Formwork is the term used for the process of creating a temporary mould for concrete to be poured into and formed.
With Formacon, you can be assured the experts in the formwork field will provide you with the best quality formwork in Gauteng.
Formacon was established in 2004. We pride ourselves in our rapid growth, becoming the most preferred company of all formwork construction businesses in Gauteng. Hiring an experienced, professional and competent contractor like Formacon, is already a step in the right direction. With years of experience in formwork, and a large client basis, Formacon is the contractor of choice.
When it comes to formwork, one of the key factors to ensure success and achieve objectives as planned, is to have the correct contractor. Formacon delivers expert solutions for scaffolding and formwork to the construction industry.
When it comes to formwork, there are several different types. To name only a few:
- Wall Formwork
- Beam Formwork
- Column Formwork
Wall formwork is much simpler than other concrete units. The forces against the wall formwork are less. Most of the load is being carried vertically downwards. Panels on both sides are held in place by ties. A form tie is an accessory used in formwork, used to hold the concrete wall forms firmly against the lateral pressure of freshly placed concrete. They maintain equal space between the forms which results in uniform thickness of walls. The ties are also used as spacers.
Beam Formwork - creates a timber formwork around a beam. This is a highly versatile timber beam formwork system. Adaptable to different slab geometries; it is simple and easy to assemble. Formwork takes the form of a three-sided box which is supported and propped in the correct position and to the desired level. Beam formwork consists of open through sections and because it is not closed at the top requires a more supporting framework to restrain the sides. The supports need to be maintained to the soffit (the underside/bottom horizontal portion of a beam) and provide lateral support to the sides.
Column formwork is made usually with either timber or metal panels. Column formwork is comprised of panel formwork elements or based on individual formwork girders. The column formwork systems now available are normally modular in nature and allow quick assembly and erection on site minimizing labour and crane time.
The principle is to create an enclosed box with frames with the exact size of the column and fix it tightly on the kicker left from the base or at the last stage of column concreting. The box is held in position by steel column clamps or bolted yokes and supported by props. Similar to beam formwork, the sheeting of column formworks is prefabricated according to the column dimensions from sheeting boards connected by cover straps.
The sheeting panels are placed in a foot rim which is anchored in the soil by steel bolts.
The foot rim consists of double-nailed boards. The foot rim must be exactly measured-in because it is decisive for the exact location of the column. It has the same functions as the thrust-board for foundation or beam formwork.
Around the arch timbers, which have the function of walers, column clamps of flat steel are clamped with wedges or a rim of boards is arranged, similar to the foot rim. Additional formwork tying by tie wires or steel screws is not necessary.
The distances of the clamps are specified in the formwork project. Normally they are approximately 700 mm.
Timber for Formwork should have the following requirements
1. Well Seasoned
2. Light In Weight
3. Easily Workable With Nails Without Splitting
4. Free From Loose Knots
The timber used for shuttering for exposed concrete should have smooth and even surface on all faces which come in contact with concrete.
Resin bonded plywood sheets are attached to timber frames to make up panels of required sizes. The cost of plywood Formwork compares favourably with that of timber shuttering and it may even prove cheaper in certain cases:
1. It is possible to have a smooth finish in which case on cost in surface finishing is there.
2. By use of large size panels, it is possible to effect saving in the labour cost of fixing and dismantling.
3. Number of reuses are more as compared to timber shuttering.
This consists of panels fabricated out of thin steel plates, stiffened along the edges by small steel angles. The panel units can be held together through the use of suitable clamps or bolts and nuts. The panels can be fabricated in large numbers in any desired modular shape or size. Steel forms are largely used in large projects or in situations where a large number of reuses of shuttering is possible. this type of Formwork is considered most suitable for circular or curved structures.
1. Steel forms are stronger, durable and have a longer life than Timber Formwork and their reuses are more in number.
2. Steel forms can be installed and dismantled with greater ease and speed.
3. The quality of exposed concrete surface by using steel Formwork is good and such surfaces need no further treatment.
4. Steel Formwork does not absorb moisture from concrete.
5. Steel Formwork does not shrink or wrap.
Construction of Concrete Formwork
This normally involves the following operations:
1. Propping and centring
3. Provision of Camber
4. Cleaning and Surface Treatment
Order and Method of Removing Formwork
The orders and method of the removal of Formwork are as follows:
1. Shuttering forming the vertical faces of walls, beams and column sides should be removed first as they bear no load but only retain the concrete.
