1、Designation: C 923M 08METRICStandard Specification forResilient Connectors Between Reinforced Concrete ManholeStructures, Pipes, and Laterals Metric1This standard is issued under the fixed designation C 923M; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the minimum performance andmaterial requirements for
3、resilient connectors used for connec-tions between precast reinforced concrete manholes conform-ing to Specification C 478 and pipes, and between precastreinforced concrete pipe and laterals.1.1.1 These connectors are designed to minimize leakagebetween the pipe and manhole, and between the pipe and
4、lateral.1.2 This specification is the metric counterpart of Specifi-cation C 923.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 70 kPa (7.1 m)without leakag
5、e when tested in accordance with Section 7. Infiltration orexfiltration 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 install
6、ed pipeline and system.1.3 The following precautionary caveat pertains 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 estab
7、lish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use. For a specific precaution statement, see7.2.5.2. Referenced Documents2.1 ASTM Standards:2A 493 Specification for Stainless Steel Wire and Wire Rodsfor Cold Heading and Cold ForgingA 6
8、66 Specification for Annealed or Cold-Worked Austen-itic Stainless Steel Sheet, Strip, Plate, and Flat BarC 478 Specification for Precast Reinforced Concrete Man-hole SectionsC 822 Terminology Relating to Concrete Pipe and RelatedProductsC 913 Specification for Precast Concrete Water and Waste-water
9、 StructuresD 395 Test Methods for Rubber PropertyCompressionSetD 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 471 Test Method for Rubber PropertyEffect of LiquidsD 543 Practices for Evaluating the Resistance of Plastics toChemical ReagentsD 573 Test Method for RubberD
10、eterioration in an AirOvenD 624 Test Method for Tear Strength of ConventionalVulcanized Rubber and Thermoplastic ElastomersD 883 Terminology Relating to PlasticsD 1149 Test Methods for Rubber DeteriorationCrackingin an Ozone Controlled EnvironmentD 1566 Terminology Relating to RubberD 2137 Test Meth
11、ods for Rubber PropertyBrittlenessPoint of Flexible Polymers and Coated FabricsD 2240 Test Method for Rubber PropertyDurometerHardnessNOTE 2For more information about wastewater structures, see Speci-fication C 913.3. Terminology3.1 Definitions:3.1.1 Terms relating to plastics and rubber shall be as
12、defined in Terminologies D 883 and D 1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, andrelated products shall be as defined in Terminology C 822 andas modified in 3.1.3-3.1.6.1This specification is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the d
13、irect responsibility of Subcommittee C13.06 on Manholesand Specials.Current edition approved March 1, 2008. Published April 2008. Originallyapproved in 1980. Last previous edition approved in 2007 as C 923M 07.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custo
14、mer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.3 connectorthe entire assembly i
15、ncluding resilientseals and metallic or nonmetallic mechanical devices, if any,used therein.3.1.4 lateralthe small diameter pipe connected to themain line.3.1.5 pipethe inlet or outlet pipe connected to the man-hole.3.1.6 pipe stuba capped or plugged pipe, or section ofpipe, installed in a manhole t
16、o allow for future connections.4. Materials and 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 s
17、pliceis used in the manufacture of the seal, 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
18、or manholeshall be made from a material or materials in combination thatwill ensure durability, strength, resistance to corrosion, andhave properties that will ensure continued resistance to leak-age. All metallic mechanical devices and bolt assemblies usedto mechanically deform resilient materials
19、shall be constructedof corrosion resistant materials meeting the physical propertiesand chemical composition requirements of SpecificationsA 493 and A 666, Type 302 through Type 316.NOTE 3Experience has shown that successful performance of thisproduct depends on the type of bedding and backfill and
20、the care in thefield installation of the manhole and connecting pipes. The owner iscautioned 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 connec-tor and the wall
21、 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 pipe andthe pipe openi
22、ng 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 outside ofthe pipe. Re
23、silient 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 effect mechanicalseals s
24、hall 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. The seal between thec
25、onnector 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 outside of thepipe.
