An electrically insulated trellis comprises a first array of parallel tubular members 2 and a second array of parallel tubular members 4. Each of the second array of parallel tubular members 4 is pivotably connected to a plurality of the first array of parallel tubular members 2 whereby to form a trellis 1. Each of the tubular members is formed from glass-reinforced polymer. A first set of fibres in the glass-reinforced polymer are substantially parallel and aligned in a first direction and a second set of fibres in the glass-reinforced polymer, distinct from the first set, are substantially parallel and aligned in a second direction different to the first direction.

A scaffold board (10) of extruded thermoplastic material. The board (10) includes a substantially rectangular outer profile and a plurality of strengtheners (20). The substantially rectangular outer profile is defined by a top wall (12), a bottom wall (14) and a pair of side walls (16, 18). The plurality of strengtheners (20) each extend between an inner surface of the top wall and an inner surface of the bottom wall. Each of the strengtheners have a middle part (20c), a pair of top parts (20a, 20b), and a pair of bottom parts (20d, 20e). The middle part (20c) is oriented normally to the plane of the top wall (12) and the bottom wall (14). The pair of top parts (20a, 20b) each extend outwardly from a top of the middle part (20c) to the inner surface of the top wall (12) in substantially equal and opposite directions respectively. The pair of bottom parts (20d, 20e) each extend outwardly from a bottom of the middle part (20c) to the inner surface of the bottom wall (14) in substantially equal and opposite angles.

A scaffold board (10) of extruded thermoplastic material. The board (10) includes a substantially rectangular outer profile and a plurality of strengtheners (20). The substantially rectangular outer profile is defined by a top wall (12), a bottom wall (14) and a pair of side walls (16, 18). The plurality of strengtheners (20) each extend between an inner surface of the top wall and an inner surface of the bottom wall. Each of the strengtheners have a middle part (20c), a pair of top parts (20a, 20b), and a pair of bottom parts (20d, 20e). The middle part (20c) is oriented normally to the plane of the top wall (12) and the bottom wall (14). The pair of top parts (20a, 20b) each extend outwardly from a top of the middle part (20c) to the inner surface of the top wall (12) in substantially equal and opposite directions respectively. The pair of bottom parts (20d, 20e) each extend outwardly from a bottom of the middle part (20c) to the inner surface of the bottom wall (14) in substantially equal and opposite angles.

A bridge plank applicable to construction sites includes a main board, a left wall and a right wall which are respectively disposed at two sides of the bottom of the main board. The left and right walls are integrally molded with the main board. Front and back ends of the main board are each provided with an end cap. The left and right walls are identical in structure and each includes an outer wall. Bottoms of the outer walls are bent towards the inside of the main board to form footings that are parallel to the main board. Ends of the lower bent footings are then bent upwards to form inner walls. Top edges of the inner walls are in direct contact with the bottom of the main board. Compared with the prior art, this bridge plank is strengthened in rigidity and completely eradicates potential safety hazards.

A bridge plank applicable to construction sites includes a main board, a left wall and a right wall which are respectively disposed at two sides of the bottom of the main board. The left and right walls are integrally molded with the main board. Front and back ends of the main board are each provided with an end cap. The left and right walls are identical in structure and each includes an outer wall. Bottoms of the outer walls are bent towards the inside of the main board to form footings that are parallel to the main board. Ends of the lower bent footings are then bent upwards to form inner walls. Top edges of the inner walls are in direct contact with the bottom of the main board. Compared with the prior art, this bridge plank is strengthened in rigidity and completely eradicates potential safety hazards.

The present invention provides a hammering assembly type fixing device for a shipyard, in which the lower end of a fixture is inserted into a fixing groove formed in a fixing plate (made of a rigid bottom such as steel, concrete, rock, etc.) and the upper end of the fixture is screwed to be coupled to a separate fastening element, such that a grating, a work foothold, etc. are fixed. The hammering assembly type fixing device for a shipyard according to the present invention is configured such that a protruding flange inclined downward is integrally formed with a fixture to form a single body at a portion where an upper end and a lower end of a fixture are connected to each other, and a packing ring is provided to be inserted into the lower end of the fixture in close contact with the protruding flange. As such, as the fixture is fixed to the fixing plate by the pressing from the hammering, the hammering assembly type fixing device has the characteristics of being resistant to lateral forces and preventing breakage of the lower end due to a primary fixing by the lower end and a secondary fixing by the protruding flange. Further, the pressing force of the protruding flange of a downwardly inclined structure, and the improved sealing property by the packing ring, and the excellent foreign substance blocking effect are obtained. Moreover, the manufacturing process of the fixture is simplified, thereby reducing the manufacturing cost. Especially, the hammering assembly type fixing device for a shipyard is applied to fix a grating installed in a shipyard, so that even in high salt conditions due to the inflow of seawater through various routes in shipbuilding processes, the fixing force of the fixture with respect to the fixing plate is maximized and the airtightness by the packing ring is improved, thereby preventing the occurrence of fine gaps between the fixing plate and the fixture. Therefore, the penetration of salt is blocked, thereby preventing the corrosion of the fixture and improving durability of the fixture.

The present invention provides a hammering assembly type fixing device for a shipyard, in which the lower end of a fixture is inserted into a fixing groove formed in a fixing plate (made of a rigid bottom such as steel, concrete, rock, etc.) and the upper end of the fixture is screwed to be coupled to a separate fastening element, such that a grating, a work foothold, etc. are fixed. The hammering assembly type fixing device for a shipyard according to the present invention is configured such that a protruding flange inclined downward is integrally formed with a fixture to form a single body at a portion where an upper end and a lower end of a fixture are connected to each other, and a packing ring is provided to be inserted into the lower end of the fixture in close contact with the protruding flange. As such, as the fixture is fixed to the fixing plate by the pressing from the hammering, the hammering assembly type fixing device has the characteristics of being resistant to lateral forces and preventing breakage of the lower end due to a primary fixing by the lower end and a secondary fixing by the protruding flange. Further, the pressing force of the protruding flange of a downwardly inclined structure, and the improved sealing property by the packing ring, and the excellent foreign substance blocking effect are obtained. Moreover, the manufacturing process of the fixture is simplified, thereby reducing the manufacturing cost. Especially, the hammering assembly type fixing device for a shipyard is applied to fix a grating installed in a shipyard, so that even in high salt conditions due to the inflow of seawater through various routes in shipbuilding processes, the fixing force of the fixture with respect to the fixing plate is maximized and the airtightness by the packing ring is improved, thereby preventing the occurrence of fine gaps between the fixing plate and the fixture. Therefore, the penetration of salt is blocked, thereby preventing the corrosion of the fixture and improving durability of the fixture.

Disclosed is a rollable platform that may be unfurled in any orientation over exposed floor or ceiling joists. The platform may be constructed of a specific arrangement of support surface panels and underside joint panels to give the platform both (a) rigidity in a direction that is normal to the support surface via gridlock between the support surface panels and (b) foldability and/or rollability in a direction that is normal to the underside joint panels due to hinged interconnection.

Disclosed is a rollable platform that may be unfurled in any orientation over exposed floor or ceiling joists. The platform may be constructed of a specific arrangement of support surface panels and underside joint panels to give the platform both (a) rigidity in a direction that is normal to the support surface via gridlock between the support surface panels and (b) foldability and/or rollability in a direction that is normal to the underside joint panels due to hinged interconnection.

The invention concerns a deck (1) for forming an accessible area in a shoring tower (26), which can be used for fabrication or reconstruction of buildings, with a lifting lock (2) for avoiding take off of the deck (1) from an intended insertion position, preferably with two insertion hooks (2) each on both front sides, characterized in that the lifting lock (2) can also at a resting deck (1) switch from a detached position into a locked position only by force of gravity and/or the lifting lock (2) can switch from the locked position into the detached position by lifting the deck (1) through engaging at the lifting lock (2). Furthermore, a further developed system comprising a separate lifting and holding tool and a deck as well as a further developed shoring tower are disclosed. A very easy and safe assembly and disassembly can thereby be achieved.