Jig for controlling covering thickness, and method for controlling covering thickness

Abstract

To provide a jig for controlling a covering thickness, which can be reused to control the covering thickness at low cost, and a method for controlling the covering thickness.SOLUTION: A jig 30 includes a rectangular flat jig plate 31. The jig plate 31 has only one cutout portion 35 opened in a long side portion 34a. In the jig plate 31, a distance between a short side portion 33a and the cutout portion 35 in a long side direction in which the long side portion 34a extends is set to a first dimension T1. The jig plate 31 is disposed between a pair of molds 42a and 42b installed on both sides of an upper end reinforcing bar 21. The cutout portion 35 is for allowing the upper end reinforcing bar 21 to enter while the short side portion 33a of the jig plate 31 is in contact with an inner surface of the mold 42a. A width of the cutout portion 35 is larger than a diameter of the upper end reinforcing bar 21 so that the upper end reinforcing bar 21 does not fit into the cutout portion 35.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a jig for managing the cover thickness of basic concrete and a method for managing the cover thickness using the jig to manage the cover thickness.

Background Art

[0002] The foundation of a building is made of reinforced concrete, and steel bars are embedded therein. In the foundation, horizontal steel bars extending in the longitudinal direction of the foundation are embedded as steel bars. The horizontal steel bars include upper end bars, lower end bars, web bars, etc.

[0003] In the foundation, in order to prevent the steel bars inside the concrete from rusting, it is required to manage the cover thickness of the concrete covering the steel bars to a predetermined dimension. Patent Document 1 discloses a jig for managing the cover thickness of a foundation having a double reinforcement structure. This jig is in a long shape having the same length dimension as the interval between a pair of formworks used for placing the basic concrete. Further, two hook portions having a concave shape are provided on the jig at an interval. The interval between these two hook portions is the same as the interval between two upper end bars arranged between a pair of formworks.

[0004] The jig of Patent Document 1 is attached to two upper end bars in a state where the two upper end bars are respectively inserted into the hook portions during the construction of the foundation. In this case, the jig is arranged between a pair of formworks, and both longitudinal ends thereof are respectively applied to the pair of formworks. Further, the jig is arranged at a plurality of locations in the longitudinal direction of the upper end bar.

[0005] In Patent Document 1, as described above, by attaching the jig to the two upper edge bars, the two upper edge bars are positioned at a predetermined position between a pair of formworks. As a result, the distance between the upper edge bar and the inner surface of the formwork can be controlled to a predetermined dimension, and consequently, the cover thickness of the concrete from the upper edge bar to the side surface of the foundation can be controlled to a predetermined dimension. Note that the jig is embedded and buried in the concrete, that is, in the foundation, when the concrete is placed between the pair of formworks.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] By the way, as described above, the jig of Patent Document 1 is buried in the foundation and thus cannot be reused. In addition, since a plurality of the jigs of Patent Document 1 are arranged in the longitudinal direction of the upper edge bar, the cost disadvantage due to the burying of those plurality of jigs is also large.

[0008] The present invention has been made in view of the above circumstances, and the main object thereof is to provide a jig for cover thickness management and a cover thickness management method that can perform cover thickness management at low cost by enabling reuse.

Means for Solving the Problems

[0009] To solve the above problems, the cover thickness management jig for the first invention is formed by embedding reinforcing bars inside concrete, and is applied to a reinforced concrete foundation including transverse reinforcing bars extending in the longitudinal direction of the foundation. The cover thickness management jig is used when constructing the foundation so that the cover thickness of the concrete from the transverse reinforcing bar to the side surface of the foundation becomes a predetermined dimension. The cover thickness management jig includes a rectangular flat jig plate having a pair of long sides and a pair of short sides. Only one notch portion opened at one of the long sides is formed in the jig plate. The distance between one of the short sides and the notch portion in the long side direction in which the long side extends is set to the predetermined dimension. The jig plate is disposed between a pair of formworks installed on both sides sandwiching the transverse reinforcing bar during the construction. The notch portion is for allowing the transverse reinforcing bar to enter with one of the short sides of the jig plate abutting against the inner surface of the predetermined formwork forming the side surface among the pair of formworks. The width of the notch portion is larger than the diameter of the transverse reinforcing bar so that the transverse reinforcing bar does not fit into the notch portion.

