by The wide application of aluminum mold construction technology, new materials and new processes in cast structures is the driving force for the rapid development of the construction industry.
It can not only improve quality, increase safety and reliability, but also improve construction efficiency and reduce project costs.
In this regard, our company has also gradually promoted according to the actual situation of the company’s development and in combination with the construction site plan and step by step, such as aluminum alloy formwork, precast buildings, high-performance concrete technology, BIM pipeline integrated technology, thermal insulation integrated technology, etc.
During the construction, we constantly explored and studied deeply, solved the problems in actual operation, and accumulated some experience.
The application of new technologies is often not unique, such as the combination of aluminum alloy formwork and high-performance concrete, and the integration of thermal insulation using aluminum alloy formwork for reinforcement.
They interact and restrict each other.
Only by fully understanding the performance of new materials, mastering the core of new technologies, and knowing the process of new processes, can their advantages be fully exerted to ensure that the construction can achieve the desired purpose.
Shijiazhuang Tiantong Project encountered such a problem at the early stage of construction.
There are four 27 storey precast residential buildings in this project.
In the early planning, it is considered that it is economical to use aluminum alloy formwork for 27 storey residential buildings.
However, we have not encountered aluminum alloy formwork for precast components in previous construction.
What technical difficulties are involved in the combination of the two, such as whether the existing support system of aluminum formwork can bear the load of PC components, How to ensure the stability of the frame, and how to deal with the slurry leakage at the junction of the laminated plate and aluminum film.
In response to these problems, the project department held a special meeting to analyze the problems, analyze the nodes, and then put forward countermeasures.
The aluminum mold and assembly type manufacturers were gathered together to optimize each node in each part, and the problems were improved during the construction process, so that the aluminum mold and assembly type buildings can be perfectly combined.
Here is a brief introduction to the composite aluminum mold support system of Tiantong Project, For your reference and study.
1.
Aluminum mold design: the design of aluminum mold shall be deepened according to the plan of the laminated plate.
The size, thickness, weight of the laminated plate and the position, width, etc.
of the plate abutting joint shall be considered.
The spacing of the vertical poles shall meet the requirements of the bearing capacity, generally about 1 m is appropriate; The internal corners of shear walls and beams are supported by angle formwork (slot C).
The aluminum formwork beam and support head are configured according to the standard to increase the overall stability of the aluminum formwork.
The top plate fittings are installed at the splicing position of the laminated plate.
It is required that the size of the laminated plate lapped on the aluminum formwork is not less than 100mm; Deepening plan of aluminum mold of Tiantong Project 2.
Aluminum mold installation: first install the wallboard, starting from the end sealing plate, and install the wallboard one by one on both sides at the same time.
After the completion of wall mold assembly, use the round pipe diagonal support to reinforce to prevent displacement, and use infrared ray to correct the perpendicularity and flatness of the wallboard; After the vertical correction of the wall body is completed, install the beam bottom plate and the formworks on both sides, and correct the elevation of the beam bottom accurately.
Install the angle formwork and fix it with pins, and adjust the elevation of the top of the angle formwork (the elevation of the bottom of the laminated plate); Install floor beam, support head and support column; Finally, install the top plate formwork according to the joint position of the laminated plate; The elevation deviation of aluminum formwork top can be corrected through the adjustable support of the formwork system until the overall flatness is achieved; Aluminum formwork assembly 3.
Overall correction: after the levelness and elevation of each unit are adjusted, the levelness and elevation of the whole floor shall be checked once, to check whether the pull pieces of the wall body are missing, whether the pins are tightened and locked, and whether the gap between the bottom of the inner wall panel and the top plate is too large.
When the gap exceeds 3mm, cement mortar shall be used to fill it, to prevent concrete leakage and wall corner heel confusion during pouring.
After the floor panel and beam plate are cleaned, release agent shall be applied; Aluminum mold correction 4.
Connection between aluminum mold and composite plate: the contact surface between the composite plate and aluminum mold is sealed with adhesive tape to prevent hard connection and concrete leakage.
It is required to paste adhesive tape or thick sponge tape at the root of slot C and the joint of the composite plate; Aluminum mold and laminated plate 5.
Installation of laminated plate: lift the component off the ground, observe whether the component is basically horizontal, whether each hook is stressed, and lift the component after it is basically horizontal and all hooks are stressed; The composite plates shall be placed according to the position of the components shown in the drawing and the direction of the arrow.
The composite plates shall be lifted and placed with care.
The edge of the component plates shall be 10mm deep into the beam and shear wall.
The allowable deviation of the flatness of the surface of the composite plates is 5mm.
When the gap between the composite plates and the aluminum mold contact surface is large, the foam adhesive can be used for plugging to prevent mortar leakage; Installation of composite plate is completed 6.
Concrete pouring: When the composite plate, aluminum mold, steel bar, water and electricity are embedded and accepted, concrete can be poured.
During concrete pouring, pay attention to compact vibration to prevent missing vibration and excessive vibration.
At the same time, strengthen the surface finishing and curing of concrete to prevent cracking of the roof.
The above concrete pouring is the case of the aluminum mold and cast composite plate construction of Shijiazhuang Tiantong Project.
The aluminum mold and PC components such as beams and walls can also match each other, which requires us to make full planning before construction to eliminate the problems that are easy to occur in advance.
For example, when the aluminum mold is installed on the shear wall component, the location of the split screw hole on the PC component needs to be considered; When the beam PC member is used, the C-slot and the beam member shall be fixed with high-strength screws to prevent the C-slot disturbance from causing the displacement of the composite plate.
In addition, we also need to be familiar with the drawings in detail, so that the aluminum mold design and assembly manufacturers can be optimized to achieve the best, so as to ensure the accurate size and perfect molding of the building structure, so as to improve quality, ensure efficiency and reduce costs.
Source: Rongsheng Construction welcomes your attention..
