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Vanke City Aluminium Concrete Formwork Hire Solution
● Project Overview
This project is Phase A of Vanke City, located south of Hongshan West Road and west of Xinxin Road in Kaifu District, Changsha City. The total construction area of this project is 85,393.34 square meters (with Building 22 covering an area of 25,582.22 square meters). It consists of 22, 23, and 24 high-rise residential buildings, as well as 26, 27, 28, and 29 multi-story residential buildings and Basement. The high-rise residential buildings 22, 23, and 24 have a relative elevation of ±0.000, with an absolute elevation of 32.7 meters and an indoor-outdoor height difference of 0.30 meters. The multi-story residential buildings 26, 27, 28, and 29 also have a relative elevation of ±0.000, with absolute elevations of 33.5 meters, 33.4 meters, 33.4 meters, and 33.3 meters respectively. The high-rise residential building 22 has a height of 97.85 meters, while buildings 23 and 24 have a height of 103.5 meters each. They belong to the category of high-rise buildings and are designed to withstand earthquakes of intensity level 6. They have a fire-resistance rating of level 1 and a roof water resistance rating of level 2. Considering the construction quality, project duration, and economic benefits, especially the improvement of the measured and perceived quality of the concrete structure in this project, the project team has decided to adopt a concrete formwork hire solution for all floors above the standard level of building 22. This will effectively reduce construction costs.
| Engineering Design Overview Sheet | |||||
|---|---|---|---|---|---|
| Num | Project | Information | |||
| 1 | Floorspace(M2) | Total Floorspace | 85393.34 | 4# basement area | 8586.63 |
| Gloor space | 8586.63 | Standard floor area | 841.73/397.96 | ||
| 2 | Number of floors | Ground | 3 | Underground | 1 |
| 3 | Floor height | Ground floor | 3.9 | Basement floor | 5.5 |
| 2-33 floors | 2.8 | 34 floors | 2.75 | ||
| 4 | Structure type | Basement structure | frame shear structure | ||
| Main structure | Shear Wall Structure | ||||
| 5 | Underground waterproof | Concrete self-waterproofing | self-waterproof concrete | ||
| Flexible waterproof | Cement-based seepage crystallized waterproof coating, polyurethane waterproof coating | ||||
| 6 | Structural section size | Exterior wall thickness(MM) | 200 | ||
| Interior wall thickness(MM) | 200 | ||||
| Column section size(MM) | |||||
| Beam section size(MM) | 200*400,200*300,200*500 | ||||
| Slab thickness(MM) | 130,100,120 | ||||
| 7 | Stair structure form | beam, slab staircase | |||
| 8 | Ramp structure form | shear wall | |||
Whether you choose to buy used concrete formwork or new aluminium concrete formwork, the costs are high and not cost-effective for this project. Therefore, concrete formwork hire becomes a more economical option. Concrete formwork hire is a well-established service that is widely used in different countries globally, such as concrete formwork hire nz, concrete formwork hire perth, concrete formwork hire adelaide, concrete formwork hire melbourne, concrete formwork hire uk, and others. By opting for concrete formwork rental, you can meet project requirements while keeping costs affordable.
1. Concrete formwork hire can help save costs in construction. For some smaller projects, the expense of buying aluminium concrete formwork could make up a large proportion of the entire project budget. However, by opting for aluminium concrete formwork rental, this cost can be reduced, allowing more resources to be allocated to other areas of the project and improving overall economic efficiency.
2. AluminIum concrete formwork hire can enhance construction efficiency. The use of aluminium concrete formwork helps to shorten the construction period and improve work efficiency. By opting for aluminium concrete formwork hire, you can quickly obtain the required number of formwork, thus avoiding any time wasted due to a shortage of formwork during the construction process.
3. Aluminium concrete formwork hire also provides corresponding technical support and services to help optimize construction and improve work efficiency.
4. Aluminium concrete formwork hire can also reduce construction risks. Concrete formwork suppliers will maintain and upkeep the hired concrete formwork, ensuring quality and safety. If purchasing the concrete formwork, one would be responsible for maintenance and upkeep, which could potentially impact work progress and pose threats to workers' safety in case of any quality issues.
