A sign, and a method for constructing reinforced concrete using the sign.

Abstract

This invention provides a display sheet that allows for easy identification of the location where sleeves are to be installed when constructing reinforced concrete in which sleeves are to be installed. [Solution] In constructing reinforced concrete in which sleeves are provided, the indicator body 10 is positioned below the location where the sleeves are provided when arranging the reinforcing bars, and comprises sleeve indicator sections 11, 12, and 13 that indicate the location where the sleeves are provided by the central axis and contour of the sleeves, and cover thickness indicator sections 15 and 16 that indicate the required cover thickness for the reinforcing bars adjacent to the sleeves. The indicator body 10 is a flexible, elongated strip, and the sleeve indicator sections 11, 12, and 13 are provided continuously in the longitudinal direction, with the edges 15 and 16 in the width direction of the indicator body 10 functioning as cover thickness indicator sections 15 and 16.

Description

Technical Field

[0001] The present invention relates to a display body used when constructing reinforced concrete provided with a sleeve, and a method for constructing reinforced concrete using the display body.

Background Art

[0002] Conventionally, when constructing a concrete structure and providing a sleeve or the like in the concrete structure, a marking operation for describing the position of the sleeve or the like on the substrate based on the drawing is performed, and then the sleeve or the like is arranged. Since this marking operation needs to be performed accurately based on the drawing, there has been a problem that a great deal of time is required for the operation.

[0003] As a solution to the above-described problem of the conventional marking operation, there is a work sheet described in Patent Document 1. The work sheet described in Patent Document 1 has the size of the entire floor plan, and the holes for insert parts to be embedded in concrete, the holes for sleeves, and the holes for electrical boxes are described in actual size. This work sheet is spread on the substrate of the formwork and used. By tracing along the shape of each hole with a marking material, the position of each hole can be transferred to the substrate. Then, after installing each member based on the transferred information, concrete is placed. By using the work sheet described in Patent Document 1, the time for the marking operation can be shortened, work mistakes can be reduced, and the sheet can be reused for each floor having the same floor plan.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When using the work sheet described in Patent Document 1, it is easy to transfer the information to the formwork, but there is a possibility that it may be erased by friction from the movement of people and objects, or by wind and rain, and if there is a delay between the transfer and the installation of the components, the transfer will need to be done again. In addition, because the position of each hole is indicated at actual size, the overall shape of the sheet is large, and if there are obstacles such as materials, it may not be possible to spread the work sheet out sufficiently. Furthermore, if the work sheet shifts during the transfer process, it may lead to errors in the transfer work.

[0006] The present invention was made to solve the above problems, and its main objective is to provide a display body that allows for easy recognition of the location where a sleeve is to be installed when constructing reinforced concrete in which a sleeve is to be installed, and a method for constructing reinforced concrete using the display body. [Means for solving the problem]

[0007] The first configuration is a display body that is placed below the position where the sleeve is provided when arranging reinforcing bars in the construction of reinforced concrete in which a sleeve is provided, and comprises a sleeve display section that indicates the position where the sleeve is provided, and a cover thickness indicator section that indicates the required cover thickness for the reinforcing bar adjacent to the sleeve.

[0008] In the first configuration, by placing the indicator below the location where the sleeve is installed, the required concrete cover thickness for the sleeve can be determined by the concrete cover thickness indicator. Therefore, by placing the reinforcing bars while referring to the concrete cover thickness indicator and then pouring the concrete, the required concrete cover thickness can be secured. In particular, if the person who places the sleeve and the person who places the reinforcing bars are different, the person who places the sleeve can place the indicator according to the first configuration, which will encourage the person who places the reinforcing bars to place the reinforcing bars in a way that avoids the sleeve while ensuring the required concrete cover thickness. Furthermore, by placing the reinforcing bars while avoiding the sleeve, it will also encourage the placement of additional reinforcing bars that may be needed.

[0009] The second configuration, in addition to the first configuration, is a flexible, elongated strip, and the sleeve indicator and cover thickness indicator are provided continuously or in multiple locations in the longitudinal direction, and can be cut to a predetermined length.

[0010] In the second configuration, the length of the display unit can be adjusted according to the thickness of the reinforced concrete being constructed.

[0011] The third configuration, in addition to the second configuration, includes a length indicator section that shows the length in the longitudinal direction.

[0012] In the third configuration, the length can be cut to the required length by referring to the length indicator.

[0013] The fourth configuration is one of the first to third configurations, in which the edges in the width direction function as the cover thickness indicator.

