JP2005155284A - Ground excavation equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve excavation and sediment guide performance of the lower surface of a concentrical enlarged disc provided at the lower end of a steel pipe casing and/or a concrete pole. <P>SOLUTION: The ground excavation equipment has a bottom plate 3 having a diameter larger than the outer diameter of a casing 1 at the lower end of the excavation casing 1 and/or its inner concrete pole 2, and is provided with downward tilting blades 5 and upward tilting blades 6 directed toward the rotational direction of the casing and/or the concrete pole 2 via the cut-out parts 4 formed in the large diameter part 3'. A downward central excavation blade 7 is protruded at the lower face central part of the bottom plate 3, and a spiral excavation blade 8 in a trapezoid vertical cross section moving from the side face of the central excavation blade 7 to the outer periphery of the casing 1 is fixed to the lower face of the bottom plate 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for excavating the ground without discharging earth and sand to the ground.

  Conventionally, a concentric disk with an enlarged diameter is provided at the lower end of a rotating steel pipe casing, a curved blade body is provided from the center of the lower surface of the disk to the circumferential portion of the casing, and excavated soil is excavated at the curved section by the blade body. Although it tried to induce consolidation on the wall, it was difficult to perform downward excavation and sediment induced consolidation smoothly.

  Further, the lower blade formed on the concentric disk is easily damaged by the resistance of the earth and sand, and the upper blade has the action of pressing the cutting earth and sand downward when the casing is raised, but it has a dislike that it is difficult to withstand the pressure and easily breaks ( For example, Patent Document 1).

Japanese Patent Application No. 2001-261482

  The present invention provides a concentric bottom plate having a large diameter in either the steel pipe casing or the concrete pile inserted in the steel pipe casing to excavate the ground to perform excavation drilling or pile driving to the ground, and to strongly excavate the ground. The purpose is to do.

In order to achieve the above object, the present invention firstly has a bottom plate having a diameter larger than the outer diameter of the casing for excavation and / or a concrete pile inside the excavation casing, and a notch portion formed in the large diameter portion. A downwardly inclined blade and an upwardly inclined blade facing the rotation direction of the casing and / or the concrete pile, and a downward central excavating blade projecting from the bottom central portion of the bottom plate, A ground excavation apparatus in which a trapezoidal spiral excavation blade having a vertical cross section extending from the side surface toward the outer periphery of the casing is fixed to the lower surface of the bottom plate;
Secondly, a plurality of cemented carbide tips project from the lower surface of the spiral digging blade, and the direction of the tip is inclined so that the inner end is on the bottom plate rotation direction side and the outer end is on the side where rotation is delayed from the inner end. A ground excavation device according to the first invention, which is provided and provided from an outer edge to an inner edge of the spiral excavation blade;
Third, the ground excavation device in the rotary ground excavation device according to the first or second invention, wherein the lower surface of the spiral excavation blade is flat,
Fourth, the rotary ground according to the first or second invention, wherein the lower surface of the spiral digging blade is formed so as to be gradually higher from the center of the bottom plate toward the spiral tip and gradually thinner. Ground excavation equipment in drilling equipment,
Fifth, a ground excavation apparatus in the rotary ground excavation apparatus according to any one of the first, second, and fourth inventions, wherein a tapered surface inclined toward the bottom plate is formed inside the spiral excavation blade.
Sixth, the ground excavation device in the rotary ground excavation device according to any one of the second to fifth inventions, wherein the cemented carbide tip forms an inclined surface that is thick on the rotation direction side of the bottom plate and thinly inclined on the opposite side. ,
Seventh, the ground excavation device according to any one of the first to sixth inventions, wherein the two spiral excavation blades are fixed to the lower surface of the bottom plate symmetrically from both side surfaces of the downward central excavation blade,
Eighth, the large-diameter bottom plate is fixed to the concrete pile side that is inserted into the excavating casing and engaged in the rotational direction, the upward inclined blade is provided on the casing side, and the downward inclined blade is provided on the concrete pile side. The ground excavation device according to any one of the first to seventh inventions,
Consists of.

Therefore, in steel pipe casing piles, concrete piles, recovery casing / concrete piles or local reinforced concrete, etc. Expanding the excavation in a spiral from the outside to the
The pile bottom is excavated while pushing the excavated soil in a spiral shape, the excavated soil is excavated with the downward inclined blade of the outer peripheral part of the bottom plate, and the excavated earth moving upward is held downward with the upward inclined blade And is consolidated downward.

