JP7662170B2 - Reinforcing bar spacer - Google Patents

Description

The present invention relates to a rebar spacer that is attached to the intersections of rebars assembled in a vertical and horizontal grid pattern in reinforced concrete construction in architecture and civil engineering to maintain a constant distance between the rebars and the formwork and ensure a sufficient cover thickness.

Conventionally, there have been a wide variety of reinforcing bar spacers of this type, but most of them are fitted or clamped between the vertical and horizontal bars at the intersections of the reinforcing bars (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Publication No. 58-17059 Japanese Utility Model Publication No. 57-20325

However, when attaching the reinforcing bar spacer described in the above patent document to the intersection of reinforcing bars, two actions must be performed: first, hook the hook-shaped locking part onto the horizontal bar, then twist (turn) the spacer body around the horizontal bar, and then fit the fitting part into the vertical bar. For this reason, there is room for improvement in terms of the speed of the installation work.

The technical objective of the present invention is to provide a reinforcing bar spacer that has been improved based on the current situation described above.

The present invention relates to a synthetic resin reinforcing bar spacer (10) to be attached to an intersection (Cr) of a reinforcing bar (R) formed by assembling a plurality of vertical bars (Ve) and horizontal bars (Ho) in a vertical and horizontal grid pattern, the spacer body (11) extending in the front-rear direction intersecting the horizontal bars (Ho), a vertical gutter-shaped fitting portion (12) into which the vertical bars (Ve) are detachably fitted by expanding and deforming, and a hook-shaped locking portion (13) formed with a hook-like tip facing in the forward opening direction of the fitting portion so as to hook and lock onto the horizontal bars (Ho). The spacer body (11) extends in the front-rear direction. and a connecting portion (15) connecting these support arm portions (14) (14), the locking portion (13) is provided on one or both of the pair of left and right support arm portions (14) (14) , the fitting portion (12) is located within an area partitioned in a U-shape in plan view by the pair of left and right support arm portions (14) (14) and the connecting portion (15), and is connected to the connecting portion (15) via a bridge portion (16) which allows the fitting portion (12) to deform and expand.

With the reinforcing bar spacer of the present invention, the opening direction of the engagement portion and the protruding direction of the hook-shaped portion of the locking portion are in the same direction, so the operation of hooking the locking portion onto the horizontal bar and the operation of fitting the engagement portion into the vertical bar can be performed in a single action. This makes the installation work much easier and more user-friendly.

In addition, if the fitting portion is connected to the spacer body via a bridge portion, the fitting portion can easily expand and deform when it is fitted into the vertical reinforcement. In other words, when the fitting portion is fitted into the vertical reinforcement, the presence of the bridge portion allows the fitting portion to expand and deform almost independently of the spacer body.

Therefore, with the reinforcing bar spacer of the present invention, it is possible to fit the fitting portion to the vertical bars of multiple nominal diameters (it goes without saying that the locking portion can be hooked onto the horizontal bars of multiple nominal diameters), making the reinforcing bar spacer of the present invention highly versatile.

Furthermore, when the fitting portion is fitted into the vertical reinforcement and the fitting portion is expanded and deformed, the expansion deformation is unlikely to affect the spacer body due to the presence of the bridge portion. Therefore, even in this state, the spacer body does not warp and the gap between the reinforcing bar and the formwork can be kept constant, and an appropriate cover thickness can be obtained.

FIG. 2 is a perspective view of the reinforcing bar spacer in use, viewed from diagonally above and in the front. FIG. 2 is a plan view showing the reinforcing bar spacer in use. FIG. 2 is a front view of the reinforcing bar spacer. FIG. 2 is a rear view of the reinforcing bar spacer. FIG. 2 is a plan view of the reinforcing bar spacer. FIG. 2 is a bottom view of the reinforcing bar spacer. FIG. 2 is a left side view of the reinforcing bar spacer. FIG. 2 is a right side view of the reinforcing bar spacer. FIG. 11 is a perspective view showing another example of a reinforcing bar spacer in use, as viewed from diagonally above and in front. 13 is a plan view showing another example of the left and right support arm portions. FIG. FIG. 11 is a plan view showing a first alternative example of a fitting portion and a bridge portion. FIG. 11 is a plan view showing a second modified example of the fitting portion and the bridge portion.

Next, an embodiment of the present invention will be described with reference to the drawings. In the embodiments and claims, terms such as "front-back," "left-right," and "up-down" are used to specify directions; in this case, the longitudinal direction of the horizontal stripes Ho is defined as the left-right direction, the horizontal direction that intersects (is perpendicular to) the left-right direction is defined as the front-back direction, and the direction in which the vertical stripes Ve extend is defined as the up-down direction. These terms are used merely for convenience of explanation and do not limit the technical scope of the present invention.

As shown in Figures 1 to 8, the reinforcing bar spacer 10 is made of synthetic resin and is attached to the intersections Cr of reinforcing bars R, which are made up of multiple vertical bars Ve and horizontal bars Ho assembled in a vertical and horizontal grid pattern, in reinforced concrete construction in architecture and civil engineering to maintain a constant distance between the reinforcing bars R and the formwork F and ensure a sufficient cover thickness.

