Flat Jacking

Flat jacks ranging from 8 to 1,030 tons in capacity, the ultra low unit is capable of exerting extremely high trust forces. They are normally used within the civil and construction industry for a multitude of jacking applications, such as, lifting heavy structures, stressing operations, transferring existing loads / pre-loading steelwork to temporary or permanent supports and permanently pre-loading bearings, bridge jacking and structures.

Hydra-Capsule low height flat jacks range from 8 to 1,0 50 tons capacity, the low height jack is capable of exerting extremely high trust forces. They are normally used within the civil and construction industry for a multitude of applications, such as, lifting heavy structures, stressing operations, transferring existing loads to temporary or permanent supports and permanently pre-loading buildings, structures, and bridge bearings to seismic isolators.

Due to their design, they are not only light in weight but require a minimal installation gap or just a few centimetres, when selecting a flat jack, the ideal working range should be about 75% of the jacks capacity

Where a permanent force/load is require to a structure, flat jacks are installed in-situ and inflated using a high pressure injection system, epoxy resin or cementitious grout can be injected, but grout filled units are normally recommended in order to meet the current day environmental and fire regulations.

This application is primarily implemented whilst carry out works for pre-loading of structural steelwork or part of structural alterations, pre-stressing, underpinning and structural and bridge bearing pre-loading.

It’s essential that the mixing and grouting operation is carried out quickly and efficiently and we would therefore strongly recommend that our experienced Engineers carry out such operations as mistakes can prove to be expensive.

Hydra Capsule provide a full design, in-house manufacturing and flat jacking installation service offered throughout the UK and Internationally. Bespoke flat jacks can be manufactured for special applications.

Advantage of Flat Jacks

  • Forces from 8 tonnes upto over 1,000 tonnes
  • Measuring and control of induced thrust forces and loads
  • Load transfer
  • Balance force loading on double-stack flat jack arrangement
  • Access restraints for wedging and grouting of gap
  • Low height jack as small as 35mm gap
  • Idea for underpinning and pre-stressing
  • Can be use for temporary (hydraulic oil / water) and permanent (grout and resin) applications

Preloading of Steelwork and Load transfer

Settlement and Structural Jacking



From 8 to 345 Tons Capacity

JACK
CODE
CAPACITY
(tons)
CLOSED HEIGHT OUTSIDE
DIAMETER
THRUST
DIAMETER
MAXIMUM
STROKE
MAXIMUM
PRESSURE
FLUID
LITRES
WEIGHT
(KGS)
Data
Sheet
FJ 12 8 28 120 75 25 150 bar 0.3 4
FJ 15 15 29 150 105 25 150 bar 0.5 8
FJ 17 20 29 170 125 25 150 bar 0.8 9
FJ 19 25 30 190 145 25 150 bar 1.1 10
FJ 22 40 30 220 175 25 150 bar 1.2 16
FJ 25 50 30 250 205 25 150 bar 1.3 19
FJ 27 60 31 270 225 25 150 bar 1.6 20
FJ 30 80 32 300 254 25 150 bar 1.9 23
FJ 35 100 34 350 304 25 150 bar 2.6 26
FJ 42 160 35 420 373 25 150 bar 3.6 29
FJ 45 180 36 450 403 25 150 bar 4.1 30
FJ 48 210 36 480 433 25 150 bar 4.7 32
FJ 52 265 36 520 473 25 150 bar 5.7 36
FJ 56 300 37 560 512 25 150 bar 6.2 38
FJ 60 345 38 600 553 25 150 bar 7.4 43
 FJ 75 600 36 750 705 35 150 bar 12.4 89.5
FJ 87 764 40 870 825 35 150 bar 16.8 110.8
FJ 92 868 40 920 875 35 150 bar 18.7 126.4
FJ 102 1030 55 1020 940 40 150 bar 24.4 175.2

Each individual jack is fully proof load tested and certified as in accordance with UK legislation.

Temporary Flat Jacks

When Flat jacks are required for a temporary duration and then subsequently removed, this operation is usually carried out with water or hydraulic oil fluid.

The benefits of temporary flat jacks:

  • Use as a load cell (pre-inflates), connected with a pressure gauge or digital transducer read-out
  • Continuous load monitoring and adjustment
  • Multiple flat jacks circuit
  • Ability to transfuse from temporary to permanent application (epoxy resin or cementitious grout

Transfusion Flat Jacks

Single Flat Jack

Transfusion flat jacks are specially designed in-house, and manufactured by Hydra Capsule. These flat jacks have the ability to transfuse grout whilst under load, from a temporary to a permanent load. The design of the flat jacks allows for a balanced load and movement displacement throughout the grout transfusion operation.

Double-stack Flat Jacks

The same can be achieved as the double-stack flat jack arrangement. However, the transfusion method is inflating one flat jack, whilst the other flat jack is deflated and maintaining a constant balance load between both flat jacks.


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Hydra House - Bishops Frome
Worcestershire
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