1、Designation: C923 08 (Reapproved 2013)1Standard Specification forResilient Connectors Between Reinforced Concrete ManholeStructures, Pipes, and Laterals1This standard is issued under the fixed designation C923; the number immediately following the designation indicates the year oforiginal adoption o
2、r, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1NOT
3、EEditorially corrected 5.3 in January 2016.1. Scope1.1 This specification covers the minimum performance andmaterial requirements for resilient connectors used for connec-tions between reinforced concrete manholes conforming toSpecification C478 and pipes, between wastewater structuresand pipes, and
4、 between precast reinforced concrete pipe andlaterals.1.1.1 These connectors are designed to minimize leakagebetween the pipe and manhole, and between the pipe andlateral.1.2 Acomplete metric companion to Specification C923 hasbeen developedC923M; therefore, no metric equivalents arepresented in thi
5、s specification.NOTE 1This specification covers the design, material, and perfor-mance of the resilient connection only. Connections covered by thisspecification are adequate for hydrostatic pressures up to 13 psi (30 ft)without leakage when tested in accordance with Section 7. Infiltration orexfilt
6、ration quantities for an installed system are dependent upon manyfactors other than the connections between manhole structures and pipe,and allowable quantities must be covered by other specifications andsuitable testing of the installed pipeline and system.1.3 The following precautionary caveat per
7、tains only to thetest methods portion, Section 7, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the app
8、licability of regulatory limita-tions prior to use. For a specific precaution statement, see7.2.5.2. Referenced Documents2.1 ASTM Standards:2A493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA666 Specification for Annealed or Cold-Worked AusteniticStainless St
9、eel Sheet, Strip, Plate, and Flat BarC478 Specification for Circular Precast Reinforced ConcreteManhole SectionsC822 Terminology Relating to Concrete Pipe and RelatedProductsC913 Specification for Precast Concrete Water and Waste-water StructuresD395 Test Methods for Rubber PropertyCompression SetD4
10、12 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD543 Practices for Evaluating the Resistance of Plastics toChemical ReagentsD573 Test Method for RubberDeterioration in an AirOvenD624 Test Method for Tear Strength of Conve
11、ntional Vul-canized Rubber and Thermoplastic ElastomersD883 Terminology Relating to PlasticsD1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD1566 Terminology Relating to RubberD2137 Test Methods for Rubber PropertyBrittleness Pointof Flexible Polymers and Coated
12、FabricsD2240 Test Method for Rubber PropertyDurometer Hard-nessNOTE 2For more information about wastewater structures, see Speci-fication C913.1This specification is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholesand Sp
13、ecials.Current edition approved July 1, 2013. Published July 2013. Originally approvedin 1979. Last previous edition approved in 2008 as C923 08. DOI: 10.1520/C0923-08R13E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For
14、Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 Definitions:3.1.1 Terms relating to plastics and rubber
15、 shall be asdefined in Terminologies D883 and D1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, andrelated products shall be as defined in Terminology C822 andas modified in 3.1.3 3.1.6.3.1.3 connectorthe entire assembly including resilientseals and metallic or nonmetallic
16、 mechanical devices, if any,used therein.3.1.4 lateralthe small diameter pipe connected to themain line pipe.3.1.5 pipethe inlet or outlet pipe connected to the man-hole.3.1.6 pipe stuba short section of pipe, installed in thestructure as an inlet or outlet pipe, for future connection.4. Materials a
17、nd Manufacture4.1 All materials shall conform to the following require-ments:4.1.1 Resilient materials for connectors and filler rings shallbe manufactured from natural or synthetic rubber and shallconform to the requirements prescribed in Table 1. If a spliceis used in the manufacture of the seal,
18、its strength shall be suchthat the seal shall withstand a 180 bend with no visibleseparation.4.2 Mechanical DevicesExpansion rings, tension bands,and take-up devices used for mechanically compressing theresilient portion of the connector against the pipe, manhole orwastewater structure shall be made
19、 from a material or materialsin combination that will ensure durability, strength, resistanceto corrosion, and have properties that will ensure continuedresistance to leakage. All metallic mechanical devices, includ-ing castings and bolt assemblies used to mechanically deformresilient materials shal
20、l be constructed of corrosion resistantmaterials meeting the physical properties and chemical com-position requirements of Specifications A493 and A666, Type302 through Type 316.NOTE 3Experience has shown that successful performance of thisproduct depends on the type of bedding and backfill and the
21、care in thefield installation of the manhole or wastewater structure and connectingpipes. The owner is cautioned to require inspection at the construction site.5. Principles of Design5.1 The design of the connector shall be such that positiveseal is accomplished at two locations: (1) between the con
22、nec-tor and the wall of the manhole or wastewater structure and (2)between the connector and the pipe. The seal between theconnector and the wall of the manhole or wastewater structureshall be made by either mechanical means, compression of theresilient material between the outside surface of the pi
23、pe andthe pipe opening in the wall of the manhole or wastewaterstructure, or by casting the connector integrally with the wall ofthe manhole or wastewater structure. The seal between theconnector and the pipe shall be made by mechanical means orby compression of the resilient material against the ou
24、tside ofthe pipe. Resilient filler rings are not prohibited from beingused between the pipe and the connector to provide a seal.Whichever design is used, it shall be capable of maintaining aresilient, hydrostatic seal under the performance conditions inaccordance with Section 7. Devices used to effe
