In order to improve the construction progress of prefabricated buildings, prefabricated stairs are usually selected as the stairs of prefabricated buildings. However, the hoisting of prefabricated scissor ladders in prefabricated buildings is not synchronized with the construction of floor structural surfaces, resulting in safety hazards at the entrance and edge of the stairwell. There is no operating platform for the formwork support in this floor’s stairwell and no access to the upper and lower floors. Therefore, it is necessary to invent a multifunctional platform for prefabricated building scissor style staircases to improve the safety and progress of the construction of prefabricated building scissor style staircases..

At present, there are many research achievements on multifunctional platforms for prefabricated building stairwells, but among the research achievements on multifunctional platforms for prefabricated building scissor style stairwells, there are few that can simultaneously support formwork, protect the edges of openings, and provide up and down working surfaces. A multifunctional scissor ladder platform for prefabricated buildings was designed, which combines the characteristics of asynchronous lifting of prefabricated scissor ladders and construction of floor structural surfaces in prefabricated buildings. This platform effectively solves the problems of formwork support, edge protection of openings, and up and down working surfaces for operators in the stairwell..

The existing prefabricated building scissor style staircase adopts the construction method of “steel pipe+hot-dip galvanized profiled steel springboard”. After the installation of each prefabricated scissor ladder, the staircase template operation scaffolding and edge protection scaffolding are erected. When the prefabricated scissor ladder needs to be lifted, the scaffolding and edge protection for this operation are removed, and the operator also needs to set up a staircase frame on the up and down work surface..

The existing installation methods have low safety, limited functionality, and are repetitive and labor-intensive. Therefore, the functional requirements and characteristics of the multifunctional platform are reflected in the following aspects..

Flat Steel Anchor

(1) The formwork at the stairwell does not have an operating surface, which meets the safety requirements for formwork support of walls, columns, and prefabricated scissor ladder steel support beams at the stairwell..

(2) Before hoisting the prefabricated scissor ladder, the stairwell is an edge opening that meets the requirements for edge protection on the working floor..

(3) Before hoisting the prefabricated scissor ladder, provide a safe passage for operators to climb up and down the working surface from the stairwell..

According to the functional requirements and characteristics of the multifunctional platform, if the platform’s force transmission path is directly carried by the stair steps, the platform height is high, and the platform shakes greatly during use. Therefore, it is considered to use the stair steel support beam to directly bear the load, and the platform’s force is directly transmitted to the stair steel support beam through 8 expandable crossbars, At the same time, the overall height of the platform has been reduced, which has improved the safety of construction personnel conducting construction operations on the platform. Eight retractable crossbars are equipped with locking devices to prevent the movement of the retractable crossbars, further improving the safety of the platform during lifting, use, and removal. The installation process for the multifunctional platform is as follows. (1) Lift the multifunctional platform of the prefabricated building staircase into the scissor style staircase of the prefabricated building. (2) Remove the pins, adjust all 8 extendable crossbars to the steel bracket beam, insert the pins to fix the extendable crossbars, and place the multi-functional platform in the stairwell of the prefabricated building. (3) Erect the staircase wall columns and staircase steel support beam formwork on the two-level operation platform, pour concrete, and dismantle the staircase formwork to obtain the staircase wall. (4) Lift the multifunctional platform of the prefabricated building staircase into the suspended working floor staircase, retract the 8 retractable crossbars to the innermost point, insert them into the pins for fixation, and remove the multifunctional platform of the prefabricated building staircase. (5) Pre order.