#bar lock rebar steel coupler

[dladto]

Bolt Nut Rebar Coupler

This type coupler provides a cost effective method of jointing reinforcing bars, particularly when the fixed bar is already in place and there is insufficient place for hydraulic swagging press. They are easy to install and suitable for yield strength of grade 500 reinforcing bar. Neither bar end preparation to form the thread, nor bar rotation are required. Mechanically bolted couplers can also be used to join imperial, plain round or deformed reinforcing bars.

Features:

1.Full-tension splice, bar break under tensile tests.

2.Easy operation, installation. Neither bar thread nor bar rotation is needed.

3.Full trace ability of material origin or production batch.

4.Manufactured under strict quality assurance plan ISO9001

[321arka]

In the realm of construction and engineering, the proper connection of reinforcing bars (rebars) is critical to ensuring the structural integrity and strength of various concrete structures. Traditionally, rebar splicing has been accomplished through the labour-intensive method of lapping rebars, which involves overlapping the bars and tying them together with wire.

However, with advancements in technology, mechanical couplers have emerged as a more efficient and reliable alternative for connecting rebars.

Mechanical couplers are innovative devices that provide a quick, sturdy, and cost-effective solution for rebar splicing. In this article, we will explore the uses, types, advantages, and disadvantages of mechanical couplers, as well as the methods of their application and how they serve as an alternative for lapping rebars.

I. What are Mechanical Couplers?

A mechanical coupler is a device designed to join two rebars together without the need for time-consuming and labour-intensive traditional methods like lapping. It is essentially a threaded sleeve that houses the ends of two rebars and connects them through a mechanical process. These couplers are typically made from high-strength steel and are precisely manufactured to ensure precise alignment and load transfer between the two rebars.

II. Types of Mechanical Couplers

1. Threaded Couplers: Threaded couplers are among the most common types of mechanical couplers. They consist of a cylindrical sleeve with internal threads on both ends, allowing it to be screwed onto the threaded ends of the rebars. Threaded couplers come in various designs, such as parallel threaded couplers, tapered threaded couplers, and positional couplers.

2. Grout-Filled Couplers: Grout-filled couplers are designed to be filled with a special grout material that bonds the rebars together within the sleeve. The grout enhances the load transfer capacity and provides corrosion protection for the rebars.

3. Weldable Couplers: Weldable couplers are particularly useful in pre-fabrication applications. They have end plates that can be welded directly to the rebars, creating a robust connection.

4. Upset Couplers: Upset couplers involve enlarging the ends of the rebars through a process known as upsetting. The enlarged ends are then inserted into the coupler and secured with a locking mechanism.

III. Advantages of Mechanical Couplers

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[adtomall1998]

The Classification of Rebar Mechanical Couplers

Rebar couplers are combinators to connect rebars, with internal threads to match the screw threads. It has 6 different types and can be deployed in these different ways.

1. Standard Connection Rebar Couplers

Standard Connection Rebar Couplers are designed for situations that rotations are possible and limitless. By using Standard Connection Rebar Couplers, one steel bar can meet at the opposite side of the end force of the bridge piece. Standard and diameter-varied couplers are optional.

2. Lengthened Connection Rebar Couplers

Lengthened Connection Rebar Couplers are designed for situations that rebars are too long and dense, rotations are limited. Couplers are fully screwed in the lengthened thread of rebar in advance, then reverse screwed in the end thread of the rebar that is being connected. To lock the coupler, just twist the rebar for half to one turn. Standard couplers are optional.

3. Locknut-added Connection Rebar Couplers

Lengthened Connection Rebar Couplers Designed for situations that rebars can't rotate, such as hooked rebars and dockings of bridges, place piles reinforcement cages. Lock the coupler by screwing the locks and rebars in the lengthened thread in advance, then screw in the thread of another rebar's end and lock the coupler with the locknut. Standard and flare couplers with locknuts are optional.

4. Double-sided Thread Connection Rebar Couplers

Double-sided Thread Connection Rebar Couplers are designed for situations that rebars can't rotate but internal forces of the rebars are adjustable, such as construction joints and post cast strips. The coupler is equipped with double-sided threads, which are able to release and tighten two rebars in one direction.

ADTOMall is a leading professional manufacturer of rebar couplers. We are glad to give you support. Anything needed, please feel free to contact us. Click here to know "the disassembly steps and installation inspection of rebar coupler".

