JPH0610361A - Pedestal construction method - Google Patents

Abstract

PURPOSE:To reduce term of construction and enhance workability. CONSTITUTION:In terms of construction method for a pedestal foundation of a building under steel structure, a foundation steel pipe 3 is fixedly installed to foundation concrete 2 placed at a predetermined construction site of the building. Anchor bolts 4 are set into the foundation steel pipe 3 so as to support a steel column 5 where concrete 42 is cast into the foundation steel pipe 3, thereby building up the pedestal foundation 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base construction method used for the foundation of a steel frame structure.

[0002]

2. Description of the Related Art The foundation of a conventional steel frame structure has generally been constructed by a reinforced concrete structure as shown in FIG. In the conventional procedure of the column base construction method, reinforcing bars such as the main reinforcing bar A and the reinforcing bar B are arranged on the foundation concrete, and the joining members such as the anchor bolts C are arranged inside the reinforcing bar. Next, the form D is installed on the bar arrangement, the concrete E is placed in the form D, and the form is removed after the concrete is hardened to build the column base. It was And steel pillar F
Was erected on the pedestal foundation.

[0003]

Problems to be Solved by the Invention The above-described conventional column base foundation made of reinforced concrete has the following problems. <a> In order to construct a column base, many processes such as root cutting, bar arrangement, formwork installation, concrete placement, and formwork demolding must be performed, which is one of the reasons for the prolonged construction period. ing.

<B> When the column base having the steel frame structure is used as the exposed column base, the column base has a size considerably larger than the column material, and the appearance of the column base after construction is impaired.

<C> When the column base is a reinforced concrete structure, the foundation beam is limited to a reinforced concrete structure, and a steel frame structure cannot be adopted for the foundation beam.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a column base construction method capable of shortening the construction period and improving the workability.

[0007]

[Means for Solving the Problems] That is, according to the present invention, in a method of constructing a column pedestal foundation of a building with a steel structure, a foundation steel pipe is fixed on a foundation concrete cast at a construction site of the building, A column base construction method, characterized in that an anchor bolt for supporting a steel frame column is set in the basic steel pipe, and concrete is placed in the basic steel pipe to construct a column base. Further, the present invention, in the construction method of the column base foundation of the building by the steel frame structure, the reinforcement is done on the foundation concrete placed in the planned construction site of the building, and the stud dowel is provided on the side surface in the reinforcement. Arrange the protruding basic steel pipe, cover the formwork on the rebar, place concrete in the formwork, and after the concrete hardens, set anchor bolts for supporting steel columns in the basic steel pipe. The column base construction method is characterized in that concrete is placed in the foundation steel pipe to construct a column base.

[0008]

First Embodiment A column base construction method will be described below with reference to the drawings. <A> Placing basic concrete (Fig. 4) Excavate the planned construction site of the building foundation to the specified depth. Foundation concrete 2 is placed in the excavated hole. At that time, the stercon anchor 21 is installed in the vertical direction. The stacon anchor 21 is installed at a position where a part of the stacon anchor 21 projects from the basic concrete 2. In addition, a foundation pile or the like may be placed below the foundation concrete 2 if necessary.

<B> Installation of basic steel pipe (FIGS. 2 and 4) After level mortar 22 is placed on the basic concrete 2 and the height of the basic steel pipe 3 is adjusted, the basic steel pipe 3 is mounted. Place. That is, the holes 3 of the base plate 32
The stecon anchor 21 is passed through the base plate 4, and the base plate 32 is fastened with a nut to fix the base steel pipe 3 on the base concrete 2. As shown in FIG. 2, the basic steel pipe 3 is
A hollow body having a rectangular cross section and one end opened, and a plate-shaped base plate 32 formed in a rectangle larger than the cross section of the hollow body is formed at one closed end of the hollow body. The cross-sectional dimension of the body portion 33 of the basic steel pipe 3 is selected to be slightly larger than the dimension of the base plate 51 formed in the lower portion of the steel frame column 5 described later. The base plate 32 has a plurality of holes 34 formed therein. The hole diameter of the hole 33 is set according to the diameter of the stencon anchor 21 penetrating the hole 34. With respect to the installation of the stacon anchor 21, it is also possible that after the concrete 2 is cast, an anchor hole is drilled in the basic concrete 2 and the stacon anchor 21 is inserted and fixed in the anchor hole.

<C> Concrete Placing in the Basic Steel Pipe (FIG. 4) The anchor bolts 4 are positioned in the basic steel pipe 3 and are temporarily installed in the vertical direction. The anchor bolts 4 are temporarily installed at the holes 5 of the steel column 5 in consideration of the installation position of the steel column 5.
Decide to fit 2. Then, concrete 42 is placed in the base steel pipe 3. At this time, the concrete 42 is not filled up to the upper end of the opening 35 of the basic steel pipe 3, but a gap is provided to some extent. After the concrete 42 is hardened, the level mortar 41 is placed on the concrete 42 to position the steel frame column 5 to be joined in the vertical direction.

