scholarly journals Experiment and Numerical Study on Deformation Measurement of Cast-in-Place Concrete Large-Diameter Pipe Pile Using Optical Frequency Domain Reflectometer Technology

2018 ◽  
Vol 8 (9) ◽  
pp. 1450 ◽  
Author(s):  
Lei Gao ◽  
Yunhao Gong ◽  
Hanlong Liu ◽  
Baoquan Ji ◽  
Yining Xuan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Frequency Domain ◽  
Numerical Study ◽  
Large Diameter ◽  
Scale Model ◽  
Small Scale ◽  
Optical Frequency ◽  
Large Diameter Pipe ◽  
Diameter Pipe ◽  
Pcc Pile

The Cast-in-place concrete large-diameter pipe (PCC) pile has been used as the foundation reinforcement and embankment in China due to its low cost and high bearing capacity. The deformation of PCC pile under different vertical loads is very important for the application of engineering. In order to study the deformation characteristics of PCC pile, a small-scale model test was carried out. The new distributed measuring technology, named Optical Frequency Domain Reflectometer (OFDR), was applied to measure the strain on the PCC pile. A single mode fiber (SMF) was used, and the methods of layout, packaging and protection of optical fiber are introduced in detail. The obtained data was dealt with by wavelet transform, and the strain curves were analyzed based on the experiments. The finite element (FE) analysis model was established by COMSOL Multiphysics, and the numerical results compared with the experiment results. It showed that the optical fiber sensor can measure the strain of PCC pile, and that the deformation of PCC pile can be successfully obtained by OFDR technology. The strain of the pile decreases with depth and increases with loading. The measured result agrees well with numerical simulation result. The potential application of OFDR technology to PCC pile in situ and PCC energy pile is discussed.

First application of cast-in-place concrete large-diameter pipe (PCC) pile-reinforced railway foundation: a field study

2016 ◽  
Vol 53 (4) ◽  
pp. 708-716 ◽  
Author(s):  
Mi Zhou ◽  
Hanlong Liu ◽  
Yumin Chen ◽  
Yuxia Hu
Keyword(s):  
High Speed ◽  
Lateral Displacement ◽  
Soft Soil ◽  
Large Diameter ◽  
High Capacity ◽  
Design Guidelines ◽  
Excess Pore Pressure ◽  
Large Diameter Pipe ◽  
Diameter Pipe ◽  
Pcc Pile

Cast-in-place concrete large-diameter pipe (PCC) piles have been widely used in highway construction for foundation reinforcement, where soft ground was encountered, due to their fast on-site construction and high capacity, hence economics. This paper reports the performance of their first application in high-speed railway foundation reinforcement on soft soil ground. To satisfy the strict settlement requirement for railway design, PCC piles with large diameters (D = 1 m), thick pile wall thicknesses (t = 0.15 m), and close spacing (s = 2.5 m) were constructed. The foundation performance has been monitored by measuring in situ foundation settlement, excess pore pressure in soil, lateral displacement of soil, and tension in the geogrid during and after embankment construction. The measurements of this project have been compared with that of a previous project when PCC piles were used. It is found that the PCC pile arrangement in this project has performed as predicted and fulfilled the strict settlement requirement set by the Chinese design guidelines.

Stress Characteristics of Large Diameter Pipe Flange Connection With Non-Asbestos Gasket Under Elevated Temperature

2008 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Naoki Kawasaki ◽  
Yoshio Takagi ◽  
Hiroyasu Torii
Keyword(s):  
Thermal Effect ◽  
Material Properties ◽  
Large Scale ◽  
Large Diameter ◽  
Scale Model ◽  
Small Scale ◽  
Flange Connection ◽  
Nominal Diameter ◽  
Sealing Performance ◽  
Diameter Pipe

Since the flange rotation caused by internal pressure affects the sealing performance of pipe flange connections more by increasing the pipe nominal diameter, it is important to evaluate the sealing performance of larger nominal diameter pipe flange connection. However, most experiments were conducted with small-scale model due to the difficulty of large-scale experiment and numerical analyses containing uncertainties because of the lack of material models of gaskets. In addition, a sealing performance evaluation at high temperature is more difficult due to the thermal effect though the thermal condition is not avoidable in practical use. In this study, the 20” diameter pipe flange connection was used as a large nominal diameter pipe flange connection to analyze the stresses in the connection. In the FE analysis, the experimentally obtained material properties were used and the effect of diameter on the sealing performance was evaluated. The analysis revealed the thermal effect and the effect of flange rotation on the sealing performance. Moreover, the effect of material properties on the contact stress and hub stress of the pipe flange connections was evaluated. The experimentally obtained result was discussed with the FE result in this study.

Large Diameter Pipe Design under Urban Constraints

2003 ◽  
Author(s):  
Jennifer McNutt ◽  
Mike Middleton ◽  
Dave Bennett ◽  
Bruce Corwin ◽  
Brett Grant
Keyword(s):  
Large Diameter ◽  
Large Diameter Pipe ◽  
Diameter Pipe

Structure and properties of strip for large-diameter pipe made from steel in strength categories Kh80–Kh100

Metallurgist ◽  
2009 ◽  
Vol 53 (3-4) ◽  
pp. 136-145 ◽  
Author(s):  
Yu. D. Morozov ◽  
A. M. Korchagin ◽  
V. V. Orlov ◽  
A. A. Stepanov ◽  
E. I. Khlusova ◽  
...  
Keyword(s):  
Large Diameter ◽  
Structure And Properties ◽  
Large Diameter Pipe ◽  
Diameter Pipe

Large Diameter Pipe under Combined Loading

1973 ◽  
Vol 99 (3) ◽  
pp. 521-536
Author(s):  
Jack G. Bouwkamp ◽  
R. M. Stephen
Keyword(s):  
Large Diameter ◽  
Combined Loading ◽  
Large Diameter Pipe ◽  
Diameter Pipe

Simulation of the shaping of blanks for large-diameter pipe

2011 ◽  
Vol 41 (1) ◽  
pp. 61-66 ◽  
Author(s):  
V. N. Shinkin ◽  
A. P. Kolikov
Keyword(s):  
Large Diameter ◽  
Large Diameter Pipe ◽  
Diameter Pipe
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