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一、概述随着大容量、超高电压的送电线路的出现,对铁塔基础强度的要求也越来越高。在铁塔基础中上拔力和下压力同时存在。对于上拔荷载,国内外从60年代初期曾以土力学的概念进行探讨,至今一致认为尽量利用原状土的抗拔强度是今后建设的方向。钻孔灌注桩能达到这一要求。但在送电线路上采用钻孔灌注桩有一定困难,主要是由于送电线路的特点所造成。因为送电线路分布面广,地质条件复杂,现场情况又多变。尽管在架空送电线路技术规程中已明确指出,在粘性土或砂性土中宜采用灌注桩基础,但在全线采用该技术并不多见,主要原因是没有一种适合送电线路铁塔基础所用的机具。同时,
I. Overview With the emergence of large-capacity, ultra-high-voltage power transmission lines, the requirements for the strength of the tower’s foundation have become higher and higher. In the foundation of the tower, pull-out force and downforce exist at the same time. For the uplifting load, the concepts of soil mechanics have been discussed at home and abroad from the early 1960s. It has been agreed that using the undisturbed strength of undisturbed soil as far as possible is the direction for future construction. Bored piles can meet this requirement. However, there are certain difficulties in using cast-in-situ piles on transmission lines, mainly due to the characteristics of transmission lines. Because of the wide distribution of transmission lines and the complex geological conditions, the situation on the site has changed. Although it has been clearly pointed out in the technical specifications for overhead transmission lines, the use of cast-in-place piles should be adopted in cohesive or sandy soils, but the adoption of this technology is not common in all lines. The main reason is that there is no foundation suitable for transmission line towers. The equipment used. Simultaneously,