NB/T 31010-2019Quota for cost estimation of onshore wind power projects (English PDF)

Foreword

This document was issued on 4 June 2019 by the National Energy Administration of the PRC and takes effect on 1 October 2019.

It is a NB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 27.180, Chinese classification P 02.

It replaces NB/T 31010-2011, which is superseded.

This standard has been drafted in accordance with the rules given in GB/T 1.1-2009, Directives for standardization - Part 1: Structure and drafting of standards.

This standard replaces NB/T 31010-2011, Quota for cost estimation of onshore wind power projects. In addition to editorial modifications, the main technical changes of this standard with respect to NB/T 31010-2011 are as follows.

The field of application of the standard has been revised to read: the standard applies to the compilation of design cost estimates for newly built centralized onshore wind farm projects; for other onshore wind farm projects, the compilation of design cost estimates may be carried out with reference to this standard.

The labour grades of the quota have been revised to read senior skilled worker, skilled worker and general worker; the unit of measurement of labour in the quota has been revised to the work-day and the unit of measurement of machinery has been revised to the machine-shift.

The number of quota sub-items for equipment installation works has been adjusted from 491 to 461, of which 259 quota sub-items have been revised, 153 quota sub-items are new and 183 quota sub-items have been deleted.

Chapter 1 'Installation of wind turbine generator units, towers (frames) and foundation rings' has been revised into 5.1 'Installation of wind turbine generator units, towers (frames), foundation rings and prestressed anchor bolts', comprising 58 quota sub-items in total. Within it, the installation of wind turbine generator units has been supplemented with three installation methods using a crawler crane, a truck crane and a dedicated wheeled crane, amounting to 25 quota sub-items; the installation of towers (frames) has been supplemented with the same three installation methods using a crawler crane, a truck crane and a dedicated wheeled crane, amounting to 19 quota sub-items; the installation of foundation rings and prestressed anchor bolts has been supplemented with 1 new quota sub-item for the installation of prestressed anchor bolts; 13 quota sub-items have been revised and 26 quota sub-items have been deleted (see 5.1; 1.1, 1.2 and 1.3 of the 2011 edition).

In Chapter 2 'Transformer installation', 'installation of three-phase power transformers' has been supplemented with 1 new quota sub-item and 'installation of dry-type transformers' with 8 new quota sub-items; 'installation of reactors' has been added with 6 quota sub-items; 47 quota sub-items have been revised and 14 quota sub-items have been deleted (see 5.2; 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.3 and 2.4 of the 2011 edition).

In Chapter 3 'Installation of switchgear equipment', 'installation of circuit breakers' has been supplemented with 2 new quota sub-items, 'installation of disconnecting switches' with 6 new quota sub-items, 'installation of instrument transformers' with 2 new quota sub-items, 'installation of fuses' with 2 new quota sub-items and 'installation of complete high-voltage switchgear cabinets' with 2 new quota sub-items; 'installation of earthing transformers and complete earthing resistance devices' has been added with 1 quota sub-item; 'installation of entrance and exit bushings of gas-insulated combined switchgear (GIS)' has been added with 3 quota sub-items; 'installation of capacitors' has been supplemented with 2 new quota sub-items; 'installation of dynamic reactive power compensation devices' has been added with 5 quota sub-items; 76 quota sub-items have been revised and 15 quota sub-items have been deleted (see 5.3; 3.1 and 3.10 of the 2011 edition).

In Chapter 4 'Busbar and cable installation', 'busbar installation' has been supplemented with 2 new quota sub-items, 'cable laying' with 6 new quota sub-items, 'installation of cable terminations' with 4 new quota sub-items and 'cable fire protection' with 4 new quota sub-items; 41 quota sub-items have been revised and 29 quota sub-items have been deleted (see 5.4; 4.1, 4.4, 4.5, 4.6.5, 4.6.6, 4.6.7, 4.6.8 and 4.6.9 of the 2011 edition).

