Taper thread reinforcing steel joint
The technology standard is applicable to industrial and civil building cast-in-place reinforced concrete structure in hot rolling Ⅱ 16 ~ 40 mm in diameter, Ⅲ level at the same level of the same diameter or different diameter steel bar connection. The connected bar diameter difference is not more than 9 mm straight.
Using taper thread reinforced joint shall be subject to consent by the designer.
2 construction preparation
2.1 material and main equipments:
2.1.1 reinforced: reinforced level, diameter must comply with the design requirements, have the factory certificate and retest report.
2.1.2 connection set shall meet the following requirements:
2.1.2.1 have obvious of the specifications of the tag (e.g., 32 or 32).
2.1.2.2 cone hole with plastic cover gasket seal.
2.1.2.3 or reducing connection with diameter size in table 4-25 prescribed scope.
Connected set of size table of table 4-25
Connected set of specifications marked outside diameter not less than the length of not less than (mm) (mm)
16, 16, 25-65-0.5-0.5
18, 18, 28-75-0.5-0.5
20, 20, 30-85-0.5-0.5
22, 22, 32-95-0.5-0.5
25, 25 to 35-95-0.5-0.5
28, 28, 39-105-0.5-0.5
32, 44-115-0.5-0.5
36, 36, 48-125-0.5-0.5
40, 40 52-135-0.5-0.5
2.1.2.4 taper thread plug gauge screw-in connection set after the connection of the big end edge should be within the scope of taper thread plug gauge heel of gap (figure 4-36).
Figure 4-36
2.1.2.5 product certificate.
2.1.2.6 connected set of classification packaging storage, shall not be confused and rust.
2.1.3 main machines:
2.1.3.1 reinforced set of silk machine: models for SZ 50 a, or other can bearing diameter 16 mm and above Ⅱ, Ⅲ steel set of silk machine.
2.1.3.2 gauge, gauge, including tooth shape gauge, gauge and taper thread plug gauge.
Tooth shape gauge is used to check the rebar connection the taper thread profile processing quality of gauge.
Gauge is used to check the rebar connection the taper thread gauge the diameter of the small end.
Taper thread plug gauge is used to check the processing quality of taper thread connection of the gauge.
2.1.3.3 torque wrench, torque wrench must be approved by the metrological management department, has a licence for manufacturing measuring instruments production factory production of products. Torque wrench should be periodically with the approval of the metrological management department of the production of torque meter calibration, verification qualified rear must use. Verification period once every half a year, and new construction projects must first for verification before use.
2.2 operation conditions:
2.2.1 operators (including the set of silk workers) must through special training, and passed the examination the rear can mount guard.
2.2.2 joint position should comply with the rules.
2.2.3 familiar with drawings, technical disclosure.
3 operation process
3.1 process:
Reinforced monomer material - steel sleeve - joint specimen under test to rebar connection, quality inspection
3.2 steel reinforcing steel cutter blanking available or grinding wheel saws, not use gas cutting. Reinforced material, requirements of vertical reinforced end face and reinforced, end shall not be bent, can not appear horseshoe.
3.3 steel set:
3.3.1 set of silk machine must use water-soluble cutting fluid cooling and lubrication, and shall not use the oil lubrication or without lubricant set of silk.
3.3.2 rainfall distribution on 10-12 steel cover silk quality must use the tooth shape gauge with calipers, reinforcement of tooth shape must be in conformity with the tooth shape rules, its small end diameter must be marked on the gauge within the permissible error, taper thread thread is full of teeth number shall not be less than specified value of table 4-26.
Taper thread thread is full of teeth number of table 4-26
Rebar diameter (mm) complete tooth number of not less than (a)
16 ~ 18 5
20 ~ 22 July
From 25 to 28 August
32 10
36 11
40 12
3.3.3 in operator self-inspection, on the basis of qualitative check member must be 3% every batch of sampling, and not less than three, and fill out inspection records (see table 1).
3.3.4 inspection qualified steel taper thread, shall be immediately screw plastic protective cap on its end, on the other side in a specified torque value, with a torque wrench to tighten the connection.
3.4 joint monomer specimen test:
3.4.1 track number of specimens: connectors, each specification per 300 for one batch, less than 300 also as a group, each group of three specimens.
