JP2017186790A - Head part cover for steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head part cover, inexpensively manufacturable, and easy in handling, by securing tight fitting in response to it even when a steel pipe pile is not complete round, by tightly and stably fitting to an inner surface of the steel pipe pile.SOLUTION: A head part cover for a steel pipe pile put on a head part of the installed steel pipe pile when constructing a foundation of a structure on its steel pipe pile by installing the steel pipe pile in the ground, comprises a flange part 2 of the circular contour formed by press-working a steel plate and having an outer diameter D larger than an inner diameter of at least the steel pipe pile and a substantially triangular cylindrical recess part 4 formed on the inside of its flange part 2 and forming a substantially triangular shape of a circular arc shape in both corner parts 3 of three places in a plan view. The recess part 4 of the substantially triangular cylindrical shape is a shape of having a contour dimension pressed in an inner surface of the steel pipe pile in the circular arc-shaped corner parts 3 of the three places when putting the head part cover on a head part of the steel pipe pile.SELECTED DRAWING: Figure 1

Description

  This invention relates to the head cover for steel pipe piles used when it is necessary to cover the head after placing the steel pipe pile.

When constructing a steel pipe pile in the construction of a structure such as a building and constructing a concrete foundation such as a concrete foundation on the steel pipe pile, excavate around the cast steel pipe pile and raise the steel pipe pile to a predetermined height. After cutting at this position, the concrete foundation is constructed.
If the head of the steel pipe pile remains open at that stage, crushed stone and concrete will enter the steel pipe pile when laying crushed stone or placing concrete. Put on.
Conventionally, as shown in FIGS. 5 (a), 5 (b), and 5 (c), a rectangular plate 12b is welded and fixed perpendicularly to one side surface of the disc 12a to form a T-shaped cross section. The head cover 12 is covered.

In the said conventional head cover 12, the case where it cannot closely fit to the inner surface of the steel pipe pile 10 tends to arise.
That is, the rectangular plate 12b fitted to the inner surface of the steel pipe pile is fitted in the diameter direction of the pipe, but the steel pipe pile 10 is often not a perfect circle. In this case, depending on the position of the rectangular plate 12b, The surface may not be tightly fitted. Further, the fitting only in the diameter direction of the tube has low stability, and it is difficult to achieve a close fitting unless the length of the rectangular plate 12b is accurate.
Further, the head cover 12 requires processing for making the disc 12a, processing for making the rectangular plate 12b, and processing for welding the rectangular plate 12b to the disc 12a, which is troublesome and increases the cost.
In addition, the shape of the circular plate and the rectangular plate 12b having a T-shaped cross section may be bulky and difficult to handle when storing or carrying a large number of pieces.

  An object of the present invention is to provide a head cover for a steel pipe pile in which the above-mentioned conventional drawbacks are eliminated.

The invention of claim 1 which solves the above-mentioned problem is a steel pipe pile which is placed on the head of the cast steel pipe pile when the steel pipe pile is placed in the ground and the foundation of the structure is constructed on the steel pipe pile. A head lid for
A steel plate is press-worked, and has a circular contour flange having an outer diameter larger than the inner diameter of at least the steel pipe pile, and three corners formed in an arc shape on the inner side of the flange. A substantially triangular cylindrical dent portion that forms a substantially triangular shape, and the substantially triangular cylindrical dent portion is located at the three arcuate corners when the head cover is placed on the head of the steel pipe pile. It is the shape which has the outline dimension press-fitted in the inner surface of a steel pipe pile.

  Claim 2 is the head cover for the steel pipe pile according to claim 1, wherein the longitudinal section of the arc-shaped corner of the dent portion is inclined inwardly in plan view toward the bottom plate side of the dent portion. It is characterized by having.

According to the head cover of the present invention, it is easy to fit tightly to the inner surface of the steel pipe pile and stably fit to the inner surface of the pipe.
Further, even when the steel pipe pile is not a perfect circle, it is easy to ensure a close fitting correspondingly. Further, since it can be manufactured by a simple press working with a mold, the dimensional accuracy is easily made constant, and the cost can be greatly reduced because it can be manufactured by a simple press working.
In addition, unlike a conventional head lid having a T-shaped cross section, they can be overlapped, so that they have various great advantages that they are not bulky and easy to handle when storing or carrying many pieces.

(A) is the top view seen from the lower surface side at the time of use of the head cover for steel pipe piles of one Example of this invention, (b) is AOA sectional drawing of (b). (A) is a view showing a state where the head cover of FIG. 1 is put on the head of a steel pipe pile (corresponding to the AOA cross-sectional view of (A)), and (B) is an enlarged view of B part of (A). . It is A-A 'sectional drawing of Fig.1 (a). It is a figure explaining the use condition of the above-mentioned head lid at the time of steel pipe pile construction. This figure shows a conventional head cover for steel pipe piles. (A) is a plan view seen from the upper surface side during use, (B) is a front view of (A) (the state where the head cover is put on the steel pipe pile) (C) is a side view of (b).

  Hereinafter, the form for implementing the head cover for steel pipe piles of the present invention is explained with reference to drawings.

