Hebei Mitu Trading Co.,Ltd. was established in 1998, is a large and professional manufacture of high-strength fasteners, and is located in Yongnian County, Handan City, Hebei Province, China. Main product standards: German standard (DIN), American standard (ANSI/ASTM), British standard (BS), China national standard (GB), and other international standards. Product mechanical performance levels cover 4.8, 8.8, 10.9, 12.9, etc.
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DIN 975 Specifications Metric Fastener Data. DIN 975 Threaded Rods are long, solid cylindrical bars that are continuously threaded from end to end with external machine screw threads. Typically 1000 mm (1 meter) long, they are similar to threaded studs but studs are usually less than 200 mm in length.
Rebar couplers are components which connect two reinforcing bars in longitudinal direction, forming a mechanical splice. This is an alternative to lap splices or welded connections. Mechanical splices are used to avoid protruding bars in casting joints, reduce congestion in confined spaces and to save rebar length.
Rebar couplers are components which connect two reinforcing bars in longitudinal direction, forming a mechanical splice. This is an alternative to lap splices or welded connections. Mechanical splices are used to avoid protruding bars in casting joints, reduce congestion in confined spaces and to save rebar length. Rebar couplers are manufactured and attached to the rebar with different technologies and have therefore different characteristics, such as tensile capacity, robustness under real site conditions, the ease of the assembly and control of the correct installation.
Benefits of Rebar Coupler
Reduce congestion of rebars
Congestion happens in the lapping of reinforcement as the steel-to-concrete ratio doubles. It makes placing and compacting concrete challenging, which may significantly affect the structural integrity of the finished structure. Using rebar couplers eliminates this problem.
Save costs
With rebar couplers, construction projects use less steel. Thus, eliminating wastage and unnecessary rebar costs by up to 40%. It is also proven that rebar couplers significantly reduce construction time and reinforcing steel.
Independent of surrounding concrete
The transfer load of lap joints depends heavily on the bonding of the surrounding concrete. Hence, degradation or poor compaction could affect the performance of the splice. When the two reinforcing bars behave as a continuous unit using rebar couplers, concrete is not needed for load transfer, promoting full strength in tension.
No damage to the formwork
Previously, preparing starter bars with them projecting through the formwork generated loads of challenges. Namely, safety hazards of protruding bars, the need for perfect predrilled holes accurately positioned in timber formwork, the time-consuming process of drilling holes in concrete and filling it with resins, and many others. Using rebar couplers to connect starter bars will eliminate all of these challenges.
Are the Rebar Couplers Manufactured Using Computer Numerical Control (CNC) Machines?
The use of a fully automated CNC machine ensures a highly accurate rebar coupler. This not only ensures that the thread is located centrally in the coupler, therefore avoiding unwanted bending moments, but also that well-matched threads were produced consistently when compared to manual tapping, where the accuracy and quality are highly dependable on the operator.
Does the Rebar Coupler Come with a Chamfered Edge?
Chamfered edge helps to cope with axial misalignment, providing a positive alignment locking connection thus providing load path continuity. It is also safer to install a chamfered coupler, especially when hand tightening a parallel threaded rebar coupler during installation.
Tighten the screw of the first bar and twist off the head, insert the other bar into the rebar coupler until it rests against the center stop. If the rebar coupler does not have a center stop, insert the second bar until it butts against the first bar.
Roll Thread Rebar Coupler
In the roll thread rebar couplers, the rebar is threaded with the help of a threading machine. This process helps fit these couplers in reinforcement. And the TMT bar ends are also traded in the machine. After this procedure, the rebar coupler's installation is done for both the ends and the TMT bar like bolton nuts and bolts for the continuous reinforcement.
Cold Forged Rebar Coupler
Similar to the roll thread rebar coupler, these are also threaded with the help of a threading machine. However, in this coupler reinforcement process, the TMT bar ends are forged with the help of a fogging machine, and it is done through the hydraulic pressure machine. After the completion of the forging process, the TMT bar loses a minimal part of the plant and thickness automatically increases then the bar end is threaded with the help of a threading machine and fitted properly within the rebar couplers.
MBT Rebar Coupler
These are designed for the crucial condition of regular reinforcement. In the reinforcement, MBT is used when there are very less lap lengths and it does not much of the bar is left for the continuous reinforcement. It is commonly used within the retro rafting constructions and around 6 to 8 bolts are present in the top one MBT.
Crimping Rebar Coupler
It is considered as the first rebar coupler in the reinforcement of the construction industry and it was introduced in the market after the launch of the threaded rebar coupler. In this rebar type of coupler, there is no thread present and are without the thread. The rebar coupler is directly fitted into the two ends of TMT bars. At the end, the coupler is crimped with the help of a crimping machine.
Material of Rebar Coupler
Commonly used materials include carbon steel, stainless steel, etc. When selecting materials, you need to consider the requirements of the use environment, such as corrosion resistance, high temperature resistance, etc.
