[Sichuan] Roof of residential building engineering construction programme
Project overview 1) The project is located in Hongguang Electronic Field, Jianshe South Branch Road, Chenghua District, Chengdu, Sichuan Province. 2) The ± 0.000 elevation of the project is equivalent to the absolute elevation of 503.450m, which is composed of two parts, namely, the ground and the underground. For the multi-storey building with four floors above the ground and two floors below the ground, the indoor and outdoor height difference is 0.3m, and the highest plate elevation of the large roof is 14.1m. The structural system is of frame structure. 3) The scheme includes: roof construction scheme (including roof waterproofing). 2.2 Roof design overview According to the design requirements, the roof is divided into non accessible insulation roof, accessible insulation roof and non accessible non insulation roof. The project adopts inverted roof method, and the roof waterproof grade is Grade II. Roof 1. The method of non accessible thermal insulation roof (pitched roof) is described as follows: 1. Reinforced concrete roof panel embedded? 10. Steel bar head, with a spacing of 900 in both directions, extends out of the leveling course by 30 2. 15 thick 1:3 cement mortar leveling course 3. Brush two layers of cold primer oil 4. 3 thick polyester tire modified asphalt waterproof coiled material 5. Four sides of extruded polystyrene board are lapped 6. 15 thick 1:3 cement mortar leveling course 7. 1:3 cement mortar tile layer, the thinnest part ≥ 20 (equipped with φ) 6.5@500x500 The reinforcement mesh and the roof panel are reserved with φ 10 steel bar head for binding) 8. Grey cement flat tile, each row of tile is bound with double strands of 18 # copper wire and steel bar. 2. Access to the thermal insulation roof, (flat roof) method description is as follows: 1. Structural layer 2. Brush two layers of cold primer oil. 3. Mix ratio 1:6 emulsified asphalt hydrophobic expanded perlite slope making, slope 2%, the thinnest part 30mm, average thickness 50mm, (There is no such item if there is structural slope making) 4. 20 thick 1:3 cement mortar leveling layer 5. Four sides of extruded polystyrene board are lapped 6. 20mm thick 1:2.5 cement mortar protective layer, division joint ≤ 1.0m 7. One layer of 3-thick SBS polyester modified asphalt waterproof coiled material 8. Dry laying of a layer of plastic cloth 9. 20mm thick 1:2.5 cement mortar protective layer 10. 40 thick C20 fine aggregate concrete plus 4% waterproof agent rigid waterproof layer, The interior is equipped with Ф 6.6 two-way reinforcement with a mid-range of 200, and the surface is polished. (Items 2, 3, 5, 6, 7, 9, 10 and 11 are divided into different warehouses according to the column grid, and the warehouse dividing seam is 20 wide and filled with waterproof ointment. The surface of the accessible flat roof is determined by the second decoration) Roof 3. Non accessible thermal insulation roof (balcony). The methods are as follows: 1. Structural layer 2. Brush two layers of cold primer oil 3. 1:3 cement mortar leveling and slope making layer, slope 1%, the thinnest part is 20 thick 4 The four sides of extruded polystyrene board are overlapped with 5. 15mm thick 1:2.5 cement mortar protective layer, and the division joint is ≤ 1.0m. 6. One layer of 3-thick SBS polyester modified asphalt waterproof coiled material. 7. Dry laying of a layer of plastic cloth. 8. 15mm thick 1:2.5 cement mortar protective layer. 9. 40 thick C20 fine aggregate concrete plus 4% waterproof agent rigid waterproof layer, internally equipped with Ф 6.6 two-way steel bars with a mid-range of 200 surface finish. Roof 4. Non accessible and non thermal insulation roof (canopy) 1. Structural layer 2. 1:2.5 waterproof mortar (mixed with waterproof agent), slope according to the drawing, and the thinnest part is 15. Roof waterproof design requirements: 1) Where reinforced concrete cast-in-place roof panels are continuously poured and tamped during construction, construction joints (except for post cast strip) are not allowed to be set, and concrete compactness is ensured. 2) At the connection between the coiled material waterproof roof base course and the protruding roof structure (such as parapet, vertical wall, etc.), as well as at the changes in the shape of the external corners and internal corners of the base course (such as water outlet, eaves gutter, etc.), the foundation is made into an arc, and an additional layer of coiled material is added. 3) High and low span coiled material roof If the high span roof is unorganized drainage, the low span roof is scoured by water, a full layer of coiled material is paved, and then 500 mm wide asbestos tile or 30 thick C20 fine stone concrete slab (with 4 @ 200 two-way reinforcement mesh inside) is paved. When drainage is organized, a reinforced concrete water dustpan is added when the water pipe falls. 4) The rigid roof shall be provided with warehouse dividing joints according to the requirements of Code for Acceptance of Roof Engineering Quality. The junction of rigid roof, parapet and protruding roof shall be sealed with flexible sealing materials. 5) The floor elevation of the rooms and parts with water (such as toilets, balconies, etc.) is 15mm lower than the floor of the surrounding rooms. The drainage slope is toward the floor drain, and the slope i=0.5%. 6) For the above rooms with accumulated water, C20 concrete flanging with the same wall width and 350 high shall be set at the lower part of the walls around the floor (except the door), and waterproof coating layer shall be added on the floor to prevent water leakage. 7) C20 concrete with the same wall width and height of 350 shall be set along the external wall body above the plate surface of all parts (such as balcony, awning, air conditioner shelf, etc.) where there is water accumulation outside. 8) C20 concrete flanging with the same wall width and 350 high shall be set at the junction of roof and wall. 9) 150 high C20 concrete flanging (the same width as the wall) is set around the reserved holes in the floor slab and the tube well on the floor. For the reserved holes in the roof panel, see the flanging method on the structural drawing. For the construction method of flue out of the roof, see the node 2 on page 11 of the national standard 02916-1 atlas. 2.3 Construction arrangement Two secondary structure construction teams and one coiled material waterproof construction team will be arranged for roof construction. Construction period requirements: the roof is affected by many factors such as equipment foundation and roof decoration, so relevant conditions must be considered in advance during construction to ensure the construction quality of roof works. According to the schedule, the roof works will be completed before May 31 this year.