[0014] In the fourth configuration, the required concrete cover thickness can be secured by arranging the reinforcing bars so that they do not interfere with the outer shape of the display body, thus allowing for more precise placement of the reinforcing bars. Furthermore, since the width of the display body is such that the required concrete cover thickness can be secured, the width of the display body can be reduced compared to the case where the configuration that functions as a concrete cover thickness indicator is printed on one of the front or back surfaces of the display body.

[0015] The fifth configuration, in addition to the fourth configuration, is provided with a writing field where the height at which the sleeve is installed can be written, and is marked to indicate that the writing field is the installation height.

[0016] In the fifth configuration, the height at which the sleeve will be installed can be determined by looking at the display unit placed on the ground, so the three-dimensional position where the sleeve will be placed can be recognized using only this display unit.

[0017] The sixth configuration, in addition to the fourth configuration, includes a sleeve indicator that shows the position of the central axis of the sleeve.

[0018] In the sixth configuration, since the sleeve display portion indicates the central axis extending in the thickness direction of the reinforced concrete, it is possible to suppress the inclination of the position of the sleeve with respect to the reinforced concrete when arranging the sleeve.

[0019] In the seventh configuration, in addition to the fourth configuration, the sleeve display portion indicates the contour of the sleeve.

[0020] In the seventh configuration, the same effect as the sixth configuration can be obtained.

[0021] In the eighth configuration, in addition to the fourth configuration, a substrate in which the belt-like body is woven in a plain weave lattice pattern and a sheet made of a transparent synthetic resin are laminated, and the sleeve display portion is printed on the side facing the base material of the sheet.

[0022] In the eighth configuration, since the sleeve display portion is not printed on the surface of the sheet, it will not disappear during use. Also, when cutting the display body, it can be cut along the belt-like body, and the length can be adjusted more easily.

[0023] The ninth configuration is a construction method of reinforced concrete in which a sleeve is provided, and includes a display body having a sleeve display portion indicating the position where the sleeve is provided and a cover thickness indicating portion indicating the required cover thickness of the reinforcing bars adjacent to the sleeve with respect to the sleeve, and arranging the display body below the position where the sleeve is provided to display the position where the sleeve is provided; a step of arranging the reinforcing bars and the sleeve constituting the reinforced concrete; and a step of placing concrete so as to cover the display body and embedding the display body in the concrete.

[0024] [[ID=2�]]In the ninth configuration, by using the display body according to the first configuration, it is possible to appropriately ensure the cover thickness of the concrete with respect to the reinforcing bars at the position where the sleeve is provided when constructing the reinforced concrete in which the sleeve is provided.

Brief Description of the Drawings

[0025] [Figure 1] It is a plan view of the display body. [Figure 2] It is a schematic perspective view showing the structure of the display body. [Figure 3] It is a schematic side view showing the structure of the display body. [Figure 4] It is a perspective view showing the usage state of the display body. [Figure 5] It is a plan view showing the usage state of the display body.

Embodiments for Carrying Out the Invention

[0026] The display body 10 according to the present embodiment is used when constructing reinforced concrete provided with sleeves. In Japan, when constructing reinforced concrete, in order to ensure the durability etc. of the reinforced concrete, it is stipulated by law to secure the "cover thickness", which is the shortest distance between the reinforcing bars and the concrete. The display body 10 according to the present embodiment is used for the purpose of securing the necessary cover thickness when constructing reinforced concrete provided with sleeves. In the following description, the shortest distance between the reinforcing bars and the concrete is expressed as the "cover thickness", but it may also be expressed as the "cover thickness" or the "cover thickness", and the expression "cover thickness" in the following description can be appropriately read or replaced with the expression "cover thickness" or "cover thickness".

[0027] The indicator body 10 according to this embodiment is exemplified as one used when installing a sleeve with an inner diameter of 100 mm. The indicator body 10 according to this embodiment is flexible and has a uniform width and thickness in the shape of a strip. The indicator body 10 has a central axis line 11, which is a dashed line extending in the longitudinal direction to indicate the center in the width direction; a first contour line 12, which is a solid line extending in the longitudinal direction parallel to the central axis line 11 and spaced apart from the central axis line 11 on one side in the width direction; and a second contour line 13, which is a solid line extending in the longitudinal direction parallel to the central axis line 11 and spaced apart from the central axis line 11 on the other side in the width direction. The spacing between the central axis line 11 and the first contour line 12, and the spacing between the central axis line 11 and the second contour line 13 are equal, and since it is used for installing a sleeve with an inner diameter of 100 mm, the spacing is slightly larger than 50 mm. Furthermore, a pipe diameter indicator section 14 is printed so as to overlap with the central axis 11, indicating that a sleeve with an inner diameter of 100 mm will be installed. Multiple of these pipe diameter indicator sections 14 are provided at equal intervals in the longitudinal direction. Note that the central axis 11 indicates the central axis of the sleeve, and the first contour line 12 and second contour line 13 indicate the contour of the sleeve; therefore, the central axis 11, the first contour line 12, and the second contour line 13 can be collectively referred to as the sleeve indicator section.

