Low altitude prefabricated case beam internal mold construction method

Abstract

The invention discloses a low-height prefabricated box girder internal mold and a construction method thereof. The internal mold comprises an external mold and the internal mold arranged inside the external mold; the internal mold comprises a bottom template and a top template arranged above the bottom template, wherein, the two side edges of the top template are respectively connected with a first upper side template in a welding way, the side edge of the bottom template of the internal mold is connected with the lower side edge of a lower side template in a pin joint way, the lower side edge of a second upper side template is connected with the upper side edge of the lower side template in a welding way; a plurality of steel ear plates provided with holes are arranged on the bottom template, a through long connecting rod connected with a threaded sleeve is arranged in each hole, the two ends of a plurality of mandrils are respectively connected with the top template and the through long connecting rod by articulating equipment; two rows of sliding rods are respectively arranged on the bottom template, a sliding sleeve which is matched with the sliding rod in a sliding way is inserted on each sliding rod, and each sliding sleeve is respectively connected with the lower side template by a side connecting rod in a pin joint way. The adoption of the internal mold leads to large rigidity and small deformation, and the adoption of the method leads to fast installation and convenient withdrawing.

Description

technical field [0001] The invention relates to a box girder inner formwork construction structure, in particular to a medium-small-span and low-height prefabricated box girder inner formwork and a construction method thereof. Background technique [0002] In highway bridge construction, the application of prestressed prefabricated box girder is more and more common. And its prefabricated box girder inner mold mostly adopts combined formwork. It is the most widely used formwork form in engineering construction. It is composed of several types of plates with a certain modulus, angle formwork, supports and connectors, and it can be used to spell out various sizes and geometric shapes. It can be directly assembled on site during construction, or it can be pre-assembled into a large formwork or component formwork and hoisted and installed by a crane. The plates of the combined formwork are made of all steel, and are also made of composite steel frames and wood (bamboo) plywoo...

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Problems solved by technology

[0003] However, these four patents all use the hydraulic cylinder system. Although they have a series of advantages, after the outer mold is supported, the remaining space in the outer mold is limited, so the specific construction conditions are limited, such as: people cannot enter at all, and equipment is also limited. Unable to erect

For the box girder with narrow net space in the beam body, especially limited by the volume of the equipment and the size of the hydraulic mechanism, the above patented method and structure are not applicable

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