JPH10159085A - Method of drilling construction of connecting pit and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excavate a large number of pile pits connected into the ground simultaneously without nearly discharging excavated materials onto the ground while preparing a mortar continuous wall, in which a pit peripheral wall is compacted firmly. SOLUTION: Auger levers 1a, 1b, 1c, in which the whole shapes are formed in a triangular sectional shape, are continuously connected integrally to the upper section of an auger head 4, in which a pre-excavation edge 5 having a proper shape is annexed at a front end section. Three rows or five rows in a rank in the axial direction of a plurality of the auger levers are supported in parallel by supporters 3 so that the rotating levers of each auger lever are superposed slightly to the rotating loci of the auger levers on at least the adjacent side at that time. When the intermedate auger lever 1b is interlinked and connected through interlinking mechanisms so as to be reversely rotated in the direction of rotation of the adjacent auger levers 1a, 1c on both sides, and hung to a multishaft excavator at the time of the execution of works and power is driven, the interlocked and connected auger levers 1a, 1b, 1c are simultaneously rotated forward and reversely, the auger levers are propelled in the ground while repeating the compaction and excavation of pit peripheral walls by the outer circumferences of each triangular auger lever, and a connecting pit in constant length is drilled into the ground.

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, a large number of single pile holes are individually and continuously drilled in the ground, not only when the solid rock is buried at the tip of each single pile, but also when the solid pile is buried at the tip of each single pile. 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 simultaneously with the excavation of the pile hole, without using a normal screw auger. A plurality of auger rods each having a triangular cut surface of the auger surface formed as a shape are connected in a row, and the intermediate auger rod is connected to the adjacent auger rod in a reverse rotation to form the above-described configuration. As described above, the foreign matter that has caught between the auger rods is naturally removed from the outside of the rods, and at the same time, the sediment mixed with the auger is reliably mixed with the condensing material. Due to the rotation of the triangular outer peripheral edge, the entire amount of the above-mentioned excavated soil is pressed against the peripheral wall without discharging 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 trajectories a of the auger rods 1 are at least partially overlapped with the rotation trajectories b of the auger rods 1 on the adjacent side. The position of the auger rod 1b is interlockingly connected via an interlocking mechanism so that the auger rod 1b at the position is rotated in the reverse direction with respect to the rotation direction of the adjacent auger rods 1a and 1c. According to the present invention, the excavator having the above-mentioned configuration is suspended from the multi-shaft excavator A at the time of construction, and the auger rods 1a, 1b, 1c which are interlockingly connected in parallel in driving power are simultaneously rotated forward and reverse. Digging in the ground while repeatedly pressing and excavating the hole peripheral wall at the outer periphery of each of the triangular auger rods 1a, b, c by the forward / reverse simultaneous rotation;
It is characterized in that a connection hole E of a certain length is dug 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. The soil around the hole is alternately cut in the order of triangles a → a → c, and the excavated soil is simultaneously pumped into the space X1 between the triangles of the adjacent auger rods 1b as the auger rotates. And mixing the mixed earth and sand with the reverse rotation of the auger rod 1b on the adjacent side and
The excavated debris is sequentially pressed against the hole peripheral wall by the rotation of a → a → c to form a strong hole peripheral wall. Further, the auger excavation excavates the surrounding soil by the rotation action of each of the triangular edges b → a → c of the central auger rod 1b, and at the same time, the auger rod 1c which rotates the excavated soil in the reverse direction (forward rotation) on the next adjacent side. Into the space X1 → 2 in the triangular plane of
c By rotating a → a → c, the excavated debris can be pressed against the peripheral wall of the hole to form a strongly pressed continuous wall connecting the peripheral wall of the hole underground. That is, in the present invention, the central auger rod 1b is connected so as to rotate in the opposite direction to the auger rods 1a and 1c on both sides, and further, the overall shape of each auger rod 1 is formed in a triangular shape. The rotation directions of the triangular edges a-c by the respective auger rods 1a to 1c become different directions, so that the excavation and pressurization around the hole are performed simultaneously in the front and rear along with the excavation, so that the solid connection hole B can be reliably excavated. Of course,
In particular, the auger rod 1a and the adjacent auger rods 1b and 1c are disposed so as to perform simultaneous forward and reverse rotation, and the spaces X1 and X2 are formed between the auger rods 1a to 1c. At the same time as excavation in the ground, the surrounding soil excavated in each space X is mixed well, and the mixed earth and sand is pressed against the peripheral wall surface of the hole, so that a strong consolidation connection hole can be easily and reliably placed in the ground. It can be found.

