Thông tư 17/2019/TT-BXD hướng dẫn đo bóc khối lượng xây dựng công trình

• Số hiệu: 17/2019/TT-BXD
• Loại văn bản: Thông tư
• Nơi ban hành: Bộ Xây dựng
• Người ký: Bùi Phạm Khánh
• Ngày ban hành: 26/12/2019

MINISTRY OF CONSTRUCTION -------	SOCIALIST REPUBLIC OF VIETNAM Independence - Freedom - Happiness ---------------
No.17/2019/TT-BXD	Hanoi, December 26, 2019

CIRCULAR

INSTRUCTIONS ABOUT CONSTRUCTION QUANTITY TAKEOFF

Pursuant to the Government's Decree No. 81/2017/ND-CP dated July 17, 2017, defining the functions, tasks, powers and organizational structure of the Ministry of Construction;

Pursuant to the Government’s Decree No. 68/2019/ND-CP dated August 14, 2019 on management of investment and construction costs;

Upon the request of the Director of Institute of Construction Economics and the Director of Construction Economics Department;

The Minister of Construction hereby promulgates the Circular as a manual for quantity takeoff for construction works.

Chapter I

GENERAL PROVISIONS

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This Circular shall provide instructions about quantity takeoff or measurement of construction works as a basis to determine and manage investment and construction costs of investment and construction projects funded by the state budget and non-budgetary capital, and other public-private partnership (PPP) investment projects.  

Projects funded by official development aid (ODA) capital shall be subject to regulations laid down in treaties and regulations of domestic laws specified in the Law on Treaties.

Article 2. Subjects of application

This Circular shall apply to entities and persons involved in determination, estimation or surveying of quantities of construction works as a basis to manage investment and construction costs of investment and construction projects funded by the state budget and non-budgetary capital, and other public-private partnership (PPP) investment projects.  

Article 3. Quantity takeoff principles

1. Measurement/quantity takeoff of construction works means the determination of detailed quantities or volumes of a construction work by using the method of measurement, counting, calculation and checking on the basis of the size and quantity prescribed in design drawings, design explanations, or from the request for project implementation, construction, technical or engineering guides, other relevant documents and guidelines, and Vietnamese construction standards and regulations.

2. The quantity takeoff for a construction work must serve correct purposes, using methods of determining and managing construction investment expenses according to regulations.

3. Quantities produced after measurement or takeoff activities need to show the property, structure, main materials used and construction methods, and provides all conditions necessary for determining construction expenses.

4. For a number of parts of a construction work, the construction volumes belonging to a construction work or work item that cannot be measured in an exact or detailed manner, it is possible to make a quantity estimate. Estimated quantity is determined when the works are specified in the design document or project implementation requirements but it is not possible to determine the exact quantities according to the takeoff rules. The estimated quality will be taken off again when performing acceptance testing, payment and settlement or as specified in the construction contract.

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Article 4. Requirements for quantity takeoff of construction works

1. Construction quantity takeoff documentation shall comprise:   Summary or general bill of quantities, Detailed or breakdown bill of quantities and detailed statistics sheets (if any).

2. Requirements of the general or summary bill of quantities

a) Summary or general bill of quantities is a summary of the results of takeoff of a construction work or work item, providing information on volumes, quantities and other relevant information as a basis to determine construction costs.

b) All construction tasks/task groups to be performed must be recorded in the summary or general bill of quantities. The summary or general bill of quantities is made for the whole construction work or separately for each work item, bidding package and according to the project schedule and project implementation requirements.

c) Subject matters of the general or summary bill of quantities, including:  List of tasks/task groups, unit of measurement, method of measurement, results of measurement, and description of works (if necessary). The layout and representation of data in the summary or general bill of quantities must be simple and concise. The sample bill of quantities is given in the Appendix 2 hereto.

3. Detailed or breakdown bill of quantities for a construction work or work item shall be used for providing detailed explanations about the calculation method and the results produced after the takeoff process. The sample bill of quantities is given in the Appendix 3 hereto.

4. The list of works needs to be measured in accordance with the design drawing and the construction order, showing the full contents of construction works that need to be measured, positions of parts and construction activities of construction works.

5. Units of measurement shall be selected according to management requirements and designs and conform to those belonging to the normative system and system of units prescribed in current regulations.

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7. Construction quantity takeoff results shown in the detailed or breakdown bill of quantities shall be integrated into the summary or general bill of quantities after being processed according to the principle of rounding numerical values. In case the calculation result is a decimal, the thousandths place value shall be accepted.

