Method for pile plate base for ultra-high voltage electric power line steel tower on soft foundation

Abstract

The invention discloses a pile board basic method of an ultra high voltage electric power pylon used on soft foundation, which comprises the following seven steps: first, constructing tree root pile; second, digging foundation ditch; third, chipping the tree root pile and then building inverted cone; fourth, constructing a base plate; fifth, constructing a base pillar; sixth, backfilling the foundation ditch; and seventh, installing a tower frame; the tree root pile is connected with the base plate through the inverted cone, the base plate is connected with the base pillar, and the top of the base pillar is provided with a stone bolt which is connected with the tower frame. The method has the advantages of convenient construction, simple operation, stable and firm foundation, reliable bearing capacity, small uneven settlement and low cost. The method provides a stable and reliable foundation model for an ultra high voltage electric power pylon built on soft foundation with relativelythick soft soil horizon but hard shell horizon with certain thickness, which has the advantages of effectively utilizing the bearing potential of the hard shell horizon, reducing the excavated volumeof earthwork, lowering the construction cost and construction difficulty, and needing no daily maintenance work.

Description

technical field [0001] The invention relates to the treatment of weak foundations in geotechnical engineering, in particular to a construction method for pile-slab foundations of ultra-high-voltage transmission line iron towers on soft foundations, which is suitable for ultra-thin superstructures where the thickness of the soft soil layer is less than 10m and the buried depth of the soft soil bottom layer is less than 13m. High voltage transmission line tower foundation. Background technique [0002] The design of the tower foundation of the ultra-high voltage transmission line occupies an extremely important position in the design of the ultra-high voltage transmission line. No matter which part of the foundation has problems or damage, it will have a bad impact on the upper tower and even cause major accidents. [0003] When constructing ultra-high voltage transmission towers on weak foundations, the choice of foundation type is one of the main factors affecting the overal...

AI Technical Summary

Problems solved by technology

At present, the foundation forms used for weak foundations mainly include: cast-in-place piles, large-slab foundations, and spiral-anchor foundations. Large-slab foundations are prone to uneven settlement, and generally need to install guy wires, which require frequent adjustments and occupy a lot of land, while spiral anchors use a large amount of steel, complex equipment, and limited reinforcement depth; on the other hand, the current foundation design method is not suitable for Insufficient utilization of the load-carrying capacity of the relatively hard crust

[0004] Aiming at the problems existing in the commonly used transmission line tower foundation, Yan Peiqin of the Southwest Electric Power Design Institute of the Ministry of Energy designed a "light optimized iron tower foundation" (patent No. 88218973.5), which reduces the amount of steel and concrete compared with the general foundation, but the essence of this foundation is It is still a large slab foundation, and it is difficult to adapt to the soft soil foundation

[0005] It can be seen from the above that the foundation type of ultra-high voltage transmission line towers commonly used in weak ground areas is not ideal

Therefore, it is very necessary to develop a new composite foundation to overcome the shortcomings of the existing foundation types such as high cost, uneven settlement of the foundation, and large amount of steel and concrete. Puzzle offers a new way

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