• 월간 기계설비
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• s.292
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• pp.70-78
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• 2014

가락동 농수산물도매시장은 지난 1985년 개설된 국내 최초 공영도매시장이자 연간 230만톤 거래 규모의 세계 최대 도매시장으로 서울시민 농수산 먹거리의 약 50%를 담당하고 있으며 전국 공영도매시장 물량의 약 33%를 처리하는 등 전국 농수산물 유통의 중추 기능을 담당하고 있다. 가락시장은 5,000여개 유통업체가 영업 중이며 하루 이용객은 13만명, 출입차량은 6만7,000대에 달할 정도로 과부하를 겪고 있다. 또한 도시 주거환경을 저해하는 혐오시설로 치부돼 이전 압박을 받아왔으며 전반적인 시설 노후화와 유통 수요에 부적합한 물류구조, 주변 교통정체 야기 등의 문제로 시설현대화 필요성도 제기되어 왔다. 이에 따라 서울시농수산식품공사가 지난 2009년 재건축을 통한 시설현대화 사업을 발표하고 기존의 시장 기능을 유지하면서 재건축을 하는 순환식 시설현대화 사업을 3단계(당초 계획은 2009년~2018년까지 10년 예상했으나 가락시장 계획변경 타당성 검토용역 결과에 따라 2025년까지 지연될 것으로 예상됨)에 걸쳐 추진키로 했다. 이에 따라 1단계 사업은 지난 2011년 6월부터 진행되어 2015년 2월 준공 예정이다. 본지는 가락시장 시설현대화 1단계 공사에서 기계설비 및 소방공사를 담당한 (주)성아테크(대표 정해돈) 이완식 현장소장과 시공사인 대림산업(주) 박승재 현장소장을 만나 현장 이야기를 들어 보았다.

• Explosives and Blasting
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• v.38 no.4
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• pp.37-45
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• 2020

Todo was an uninhabited island located in the sea of Pusan Newport. It was a small island with the height of 32 m above sea level, and its area including the submerged part was approximately 24,400 ㎡. Unfortunately, the island was located exactly in the middle of the narrow entrance way to the North and South Container Wharfs of Pusan Newport so that a number of ships had to turn quickly to avoid collision with the island, which frequently caused collisions with other ships or cranes. To avoid such a danger and make the water way wider and deeper, the Ministry of Oceans and Fisheries decided to remove the island. This was believed to make even super-large vessels operate safely in the sea of Pusan Newport so that the competitiveness of the port could be highly enhanced. This paper describes in detail the whole process of the removing work, which was the first case of successful underwater blasting operation using bulk emulsion explosives and non-electric detonators to remove a whole island in South Korea.

• Journal of the Korean Association of Geographic Information Studies
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• v.22 no.2
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• pp.97-106
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• 2019

Today, many smart sensor's measurement instruments are used to check the safety situation of various medium and large bridge structures that should be maintained in the construction facilities, but most of them use the method of measuring and confirming the displacement behavior of the bridge at regular intervals. In order to continuously check the safety situation, various measuring instruments are used, but most of them are not able to measure and measure the displacement and behavior of main construction structures at regular intervals. In this study, GNSS and environment smart sensors and drone's image data are transmitted to wireless network so that risk of many bridge's structures can be detected beforehand. As a result, by diagnosing the fine displacement of the bridge in real time and its condition, reinforcement, repair and disaster prevention measures for the structural parts of the bridges, which are expected to be dangerous, and various disasters and accidents can be prevented, and disaster can be prevented could suggest a new alternative.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.4C
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• pp.137-144
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• 2009

In this research, the ground with smeared zone was reconstructed using the large consolidation test apparatus. And the reconstituted kaolinite samples at different locations were retrieved for the oedometer test. From the oedometer test results the permeability- void ratio-effective stress behavior was investigated. Based on the experimental analysis, spatial differences of permeability according to the drainage distance by both smear and radial drainage consolidation reduced as the consolidation proceeds and eventually disappeared in normally consolidated region. And the spatial variation of permeability by radial drainage consolidation showed larger differences in smaller extent than the spatial variation of permeability by smear.