25、ct mechanicalseals shall conform to the requirements specified in Section 4.5.2 For lateral to pipe connectors, the design of the connec-tor shall be such that a positive seal is accomplished at twolocations: (1) between the connector and the pipe wall and (2)between the connector and the lateral. T
26、he seal between theconnector and the pipe wall shall be made by either mechanicalmeans, compression, or by casting the connector integrallywith the pipe wall. The seal between the connector and thelateral shall be made by either mechanical means or bycompression of the resilient material against the
27、 outside of thepipe. Resilient filler rings are not prohibited from being usedbetween the lateral and the connector to provide a seal.Connector design must not allow either lateral or connector toextend past the cylindrical plane of the pipe inside diameter.The connector shall be capable of maintain
28、ing a resilientTABLE 1 Resilient Material TestsTest Test RequirementsAASTM Test MethodChemical resistance: D543, at 22C for 48 h1 N sulfuric acid no weight loss1 N hydrochloric acid no weight lossTensile strength 1200 psi, min D412Elongation at break 350 %, minHardnessB5 from the connector manufactu
29、rers specified hard-nessD2240 (Shore A durometer)Accelerated oven-aging decrease of 15 %, max, of original tensile strength,decrease of 20 %, max, of elongationD573, 70 1C for 7 daysCompression set decrease of 25 %, max, of original deflection D395, Method B, at 70C for 22 hWater absorption increase
30、 of 10 %, max, of original by weight D471, immerse 0.75 by 2 in. specimen indistilled water at 70C for 48 hOzone resistance rating 0 D1149Low-temperature brittle point no fracture at 40C D2137Tear resistance 200 lbf/in. D624, Die BASpecimens shall be prepared from connector specimens, and shall not
31、be prepared from laboratory slabs or by direct molding.BThe connector manufacturer shall select the hardness appropriate for each component of the connector. Thereafter, the hardness shall comply within the tolerances inTable 1.C923 08 (2013)12hydrostatic seal under the performance conditions in acc
32、or-dance with Section 7. Devices used to effect mechanical sealsshall conform to the requirements specified in Section 4.5.3 Purchaser shall require that all pipe stubs installed, toallow for future connection to the manhole or wastewaterstructure, be mechanically restrained from movement bymeans ot
33、her than, and in addition to, the resilient connectors.6. Basis of Acceptance6.1 For diameter 36 in. and smaller, at least one connectorshall be tested for each 6 in. increment in diameter. Fordiameters larger than 36 in., at least one connector shall betested for each 12 in. increment in diameter.6
34、.2 The acceptability of the resilient connector shall bedetermined by the results of the physical tests prescribed in thisspecification, if and where required, and by inspection, todetermine whether the connector conforms to the specificationwith regards to design and freedom from defects.6.3 When r
35、equested, a current certification shall be fur-nished as the basis of acceptance. The certification shall consistof the connector manufacturers test report, or statement by themanufacturer, accompanied by a copy of the test results, thatthe resilient connector has been tested and inspected inaccorda
36、nce with the provisions of Section 4 and Section 7.Each certification so furnished shall be signed by the connectormanufacturer or an authorized agent.NOTE 4Certification shall be deemed current, if it represents presentdesign, and bears a date that is no more than five years older than thecurrent d
37、ate.7. Test Methods and Requirements7.1 Install a pipe(s) and the resilient connector(s) to betested in the base section of a manhole or wastewater structure.Subject the assembly to the prescribed hydrostatic pressure in7.2 at the centerline of the connector for a period of 10 min foreach test condi
38、tion. Restrain the pipe against axial movementduring the tests.NOTE 5The user of this specification is advised that if manhole basesgreater than 48 in. inside diameter are required to accommodate largediameter connectors for the test, all safety requirements and proceduresshould be reviewed prior to
39、 the test.7.1.1 Install a lateral and resilient connector to be tested intothe pipe. Subject the assembly to the prescribed hydrostaticpressure in 7.2 at the centerline of the connector for a period of10 min for each test condition. Restrain the lateral against axialmovement during the tests.7.2 The
40、re shall be no leakage under any of the followingconditions:7.2.1 Straight alignment of the pipe(s)/lateral(s) subjected toa hydrostatic pressure of 13 psi (30 ft) for 10 min.7.2.2 Axial deflection of the pipe(s)/lateral(s). Uponcompletion of the test for straight alignment in 7.2.1 thepipe(s)/later
41、al(s) shall be axially deflected at least 7 in anydirection and subjected to a hydrostatic pressure of 10 psi (23ft.) for 10 min.7.2.3 When the pipe is loaded in shear in accordance withthe requirements shown in Fig. 1 and subjected to a hydrostaticpressure of 10 psi (23 ft.) for 10 min.7.2.4 When t
42、he lateral is loaded in shear in accordance withthe loading requirements of Fig. 1 and does not exceed 1 in. ofaxial movement at the connector and subjected to a hydrostaticpressure of 10 psi (23 ft.) for 10 min.7.2.5 Note: Pressure is not prohibited from being relievedwhile deflecting or loading te
43、st section.7.3 Leakage shall be construed to mean freely drippingwater emanating at the interface between the connector andbase of the manhole or wastewater structure, or the pipe;between the connector and the filler rings; or through the bodyof the connector and the filler rings; or through the bod
44、y of theconnector itself.7.4 Moisture appearing at random locations on the base ofthe outlet in the form of patches or beads adhering to thesurfaces shall not be considered leakage.7.5 A delay of up to 24 h is not prohibited prior to makingobservations of leakage.8. Product Marking8.1 Each connector
45、 shall be marked legibly by the connectormanufacturer with his trade name and the size designation orpart number.9. Keywords9.1 definitions; design test method; marking; material re-quirements acceptance criteria; product marking; resilient con-nectorFIG. 1 Shear Test RequirementsC923 08 (2013)13AST
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