Flat Jacks and Flat Jacking Systems


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.

Technical data sheet for flat jacking brochure applications can be loaded from download page for relative information.

Due to their design, our flat jacking equipment is 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% to 85% of the flat jacks capacity.

All our Hydra Capsule flat jacks are fully designed and manufactured within our new purpose built warehouse facility. Where we test all flat jacking equipment to the maximum specified force / load within our 1200 tonnes test press, submitted with full proof loading certification.
 

Permanent Units for Preloading New Steelworks

Flat jacks have the ability to induce a permanent force/load required for pre-loading steelwork and a structure respectively. The installation of our flat jacking equipment is carried out 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 normally implemented to new supporting steelworks during structural alterations, underpinning or bridge bearing replacement operations requiring pre-stressing to avoid excessive deflections taking place when any temporary supports are removed.

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

Hydra-Capsule provide a full design, in-house manufacturing and flat jack installation service offered throughout the UK and Internationally. Bespoke units can also be manufactured to suit customers particular requirements, please contact us for further details.

Advantages:
  • Permanently induced force.
  • Known and precise load induction.
  • Used for alternative load cells  applications
  • Balance force loading for flat jacking multiple sets.
  • Temporary to permanent using transfusion techniques.
  • Monitoring of loads during building construction.
 
grout transfusion operations synchronised preloading of steelwork






side elevation diagram






hydraulic jacking & monitoring equipment

Flat Jacks from 8 to 868 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 for Bridge Jacking

hydraulic jacking and monitoring equipment for liftingWhen flat jacks are required for a temporary duration and then subsequently removed, they are normally inflated using water or hydraulic oil.

The benefits of temporary flat jacks:
  • Used as load cells when connected to pressure gauge or transducer complete with digital read-outs.
  • Pre-loading steelwork with temporary support systems
  • Continuous load monitoring and adjustment possible.
  • Multiple flat jack circuit to enable uniform loading.
  • Ability to transfuse from temporary to permanent. 
  


Transfusion Units

Single Flat Jack

Transfusion flat jacks are specially designed in-house, and manufactured by Hydra-Capsule, they 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. Which are ideal for the use of bridge jacking projects.

Due to our purpose built manufacturing facility, we are able to offer fully modifications for vertical and horizontal transfusion jacks for all necessary requirements.

Double-Stack

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

 
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