Beam-less and column-free staircase and its construction method

Abstract

The invention discloses a new type of staircase without beams and columns, which comprises an enclosure structure formed by interconnecting a rear side wall, a left end wall, a front side wall and a right end wall. The enclosure structure is provided with concrete load-bearing poured along the left and right directions. The middle partition wall, in terms of structural relationship, endows the middle partition wall of the staircase with the double function of separating space and bearing the weight of the stair tread, and changes the stair tread from the existing longitudinal force along the stair tread to the horizontal force, and the calculation span of the stair tread structure is greatly improved. The thickness of the ladder plate can be reduced to about 100 mm without setting the ladder beam. Under the dual objectives of meeting the specifications and maximizing the effective building use area, the present invention significantly improves the use space of the stairwell, which is of great significance to the urban underground buildings where every inch of land is expensive, and avoids problems such as Safety, meeting and other issues, for underground buildings with limited space, it also significantly reduces the design difficulty of the stairwell structure.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a staircase structure and a corresponding construction method, which are suitable for evacuation staircases of underground space structures. Background technique [0002] In the urban core area where every inch of land is expensive, underground space resources are becoming increasingly tense. Underground space structures such as subways and underground garages are gradually developing deeper. [0003] Evacuation stairs are a safe passage for vertical evacuation of personnel, and also the main path for firefighters to enter underground buildings for fire fighting and rescue, and its importance is self-evident. [0004] Section 6.4 of the "Code for Fire Protection Design of Buildings" clearly stipulates: "The underground or semi-underground part of the building and the above-ground part should not share the stairwell. hour) fire partition walls and Class B fire doors co...

AI Technical Summary

Problems solved by technology

[0013] The second method does not set the ladder beam 33, and the rest platform 32 and the step board 31 form a longitudinal folded plate, the length of which can even reach 8-10m. If the length of the folded plate is too long, the thickness of the step plate 31 is more than 350 mm (millimeters). Force calculation requirements, on the one hand, more materials are used, and more importantly, the increase in the thickness of the stair plate 31 also encroached on the net height space of the stair section

[0014] If the civil air defense staircase is also used as an evacuation staircase, the civil air defense load needs to be considered. The calculated thickness of the stair plate 31 even exceeds 600mm, which is not ideal for economy and safety.

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