September 29, 2019
Formwork is a temporary structure that supports part or the whole of a permanent structure until it is self-supporting. Once assembled the components form the temporary structure. The most common method of keeping the formwork in place during casting is to use a supporting scaffold system. When scaffolding cannot be used, lifting equipment can be used instead. Bygging-Uddemann has the most comprehensive systems in the business for this kind of works. Our systems are suitable for practically all kinds of heavy loads whose placing or removal require a high degree of precision.
As construction methods evolve, the use of lifted formwork / formwork for heavy lifting equipment has become common among the leading construction companies in the world. Generally, strand climbers and hydraulic steel rod climbers are used for lifting and lowering of formwork. Construction projects requiring formwork are lifting of roof and steel structures, cranes, bridges, bridge sections and more.
Let’s learn more about formwork for heavy lifting equipment, the material types and requirements for a good formwork.
Types of formwork materials
Many different kinds of concrete formwork are used in construction. The type of formwork system used for construction largely depends on important factors such as the types of the structure to be built, as well as the material to be used. Some of the different types of well-known formwork are slab formwork, column formwork, beam formwork and more.
Timber and plywood are used in traditional timber formwork to form the pouring moulds. While this method is cheaper, it isn’t as effective because wood is not as strong and durable as metal or steel. The timber should be lightweight, well-seasoned, easily workable with nails, as well as free from loose knots. Still, complicated sections of buildings requiring great attention to detail, utilize timber formwork.
Engineered formwork: steel, aluminium & plastic
Generally, prefabricated moulds made from metal frames of steel or aluminium are used in engineered formwork systems. It is cheaper and quicker to use than traditional formwork. The added benefit is that these frames are extremely cost-effective, strong and durable, and rarely need replacement. The construction of engineered formwork is faster and requires less manpower, saving time and money. Simple structures can be built with reusable plastic formwork systems, consisting of interlocking, lightweight and strong systems.
Stay-in-place formwork is used for supporting parts of a structure. This type of formwork consists of insulating concrete forms that are filled with reinforced concrete and are left in place once they are set.
Last but not least, concrete formwork is what is mostly used in modern construction. Although there are different types of formwork available today, concrete is the preferred option. When reinforced, concrete is a virtually indestructible material, making it the perfect choice for major construction projects, as well as small, complex and detailed structures.
Formwork construction should be efficient enough to be able to retain its original shape. When it comes to formwork, construction businesses should be able to select the type most suited to the structure to be built. While there are many formwork systems available for use today such as beam, column, plastic, slip form, cassette, climbing, flexible and horizontal formwork, the last option is found to be the most widely used.
Requirements of a good formwork
Good formwork should satisfy all the following requirements listed below:
- Should be strong enough to withstand all kinds of dead and live loads
- Should be efficiently braced and propped both horizontally and vertically, to retain its shape
- The joints in the formwork should be able to prevent cement grout leakage
- Construction of formwork should permit removal of various parts in desired sequences without concrete damage
- The material of the formwork should be easily available, affordable and suitable for reuse
- It should be set accurately to the desired line
- It should be as light as possible with reusable material
- The formwork material should not warp or get distorted when exposed to the elements.
- It should rest on a firm base and be levelled on a plane surface
- Must have high-quality workmanship and regularly scheduled inspections
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With rapid technological advancements, it has become easier for contractors to make formwork because they can design it electronically and then copy the designed mold for faster and quicker construction. Only formwork companies can handle doing a formwork because the concrete weight needs to be supervised with caution and the finer points need to be evaluated correctly to make it favourable for building construction. Businesses can research and opt for reputed formwork services in Sweden such as Bygging Uddemann to help reach a more detailed understanding of the process.
August 1, 2019
The number of techniques being used in the construction industry is only increasing. The industry as a whole is constantly making an effort in using equipment that makes the process of construction easier as well as faster. One such equipment that assists companies in carrying out various processes of construction is a skidding system.
Skidding systems are ideal for moving industrial objects and installation irrespective of the size and weight to various locations. For many tasks, they are a much more safe and effective solution than cranes. Due to its user-friendliness, the business of hydraulic skidding system providers is on a rise as more and more companies are making use of it.
How Does a Skidding System Work?
