Working project of external water supply and sewerage networks of the temporary pavilion of the cafe

External water supply and sewerage networks

General provisions

This working design of outdoor water supply and sewerage of the temporary pavilion of the cafe was developed on the basis of the following materials:

-SNiP 2.04.0284 * "Water supply. External networks and structures, "

-SNiP 2.04.0385 "Sewerage. External networks and structures, "

-SNiP 2.04.0185 * "Internal water supply and sewerage of buildings,"

-SNI8980 * "Industrial Master Plans,"

-GOST 21.60179 "Design Documentation System for Construction. Water supply and sewerage, "

-902-09-22.84 "Sewage wells. Typical Design Solutions, "

-GOST 363489 "Cast iron manholes for inspection wells,"

-GOST 802090 "Products for inspection water supply and sewerage networks,"

-series 3.001.1-3 "Stops on external pressure pipelines of water supply and sewerage system. Typical structures and details of buildings and structures, "

- B2587106544TK "Album of checklists",

-Production rules for St. Petersburg approved by LGI Decision No. 526 dated 17.07.1978.

The design provides for the following systems:

- domestic drinking water supply,

- domestic sewerage system,

General alloy sewer.

Construction Site Organization

On the territory of the construction site install signs of passages and passages.

"Hazardous areas" shall be fenced and warning signs and inscriptions visible at any time of the day shall be displayed along their border.

Substantiation of methods of production of main types of construction and installation works

Prior to commencement of works, there shall be:

1. Permission to perform the specified works in accordance with the established procedure has been received.

2. A commission was convened from representatives of operating organizations, which are responsible for networks and structures falling into the construction zone.

3. All works shall be performed in accordance with the requirements of regulatory documents, including SNiPov for earthworks, installation of pipelines, safety in construction, etc.

The project provides for the development of soil in trenches by an excavator "reverse shovel" with a ladle capacity of 0.5 m. The developed soil is stored in a temporary dump for a distance of up to 10 km in the volume of backfilling. Excess soil is taken to landfill.

Refinement of the trench bottom is carried out manually with loading of soil into taverns, lifting, loading into dump trucks and removal to landfill.

Manual soil development is carried out at points of connection, when crossing with existing underground communications.

To carry out performance of work under protection of fastening of walls of ditches tongue-and-groove boards with a depth up to 4 m (item 8.8.6 of the Album of the checklists B2587106544TK). In the process of works, do not allow freezing, soils thawing and long-term dynamic loads on these soils.

Base for pipes and structures shall be accepted:

for pipes - sand preparation 20 cm;

under the wells - crushed stone 20 cm.

Backfilling of the trench in the lawn is performed with sand 0.5 m above the top of the pipe, the rest is filled with soil from the dump. Backfilled soil is compacted by layer-by-layer pneumatic compaction to standard value (0.98). Backfilling in the roadway is completely performed by sand with layer-by-layer compaction.

In case of trench excision in case of detection of poor-quality soils, it is necessary to commission, together with the Customer, to resolve the issue of their replacement.

The project also provides for:

- washing of water supply networks with hypochlorite solution for 24 hours with active chlorine concentration of 25 mg/l

- due to aggressiveness of groundwater, it is provided to coat railway products with bitumen-rubber mastic in 2 times.

During the construction of water supply networks in accordance with Item 7.7 of SNiP 3.01.0185 * and Item 3.17 of SNiP 3.05.0485 *, acts of inspection of hidden works are drawn up for the following types of work:

- laying of pipes with fixing of clearance value, sealing of butt joints, installation of chambers and wells on the finished base with information on sealing of pipeline passage points through the walls of wells and chambers;

- backfilling of trenches.

- hydraulic tests are performed by setting the pipeline to operating pressure.

Provision of construction with material resources

The delivery of building materials and structures to the site is provided for by vehicles centrally.

The general construction demand for basic materials, semi-finished products and structures is determined in accordance with the scope of work according to the current standards and SNiP.

The need for basic machines and mechanisms is determined on the basis of the planned methods of work, volumes, construction dates and according to the schedule of the need for basic construction machines and mechanisms.

Environmental conditions

The main work methods are developed taking into account hydrogeological conditions, production technology, specific features of the construction site, taking into account the requirements of regulatory documents.

The construction of the networks will be accompanied by various types of impacts on the soil cover.

The sources of influence on the soil during the construction period will be construction and transport machines and mechanisms.

At the same time, the negative impact may be:

- destruction of natural soil cover as a result of earthworks;

- landfilling and contamination of the soil surface with waste materials, household garbage, etc.

In order to prevent pollution of the territory, special measures are needed to dispose of waste during construction.

To protect land during construction, it is necessary to:

- maximum use of the existing engineering infrastructure for construction in one technical corridor, namely: roads, crossings and temporary construction sites, which will reduce the area of ​ ​ temporary land removal;

- application of maximum possible measures to reduce the amount of waste and losses in construction ;

- cleaning of the territory from construction debris;

- prohibition of temporary storage of construction materials in places not equipped with a hard coating.

After the construction is completed, the damaged improvement of the territory is restored.

To monitor the state of the air in the construction area, measures should be taken to reduce emissions of pollutants into the atmosphere.

Air emissions reduction activities include:

- monitoring of equipment operation during the period of forced outage or technical interruption in operation;

- parking of equipment during this period is allowed only when the engine is not operating

-control the exact observance of construction technology,

- application of closed transportation and unloading of building materials related to air pollution,

- dispersal of construction machines and mechanisms not involved in a single continuous process,

- provision of preventive repair of diesel mechanisms,

- regular monitoring of waste gas toxicity in accordance with GOST 2.02.0384 and GOST 2139375 *.

