Choose a reasonable repair method can effectively reduce project costs, shorten the construction period and reduce the negative impact on the environment , traffic . Various mechanic method has its own unique side, there are common basic points can learn from each other through . From that point, the classification of trenchless repair technology electrofusion coupling mould induction, to further understanding and promotion of trenchless repair technology will be beneficial.
A repair method of classification
1, according to the useful life can be divided into temporary and long-term repair ( permanent ) repair ;
2, according to construction methods can be divided into grouting , embedded reinforcing method , coating method, and lined pipe collars law method ;
3, according to the repair site can be divided into point-like repair and overall repair two major categories ;
4, according to the purpose of the repair can be divided into anti-leakage type , corrosion -and strengthen the structure type categories.
Second, the repair methods
By punctate repairs and repairs to the whole division, is a basic method sewer repair technology classification.
1 , point-like many pipeline repair damage only occurs at the interface part of the pipeline , if only to repair the interface , which is called point-like repair (SpotRepair). Point into the interface embedded complement repair , grouting , collar law , local cured resin . Many damaged pipelines lives less than a decade , tube structure intact, but the interface leakage . For this type of pipeline repair using point is reasonable . Early point-like repair method is relatively simple, relying on staff access to repair leaks in the pipe directly , it can only be used over 800mm diameter pipes . ( 1 ) Interface embedded complement
Interface is the application of the first embedded complement trenchless pipe repair technology , first fill material embedded in cement mortar , chiseled after the old joints, finishing with quick dry cement or asbestos cement expansion manually embedded complement . In recent years, chemical materials increased, tar epoxy mortar , polysulfide sealants , polyurethane vinegar began to replace cement mortar. Chemical mould maker seal material has good flexibility , good resistance to deformation than the cement mortar.
Interface embedded complement although cheap , there is no impact on the flow cross-section , but poor quality stability . If staking cleaning is not clean, not dense embedded complement , these human factors can affect the reliability of the repair . In addition , the interface embedded complement duration is relatively long ( 2 ) grouting
Through the tube and interface parts soil grouting , plugging groundwater seepage into the pipeline route is yet another point-like repair methods . According to different grouting materials can be divided into two types of cement grouting and chemical grouting ; according to setting mode grouting pipe can be divided into the tube ( outside ) drilling grouting and ground ( down ) two drilling grouting . Grouting from the ground down there is a big blind should not place more than note the note , the note of the ground ( such as the bottom part of the tube ) is difficult to inject enough .
In recent years, small pipe tube grouting technology has also made great progress. The airbag will be closed on both sides of the interface , and then injected into the joints of chemical pulp , chemical pulp curing water swelling soon after plugging leaks . And other engineering methods compared to the relatively poor reliability grouting . Therefore, its use in the United States and Japan are subject to certain restrictions , such as the requirement to conduct post- grouting visit every six months , or leakage should not use more than a certain amount and so on. Grouting is often used as an adjunct or temporary plugging method of application , generally can not use the law as an independent work . Grouting is usually embedded reinforcing method and interface combined effects of ( 3 ) sets of the Tour de France
Mounting interface sealing collar portion is a common point repair methods . The vast majority of the Tour de France sets quality stability than the embedded reinforcing method is good, and fast construction speed , but the collar method has some influence on the flow. Collar method can be divided into the following categories:
① Antao ring scaffolds can be divided into : ordinary steel rings, stainless steel rings , PVC sleeve ring.
② Press the seal can be divided into : rubber water seals ( ribbon ) , rubber sealing rings ("O" type ) seals , PE water stop seal ( ribbon ) , polyurethane grouting . ③ by way of installation : can be divided into manual installation ( diameter 800mm and above) and airbags plastic injection mould installed ( diameter 800mm or less ) .
Rings have been used :
① ordinary steel rings : steel rings into the 2-3 valve assembly in the tube , collar lined with rubber water in between the main pipe . Pipeline wrong port or interface injustice often affect the sealing effect , ordinary steel rings easily rust.
4 ) partial curing resin
The partial gelling is actually a method for repairing the whole point repair practice , there are two kinds :
① artificial fiberglass Interface : personnel into the tube , embedded interfaces do first up , and then in the interface area to do fiberglass liner.
② local forming felt tube airbags : filling resin coated tube with a balloon felt so close to the main pipe , and then heat cured with ultraviolet light and other methods . Felt barrel shaped balloon partially whole scene is actually a method of curing localized approach.
2, the overall repair
If a pipe repair from start to finish , this is called the overall repair (wholerpair). Overall repair is the entire pipe between two manholes reinforcement repair , this repair can be divided into two categories : one is the coating, and the other is the liner method. Coating method is suitable for the diameter of 800mm or more, anti-corrosion, anti-seepage pipes for the purpose of repair .
Liner can not only repair the pipeline corrosion, seepage and can increase the structural strength of the pipe . Liner construction method is fast , reliable , and therefore has become the mainstream of trenchless sewer repair . But the cost is correspondingly higher loss of some liner construction method is relatively large cross-section of the pipeline .
( 1 ) coating method (coating)
Coating method to enhance the role of the structural strength does not only play a role in anti-corrosion and anti-seepage . Little impact on the pipeline coating method section , the relatively low prices, but long duration, reliability, poor quality , pipeline construction cleaning process , temperature, ventilation , personnel quality will affect the repair quality.
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