[0028] The central axis 11 is a line indicating the center in the width direction of the display body, and since the distance between the first contour line 12 and the central axis 11 and the distance between the second contour line 13 and the central axis 11 are equal, the distance between the first contour line 12 and the first edge 15, which is the edge on one side, and the distance between the second contour line 13 and the second edge 16, which is the edge on the other side, are also equal, and in this embodiment, the distance is 50 mm. Between the first contour line 12 and the first edge 15, multiple first cover thickness markings 17 are provided at intervals in the longitudinal direction to indicate that the distance between the first contour line 12 and the first edge 15 is 50 mm.

[0029] A first auxiliary line 18 is provided between the first contour line 12 and the first edge 15, extending parallel to the first contour line 12, and a second auxiliary line 19 is provided between the second contour line 13 and the second edge 16, extending parallel to the second contour line 13. The distance between the first auxiliary line 18 and the first contour line 12, and the distance between the second auxiliary line 19 and the second contour line 13 are equal, and in this embodiment, they are 40 mm. In addition, multiple second cover thickness markings 20 indicating that the distance between the first contour line 12 and the first auxiliary line 18 is 40 mm are provided at intervals in the longitudinal direction. Multiple writing fields 21 where the height at which the sleeve is installed can be entered are provided at intervals in the longitudinal direction between the first auxiliary line 18 and the first contour line 12. In this writing field 21, there is a blank space after the notation "h=", and the notation "h=" allows us to recognize that the number written in writing field 21 is the height at which the sleeve will be installed.

[0030] Between the second contour line 13 and the second edge 16, a scale 22 is provided that extends from the second edge 16 toward the second contour line 13. This scale 22 is provided at 10 mm intervals in the longitudinal direction. Of these, the scale 22 provided at 100 mm intervals extends from the second edge 16 toward the second contour line 13, the scale 22 provided midway between the scales provided at 100 mm intervals and indicating the 50 mm position in the longitudinal direction extends from the second edge 16 toward the second contour line 13, and the remaining scales 22 provided at 10 mm intervals extend from the second edge 16 toward the midpoint between the second edge 16 and the second auxiliary line 19. Since this scale 22 displays the length of the display body 10, it can also be called the length display section. Furthermore, between the second contour line 13 and the second auxiliary line 19, multiple rebar warning markings 23 are provided at intervals along the longitudinal direction, requiring that space be secured above the position where the display body 10 is installed.

[0031] As shown in Figures 2 and 3, the display body 10 described above is constructed by laminating a transparent polypropylene sheet 30 and a base material 40. The base material 40 is made of polyethylene and consists of strip-shaped bodies 41 and 42 of approximately uniform thickness and width that are plain woven and interwoven in a grid pattern. Specifically, the base material 40 is plain woven with strip-shaped bodies 41 extending in the longitudinal direction of the display body 10 and strip-shaped bodies 42 extending in a direction perpendicular to the longitudinal direction of the display body.

[0032] On the reverse side of the sheet 30, which faces the base material 40, the following are printed: a central axis line 11, a first contour line 12, a second contour line 13, a pipe diameter indicator 14, a first cover thickness indicator 17, a first auxiliary line 18, a second auxiliary line 19, a second cover thickness indicator 20, a writing area 21, a scale 22, and a warning indicator 23, thereby forming a printed layer 31. When printing these, if the base material 40 is blue or black, only the individual characters, symbols, and lines need to be printed in white or another color.

[0033] The sheet 30 and the substrate 40, configured as described above, are heat-welded together with the back surface of the sheet 30 facing the substrate 40. At this time, the heat welding is performed at a temperature higher than the lower melting point of the sheet 30 and the substrate 40. In this way, as shown in Figure 3, the areas of the printed layer 31 where characters, lines, etc. are printed are in contact with the substrate 40, and a heat-welded layer 32 is formed between the sheet 30 and the substrate 40 in the areas where the printed layer 31 is not provided. Alternatively, a sheet with a lower melting point may be sandwiched between the sheet 30 and the substrate 40, and that sheet may be used for heat welding. In this case, a heat-welded layer 32 is also formed between the printed layer 31 and the substrate 40.

