How to calculate the tender for ventilation engineering

How to calculate the tender for ventilation engineering

A, ventilation pipeline engineering calculation rules:

1, duct engineering quantity calculation, regardless of material, shall be based on the length of the duct centerline in the construction drawing, calculated according to the expanded area of duct with different cross-sectional shapes (circular, square and rectangular), and measured in square meters.

(1), the deployment area of circular air duct, without deducting inspection holes, measuring holes, air supply openings, air suction openings, etc. , occlusal overlapping area, occlusal overlapping part does not increase.

(2) The calculation of duct length should be based on the centerline length shown in the construction drawing, including the lengths of elbows, tees, reducers and local pipe fittings. The length of the branch pipe is defined as the intersection point between the centerline of the branch pipe and the centerline of the main pipe. The length of air duct does not include the length occupied by components, and its component length values are shown in the following table:

(3) the production and installation quota of air duct includes the production and installation of elbows, tees, reducers, round places and other pipe fittings, flanges, reinforcing frames, hangers, brackets and supports. For unpriced materials, calculate sheet metal materials, calculate the value of flanges, supports, hangers and brackets according to the quota, then calculate the quantity of materials according to specifications and varieties, and list them in the material summary table. The production and installation quota of air duct does not include the production and installation of air duct floor support. Floor support is measured in kilograms, and the equipment support subtitle in Chapter VII of Chapter IX "Ventilation and Air Conditioning Engineering" quota is used.

(4) For the manufacture and installation of purification ventilation pipes and components, the calculation method of quantities is the same as that of general ventilation pipes, with corresponding quota. However, the purification fee is to calculate the installation cost of the components, and 35% of the basic installation price of the corresponding components is used as the purification fee, of which the labor cost accounts for 40%. The essential sealing treatment between the purification pipeline and the gap of the building is calculated according to the actual cost.

⑤ Plastic air ducts and pipe fittings need to be hot-simmered, and when wooden clamping tools are used, they shall be amortized according to the first-class materials. When the quantity of air duct works is more than 30m2, it will be amortized by 0.06m3/ 10m2; 0.09 m3/ 10m2 below 30m2.

⑥ During off-site transportation of air ducts, pipe fittings, components and non-standard equipment, the construction organization design scheme made off-site must be approved, and the transportation cost is calculated as follows: freight = vehicle times × approved tonnage of vehicles × unit price per ton-kilometer × mileage vehicle times = total mass of processed parts/approved tonnage of vehicles × loading factor: 0.7 for non-standard equipment and ventilation components; Ventilation pipes and fittings are 0.5. Less than one car is counted as one car.

⑦ The manufacturing and installation of ventilation pipes should be based on materials, pipe shape, diameter and metal plate thickness, regardless of manufacturing methods (bite and welding).

Today, the sheet metal materials in the thin steel duct should be converted when the actual requirements are different, and the labor and machinery are unchanged.

Pet-name ruby blue cushion duct production and installation quota is based on a variety of materials comprehensive consideration, shall not be converted.

2, duct elbow guide according to the blade graphic area in square meters. No matter single leaf or banana-shaped Shuang Ye, they all use the same subtitle.

3. Canvas joint or artificial leather hose joint shall be calculated according to the joint length and unfolded area, and measured in square meters. Joints using artificial leather without canvas shall not be converted.

4. The production and installation quantity of air duct inspection holes is "100 kg". Please refer to Appendix 1 of Chapter 9 "Ventilation and Air Conditioning Engineering" of the National Ventilation Component Standard Table.

5. The temperature and air volume measuring holes are measured in units of "pieces". Use the corresponding subtitles.

2. Calculation of quantities for manufacturing and installation of air duct components. Valve. The manufacturing measurement is "100kg", and the corresponding subtitle is used.

Three, duct parts-tuyere production and installation engineering quantity calculation.

Second, the tuyere production quantity is calculated by mass, measured by "100 kg" and measured by "individual";

Three, leaf window tuyere according to the "square meters" measurement.

4. The quantities of manufacturing and installing range hoods are measured as "100 kg", and the installation is measured as "one". The hood has the shape of an umbrella, a cone, a cylinder, etc.

Verb (abbreviation for verb) Manufacture and installation of pipeline components-cover

Production is still measured by quality, and installation is measured by "pieces".

Six, duct parts-pin sound device production and installation quantities

Measure its production by quality and its installation by individuals.

1, metal air-conditioning shell, water filter and overflow tray shall be calculated according to the requirements of construction drawing, and the quality shall be calculated according to the standard drawing or Appendix I of ventilation and air-conditioning engineering quota, and the non-standard parts shall be calculated according to the quality of finished products.

2. The engineering quantity of steel water deflector is measured in square meters according to the end surface area of air conditioner, and the calculation formula is as follows: water deflector area = cross-sectional area of air conditioner × number of water deflector or water deflector area = =A×B× number of water deflector.

The fabrication and installation of steel flashing are classified according to the number of twists and turns (3 fold /6 fold) and the spacing between plates, and the corresponding subtitle is applied. The glass baffle adopts the steel plate water baffle corresponding to the subtitle, and its materials and machinery are multiplied by the coefficient of 0.45, and the labor cost remains unchanged.

3. Steel sealed doors should be classified by eyes and eyes respectively, and corresponding subheads should be applied.

4, equipment support quality calculation according to the requirements of construction drawing.

Eight, fan installation

(1), fan installation is divided into axial flow and centrifugal type. Both of them are measured in units, and the quota in the first volume of mechanical equipment installation project is applied according to the form and number of fans respectively, but the main material fee is calculated separately.

② The cost of ventilation equipment (excluding the value of anchor bolts) shall be calculated separately.

(3), fan shock absorption bearing production and installation, with "100 kg" measurement, using equipment to support the subtitle. Shock absorber (rubber plate, rubber basin, or other shock absorber), the quota does not include the amount, calculated according to the construction drawing. Refer to 4.4 1 pump installation calculation.

Nine, dust collector installation

Whether it is CLG, CLS, CLT/A, XLP equation dust collector or horizontal cyclone water film dust collector, CLK, CCJ/A, MC, XCX, XNX, PX and other dust collectors. The quantities are calculated by "sets" and the quota is applied by quality. For the quality of each set, see Article 9 "Ventilation and Air-conditioning Engineering" in Annex I of this quota.