JP2011140851A - Method for arranging foundation reinforcing bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for arranging foundation reinforcing bars by which the efficiency of arranging the reinforcing bars is improved as cutting work of the reinforcing bars is reduced, and excellent construction and economic efficiency are imparted, while reducing costs by raising the yield ratio of the reinforcing bars. <P>SOLUTION: The equal length reinforcing bars 2 are arranged into a square shape on the outer peripheral part of a footing 1 as lower end reinforcement of the footing 1 in an individual footing. Inside the footing 1, standard-size reinforcing bars 3 shorter than the reinforcing bars 2 on the outer peripheral part are arranged into a lattice-like shape while the standard-size reinforcing bars 3 are arranged alternately close to the reinforcing bars 2 on the outer periphery without cutting the standard-size reinforcing bars 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a basic bar arrangement method, in particular, a bar arrangement method for arranging a main bar of a footing on an independent foundation.

  Conventionally, in this type of basic bar arrangement method, as shown in FIG. 1B, for example, a rebar 2 having the same length is used as the lower end bar of the footing 1. These reinforcing bars 2 are arranged in a square shape on the outer periphery of the footing 1, and the inside of the footing 1 is the same so that uniform grids are formed over the entire area of the square formed by the reinforcing bars 2 on the outer periphery. The length of the reinforcing bars 2 was arranged in a lattice pattern at regular intervals.

However, the above-mentioned basic bar arrangement method has the following problems in terms of both workability and economy. That is, since the size (ground contact area) of the footing 1 on the independent foundation in plan view is calculated based on the load F ₁ from the superstructure and the supporting force F _{2 of the} ground, the length of one side of the footing 1 is Corresponding to this, the length of the reinforcing bar 2 used as the bottom bar of the footing 1 is also different for each construction site.

  Therefore, at present, the rebars brought in the field (this is a standard rebar prepared by a rebar manufacturer as a standard product of a standard item, and a deformed rebar with a large diameter of D16 or more is usually used as the main rebar of the footing. However, the efficiency of bar arrangement work and construction management is poor because it takes a lot of time and effort to accurately arrange the reinforcing bars. In addition, since the remaining cut cannot be used for reinforcing bars and becomes scrap, not only the yield of reinforcing bars is bad, but also the scrap processing is expensive.

  In addition, as a beam reinforcement method, when adopting a reinforcing bar with an enlarged head with an enlarged head at both ends as a beam main reinforcing bar with a different length at each site, an enlarged head is attached only to one end. Rebar manufacturers with diameter expanding heads prepared as standard products of several types of standard items by the reinforcing bar manufacturer, combining these rebar with expanded diameter heads with normal linear reinforcing bars, the required length Although the bar arrangement method used as a reinforcing bar with a diameter-expanded head is proposed by patent document 1, nothing is disclosed about the basic bar arrangement method.

JP 2009-161986

  The present invention has been made in view of the above-described present situation, and reduces the rebar alignment work to improve the work efficiency of the bar arrangement, improve the yield of the rebar amount, and reduce the cost. It aims at providing the basic bar arrangement method excellent in construction nature and economic efficiency.

  In order to achieve the above object, technical measures taken by the present invention are as follows. That is, in the basic bar arrangement method according to the first aspect of the present invention, as the main bar of the footing in the independent foundation, the same length of the reinforcing bar is arranged in a square shape at the outer periphery of the footing, It is characterized by using reinforcing bars shorter than the reinforcing bars in the part, and arranging these short reinforcing bars in a lattice pattern in such a way as to alternately approach the reinforcing bars in the outer peripheral part.

  The invention described in claim 2 is the basic bar arrangement method according to claim 1, characterized in that the short reinforcing bar is a standard reinforcing bar prepared by a reinforcing bar manufacturer as a standard product of a standard article.

  In the present invention, the standard rebar is a commercially available (ready-made) standard rebar that is standardized in a constant length increment (for example, 50 cm increments), and is manufactured to a desired length by requesting the rebar manufacturer. It is meant to include custom-made fixed-length reinforcing bars.

  According to the first aspect of the present invention, the reinforcing bars are arranged in a square shape in the outer periphery of the footing, but the reinforcing bars shorter than the reinforcing bars in the outer periphery are alternately brought close to the reinforcing bars in the outer periphery in the footing. In the center of the footing (near the upper column position), it is possible to secure the required amount of reinforcing bars as a conventional dense lattice, and yet in the vicinity of the outer periphery of the footing, One end of the short reinforcing bars arranged in a lattice pattern will be alternately located away from the outer peripheral reinforcing bars to the center side, and the reinforcing bars near the outer peripheral part of the footing will be regularly thinned out uniformly. Therefore, it is possible to reduce the cost by reducing the amount of reinforcing bars.

