Construction of engineering infrastructure (external water and gas supply networks), intercity road and sidewalks for residential area

Contents

SECTION

1.1 List of the author's team

1.2 Project Chief Engineer Reference

1.3 Composition of the working project

SECTION

2.1 Basis for project development

2.2 Characteristics of the object

2.3 Main Design Solutions

SECTION

3.1 Gas pipelines and structures on them

3.2 Protection of gas pipelines against corrosion

3.3 Environmental measures

3.4 Occupational safety

3.5 Protection of gas distribution networks

3.6 Technical and economic indicators

SECTION

Design Input

SECTION

Graphic material

2.2. Object characteristic

The territory within the boundaries of which the project is being carried out is located between the ends of the pen. Oktyabrskaya and ul. Builders, on the southwestern outskirts of Art. Bagaevskaya, Bagaevsky district, Rostov region. Geomorphologically, the site is located on the I floodplain terrace of the river. Don. The terrain is relatively flat, with a common slope in the north-west direction towards the river. Don.

The construction area has:

- outside air temperature of the coldest five-day period as per SNiP 230199, equal to - 22 ° С;

- standard value of snow cover weight according to SNip 2.01.0785 for I I geographical area equal to 0.84 kPa (84 kgf/m2);

- SNip 2.01.0785 wind head height for the III geographical area is 0.38 kPa (38 kgf/m2).

- Standard depth of seasonal freezing - 0.9 m

.. The source of gas supply of the residential quarter of low-rise buildings is the existing steel above-ground low-pressure gas pipeline (IV katego-rii) Ø 89mm, (exit from the existing GRPSH052U1), located on the street Builders in the station Bagaevskaya, Bagaevsky district of the Rostov region.

Tie-in place - steel overhead low-pressure gas pipeline Ø 89mm, on the street. Builders, exit from the existing GRPSH

Tie-in point pressure as per specification:

- design - 0.003MPa;

- mediafactic - 0.003MPa;

- gas flow rate - 213.5 m ³/h

This project provides for:

- construction of underground low-pressure gas pipelines from GRPP (distribution and gas pipelines-inlets).

The construction site is defined by the design assignment and includes the laying of low-pressure gas pipelines from polyethylene pipes (underground) and steel electric welded pipes (above ground), the installation of a disconnecting device. When designing a gas pipeline from polyethylene pipes, calculations were made to check the strength and deformability of the gas pipeline. The calculation is made taking into account loads from the pipe own weight and loads from the soil pressure.

Within the gas pipeline construction strip, soils of the 1st type of leakage are presented. Groundwater at a depth of 5.0m was not found, water rise is not expected. In its chemism, groundwater is non-aggressive to concrete, but aggressive to materials of reinforced concrete structures and carbon steel structures. The aggressiveness of groundwater, given the use of polyethylene pipes, is almost insignificant.

2.3. Main Design Solutions

In accordance with the requirements of SNiP 42012002 and SP 421032003, the present design provides for the use of polyethylene pipes PE80 GAZ SDR17.6 (C = 2.5) according to GOST R 5083895, electric welded steel according to GOST 1070491 * Art. "V" GOST 1070580, steel water and gas pipelines as per GOST 326275. For cases under category IV roads, the design provides polyethylene pipes PE80 GAZ SDR11 (C = 2.8) as per GOST R 5083895.

The route of the designed gas pipeline is located according to regulatory documents at certain distances from the foundations of buildings and from underground utilities.

The depth of the gas pipeline is 0.91.5 m. The trench width for the gas pipeline diameter is more than 110mm not less than the pipe diameter plus 300mm, and for the gas pipeline diameter is 110mm and less than the pipe diameter plus 200mm The gasket is carried out in an open way.

At the place of tie-in install the disconnecting device of the ball valve 11c67p (seal tightness - class "B" as per GOST 954493).

At the intersection with roads, the gas pipeline should be laid in a case. The ends of the case must be brought to a distance of at least 2 m to both sides of the edge of the road, with sealing of the ends of the case with waterproofing material. At one end of the case, at the upper point of the slope, install a test tube that goes under the protective device (carpet). Cases shall be made of PE80 GAZ SDR11 polyethylene pipes (C = 2.8) as per GOST R 5083895 .

Cross roads and lay protective cases under roads in an open way. The breaking point located on the transport and pedestrian tracks shall be protected by protective fences of the established model, equipped with red position lamps, corresponding temporary road signs, information boards with bypass and bypass symbols agreed with the HBDD.

