Supporting formwork to rebar for concrete forms

Patent metadata

Field	Value
Publication number	US-11142919-B2
Application number	US-201815923292-A
Country	US
Kind code	B2
Filing date	Mar 16, 2018
Priority date	Mar 16, 2018
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A central rod passes through a form-board. A first disc is attached to a first end of the central rod. The first disc abuts to a first side the form-board. A second disc is attached to the central rod between the first end of the central rod and a second end of the central rod. The second disc abut to a second side of the form-board opposite the first side. A third disc, attached the second end of the central rod, is configured to receive a rebar rod.

First claim

What is claimed is:

1. A rebar chair-tie comprising:
a central rod passing through a form-board;
a first disc attached to a first end of the central rod, the first disc abut to a first side the form-board;
a second disc attached to the central rod between the first end of the central rod and a second end of the central rod, the second disc abut to a second side of the form-board opposite the first side; and
a third disc attached to the second end of the central rod and comprises a contoured central hub configured to receive a rebar rod, four slots radially extending out from the contoured central hub, the slots configured to receive a wire-tie, and an attachment device within the central hub.

2. The rebar chair-tie of claim 1 , wherein the central rod is an all-thread rod.

3. The rebar chair-tie of claim 1 , wherein the central rod comprises metal.

4. The rebar chair-tie of claim 1 , wherein the first disc and the second disc are identical to the third disc.

5. The rebar chair-tie of claim 1 , wherein the attachment device comprises a threaded connection formed through the central hub.

6. The rebar chair-tie of claim 5 , wherein the threaded connection is perpendicular to a contour on the contoured central hub, the contour configured to receive a rebar rod.

7. The rebar chair-tie of claim 1 , wherein the first disc and the second disc each comprise a flat side configured to abut a form-board.

8. The rebar chair-tie of claim 1 , wherein the first disc, the second disc, and the third disc all comprise a plastic.

9. A method comprising:
providing a rebar chair-tie comprising a central rod;
supporting a form-board to a central rod by compressing two discs on either side of the form-board, the central rod passing through and being secured to both discs, the central rod passing through the form-board;
securing a third disc to a distal end of the central rod, wherein the third disc comprises a contoured central hub configured to receive a rebar rod, four slots radially extending out from the contoured central hub, the slots configured to receive a wire-tie, and an attachment device within the central hub; and
securing the rebar chair-tie secured to the distal end of the central rod to the rebar rod.

10. The method of claim 9 , further comprising cutting the central rod to a specified length prior to supporting the rebar.

11. The method of claim 9 , wherein securing a rebar chair-tie comprises securing the rebar rod with a twisted wire threaded through slots in the rebar chair-tie.

12. The method of claim 9 , further comprising shooting shotcrete over the secured rebar rod.

13. The method of claim 12 , wherein shooting shotcrete can include shooting dry or wet shotcrete.

14. The method of claim 12 , further comprising:
removing the form-board from the rebar rod after the shotcrete has cured; and
cutting the central rod to be flush with the cured shotcrete.

15. A system comprising:
a form-board configured to support and retain curing concrete;
a plurality of rebar chair-ties arranged in a pattern to support the form-board to a rebar lattice, each of the plurality of rebar chair-ties comprising:
a central rod passing through the form-board;
a first disc attached to a first end of the central rod, the first disc abut to a first side the form-board;
a second disc attached to the central rod between the first end of the central rod and a second end of the central rod, the second disc abut to a second side of the form-board opposite the first side; and
a third disc attached the second end of the central rod, the first disc, the second disc, and the third disc each comprising:
four slots radiating out from a central hub, the slots configured to receive a wire-tie;
a contoured central hub configured to receive a rebar rod; and
an attachment device within the central hub.

16. The system of claim 15 , wherein the central rod is an all-thread rod.

17. The system of claim 15 , wherein the central rod comprises metal.

18. The system of claim 15 , wherein the first disc, the second disc, and the third disc all comprise a fiber-reinforced plastic.

19. The system of claim 15 , further comprising:
a fourth disc identical to the first, second, and third discs, the fourth disc receiving a rebar rod opposite the third disc;
a second rod attached at a first end to the fourth disc; and
a fifth disc identical to the first, second, third, and fourth disc, the fifth disc configured to receive a second rebar rod.

Assignees

• Saudi Arabian Oil Co

Inventors

• Thompson Scott Burnett

Classifications

• E04C5/206 Primary

  Spacers having means to adapt the spacing distance · CPC title

• E04C5/168

  Spacers connecting parts for reinforcements and spacing the reinforcements from the form · CPC title

• E04G17/02 Primary

  Connecting or fastening means for non-metallic forming or stiffening elements {(E04G17/001 takes precedence)} · CPC title