[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
a, b. The upper and lower supports 3 so that the rotation trajectories a, b, and C of c overlap each other with the rotation trajectories of the adjacent auger rods 1.
(Swing support) to support in parallel. As shown in FIG. 4, the support shafts 2-2 are arranged in parallel on a straight line BB as shown in FIG.
B, so that each auger rod 1a, b. The rotation trajectories a, b, and c of c interlock with each other to automatically determine the interval between the overlapped X portions, so that a smooth rotation operation can be obtained without contacting the respective auger surfaces during auger rotation. Further, the auger rods 1a, b. c are arranged in an odd-numbered array structure, and each of the auger rods 1a, 1b,. In the interlocking connection of c through the gear mechanism provided in the support 3, the intermediate auger rods 1b in odd rows are rotated in the reverse direction to the rotation directions 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 the present invention, each of the above-mentioned auger rods 1 is provided.
The above-mentioned polymerization X is performed by forming each surface portion of the triangular surface which forms
The space in the portion becomes larger, and the mixing action of the earth and sand introduced into the curved surface can be performed more favorably. As another embodiment, as shown in FIG.
A space X 柱 is naturally formed in the auger rod 1 by arranging a pillar rod 1A of an appropriate diameter in a triangular shape radially around the support shaft 2 at each apex of the outer periphery of the triangle where the auger rod 1 is formed. The space portion X # serves as an escape space for air filling the hole when excavating the pile hole, thereby preventing the collapse phenomenon of the hole wall required by the suction action when the auger rod 1 is pulled out. I can do it. Further, as shown in FIG. 6, an introduction plate 9 is integrally provided between the clamping rods 8 to 8 formed in a triangular shape, so that the excavation can be introduced and stacked on the surface of the introduction plate 9. Mixing earth and sand well,
In addition, the earth and sand to be mixed is forcibly spread to the outer periphery of the auger, so that a better pressing action of the hole peripheral wall can be obtained. In the above embodiment, the auger rod 1 has a triangular shape. However, it is also possible to use a four-sided, hexagonal or other polygonal shape in addition to the triangular shape depending on the surrounding ground and the like.

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 simultaneously rotate in the forward and reverse directions, respectively. Due to the simultaneous rotation operation in the forward and reverse directions, the outer peripheral wall of the triangular auger rod 1a is alternately struck and drilled in the ground while repeatedly striking and excavating the peripheral wall of the hole. In addition, it is possible to reliably and easily make a continuous hole B having a fixed length in the ground.

[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. A plurality of auger rods are simultaneously axially forwardly and reversely formed so that the c-shape is formed in a triangular or polygonal shape, and the rotation trajectory a of each auger rod slightly overlaps the rotation trajectory b of at least the adjacent auger rod. Since it is arranged and arranged in a row so as to perform rotation, it is possible to excavate a pile hole without any inclination to the driving direction even if the ground is under any conditions, In addition, the excavated earth and sand introduced into the overlapped X space inside the triangle by the auger rods 1 on both sides is mixed well, 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 rotating action of the outer peripheral surface of the triangle. Drilling of a solid connection hole can be done easily and easily in the ground without almost excavating earth and sand on the ground. Impossible Has the effect of such occupies more firmly coupled perform cooperative position between the side auger rod 1,1 conjunction obtained easily obtained there was interaction activity to mortar continuous wall.

Further, according to a third aspect of the present invention, each of the triangular surfaces on which the auger rod 1 is formed is formed by a curved surface which is slightly concavely inwardly curved.
The space in the part is larger and the auger rods 1, 1 on both sides
In addition to preventing clogging of the soil introduced into the space, there is an effect of improving the mixing action.

Further, as shown in claim 4, pressing rods 8 to 8 of an appropriate diameter are radially arranged in a triangular shape around the support shaft 2 at each apex of the outer periphery of the triangle forming the auger rod 1. With such a configuration, a space portion X ｀ is provided in each rod rod.
Is formed to facilitate the elimination of spring water and to escape air generated during excavation of pile holes, which has the effect of preventing the dropping and collapse of the hole wall required by suction when the auger rod is removed. ing.

Further, as described in the fifth aspect, the mixing operation can be performed more reliably by integrally providing an introduction plate 9 between the clamping rods 8 formed in the triangular shape. There is an effect that the mixing earth and sand can be more firmly pressed against the peripheral wall of the hole.

[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 plan view showing another embodiment,

FIG. 6 is a cross-sectional plan view showing another embodiment of the present invention;

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 excavation blade 6 mortar injection hole 7 mortar infusion tube 8 compression rod 9 introduction plate

Claims (5)

[Claims] 1. An auger head having an appropriate shape of a cutting edge attached to a tip end thereof is integrally provided with an auger rod having a triangular cross section as a whole in an upper portion thereof. In the axial direction, a plurality of auger rods are supported by the support tool in parallel so that the rotation trajectory a of each auger rod slightly overlaps the rotation trajectory b of the auger rod on at least the adjacent side. A multi-axis excavator hangs an excavator that is interlocked and connected via an interlocking mechanism so that the intermediate auger rod to be arranged is rotated in a direction opposite to the rotation direction of the adjacent auger rods on both sides. In driving, the auger rods connected in conjunction with the parallel rotation simultaneously rotate in the forward and reverse directions, digging in the ground while repeatedly pressing and excavating the hole peripheral wall at the outer periphery of the triangular auger rod by the simultaneous rotation in the forward and reverse directions, Specially, drilling a continuous hole of a certain length Drilling method of connecting hole to be a feature. 2. An auger head having an appropriately shaped tip digging blade attached to a tip end thereof is integrally provided with an auger rod having an overall shape formed in a triangular cross-section on an upper part thereof. In the axial direction, a plurality of auger rods are supported by the support tool in parallel so that the rotation trajectory a of each auger rod slightly overlaps the rotation trajectory b of the auger rod on at least the adjacent side. A connecting hole excavating device, wherein an intermediate auger rod to be arranged is interlockingly connected via an interlocking mechanism so as to rotate in a direction opposite to a rotation direction of adjacent auger rods on both sides. 3. The connecting hole according to claim 2, wherein each surface portion of said triangular surface forming said auger rod is formed by a curved surface which is slightly concavely inwardly recessed. Drilling equipment. 4. A crimping rod having an appropriate diameter is disposed radially around a support shaft as a triangular shape at each apex of the outer periphery of the triangle forming the auger rod. 3. The drilling device for connecting holes according to claim 2. 5. A digging apparatus for connecting holes according to claim 2, wherein an introduction plate is integrally provided between each of said compression rods having a triangular overall shape. .