Forming method of arc-shaped box girder formwork

Abstract

The invention discloses a forming method of an arc-shaped box girder formwork. The forming method comprises the following steps that (1) survey and setting out are conducted, specifically, coordinatesare determined, and field on-site setting out is conducted; (2) formwork materials are compared and selected, specifically, the formwork materials comprising a fiberglass formwork, a set-shaped steelformwork, a film plate and stainless steel composite formwork, a bridge inflatable core mould, an aluminum alloy formwork, a double-wall corrugated pipe and a plastic formwork are compared and selected; (3) the formwork materials are selected, specifically, the formwork materials comprising a box girder outer mould and a box girder inner mould are selected, the characteristics of an arc-shaped box girder are combined, the box girder outer mould adopts the film plate and stainless steel composite formwork, and the box girder inner mould adopts the double-wall corrugated pipe; (4) a bottom mould is laid; (5) side moulds are mounted; (6) an inner mould is mounted; and (7) edge moulds are mounted for reinforcement. The construction speed is high, the overall appearance quality and geometricaldimension precision of the arc-shaped box girder are remarkably improved, meanwhile, the construction safety is guaranteed, and the construction cost is saved.

Description

technical field [0001] The invention relates to an arc-shaped box girder formwork, in particular to a forming method for an arc-shaped box girder formwork. Background technique [0002] With the advancement of technology, traditional concrete box girder construction has been applied to long-span bridge engineering, subway station engineering, single-storey and multi-storey industrial plant columns, high-rise and super high-rise building projects, etc. Its construction methods are also changing with each passing day, such as integral steel formwork construction, rigid skeleton assembled wood formwork, rubber inner mold, etc., but some problems have appeared in the actual application process: [0003] 1. The cost of steel formwork itself is relatively high, and it cannot be reused for special-shaped box girders, and when there are conflicts between design drawings, it is difficult to adjust on site. [0004] 2. The pouring of the concrete box girder is a hidden project, and t...

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Problems solved by technology

[0003] 1. The cost of steel formwork itself is relatively high, and it cannot be reused for special-shaped box girders, and when there are conflicts between design drawings, it is difficult to adjust on site

[0004] 2. The pouring of the concrete box girder is a hidden project, and the quality of the concrete pouring cannot be visually inspected. When manual pouring and vibration are used, the construction quality can only be guaranteed by the operator's sense of responsibility and strict construction organization management. More troublesome, labor-intensive and time-consuming

[0005] 3. For special-shaped box girders with varying height and width, and when the minimum height of the box girder is only 1m, and the local clear height is only 60cm, manual removal of the inner formwork cannot be achieved.

[0006] 4. At present, the rigid skeleton assembled wooden formwork and combined steel inner mold widely used in construction generally takes about 10 hours to install, which is labor-intensive and time-consuming

Therefore, it is time-consuming and cost-intensive to remove the formwork

[0008] 6. The geometric shape of the commonly used rubber inner mold is formed by the rubber core mold, the shape is not easy to control, and it is quite different from the designed geometric shape

[0010] 8. The demoulding time of the rubber inner mold is not easy to control. In order to avoid the collapse of the roof concrete, it is easy to delay the demoulding time artificially, and the phenomenon that the inner mold and the concrete are bonded together occurs. Generally, the number of cycles is less, and the outer bag is easy to wear. If worn, it will bulge and affect the concrete formation

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