[0034] The method of using the indicator body 10 configured as described above will be explained with reference to Figures 4 and 5. In Figures 4 and 5, some of the reference numerals attached to the indicator body 10 have been omitted. As described above, the indicator body 10 is used when constructing reinforced concrete in which a sleeve is installed. When constructing reinforced concrete, first, lean concrete is poured at the construction site, and then the indicator body 10 according to this embodiment is placed. In this embodiment, an example of an indicator body 10 used for placing a sleeve with an inner diameter of 100 mm is shown, but indicator bodies 10 indicating other inner diameters corresponding to the inner diameter of the installed sleeve are also prepared, and the indicator body 10 corresponding to the inner diameter of the installed sleeve is selected. Since the indicator body 10 is a flexible strip, it is wound into a roll before use, and is cut to the required length by referring to the scale 22. At this time, the length of the indicator body 10 after cutting may be equal to the thickness of the reinforced concrete, or it may be longer or shorter than that thickness. In addition, the height at which the sleeve is installed is written in the writing field 21. This height is usually the height of the center of the sleeve, but it may also be the height of the top or bottom edge of the sleeve. Note that this writing field 21 may be written before the installation of the display unit 10, or after the installation as described later.

[0035] The display body 10 is positioned vertically below the location where the sleeve is to be installed, such that the central axis 11 of the display body 10 coincides with the central axis of the sleeve. At this time, the display body 10 is fixed to the lean concrete by driving rivets using a rivet gun to prevent it from shifting from its installed position. With this arrangement, the area vertically above the region whose outer diameter is defined by the first contour line 12 and the second contour line 13 becomes the area where the sleeve is to be installed. Next, the reinforcing bars 50 around the sleeve are positioned so as not to interfere with the display body 10 in plan view, and the sleeve is positioned so as to coincide with the central axis 11 and the first and second contour lines 12 and 13 of the display body 10 in plan view. At this time, the reinforcing bars 50 extending in the width direction of the reinforced concrete are provided above and below the sleeve and are perpendicular to the display body 10. On the other hand, the reinforcing bars 50, which also extend in the thickness direction of the reinforced concrete, extend parallel to the display body 10 outside the first edge 15 and the second edge 16. In this way, the reinforcing bars 50 are positioned outside the first edge 15 and the second edge 16 vertically above the display body 10, and gaps are provided between the reinforcing bars 50 and the sleeve, defined by the first contour line 12 and the first edge 15, and by the second contour line 13 and the second edge 16. Furthermore, the height at which the sleeve is installed can be determined by referring to the height written in the writing field 21, and if the length of the display body 10 is equal to the thickness of the concrete, the thickness of the concrete can also be determined by visually checking the length of the display body 10.

[0036] After the reinforcing bars 50 and sleeves are positioned in this manner, concrete is poured to form reinforced concrete. At this time, concrete is poured up to the perimeter of the sleeves. That is, concrete is poured into the gaps between the reinforcing bars 50 and the sleeves, which are defined by the first contour line 12 and the first edge 15, and the gaps defined by the second contour line 13 and the second edge 16. In this way, when constructing reinforced concrete through which the sleeves penetrate, the concrete cover thickness for the reinforcing bars 50 positioned around the sleeves can be ensured as the cover thickness defined by the first contour line 12 and the first edge 15, and the cover thickness defined by the second contour line 13 and the second edge 16, i.e., the cover thickness indicated in the first cover thickness notation 17. Furthermore, since the first edge 15 and the second edge 16 can ensure sufficient concrete cover at the location where the sleeve is installed, the first edge 15 and the second edge 16 can be referred to as concrete cover indicators, and it can be said that the first edge 15 and the second edge 16 function as concrete cover indicators. After the indicator body 10 has fulfilled its function, it may be removed and reused or disposed of. However, if removal is difficult, such as when it is fixed with rivets, or if there is no need to reuse it, concrete may be poured to cover the entire indicator body 10, and the indicator body 10 may be embedded in the poured concrete. The process of removing or embedding the indicator body 10 can be carried out at any time after the sleeve and the reinforcing bars around the sleeve have been placed.

[0037] With the above configuration, the display unit 10 according to this embodiment provides the following effects.