[0010] The jig of the first invention is used when constructing the foundation so that the cover thickness of the concrete from the transverse reinforcing bar embedded in the foundation to the side surface of the foundation becomes a predetermined dimension. The jig includes a rectangular flat jig plate. A notch portion opened at one of the long sides is formed in the jig plate. In the jig plate, the distance between one of the short sides and the notch portion in the long side direction in which the long side extends is set to the predetermined dimension of the cover thickness.

[0011] The jig plate is disposed between a pair of formworks installed on both sides sandwiching the horizontal reinforcement during the foundation construction. At this time, with one short side of the jig plate in contact with the inner surface of the predetermined formwork, it is checked whether the horizontal reinforcement can be inserted into the notch. As a result of the check, if the horizontal reinforcement can be inserted into the notch, it can be said that the distance between the horizontal reinforcement and the inner surface of the predetermined formwork is the above-mentioned predetermined dimension. The distance between the horizontal reinforcement and the inner surface of the predetermined formwork corresponds to the cover thickness of the concrete from the horizontal reinforcement to the side surface of the foundation after the concrete placement (after the foundation construction). Therefore, in this case, a foundation with a cover thickness of the above-mentioned predetermined dimension can be constructed. On the other hand, if the horizontal reinforcement cannot be inserted into the notch, it can be said that the distance between the horizontal reinforcement and the inner surface of the predetermined formwork is not the above-mentioned predetermined dimension. Therefore, in this case, the position of the horizontal reinforcement is corrected so that the distance between the horizontal reinforcement and the inner surface of the predetermined formwork becomes the above-mentioned predetermined dimension.

[0012] By using the jig of the present invention in this way, the cover thickness can be controlled to the above-mentioned predetermined dimension.

[0013] In addition, the notch of the jig plate is formed wider than the diameter of the horizontal reinforcement so that it does not fit into the horizontal reinforcement. Therefore, after checking whether the horizontal reinforcement can be inserted into the notch, the jig can be removed from between the pair of formworks. Therefore, the jig can be reused. Also, the jig can be reused when performing the above check at a plurality of locations in the longitudinal direction of the horizontal reinforcement. Therefore, it is not necessary to prepare the jig separately for each of the above-mentioned plurality of locations. As a result, by reusing the jig, it is possible to manage the cover thickness at low cost.

[0014] The jig for managing the overlapping thickness of the second invention, in the first invention, on the basis, there are a first basis in which the overlapping thickness is defined as a first dimension as the predetermined dimension, and a second basis in which the overlapping thickness is defined as a second dimension different from the first dimension as the predetermined dimension. On the jig plate, in addition to the first notch as the notch, only one second notch opened at the other long side different from the one long side is formed. The distance between the one short side and the first notch in the long side direction is set to the first dimension, and the distance between the other short side and the second notch in the long side direction is set to the second dimension. The second notch is for allowing the horizontal reinforcing bar to enter in a state where the other short side of the jig plate is in contact with the inner surface of the predetermined formwork. The width of the second notch is larger than the diameter of the horizontal reinforcing bar so that the horizontal reinforcing bar does not fit into the second notch.

[0015] There may be a case where a first basis with an overlapping thickness defined as a first dimension and a second basis with an overlapping thickness defined as a second dimension are prepared on the basis. In the second invention, in order to be able to manage the overlapping thicknesses of these first basis and second basis respectively, in addition to the notch (first notch) of the first invention on the jig plate, a second notch is provided. Then, the first notch is used to manage the overlapping thickness of the first basis, and the second notch is used to manage the overlapping thickness of the second basis.

