2 Material acceptance
1) The specifications and varieties of cast iron pipes and fittings for water supply shall meet the design requirements, with uniform wall thickness, smooth and tidy inside and outside, and no sand holes, cracks, flying thorns and bumps. Socket and pipe fittings have regular internal and external diameters, qualified dimensions and factory certificates. 5, pipeline hydrostatic test and disinfection
1) It is generally stipulated that (1) water pressure test should be conducted before backfilling.
(2) Pipes connected by adhesive must be subjected to hydrostatic test after adhesive installation for 24 hours.
(3) For cast iron pipes with threaded joints, they should be fully soaked under the condition of not exceeding the working pressure before pressure test, and the soaking time should meet the requirements.
The following provisions:
No cement mortar lining, not less than 24h；;
Cement mortar lining, not less than 48h.
(4) Before the water pressure test, effective fixing and protection measures should be taken for the pressure test section, but the joint parts must be exposed. When the socket is used for water casting
When the diameter of the iron pipe is not more than 350mm and the test pressure is not more than 1.0Mpa, there is no need to support the elbow or tee.
(5) Generally, the length of the water pressure test section should not exceed 1000m, and the pressure test should be carried out in sections after the pipe fittings reach the strength.
(6) The pressure test pipe section shall not be blocked by gate valves, and shall not be connected with accessories such as fire hydrants and water pump adapters.
Set baffle, and all kinds of valves should be open during pressure test. (7) Before and after the pipeline hydrostatic test, the water source introduction and drainage route must be designed.
(8) Pipeline irrigation should be poured slowly from downstream. When pouring, exhaust valves should be set at the top of the upstream pipe of the test pipe section and the convex points in the pipe section to eliminate the gas in the pipe.
(9) Anti-freezing measures should be taken for water pressure test in winter. Release water in time after pressure test.
(10) The pressure gauges used for water pressure test shall be calibrated. The accuracy of the spring pressure gauges shall be no less than 1.5, the maximum range shall be 1.3 ~ 1.5 times of the test pressure, and the nominal diameter of the shell shall be no less than 150mm, and there shall be at least two pressure gauges. 2) The pressure test and disinfection procedures are as follows: (1) According to the relevant procedures of this standard, lay and connect the test pipeline and water inlet pipe section, and install valves, pressure test pumps and pressure gauges. (Hydrostatic test scheme shall be prepared for specific layout)
(2) slowly add water. After flushing, all air in the pipe should be exhausted.
(3) After the air is exhausted, close the check valve, slowly pressurize it, first rise to the working pressure for inspection, then rise to the pressure test pressure for observation, and then drop to the working pressure to read the meter. Those that meet the quality standards of this standard are qualified.
(4) In the process of boosting, if it is found that the pointer of the spring pressure gauge swings unsteadily and the gas is not exhausted due to slow boosting, it should be re-vented before boosting. (5) During the pressure test, if any leakage is found in the interface during all inspections, it should be clearly marked. After the pressure drops to zero, repair measures should be made to carry out comprehensive repair, and then the test should be carried out again until it is qualified. (6) After passing the test, rinse. After the flushing is qualified, the acceptance formalities shall be handled immediately, and backfilling shall be organized.
(7) Before the newly-built outdoor water supply pipeline is connected to the indoor pipeline, the indoor and outdoor pipelines can only be connected after they are all flushed to be qualified. (8) Flushing standard When there are no regulations in the design, the water color and transparency of the outlet are consistent with the visual inspection of the inlet water.
(9) Disinfection of drinking water pipes before use shall be carried out after each liter of water is filled with clean water containing 20 ~ 30mg of free chlorine. Chlorinated water is in the pipeline.
Should stand still for more than 24 hours, and then rinse with clean water after disinfection. The commonly used disinfectant is bleaching powder. During disinfection, the bleaching powder is put into a barrel, stirred and dissolved with water, filled with water and added into the pipeline section, soaked for 24 hours and washed with water. Table 9.3.3-7 can be used for newly installed drinking water pipes. (4) Quality standards
1 general provisions
The pipes for conveying domestic water supply should be plastic pipes, composite pipes, galvanized steel pipes or cast iron pipes for water supply. Plastic pipe, composite pipe or water supply
The pipes and fittings of cast iron pipes should be the matching products of the same manufacturer.
