Precast Connections You Must Know In 2020

Structural Connections For Precast Concrete Buildings

The precast joint connections on construction sites has always been a difficult challenge due to manufacturing tolerances and the need to transfer loads through the structure; even more so when you factor in a required resilience to a seismic events. Precast components are inherently stiff, so it is essential that the precast concrete connections are robust enough to allow the structure to absorb the energy of the earthquake, whilst providing enough robustness to avoid collapse.

There are a number of ways of doing this such as via:
• Grouted Coupler for precasts walls and columns to foundations connection
• Wire Loop Box for precast walls connection
• Precast Coupler for precast elements connection
• Dowel Systems for precast beam to column connection

Apply the latest technology of precast connections from Halfen Moment, available in Malaysia, Singapore, India & Philippines. Discover more now!

Moment® Grout Coupler

Grout coupler are traditionally used in the bottom of a column or wall as a means to connect on to starter bars protruding from the foundation. Although they might often be designed as a pin connection, the reality is that this will transfer moment from the foundation in to the wall or column and should therefore always be made of a ductile material that does not compromise the ductility of the steel reinforcement that it is coupling together. To that end, the coupler should always be of a “bar break” type where there is a considerable factor of safety between the bar failure and the coupler failure capacities.

Moment® Wire Loop Box

Wire loop boxes are prefabricated components with a constant rebate geometry and 1 or 2 high strength (c. 1600-1800MPa) wire loops. Loops from adjacent elements then overlap during installation of the panels and are secured using a reinforcing bar and a high early strength grout to complete the connection.

They are usually used to connect 2 adjacent precast panels together, where the interlocking rebar and wire loops provides robustness in the event of an Earthquake to ensure that grout degradation would not result in complete collapse.

Loop Box Used on Site

Moment® Connection Loop

Connection Loop is a single-wire loop used to connect 2 precast boxes for the prefabricated prefinished volumetric construction (PPVC).

In order to connect 2 precast elements, both precast elements has to be cast with the Moment® Connection Loop at the wall. A rebar will then be inserted through the intersection of 2 loops. After placing the rebar, the gap between the precast elements will need to be grouted using a 40Mpa or 70MPa non shrink grout depending on the application. Material strength of the Moment® Connection Loop is 1770N/mm  and complies to EN12385-4:2002+A1.

Moment Connection Loop PPVC

HEK Precast Coupler

The HEK Precast coupler is an innovative and versatile solution for fast and easy connection of precast concrete elements.

Cast-in DEMU Fixing anchors i.e. T-FIXX®, bolt or bar anchors transfer the tension and shear force into the precast element.

The main advantage of the system is the fast and efficient positioning of precast elements. The connection can be subjected to load immediately after installation. This results in a substantial improvement in construction time.

 HALFEN HEK Precast couplerHEK Precast Coupler Application with DEMU Fixing Anchor

Invisible Connections

Shear dowel systems are always a challenge as they generally require very tight tolerances to ensure effective load transfer, so systems without grout and oversized holes are almost impossible. Traditionally, precast slabs such as stair landings used to be supported by a steel angle bolted to the wall. Installation was slow, required high degrees of accuracy, tied up the crane with costly hook- time and could only be used on straight walls.

But by keeping the grouting to a minimum, one such technology – Invisible Connections – has revolutionized the use of precast all throughout Northern Europe; it is a patented system, with its origins in Norway, to connect precast concrete without use of corbels or steel angles, and is used extensively throughout Europe due to the independently tested and certified European Technical Approval (ETA [4]) that provides engineers with peace of mind about the capacities.

The product range of Invisible Connections consists mainly of TSS Telescopic Stair Connectors & BSF Telescopic Beam Connectors.

85  BSF Telescopic Beam Connectors

Another topic relating to Invisible Connections will be covered as a future topic in our Academy site.

 

There are many good technologies available, but a dependence on local testing and local reference projects will hinder and slow down their introduction. An increased readiness to accept the certification schemes for prequalification that exist overseas such as ETA[4] and ICC certification where appropriate, will mean that the technologies can help keep pace with the requirements of the precast industry.