The head cover 1 of the present invention is placed on the head of a steel pipe pile 10 placed in the ground as shown in FIG.
This head cover 1 is formed by pressing a steel plate, and as shown in FIGS. 1 to 3, a circular-contour flange 2 having an outer diameter D larger than at least an inner diameter d of the steel pipe pile 10, and its flange It has a substantially triangular cylindrical dent portion 4 which is formed inside the portion 2 and whose corners form a substantially triangular shape in a plan view. The substantially triangular cylindrical dent portion 4 includes a substantially triangular flat bottom plate 4a and a substantially triangular cylindrical wall portion 4b rising from the bottom plate 4a. The arc-shaped corner (arc-shaped corner) is denoted by reference numeral 3.
When the head cover 1 is placed on the head of the steel pipe pile 10 as shown in FIG. 2 (a), the substantially triangular cylindrical dent portion 4 is formed at the three circular arc corners 3 at the steel pipe pile 10. It has a contour size to be press-fitted into the inner surface of the. What was shown with the dashed-two dotted line in FIG. 2 (I) is a figure for demonstrating the shape of the head cover 1 before the press injection to a steel pipe pile, and the substantially triangular cylindrical dent part 4 as shown in FIG. In the state of being press-fitted into the steel pipe pile, the diameter is slightly reduced.
The vertical cross-sectional shape (substantially triangular cylindrical wall portion 4b vertical cross-sectional shape) of the arcuate corner portion 3 in the dent portion 4 is a plane toward the bottom plate 4a side of the dent portion 4 as shown in FIG. It has the inwardly inclined part 4c inclined inwardly. The angle θ of the inwardly inclined portion 4c is about 17 ° in the embodiment. Further, a relief 4d is provided at the bent corner portion between the substantially triangular tube wall portion 4b and the flange portion 2 so that no gap is generated between the upper end surface of the steel pipe pile and the flange portion 2.
In addition, since the said dent part 4 becomes a convex part in FIG. 1 (a) seen from the lower surface side at the time of the use, the convex part was shown by 4 '.
The collar portion 2 refers to a portion other than the dent portion 4 (or convex portion 4 ′) in the head cover 1.

Figure 1 (a) and (b), the diameter D ₁ represents a press fit outside diameter of the steel pipe pile of dents portion 4 of the head cover 1. In this embodiment, the press-fit outer diameter _{D 1,} is a 94mmφ against the inner diameter 93.2mmφ of the steel pipe pile. The outer diameter of the steel pipe pile of an Example is 101.6 mmphi.
The plate thickness t of the head cover 1 of the embodiment is 2 mm, the height h is 10 mm, and the press-fit portion length (depth) m is 4 mm.

In the construction of a structure such as a building, when a steel pipe pile is placed and a concrete foundation such as a concrete foundation is constructed on the steel pipe pile, the periphery of the cast steel pipe pile is excavated and the steel pipe pile is After cutting at a predetermined height, the concrete foundation is constructed. FIG. 4 shows a stage where the periphery of the steel pipe pile 10 is excavated, and the head cover 1 is put on the head of the steel pipe pile 10 at this stage.
Subsequently, for example, crushed stone is laid or discarded, but since the head cover 1 is covered, it is possible to prevent the crushed stone and discarded component from entering the steel pipe pile.

According to the head cover 1 described above, the dent portion 4 fitted into the steel pipe pile has a substantially triangular cylindrical shape in which the three corner portions are substantially arcuate in a plan view. Compared with the conventional pipe head pile 12 that is fitted to the steel pipe pile at two positions on both ends of the rectangular plate 12b, it is fitted at the three arcuate corners 3, so the inner surface of the steel pipe pile 10 It is easy to fit in a very close.
In particular, there are many cases where an actual steel pipe pile is not a perfect circle, but since it is fitted at three arcuate corners 3, a tight fit can be easily ensured even if it is not a perfect circle.
Further, since the fitting is performed at the three arcuate corner portions 3, the fitting state inside the pipe inner surface is stable.
Further, since it can be manufactured by simple press working with a mold, it is easy to make the dimensional accuracy constant as compared with the conventional head cover 12.
In addition, the cost can be greatly reduced because it can be manufactured by simple press working.
Moreover, since it can overlap | superpose unlike what makes a T-shaped cross section, when storing or carrying many pieces, it is not bulky and handling is easy.
As described above, the head cover of the present invention has many advantages compared to the conventional head cover 12.

In addition, the head cover of this invention is applicable to the various cases which drive a steel pipe pile. For example, with or without a drilling blade at the tip of a steel pipe pile, and with or without an upward / downward blade formed by a flange with a cut near the tip of the steel pipe pile, etc. It can be applied to various cases such as when the steel pipe pile front end face is closed with an end face plate and when it is open.
Moreover, although the steel pipe pile of an Example is 101.6 mmphi, it is not limited to the size.

1 head cover 2 collar 3 arc-shaped corner (arc-shaped corner)
4 Indented portion 4a (substantially triangular cylindrical shape) Bottom plate 4b Inclined triangular tubular wall portion 4c Inwardly inclined portion 10 Steel pipe pile d Inner diameter D of steel pipe pile Outer diameter D ₁ (indented portion 4 into steel pipe pile) Outer diameter θ Angle of inwardly inclined portion 4c

Claims (2)

When placing a steel pipe pile in the ground and constructing the foundation of the structure on the steel pipe pile, it is a head cover for a steel pipe pile that covers the head of the placed steel pipe pile,
A steel plate is press-worked, and has a circular contour flange having an outer diameter larger than the inner diameter of at least the steel pipe pile, and three corners formed in an arc shape on the inner side of the flange. A substantially triangular cylindrical dent portion that forms a substantially triangular shape, and the substantially triangular cylindrical dent portion is located at the three arcuate corners when the head cover is placed on the head of the steel pipe pile. A head cover for a steel pipe pile, characterized by having a shape having a contour dimension that is press-fitted into the inner surface of the steel pipe pile. 2. The head portion for steel pipe piles according to claim 1, wherein a longitudinal section of the arc-shaped corner portion of the dent portion has an inwardly inclined portion inclined inward in a plan view toward the bottom plate side of the dent portion. lid.

Images