➤ requirement description 1
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2
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The outdoor site is backfilled in place and the compactness meets the specifications
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The end cut of the casing shall be flat and smooth
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After the control pile is completed, sprinkle white lime out of the pipeline network and the position of its supporting structures (such as concrete well chamber) to determine the earthwork excavation line and excavation position
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The cross brace of the same layer of each support should be on the same horizontal plane, and its height deviation should be ≤ 5mm, which is consistent with the slope of the cable trench
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Check the location distribution map of underground temporary pipelines (temporary water and electricity) and cross conflict marks
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Stack neatly and take measures to prevent rain, sun and rolling
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The cable support should be welded with the embedded parts of the trench wall
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The construction of the next process shall not be carried out without passing the acceptance inspection and signing
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Set up a total station to propose the construction control points of the pipe network, and propose the construction control points according to the length of the whole pipe network and the number of corners, which are the starting point, ending point, corner point of the pipe network and the middle point of the long pipe section
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The side wall of the cable trench shall be built with 240mm thick solid brick wall
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➤ It is required that before the foundation construction of buried pipeline, the depth, width and slope of trench excavation must be inspected to meet the design slope requirements of water supply and drainage pipeline
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After the trench inspection is qualified, concrete shall be poured as soon as possible
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Acceptance of center line coordinates: use theodolite to check whether the coordinates of each mileage pile placed by the contractor are consistent with the drawings
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This paper summarizes the process quality acceptance standards and requirements for the outdoor comprehensive pipe network project of CNOOC real estate project, which is worthy of reference and implementation by engineering friends
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The ditch wall masonry mortar shall be full and dense without cracking and water seepage
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Check with the supervisor whether the bottom elevation of the excavated pipe trench is consistent with the design drawing
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After the trench is excavated, the sump shall be excavated separately by sections, and the standby sewage pump shall be used to drain the water collected in the trench
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The site leveling elevation shall comply with the landscape design elevation
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3
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3
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Materials supplied by Party A and Party B: the materials shall be submitted by the Contractor before entering the site, together with the “declaration form of materials supplied by Party A and Party B” and “declaration form of materials supplied by Party B”, which can be selected for use only after being reviewed and approved by the Project Department of the employer; When the first batch of materials enter the site, the Contractor shall provide the employer with relevant data and samples of the materials to be selected for filing
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2
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Appearance requirements: the inner and outer walls of the bellows shall be free of bubbles, cracks, split discoloration lines and obvious signs
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the supporting pipe network outside the building, mainly includes: drainage pipeline (sewage pipe, rainwater pipe), heat pipeline, gas pipeline, water supply pipeline (tap water pipe, medium water pipe, purified water pipe), communication and intelligent pipeline (telephone, cable TV, broadband network), power pipeline, etc
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It shall be supported by steel sheet piles, and 2 ~ 4m can be supported by horizontal plates and vertical plates
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The model and size of the support are consistent with the design, the surface of the full-length flat iron is flush, and the grounding meets the specifications
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The appearance inspection shall be free of peeling, missing brush, rust, bubbles and bottom penetration
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After the masonry is completed, 20mm 1:3 cement mortar shall be plastered on the inner side of the trench, and the surface shall be calendered
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3
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2
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➤ Requirements description 1
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The horizontal spacing of supports shall be consistent, and the inter layer distance shall not be less than twice the cable outer diameter plus 10mm
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If damaged, cracked, deformed and other defective materials are found, they shall be removed in time
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Process pipeline positioning and setting out ➤ Quality acceptance standard 1
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Before the construction of the comprehensive pipe network, it is necessary to stack the drawing with the landscape construction drawing, optimize the location of rainwater and sewage inspection wells, avoid Yin and Yang wells and inspection wells, and try not to set them in the gate and flower platform
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The anti-corrosion works of buried equipment and pipelines shall be inspected and accepted after the coating operation is completed, the coating layer has been dry, and before the concealed operation.
