JPH11229398A - Foundation using steel footing bean and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure which guarantees the junction between a steel column and the foundation of a one-way rigid-frame steel structure by simplifying operations at a construction site and to provide a method for constructing the same. SOLUTION: A blinding concrete 16 is constructed on a dug ground 17, and a footing beam locking jig 8 is installed thereon. The reinforcement 7 of a footing slab 6 is constructed. A footing beam 2 extending in the direction of a rigid frame is installed on the footing beam locking jig 8. A footing beam (4) extending in a ridge direction is connected to the footing beam 2 extending in the direction of the rigid frame, in such a way that the beams 2, (4) are arranged in a double cross. A split tee 3 is mounted on the upper surface of the footing beam 2 extending in the direction of the rigid frame. Cover concrete on the outsides of the footing beams 2, (4) on the outer periphery of the building and the concrete of the footing slab 6 are placed at the same time to integrate the footing beams 2, (4) and the footing slab 6 into a composite structure. After the concrete has cured, a steel column 1 is joined to the split tee 3 by a high strength bolt, etc.

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 unidirectional rigid-framed steel frame structure of a building and a method of constructing the same.

[0002]

2. Description of the Related Art Conventionally, the foundation of a unidirectional rigid frame steel structure of a building is shown in FIG.

[0003] The basic structure shown in Fig. 4 is one in which a column base is exposed. In such a foundation structure, it is general that the lower part from the foundation beam 2 is made of reinforced concrete.

[0004] That is, the foundation slab, the foundation beam 2 and the column type 11 are constructed of reinforced concrete, the anchor bolt 10 is embedded in the column type 11, and the foundation and the steel column 1 are connected using the anchor bolt 10. I have.

[0005]

In the foundation structure shown in FIG. 4, the foundation beam 2, the column-shaped reinforcing bars 12 and the formwork are manufactured and manufactured.
There is a problem that high technology is required for the construction, and the construction period for assembling on site becomes long.

In addition, the foundation and the steel column 1 are anchor bolts 1
Since the connection is made by using 0, it takes time and effort to accurately install the anchor bolts 10, and there is a problem that it becomes a joint between different structures of steel and concrete, which is a structural weak point.

An object of the present invention is to solve the above-mentioned problems, and to provide a foundation structure in which work on a construction site is simplified and a joint between a steel column and a foundation is surely provided, and a method of constructing the foundation. It is an object.

[0008]

According to a first aspect of the present invention, there is provided a foundation using a steel foundation beam according to the first aspect of the present invention. A plurality of foundation beams in the girder direction were connected, and these were integrated with a reinforced concrete foundation slab under the foundation beams via shear connectors, and a steel column was joined to the top of the foundation beams in the frame direction. It is characterized by the following.

[0009] By using steel as the foundation beam, it is possible to eliminate the time required for the construction of the foundation beam, the column-shaped rebar and the formwork, and to ensure the connection with the steel frame column. Further, since the foundation beam and the foundation slab have a composite structure via the shear connector, the formation of the steel frame of the foundation beam can be reduced, and the foundation bottom can be made shallow.

Conventionally, various types of shear connectors have been known in addition to studs with heads, as long as the purpose is to integrate a foundation beam and a reinforced concrete foundation slab as a composite structure, Others are not particularly limited.

The connection between the foundation beam and the steel column in the direction of the rigid frame is made by high-strength bolting using a split tee or the like, or a short column is directly attached to the upper flange of the foundation beam by welding at a factory or the like. The joining method and the presence or absence of the joining metal fitting are not particularly limited.

In many cases, the foundation beam in the girder direction may have a smaller cross-sectional composition than the foundation beam in the rigid frame direction, and may be a channel steel or other shaped steel. Claim 2 limits the case where the foundation beam in the girder direction is an H-section steel or a channel steel. Further, when an H-shaped steel is used, a steel having a smaller cross section than the H-shaped steel used for the foundation beam in the frame direction may be used.

Further, in the foundation according to claims 1 and 2,
In some cases, the shear beam is not necessarily required for the foundation beam in the girder direction. However, claim 3 is the foundation according to claim 2, which is made of H-section steel or channel steel. Also, the case where the shear connector is provided is limited. In the case of a foundation beam without a flange which is not included in claim 2, a shear connector may be provided on the lower surface of the foundation beam.

Basically, by providing the shear connector also on the foundation beam in the girder direction, a foundation structure with higher rigidity and strength can be obtained.

A floor slab of a steel-concrete composite structure using a reinforced concrete structure or a deck plate or the like is usually formed on the upper part of the foundation beam. Is provided, and the case where the floor slab formed on the foundation beam and the foundation beam are integrated via the shear connector is limited.

