What are the calculation rules for the quantities of roofing and waterproofing works?

The calculation rules of quantities for roofing and waterproofing works are as follows:

A, coil roofing, coated roofing engineering quantity calculation rules and formulas:

1. Calculation rules and formula: the quantity of coiled material roof = horizontal projection area according to the size shown in the figure × roof slope coefficient.

2. Not deducted: the area occupied by chimney, lampblack machine base and air duct on the house.

3. It should be included: the bending parts of the roof, such as parapet, expansion joint and skylight, should be included in the calculation of roof quantities according to the dimensions shown in the figure. If there is no provision in the drawing, the bending part of expansion joint and parapet can be calculated as 250mm, and the bending part of skylight can be calculated as 500 mm

4. No additional calculation: the additional layers, joints, ends, caulking of leveling layer, cold priming oil and base treatment agent of coiled material roof have been included in the quota, and no additional calculation is needed.

Second, the waterproof quantity is calculated according to the following provisions:

1, calculation rules for waterproof layer of building floor and basement-calculated according to the clearance area between main walls;

2. Deduction: highlight the area occupied by ground structures and equipment foundations;

3. Not deducted: the area occupied by columns | stacks | partitions | chimneys and holes within 0.3m2; Note: The vertical height of the joint with the wall is less than 500mm, which is calculated according to the developed area and incorporated into the plane quantities; More than 500mm, according to the facade waterproof layer calculation.

4. The waterproof layer of the structure is calculated according to the actual pavement area, and the holes within 0.30m2 will not be deducted.

The waterproof layer of the facade wall is calculated according to the actual paving area, and the holes within 0.30m2 are not deducted.

Extended data:

art of computation

Drawings have certain rules. In the process of making a budget, it is based on the process of knowing the map, that is, knowing the map to make a map, throwing the map after completion, proving that you know the map and the budget is completed. Therefore, to make a budget, we must understand the map and master a certain order of understanding the map.

First of all, there are several principles to know how to budget:

1, only look at one picture at a time, and try not to look at one picture twice.

2. Control a large amount and adjust a small amount. The budget is based on controlling the total amount and is revised and adjusted with the deepening of the map.

3, first independence, then the whole, mainly means first independence, not mutual deduction, and then complex deductive relationship.

4, from the order of the map:

Underground first, then on the ground;

Structure first, then building;

Indoor first, then outdoor;

First the main body, then the roof and so on.

Secondly, according to the above principles, the map is divided into five parts: underground, main structure, main building, roof and outdoor sporadic, and what is calculated for each part is determined. You can know what you want according to the quota decomposition and calculation rules until you can accurately calculate the engineering quantity. In fact, it's not called reading a picture, but calculating the engineering quantity while looking at the picture. You can know the map by calculating the quantity of completed works.

Finally, summarize the deduction relationship required by the calculation rules, read through the whole picture to see if there are omissions, repeated calculations, calculation errors and so on.

It is best to calculate the installation according to the system from big head to small head, or from small caliber to large caliber. At the same time, all accessories corresponding to the same caliber are listed.

Good map reading ability

Good drawing reading ability requires the ability to quickly establish the spatial impression of components and buildings. Can quickly find the required data through multiple drawings, can find contradictions and errors in drawings, can outline the structure of every detail in your mind and so on.

The representation methods of structural construction drawings, from traditional fascicles to beam-column tables in South China, are introduced in detail, and there are also some common representation methods of drawing by design institutes.

Master the work procedure and subtitle content of quota.

In the process of studying the drawings of various disciplines, we should always understand the intention of the designers and the contents expressed in the drawings, and also understand the design changes that have occurred before construction. Fully grasp the work procedure and subtitle of quota, including content. Only in this way can we accurately decompose the budget, calculate the corresponding engineering quantity, reasonably apply the unit price, and prevent mistakes such as omission, recalculation and wrong set.

Layout calculation

The calculation of engineering quantity should have a clear idea, which part should be calculated first and then which part. The overall arrangement of engineering quantity calculation can improve the calculation efficiency and save a lot of time and energy. For example, according to the length of the center line of the external wall, the related itemized quantities can be calculated.

Deep understanding

There are clear calculation rules for the calculation of engineering quantity, and a thorough understanding of the calculation rules is needed. In the process of checking engineering quantity data, disputes often occur, which are mostly caused by different understanding of calculation rules.

In the process of understanding the calculation rules, we should combine the characteristics of drawings and construction projects with the understanding of the construction process. For example, the final building area of a single-story building, regardless of its height, is calculated according to the horizontal area of the structure periphery above the external wall of the building. However, if the corner is not designed in the design, the construction area shall be calculated according to the horizontal area of the external wall.

be patient and meticulous

The calculation of engineering quantity must be patient and meticulous, and must not be sloppy. Moreover, after an error occurs, the modification is cumbersome. For example, when calculating the foundation cushion, the calculation rules stipulate that the foundation cushion is calculated according to the actual paving volume, and the earthwork calculation method is also adopted when calculating the engineering quantity. That is, the length is calculated according to the center line of the external wall and the net long line of the internal wall, and the width is calculated according to the size shown in the figure.

When the width of cushion is different from that of earthwork, the center line of external wall and the net long line of internal wall will change, which is different from earthwork. However, some cost workers often use the values of the center line of the outer wall and the clear long line of the inner wall calculated by earthwork to calculate the engineering quantity of the cushion, which leads to errors in the foundation cushion.

Good work habits

For example, the customary expression of expressions, the representation of intermediate calculation data, the labeling method on drawings and so on. Because the calculated data needs to be proofread with relevant parties, I also need to proofread and check historical projects, and so on.

Master advanced technology

At present, the application of computers is more popular, and computers have played a great role in consolidated summary calculation, which not only reduces the workload of budget personnel, but also reduces the mistakes of manual calculation. In the calculation process, we need to improve the accuracy of the original data input. For example, it often happens that one or several items are accidentally omitted in the input of the sum formula.

References:

Baidu Encyclopedia-Rules for Calculation of Engineering Quantity