JP7182508B2 - Spacer and level indicator for reinforced concrete - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act January 15, 2019 at 4-30 Wakabadai, Inagi City, Tokyo, January 23, 2019 at 22 Shinko-cho, Hitachinaka City, Ibaraki Prefecture, January 2019 On February 26th, 6-39 Nanjo, Sawara-ku, Fukuoka City, Fukuoka Prefecture, and on February 7th, 2019 at 1232-1 Shibanomachi, Mitsuke City, Niigata Prefecture, MAKES Co., Ltd. released it.

TECHNICAL FIELD The present invention relates to a reinforced concrete spacer, and more particularly, a reinforced concrete spacer and concrete used for holding reinforcing bars placed inside concrete at a predetermined height when constructing a concrete floor or concrete slab. The present invention relates to a level indicator body used as an indicator of the thickness of a cover.

BACKGROUND ART In many cases, when constructing an earthen floor of a building, a concrete slab, or the like, reinforcing bars are placed prior to pouring the concrete. This reinforcing bar is held at a predetermined height by, for example, a spacer made of mortar (see Patent Documents 1 to 4, etc.) placed in advance at a predetermined position on the bottom surface of the foundation, and is necessary by pouring concrete and hardening it. strength. Spacers of various sizes are already on the market so that each house builder can correspond to various height positions of reinforcing bars calculated by structural calculations. Such spacers are highly useful as building materials.

On the other hand, spacers made of mortar are heavy, and depending on the size, one package weighs 20 kg or more, or 30 kg or more. was becoming In recent years, in order to reduce such work burden, the applicant of the present application has developed a resin spacer that can be easily reduced in weight, and filed a patent application (Patent Document 2). In addition, some resin spacers have a hollow part (communication hole) or add projecting parts (level indicators, level pillars) to serve as a scale for the cover thickness of reinforcing bars and concrete surfaces. A usable one is also provided (see Patent Document 3, etc.). The purpose of use of any spacer is merely an indicator of the height position and cover thickness of the reinforcing bar, so the strength required is not very high.

JP-A-2000-145020 Japanese Patent Application Laid-Open No. 2007-332629 Japanese Utility Model Laid-Open No. 6-32595 Japanese Patent No. 5105606

However, in actual use, not only is the weight of the reinforcing bars placed directly on the spacers, but the worker may move over the spacers and reinforcing bars, causing a load equivalent to the weight of the worker to move. Since there is a possibility that the spacer may be affected, the resin spacer having a hollow portion may be less strong than the mortar spacer having no hollow portion.

In addition, concrete contains crushed stone called "aggregate", and since there are standards such as 25 mm and 20 mm for the size of the aggregate, there are cases where the aggregate cannot pass through the hollow part of the spacer. In general, when placing concrete, a machine called a vibrator is used, and a construction method that prevents junk due to vibration is used. It was thought that it could fill the interstices of the aggregate. Actually, however, as shown in FIG. 10, there is a possibility that a phenomenon (clogging) occurs in which the aggregate 50 clogs at the entrance or in the middle of the hollow portion 40 of the conventional spacer 60 . If the aggregate 50 clogs the hollow portion 40 , the aggregate 50 blocks the inflow of the mortar 80 , which may cause a problem that the concrete placement is completed while the gap 70 is included. By the way, in order to avoid the occurrence of the gap 70, it is conceivable to accurately grasp the installation locations of the resin spacers 60 at the construction site and apply a vibrator to all installation locations. It is unrealistic because it is inviting.

Therefore, the present invention provides a spacer for reinforced concrete that is capable of both preventing the occurrence of voids in concrete and maintaining an appropriate strength, and has a wide range of material selection, and a level applied thereto The object is to provide an indicator body.

In order to solve the above-mentioned problems, the invention according to claim 1 is a reinforced concrete spacer for holding a reinforcing bar at a predetermined height position, which has a rectangular tube-shaped main body, the length of the side of which is the length of the reinforcing bar. and a cross-shaped rib provided inside the main body and formed so as to support the vicinity of the center of each side of the main body. A plurality of anti-skid grooves arranged in stripes are provided at least in the vicinity of the center of the upper side surface of the main body on which the reinforcing bar is placed.