As described above, by forming the floor slab and the foundation beam of the first floor portion into a composite structure via the shear connector, a foundation structure having higher rigidity and strength can be obtained. Of course, in addition to the foundation beam in the frame direction, a shear connector may be provided on the upper surface of the foundation beam in the girder direction to further enhance the integrity.

A fifth aspect of the present invention limits the case where the foundation beam in the frame direction and the girder direction in the first, second, third or fourth aspect is covered with concrete. Can be prevented.

[0018] Claim 6 restricts the case in which only the outer peripheral surface of the foundation beam (the foundation beam in the frame direction and the girder direction) located on the outer periphery of the building is covered with concrete. It was done. When corrosion of steel foundation beams due to soil poses a problem, the corrosion prevention effect can be obtained only by covering only the outer peripheral portion of the building that touches the soil with concrete.

When the foundation beams in the ramen direction and the girder direction are made substantially the same, the area of these coated concrete forms can be reduced.

A seventh aspect of the present invention provides a method of constructing a foundation using the steel foundation beam according to the first, second, third, fifth or sixth aspect, and an H-shaped steel having a shear connector on a lower flange. In the state where multiple foundation beams in the direction of girder made of steel and multiple foundation beams in the girder direction made of shaped steel are connected, and these foundation beams are supported by jigs for fixing the foundation beams, reinforced concrete is placed under the foundation beams. The present invention is characterized in that a foundation beam and a foundation slab are integrated through a shear connector by constructing a foundation slab.

The jig for fixing the foundation beam can be manufactured by combining shaped steel, etc., and has a positioning function of supporting the foundation beam upward by the thickness of the foundation slab prior to the construction of the foundation slab. ing.

According to an eighth aspect of the present invention, a foundation using the steel foundation beam according to the fourth, fifth or sixth aspect, that is, at least the upper flange of the foundation beam in the frame direction is integrated with the floor slab. Stipulates the construction method in the case where shear connectors are provided for the frame, a plurality of base beams in the frame direction made of H-section steel having shear connectors on the lower and upper flanges, and a girder made of shaped steel. A plurality of foundation beams in different directions are connected, and a foundation slab made of reinforced concrete is constructed under the foundation beams while these foundation beams are supported by the foundation beam fixing jig. The beam and the foundation slab are integrated, the floor slab is constructed on the foundation beam, and the foundation beam and the floor slab are integrated via the upper flange shear connector. .

[0023]

1 to 3 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of a joint position of a steel column, and FIG. 3 is a vertical cross-sectional view in a direction perpendicular to these.

In the present embodiment, the concrete 16 is disposed at the bottom where the ground 17 is dug down, and the foundation is constructed thereon.

As for the base part, the base beam 2 in the direction of the rigid frame and the base beam 4 in the spar direction, which are orthogonal to each other, are connected in the form of a girder via the joining plate 18. These foundation beams 2 and 4 are made of H-shaped steel, and a shear connector 5 composed of a stud with a head is attached to upper and lower flanges thereof.

The foundation slab 6 is constructed in a state where the foundation beams 2 and 4 are supported by the foundation beam fixing jig 8 installed on the discarded concrete 16. The foundation slab 6 and the foundation beams 2, 4 are integrated as a composite structure via the shear connector 5 of the flange.

In this example, the covering concrete 15 is formed on the outer peripheral surfaces of the foundation beams 2 and 4 at the outer periphery of the building, and the covering concrete 15 is cast at the same time as the concrete of the foundation slab 6 is cast. It can be carried out.

The steel column 1 is provided with a foundation beam 2 in the direction of the rigid frame.
And, in the present embodiment, is rigidly connected by high-strength bolt bonding via two split tees 3.

In the figure, reference numeral 9 denotes a floor slab on the first floor. After the steel column 1 is joined, the floor slab 9 is connected to the floor slab 9 via the shear connector 5 on the upper flange of the foundation beams 2 and 4. The foundation beams 2, 4 are integrated as a composite structure.

The construction procedure in this embodiment is as follows.

After the ground 17 is dug down to a predetermined position, waste concrete 16 is constructed.

At a predetermined position on the discarded concrete 16, the lower surface of the frame 2 and the discarded concrete 1
A jig 8 for fixing a foundation beam, which is made of a combination of shaped steel or the like, is installed so that the interval between the base beams 6 is equal to the thickness of the foundation slab 6.

The reinforcing bar 7 of the foundation slab 6 is installed.

The foundation beam 2 in the direction of the frame is set on the foundation beam fixing jig 8.

