improvement method for a foundation ground such as a building, a predetermined number of pile holes are individually excavated in the ground, and a coagulant such as mortar is filled in the excavation holes. Means for forming a foundation pillar group by inserting a pile core during hardening is generally performed. In recent years, in addition to the above-mentioned single pile driving work, various so-called connecting pile construction methods for connecting a large number of single pile holes to construct a continuous wall of a fixed length have been developed. However, as described above, the drilling of a large number of single pile holes individually and continuously in the ground is not limited to the case where a stone block or the like is buried at the tip of each single pile as well as the hardness of the construction geological ground. However, it is impossible to drill pile holes in the vertical direction, which makes it extremely difficult to find uniform connection holes in the ground. However, there was a limit in terms of time. In view of these problems, in the industry, several years ago, a plurality of auger rods were integrally connected instead of the above-mentioned single pile driving, and this was hung on a multi-rod excavator to hang the plurality of auger rods. A number of drilling methods of connecting holes for drilling continuous pile holes in the ground by simultaneously rotating and drilling auger rods are being developed. However, since most of the auger rods used in the construction of these connecting holes are simply a structure in which a plurality of screw augers of a normal shape are combined in a row in a row, rocks, clay, etc., between each screw during operation. When foreign matter is caught, each auger cannot be rotated uniformly, and there is a concern that the wing pieces may be damaged, as well as poor orientation as in the case of the single pile construction. However, the soil had fallen and collapsed, and as a result, it was difficult to construct a secure pile hole.

[0003]

DISCLOSURE OF THE INVENTION In view of the above problems, the present invention is to maintain a reliable direction regardless of the strength and the like of a driving ground in a construction method of a connecting pile and to solve the conventional problems. It is intended to improve the mixing at the connection part of the pile hole, and also to excavate the connection hole where the pile wall peripheral wall is strongly pressed at the same time as the drilling of the pile hole, without using a normal screw auger. Each surface part of the auger surface is recessed slightly inward as a shape to form a curved surface.
And an appropriate diameter clamping rod at each vertex of the outer periphery.
As described above, a plurality of auger rods having a triangular cross section, which are integrally arranged , are connected in a row, and an intermediate auger rod is connected to an adjacent auger rod in a reverse rotation so as to form each auger rod as described above. A pressure that naturally removes foreign matter that has caught between the rods to the outside of the rods and simultaneously mixes the soil and coagulant mixed between the augers, and further applies the mixed earth and sand to be mixed to the outer periphery of the triangle of each auger. Of the tightening rod
Using the forward and reverse rotation action, the entire amount of the above-mentioned excavated soil is pressed against the perimeter of the hole without discharging it to the ground. It is an invention that has made it possible to reliably perform construction.

[0004]

As means for achieving the above-mentioned object, an auger head having an appropriately dug blade 5 at its tip as shown in FIG. An auger rod 1 having an overall shape formed in a triangular cross section is integrally connected to an upper portion of the upper part 4, and a plurality of the auger rods 1 are arranged in three rows or five rows in a row in the axial direction. The rotation trajectory a of the outer periphery of the auger rod 1 is at least partially overlapped with the rotation trajectory b of the auger rod 1 on the adjacent side. The arrangement is such that the auger rod 1b at the middle of the row is interlocked and connected via an interlocking mechanism so as to rotate in the reverse direction with respect to the rotation direction of the adjacent auger rods 1a and 1c on both sides. Further
The shape of the auger rod 1 is as shown in FIG.
The curved surface 9 is formed by slightly indenting the surface portion inwardly.
At the same time, a pressure rod 8 of appropriate diameter is attached to each vertex of the outer periphery.
Integrally arranged, the overall shape is formed in a triangular cross section
Auger rods are arranged in a row. According to the present invention, the excavator having the above-mentioned configuration is suspended from the multi-axis excavator A during construction, and the auger rods 1a, 1b, 1c which are interlockingly connected in parallel in driving the power are simultaneously rotated forward and reverse. Outside the triangular auger rods 1a, b, c by the forward and reverse simultaneous rotation
The excavated debris is removed by the action of the clamping rod 8 attached to the periphery.
To excavation underground while repeating clamping and drilling, and its characterized by occupying performed Juana a certain length of the interlocking holes E in the ground.

