1、Designation: C923M 08b (Reapproved 2013)C923M 18Standard Specification forResilient Connectors Between Reinforced Concrete ManholeStructures, Pipes, and Laterals (Metric)1This standard is issued under the fixed designation C923M; the number immediately following the designation indicates the year of
2、original adoption or, 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.1. Scope1.1 This specification covers the minimum performance and mater
3、ial requirements for resilient connectors used for connectionsbetween precast reinforced concrete manholes conforming to Specification C478 and pipes, and between precast reinforcedconcrete pipe and laterals.1.1.1 These connectors are designed to minimize leakage between the pipe and manhole, and be
4、tween the pipe and lateral.1.2 This specification is the SI companion to Specification C923.NOTE 1This specification covers the design, material, and performance of the resilient connection only. Connections covered by this specificationare adequate for hydrostatic pressures up to 7090 kPa (7.1(9.1
5、m) without leakage when tested in accordance with Section 7. Infiltration or exfiltrationquantities for an installed system are dependent upon many factors other than the connections between manhole structures and pipe, and allowablequantities must be covered by other specifications and suitable tes
6、ting of the installed pipeline and system.1.3 The following precautionary caveat pertains only to the test methods portion, Section 7, of this specification: This standarddoes not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of
7、thisstandard to establish appropriate safety safety, health, and healthenvironmental practices and determine the applicability ofregulatory limitations prior to use. For a specific precaution statement, see 7.2.5.1.4 This international standard was developed in accordance with internationally recogn
8、ized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A493 Specification for S
9、tainless Steel Wire and Wire Rods for Cold Heading and Cold ForgingA666 Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat BarC478 Specification for Circular Precast Reinforced Concrete Manhole SectionsC822 Terminology Relating to Concrete Pipe and Rel
10、ated ProductsC913 Specification for Precast Concrete Water and Wastewater StructuresD395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplastic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD543 Practices for Evaluating the Re
11、sistance of Plastics to Chemical ReagentsD573 Test Method for RubberDeterioration in an Air OvenD624 Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic ElastomersD883 Terminology Relating to PlasticsD1149 Test Methods for Rubber DeteriorationCracking in an Ozone Contro
12、lled EnvironmentD1566 Terminology Relating to RubberD2137 Test Methods for Rubber PropertyBrittleness Point of Flexible Polymers and Coated FabricsD2240 Test Method for Rubber PropertyDurometer HardnessNOTE 2For more information about wastewater structures, see Specification C913.1 This specificatio
13、n is under the jurisdiction ofASTM Committee C13 on Concrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholes and Specials.Current edition approved July 1, 2013Sept. 1, 2018. Published July 2013October 2018. Originally approved in 1980. Last previous edition approved in 20082
14、013 asC923M 08b.C923M 08b(2013). DOI: 10.1520/C0923M-08BR13.10.1520/C0923M-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on
15、the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users
16、consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 Definitions:3
17、.1.1 Terms relating to plastics and rubber shall be as defined in Terminologies D883 and D1566, respectively.3.1.2 Terms relating to precast concrete pipe, manholes, and related products shall be as defined in Terminology C822 and asmodified in 3.1.3 3.1.6.3.1.3 connectorthe entire assembly includin
18、g resilient seals and metallic or nonmetallic mechanical devices, if any, usedtherein.3.1.4 lateralthe small diameter pipe connected to the main line.line pipe.3.1.5 pipethe inlet or outlet pipe connected to the manhole.3.1.6 pipe stuba capped or plugged pipe, or short section of pipe, installed in
19、a manhole to allow for future connections.thestructure as an inlet or outlet pipe, for future connection.4. Materials and Manufacture4.1 All materials shall conform to the following requirements:4.1.1 Resilient materials for connectors and filler rings shall be manufactured from natural or synthetic
