JP2006283459A - Foundation reinforcement bar assembly of detached house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exhibit performance of a shearing reinforcement bar of a foundation reinforcement bar assembly of a detached house, without depending on a hook and welding. <P>SOLUTION: This foundation reinforcement bar assembly 2 of a detached building is constructed by welding the shearing reinforcement bar 33 to a horizontal main reinforcement bar 31 by vertically crossing with the main reinforcement bar. A node-like end thick part 34 is formed by applying diametrally expansive processing to an end part of the shearing reinforcement bar 33. The node-like end thick part 34 functions as an anchoring part of the shearing reinforcement bar 33. Thus, the shearing reinforcement bar 33 can sufficiently resist shearing stress. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reinforcing bar assembly assembled as a foundation for a detached house such as a three-story building.

The reinforcing bars for foundations of this kind of detached buildings are welded by crossing a vertical shearing bar with a horizontally extending main bar. The end of the shear line is bent into a U shape, an L shape, or a letter shape, and serves as a fixing hook. The hooks are fixed to the foundation concrete, so that the shear bars bear the shearing force.
Japanese Patent Laid-Open No. 09-060006

If a U-shaped, L-shaped or L-shaped hook is provided at the end of the shearing bar, it is difficult to weld the shearing bar and the main bar. In addition, it is considered that the strength of the welded portion of the main bar is reduced by heat during welding. If it does so, there exists a possibility that a main reinforcement may cut | disconnect in a welding part.
The present invention has been made in view of the above circumstances, and an object of the present invention is to enable the performance of the shear bars of the foundation rebar assembly of a detached house to be demonstrated without using hooks or welding. It is in.

The present invention has been made in view of the above circumstances,
A rebar assembly assembled for the foundation of a detached building,
A horizontal main line,
The main bar and the shear bar welded in a vertical direction,
An end thick portion that is thicker than a main body portion of the shear line is provided at an end of the shear line.
This makes it possible to sufficiently resist the shear stress using the thick end portion of the end portion of the shear line as a fixing portion, and to fully exhibit the performance of the shear line without depending on the hook or welding.

  It is preferable that the end thick portion is integrally formed with the main body portion by subjecting the end portion of the shear line to diameter expansion processing.

  A male screw may be engraved at the end of the shear line, a nut may be screwed into the male screw, and the nut may be used as the thick end portion.

The shear bar is a screw bar;
The end thick portion may integrally include a nut screwed into the end portion of the screw rebar and a plate having a larger area than the nut.

  You may decide to provide the said end thick part only in the shear line of an edge part among the edge part of the said main reinforcement, and an intermediate part. Generally, the shear stress is relatively large at the end of the main muscle, and the shear stress is relatively small at the middle of the main muscle.

  According to the present invention, the shear line can sufficiently resist the shear stress using the thick end portion as the fixing portion. Therefore, it is not necessary to form a hook at the end of the shear bar, and the welding operation of the shear bar and the main bar can be facilitated. Since the end thick portion can exhibit a fixing strength equal to or higher than that of the hook, the performance of the shear reinforcement can be sufficiently ensured regardless of the welding strength with the main reinforcement. Therefore, it is not necessary to weld until the main bar is reduced in strength, and the possibility that the main bar is cut at the welded portion can be avoided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a fabric foundation 1 of a three-story detached building.
The fabric foundation 1 has a horizontal base portion 11 and a rising portion 12 rising vertically from the base portion 11 and has an inverted T-shaped cross section.

A reinforcing bar assembly 2 is embedded in the fabric foundation 1.
The reinforcing bar assembly 2 includes a base assembly 20 in the base portion 11 and a rising assembly 30 corresponding to the rising base portion.
The base assembly 20 includes a base bar 21 that faces the width direction of the fabric foundation 1 and a base auxiliary bar 22 that faces the extending direction of the cloth foundation 1.

