Precast prestresed-concrete beam-type stair and making construction method

Abstract

The invention discloses a precast prestresed-concrete beam-type stair and a making construction method, and belongs to the technical field of constructional engineering. The precast prestresed-concrete beam-type stair structurally comprises a beam-type stair body, an upper stair beam and a lower stair beam, wherein the upper stair beam and the lower stair beam are used for supporting the beam-typestair body; the beam-type stair body comprises a stair-section slant beam and ladder-shaped steps, the stair-section slant beam is arranged in the length direction of the beam-type stair body, the two ends of the steps are supported on the stair-section slant beam, the two ends of beam-type stair body are connected with the upper stair beam and the lower stair beam respectively, a prestresed reinforcing steel bar is arranged at the lower portion of the stair-section slant beam in the length direction, an upper common reinforcing steel bar is arranged at the upper portion of the stair-sectionslant beam in the length direction, stirrups are arranged outside the prestresed reinforcing steel bar and the upper common reinforcing steel bar in the length direction at equal intervals, the prestresed reinforcing steel bar and the upper common reinforcing steel bar are located in the stirrups, and step distribution reinforcing steel bars are arranged in the steps. The precast prestresed-concrete beam-type stair and the making construction method have the advantages of being large in application span, good in crack resistance, light in self weight, convenient to hoist and transport, excellent in earthquake resistance and the like.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a prefabricated prestressed concrete beam type staircase and a manufacturing and construction method thereof. Background technique [0002] As a component of vertical traffic between floors in a building, stairs are responsible for the important functions of personnel flow and disaster escape. There are two types of construction methods for reinforced concrete stairs: integral cast-in-place and prefabricated. The formwork process of the integral cast-in-place staircase is complicated and the mold cannot be reused, so the on-site construction takes a lot of man-hours, the construction period is long, the construction cost is high, and the environmental pollution is heavy. [0003] With my country's increasing requirements for green construction, energy conservation and emission reduction, and the substantial increase in labor market prices, prefabricated construc...

AI Technical Summary

Problems solved by technology

However, when the plate-type scissors ladder is used in buildings with large bays and storey heights, its own weight is relatively large, which makes it difficult to hoist, transport and install the stairs

In addition, when the span is large, the bottom of the slab is easily cracked during transportation and hoisting, which affects subsequent normal use

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