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This shows a 7.5m deep thin wall construction joint using Hy-rib ref 2811 with the ribs running vertically. The supports are U shaped reinforcement tied back into the main reinforcement. * Note the notched timber strip to the right of the Hy-rib; this is to form the reinforcement concrete cover zone. An exact same timber strip will be used on the left hand side as well.

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The same construction joint as per no 1 but with the concrete poured, compacted and hardened ready to accept the next pour. * Note the reinforcement supports were left in place as they do not reduce the performance of this joint in any way. It also allowed production to be further speeded up as no striking of the supports this time. The cover zone timber strips will be removed for preparation prior to the next pour.

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These two photos shows the roof slab of a top down road tunnel under construction The fixing of the reinforcement was continuous as Hy-rib as the same time as the rebar due to the fact that Hy-rib is a permanent formwork. This enabled productivity to be greatly increased.

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This is the same structure as per no 3&4 but showing Hy-rib insitu and supported by scaffold poles (soldiers) which in turn were wedged into the top mat of reinforcement by timber wedges. Note the timber rail above the top mat; this is to give the specified concrete cover zone. Same method underside of bottom mat however short strips are recommended as they are easier to remove.

The bottom photo shows concrete poured behind the Hy-rib and compacted, NOTE the Hy-rib /concrete surface, this is ideal. Compaction of the concrete at the Hy-rib face is only needed until the paste starts to come through, bearing in mind that as the concrete is being placed air is being expelled through the mesh thus reducing the risk of voids and honeycombing.

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These are showing Tsing Ma Suspension Bridge in Hong Kong where Hy-rib was used in construction joints. The depth of this particular stop end was approximately 30metres and was simply supported by scaffold poles tied into the reinforcement. The structure shown is one of the cable anchor blocks.

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This is showing one of the main caissons for the Second Severn Crossing Bridge in South Wales UK.

The hollow caissons were filled with concrete and as a result required stop ends within the structures. Hy-rib was used extensively throughout supported by reinforcement. In a lot of cases concrete was placed underwater as the tide rose by 18metres.

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This situation made the use of Hy-rib invaluable. It also shows Hy-rib insitu underside of the structure, this was to help prevent scour /wash out of the concrete by the incoming tide.

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This photograph shows the supporting columns in place prior to commencement of actual runway extension construction at Madeira Island Airport (Portugal).

Madeira airport but, this time it show Hy-rib in place for a construction joint prior to the concrete pour. On this occasion Hy-rib was placed and fixed into position with the ribs running vertically (note Hy-rib can be fixed with either ribs running vertically or horizontally).

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Madeira airport – shows Hy-rib used for major construction joints and running the full length of one of the many cross beams that ultimately support the runway and load for landing aircraft.

Similar view and situation as per previous page

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This shows Hy-rib being used as a baffle in a sloping pile capping beam. The purpose of this was to stop the concrete slumping down the incline of the capping beam. The length of this capping beam was over 50 metres.

Hy-rib being used in between major piles in order to form a key for sprayed concrete that was to be applied later in the contract.

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This shows 2.2metre x .6m x .6m box out in a heavy machine base slab. The reason for the box outs was that the machine being positioned had long location legs that hooked onto the rebar at the bottom of the box out (as shown). Once the machine was in position the void around the locating legs was grouted. Hy-rib was the ideal material for this application.

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Typical use of Hy-rib underwater. In this case it was positioned and used at the base of a harbour jetty in order to place concrete at the base so as to stabilise the structure (as it is metal in sinks easily and therefore needs no ballast to keep it submerged). Small piles were driven into sea bed thus allowing Hy-rib to be simply fixed by wire tying to the driven uprights. Once this was completed the concrete was poured. In addition to containing the poured concrete, Hy-rib also gave protection against scour and abrasion caused by the tide movements and the abrasion caused by the sand etc.

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This photograph shows Hy-rib in place between curved steel girders in order to contain the concrete that was due to be poured above and behind it. The reason for this construction method was it was in an old Victorian tunnel some 4 kilometres long that was built out of stone which after 150 years was beginning to deteriorate thus causing a major safety hazard to trains and personnel working below.

This shows same tunnel as no 22 but with the completed concrete pour insitu, note the depth of concrete above the steel structure.

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24- Top view of Hy-rib being used for a simple construction joint and with the concrete having been placed and compacted. The supports to the Hy-rib were rebar.

25- Another use for Hy-rib is for permanent formwork for concrete floors in apartments. This one shows Hy-rib in situ with the ribs pointing upwards thus giving a flat surface underside for the temporary supports to be placed into position.

26- This shows the underside of Hy-rib as per no 25 but this time with the concrete poured and compacted. On this occasion the developer was putting in suspended ceiling so as to enable the contractor to easily and quickly install all domestic services at a time to suit the contract.

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27- This shows 1st floor apartment floor concrete pour completed and awaiting final surface screeding.

28- Hy-rib is equally at home when used for small construction joints such as this one shown. This is a foot bridge which is heavily reinforced leading to an enormous amount of work if traditional methods of forming construction joints were used. As with all Hy-rib joint minimal preparation is needed prior to the 2nd pour along with no need to remove which in turn leads to improved productivity.

29- The photograph shown here depicts a 21º incline water spill way which used Hy-rib in order to give a construction joint surface underside of the top mat of reinforcement. The reason the contractor used this method was that the + - tolerance was 1mm and that could not be achieved by using a top shutter. Therefore Hy-rib was used as described and once the concrete had hardened they fixed (red & white) screed rail level poles into position and hand screed the finish to the specified tolerances.

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30- Hy-rib fixed into position on a pre- fabricated reinforcement unit prior to being lifted into position for concreting. The project was an 800metre rail tunnel under central London

31- Same detail as per no 30 but this time showing material and method of achieving the required concrete cover zone to the reinforcement – simply a notched timber rail wire tied and supported in position.

32- Typical view of Hy-rib with freshly poured and compacted concrete behind it. The finish is ideal.

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33- A construction joint in a base slab using Hy-rib. This one shows the finish prior to the 2nd pour, again an ideal surface achieved by using Hy-rib.

34- A core of concrete / Hy-rib taken from a test structure in order to show that no honeycombing / voids occurred during the pour. This has been confirmed by British cement Association some years back that Hy-rib help reduce voids and honeycombing. The core (one of a number taken) was also tested for flexure and compared against traditionally formed joints using timber (lumber). The results confirmed that joints using Hy-rib were 18% stronger.

35&36- This shows a trial of Hy-rib and self compacting concrete. The reason for this trial was to ascertain how Hy-rib performed when being used with a highly workable material.

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37&38- The photograph here confirms that Hy-rib works extremely well with self compacting concrete. Please note that the paste / grout shown on the support side of the Hy-rib was that maximum loss that occurred.