Matters needing attention during the calculation process

 

1. About the format of engineering quantity calculation

 

1.1 The weight of the steel structure is kg, the unit of the area is m2, and the unit of length is m. The calculation result retains one decimal place.

 

1.2 When calculating the weight of a component, the components of the component can be numbered from bottom to top and left to right, and calculated in this order.

 

1.3 Computational format:

 

1.3.1 Sheet: Specification × Length × Width × Quantity

 

For example, -6×500×300×5, indicating that the part has a plate thickness of δ=6 mm, the plate length is 500 mm, the width is 300 mm, and the number is five.

 

The weight calculation formula is: 6 × 0.5 × 0.3 × 7.85 × 5 = 35.3 kg

 

1.3.2 Profile: specification, length × quantity × specific gravity

 

For example, L50×5, L=3500mm×5×3.77, representing an equilateral angle steel with a limb width of 50mm, the length is 3500mm, the number is 5 pieces, and the specific gravity is 3.77kg/m.

 

The weight calculation formula is: 3.5×5×3.77=66.0kg

 

2. Points to note when calculating dimensions

 

2.1 Note that the indoor and outdoor, steel column bottom plate elevation value is ± 0.00 or other elevation values. When calculating the length (or height) with the elevation value, special care should be taken not to calculate ±0.00.

 

2.2 The calculation of the height (or length) of the stiffener, the truss truss, and the parapetal truss bracket corresponding to the variable H-section members (beams and columns) can be calculated based on the average height of the H-section of the beam and column. .

 

2.3 The length of the roofing rafters is calculated according to the length of the road. The gap between the rafters is not deducted. In addition, the length of the rafters occupied by the roof girders should be added. For example, the axis indicates the centerline of the roof girders. Length = axis length + roof beam width.

 

2.4 For the calculation of wall purlins, it should be noted whether the door post and the door beam are double-split strips, and whether there are double-split strips in other parts.

 

2.5 The length of the drawbar is calculated by adding 50mm to each end of the corresponding beam spacing, and the length of each tie rod is increased by 100mm.

 

2.6 Calculation of the over-water fittings

 

2.6.1 Calculation range: the slab cover, the flooding plate at the interface between the gutter and the roof panel and the parapet wall, the flooding plate at the interface between the gable and the roof panel, the top of the water on the wall of the daughter, and the corner of the wall. The edge board, the edge board around the door and window, the flood board at the junction of the wall panel and the brick wall, the flood board at the junction of the wall and the canopy, and the edge board around the canopy. If it is a double-layer board, calculate the edge parts at the interfaces of the inner panel and the inner panel of the wall.

 

2.6.2 About the width of the edged flooding plate: Under normal circumstances, the unfolding width of the edged flooding member can be calculated from 300~400mm, and the expanded width of the daughter wall pressing top and the roof slab is calculated according to 500~700mm. In actual calculation, it can be calculated according to the corresponding joint detail of the design.

 

2.7 The webs of variable-section beams and columns shall be calculated according to the net weight when bidding, subcontracting and cost calculation, and shall be calculated according to the external rectangle when handling settlement with Party A. The various connecting plates are calculated according to the circumscribed rectangle.

 

3. The part that cannot be repeated

 

3.1 High-strength bolts: The connection between the column beams and the connection between the crane beams is shared by the two members and cannot be calculated once for one member.

 

3.2 Roof support, tie rods, and inter-column support: Some construction drawings indicate the partial arrangement of the roof support on the inter-column support map, and have been calculated when calculating the roof support, and should not be calculated again. In the case, look at the drawings of the roof support and the wall support.

 

4. Other matters needing attention

 

4.1 When calculating the specific gravity of the profile, especially the H-section steel and steel pipe, do not forget to reduce the thickness of the reduction. For example, when calculating the specific gravity of a steel pipe, do not calculate it as round steel, and subtract the area occupied by the inner diameter.

 

4.2 When looking at the proportion of materials on the hardware manual or other materials, be sure to check clearly, do not check the error.

 

4.3 When calculating the specific gravity of the C-type purlin, it can be calculated according to the expanded area.

 

4.4 The skeleton of hollow sun panels, aluminum-plastic panels and other decorative surface materials should not be missed.

 

4.5 All calculations are required to be carefully and carefully. Don't be sloppy. Under normal circumstances, two calculations should be performed. It should be remembered that "there is nothing wrong with it, and it is a thousand miles". The calculation accuracy is low or the error is wrong, and the consequences will be very serious. In addition, it is necessary to be ashamed to ask, humbly and eager to learn; often go deep into the first line of engineering, understand and familiar with various construction techniques and processes, deepen the impression, and lay the foundation for better pre-clearing work.