Assembled type flexible half-excavation foundation for electric transmission lines in mountainous areas

Abstract

The invention discloses an assembled type flexible half-excavation foundation for electric transmission lines in mountainous areas. The assembled type flexible half-excavation foundation comprises an upper slab, a base and an anchor cable used for connecting the upper slab and the base. The base is formed by splicing a plurality of prefabricated slabs and is in a circular truncated cone shape. The upper top face of the base is fixedly connected with a lower anchor slab through bolts. A steel cushion plate is arranged at the top of the upper slab. The center of the lower anchor slab and the center of the upper slab are each provided with a through hole used for allowing the anchor cable to penetrate through. The bottom end of the anchor cable is connected with the base through the lower anchor slab. The top end of the anchor cable is fixed to the upper slab through the steel cushion plate. An annular baffle is arranged on the lower surface of the upper slab. The circle center of the annular baffle is identical to the center of the upper slab. According to the assembled type flexible half-excavation foundation of the structure, the lower spliced type circular-truncated-cone-shaped base is embedded under undisturbed soil, by means of the structure, the uplift performance of the undisturbed soil can be brought into full play, and the uplift bearing capacity of the foundation is substantially improved; meanwhile, through the arrangement of the annular baffle on the lower surface of the upper slab, the horizontal load resistance of the foundation is improved.

Description

technical field [0001] The invention relates to an assembled flexible half-dug foundation for transmission lines in mountainous areas, belonging to the technical field of transmission lines. Background technique [0002] With the development of society, the demand for electricity is growing rapidly, and the construction of transmission lines of various voltage levels such as high voltage, ultra high voltage and ultra high voltage is in full swing. Foundation engineering is an important part of transmission line engineering construction. It is very important to choose a reasonable basic type and conduct optimization research to reduce the investment of transmission line engineering and ensure the safe operation of the line. [0003] At present, the commonly used foundation types for transmission lines in mountainous areas include "big excavation" slab foundations, excavated foundations, and excavated pile foundations. Among them, the "big excavation" slab foundation mainly ...

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Problems solved by technology

Among them, the "big excavation" slab foundation mainly relies on expanding the size of the foundation floor to meet the uplift stability, which is expensive and causes great damage to the environment; the excavation foundation is composed of undisturbed soil and the self-weight of the foundation to resist uplift The load, whose upright column engineering volume accounts for more than 60% of the foundation engineering volume, contributes less than 20% to the uplift bearing capacity, and the base unit volume bearing capacity is low; Provided, the index is better than that of the excavated foundation, but the depth-to-diameter ratio of the foundation must be kept above 4, and the buried depth is generally more than 5 meters, so the construction is difficult

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