Tunnel Segment Gasket

Rubber Waterstop Strip
2019年3月28日
Lead Core Seismic Isolation Rubber Bearing
2019年3月28日

Tunnel Segment Gasket

Tunnel Segment Gasket

Tunnel Segment Gasket, also called of shield segment sealing rod, is one of the most effective waterproof material for joint of segment assembly under shield tunneling construction. According to its function, tunnel segment gasket can be classified into elastomeric gasket type, hydrophilic gasket type and compound of elastomeric and hydrophilic gasket type.

Tunnel segment gasket is made of extruded EPDM Elastomeric tunnel segment gasket porous type

Tunnel Segment Gasket Types

  • Elastomeric tunnel segment gasket

Elastomeric tunnel segment gasket is made of neoprene rubber(CR) or EPDM rubber. Cause EPDM rubber has strong chemical stability, electrical insulation, excellent weather resistance, water resistance and ozone resistance, at the same time, porous type gasket can reduce the compressive stress during assembly and prolong its service lifetime. So that EPDM tunnel segment gasket with porous type is the main materials used for sealing water of assembled tunnel segments at home and abroad.

Physical Performance of Elastomeric Tunnel Segment
Gasket

Item

Index

CR

EPDM

Ⅰ Type

Ⅱ Type

Hardness(Shore A)/Durometer

50-60

50-60

60-70

Hardness Deviation/Durometer

± 5

± 5

± 5

Tensile Strength/MPa??? ≥

10.5

9.5

10

Elongation at Break/%??? ≥

350

350

330

Compression Set/%

70℃ × 24 h, 25%? ≤

30

25

25

23℃ × 72 h, 25%? ≤

20

20

15

Hot Air Aging

70℃ × 96 h,

Hardness Change/Durometer?? ≤

8

6

6

Decrease Rate of Tensile Strength? ≤

20

13

15

Decrease Rate of Tensile Strength? ≤

30

30

30

Grade of Mildew Proof

Not less than grade 2

Not less than grade 2

Not less than grade 2

Ⅰ Type is without hole type gasket, Ⅱ Type is with
hole type gasket

  • Hydrophilic tunnel segment gasket
Physical Performance of Hydrophilic Tunnel Segment
Gasket’s Rubber Compound

Item

Technical Index

Hardness(Shore A)/Durometer

42 ± 10

45 ± 10

Tensile Strength/MPa??? ≥

3.5

3

Elongation at Break/%??? ≥

450

350

Volume Expansion Rate/%??? ≥

250

400

Repeated immersion test

Tensile Strength/MPa ≥

3

2

Elongation at Break/% ≥

350

250

Volume Expansion Rate/% ≥

250

300

Bending at Low Temperature (-20℃ ×
2 h)

No Cracks

No Cracks

 

  • Compound of elastomeric and hydrophilic tunnel segment gasket

This type of tunnel segment gasket is consisted of extruded rubber with a hydrophilic sealing insert. The cell structure allows the gasket to be compressed as the segments are installed and pushed together during installation of a lining ring. And hydrophilic sealing inserts will swell automatically in contact with moisture or water. So this type of tunnel segment gasket has excellent water stopping performance.

The elastomeric part shall confirm to the elastomeric tunnel segment gasket physical properties. Hydrophilic sealing insert shall confirm to the hydrophilic segment gasket physical properties.

Tunnel Segment Gasket Section Type

Type Specification Section View
BL-1 47*16.5
BL-2 47*16.5
BL-3 47*19.5
BL-4 35*17
BL-5 35*20
BL-6 22*10.5

 

Tunnel Segment Connecting Corner

BAOLI produce the connecting corners according to each tunnel segment gasket.

 

Tunnel Segment Gasket Production

Machine for making tunnel segment gasket Tunnel segment gasket through cooling system

Tunnel Segment Gasket Production Packing

Tunnel segment gasket before packing Tunnel segment gasket marks
Tunnel segment gasket in roll Tunnel segment gasket on wooden pallet

Tunnel Segment Gasket Application

  • Tunnel
  • Culvert
  • Subway
  • Infrastructure project
  • Water conservancy project
  • Underground constructions
Tunnel segment gasket installed in tunnel segment

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