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Four Different Types of Rebar Mechanical Splices

#1 Coupler for Thread-Deformed Bar

This type of deformed bar comes with special bars with thread-like rolled deformations. These are assembled with lock nuts and threaded couplers, then the nuts are tightened to the specified torque.

#2 Upset Straight Thread Coupler

Upset Straight Thread Coupler is used to produce a full-length mechanical joint between reinforcing bars with upsetting ends. It can connect rebars of the same or different diameters laterally, vertically and slantingly. The coupler consists of a coupler with internal straight threads at each end that joins two upset end reinforcing bars with matching external threads.

#3 Non-upset thread Coupler

Non-upset thread Coupler consists of internal straight threads at each end that join two reinforcing bars with matching external threads. It is used to reduce the net cross-sectional area of the reinforcing bar. This type of splice comes in three pieces, the two bar ends, and the internally threaded coupler.

#4 Cold-Swaged Threaded Coupler

Cold-Swaged Threaded Coupler is made of seamless steel sleeves that are placed at the end of reinforcing bars. These are deformed onto the reinforcing bar profile to produce mechanical interlock. This consists of pre-threaded components, which are swaged onto the reinforcing bars using a swaging press with special dyes. Splicing of the bars is completed by installing one pre-threaded component into the other.

[dladto]

Rebar Couplers used in Road and Bridge Pile Foundations

Generally, the connection of reinforcing cages in road and bridge pile foundations is use threaded rebar couplers and upsetting forged rebar coupler.

When using threaded rebar couplers, one end of the steel bar needs to be processed into a threaded end that is longer than the coupler length. The coupler and lock nut are then screwed onto the extended threads. After aligning two reinforcing cages, the coupler is rotated downward to connect the two cages. The advantage of this connection method is that it is easy to construct, but the disadvantage is that there are exposed threaded ends.

Another connection method is using upsetting forged rebar coupler. In this method, the end of the steel bar is first enlarged using a steel bar enlarging machine and then threaded using a steel bar threading machine. This method requires a larger investment and much labor, but provides a better connection effect.

[321arka]

In the realm of construction and engineering, the proper connection of reinforcing bars (rebars) is critical to ensuring the structural integrity and strength of various concrete structures. Traditionally, rebar splicing has been accomplished through the labour-intensive method of lapping rebars, which involves overlapping the bars and tying them together with wire.

However, with advancements in technology, mechanical couplers have emerged as a more efficient and reliable alternative for connecting rebars.

Mechanical couplers are innovative devices that provide a quick, sturdy, and cost-effective solution for rebar splicing. In this article, we will explore the uses, types, advantages, and disadvantages of mechanical couplers, as well as the methods of their application and how they serve as an alternative for lapping rebars.

I. What are Mechanical Couplers?

A mechanical coupler is a device designed to join two rebars together without the need for time-consuming and labour-intensive traditional methods like lapping. It is essentially a threaded sleeve that houses the ends of two rebars and connects them through a mechanical process. These couplers are typically made from high-strength steel and are precisely manufactured to ensure precise alignment and load transfer between the two rebars.

II. Types of Mechanical Couplers

1. Threaded Couplers: Threaded couplers are among the most common types of mechanical couplers. They consist of a cylindrical sleeve with internal threads on both ends, allowing it to be screwed onto the threaded ends of the rebars. Threaded couplers come in various designs, such as parallel threaded couplers, tapered threaded couplers, and positional couplers.

2. Grout-Filled Couplers: Grout-filled couplers are designed to be filled with a special grout material that bonds the rebars together within the sleeve. The grout enhances the load transfer capacity and provides corrosion protection for the rebars.

3. Weldable Couplers: Weldable couplers are particularly useful in pre-fabrication applications. They have end plates that can be welded directly to the rebars, creating a robust connection.

4. Upset Couplers: Upset couplers involve enlarging the ends of the rebars through a process known as upsetting. The enlarged ends are then inserted into the coupler and secured with a locking mechanism.

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Why Should Rebar Cage Be Connected with Rebar Coupler?

