Zigzag prefabricated beam and its preparation method and installation construction method

Abstract

The invention relates to a Pi-shaped precast beam and a preparation method thereof as well as mounting and a construction method of the precast beam, which belong to the field of constructional engineering. The cross section of the Pi-shaped precast beam is shaped like Pi; the Pi-shaped precast beam comprises a top plate, web plates and separated bottom flange plates, wherein the web plates are arranged on the two sides. During assembling on the construction site, the bottom flange plates on the adjacent sides of the two parallel Pi-shaped precast beams are connected with each other to form a box shape; and the appearance of the whole bridge is as same as that of the traditional small box girder bridge. End transverse diaphragms are precast at the two ends of the Pi-shaped precast beams; and middle transverse diaphragms are precast in the middle of the Pi-shaped precast beams. Shear connectors are embedded in the top plates of the Pi-shaped precast beams; after assembling on the construction site, the shear connectors are connected with precast bridge deck slabs or cast-in-place bridge deck slabs. The thickness of the top plates can be more than 15cm; the bridge deck slabs do not need to be arranged on the top plates; and after a permanent formwork is mounted between the top plates, concrete is poured between the permanent formwork and the top plates to connect the permanent formwork with the top plates. The Pi-shaped precast beam provided by the invention is advantaged in that a problem that an internal mold is difficult to locate and detach in the process of pre-casting the traditional small box girder is solved; the quality of a precast piece is convenient to visually check; the precast pieces are convenient to precast, transport and assemble; the construction qualities of the transverse diaphragms after the precast pieces are assembled are guaranteed; and the integrity and durability of the whole bridge are more reliable.

Description

technical field [0001] The invention relates to a zigzag-shaped prefabricated beam, a preparation method and an installation construction method thereof, and belongs to the field of construction engineering. Background technique [0002] The prefabricated installation construction method is fast, and the quality of components is easy to be guaranteed, and it is widely used in bridge construction. Among the commonly used prefabricated beams, the small box girder has the advantages of larger section torsional strength, flexural strength, small shear stress and good stability. The small box girder bridge assembled from it can well meet the high-speed, stable and comfortable requirements of high-grade highway driving, and is more beautiful, and has gradually become the first choice for prefabricated simply supported girder bridges and simply supported variable continuous girder bridges. However, the small internal space of the prefabricated small box girder increases the diffic...

AI Technical Summary

Problems solved by technology

However, the small internal space of the prefabricated small box girder increases the difficulty of installing and removing the inner formwork. The inner formwork is easy to float up during the pouring of concrete, and the quality inside the box is not easy to check during construction; It is difficult to pour the diaphragm, the quality is not easy to guarantee, and it is not easy to check and maintain

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