Article 5. Use of quantity results achieved by running design or quantity takeoff software  

1. In the case of using quantity statistics produced by design software programs and other specialized automated takeoff and estimating software, it shall be necessary to clearly specify the measurement or estimation methods in the summary or general bill of quantities. Organizations or individuals performing quantity takeoff, measurement or estimation activities by using software shall be responsible for the accuracy of these statistics and shall be accountable to verification and evaluation authorities for the conformity of the data and quantity takeoff principles of such software. The quantity statistics produced from design and other specialized software must be consistent with the principles defined under the guidance given herein.

2. The reporter of quantity statistics produced by design and other specialized software programs mentioned in clause 1 of this Article needs to know the contents of such data, supplement the descriptive information suitable for costing or application of unit prices and norms.

Chapter II

QUANTITY TAKEOFF REGULATIONS

Article 6. Measurement and takeoff of quantities in proportion to the designed size, output or service capacity of construction works

1. Taking off the quantity in ratio to the size, output or service capacity of a construction work shall serve the purpose of making the preliminary calculation or estimate of total investment or total construction investment according to the construction investment rate-based calculation method.

2. Taking off quantities in proportion to the building floor area of a civil or industrial construction work

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b) Descriptive information, including the height of the building (height of each floor or height of the whole building), the number of floors (including superficial floors and basements), structural properties, main materials used, special foundation reinforcement and other information related to costing activities (if any), should be recorded in the detailed or breakdown bill of quantities.

3. Quantity takeoff in ratio to the area of traffic bridges

a) Quantity in ratio to the area of a road bridge shall be taken off in proportion to the width of the bridge between the outermost of handrails and the length of the bridge stretching to the abutment end dam.

b) Descriptive information, including type of bridge, type of bridge girder, bridge width, span length, type of pile, length of foundation pile and other information related to cost calculation (if any), should be included in the detailed or breakdown bill of quantities.

4. Measurement and takeoff of quantities in proportion to the output or service capacity of a construction work

a) For works already included in the investment portfolio promulgated by competent authorities, the units of measurement used for quantity takeoff must comply with the corresponding units used in the investment book of record already in circulation.

b) When taking off the quantity in ratio to the designed output, technical specifications or service capacity of a construction work, descriptive information should clarify the properties, characteristics and types of materials used as specified in the basic design and other necessary requirements.

Article 7. Quantity takeoff in ratio to work groups, structural units or parts of construction works

1. The list of working groups, structural units or parts of a construction work shall be selected on the basis of objectives of performing main tasks in the construction process.

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a) The unit of measurement shall be determined in accordance with the main type of construction tasks, structural units or parts of the construction work for the sake of convenience of measurement or calculation on drawings or on site surveying when developing and carrying out construction works, and shall conform to units of measurement according to announced norms (if any).

b) For work groups, structural units or parts already in the list of norms and unit prices promulgated by competent authorities, their names and units of measurement recorded in the detailed or breakdown bill of quantities, or the general or summary bill of quantities, of a construction work or work item must be in conformity with the names and units of measurement included in the book of record of norms and unit prices already in circulation.

3. The quantity taken off or measured according to the work group, structural unit or parts of a construction work shall be carried out according to the methods of measurement, counting, calculation or inspection on the basis of the size, amount and statistics in design documentation, technical instructions and requirements of works to be performed in a construction work.

Article 8. Quantity takeoff in ratio to construction activities

1. The quantity must be measured, counted and calculated in the order appropriate to the technological process and work construction order. Detailed instructions on how to take off the quantity of major construction tasks shall be provided in Appendix 1 hereto.

2. For works specified in the list of norms or construction unit prices published by competent authorities, their names and units of measurement for these works recorded in the detailed or breakdown bill of quantities, or the general or summary bill of quantities, of a construction work or work item must be conformable to the respective names and units of measurement included in the system of norms and unit prices.

Article 9. Quantity measurement and estimation in acceptance testing, commissioning, payment and settlement of construction contracts

1. When preparing the bidding documents, the project owner must clearly specify the quantity takeoff principles and methods for acceptance testing, commissioning, payment and settlement of contracts.

2. Unless otherwise agreed in the contract, the principles of quantity takeoff of major construction activities shall be subject to Appendix 1 and other relevant regulations.