Construction companies happen to undertake processes that involve carrying heavy loads from one location to another. This is where skidding systems play a major role. A skidding system is designed in a way to carry out safe and precise movements of heavy materials. The main attribute of this system is that it can move materials and structures even in confined and restricted environments.
Essentially, the equipment consists of jacks (for pushing & lifting) sitting on a base plate. The base plate has low friction pads attached underneath for sliding on the transfer lane’s steel track. Each unit is small, but with large lifting power and linked with several units, enormous lifting forces can be achieved. Skidding systems have the capability of carrying out a wide range of functionalities since they have the option of combining several units to create the most suitable system for moving complex loads.
Features of Hydraulic Skidding System
It is certainly true that construction equipment is structured in the form to make processes easier to conduct. Just like that, a hydraulic skidding system also has a list of characteristics that it is made of. Listed below are some of the exceptional features that differentiate it from other equipment.
Ability to Move Extremely Heavy Loads
Low Maintenance Cost
No external force required
Safe gripper release
Types of Skidding System
There are primarily two types of skidding systems that companies make use of. The model is classified into Heavy Track and Low profile. Both the systems are equally safe and proficient in moving heavy loads, but depending upon the application of the particular model, companies can make a choice.
Heavy Track Skidding System – These systems are made for more rough use. They can be best used on field conditions or tracks that are a span of unsupported distances. Heavy track models can be used for loads from railcars to transporters, or across open areas or on uneven ground.
Low Profile Skidding System – Low profile models are designed for moving loads where there is restricted access or overhead clearance and good surface conditions, like well-supported surfaces. All components of this system are hand-portable and easy to transport.Continue reading →
July 19, 2019
With a myriad of technological advancements, the construction industry is continually evolving. From introducing new methods for construction of different structures to developing and utilizing machines that greatly reduce the risk factor, this industry has reached heights never thought possible before. The use of formwork for lifting heavy equipment is one such discovery that has generated a great demand in the construction industry nowadays.
What is Formwork?
Typically formwork is temporary or permanent molds into which materials such as concrete or other similar materials are poured. When it comes to concrete construction, the shuttering moulds are supported by the falsework supports the shuttering molds. Concrete is now universally considered to be the most suitable material for construction, due to which its use in the construction of bridges, buildings, other structures has risen tremendously. There are multiple benefits of opting for concrete as compared to other materials. Some of them include its useful capability of withstanding high temperatures that ensure protection against fires. Hence a formwork system is ideal for construction. The system is used to hold and store wet concrete until an important construction process called curing is completed.
What are the Different Kinds of Formwork?
The type of formwork system that can be used for construction largely depends on important factors such as the types of the structure as well as the material to be used. Some of the different types of formwork are called slab formwork, column formwork, beam formwork and more. Formwork for lifting heavy equipment must possess the following characteristics:
- It should be sturdy, light and durable
- It should be able to rest on a firm base
- It should be able to withstand extremely high temperatures
It goes without saying that formwork construction should be efficient enough to retain its original shape. When it comes to formwork, construction businesses should be able to select the type most suited to the structure to be built. While there are many formwork systems available for use today such as slip form, cassette, climbing, flexible and horizontal formwork, the last option is found to be the most commonly used.
With the construction boom, new types of materials are constantly flooding the market that are cost-effective, lightweight or durable. Nowadays, businesses prefer to opt for materials such as aluminium, steel, and fibreglass. The lighter and smaller horizontal formwork system utilizes such materials for construction. It comprises a series of preformed interconnected decking panels and falsework bay that are generally used in the construction of slabs. Being a much lighter and safer option, this system is an ideal choice as compared to traditional options. Business can research and opt for reputed formwork services in Sweden that can help to reach a better and more detailed understanding of the process.Continue reading →
May 2, 2019
In mid-April our expertise was requested for a boat recovery operation in Klarälven river, Karlstad, Sweden.
The background to the request is that 23th of January, the nightclub and restaurant boat “Båten” sank, for reason yet unknown. Fortunately there were no injuries in the accident.
