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Pot Bearing Allows Rotations by Shear Deformation


Pot bearing, also known as pot rubber bearing, with elastomeric bearing embedded inside of the steel plate, can be divided into fixed pot bearing, guided pot bearing and free sliding pot bearing. Pot bearings are special types of bridge bearings for taking large loads, large horizontal displacements and large rotation requirements in confined areas. The loading capacity of elastomeric bearings is limited, while pot bearings solved this problem, thus pot bearings are often regarded as suitable for use when bridges need large bearing reactions.

A picture is showing the structure of the pot bearing.
PB-01: Pot bearing structure.
An orange color pot bearing with thick top steel plate and bottom steel plate.
PB-02: Pot bearing is made of high quality steel.
Pot bearing types

Fixed pot bearing

A picture is showing the structure of the fixed pot bearing.

Fixed pot bearing is unmoved in all directions. Under loads, the elastomeric bearing pad behaves likes an incompressible confined fluid which enables the rotations on any axis.

A picture is showing the cross section of the fixed pot bearing.
Fixed pot bearing - some specifications
Bearing capacity (MN) Main sizes (mm) Weight (kg) Embedded column bottom
d × L
A/B/C/D A'/B'/C'/D' H
FX0.8 250 210 75 25 Φ40 × 250
FX1.0 280 235 80 34 Φ40 × 250
FX1.25 310 260 85 45 Φ40 × 250
FX1.5 340 290 90 57 Φ40 × 250
FX2.0 390 330 95 79 Φ40 × 250
FX2.5 435 370 100 104 Φ40 × 250
FX3.0 545 460 115 187 Φ40 × 250
FX3.5 510 430 110 158 Φ40 × 250
FX4.0 545 460 115 187 Φ40 × 250
FX5.0 610 520 130 265 Φ50 × 300

Guided pot bearing

A picture is showing the structure of the guided pot bearing.

Guided pot bearing with steel guide edge can be only moved in one direction. The stainless steel slide and PTFE slide further reduce the friction coefficient and guided pot bearing is used best when horizontal loads are relatively small (less than 20% of vertical Load).

A picture is showing the cross section of the guided pot bearing.
Guided pot bearing - some specifications
Bearing capacity (MN) Longitudinal displacement (mm) Main sizes (mm) Weight (kg) Embedded column bottom
d× L
A A' B C/D C' H
GU6 ± 100 ± 150 ± 200 740, 840, 940 680, 780, 880 770 680 620 150 423.7 446.2 468.7 Φ50 × 300
GU7 ± 100 ± 150 ± 200 780, 880, 980 720, 820, 920 820 730 670 160 516.7 542.5 568.4 Φ50 × 300
GU8 ± 100 ± 150 ± 200 810, 910, 1010 740, 840, 940 890 780 710 170 634 664.7 695.5 Φ60 × 300
GU9 ± 100 ± 150 ± 200 850, 950, 1050 780, 880, 980 935 825 755 180 744.9 778.9 813.0 Φ60 × 300
GU10 ± 150 ± 200 ± 250 980, 1080, 1180 910, 1010, 1110 985 875 800 190 907.9 944.9 982.3 Φ60 × 300
GU12.5 ± 150 ± 200 ± 250 1060, 1160, 1260 980, 1080, 1180 1100 970 890 205 1205.7 2151.4 1297.1 Φ70 × 350
GU15 ± 150 ± 200 ± 250 1130, 1230, 1330 1050, 1150, 1250 1190 1060 980 220 1513.7 1565.9 1618.2 Φ70 × 350
GU17.5 ± 150 ± 200 ± 250 1190, 1290, 1390 1105, 1205, 1305 1295 1145 1060 235 1887.6 1949.1 2010.6 Φ70 × 350
GU20 ± 150 ± 200 ± 250 1250, 1350, 1450 1155, 1255, 1355 1375 1225 1130 250 2263.9 2332.1 2400.2 Φ80 × 350
GU22.5 ± 150 ± 200 ± 250 1310, 1410, 1510 1220, 1320, 1420 1450 1300 1210 260 2620.3 2694.2 2768.1 Φ80 × 350
Transverse displacement: ±3 mm.

Free sliding pot bearing

A picture is showing the structure of the free sliding pot bearing.

Free sliding pot bearing can be movable in all directions. The added PTFE and stainless steel sliding surface between the piston and the sole plate creates a bearing assembly that allows horizontal movement in any direction.

