Hiscs - LMK PT System

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Hiscs - LMK PT System

LMK PT system manufacturer & supplier. Specialized Engineeting Services for Infrastructures

Having experience of more than 30 years in the field of specialized Engineering services, HiSCS can provide services in design, inspection, supervision, maintenance & retrofitting of structural elements requiring sophisticated know‐how such as Bridge Bearings, Expansion Joints, Road Traffic & Highway Safety Systems. Offering a broad range of professional services HiSCS can successfully accomplish

demanding projects meeting all requirements of the modern construction industry and Standards. HiSCS is a supplier of a full range of specialized equipments and machinery such us inspection tools, lifting & stressing jacks, pumps, threading and grouting machines, de-coilers, grout test and hydraulic pressure apparatus, presetting and deforming devices, mixers & tanks, lifting & hoisting devices.

26/06/2025

Shipyard Jetty PT Works

HiSCS has been awarded the installation, stressing and grouting works of PT beams of a shipyard’s jetty.
The project deals with the upgrading of a shipyard’s jetty formed by precasted beams, which were found with significant damages over the years. The upgrading design calls for the demolition of the existing beams and the er****on of new post-tensioned beams able to meet the requirements of ships docking and pipe rack systems.
The new beams having a length of 36.5m and 1.15m height, will be erected in a neighbouring area inside the shipyard and will be transferred at the jetty using a heavy barge crane.

Each beam consists of 3 tendons with 17-19, seven-wire strands with nominal diameter 15,7mm, in total 8 PT beams, forming a 4-span jetty.

The working sequence starts with the installation of rebar cage/partial shuttering, followed by the PT ducts, bearing plates, grouting accessories, and strands threading. After the placement of complete shuttering, concrete casting is taking place. Upon gain the required by the design strength, stressing follows to implement the stressing forces in the beams. A force of about 75-80% of strands breaking load is usually applied, verified by the elongation of the strands.

The PT work is accomplished with grouting to achieve the bonding of strands. Threading, stressing, and grouting protocols are issued and delivered to the client by HiSCS Technicians and Engineers.

20/05/2025

Maintenance and Inspection of Bearings

HiSCS implemented the maintenance works of spherical bearings supporting the steel shelter covering the famous archeological site in Akrotiri village of Santorini Island in Greece.
Based on the results of the inspection that took place in Dec 2024, all 94 spherical bearings installed at the footings of the shelter’s steel columns, were maintained for the upkeep of their functionality.
The task was intense considering working inside wells/confined spaces up to 7m deep, with volcanic ashes covering most of the areas and having the archeological site open to the public.
Dry cleaning of bearings, touch-up paintings to keep effective their anticorrosion protection, protective membranes patches, installation of crack-meters to monitor the propagation of cracks and other maintenance works took place.
In addition, after the accomplishment of the maintenance work, a routine inspection was performed by HiSCS Inspectors to evaluate the overall condition of bearings and assure their proper function.

05/05/2025

Grouting of Post-Tensioning Tendons in Slabs

HiSCS site team has concluded the grouting works of PT tendons in the slabs-bridges of the new office complex in Maroussi area, Athens-Greece, named “THE GRID”. In total 550 flat tendons of 4 & 5 strands filled with grout following the harmonized standards EN-445-446-447.

The grouting has been performed from ground elevation up to +19.25m using a grouting pump machine with an agitator and a high-speed mixing tank capable of continuous mechanical mixing to achieve a homogeneous grout free of lumps and undispersed cement.

The grouting works commenced by blowing air inside the tendons to check the grouting pe*******on capability. Prior to each grout, a daily test using a cone testing apparatus was performed so as to verify the fluidity of the grout as per EN447 (Grout for prestressing tendons-basic requirements) by measuring the fluid time and temperature. Additional tests such as bleeding, volume change and grout strength were also performed.

The grout batch consisted of cement type CEM I52,5N/CEM I42,5N, expander and plasticizer admixtures and potable water not exceeding 40 lit/100Kg cement. The mixing sequence followed first water, then additives and last the cement, added gradually with precaution to be homogenized without aggregations. Mixing was of such duration, with a minimum of 2 min, to attain a uniform thoroughly blended grout without excessive temperature increase or loss of expansive properties of the admixture.

