Calculation and quotation of steel structure
2018-09-25 10:54:07 Click：
Part I drawings
Drawings: according to the catalogue of the drawings, check and check the quantity of the drawings and check whether there are any omissions.
Two, construction drawings
1. general deion of design
1.1 construction area, structural form, column spacing, span and structural layout;
1.2 Quantity calculation scope: on the structure, roof, wall, doors and windows, clear bidding quotation range;
1.3 selection of materials and specifications, specifications and technical requirements;
1.4 steel structure paint or coating requirements, fire rating.
2. floor plan, elevation and section:
It can be used to count the engineering quantities of doors and windows, indoor and outdoor steel ladders, roof color plates, lighting panels, wall color panels, roof ventilators, canopy, water pipes, edge-collecting flooding parts, gutters, etc. The materials, specifications and types of each material should be specified in the statistics.
Three, construction drawings
1. general deion of structural design
1.1 Material: Material corresponding to each part (steel column, beam, purlin, support, etc.) such as Q235, Q345, strength grade requirements of high-strength bolts, etc.
1.2 Welding quality requirements: weld quality grade, non-destructive testing requirements, such as joint weld quality grade should reach the first level, requirements of 100% flaw detection, secondary weld 20% flaw detection, involving the calculation of non-destructive testing costs.
1.3 rust removal requirements: manual and power tools rust removal (St), injection or ejection derusting (Sa). Different rust removing grades and rust removing expenses are different.
1.4 Paint (Painting) Requirements: Paint types, brushing times, film thickness, fire prevention grade, fire resistance limit of various parts.
2. floor plan, elevation, section and node detail:
2.1 the following quantities can be calculated in turn:
2.1.1 embedded iron parts include embedded positioning plate, embedded bolts and nuts.
2.1.2 steel column, wind resistant column, steel beam, crane beam;
2.1.3 roof support, tie bar, column support, canopy framework;
2.1.4 roof purlin, wall purlin, roof and wall purlin braces and rods;
2.1.5 In the calculation process, attention should be paid to the calculation of crane beam and column connectors, cushion plate, roof and wall purlin plate, corner brace and steel column, beam connection plate, cable-stayed rod steel sleeve and other engineering quantities, pay attention to statistics of the number of high-strength bolts.
2.2 If the material list is listed in the drawing, the size, specification and quantity of the parts in the table can be checked in turn according to the part numbers listed in the material list, and if there are any undercalculation, omission or miscalculation.
2.3 note whether there are design changes and modifications, supplements, answers and so on.
Four, matters needing attention in the calculation process
1. format for calculation of quantities
1.1 The weight unit of steel structure is kg, the area unit is m2, and the length unit is m. The calculation results are all kept one decimal.
1.2 When calculating the weight of components, the parts of components can be numbered from bottom to top, from left to right, and calculated in this order.
1.3 format of calculation formula:
1.3.1 plate: specification * length * width * quantity
For example - 6 X 500 X 300 X 5, it means that the thickness of the part is 6 mm, the length of the plate is 500 mm, the width is 300 mm, and the quantity is 5 pieces.
The weight formula is 6 x 0.5 x 0.3 x 7.85 * 5=35.3kg
1.3.2 profiles: specifications, length, * number, weight
For example, if L50 *5, L = 3500 m m *5 *3.77, it means 50 m m wide equilateral angle steel, the length is 3500 m m, the quantity is 5 pieces, the specific gravity is 3.77 kg/m.
The weight formula is 3.5 x 5 x 3.77=66.0kg
2. points for attention when calculating size
2.1 pay attention to the elevation value of the indoor and outdoor steel column bottom plate, which is + 0 or other elevation value. When using the elevation value to calculate the length (or height), we should pay special attention not to calculate by + 0.
2.2 For the calculation of the height (or length) of the stiffened plate, purlin corner brace and parapet eave bracket corresponding to the variable H-section member (beam and column), the calculation can be made according to the H-section height of the average beam and column as the base number.
2.3 Roof purlin length, are calculated according to the length, not deducting the gap between purlins, but also pay attention to add gable roof beam length, for example, the axis represents the center line of the roof beam, then: purlin length = axis length + roof beam width.
2.4 In the calculation of wall purlins, attention should be paid to whether the portal columns and beams are double-pinned purlins and whether there are double-pinned purlins in other parts.
The length of the pull rod is calculated by adding 50 mm to each end of the corresponding purlin spacing, and the length of each pull rod is increased by 100 mm.
2.6 about the calculation of flashing parts
2.6.1 Scope of calculation: roof panels, floodboards at the joints of roof trenches and roofs and daughters'walls, floodboards at the joints of gables and roofs, overhead floodboards at the top of parapets, receptacle boards at the corner of walls, endboards around doors and windows, floodboards at the joints of wall panels and brick walls, flooding at the joints of walls and rain sheds Plate and canopy around the canopy. If it is a double deck panel, it is also necessary to calculate the edges of the inner panels and the inner panels of the walls.
2.6.2 About the width of the recessed pan: Generally, the width of the recessed pan can be calculated by 300-400 mm, and the width of the parapet roof and the roof roof can be calculated by 500-700 mm. The actual calculation can be calculated according to the detailed design of the corresponding contact points.
2.7 The webs of beams and columns with variable cross-section are calculated by net weight when bidding, subcontracting settlement and cost calculation, and the webs of beams and columns with variable cross-section are calculated by external rectangle when clearing with Party A. All kinds of connecting boards are calculated according to the external rectangle.
3. part that can not be repeated.
3.1 High-strength bolts: the connection between the column and beam, the connection between the crane beam, is a common two components, can not be calculated once a component.
3.2 Roof support, tie rods, inter-column support: Some construction drawings in the inter-column support diagram shows the roof support part of the layout, and in the calculation of roof support has been calculated, should not be calculated, in this case, the roof support and wall support drawings should be compared.
4. other points to note
4.1 When calculating the specific gravity of profiles, especially H-beam and steel pipe, we must not forget to reduce the thickness of the reduction. For example, when calculating the specific gravity of the steel pipe, do not calculate the round steel and reduce the area occupied by the inner diameter.
4.2 When consulting the proportion of materials on the hardware manual or other information, be sure to see clearly, do not check wrong.
4.3 when calculating the specific gravity of C purlin, it can be calculated according to the expanded area.
4.4 the skeleton of hollow sunlight panels, aluminum plastic panels and other decorative materials should not be omitted.
4.5 All the calculation process, are required to be careful and careful, must not be careless, under normal circumstances, should be calculated twice. It should be remembered that "a little bit wrong, a thousand miles". The accuracy of calculation is low or errors will be made, and the consequences will be very serious. In addition, we should be unscrupulous, open-minded and eager to learn; often go deep into the front line of the project, understand and familiarize with various construction techniques and processes, deepen the impression, and lay the foundation for better budget and settlement work.
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