来源： 最后更新时间：2025-02-11 14:11:37 人气：94043

Before the cold extrusion connection of steel bars is carried out, markings (positioning marks, inspection marks) must be made at the end of the steel bars. The main purpose of the positioning marks is to indicate the position of the steel bars and the sleeve. As the steel sleeve elongates after extrusion, the positioning marks enter the joint, so the inspection marks are set up to conveniently check whether the position of the steel sleeve is correct.

Visual inspection of construction quality:

(1) Check whether the number of pressure joints meets the design requirements, and ensure that there is no shortage or heavy pressure. The operation should comply with relevant regulations.

(2) There shall be no visible cracks on the surface of the joint.

(3) Bending at the joint is ≤ 40.

(4) Inspection marks are visible on the steel bars at both ends of the joint, but no positioning marks are visible.

(5) When the number of non-conforming joints in the appearance inspection is less than 10% of the inspection book, the appearance quality of the batch of joints is evaluated as qualified. When the number of non-conforming joints exceeds 10% of the inspected number, the batch of joints should be re inspected one by one. The joints that fail the appearance inspection should be remedied, and those that cannot be remedied should be marked. Three specimens should be taken from the non-conforming machine head for tensile testing. If the strength of one specimen is lower than the design value, then the batch of joints is non-conforming.

Tensile performance inspection:

(1) On site inspection shall be conducted on 500 joints completed under the same specifications, grades, materials, and construction conditions as one batch for acceptance, and those less than 500 joints shall also be considered as one batch.

(2) Three randomly selected specimens from each batch of acceptance pieces are evaluated. When the uniaxial tensile testing heads of the three specimens meet the requirements, the batch of joints is qualified.

(3) If the tensile strength of one specimen does not meet the requirements, another 6 specimens should be taken for retesting. If one specimen fails the retest, then the batch of joints is unqualified.

Characteristics of cold extrusion sleeve:

1. Using national standard No. 20 steel, special manufacturing process, high dimensional accuracy, and reliable quality.

2. The steel sleeve cold extrusion connection technology is fast in construction and can save a lot of time compared to traditional welding methods during construction.

3. The steel sleeve cold extrusion connection technology is suitable for radial extrusion connection of ribbed steel bars with a diameter of 16-40 in reinforced concrete structures.

The construction process of cold extrusion connecting sleeve is as follows:

1) Check that the steel sleeve, steel bars, extrusion equipment, power supply, etc. must meet the construction requirements.

2) Mark with red paint at 100mm from the connected end of the steel bar.

3) Place a positioning mark at the end marked with red paint, and the distance between the positioning mark and the end of the steel bar is 1/2 of the length of the steel sleeve. Check the depth of steel bar insertion into the sleeve according to the positioning mark.

4) Insert the steel bars into the sleeve and use an extruder with a rated working pressure of 80 MPa and a rated extrusion pressure of 760 kN to press and connect the sleeve. Before squeezing, a qualified unit should be commissioned to calibrate the pressure of the oil gauge.

5) When operating the extruder, the pressure for squeezing the steel bars connected with diameter 25 should be controlled at 40 MPa, and the small diameter of the indentation should be between 37 mm and 39 mm. The indentation size should not be less than 50 mm, and 5 indentations should be made on each side as required. The indentation should be evenly distributed. When squeezing the next pass, due to reduced restraint, the pressure should be controlled to be 2 MPa to 4 MPa lower than the pressure of other indentation passes to prevent the diameter of the small indentation in the next pass from becoming smaller or exceeding the lower limit.

6) After the completion of the steel bar cold extrusion sleeve, a dedicated person will be sent to conduct quality inspection. When the inspection conditions are met, a qualified unit will be commissioned to conduct on-site random sampling inspection.

List of parameters for cold extrusion connection of national standard steel bars
规格	长度	外径	壁厚	单重	每包数量
Φ16	100	30	4.5	0.28	100
Φ18	118	34	5.7	0.47	70
Φ20	120	36	6	0.53	60
Φ22	132	40	6.8	0.74	45
Φ25	150	45	7.5	1.04	30
Φ28	162	50	8	1.45	25
Φ32	192	55	9	2	12或15
Φ36	216	63	10	2.83	10
Φ40	240	70	11	4.7	8

List of parameters for cold extrusion connection of iron standard steel bars
规格	长度	外径	壁厚	单重	每包数量
Φ14	95	28	4.5		120
Φ16	110	30	4.5	0.28	100
Φ18	125	34	5.7	0.47	70
Φ20	130	36	6	0.58	60
Φ22	140	40	6.8	0.75	45
Φ25	170	45	7.5	1.18	30
Φ28	190	50	8	1.58	25
Φ32	200	55	9	2	15
Φ36	220	63	10	3.14	10
Φ40	250	70	11	4.37	8

If the customer does not provide a definite type and specification of the sleeve, the customer should correctly explain their type, specification, and requirements, and sign the contract under the condition of mutual understanding between the supply and demand parties。

　1、The customer communicated the product type, specifications, and dimensions to our salesperson。

　2、Received customer specifications and dimensions, provided sleeve quotation (price list) for the customer。

　3、Specific agreement: delivery time, special requirements, and other matters。

　4、After placing the order and making payment, our company will arrange shipment as soon as possible。

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