Application of prestressed concrete pipes to deep pipelines

2014 ◽  
pp. 267-274
Author(s):  
R Wróblewski ◽  
A Kmita
Keyword(s):  
Prestressed Concrete ◽  
Concrete Pipes

Continuous Thickness Control of Centrifugally Cast Concrete Pipes by an Ultrasonic Echo-System

1968 ◽  
Vol 1 (2) ◽  
pp. 50-52
Author(s):  
J. A. de Raad ◽  
A. de Sterke
Keyword(s):  
Prestressed Concrete ◽  
Large Diameter ◽  
Ultrasonic Pulse ◽  
Centrifugally Cast ◽  
Concrete Pipes ◽  
Ultrasonic Echo ◽  
Cast Concrete ◽  
Large Diameter Pipes ◽  
Pulse Echo ◽  
Made In

Large diameter pipes of prestressed concrete with a length of 10–20 ft. used for water transport are made in rotating moulds. To control the thickness of these concrete pipes during production, an ultrasonic pulse-echo system mounted at the end of the feeder is used. Basically, the air gap between feeder and inner pipe wall is continuously measured, whereby deviations due to misalignment of the feeder are electronically compensated. A prototype version of the system has proved its usefulness. An accuracy of ±5% of the nominal wall thickness was obtained.

Analysis on Excess Pore Water Pressure Caused by Prestressed Concrete Pipes Construction in Saturated Clay Ground

2010 ◽  
Vol 168-170 ◽  
pp. 1238-1244
Author(s):  
Gui Hai Fu ◽  
Li Min Wei ◽  
Hui Zhou
Keyword(s):  
Pore Water ◽  
Prestressed Concrete ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Soil ◽  
Excess Pore Water Pressure ◽  
Concrete Pipes ◽  
Saturated Clay ◽  
Clay Ground ◽  
Excess Pore

Prestressed concrete pipes construction by hammer cause high excess pore water pressure in deep soft soils because Soil disturbance by violent and poor permeability of soft soil. Taking the typical soft ground in passenger special line from Hang Zhou to Ning Bo as the engineering example, the in-situ measuring of the excess pore water pressure in saturated clay ground during the construction of the piles was carried out, and the comparison analysis with the solutions from Vesic theory was also done. The changing rules of excess pore water pressure and its influence range during the sinking of the piles were studied, which would provide an important basis for the design and construction of the similar projects.

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