  The spiral excavating blade is thick at the center of the bottom plate and thins downward as it goes to the end of the spiral, so the excavated earth is guided outward from the central portion and moves in a spiral shape in the oblique direction to the downward inclined blade. Be redeemed.

  The spiral excavation blade has a tapered surface on the inner side toward the lower surface of the bottom plate, and the excavation blade can sharply cut the bottom of the pile hole into a spiral shape.

  Further, a plurality of cemented carbide tips are projected from the lower surface of the spiral excavation blade, thereby enhancing the excavation force on the bottom surface of the pile hole.

Since this invention was comprised as mentioned above, there exists an effect which can perform excavation of a soilless type | formula ground pile rapidly.

  In particular, it is possible to cope with hardened ground by projecting a tip on a spiral excavation blade.

  A casing 1 for excavation shown in FIG. 1 is a male provided on the bottom plate 3 in the female key hole in the rotational direction of the casing 1 on the large diameter concentric bottom plate 3 of the concrete pile 2 welded to the lower end of the concrete pile 2. The key-shaped protrusion is engaged and placed on the bottom plate 3.

  The bottom plate 3 has a large-diameter outer peripheral portion 3 ′ formed with notched portions 4, 4 at symmetrical positions, and a downward inclined blade 5 facing the rotation direction of the concrete pile 2 and an upward inclined blade welded to the outer periphery of the casing 1. 6 is fixed to both edges of the notches 4 and 4.

  The bottom plate 3 thus formed is a flat plate in FIG. 1, but is formed in a conical shape as shown in FIG. 8, and a water hole or cement milk hole 9 and its check valve 10 are provided in the center. it can.

  A downward center excavation blade 7 is projected from the bottom center of the bottom plate 3.

  As shown in FIG. 1B from the side surface (starting end) of the central excavation blade 7, a spiral excavation blade 8 facing the outer periphery of the casing 1 is welded and fixed to the lower surface of the bottom plate 3. Then, the thickness T of the blade 8 can be made constant (FIG. 5 (c)), or can be gradually inclined from the thickness T of the central portion to the thickness t of the end (FIG. 5 (b)).

  A plurality of (four) elongated carbide tips 11 project downward from the lower surface of the spiral excavating blade 8, and the tip 11 is oriented so that the inner end of the tip 11 is in the direction of rotation of the bottom plate 3. Yes, the outer end is inclined from the inner end to the side where the rotation is delayed, and is provided from the outer edge 8 ′ to the inner edge 8 ″ of the spiral excavating blade 8. An inclined surface 11 ′ that is thinly inclined is provided on the side (FIG. 2B).

  The lower surface of the spiral digging blade 8 is flat (FIG. 4 (d)), or the starting lower surface 8a of the digging blade 8 is formed so as to be gradually thinner toward the spiral terminal lower surface 8b (FIG. 1). (A), FIG. 5 (B), FIG. 7 (A)).

  Furthermore, the inner edge 8 ″ of the spiral excavating blade 8 can be cut to form an inclined surface 8c (FIGS. 1 (A) (B), 4 (B) (C), and FIG. 5 (A) (B). (C) FIG. 7 (B)).

  Further, as shown in FIG. 2 (b), the carbide tip 11 is formed with a taper surface (inclined surface) 11 'by forming the spiral excavation blade 8 in the longitudinal direction with the rotational direction side being high and the opposite side being low. Sharpness can be increased.

  Further, as shown in FIGS. 3 (a) and (b), a carbide tip 11 can be projected along the inner edge or outer edge of the spiral excavation blade 8, and the tip 11 is substantially triangular and has a rotation direction a side. The blade 11a can be formed.

  The bottom plate 3 is welded to the lower end of the large-diameter steel casing 1 to perform excavation without excavation, and concrete is placed by installing reinforced concrete inside. It is possible to increase the yield strength due to the fluctuation of the ground of the building or structure.

  When the steel casing 1 is inserted into the outer periphery of the concrete pile 2 to which the bottom plate 3 is fixed and both the parts 1 and 2 are engaged with each other, the steel casing 1 is reversely rotated after being placed and pulled up to the ground. The outer excavated soil is consolidated downward by an upward inclined plate (plate-like blade) 6 provided at the lower end of 1.