Therefore, by opting for aluminium concrete formwork for hire, construction projects can reduce associated risks and ensure safe and smooth operations. Aluminium concrete formwork for hire is a cost-effective choice that can save construction costs, improve work efficiency, and mitigate risks. When selecting suppliers, it is important to choose reputable concrete formwork suppliers.
| Num | Project | concrete formwork aluminium | concrete formwork steel | concrete formwork timber |
|---|---|---|---|---|
| 1 | concrete formwork materials | 4.0mm aluminium plate | 5-6mm steel plate | 18mm coated plywood |
| 2 | weight | 25-27 | 80-85 | 10.5 |
| 3 | concrete pressure on formwork（kn/m2 | >30 | 60 | 30 |
| 4 | Turnover times | 300 | 250 | 8 |
| 5 | construction difficulty | Easy | Difficult | Easy |
| 6 | Maintenance costs | Low | High | Low |
| 7 | concrete formwork installation rates | High | Higher | Low |
| 8 | formwork use in concrete | Walls, columns, beams, slabs, bridges | Walls | Walls, columns, beams, slabs, bridges |
| 9 | concrete surface quality | Smooth and clean to meet finish and decoration requirements | Smooth and level to meet the requirements of a plain water finish. | rough surface |
| 10 | recycling value | High | Middle | Low |
| 11 | Dependence on lifting machinery | Not dependent | Dependent | Not dependent |
● Construction arrangements
Labor force arrangement should be based on the construction schedule plan and the division of labor for each construction phase. Please refer to the table below for the main labor force distribution and quantity.
| Num | Occupations | Structural work | ||
|---|---|---|---|---|
| Wall | Beam | General workers | ||
| 1 | concrete formwork carpenter | 26 | 26 | 20 |
| 2 | Electrician | 2 | ||
| 3 | Welde | 2 |
● Aluminium concrete formwork tools preparation
| Aluminium concrete formwork tools preparation | |||
|---|---|---|---|
| Name | Specification | Power | Quantity |
| hammer | Weight:0.25-0.5kg | 60 | |
| single head wrench） | Opening width（ mm ) :17―19、22―24 | ||
| Electric hand drill | Drill diameter:12～20mm | 8 | |
| hammer drill | GBH2-22E | 12 | |
| Portable cutting machine | 1.05kw | 6 | |
| adjustable wrench | Maximum opening width:65mm | 14 | |
| welder | GOODWELD-400 | 400W | 1 |
| arc welder | 1 | ||
| 9105 aluminium sawing machine | Diameter:225mm | 1 | |
| Leveling instrument | DSG280 | 2 | |
| Laser vertical instrument | DZJ-3 | 2 | |
| level ruler | Length 450、500、550mm | 1 | |
| Steel tape | 2m and 20、50m | ||
| straightedge | 2-3m | ||
● Aluminium concrete formwork construction requirements
★ Preparation work
1. Before the arrival of aluminium concrete formwork, the project department should organize relevant technical personnel to provide guidance on aluminium concrete formwork tips and familiarize themselves with advanced concrete technologies.
2. After the arrival of aluminium concrete formwork, it is necessary to check whether the numbers, specifications, quantities, and specifications of accessories on the packing list match. Additionally, a prominent marking should be made on the back of the concrete formwork using a pen for easy identification and lifting purposes.
3. Concrete formwork brackets, Concrete formwork turnbuckles, Concrete formwork spacers, Concrete formwork bolts, Concrete formwork tie rods, and other items should be stored in the warehouse to prevent rusting.
4. Prepare auxiliary materials such as concrete formwork oil and concrete formwork tubes.
5. Prepare construction tools such as hammers, pry bars, electric drills, wrenches, cutting machines, electric hammers, plumb bobs, crowbars, pulleys and ropes, and ladder stools.
★ Process Flow:
Measure and layout → Install steel reinforcement for walls and columns (electrical conduiting work for walls and columns) → Install aluminium concrete formwork round column and concrete formwork wall → Install aluminium concrete formwork beam → Install aluminium formwork materials for concrete slab → Install steel reinforcement for beams and slabs (electrical conduiting installation for beams and slabs) → Final reinforcement and inspection → pouring concrete in formwork → Transfer aluminium concrete formwork to the next unit.
(1) Measure and mark the control lines for walls and columns. The control line for walls and columns should be 300mm away from the wall edge, allowing for checking whether the concrete formwork is positioned correctly and aligned.
(2) Install steel reinforcement for walls and columns, along with embedded electrical and plumbing boxes, conduit, and reserved openings. Once completed, proceed with the procedures for concealed work inspection and acceptance.
★Aluminium concrete column formwork materials installation
1）Check the elevation of aluminium concrete column formwork materials against the benchmark control points to ensure compliance. To keep it within a tolerance of 5mm.
2）Weld positioning reinforcement onto the longitudinal bars at the base of the walls and columns to prevent displacement during the reinforcement process of aluminium concrete column formwork materials. Install cement internal braces or steel internal braces, matching the thickness of the walls and columns, to ensure the dimensional integrity of the sections.
3） Before assembling the aluminium concrete column formwork materials, it is necessary to thoroughly clean the surface and apply a thin and even coat of concrete formwork release oil. The application of concrete formwork release oil should be precise, without any missed spots. During the application, it is important to be mindful of the surrounding environment to prevent spillage on buildings, equipment, and personal clothing.
