JPH08218395A - Joint structure of pile-column foundation - Google Patents

Abstract

PURPOSE: To enhance joint strength by disposing a column leg in a steel pipe pile and casting fiber reinforced concrete in the steel pipe pile to connect the steel pipe pile and the column leg. CONSTITUTION: A steel pipe pile 1 with a protrusion is driven into the ground. Next, ordinary concrete 3 is cast into the pile 1 and cured. And a column leg 2 is inserted into the pile 1. Further, fiber reinforced concrete is placed between the pile 1 and the leg 2 and cured. As a result, since the pile 1 is connected with the leg 2 by casting the fiber reinforced concrete, sufficient shearing strength can be provided in the joining between the pile 1 and leg 2 without using reinforcing bars, as required in a conventional method. And an arranging work of reinforcing bars is not required and a column can be easily inserted and set, and hence joining between pile and column foundation can be achieved at high efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile-column foundation joint structure for connecting a steel pipe pile and a column base by placing a column base inside a steel pipe pile and placing concrete.

[0002]

2. Description of the Related Art Conventionally, as one method of constructing a foundation for a pillar on soft ground, after driving a steel pipe pile into a deep support ground that can support an overlaid load, the pillar base of the pillar is placed inside the steel pipe pile. Steel pipe piles and pillars are connected by inserting and installing concrete and solidifying it.

FIG. 3 is a longitudinal sectional view of the foundation constructed by the above method, and FIG. 4 is a transverse sectional view of the foundation. The steel pipe pile 1 is provided with protrusions such as ribs in order to improve fixation with concrete. The column base 2 of the column is inserted into the steel pipe pile 1. Ordinary concrete 3 is placed between the steel pipe pile 1 and the column base 2, and the steel pipe pile 1 and the column base 2 are joined by solidification of the concrete 3.

This ordinary concrete has a high strength against a compressive force, but is weak against a tensile force. Therefore, in order to enhance the strength of the joint portion, the reinforcing bar 5 is provided with the steel pipe pile 1 and the column base portion 2. It is common practice to arrange the muscles during the period.

[0005]

However, the above-mentioned joining structure of the steel pipe pile and the column base has the following problems. (1) When reinforcing steel bars are reinforced inside a steel pipe pile, the steel pipe pile is narrow, so it takes a lot of time to arrange the reinforcement, and conducting reinforcement work is a factor that prolongs the construction period of the foundation. ing. (2) Even when the pillar body is inserted and installed after the reinforcing reinforcing bars are arranged, the inside of the reinforcing bar is narrow and it takes time and effort to insert and install the pillar. (3) Since it takes manpower to perform each of the above work,
There are also problems in terms of costs such as personnel expenses. An object of the present invention is to solve the above-mentioned problems of the prior art, a high joint strength, a joint structure of a steel pipe pile and a column base portion that does not require rebar work and does not require extra labor cost. To provide.

[0006]

According to the present invention, in a pile-column foundation joint structure in which a steel pipe pile and a column base portion installed inside the steel pipe pile are connected by placing concrete, the concrete is made of fiber concrete. To set.

As the fiber concrete, commercially available steel fiber concrete, carbon steel concrete or the like can be appropriately selected and used. However, in a basic structure using steel pipe piles, in order to prevent the corrosion of the steel pipe piles, Preference is given to using steel fiber concrete.

[0008]

[Function] Since the fiber concrete has a large strength not only against the compressive force but also against the tensile force, the joint strength between the steel pipe pile and the column body is sufficiently secured and the reinforcing steel bar is not necessary.

[0009]

1 is a longitudinal sectional view of a pile-column foundation using the joint structure of the present invention, and FIG. 4 is a transverse sectional view of the foundation. Reference numeral 1 indicates a steel pipe pile with protrusions such as ribs, and reference numeral 2
Indicates a column base, reference numeral 3 indicates ordinary concrete, and reference numeral 4 indicates fiber concrete. A column base 2 is inserted and installed inside the steel pipe pile 1.

In this embodiment, the fiber concrete 4 is cast and fixed only around the column bases 2 arranged in the steel pipe piles 1, and only the steel pipe piles 1 below the column bases 2 are cast. Normal concrete 3 is placed on the foundation part.

The range in which the fiber concrete 4 is cast to solidify the column bases 2 is not limited to the example shown in FIGS. 1 and 2, and the range can be changed as necessary. . For example, when it is desired to keep the reinforcing strength high, the fiber concrete 4 may be placed below the column base 2.

In this embodiment, the method of joining the steel pipe pile and the column base is as follows. First, after a foundation is formed by driving a steel pipe pile, ordinary concrete 3 is poured into the steel pipe pile 1 and solidified. The placement of this ordinary concrete is
It is performed while leaving the portion required for the insertion of the column base 2. next,
The column base portion 2 is inserted into the steel pipe pile 1, and the fiber concrete 4 is placed between the steel pipe pile 1 and the column base portion 2 and solidified.

[0013]

As described above, in the pile-column foundation joint structure of the present invention, since the steel pipe pile and the column base are connected by the placement of the fiber concrete, it is not necessary to use the reinforcing bar as in the conventional case. It is possible to join steel pipe piles with sufficiently large strength (shear strength) and column bases. Therefore, the conventional work for reinforcing bars is not required, and the work for inserting and installing the pillars is facilitated, and the construction efficiency of joining the pile-column foundation structure is significantly improved.

In addition, since the reinforcing bar is not reinforced, the space for the reinforcing bar is not required, the diameter of the steel pipe pile is small, the amount of concrete consumed can be reduced, and the labor cost can be reduced. In addition, the construction cost of the foundation can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a pile-column foundation joint structure of the present invention.

2 is a cross-sectional view of the joint structure of FIG.

FIG. 3 is a vertical cross-sectional view of a conventional pile-column foundation joint structure.

4 is a cross-sectional view of the joint structure of FIG.

[Explanation of symbols] 1 Steel pipe pile 2 Column base 3 Normal concrete 4 Fiber concrete 5 Reinforcing bar

Claims (1)

[Claims] 1. In a pile-column foundation joint structure in which a steel pipe pile and a column base portion installed therein are connected by placing concrete, the concrete is placed by fiber concrete. -Joint structure of pillar foundation.