Reinforcing bar spacer

Abstract

To provide a spacer for reinforcement allowing changing of covering depth of reinforcement with a single spacer, without preparing multiple spacers for reinforcement for every protrusion amount of each positioning protrusion.MEANS FOR SOLVING THE PROBLEM: As a spacer for reinforcement for holding a space between a fitted horizontal reinforcement and a form, a reinforcement engaging part 11 engaging a horizontal reinforcement Y in an inserted state inside from an insertion hole 12 opened in the circumferential direction, and a first and a second positioning protrusions 2, 3 fan-likely protruded outward in the radial direction from a position with a space in the circumferential direction at an outer periphery of the reinforcement engaging part 11, and making every protrusion end abut on the surface of a form K are provided. The first and the second positioning protrusions 2, 3 have different protrusion lengths from the reinforcement engaging part 11 of every positioning protrusions 2, 3 to the protrusion ends.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a reinforcing bar spacer that is attached to a reinforcing bar to maintain the distance between the reinforcing bar and a formwork and ensure a constant covering thickness for the reinforcing bar when pouring concrete. [Background technology]

[0002] Generally, in reinforced concrete construction in civil engineering and architecture, rebar spacers are attached to the rebars to maintain the distance between the rebars and the formwork, ensuring the thickness of concrete covering the rebars. Although rebar spacers made of cement-based or metal-based materials are recommended due to their compatibility with concrete, plastic spacers are also widely used because they are lightweight, easy to mass-produce, and easy to handle.

[0003] One such plastic reinforcing bar spacer known in the art comprises a roughly U-shaped reinforcing bar fitting portion that is rotatably attached to one reinforcing bar, and a number of positioning protrusions that protrude radially from the outer periphery of the reinforcing bar fitting portion and abut their tips against the surface of the formwork, with each positioning protrusion being formed so that the cover thickness of the reinforcing bar is equal when two adjacent positioning protrusions are abutted against the formwork (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-71015 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional reinforcing bar spacer, the cover thickness of the reinforcing bar is made equal by abutting two adjacent positioning protrusions among the multiple positioning protrusions against the formwork, but the cover thickness of the reinforcing bar itself is fixed. Therefore, if you want to change the cover thickness of the reinforcing bar, you need to change to a new reinforcing bar spacer with a larger or smaller protrusion amount for each positioning protrusion amount, and you need to prepare a reinforcing bar spacer for each protrusion amount of the positioning protrusion.

[0006] The present invention has been made in consideration of these points, and its object is to provide a reinforcing bar spacer that allows the cover thickness of each reinforcing bar to be changed with a single spacer, without the need to prepare multiple reinforcing bar spacers for each protrusion amount of each positioning protrusion. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention is premised on a reinforcing bar spacer that is attached to one reinforcing bar when pouring concrete and maintains a gap between the reinforcing bar and a formwork. The spacer further includes a reinforcing bar fitting portion that fits the reinforcing bar while being inserted into the reinforcing bar through an insertion hole that opens in the circumferential direction, and a plurality of positioning protrusions that protrude radially outward in a fan shape from positions spaced apart in the circumferential direction on the outer periphery of the reinforcing bar fitting portion, and each protrusion end is selectively brought into contact with the surface of the formwork. The plurality of positioning protrusions have different protrusion lengths from the reinforcing bar fitting portion to their protrusion ends. Further, a contraction means is provided in the reinforcing bar fitting portion for contracting the insertion hole in a circumferential direction so as to press the reinforcing bar fitting portion against the reinforcing bar so as not to move, and gripping portions are provided on the two positioning protrusions located at both ends of the circumferential direction of the insertion hole, and assist the contraction operation of the contraction means in the circumferential direction of the insertion hole while gripping both positioning protrusions. It is characterized by the fact that

[0010] Each of the positioning projections may be provided with an opening hole that opens to allow the concrete to flow when poured.

[0011] Furthermore, at least one of the positioning protrusions may be provided with an indicator that indicates the difference in protruding length from the reinforcing bar fitting portion to the protruding end for each positioning protrusion. Effect of the Invention

[0012] In summary, by varying the projection lengths of the positioning protrusions that protrude radially outward in a fan-like shape from positions spaced apart in the circumferential direction on the outer periphery of the rebar fitting part that fits the rebar inside to the projection ends, the cover thickness of the rebar can be changed by selectively abutting the projection ends of the positioning protrusions against the surface of the formwork. This eliminates the need to prepare different rebar spacers for each projection amount of the positioning protrusions, and allows the cover thickness of the rebar to be changed with a single rebar spacer.

