The difference between pre-embedded parts and post-embedded parts

The difference between pre-embedded parts and post-embedded parts depends on the order in which the embedded parts are placed during concrete structure construction. < r>Usually, standard floor embedded parts are installed according to the architect's drawings before the curtain wall is subcontracted. If the bid is submitted early enough (before the concrete body is out of line), the curtain wall company can provide a drawing of the embedded parts and cooperate with the general contractor for construction.
The embedded parts are made by the original architect and owner before the structure is completed. The schematic design is carried out by civil engineering, because the schematic is drawn out in a hurry, and with subsequent modifications, the utilization rate of embedded parts is generally not high. The embedded parts are then determined by the owner and architect after the divisions are determined. The curtain wall designer then orders the rear-embedded steel plates, which are installed by the curtain wall construction team. The embedded parts are connected to the structure using anchor bars: the embedded parts are usually fixed with expansion bolts, and now chemical anchors are also used.
Normal The cost of embedded parts is very low, the processing cycle is short, the versatility is high, and it can be kept in stock
Embedded parts can be placed in advance in places with large stress, and embedded parts can be used in places with small stress. When subjected to horizontal shear force and Post-embedded parts can be used for parts that require on-site positioning during construction (such as large glass), and pre-embedded parts should be used as much as possible in other places.
The rear embedded parts cannot be connected to the main steel bars and have poor lightning protection, while the pre-embedded parts can be connected to the main body. Since the pre-embedded parts are buried before the in-situ concrete is cast, and are connected to the main steel bars by wire binding and electric welding, there is no doubt that they are strong and are very good in terms of lightning protection and grounding. And the cost is relatively low, about - yuan.
The most important problem with rear embedded parts is the issue of materials and construction management:
Now our general design is * stainless steel expansion + * chemical anchor bolts. Taking stainless steel expansion as an example, the quality is very different. big.
During the construction process, there will be problems such as chemical anchor bolts. If the dust is not completely cleaned, their bonding effect will be affected, and steel bars will be hit during drilling with electric hammers.
The cost is relatively high, about - yuan.
However, the embedded parts placed first will have a slight deviation due to the expansion of concrete and other factors, while the position of the embedded panels placed later can be better controlled.
The cost of pre-embedding is low, and it can be welded on the board without affecting the strength. The cost of embedding parts later is high, and if no measures are taken for welding on the board, the strength of the chemical anchor will be affected, because the chemical agent will The heat intensity is only one-tenth of the original, which is very dangerous.
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