In order to solve the above-mentioned problems, the present invention according to claim 2 provides the spacer for reinforced concrete according to claim 1, wherein the corners of the hollow portion partitioned by the ribs are reinforced in a rounded shape or build-up shape. It is characterized by

In order to solve the above-mentioned problems, the present invention according to claim 3 is the spacer for reinforced concrete according to claim 1 or 2, wherein the side serving as the installation surface of the main body is a bottom plate portion, and the depth length of the bottom plate portion is The width is formed longer than the depth length of the other sides.

In order to solve the above problems, the present invention according to claim 4 is a spacer for reinforced concrete according to claim 3, wherein the length of the side in the height direction and the length of the side in the width direction of the main body are different. The grooves are provided on the surfaces of two sides in directions perpendicular to each other, and the two sides facing the two sides provided with the grooves are the bottom plate portions, respectively. and

In order to solve the above problems, the present invention according to claim 5 is a spacer for reinforced concrete according to any one of claims 1 to 4, wherein the main body and the ribs are made of polypropylene (PP), impact-resistant It is characterized by being made of any one of polystyrene (HIPS), polyethylene (PE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), ABS resin, and polycarbonate (PC).

In order to solve the above-mentioned problems, the present invention as set forth in claim 6 is a level indicator that is attached to the spacer for reinforced concrete according to any one of claims 1 to 5 and serves as an indicator of concrete cover thickness. and a mounting portion for mounting on the upper side of the main body, and a level portion extending a predetermined length from the mounting portion.

In order to solve the above-mentioned problems, the present invention according to claim 7 provides the level indicator body according to claim 6, further comprising a level adjustment cap that is detachably attached to the level portion for height adjustment. It is characterized by

In the spacer for reinforced concrete according to the present invention, the ribs are formed in a cross shape to enlarge each of the four hollow spaces partitioned by the ribs to prevent clogging of the aggregate and to prevent voids from occurring in the concrete. can be prevented. Moreover, since the upper surface of the main body is provided with a groove at least near the center thereof to prevent the reinforcing bar from sliding sideways, it becomes easy to position the reinforcing bar near the center of the surface of the main body. As long as the reinforcing bar is positioned near the center of the upper side of the main body in this way, even if the worker gets on the reinforcing bar and puts his/her weight on it, it will be supported by the ribs positioned below the reinforcing bar. Therefore, there is an effect that it is possible to prevent damage (destruction) of the main body due to the dead weight of the reinforcing bar and the weight of the worker. Therefore, although the number of ribs is only two (one in the horizontal direction and one in the vertical direction), the cross-shaped ribs cooperate with the grooves that have the function of positioning the reinforcing bars. , can effectively prevent the main body from being damaged. As a result, the spacer for reinforced concrete according to the present invention can prevent the formation of voids inside the concrete and maintain an appropriate strength. Further, according to the spacer for reinforced concrete according to the present invention, since the strength required for the material itself can be suppressed, there is a wide range of materials to choose from, and not only is it lightweight, but also inexpensive resin can be selected. There is

Moreover, the level indicator body according to the present invention has the effect of being able to indicate the cover thickness of concrete by attaching it to the spacer for reinforced concrete according to the present invention.

FIG. 1 is a perspective view showing a first embodiment of a reinforced concrete spacer according to the present invention. FIG. 2 is a perspective view showing a modification of the first embodiment. FIG. 3 is a perspective view showing a second embodiment of the spacer for reinforced concrete according to the present invention. FIG. 3(A) shows the reinforced concrete spacer in the first posture, and FIG. 3(B) shows the reinforced concrete spacer in the second posture. FIG. 4 is a perspective view showing a modification of the second embodiment. FIG. 4A shows a modified example in the first posture, and FIG. 4B shows a modified example in the second posture. FIG. 5 is a perspective view showing a reinforced concrete spacer to which a level indicator is attached. FIG. 6 is a left side view of the level indicator body, and FIGS. 6A to 6C show the low level, middle level, and high level states of the level indicator body to which the level adjustment cap is attached. 6(D) shows the level indicator body with the level adjusting cap removed. 7(A) is a top view of the level adjustment cap, FIG. 7(B) is a left side view of the level adjustment cap, FIG. 7(C) is a bottom view of the level adjustment cap, and FIG. 7(D) is a level adjustment cap. is a rear view of the. FIG. 8 is a graph comparing properties of various resins that are candidate materials for the spacer for reinforced concrete. FIG. 9 is a schematic cross-sectional view for explaining the reason why voids are less likely to occur in concrete when the spacer for reinforced concrete of the first embodiment or the second embodiment is used. FIG. 10 is a schematic cross-sectional view illustrating voids generated in concrete when a conventional spacer for reinforced concrete is used.