[0013] In addition, by providing the reinforcing bar fitting portion with a shrinking means for shrinking the insertion hole in the circumferential direction, the reinforcing bar fitting portion can be firmly fixed to the reinforcing bar, and movement of the reinforcing bar fitting portion relative to the reinforcing bar during concrete pouring can be effectively prevented even if the flow of concrete, particularly the flow of aggregate in the concrete, abuts each positioning protrusion.

[0014] In addition, by providing gripping portions protruding from each of the two positioning protrusions located at both circumferential ends of the insertion hole, which assist the contraction means in contracting the insertion hole in the circumferential direction while gripping both positioning protrusions, when the gripping portions of both positioning protrusions are gripped while the reinforcing bar is fitted inside the reinforcing bar fitting portion, the contraction action in the circumferential direction of the insertion hole becomes very easy to perform, and the contraction action by the contraction means can be smoothly supported.

[0015] In addition, by providing each positioning protrusion with an opening that allows the concrete to flow when it is poured, the concrete and the aggregate in the concrete can flow through the opening to reliably fill and adhere the concrete around each positioning protrusion, preventing the formation of gaps on the front and back of the reinforcing bar spacer, ensuring that the concrete is integrated without being divided, and reducing stress concentrations that occur during thermal expansion and drying shrinkage of the concrete, thereby reducing the occurrence of cracks.

[0016] Furthermore, by providing at least one of the positioning protrusions with a display unit that displays the difference in protrusion length from the rebar fitting portion to the protruding end for each positioning protrusion, the difference in the protrusion amount for each positioning protrusion can be easily distinguished according to the display on the display unit, and the cover thickness of the rebar can be reliably changed using a single rebar spacer. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a state in which a reinforcing bar spacer according to an embodiment of the present invention is attached to a horizontal bar and a protruding piece of one of the positioning projections is abutted against a formwork. FIG. [Diagram 2] 2 is a side view of the reinforcing bar spacer attached to the horizontal bar in FIG. 1, viewed from the other positioning protrusion side. FIG. [Diagram 3] FIG. 2 is a plan view of the reinforcing bar spacer attached to the cross bar of FIG. 1, seen from above. [Figure 4] FIG. 2 is a rear view of the reinforcing bar spacer attached to the horizontal bars of FIG. 1, as viewed from the rear side, which is in the axial direction of the horizontal bars. [Diagram 5] FIG. 2 is a front view of the reinforcing bar spacer of FIG. 1 as viewed from the front side. [Figure 6] FIG. 6 is a rear view of the reinforcing bar spacer of FIG. 5, seen from the rear side. [Figure 7] FIG. 6 is a right side view of the reinforcing bar spacer of FIG. 5, seen from the right side. [Figure 8] FIG. 6 is a left side view of the reinforcing bar spacer of FIG. 5, seen from the left side. [Figure 9] FIG. 6 is a plan view of the reinforcing bar spacer of FIG. 5 viewed from above. [Figure 10] FIG. 6 is a bottom view of the reinforcing bar spacer of FIG. 5 viewed from below. [Figure 11] 6 is a perspective view of the reinforcing bar spacer of FIG. 5, seen obliquely from the right side. [Figure 12] 2 is a perspective view showing a state in which the reinforcing bar spacer of FIG. 1 is attached to a horizontal bar and the protruding piece of the other positioning protrusion is abutted against a formwork. FIG. [Figure 13]13 is a left side view of the reinforcing bar spacer attached to the horizontal bar in FIG. 12, viewed from one of the positioning protrusions. FIG. [Figure 14] FIG. 13 is a plan view of the reinforcing bar spacer attached to the cross bar of FIG. 12, seen from above. [Figure 15] 13 is a front view of the reinforcing bar spacer attached to the cross bar in FIG. 12, seen from the front side. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] Fig. 1 is a perspective view showing a reinforcing bar spacer according to an embodiment of the present invention attached to a horizontal bar with a protruding piece of one first positioning protrusion abutting against a formwork, and Fig. 2 is a side view of the reinforcing bar spacer attached to the horizontal bar in Fig. 1, seen from the other second positioning protrusion side. Also, Fig. 3 is a plan view of the reinforcing bar spacer attached to the horizontal bar in Fig. 1, seen from above, and Fig. 4 is a rear view of the reinforcing bar spacer attached to the horizontal bar in Fig. 1, seen from the rear side in the axial direction of the horizontal bar.

