JP2001254367A - Junction structure between pile and foundation beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a junction between a pile and a foundation beam, and to improve the workability thereof. SOLUTION: In the structure of the junction A between a pile head portion of the pile 1 and a foundation beam 2 of a steel reinforced structure, a steel annular jointing board 4 is arranged at a location of a lower main reinforcement 6 of the foundation beam 2 at the junction A, and the lower main reinforcement 6 of the foundation beam 2 is connected to the annular jointing board 4. Further, an upper end of a pile main reinforcement 7 is anchored to the junction A through a central hole 5 of the annular jointing board 4. Then, a lower end of a column main reinforcement 8 of a steel reinforced column 3 to be connected to the junction A is anchored to the interior of the upper end of the pile main reinforcement 7 anchored to the junction A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation for a building, and more particularly to a structure for rationally joining a pile head of a concrete pile and a reinforced concrete foundation beam.

[0002]

2. Description of the Related Art A foundation in a building is constructed by firmly joining a pile head of a pile, a foundation beam, and a column base of a column, and a large number of large-diameter reinforcing bars are densely arranged at the joint. Since they are streaked and become intricately complicated, a large footing for accommodating the streaks is usually provided at the joint.

[0003]

In the conventional design and construction of a foundation, it is an important issue how to fit the reinforcing bars in the footing and how to perform the construction in a rational and efficient manner. In fact, effective improvement measures are still being sought.

[0004] In view of the above circumstances, an object of the present invention is to provide an effective structure capable of greatly simplifying the structure of a joint between a pile and a foundation beam and improving its workability.

[0005]

According to the first aspect of the present invention, in a joint structure between a pile head of a concrete pile and a reinforced concrete foundation beam, a steel annular joint plate is provided below the foundation beam at the joint. At the position of the main reinforcement, the lower main reinforcement of the foundation beam is joined to the annular joint plate, and the upper end of the pile main reinforcement is fixed to the joint through the center hole of the annular joint plate. .

According to a second aspect of the present invention, in the first aspect of the present invention, a column main reinforcement of a reinforced concrete column to be joined to the joint is fixed inside the pile main reinforcement fixed to the joint. Things.

[0007]

1 and 2 show an embodiment of the present invention. In the drawings, reference numeral 1 denotes a pile (a cast-in-place concrete pile in this embodiment), 2 denotes a reinforced concrete foundation beam, and 3 denotes a foundation beam. It is also a reinforced concrete pillar, and the symbol 4
Are steel annular joint plates provided at the joints A.

[0008] The annular joining plate 4 in the present embodiment is shown in FIG.
As shown in FIG. 5, the plate is a substantially octagonal (square with a cut corner) having a center hole 5, and a steel plate or a cast steel plate can be suitably used as the material. The annular joint plate 4 is arranged at the position of the lower main reinforcement 6 of the foundation beam 2, and the lower main reinforcement 6 is directly joined to the periphery of the lower end of each foundation beam 2 around the joint A. The main bars 6 are connected to each other via the annular joint plate 4 to be structurally integrated. The lower main bar 6 is joined to the annular joint plate 4 by welding, or an appropriate joining means such as screwing a threaded rebar as the lower main bar 6 and screwing it into a cap nut fixed to the annular joint plate 4 can be adopted.

The plurality of pile main reinforcements 7 arranged in a circular shape have their upper ends passed through the center hole 5 of the annular joint plate 4 to reach the joint A, where they are slightly bent outward. And is fixed to the joint A.
The lower ends of the column main bars 8 are arranged inside and fixed to the upper ends of the pile main bars 7.

According to the above structure, the use of the annular joint plate 4 avoids the interference between the pile main reinforcing bar 7 and the lower main reinforcing bar 6 of the foundation beam 2, so that the arrangement of the reinforcing bars at the joint A becomes much easier. That is, conventionally, the lower reinforcement 6 of the foundation beam 2 is usually arranged so as to cross the joint A through the gap of the reinforcement 7, but as shown in FIG. 2, the reinforcement 7 is denser. Although it is not practically easy to pass the lower main bar 6 between them because of the arrangement of the lower main bar 6,
By joining them, such a problem can be solved at once.

