Foundation structure of steel tower

Abstract

To provide a foundation structure of a tower capable of reducing labor load, construction cost, and production steps by reducing the scale of the structure of a foundation and facilitating construction. This foundation structure of the tower for supporting the main pedestals (4) of the tower comprises main piles (1) installed in the ground along directions roughly matching the directions of the main pedestals (4), auxiliary piles (2) installed in the ground along surface directions connecting the foundations to the center of the tower in plan view, and joining structures (3) joining the main piles (1) to the auxiliary piles (2) and to which the base parts of the main pedestals (4) are fixed. The joining structures (3) are built, for example, by placing a concrete (7) in a steel pipe (6). The top parts of the main piles (1) are joined to the lower surfaces of the joining structures (3), and the top parts of the auxiliary piles (2) are joined to the side faces thereof.

Description

technical field [0001] The present invention relates to a foundation structure of an iron tower for supporting main piles of the iron tower. Background technique [0002] Especially as the foundation structure of a power supply tower in a mountainous area, when the supporting layer is shallow, an inverted T-shaped foundation 50 as shown in FIG. Mainly adopt the deep foundation 51 as shown in FIG. 25 . [0003] On the other hand, the foundation of the above-mentioned power supply tower is more strongly affected by the pay-out tension of the wire and wind load such as typhoon or monsoon than the influence of the tower's own weight or the wire's own weight. As a result, the overturning moment becomes large compared to all the compressive loads due to other factors, so that a compressive load acts on the tower foot on the leeward side, and approximately equal to the compressive load acts on the tower foot on the windward side. 70% of the pull-out load (pull-out force) of the l...

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Problems solved by technology

[0009] In addition, when the bedrock is near the ground surface and it is difficult to excavate with heavy machinery, it is necessary to use blasting together, or it is necessary to assemble the soil retaining bracket mainly by manpower, which will increase the labor load and prolong the construction period. question

[0010] On the other hand, in the foundation (footing) supporting the foot of the iron tower, as shown in FIG. A cone-shaped shear crack 54 centered at the base of the

And, as shown in FIG. 27, when the pile body 55 is too close to the outer edge of the footing 53, shear cracks 56, 56... in the form of split cracks are generated from the fixed part to the outside, and the fixed part is destroyed.

In addition, when the footing is too thin, as shown in the figure, there will be problems such as a cone-shaped shear crack 54 centered on the pile body 55.

[0011] Therefore, if the footing 53 is designed to have sufficient resistance to these press-fit force, pull-out force, bending moment, and horizontal force without causing cracks, the scale of the footing becomes large, and also increases with the scale of the footing. Correspondingly, there are problems such as increased excavation volume and concrete pouring volume, and construction requires a lot of time and labor

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