- to perform the work, choose a period during the day with the least heavy traffic;

before traffic is blocked, develop a trench on sections adjacent to the road on both sides of the road, prepare a protective case and weave for laying, harvest soil, crushed stone, gravel, etc., ensure the presence of reserve equipment and personnel;

- trench development without trench walls attachment with minimum slopes;

- it is forbidden to find people in the trench during the development of the trench.

Turns of linear part of underground gas pipelines in horizontal and vertical planes are performed using cast branches made of polyethylene of factory manufacture.

Quality of welded joints shall be checked by physical control method in accordance with the requirements of SNiP 42012002 and SP 421032003. Connect polyethylene pipes to each other by couplings with embedded electric heaters using welding devices of "Protva" type, etc. Polyethylene pipes shall be welded at ambient temperature from 15 ° C to + 45 ° C.

Connections of polyethylene pipes to steel pipes are made using non-detachable "polyethylene steel" connections, which have a passport or certificate .

When laying gas pipelines in a trench, measures are taken to reduce stress in pipes from temperature changes during operation:

- at the temperature of the pipes (ambient air) above plus 10 ° С, the gas pipeline is laid with a free bend ("snake") with backfilling at the coldest time of day;

- at ambient air temperature below plus 10 ° С, it is possible to lay the gas pipeline rectilinear, including in narrow trenches, and fill the gas pipeline in this case at the warmest time of day. Work on laying of polyethylene gas pipeline should be carried out at ambient temperature not -15 ° С and not higher than + 30 ° С.

The designation of the pipeline route from polyethylene pipes is provided by laying a signal tape along the entire length of the route. Plastic signal tape of yellow colour, not less than 0.2m wide, with indelible inscription "CAUTION! GAZ! "is laid at a distance of 0.2m from the top of the sprinkled polyethylene gas pipeline. At the intersections of the gas pipeline with underground engineering communications, the tape should be laid along the gas pipeline twice at a distance of at least 0.2m between each other and at 2.0m on both sides of the crossed structure.

To determine the location of the gas pipeline at the corners of the route turns, at places of diameter change, installation of valves and structures belonging to the gas pipeline, as well as on rectilinear sections of the route (through 200500m), provide for the installation of identification marks .

Data on the diameter, pressure, depth of the gas pipeline, pipe material, distance to the gas pipeline, structure or characteristic point, etc. are applied to the identification mark.

The identification mark shall be installed on railway columns or metal benchmarks not less than 1.5 m high or other permanent landmarks.

The exit of the gas pipeline from the ground should be covered with sand to the entire depth of the trench. At ground exit install disconnecting device and electrically insulating flange connections.

For protection of the elevated gas pipeline against atmospheric corrosion to paint the gas pipeline enamel in the GOST 1014989 yellow XB125 color * for 2 times on 2 m to layers of primer XC010 of GOST 935581*.

3.1. Gas pipelines and facilities on them

In accordance with the requirements of SNiP 42012002 and SP 421032003, polyethylene PE80 GAZ SDR17.6 (C = 2.5) pipes are provided for use for pro-masonry of underground gas pipelines according to GOST R 5083895.

Laying of designed underground low pressure gas pipeline from PE80 GAS SDR17.6 (C = 2.5) Ø140x8.0 pipes, PE80 GAS SDR17.6 (C = 2.5) Ø 110x6.3 pipes PE80 GAS SDR17.6 (C = 2.5) Ø75x4.3 and PE80 GAS 7.6 2.5 SDR1.6 pipes

Laying of the designed underground gas pipelines inputs to houses from pipes PE80 GAZ of SDR17.6 Ø63x3.6 GOST P 5083895. The design of gas pipelines is determined by the Customer's requirement, since the construction of residential buildings will be carried out after the laying of engineering communications, the construction of roads and the improvement of the territory. Costs for pavement restoration and re-improvement are not provided

At the tie-in place, install a disconnecting device in the above-ground version. Ball steel crane (11c67p), with seal tightness not lower than class "B." Omitting of gas pipelines to the earth to execute from the steel electrowelded pipes Ø159x5.0 VUS in accordance with GOST 1070491 * station B10 in accordance with GOST 1070580, with a weld joint, full-strength to base metal of a pipe. Put the gas pipeline into the ground in cases made of steel insulated pipe Ø219mm TOC, with sealing of the ends of the case with waterproofing material. During the transition from polyethylene to steel in the horizontal section of the gas pipeline-inlet, the connection "polyethylene wavesteel" is located at a distance from the foundation of the gasified building (in the light) of at least 1 m for low-pressure gas pipelines

Discharge of gas pipelines from the ground shall be made of steel electric welded pipes Ø 57x3.0 VUS as per GOST 1070491 * Str. B10 as per GOST 1070580, with a welded joint equal to the main metal of the pipe. The outlets of gas pipelines from the ground, near residential buildings, shall be enclosed in cases of steel insulated VUS pipes Ø 102mm in, with sealing of the ends of the case with waterproofing material. Disconnecting devices with gate tightness not lower than "B" class and electrically insulating flange connections shall be installed at the place of gas pipeline exit from the ground and the outlet of GRPP.

