JP4344374B2 - Rebar spacer - Google Patents

Description

This invention relates to reinforcing steel floor slab rebar for spacer for holding horizontally at a height position corresponding to the head size of the concrete on the deck with rebar truss plates.

Conventionally, various kinds of materials and various forms have been proposed as this type of reinforcing bar spacer. Considering that mass production is possible at low cost without generating rust, it is desirable to use a spacer made of synthetic resin.
Recently, as a synthetic resin spacer, a structure in which arc-shaped cutouts for placing an upper end stripe, a lower end stripe, and a setup stripe are provided at a plurality of upper and lower positions has been proposed (for example, see Patent Document 1). ).

JP 2006-177127 A

  However, the above-described spacer is only for supporting the reinforcing bar by fitting the reinforcing bar in the notch, and the function of restraining the reinforcing bar is insufficient, and the reinforcing bar may fall off. Further, since the notch arc is matched to the diameter of the reinforcing bar to be used, it is inconvenient if it is desired to use a reinforcing bar having a different diameter, and it is necessary to prepare a spacer for each diameter of the reinforcing bar.

  By the way, a deck plate with a reinforcing bar truss is used to construct a floor slab. A typical deck plate with a reinforcing bar truss has a structure in which a plurality of trusses composed of upper, lower and lower bars are arranged side by side on a metal substrate. As a deck plate of this type, in order to omit the lower end stripe, as shown in FIG. 8, a rib 11 that functions as the lower end stripe is integrally formed on a metal substrate 10, and a solid lattice lattice 12 is formed on the rib 11. Are spot-welded, and the upper end 13 is spot-welded on the lattice 12.

  When the above-described deck plate 1 with a reinforcing bar truss is used and a reinforcing bar for a floor slab is added, it is necessary to hold the reinforcing bar horizontally at a height position corresponding to the concrete cover size on the substrate 10. There is no reinforcing bar spacer that has a function of restraining a reinforcing bar and can handle reinforcing bars having different diameters.

  The present invention has been made paying attention to the above-mentioned problems, and has a function of restraining the reinforcing bar and can cope with reinforcing bars having different diameters. Further, the reinforcing bar for the floor slab can be easily provided on the deck plate with the reinforcing bar truss. The object is to provide a rebar spacer that can be expanded.

The reinforcing bar spacer according to the present invention is a concrete reinforcing member provided above a deck plate with a reinforcing bar truss, in which a plurality of ribs protrude from the upper surface of the board and a plurality of trusses including at least upper end bars and lattice bars are arranged side by side . This is a synthetic resin spacer for holding the reinforcing bars for the floor slab horizontally at a height according to the cover dimensions, and the engagement pieces that engage the left and right ribs of the board are integrated at both ends. A leg portion having a length corresponding to the cover size is provided at the center portion and both end portions of the lower surface of the provided substrate portion. A pair of holding plate portions that are provided with a concave groove along the width direction in which a part of the peripheral surface of the reinforcing bar fits in a central portion of the upper surface of the substrate portion, and that can be elastically deformed to sandwich the reinforcing bar at opposite positions across the concave groove Each holding plate portion has an outer wall portion that is integral with the substrate portion, and an inner wall portion that is formed by folding the upper end of the outer wall portion inwardly in a U shape, and each inner wall portion faces each other. The surface is formed with a retaining protrusion that is caught on the outer peripheral surface of the reinforcing bar.

In order to hold the reinforcing bar for the floor slab on the deck plate with the reinforcing bar truss using the reinforcing bar spacer having the above-described configuration, the reinforcing bar spacers are respectively arranged at positions of at least both ends of the reinforcing bar . In this case, the reinforcing bar spacer can be easily installed in a stable state on the deck plate with the reinforcing bar truss by engaging the engaging piece with the rib protruding from the upper surface of the substrate of the deck plate with the reinforcing bar truss. After installation of the reinforcing bar spacer , the reinforcing bar is inserted from above into the space between the holding plate parts facing the reinforcing bar spacer. By inserting the reinforcing bar, each holding plate part is pushed open and elastically deformed, and the reinforcing bar is fitted into the concave groove of the substrate part and supported.

