JPS624577Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a concrete pile that has high strength against bending and tension, has high resistance against horizontal shearing force, and has excellent durability. .

Conventionally known examples of concrete piles reinforced with steel pipes include composite piles of steel pipes and concrete in which the outer periphery of a concrete pipe is covered with a steel pipe, and concrete piles in which a spirally wound steel band is buried within a concrete layer.

However, the former of the above-mentioned conventional examples has the disadvantage that it is necessary to take into account corrosion of the steel pipe, which makes handling it troublesome during design and construction, and that the manufacturing cost is also relatively high. The latter problem is solved because it is buried in the concrete layer, but since it is wound in a spiral, when you look at the horizontal cross section, there is ( The width of the steel strip (length cut diagonally) x (thickness of the steel strip) appears in only one place.

In this way, although the amount of steel strip used is large, there is only a small amount of steel strip buried within the horizontal cross section, and therefore the resistance to horizontal shearing force is small.
The drawback is that the reinforcing effect cannot be reflected in the design.

The purpose of the present invention is to provide a concrete pile that eliminates the drawbacks of the conventional concrete/steel pipe composite pile mentioned above while also using steel pipes as a reinforcing material. A penetrating steel pipe is buried in a concrete layer, and an internal concrete layer and an external concrete layer located inside and outside of the steel pipe are connected through a through hole provided in the steel pipe to form an integral structure as a whole. It is located on a concrete pile.

Hereinafter, the present invention will be explained in detail based on the embodiment shown in the drawings. In FIG. It is buried concentrically with the axis of the pile 1.

This steel pipe 3 is buried over the entire length of the concrete pipe 2, and a large number of oval holes 4a, 4a are penetrated through the pipe wall.

FIG. 2 shows another embodiment of the present invention, in which the steel pipe 3 has a number of rectangular holes 4b, unlike the one in FIG.
4b is installed through it.

The shape, arrangement method, spacing, etc. of the holes 4a, 4b are completely arbitrary and are not limited to those of the above embodiments, but it is desirable to determine them depending on the strength etc. required of the product.

The concrete pile according to the present invention is preformed in a factory or the like by centrifugal compaction. That is, if a steel pipe 3 with holes 4 inserted in advance is fixed in a horizontally placed tubular formwork, and concrete is poured into this formwork and rotated to apply a strong centrifugal force, a part of the concrete will steel pipe 3
The remaining concrete is filled into the gap between the formwork and the steel pipe 3 through the hole 4 provided in the hole 4, and the remaining concrete is pressed against the inside of the steel pipe 3, so that the inner and outer concrete layers are in close contact with the steel pipe 3, and the inner and outer concrete layers are They are connected through holes 4 in the steel pipes, forming a dense pile with an integrated structure.

Then, the product is made into a product by heat curing or autogrape treatment using conventional methods to increase its strength.

As mentioned above, according to the present invention, a steel pipe with a hole penetrated through the pipe wall is buried, so there is no risk of corrosion of the steel pipe and it is durable, and there is no need to consider corrosion allowance, so the design It is easy to handle during construction, and costs can be reduced by reducing the amount of materials used.

In addition, since the concrete layers inside and outside the steel pipe are firmly connected through the holes, and the steel pipe and concrete form an integral structure, bending and tensile strength increases synergistically, and external forces such as earthquakes, especially shearing force, There are various effects such as increasing the resistance against and being able to cope with it sufficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the concrete pile according to the present invention, and FIG. 1A is a perspective view of the main part, FIG.
FIG. 2 is a perspective view of main parts showing another embodiment. 1... Concrete pile, 2... Concrete pipe, 3... Steel pipe, 4a, 4b... Through hole.

Claims (1)

[Scope of utility model registration request] A steel pipe with many holes penetrated through the pipe wall is buried in a concrete layer, and the inner concrete layer and the outer concrete layer located inside and outside of the steel pipe are connected through the through holes provided in the steel pipe to integrate the whole. A concrete pile characterized by its structure.