JP2003336255A - Steel pipe pile with excavating blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe pile capable of being driven to penetrate the ground at a faster speed as compared with conventional piles, which pile does not produce waste sand and stone, etc., when the steel pipe pile is driven into the ground. <P>SOLUTION: Two excavating blades 4a, 4b are crossed with each other on one end of the pipe member 2 or the outer peripheral face 3 near the one end to without closing a cylinder bore 11 of the pipe pile member 2, enabling excavation. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe pile with an excavating blade, which is a kind of foundation pile that penetrates into a desired location on the ground at a construction site such as civil engineering and construction.

[0002]

2. Description of the Related Art Generally, at a construction site for construction of a civil engineering work or a building such as a building, a reinforcing bar cage pile, a steel pipe pile or the like is provided as a foundation pile at a desired portion of the ground to support the construction.

Among them, as a steel pipe pile with excavating blades that has been conventionally used, for example, as shown in FIG. 12, a pair of semicircular excavating blades 102 are symmetrically crossed at one end of a cylindrical steel pipe 101. The cylindrical hole 10 of the cylindrical steel pipe 101
It had a constitution in which it was fixed so as to block 3.

As another steel pipe pile with an excavating blade,
As shown in FIG. 13, one end of a cylindrical steel pipe 101 is formed by notching a part of an annularly formed steel plate and twisting it slightly, and an excavating blade 105 having blade portions 104 formed at both ends of the notch is fixed. It was a thing. In this steel pipe pile, cylindrical steel pipe 1
The cylindrical hole 103 at one end of 01 is opened without being blocked by the digging blade 105.

[0005]

However, the above-mentioned FIG.
In the steel pipe pile with the excavating blade shown in 2, when there is a boulder or the like in the ground while the ground is being penetrated by the pile penetrating device, the bottom surface of the excavating blade 102 is hit by the boulder or the like and cannot be penetrated. There was a problem such as.

Further, in the steel pipe pile with the excavating blade shown in FIG. 13 described above, the blade portion 104 at both ends of the excavating blade 105 has a small twist angle (intersection angle), and when it is rotated in one direction to penetrate, One of the blades 104, 104 cuts into the ground with one blade 104, and the penetration speed was slow.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the penetration speed of steel pipe piles into the ground at the civil engineering construction site or the construction site such as various buildings. It is intended to provide a steel pipe pile with an excavating blade that can be made faster than the above and does not generate waste earth and sand accompanying the intrusion.

[0008]

A steel pipe pile with excavating blades according to claim 1 is provided on one end of the pipe material for pile or on an outer peripheral surface near one end thereof.
In this structure, two excavating blades are provided so as to be excavable so as not to close the cylindrical hole of the pile pipe material.

In the steel pipe pile with a digging blade having the above construction, the digging blade side of the pile pipe material sandwiched by the pile penetrating device is erected on the ground surface of the ground, and the pile pipe material is turned by the pile penetrating device, whereby the excavating blade is cut. You can cut into the ground and penetrate smoothly and quickly. Further, when the steel pipe pile with an excavating blade penetrates into the ground, earth and sand in the ground enter the cylindrical hole from the lower end of the pipe material for the pile, so it is not necessary to discard the earth and sand.

The steel pipe pile with excavating blades according to claim 2 is the steel pipe pile according to claim 1.
In the construction of the steel pipe pile with a drilling blade according to the description, the pipe material for the pile is
This configuration is characterized by having a spiral projection on the outer peripheral surface.

When the steel pipe pile with an excavating blade is rotated into the ground by the above-mentioned structure, the spiral projection easily penetrates into the ground due to being caught in the ground. In addition, the resistance against the upward pulling force also increases.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on a steel pipe pile with a drilling blade shown in the drawings. 1 is a perspective view of a steel pipe pile with an excavating blade according to an example of the present invention, FIG. 2 is a side view showing the excavating blade of FIG. 1, FIG. 4 is a front view of the steel pipe pile with an excavating blade of FIG. 1, and FIG. 5 is an excavating blade. FIG. 6 is an explanatory view showing an example of a penetrating work of a steel pipe pile with a cover, FIG. 6 is an explanatory view showing an excavating blade of another example, FIG. 7 is an explanatory view showing an excavating blade of another example, and FIG. 8 is FIG. 6 and FIG.
FIG. 9 is a perspective view of a steel pipe pile with a drilling blade according to another example of the present invention including the drilling blade and the connection structure 14 shown in FIG. 9, FIG. 9 is a perspective view of a steel pipe pile with a drilling blade according to another example of the present invention, and FIG. Explanatory drawing which shows the other end 15 of the pipe material 2 for piles, and the connection structure 14, FIG. 11 is explanatory drawing of the state which attached the connection structure 14 to the other end 15 of the pipe material 2 for piles.

