Process for forming vibration and extrusion process prestressed concrete pipe through core mold vibration method

Abstract

The invention provides a process for forming a vibration and extrusion process prestressed concrete pipe through a core mold vibrator. An inner mode and an outer mold which are completely installed are hoisted to be arranged on the core mold vibrator in a sleeved mode together so that a model and the core mold vibrator can be tightly attached to each other through locking devices. A feed hopper is arranged above the model, the core mold vibrator is started and conducts feeding while vibrating till the model is filled with concrete mixtures, and then other procedures are completed. According to the process, the vibration and extrusion process prestressed concrete pipe is formed by the core mold vibrator which is high in vibration intensity and good in vibration effect, quality of the prestressed concrete pipe can be improved, production cost can be reduced, the environment can be protected, and the waste residue discharge can be reduced.

Description

Technical field: [0001] The invention belongs to the production and molding process of prestressed concrete pipes, in particular to a process for forming one-stage prestressed concrete pipes by using a mandrel vibration method. Background technique: [0002] Prestressed concrete pipe has excellent crack resistance and bearing capacity, and can be used for high-covered soil pipes and simple foundations. The construction and installation of prestressed concrete pipe is convenient, fast, and the construction period is short. Local materials such as sand, stone, and cement are mainly used, so the price of the pipe is low. Concrete is corrosion-resistant and has a long service life of up to a hundred years, which is far better than metal pipes made of steel or cast iron. It has good earthquake resistance and can be laid and applied in strong earthquake areas. Therefore, it is widely used in urban water supply, water conservancy and water transportation, Agricultural irrigation, ...

AI Technical Summary

Problems solved by technology

[0014] 1. The plastic concrete mixture can only be molded by vibration. It is easy to flow and cover the pipe mold during the molding process, and the vibration molding time is greatly shortened.

However, the fluidity of the formed concrete is large, and the concrete passes through the steel wire from the tube core and enters the protective layer, which increases the expansion of the rubber sleeve and the model, and the tensor of the joint skin seam also increases

Cause the leather seam to run out of pulp, so that the prestressed steel wire here is easy to rust

[0015] 2. The expansion of the rubber sleeve and the outer mold increases, the ovality of the pipe increases, and the processing amount of the socket working surface increases, so it is difficult to guarantee the appearance and dimensional tolerance of the socket after grinding

[0016] 3. The increase of residual water content will increase the prestress loss after the vibration extrusion process of prestressed concrete pipe is completed

At the same time, the concrete creeps, which destroys the connection strength between the protective layer and the structural layer, and easily produces hollowing of the protective layer.

[0017] 4. The loss of prestress in the process of steam curing is large, and the amount of reinforcement needs to be increased by about 15%, which increases the cost of the product

[0018] 5. A large amount of water is added to the concrete. In order to ensure the strength of the concrete, the amount of cement needs to be increased, which increases the cost of the product accordingly.

[0019] 6. Vibrating plastic concrete is poured vertically on the vibrating table, which is easy to layer and segregate. There are few stones at the socket end, large amount of cement slurry, low concrete strength, and easy ring cracking at the socket

[0020] 7. Plastic concrete has high fluidity and is easy to run out of slurry, and the appearance quality of the resulting pipe is poor

[0023] 10. The concrete density is low, and it is fixed at the spigot end, which reduces the impermeability of the pipe body

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