Key points of construction of steel sheet pile cofferdam

The prison can be subsided in place, but also in the base of the pile will be the whole corner of the basin, plug the positioning pile and positioning pile after the construction of a stable platform. The first pile pile operation, and then siege inserted steel sheet pile.

In the cofferdam suction mud until the back cover before the process should check the cofferdam outside the river bed erosion, if necessary, should be rubbing stone protection.

In the cofferdam suction mud to the design of the back cover after the bottom elevation, the substrate should be flat, remove the floating mud, pouring underwater concrete at the back cover. To be required after the strength of the pumping, pouring cap.

Differences Between Steel Pipe & Black Iron Pipe

The average homeowner is unaware of how much piping leads into and out of their home. There are the ever-present pipes underneath the sink or ones leading to the hot water heater. However, an in-depth look behind the walls and underneath the ground reveals that there are enough pipes to wrap around the house several times. There are HPVC, PVC, black iron and steel pipes leading everywhere.

Steel Pipe

  • A steel pipe is made from steel and is used in things such as fences, oil lines, water treatment facilities and bridges. It is very durable and long lasting. Inside the home, it is usually the pipe system that connects the lines from the local water supply or septic tank to the house. Houses near bodies of water will use steel because it corrodes less easily.

Black Iron Pipe

  • Most homes built before the 1960s have black iron pipe for things such as water and gas lines. It is a form of steel pipe, but made from more malleable products. Most modern homes use PVC pipe, which is cheaper and easier to work with. However, some re-modelers are going back to to black iron pipes because it is very durable for gas. It is rarely, if ever, used anymore to transport water into a home because it corrodes easily.

Working Differences

  • Construction is the main difference between the two products. Black iron pipes will have seams that allow the user to connect them easily to other pieces of pipe using connector valves. Steel pipe is more often used in industrial applications and it needs to be welded. Even experienced craftsmen have trouble working with both kinds of metal, so do-it-yourselfers shouldn’t get discouraged if they make some early mistakes.


  • Steel pipe will have a very fine feel to it and almost be cool to the touch. It won’t scratch as easily as black iron pipe, but that doesn’t meant it can’t be damaged by a wrench or hammer while working around it. Black iron pipe is course and grainy and will feel the same at room temperature. Black iron pipe will also flake if it is handled a lot. However, both can be heated very easily and will burn the user’s hand.


  • The main problem with black iron pipe–especially in the home–is leakage at connector spots. It requires a lot of work to fix these leaks, which is why many people no longer use black iron pipes. Steel pipes do not have that problem because it is most often welded. However, it is more expensive than black iron pipes or PVC.


  • Steel pipe will usually cost about 20 percent more than black iron pipe, but it does a better job of saving resources in the long run by being more energy efficient. Its durability and cost are part of the reasons that use of steel pipes for large industrial jobs has grown in the United States. However, black iron pipe is more widely available than steel, which also makes it more convenient.

(This article comes from eHow editor released)

Chinese Academy of Water Sciences Wang Hao academician to sea salt guide Huixiang steel sheet pile to promote the use of work

Recently, the Chinese Academy of Water Sciences Wang Hao academician of the Ministry of Water Resources Science and Technology Promotion Center, Zhejiang Water Resources Promotion Center, Zhejiang Water Resources Department flood control and materials procurement center and other relevant person in charge to Zhejiang Haiyan, to guide the high-strength steel sheet pile Promote the use of work.

Huixiang high-strength steel sheet pile is Haiyan Huixiang New Building Materials Technology Co., Ltd. and the Ministry of Water Resources, Ministry of Transport, National Energy Bureau and State Key Laboratory of Polymer Materials Engineering, Shanghai Survey and Design Institute Co., Ltd. and Nanjing Institute of Water Resources , To explore the study of China’s water conservancy construction of new technologies, new technology, new materials. November 2015, high-strength steel sheet pile access to the Ministry of Water Resources, “2016 annual water advanced technology extension certificate”, at the same time, plastic sheet pile products have been included in the national flood protection products directory.

Wang Hao academician and other experts to lead the salt, inspection and guidance of the company developed by the Department of mobile steel sheet pile flood control wall and the current rescue-type steel sheet pile flood control wall technology and installation applications. The steel plate pile has the functions of retaining soil, retaining water and anti-penetration. It is mainly used in flood control engineering and flood control emergency rescue. At the same time, it can solve the problem of small construction area, Among them, the mobile flood control wall, flood control height of up to 2 meters, the product made of polymer materials, lightweight materials, installation and storage is simple, it is understood that the cost is only one of the traditional “flood artifacts” one-fifth. The main application of the flood control emergency rescue, construction is simple, just the plate and steel pipe into the soil, to complete the installation of one meter piles, before and after less than 2 minutes, you can build a flood control flood wall. The two technologies have been fully affirmed by the Academician Wang Hao, he said: plastic sheet pile flood control wall all the small and lightweight components, easy to single handling; simple connection, easy to install quickly; good sealing, waterproof effect; For the load-bearing body, retaining height and other advantages, it is worth promoting the application.

Series of wall thicknesses of steel tubes

Series of wall thicknesses have its origin in the Imperial Unit system (inch), which for expression of sizes uses fractions. Wall thicknesses in PIPE are created by “Schedule” (40, 60, 80, 120 ….), connected in some dimensions to the weight class (STD, XS, XXS). These values, converted to millimeters form a part of series of wall thicknesses. (Note: size – the value of Schedule for example 40 is not constant, but depends on the outside diameter of tube).

For the Tube the wall thickness values are derived from the “scales” of BWG, SWG eventually others. After conversion into mm these values are another part of series of wall thicknesses for steel tubes. For the precision steel tubes used in Europe and in countries using the SI system the dimensional line is created with rounded off dimensions of the outside diameters and wall thicknesses. Tolerances for outside diameter, inside diameter and wall thickness are valid for two ordered values only. Tolerance of third dimension is possible to agree at precision tubes only.

(This article comes from editor released)

Dimensional series of steel tubes

Dimensions of the individual tubes are not randomly produced, but are arranged according to dimensional series based on certain systems. Tube dimensions are in mm. In the USA and some other countries dimensions are given in inches (German “Zoll”). In this case, the tubes are divided into two groups so called TUBE. These tubes are used for mechanical usage and energy facilities and in inches are given dimensions of the outside diameter. PIPE are tubes for pipelines for different types of media. The PIPE sizes are given as the nominal tube size. For sizes up to 12 inches the approximate size (clearance) of the inside pipe diameter is given. From the PIPE dimensions after their conversion to millimeters, is created the first preferred line of the outer diameter of steel tube (1st line is in EN 10220, DIN 2448, etc.). This does not mean that the tube dimensions in the 2nd and 3rd series are not used. Dimensions in series 2 and 3 (for use in Europe are modified by the rounded off dimensions in mm) are standards for TUBE used in the construction of energy facilities and for tubes for mechanical application.

(This article comes from editor released)