Method for controlling emptiness sound of bearing plate of prestressed post-tensioned box beam

Abstract

The invention belongs to the technical field of prefabrication of simply-supported railway beams, and in order to solve the problem that a bearing plate has an emptiness sound because of dense steel bars at the bearing plate, poor passability and difficult ramming of concrete, and the like during the prefabrication of a simply-supported railway beam, provides a method for controlling the emptiness sound of the bearing plate of a prestressed post-tensioned box beam. The method comprises the following steps: before installation of the bearing plate, gravels are uniformly adhered to the inner surface of the bearing plate through steel adhesive; at the beginning of concrete pouring of a beam body, concrete is dispensed from a web plate on the top surface of the beam body; and after the beginning of the concrete pouring, the concrete is rammed through own flowability of the concrete and in combination of a vibrorammer, so that the concrete flows into the bearing plate completely; and after the concrete at the bearing plate is compacted, the concrete is dispensed from the end head of the beam. By a new concrete pouring method, the emptiness sound caused by incompactness at the bearing plate in the concrete pouring process of the post-tensioned box beam is effectively controlled; and the emptiness sound caused by shrinkage and creep of concrete in the later period is effectively controlled by adhering the gravels, so that the product quality is improved and the later maintenance is reduced.

Description

technical field [0001] The invention belongs to the technical field of railway simply supported beam prefabrication, and in particular relates to a method for controlling the fasting sound of a prestressed post-tensioned box girder bearing plate. Background technique [0002] In recent years, ballastless tracks have been widely used in railway passenger dedicated lines (high-speed railways). Due to the limitation of speed standards, bridge projects account for nearly 40% of the line, and most of them are prestressed simply supported box girders. Therefore, their prefabricated construction is the most critical. Prefabricated beams are generally produced in factories. Before the prefabricated beams are erected, the bridge supports are first installed on the bearing plates of the prefabricated beams, and then the anchor bolts of the supports pass through the anchor bolt holes on the pad stones and are fixed to the pad stones by grouting. The self-weight of the prefabricated bea...

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Problems solved by technology

[0003] The present invention provides a control prestressed post-tensioned box girder in order to solve the problem of fasting sound in the support plate caused by dense steel bars, poor concrete penetration, and difficulty in vibration in the simply supported box girder prefabrication. Bearing plate fasting sound method

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