Variable rigidity treatment system for vehicle jumping at bridge head of highway

Abstract

The invention belongs to traffic engineering, in particular to the field of highway construction, and in particular relates to a variable rigidity treatment system for vehicle jumping at a bridge head of a highway. According to different treatment objects and settlement control standards, a foundation is reinforced by adopting treatment modes of a pile foundation, a long and short combined rigid pile composite foundation and a long-plate short-pile combined loading foundation. For a bridge abutment foundation, the vertical rigidity of a pile foundation of the bridge abutment foundation is properly reduced, and the settlement of a bridge self is controlled in the allowable range of the bridge self; for a bridge head foundation, the treatment technology of the long and short combined rigid pile composite foundation is adopted, and a rigid pile can be selected from a low-strength concrete pile, a CFG pile or a prestressed tubular pile and the like according to the concrete engineering requirements and geological conditions; and after leaving a certain distance from the bridge abutment, the foundation is reinforced by adopting the treatment mode of the long-plate short-pile combined loading foundation, the bearing capacity of a shallow foundation is improved and the settlement amount is reduced by using short piles (cement-soil piles or low-strength piles), and a drainage concretion process of soft soil under the pile bottoms is quickened by combining an upper loading system through a plastic drainage board so as to achieve the aim of shortening the construction period and reducing post settlement or differential settlement.

Description

technical field [0001] The invention belongs to the field of traffic engineering, especially expressway construction, and in particular relates to a variable stiffness foundation treatment system for expressway bridge head jumping. Background technique [0002] Vehicle jumping at bridgeheads often leads to unsatisfied highway transportation functions, induces and aggravates bridge diseases, shortens the service life of vehicles, and affects traffic safety. The problem of vehicle jumping at bridgeheads on expressways has long been an internationally recognized road traffic technical problem. It is generally believed that the bridge abutment basically does not settle, and the vehicle jumping at the bridge head is mainly caused by the large settlement of the backfill of the bridge head abutment and its foundation under the action of natural environment and load. At present, domestic highway departments and scientific research units adopt various methods to solve the problem of ...

AI Technical Summary

Problems solved by technology

As far as the current situation is concerned, cement mixing pile composite foundation has obvious effect in strengthening soft soil, and the construction period is short, but the cost is relatively high and the construction quality is difficult to control. At the same time, the depth of its treatment is limited (generally 10-15m)

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