Pole and tower foundation construction method

Abstract

The invention provides a pole and tower foundation construction method. The pole and tower foundation construction method comprises the following specific steps that 1, a foundation pit is excavated, specifically, the periphery of the foundation pit is not sloped, and an operation margin is not reserved; 2, formworks are supported, specifically, a natural pit wall is used as a foundation formwork, a cylinder formwork is supported, and a step formwork is supported when steps exist; 3, reinforcing steel bars are bound, specifically, cylinder reinforcing steel bars are mounted according to design requirements, and the reinforcing steel bars at the four corners of a cylinder are inserted into the position 8-20 cm deep in the ground; 4, steel meshes are bound, specifically, the steel meshes are arranged along the reinforcing steel bars on the periphery of the cylinder and cover the foundation portion in height, and the steel meshes are bound to the reinforcing steel bars; and 5, pouring is conducted, specifically, the foundation portion adopts a full irrigation mode, and the interior and exterior of the cylinder are poured in a balanced mode. The periphery of the foundation pit is not sloped, the operation margin is not reserved, the earthwork volume is reduced by 10% or above, and eight man-hours or above can be saved.

Description

technical field [0001] The invention relates to a method for improving the construction time efficiency of tower foundations of overhead transmission lines, and belongs to the technical field of power system design and construction. Background technique [0002] At present, the main basic types of overhead transmission line engineering are described as follows: [0003] (1) Straight column stepped foundation [0004] This type of foundation adopts vertical main columns, and the bottom plate is plain concrete. The construction process is simple and the quality is easy to ensure. However, the amount of concrete used in this type of foundation is large and the cost is high. [0005] (2) Straight column slab foundation [0006] This type of foundation adopts vertical main columns and reinforced concrete bottom slabs, which makes full use of the gravity of the foundation and the overlying soil. The comprehensive cost is lower than that of ordinary concrete stepped foundations. ...

AI Technical Summary

Problems solved by technology

[0022] In the past, taking the straight column stepped foundation as an example, when the foundation was excavated in the foundation pit, there should be an operating margin around the bottom of the foundation pit to facilitate mechanical excavation and manual operation of the formwork, such as figure 1 , Disadvantages: First, the foundation floor is not in direct contact with the pit wall, and there is no friction between the foundation and the pit wall; second, the excavation volume of the foundation pit is large, and overflowing concrete will affect the demolition of the formwork, resulting in a long construction period , high cost

[0023] In the past, taking the straight column stepped foundation as an example, when the foundation was poured, due to the requirements of the design, the concrete pouring of the foundation floor, several steps and columns must be poured at one time; and in the pouring, the design unit often required the use of ready-made concrete (especially concrete pump trucks), to ensure the concrete label; but its fluidity is relatively large, and it is easy to cause the bottom plate to protrude after pouring the concrete around the connection between the bottom plate and the column. First, waste concrete, and second, excess concrete overflows into the Outside the side formwork of the bottom plate, it is difficult to remove the formwork, so that the turnover materials (formwork and steel pipes) cannot be removed

Therefore, the original method was to wait for about half an hour after pouring the bottom slab, and then pour the column after the concrete solidified slightly, prolonging the pouring time

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