BEST MODE FOR CARRYING OUT THE INVENTION A spacer for reinforced concrete according to the present invention will now be described in detail based on several preferred embodiments with reference to the drawings.

1. 1st Embodiment First, 1st Embodiment of the spacer for reinforced concrete is described. FIG. 1 is a perspective view showing a first embodiment of a spacer for reinforced concrete. This spacer 1 for reinforced concrete is used, for example, when constructing an earthen floor of a building or a concrete slab.

1-1. Basic Configuration of Reinforced Concrete Spacer As illustrated, the reinforced concrete spacer 1 of the present embodiment has a substantially rectangular tubular main body 1A for holding the reinforcing bar 35 at a predetermined height position. At least the side length L1 in the height direction of the shaped body 1A is set to be the same as the height at which the reinforcing bars 35 should be arranged. Inside the main body 1A, cross-shaped ribs 1B, 1B are provided so as to support the vicinity of the center of each side of the main body 1A.

1-2. Grooves A plurality of grooves 1C, 1C, . Here, each of the four hollow portions 1D, 1D, 1D, 1D partitioned by the cross-shaped ribs 1B, 1B is a columnar space, and each of the plurality of grooves 1C, 1C, 1C, ... is a columnar space. It is set parallel to the center line of the hollow portions 1D, 1D, 1D, 1D. Further, the upper side 12 is planar, and the depths of the plurality of grooves 1C, 1C, . . . provided on the upper side 12 are uniform.

In the example of FIG. 1, the groove portion 1C is formed over the entire upper side 12 of the main body 1A. However, as shown in FIG. may be limited to the vicinity. If the main formation range of the groove portion 1C is limited in this way, the worker can use the groove portion 1C as an index (mark) of the arrangement destination of the reinforcing bar 35, and the arrangement destination of the reinforcing bar 35 is off from the vicinity of the center. In this case, it is easy to slide sideways, so it becomes easy to guide the reinforcing bar 35 to the vicinity of the center.

Incidentally, in the example of FIG. 2, one groove 1C is formed at both ends (both shoulders) of the upper side 12, and the grooves 1C, 1C on both shoulders are formed so that the reinforcing bars 35 of the spacer 1 for reinforced concrete are formed. It has a function to prevent it from slipping down from both shoulders.

1-3. Reinforcement structure As shown in Fig. 2, four hollow portions 1D, 1D, 1D, 1D partitioned by ribs 1B, 1B have four corners 11, 11, 11, 11, ... of which are curved or built up. reinforced in shape. According to such a reinforcing structure, it is possible to suppress the possibility of cracking of the joints between the ribs 1B, 1B and the main body 1A, the intersections of the ribs 1B, 1B, and the like.

1-4. Regarding the bottom plate portion As shown in FIG. 1, the side that serves as the surface for installing the main body 1A is the bottom plate portion 1E. It is formed longer than the length L3. By providing such a bottom plate portion 1E, the depth of the hollow portions 1D, 1D, 1D, 1D can be narrowed while improving the posture stability of the spacer for reinforced concrete 1 (see FIG. 9). Compared with the conventional spacer 60 for reinforced concrete (FIG. 10), which secures a large depth, it has a structure in which clogging of the aggregate 50 is less likely to occur. Experiments have shown that the mortar 80 can be easily filled in the gaps between the aggregates 50, and that the placed concrete has almost no gaps 70 (see FIG. 10) (see FIG. 9).

1-5. Regarding Dimensions The dimensions of each part of the spacer for reinforced concrete 1 of the present embodiment are, for example, as follows.

Side length L1 in the height direction: 70 mm
Width direction side length L4: 70mm
Body side thickness T1: 3.5mm
Rib thickness T2: 4mm
Groove depth d: 0.5 mm
Bottom plate depth length L2: 50mm
Depth length L3 of sides other than the bottom plate part: 30 mm

That is, the reinforced concrete spacer 1 of this embodiment is a 70×70 type reinforced concrete spacer in which both the length L1 of the side in the height direction and the length L4 of the side in the width direction of the main body 1A are set to 70 mm. be. By setting the lengths L1 and L4 to 80 mm while keeping the other dimensions the same, the spacer 1 for reinforced concrete of 80×80 type can be realized. Of course, the dimensions are not limited to this.

