A, construction preparation
(a) operating conditions
1, plate design: according to the project structure type and characteristics and site construction conditions, the template design, determine the template layout, longitudinal and transversal keel specifications, quantity, arrangement of dimensions, column hoops selection of the type and spacing, the spacing of beam plate support, beam-column nodes, main and secondary Beam nodes, primary and secondary beam node samples. Calculate the strength, rigidity and stability of the template and support. Drawing a full set of template design drawings (template layout plan, block diagram, assembly diagram, reinforcement drawing, node drawing, parts processing diagram and non-stereotyped parts of the splicing processing diagram). The number of templates should be in the template design according to the flow section division, a comprehensive study to determine the reasonable number of template preparation.
2, template assembly:
(1) assembly site compacted and leveled, conditions permitting can be set up assembly operation platform.
(2) according to the size of the template design drawings, the use of countersunk head self-tapping screws will be bamboo glue boards and square wood assembled into a whole template, according to the requirements of the seam at the additional small keel.
(3) bamboo glue board template sawed edge in a timely manner with waterproof paint sealing two, to prevent the bamboo glue board template use process cracking, peeling.
3, template processing, the person carefully check the template specifications size, according to the molding diagram number, and uniformly painted isolation agent, sub-specification yard, and rain, moisture, anti-smash measures.
4, put a good axis, template edge line, horizontal control elevation, template bottom flat, solid, if not up to the requirements of the cement mortar leveling layer should be done, column reinforcement with ground anchors have been buried and can be used.
5, crutches, wall reinforcement binding is completed, water and electricity pipelines and buried parts have been installed, tied to the protective layer of reinforcement pads, and for a good hidden acceptance procedures.
(B) material requirements
1, bamboo template: size (1220 × 2440mm), thickness (9, 12, 15, 18mm) (a single project is best to choose no more than two thicknesses is reasonable).
2, square wood: 50 × 100mm, 100 × 100mm square wood, requires uniform specifications, size rules.
3, tie bolts: the use of φ14 or more grade Ⅰ steel (preferably with HPB235), bilateral sets of buckles, and both sides of the two nuts with a good, oiled spare.
4, isolation agent: strictly prohibit the use of oil-based isolation agent, must use water-based isolation agent.
5, template cross-section support materials: the use of steel support, the two ends of the point good anti-rust paint.
(C) construction machinery
1, carpentry circular saws, carpentry planes, pressure planes, portable electric saws, portable pressure planes, eye drills, line drop, leaning boards, square feet, iron levels, crowbars and so on.
2, support system: column hoop, steel pipe pillar, steel pipe scaffolding or bowl buckle scaffolding.
Two, quality requirements
Please refer to the specific requirements of this book box foundation engineering; chapter; template engineering; the corresponding part.
Three, process
(I) install column template
Set up and install scaffolding → paste sealing strips along the template edge line → set up column piece mold → install column hoop → correct column square, vertical and position → comprehensive inspection and correction → group fixing → do pre-inspection
(II) install beam template
Popping up and checking the beam axis and level line → Set up beam formwork bracket→install beam bottom flute→install beam bottom formwork→arching of beam bottom→tie reinforcement→install beam side formwork→install another side formwork→install upper and lower locking flute, diagonal support flute, waist flute and tensile bolts→review beam formwork size and position→connect with adjacent formwork→do pre-checking
(3)Installation of roof formwork
Set up bracket→install transverse and longitudinal sizes of keel→adjust the under-plate Skin elevation and arching → laying top plate template → check template skin elevation, flatness → do pre-check
four, operation process
(a) install column template
1, template grouping is completed, according to the requirements of template design drawings to leave a clean opening, check the template's diagonal, flatness and external dimensions.
2, lifting the first template, and temporary support or lead wire and column reinforcement temporary tie fixed.
3, then lifting the second, third, fourth piece of template, good temporary support or fixed.
4, first install the upper and lower two column hoops, and temporarily fixed with scaffolding pipe and frame.
5, gradually install the rest of the column hoop, correct the column template axis displacement, vertical deviation, section, diagonal, and do support.
