【正文】 teel wire releases or cracks during tension of unbonded reinforcement, the tension shall be relieved. The released or cracked wires shall be no more than 2% of the total in the same section of unbonded reinforcement. 8） During pretensioning, the workers shall stand on both sides of jack to avoid the damage from jack. 9） The method of symmetrical tension shall be adopted. The strict precautions for sealing in the unbonded anchor zone shall be provided. The construction of sealing concrete shall conform to the following requirements: 1） A length of 200mm unbonded reinforcement shall be prepared outside the foundation. Remove the exposed unbonded reinforcement with nontooth saw. If use the oxyacetylene flame to cut it, a length of 250mm shall be prepared. 2） Disperse and bend the prepared unbonded reinforcement. 3） Clean the chips of concrete at both sides of structure and grout the same grade of concrete as the structure. 4） The sealed concrete at ends shall be solid inside and smooth outside. 5） Coat the heating bituminous or other corrosionproof paint on the surface of sealed end of concrete. — 20 。 2） The earthwork around the foundation shall be back filled, tamped and trimmed in time. 3） No any damage and erosive bolt and preembeddedparts occur. 4） Shall clean the water and foreign matter inside the prepared bolt hole. 5） The tolerance deviation of equipment foundation shall conform to the regulations on the table and the table . 6） As for the equipment foundation consisting of many blocks of sole foundation, the tolerance deviation of axis and elevation for each foundation shall be checked according — 14 — to the table . Table . The Tolerance Deviation for Block Equipment Foundation (mm) No. Items Tolerance Deviation 1 Axis position 20 2 Elevation at different level (exclusive of the thickness of grouting surface) 0 20 3 Overall dimension of plane 177。 5） Add the rubble stone with size 200mm, which accounting for 15%25% of the total quantity. 6） Strengthen the thermal curing to slowly radiate on the surface of foundation. After the concrete finally setting, the curing by ponding shall be provided. 7） Embed the circulating water pipe in foundation to radiate. 8） Be mixed with ice. 9） Take measures to reduce the temperature of soil and gravel. The concrete near the foundation bolt, preembedded parts, prepared hole form and preembedded pipeline shall be pacted by vibrating to avoid impact. It is necessary to check the displacement deviation during construction. In constant temperature, the concrete shall be covered and cured by watering after 12 hours of grouting. The watering times depend on the wet condition of concrete. No less than 7 days of curing period is required. If the concrete is added by the slowly setting addition agent, no less than 14 days of curing period is required. The margin of concrete trial block with the same mixture ratio shall conform to the following requirements: 1） No less than two groups per working shift。 3） Increase the content of coal ash to decrease the cement。 3） Preembedded foundation bolt, prepared hole form, preembedded parts and metal supports. The test report of mixture ratio for foundation concrete shall be provided. The same type and same mark of cement produced by the same factory shall be provided for the same foundation concrete. It is forbidden to add the additive containing chloride to the reinforcement concrete. The operating platform shall be provided during grouting the concrete. It is forbidden to stand on the reinforcement for operation. Before construction of concrete, the material reserve, mixing and conveying capacity shall be planed and the grouting scheme of concrete shall be prepared. If possible, the premixing concrete shall be provided. During the construction of bulk concrete, the temperature differential between inside — 13 — and outside the foundation shall not exceed 25℃ . To protect the concrete from cracking, the following measures can be selected to reduce temperature. 1） Use the cement with low heat of hydration。 3 The galvanized iron wire used for colligating the steel reinforcement shall conform to the following regulations: 1） iron wire with diameter of mm is suitable for colligating the steel reinforcement with diameter of 12 mm. 2） iron wire with diameter of mm is suitable for colligating the steel reinforcement with diameter of 12—25 mm. 3） iron wire with diameter of mm is suitable for colligating the steel reinforcement with diameter of more than 25mm. The minimum length of galvanized iron wire used for colligating the steel reinforcement shall conform to the regulations on the following table — 12 — Table The Minimum Length of Iron Wire used for Colligating Steel Reinforcement（ mm） Diameter of steel bar 6 8 10 12 14 16 18 20 22 25 28 32 6 130 140 150 160 180 190 210 230 250 270 300 320 8 — 150 170 170 180 200 220 250 260 280 300 330 10 — — 180 190 200 220 240 250 260 280 310 340 12 — — — 200 220 230 250 260 270 290 310 340 14 — — — — 230 240 250 270 280 300 320 350 16 — — — — — 250 260 280 300 310 330 360 18 — — — — — — 270 300 310 330 350 370 20 — — — — — — — 310 320 340 360 380 22 — — — — — — — — 340 350 370 390 25 — — — — — — — — — 370 390 410 28 — — — — — — — — — — 400 430 32 — — — — — — — — — — — 450 Concrete Works Before grouting the concrete on foundation, the following items shall be checked and conform to their specifications: 1） Axis, elevation and location。 10 2 Column beam 177。 firstly the column form panel shall be removed, then the beam and platform form panel shall be removed. Steel Reinforcement Works If any phenome