The size (nominal diameter) of the reinforcing bars R (vertical bars Ve and horizontal bars Ho) to which the reinforcing bar spacer 10 is attached is not particularly limited. The reinforcing bar spacer 10 in the embodiment is exemplified as one used in reinforced concrete that constitutes the foundation of a house, and can be attached to the intersections Cr of reinforcing bars R that are assembled in a vertical and horizontal grid pattern of horizontal bars Ho with a nominal diameter of 10 to 22 mm and vertical bars Ve with a nominal diameter of 10 to 13 mm.

The reinforcing bar spacer 10 comprises a spacer body 11 that extends in the front-rear direction intersecting with the horizontal bars Ho, a vertical gutter-shaped fitting portion 12 into which the vertical bars Ve are detachably fitted, and a hook-shaped locking portion 13 that faces in the opening direction of the fitting portion 12 (in this embodiment, the front direction) so as to hook onto and lock onto the horizontal bars Ho.

The spacer body 11 of the embodiment has a pair of left and right support arms 14, 14 extending in the front-rear direction, and a connecting portion 15 connecting the pair of left and right support arms 14, 14. The pair of left and right support arms 14, 14 are arranged in parallel with an appropriate gap in the left-right direction. The rear end side of the left support arm 14 and the mid-front and rear portions of the right support arm 14 are connected together via the connecting portion 15.

When the reinforcing bar spacer 10 is attached to the intersection Cr of the reinforcing bars R, the tip side of each support arm portion 14 (the front end side of the left support arm portion 14 and the rear end side of the right support arm portion 14) can abut against the concrete formwork F. In the embodiment, the left support arm portion 14 extends forward and the right support arm portion 14 extends backward, so that they extend in alternate directions, but this is not limited thereto. For example, the rear side of the left support arm portion 14 may be extended backward and the front side of the right support arm portion 14 may be extended forward, so that the positions of the front ends and the positions of the rear ends of the left and right support arms 14, 14 are aligned (see FIG. 10).

As described above, the fitting portion 12 in this embodiment is in the form of a vertical gutter into which the vertical muscle Ve is detachably fitted, and is disposed within an area surrounded by a pair of left and right support arm portions 14, 14 and the connecting portion 15. The fitting portion 12 is connected to the spacer body 11 via a bridge portion 16. In this case, the rear side of the fitting portion 12 facing the connecting portion 15 and the connecting portion 15 are integrally connected via the bridge portion 16.

A vertically long opening groove 17 is formed on the front side of the fitting portion 12, which is located opposite the connecting portion 15. In other words, the fitting portion 12 opens forward. In this embodiment, a cutout portion 18 that is wedge-shaped in plan view (bottom view) is formed in the fitting portion 12 and the bridge portion 16. In other words, the combination of the fitting portion 12 and the bridge portion 16 is bifurcated into two parts separated to the left and right by the cutout portion 18.

For this reason, when the fitting portion 12 is fitted into the vertical muscle Ve, the fitting portion 12 can expand and deform almost independently of the spacer body 11 (the connecting portion 15 in this embodiment) due to the presence of the bridge portion 16. In particular, because the combination of the fitting portion 12 and the bridge portion 16 is bifurcated to the left and right, the fitting portion 12 can easily expand and deform when fitted into the vertical muscle Ve. In addition, due to the presence of the bridge portion 16, the influence of the expansion deformation is unlikely to extend to the connecting portion 15 and ultimately the spacer body 11.

On the inner surface of the left and right support arm parts 14, in front of the opening groove 17, there is formed a retaining piece 19 that extends toward the opening groove 17. The retaining pieces 19 are for preventing the vertical muscle Ve fitted into the fitting part 12 from coming off, and are configured as a pair on the left and right. The pair of left and right retaining pieces 19, 19 are formed in a V-shape in a plan view (bottom view) so that the left-right distance narrows toward the opening groove 17. The space between the pair of left and right support arm parts 14, 14 forms a passage through which the vertical muscle Ve passes, and the distance of the passage can be expanded and opened with the base end side of each retaining piece 19 as a fulcrum by inserting the vertical muscle Ve through it.

As described above, the locking portion 13 in this embodiment is formed in a hook shape facing the opening direction of the fitting portion 12 (forward in this embodiment) so as to hook onto and lock onto the horizontal bar Ho. In this case, the locking portion 13 is disposed on the upper surface side of the right support arm portion 14 and in the vicinity of the fitting portion 12, and is configured in a forward-facing hook shape (inverted L-shape when viewed from the side) with a vertical piece 20 protruding upward from the upper surface side of the right support arm portion 14 and a horizontal piece 21 protruding forward from the top of the vertical piece 20.

