JP2020094438A - Method for reinforcing existing floor - Google Patents

Abstract

To provide a method for reinforcing an existing floor, which allows a desired reinforcing effect to be obtained by making it possible to make the thickness of the floor after reinforcement almost the same as that before reinforcement without increasing the thickness too much, and which does not require, regarding the support work for supporting the existing floor, a large-scale support and can omit the support work.SOLUTION: The method for reinforcing an existing floor 1 made of reinforced concrete reinforces by performing a first step of forming a floor surface having a plurality of first groove-shaped concave portions 2 and a plurality of remaining beam-shaped convex portions 3 alternately by scratching the top surface of the existing floor 1 in multiple grooves, a second step of placing reinforcing bars 4 inside the first groove-shaped concave portions 2 and placing a concrete 5 therein, a third step of scratching the beam-shaped convex portion 3 into a groove shape after the strength of the concrete 5 is developed and forming a plurality of second groove-shaped concave portions, and a fourth step of placing concrete by placing reinforcing bars inside the second groove-shaped concave portion.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for reinforcing an existing floor made of reinforced concrete.

As a method for reinforcing an existing floor made of reinforced concrete, conventionally, the top surface of the existing floor is scratched in a groove shape over a plurality of grooves, and a plurality of groove-shaped recesses and a plurality of grooves remaining between the groove-shaped recesses are used. After forming the floor surface that alternately has the beam-shaped convex portions of, the truss reinforcement is arranged inside the groove-shaped depression, and the reinforcement reinforcement for the additional part is arranged on the truss reinforcement to form the groove. There is known a method of reinforcing concrete by adding concrete to the entire upper surface of an existing floor including the inside of the concave portion (for example, refer to Patent Document 1).

Japanese Patent No. 3768488 (see particularly FIG. 4)

However, in the method described in Patent Document 1, since concrete is added and reinforced on the entire upper surface of the existing floor, that is, concrete for reinforcement is newly added and reinforced on the entire upper surface of the existing floor. There is no choice but to improve the thickness of the subsequent floor, which is unavoidably thicker than the thickness of the existing floor and, in some cases, more than double the thickness of the existing floor.

The present invention focuses on such conventional problems, and the purpose thereof is to make the thickness of the floor after reinforcement almost the same as that of the existing floor before reinforcement without increasing the thickness too much. In spite of this, it is possible to obtain a desired reinforcement effect, and also to provide support methods for existing floors that do not require much large-scale support work to support existing floors and can omit support work. To do.

A first characteristic configuration of the present invention is a method of reinforcing an existing floor for reinforcing an existing floor made of reinforced concrete, wherein the top surface of the existing floor is squeezed into a groove shape over a plurality of rows to form a plurality of first sections. A first step of forming a floor surface having a plurality of beam-shaped convex portions remaining between the groove-shaped concave portion and the first groove-shaped concave portion; and reinforcing bars arranged inside the first groove-shaped concave portion After the second step of casting concrete, and after the strength of the concrete cast in the first groove-shaped recess is manifested, the beam-shaped convex portion is carved into the groove shape, and the beam-shaped convex portion is placed at a corresponding position. To perform reinforcement by performing a third step of forming a plurality of second groove-shaped recesses and a fourth step of placing concrete by placing reinforcing bars inside the second groove-shaped recesses is there.

According to this configuration, reinforcing bars are arranged inside the both groove-shaped recesses of the first groove-shaped recess formed in the first step and the second groove-shaped recess formed in the third step, and concrete is poured. Therefore, in other words, since the existing floor will be reinforced over almost the entire area of the corresponding part, it is not necessary to make the thickness of the floor after reinforcement very large, and in some cases, the existing floor before reinforcement is not necessary. It is also possible to obtain a desired reinforcing effect with the same thickness as the above.
Then, while the first groove-shaped concave portion is formed and the first groove-shaped concave portion is reinforced, the plurality of beam-shaped convex portions remaining mainly between the first groove-shaped concave portions support the existing floor, While the second groove-shaped concave portion is formed at a position corresponding to the groove-shaped convex portion and the second groove-shaped concave portion is reinforced, the concrete which is mainly cast into the first groove-shaped concave portion and exhibits strength is The existing floors are supported by being arranged in a beam shape between the groove-shaped recesses. Therefore, as for the support work to support the existing floor, it does not require a large-scale support, and in some cases, the support work can be omitted. For example, the influence on the lower floors of the existing floor can be minimized. You can also

2nd characteristic structure of this invention WHEREIN: In the said 1st process, the said 1st groove-shaped recessed part is scratched to the arrangement|positioning area of the existing lower end streak embedded in the said existing floor, and the said 3rd process WHEREIN: The point is that the second groove-shaped recess is formed by removing the lower end streak.

