Cone thread splices
This technology is applicable for
industrial and civil reinforced concrete structure in the hot-rolled 16~40mm in
diameter ⅱ, ⅲ sibling of the same diameter or the diameter of the steel
reinforcement connections. The connection diameter of less than 9mm.
Conical thread splices shall be agreed by
the designer.
2 construction preparation
2.1 materials and equipment:
2.1.1 steel: steel grade, diameter must
conform to the design requirements, certificate and retest report of the
factory.
2.1.2 connection shall conform to the
following requirements:
2.1.2.1 clear specification tags (such as
32 or 32).
2.1.2.2 taper bore sealing with plastic
cover.
2.1.2.3 the same diameter or reducing the
connecting sleeve size ranges specified in the table 4-25.
Connected set of dimension tables tables
4-25
Connect sets of specifications marked
diameter not less than (mm) length of not less than (mm)
16, 16 25-0.5 65-0.5
18, 18 28-0.5 75-0.5
20, 20 30-0.5 85-0.5
22, 22 32-0.5 95-0.5
25, 25 35-0.5 95-0.5
28, 28 39-0.5 105-0.5
32, 32 44-0.5 115-0.5
36, 36 48-0.5 125-0.5
40, 40 52-0.5 135-0.5
2.1.2.4 after taper threaded plug is
screwed into the connecting sleeve and the big end of the connecting sleeve
edges shall, within the scope of taper threaded plug big gaps (Figure 4-36).
Figure 4-36
2.1.2.5 product certification.
2.1.2.6 connection set should be sorted
packages stored shall not be confused with rust.
2.1.3 equipment:
2.1.3.1 rebar Threading machine: model SZ
150 a, or other 16mm and above ⅱ and ⅲ class reinforced pipe threader.
2.1.3.2 gauge: gauge including tooth-shaped
gauges, gauges and taper thread gauge.
Tooth shape is used to check rebar
connection end of the taper thread gauges for tooth profile machining quality.
Calipers are used to check rebar connection
end of the tapered thread small end diameter gauges.
Taper thread gauge is used to check the
gauges for taper thread connection quality.
2.1.3.3 torque wrench: torque wrench must
be approved by the administrative departments for measurement, measuring
instruments manufacturing license production products. Regularly approved by
the administrative departments for measurement of torque wrench torque detector
calibration, registered after passing permitted use. Inspection period once
every six months, and new construction projects must be conducted verification
can be used.
2.2 operating conditions:
2.2.1 workers (including workers) must be
specially trained and qualified before they can post.
2.2.2 fitting location should be in order.
2.2.3 familiar with the drawings, technical
clarification.
3 operational processes
3.1 process:
Reinforced cutting → reinforced → connectors
single specimen test → reinforced → quality control
3.2 steel cutting saw steel cutter or
grinding wheel, not use gas cutting material. Under the reinforcement material,
requires end with bars perpendicular to the axis, end shall not be bent, shall
not appear a Horseshoe.
3.3 reinforcement Threading:
3.3.1 pipe threader water-soluble cutting
coolant must be used shall not be lubricated with oil or without lubricant.
3.3.2 quality of steel wire must be in
shape with the teeth check with gauges, reinforced tooth must coincide with the
teeth in shape, its small end diameter must be within the calipers out
tolerances, taper thread nipple full table 4-26 of the teeth must not be less
than the specified value.
Taper thread nipple full table 4-26
Bar diameter (mm) complete number is not
less than (a)
16~18 5
20~22 7
25~28 8
32 10
36 11
40 12
3.3.3 in workers to operate the self test
based on the inspector must each batch of samples 3% and not less than 3 and
complete inspection records (see table 1).
3.3.4 checking conformity of conical
thread, should immediately end twist plastic protective cap, according to the
prescribed torque value at the other end, with a torque wrench to tighten the
connection.
3.4 joint single specimen test:
3.4.1 specimen size: each type connector,
each 300 for a group, fewer than 300, do 3 specimens per batch.
3.4.2 specimens: prior to construction,
from the construction site to intercept 300mm a number of steel bars for
engineering use, monomer length of sample not less than 600mm joints. Be set
into a tapered thread, with the teeth in shape and gauges to check the
machining of the tapered thread head (Figure 4-37). When a tooth shape tooth
shape closely, small end diameter within the calipers out tolerances, then determines
tapered thread head is a qualified product, then taper thread Plug gauges.
Check the connections of the same specification of processing quality. When the
big end of the connecting sleeve edge on the taper threaded plug big gaps in
range, connecting sleeve for qualified products.
Figure 4-37
3.4.3 joints the tightening torque value
should be consistent with table 4-27 values.
Joints the tightening torque values table
4-27
Bar diameter (mm) 16 18 20 22 25~28 32
36~40
Tightening torque (N • m) 118 145 177 216
275 314 343
3.4.4 tensile test specimens shall meet the
following requirements:
3.4.4.1 the yield strength not less than
reinforced yield strength standard values of the measured values.
3.4.4.2 tensile strength measured with
reinforced yield strength ratio of standard value of not less than 1.35
(different diameter steel expansion joints subject to the path strength of
reinforcing bar).