[0038] - By placing the indicator 10 below the location where the sleeve is installed, the required cover thickness for the sleeve can be determined by the first edge 15 and second edge 16, which function as cover thickness indicators. Therefore, the required cover thickness can be secured by placing the reinforcing bars while referring to the first edge 15 and second edge 16 and then pouring the concrete. In particular, if the person who places the sleeve and the person who places the reinforcing bars are different, the person who places the sleeve can place the indicator 10 to encourage the person who places the reinforcing bars to place the reinforcing bars in a way that avoids the sleeve while ensuring the required cover thickness, and can also encourage the placement of additional reinforcing bars that may be needed by avoiding the sleeve.

[0039] The length of the display body 10 can be adjusted according to the thickness of the reinforced concrete being constructed. Specifically, the shape of the display body 10 is a long strip, and the central axis 11, first contour line 12, second contour line 13, first auxiliary line 18, second auxiliary line 19, and scale 22 are provided continuously in the longitudinal direction, and the pipe diameter display section 14, first cover thickness indication 17, second cover thickness indication 20, writing area 21, and warning indication 21 are provided repeatedly in the longitudinal direction, so the function of each indication can be ensured even when the length of the display body is adjusted. Furthermore, since the first edge 15 and the second edge 16 function as cover thickness indicators, the cover thickness indicators can also be said to be provided continuously in the longitudinal direction, so the function of the cover thickness indicators can also be ensured when the length of the display body 10 is adjusted.

[0040] Since the first edge 15 and the second edge 16 function as cover thickness indicators, the required cover thickness can be secured by arranging the reinforcing bars so as not to interfere with the outer shape of the display body 10, allowing for more precise placement of the reinforcing bars. Furthermore, since the width of the display body 10 is sufficient to secure the required cover thickness, the width of the display body 10 can be reduced compared to the case where the configuration that functions as a cover thickness indicator is printed on one of the front or back surfaces of the display body 10.

[0041] Since there is a writing field 21 where the height at which the sleeve will be installed can be written, the height at which the sleeve will be installed can be determined by looking at the display unit 10 placed on the ground, and the three-dimensional position at which the sleeve will be installed can be recognized using only this display unit 10.

[0042] Since the central axis 11, first contour line 12, and second contour line 13 extending in the longitudinal direction function as sleeve indicators, these lines also extend in the thickness direction of the reinforced concrete in which the sleeve is provided, thereby preventing the sleeve from tilting relative to the reinforced concrete.

[0043] The display unit 10 is composed of a sheet 30 and a base material 40, and the printed surface is on the side of the sheet 30 that faces the base material 40, so the printed surface can be used without fading.

[0044] Since the base material 40 is formed by plain weaving a strip-shaped body 41 extending in the longitudinal direction of the display body 10 and a strip-shaped body 42 extending in a direction perpendicular to the longitudinal direction of the display body, when cutting the display body 10, it is possible to cut along the strip-shaped body 42 extending in a direction perpendicular to the longitudinal direction of the display body, making it easier to adjust the length.

[0045] The display body 10 is intended to be fixed by driving rivets using a rivet gun, and at least one of the sheet 30 and the base material 40 is required to have sufficient strength to prevent tearing when rivets are driven into it. In this embodiment, since the base material 40 is made by weaving together a plurality of strip-shaped bodies 41 and 42, even if the strip-shaped bodies 41 and 42 into which the rivets are driven tear to some extent, the tear will not spread to the other strip-shaped bodies 41 and 42, thus maintaining the overall strength of the display body 10 when rivets are driven into it.

[0046] <Variation> In this embodiment, a central axis 11, a first contour line 12, and a second contour line 13 are provided as sleeve indicators to show the position of the sleeve, but only the central axis 11 may be provided. Even if only the central axis 11 is provided as a sleeve indicator, if an indicator body 10 corresponding to the inner diameter of the sleeve is used, the reinforcing bar can be positioned in a location where the required cover thickness can be obtained using the first edge 15 and the second edge 16, even if the first contour line 12 and the second contour line 13 are not provided. Furthermore, even if only the first contour line 12 and the second contour line 13 are provided without a central axis 11 as a sleeve indicator, the reinforcing bar can be positioned in a location where the required cover thickness can be obtained using the first edge 15 and the second edge 16 by aligning the widthwise position of the sleeve with the first contour line 12 and the second contour line 13. Furthermore, even when the central axis 11 is not provided, and only one of the first contour line 12 and the second contour line 13 is provided to function as a sleeve indicator, the required cover thickness can be secured by aligning one of the contours in the width direction of the sleeve.