In Chapter 5 'Earthing installation', 'installation of earthing busbars' has been added with 2 quota sub-items, 'installation of earth electrodes' with 2 quota sub-items and 'resistance-reducing earthing installation' with 2 quota sub-items; 1 quota sub-item has been revised and 2 quota sub-items have been deleted (see 5.5; 5.1 of the 2011 edition).

In Chapter 6 'Installation of control equipment', 'monitoring system' has been added with 4 quota sub-items, 'installation of protection panels, desks and cabinets' has been supplemented with 4 new quota sub-items, 'installation of control panels, desks and cabinets' with 4 new quota sub-items, 'installation of AC and DC power supplies' with 1 new quota sub-item and 'installation of AC and DC screen cabinets' with 2 new quota sub-items; 'installation of terminal boxes' has been added with 1 quota sub-item; 1 quota sub-item has been revised and 5 quota sub-items have been deleted (see 5.6; 6.2 of the 2011 edition).

In Chapter 7 'Installation of overhead lines', 'erection of concrete poles' has been supplemented with 1 new quota sub-item, 'erection of steel tubular poles' with 1 new quota sub-item, 'aluminium conductor steel-reinforced' with 2 new quota sub-items and 'transport of materials for line erection' with 10 new quota sub-items; 7 quota sub-items have been revised and 10 quota sub-items have been deleted (see 5.7; 7.2 and 7.3 of the 2011 edition).

In Chapter 8 'Installation of communication systems', 'installation of communication equipment' has been supplemented with 2 new quota sub-items; 4 quota sub-items have been revised and 17 quota sub-items have been deleted (see 5.8; 8.2, 8.3, 8.4 and 8.5.3 of the 2011 edition).

In Chapter 9 'Installation of water supply and drainage, heating and ventilation and fire-fighting equipment', 2 new quota sub-items have been added and 61 quota sub-items have been deleted (see 5.9; 9.1, 9.2 and 9.3 of the 2011 edition).

In Chapter 10 'System commissioning', 'subsystem commissioning' has been supplemented with 11 new quota sub-items and 'tests on special electrical items' with 2 new quota sub-items; 56 quota sub-items have been revised and 17 quota sub-items have been deleted (see 5.10; 10.1.2, 10.1.3, 10.1.6, 10.1.7, 10.1.8, 10.1.9, 10.2.1 and 10.2.2 of the 2011 edition).

The number of quota sub-items for civil construction works has been adjusted from 508 to 363, of which 88 quota sub-items are new and 192 quota sub-items have been revised; the remaining 83 quota sub-items have not been adjusted, and 233 quota sub-items of the 2011 edition have been deleted.

In Chapter 1 'Earthworks', 'excavation with excavators' has been supplemented with 12 new quota sub-items; 74 quota sub-items have been revised and 122 quota sub-items have been deleted (see 6.1; 1.1, 1.2, 1.3, 1.4, 1.8.1, 1.9 and 1.10 of the 2011 edition).

In Chapter 2 'Rock works', 'general rock excavation' has been supplemented with 4 new quota sub-items; 'rock transport' has been added with 'bulldozer stockpiling and haulage of rock spoil' and 'loader loading and haulage of rock spoil', amounting to 10 quota sub-items in total; 'rock backfill' has been added with 1 quota sub-item for 'vibratory compaction'; 49 quota sub-items have been revised and 40 quota sub-items have been deleted (see 6.2; 2.1, 2.2, 2.3, 2.4, 2.5, 2.6 and 2.7 of the 2011 edition).

In Chapter 3 'Foundation treatment works', 'foundation replacement fill' has been added with 'lime-soil replacement fill' and 'crushed stone and bitumen-grouted crushed stone replacement fill', amounting to 4 quota sub-items; 'high-strength grouting of prestressed foundations' has been added with 1 quota sub-item; 21 quota sub-items have been revised and 18 quota sub-items have been deleted (see 6.3; 3.1, 3.3, 3.4.2, 3.5 and 3.6 of the 2011 edition).