20、 rubber and shall conformto the requirements prescribed in Table 1. If a splice is used in the manufacture of the seal, its strength shall be such that the sealshall withstand a 180 bend with no visible separation.4.2 Mechanical DevicesExpansion rings, tension bands, and take-up devices used for mec
21、hanically compressing the resilientportion of the connector against the pipe or manhole pipe, manhole, or wastewater structure; shall be made from a material ormaterials in combination that will ensure durability, strength, resistance to corrosion, and have properties that will ensure continuedresis
22、tance to leakage. All metallic mechanical devices and bolt assemblies used to mechanically deform resilient materials shallbe constructed of corrosion resistant materials meeting the physical properties and chemical composition requirements ofSpecifications A493 and A666, Type 302 through Type 316.N
23、OTE 3Experience has shown that successful performance of this product depends on the type of bedding and backfill and the care in the fieldinstallation of the manhole or wastewater structure and connecting pipes. The owner is cautioned to require inspection at the construction site.5. Principles of
24、Design5.1 The design of the connector shall be such that positive seal is accomplished at two locations: (1) between the connector andthe wall of the manhole or wastewater structure and (2) between the connector and the pipe. The seal between the connector andthe wall of the manhole or wastewater st
25、ructure shall be made by either mechanical means, compression of the resilient materialbetween the outside surface of the pipe and the pipe opening in the wall of the manhole or wastewater structure, or by casting theconnector integrally with the wall of the manhole or wastewater structure. The seal
26、 between the connector and the pipe shall bemade by mechanical means or by compression of the resilient material against the outside of the pipe. Resilient filler rings are notprohibited from being used between the pipe and the connector to provide a seal. Whichever design is used, it shall be capab
27、leof maintaining a resilient, hydrostatic seal under the performance conditions in accordance with Section 7. Devices used to effectmechanical seals shall conform to the requirements specified in Section 4.TABLE 1 Resilient Material TestsTest Test RequirementsA ASTM Test MethodChemical resistance: D
28、543, at 22C for 48 h1 N sulfuric acid no weight loss1 N hydrochloric acid no weight lossTensile strength 8.5 MPa, min D412Tensile strength 8.3 MPa, min D412Elongation at break 350%, minHardnessB 5 from the connector manufacturers specified hardness D2240 (Shore A durometer)Accelerated oven-aging dec
29、rease of 15%, max, of original tensile strength, de-crease 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 of 10%, max, of original by weight D471, immerse 19 by 25-mm specimen in di
30、stilledwater at 70C for 48 hWater absorption increase of 10%, max, of original by weight D471, immerse 25 by 50-mm specimen in distilledwater at 70C for 48 hOzone resistance rating 0 D1149Low-temperature brittle point no fracture at 40C D2137Tear resistance 34 kN/m D624, Die BTear resistance 35 kN/m
31、 D624, Die BASpecimens shall be prepared from connector specimens, and shall not be prepared from laboratory slabs or by direct molding.B The connector manufacturer shall select the hardness appropriate for each component of the connector. Thereafter, the hardness shall comply within the tolerances
32、inTable 1.C923M 1825.2 For lateral to pipe connectors, the design of the connector shall be such that a positive seal is accomplished at two locations:(1) between the connector and the pipe wall and (2) between the connector and the lateral. The seal between the connector andthe pipe wall shall be m
33、ade by either mechanical means, compression, or by casting the connector integrally with the pipe wall.The seal between the connector and the lateral shall be made by either mechanical means or by compression of the resilientmaterial against the outside of the pipe. Resilient filler rings are not pr
34、ohibited from being used between the lateral and theconnector to provide a seal. Connector design must not allow either lateral or connector to extend past the cylindrical plane of thepipe inside diameter. The connector shall be capable of maintaining a resilient hydrostatic seal under the performan
