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TECHNOLOGY

Co-injection molding steel pipe

Overview of Multiple (Simultaneous) Grouting Methods

This method is an excellent method in terms of economy as it can shorten the construction period
by selectively integrating the steel pipe with the surrounding ground and forming a beam arch in the form of an umbrella,
and obtaining the secondary and reinforcement effects (bending and shear) simultaneously through the inner pipe installed
in the steel pipe without sealing work after installing the steel pipe with a specially manufactured multi-(simultaneous) grouting injection
device in an appropriate shape at the factory before tunnel excavation.

Multiple (simultaneous) steel pipe structures and System

Multiple (Simultaneous) Steel Pipe Bulkhead Installation Structure

Features of the method

Type Multiple (Simultaneous) Grouting Methods Traditional multi-step grouting method
Method overview
  • - A method of inserting and caulking a steel pipe with a factory-made multi-grouting injection device after drilling, and performing simultaneous or selective pressure grouting by installing a specially made partition packer inside the steel pipe without separate sealing work.
  • - A method that inserts reinforcement after drilling, caulks the opening, injects seal material into the gap between the drilled hole and the reinforcement, and performs multi-stage pressure grouting using an air packer or hydraulic PAcker.
Stiffeners
  • - Large Diameter Tunnel Reinforcement [Φ114.3mm,6T]
  • - Small Bore Tunnel Reinforcement [Φ60.5mm, 4T]
  • - Large Diameter Tunnel Reinforcement [Φ114.3mm,6T]
  • - Small Bore Tunnel Reinforcement [Φ60.5mm, 4T]
Strengths
  • - No sealing application time and curing time required
  • - Air reduction with co-injection steel pipe
  • - Environmentally friendly, mineral-based injectables
  • - 2Mpa strength after 4 hours
  • - Visual monitoring of infusion pressure, infusion volume
  • - The price per space is low
  • - Lots of examples
  • - Easy to make steel pipes
Construction order Drilling → Reinforcement insertion → Caulking → Simultaneous injection, selective injection for each SETP Drilling → Inserting reinforcement → Caulking → Sealing → Installing air packer → Multi-stage injection for each SETP
Features
  • - The steel pipe's internal injection tube is matched with the reinforcement to act as a reinforcing bar, increasing the stiffness of the reinforcement
  • - Factory manufacturing of steel pipes and packers in steel pipes eliminates the need for a separate packer installation process on site, thus reducing air consumption.
  • - By applying the multi-(simultaneous) injection method to the shortcomings of the existing process, the sealing work process is not required, and the process is simple and can be injected immediately at the desired time, so the air reduction effect is large.
  • - Easy to install and high construction quality.
  • - Injected sealant, which is an additional process
  • - Injected using Air Packer and by installing Packer from the bottom up.
  • - Rich in construction history

Tubular Model by System Type

4Line 4Step
2Line 4Step
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