Precast wall panel installation
1 scope
This technology is applicable within the
outer foam prefabricated wall panel installation process.
2 construction preparation
2.1 materials and equipment:
2.1.1 wall panels: enter after checking the
model, size and appearance, the design requirements. Waterproof horizontal
Chamber, vertical cavity structure intact. Members should have a factory
certificate.
2.1.2 the joint waterproofing and
insulation materials: plastic (thick 1.5~2mm), felt, polystyrene.
2.1.3 other materials: cement, sand,
welding electrodes, steel bar, steel plate, 107 rubber, waterproof coating and
caulk.
2.1.4 main tools: wire rope clamp, clasp,
crowbars, plate blocks, temporary fixation clamps and wire, and so on.
2.2 operating conditions:
2.2.1 familiar with design drawings, master
siding type, location, size, elevation and construction practices, and so on.
2.2.2 checking anyway, waterproof wall
panel cavity should be intact, if any damage should be repaired, repaired base
should be clean, with about 107 adhesive cement mortar (cement 15%) patch.
2.2.3 anchorage reinforcement of wall
panels on either side of the cut out ring, adjust straight, pick your cut
should not damage the concrete near the ring, and vertical cavity coating
waterproofing coating for waterproofing.
2.2.4 check the installation location wall
panel lines and elevations, finish shall be checked.
2.2.5 installing the wall formwork and
platform card shelf.
2.2.6 checking first floor reinforced
concrete retaining water and reserved location.
3 operational processes
3.1 process:
Screed → wall panels in
place temporary fixed wall panel →
→ insert linoleum and polystyrene, plastic →
Inserting reinforcement → Groove
welded joints, pouring the concrete → bottom twisting
hydraulic cement mortar for exterior wall →
Remove the external wall temporary support
3.2 touch screed: by pressing the elevation
of good mortar screed, which reached a certain strength, wall panels in place
before pouring plain cement slurry to make strict combination, elevation
accuracy. If screed, you should start leveling with a little way, to adjust
wall panel in place, dry wall panel below the slot twist plug hydraulic cement
mortar, but twist compact.
3.3 wall panels in place: wall panels
before lifting, check rings, clasp pins tight, lifted to the installation
location, to find a vertical position, then slowly falling in place. Exterior
wall panels in place, wall outside the sideline, outside walls straight,
perpendicular to the walls, cracks, tongue and Groove joints may not be
misplaced, prevent Yan Ping cavity. Elevations must be accurate to prevent the
shed above the water table. Is strictly prohibited in the water, parts of the
water move the wall panels, and protection during the entire installation
process wall panel edges and waterproof structure. Drop is wanting wall panel
installation should be positioned, on line and on foot. When you install the
first layer of wall panels, should pay particular attention to quality, making
it a benchmark of the floors above.
3.4 temporary fixed wall panel: wall panels
in place, with TURNBUCKLE or temporary fixing clamps to siding grapple with the
large template. Corner two wall panels adjacent to the gable Board should fix
with each other, grappling the rear hook. Each vertical applying Theodolites to
check it again.
3.5 is linoleum, benzene planks, plastic:
linoleum and polystyrene articles first pre glued together into waterproof
cavity should be inserted in the end, around tight, not bulge or fracture.
Concrete should be checked before the impaction is intact, insert plastic
article, practices should comply with the design requirements of the upper and
lower ends, strip width should be appropriate.
3.6 inserting node structure reinforcement:
side wall panel out of the steel ring coincides with the horizontal wall
reinforcement rings, the vertical reinforcement is inserted into overlapping
rings of steel bars. Each piece of wall panels and at the junction of the wall
should be at least insert 3 rings and solid banding (acceptance should be
hidden).
3.7 keyway welded steel reinforced
concrete: when cast in the wall with flat modular construction, exterior wall
panels in place, keyways should be installed with welded dowels; such as the
use of drum formwork construction, welding immediately after the removal. Seam
thickness and length according to the design requirements, while the design when
there is no weld thickness 6mm, length of 90mm. Upper and lower reinforcement
when the dislocation should straighten out the lap weld again, rebar lap length
is not sufficient, plus added help steel or steel plate thickness of 8mm
welding. Steel single weld length is not enough to both sides. Check the
welding quality, handle hidden procedures, before pouring the concrete. Before
lifting a layer of wall panels should be finished pouring concrete keyway,
keyway must be vibration compacting.
3.8 outer wall panel bottom twisting
hydraulic cement mortar: keyways steel welding, should clean up the bottom of
the siding, water moist, lateral with linoleum block, prevent clogging of the
cavity, and then twisted stiff mortar and compact twist plug.
3.9 remove temporary support wall panel:
wall panel exterior wall corners, must be wall-column concrete strength is
above 4MPa, removable temporary fixed facilities.
4 quality criteria
4.1 project:
4.1.1 lifting strength of concrete it is
necessary to meet the requirements of specification for design and
construction.
4.1.2 anchorage reinforcement component
type, location, node must meet the design requirements, and no deformation
damage occurred.
4.1.3 concrete joints keyway must be
accurate measurement, concrete compacting, careful conservation, which must
meet the design requirements or provisions of the code.
4.1.4 waterproof wall panel structures must
meet the design requirements.
4.2 basic item: keyways splices in the
joints, seams, should comply with the design requirements and the provisions of
the code. Weld length to meet the requirements and smooth surface, no dents,
welding tumor, crack, blowhole, slag and the undercut.
4.3 allowable deviation, as shown in table
4-40.
Table 4-40
Project tolerance (mm) method
1 axis displacement offset 5-foot check
Storey ± 10
Full height ± 10
Wall plate 5 2m supporting plate check
Full-height 1/1000 full height vertical 3
and not more than 20 with a theodolite or wait for check
Gables on each caster 2 with 2m supporting
plate check
Height difference ± 5 using a ruler and a
wedge-shaped feeler Gage check
Vertical-5 2m supporting plate check
5 finished product protection
5.1 after entering wall panel, should be
placed in the plug.
5.2 transport, during the lifting
operation, avoid damage the waterproof wall panel structures, such as a shed,
retaining water, cavities and other damage should be repaired before use.
5.3 wall panels in place as accurately as
possible, and protect good mortar screed. When installing to prevent pulling
hard to pry.
5.4 when the siding is installed, no
collision has been installed floor.
6 quality problems to be noticed
6.1 exterior wall waterproofing
construction damage: before lifting should check for damaged parts should be
trimmed in a timely manner, install skid for the avoiding while leveraging the
easily damaged parts.
Wall Panel seams should be even, and uneven
affects cavity waterproof.
6.2 wrong upper and lower wall plate: wall
panels in place, certain lines in place, mainly outside edges to ensure
exterior smooth wall panel.
6.3-bus bars do not meet requirements: If
the wallboard walls within steel rings and rings does not match, vertical
reinforcement insert rings less than three groups. Therefore, steel operations
shall be responsible to ensure joint compliance.
6.4 keyways are not timely: wall panel
after installation, should be immediately welding and pouring concrete.
7 quality records
This process shall meet the following
quality records:
7.1 wall panel factory certificate.
7.2 welding certificate.
7.3 cement factory certificate and retest
report.
7.4 test reports for sand and stone.
7.5 concrete testing reports.
7.6 hoisting records, inspection records.
7.7 component quality inspection and
assessment of installation project information.
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