The following shall be provided for noise protection:

- performance of works only in daytime, with complete prohibition of work at night; arrangement of working machines on the construction site taking into account mutual soundproofing and natural barriers,

- preventive repair of mechanisms.

During construction works, the following types of waste are generated:

- asphalt concrete scrap,

- scrap of reinforced concrete,

- metal scrap,

- welding electrodes bounding,

- household waste from life activities of people.

The following measures are needed to reduce the environmental impact of waste:

- regular transportation of construction materials as construction progresses,

- temporary storage of construction materials and waste on the territory of the construction site in specially equipped places,

- availability of a metal container for domestic waste collection on the territory of the construction site,

- obligatory removal and subsequent disposal of construction waste, conclusion of an agreement between the contracting organization and production waste processing units.

Domestic drinking water supply

The water supply system is designed to provide household and drinking needs.

According to the specifications of the State Unitary Enterprise "Vodokanal of St. Petersburg," the water consumption for household and drinking needs is 4.8 m3/day.

External fire extinguishing is provided from fire hydrants located on the utility water supply network. The water flow rate for external fire extinguishing is - 10 l/s.

The source of water supply is a dead end water supply network with a diameter of 300 mm along the South Highway.

The design envisages the device of water supply from LPA PE100 SDR17 PN10 pipes of 63 mm diameter with installation of Hawle DN 50 gate valve with rod in the carpet.

Hot water supply at the wash will be carried out from the network of drinking water supply with heating of water by electric boilers.

The guaranteed head at the connection point is 28 m.v. The required head for household and drinking needs is 10 m.v.

For accounting of the consumed amount of water on input the water-measuring Ι50 node sch.20 according to standard drawings of CIRV 02A.00.00.00 sheet 16, 17 is established. In accordance with the "Rules for the use of public water supply and sewerage systems in the Russian Federation," artificial or natural lighting should be provided in the premises of the water metering station, the air temperature in winter should not be lower than + 5 ° C, and access to the water metering station should also be limited.

The water metering unit is selected in accordance with the expenses given in the balance table of water consumption and water disposal. The diameter of the conditional passage of the water meter should be selected based on the average hourly flow rate of water for the consumption period, which should not exceed the operational one accepted as per Table 4 * SNiP 2.04.0185 *, and checked according to the instructions of item 11.3 * SNiP 2.04.0185 *.

Head losses in the counter are determined by the formula: h = Sq2

where:

S - hydraulic resistance of the counter, accepted in accordance with table 4 * SNiP 2.04.01-85 *

q - total water consumption l/s

On the household line: h = Sq2 = 5.18 * 0.162 = 0.13 m.v., therefore, the counter is selected correctly, since the head loss for wing water meters does not exceed 5 m.

Domestic sewage system

The system is designed to discharge domestic waste water.

Domestic wastewater discharge is 4.8 m3/day.

Domestic wastewater is diverted by two designed outlets with a diameter of 110 mm to wells No. 1 and No. 3 of the designed on-site domestic sewage network with a diameter of 110, 160 mm, then domestic wastewater is discharged to the inspection well No. 221 of the general alloy sewage network with a diameter of 1200 mm.

External sewerage networks are provided from PVC pipes with a diameter of d = 110 mm and PP "PRAGMA" d = 160 mm with the installation of reinforced concrete wells.

The design provides for the installation of a fat separator (No. 2), a well with an MVV shutoff gate valve with a diameter of 150 mm (No. 4) and a control well (No. 5).

Waterproofing of sewage wells shall be performed in accordance with typical design solutions 9020922.84 "Sewage wells" by coating the wells with bitumen in two layers.

General Alloy Sewer

In accordance with the specifications of the St. Petersburg Vodokanal State Unitary Enterprise, the project provides for the removal of a 200 mm diameter sewage network, which is not under the management of the St. Petersburg Vodokanal State Unitary Enterprise, from under the "spot" of development. External networks of the general alloy sewage system are provided from the pipes of the PP "PRAGMA" d = 250 mm with the installation of reinforced concrete wells. The design provides for the installation of an inspection well (No. 6) and a differential well (No. 7). Plug the area of the sewerage network with diameter of 200 mm from the inspection well (No. 6) to the well No. 221 .

Waste water is discharged to the well No. 221a of the communal network of the general alloy sewage system with a diameter of 1200 mm.

Waterproofing of sewage wells shall be performed in accordance with typical design solutions 9020922.84 "Sewage wells" by coating the wells with bitumen in two layers.

Rain runoff

Surface water discharge is 1.76 l/s.

Surface water is diverted from the roof along the natural slope of the area to the nearest rainwater well No. 173 on the storm street sewage network.

Work Notes

When laying pipes in bulk soil, remove the sandstones mixed with peat lying in the pipe base to the full depth and replace it with a sand cushion, which should be made with careful layer-by-layer compaction.

Nets are laid at a depth of at least 1.2 m from the surface of the earth.

In the course of works at crossing with the existing underground communications, the development of soil by a mechanized method is allowed at a distance of at least 2 m from the side wall and not more than 1 m above the top of the pipe, cable, etc. The soil left after mechanized development must be completed manually, while measures should be taken to prevent the possibility of damage to these communications.

Waterproofing of sewage wells shall be performed in accordance with typical design solutions 9020922.84 "Sewage wells" by coating the wells with bitumen in two layers.

Perform sealing of sewage and water supply outlets at the points of passage through the foundation.

Prior to commencement of works, clarify the actual position and purpose of existing underground utilities.

Installation, testing and acceptance of plumbing systems shall be performed in accordance with SNiPom 3.05.0185 * and installation instructions for equipment and pipes.

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