[0016] The second notch is open at the other long side of the jig plate. Also, in the jig plate, the distance between the other short side in the long side direction and the second notch is set to a second dimension which is the dimension of the cover thickness of the second foundation. When constructing the second foundation, it is necessary to check whether it is possible to insert the horizontal reinforcement into the second notch with the other short side of the jig plate in contact with the inner surface of the predetermined formwork. As a result of the check, if it is possible to insert the horizontal reinforcement into the second notch, it can be said that the distance between the horizontal reinforcement and the inner surface of the predetermined formwork is the second dimension. Therefore, in this case, it is possible to construct the second foundation with the cover thickness being the second dimension.

[0017] Thus, according to the jig of the present invention, the cover thickness of the first foundation can be controlled to the first dimension, and the cover thickness of the second foundation can be controlled to the second dimension.

[0018] Also, similar to the first notch, the second notch is formed wider than the diameter of the horizontal reinforcement so that it does not fit into the horizontal reinforcement. Therefore, after checking whether it is possible to insert the horizontal reinforcement into the second notch, the jig can be removed from between the pair of formworks. Therefore, also in this case, it is possible to reuse the jig.

[0019] The method for controlling the cover thickness of the third invention is a control method for controlling the cover thickness using the jig for controlling the cover thickness of the first invention, and after arranging the reinforcement bars, a formwork installation step of sequentially installing the pair of formworks side by side is performed. As a step performed during the formwork installation step, a confirmation step of checking whether it is possible to insert the horizontal reinforcement into the notch with the one short side of the jig plate in contact with the inner surface of the already installed predetermined formwork, and a correction step of correcting the position of the horizontal reinforcement when the horizontal reinforcement cannot be inserted into the notch in the confirmation step.

[0020] According to the third invention, during the formwork installation process of sequentially installing formworks, a confirmation process is performed using the jig of the first invention. In the confirmation process, with one short side portion of the jig plate in contact with the inner surface of a predetermined formwork, it is confirmed whether it is possible to insert a horizontal reinforcing bar into the notch portion. And when it is not possible to insert a horizontal reinforcing bar into the notch portion, a correction process of correcting the position of the horizontal reinforcing bar is performed. In this way, by performing the confirmation process and the correction process during the formwork installation process, the installation of the formwork can be advanced while correcting the position of the reinforcement. Thereby, it is possible to improve the working efficiency regarding the construction work of the foundation.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0022] Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. First, the structure of the foundation will be described based on FIG. 1. FIG. 1 is a cross-sectional view showing the structure of the foundation.

[0023] As shown in FIG. 1, the foundation 11 is a reinforced concrete slab foundation formed by embedding reinforcing bars in concrete 12. The foundation 11 is provided along the outer peripheral portion of a building such as a house. The foundation 11 has a footing portion 14 embedded in the ground and a rising portion 15 that rises upward from the footing portion 14 and is exposed on the ground.

[0024] Inside the foundation 11, a plurality of reinforcing bars are embedded. Each reinforcing bar is composed of deformed reinforcing bars. In the footing portion 14, as the reinforcing bars, a pair of base force bars 16 extending in the longitudinal direction of the foundation 11 and base bars 17 extending in the width direction of the footing portion 14 and connected to each base force bar 16 are provided. A plurality of base bars 17 are arranged at predetermined intervals in the longitudinal direction of the foundation 11.

[0025] In the rising portion 15, as the reinforcing bars, a plurality of horizontal reinforcing bars 21 to 23 extending in the longitudinal direction of the foundation 11 and rib bars 24 as vertical reinforcing bars extending in the vertical direction and connected to each of the horizontal reinforcing bars 21 to 23 are provided. A plurality of rib bars 24 are arranged at predetermined intervals in the longitudinal direction of the foundation 11. Further, the plurality of horizontal reinforcing bars 21 to 23 include an upper end bar 21, a lower end bar 22, and a web bar 23. The upper end bar 21, the lower end bar 22, and the web bar 23 are respectively disposed at the upper end position, the lower end position, and the intermediate position of the rib bar 24, and are fixed to the rib bar 24 by welding or the like at those respective positions. Note that the reinforcement structure of the foundation 11 is a single reinforcement.

