Field Trials of Suction-Assisted Installation of Circular Steel Pipe Cofferdam in Silty Sand

2020 ◽  
Author(s):  
Jae-Hyun Kim ◽  
Zhenhua Xin ◽  
Ju-Hyung Lee
Keyword(s):  
Large Diameter ◽  
Test Site ◽  
Field Trials ◽  
Offshore Structures ◽  
Silty Sand ◽  
Steel Pipe ◽  
Sheet Pile ◽  
Construction Costs ◽  
Inner Diameter ◽  
Column Foundation

Abstract The cofferdam is the temporary barrier to stop the flow of water from a construction site work such as a support column foundation at a river or offshore. It allows for working in the dry condition when the construction is done adjacent or within the waters. However, it is a major cause of delays and increased construction costs because additional works are required to stop the water flow. Recently, in order to overcome the limitations of the conventional cofferdam methods such as sheet pile or caisson tube cofferdams, a large-diameter steel pipe cofferdam method has been proposed which can be installed quickly using suction installation method. The steel pipe cofferdam method is characterized in that the top-lid of the steel pipe is located above the sea level in order to use it as a water barrier, unlike conventional suction buckets where the whole structures are submerged. In this study, the circular steel pipe cofferdam with a 5 m inner diameter was fabricated and the installation tests were conducted on silty sand at the Saemaguem test site. During the experiment, variations of suction pressure and inclination of the steel pipe cofferdam were measured and post-analyzed. This study verified the new steel pipe cofferdam method and confirmed that the suction installation method can be successfully used for various purposes on the offshore structures.

Composite Reinforced Line Pipe (CRLP) for Onshore Gas Pipelines

2002 ◽  
Author(s):  
Tom Zimmerman ◽  
Gary Stephen ◽  
Alan Glover
Keyword(s):  
High Performance ◽  
Large Diameter ◽  
Research Work ◽  
High Strength ◽  
Field Trials ◽  
Gas Pipeline ◽  
Steel Pipe ◽  
Line Pipe ◽  
Analysis And Design ◽  
Natural Gas Pipeline

There has been a general trend in the natural gas pipeline transmission industry towards high-pressure pipelines using higher strength steels. However, as the strength has been increased, so have issues of weldability and fracture control. TransCanada PipeLines has been developing and testing a hybrid product since 1996 called Composite Reinforced Line Pipe (CRLP®) to address these issues. This is a patented technology developed by NCF Industries and licensed on a worldwide basis to TransCanada PipeLines. CRLP® is composed of high performance, composite material reinforcing a proven high-strength, low alloy steel pipe. The composite reinforces the steel pipe in the hoop direction, thereby increasing its pressure carrying capacity, while providing a tough, corrosion-resistant coating. This paper discusses recent research work concerning the use of CRLP® for large-diameter gas pipeline systems. Aspects discussed include analysis and design methodologies, full-scale testing, and field trials.

Grout field trials in outwash sands

2004 ◽  
Vol 41 (1) ◽  
pp. 1-11 ◽  
Author(s):  
R WI Brachman ◽  
C D Martin ◽  
S A Gilliss
Keyword(s):  
Sodium Silicate ◽  
Seismic Velocity ◽  
Large Diameter ◽  
Soil Improvement ◽  
Field Trials ◽  
Silty Sand ◽  
Strength Increase ◽  
Massive Structure ◽  
Temporary Support ◽  
Microfine Cement

Field trials were conducted to evaluate three different permeation grouts in a medium-dense, silty sand outwash deposit. Sodium silicate, microfine powder, and microfine cement based grouts were used. Visual observations from boreholes, a large-diameter shaft, and two inspection drifts through the grouted sand are reported. The sodium silicate grout produced a uniformly grouted material with massive structure. The microfine powder grout did not harden in the ground. The injection of the microfine cement grout resulted in only discrete veins of grouted soil. Laboratory testing of the grouted soil recovered from block samples quantified the strength increase of the sand grouted with sodium silicate. Cross-hole seismic velocity tests conducted through the grout zone prior to construction of the inspection shaft and drifts indicated increased velocities in the grouted soils. The successful trials established the suitability of the sodium silicate grout as a means of ground treatment for temporary support for tunnel excavation.Key words: permeation grouting, soil improvement, sodium silicate, microfine cement.

