Ribbed steel radial extrusion connection
1 scope
The technology standard is applicable to industrial and civil buildings and structures of reinforced concrete structures in the 20 ~ 40 mm diameter ribbed Ⅱ ~ Ⅲ level radial extrusion bar connection construction.
2 construction preparation
2.1 material and main equipments:
2.1.1 reinforced level, diameter (l8 ~ 40 mm) must comply with the design requirements and national standard, should have the factory quality certificate and retest report. Imported steel need to squeeze connection type inspection, conform to the requirements of the performance after use.
2.1.2 steel sleeve material is low carbon killed steel, its mechanical properties should meet the requirements. Ⅱ reinforced with sleeve yield strength sigma level s 205 n/p was; Tensile strength of sigma b = n / 335 ~ 520 was, elongation sigma s 20% or higher. Ⅲ reinforced with sleeve sigma level 230 or higher n/s was, sigma b = n / 390 ~ 520 was, sigma s 20% or higher. Difference is greater than 5 mm in diameter, with variable cross-section steel sleeve. G18 sleeve specifications, the G20, G22, G25, G28 and G32, G36, G40, transfering the sleeve should be the factory certificate, partial acceptance.
2.1.3 main machine has: ultra-high pressure pump station, tubing, pressure pliers, steel bar extrusion molding, hanging car, balancer, angular grinding wheel, delimit symbol tool and check the creasing the caliper tool such as card board.
Note: ribbed steel bar extrusion connection is insert need to connect two reinforced steel sleeve, using the clamp pressure along the radial compression steel sleeve, to produce plastic deformation, steel sleeve and connected by the deformation after reinforcement in close combination with the overall connection methods.
2.2 operation conditions:
2.2.2 for extrusion of joint operations personnel must be trained, and the related certificates until they have passed the examinations.
2.2.2 remove steel sleeve and reinforced extrusion parts of tarnishing, mortar and other sundry.
2.2.3 reinforced with steel sleeve try to cover, such as steel bar has a horseshoe, flash, bending or large longitudinal size, should be corrected or by hand wheel grinding, with welding cutting large part is prohibited.
2.2.4 reinforced end should be positioning mark and check mark, to ensure that the steel into the length of the sleeve. Positioning marks the distance away from steel bar end for half of the steel sleeve length.
2.2.5 check extrusion equipment is normal, and pressure testing, must conform to the requirements before operation.
3 operation process
3.1 process:
Steel sleeve, reinforced extrusion parts inspection, cleaning, rectification and reinforcement end crimping mark - >
The reinforced insert steel sleeve - extrusion - check acceptance
3.2 bar should be in accordance with the requirements of tag to insert the steel sleeve, to ensure that the joint length, in case of air pressure. Be connected steel axis and axis of steel sleeve should be kept the same axis, prevent eccentricity and bending.
3.3 hang up balancer and pressure in pressure tapping clamp, then good, oil tubing, ultra-high pressure pump starting, adjust good pressure relay the required oil pressure, and then open the press die card board, remove the lower die, inserted the extrusion machine frame opening squeezed ribbed steel bar connection, set back to the lower die, lock, card board pressure clamp under the balance force of balancer, required pressure welding on the steel sleeve tag, the reversing valve control extruder for extrusion. After the pressure to open the lock of card board, remove the lower die, exit the extruding machine, complete extrusion construction.
3.4 extrusion, the pressure clamp pressure meet on the sleeve of indentation marks, and perpendicular to the cross rib is pressed steel. Extrusion from sleeve Central Line by way to the end, the pressure such as phi 32 the reinforced every six creasing, final inspection indentation. Minimum diameter and total indentation width must be in accordance with regulations, as shown in figure 4-35.
Figure 4-35
3.5 in order to reduce the high altitude and speed up the construction progress, can be on the ground first half pressure joint, pressure at the end of a working in the construction of the steel sleeve insert steel reserve, according to the technological requirements extrusion at the other end.
4 quality standards
4.1 ensure projects:
4.4.1 the variety and quality of steel must comply with the design requirements and the provisions of the relevant standards.
Inspection method: inspect the factory certificate and test report.
4.1.2 material, mechanical properties of steel sleeve must comply with the provisions of the standard of steel sleeve, the surface can not have defects such as cracks, fold.