[0026] The rising portion 15 has a pair of opposing side surfaces 15a and 15b. These side surfaces 15a and 15b are the side surfaces of the foundation 11. In the rising portion 15, the cover thickness t of the concrete 12 from the upper end bar 21 to the side surface 15a (hereinafter, also simply referred to as the cover thickness t) is set to a predetermined dimension determined in advance. The cover thickness t corresponds to the separation distance (shortest distance) between the upper end bar 21 and the side surface 15a. Note that the side surface 15a corresponds to the "side surface" described in the claims.

[0027] The base 11 includes two types of bases 11A and 11B with different cover depths t. These bases 11A and 11B are shown in Figs. 2(a) and (b). The base 11 includes a base 11A (see Fig. 2(a)) in which the cover depth t is set to a first dimension T1 as a predetermined dimension, and a base 11B (see Fig. 2(b)) in which the cover depth t is set to a second dimension T2 as a predetermined dimension. The second dimension T2 is larger than the first dimension T1. Note that the base 11A corresponds to the "first base", and the base 11B corresponds to the "second base".

[0028] Here, in the present embodiment, when constructing the base 11, the cover depth t is managed using a cover depth management jig 30 (hereinafter abbreviated as the jig 30) so that the cover depth t of the concrete 12 becomes the above-mentioned predetermined dimension. That is, when constructing the base 11A, the cover depth t is managed using the jig 30 so that the cover depth t becomes the first dimension T1, and when constructing the base 11B, the cover depth t is managed using the jig 30 so that the cover depth t becomes the second dimension T2. Therefore, hereinafter, the configuration of such a jig 30 will be described with reference to Fig. 3. Fig. 3 is a front view showing the jig 30.

[0029] As shown in Fig. 3, the jig 30 includes a jig plate 31 having a rectangular flat plate shape (in other words, a rectangular flat plate shape). The jig plate 31 is made of resin or metal and has a pair of short side portions 33a and 33b and a pair of long side portions 34a and 34b. The length of the jig plate 31 in the long side direction in which the long side portions 34a and 34b extend is smaller than the thickness of the rising portion 15 of the base 11 (in other words, the interval between a pair of formworks 42 described later).

[0030] The jig plate 31 is provided with two notch portions 35 and 36. Among the notch portions 35 and 36, the notch portion 35 is formed so as to be open at the long side portion 34a, and the notch portion 36 is formed so as to be open at the long side portion 34b. Specifically, only one notch portion 35 that is open at the long side portion 34a is provided, and only one notch portion 36 that is open at the long side portion 34b is provided. Note that the notch portion 35 corresponds to the "first notch portion", and the notch portion 36 corresponds to the "second notch portion". Also, the long side portion 34a corresponds to the "one long side portion", and the long side portion 34b corresponds to the "other long side portion".

[0031] As will be described later, the notch portion 35 is a portion where the upper end bars 21 are inserted when constructing the foundation 11A. The width of the notch portion 35 is larger than the diameter D (see FIG. 1) of the upper end bars 21 of the foundation 11. Thereby, even if the upper end bars 21 are inserted into the notch portion 35, the upper end bars 21 do not fit into the notch portion 35. Also, the distance between the notch portion 35 and the short side portion 33a is set to a first dimension T1 which is the dimension of the cover thickness t of the foundation 11A. Note that the short side portion 33a corresponds to the "one short side portion". Also, the upper end bars 21 correspond to the "horizontal bars" described in the claims.

[0032] Of the surfaces 35a and 35b on both sides in the width direction of the notch portion 35, the surface 35a on the short side portion 33a side is formed in a straight line extending parallel to the short side portion 33a. On the other hand, the surface 35b on the side opposite to the short side portion 33a is an inclined surface that inclines so as to be separated from the short side portion 33a as it approaches the long side portion 34a. Thereby, the width of the notch portion 35 becomes smaller toward the back side of the notch portion 35, and is minimum at the back portion of the notch portion 35. And the minimum width W of the notch portion 35 is larger than the diameter D of the upper end bars 21.

