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Design of water supply pipeline buttress


Clams and other construction requirements tired of the main pipeline Kan ta l design can be seen from Table 1 37: s the same material interface,[link widoczny dla zalogowanych], the value of dead increases with the diameter reduction,[link widoczny dla zalogowanych], when the test pressure is constant. The larger the diameter the greater the P value,[link widoczny dla zalogowanych], the greater the set should also buttress: the contrary. P = reduction established by the buttress should also be reduced, when P ≤ 0 时 can be no buttress, but also from the stress of cement interface Ps values were more than the same diameter asbestos-cement interface Ps value. To 400mm of gray cast iron pipe with asbestos-cement interface, for example,[link widoczny dla zalogowanych], the test pressure P. Requirements for 1MPa, a look-up table 1 have Ps 1.350MPa. Let K a 0.8 P-0.000785 × 400 × (1-08 × 1.35) one by one 1005 <0, it is not to set buttress. Therefore, \However, the flexible water supply pipe connected in terms of El, such as the use of ductile iron apron El water supply pipeline access, the current specification of their interfaces were not allowed to bear to make the provisions of the internal water pressure Ps, found in the actual project 150mm Aprons the interface of ductile iron water pipe in the pipe network normal operation, when the pipeline pressure is 0.2MPa (2kg/em) when the short tube can be inserted disc ejection. Ps apron interface that is very small, basically can not withstand the water pressure, mainly from the rubber ring seal, so the apron for ≤ 350mm diameter ductile iron water pipe flexible interface should also be set in key parts of its buttresses . To reinforce the pipeline. 2 Improvement of the above, from a security point of view, in practical engineering experience in pipeline construction according to the diameter of ≤ 3501] 1 [I1 ductile iron water pipes need to set the buttress for the following states: \≥ 0.8MPa and the apron ≥ 100mm diameter water supply pipeline interface, T-branch in the top of the pipeline, following a socket of the elbow, plugs should be set at the top of buttress. \to ensure that the pipeline pressure test and no longer appear to run loose during the disconnection. 3 Conclusion With the progress of science and technology and building materials industry, a variety of new water supply pipeline are working to promote and popularize, including ductile iron pipe for its light weight, easy installation, corrosion resistance, easy maintenance and so popular the design, construction unit welcome. But it is flexible interface, with a weak interface, the shortcomings of water pressure to bear. In regulating the inner pressure to bear not to make their specific requirement, the designer in the design of buttress should be careful with \ensure that the pipeline pressure test is not running loose and out of touch. References 1] South China Municipal Engineering Design Institute of Water Supply and Drainage Design Manual zl Beijing: China Building Industry Press, 1986. OnSettingSupportPiersforWaterSupplyPipeBAIJian-guo, CHENIi-fang. , WANGZhao (1DepartmentWaterConservancy, HebeiEngineeringandTechnicalCo [Iege, Cangzhou061901, China:: HebelBaodlngWaterSupplyCorporation, Baoding071O5.China; 3HebelBaodIngWaterConseJ ... vBureau.Baoding071951, ChinaAbstract: Basedontheworkingexperiences, thispaperraisedthelimitationsofthesettingelementsstipulatedinWaterSuppandDrainageDesigningHandbookfoTsupportpierswhichisonlysuitableforthehard】 ointpipes, andSOrlleadvieesOFtsettingsupportpiersinsoftjointonesareputforward.Keywords: hardjoint; softjoint: supportpiers (Editor: Di Guojing)

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