JP2011202387A - Structure for reinforcing base concrete with opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure which enables base concrete with an opening, made in reform or termite prevention work etc., to be effectively reinforced following a small number of construction procedures without needing a bed-sill.SOLUTION: In this structure for reinforcing the base concrete 2 having the opening 1 serving as a passage and made of reinforced concrete, a pair of first reinforcing fittings 3 abutting on the one-side lateral surface of the base concrete 2 is fixed on both the right and left sides of the opening 1, respectively; a second reinforcing fitting 4 longer than a width portion of the opening 1 and placed on the upside of the first reinforcing fitting 3 makes the first reinforcing fittings 3 coupled and fixed together while securing passage through the opening 1; and a third reinforcing fitting 5 made of a metal member longer than the width portion of the opening 1 is fixed to the one-side lateral surface of the base concrete 2 between a lower end of the opening 1 and that of the base concrete 2.

Description

  The present invention relates to a reinforcing structure for foundation concrete having an opening.

In general, wooden structures in Japan have a structure in which a foundation is placed on foundation concrete and a pillar is erected on this foundation.
As the foundation concrete of such a wooden structure, a cloth foundation or a solid foundation formed around the base is often used.
In the case of renovation and ant proofing work, it is necessary to pass wiring and piping, or for people to go in and out, so this basic concrete may be partially cut out to form an opening.

However, if this opening is left as it is even after the renovation or ant-proof work is completed, the strength of the foundation concrete is lowered, which is not preferable.
That is, the foundation concrete with an opening receives a large force from a pillar or the like depending on the opening location, and cannot sufficiently hold the load.

  Therefore, a method for reinforcing the foundation concrete having the opening as described above has been proposed (for example, see Patent Document 1).

However, in this method, a foundation is essential, and if the foundation is not solid or there is a foundation joint on the opening of the foundation, there is no strength and the foundation is solid. There was a problem that it was difficult to understand at first glance.
In addition, this method integrates the foundation and the foundation to exert strength, and therefore, it is necessary to fill the gap with a packing plate or the like in order to fill the gap between the foundation and the foundation having different widths. In addition, since the gaps are various, it is necessary to prepare packing plates with various widths, which is complicated. In addition, as described above, since this method unifies the foundation and the foundation to exert the strength, an anchor bolt that actually connects the foundation and the foundation is necessary.
Therefore, in the case of this method, the actual construction procedure increases and it is difficult to say that it is easy.

JP 2007-40103 A

  The present invention solves the above-mentioned conventional problems and effectively reinforces the basic concrete having an opening opened at the time of renovation or ant-prevention work without requiring a foundation with a few construction procedures. An object of the present invention is to provide a reinforcing structure that can be used.

That is, the present invention according to claim 1 is a reinforcing structure of a basic concrete made of reinforced concrete having an opening serving as a passage, and is a first structure in contact with one side surface of the foundation concrete on both the left and right sides of the opening. A pair of reinforcing metal fittings, and the second reinforcing metal fittings having a length longer than the lateral width of the opening placed on the upper side of the first reinforcing metal fittings, It is connected and fixed while ensuring passage in the opening, and is formed of a metal member that is longer than the lateral width of the opening on one side surface of the foundation concrete between the lower end of the opening and the lower end of the foundation concrete. The present invention provides a reinforcing structure for basic concrete having an opening, characterized in that a third reinforcing metal fitting is fixed.
The present invention according to claim 2 is characterized in that the first reinforcing brackets are arranged such that the lower ends of the second reinforcing brackets are slightly below the upper ends of the foundation concrete, and the second reinforcing brackets. The reinforcing structure according to claim 1, wherein the upper end of the base metal is connected and fixed by the second reinforcing metal fitting so that the upper end is slightly above the upper end of the foundation concrete.
The present invention according to claim 3 is the reinforcing structure according to claim 1 or 2, wherein the first reinforcing metal fitting and the second reinforcing metal fitting each have a lip groove shape. It is to provide.
This invention which concerns on Claim 4 provides the reinforcement structure in any one of Claims 1-3 which fixes the said 1st reinforcement metal fitting using a post-construction anchor.
This invention which concerns on Claim 5 provides the reinforcement structure in any one of Claims 1-4 which fixes the said 3rd reinforcement metal fitting using a post-construction anchor.
The above reinforcing structure relates to the reinforcing structure of the basic concrete made of reinforced concrete. Hereinafter, this may be referred to as the first aspect of the present invention.
The present invention according to claim 6 is a reinforcement structure for unreinforced basic concrete having an opening serving as a passage, and the first reinforcement that abuts against one side surface of the basic concrete on both the left and right sides of the opening. A pair of metal fittings are fixed, and the first reinforcing metal fittings are mounted on the upper side of the first reinforcing metal fittings, and the second reinforcing metal fitting is longer than the lateral width of the opening. And connecting and fixing while securing the passage in the third side, and a third side made of a metal member longer than the lateral width of the opening on one side surface of the foundation concrete between the lower end of the opening and the lower end of the foundation concrete. And a fourth reinforcing bracket made of a metal member that is longer than the third reinforcing bracket, and the other side surface different from the reinforced foundation concrete. , Lower end of the opening Between the lower end of the foundation concrete, a long metal member is used alone or in combination with a plurality of strips to form a band, and a fifth reinforcing bracket is installed over the entire lateral width of the other side surface. A base having an opening, characterized in that a sixth reinforcing metal fitting made of a single metal member or a plurality of metal members joined together in a band shape is installed across the entire width of the other side surface across the opening. A concrete reinforcing structure is provided.
The present invention according to claim 7 provides the reinforcing structure according to claim 6, wherein the fourth reinforcing metal fitting is formed by stacking two metal members or by a thick metal member. is there.
The above reinforcing structure relates to the reinforcing structure of unfounded basic concrete. Hereinafter, this may be referred to as a second aspect of the present invention.