Inspection method: inspect the factory qualified certificate.
4.1.3 extrusion joint strength testing must be qualified. 500 the same specification and same steel joints for crimping process completed a batch of, and not more than three floors with batch of joint distribution, still for a group of less than 500, a random sample of three specimens for tensile strength test, and each layer is not less than 1, tensile strength were pressure welding shall be not less than 1.05 times that of steel tensile strength standard values when one of the specimens does not comply with the requirements, shall be carried out to extract (6) specimen double second-round exam, there is still a second-round exam results specimen is unqualified, the number of joint as nonconforming product.
Inspection method: check test report.
4.2 the basic items:
2 joint appearance quality should be based on the introspection individually 10% joint by layer. Indentation can not have sag, splitting, bending joint shall not be greater than 4 °, reinforced insert steel sleeve length must conform to the rules. If do not conform to the regulations, should remove the joint pressure again.
Inspection methods: observation or check with your ruler.
4.2.2 reinforced joint indentation depth should be compacted. The overpressure should be removed to squeeze. Steel sleeve the minimum diameter and the total width of indentation, should comply with the steel sleeve supply manufacturers provide technical requirements.
Inspection methods: observation and check with your ruler.
5 finished product protection
5.1 on the surface of the precast good connector to use stow-wood pad, points specification packed neatly.
5.2 the sleeve can not have mortar and other sundry.
5.3 in the high altitude of the assembly, the extrusion to build good temporary shelf, shall be stamped on connectors.
6 should pay attention to quality problems
6.1 carefully check the quality of the steel sleeve, materials do not conform to the requirements, without leaving the factory quality certificate, and the appearance quality not qualified steel sleeve, shall not be used.
6.2 to pay attention to the length of reinforced insert steel sleeve, carefully check the reinforcement of tag line, from the air.
6.3 strictly control its pressure extrusion, carefully check the indentation depth, the depth is not enough to fill pressure, super deep to remove joint to reconnect.
7 quality records
This technology standard should have the following quality records:
7.1 steel factory quality certificate or test report.
7.2 steel mechanical performance test report.
7.3 the steel sleeve qualifier.
7.4 joint strength test report.
1 scope
The technology standard is applicable to industrial and civil buildings and structures of reinforced concrete structures in the 20 ~ 40 mm diameter ribbed Ⅱ ~ Ⅲ level radial extrusion bar connection construction.
2 construction preparation
2.1 material and main equipments:
2.1.1 reinforced level, diameter (l8 ~ 40 mm) must comply with the design requirements and national standard, should have the factory quality certificate and retest report. Imported steel need to squeeze connection type inspection, conform to the requirements of the performance after use.
2.1.2 steel sleeve material is low carbon killed steel, its mechanical properties should meet the requirements. Ⅱ reinforced with sleeve yield strength sigma level s 205 n/p was; Tensile strength of sigma b = n / 335 ~ 520 was, elongation sigma s 20% or higher. Ⅲ reinforced with sleeve sigma level 230 or higher n/s was, sigma b = n / 390 ~ 520 was, sigma s 20% or higher. Difference is greater than 5 mm in diameter, with variable cross-section steel sleeve. G18 sleeve specifications, the G20, G22, G25, G28 and G32, G36, G40, transfering the sleeve should be the factory certificate, partial acceptance.
2.1.3 main machine has: ultra-high pressure pump station, tubing, pressure pliers, steel bar extrusion molding, hanging car, balancer, angular grinding wheel, delimit symbol tool and check the creasing the caliper tool such as card board.
Note: ribbed steel bar extrusion connection is insert need to connect two reinforced steel sleeve, using the clamp pressure along the radial compression steel sleeve, to produce plastic deformation, steel sleeve and connected by the deformation after reinforcement in close combination with the overall connection methods.
2.2 operation conditions:
2.2.2 for extrusion of joint operations personnel must be trained, and the related certificates until they have passed the examinations.
2.2.2 remove steel sleeve and reinforced extrusion parts of tarnishing, mortar and other sundry.
2.2.3 reinforced with steel sleeve try to cover, such as steel bar has a horseshoe, flash, bending or large longitudinal size, should be corrected or by hand wheel grinding, with welding cutting large part is prohibited.
