JP5999465B1 - Rebar spacer - Google Patents

Abstract

There is provided a spacer for a reinforcing bar that can be easily manufactured using a spring metal wire or plate, can be easily attached to the reinforcing bar, and can stably maintain a posture attached to the reinforcing bar. Reinforcing bar spacers S are reinforcing bar spacers S that are attached to intersecting portions of intersecting reinforcing bars to ensure the cover size of a concrete structure. The spacer main part 1 and the spacer main part 1 are fixed to the spacer main part 1. The spacer main portion 1 is composed of a pair of arm portions 4 and 4, and the spacer main portion 1 is a rebar that abuts against a formwork abutment surface 2 that abuts against a formwork 20 of a concrete structure to be constructed, and a rebar 10 on the near side. And a pair of arm portions 4 and 4 are fixed in a substantially U-shape in a direction away from the spacer main portion 1 and compressed and deformed by an external force. The hook portions 4a and 4a are made of an elastically deformable member whose opening angle of the letter shape is changed, and is engaged with the reinforcing bar 11 on the back side where the reinforcing bar 10 on the front side intersects on both sides of the reinforcing bar 10 on the near side. Have [Selection] Figure 1

Description

The present invention relates to a reinforcing bar spacer that is attached to an intersecting portion of intersecting reinforcing bars to secure a cover size of a concrete structure.

  2. Description of the Related Art Conventionally, in reinforced concrete work in the civil engineering / architecture industry, there is a reinforcing bar spacer that is used by being attached to a reinforcing bar in order to ensure the cover size of the concrete structure. As the main body of the reinforcing bar spacer, a material made of a cement-based material having a good affinity with concrete is often used from the viewpoint of emphasizing structural stability. Further, in order to attach the reinforcing bar spacer firmly and stably to the reinforcing bar, a spring metal wire or metal plate is used for the reinforcing bar attaching portion of the reinforcing bar spacer.

  For example, Patent Document 1 discloses a reinforcing bar spacer including a spacer block (main body) made of concrete or cement mortar and a mounting clip made of one spring metal wire. When the spacer block's base surface and both locking hooks of the mounting clip are brought into contact with the circumferential surface of the reinforcing bar and forcibly twisted and rotated, the both locking hooks gradually move the circumferential surface of the reinforcing bar. It expands and deforms so that it rides up, and is firmly fixed to the reinforcing bar by the restoring force (shrinkage elastic force) when getting over the longitudinal axis of the reinforcing bar. Therefore, it is said that a stable and strong mounting and use state in which there is no possibility of swinging and turning around the longitudinal axis of the reinforcing bar is obtained.

  Patent Document 2 discloses a reinforcing bar spacer that is made of concrete or cement mortar and is used by being attached to intersecting reinforcing bars. This reinforcing bar spacer is provided on the side of the groove part, a groove part formed with a concave curved surface that can contact the lower part of the reinforcing bar on the near side, a locking claw that holds the reinforcing bar in contact with the concave curved surface. It has a head part. A leaf spring material is used for the locking claw, and the head part has a contact part that can come into contact with the reinforcing bar on the back side. It is said that the posture attached to the reinforcing bar can be stably maintained.

Japanese Patent No. 3954610 Japanese Patent No. 4912501

  Since the main bodies of the reinforcing bar spacers of Patent Documents 1 and 2 are made of concrete or cement mortar, the affinity with the cast concrete is maintained. However, the reinforcing bar spacer disclosed in Patent Document 1 is troublesome, such as forcibly twisting and rotating the clip of the spring metal wire when attaching the mounting clip to the reinforcing bar, or unexpectedly with respect to the axis of the reinforcing bar. There was a problem that the rotation and dropout of the cover could occur and the cover size specified by the structure could be insufficient. Accordingly, there is a demand for a reinforcing bar spacer that is easy to mount and can stably maintain the posture attached to the reinforcing bar.

  In addition, the reinforcing bar spacer of Patent Document 2 can be attached to crossed reinforcing bars using a locking claw made of a leaf spring material, and can maintain a stable posture attached to the reinforcing bars. ), The structure is complicated, the weight is increased, and the production cost is increased. Therefore, a reinforcing bar spacer that can be easily manufactured with a simpler structure is desired.

  In view of the above problems, the present invention provides a reinforcing bar spacer that can be easily manufactured using a spring metal wire or plate, can be easily attached to a reinforcing bar, and can stably maintain a posture attached to the reinforcing bar. The purpose is to provide.

