Indoor cast iron drainage pipe installation technology

1 scope

The standard is suitable for civil and industrial indoor cast iron drainage pipe installation works.

2 construction preparation

2.1 materials requirements:

2.1.1 cast iron drainage pipes and fittings specifications, the design requirements. Grey cast iron pipe of uniform wall thickness, smooth and clean inside and outside, without floating sand, sand, sand, trachoma, crack is not allowed, the fin and knots. Socket inner and outer diameter and pipe fittings of a regular shape, smooth smooth tight flange interface, floor drain and return water to withhold margin must be consistent, no offset clasp, clasp, square buckle, threads are not congruent.

2.1.2 galvanized carbon steel pipe and fittings-wall galvanized inside and outside evenly, no rust, no fin on the inside wall, pipe offset clasp, clasp, square buckle, clasp, angles and so on.

2.1.3 Qing Ma, Yau Ma Tei to be neat, not allowed to decay. Asphalt paint, anti-rust paint, Matt and silver must have a factory certificate.

Cement 2.1.4 General No. 325, cement, there must be a factory certificate or re-testing prove that.

2.1.5 other materials: gasoline, oil, glue Pi Bu, electric welding rod, steel, bolts, nuts, wire, etc.

2.2 the main tools:

2.2.1 machine: Threading machine, welding machine, bench drills, impact drills, hammers, grinders, etc.

2.2.2 tools: Threading plate, hammer, hammer, hand saw, broken pipe, cold chisel, screw driver, MA solder, pressure, bench vise, pipe-Cone and cars and so on.

2.2.3 other: spirit level, wire pendant, steel tape measure, a small line.

2.3 operating conditions:

2.3.1 laying drainage pipe must be in the foundation wall at or close to the elevation of ± 0, House soil backfill to pipes or slightly higher altitude, room along a location within the heart no debris and piping through the Foundation Office, according to design demands reserve pipe hole.

2.3.2 equipment within the laying of drainage pipes, should be removed after cleaning the equipment within the template.

2.3.3 drainage pipe installation in the floor, should be separated from the construction of a two-tier, and pipe holes have been reserved across the structure is completed, Interior templates or debris cleared, the indoor pop up room size and accurate horizontal lines.

3 operational processes

3.1 process:

Trunk sewers sewage standpipe installation → setup → sewage pipe installation

Install piping prefabrication → → irrigation experiment

Rain water pipe installation → → rainwater riser installed rainwater pipe installation

3.2 installation preparation: in accordance with the designs and technology to give the low-down, check for proper hole size, check reservations, location coordinates, elevation of the pipe line locating.

3.3 piping prefabrication:

3.3.1 in order to reduce twisting fixed gray during installation, some pipe and fittings may advance by surveying and mapping plans for twisting gray, and number code on the flat ground, using timber pad gasket below the pipe segment.

3.3.2 twisting gray prefabricated pipe sections, gray to conservation, in General, can be wet hemp rope twisted gray, water conservation, and keep moist. Winter anti-freezing measures to be taken, usually at room temperature 24~48h can only moved, delivered to the site installation.

3.4 dry pipe installations:

3.4.1 plumbing installation:

3.4.1.1 in the dug trench or soil backfill to pipes elevation at the end of the laying of pipe, prefabricated pipe sections should be in accordance with the socket towards the water direction, from the outlet to the Interior sequence. Dig twisted gray pit, slowly in a prefabricated pipe into the trench, enclosing block total outlets, temporary support, according to the drawings of finding a good location coordinates, elevation and slope, and the direction and the center line of the reserve pipe, the pipe segment connected to the socket.

3.4.1.2 twist grey in a trench in front of first pipes straightening, alignment, brazing gap thin screw driver or socket to find uniform, real hemp, straightening, correction, good soil for pipeline on both sides to prevent twisting when gray piping shift.

3.4.1.3 will w/c for 1:9 of cement twist mouth gray mix good Hou, loaded in gray disc within put in bearing Jack lower, people across in pipeline Shang, hand fill gray, hand with twist chisel pound real, first fill lower, by Xia and Shang, side fill into pound real, fill Hou with hammer playing real, again fill again playing, will gray mouth playing full playing flat weizhi.

