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Underpass Expansion Joint


EGIS Joint [Co-Development Technology with Korea Land & Housing Corporation]

Construction Method Overview
It's construction method to use high molecular reforming asphalt which is containing natural rubber and TPO synthesis resins, and it is the most economical construction method to absorb vibration and impact weight of vehicle and has an excellent induced drain ability and does not occur reflection crack due to not using iron plate.
Construction Method Characteristics
Problem of convetional expansion joint for underpass driving surface
1. Pavement Layer Corlating Water Stay

When rain water percolates into pavement layer of pavement, it reaches the portion of expansion joint along Slab according to the slope. At this time, because concentration power of aggregate becomes weaker, seperation phenomenon of aggregate during vehicle driving, it proceeds to Pot-Hole and causes bad effect toward vehicle driving.

2. Underground Water Leak

It occurs occasionally underground water leakage due to waterproof layer damage via tertiary external cause in structure waterproof and due to minute pore generation in waterproof sheet construction. At this time, it contains safety accident hazards because of hydroplaning in summer time and dew condensation, ice formation in winter time.

3. Crack & Pot-Hole Generation

Iron Plate Installation

In aggregate deposition, iron acts as preventor to block aggregate into expansion space, but it generates up-and-down movement of iron plate by wheel load of vehicle due to stepped difference which is generated by concavo-convex problem on concrete Slab surface and differential settlement. And it also generates corrosion with moistness from temperature difference of cold iron plate property and finally comes to occur volumetric displacement of expansion joint portion.

Expansion Joint Uninstallation (Asphalt Pavement)

Expansion Joint Uninstallation (Concrete Pavement)

Complementary Contermeasure of convetional expansion joint for underpass driving surface
1. Slab Drain

Slab drain is installed in the space of percolating water stock and leaked underground water, and to drain induced water for percolating and underground leakage water.

  • Slab Drain Pipe Installation

  • Slab Drain Pipe Installation Completion

  • Leakage Water Induced Drain

  • Percolating Water Induced Drain

2. Complementary textile (Glass Fiber)

Supporting subsidiary material is incorrodible and to use permanently. It uses complementary textile (Glass Fiber) with flexibility which is able to accept concavo-convex and deflection of concrete Slab.

  • Complementary textile Installation
    LMC Pavement Expansion Joint

  • Complementary textile Installation
    HPC Pavement Expansion Joint

  • Complementary textile Installation
    Concrete Pavement Expansion Joint

  • Complementary textile Installation
    Asphalt Pavement Expansion Joint