Prefabricated modular flooring and roofing system

• US 3,918,222 A
• Filed: 06/03/1974
• Issued: 11/11/1975
• Est. Priority Date: 06/03/1974
• Status: Expired due to Term

• Current Assignee: Bahram Bahramian
• Original Assignee: Bahram Bahramian
• Inventors: Bahramian, Bahram
• Primary Examiner(s): Ridgill, Jr., James L.
• Application Number:
  US05/475,430
• Time in Patent Office: 526 Days
• Field of Search: 52/251,252,253,263,283,223,227-230,602,258,259,301,234,236,126,745 29/452
• US Class Current: 52/223.7
• CPC Class Codes: E04B 5/04 with beams or slabs of concrete or other stone-like material, e.g. asbestos cement E04B5/08, E04B5/14 take precedence
• CPC Class Codes: E04B 5/06 with beams placed against one another optionally with pointing-mortar
• CPC Class Codes: E04B 5/43 Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors anchoring devices for balconies with means for preventing cold bridging E04B1/0038; extraordinary constructions in general E04B1/34
• CPC Class Codes: Y10T 29/49874 Prestressing rod, filament or strand

Abstract

A plurality of elongated precast concrete beams or slabs are prestressed longitudinally and arranged in parallel relation to form a waffle-type floor structure. Each of the beams or slabs includes a plurality of longitudinally spaced and laterally extending integral walls through which reinforcing tubes define corresponding openings. The openings in each beam or slab align with corresponding openings in each adjacent beam or slab, and a cable extends through each series of aligned openings. Each cable is post-tensioned and is then attached by cement mortar to the corresponding tubes to provide a modular floor or roof structure which distributes loads generally uniform in all directions. In one embodiment, a series of T-shaped and/or L-shaped precast reinforced slab members may be positioned between each set of adjacent beams and are adapted to rest on bosses projecting outwardly from the opposing sides of the adjacent beams. The slab members have reinforcing tubes defining openings which align with the openings within the beams and which also receive the cables before they are tensioned and cemented to the tubes. In another embodiment, the slabs are supported by a framework of prestressed elongated beams, and the ends of each beam are supported by precast head members mounted on the top of upright columns. The laterally extending post-tensioned cables are attached to loops projecting upwardly from the adjacent beams, and a layer of topping concrete covers the loops and cables on each beam.

Claims

1. In a prefabricated modular flooring system for a building structure, including a first set of parallel spaced elongated precast concrete beams disposed perpendicular to a second set of parallel spaced elongated precast concrete beams and cooperating to form a frame defining a bay, means for supporting the adjacent ends of said beams at the corners of said frame, a plurality of rectangular precast concrete floor slabs disposed in parallel horizontal relation within said frame and having opposite end portions mounted on said firrst set of beams for supporting one portion of the floor load by said first set of beams, each of said floor slabs including a plurality of laterally spaced longitudinally extending walls projecting downwardly from an integrally connecting substantially flat horizontal upper wall, each of said floor slabs further including a plurality of longitudinally spaced and laterally extending transverse walls projecting downwardly from said upper wall and integrally connecting said upper and longitudinally extending walls to define a plurality of longitudinally and laterally spaced downwardly facing cavities providing the bottom of said floor slab with a waffle-type configuration, and a set of elongated reinforcing members extending longitudinally within each said floor slab through said longitudinally extending walls, the improvement comprising a set of longitudinally spaced tubes extending substantially horizontally through said transverse walls of each said floor slab, said tubes within one said floor slab being in substantial horizontal alignment with the corresponding said tubes within each horizontally adjacent said floor slab, and elongated flexible post-tension cable extending continuously through each set of horizontally aligned said tubes within said floor slabs, and means for securing said cables to said second set of beams and said floor slabs after said cables are tensioned to provide for supporting another portion of the floor load by said second sets of beams and thereby produce a two-way distribution of the floor load to both said first and second sets of beams.

2. A modular flooring system as defined in claim 1 including a series of longitudinally disposed slab members positioned between adjacent said slabs, and each said slab member has a generally T-shaped cross-sectional configuration in a direction parallel to said elongated slabs.

3. A modular flooring system as defined in claim 1 wherein said second set of said beams each have outwardly projecting and longitudinally extending bottom flanges and a top surface disposed below the top surfaces of said slabs, said cables extend adjacent the top surfaces of said second set of beams, and means including a layer of concrete on the top surface of said second set of beams for securing said cables to said second set of beams.

4. In a method of constructing a prefabricated modular flooring system for a building structure, including the steps of positioning a first set of parallel spaced elongated precast concrete beams perpendicular to a second set of parallel spaced elongated precast concrete beams to form a horizontal frame defining a bay, supporting the adjacent ends of said beams at the corners of said frame, positioning a plurality of rectangular precast concrete floor slabs in parallel horizontal relation within said frame with opposite end portions of said slabs mounted on said first set of beams for supporting a portion of the floor load by said first set of beams, forming each of said floor slabs with a plurality of laterally spaced longitudinally extending walls projecting downwardly from an integrally connecting substantially flat horizontal upper wall, forming each of said floor slabs with a plurality of longitudinally spaced and laterally extending transverse walls projecting downwardly from said upper wall and integrally connecting said upper and longitudinally extending walls to define a plurality of longitudinally and laterally spaced downwardly facing cavities providing the bottom of said floor slab with a waffle-type configuration, and extending a set of elongated reinforcing members longitudinally within each said floor slab through said longitudinally extending walls, the improvement comprising the steps of extending a set of longitudinally spaced tubes substantially horizontally through said transverse walls of each said floor slab, locating said tubes within each floor slab in substantial horizontal alignment with the corresponding said tubes witHin each horizontally adjacent said floor slab, extending an elongated flexible post-tension cable continuously through each set of horizontally aligned said tubes within said floor slabs, and securing said cables to said second set of beams and said floor slabs after said cables are tensioned to provide for supporting another portion of the floor load by said second sets of beams and thereby produce a two-way distribution of the floor load to both said first and second sets of beams.