2 master control project
(1) When the water supply pipeline is buried, it should be below the local freezing line. If it must be laid above the freezing line, reliable insulation and moisture-proof measures should be taken. If there is no frozen area, when buried, the buried depth of the pipe top covering soil shall not be less than 500mm, and the buried depth of the road crossing part shall not be less than 700mm.
Inspection method: field observation and inspection.
(2) The water supply pipeline shall not directly pass through sewage wells, septic tanks, public toilets and other pollution sources.
Inspection method: observation and inspection.
(3) Interface flange, bayonet, clamp, etc. Pipes shall be installed in inspection wells or pipe trenches and shall not be buried in soil.
Inspection method: observation and inspection
(4) The distance between the shaft wall and the flange or socket when there is no requirement for the pipeline installation of various wells in the water supply system; Diameter less than or equal to
Is equal to 450mm, shall not be less than 250mm；; When the pipe diameter is greater than 450mm, it shall not be less than 350 mm.
Inspection method: straightedge inspection
(5) Water pressure test must be conducted for the pipe network, and the test pressure is 1.5 times the working pressure, but not less than 0.6Mpa.
Inspection method: When the pipeline is steel pipe or cast iron pipe, the pressure drop under the test pressure within 10min should not be greater than 0.05Mpa, and then it will drop.
Check to the working pressure, the pressure should remain unchanged, no leakage; When the pipeline is a plastic pipe, the pressure drop of 1h should be stabilized under the test pressure.
No more than 0.05Mpa, and then drop to the working pressure for inspection, the pressure should remain unchanged, no leakage.
(6) The buried anticorrosion of galvanized steel pipes and steel pipes must meet the design requirements. If it is not specified in the design, please refer to the table "Type of pipeline coating".
The provisions of the implementation. Coils and pipes should be pasted firmly, without hollowing, sliding and lax interface.
Inspection method: Observe and cut the anticorrosive coating for inspection.
(7) After the water supply pipeline is completed, the pipeline must be flushed, and the drinking water pipeline must be disinfected after flushing to meet the sanitary requirements of drinking water.
Health requirements.
Inspection method: Observe the turbidity of washing water and check the inspection report provided by relevant departments.
3. General projects
(1) The coordinates, elevation and slope of the pipeline shall meet the design requirements, and the allowable deviation of pipeline installation shall meet the table "Outdoor Water Supply Pipeline Installation".
Provisions on allowable deviation and inspection method.
(2) The paint of pipes and metal supports shall be well attached, and there shall be no defects such as peeling, blistering, flowing and missing coating.
Inspection method: field observation and inspection.
(3) The pipe connection shall conform to the process requirements, and the installation positions of valves and water meters shall be correct. Water meters, valves, etc. On the plastic water supply pipe.
The weight of the facility or the torque of the opening and closing device shall not act on the pipeline, and an independent supporting device must be set when the pipe diameter is 50 mm or more.
Inspection method: field observation and inspection.
(4) Water supply pipeline and sewage pipeline are laid in parallel at different elevations. When the vertical spacing is within 500mm and the diameter of water supply pipeline is less than or equal to 200mm, the horizontal spacing of pipe wall should not be less than1.5m; ; When the pipe diameter is greater than 200mm, it shall not be less than 3mm.
Inspection method: observation and ruler inspection.
Four, fire pump adapter and outdoor fire hydrant installation
(a), material quality requirements
1) The selection of outdoor fire hydrants, fire adapters, valves and other product models should meet the design requirements.
2) Strictly check whether the switches of fire hydrants and adapters are flexible, firm and consistent, and whether the auxiliary equipment and accessories are complete.
The product shall have the production license and the approval certificate of the fire department.