For construction site welding, joint quality is not easy to guarantee. The reason are as follows: 1. There is a shortage of qualified welders；The welding quality is greatly affected by the climate. In cold regions and south regions with rainy days, welding cools fast and is easy to brittle in winter. The weldability of the steel bar is the basic requirement to ensure the welding quality, but now the quality of the steel bar is not stable, and some places even use fake products. Therefore, welded joints is not recommended for the longitudinal steel bar of frame beam and column. At the same time, according to the regulations, the longitudinal steel bar of the beam and column should not be welded with the stirrup, tie bar and embedded parts. Our rebar mechanical connection technology has been developed in the late eighties and has been developed and applied with cold extrusion rebar coupler. In recent years, the steel bar connection technology developed rapidly, with various of types entering the market, including Upsetting Forged Rebar Coupler, Parallel Threading Rebar Coupler, Cold Extrusion Rebar Coupler, Bar lock coupler, Grouting Rebar Coupler, Weldable rebar coupler, Taper Rebar Coupler etc., which has played a great role in promoting the development and enhancement of technology in the construction industry.

[dladto]

Clamping Sleeve Connection

Today let's take a look at the application field of the clamping sleeve connection.

Application fields of clamping sleeve connection joints:

1. Clamping sleeve connection are mainly used in the situation where the two steel bars cannot meet in the connecting sleeve and only can be locked by eliminating the thread gap by its locking force.

2. The use condition of clamping sleeve connection is that the two connected steel bars are restricted by rotation and axial movement.

Therefore, the clamping sleeve connection is used for the mutual butt joint of bent steel bars, bridges, cast-in-place piles and other steel cages.

Changsha DLADTO Rebar Splice Co., Ltd is a professional rebar coupler producer, we have been in this field for a long time with customers for all over the world. If you have any inquiry, welcome to contact us.

[adtomall1998]

The Classification of Rebar Mechanical Couplers

Rebar couplers are combinators to connect rebars, with internal threads to match the screw threads. It has 6 different types and can be deployed in these different ways.

1. Standard Connection Rebar Couplers

Standard Connection Rebar Couplers are designed for situations that rotations are possible and limitless. By using Standard Connection Rebar Couplers, one steel bar can meet at the opposite side of the end force of the bridge piece. Standard and diameter-varied couplers are optional.

2. Lengthened Connection Rebar Couplers

Lengthened Connection Rebar Couplers are designed for situations that rebars are too long and dense, rotations are limited. Couplers are fully screwed in the lengthened thread of rebar in advance, then reverse screwed in the end thread of the rebar that is being connected. To lock the coupler, just twist the rebar for half to one turn. Standard couplers are optional.

3. Locknut-added Connection Rebar Couplers

Lengthened Connection Rebar Couplers Designed for situations that rebars can't rotate, such as hooked rebars and dockings of bridges, place piles reinforcement cages. Lock the coupler by screwing the locks and rebars in the lengthened thread in advance, then screw in the thread of another rebar's end and lock the coupler with the locknut. Standard and flare couplers with locknuts are optional.

4. Double-sided Thread Connection Rebar Couplers

Double-sided Thread Connection Rebar Couplers are designed for situations that rebars can't rotate but internal forces of the rebars are adjustable, such as construction joints and post cast strips. The coupler is equipped with double-sided threads, which are able to release and tighten two rebars in one direction.

ADTOMall is a leading professional manufacturer of rebar couplers. We are glad to give you support. Anything needed, please feel free to contact us. Click here to know "the disassembly steps and installation inspection of rebar coupler".

[adtomall1998]

Different Types of Rebar Mechanical Splices

There are many types of rebar mechanical splice in the construction materials market. Basically, they can be divided into the following categories.

Based on the category of ‘tension- compression’, ‘compression only’ and ‘tension only’ there are different types of rebar mechanical splices available. Each of them is explained below.

1．Coupler for Thread-Deformed Bar

This type of deformed bars comes with special bars with thread-like rolled deformations. These are assembled with lock nuts and threaded couplers, then the nuts are tightened to the specified torque.

2．Upset Straight Thread Coupler

Upset Straight Thread Coupler is used to produce a full-length mechanical joint between reinforcing bars with upsetting ends. It can connect rebars of the same or different diameters laterally, vertically and slantingly. The coupler consists of a coupler with internal straight threads at each end that joins two upset end reinforcing bars with matching external threads.

3．Non- upset thread Coupler

Non- upset thread Coupler consists of internal straight threads at each end that join two reinforcing bars with matching external threads. It is used to reduce the net cross-sectional area of the reinforcing bar. This type of splice comes in three pieces, the two bar ends and the internally threaded coupler.

4．Cold-Swaged Threaded Coupler

Cold-Swaged Threaded Coupler is made of seamless steel sleeves that are placed at the end of reinforcing bars. These are deformed onto the reinforcing bar profile to produce mechanical interlock. This consists of pre-threaded components, which are swaged onto the reinforcing bars using a swaging press with special dyes. Splicing of the bars is completed by installing one pre-threaded component into the other.

