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  Under normal circumstances, the repair of buried pipes under the city road, inevitably have to "open up the belly" in the pavement, not only affect traffic, but also to bring noise pollution surrounding residents.

  For the first time, a new technology of "pipe-in-pipe" has been used for the first time on a large scale for the first time in the pipeline repair and remediation project on both sides of the New Middle-East River in Hangzhou. There is no need to carry out large-scale excavation on the pavement. Thin new tube, it can form a layer of protective film trap to achieve the repair effect.
  January 13, Hangzhou Drainage Co., Ltd. revealed that the New Middle East River has now completed 10 km of a trunk sewer repair project, is the first sewage pipe lining construction of the longest length, the largest diameter of the type of project.

  The new tube is actually more like a protective film
  Recently, at about 90 midnight on Zhonghe Road under the elevated river, staff members set up shelves near the sewage manhole to play with some white pipes. They are carrying out the second phase of the new Middle East sewer management.
Sewage pipelines along the Middle East are "old stubborn", most of them have a history of more than 20 years. They have a serious aging and many problems of leakage and corrosion, which are one of the major causes of river pollution. The Middle East river remediation, it is necessary to repair the coast of the new sewage system, reduce pollution.

  If according to the traditional old method, it is inevitable that the sealing road has been excavated to replace the old pipe. This time, however, it changed a way to minimize the disturbance of people -"Simply put, is the old pipe does not move, add a new tube in the pipe wall .How to add new pipe? Do not dig the road, first check the wellhead into the sewage, and then pipe inside the irrigation, the use of water The force moves forward, reaches the set position, and heats the water so that the tube will cure and hold in position. "
  Shen Deputy Chief Engineer of Hangzhou Drainage Co., Ltd. introduces this new tube science called resin impregnated hose, very thin, the thickness is generally between 6 mm -18 mm, and the surface is very smooth, will not affect the flow of water. Gives the impression that the old pipe paste a layer of protective film, the old pipe can be "defects" are repaired, valid for 30 years.

  Later, this technology to promote more in urban construction
  Deputy Chief Engineer Shen said that this technology is called overturned in situ curing method of construction technology. Hangzhou took the lead in introducing it as early as 2005. However, for the first time, such a large-scale application of the Middle East River is the first time that a 10-kilometer-long trunk sewer rehabilitation project has been completed in the New Middle East River. It is the first construction of sewage pipe lining in China Longest, the largest diameter of the type of project.

  Last November, Hangzhou Drainage Co., Ltd. editor of the "flip-type curing in situ drainage pipe repair Technical Regulations" passed the provincial housing and Urban and Rural Construction Department of experts review, to fill the gaps in the country.
  "In the future, this technology will be used more extensively in the urban construction of Hangzhou. Its greatest advantage is less traffic impact, fewer disturbances, and less construction time."
  Currently, the second phase of the new Middle East sewage pipe repair works are still underway, focused on the stadium Road - Jiefang Road Zhonghe, about 2 km long, is expected to be completed by mid-March.
  In addition, in the comprehensive protection project of the New Middle East River, which was shown on National Day last year, there are three other roads that are not completed. At present, two tunnels of Jiefang Road and Qingtai Street have been dug through and civil works have basically been completed. After the Spring Festival, renovation work will start.