A picture is showing the cross section of the free sliding pot bearing.
Free sliding pot bearing - some specifications
Bearing capacity (MN) Longitudinal displacement
(mm)
Main sizes (mm) Weight (kg) Embedded column bottom
d × L
A A' B C/D C'/D' H
FS25 ±150 ±200 ±250 1360, 1460, 1560 1250, 1350, 1450 1340 1340 1110 270 2540.4 2597.9 2651.2 Φ90 × 400
FS27.5 ±150 ±200 ±250 1410, 1510, 1610 1300, 1400, 1500 1410 1410 1170 280 2898.8 2961.5 3019.5 Φ90 × 400
FS30 ±150 ±200 ±250 1470, 1560, 1660 1360, 1450, 1550 1470 1470 1220 290 3277.3 3334.5 3403.2 Φ90 × 400
FS32.5 ±200 ± 250 ±300 1610, 1710, 1810 1490, 1590, 1690 1525 1525 1270 300 3714.1 3788.9 3863.8 Φ100 × 400
FS35 ±200 ± 250 ±300 1650, 1750, 1850 1530, 1630, 1730 1585 1585 1320 310 4143.9 4225.5 4307.0 Φ100 × 400
FS37.5 ±200 ± 250 ±300 1690, 1790, 1890 1570, 1670, 1770 1645 1645 1370 320 4581.9 4669.0 4756.2 Φ100 × 400
FS40 ±200 ± 250 ±300 1730, 1830, 1930 1610, 1710, 1810 1690 1690 1410 330 4993.3 5085.5 5177.7 Φ100 × 400
FS45 ± 200 ±250 ±300 1810, 1910, 2010 1680, 1780, 1880 1800 1800 1500 345 5870.9 5973.3 6075.8 Φ110 × 400
FS50 ±200 ±250 ±300 1890, 1990, 2090 1760, 1860, 1960 1890 1890 1570 360 6751.0 6864.5 6977.9 Φ110 × 400
FS55 ± 200 ±250 ±300 1990, 2060, 2160 1850, 1920, 2020 1990 1990 1660 37 7832.4 7921.5 8047.2 Φ120 × 400
FS60 ±200 ±250 ± 300 2070, 2130, 2230 1930, 1990, 2090 2070 2070 1720 390 8823.7 8907.7 9044.9 Φ120 × 400

Technical performance

  • Bearing capacity of the pot bearing is 100% of the design capacity and allow overloading 10%.
  • When working temperature changes from -25 °C to + 60 °C, the minimum design friction coefficient of pot bearing is 0.03. When working temperature changes from -40 °C to + 60 °C, the minimum design friction coefficient of pot bearing is 0.06.
  • The maximum rotation of pot bearing is 0.03 rad.

Working temperature

  • Normal temperature type: -25 °C to + 60 °C.
  • Cold resistance type: -40 °C to + 60 °C.

Feature

  • With low-profile but high loading capability over 50,000 kN than elastomeric bearing.
  • Shearing strength of elastomeric pad is increased through the method of encasing it in the steel pot.
  • Allow for large rotations ranging from 0 to 0.03 rad.
  • Low friction coefficient between 1% and 3%.
  • All the metallic parts are protected against corrosion by galvanization and epoxy painting according to EN 1337-9 (also can be customized).
  • Complying with EN 1337, DIN 4141, BS5400, AASHTO, SETRA, etc.
Several different sizes pot bearings are placed in the workshop.
PB-03: Top and bottom steel plate for making the pot bearings.
A pot bearing is packed in plastic film and then reinforced with wood.
PB-04: Package: pot bearing is packed with plastic film and wood.

Application
Pot bearings are suitable for locations where low-profile, high-load bearing devices are required. And they are especially suited for curved or skewed bridges and other complex structures where the direction of rotation varies or cannot be precisely determined.

An orange color guided pot bearing is connected the bridge deck and the bridge pier.
PB-05: Guided pot bearings are used for bridges.
A high speed railway is supported by pot bearings.
PB-06: Pot bearings are used for high speed railway.

Pot bearing installation notice

  • When pot bearing is transported to the construction site, the components and packing list in the box should be checked. After passing the checkout, the pot bearing should be placed into the box again. When the pot bearing needs to be installed, then you can take it out.
  • When unpacking the case, the PTFE plate and stainless steel plate should be well protected to avoid scratching and booty attaching. At the same time, 5201-2 silicone grease should be fully filled.
  • The supporting padding stone should be set under the pot bearing and the strength grade of concrete should not less than C40. The height of supporting padding stone should consider the installation, maintenance and replacement of the pot bearing.
  • Supporting padding stone and concrete on pier top should be equipped with corresponding reinforced mesh in according to the JTG D62-2004. The anchor holes should be preserved according to the anchoring sleeve's specifications and quantity.
  • When installing the guided spherical bearing or free sliding spherical bearing, we should pay attention to check the PTFE sliding, and the main sliding direction of the PTFE sliding should be consistent with the bridge direction.
  • The central line of the pot bearing and the main beam should be paralleled or coincided.

Inquiry for Our Product

Zaoqiang Dacheng Rubber Co., Ltd.
E-mail: sales@bridgebearing.org

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