[0020] As shown in Fig. 1 to Fig. 4, reference numeral 1 denotes a reinforcing bar spacer that maintains the gap between horizontal bars Y as reinforcing bars and a formwork K, and is attached to one horizontal bar Y when pouring concrete. This reinforcing bar spacer 1 is made of synthetic resin such as polyethylene or polypropylene.

[0021] The horizontal bars Y are tied to the vertical bars T with a wire or other fastener (not shown) while being positioned at their intersections S with the vertical bars T, T (only two are shown in the figure). At this time, the horizontal bars Y are placed closer to the formwork K than the vertical bars T. Furthermore, deformed bars of D13 (nominal diameter 12.7 mm) or D16 (nominal diameter 15.9 mm) are used as the horizontal bars Y and the vertical bars T.

[0022] Fig. 5 shows a front view of the reinforcing bar spacer 1 in Fig. 1 as seen from the front side, and Fig. 6 shows a rear view of the reinforcing bar spacer 1 in Fig. 5 as seen from the rear side. Also, Fig. 7 shows a right side view of the reinforcing bar spacer 1 in Fig. 5 as seen from the right side, and Fig. 8 shows a left side view of the reinforcing bar spacer 1 in Fig. 5 as seen from the left side. Furthermore, Fig. 9 shows a plan view of the reinforcing bar spacer 1 in Fig. 5 as seen from above, Fig. 10 shows a bottom view of the reinforcing bar spacer 1 in Fig. 5 as seen from below, and Fig. 11 shows a perspective view of the reinforcing bar spacer 1 in Fig. 5 as seen diagonally from the right side.

[0023] As shown in Figs. 5 to 11, the reinforcing bar spacer 1 has a reinforcing bar fitting portion 11 that fits into a horizontal bar Y. This reinforcing bar fitting portion 11 is formed in a substantially C-shaped cross section having an insertion hole 12 through which the horizontal bar Y can be inserted in the circumferential direction. A hinge portion 15 is provided at a substantially central position in the circumferential direction of the reinforcing bar fitting portion 11, and the circumferential spacing of the insertion hole 12 can be increased or decreased with this hinge portion 15 as a fulcrum. A plurality of protruding ribs 13, 13, ... extending parallel to an axis passing through the center O of the reinforcing bar fitting portion 11 are provided in the circumferential direction on the inner circumference of the reinforcing bar fitting portion 11, and have an anti-slip effect on the horizontal bar Y.

[0024] The reinforcing bar spacer 1 also includes first and second positioning protrusions 2, 3 that protrude radially outward in a fan-like shape from positions spaced apart in the circumferential direction on the outer periphery of the reinforcing bar fitting portion 11. The first and second positioning protrusions 2, 3 are provided at positions facing each other on the outer periphery of the reinforcing bar fitting portion 11, and each protrudes in a fan-like shape within a range of approximately 90° in the circumferential direction from the center O of the reinforcing bar fitting portion 11.

[0025] The first and second positioning protrusions 2, 3 can selectively abut their protruding ends against the surface of the formwork K in accordance with the required cover thickness of the horizontal bars Y by changing the circumferential position of the reinforcing bar fitting portion 11 relative to the horizontal bars Y. In this case, the first and second positioning protrusions 2, 3 are positioned at both circumferential ends of the insertion hole 12, with one end of each protrusion located between them.

[0026] The first and second positioning projections 2, 3 each have a flat fan piece 21, 31 that protrudes radially outward from the axial center of the reinforcing bar fitting portion 11 in a fan shape, a protruding edge portion 22, 32 that is approximately a quarter-circular arc shape that is integrally provided at the radially outer end of the fan piece 21, 31, and three ribs 23, 33 that extend radially from the center O of the reinforcing bar fitting portion 11 within a range of approximately 45° on both the front and back sides of the fan piece 21, 31. The fan pieces 21, 31 of the first and second positioning projections 2, 3 each have an opening hole 24, 34 that opens between the ribs 23, 33. These opening holes 24, 34 are open to allow the concrete to flow when pouring.

