This scheme is the construction scheme of the formwork support system with an erection height of less than 8m and an erection span of less than 18m, and the formwork support system and reinforcement scheme with an erection height of 8m and above, an erection span of 18m and above, a total construction load of 15kn m2 and above, and a concentrated line load of 20kn m and above are also see the special construction plan of tall formwork.
Considering the characteristics of the short construction period and small number of floors of this project, in order to ensure the progress of the project, our formwork engineering materials are put into a one-time investment, and all materials and tools are not turnover.
The engineering quantity of this project template is large. The selection of formwork and support is detailed in Table 65-1.
Table 65-1 Table of selection forms of main component formwork and supports.
1) Formwork construction process.
Template construction process, see Figure 65-1.
2) Design and construction of basement foundation and floor formwork.
1) Basement foundation: independent column base and strip foundation are made of brick tire mold, and are built with lime sand bricks and 1:2 cement mortar.
2) basement floor: the outside of the basement floor adopts brick tire mold masonry, and the tire mold masonry method is the same as the foundation cushion cap.
3) The basement floor is high and low, and the hanging mold is used, when the height of the hanging mold is less than 10m, no seams, concrete one-time pouring, when the height of the hanging die is greater than 1When 0m, a construction joint is set at 200mm above the low elevation of the bottom plate, and a waterproof steel plate of -400*3 is set at the construction joint, and the concrete above the construction joint is poured and formed at one time.
3) Sump and elevator foundation pit formwork erection.
The foundation bottom sump and elevator foundation pit formwork of this project are supported by box-type formwork, and are supported with steel pipes, 50 100mm wooden keels, adjustable bearings and 15 mm thick laminated wood plywood. Before the template is erected, a plurality of steel bar heads are spot welded as cushion blocks under the bottom plate, and then the panel is placed close to the steel bar cushion block, and the exhaust hole of 40mm 40mm and the vibrating hole of 150mm 150mm are left on the bottom template surface, the longitudinal and horizontal spacing is 800mm, and two layers of steel wire mesh are arranged below the template of the exhaust hole position to prevent concrete from overflowing. After the formwork is erected, the scaffold board is laid and an appropriate amount of weight is pressed to prevent the formwork from floating. The schematic diagram of formwork support is shown in Figure 65-2.
4) Design and construction of structural column formwork.
The frame column formwork of this project is made of 15mm thick mirror-coated wood plywood, assembled at the construction site of the woodworking processing shed, with a vertical inner flute of 50mm and 100mm wooden fangs, and a spacing of 200mm;Horizontal outer flute double 483×3.0 steel pipe, spacing 450mm, reinforced with 16 pairs of tension bolts (16 water-stopping bolts are used for basement exterior frame columns), pitch of tension bolts is 450mm 450mm, and the bottom row is 450mm 200mm;Bolt spacing in the direction of column cross-sectional width B direction and height H direction is 450mm (the horizontal direction of the tension bolt of the cross-sectional dimension of 700mm is not less than 2, the column tension bolt of more than 2m is not less than 3, and the column cross-sectional size is less than 700 can be provided with a tension bolt). The corners are made of wooden slats to ensure that the corners are straight and beautiful. Diagonal support, using 483×3.0. Steel pipe oblique reinforcement (try to take 45°).
1) see Figure 6 for the support of the frame column formwork of this project5-3.
2) Special-shaped column template.
The special-shaped column template support of the project is shown in Figure 65-4.
5) Design and construction of wall formwork.
The structural wall formwork of this project is made of 15mm thick mirror-coated wood plywood, with a vertical inner flute of 50mm and 100mm wood fangs, and a spacing of 200mmHorizontal outer flute double 483×3.0 steel pipes, spacing 450mm, reinforced with 16 pair of bolts (16 water-stopping bolts on the outer wall of the basement). Reinforcement is made by punching a knot through the wall bolt at the double steel pipe and fixing it on the round steel pipe with a "butterfly card" 483×3.0 double steel pipes. The spacing of the tension bolts is 450mm 450mm, and the bottom row is 450mm 200mm;The diagonal brace adopts steel pipe + U-shaped support.
6) Design and construction of structural beam and plate formwork.
1) Beam formwork.
The structural wall formwork of this project is made of 15mm thick mirror-coated wood plywood.
