EJtech

사업분야

MEASURMENT AND SHM

HOME > BUSINESS > MEASURMENT AND SHM



synopsis

EJtech equipped to provide exact measurement and analysis of geotechnical soil structures like roads, subways, tunnels, dams, high-speed railroads, and harbors as well as of excavations for soft-grounds and downtown areas. We monitor the static and dynamic behavior of civil engineering structures such as bridges and LNG tanks.

We also perform the instrumentation consulting, installation, measurement, and monitoring. Through using the monitoring program, EJtech analyzes the monitored data rapidly and accurately, and hence it provides the most reliable and safe construction environment.

  • Cheonan-Nonsan Highway Station 6, Section 1 Construction / Soft ground Instrumentation and Consulting
  • Youngin-Dunpo Road Expansion and Pavement Works / Instrument Installation and Management
  • Daegu-Busan Highway Station 8 Construction / Instrumentation and Consultation
  • Hupo-Suga Road Construction / Instrumentation and Consulting, Analysis
  • Kunjang New Port Southern Inner Wall (Station 2) Construction / Instrumentation and Consulting
  • Sihwa Multi-Techno-Valley Station 3 / Instrumentation and Consulting
  • Gwangyang Port Western Rear-side Complex Station 2 Construction / Instrumentation and Consulting
  • Incheon Northern Port, Dredged Soil Dumping Ground Construction/ Instrumentation and Consulting
  • Busan New Port, Dredged Soil Dumping Ground, Shore Protection Work (Station 2), Compulsion Replacement (CD7-1 Section)
  • Gunjang New Port Southern Inner Wall (Station 2) Construction (T/K) / Instrumentation and Consulting
  • Incheon Northern Port, Yeongjong-do Dredged Soil Dumping Ground, Shore Protection Work / Instrumentation and Consulting
  • Busan Private Investment Port Stage 1-1 / Instrumentation and Consulting
  • Incheon Southern Port / Instrumentation and Consulting
  • Busan New Port Pier bridge and Multipurpose Port / Instrumentation and Consulting
  • Yeosu Old Port Maintenance Work / Instrumentation and Consulting
  • Gwangyang Port West-Side Rear Complex Station 2 Construction / Instrumentation and Consulting
  • Ulsan New Port South Breakwater and Other Constructions (Station 2) / Instrumentation and Consulting
  • Hongbok Reservoir Alternative Instrumentation and Consulting
  • Gampo Dam Construction / Instrumentation and Consulting
  • Mureung Dam Construction / Instrumentation and Consulting
  • Yecheon Dam, Seismometer Purchase and Installation (11 Dams)
  • Yeongcheon Dam Assistant Spillway Underground (Instrumentation) Instrument Installation
  • Buhang Multipurpose Dam Construction Instrumentation and Consulting
  • Hwabuk Multipurpose Dam Construction / Dam Instrumentation and Consulting
  • Ahndong Dam, Emergency Spillway / Emergency Spillway Instrumentation and Consulting
  • Grand Department Store, Gangseo Site / Instrumentation and Consulting
  • Daelim Dogok Acroville / Instrumentation and Consulting
  • Daewoo Trump World I & II / Earthwork Construction Supervision, Instrumentation and Consulting
  • Seocho Project Block C Construction / Automatic Instrumentation
  • Goodmorning City Construction Instrumentation and Consulting
  • Cheonggyecheon Restoration Station 1, 2 / Instrumentation and Consulting
  • Kimpo Skypark Main Structure and Subway Line 5 / Automatic Instrumentation and Consulting
  • FC Seoul Construction Subway Vestibule Retaining Wall Instrumentation and consulting, Adjacent Structure Structural Assessment
  • Daegu-Pohang Highway Construction Station 2, 5 / Instrumentation and Consulting
  • Jinju-Tongyeong Highway Station 24 / Instrumentation and Consulting