In Chapter 4 'Concrete works', 'cast-in-place concrete' has been added with 'grid foundation, retaining wall concrete, trench concrete, apron concrete and backfill concrete', amounting to 5 quota sub-items in total; 10 quota sub-items have been revised and 6 quota sub-items have been deleted (see 6.4; 4.1.2 and 4.6 of the 2011 edition).

In Chapter 5 'Reinforcement works', 2 quota sub-items have been revised (see 6.5).

Chapter 7 'Masonry works' has been renumbered as Chapter 6 'Masonry works', comprising 13 sub-items in total; within 'brick masonry', 1 quota sub-item for 'side ditches' has been added; 12 quota sub-items have been revised and 5 quota sub-items have been deleted (see 6.6; 7.2, 7.3 and 7.4 of the 2011 edition).

Chapter 6 'Road works' has been renumbered as Chapter 7 'Road works', comprising 54 sub-items in total; within 'road base course', 'cement sand-gravel base course, lime-stabilized soil base course and cement-lime-soil base course' have been added, amounting to 36 quota sub-items in total; within 'culverts', 'reinforced concrete circular pipe culverts and reinforced concrete slab culverts' have been added, amounting to 8 quota sub-items in total; 6 quota sub-items have been revised and 21 quota sub-items have been deleted (see 6.7; 4.1.2 and 4.6 of the 2011 edition).

In Chapter 8 'Other works', within 'cable trenches' 1 quota sub-item for 'brick-built cable trenches' has been added; within 'fences', 'steel-post fences and brick-post fences' have been added, amounting to 2 quota sub-items in total; within 'brick enclosure walls' 1 quota sub-item has been added; within 'gabions', 'reinforcement gabions and lead-wire gabions' have been added, amounting to 2 quota sub-items; 18 quota sub-items have been revised and 21 quota sub-items have been deleted (see 6.8; 8.1, 8.3 and 8.4 of the 2011 edition).

The number of quota sub-items for construction machinery shift costs has been adjusted from 211 to 163, of which 115 quota sub-items have been revised, 28 quota sub-items are new and 78 quota sub-items have been deleted (see Clause 7; 'quota for machine-hour costs of construction machinery for wind power projects' of the 2011 edition).

For earth and rock machinery, 6 quota sub-items have been added for 'excavator (hydraulic backhoe, crawler type) 0.2 cubic metres, long-boom excavator 0.6 cubic metres and 1.0 cubic metres, road roller (smooth wheel) 15 t, hydraulic breaking hammer 100 mm and 140 mm'; 23 quota sub-items have been revised and 5 quota sub-items have been deleted.

For foundation treatment machinery, 2 quota sub-items have been revised and 9 quota sub-items have been deleted.

For concrete machinery, 2 quota sub-items have been added for 'forced-action mixer 0.5 cubic metres and belt conveyor 500 mm by 30 m'; 11 quota sub-items have been revised and 5 quota sub-items have been deleted.

For transport machinery, 3 quota sub-items have been added for 'flat-bed trailer set 40 t and cable conveyor JSD-3 and JSD-5'; 26 quota sub-items have been revised and 6 quota sub-items have been deleted.

For hoisting machinery, 7 quota sub-items have been added for 'truck crane 600 t, 800 t, 1000 t and 1200 t, dedicated truck crane for power transmission 10 t, crawler crane (hydraulic) 1250 t and dedicated wheeled crane 100 t'; 23 quota sub-items have been revised and 12 quota sub-items have been deleted.

For auxiliary machinery, 9 quota sub-items have been added for 'diesel generator 120 kW and 160 kW, submersible pump with outlet diameter 150 mm, sewage pump with outlet diameter 100 mm, centrifugal pump with outlet diameter 50 mm and 100 mm, SF6 gas recovery device, traction unit machinery 90 kN and tensioner-traction unit machinery 1 by 40 kN'; 10 quota sub-items have been revised and 20 quota sub-items have been deleted.