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Chapter III

RIGHTS AND RESPONSIBILITIES OF PROJECT OWNERS, INVESTORS ORGANIZATIONS AND INDIVIDUALS FOR CARRYING OUT CONSTRUCTION QUANTITY TAKEOFF

Article 10. Rights and responsibilities of owners or investors of construction works or projects

1. They shall exercise the following rights:

a) Where necessary, they may hire construction investment consultancy organizations that fully meet the prescribed qualification and experience requirements to render construction quantity takeoff, verification and control.

b) Request the consultant to clarify quantity takeoff results, and provide information and documents related to quantity takeoff results.

c) Exercise other rights in accordance with laws.

2. They shall assume the following responsibilities:

a) Conduct the inspection and acceptance of construction quantity takeoff data when carrying out the acceptance testing of documentation on project formulation, design, construction cost estimation, payment and final settlement of construction contracts, ensuring their representation and meeting the regulatory requirements.

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c) Assume other responsibilities prescribed by law.

Article 11. Rights and responsibilities of organizations and individuals carrying out construction quantity takeoff

1. They shall exercise the following rights:

a) Request the investor or the investor's representative to provide information and documents necessary for quantity takeoff activities.

b) Refuse to record quantities not shown in the attached design or technical instructions in the quantity takeoff results.

c) Have other rights prescribed in contracts with investors/project owners or other relevant laws on construction quantity takeoff and measurement.

2. They shall assume the following responsibilities:

a) Carry out construction quantity takeoff in accordance with their prescribed capacity.

b) Appoint qualified people to take charge of quantity takeoff and taking quality control measures for construction quantity takeoff activities.

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d) Bear responsibility before law and to investors/owners/developers for construction quantities falling within the scope of their assigned takeoff duties.

d) Individuals performing construction quantity takeoff activities shall have the burden of studying and firmly grasping the information shown in the attached design drawings and instructional documents in the course of carrying out construction quantity takeoff. Where necessary, require the designer to clearly explain design issues related to construction quantity takeoff activities.

e) The person in charge of quantity takeoff shall be mainly responsible for the content and quality of information and figures shown in the bill of quantities. The person carrying out quantity takeoff shall coordinate, explain and clarify the content related to the quantity takeoff results with the person in charge of quantity takeoff activities.

g) Assume other responsibilities prescribed by law.

Chapter IV

IMPLEMENTATION PROVISIONS

Article 12. Transition provisions

Transitional issues shall be dealt with in compliance with Article 36 in the Government’s Decree No. 68/2019/ND-CP dated August 14, 2019 on management of construction investment expenses.

Article 13. Entry into force

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PP. MINISTER
DEPUTY MINISTER




Bui Pham Khanh

APPENDIX 1

QUANTITY TAKEOFF INSTRUCTIONS FOR MAIN CONSTRUCTION ACTIVITIES
(To the Circular No. 17/2019/TT-BXD dated December 26, 2019 of Ministry of Construction)

1. Demolition quantity takeoff

The quantity of demolition work is classified according to the type of structure to be demolished, type of material to be demolished, construction measures and construction conditions.

The description of demolition work needs to show support measures (if any), the quantity of support measures and transportation of wastes from the works which are calculated into separate works.

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2. Earthwork quantity takeoff 

Excavation quantity must be taken off according to the group, type of work, grade of soil, rock, depth of excavation, the width of the excavated pit, excavation conditions and methods (whether manual or automated).

Backfilling quantity must be taken off according to the group, type of work, the type of filling materials (soil, rock, sand,...), grade of soil or rock, thickness of the layer of filling materials, the required tightness, or backfilling conditions and methods (whether manual or mechanized).

The excavation and backfilling quantity shall be calculated according to the dimensions indicated in the design drawings, construction standards, and shall be tested before acceptance without any addition of expansion, shrinkage or loss.

In case of digging of soil for earth fill purposes, the quantity of excavated soil shall be calculated by multiplying the quantity of fill soil by the coefficient of conversion from excavated soil to fill soil. In case of buying non-cohesive soil for fill purposes, the quantity of such soil shall be determined by multiplying the soil quantity measured at the filling place by the soil porosity coefficient (equal to the dry volumetric weight of the soil according to the design requirements divided by the field dry and pore volumetric weight of the soil).

The excavation and back fill quantity during the takeoff process shall not include the occupancy quantity of underground works (e.g. technical pipes, sewers, etc.). When calculating the excavation quantity, the weight of different types of soil / rock that are different from the grade of soil / rock being taken off shall not be calculated separately if the excavation quantity is less than 1m^3.