Beam side: inner flute 50mm 100mm wooden fang, vertical, spacing 200mm;Outer flute double 483×3.0 steel pipes, spacing @450mm;When the beam height is 600mm, the beam side mold can not use the tension bolt, only support the horizontal steel pipe top brace of the plate formwork, and at the same time use a part of the short steel pipe diagonal brace. When the beam height is 600mm, the beam side mold is fixed with a tension bolt. Schematic diagram of beam formwork see 65-6。
The bottom surface of the beam: 50mm 100mm wooden fang, vertical, spacing 200mm;Outer flute 483×3.0 steel pipes;The spacing is 900mm along the length of the beam.
2) Floor slab formwork.
The floor slab support of this project mainly adopts fastener type and bowl buckle type formwork scaffolding, the vertical and horizontal spacing of the frame body is 900mm (high formwork 600mm), the step distance is 1200mm, the adjustable upper and lower supports are adopted, and the free end shall not be greater than 300mm. The bottom of the pole pad 10 channel steel (100 48 5..)3) The bottom sweeping rod is 200mm away from the ground. Every 4 spans are provided with longitudinal and transverse scissor supports, and every two steps are provided with transverse scissor supports. After the scaffolding is erected, lay 483. The main keel of the steel pipe, 50mm 100mm wooden square keel, the spacing of the secondary keel is not more than 150 mm, and then the 15mm thick mirror-coated wood plywood is laid, and the mirror-coated multi-layer wood plywood adopts hard joints, and the junction between the multi-layer board and the wall is first glued with sponge strips on the side of the multi-layer board and then close to the wall. The floor slab formwork support is shown in Figure 65-7。
7) Stair formwork design and construction.
The formwork is made of 15mm thick mirror-coated wood plywood and 50mm 80mum wooden fang after on-site lofting, the tread template is prefabricated with wood plywood 50mm wood square, and the stair side mold is assembled with wooden fang and a number of triangular planks with the same geometric size as the step. Because the lifting force of the top template will be generated when pouring concrete, therefore, the tie bolt must be attached during construction, the tread roof and the bottom plate pull the bolt, and the tread roof and the bottom plate are knotted to make its deformation be controlled. The stair formwork is supported as shown in Figure 56-8.
8) Hole formwork support.
The concrete wall door and window opening formwork and reserved opening formwork are made of 12 thick laminated wood plywood and 50 100mm wood square, angle iron and bolts. The size of the shaped steel mold is made according to the thickness of the wall, the height and width of the opening. The displacement of the opening formwork is controlled by the reinforcement at the edge of the opening. If the hole in the middle of the wall is reserved, the hole mold under the hole mold should be drilled to ensure the compactness of the concrete. The schematic diagram of formwork support is shown in Figure 65-9.
1) Preparation before installation.
1) Do a good job of positioning benchmarks.
According to the control axis, use the ink fountain to pop up the columns, walls, structural dimension lines and the central axis of the beams on the structural plate surface.
The elevation control point is marked at 50cm above the vertical reinforcement of the column to control the elevation of the beam and plate formwork.
Set the template positioning datum: cut a certain length of steel bar according to the section size of the component, spot weld it on the main reinforcement (subject to the section of the main reinforcement not burned), and divide the binning according to the center position of the second row of main reinforcement to ensure the accuracy of the position of the reinforcement and the template.
According to the formwork and accessories required for construction, the specifications and quantities shall be counted and inspected one by one, and the parts that have not been repaired shall not be used.
The templates that have passed the inspection should be stacked according to the installation procedures. When overlapping and flattening, skids are added between each layer, and the template is aligned with the skids up and down, and the bottom template is more than 10cm from the ground.
Before the formwork is installed, the technical disclosure is made to the construction team and operatorsBrush the surface of the template with a separator that does not pollute the concrete, and it is strictly forbidden to paint waste engine oil on the template.
2) Do a good job in the maintenance and purchase of construction equipment and auxiliary materials.
2) Column formwork installation.
1) According to the size of the drawing, the column formwork is assembled in pieces, and the column formwork is directly hoisted into place by the tower crane or crane according to the column formwork control line, and the steel pipe is temporarily fixed, the hanging line corrects the verticality and the diagonal of the column top, and finally fastens the column hoop and the tie bolt.
