Reconstruction of the administrative and business center - Leningrad region, Priozersk - sewerage

Water consumption and drainage

General provisions:

The project for the Administrative Business Center facility located at: Leningrad Region, Priozersk St. Kalinina, 51, was developed on the basis of the following materials:

SPb Vodokanal PMT Specification No. 521511010/0901 dated 23.11.2009

Architectural and construction drawings of buildings and structures.

General plan M1: 500.

Engineering and geological survey materials.

SNiP 2.04.0185 * "Internal water supply and sewerage."

SNiP 2.04.0284 "Water supply. External networks and structures. "

SNiP 2.04.0385 "Sewerage. External networks and structures. "

SNiP 2.08.0289 "Public buildings and structures."

Information on existing sources of water supply:

Drinking-quality water supply from the public water supply system is provided from the water supply network with a diameter of 200mm, with its loopback at the PCC Karnaval MUK on the street. Lenin with a water supply network with a diameter of 200mm, on the street Kalinina.

Input data received:

Location - Leningrad region Priozersk st. Kalinina house 51.

1. Purpose of the building - Administrative and business center

2. The number of floors is 3.

3. Ground freezing depth - 1.5 m

4. Hot water supply system - from electric heaters.

5. Existing network diameters:

Public water supply - 200 mm

6. Head in operating networks:

- cold water supply - 25 m of water. St.

Accepted system of internal cold and hot water supply.

Cold water supply of the administrative building (III stage) is carried out from the water metering unit of the administrative building (I stage), which was designed and calculated in the design documentation of the administrative and domestic building (I stage).

The project accepts: a combined drinking and fire-fighting cold water supply system using a simple scheme for supplying water to consumers; hot water supply is provided from 6 accumulating electrical heaters f. "Thermeks 50 SPRV": power, W 2500; volume, L 50; presence of external. Term: is; weight, kg 18; voltage, V 220; operating pressure, atm 0.9 = 9.0 ppm, or analogue, with identical parameters. According to the certificate of electrical equipment, the operating pressure is accepted from 0.5 atm to 6 atm. 0.9 atm is accepted in the design.

In accordance with the design assignment, internal engineering systems are connected to the engineering equipment of the main building of the administrative and business center.

Simple scheme of the combined farm. drinking and fire-fighting cold water supply (inlet - water meter - network and valves) is used if the pressure in the external network is always higher than the pressure required to raise water to the highest and most remote consumer in the building. Due to its simplicity, this scheme is the most common for buildings with a height of 5-6 floors.

Steel galvanized water and gas pipes according to GOST 326275 (for Dy40≤) and steel electric welded galvanized according to GOST 1070491 (for Dy≥50) are adopted for laying of internal water supply networks.

Highways are laid under the ceiling of the first floor. To lower water during repair works, main pipelines are laid with slope 0.002 ~ 0.005 towards water metering unit.

Risers are laid in places of greatest location of sun. instruments (in n. nodes), strictly vertical with a permissible deviation of not more than 2 mm. at 1 m. Pipes.

Vents are laid along the walls at a height of 150100 mm and with a slope of 0.002 ~ 0.005 towards San. device.

Summary of existing internal and external water supply and drainage systems.

Internal drains are installed in the internal drainage system, which will not be dismantled.

The discharge of household and rain effluents is carried out through existing outlets into existing wells, which are installed on the existing sewage network d 150 mm, made of ceramic pipes. Further, drainage is carried out into the existing sewer network d 150 mm on the street. Kalinina.

Water supply is carried out from a water supply network with a diameter of 200 mm with its loopback at the PMDK DC on the street. Lenin with a water supply network with a diameter of 200 mm on the street. Kalinina, into the existing well.

For the existing building of the administrative building (stage I), the estimated costs for internal fire extinguishing are:

2.5 l/s. one jet, PC = 6 pcs.

For the existing building of the administrative building (II stage), the estimated costs for internal fire extinguishing are:

2.5 l/s. one jet, PC = 6 pcs.

Estimated costs for internal fire extinguishing of administrative buildings (I, II stage) are determined on the basis of SNiP 2.04.0185 *.

Automation of fire-fighting water supply.

Fire cranes with a diameter of 50 mm with a fire barrel spray diameter of 16 mm and a hose length of 20 m are accepted, fire alarm buttons are installed next to fire cabinets, when triggered, electrical valves of the water meter bypass fire line open.

Fire water supply system is connected via gate valve on water meter bypass line at the water supply system inlet. Each fire crane is equipped with a fire hose of the same diameter of 20 m and a fire barrel.

Automatic control of the fire water supply system means the start of the fire water supply system at the actual opening of the fire crane. It is necessary to send a signal (light and sound) to the fire station room or other room with round-the-clock stay of maintenance personnel.

For normal operation of water supply facilities, automatic control over the main technological parameters is provided: pressure, water flow rate in water supply networks and inlets, as well as ensuring protection of units from short circuit.

