JP2000129690A - Integral structure of column base and pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an integral structure of column base and pile which can also be applied to a general hollow pile which has a relatively small diameter and has no projection on its internal surface. SOLUTION: A column base 7 with a base plate 9 is inserted into the upper end portion of a hollow pile 1 to make the base 7 integral to the pile 1 by means of a concrete 8 filled into the pile 1, thereby forming a one-piece construction. And a partition plate 3 provided at a predetermined location within the pile 1 on the upper end side thereof and a plate material 5 provided in the upper end portion of the pile 1 so as to project inwardly are provided so that the shape of the upper end opening of the pile 1 formed by the plate material 5 is made approximately similar to the external form of the base plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an integrated structure of a column base and a pile.

[0002]

2. Description of the Related Art Heretofore, it has generally been common to join a foundation pile and a pillar on the ground by constructing a foundation member made of concrete called footing on the foundation pile and erecting a pillar on the foundation member. . That is, the foundation pile and the column are joined via the footing.

[0003] However, in the case of joining via footing, there is a problem that it takes time and cost,
A simple connection structure between foundation piles and columns was sought. To realize this, for example, Japanese Patent Application Laid-Open No. 3-51
No. 428 discloses an invention of a one-pillar / one-pile foundation structure.

FIGS. 6A and 6B are explanatory diagrams of a one-pillar / one-pile foundation structure portion shown in the publication. FIG. 6A is a plan view and FIG. 6B is a side sectional view. What is disclosed in the same publication is to provide a column-pile joint excellent in structural performance and workability for a building above a middle-high-rise railway, and the concrete configuration is that concrete 50 is filled inside. A pile steel pipe 51 having an inner projection 52 having an inner projection 52 is used as a pile steel pipe of the concrete-filled steel pipe pile obtained, and a column steel frame 54 having a base plate 53 is embedded in the pile steel pipe 51 having an inner projection. Within a certain section from the top of
That is, a band-type reinforcing member 55 and a ring-type reinforcing member 56 are provided.

[0005] The outer diameter of the pile steel pipe 51 with an inner projection is 20
It has a considerably large diameter of about 00 to 2400 mm, and the pile steel pipe diameter / column steel diameter ratio is about 2.5 to 3.0.
The reason for using the pile steel pipe 51 with an inner projection having the projection 52 on the inner surface is to fix the pile steel pipe 51 with the inner projection to the concrete and to function as a concrete composite structure.

[0006]

The prior art described above is
It is intended for heavy structures using large-diameter steel pipe piles with an outer diameter of about 2000 to 2400 mm, and the following problems occur when applied directly to small and medium-sized steel frame structures targeted by the present application. .

[0007] In the case of a lightweight structure, a pillar has a small diameter, and when the pillar has a small diameter, a pile also has a relatively small diameter. The load is relatively small, and the construction takes time. In general, construction without filling concrete is performed, and naturally, there is used one having no protrusion on the inner surface. Also, in reality, a small-diameter steel pipe pile having a diameter of 400 mm or less has not been manufactured with a protrusion on the inner surface. In the case of such a steel pipe pile having no protrusion on the inner surface, (1) it is not possible to integrate the steel pipe simply by casting concrete,
Thus, there is no structure and construction method that can be integrated without any protrusion. Therefore, (2) there is a problem that even if concrete is filled, the stress transmission is incomplete because there are no projections, and particularly when the column is subjected to a tensile force, the column easily comes off.

The ring-type reinforcing member 56 shown in FIG.
May play a role of pressing the concrete filled in the pile steel pipe 51 with the inner surface projection, but it is only an auxiliary one. If the difference between the inside diameter of the steel pipe pile and the outside diameter of the column is not so large, the outside diameter of the base plate (outside the base plate) has little room for the inside diameter of the steel pipe pile. Attachment of the ring-shaped reinforcing member 56 which protrudes to a large extent has a problem that it becomes difficult to insert a pillar.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides an integrated structure of a column base and a pile which can be applied to a general hollow pile having a relatively small diameter and no projection on its inner surface. It is an object.

