JP3231376U - Pile head cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile head cap having a novel structure which can be easily attached to a steel pipe pile and can suppress rattling when attached. A pile head cap 1 includes a lid plate 2 that closes an end opening 6 of a steel pipe pile 5, and a plurality of leg portions 10 that elastically abut on an inner peripheral surface 7 of the steel pipe pile 5. There is. The leg portion 10 includes a base end portion 12 joined to the lid plate 2, a contact portion 16 located on the outer edge side of the lid plate 2 with respect to the base end portion 12 and in contact with the inner peripheral surface 7 of the steel pipe pile 5. The leg portion 10 includes a spring portion 14 that connects the base end portion 12 and the abutting portion 16 to support the abutting portion 16, and a tip portion 18 that shifts to the center side of the lid plate 2 toward the tip side. As a whole, it has a shape that bulges toward the outer edge side of the lid plate 2. [Selection diagram] Fig. 2

Description

The present invention relates to a pile head cap attached to an end opening of a steel pipe pile.

A pile head cap may be attached to the end opening of a steel pipe pile made of a hollow cylinder driven into the ground for ground improvement. This is because by attaching the pile head cap, it is possible to prevent the upper end of the steel pipe pile from being deformed, and it is possible to prevent foreign matter such as earth and sand and rainwater from entering the inside.

For example, as a pile head cap (cover) that can be attached to and detached from the end opening of a steel pipe pile, there is one described in Patent Document 1 below. The pile head cap described in Patent Document 1 includes a top plate that covers the entire upper surface of the steel pipe pile and a locking portion that hangs down from the lower surface of the top plate, and is locked to the inner peripheral surface of the steel pipe pile. By elastically contacting the portions, the pile head cap is held against the opening at the end of the steel pipe pile (see FIG. 3).

Japanese Unexamined Patent Publication No. 2004-52240

However, in the pile head cap of Patent Document 1, since the locking portion hanging from the lower surface of the top plate is straight as a whole and only a part of the locking portion is bent, the shape of the locking portion is formed. If the position varies, there is a concern that the workability of mounting on the steel pipe pile will deteriorate and that rattling will occur when mounting on the steel pipe pile.

In view of the above circumstances, it is an object of the present invention to provide a pile head cap having a novel structure that can be easily attached to a steel pipe pile and can suppress rattling when attached.

As a result of diligent studies to solve the above problems, the present inventors came up with the present invention as follows.
The present invention is a pile head cap attached to the end opening of a steel pipe pile made of a hollow tubular body.
A lid plate that closes the end opening of the steel pipe pile and
A plurality of legs that elastically abut on the inner peripheral surface of the steel pipe pile are provided.
The legs
The base end portion joined to the lid plate and
A contact portion located on the outer edge side of the lid plate with respect to the base end portion and in contact with the inner peripheral surface of the steel pipe pile.
A spring portion that connects these base end portions and the abutting portion to support the abutting portion, and a spring portion.
A tip portion that is on the tip end side of the contact portion and that shifts to the center side of the lid plate toward the tip end side, and a tip portion.
The legs have a shape that bulges toward the outer edge side of the lid plate as a whole.

According to the pile head cap of the present invention defined in this way, the legs as a whole have a shape bulging toward the outer edge side of the lid plate, and the tip portion thereof has shifted to the center side of the lid plate. Even if the shape and position of the legs are slightly different, the legs can be easily inserted into the hollow of the steel pipe pile by the guidance of the tip. After the leg is inserted into the hollow of the steel pipe pile, the contact portion of the leg is due to the restoring force based on the elastic deformation of the spring portion extending to the outer edge side of the lid plate (that is, the radial outside of the steel pipe pile). Elastically abuts on the inner peripheral surface of the steel pipe pile, so that rattling between the steel pipe pile and the steel pipe pile can be suppressed.

