Combined pile casing for power transmission tower foundation

Abstract

The invention relates to a combined pile casing for a power transmission tower foundation. The power transmission tower foundation comprises concrete foundation bodies and bearing platforms, wherein each bearing platform is arranged at the upper end of the corresponding concrete foundation body. The combined pile casing comprises an outer steel pile casing body and an inner steel combined pile casing body which is arranged in an inner chamber of the outer steel pile casing body in a sleeved manner. The upper end of each bearing platform is provided with a fixing assembly for fixing a power transmission tower. H-shaped pile casing connecting pieces for connecting the pile casing bodies are arranged between the outer steel pile casing body and the inner steel combined pile casing body in the direction perpendicular to the axis of the combined pile casing. The combined pile casing for constructing the power transmission tower foundation has the beneficial effects that the power transmission tower fixing requirement in a mollisol area can be met; and the combined pile casing is low in production cost, convenient to mount and firm.

Description

technical field [0001] The invention relates to a construction equipment, in particular to a combined casing used for the foundation of an electric tower. Background technique [0002] During the construction of the foundation of the transmission tower, when the drilled hole passes through the soft flow-plastic soil layer, the collapse hole, the infiltration of surface water into the foundation and the instability of the foundation pile often occur. Therefore, it is necessary to provide a combined casing for the foundation construction of the transmission tower to ensure The normal construction of the tower foundation is not affected by collapsed holes and unstable pile positions. [0003] The existing composite casing adopts direct lifting or vibrating hammer lifting. Such as figure 1 The direct lifting method shown is to use the lifting mechanical equipment to pull the casing out of the borehole along the axis of the drilling hole. Obviously, the lifting force must be gr...

AI Technical Summary

Problems solved by technology

like figure 1 The direct lifting method shown is to use the lifting mechanical equipment to pull the casing out of the borehole along the axis of the drilling hole. Obviously, the lifting force must be greater than the outer frictional resistance of the casing. The problems of this method include: 1) The lifting force is large, Therefore, large-scale hoisting and lifting machinery or special special equipment are required; 2) The lifting machinery or equipment has a large downward pressure on the ground surface, so the risk of surface subsidence increases and even affects the stability of the borehole wall; 3) Pile foundation construction for special projects such as power transmission lines The conditions are harsh, large-scale equipment is limited and cannot enter the site, and it is difficult to complete the promotion work

The problems of this method are: 1) it has good applicability to non-cohesive soil with high water content, but it has poor effect on soil layers with other conditions; 2) it will cause noise pollution to the surrounding environment; 3) the drag reduction and lifting effect of vibratory hammer is not good. Ideally, there will be various problems encountered in direct promotion as listed above

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