More than 7250 lit of grout were produced using +10 tons of cement and +200Kg of admixtures. Each tendon was under at min 5 bar pressure for a period of 1 min, having all its venting/grouting ports closed/sealed, was checked to assure the tightness of the tendon (no leakage).

Grouting is the last in sequence of PT works and is performed as soon as possible after 24h from stressing. The process of introducing grout into the tendon is a simple and effective way to improve its overall durability by encasing the strands with a protective layer to prevent corrosion, to achieve bonding with the strand, and continuation of the structure’s section (no voids).

14/04/2025

Revolutionizing Bridge Management through Photogrammetry Modeling

The combination of photogrammetry, bridge inspection, and structural health monitoring is transforming the way we manage and safeguard our bridges. By utilizing advanced technologies, these systems not only enhance the safety and efficiency of bridge inspections but also help prolong the lifespan of these critical infrastructures. As these technologies continue to evolve, they will play an increasingly important role in developing smarter, safer, and more sustainable transportation networks globally.

HiSCS is actively involved in the prestigious “SMART BRIDGES” initiative, which involves assessing 150 road and 100 railway bridges across Greece. This project will employ state-of-the-art systems to monitor the behavior of these bridges in real-time using Structural Health Monitoring (RTSHM) methods. HiSCS is responsible for conducting all survey activities using laser scanners, high-resolution cameras, and drones to create cloud models of each bridge and produce as-built drawings. It is anticipated that over 2TB of data will be collected for analysis and evaluation.

In addition, HiSCS inspectors will assess the current condition of the bridges, documenting any deficiencies to determine the overall condition of each structure. This data will be crucial for structural analysis and classification. During the inspection phase, a National Bridge Registry will be established and delivered to the National Bridge Authority. This platform will allow all bridge operators in Greece to access a Bridge Management System designed to support maintenance and repair needs.

The project requires HiSCS to engage 4 on-site survey teams, 6 off-site draftsmen teams, 3 inspection engineering teams, and 2 installation teams, including traffic coordinators, special vehicle operators, electricians, and technicians, all working together to manage the survey, inspection, and installation processes. Supported by the Greek Ministry of Public Works and the Technical Chamber of Greece, the project aims to predict structural failures early, enabling authorities to take swift action and prioritize repairs. This approach will optimize resource allocation, especially in light of climate-related risks.

HiSCS is proud to contribute to this project, which will help transform Greece’s aging bridge infrastructure—many built between the 1950s and 1980s—into “smart” bridges capable of real-time structural and functional assessments.

01/04/2025

Stressing of Tendons in Post-Tensioned Concrete Slabs

HiSCS site team has initiated the stressing works of PT tendons in the slabs-bridges of the new office complex in Maroussi area, Athens-Greece, named “THE GRID”.

The stressing procedure of tendons is a critical step in post-tensioning, as it determines the final level of compression that is applied to the slab, creating internal forces that counteract tensile stresses, which helps to reduce cracking and control deformation. It is a critical action that directly impacts the performance, safety, and durability of the structure. Properly stressed tendons ensure that the slab can handle the loads it will encounter throughout its lifespan, maintain its shape under stress, and resist cracking—all factors that lead to a longer-lasting and more efficient structure.

In this project, stressing is implemented gradually in all 20 slab-bridges, consisting of 7 up to 40 nos. of PT tendons. Each tendon consists of a stressing (live) end and dead end (onion type embedded in the concrete), having 4 or 5 wire strands of 15.7mm nominal diameter.

As per the design, a stressing force of about 193KN/strand up to 221KN/strand will be applied. In total, more than 2680 stressing operations will take place, using a mono-strand jack.

The stressing process follows the below basic steps:
• Study of PT design data, pressure-force calculation based on jack calibration report.
• Check-availability of equipment (jack, pump and calibrated gauge).
• Visual inspection of stressing anchorage, strands overlength and cleaning if necessary.
• Installation of anchor heads and wedges (has preceded).
• Safety measures and notification of works (warning signs and no-go area marking off).
• Initial stressing to eliminate slack, marking on the strands.
• Stressing in phases (50-100bars) up to the final stressing force. In each phase the apparent elongation of jack piston is recorded.
• Recording of the actual elongation on the strand.
• Calculation of the total elongation, excluding losses (i.e., wedges drawn-in etc.) and issuance of stressing protocols.