We presented a solution with 24 wire jacks of the type T-15 and last week our equipment was in place. Thursday morning (25/4) our supervisors were able to start the lifting action and later same day the boat was sucessfully recovered. Read more about the operation here! (Swedish)Continue reading →
March 29, 2019
Det finns flera olika komplicerade faktorer vid byggandet av en bro, exempelvis kanske bron ska byggas över en trafikerad järnväg eller över vatten. Då behöver bron byggas i närheten eller vid sidan av den slutgiltiga platsen för konstruktionen och den här metoden kallas för brolansering. Efter att vissa arbetsmoment och delar av bron är färdig dras de ut till sin slutliga position och för brolansering krävs utrustning av hög kvalité som klarar extrema väderförhållanden, från kalla nordiska vintrar till varmt ökenklimat.
Så gjuter man betongen för broar
De traditionella byggteknikerna fungerar tyvärr inte på alla projekt som exempelvis vid brolansering och glidformsgjutning har blivit ett speciellt sätt att gjuta betong. Det börjar med tillverkning av en glidform på bottenplattan och sedan fylls formen på med betong och armeringsjärn. Allteftersom betongen stelnar flyttas glidformen ett steg uppåt och detta sätt är mer ekonomiskt och effektivt än de traditionella metoderna.
Konstruktioner med stöd
Beroende på byggprojekt krävs olika typer av brolansering och utrustning. Kassuner har länge använts för att underlätta arbetet och ordet kassun kommer från franskans caisson som betyder låda. Dessa är en viktig förutsättning när delar av arbetet ska utföras under vattenytan och det ska ske på ett säkert, smidigt och effektivt sätt. Vanligen byggs kassunen på plats och förflyttas sedan till rätt position under vattenytan och dagens stora kassuner väger flera hundratals ton vilket gör förflyttningen komplicerad. Det krävs kompetens och speciell utrustning för att utföra tunga lyft.
Montering och lansering av överbyggnaden
När bron befinner sig på den slutliga positionen ska den vanligtvis förses med en överbyggnad i betong och sedan beläggas med asfalt. Efter det utförs arbeten som montering av räcken och belysning.
Slutliga finslipningar och kontroller
Grunden i brolansering är att delar eller hela bron byggs vid sidan av eller i närheten av dess slutgiltiga position och sedan flytta hela eller delar av bron ut till sin rätta plats. Själva lanseringen sker när det stör trafiken så lite som möjligt, exempelvis under nattetid. Metoder för att horisontell förflyttning ska bli mer effektiv och säkrare utvecklas ständigt och en ny metod som har nått stor framgång är en kombination av tunga lyft med hydrauliska lyftare och skidding-teknik. Metoden minskar på antalet rörliga delar och istället för att använda traditionella lager används en skidding-teknik med låg friktion.
Hitta företag som hanterar brolansering och utrustning i Sverige
Byggandet av en bro brukar vara komplicerade projekt med många regler och komplicerade faktorer att ta hänsyn till. I Sverige finns flera företag som har gedigen erfarenhet och kunskap om brolansering och utför arbetet på ett säkert och effektivt sätt. Kvalité och säkerhet är de viktigaste faktorerna och våra tjänster erbjuder skräddarsydda lösningar efter kundens behov och projektets mål.Continue reading →
February 26, 2019
In the caisson construction process, a caisson is a wasterlight structure that uses an anchor for foundation. It usually carries the building loads at the lower ends which are shaped as a bell. Caissons are generally constructed of concrete, steel, or wood. As with any construction project, the material to be used will depend on the function of the caisson and the type of caisson being constructed.
Caisson construction services include a whole procedure of pre construction, during construction and post construction. On completion of the caisson system there is a provision of engineered drawings to make the process appear wholesome.
Considering all the processes of construction, a caisson is said to be a critical component since it provides stability. Where the ground can, and will, shift under the weight of a new structure, a caisson can be used to distribute its load evenly.
The Caisson Construction Process
Following are the step to be followed to build a caisson:
- After some initial formwork and concrete pours, the cutting edge is floated to the breakwater by towboat and fastened to the caisson guide. Concrete is placed into steel forms built up along the perimeter of the box. With every concrete placement, the box becomes heavier and sinks into the water along the caisson guide.
- Forms are also built inside the box around the air domes and concrete is placed in between. The resulting open tubes above the air domes are called dredge wells.
