I. Overview of the Project:
Ningbo XX Center is located in the east of XX Road in downtown XX.
This project is designed by Guangdong XXX Co., Ltd., supervised by Ningbo XXX Co., Ltd. and contracted by XXX Group Co., Ltd. ..
The building plane of the Central Stadium is circular, with a diameter of 84.6 meters, a building height of 20.245 meters and a building area of 5762 square meters.
The structure is a steel truss (mainly bearing the roof system), the facilities and equipment room and the audience stand are all three-story (local four-story) cast-in-place reinforced concrete frames, in which the audience stand is an arc stepped reinforced concrete floor; The plane layout of the reinforced concrete main frame is at 15 degree, with * * 24 axes, 0.000 is equivalent to the elevation of the Yellow Sea of 3.85 m, the height of the second floor (highest point) is 4.83 m, and the height of the third floor (highest point) is 4. 16 m, and four post-poured zones are set, respectively on the A3-A4 axes. Axis A 10 ~A 1 1, A 15~ A 16, A22~A23. During the construction, the post-cast strip is used as the construction section, and the adjacent axes of formwork and support intersect during the construction to form an independent system. The maximum span of the beam is not more than 8 m, and all frame concrete in this project is commercial concrete provided by Ningbo Ji Hua Company.
Section of reinforced concrete member:
1) column (KZ): 800× 600, 700 × 600, 600 × 600, 500 × 600, 500 × 500, @ 600; LZ :500 × 500、300×300；
2) Frame beam: (KL): 300× 500, 300 × 800, 400 × 500, 500 × 600, 500 × 700, 600 × 700, 600 × 800, in which the stands of the audience are inclined beams;
3) stepped standing beam (KTL): composed of 200× 300, 200 × 320, 200 × 560, 200 × 720, 200 × 760 and 80 thick plates;
4) Floor thickness: 100, 120,180;
5) There are three stairs at the main entrance of the Central Stadium, which are located on the A5 axis, A 13 axis and A 19 axis respectively; Cast-in-place slab concrete (2 B9): the slab thickness is 180, and the elevation is -0.47~4.7 m (above the second floor). The rest stairs lead to five stands (omitting the stairs 2# and 3#).
Based on the above summary, the component forms and specifications of this single project are complex, so this scheme selects representative larger components, and designs and compiles targeted formwork support under the most unfavorable circumstances.
Second, the design calculation basis
1, engineering design drawings
2. Technical Code for Safety of Fastener Steel Pipe Scaffolding in Building Construction (JJ130-2001)
3. Code for Construction and Acceptance of Concrete Structure Engineering (GB50204-2002)
4. Code for Design of Building Foundation
5. Code for Load of Building Structures (GB50009-2002)
6. Technical Specification for Steel Pipe Formwork Support of Fasteners in Building Construction (J 10905-2006)
Third, the template construction scheme
1, material preparation and template layout
The template of this project has a large workload, and the corresponding turnover materials have a large one-time investment and many personnel. According to the characteristics of the project and the requirements of the construction period, the beam-slab formwork system was dismantled earlier, and all the wooden patterns were adopted. The formwork at the bottom of the beam adopts 18 thick nine plywood and 50×70 ㎜ wooden stare blankly, and the horizontal steel pipe φ 48 under the wooden stare blankly is supported on the upright post. Complete 2/3 floor beam formwork and side formwork. The beam side formwork is reinforced with 9 pieces of plywood and 50×70 square timber. After the beam bottom formwork is installed, tie the steel bar, and install the formwork on both sides after passing the inspection. The lower column of the beam is made of φ 48× 3.2 steel pipes, and the side plates with a beam height of more than 600 are clamped by double steel pipes with gable tips and opposite bolts φ 12. The opposite bolt is movable, and the side formwork is removed and pulled out. Considering the bulging value, the beam bottom formwork should be bulging from 1/400 to 1/500. In order to ensure the construction period, the column template should be equipped with one layer, and the beam slab bottom template should be equipped with two layers.
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