18/03/2025

Enhancing Bridge Safety: Inspection, Maintenance, and Real-Time Monitoring

Bridge inspection and maintenance are essential for ensuring the safety, longevity, and performance of transportation infrastructure. Regular inspections help identify signs of wear, damage, or structural issues that could compromise safety.

The use of specialized bridge inspection vehicles allows inspectors to access hard-to-reach areas and gather detailed data for accurate assessments.

In addition, the installation of Real-Time Structural Health Monitoring (RTSHM) equipment provides continuous, real-time data on a bridge's condition, enabling proactive maintenance and early detection of potential problems. This technology enhances the efficiency of inspections and maintenance, helping to prevent costly failures and extend the lifespan of bridges.

Together, these advanced methods ensure the continued safety of travellers and minimize disruptions to transportation networks.

HiSCS has undertaken the coordination of onsite installation of RTSHM equipment for several road and railway bridges, spread all over Greece.

The project involves the installation of optical fiber sensors, accelerometers, thermometers, rain & water level sensors, cabling, and 5G cellular equipment, at 150 road and 100 railway bridges. The whole setup is powered through a system consisted of solar panels, batteries and charging controllers, leading to a fully autonomous configuration. The acquired data are transferred, in real time, to a platform through which they are introduced in state-of-the-art software to model, analyse and monitor each bridge’s behaviour under structural loads.

25/02/2025

Supply of Overhead Movable Scaffolding System (MSS)

The new Eastern ring road of Thessaloniki (located in the city of Thessaloniki in Northern Greece), known as Thessaloniki flyover, will be one of the most emblematic road axes in Greece. It is a 13 km long motorway, including 9 interchanges, 10 new bridges and 3 new tunnels as well as the longest (4 km) elevated expressway bridge in the country.

The construction of this elevated bridge follows a span-to-span er****on using the concept of OverHead Movable Scaffolding System (OH-MSS).

HiSCS representing NRS, a worldwide leading expertise in the design and supply of specialized bridge er****on equipment, has been involved in the supply of two OH-MSS systems for this project.

OH-MSS is a special-purpose, self-launching system, used in bridge construction, specifically for cast-in-situ prestressed multi span/segment concrete bridges.
The system consists of a steel structure (main girders) spanning between two piers from which formwork is supported. The inner formworks (core form) are collapsible and can run on a rail system to allow easy relocation to the next span. The system is designed so that the outer formwork can be opened sufficiently and adequately allowing to move along the bridge piers during the launching operation. After launching, the formwork is closed again and after setting to the designed alignment and level, placing of reinforcement and casting can commence.
There are ancillary components such as plywood sheeting, threaded bars, and hydraulic systems required for safe and efficient operation.

The design of this specific OH-MSS is based on the following assumptions:

- Max. span: 50m
- Max. concreting length: 45m
- Weight of superstructure: 42t /m
- Max. span weight: 1966 tons
- Min. horizontal radius: 1100 m
- Max. longitudinal slope: 6%
- Max. super elevation / cross fall: 2,5%
- Typical width of span: 22,20m

Stay tuned for more updates.

07/02/2025

"THE GRID" - Post Tensioning works

HiSCS is participating in the implementation of Post Tensioning (PT) works, which is part of the project regarding the construction of the new office complex in Maroussi area, Athens-Greece, named “THE GRID”.
THE GRID complex is to be constructed on a plot of land measuring 16,100 m2 having a total area of 61.500 m2, of which 26.400 m2 correspond to superstructure and 35.100 m2 to underground areas.
The office complex consists of 2 L-shaped buildings which are arranged opposite each other forming a central garden with extensive vegetation. Each building consists of three distinct volumes, which are connected by PT slab-bridges supported on elastomeric bearings.

In total 20 nos. of slab-bridges will be erected having length to the order of 15,18 m, thickness 0.47m and a width varies from 2.68 m to 8.34 m.
HiSCS has undertaken the installation-stressing and grouting works, of 550 nos. of flat PT bonded tendons, with live-dead configuration, consist of 4 to 5 strands each.
In total 41 tons PC strand of nominal diameter 15.7mm will be threaded in about 6.800 m of total accumulative length of PT tendons.

