Construction scheme of pool pumping station
A, pool construction process:
Measuring unreeling → earthwork excavation → concrete cushion construction → unreeling H→ steel binding H→ retaining embedded parts → acceptance → formwork support H→ concrete pouring s → concrete calendering → concrete curing.
1. Measuring unreeling
Measuring instruments: total station, meter ruler.
According to the construction drawings, the control pile is led out, and the axis and sideline of the foundation pit are released by the control pile. ?
2. Earthwork excavation
Because the ground of the pump house is concrete pouring ground, the ground is cut with a cutting machine according to the released line, and then the concrete on the ground is broken with an electric hammer to clean the concrete, and the foundation pit is excavated manually. During earthwork excavation, the excavation elevation and excavation scope should be controlled with the excavation. Earthwork excavation shall be carried out in strict accordance with the requirements of design drawings, and no overbreak is allowed. Due to the narrow space of the pump house, the soil will be cleaned immediately during excavation.
3. Concrete cushion construction
Construction of lime-soil cushion: according to the requirements of construction drawings, after earthwork excavation, the foundation of the pool should be padded with lime-soil, and the thickness of lime-soil should not be less than 300mm below the foundation. The specific requirements are as follows: ① Treatment scope: each side of the outer edge of the foundation is enlarged1.0m; ② Material requirements: Lime should be fresh hydrated lime and sieved. Silty clay should be used as the soil material with a particle size of not more than 5mm, but lump clay and sandy silt should not be used and should not contain soft impurities, and should be sieved, and its particle size should not be more than 15mm③ Quality inspection of lime-soil cushion: when the circular knife method is used for inspection, the sampling point should be set at 2/3 depth of each layer, and each layer should have three inspection points. The sampling point shall be located in the middle of each layer, with a distance of 150-300mm from the edge. The compaction coefficient of each layer of lime soil is required to be not less than 0.97. The construction inspection of lime-soil cushion must be carried out in layers. After the compaction coefficient of each layer meets the design requirements, the upper lime-soil shall be laid. (4) The foundation pit is laterally backfilled with 3:7 lime soil, and the compaction coefficient is not less than 0.93. Dust.
After the lime-soil cushion construction is completed and accepted, concrete cushion shall be poured according to the design elevation. Before concrete pouring, the chute of concrete pumping route should be set on site. After the pump truck arrives at the site, it should check whether the concrete receiving is required for C30 concrete pouring, whether the delivery time of pumped concrete exceeds 2 hours, and whether the concrete slump measured on site meets the requirements, and make standard test blocks and test blocks with the same conditions for inspection. When pouring concrete, the concrete must be vibrated and compacted. After the concrete has solidified to a certain strength, the next step of construction can be carried out.
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Setting-out: under the condition that the strength of the cushion can ensure the master control, the elastic line of the reinforcement laying position is carried out, and the width is 1500mm.
Pop-up the position and elevation line of steel plate embedded parts.
5. Reinforcement binding process: According to the inspection record of reinforcement, lay the bottom reinforcement → put it into the beam stirrup → bind and fix it → lay the surrounding reinforcement while binding and fixing it → lay the upper reinforcement → bind and fix it → place the concrete cushion block.
The reinforcement at the bottom of the reservoir and the wall of the reservoir shall be bound. The steel bars are arranged in a double-layer bidirectional way, and the horizontal hoop is welded on one side. Lap length should not be less than 10d. The protective layer thickness of the innermost and outermost reinforcement shall be 40mm for the bottom plate, 30mm for the top plate and 40mm for the tank wall. Between the two layers of steel bars inside and outside the vertical wall, a Ф 6 brace is set every 600mm in the horizontal and vertical directions. When steel bars encounter holes less than 300mm, they should be bypassed as far as possible.
6. Reserved embedded parts: According to the position and elevation line of the popped-up embedded parts of the steel plate, put the steel plate aside, spot weld the steel bar at one side not less than 10d, and fix it firmly. Q235 steel is selected for embedded iron parts and ladders. Exposed iron pieces shall be painted with red lead primer and brushed with ready mixed paint twice.
7. Acceptance: "Self-inspection, mutual inspection and handover inspection" shall be carried out after steel bar binding is completed. After passing the inspection, the project quality supervisor will organize the supervision engineer to go to the site to accept the steel bar model, binding spacing, lap anchorage length and spacing, etc. Only after passing the inspection can the next working procedure be carried out.
8. Erection of formwork: Erection of formwork can only be carried out after the steel bar binding is qualified. The formwork is made of bamboo veneer as the surface layer, square timber as the back rib, bowl buckle and jacking as the support and fixation, and the nipple is made of steel pipe or φ 25 steel bar with the same cross-section size as the internal support, so as to ensure that the pouring cross-section size does not deviate, and the slab joints meet the specification requirements, so as to prevent a large number of slurry leakage from affecting the concrete pouring quality.