As for the works like digging and backfilling for foundations of high-rise buildings, hydraulic works, piers, abutments, tunnels, directional works and weak grounds, in the descript of excavation and backfill activities, measures used for excavation and backfill works, such as installment of piles to prevent erosion, etc. (if any), must be clearly stated.

The utilization of excavated materials (if any), the plan for transportation of excavated materials out of works must be specified in the description of work items in the summary or general bill of quantities.

3. Masonry quantity takeoff 

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The masonry quantity includes both the protruding parts and details linked with the masonry block as shown in the design, and does not need to take away the quantity of non-masonry blank spaces existing in the masonry block of less than 0.25m^2.

The thickness of wall in question does not include cladding or coating (plastering). The thickness of the beveled wall is the average thickness of that wall.

Building standalone walls with the maximum length of 4 times more than the wall thickness is deemed as building columns or pillars.

The quantity of column and pillar attached to a wall or designed using the same materials as the wall or worked at the same time as the wall masonry shall be deemed as the quantity of that wall.

4. Concrete work quantity takeoff 

The quantity of concrete is measured and classified separately by the method of concrete production (concrete mixed in place, commercial concrete), by the type of concrete used (macadam concrete, asphalt concrete, heat-resistant concrete, sulfate-resistant concrete,...), material size (stone, gravel, sand ...), cement grade, concrete mortar grade, or by structural part details (foundations, walls, columns. ..), or by the thickness of concrete block, the height of work, the concrete structure (precast concrete), or by construction conditions and methods.

The concrete quantity to be taken off is the entire concrete structure, including protruding parts, except for the volume of rebar, laces, code sheets, prestressed parts (exclusive of cable conduits, ultrasonic tubes), pores on the surface of concrete structure with the volume of less than 0.1 m^3 inside the concrete work.

As for columns, pillars connected to walls, if they are made from the same aggregates or are of the same concrete grade as the wall and do not require to be separately cast, they shall be taken off as parts of the wall.

As for the concrete parts connecting columns with beams, if they are made from the same aggregates, are of the same concrete grade and do not require separate casting, then they shall be taken off as parts of the beam.

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Special requirements regarding compaction, maintenance solutions or special treatment techniques according to designs or standards, rules, plans for concrete transportation (distance, vehicle type), percentage of concrete aggregate should be clearly stated in the detailed or breakdown, or summary or general, bill of quantities.

5. Formwork quantity takeoff 

The quantity of formwork shall be taken off or classified separately according to design requirements or materials used as formwork (e.g. steel, wood, film covered plywood,…).

The quantity of formwork is measured for the surface of the concrete work which needs to be temporarily supported during casting (including protruding parts of the formwork according to technical standards or technical instructions), not excluding surface voids of the concrete structure of ​​less than 1m^2.

If the quantity of formwork is commensurate with profiled sheets upon construction according to technical specifications with the measure of greater than 3m^2, the dimensional size of voids on the surface of concrete structures must not be deducted.

Formwork retained for construction works, materials used for formwork, number of rotation times of formwork (if necessary) should be clearly stated in the description of work items in the summary or general bill of quantities.

6. Rebar quantity takeoff 

The rebar quantity must be taken off and classified by the type of steel (normal and pre-stressed, plain or deformed bars), bar grades, groups, and diameter of rebar according to the details of structural parts (foundations, columns, walls ...) and work conditions.

The quantity of rebar to be taken off shall include the quantity of rebar, splice joints, threaded connections, pipe joints, cushions, spacers, bolts and the quantity of rebar worked according to the same reinforcement method as the supporting steel between two layers of rebar, ... (if any). The quantity of prestressing cables to be taken off shall be commensurate with the length of the structure using prestressed cable.

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7. Pilework quantity takeoff 

The quantity of pilework must be taken off and classified according to the type of input material (e.g. bamboo, wooden, reinforced concrete, steel piles, ...), pile size ..., (length, diameter, cross section of each pile), pile installation methods (pile driving, pressing, ...), pile depth, rock and soil grade, work conditions (terrestrial, underwater, freshwater, brackish water, salt water environment ) and pilework approaches (manual, mechanized).

The depth of pile is measured along the axis of the pile from the point of contact with the ground to the height of the pile tip.

Information related to the requirements concerning pile driving, connection and pile head breaking should be clearly stated in the detailed/breakdown or summary/general bill of quantities.

