Civil Work Monitoring Business Unit

Our customers often ask, "Why is surveying necessary, and what is the purpose of the measurements?" The answer depends on the project's conditions, but for most construction projects, the critical time for surveying is during the foundation work. During this period, the construction encounters complex, uncertain soil properties that are not man-made materials. Designing, calculating, and constructing on soil material becomes challenging and highly uncertain.

Surveying provides data that designers, consultants, or contractors can use to benefit the project. For example, it can be used to control construction work or to verify the stability of retaining walls and other structures adjacent to the project.

Objectives
Benefits obtained from surveying tools include:
  1. Verification of design assumptions or calculation lists. For example, comparing the horizontal movement of retaining walls between design values and actual measurements. Designers can use data to update calculation parameters.
  2. Control of construction efficiency. For instance, designers can specify the warning levels of survey data to project consultants to control the construction performance of the contractor.
  3. Warning or action plan. For example, measuring the displacement value of retaining walls or measuring the settlement value of neighboring houses. If the survey result exceeds the expected value, the designer or consultant can efficiently develop an action plan to solve the problem.
  4. Improving construction methods to reduce the impact on the environment or neighboring properties.
Why do customers choose to use our services?
  1. We have experience and a track record of success in installing and surveying technical instruments, especially in large-scale projects such as the construction of MRT subway systems at various locations throughout Thailand.
  2. We can offer appropriate inspection programs based on project conditions.
  3. We are a civil and geotechnical engineering company, so we have expertise in processing and checking data from geotechnical instruments.
  4. We use STSMonitech® software as a web-based database management system. Customers can access inspection data anywhere, anytime using a web browser on a PC, tablet, or smartphone.
 


Figure 1.  Showing Real-Time display of measurement results on the STSMonitech® software
 
Installation and Monitoring System of Civil Engineering Instruments
 
  • Inclinometer system for measuring movement values in the horizontal direction of structures, such as retaining walls or soil.
 
       
  • "Piezometer" is a sensor used to measure pore water pressure, which is the pressure exerted by water within soil.
 
  • "Observation Wells" are used to measure the groundwater level in the subsurface.
 
     
  • "Extensometer" is used to measure the deformation or displacement of soil at depth. If a single point is being monitored, a Rod Extensometer is used. If multiple points are being monitored at a singer location, a Spider Magnetic is used. 
 
  • "Tiltmeter" is used to measure changes in the inclination or tilt of a structure.
 
   
  • "Crack Gauge" is used to measure changes in the width of a creak. 
 
  • "Strain Gauge" is used to measure the stress and strain of materials such as steel and concrete. This device can be installed with Electrical Resistance Strain Gauge or Vibrating Wire Strain Gauge to measure the strain using the change in electrical resistance or frequency of vibration, respectively.
 
  • "Building and ground settlement marks" are used to measure the settlement or subsidence of buildings, structures, or the ground. This is done using a high-precision leveling instrument.
       
  • "Precise total station" is used to measure the movement of buildings or structures in three dimensions (3D) with high accuracy. This is done using a high-precision theodolite camera.
 
          
  • "Thermocouple" is used to measure temperature in large concrete works.
 
     
  • "Data logger" is a device used to read and record data automatically from sensors. 
 
     
  • "STSMonitech® is a database management software that allows users to access data or view graphs of measurements from anywhere and at any time via a web browser on a computer, mobile device, or tablet. 
  • Vibration monitoring is used for detecting vibrations caused by the operation of machinery, heavy equipment, explosions, construction activities that may cause disturbance to humans, or sensitive equipment. Measuring vibrations is necessary to check for vibrations from the above operations, and to compare the results with vibration standards as data for improving work processes or construction projects."
 
          
 
  • "Sound level monitoring is used for detecting and measuring the maximum and average sound levels over a 24-hour period, as required by the announcement of the National Environmental Committee. This is to alert and encourage improvements to construction methods and processes to be appropriate and within the established standards."
 
  • A dust monitoring station is used to measure the levels of airborne dust particles, including the total suspended particulate (TSP) matter, as well as the finer particle sizes such as PM10, PM4, PM2.5, and PM1 during construction activities. 

 
 
Foundation Testing Service
 
  • Plate bearing test 
In designing a foundation for buildings or road surfaces, it is necessary for engineers to know the value of the soil's load-bearing capacity at that particular location. The Plate Bearing Test is a field test that provides direct measurements of the soil's load-bearing capacity.
 
  • Field CBR test 
The Field CBR test is a direct method of testing the California Bearing Ratio (CBR) index, which indicates the density and quality of a material. It is performed in the field according to the procedures and steps outlined in ASTM D4429-93 standards.
 
  • LWD: Light Weight Deflectometer
LWD, or Light Weight Deflectometer, is a test used for quality control in construction. It is commonly used for testing the bearing capacity of foundations, road works, and soil improvement projects. The result of the LWD test provides the soil's load-bearing capacity and its level of compaction.
 
  • Kunzel stab test 
The Kunzel stab test is a preliminary test used to assess the strength and density of the subsoil layer. It involves driving a Kunzelstab probe into the ground and measuring the resistance encountered during penetration. The data obtained from the test can also be used to estimate the load-bearing capacity of the subsoil layer.