1-6. Materials Various materials can be selected for the main body 1A and the ribs 1B, 1B of the reinforced concrete spacer 1, and especially when resin is selected, the weight of the reinforced concrete spacer 1 can be easily reduced. be. As the resin, any of polypropylene (PP), high-impact polystyrene (HIPS), polyethylene (PE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), ABS resin, and polycarbonate (PC) can be used. can be done. Among them, it has been found by experiments that high-impact polystyrene (HIPS) is suitable for the spacer 1 for reinforced concrete of this embodiment in terms of balance between strength and cost (see FIG. 8).
The main body 1A and the ribs 1B, 1B are integrally molded from the same material, and known molding techniques such as molding (plastic injection molding) and 3D printers can be applied to the molding. Of course, it is also possible to apply other manufacturing methods such as cutting by machining.

1-7. Effects of the First Embodiment As described above, in the reinforced concrete spacer 1 of the present embodiment, the ribs 1B are cross-shaped. Since each space of 1D, 1D) can be enlarged, it is possible to prevent clogging of the aggregate (crushed stone) 50 and prevent the formation of voids 70 (FIG. 10) in the concrete (FIG. 9). For example, the spacer 1 for reinforced concrete of the present embodiment can ensure the size of each hollow portion 1D as large as 29.5 mm in the case of the 70×70 type, and as large as 34.5 mm in the case of the 80×80 type. Therefore, it was found by experiments that there is almost no possibility that the aggregate (crushed stone) 50 of 25 mm or less is clogged.

Moreover, since the groove portion 1C for preventing the sideways slippage of the reinforcing bar 35 is provided at least near the center of the surface of the upper side 12 of the main body 1A, it is easy to position the reinforcing bar 35 in the vicinity of the center of the upper side 12 of the main body 1A. Become. As long as the reinforcing bar 35 is positioned near the center of the upper side 12 of the main body 1A in this way, even if the worker were to stand on the reinforcing bar 35 and put his weight on it, it would still be positioned below the reinforcing bar 35. Since the vertical ribs 1B always support the main body 1A from below (FIG. 1), it is possible to prevent damage (destruction) of the main body 1A due to the weight of the reinforcing bars 35 and the weight of the operator. Therefore, the cross-shaped ribs 1B, 1B cooperate with the groove 1C, which has the function of positioning the reinforcing bars 35, even though the number of ribs 1B is only two, thereby preventing the main body 1A from being damaged. can be effectively suppressed. As a result, the reinforced concrete spacer 1 according to the present embodiment can prevent the formation of voids in concrete and maintain an appropriate strength.

Further, according to the spacer 1 for reinforced concrete with such a structural ingenuity, the strength required for the material itself can be suppressed, so there is a wide range of materials to choose from. For example, it is also possible to choose a resin with a price comparable to that of mortar (see FIG. 8). For example, recycled resin can be used as an environmental measure. As an example, 70x70 type mortar spacers weigh about 22 kg with 30 spacers per package. can be In this case, effects such as "reduction of greenhouse gases" and "reduction of logistics costs" can be expected from the perspective of logistics alone. Also, at actual construction sites, there are cases where a moisture-proof sheet is laid to block moisture from the ground, and then spacers are placed on top of it. There were times when holes were drilled in the seat, but there is no need to worry about such things with the lightweight spacer made of resin, so the workability is greatly improved.

2. 2nd Embodiment Next, 2nd Embodiment of the spacer for reinforced concrete is described. FIG. 3 is a perspective view showing a second embodiment of the spacer for reinforced concrete according to the present invention. FIG. 3(A) shows the reinforced concrete spacer in the first posture, and FIG. 3(B) shows the reinforced concrete spacer in the second posture. FIG. 4 is a perspective view showing a modification of the second embodiment. FIG. 4A shows a modified example in the first posture, and FIG. 4B shows a modified example in the second posture. Here, differences from the first embodiment will be described, and descriptions of common points will be omitted. In addition, in FIGS. 3 and 4, portions having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals.