According to the present invention, it is possible to effectively reinforce a foundation concrete having an opening opened at the time of renovation or ant-proof work without requiring a foundation with few construction procedures.
That is, according to the present invention, a foundation concrete having an opening opened when underfloor construction such as renovation or ant proofing construction is required without requiring a foundation, with few construction procedures. It is possible to return the strength above the level of foundation concrete without openings.
Therefore, according to the present invention, it is possible to avoid the possibility of reducing the strength of the wooden structure on the foundation concrete having the opening, although only a small construction procedure is required.

More specifically, according to the present invention, since only the reinforcement of the foundation is considered without the need for a foundation, a packing plate or an anchor bolt for integrating the foundation and the foundation is unnecessary. .
Also, in general, the construction includes fixing the first reinforcing brackets on both the left and right sides of the opening, connecting and fixing the first reinforcing brackets to each other with the second reinforcing bracket, and the width of the opening. Three steps of fixing the 3rd reinforcement metal fitting which consists of a long metal member to the lower surface of an opening part are sufficient, and it is excellent in workability.
And according to this invention, it has sufficient intensity | strength.

It is a front view which shows one example of the 1st aspect of this invention. It is a cross-sectional explanatory view of FIG. It is explanatory drawing which shows each cross-sectional shape of the 1st reinforcement metal fitting 3 (3A, 3B) and the 2nd reinforcement metal fitting 4. FIG. It is explanatory drawing which shows the post-construction anchor 6 and washer (washer) 7 which are used for this invention. It is a front view which shows one example of the 1st reinforcement metal fitting 3 (3A, 3B). It is a front view which shows one example of the 2nd reinforcement metal fitting 4. FIG. It is a front view which shows one example of the 3rd reinforcement metal fitting 5. FIG. It is a front view which shows one example of the 2nd aspect of this invention. It is a cross-sectional explanatory view of FIG. It is a rear view of FIG. It is explanatory drawing which shows the pattern of the bending shear strength test (compression side) using the cloth foundation which consists of a reinforced concrete which has an opening part performed in the reference example 1-1. It is explanatory drawing which shows the pattern of the bending shear strength test (tensile side) using the fabric foundation which consists of reinforced concrete which has an opening part performed in Reference Example 1-2. It is explanatory drawing which shows the pattern of the bending shear strength test (tensile side) using the cloth foundation which consists of reinforced concrete which has an opening part performed in Example 1-2. It is explanatory drawing which shows the pattern of the bending shear strength test (compression side) using the cloth foundation which consists of reinforced concrete which has an opening part performed by the comparative example 1-1. It is explanatory drawing which shows the pattern of the bending shear strength test (tensile side) using the cloth foundation which consists of reinforced concrete which has an opening part performed by the comparative example 1-2. It is explanatory drawing which shows the shape of the reinforcing bar used in calculation of a foundation. It is explanatory drawing which shows how to apply the load in an intensity | strength test.

  1st aspect of this invention is the reinforcement structure of the foundation concrete which consists of a reinforced concrete which has the opening part used as a channel | path, Comprising: The 1st reinforcement contact | abutted to the one side surface of the said foundation concrete on the both right and left sides of the said opening part A pair of metal fittings are fixed, and the first reinforcing metal fittings are mounted on the upper side of the first reinforcing metal fittings, and the second reinforcing metal fitting is longer than the lateral width of the opening. And connecting and fixing while securing the passage in the third side, and a third side made of a metal member longer than the lateral width of the opening on one side surface of the foundation concrete between the lower end of the opening and the lower end of the foundation concrete. The reinforcing metal fitting is fixed.

  The first aspect of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing an example of the first aspect of the present invention, and FIG. 2 is an explanatory sectional view thereof.

1st aspect of this invention is the reinforcement structure of the basic concrete 2 which consists of a reinforced concrete which has the opening part 1 used as a channel | path.
In the first aspect of the present invention, a pair of first reinforcing metal fittings 3 (3A, 3B) that are in contact with one side surface of the foundation concrete 2 are fixed to the left and right sides of the opening 1.

In addition, as the opening part 1, the object opened mainly when underfloor construction such as renovation or ant protection work is mainly targeted, but even if it is originally provided in the foundation concrete 2 Good.
For example, the opening 1 has a width of about 450 mm and a height of about 300 mm, but is not limited thereto.
Here, the foundation concrete 2 is not an independent foundation formed independently on the pillar portion, but a cloth foundation and a solid foundation formed on the entire foundation or most of the foundation. This basic concrete 2 is made of ordinary reinforced concrete.
Further, the opening 1 is intended to be provided on the upper side of the foundation concrete 2 as shown in FIG.

The material of the first reinforcing bracket 3 (3A, 3B) is not limited to stainless steel, iron, or the like, and may be subjected to rust prevention treatment such as galvanization.
Next, as a shape of the first reinforcing metal fitting 3 (3A, 3B), from the viewpoint of further weight reduction, FIG. 1 shows a substantially inverted trapezoidal shape (or a substantially inverted jump box shape). However, the shape is not necessarily limited to this, and may be a substantially rectangular shape.
Further, as the first reinforcing metal fitting 3 (3A, 3B), the one having a substantially U-shaped cross-sectional shape is used. In particular, as shown in FIG. 3, the end portion is further folded inward. The lip groove shape as described above is preferable because it can be made thinner and can be reduced in weight. Therefore, as the first reinforcing metal fitting 3 (3A, 3B), a lip groove steel is usually used.
As for the size of the first reinforcing bracket 3 (3A, 3B), for example, the length (width) of the upper part (upper base) is 350 mm, and the length (width) of the lower part (lower base) is, for example, Although it is 150 mm and height is about 200 mm, it is not limited to this.
As the first reinforcing metal fitting 3 (3A, 3B), a lip groove steel having a thickness of 3.2 mm and a maximum height when viewed from the side of 75 mm is usually used. Is not to be done.

