Integrated thermal rod pile foundation structure and construction method thereof

Abstract

The invention discloses an integrated thermal rod pile foundation structure and a construction method thereof. The integrated thermal rod pile foundation structure comprises a thermal rod, and furthercomprises a pile foundation, a bearing platform and a bridge pier which are sequentially arranged from bottom to top; the thermal rod penetrates through the bearing platform to be axially embedded inthe pile foundation; and the evaporation section of the thermal rod extends to the bottom of the pile foundation, and the condensing section of the thermal rod is exposed out of the upper part of thebearing platform. The construction method comprises the steps: 1, parameters are determined; 2, the pile foundation is drilled; 3, a pile foundation reinforcement cage is rolled, the thermal rod is fixed, and pile foundation concrete is poured; 4, bearing platform and bridge pier concrete is poured; and 5, curing is conducted. The refreezing time of the concrete pile foundation can be effectivelyshortened, the construction period of bridge engineering in a permafrost area is shortened, and the limit carrying capacity of the pile foundation is improved.

Description

technical field [0001] The invention relates to the technical field of traffic infrastructure construction engineering, in particular to an integrated hot-rod pile foundation structure and construction method for pile group foundations in permafrost regions. Background technique [0002] Along the Qinghai-Tibet Expressway (especially the last construction section of the Beijing-Tibet Expressway - the Golmud-Lhasa section), there are more than 550km of permafrost areas. Permafrost refers to various rocks and soils that are below zero degrees Celsius and contain ice. Frozen soil has rheological properties and is extremely sensitive to temperature, and its long-term strength is much lower than the instantaneous strength characteristics. Frozen soil freezes like ice in the cold season, and as the temperature drops, the volume expands, and the engineering structures built in the permafrost area will be lifted and squeezed by the "fat" frozen soil; in summer, the thawed As the vo...

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Problems solved by technology

[0004] However, in the design process of existing bridge projects in permafrost areas, based on the unique properties of permafrost, in order to avoid disturbance to permafrost, single-pile foundations are often set up. As the freezing and thawing of permafrost occur repeatedly and alternately, it is easy for the foundations on each side to be lifted due to different forces, or to crack, tilt, or even collapse in severe cases. In order to solve these problems, it is necessary to Repairing and renovating the problematic single pile by inserting hot rods will undoubtedly require repeated construction, disturbing the permafrost many times and failing to achieve ideal heat absorption and heat dissipation

[0005] Although there is a practice of setting hot rods directly around the single pile during the construction process to reduce maintenance costs, on the one hand, the foundation load of the single pile is low, and once a problem occurs in a single pile, the entire project progress will be affected; on the other hand, The connection between the hot rod and the single pile is unstable and the failure rate is high. At present, there is no better way to solve the above problems in the permafrost region

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