As shown in FIG. 2, the rising assembly 30 includes a main muscle 31 (horizontal muscle), an abdominal muscle 32, and a shear muscle 33 (vertical muscle). The main muscle 31, the abdominal muscle 32, and the shear muscle 33 are configured by a general deformed reinforcing bar having a rib 30a and a fist 30b (FIG. 3).
One or a plurality of the main bars 31 are arranged on the upper side and the lower side of the rising assembly 30 and extend in the same direction as the direction in which the fabric foundation 1 extends. The main bar 31 has a larger diameter than the shear bar 33, but may have the same diameter as the shear bar 33 or a smaller diameter than the shear bar 33.
The abdominal muscle 32 extends in parallel with the main muscle 31 at an intermediate height of the rising assembly 30.
In addition, you may change suitably the arrangement position, the number, thickness, etc. of the main muscle 31 or the abdominal muscle 32. FIG.

A plurality of shear bars 33 are arranged at intervals in the extending direction of the fabric foundation 1.
Each shear muscle 33 extends vertically and intersects with the main muscle 31 and the abdominal muscle 32. The main muscle 31, the shear muscle 33, and the abdominal muscle 32 are connected to each other at the intersections by welding.

  As shown in FIG. 3, the upper and lower end portions of the shearing bar 33 are each expanded in the shape of a hump to constitute a thick end portion 34. The bump-shaped end thick portion 34 protrudes in the radial direction from the main body portion 33 a of the shear bar 33 over the entire circumference, and has a larger cross-sectional area than the main body portion 33 a of the shear bar 33. The outer diameter of the largest cross section of the end thick portion 34 is preferably 1.5 to 3 times the outer diameter of the reinforcing bar base material of the shear bar 33 main body portion 33a.

  The reinforcing bar assembly 2 having the above configuration is processed and assembled at a factory. The end portion of the shearing bar 33 is subjected to a diameter expansion process by pressurization, heating, or the like, and a bump-like thick end portion 34 is formed integrally. The shear muscle 33, the main muscle 31, and the abdominal muscle 32 are connected by spot welding. Semi-automatic welding or arc welding may be performed instead of spot welding. Since the end of the shear bar 33 is only the end thick part 34 and is not a U-shaped hook, the welding operation of the shear bar 33 and the main bar 31 is easy.

The completed rebar assembly 2 is transported from the factory to the construction site of the detached building. And it arrange | positions in the formwork for cloth foundation 1, and casts concrete 1C and embeds it.
The bump-shaped end thick portion 34 in the foundation concrete 1C has a sufficiently large bearing area, and can exhibit a fixing strength equal to or higher than that of the hook-shaped fixing portion. Accordingly, the shear muscle 33 can sufficiently resist the shear stress and can surely bear the shear strength. For this reason, the welding strength between the shear bar 33 and the main bar 31 is not limited so long as it can maintain a connected state during transportation or when placing concrete 1C. Therefore, it is not necessary to weld until the main bar 31 is reduced in strength, and the possibility that the main bar 31 is cut at the welded portion can be avoided. Also, there is no problem if there is variation in welding.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for the same configurations as those of the above-described embodiments, and the description thereof is omitted.
As shown in FIG. 4, the end thick portions 34 do not have to be provided in all the shear bars 33, and may be provided at least in the shear bars 33 in the region R <b> 1 having a certain length from the end of the main bar 31. You may decide not to provide in the shear reinforcement 33 of area | region R2 (intermediate part of the main reinforcement 31). This is because the shear stress to be borne by the shear muscle 33 is generated exclusively in the end region R1 and does not act so much in the intermediate region R2. The length of the end region R1 is preferably 1 to 1.5 times the height H of the foundation 1 (FIG. 1). The end of the shear bar 33 in the intermediate region R2 has the same thickness as the main body portion 33a.

The foundation for a detached building to which the present invention is applied is not limited to the fabric foundation 1. Further, the thick end portion 34 is not limited to both end portions of the shearing bar 33, and may be provided only at one end portion.
For example, in the embodiment shown in FIG. 5, the foundation for a detached building is constituted by a solid foundation. In the solid foundation reinforcing bar assembly 2X, the lower end of the shear bar 33 is bent and becomes horizontal, and the horizontal part constitutes the base bar 21. A bump-like thick end 34 is provided only at the upper end of the shear bar 33.