3.4.2 specimen making: before construction, from the construction site engineering with several root steel 300 mm long, single joint specimen length not less than 600 mm. One head into taper thread, use the tooth shape gauge and check the taper thread gauge wire processing quality of the head (FIG. 4-37). When the tooth shape and tooth shape rules, small end diameter in the gauge within permissible error, taper thread thread head considered as qualified products, and then with a taper thread plug gauge. Check the processing quality of connected sets of the same specification. When the connection of big end edge within the scope of taper thread plug gauge main gap, connection set for the product.
Figure 4-37
Rule 3.4.3 joint torque value should comply with the specified value in table 4-27.
The joint of the tightening torque value table 4-27
Steel bar diameter (16 mm) 18 20 to 22 from 25 to 28 32 36 ~ 40
Tightening torque (N, m) 118 145 177 216 275 314 177
3.4.4 tensile test specimens shall meet the following requirements:
3.4.4.1 yield strength measured value is not less than steel yield strength standard values.
3.4.4.2 tensile strength with steel yield strength standard values measured values, and the ratio of not less than 1.35 (reducing reinforced joint will be subject to path reinforcement strength).
If there is one specimen to reach the required value, should take double specimen test again. When all the specimen after qualified, can connect the construction. If there is still 1 root specimen, determine the number of fitting is unqualified, are not allowed to be used.
3.4.4.3 fill in joint tensile test report (see table 2).
3.5 steel connections:
3.5.1 track of connected set of specifications and reinforced specifications must be consistent.
3.5.2 before connection should be reinforced taper thread and examine whether the connected set of taper thread is in good condition. Steel taper thread head if discover sundry or corrosion, steel wire brush to clean.
3.5.3 connect with a set of steel twist to the waiting on steel, and then press the torque values given in table 4-27, with a torque wrench tight joint. When they hear torque wrench thrum "card tower", namely to screw down the value of joint. The operation of the reinforcing bar connection as shown in figure 4-38 (a), (b), (c). Connection, the horizontal reinforcing steel bar must first will steel flat is turned into by hand, then according to this operation.
Figure 4-38
(a) the same diameter and reducing joint connection; (b) a one-way adjustable joint connection; (c) two-way adjustable joint connection
3.5.4 connection through joint must be marked with paint, prevent leakage twist.
3.6 quality inspection: the production of steel bar connection, operators should carefully inspect the appearance quality of joint, exposed screw bolt shall not exceed 1 complete. If discover exposed thread is more than a complete, should be promptly eliminate heavy twist or find reasons. Not eliminate, should report relevant technical personnel to deal with.
Full-time quality inspectors to check the appearance quality of joint, and joint torque, torque wrench sampling and fill the sampling record (see table 3). When found unqualified, should handle in time.
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 quality certificate and test report.
4.1.2 connected set of specifications and quality must conform to the requirements.
Methods: to check the product certificate.
The strength of the 4.1.3 connectors must be qualified.
Joint each specification, every 300 as a group, less than 300 also as a group, each batch do three root specimen tensile test.
Inspection method: inspect joint tensile test report.
4.1.4 joint torque value sampling must be qualified.
Beam and column components: each component to sample a joint.
Board, wall, foundation slab: a floor every 100 joint as a batch, less than 100 also as a group, each batch sample three joints.
Random joint torque values must all qualified. If there is one component of a joint can not meet the prescribed tightening torque values, are all the components of the joint must be individually twist to the specified torque values.
Sampling inspection method: inspect taper thread steel joint construction records.
4.1.5 of the specifications of the steel bar, the position of the joint, the same section with joint reinforced area percentage, must comply with the design requirements and norms.
Methods: to observe the or feet quantity check.
4.2 the basic items:
Exposed thread taper thread joint shall not be more than 1 complete clasp, to reinforce or otherwise to tighten the joint.
Inspection method: to observe the examination.
5 finished product protection
Pay attention to connect set and have set the protection of the wire steel wire clasp, shall not damage the thread, thread may not stick with water and mud.
6 should pay attention to quality problems
6.1 must separate construction use and test with torque wrench, cannot mix, to guarantee the accuracy of the torque test value.
6.2 steel bar in front of the set of silk, must be reinforced specifications and appearance quality inspection. Steel bar end bending is found, you must first straightening processing. Reinforced rib edge dimensions such as super bad, should first will end edge rib smashed before use.
6.3 steel wire, adjust the position of the set rule should be taken before operation, and steel according to specifications with corresponding processing guide sleeve. For large diameter steel bar to divide second turning to the specified size, to ensure the accuracy of thread, comb knife to avoid damage.