Tension And Compression Tests: These tests determine the couplers' failure points. Based on code systems, reinforcing bars need to surpass the strength of the rebar by a set percentage.
Temperature Tests: Temperature tests examine how the bars stand up in extreme weather conditions. Certain splicing materials may hold up better than others in concrete construction.
Slip Tests: Slip tests assess the rebar movement in a coupler.
Cyclical Load Tests: These tests apply stress to determine the strength of the coupler used. The results tell you how soon a type of splice may fail.
Corrosion Tests: Corrosion tests ensure that your bars and coupler systems will withstand the elements for a long time.
How to Choose The Right Rebar Coupler
You must ensure that the rebar coupler which you are going to use is capable of handling better tension strength more effectively. Know about the capacity which it can handle the capacity of your project well and can let you improve the integrity and continuity of your structure. You need to choose the best rebar couplers which can stand for a longer period and can support your structure more effectively. As these are the most important elements in your construction structure, therefore, never compromise on their reliability and durability.
Process of Rebar Coupler
Choose Materials
In order to ensure the quality and performance of the connector, high-quality steel needs to be selected as raw material. Commonly used steel materials include carbon steel, stainless steel, etc. When selecting materials, you need to consider the requirements of the use environment, such as corrosion resistance, high temperature resistance, etc.
Processing
First, the selected steel is cut into blanks of corresponding length according to the design requirements. Then, the blank is shaped by heat treatment or cold working. Specific processing methods include forging, casting, cold heading, etc. These processing methods can be selected according to actual needs to ensure the accuracy and strength of the connector.
Machining The Threads Of The Connector
Threads are an important part of a rebar coupler, providing a secure connection. Thread processing mainly includes turning, tapping and other processes. Through these processes, threads can be formed on both ends or within the connector to facilitate connection with other pipes or equipment.
Surface Treatment
Surface treatment is to improve the corrosion resistance and aesthetics of the connector. Common surface treatment methods include galvanizing, spraying, polishing, etc. Galvanizing can form a zinc layer on the surface of the connector to improve its corrosion resistance; spraying can increase the appearance of the connector; polishing can make the connector surface smoother and reduce friction resistance.
What is the Spacing for Rebar Couplers?
Rebar couplers should be used in staggered manner. Minimum of 600 mm or 2 ft of vertical distance should be maintained. Couplers used alternately such as there should be at least one bar in between two couplers.
What is the Difference Between Type 1 and Type 2 Rebar Couplers?
There are two standard grades of rebar couplers in terms of pull out strength: Type 1 and Type 2. A Type 1 rebar coupler has a pull out strength that measures at 125% the yield strength of the rebar, while a Type 2 rebar coupler has a pull out strength that measures at 160% the yield strength of the rebar.
Where Do You Use a Rebar Coupler?
The primary work of this coupler in reinforcement is to join two TMT bars for continuous reinforcement. The rebar coupler is used in all the construction fields, such as, constructions of buildings, bridges, dams, towers, etc.
Things to Note When Using Rebar Coupler
During the installation process, the instructions for use should be strictly followed to ensure that the rebar coupler is in the correct position and direction. During use, avoid overloading, excessive shearing, and repeated bending to avoid affecting the service life and safety performance of the rebar coupler. After completing the rebar coupler installation, the rebar coupler should be inspected. If any problems are found, they should be adjusted and repaired in time to ensure the firmness and stability of the building structure.
Rebar coupler systems, sometimes also known as mechanical splices, are used as an alternative to traditional lap splices in concrete. They transmit the rebar load directly from one rebar to another without relying on concrete bond, concrete strength, or the condition of the concrete surrounding the rebar and coupler.
What is The Difference Between a Coupler and a Connector?
Connectors are designed to be easily disconnected and reconnected, often without damaging the objects they connect. A coupling, on the other hand, is a mechanical component used to connect two or more shafts or rotating parts, such as the shafts of two motors or the shaft of a motor and a pump.
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FAQ
Q: What is a rebar coupler?
Q: What is the code for rebar coupler?
Q: What is the advantage of rebar coupler?
Q: What is the difference between Type 1 and Type 2 rebar couplers?
Q: What is mechanical rebar coupler?
Q: What is the spacing for rebar couplers?
Q: What is the process of rebar coupler?
Q: Where do you use a rebar coupler?
Q: What is the purpose of a rebar coupler?
Q: What material is used for rebar coupler?
Q: Why is rebar spacing important?
Q: Which is better coupler or lapping?
Q: What is the minimum lap for rebar splices?
Q: How far down should rebar be in concrete?
Q: What is the minimum required overlap on a #4 rebar coupler?
Q: What is the alternative to lapping of steel?
Q: What is the minimum distance between two lapping?
Q: Why is rebar coupler staggered?
Q: How long is a number 8 rebar coupler?
Q: How does a rebar coupler work?
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