A reinforcing bar spacer according to the present invention is a reinforcing bar spacer that is attached to an intersecting portion of intersecting reinforcing bars to ensure a cover size of a concrete structure, and is a pair of spacers fixed to the spacer main part. The spacer main part has a formwork contact surface that contacts the formwork of the concrete structure to be constructed, and a reinforcing bar contact surface that contacts the reinforcing bar on the near side, The pair of arm portions are expanded and fixed in a substantially C shape in a direction away from the spacer main portion, and are elastically deformed members that are compressed and deformed by an external force to change the opening angle of the substantially C shape. In the state where the near side reinforcing bar is sandwiched, it has a hook part which engages with the far side reinforcing bar where the near side reinforcing bar intersects on both sides thereof.
Moreover, a finger pad can be provided at the tip of the pair of arms.
Further, the hook portion may be formed in a step shape in which circular shapes having a plurality of diameters that engage with the diameter size of the reinforcing bar on the back side are overlapped.
The hook portions of the pair of arm portions may be formed so as to engage with the circumferential surfaces of the back-side reinforcing bars from opposite directions.
Further, the reinforcing bar abutting surface may be formed as a concave surface, and the pair of arm portions may be fixedly provided on the protruding portion of the concave surface.

  The spacer for a reinforcing bar of the present invention can be easily manufactured using a spring metal wire or plate, can be easily attached to the reinforcing bar, and can stably maintain the posture attached to the reinforcing bar.

It is a perspective view of the spacer for reinforcing bars which concerns on the 1st Embodiment of this invention. It is a side view of the spacer for reinforcing bars shown in FIG. It is a top view of the spacer for reinforcing bars shown in FIG. It is a front view of the spacer for reinforcing bars shown in FIG. It is a rear view of the spacer for reinforcing bars shown in FIG. It is a top view of the board | plate material which comprises the arm part of the spacer for reinforcing bars shown in FIG. It is explanatory drawing explaining the attachment method of the spacer for reinforcing bars shown in FIG. It is a side view of the state which pressed the arm part shown in FIG. 7 from both sides. It is a top view of the state which pressed the arm part shown in FIG. 7 from both sides. It is an enlarged plan view of the hook part of the spacer for reinforcing bars which concerns on the 2nd Embodiment of this invention. It is a top view of the board | plate material which comprises the arm part of the spacer for reinforcing bars which concerns on the 3rd Embodiment of this invention. It is a perspective view of the spacer for reinforcing bars which concerns on the 4th Embodiment of this invention. It is a perspective view at the time of changing the shape of the spacer main part of the spacer for reinforcing bars which concerns on the 4th Embodiment of this invention. It is a perspective view of the spacer for reinforcing bars which concerns on the 5th Embodiment of this invention.

  Embodiments of the present invention (hereinafter referred to as “examples”) will be described below with reference to the drawings. In the following drawings, common parts are denoted by the same reference numerals, and duplicate descriptions for the same reference numerals are omitted.

  First, the configuration of the reinforcing bar spacer according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6, and the mounting method to the reinforcing bar will be described with reference to FIGS. The reinforcing bar spacer according to the present embodiment is a reinforcing bar spacer that is attached and fixed to an intersecting portion of intersecting reinforcing bars.

[overall structure]
FIG. 1 is a perspective view of a state in which the reinforcing bar spacer S of this embodiment is attached to a crossing portion of the reinforcing bar. The reinforcing bar spacer S includes a pair of arm portions 4 and 4 made of an elastically deformable member formed in a hook shape so that the tip engages with the reinforcing bar, and a spacer main portion 1 to which the pair of arm portions 4 and 4 are attached. Consists of In this embodiment, a spring metal plate is used as the elastic deformation member of the arm. The spacer main part 1 contacts the reinforcing bar 10 in front of the reinforcing bar spacer S, the pair of arms 4 and 4 are hooked on the reinforcing bar 11 on the back side of the reinforcing bar spacer, and the reinforcing bar spacer is the reinforcing bar 10, 11. To be fixed stably.

[Spacer main part 1]
2 to 5 are a side view, a plan view, a front view, and a rear view of the reinforcing bar spacer S shown in FIG. 1, respectively. The material of the spacer main part 1 is not particularly limited, but in this embodiment, concrete or cement mortar having a good affinity for the cast concrete is used. As shown in FIGS. 1 to 3, the spacer main portion 1 of the reinforcing bar spacer has a reinforcing bar abutment surface 3 that abuts against the reinforcing bar 10 on the near side. The spacer main portion 1 is provided with a reinforcing bar contact surface 3 in order to secure a distance between the formwork 20 of the concrete structure to be constructed and the side surface of the reinforcing bar 10, so-called pure fog (hereinafter referred to as “covering dimension”). The shape of the spacer main portion 1 is formed so that the horizontal distance from the mold contact surface 2 is equal to or greater than a specified fogging dimension (see the side view of FIG. 2 and the plan view of FIG. 3).

  The shape of the spacer main portion 1 is not particularly limited, but the reinforcing bar contact surface 3 and the mold contact surface 2 need to have a certain size in order to stably secure the cover size. The mold frame contact surface 2 may have a minimum size that does not shift the surface that contacts the mold frame, for example, a size of about 1 cm square centimeters when viewed from the back (see the rear view of FIG. 5). Further, as shown in FIG. 2, the reinforcing bar abutting surface 3 is larger than the formwork abutting surface 2 in order to stably fix the arm portions 4 and 4, and may be about 6 cm square centimeters in size, for example. . The shapes of the mold frame contact surface 2 and the reinforcing bar contact surface 3 are not limited to squares, but may be circular. However, in order to maintain stability, shapes that are symmetrical left and right in the rear view are preferable.

