Ribbed radial compression connection technology

Ribbed radial compression connections

1 scope

This technology is applicable to industrial and civil buildings and structures in reinforced concrete structure ⅱ-ⅲ class reinforced ribbed 20~40mm in diameter radial crushing connection construction.

2 construction preparation

2.1 materials and equipment:

2.1.1 steel grade, diameter (L8~40mm) must comply with the design requirements and national standards, there should be quality certificate and retest report. Imported steel has to pressed for type inspection, meet performance requirements before use.

2.1.2 steel sleeve made of low carbon killed steel, which should meet the requirements of mechanical properties. II sleeves, tubular steel with yield strength s ≥ σ 205N/mm2; tensile strength σ b=335~520N/mm2, σ s of elongation ≥ 20%. ⅲ class reinforced sleeve s σ ≥ 230N/mm2, b=390~520N/mm2 σ, σ s ≥ 20%. Diameter greater than 5mm, with a variable cross section steel sleeve. Sleeve specifications model G18, G20, G22, G25, G28, G32, G36, G40, sleeve should have a factory certificate, partial acceptance.

2.1.3 equipment: high pressure pump, tubing, pressure clamp, steel Extrusion die, hanging car, balancer, angle to the wheel, marking tool and check for creasing tools such as card board caliper.

Note: ribbed pressed is to insert the two need to connect steel steel sleeve, use radial compressed steel sleeve clamp pressure, to produce plastic deformation on deformed steel sleeve with integral connection method for steel bars are connected closely.

2.2 operating conditions:

2.2.2 participation crimp contact the personnel must be trained and certified until passing the examination.

2.2.2 remove steel sleeve and reinforced extruded parts rust dirt, sand and other debris.

2.2.3 reinforced with steel sleeve test sets, such as reinforcement bars, Horseshoe, Flash, bending and longitudinal rib size large should be corrected by hand-grinding mill, prohibit the use of electrical welding and cutting most of Super.

2.2.4 bar end positioning marks and check marks to ensure that steel into the sleeve length. Landmarks from the end part of the distance to the steel sleeve length 1/2.

2.2.5 check equipment is normal, and pressure, in line with the requirements before operation.

3 operational processes

3.1 process:

Steel sleeve, reinforced extruded parts inspection, cleaning and correction → steel end crimp marks →

Reinforced steel sleeve → press → insert check acceptance

3.2 steel steel sleeve should be inserted according to the marking requirements, ensure that the connector length to prevent air pressure. Axis and axis of steel sleeve dowels should be kept the same axis, eccentric and prevent bending.

3.3 in pressure received joint at hanging good balance device and pressure clamp, received good into, and back oil tubing, up moving super high pressure pump, regulation good pressure relay by needed of oil pressure, then will Xia pressure die card board open, out Xia die, put extrusion machine machine frame of opening insert was extrusion of with rib steel of connection sets in the, plug back Xia die, lock died card Board, pressure clamp in balance device of balance force role Xia, alignment steel sleeve by needed pressure received of mark at, control extrusion machine reversing valve for extrusion. Locked card plates with crimped ends open, remove the lower die, exit extruders, complete extrusion construction.

3.4 when squeezed, get alignment sleeve clamp pressure indentation marks, and perpendicular to the transverse ribs of pressed steel. Squeeze from the crimp sleeve by road to Central end, such as φ 32 reinforcement at each end 6 indentation, and finally checks the indentation. The minimum diameter and the total width of the indentation required to comply with the requirements shown in Figure 4-35.

Figure 4-35

3.5 in order to reduce aerial work and accelerate the construction schedule, first on the ground pressing half a joint in the construction area reserved socket and the other end into the steel reinforcement, according to technological requirements, squeeze the other end.

4 quality criteria

4.1 project:

4.1.1 steel variety and quality must comply with the design requirements and the provisions of the relevant standard.

Inspection method: check the factory certificate and test report.

4.1.2 steel sleeve of material and mechanical properties of steel sleeve standard requirements must be met, without cracks, folds and other defects on the surface.

Inspection method: check the factory certificate.

4.1.3 crimp contact strength must be qualified. 500 a same specifications, and same pressure received process completed of steel joint for a, and with batch joint distribution not than three a floors, insufficient 500 a still for a, random extraction 3 a try pieces for tensile strength test, and each layer many Yu 1 a, tensile strength are shall not below was pressure received steel tensile strength standard value of 1.05 times times, if which has a try pieces not meet requirements Shi, should again extraction double (6 a) try pieces for retest, retest results still has a try pieces not qualified, is the batch joint for not qualified products.

Inspection methods: inspection and test reports.

4.2 Basic project:

4.2.1 the appearance of joints should be individually self-test based on 10% connector. Indentation may not have hollow, split, bent connector must not be greater than 4 °, reinforced insert steel sleeve length must comply with the regulations. If you do not comply with the requirements of the joint should be removed again.

Inspection method: observation, or check with a ruler.

4.2.2 splices indentation depth is not sufficient to be filled. Overpressure shall be removed to squeeze again. Minimum diameter steel sleeve indentation and total width, should be consistent with steel sleeve supplied manufacturers with the technical requirements.

Inspection method: observation and check with a ruler.

5 finished product protection

5.1 prefabricated connection must be on the ground with a wood mat well, neatly specifications.

5.2 socket without mortar and other debris.

5.3 compression connector at high altitude, to set up a temporary shelf, not pedal step on the joints.

6 quality problems to be noticed

6.1 carefully check the quality of steel sleeve, the material does not meet the requirements, no certificate of quality, as well as the appearance of substandard steel sleeve, shall not be used.

6.2 Note reinforced insert steel sleeve length, carefully check the tag line of steel, from the air pressure.

6.3 squeeze a stricter control of its pressure, carefully check the indentation depth, not enough depth to fill, extra deep to remove connectors to reconnect.

7 quality records

This standard shall meet the following quality records:

Steel quality certificate or test report 7.1.

7.2 steel mechanical performance test report.

7.3 steel sleeve certificate.

7.4 header test report form.

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