624.154.3.C12.46.666.982.4.033.17 JAPANESE INDUSTRIAL STANDARD Pretensioned Spun Concrete Pile © JIS A 5335 – 1979 Translated and published By Japanese Standards Association Printed in Japan A 5335 - 1979 JAPANESE INDUSTRIAL STANDARD Pretensioned Spun Concrete Pile Scope: This Japanese Industrial Standard specified the centrifugally spun prestressed concrete piles manufactured by pretensioning and spinning process, hereinafter referred to as the “PC piles” Remark: In this standard, the units and numerical values given in { } are in accordance with the International System of Units ( SI ), and are given for reference only Applicable Standards: JIS A 1108 – Method of Test for Compressive Strength of Concrete JIS A 1132 – Method of Marking and Curing Concrete Specimens JIS G 3101 – Roller Steel for General Structure JIS G 3109 – Steel Bar for Prestressed Concrete JIS G 3112 – Steel Bars for Concrete Reinforcement JIS G 3521 – Hard Drawn Steel Wire JIS G 3532 – Iron Wires JIS G 3536 – Uncoated Stress-Relieved Steel Wire and Strand for Prestressed Concrete JIS R 5210 – Portland Cement JIS R 5211 – Portland Blast-furnace Slag Cement JIS R 5313 – Portland Fly-ash Cement Reference Standard: JIS Z 8401 – Rules for Rounding Off of Numerical Values A 5335 - 1979 Classification The PC piles shall be classified into Class A, Class B, Class C depending on the value of cracking bending moment, as given in Table Table Class A B C A B C A B C A B C A B C A B C A B C A B C A B C A B C Cracking bending moment tf.m (KN/m) 2.5 3.5 4.0 3.5 5.0 6.0 5.5 7.5 9.0 7.5 11.0 12.5 10.5 15.0 17.0 17.0 25.0 29.0 27.0 38.0 45.0 40.0 55.0 65.0 75.0 105.0 120.0 120.0 170.0 200.0 {24.5} {34.3} {39.2} {34.3} {49.0} {58.8} {53.9} {73.6} {88.3} {24.5} {107.9} {122.6} {103.0} {147.1} {166.7} {166.7} {245.2} {284.4} {264.8} {372.7} {441.3} {392.3} {559.4} {637.4} {735.5} {1029.6} {1176.8} {1176.8} {1667.1} {1961.3} Outside Diameter (mm) Thick -ness 10 11 12 13 14 15 300 60 O O O O O O O - - 350 65 O O O O O O O O O 400 75 O O O O O O O O O 450 80 O O O O O O O O O 500 90 O O O O O O O O O 600 100 O O O O O O O O O 700 110 O O O O O O O - - 800 120 O O O O - - - - - 1000 140 O O O O - - - - - 1200 150 O O - - - - - - - Length (m) A 5335 - 1979 Quality 3.1 Appearance: The PC piles shall be free from defects such as detrimental flaws or cracks 3.2 Bending Strength 3.2.1 Main Body: The main body of the PC piles shall be subjected to the bending strength test specified in 3.1, and shall withstand the cracking bending moment given in Table without showing any cracks (1) The breaking bending moment shall be not less than 1.5 times the cracking bending moment given in Table for Class A, not less than 1.8 times for Class B and not less than 2.0 times for Class C Note (1) The crack generally discernible by naked eyes is about 0.05 mm wide 3.2.2 Jointing End The jointing end shall be as follows: (1) The bending strength of jointing end shall be not less than the bending strength specified in 3.2.1 (2) The deflection and the deflection curve when the bending moment of the jointing end has reached the cracking bending moment given in Table in the bending strength test of jointing end shall be approximately equal to those measured prior to test for the PC pile which is not fitted with jointing end Shape and Dimensions: 4.1 Shape: The PC pile shall be composed of the main body of hollow cylindrical shape as shown in Fig 1, and shall have the suitable pointed end (2) jointing ends (3) or head (4), as necessary The outside diameter and wall thickness of main body shall be uniform in every cross section over the whole length Fig Length Wall thickness Head or jointing end Pointed end or jointing end Notes: (2) There are various types of pointer end, e.g closed type, open type, etc Its length shall be included in that of the PC pile (3) The length of jointing end shall be included in that of the PC pile (4) The length of head shall be included in that of the PC pile 4 A 5335 - 1979 4.2 Dimensions: The dimensions of the PC piles shall conform to Table! and the dimensional tolerances to Table Table Unit: mm Tolerance Outside diameter 300 to 600 700 to 1200 Length ± 0.3 (%) of the length of PC pile Outside diameter +5 -5 +7 -4 Wall thickness ÷ Not specified -1 Remark The outside diameter of PC pile is defined as the average of two measurements taken along the axes at right angle, to each other in a cross section The wall thickness of PC is defined as the average of two measurements taken along the axes at right angle, to each other in a cross section Materials: 5.1 Cement: The cement used shall be equal to or superior to it specified in JIS R 5210; JIS R 5211 or JIS R 5213 5.2 Aggregates: Aggregates