6.4 to individual by the joint inspection is unqualified, can adopt arc welding method of fillet weld reinforcement, but its height and thickness of the weld shall be jointly set by construction, design and supervision personnel, personnel who hold welders test certificate to welding.
6.5 taper thread joint construction should be contracted by the specialized construction team has the qualification for the construction.
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 connected set of certificate of approval.
7.4 joint strength inspection report.
7.5 joint torque value sampling record.
Taper thread reinforcing steel joint tensile test report
Project name: structural layers: the component types: schedule 1
Reinforced cross sectional yield limit yield strength, yield strength ultimate strength measured values, the measured values
Specification area of tension tensile strength limit yield strength standard values flexor strength standard values
(mm) (was) (kN) (kN) (kN/was) (kN/was) (x) (x)
Experiment 1. The steel yield strength measured value of not less than steel yield strength standard values.
Conclusion 2. The tensile strength of reinforced joint measured values and standard steel yield strength ratio of not less than 1.35 times.
Test unit: the head: the operator: test date:
Steel taper thread processing inspection records
Schedule 2
Name of engineering structure layers
Processing quantity sampling quantity component types
Serial number specification of thread form small end diameter steel full thread inspection conclusion
To prepare
1. According to the processing of each batch steel taper thread of 3% sampling inspection;
2. The thread profile and the tooth shape gauge teeth shape anastomosis for qualified tick, otherwise hit "x";
3. Small taper thread end diameter of the gauge tolerance within the scope of qualified "tick", otherwise hit "x";
4. All kinds of steel taper thread thread count, complete at least qualified for next table to play "");
16 ~ 18 phi phi phi phi of 20 ~ 22 from 25 to 28 32 phi phi phi 36 and 40
Note: the button button 5, 7, 8 of 10 button 11 to 12
5. Taper thread thread head has an unqualified is nonconforming, this batch of wire head to review them one by one.
Inspection unit: inspector signature:
Inspection date: technical director;
Taper thread reinforcing steel joint construction checking records
Schedule 3
Project name to check the date
Hierarchical component type joint position
Specified torque value (kg - m) test torque value
Construction torque values (kg - m) (kg - m)
Test conclusion: qualified quality, unqualified x. Inspector:
Sampling unit: technical director:
The technology standard is applicable to industrial and civil building cast-in-place reinforced concrete structure in hot rolling Ⅱ 16 ~ 40 mm in diameter, Ⅲ level at the same level of the same diameter or different diameter steel bar connection. The connected bar diameter difference is not more than 9 mm straight.
Using taper thread reinforced joint shall be subject to consent by the designer.
2 construction preparation
2.1 material and main equipments:
2.1.1 reinforced: reinforced level, diameter must comply with the design requirements, have the factory certificate and retest report.
2.1.2 connection set shall meet the following requirements:
2.1.2.1 have obvious of the specifications of the tag (e.g., 32 or 32).
2.1.2.2 cone hole with plastic cover gasket seal.
2.1.2.3 or reducing connection with diameter size in table 4-25 prescribed scope.
Connected set of size table of table 4-25
Connected set of specifications marked outside diameter not less than the length of not less than (mm) (mm)
16, 16, 25-65-0.5-0.5
18, 18, 28-75-0.5-0.5
20, 20, 30-85-0.5-0.5
22, 22, 32-95-0.5-0.5
25, 25 to 35-95-0.5-0.5
28, 28, 39-105-0.5-0.5
32, 44-115-0.5-0.5
36, 36, 48-125-0.5-0.5
40, 40 52-135-0.5-0.5
2.1.2.4 taper thread plug gauge screw-in connection set after the connection of the big end edge should be within the scope of taper thread plug gauge heel of gap (figure 4-36).
Figure 4-36
2.1.2.5 product certificate.
2.1.2.6 connected set of classification packaging storage, shall not be confused and rust.
2.1.3 main machines:
2.1.3.1 reinforced set of silk machine: models for SZ 50 a, or other can bearing diameter 16 mm and above Ⅱ, Ⅲ steel set of silk machine.
2.1.3.2 gauge, gauge, including tooth shape gauge, gauge and taper thread plug gauge.
Tooth shape gauge is used to check the rebar connection the taper thread profile processing quality of gauge.
Gauge is used to check the rebar connection the taper thread gauge the diameter of the small end.
Taper thread plug gauge is used to check the processing quality of taper thread connection of the gauge.