According to this configuration, both the first groove-shaped concave portion and the second groove-shaped concave portion are formed by scooping up to the existing arrangement area of the lower end streak, and then reinforcing the existing lower end streak. The arrangement area will be surely reinforced, and the thickness of the floor after reinforcement can be suppressed as much as possible.

A third characteristic configuration of the present invention is that when the concrete is poured in the second step, the concrete is poured to a thickness that can withstand the concrete poured in the fourth step.

According to this configuration, when the concrete is poured into the first groove-shaped recess in the second step, the concrete is poured into a thickness that can withstand the execution of the fourth step. That is, the concrete is poured into the first groove-shaped recess. Since the concrete after being subjected to strength development is set to a thickness sufficient to support the existing floor in the state of being arranged in the beam shape between the second groove-shaped recesses, the existing floor is particularly supported by the support work. The first to fourth steps can be performed and reinforced without supporting.

A fourth characteristic configuration of the present invention is that, after the execution of the fourth step, a fifth step of placing concrete by placing reinforcing bars on the entire upper surface of the floor is executed.

According to this configuration, by performing the fifth step, for example, by adding an upper end streak, a further reinforcing effect of the existing floor can be obtained, and, in addition, for example, various devices are installed on the floor after the reinforcement. When installing, an anchor or the like for installing the device can be embedded.

A fifth characteristic configuration of the present invention is that the floor surface is made substantially flush by placing concrete in the fourth step.

According to this configuration, since the floor surface becomes substantially flush by the execution of the fourth step, as described above, when installing various devices on the floor after the reinforcement, the anchor or the upper end for installing the device is installed. The marking work required for arranging the reinforcing reinforcements such as reinforcements becomes easy.

A sixth characteristic configuration of the present invention is that when the concrete is poured in the fourth step, the concrete is poured to a thickness that can withstand the entire upper surface of the floor in the fifth step. It is in.

According to this configuration, when the second groove-shaped recess is reinforced in the fourth step, it is reinforced in advance so as to withstand the execution of the fifth step, and as a result, the existing floor is supported by the support work. Without it, the fifth step can be performed.
In particular, as described in connection with the third characteristic configuration, when reinforcing the first groove-shaped recess in the second step in advance so as to withstand execution of the fourth step, All steps up to the fifth step can be performed and reinforced without supporting work.

A seventh characteristic configuration of the present invention is that when concrete is poured in the fifth step, the concrete is poured so that the thickness of the floor after reinforcement is almost the same as that of the existing floor before reinforcement. ..

According to this configuration, when the concrete is poured in the fifth step, the concrete is poured so that the thickness of the floor after the reinforcement is almost the same as that of the existing floor before the reinforcement, so that the desired reinforcement effect is obtained. Despite being obtained, the floor thickness can be kept about the same as before reinforcement.

Schematic vertical sectional front view showing the first step of the method for reinforcing the existing floor Schematic vertical sectional front view showing the second step of the method for reinforcing the existing floor Schematic vertical sectional front view showing the third step of the existing floor reinforcement method Schematic vertical sectional front view showing the fourth step of the existing floor reinforcement method. Schematic vertical sectional front view showing the fifth step of the existing floor reinforcement method. The figure which shows the reinforcing-bar arrangement|positioning state in another embodiment.

An embodiment of a method for reinforcing an existing floor according to the present invention will be described with reference to the drawings.
The method for reinforcing an existing floor according to the present invention is a method for sequentially executing each of steps 1 to 5 described below to reinforce an existing floor made of reinforced concrete, and sequentially for steps 1 to 5. explain.

(First step)
In the first step, as shown in FIG. 1, the top surface of the existing floor 1 made of reinforced concrete is scraped into a groove shape over a plurality of rows to form a plurality of first groove-shaped recesses 2 and the first groove-shaped recesses thereof. A floor surface having a plurality of beam-shaped convex portions 3 remaining between the two is alternately formed.
The formation direction of the first groove-shaped concave portion 2 is not particularly limited, but for example, when the existing floor 1 is rectangular in plan view, it is preferable to form the first groove-shaped concave portion 2 in the direction along the short side of the existing floor 1. It is preferable to form the first groove-shaped recesses 2 so as to be substantially parallel to each other.
The depth of the first groove-shaped recess 2 is also not particularly limited, but as will be described later in detail, even if concrete 5 (see FIG. 2) is cast in the first groove-shaped recess 2 in the second step. It is preferable that the first groove-shaped concave portion 2 is formed by being able to withstand and, for example, scraping up to the arrangement area of the existing lower end streak (not shown) embedded in the existing floor 1. In short, the existing floor 1 is supported by the plurality of beam-shaped convex portions 3 that remain mainly between the first groove-shaped concave portions 2 until the concrete 5 is placed in the first groove-shaped concave portions 2 in the second step. Therefore, when forming the first groove-shaped concave portion 2, it is preferable to form the first groove-shaped concave portion 2 to such an extent that it can endure without supporting work in consideration of this point.
In addition, as a matter of fact, the number, width, arrangement pitch, depth, etc. of the first groove-shaped recesses 2 are the strength of the existing floor 1, the area and scale of the existing floor 1, the number of columns supporting the existing floor 1, and the like. It will be set as appropriate after taking into consideration all situations, such as the location, according to the actual site.

