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Performance Requirements of Grouting Rebar Coupler

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Performance requirements of   grouting rebar coupler   are as follows: 1. Vertical rebar connections at the joints of prefabricated columns and prefabricated shear walls. Semi-grouting rebar coupler or fully grouted rebar coupler can be used. 2. Vertical rebar connections at the joints after pouring the lower part of the prefabricated overlay beam. Fully grouted rebar coupler should be used. Since the rebar couplers of prefabricated components must be arranged at the same section, it is clearly stipulated in the “Technical Specification for Assembled Concrete Structures” JGJ1-2014 that the longitudinal rebar connections using sleeve grouting should meet the performance requirements of Grade I joints in the current national industry standard “Technical Specification for Mechanical Connections of Reinforcement Bars” JGJ107. Whether the joints meet the performance requirements of Grade I joints is determined by the joint type test specified in JGJ107. The content includes three tests: uni
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The Importance of Mechanical Connection in Structural Stability

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In the field of construction and engineering, ensuring structural stability is of paramount importance. One crucial aspect of achieving this is through the implementation of reliable and efficient   mechanical connections . In this blog post, we will explore the significance of mechanical connection, specifically focusing on the application of mechanical couplers. What is a Mechanical Connection? A mechanical connection refers to the joining of two or more structural elements using mechanical means. This method significantly enhances the load-bearing capacity and overall stability of the structure. A well-designed mechanical connection ensures a secure and rigid coupling, reducing the risk of structural failure. The Role of Mechanical Couplers: Mechanical couplers are an essential component of mechanical connections. These devices are specifically engineered to provide a strong and durable joint between reinforcing bars or steel components. By using mechanical couplers, the need for ti
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Installation of Steel Reinforcement Coupling Sleeves and Washers

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In China, the technology of steel frame structure   coupling sleeves   has made rapid progress through the introduction of professional techniques and the diligent efforts of research institutions’ experts. The development of this technology has gone through several stages, such as hot forging of the sleeve specifications, tapered external threads, upsetting and extrusion forming. With the continuous improvement of the technology, the cost of sleeves also been reduced. Following we will discuss how to install steel reinforcement coupling sleeves and the key points to note. Installation of steel reinforcement coupling sleeves and washers: 1. According to the provisions of the seismic design level, coupling sleeves washer should avoid installing the coupling heads in the end regions of the structure and the regions with increased reinforcement density at column ends. If it is necessary to install in locations with high internal stress, the percentage of Level 3 coupling heads within the
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Characteristics of Upsetting Forged Rebar Coupler

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Characteristics of   upsetting forged rebar coupler : 1. It has a strong connection with the rebar, meeting the highest grade (Grade I) requirements of the current industry standard “Technical Specification for Mechanical Connection of Reinforcing Bars” (JGJ 107-2016). 2. Fast construction speed, convenient inspection, reliable quality, and no protentional quality problems in engineering. 3. It not require to electricity during connection, and won't affected by weather conditions, and can be operated in wind, snow, rain, underwater, and flammable gas. 4. Simple operation, both rebar upsetting and threading equipment are easy and convenient to operate. Workers can master and produce qualified joints with short-term training. 5. Rebar threading processing can be carried out on-site or in precast factories, without any pollution to the site. 6. Lower requirements for rebar, joints that meet Grade I performance requirements can be processed for rebar with poor welding performance or la
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How to Make the Template for Rebar Coupler Connection

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How to make the template for   rebar coupler   connection? Procedure standard: 1. Rebar cutting should be done with a non-toothed saw for a straight and even end section. 2. The rebar coupler should be qualified, with well-shaped threads and no defects such as broken or bald threads. After the thread processing is completed, fitted with a protective cover. 3. The coupler be installed by a torque wrench to ensure the tightening torque value meets the specifications. 4. Each connection should be inspected individually and marked with paint if it passes the inspection. Quality standard: 1. The end of the rebar should be perpendicular to the axis and should not have a horseshoe or curved shape. 2. The tightening torque value of the torque wrench should meet the specifications or design requirements, with an accuracy of ±15% for the torque wrench. 3. After the connection, there should not be more than one full thread exposed on each end. 4. The ribs of two interconnected rebars should be in
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Weldable Rebar Coupler and Connection Characteristics

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Weldable rebar coupler  can be fixed on steel structures through welding at one end for connecting reinforcement bars and steel plates; ordinary sleeves are used for connecting reinforcement bars. Weldable rebar coupler are used for connecting reinforcement bars between rigid steel columns. The difference between weldable rebar couplers and ordinary rebar coupler is the 45-degree chamfering process of the weldable rebar couplers, which is not present in the ordinary rebar coupler. Additionally, the lengths of weldable couplers vary, and technical parameters such as length, pitch, and thread angle depend on the needs of the construction.  Welding characteristics of weldable rebar couplers 1. Reliable connection quality and fast construction speed; 2. Welding joint quality meets the higher level requirements of Grade I joint performance in the industry standard “General Technical Specification for Mechanical Connection of Reinforcement Bars”
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Preventative Measures for Prevent Cold Extrusion Sleeve Crack

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In cold extrusion forming, the cracking of the   sleeve   is caused by transverse tearing. It can be avoided by the following methods: 1. Reduce friction to decrease the additional tensile stress on the metal surface. This can be achieved by improving extrusion lubrication conditions or using smoother die surfaces. 2. Control the extrusion temperature to prevent excessive temperature from reducing the tensile strength of the metal surface. This can be achieved by selecting appropriate extrusion temperatures or improving the cooling system. 3. Control the extrusion speed to avoid excessive additional tensile stress on the metal surface. This can be achieved by adjusting the operating parameters of the extrusion machine or using more suitable extrusion speeds. In summary, in order to prevent cracking during cold extrusion forming, it is important to strictly control process parameters and take appropriate measures to reduce friction, control extrusion temperature and speed. This can effe
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