1, template flat-fell seam tightly, do not leak slurry, flat-fell seam greater than 5mm closed measures should be taken to close;
2, the old wooden surface should be cleaned before installation.
Second, the material preparation:
1. Template: 15mm thick.
2. Wood cube: 50x 100mm, planed flat and double-sided to make uniform specifications.
3. Shelf pipes: 6m, 4m, 3m,1.5m.
4. Other materials: Type 3 fastener (bolt hole 17.5mm), matching nut, φ 14 bolt, cross fastener and rotary fastener. Release agent, sponge strip, etc.
Third, the machine preparation:
Planer, planer, bench drill, circular saw, wire pendant, wrench, hammer, portable toolbox, etc.
Four, operating conditions:
1, according to the engineering structure design, the template design should ensure the strength, stiffness and stability.
2, wall steel binding, water and electricity box, embedded parts, doors and windows hole embedded, check the protective layer thickness should meet the requirements, the concealed engineering acceptance formalities.
3, in order to prevent the template mouth leak slurry, before installing the template with mortar screed-coat, but the screed-coat can't into the wall.
4, before installing the template, the template board should be clean, brush isolation agent (after the template is in place, it is not allowed to brush isolation agent, to prevent pollution of steel bar and concrete contact surface, brush evenly, and do not miss the brush).
5, axis, line of control, and the supervision review.
6, the wall reinforcement has passed the acceptance, and has completed the hidden inspection procedures.
7. The steel bar project and formwork project have completed the handover inspection procedures.
8, materials, machines and personnel are ready.
Verb (abbreviation of verb) construction technology;
1, beam template:
Technological process: formwork support at the bottom of beam → binding of beam reinforcement → formwork support at the side of beam → formwork support at the top plate → self-inspection → acceptance.
(1) Before shuttering the beam and slab, find a representative construction site as a model, and familiarize each operator with it through the beam and slab model.
Master the construction scheme and technical disclosure content, truly achieve technical disclosure to the end, and avoid rework and material waste.
(2) Scaffolding shall be set up at the bottom of the beam, with the vertical pole spacing of 800~ 1000mm and the underlay length of 400mm and 50× 100mm, which must be uniform and straight. Before installation, hang the elevation control line at the bottom of the beam. For beams larger than 4m, the height of the horizontal bar shall be adjusted according to the requirements of 2‰ bulging at the bottom of the beam, fixed with fasteners and vertical bars, and then installed on the top horizontal bar.
(3) Laying the beam bottom formwork, supporting the top with adjustable steel in the middle of the beam bottom, with the adjustable screw extending out of the free end of the steel pipe no more than 300 m m, temporarily fixing the beam bottom formwork with pipe clamp after adjustment, binding steel bars at the beam bottom after inspection, and going through the hidden inspection formalities after acceptance. Clean up the sundries, install the beam side formwork, wrap the beam bottom formwork with the beam side formwork, and reinforce the beam with the short frame pipe and steel pipe diagonal brace connected with the small bar. For beams with a height greater than 700mm, a long back stare blankly is set in the middle of the beam and fastened in place with bolts, and the spacing is not greater than 600 mm.
(4) Stay straight when the beam is flowing, and check whether the section size of the beam meets the requirements, whether the connection with the adjacent column formwork is tight and consistent with the beam formwork.
Close to the column template, the column of the beam template is provided with scissors to ensure the stability of the beam support.
3, the roof template
Erection of support system → installation of primary and secondary keels → laying of panels → checking and correcting the flatness of epithelial elevation of templates → flat-fell seam treatment of panels → cleaning panels and brushing release agent → template preview.
(1) The spacing between the vertical poles of the roof supporting scaffold is 800 ~1000 mm, the spacing between the horizontal poles is 1500mm, the sweeping pole is 200mm from the ground, and bracing is provided.
