Technology for settlement control of hollow rigid plate after construction of deep soft soil foundation of high-level embankment

Abstract

The invention discloses a technology for settlement control of a hollow rigid plate after construction of a deep soft soil foundation of a high-level road embankment. The technology comprises the following steps: flattening a roadbed, and filling a broken stone hardcore; mounting a template on the spot; blending and conveying concrete; spreading and vibrating the concrete; setting a joint; finishing a surface; maintaining the concrete and jointing; and filling a road embankment. The template is a template with holes, and the holes are linearly arranged on the template. The direction of the holes at two sides is perpendicular to the road driving direction and is parallel to the road cross-section direction. The diameter of each of the holes is gradually changed, and the diameter of each of the holes in the center of the road embankment is smaller than the edge of the road embankment by 30-50%. Two layers of horizontal steel bars and longitudinal steel bars are distributed at the bottom of a hollow concrete plate, so that the non-uniform settlement of the center and the edges of the road embankment can be effectively reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of civil engineering, and in particular relates to a hollow rigid plate technology for controlling post-construction settlement of deep and thick soft soil foundations of high-grade embankments. Background technique [0003] my country's expressway construction is developing rapidly, and most of my country's expressways are located in the eastern coastal areas. There are a lot of soft soil foundation problems in the construction of expressways in coastal areas. In the construction of expressways in soft soil areas, it is necessary to solve the problem of uneven settlement of the roadbed, which is especially important in the control of post-construction settlement. my country's "Code for Design of Highway Subgrade" (JTG D30—2004) stipulates that the post-construction settlement of general road sections is less than 30 cm. [0004] In recent years, my country's highway construction has developed rapi...

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Problems solved by technology

And all kinds of treatment methods have obvious advantages and disadvantages. Among them, the disadvantage of PVC drainage plate (bag sand well) is the shortcoming of surcharge preloading, which is a long construction period. If the heap height is too high, the cost will be significantly increased; The disadvantage of vacuum preloading in sand wells is that the process requirements are high, especially the water-stop curtain and vacuum sealing film must be sealed, and the cost is slightly higher than that of surcharge preloading; When it is large, the treatment effect is not good, and when the water content is high, it will affect the strength of the single pile, and the cost is high; Difficult to control, small increase in bearing capacity, etc.

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