Unisite Group Ltd.
In recent years, offshore deepwater Wharf Engineering in domestic coastal have also been large-scale construction, and as a deep-water wharf main bearing capacity of pile foundation, the widespread adoption of large diameter spiral Welded Steel Pipe pile; in addition, bridges, roads, and other high-rise buildings need pile pipe.
Photo of our Piling Pipe:
General symbol marking
Nominal diameter of D: Steel Pipe, mm
Nominal wall thickness of T: steel pipe, mm;
M: steel pipe line quality, kg/m
Nominal outside diameter editing
219-3620mm, Zhengzhou Zhongyuan steel pipe company's production of spiral steel pipe diameter up to 3620mm;
Usual length editor
8.0---12m, according to the demand, the supply and demand sides agreed to supply the length beyond the usual length range.
Weight calculation editor
Generally calculated according to the weight of theory, but also the actual measurement of the two sides to negotiate;
Spiral steel pipe is a strip coil as raw material, often warm extrusion molding, automatic double wire double buried arc welding process of welding and the spiral seam pipe.
(1) raw material that is strip coil, welding wire, flux. Have to go through strict physical and chemical tests before they are put into the investment.
(2) strip head and tail docking, using single or double wire submerged arc welding, the steel tube rolled by automatic submerged arc welding welding.
(3) before molding, the strip passes through the leveling, trimming, planing, surface cleaning and conveying, and bending and handling. (4) using the electric contact pressure gauge to control the pressure of the cylinder on both sides of the conveyor, to ensure the smooth delivery of the strip.
(5) the external control or internal control roll forming.
(6) using the welding gap control device to ensure that the weld gap to meet the requirements of welding, pipe diameter, the wrong side of the amount and the weld gap are strictly controlled.
(7) welding and welding with the Lincoln Electric welding machine for single or double wire submerged arc welding, so as to obtain the stable welding specification.
(8) the welding seam after welding is through the online continuous ultrasonic automatic inspection, to ensure that 100% of the spiral weld nondestructive testing coverage rate. If there are defects, automatic alarm and spraying marks, the production workers at any time to adjust the process parameters, timely elimination of defects.
(9) the air plasma cutting machine to cut a single pipe.
(10) into a single tube, each batch of steel tube head to strict inspection system first, check the weld mechanical properties, chemical composition, blending, surface quality of steel pipe and after nondestructive inspection, to ensure that the pipe manufacturing technology qualified, can be formally put into production.
(11) in the weld on the site of continuous acoustic inspection marks, after manual ultrasound and X ray review, if there are defects, after repair, once again after the non destructive testing, until the defects have been eliminated.
(12) strip butt weld and intersecting and spiral seam D connector tube, all through X ray TV or film examination.
(13) each pipe is tested by hydrostatic pressure, and the pressure is sealed by radial seal. The test pressure and time are strictly controlled by the steel pipe water pressure computer testing device. Automatic print record of test parameters.
(14) the pipe end machining, the end verticality, accurate control of slope angle and blunt edge.
Material General requirements
Q235 or Q345. Can also be customized according to the needs of users;
Appearance quality editor
The surface of the steel pipe weld shall not have cracks, broken arc, arc pits and holes and other defects, there are defects in the welding seam to allow repair welding, defect repair or repair. The steel pipe is allowed to have the steel strip butt weld, and the steel pipe is welded with two pipe sections, and the butt welding can be carried out by submerged arc welding or manual welding process.