First, the construction preparation
1, technical preparation
(1) On the basis of carefully reading the design drawings, through the joint review of drawings, the difficult problems in the construction of all-steel large formwork are solved, which creates favorable conditions for the construction of large formwork. For example, the setting position of air conditioning panel and post-pouring belt is beneficial to the construction of large formwork as much as possible on the premise of meeting the use function and design requirements; For the concrete decorative belt (line) of the external wall of the structure, under the condition of not changing the design, the site prefabrication should be considered, and the construction scheme should be formulated to determine the hoisting scheme and installation method of the embedded parts and components of the structure.
(2) According to the specific characteristics of the engineering structure, determine the specifications and models of lifting equipment, and divide the construction flow section according to the principles of economy, balance and rationality.
(3) Entrust a professional company to design, process and manufacture plates (or technically transform the existing all-steel formwork according to the specific characteristics of the engineering structure).
Design principle of switchboard:
A. Configure the template according to the divided construction flow sections, and require the template to be durable, economical and reasonable, and common for all flow sections;
B. symmetry of single template configuration;
C, the lifting weight of a single large template must meet the requirements of on-site lifting equipment.
General requirements for switchboard design:
A. the size of the large formwork must conform to the building modulus; For the size that does not meet the modulus in the design of the matching plate, the design method of assembling and adjusting the template is given priority, so as to minimize the specifications of the cornea and strive to finally shape the cornea;
B. The design of lifting ring position of large formwork must be safe and reliable, and the determination of lifting ring position should ensure the balance of lifting large formwork, which should be set at 0.2-0.25 L； of formwork length;
C. When designing the height of the distribution board at the position of external wall, elevator shaft and stair section, the overlapping size with the lower floor should be considered.
Distribution board design content:
A. Write construction instructions
B. layout of distribution board;
C. Layout design drawing of large formwork, assembly node drawing and parts processing detail drawing;
D. Support drawings of nodes and special parts;
E. List of large template structures and accessories.
(4) Be familiar with template design, prepare construction scheme, conduct technical training before construction, and conduct construction technical disclosure.
2, material preparation
1, the roof and beam are made of 15mm thick mirror multilayer board, with 50×60 square meters for the inside edge of the board bottom and 50×60 square meters for the outside edge. The load-bearing frame adopts direct-entry double self-locking multifunctional frame, which consists of vertical rods, cross bars and jacks.
2. The basement to the three-story shear wall and column are made of15 х 910 х1820 mirror-like multi-layer boards, which are assembled at the woodworking production and construction site, with a back stare blankly of 50×60 square meters, φ48×3.0 steel pipes as transverse reinforcement, and recyclable M/kloc as bolt reinforcement. Inclined support, reinforced with φ48×3.0 steel pipe (450 as far as possible).
3. The standard shear wall is constructed with all steel formwork. All-steel formwork is designed, processed and produced by a professional company, and its preparation is completed in the formwork factory. However, when signing the entrustment agreement, the quality acceptance standards of steel bar manufacturers and formwork processing and related structural requirements should be made clear. If the existing all-steel large formwork is technically reformed, the scheme for reforming the large formwork should be made according to the structural characteristics of the project and the present situation of the formwork, and the material consumption plan should be put forward.
Composition of (1) large template
The large formwork is composed of panel, steel skeleton, angle formwork, diagonal braces, operating platform fasteners, adjusting screws, opposite bolts and other accessories.
(2) Main material specifications (Q235 is used for formwork steel skeleton and panel)
Panel: 6mm thick steel plate; Vertical rib: [8 back stare blankly: [10]
Brace: [8, Ф 40 bracket: Ф 48× 3.0 counter-pull bolt: M30, T20×6.
(3) the template structure requirements
A. The overall size and hole size of the large formwork shall conform to the wall size and building modulus, so that the formwork can be finalized and used universally;
B simple structure, light weight, durability and easy processing, which can meet the requirements of cast-in-place concrete molding and surface quality;
C the formwork support system shall meet the construction and safety requirements through the regulating device;
D. The operating platform should be set according to the construction needs, and it should be firmly connected with the large formwork, safe and reliable, and easy to disassemble and assemble;
E. Reasonably determine the position of the lifting ring (the lifting ring material shall not be cold-bent) to ensure the safety and reliability of the connection between the steel lifting ring and the template;
F. The formwork shall be provided with opposite bolts and their connectors to bear the lateral pressure of concrete and control the thickness of the wall. The holes of the opposite bolts on the large formwork shall be symmetrically arranged left and right to meet the requirements of universality;
G elevator shaft formwork must be equipped with a special platform to ensure construction safety.
(4) The product quality of large formwork
It meets the requirements of Technical Specification for Large Formwork in Building Engineering.
4, machines and personnel preparation
(1) Tower crane: select the crane according to the lifting weight of the farthest formwork;
(2) Concrete delivery pump: it is selected according to the concrete pouring speed;
(3) Distributor: Select the cloth according to the cloth radius.
(4) The machine is prepared to use two circular machines, a planer and a planer.
(5) Pay-off to prepare a theodolite and a level.
(6) Personnel arrangement: 3 carpenters, quality engineer 1 person, 2 quality inspection carpenters and 60 basic carpenters, with a value above 0.000 100 person.
5. Fuck oak parts
(1) Choose the stacking place of all-steel formwork reasonably and level it off. It is required to pile up templates within the radius of tower crane to facilitate the vertical lifting of templates;
(2) the structural layer axis positioning pay-off qualified;
(3) Before closing the mold, check and accept the quality of the reinforcement in the construction layer, and make a record of the hidden acceptance and quality acceptance of the reinforcement inspection lot;
(4) Having perfect safety facilities and safety management measures.
Second, the construction technology and construction method
The foundation raft, basement to the third floor wall are constructed with wooden formwork, and reinforced by pulling screws. The supporting system adopts socket-type frame and steel pipe fastener full frame. The auxiliary support adopts φ 14 counter-pull screw (the external wall adopts a new type of water-stop counter-pull rod). The shear wall is made of 1.5cm mirror multi-layer board, and the outer back is made of square wood, which is reinforced by pulling bolts. Standard story shear wall formwork adopts integral all-steel shaped large formwork; The beam and slab of cast-in-place building structure adopts scaffold support+early dismantling support head+wooden keel+mirror multilayer early dismantling template support scheme; Cantilever scaffold is used for external scaffold; The cascade adopts open integral one-step forming steel formwork. Using all-steel large formwork and mirror multi-layer board can make the wall and ceiling achieve the effect of fair-faced concrete without plastering.
process flow
A, shear wall template:
Template cleaning → coating release agent → elastic control line → installing corner template → installing internal mold → installing opposite bolt → installing external mold → adjusting verticality of template → pouring concrete → ripping.
B structure beam and plate template:
Template cleaning → release agent coating → beam template positioning installation → roof template installation → inspection and acceptance → steel bar binding → concrete pouring → form removal.
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