GB 50233: Evolution and historical versions
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| GB 50233-2014 | English | 305 |
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Code for construction and acceptance of 110kV～750kV overhead transmission line
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GB 50233-2014
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| GB 50233-2005 | English | RFQ |
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Code for construction and acceptance of 110～500kV overhead transmission line
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GB 50233-2005
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PDF similar to GB 50233-2014
Basic data | Standard ID | GB 50233-2014 (GB50233-2014) | | Description (Translated English) | Code for construction and acceptance of 110kV��750kV overhead transmission line | | Sector / Industry | National Standard | | Classification of Chinese Standard | P62 | | Classification of International Standard | 29.240 | | Word Count Estimation | 92,957 | | Date of Issue | 10/9/2014 | | Date of Implementation | 8/1/2015 | | Older Standard (superseded by this standard) | GB 50389-2006; GB 50233-2005 | | Quoted Standard | GB 50025; GB 50026; GB 50119; GB 50169; GB 50201; GB 50204; GB 50328; GB 50496; GB 50661; GB 50666; GB 175; GB/T 1001.1; GB/T 1179; GB 1499.1; GB 1499.2; GB/T 2314; GB/T 2317.4; GB 2337; GB/T 2694; GB/T 4623; GB/T 7253; GB 8076; GB/T 11822; GB/T 14684; GB | | Regulation (derived from) | People's Republic of China Housing and Urban-Rural Development Ministry Bulletin No. 581 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This Standard applies to the voltage rating of construction and acceptance of 110kV ~ 750kV AC overhead transmission lines new construction, renovation and expansion project. | GB 50233-2014: Code for construction and acceptance of 110kV～750kV overhead transmission line---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to strengthen the management of the construction quality of 110kV ~ 750kV overhead transmission line project, standardize the quality control and acceptance conditions of the construction process, and ensure the quality of the project, this specification is formulated.
1.0.2 This specification is applicable to the construction and acceptance of new construction, reconstruction and expansion projects of AC overhead transmission lines with a voltage level of 110kV ~ 750kV.
1.0.3 The overhead transmission line project shall be constructed in accordance with the approved and jointly reviewed design documents. When it is necessary to change the design, it shall be confirmed by the original design unit.
1.0.4 Before the construction of the overhead transmission line project, there should be technical documents such as the approved construction organization design documents and supporting construction plans.
1.0.5 The adoption of new technology, new process, new process, new equipment and new material shall be adopted only after testing, testing and pilot verification, and it is judged to meet the requirements of this specification.
1.0.6 The instruments, gauges, measuring tools, etc. used for the survey and inspection of overhead transmission line engineering shall pass the verification and be used within the validity period of the verification.
1.0.7 The construction and acceptance of 110kV ~ 750kV overhead transmission lines shall not only comply with the provisions of this specification, but also comply with the relevant current national standards.
2 terms
2.0.1 satellite positioning measure
Using two or more receivers to simultaneously receive signals from multiple positioning satellites to determine the relative position of ground points.
2.0.2 Satellite positioning PDOP
Through the spatial position precision factor of satellite positioning measurement, it can intuitively calculate and display the geometric distribution of the observed satellites.
2.0.3 Ground clearance
Under specified conditions, the minimum distance between any live part and earth.
2.0.4 Water-cementations material ratio
The mass ratio of mixing water (excluding water absorbed by aggregate) to cementitious material in cement concrete or mortar.
2.0.5 Permafrost permafrost
The soil layer that has been frozen for 2 years or more is also called permafrost.
2.0.6 Hot stick hot stick
A high-efficiency heat conduction device made of carbon seamless steel pipe has a unique one-way heat transfer performance. heat can only be transferred from the lower end of the ground to the upper end of the ground, and heat cannot be transferred in the opposite direction.
2.0.7 Low ohm earthing device
A fixed-shape ground unit prefabricated from low-resistance material.
3 Inspection of raw materials and equipment
3.0.1 The raw materials and equipment used in the project shall meet the following requirements.
1 There should be a quality inspection certificate for this batch of products;
2 There should be various quality inspection materials that meet the current national standards;
3 Raw materials without quality inspection data such as sand and stone should be sampled and inspected by a unit with inspection qualifications, and can only be used after passing the test;
4 When there is any doubt about the product inspection results, re-sampling shall be carried out according to the regulations and shall be inspected by a unit with inspection qualifications.
3.0.2 When using new raw materials and equipment, they should pass the test and pass the technical appraisal of the professional department to prove that their quality meets the design requirements and relevant standards before they can be used.
3.0.3 When the raw materials and equipment meet any of the following conditions, they should be re-inspected, and it should be determined whether to use or downgrade according to the inspection results.