[0010]

According to the present invention, there is provided an integrated structure of a column base and a pile according to the present invention, wherein a column base having a base plate is inserted into an upper end of a hollow pile to integrate the two with a filled concrete. In the integrated structure of the pile and the pile, a partition plate installed inside a predetermined position on the upper end side of the hollow pile, and a plate material provided to protrude inward at the upper end of the hollow pile,
The shape of the upper end opening of the hollow pile formed by the plate material is substantially similar to the outer shape of the base plate.

When the hollow pile and the column base are arranged so that their axes are aligned with each other, the gap between the base plate and the plate is smaller than the minimum gap between the base plate and the inner surface of the hollow pile before the plate is installed. It is set to be equal to or greater than.

Further, the plate member is constituted by a plurality of divided members.

Further, the plate member is provided with an opening in a single plate.

[0014] The hollow pile may have a round shape, the base plate may have a rectangular shape, and the plate material may have four bow shapes.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a side cross-sectional view of an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along the line BB in FIG. In the figure, reference numeral 1 denotes a round steel pipe pile having a relatively small diameter with no protrusions on its inner surface, and 3 denotes a steel plate welded from the top of the steel pipe pile to a depth of about 2 to 3 times the outer diameter of a column described later. It is a partition plate. Reference numeral 5 denotes a stiffener installed at four places at the upper end of the steel pipe pile 1 so as to project inward from the steel pipe pile 1.
As shown in FIG. 2, it is formed from a bow-shaped plate. 7
Is a rectangular steel pipe column having a lower end inserted into the upper end of the steel pipe pile 1 and joined to the steel pipe pile 1 via concrete 8, 9 is a few cm from the outer shape of the column attached by welding to the lower end of the steel pipe pillar 1 This is a rectangular base plate having a large external shape.

Here, the significance of the stiffener 5 having an arcuate shape will be described. The stiffener 5 prevents the steel pipe column 1 from coming out together with the concrete when the steel pipe column 1 is subjected to tension, and mechanically, as shown in FIG. 1 can be transmitted. Since the stiffener 5 has a function of pressing concrete, the larger the area, the better.

However, when the stiffener 5 is large, the opening area of the upper end of the steel pipe pile 1 is small, and there is a problem that the stiffener 5 comes into contact with the base plate 9 when the steel pipe column 7 is inserted, making it difficult to insert the steel pipe post 7. for that reason,
It is necessary that the concrete can be pressed without making the area of the upper end opening of the steel pipe pile 1 as small as possible. Therefore, in the present embodiment, the stiffener 5 is formed in a bow shape and installed at four places on the upper end surface of the steel pipe pile 1 so that the shape of the opening of the steel pipe pile 1 is substantially similar to the base plate 9. .

By making the shape of the opening of the steel pipe pile 1 substantially similar to the shape of the base plate 9 in this way, for example, the base plate 9 and the opening are made smaller than when the shape of the opening of the steel pipe pile 1 is made circular. Can be enlarged, and the insertion of the steel pipe column 7 becomes easy.

Next, a method of constructing the integrated structure of the steel pipe pile 1 and the steel pipe column 7 configured as described above will be described. Steel pipe pile 1
, The partition plate 3 and the stiffener 5 described above are installed in advance. The steel pipe pile 1 in this state is installed at a predetermined position, the lower portion of the steel pipe column 7 is inserted into the installed steel pipe pile 1, and positioned at an appropriate height from the partition plate 3. Since a gap is provided between the stiffener 5 and the base plate 9, the insertion of the steel pipe column 7 can be performed relatively smoothly. In this state, the space between the column base of the steel pipe column 7 and the steel pipe pile 1 is filled with concrete. At this time, the concrete is dammed by the partition plate 3, and only the upper part of the partition plate 3 is filled with the concrete. For this reason, it is possible to prevent the uneconomical effect of filling concrete for several tens of meters.

In the integrated structure of the steel pipe column 7 and the steel pipe pile 1 configured as described above, the compressive load is transmitted to the steel pipe pile 1 via the concrete 8 and the partition plate 3, and the tensile load is Is transmitted to the steel pipe pile 1 via the concrete 8 and the stiffener 5.

