Long and short pile plate structure for controlling differential settlement of highway transition section and construction method of long and short pile-plate structure

Abstract

The invention discloses a long and short pile plate structure for controlling differential settlement of a highway transition section and a construction method thereof.The long and short pile plate structure comprises a transition section and a common section, reinforced concrete slabs are arranged on the transition section and the common section, and a plurality of prestressed pipe piles are arranged in the transition section and located below the reinforced concrete slabs; a plurality of cement mixing piles are arranged in a common road section below the reinforced concrete slab, the prestressed pipe piles and the cement mixing piles are directly and rigidly connected with the reinforced concrete slab, the lengths of the prestressed pipe piles are gradually decreased in the bridge road direction, and the pile intervals of the cement mixing piles are gradually decreased in the road bridge direction. The long and short pile plate structure and the construction method are good in reinforcing effect, reliable in technology, economical and reasonable, and uniform transition of longitudinal rigidity of the highway bridgehead transition section in the soft soil area can be achieved.

Description

technical field [0001] The invention relates to the technical field of expressway foundation treatment in soft soil areas, in particular to a long and short pile-slab structure for controlling uneven settlement of expressway transition sections and a construction method thereof. Background technique [0002] Soft soils with high moisture content, large void ratio, low strength, high compressibility and low permeability are widely distributed in the coastal areas of our country, and these areas are also high-speed traffic-intensive construction areas. Due to the significant creep and thixotropy characteristics of soft soil, if the foundation treatment measures are not targeted during the construction period, coupled with the disturbance of the surrounding environment and the traffic load during the operation period, uneven settlement of the soft foundation will easily occur, especially The bridge head jumping disease caused by differential settlement in the bridge head connec...

AI Technical Summary

Problems solved by technology

The combined structure adopts a single pile type and changes the pile length in the transition section. Since the rigid pile treatment improves the overall stiffness of the transition section foundation, a new difference in stiffness between the transition section foundation and the general road section foundation will occur, and new differential settlement may be formed. Secondary transition treatment is required; moreover, this structural form is easy to form suspended piles in soft soil foundations, resulting in the problem of difficult control of post-construction settlement, which cannot meet the requirements of variable stiffness between different road sections during expressway construction and operation. The requirements of sinking control and leveling transition cannot realize the effective adjustment and coordination of the overall stiffness of the foundation at the bridge head transition section of the expressway, and it is difficult to achieve the goal of solving the "bridge head jumping" disease

Images