DIN EN 523 pdf free download

DIN EN 523 pdf free download. Steel strip sheaths for prestressing tendons.
3 Terms and definitions For the purpose of this European Standard the following terms and definition apply. 3.1 type of sheath sheaths are designated by the manufacturer according to specific delivery form having certain features, e.g. production procedure (welded or interlocked), shape of profile, etc. 3.2 connectors (couplers) connectors are specific devices to join sheath sections. They are usually made from cut ends of sheaths with the same profile type but with larger diameter (see 5.2) 3.3 stiffener is an additional components whose purpose is to increase the lateral load strength of the sheaths at supporting points, e.g. semi-circular sheathing sections placed between supports and tendons
5 Requirements 5.1 Sheaths 5.1.1 General requirements Sheaths shall have sufficient resistance against the mechanical actions and environmental exposure during storage, transport and construction period. Sheaths are deemed to be resistant against: – mechanical actions, if they fulfil the requirements of clause 5.1.5to 5.1.8; . – environmental exposure, if the requirements of 5.1.2 and clause 7 are fulilled and the measurements recommended for handling the sheaths on site in accordance with ENV 13670-1 are taken into account.Sheaths shall have a corrugated profile (see Figure 1) to provide a sufficient mechanical bond with the concrete externally and the grout internally. Sheaths shall be leaktight (see 5.1.9). The sheaths and their connectors shall be designed in such a way as to allow this proper sealing of the joints. 5.1.2 Steel strip Sheaths shall be made from rolled steel strip conforming to EN 10139, ISO 6932 or specified steel with similar properties. The nominal thickness of the steel strip shall be not less than the values given in Table 1, lines 1a and 1b. 5.1.3 Tolerances (ovality) Deviations from the mean values of the internal diameter of any cross-section of the sheaths determined according to EN 524-1 shall not exceed土1 % or土0,5 mm, whichever is the greater. 5.1.4 Relative volume of the profile The relative volume of the profile Vrel determined in accordance with EN 524-1 shall be not less than 0,08 cm*/cm2. For nominal internal diameters greater than 25 mm, the height of the profile shall be not less than 2,5 mm (see EN 524-1). 5.1.5 Flexural behaviour The relative load Frel = Fpld in N/mm and the load Fpl at the beginning of plastic deformation shall be determined in accordance with EN 524-2. 5.1.6 Flexibility When tested by means of the to-and-fro bending test described in EN 524- 3, flexibility is sufficient if, after the bending test, no significant deformations of the corrugation appear so that the plunger can push in the specimen over its whole length. A straightening of the specimen by means of the tensile load test (see EN 524-5) is permitted. 5.1.7 Lateral load resistance The ireversible reduction of the internal diameter shall not exceed 10 % or 5 mm whichever is the smaller when the loads given in Table 1, lines 4a to 4c are applied according to EN 524-4. If any type of sheaths of class 1 withstands the loadF = 1500 N without a stiffener a test with lower forces in accordance with Table 1, line 4a is not required. 5.1.8 Tensile load resistance When loaded in accordance with EN 524-5, the tensile load strength is sufficient if the sleeve coupling (comprising sheaths and the corresponding coupler) does not fail by complete separation under the test loads specified in Table 1, 5.1.9 Leaktightness When tested in accordance with EN 524-6, using a specimen tested earlier for flexibility, lateral load resistance and tensile load resistance, the water loss shall not exceed the values given in Table 1, line 6.DIN EN 523 pdf download.