 

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Top 10 Essential Building Products for 2018

Committed to delivering excellence in the construction industry, Halfen Moment Group has selected 10 essential building products which have significantly improve the construction site safety, efficiency, cost and speed. These selected top 10 products have been vastly used by our clients and proven to
i) reduce construction time,
ii) improving construction quality,
iii) increase of lifetime of concrete structures,
iv) reducing of total construction costs.

Mechanical Splices

 1) Having rebar congestion problem during lap splicing? Do you know you can easily eliminate the consequences of 40D rebar of wastage, by saving substantial amount of time and cost? Click to learn more about our Moment® JoinTec Coupler

2) Do you know that you can connect precast concrete elements by using coupler? Used together with Moment’s proprietary 100MPa grout, this coupler is tested to meet seismic requirements and can achieve bar break technology. Click to learn more about our Moment® Half Grout Coupler

3) Ever encounter a site situation where rebar threading is not possible for further rebar connection? A simple step by step execution of cold forged gripping the coupler sleeve against the rebar makes it possible!
Click to learn more about our Moment® Bargrip Coupler

4) Looking for a specific coupler for repair works, especially where one bar is already fixed in concrete with insufficient space? No threading is required and easy to install! Click to learn more about MBC Coupler

Precast Technologies

5) Is the connection between the construction junctions of your precast elements strong enough? Would you like to have a stronger connection with more flexibility? Click to learn more about Moment® Wire Loop Box

6) Looking for a quick, less labor and economical way of solution for connection to foundation or linking columns together? Immediately loadable, hence bracing is not required! Click to learn more about Halfen Column Shoe

Anchoring in Concrete

7) Still using the expensive site drilling method to install a support bracket? Or would you prefer to install a channel via casting, with unlimited adjustment along the line of the channel, and yet safer and more reliable? Better safe than sorry, Click to learn more about HALFEN Cast-In Channel

Reinforcement Products

8) Is your reinforced concrete structure vulnerable to corrosion or early deterioration? Would you like to maintain the proper distance between rebar and form face, yet with a 75% reduction of time? Click to learn more about our Moment® Fast Spacer

9) Facing any cracks issue in concrete due to shrinkage or expansion? Would you like to use macrofiber which is as strong as steel, with increased shatter and impact resistance? Click to learn more about our Forta Ferro® Macrofiber

Sacrificial Formwork

10) Experiencing tedious and slow foundation works? Ever thought of gaining 60% time during foundation works using less labour? Click to learn more about our Speedform™ technology

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Precast Connection Using Moment® Grout Coupler

PanaHome Malaysia Sdn BhdHalf Grout Coupler
Main Contractor: PanaHome Malaysia
Product Supplied: Moment® Half Grout Coupler

Project Description

PanaHome Malaysia uses the Wall-Panel Concrete (W-PC) construction method (a pre fabrication construction method involving large concrete panels moulded at a temporary factory at the development site and later assembled using a crane) to build double-storeys semi-detached innovative eco-homes. This project utilizes the reinforced concrete panel technology to be more environmental friendly, energy-efficient and to ensure consistent high quality building structure.

The Requirement: A mechanical connector to connect the reinforcing bars end to end, suitable for assembling precast elements.

The Solution

The best solution for precast elements connection is the Moment® Half Grout Coupler. With the feature of a threaded end (used for the connection to reinforcement at the precast yard) and a wide cavity to perform a grout connection at site, Half Grout Coupler is designed to provide structural integrity between load bearing precast concrete elements such as columns, beams, shear walls, and panels.

Moment Half Grout Coupler Cast Half Grout Coupler

Moment® Half Grout coupler was mounted on T16 rebar which has been threaded with JoinTec threading which makes the installation easier as the first rebar has been tightly screwed to the couplers before casting. The couplers were installed at the bottom of each precast element, are then cast as part of the precast wall panel element.

Grouting

After bracing the precast panel in its final position, non-shrink grout was injected into the cavity of the coupler to create the rebar connection. Moment® Half Grout coupler requires less usage of grout and is not dependent on any specific type of grout. Different brands of grout can be used, easing local scouring and to keep the costing low. The bracing around the panel was then removed after the grout has attain the prescribed strength.

