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Flat Jacks, Hydraulic Jacking Systems,
Monitoring Equipment, Temporary Propping,
Jack Hire and Sales

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)
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.