Cold Water Supply Costs

Design cold water flow rates are determined based on SNiP 2.04.0185 * and are as follows:

- for household and drinking needs 1.53 m3/day, 0.83m3/hour; 0.47 l/s.

- at the watering of the territory 3.66 m ³/day.

Design water flow rates for internal fire extinguishing are determined on the basis of SNiP 2.04.0185 * and make up:

2.5 l/s. one jet, PC = 9 pcs.

Accepted internal sewage system.

The sewage system is designed to remove from the building, formed as a result of sanitary and hygienic procedures, economic and industrial activities of a person, as well as atmospheric precipitation.

The domestic sewerage system removes contaminated water after sanitary procedures, as well as faecal effluents.

In the adopted internal sewage system, waste water from the building is discharged through existing outlets to the well of the external sewage network by gravity.

The design provides for polypropylene pipes of PPR f. Wawin, dy110, dy50.

Diameters of domestic sewage risers and outlets according to calculations are taken equal to Dy100 mm.

The design provides for storm sewage risers, according to the calculations, Dy 100mm is accepted.

Slopes of branch pipes at Dy = 100 mm. 0.035 are accepted. The output slope resulting from the capacity calculation is 0.035.

The risers are located in the places of sewage concentration, i.e. in the bathrooms. In this project, the risers are laid open to the sun. nodes.

For cleaning of risers, height inspections shall be provided

1000 mm. from the floor.

The project accepts non-naturally ventilated risers of the sewage system. This is not due to the possibility of removing sewage pipes above the roof. For stable removal of domestic effluents to the riser, an air valve is mounted (at a height of ~ 1.5 m). The vent valve serves to ensure the supply of air to the sewage riser to satisfy the ejection capacity (i.e. the ability to entrain the air) of the liquid moving in it, as well as to prevent the ingress of contaminated air from the external network into the premises.

Cleaning is provided for cleaning of branch pipeline sections at turning points.

Rain and domestic effluents are diverted, through existing outlets, to the existing combined sewage network.

Determination of waste water flow rates.

Estimated expenses of domestic wastewater are determined on the basis of SNiP 2.04.0185 * and make up :

2.72m3/day, 1.47m3/hour, since 0.8 l/s = > then we take 1.6 l/s.

The characteristics of waste water from the building meet the requirements for effluents at the outlet to the public public sewage system.

Emptying of ITR is performed by flexible hose, which is in ITR room for revision.

Hydraulic calculation of internal sewage system.

Hydraulic calculation of internal sewage is carried out in order to determine the cross-sectional area (pipe diameter sufficient for the passage of waste water) by the grade, to determine the amount of filling of the outlets, as well as the speed of flow of waste liquid.

Hydraulic calculation is carried out according to the Lukins tables ("Tables for hydraulic calculation of sewage networks and slopes according to the formula of Academician Pavlovsogo").

Check the capacity of risers.

The sewer risers capacity shall be checked as per Table 8 of SNiP 2.04.0185 *. To do this, the above formulas determine the calculated second flow rate of waste liquid for each riser and are compared with table values, and the diameter of the pipes is selected.

The diameter of the pipes should be taken depending on the diameter of the largest fire outlet and the angle of connection of the branch pipes to the riser.

Verifying the throughput of releases.

To determine the throughput of the outlets, the above formulas determine the second flow rates of the waste liquid using which, according to the Lukin tables, the flow rates of the drains and the filling of the pipes are determined.

Slopes of sewage outlet pipes shall be accepted:

- Dn = 50 mm - i ≥ 0.03

- Dn = 100 mm - i ≥ 0.02

- Dn = 150 mm - i ≥ 0.01

When choosing the exhaust slope, it should be borne in mind that the flow rate of the drains should be at least 0.7 m/s, the filling of the pipes should be at least 0.3 Du.

Operation of internal water supply and sewerage networks.

Maintenance of the internal water supply is carried out by a locksmith, which also serves the sewerage system, city water supply and heating.

Attention should be paid to:

- Water leaks at the water discharge valves.

- Overgrowing of pipes with suspended particles and salt deposits.

- Pipe flow in the room with high humidity.

- Freezing of water in pipelines.

- Noise in pipelines.

Once you have identified the cause of the problem, you must correct it immediately or make an entry in the current activity log.

Clogs in internal sewers and drains most often appear on long horizontal sections and at turning points. If there is no revision or san near the clogging. device, then hole d = 20 ~ 25 mm is made in the pipe. and wire is passed through it. After cleaning, the hole is closed with an elastic sheet, which is pressed against the pipe by a strip of roofing iron and tightened with clamps.

Leaks most often occur in bell joints.

For repair, the connection is disassembled, the old seal is removed, then the bell is sealed with 3-5 turns of the cable, after which it is sealed with cement mortar (for cast iron pipes) or an O-ring (for plastic pipes) is replaced.

The release of gases from the sewer can be due to:

- Due to loopholes in the junction funnels.

- Due to drying of water in the sun. devices, due to the long absence of consumers.