2-1. Basic Configuration of Reinforced Concrete Spacer As illustrated, the reinforced concrete spacer 2 of the second embodiment is different from the reinforced concrete spacer 1 of the first embodiment in that the side length L1 in the height direction of the main body 1A and the length L1 in the width direction of the main body 1A are A plurality of groove portions 1C, 1C, 1C, . Two sides located opposite to the two provided sides are the bottom plate portions 1E, 1E, respectively. Thus, the reinforced concrete spacer 2 having the two bottom plate portions 1E, 1E can be used in the first posture (FIG. 3A) with one of the bottom plate portions 1E as the installation surface. It can also be used in the second posture (FIG. 3(B)) with the bottom plate portion 1E as the installation surface. In the reinforced concrete spacer 2 of the second embodiment, since the lengths L1 and L4 of adjacent sides are different, the distance between the first posture (Fig. 3(A)) and the second posture (Fig. 3(B)) , the height and cover thickness of the reinforcing bar 35 can be varied. The side 12, which is the upper side when in the first posture (FIG. 3A), is planar and has a uniform height. Further, the side 13, which is the upper side when in the second posture (FIG. 3B), is planar and has a uniform height.

2-2. Groove In the example of FIGS. 3A and 3B, the groove 1C is formed over the entire adjacent sides 12 and 13, but the main forming range of the groove 1C is shown in FIG. , (B) near the center of each of the surfaces 12,13. If the main formation range of the groove portion 1C is limited in this way, the operator can use the groove portion 1C as an index (mark) of the arrangement destination of the reinforcing bar 35, and the arrangement destination of the reinforcing bar 35 is the side 12 or the side 13. If it is out of the vicinity of the center, it is easy to slide sideways, so it is easy to guide the reinforcing bar 35 to the vicinity of the center.

Incidentally, in the example of FIGS. 4A and 4B, only one groove portion 1C is formed in each of the shoulder portions on the side close to the bottom plate portion 1E and the shoulder portion on the side far from the bottom plate portion 1E of the side 12. , one groove portion 1C is also formed in each of the shoulder portions of the side 13 on the side close to the bottom plate portion 1E and the shoulder portion on the side far from the bottom plate portion 1E. The grooves 1C, 1C formed on both shoulders of the side 12 allow the reinforcing bars 35 to slide downward from the shoulders of the side 12 when the reinforced concrete spacer 2 is in the first posture (FIG. 4A). The grooves 1C, 1C formed on both shoulders of the side 13 prevent the reinforcing bars 35 from moving along the side 13 when the reinforced concrete spacer 2 is in the second posture (Fig. 4(B)). It has a function to prevent it from sliding down from the shoulder.

2-3. Reinforcement Structure As shown in FIGS. 4A and 4B, four hollow portions 1D, 1D, 1D, 1D partitioned by ribs 1B, 1B have four corners 11, 11, 11, . . . It may be reinforced in an arc shape or build-up shape. According to such a reinforcing structure, it is possible to suppress the possibility of cracking at the joints between the ribs 1B, 1B and the main body 1A and at the intersections between the ribs 1B, 1B.

2-4. Regarding the bottom plate portion In addition, as shown in FIG. is formed longer than the depth length L3 of the side. According to such bottom plate portions 1E, 1E, even when the spacer for reinforced concrete 2 is used in either the first posture (Fig. 3(A)) or the second posture (Fig. 3(B)), , the depth of the hollow portions 1D, 1D, 1D, 1D can be narrowed while improving the posture stability of the spacer 1 for reinforced concrete (see FIG. 9).

2-5. About Dimensions Also, the dimensions of each part of the spacer for reinforced concrete 2 of the present embodiment are as follows, for example.

Side length L1 in the height direction in the first posture (= the width direction in the second posture): 70 mm
Side length L4 in the width direction in the first posture (=height direction in the second posture): 80 mm
Body side thickness T1: 3.5 mm
Rib thickness T2: 4mm
Groove depth d: 0.5 mm
Bottom plate depth length L2: 50 mm
Depth length L3 of sides other than the bottom plate part: 30 mm

That is, the reinforced concrete spacer 2 of the present embodiment is a 70×80 type reinforced concrete spacer in which the length L1 of the side in the height direction and the length L4 of the side in the width direction of the main body 1A are set to 70 mm and 80 mm, respectively. Spacer. Dimensions other than L1 and L4 are the same as those of the reinforced concrete spacer 1 of the first embodiment. Of course, the dimensions are not limited to this.