2) The process flow is shown in Figure 65-10.
3) Wall formwork installation.
1) The process flow is shown in Figure 65-11.
2) Precautions for formwork construction.
a) Before pouring concrete, carefully review the position of the formwork, the verticality of the column wall formwork and the elevation of the beam plate, and accurately check whether the position and size of the reserved holes are accurate, whether the formwork support is firm, and whether the joints are tight.
b) the beam and column joint is the difficulty of formwork construction, and the poor treatment will seriously affect the appearance quality of concrete, and the parts that do not conform to the modulus here must be carefully made, fixed firmly, and it is strictly forbidden to put together randomly.
c) All templates should be cleaned and coated with separator before use, and damaged templates must be eliminated.
d) Arrange carpentry to see the mold during concrete construction, and deal with problems in time.
e) Template installation quality requirements.
The allowable deviation and inspection method of template installation and embedded parts and reserved holes are shown in Table 65-2.
Table 65-2 Allowable deviation value of template installation and embedded parts and reserved holes.
4) Beam plate formwork installation.
1) Pop up the beam positioning line according to the axis that pops up on the floor.
2) adjust the elevation of the bracket according to the design elevation, install the beam bottom template and pull the line leveling, when the beam span is 4m, the bottom of the beam in the span is arched according to the design requirements, if the design is not required, the arching height is generally 1--3 of the beam span.
3) The foundation soil or floor under the beam plate must be compacted, and the skids are laid according to the spacing of the steel pipe poles to ensure that the beam is supported on a firm foundation surface. The frame body of the beam part should be provided with longitudinal and horizontal two-way scissor support, and the lower end of the scissor support at the pile foundation cushion cap, independent foundation and ground beam should be held up to the concrete surface.
5) Template installation safety and environmental protection measures.
1) Security measures.
a) The operator of the installation template should wear a safety helmet, and the safety belt should be hung up for high-altitude work.
b) The installation of the formwork should be carried out in order, and the formwork and support system are not fixed, and it is strictly forbidden to use the pull rod to get on and off people.
c) The formwork installation should be carried out on a firm scaffold, if it stops halfway, the pillars and formwork in place should be connected and stable, and should not be placed overhead, so as to prevent falling and injuring people.
d) The wires erected on the formwork and the power tools used should use a low-voltage power supply of 36V.
e) When climbing the operation, the formwork connector must be placed in the box or tool bag, it is strictly forbidden to put it on the formwork or scaffolding, and all kinds of tools such as wrenches must be hung on the body or placed in the tool bag, and shall not be dropped. When stacking formwork on scaffolding or operating table, it should be stacked smoothly according to the regulations to prevent falling off and not overloaded.
f) The installation formwork must have a stable climbing tool or scaffolding, with a height of more than 3At 5m, scaffolding must be erected. The support frame or operating platform for installing the beam formwork and the beam and column joint formwork must be firmly supported. Protective nets should be added to the reserved holes of the formwork, elevator shafts, etc., to prevent people and objects from falling.
g) below the ground formwork, should first check the stability of the soil wall, in case of cracks or earthwork danger, should be eliminated first, before the operation. Within 1m of the upper mouth of the foundation groove, the formwork and support pieces shall not be stacked.
h) When installing wall and column formwork, it should be supported and fixed at any time. Before the fasteners, connectors and supporting parts of the formwork are installed, it is not allowed to stand on the formwork to operate.
i) The support of the wall and column formwork must be firm to ensure the overall stability. The column formwork with a height of more than 4m should be supported or cabled on all sides. When the column formwork exceeds 6m, the group or column formwork is used at the same time, and the inter-column support is set in time to form an overall framework system. Horizontal tie rods should not be nailed to unstable parts such as scaffolding or scaffolding boards to prevent loosening and instability.
2) Environmental protection measures.
a) Attention should be paid to controlling noise pollution during the installation of the formwork.
b) In the process of wood formwork processing, electric saws and electric planers should be used indoors, and attention should be paid to controlling noise.
c) The sawdust and broken wood produced by processing wood formwork should be disposed of in strict accordance with the solid waste disposal procedures to avoid environmental pollution.
d) Prevent leakage when applying the release agent, so as not to pollute the environment.