(2) Laying primary and secondary keels: The main keels are made of φ48×3.5mm steel pipes, and the main keels are connected with vertical rods through fasteners. Then according to the elevation control line of the roof, the height of the main keel is adjusted by pulling wires. Roof formwork with a span of more than 4m shall be arched in the middle of the span according to 1.5/65438+300mm. Construction method: find the highest point of arching in the middle of the span, pull the rope at the edge to find the slope, adjust the height of the column to meet the requirements of arching, and then lay the secondary keel on the main keel, with the secondary keel of 50× 65438.
(3) Laying wooden panels: First, lay nail plates from the edge of the beam, and the joints between the edge of the plate and the beam should be straight without unevenness. Nails with lengths of Ф 3.5 and 40-50 mm should be fixed on the secondary keel. The number of nails used in the whole wood-plastic board is 7-9 on the long side and 4-5 on the short side, and the nail holes on the panel should be determined according to the actual situation.
④ Inspection and correction of template epithelial elevation flatness: according to the control line of roof elevation, hang lines at the four corners to check the elevation and flatness of the board surface. When shuttering, flat-fell seam should be located on the secondary keel as far as possible, which is convenient for plate fixation and leveling. Stick sponge strips at the contact points between the plate and the beam and the wall to prevent slurry leakage.
⑤ Flat-fell seam treatment of roof panel: the roof panel adopts hard flat-fell seam.
4, stair template
Stair formwork consists of platform, stair beam and stair slab. Stair shuttering should be done in advance, and the horizontal distance, height and steps should be calculated. The width of the stair side should be equal to the thickness of the stairs and the height of the steps. The anti-triangular wood is nailed to the square wood by several triangular wood blocks, and the triangular wood blocks are straight.
The angle and side length are equal to the height and width of the step respectively, and each ladder section should be equipped with at least one anti-triangle wood, which should be hung with horizontal stare blankly and vertical wood. During construction, the stair beam and platform should be supported first, and then the inclined bottom plate, step triangle template and step plate should be supported. The starting point and step of template support should be reserved with different paint thickness dimensions. Support should be stable and firm, and steel pipe bending should be provided with support perpendicular to flight.
5, balcony and humanly scaled template
Balcony formwork adopts wooden formwork, and side formwork is lower than platform formwork according to design. Mark the stairs according to the shape for the first time, and pile them separately after formwork removal to ensure that the formwork arrangement is not chaotic, resulting in material waste.
At the window of the external wall, the large formwork of the external wall is completely configured according to the concrete wall, and the opening of the internal formwork is divided into four formwork configurations: left, right and upper. When dismantling humanly scaled formwork, the windowsill formwork should be dismantled first, and then the formwork on both sides and corner formwork should be dismantled after temporary support is added. After the concrete strength reaches the specified strength, the upper and lower formwork can be removed.
Six, template construction points:
1, the quality of formwork production directly affects the quality of concrete. In this project, nine plywood formwork is used for formwork configuration, and wooden formwork is used locally to ensure the verticality control and geometric size of the structure. Manufacturing and installation deviation control should be carried out according to standards.
2, template installation must correctly control the axis position and section size, template flat-fell seam to closely. When flat-fell seam is ≥ 1mm, it shall be pasted with double-sided adhesive tape or scotch tape. The bent support system under the beam can only be dismantled after the concrete strength of the beam reaches 100%. In addition, in order to ensure that the beam is not skewed, the middle of the beam bottom formwork is arched by 3%.
3. The formwork support system must be horizontal and vertical, the supporting points must be firm, the fastener bolts must be tightened, and the formwork shall be installed in strict accordance with the Pareto Diagram. Before pouring concrete, assign special personnel to check the formwork supports, bolts, column hoops, fasteners and other fasteners, and make timely rectification when problems are found.
4. Holes, built-in parts, etc. It should be kept correctly. It is recommended to number the sample drawings to prevent misplacement and leakage. The installation should be firm, and the template can be closed only after it is confirmed.
5, platform template support must be in strict accordance with the requirements of design drawings, consistent from top to bottom, consistent in and out, the carpenter builder must do layer upon layer review.
