I. Overview of the Project
(1) The construction areas of industrial pool, fire fighting pool and living pool are 209m2, 96m2 and15m2 respectively, and the pools are 800m3, 300m3 and 50m3 respectively. The adjacent distance between them is about 10 meter, and the main equipment and materials are selected from domestic and foreign high-quality products.
(2) The industrial, fire-fighting and domestic pools are rectangular reinforced concrete pools, with the buried depth of 1.2m, the exposed ground of 3.65m, 3.65m, 438+05m, 3.65m and 438+02m respectively, and the soil covered by the pool machine is 500 thick. The external wall of the pool is made of 240mm thick red brick, and the buried depth of the foundation cushion is-.
Second, the construction deployment
(1) construction preparation:
Before construction, be familiar with the drawings, check the elevation, reserve casing and embedded parts, set out the axis, and do a good job of surrounding drainage.
(2) Construction sequence:
The first step is to construct 800m3 foundation cushion and pool (digging foundation pit → cleaning the bottom → checking the temporary drainage around the pool → shuttering → pouring concrete cushion → backfilling and tamping around the cushion layer by layer). After backfilling around the cushion is completed, the 300m3 and 50m3 cushion will be constructed again. The construction method of cushion is the same as above. In the second step, the bottom plate of 800m3, 300m3 and 50m3 pools and the upper part of the inclined bracket of the pool wall are about 300 mm. In the third step, the lower part of the inclined bracket connected with the top plate of the 800m3 pool wall is constructed. In order to facilitate the construction and not affect the construction period, 300m3 and 50m3 pools are interspersed with 800m3 pools. Fourthly, the cast-in-place roof and pool are constructed, and the irrigation test and acceptance are carried out. Step 5, build a diversion wall in the pool and a thermal insulation wall on the outer wall of the pool. The sixth step is plastering inside and outside the construction pool wall. Step 7: Cover the top of the construction pool with soil, and backfill and tamp around it.
(3) Construction organization:
Set up a special class for pool construction, with foundation cleaning and backfilling workers 18, concrete workers (25), bricklayers (including bricklaying and Plaster workers) 15, steel workers 10, carpenters (20) and welders (5), that is, earthwork shift, concrete shift, bricklayer shift and steel shift.
(4) Mechanical equipment:
1m3 backhoe 1 set, bulldozer 1 set, 5 electric rammers, 3 electric dumpers, 4 5T dump trucks, 2 electric hoists, concrete mixer, concrete pump and ash catcher are uniformly deployed.
(5) Construction progress:
The total construction time of the three pools is 35 days, and the assembly line construction method is adopted, that is, (foundation pit excavation = 2 days, foundation cushion = 5 days, backfilling = 2 days, steel bar binding = 5 days, concrete pouring at the top of the bottom wall = 7 days, water testing = 2 days, masonry = 4 days, plastering = 7 days, and soil covering = 2 days).
Third, the specific construction methods
1, construction survey:
According to the fixed coordinates and elevation in the station area, use theodolite and level to measure, show the position and elevation, use gantry steel pipe to set axis control piles and elevation piles, and release temporary leveling points. The setting of temporary leveling points and axis control piles is convenient for observation, and must be firm, and protective measures should be taken.
2, foundation pit excavation:
The excavation width at the bottom of the foundation pit can be calculated according to the following formula:
B=B 1+2b 1+b2
When the bottom of foundation pit b is excavated for a long or wide time.
B 1 mat width or length
B 1 width of each side of the working face
B2 variable (temporary drainage or baffle width required)
Calculate the slope according to hard plastic cohesive soil, and the slope coefficient is 1: 0.75. According to the actual situation, temporary Xiaoming ditch (500mm away from the cushion) needs to be set around the basement. Another temporary pumping well is set up to prevent the basement soil from being damaged when it rains. When digging earthwork in the basement, it can be dug to 200mm above the design elevation according to the performance of backhoe, and then manually dug to the design elevation. In case of groundwater, according to the drainage situation and site conditions, dig above the groundwater level, and then dig to the predetermined elevation after excluding groundwater.
3, slot inspection
According to the requirements of drawings, different soils have different foundation treatments. When excavating the foundation pit, we should confirm the soil quality with the design and supervision in time and decide the foundation form operation. The allowable deviation of foundation pit bottom elevation is 20 mm 。
4, construction drainage
Open trench drainage is used for construction drainage, and a drainage well is set to pump water with fresh water and discharge it into the site drainage system. After the drainage ditch is terminated, the drainage ditch and well should be filled with sand and gravel.
5. Foundation cushion
After the slot inspection is completed, the carpentry shuttering shall be arranged in time and the elevation of the cushion shall be re-measured. Pay attention to the size of the part to be retained in the puddle and pour the whole concrete cushion. When the concrete strength reaches 75%, clean up the sundries, drain the accumulated water, and backfill around the cushion layer by layer.