(2), process flow
(3), the operation process
1 For the valve installation of fire hydrant and fire pump adapter, see the valve installation process in this standard.
For the installation of outdoor fire hydrant and fire pump adapter, refer to standard drawings 0 1S20 1 and 99S203.
2 Fire hydrant pipeline installation: branch pipe installation and supervisor installation should be selected according to the actual geographical situation on site.
3 For "shallow buried installation" fire hydrant, the branch pipe leading out from the main pipe should be as short as possible.
4 the connection between the hydrant short pipe and the water supply pipeline can be in the form of flange and socket interface. In general, flanges are used when the pressure is 1.6Mpa.
Connection, 1.0Mpa pressure adopts socket connection, and the connection type should be indicated when ordering. (For the connection process, refer to the pipeline installation standard)
The fire hydrant is equipped with an automatic drainage device, which automatically drains the accumulated water in the fire hydrant when the built-in water outlet valve is closed to prevent the fire hydrant from freezing and cracking.
6 hydrant elbow base or hydrant tee consists of buttresses, which must hold the bottom of elbow or tee tightly.
7 when the drain is located outside the well, a pebble impervious layer should be made at the drain, with a pebble particle size of 20 ~ 30 mm and a laying radius of not less than.
500mm, and the laying depth is 200m above the drainage ditch to the bottom of the pond. Attention should be paid to protecting the drainage device when laying pebbles.
8 Buried pipeline anticorrosion shall be carried out according to the design requirements of drawings, and the flange interface shall be coated with asphalt cold priming oil and asphalt paint twice each, and asphalt linen or
0.2mm thick plastic film wrapped tightly.
9 Installation of fire pump adapter valve group
10 If the calculated outdoor heating temperature is lower than-15℃, the wellhead shall be insulated or other insulation measures shall be taken.
See 97S40 1 for details.
1 1 Hydraulic test and flushing of fire hydrant and water pump fire adapter, and hydraulic test and flushing of pipe network.
(4), quality standards
1 general provisions
1) The installation positions and forms of fire pump adapters and outdoor fire hydrants must meet the design requirements.
2 master control project
1) system must be subjected to water pressure test, and the test pressure is 1.5 times the working pressure, but not less than 0.6Mpa.
Inspection method: Under the test pressure, the pressure drop is not more than 0.05Mpa within 10min, and then it is reduced to the working pressure for inspection, and the pressure is maintained.
No change, no leakage.
2) Before the completion of the fire fighting pipeline, the pipeline must be flushed.
Inspection method: Observe the turbidity of washing water.
3) The position signs of fire pump coupler and fire hydrant should be obvious, and the position of bolt mouth should be easy to operate. Fire pump adapter and outdoor fire extinguisher
When the fire hydrant is wall-mounted, if there is no requirement in the design, the installation height from the center of the inlet and outlet of the fire hydrant to the ground should be 1. 10m, and should be set above it.
There are measures to prevent falling objects from hitting.
Check fire hydrants and other equipment to build piers and install fire hydrants.
Hydrostatic test of treating the gap between pipeline and borehole wall
Installing branch pipe
Anticorrosion of connecting pipes
Inspection method: observation and ruler inspection.
3 general projects
1) The installation dimensions of outdoor fire hydrant and fire pump adapter should meet the design requirements, and the allowable deviation of the installation height of the bolt mouth should not be plus or minus 20 mm. ..
Inspection method: straightedge inspection.
2) The distance between the top water inlet of the underground fire pump adapter or the top water inlet of the underground fire hydrant and the bottom surface of the fire manhole cover should not be greater than.
400mm, the well should have enough operating space, and set up a ladder. Freezing measures should be taken for wells in cold areas.
Inspection method: observation and ruler inspection.
3) The installation position and direction of the safety valve and check valve of the fire pump adapter should be correct, and the valve should be flexible to open and close.
Inspection method: field observation and manual inspection.
