适用于采动影响区的新型可调式钢管桁架设计研究

Research on Design of New Adjustable Steel Pipe Truss Suitable for Mining-affected Areas

摘要:

随着大量输电线路工程的建设，线路途径采动影响区的比例日益增高。在开采活动的影响下，输电铁塔塔基处地表可能产生移动和变形，造成基础倾斜、杆塔变形等危害。中空防护大板基础已成功应用于特高压直流线路采动影响区，取得了良好的效果和工程应用经验，但其适应地形能力差、开方量巨大、水土流失严重。结合钢构件和长短腿的设计经验，提出将刚性隔面上移、隔面以下设置新型可调式钢管桁架的连接方式，代替中空防护大板基础，从而有效提高铁塔抵抗地表变形的能力和铁塔对地形的适应能力

Abstract:

With the construction of a large number of transmission line projects, the proportion of mining-affected areas along the line is increasing day by day. Under the influence of mining activities, the ground surface at the foundation of transmission tower may move and deform, resulting in foundation tilt, tower deformation and other hazards. The hollow protective slab foundation has been successfully applied in miningaffected areas of UHVDC transmission lines, and has achieved good results and engineering application experiences. However, it has a poor adaptability to terrain, huge excavation volume and[JP] serious soil and water loss. Combined with the design experiences of steel members and long and short legs, a connection mode is proposed to move the rigid partition upward and set a new type of adjustable steel pipe truss below the partition surface so as to replace the hollow protective plate foundation, which can effectively improve the towers′ ability to withstand surface deformation and to adapt to the terrain.