4） Assemble the aluminium concrete column formwork materials in accordance with the designated trial assembly drawings. Before sealing the aluminium concrete column formwork materials, PVC pipes should be pre-fitted onto the concrete formwork tie rods. It is crucial to ensure accurate positioning of the sleeves in contact with the aluminium concrete column formwork materials for easy retrieval after pouring.
5） For convenient dismantling, the wedges on the connecting pins of the aluminium concrete column formwork materials should be inserted from top to bottom to prevent detachment during concrete pouring.
6 ）To prevent leakage of grout from the aluminium concrete column formwork materials, a day before the concrete pouring, seal it using cement mortar. It is strictly prohibited to use cement bags to seal the bottom of the board to avoid the occurrence of the "rotten root" phenomenon.
★ Aluminium concrete formwork beams Installation
Assemble the aluminium concrete formwork beams in the designated order according to the trial assembly drawing. Adjust the height of the beam bottom using supporting rods, ensuring that the supporting rods are vertical and without looseness. The connection between concrete formwork beams should also be done using concrete formwork tie rods.
★ Aluminium formwork materials for concrete slabs Installation
Begin assembling the aluminium formwork materials for concrete slabs from the corners based on the designated trial assembly drawing. The supporting rods should be vertical and firmly secured, without any looseness.
★ Aluminium concrete formwork Reinforcement
After the assembly is complete, reinforce the Aluminium concrete formwork by installing concrete formwork walers and concrete formwork tie rods. During installation, two people should work simultaneously on both sides of the wall or column. It is crucial to apply appropriate force without being too tight or too loose, as it can affect the accuracy of the measured data.
● Aluminium concrete formwork removal time
The time for removing the Aluminium concrete formwork varies depending on the position of the components and the span. It can be removed once the concrete has reached the design strength after pouring. So, when can concrete formwork be removed?
1. Concrete formwork wall removal time: The concrete formwork wall can be removed once the concrete strength reaches 1.2 MPa, which typically occurs after 12 hours of pouring. To begin the removal process, first dismantle the push-pull props, concrete formwork wall ties, and concrete formwork pins. Then, use a pry bar to separate the concrete formwork wall from the wall structure.
2. Concrete slab formwork removal time: The concrete slab formwork can be removed once the concrete has reached 50% of the design strength after pouring. Typically, it can be removed after 24 hours. During the removal process, it is important to ensure that the concrete formwork supports remain unchanged and secure without any looseness.
3. Concrete formwork beam removal time: The concrete slab formwork can be removed once the concrete has reached 50% of the design strength after pouring. Typically, it can be removed after 24 hours. During the removal process, it is important to ensure that the concrete formwork supports remain unchanged and secure without any looseness.
4. concrete formwork supports removal time: The concrete formwork supports can be removed in accordance with the concrete strength requirements. Typically, they can be removed after 21 days. During the removal process, use one hand to hold the concrete formwork supports and another hand to tap the adjustable pivot with a hammer to loosen it.
| Component Name | span（m） | strength of concrete(%) |
|---|---|---|
| slab formwork | ≤2 | ≥50 |
| >2,≤8 | ≥75 | |
| >8 | ≥100 | |
| beam | ≤8 | ≥75 |
| >8 | ≥100 | |
| Cantilever | - | ≥100 |
● Quality assurance measures
1. Enhanced technical training: Construction technical personnel provide concrete formwork courses training to on-site workers, ensuring that they understand the processes and quality requirements.
2. Implementation of full-process supervision: Construction technical personnel and quality inspectors conduct on-site full-process supervision and guidance, promptly identifying and rectifying issues to ensure that the technical aspects and quality meet the requirements.
3. Factory acceptance: Arrange for technical personnel to conduct acceptance of concrete formwork fabrication and engineering at the factory, addressing potential issues that may arise during the on-site assembly and avoiding any impact on the project schedule.
4. Stringent quality inspection requirements: After the completion of concrete formwork works, conduct individual inspections and acceptance under the supervision of the construction supervisor, while maintaining detailed records. Quality inspections must be conducted in accordance with the current construction regulations.
5. Strengthened management system: Heavier penalties will be imposed on teams that engage in violations, and fines will be levied for serious issues such as misalignment of the formwork or insufficient grouting, with strict enforcement of management systems.
6. Implement actual measurement: According to concrete formwork inspection checklist to track and measure the actual dimensions. After installation is complete, conduct actual measurements of flatness, verticality, and squareness, record the data, and make adjustments to any non-compliant formworks until they meet the requirements.
In summary, to ensure the quality of concrete formwork fabrication and engineering, professional construction supervisors should strengthen management efforts. This includes focusing on aspects such as the construction team, materials, technical solutions, and quality inspections. By implementing strict controls and comprehensive supervision throughout the entire process, we aim to achieve high-quality results that are both cost-effective and efficient.
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