Five, outdoor drainage pipe installation
(a), material quality requirements
1. Acceptance of plastic pipes
The appearance quality of pipes and fittings shall meet the following requirements:
1) The color shall be uniform, without uneven color and decomposition discoloration lines;
2) The inner wall is smooth and smooth, without bubbles, cracks, peeling, serious cold spots, obvious cracks and depressions;
3) The pipe should not be bent in the opposite direction in the axial direction, the straightness deviation should be less than 65438 0%, and the port should be straight and perpendicular to the axis;
4) Pipe fittings shall be intact without deformation, and closed joints and gates shall be smooth without cracks;
5) The socket surfaces of pipes and fittings shall be smooth and accurate in size to ensure the sealing performance of the interface.
6) The adhesive should be in its own flowing state, should not be gel-like, and should not have caking, insoluble particles and any influence on adhesion without stirring.
impurity
7) The adhesive shall not contain substances that are toxic and beneficial to the growth of microorganisms, and shall not affect the water quality and the taste and smell of drinking water.
8) The lap joint on each rubber ring shall not exceed two places, and the cross section of the rubber ring shall be uniform.
(2), process flow
(3), the operation process
1. Pipeline laying
1) Preparation before pipeline laying:
① Check the quality of pipes, couplings and interface materials. The pipe is damaged, the socket is short of meat and edges, and it is not allowed to be used.
(2) Check the foundation elevation and centerline. When the strength of foundation concrete reaches 50% of the design strength grade and is not less than 5Mpa, it is allowed to run the pipe.
(3) When the pipe diameter is greater than 700mm or the train pipe lowering method is adopted, the "horse path" with a width greater than 300mm and a slope of 1: 15 must be dug first.
(4) When transporting pipes by other methods, check the tools such as ropes, wooden frames, chains, pulleys, etc., and use them without damage. Temporary facilities should be fastened, and the back seat of the pipeline should be firm.
(5) Calibration measurement and recheck the slope board to see if it has been moved.
Pipeline inspection before pipeline laying: check the elevation of trench bottom and the strength of pipeline foundation: check the pipeline laying machinery and ropes.
Water-closing experiment of lower pipe interface
⑥ The condensate pipe laid on the foundation shall be measured according to the pipeline specifications, and the pillow foundation pit shall be dug before the pipeline laying, and the pillow foundation shall be lower than the pipeline bottom skin 10mm.
2) Run the pipeline
(1) According to the pipe diameter and on-site construction conditions, rope pressing method, tripod, wooden frame rope leakage method, rope double rope hook method, chain-inverted pulley method and train falling pipe method are adopted respectively, as shown in the following figure.
(2) Before running the pipe, it should start from one end of two inspection wells. If it is a socket, the socket should be in front.
(3) Before stabilizing the pipe, the inside and outside of the pipe mouth should be thoroughly scrubbed clean, and a clearance of 10㎜ should be left for the flat mouth or socket pipe interface with a pipe diameter above 600 mm, and a clearance of not less than 3mm should be left for the pipe diameter below 600 mm. ..
(4) After the pipeline is laid, it should be straightened, and a board should be placed under the crowbar, and it should not be directly inserted on the concrete foundation. After all the pipes between the two inspection wells are lowered and the slope is checked, the interface can be connected.
⑤ When using the coupling interface, stabilize the pipeline and install the coupling. When laying small-diameter socket pipe, after the first section of pipe is stable, put mortar under the socket and then insert the second section of pipe. The mortar squeezed into the tube should be leveled from the inner mouth.
2. Pipe interface
1) plastic pipe solvent bonding connection
1) Check the quality of pipes and fittings. The outer side of the pipe end and the inner side of the socket must be wiped clean to keep the bonding surface clean and free of dust, sand and water. When there is oil on the surface, it must be wiped with cotton yarn dipped in acetone and other cleaning agents.
2) When the socket pipe is used, the tightness between the socket and the socket shall be inspected. Before bonding, the two pipes must be inserted once, so that the insertion depth and looseness meet the requirements, and the marking line of the insertion depth of the socket is drawn on the end face of the socket. The depth at which the pipe end is inserted into the socket may be based on the measured socket depth.