Each holding plate part returns by elastic restoring force. If the diameter of the reinforcing bar is small, the lower end part of the inner wall part of each holding plate part comes into contact with the top part of the outer peripheral surface of the reinforcing bar. This restrains the reinforcing bars and prevents them from coming out upward.
For rebars with larger diameters, the inner wall of each holding plate elastically deformed outwardly returns by elastic restoring force and hits both sides of the outer peripheral surface of the reinforcing bar, and holding force by elastic restoring force acts on the inner wall. To do. As a result, the reinforcing bars are restrained, and the retaining protrusions of the respective inner wall portions are caught on the outer peripheral surface of the reinforcing bars, so that the reinforcing bars are prevented from coming off upward.
For rebars with larger diameters, the inner wall and outer wall of each holding plate are elastically deformed outward, and then return by elastic restoring force.The inner wall hits both sides of the outer peripheral surface of the rebar, and the inner wall The holding force by elastic deformation of the part and the outer wall part acts. As a result, the reinforcing bars are restrained, and the retaining protrusions of the respective inner wall portions are caught on the outer peripheral surface of the reinforcing bars, so that the reinforcing bars are prevented from coming off upward.

In a preferred embodiment of the present invention, the retaining protrusions are provided at different height positions on the substrate portion.
According to this embodiment, any retaining protrusion is caught on the outer peripheral surface of the reinforcing bar with different diameters, thereby preventing the reinforcing bar from coming off upward.

In another preferred embodiment of the present invention, each holding plate portion has a stopper capable of compressive deformation interposed between the outer wall portion and the inner wall portion.
According to this embodiment, when the reinforcing bar is inserted into the space between the holding plate portions, the stopper is compressed and deformed along with the elastic deformation of the inner wall portion of the holding plate portion, and the compressed and deformed stopper regulates the elastic deformation of the inner wall portion. Then, the outer wall portion is elastically deformed thereafter. For a reinforcing bar with a large diameter, a large holding force due to the elastic restoring force of the inner wall part and the outer wall part acts on both sides of the outer peripheral surface of the reinforcing bar.

When the reinforcing bar for floor slab is held by any of the above reinforcing bar spacers, the strength of the floor slab is increased by adding the reinforcing bar for floor slab , and the floor of the warehouse where heavy objects are stored, etc. A deck plate with a reinforcing bar truss can be adapted to applications that particularly require reinforcement of floor slabs.

Rebar for floor slab, which is held below the upper muscle by trusses or held by middle installed rebar for spacer installation position, or rebar for spacers installed at the installation position of the truss adjacent In particular, if you install rebars for floor slabs at the truss installation position, the rebar spacers and rebars will not get in the way during transportation or construction at the site, making it possible to assemble at the factory. The process at can be shortened.

The spacer for reinforcing bars according to the present invention has a function of restraining the reinforcing bars and can stably hold the reinforcing bars. In addition, reinforcing bars having different diameters also have a function of restraining the reinforcing bars, can cope with reinforcing bars having different diameters, and there is no need to manufacture a plurality of types according to the diameter of the reinforcing bars. Furthermore, since the reinforcing bar for the floor slab can be easily added to the deck plate with the reinforcing bar truss, it is possible to meet the demand for adding the reinforcing bar for the floor slab to the deck plate with the reinforcing bar truss.
In addition, a deck plate with a reinforcing bar truss to which reinforcing bars for floor slabs are added can be easily manufactured and the strength of the floor slab can be increased. In particular, it can be adapted to applications where floor slab reinforcement is required.
In addition, by engaging the engagement pieces with the ribs protruding from the top surface of the deck plate with the rebar truss, the rebar spacer can be easily installed in a stable state on the deck plate with the rebar truss. Can be easily added.

FIG. 1 shows a deck plate 1 with a reinforcing bar truss in a state where a reinforcing bar spacer 2 and a reinforcing bar 3 are held according to an embodiment of the present invention.
The reinforcing bar spacer 2 in the illustrated example holds the reinforcing bar 3 for the floor slab horizontally at a height corresponding to the concrete cover size on the deck plate 1 with the reinforcing bar truss. It can also be used to hold the floor slab rebar horizontally at a height corresponding to the concrete cover size on a formwork such as plywood.

Further, the reinforcing bar spacer 2 of this embodiment is configured to be able to hold three types of reinforcing bars having diameters of 10 mm, 13 mm, and 16 mm. However, the present invention is not limited to this, and two types of reinforcing bars or 4 It can also be set as the structure which can hold | maintain a kind of reinforcing bar.
In the following description, 30 indicates a reinforcing bar having a diameter of 10 mm, 31 indicates a reinforcing bar having a diameter of 13 mm, and 32 indicates a reinforcing bar having a diameter of 16 mm. ".