[0027] Furthermore, eight protrusions 25, 25, ... are provided at equal intervals in the circumferential direction on the protruding edge 22 of the first positioning protrusion 2. The tip of each protrusion 25 is formed in a substantially arc shape. Moreover, each protrusion 25 is arranged sparsely in the circumferential direction, and the interval between adjacent protrusions 25, 25 is slightly wider than the circumferential width of each protrusion 25.

[0028] On the other hand, seven protrusions 35, 35, ... are provided at equal intervals in the circumferential direction on the protruding edge 32 of the second positioning protrusion 3. The tip of each protrusion 35 is formed in a larger arc shape than each protrusion 25 of the first positioning protrusion 2. Also, each protrusion 35 is arranged more closely in the circumferential direction than each protrusion 25 of the first positioning protrusion 2, and the interval between adjacent protrusions 35, 35 is slightly narrower than the circumferential width of each protrusion 25.

[0029] The first and second positioning protrusions 2, 3 have different protruding lengths (radial lengths) from the reinforcing bar fitting portion 11 to the tips of the protruding pieces 25, 35 that are the protruding ends. Specifically, the protruding length from the center O of the reinforcing bar fitting portion 11 to the tips of the protruding pieces 25 of the first positioning protrusion 2 is set to 40 mm, and the protruding length from the center O of the reinforcing bar fitting portion 11 to the tips of the protruding pieces 35 of the second positioning protrusion 3 is set to 50 mm.

[0030] Also, indication portions 26, 36 indicating the protruding length of the first and second positioning protrusions 2, 3 (protruding length from the center O of the rebar fitting portion 11 to the tip of each protruding piece 25, 35 of the first and second positioning protrusions 2, 3) are provided on both the front and back surfaces of the fan pieces 21, 31 of each positioning protrusion 2, 3. Furthermore, the protruding edge portion 22 and each protruding piece 25 of the first positioning protrusion 2 are colored red (shown as a shaded area in the figure) to clearly distinguish them from the second positioning protrusion 3.

[0031] The first positioning protrusion 2 is inserted from above through the insertion hole 12 of the reinforcing bar fitting portion 11 against the horizontal bar Y, so that the tip of each protruding piece 25, which serves as the protruding end, abuts against the surface of the formwork K to obtain the required cover thickness (40 mm) of the horizontal bar Y.

[0032] Fig. 12 is a perspective view showing the state in which the reinforcing bar spacer 1 in Fig. 1 is attached to a horizontal bar Y with the protrusion 35 of the other second positioning protrusion 3 abutting against the formwork K, and Fig. 13 shows a left side view of the reinforcing bar spacer 1 attached to the horizontal bar Y in Fig. 12, seen from one of the first positioning protrusions 2. Fig. 14 is a plan view of the reinforcing bar spacer 1 attached to the horizontal bar Y in Fig. 12, seen from above, and Fig. 15 is a front view of the reinforcing bar spacer 1 attached to the horizontal bar Y in Fig. 12, seen from the front side.

[0033] As shown in Figures 12 to 15, the second positioning protrusion 3 is inserted through the insertion hole 12 of the rebar fitting portion 11 relative to the cross bar Y to change the circumferential position of the rebar fitting portion 11 by 180°, so that the tip of each protruding piece 35, which serves as the protruding end, abuts against the surface of the formwork K to obtain the required cover thickness (50 mm) of the cross bar Y.

[0034] Further, the reinforcing bar fitting portion 11 is provided with a contraction means 4 for contracting the insertion hole 12 in the circumferential direction so as to press the reinforcing bar fitting portion 11 against the horizontal bar Y so as not to move. The contraction means 4 is provided between the first and second positioning protrusions 2, 3 located at both circumferential ends of the insertion hole 12. Furthermore, the contraction means 4 includes a first protruding piece 41 that protrudes toward the first positioning protrusion 2 from the radial center of the rib 33 on the insertion hole 12 side of the second positioning protrusion 3, and a second protruding piece 42 that protrudes toward the second positioning protrusion 3 from the radial center of the rib 23 on the insertion hole 12 side of the first positioning protrusion 2.

