A modular stair system comprises a plurality of modular stair units. Each of the plurality of modular stair units are associated with a single story of a construction. An upper, rectangular landing comprises a pair of long members connected at each end to a pair of short members. A mid-level, rectangular landing comprises a first pair of members and a second pair of members interconnected at their ends. A first and second plurality of corner brackets interconnects an end of the members with an end of the members of the upper and mid-level landings. The first and second plurality of corner brackets have the variable size depending on the number of the plurality of modular stair units to be stacked in the stairwell. A plurality of corner support columns support the upper, rectangular landing at a top portion thereof and the mid-level, rectangular landing at a mid-portion thereof and removably connected to the upper, rectangular landing and the mid-level, rectangular landing. The plurality of corner support columns have a second variable size depending on the number of the plurality of modular stair units to be stacked in the stairwell. A first stair runner removably connects to the mid-level landing and connects a bottom level to the mid-level landing. A second stair runner removably connects to the mid-level, rectangular landing and the upper, rectangular landing to connect the mid-level, rectangular landing to the upper, rectangular landing. Each of the plurality of modular stair units are organized such that a bottom modular stair unit is placed on a foundation and each successive modular stair unit of the plurality of modular stair units are stacked on top of and connected to a lower modular stair unit.

An interconnected heated patio stone and system are disclosed, the stone consisting of a durable, heat-transmitting upper layer, and an insulating lower layer, a heating cable running within the stone, and having two interconnections at the edge of the stone. The interconnection has a bracket to connect with the cable, a receptacle for joining electrically to a bridging connector, and an electrical linkage making an electrical connection available. Each stone is connected with another by a bridging connector, which contains an articulated wire, and has a basin and cap at each end for electrically joining, in a sealed manner, with the receptacle. The system consists of two or more stones interconnected using bridging connectors, the whole system also connected to a power source.

A pre-cast concrete stair tread is provided where the stair tread has reinforced corrugated metal embedded within the core of the concrete stair tread. The corrugations are lined up along the elongated direction of the stair tread. Concrete is poured and cured over at least one side of the corrugated metal. Additionally, the pre-cast concrete stair tread may have one or more metal straps fixed on the reinforced corrugated metal in a direction perpendicular to the corrugations and the elongated direction.

A pre-cast concrete stair tread is provided where the stair tread has reinforced corrugated metal embedded within the core of the concrete stair tread. The corrugations are lined up along the elongated direction of the stair tread. Concrete is poured and cured over at least one side of the corrugated metal. Additionally, the pre-cast concrete stair tread may have one or more metal straps fixed on the reinforced corrugated metal in a direction perpendicular to the corrugations and the elongated direction.

Provided relates to a precast-concrete stairway room construction method for constructing a stairway room with one coupling operation by manufacturing the stairway room to have a structure formed by vertically dividing the stairway room into left and right sides, wherein the construction method comprises: a mold preparing step (S10); a rebar arranging step (S20); a concrete placing and curing step (S30); a divided structure manufacturing step (S40); a structure attaching step (S50); and a structure bonding step (S60).

A precast concrete step unit formed of left and right sidewalls, risers, and treads, wherein left and right sidewalls are assembled from a plurality of pre-cast sidewall panel modules, with a stepped panel module with two or more steps. Pre-cast concrete riser modules and tread modules extend between the right and left sidewalls. Reinforcing cross brace members are fastened to the inside distal surfaces of the left and right sidewalls where they are bolted into screw anchors embedded into the sidewalls. There are also screw anchor inserts embedded into the proximal ends of the sidewalls and into the ends of a first or lowest of the risers, and adapted for affixing the riser and sidewalls using clip angles or right-angle brackets. After alignment, the treads and remaining risers are installed using a construction adhesive which may be applied using a caulk gun. The precast modules each weight about 200 pounds or less, with none exceeding 250 pounds, and most much less. The installation can be carried out by an installation team of two workmen. One-piece concrete footing pieces can be used to support the lower edges of the sidewall panel modules.

A precast concrete step unit formed of left and right sidewalls, risers, and treads, wherein left and right sidewalls are assembled from a plurality of pre-cast sidewall panel modules, with a stepped panel module with two or more steps. Pre-cast concrete riser modules and tread modules extend between the right and left sidewalls. Reinforcing cross brace members are fastened to the inside distal surfaces of the left and right sidewalls where they are bolted into screw anchors embedded into the sidewalls. There are also screw anchor inserts embedded into the proximal ends of the sidewalls and into the ends of a first or lowest of the risers, and adapted for affixing the riser and sidewalls using clip angles or right-angle brackets. After alignment, the treads and remaining risers are installed using a construction adhesive which may be applied using a caulk gun. The precast modules each weight about 200 pounds or less, with none exceeding 250 pounds, and most much less. The installation can be carried out by an installation team of two workmen. One-piece concrete footing pieces can be used to support the lower edges of the sidewall panel modules.

A precast concrete step unit formed of left and right sidewalls, risers, and treads, wherein left and right sidewalls are assembled from a plurality of pre-cast sidewall panel modules, including at least one stepped panel module and at least one rectangular panel module. The panel modules are joined edge-to-edge at seams, with cement and/or with hardware. Pre-cast concrete tread modules extend at least between the left and right sidewalls and are mounted onto respective stepped edge surfaces of the right and left sidewalls. Pre-cast concrete riser modules also extending at least between the right and left sidewalls and mounted onto tread modules. These each extend vertically to successive stepped edge surfaces. Reinforcing cross brace members are fastened to the inward surfaces of the left and right sidewalls and extend at crossed diagonals between them. The precast modules each weight about 200 pounds or less and can be carried by two workmen. One-piece concrete footing pieces can be used to support the lower edges of the sidewall panel modules.

A precast concrete step unit formed of left and right sidewalls, risers, and treads, wherein left and right sidewalls are assembled from a plurality of pre-cast sidewall panel modules, including at least one stepped panel module and at least one rectangular panel module. The panel modules are joined edge-to-edge at seams, with cement and/or with hardware. Pre-cast concrete tread modules extend at least between the left and right sidewalls and are mounted onto respective stepped edge surfaces of the right and left sidewalls. Pre-cast concrete riser modules also extending at least between the right and left sidewalls and mounted onto tread modules. These each extend vertically to successive stepped edge surfaces. Reinforcing cross brace members are fastened to the inward surfaces of the left and right sidewalls and extend at crossed diagonals between them. The precast modules each weight about 200 pounds or less and can be carried by two workmen. One-piece concrete footing pieces can be used to support the lower edges of the sidewall panel modules.

A stair tread and method of building a stairway is provided. Each stair tread includes a metal pan having one or more walls forming a cavity. Concrete filler is disposed in the cavity to provide an upper walking surface. Reinforcement bars and foam blocks can be positioned within the cavity. Concrete treads including the pan can then be transported to a job site for attachment between a pair of stringers.