A post for a temporary safety rail system comprising a base for reversible engagement with a floor, a rail holder to hold a rail in reversibly fixed engagement with the post and a plurality of components which are together operable to adjust the height of the post.

A scaffolding tube clamp having a pair of body portions defining a top and a base that are hinged together and receivable about a scaffolding tube. A rotatable bolt is received through a hole in the top a hole in the base portion. The bolt has a lower end with engagement means to releasably secure the bolt to the base. The bolt's head has a lower surface that is engageable with a surface on the top. The lower surface of the head, and the surface of the top that is engaged thereby, have complimentary ramped configurations such that when the bolt is rotated the ramps engage, resulting in the ramps moving the top toward the base. In an alternate embodiment the bolt is threaded with two sets of threads that have different diameters and different pitches and that are threadably received within the holes in the top and bottom.

A safety rail apparatus is provided, which comprises a post with a base configured to reversibly engage with a floor and providing support for at least 12 kN load, a rail holder configured to hold a rail in reversibly fixed engagement with the post and a plurality of components which are together operable to adjust the height of the post between a lower height of 900 mm-1.2 m and an upper height of 1.9 m-2.5 m. The plurality of compontents is further configured to adjust the height of the post to the lower height during one stage of a construction project and to the upper height during another stage of the construction project such that the upper height is at least 1.8 times higher than the lower height. The apparatus further comprises a mesh support configured to reversibly engage with the rail and support a mesh.

A safety rail apparatus is provided, which comprises a post with a base configured to reversibly engage with a floor and providing support for at least 12 kN load, a rail holder configured to hold a rail in reversibly fixed engagement with the post and a plurality of components which are together operable to adjust the height of the post between a lower height of 900 mm-1.2 m and an upper height of 1.9 m-2.5 m. The plurality of compontents is further configured to adjust the height of the post to the lower height during one stage of a construction project and to the upper height during another stage of the construction project such that the upper height is at least 1.8 times higher than the lower height. The apparatus further comprises a mesh support configured to reversibly engage with the rail and support a mesh.

A scaffold safety device (120) has a body (122) having an engagement formation (124) configured to engage with an element (20, 72) of a scaffold assembly (10). The device (120) also has a pressure sensor (126) configured to detect when the body is disengaged from the scaffold assembly. The engagement formation includes first and second arms (128, 130) extending away from the body. The arms are separated by a cavity (134). The cavity is configured to receive a threaded rod and a tightening nut (135) of the scaffold assembly. The pressure sensor is included on one arm (128) and is configured to detect when a pressure attains a predetermined threshold value. The pressure sensor is in communication with a control board (86) which is connected to an antenna (140) on a secondary scaffold safety device (142).

A clamp assembly adapted for efficient assembly and disassembly of scaffolding includes a pair of rotating clamp members and a wedge employed to temporarily hold the two clamp members in a closed position about a scaffolding support.

A clamp assembly adapted for efficient assembly and disassembly of scaffolding includes a pair of rotating clamp members and a wedge employed to temporarily hold the two clamp members in a closed position about a scaffolding support.

A combined member, comprising a communication rod (1) and a connecting rod (2), wherein the connecting rod (2) comprises a rod body (2.1) and a connector (2.2), the connector (2.2) being a fastening connector (3) or a sleeving connector (4), the rod body (2.1) of the connecting rod (2.1) and a rod body of the communication rod (1) being of a strip-shaped structure, the connecting rod (2) being connected to the communication rod (1) by the fastening connector (3) or the sleeving connector (4), the axis of the connecting rod (2) intersecting that of the communication rod (1) connected thereto. The combined member has the advantages of high bearing capacity, and convenient construction.

A modified scaffold component for use in modular scaffold systems allows securement to vertical uprights in a conventional manner and allows a work surface to pass over supporting uprights (if desired) to form a continuous work surface where securement of the modified scaffold component is below and does not interrupt the work surface.

A modified scaffold component for use in modular scaffold systems allows securement to vertical uprights in a conventional manner and allows a work surface to pass over supporting uprights (if desired) to form a continuous work surface where securement of the modified scaffold component is below and does not interrupt the work surface.