The Result

Halfen Moment Malaysia proudly supplied more than 50,000 pieces of Moment® Half Grout coupler to this project, which also proves that the use of Half Grout coupler for precast panel is a time-saving and economical way to quickly take advantage of the precast technology.

 

 

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Does The Tightness Between Rebars Determine The Strength Of The Connection? (TRX)

TRX
Developer: TRX City Sdn Bhd
Contractor: Bachy Soletanche
Product Supplied: Moment® JoinTec Coupler, Moment® Bargrip Coupler

Project Description

The Tun Razak Exchange, TRX, is an iconic 70-acre development in the heart of Kuala Lumpur that is set to become a leading centre for international finance and business. The master plan includes a total of 26 buildings and over 21 million ft2 of total building Gross Floor Area (GFA) spread across office, residential, hotel, retail, F&B and cultural offerings. TRX has a development period of 15 years to be completed in phases with the initial Phase 1 slated for completion in 2017/2018.

The Requirement: To connect bended rebars to micropile, which connects to the slab.

The Solution

In order to connect the bended rebars to the micropile, Moment® JoinTec Coupler with Type B thread has been used. The Type B thread has a double thread on one of the bars to be coupled. This facilitates the installation of the system by allowing a coupler to be screwed fully on to one of the bars. When the second bar is ready for coupling, the coupler can now be rotated off one bar and on to the other. In this case study, the full thread has been threaded for the bottom bar which has already cast in concrete.

During the coupler installation of bended rebar to the casted bar of micropile, the contractor realized that the bar cannot be tighten as this bended bar needs to face a specific direction. Fortunately, our specialized engineer visited the site and assured that the tightening is not the main factor which affect the strength of the rebar connection. In fact, the engagement of the thread is the key factor which determine the strength of the connection.

R&D has been made by Halfen Moment on the percentage of thread engagement needed, hence, even if it is slightly looser, the connection will still achieve the BarBreak system. Therefore, 80% of thread engagement has always been suggested to our clients during installation to achieve the full thread engagement.

Micropile at TRXJT Coupler with Bended Bar
Installation of bended rebar to the casted bar of micropile with Moment® JoinTec Coupler

The Result

Halfen Moment Malaysia has currently supplied Moment® JoinTec Coupler & Bargrip Coupler, we believe with our quality assurance and professionalism, there will be more continuous support from Halfen Moment to this prestigious project.

 

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Use Of Toothed Anchor Channels For Facades In Seismic Regions

Over recent years there have been some catastrophic earthquakes around the world. Therefore, it is not a surprise that Singaporean authorities are moving towards seismic design for critical structures such as Hospitals. However, it is important to highlight that designing the structures to withstand seismic actions is only part of the puzzle. In addition to the seismic actions, it is vital that the detailing of the structure, specification of the materials and selection of the products is also taken in to consideration.

In fact, some seismic tests for products are quasi static in nature and do not truly represent an actual earthquake. Therefore, additional tests such as Charpy V-Notch impact tests might also be needed to prove fitness for use in a seismic region.

In the case of a façade anchoring, where a failure can easily see a 200+kg panel falling from the side of a high rise structure, this suitability is especially critical as the current method of anchoring them to the structure usually uses cast in channels that only have high load carrying capacity in 2 axes.

With large lateral ground accelerations during an earthquake, the applied loads in the third axis (along the length of the channel) are much higher when seismic actions are considered. This has led to the development of serrated or toothed channels which have a significantly higher capacity in the third axis.

 

HALFEN CAST IN CHANNEL

 

Anchor Channels are regulated in Europe under the European Assessment Document (EAD) 330008-02-06014 and designed with the standard PrEN 1992-4. In the United States of America they are tested to AC232 – Acceptance Criteria for anchor channels in Concrete5 by the Evaluation Service of the International Code Council (ICC-ES), but currently in Singapore we do not have a certification process and tend to follow the European Technical Assessments (ETAs). These documents all use the same design principles for tension and shear loads perpendicular to the longitudinal axes of the anchor channel. Since February 2016, AC232 also covers loads in the longitudinal axis of the anchor channel and includes the design for seismic conditions allowing their use in all seismic design categories (A – F) provided the channels are capable of providing resistance in all three axes. A common approach to achieve a load capacity in the longitudinal direction is to use the above mentioned serrated channels.

