sh3510-2000石油化工设备混凝土基础工程施工及验收规范英文版

sh3510-2000石油化工设备混凝土基础工程施工及验收规范英文版内容摘要：

turned to installation, its axis, elevation and value of elevation shall be marked. — 9 — 3． Form panel, steel reinforcement and concrete works Formworks The installation scheme, as well as type, size and quantity of form panel shall be selected according to the construction drawing. The form panel shall be cleared and repaired before it is used. During installing the form panel, the joints shall be pactive. The contacting surface between the form panel and concrete should be coated with insulating agent before they are used. The partial form panel of foundation reached above of ground shall be coated with the insulating agent that is no pollution to concrete surface. During installation of the form panel, the foundation axis and outline shall be prepared on the concrete mattress or base plate. During install the column form panel on the frame foundation, the clean out shall be prepared at the bottom of the column form panel. The operating hole shall be prepared in each 2m of shaft of column form panel. During the construction of steel formwork, a form panel can be removed as a clean out or an operating hole where it is necessary. Where the section of structure is small, the steel reinforcement is dense, or the operation is difficult, the through operating hole shall be set, which the form panel shall be sealed while grouting concrete. The counterdraw bolt of M12 shall be set on both sides of form panel of walltype foundation. The space of counterdraw bolt can be laid by calculation, or according to the following table . Table Space of Counterdraw bolt Layout Side pressure of concrete（ kPa） Space of counterdraw bolt (mm) ≤ 20 ≤ 40 ≤ 60 If there are trenches for pipeline in the equipment foundation, during the installation of form panel of foundation, the precast concrete trench can be installed on the shaped steel supports and can be casted in place with the foundation concrete. The form panel and supports can be removed according to the following regulations, if — 10 — it is not required in design. 1） When removing the form panel, the strength of foundation concrete shall not be less than the parameters stipulated in the following table . Table Strength of Concrete of Foundation during Removing the Form Panel No. Type of structure Span of structure (m) Percentage of designed strength (%) 1 Panel (bottom form) ≤ 2 50 2~8 75 2 Beam (bottom form) ≤ 4 75 4 100 3 Cantilever beam (bottom form) ≤ 2 75 2 100 4 Block foundation — 40 2） The procedures of removing form panes shall be in reverse to the order of its installation. In general, firstly the side form panel shall be removed, then the bottom form panel shall be removed。 firstly the column form panel shall be removed, then the beam and platform form panel shall be removed. Steel Reinforcement Works If any phenomena of brittle rupturing, poor welding or abnormal mechanical performance occur during the processing of steel bar, the chemical analysis or special examination shall be adopted. If the grade and diameter of steel bar that are different from their design, their replacement shall be approved by the design unit, if necessary. The joints of steel bar shall be welded. The method of buttwelding will be provided for the steel bar with more than 22mm of diameter. The welding of steel bar shall conform to the regulations on the JGJ18 “Rules of Steel Bar Welding and Acceptance ”. Where the power equipment foundation may be heavily shocked, the method of welding joints shall not be adopted to connect the steel bar. Before installation of steel reinforcement, the batching list and plate of reinforcement shall be checked according to the construction drawings. As for the frame foundation, if the preembedded bolt is contacted with the steel bar at the connecting place of beam and column, it is necessary to ensure the installation of bolt in — 11 — correct position, or ask for the design unit. As for the laminated place of the hook and hooped reinforcement of beam or column, the hook and hooped reinforcement shall be staggered along the forced direction of reinforcement. In the laminated place of the hook and hooped reinforcement of beam, the hook and hooped reinforcement shall be alternatively placed between the two erected steel bars. In the laminated place of the hook and hooped reinforcement of column, the hook and hooped reinforcement shall be alternatively placed at four corners of main reinforcement. The hooped reinforcement of beam or column shall be perpendicular to the main reinforcement. The hook and hooped reinforcement shall be made with angle of 135176。 . Where there are two meshes of up and down in the foundation reinforcement, the steel bar and shaped steel can be made into the supports to locate the up mesh of steel reinforcement. The thickness of concrete cover for steel bar shall conform to the regulation on the GB50204 “Specification for the Construction and Acceptance of Concrete Structure Works”. The tolerance deviation for the concrete cover shall conform to the table . Table Tolerance deviation for the thickness of steel reinforcement cover (mm) No. Items Tolerance deviation 1 Foundation 177。 10 2 Column beam 177。 5 3 Panel wall 177。 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。