A system for releasably securing a platform in a raised position is disclosed. A track is provided. An arm is connected at a first end to the platform. A second end, with a lug, is biased toward a side portion of the track. The lug is configured to ride in the track. As the platform is raised, the lug rides upward and enters the top portion and clears a first vertical wall, whereupon the lug rests in the depression and thus supports the platform in the raised position. As the platform is raised further, the lug clears a second vertical wall, whereupon the lug can ride downward in the side portion and through a bottom portion, past a door and out an open end of the bottom portion.

The invention relates to a scaffolding crossbar (22a, 22b) having at least two, in particular at least three crossbar coupling elements at one end. The crossbar coupling elements can be designed to be the same. The crossbar coupling elements are designed preferably in the form of receiving openings. The crossbar coupling elements serve to detachably secure diagonal piece coupling elements. The scaffolding (10) according to the invention, having a scaffolding crossbar (22a, 22b) of this type, has a diagonal scaffolding piece (16a, 16b) with a first diagonal piece coupling element at one end and a second diagonal piece coupling element at the other end. The first diagonal piece coupling element can be designed differently from the second diagonal piece coupling element, wherein the crossbar coupling elements are designed preferably for connecting both diagonal piece coupling elements. The scaffolding (10) can thereby be designed such that it is optionally partially or completely particularly torsion resistant.

Diagonal reinforcement for floor formwork support structures, the support structure comprising height-adjustable props on which diagonal reinforcements are mounted, wherein each of the diagonal reinforcements comprises a projecting pivot close to the upper end thereof, or on the upper end itself, the free end of which pivot is deformed towards one side and can fit progressively into one of the holes in the prop on which the pivot is mounted by means of rotation, it being possible to detach the reinforcement simply by reproducing the insertion movement in reverse.

A method of constructing a structure in which an item is to be installed at an elevated height on the structure. Hoists are hung from the structure. A platform is moved from ground level and positioned at a first elevated position between ground level and the hoists. The platform is attached to the hoists at the first elevated position. After the platform has been attached to the hoists, the item is moved onto the platform. The item is lifted on the platform to a second elevated position for installation at the elevated height on the structure and the item is installed at the elevated height.

A scaffold system comprising a set of components adapted for assembly of a scaffold section. The components are at least two frame components, each having at least two vertical members separated by at least two interconnecting members, the at least two vertical members comprising a socket; two or more brace components adapted to span between and connect to the two side frame components; at least four corner pole components, each adapted to connect with the socket of a vertical member; and a plurality of support rail components adapted to span between two pole components.

One embodiment of the invention is a horizontal scaffold truss that has upper and lower horizontal scaffold members offset but fixedly joined with braces. Each upper and lower members have a connector positioned on each end of the respective lower and upper members, where at least one of the connectors is pivotally mounted on the respective lower or upper connector, and the connecters are engageable with an annular member positioned on a vertical scaffold member.

A building assembly system for fabricating a multi-story building is described, wherein the building includes a vertical support core arranged on a base. Lift jacks are arranged between a top portion and a bottom portion of the vertical support core, and a reusable bridle is suspended from the plurality of lift jacks and slidably arranged on the vertical support core. A floor plate is assembled onto the bridle at an assembly level that is proximal to the base. The plurality of the lift jacks are operable to lift the bridle and the assembled floor plate to a design elevation on the vertical support core, and are operable to lower the bridle to the assembly level on the vertical support core after the floor plate has been secured to the vertical support core at the design elevation.

A connector for a modular scaffold, having a connector tube having a tube section with enlarged outer and/or inner diameter at least at one end, preferably at both ends, for connection to at least one vertical post, as well as a connector element which has at least one receiving recess for connection to at least one horizontal beam and/or a diagonal brace, wherein the connector element is fastened to the connector tube either indirectly via an extension arm or directly on the outer circumference.

A modular scaffold, a method of manufacturing a modular scaffold and a use of a connector within a modular scaffold.

A means for solving the problem is characterized in including: a frame body including a pair of longitudinal beams, a pair of lateral beams, and four coupling members disposed between respective end portions of the longitudinal beams and respective end portions of the lateral beams so as to rotatably connect the longitudinal beams and the lateral beams on the same plane, two or more intermediate beams bridged between the longitudinal beams at a predetermined interval; and scaffolding boards bridged between the longitudinal beams and supported by at least one of the intermediate beams, the number of the scaffolding boards being larger than the installing number of the intermediate beams by one.

A modular fall protection system has an adjustable frame that can be mounted onto an external structure and used to support the weight of a user who has fallen. The adjustable frame has a length-adjustable mast, set of connective braces, and an anchor point. The length-adjustable mast is a telescoping post that can be extended or collapsed to provide fall protection to the user at various heights. The connective braces extend between the length-adjustable mast and the external structure and are used to maintain the length-adjustable mast in an orientation that facilitates suspending the user in the air after a fall. The anchor point enables the user to be tethered to the length-adjustable post. Preferably, the system has a detachable walkway and handrail that can be mounted onto the adjustable frame and provide fall protection in a variety of situations.