26、 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 maintaining a resilienthydro
27、static seal under the performance conditions in accor-dance with Section 7. Devices used to effect mechanical sealsshall conform to the requirements specified in Section 4.5.3 Pipe StubsOwners shall require that all pipe stubsinstalled, to allow for future connections to manhole structures,be mechan
28、ically restrained from movement by means otherthan, and in addition to, the resilient connectors.6. Test Specimens6.1 The owner shall not be prohibited from selecting testspecimens representative of the connectors to be used from themanhole or pipe manufacturers stock.6.2 Specimens up to 0.25 % of t
29、he number of connectors tobe furnished are not prohibited from being selected for testing.At least one connector shall be tested for each diameterconnector furnished.TABLE 1 Resilient Material TestsTest Test RequirementsAASTM Test MethodChemical resistance: D 543, at 22C for 48 h1 N sulfuric acid no
30、 weight loss1 N hydrochloric acid no weight lossTensile strength 8.5 MPa, min D 412Elongation at break 350%, minHardnessB6 5 from the connector manufacturers specified hardness D 2240 (Shore A durometer)Accelerated oven-aging decrease of 15%, max, of original tensile strength, de-crease of 20%, max,
31、 of elongationD 573,706 1C for 7 daysCompression set decrease of 25%, max, of original deflection D 395, Method B, at 70C for 22 hWater absorption increase of 10%, max, of original by weight D 471, immerse 19 by 25-mm specimen in distilledwater at 70C for 48 hOzone resistance rating 0 D 1149Low-temp
32、erature brittle point no fracture at 40C D 2137Tear resistance 34 kN/m D 624, Die BASpecimens shall be prepared from connector specimens, and shall not be prepared from laboratory slabs or by direct molding.BThe connector manufacturer shall select the hardness appropriate for each component of the c
33、onnector. Thereafter, the hardness shall comply within the tolerancesin Table 1.C923M0826.3 Damaged connectors shall not be used for testing.7. Test Methods and Requirements7.1 Install a pipe and the resilient connector to be tested inthe manhole base 1200 mm inside diameter or smaller. Subjectthe a
34、ssembly to a hydrostatic pressure of 70 kPa (7.1 m) at thecenter line of the connector for a period of 10 min. Restrain thepipe against axial movement during the tests.NOTE 4The user of this specification is advised that if manhole basesgreater than 1200 mm inside diameter are required to accommodat
35、e largediameter connectors for the test, all safety requirements and proceduresshould be reviewed prior to the test.7.1.1 Install a lateral and resilient connector to be tested intothe pipe. Subject the assembly to a hydrostatic pressure of 70kPa (7.1 m) at the center line of the connector for a per
36、iod of10 min. Restrain the lateral against axial movement during thetests.7.2 There shall be no leakage under any of the followingconditions:7.2.1 Straight alignment of the pipe/lateral.7.2.2 Axial deflection of the pipe/lateral of at least 7 in anydirection.7.2.3 When the pipe is loaded in shear in
37、 accordance withthe requirements shown in Fig. 1.7.2.4 When the lateral is loaded in shear in accordance withthe loading requirements of Fig. 1 and does not exceed 25 mmof axial movement at the connector.7.2.5 Note: Pressure is not prohibited from be relievedwhile deflecting or loading test section.
38、7.3 Leakage shall be construed to mean freely drippingwater emanating at the interface between the connector andeither the manhole base, the pipe, or the lateral; between theconnector and the filler rings; or through the body of theconnector and the filler rings; or through the body of theconnector
39、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 shall be marked l
40、egibly 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; resilientconnectorASTM International takes no position respecting the validity of any p
41、atent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revisi
42、on at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your co
43、mments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrigh
44、ted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. 1 Shear Test RequirementsC923M083