  When the reinforcing bar spacer S of the present invention is also used as a floor spacer, the formwork contact surface 2 of the spacer main portion 1 contacts the floor formwork or the discarded concrete on the bottom surface. Therefore, in this case, the larger the area of the mold contact surface 2 in contact with the bottom surface, the more stable. Therefore, it is preferable that the size is larger than the area of the rebar contact surface 3. Details will be described in Example 4. In the present embodiment, a description will be given of a reinforcing bar spacer S that is used in contact with a formwork for walls, not the formwork for floor, and the formwork contact surface 2.

  In general, in the construction of reinforced concrete, a binding wire (for example, a blunt iron wire) for binding the reinforcing bars 10 and 11 is wound around the intersection of the reinforcing bars 10 and 11 (not shown). When the reinforcing bar spacer S is attached to the reinforcing bars 10, 11, it is preferable to provide a concave part on the reinforcing bar contact surface 3 so as not to hit the binding wire of the reinforcing bars 10, 11 (not shown). By providing the concave surface portion, it is possible to stably contact the reinforcing bar 10 without hitting the binding wire of the reinforcing bars 10 and 11.

  As shown in FIGS. 1 and 3, a pair of arm portions 4, 4 are expanded and fixed in a substantially C shape in a direction away from the spacer main portion 1 in the spacer main portion 1 of this embodiment. . A pair of arm portions 4 and 4 made of an elastically deformable member are fixed to the reinforcing bar contact surface 3 of the spacer main portion 1 at the same height and symmetrically when viewed from the front (refer to the front view of FIG. 4). . Thereby, the spacer S for reinforcing bars is stably attached to the reinforcing bars 10 and 11. Further, even when a large external force is applied to the pair of arm portions 4 and 4 and compression deformation is performed, the pair of arm portions 4 and 4 is stably fixed without being separated from the spacer main portion 1, for example, The anchor 6 is welded to the four anchor mounting portions 6a and embedded in the spacer main portion 1, and the pair of arm portions 4 and 4 are fixed. The method for fixing the pair of arm portions 4, 4 to the spacer main portion 1 is not limited to the method using the anchor 6, and any method may be used.

  The pair of arm portions 4 and 4 of the spacer main portion 1 are symmetrically expanded in the direction away from the spacer main portion in a bilaterally symmetrical manner before being attached to the reinforcing bars 10 and 11, and are approximately The opening angle of the letter can be changed. At the time of attachment, the spacer main part 1 is brought into contact with the reinforcing bar 10, the opening angle of the arm parts 4, 4 is narrowed by an external force, and the arm part 4, 4 is placed on the reinforcing bar 11 on the back side when viewed from the reinforcing bar spacer S. The hook portions 4a and 4a are hooked and engaged, and then the opening angle of the arm portions 4 and 4 is widened and attached to the reinforcing bars 10 and 11. There is no conventional reinforcing bar spacer that is fixed by adjusting the opening angle of the arm portions 4, 4, but the reinforcing bar spacer S of the present invention is adjusted by adjusting the opening angle of the arm portions 4, 4. , 11 are points that are attached to the intersections.

[Arms 4, 4]
As shown in FIGS. 1 to 5, the pair of arm portions 4, 4 are fixed to the spacer main portion 1 so as to expand in a substantially square shape in a direction away from the spacer main portion 1. Any material can be used for the arms 4 and 4 as long as it is an elastically deformable member. In this embodiment, a metal plate having spring properties is used. Metal wires with spring properties may be used, but metal plates are more suitable, especially when the diameter of the rebar 11 on the back side is large (10 mm or more). ing.

  FIG. 6 is a plan view of a plate material constituting the pair of arm portions 4 and 4 of the reinforcing bar spacer S. FIG. As shown in FIG. 6, the pair of arm portions 4, 4 is preferably composed of one metal plate material, but may be composed of two metal plate materials. In this embodiment, one metal plate material is used. By using one metal plate material, simply welding one anchor 6 to the anchor mounting portion 6a at the center of the plate material constituting the pair of arm portions 4 and 4 and embedding it in the spacer main portion 1 to fix it, Easy to install. Moreover, since the comparatively big anchor 6 can be used, it becomes difficult to remove | deviate from the spacer main part 1 (refer the dotted line 6 of FIG. 3). Further, when viewed from the front (refer to the front view of FIG. 4), the pair of arm portions 4 and 4 are easily fixed to the reinforcing bar contact surface 3 of the spacer main portion 1 at the same height and symmetrically. The anchor 6 may be one that has already been formed on the plate material constituting the arm portions 4 and 4 (one that does not require welding).

  When the pair of arm portions 4 and 4 are formed of two metal plate materials, it is necessary to form each arm portion 4 with the same spring metal plate material so as to be symmetrical. Moreover, it is necessary to fix to the reinforcing bar contact surface 3 of the spacer main part 1 at the same height and symmetrically when viewed from the front (refer to the front view of FIG. 4). Furthermore, in order to make it difficult for the pair of arm portions 4 and 4 to come off, it is necessary to weld the anchor 6 to the plate material and to embed and fix the anchor 6 in the spacer main portion 1.

