Vibrating automatic precast prestressed concrete stair mold and making method

Abstract

The invention discloses a vibrating automatic precast prestressed concrete stair mold and a making method, and belongs to the technical field of constructional engineering. The vibrating automatic precast prestressed concrete stair mold structurally comprises a base, sliding rails, supporting channel steels, an upper mold plate, a opposite-pulling device and a high-frequency vibrating motor; the upper mold plate comprises a bottom mold, a fixed side mold, a movable side mold and an end mold; the peripheries of the fixed side mold, the end mold and the movable side mold are tensioned through opposite-pulling devices; the two sliding rails are arranged on the base; supporting channel steels are arranged at the two ends of the base in the length direction; the movable side mold is connected with rolling wheels through triangular supporting frames; the rolling wheels are arranged on the sliding rails; and a high-frequency vibration motor is arranged on the movable side mold. The inventionfurther discloses a making method of the vibrating automatic precast prestressed concrete stair. The vibrating automatic precast prestressed concrete stair mold has the advantages that no slurry leakage at the joint of the mold during concrete pouring is guaranteed, the stair surface flatness is improved, automatic vibration is achieved in the concrete pouring process, time and labor are saved, and the problems of embedded part displacement, prestress loss and the like are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a vibrating automatic prefabricated prestressed concrete staircase mold and a manufacturing method. Background technique [0002] Stairs are the vertical traffic components between floors in a building, and they are responsible for the important functions of personnel flow and disaster escape. Concrete stairs are oblique and irregular components. During cast-in-place construction, there are disadvantages such as complex formwork support procedures, many man-hours, long construction period, high construction cost, and heavy environmental pollution. With the transformation and upgrading of the national construction industry and the advancement of industrialization, prefabrication and assembly technology has been vigorously promoted and applied by the country. Concrete stairs are the most standardized prefabricated components. When the height of the building is fi...

AI Technical Summary

Problems solved by technology

[0003] With the increase of the span of prefabricated stairs, the self-weight of the structure increases significantly, which leads to difficulties in hoisting and installation of the stairs, and the cost of transportation and construction rises sharply. In addition, the large self-weight also easily causes cracks of the stairs, which affects the normal use function. For this reason, the patent CN207959747U proposes a Prefabricated prestressed concrete slab stairs, by applying prestress to reduce the thickness of the ladder slab and the self-weight of the structure, increase the applicable span of the stairs, and improve the crack resistance of the structure

Different from ordinary precast concrete stairs, prefabricated prestressed concrete stairs need to stretch prestressed steel wires, and the tension of a single prestressed steel wire is relatively large, which can reach 3-5t, which cannot be achieved with ordinary reinforced concrete staircase molds.

In addition, after the tensioning of the prestressed tendons is completed, the manual vibration method will easily cause the anchorage to loosen, resulting in the loss of the stress of the prestressed steel wire, reducing the effective prestress of the prefabricated stairs, and failing to realize the original design function

Images