Method for calculating specification of eight-anchor-bolt rigid tower base plate for power transmission tower

Abstract

The method discloses a method for calculating a specification of an eight-anchor-bolt rigid tower base plate for a power transmission tower. The method comprises: firstly, calculating a down force applied to the rigid tower base plate and an uplifting force applied to each anchor bolt so as to obtain the diameter of each anchor bolt, then calculating the minimum width of the rigid tower base plate, and calculating the minimum thickness required by pressure application and a minimum thickness required by pulling force application. According to the method, by using infinite element analysis and by means of infinite element analysis software, data is fitted; a concept of equivalent force arm computation is introduced, the influence of a base plate on a geometric force arm is considered, and subtraction is performed on the geometric force arm, so that the bearing capability of the tower base plate is reflected truely; the extreme bearing capability, calculated by the method, of the rigid tower base plates with the same specification is greater than a calculation numerical value in the (technical specification) and is smaller than an experimental value; and while the method overcomes the defects of the (technical specification), the calculation result is more reasonable and more reliable.

Description

technical field [0001] The invention relates to the construction of a power transmission iron tower, more specifically a method for calculating the specifications of a rigid tower seat plate with eight anchor bolts for a power transmission iron tower. Background technique [0002] The tower seat plate is an important component connecting the tower leg and the foundation of the self-supporting angle steel tower of the transmission line, and is responsible for transmitting the foundation force of the tower to the foundation. Such as figure 1 The rigid tower seat slab shown is divided into 16 cells by the stiffening plates arranged in a well-shaped pattern and the shoe plates arranged in a cross shape. Except for the four cells at the four corners, the remaining 12 cells are all squares with a side length of 2S. Anchor bolts are also arranged in the centers of eight of the grids. [0003] The foundation force of the transmission iron tower pole is divided into two types: down...

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Problems solved by technology

[0005] With the continuous development of UHV transmission lines, the load borne by pole towers is also increasing. The four-anchor bolt tower seat plate commonly used in ordinary line projects in the past can no longer meet the needs of UHV line projects. Therefore, more Eight anchor bolt tower seat plate type is used

[0006] After reviewing relevant domestic and foreign documents, regulations and specifications, only the "Technical Regulations for the Design of Tower Structures for Overhead Transmission Lines" DL / T5154-2012 (hereinafter referred to as "Technical Regulations") mentions the calculation method of the rigid tower seat plate with eight anchor bolts , but both calculation methods have the following disadvantages: (1) Rigid plate algorithm 1 (calculated according to three sides fixed and one side free and uniform force) and algorithm 2 (according to "Technical Regulations" formula 7.5.1-7 ~ formula 7.5.1 -9 for calculation) is only related to the base plate thickness of the tower base plate, without considering the effect of the cell width of the base plate (the distance between adjacent stiffening plates), that is, when the arrangement of the stiffening plates on the base plate remains unchanged, the cell width Infinitely increasing, the calculated bottom plate thickness remains unchanged, and the calculation results are inconsistent with the actual situation; (2) In the "Technical Regulations", it is assumed that the bottom plate stress is evenly distributed when the rigid plate is under tension. , the stress distribution of the bottom plate is seriously non-uniform, so the calculation method assumption in the "Technical Regulations" does not match the actual situation

[0008] At present, due to the high cost and time-consuming of true-type testing, the finite element method is often used to analyze the force of complex structures on the basis of experiments and theoretical analysis. The finite element method divides the continuous structure into several finite Overlapping cells, solving correlation functions numerically

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