JP3019988B2 - Auger for hard ground excavation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a soil improvement method for construction and the like, in which not only soft ground, but also hard ground such as rock, in particular, can be dug easily and easily without oblique cutting in the axial direction. The present invention relates to an auger for excavating hard ground, which is the main purpose of the auger.

[0002]

2. Description of the Related Art Conventionally, in a ground improvement method for a foundation ground such as a building, a pile hole having a predetermined diameter is excavated in the ground for the purpose of the formation, and a condensing material such as mortar is filled in the pile hole. At the same time, there is generally known a method of forming a foundation ground in which pile columns and the like are cast as core piles to form a foundation column group. In addition, various types of excavators having a special shape corresponding to the construction ground have been developed as the above-mentioned excavation devices for pile holes, and most of them employ a screw-type excavating means using a screw auger. However, in the soil excavation method using the screw auger, there is no particular problem in the case where the construction ground is soft ground soil, but if there is a hard ground such as a rock under the excavation, However, it is very difficult to drill the hard rock only with a screw auger, and especially the hard rock is obstructed and the auger rod can be inclined to drill a precise pile hole in the vertical direction. If it was not forcibly performed, the auger would run idle and the screw blade would be damaged, as well as the power mechanism, and the pile driver would fall, causing a serious accident.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention uses a specially shaped excavator of the present invention to strongly destroy any hard ground and a predetermined depth in the ground while strongly destroying the rock. To make it possible to excavate a pile hole perpendicular to the ground very easily, and to firmly tighten the hole peripheral wall of the above-mentioned hole to provide an auger for soil excavation without soil excavation at the same time without fear of hole collapse. It is.

[0004]

The auger for excavating hard ground according to the present invention has a shape as shown in FIG. Are provided so as to project radially with respect to the rotation direction, and
A plurality of excavating blades 3, 3, 3 formed by rigid excavating blades 3a whose tips are curved with respect to the rotational direction are integrally connected to the upper portion of each of the excavating blades 2, and the respective excavating blades 3, 3, , 3 formed on the outer peripheral edge of the auger rod, the auger rod 6 being formed on the upper part of the auger having the special shape to form an imprint surface 5 of an appropriate shape on the peripheral part. Are integrally connected, and the excavated debris is firmly pressed against the peripheral wall of the hole at the same time as the excavation blade 3 rotates and excavates the ground.

Further, in the present invention, the auger for excavating the hard ground is integrally connected to a lower portion of the auger rod 6, and
Several such auger rods 6 are connected to the respective excavating blades 3, 3,
3 are arranged in parallel so as to overlap the rotation trajectory a ′ of the excavating blades 3 and 3 of the adjacent excavation auger and a part thereof, and the auger rod 6B on the intermediate side
Is supported via an interlocking mechanism so as to rotate in the opposite direction to the rotation direction of the auger rods 6A, C on both sides adjacent to each other,
By simultaneously rotating and driving the auger rods 6A, 6B, and 6C, it is possible to dig a continuous connection hole in the ground at once.

[0006]

Next, a construction example using the auger for ground excavation according to the present invention will be described. First, an excavator is set on a predetermined ground for excavation, and an auger rod 6 of an appropriate length is suspended from the excavator. An auger for hard ground excavation is connected to the lower end of the rod 6, and the auger head 1 rotates simultaneously with the rotation of the rod 6 to drive the power, and the ground is excavated by the excavating blade 2. When the auger tip comes into contact with the solid rock layer during such excavation, the tip shape of each excavating blade 3 is formed by the rigid hollowing blade 3a curved in the rotation direction. The rock is gradually crushed while being strongly drilled, and the crushed rock is moved upward by the rotating action of the concave notch edge 4 and the excavating blade 3 to make any hard ground, even a vertical borehole, in the ground. Drilling can be done reliably and easily.

Further, in the present invention, when excavating a connecting hole, as shown in FIGS. 2 and subsequent figures, an embossed surface 5 of an appropriate shape is formed on the peripheral portion, and this is The excavator is connected to the lower end of a specially shaped auger rod 6 formed in a triangular shape, several of which are arranged in parallel, and a plurality of auger rods 6A, 6B, Auger rods 6A, which are connected in parallel with each other in a row and supported by a multi-axis excavator to drive the power;
B and C excavate a predetermined ground while performing forward and reverse simultaneous rotation. In addition, since the rotation of the intermediate auger rod 6B is reversed in the direction of rotation of the auger rods 6A, 6C on both sides adjacent to each other, the rotation action of the pressing surface 5 of each rod 6A, B, C is performed. To excavate the ground while pressing the excavated debris against the hole peripheral wall, and at the same time, pressurize the excavated debris into the space where the auger rods 6A, B, and C overlap to obtain good mixing action. Can be done.
In particular, in the present invention, each auger rod 6A, B, C
Because the auger for hard ground excavation is connected to the rocker, even if there is a rock mass below any of the auger rods 6A, 6B, 6C, the rock mass is surely dug and crushed as described above, and At the same time, it is possible to easily form a continuous wall in which a vertical connection hole is excavated and the hole peripheral wall is firmly clamped.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
2, 2 are formed with rigid excavating blades 3a having protruding tips in the rotation direction and having a tip shape curved in the rotation direction above the excavation blades 2, 2, 2. Of the digging blades 3,3,3 are integrally attached,
Recessed notched edges 4 are respectively formed and provided on the outer peripheral edges of 3, 3. Although not shown, a hollow tube for extracting coagulant such as mortar and an inlet for mortar may be provided inside the auger head 1 in some cases. In addition, an auger rod of a normal shape or an auger rod 6 for forming an appropriately shaped earth pressure surface 5 on the periphery is integrally and continuously provided on the upper portion of the auger head 1.

Further, in the present invention, the above-mentioned auger for hard ground excavation is integrally connected to the lower portion of the auger rod 6 and used. As an example of the shape of the auger rod 6, as shown in FIG. By using clamping rods a, b, and c for forming the pressed surface 5 in a radially triangular shape with the support shaft 7 as an axis, the excavated excavated gravels are simultaneously formed on the peripheral wall of the hole. The rotation of the pressing rods a, b, and c can strongly prevent the pressing hole wall from collapsing.

Further, as an embodiment of using the auger for excavating hard ground according to the present invention, several auger rods 6 formed in the above triangular shape are used, and the rotation trajectories a of the respective excavating blades 3, 3, 3 are adjacent to each other. And the rotation trajectory a 掘 削 of the digging blades 3, 3, 3 of the adjacent digging augers and a part thereof are arranged in parallel so as to overlap with each other, and the intermediate digging blade 3 is connected to the adjacent digging blades 3 on both sides. By forming a structure that is supported and arranged via an interlocking mechanism so as to rotate in the opposite direction to the rotation direction, it is possible to easily dig a continuous connection hole underground.

[0011]

As described above, the auger for hard ground excavation according to the present invention has several cutting edges 2,
Each of the end portions is formed to protrude radially in the rotational direction, and is formed on the top of the excavating blades 2, 2, 2 by a rigid hollow blade 3a having a tip shape curved in the rotational direction. Since several excavating blades 3,3,3 to be provided are integrally connected, a concave cutout edge 4 is formed on the outer peripheral edge of each of the excavating blades 3,3,3. In addition, there is an effect that the borehole perpendicular to the axial direction can be easily excavated by hollowing out and drilling with the hollowing-out blade 3a provided on the peripheral edge of each of the drilling blades 3,3,3.

Further, as described in claim 2, an auger rod 6 for forming a pressed soil surface 5 having an appropriate shape on the periphery is integrally connected to an upper portion of the auger head 1 so as to form the excavating blade 3. At the same time as the excavation of the hard ground, the excavated rubble is firmly clamped to the peripheral wall without discharging the rubble to the ground, so that a pile hole without collapse is easily formed.

Further, the auger for hard ground excavation is integrally connected to a lower portion of the auger rod 6, and several auger rods 6 are connected to the respective excavating blades 3,
The rotation trajectories a and 3 are arranged in parallel so that the rotation trajectories a of the adjacent excavating augers 3 and 3 overlap with the rotation trajectories a of the excavating blades 3 and 3 and the auger rod 6B on the intermediate side.
Is configured to rotate in the direction opposite to the direction of rotation of the auger rods 6A and 6C on both sides adjacent to each other, so that a continuous connecting hole can be dug at once in the ground, and in particular, in the related art, Mixing of earth and sand, mortar, etc. between the pile holes at the time of connecting hole excavation was
It also has an effect that a connecting hole that is securely performed in the polymerization b formed therebetween and can be easily connected can be easily formed.

[Brief description of the drawings]

FIG. 1 is an overall front view of an auger for hard ground excavation according to the present invention;

FIG. 2 is a front view of a connection when excavating a connection hole;

FIG. 3 Same as above, bottom view,

FIG. 4 is the same as that of FIG.

FIG.

FIG. 6 is a sectional view of the auger rod according to the first embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auger head 2 Cutting edge 3 Cutting edge 3a Boring blade 4 Notched notch edge 5 Pressed soil surface 6 Auger rod 7 Support shaft

Claims (3)

(57) [Claims] At the lower edge of an auger head, a plurality of cutting blades are provided on the lower edge thereof so as to protrude radially with respect to the rotation direction. In addition, several excavating blades 3,3,3 formed by rigid excavating blades 3a whose tip shapes are curved with respect to the rotation direction are integrally connected to each other. An auger for hard ground excavation, characterized in that a concave cutout edge 4 is formed on the outer peripheral edge. 2. The auger for excavating hard ground according to claim 1.
In the above, an auger rod 6 for forming a pressed soil surface of an appropriate shape on the periphery is integrally provided on the upper part of the auger , and the excavation blade 3 rotates the ground to excavate the soil at the same time. An auger for excavating hard ground, characterized in that gravel is firmly pressed against the peripheral wall of a hole. 3. A plurality of auger rods 6 integrally formed with the auger for hard ground excavation according to claim 1 or 2.
A, B, and C are arranged in parallel so that the rotation trajectory a of each of the digging blades 3, 3, and 3 overlaps with the rotation trajectory a 'of the digging blades 3 and 3 of the adjacent digging auger and a part thereof. In addition, the intermediate auger rods 6B are supported via an interlocking mechanism so as to rotate the auger rods 6B on the intermediate side in a direction opposite to the rotation direction of the auger rods 6A and 6C on both sides adjacent to each other. An auger for hard ground excavation, characterized in that a plurality of auger rods 6A, 6B, 6C to be simultaneously rotated are driven to rotate at the same time to form continuous continuous holes in the ground.