  In the single plate material constituting the arm portions 4 and 4 shown in FIG. 6, the portion that contacts the reinforcing bar abutting surface 3 is flat, but its both end sides are not flat but are expanded in a substantially C shape. It is a board material. Since the plate material is compressed and deformed by an external force, the arm portions 4 and 4 are pressed from both sides when being attached to the reinforcing bars 10 and 11 to be compressed and deformed, and a substantially square-shaped opening angle is narrowed. And the arm parts 4 and 4 are mounted | worn with the reinforcing bars 10 and 11 in the shape of a C as shown in FIG. 1 and FIG.

  As shown in FIG. 6, the pair of arm portions 4, 4 has hook portions 4 a, 4 a that are engaged with the rebar 11 on the back side. In the present embodiment, since the arm portions 4 and 4 are made of a plate-like material, the hook portions 4a and 4a are formed by notches provided in the plate-like material. The hook portion 4a is formed in a substantially semicircular shape so as to engage with the diameter size of the reinforcing bar 11 on the back side. The shape of the hook portion 4a is not limited to this, and may be any shape as long as the reinforcing bar 11 can be locked. Moreover, you may provide the latching claw 4c in the substantially semicircle tip of the hook part 4a. By providing the locking claw 4c, it is difficult to come off after the arm portions 4, 4 are engaged with the reinforcing bar 11.

  Furthermore, finger contact portions 4b and 4b can be provided at the tip portions of the hook portions 4a and 4a (both ends of the plate material in FIG. 6). As shown in FIGS. 1 and 3, the finger pad portions 4 b and 4 b are formed with an angle from the arm portions 4 and 4. By providing the finger contact portions 4b and 4b, it is easy to adjust the spring force of the arm portions 4 and 4 by pressing the arm portions 4 and 4 with a finger from the outside and changing the opening angle of the substantially C shape.

  The dimensions of the arm portions 4 and 4 need to be long enough to engage each of the hook portions 4a and 4a with the rebar 11 in a state where the arm portions 4 and 4 are in contact with at least the rebar 10 of the spacer main portion 1. Therefore, the dimensions of each arm part 4 are required to be at least the diameter of the reinforcing bar 10 and the diameter of the reinforcing bar 11, and the dimension of the finger rest part 4b and the degree of opening of each arm part 4 (angle). It is manufactured by adding dimensions according to. When each arm portion 4 is fixed at an angle of θ degrees from the reinforcing bar contact surface 3 of the spacer main portion 1, the minimum dimension x required for each arm portion 4 excluding the finger rest portion 4 b. Can be written as r / sin θ using the sum r of the diameter of the reinforcing bar 10 and the diameter of the reinforcing bar 11. For example, when each arm portion 4 is fixed at an angle of 30 degrees from the reinforcing bar contact surface 3 of the spacer main portion 1, the minimum dimension x required for each arm portion 4 is the diameter of the reinforcing bar 10 and the reinforcing bar. 11 times the total sum r of diameters. By setting it as such a dimension, the dimension of the arm parts 4 and 4 can be manufactured easily according to the magnitude | size of the various diameters of the reinforcing bars 10 and 11, and the opening angle of each arm part 4. FIG. The dimension of the arm parts 4 and 4 is not limited to this, For example, you may make the dimension of the finger rest part 4b longer (or shorter).

  As described above, the spacer main portion 1 of this embodiment can be manufactured considering only the cover size, and the arm portions 4 and 4 are the sum of the diameter of the reinforcing bar 10 and the diameter of the reinforcing bar 11, and each arm portion. Since it can be manufactured considering only the opening angle of 4, the reinforcing bar spacer S can be easily manufactured. As described above, since the components constituting the reinforcing bar spacer S are only the spacer main part 1 and the arm parts 4 and 4, they can be manufactured at low cost and can be mass-produced.

[installation method]
Next, a method for attaching the reinforcing bar spacer S to the reinforcing bars 10 and 11 will be described with reference to FIGS. FIG. 7 is an explanatory view for explaining a method of attaching the reinforcing bar spacer S of this embodiment, and FIG. 8 is a side view of the state in which the arm portions 4 and 4 of the reinforcing bar spacer S are pressed from both sides. 9 is a plan view thereof.

  In this embodiment, the reinforcing bar spacer S is attached in a state where the front reinforcing bar 10 is sandwiched between the arm parts 4 and 4 (in a state where the reinforcing bar is sandwiched between the hooks 4a, This is a dynamic attachment method in which the hook portions 4a and 4a are locked by a spring force while the arm portions 4 and 4 are pressed from both sides while the arms 4a are engaged and attached to the reinforcing bars 10 and 11.

