1 scope
The technology is applicable to outer mold,
outside the brick mold, complete casting formwork structures such as wall
reinforcement project.
2 construction preparation
2.1 materials and equipment:
2.1.1 forming steel or mesh: according to
design drawings and specifications, forming steel or spot welding mesh in
advance.
2.1.2 reinforcement and support bars:
double steel mesh while bound between two pieces of steel reinforcement and
support bars, above and below to fix the distance between the bars. See Figure
4-8 (a), (b). Tie bar as shown in Figure 4-8 (a) as shown, and l is the
distance between the two networks, lashing vertical and horizontal spacing
shall not exceed 700mm. But this form of tie bar to pull not only play a
supporting role. In order to ensure correct location wall double-layer tablet,
preferably using ladder support bar, as shown in Figure 4-8 (b). Ladder support
bar is made of two vertical bars (vertical bars with diameter and height of the
wall) and horizontal ribs welded ladder, tied to the wall between the two rows
of steel plays a supporting role, spacing about 1200mm. H is the vertical
height of the wall in the picture, h for the transverse reinforcement of wall
space, and c equal to the wall thickness minus the protective layer of
concrete.
2.1.3 wire: use of 20~22 wire (wire) or
galvanized iron wire (wire).
2.1.4 control mortar for concrete pads,
plastic card.
2.1.5 tools: steel lashing hooks, crowbars,
steel panels, racks, trolleys, wire brushes, chalks, rulers, etc.
Figure 4-8
(A) tie bar; (b) the ladder support bar
2.2 operating conditions
2.2.1 checking steel factory certification,
the required mechanical properties of the second interview, special
circumstances such as when the brittle fracture occurred during processing, the
need for chemical testing; mesh processing factory certificate, bars should be
no old rust and oil.
2.2.2 reinforcement or spot welding mesh
should be stacked at the specified position in the construction plans, network
chip while standing with stand, flat pad should be flat, wood, hoisting should
use netting installed.
2.2.3 when steel surfaces such as rust,
clean prior to binding, rust severely eroded sections of steel shall not be
used.
2.2.4 checking the geometry of the mesh
sizes, specifications, quantity and spot welding quality, qualified before the
use.
2.2.5 brick mold projects must be built up
within exterior walls.
2.2.6 binding reinforcement location should
be cleaned up.
2.2.7 elastic walls and entrance location
line, the loose concrete and reserved bar tick cut clean.
3 operational processes
3.l shear wall with steel binding:
3.1.1 technological process:
Modifications reserved lap bars tied tied
transverse reinforcement →
→ → tied Stud
reinforcement or support bars
3.1.2 the wall leave steel bar
straightening and straightening out, and clean up the surface of mortar and
other debris. First State 2~4 vertical bar and mark the cross bars logo, and on
the lower and chest tied to two cross bars at a fixed location, and mark logo
on the cross bars and tied the remaining vertical bar, and tied the remaining
cross bars.
3.1.3 between double rows of steel tie bar,
tie bar diameter not less than 6, spaced not more than 600mm, shear walls
strengthened parts of lacing at the bottom should be properly encrypted. Keep
the distance of two rows of bars, should adopt binding positioning the ladder
support bar, space 1000~1200mm.
3.2 lashing precast shear wall meshes
3.2.1 process
Repair reserve lap bars fixed binding root
reinforcement mesh →
→ temporary → reinforced → tied to Windows and doors tie lacing or support bars
3.2.2 wall reserved for steel bar
straightening and straightening out, and clean up the debris on the surface.
Press print screen in place, mesh set up temporary fixed support using wood
after prison. And lap steel lashing by roots, were tied at the ends overlapped parts
of the Centre and 3 buckle. Both jambs reinforcing bar binding requirements
location accurately. Such as doors and Windows entrance reserved for
reinforcement displacement, should be made into a lamp bracket bending (1:6) so
that the reinforced door hole location meets the requirements of drawings.
3.3 reinforcement of shear wall lap lap of
horizontal reinforcement detailing in the wall as shown in Figure 4-9. Vertical
distribution in the wall bar, when the level of seismic shear walls and all
parts I and II strengthening parts of the seismic shear walls, reinforced
joints should be staggered, every time you connect to does not exceed the
number of steel 50%. Other steel shear walls can be lapping at the same site.
Lap length comply with design requirements, such as when there is no
requirement, shall satisfy the provisions of table 4-8. Method of vertical
reinforcement in the wall as shown in Figure 4-10.
Figure 4-9
Figure 4-10
Tensile steel banding lap length table 4-8
Concrete strength
C20 C25 C30
Grade ⅰ reinforcement 1 35d
(30D) 35d (30D) 35d (30D)
2 grade steel (Crescent-shaped) 45d 40D 35d
3 grade ⅲ steel bar
(Crescent-shaped) 55d 50d 45d
Note: l. When level ⅰ and ⅱ steel bar
d>25mm, whose lap length can be increased according to the number in the
table 5d.
2. when the rebar diameter ≤ 25mm, the
tensile reinforcement, lap length reduced by values in the table 5d.
3. figures in parentheses lap length of
welded mesh.
3.4 scissors the anchoring wall bar
3.4.1 shear walls with anchorage according
to the design requirements of the horizontal steel bars in construction. Dark
posts or add bars, as described in Figure 4-11 (a), (b).
