Water supply and sewerage of the business center

Introduction

1 In this section of the project, internal water supply and sewerage systems of the business center were developed, at the address: St. Petersburg, etc. Cosmonauts/Titova St.

2 The design provides for the following systems of internal water supply and sewerage:

- cold water supply;

- fire-fighting water supply;

- hot water supply;

- domestic sewerage;

- internal drains;

- industrial sewerage system.

3 The initial design data are:

- architectural and construction drawings;

- data on water consumers

4 The design was carried out on the basis of the following regulatory documents:

SNiP 2.04.0185 * "Internal water supply and sewerage of buildings";

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";

SanPiN (SP) 2.3.6.107901 "Sanitary and epidemiological requirements for public catering organizations, the manufacture and circulation of food products and food raw materials in them."

GOST 21.101.97 Basic Requirements for Design and Working Documentation.

Source Data

The building is a polyfunctional complex. The building has technical rooms for accommodation of water metering unit, fire-fighting pump stations, ventilation chambers, electric panels .

Water consumption for household and drinking needs is determined in accordance with SNiP 2.04.0185 *.

Water flow rate for internal fire extinguishing of public buildings, volume 25,000 m32 not less than 2 jets, 2.5 l/s for each, according to SNiP 2.04.01. - 85 * (Table 1, Item 2)), and in accordance with Table 3, for the room, up to 6 m high, the fire jet capacity is 2.6 l/s. The final flow rate for internal fire extinguishing is 2 jets of 2.6 l/s.

The supply of cold water to household, fire-fighting and production needs is carried out from the city external network of public water supply. The guaranteed water head at the connection point is 10 m.W.

Hot water supply is carried out from an individual heat station. Domestic wastewater discharge is provided to the external public sewage network without additional treatment. Discharge of rain and meltwater from the roof - into the rain network of communal sewage without additional treatment. Discharge of industrial wastewater (from cafes) - into the external network of domestic municipal sewage through fat separators installed in the well at the outlet.

Selecting an Internal Water Supply System and Scheme

The choice of the internal water supply system is made depending on the technical and economic feasibility, sanitary and hygienic and fire safety requirements. Administrative buildings accept a system of drinking water supply.

The system of internal water supply includes inlets to the building, water metering unit, dilution network, risers, supply to sanitary devices, water collecting, mixing, shutoff and control valves. Steel galvanized pipes are used to supply drinking quality water in networks up to 150 mm in diameter. Connection of pipes is provided by welding, thread or glue.

For this course project, we accept a system of drinking water supply, as well as a dead end water supply scheme with one input and lower routing of main pipelines.

Network Tracing

A well with a diameter of at least 700 mm is provided at the point of connection of the inlet to the external water supply network, in which shutoff valves are placed to turn off the input for repair. Depth of input laying is accepted taking into account depth of urban water supply pipes laying and depth of ground freezing. The inlet is laid with a slope 0.002 towards the external network for emptying the internal water supply. Entry crossing with basement walls is performed in dry soils with a gap of 0.2 m between the pipeline and construction structures .

The water metering unit is located immediately after insertion inside the building at a distance of 0.8 m from the outer wall. When designing a single-input system, a water metering unit with a bypass line is installed, on which a sealed gate valve is installed, which includes, if necessary, passing a fire water pass or removing the water meter for repair and inspection. Shut-off valves are installed before and after the water meter, between the water meter and the second valve of the control and release valve in the direction of movement.

Water risers are placed together with sewage risers and hot water risers in places of the largest water collection. Main water pipelines are laid along the main inner wall or columns at a distance of 100 cm from the basement ceiling. On the main pipelines there is an installation of watering cranes with a diameter of 20 mm, which are located on the outside of the building in niches to a height of 0.3 m from the pavement through 6070 m along the perimeter of the building. Shutoff valve is installed on inner side to turn off watering crane for winter. The supply pipelines from the risers to the sanitary devices are laid at a height of 20 cm above the floor with a slope of 0.0020.005 to the risers and are connected to the fittings of the device by vertical sections.

Fire water supply

Due to the unfavorable conditions of cold water supply from the external water supply (low head) and high water consumption for fire extinguishing, the project provides for separate fire and drinking water supply systems.

At the same time, during the fire extinguishing, the water consumption for household and drinking needs will be 10.3 l/s.

The fire fighting system is solved as follows.

For fire extinguishing, paired fire cranes with a diameter of 50 mm with sleeves 20 m long and fire barrels, the diameter of the tip spray of which is 16 mm, are installed on all floors. At the same time, the free head value of the highest located fire crane for obtaining a compact jet 6 m high should be 10 m.

Due to insufficient guaranteed head at the inlet for the operation of fire fighting devices, the installation of booster pumps is provided in the water supply unit room.

Domestic sewage system

Domestic wastewater discharge is provided to the external public sewage network without additional treatment,

Removal of domestic wastewater from sanitary devices is provided through gravity pipelines, building structures and under the floor of the 1st floor. Install with downward slope towards extension. Hilti attachments are used to secure the pipelines.

Ventilation valves are installed on all risers.

Material of pipelines of domestic sewerage systems - pipelines from polyvinyl chloride sewage pipes of domestic production with a set of standard shaped parts.

To clean the network, it is provided to install revisions and cleans in places convenient for their maintenance. Installation of revisions is provided on the risers of the first floor, at the beginning of the sections (along the flow of drains) of branch pipes with the number of connected devices 3 and more, under which there are no

cleaning devices, at the turns of the network - when changing the direction of flow of drains. In the case of laying sewers under the floor slab at turning points and in straight areas of more than 15 m, cleaning is provided.

Installation of ladders in floor slab is tight. All ladders are equipped with hydraulic locks.

On risers and headers, oblique shaped parts are used, including taps, tees, crosses.

Collector pipelines and risers are isolated from condensate by mineral wool cylinders, Rokwool, 30 mm thick.

Location of ladders and embedded items for pipelines shall be specified before filling the slab.

In order to prevent freezing, the domestic sewage outlet shall be laid in 50 mm thick foam polyethylene shells (Thermaflex type).

Production sewage system.

A separate waste water removal system was designed, equipped with separate releases.

- from production equipment and washing shells and washes, from process rooms;

Production wastewater is discharged from the technological and sanitary equipment of the dining room to the external network of domestic municipal sewage through the fat separator "LABKOEURO REK." Connection of process equipment to the sewage system is provided with air break of at least 20 mm from the top of the receiving funnel embedded in the siphon.

Material of pipelines of industrial sewerage systems - pipes from polyvinyl chloride sewage pipes of domestic production with a set of standard shaped parts.

Horizontal branches of sewage from production premises have devices for cleaning pipes.

Main pipelines and risers are isolated from condensate by mineral wool cylinders, 30 mm thick.

Non-vented sewage risers shall be equipped with vacuum valves. Sewage risers with production drains are laid in production and storage rooms in plastered boxes without revision.

Hilti attachments are used to secure the pipelines.

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