(Second step)
In the second step, as shown in FIG. 2, a large number of reinforcing bars 4 are newly arranged inside the first groove-shaped recess 2 formed in the first step, and concrete 5 is placed.
The reinforcing bars 4 are arranged along the length direction of each first groove-shaped recess 2 and also arranged in the direction orthogonal to the length direction, and as described above, up to the existing arrangement area of the lower end bars. In the case where the first groove-shaped recess 2 is formed by squeezing, if possible, the existing lower end bar is left to be laid out, and then the concrete 5 is poured.
The thickness of the concrete 5 to be cast in each first groove-shaped recess 2 is not particularly limited, but the thickness of the concrete 5 to be cast in the first groove-shaped recess 2 is taken into consideration in consideration of the existing reinforcing bars and reinforcing bars 4. As will be described later in detail, the concrete 5 after the strength has developed is formed with the second groove-shaped recess 6 (see FIG. 3) in the third step, and the concrete 5 is formed in the second groove-shaped recess 6 in the fourth step. (Refer to FIG. 4) It is preferable to set the thickness so that it can endure even when it is placed.
Further, the reinforcement bar 4 arranged in each first groove-shaped recess 2 in the concrete 5 not only reinforces the existing floor 1, but also in the fourth step, the concrete 5 is placed in the second groove-shaped recess 6. It is preferable to set it so that it can withstand even if installed.

(Third step)
In the third step, as shown in FIG. 3, after the strength of the concrete 5 cast in the first groove-shaped concave portion 2 in the second step is exerted, the beam-shaped convex portions 3 formed in the first step are scraped into a groove shape. Then, a plurality of second groove-shaped concave portions 6 are formed at the corresponding positions of the beam-shaped convex portions 3.
The depth of the second groove-shaped recess 6 is also not particularly limited, but as with the first groove-shaped recess 2 in the first step, as will be described later in detail, the second groove-shaped recess 6 is formed in the concrete in the fourth step. 5 (see FIG. 4) can be endured, and for example, it is preferable that the second groove-shaped recess 6 is formed by scraping up to the arrangement area of the existing lower end streak buried in the existing floor 1. ..
By the execution of this third step, a plurality of second groove-shaped concave portions 6 and a plurality of beam-shaped convex portions 7 (concrete cast in the first groove-shaped concave portions 2) located between the second groove-shaped concave portions 6 are formed. A floor surface having alternating beam-shaped projections formed by solidifying 5) is formed. Then, as will be described later in detail, the existing floor 1 is mainly placed between the second groove-shaped concave portions 6 until the concrete 5 (see FIG. 4) is placed in the second groove-shaped concave portions 6 in the fourth step. The plurality of remaining beam-shaped convex portions 7 will be supported.

(Fourth step)
In the fourth step, as shown in FIG. 4, a large number of reinforcing bars 4 are newly arranged inside the second groove-shaped recess 6 formed in the third step, and concrete 5 is placed.
As in the case of the first groove-shaped concave portion 2, the reinforcing bar 4 is arranged along the length direction of each second groove-shaped concave portion 6 and also arranged in the direction orthogonal to the length direction. When the second groove-shaped recess 6 is formed by scraping up to the arrangement area of the lower end reinforcements, if possible, the existing lower end reinforcements are left in place, and then concrete 5 is placed.
In addition, in the fourth step, the reinforcing bar 4 arranged inside the second groove-shaped recess 6 along the direction orthogonal to the lengthwise direction of the second groove-shaped recess 6 is the second step in the above-described second step. 1 mechanical joints, welding joints, and pressure joints to the reinforcing bars 4 (see FIG. 2) arranged inside the first groove-shaped recess 2 along a direction orthogonal to the longitudinal direction of the groove-shaped recess 2. And the like are connected by an appropriate joining means.

The thickness of the concrete 5 to be cast into each second groove-shaped recess 6 is not particularly limited, but the thickness of the concrete 5 to be cast into the second groove-shaped recess 6 is taken into consideration in consideration of the existing reinforcing bars and reinforcing bars 4. As will be described later in detail, the concrete 5 after the strength is developed is set to a thickness that can withstand the concrete 5 (see FIG. 5) cast on the entire upper surface of the floor in the fifth step. preferable.
By pouring the concrete 5 in the fourth step, the floor surface becomes almost flush, but it is not always necessary to make it flush.
Furthermore, the reinforcement bar 4 arranged in each second groove-shaped recess 6 in the concrete 5 not only reinforces the existing floor 1, but also in the fifth step, the concrete 5 is cast on the entire upper part of the floor surface. Even if it can withstand, it is preferable to set it.