As described above, according to the present embodiment, an integrated structure of a steel pipe pile 1 having a relatively small outer diameter and having no projection inside and a column base can be realized by an extremely simple structure. In addition, the column base can be smoothly inserted into the steel pipe pile 1.

In the above-described embodiment, an example in which four bow-shaped stiffeners are used has been described. However, a ring-shaped integral plate having a central opening substantially similar to the outer shape of the base plate (simple plate) In a word, a hole is made in a disk)
May be. Further, although the steel pipe pile has been described as an example, the present invention is not limited to this, and a hollow pile made of another material may be used.

Embodiment 2 FIG. FIG. 5 is an explanatory diagram for explaining the second embodiment of the present invention, and the same parts as those in the first embodiment are denoted by the same reference numerals. FIG. 5 shows a state where the axes of the steel pipe pile 1 and the steel pipe pile 7 are aligned with each other, and L indicates a gap distance between the corner of the base plate 9 and the inner surface of the steel pipe pile 1 in the same horizontal plane. In the present embodiment, the dimension and shape of the stiffener 5 are set such that the gap distance between the outer edge of the base plate 9 and the stiffener 5 is equal to or less than the above L (set to L in this example).

According to the present embodiment, even when the stiffener 5 is installed, the minimum gap when the stiffener 5 is not installed can be ensured, and the insertion of the column base into the steel pipe pile 1 can be performed more smoothly. It can be carried out.

[0025]

The present invention is configured as described above and has the following effects.

A partition plate installed inside a predetermined position on the upper end side of the hollow pile, and a plate material extending inward from an upper end portion of the hollow pile, the upper end opening of the hollow pile formed by the plate material Since the shape of the portion is substantially similar to the outer shape of the base plate, an extremely simple structure can realize an integrated structure of a hollow pile having a relatively small outer diameter and having no projection inside and a column base. Moreover, the column base can be smoothly inserted into the hollow pile. In addition, it is possible to prevent the uneconomical situation of filling concrete for several tens of meters.

Further, when the hollow pile and the column base are arranged so that their axes are aligned with each other, the gap between the base plate and the plate material is smaller than the minimum gap between the base plate and the inner surface of the hollow pile before the plate material is installed. Since it is set to be approximately the same or more, the insertion of the column base into the hollow pile can be performed more smoothly.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view taken along the line BB in FIG. 1;

FIG. 4 is an explanatory diagram of one embodiment of the present invention.

FIG. 5 is an explanatory diagram of another embodiment of the present invention.

FIG. 6 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 steel pipe pile 3 partition plate 5 stiffener 7 column base 8 concrete 9 base plate

Continued on the front page (72) Inventor Yasuhisa Imamoto 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. F-term (reference) 2D041 AA02 CA01 CB01 CB06 DB02 2D046 AA14

Claims (5)

[Claims] 1. An integrated structure of a column base and a pile, in which a column base having a base plate is inserted into an upper end of a hollow pile and the two are integrated by filling concrete, an interior of a predetermined position on an upper end side of the hollow pile And a plate member provided inwardly projecting from the upper end of the hollow pile, and the shape of the upper end opening of the hollow pile formed by the plate is substantially the same as the outer shape of the base plate. An integrated structure of column base and pile characterized by having a similar shape. 2. A gap between the base plate and the plate material when the hollow pile and the column base are arranged so that their axes are aligned with each other, and a minimum gap between the base plate and the inner surface of the hollow pile before the plate material is installed. 2. The integrated structure of the column base and the pile according to claim 1, wherein the column base and the pile are set so as to be equal to or more than the same. 3. The integrated structure of a column base and a pile according to claim 1, wherein the plate member is constituted by a plurality of divided members. 4. The integrated structure according to claim 1, wherein the plate member has a single plate provided with an opening. 5. The integrated structure according to claim 1, wherein the hollow pile has a round shape, the base plate has a rectangular shape, and the plate material has a shape of four bows.