JES Method

Method overview

• Because this method places PS steel materials higher than the effective height of members in the form of external tendon (cable) at the top of the low tower in the bridge upper structure, axle force and moment are introduced and efficiently reduce the force of member created at the upper sectional area

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Method features

• (1) Makeshift elements are used for main body structure.
• (2) Safe and almost zero subsidence effect by using square shied machine in element digging.

Construction method

• Apply tension on the PC strand settled in excavation equipment with tow machine installed at the arrival side, and insert the JES element, that has joint unit connected to the excavation equipment, from the launching side.

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Application cases

• Domestic
  • Over road bridge improvement construction in the Gyeongui Line (6.17x3.89x23.0, 2 places)
  • Apply the basic design of double track railway between Byjeong-Masan in underpass section of the Gyeongbu Line (45m)
• Foreign (Japan)
  • Goyacheon B reconstruction between the North east main line and Amjeol (27.07x6.68x12.82) and other 38 cases