  The state of the reinforcing bar spacer S in (1) of FIG. 7 is a state where no external force is applied to the pair of arm portions 4 and 4. First, as shown in FIG. 7 (1), the reinforcing bar contact surface 3 of the spacer main portion 1 is brought into contact with the reinforcing bar 10. At this time, the center of the reinforcing bar abutting surface 3 is brought into contact with the reinforcing bar 10 in a plan view of FIG. At this time, the reinforcing bar 10 is placed between the pair of arm parts 4 and 4 (the arm parts 4 and 4 sandwich the reinforcing bar 10).

  The state of the reinforcing bar spacer S in (2) of FIG. 7 is a plan view of FIG. 7 in which the pair of arms 4 and 4 are pressed by hand in the direction of the arrow from both sides. The opening angle is reduced to the minimum. At this time, since the arm portions 4 and 4 are manually pressed from both sides against the spring force of the pair of arm portions 4 and 4, a force corresponding to the spring force is required. The greater the width of the metal plate material of the arm portions 4 and 4 to be used, the greater the spring force and the greater the force required. When pressing the pair of arm portions 4 and 4 from both sides, it is easy to press the finger contact portions 4b and 4b. The pair of arm portions 4 and 4 are compressed and deformed by pressing from both sides, and the opening angle of the substantially C-shape is changed, for example, in a parallel state as shown in FIG. 7 (2) and FIG. Depending on the spring force of the pair of arms 4, 4, the angle may be larger (or smaller) than the parallel state.

  The state of (2) in FIG. 7 is a state in which the reinforcing bar abutting surface 3 of the spacer main portion 1 is in contact with the reinforcing bar 10, and as shown by the dotted line in the side view of FIG. Lift it up. By doing in this way, the opening angle of a pair of arm parts 4 and 4 can be changed, without hitting the reinforcing bar 11. Alternatively, as shown in FIG. 9, before the reinforcing bar contact surface 3 of the spacer main portion 1 is brought into contact with the reinforcing bar 10, the opening angle of the pair of arms 4 and 4 is narrowed in the direction of the arrow (for example, parallel). State), a holding member 5 that holds the angle constant may be used. In this case, it is preferable that the pair of arm portions 4, 4 is provided with a protrusion 4 e for locking the holding member 5.

  Next, as shown in FIG. 8, in a state where the pair of arms 4 and 4 are opened at a narrow angle (in a parallel state in this embodiment), the spacers are set so that the hooks 4a and 4a exceed the reinforcing bar 11. With the reinforcing bar abutting surface 3 of the main portion 1 being in contact with the reinforcing bar 10, it is lowered in the vertical downward direction (arrow direction). At this time, there is a gap between the hook portions 4 a and 4 a and the reinforcing bar 11. When the holding member 5 that holds the opening angle of the pair of arms 4 and 4 is used, after the hooks 4 a and 4 a are hooked on the reinforcing bars 11, the reinforcing bar contact surface 3 of the spacer main part 1 is connected to the reinforcing bars 10. Make a strong contact. As a result, the holding member 5 is detached from the pair of arm portions 4 and 4.

  Next, the force (pressing) that opens the pair of arm portions 4 and 4 to narrow the angle is removed, and the arm portions 4 and 4 are opened. When the holding member 5 is used, when the holding member 5 is detached from the pair of arm portions 4, 4, the arm portions 4, 4 are opened. (3) of FIG. 7 shows an open state (a state in which the opening angle is increased) of the pair of arm portions 4 and 4 by the spring force. After the opening, there is no gap between the hook portions 4a, 4a and the reinforcing bar 11, and the hook portions 4a, 4a engage with the reinforcing bar 11 by a spring force. Further, a force is applied to the finger pad portion 4b to push and spread the hook portions 4a and 4a along the reinforcing bar 11 and press the locking claws 4c and 4c against the reinforcing bar 11 to be locked. At this time, the arms 4 and 4 are locked so that the spring force is maximized.

  As described above, the reinforcing bar spacer S can be easily attached to the reinforcing bars 10 and 11. As described above, since the reinforcing bar abutting surface 3 of the spacer main portion 1 is in a state of being strongly attracted to the reinforcing bar 10 by the spring force of the arm portions 4 and 4, the reinforcing bar spacer S is stable. It can be held in a posture, and a specified fogging dimension can be secured. Moreover, since the hook parts 4a and 4a of the pair of arm parts 4 and 4 are manufactured so as to match the diameter of the reinforcing bar 11, the hook parts 4a and 4a can be reliably locked to the reinforcing bar 11. Furthermore, since the hook parts 4a and 4a are spread along the reinforcing bar 11 and the arm parts 4 and 4 are fixed to the reinforcing bar 11 with a spring force, they can be attached to the reinforcing bar 10 of any diameter without looseness.

  Further, since the reinforcing bar spacer S of this embodiment can be easily attached firmly to the reinforcing bars 10 and 11 with a spring force, for example, the binding wire is not wound around the intersection of the reinforcing bars 10 and 11. However, the reinforcing bars 10 and 11 can be attached while being firmly bound. Therefore, by using the reinforcing bar spacer S of the present embodiment, the work of winding the binding wire around the crossing portion of the reinforcing bars 10 and 11 that is currently required can be omitted, and the cover size can be secured, so that more efficient. Good construction is possible.

