JP2011001688A - Spacer for arranging reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spacer for arranging a reinforcement, which enables the expectation of a sure anti-corrosive effect for the reinforcement to be arranged.SOLUTION: This spacer for arranging the reinforcement includes a supporting stand which is composed of a metal wire rod, and a ground contact block which is provided at the lower end of the leg portion of the supporting stand. A length from a ground contact surface of the ground contact block to a lower end of the leg portion of the supporting stand embedded in the ground contact block is 70 mm; the ground contact block is formed with high strength by compressively treating concrete or mortar, into which reinforced fibers are mixed; the plurality of supporting stands are arranged at predetermined spacings; a receiving rod for receiving the reinforcement is laid on the upper ends of the supporting stands; and one length-direction end of the receiving rod is protruded longer axially outward with respect to the supporting stand than the other length-direction end thereof.

Description

  The present invention provides a reinforcing bar reinforcing spacer, more specifically, when a concrete structure constituting a road surface of an elevated road or a floor of a building is manufactured, the reinforcing reinforcing bar of the concrete structure is supported, and the reinforcing The present invention relates to a spacer for reinforcing bar arrangement for maintaining a constant covering thickness of cast concrete with respect to the reinforcing bar.

  In general, when a concrete structure is laid on the road surface of an elevated road or the floor of a building, the reinforcing bar for supporting the reinforcing bar of the concrete structure and keeping the covering thickness of the cast concrete to the reinforcing bar constant. Bar arrangement spacers are used.

  This rebar reinforcement spacer basically has a support stand made of metal wire, and a resin material baked or a resin or mortar grounding block is attached to the lower end of the leg of the support stand. Have been proposed.

  By the way, when a concrete structure is laid on the embankment as the road surface of an elevated road using the above rebar reinforcement spacers, the support stand and the reinforcement reinforcement bars that have been arranged rusted due to the influence of moisture contained in the embankment. There was a problem that caused this.

  That is, in the above-described reinforcing bar arrangement spacer, the space between the lower end of the leg of the support stand and the embedding is not sufficiently secured, in other words, the lower end of the leg of the support stand is the grounding surface of the embankment. Since the ground block itself is conventionally formed at a low density, moisture contained in the embankment penetrates into the ground block due to capillary action, and the support stand Furthermore, there was a problem that the support stands and the reinforcing bars rusted along the reinforcing bars.

  In addition, the reinforcing bar spacer with resin material baked on the lower end of the leg of the support stand or attached with a resin grounding block has poor adhesion (adhesion) of the grounding block to the concrete base, so the support stand A gap is likely to form between the legs or grounding block of the concrete and the concrete matrix, so that moisture contained in the embankment also penetrates the gap between the legs of the support stand or the grounding block and the concrete matrix due to capillary action. In addition, there is a problem that the support stand and the reinforcing bar are rusted due to the support stand and the reinforcing bar.

  No. 7-32711

  The present invention was developed in view of the above circumstances, and the object of the present invention is to provide a reinforcing bar reinforcing spacer that can be expected to have a positive effect of preventing corrosion against reinforcing reinforcing bars. There is to do.

  According to the first aspect of the present invention, there is provided a reinforcing bar reinforcing spacer including a support stand made of a metal wire and a grounding block provided at a lower end of a leg of the support stand. The length to the lower end of the leg portion of the support stand embedded in the grounding block is at least 40 mm or more.

  According to a second aspect of the present invention, in the reinforcing bar reinforcing spacer according to the first aspect, the length from the grounding surface of the grounding block to the lower end of the leg portion of the support stand embedded in the grounding block is 65 mm. It is the above.

  The invention according to claim 3 is the reinforcing bar spacer according to claim 1 or 2, wherein the grounding block is formed with high strength by compressing concrete or mortar mixed with reinforcing fibers. It is characterized by that.

  According to a fourth aspect of the present invention, in the reinforcing bar reinforcing spacer according to the first, second, or third aspect, a plurality of the support stands provided with a grounding block are arranged at predetermined intervals, and these support stands A receiving rod for receiving reinforcing bars is installed on the upper end of the metal plate, and one end in the length direction of the receiving rod is protruded longer outward in the axial direction than the other end in the length direction. Features.

  According to the first aspect of the present invention, a sufficient length from the grounded surface at the lower end of the grounding block to the lower end of the leg portion of the support stand embedded in the grounding block is ensured, for example, on the embankment of an elevated road Since the moisture contained is suppressed from adhering to the support stand and the reinforcing reinforcing bars arranged on the supporting stand, the reinforcing reinforcing bars do not rust unintentionally.

  According to the second aspect of the present invention, the length from the grounding surface of the grounding block to the lower end of the leg portion of the support stand embedded in the grounding block is ensured to be 65 mm or more. It is possible to further suppress the moisture contained in the road embankment from adhering to the support stand and the reinforcing reinforcing bars arranged on the support stand.