1) The order of dismantling of the formwork.
The template removal flow chart is shown in Figure 65-12.
2) Concrete strength requirements when removing the formwork.
1) The concrete strength of the non-load-bearing formwork (column, wall formwork) should be dismantled only when its surface and edges and corners are not damaged due to demoulding, and not earlier than two days;The load-bearing formwork should be dismantled when the concrete strength reaches the strength specified in the construction specification, and the concrete strength should be determined according to the strength of the curing test block under the same conditions;Although the strength of demoulding has been reached, part of the support should be retained when the strength is not yet able to bear the upper construction load;Stairwell formwork and supports can only be removed when their strength reaches 100%.
2) Formwork removal safety and environmental protection measures.
1) Security measures.
a) When dismantling the formwork at high altitude, except for the operator, no one shall stand below, and the operator shall wear a safety belt. Around the operation area and at the entrances and exits, special personnel should be responsible for safety inspections. There should be warning signs in the demolition operation area, and irrelevant personnel are strictly prohibited from entering;
b) Scaffolding boards should be erected when removing the mold on the support, and the removed parts and templates should be transported away during the intermittent removal of the mold;
c) When dismantling the outer beam and ring beam formwork of the floor, there should be measures to prevent falling from height and prevent the formwork from turning outward;
d) Remove the support and wooden file, and immediately pull out the nails on it, and stack them neatly to prevent "nails from hurting people";
e) On windy days above level 6, the formwork shall not be dismantled;
f) When dismantling the load-bearing formwork, in order to avoid sudden collapse of the whole block, temporary support should be set up first if necessary, and then disassembled.
Environmental protection measures: a) Attention should be paid to reducing noise when the formwork is removed;
b) The garbage after the formwork is removed should be cleaned up in time and disposed of in strict accordance with the solid waste disposal procedures to avoid polluting the environment.
1.Template material, specification and model.
1) The technical performance must meet the relevant quality standards (through the storage, inspection of the factory certificate and test report of the incoming wood plywood and bamboo plywood).
2) Appearance quality inspection standard (through observation inspection).
There shall be no decay, mildew, or bubbling in any part. There shall be no edge defects and fluffing. The degumming of veneer per square meter is not more than 0001m2。The polluted area per square meter is not more than 0005m2
3) Specification and size standards.
Thickness detection method: use a steel tape measure at 20mm away from the edge of the plate, measure 3 points and 1 point respectively on the long and short sides, and take the average value of 8 points;The difference between each measurement point and the average value is a deviation. Length and width detection method: use a steel tape measure to measure the length and width of each plate at 100mm away from the edge of the plate by 2 points respectively, and take the average value. Diagonal difference detection method: Measure the difference between two diagonals with a steel tape measure. Warpage detection method: measure the diagonal length with a steel ruler, and measure the maximum chord height between the steel ruler and the plate surface with a wedge-shaped feeler gauge (or steel tape measure), and the ratio of the latter to the former is the warpage.
2.Vertical flatness controls.
1) The verticality of the template is strictly controlled, and each template line must be retested before the template is installed in place, and the template can be installed only after it is correct.
2) The formwork is assembled and cooperated, and the foreman and the quality inspector check the verticality of the formwork one by one to ensure that the verticality does not exceed 3mm and the flatness does not exceed 2mm.
3) Before the template is in place, check whether the position and spacing of the top mold stick meet the requirements.
4) After the formwork is erected, pull the horizontal and vertical through lines to ensure that the formwork deformation and running position are easy to observe when the concrete is poured.
5) Carefully check whether the bolts, top braces and diagonal braces are loose.
1.Precision control.
After the concrete pouring of each floor slab is completed, the side beam control line and elastic line are guided according to the floor axis measuring hole, when the template is erected, the control point is led to the template with a laser plumb instrument, and each layer construction section is provided with 4 (3 positioning and 1 review) floor control points that can be seen, and the edge beam accuracy is controlled by leading the floor control line to the operation layer template (template reserved hole) to review the distance beam edge size during the structure construction.
2.Precision control.
This project uses the hanging line pendant method to check the side beam and verticality.
1) The geometry of the pendant should be regular, and the weight should be appropriate (1 3kg). The hanging wire is made of braided and untwisted thin steel wire.