5．Taper-Threaded Coupler

Taper-Threaded Coupler is designed for applications that require the joining of reinforcing bars. The compact design of each coupler ensures suitability for use in confined situations where space is restricted or where the loss of cover must be minimised. The couplers are normally supplied fitted to the end of the threaded bar, requiring only the engagement and tightening of the adjoining bar on site.

6．Straight Threaded Coupler with Upset Rebar Ends

Straight Threaded Coupler with Upset Rebar Ends consists of forming heads on the ends of the bars that are connected using a hydraulic machine. It is designed to fit between closely-spaced bars.

7．Grout-Filled Coupling Sleeve

Grout-Filled Coupling Sleeve is filled with grout that provides a mechanical bond between rebar deformations and grooves on the inside of the sleeve. This is filled with a cement-based, non-shrink, high-early strength grout. The range comprises two standard coupler types: Full-grout sleeves and Half-grout sleeves.

8．Combo Grout-Filled/Threaded Sleeve

Combo Grout-Filled/Threaded Sleeve is designed for the connection of precast elements. Each sleeve features a threaded end that is used for the connection to reinforcement at the precast element and a wide cavity to perform a grout connection at site. The wide mouth opening of the sleeve allows for minor bar misalignment during erection. The wide mouth also allows for transitioning between different bar sizes.

9．Metal-filled coupling Sleeve

Metal-filled coupling Sleeve is placed end to end in the metal sleeve with a molten metal filler in the tap hole. The filler material flows between the bars and the sleeve, solidifying in the deformations of the rebar and the internal ribs of the sleeve, forming a mechanical interlock.  

10．Cold-Swaged Coupling Sleeve

Cold-Swaged Coupling Sleeve is used for the connection of ribbed rebar. It is made of carbon structural steel and can connect reinforcing bars with a diameter of 16 to 40 mm. The sleeve uses a hydraulic swaging press with a special dye to deform the sleeve around the ends of the spliced reinforcing bars. This produces a positive mechanical interlock with the reinforcing bars.

11．Shear Screw Coupling Sleeve

Shear Screw Coupling Sleeve consists of a coupling sleeve with shear head screws which are designed to shear off at a specified torque.

12．Extruded Coupling Sleeve

Extruded Coupling Sleeve is a cold extruding coupling sleeve that connects two reinforcing bars by extruding a coupler onto the reinforcing bars.  

13．Coupling Sleeve with Double Wedge

This type of sleeve is made of a ductile iron sleeve that consists of two internal wedges. Two series of cone-pointed screws are arranged along the sleeve length.

14．Coupling Sleeve with Shear Bolt/Wedge

Coupling Sleeve with Shear Bolt/Wedge is designed to deliver a quick and simple method of splicing of 12 mm – 20 mm bar. Installation is made in seconds by overlapping the rebar in the steel sleeve and driving the wedge pin between the bars with a portable hydraulic hand tool. The coupling sleeve is oval in cross-section permitting the overlapping of two reinforcing bars of the same diameter in the sleeve.

15．Dowel Bar Mechanical Splice

This is a two-piece, upsized parallel threaded, mechanical splice that eliminates protruding dowels. No welding or machining is required for the installation of this splice and the threading operation does not reduce the nominal cross-sectional area of the bar.

16．Compression-only Mechanical Splice

This type of splice can resist compression stress merely. The compressive stress is transferred by vertical bearing from one bar to another one. Compression only mechanical splices can be used when tension stress does not occur.

Above is all kinds of rebar splice at ADTOMall. For further information, please contact us directly.

[adtomall1998]

Four Different Types of Rebar Mechanical Splices

#1 Coupler for Thread-Deformed Bar

This type of deformed bar comes with special bars with thread-like rolled deformations. These are assembled with lock nuts and threaded couplers, then the nuts are tightened to the specified torque.

#2 Upset Straight Thread Coupler

Upset Straight Thread Coupler is used to produce a full-length mechanical joint between reinforcing bars with upsetting ends. It can connect rebars of the same or different diameters laterally, vertically and slantingly. The coupler consists of a coupler with internal straight threads at each end that joins two upset end reinforcing bars with matching external threads.

#3 Non-upset thread Coupler

Non-upset thread Coupler consists of internal straight threads at each end that join two reinforcing bars with matching external threads. It is used to reduce the net cross-sectional area of the reinforcing bar. This type of splice comes in three pieces, the two bar ends, and the internally threaded coupler.