shall be clean, rigid and durable, and shall not contain any detrimental amount of dust, mud, salts, organism or else The maximum size of coarse aggregate shall be not more than 30 mm and not more than 2/5 of the wall thickness of PC pile 5.3 Water: The water shall not contain any detrimental amount of oil, acids, salts, organism or else 5.4 Admixtures: Admixtures, if used, shall be of such nature that will not give adverse effect to the product Calcium chloride shall not be used 5.5 PC Steel: The PC steel used for PC piles shall conform to either of the following: (1) Deformed bar specified in JIS G 3109 (2) JIS G 3536 5.6 Reinforcement: The reinforcement used for PC piles shall conform to any of the following or be equivalent or it in mechanical properties (1) JIS G 3112 (2) JIS G 3101 (3) JIS G 3521 (4) Ordinary iron wires specified in JIS G 3532 A 5335 - 1979 Manufacture: 6.1 PC Steels and Reinforcement: 6.1.1 The PC steels and reinforcement in axial direction shall have a reinforcement ratio not less than 0.4% in the aggregate cross-sectional area, and shall be arranged as uniformly as practicable round the concentric circumference in every cross section of the PC pile, in due consideration of minimizing the variation of bending strength of the PC pile by radial direction The clearance between the PC steels and reinforcement shall be not less than steel diameter and, at the same time, not less than 4/3 times the largest size of the coarse aggregates 6.1.2 The spiral additional bars shall be arranged outside the axial PC steels and reinforcement The additional bars shall be not less than mm in diameter and be arranged at a pitch not more than 150mm 6.1.3 The covering shall be not less than 15 mm 6.1.4 For the PC steels and reinforcement, before being set up, free rust, oil, etc which may hinder the adhesion of concrete shall be removed and they shall be set up in such a manner that they are fixed in the right position 6.2 Concrete: 6.2.1 The quality of concrete used for manufacturing the PC piles shall be not less than 500kgf/cm2 (4.90 KN/cm2) in compressive strength when tested for a specimen cured in the same way as the product The compressive strength testing shall be made for the specimen of 10 cm in diameter and 20cm in height in accordance with JIS A 1132 and JIS A 1108 6.2.2 The materials used for the concrete shall be measured by mass Water and liquid admixtures may be measured by volume 6.2.3 The concrete shall be mixed thoroughly in a concrete mixer 6.3 Forming: 6.3.1 The PC piles shall be formed according to the following procedure: Position the set up PC steels and reinforcement in the mould, pour the concrete in it so as the wall thickness of pile will be uniform, and compact the concrete into shape by centrifugal force Before the process abovementioned, the PC steels shall be pretensioned to the required stress 6.3.2 The pointed end, jointing, ends or head, if fined to the PC pile, shall be in correct position, and be fitted to make integral part with the body 6 A 5335 - 1979 6.4 Curing: The curing shall be carried out by such a method that may not affect adversary the quality of the product 6.5 Method of Prestressing: 6.5.1 The PC steels shall be strained in right positions, and the both ends shall be fixed perfectly so as not to loosen the steels until they are prestressed 6.5.2 The initial straining force shall be enough to cause the required effective prestress, and be not more than 0.7 time the tensile load or not more than 0.8 time the yield load of the PC steel 6.5.3 The prestress shall be introduced gradually 6.5.4 The compressive strength of concrete when it is prestressed shall be not less than times the prestress given and not less than 250 kgf/cm2 (2.45 KN/cm2) In this case, the compressive strength testing shall be made in accordance with JIS A 1108 for specimen of 10 cm in diameter and 20 cm in height cured in the same manner as for the product Jointing End: 7.1 The jointing end of PC pile shall be of a construction having equivalent performance to the main body 7.2 The end of PC steels shall be fixed to the metal parts at the jointing ends 7.3 The jointing end shall be made so that its end face is perpendicular the longitudinal axis of the PC pile 7.4 The tolerance on outside diameter of the jointing end shall be within $0.5 mm and $3 mm to the outside diameter of PC pile specified in Table The difference between the outside diameters of joint of the piles when jointed together shall be not more than 2mm Bending Strength Test: 8.1 The bending strength test of main body shall be made by the application of vertical load P to the middle center of span, on the PC pile laid on two supports which has a span equal