[0035] The first and second protruding pieces 41, 42 are formed in an arc shape with the center O of the reinforcing bar fitting portion 11 as a concentric circle. The first protruding piece 41 can be inserted into an arc-shaped groove 43 having a generally concave cross section provided in the second protruding piece 42. A plurality of rack teeth 44, 44, ... are provided on the side surface of the insertion hole 12 of the first protruding piece 41. Meanwhile, claws 45, 45, ... that mesh with the rack teeth 44 and allow movement in the insertion direction (approaching direction) while prohibiting movement in the separating direction are provided on the side surface of the insertion hole 12 of the arc-shaped groove 43 of the second protruding piece 42. At this time, due to the engagement between each rack tooth 44 of the first protruding piece 41 and each claw 45 of the second protruding piece 42, the insertion hole 12, which opens in a circumferential range of approximately 90° from the center O of the rebar fitting portion 11, is narrowed, while the distance between the first and second positioning protrusions 2, 3, which each protrude in a fan-like shape within a circumferential range of approximately 90° from the center O of the rebar fitting portion 11, is widened.

[0036] Furthermore, the first and second positioning protrusions 2, 3 located at both circumferential ends of the insertion hole 12 are provided with gripping portions 27, 37 protruding downward, respectively, which enable the positioning protrusions 2, 3 to be gripped with the left and right hands. The gripping portions 27, 37 assist the circumferential contraction of the insertion hole 12 by the contraction means 4 when gripped with the left and right hands, respectively. Furthermore, the lower end of each gripping portion 27, 37 is provided with a hole that allows the concrete to flow when poured, which is extremely effective in reducing the weight of the product in addition to preventing cross-sectional loss inside the concrete.

[0037] Therefore, in this embodiment, the protruding lengths from the center O of the reinforcing bar fitting portion 11 to the protruding pieces 25, 35 of the first and second positioning protrusions 2, 3, which protrude radially outward in a fan-like shape from positions spaced apart in the circumferential direction on the outer periphery of the reinforcing bar fitting portion 11 into which the reinforcing bar Y is fitted, are different to 40 mm and 50 mm, respectively. Therefore, by selectively abutting the protruding pieces 25, 35 of the two positioning protrusions 2, 3 against the surface of the formwork K, the cover thickness of the reinforcing bar Y can be changed to 40 mm and 50 mm. This makes it unnecessary to prepare different reinforcing bar spacers for each protruding amount of the positioning protrusions 2, 3, and even with a single reinforcing bar spacer 1, the cover thickness of the reinforcing bar Y can be changed.

[0038] In addition, a contraction means 4 is provided between the first and second positioning protrusions 2, 3 located at both circumferential ends of the insertion hole 12 of the reinforcing bar fitting portion 11, and the first protrusion 41 of the contraction means 4 is inserted into the arc-shaped groove 43 of the second protrusion 42 to engage the rack teeth 44 and the claws 45 on the side surfaces of the insertion hole 12, thereby contracting the reinforcing bar fitting portion 11 in the circumferential direction so as to be pressed against the horizontal bar Y and unable to move. This allows the reinforcing bar fitting portion 11 to be firmly fixed to the horizontal bar Y, and effectively prevents the reinforcing bar fitting portion 11 from moving relative to the horizontal bar Y when the concrete is poured, even if the flow of concrete, particularly the flow of aggregate in the concrete, abuts against the positioning protrusions 2, 3.

[0039] In addition, the first and second positioning protrusions 2, 3 located at both circumferential ends of the insertion hole 12 are each provided with a gripping portion 27, 37 which assists the shrinking operation of the insertion hole 12 in the circumferential direction by the shrinking means 4 while gripping both the positioning protrusions 2, 3. Therefore, when the gripping portions 27, 37 of both the positioning protrusions 2, 3 are gripped while the cross bar Y is fitted inside the rebar fitting portion 11, the circumferential shrinking operation of the insertion hole 12 becomes very easy to perform, and the shrinking operation by the shrinking means 4 can be smoothly supported.