3) When gluing, the inside of the socket should be coated first, and then the outside of the socket should be coated. When smearing the sleeve, it should be evenly applied from the inside to the outside along the axial direction, and it is not allowed to miss or smear too much.
4) Immediately after coating the glue, aim the direction at the axis, insert the pipe end into the socket, and push hard to the marking line. Insert the test tube after insertion.
Rotate 1/4 turn, keep the applied external force unchanged for at least 60s, and ensure the straightness and position of the interface are correct.
5) After splicing, the adhesive outside the extrusion joint shall be wiped clean in time.
Note: When processing various pipe fittings in the factory, the bonding and curing time is determined by the technical conditions of the manufacturer.
6) Glue joint shall not be constructed in rain or water, and shall not be operated below 5℃. The adhesive used must be checked and must not be used.
The ambient temperature of the adhesive with floc and the pipeline to be bonded should be basically the same, and it is not allowed to heat the adhesive with open flame or electric furnace.
3. The five-in-one construction method
1) The five-in-one construction method refers to the continuous construction of five processes: foundation concrete, pipe stabilization, splayed concrete, seam-wrapped concrete and plastering.
2) When the five-in-one construction method is adopted for the design of pipelines with a diameter less than 600mm, the procedure is as follows:
(1) According to the measured foundation height and slope, the formwork shall be erected first, and the elevation of the pipe bottom shall be 2 ~ 3 mm higher, as the compression height of the foundation concrete. Then water it.
(2) Clean the nozzle and keep it moist. When lowering the pipe, slowly lower it, gently lower it to the foundation, immediately align it, and roll it to the specified elevation.
(3) After the pipeline is stabilized, the splayed concrete and joint concrete shall be laid and leveled with adhesive tape. However, the foundation, splayed concrete and plastering belt must be integrated.
(4) Before splaying, wash the surface of foundation concrete and pipe skin it contacts with with water; Eight-shaped and joint concrete can be poured separately, but it must be integrated; The specifications and quality of the sealing formwork should meet the requirements, and the erection should be firm. Before pouring concrete, the formwork should be watered and wetted.
⑤ After concrete pouring, do a good job of maintenance to prevent the pipeline from cracking and falling off due to earthquake.
4. The four-in-one construction method
1) The five-in-one construction method shall not be adopted for pipelines with a diameter greater than 600mm, and the four-in-one construction method can be adopted.
(1) After the foundation concrete reaches 50% of the design strength and is not less than 5Mpa, four processes of pipe stabilization, splayed concrete, seam wrapping and plastering shall be carried out continuously.
(2) Indivisible intermittent operation.
2) Other construction methods are the same as the Five in One.
5. Closed water test of outdoor drainage pipeline
The pipeline should be checked for tightness after being filled with water for 24 hours, and the water level should be higher than the top of the pipeline at the upstream end of the inspection section. If the groundwater level is higher than the pipe top, it should be higher than the groundwater level. Generally, visual inspection is adopted. When checking, make up water, keep the water level unchanged and avoid water leakage.
Is considered qualified.
(4) Quality standards
1 general provisions
1) This chapter is applicable to the quality inspection and acceptance of outdoor drainage pipe network installation works in civil buildings (residential quarters) and factories.
2) Outdoor drainage pipes should adopt concrete pipes, reinforced concrete pipes, drainage cast iron pipes or plastic pipes. Its specifications and quality must conform to the current situation.
National standards and design requirements.
2 master control project
1) The slope of drainage pipeline must meet the design requirements, and no slope or reverse slope is strictly prohibited.
Inspection method: check with level, stay wire and ruler.
2) Before the pipeline is buried, irrigation test and drainage test must be done, and the drainage should be unobstructed, and there is no blockage and leakage at the pipeline joint.
Inspection method: according to the drainage inspection well, increase the test head 1m at the top of the upstream pipe of the test section for at least 30min.
Cross section observation.
3 general projects
1) The coordinates and elevation of the pipeline shall meet the design requirements.
Six, pipe trench construction
(1) trench excavation construction
1 process
2 operation flow
Measurement and positioning
1) Find a fixed leveling point before measurement, and its accuracy should not be lower than the third class.
