JP2536250Y2 - Steel foundation beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION This invention relates to a steel foundation beam.

2. Description of the Related Art A basic construction method has been considered in which a steel foundation beam composed of a vertically opposed flange and a web connecting the flanges is installed on site, and a structural body such as a pillar is directly fixed to the foundation beam. . In this case, to secure the weight of the entire foundation,
And, in order to prevent the rust of the foundation beam, the foundation beam is covered with concrete. In this case, simply placing the concrete around the foundation beam does not sufficiently fix the foundation beam to the concrete. Therefore, it is necessary to arrange reinforcing bars for fixing the foundation beam to the concrete.

Regarding the reinforcing bar arrangement, Japanese Utility Model Application No. 57-190854 (Japanese Utility Model Application Laid-Open No. 59-65055) describes a hoop-shaped reinforcing steel bar fitted on a base beam made of H-section steel. Have been.

Problems to be Solved by the Invention In the above, in the case of arranging reinforcing bars on site, there are disadvantages that the number of steps of the on-site construction increases and the construction period becomes longer. On the other hand, in the case of the above-mentioned prior application, the man-hours for such on-site construction can be reduced by previously fitting the hoop-shaped reinforcing bar to the foundation beam.

However, in the case of using such a hoop-shaped reinforcing bar, first, since the reinforcing bar is exposed on the upper flange of the foundation beam, it may interfere with the plate at the lower end of the column installed on the foundation beam. Has the disadvantage of causing Similar problems also occur when members other than columns, such as floor panels and joists, are fixed on the foundation beams. Furthermore, the rebar is also exposed on the lower surface of the foundation beam.For example, if this foundation beam is installed on a leveled base, the level of the upper surface of the foundation beam will not be accurately obtained, and it will take a lot of time to correct it. There is a disadvantage that it requires. In addition, such a hoop shape results in an increase in the amount of rebar and an increase in cost.

The purpose of the present invention is to eliminate such conventional disadvantages.

Means for Solving the Problems In order to achieve the above object, the present invention consists of a pair of vertically opposed flanges and a web connecting between the flanges, and between the two flanges, for fixing to concrete. The U-shaped rebar is welded with the horizontal piece at the upper end welded to the lower surface of the upper flange, and the horizontal piece at the lower end welded to the upper surface of the lower flange, and secured in a state that it protrudes outward from each flange In addition, the upper flange is provided with a bolt hole for installing and fixing the lower end of the column.

Embodiment FIGS. 4 to 6 show a method of constructing a solid foundation using the foundation beam of the present invention. First, as shown in FIG. 4, the ground is excavated to form a groove (1) along the foundation beam, gravel (2) is laid on the groove (1) and the slab portion, and the groove (1) in the groove (1) is formed. Concrete installation bases (3) (3) ... are constructed on site at various locations. Then, as shown in FIG. 5, the foundation beam (4) of the present invention is placed in the groove (1), installed on the mounting table (3), and joined together. A slab reinforcing bar (5) welded in a mesh shape is arranged in the space surrounded by the foundation beam (4), and a discarded formwork (6) is installed in the groove (1), and the outside is back-filled. At the same time, concrete (7) is cast in the discarded formwork (6) and the slab portion, and a concrete foundation as shown in FIG. 7 is constructed.

In FIG. 1, the foundation beam (4) of the present invention is composed of a pair of vertically opposed flanges (8) and (9) and a web (10) connecting between central portions of the flanges (8) and (9). A plurality of stiffener plates (11) (11) are welded at appropriate intervals in the longitudinal direction between the flanges (8) and (9). (12) is a reinforcing bar of the present invention, which is bent into a substantially U-shape, and upper and lower horizontal pieces (13) are respectively provided on the upper side with an upper flange (8).
Are welded to the upper surface of the lower flange (9) on the lower side, and a number of them are spaced apart in the longitudinal direction while being opposed to both sides of the web (10). An anchor bolt hole (14) for fixing a structural body such as a pillar is formed in the upper flange (8) in advance.

