선박 접이안용 계선주 성능 및 관리 기준에 관한 연구

Abstract

A purpose of this paper is to contribute on setting a maintenance management standard to secure a mooring stability, to utilize on a performance evaluation of bollard by providing inspection method drawing a period of evaluation performance and inspection for maintaining performance, to develop methods and means of performance maintenance of bollard through result on performance analysis and inspection analysis on current bollard technology, understanding the effects of bollard on securing mooring safety.

An analysis on a technological standard of a bollard includes the a research analyzing the damaged case of a bollard in operation installed in the past, evaluating the capacity of strength depending on the standards of new bollard installation for performance maintenance according to pulling capacity or draft force. It also includes a research analyzing the inspection standard for performance maintenance of a bollard according to EUTOTECH BENELLUX Company, the bollard manufacturer and the inspection standard provided by OCIMF, Japan, Korea and lastly, the standard of installation of existing bollards in Korea, Japan, and United Kingdom.

To provide the maintenance management standards, the thesis states the evaluation of a stress and strength of bollards. The inspection of a stress on bollards is carried out on a horizontal force in accordance with pulling capacity, a bending stress by normal force, and shear stress, suggesting the thickness reaching limited yield strength on each applied stress. The thickeness may be utilized as a reference to establish a way of maintenance management and performance evaluation. Through the analysis on a damage of steel thickness to a thickness reaching a yield strength, a longevity of a bollard is examined.

Damage on thickness happens due to corrosion on quality of a material and an abrasion on a mooring cable. A corrosion on quality of a material of a bollard is expected through the corrosion by seawater on carbon and to calculate the abrasion on a mooring cable, measurement result of installed bollard in operation is compared. Through the result of thickness measurement, an annual maximum damage on thickness is evaluated, an abrasion on a mooring cable is calculated by comparing with a corrosion by seawater, proposing the expected damage on thickness to predict a longevity of a bollard.

By the expected damage on thickness, an evaluation is made on damage on thickness in accordance with elapsed time and a longevity of a bollard is expected through the time on reaching a yield strength thickness. Also, an appropriateness of a bollard safety limitation standard is reviewed through the evaluation of maximum pulling force or draft force depending on the damaged thickness.

This thesis is proposed that the measurement of performance evaluation and the measurement of safety inspection based on a longevity of a bollard. With regard to such measurements, it also suggests the way of maintenance management per item.

A standard of maintenance management and performance evaluation on bollards will continuously be enhanced through consistent research and analysis, and the results of such research and analysis is anticipated to be utilized on performing an efficient safety management in port.