  The reinforcing bar spacer 2 in the illustrated example is a synthetic resin molded product, and as shown in FIGS. Corresponding lengths of leg portions 41, 42 and 43 are integrally provided. Each leg part 41-43 has the form of a hem spreading along the width direction of the board | substrate part 4. As shown in FIG. An outward horizontal piece 42a is integrally formed at the lower end of the leg part 42 at one end, and an inclined piece 42b is formed integrally at the tip of the horizontal piece 42a.

  Ribs 44a and 44b are integrally formed in the center of the width of the substrate portion 4, and a rib 45a continuous with the rib 44a is formed on one side surface of the leg portion 41 at the central position, and a rib 45b continuous with the rib 44b on the other side surface. Are integrally formed. The ribs 44a and 44b increase the bending rigidity of the substrate portion 4, and the ribs 45a and 45b increase the bending rigidity of the leg portion 41 at the center position.

  Engagement pieces 46 and 47 having spring elasticity that extend outward and bend downward are integrally formed on both side ends of the substrate portion 4. The tip of one engagement piece 46 extends to the position of the horizontal piece 42b of the leg portion 42. The tip of the other engagement piece 47 extends to a position before the lower end of the leg portion 43.

The board 10 of the deck plate with a reinforcing bar truss is formed of a galvanized steel plate, and a pair of left and right ribs 11, 11 inclined inwardly project from a position where each truss 14 is provided. Each rib 11 increases the bending rigidity of the substrate 10 and functions as a lower end line of the truss 14.
In this embodiment, the reinforcing bar 3 is held at an intermediate position between adjacent truss 14 and 14 positions, that is, a position where the truss 14 is not installed. The reinforcing bar spacer 2 is installed at the holding position of the reinforcing bar 3, and the engaging pieces 46 and 47 of the reinforcing bar spacer 2 are engaged with the inclined lower ends of the ribs 11 and 11. The inclined plate 42 c provided on the leg portion 42 at the one side end portion has an inclination angle that coincides with the inclination angle of the rib 11 and abuts on the outer surface of the rib 11.

  A concave groove 48 is formed along the width direction in which a part of the peripheral surface of the reinforcing bar 3 fits in the central portion of the length of the upper surface of the substrate portion 4. The concave groove 48 in the illustrated example is formed in a curved curved surface that is curved, but the shape thereof is not limited as long as the peripheral surface of the reinforcing bar 3 is fitted.

  A pair of holding plate portions 5, 5 that can be elastically deformed to hold the reinforcing bar 3 are provided upright at opposing positions on the upper surface of the substrate portion 4 with the concave groove 48 interposed therebetween. A space s into which the reinforcing bar 3 can be inserted is formed between them.

  Each holding plate portion 5 includes a vertical outer wall portion 50 integrated with the substrate portion 4 and an inner wall portion 51 formed by folding the upper end of the outer wall portion 50 inward in a U shape. The inner wall portion 51 extends obliquely downward, and the tip thereof is a predetermined height position above the substrate portion 4, that is, as shown in FIG. 4 (1), a reinforcing bar 30 having a diameter of 10 mm is inserted into the space portion s. Sometimes the length is set to reach the top of the rebar 30.

  A gap d exists between the outer wall portion 50 and the inner wall portion 51, and the inner wall portion 51 can be elastically deformed in a direction in which the gap d is narrowed (indicated by a dashed line X in FIG. 2). An elastic restoring force that attempts to return to the original shape acts on the elastically deformed inner wall portion 51. This elastic restoring force is as shown in FIG. 4 (2) when a 13 mm diameter rebar 31 is inserted into the space s, and when a 16 mm rebar 32 is inserted, it is as shown in FIG. 4 (3). As shown in FIG. 4, the reinforcing bars 31 and 32 act as holding forces.

  The outer wall portion 50 can also be elastically deformed and tilted outward (indicated by a one-dot chain line Y in FIG. 2), and the elastically deformed outer wall portion 50 has an elastic restoring force to return to the original shape. Works. This elastic restoring force acts as a holding force on the reinforcing bar 32 when the reinforcing bar 32 having a diameter of 16 mm is inserted into the space portion s (FIG. 4 (3)).

  On the opposing surface of each inner wall 51, a retaining protrusion 52 (see FIGS. 4 (2) and (3)) hooked on the outer peripheral surface of each of the reinforcing bars 31 and 32 having a diameter of 13 mm and 16 mm, and a reinforcing bar 32 having a diameter of 16 mm. The retaining protrusions 53 (see FIG. 4 (3)) that are caught on the outer peripheral surface of the substrate are integrally formed at different height positions on the substrate portion 4. The tips of the retaining protrusions 52 and 53 are pointed, and one retaining protrusion 52 projects larger than the other retaining protrusion 52.

