Straight threaded socket connection is a kind of socket connection. Socket connection is actually commonly known as rebar mechanical connection, according to the "JGJ107-2016 rebar Mechanical connection technical regulations".

<center><p style="text-align:center"><img alt="" src="/uploads/allimg/20250802/1-250P2151353223.webp" width="" height="" title=""/></p><p style="text-align: left; text-indent: 2em;"><br/></p></center><center></center><p></p><p><span style="text-wrap-mode: nowrap;">　　</span>Straight threaded socket connection is a kind of socket connection. Socket connection is actually commonly known as rebar mechanical connection. According to the &quot;JGJ107-2016 Rebar Mechanical Connection Technical Regulations&quot;: The commonly used types of rebar mechanical connection joints are as follows：</p><p>　　Sleeve extrusion joint: A joint formed by the plastic deformation of the steel sleeve of the connecting piece and the tight bite of the ribbed steel bar through the extrusion force.</p><p>　　Tapered threaded joint: A joint formed by the bite of a special tapered thread at the end of the steel bar and the tapered thread of the connecting piece.</p><p>　　Upsetting straight threaded joint: A joint formed by the bite of the straight thread and the thread of the connecting piece after the upsetting of the steel bar end.</p><p>　　Rolling straight threaded joint: A joint formed by the bite of the straight thread and the thread of the connecting piece directly rolled by the end of the steel bar or rolled after stripping the ribs.</p><p>　　Molten metal filling joint: A joint formed by the reaction of a high-heat agent to produce molten metal filling between the steel bar and the connecting sleeve.</p><p>　　Cement grouting filling joint: The joint formed after hardening between the steel bar and the connecting sleeve is filled with special cement slurry.</p>

It is advisable to tie at 16 degrees, to weld at 16-25, and to connect mechanically at 25 and above. What should I do if the welding strength of the rebar connection sleeve is not enough? When the connecting sleeve of the steel bar is welded with the steel bar, it sometimes exhibits the appearance of insufficient st...

<p style="text-align: center;"><img src="/uploads/allimg/20250802/1-250P2152129264.webp" title="" alt="20250630085046_28427.jpg"/></p><p>1) The end face of the welded steel bar is unqualified. For example, the gap between the two steel bars is too large, and there are debris on the end face.&nbsp;</p><p>&nbsp;(2) The flame is not adjusted well during the welding process, the carbonization flame is not used in the initial heating, or the flame violates the crimping surface, forming the appearance of oxidation of the end face.&nbsp;</p><p>&nbsp;(3) During the welding process, the flame heating time is too long, and many carbon molecules are burned or the heat-affected zone is too large, and the grain thickens, which reduces the strength of the steel bar.&nbsp;</p><p>&nbsp;(4) If the heating temperature is too low or the heating time is too short, the base of the steel bar connecting to the steel bar will start to be pressurized before the welding temperature is reached. It is because some molecules at the base of the welding end face cannot be fully immersed and dispersed to form a weak strength.&nbsp;</p><p>&nbsp;(5) In the late stage of heating, the heater moves back and forth, forming uneven heating of steel bars.&nbsp;</p><p>&nbsp;The characteristics of the rebar connecting sleeve and the precautions during construction：</p><p>&nbsp;1. The steel connecting sleeve can greatly reduce the use of materials, and it is easy to manipulate, and it is not limited by the composition of steel bars.&nbsp;</p><p>&nbsp;2. The steel connecting sleeve can be prefabricated in advance, and different specifications can be formulated according to needs. It does not occupy the construction period and has high processing efficiency.&nbsp;</p><p>&nbsp;3. It can connect horizontal, vertical and oblique HRB335, HRB400 steel bars of the same diameter or reduced diameter. It is suitable for steel bar connectors in steel concrete structures of various structures that withstand the two-way forces of tension and pressure.&nbsp;</p><p>&nbsp;4. The connection is convenient, fast and simple. The construction does not require electricity, rain or shine, and can be constructed all day long.</p><p><br/></p>

1. The use of international No. 45 steel, special manufacturing technology, high dimensional accuracy and reliable quality. 2. It can be connected to HRB335 and HRB400 ribbed steel bars of Ф16-Ф40MM. 3. Tested by the Construction Engineering Quality Supervision and Inspection Center, it has reached the level I jo...