A pair of the first reinforcing metal fittings 3 (3A, 3B) as described above are fixed to the left and right sides of the opening 1 so as to contact one side surface of the foundation concrete 2, for example, the front side surface.
As shown in FIG. 4, a post-construction anchor 6 is used to fix the first reinforcing bracket 3 (3A, 3B). Reference numeral 7 denotes a washer.
As the post-construction anchor 6, a hard edge anchor (trade name, manufactured by Sanko Techno Co., Ltd.), which is a high-strength screw fixing type anchor, is preferably used.
In order to fix the post-construction anchor 6, a post-construction anchor mounting hole 8 is formed in the first reinforcing bracket 3 (3 </ b> A, 3 </ b> B). FIG. 5 is a front view showing an example of the first reinforcing metal fitting 3 (3A, 3B).
In FIG. 5, the post-installation anchor mounting holes 8 are shown at three positions on the flat plate portion of the first reinforcing bracket 3 (3A, 3B). The number is not limited to this.
As shown in FIG. 1, the first reinforcing metal fittings 3 (3 </ b> A, 3 </ b> B) are located on both the left and right sides of the opening 1 and slightly below the upper end of the foundation concrete 2. 3 (3A, 3B) is preferably fixed horizontally so that the upper end comes to be excellent in strength.

Further, the first reinforcing metal fittings 3 (3A, 3B) are placed on the upper side of the first reinforcing metal fitting 3 (3A, 3B), and the second reinforcing metal fitting 4 is longer than the lateral width of the opening 1. The connection is fixed while securing the passage in the opening 1.
As shown in FIG. 1, the second reinforcing metal fitting 4 has a horizontally long shape that is longer than the width of the opening 1.
As an example of the size of the second reinforcing metal fitting 4, FIG. 1 shows a vertical (height) of 100 mm and a horizontal (width) of 850 mm. However, the present invention is not limited to this. What is necessary is just to determine suitably considering the magnitude | size of the part 1, etc. FIG.
As this 2nd reinforcement metal fitting 4, although the maximum height when it sees from the side which consists of a lip groove steel with a thickness of 3.2 mm is used, it is not limited to this. Absent.
FIG. 6 is a front view showing an example of the second reinforcing metal fitting 4.
The material of the 2nd reinforcement metal fitting 4 is not restricted to stainless steel, iron, etc., The rust prevention process, such as galvanization, may be given.
Further, as the second reinforcing metal fitting 4, as in the case of the first reinforcing metal fitting 3 (3A, 3B), the one having a substantially U-shaped cross section is used, but particularly as shown in FIG. In addition, a lip groove shape that is a shape in which the end portion is further folded inward is preferable because it can be made thinner and more lightweight. Therefore, as the second reinforcing metal fitting 4, lip groove steel is usually used.

In such a second reinforcing metal fitting 4, the first reinforcing metal fittings 3 (3 </ b> A, 3 </ b> B) are connected and fixed while ensuring passage through the opening 1.
The first and second reinforcing brackets 3 (3A, 3B) and the second reinforcing bracket 4 are connected and fixed by connecting the upper surface of the first reinforcing bracket 3 (3A, 3B) and the lower surface of the second reinforcing bracket 4 to each other. This is done by connecting and fixing with bolts 9.
For this purpose, bolt mounting holes 10 are formed at corresponding positions on the upper surface of the first reinforcing bracket 3 (3A, 3B) and the lower surface of the second reinforcing bracket 4, respectively. A bolt 9 is inserted into 10 and fixed with a nut (not shown). Although FIG. 1 shows a state in which two pairs of bolts 9 are inserted on the left and right, it is not limited to this. As the bolt 9, a full screw bolt is usually used.

Here, in order to ensure the passage through the opening 1, the first reinforcing brackets 3 (3 </ b> A, 3 </ b> B) are arranged so that the lower ends of the second reinforcing brackets 4 are slightly below the upper ends of the foundation concrete 2. And, the upper end of the second reinforcing bracket 4 is connected and fixed by the second reinforcing bracket 4 so that it is slightly above the upper end of the foundation concrete 2.
In FIG. 1, the second reinforcing metal fitting 4 is arranged so that the lower end thereof is about 50 mm below the upper end of the foundation concrete 2. In this case, the upper end of the second reinforcing metal fitting 4 is arranged to be approximately 50 mm above the upper end of the foundation concrete 2. Therefore, considering the case where the width of the opening 1 is 450 mm and the height is 300 mm, the size of the passage remaining after the connection and fixing is 450 mm in width and 250 mm in height, and passage in the opening 1 is ensured. . It should be noted that the height of the opening 1 can be slightly larger than 300 mm within a range that does not impair the strength.

Furthermore, a third reinforcing metal fitting 5 made of a metal member that is longer than the lateral width of the opening 1 is provided on one side of the foundation concrete 2 between the lower end of the opening 1 and the lower end of the foundation concrete 2, for example, the front side. Is fixed horizontally.
As shown in FIGS. 1 and 7, the third reinforcing metal fitting 5 is a horizontally long flat plate. For example, the size is a metal member having a thickness of 3 mm, and the length (height) is 50 mm and the width (width) is 1000 mm, but the length is longer than the width of the opening 1. It is not limited to this as long as it has a long horizontal length.
The material of the 3rd reinforcement metal fitting 5 is not restricted to stainless steel, iron, etc., The rust prevention process, such as galvanization, may be given.

As shown in FIG. 4, a post-construction anchor 6 and a washer (washer) 7 are used to fix the third reinforcing metal fitting 5.
As the post-construction anchor 6, a hard edge anchor (trade name, manufactured by Sanko Techno Co., Ltd.), which is a high-strength screw fixing type anchor, is preferably used.
In order to fix the post-construction anchor 6, a post-construction anchor attachment hole 8 is formed in the third reinforcing metal fitting 5. In FIG. 1, the post-installation anchor attachment holes 8 are formed at three locations on the flat plate portion of the third reinforcing metal fitting 5, but are not limited to three locations. Up to about seven places can be formed.
FIG. 7 is a front view showing an example of the third reinforcing metal fitting 5.