  In the present embodiment, the case where the front reinforcing bar 10 is vertical as viewed from the spacer main part 1 and the rear reinforcing bar 11 is horizontal has been described. However, the present invention is not limited to this case, and the front reinforcing bar is horizontal and the rear reinforcing bar 11 is horizontal. The same can be used when the side bars are vertical. In either case, the reinforcing bar spacer S is attached along the front reinforcing bar.

  Next, a reinforcing bar spacer S according to a second embodiment of the present invention will be described with reference to FIG. FIG. 10 is an enlarged plan view of the hook portion 4a of the reinforcing bar spacer S according to the second embodiment of the present invention. The difference from the first embodiment is only the shape of the plate material that constitutes the arm portions 4, 4, and thus the description of the shape of the plate material, particularly those other than the hook portions 4 a, 4 a is omitted. FIG. 10 is an enlarged plan view of the hook portion 4a of one arm portion 4 of the pair of arm portions 4 and 4. Similarly, the hook portion 4a of the other arm portion 4 is also formed symmetrically.

  As shown in FIG. 10, the hook portions 4 a and 4 a of the present embodiment are formed in a step shape in which circular shapes having a plurality of diameters that engage with the diameter size of the reinforcing bar 11 on the back side are overlapped. Although the diameter size of hook part 4a, 4a is not specifically limited, For example, it can form in the step shape with which the circular shape corresponding to the diameter of 10 mm, 13 mm, and 16 mm overlapped.

  Moreover, you may have the latching nail | claw 4c, 4c in the tip of hook part 4a, 4a similarly to Example 1. FIG. In the case of having the locking claws 4c and 4c, the locking claws 4c and 4c can be brought into contact with each other and locked regardless of the diameter of the reinforcing bar 11 formed in a step shape. In this way, the hook portions 4a and 4a can be used for the reinforcing bars 11 having various diameters by forming the hook portions 4a and 4a in a step shape in which circular shapes having a plurality of diameters are overlapped.

  Therefore, since the reinforcing bar spacer S of this embodiment can be applied to the reinforcing bars 10 and 11 having various diameters, it is not necessary to manufacture the reinforcing bar spacer S according to the size of each diameter of the reinforcing bars 10 and 11. The rebar spacers S can be of a minimum type, so that the manufacturing cost can be reduced.

  Next, a reinforcing bar spacer S according to a third embodiment of the present invention will be described with reference to FIG. FIG. 11 is a plan view of a plate material constituting the arm portions 4 and 4 of the reinforcing bar spacer S according to the third embodiment of the present invention. The difference from the first and second embodiments is only the shape of the plate material that constitutes the arm portions 4 and 4, and thus the description of the shape of the plate material, particularly the portions other than the hook portions 4 a and 4 a will be omitted.

  The reinforcing bar spacer S of the present embodiment is formed so that the hook parts 4a, 4a of the pair of arm parts 4, 4 engage with the circumferential surface of the rear reinforcing bar 11 from opposite directions. As shown in FIG. 11, the hook portions 4a and 4a are formed so as to engage with the circumferential surface of the same reinforcing bar, but in the plan view, one is on the upper side and the other is on the lower side with a notch. It is arranged. That is, the hook portions 4a and 4a are formed point-symmetrically with respect to the center of the plate material (center of the anchor attachment portion 6a).

  Since the hook portions 4a and 4a are formed symmetrically in this manner, the hook portions 4a and 4a can be locked to the circumferential surface of the reinforcing bar 11 from opposite directions, so that the spring force of the arm portions 4 and 4 is not only from the left and right but also from the top and bottom. Is also added symmetrically, which enables a stronger attachment to the reinforcing bars.

  A reinforcing bar spacer according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a perspective view of a reinforcing bar spacer S according to the fourth embodiment of the present invention, and FIG. 13 shows the shape of the spacer main portion 1 of the reinforcing bar spacer S according to the fourth embodiment of the present invention. It is a perspective view at the time of changing. In Examples 1 to 3, a spring metal plate material is used as the elastic deformation member of the arm portions 4 and 4, but in this embodiment, a spring metal wire material is used. Since the configuration other than the arm portions 4 and 4 is the same as that of the first to third embodiments, the description thereof is omitted.

  As in the case of the metal plate, the pair of arm portions 4 and 4 of the reinforcing bar spacer S are preferably made of one spring metal wire, but may be made of two metal wires. In this embodiment, one metal wire is used. By using one metal wire, one anchor 6 can be easily welded to the center of the metal wire constituting the pair of arm portions 4 and 4 and embedded in the spacer main portion 1. In the present embodiment, as shown in FIG. 12, the anchor 6 is formed by bending the center of the metal wire constituting the pair of arm portions 4, 4, and therefore does not need to be welded. As described above, the metal wires are more easily attached to the spacer main portion 1 than the metal plates of the arm portions 4 and 4, and the reinforcing bar spacer S can be easily manufactured.

