JPH0988086A - Continuous footing by using unequal-width h-steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous footing having excellent stability and connection in upper structure, simple structure and also superior workability. SOLUTION: The ground 6 is excavated, and a footing base 5 is formed by a gravel layer, rubble, crushed stones 7, leveling concrete 8, etc. Unequal- width H-steel 1a is installed onto the footing base 5 while downwards directing the lower flange 2 side in broad width, and concrete 9 is placed so as to surround the lower section of the unequal-width H-steel 1a and the H-steel 1a is fixed. Contact pressure (p) can be lowered by the width of a lower flange 2, and the width of the lower flange 2 is made sufficiently wider than an upper flange 3 so as to improve adhesion with concrete. The upper flange 3 of the unequal-width T-steel 1a is formed in the same width as a column member, etc., constituting upper structure for enhancing the connection of upper structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a continuous footing foundation using a non-uniform width H-section steel in which a width of a lower flange is larger than a width of an upper flange, and is used as a foundation of a building such as a house. .

[0002]

2. Description of the Related Art Conventionally, the foundation of a building such as a house is mainly constructed by a direct foundation structure.

In a continuous footing foundation (fabric foundation) made of reinforced concrete, which is a type of direct foundation structure, as shown in FIG. 8, the ground 6 is excavated so that the ground surface is well-fitted with the foundation. After forming the bottom surface 5 of the foundation by crushing, crushed stone 7, discarded concrete 8, etc., the reinforcing bar 10 is laid out, the form is assembled, and the concrete 9 is placed.

Further, in the continuous footing foundation of H-section steel, usually, as shown in FIG. 9, the ground 6 is excavated and, similarly, the bottom surface 5 of the foundation is formed, then the H-section steel 1 is installed, and the lower part thereof is made of concrete. It has a structure of fixing with 9.

In addition, as a basic structure using the H-shaped steel as a part thereof, the basic structure in which the H-shaped steel is fixed on a precast concrete base fixing plate is disclosed in JP-A-4-80426. 4-128428, Japanese Patent Laid-Open No. 4-128428
Japanese Patent No. 128430 discloses a basic structure in which H-shaped steel is surrounded by reinforced concrete.

[0006]

In the conventional continuous footing foundation (fabric foundation) made of reinforced concrete, since reinforcing bars are arranged and a frame is assembled and concrete is placed, the construction is often done on site and the construction period is short. It is long and labor costs are high. In addition, joining with the upper structure was complicated because it was necessary to embed anchor bolts and vent holes when pouring concrete.

Continuous footing foundation using H-section steel In the footing foundation, since the upper flange is wider than the upper structure, as shown in FIG. 10, the upper structure (in the figure, reference numeral 15 indicates a column member of the upper structure, 20 is a wall panel) and the lower flange 2 has the same width as the upper flange 3, so that the ground pressure p is high, the adhesion area (contact area) with concrete is small, and the integration with concrete is low. Weak,
Also, the stability was poor.

The present invention is intended to solve the above-mentioned problems, and the use of H-section steels of non-uniform width provides good stability and superstructure, and a simple structure and excellent workability. It is intended to provide a continuous footing foundation.

[0009]

A continuous footing foundation according to claim 1 of the present application uses a non-uniform width H-section steel in which the width of the lower flange is larger than the width of the upper flange, and the lower flange is installed on the bottom surface of the foundation. The upper structure of the building is installed on the upper flange.

Since the width of the lower flange is wider than that of the upper flange, the ground contact pressure is low, the adhesion area with concrete is large, the integration with concrete is strong, and the stability is good. Further, by setting the width of the upper flange to be narrow, it is possible to improve the fitting of the upper structure.

The second aspect limits the case where the lower portion of the H-section steel of non-uniform width is embedded and fixed in concrete.

According to the third aspect of the present invention, the case where the air holes are provided in the web of the H-section steel of non-uniform width is limited, and it is possible to easily attach the web in the factory by simple processing, and the field work is simplified.

In addition to the above, the upper flange of the H-section steel of varying width is
Simplify on-site work by drilling the joint with the upper structure and joining the joint metal by welding etc.
Furthermore, the construction period can be shortened.

The material of the non-uniform width H-section steel is not particularly limited, and weather resistant steel or stainless steel may be used. Also, welded H-section steel or rolled H-section steel may be used.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 conceptually shows one embodiment of the present invention.

In this structure, first, the ground 6 is excavated, and the gravel, the splits, the crushed stone 7,
The bottom surface 5 of the foundation is formed by discarding concrete 8 or the like.

Then, the non-uniform width H-section steel 1a is installed with the wide lower flange 2 side facing down, and after adjusting the level, concrete 9 is embedded in the lower part of the non-uniform-width H section steel 1a. Place and fix. The width of the lower flange 2 is made sufficiently wider than that of the upper flange 3 so that the ground pressure p can be lowered and the adhesion to concrete can be enhanced.