9. Concrete pouring: Before concrete pouring, the chute of concrete pumping route shall be set on site. After the pump truck arrives at the site, it should check whether the concrete receiving is required for C30 concrete pouring, whether the delivery time of pumping concrete exceeds 2 hours, whether the concrete slump meets the requirements on site, and make standard test blocks and test blocks with the same conditions. When pouring concrete, the concrete must be vibrated and compacted. After the concrete has solidified to a certain strength, the next step of construction can be carried out. Anti-rust agent, epoxy resin layer reinforcement or other corrosion-resistant reinforcement can be used for concrete structural members, and cathodic protection measures can be taken.
10. Concrete calendering: before the final setting of concrete, the surface shall be polished and leveled, the elevation line shall be re-measured, and the leveling shall be done by scraping the bar.
1 1. Concrete curing: After concrete pouring is completed, it is necessary to strengthen the curing, and cover and water it within 12 hours. When the average temperature is below 5 degrees, no watering is allowed, and heat preservation measures are taken, and cooling measures should be taken under high temperature weather conditions.
12. After form removal, the pool must be filled with water immediately, and it is forbidden to expose to the sun. The concrete surface should be covered to prevent sun exposure or cold wave attack, and the curing time should be kept until it is used (to avoid the pool being filled with water in winter).
13. Before plastering the pool, do a full water test, and inject water in three times, each time to the design depth 1/3. After each filling, observe and measure the leakage factor for 2 days, and the 24-hour leakage rate should be less than 2l/m2 d. According to the observed leakage, repair it according to the specific situation.
14. acceptance: after the construction is completed, it shall be reported to the supervisor for acceptance on the basis of self-inspection, and the follow-up work shall be carried out after the acceptance is qualified.
Second, the pumping station building materials
The wall and bottom plate of the pumping station are made of C30 commercial concrete, with the impermeability grade of S6, and the back cover is made of C25 concrete. The strength grade of other concrete inspection wells is C20, and the strength of cushion is 0. 1m thick C 10 concrete.
1. Upper structure and decoration of pumping station
Concrete strength of rectangular columns below 3m and rectangular beams below 2.7m in the pumping station adopts C25 concrete. The solid brick wall is 240mm thick and 3m high, and it is built with MU 10 porous brick M7.5 mixed mortar. The ground cushion of block building is C 15 concrete, 100 thick, the leveling layer is 20 thick 1: 4 hard cement mortar, the bonding layer is pure cement slurry, and the surface layer is 600*600 polished tiles. Interior wall plastering bottom layer thickness 18, thickness 1: 3 lime mortar.
2. Pipeline foundation
Steel pipe foundation should be paved with medium coarse sand or fine gravel, and the foundation thickness is 20cm. The pipeline foundation of drainage pipe and water supply pipe adopts sand foundation.
Pipeline interface: steel pipe interface welding; The drain pipe interface adopts socket connection, rubber ring seal, and the water supply pipe interface adopts hot melt connection.
3. Corrosion protection of steel pipes
Before or after installation, all steel members and pipe fittings must be treated with anticorrosion. Before anti-corrosion construction, the pipeline components should be pretreated to remove the oil stain, dust, welding slag and floating rust on the inner and outer walls of the workpiece, so as to be clean and pollution-free. Sand blasting is adopted to remove rust, and its quality standard should reach St3 level. After the completion of anti-corrosion construction, coating inspection and electric spark test should be carried out.
(1) Buried steel pipe anticorrosion
External anticorrosion treatment adopts heavy anticorrosion. GZ-2 polymer anticorrosive coating is adopted, and it is anticorrosive according to four oils and two cloths, that is, primer+fiber cloth+primer+fiber cloth+primer+topcoat.
(2) External corrosion protection of exposed and underwater steel pipes
External anti-corrosion is to strengthen anti-corrosion treatment, using GZ-2 polymer anti-corrosion coating, according to two cloth and four oils.
(3) Corrosion protection of pipelines
GZ-2 polymer anticorrosion coating is also used for pipeline anticorrosion treatment.
4. Pipeline laying
(1) Drain pipes and sewage pipes
UPVC drainage pipes are used for laying drainage pipes, and UPVC sewage pipes are used for laying sewage pipes. The buried depth is 0.7m, and the interface forms are all rubber ring interfaces.
(2) Laying water supply pipeline
PE water supply pipes are used for laying water supply pipes, with a buried depth of 0.8m and bonded interfaces.
