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New residential community infiltration water treatment (7)

New residential community infiltration water treatment (7)

  • Categories:Technical Support
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  • Time of issue:2019-09-20 13:21

New residential community infiltration water treatment (7)

VII. Analysis and treatment plan for water seepage through the wall through the basement
 
7.1 Accident characteristics
 
Leakage around the basement through the wall pipe
 
7.2 Cause analysis
 
(1) There is no pre-buried water-stop steel casing or it has been pre-buried, but there is no full-welding water stop ring.
 
(2) Some wall piercing pipes are larger than 500mm in diameter, and the concrete below the pipe is not easy to vibrate and compact.
 
7.3 Processing method
 
(1) Chemical grouting at the water seepage site.
 
(2) Cut off the concrete loose part of the pipe or the lower part of the pipe, rinse it with pressure water, and use the base treatment agent first.
 
(Cement: polymer JSJ latex: water to the channel: 0.15: the right amount of water) evenly coated (brush), and then fine stone concrete (with appropriate amount of polymer JSJ latex)
 
Carefully insert the compact, wet for 7 days.
 
(3) In the root of the wall pipe ≥250mm, the side wall of the shear wall: the façade ≥250mm (outside the new and old concrete interface) with the Meihui waterproof coating and a five-coat reinforcement layer.
 
(4) After setting a 30 mm thick polystyrene protective layer, earthwork backfilling is performed.
 
7.4 Preventive measures
 
(1) The steel casing must be pre-buried, the length of which is equal to the thickness of the concrete wall, and the waterstop ring must be fully welded to both sides of the steel casing. When the concrete wall thickness is greater than 50mm,
 
Two water stop rings are required.
 
(2) During the concrete pouring process, special attention should be paid to the concrete compactness below the pipe.
 
(3) Details of the specific practices (Figure 7).
 
7.5 quality control
 
The steel casing and the water stop ring must be fully welded, and the concrete below the pipe must be carefully vibrated and compacted.

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