2-6. About Materials The materials of the main body 1A and the ribs 1B, 1B of the reinforced concrete spacer 2 are selected in the same manner as the materials of the reinforced concrete spacer 1 of the first embodiment.

2-7. Effects of the Second Embodiment The reinforced concrete spacer 2 of the second embodiment can be used in each of the first posture and the second posture. It is possible to make the height position of the reinforcing bar different between when it is used in different postures, and it is possible to obtain the same effect as the spacer for reinforced concrete 1 of the first embodiment in each posture.

3. Third Embodiment Next, an embodiment of a level indicator that can be attached to the reinforced concrete spacer 1 of the first embodiment will be described as a third embodiment. FIG. 5 is a perspective view showing a reinforced concrete spacer with a level indicator attached, FIG. 6 is a left side view of the level indicator, and FIGS. 6A to 6C are level indicators with level adjustment caps attached. Low level, medium level, and high level of the body are shown, respectively, and FIG. 6(D) shows the level indicator body with the level adjusting cap removed. 7(A) is a top view of the level adjustment cap, FIG. 7(B) is a left side view of the level adjustment cap, FIG. 7(C) is a bottom view of the level adjustment cap, and FIG. 7(D) is a level adjustment cap. FIG. 4 is a rear view of the adjustment cap; The level indicator body 3 of the present embodiment can be attached not only to the reinforced concrete spacer 1 of the first embodiment but also to the reinforced concrete spacer 2 of the second embodiment. The level indicator 3 can also be called a "level pillar".

3-1. Configuration of Level Indicator As shown in FIG. 5, the level indicator 3 of this embodiment is attached to the spacer 1 for reinforced concrete and used as an indicator of the concrete cover thickness. The level indicator body 3 has a mounting portion 3A for mounting on the upper side of the main body 1A, and a columnar level portion 3B extending from the mounting portion 3A for a predetermined length. Further, the level indicator body 3 is provided with a level adjustment cap 4 for adjusting the height by detachably attaching it to the level portion 3B.

As shown in FIGS. 6A to 6D, the mounting portion 3A of the level indicator 3 has a substantially U-shaped cross section with one side slightly short, and a claw provided at one end of the long side. The upper side 12 of the reinforced concrete spacer 1 is gripped from the width direction by the portion 5 and the barb portion 6 provided at the other end, and locked. The columnar level portion 3B has a cross-shaped cross section (FIG. 5), and convex (for example, hemispherical) stoppers 7, 7, 7 are formed at different height positions (FIG. 5). 6(D)). The size of the lowermost stopper 7 is set larger than the sizes of the upper stoppers 7,7.

On the other hand, as shown in FIGS. 7A to 7D, the level adjustment cap 4 has a cross-shaped cross-sectional hollow portion (receiving chamber of the columnar level portion 3B) that can be inserted into the upper end side of the columnar level portion 3B. have Further, as shown in FIG. 7(B), the level adjusting cap 4 is formed with a plurality of holes 8, 8, . . .

3-2. Regarding movement of the level adjustment cap First, when the operator attaches the level adjustment cap 4 to the upper end of the level portion 3B (Fig. 6(D)), the lowest hole portion 8 of the level adjustment cap 4 is the highest portion of the level portion 3B. The upper end of the level adjusting cap 4 is fitted to the upper stopper 7 (FIG. 6C), and the height position of the upper end of the level adjusting cap 4 is set to a predetermined height (maximum level).
When the operator pushes down the level adjustment cap 4 with a force greater than a certain level, the engagement is released, and the hole 8 positioned at a different height is engaged with the stopper 7, and the level adjustment cap 4 is pushed downward. The upper end of the adjusting cap 4 is set at another predetermined height.
Further, when the level adjustment cap 4 is pushed down by a certain amount or more, any two holes 8, 8 of the level adjustment cap 4 are fitted to the two stoppers 7, 7 of the uppermost stage and the next stage. (FIG. 6(B)), and the upper end of the level adjustment cap 4 is set at another predetermined height.
Furthermore, when the amount of pushing down the level adjusting cap 4 reaches the upper limit, the lower edge of the level adjusting cap 4 abuts against the lowermost stopper 7, so that the level adjusting cap 4 does not move further downward (FIG. 6). (A)), the upper end of the level adjustment cap 4 is set at another predetermined height.