2.1.3.3 torque wrench, torque wrench must be approved by the metrological management department, has a licence for manufacturing measuring instruments production factory production of products. Torque wrench should be periodically with the approval of the metrological management department of the production of torque meter calibration, verification qualified rear must use. Verification period once every half a year, and new construction projects must first for verification before use.
2.2 operation conditions:
2.2.1 operators (including the set of silk workers) must through special training, and passed the examination the rear can mount guard.
2.2.2 joint position should comply with the rules.
2.2.3 familiar with drawings, technical disclosure.
3 operation process
3.1 process:
Reinforced monomer material - steel sleeve - joint specimen under test to rebar connection, quality inspection
3.2 steel reinforcing steel cutter blanking available or grinding wheel saws, not use gas cutting. Reinforced material, requirements of vertical reinforced end face and reinforced, end shall not be bent, can not appear horseshoe.
3.3 steel set:
3.3.1 set of silk machine must use water-soluble cutting fluid cooling and lubrication, and shall not use the oil lubrication or without lubricant set of silk.
3.3.2 rainfall distribution on 10-12 steel cover silk quality must use the tooth shape gauge with calipers, reinforcement of tooth shape must be in conformity with the tooth shape rules, its small end diameter must be marked on the gauge within the permissible error, taper thread thread is full of teeth number shall not be less than specified value of table 4-26.
Taper thread thread is full of teeth number of table 4-26
Rebar diameter (mm) complete tooth number of not less than (a)
16 ~ 18 5
20 ~ 22 July
From 25 to 28 August
32 10
36 11
40 12
3.3.3 in operator self-inspection, on the basis of qualitative check member must be 3% every batch of sampling, and not less than three, and fill out inspection records (see table 1).
3.3.4 inspection qualified steel taper thread, shall be immediately screw plastic protective cap on its end, on the other side in a specified torque value, with a torque wrench to tighten the connection.
3.4 joint monomer specimen test:
3.4.1 track number of specimens: connectors, each specification per 300 for one batch, less than 300 also as a group, each group of three specimens.
3.4.2 specimen making: before construction, from the construction site engineering with several root steel 300 mm long, single joint specimen length not less than 600 mm. One head into taper thread, use the tooth shape gauge and check the taper thread gauge wire processing quality of the head (FIG. 4-37). When the tooth shape and tooth shape rules, small end diameter in the gauge within permissible error, taper thread thread head considered as qualified products, and then with a taper thread plug gauge. Check the processing quality of connected sets of the same specification. When the connection of big end edge within the scope of taper thread plug gauge main gap, connection set for the product.
Figure 4-37
Rule 3.4.3 joint torque value should comply with the specified value in table 4-27.
The joint of the tightening torque value table 4-27
Steel bar diameter (16 mm) 18 20 to 22 from 25 to 28 32 36 ~ 40
Tightening torque (N, m) 118 145 177 216 275 314 177
3.4.4 tensile test specimens shall meet the following requirements:
3.4.4.1 yield strength measured value is not less than steel yield strength standard values.
3.4.4.2 tensile strength with steel yield strength standard values measured values, and the ratio of not less than 1.35 (reducing reinforced joint will be subject to path reinforcement strength).
If there is one specimen to reach the required value, should take double specimen test again. When all the specimen after qualified, can connect the construction. If there is still 1 root specimen, determine the number of fitting is unqualified, are not allowed to be used.
3.4.4.3 fill in joint tensile test report (see table 2).
3.5 steel connections:
3.5.1 track of connected set of specifications and reinforced specifications must be consistent.
3.5.2 before connection should be reinforced taper thread and examine whether the connected set of taper thread is in good condition. Steel taper thread head if discover sundry or corrosion, steel wire brush to clean.
3.5.3 connect with a set of steel twist to the waiting on steel, and then press the torque values given in table 4-27, with a torque wrench tight joint. When they hear torque wrench thrum "card tower", namely to screw down the value of joint. The operation of the reinforcing bar connection as shown in figure 4-38 (a), (b), (c). Connection, the horizontal reinforcing steel bar must first will steel flat is turned into by hand, then according to this operation.
Figure 4-38
(a) the same diameter and reducing joint connection; (b) a one-way adjustable joint connection; (c) two-way adjustable joint connection
3.5.4 connection through joint must be marked with paint, prevent leakage twist.
3.6 quality inspection: the production of steel bar connection, operators should carefully inspect the appearance quality of joint, exposed screw bolt shall not exceed 1 complete. If discover exposed thread is more than a complete, should be promptly eliminate heavy twist or find reasons. Not eliminate, should report relevant technical personnel to deal with.
