Preparation technology of spheroidal graphite cast iron screw pile and spheroidal graphite cast iron screw pile prepared by adopting preparation technology
A ductile iron and preparation process technology, applied in the direction of improving process efficiency, sheet pile wall, foundation structure engineering, etc., can solve the problems of poor corrosion resistance, corrosion aging, shortening the service life of steel piles, etc. Long service life and wide application fields
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Embodiment 1
[0061] A preparation process for a nodular cast iron screw pile has the following steps:
[0062] S1. Preparation before pile casting: ingredients, melting, modulation, and spheroidization of ingredients:
[0063] S11. The ingredients include the following materials in parts by mass:
[0064] Foundry pig iron: 90 parts;
[0065] Scrap steel: 10 parts;
[0066] S12. The melting of the ingredients is to weigh the raw materials according to the mass parts of each raw material in step S11, and melt them;
[0067] S13. The modulation process is to add alloy elements for adjusting the composition of the molten iron: C, Si, Mn, S to the molten iron obtained in step S12. The components of the molten iron after the modulation process are C: 3.6%, Si: 2.5% %, Mn≤0.5%, S≤0.02%, the balance is Fe and unavoidable trace elements;
[0068] S14. The spheroidizing treatment is to add a spheroidizing agent to the molten iron obtained in step S13 by a flushing method. The spheroidizing agent...
Embodiment 2
[0074] A factory building is built using ductile iron straight screw piles as the foundation.
[0075] Such as Figure 1-4 As shown, a nodular cast iron screw pile prepared by the preparation process of a nodular cast iron screw pile described in Example 1, the nodular cast iron screw pile includes a guide tube, and the guide tube is a straight guide tube 1, the The lower end of the straight guide pipe 1 has a slope-shaped apex 1.1, the angle between the plane of the slope-type apex 1.1 and the horizontal plane is 45°, the upper end of the straight guide pipe 1 has a socket 1.2, and the straight guide pipe 1 has a socket 1.2. The socket 1.2 of the pipe 1 is provided with 4 bolt holes, and along the axis of the straight guide pipe 1, two spirally ascending rotors 2 are sequentially arranged, the number of turns of the rotor 2 is equal to 1, and the rotor 2 The height difference between the starting end 2.2 and the terminal end 2.1 is 150mm.
[0076] The straight guide pipe 1 ...
Embodiment 3
[0085] Ductile iron conical screw piles are used as pipeline support for foundation construction.
[0086] Such as Figure 5-8 As shown, a nodular cast iron screw pile prepared by the preparation process of a nodular cast iron screw pile described in Example 1, the nodular cast iron screw pile includes a guide tube, and the guide tube is an inverted tapered guide tube 4, The lower end of the inverted cone-shaped guide tube 4 has a slope-shaped apex 4.1, the angle between the plane of the slope-shaped apex 4.1 and the horizontal plane is 45°, along the axis of the inverted-cone-shaped guide tube 4, two The rotor 5 is spirally rising, the number of turns of the rotor 5 is equal to 1, and the distance between the starting end 5.2 of the rotor 5 and the terminal end 5.1 of the rotor 5 is 150mm.
[0087] The inverted tapered guide pipe 4 is connected with the rotor 5 by welding.
[0088] The upper end of the inverted tapered guide pipe 4 has a socket 4.2, and the socket 4.2 of th...
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