Selection of key construction methods for teaching building frame engineering
In combination with the site conditions of this project and the particularity of the school, in order not to affect the normal office and teaching of the school, effective control measures should be taken for noise, dust, safety and traffic, and corresponding construction methods should be determined.
1 Scaffolding project
In the structural construction stage, double-row landing scaffolding is used for the outer frame, and it is erected from the second floor underground to the top floor. The outer side of the scaffolding is covered with safety green nets, and a platform is erected above the office of the East Project Department for falling objects.
2 reinforcement engineering
The processing and binding of reinforcement shall be carried out according to the conventional practice.
because the new grade III steel in the market is very different from the original grade III steel, but it is very similar to the commonly used grade II steel, mainly in the chemical composition of steel bars. The new grade III steel has increased the vanadium content on the basis of the original grade II steel 2MnSi, making its chemical composition 25MnSiV, which is difficult to distinguish from the appearance. Therefore, it is necessary to strengthen the management of identification if it is classified from the raw materials on the construction site.
rebar connection and lap joint: rebar with a diameter of ≥2 and the main rebar of all concealed columns of frame beams, columns and shear walls are connected by ribbed rolling straight threads, and the rest rebar is lap joint.
3 formwork project
The formwork of this project mainly includes horizontal formwork system and vertical formwork system.
6 series small steel formwork is used for the basement exterior wall, and 86 series all-steel formwork is used for the shear wall formwork; Adjustable all-steel formwork is used for the first-stage independent column, and wood veneer is used for the second-stage independent column; All-steel formwork shall be used for the inner wall and shaft, and steel formwork shall be used for the stair step.
15-thick wood veneer is used for horizontal formwork, and 18-thick wood veneer is used for individual parts.
the vertical support system adopts the "early dismantling vertical support system" which was successfully developed and patented by our company. Special-shaped steel keels are combined with quick release heads for primary and secondary keels to speed up the turnover of horizontal floor formwork and beam side formwork.
The formwork of some columns on the ground adopts adjustable column steel formwork, and is assisted by wood veneer. Shear walls are constructed with all-steel formwork.
for the construction of other sporadic concrete structures, wooden plywood formwork is used.
4 concrete works
In this project, the concrete is mixed on site. Ordinary grade concrete is constructed by conventional technology.
(1) Control of beam-column joints:
The beam-column wall joints in this project are large, and the steel bars at the joints are dense. When pouring concrete in construction, it is easy to cause the internal vibration of nodes to be not dense, resulting in quality hidden dangers. It is necessary to control the concrete mixture ratio, concrete aggregate and pouring vibration.
The model of column concrete at beam-column joints is higher than that of beam and slab concrete. Before pouring, it is necessary to bury steel mesh at the height of 1/2 beam, and then pour it twice. For specific methods, see Chapter 9 Concrete Engineering Construction Methods.
(2) seasonal construction:
winter construction stage: during winter construction, do a good job in concrete thermal insulation and antifreeze, from the mixing in concrete mixing station, from the process of transportation to the formwork stage, strict thermal calculation is required, and the thermal insulation measures should be adjusted in time according to the on-site temperature measurement results. This project adopts comprehensive heat storage method for thermal insulation construction, and the thermal insulation materials are covered with fireproof rock wool and plastic sheets.
in windy weather, environmental protection measures such as dust prevention and sand blowing prevention should be taken for backfill soil and roof construction.
rainy season: the main construction site is the secondary structure, so it is necessary to do well the drainage and flood control measures at the construction site and the moisture-proof measures at important sites such as the cement warehouse.
5 site planning scheme
according to the site conditions and construction schedule, the construction site is arranged in three stages: the first stage is manual digging cast-in-place pile and underground structure construction stage, the second stage is main structure, and the third stage is secondary structure, rough decoration, fine decoration and electromechanical installation stage. The main layout contents include: site division, waterfront, power supply, living area, office area, parking road and other temporary facilities.
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