Serrated channels contain teeth along the inside of the channel lips and are used with channel bolts with a matching serration. The channel and bolt serrations create an interlock between the two surfaces which provides a positive connection capable of resisting shear loads in the longitudinal direction of the channel axis. Toothed Anchor Channels have been used in multiple projects worldwide including the anchoring of the curtain wall façade of the Broad Museum in Los Angeles or the Tanjong Pagar Mixed Development project which required particular attention to seismic design.

Plain anchor channels with plain T-bolts can take over longitudinal loads based on the friction between the channel and the T-bolt, but the capacity relies on the torque of the T-bolt. International standards and regulations do not allow friction based connections and thus plain anchor channels in combination with plain T-bolts cannot be used in applications that require longitudinal loading.

Anchor channels with plain and toothed lips and T-bolts

Anchor channels with plain and toothed lips and T-bolts

The design approach as described in AC 232 allows for a design of serrated anchor channels to provide a safe and reliable way to connect façade panels to concrete. The use of the slotted holes will still allow the adjustability required to overcome building tolerances and the absence of welding will increase safety and productivity.

 

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Christmas Quiz Contest- Win A Pair Of Movie Tickets!

 

Quiz1

Ho ho ho! As we start to warm up to the Christmas spirit, Halfen Moment Group would like to give out 20 movie tickets!

Answer 6 questions below and stand a chance to be 1 of the 10 winners to win a pair of Movie Tickets for this coming Christmas!

Quiz

Question #01: What is the name of the product with number 17 placed on the Product Solutions Map of Precast Structure?

Question #02: Name 3 of 6 key drivers on why you should choose Halfen Moment as your Building Solution Provider.

Question #03: Which company in India has given Halfen Moment a testimonial on the ‘commitment towards customer needs and strong focus on ‘Lead with integrity’’?

Question #04: Which are the 5 latest developed products for precast concrete connections?

Question #05: Which product in the Precast Technology Category provides a solution for connection to foundations or for linking columns together?

Question #06: How many threads were produced by Halfen Moment for the Kahramaa, mega reservoir project?

Tips: All answers are available on www.halfen-moment.com! Hurry up!

Send your answers to john.lim@halfen-moment.com along with your name!

Winners will be announced on our website!

 

Updated (15/12/2017)


We are pleased to announce that the winners of the quiz, they are:

1) John Sim
2) Derrick Tee Kai Yang
3) Ling How Ing
4) Irene Wong Bi Xia
5) Nurul Fattiha
6) Nik Moh Shafizul
7) Gwen Loke
8) Katherine Ang
9) Sharrina
10 Mohamad Sahril

Prizes will be winging their way to you before Christmas! And for all of you who needed a bit of help, here is the Quiz Answer Sheet.

Great work everyone, Merry Christmas and wishing all of you a Happy New Year 2018!

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Proud Silver Sponsor of Young Malaysians Go Classic II

YMCG2

Halfen Moment was a proud Silver Sponsor of Young Malaysians Go Classic (YMCG) II, hosted by the Malaysia Belgium Luxembourg Business Council (MBLBC), which ended successfully at Connexion @ Bangsar South on 16 November 2017. 

The YMCG II, a CSR-initiative by MBLBC is all about giving the local community a chance to express themselves through music and allowing all their years of discipline and hard work to mature on a public stage. The main goal is to provide artistic exposure to local communities and future leaders.

Nearly a hundred young musicians and choir members, led by Belgian conductor Sir Dirk Brosse, brought a memorable night of music to nearly a thousand live audiences. This event was held on the occasion of the Belgian King’s Day as well as the 60th anniversary of bilateral ties between Belgium and Malaysia.

