Prefabricated GFRP pipe concrete pile and reinforced concrete slab top-mounted subgrade pile-slab structure

Abstract

The invention discloses a prefabricated GFRP pipe concrete pile and a reinforced concrete slab top-mounted subgrade pile-slab structure. The structure comprises the GFRP pipe concrete pile, a reinforced concrete slab, a metalling cushion layer and an embankment filling, the metalling cushion layer is arranged below the reinforced concrete slab, the top of the GFRP pipe concrete pile is in contactwith the bottom of the metalling cushion layer or penetrates through the metalling cushion layer to be connected to the bottom of the reinforced concrete slab, the embankment filling is placed above or below the reinforced concrete slab or wrapped on the outside of the reinforced concrete slab, on the one hand, the reinforced concrete slab is used for homogenizing loads transmitted to a foundationfrom the upper portion, and the GFRP pipe concrete pile is used for transferring the loads to a bearing layer deep in the foundation; on the other hand, a GFRP pipe forms a constraint on concrete, the concrete is placed in a three-direction stress state to improve the ductility of the concrete, thereby improving the bearing capacity and seismic ductility of the GFRP pipe concrete pile, and the GFRP pipe has strong corrosion resistance and excellent protection effect on the internal concrete and steel bars.

Description

technical field [0001] The invention belongs to the field of foundation engineering, and relates to a railway subgrade structure, in particular to a top-mounted subgrade pile-slab structure for high-speed railways. Background technique [0002] Today, with the rapid development of my country's economic construction, railway construction has also produced rapid progress, and the geological conditions for crossing have become complex. The settlement of soft soil subgrade has become one of the major problems faced in railway construction. The conventional soft soil subgrade treatment method requires a long construction period, and cannot fundamentally solve the problem of uneven settlement of the foundation. At present, the treatment methods for soft soil subgrade are mainly divided into shallow and deep treatment methods. The shallow treatment methods mainly include reinforced soil method, dynamic compaction method, replacement method and bagged manhole method, etc. The deep t...

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Problems solved by technology

Practice has proved that the current treatment methods generally have a long construction period, and there are also problems with the overall or partial subsidence of the subgrade. It is difficult to meet the requirements for some projects with tight construction schedules and high requirements for foundation deformation.

In order to solve these problems, a pile-raft composite foundation has emerged, which has high bearing capacity, high rigidity, and good stability, but the water content in the soft soil foundation is relatively high, especially in many areas where there are highly corrosive Geological conditions will cause strong corrosion to the pile body, causing safety hazards and high maintenance costs

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