Formwork Props

Formwork Props

Formwork props are height-adjustable steel or aluminium prop jacks that support formwork systems in slab and wall formwork construction. They are modular scaffolding materials with pre-designed components of holed inner tubes with top plates, outer tubes with prop sleeves and bottom plates, prop nuts, and prop lock pins (G Pin or straight pins).

Formwork props have the following features:

1. Adjustable in height/length
2.  Modular with Inner Tube, Outer Tube, Plates and Prop Nut, Lock Pins
3. Designed to take different load capacities according to the construction bearing requirements.
4. Stand independable
5. Easy to set up in the shoring system
6. Suitable for projects with various slab/beam heights at the same time

Steel Formwork Props &  Alumimium Formwork Props

According to the raw material, formwork props include steel props and aluminium props.

Adjustable steel formwork props are more popular in concrete construction because they are cheaper and can support more weight.

Steel formwork props are easier to rust than aluminium props. Thus, steel props need extra surface protection to prevent corrosion. The surface protection includes paint, powder-coated, zinc-plated (E-gal), and hot-dip galvanised (HDG). Steel props can also be made from galvanised tubes.

Painted and coated steel props can be customised in red, grey, purple, silver, etc.

Gal steel props are in silver.

Slab and Wall Formwork Props

The slab prop is the most common formwork prop for concrete construction. It supports concrete slabs and beams vertically in concrete shuttering work.

In the formwork construction, the slab prop’s bottom plates stand on the ground/floor, while the top flat plates connect with the formwork top heads(adjustable or fixed U head or fork head) and then support formwork beams. The slab prop’s top plate can also be a U-shaped or fork head plate.

Slab formwork prop standard (normal) heights range from the lowest 1.04m to the highest 5.5m. Customised heights are available. The load capacity of the slab formwork props can be designed for light, medium, or heavy duty.

Wall Formwork props are also called bracing props or push pulls. They diagonally support the wall formwork system panels. The push-pull can be used in double or single configurations in the wall shoring.

Slab Prop Quantity Calculation

How many slab props are needed for your construction? You need to consider the following impact factors:

1. The slab thickness and the concrete weight
2. Slab prop arrangement
3. Slab prop load capacity
4. Safety Factor

Calculation Example:

1. Slab Size: 12m (L) x 8m (W) x 0.15m (Thick)
2. Block Dimension: 150mm x 225mm x450mm
3. Unit Weight of Concrete: 24 KN/m³
4. Formwork Load: 0.5KN/m²
5. Unit Weight of Black: 20KN/m³
6. Floor to Soffit Height: 2.85m
7. Spacing of Formwork Slab Prop: 1.0m x 1.0m
8. Formwork Slab Prop Safe Work Load (SWL): 24 KN at 2.85m

Calculation

• Dead Load (GK): Slab Self Weight + Formwork Self Weight + Load From Block

1.                 Slab Self Weight = Unit Weight of Concrete x Slab Thickness = 24 KN/m³ x 0.15m = 3.6 KN/m²
2.                Black Load = Unit Weight of Black x Slab Thickness = 20KN/m³ x 0.15m = 3.0 KN/m²
3.                Formwork Load = 0.5 KN/m²
4.                Dead Load (GK) = 3.6 +3.0 + 0.5 = 7.1 KN/m²

• Live/Imposed Load (QK) = Workers & Tools = 1.5 KN/m²
• Compute Ultimate (W) = 1.4  GK + 1.6 QK (Note: BS810.4 Standard Safety Rule)

Ultimate Load Requirement W = (1.4 x 7.1) + (1.6×1.5) = 9.94 +2.4 = 12.34 KN/m²

• Prop Safety Calculation

1.             Prop safety work load = 24 KN   @ 2.85m
2.            Prop Space: 1m x 1m
3.            Safety Factor: 70% of SWL of Props = 0.7×24= 16.8 KN
4.           Slab Ultimate Load = 12.3KN. Less than the prop safety load 16.8KN
5.          Conclusion: The Formwork Prop Design is Safe.

• Prop Quantity Calculation

1.  Props Quantity Along 12m Length (1.0m Span):  12m ÷ 1m +1 = 13 pcs of props
2. Prop Quantity Along 8m Width (1.0m Span): 8m ÷1m + 1 = 9 pcs of props
3. Total Prop Quantity: 13 x 9 = 117 pcs of Props
4. Add 10% Contingency = 117×1.1 = 128.7 pcs of props ≈ 130 pcs of props

Popular Formwork Prop Types and Sizes

Formwork props are an accessory that plays an important role in cast-in-place concrete construction. There are three types of formwork props.

• Acrow Props
• Shoring Props
• Post Shores

Acrow Formwork Props  (Size 0# to 4#)

The acrow props are also known as acro props or acro jacks. They are a typical formwork props that with 48mm diameter of inner tube and 60mm diameter of outer tube, a short prop sleeve (about 200-350mm) integrated on the prop outer tube, a cast steel or forged prop nuts on the props sleeve for slight height adjustment, top and bottom plate welded on the inner tube and outer tube, a lock pin (G shaped or straight shaped) locking the props at a required height.

Acrow formwork props are designed in five sizes, ranging from 1050mm to 4900mm. Incliude size 0# to 4#. Size 0# is the shortest acrow prop, while size 4# is the longest/highest acrow prop in the acro propping system.

• Size 0: 1.014m Closed, 1.829m Fully Open
• Size 1: 1.753m Closed, 3.124m Fully Open
• Size 2: 1.981m Closed, 3.352m Fully Open
• Size 3: 2.590m Closed, 3.962m Fully Open
• Size 4: 3.200m Closed, 4.876m Fully Open

Shoring Props (Light Duty Telescopic Steel Props)

Formwork Post Shore

Post shores are typically heavy-duty, adjustable formwork props with an extremely high load capacity. They are used in thick slab and beam concrete in commercial, industrial and plant construction. Post shores are typically steel types used in the USA and Canada, also known as shore posts.