2) When suspension, the upper end should be fixed firmly, and there should be no obstacles in the middle of the line, especially no lateral resistance.
3) When the left and right of the line are less than 3 4mm, the average position is taken, and when the difference between the two average positions is less than 2 3 3mm, the average position is taken as the projection result.
4) Prevent wind and vibration, especially side wind.
5) In the layer-by-layer test, the line should be put once every 3 layers with a wire pendant for verification.
6.5.7.1. The construction process of the formwork support.
6.5.7.2. The order of erection of the support frame.
Base layout put vertical and horizontal sweeping rod from the corner part to both sides of the erection of the bottom pole, the bottom end and the horizontal sweeping rod buckle fixed, the verticality of the pole should be checked before fixing the bottom rod, after each direction is installed with the pole, with the installation of the second layer of horizontal reinforcement rod and the pole buckle fixed, check the pole and the horizontal rod meet the requirements, press 40 60Nm torque with a wrench to tighten the fastener bolt according to the above requirements in turn to extend the erection until the first step of the frame is completed, and then comprehensively check the quality of the frame again, to ensure that the quality requirements of the frame and then carry out the second step of horizontal rod installation....Subsequently, the scissor brace is erected in time according to the erection process.
6.5.7.3. Requirements for the erection of support frames.
1.Horizontal bar setting.
1) at the bottom of the pole from the ground or the floor 200 places along the vertical and horizontal direction according to the program of the longitudinal and horizontal setting sweeping rod, the step distance is 1500.
2) a horizontal rod is added at the bottom of the beam, and a horizontal tie rod should be added between the two horizontal rods at the top step distance;All the ends of the horizontal rods that meet the requirements of the wall columns around the building or the horizontal rods with the structural columns should be connected with the structure to enhance the rigidity of the entire support system.
2.Scissor brace setting.
1) Erection of longitudinal and transverse scissor supports.
Longitudinal and transverse scissor braces are set every 6m intervals, and the width of the scissor braces is 45~6m。The angle between the scissor brace and the ground is between 45 ° and 60 °, because the load at the bottom of the beam is larger, the scissor brace is arranged on both sides of the bottom support of the beam, and the scissor brace should be buckled with the vertical rod at each step.
2) Erection of horizontal scissor support.
The formwork support frame is provided with a horizontal scissor brace at both ends and in the middle along the height direction, and the top and bottom (the setting layer of the sweeping rod) should be provided with a horizontal reinforcing layer. The horizontal reinforcement layer is used as follows: with a horizontal oblique rod"of"The glyph connects the horizontal scissor braces, and the width of the horizontal oblique rod is not less than 3m.
3. The erection of safety protection.
After the frame body is erected, a layer of safety net is laid at the topmost crossbar, and the operating platform with a width of not less than 600mm is laid with scaffold boards on both sides of the frame beam.
4. Other construction requirements of the frame.
1) The rods used in the high support frame of the beam and plate formwork must be qualified national standard products;The tightening torque of each fastener should be controlled, and the fasteners that directly bear the load (such as scissor braces, diagonal braces and vertical rods, etc.) should be checked by a special person to strictly control the tightening torque at 40 60Nm。The bowl buckle used to fix the transverse horizontal rod and longitudinal horizontal rod at the main node must be tightened and then smashed with a hammer.
2) The adjustable base or bottom bracket located at the bottom or top of the upright rod of the formwork support, the design value of the compressive bearing capacity of the adjustable brace should not be less than 40kN, and the thickness of the support plate should not be less than 5mm. The outer diameter of the screw rod shall not be less than 36mm, the extension length shall not exceed 200mm, and the compressive bearing capacity of the jacking shall be the same as that of the base. The distance between the top of the pole and the top crossbar of the bracket should not be greater than 400mm.
3) The length of the pole must be connected by butt, and lap connection is strictly prohibited.
4) Two-way horizontal rods must be set up between the beam support frame and the full hall frame pole according to the step distance to ensure sufficient design rigidity in both directions.
5) The position and placement direction of all square timber must be strictly in accordance with the design, and if there is any adjustment, it should be calculated and submitted for approval.