6, in accordance with the above method to install a certain flow section column template, comprehensively check the quality of the installation, pay attention to the vertical and horizontal shade of the direction are hanging through the line to check, and make a good group of horizontal tension (support) rods and shear struts fixed.
7, will be cleaned up in the column mold thousands of clean, closed clean-up day, check the qualified office pre-inspection.
(ii) installation of beam template
1, in the column concrete pop up beam axis and horizontal line, and review.
2, before installing the beam template bracket, the first floor for the soil ground should be leveled and tamped, either the first floor soil ground or the floor ground, in the special pillar foot to lay through the long scaffolding board, and the floor between the upper and lower pillars should be in the same straight line.
3, build the beam bottom small transverse wood, spacing in line with the template design requirements.
4, pull the line to install the beam bottom template, control the arch height of the beam bottom in line with the template design requirements. After the acceptance of the beam bottom template, use the steel pipe fastener to fix it.
5, in the bottom mold binding reinforcement, after acceptance, remove debris, install the beam side template, the two sides of the template and the bottom mold with scaffolding pipe and fasteners fixed. Beam side template upper mouth to straighten the line, fixed with beam internal support.
6, review the cross-section size of the beam template, and adjacent beam-column template connection fixed.
7, after installation, correct the beam centerline elevation, section size. Clean up the debris in the beam template, check and pass the office pre-inspection.
(C) installation of floor template
1, bracket erection before the floor and strut foot treatment with the beam template process points in the relevant content.
2, scaffolding in accordance with the template design requirements after erection, according to the given horizontal line to adjust the elevation of the upper support and the height of the arch.
3, in accordance with the requirements of the template design of the support plate under the size of the keel, its spacing must be in line with the requirements of the template design.
4, laying bamboo glue board template, use electric drill to make eyes, screws and keel tightening. Must ensure that the template seam tight.
5, at the end of the two adjacent bamboo glue board extruded sealing strip, the protruding part with a knife to scrape clean.
6, template laying is completed, with a ruler, ruler and level to check the flatness and floor elevation, and correction.
7, the template will be cleaned up debris, check and pass the Office of the pre-inspection.
(D) template removal
1, the general points of the template removal:
(1) side mold removal: in the concrete strength to ensure that its surface and pike angle is not damaged due to the removal of the template, before removing.
(2) the bottom mold and winter construction template removal, must implement the "concrete structure engineering construction quality acceptance specification" GB50204 and "construction engineering winter construction regulations" JGJ104 relevant provisions. The operation team must carry out the application for dismantling the touching approved by the technical department before dismantling.
(3) the demolition of the template of prestressed concrete structural members, in addition to the implementation of the corresponding provisions of GB50204, the side molds should be removed before the prestressing tension; the bottom molds should be formed in the structural members of prestressing after the demolition.
(4) the structure of the removed formwork and support, after the concrete reaches the design strength level, it is allowed to bear the full use of the load; when the effect of the construction load is more unfavorable than the effect of the use of the load, it must be accounted for, and add a temporary support.
(5) The order and method of removing the formwork shall be in accordance with the provisions of the design of the allotment. If there is no design provisions, should follow the first support after demolition, after support first demolition; first demolition of non-load-bearing template, after demolition of the load-bearing part of the template; from top to bottom, the bracket first demolition of lateral support, after the demolition of the vertical support and other principles.
(6) template project work organization, should follow the support mold and demolding unified by a work team to perform operations. The advantage is that, support the mold on the consideration of the convenience and safety of dismantling the mold, dismantling the mold personnel familiar with, in accordance with the dismantling of the key points, the progress of dismantling the mold, safety, protection of the template and accessories are beneficial.
2, column template demolition:
(1) process:
Removal of pull cuttings or diagonal braces → top-down removal of column hoops → removal of part of the vertical ribs → demolition of the template and accessories transportation and maintenance
(2) column template demolition, from the upper mouth to the outside of the gently hit and pry gently, so that touch the plate loosened to add a suitable temporary support. To prevent the column template tipping injury.