  According to invention of Claim 3, since the said grounding block is formed in the high intensity | strength by compressing the concrete or mortar in which the reinforced fiber was mixed, for example, the concrete structure which comprises the road surface of an elevated road By using it for construction, the high affinity with the cast-in concrete is sufficiently maintained.For example, the moisture contained in the embankment of the elevated road is more attached to the support stand and the reinforcing reinforcing bar placed on this support stand. It can be further suppressed.

  According to the fourth aspect of the present invention, the plurality of support stands each having a grounding block are disposed at a predetermined interval, and a support bar for receiving a reinforcing bar is installed at the upper end of each support stand. In addition to the effect of the invention according to claim 1, 2 or 3, the one end in the length direction of the catching rod protrudes longer in the axial direction relative to the support stand than the other end in the length direction. As a matter of course, the reinforcing bar can be supported more stably, and when arranging a plurality of reinforcing bar reinforcing spacers in series, the extension part of the catch bar is connected to the adjacent reinforcing bar reinforcing spacer. By placing on the support stand, the space between the support stand and the grounding block provided on the support stand, which are opposed to each other with this extension, can be sufficiently increased. I lied to can be made to flow smoothly between these support stand, inadvertently can be prevented from voids generated around the ground block.

The perspective view which shows one Embodiment of the spacer for reinforcing bar arrangement concerning this invention. Same side view. FIG. The same enlarged front view. The expanded sectional view of the principal part. The expanded sectional view of the principal part. Explanatory drawing which shows the use condition of the reinforcing bar reinforcement spacer. Explanatory drawing which shows the use condition of the reinforcing bar reinforcement spacer.

  Hereinafter, one embodiment of the separator for formwork concerning the present invention is described in detail.

  1 is a perspective view of a reinforcing bar arrangement spacer, FIG. 2 is a side view of the reinforcing bar arrangement spacer, FIG. 3 is a plan view of the reinforcing bar arrangement spacer, and FIG. 4 is an enlarged front view of the reinforcing bar arrangement spacer. 5 and 6 are enlarged cross-sectional views of the main part of the reinforcing bar reinforcing spacer, and FIGS. 7 and 8 are explanatory views showing the usage state of the reinforcing bar reinforcing spacer.

  In the above figures, the reinforcing bar reinforcing spacer denoted by reference numeral 1 is provided at the lower ends of the five support stands 2 formed by bending a stainless steel metal wire into an inverted U shape and the left and right legs 20 of the support stands 2. A pair of left and right grounding blocks 3 and a receiving rod 4 for receiving reinforcing reinforcing bars installed on the upper end of a support stand 2 disposed at a predetermined interval are configured.

  The support stand 2 uses an iron metal wire having a circular cross section with a diameter of 7 mm.

  In addition, you may form this support stand 2 from a stainless steel material.

  And the lower end part of the right-and-left leg part 20 in this support stand 2 is compressed flat by press molding, and the retaining piece 21 is integrally formed.

  The grounding block 3 provided on the left and right legs 20 of the support stand 2 is formed in a substantially inverted truncated cone shape having a height H of 100 mm, an upper end diameter S1 of 30 mm, and a lower end diameter S2 of 20 mm.

  The grounding block 3 is made of concrete having the following mixing ratio.

That is, 950 kg of cement, 333 kg of water, 888 kg of fine aggregate, and 22 kg of glass fiber (reinforced fiber) are used per cubic meter of concrete.
And the grounding block 3 is formed in high density and high intensity | strength by the compression process by the compression strength 60N / square millimeter with respect to the concrete of the above mixture ratio.

  The reason why the grounding block 3 is formed from concrete with high strength is to maintain a high affinity with the cast concrete of the concrete structure C described later.

  The leg portion 20 of the support stand 2 is embedded downward from the upper end of the grounding block 3, and the leg portion 20 of the support stand 2 embedded in the grounding block 3 from the grounded surface 31 at the lower end of the grounding block 3. The length L to the lower end is set to 70 mm.

  That is, a plurality of reinforcing bar arrangement spacers 1 having different lengths from the grounded surface 31 at the lower end of the grounding block 3 to the lower end of the leg portion 20 of the support stand 2 embedded in the grounding block 3 are created. As a result of conducting a construction experiment on the concrete structure C constituting the road surface, the length from the grounded surface 31 at the lower end of the grounding block 3 to the lower end of the leg 20 of the support stand 2 embedded in the grounding block 3 When the length L is 30 mm, the moisture contained in the embankment A and the improved ground B was found to adhere to the support stand 2 or the reinforcing reinforcing bar K, whereas the grounded surface at the lower end of the grounding block 3 When the length L from 31 to the lower end of the leg 20 of the support stand 2 embedded in the grounding block 3 is 40 mm, the support stand 2 through the reinforcement of moisture contained in the embankment A and the improved ground B or reinforcement When the adhesion to the streak K is almost eliminated and the length L from the grounded surface 31 at the lower end of the grounding block 3 to the lower end of the leg 20 of the support stand 2 embedded in the grounding block 3 is 65 mm Since no adhesion of moisture contained in the embankment A or the improved ground B to the support stand 2 or the reinforcing reinforcing bar K was observed, the support stand embedded in the grounding block 3 from the grounded surface 31 at the lower end of the grounding block 3. The length L to the lower end of the second leg 20 is set to 70 mm in anticipation of safety.

