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2015 Vol.14, Issue 3
Performance Evaluation of the Vibro Hammer with Variable Amplitude by Field Tests

현장실험을 통한 저진동･저소음 진폭가변형 진동해머 성능 평가

Jin-Tae Han1
,
Joonyong Lee2*
,
Changho Choi3
,
Jeong-Yel Park4
한 진태1
,
이 준용2*
,
최 창호3
,
박 정열4
1Senior Researcher, Geotechnical Engineering Research Division, Korea Institute of Civil engineering and building Technology
2Post Doctoral Researcher, Geotechnical Engineering Research Division, Korea Institute of Civil engineering and building Technology
3Research Fellow, Geotechnical Engineering Research Division, Korea Institute of Civil engineering and building Technology
4President, Daedong Eng. Co., Ltd
*교신저자. *Corresponding Author. 
30 September 2015. pp. 1-12
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Abstract

During installing sheet piles for an impermeable wall or a retaining wall, vibratory hammers are widely used. Among vibratory hammers, a hydraulic hammer is used most commonly. However, a hydraulic hammer causes excessive vibration and noise due to resonance by change of natural frequency according to movements of eccentric shaft when the hammer starts and stops. In this study, new variable amplitude type hammer is developed in order to reduce the vibration and noise due to resonance produced in starting and stopping the hammer. By controlling horizontal angle in two pairs of eccentric body inside of the hammer, the amplitude and vibration of the new hammer can be controlled. The performance tests with the new hammer and existing hammers such as the hydraulic hammer and electric hammer are carried out, and the new hammer shows reduced vibration and noise results in comparison with existing hammers from performance tests. Also, this study shows that penetration rates of sheet pile using the new hammer increase due to impellent force of a backhoe in comparison with the electric hammer and penetration rate increase in comparison with a general hydraulic hammer, since the new hammer can control the amplitude during penetration of sheet pile according to soil condition.

Keywords
Sheet pile
Vibro-hammer with variable amplitude
Field test
Ground vibration
Noise

국내외에서 차수벽이나 흙막이 벽체로 많이 사용되고 있는 강널말뚝의 관입시 일반적으로 진동해머를 이용하여 시공하고 있다. 진동해머 중에서도 유압식 진동해머가 많이 사용되고 있는데, 진동해머의 시동을 켜고 끌 경우 진동해머 편심축의 이동에 따라 고유진동수의 변화로 진동해머에서 공진이 일어나 진동 및 소음이 크게 발생하는 문제점이 있다. 이에 본 연구에서는 일반 유압식 진동해머에서 발생하는 공진 발생에 의한 진동 및 소음을 줄이기 위하여 진폭가변형 유압진동해머를 개발하였다. 개발된 진폭가변형 유압진동해머는 두 쌍의 편심체 수평 각도를 조절하여 진동수 및 진폭을 조절할 수 있으며, 일반 유압식 진동해머와 개발된 진폭가변형 유압진동해머의 기진체 현장실험을 이용한 성능 평가 비교를 통해, 기존 일반 유압식 진동해머에 비해 진폭가변형 유압진동해머의 진동 및 소음이 감소함을 확인하였다. 또한 현장실험 결과 진폭가변형 유압진동해머는 굴삭기의 추력으로 인해 기존 전기식 진동해머에 비해 관입속도가 증가하였으며, 일반 유압식 진동해머에 비해서도 진폭가변으로 지반조건에 따라 관입속도가 빨라질 수 있음을 확인하였다.

References
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 14
  • No :3
  • Pages :1-12
  • Received Date : 2015-03-23
  • Revised Date : 2015-07-24
  • Accepted Date : 2015-07-31
  • DOI :https://doi.org/10.12814/jkgss.2015.14.3.001
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