1 The storage period exceeds the stipulated ones;
2 Those that may deteriorate due to poor storage;
3 The samples are not taken according to the standard or the samples are not representative.
3.0.4 The crushed stones and pebbles used in the project shall comply with the relevant provisions of the current national standard "Pebbles and Crushed Stones for Construction" GB/T 14685.The crushed stones and pebbles used for prefabricated concrete components, cast-in-place concrete foundations and protective facilities should still meet the relevant provisions of the current industry standard "Sand and Stone Quality and Inspection Method Standards for Ordinary Concrete" JGJ 52.
3.0.5 The sand used in the project shall meet the following requirements.
1 It should meet the relevant provisions of the current national standard "Sand for Construction" GB/T 14684.The sand used for prefabricated concrete components, cast-in-place concrete foundations and protective facilities shall comply with the relevant provisions of JGJ 52, the current industry standard "Sand and Stone Quality and Inspection Method Standards for Ordinary Concrete".
2 Do not use sea sand.
3.0.6 The cement used in the project shall meet the following requirements.
4.0.4 Total station or satellite positioning should be used for the re-measurement of the span. The coordinate values provided by the design should be used for inspection or verification during the measurement, and the distance between the center pile of the tower position and the front and rear direction piles should not be less than 100m.
4.0.5 Before the measurement of the sub-pit, the center pile of the given pole tower position should be reviewed according to the data provided by the design, and it should be used as the benchmark for measurement.
4.0.6 If one of the following situations occurs in the retest, the cause shall be found out and corrected.
1 Based on two adjacent linear piles, the deviation of the horizontal line direction is greater than 50mm;
2 The deviation of the distance between the center piles or straight piles at the pole tower position relative to the design value is greater than 1%;
3 For the angle value of the corner pile, the deviation from the design value is greater than 1′30″ when retested by the direction method;
4 The displacement of the center pile of the corner tower does not meet the design requirements;
5 The tower base section does not match the design file.
4.0.7 During the measurement, it is important to review the elevation of the raised point of the terrain where the distance between the wire and the ground (including wind deflection) may not be enough, the elevation of the objects to be spanned between towers and the relative height difference between adjacent towers. The deviation between the measured value and the design value should not exceed 0.5m, and if it exceeds, the reason should be found out with the designer.
4.0.8 The central piles at the pole tower positions lost after the design of the piles should be supplemented according to the design data, and should meet the requirements of Article 4.0.6 of this code.
4.0.9 When the steel tape is used to measure the pile-moving pile at the center of the tower position, the difference between the two measured values shall not exceed 1‰ of the measuring distance.
4.0.10 When dividing the pit, auxiliary piles for quality control and construction measurement should be set according to the position of the center pile at the tower position. For the central piles at the tower positions that are not easy to keep during construction, auxiliary piles should be set around the foundation and the original records should be kept.
4.0.11 The safety distance and crossover requirements of the overhead transmission line after wiring shall meet the requirements of Appendix A of this code.
5 Earthworks
5.0.1 The earthwork construction and acceptance of transmission line engineering shall not only comply with the provisions of this specification, but also comply with the relevant provisions of the current national standard "Code for Construction and Acceptance of Earthwork and Blasting Engineering" GB 50201.When lime soil is used to treat the foundation of collapsible loess, the quality of construction and acceptance shall comply with the relevant provisions of the current national standard "Code for Buildings in Collapsible Loess Areas" GB 50025.
5.0.2 The earthwork construction shall meet the design requirements, reduce the damage to the ground other than excavation, and reasonably select the dumping point of the spoil. The excavation of the construction base of the tower foundation shall be based on the design drawings, and the excavation slope shall be determined according to different geological conditions. After the base surface is excavated, there should be no water accumulation, and the side slope should not collapse.
5.0.3 The excavation of weathered rock or relatively hard rock foundation pit can be combined with loose blasting and manual excavation, but the pit wall should be kept intact. Rock slag and turquoise should be removed.
5.0.4 When mechanical excavation is used to excavate the foundation pit, when the distance from the design depth is 300mm to 400mm, manual excavation should be used instead.
5.0.5 After foundation pit excavation and groove inspection, if the geological conditions are inconsistent with the design documents, it should be referred to the design for processing.
5.0.6 The pit depth of the tower foundation shall be based on the design and construction base. The pit depth of the guyed foundation shall be based on the ground level at the center of the guyed foundation.
6.1.9 The allowable deviation of the foundation size of the whole foundation tower shall comply with the provisions in Table 6.1.9.