6. The formwork removal shall comply with the "Code for Construction Acceptance" and the strength requirements specified in the design. Without the consent of the relevant technical departments, the formwork shall not be removed at will. Increase the on-site concrete formwork removal test blocks, and conduct pressure test when necessary to ensure quality and safety.
7, template turnover when using should often repair, brush release agent, keep the surface smooth and clean.
8. It is forbidden to connect the template with an outer layer.
Seven, template removal operation and key points:
1. Before formwork removal, the formwork removal strength of concrete should be met. When the concrete strength can ensure that its surface and edges and corners are not damaged by formwork removal, the side formwork of beams and columns can be removed.
2, template demolition template demolition should pay attention to pay attention to pay attention to pay attention to skills, not hard pry or too hard, should not form impact load on the floor, must be removed step by step in order, it is forbidden to hard pry, knock, brutal demolition.
3, before the erection of formwork support system, verify whether the axis and elevation of each part are accurate.
4. Before the bottom beam slab bottom formwork is dismantled, the formwork can only be dismantled after the concrete strength meets the specification requirements (curing is not less than 14 days).
5. Generally, dismantle the formwork first, then dismantle the formwork, dismantle the non-bearing part first, and then dismantle the bearing part, so as not to damage the component or formwork;
6. Demolition of multi-storey floor formwork columns: When the upper formwork is pouring concrete, the lower columns shall not be demolished, only part of the lower columns shall be demolished. Beams with a span of 4m or more should have columns, and the spacing should not be greater than 3 m. The formwork column of the next layer should be completely removed after the concrete of this layer reaches the design strength.
7. When dismantling the formwork, do not stand directly below the dismantled formwork or on the dismantled formwork or bracket;
8, remove the template, shall not throw, high-altitude demoulding to light up. Wooden formwork should be nailed in time and piled up according to specifications.
9, the demolition of the structure, should be after the concrete reaches the design strength grade, allowed to bear all the calculated load;
10, component demoulding should pay attention to make each part stress evenly, without damaging the component corners or forming cracks.
Eight, template installation and template removal quality requirements:
1, axis position allowable deviation is 5 mm;
2. The allowable deviation of bottom die elevation is 5 mm;
3. The allowable deviation of section size is+4 ~-5 mm;
4. The allowable deviation of height verticality is 6mm (height ≤ 5m); The allowable deviation of height verticality is 8mm (height >; 5m)；
5, adjacent template height difference allowable deviation is 2 mm;
6. The allowable deviation of surface flatness is 5mm. ..
7, template and its support must have enough strength, stiffness and stability.
8, template joints should not leak slurry, template and concrete contact surface is clean and coated with isolation agent, it is forbidden to isolate agent pollution of steel.
9, template in the process of use must strengthen management, specifications piled up, strengthen maintenance, clean up in time.
10, allowable deviation items:
Allowable deviation and inspection method of template installation
Nine, finished product protection measures:
1, when lifting the formwork, handle it with care, and collision is not allowed to prevent the formwork from deforming.
2, shall not be used when ripping hammer hard hit or crowbar hard pry, so as not to damage the concrete surface and stare blankly Angle.
X. Safety precautions:
1, steel fasteners, type 3 fasteners, bolts and other small materials must be bagged and taken away from the working face, and shall not be thrown from top to bottom.
2, steel pipe and template hoisting wire rope must be clamped.
3. Smoking is strictly prohibited on the construction site, and no drunken operation is allowed.
4, enter the construction site must wear safety protection articles correctly.
XI。 Environmental protection measures:
1, release agent must be stored in the specified location and listed.
2, release agent coating shall not be too thick, so as to avoid environmental pollution caused by falling off.
3. The waste roller brush and waste cotton silk with release agent must be recycled to the designated garbage pool in time, and no littering is allowed.
4. It is forbidden to use chainsaws, repair steel formwork and other strong noise operations at night, and it is forbidden to talk loudly.
5, the construction site materials must be neatly packed, operation surface must be cleaned up in time, do live at the foot of the qing dynasty.
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