If 1 specimens do not meet these
requirements, should take double specimen tests. When all the specimens after
passing before connect construction. If there is still 1 specimens fail, then
the whole batch of connectors are not qualified, are not allowed to use.
3.4.4.3 fill tensile test report (see table
2).
3.5 steel connections:
3.5.1 connection specifications bar
specifications must be consistent.
3.5.2 connection should be checked before
conical thread and taper thread of connection is intact. Conical threaded head
found debris or corrosion, use wire brush to clean.
3.5.3 with sleeves of steel and screwed to
the steel, and then according to the torque value specified in table 4-27,
torque wrench to tighten the connector. When you hear the issue of torque
wrench "Kata" noise, reaches joint tightening values. Rebar connecting
operation see Figure 4-38 (a), (b), (c) as shown. When connecting to a
horizontal steel rods, bars must first be Toppin was screwed on by hand, then
operate according to the diagram.
Figure 4-38
(A) connected with the drive and reducers;
(b) one-way adjustable joints; (c) bi-directional adjustable connectors
3.5.4 connecting joints must immediately
mark the spot with paint to prevent leaking screw.
3.6 quality checks: in the production of
rebar connection, operators should carefully examine the appearance quality of
the joint, exposed screw should not exceed 1 full deduction. If exposed screw
more than 1 complete chain, should be screwed or find reason to remove. Not
eliminated, should report on the technical staff to handle it.
Full-time quality inspectors to check the
appearance of the joint quality and tightening torque of the torque wrench
sampling joint, and fill in the sampling record (see schedule 3). Found not
eligible should be promptly dealt with.
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: quality inspection
certificate and test report.
4.1.2 connection specifications and quality
must meet the requirements.
Inspection method: check the product
certificate.
4.1.3 connector must be qualified.
Each type connector, each 300 for a group,
fewer than 300, do 3 specimens for tensile testing of each batch.
Inspection method: check tensile tests
report.
4.1.4 connection tightening torque values
of the samples must be qualified.
Beams and columns: sampling 1 connector per
Member.
Boards, walls, Foundation: a floor for
every 100 connectors, fewer than 100 as a group of each sampling the 3
connectors.
Check the joints the tightening torque
values must be fully qualified. If there is 1 member 1 connectors do not meet
prescribed tightening torque value, then the component connectors must be
screwed to the prescribed torque value individually.
Inspection method: check conical twisted
splices for construction inspection records.
4.1.5 reinforcing specifications, joint
location, within the same section of a joint bar area percentage, you must meet
the requirements of specification for design and construction.
Inspection method: observation or standard
checks.
4.2 Basic project:
Taper threaded joints exposed threads may
not exceed 1 full deduction, you should re-tighten the connector or to
reinforce.
Inspection method: Visual check.
5 finished product protection
Attention to the connecting sleeve and
reinforced thread protection is allowed to damage threads, threads not having
water on the mud and dirt.
6 quality problems to be noticed
6.1 must be separated from the construction
and testing of torque spanner, can't be mixed to ensure accurate torque test
values.
6.2 bars in front of the wire, steel
specifications and appearance must be checked. Find end bending, straightening
process must be conducted. Reinforced edge ribs dimension such as variance,
first end rib flat can be used.
6.3 steel wire, should adjust foot location
before operations, and according to the specifications reinforced with
corresponding processing guide sleeve. For large diameter bars to turn to the
required size, to ensure the accuracy of thread, avoiding damage to the cutter.
6.4 individual test failed joints,
reinforced by ARC weld fillet can be used, but their height and thickness up to
construction, design and project management staff to identify, welder
examination certificate holders to weld.
6.5 taper threaded joints in construction
should be certified by qualified specialized construction team contract of
construction.
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 connection certificate.
7.4 the joint strength inspection report.
7.5 joint sampling of tightening torque
values recorded.
Conical twisted splices with tensile test
report
Project name: layer structure: member type:
Schedule 1
Transection of reinforced yield strength
yield strength yield strength measured strength limits measured values
Specifications size tensile yield strength
tensile strength limit standard values bending strength standard values
(Mm) (mm2) (kN) (kN) (kN/mm2) (kN/mm2)
(times) (times)
Test 1. Reinforced yield strength not less
than reinforced yield strength standard values of the measured values.
Conclusion 2. Joints of steel bar tensile
strength measured with reinforced yield strength ratio of standard value of not
less than 1.35 times.
Experimental unit: head of test: test: test
date:
Conical thread inspection records
Schedule 2
Project name structure layers
Process number sampling number of member
types
Ordinal spec twisted tooth small end
diameter complete thread test conclusion
Preparation of
1.3% of the process each batch of taper
thread of reinforcing bar sampling;
2. thread profile and tooth shape
tooth-shaped anastomosis for qualified to play "√", or
"x";
3. thread small end diameter qualified to
play in the kaguiyun range "√", or "x";
4. specifications taper thread of
reinforcing bar minimum number of full thread, qualifying the next table "√";
φ16~φ18 φ20~φ22 φ25~φ28 φ32 φ36 φ40
Note: 5 button 7 button 8 button 10 button
11 button 12 button.
Because of the war, many people become homeless. I can't do it well. Please help me.my PayPal is xhhnet@163.com.
No comments:
Post a Comment