JG/T 163-2013Couplers for Rebar Mechanical Splicing (English PDF)

3.1 Rebar Mechanical Splicing

Rebar mechanical splicing refers to a splicing method which transmits force in one steel reinforcing bar to another steel rebar through the mechanical occlusion effect between the rebar and the coupler, or the load-bearing effect on the end face of the steel rebar.

3.2 Coupler

Coupler refers to steel sleeve for mechanical splicing of steel rebars; it may transmit axial tensile force or pressure of steel rebars.

3.7 Parallel Threaded Coupler for Splicing Rebars with Threads Roll on to

Rebar End

Parallel threaded coupler for splicing rebars with threads roll on to rebar end refers to parallel threaded coupler which may be spliced with threads roll on to rebar end.

3.8 Taper Threaded Coupler

Taper threaded coupler refers to a threaded coupler which may be spliced with taper threads of steel rebars and has taper threaded inner hole.

3.15 Threaded Coupler with One Slope at Thread End

Threaded coupler with one slope at thread end refers to a parallel threaded coupler which has an internal chamfer for the centering of steel rebars on one end and extended length than the standard coupler.

3.16 Thread Plug Gauge

Thread plug gauge refers to a measuring appliance which has consistent thread profile with the thread being tested and can reflect the boundary conditions of the inner thread being tested.

4.1 Classification

In accordance with the type of rebar mechanical splices, coupler may be classified into parallel threaded coupler, taper threaded coupler and coupler for squeezing sleeve splicing of rebars. Furthermore, parallel threaded coupler may be classified into parallel threaded coupler for splicing rebars with upsetting end, parallel threaded coupler for splicing rebars with rib stripped before rolling of threads, parallel threaded coupler for splicing rebars with threads roll on to rebar end.

4.2 Type

4.2.1 Parallel threaded coupler

There are four commonly used types of parallel threaded coupler. standard coupler for parallel threaded splicing of rebars, parallel threaded coupler with different inner diameter, parallel threaded coupler with left and right hand thread, parallel threaded coupler with one slope at thread end, as it is shown in Figure 1.

4.2.3 Coupler for squeezing sleeve splicing of rebars

There are two commonly used types of coupler for squeezing sleeve splicing or rebars.

standard coupler for squeezing sleeve splicing of rebars, coupler for squeezing sleeve splicing of rebars with different inner diameter, as it is shown in Figure 3.

4.3 Marking

4.3.1 Method of marking

The marking of couplers shall be constituted of four parts. name code, type code, main parameter (strength grade of rebar) code and main parameter code (nominal diameter of rebar), etc.

4.3.2 Examples

5.1 Raw Materials

5.1.1 Threaded coupler

The raw materials of threaded coupler shall comply with the following requirements.

5.1.2 Coupler for squeezing

The raw materials of coupler for squeezing shall select appropriate calendering steel products in accordance with the designation of steel rebars to be spliced. Quality carbon structural steels with the designation of No. 10 and No. 20, or, carbon structural steels with the designation of Q235 and Q275 should be selected. The shapes and mechanical properties shall comply with the stipulations in GB/T 700, GB/T 702 and

GB/T 8162; the actually tested mechanical properties shall comply with the stipulations in Table 1.

5.2 Shapes of Coupler

5.2.1 Threaded coupler

The shapes of threaded coupler shall comply with the following requirements.

5.2.2 Coupler for squeezing

The shapes of coupler for squeezing shall comply with the following requirements.

5.3 Dimensions and Tolerances of Coupler

5.3.2 Taper threaded coupler

The dimensions and tolerances of taper threaded coupler shall comply with the following requirements.

5.3.3 Coupler for squeezing

The dimensions and tolerances of coupler for squeezing shall comply with the following requirements.

5.5.2 Inspection of products being manufactured

Inspection items of couplers being manufactured shall at least include. external diameter, internal diameter, length and thread dimensions.

5.5.3 Traceability

The traceability of coupler manufacture shall comply with the following requirements.

5.6 Anti-rust

Before exiting factory, couplers shall have anti-rust measures.

6.1 Raw Materials

6.1.1 Sampling

The sampling of raw materials of coupler shall comply with the stipulations in GB/T

2975.

6.2 Coupler

6.2.1 Shapes, dimensions and threads

The inspection items of the shapes, dimensions and threads of coupler, the measuring tools, gauges and inspection methods shall comply with the stipulations in Table 7.

6.2.2 Mechanical properties

7.1 Raw Materials

7.1.1 Inspection conditions

The inspection of raw materials of coupler shall be conducted before the manufacture of coupler.

7.2 Coupler

7.2.1 Classification

There are two types of coupler inspection. exit-factory inspection and type inspection.

7.2.2 Exit-factory inspection

The exit-factory inspection of coupler shall comply with the following requirements.

8.1 Marking

8.1.1 Composition

On the surface of coupler, distinct and durable marking shall be imprinted. The marking shall include marks, code of manufacturer and manufacture batch No. that allows traceability to the performance of raw materials that comply with the stipulations in 4.3.

The code of manufacturer may be characters or patterns. Manufacture batch No. may be figures, or a combination of figures and symbols.

8.2 Packaging

8.2.1 Packaging materials and surface marks

Couplers exiting factory shall adopt cardboard boxes, woven bags or other reliable bags. On the surface of the packaging materials, indicate the name of product, type of coupler, quantity, applicable rebar specifications, date of manufacture, manufacture batch No., and name, address and contact information of manufacturer, etc.

8.3 Transportation and Storage

During the transportation and storage, couplers shall be properly protected, and kept away from raindrops, dirt or damage.

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