6) At the junction of the longitudinal and horizontal beams, the vertical rod shall not be reduced due to the meeting of the support frame at the bottom of the beam, and the structural vertical rod shall be appropriately increased according to the specific situation.
7) When the frame body encounters the elevation change of the façade structure, attention should be paid to coordinating the relationship between the step height and the structural elevation, so as to ensure that the step height is not exceeded, and the variable step distance setting of one to two small steps can be used to adjust.
5 Principles of full hall arrangement:
1) The intersection area of the primary and secondary beams is an erection area, and the distance between each area and the main and secondary beams is shown in the above figure, and the distance between the vertical rods is @900 (the distance between the vertical rods is shown in the above figure);
2) the spacing of the main beam, the bottom of the secondary beam is 1 2 of the spacing of the erection rod of the full hall, and 1 support pole is arranged at the bottom of the beam when the beam width is 400mm;When the width of the 400mm beam is 600mm, 2 vertical rods are arranged, and when the beam width is 600mm, three supporting vertical rods are arranged at the bottom of the beam;
3) The longitudinal and transverse horizontal crossbar step distance is 1500mm;
4) The sweeping rod is 200mm from the ground, the top free end is 500mm, and the jack screw extension length is 200mm
5) the frame beam intersection area is a span, and continuous scissor braces are arranged around it, and the vertical rod at the bottom of the beam is also provided with scissor braces;The horizontal scissor brace is provided with upper, middle and lower three channels along the vertical direction;
6) the frame body and the frame column that has been poured are made into the form of the frame body holding column;
6.5.7.4. Formwork installation construction process.
6.5.7.5. Template installation.
Installation of 1-column formwork.
According to the control line of the pop-up column, after the steel bar is concealed and accepted, the column mold can be sealed, and the debris in the column can be cleaned up before installation. When sealing the column formwork, the beam-column joint formwork can be installed together. In order to ensure the construction quality of concrete, the column hoop is installed and used with the steel pipe hoop with the wall screw, and when the column section is greater than 600, a wall screw is arranged in the middle, and the screw spacing is @ 450. In order to be able to reuse the wall screw, the wall screw jacket PVC hard plastic pipe, the length of which is the same as the wall thickness of the column or beam, so that the wall screw is isolated from the concrete. The wall screw must be installed on the same horizontal or vertical line, but in order to prevent factors affecting the quality such as slippage caused by the large number of turnovers, each wall screw should be carefully inspected before use, and it is strictly forbidden to use damaged screws. The corners of the column are blocked with wooden slats to make up for sponge strips to ensure that the corners are straight and beautiful. Pull through lines are used between columns to check and accept. The column mold is covered with a wooden flute to reduce slurry leakage.
2. Shear wall formwork installation.
Before the formwork is used, the surface of the formwork is cleaned and coated with a separator, and it is strictly forbidden for the separator to stain the joints between the steel bar and the concrete. The vertical inner back flute adopts 50 100 wood square spacing 200mm, and the horizontal outer flute adopts double 48 30 steel pipe spacing 300 500 mm. Reinforcement through the tie through the wall bolts horizontal spacing 500mm, vertical spacing 300 500mm. The diagonal support is reinforced with steel pipes in the upper, middle and lower three lanes to ensure its stability. Double nuts are added on both sides of the bottom three halt bolts. The interior wall adopts ordinary through-wall bolts.
3. Installation of beam formwork.
1) first pop up the axis, beam position line and horizontal control elevation line on the column, adjust the elevation of the adjustable jacking of the fastener scaffold according to the design elevation, adjust it to the predetermined height, and then install the beam bottom keel on the adjustable jacking and fixing the timber. After the keel installation is completed, the beam bottom formwork is installed with plywood. When the main and secondary beams are handed over, the main beam is arched first, and the secondary beam is arched later. After the beam bottom mold is installed, the side mold, the presser foot plate and the diagonal brace are installed.
2) The formwork arching requirements are:
When the beam span is equal to or greater than 4m and less than 9m, the formwork is pressed by 03% arching, when the beam span is equal to or greater than 9m, the formwork is pressed by 035% arching, when cantilever beam, press 035% arching, arching height is not less than 20mm.
