Guidelines to success of the track doubling project (Jira-Khon Kaen railway junction) by method of construction a railway underpass using Box Jacking

Abstract

Method of constructing a railway underpass using the Box Jacking method. It is the main factor affecting the success of the Jira-Khon Kaen double track railway construction project which has been completed as intended. It is the first project in Thailand to develop a railway underpass construction technique using the Box Jacking method. which trains can pass at a speed of 20 kilometers per hour while pushing through under a railway,  then no need to wait for a new track for bypass a trains. This saves time / reduces costs and is beneficial for laying 80-pound railroad tracks faster than the traditional plan that uses the method of open-cut the embankment. The construction management for 76 Box Jacking and work/calculating the jacking force used for pushing the box underpasses.  In the soil layer of the northeastern region (Loess Soil). For designing/calculating and building drill heads, size 2.7 m x 2.8 m., 3 machines, size 3.7 m x 8.65 m., 2 machines, and size 4.35 m x 8.9 m., 2 machines. Including changing the fixing support of 8 Number of 100-ton double-acting hydraulic cylinders. Which is taken from a Kawasaki tunnel boring machine (Earth pressure balance) of the Blue Line Extension Project (Contract 2) that has the end attached to the concrete floor (Thrust Bed) in an off-center manner, is a type that pushes axially against the concrete wall (Thrust Wall). Makes it possible to control the direction of movement of the box underpass both vertically and horizontally according to the requirements. By creating a hydraulic system that can be controlled remotely with a wireless remote control.