According to the weight classes, there are four classes of shore posts: Post I, Post II, Post III and Post IV.

Post Shores I

The Shore post I has an inner diameter of 1.9″ and an outer diameter of 2.38″.

Code No.	Adjustable Length	Internal Tube	External Tube	Weight
PS00HI	3’6-6′	1.9×0.126	2.38×0.09	31LBS
PS01HI	5’6-10′	1.9×0.126	2.38×0.09	43LBS
PS02HI	6’6-11′	1.9×0.126	2.38×0.09	45LBS
PS03HI	8’8-13’2	1.9×0.126	2.38×0.09	52LBS
PS04HI	10’6-16’3	1.9×0.126	2.38×0.09	60LBS

Post Shores II

Shore Post II has an inner tube diameter of 2.38″ and an outer tube diameter of 2.75″.

Code No.	Adjustable Length	Inner Tube(O.D)	Outer Tube(OD)
PS01HII	5’7-9’6	2.38 Inch	2.75 Inch
PS02HII	7’3-12’10	2.38 Inch	2.75 Inch
PS03HII	8’10-16’1	2.38 Inch	2.75 Inch

Post Shore III

Shore post III with 2.5″ inner tube diameter and 3″ outer tube diameter.

Code No.	Adjustable Length	Inner Tube(OD)	Outer  Tube(OD)
PS00HIII	1.3-2.5m(4.3‘-8.2’）	2.5 Inch (63.5mm)	3 Inch(76.2mm)
PS01HIII	1.6-3.0m(5.2′-9.8′)	2.5 Inch(63.5mm)	3 Inch(76.2mm)
PS02HIII	198-3.35m(6.5′-11′)	2.5 Inch(63.5mm)	3 Inch(76.2mm)
PS03HIII	2.2-4.0m(7.2′-13.11′)	2.5 Inch (63.5mm)	3 Inch(76.2mm)
PS04HIII	3.0-5.0m(9.8′-16.4′)	2.5 Inch(63.5mm)	3 Inch (76.2mm)
PS05HIII	3.5-5.5m(11.5′-18′)	2.5 Inch(63.5mm)	3 Inch(76.2mm)

Post Shore Props IV

Shore posts IV has 3″ inner tube diameter and 3.5″ outer tube diameter.

Code No.	Adjustable Length	Inner Tube	Outer Tube（OD）
PS00HIV	1.15-1.85m	3 Inch(76.2mm)	3.5 Inch(89mm)
PS01HIV	1.75-3.05m	3 Inch(76.2mm)	3.5 Inch (89mm)
PS02HIV	2.0-3.5m	3 Inch(76.2mm)	3.5 Inch (89mm)
PS03HIV	2.4-4.0m	3 Inch(76.2mm)	3.5 Inch(89mm)
PS04HIV	3.3-5.0m	3 Inch(76.2mm)	3.5 Inch(89mm)

Among them, post shore I is the lightest, while post shore IV is the heaviest, with an ultimate load of more than 100 KN.

More Popular Types of Formwork Props

Middle Duty Adjustable Scaffolding Steel Props (3.2mm)

Code No.	Adjustable Height	Tube Size	Weight
WP250M	1.4-2.5m	OD48x3.2mm Inner Tube OD60x3.2mm Outer Tube	13.1KG
WP270M	1.6-2.7m		14.5KG
WP350M	2.0-3.5m		16.1KG
WP400M	2.2-4.0m		19.27KG
WP550M	3.0-5.50m		27.36KG

 Heavy Duty Acro Prop (4.0mm)

Code No.	Adjustable Height	Tube Size	Weight
WP300H	1.7-3.2m	OD48.3×4.0mm Inner Tube OD60.3×4.0mm Outer Tube	18.16KG
WP350H	2-3.5m		20.03KG
WP400H	2.5-4.0m		22.14KG
WP450H	3-4.5m		24.12KG

Formwork Props For Sale

Wellmade is a Leading Formwork Props Manufacturer and Exporter In China, with over 20 years of expertise in various industrial, civil, and commercial concrete shuttering applications, providing temporary scaffolding, concrete formwork slabs, and soffit shuttering support for walls, ceilings, formwork, and trenches.

Formwork Manufacturing Video

Wellmade’s Formwork Props are Tested According to the European Standard EN1065. Wellmade is a CE-certified formwork props factory, audited according to EN 1090 and ISO 3834 in Europe.

We Offer All Types of standard-size formwork Props for Your Construction, including acrow props, shoring props, and post shores. Wellmade also customises the adjustable shuttering props according to your construction design.

Our Formwork Props Are Compatible with All Your Concrete Formwork Systems and Various Formwork Brands, including Soffit Formworks, Ulma, Doka, Peri, and others.

You Can Get the Highest Quality Formwork Props From Wellmade At A Competitive Price.

In addition, Wellmade customises your acrow formwork prop according to adjustable height, inner & outer tube dimensions, top & bottom plate sizes, and shape. We design light-duty, medium-duty, and heavy-duty acrow props to meet your load requirements and save on budget costs, offering the safest and most cost-effective formwork props for your construction projects.   For example, we designed for clients.

• Formwork Props with Forkhead and U head
• Double and Single Braced Push and Pulls
• Bridge Leg Post
• Trench Struts

Wellmade’s formwork props can be finished in galvanised, painted or coated for anti-corrosion purposes.

Contact Us now.