In these figures, a steel pipe pile 1 with excavating blades shown in FIGS. 1 to 4 is composed of a pile pipe material 2 made of a cylindrical steel pipe or the like having an appropriate length and two excavating blades 4a and 4b. ing.

That is, the pile pipe material 2 (see FIG. 3).
At two positions facing each other at one end 2a (at intervals of 180 degrees) have an appropriate length in the longitudinal direction (the angle between the two blades to be described later is 30 to 40).
The cut portions 5a and 5b are formed by cutting into a depth (to a degree), and the inclined surface portion 7a that is inclined in a spiral shape is formed by cutting from one end 2a of the one cut portion 5a to the cut end 6b of the other cut portion 5b. Similarly, an inclined surface portion 7b is formed by cutting from the one end 2a of the other cut portion 5b to the cut end 6a of the cut portion 5a and inclining spirally.

The two cutting blades 4a and 4b (see FIGS. 1 and 2) are made of steel plates in a semi-annular shape and are twisted so that they can come into contact with the inclined surface portions 7a and 7b. They have the same shape and the same size. Each drilling blade 4
Both ends of a and 4b are processed and formed so as to become the blade portions 8a and 8b.

The inclined surface portions 7a and 7b formed on the end 2a of the one end portion 2b of the pile pipe member 2 are welded by bringing the surfaces on the inner diameter end side of the excavating blades 4b and 4a into contact with each other. .
Both digging blades 4a fixed to the pile pipe material 2 in this way,
When the steel pipe pile 1 with a digging blade is viewed from the front (see FIG. 4), 4b is in a state where it intersects with the ground so that it can be digged. The intersection angle between them is about 30 degrees, and the one end portion 2b of the pile pipe member 2 may be formed such that the angle is 30 degrees or more or 30 degrees or less.

When the steel pipe pile 1 with an excavating blade having the above-mentioned structure (see FIG. 5) is to be penetrated to a desired position of the ground 9 at a construction site, the pile pipe material 2 is excavated by the pile penetration device 10. The blades 4a, 4b are held with the sides down, and the pile pipe material 2 is vertically raised with respect to the ground surface and lowered while rotating in one direction. As a result, among the blade portions 8a, 8a, 8b, 8b (see FIGS. 1 and 2) at the two locations of each excavating blade 4a, 4b,
One blade portion 8 of each of the drilling blades 4a and 4b in the rotation direction
a, 8b cut into the ground 9, and each blade 8a,
In combination with the intersecting angle of 8b, the steel pipe pile 1 with an excavating blade can be smoothly and quickly penetrated into the ground 9.
Further, even if the tip hits a boulder or the like while the steel pipe pile with an excavating blade 1 penetrates into the ground 9, the cobblestone or the like directly below the pile pipe material 2 must be discarded because it enters the tube hole 11 of the pile pipe material 2. There is no generation of earth and sand or boulders that must be maintained.

The vicinity 2b of one end of the pipe material 2 for pile (one end 2
The two above-mentioned excavating blades 4a and 4b may be symmetrically arranged and fixed to the outer peripheral surface 3 near (a) or at a position slightly apart from (a) via the pipe material 2 for piles. In this case, the excavating blades 4a and 4b and the one end 2a of the pile pipe material 2 are slightly separated from each other, and when the steel pipe pile 1 with the excavating blade is erected on the ground surface, the excavating blade 4a,
One end 2a of the pipe material 2 for piles hits the ground surface first and becomes a positioning means rather than 4b, and the steel pipe pile 1 with an excavating blade can be accurately penetrated at the penetration position.

As a matter of course, as the positioning means, in the steel pipe pile 1 with a drilling blade of the above example in which the drilling blades 4a and 4b are fixed to one end 2a of the pile pipe material 2, one end 2a or the lower surface of the drilling blades 4a and 4b is provided. Even if a protrusion (not shown) is provided at one or more places, the protrusion pierces the ground surface and the steel pipe pile 1 with a cutting blade can be accurately positioned and penetrated at the penetration position in the same manner as above.

FIGS. 6 and 7 show another example of excavating blades 4a and 4b.
(For convenience, reference numerals are the same as those used in the above example). The excavating blades 4a and 4b of this example are different from the above-described examples in shape, and in FIG. 6, a semicircular outer peripheral arcuate portion 12 is formed with an arcuate notch 12a in the center. Further, in FIG. 7, a concave portion 12b is formed in the central portion of the semicircular outer circumferential arc portion 12.

In the steel pipe pile 1 with excavation blade of the present invention, a spiral projection 13 may be formed on the outer peripheral surface of the pile pipe material 2 as shown in FIG. The spiral protrusions 13 may be formed on the inner peripheral surface of the pipe material 2 for piles or on the inner peripheral surface.