Table 6.1.9 Allowable Deviation of Foundation Dimensions for Integral Towers
Note. 1 The horizontal line of the corner tower foundation refers to the direction of the bisector of the inner angle, and the direction along the line refers to the direction of the bisector of the corner.
2 Foundation root opening and diagonals refer to the horizontal distance between the centers of the same group of anchor bolts or between the main steel alignments of the tower legs.
3 The relative height difference refers to the relative height difference after the plastering of the anchor bolt foundation or the relative height difference of the leveling mark of the plug-in foundation.
4 The elevation difference of the foundation top surface of the high and low legs is compared with the design elevation.
5 High tower refers to the iron tower with a tower height of more than 100m designed according to the large span.
6 The allowable deviation of the inclination rate of the main steel (steel pipe) of the plug-in foundation is 3% of the design value.
6.1.10 The foundation concrete strength should be based on the test block strength. The strength of the test block shall meet the design requirements.
6.1.11 After the foundation construction is completed, measures should be taken to protect the finished foundation.
6.1.12 The foundation anticorrosion should be carried out according to the design regulations.
6.2 Cast-in-place foundation
6.2.1 The formwork should be supported before the foundation is poured on site, the formwork should be made of rigid materials and the support should be reliable, the surface should be flat and the joints should be tight. Effective demoulding measures should be taken on the surface of the formwork that contacts the concrete.
6.2.2 When pouring concrete, measures should be taken to prevent soil and other sundries from mixing into the concrete.
6.2.3 Before installation, the anchor bolts in the cast-in-place foundation shall be free of floating rust, and the threaded part shall be protected. The anchor bolts and embedded parts should be installed firmly, and the accuracy of the position should be checked at any time during the pouring process.
6.2.4 The main steel (steel pipe) of the plug-in foundation should be aligned and fixed firmly, and the accuracy of its position should be checked during the pouring process.
6.2.5 Mechanical stirring and mechanical tamping shall be adopted for the vibration and tamping of concrete poured on site. Special quality assurance measures shall be taken when mechanical stirring and tamping are not possible for special terrains. When the concrete blanking height exceeds 3m, chute or string tube blanking should be used.
6.2.6 The water-binder ratio should be strictly controlled during the concrete pouring process. Concrete slump should be checked at least twice per shift day or each foundation leg.
6.2.7 For each shift day or each foundation, the amount of concrete mix ratio materials should be checked at least twice against the concrete mix ratio design.
6.2.8 Ready-mixed concrete can be used when traffic and on-site supply conditions are available. Ready-mixed concrete should be transported by concrete mixer truck.
6.2.9 The delivery frequency of concrete shall ensure the continuity of concrete pouring, and the initial setting time of concrete shall not be exceeded when pouring begins.
6.2.10 The temperature of the concrete mixture entering the mold should not be lower than 5°C and should not be higher than 35°C.
6.2.11 When the underground water level of the foundation pit is high or the water seepage is too large, effective measures such as site water interception, precipitation or underwater concrete pouring shall be taken.
6.2.12 The test block shall be made by random sampling during the pouring process on site, and standard curing shall be adopted. When there are special needs, the same condition curing test block should be added.
6.2.13 The quantity of test blocks shall meet the following requirements.
1 One group shall be taken for each foundation of the tension tower and the overhanging corner tower;
2.For the suspension vertical line tower foundation of the general line, the same construction team shall take one group for every 5 foundations or less than 5 foundations, and one group shall also be taken when the amount of concrete poured for a single foundation or continuous pouring exceeds 100m3;
3 For straight tower foundations and guyed foundations designed according to large spans, one set should be taken for each leg, but when the amount of foundation concrete does not exceed the foundation of large corners or terminal towers in the same project, one set should be taken for each foundation;
4 When the raw material changes and the mixing ratio changes, another test block should be made.
6.2.14 Concrete strength tests shall be conducted by units with corresponding qualifications.
6.2.15 The maintenance of cast-in-place concrete shall comply with the following regulations.
1.Start watering and curing within 12 hours after the final setting. When the weather is hot, dry and windy, start watering and curing within 3 hours. Covers should be added outside the foundation formwork during curing. The number of watering should be able to keep the concrete surface always wet;
2 The watering and curing time for exposed concrete should not be less than 5 days and nights, and the maintenance of large-volume concrete foundations for transmission lines should also comply with the current relevant national standards;
3 After the formwork removal of the foundation has passed the surface quality inspection, it should be backfilled in time, and the exposed part of the foundation should be covered, and watering and maintenance should be continued according to the specified period. During maintenance, the covering and the concrete around the foundation should always be kept moist;
4 When using a curing agent for curing, it should be removed after the mold is removed and the surface inspection is done...
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