JP2005076313A - Support for block used for formation of void slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support for a block used for the formation of a void slab capable of improving the flexibility of setting of a supporting position or a placing location of the block when the block is placed upward of the lower end reinforcement arranged on a slab form. <P>SOLUTION: The support (10) used in order to support each block upward of the lower end reinforcement (16) arranged on the slab form (14) for forming a reinforced concrete floor slab wherein a plurality of blocks (12) are embedded includes a leg (22), a projection (24) capable of thrusting the block extended upward from the leg and a collar (26) surrounding all or part around the projection. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention supports, when forming a reinforced concrete floor slab, a plurality of blocks embedded in the reinforced concrete floor slab above the slab formwork, more specifically, above the lower end rebar installed on the slab formwork. The present invention relates to a support used for the purpose.

  Instead of forming voids in the reinforced concrete floor slab, a lightweight block made of a foamed plastic material such as foamed polystyrene, which is a material different from the concrete, is embedded in the concrete, and the block is reinforced concrete. Making a substantial void formed in the floor slab is practiced.

  Prior to placing concrete on the slab formwork, the block is supported above the lower end reinforcing bar previously set on the slab formwork.

  Conventionally, in order to support the block, two grooves for receiving a part of the upper end reinforcing bar arranged above the lower end reinforcing bar on the top surface of the block placed on the lower end reinforcing bar Is provided (see Patent Document 1). Further, the block is provided with a plurality of through holes through which a plurality of rods extending through the slab form frame and extending in the vertical direction are passed, and the rod is further provided with a hook on which the block is placed. (See Patent Document 2).

  However, there is a problem that the support position or the arrangement position of the block is limited in the relationship between the groove and the through hole provided in the block, the upper end reinforcing bar and the rod.

JP 2002-266457 A JP 2001-3506 A

  An object of the present invention is to increase the degree of freedom of setting the support position or the arrangement position when arranging the block above the lower end reinforcing bar installed on the slab formwork.

  The present invention is a support tool used to support each block above a lower end reinforcing bar installed on a slab formwork for forming a reinforced concrete floor slab in which a plurality of blocks are embedded, and a leg, A protrusion extending upward from the leg and capable of being pierced into the block, and a hook surrounding all or part of the periphery of the protrusion.

  The leg can receive the upper reinforcing bar part and the lower reinforcing bar part from above at the intersection of the upper and lower reinforcing bar parts of the lower reinforcing bar part composed of a plurality of upper reinforcing bar parts and a plurality of lower reinforcing bar parts orthogonal to each other. And a reinforcing bar insertion space allowing these insertions, and a bottom surface capable of contacting the slab form.

The support tool may further include a pair of arm portions provided in the reinforcing bar insertion space of the leg and extending upward toward the other one. Both arm parts can be elastically deformed so that the lower reinforcing bar part passes upwardly between them, and can support the lower reinforcing bar part after passing.
Can do.

  According to the present invention, since the support has a protrusion that can be inserted into the block, and has a ridge around the protrusion, the block is inserted into the protrusions of the plurality of supports arranged on the slab formwork. Alternatively, by placing a plurality of support tools having protrusions pierced on the block on the slab mold frame, the block can be easily arranged at an arbitrary position on the slab mold frame. The wrinkles of the support tool limit the piercing of the block into the protrusion, and prevent the block from being inclined with respect to the slab formwork.

  In the legs of the support, a part of the upper and lower reinforcing bars intersecting each other of the lower end reinforcing bars can be received at these intersecting parts, and a space allowing the insertion thereof can be provided, and can be brought into contact with the slab formwork. When a certain bottom surface is provided, the support can be arranged on the slab form so as not to move in the horizontal direction by the lower end reinforcing bar. At this time, each support tool is disposed at each intersection of the upper and lower rebar portions, which is a predetermined place. The support of the block by these support tools is pierced into the protrusions of these support tools. Since the piercing position in the block can be arbitrarily selected, the arrangement position of the block can also be arbitrarily determined. Further, since the reinforcing bar insertion space of the leg is formed so that both reinforcing bar parts can be received from above, the leg is covered so that the crossing part of both reinforcing bar parts is covered with the support. The tool can be easily arranged.

