Vibration method for pre-tensioning prefabricated track boards

Abstract

The invention relates to the field of pre-tensioning prefabricated track board manufacturing, in particular to a vibration technology for bi-directional pre-tensioning prefabricated track boards. According to the vibration method, in the vibrating process, a cross beam of vibration motors is horizontally mounted at the bottoms of moulds, the side faces of the moulds are also provided with vibration motors; the moulds are vibrated in the mode combining bottom vibration and marginal vibration, and the distance between two adjacent vibration motors mounted on the same beam provided with the vibration motors is larger than 2.0 m; concrete with the slump degree ranging from 60 mm to 120 mm is poured at the speed ranging from 7 mm / min to 12 mm / min with the changing speed of the height of the concrete in the moulds as a unit; during pouring, the vibration motors vibrate at the vibration frequency ranging from 105 Hz to 115 Hz. By means of the vibration method, the situation that skin sticking happens to the four side faces of each pre-tensioning prefabricated track board, and excessive pores or big holes appear in the pre-tensioning prefabricated track boards is avoided, partial segregation is prevented in the pouring and vibrating process, and the thickness of laitance is controlled below 12 mm.

Description

technical field [0001] The invention relates to the field of pretensioned prefabricated track slab manufacturing, in particular to a vibration technology for bidirectional pretensioned prefabricated track slabs. Background technique [0002] In the production process of CRTS series slab ballastless track concrete track slabs (hereinafter referred to as "track slabs"), in order to avoid deformation and cracking, it is usually necessary to pre-apply compressive stress to the track slabs by means of tensioning and anchoring to form prestressed reinforced concrete. , to improve the crack resistance and stiffness of the component, and increase its durability. [0003] In the prior art, two construction methods, pre-tensioning and post-tensioning, are mainly used to manufacture prestressed reinforced concrete; pretensioning construction refers to the construction method of pouring concrete after stretching the prestressed steel bars. [0004] The main steps of pre-tensioning cons...

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Problems solved by technology

[0006] CTRSⅢ bidirectional pretensioned prestressed concrete track slab is a new track slab developed by China Railway 23rd Bureau. During its manufacturing process, air holes, sticky skin and local mortar are prone to appear on the four sides of the track slab. Accumulation, laitance is too thick, and after experimental research, due to its special manufacturing process, the above problems cannot be solved with conventional existing technologies

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