• The Safety technology
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• no.176
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• pp.20-21
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• 2012

우리나라 욕실문화를 선도하고 있는 기업이라면 단연코 대림B&Co를 꼽을 수 있다. 위생도기업계 최초로 KS 마크를 획득한 것은 물론이고 우리나라에서 처음으로 원피스 사이펀제트 양변기를 출시했다는 것에서 그 면모를 확인할 수 있다. 대림B&Co는 지난 1996년 정부투자기관으로 설립된 '요업센터'를 모태로 하고 있다. 이후 이곳은 1971년 대림요업(주)으로 상호를 변경하면서부터 비약적으로 발전했다. KS마크를 시작으로 일본 INAX사와 기술제휴를 맺어 품질혁신을 위한 발판을 마련한 것이다. 여기에 더해 지난 2008년에는 지금의 대림B&Co로 상호를 변경해 욕실문화를 선도하는 기업으로 자리매김하고 있다. 그렇다면 이처럼 눈부신 성장을 할 수 있었던 원동력은 무엇일까. 이곳 관계자들은 모두 입을 모다 '빈틈없는 안전관리'라고 말한다. 안전과 회사의 성장은 때려야 땔 수 없다는 신념 아래 철저한 안전관리를 해나가고 있는 대림B&Co를 찾아가 봤다.

• Journal of the Korean Geotechnical Society
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• v.23 no.10
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• pp.121-131
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• 2007

This study is to investigate the damage assessment of adjacent structures due to excavation in urban environment. Model tests were carried out for 2 story masonry building and frame structures in various shapes and locations. The damage level of adjacent structures were very differently estimated in accordance with the shape ratio (L/h) of structures, construction stages, and various locations. Therefore the most weak part (bay) of structure must be heavily instrumented and monitored in more details at early stage of constructions. The progressive crack development mechanism at various construction stages was revealed through model tests and crack size indicated more conservative side of damage level on the damage level graph.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.1C
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• pp.31-40
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• 2008

This study presents the assessment of pseudostatic approach for obtaining the internal response of Single Column/Shaft subjected to earthquake loading. In numerical procedure, various lateral load transfer characteristics (p-y curve and Bi-linear curve) were used to model the nonlinear behavior of soil reactions including soil-pile interaction. The analysis using nonlinear soil model could estimate the seismic performance of soil-pile system, despite its relative simplicity. It was found that lateral behavior of single column/shaft obtained from the response displacement method was larger than those by seismic intensity method. To investigate the effects of soil-pile rigidity and pile head condition on the internal pile response, parametric studies were carried out for various soil models. The results from numerical analysis showed that lateral deflection was decreased with fixed condition of pile head and decreasing the soil-pile rigidity. The seismic analysis using Bi-linear model of JRA could reasonably predict the lateral behavior of Single Column/Shaft.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.4C
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• pp.197-203
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• 2008

The end bearing behavior of piles socketed in weathered/soft rock is generally dependent upon the rock mass conditions with fractures rather than the strength of intact rock. Therefore, a database which includes 13 load tests performed on cast-in-place concrete piles and soil investigation data at the field test sites was made first, and new empirical relationships between the base reaction modulus of piles in rock and rock mass properties were developed. No correlation was found between the compressive strengths of intact rock and the base reaction modulus of weathered/soft rock. The ground investigation data regarding the rock mass conditions (e.g. Pressuremeter modulus and limit pressure, RMR, RQD) was found to be highly correlated with the base reaction modulus, showing the coefficients of correlation greater than 0.7 in most cases. In addition, the applicability of existing methods for the end bearing capacity of piles in rock was verified by comparison with the field test data.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1D
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• pp.81-87
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• 2006

The rubblization technique is breaking the aged concrete pavement slab into rubblized concrete aggregate, and use it as an base material at its original position, then builds overlay above the rubblized base. This method has been successively used in USA due to the advantage of good constructibility, cost-effectiveness as well as the capability of preventing of reflection cracks. However, constructibility and economic performance of rubblization on typical Korean concrete pavements needed to be investigate since to typical Korean concrete pavements have thick slab, as well include lean concrete subbase course. Multi-head type breaker suitable for Korean condition was designed and developed. This multi-head type breaker was designed to rubblize old concrete to the suggested optimum rubblized-depth and rubblized-concrete-aggregate size to prevent reflection crack and maintain high bearing capacity. This machine was used for the test of rubblization of old concrete pavement on a non-use old concrete and a in-serviced road. In these two tests, engineering properties of rubblized base and constructability and cost were investigated. In both tests, the old concrete rubblized to targeted size and depth, and high-level bearing capacity was achieved. Also, superior constructability and lower cost compared with traditional reconstruction was examined.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.2B
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• pp.161-170
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• 2006

A tracer test technique using a radioisotope was proposed to investigate pollutant mixing characteristics in rivers. The main advantages of radioisotope as a tracer in field tests are that it can be detected easily, and that its detection range is quite large. Also, using the radioisotope, the amount sorbed by the bed material and the biota may be a minimum. Field tracer tests were conducted at seven different sites in natural rivers with various meandering pattern. Based on the acquired data, the behavior of the tracer cloud in the intermediate-field was examined two-dimensionally, and dispersion coefficients were calculated using several evaluation methods. Results revealed that the tracer cloud was transported skewed to the outer bank and dispersion coefficients in bends were larger than those in straight reaches.