The thick end portion as the fixing portion of the shearing bar 33 is not limited to the bump-like part 34 obtained by expanding the end of the shearing bar 33.
For example, in the modification shown in FIG. 6, a male screw 33b is cut at the end of the shear bar 33 (FIG. 6A), and a nut 35 is screwed into this (FIG. 6B). The nut 35 has a larger diameter than the shear bar 33. The nut 35 constitutes a thick end portion of the shear bar 33 and serves as a fixing portion for fixing the end portion of the shear bar 33 to the foundation concrete 1C.

  In the modification of FIG. 7, the shear bars are constituted by screw rebars 33 </ b> X (FIG. 7A), and a fixing hardware 36 is provided as a fixing part at the end thereof. The fixing metal 36 integrally includes a plate 37 and a nut 38. As shown in FIG.7 (b), the nut 38 is screwed by the edge part of the shear reinforcement 33X which consists of a screw reinforcement. The nut 38 has a larger diameter than the shear bar 33X. The plate 37 has a larger area than the nut 38 and protrudes in a flange shape on the radially outer side of the nut 38.

  In the modification of FIG. 8, the flat steel plate 39 is abutted against the end of the shear bar 33 and is welded or pressed. The area of the flat steel plate 39 is sufficiently larger than the cross-sectional area of the shear bar 33. The flat steel plate 39 constitutes a thick end portion and serves as a fixing portion for fixing the end portion of the shear bar 33 to the foundation concrete 1C. The flat steel plate fixing section 39 may be circular, quadrangular, or other shapes.

The present invention is not limited to the embodiment described above, and modifications can be made.
For example, a detached building to which the foundation of the present invention is applied is not limited to a three-story building, and may be a four-story building or a two-story building or a one-story building.

It is front sectional drawing of a fabric foundation. It is a side view of the reinforcing bar assembly of the above-mentioned cloth foundation. It is a front view which expands and shows the fixing | fixed part of the shear reinforcement of the said reinforcing bar assembly. It is a top view of a cloth foundation. It is a front view of the reinforcing bar assembly for solid foundations. It is a front view which shows the modification of the fixing part of a shear line. It is a front view which shows the modification of the fixing part of a shear line. It is a front view which shows the modification of the fixing part of a shear line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cloth foundation 1X Solid foundation 1C Foundation concrete R1 Area | region R2 which provides end thick part Area 2 which does not provide end thick part 2 Reinforcement assembly for cloth foundation 2X Reinforcement assembly for solid foundation 11 Base part 12 Standing part 20 Base assembly 21 Base Muscle 22 Base auxiliary muscle 30 Standing assembly 31 Main muscle 32 Abdominal muscle 33, 33X Shear muscle 33a Shear muscle main body portion 34 Hump-shaped end thick portion 33b Male screw 35 Nut (end thick portion)
36 Fixing hardware (edge)
37 Plate 38 Nut 39 screwed into the screw rebar Reinforced flat steel plate

Claims (5)

A rebar assembly assembled as a foundation for a detached building,
A horizontal main line,
A shearing bar welded perpendicularly to the main bar,
A reinforcing bar assembly for a foundation of a detached house, wherein an end thick part thicker than a main body part of the shearing bar is provided at an end of the shearing bar.   2. The rebar assembly for a foundation of a detached house according to claim 1, wherein the end thick portion is formed integrally with the main body portion by subjecting the end portion of the shear reinforcement to diameter expansion processing. .   2. A foundation for a detached house according to claim 1, wherein a male screw is engraved at an end of the shearing bar, a nut is screwed onto the male screw, and the nut is used as the thick end portion. Rebar assembly. The shear bar is a screw bar;
The foundation of a detached house according to claim 1, wherein the end thick portion integrally includes a nut screwed into an end portion of the screw rebar and a plate having a larger area than the nut. Reinforcing bar assembly.   The reinforcing bar assembly for a foundation of a detached house according to any one of claims 1 to 4, wherein the thick end portion is provided only at the shearing bar at the end portion of the end portion and the intermediate portion of the main reinforcing bar. .

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