For Barrete piles or precast reinforced concrete piles cast in place, concrete work or rebar work quantity takeoff  shall be carried out according to instructions on the concrete work (Section 4) and rebar work (Section 6) mentioned above.

Permanently retained wall pipes (for the purposes of working bored piles, retaining pile walls, etc.) must be clearly stated in the detailed/breakdown or summary/general bill of quantities.

8. Drillwork quantity takeoff 

Drillwork quantity must be taken off and classified according to bore diameter, drilling depth, drilling conditions (land or underwater, freshwater, brackish water, salt water environment), soil and rock grades; drilling methods (straight, oblique drilling) and drilling equipment (rotary, helical, pendulum drills, etc.), techniques used to protect boreholes (wall pipes, bentonite ...).

The drilling depth is measured along the borehole, starting from the point of contact with the ground to the height of the bottom of the drilling pit.

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9. Roadwork quantity takeoff 

The roadwork quantity must be taken off and classified according to the type of road (cement concrete, asphalt concrete, bitumen, aggregate roads, ...), according to the placement order of structure (road foundation, basement, surface), thickness of each layer, or according to construction methods.

The roadwork quantity to be taken off shall not require any subtraction of the quantity of holes on the road surface (such as manholes, inspection chambers or the like) with the measure of ​​less than 1m^2.

Information on the type of materials, the thickness of aggregate layers, cross-section, and pavement, should be clearly stated in the detailed/breakdown or summary/general bill of quantities.

The quantity of works such as pavement, median strip, protective railing, painting or marking, grass growing area, marker posts, signboards, lighting systems,... shall be taken off separately.

Quantity takeoff of masonry, concrete, rebar works, ... belonging to the road construction activities shall be carried out according to instructions on masonry work quantity takeoff (Section 3), concrete work quantity takeoff (Section 4) and rebar work quantity takeoff (Section 6) mentioned above.

10. Pipework quantity takeoff 

Pipework quantity shall be measured and classified according to the type of pipe, pipe size and materials (concrete, cast iron, steel, ...).

The length of a pipe is measured along the center line of the pipe. The length of the water distribution pipe and drainage pipe is measured inclusive of the length covering fittings and valves. Length of storm water drainage pipe or sewer does not include the occupancy length of manholes, collector pits and inspection chambers.

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11. Structural steelwork quantity takeoff 

The structural steelwork shall be taken off and classified according to the type of steel, technical properties of steel, structural size, forms of joints (welded, bolted ...), necessary technical requirements in the process of manufacture, erection, processing or erection solutions (manual, mechanized, use of temporary support pillars for erection or installation of steel structures, ...).

The steel structure quantity is taken off according to the quantity of constituent steel bars and sheets. The structural steelwork quantity includes the quantity of superimposed joints in accordance with technical regulations, oblique cutting, bevel cutting or cut-off quantities to create grooves, holes or carve in the surface of the steel structure with each hole having the measure of ​​less than 0.1m^2 as well as the quantity of bolts, nuts and spacers, but excluding the quantity of bolts, jigs, temporarily assembled details.

As for steel structures used for works, the time of use, number of rotation, liquidation, recovery times, etc., must be clearly stated in the detailed/breakdown or summary/general bill of quantities.

12. Structural woodwork quantity takeoff 

The structural woodwork quantity must be taken off and classified according to wood groups, details of structural parts (wooden trusses, wooden purlins, wooden ridges, wooden beams, wooden deck structures, ...), size of connecting components, details, joints in spatial structure, work conditions and methods.

Such quantity includes wooden dovetails or joints or connectors. As for wooden floors, walls and ceilings, the quantity of gaps and voids of less than 0.25 m^2 shall not be deducted. Materials used to support the assembly of wooden structures, such as scaffolding and struts,…, shall be excluded from calculation of such quantity.

The length of wooden parts to be measured is the total length without excluding joints, dovetails or connectors.

The quantity of metal materials used to enhance the hardness of wood structures and joints of iron, steel, bolts, anchors, turnbuckles, nails, ..., and surface finishes, shall be taken off separately.

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13. Finishing work quantity takeoff 

a) General requirements of finishing works

The finishing work quantity shall be taken off and classified according to works to be completed (plastering, polishing, tiling, painting, plating, installation of doors, ceilings and roofs, etc.); according to the thickness of surfaces that need to finish (plastering, polishing, painting, plating,...); according to technical specifications of the materials to be used (medium type, medium grade, wood grade, stone type, ceiling board type, roof type ... ); according to details of structural parts (beams, columns, walls, pillars, ceilings, roofs ...); according to work conditions and methods.

