Single-anchor cable-slab foundation and construction method for transmission tower

Abstract

The invention discloses a single-anchor-cable-plate type foundation for a power transmission tower. The single-anchor-cable-plate type foundation for the power transmission tower comprises a bearing plate, an anchor eye, a pre-stressed anchor cable and concrete filled in the anchor eye. The pre-stressed anchor cable comprises a steel strand, a stretching and retracting anchor, a steel tube sleeve and steel cables. The stretching and retracting anchor comprises an upper connection plate, a lower connection plate, a spring connected with the upper connection plate and the lower connection plate and at least two connection rod assemblies symmetrically arranged on the two sides of the upper connection rod. The single-anchor-cable-plate type foundation for the power transmission tower resists vertically downward pressure, horizontal force and upward pulling force of the power transmission tower through the bearing plate and the pre-stressed anchor cable, the size of the anchor eye is reduced, the excavation amount of undisturbed soil and the spoil amount are reduced, the damage caused by large-area excavation to the environment is reduced, and therefore the ecological environment is protected. The invention further provides a construction method of the single-anchor-cable-plate type foundation for the power transmission tower. By the adoption of the construction method, during construction, the mechanical degree is high, the construction period is short, the construction efficiency is improved, and the construction cost is lowered.

Description

technical field [0001] The invention belongs to the field of transmission tower foundations, in particular to a single-anchor cable-slab foundation for transmission towers. Background technique [0002] At present, in areas with thick overburden, traditional transmission line foundations are mainly used, such as "big excavation", "excavation and bottom expansion", "cast-in-situ piles" and other foundations, but these traditional foundations have defects, and large excavation The excavation area of ​​the foundation is large and occupies a lot of land; the construction of the excavated foundation is relatively difficult; the cost of the cast-in-situ pile foundation is relatively high. [0003] The underground part of the traditional foundation occupies a large space. When there are high constraints on the occupied space of the underground part of the foundation, due to the limitation of the calculation model of the conventional slab foundation, the area of ​​the large undergro...

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Problems solved by technology

[0002] At present, in areas with thick overburden, traditional transmission line foundations are mainly used, such as "big excavation", "excavation and bottom expansion", "cast-in-situ piles" and other foundations, but these traditional foundations have defects, and large excavation The excavation area of ​​the foundation is large and occupies a lot of land; the construction of the excavated foundation is relatively difficult; the cost of the cast-in-situ pile foundation is relatively high

[0003] The underground part of the traditional foundation occupies a large space. When there are high constraints on the occupied space of the underground part of the foundation, due to the limitation of the calculation model of the conventional slab foundation, the area of ​​the large underground slab is often large, and it is easy to fail to meet the application conditions; Although the cast-in-situ pile foundation covers a much smaller area, for areas with high environmental requirements or inconvenient transportation, when using cast-in-place pile foundations, due to the limitation of construction technology, there are certain requirements for the site and transportation conditions, often due to inability to quickly Environmental pollution caused by a good solution

[0004] The traditional foundation mainly relies on the whole foundation to resist the uplift force, downward pressure and horizontal force, but when resisting a certain control load, the local part of the traditional foundation is often not stressed or the force is small, resulting in waste of materials, increasing the cost of the foundation, and making The cost of traditional foundation is higher

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