Construction steps for grouting and plugging of sewage tank
1. Surface cleaning: clean the concrete surface about 10cm around the crack to find the position of the crack and the water source.
2. Slotting or drill hole : used at 3cm left and right of the seepage gap cutting machine Cut 6-8cm deep seam to prepare for grooving.
3. Chiseling: the height of the upper layer is 8cm manually（ Construction joint ）Or 6cm (lining crack) groove, generally chisel into inverted trapezoidal groove with large inside (6cm) and small outside (4cm) to ensure that the external waterproof layer is 2-3cm thick.
4. Embedded grouting pipe: for Water pipe For water leakage between the tunnel and the buried casing joint, first chisel the leakage point with a height of no more than 70mm. After washing with water, install hemp rope, and then use plugging materials to plug and embed 1-2 grouting pipes for diversion.
5. Grouting: inject grout from the grouting pipe after the waterproof mortar of the plugging material reaches a certain strength; The grouting effect shall be judged according to the grout flowing out of the corresponding grouting pipe nearby, and the grout shall be filled with gaps and evenly distributed; The grouting pressure is controlled at 0.3-0.4MPa, which is generally determined through on-site testing; After grouting is completed, Laiwu sewage pool leakage water plugging and maintenance shall be fastened with iron wire at the grouting pipe orifice to prevent grout from flowing out; After the grout hardens, cut off the grouting pipe.
6. Brush mortar for leveling: after the waterproof mortar reaches a certain strength, spray wet the repair area, brush 1:2 ordinary mortar for leveling, with a thickness of 0.5-0.8cm.
7. Curing: spray water curing within 3 days.
In the construction, it is easy to fail to control the local details properly, and the construction quality problems occurred in the leakage plugging and maintenance of Laiwu sewage pool, and the leakage problem occurred after use. In view of this situation, when plugging the leakage, we should first conduct leak point detection, and then make targeted leakage repair. Now, let's learn about it.
1、 Causes of leakage in large sewage pool
1. The construction joint is not properly reserved, which is mainly reflected in that the construction joint at the junction of the bottom plate and the wall is left in the vertical construction joint of the bottom plate and the wall;
2. The construction joints are not cleaned, and loose particles and cement films are not removed;
3. The formwork at the joint is not dense, causing slurry leakage;
4. When pouring concrete, the construction joints are not paved;
5. Improper feeding and concentrated concrete coarse aggregate;
It is one of the comprehensive enterprises integrating research and construction. It has more than 40 years of construction experience. In recent years, it has introduced advanced waterproof plugging technology and high-pressure grouting equipment from abroad, constantly improved the waterproof plugging construction technology, and innovated the plugging technology. It is also used to control the leakage of various underground projects, especially the leakage of cracks in mass concrete, tunnel engineering, settlement expansion joints With many years of successful maintenance and handling experience, and the ability to prevent water leakage with high difficulty, you are the relevant person around you! Construction achievements spread all over the country
1、 Leakage causes of tunnel deformation joints (including expansion joints, settlement joints, construction joints, and junction joints):
(1) The design reason is the lack of effective waterproof design combined with specific conditions for special parts with special functions and in special environment, such as deformation joints and other detailed structures, resulting in leakage at these parts.
(2) The selected material does not meet the deformation requirements due to material reasons or the performance of caulking material is poor
(3) Construction reason The waterstop was not constructed as required, and the caulking and sealing materials were not constructed as required.