Datuk Ahmad Maslan, Vice Minister of International Trade and Industry of China, also made a speech yesterday at the opening ceremony with Belgian Ambassador Daniel Dargent and MBLBC President James De Caluwe.

YMCG2 Press Conference
Musicians brought live performances at the The Young Malaysians Go Classic II press conference held at the Belgium Ambassador’s Residence.

 

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Jointly Held Seminar with Institution of Engineers Malaysia

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Jointly held seminar with IEM at Armada Hotel 

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Token of appreciation from IEM to the speaker, Gary Connah

 

With the close collaboration with IEM Malaysia, Halfen Moment Malaysia succeeded in organizing a half day seminar for the engineers from Civil and Structural Engineering Technical division. The topic conducted was focused on one of our key products, Mechanical Splices, where we presented the different types of mechanical splices available in the market, with different benefits and applications.

The speaker, Gary Connah, Managing Director of Halfen Moment Singapore covered many topics during the workshop and did an outstanding job sharing his 20 years expertise to the engineers, broadening their knowledge on how mechanical splices can play a big role in simplifying the design of reinforced concrete, speeding up construction and reducing the amount of reinforcement required.

More than 70 engineers and customers attended this seminar and Halfen Moment Malaysia would like to thank all who have attended and hope that you had a fruitful and informative session.

Stay tune for more IEM collaboration events next year, and we look forward to meeting you at our next event!

20171107_104456
Inspiring meetings and interest from participating engineers in our products

20171107_112128
Halfen Moment Malaysia Team

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Concept Designs for Kuala Lumpur-Singapore High Speed Rail Stations Unveiled

MyHSR Corp has presented the architectural concept designs for all seven stations of Kuala Lumpur-Singapore HSR in Malaysia including Bandar Malaysia, Bangi-Putrajaya, Seremban, Melaka, Muar, Batu Pahat and Iskandar Puteri. The designs of each station were conceptualised to reflect not only the diverse heritage, culture and identity of each city along the HSR corridor, but also demonstrates the growth vision that will be accomplished with the KL-SG HSR.

Bandar Malaysia- My Gateway

The iconic Bandar Malaysia station is the first station for the KL-SG HSR, acting as a gateway to Malaysia and will connect with mass rapid transit, commuter and airport rail. The Bandar Malaysia station design geometrics are inspired by the confluence of Gombak River and Klang River, resulting in an innovative design that carries Malaysia into the next century.

hsr01

Bangi-Putrajaya- My People

The Bangi-Putrajaya station is inspired by the official religion, Islam, and its beautiful architecture that can be seen in mosques in the country. This station envisions Malaysia’s aspirations as a progressive nation, articulated by the pointed arches standing united, together.

hsr02

Seremban- MyVision

A station in the park at the heart of the Malaysian Vision Valley, the Seremban station combines elements of green beauty, futuristic development and proud heritage of the Sri Menanti Palace that served as a palace for the Royal family of Negeri Sembilan.

hsr03

Melaka- MyHeritage

The Melaka station is inspired by the bustling Straits of Malacca connecting the Indian Ocean and Pacific Ocean as the main shipping channel. The station design geometrics have a modern take on sails, from Melaka’s historical roots as a thriving shipping port to a futuristic vision of Melaka.

hsr04

Muar- MyFuture

The ‘rehal’, a book rest used when reciting the Quran, symbolises Muar’s instrumental role in Malaysian history; home to numerous academic and political leaders. Muar continues as the centre of education and development within Malaysia, which seeks to be the newest hub of higher learning.

hsr05

Batu Pahat-My Culture

The Batu Pahat station is inspired by a prominent local culture of Johor known as the ‘Kuda Kepang’ dance, that is accompanied with traditional musical instruments when performed. The dance is a regular fixture at celebrations and grand occasions in Johor.

hsr06

Iskandar Puteri-My Encounter

Iskandar Puteri is the last station in Malaysia before the border-crossing, which signifies the role of borders as a meeting place between people and culture. The station design geometrics are inspired by the gesture of a handshake.

hsr07

Source: HSR Corp

 

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Top 10 facts KL-SG HSR Stations

10 Things To Know About The Kuala Lumpur-Singapore High Speed Rail

HSR Railway
First conceived in 2013, the Singapore-Kuala Lumpur High Speed Rail (HSR) has been four years in the making. Malaysian Prime Minister Najib Razak signed an agreement with Singapore Prime Minister Lee Hsien Loong in Putrajaya on July 19 2016. The rail project has been billed as a “game-changer” that will boost connectivity, strengthen economic ties and forge closer ties between people of both countries.