The finishing work quantity to be taken off shall not need to deduct the quantity of voids or gaps not requiring finishing with the measure of ​​less than 0.25m^2.

Information about technical properties of materials should be clearly stated in the detailed/breakdown or summary/general bill of quantities.

b) Plastering and polishing work quantity takeoff

The taken-off quantity is the amount of surfaces to be finished that are in contact with the foundation of structure, including smooth joints, edges, corners, flat intersections, indentations, protrusions, etc. The quantity of threaded edges, cornices and other materials used for bonding for plastering or polishing works, such as corner guards, strands, and steel grids, shall be calculated separately.

c) Tiling work quantity takeoff

The taken-off quantity is the quantity of the surfaces to be tiled and paved of the structures, including joints, edges, corners, paving for formation of trough or trench-shaped lines, paving on underground pipelines and manhole covers, paving into frames and paving around pipes, cantilever beams and the like ...

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d) Door installation work quantity takeoff 

The taken-off quantity shall be classified according to the type of door and door parts, such as door frames, panels, splints, decorative splint sheets, door boxes, slot sealers (if any), locks, other automated open/close fittings, etc.

Information such as door materials (wooden doors, glass doors, metal doors, plastic doors, rolling doors,...), material properties (wood group, metal material,...), method of joint, characteristics of installation positions (brick walls, concrete walls, wooden structures, etc.), surface treatment and finishing before installation must be clearly stated in the detailed/breakdown or summary/general bill of quantities.

d) Ceiling work quantity takeoff 

The taken-off quantity shall be classified according to the ceiling type (including ceiling panels, ceiling beams, suspension frames, braces, gaskets, border bars,...) of a technical systems of works fixed to the ceiling.

The takeoff quantity can be calculated separately according to ceiling panels and ceiling beams, suspension frames,...

e) Roof work quantity takeoff 

The quantity shall be taken off and classified according to the type of roof, the roof surface corresponding to each quantity of roof part such as trusses, rafters, purlins, ridges, roof layers classified by the materials used (including roof tiling and making steep roof panels).

g) Painting or coating work quantity takeoff

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The area to be measured for pipe painting is the length multiplied by the circumference of the section of the painted pipe without any deduction or addition of flanges, valves, brackets and other protruding fittings.

When calculating the paint area of ​​metal structure parts, each connecting plate, rivets, bolts, nuts and the like shall not be calculated in detail.

For steel structures requiring protective paint before installation, the painting quantity shall include the additional quantity of crack-patching or feather edging painting for finishing after installation.

14. Quantity takeoff for installation of technical systems of construction works

The quantity of installation of engineering systems such as electricity, water supply, ventilation, heat supply, light electricity, fire alarm, fire fighting ... shall be taken off and classified according to each type of supplies, accessories; according to technical specifications (sections, categories,...) of technical system of works according to the diagram design of the system, taking into account curved points or kinks according to details of structural parts; according to installation modules; according to the type of connection; according to working methods and conditions (height, depth of installation).

15. Quantity takeoff for installation of equipment of construction works

The quantity of construction equipment installation shall be taken off and classified according to the type of equipment, assemblies, system of equipment to be installed; according to the installation modules; according to the type of connection; according to work methods and conditions (height, depth of installation) ...

The quantity of installation of construction equipment includes all accessories for on-site finishing, equipment, assemblies and equipment systems that conform to designs and serve inspection, test run and temporary operation.

16. Scaffolding work quantity takeoff

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Scaffolding height ranges from the height from the ground surface, the current floor of the work to the maximum height, ensuring favorable conditions for construction.

With respect to takeoff of the quantity of steel scaffolding tools used for construction, in addition to the above-mentioned principles, attention should be paid to a number of specific provisions as follows:

- The quantity of external scaffolding is calculated by the vertical projection area on the outside of the structure.

- The quantity of internal scaffolding is calculated according to the flat projection area of ​​the structure and only calculated for works with the height of greater than 3.6 m according to the principle of taking the height of 3.6 m scaffold as the benchmark and, for every height increased by 1.2m, one more layer accrued, except the increase of less than 0.6m which is not counted in the quantity.

- The quantity of scaffolds for finishing of standalone columns or pillars is calculated according to the circumference of the column or pillar cross-section plus 3.6m times the height of column or pillar.