  As in the case of the metal plate material, the pair of arm portions 4 and 4 made of the metal wire material are fixed to the reinforcing bar contact surface 3 of the spacer main portion 1 at the same height and symmetrically. When the pair of arm portions 4 and 4 are made of two metal wires, it is necessary to form each arm portion 4 with the same spring metal wire so as to be symmetrical. Further, the anchor 6 welded (or formed) to each arm portion 4 must be embedded in the spacer main portion 1 and fixed to the reinforcing bar contact surface 3 of the spacer main portion 1 at the same height and symmetrically.

  As shown in FIG. 12, a pair of metal wires constituting the arm portions 4 and 4 have both ends expanded in a substantially C shape. Since the metal wire is compressed and deformed by an external force, the arm portions 4 and 4 are pressed from both sides when they are attached to the reinforcing bars 10 and 11 to be compressed and deformed, and the opening angle of the substantially C-shape is narrowed, as shown in FIG. It is attached to the reinforcing bars 10 and 11 in the shape of a square.

  Similarly to the case of the metal plate material, the pair of arm portions 4, 4 has hook portions 4 a, 4 a that engage with the reinforcing bars 11, respectively. In this embodiment, since the arm portions 4 and 4 are made of a linear material, the hook portions 4a and 4a are formed by being bent. The hook portion 4a is formed so as to engage with the reinforcing bar 11, but as shown in FIG. 12, it is not necessarily formed in a substantially semicircular shape along the diameter of the reinforcing bar 11, and the reinforcing bar 11 is locked. Any shape is possible if possible. Moreover, the latching claws 4c and 4c (not shown) may be provided at the tip of the hook part 4a, and the finger contact parts 4b and 4b may be provided. By providing the finger contact portions 4b and 4b, it is easy to adjust the spring force of the arm portions 4 and 4 by pressing the arm portions 4 and 4 with a finger from the outside and changing the opening angle of the substantially C shape.

  In the present embodiment, the hook portions 4a and 4a of the arm portions 4 and 4 are formed so as to form an acute angle, and are not shaped along a specific circumference of the rebar 11, so that the diameter of the rebar 11 changes. It can be hooked at two places on the peripheral surface of the reinforcing bar 11. Therefore, it can be attached to the rebar 11 of any diameter. In addition, since the pair of arm portions 4 and 4 are spread along the reinforcing bar 11 and the arm portions 4 and 4 are fixed to the reinforcing bar 11 with a spring force, it can be attached to the reinforcing bar 10 of any diameter without looseness.

  Further, in this embodiment, since a spring metal wire is used for the arms 4 and 4, the spring force is weaker than when a spring metal plate is used. However, when the diameters of the intersecting reinforcing bars 10 and 11 are relatively small, the reinforcing bars 10 and 11 can be sufficiently firmly attached. Therefore, the reinforcing bar spacer S of this embodiment is preferably used.

  Furthermore, the reinforcing bar spacer S of this embodiment can also be used as a floor spacer. In that case, as shown in FIG. 13, the formwork contact surface 2 of the spacer main portion 1 contacts the floor formwork or the discarded concrete on the bottom surface. As described above, in the case of a floor spacer, the larger the area of the mold contact surface 2 that contacts the bottom surface, the more stable, and therefore, the spacer may be formed to have a size larger than the area of the reinforcing bar contact surface 3. Preferably, in this embodiment, the spacer main portion 1 is formed in a rectangular parallelepiped. Thus, by changing the shape of the spacer main part 1, the reinforcing bar spacer S can be stably fixed to the reinforcing bars 10 and 11, and the cover size can be secured.

  A reinforcing bar spacer according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 14 is a perspective view of a reinforcing bar spacer according to the fifth embodiment of the present invention. Also in the present embodiment, as in the fourth embodiment, a spring metal wire is used as the elastic deformation member of the arm portions 4 and 4. The difference from the first to fourth embodiments is that the reinforcing bar abutting surface 3 of the spacer main portion 1 is formed as a concave surface, and the arm portions 4 and 4 are fixedly provided on the protruding portion of the concave surface. In this embodiment, as shown in FIG. 14, the end portions (embedded portions) of the pair of arm portions 4 and 4 of the reinforcing bar spacer S correspond to the anchors 6 and 6, and the anchor attachment portions 6a and 6a are concave surfaces. This corresponds to the two protrusions. Since other configurations are the same as those in the first to fourth embodiments, the description thereof is omitted.

  Anchor mounting portions 6a and 6a (two protrusions) to which a pair of arm portions 4 and 4 made of a metal wire are fixed are formed at the same height and symmetrically. As shown in FIG. 14, the arm portions 4, 4 are widened in a substantially C shape and fixed to the anchor attachment portions 6 a, 6 a, and the arm portions 4, 4 are attached to the reinforcing bars 10, 11. 4 is pressed from both sides and is compressed and deformed, the opening angle of the substantially C-shape is narrowed, and is attached to the reinforcing bars 10 and 11 in a C-shape. Similarly to the fourth embodiment, the hook portions 4a and 4a of the pair of arm portions 4 and 4 are formed by bending a metal wire. The hooks 4a and 4a may have any shape as long as the reinforcing bar 11 can be locked. Moreover, you may provide the finger pad part 4b, 4b in the tip of the hook part 4a.

