Finger Expansion Joint

Modular Expansion Joints
2019年3月27日
Elastomeric Expansion Joint
2019年3月27日

Finger Expansion Joint

Finger Expansion Joint

Finger Expansion Joint, also known as comb expansion joint, consists of symmetrical or non-symmetrical elements(such as comb or saw-tooth or sinusoidal plates) which are anchored on one side of the deck joint gap and interpenetrate to bridge deck joint gap. Commonly, finger expansion joint with symmetrical elements is called cantilever expansion joint suitable for small expansion amount, while finger expansion joint with non-symmetrical elements is called supported finger expansion joint more suitable for larger expansion amount.

Finger expansion joint – tooth shape

Finger Expansion Joint Types

Cantilever expansion joint with symmetrical elements

Cantilever expansion joint with steel profiles and anchor bars

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Supported finger expansion joint with anchor bar

Supported finger expansion joint with rubber sealing strip

Finger Expansion Joint Specification

Expansion Amount

mm

A

mm

H

mm

E1

mm

A

mm

B

mm

F

mm

E2

mm

L

mm

40 300 200 160 20 60 400 120 140
80 300 200 200 20 100 500 150 150
160 300 200 200 20 180 600 200 200
200 300 200 200 20 220 700 250 250
240 300 200 200 20 260 800 300 300
300 300 240 200 20 320 900 350 350
1600 400 360 280 20 1620 3400 1600 1600
1680 400 360 280 20 1700 3600 1700 1700
1760 400 360 280 20 1780 3800 1800 1800
1840 400 360 260 20 1860 4000 1900 1900
Please contact BAOLI for more specifications

Finger Expansion Joint Components

surface element(finger plate), supporting substructure, anchorage devices, connecting devices, kerb elements, drainage devices, connectors to the watertight membrane, transition strip(not included in the supporting structure, covers.

Finger Expansion Joint Advantages

  • Comfortable driving for fast or heavy traffic,
  • Low levels of noise emission,
  • Reliable anchorage system,
  • Easy installation and maintenance.

Finger Expansion Joint Making Process

Steel parts cutting by cutting machine→drill holes by laser machine→ welding anchor plate and anchor bar shot blasting by abrasion blasting equipment→prepare bolts with screw

use polisher to grind and repair steel plate until the surface is plane products painting →vulcanizing of drainage channel and drill holes

For more details, please click here: Finger Expansion Joint Making Process PDF DOWNLOAD

Finger Expansion Joint Application

Cantilever expansion joint with triangular tooth and +/-40mm movement Cantilever expansion joint with rectangular tooth and +/-40mm movement
Supported expansion joint with oval tooth and +/-80mm movement Cantilever expansion joint with triangular tooth and +/-80mm movement

 

 

 

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