  A stopper 6 capable of compressive deformation is interposed between the outer wall portion 50 and the inner wall portion 51 of each holding plate portion 5. The stopper 6 in the illustrated example has a string shape, and is compressed when the inner wall portion 51 is elastically deformed in the direction of narrowing the gap d, and is stretched when the inner wall portion 51 returns to the original shape. When the stopper 6 is contracted, the inner wall portion 51 is elastically deformed. However, when the stopper 6 is sufficiently compressed (see FIG. 4 (3)), the inner wall portion 51 cannot be elastically deformed any further, and thereafter The outer wall portion 50 is elastically deformed.

FIG. 5 shows a configuration of a reinforcing bar spacer 2 according to another embodiment of the present invention. FIG. 6 shows a reinforcing bar truss deck plate 1 in which the reinforcing bar spacer 2 is installed and the reinforcing bar 3 is held. Each is shown.
In the reinforcing bar spacer 2 of this embodiment, leg portions 41, 42, and 43 having lengths corresponding to the cover dimensions are integrally provided at the center portion and both side end portions of the lower surface of the substrate portion 4. Each leg part 41-43 is along the width direction of the board | substrate part 4, and is in the form of the hem spreading.

  Ribs 44a and 44b are integrally formed on the lower surface of the substrate portion 4, and a rib 45a continuous with the rib 44a is formed on one side surface of the leg portion 41 at the central position, and a rib 45b continuous with the rib 44b is formed on the other side surface. Are integrally formed. Ribs 46a and 46b continuous with the ribs 44a and 44b are integrally formed on the inner surfaces of the leg portions 42 and 43 at both end portions. The ribs 44a and 44b increase the bending rigidity of the base plate portion 4, the ribs 45a and 45b increase the bending rigidity of the leg portion 41 at the center position, and the ribs 46a and 46b increase the bending rigidity of the leg portions 42 and 43 at both end portions. .

The bottom plate portion 7 is integrally formed at the lower ends of the leg portions 41 to 43, and engaging pieces 46 and 47 that protrude outward from the leg portions 42 and 43 by a certain length are formed at both ends of the bottom plate portion 7. Each of the engaging protrusions 46 and 47 engages with the base end portion of the inclined rib 11 of the substrate 10.
As shown in FIGS. 7A and 7B, chamfered portions 73 and 74 are formed at diagonal positions of the engagement pieces 46 and 47, respectively. When installing the reinforcing bar spacer 2, the reinforcing bar spacer 2 is placed obliquely on the substrate 10 (FIG. 7 (1)), and then the reinforcing bar spacer 2 is rotated so that the engagement pieces 46 and 47 are connected to the base of the rib 11. When the end portion is engaged so that the rib 11 is slightly deformed and the elastic restoring force acts on the engagement pieces 46 and 47 (FIG. 7B), the engagement is made due to the presence of the chamfered portions 73 and 74. Is done easily and smoothly.

  A concave groove 48 is formed in the central portion of the upper surface of the substrate portion 4 along the width direction in which a part of the peripheral surface of the reinforcing bar 3 is fitted, and the reinforcing bar 3 is sandwiched between opposing positions sandwiching the concave groove 48. A pair of holding plate portions 5 and 5 that can be elastically deformed are provided upright. The configuration of the concave groove 48 and each holding plate portion 5 is the same as that of the embodiment shown in FIGS. 1 to 4. Here, the same reference numerals are assigned to corresponding portions, and detailed description thereof is omitted.

  In order to hold the rebar 3 for the floor slab on the deck plate 1 using the rebar spacer 2 having the above-described configuration, the rebar spacer 2 is installed at the positions of at least both ends of the rebar 3 and then each rebar is used. About the spacer 2, the reinforcing bar 3 is inserted into the space s between the opposing holding plate portions 5 and 5 from above. By inserting the rebar 3, the holding plate portions 5, 5 are pushed open and elastically deformed, and the rebar 3 is fitted and supported in the concave groove 48 of the substrate portion 4.

  Each of the holding plate portions 5 and 5 is restored by an elastic restoring force. For the reinforcing bar 30 having a diameter of 10 mm, the lower end portion of the inner wall portion 51 of each holding plate portion 5 is as shown in FIG. Each contact | abuts so that it may cover the top part of the outer peripheral surface of the reinforcing bar 30. This restrains the reinforcing bar 30 and prevents the reinforcing bar 30 from coming off upward.