#4 Cold-Swaged Threaded Coupler

Cold-Swaged Threaded Coupler is made of seamless steel sleeves that are placed at the end of reinforcing bars. These are deformed onto the reinforcing bar profile to produce mechanical interlock. This consists of pre-threaded components, which are swaged onto the reinforcing bars using a swaging press with special dyes. Splicing of the bars is completed by installing one pre-threaded component into the other.

[adto-office-booth]

Do You Know ADTO Rebar Connection System?

ADTO Rebar Connection System is a high quality, economical connection system of reinforcement. ADTO Rebar Connection System is a simple, efficient method for connecting reinforcement steel, which eliminates the disadvantages of the traditional procedure of lapped joints. The lapped joints system may provide long-term consumption, greater rebar congestion, and unsafe usage in seismic zones.

The design of the rebar couplers allows for a connection of the reinforcement steel in which the characteristics are equivalent to uninterrupted rebar, and the transfer of loads is made in the bar, not in the concrete as it is for lapped joints. The shape and the metric thread allow for easy mounting at the construction site or in the prefab factory using standard tools.

The characteristics and advantages of the ADTO Rebar Connection System are:

- Used for reinforcement steel with a diameter from 10 mm to 40 mm.

- The full diameter or cross-section of the bar can be used.

- Complete connection of the reinforcement.

- Suitable for dynamic and seismic loads.

- Slip value of the system under 0.1 mm.

- Additional preparation of reinforcement steel is not necessary.

- Suitable for all types of reinforcement steel according to the European and American norms.

- The shape, height, and type of the ribs of the reinforcement steel have no influence on the connection.

- Since the dimension of the outer diameter is minimal, a better concrete cover is generated, and reinforcement steel congestion can be prevented.

- The contact surfaces of the couplers exclude the use of lock-nuts.

- Every diameter and length of the reinforcement steel, straight or bent, can be fitted to a coupler and can be easily connected on site.

Installation:

- A nut-wrench is not required for tightening the coupling. A pipe-wrench or torque wrench has to be used to tighten the couplers and to prevent thread movement.

- Special tools, power sources, and special training of personnel are not required.

- The metric thread and the connection method allow for fast, easy control of the connection.

- The mounting time is reduced to a minimum.

Characteristics:

- The couplers are delivered in a standard, electrolytically galvanized version, thereby preventing rust.

- At the client’s request, the couplers can be made from stainless steel.

[adto-office-booth]

Do You Know ADTO Rebar Connection System?

ADTO Rebar Connection System is a high quality, economical connection system of reinforcement. ADTO Rebar Connection System is a simple, efficient method for connecting reinforcement steel, which eliminates the disadvantages of the traditional procedure of lapped joints. The lapped joints system may provide long-term consumption, greater rebar congestion, and unsafe usage in seismic zones.

The design of the rebar couplers allows for a connection of the reinforcement steel in which the characteristics are equivalent to uninterrupted rebar, and the transfer of loads is made in the bar, not in the concrete as it is for lapped joints. The shape and the metric thread allow for easy mounting at the construction site or in the prefab factory using standard tools.

The characteristics and advantages of the ADTO Rebar Connection System are:

- Used for reinforcement steel with a diameter from 10 mm to 40 mm.

- The full diameter or cross-section of the bar can be used.

- Complete connection of the reinforcement.

- Suitable for dynamic and seismic loads.

- Slip value of the system under 0.1 mm.

- Additional preparation of reinforcement steel is not necessary.

- Suitable for all types of reinforcement steel according to the European and American norms.

- The shape, height, and type of the ribs of the reinforcement steel have no influence on the connection.

- Since the dimension of the outer diameter is minimal, a better concrete cover is generated, and reinforcement steel congestion can be prevented.

- The contact surfaces of the couplers exclude the use of lock-nuts.

- Every diameter and length of the reinforcement steel, straight or bent, can be fitted to a coupler and can be easily connected on site.

Installation:

- A nut-wrench is not required for tightening the coupling. A pipe-wrench or torque wrench has to be used to tighten the couplers and to prevent thread movement.

- Special tools, power sources, and special training of personnel are not required.

- The metric thread and the connection method allow for fast, easy control of the connection.

- The mounting time is reduced to a minimum.

Characteristics:

- The couplers are delivered in a standard, electrolytically galvanized version, thereby preventing rust.

- At the client’s request, the couplers can be made from stainless steel.