A roofer support apparatus for providing a level support on a pitched roof includes a base mount with a plurality of adjustment apertures and a chain slot. A mount bottom side is positioned on a pitched roof. A support is pivotably coupled to the base mount and receives a board. A pivot bracket is coupled to the support and is selectively engageable with two of the plurality of adjustment apertures to fix the pivot bracket to the base mount with the support horizontal. A chain is coupled to the base mount and is selectively engageable with the chain slot of the mount front side. A chain anchor is coupled to the chain. The chain anchor is secured to an opposite roof side of the pitched roof.

A roofer support apparatus for providing a level support on a pitched roof includes a base mount with a plurality of adjustment apertures and a chain slot. A mount bottom side is positioned on a pitched roof. A support is pivotably coupled to the base mount and receives a board. A pivot bracket is coupled to the support and is selectively engageable with two of the plurality of adjustment apertures to fix the pivot bracket to the base mount with the support horizontal. A chain is coupled to the base mount and is selectively engageable with the chain slot of the mount front side. A chain anchor is coupled to the chain. The chain anchor is secured to an opposite roof side of the pitched roof.

A scaffolding to be fastened to a bridge or the like deck structure comprises a boom system (2) for supporting the working platforms and the support structures needed for the work and for fastening the boom system of the fastening body (1) to the upper surface of the deck structure. The boom system (2) is connected to the fastening body via a swivel quadrangle (3, 6, 11, 12).

The invention relates to a lift drive for a rail-guided cantilever construction device (2), in particular for use in bridge construction. The cantilever construction device (2) comprises a main frame (3, 3′) which is guided by at least one rail (4a, 4b, 4′a, 4′b) for receiving at least one formwork. The lift drive comprises a lift device (5, 5′), wherein a first end of the lift device (5, 5′) is designed to be connected to the main frame (3, 3′), and a second lift device (5, 5′) end opposite the first end can be moved relative to the main frame (3, 3′) when the first end of the lift device (5, 5′) is connected to the main frame (3, 3′); a first fixing device (6) which is connected to the first end of the lift device (5, 5′) and is designed to fix the first end of the lift device (5, 5′) with respect to the at least one rail (4a, 4b, 4′a, 4′b); and a second fixing device (7) which is connected to the second end of the lift device (5, 5′) and is designed to fix the second end of the lift device (5, 5′) with respect to the at least one rail (4a, 4b, 4′a, 4′b). The first and second fixing device (6, 7) can each be releasably fixed with respect to the at least one rail (4a, 4b, 4′a, 4′b) in a reversible manner.

The invention relates to a lift drive for a rail-guided cantilever construction device (2), in particular for use in bridge construction. The cantilever construction device (2) comprises a main frame (3, 3′) which is guided by at least one rail (4a, 4b, 4′a, 4′b) for receiving at least one formwork. The lift drive comprises a lift device (5, 5′), wherein a first end of the lift device (5, 5′) is designed to be connected to the main frame (3, 3′), and a second lift device (5, 5′) end opposite the first end can be moved relative to the main frame (3, 3′) when the first end of the lift device (5, 5′) is connected to the main frame (3, 3′); a first fixing device (6) which is connected to the first end of the lift device (5, 5′) and is designed to fix the first end of the lift device (5, 5′) with respect to the at least one rail (4a, 4b, 4′a, 4′b); and a second fixing device (7) which is connected to the second end of the lift device (5, 5′) and is designed to fix the second end of the lift device (5, 5′) with respect to the at least one rail (4a, 4b, 4′a, 4′b). The first and second fixing device (6, 7) can each be releasably fixed with respect to the at least one rail (4a, 4b, 4′a, 4′b) in a reversible manner.

A davit assembly comprises a vertical structural column connecting a horizontal structural beam between a longer forward beam portion and a shorter rearward beam portion thereof, an angled support brace tensioned between a lower region of the structural column and an end of the shorter rearward beam portion and a primary rigging anchor slidably engaging the forward beam portion.

A facade gantry allows for close inspection of a facade using remotely operated cameras, probes, and/or sampling devices. These devices are located in a housing that is positioned in front of a facade by a system of cables, from which it is suspended, that allow for movement in any direction in a plane. Two cables are attached to the housing containing the sensors and tools and are wound onto two separate spools located on the roof at the vertical boundaries of the inspection area. By winding and unwinding these spools, the housing can be raised, lowered, and moved from side to side. The invention further has an optional “shed” located on the ground that protects pedestrians in the case of a suspension system failure. The shed moves to maintain a position directly under the housing. The gantry optionally allows for repair of the facade by using remotely operated repair tools.

An improved building access system includes a turntable having an upper surface and a lower surface, a main tower attached to the turntable's upper surface, a boom tower pivotally attached to the turntable and disposed so as to form an angle with the main tower, and a balancing tower also pivotally attached to the turntable and also disposed so as to form an angle with the main tower. It also includes means for changing these angles between the main tower and, respectively, the boom tower and the balancing tower, and a cathead pivotally attached to the end of the boom tower which is opposite the end attached to the turntable. The inventive apparatus also includes pressure sensing devices located and disposed so as to measure the pressure at each mounting point where the main tower is attached to the turntable, along with one or more leveling rods disposed so that, as the boom tower is raised upwardly and the angle between the main tower and the boom tower decreases in value by an associated amount, the angle between the cathead and the boom tower decreases in value by the same amount. The turntable may further include at least one support arm configured so that the bending forces experienced by the turntable are transferred to a larger diameter support structure. The invention also includes an elongated beam member which is especially useful for forming box beams, which member has a pair of symmetrical planar side elements which are perpendicular to each other and which are also connected together by a diagonal element.

A portable davit includes a base having a mounting portion and a housing. The housing defines a cavity. An end of a mast is positioned within the cavity. A jib is coupled to another end of the mast. A connector is coupled to the jib. A hoist is coupled to a platform and includes a drive and a rope. An end of the rope is wound about the drive. Another end of the rope is coupled to the connector. The drive is configured to rotate relative to the platform in a first direction to decrease a distance between the platform and an end of the jib and to rotate relative to the platform in an opposite second direction to increase the distance between the platform and an end of the jib. Systems and methods of use are provided.

A portable davit includes a base having a mounting portion and a housing. The housing defines a cavity. An end of a mast is positioned within the cavity. A jib is coupled to another end of the mast. A connector is coupled to the jib. A hoist is coupled to a platform and includes a drive and a rope. An end of the rope is wound about the drive. Another end of the rope is coupled to the connector. The drive is configured to rotate relative to the platform in a first direction to decrease a distance between the platform and an end of the jib and to rotate relative to the platform in an opposite second direction to increase the distance between the platform and an end of the jib. Systems and methods of use are provided.