Hướng dẫn thi công sàn nhẹ không dầm uboot beton

  1. Uboot light floor solution is a full block bi-directional light floor solution that uses Uboot hollow shaped plastic boxes to create hollow for the floor, these boxes are arranged parallel to each other to form I-beam sink systems interwoven in two directions. perpendicular direction.

    Uboot box concept

    Uboot is a hollow forming box made from recycled polypropylene, used in decking and rafting structures. Using Uboot box to create a hollow – flat floor – over a large span, saving materials and increasing the aesthetics of the building.

    Uboot box structure

    Uboot has a special structure with a box shape and 4 tapered legs. There are two types: single box and double box. In addition, between the boxes are linked together in 2 perpendicular directions by connecting rods.
    Uboot steel floor has a structure consisting of: A layer of steel below, and in the middle of the open spaces are reinforcing steel. Reinforcing steel is installed according to the design, depending on the characteristics of each project.
    The fact that the Uboot box into the concrete crate does not work reduces the weight of the floor, allows the floor to span large spans, and reduces the amount of concrete and steel used.
    Uboot floor is applied in flat floor without beams over span as well as with high load capacity. With its light weight, portability and versatility, designers can change specifications as needed in any case to match architectural requirements.


    1. Increase the number of floors: Due to the reduction of floor thickness compared to the traditional floor, with the same height, the building has the ability to increase the use floor.
    2. Large span and open architecture: By reducing the self-weight of the floor, it allows the floor to exceed large spans.
    3. Reduced Floor Thickness: The floor is thinner than traditional flooring with the same load and span length.
    4. Flat floor without beams: Architectural layout of the apartment is more flexible when using.
    5. Reduce the number of columns: Conveniently distribute the column space.
    6. Optimizing the column cross section: Reducing the load on the column should reduce the column cross section.
    7. Less weight on the foundation: Reducing the weight of the floor and columns means less load on the foundation.
    8. Reduce foundation size: Reduce excavation work.
    9. Reduced earthquake load: Reducing the mass participating in the oscillation leads to a decrease in the earthquake load.
    10. Improved sound insulation: Thanks to the increased stiffness of the upper and lower floors, as well as the hollow structure of the floor, it limits the transmission of sound through the floor.



    Applications in construction

    Using U-Bot (Uboot Beton) in the floor structure is very suitable for projects that require a lightweight, material-saving floor structure. U-Bot is the ideal solution for creating floors with large spans and high load capacity: especially suitable for structures with open space requirements, such as commercial centers, industrial houses, as well as buildings. public buildings and housing.
    U-Bot (Uboot Beton) makes column layout more convenient because beams are not required. In the case of construction sites that are difficult to transport and construct, the U-Bot, with its flexible, light and convenient features, is very convenient for construction conditions, without the need for complicated lifting and transporting equipment. When using U-Bot for rafting foundation, the foundation can have greater thickness while still reducing the amount of concrete used.

    Raft nail application

    Among the types of foundations, the raft foundation is the most widely used. The raft foundation is used on soft ground. When the load is large or the ground is weaker, the raft foundation needs to be designed with a large thickness, but it will increase the volume of concrete and thereby increase the construction cost.
    Thanks to the use of U-bot, the foundation structure will be lighter and with the same load-carrying capacity as the normal raft foundation but at a lower cost. After pouring concrete, U-Bot will structure the rafter foundation into 2 layers of upper and lower floors, linked by a system of perpendicular beams.
    On that principle, a reasonable mass distribution of the raft foundation using U-Bot helps the structure to have the highest stiffness and lightest at the same time, with the least amount of concrete and possibly without the use of a pile foundation for a period of time. number of cases.

    Uboot box construction method

    Transport and store Uboot boxes at the construction site

    • Uboot boxes are stacked, packed into pallets, each pallet is about 160 – 260 pieces. When handing over to the construction site, the construction unit is responsible for receiving the pallets and is responsible for checking and preserving at the construction site. In hot weather conditions, it is necessary to take measures to cover the box carefully to avoid thermal brittleness.
    • The transportation schedule of Uboot pallets (Time, order by quantity and type) needs to be consistent with the construction process in accordance with the construction schedule.

    When transporting Uboot pallets, the following requirements must be complied with:

    • Loading and unloading Uboot pallets on transport vehicles or stacking at the construction site must comply with the correct techniques and labor safety, avoiding collisions and breaking the box.
    • Do not drag Uboot pallets.
    • Uboot pallets need to be supported, rested on special wooden cushions, inserts and linings and must be placed in the correct wood and must be placed in the correct position.
    • When transporting, pull the Uboot pallets by silk cable. Do not let the structure topple over, move horizontally or hit the wall of the vehicle.
    • Attached busbars must have a slip specifying the detailed quantity.
    • Uboot pallets and connecting rods when storing and storing must be protected from the sun and rain to prevent the box from being cracked, brittle, or easily broken.
    • Ensure easy stacking and lifting of components when loading and unloading, without causing damage to adjacent pallets.
    • Do not stack pallets on the crane aisle and on the construction road.

    Requirement to check formwork, scaffolding before installing steel and Uboot

    • Scaffolding requires the use of a steel support system with jack legs and jacks, arranged to ensure bearing capacity (Depending on the thickness of the floor to arrange the scaffolding or the support system – make a method to construct the formwork to calculate the support system. ensure compliance with construction standards TCVN-4453)
    • The formwork should be covered with plywood, if using wooden or steel boards, it is required to cover the canvas to prevent water loss and ensure the self-flow of the concrete.
    • Formwork requires tight joints, leaving no holes or slots. If tape is used for sealing, the difference in elevation of the floor plane is not more than ±8mm.