That is, since the strength of the independent footing is designed as a cantilever, as shown in FIG. 1A, the footing 1 has a load F ₁ from the upper structure and a supporting force F _{2 of the} ground. The closer to the upper column position P, the larger the bending moment M acts, and the bending moment M decreases as the end of the footing 1 is reached. Therefore, for example, if the necessary amount of reinforcing bars is arranged at the center side of the footing 1 (near the upper column position P) as the lower end of the footing 1, As shown in FIG. 1A, appropriate thinning with no bias in the bar arrangement density, in which reinforcing bars shorter than the outer reinforcing bars are alternately arranged in a lattice pattern so as to approach the outer reinforcing bars. On the other hand, there is no inconvenience in terms of strength, and the cost can be reduced by reducing the amount of reinforcing bars.

  In particular, according to the second aspect of the present invention, as the short reinforcing bar arranged inside the footing, the standard reinforcing bar prepared by the reinforcing bar manufacturer is used as it is as a standard product of the standard article, so the reinforcing bar is designated. The work of cutting to dimensions is omitted. That is, as shown in FIG. 1A, the reinforcing bars 2 arranged in a square shape around the outer periphery of the footing 1 are cut to a length corresponding to the length of one side of the footing 1 which is different for each construction site. In many cases, the reinforcing bars arranged inside the footing 1 are used as they are without cutting the fixed reinforcing bars 3 shorter than the reinforcing bars 2 on the outer peripheral portion. Therefore, by omitting the complicated and inefficient work of trimming the reinforcing bars, the work efficiency of the reinforcing bars is remarkably improved, and there is no uncut residue that becomes scrap, which can further reduce the cost. Yes, it has the effect of improving workability and economy.

It is a figure explaining the basic bar arrangement method concerning the present invention compared with the conventional example. It is a vertical side view which shows an example of the basic bar arrangement method which concerns on this invention. It is a top view explaining the basic bar arrangement method shown in FIG. It is a vertical side view which shows the other example of the basic bar arrangement method which concerns on this invention. It is a top view explaining the basic bar arrangement method shown in FIG.

As shown in FIG. 1 (A), the basic bar arrangement method according to the present invention arranges reinforcing bars 2 of the same length on the outer periphery of the footing 1 in a square shape as the lower bar of the footing 1 on the independent foundation. In the footing 1, a fixed reinforcing bar 3 shorter than the outer reinforcing bar 2 is used, and these fixed reinforcing bars 3 are alternately cut into the outer reinforcing bar 2 in a lattice pattern without cutting. It is characterized by the arrangement of the bars.

  Since the length of one side of the footing 1 varies from construction site to construction site, the length of the reinforcing bar 2 at the outer peripheral portion varies from construction site to construction site accordingly. For this reason, as the reinforcing bars 2 at the outer peripheral portion, fixed-length reinforcing bars (fixed-length reinforcing bars prepared by a reinforcing bar manufacturer as standard products of fixed-size articles) cut into a required length are used.

  According to the above configuration, the reinforcing bars 2 are arranged in a square shape on the outer peripheral part of the footing 1, but the fixed reinforcing bars 3 shorter than the reinforcing bars 2 on the outer peripheral part are alternately placed inside the footing 1. Since the bars are arranged in a grid pattern near the center of the footing 1 (near the upper column position P), it becomes a conventional dense grid-like bar arrangement and a necessary amount of reinforcing bars can be secured.

  In the vicinity of the outer periphery of the footing 1, one end of the short rebar 3 arranged in a lattice pattern is alternately positioned away from the outer periphery of the reinforcing bar 2 toward the center. Since the reinforcing bars are regularly thinned out uniformly, the cost can be reduced by reducing the amount of reinforcing bars.

That is, since the strength of the independent footing is designed as a cantilever, as shown in FIG. 1A, the footing 1 has a load F ₁ from the upper structure and a supporting force F _{2 of the} ground. The closer to the upper column position P, the larger the bending moment M acts, and the bending moment M decreases as the end of the footing 1 is reached. Therefore, as a lower end reinforcing bar of the footing 1, if a necessary amount of reinforcing bars are arranged on the center side of the footing 1 (near the upper column position P), even if the reinforcing bars are thinned at the end of the footing where the bending moment M is small, the thinning is performed. However, as shown in FIG. 1 (A), an appropriate thinning method that does not bias the bar arrangement density, such as arranging the short standard rebars 3 in a lattice pattern so as to alternately approach the reinforcing bars 2 on the outer periphery. If so, there is no inconvenience in terms of strength, and the cost can be reduced by reducing the amount of reinforcing bars.