For processing machinery, 1 quota sub-item has been added for 'section steel shearing machine 500 mm'; 15 quota sub-items have been revised and 21 quota sub-items have been deleted.

This standard is under the administration of the National Energy Administration; it is proposed by, and its routine management is the responsibility of, the General Institute of Hydropower and Water Resources Planning and Design; the Sub-Technical Committee on Wind Farm Planning and Design of the Wind Power Standardization Technical Committee of the Energy Industry is responsible for the interpretation of its specific contents. Any comments or suggestions arising during implementation should be sent to the General Institute of Hydropower and Water Resources Planning and Design (address: No. 2 Liupukang Beixiaojie, Xicheng District, Beijing; postcode 100120).

Drafting organizations of this standard: General Institute of Hydropower and Water Resources Planning and Design (Renewable Energy Quota Station) and Northwest Engineering Corporation Limited of PowerChina.

Main drafters of this standard: Huang Lin, Xue Huijuan, Li Hongyu, Guan Zongyin, Zhang Juan, Wang Yonggang, Zhao Guizhi, Zhang Ziyan, Sun Lihong and Ke Yun.

This standard replaces NB/T 31010-2011.

Introduction

In recent years the onshore wind power industry has developed rapidly and the levels of technology and equipment have improved markedly; at the same time the State has issued new provisions on raising the income of workers, improving production conditions and strengthening work safety, and a number of new features and new circumstances have also emerged in the course of the construction of wind farm projects.

In order to promote the sound and orderly development of the onshore wind power industry, to meet the needs of project construction management, to reflect more effectively the relevant State policies and provisions, to further strengthen and standardize the management of engineering cost, to improve the management system for engineering cost, to determine project investment in a rational manner and to raise investment efficiency, this standard has been formulated in accordance with the requirements of the Notice of the National Energy Administration on Issuing the 2015 Plan for the Formulation (and Revision) of Industry Standards in the Energy Field (Guo Neng Ke Ji [2015] No. 283), on the basis of in-depth investigation and research, careful summarization of practical experience, reference to relevant domestic standards and wide solicitation of comments.

Structure and contents of the standard

Clause 1 Scope, page 1.

Clause 2 Normative references, page 1.

Clause 3 General provisions, page 1.

Clause 4 Structure and explanations, page 1; 4.1 Structure, page 1; 4.2 Explanations, page 1.

4.2.1 General explanations, page 1.

4.2.2 Explanations on the cost estimate quota for equipment installation works, page 2.

4.2.3 Explanations on the cost estimate quota for civil construction works, page 2.

4.2.4 Explanations on the quota for construction machinery shift costs, page 3.

Clause 5 Cost estimate quota for equipment installation works, page 3.

5.1 Installation of wind turbine generator units, installation of towers (frames), installation of foundation rings and prestressed anchor bolts, page 3.

5.2 Transformer installation, page 7.

5.3 Installation of switchgear equipment, page 17.

5.4 Busbar and cable installation, page 33.

5.5 Earthing installation, page 43.

5.6 Installation of control equipment, page 44.

5.7 Overhead lines, page 46.

5.8 Installation of communication systems, page 53.

5.9 Installation of water supply and drainage, heating and ventilation and fire-fighting equipment, page 54.

5.10 System commissioning, page 54.

Clause 6 Cost estimate quota for civil construction works, page 58.

6.1 Earthworks, page 58.

6.2 Rock works, page 68.

6.3 Foundation treatment works, page 78.

6.4 Concrete works, page 84.

6.5 Reinforcement works, page 91.

6.6 Masonry works, page 91.

6.7 Road works, page 93.

6.8 Other works, page 99.

Clause 7 Quota for construction machinery shift costs, page 109.

Annex A (normative) Altitude and elevation coefficients, page 118.