Pipeline Trenching in Permafrost: A Review

2002 ◽  
Author(s):  
Denis Blanchet ◽  
Nick Lenstra ◽  
John Skalski ◽  
Joe Zhou ◽  
Bruce Smith
Keyword(s):  
Tensile Strength ◽  
Oil And Gas ◽  
Large Diameter ◽  
Field Trials ◽  
Permafrost Soil ◽  
Case Histories ◽  
Construction Costs ◽  
Long Distance ◽  
Current Technology ◽  
Oil And Gas Pipelines

BP America Inc., Enbridge Pipelines Inc., and TransCanada PipeLines Limited recently sponsored a comprehensive technical review of the use of wheel and chain trenchers for excavating pipeline ditches for large diameter, long distance oil and gas pipelines in permafrost. The purpose of the review was to identify techniques that could be implemented to improve the productivity of trenchers in permafrost and reduce pipeline construction costs. This paper summarizes the key findings of the study. The study included an analysis of data obtained from previous field trials and construction case histories in permafrost, including the results from proprietary trials that have never been published. The study found that the primary subsurface conditions affecting the productivity of both wheel and chain trenchers in permafrost soil are: 1) the concentration and lithology of cobbles and boulders; 2) the presence and strength of bedrock within the depth of trenching; and 3) the tensile strength of the permafrost soil. With current technology, neither wheel nor chain trenchers can achieve satisfactory rates of production if more than 5 to 10 percent cobbles or boulders are present, or if hard bedrock exists within the depth of trenching. The study evaluated a number of techniques for improving the productivity of both wheel and chain trenchers in permafrost soil which may or may not contain hard inclusions. These methods included pre-blasting along the ditchline using either conventional blasting techniques or shaped charges. In addition, a wide variety of multi-pass trenching techniques were evaluated as part of the study.

scholarly journals Experimental Study on Deformation Behavior and Compressive Strength of Concrete Cast in Steel Tube Arches under Low-Temperature Conditions

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Tuo Shi ◽  
Nianchun Deng ◽  
Xiao Guo ◽  
Wen Xu ◽  
Shi Wang
Keyword(s):  
Compressive Strength ◽  
Low Temperature ◽  
Performance Test ◽  
Large Diameter ◽  
Test Site ◽  
Steel Tube ◽  
Design Strength ◽  
Curing Conditions ◽  
Expansive Agent ◽  
Arch Bridges

Taking the construction of a concrete-filled steel tube (CFST) arch bridge (part of the Sichuan-Tibet Railway) in low temperatures as the test site, firstly the deformation performance test of concrete was carried out. Following this initial testing, measurement of compressive strength and shrinkage performance was conducted in large-diameter CFSTs under a variety of curing conditions. Experimental results showed that the expansion effect of Ca-Mg composite expansive agent in concrete was better than that of other expansive agents at any stage. Under low-temperature curing (0°C), the sampling strength of the large-diameter CFSTs reached 73.5% of the design strength at 28 d in the presence of a nonthermal curing system. The design strength itself was reached, when a curing system involving a thermal insulation film was applied, and use of this film also led to improvements in concrete shrinkage. The results suggested that a Ca-Mg composite expansive agent, combined with an insulation film curing system, should be the technique selected for concrete pumping construction of CFST arch bridges in Tibet.

scholarly journals SHEET PILE CONSTRUCTION DESIGN AS AN ALTERNATIVE TREATMENT FOR LANDSLIDE ON THE CITY BOUNDARY’S ROADS SECTIONS OF TANAH GROGOT-LOLO KUARO, TANAH GROGOT DISTRICT, PASER REGENCY, TANA PASER

CERUCUK ◽  
2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Cindy Nitasari ◽  
Markawie Markawie
Keyword(s):  
Laboratory Data ◽  
Measurement Data ◽  
Secondary Data ◽  
Steel Pipe ◽  
Sheet Pile ◽  
The Road ◽  
Goods And Services ◽  
Construction Design ◽  
Road Users ◽  
The City

In Tanah Grogot district, precisely on the KM 6 road which is the city boundary roads of Tanah Grogot City-Lolo Kuaro it has an important role as the only access for road users. Because at the side of the roads does not have a drainage channel, resulting in water overflowing and the seepage flowed on the surface, causing a landslide. The length of the landslides is 50 meters, with a width of 5.5 meters and the highest height is 9.6 meters. The result of this landslide is very disturbing for the road users. The delivery of goods and services can not be accommodated properly. Therefore, it is expected that this path must be handled properly, so the road can be functioning again safely and comfortably. How to handle this problem is by making a design of retaining walls construction which is safe in form of sheet pile.The planning for this anchored sheet pile begins with analyzing the secondary data in form of data sondir, laboratory data, and topographic measurement data. This then followed by the calculation of the forces acting on the sheet pile, the calculation of moments in the sheet pile, the calculation of the carrying capacity of the pile on the anchor, capacity calculations for the mast against a lateral load, and the slope stability analysis using GeoStudio2007 application. After that designing the sheet pile construction, tierod, the pile, planning the budget, and makes the Detail Engineering Design (DED).From the planning, the profile of concrete sheet pile obtained is CCSP W-500-A-1000 with a total length of the sheet pile is 12.2 meters. On tierod using dimensions of 6.32 m long with a diameter of 5 cm. On the pile is using a steel pipe with a diameter of 40 cm which penetrated into 10 m depth. For the stability of the slope with the reinforcement of piles obtained SF = 5.5> 1.25, which can be said as safe.Keywords:  designing sheet pile, anchored sheet pile, steel pipe piles.

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