3.4.1.4 twisting gray, wet hemp rope wrapped maintenance or backfill moist soil cover maintenance.

3.4.1.5 pipeline after twisting gray, then the State reserved first floor, pipes and sanitary drainage pipe, indoor horizon, the coordinate axis of the location and find a good size, minimum height reserve tube install temporary plugs.

3.4.1.6 paved according to the construction pipeline coordinates, elevation and admitted to the nozzle size performing a self-test, after confirming the correct pipe irrigation water from the reserved test full observation of water level does not drop, the interface and pipeline leaks, check by the persons concerned, and fill in the acceptance of concealed work records for the acceptance of concealed work procedures.

3.4.1.7 the piping system with concealed upon the acceptance of temporary plugging the reserve pipe, with the construction hole ring gaskets, holes, the required backfill.

3.4.2 supporting, suspended pipe installation:

3.4.2.1 install cast iron drainage pipes in the plumbing layer can be designed according to the needs supporting, hanging or masonry piers erected.

3.4.2.2 installation supporting, and hanging dry tube to first erection shelf, will Bay by design slope planted good or planted good hanging card, volume associate hanging stick size, will prefabricated good of pipeline supporting, and hanging firm, and will state tube reserved mouth location and the first layer health ware of drainage reserved tube mouth, by indoor horizon, and coordinates location and the axis find good size, received to provides height, will reserved tube mouth loaded Shang temporary silk blocking.

3.4.2.3 hold, hang-dry pipe in the ceiling, closed water test needs to be done, according to covert projects for the hidden check procedures.

3.5 vertical pipe installation:

3.5.1 in accordance with construction drawing proof reserve tube hole size there is no error, you need to pick your cut in case of precast concrete slab floor hole, draw should be well marked, at the rejection of chiseled-marks. If you need to cut, requires the consent of the civil construction Corps consent of the person concerned, according to the specified requirements.

3.5.2 standpipe inspection openings set according to design requirements. Such as drain pipes located in the ceiling should be on each floor are installed on the standpipe standpipe inspection openings to allow for irrigation experiment.

3.5.3 install standpipe should be two people meet, one in a layer on the floor by tube inside the cave, we dropped a rope end, the following one will be good on the standpipe half tied and pulled beneath the standpipe socket insert under the lower tube in the socket.

3.5.4 after insert the standpipe socket, people of the lower estuary standpipe inspection openings left alignment, the pipe in the floor with a wedge from the top hole temporary card, and stamping, hanging straight, twisted grey. Review the verticality of the standpipe, riser temporary fixation.

3.5.5 pipe after installation, coupled with civil use below grade concrete floor slab will fill the hole plugging real and remove temporary support. Case of high-rise buildings or pipe shaft should be in accordance with design requirements using steel fixing bracket.

3.5.6 high-rise building considering pipeline expansion and contraction compensation, use the flange of flexible pipe (Figure 1-8), but the spigot to allow expansion and contraction compensation allowances.

3.5.7 high-rise building using Auxiliary ventilation tubes, special-shaped pipe connection with auxiliary ventilation (figure l-9).

3.6 install sewage pipes:

3.6.1 support tube installation should first take good shelf, and will Bay by slope planted good, or planted good hanging card, volume associate hanging stick size, will prefabricated good of pipeline supporting to shelf Shang, again will support tube insert State tube reserved mouth of bearing mouth within, will support tube reserved mouth size find associate, and fixed good support tube, then playing Ma, and twist gray mouth.

3.6.2 branch pipe located in the ceiling, clean out the end should be on the tube to the upper ground, easy to clear out.

3.6.3 pipe after installation, sanitary ware or equipment can be reserved tube installed, find size and coordinate civil floor hole plugging, and reserve tube install temporary plugs.

3.7 drainage installation:

3.7.1 rainwater pipe installation, pipe pressure according to the design requirements must be considered.

3.7.2 storm drain pipe inside a high-rise building using rare-earth iron drain pipe, pipe pressure up to 0.8MPa or more. Pipe lengths according to the height of floors, each floor takes only a root canal, twisting a cement gray.