  • Pyeongtaek-Eumseong Highway, Anseong-Eumseong Construction Station 6 / Instrumentation and Consulting
  • Cheongwon-Sangju Highway Construction (Station 3) / Instrumentation and Consulting
  • Jeonju-Gwangyang Highway construction Station 3, 4 / Instrumentation and Consulting
  • Yeongdong Line, Dongbaksan-Dogye Railway Relocation / Tunnel and Temporary Facility Instrumentation and Consulting
  • Jungang Line, Jecheon-Dodam Double Train Track / Instrumentation and Consulting
  • Taebaek Line, Jecheon-Ssangyong Station 1 Double Railway Construction / Tunnel and Jangpyeongcheon Bridge Temporary Facility
  • Highway Station 10, Jangheung-Gwangyang Construction (Station 8) / Instrumentation and Consulting
  • Gyeongjeon Line Hman-Jinju Double Train Track Private Investment Facility Enterprise (Station 2-2) / Tunnel Instrumentation and Consulting
  • Jinju-Gwangyang Double Train Track Station 5, Roadbed Construction / Instrumentation and Consulting, Soil Survey
  • Seoul Subway, Station 6-1, 7-18, 7-19, 7-25, 7-26, 904, 906, 914
  • Daejun, Station 1-5, 1-6, 1-8 Instrumentation
  • Shinbundang Line, Station 2, 4
  • Gyeongbu High-Speed Railway, Station 14-2, 8-1, 9-3
  • Incheon Acquisition Base Stage 2, 2nd Expansion, Seawater Intake Structure Construction / Instrumentation and Consulting
  • Incheon Acquisition Stage 13 / Instrument Installation, Instrumentation and Consulting
  • Incheon Production Base Stage 2, 3rd Construction / Instrument Installation (#18 Tank)
  • Tongyeong Production Base Stage 2, 1st Construction (#4,5 Tank) Instrument Purchase and Installation
  • Tongyeong Production Base Stage 2, 2nd Extension (#8, 9, 10) / Instrumentation and Consulting
  • Tongyeong Production Base Storage Tank (#1~3) and Main Facility Construction / Instrumentation and Consulting (Tank 1,2)
  • Daegu-Pohang Highway Station 3 / Excavated Slope Instrumentation and Consulting
  • East Highway (Donghae-Gangneung) Extension Station 4 / Slope Instrumentation and Consulting
  • East Highway (Donghae-Gangneung) Extension Station 4 / National Highway 7 Slope
  • Yangpyeong National Highway Line 37, Flood Damage Restoration / Slope Stability Instrumentation and Consulting
  • Excavated Slope / Instrumentation and Consulting
  • Jungbu Central Inland Highway, Station 11 / Slope Instrumentation and Consulting
  • Yanghwa Bridge, Performance Improvement Work / Instrumentation System Build
  • Jindo Bridge / Instrumentation, Maintenance, Management and Consulting
  • Seohae Bridge / Basic System Set up for Maintenance and Management, FCM Bridge Instrumentation and Consulting
  • Yeongjong Bridge / Maintenance, Management, Instrumentation System Set up and Consulting
  • Gwangan Mainroad Suspension Bridge / Instrumentation and Consulting
  • Changsun-Samchunpo Bridge Construction Work (Station 2), Samchunpo Bridge / Instrumentation and Consulting
  • Incheon International Airport (Land to Island) Suspension Bridge / Instrumentation and Consulting
  • Cheongpung Bridge / Maintenance, Management, Instrumentation and Consulting
  • Yeosu-si Bypass Road Construction, 2nd Dolsan Bridge Construction / Maintenance, Management, Instrumentation and Consulting


SOFT GROUND

Soft ground observational procedure includes wide range of work involving: complement of expected difference between ground movement characteristics & actual ground, and analysis of the changes caused by execution and its effect on structure. It also involves analysis of measurement results, and study of the stability at the stage of construction and later stages. With this, we go back to the original design and plan changing of the design, and construction method.