[0005]

Next, a description will be given of a construction example using the above-mentioned apparatus. First, a plurality of auger rods 1 having a general shape formed in a triangular cross section are formed in accordance with a continuous wall to be constructed.
For example, an excavator having a structure in which three auger rods 1a, b, and c are supported in a row in the axial direction is suspended from a multi-axial excavator A, and the auger rods are interlocked and connected to each other in driving power. 1a, b, and c excavate a predetermined ground while performing forward and reverse simultaneous rotation. However, the rotation of the auger rod 1 is opposite to the rotation direction of the auger rods 1a and 1c on both sides where the auger rod 1b on the intermediate side is adjacent. Therefore, as shown in FIG. Pressure applied to each triangle vertex
Clamping rod 8 dissected hole circumference soil alternating with A → b → c,
At the same time, a space in which the excavated earth and sand forms a recessed surface of the adjacent auger rod 1b with the rotation of the auger (polymerization X
1) The mixed excavated debris is sequentially drilled by the reverse rotation of the auger rod 1b on the adjacent side and the rotation of the a → a → c by the pressing rod 8 to mix the mixed earth and sand. A strong hole peripheral wall is formed by pressing the peripheral wall. Further, the surrounding soil is excavated by the rotation action of each of the above-mentioned compression rods 8a → a → c by auger excavation, and at the same time, the auger rod 1c in the triangular plane of the auger rod 1c reversely rotating the excavated soil on the next adjacent side, ie, the auger rod 1 Concave
The excavated debris is conveyed into the space (polymerization X1) → (X2) where the entry surface can be formed , and is again pressed against the peripheral wall of the hole by the rotation of the pressing rods 8 → A → U to connect with the peripheral wall of the hole. It may be possible to create a strongly pressed continuous wall in the ground. In particular, in the present invention, the overall shape of each auger rod 1 is
Formed in a triangular shape and arranged on each auger rod 1a-c
The clamping rod 8 is configured to perform forward and reverse simultaneous rotation.
At the same time before and after the excavation work
Excavation and compression are performed, and each auger rod is formed on one surface
It is necessary to mix well the earth and sand in the peripheral portion that can be excavated in the concave curved surface 9 and press the mixed earth and sand against the peripheral wall surface of the hole to reliably and easily form a solid consolidation connection hole in the ground. I can do it.

[0006] As described above, the solid connection hole B is continuously drilled deeply into the ground while continuously repeating the operations of excavating, pressing, cutting, and further pressing with the auger alternately and continuously. Thereafter, the entire apparatus is pulled up from the connecting hole B to be drilled, and a condensing material such as mortar is filled in the connecting hole B, and a steel core material is inserted before hardening, or an existing pile such as a concrete pile is removed. By laying as a core pile, it is possible to reliably and easily build and construct a continuous wall with strong mortar connection layers P to P in the ground. Further, by injecting a condensing material such as mortar into the excavation hole from the mortar injection hole 6 at the tip of the apparatus at the time of the excavation, as described in the above section, the mortar injected with the auger excavation and the excavated earth and sand are excellent. This can solve the problem of mixing, which has been a concern in the past, and weakening of the mixing at the joint between the pile holes.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings. The auger rod 1 is formed in a triangular cross section with the support shaft 2 as a center axis. A plurality of the auger rods 1 are detachably and integrally connected to the upper part of the auger head 4 having the cutting edge 5 and
3 rows or 5 rows in a row with respect to the axial direction
The auger rod 1 in which the rotation trajectories a, b and c of a and c are adjacent to each other
Are supported in parallel by upper and lower supports 3 (shake supports) so as to overlap with the rotation trajectory of X. In addition, as shown in FIG. 4, each support shaft 2-2 is arranged in parallel on a straight line BB and one of the triangular apex points CC is arranged in parallel on the straight line BB as shown in FIG. At each ogre rod 1
The rotation trajectories a, b, and c of a, b, and c dig into each other to automatically determine the interval between the overlapped X portions, and to obtain a smooth rotation operation without contacting the respective auger surfaces during auger rotation. If possible, the auger rods 1a, 1b, 1c are arranged in an odd-numbered array in parallel, and the auger rods 1a, 1b, 1c are connected in an interlocking manner via a gear mechanism provided in the support 3. The intermediate auger rods 1b in a row are rotated in the opposite direction to the rotation direction of the adjacent auger rods 1a and 1c adjacent to each other. In the drawing, reference numeral 6 denotes a mortar injection hole opened at the tip of the auger head 4, and 7 denotes a mortar infusion tube.

In particular, according to the present invention, each surface portion of the triangular surface forming each of the auger rods 1 is slightly curved inward as shown in FIG.
The auger rod 1 is formed by a curved surface 9 which is concave
Press the clamping rod 8 on each vertex of the outer periphery of the triangle
The space between adjacent auger rods 1
Part X ｀ is formed, and the earth and sand or the like to be introduced into the space part X ｀.
What can make the mixing effect better
Needless to say , the formation of the space portion X # serves as a refuge for air that can be filled into the hole when the pile hole is excavated, and can prevent the collapse phenomenon of the hole wall required by the suction action when the auger rod 1 is pulled out. .

According to the present invention, an excavator having the above-mentioned configuration is used by hanging it on a multi-axis excavator A.
a, 1b, and 1c respectively rotate forward and reverse simultaneously, and each of the triangular auger rods 1a is attached to the triangular auger rod 1a by the simultaneous forward and reverse rotation.
By rotating the pressing rods 8, 8 , 8 alternately, the peripheral wall of the hole is alternately struck and drilled in the ground while repeatedly performing tapping tightening and excavation, and a connection hole B of a fixed length is reliably and easily formed in the ground. Can be done.