[0033] The notch portion 36 is a portion into which the upper end bars 21 are inserted when constructing the foundation 11B, as will be described later. The width of the notch portion 36 is larger than the diameter D (see FIG. 1) of the upper end bars 21 of the foundation 11. Thereby, even if the upper end bars 21 are inserted into the notch portion 36, the upper end bars 21 do not fit into the notch portion 36. Further, the distance between the notch portion 36 and the short side portion 33b is set to a second dimension T2 which is the dimension of the cover thickness t of the foundation 11B. Note that the short side portion 33b corresponds to "the other short side portion".

[0034] Of the respective surfaces 36a and 36b on both sides in the width direction of the notch portion 36, the surface 36a on the short side portion 33b side is formed in a linear shape extending parallel to the short side portion 33b. On the other hand, the surface 36b on the side opposite to the short side portion 33b is an inclined surface that inclines so as to be separated from the short side portion 33b as it approaches the long side portion 34b. Thereby, the width of the notch portion 36 becomes smaller toward the back side of the notch portion 36, and is minimized at the back portion of the notch portion 36. And the minimum width W of the notch portion 36 is larger than the diameter D of the upper end bars 21. Note that the notch portion 36 is formed to have the same size and the same shape as the notch portion 35.

[0035] The jig plate 31 is provided with a scale portion 38 marked with graduations along the long side portion 34a and a scale portion 39 marked with graduations along the long side portion 34b. These scale portions 38 and 39 are used, for example, to grasp how much the upper end bars 21 are displaced when the upper end bars 21 cannot be inserted into the notch portions 35 and 36. Note that these scale portions 38 and 39 do not necessarily have to be provided on the jig plate 31. FIGS. 4(b) and 5 described later show the jig plate 31 without the scale portions 38 and 39.

[0036] Next, the method of using the jig 30 described above will be explained. First, the method of using the jig 30 when constructing the foundation 11A will be explained with reference to FIG. 4. FIG. 4 is a cross-sectional view showing the state where the formworks 41 and 42 are installed, and (b) is a cross-sectional view showing the state where the upper end bars 21 are inserted into the notch 35 of the jig plate 31. In FIG. 4(a), for reference, the concrete 12 to be placed inside the formworks 41 and 42 is shown by a two-dot chain line.

[0037] When constructing the foundation 11(11A), first, as shown in FIG. 4(a), a steel bar arranging process of arranging the steel bars 16, 17, 21 to 24 is performed.

[0038] Next, a formwork installation process of installing the formworks 41 and 42 used when placing the concrete 12 is performed. The formworks 41 and 42 include a formwork 41 for forming the footing portion 14 of the foundation 11 and a formwork 42 for forming the rising portion 15. These formworks 41 and 42 are made of wooden or metal plates.

[0039] In the formwork installation process, the formwork 41 is installed on both sides sandwiching the base force bars 16 and the base bars 17. In this case, a pair of opposing formworks 41 are sequentially installed side by side. Also, in the formwork installation process, the formwork 42 is installed on both sides sandwiching the upper end bars 21 and the collar bars 24. In this case, a pair of opposing formworks 42 are sequentially installed side by side.

[0040] Among the pair of formworks 42, the formwork 42a forms the side surface 15a of the foundation 11, and the formwork 42b forms the side surface 15b of the foundation 11. These pair of formworks 42 correspond to the "pair of formworks" described in the claims. Also, the formwork 42a corresponds to the "predetermined formwork".

[0041] Next, the confirmation process carried out during the formwork installation process will be described. In the confirmation process, as shown in Fig. 4(b), the jig plate 31 (jig 30) is placed between a pair of already installed formworks 42 with its short side portion 33a in contact with the inner surface of the formwork 42a. Then, in such a contact state, it is confirmed whether the upper end bar 21 can be inserted into the notch portion 35 of the jig plate 31 from below. Here, as described above, the distance between the notch portion 35 and the short side portion 33a in the jig plate 31 is set to the first dimension T1. Therefore, as a result of the above confirmation, when the upper end bar 21 can be inserted into the notch portion 35 (see Fig. 4(b)), it can be said that the distance between the upper end bar 21 and the inner surface of the formwork 42a is the first dimension T1. Therefore, in this case, by placing the concrete 12, it becomes possible to construct the foundation 11A with the cover thickness t being the first dimension T1.