At the crossings of the gas pipeline with roads, lay the gas pipeline in the case of pipes PE80 GAZ SDR11 (C = 2.8) Ø200x18.2 GOST R 5083895 and PE80 GAZ SDR11 (C = 2.8) Ø160x14.5 GOST R 5083895 for low pressure. Bring the ends of the case to a distance of at least 2.0m to both sides of the road, with sealing of the ends of the case with waterproofing material.

At one end of the case, at the upper point of the slope, install a test tube extending under the carpet. The control tube device shall be made according to the 5.90525 series. General data.05

Protect the underground utilities inputs to buildings located in the fifty-meter zone from the gas pipeline axis according to the 5.90526.04 series

3.2. Protection of gas pipelines against corrosion

The pipeline of polyethylene pipes does not require protection. Underground sections of steel gas pipelines have insulation of a "very reinforced" type. "Polyethylene steel" joints (prefabricated only) are laid on the sand base and are made on a horizontal section.

For protection of the elevated gas pipeline against atmospheric corrosion to paint the gas pipeline enamel in the GOST 1014989 yellow XB125 color * for 2 times on 2 m to layers of primer XC010 of GOST 935581*.

3.3. Environmental measures.

The use of gas as a fuel significantly improves sanitary hygiene conditions and cleans the air basin of ash, soot and reduces nitrogen oxides and sulfurous anhydride in the surface atmosphere. The improvement of the atmosphere is achieved by the fact that when burning natural gas in combustion products there is no sulfur anhydride and solid particles (dust, carbon black) and, compared to the use of coal, the content of nitrogen oxide is reduced by 20%.

The gas pipeline is an all-welded structure and is not a source of harmful emissions.

During the construction of the gas pipeline, minor atmospheric pollution occurs during the operation of mobile welding posts and vehicles.

At the same time, modelling of dispersion is not possible due to the mobile mode of work. After completion of construction, sources of release of harmful substances into the atmosphere are eliminated.

This section of the project deals with the protection of the natural environment in terms of the protection of the atmospheric air, soils, reservoirs, flora and fauna, the implementation of a number of measures aimed at preserving the environment and causing it minimal damage during construction:

- rational choice of gas pipeline route ensuring maximum co-storage of green spaces and landscaping;

- use for construction of certified steel pipes with welded joint equal to the pipe base metal; connection of pipes to each other by welding, which eliminates the possibility of gas leaks, with a mandatory test for strength and tightness at the end of installation of the gas pipeline in accordance with

- requirements of SNiP 42.01.2002 and "Rules for safety of gas distribution and gas consumption systems";

- equipping workplaces and construction sites with inventory containers for household and construction waste;

- draining of fuel and lubricants to designated and equipped places for this purpose;

- Compliance with the requirements of local conservation authorities;

- it is forbidden to ignite fires on the highway and on the platforms using smoke fuels;

- during all types of construction and installation works environmental protection measures shall be performed in accordance with the work execution plan.

3.4. Occupational safety

All workers on the route shall be aware of the precautions for purging and testing of the gas pipeline.

When performing works on the construction of the gas pipeline, it is necessary to comply with the requirements of SNiP 11.1-4-80 *, as well as:

- "Fire safety rules for construction and installation works" approved by the State Unitary Enterprise of the Ministry of Internal Affairs;

- current standard safety instructions for the types of work

3.5. Protection of gas distribution networks

In accordance with the Decree of the Government of the Russian Federation No. 878 of 20.11.2000 in order to ensure the safety of gas distribution networks, as well as prevent accidents during their operation, the following procedure for determining the boundaries of protective gas distribution networks should be established:

1. Along the routes of external gas pipelines - in the form of an area limited by conventional lines passing at a distance of two meters on each side of the gas pipeline.

2. Around the separate gas control points - in the form of a territory bounded by a closed line, drawn at a distance of 10 m from the borders of these objects.

3. Distances when determining protection zones are set from the axis

gas pipelines and shall be not less than the required building codes and

rules.

4. Business, works, restrictions (encumbrances)

for the use of land in the protection zone of gas pipelines,

are established in accordance with the "Rules for the protection of gas distributors

networks. "