계측시스템 구성

계측시스템 센서

계측시스템 구축

계측시스템 분석화면

계측시스템 분석사례

계측기기(예)

NAME PURPOSE Install Position
Inclinometer Through measuring the horizontal displacement along the depth of soil due to embankment, decide the safety of soft soil and adjust the speed of embankment. Bore from support layer till end of embankment body then install
Water Level Meter Measure the alteration of water level under the ground. Bore until underground aquifer outside the influence of embankment then install
Settlement Plate Through measuring the settlement caused by embankment, predict the long term settlement and decide the safety of soil. The center, left, and right side of embankment body
Settlement Extensometer Measure the settlement of soil layers due to embankment. Bore until the center support layer of embankment body then install
Piezometer Measure the underground pore water pressure caused by embankment and evaluate the tendency of consolidation. The center of embankment body (Install at the clay layer)


HARBOR(RECLAIMED LAND)

The goal is more safely and economically by studying and analyzing expected littoral ground movement and execution procedure that occur at the site when designing. If required, complementing of execution method such as changing construction method, controlling loading load and task strength of construction are done.

계측기설치

계측시스템구성

계측기설치

NAME PURPOSE Install Position
Piezometer Measure the pore water pressure of the filtering part of riprap and the backside of reclaimed part. The filtering part of riprap and the backside of reclaimed part
Water Level Meter Measure the tidal difference and verify the filtering function. The filtering part of riprap and the front side of caisson
Tiltmeter Measure the slope of pile and caisson. Normal piles, Angled piles, and the front side of caisson
Wireless Settlement Measurement Through measuring the settlement of soil, predict the long term settlement and decide the safety of soil. Foundation riprap and the bottom of original ground
Wired Settlement Measurement Through measuring the settlement of soil, predict the long term settlement and decide the safety of soil. The bottom of riprap and the original ground
Digital Settlement Plate Through measuring the settlement of soil, predict the long term settlement and decide the safety of soil. Backside of reclaimed part
Settlement Plate Through measuring the settlement of soil, predict the long term settlement and decide the safety of soil. Backside of reclaimed part
Automatic Settlement Extensometer Measure the settlement of soil layers. Backside of reclaimed part
Settlement Extensometer Measure the settlement of soil layers. Backside of reclaimed part
Automatic Inclinometer Measure the horizontal displacement along the work process. Back filling riprap and the backside of wave dissipating block
Strain Gauge Measure the stress of piles. Normal and angled piles


DAM/RESERROIR

EJtech installs instruments to analyze the behavior of dam during or after construction. Through the analysis, it makes sure the stability of dam. Long-term monitoring system is necessary to dam instrumentation.

계측기설치도

계측시스템 구성



TUNNEL

Tunnel measurement is one of the large scale ground measurement parts. It is used to analyze the structural safety of tunnels starting from the tunnel excavation to the completion of concrete lining.

Targeted structures : Railway tunnel (Incl. high-speed railway) Subway tunnel, ,Road tunnel

NAME PURPOSE INSTALL POSITION
Convergence Meter Verify the inside section displacement, displacement speed, and convergence. Inside section of tunnel
Crown Settlement Meter Verify the settlement, its speed, and convergence. Fore end of tunnel
Shotcrete Stress Meter Verify the inside stress and the supporting effect of shotcrete. Inside shotcrete
Rock Bolt Axial Force Meter Verify the axial stress according to depth, distribution status, and supporting effect of rock bolt. Soil behind tunnel
Rock Bolt Pull-out Test Measure the load of rock bolt. -
Underground Displacement Meter Verify the displacement and relaxation region around tunnel, and optimum length of rock bolt. Soil behind tunnel
Inclinometer Measure underground horizontal displacement of portal and shallow soil surface section. Portal and shallow soil surface section
Borehole Extensometer Measure the borehole settlement of shallow soil surface section. Upper ground of tunnel
Surface Settlement Measurement Measure the settlement of upper surface of tunnel. Upper ground of tunnel
Water Level Meter Measure underground water level along excavation. Upper ground of tunnel
Piezometer Verify the action of seepage pressure and drain ability of drainage layer. Soil behind tunnel
Lining Stress Meter Assess the lining safety through the verification of inside stress status. Inside the lining
Full Face Measurement Meter Measure the inside section displacement of tunnel during conjunctive use. Inside shear section of tunnel


SLOP

Slope monitoring is primarily used to cut-slope as measuring the slope angle and water level EJtech provides the most advanced technology with EunJin E&C.