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➤ Requirement Description 1
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In addition to the good soil that meets the backfilling requirements, the stacking place of excess spoil and waste stones must be more than 0.8m away from the edge of the notch and less than 1.0m high, so as to prevent the waste blocks from rolling into the trench and causing safety accidents
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For coating thickness detection, the thickness measured by magnetic thickness gauge shall not be less than the involved thickness, otherwise, the number of coating passes shall be increased until it is qualified
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3
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Control piles and construction piles shall be set at each corner of the pipeline, and the position of mileage piles of each pipeline shall be checked to be consistent with the drawings
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For 35kV and above high-voltage cables, it shall be less than twice the cable outer diameter plus 50mm
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The ditch bottom elevation is consistent with the design
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2
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The distance between cable supports along the wall shall be less than 800mm, the distance from the uppermost layer of cable support to the top of shaft or floor shall not be less than 150 ~ 200mm, and the distance from the lowest layer of cable support to trench bottom or ground shall not be less than 50 ~ 100mm
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The inner wall of the pipe shall be smooth and flat without obvious ripple, and the outer wall of the casing shall have uniform ripple without depression
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The cutting position is controlled at the bonding position of the inner and outer walls
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2
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3
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2
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The bottom elevation and slope of rainwater and sewage drainage pipe shall be flat and meet the design requirements and specifications
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If the soil quality is unqualified after excavation to the design elevation, corresponding soil replacement measures shall be taken to prevent settlement
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➤outdoor equipment and pipeline anti-corrosion process Quality acceptance standard 1
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3
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The anti-corrosion coating of buried steel pipe meets the specification
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➤ Requirement Description 1
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➤ quality acceptance standard for each buried pipeline outside the process room 1
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2
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During construction, sampling and inspection or destructive testing of a closed part can be carried out at any time
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The finished capping is tightly bonded with the wall, and the joint width of the raw slurry is consistent
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3
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➤ Requirement Description 1
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The tangent plane is on the axis of the pipe (the perpendicularity deviation shall not exceed 3.5% of the minimum average inner diameter)
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2
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2
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3
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The length and wall thickness of each pipeline shall be measured according to the corresponding national standard parameters, and the sampling inspection shall be carried out according to the proportion of 10 / 100
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Outdoor comprehensive pipe network, i.e
2
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At the same time, the height of flat foundation surface shall be strictly controlled, and the foundation deviation shall meet the specification requirements
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The sliding water at the bottom of the ditch shall be provided with a longitudinal slope of 3 / 1000, a water collecting well shall be provided at the ditch well every 50m, and the pre DN100 PVC drainage pipe shall be connected with the nearby rainwater pipe network
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Other anti-corrosion coatings shall be tested according to corresponding specifications and standards
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The review of outdoor comprehensive pipeline stack is completed
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Construction procedure of ditch bottom foundation Quality acceptance standard 1
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➤ Requirement Description 1
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3
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Elevation acceptance: use theodolite triangle elevation to check whether the elevation measured by the contractor meets the specifications and drawings, and check whether the top elevation conflicts with the landscape elevation after the construction of rainwater and sewage pipes
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Process site leveling elevation measurement ➤ Quality acceptance standard 1
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The employer and the supervisor shall accept the materials on site
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The inner and outer walls of the corrugated concave part of the casing shall be closely welded without separation
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2
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The location of the inspection well does not conflict with the location of the hard scene
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The cross section of pipe trench foundation cushion shall be greater than 300mm
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4
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The qualification certificate data are complete
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4
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Process outdoor cable trench ➤ Quality acceptance standard 1
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When the trench bottom is backfill, the grade of foundation concrete or gravel cushion and thickness shall meet the design requirements and specifications
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The slope is 1:0.3, and the trench depth is greater than 4m
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The thickness of common petroleum asphalt anti-corrosion coating shall not be less than 3mm, and the allowable deviation is -0.3mm; The thickness of reinforced anti-corrosion coating is 6mm, and the allowable deviation is -0.5mm; The thickness of extra reinforced anti-corrosion is 9mm, and the allowable deviation is -0.5mm
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4
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Quality acceptance system requirements: after each procedure is completed, the construction unit, Timely report to the supervision engineer and the project professional engineer of the owner for on-site acceptance inspection and signature for approval, and keep the image data for filing, so that each process is under control
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The cable support shall be fixed firmly without significant deformation
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3
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2
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Materials supplied by Party A: the materials received shall be jointly accepted by the project Department of the employer, the contractor and the supervision engineer, and the “preliminary acceptance form of materials supplied by Party A” shall be signed
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The deviation between the vertical clear distance between each cross brace and the design shall not be greater than 5mm
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➤pipe trench excavation procedure Quality acceptance standard 1
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The site handover procedures have been completed
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Main procedures of outdoor pipe network construction: pipeline material preparation – site leveling survey, positioning and setting out – earth excavation – trench bottom foundation construction survey – pipeline anti-corrosion and installation – pipeline well construction – pipeline closed water and pressure – pipe trench backfilling – well cover installation
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The welding position should be anti-corrosion, firmly installed, horizontal and vertical
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The slope of the pipeline trench meets the safety specifications
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All process inspections required by the project to be attended by the designer shall be attended together with the designer
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