埋地给水钢管道水泥砂浆衬里技术标准.docx

1、埋地给水钢管道水泥砂浆衬里技术标准埋地给水钢管道水泥砂浆衬里技术标准Technical standard for cement mortar lining for buried steel pipelineStandard of China Construction Standardization AssociationTechnical standard for cement mortar lining for buried steel pipelineCECS10: 89Editor in chief: Beijing municipal design and Research Insti

2、tuteApproval unit: China Association for standardization of engineering constructionDate of approval: November 27, 1989PrefaceFor buried steel water pipeline cement mortar lining technology, in recent years in the domestic engineering has been widely used and has mature experience. The water supply

3、pipe wall using cement mortar lining, not only can prevent the internal corrosion of the pipe scale, prolong the service life, and can protect the water quality, maintain or improve the transportation capacity of pipeline, energy saving, has obvious economic benefits and social benefits. In order to

4、 meet the needs of design and construction and ensure the quality of the project, this standard is specially made. This standard refers to the achievements of scientific experiments at home and abroad, combines with engineering practice and seeks the opinions of experts and units concerned, and has

5、been examined and approved by the National Technical Committee for pipeline structure standards.The technical standard for cement mortar lining of buried water supply steel pipe is hereby approved and is numbered CECS10: 89, and recommended to the engineering construction and construction units. In

6、the process of using, advice and information please send to Beijing Yuetan Nan Street Committee structure national standard B pipeline technology No. 2 (post encoding: 100045). China Association for standardization of engineering constructionNovember 27, 1989CatalogChapter I General ProvisionsSecond

7、 chapter materialsThe third chapter construction regulationsSection 1 General ProvisionsSecond section lining material preparationConstruction and maintenance of third section liningThe fourth chapter, lining quality inspection standard and methodThe fifth chapter repairsAppendix to the standard wor

8、dingAdditional instructionsChapter I General ProvisionsArticle 1.0.1 to prolong the service life of the pipeline for buried water, protect water quality, maintain or improve the transportation capacity of pipeline, to ensure the quality of cement mortar lining, the specially formulated standards.Art

9、icle 1.0.2 This standard applies to nominal diameter 500mm and above new or have been built for buried steel water pipeline.The water conveying pipe should be consistent with the surface water environmental quality standard (GB3838-88) or sanitary standard for drinking water (GB5749-85) requirements

10、. Water temperature shall not exceed 60 degrees centigrade.Article 1.0.3 this standard applies to the construction process of mechanical spraying on site. When the pipe diameter is greater than 1000mm, if there is no mechanical spraying equipment and have manual painting experience, allowed to hand

11、painted.Article 1.0.4 the quality index of the lining surface as specified in this standard is according to the roughness coefficient of the lining, and the n value is not greater than 0.012 of the standards set.Second chapter materialsArticle 2.0.1 lining cement should be used in Portland cement an

12、d ordinary portland cement and Portland slag cement, and shall comply with the national standard Portland cement and ordinary portland cement ( GB175-85 ), slag Portland cement, volcano marly Portland cement and Portland fly-ash cement (GB1344-85) regulations. Cement is marked 426 or 525.Article 2.0

13、.2 sand particles must be hard, clean and well graded. The quality standard and inspection method should be in accordance with the ordinary concrete sand quality standard and inspection method (JGJ52-79), sand clay, mica, organic impurities and other harmful substances should not exceed 2% of the to

14、tal weight of the total weight.Sand should be all through 1.19mm sieve (14 mesh), the 0.297mm (50 mesh sieve) should not exceed 55%, through 0.149mm sieve (100 mesh) should not exceed 5%.Apply screen selection before use.Article 2.0.3 water quality must be clean and shall not contain substances such

15、 as clay, oil, acid, alkali and organic substances that affect the quality of mortar lining. Drinking water should be adopted.Article 2.0.4 in order to improve the workability of mortar and the compactness and bond strength to additive, must be determined through tests, the harmful effect on the wat

16、er pipe and the corrosion of steel lining mortar admixtures shall.The third chapter construction regulationsSection 1 General ProvisionsArticle 3.1.1 cement mortar lining construction must be completed in the pipeline laying, test pressure qualified, and according to the design requirements of soil

