Post-tension concrete leave out splicing system and method
Devices, systems, and methods for constructing post-tensioned concrete slabs in a new floor construction that has a reduced gap distance between the slabs. The devices, systems, and methods can improve project construction time by reducing the time delay in accessing the floor underneath the slabs due to safety and/or weather conditions.
1. A concrete construction, comprising: a first post-tensioned concrete slab and a second post-tensioned concrete slab, 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 first rebar installed therein, said first post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said first rebar, said second post-tensioned concrete slab including a second rebar installed therein, said second post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said second rebar, said first post-tensioned concrete slab and 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 construction further including a splice device positioned in the gap for connecting to a portion of the first rebar and to a portion of the second rebar.
2. The concrete construction according to claim 1 , wherein said splice device includes a cavity that contains said portion of the second rebar.
3. The concrete construction according to claim 2 , wherein said cavity also contains said portion of the first rebar.
4. The concrete construction according to claim 1 , wherein said splice device is attached to said portion of the first rebar.
5. The concrete construction according to claim 1 , wherein said splice device is connected to said end portion of the first rebar at an end of said splice device, wherein said end has a threaded surface which mates with a threaded surface of said end portion of the first rebar.
6. The concrete construction according to claim 1 , wherein said splice device is connected to said first rebar by a weld.
7. The concrete construction according to claim 6 , wherein said splice device is connected to said second rebar by a weld.
8. The concrete 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, said shorter dimension being shorter relative to said longer dimension.
9. The concrete 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 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 slabs, and
the strip of non-shrink material completely surrounds the splice device.
11. A concrete construction, comprising: a first post-tensioned concrete slab and a second post-tensioned concrete slab, 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 first rebar installed therein, said first post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said first rebar, said second post-tensioned concrete slab including a second rebar installed therein, said second post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said second rebar, said first post-tensioned concrete slab and 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 construction further including:
a splice device positioned in the gap connecting an end portion of the first rebar and an end portion of the second rebar; and
a strip of non-shrink material being in the gap and completely surrounding said splice device, 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 slabs, said strip having 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.
12. A method for making a concrete construction including a first post-tensioned concrete slab and a second post-tensioned concrete slab separated by a gap, comprising:
forming said first post-tensioned concrete slab, wherein said first post-tensioned concrete slab includes a first rebar installed therein, said first post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said first rebar;
prior to pouring a second concrete slab, positioning a second rebar for said second concrete slab so that a portion of said second rebar is generally in line with a portion of said first rebar;
pouring said second concrete slab;
forming a second post-tensioned concrete slab by tensioning said second concrete slab in at least a direction substantially parallel to said second rebar, thus forming said gap between said first post-tensioned concrete slab and said second post-tensioned concrete 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;
after forming said second post-tensioned concrete slab, positioning a splice device to contact both a portion of said first rebar and a portion of said second rebar; and
securely connecting the splice device to said portion of said first rebar and said portion of said second rebar.
13. The method according to claim 12 , wherein said shorter dimension being twelve (12) inches or less in length.
14. A method for making a concrete construction including a first post-tensioned concrete slab and a second post-tensioned concrete slab, comprising:
forming said first post-tensioned concrete slab, wherein said first post-tensioned concrete slab includes a first rebar installed therein, said first post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said first rebar;
before a second post-tensioned concrete slab has been formed, positioning a splice device at an end portion of the first rebar, but not securely connecting said splice device to the end portion of the first rebar;
before the second post-tensioned concrete slab has been formed, positioning an end portion of a second rebar inside a chamber of said splice device, but not securely connecting said splice device to the end portion of the second rebar;
forming said second post-tensioned concrete slab so that said second rebar is installed therein, said second post-tensioned concrete slab being post-tensioned in at least a direction substantially parallel to said second rebar, wherein said first post-tensioned concrete slab and second post-tensioned concrete slab are 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, and said end portion of said second rebar is allowed to move with respect to the splice device during the creating of said second post-tensioned concrete slab; and
securely connecting said splice device to said end portion of said first rebar and said end portion of said second rebar.
15. The method according to claim 14 , wherein said gap is formed so that 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, said shorter dimension being shorter relative to said longer dimension.
16. 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 slabs.