35、ce conditionsin accordance with Section 7. Devices used to effect mechanical seals shall conform to the requirements specified in Section 4.5.3 Pipe StubsOwners shall require that all pipe stubs installed, to allow for future connections to manhole structures, bemechanically restrained from movement
36、 by means other than, and in addition to, the resilient connectors.6. Basis of Acceptance6.1 For diameter 900 mm and smaller, at least one connector shall be tested for each 150 mm increment in diameter. Fordiameters larger than 900 mm, at least one connector shall be tested for each 300 mm incremen
37、t in diameter.6.2 The acceptability of the resilient connector shall be determined by the results of the physical tests prescribed in thisspecification, if and where required, and by inspection, to determine whether the connector conforms to the specification withregards to design and freedom from d
38、efects.6.3 When requested, a current certification shall be furnished as the basis of acceptance. The certification shall consist of theconnector manufacturers test report, or statement by the manufacturer, accompanied by a copy of the test results, that the resilientconnector has been tested and in
39、spected in accordance with the provisions of Section 4 and Section 7. Each certification sofurnished shall be signed by the connector manufacturer or an authorized agentNOTE 4Certification shall be deemed current, if it represents present design, and bears a date that is no more than five years olde
40、r than the currentdate.7. Test Methods and Requirements7.1 Install a pipepipe(s) and the resilient connectorconnector(s) to be tested in the manhole base 1200 mm inside diameter orsmaller. base section of a manhole or wastewater structure. Subject the assembly to a the prescribed hydrostatic pressur
41、e of 70in7.2 kPa (7.1 m) at the center line centerline of the connector for a period of 10 min. min for each test condition. Restrain the pipeagainst axial movement during the tests.NOTE 5The user of this specification is advised that if manhole bases greater than 1200 mm inside diameter are require
42、d to accommodate largediameter connectors for the test, all safety requirements and procedures should be reviewed prior to the test.7.1.1 Install a lateral and resilient connector to be tested into the pipe. Subject the assembly to a the prescribed hydrostaticpressure of 70in 7.2 kPa (7.1 m) at the
43、center line centerline of the connector for a period of 10 min. min for each test condition.Restrain the lateral against axial movement during the tests.7.2 There shall be no leakage under any of the following conditions:7.2.1 Straight alignment of the pipe/lateral.pipe(s)/lateral(s) subjected to a
44、hydrostatic pressure of 90 kPa (9.2 m) for 10 min.7.2.2 Axial deflection of the pipe/lateral of pipe(s)/lateral(s). Upon completion of the test for straight alignment in 7.2.1 thepipe(s)/lateral(s) shall be axially deflected at least 7 in any direction.direction and subjected to a hydrostatic pressu
45、re of 70 kPa(7.1 m) for 10 min.7.2.3 When the pipe is loaded in shear in accordance with the requirements shown in Fig. 1. and subjected to a hydrostaticpressure of 70 kPa (7.1 m) for 10 min.7.2.4 When the lateral is loaded in shear in accordance with the loading requirements of Fig. 1 and does not
46、exceed 25 mm ofaxial movement at the connector.connector and subjected to a hydrostatic pressure of 70 kPa (7.1 m) for 10 min.7.2.5 Note: Pressure is not prohibited from being relieved while deflecting or loading test section.FIG. 1 Shear Test RequirementsC923M 1837.3 Leakage shall be construed to m
47、ean freely dripping water emanating at the interface between the connector and either themanhole base, the pipe, or the lateral; between the connector and the filler rings; or through the body of the connector and the fillerrings; or through the body of the connector itself.7.4 Moisture appearing at
48、 random locations on the base of the outlet in the form of patches or beads adhering to the surfacesshall not be considered leakage.7.5 A delay of up to 24 h is not prohibited prior to making observations of leakage.8. Product Marking8.1 Each connector shall be marked legibly by the connector manufa
49、cturer with his trade name and the size designation or partnumber.9. Keywords9.1 definitions; design test method; marking; material requirements acceptance criteria; product marking; resilient connectorASTM International takes no position respecting the validity of any patent 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 stand