<p style="text-align: center;"><img src="/uploads/allimg/20250802/1-250P2152451A2.webp" title="" alt="20250623090546_66278.jpg"/></p><p>1. The use of international No. 45 steel, special manufacturing technology, high dimensional accuracy and reliable quality.&nbsp;</p><p>&nbsp;2. It can be connected to HRB335 and HRB400 ribbed steel bars of Ф16-Ф40MM.&nbsp;</p><p>&nbsp;3. Tested by the Construction Engineering Quality Supervision and Inspection Center, it has reached the level I joint standard in JGJ107-2010.&nbsp;</p><p>&nbsp;4. There are three series of standard type, positive and negative threaded type, and reducing type, with 52 varieties, which can meet the needs of connecting steel bars of the same diameter, reducing diameter and adjustable length and direction in horizontal, vertical, oblique and other parts of the building structure.&nbsp; Precautions for using reinforced socket connection：</p><p>&nbsp;1. The head must be tightened with a torque wrench with an accuracy of ±5%, and it is required to verify the torque wrench with a torque meter every six months. The steel bars should be straightened before cutting. The end face of the incision of the wire rolling machine should be perpendicular to the axis of the steel bar, and there must be no horseshoe shape or deflection.&nbsp;</p><p>&nbsp;2. The taper, tooth shape, pitch, etc. of the processed steel taper thread head must be consistent with the taper, tooth shape, and pitch of the connecting sleeve, and it has been tested by the supporting gauge. When processing steel taper threads, an aqueous solution of cutting lubricant should be used.&nbsp;</p><p>&nbsp;3. When connecting steel bars, the steel bars should be screwed into the connecting sleeve on the positive axis, and then tightened with a torque wrench. When the embedded joint is used, the position, specifications and quantity of the connecting sleeve should meet the design requirements. The exposed end of the connecting sleeve should have a sealing cover.&nbsp;</p><p>There are three common standards：</p><p>JGJ107 &quot;Technical Regulations for Mechanical Connection of Steel Bars&quot;</p><p>JG163 &quot;Rolling Straight Rebar Connection Joint&quot;</p><p>GB1499.2 &quot;Hot-rolled ribbed steel bar&quot;</p><p>2. Basic requirements of the standard</p><p>1. The latest version of GB1499.2-2007 (implemented on March 1, 2008) replaces the GB1499-1998 standard.，</p><p>1) Three grades of “fine-grain hot-rolled steel bars, HRBF335, HRBF400, and HRBF500&quot; have been added. The grain size is not thicker than grade 9, which are expressed as C3, C4, and C5 respectively. HRB335, HRB400, and HRB500 are represented by 3, 4, and&nbsp;</p><p>5. The meaning of HRB400 is: The English abbreviation HRB stands for hot-rolled ribbed steel bar, and 400 means that the yield strength is 400MPa.</p><p><br/></p>

Weldable steel socket is a steel connection socket between rigid steel columns. The difference from ordinary steel socket is that the weldable socket has a 45-degree chamfering process, which is not available in ordinary steel socket. Secondly, the length is also long and short, length, pitch, tooth angle and other tec...