2) During the measurement, set temporary leveling points along the pipeline.
3) Measure the angle between the center line of the pipeline and the corner. And connected to the local fixed buildings.
4) When the pipeline crosses the original underground pipeline or structure, special signs shall be set for public display.
5) Records shall be made in the measurement process, and all leveling points and connecting lines shall be recorded.
6) The coordinate and elevation deviation of water supply pipeline shall comply with the provisions of this standard, and the deviation value shall be controlled to meet the deviation requirements of measurement and positioning.
Trench excavation
1) According to the local frozen layer depth; The trench excavation size is determined by calculation, and the upper opening trench line is set out.
D < 300mm: D+ pipe skin+freezing depth+0.2m.
D > 300mm mm: D+ pipeline skin+freezing depth.
D > 600: D+ pipe skin+freezing depth-0.3m.
Table 9.5.2- 1
Diameter (mm) 50 ~ 75100 ~ 300350 ~ 600700 ~1000.
Measure and determine the line shape, groove positioning, groove excavation and groove backfilling of the center pile of the wire nail.
2) According to the requirements of design drawings and the center line of measurement and positioning, the size is calculated according to the trench excavation, and the grey line is laid.
3) Divide sections according to the number of people and the best working face, and excavate from shallow to deep.
4) Class I and Class II soil can be excavated by 30cm layer by layer, and the excavation is carried out by inverted steps. For the third and fourth types of soil, loosen the soil with picks first, and then about 30cm.
Dig forward in layers.
5) Every time a layer of bottom cleaning is dug, the slope shall be cut and shaped at the depth of 1m, and leveled at the same time, and small horizontal control piles shall be laid on the slope.
6) When digging the trench and checking the trench bottom, leave 15 ~ 20 cm at the trench bottom for temporary excavation. Before the next process, the excavation surface should be leveled, for example, by itself.
Fang accidentally destroyed the natural soil layer, so the loose soil should be removed first, filled to the elevation with sand and compacted.
7) The rock pipeline foundation shall be filled with sand layer with thickness not less than100 mm. ..
8) When there is groundwater, drainage or artificial pumping shall ensure that the water is removed before the next working procedure.
9) Before pipeline laying, a ruler shall be laid in accordance with regulations, and the design elevation of the trench bottom shall be cleaned. Dig the working pit as specified in the table below.
10) When mechanical trenching is adopted, there should be a special person to direct it. In order to ensure that the soil layer at the bottom of the ditch will not be disturbed and damaged during mechanical trenching, when the pipe can't be laid on the same day, a layer of about 0.2m should be left at the bottom of the ditch, which should be cleaned manually before the pipe is laid.
C, backfilling
1) The pipeline shall be backfilled immediately after installation and acceptance.
2) When backfilling, there shall be no water in the ditch, water for backfilling, silt, organic matter and frozen soil. Backfill soil shall not contain stones, bricks and other hard objects.
3) Trench backfilling shall be carried out symmetrically from both sides of pipelines, inspection wells and other structures at the same time, so as to ensure that the pipelines will not be displaced, and limit measures can be taken when necessary.
4) The backfilling of both sides of the pipeline and the part 0.5m above the top of the pipeline shall be compacted in layers from both sides of the pipeline at the same time, and the pipeline and anticorrosion layer shall not be damaged. The backfill of the rest of the trench should also be compacted in layers. The backfill of the working pit of the pipe joint must be carefully compacted.
5) Backfill design and sand filling shall meet the design requirements.
6) Mechanical backfill can be used at the position above 0.7m at the top of the pipeline, and the machinery cannot directly run on the upper part of the pipeline.
7) Pipeline backfilling should be carried out when the pipeline is full of water, and it is not advisable to stay in an empty pipe state for a long time after pipeline laying.
(3) Quality standards
1 general provisions
1 well chamber construction should have anti-freezing measures in winter and sun protection measures in summer.
2 master control project
1) The trench foundation treatment and well chamber foundation must meet the design requirements.
