1.2m high stereotyped, tooled, standardized protective railings, 18cm high kicking plate situated at the stairwell, railing crossbar set to two, protection practices as shown in the figure.
1.2m-high stereotyped, instrumented and standardized protective railings, 18cm high skirting boards are set at the stairway entrance, and the railings are set with two cross bars. The protective method is shown in the figure.