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How to distinguish plain round steel bar and ribbed steel bar?

The difference between plain round steel bar and ribbed steel bar is mainly whether there is rib on the surface. This rib can be longitudinal force or transverse rib. If it is a steel bar with two longitudinal forces or a transverse rib evenly distributed along the length. However, for small-scale steel, cold-rolled ribbed steel bars fall into this category and are mainly used in the skeleton of reinforced concrete building components. If it is a steel bar with a certain mechanical strength or bending deformation, if the process welding performance is relatively strong, it is mainly used for domestic cold-rolled ribbed steel bars. The transverse ribs are mostly spiral, herringbone, and crescent-shaped steel bars. . From the perspective of specifications and appearance, the specifications are standard grades, the diameter of steel bars is expressed in nominal terms, and in terms of quality, it is expressed in nominal weight. If the specified length and the corresponding index tolerance come Said that the difference is also different, most of them are measured by the national standard, and generally consist of cold-rolled ribbed steel bars with different diameters of 6, 8, 10, and 12 mm. From the point of view of the quality of the surface, it can be seen that the end of the steel bar is cut very straight, and there will be no cracks on the surface, or there will be scars on the spot, and there will be no harmful material defects. In addition to the differences in specifications and surface quality, there are certain differences in the deviation of external dimensions, etc., which must be within the allowable value of the difference.

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my country's energy-saving and environmental protection construction machinery industry will face important opportunities

It is understood that my country's energy efficiency is only 26.9% of that of the United States and 11.5% of Japan. It is one of the countries with the most serious waste of natural resources in the world, and construction machinery internal combustion engine products are the second largest industry in addition to the automobile industry. Due to Its emission density is high, and its emission index is inferior to that of automobiles, so the pollution to the environment is more serious. Qi Jun, president of the China Construction Machinery Industry Association, said that my country is "the largest construction site in the world", and engineering construction drives the rapid development of the construction machinery industry. Due to the relatively loose emission requirements for construction machinery products, the market is flooded with high-emission products, which have become a heavy burden on my country's current environment. Therefore, the industry calls on the domestic construction machinery industry to take the road of energy conservation and environmental protection. At the same time, some people point out that , my country's energy-saving and environmental protection construction machinery industry will face important opportunities. According to the latest analysis report released by the China Environmental Protection Machinery Industry Association, a series of policies to support the development of the environmental protection industry will enter the implementation stage throughout 2013, and the strategic opportunity period for the energy-saving and environmental protection construction machinery industry will be highlighted. It is expected that the growth rate of the entire industry will exceed 25%. The "Twelfth Five-Year Plan for Industrial Energy Conservation" shows the overall goal of industrial energy conservation: by 2015, the value-added energy consumption of industries above designated size will drop by about 21% compared to 2010. The strict requirements put forward by the state make construction machinery enterprises have to put energy conservation and environmental protection in an important position in their development strategies. In addition, at the moment, new urbanization construction has become a source of economic growth for a long period of time, which will have a very positive effect on boosting the energy-saving and environmental protection construction machinery market. Statistics show that the total investment in environmental protection in 2012 was more than 600 billion yuan, a year-on-year increase of 25%, which was the year with the highest investment growth rate in the five-year plan. In 2012, under the dual effects of national policy support and market demand, the economic operation of the environmental protection equipment manufacturing industry was in good shape, and continued to maintain a stable growth rate and profit margin. In 2012, the total industrial production value and industrial sales output value of the 1063 environmental protection equipment manufacturing enterprises (including the manufacturing of special equipment for environmental protection and the manufacturing of special environmental monitoring instruments) that entered the statistical caliber were 191.379 billion yuan and 187.947 billion yuan respectively. An increase of 19.46%, industrial sales output value increased by 19.58%. Analysts pointed out that the economic operation of the industry in recent years has highlighted the strong policy orientation of the environmental protection equipment manufacturing industry, which is an industry characteristic with a strong ability to resist risks. Some experts predict that in order to complete the task of energy conservation and emission reduction, the construction machinery industry will become an important sector in my country's promotion of energy conservation and emission reduction in the next 5 to 10 years, and its market potential cannot be underestimated.

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The location of the mechanical connection

Rebar joints should be set up with a small force of staff. The same longitudinal tendon should not be established by two or more joint forces. The connecting end bar is bent by not less than 10 times the bar diameter from the starting point.

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Preparation and adjustment before thread rolling machine processing

Thread rolling machine processing steel according to the specifications, adjust the travel location switch pressure block to ensure that the effective length of the thread is rolled to the required value, (4) Clamping of the workpiece The thread rolling machine will install the card processing, the steel is the center of the jaw, the extended length should be the same as the initial position of the first peeling piece, the end is adjusted to roll, and then flip the handle to clamp.

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Introduction of Rebar Mechanical Connection Technology

Reinforcement mechanical connection technology is a new type of rebar connection process, known as the "third-generation rebar joint" after binding and electric welding, with joint strength higher than the base metal of rebar, speed 5 times faster than electric welding, no pollution, and saving steel 20% and other advantages. At present, the commonly used types of steel mechanical connection joints on the market are as follows:

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Construction plan for mechanical connection of steel bars

When connecting, it is necessary to ensure that the joints and sleeves are clean and free from cement slurry and other debris.

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