  For the reinforcing bar 31 having a diameter of 13 mm, as shown in FIG. 4 (2), the inner wall 51 of each holding plate part 5 is elastically deformed outward and receives the reinforcing bar 31, and then returns by elastic restoring force. Abutting on both sides of the outer peripheral surface of the reinforcing bar 31, a holding force by the elastic restoring force of the inner wall portion 51 acts. As a result, the reinforcing bars 31 are restrained, and the retaining protrusions 52 at positions below the inner wall portions 31 are hooked on the outer peripheral surface of the reinforcing bars 31, so that the reinforcing bars 31 are prevented from coming off upward.

  For the reinforcing bar 32 having a diameter of 16 mm, as shown in FIG. 4 (3), after the inner wall 51 and the outer wall 50 of each holding plate part 5 are elastically deformed outward and receive the reinforcing bar 32, the elastic restoring force Accordingly, the inner wall portion 51 abuts on both sides of the outer peripheral surface of the reinforcing bar 32, and the holding force due to the elastic restoring force of the inner wall portion 51 and the outer wall portion 50 acts. As a result, the reinforcing bar 32 is restrained, and the upper and lower retaining protrusions 52 and 53 of the inner wall portions 51 are hooked on the outer peripheral surface of the reinforcing bar 32, so that the reinforcing bar 32 is prevented from coming off upward.

  The deck plate 1 with a reinforcing bar truss having the above-described configuration is manufactured and stored in advance in a factory or the like, and a necessary number of these are carried to the construction site and installed. Only the rebar spacer 2 may be installed in the factory in advance, and the rebar 3 may be held by the rebar spacer 2 at the construction site. However, the rebar spacer 2 is installed in the factory in advance and the rebar 3 is installed. It can also be held by the rebar spacer 2.

  After installing the required number of deck plates 1 with reinforcing bars in the construction site, concrete is placed on the deck plate 1 with reinforcing bars and a floor slab is constructed. At the time of temporary installation, the truss 14 functions as a suspension bone, and the substrate 10 supports the load while cooperating with the truss 14, and holds the fluid concrete so that it does not spill. At the time of actual installation, the upper end bars 13 and the reinforcing bars 3 serve as slab main bars of reinforced concrete to resist the tensile force generated by the moment.

It is a perspective view which shows the state which hold | maintained the reinforcing bar for slabs on the deck plate with a reinforcing bar truss using the reinforcing bar spacer which is one Example of this invention. It is a front view which shows the structure of the spacer for reinforcing bars which is one Example of this invention. It is a top view which shows the structure of the spacer for reinforcing bars which is one Example of this invention. It is a front view which shows the holding state of the reinforcing bar from which a diameter differs. It is a front view which shows the structure of the spacer for reinforcing bars which is the other Example of this invention. It is sectional drawing which shows the state which hold | maintained the reinforcing bar for slabs on the deck plate with a reinforcing bar truss using the reinforcing bar spacer of FIG. It is a top view which shows the method of installing the spacer for reinforcing bars of FIG. It is a perspective view which shows the structure of the deck plate with a reinforcing bar truss.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deck plate with a reinforcing bar truss 2 Reinforcing bar spacer 3 Reinforcing bar 4 Substrate part 5 Holding plate part 6 Stopper 10 Substrate 11 Rib 12 Lattice muscle 13 Top bar 14 Truss 41, 42, 43 Leg part 50 Outer wall part 51 Inner wall part 52, 53 Stop projection

Claims (3)

A height position according to the concrete cover size above a deck plate with a reinforcing bar truss with a plurality of ribs projecting on the upper surface of the board and a plurality of trusses including at least upper and lower bars on the board. In addition, it is a spacer for reinforcing bars made of synthetic resin to hold the reinforcing bars for floor slab horizontally,
A leg portion having a length corresponding to the cover size is provided at each of the center portion and both end portions of the lower surface of the substrate portion integrally provided with engagement pieces that engage with the left and right ribs of the substrate. A pair of holding plates that can be elastically deformed to sandwich the reinforcing bar are provided upright in the center of the upper surface of the steel bar. Each holding plate portion has an outer wall portion that is integral with the substrate portion, and an inner wall portion that is formed by folding the upper end of the outer wall portion inwardly in a U-shape. Is a spacer for rebar, in which a retaining protrusion is formed on the outer peripheral surface of the rebar.   The reinforcing bar spacer according to claim 1, wherein the retaining protrusions are provided at different height positions with respect to the upper surface of the substrate portion.   The reinforcing bar spacer according to claim 1, wherein each holding plate portion includes a stopper capable of compressive deformation interposed between the outer wall portion and the inner wall portion.

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