1 General Provisions
1.0.1 This code is formulated with view to strengthening quality management of engineering construction of 110kV~750kV overhead transmission line, standardizing quality control and acceptance condition of construction process and ensuring engineering quality.
1.0.2 This code is applicable to construction and acceptance of new construction, extension and renovation of AC overhead transmission line with voltage grade of 110kV~750kV.
1.0.3 Construction of overhead transmission line engineering shall be carried out according to the design document approved and subjected to joint review; in case it is necessary to change the design, it shall be confirmed by the original design organization.
1.0.4 Prior to construction of overhead transmission line engineering, there shall be such technical documents as examined and approved construction organization design document and matched construction scheme.
1.0.5 New technology, new process, new procedure, new equipment and new material shall be subjected to test, testing and verification at test point and can only be used after they are judged as meeting the requirements of this code.
1.0.6 Instrument, apparatus and measuring tools used for overhead transmission line engineering measurement and inspection shall be verified, qualified and within validity period of verification.
1.0.7 Construction and acceptance of 110kV~750kV overhead transmission line shall comply with those specified in this code and the current relevant ones of the nation.
2 Terms
2.0.1
satellite positioning measure
method determining the relative position of ground point by receiving the signal of multiple position location satellites with two or more receivers at the same time
2.0.2
PDOP
intuitively calculating and displaying the geometrically distribution conditions of the observed satellite with the position dilution of precision of satellite positioning measure
2.0.3
ground clearance
minimum distance between any alive part and ground under specified conditions
2.0.4
water-cementations material ratio
mass ratio of mixing water (excluding water absorbed by aggregate) in cement concrete or mortar to cementitious material.
2.0.5
permafrost
soil layer keeping frozen for two or more years, also referred to as perpetually frozen soil
2.0.6
hot stick
a kind of high-efficient heat-conducting device made of seamless carbon steel pipe with unique unidirectional heat transfer performance: heat can only be transferred from lower end of ground surface to upper end of ground surface
2.0.7
low ohm earthing device
earthing unit with certain shape which is prefabricated by low resistant materials
3 Test of Raw Materials and Equipment
3.0.1 Raw materials and equipment used in the project shall meet the following requirements:
1 Possess end-of-manufacturing quality inspection certificate for this batch of products;
2 Possess various quality inspection data complying with current standards of the nation;
3 As for raw materials like sand, stone etc. without quality inspection data, they shall be sampled and inspected by organization with inspection qualification and may only be used after being regarded as acceptable;
4 In case of suspicious inspection results of product, they shall be sampled and inspected again by organization with inspection qualification and may only be used after being regarded as acceptable;
3.0.2 If new raw materials and equipment are adopted, they shall pass the test and technical appraisal carried out by specialized departments and may only be used after being certified to meet the design quality requirements and relevant standards.
3.0.3 As for raw materials and equipment, in any of the following cases, they shall be re-inspected, and whether they are to be used or used by degradation shall be determined according to inspection results:
1 Retention period is exceeded;
2 Possibly deteriorate due to faulty storage;
3 Sample is taken not according to those specified in the standard or the specimen is not representative.
3.0.4 Crushed stone and pebble used in the project shall meet the requirements of the current national standard GB/T 14685 Pebble and Crushed Stone for Construction. Crushed stone and pebble used for precast concrete member, cast-in-site concrete foundation and protection facilities shall also meet the relevant requirements of the current professional standard JGJ 52 Standard for Technical Requirements and Test Method of Sand and Crushed Stone (or Gravel) for Ordinary Concrete.
Contents
Foreword ii
1 General Provisions
2 Terms
3 Test of Raw Materials and Equipment
4 Measure
5 Earthwork Engineering
6 Foundation Engineering
6.1 General Requirement
6.2 Depositing Concrete on-site Foundation
6.3 Pouring Pile Concrete Foundation
6.4 Foundation for Concrete Pole and Precast Concrete Foundation
6.5 Rock Foundation
6.6 Winter, High-temperature and Raining Season Construction
6.7 Foundation Construction in Permafrost Regions
7 Towers and Poles Erection
7.1 General Requirements
7.2 Iron Towers
7.3 Concrete Poles
7.4 Steel Tube Poles
7.5 Guy
8 Erection and Stringing Lines Engineering
8.1 General Requirements
8.2 Tension Stringing
8.3 Non-tension Stringing
8.4 Connection
8.5 Stringing
8.6 Accessories Installation
8.7 Erection and Stringing of Overhead Ground Wire Optical Fiber Composite (OPGW)
9 Earthing Connection Engineering
10 Engineering Acceptance and Data Delivery
10.1 Engineering Acceptance
10.2 Completion Test
10.3 Completion Delivery
Annex A Requirements for the Safety Distance
Explanation of Wording in This Code
List of Quoted Standards