Annex B (normative) Loss rates of installation materials, page 119.

Annex C (normative) Transport weights of materials, page 120.

Annex D (normative) Weights of fireproof packs, page 121.

Annex E (normative) Classification of soils, page 122.

Annex F (normative) Slope coefficients, page 123.

Annex G (normative) Classification of rock (Protodyakonov), page 124.

Annex H (normative) Bulking and compaction coefficients of earth and rock, page 125.

Annex I (informative) Reference mix proportions for concrete, page 126.

List of quota tables

Table 1 Installation of wind turbine generator units, page 3; Table 2 Installation of towers (frames), page 5; Table 3 Installation of foundation rings and prestressed anchor bolts, page 6.

Table 4 Installation of package (box-type) substations, page 8; Table 5 Installation of three-phase power transformers, page 8; Table 6 Installation of dry-type transformers, page 14.

Table 7 Installation of arc-suppression coils, page 15; Table 8 Installation of reactors, page 16.

Table 9 Installation of circuit breakers, page 18; Table 10 Installation of disconnecting switches, page 19; Table 11 Installation of instrument transformers, page 24.

Table 12 Installation of fuses, page 26; Table 13 Installation of surge arresters, page 27; Table 14 Installation of neutral-point equipment of the main transformer, page 29.

Table 15 Installation of complete high-voltage switchgear cabinets, page 29; Table 16 Installation of earthing transformers and complete earthing resistance devices, page 30.

Table 17 Installation of gas-insulated combined switchgear (GIS), page 31; Table 18 Installation of entrance and exit bushings of gas-insulated combined switchgear (GIS), page 31.

Table 19 Installation of capacitors, page 32; Table 20 Installation of dynamic reactive power compensation devices, page 33.

Table 21 Busbar installation, page 34; Table 22 Installation of wall bushings, page 36; Table 23 Installation of post insulators, page 37.

Table 24 Cable laying, page 37; Table 25 Installation of cable supports and cable trays, page 40; Table 26 Installation of cable terminations, page 40.

Table 27 Cable fire protection, page 42; Table 28 Laying of cable protection conduits, page 42.

Table 29 Installation of earthing busbars, page 43; Table 30 Installation of earth electrodes, page 43; Table 31 Resistance-reducing earthing installation, page 44.

Table 32 Monitoring system, page 44; Table 33 Installation of protection panels, desks and cabinets, page 44; Table 34 Installation of control panels, desks and cabinets, page 45.

Table 35 Installation of AC and DC power supplies, page 45; Table 36 Installation of AC and DC screen cabinets, page 45; Table 37 Installation of terminal boxes, page 46.

Table 38 Erection of concrete poles, page 47; Table 39 Erection of steel tubular poles, page 48; Table 40 Erection of steel towers, page 49.

Table 41 Stringing of aluminium conductor steel-reinforced, page 49; Table 42 Transport of materials for line erection, page 50.

Table 43 Installation of communication equipment, page 53; Table 44 Installation of communication lines, page 53.

Table 45 Installation of fire-fighting water supply and drainage equipment and of heating and ventilation equipment, page 54.

Table 46 Subsystem commissioning, page 54; Table 47 Commissioning of the complete electrical system, page 57; Table 48 Tests on special electrical items, page 57.

Table 49 Site levelling, page 59; Table 50 Manual excavation of trenches, page 59; Table 51 Manual excavation of column pits, page 60.

Table 52 Excavation of soil with excavators, page 61; Table 53 Transport of earth, page 63; Table 54 Earth backfill, page 67; Table 55 Bulldozer earthmoving, page 67.

Table 56 General rock excavation, page 68; Table 57 Rock excavation in trenches, page 69; Table 58 Rock excavation in pits, page 71.

Table 59 Transport of rock, page 73; Table 60 Rock backfill, page 77.

Table 61 Foundation replacement fill, page 79; Table 62 High-strength grouting of prestressed foundations, page 80.