[0042] On the other hand, when the upper end bar 21 cannot be inserted into the notch portion 35, it can be said that the distance between the upper end bar 21 and the inner surface of the formwork 42a is not the first dimension T1. Therefore, in this case, a correction process is performed to correct the position of the upper end bar 21 so that the distance between the upper end bar 21 and the inner surface of the formwork 42a becomes the first dimension T1. After performing the correction process, again, the confirmation process is performed using the jig plate 31.

[0043] In this way, the correction process and the confirmation process are repeated until the upper end bar 21 can be inserted into the notch portion 35. When the upper end bar 21 can be inserted into the notch portion 35, a new pair of formworks 42 are installed, and the confirmation process, and further, if necessary, the correction process (hereinafter referred to as the confirmation process, etc.) are performed between the pair of formworks 42. In this way, each time a pair of formworks 42 are installed, the confirmation process, etc. are sequentially performed. Therefore, the confirmation process, etc. are performed at a plurality of locations in the longitudinal direction of the upper end bar 21. Note that the confirmation process, etc. do not necessarily have to be performed every time a pair of formworks 42 are installed as long as they are performed at a plurality of locations in the longitudinal direction of the upper end bar 21. The above is the description of the confirmation process and the correction process.

[0044] After performing the formwork installation process, a placing process is carried out to place the concrete 12 inside the formworks 41 and 42. As a result, as the concrete 12 hardens, a foundation 11A with a cover thickness t being the first dimension T1 is constructed. Note that during the placing process, the jig plate 31 is removed from the inside of the formwork 42.

[0045] Subsequently, the usage method of the jig 30 when constructing the foundation 11B will be described with reference to FIG. 5. FIG. 5 is a cross-sectional view showing a state where the upper end bar 21 is inserted into the notch 36 of the jig plate 31. Note that since the bar arrangement process, the formwork installation process, and the placing process are the same as those in the case of constructing the foundation 11A, only the confirmation process and the correction process will be described here.

[0046] As shown in FIG. 5, in the confirmation process, the jig plate 31 is arranged between the pair of already installed formworks 42 with its short side portion 33a in contact with the inner surface of the formwork 42a. And in such a contact state, it is confirmed whether the upper end bar 21 can be inserted into the notch 36 of the jig plate 31 from below. Here, as described above, the distance between the notch 36 and the short side portion 33b in the jig plate 31 is set to the second dimension T2. Therefore, as a result of the above confirmation, when the upper end bar 21 can be inserted into the notch 36 (see FIG. 5), it can be said that the distance between the upper end bar 21 and the inner surface of the formwork 42a is the second dimension T2. Thus, in this case, by placing the concrete 12, it becomes possible to construct a foundation 11B with a cover thickness t being the second dimension T2.

[0047] On the other hand, when the upper end bar 21 cannot be inserted into the notch 36, it can be said that the distance between the upper end bar 21 and the inner surface of the formwork 42a is not the second dimension T2. Therefore, in this case, a correction process is carried out to correct the position of the upper end bar 21 so that the distance between the upper end bar 21 and the inner surface of the formwork 42a becomes the second dimension T2. After performing the correction process, again, the confirmation process is carried out using the jig plate 31. In this way, the correction process and the confirmation process are repeated until the upper end bar 21 can be inserted into the notch 36.

[0048] According to the configuration of the present embodiment described in detail above, the following excellent effects can be obtained.

[0049] As described above, by using the jig 30 of the above embodiment, the covering thickness t of the foundation 11A can be controlled to the first dimension T1, and the covering thickness t of the foundation 11B can be controlled to the second dimension T2.

[0050] Further, each notch portion 35, 36 of the jig plate 31 is formed wider than the diameter D of the upper end rib 21 so as not to fit into the upper end rib 21. Therefore, after confirming whether or not the upper end rib 21 can be inserted into the notch portions 35, 36, the jig 30 can be removed from between the pair of formworks 42. Therefore, the jig 30 can be reused. Also, the jig 30 can be reused when performing the above confirmation at a plurality of locations in the longitudinal direction of the upper end rib 21. Therefore, it is not necessary to prepare a jig separately for each of the above plurality of locations. As a result, by reusing the jig 30, it is possible to manage the covering thickness t at low cost.

