Slab lifting and leveling system and method
OwnerCharles L. Asplininventor
Life of this patent
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Abstract
Systems and methods for raising a slab, such as a concrete slab, that has sunken and needs to be raised. In one injection, dried sand is carried in a stream of pressurized air and injected underneath the slab. The pressurized air raises the slab, and the dried sand is dispersed over a broad area and great distance underneath the slab to fill voids underneath the slab. Water is then injected underneath the slab for a predetermined period of time to wet the injected dried sand which stabilizes the injected sand and seals the injected sand to minimize or prevent air from passing through the injected sand. After the water injection, additional dried sand and pressurized air is injected underneath the slab to continue the slab lifting and filling of the void(s) underneath the slab.
Claims12
A slab lifting and leveling method, comprising:
- in a first injection, injecting dried sand and pressurized air at a first pressure underneath the slab;
- after the first injection, performing a second injection that includes injecting water along with air at a second pressure greater than the first pressure underneath the slab for a predetermined period of time;
- and
- at the end of the predetermined period of time, stopping the water injection and performing a third injection that includes injecting additional dried sand and pressurized air at the first pressure underneath the slab.
A concrete slab lifting and leveling method, comprising:
- in a first injection, injecting dried sand and pressurized air at a first pressure underneath the concrete slab;
- wetting the dried sand that has been injected underneath the concrete slab in the first injection by injecting water along with air at a second pressure greater than the first pressure underneath the concrete slab for a predetermined period of time;
- and
- at the end of the predetermined period of time, stopping the water injection and performing a second injection that includes injecting additional dried sand and pressurized air at the first pressure underneath the concrete slab.
A slab lifting and leveling system, comprising:
- an injection manifold having an injection outlet port, a first inlet port and a second inlet port, the injection outlet port is fluidly connected to the first inlet port and to the second inlet port;
- a source of dried sand and pressurized air fluidly connected to the first inlet port that supplies dried sand and pressurized air to the first inlet port;
- a first valve that is located to control the flow of the dried sand and the pressurized air from the source of dried sand and pressurized air to the first inlet port;
- a source of water fluidly connected to the second inlet port that supplies water to the second inlet port;
- a second valve that is located to control the flow of the water from the source of water to the second inlet port;
- and
- a source of pressurized air fluidly connected to the second inlet port that supplies pressurized air to the second inlet port.
Dependencies are inferred from the claim text.