Table 63 Drilling of holes for bored piles, page 80; Table 64 Casting of cast-in-place concrete piles, page 81; Table 65 Precast concrete piles, page 81.

Table 66 Vibro-replacement crushed stone piles, page 83; Table 67 Drilling with pneumatic drills, page 84.

Table 68 Cast-in-place concrete, page 85; Table 69 Installation of precast concrete, page 87; Table 70 Concrete mixing, page 88.

Table 71 Concrete transport, page 89; Table 72 Concrete corrosion protection, page 90; Table 73 Fabrication and installation of reinforcement, page 91.

Table 74 Dry-laid block stone, page 92; Table 75 Mortar-laid block stone, page 92; Table 76 Mortar-laid precast concrete blocks, page 92; Table 77 Brick masonry, page 93.

Table 78 Road bedding course, page 93; Table 79 Road base course, page 94; Table 80 Road surface course, page 95; Table 81 Culverts, page 97.

Table 82 Structural supports and frames for transformer and distribution works, page 99; Table 83 Fabrication and installation of steel structures, page 103; Table 84 Lightning rod towers, page 103.

Table 85 Cable trenches, page 104; Table 86 Reinforced concrete tanks, page 106; Table 87 Sand bedding and brick covering of cables, page 107.

Table 88 Fences, page 107; Table 89 Brick enclosure walls, page 108; Table 90 Gabions, page 109; Table 91 Sandy-soil cofferdams, page 109.

Table 92 Quota for construction machinery shift costs, page 111.

Table A.1 Altitude and elevation coefficients, page 118; Table B.1 Loss rates of installation materials, page 119; Table C.1 Transport weights of materials, page 120; Table D.1 Weights of fireproof packs, page 121.

Table E.1 Classification of soils, page 122; Table F.1 Slope coefficients, page 123; Table G.1 Classification of rock (Protodyakonov), page 124; Table H.1 Bulking and compaction coefficients of earth and rock, page 125.

Table I.1 Conversion coefficients for replacing crushed stone with pebbles, page 126; Table I.2 Mix proportion of medium sand and crushed stone concrete of strength grade C15, page 126; Table I.3 Mix proportion of medium sand and crushed stone concrete of strength grade C20, page 127; Table I.4 Mix proportion of medium sand and crushed stone concrete of strength grade C25, page 127.

Table I.5 Mix proportion of medium sand and crushed stone concrete of strength grade C30, page 128; Table I.6 Mix proportion of medium sand and crushed stone concrete of strength grade C35, page 129; Table I.7 Mix proportion of medium sand and crushed stone concrete of strength grade C40, page 129; Table I.8 Mix proportion of medium sand and crushed stone concrete of strength grade C45, page 130.

1 Scope

NB/T 31010-2019 is the Chinese cost estimation quota for onshore wind farm projects, replacing the 2011 edition. It is the book of unit rates an estimator uses to build the budget estimate of a wind farm at the design stage, and the document a reviewer checks that estimate against. The volume runs to more than ninety quota tables plus seventeen tables of appendices, and it covers the work a wind farm actually consists of: site access roads and hardstandings, excavation and backfill for the turbine foundations, the reinforced concrete foundations themselves across their types and sizes, the erection of tower sections, nacelle, hub and blades with the heavy cranes that requires, the installation of the turbine and its internal equipment, the collection network in buried cable and overhead line, the step-up substation with its transformers, switchgear, protection and control, the communication and SCADA systems, the site buildings, and the commissioning that closes the works. Each quota item states the work content, the unit of measurement, the labour hours by trade, the machine-shift consumption by equipment type and the material quantities. The general explanation at the front sets the scope of the quotas, what each rate already includes, the adjustment coefficients for terrain, altitude and working conditions, and the rules for measuring quantities. Owners, developers and cost consultants use it to prepare budget estimates and tender prices for onshore wind projects in China.