3.7.3 use cast iron pipe installation, the installation method with the indoor drain pipe installation.

3.7.4 rain funnel connecting pipes should be fixed on the roof structure. Rainwater funnels should be closely connected to the edge of the roof does not leak.

3.7.5 storm sewer installation, irrigation experiment should be done, per riser height must be uppermost rainwater hopper.

4 quality criteria

4.1 project:

4.1.1 hidden sewer water test results must comply with the design requirements and construction specifications.

Inspection methods: inspection zone (above) water test records.

4.1.2 the slope must conform to the design or construction of the pipeline specification.

Inspection method: check concealed work record or level (level), the cable and check.

4.1.3 the piping and pipe support (Tun) laying on the permafrost and untreated soil is strictly prohibited.

Test method: observation of concealed works of checks or check the record.

4.1.4 the water test results after the completion of the drainage system, provision must comply with the design requirements and specifications.

Inspection method: water check or check water test records.

4.2 Basic project:

4.2.1 socket and coupling interface of metal pipe shall conform to the following provisions: interface architecture and the packing provisions comply with the design requirements and specifications, twist compact, full, uniform annular gap, ash flat, smooth, good conservation. Support and hanger spacing shall not exceed 2m.

Inspection method: standard and using hammer tapping to check.

4.2.2 the piping (crane, Torr) and socket (Tun) installation shall conform to the following provisions: constructed correctly, laying laying strong, neat, brackets and pipe in close contact.

Inspection method: observation and hand checks.

4.2.3 the piping and metal stent coating shall conform to the following requirements: paint type and brushing a few times to meet design requirements, good, no peeling, blistering and missing coating, coating thickness uniformity, consistent color, flow and pollution-free.

Inspection method: Visual check.

4.3 allowable deviation:

Installation of indoor drainage pipeline tolerances and inspection methods shall conform to the provisions of l-8.

A drainage pipe installation method for the determination of tolerances and table 1-8

Project tolerance (mm) method

1 coordinates 15

2 elevation ± 15

Each 1M 1 level (the water

Horizontal pipe length (25m and above) is not greater than 25 square feet), straight

Longitudinal, diameter less than or equal to 100mm 0.5 foot, cable and

Transverse direction of carbon pipe diameter greater than 100mm 1 ' check

Bends pipe diameter in length is less than or equal to 100mm is not greater than 13

(25m) diameters greater than 100mm is not greater than 25

1M 3

Seat tube length (5M and above) is not more than 15 hanging wire and

Vertical carbon per 1M 2 foot check

Pipe length (5M and above) is not more than 10

5 finished product protection

5.1 is temporary plug nozzle should not be opened to prevent falling into the debris caused by the pipe plug.

5.2 when the backfill soil, laid the pipes are covered with fine soil and compacted layer by layer, not in the upper part of the pipe with leapfrog machinery such as rammed earth.

5.3 good pipe neatly, mat, mat firmly but not stamped or pressed or double flat.

5.4 no install support, putting up shelves or hanging the line tie hanging items, vertical piping to be done at every floor steel bracket.

5.5 construction twisted gray winter anti-freezing measures must be taken.

6 quality problems to be noticed

6.1 State, the branch pipe from the wall too far or too close to half the half darkness, resulting in reduced space, maintenance inconvenient. Mainly pipe installation improper positioning or wall displacement.

6.2 tilt drain plug, causing gray leaks because the provision allowed, gray gap is not uniform.

6.3 high or low floor drain installation, use. Find flooring under horizontal line, dimensions.

6.4 standpipe inspection openings seepage and leakage. Check the closure must be padded to prevent leakage.

6.5 sanitary drain reserves from the high or low. Due to the elevation didn't find out, or cutting scale is incorrect.

6.6 drainage pipe slope is too small or inverted slope, all affect the results, all kinds of pipe slope must be according to the design requirements, such as when there is no requirement, reference table 1-9 requirements for installation.

6.7 pipes through walls, and the Foundation should be installed in the figure 1-10. Vertical discharge pipe and pipe connections should use two 45 ° elbows or bending radius not less than 4 times the diameter of 90 ° elbow, or pipe easy to plug.