  The third reinforcing metal fitting 5 is fixed to one side surface of the foundation concrete 2 between the lower end of the opening 1 and the lower end of the foundation concrete 2, for example, the front side surface, in the left-right direction, but preferably at the lower end of the opening 1. It is preferable to fix in a close position, particularly when it is fixed horizontally so that the upper end of the third reinforcing metal fitting 5 comes to the position where the lower end of the opening 1 passes as shown in FIG.

  The first aspect of the present invention relating to the reinforcing structure of the basic concrete made of reinforced concrete is as described above.

Next, the second aspect of the present invention will be described.
The second aspect of the present invention is a reinforcing structure for unreinforced basic concrete having an opening serving as a passage, and the first reinforcement is in contact with one side surface of the basic concrete on both the left and right sides of the opening. A pair of metal fittings are fixed, and the first reinforcing metal fittings are mounted on the upper side of the first reinforcing metal fittings, and the second reinforcing metal fitting is longer than the lateral width of the opening. And connecting and fixing while securing the passage in the third side, and a third side made of a metal member longer than the lateral width of the opening on one side surface of the foundation concrete between the lower end of the opening and the lower end of the foundation concrete. And a fourth reinforcing bracket made of a metal member that is longer than the third reinforcing bracket, and the other side surface different from the reinforced foundation concrete. , The lower end of the opening and Between the lower end of the foundation concrete, a long metal member is used alone or in combination with a plurality of strips to form a band, and a fifth reinforcing bracket is installed over the entire lateral width of the other side surface. A sixth reinforcing metal fitting made of a single metal member or a plurality of metal members joined together to form a belt shape is installed over the entire lateral width of the other side surface across the opening.
The second aspect of the present invention will be described below in detail with reference to the drawings. FIG. 8 is a front view showing an example of the second aspect of the present invention, and FIG. 9 is an explanatory sectional view thereof. FIG. 10 is a rear view thereof.

The 2nd aspect of this invention is the reinforcement structure of the unreinforced basic concrete 2 which has the opening part 1 used as a channel | path.
In the second aspect of the present invention, the contents of the first reinforcing metal fitting, the second reinforcing metal fitting, and the third reinforcing metal fitting, and the contents of how to reinforce them, are described in the first aspect of the invention. The contents are the same as those described in FIG.
In the second aspect of the present invention, a fourth reinforcing metal fitting, a fifth reinforcing metal fitting, and a sixth reinforcing metal fitting are further added because it is a reinforcement structure of unreinforced basic concrete 2. In other words, the second aspect of the present invention is the same as the first aspect of the present invention described above except that a fourth reinforcing bracket, a fifth reinforcing bracket, and a sixth reinforcing bracket are added. Things can be said.

In the second aspect of the present invention, first, similarly to the third reinforcing bracket 5, the fourth reinforcing bracket 11 is provided on one side of the foundation concrete 2 between the lower end of the opening 1 and the lower end of the foundation concrete 2. Although fixed to the side surface, for example, the front side surface in the left-right direction, usually, as shown in FIG. 8, one side surface of the foundation concrete 2 between the third reinforcing bracket 5 and the lower end of the foundation concrete 2, For example, it is fixed to the front side surface over the left-right direction.
The fourth reinforcing metal fitting 11 is a horizontally long flat plate like the third reinforcing metal fitting 5, and its size is, for example, a metal member having a thickness of 6 mm. Although the length (height) is 50 mm and the width (width) is 2300 mm, the length is longer than the width of the opening 1 (the width is longer), and the third reinforcing metal fitting 5 It is formed longer than. Thereby, the unreinforced basic concrete 2 can be effectively reinforced. The material of the fourth reinforcing bracket 11 is not limited to stainless steel, iron, or the like, as with the third reinforcing bracket 5, and may be subjected to rust prevention treatment such as galvanization.

In the second aspect of the present invention, as the fourth reinforcing metal fitting 11, a part or the whole of a long and strip-shaped metal member is overlapped or thick (for example, about 5 to 7 mm thick). ) Is preferably formed of a metal member. In FIG. 8, a metal member having a thickness of 6 mm and having a length (height) of 50 mm and a width (width) of 2300 mm was used and fixed with a hard edge anchor. Although it is preferable to use a single plate having a width of 2300 mm, the plate may have a width of 2300 mm by connecting plates having a length of 1000 mm and a thickness of 6 mm, but is not necessarily limited thereto.
As shown in FIG. 4, a post-installed anchor 6 and a washer (washer) 7 are used for fixing the fourth reinforcing bracket 11, as in the case of the third reinforcing bracket 5. Is preferably a hard edge anchor (trade name, manufactured by Sanko Techno Co., Ltd.), which is a high-strength screw fixing type anchor.
Further, in order to fix using the post-construction anchor 6, the fourth reinforcing bracket 11 has a plurality of post-construction anchor mounting holes 8, for example, as shown in FIG. , 17 locations. However, the number of formation is not limited to this.

Next, in the second aspect of the present invention, because it is a reinforcement structure of unfounded basic concrete 2, as shown in FIG. Reinforcement is also performed on the side surfaces (if the reinforcement is on the front side surface, the back side surface).
That is, in the second aspect of the present invention, a long metal is on the other side surface different from the reinforced foundation concrete and between the lower end of the opening 1 and the lower end of the foundation concrete 2. The fifth reinforcing bracket 12 made of a single member or a plurality of members joined together in a band shape is installed over the entire lateral width of the other side surface, and a long metal member is attached alone or in combination to form a belt shape. The sixth reinforcing metal fitting 13 made of the above-mentioned material is installed across the entire width of the other side face across the opening 1.