  Further, the above-mentioned large-diameter bottom plate 3 is fixed to the lower ends of the steel casing 1 or the concrete pile 2, the excavated earth and sand is pressed down on the large-diameter portion 3 ', and the inner surface of the pile hole is excavated, and a large excavation is performed. The diameter part 3 'prevents the swinging and lifting of the pile and stabilizes the pile.

(A) The figure is a front view of the excavation blade of the present application in the above-mentioned engaged state between the steel casing and the concrete pile, and (b) is a bottom view of (b). (A) The figure is a bottom view of the embodiment of FIG. 1 (b), (b) The figure is (a) a front view of the cemented carbide tip along the line AA, (c) The figure is the upper surface of the spiral excavation blade It is a bottom view of a flat state. (A) The figure is a bottom view of the triangular chip planting state, (b) the figure is (a) a side view taken along the line BB in FIG. (A) The figure is a bottom view of the spiral excavating blade with the top surface flat, (b) The figure is a bottom view in which the spiral excavating blade is formed with a tapered surface, (c) The figure is (b) a longitudinal section along line BB. FIG. 4D is a longitudinal sectional view taken along line CC in FIG. (A) The figure is a bottom view in which a spiral digging blade is formed with a tapered surface. (B) The figure is a front view of the figure (b). (C) The figure is the spiral digging blade shown in the figure (a). It is the front view which formed the taper surface. It is a bottom view of the state which provided two spiral excavation blades in the center symmetrical state. (A) The figure is a longitudinal sectional view of the state where the bottom plate is welded to the lower end of the steel casing and the concrete pile is inserted inside, and (b) is a bottom view of (b). It is a longitudinal front view showing a conical bottom plate, a central excavation blade, a water injection hole, a check valve, and a spiral excavation blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation casing 2 Concrete pile 3 Bottom plate 3 'Large diameter part 4 Notch part a Rotation direction 5 Downward inclined blade 6 Upward inclined blade 7 Downward central excavation blade 8 Spiral excavation blade 8' Outer edge 8 "Inner edge 8c Inclined surface 11 Carbide tip 11 'Tapered surface T, t Thickness

Claims (8)

A bottom plate having a diameter larger than the outer diameter of the casing at the lower end of the excavation casing and / or the concrete pile inside thereof;
A downward inclined blade and an upward inclined blade facing the rotation direction of the casing and / or the concrete pile are provided through a notch portion formed in the large diameter portion,
A downward central excavation blade projects from the center of the bottom surface of the bottom plate, and a trapezoidal spiral excavation blade having a vertical cross section extending from the side surface of the central excavation blade to the outer periphery of the casing is fixed to the lower surface of the bottom plate. Ground excavator.   Protruding a plurality of cemented carbide tips on the lower surface of the spiral excavation blade, the direction of the tips is provided with the inner end inclined to the rotation direction side of the bottom plate and the outer end inclined to the side of the rotation delayed from the inner end, The ground excavation device according to claim 1, wherein the ground excavation device is provided from the outer edge to the inner edge of the spiral excavation blade.   The ground excavation apparatus in the rotary ground excavation apparatus according to claim 1 or 2, wherein a lower surface of the spiral excavation blade is flat.   The ground excavation in the rotary ground excavation device according to claim 1 or 2, wherein a lower surface of the spiral excavation blade is formed so as to be gradually higher from the center of the bottom plate toward the spiral tip and gradually thinner. apparatus.   The ground excavation apparatus in the rotary ground excavation apparatus according to claim 1, wherein a tapered surface inclined toward the bottom plate is formed inside the spiral excavation blade.   The ground excavation device in the rotary ground excavation device according to any one of claims 2 to 5, wherein the cemented carbide tip is formed with an inclined surface that is thick on the rotation direction side of the bottom plate and thinly inclined on the opposite side.   The ground excavation device according to any one of claims 1 to 6, wherein the two spiral excavation blades are fixed to the lower surface of the bottom plate symmetrically from both sides of the downward central excavation blade.   The large-diameter bottom plate was fixed to the concrete pile side that was inserted into the excavating casing and engaged in the rotational direction, the upward inclined blade was provided on the casing side, and the downward inclined blade was provided on the concrete pile side. The ground excavation apparatus in any one of Claims 1-7.

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