2. Shuttering forming soffit of slabs should be removed next.
3. Shuttering forming soffit of beams, girders or other heavily loaded shuttering should be removed in the end.
Rapid hardening cement, warm weather and light loading conditions allow early removal of Formwork. The Formwork should under no circumstances be allowed to be removed until all the concrete reaches the strength of at least twice the stresses to which the concrete may be subject at the time of removal of Formwork. All Formworks should be eased gradually and carefully in order to prevent the load suddenly transferring to the concrete.
Formwork Construction serves as a mould for concrete structural components. Formwork must be available when the necessary steel reinforcements and concrete mix are placed. Proper use of Formwork Construction decides on the accuracy to size, strength and surface finish of the construction such as:
• Solid structures (foundations, columns...)
• Structures with special functions (containers, chimneys...)
• Structures to meet great statical requirements (Bridges, Towers...)
• Reconstruction of Structures
Each type of Formwork is of provisional nature and is removed after the hardening of the concrete places. Formwork Construction is built as strong as possible for the structure it is intended for. Formwork stripping is always kept in mind when erecting, and Formacon recycles most of the components. Proper Construction Of Formwork is a must, as if it is done incorrectly, it can give way when the concrete in places, resulting in heavy material damage and can cause serious injuries to persons on site.
Formacon is the leader in Formwork construction and ensuring that everything is done to standard and more. Contact Formacon today to find out more on how we can assist you on your next building project.
Formwork panels consist of three layers of wood obtained from sustainable forests, which are glued together in a watertight bond. This guarantees dimensional stability and swelling and shrinking is basically excluded. These high-quality boards can be used up to 20 times on a construction site, and therefore reduce Formwork and scaffolding costs to a minimum.
Areas of Application
• Concrete Formwork systems
• Wall Formwork
• Floor Formwork
• Formwork for engineered structures (bridge constructions, foundations)
• Tunnel Formwork
• Almost no cracks will happen
• High bending strength and stiffness
• Lower costs due to a higher number of reuses
• High endurance due to glueing all around
A building’s foundation forms the basis for the building structure. It is the part of the building which is direct contact with the soil and transfers the load of the building to the soil safely. There are mainly two types of foundations – Deep foundations and Shallow foundations and the type of building which will be constructed as well as the soil quality and construction materials to be used, will determine the type of foundation which will be cast.
Foundation Formwork in concrete construction is used as a mould for a structure in which fresh concrete is poured to harden. Types of formwork construction depend on the material and type of structural element.
Formwork can be named based on the type of structural construction such as slab formwork for use in slabs, beam formwork, column formwork for use in beams and columns respectively.
The construction of Foundation Formwork takes time. The operation of removing the formwork, after the concrete has cured, is known as stripping. Stripped formwork can be reused. Reusable forms are known as panel forms and non-usable are called stationary forms.
A Good Foundation should satisfy the following requirements:
- It should be strong enough to withstand all types of dead and live loads.
- It should be rigidly constructed and efficiently propped and braced both horizontally and vertically, in order to retain its shape.
- The joints in the formwork should be tight to avoid leakage of cement grout.
- Construction of Formwork should permit removal of various parts in desired sequences without damage to the concrete.
- The material of the Formwork should be economical, easily available and should be suitable for reuse.
- The Formwork should be set accurately to the desired line and levels.
- It should be as weight as little as possible.
- The material of the Formwork should not warp or get distorted when exposed to the elements.
- It should rest on a firm base.
Economy in Formwork
The following can be implemented to minimize the cost of Foundation Formwork:
- The design of the building should imply a minimum number of variations in the size of rooms, floor area etc. in order to maximize reuse of the formwork throughout construction.
- Design should be perfect to use slender sections only in the most economical way.
- Minimum sawing and cutting of wooden pieces should be made to enable maximum reuse of material.
Foundation Formwork can be constructed out of timber, plywood, steel, precast concrete or fibreglass used separately or in combination. Steel forms are used in a situation where a large number of re-use of the same forms are necessary. For small works, timber formwork proves to be more cost-effective. Fibreglass made of precast concrete and aluminium are used in cast-in-site construction such as slabs or members involving curved surfaces.
For more information on Foundation Formwork, contact Formacon today.