[0011] Therefore, the reinforcement at the joint A is very simple and clear, and footing can be substantially omitted. Reinforcement design can be made easier as compared with a conventional general foundation in which large-scale footing is indispensable. Naturally, the workability of the arrangement work can be greatly improved. Further, since the annular joining plate 4 itself is merely a mere steel plate having a center hole 5, it can be manufactured at a low cost, and the joining of the lower main reinforcement 6 to the annular joining plate 4 can be performed by any troublesome work. In addition, the use of this can reduce the amount of rebar, so that it is possible to reduce the cost of foundation work together with the effect of improving workability.

In the above-described embodiment, the upper main reinforcement 9 of the foundation beam 2 is arranged so as to cross the joint A as it is in the conventional manner, and therefore, the intersection between the upper main reinforcement 9 and the column main reinforcement 8 is limited. However, since the column main bar 8 is not densely arranged like the pile main bar 7, interference there is not a problem. Usually, only the lower main bar 6 is annular as in the present embodiment. It is sufficient to provide the joining plate 4. However, in a case where the upper main bar 9 and the column main bar 8 interfere with each other, if necessary, the same annular joint plate 4 is also arranged above the joint A, and the upper main bar 9 is welded thereto. May be joined together.

The above embodiment is an example in which the column 3 is made of reinforced concrete. Therefore, the column main bar 8 is fixed inside the pile main bar 7, but when the column is made of steel frame, the column main bar 8 is fixed. The column base may be inserted into the inside of the main pile 7 as it is and fixed, or may be joined by fastening the base plate provided on the column base to the upper surface of the joint A with an anchor. Further, the pile 1 is not limited to the cast-in-place concrete pile, but may be applied to a precast concrete pile such as a PHC pile as long as the main pile 7 is fixed to the joint A.

Further, the annular joint plate 4 has a central hole 5 at the periphery thereof, to which the lower main bar 6 or the upper main bar 9 of the foundation beam 2 can be joined by welding or the like and the main bar 7 of the pile can be inserted. As long as it is not limited to the octagon or square as in the above embodiment,
For example, it is needless to say that a change such as a circular shape or a cross shape is possible.

[0015]

According to the first aspect of the present invention, the lower main reinforcement of the foundation beam is joined to the annular joint plate and the upper end of the pile main reinforcement is fixed to the joint through the center hole of the annular joint plate. Interference between the lower main reinforcement of the pile and the main reinforcement of the pile can be avoided, so that the reinforcement at the joint is much easier to fit and the footing can be substantially omitted, realizing the reinforcement arrangement design and the reinforcement arrangement work. It is possible to reduce foundation work costs.

According to the second aspect of the present invention, the lower end of the column main bar of the column to be joined to the joint is fixed inside the upper end of the pile main bar fixed to the joint. Can also be effectively avoided.

[Brief description of the drawings]

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

FIG. 2 is a plan sectional view of the same.

[Explanation of symbols]

 A Joint 1 Pile (concrete pile) 2 Foundation beam 3 Column 4 Ring connection plate 5 Center hole 6 Lower main bar of foundation beam 7 Pile main bar 8 Column main bar 9 Upper main bar of foundation beam

Claims (2)

[Claims] In a structure of a joint portion between a pile head of a concrete pile and a reinforced concrete foundation beam, a steel annular joining plate is disposed at a position of a lower main bar of the foundation beam at the joining portion, and the annular joint is provided. A joint structure between a pile and a foundation beam, wherein the lower reinforcement of the foundation beam is joined to the plate, and the upper end of the pile reinforcement is fixed to the joint through the center hole of the annular joint plate. 2. A joint structure between a pile and a foundation beam according to claim 1, wherein a main reinforcement of a reinforced concrete column joined to the joint is provided inside an upper end portion of the main reinforcement of the pile fixed to the joint. A joint structure between a pile and a foundation beam, wherein the lower end is fixed.