Generally, all underground pipelines are made of PP-R or PVC-U plastic pipes or plastic-lined steel pipes.

1, first count the water supply appliances (such as valves, water meters, etc.) at the water supply entrance and indoors, and make statistics according to different pipe diameters.

2. When calculating the quantities, calculate the main pipe first, then the riser pipe, and finally the branch pipe; According to different pipe diameters, the total amount is added; The variable diameter point is selected where there is a connection pipe or equipment.

3. Under normal circumstances, the outdoor entrance is reserved at 1.5m, and the height of each contact of short riser of water-using equipment (such as washbasin, urinal and washbasin) is considered as 0.3m. ..

4. When calculating the quantity, it is necessary to calculate the casing that passes through the wall and floor. If it is a steel pipe, it is necessary to calculate the weight of the bracket and the derusting and oil brushing area (steel pipes and all plastic pipes below 32 and 32 do not need to be counted as brackets, because they are comprehensive in the quota); For outdoor or underground water supply pipes, the insulation volume should be calculated according to the requirements of drawings.

5. When pricing, generally look at the design instructions. The instructions say what tube to use and what tube to cover; The instructions say that it takes several times to paint; The instructions say what insulation to do and what insulation to set; Finally, flush the pipeline (all drinking water needs to be flushed).

Calculation of main water supply pipe

1, the number of household appliances for water supply (generally according to the standard atlas, if there is no atlas, just follow the number drawn on the drawing, remember the size of household pipes and all household appliances, generally valves, water meters, etc. )

2. The length of different main pipes entering the house = 1.5 (external wall skin is reserved)+the length measured on the main pipe diagram (brick-and-concrete buildings are measured on the first floor ditch diagram, and the main pipes of brick-and-concrete buildings are generally installed in the ditch, while high-rise structures are measured on the underground floor diagram and generally installed under the underground roof).

3. Outdoor 1.5m pipeline excavation (generally, installation and civil construction are carried out by one unit, not counting).

Calculation of water supply riser

1, riser length = 1.5 (elevation of main pipe entering the house)+height of each floor * number of floors (generally, it can be calculated according to the system diagram).

2. Valves on the riser (the valve specifications are the same as those of the riser)

3. The riser passes through the floor casing (the size of the riser casing)

Calculation of water supply branch pipe

1, the length of water supply branch pipe = the length of horizontal section measured from the tube well on the drawing+the height of cushion returning to the ground +0.3* the number of connected water supply equipment (when calculating the water supply branch pipe, it must be calculated separately according to the specifications indicated on the system drawing, which is generally drawn on the water supply and drainage detail drawing).

2. Wall-penetrating casing (generally, there is this casing at the branch pipe connected by the riser in the tube well)

3. The water meter and valve with corresponding specifications connected to the water supply branch pipe (generally, a valve is included in the water meter when the quota is set, and the valve here does not need to be set again).

Water supply project setting quota project

1, water supply pipes of various specifications; 2. Valves of various specifications; 3. Water meters of various specifications; 4, wear floor casing; 5, wall bushing; 6, pipeline flushing; 7. Excavation of outdoor 1.5m water supply pipeline.

Drainage part

Generally, the exhaust pipes below 0.000 and out of the roof adopt cast iron pipes, and those above 0.000 adopt U-PVC plastic drainage pipes.

Drainage engineering is divided into pressure drainage pipeline and non-pressure drainage pipeline. In high-rise buildings, the drainage pipes used to drain the water in underground sump are pressurized drainage pipes, and the drainage pipes used by ordinary people are unpressurized drainage pipes. In high-rise buildings, cast iron drainage pipes are used underground and above ground, so look at the drawings carefully.

1, the number of floor drains should be counted in drainage works, such as washbasins, vegetable basins, toilets and showers. (Generally, the first floor is cast iron floor drain, and the second floor is plastic floor drain, which should be counted separately). If you count washbasins in the water, don't count them, just count them once; There are inspection ports on the drainage pipeline, but they are not included in the calculation (all are considered in the quota); If it is cast iron, it needs rust removal and oil brushing.

2. Generally, the drainage pipe does not follow the water heating gas pipe. Independent, directly discharged into the municipal drainage pipe network; Generally speaking, the first floor and other floors are calculated separately. Cast iron pipes are used below plus or minus 0 and out of the roof, and plastic pipes are generally used above plus or minus 0. Moreover, the first floor is independently arranged outside and is not arranged with other floors; The length of the short drainage riser connected to the toilet is considered as 0.5m, and the specific pipe diameter connected to the toilet is generally equal to 100, and connected to other drainage equipment (see the system diagram for details).

3. Drainage branch pipe: the general toilet is connected to the floor from 50CM below the floor and connected with drainage equipment. (So the short riser is considered as 0.5 m) The kitchen is generally connected from 30CM above the ground, and it is generally considered as 0.3 m if it is too high to come back.

The length of cast iron main pipe and riser is less than 0.

A, the length of the cast iron pipe trunk and riser below 0 = 3m (outdoor reserved)+the dimension from the external wall skin to the riser on the first floor drawing+the elevation of the bottom of the drainage pipe indicated on the system drawing (generally 1.7m).

B, the outdoor earthwork volume of the main drainage pipe is 3m (generally, installation and civil construction are a unit, which is not counted).

Length of drainage plastic riser

Riser length = total height of each riser (height of each layer of each riser * total number of layers) * number of risers.

The length of cast iron pipe protruding from the roof.

The length of cast iron pipe out of the roof = 1m (generally, the length of cast iron pipe out of the roof is 1m, calculated according to the target size on the system drawing) * the number of risers.

Roof cast iron hood is generally calculated as "one" in civil engineering.

Length of drainage branch pipe

The drainage branch pipe shall be calculated separately according to the dimensions indicated on the system diagram. Generally, the diameter of the drain pipe connected to the bathroom is larger, and the diameter of the drain pipe connected to other equipment is smaller. Compare the details of water supply and drainage with the system diagram to calculate the pipes of various specifications.

Length of toilet drainage branch pipe = length of pipes of various specifications measured on the plan +0.5m * number of drainage equipment; Length of kitchen drainage branch pipe = length of pipes of various specifications on the measurement plan +0.3m * number of drainage equipment (generally 1 vegetable washing pool).

Derusting and oil brushing of underground and roof pipelines, and the number of derusting and oil brushing should be found in the hardware manual; If there is a hole for washing the floor on the drawing, it will be calculated.

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