  According to the support having a pair of arm portions, the rebar portions are received in the space of the legs through both arm members that are elastically deformed by pressing both arm portions against the lower rebar portions, and after passing both the rebar portions. The reinforcing bar portion can be supported on the arm member. As a result, the lower end reinforcing bar can also be supported at the upper position of the slab formwork by the block support.

  Referring to FIG. 1, a support according to the present invention is indicated generally by the numeral 10.

  The support 10 is used to support the block 12 (FIGS. 4 and 5) embedded in the reinforced concrete floor slab before placing the cast-in-place concrete when forming the reinforced concrete floor slab (not shown). It is done.

  The block 12 is formed of a material that contributes to weight reduction of the floor slab as the thickness of the reinforced concrete floor slab increases, for example, a foamed plastic material such as polystyrene foam.

  In order to form the reinforced concrete floor slab, a plate-like slab form 14 is installed, and a lower end reinforcing bar 16 is arranged above the slab form. The lower end reinforcing bar 16 has a lattice shape as a whole, and includes a plurality of lower reinforcing bar portions 18 and a plurality of upper reinforcing bar portions 20 which are assembled vertically and horizontally.

  The support 10 for supporting the block 12 is made of, for example, a plastic material. The leg 22, a protrusion 24 extending upward from the leg and capable of being pierced into the block 12, and a collar 26 surrounding the entire periphery of the protrusion 12. With.

  The illustrated leg 22 has two pairs of side surfaces 28 and 30 opposite to each other, the side surfaces 28 and 30 being adjacent to each other and orthogonal to each other, a space 32, and a flat bottom surface 36. .

  The space 32 opens to each pair of side surfaces 28 and 30 and a bottom surface 36. The opening of the space 32 has a substantially rectangular shape (FIG. 1) on the pair of side surfaces 28, an inverted U shape (FIG. 2) on the pair of side surfaces, and a rectangular shape (not shown) on the bottom surface. Present. The rectangular opening 34 on the side surface 28 and the inverted U-shaped opening 35 on the side surface 30 have such sizes that the lower reinforcing bar portion 18 and the upper reinforcing bar portion 20 can be inserted through the lower end reinforcing bar, respectively. It has a height dimension that is greater than the sum of the 18 and 20 diameters. For these reasons, the space 32 can receive both the reinforcing bar portions 18 and 20 from above at the intersection of the upper and lower reinforcing bar portions 18 and 20 and allows the both reinforcing bar portions 18 and 20 to be inserted.

  Therefore, the support 10 can be disposed on the slab form 14 from above the intersection so that the legs 22 cover the intersection of the two reinforcing bars 18 and 20 or straddle the intersection. .

  The space 32 may have semicircular portions 38, 40 having a diameter approximately equal to the diameter of the reinforcing bars 18, 20 at the top. According to this, rattling in the hole of the reinforcing bar portions 18 and 20 that are received by these radius portions 38 and 40 and are inserted through the radius portions can be prevented.

  The support leg 22 preferably has two pairs of arms 42. As shown in FIG. 1, the two pairs of arm portions 42 are spaced apart from each other in the axial direction of the lower reinforcing bar portion 18, more specifically, spaced apart from each other by a distance corresponding to the diameter of the upper reinforcing bar portion 20. Yes. Instead of the illustrated example in which the number of arms 42 is two pairs, the number of arms 42 can be one pair.

  Each pair of arm portions 42 extends obliquely upward from the base portion 43 located above the bottom surface 36 of the leg 22 toward the other, and is in contact with each other at their upper end portions 44. Each arm portion 42 may have a distal end portion 46 that further extends in an L shape from the upper end portion 44 as in the illustrated example.

  Each pair of arm portions 42 has a lower reinforcing bar portion 18 that is received in the space 32 when the leg 22 of the support member is disposed so as to straddle the intersection of the two reinforcing bar portions 18 and 20 and contact the slab formwork 14. The pair of arm portions 42 are elastically deformed at their base portions 43 and the upper end portions 44 are separated from each other. Next, a part of the reinforcing bar portion 18 that has passed through the upper end portion 44 of each pair of arm portions reaches the semicircular portion 40 of the space.

  The reinforcing bar 18 that reaches the semicircular portion 40 through the upper end 44 of each pair of arms is supported on the upper end 44 of the arm. At this time, the distal end portion 46 of the arm portion partially surrounds the reinforcing bar portion 18 and holds it. At the same time, the lower end reinforcing bar 16 is also supported at a position above the slab formwork 14.

