Prefabricated assembled combination type door-shaped pillar and construction method thereof

Abstract

The invention relates to a prefabricated assembled combination type door-shaped pillar. Most of traditional door-shaped pillars are in rectangular solid concrete structures or box-shaped steel cover beam structures, door-shaped pillars in the rectangular solid concrete structures are large in masonry amount, high in dead weight and can only be constructed by a spot support cast-in-place scheme, and the door-shaped pillars in the box-shaped steel cover beam structures are high engineering cost, large in maintenance workload in late period and difficult to inspect and maintain. The prefabricated assembled combination type door-shaped pillar comprises bearing platforms and pillar columns on two sides, cast-in-place solid anchoring sections are arranged above the pillar columns, a cover beam formed by abreast splicing of a normal box beam section and box beam transition sections is connected between the two cast-in-place solid anchoring sections, all the normal box beam section and the box beam transition sections are in hollow structures, the normal box beam section is composed of a top plate, two lateral webs and a bottom plate, chamfers are arranged between the webs and between the bottom plate and the webs, and temporary supports which are grid-shaped steel frames are arranged between the box beam transition sections and the bearing platforms. The prefabricated assembled combination type door-shaped pillar in a concrete structure has the advantages that simplicity and convenience in designing and construction are facilitated, construction period can be shortened, engineering investment can be saved greatly and significantly, workload and difficulty in maintenance in the later period are lowered, and economy and reasonability are achieved.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a prefabricated and combined door-shaped pier and a construction method thereof. Background technique [0002] In recent years, my country's transportation infrastructure construction has developed rapidly, especially the development of high-speed railways represented by passenger dedicated lines and expressways in highway engineering. For three-dimensional intersections, when the angle between the two is small, portal piers become an economical and reasonable choice, which can greatly reduce the span across existing road bridges and save engineering investment. Its economic benefits are very obvious and have been obtained in actual projects. Lots of applications. [0003] The connection form of concrete pier and cast-in-place concrete (cover) beam or steel (cover) beam is mostly used in the design of existing portal piers. Cast-in-situ concrete (cover) be...

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Problems solved by technology

Cast-in-situ concrete (cover) beams need to set up brackets and pour concrete above the existing roads. The construction period is long and has an impact on the operation of the existing roads. In the case of railways, the implementation plan sometimes cannot even be approved by the existing line management; in order to reduce the operation interference to the existing roads, another door-shaped pier-steel (cover) beam scheme is extended, which adopts steel structure, self-weight It is relatively light, and hoisting is generally used for construction, but this scheme has many shortcomings such as high engineering cost, heavy maintenance workload in the later period, and difficulty in inspection and maintenance above the existing road (for the existing railway on the high-voltage catenary)

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