NAME PURPOSE INSTALL POSITION
Inclinometer Measure underground horizontal displacement of the slope and assess the safety. slope
Water Level Meter Measure the water level of the slope slope
Piezometer Measure the pore water pressure of the slope. slope
Extensometer Measure the displacement of slope's upper-lower or upper-surface side. Top of slope
TDR Measure the movement of the slope according to depth. slope
Slope Settlement Measurement Measure slope movement in 3 dimention. slope.



EXCAVATION

Downtown excavation measurement is used for predicting the safety of sites near trench for foundation construction of large scale structure and public structure and finding a suitable solution.

계측기기(예)

NAME PURPOSE Install Positions
Surface Settlement Meter Measure the settlement of surface during excavation. Soil at the backside of braced wall or contiguous structures
Water Level Meter Measure the groundwater level during excavation. Backside of braced wall
Earth Pressure Cell Measure the soil pressure change of bracing structure or substructure. Backside of braced wall or substructure
Load Cell Measure the axial load change of supporting beam, earth anchor, etc, during excavation. Supporting beam and earth anchor
Strain Gauge Measure the stress change of bracing structure's member, concrete, etc. Soldier pile, wale, strut, various steel members, etc.
Inclinometer Measure the horizontal displacement according to the depth of backside ground during excavation. Soil at the backside of braced wall or contiguous structures
Structure Inclinometer Measure the slope alteration status of major contiguous structures. Skeleton and bearing wall of contiguous structures
Crack Gauge Confirm the process of crack during construction. Neighboring buildings around construciton site
Piezometer Measure the pore water pressure of ground change during excavation. Ground behind the braced wall
Investigation of the neighboring structures - -

LNG Tank

Measurement during construction to supply information which can be used to obtain stability of LNG Tank structure. It includes installation of Bottom Slab, Out Wall, Thermometer on Roof, Concrete Stress Meter, Reinforcing bar Stress Meter, Horizontal Inclinometer on the Tanks to measure concrete temperature and stress.



BRIDGES

A bridge is like a creature, therefore, bridge construction is like creating a creature. As the time passes by this creature becomes old which means the performance of the bridge deteriorates. Humans require treatments if sick in order to increase their life-span. A bridge also requires an improvement to use it for a longer period of time. Of course a bridge is not a human, therefore if the cost to improve is considered too expensive lockout of the bridge is inevitable. However, as in humans, treating bridge at the right time can increase its life-span as well as it's safety and usability at low cost. This then leads to the improvement on the efficiency of maintenance cost.

Load Measurement Type Usage Plan
Fix Acceleration, Displacement, Stress, Inclination Bridge Self-Load Causing Structural Deformations
Temperature Outside Temperature The magnitude of thermal load caused by daily and annual changes
Wind Wind Direction and Speed Intensity of wind load about bridges and users
Earthquake Earthquake Acceleration Input ground acceleration by earthquake
Transportation Load Magnitude and Frequency of Transportation Load Intensity and frequency of transportation load as major live load
Load Measurement Type Gain Signal Usage Plan
Traffic
Fix
Sag Sag of Main Girder Sag of main girder due to loads, bridge usability and safety inspection
Temperature Expansion Joint Joint Displacement Expansion joint displacement / usability analysis due to the change of temperature
Wind
Traffic
Earthquake
Dynamic Property of Bridge Vibration Acceleration
Seismic Acceleration
Analysis of factors that cause the dynamic characteristic of bridge and seismic load
Temperature
Wind
Traffic
Deflection of materials Strain / Stress Material Resistance
Temperature
Traffic
Fix
Cable Tension Cable Vibration Acceleration Analysis of cable tension due to the change in temperature and traffic
Traffic
Fix
Inclination Inclination Analysis of inclination of piers and main girders
Temperature Temperature Temperature of Material Measurement of the differential temperature and hydration heat
TOP