  Next, the protrusion 24 of the support tool is composed of two tapered plate portions combined so as to exhibit a cross-shaped cross section in the illustrated example. As long as the protrusion 24 can pierce the block, the cross-sectional shape thereof is not limited.

  Further, the heel 26 of the support implements an action of limiting the amount of piercing of the protrusion 24 with respect to the block 12, that is, an action of receiving the block 12 at a predetermined height position.

  The flange 26 is composed of one or a plurality of plates surrounding a part of the periphery of the protrusion, instead of the illustrated example composed of one disk portion surrounding the entire periphery of the protrusion 24, and other than circular. It can have a planar shape such as a rectangle.

  Further, the height position of the flange 26 is set above or below the intermediate position in place of the illustrated example, which is positioned approximately in the middle of the height position of the protrusion 24 in consideration of the amount of piercing of the block 12 with respect to the protrusion 24. It can be arbitrarily determined.

  The illustrated block 12 is set to have a cross-sectional shape whose top surface is substantially part of a sinusoidal curve in order to reduce the noise level in the reinforced concrete floor slab. However, the block is not limited to the illustrated example, and may have any shape, for example, a rectangular parallelepiped shape.

  The block 12 is preferably supported by four supports 10 pierced from its bottom surface at its four corners. The arrangement position of the block 12 on the slab formwork 14 or the lower end reinforcing bar 16 can be determined by the piercing position of the block 12 with respect to the support 10 arranged at a predetermined position (the intersection of the lower end reinforcing bar 16).

  Moreover, the block 12 can also be arrange | positioned in the upper position of the lower end reinforcement 16 also by arrange | positioning the some support tool 10 pierced to the block 12 previously on the floor slab 14 or the lower end reinforcement 16.

  In the reinforced concrete floor slab including a plurality of blocks 12, after the plurality of blocks 12 are installed above the lower end reinforcing bars 16 by the support 10 according to the present invention, the upper end reinforcing bars 48 (see FIG. 5), the block 12 is fixed to the slab mold 14 by an appropriate fixing means (not shown), and then concrete is placed on the slab mold 14. The support 10 is embedded in the concrete together with the block 12.

  A pair of flaps 50 that extend horizontally from the open end to the inside of the semicircular portion 40 that receives the reinforcing bar portion 18 of the lower end reinforcing bar and face each other can be provided. When the flap 50 is elastically deformable and the diameter of the reinforcing bar 18 received in the semicircular portion 40 is smaller in the illustrated example, when both the flaps 50 are bent by the reinforcing bar, the elastic restoring force causes the reinforcing bar The portion is placed on the central axis of the semicircular portion 40.

  In order to reinforce the leg 22, each side face 30 is provided with an inverted U-shaped rib extending around the opening 35.

It is a front view of the support according to the present invention. It is a side view of a support tool. It is the longitudinal cross-sectional view obtained along line 2-2 of FIG. It is a longitudinal cross-sectional view of the slab formwork in which the block 12 and the support tool which supports this are arrange | positioned. It is the longitudinal cross-sectional view obtained along line 5-5 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support tool 12 Block 14 Slab formwork 16 Lower end reinforcement 22, 24, 26 Leg, protrusion, and collar of support tool 32 Space of leg part 42 Arm part

Claims (3)

A support tool used to support each block above a lower end reinforcing bar installed on a slab formwork for forming a reinforced concrete floor slab in which a plurality of blocks are embedded,
A support comprising a leg, a protrusion extending upward from the leg and capable of piercing the block, and a hook surrounding all or part of the periphery of the protrusion.   The lower end reinforcing bar includes a plurality of upper reinforcing bar portions and a plurality of lower reinforcing bar portions orthogonal to each other, and the leg includes the upper reinforcing bar portion and the lower reinforcing bar portion at the intersection of the upper and lower reinforcing bar portions. The support tool according to claim 1, further comprising: a reinforcing bar portion insertion space that is received from above and allows the insertion thereof, and a bottom surface that can contact the slab formwork. Furthermore, it is provided with a pair of arm parts provided in the reinforcing bar insertion space of the leg and extending upward toward each other, and both arm parts pass between them with the lower reinforcing bar part passing upward. The support tool according to claim 2, which can be elastically deformed and can support the lower reinforcing bar portion after passing.

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