The fifth reinforcing metal fitting 12 is made of a long metal member that is a single metal (single sheet) or a plurality of metal members that are joined together to form a belt shape.
Here, when a long metal member is used alone (one piece) as the fifth reinforcing metal fitting 12, it can be formed by overlapping a part or all of the metal members. In FIG. 10, as the fifth reinforcing metal fitting 12, a plate having a length (height) of 50 mm and a width (width) of 1000 mm made of a metal member having a thickness of 6 mm is connected over the entire width. Although a metal plate having a height (height) of 50 mm, a width (width) of 200 mm, and a thickness of 6 mm is placed at three joints of the plate, and a part thereof has a double structure, it is not necessarily limited to this. Is not to be done.
On the other hand, if the fifth reinforcing metal member 12 is formed by joining a plurality of long metal members into a band shape, the joint part can be made into a double structure, thereby improving the structural performance. can do. For example, by placing a metal member shorter than this (for example, vertical (height) 50 mm, horizontal (width) 200 mm, thickness 6 mm) on the joint between adjacent metal members, the joint The portion may have a double structure, or the end of adjacent metal members may be partially overlapped so that the joint portion has a double structure. In this case, what is necessary is just to fix using a construction anchor from on the piled-up metal member.
Furthermore, as the fifth reinforcing metal fitting 12, it is preferable that the portion close to the lower end of the opening 1 has a double structure in which two metal members are stacked. In addition, it may be thicker by that amount.

The sixth reinforcing bracket 13 is also composed of a long metal member (single sheet) or a band formed by joining a plurality of metal members, and is the same as the fifth reinforcing bracket 12 described above.
When a long metal member is used alone (one piece) as the sixth reinforcing metal fitting 13, it is formed by overlapping a part or all of the long and belt-like metal member. Can do.
In addition, when the sixth reinforcing metal fitting 13 is formed by joining a plurality of long metal members into a band shape, the joint portion can have a double structure, thereby improving the structural performance. can do.
However, the sixth reinforcing metal fitting 13 is installed across the entire width of the other side face across the opening 1. The sixth reinforcing fitting 13 cannot be physically installed in the opening 1, but is installed so as to be continuous except for the opening 1.
In FIG. 10, a metal member having a thickness of 3 mm and having a length (height) of 50 mm and a width (width) of 1300 mm and a metal member having a thickness of 3 mm and a length (height) of 50 mm and width (width). ) Using a 1775 mm metal plate, a metal plate having a vertical (height) of 50 mm, a horizontal (width) of 200 mm, and a thickness of 3 mm is placed at each joint at one joint, and a part of the double plate structure is shown. However, it is not necessarily limited to this.
Thus, in the second aspect of the present invention, the other side surface different from the one side surface of the reinforced foundation concrete 2 (the side surface on the back side if the reinforced surface is the front side surface). There is also reinforcement.
The second aspect of the present invention relating to the reinforcing structure of the unreinforced basic concrete 2 is as described above.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited to this.

Reference Example 1-1 (Strength test of fabric foundation made of reinforced concrete having openings: compression side)
As shown in FIG. 11, a fabric foundation (width 3600 mm, height 600 mm, thickness 140 mm) made of reinforced concrete having an opening 1 (width 450 mm, height 300 mm) on the upper side; upper and lower main bars: D13, SD295; , @ 300, SD295), two abutments 14 were placed on the lower side, and a bending shear strength test was performed by applying force from above as shown in FIG.
Table 1 shows the load at the maximum proof stress (Pmax) and the state of failure.

Reference Example 1-2 (Strength test of fabric foundation made of reinforced concrete with openings: tension side)
As shown in FIG. 12, a fabric foundation (width 3600 mm, height 600 mm, thickness 140 mm) made of reinforced concrete having an opening 1 (width 450 mm, height 300 mm) on the lower side opposite to the reference example 1-1. ; Vertical main muscles: D13, SD295; stirrup muscles: D10, @ 300, SD295), two abutments 14 are placed on the lower side, and a bending shear strength test is performed by applying force from above as shown in FIG. It was.
Table 1 shows the load at the maximum proof stress (Pmax) and the state of failure.

Example 1-1 (Reinforcement of foundation concrete made of reinforced concrete having openings according to the first aspect of the present invention: compression side)
As shown in FIG. 1, foundation concrete 2 (width 3600 mm, height 600 mm, thickness 140 mm) made of reinforced concrete having an opening 1 (width 450 mm, height 300 mm) on the upper side; upper and lower main bars: D13, SD295; D10, @ 300, SD295), the reinforcement according to the present invention is performed as shown in FIG. 1, then two abutments 14 are placed on the lower side, and bending shear is applied from above as shown in FIG. A strength test (upper opening) was performed.
Table 1 shows the load at the maximum proof stress (Pmax) and the state of failure.

Here, the reinforcement according to the first aspect of the present invention was performed as follows.
First, as Example 1-1, the upper (upper bottom) length (width) is 350 mm, the lower (lower base) length (width) is 150 mm, and the height is 200 mm. A pair of left and right lip groove steels having a thickness of 3.2 mm and a maximum height when viewed from the side of 75 mm (FIG. 5). reference).
Next, as the second reinforcing metal fitting 4, the maximum height when viewed from the side, which is made of a lip groove steel having a length (height) of 100 mm and a width (width) of 850 mm and a thickness of 3.2 mm, A 50 mm one was prepared (see FIG. 6).
Further, a steel plate made of stainless steel having a vertical (height) of 50 mm, a horizontal (width) of 1000 mm, and a thickness of 3 mm was prepared as the third reinforcing metal fitting 5 (see FIG. 7).

