Method of installing manhole safety steps and plugs therefor
OwnerAnthony Foscarini, John Foscarini +1inventors
InventorsAnthony Foscarini, John Foscarini, Corrado Comello
Life of this patent
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Abstract
An improved method of manufacturing a concrete manhole casing and plugs for use therein. The method comprises fabricating a form for the manhole and securing a plurality of retractable arbors on the inside thereof. The arbors are extended through the form and a sealed plug is inserted on the end of each arbor. The concrete is poured into the form; vibrated and compacted. The arbors are withdrawn leaving the sealed plugs in place. The plugs carry a threading on their periphery and a novel locking structure on the inside surface.
Claims12
A method of manufacturing a concrete manhole casing comprising:
- (a) fabricating a form of a predetermined shape;
- (b) securing a plurality of retractable arbors on the inside surface of said form, each arbor located on the surface of said form at a predetermined location;
- (c) extending each arbor through said form;
- (d) placing a plug on the end of each arbor;
- (e) pouring concrete into said form;
- (f) vibrating and compacting said poured concrete;
- (g) retracting said arbors leaving said plugs in said compacted concrete;
- and
- (h) removing said form and arbors.
A method of constructing a manhole comprising:
- (a) prefabricating a manhole casing, said prefabrication comprising the steps of:
- (i) fabricating a form of a predetermined shape;
- (ii) securing a plurality of retractable arbors on the inside surface of said form, each arbor located on the surface of said form at a predetermined location;
- (iii) extending each arbor through said form;
- (iv) placing a sealed plug on the end of each arbor;
- (v) pouring concrete into said form;
- (vi) vibrating and compacting said poured concrete;
- (vii) retracting said arbors leaving said sealed plugs in said compacted concrete;
- and
- (viii) removing said form and arbors;
- (b) transporting said prefabricated casing to a job site;
- (c) inserting said casing into the ground at a predetermined position;
- and
- (d) back filling earth around said casing to secure said manhole casing in the ground.
A method of manufacturing a concrete manhole casing comprising:
- (a) fabricating a form of a predetermined shape;
- (b) securing a plurality of retractable arbors on the inside surface of said form, each arbor located on the surface of said form at a predetermined location;
- (c) extending each arbor through said form;
- (d) placing a plug on the end of each arbor, said plug comprising an elongated body of yieldable plastic having a conical tip and a hollowed interior with a locking means on the interior surface of said plug;
- (e) pouring concrete into said form;
- (f) vibrating and compacting said poured concrete;
- (g) retracting said arbors leaving said plugs in said compacted concrete;
- and
- (h) removing said form and arbors.
A method of manufacturing a concrete manhole casing comprising:
- (a) fabricating a form of a predetermined shape;
- (b) securing a plurality of retractable arbors on the inside surface of said form, each arbor located on the surface of said form at a predetermined location;
- (c) extending said arbor through said form;
- (d) placing a sealed plug on the end of each arbor, said plug comprising an elongated body of yieldable plastic having a conical tip and a hollowed interior with a locking means on the interior surface of said plug, said locking means including a ridge having a lock surface and a lead surface;
- (e) pouring concrete into said form;
- (f) vibrating and compacting said poured concrete;
- (g) retracting said arbors leaving said plugs in said compacted concrete;
- and
- (h) removing said form and arbors.
Dependencies are inferred from the claim text.