What is Type 2 rebar?

Type II Rebar connections have a minimum pull out strength of 160% of the yield strength of the rebar. This is achieved by threading the rebar anchor (Fig. The Type II connection can be threaded using 2 different methods: A straight UNC thread or a tapered thread. Straight Thread: The advantage is consistency.

What is mechanical coupler?

Mechanical rebar connections, also known as mechanical splices or mechanical coupler, are used to join lengths of rebar together to transfer forces from one steel rebar to another.

How many types of mechanical splicing are there?

There are four major types of mechanical splices: Compression only mechanical splices or end bearing splices. Tension and compression mechanical splices. Mechanical lap splices or tension only mechanical splice.

What is a Lenton coupler?

nVent LENTON Standard Couplers are designed to splice the same diameter bars where at least one bar is free to be rotated and is not restricted in its axial direction. The couplers are machined to have taper threads at both ends, creating a mechanical butt splice of two sections of reinforcing steel.

What is a Type 2 splice?

A Type 2 mechanical splice, as defined in Section 21.1. 6.1(b) of the ACI 318 Code, is a mechanical splice that meets the requirements of a Type 1 mechanical splice and also develops the specified tensile strength of the reinforcing bar.

Where are mechanical couplers used?

Mechanical couplers are widely used in the present construction industry to joint two reinforcement bars together. The lapping of reinforcement is very difficult and time-consuming. Further, some costs also can be saved with mechanical couplers.

What is the minimum lap length?

What is the minimum lap length? For direct tension, the straight length of the lapping bar shall not be less than 15d or 20 cm. While in the case of compression lapping should not be less than 24d.

How is mechanical splicing done?

The principle of mechanical splice is simple and straightforward. Two fibers are stripped, cleaned and cleaved. They are then aligned and held in position either by epoxy resin or by mechanical clips. V-groove has been used widely in aligning optical fibers.

What is coupler construction?

A steel coupler is used to couple or joins two pieces of steel together in the building. Steel coupler consists of a sleeve that is threaded into which the bars to be joined can be screwed into. The coupler is built as screw connection reinforcement on a framework of working joints in concrete.

What kind of uses can couplers be used for?

The couplers are machined to have taper threads at both ends, creating a mechanical butt splice of two sections of reinforcing steel. Typical applications include column bar splicing (shearwalls, corewalls), beam bar splicing, future extension and segmental pours.

What are the locknuts on a mechanical coupler?

The locknuts at the both ends prevents the bars from slippage on the coarse threads. TYPE 4 – Metal sleeves swaged onto bars – Hydraulic press is used to swage the sleeves onto the ends of bars.

What’s the difference between Type 1 and type 1B couplers?

TYPE 1 – Couplers with parallel threads – For Type 1a, the threaded portion of the rebar is having smaller diameter than the other part. So, the load carrying capacity is reduced here. Thus, it is rarely used. For Type 1b, the threaded portion is having higher diameter than the rest to maintain the load capacity as the rest portion of the bar.

When to use transitional couplers on rebars?

Transitional couplers can be used to join the two different sizes of the bars and the positional couplers is used to join the two haves of the bars. TYPE 3 – Couplers with integral threads over full length bar – This is used with the high yielding rebars which is having helical deformations along its length.