Figure 4-11
BW-cutting width; la-anchorage length
3.4.2 horizontal reinforcement of shear
walls in "small" Byte and lashing of anchorage of corner node, as
described in Figure 4-12, 4-13.
图4-12 图4-13
3.4.3 the coupling beam of shear wall
length of horizontal steel bar into the wall e ' must not be smaller than the
design requirements, as described in Figure 4-14 (a), (b).
3.4.4 shear-wall connecting beam along the
beam length of hoop structures to meet the design requirements, on the top
floor of a building even within the length of the steel beams into the wall,
spacing should be no less than 150mrn construction of stirrup, as described in
Figure 4-15.
3.4.5 wall opening reinforcing steel
banding around, the anchorage length shall conform to the design requirements.
3.5 reinforcement of shear wall with
precast wall panel connections: install wall panel in place, this layer shear
wall column insert external wall of prefabricated vertical reinforcement plate
steel rings, shaft reinforcement insert rings shall not be less than 3 wall
panel and tie firmly. Refer to figure 4-16.
3.6 out of shear walls with brick wall
connection: when tied up within the walls, first reserved for exterior wall φ 6
tie bar straightening out, and then within the walls overlap tied, as described
in Figure 4-17 (a), (b).
3.7 all casting wall reinforcement
connection binding construct, refer to figure 4-18.
3.8 fixed: template after the closing, to
trim the wall bars protruding, and tied up a temporary horizontal bars fixed
the spacing out of the bar (left rib spacing). Wall concrete special care when
rebar, pouring out, immediately out of the bar (left bar) for finishing.
4 quality criteria
4.1 project:
4.1.1 varieties and properties of steel,
electrode grades, performance and joint use of steel sheet and steel must
comply with the design requirements and the provisions of the relevant
standard.
4.1.2 reinforced with granule and Flake old
rust, rust steel pits after, according to the original specifications is
strictly prohibited. Steel surfaces should be kept clean.
4.l.3 bar sizes, shapes, sizes, quantity,
the anchorage length, connector set, you must meet the requirements of
specification for design and construction.
4.1.4 results of mechanical properties test
of welded joints, welding code requirements must be met.
4.2 Basic project:
4.2.1 steel mesh frame and tie missing
clasp, tie loose quantity does not exceed 10% of buckle, and should not be set.
4.2.2 reinforcement mesh leakage welding,
welding does not exceed 2% of the welding points, and should not be set.
4.2.3 hook toward the right. Lashing
fittings shall conform to the provisions of the code, where each joint of the
lap length is not less than the specified value.
4.2.4 number of Stirrups, hook angle and
straight length should comply with the design requirements and the provisions
of the code.
4.2.5 steel spot welding molten metal at the
point where even, no defects such as cracks, holes and burned. Solder
indentation depth in accordance with provisions of the reinforcing bar welding
procedures.
Welding: no transverse cracks and burns,
uniform welding package joint bending, not more than 4 ° axis displacement is
not greater than 0.1d and less than 2mm.
Arc-welded weld surface, no dents, welding
tumor, crack, blowhole, slag and undercuts, bent connector is not more than 4 °
axis displacement is not greater than 0.1d and less than 3mm, width not less
than 0.1d, the length is not less than 0.5d.
Allowable deviation, see table 4-9
Reinforcement and embedded parts tolerance
table 4-9
Project tolerance (mm) test method
1 Web length, width of ± 10 ' check
Welding ± 10
Lashing ± 20
Distance ± 10
Distance ± 5
Welding ± 10
Lashing ± 20
Center line 5
High levels of differential +3-0
Mechanical reinforcement protection layer
6-foot check
5 finished product protection
5.1 collision embedded parts is strictly
prohibited when binding reinforcement, such as touch design location should be
fixed firmly.
5.2 assurance embedded conduit location
accurately, such as when a conflict occurs, vertical bars along a plane can be
bent around, transverse reinforcement bending, bypass the buried piping. But
make sure that the thickness of the protective layer is strictly prohibited any
cut steel.
5.3 template Panel brush isolated agent,
non-polluting steel.
5.4 the types of operators are not allowed
to any pedal step on the steel, snapping and cutting steel.
6 quality problems to be noticed
6.1 horizontal position, spacing does not
meet the requirements: wall binding reinforcement should take Gordon or a
simple scaffold to prevent horizontal displacement.
6.2 wall protruding lower vertical
reinforcement with steel and does not meet the requirements: binding should
first lower wall out of steel bar straightening and straightening out, then
tying or welding. Reinforcement displacement of the lower reach out when the
consent of the design process.
6.3 jambs rib dimensions do not meet the
requirements: prior to binding adjustment based on where the hole edge
stiffener, lashing the stiffener should wait for alignment.
6.4 level anchorage of shear wall length
does not meet the requirements: studying the drawings. Right around the corner,
cross point, wall end, steel anchor beams parts should comply with the design
requirements.
7 quality records
This standard shall meet the following
quality records:
Steel quality certificate or test report
7.1.
7.2 mechanical properties of steel test
reports.
7.3 import steel chemical composition and
solderability test report the test report. Domestic steel processing, poor
performance or occurrence of brittle fracture, welding and mechanical
properties significantly abnormal, chemical composition inspection report.
7.4 welded test report.
7.5 welding electrode and flux certificate.
7.6 forming mesh factory certificate.
7.7 bars covert acceptance record.
7.8 steel bar sub-item project quality
inspection and evaluation of information.
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