Inspection method: field observation and inspection.
2) The manhole covers of all kinds of wells shall meet the design requirements, and shall be clearly marked with words, and all kinds of manhole covers shall not be mixed.
Inspection method: field observation and inspection.
3) All kinds of wells under open-air roads or residential roads must use heavy wells and manhole covers, and the upper surface of manhole covers should be flush with the road surface, with an allowable deviation of 5 mm. Light wells and manhole covers can be used for green belts and closed traffic places, and the upper surface of manhole covers should be 50mm higher than the ground.
The slope around the wellhead is 2%, and the slope is protected by cement mortar.
Inspection method: observation and ruler inspection.
4) Heavy cast iron or concrete well rings shall not be placed directly on the brick wall of the well chamber, and the brick wall shall be made of fine stone concrete with a thickness of not less than 80mm.
Inspection method: observation and ruler inspection.
3 general projects
1) The coordinates, position and elevation of the trench bottom meet the design requirements.
Inspection method: observation and ruler inspection.
2) The bottom of the ditch shall be the original soil layer or compacted backfill soil, and the bottom of the ditch shall be smooth and free from sharp objects.
Shitou, etc
Inspection method: observation and inspection.
3) If the ditch is rock, hard-to-remove block stone or rock stratum, the bottom of the ditch should be dug 100 ~ 200 mm, and the spun yarn or particle size should not be greater than 5 mm.
Fine soil shall be compacted to trench bottom elevation before pipeline laying.
Inspection method: observation and ruler inspection.
4) Trench backfilling shall be carried out with sand or stony soil and frozen soil within 200mm of the pipe top, and mechanical backfilling shall not be adopted; Guandingshang
Stones and frozen soil blocks with a diameter greater than 100mm shall not be backfilled within 500mm; Part above 500mm is backfilled in rocks and frozen soil?
We need to concentrate. When backfilling the upper part with machinery, the machinery shall not run on the pipe trench.
Inspection method: observation and ruler inspection.
5) Well chamber masonry shall be constructed according to the design or the given standard drawing. When the elevation of the well bottom is higher than the groundwater level, the basement should be compacted with plain soil;
Below the groundwater level, the foundation shall be made of 100 mm thick concrete floor. Cement mortar should be used for masonry, and the inner surface should be plastered tightly.
Permeable.
Inspection method: observation and ruler inspection.
6) When the pipeline passes through the borehole wall, it shall be filled with cement mortar and leveled twice, and there shall be no leakage.
Inspection method: observation and inspection
9.6 finished product protection
9.6. 1 Positioning control piles and dug pipe trenches shall be protected.
9.6.2 After laying the water supply pipeline and before backfilling the trench, protective measures should be taken to prevent the pipeline from being damaged.
9.6.3 The water pressure test of winter construction should be protected, and drainage should be carried out after the pressure test to avoid freezing crack of the pipeline.
9.6.4 Fire hydrants, fire pump adapters, etc. Before the installation is completed, it should be protected at the construction site.
VII. Safety and Environmental Protection
(1) safety measures
1 The rope of the hanging pipe must be fastened, and the lifting shall be under unified command and coordinated action. After lifting the pipeline, the operator in the ditch should
Avoid it in case of injury.
2 Construction personnel should wear safety helmets.
3 when cutting the pipe by hand, you should not be too hasty or too fierce. When the pipe is about to break, you should hold the pipe to prevent it from hitting your feet when it rolls out of the chute.
4 in the process of pipe fitting, we should take care of each other to prevent squeezing hands.
5 There must be sufficient lighting when digging the trench at night, and warning signs should be set outside the main traffic lanes.
6 when the groove is too deep, ladders should be used for the upper and lower grooves, and the slope conditions should be checked frequently when the groove is excavated to prevent people from being injured by the variation landslide.
7 when picking and sledgehammer, pay attention to check the picking and sledgehammer to prevent falling off and hurting people.
8 When passing objects up and down the pipe trench, they are not allowed to be abandoned, but should be passed up and down on the rope. Other answers are sorted by time and votes.