Post-tension concrete leave out splicing system and method

1. A concrete floor construction, comprising:

a first post-tensioned concrete floor slab, a second post-tensioned concrete floor slab, and a cavity-forming device, said first post-tensioned concrete floor slab and said second post-tensioned concrete floor slab having respective upper surfaces that are generally aligned,

said first post-tensioned concrete floor slab including a plurality of first rebars installed therein, said first post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said plurality of first rebars,

said second post-tensioned concrete floor slab including a plurality of second rebars installed therein, said second post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said plurality of second rebars,

said first post-tensioned concrete floor slab and said second post-tensioned concrete floor slab being separated by a gap so that the concrete material of said first post-tensioned concrete floor slab is not in contact with the concrete material of said second post-tensioned concrete floor slab, and

said cavity-forming device forming a cavity, said cavity-forming device being installed in said first post-tensioned concrete floor slab, wherein said cavity contains a portion of one of said second rebars.

2. The concrete floor construction according to claim 1 , wherein said cavity-forming device has an end which is connected to an end portion of one of said first rebars, wherein said end has a threaded surface which mates with a threaded surface of said end portion of the one of said first rebars.

3. The concrete floor construction according to claim 1 , wherein a portion of one of said first rebars is also contained in said cavity.

4. The concrete floor construction according to claim 3 , wherein said cavity-forming device has a pair of tubes extending upwardly through said first post-tensioned concrete floor slab and providing air access from above said post-tensioned concrete floor slab to said cavity, said cavity being filled through one of said tubes with a binding material which connects together said one of said first rebars and said one of said second rebars so that the portion of said one of said first rebars and the portion of said one of said second rebars are substantially parallel with each other.

5. The concrete floor construction according to claim 3 , wherein said cavity-forming device has a pair of tubes extending upwardly through said first post-tensioned concrete floor slab and providing air access from above said post-tensioned concrete floor slab to said cavity, said cavity being filled with a binding material which connects together said one of said first rebars and said one of said second rebars so that the portion of said one of said first rebars and the portion of said one of said second rebars are substantially inline.

6. The concrete floor construction according to claim 1 , wherein said cavity-forming device has a pair of tubes extending upwardly through said first post-tensioned concrete floor slab and providing air access from above said post-tensioned concrete floor slab to said cavity, said cavity being filled through one of said tubes with a binding material which fixes said one of said second rebars in said cavity.

7. The concrete floor construction according to claim 1 , further comprising a second cavity foimed by a second cavity-forming device installed in said second post-tensioned concrete floor slab, wherein said second cavity contains a portion of one of said plurality of said first rebars.

8. The concrete floor construction according to claim 1 , wherein said gap has a longer dimension for one side-to-side and a shorter dimension for another side-to-side, said shorter dimension being three feet or less and being shorter relative to said longer dimension.

9. The concrete floor construction according to claim 1 , wherein said gap has a longer dimension for one side-to-side and a shorter dimension for another side-to-side, said shorter dimension being twelve (12) inches or less and being shorter relative to said longer dimension.

10. The concrete floor construction according to claim 1 , further comprising:

a strip of non-shrink material being in the gap, wherein said strip has a compressive strength that is greater than or equal to a compressive strength of the concrete material of said first and second post-tensioned concrete floor slabs.

11. A concrete construction, comprising:

a first post-tensioned concrete slab, a second post-tensioned concrete slab, and a cavity-forming device,

said first post-tensioned concrete slab and said second post-tensioned concrete slab having respective upper surfaces that are generally aligned,

said first post-tensioned concrete slab including a plurality of first rebars installed therein, said first post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said plurality of first rebars,

said second post-tensioned concrete slab including a plurality of second rebars installed therein, said second post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said plurality of second rebars,

said first post-tensioned concrete slab and said second post-tensioned concrete slab being separated by a gap so that the concrete material of said first post-tensioned concrete slab is not in contact with the concrete material of said second post-tensioned concrete slab,

said cavity-forming device forming a cavity,

said cavity-forming device being installed in said first post-tensioned concrete slab, wherein said cavity contains a portion of one of said plurality of second rebars, and

said cavity-forming device is not directly connected to said plurality of first rebars.

12. The concrete construction according to claim 11 , wherein said one of said first rebars and the portion of said one of said second rebars are substantially parallel with each other.

