Production method of large-span prestressed concrete hollow holed beam

Abstract

The invention discloses a production method of a large-span prestressed concrete hollow holed beam capable of accurately controlling technical parameters relative to rigidity of components in the premise that the opening ratio of a vertical section of the beam is fulfilled, that is to say, an opening area is more than 35%. The production method comprises an opening cracking resistance construction technology, a tall template support system construction technology, a holed mandrel locating and anti-floating technology, a prestress duct locating technology, a high-strength concrete self-compaction and vibration technology, and a bonded, unbonded and retard-bonded prestress technology. According to a method of holing on the vertical section of a beam body through construction of the large-span prestressed concrete hollow holed beam (the span is 27 m, the beam is 1.6 m high, a construction surface load is 13.9 kN / m<2>, and a centralized line load is 31.04 kN / m), the opening area is more than 35%. The production method appears for the first time at home and aboard, and the conventional method can bring huge technical risks and difficulties for construction. There is no relative literature report about researches and results of the construction technology of the prestressed concrete holed beam at home and aboard.

Description

technical field [0001] The invention relates to the general building structure of the international patent classification patent classification E04B; in particular, a method for making a large-span prestressed concrete hollow open beam. Background technique [0002] In the known technology, the traditional beam longitudinal section is opened to reserve and pre-embed the steel casing, the section opening rate is limited, and the construction technology is simple and easy. There are no special requirements for formwork, reinforcement and prestressed construction. However, for the construction of long-span prestressed concrete hollow open beams, for example, the span is 27m, the beam height is 1.6m, and the construction surface load is 13.9kN / m 2 1. When constructing a long-span beam with a concentrated line load of 31.04kN / m, if it is required to open holes in the longitudinal section of the beam body, and the area of ​​the holes accounts for more than 35%, there is no preced...

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