Large transmission tower suction type barrel-shaped foundation structure and construction method

Abstract

The invention discloses a large transmission tower suction type barrel-shaped foundation structure and a construction method. The structure comprises at least one suction type barrel-shaped foundation sunk in a river network swamp foundation by using vacuum negative pressure in a barrel, wherein a barrel top platform is cast at the upper part of the suction type barrel-shaped foundation; a flange plate is embedded on the upper surface of the barrel top platform; and at least one connecting end bottom flange at the lower part of a transmission tower and the flange plate are connected through a bolt to form a whole. The construction method comprises the following steps: a) the prefabricated suction type barrel-shaped foundation is carried to the scene to form a sealed barrel-shaped structure; b) after the installation is finished, such lifting equipment as a crane is used for lifting the suction type barrel-shaped foundation to a designed tower position on an appointed soft soil layer; and a suction barrel sinks by a certain depth under the condition of self weight beforehand; c) water and air in the barrel are sucked out from an exhaust hole in the upper part of a cover of the suction barrel by exhaust vacuum equipment, and negative pressure is formed in the barrel; and d) after the barrel foundation reaches a preset elevation, the negative pressure in the barrel is released to finish the construction of the barrel foundation.

Description

technical field [0001] The invention relates to a suction barrel-shaped foundation structure and a construction method suitable for large-scale power transmission towers in river network soft soil areas, and belongs to the technical field of power transmission tower foundation structures. Background technique [0002] With the development of ultra-high voltage and ultra-high voltage transmission lines, the foundation load of iron towers is increasing. At the same time, the number of towers in deep and weak foundation areas such as river network swamps and water is also increasing. posed great challenges. Traditional large cast-in-situ piles, prefabricated piles and other pile foundations have high cost, and at the same time, the pile foundation construction equipment is relatively large, it is difficult to enter the site in the swamp area of ​​the river network, the construction process is complex and complicated, and the construction period is long. The fast and low-cost n...

AI Technical Summary

Problems solved by technology

Traditional large cast-in-situ piles, prefabricated piles and other pile foundations have high cost, and at the same time, the pile foundation construction equipment is relatively large, it is difficult to enter the site in the swamp area of ​​the river network, the construction process is complex and complicated, and the construction period is long. The fast and low-cost new type of foundation is very necessary for transmission lines in deep soft soil areas such as rivers, swamps, etc.

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