[0047] In this embodiment, the first edge 15 and the second edge 16 function as cover thickness indicators, but markings that function as cover thickness indicators may be printed on the back or front surface of the sheet. In this case, the reinforcing bars can be positioned by referring to the printed cover thickness indicators.

[0048] In this embodiment, a transparent sheet made of synthetic resin and a substrate are bonded together by heat welding, but adhesives may be used for bonding, or various other known joining methods besides bonding or welding may be employed.

[0049] In this embodiment, various markings are printed on the back surface of a transparent sheet 30 made of synthetic resin, but they may also be printed on the front surface of the sheet 30. In this case, the sheet 30 does not have to be transparent, and various other materials such as paper can be used.

[0050] In this embodiment, the display body 10 is composed of a sheet 30 and a base material 40. However, the display body 10 may be composed only of a sheet 30 on which various displays are printed, without using a base material 40. Alternatively, the sheet 30 may be omitted, and the various displays may be printed on the base material 40. Furthermore, the sheet 30 may not be printed with various displays, but rather molded to have irregularities on its surface, and these irregularities may provide the functionality of the various displays.

[0051] In this embodiment, the base material 40 is made by plain weaving a strip-shaped body 41 extending in the longitudinal direction of the display body 10 and a strip-shaped body 42 extending in a direction perpendicular to the longitudinal direction of the display body to form a grid. However, the strip-shaped bodies extending diagonally to the longitudinal direction may be plain woven together, or other weaving methods may be employed. Furthermore, the base material 40 may be a flexible strip-shaped body formed by integral molding.

[0052] In this embodiment, the display body 10 is made of a flexible material and is windable, but it may also be made of a non-flexible or low-flexible material and be in the shape of a plate.

[0053] In this embodiment, a rivet gun is used to fix the display body 10 to the lean concrete, but other known fixing methods can be used. Furthermore, if lean concrete cannot be provided, the display body 10 can be installed on the ground, and even when the display body 10 is installed on the ground, the same effects as those achieved by the display body 10 according to this embodiment can be obtained. [Explanation of symbols]

[0054] Display element...10, Center axis...11, First contour line...12, Second contour line...13, Pipe diameter display section...14, First edge...15, Second edge...16, First cover thickness indication...17, First auxiliary line...18, Second auxiliary line...19, Second cover thickness indication...20, Writing area...21, Scale...22, Warning indication...23, Sheet...30, Printed layer...31, Substrate...40, Strip-shaped body...41, 42

Claims

1. In the construction of reinforced concrete in which a sleeve is provided, a display body is provided below the position where the sleeve is provided when arranging the reinforcing bars, A sleeve indicator section that shows the position where the sleeve is provided, A display body comprising: a cover thickness indicator portion that indicates the required cover thickness for the reinforcing bar adjacent to the sleeve; and the sleeve.

2. The display body according to claim 1, which is a long, flexible strip, wherein the sleeve display portion and the cover thickness indicator portion are provided continuously or in multiple locations in the longitudinal direction, and can be cut to a predetermined length.

3. The display body according to claim 2, wherein a length indicator section is provided to indicate the length in the longitudinal direction.

4. The display body according to any one of claims 1 to 3, wherein the edge in the width direction functions as the cover thickness indicator.

5. The display body according to claim 4, wherein a writing field is provided on which the height at which the sleeve is installed can be written, and the writing field is marked to indicate that it is the installation height.

6. The display unit according to claim 4, wherein the sleeve display portion indicates the position of the central axis of the sleeve.

7. The display body according to claim 4, wherein the sleeve display portion indicates the outline of the sleeve.

8. A substrate in which strip-shaped materials are woven in a plain weave grid pattern, It is constructed by laminating a transparent synthetic resin sheet, The display body according to claim 4, wherein the sleeve display portion is printed on the side of the sheet facing the base material.

9. A method for constructing reinforced concrete in which a sleeve is provided, A step of displaying the location where the sleeve is provided by placing a display body below the location where the sleeve is provided, the display body having a sleeve display section indicating the location where the sleeve is provided and a cover thickness indicator section indicating the required cover thickness for the reinforcing bar adjacent to the sleeve. The steps include arranging the reinforcing bars and sleeves that constitute the reinforced concrete, A construction method comprising the steps of pouring concrete to cover the aforementioned display body and embedding the display body in the concrete.

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