3, beam plate template removal:
(1)Process flow
Removal of bracket part of the horizontal tie rod and scissor braces→removal of side templates→Downward adjustment of floor struts→make the template down→Segmented sub-demolition of floor templates→Wooden keel and struts→Demolition of the beam floor templates and bracing system
(2)Demolition process construction key points:
①Demolition of Support part of the horizontal ties and scissor braces for operation. And then remove the horizontal steel pipe and diagonal support on the beam side formwork, gently pry the beam side formwork to detach it from the concrete surface.
② down the pillar top support screw, pry the keel under the template, so that the keel and the template separation, or with a wooden hammer light impact, remove the first piece, and then piece by piece, section by section removal. Do not pry with steel rod or hammer. When each bamboo glue board is removed, or put on the ground with artificial support, or the top of the pillar screw in the downward adjustment of a considerable height, in order to hold the template removed. Strictly prohibit the template free fall on the ground.
③The method of dismantling the template at the bottom of the beam is roughly the same as that of the floor template. However, when dismantling the bottom template of beam with large span, the top support screw should be adjusted downward from the middle of the span, and then wither downward to the ends one by one, and when dismantling the strut of the bottom template of the sorghum, the work should also be done from the middle of the span to the two ends.
Five, finished product protection
1, pre-assembled templates should have storage site, the site should be leveled and compacted. When the template is placed flat, there should be wooden square pad frame. Standing, to set up the classification template frame, template touching the ground to cushion wooden square, so as to ensure that the template is not twisted and not deformed. Can't pile up or pile up scattered templates and accessories on the templates of grouping.
2, the work surface has been installed wall, column template, not allowed to collide in the lifting of other templates, not allowed in the pre-assembled template in place as a temporary dependence, in order to prevent the template deformation or vertical deviation. The plane template which has been installed on the working surface is not allowed to be used as a temporary stacking and working platform, so as to ensure the stability of the bracket and prevent the deviation of the elevation and leveling of the plane template.
3, dismantle the template, not with a sledgehammer, crowbar hard smash prying, so as to avoid the shape of the concrete and internal damage.
6, should pay attention to the quality of
1, column template:
(1) mold, section size is not allowed to prevent and control methods: according to the crutch height and section size design accounting for the column hoops of their own sectional dimensions and spacing, as well as the use of large section of columns through the column bolts and vertical flute to ensure that the crutches on the strength of the mold, the stiffness of enough to resist the side pressure of the concrete. Construction should be carefully in accordance with the design requirements of the work.
(2) the column body torsion prevention and control methods, support the mold before the correction of the column reinforcement, so that it is not twisted to the first. Installation of diagonal bracing (or pull anchor), hanging line for vertical, two adjacent pieces of column mold from the upper end of each side of the hanging two points, so that the line fell to the ground, the line fell to the two points shown in the column position line distance are equal to ensure that the column mold is not twisted to.
(3) axis displacement, a row of columns are not in the same straight line. Method of prevention: rows of columns, support mold before the ground to pop up the household axis and axis edge through the line, and then pop up each column of the other direction of the axis, and then determine the other two sides of the column. When supporting the mold, the first two ends of the column mold, correct the vertical and position without error, the top of the column mold pull through the line, and then support the middle of the column template. When the distance between the columns is not large, through the rows of support for horizontal ties and scissor braces, when the distance between the columns is large, each column is supported on all four sides to ensure that each column is vertical and the position is correct.
2, beam, plate template:
Beam, the bottom of the plate is not flat, deflection; beam side template is not straight; beam up and down on the day of the mold to prevent and control the method of sorghum, the bottom of the plate template keel, pillar cross-section dimensions and spacing should be calculated through the design of the decision to make the template of the support system has sufficient strength and stiffness, the work should be carefully implemented in the design requirements, in order to prevent deformation of templates for the pouring of concrete. The formwork pillars should be erected on solid ground padded with through-length wooden boards to prevent the pillars from sinking and causing the beams and slabs to deflect. Beam and plate formwork should be arched according to design or specification. The upper and lower mouth of the beam template should be set pin flute, and then lateral support to ensure that the upper and lower mouth template is not deformed.
More about the engineering/service/procurement category of tender writing production, enhance the winning rate, you can click the bottom of the official website customer service free consultation:/#/?source=bdzd