General Requirements Of Steel Pole Structure And Design Of Electric Steel Pole
General requirements for steel pole structure:
The steel pole is generally made of Q235 and 16Mn, etc., and its section shapes are mostly round and 12-sided, and the pole body is mostly conical. In general, the slope of the pole is 1/75 ~ 1/70, and the 30° Angle is 1/65 and the 60° Angle is 1/45 and the 90° Angle is 1/35.The tip diameter of the steel pole is generally 200 ~ 260mm, which can be determined according to the design calculation, and most commonly used steel pole tip diameter is 230mm.
There are two kinds of joint modes of multi-section bar, flange connection and socket connection, which can be selected according to the actual situation.For deflection, the straight steel bar should not be more than 5 percent, the Angle bar should not be more than 2 percent.Steel bar foundation is mostly large stepped reinforced concrete foundation, and other foundation forms such as cast-in-place pile foundation can also be used in special areas.
Electrical steel pole design: now countries are not unified standards and design about steel bar method, and the steel bar manufacturer has some molding experience and a large number of experimental data, so the steel pole body and foundation design are usually by design personnel to provide the corresponding technical data, and the steel bar manufacturer is responsible for the design, the design is completed by the designer is responsible for checking again.
1. The technical data to be provided by the designer to the pole factory mainly include the following aspects:
1) basic information of the line: including voltage grade of the line, line return number, line arrangement mode, bar type, Angle degree, call height, type of conductor (lightning conductor), safety factor, horizontal and vertical distance, regular distance and meteorological conditions of the area through which the line passes, the corresponding head design size should be provided.
2) the number of steel pole: the specific number of steel pole of various types, Angle degrees and calling heights should be provided in detail.3) local soil conditions: including soil type, freezing depth, soil calculation Angle, soil bulk density, ground endurance, groundwater level, etc., for the purpose of basic design.
