• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.244-247
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• 2002

The pile foundations have been chosen more frequently as the comprehensive development of the country progressed, especially where the ground conditions are not suitable for the construction and the dimension and the length of the piles utilized becomes larger and longer. The purpose of this study suggests the improvement method of construction management for PHC pile in an apartment house. To do This, We analyzed about current process and provided improved Process with IDEF method. And, The objectives of this research is to propose the means to solve the current problems and management factors from the results of the investigation.

• Proceedings of the Korea Concrete Institute Conference
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• 1994.10a
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• pp.405-414
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• 1994

The High Strength Concrete REsearch Team of the Dong-Ah Construction R&D Institute has achieved the preactical use of the PHC pile manufacture technique at the Dong-Ah Chang-dong PC Plant. Components of the high strength concrete are used high strength cement, admixtures(water reducing high range admixture, micro silion fume, fly ash, gypsum). The design strength required 800kg/$\textrm{cm}^2$ was developed raging from 870kg/$\textrm{cm}^2$ to 1010kg/$\textrm{cm}^2$. The new manufacture procedure of HPC pile which include placing, molding, steam curing is able to apply a current PC pile manufacture procedure easily without using the high pressure steam curing.

• Journal of Korean Association for Spatial Structures
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• v.15 no.3
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• pp.85-93
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• 2015

This paper presents a foundation pile to steel column connection that can resist large magnitude of moment and that can be easy installed. The developed joint has spherical shape and it is given the name HAT joint to mean Hallow half-sphere steel joint. Four types of HAT joints are developed. Namely, H-type, T-type, P-type and K-type. In this paper I will talk about the performance assessment of T-type(Tube Column) and P-type(Pile Column) of HAT joints with finite element analysis and experiment on a full scale model is presented.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.881-884
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• 2008

Nowadays, large amount of waste pottery annually are produced. It is needed that waste pottery is to are used as recycle materials in order to prevent environmental pollution and economic profits. Therefore, the purpose of this study is to present the method of utilizing the cement admixture that is obtained from waste pottery as the cement admixture. The test results that the replacement of waste pottery powder by cement admixture at the level 5%, 7% had effect on the compressive strength of the PHC pile. As a conclusion, improved strength recycled(waste pottery powder) PHC pile can be produced of cement admixture.

• Journal of the Korean GEO-environmental Society
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• v.9 no.1
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• pp.41-46
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• 2008

In this study, the analysis of load transition of PHC pile was performed with the static load test, which was driven in deep soft clay layer of MyungJi site in the western area of Pusan. The results of test showed that the range of unit side resistance of pile in sand layer were $7.4t/m^2$ to $23.3t/m^2$ and $6.4t/m^2$ in the soft clay layer, while the unit base resistance was $955t/m^2$ in dense silty sand layer. To select the most reasonable static bearing capacity formular, the field measured values are compared with the calculated ones from the suggested various formular. In the case of side resistance in sand layer, the suggest formular in the Structural Foundation Design Manual by KGS was most reasonable, while in clay layer Railroad Design Manual.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.29-30
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• 2009

In this study, analyzing loads transferred to the piles, both easily constructed and mechanically improved pile head design method for the PHC pile is presented. To compare with mechanical capacity of the existing and proposed method, tensile, compression, moment, and shear tests are performed with 11 pieces of full-scaled blocks. As a result, mechanical capacities of the proposed method is superior to those of existing one in all aspects and work efficiency as well.

• Journal of the Korean Geotechnical Society
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• v.40 no.1
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• pp.5-14
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• 2024

PHC piles demonstrate superior resistance to compression and bending moments, and their factory-based production enhances quality assurance and management processes. Despite these advantages that have resulted in widespread use in civil engineering and construction projects, the design process frequently relies on empirical formulas or N-values to estimate the soil-pile friction, which is crucial for bearing capacity, and this reliance underscores a significant lack of experimental validation. In addition, environmental factors, e.g., the pH levels in groundwater and the effects of seawater, are commonly not considered. Thus, this study investigates the influence of vibrating machine foundations on PHC pile models in consideration of the effects of varying pH conditions. Concrete model piles were subjected to a one-month conditioning period in different pH environments (acidic, neutral, and alkaline) and under the influence of seawater. Subsequent repeated direct shear tests were performed on the pile-soil interface, and the disturbed state concept was employed to derive parameters that effectively quantify the dynamic behavior of this interface. The results revealed a descending order of shear stress in neutral, acidic, and alkaline conditions, with the pH-influenced samples exhibiting a more pronounced reduction in shear stress than those affected by seawater.

• Journal of the Korean Geotechnical Society
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• v.33 no.6
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• pp.17-25
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• 2017

In this research, post grouting methods were applied on PHC piles, and static load tests were conducted to confirm the effect of post grouting on bearing capacity enhancement of PHC piles. Grouting pressures of 1.9 MPa and 3.5 MPa were applied, and bearing capacities of grouted piles were compared with that of non-grouted pile. From the static load test results, the bearing capacities of grouted piles were about 3 times higher than that of non-grouted pile. In addition, the design efficiency (allowable bearing capacity/nominal bearing capacity) increased from 32% to 97% after post grouting, and the axial stiffness of piles also increased by about 1.3 times per grouting pressure.

• Journal of the Korea Convergence Society
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• v.6 no.6
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• pp.163-169
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• 2015

This study was intended to suggest a new-concept construction method of permanent basement wall combined with earth retaining wall by using PHC piles to overcome the disadvantages of conventional CIP methods or the like which have been used just for earth retaining walls during field construction, and to determine its applicability. PHC piles are characterized by the reliable quality attributed to prefabrication (shop fabrication) as well as superior concrete strength and prestressing steel strength to that of CIP in the aspect of materials, and also higher bending moment than that of CIP in the aspect of structure.

• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.319-320
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• 2010

This Study aimed to investigate fundamental properties of PHC pile using waste TFT-LCD glass powder. Through the present study, waste TFT-LCD glass powder may be taken into consideration for the application of mineral admixture for PHC pile.