[0040] In addition, each positioning protrusion 2, 3 is provided with an opening 24, 34 which allows the concrete to flow when it is poured, so that the concrete and the aggregate in the concrete flow through the opening 24, 34 to reliably fill and adhere the concrete around each positioning protrusion 2, 3, preventing the formation of gaps on the front and back of the reinforcing bar spacer 1, and the concrete is integrated without being divided, thereby reducing stress concentration that occurs during thermal expansion and drying shrinkage of the concrete and reducing the occurrence of cracks.

[0041] Furthermore, indication portions 26, 36 are provided on both the front and back sides of the fan pieces 21, 31 of each positioning protrusion 2, 3 to indicate the protruding length from the center O of the reinforcing bar fitting portion 11 for each positioning protrusion 2, 3 to each protrusion piece 25, 35, and the protruding edge 22 and each protrusion piece 25 of the first positioning protrusion 2 are colored red to clearly distinguish them from the second positioning protrusion 3.Therefore, the difference in the protruding amount of each positioning protrusion 2, 3 can be easily distinguished by following the indication portions 26, 36 and the red colored portions, and the cover thickness of the cross bar Y can be reliably changed using a single reinforcing bar spacer 1.

[0042] The present invention is not limited to the above-described embodiment, and includes various other modified examples. For example, in the above-described embodiment, the reinforcing bar fitting portion 11 of the reinforcing bar spacer 1 is fitted to the horizontal bar Y, but the reinforcing bar fitting portion of the reinforcing bar spacer may be fitted to the vertical bar.

[0043] In addition, in the above embodiment, the protruding length from the center O of the reinforcing bar fitting portion 11 of the first and second positioning protrusions 2, 3 to each protrusion piece 25, 35 is changed to 40 mm and 50 mm, respectively, but the protruding length from the center of the reinforcing bar fitting portion of the first and second positioning protrusions to each protrusion piece is not limited to this and may be changed to two relatively similar protruding lengths.

[0044] Furthermore, only the protruding edge 22 and each protrusion 25 of the first positioning protrusion 2 are colored red (shown in a shaded state in the figure), but it goes without saying that the second positioning protrusion may also be colored another color.

[0045] Furthermore, in the above embodiment, two first and second positioning protrusions 2, 3 having different protruding lengths from the center O of the reinforcing bar fitting portion 11 to each protrusion piece 25, 35 are provided, but three or more types of multiple positioning protrusions having different protruding lengths may be provided in the circumferential direction of the outer surface of the reinforcing bar fitting portion. [Explanation of symbols]

[0046] 1 Reinforcing bar spacer 11 Reinforcement bar fitting 12 Insertion hole 2 First positioning protrusion 25 protrusion 26 Display section 3 Second positioning protrusion 35 Projection piece 36 Display section 4. Shrinking Method K-frame Y horizontal bar (reinforced bar)

Claims

1. A reinforcing bar spacer that is attached to one reinforcing bar when pouring concrete and maintains the distance between the reinforcing bar and a formwork, A reinforcing bar fitting portion that fits the reinforcing bar while being inserted into the interior through an insertion hole that opens in the circumferential direction; A plurality of positioning protrusions protruding in a fan shape from positions spaced apart in the circumferential direction on the outer periphery of the reinforcing bar fitting portion in the radially outward direction, each protruding end being selectively abutted against the surface of the formwork; The plurality of positioning protrusions each have a different protruding length from the reinforcing bar fitting portion to a protruding end, The reinforcing bar fitting portion is provided with a contraction means for contracting the insertion hole in a circumferential direction so as to press the reinforcing bar fitting portion against the reinforcing bar so as not to move, A spacer for reinforcing bars, characterized in that the two positioning protrusions located at both circumferential ends of the insertion hole each have a gripping portion protruding therefrom which assists the contraction means in contracting the insertion hole in the circumferential direction while gripping the two positioning protrusions.

2. A spacer for reinforcing bars as described in claim 1, wherein each positioning protrusion portion is provided with an opening hole which opens to allow concrete to flow when the concrete is poured.

3. A spacer for reinforcing bars as described in claim 1 or claim 2, wherein at least one of the positioning protrusions is provided with an indicator that displays the difference in protruding length from the reinforcing bar fitting portion to the protruding end for each positioning protrusion.

Images