In the present invention, it is possible that the contact portion is provided with a straight portion extending along the pipe axis direction of the steel pipe pile in a state where the pile head cap is attached to the steel pipe pile. In this way, the contact portion of the leg portion can come into contact with the steel pipe pile within the length of the straight portion in the pipe axis direction, and the rattling between the leg portion and the steel pipe pile can be suppressed and the pile head cap for the steel pipe pile can be suppressed. Can increase the holding power of.

Here, in the present invention, the leg portion extends along the joint surface of the lid plate, the first straight line portion forming the base end portion, the second straight line portion forming the spring portion, and the present invention. The third straight line portion constituting the tangent portion may be connected via the bent portion.

Further, in the present invention, the leg portion is formed in an arc shape including a straight portion extending along the joint surface of the lid plate and forming the base end portion, the spring portion, the contact portion, and the tip portion. It can be configured to include a curved shaped portion.

FIG. 1 (A) is a bottom view of the pile head cap according to the first embodiment of the present invention, and FIG. 1 (B) is a cross-sectional view taken along the line BB in FIG. 1 (A). FIG. 2 is a cross-sectional view showing the pile head cap of FIG. 1 together with the steel pipe pile to be mounted. FIG. 3 is a cross-sectional view of the pile head cap of FIG. 1 attached to the steel pipe pile. FIG. 4 is a diagram showing a main part of the pile head cap according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view of the pile head cap of FIG. 4 attached to the steel pipe pile.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 (A) is a bottom view of the pile head cap according to the first embodiment of the present invention, and FIG. 1 (B) is a cross-sectional view taken along the line BB in FIG. 1 (A). In the following description, as shown in FIG. 3, the upper and lower parts when the pile head cap 1 is actually attached to the upper opening of the steel pipe pile are referred to as the upper and lower parts of the pile head cap.

In FIG. 1 (A), reference numeral 1 denotes a pile head cap attached to an end opening of a steel pipe pile. The pile head cap 1 includes a lid plate 2 and a plurality of (three in this example) leg portions 10 joined to the lower surface 2a of the lid plate 2.

The lid plate 2 has a circular plate shape in a plan view and closes the end opening of the steel pipe pile. In this example, as shown in FIG. 3, the outer diameter of the lid plate 2 is the same as the outer diameter of the steel pipe pile 5 in a state where the pile head cap 1 is actually attached to the end opening 6 of the steel pipe pile 5 ( It is also possible to increase the outer diameter of the lid plate 2 so that the outer edge of the lid plate 2 projects slightly outward while the steel pipe pile 5 is attached to the end opening 6). The lid plate 2 can be manufactured by using, for example, a steel plate having a plate thickness of about 3 mm to 4 mm.

The leg portion 10 is made of a rod-shaped member that is separate from the lid plate 2, and has a convex shape that bulges toward the outer edge side of the lid plate 2 as a whole in a side view as shown in FIG. 1 (B). Examples of the rod-shaped member used as the leg portion 10 include round steel having a diameter of about 1.5 mm to 3 mm. The leg portion 10 of this example is formed by locally bending a part of a rod-shaped member extending in a straight line, and includes a first straight line portion 11a constituting a base end portion 12 and a spring portion 14. The second straight line portion 11b that constitutes, the third straight line portion 11c that constitutes the contact portion 16, and the fourth straight line portion 11d that constitutes the tip portion 18 are connected via the bent portion 15. Here, the straight line portion is a portion where the central axis extends linearly over a predetermined length. The leg portion 10 can be made of a different material from the lid plate 2 as long as it is made of a material having spring elasticity. By forming the leg portion 10 into a rod shape or a thin plate shape, the leg portion 10 is brought into close contact with the inside of the steel pipe pile 5 to prevent rattling.

The base end portion 12 is configured to include a first straight line portion 11a extending linearly along the lower surface 2a of the lid plate 2, and is joined to the lower surface 2a of the lid plate 2 by a welded portion 13.

