Leakage repair of underground powerhouse of hydropower station, The waterproof grade of the basement of the project is Grade II, and three layers of waterproof are adopted. The floor and exterior wall are rigid waterproof with C30S8 waterproof concrete, and two layers of 3mm thick external waterproof are applied SBS Type III modification asphalt Waterproof roll (Flexible waterproofing), the peripheral backfill adopts 2:8 lime soil three layers of waterproofing. In order to ensure that the basement waterproof is foolproof, we should take every waterproof seriously. Compilation basis: Unified Standard for Construction Quality Acceptance of Building Engineering (GB 50300-2001), Code for Quality Acceptance of Underground Waterproofing Engineering (GB 50208-2002), Code for Construction Quality Acceptance of Concrete Structure Engineering (GB 50204-2002), Code for Construction Quality Acceptance of Building Ground Engineering (GB 50209-2002), Code for Indoor Environmental Pollution Control of Civil Building Engineering (GB 50325-2001) Great Wall of Building Structure cup Project Quality Review Standard (DBJ ／ T01-69-2003) Basement plugging base requirements: (1) Trench inspection: the foundation trench has passed the acceptance of the design, survey, owner, supervisor and other units, the base treatment meets the design requirements, and the concealed acceptance records have been handled (2) Setting out and leveling: according to the measurement and positioning control line, set out the cushion sideline and the position line of Houjiang belt. (3) Make elevation control points: according to the design elevation, use cement Make several elevation control points in the middle of the mortar. Requirements for leak stopping materials in basement: (1) The project adopts premixed concrete and pump pouring; When signing the concrete supply contract with the concrete company, the following technical requirements for waterproof concrete are proposed as part of the contract: a Concrete grade: C39S8b Slump: 100-140mmc Initial setting time: 4-6 h, d. Control requirements for alkali aggregate: large chloride ion content 0.2%, large alkali content 3.0 kg/m3. (2) Before concrete mobilization, the concrete company shall provide concrete mix proportion notice, calculation sheet of chloride ion and alkali content, concrete setting curve table and other data, which can be officially poured after being reviewed by the project chief engineer and supervision engineer. (3) Control the quality of concrete entering the site: after the concrete enters the site, check the time of concrete leaving the machine in a timely manner, make a record of the time of starting pouring and finishing pouring, and ensure that the concrete is poured before the initial setting. During pouring, the tester shall check the slump of each truck of concrete entering the site, make records, and withdraw the unqualified concrete from the site. Quality acceptance of basement plugging (1) Division of inspection lot: confirm the division of inspection lot and inspection quantity with the supervisor before acceptance. According to the specification requirements: spot check every 100m2 of exposed concrete area, 10m2 for each place, and no less than 3 places; Check all details. (2) Acceptance: see the section Management Assurance System and Quality Management Measures for details. (3) Inspection of technical data a. Concrete certificate, impermeability test report and alkali content report provided by the concrete company.
Leakage repair of underground powerhouse of hydropower station, The leak stoppage company * * * is engaged in waterproof leak stoppage, leak stoppage with water, leak stoppage in underground garage and other engineering construction. Based on years of waterproof construction experience, the company adopts different construction schemes when dealing with water leakage in structural joints, construction joints, sewage pools, ground pools, pipes, mines, etc., and decides to use the back water back pressure leak stoppage method according to the actual site survey. Ensure that there is no leakage at the plugging point. Get the praise of customers! The company is willing to serve all owners with years of rich experience in leak stoppage construction, * * * technology, * * * management, and * * * service, and wholeheartedly provide customers at home and abroad with products that are satisfactory, ideal, and beneficial.
Infiltration construction scope:
1. Construction settlement, expansion joints and cracks at the bottom of the pool of expressway crossing the river and ground * * * tunnel works.
2. Leakage plugging construction of concrete structures such as underground foundation construction works, subway works, civil air defense works, sewage treatment pool, etc.
3. Water seepage and leakage stoppage construction of various underground works such as basement, underground garage, underground passage, thermal pipeline, foundation pit, etc.
4. Construction of construction joints of water pool, cable trench pit, mine passage, elevator shaft and foundation pit works for leakage plugging with water.
5. Leakage treatment and plugging construction of concrete structure, cooling cooling tower circulation channel, pipeline, sewage treatment pool project.
6. Leakage control and plugging construction of culverts, open caissons, pump houses, dams, bridge decks, roofs, tunnels, water intake and drainage works.
7. The grouting of reservoir dam body of water conservancy projects, the leak stoppage and seepage prevention of water conveyance tunnel cracks, and the seepage prevention and reinforcement of dam concrete cracks.
Construction process of plugging:
1. The joint shall be chiseled according to the quantities of * * * required by Party A.
2. Clean the leaking parts and chisel the leaking joints into U-shaped joints.
3. Milling the leakage joint, embedding the bamboo joint, cleaning the leakage joint, filling the plugging material, installing the suction pipe and bamboo joint (grouting nozzle).
4. Diversion, decompression, reduction of water flow, control of water leakage points, change large water flow into small water flow, and make small water flow out of the installed diversion pipe.
5. Ingredients: several reagents are mixed into two groups of mixed slurry, and the setting time of ingredients is determined according to the amount of water leakage.
6. Back pressure grouting: the pressure of grouting must be greater than the pressure of water leakage, so that the water can be pushed back and infiltrated into the capillary joints of the leaking rock. When encountering water, it will expand and set quickly to achieve long-term deep water stop effect.
7. Dig out the bamboo knots (or not) and fill them directly with plugging materials.
8. After surface treatment and no leakage through self inspection, the surface slurry shall be scraped flat.