Full-time quality inspectors to check the appearance quality of joint, and joint torque, torque wrench sampling and fill the sampling record (see table 3). When found unqualified, should handle in time.
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 quality certificate and test report.
4.1.2 connected set of specifications and quality must conform to the requirements.
Methods: to check the product certificate.
The strength of the 4.1.3 connectors must be qualified.
Joint each specification, every 300 as a group, less than 300 also as a group, each batch do three root specimen tensile test.
Inspection method: inspect joint tensile test report.
4.1.4 joint torque value sampling must be qualified.
Beam and column components: each component to sample a joint.
Board, wall, foundation slab: a floor every 100 joint as a batch, less than 100 also as a group, each batch sample three joints.
Random joint torque values must all qualified. If there is one component of a joint can not meet the prescribed tightening torque values, are all the components of the joint must be individually twist to the specified torque values.
Sampling inspection method: inspect taper thread steel joint construction records.
4.1.5 of the specifications of the steel bar, the position of the joint, the same section with joint reinforced area percentage, must comply with the design requirements and norms.
Methods: to observe the or feet quantity check.
4.2 the basic items:
Exposed thread taper thread joint shall not be more than 1 complete clasp, to reinforce or otherwise to tighten the joint.
Inspection method: to observe the examination.
5 finished product protection
Pay attention to connect set and have set the protection of the wire steel wire clasp, shall not damage the thread, thread may not stick with water and mud.
6 should pay attention to quality problems
6.1 must separate construction use and test with torque wrench, cannot mix, to guarantee the accuracy of the torque test value.
6.2 steel bar in front of the set of silk, must be reinforced specifications and appearance quality inspection. Steel bar end bending is found, you must first straightening processing. Reinforced rib edge dimensions such as super bad, should first will end edge rib smashed before use.
6.3 steel wire, adjust the position of the set rule should be taken before operation, and steel according to specifications with corresponding processing guide sleeve. For large diameter steel bar to divide second turning to the specified size, to ensure the accuracy of thread, comb knife to avoid damage.
6.4 to individual by the joint inspection is unqualified, can adopt arc welding method of fillet weld reinforcement, but its height and thickness of the weld shall be jointly set by construction, design and supervision personnel, personnel who hold welders test certificate to welding.
6.5 taper thread joint construction should be contracted by the specialized construction team has the qualification for the construction.
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 connected set of certificate of approval.
7.4 joint strength inspection report.
7.5 joint torque value sampling record.
Taper thread reinforcing steel joint tensile test report
Project name: structural layers: the component types: schedule 1
Reinforced cross sectional yield limit yield strength, yield strength ultimate strength measured values, the measured values
Specification area of tension tensile strength limit yield strength standard values flexor strength standard values
(mm) (was) (kN) (kN) (kN/was) (kN/was) (x) (x)
Experiment 1. The steel yield strength measured value of not less than steel yield strength standard values.
Conclusion 2. The tensile strength of reinforced joint measured values and standard steel yield strength ratio of not less than 1.35 times.
Test unit: the head: the operator: test date:
Steel taper thread processing inspection records
Schedule 2
Name of engineering structure layers
Processing quantity sampling quantity component types
Serial number specification of thread form small end diameter steel full thread inspection conclusion
To prepare
1. According to the processing of each batch steel taper thread of 3% sampling inspection;
2. The thread profile and the tooth shape gauge teeth shape anastomosis for qualified tick, otherwise hit "x";
3. Small taper thread end diameter of the gauge tolerance within the scope of qualified "tick", otherwise hit "x";
4. All kinds of steel taper thread thread count, complete at least qualified for next table to play "");
16 ~ 18 phi phi phi phi of 20 ~ 22 from 25 to 28 32 phi phi phi 36 and 40
Note: the button button 5, 7, 8 of 10 button 11 to 12
5. Taper thread thread head has an unqualified is nonconforming, this batch of wire head to review them one by one.
Inspection unit: inspector signature:
Inspection date: technical director;
Taper thread reinforcing steel joint construction checking records
Schedule 3
Project name to check the date
Hierarchical component type joint position
Specified torque value (kg - m) test torque value
Construction torque values (kg - m) (kg - m)
Test conclusion: qualified quality, unqualified x. Inspector:
Sampling unit: technical director:
No comments:
Post a Comment