The spring portion 14 is a portion that connects the base end portion 12 and the contact portion 16 to support the contact portion 16, and becomes the outer edge side of the lid plate 2 as the distance from the base end portion 12 increases (in the lower left direction in the drawing). It is extending. The spring portion 14 of this example is configured to include a second straight portion 11b and bent portions 15 at both ends thereof.

The contact portion 16 is located on the outer edge side of the lid plate 2 with respect to the base end portion 12 and the spring portion 14, and is a portion that contacts the inner peripheral surface 7 (see FIG. 3) of the steel pipe pile 5. The pile head cap 1 is attached to the steel pipe pile 5, and is composed of a third straight portion 11c extending along the pipe axis direction (vertical direction in the drawing) of the steel pipe pile 5.

The tip portion 18 is a portion of the contact portion 16 further on the tip end side, and is composed of a fourth straight line portion 11d extending in a direction of shifting toward the center side of the lid plate 2 toward the tip end side.

As shown in FIG. 1A, the three leg portions 10 have a base end portion 12 radially inside and a contact portion 16 radially outside at intervals of 120 ° around the central axis of the lid plate 2. They are arranged in a radial pattern. In these legs 10, the outward surface of the contact portion 16 is a virtual circle 7'(2 points in the figure) corresponding to the inner peripheral surface of the steel pipe pile virtually drawn with the center O of the lid plate 2 as the center. It is located outside the chain line circle).

When the pile head cap 1 configured in this way is pushed downward into the end opening 6 of the steel pipe pile 5 from the state of facing the end opening 6 of the steel pipe pile 5 shown in FIG. 2, it hits the peripheral edge of the opening 6. Each leg portion 10 (mainly, the splash portion 14) is elastically deformed in the radial direction by being guided by the contacting tip portion 18, and is housed in the hollow of the steel pipe pile 5. Then, as shown in FIG. 3, the contact portion 16 elastically contacts the inner peripheral surface 7 of the steel pipe pile 5 based on the restoring force generated by the spring portion 14 of the leg portion 10, and the pile head cap 1 is a steel pipe. It is held in the end opening 6 of the pile 5.

After the pile head cap 1 is attached in this way, it is possible to prevent foreign matter from entering the steel pipe pile 5, and it is possible to protect the upper end portion of the steel pipe pile 5 from pressurization and impact. When the protection by the pile head cap 1 is no longer necessary, the pile head cap 1 can be removed from the upper end of the steel pipe pile 5 by pulling it upward.

As described above, according to the pile head cap 1 of the present embodiment, the leg portion 10 has a shape bulging toward the outer edge side of the lid plate 2 as a whole, and the tip portion 18 thereof shifts to the center side of the lid plate 2. Therefore, even if the shape and position of the leg portion 10 are slightly different, the leg portion 10 can be easily inserted into the hollow of the steel pipe pile by the guidance of the tip portion 18. After the leg portion 10 is inserted into the hollow of the steel pipe pile 5, the leg portion 10 is restored by the elastic deformation of the spring portion 14 extending to the outer edge side of the lid plate 2 (that is, the radial outer side of the steel pipe pile 5). Since the abutting portion 16 of the portion 10 elastically abuts on the inner peripheral surface 7 of the steel pipe pile 5, rattling between the abutting portion 16 and the steel pipe pile 5 can be suppressed.

Further, in the pile head cap 1 of the present embodiment, the contact portion 16 includes a straight portion 11c extending along the pipe axis direction of the steel pipe pile 5 in a state where the pile head cap 1 is mounted on the steel pipe pile 5. , The contact portion 16 of the leg portion 10 can come into contact with the steel pipe pile 5 in the pipe axis direction within the length of the straight portion 11c, and the rattling between the leg portion 10 and the steel pipe pile 5 is suppressed and the pile head with respect to the steel pipe pile 5 is suppressed. The holding power of the cap 1 can be increased.

<Second Embodiment>
FIG. 4 shows a main part of the pile head cap according to the second embodiment of the present invention.
The pile head cap 1B in the figure includes a lid plate 2 that closes the end opening 6 of the steel pipe pile 5, and a plurality of (three in this example) leg portions 10B joined to the lower surface 2a of the lid plate 2. ing. Of these configuration parts, the configuration common to the configuration of the pile head cap 1 according to the first embodiment is shown using the same reference numerals, and the description thereof will be omitted.

