Connecting mechanism of expansion and contraction device

Abstract

The invention belongs to structures and construction of highway bridge expansion and contraction devices and particularly relates to a connecting mechanism of an expansion and contraction device. Theconnecting mechanism comprises embedded parts which are embedded in a concrete structure at the bottom of a preformed groove in a beam end or a bridge head at intervals and are assembled with anchoring ribs of the expansion and contraction device through overlap joint ribs. The embedded parts are integrally embedded in the concrete structure at the bottom of the preformed groove, the tops of the embedded parts are not higher than the bottom surface of an inner cavity of the preformed groove, assembling parts capable of forming fixed assembling with the anchoring ribs are included in the tops of the embedded parts and/or connecting plates capable of forming fixed assembling with the anchoring ribs are fixed to the tops of the embedded parts, and horizontal steel bars are connected in the overlap joint parts of the overlap joint ribs and the anchoring ribs of the expansion and contraction device in a penetrating mode. The connecting mechanism of the expansion and contraction device effectively solves the problems that in the prior art, an expansion and contraction device is long in construction period, high in construction difficulty and the like, and has the advantages of being lowin construction difficulty and intensity, high in construction speed, capable of facilitating standardized production and the like.

Description

technical field [0001] The invention belongs to the structure and construction of a highway bridge expansion device, in particular to a connection mechanism of the expansion device. Background technique [0002] The expansion device is an indispensable part of the bridge structure no matter it is on a bridge of any specification. In the bridge structure, it must adapt to the temperature change of the beam, the shrinkage caused by the creep and shrinkage of the concrete, the rotation of the beam end, the The joint changes caused by deflection and other factors, and directly bears the repeated load of the wheel, it is the weakest link in the bridge structure. The installation quality of the expansion device of the highway bridge is of great significance to ensure the service performance of the bridge, improve the driving comfort and ensure the service quality of the highway bridge. According to the requirements of "Expansion Devices for Highway Bridges" (JT / T 327-2016), expan...

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Problems solved by technology

[0003] The above-mentioned existing installation methods have the following problems: First, according to the construction requirements, the pre-embedded reinforcement must not be cracked, broken or missing. The cracked and broken steel bars should be repaired or planted according to the welding requirements in time. tendons need to straighten out

Since the lower part of the existing pre-embedded reinforcement is fixed in the concrete structure at the lower part of the reserved groove, and its upper part forms a raised door-shaped structure in the reserved groove, in practice, the upper part often protrudes due to careless operation or processing errors. The pre-embedded reinforcement is bent or broken, which delays the construction time and increases the construction cost; second, debris is easy to accumulate between the upper protruding pre-embedded reinforcement and the reserved groove (especially the asphalt and other debris on the surface are difficult to remove), When cleaning the sundries in the reserved tank before installing the telescopic device, it is usually necessary to use a special tool with a sharp front end to excavate slowly. The construction difficulty and strength are high, the sundries are not easy to clean, and the construction period is long; , it needs to be truncated, causing unnecessary troubles to the construction; Fourth, when the multi-piece beams are spliced, due to errors in the prefabrication and hoisting of the beams, the width of the reserved slots and expansion joints is different. In addition to the influence of the protruding pre-embedded ribs, it is not possible to use the cover plate to simply cover the expansion joints and then cover the filler when paving the bridge deck. It is cumbersome and labor-intensive to clean up the sundries in the pre-embedded groove before installing the expansion device. Large and long construction time

[0004] The applicant has not found any patent literature reports identical or similar to the present invention in the domestic patent database. At present, the research on the telescopic device is mainly focused on the structural improvement of the telescopic device itself.

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