<p style="text-align: center;"><br/></p><p style="text-indent: 2em;">Weldable steel socket is a steel connection socket between rigid steel columns. The difference from ordinary steel socket is that the weldable socket has a 45-degree chamfering process, which is not available in ordinary steel socket. Secondly, the length is also long and short, length, pitch, tooth angle and other technical parametersIt still mainly depends on the needs of the construction site. The materials are all the same. They are all made of No. 45 seamless steel pipes.</p><p style="text-indent: 2em;">&nbsp;The weldable sleeve is mainly used for the construction of steel joints between large steel columns and frame beams. The principle of the coupling process is that the sleeve used for the coupling is weldable and can be used to end the welding connection with the steel column. Because the connected sleeve is machined with an internal thread that can match the external thread of the end of the steel bar, the connection between the frame beam rib and the frame beam can be effectively terminated. During the construction of the connection, the licensed welder first welds the weldable sleeve with the internal thread to the steel column in the specified orientation, screws the steel bar with the right-handed thread into the weldable sleeve and connects it to Jianwang, a method of equal-strength connection of steel bars that transmits force from the weld and the thread together.</p><p><br/></p>

The rebar sleeve is the rebar connecting sleeve, also known as the rebar connecting joint, which is used to connect two independent rebars together. Reinforced steel sleeves are divided into first-class steel, second-class steel and third-class steel according to their different tensile strength, compressive strength a...

<p style="text-align: center;"><img src="/uploads/allimg/20250802/1-250P2154I0939.webp" title="" alt="20250217100247_57788.jpg"/></p><p style="text-indent: 2em;">The rebar sleeve is the steel bar connection sleeve, also called the rebar connector, which is used to connect two independent steel bars together. According to their own tensile strength, compressive strength and other properties, steel sleeves are divided into first-class steel, second-grade steel and third-grade steel. What is the grading standard of steel bar sleeves, and what are the differences between different grades of steel bar sleeves?<br/>1. A steel bar sleeve with a tensile strength greater than or equal to 1.1 times the ultimate tensile strength of the steel bar is a first-class steel bar connection sleeve. The first-class steel bar sleeve has the best tensile performance and is suitable for parts that require high tensile strength.<br/>2. The steel bar sleeve with tensile strength greater than or equal to the standard value of the ultimate tensile strength of the steel bar is a second-class steel bar sleeve. The tensile performance of the secondary steel bar sleeve is moderate, which can meet most of the steel bar connection requirements, and is the most cost-effective and most used.<br/>3. A steel bar sleeve with a tensile strength greater than or equal to 1.35 times the standard value of the yield strength of the steel bar is a third-class steel bar sleeve. The three-stage steel bar sleeve is suitable for the parts of the concrete structure that do not require high tensile strength, and is less used in actual construction.</p>

The cold extrusion sleeve is a connection formed by inserting the steel bar to be connected into the extrusion nut and squeezing the nut with extrusion pliers to cause a shape change and close pressing with the surface of the ribbed steel bar. Compared with the traditional steel bar lapping and welding process, this me...

<p style="text-align: center;"><img src="/uploads/allimg/20250802/1-250P2155134R2.webp" title="" alt="6360926831203125001611064.jpg"/></p><p>The cold extrusion sleeve is a connection formed by inserting the steel bar to be connected into the extrusion nut and squeezing the nut with extrusion pliers to cause a shape change and close pressing with the surface of the ribbed steel bar. Compared with the traditional steel bar lapping and welding process, this method has the characteristics of stable and reliable connector quality, not affected by the environment, can be constructed within 24 hours, and has the characteristics of strong seismic performance and low temperature resistance of the connector<br/>1. Material requirements: Cold-extruded steel bar sleeves should be manufactured using raw materials quenched and preferred 20# steel, and their hardness and physical properties should meet the specified standards.<br/>2. Appearance inspection: the appearance of the cold-extruded steel bar sleeve is flat, with no obvious shortcomings, no burrs, bubbles and other surface shortcomings;3. Specification accuracy: Cold-extruded steel bar sleeves should meet the specified standards and specified dimensional accuracy, including diameter, nominal diameter, thickness and other aspects;<br/>4. Mechanical properties: compressive strength, tensile strength, elongation and other aspects need to meet the specified standards.<br/>5. Corrosion resistance: Wear-resistant coatings or other efficient engineering and technical measures should be used to ensure service life and corrosion resistance.<br/>All in all, the requirements for cold-extruded steel bar sleeves in railway line standards are very strict to ensure that their quality and safety characteristics meet the standards and provide reliable application for railway line construction and operation</p>