The foundation beam 2 in the girder direction is connected to the foundation beam 2 in the frame direction by means of a joining plate 18 and bolts,
Assemble like a girder.

A split tee 3 is attached to the base beam 2 in the direction of the rigid frame at a position where the steel column 1 is to be attached. Also, reinforcing ribs 2a are attached as needed.

After assembling the formwork outside the foundation beams 2 and 4 on the outer periphery of the building, the concrete of the foundation slab 6 and the covering concrete 15 of the foundation beams 2 and 4 are simultaneously poured.

After the concrete has hardened, the steel column 1 is joined to the split tee 3 with high-strength bolts or the like.

The first floor slab 9 is constructed.

The above is an explanation of an example of a construction method, and the present invention is not limited to this. For example, the joint between the foundation beam 2 and the steel column 1 in the direction of the rigid frame may be a form in which a short steel column is welded to the foundation beam 2 in advance at a factory without using the split tee 3. Further, the foundation beam 2 in the frame direction and the foundation beam 4 in the girder direction can be joined by welding.

[0041]

According to the present invention, compared to the conventional foundation structure, the work required for the construction of the foundation beam, the column-shaped rebar and the formwork is eliminated or greatly reduced, and the construction period is shortened. it can.

The connection between the foundation beam and the steel column can be made simpler and more reliable than the conventional anchor bolt type.

Compared with the conventional foundation structure, the area of the formwork of the foundation beam can be greatly reduced, and the material can be saved and the construction period on site can be shortened.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a steel column joint position showing one embodiment of a basic structure of the present invention.

FIG. 2 is a vertical cross-sectional view of a position advanced in the digit-carrying direction of FIG.

FIG. 3 is a vertical sectional view in a perpendicular direction corresponding to FIGS. 1 and 2;

FIG. 4 is a vertical sectional view showing one example of a steel column joining position in a conventional foundation structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel column, 2 ... Foundation beam (in the direction of a rigid frame), 2a ... Stiffening rib, 3 ... Split tee, 4 ... Foundation beam (in the direction of girder), 5 ... Shear connector, 6 ... Foundation slab, 7 ... Foundation slab reinforcement , 8 ... fixing jig, 9 ... floor slab, 10 ...
Anchor bolt, 11 ... pillar type, 12 ... pillar type rebar, 13 ...
Base beam rebar, 14 ... base plate, 15 ... coated concrete, 16 ... discarded concrete, 17 ... ground, 18 ...
Joint plate

Claims (8)

[Claims] 1. A plurality of foundation beams in a frame direction, each of which is formed of an H-section steel having a shear connector on a lower flange, and a plurality of foundation beams, in a girder direction, each of which is formed of a shaped steel, and are connected via the shear connector. A foundation using a steel foundation beam, wherein the foundation is integrated with a reinforced concrete foundation slab under the beam, and a steel column is joined to an upper part of the foundation beam in the direction of the rigid frame. 2. The foundation using a steel foundation beam according to claim 1, wherein the foundation beam in the girder direction is an H-beam or a channel steel. 3. A foundation using a steel foundation beam according to claim 2, wherein a shear connector is also provided on a lower flange of the foundation beam in the girder direction. 4. A shear connector is provided on an upper flange of a foundation beam at least in a direction of a rigid frame, and a floor slab formed on the foundation beam and the foundation beam are integrated via the shear connector. Or a foundation using the steel foundation beam according to 3. 5. A foundation using a steel foundation beam according to claim 1, wherein the foundation beam in the direction of the rigid frame and in the direction of the girder are covered with concrete. 6. The concrete beam is applied only on the outer peripheral surface of the foundation beam located on the outer periphery of the building.
Foundation using the steel foundation beam described. 7. A plurality of H-shaped steel base beams having shear connectors on the lower flange in a frame direction and a plurality of girder direction base beams made of shaped steel are connected, and the base beams are fixed to the base beams. A reinforced concrete foundation slab is constructed under the foundation beam while being supported by the jig, and the foundation beam and the foundation slab are integrated via the shear connector. A method for constructing a foundation using the steel foundation beam according to 5 or 6. 8. A plurality of foundation beams in the frame direction made of H-section steel having shear connectors on the lower flange and the upper flange, and a plurality of foundation beams in the girder direction made of the shaped steel are connected to form the foundation beam. While being supported by the beam fixing jig, a reinforced concrete foundation slab is constructed under the foundation beam, the foundation beam and the foundation slab are integrated via the lower flange shear connector, and the floor is placed on the foundation beam. 7. The method according to claim 4, wherein a slab is constructed, and the foundation beam and the floor slab are integrated via the shear connector of the upper flange.