And the foundation concrete 2 (width 3600mm, height 600mm, thickness 140mm) which consists of a reinforced concrete which has the opening part 1 (width 450mm, height 300mm) on the upper side; upper and lower main bars: D13, SD295; About the one side surface (front side surface) of SD295), the first reinforcing metal fitting 3 (3A) is located 50 mm below the upper end of the foundation concrete 2 and on both sides (both sides) of the opening 1 so that the upper end is located. 3B) are placed in contact with each other. After that, hard edge anchors as post-construction anchors 6 are provided from the surface of the foundation concrete 2 to the three post-construction anchor attachment holes 8 provided in advance in the first reinforcing bracket 3 (3A, 3B). Each was fixed by being screwed into the interior (a pilot hole previously drilled to a predetermined size).
Next, the second reinforcing metal fitting 4 was placed so that the lower surface of the pair of first reinforcing metal fittings 3 (3A, 3B) fixed in this manner was in contact with the upper surface. Bolt mounting holes 10 are formed in the upper surface of the first reinforcing metal fitting 3 (3A, 3B) and the lower surface of the second reinforcing metal fitting 4 at the corresponding positions in advance. Bolts 9 were inserted into (a total of four places) and fixed with nuts.
Further, in this way, the first reinforcing metal fitting 3 (3A, 3B) and the second reinforcing metal fitting 4 are connected and fixed on the same side as the lower end of the opening 1 of the foundation concrete 2, and the lower end threading The third reinforcing metal fitting 5 is horizontally arranged at the position, and hard edge anchors are provided as post-installing anchors 6 in the three post-installing anchor mounting holes 8 provided in advance in the third reinforcing metal fitting 5. The base concrete 2 was fixed by screwing from the surface of the foundation concrete 2 into the interior (prepared holes that had been drilled to a predetermined size).

Example 1-2 (Reinforcement of basic concrete made of reinforced concrete having an opening according to the first aspect of the present invention: tension side)
As shown in FIG. 13, the fabric foundation reinforced in the same manner as in Example 1-1 is turned over, and the opening portion 1 (width 450 mm, height 300 mm) on the lower side is opposite to that in Example 1-1. For a fabric foundation made of reinforced concrete having a width of 3600 mm, a height of 600 mm, a thickness of 140 mm; upper and lower main bars: D13, SD295; ribbed bars: D10, @ 300, SD295, two abutments 14 are placed on the lower side. As shown in FIG. 13, a bending shear strength test in which force was applied from above was performed.
Table 1 shows the load at the maximum proof stress (Pmax) and the state of failure.

Comparative Example 1-1 (Reinforcement of basic concrete made of reinforced concrete having openings: compression side)
As shown in FIG. 14, in Example 1-1, the cloth reinforced by the first reinforcing bracket 3 (3 </ b> A, 3 </ b> B) and the second reinforcing bracket 4 without using the third reinforcing bracket 5. The foundation was subjected to a bending shear strength test in which two abutments 14 were placed on the lower side and applied from above as shown in FIG.
Table 1 shows the load at the maximum proof stress (Pmax) and the state of failure.

Comparative Example 1-2 (Reinforcement of basic concrete made of reinforced concrete having openings: tension side)
As shown in FIG. 15, the fabric base reinforced in the same manner as Comparative Example 1-1 is turned over, and the opening 1 (width 450 mm, height 300 mm) on the lower side is opposite to that of Comparative Example 1-1. Bending shear strength test in which two abutments 14 were placed on the lower side and applied from above as shown in FIG.
Table 1 shows the load at the maximum proof stress (Pmax) and the state of failure.

＊なお、比較例１−２は、試験体施工時に曲げひび割れが発生していた。

* In Comparative Example 1-2, bending cracks occurred when the test specimen was applied.

In addition, most fabric foundations made of unreinforced concrete are cracked due to drying shrinkage or aging deterioration, and the load (Pmax) at the maximum proof stress is 0 kN.
In addition, the proof strength of the fabric foundation made of reinforced concrete was calculated using the following formula of the Architectural Institute of Japan. As a result of calculation for the standard of the reinforcing bar, as shown in Table 3 below, the required yield strength (necessary yield strength I) of 21.5 kN was obtained.
Furthermore, in order to further improve the safety of the product, the required yield strength (necessary yield strength II) was determined using the yield point of the actual steel (main reinforcement).
As a result, the required proof stress II (Pmax) = (0.9 × 127 × 325 × 545) × 4/3000 = 27.1 kN, and if there was a maximum load of 27.1 kN or more, the reinforcing effect was sufficient. I can say that.

  Therefore, all the reinforced specimens (Examples and Comparative Examples) satisfied the required proof stress I (21.5 kN or more), but the positions of the openings were required proof stress II ( It was found that only the example (the present invention) satisfied 27.1 kN or higher. In other words, in the case of the comparative example in which the first reinforcing metal fittings 3 (3A, 3B) and the second reinforcing metal fitting 4 are reinforced without using the third reinforcing metal fitting 5, the push-up is particularly performed from below. (Tensile side: 23.4 kN) was not very strong.

[Basic calculation formula]
In the design of a house cloth foundation that is generally performed, the footing portion is designed to handle ground reaction force, and the remaining underground beam portion is designed to expect bending strength. It is common to use atypical reinforcing bar 1-D13 for the upper and lower main bars of the fabric foundation of a two-story house. The ultimate strength (M _max ) of the reinforcing bar shown in FIG. 16 is generally calculated by the following equation (1). When applying the following formula (1), the standard of the reinforcing bar becomes a problem. For atypical rebar, (at the end of the numeric reference intensity F, the unit is ^{N / mm 2) SD235, SD295} , SD345 are primarily entering the market, it is considered that many of the most usage SD235 So this was used.

_{· M y = 0.9a t · δ} y · d ··· (1)

Where a _t is the tensile main reinforcement cross-sectional area, [delta] _y was 1.1 times the F value at the yield point of the main reinforcement. d indicates an effective cause (d = D−d ₁ ).
Symbols D, d _{1 and} D ₁ are dimensions shown in Table 2.

When the ultimate strength M _max of the fabric foundation whose standard (material) is SD235 is calculated using atypical reinforcing bar 1-D13 for the upper and lower main bars, the M _max column in the following table 3 is the expected strength at the structural design. It is a moment.

