【 Weak current College 】 plumbing and ventilation engineering quality (2)

II. indoor drainage pipe plug

1. construction preparation:

(1) cast iron drainage pipe and pipe fittings, galvanized carbon steel pipe and pipe fittings, specifications should meet the design requirements. The quality of products meet the requirements. Cement has a factory certificate or proof of the retrial. Tsing Ma, MA tidy, is not allowed to have corrupt phenomenon.

(2) interior drainage pipe installation conditions.

Operating conditions:

1) underground drainage pipe laying of the foundation wall must be at or near ± 0 elevation, room heart at the end of the pipe soil backfill or slightly higher level, room location along the pipeline within the heart without accumulation, and pipeline across the building Foundation, has been reserved by design requirements well pipe hole.

2) devices layer drainage pipe laying, should the device layer after dismantling cleanup in the template.

3) floor in drainage piping installation should be separated with the construction of a second layer, and «pipeline crossing structure parts of holes have reserved finished, indoor template or sundries, indoor pop up room dimension lines and accurate horizontal lines. Installation preparation according to design drawings and technology gives the low-down, inspection, checking the reserved hole size dimensions are correct, the pipeline location coordinates, elevation drawing lines position.

2. operation process:

(1) effluent dry pipe installation

1) digging trench or room of subsoil backfill to pipe laying pipe at the bottom level, should be prefabricated pipe segments in Shing better outlet direction towards the water, the water outlet on the Interior. Dig a good twist grey cast with work pit
The prefabricated good segment edged into the trench, closed up strict total outlet, do a temporary support, according to the coordinates of the construction drawings to find a good location, elevation and slope, and reserved the direction of the spout and the center line, connected to the pipe spigot.

2) pipe trench mouth twist ash, the pipe straightening, alignment, use hemp brazing or thin twist drill will even find the spigot of gap, hemp play real, straightening, correction, pipe on both sides with soil, prevent twisting grey cast pipeline.

3) water-cement ratio of 1: 9 of cement mixed with good twist limestone, mounted on ash tray in the lower part, one spigot in the pipeline, cross-filled gray, hand twisted chisel ramming, first fill in the lower part, a bottom-up, side-fill edge ramming, filled with

Hand hammering it, then fill in again, the gray filled break even.

4) twist good gray, wet ropes wrapped moist curing or backfill fine soil cover for conservation.

5) pipe laying twist good gray, then the risers and the first layer of sanitary drainage reserved spout, indoor horizon, coordinates, position and size of the axis to find good, next to the required height, will allow the spout with temporary wire plug.

6) in accordance with the drawings on the laying of pipeline coordinates, elevation and reserved a pipe orifice size for post, after confirming the accuracy of the spout from the reserve Office closed water irrigation done, test after passing the test, and fill out the covert works acceptance records, for subtle works acceptance procedures.

7) pipeline system after acceptance by the subtle, temporary plugging all reserved spout, burying fill plug hole, hole, according to the provisions of the backfill.

(2) install sewage standpipe

1) under the construction drawing proofing reserved tube tunnel size error-free, in the case of precast concrete floor requires chiseling floor holes, cracks should be painted according to the location marked, at the tag tick chisel. If you need to be broken rib, with the construction team, the consent of the persons concerned by the request.

2) standpipe inspection openingsset as designed. If drainage pipes located in the ceiling, should be on every layer of the stack is standpipe inspection openings, for closed water test.

3) installation riser should two up and down, a person in the upper floor, the pipe hole into rope, following one of the pre-made good riser upper part tied to pull the risers beneath the lower Jack into the lower tube socket.

4) riser insert socket, the lower deck of the left and standpipe inspection openings direction alignment, upper with wooden wedges will pipe in the floor hole place temporary card fastness, hemp, hanging straight, twist. Review the standpipe verticality, standpipe temporary fixed firmly.

5) riser after installation is complete, the burying of not less than the concrete floor slab marking will cave filled with blocking it, and remove temporary support. In the case of tall buildings or pipeline well, should follow the design requirements for steel making retention bracket.

6) tall buildings considering pipeline expansion and contraction compensation, can adopt flexible pipe flange, spigot Department to stay out of expansion and contraction compensation allowance.

7) high-rise building using assisted ventilation pipes, can be assisted ventilation shaped pipe connection.

(3) installation of sewage pipes

1) sewage pipes installed, you must meet the standards required by the construction specifications, in conditions not slope allows also to ensure that the branch pipe installation of minimum slope.

2) branches located in the ceiling, the Terminal has sweeping mouth, should be received to the South side of the pipe, easy to clean cut.

3) pipes after installation, the sanitary ware or equipment reserved pipe installation in place, find out the size of the floor hole yan, set aside the spout with temporary wire plug.

3. preventive measures:

(1) promptly blocked sealing ducts of the mouth, to prevent debris thrown out into the pipe wall.

(2) sanitary ware installation check original throw estuary, and took out debris inside the tube.

(3) pipeline installation pipe bore, carefully dredge to remove debris.

(4) keeping the pipeline installation slope there shall be no uniform, down-slope.

(5) drainage pipe standard gradient should conform to the specification. No design requirements, pipe slope should be not less than 1%.

(6) the reasonable use of the parts. Buried pipeline should use TY and y-tee, inappropriate use of t-shaped tee; horizontal cross tube to avoid using four-way; drainage pipe wall and plane sweeping mouth needed two 45 ° elbow connection to stream open.

(7) standpipe inspection openings and plane sweeping mouth installation location should be convenient for maintenance operations.

(8) during the construction, health apparatus of return water bent wire plug best slow-loading, to reduce dirt into the pipeline.