Project overview
(1) Construction situation
Project name: comprehensive building of a factory in Rizhao
Construction unit: a factory in Rizhao City.
Design unit:
Construction unit: Xi 'an construction company.
Commencement date: March XX 1 day.
Completion date: × year 65438+1October 30th.
Competent department:
(2), structural characteristics
The foundation project is constructed by the construction unit, and the reinforced concrete is cast in place; The main body is an assembled integral frame structure, the transverse frame beams are precast composite beams, and the longitudinal frame beams, secondary beams and stairs are cast-in-situ.
Building number and building area: The first part consists of five floors, with the top floor height of 2 1 m and the height of 4.2m; The second part consists of six floors, with the top floor height of 23. 1 m, 1-2 floor height of 4.8 m, and floors 3, 4 and 5 height of 3.6 m, with a total construction area of 7,834 square meters.
Plane combination form: L-shaped corner building consisting of the first part and the second part.
Seismic fortification: Grade 7.
Decoration: Floor: two parts of kitchen, warehouse, classroom and dormitory use cement mortar floor, and the other parts use terrazzo floor. The bottom cushion is 60 thick 100 plain concrete. Building ceilings and walls: the first part of the stairwell is a gypsum board partition wall, and white plastic wallpaper is pasted; other ceilings and walls are made of lime mortar as the base, and the reinforcement is pasted, and the white mortar is sprayed twice. Exterior wall: mosaics such as green water brushing stones, local components and protruding wall columns. Roofing waterproof layer: asphalt rubber moisture-proof layer, cement vermiculite insulation layer and two-felt and three-oil waterproof layer are paved with mung bean sand.
(3) Characteristics of the construction area
The area where this project is located is relatively flat. The north, east and south sides of the construction site are close to the factory area, bounded by the fence, and Jinhua Road in the southwest, with convenient transportation.
Geological environment conditions: According to the survey report, the soil is first-class macroporous loess, the bearing capacity of natural foundation is 15T/, and the groundwater level is 6-7m below the surface.
Climatic conditions: the dominant wind direction is easterly in summer and autumn, and westerly in winter. Average wind force is 4-5, rainy season is September, 65438+1October.
(4), construction conditions
The company has arranged a construction team, including 80 bricklayers and Plaster workers, 24 carpenters, 65,438+05 steel workers, 40 concrete workers, 8 mechanics, 65,438+02 installers, 65,438+05 painters and 65,438+094 workers. According to the need, some migrant workers can be recruited to assist in the work.
Construction water and electricity are obtained from the factory, and building materials and components can be transported to the site by car.
Cranes that can be used for construction include QT 1-6 and QT 1-2, tower cranes, derricks, portal frames, etc. Cars include Jiefang brand, Huanghe brand (8T), winches, mixers, geotechnical machinery, steel machinery, concrete vibrators and scaffolding, which can be supplied as planned.
Dividing construction sections and construction methods
(a), the division of the construction period:
A * * * is divided into three construction sections, the first part is a construction section, and the second part is two construction sections.
(2), the main project:
The installation method of wall formwork is pre-assembly. The sequence is as follows: check the pre-assembled formwork and its number before installation → hoist one formwork in place → set the support → bind the steel bar → install the through-wall bolt → hoist another formwork in place → tighten the through-wall bolt → support and fix → conduct comprehensive inspection → connect with the adjacent wall, column and floor formwork.
Elevator shaft formwork: the concrete quality of elevator shaft is the key to the construction of high-rise buildings. Especially its verticality will directly affect the smooth installation of elevators in the future. Therefore, in the selection of elevator shaft formwork, we decided to adopt articulated cylindrical steel formwork and use tower crane for overall hoisting. This is not only beneficial to the progress, but also ensures the quality of the elevator shaft. Floor formwork construction
The assembly and installation sequence of floor formwork is: erection of supports and tie rods → installation of longitudinal and transverse steel beams → leveling of column top elevation → laying formwork blocks → checking formwork flatness and leveling.
Precautions for installation:
(1) When the single block is assembled in place, it should be connected with the wall and beam formwork from around each node, and then laid to the center. Side ribs of adjacent formwork shall be connected by U-clips or hook bolts according to design requirements. You can also pre-assemble several pieces with U-shaped cards and then lay them.
(2) When the floor formwork is laid to the last end, the narrow strip that does not conform to the modulus of steel formwork shall be filled with boards, and the practice of squeezing two pieces of steel formwork shall not be adopted, so as not to cause the top of beam formwork to be too small.
(3) Each floor template is shelved, with three points as the floor template and plywood as the template.
Key points of construction:
1 The formwork support frame of the floor slab is supported by steel pipe fasteners, and a wooden stare blankly is placed on it. The spacing of wooden stare blankly should be determined by calculation.
2 Before the construction of plywood formwork, it is advisable to design the formwork layout. During the construction, the formwork should be arranged in strict accordance with the formwork layout to reduce the sawing of plywood formwork, which is beneficial to the turnover use of plywood formwork;
3 plywood formwork panel should be coated with release agent to facilitate demoulding;
4 plywood formwork joints should be smooth, and the joints can be removed by pasting the formwork with adhesive tape.
Non-load-bearing side formwork can only be removed when the concrete surface and edges and corners are not damaged (greater than 1N/mm2), and the load-bearing side formwork shall be implemented according to the relevant provisions of Code for Construction and Acceptance of Concrete Structure Engineering.
The method of formwork dismantling sequence shall be carried out in accordance with the provisions of panel design, and follow the principles of first supporting and then dismantling, first supporting and then dismantling, first non-bearing part and then bearing part, and top-down. When dismantling the formwork, it is forbidden to use sledgehammer and crowbar to smash and pry. Dismantled templates and other accessories are strictly prohibited to be discarded. Someone should pick it up, send it there and pile it in the designated place. And do timely cleaning, maintenance and coating isolation agent for later use. Bowl-buckle steel pipe scaffold system is adopted in this project.
(1) scaffolding
1) The technological process of bowl-buckle steel pipe scaffold erection is as follows: foundation preparation → placing bottom plate → placing base → riser, installing cross bars to form box → longitudinally installing cross bars and riser to the required length → installing diagonal braces → laying scaffolding → installing skirting guardrail → setting connection nodes.
2) Installation requires at least two people to cooperate. On the basis of leveling and tamping, lay the stow-wood. The width and thickness of the skids shall be not less than 200mm and 50mm respectively.
3) Pull the wire and place the base. The pedestals on the same side should be in a straight line, and the pedestals should be kept on the same horizontal line, and a small amount of height difference should be adjusted with adjustable brackets.
4) Set two horizontal vertical pipes inside and outside, and install two horizontal bars with a longitudinal spacing of at least 1.2m to form a box.
5) One person straightens the square frame, the other person inserts one end of the longitudinal horizontal bar into the bottom bowl buckle of the vertical pipe, and the other end into the bottom bowl buckle of the third vertical pipe, and then installs the horizontal bar to form a stable square.
6) Continue to erect vertically until the required length is reached. During erection, pay attention to ensure that the risers are in rows and aligned horizontally. The first step is to keep the longitudinal horizontal bar or level.
7) Risers of different lengths and specifications should be set at intervals at the bottom to stagger the joints.
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