Further, as shown in FIGS. 10 and 11, the other end portion 15 of the pile pipe material 2 of the steel pipe pile with excavating blade 1 of each of the above-mentioned examples.
Is provided with a connecting structure 14 for connecting with a construct constructed above. That is, a plurality of locking pieces 16 are fixed to the outer peripheral surface of the other end 15 of the pile pipe member 2 at appropriate intervals for locking the connection structure 14.

The above-mentioned connecting structure 14 is the steel pipe pile 1
It is composed of a pair of flat annular bodies 17a, 17b having an inner diameter slightly larger than the outer diameter and a plurality of reinforcing bars 18, and the through-cylindrical holes 19 are formed in the annular body 17a at a predetermined interval, and Reinforcing bars 18 are provided on the other ring-shaped body 17b for each of the above-mentioned ring-shaped bodies 17a, and the through cylinder holes 19 of the ring-shaped body 17a are provided.
The reinforcing bars 18 through the annular body 17a.
The annular body 17a and each rebar 1 at a position where is projected by a predetermined length.
8 and 8 are fixed. Further, the annular body 17b is formed with a notch hole 20 through which each locking piece 16 of the pile pipe member 2 is inserted. The connecting structure 14 is fitted to the other end portion 15 of the pile pipe member 2 through each locking piece 16 corresponding to the cutout hole 20 of the annular body 17b, so that each connecting structure 14 passes through the cutout hole 20 of the annular body 17b. The locking piece 16 hits the lower surface of the upper annular body 17a and locks. As a result, the connecting structure 14
Can be attached to the other end 15 of the pile pipe 2.

In the steel pipe pile with excavating blades of the present invention, the excavating blades may be changed in design so that three or more excavating blades are provided in the pile pipe material 2. Further, the material, diameter, thickness and length of the pile pipe material 2 are not particularly limited. Further, the shape, size, thickness, material, etc. of the excavating blade are not particularly limited, and the design may be changed arbitrarily.

[0025]

As is clear from the above description, in the steel pipe pile with excavating blade of the present invention, two excavating blades are provided in the tubular hole of the pipe material for piles on the outer peripheral surface at one end or near one end of the pipe material for piles. Since it is provided so that it can be excavated without blocking it, the excavating blade cuts into the ground and can penetrate smoothly and quickly, and earth and sand and stones etc. There is no need to prevent it from entering the tube hole from the lower end of the pile pipe material, and it is not necessary to dispose of the earth and sand after the penetration or to backfill the tube hole of the penetrated steel tube pile. Therefore, in the steel pipe pile with an excavating blade of the present invention, the work time for embedding the steel pipe pile can be shortened and the construction work cost can be reduced.

Further, since the steel pipe pile with excavating blade of the present invention has a spiral projection on the outer peripheral surface of the pipe material for pile, when the steel pipe pile with excavating blade is rotated to penetrate into the ground, it is spirally wound. It becomes easy to penetrate into the ground by the biting of the protrusions into the ground. Further, the resistance against the upward pulling force also becomes large.

[0027]

[Brief description of drawings]

FIG. 1 is a perspective view of a steel pipe pile with an excavating blade according to an example of the present invention.

2 is a side view showing the digging blade of FIG. 1. FIG.

FIG. 3 is an explanatory view showing the processing and forming of one end of the pile pipe material.

FIG. 4 is a front view of FIG.

FIG. 5 is an explanatory view showing an example of a penetration work of a steel pipe pile with an excavating blade.

FIG. 6 is an explanatory diagram showing another example of an excavating blade.

FIG. 7 is an explanatory view showing an excavating blade of another example.

FIG. 8 is a perspective view of a steel pipe pile with a digging blade according to another example of the present invention including the digging blade and the connection structure 14 shown in FIGS. 6 and 7.

FIG. 9 is a perspective view of a steel pipe pile with an excavating blade according to another example of the present invention.

FIG. 10 is the other end portion 15 of the pile pipe member 2 and the connecting structure 14.
It is explanatory drawing which shows and.

FIG. 11 is an explanatory view showing a state where the connection structure 14 is attached to the other end portion 15 of the pile pipe member 2.

FIG. 12 is an explanatory view of a conventional steel pipe pile with an excavating blade.

FIG. 13 is an explanatory view of another conventional steel pipe pile with an excavating blade.

[Explanation of symbols]

1 Steel pipe pile with excavating blade 2 Pile pipe material 2a One end 2b One end 3 outer peripheral surface 4a drilling blade 4b drilling blade 11 tube hole 13 Spiral protrusion

Claims (2)

[Claims] 1. An excavating blade, characterized in that two excavating blades are provided on one end of a pile pipe material or on an outer peripheral surface in the vicinity of the one end so that they can be excavated without blocking a tubular hole of the pile pipe material. Steel pipe pile with. 2. The steel pipe pile with an excavating blade according to claim 1, wherein the pile pipe material has a spiral projection on its outer peripheral surface.