3. Concrete cushion construction
Construction of lime-soil cushion: according to the requirements of construction drawings, after earthwork excavation, the foundation of the pool should be padded with lime-soil, and the thickness of lime-soil should not be less than 300mm below the foundation. The specific requirements are as follows: ① Treatment scope: each side of the outer edge of the foundation is enlarged1.0m; ② Material requirements: lime should be fresh hydrated lime and sieved. Silty clay should be used as the soil material with a particle size of not more than 5mm, but lump clay and sandy silt should not be used, and soft impurities should not be contained, and should be sieved. The particle size should not be greater than 15mm③ Quality inspection of lime-soil cushion: when the circular knife method is used for inspection, the sampling point should be located at the depth of 2/3 of the thickness of each layer, with 3 inspection points for each layer. The sampling point shall be located in the middle of each layer, with a distance of 150-300mm from the edge. The compaction coefficient of each layer of lime soil is required to be not less than 0.97. The construction inspection of lime-soil cushion must be carried out in layers. After the compaction coefficient of each layer meets the design requirements, the upper lime-soil shall be laid. (4) The foundation pit is laterally backfilled with 3:7 lime soil, and the compaction coefficient is not less than 0.93. Dust.
After the lime-soil cushion construction is completed and accepted, concrete cushion shall be poured according to the design elevation. Before concrete pouring, the chute of concrete pumping route should be set on site. After the pump truck arrives at the site, it should check whether the concrete receiving is required for C30 concrete pouring, whether the delivery time of pumped concrete exceeds 2 hours, and whether the concrete slump measured on site meets the requirements, and make standard test blocks and test blocks with the same conditions for inspection. When pouring concrete, the concrete must be vibrated and compacted. After the concrete has solidified to a certain strength, the next step of construction can be carried out.
Third, safety measures
1. Safety management measures
(1) Establish various rules and regulations, safe production responsibility system, safe production operation procedures for each type of work, and mechanical safety operation procedures.
⑵ Six disciplines of safety in production must be observed when entering the site.
(3) Conscientiously implement the policy of "safety first, prevention first", adhere to the principle that safety must be managed in production, conscientiously implement the relevant safety production regulations, and adhere to the safety technical disclosure system.
(4) Before construction, conduct safety publicity and education for all personnel involved in the project construction, organize employees to learn the laws, regulations and operating procedures on safety production issued by the State Council, the city, the Ministry and the company, and require employees to strictly abide by the provisions of relevant documents in the production process.
5] Before and during construction, always check the safety performance of equipment on the construction site. Equipment or facilities that have not been accepted by the relevant departments are not allowed to be used. The places that do not meet the safety requirements should be rectified immediately, and safety barriers and warning signs should be set up at the construction site.
[6] Strictly implement the approved construction organization design and the requirements of partial safety technical measures for construction, and the operators must strictly observe their posts and perform their duties; Observe the safety operation rules; Special types of work should be trained and certified; Safety officers at all levels shall conduct safety inspection every day to stop illegal operation and illegal command.
Once adhere to the "three guarantees" system, you must wear a safety helmet when entering the construction site, wear a safety belt when working high above the ground, and set a fully enclosed safety net for scaffolding.
Being flammable and explosive goods piled up in accordance with the relevant provisions, strict implementation of hot work examination and approval system, level 1, 2, 3 hot need to be approved by the relevant departments. ?
Levies to do a good job of rain, lightning and wind prevention.
⑽ Summer construction should pay special attention to heatstroke prevention and cooling, set up medical points, and equip them with first-aid medicines.
⑾ Designate a special person to manage the mechanical and electrical equipment and electrical lines at the site, implement the listing system, and maintain the mechanical and electrical equipment according to the company's maintenance system. Combine regular inspection with regular comprehensive inspection to prevent electric leakage from hurting people. ? ⑿ The construction site is divided into safety areas: pedestrian safety area, work area and living area.
2. Technical measures for safe construction
1. Safety measures: Scaffolding and construction on scaffolding are strictly prohibited above category 5 wind; Wear safety helmet, safety belt and non-slip shoes when working on the shelf; There must be more than two guardians at the scaffold operation site; Two access ramps are arranged on both sides of the frame body; UPVC pipes must be worn when installing wires on the frame. Removal of scaffolding; Before dismantling scaffolding, it must be approved by the project manager or foreman, otherwise no one may dismantle scaffolding and pull nodes without permission.
Scaffolds must be thoroughly inspected before dismantling, and those that need reinforcement must be reinforced in time; Make a detailed disclosure to the operators. Dismantle the fence, monitoring signs, etc. ; Construction before demolition, construction before demolition, top-down, and circular demolition.
Safety protection measures? (1) All construction personnel must receive admission education and take up their posts after passing the examination. ? (2) It is forbidden to wear high heels, slippers, spiked shoes and safety helmet on the construction site. ? (3) aerial work personnel must have regular physical examination.
3. Safety protection measures
(1) All construction personnel must receive admission education and take up their posts after passing the examination. ? (2) It is forbidden to wear high heels, slippers, spiked shoes and safety helmet on the construction site. ? (3) aerial work personnel must have regular physical examination.
A scheme that can successfully complete the project needs to consider many aspects, and the construction scheme of pool pumping station mainly considers the construction of pool and pumping station. If the construction of the two is not well completed, the pool will not be used normally, which may require more manpower and material costs, and eventually the loss will increase. Therefore, a complete construction scheme is very important. I hope the above content shared by Bian Xiao can help everyone in the construction of pool pumping station.
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