Requirements
In addition to the characteristics of stable structure and large bearing capacity, the portal scaffold must add some structural measures during use to enhance the support capacity of the portal. This is also the secret of the portal scaffold to be safe and not fall.
Before the construction of high formwork with a height above 4.5 m, the construction unit must prepare a special technical plan. The technical side should include the design, erection and demolition of formwork and its support, concrete pouring methods, observation of pouring process and safety control requirements. No construction is allowed without the preparation of technical plans.
In addition, the light weight of the portal scaffolding makes it easy to assemble and disassemble, which also reduces the labor intensity of construction workers. The design of the scaffolding tends to be lighter. The internal and external source dynamic steel pipes are selected. Type scaffolding saves more than 40%. Therefore, in terms of construction and disassembly, the labor intensity of the operating personnel is reduced, so that they are not so tired in the operation, the mental state is relatively good, and the safety factor naturally increases.
Installation standard
The gate-type scaffold is installed with its own standards, and it should be uniform and have a stable support system in two directions perpendicular to each other. Before the installation, the line must be strictly placed according to the design requirements on the ground. When installing the mast support, it is required to add a 48 x 3.5 steel pipe horizontal tie rod for each layer of mast installation. Longitudinal, vertical and horizontal Scissor supports are arranged with a spacing of less than 6m. The supporting force of the portal steel pipe scaffolding mainly depends on the overall force of the support frame. To exert this overall effect, the thin and horizontal portal frames must be “bundled” by horizontal and vertical horizontal rods and vertical and horizontal scissors braces. If horizontal and horizontal horizontal rods and vertical and horizontal scissors are not provided, it is easy to break like chopsticks, and the portal support is easy to collapse. This situation must be eliminated. The extension length of the adjustable bolt of the adjustable bracket (base) should not be greater than 200 mm. When the extension length of the adjustable bracket (including the base) is greater than 200 mm, a fixed measure of adding a horizontal tie rod can be taken. Many operators do not understand this, unscrew the bolts for a long time, and take no measures to strengthen them, which will greatly reduce the stress on the gantry and often lead to collapse accidents.
In terms of connection construction, the tightening torque of various connection fastener bolts of the door frame is between 40 ~ 65 Nm, in order to prevent the components from bearing effectively or being damaged. After the installation is completed, a random sampling inspection with a wrench is carried out. Until qualified. It is not allowed to loosen the connection members or bolts without tightening or disassembly at will after installation, so that the portal scaffold is deformed and damaged. Support poles should be vertical, and horizontal poles should be flat. Vertical poles should be used as long as possible. If you need to take over, the joints should be staggered and not within the same step. The pole mouths must be docked according to the specifications to ensure the verticality of the frame. The joints of two adjacent longitudinal horizontal rods should be staggered with each other, and the joints must be butted according to the specifications.
Accident rescue measures
In the event of a scaffold collapse, do not blindly go to the rescue. If there is an emergency that jeopardizes the safety of electricity, you should immediately cut off the power supply, organize rescuers under the condition of confirming that there is no risk of further collapse, and take effective measures to rescue. Rescue the property again. Only by paying attention to these matters and adopting these structural measures to strengthen the support of the portal scaffold, the portal scaffold can function effectively and safely, and can prevent the operator from falling from a height to the greatest extent.