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

Flat Jacking

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

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)
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

When 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.