6, the bottom, wall and roof construction
First, clean the cushion layer, pop it up according to the axis, wall thickness and column position on the drawing, then tie the steel bar and embed the welding sleeve on the wall. On the premise of ensuring the quality, the existing pool is poured in three times: the first construction site is left 300mm above the bottom plate of the pool wall and the inclined bracket, and a rubber or steel water stop is set in the wall at 300mm, with a width of 300 and a length of 150mm exposed in the concrete, and it should be placed flat. For the second time, the reinforcement and formwork of the pool wall are bound, and the construction site is left at the lower part of the diagonal brace between the roof and the pool wall. For the third time, bind the roof steel bar, embed the steam hole casing, and pour the roof concrete. Do a good job in the maintenance of the pool wall roof and concrete.
7. Handle construction joints carefully
Clean loose concrete slag, sundries, etc. After the completion of the construction site steel binding in a timely manner. During construction, the construction joints should be shortened as far as possible, and the interval between the upper and lower layers of concrete should be watered before watering. Pave 10cm cement mortar (fair-faced concrete with the same strength, excluding stones) before pouring concrete.
8, steel binding construction
Carry out construction according to the construction drawings, and strictly control the thickness of protective layer. When the steel bar meets the hole, it should be bypassed as far as possible and not cut off. If it must be cut off, it should be welded and anchored with reinforcing ring reinforcement of the hole. Lap joints of steel bars shall be staggered according to the requirements of drawings. The number of steel bar joints with the same section should not be greater than 25% of the total.
9, template engineering
The branch pool, pool wall and top formwork shall be supported by internal formwork first, and then by external formwork. In order to make the formwork have enough strength, rigidity and stability, the inner and outer formwork are fastened with Rachel water stop bolts and steel pipes, and the inner ring of the inner formwork is tightened with blue bolts and screws.
10, concrete pouring and vibrating
When pouring concrete, it should be carried out evenly around the wall of the pool, and the height of each layer is about 20-25cm (when the pouring height exceeds 2 meters, buckets, chutes and pipes should be set up to ensure that the concrete does not segregate), and special personnel should be appointed to check the fastening screws to prevent the formwork from moving. Try to reduce the number of construction, first pour the lower part, then the upper part, then the middle part, and then the two ends, continuously, to avoid steam cracks and ensure that the formwork does not move. The bottom of the pool should be compacted and polished before the initial setting of concrete, so as to obtain concrete with high strength, good crack resistance and light inside and outside.
1 1, concrete curing
When pouring concrete, the humid environment should be kept at 14d to prevent the surface from drying shrinkage cracks due to water loss and reduce the shrinkage of concrete.
12, pool construction
Mainly should prevent the emergence of deformation joints, construction can take the following measures:
1) 425 # slag portland cement should be adopted, and the water-cement ratio should be reduced as much as possible to make the water-cement ratio ≤0.55.
2) If the "post-pouring belt" is set, the width of the post-pouring belt shall be 1.0- 1.2m, and the concrete sections on both sides shall be tongue-and-groove, and the steel bars of the post-pouring belt shall be continuously opened, and the post-pouring belt must run through the whole pool, that is, the pool bottom, roof and all joints shall be set. Generally, the concrete of post-cast strip can only be poured after the concrete is poured on the wall and the temperature is lower than the wall temperature 1.5-3 months. The post-cast strip should be poured with shrinkage compensating concrete (micro-expansive concrete).
13, do a good job in pond irrigation, and prepare for water testing and acceptance. Test the water for a day and night.
14, masonry construction of diversion wall and thermal insulation wall:
1) When laying thermal insulation wall, double-row steel scaffolding for external wall should be set up first, and then the bottom of external wall of the pool is catchy, and the oblique parts are cleaned up. Use C 15 fine concrete formwork to tamp and level, measure out the horizontal line, set up several benchmarks at four corners, straighten the wall reinforcement on the pond wall, water the red brick one day in advance, and mix the construction mortar according to the design mixture ratio, so as to achieve straight masonry and full and beautiful mortar.
2) To build the diversion wall, clean the pool first, and pop up the wall according to the figure. The specific method is the same as above.
15, plastering construction inside and outside the pool.
From the inside out, clean and rinse the bottom of the inner wall of the pool, water and wet the top of the inner wall of the pool, scrape waterproof cement slurry first, then smooth and polish it with 1: 2 waterproof mortar, clean and water the outer wall, and smooth it in layers with 1: 2 cement mortar.
16, composite soil construction at the top of the pond:
The composite soil at the top of the pond should be backfilled in layers along the periphery and the top of the pond to prevent overfilling, and the top analysis surface should be avoided to be strongly compacted.
For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd