Order of installation, tension cable girder i24m I Some provisions of materials and equipment trension cable I.1 Main section - Compressive strength of samples prismatich 28 days: f’ c=40MPa I.2 Cable - Cable use type strand plys Garde 270 by standard ASTM A416 with specs as follows: + Nominal diameter : D = + Nominal area : A = + Yied strength : fpy = 1717.07 Mpa + Tensile strength : fpy = 1957.7 Mpa + Max tensile load : Ppu = 174.7 KN + Modulus of elasticity Cable : Ep = 1.98x105 Mpa Nam Number strand e 12.7mm in cable 12 Anchor 12.7 mm 99.5 mm2 Load tension Nomianal (KN) area (mm2) -12 1596 1185 12 -12 1596 1185 12 -12 1596 1185 12 -12 1596 1185 - Cables must be preserved in sheltered, dry ventilated area, 30cm stats above the ground - Cable while being used must have a certificate used by the manufacturer, the Owner and design consultant approved - Need to conduct experimental testing off steel cable in accordance with the requirements of design documents for the target: Max tension load, modulus of elasticity, yied strength, elongation, the size of each wire in the strand, surface current Any change that does not comply with the provisions of design documents that must be design agency, investor, concultant supervision accepted in writing may be used I.3 Anchor - Use anchor - Anchors has to enter on the centificate of quantity manufacturers -12 of firm QVM produce cable 12.7mm I.4 Jack - Use jacks 250T symbol YCQ 250Q - Some feature of the jack: + Max tension force : 248 TÊn + Max tension stroke : 200 mm + Tension piston area + Revenues piston area 459.20 cm2 : 280.40 cm2 : - Pump model ZB4-500 - All jacks, pump before being used must be tested II Order rension II.2 Order - Calculation force tension cable - Calculation elongation - Execution cable passing - Tension cable - Finish III.Work III.1 Calculation tension cable The actual force that the tension cable designed as to adjust the jack and gauge a Actual tension cable regardless of the friction adjust jack Jack :YCQ250Q Pump :ZB4-500 Gauge No Symbol :Z06139 Symbol 7013.119 Grade of Reaquired Calculation Actual Fiction force tension pressure tension factor 0.10P 0.20P 0.40P force KN 159.6 319.2 638.4 Mpa 3.48 6.95 13.90 force KN 144.1 0.09712 302.6 53 0.05206 619.5 27 0.02953 13 0.60P 0.80P 1.00P 1.05P 1.10P 957.6 1276.8 1596.0 1675.8 1755.6 20.85 27.80 34.76 36.49 38.23 936.5 0.02202 1253.5 09 0.01826 1570.4 57 0.01601 1649.7 25 0.01558 1728.9 34 0.01519 32 Jack :YCQ250Q Pump :ZB4-500 Gauge No Symbol :Z06180 Symbol 7030.119 Grade of Reaquired Calculation Actual Fiction force tension pressure tension factor 0.10P 0.20P 0.40P 0.60P 0.80P 1.00P 1.05P 1.10P force KN 159.6 319.2 638.4 957.6 1276.8 1596.0 1675.8 1755.6 Mpa 4.51 9.02 18.03 27.05 36.06 45.08 47.33 49.59 force KN 191.2 0.07648 396.7 79 0.04174 807.8 40 0.02437 1218.9 20 0.01858 1630.0 13 0.01568 2041.1 60 0.01394 2143.9 88 0.01361 2246.7 79 0.01331 71 b Actual cable tension regardless of meter calibration Jack :YCQ250Q Pump :ZB4-500 Gauge No Garde of force 0.10P 0.20P 0.40P 0.60P 0.80P 1.00P 1.05P 1.10P Jack :YCQ250Q Pump :ZB4-500 Gauge No Garde of force 0.10P 0.20P 0.40P 0.60P 0.80P 1.00P 1.05P 1.10P Symbol :Z06139 Symbol 7013.119 Reaquired tension force KN 159.6 319.2 638.4 957.6 1276.8 1596.0 1675.8 1755.6 Actual tension force Mpa 3.85 7.33 14.33 21.32 28.32 35.32 37.07 38.82 Symbol :Z06180 Symbol 7030.119 Reaquired tension force KN 159.6 319.2 638.4 957.6 1276.8 1596.0 1675.8 1755.6 Actual tension force Mpa 3.85 7.33 14.33 21.32 28.32 35.32 37.07 38.82 III.2 Calculation elongation a Theory elongation: Formula: l ( σ n σ n1 ) Δ L n Ep - L:Elongation of cable (mm) - Ln: Length of cable (mm) - Ep: Modunlus elasticity, follow testing : Ep =1.96x105 Mpa - n, n+1: Stress of cable at point n and point n+1 n = Pn/Ap n+1 = Pn+1/Ap - Pn, Pn+1 Force tension cable at point n and point n+1 Pi (1 γ) exp(μ α λ l) Pi: Force tension cable Area cross section of cable: F = 1185(mm2) Pn - : Fiction between anchor and jack - : Friction of line cable, (rad-1) - : Angle of the cable line from the anchor point jack(degrees) - : The coefficient of friction between the cable to the pipe, = 0.004 rad/m-1 - L=Ln: Length of cable Calculation length of cable: L(Ln) = 2*(Ltc+L1+L) (with tension) + Ltc: Length of cable consstruction in jack =740 (mm) + L1: The length from the edge girder to the jack ( head jack) - + L: Distance cable length in the girder b Calculation: - Calculation elongation from grade force 0.1P + Elongation of cable form grade 0.1P-1.1 when use type jack YCQ250Q-06139 elongation of cable from grade force Độ dÃn dài theo cÊp lùc calculating sheet/b¶ng tÝnh: elongation of prestressing cable of pci l=24m độ giÃn dài cáp dự ứng lùc dÇm pci l = 24(m) Grade of No/ tension Thứ force/Cấp tự lực căng kéo Required tension force/Lực căng kéo yêu cầu ( KN ) Actual pressure/ áp suất căng kéo thực tế ( MPA ) Cable No.1 Bó sè Cable No.2 Bã sè Cable No.3 Bã số (cm) (cm) (cm) So dây hồi kích Đánh dấu đo dÃn dài So dây hồi kích Đánh dấu đo dÃn dài So dây hồi kích Đánh dấu đo d·n dµi 0.1P 159.6 3.85 0.1P 159.6 3.85 0.2P 319.2 7.33 1.75 1.74 1.61 0.4P 638.4 14.33 5.25 5.22 4.82 0.6P 957.6 21.32 8.75 8.70 8.03 0.8P 1276.8 28.32 12.25 12.17 11.24 1.0P 1596.0 35.32 15.76 15.65 14.45 1.05P 1675.8 37.07 16.63 16.52 15.26 1.10P 1755.6 38.82 17.51 17.39 16.06 + Elongation of cable form grade 0.1P-1.1 when use type jack YCQ250Q-06180 elongation of cable from grade force Độ dÃn dài theo cÊp lùc calculating sheet/b¶ng tÝnh: elongation of prestressing cable of pci l=24m độ giÃn dài cáp dự ứng lực dÇm pci l = 24(m) No/ Grade of Thø tension tự force/Cấp lực căng kéo Required tension force/Lực căng kéo yêu cầu Actual pressure/ áp suất căng kéo thực tế Cable No.1 Bã sè Cable No.2 Bã sè Cable No.3 Bã sè ( KN ) 0.1P 159.6 0.1P 159.6 0.2P 319.2 0.4P 638.4 0.6P 957.6 0.8P 1276.8 1.0P 1596.0 1.05P 1675.8 1.10P 1755.6 ( MPA ) (cm) (cm) (cm) So dây hồi kích Đánh dấu đo dÃn dài So dây hồi kích Đánh dấu đo dÃn dài 1.75 1.74 1.61 5.25 5.22 4.82 8.75 8.70 8.03 12.25 12.17 11.24 15.76 15.65 14.45 16.63 16.52 15.26 17.51 17.39 16.06 So dây 3.85 hồi kích Đánh dấu đo dÃn dµi 3.85 7.33 14.33 21.32 28.32 35.32 37.07 38.82 c Limit elongation: Limit elongation was built from the elongation with the theoretical error (specifications of the project) The value of to determine the upper limit, the theoretical approach IV Order - Cable - Cable - Cable When pulling cable bundles, the pressure jack in not a difference of more than one level Before tension to make sure the size axis coincides with the axis of the tendon at the anchor and head size spleen at night c Order tension and monitor elongation Installation into a cable tension by following the steps order Step 1: First Pump 0,1P0 Close the node anchor on the passive ( tubes closed anchor button and hammer ) Installation cursor measured in the first two active and passive Step 2:Pump to 0,2P0 Marked point track elongation Step 3: Pump to 0,4P0 Measurement of elongation at the initiative, which moved the cursor at the passivity of the tractor, check the results on graph stretched and record monitoring results on the table Step 4: Pump to 0,6P0 Measurement of elongation at the initiative, which moved the cursor at the passivity of the tractor, check the results on graph stretched and record monitoring results on the table Step 5: Pump to 0,8 P0 Measurement of elongation at the initiative, which moved the cursor at the passivity of the tractor, check the results on graph stretched and record monitoring results on the table Step 6: Pump to 1,0 P0 Measurement of elongation at the initiative, which moved the cursor at the passivity of the tractor, check the results on graph stretched and record monitoring results on the table Elongation is calculated by taking elongation at the top of the active minus the displacement of the cursor at the lower size chart stretched to and click to remove The final elongation A0 In the value of elongation in the lower size chart stretched to and click to move The strand is cut the tail and the sleeves of the nozzles are welded Elongation of cbale: Elongation of the tendon to re-adjust based on the area and the actual elactic modulus of the strand from the experimental results Remove jack Exhaust jack to pull jack III.5 Grout pump, finish a Cut the cable anchorages covering b Pump groupting protecting cables + Mix the grout according to gradation of the experiment + Pump grouting 10 ... 13.90 force KN 144.1 0.09712 302. 6 53 0.05206 619.5 27 0 .029 53 13 0.60P 0.80P 1.00P 1.05P 1.10P 957.6 1276.8 1596.0 1675.8 1755.6 20.85 27.80 34.76 36.49 38.23 936.5 0 .022 02 1253.5 09 0.01826 1570.4... approved - Need to conduct experimental testing off steel cable in accordance with the requirements of design documents for the target: Max tension load, modulus of elasticity, yied strength, elongation,... in the strand, surface current Any change that does not comply with the provisions of design documents that must be design agency, investor, concultant supervision accepted in writing may be used