Waterproof elevator pit floor and method of installing same

1. An elevator pit having a waterproof cement floor, the elevator pit comprising:

at least one sidewall defining an enclosed space that is sufficient to house an elevator car, and a cement floor extending transversely across an entirety of the enclosed space, the cement floor having a thickness of at least twelve inches;

an elevator assembly extending through the cement floor and which is configured and arranged to raise and lower the elevator car, the cement floor having an upper portion and a lower portion, wherein the lower portion is exposed by excavation of an entirety of the upper portion of the cement floor;

a drainage pit provided in the cement floor;

a gutter sleeve installed against and circumscribing a lower interior surface of the at least one sidewall and over a periphery of the lower portion of the cement floor;

a trench formed in the lower portion of the cement floor and defining a channel having a first end positioned at an area that is susceptible to liquid accumulation within the elevator pit and a second end terminating at the drainage pit, the channel having a depth that is less than a thickness of the lower portion of the cement floor;

a perforated conduit extending within the channel, wherein an end of the perforated conduit terminates at the drainage pit;

a layer of gravel disposed in the channel at a predetermined height to cover the perforated conduit; and

a layer of waterproof cement provided at a predetermined height over an entirety of the lower portion of the cement floor and against the gutter sleeve to cover a lower portion of the gutter sleeve, the gravel, the channel and the perforated conduit to form the waterproof cement floor of the elevator pit.

2. The elevator pit of claim 1 , wherein the perforated conduit is pitched downward at a predetermined angle towards the drainage pit.

3. The elevator pit of claim 1 , wherein a portion of the gutter sleeve extends above the waterproof cement floor.

4. The elevator pit of claim 1 , wherein the perforated conduit comprises PVC piping.

5. The elevator pit of claim 1 , wherein the gravel has a granularity in a range of approximately ½ to ¾ inches.

6. A method of waterproofing an elevator pit having at least one sidewall forming an enclosed space sufficient to house an elevator car, a cement floor extending transversely across an entirety of the enclosed space and through which an elevator assembly is installed and a drainage pit is provided, wherein the elevator assembly is configured and arranged to raise and lower the elevator car, and wherein the cement floor of the elevator pit has a thickness of at least twelve inches, the method comprising:

excavating an entirety of an upper portion of the cement floor to expose a lower interior surface of the at least one sidewall and a remaining portion of the cement floor which extends across the entirety of the enclosed space;

installing a gutter sleeve against the lower interior surface of the at least one sidewall and over a periphery of the remaining portion of the cement floor; and

pouring a layer of waterproof cement at a predetermined height over the entirety of the remaining portion of the cement floor and against the gutter sleeve to cover a lower portion of the gutter sleeve to form a waterproof cement floor covering in the elevator pit.

7. The method of claim 6 , wherein the step of pouring the layer of waterproof cement comprises pouring the waterproof cement to a predetermined height that is less than a maximum vertical height of the gutter sleeve.

8. The method of claim 6 , wherein the step of excavating an entirety of an upper portion of the cement floor includes removing a depth of three to four inches across the entire upper portion of the cement floor of the elevator pit.

9. The method of claim 6 , wherein the step of pouring the waterproof cement includes pouring a layer of waterproof cement of approximately 2 to 4 inches over the remaining portion of the cement floor.

10. A method of waterproofing an elevator pit having at least one sidewall forming an enclosed space sufficient to house an elevator car, a cement floor having a thickness of at least twelve inches and extending transversely across an entirety of the enclosed space formed by the at least one sidewall and through which an elevator assembly is installed and a drainage pit is provided, wherein the elevator assembly is configured and arranged to raise and lower the elevator car, and wherein the cement floor has been subjected to or is susceptible to damage from unintended fluid leakage, the method comprising:

excavating an entire upper portion of the cement floor to expose a lower interior surface of the at least one sidewall and a remaining portion of the cement floor which extends across the entirety of the enclosed space;

installing a gutter sleeve against an entire lower interior surface of the at least one sidewall and over a periphery of the remaining portion of the cement floor;

trenching a channel in the remaining portion of the cement floor, the channel having a depth that is less than a thickness of the remaining portion of the cement floor and a first end positioned at an area susceptible to liquid accumulation within the elevator pit and a second end terminating at the drainage pit;

inserting a perforated conduit within the channel such that an end of the perforated conduit terminates at the drainage pit;

applying a layer of gravel within the channel at a predetermined height to cover the perforated conduit; and

pouring a layer of waterproof cement at a predetermined height over an entirety of the remaining portion of the cement floor and against the gutter sleeve to cover a lower portion of the gutter sleeve, the channel, the gravel, and the perforated conduit to form a waterproof cement floor covering in the elevator pit.

11. The method of claim 10 , wherein the step of inserting the perforated conduit comprises pitching the perforated conduit downward at a predetermined angle towards the drainage pit.

12. The method of claim 10 , wherein the step of inserting the perforated conduit includes installing a conduit having perforations that are in a range of ⅜ to ⅝ inches.

13. The method of claim 10 , wherein the step of inserting the perforated conduit includes installing a conduit having a quantity of perforations in a range of 6 to 12 perforations per foot.

14. The method of claim 10 , wherein the step of applying a layer of gravel includes laying gravel having a granularity in a range of ½ to ¾ inches.

15. The method of claim 10 , wherein the step of applying the layer of gravel includes laying at least one of pebbles and bluestone chips over the channel and conduit.

16. The method of claim 10 , wherein the step of pouring the waterproof cement includes pouring a layer of waterproof cement of approximately 2 to 4 inches over the remaining portion of the cement floor.

17. The method of claim 10 , wherein the step of excavating an entire upper portion of the cement floor comprises removing a depth of three to four inches across the entire upper portion of the cement floor of the elevator pit.

18. The method of claim 10 , wherein the step of pouring the layer of waterproof cement comprises pouring the waterproof cement to a predetermined height that is less than a maximum vertical height of the gutter sleeve.

19. The method of claim 10 , wherein the step of pouring the layer of waterproof cement comprises leveling the layer of poured waterproof cement.

20. The method of claim 10 , wherein the step of pouring the layer of waterproof cement comprises pitching the layer of poured waterproof cement towards the drainage pit.