  In this embodiment, as described above, the reinforcing bar contact surface 3 of the spacer main portion 1 is formed as a concave surface, and the arm portions 4 and 4 are fixed to the two protrusions, so The arm portions 4 and 4 do not enter between the mold 20 of the concrete structure and the side surface of the reinforcing bar 10. That is, the space between the cover dimensions is made of only the concrete or cement mortar constituting the spacer main portion 1, and the metal wire does not enter.

  The cover size is originally provided in order to prevent the reinforcing bars of the reinforced concrete structure from being rusted due to the influence from the outside and to improve the durability. Concrete reacts with carbon dioxide in the air from the surface that comes into contact with air, and when neutralization progresses, the reinforcing bars in it rust and corrode, reducing the durability of the concrete. There is a need for as little metal as possible between the cover dimensions. Since the reinforcing bar spacer S of the present embodiment has a configuration in which the arm portions 4 and 4 (metal wire) are not included between the cover dimensions, the corrosion of the arm portions 4 and 4 can be prevented and the durability of the concrete is improved. be able to. Thereby, the durability of the reinforced concrete structure is also improved.

  Further, in the reinforcing bar spacer S of the present embodiment, the reinforcing bar contact surface 3 is formed in a concave surface even when a binding wire for binding the reinforcing bars 10 and 11 is wound around the intersection of the reinforcing bars 10 and 11. Therefore, it can be made to contact the rebar 10 stably without hitting the binding wire.

  As described above, in the reinforcing bar spacer of the present invention, the pair of arm portions are fixed and expanded in a substantially C shape in a direction away from the spacer main portion, and compressed and deformed by an external force. It consists of an elastically deformable member that can change the opening angle of the letter shape, and in the state of sandwiching the reinforcing bar on the near side, it locks to the reinforcing bar on the back side where the reinforcing bar on the near side intersects on both sides, so the spring force of the arm part It is easy to attach to the rebar using and can keep the posture attached to the rebar stable. Further, the cover size can be easily secured.

  In addition, the spacer main part of the present embodiment can be manufactured considering only the cover size, and the arm part can be manufactured considering only the sum of the diameters of the intersecting reinforcing bars and the opening angle of each arm part. Can be easily manufactured. As described above, since the parts constituting the reinforcing bar spacer are only the spacer main part and the arm part, they can be manufactured at low cost and can be mass-produced.

  Furthermore, by forming the hook portion of the arm portion into a step shape in which circular shapes having a plurality of diameters that engage with the diameter size of the reinforcing bar overlap, it can be used for reinforcing bars of various diameters. There is no need to manufacture reinforcing bar spacers according to the size, and the minimum number of types of reinforcing bar spacers is required, so that manufacturing costs can be reduced.

  Further, since the reinforcing bar spacer S can be configured such that the arm portion (metal wire) is not included between the cover dimensions, corrosion of the arm portion can be prevented and the durability of the concrete can be improved.

  In addition, the reinforcing bar spacer of the above-described embodiment is an example, and the configuration thereof can be appropriately changed without departing from the gist of the invention.

S Reinforcing bar spacer 1 Spacer main part 2 Formwork contact surface 3 Reinforcing bar contact surface 4 Arm part 4a Hook part 4b Finger pad part 4c Locking claw 4e Protrusion 5 Holding member 6 Anchor 6a Anchor mounting part 10 Front reinforcing bar 11 Back Side rebar 20 formwork

Claims (5)

Reinforcing bar spacers that are attached to the intersecting part of the intersecting reinforcing bars and ensure the cover size of the concrete structure, and comprising a spacer main part and a pair of arm parts fixed to the spacer main part,
The spacer main part has a formwork contact surface that contacts the formwork of the concrete structure to be constructed, and a reinforcing bar contact surface that contacts the reinforcing bar on the near side,
The pair of arm portions are expanded and fixed in a substantially C shape in a direction away from the spacer main portion, and are elastically deformed members that are compressed and deformed by an external force to change the opening angle of the substantially C shape. A reinforcing bar spacer comprising a hook portion that engages with a reinforcing bar on the back side where the reinforcing bar on the near side intersects with the reinforcing bar on the near side on both sides of the reinforcing bar on the near side.   The reinforcing bar spacer according to claim 1, wherein a finger pad is provided at a tip portion of the pair of arms.   3. The reinforcing bar spacer according to claim 1, wherein the hook portion is formed in a stepped shape in which circular shapes having a plurality of diameters that engage with a diameter size of the back-side reinforcing bar overlap. Reinforcing bar spacer.   The reinforcing bar spacer according to any one of claims 1 to 3, wherein hook portions of the pair of arm portions are formed so as to engage with circumferential surfaces of the back-side reinforcing bars from opposite directions. Reinforcing bar spacers.   The reinforcing bar spacer according to any one of claims 1 to 4, wherein the reinforcing bar contact surface is formed as a concave surface, and the pair of arm portions are fixedly provided on a protruding portion of the concave surface. Spacer.

Images