Here are 10 points to note about the HSR project:

Estimated Operational Date

The Express Service, which links Kuala Lumpur and Singapore, is targeted to commence by end of 2026.

8 Stations

The line will consist of 8 stations, 7 of which will be in Malaysia, 1 in Singapore.

The planned stations are Kuala Lumpur, Putrajaya, Seremban, Ayer Keroh, Muar, Batu Pahat, Iskandar Puteri and Jurong East. The Singapore station will be located at Jurong East, where Jurong Country Club is currently located.

350km Total Distance

The project will involve the construction of a brand-new line with dedicated tracks, which will allow trains to reach a maximum operating speed of 320km/h; 335km of the track will be set in Malaysia, with the Singapore stretch spanning 15km.

Shorter Travel Time

The HSR is expected to trim travel time to just 90 minutes, compared with the four to five hours needed to travel by road between Singapore and Kuala Lumpur.

HSR Travel Time Comparison

3 Services With 2 Separate Operators

The HSR system will consist of 3 services, helmed by 2 different operators, OpCo International and OpCo Domestic. The Express and Shuttle services by OpCo International will consist of the Kuala Lumpur to Singapore stations stretch and the Iskandar Puteri and Singapore stations stretch respectively.

The Domestic service will consist of stations within Malaysia only, from Kuala Lumpur to Iskandar Puteri stations. Having 2 different OpCos will allow the HSR to better cater to the different needs of their passenger profiles. OpCo Domestic will also give Malaysia more flexibility to regulate its own internal service. The Express and Shuttle service will be given scheduling and operational priority over the Domestic Service.

Each Country Is In Charge Of Its Own Stations And Infrastructure

The Singapore and Malaysia governments will be responsible for developing, constructing and maintaining the civil infrastructure and stations within their own countries.

This will be undertaken by MyHSR Corporation in Malaysia and the Land Transport Authority (LTA) in Singapore.

Implementation Of A Bilateral Committee

A bilateral committee will have oversight over all matters that may affect the express and shuttle services.

A working-level joint project team will also handle all matters that require coordination and joint engagement between Singapore and Malaysia.

Co-located CIQ Concept (Seamless Travel)

Both nations have agreed that the Singapore and Malaysia Customs, Immigration & Quarantine (CIQ) facilities will be co-located at three locations – Kuala Lumpur, Iskandar Puteri and Singapore.

International-bound passengers will need to go through CIQ clearance by both Singapore and Malaysia authorities only at the point of departure, ensuring swift and seamless travel.

HSR CIQ Clearance

Biggest Challenge: Line's Alignment In Malaysia

The finalizing of the line’s alignment in Malaysia will be the biggest challenge as there could be potential risks if environmental concerns and land acquisition. Although the HSR line between Singapore and Malaysia has an ambitious 10-year deadline to get the system up and running by Dec 31, 2026, experts said that it was achievable as long as construction starts by 2021, at the latest.

What they believe is tougher is the drafting of the tender documents and contracts before 2021, as well as the biggest challenge of finalizing the line’s alignment of the 350-kilometre long route, much of which is in Malaysia.

Round Trip Under RM400

Ticket prices for a one-way trip between KL and Singapore on the proposed HSR line could cost commuters “less than RM200,” according to a report by the News Straits Times, citing Malaysia’s Land Public Transport Commission (SPAD). Return trip tickets, on the other hand, could cost “under RM400” to “accommodate all market segments, including business and leisure travelers,” according to Mohd Nur Ismal Mohamed Kamal, CEO of SPAD.

In Singapore, prices are expected to hover around S$80-90 for a trip, though it is unclear as to whether or not said fare includes a return journey.

 

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