In this case, the horizontal bar Ho is inserted into the area surrounded by the locking portion 13 (vertical piece 20 and horizontal piece 21) and the front side of the upper surface of the right support arm portion 14, and the horizontal piece 21 rests on the horizontal bar Ho, causing the locking portion 13 to hook onto and lock onto the horizontal bar Ho.

It is also possible to turn the reinforcing bar spacer 10 upside down and attach it to the intersection Cr of the reinforcing bars R (see Figure 9). In this case, the horizontal bar Ho is still inserted into the area surrounded by the locking portion 13 (vertical piece 20 and horizontal piece 21) and the front side of the upper surface of the right support arm portion 14, but the front side of the right support arm portion 14, not the horizontal piece 21, rests on the horizontal bar Ho.

In this embodiment, a stopper piece 22 that overlaps with the vertical piece 20 of the locking portion 13 in a side view is provided on the rear side of the upper surface of the left support arm portion 14 and protrudes upward. The vertical piece 20 of the locking portion 13 and the stopper piece 22 are arranged on both the left and right sides of the fitting portion 12. When the reinforcing bar spacer 10 is attached to the intersection portion Cr of the reinforcing bar R, both the vertical piece 20 and the stopper piece 22 arranged on both the left and right sides of the fitting portion 12 can abut against the horizontal bar Ho. This restricts the rotation of the reinforcing bar spacer 10 around the vertical bar Ve. It is also possible to replace the stopper piece 22 with the locking portion 13 and configure a pair of left and right locking portions 13, 13.

In the embodiment of the reinforcing bar spacer 10, the opening direction of the engagement portion 12 and the protruding direction of the hook-shaped portion (horizontal piece 21) of the locking portion 13 face in the same direction (forward in this embodiment), so the operation of hooking the locking portion 13 onto the horizontal bar Ho and the operation of fitting the engagement portion 12 into the vertical bar Ve can be performed in a single action. This makes the installation work much easier and more user-friendly.

In addition, because the fitting portion 12 is connected to the spacer body 11 (the connecting portion 15 in this embodiment) via the bridge portion 16, the fitting portion 12 can easily expand and deform when fitted into the vertical bar Ve. In other words, when the fitting portion 12 is fitted into the vertical bar Ve, the presence of the bridge portion 16 allows the fitting portion 12 to expand and deform almost independently of the spacer body 11.

Therefore, the fitting portion 12 can be fitted to vertical bars Ve of multiple nominal diameters (it goes without saying that the locking portion 13 can be hooked onto horizontal bars Ho of multiple nominal diameters), making the reinforcing bar spacer 10 highly versatile.

Furthermore, when the fitting portion 12 is fitted into the vertical reinforcement Ve and the fitting portion 12 is expanded and deformed, the influence of the expanding deformation is unlikely to extend to the spacer body 11 (in this embodiment, the pair of left and right support arm portions 14, 14 and the connecting portion 15) due to the presence of the bridge portion 16. Therefore, even in this state, the spacer body 11 does not warp and the distance between the reinforcing bar R and the formwork F can be maintained constant, and an appropriate cover thickness can be obtained.

The configuration of each part of the present invention is not limited to the illustrated embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, as shown in the first variant of FIG. 11, there may be one bridge part 16 for the fitting part 12, or as shown in the second variant of FIG. 12, there may be two or more. It is preferable that the bridge part 16 is located as far away as possible from the opening groove 17 of the fitting part 12. In this way, the bridge part 16 does not get in the way, and the fitting part 12 can easily expand and deform.

Cr Intersection F Formwork Ho Horizontal bar R Reinforcing bar Ve Vertical bar 10 Reinforcing bar spacer 11 Spacer body 12 Fitting portion 13 Locking portion 14 Support arm portion 15 Connecting portion 16 Bridge portion 17 Opening groove 18 Cutout portion 19 Stopper piece 20 Vertical piece 21 Horizontal piece 22 Stopper piece

Claims (1)

A synthetic resin reinforcing bar spacer (10) is attached to an intersection (Cr) of a reinforcing bar (R) that is assembled in a vertical and horizontal grid pattern of a plurality of vertical bars (Ve) and horizontal bars (Ho),
The spacer includes a spacer body (11) extending in the front-rear direction intersecting the horizontal reinforcement (Ho), a vertical gutter-shaped fitting portion (12) into which the vertical reinforcement (Ve) is detachably fitted by expanding and deforming, and a hook-shaped locking portion (13) having a tip facing in the forward opening direction of the fitting portion so as to hook and lock onto the horizontal reinforcement (Ho),
The spacer body (11) has a pair of left and right support arm portions (14), (14) extending in the front-rear direction and a connecting portion (15) connecting these support arm portions (14), (14), and the locking portion (13) is provided on one or both of the pair of left and right support arm portions (14), (14) ,
The fitting portion (12) is located within an area partitioned in a U-shape in plan view by the pair of left and right support arm portions (14), (14) and the connecting portion (15), and is connected to the connecting portion (15) via a bridge portion (16) that allows the fitting portion (12) to be expanded and deformed.
Rebar spacers (10).

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