What are the formwork support systems

1. Fastener type steel pipe support system

Disadvantages:

Unsafe: the vertical pole and the horizontal pole are connected by fasteners, and the vertical pole is connected by slotted fasteners, so the stability is poor.

Not environmentally friendly: the main keel is mostly 100 × 100 cubic meters of wood, with a large amount of wood input.

High obsolescence rate: it has been circulating in the market for many years, with serious corrosion, and the wall thickness is generally less than 3mm.

Low efficiency: Fasteners need to be disassembled during disassembly, and the erection and disassembly speed is slow

High loss: the connecting fastener is separated from the steel pipe, and the loss rate of fastener is high

Inflexible: the height of vertical pole is limited by the length of steel pipe in the market, and the height module combination is inflexible

2. Bowl button steel pipe support system

Advantages: the fuse bracket is designed with a toothed spoon buckle joint, which is not only quick and labor-saving, but also has simple structure, stable and reliable stress, avoids bolt operation, is not easy to lose scattered parts, and is safe, convenient and economical.

Disadvantages: the bowl buckle scaffold is an old tool scaffold, which has low technical requirements for workers, reducing the impact of human factors on the erection quality; However, due to the limitation of product modulus, its universality is poor, and its accessories are easy to be damaged and inconvenient to repair.

3. Portal steel pipe support system

Portal frame is widely used in southern China and decoration industry. The gantry scaffold is located in the standard shaped components, which is easy to set up and operate with high work efficiency. The cross-section size of the diagonal bar used is small and the economy is good. However, as a tool type risk problem, the finalized products also have the problem of ease of use, and because most of their upright poles are Φ 42.0 steel pipes, the market supply of special fasteners is insufficient.

4. Coiled steel pipe support system

Advantages of steel pipe support system

(1) The raw material of the pole is upgraded. The material is Q345, and the surface is hot-dip galvanized, with high bearing capacity;

(2) The joint connection is reliable. The vertical rod and the horizontal rod are connected by the axis, and the supporting diagonal rod is connected, which improves the stability of the frame against lateral force;

(3) The serialized and standardized design of the members can adapt to the assembly of various structures and spaces, and the collocation is flexible. Due to the connection of inclined rods, the cantilever structure and span space structure can still be erected;

(4) Compared with other support systems, the material can be saved by 1/3-1/2 under secondary load, and the product life can reach 15 years.

5. Allowable insert type keyway steel pipe support

Advantages of socket type concrete keyway steel pipe: designed according to the construction characteristics of high-rise reinforced concrete, it is a safe and reliable building formwork support system with simple operation, low cost, no vulnerable parts and good durability. It can speed up the formwork turnover, save investment, reduce labor cost and shorten the construction period.

6. Bench mold

Platform formwork, also known as flying formwork, is a large-scale tool type formwork for cast-in-place reinforced concrete floor slab. Generally, there is one bench model in one room. The platform formwork is a large-scale tool type formwork composed of platform plate, beam, support, support and adjusting outrigger, which can be demoulded and transferred as a whole, and can be transferred from the floor poured by the excavator to the upper floor for reuse with the help of a crane. It is applicable to the construction of cast-in-place concrete long slabs with large bays and large depths in high-rise buildings, and also applicable to the construction of cast-in-place beamless floors without column caps in cold storage, warehouse and other buildings. Because of its fast assembly and disassembly, labor-saving and low technical requirements, it has been popularized in many countries. The United States, Russia, Japan, France, Germany, Sweden and other countries have their own formwork system. It has also been used in high-rise building construction in China, but it has been rarely used in recent years. Applicable to beamless floor.

7. Ordinary independent steel support

The independent steel support is an independent steel support composed of a support column and a support head, which is characterized by:

(1) The steel plate surface of the support head is welded with two groups of spaced four limb angle steels; (2) The lower part of the support column is equipped with a folding tripod assembled by the support frame assembly head, the support, the left and right slips of the column and the locking device. The support frame assembly head is slightly shaped into a channel steel section. The web of the channel steel section is provided with a rectangular hole, and the web is welded with a main support. Pin holes are reserved on the upper and lower flange plates, and the internal support is connected with pins. The left and right slips of the column are sleeved on the pin shafts with different left and right supports, Slip is welded by upper and lower slips and slip top cover; The locking device handle welded with sector steel plate is connected to the main support with a pin.

(3) The inner pipe supporting the arch is sleeved with a return pin.

8. Aluminum alloy formwork

Aluminum template has been used for 50 years since it was born in the United States in early 1962. It is widely used in the buildings of developed countries such as the United States and Canada, as well as emerging industrial countries such as Mexico, Brazil, Malaysia, South Korea and India. Aluminum formwork has been favored by many builders after only a few years of development strategy in China.

9. Tower

It is mainly used for heavy-duty support of steel structure installation. It is characterized by high bearing capacity and convenient combination. Tower is the most widely used, mainly used for factory chimney support, large building support, water tower, monitoring engineering, communication engineering and other special purposes. Main structure and materials: three column steel pipe (flange connection) and four column angle steel (connecting plate).