to 3/5 of its length, as shown in Fig Any countermeasure may be taken to prevent the occurrence of local fractures at the loading or supporting points before the PC pile breaks by bending The bending moment shall be calculated from the following equation: A 5335 - 1979 M= Where: M: P: L: m: q: P ⎛3 ⎞ qmL$ ⎜ L −1⎟ 4 ⎝5 ⎠ bending moment (tf.m) (kN.m) load (tf) (kN) length of PC pile (m) mass of PC pile (t) (see Reference Table) acceleration due to gravity (1 tf/t) (9.81 m/s2) Fig Loading method P Load 0.5m 0.5m 3/10L 3/10L 1/5L Span 3/5L 1/5L 8.2 The breaking bending moment shall be obtained from the equation in 8.1 using the largest value of the load P observed until the PC pile breaks 8.3 The bending strength test of joint shall be made in accordance with 8.1, provided that the joint is positioned at the center of the span Inspection: 9.1 The inspection shall be made on appearance, shape, dimensions, bending strength of main body, bending strength of jointing end, arrangement of PC steels and reinforcement 9.2 The inspection on appearance, shape and dimensions shall be made for whole products, and those which meet the requirements of 3.1 and shall be decided as acceptable 9.3 Bending Strength of Main Body and Jointing End: 9.3.1 The cracking inspection for main body shall be made by making the cracking testing accordance with 8.1 for the two PC piles sampled from a lot of PC piles, and the whole lot shall be decided as acceptable, if both two meet the requirements of 3.2 In the case where either of the two falls to meet the requirements of 3.2, additional four piles sampled from the lot shall be subjected to cracking test, and the whole lot shall be decided as acceptable, if all the four meet the requirements The size of lot shall be determined upon agreement between the parties concerned 8 A 5335 - 1979 9.3.2 In the breaking inspection of main body, either of the initial two samples shall be tested in accordance with 8.1, and the whole lot shall be decided as acceptable, if they meet the requirements of 3.2 The breaking inspection may be omitted, subject to an agreement between the parties concerned 9.3.3 The jointing end shall be inspected similarly to the main body This inspection, however, may be omitted, subject to an agreement between the parties concerned 9.4 The inspection on arrangement of the PC steels and reinforcement shall be made for the PC pile which has been subjected to the breaking inspection, and the arrangement shall be decided as acceptable, if it meets the requirement of 6.1 On that occasion, the wall thickness of the broken part in the PC pile shall also be inspected 10 Designation: The PC piles shall be designated in the order of the symbol PR indicating pretension process, classification, outside diameter (mm) and length (m) Example: PR-A 500 - 11 11 Marking: The PC piles shall be marked with the following particulars: (1) Designation (2) Manufacture’ s name or its abbreviation (3) Name or abbreviation of manufacturing works (4) Date of forming A 5335 - 1979 Reference: The following Reference Table shows the long-term acceptable axial loads and the masses of the PC piles for the reference of practical use The masses of PC Piles have been calculated from the following equation, on the assumption that the mass for unit volume of PC pile is 2.6 t/m3 and π = 3.14, and rounded off to the second decimal place in accordance with JIS Z 8401 m = 2.6 π t (D - t)L Where: m: D: t: L: mass (t) outside diameter (m) wall thickness (m) length (m) Reference Table Outside diameter mm Long term allowable axial load tf (kN) Class A Class B Mass Class C 7m 8m 9m 10m 11m 12m 13m 14m 15m 300 50 {490} 45 {441} 40 {392} 0.82 0.94 1.06 1.18 1.29 1.41 1.53 - - 350 60 {588} 55 {539} 55 {539} 1.06 1.21 1.36 1.51 1.66 1.81 1.97 2.12 2.27 400 80 {785} 75 {736} 70 {686} 1.39 1.69 1.79 1.99 2.19 2.39 2.59 2.79 2.98 450 100 {981} 90 {883} 85 {834} 1.69 1.93 2.17 2.42 2.66 2.90 3.14 3.38 3.62 500 125 {1226} 115 {1128} 105 {1030} 2.11 2.41 2.71 3.01 3.31 3.62 3.92 4.22 4.52 600 170 {1667} 155 {1520} 145 {1422} 2.86 3.27 3.67 4.08 4.49 4.90 5.31 5.71 6.12 700 220 {2158} 200 {1961} 190 {1863} 3.71 4.24 4.77 5.30 5.83 6.36 6.89 - - 800 280 {2146} 250 {2452} 235 {2305} 4.66 5.33 6.00 6.66 - - - - - 1000 415 {4070} 370 {3629} 350 {3432} 6.88 7.86 8.85 9.83 - - - - - 1200 540 {5296} 490 {4805} 465 {4650} 9.00 10.29 - - - - - - - A 5445-1979 Edition Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1968-06-01 Date of Revision: 1979-11-01 Date of Public Notice in Official Gazette: 1979-11-30 Investigated by: Japanese Industrial Standards Committee Divisional Council on Civil Engineering This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan © JSA, 1980