- When the caisson finally touches the river bottom, the air domes are removed and earth is excavated through the long dredge well tubes, as shown in the animation below. The caisson sinks into the river bottom. Excavation continues until the caisson sinks to its predetermined depth.
- As a final step, concrete is placed into the bottom of the hollow dredge wells and the tops are sealed.
Conditions Requiring Caisson Construction
Below mentioned are some of the common instances for caisson construction:
- When the soil contains large boulders, which obstruct penetration of piles
- A massive substructure is required to extend to or below the rear bed to provide
resistance against destructive forces due to floating objects and score etc
- A massive substructure is required to extend to or below the rear bed to provide
- The foundation is subjected to a large lateral load
- Depth of water level in the river and sea is high
- There are river forces included in the load compositions
- When the load is needed to carry at the end, caissons are preferred
- The present groundwater level is aggressive inflow, caissons are suitable
Essential Requirements for Caisson Construction
There are a number of requirements for caisson construction that exist for the purpose of sinking, filling and sealing. The most crucial factors include the height of the concrete lifts and length of the reinforcement bars that need to be decided upon in consultation with the construction contractors.
To ensure the maximum assistance of operations, the on-site supervisory staff must maintain the highest standards regarding the quality of materials used in the process. More so, they must be specially trained to handle the challenging situations faced by the personnel during the sinking process of the caisson construction. This will not only make the construction process faster but also ensure safety of the workforce at all times. As it is the case with anything in construction, caisson construction needs to be done with great precision and accuracy for successful results.Continue reading →
January 31, 2019
The bridge launching method is also known as the incremental launching method. It is used for bridge decks that are greater than 250 m in length. In the bridge launching method of construction, the bridge deck is made in sections. This is done by pushing the structure of the bridge outwards using abutments towards the pier.
The incremental bridge launching method needs a considerable amount of analysis and design expertise. It also requires specialized bridge launching machine. This method is most suited for constructing bridges that have a constant radius of curvature. It is a very fast method of construction.
Bridge launching for construction
In the beginning of the construction, a highly mechanized prefabrication deck mould is set up behind one abutment. By doing this, there is no need for temporary support. After this, a rigid framework is attached. This enables the production of cast-in-situ segments. The in-situ deck segments can range anywhere from 5m to 30m in length.
After each segment is complete, it is placed on sliding bearings. Then, it is pushed through into the span. Also, a steel nose is placed in front of the first span formwork. This gives way for all necessary deck cantilever length while the span reaches the first pier.
The average rate of construction using the bridge launching method is 30m a week. The bridge launching method of construction becomes worthy of consideration for project sites that face some challenges. The challenges are:
1. Steep slows or deep valleys. This makes the delivery of materials difficult
2.Deep water crossings
3.Limited or prevention of access due to environmental restrictions
4.Limited access to area beneath the bridge construction. This could be because of heavy traffic on roadways or railways
To simplify fabrication and construction, the bridge that is supposed to be constructed using incremental bridge launching, is designed along a tangent alignment in both horizontal and vertical planes. The bridge sites that fit these ideal conditions are rare. This is especially the case when this scenario is combined with the close proximity of any of the site restrictions listed above. This makes it a more challenging process. It is still possible to construct a bridge along a curved alignment though, in either or both the planes.
It is a necessity for the construction surfaces to remain perfectly aligned with the superstructure, especially during the launch of operations. This is done to eliminate the relocation as well as the adjustment of lateral bearings.
Things to consider when using the bridge launching method of construction
1.There should be proper communication channels set between the contractor, monitoring consultant as well as the structural designer to monitor the to-be launched bridges.
2.There should also be a comprehensive monitoring program implemented. This can be used to alert either the contractor, consultant or designer in case something goes wrong.
3.There should be a pre-launch and post-launch survey of the structure.
4. There should be proper methods of monitoring the plumbness of the piers during the bridge launching and after
There are a lot of other things to be monitored during the bridge launching and after. Some of these are as follows:
1.The structural response of the piers
2.Touchdown forces during the bridge launching as well as the passage of the main structure over the pier
3.Girder flexural behaviour during the bridge launching
4.Load transfer mechanism that comes between girders
5. The horizontal force that is necessary for launching different stages of construction
January 29, 2019
January 29, 2019
January 14, 2019