Therefore, the operator pushes down the level adjustment cap 4 to gradually increase the length of overlap between the level adjustment cap 4 and the level portion 3B, thereby lowering the upper end of the level adjustment cap 4 step by step. (Fig. 6(C) -> (B) -> (A)), and conversely, by pulling up the level adjusting cap 4, the overlap length between the level adjusting cap 4 and the level portion 3B is gradually shortened. , the upper end portion of the level adjustment cap 4 can be raised stepwise (Fig. 6 (A) -> (B) -> (C)).

Therefore, the operator can adjust the height position of the upper end of the level adjusting cap 4 to an appropriate height simply by pushing down or pulling up the level adjusting cap 4 according to the target value of the concrete cover thickness.

3-3. Material The level indicator 3 (including the level adjustment cap 4) can be made of the same material (resin) as the spacer 1 for reinforced concrete, for example. Since the resin member exhibits moderate elasticity, it is possible to easily attach and detach the level indicator body 3 to and from the reinforced concrete spacer 1, adjust the height of the level adjustment cap 4, and the like. Of course, the material is not limited to this.

3-4. Effects of the Third Embodiment As described above, the level indicator body 3 according to the present embodiment has an effect that the concrete cover thickness can be indicated by attaching it to the spacer for reinforced concrete according to any of the embodiments.

4. Others As described above, preferred embodiments of the spacer for reinforced concrete and the level indicator body according to the present invention have been described. It goes without saying that various modifications and changes are possible within the scope of the gist of the invention.

1 Reinforced concrete spacer 2 Reinforced concrete spacer 1A Main body 1B Rib 1C Groove 1D Hollow part 1E Bottom plate part 11 Four corners 12 Side 13 Side 35 Reinforcing bar 60 Reinforced concrete spacer 70 Gap 80 Mortar L1 Length of side in height direction L2 Depth of bottom plate part Length L3 Side depth length d other than the bottom plate portion Groove depth T1 Body side thickness T2 Rib thickness

Claims (7)

In a reinforced concrete spacer for holding reinforcing bars at a predetermined height position,
a main body having a square tubular shape, the length of each side of which is set to the height at which the reinforcing bars should be arranged;
a cross-shaped rib provided inside the main body and formed so as to support the vicinity of the center of each side constituting the main body;
with
Reinforced concrete, characterized in that a plurality of non-slip grooves arranged in stripes are provided at least in the vicinity of the center of the upper surface of the main body on which the reinforcing bars are placed, for preventing the sideways sliding of the reinforcing bars. Spacer for In the spacer for reinforced concrete according to claim 1,
A spacer for reinforced concrete, characterized in that the corners of the hollow portion partitioned by the ribs are reinforced in a rounded shape or a built-up shape. In the reinforced concrete spacer according to claim 1 or 2,
A spacer for reinforced concrete, wherein a side serving as an installation surface of the main body is a bottom plate portion, and the depth length of the bottom plate portion is formed longer than the depth length of the other sides. In the reinforced concrete spacer according to claim 3,
The length of the sides in the height direction and the length of the sides in the width direction of the main body are different, and the grooves are provided on the surfaces of the two sides in the directions perpendicular to each other, and the grooves are provided on the two sides. A spacer for reinforced concrete, characterized in that two sides located opposite to each other are the bottom plate portions, respectively. In the reinforced concrete spacer according to any one of claims 1 to 4,
The main body and the ribs are made of polypropylene (PP), high-impact polystyrene (HIPS), polyethylene (PE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), ABS resin, or polycarbonate (PC). A spacer for reinforced concrete characterized by: A level indicator that is attached to the reinforced concrete spacer according to any one of claims 1 to 5 and serves as an indicator of concrete cover thickness,
a mounting portion for mounting on the upper side of the main body;
a level portion extending a predetermined length from the mounting portion;
A level indicator body characterized by comprising: In the level indicator body according to claim 6,
A level indicator body comprising a level adjustment cap detachably attached to the level section for height adjustment.

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