Calculating the stakeout and production process of large-scale tower torsion section joints (Anhui Sending and Transforming Engineering Co., Ltd., Hefei, 230) 22) Calculating the spatial structure of the torsion-cross section connecting piece 500kV high-voltage transmission line corner tension tower, its torsional section The connecting member not only has a large material size, but also has strict requirements on the processing dimensional accuracy. The design drawings are expressly required and all dimensions must be determined by a 1:1 magnification. At present, most domestic manufacturers use flat lofting. The transmission tower is a space structure, and the size obtained by the plane enlargement sample is often an approximation. As a connection piece, the manufacturing size is large, and the error is large, so that the processed connector is not installed after being transported to the construction site. If forced assembly is used, the joint will be severely deformed, resulting in a significant decrease in the torsional performance of the tower during operation.
Then, how to improve the processing precision of the tower torsion section joints, first of all, to use the calculation of the stakeout to improve the accuracy of the stakeout; on this basis, the part of the fiery of the fiery, the cold-formed cold-formed, can not be save trouble. The following focuses on the calculation of the stakeout.
1 Calculate the stakeout 1. Calculate the length of the main line of the tower. Calculate the torsion section of the tower. As shown in the figure, the tower body is positive and the side is a trapezoidal shape. The guide line is given by the design. The top view is the torsion section of the tower, which is generally square. The guide line length a of the main profile of the frame can be calculated by the formula (1): * the angle between the main material guide line and the trapezoidal side perpendicular line; the inclination angle of the a side plane of the tower; the length of the horizontal guide line on the A1*- side.
1.2 Turning the corner of the corner to calculate the turning board, the original design is a flat board, with a gap installed, the bolts are not tight. In order to make the mounting surface close and seamless, the machining process of the turning plate should be changed, and the bending angle T is calculated first, as shown.
(2) The formula is the angle T. When the cross section is a square section, that is, the inclination angles of the two trapezoidal sides are equal (a=a), the corner angle of the corner plate can be expressed by the following formula: If the calculation angle is 169.16*, the machining bending is correct. The contact surface should be seamless after installation. The tightening bolts can ensure the bending resistance of the cross section of the corner of the turning plate.
2 Conclusion Using the calculation lofting method, not only the easy operation of the enlarged structure of the tower space structure 1 is avoided, but also the accuracy of the lofting is improved, and the overall rigidity of the tower after installation is ensured.
(Editor: Li Liancheng) (Continued from page 30) The first phase of the Tuoketuo Power Plant is a 2X 600MW unit with a unit water supply system. Each unit is equipped with a 6500m2 natural ventilation counterflow cooling tower. The hydraulic calculation and construction drawing design were carried out for the different types of main equipment, materials and civil engineering quantities of the water distribution type, and the investment difference and water distribution and siphon type water distribution. Under the same operating conditions, the comparison of the main equipment, materials and civil engineering quantities of the two water distribution types and their investment differences are shown in Table 1. See: Siphonic shaft water distribution can save water compared to the sleeve type shaft. The investment is about 370,000 yuan.
Siphon type shaft distribution type, after the first phase of Shandong Laicheng Power Plant, the first phase of Hebei Qiufeng Power Plant, the third phase of Huaneng Dezhou Power Plant (2X 660MW unit with 2 9 000m2 natural ventilation cooling tower) and the first phase of Shandong Liaocheng Power Plant The 4th physical model test of the project (2X600MW unit with 2 8500m2 natural ventilation cooling towers) and the actual operation of Laicheng Power Plant and Qifeng Power Plant prove that the technology is completely feasible and can meet the design requirements. The application is on the industrial tower. successful. The technical and economic ratios of the above two types of water distribution types are combined: (1) The investment cost difference in the table is the investment cost reduction of the siphon type shaft distribution type, and the siphon type shaft water distribution technology is more reasonable and advanced, and the economical cylinder type The investment cost of the shaft type water distribution type is “+, saving investment, so the siphon type shaft water distribution is worthy of extensive push. (2) The investment cost of the gate well small room includes civil construction fee, lifting equipment, power distribution and control. Wide distribution of water.
Facilities, etc. (Responsible editor: Xing Shuping) Project sleeve type shaft water distribution siphon type shaft water distribution investment difference / million yuan valve DN26 (1) electric butterfly valve 1 DN2000 electric butterfly valve 1 DN150 solenoid valve 1 (siphon failure valve) expansion joint DN26 (1) expansion joint 2 DN2000 Expansion joint 2 no inlet pipe or D2640X 10 welded steel pipe 50m pressure inlet ditch D2040X10 welded steel pipe 50m 3X3m reinforced concrete pressure ditch 50m water distribution shaft outside shaft: 4.6X4.6m reinforced concrete shaft, height 15. 5m inner shaft: DN2600 steel sleeve Pipe 5.6X5.6m reinforced concrete shaft, height 17.5m distribution tank 2 double-deck main sink 2 single-layer main sink 4 double-deck main sink gate well small siphon cover no 4
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