[0010] Thus, by pulling up the entire apparatus from the connecting hole B excavated in the ground and simultaneously injecting a mortar or other coagulant into the excavation hole through the mortar injection hole 6 formed at the tip of the apparatus, the peripheral wall of the hole is firmly formed. The reinforced mortar connection layers P to P can be easily and reliably applied underground.

[0011]

As described above, the drilling device for a connecting hole according to the present invention has the auger rods 1a, 1b. c-shaped triangular or polygonal , and each auger rod surface is slightly curved inward
Into a curved surface, and suitable for each vertex at the outer periphery.
Disposed integrally with those diameter of clamping rods, the rotation locus b slightly polymerization was axially auger rod of a plurality of clamping rods of the side rotational locus a is at least adjacent respective clamping rods Because they are arranged and arranged in a row so that they can be rotated simultaneously in the forward and reverse directions, it is necessary to excavate pile holes without any deviation from the ground under any conditions, regardless of the ground. Can be made, and in the curved plane by the auger rod 1 on both sides
Pressing the space drilling sediment to introduce the (polymerization X1, X2) in
Mixing is performed well by the rotating action of the rod , and the mixed earth and sand is spread around the hole and, at the same time, firmly pressed against the peripheral wall of the hole by the rotation of the pressing rod. In addition to being able to easily and reliably excavate underground without excavating the soil, it is also possible to easily connect continuous mortar walls, which could not be used in the past, especially by introducing coagulant such as mortar simultaneously with excavation. There is an effect that the connection between the auger rods 1 and 1 on both sides can be more firmly joined together. Further above, a between adjacent auger rod 1,1 to have been formed by a curved surface to recessed each side portion inwardly稍湾song triangular shaped surface to form a auger rod 1
Of course, Ru effect Oh <br/> to better the mixing action to the polymerization X1, X2 interval Gayori large, and the blocking clogging of the soil causes introduced into between the side auger rod 1,1 in advance . In addition , by arranging the pressing rods 8 in a triangular shape at each apex portion of the outer periphery of the triangle where the auger rod 1 is formed, a space portion X 形成 is formed in each rod rod, thereby facilitating the elimination of spring water. In addition, it serves as a refuge for air generated during excavation of the pile hole, and has the effect of preventing the drop-down and collapse of the hole wall required by the suction action when the auger rod is removed.

[Brief description of the drawings]

FIG. 1 is a diagram of a digging hole of a connecting hole according to the present invention;

FIG. 2 is a front view of the digging apparatus;

FIG. 3 Same as above, bottom view,

FIG.

FIG. 5 is a cross sectional view showing a space part which is a main part of the present invention .
Area view,

FIG. 6 is a cross-sectional plan view showing a curved portion,

FIG. 7 is a plan view showing a completed construction body.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 auger rod 2 support shaft 3 support 4 auger head 5 excavating blade 6 mortar injection hole 7 mortar infusion tube 8 pressing rod 9 concave surface X overlapping portion X space

Claims (2)

(57) [Claims] 1. An upper portion of an auger head having a tip portion having an appropriately dug edge.
To form a curved surface, and to have an appropriate diameter
The auger rods whose overall shape is formed in a triangular cross section are integrally connected, and the rotation trajectories a of the respective auger rods in the axial direction are arranged. At least a plurality of auger rods are supported in parallel by a support so as to slightly overlap the rotation locus b of the auger rods on the adjacent side, and the intermediate auger rods arranged in the above-mentioned side are arranged on the adjacent auger rods. An excavator, which is interlockingly connected via an interlocking mechanism so as to rotate in a direction opposite to the rotation direction, is hung on a multi-axis excavator, and when driving power, the auger rods interlockingly connected in parallel are mutually positive. Simultaneous rotation in the opposite direction
Excavated debris by the action of forward and reverse rotation of the clamping rod to be arranged
A method of digging a continuous hole, characterized by digging in the ground while repeatedly pressing and digging a peripheral wall of the hole, and digging a continuous hole of a fixed length in the ground. 2. An upper surface of an auger head having an appropriately dug edge attached to a tip end thereof, each surface portion being slightly curved inward.
Recessed to form a curved surface, and an appropriate diameter at each vertex angle on the outer circumference
Auger rods having an overall shape formed in a triangular cross section are integrally connected to each other, and the auger rods are rotated in the axial direction by the rotation trajectories a of the respective auger rods. Is at least slightly overlapped with the rotation locus b of the auger rod on the adjacent side.
In order to support a plurality of auger rods in parallel and to support them in parallel, the intermediary auger rods arranged in parallel with each other are interlocked to rotate in the opposite direction to the rotation direction of the adjacent auger rods on both sides. A digging device for a connecting hole, wherein the digging device is connected in an interlocking manner.