    Installation of boxes, construction of Uboot floors at the site

    • Installation of the Uboot box needs to comply with the approved design drawings.
    • Because the structure of the Uboot box is plastic boxes, with a maximum load capacity of 100kg, during the construction of the Uboot floor, it is necessary to pay attention to the position standing on the surface of the box to avoid cracking the box.
    • The installation of the Ubot box is carried out immediately after the lower steel layer is installed and the alignment and cleaning is carried out. The construction and installation of the Ubot box follows the following sequence:
      • Determine the location to install the first Ubot box (Should choose the box in the corner of the house, or the corner of the floor tile). Stretch the string in two perpendicular directions of the box, arrange the boxes perpendicularly in two directions. The boxes are positioned together by connecting rods.
      • Spread the boxes in turn according to the pre-positioned Ubot rows.
      • Install the connecting rods according to the size between the 2 boxes according to the design, make sure the boxes are aligned, at the correct distance. Details are as follows:
    Wrong name Permissible level (mm)
    1. Distance difference between boxes:
    2. Box elevation deviation on a plane

    • For nails
    • For floor
    ± 20

    ± 20
    ± 10

    • After spreading the box, we can construct the upper steel and reinforcement steel. To avoid breaking the box during large steel construction, it is required to spread planks or steel formwork into walkways on the surface for workers to move around and manipulate. In case you must go to Ubox, make sure to step on the correct position specified above.

    Acceptance and installation of Ubot box

    • The boxes must be installed in a straight line, with enough anchor bars (connections) to prevent the box from cracking before installing the upper layer steel. If there is a cracked box, it must be replaced immediately.
    • Recheck the entire number of boxes, the distance to locate the Uboot connecting rod according to the design drawings and ensure that the required deviation is allowed as specified.
    • Continue to carry out the construction and installation of the upper large steel and the reinforcing steel.

    Note: The construction may cause the boxes to be displaced, so it is required that the constructor should limit standing on the surface of the box when the upper layer steel has not been installed. During the steel installation process, the connecting rods can be removed to facilitate movement, but they need to be reassembled immediately after the steel erection work is completed.

    Construction and acceptance of rebar

    The construction and acceptance test of reinforced concrete floor beams according to Vietnam’s current standard of reinforced concrete blocks of Vietnam.

    Ubot floor concreting work

    Install the wooden formwork system according to the traditional method (or similar system). Next, place the lower layer of reinforcement placed in two perpendicular directions like a lattice and position for the arrangement of the steel bars of the upper layer.
    Proceed to place the Ubot formwork boxes starting from the position of the first box according to the design drawings. The connecting rod between two adjacent boxes is positioned according to the beam width size of the design.
    Construction and installation of reinforcement steel, column cap steel, shear steel and upper layer steel according to design drawings.
    The concrete pouring process must be carried out in 2 stages to avoid the phenomenon of floating empty boxes: The first layer compared to the slump S5 will be filled with the base (through them no more than 2-3 cm). It is necessary to wait a while for the lower layer concrete to begin to harden and lose its fluidity.
    After a suitable waiting time, the concrete pouring process will continue as the first step, filling the boxes of Ubox formwork with concrete. Then level and finish in the traditional way.
    When the concrete has enough strength according to the standards, proceed to dismantle the formwork.

    Some things to note in the process of concreting Ubot floor

    • Do not bounce around the box during construction.
    • Strictly comply with the pouring specifications required by the engineer.
    • If there is a case of pushing the Ubot box, immediately stop using a sharp object to create a small hole on the surface of the Ubot sheet, the compressed air in the box will be released to equalize the pressure with the outside, then press the foot with the foot. Ubot box down to the original position.
    • Limit the use of static pumps to pour concrete. If necessary, prepare a sturdy pipe plank and strictly follow the instructions of the Field Engineer.
    • Concrete must meet the standards of slump (16 ± 2).
    • Do not add water to the concrete to make the concrete loose or thin.
    • Technical shutdown circuit: For large floor cells that do not pour all the concrete volume at once, the location of the construction stop circuit will be designated by the design consultant. At the location where the circuit stops construction, it must be prevented by a steel mesh with a mesh of 10x10mm. Before the next concreting, it is necessary to perforate all the concrete spilled over the mesh, spray clean the stopper circuit, then water the adhesive sika (Sika Latex or other equivalent) to the entire stop circuit. Watering Sika is guaranteed to comply with the requirements of the manufacturer of the type you use. Then proceed to pour the next batch of concrete.
    • When removing the formwork, make sure not to shake, shake the freshly poured floor.
    • The support tree is always guaranteed to support the next 2 floors. If it is required to remove the formwork, there must be a support point.

    Maintenance and dismantling of Ubot . floor formwork

    • The process of maintenance and dismantling of Ubot floor formwork is the same as that of ordinary reinforced concrete floors (According to TCVN 4453-1995).
    • It is recommended to use pineapple sacks or plastic sheets after pouring concrete, spreading on the cover surface and watering.
    • On the other hand, due to the use of concrete with a large slump, it is easy to crack on the concrete surface due to water loss, especially when the outdoor temperature is high. To overcome this phenomenon, when the concrete surface is almost hard (Technical staff can observe and check the reality at the scene), we let the workers go back to rub the face one more time or use a polishing machine. to re-rub the surface (suitable when floor area ≥1000m2)

    Floor quality requirements after dismantling formwork

    • The floor has a high level of flatness and smoothness.
    • The floor does not sag. If there is a hammock, it must be within the allowable range according to the ≤1/250 standard.
    • The surface above and below the floor has no cracks or cracks. If there is a crack, the crack or crack is ≤0.3mm.


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