Thrust Restrained Joints

     Traditionally, portable water and sewage pipes are buried under the varied ground condition. The surrounding conditions often affect the performance of joints. It would cause leakage by settlement. Moreover, there are a lot of disadvantages of the general flanges and joints welded at the site, so the service life and application of pipes are somehow limited. The solution can be found by using the Thrust Restrained Joints. The products have the advantages of resisting earthquake, flexible, and easy-assembly. The quality and the scope of application would be enhanced greatly.

　

The Features of Thrust Restrained Joints    

  • Simple construction:

The basic components are rubber rings and lock blocks. The structure is quite simple, and have the characteristic of easy processing and high stability.
  • Watertight:

The spigot-bell ring are made by expanding and lathing method. The precision of diameter is high and anti-leaking is 100% ensured.
  • Good Thrust-Restrain Ability:

Except the function of usual fluids conveying, the structure of the Axial Force Resistant Joints also offer the function of axial and radial restraining similar to welding.
  • Good Seismic resistance:

This joints can sustain the stress and settlement of earth during the earthquake.
  • Time Saving:

Without the traditional welding and flanges locking method, this could solve the problem of bad welding quality and coating damage.
  • Good External and Internal Loading Capability:

The steel pipe couplings are designed with radial lock that can solve the problem of partial deformation.
  • Immediate Test:

The leakage test can be done right after the installation (connected with the water pressure hole) which could avoid the problem that leakage happens during pipe line commissioning.
  • No Thrust Blocking:

With the ability of resisting axial forces, the thrust block can be omitted or minimized.

　

Assembling Method     

     The joints are bell and spigot types. The two pipes are tested right after connecting. it is 100% guaranteed watertight. It only requires the dropping of lock blocks. Since welding and bolting is not necessary, the working site and time of installation is minimized. It is easy to disassemble by taking out the lock blocks from the bottom of the pipe.

　

Applications  

Applied Occasion

Applied Function

Steel pipes, PCCP (Pre-stressed Concrete Cylinder Pipe)

Performance promoted

Pipes in the seismic area

Thrust-Restrain, high external load capability

Pipes in the tunnels

Thrust-Restrain, backfill pressure resistance, no welding, pre-test the water pressure

Pipes that can't be damaged, such as pipe lined PE

No welding

Pipes under the high way with heavy vehicles passing through

Thrust-Restrain, no welding, high external load capability, minimized working site, quick construction, no stabilized table

Pipes under the unstable soil

Thrust-Restrain, high external load capability, quick construction

Piping needed to be installed within short time period

No welding, minimized working site, quick construction

Other application by special constructing method

Replacing mechanical couplers and flanges

　

Leakage-free Testing 

Pressure testing 10kg/cm2 The PCCP is pulled up from the side of the Trust restrained Joint under the inner pressure 10kg/cm2.

After φ1000 pipes are connected, one end bulkhead is lifted without thrust block, the test of leakage-free is proved to undertake the pressure to 10kg/cm2.