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About Bridge Stent Spiral Pipe

Date:2020-01-06View:880Tags:About Bridge Stent Spiral Pipe
ASTM material standards are developed by the American Society for testing and materials. ASTM material standards can include chemical, mechanical, physical, and electrical properties of materials. These standards include not only a description of the test methods to be performed on building materials, but also a description of the dimensions and shapes to be used for these materials. Prior to use in buildings, local laws may require building materials, such as concrete, to meet ASTM standards. It is widely used in ASTM A53 and ASTM A106.



ASME is an American Society of mechanical engineers standard. The ASME material code is based on Specifications issued by ASTM, AWS and other recognized national and international standards. ASME standards are required by law when building infrastructure such as bridges, power plant pipelines and boilers. It is widely used in ASME B16.5.


ASTM is responsible for developing and re establishing standards for all old and new materials. Because it's about testing and materials.


ASME will selectively absorb and filter these standards for the relevant work used, and modify them for improvement.

ASTM is an American material standard, similar to gb713 in China

ASME is a design code, but ASME is a complete system. With the development of the industry, the project puts forward higher requirements for the use of spiral steel pipes for bridge supports. The reason why there are thick wall spiral pipes is that some medium pressures that need to be transported cannot be borne by ordinary spiral pipes. If straight seam pipes or seamless steel pipes are used, then It will greatly increase the cost of the project. If it is a dangerous medium, it is inevitable for us to increase the cost. Therefore, the selection of pipeline is determined according to the medium to be transported and the pressure of the medium. The strength of spiral steel pipe used for bridge support is usually higher than that of large diameter straight seam steel pipe. The pipe with larger diameter can be produced with narrow blank, while the pipe with the same diameter can be produced with casting blank. Billets of the same width. However, compared with the straight pipe of the same length, the weld length increases by 40-100%, and the productivity is low. The first three batches of steel shall be strictly inspected first. The mechanical properties, chemical composition, fusion state, steel surface quality and non-destructive testing of welds shall be inspected. The qualified pipes can be put into production formally through maintenance. The production process of thick wall spiral steel pipe is simple, high efficiency, low cost and rapid development. There should be a certain channel between the chimney of thick wall spiral steel pipe and the chimney. The width of the inspection channel is usually about 0.5m. The width of the passage depends on the size of the material and transport machinery. Generally, the stacking height of spiral steel pipe is 1.5-2m, the manual operation is not more than 1.2m, the mechanical operation is not more than 1.5m, and the stacking width is not more than 10m for the bridge with spiral pipe.


As a bridge type steel pipe, the best welding method should be found to improve the production efficiency of spiral steel pipe. Let's see what is the best way to weld the spiral pipe. The cleaning of welded steel pipe should first clean the oil, paint, water, rust, etc. in the mouth, then according to the wall thickness of the groove, the thickness of the opening is larger, and the thin opening is smaller (angle grinder), and then the correct product clearance, generally 1 to 1.5 times the diameter of the electrode or wire, if you inadvertently open a large bevel, you can appropriately leave a small one. Spot welding should be at least three o'clock, generally four points are easier to do. The welding time of steel pipe shall be half of the welding time, and the starting point shall be at least one centimeter higher than the lowest point, so it is better to leave the opposite joint. If the pipe has a wall thickness, the first weld shall be layered at least two times before the entire second weld. Spiral steel pipe bridge Packaging refers to the protection layer of the outer layer for the convenience of transportation or for the protection of spiral steel pipe. The general spiral pipe packaging is mainly the export spiral pipe, because the export of spiral pipe is mainly by sea. In order to facilitate the general loading and unloading packaging, spiral steel pipe packaging is mainly divided into the following forms: 1. Binding packaging, i.e. binding, such as 219 spiral steel pipe, 7 bundles, 273 spiral steel pipe 7 Bundles. Each bundle has a lifting strap at both ends for easy lifting. 2. The box type packaging is to use angle steel, square tube, welded steel groove to form a box, with the upper opening, and directly load and unload the same size as the container.


Spiral steel pipe with support material, including coil, wire, flux. Strict physical and chemical tests are required before input. Single wire or double wire submerged arc welding shall be adopted for butt joint of head and tail of steel pipe, and automatic submerged arc welding shall be adopted for rolled steel pipe. Before forming, the strip steel shall be leveled, trimmed, planed, cleaned and transported to processing and bending. Use the electric contact pressure gauge to control the conveyor pressure on both sides of the pressure tank to ensure the smooth delivery of the strip. External control or internal roll forming. The gap control device is used to ensure that the weld meets the welding requirements, and the pipe diameter and stagger amount have been strictly controlled. Internal welding and external welding are carried out by single wire or double wire submerged arc welding with Lincoln welder to obtain stable welding specifications. Ultrasonic on-line automatic continuous damage tester is used for continuous inspection of welds to ensure 100% coverage of non-destructive testing of spiral welds