(Fifth step)
In the fifth step, as shown in FIG. 5, after the execution of the fourth step, a large number of reinforcing bars 8 are newly arranged on the entire upper surface of the floor surface and the concrete 5 is poured.
Reinforcing bars 8 are arranged along the length direction of the first groove-shaped concave portion 2 and the second groove-shaped concave portion 6 such as upper end bars, and also in the direction orthogonal to the longitudinal direction such as upper end bars. When arranging and installing devices on the floor after reinforcement, if the floor surface is almost flush due to the execution of the fourth step, after the marking work, the anchor 9 for installing the device is placed. Then, concrete 5 is placed.
The thickness of the concrete 5 to be cast on the entire upper surface of the floor is not particularly limited, but it is preferable to cast it so that the thickness of the floor after reinforcement is almost the same as the existing floor 1 before reinforcement. preferable.
Note that the fifth step is not an indispensable step, and the fifth step can be omitted. In that case, for example, in the second step, concrete 5 is cast over the entire inside of the first groove-shaped recess 2 so as to be flush with the upper surface of the beam-shaped projection 3, and In the step, the concrete 5 is cast over the entire inside of the second groove-shaped recess 6 to make the floor surface substantially flush.

In the above embodiment, in each of the first groove-shaped recesses 2 (see FIG. 2) and in each of the second groove-shaped recesses 6 (FIG. 4), the lengthwise direction of the groove-shaped recesses 2 and 6 and the direction orthogonal to the lengthwise direction. Although the reinforcing bars 4 are arranged along both sides, as shown in FIG. 6, in the groove-shaped recesses 2 and 6, only the reinforcing bars 4A along the length direction are within a range in which necessary strength can be secured. Reinforcing bars that are arranged in a line and are orthogonal to the length direction may be omitted. This makes it possible to omit a joining means such as a mechanical joint for joining the reinforcing bars orthogonal to the length direction. Further, in this case, in the vicinity of directly above the concrete 5 cast in the fourth step, in other words, in the vicinity of the lower side of the concrete 5 cast in the fifth step, the groove-shaped recesses 2, 6 are orthogonal to the longitudinal direction. It is also possible to supplement the lack of strength by adding the reinforcing bar 4B along the direction in which the strength is increased.

1 Existing floor made of reinforced concrete 2 First groove-shaped concave portion 3 Beam-shaped convex portion 4 Reinforcing bars for reinforcing the first and second groove-shaped concave portions 5 Concrete 6 Second groove-shaped concave portion 8 Reinforcement for the entire upper surface of the floor Reinforcement

Claims (7)

A method of reinforcing an existing floor made of reinforced concrete, comprising:
The top surface of the existing floor is grooved over a plurality of lines, and a plurality of first groove-shaped recesses and a plurality of beam-shaped projections remaining between the first groove-shaped recesses are alternately provided. A first step of forming a floor surface,
A second step of placing concrete with reinforcing bars arranged inside the first groove-shaped recess;
After developing the strength of the concrete cast in the first groove-shaped recesses, the beam-shaped projections are scavenged into a groove shape, and a plurality of second groove-shaped recesses are formed at corresponding positions of the beam-shaped projections. 3 steps,
A fourth step of arranging reinforcing bars inside the second groove-shaped recesses and placing concrete, thereby reinforcing the existing floor. In the first step, the first groove-shaped concave portion is formed by scraping up to the arrangement area of the existing lower end streak embedded in the existing floor, and in the third step, scratching up to the arrangement area of the lower end streak. The method for reinforcing an existing floor according to claim 1, wherein the second groove-shaped recess is formed. The method for reinforcing an existing floor according to claim 1 or 2, wherein when concrete is poured in the second step, concrete is poured in a thickness that can withstand the concrete poured in the fourth step. The reinforcement of the existing floor according to any one of claims 1 to 3, wherein after the execution of the fourth step, a fifth step of placing concrete by placing reinforcing bars on the entire upper surface of the floor is executed. Method. The method for reinforcing an existing floor according to claim 4, wherein the floor surface is made substantially flush by pouring concrete in the fourth step. The existing floor according to claim 4 or 5, wherein at the time of pouring concrete in the fourth step, concrete is poured to a thickness that can withstand even concrete pouring on the entire upper surface of the floor in the fifth step. Reinforcement method. 7. When pouring concrete in the said 5th process, concrete is poured so that the thickness of the floor after reinforcement may become substantially the same thickness as the existing floor before reinforcement. Reinforcing existing floors.

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