In the experiment, a load is applied to the center of the test piece having the test section length L = 3000 mm shown in FIG. At this time, when the maximum bending moment M _max at the center of the test body is converted to the load P, Equation (2) is obtained.

・ P = 4 ・ M _max / L (2)

  Table 4 was obtained by converting the ultimate proof stress from moment to load with the test section L = 3000 mm. P in Table 4, that is, 21.5 kN, is a load expression of the ultimate strength expected in the structural design.

  According to these results, it can be seen that the first aspect of the present invention can effectively reinforce foundation concrete made of reinforced concrete having openings.

Example 2-1 (Reinforcement of unreinforced basic concrete having openings according to the second aspect of the present invention: compression side)
As shown in FIG. 8, as shown in FIG. 8, a non-reinforcing foundation concrete 2 (width 3600 mm, height 600 mm, thickness 140 mm) having an opening 1 (width 450 mm, height 300 mm) on the upper side is used. The reinforcement according to the invention was performed, and then two abutments were placed on the lower side, and a bending shear strength test (upper opening) was applied from above as shown in FIG.
The load (Pmax) at the maximum proof stress of this product was 31.7 kN.

Here, the reinforcement according to the second aspect of the present invention was performed as follows.
First, it has a shape that forms an approximately inverted trapezoidal shape (or an approximately inverted jump box shape) with an upper (upper base) length (width) of 350 mm, a lower (lower base) length (width) of 150 mm, and a height of 200 mm. A pair of left and right lip groove steels having a thickness of 3.2 mm and a maximum height when viewed from the side of 75 mm was prepared (see FIG. 5).
Next, as the second reinforcing metal fitting 4, the maximum height when viewed from the side, which is made of a lip groove steel having a length (height) of 100 mm and a width (width) of 850 mm and a thickness of 3.2 mm, A 50 mm one was prepared (see FIG. 6).
Further, as the third reinforcing metal fitting 5, a vertical (height) 50 mm, a horizontal (height) having the same outer shape as that shown in FIG. 7 except that post-installation anchor mounting holes 8 are provided at seven locations. A steel plate made of stainless steel having a width of 1000 mm and a thickness of 3 mm was prepared.
Further, as the fourth reinforcing metal fitting 11, a metal member (stainless steel) having a thickness of 6 mm and having a length (height) of 50 mm and a width (width) of 2300 mm was used and fixed with a hard edge anchor. This was provided with post-installation anchor mounting holes 8 at a total of 17 locations.
Next, as the fifth reinforcing metal fitting 12, a plate having a length (height) of 50 mm and a width (width) of 1000 mm made of a metal member (stainless steel) having a thickness of 6 mm was combined to be 3330 mm. A metal plate having a vertical (height) of 50 mm, a horizontal (width) of 200 mm, and a thickness of 6 mm was placed at three joints of the plate, and a part thereof having a double structure was prepared.
Furthermore, as the sixth reinforcing metal fitting 13, a metal member (stainless steel) having a thickness of 3 mm, a metal member (stainless steel) having a length (height) of 50 mm, a width (width) of 1300 mm, and a thickness of 3 mm. Steel) having a length (height) of 50 mm and a width (width) of 1775 mm was used and fixed with a hard edge anchor.

And about the one side surface (front side surface) of the foundation concrete 2 (width 3600mm, height 600mm, thickness 140mm) which consists of unreinforced concrete which has the opening part 1 (width 450mm, height 300mm) on the upper side, the foundation concrete 2 A pair of first reinforcing metal fittings 3 (3A, 3B) were placed in contact with each other at positions on both sides (both sides) of the opening 1 at a position 50 mm below the upper end. After that, hard edge anchors as post-construction anchors 6 are provided from the surface of the foundation concrete 2 to the three post-construction anchor attachment holes 8 provided in advance in the first reinforcing bracket 3 (3A, 3B). Each was fixed by being screwed into the interior (a pilot hole previously drilled to a predetermined size).
Next, the second reinforcing metal fitting 4 was placed so that the lower surface of the pair of first reinforcing metal fittings 3 (3A, 3B) fixed in this manner was in contact with the upper surface. Bolt mounting holes 10 are formed in the upper surface of the first reinforcing metal fitting 3 (3A, 3B) and the lower surface of the second reinforcing metal fitting 4 at the corresponding positions in advance. Bolts 9 were inserted into (a total of four places) and fixed with nuts.
Furthermore, the lower end of the opening portion 1 of the foundation concrete 2 on the same side as the third reinforcing bracket 5 is connected and fixed to the first reinforcing bracket 3 (3A, 3B) and the second reinforcing bracket 4 in this way. Lower, horizontally disposed at the position of the lower end thread of the opening 1 [the point where the distance from the center of the vertical (height) of the third reinforcing bracket 5 to the lower end of the foundation concrete 2 is 275 mm] Then, hard edge anchors as post-construction anchors 6 are inserted into the three post-installation anchor mounting holes 8 provided in advance in the third reinforcing metal fitting 5 from the surface of the foundation concrete 2 (predetermined size). It was fixed by screwing each into a prepared hole).
Further, the fourth reinforcing bracket 11 is placed between the third reinforcing bracket 5 and the lower end of the foundation concrete 2 [from the position of the center of the vertical (height) of the fourth reinforcing bracket 11 to the lower end of the foundation concrete 2. Is located horizontally at a distance of 175 mm], and is placed on a place approximately 200 mm inside from each of the left and right ends, and a thick metal plate (vertical (height) 50 mm, horizontal (width) 200 mm, thickness 6 mm ( A plate made of stainless steel), part of which has a double structure, a total of 17 post-installation anchor mounting holes 8, hard edge anchors as post-construction anchors 6, and the inside from the surface of the foundation concrete 2 It was fixed by screwing each into (a pilot hole that had been opened to a predetermined size in advance).
Next, the fifth reinforcing bracket 12 is a side surface (back side surface) that is different from the side surface that has been reinforced as described above, and the vertical (height) of the fifth reinforcing bracket 12 from the lower end of the foundation concrete 2. At the point where the distance to the center position is 175 mm, it is horizontally arranged over almost the entire lateral width of the side surface, and at the appropriate positions shown in FIG. 10, the vertical (height) is 50 mm, the lateral (width) is 200 mm, and the thickness is 6 mm. Three metal plates (plates made of stainless steel) are placed, part (3 places) has a double structure, and a total of 18 post-installation anchor mounting holes 8 and hard edges as post-construction anchors 6 The anchors were fixed by screwing them from the surface of the foundation concrete 2 into the interior (prepared holes that had been drilled to a predetermined size).
Furthermore, among the sixth reinforcing metal fittings 13, a metal member (stainless steel) having a thickness of 3 mm and having a length (height) of 50 mm and a width (width) of 1300 mm is shown on the left side of the opening in FIG. A metal member (stainless steel) having a thickness of 3 mm and having a length (height) of 50 mm and a width (width) of 1775 mm is arranged on the right side of the opening in FIG. It was installed above the fifth reinforcing bracket 12 so as to straddle the opening 1. In addition, the 6th reinforcement metal fitting 13 is horizontally arrange | positioned in the point where the distance from the upper end of the foundation concrete 2 to the center position of the length (height) of the 6th reinforcement metal fitting 13 is 80 mm, and a total of 16 places. A hard edge anchor as a post-construction anchor 6 was fixed to the post-construction anchor mounting hole 8 by screwing it into the inside (a pilot hole previously drilled in a predetermined size) from the surface of the foundation concrete 2.

