A variable assembly PC member includes: a plurality of hollow PC modules, each of which has an upper flange and a lower flange spaced apart from each other, and a pair of webs connecting both ends of the upper flange and the lower flange to form a hollow therein; and connectors connecting the plurality of hollow PC modules with each other in the width direction.

The invention relates to a lightweight concrete building structure using pre-stressed lightweight structural beams 46 with a lightweight floor panel (48) spanning between beams (46). In a particular arrangement, the parking system using building structure (10) may be about less than half the weight than traditional parking building structures. In accordance with one arrangement of the particular embodiment of the invention, the building structure comprises floor structures having one or more structural beams, and one of more lightweight panels for attachment to the structural beam, wherein the floor structure is defined by joining together the one or more lightweight structural beams and the one of more lightweight panels. This particular arrangement is particularly useful because it permits defining a floor structure capable of sustaining relative large loads (such as a multitude of vehicles) using lightweight floor panels.

A method and an arrangement for supporting a first floor element at a beam and a beam. The beam is provided with a supporting flange section configured to support the first floor element. The method includes supporting the first floor element on the supporting flange section so that a first space is formed between the first floor element and the beam, providing elongated transverse fittings in the beam, providing transverse reinforcements to extend between the beam and the first floor element. The elongated transverse fitting have a first free end at the first lateral side of the beam, and a first protective element is connected to the first free end of the elongated transverse fitting outside the web section of the beam.

Constructive system comprising at least four modular elongated prefabricated floor elements, each floor element defining a longitudinal axis parallel to its long side and a transversal axis parallel to its short side, and being arranged coplanar in a 2×2 matrix configuration such that each floor element is adjacent to another element by one of its long sides and adjacent to another of the elements by one of its short sides, the ends of the short sides of the floor elements resting on linear supporting elements, the floor elements comprising in the vertical face of each of the long sides a longitudinal groove having the direction of the longitudinal axis such that a cavity is formed between each pair of adjacent floor elements, the cavities being filled with a grouting, the system including at least one duct extending continuously along the two cavities and a post-tensioned tendon within the duct.

The invention provides a prefabricated structural element including an elongate body (11) and at least one first tensioner (1) that is fastened in the elongate body in such a manner that it compresses the elongate body. The structural element includes at least one second tensioner (2) that is fastened to the elongate body at two distinct points by two fastener element so that it compresses the elongate body, at least one of the fastener element being removable so as to make it possible to relax the compression exerted on the elongate body by the second tensioner.

This invention concerns a method of doing business which is combined with several scientific advancements of technological ingenuity that results in a novel way of doing business. It in fact teaches a “business method” which creates an innovative approach to obtain annual multi-billion dollar financial revenue as monthly rental income; which results from a rather large scale residential development community of 2000 dwelling units per 50 acre parcels; each parcel being developed upon heretofore 10,000 separately abandoned “Municipal Solid Waste” MSW landfill sites throughout the United States. These apartments are exclusively geared as rentals of a 1,020 square foot-two-bedroom apartment dwellings for only Covid-19 “First Responders” and military service personnel, for the unprecedented sum of just $800/month rent. Additionally, as a supplemental “business method” approach, this instant business model also teaches how to solve the nation's Municipal Solid Waste MSW disposal problems forever into the future as an ingenious viable solution into perpetuity. Moreover, it is further postulated within this business model that further collateral financial revenue automatically inures as a natural business consequence of the sheer necessary and vital purchase of construction materials needed herein, thus positioned as a leveraged-buyout; whereby this 76 billion dollar opportunity now becomes an integral adjunct to this unique business model by adopting a “Home Depot” type retail business concept structure as additional revenue sharing for this inventor's shareholders.

An integrally assembled hidden beam hollow two-way floor system includes precast slabs (1), honeycomb steel beams (3), and cast-in-place concrete (4). A plurality of compartments (12) arranged in a matrix is integrally provided on one surface of each of the precast slabs (1), and connecting grooves (14) are provided at a periphery of another surface of the precast slab (1) is provided with connecting grooves (14). Prepared bolt holes (13) penetrating through the precast slab (1) are provided in the connecting grooves (14). The honeycomb steel beam (3) serves as a primary beam or a secondary beam of a steel structure of the floor system. A surface of the precast slab (1) provided with no compartments is lapped and fixed between the secondary beams or between the primary beam and the secondary beam, and adjacent precast slabs (1) are connected and fixed by a U-shaped hoop (2) passing through the prepared bolt hole (13) to form a seam. The cast-in-place concrete (4) includes a surface layer cast onto the compartments (12) and a cast-in-place concrete ribs (41) cast between the compartments (12) of adjacent precast slabs (1) and between the compartment (12) and the primary beam and the secondary beam, the surface layer and the cast-in-place concrete ribs (41) being integrated. An assembly method for the integrally assembled hidden beam hollow two-way floor system is further provided. A method for assembling an integrally assembled hidden beam hollow two-way floor system is provided. The floor system and method for assembling the same achieve similar force performances in two directions, reliable connection between the floor slab and peripheral members, elimination of a risk of cracking of slab seams, and improved assembly efficiency.

An ultra high performance concrete (UHPC) voided slab panel may include a top slab including a top skin and a bottom slab including a bottom skin. The top slab and the bottom slab may be joined at a joint filled with a joint material and positioned a select height within the UHPC voided slab panel. The top slab and the bottom slab may be joined via a connector assembly. The panel may include least two ribs defining at least one void accessible via at least one opening through an exterior surface of the UHPC voided slab panel. The UHPC voided slab panel may be fabricated from UHPC and a plurality of embedded prestressing strands, and may be configured to meet select strength requirements that are greater than select strength requirements for conventional precast concrete without reinforcing bars being embedded within the UHPC voided slab panel.

A voided floor panel is provided. The voided floor panel includes a pre-cast dome, strands, reinforcing bars, and a slab. The pre-cast dome includes a flange portion, stem portions, and joint portions. The strands are pre-tensioned. The reinforcing bars are inserted through rebar block-outs of the pre-cast dome. The joint portions, the strands, and the reinforcing bars are cast within the slab. The strands improve a resistance of the slab to flexure. The joint portions improve a vertical shear resistance between the slab and the pre-cast dome. The joint portions may include corrugated dovetails for further improving a horizontal shear resistance between the slab and the pre-cast dome.

A hollow core element forming system including a measuring device configured to determine a location of a welding plate assembly on a casting bed. The welding plate assembly being connected to one or more prestressed strands. A hollow core forming mechanism has a strand guide located at a leading end of a support frame of the hollow core forming mechanism. The strand guide is configured to engage the one or more prestressed strands when the strand guide is in a closed position and to disengage the one or more prestressed strands when the strand guide is in an open position without interference between the strand guide and the welding plate assembly. A strand guide controller unit causes the strand guide to rotate between the open position and the closed position based on the location of the strand guide relative to the welding plate assembly.