[0051] During the formwork installation process of sequentially installing the formworks 42, a confirmation process using the jig 30 is performed. In the confirmation process, with the short side portion 33a (33b) of the jig plate 31 in contact with the inner surface of the formwork 42a, it is confirmed whether or not the upper end rib 21 can be inserted into the notch portion 35 (36). And when the upper end rib 21 cannot be inserted into the notch portion 35 (36), a correction process for correcting the position of the upper end rib 21 is performed. In this way, by performing the confirmation process and the correction process during the formwork installation process, the installation of the formwork 42 can be advanced while correcting the position of the steel reinforcement. As a result, the work efficiency of the construction work of the foundation 11 can be improved.

[0052] The present invention is not limited to the above embodiment, and may be implemented, for example, as follows.

[0053] · In the above-described embodiment, by providing the two cutout portions 35 and 36 in the jig plate 31, the covering thickness t (first dimension T1) of the foundation 11A and the covering thickness t (second dimension T2) of the foundation 11B can be managed respectively. However, this can be changed, and by providing only one of the cutout portions 35 and 36 in the jig plate 31, only the covering thickness t of either one of the foundations 11A and 11B can be managed.

Explanation of Signs

[0054] 11... foundation, 12... concrete, 15a... side surface, 21... upper end bar as horizontal reinforcement, 42... formwork, 42a... formwork as a predetermined formwork, 30... jig for managing covering thickness, 31... jig plate, 33a, 33b... short side portions, 34a, 34b... long side portions, 35... cutout portion as the first cutout portion, 36... cutout portion as the second cutout portion.

Claims

1. It is formed by embedding reinforcing bars inside concrete, and is applied to a reinforced concrete foundation including transverse reinforcing bars extending in the longitudinal direction of the foundation. It is a cover thickness management jig used when constructing the foundation so that the cover thickness of the concrete from the transverse reinforcing bars to the side surface of the foundation becomes a predetermined dimension. It includes a rectangular flat jig plate having a pair of long sides and a pair of short sides. Only one notch is formed in the jig plate on one of the long sides, which is open. The distance between one of the short sides and the notch in the long side direction in which the long side extends is set to the predetermined dimension. The jig plate is arranged between a pair of formworks installed on both sides sandwiching the transverse reinforcing bars during the construction. The notch is for allowing the transverse reinforcing bars to enter with one of the short sides of the jig plate in contact with the inner surface of the predetermined formwork that forms the side surface among the pair of formworks. A cover thickness management jig in which the width of the notch is larger than the diameter of the transverse reinforcing bars so that the transverse reinforcing bars do not fit into the notch.

2. In the foundation, there is a first foundation in which the cover thickness is defined as a first dimension as the predetermined dimension, and a second foundation in which the cover thickness is defined as a second dimension as the predetermined dimension different from the first dimension. In addition to the first notch as the notch in the jig plate, only one second notch is formed in the other long side different from the one long side, which is open. The distance between one of the short sides and the first notch in the long side direction is set to the first dimension. The distance between the other short side and the second notch in the long side direction is set to the second dimension. The second notch is for allowing the transverse reinforcing bars to enter with the other short side of the jig plate in contact with the inner surface of the predetermined formwork. The cover thickness management jig according to Claim 1, wherein the width of the second notch is larger than the diameter of the transverse reinforcing bars so that the transverse reinforcing bars do not fit into the second notch.

3. A management method for managing the cover thickness using the cover thickness management jig according to Claim 1, After arranging the reinforcing bars, a formwork installation step is performed in which the pair of formworks are sequentially installed side by side. As a process performed during the formwork installation process, a confirmation process of checking whether it is possible to insert the horizontal reinforcing bar into the notch portion in a state where one short side portion of the jig plate is brought into contact with the inner surface of the predetermined formwork already installed; a correction process of correcting the position of the horizontal reinforcing bar when the horizontal reinforcing bar cannot be inserted into the notch portion in the confirmation process; A method for managing the cover thickness, comprising the above.

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