The shape of the legs of the pile head cap 1B is different from that of the pile head cap 1. As shown in FIG. 4, the leg portion 10B of this example includes a first straight portion 11a constituting the base end portion 12 and a curved shape portion 40 following the base end portion 12, and bulges toward the outer edge side of the lid plate 2 as a whole. It has a convex shape.
The curved shape portion 40 is formed in an arc shape including the spring portion 14, the contact portion 16, and the tip portion 18. Here, as the arc shape, an arc having a single curvature or a composite arc in which arcs having a plurality of curvatures are combined can be exemplified.

Even in the pile head cap 1B configured in this way, when pushed into the end opening 6 of the steel pipe pile 5, each leg 10 is guided by the tip 18 of the leg 10 in contact with the peripheral edge of the opening 6. It is housed in the hollow of the steel pipe pile 5 in a state of being elastically deformed (mainly, the splash portion 14) in the radial direction. Then, as shown in FIG. 5, the contact portion 16 elastically contacts the inner peripheral surface 7 of the steel pipe pile 5 based on the restoring force generated by the spring portion 14 of the leg portion 10, and the pile head cap 1B is a steel pipe. It is held in the end opening 6 of the pile 5.

<Other modifications / applications>
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these explanations. Various modifications are also included in the present invention to the extent that those skilled in the art can easily conceive without departing from the description of the claims.
(1) For example, in the pile head cap of the present invention, the lid plate and / or the leg may be made of resin.
(2) In the above embodiment, the pile head cap provided with three legs has been described, but the number of legs may be two or four or more.
(3) In the above embodiment, the cap to be attached to the cylindrical steel pipe pile has been described, but the pile head cap of the present invention can also be applied to a square steel pipe pile having a square cylinder shape. In that case, it is desirable that the lid plate has a square shape and each leg portion is arranged on the inner corner side of each corner portion of the lid plate.

1,1B Pile head cap 2 Lid plate 2a Bottom surface (joint surface)
5 Steel pipe pile 6 End opening 7 Inner peripheral surface 10,10B Leg 11a First straight part 11b Second straight part 11c Third straight part 12 Base end 14 Spring part 15 Bending part 16 Contact part 18 Tip Part 40 Curved shape part

Claims (5)

A pile head cap attached to the end opening of a steel pipe pile made of a hollow cylinder.
A lid plate that closes the end opening of the steel pipe pile and
A plurality of legs that elastically abut on the inner peripheral surface of the steel pipe pile are provided.
The legs
The base end portion joined to the lid plate and
A contact portion located on the outer edge side of the lid plate with respect to the base end portion and in contact with the inner peripheral surface of the steel pipe pile.
A spring portion that connects these base end portions and the abutting portion to support the abutting portion, and a spring portion.
A tip portion that is on the tip end side of the contact portion and that shifts to the center side of the lid plate toward the tip end side, and a tip portion.
A pile head cap having a shape in which the leg portion bulges toward the outer edge side of the lid plate as a whole. The pile head cap according to claim 1, wherein the contact portion includes a straight portion extending along the pipe axis direction of the steel pipe pile with the pile head cap attached to the steel pipe pile. The leg portion extends along the joint surface of the lid plate and constitutes the first straight portion portion forming the base end portion, the second straight line portion forming the spring portion, and the contact portion. The pile head cap according to claim 2, wherein the straight portion of 3 is connected via a bent portion. The leg portion includes a straight portion extending along the joint surface of the lid plate and forming the base end portion, and a straight portion.
The pile head cap according to claim 1, further comprising the spring portion, the contact portion, and a curved portion formed in an arc shape including the tip portion. The pile head cap according to any one of claims 1 to 4, wherein the leg portion has a rod shape or a thin plate shape.

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