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Tunnelling | Start and
Entry seals

Start and Entry Seals
for tunnel boring machines

We offer different Start seals for your tunnel boring machine and the sealing of your starting shaft. These ensures safety when operating your tunnel boring machine (TBM) and especially when starting to bore the tunnel.

Start seals are used to seal the gap between the excavation line of the TBM and the precast tunnel liner. They are mounted on a special steel support frame. SEALABLE has multiple starting seals in our portfolio depending on the diameter of the tunnel and the expected water pressure. Depending on the start seal design they require with screws and bolts or being attached to a C-Channel profile without screws and bolts.

Multiple starting seals can be installed in series to increase watertightness. In this case, the profile joints from one seal to the next should be offset.

The starting seals are easy to install, support from SEALABLE application engineering can also be required on request.

Advantages of starting seals

  • Abrasion-resistant due to high-quality rubber compound
  • High sealing performance
  • Resistant to high pressure
  • Assembly of the ring directly on the construction site possible
  • Safety at the critical moment of the approach


Starting Seal M


Simple and quick assembly with standard fastening rail element

Starting Seal L


Suitable for small to medium-sized TBMs with high performance

Starting Seal XL


Designed for large TBMs and maximum performance at high groundwater pressure

Installation instruction

Below you will find the step-by-step instruction for the installation of starting seals for tunnel boring machines as a PDF download.

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