The concrete 9 may be fixed to the H-section steel 1a having an uneven width, or may be cast up to the surface of the ground 6. Further, the web 4 portion may be poured with concrete 9 or may be backfilled with soil.

The upper flange 3 of the H-section steel 1a having an unequal width has the same width as that of the column member 15 in order to improve the fitting so as not to interfere with the upper structure such as the wall panel 20 (see FIG. 2).

In the figure, reference numeral 11 indicates soil concrete.

FIG. 3 shows an embodiment in which the ventilation holes 12 are previously attached to the web 4 portion of the H-section steel 1a having a non-uniform width (corresponding to claim 3). It can be installed easily and simplifies on-site work.

Further, as shown in FIGS. 4 (a) to 4 (c), the non-uniform width H-section steel 1a can be easily joined to the upper structure such as the pillar member 15 and the large pull 16 at the site. Therefore, the bolt holes 13 may be drilled in the upper flange 2 or the metal fitting 14 may be joined by welding in a factory or the like.

Further, in order to improve the adhesion to the concrete 9, a steel plate 17 with projections (see FIG. 5) is used for the web 4 or the flanges 2 and 3 of the H-section steel 1a of non-uniform width, or the adhesion to the concrete 9 is increased. In addition to this, it is also conceivable to use a corrugated steel plate 18 (see FIG. 6) for the web 4 of the H-section steel 1a having a non-uniform width in order to improve the shear strength.

FIG. 7 shows, as another embodiment, an example in which the through holes 19 are provided in the web 4 of the H-section steel 1a of non-uniform width to improve the circumference of the concrete 9 to improve the adhesion of the concrete 9. It is a thing.

[0025]

The width of the lower flange of the H-shaped steel forming the continuous footing foundation is wider than the width of the upper flange, so that the ground contact pressure can be lowered and the adhesion to concrete can be increased.
And a stable basic structure can be obtained.

[0026] The upper flange can be accommodated better by having the same width as a column member or a structural member such as a large pull that constitutes the upper structure so as not to interfere with the upper structure.

Compared with the basic structure of reinforced concrete construction, since no reinforcements and formwork are required, the construction becomes easier,
The work period can be shortened and labor costs can be reduced.

[0028] On the upper flange, a joint with a superstructure such as a pillar or a large pull is perforated at a factory, a metal joint is welded, or a ventilation hole is attached to the web portion. By pre-fab processing such as putting it down, the work on site is reduced and the construction period can be shortened.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing the relationship between the ground pressure and the accommodation of the upper structure in the present invention.

3A and 3B show an example of processing a non-uniform width H-shaped steel portion used in the present invention, in which FIG. 3A is a front view and FIG. 3B is a sectional view taken along line AA.

FIG. 4 shows an example of processing a non-uniform width H-shaped steel portion used in the present invention. (A) is a front view, (b) is a BB sectional view thereof, and (c) is a CC sectional view. It is a figure.

5A and 5B are views showing a part of a steel plate with protrusions used in a modified example of H-section steel of non-uniform width, wherein FIG. 5A is a plan view and FIG. 5B is a front view.

FIG. 6 is a perspective view showing a part of a corrugated steel sheet used in a modified example of H-section steels of non-uniform width.

FIG. 7 is a front view in the case where holes are provided in a web as a modified example of the H-section steel of non-uniform width.

FIG. 8 is a sectional perspective view showing an example of a conventional reinforced concrete continuous footing foundation.

FIG. 9 is a cross-sectional perspective view showing an example of a conventional continuous footing foundation using H-shaped steel.

FIG. 10 is an explanatory diagram showing the relationship between the ground pressure and the accommodation of the upper structure in the conventional example of FIG.

[Explanation of symbols]

1 ... H section steel, 1a ... unequal width H section steel, 2 ... lower flange,
3 ... Top flange, 4 ... Web, 5 ... Foundation bottom, 6 ... Ground, 7 ... Crushed stone, 8 ... Waste concrete, 9 ... Concrete, 10 ... Rebar, 11 ... Earth concrete, 12 ... Vent hole, 13 ... Bolt hole, 14 ... Joining hardware, 15 ... Column member, 16 ... Large pull, 17 ... Steel plate with protrusions, 18 ... Corrugated steel plate, 19 ... Hole, 20 ... Wall panel

Claims (3)

[Claims] 1. The lower flange of a non-uniform width H-shaped steel in which the width of the lower flange is larger than the width of the upper flange is installed on the bottom surface of the foundation, and the upper structure of the building is installed on the upper flange. Continuous footing foundation using non-uniform width H-section steel. 2. The continuous footing foundation using non-uniform width H-section steel according to claim 1, wherein the lower part of the non-uniform-width H section steel is embedded and fixed in concrete. 3. A continuous footing foundation using non-uniform width H-section steel according to claim 1 or 2, wherein the non-uniform-width H section steel web is provided with ventilation holes.