  In particular, according to the above configuration, the fixed reinforcing bar 3 prepared by the reinforcing bar manufacturer as a standard product of the fixed scale is used as it is as a short reinforcing bar arranged inside the footing 1, so that the operation of cutting the reinforcing bar is performed. Will be omitted. That is, as shown in FIG. 1 (A), with respect to the reinforcing bars 2 arranged in a square shape on the outer periphery of the footing 1, the length of one side of the footing 1 which differs depending on the construction site in almost all independent foundations. Although the operation | work cut | disconnected to the corresponding length is needed, about the reinforcing bar arranged inside the footing 1, the fixed reinforcing bar 3 shorter than the reinforcing bar 2 of an outer peripheral part will be used as it is. Therefore, by omitting the complicated and inefficient work of trimming the reinforcing bars, the work efficiency of the reinforcing bars is remarkably improved, and there is no uncut residue that becomes scrap, which can further reduce the cost. Yes, it has the effect of improving workability and economy.

  For the rebar 3 shorter than the rebar 2 on the outer periphery of the footing 1, a commercially available (ready-made) rebar that is standardized with a fixed length (for example, 50 cm), and a rebar manufacturer are requested. However, in the illustrated embodiment, a commercially available (off-the-shelf) standard reinforcing bar is used in order to further improve the economic efficiency. Yes.

  2 and 3 show a specific example of the basic bar arrangement method according to the present invention. Reference numeral 1 denotes a footing on an independent foundation, which is constructed on abandoned concrete 5 cast on the improved ground 4. In the base part of the footing 1, only the lower end bars using the D16 deformed reinforcing bars are arranged. P indicates the position of the upper column.

The lower end of the footing 1 is slightly shorter than the outer side of the footing 1 corresponding to the length of one side of the base of the footing 1 (for example, 4,600 mm) (required concrete cover thickness is subtracted). The rebar 2 cut in the field is arranged in a quadrangular shape, and the footing 1 has a rebar that is shorter than the outer rebar 2 (for example, a rebar with a length of 4,000 mm). 3), the fixed reinforcing bars 3 are arranged in a lattice pattern so that they are alternately brought close to the outer reinforcing bar 2 without cutting. In FIG. 3, in order to show that the upper end bar of the footing 1 does not exist, the left half fixed bar 3 is not shown.

  FIG. 4 and FIG. 5 show an embodiment in which the lower end muscle and the upper end muscle (kama) 6 are arranged in the base portion of the footing 1. As the lower end bars, similarly to the embodiment of FIGS. 2 and 3, reinforcing bars 2 cut into a length corresponding to the length of one side of the base part of the footing 1 are arranged in a square shape on the outer periphery of the footing 1. Then, by arranging the rebars 3 shorter than the outer rebar 2 in the footing 1 in a lattice pattern so as to alternately approach the outer rebar 2 without cutting, the aligning operation and the rebar are performed. Although the amount is reduced, the upper end bars (stiles) 6 are arranged in a lattice pattern which is uniform from end to end and is coarse as usual.

  This is because the rebar diameter of D10, which is also a general-purpose material, is used as the top rebar (spindle) 6 and the rebar is easy to cut, and the lap joint is also simple. This is because there is no problem even if it is cut on site. In FIG. 5, in order to show that the upper end reinforcement (stile) 6 of the footing 1 is present, the top half (stile) 6 is shown in the left half, and the fixed reinforcing bar 3 is shown in the right half. It is. 1

  The foundation bar arrangement method according to the present invention is advantageous in terms of both workability and economic efficiency as the number of independent foundations is large and the size of the independent foundations is large. For example, for the construction of large-scale commercial facilities. Although it is particularly suitable, it can be used to construct any structure having an independent foundation such as a factory or an office building.

DESCRIPTION OF SYMBOLS 1 Footing 2 Reinforcement of outer periphery 3 Reinforcing bar shorter than outer reinforcement 4 Improved ground 5 Discarded concrete 6 Top reinforcement
F ₁ Load from superstructure F ₂ Ground support force M Bending moment P Upper column position

Claims (2)

  As the main reinforcement of the footing on the independent foundation, reinforcing bars of the same length are arranged in a square shape on the outer periphery of the footing, and these short reinforcing bars are used inside the footing by using reinforcing bars shorter than the reinforcing bars of the outer periphery. A basic bar arrangement method characterized by arranging bars in a lattice pattern alternately approaching the reinforcing bars on the outer periphery.   2. The basic reinforcing bar arrangement method according to claim 1, wherein the short reinforcing bar is a fixed reinforcing bar prepared by a reinforcing bar manufacturer as a standard product of a fixed object.

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