IEEE 951 1997

$61.75

IEEE Guide to the Assembly and Erection of Metal Transmission Structures

Published By	Publication Date	Number of Pages
IEEE	1997	44

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Description

Revision Standard – Active. Various good practices that will enable users to improve their ability to assemble and erect self-supporting and guyed steel or aluminum lattice and tubular steel structures are presented. Construction considerations after foundation installation, and up to the conductor stringing operation, are also covered. The guide focuses on the design and construction considerations for material delivery, assembly and erection of metal transmission structures, and the installation of insulators and hardware. This guide is intended to be used as a reference source for parties involved in the ownership, design, and construction of transmission structures.

PDF Catalog

PDF Pages	PDF Title
1	Tile Page
3	Introduction Participants
5	CONTENTS
7	1. Overview 1.1 Scope 1.2 Purpose 1.3 Application
8	1.4 Safety 1.5 Legal disclaimer 2. References 3. Definitions
9	4. Project planning 5. Structure design considerations 5.1 Construction and maintenance loads
10	a) Partially assembled lattice structure sections will be subjected to dead-weight loads, dynamic… b) Members on which one or more workers are expected to climb or stand should be designed for a m… Figure 1— Portions of a structure subjected to additional loads due to one or more workers c) Portions of a structure may be subjected to additional loads while they support one or more wo… d) If fall arrest systems are required, attachment points should be designed for the anticipated … e) Rigging attachment points should be provided for lifting the structure, hoisting insulators an…
11	5.2 Material delivery 5.3 Constructability of structures a) Each member should be clearly and permanently marked by stamping or welding. This mark should … 1) General location of the member in the structure by using a logical numbering sequence 2) Structure type 3) Special material types b) The structure should be designed with a minimal assortment of bolt diameters and types. c) Adequate clearance around nuts and bolt heads for wrenches or sockets should be provided. d) For safety and ease of erection, a place for a worker to stand should be provided below each l… e) The bill of materials should provide an approximate finished (that is, galvanized or painted) … f) Legible erection drawings and data sheets for line sections should be provided. The drawings s… g) Fabrication tolerances that are either too restrictive or too liberal can result in increased … h) Consideration should be given to the method of locking fasteners. The method selected will inf… i) Designs should be checked for worker accessibility. Design of structures sometimes results in …
12	5.3.1 Constructability of lattice structures a) Where members are connected by one bolt at each end, the detailer should require a spud hole a… b) Depending on the method of erection, the location of leg and crossarm splices can affect the a… c) When tilting up structure sections diagonal braces extending below the main legs can be damage… Figure 5— Leg splice detail recommended for helicopter erection d) When butt splices are used on main structure legs, gin pole or crane assembly may be facilitat… e) When using lap splices, assembly and erection with crane and helicopter techniques are facilit… f) When helicopter erection is used, temporary stops are installed in both butt and lap splices. … g) Design internal structure leg bracing to facilitate its assembly and erection with each main s… h) In order to facilitate raising and lowering tools and equipment with handlines, it may be unsu…
13	Figure 2— Splice location recom mended for aerial erection Figure 6— Leg splice detail recommended for crane erection
14	Figure 7— Recommended butt splice detail Figure 8— Leg spice recommended for helicopter or crane erection Figure 9— Internal leg bracing detail 5.3.2 Constructability of tubular steel structures a) Avoid structural detailing requiring workers to insert tools or their hands between large memb… b) Provisions for lifting eyes or pick points to minimize damage to the finish of the pole. Posit… c) Provisions for the constructor to verify the lap joint distances and orientation as shown on t…
15	d) Provisions for climbing devices, working and belting-off may be desirable for construction and… e) Buoyancy of direct embedded steel poles should be considered. Details such as provisions for f… 5.4 Trial assembly Figure 10— Trial assembly of complex tubular structure 6. Material delivery 6.1 Introduction 6.2 Material yard
16	6.3 Receipt and inspection of material
17	6.4 Handling and storage of materials
19	6.5 Overages, shortages, and replacement material 6.6 Surplus material 7. Assembly and erection of lattice structures 7.1 Introduction
20	7.2 Foundation tolerances 7.3 Field assembly
22	7.4 General method of erection
23	7.5 Crane erection
25	7.6 Gin pole erection
27	7.7 Helicopter erection 8. Assembly and erection of tubular steel structures 8.1 Introduction
28	8.2 Handling and transportation of poles, arms, and component parts 8.3 Single pole structures
33	8.4 Framed structures
35	8.5 Attaching pole structures to various foundations
36	8.6 Helicopter methods (refer to Clause 9) 8.7 Post-erection
37	9. Helicopter methods of construction 9.1 Introduction 9.2 Economic considerations
39	9.3 Helicopter structure placement
42	10. Assembly and installation of insulators and hardware 10.1 Introduction 10.2 Assembly of insulators and hardware
43	10.3 Installation of cotter keys 10.4 Installation of assemblies
44	11. Quality assurance Annex A—Bibliography