2.2.4 reinforced end should be positioning mark and check mark, to ensure that the steel into the length of the sleeve. Positioning marks the distance away from steel bar end for half of the steel sleeve length.
2.2.5 check extrusion equipment is normal, and pressure testing, must conform to the requirements before operation.
3 operation process
3.1 process:
Steel sleeve, reinforced extrusion parts inspection, cleaning, rectification and reinforcement end crimping mark - >
The reinforced insert steel sleeve - extrusion - check acceptance
3.2 bar should be in accordance with the requirements of tag to insert the steel sleeve, to ensure that the joint length, in case of air pressure. Be connected steel axis and axis of steel sleeve should be kept the same axis, prevent eccentricity and bending.
3.3 hang up balancer and pressure in pressure tapping clamp, then good, oil tubing, ultra-high pressure pump starting, adjust good pressure relay the required oil pressure, and then open the press die card board, remove the lower die, inserted the extrusion machine frame opening squeezed ribbed steel bar connection, set back to the lower die, lock, card board pressure clamp under the balance force of balancer, required pressure welding on the steel sleeve tag, the reversing valve control extruder for extrusion. After the pressure to open the lock of card board, remove the lower die, exit the extruding machine, complete extrusion construction.
3.4 extrusion, the pressure clamp pressure meet on the sleeve of indentation marks, and perpendicular to the cross rib is pressed steel. Extrusion from sleeve Central Line by way to the end, the pressure such as phi 32 the reinforced every six creasing, final inspection indentation. Minimum diameter and total indentation width must be in accordance with regulations, as shown in figure 4-35.
Figure 4-35
3.5 in order to reduce the high altitude and speed up the construction progress, can be on the ground first half pressure joint, pressure at the end of a working in the construction of the steel sleeve insert steel reserve, according to the technological requirements extrusion at the other end.
4 quality standards
4.1 ensure projects:
4.4.1 the variety and quality of steel must comply with the design requirements and the provisions of the relevant standards.
Inspection method: inspect the factory certificate and test report.
4.1.2 material, mechanical properties of steel sleeve must comply with the provisions of the standard of steel sleeve, the surface can not have defects such as cracks, fold.
Inspection method: inspect the factory qualified certificate.
4.1.3 extrusion joint strength testing must be qualified. 500 the same specification and same steel joints for crimping process completed a batch of, and not more than three floors with batch of joint distribution, still for a group of less than 500, a random sample of three specimens for tensile strength test, and each layer is not less than 1, tensile strength were pressure welding shall be not less than 1.05 times that of steel tensile strength standard values when one of the specimens does not comply with the requirements, shall be carried out to extract (6) specimen double second-round exam, there is still a second-round exam results specimen is unqualified, the number of joint as nonconforming product.
Inspection method: check test report.
4.2 the basic items:
2 joint appearance quality should be based on the introspection individually 10% joint by layer. Indentation can not have sag, splitting, bending joint shall not be greater than 4 °, reinforced insert steel sleeve length must conform to the rules. If do not conform to the regulations, should remove the joint pressure again.
Inspection methods: observation or check with your ruler.
4.2.2 reinforced joint indentation depth should be compacted. The overpressure should be removed to squeeze. Steel sleeve the minimum diameter and the total width of indentation, should comply with the steel sleeve supply manufacturers provide technical requirements.
Inspection methods: observation and check with your ruler.
5 finished product protection
5.1 on the surface of the precast good connector to use stow-wood pad, points specification packed neatly.
5.2 the sleeve can not have mortar and other sundry.
5.3 in the high altitude of the assembly, the extrusion to build good temporary shelf, shall be stamped on connectors.
6 should pay attention to quality problems
6.1 carefully check the quality of the steel sleeve, materials do not conform to the requirements, without leaving the factory quality certificate, and the appearance quality not qualified steel sleeve, shall not be used.
6.2 to pay attention to the length of reinforced insert steel sleeve, carefully check the reinforcement of tag line, from the air.
6.3 strictly control its pressure extrusion, carefully check the indentation depth, the depth is not enough to fill pressure, super deep to remove joint to reconnect.
7 quality records
This technology standard should have the following quality records:
7.1 steel factory quality certificate or test report.
7.2 steel mechanical performance test report.
7.3 the steel sleeve qualifier.
7.4 joint strength test report.
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