A centrifugal-free manufacturing method for prestressed concrete pipe piles

Abstract

The invention discloses a centrifuging-free manufacturing method of a prestressed concrete pipe pile. Compared with the currently used centrifugal forming method, the manufacturing method has the advantages that one operation of inflating an air die is added and brings great affect on the manufacturing of the whole prestressed concrete pipe pile, the investment on plant construction is reduced, and the serious noise pollution of a centrifuging machine is also solved. The manufacturing method is free of residual slurry, so that the problem of pollution of slurry can be completely solved; the quality accident caused by insufficient concrete wall thickness can be avoided, thus the yield of the product is increased, and the production cost can be effectively reduced.

Description

[0001] Technical field: [0002] The invention relates to a centrifugal-free manufacturing method of a prestressed concrete pipe pile, which belongs to the field of industrial and civil buildings. [0003] Background technique: [0004] Prestressed concrete pipe pile (PHC) is an important pile foundation material. It is a hollow circular pile body. It adopts pretensioning method to apply prestressing process and adopts centrifugal forming process. The centrifugal forming process is divided into four stages: low speed, low and medium Fast, medium, high speed. That is, after the concrete is poured, the centrifugal method is used to increase the density of the concrete and form a hollow structure. The maximum centrifugal speed reaches nearly 1000 rpm. The noise of the centrifugal process is particularly large, and the noise pollution is particularly serious. [0005] After the concrete is centrifuged, the concrete layer also has serious delamination phenomenon. From the outside t...

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Problems solved by technology

That is to say, the centrifugation process only plays the role of forming the hollow structure of the concrete layer. Although the water-cement ratio of the concrete layer is reduced, it is not enough to offset the adverse effects on the strength of the concrete caused by the delamination of the aggregate and the loss of the slurry.

[0007] In addition, although the pipe pile concrete is poured according to the inner and outer diameter and length of the pipe pile, accidents often occur that the concrete wall thickness is insufficient after centrifugation. These pipe piles with insufficient wall thickness are substandard products and can only be downgraded for use.

[0008] Mold centrifugal forming has high requirements on centrifuge and tools. It is necessary to ensure that the mold and centrifuge run smoothly without any abnormal phenomena such as jumping and moving. Moreover, the noise of the centrifugal process is particularly loud, which is the most serious source of environmental pollution in pile-making factories. The energy consumption of the centrifugal process is high, the wear of the centrifuge and the mold running wheel is large, and the maintenance cost is also high

[0009] A large amount of residual slurry separated after concrete centrifugation is another source of pollution. 1 m3 of concrete discharges 0.05 m3 of residual slurry, weighing 90 kg. A medium-sized factory with an annual output of 2 million meters discharges 11,000 m3 of residual slurry a year, weighing 2 There are as many as 10,000 tons. Although they have tried their best to reuse them, the transfer of residual pulp will still cause a lot of pollution.

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