We are thrilled to participate in such prestigious project meeting the needs of the PT design and the demanding job-site requirements in work-safety and time scheduling.

22/01/2025

Inspection & Evaluation of Villas at KFUPM-KSA

HiSCS is involved in the evaluation and reporting regarding the structural assessment of 90 villas combos located in King Fahad University of Petroleum & Minerals (KFUPM) in the city of Dammam, Kingdom of Saudi Arabia.
KFUPM is a research University ranked among the most prestigious academic institutions in the Kingdom of Saudi Arabia.
HiSCS will provide inspection software to the local inspectors gathering all data required for the evaluation of the actual condition of the structural elements of the villas, such as foundations, columns, walls, ceiling etc.
The inspection will be flourished with Non-Destructive Testing (NDT) such as Schmidt hammer testing, ultrasonic surveys, half-cell potential tests, chemical analysis on concrete, carbonation, and concrete cores to record the compressive strength.
The evaluation will depict the structural health of the villas and define the condition rating from good to fail as well as the repair and maintenance work and priorities needed.

16/01/2025

HiSCS celebrated New Year 2025 by cutting the Vasilopita. Vasilopita is a sweet cake, symbol of the New Year associated with the feast of Saint Basil, from whom it takes its name.
Following the tradition, a coin was placed inside the cake, which whoever finds when sharing Vasilopita will be the lucky and favored one of the New Year.
Congratulations to Nefeli who found the coin. Warm wishes for a prosperous and peaceful 2025.

19/12/2024

Inspection of Bearings - Akrotiri archaeological shelter - Santorini island - Greece

Our inspectors performed the routine inspection of the spherical bearings, which support the steel shelter, of the Akrotiri Archaeological site, in Santorini Island, in Greece. The site comprises an entire coastal city, of the Minoan civilization, with streets, squares, multistory buildings, workshops, etc. preserved by the volcanic ash of the Theran eruption, which occurred in the 16th century BC.

The ninety-four (94) fixed type spherical steel bearings, located at the footings of the steel columns, have a convex curved element, which slide on a matching concave surface, transferring vertical and horizontal forces while, at the same time, allowing significant rotations in all axes. They have vertical capacity of 1500KN, horizontal capacity of 800KN and rotational capacity of ±2.5˚. Also, twenty-eight (28) of them are designed to bear up-lift loads to the order of 1100KN.

The Inspectors of HiSCS gathered all necessary data to observe the bearing’s functionality and evaluate their condition, aiming to reveal needed actions for maintenance and repair. Our special inspection software was utilized and hence all site data were uploaded, in real time, for back-office analysis and conclusions.

We welcome the initiative of the Owner, the Archeological Society of Athens, to proceed with the inspection of the bearings, thus, protecting the public investment by the timely identification of potential future issues.

04/12/2024

Installation of Seismic Isolation Bearings in Building

HiSCS’s Engineers & Technicians executed the installation of anti-seismic High Damping Rubber Bearings (HDRB), at a private residential building construction site, located in Athens, Greece. In total ten (10) HDRB bearings and one Free Sliding Pot Bearing were installed, following a methodology designed by HiSCS, to assure the prompt installation of these devices, in line with the construction requirements and the building design codes.
The seismic isolation bearings, installed on the top of the basement columns, are capable to bear a maximum vertical seismic load of 3180KN each, with horizontal movement capacity of ±250mm. The pot bearing, installed in the elevator’s shaft, is capable to bear a maximum vertical load of 2320KN, with horizontal sliding capacity in all directions of ±250mm.
Seismic base isolation is one of the most popular means of protecting a structure against earthquake forces. The fundamental principle of a base isolation system is to alter the response of the building structure so that the ground below can move “independently” without transmitting these motion forces to the building above. This is achieved by the deformation of the bearing’s rubber, which, in the case of using HDRB bearings, has a considerable damping capacity (about 15% equivalent viscous damping at 100% shear strain). During an earthquake event, the superstructure (floors), is isolated from the substructure (basement columns) that is resting on.

Address

16, Kifissias Avenue
Athens
11526

Website

http://www.hiscs.gr/, https://www.instagram.com/hiscslmk/

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