  Further, the five support stands 2 are arranged at predetermined intervals, and the above-mentioned receiving rod 4 is constructed by welding at the upper end thereof. An extension 41 is provided in which one end in the length direction (left side in FIG. 2) protrudes longer in the axial direction than the other end in the length direction (right side in FIG. 2). ing.

  The case where the concrete structure C used as the road surface of an elevated road on the improved ground B laid in the upper surface of the embankment A is demonstrated using the reinforcing bar arrangement spacer 1 of the above structure.

  First, as shown in FIG. 7, a plurality of reinforcing bar arrangement spacers 1 are arranged in series on the improved ground B, and a plurality of reinforcing bar arrangement spacers arranged in series are arranged in parallel at predetermined intervals. Therefore, when arranging in series, as shown in FIG. 7, the extension 41 of the receiving rod 4 is placed on the support stand 2 of the adjacent reinforcing bar spacer 1.

  Subsequently, as shown in FIG. 7 and FIG. 8, after the reinforcing bar K is received and arranged on the rod 4, the concrete is put on the reinforcing bar K to form the concrete structure C.

  By the way, as described above, when arranging a plurality of reinforcing bar reinforcing spacers 1 in series, the extension 41 of the catch bar 4 is placed on the support stand 2 of the adjacent reinforcing bar reinforcing spacer 1. The support stands facing each other with the extension 41 interposed therebetween and the installation block 3 provided on these support stands can be sufficiently spaced, so that the concrete to be poured flows smoothly between the support stands.

  Thus, the grounding block 3 is made of high-strength concrete having a high affinity for the concrete base of the concrete structure C, and can be secured with respect to the concrete base. Since the length from the grounded surface 31 to the lower end of the leg 20 of the support stand 2 embedded in the grounding block 3 is sufficiently 70 mm, the moisture contained in the embankment A and the improved ground B is not Thus, it does not adhere to the support stand 2 etc. along the installation block 3.

  Therefore, it is possible to reliably prevent rust from being generated on the support stand 2, the catch bar 4, and the reinforcing reinforcing bars K arranged on the catch bar 4.

  For example, when the covering thickness of the cast concrete with respect to the reinforcing reinforcing bar K changes depending on the reinforcing arrangement of the concrete structure C, the height of the reinforcing bar reinforcing spacer 1 may be changed accordingly.

  In the above embodiment, the grounding block 3 is formed with high strength by compressing concrete, but may be formed with high strength by compressing mortar.

  In the above embodiment, five support stands 2 are used. However, the present invention is not limited to this. For example, eight support stands 2 may be used.

  In the above embodiment, the plurality of support stands 2 arranged at a predetermined interval are received and connected by the catch bar 4. However, the present invention is not limited to this. The reinforcing bar K may be directly placed on the upper end of the support stand 2.

DESCRIPTION OF SYMBOLS 1 Reinforcing bar arrangement spacer 2 Support stand 20 Leg 21 Stopping piece 3 Grounding block 31 Grounded surface 4 Retaining rod 41 Extension part K Reinforcing bar A Filling B Improved ground C Concrete structure

Claims (4)

In a reinforcing bar reinforcing spacer provided with a support stand made of a metal wire and a grounding block provided at the lower end of the leg of the support stand,
A spacer for reinforcing bar arrangement, wherein a length from a grounding surface of the grounding block to a lower end of a leg portion of the support stand embedded in the grounding block is at least 40 mm.   The spacer for reinforcing bar arrangement according to claim 1, wherein a length from a ground surface of the ground block to a lower end of a leg portion of the support stand embedded in the ground block is 65 mm or more.   The reinforcing bar spacer according to claim 1 or 2, wherein the grounding block is formed with high strength by compressing concrete or mortar mixed with reinforcing fibers.   A plurality of the support stands provided with a grounding block are arranged at predetermined intervals, and a support rod for receiving a reinforcing bar is installed on the upper ends of the support stands, and one end in the length direction of the support rod is the length of the support stand. The reinforcing bar reinforcing spacer according to claim 1, wherein the spacer is protruded longer outward in the axial direction than the other end in the axial direction.

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