3) In order to prevent the beam body from being uneven, the beam bottom is uneven and deflected, the beam side mold is blown up, and the local template is embedded between the columns and beams, and the phenomenon that it is difficult to dismantle, the following measures can be adopted:
1) The formwork should comply with the principle of the side formwork covering the bottom mold, and the connection between the beam formwork and the column formwork, the blanking size should generally be slightly shortened.
2) The beam side mold must have a presser foot plate and a diagonal brace, and the pull wire will be straight to nail the beam side mold.
3) Before pouring concrete, the formwork should be fully watered with water. When pouring concrete, the concrete pouring sequence that makes the support system produce eccentric load shall not be adopted, and when pumping concrete, it shall be leveled with pouring, and the concrete shall not be piled up at the outlet of the pumping pipeline.
4 Installation of floor formwork.
First pass the line, then adjust the elevation of the fastener type scaffold adjustable jacking, adjust it to a predetermined height, erect 48 double steel pipes as @900mm joists on the adjustable jacking supporting plate, erect the wooden fang transverse flute after the joist is fixed, and then install the plywood template on the transverse flute. When laying plywood, it can be spread from all sides and closed in the middle. If it is pressing, the corner template should be nailed through the line.
6.5.7.6. Precautions for the construction of high formwork support frame.
1) When the vertical rod is specifically arranged, the spacing of the main beam, the secondary beam and the roof supporting the vertical rod should be considered as a whole, so that the longitudinal and transverse directions of the three vertical rods are in the same straight line. When adjusting the spacing of the bisecting poles, the spacing of the above-mentioned poles is the maximum limit value, and the spacing can only be adjusted small, not large;
2) The two-way horizontal rods must be fully set up between the vertical rods according to each step distance to ensure that they have sufficient design stiffness in both directions (x, y).
3) The bottom of the full house support frame must be provided with a two-way sweeping rod within 200 meters from the foundation surface;
4) Set up vertical and horizontal scissor supports in strict accordance with the requirements of the specification
5) Ensure that the tightening torque of each fastener is controlled within 45 65nm;
6) It is strictly forbidden to lap the length of the column, and the butt fastener must be used for docking, and the butt joint of the adjacent beam column shall not be in the synchronization, and the butt end of the upright rod shall be smooth;And the joints of the vertical rod and the horizontal rod should be staggered and set in different frames.
7) When the bottom of the column is not at the same height, the longitudinal sweeping rod at the height should be extended to the ground by not less than 2 spans, the height difference shall not be greater than 1 meter, and the column shall not be less than 0 from the upper edge of the slope5 meters.
8) It is strictly forbidden to stagger the steel pipe column of the upper section and the steel pipe column of the lower section to fix it on the horizontal tie rod.
6.5.7.7. Mandatory provisions for the implementation of high-support formwork supports.
The mandatory provisions that should be implemented during the construction and use of this high support frame are as follows:
1) It is strictly forbidden to punch holes in the steel pipe.
2) A transverse horizontal rod must be set at the main node, which is fastened with a right-angle fastener and it is strictly forbidden to dismantle.
3) The scaffold must be provided with longitudinal and horizontal sweeping rods. The longitudinal sweeping rod should be fixed on the pole at a distance of no more than 200mm from the base epithelium with right-angle fasteners. The transverse sweeping rod should also be fixed to the upright pole immediately below the longitudinal sweeping rod by means of right-angle fasteners. When the pole foundation is not at the same height, the longitudinal sweeping rod at the height must be extended to the low place by two spans and fixed with the pole, and the height difference should not be greater than 1m.
4) In addition to the top step, the joints of each step of the rest of the layers must be connected by butt fasteners.
5) The erection of scissor braces and transverse diagonal braces should be erected synchronously with the vertical rods, longitudinal and transverse horizontal rods, etc.
6) The demolition operation must be carried out layer by layer from top to bottom, and it is strictly forbidden to work up and down at the same time.
7) It is strictly forbidden to throw all components to the ground.
8) The quality inspection should be carried out before the use of the old fasteners, and it is strictly forbidden to use them with cracks and deformations, and the bolts with slippery wires must be replaced.
9) The construction load of the working layer should meet the design requirements and should not be overloaded. Formwork supports, cable wind ropes, and conveyor pipes for pumping concrete and mortar shall not be fixed on the scaffolding, and it is strictly forbidden to hang lifting equipment.