17、compaction, lining construction process, the pipeline must be in a stable state.Article 3.1.2 the lining shall be checked before the construction of the deformation status, the maximum vertical displacement should not be greater than the design requirements, and shall not be greater than 2% of the p

18、ipe diameter.Article 3.1.3 lining construction, the inner wall of the pipe must be cleaned, the newly laid pipeline should remove loose oxide scale, rust, dirt, grease, welding slag, dirt and other attachments, weld steel pipe wall bulge height is greater than the thickness of the provisions of tabl

19、e 3.3.1 1 / 3, the old pipeline should be removed rust, scale and other attachments. After removal of the attachment, apply water cleaning. The lining of the pipe shall be free of condensation and water when lining.Second section lining material preparationArticle 3.2.1 cement mortar must be mechani

20、cally mixed and stirred. The consistency of the mortar shall be in accordance with the uniform density of the lining. Mortar should be used before initial setting.Article 3.2.2 the weight ratio of cement mortar in 1: 1 to 1: 2 in the range of selection of cement mortar slump should be 60 80mm, when

21、the diameter is less than 1000mm, allowing increased, but not more than 120mm.The first 3.2.3 cement mortar compressive strength shall not be less than 30MPa.Construction and maintenance of third section liningArticle 3.3.1 lining thickness and permissible tolerances of various diameters can be used

22、 as shown in table 3.3.1.When hand painted, the lining thickness specified in table 3.3.1 shall be painted separately.Nominal diameter(mm) lining thickness (mm), thickness tolerance (mm);Mechanical spraying, hand painting, mechanical spraying, hand painting500 700822800 100010221100 1500121432321600

23、 1800141632322000 2200151743432400 260016184343More than 2600 18204343Article 3.3.2 when using mechanical spraying process, the pipe near the elbow, three special fittings and the adjacent gate can be applied by hand, and to the smooth transition and mechanical spraying lining.When the pipe lining c

24、ement mortar reaches the final setting, it must be immediately watered and maintained, and the moisture content of the lining should be more than 7d. When using slag Portland cement, keep wet state should be above 10d.During maintenance, all the holes in the pipe section shall be tightly closed. Whe

25、n the curing period is reached, water should be filled in time, or the maintenance should be continued.The fourth chapter, lining quality inspection standard and methodArticle 4.0.1 cement mortar lining thickness can be measured by drilling method or thickness gauge. When the thickness gauge is used

26、, the tester shall be verified by the testing department, and the allowable tolerances shall be specified in table 3.3.1.When the diameter is greater than or equal to 800mm, each 100m long pipe inspection in 2 sections, each section should be measured by 2 points, if the 1 points are not qualified,

27、and then checks the 4 sections, such as there are still 2 points is not qualified, the detection section is not qualified. Pipes with a diameter of less than 800mm are desirable to be detected at both ends of the pipe section. The testing standards shall be the same as above, and the length of each

28、segment shall not exceed 500m.The first 4.0.Surface smoothness of 2 cement mortar linings. The gap between the lining surface and the ruler can be measured by using the 300mm ruler parallel pipe axis.The diameter of 800 2000mm, each 100m pipe sample 10, the gap 9 should be less than 1.6mm, if not me

29、t, then chouce 20, of which 18 of the gap should not be more than 1.6mm; the diameter is larger than 2000mm, the gap should not exceed 2.0mm, the detection method, otherwise not qualified.The pipe diameter is less than 800mm, close to the tube section at the ends of desirable detection, detection of

30、 each end of 4, the gap 3 should be less than 1.6mm, if not met, then the detection of 4, the gap 3 should be less than 1.6mm, otherwise unqualified. The length of each segment shall not exceed 500m.Article 4.0.3 surface roughness of cement mortar lining. When mechanical spraying construction, compa

31、re with the template; when hand painting construction, to feel smooth, no sand sense test. When it is considered that the actual n value needs to be detected, the flow test can be carried out after the pipeline has passed through the water.Article 4.0.4 cement mortar lining cracks caused by shrinkag

32、e, when its width is less than or equal to 1.6mm, and along the pipeline axial length is not greater than the circumference of the conduit and the length of not more than 5m can not repair. When the crack width is greater than 1.6mm, the cracks can be automatically healed after strengthening maintenance, which can be considered qualified.Article 4.0.5 cement mortar lining surface defects (pits, sand hole, empty nest etc.) every single shall not be greater than 5cm2, the depth of the defect acc