According to the present invention, it is possible to effectively reinforce a foundation concrete having an opening opened at the time of renovation or ant-proof work without requiring a foundation with few construction procedures.
That is, according to the present invention, a foundation concrete having an opening opened when underfloor construction such as renovation or ant proofing construction is required without requiring a foundation, with few construction procedures. It is possible to return the strength above the level of foundation concrete without openings.
Therefore, according to the present invention, it is possible to avoid the possibility of reducing the strength of the wooden structure on the foundation concrete having the opening, although only a small construction procedure is required.

More specifically, according to the present invention, since only the reinforcement of the foundation is considered without the need for a foundation, a packing plate or an anchor bolt for integrating the foundation and the foundation is unnecessary. .
Also, in general, the construction includes fixing the first reinforcing brackets on both the left and right sides of the opening, connecting and fixing the first reinforcing brackets to each other with the second reinforcing bracket, and the width of the opening. Three steps of fixing the 3rd reinforcement metal fitting which consists of a long metal member to the lower surface of an opening part are sufficient, and it is excellent in workability.
And according to this invention, it has sufficient intensity | strength.
Therefore, according to this invention, the possibility of reducing the earthquake resistance of the wooden structure on the foundation concrete which has an opening part is avoided.
Therefore, the present invention is effectively used in the housing related industry.

DESCRIPTION OF SYMBOLS 1 Opening part 2 Foundation concrete 3 1st reinforcement metal fitting 4 2nd reinforcement metal fitting 5 3rd reinforcement metal fitting 6 Post-installation anchor 7 Washer (washer)
8 Post-installed anchor mounting hole 9 Bolt 10 Bolt mounting hole 11 Fourth reinforcing bracket 12 Fifth reinforcing bracket 13 Sixth reinforcing bracket 14 Abutment

Claims (7)

A reinforcing structure of a basic concrete made of reinforced concrete having an opening serving as a passage, wherein a pair of first reinforcing metal fittings abutting against one side surface of the basic concrete are fixed to the left and right sides of the opening, and The first reinforcing metal fittings are coupled and fixed while securing the passage in the opening with a second reinforcing metal that is longer than the lateral width of the opening placed on the upper side of the first reinforcing metal. A third reinforcing metal fitting made of a metal member that is longer than the width of the opening is fixed to one side surface of the foundation concrete between the lower end of the opening and the lower end of the foundation concrete. Reinforced structure of foundation concrete with openings. The first reinforcing brackets are arranged such that the lower end of the second reinforcing bracket is slightly below the upper end of the foundation concrete, and the upper end of the second reinforcing bracket is the upper end of the foundation concrete. The reinforcing structure according to claim 1, wherein the reinforcing structure is connected and fixed by the second reinforcing bracket so as to be slightly above. The reinforcing structure according to claim 1 or 2, wherein each of the first reinforcing bracket and the second reinforcing bracket has a lip groove shape in cross-sectional shape. The reinforcement structure in any one of Claims 1-3 which fixes a said 1st reinforcement metal fitting using a post-construction anchor. The reinforcing structure according to any one of claims 1 to 4, wherein the third reinforcing metal fitting is fixed using a post-construction anchor. A reinforcing structure of unreinforced basic concrete having an opening serving as a passage, wherein a pair of first reinforcing metal fittings that contact one side surface of the basic concrete are fixed to the left and right sides of the opening, and The first reinforcing metal fittings are coupled and fixed while securing the passage in the opening with a second reinforcing metal that is longer than the lateral width of the opening placed on the upper side of the first reinforcing metal. A third reinforcing metal fitting made of a metal member that is longer than the lateral width of the opening on one side surface of the foundation concrete between the lower end of the opening and the lower end of the foundation concrete, and the third A fourth reinforcing bracket made of a metal member that is longer than the reinforcing bracket is sequentially fixed, and is the other side surface different from the reinforced foundation concrete, and the lower end of the opening and the foundation Concrete Between the ends, a long metal member is used alone or in combination with a plurality of strips to form a band, and a fifth reinforcing bracket is installed over the entire lateral width of the other side surface. A reinforcing structure for foundation concrete having an opening, characterized in that a sixth reinforcing metal fitting made of a single or a plurality of pieces joined together is formed over the entire width of the other side face across the opening. . The reinforcing structure according to claim 6, wherein the fourth reinforcing metal fitting is formed by stacking two metal members or a thick metal member.

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