FIG. 2 shows a state after the concrete (7) is cast. When the concrete (7) is cast in this way, the foundation beam (4) is fixed by the reinforcing bars (12) (12) fixed thereto. , And settles on the cast concrete (7). A conventionally known disk-shaped spacer (17) is attached to the vertical portion of the reinforcing bars (12) (12). The abutting thickness of the rebars (12) and (12) is ensured by the contact. At this time, the reinforcing bars (12) and (12) are connected to each flange (8) of the foundation beam (4).
Since it is located outside of (9), if the thickness of the reinforcing bars (12) and (12) is secured as described above, the reinforcing bars (12)
The foundation beam (4) having a different covering thickness from that of (12) can automatically obtain the required covering thickness.

As shown in FIG. 2, the end of the slab reinforcing bar (5) is inserted into a mounting hole (18) formed in the web (10) of the foundation beam (4). The nut (19) is retained so that it does not come off.

FIG. 3 shows the mounting structure of the column (20). The mounting plate (21) is previously welded to the lower end of the column (20) made of H-shaped steel, and formed on the mounting plate (21). The bolt hole (22) and the anchor bolt hole (14) of the upper flange (8) are aligned with each other, and tightened and fixed by the bolt (23) inserted from above and the nut (24) screwed into the bolt (23). I am trying to do it. In order to enable the bolt (23) and nut (24) to be tightened, concrete has been cut out of the mounting part of the column (20) in advance, and this notched part (25) Concrete is filled after the pillar (20) is installed.

Effect of the Invention As described above, according to the invention, the steel base beam is
Reinforcing bars for fixing the foundation beams to the concrete side are fixed in advance, so there is no need to perform such reinforcement bars on site, and it is possible to perform reinforcement at the same time simply by installing the foundation beams. This has the effect of greatly reducing labor on site and shortening the construction period.

Further, since the reinforcing bar is welded and fixed between both flanges of the foundation beam, the effect of the reinforcing bar as shear reinforcement is increased, and the concrete strength is further improved.

Furthermore, the upper flange of the beam is provided with a bolt hole for fixing the column, so that the column is directly fixed to this beam. There is no need for trimming and there is no need to stand short columns between beams and join them with columns.

In addition, each reinforcing bar is roughly U-shaped, and the horizontal piece at the upper end is welded to the lower surface of the upper flange of the beam, and the horizontal piece at the lower end is welded to the upper surface of the lower flange. There is no danger of interference with the plate at the lower end of the column fixed on the other hand, and on the other hand, even if the lower flange is installed on a leveled base etc., there is no reinforcing bar under the beam, so install it as such There is an advantage that the level of the upper surface of the beam can be accurately obtained only by using the above method. Alternatively, there is no disadvantage that the reinforcing bar interferes with the base. In addition, there is no danger of the reinforcing bars being crushed due to the heavy foundation beams, even if they are installed at the factory or on site. On the other hand, since the reinforcing bar is bent into a U-shape and welded with the horizontal piece, the reinforcing bar and the flange of the beam can obtain a sufficient welding length and a sufficient bonding strength.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a foundation beam of the present invention, FIG. 2 is a cross-sectional view of a main part of a foundation part using the foundation beam of the present invention, and FIG. 4 to 6 are perspective views showing a method of constructing a solid foundation using a foundation beam, and FIG. 7 is a cross-sectional view of the entire solid foundation using a foundation beam. (4) ... foundation beam, (8) (9) ... flange, (10)
... web, (12) ... rebar, (13) ... horizontal strip, (1
4) Bolt holes.

Claims (1)

(57) [Scope of request for utility model registration] 1. A substantially U-shaped reinforcing bar for fixing to concrete is provided between a pair of vertically opposed flanges and a web connecting between the flanges. The lower piece is welded to the lower face of the upper flange and the lower piece is fixed to the upper face of the lower flange by welding, and the upper flange has bolt holes for installing and fixing the lower end of the column. A characteristic steel foundation beam.