13. A concrete floor construction, comprising:

a first post-tensioned concrete floor slab, a second post-tensioned concrete floor slab, and a cavity-forming device, said first post-tensioned concrete floor slab and said second post-tensioned concrete floor slab having respective upper surfaces that are generally aligned,

said first post-tensioned concrete floor slab including a plurality of first rebars installed therein, said first post-tensioned concrete floor slab being post-tensioned in at least a direction substantially parallel to said plurality of first rebars,

said second post-tensioned concrete floor slab including a plurality of second rebars installed therein, said second post-tensioned concrete floor slab being post-tensioned in at least a direction substantially parallel to said plurality of second rebars,

said first post-tensioned concrete floor slab and said second post-tensioned concrete floor slab being separated by a gap so that the concrete material of said first post-tensioned concrete floor slab is not in contact with the concrete material of said second post-tensioned concrete floor slab,

said cavity-forming device forming a cavity which together with said device form a volume,

said cavity-forming device being installed in said first post-tensioned concrete floor slab, wherein one of said second rebars connects with said volume,

said cavity being filled with a binding material which connects together said first post-tensioned concrete floor slab and said one of said second rebars,

said gap having a longer dimension for one side-to-side and a shorter dimension for another side-to-side, said shorter dimension being twelve (12) inches or less and being shorter relative to said longer dimension, and

said gap being filled with a strip of non-shrink material, wherein said strip has a compressive strength that is greater than or equal to a compressive strength of the concrete material of said first and second post-tensioned concrete floor slabs.

14. A method for making a concrete floor construction including a first post-tensioned concrete floor slab and a second post-tensioned concrete floor slab separated by a gap, comprising:

forming said first post-tensioned concrete floor slab with a plurality of first rebars, said first post-tensioned concrete floor slab being post-tensioned in at least a direction substantially parallel to said plurality of first rebars, wherein said first post-tensioned concrete floor slab includes a cavity-forming device with a cavity having an opening towards an end of said first post-tensioned concrete floor slab;

prior to pouring a second concrete floor slab, positioning one of a plurality of second rebars for said second concrete floor slab so that a portion of said one of said plurality of second rebars is inside said cavity;

pouring said second concrete floor slab;

forming the second post-tensioned concrete floor slab by tensioning said second concrete floor slab in at least a direction substantially parallel to said plurality of second rebars, thus forming said gap between said first post-tensioned concrete floor slab and said second post-tensioned concrete floor slab, wherein said gap has a longer dimension for one side-to-side and a shorter dimension for another side-to-side, said shorter dimension being shorter relative to said longer dimension; and

after forming said second post-tensioned concrete floor slab, securely fixing said portion of said one of said plurality of said second rebars in the cavity.

15. The method according to claim 14 , in said step of securely fixing said portion of said second rebar in the cavity, also securely fixing a portion of said first rebar in the cavity.

16. The method according to claim 14 , wherein said shorter dimension being three feet or less in length.

17. The method according to claim 14 , further comprising:

forming a strip of material in said gap with a non-shrink material, wherein said strip has a compressive strength that is greater than or equal to a compressive strength of the concrete material of said first and second post-tensioned concrete floor slabs.

18. A method for making a concrete floor construction including a first post-tensioned concrete floor slab and a second post-tensioned concrete floor slab separated by a gap, comprising:

forming said first post-tensioned concrete floor slab, wherein said first post-tensioned concrete floor slab includes a first rebar installed therein, and an end portion of said first rebar extends into a space that will become said gap, said first post-tensioned concrete floor slab being post-tensioned in at least a direction substantially parallel to said first rebar;

before a second post-tensioned concrete floor slab has been formed, positioning a cavity-forming device having a cavity at an end portion of said first rebar so that said end portion of said first rebar is inside said cavity, but not securely connecting said cavity-forming device to said end portion of said first rebar;

pouring said second concrete floor slab such that the cavity forming device is positioned within an end of the second concrete floor slab;

forming a second post-tensioned concrete floor slab by tensioning said second concrete floor slab in at least a direction substantially parallel to a second rebar installed within the second concrete floor slab, thus forming said gap between said first post-tensioned concrete floor slab and said second post-tensioned concrete floor slab, wherein said gap has a longer dimension for one side-to-side and a shorter dimension for another side-to-side, said shorter dimension being shorter relative to said longer dimension; and

after forming said second post-tensioned concrete floor slab, securely fixing said end portion of said first rebar in the cavity.

19. The method according to claim 18 , wherein prior to forming said second post-tensioned concrete floor slab, positioning the second rebar inside said cavity but not securely connecting said cavity-forming device to said second rebar; and

in the securely fixing said portion of said first rebar in the cavity step, also securely fixing a portion of the second rebar of said second post-tensioned concrete floor slab in the cavity.

20. The method according to claim 19 , further comprising:

forming a strip of material in said gap with a non-shrink material, wherein said strip has a compressive strength that is greater than or equal to a compressive strength of the concrete material of said first and second post-tensioned concrete floor slabs.