<D> Joining of Basic Steel Pipe and Foundation Beam (FIG. 4) The basic beam 6 is welded to the side surface portion 31 of the basic steel pipe 3 for joining. Since the steel beams such as H steel can be used as the foundation beams 6, the work such as bar arrangement, formwork installation and concrete placement is unnecessary, so that the construction period of the foundation beams 6 can be shortened. Moreover, since the weight can be reduced by constructing the entire foundation portion with a steel frame structure, the foundation pile 7 can be omitted.

<E> Joining of Basic Steel Pipe and Steel Column (FIGS. 3 and 4) Backfilling is performed to embed the foundation part. Next, regarding the joining of the basic steel pipe 3 and the steel frame column 5, the steel frame column 5 will be described.
The steel frame column 5 is a column that constitutes a framework of a building, and is formed of, for example, a rectangular column-shaped hollow body, and a base plate 51 is formed at the end thereof similarly to the basic steel pipe 3.
The base plate 51 has a plurality of holes 52. The hole diameter of the hole 52 is set according to the diameter of the anchor bolt 41 penetrating the hole 52. The process of joining the basic steel pipe 3 and the steel column 5 will be described. The anchor bolt 4 protruding from the concrete 42 in the base steel pipe 3 is passed through the hole 52 formed in the base plate 51, and the steel frame column 5 is built on the base steel pipe 3. A nut is attached to the anchor bolt 41 and the base plate 51 is fastened. Then, the grout material is injected into the gap between the concrete 42 and the base plate 51. At this time, since the body portion 33 of the basic steel pipe 3 surrounds the periphery of the base plate 51, it is possible to inject the grout material without requiring a separate seal form.

<F> Steel frame erection As described above, the steel frame columns 5 are successively erected and the steel frame is erected.

[0014]

[Second Embodiment] As shown in FIG. 5, the column base of the present embodiment is
The foundation steel pipe 3a is constructed by being exposed from the foundation beam 61, and the foundation beam 61 is constructed by a reinforced concrete structure. In the column base construction process, first, reinforcement is arranged on the foundation concrete 2 placed in the planned construction site of the building, and the foundation steel pipe 3a is arranged in the reinforcement. As the basic steel pipe 3a, one having a stud dowel 36 projecting from the outer surface is used. Then, the form is exteriorly mounted on the reinforced reinforcing bar, and concrete 7 is placed in the form. After concrete 7 hardens, foundation steel pipe 3a
An anchor bolt 4 for supporting a steel column 5 is set inside, and concrete 42 is placed in the foundation steel pipe 3a to construct a column base. The plurality of stat dowels 36 installed on the outer surface of the base steel pipe 3a enhance the bondability with the concrete 7. As described above, the column base construction method of the present invention can be applied to a foundation beam having a reinforced concrete structure.

[0015]

Since the present invention is as described above, the following effects can be obtained. <A> Since the column base is made of a steel structure, there is no need to install reinforcements and formwork at the time of construction.

<B> Since the column base and the foundation beam made of steel can be easily joined, the entire foundation can be constructed with a steel structure, and each member can be prefabricated.

<C> It is possible to greatly reduce the construction period of the foundation portion.

<D> The column base can be formed thinner than the conventional reinforced concrete structure. For this reason, the state of alignment with the steel aggregate to be joined to the column base is good, and excellent appearance can be imparted when, for example, construction is performed with the column base exposed.

<E> By filling the basic steel pipe with concrete, the effect of restraining the concrete is obtained, and by constructing the steel column on the concrete, the compressive strength of the concrete is increased.

<F> Since the basic steel pipe functions as a reinforcing member, the rigidity of the column base is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a column base according to a first embodiment.

[Fig. 2] Perspective view of basic steel pipe

FIG. 3 is an explanatory diagram of a method of joining a column base and a steel column.

FIG. 4 is a cross-sectional view of the base portion of the first embodiment.

FIG. 5 is a cross-sectional view of the base portion of the second embodiment.

FIG. 6 is an explanatory diagram of a conventional column base.

Claims (2)

[Claims] 1. A method for constructing a column base foundation for a building having a steel structure, in which a base steel pipe is fixed on a foundation concrete placed in a planned construction site of the building, and an anchor for supporting the steel column is provided in the base steel pipe. A column base construction method, characterized in that a column base is constructed by setting bolts and placing concrete in the foundation steel pipe. 2. A method of constructing a column base foundation for a building using a steel frame structure, wherein reinforcement is laid on the foundation concrete placed in the planned construction site of the building, and stud dowels are provided on the sides within the reinforcement. Arrange the projecting basic steel pipe, cover the formwork on the rebar, place concrete in the formwork, and after the concrete has hardened, set anchor bolts for supporting steel columns in the basic steel pipe. The column base construction method, characterized in that concrete is placed in the foundation steel pipe to construct a column base.