drilling & geotechnical
PT. GEONUSA UTAMA
Erri Hendriawan
erri@geonusa.com
HP: +62 812 960 8187
Thrusted solution... for your peace of mind
SERVICES
To define soil modification is a function of local soil properties and available application techniques. The company has a mission to provide a wide range of alternative soil application technology. Soil underground has varies condition and has varies potential hazard. It might require having pre-construction works such as soil stability, ground water level control, or excavation system. Improvement works might requires such as underpinning, settlement control, or foundation reinforcement.
DRILLING
Thrust Boring
Thrust Boring -Cilegon_MeishaWhen you need a horizontal hole under an obstacle such as road, railway or building, whether to install gas pipeline, water sewage or other purpose, our thrust boring service is the solution. Our method combines thrust boring with rotary and water flush. First, launch and target pits have to be constructed. The boring starts with the pilot pipe drilled until reaching the target pit. Soil cuts are transported out of the hole by water flush from drilling rod. To enlarge the hole, a reamer bit is pulled out or push in and guided by the pilot pipe. Casing or product pipe is installed after the hole cleaning.
Seismic Shothole
Seismic Shothole - Kondur - SLBSeismic shothole is used to install shot gun or explosive to create ground vibration shock as a signal source for seismic survey. The drilling works starts with the site clearance and installation of suitable drainage system. The over flow water from the hole in the drilling and cleaning process will be collected in surface settling pit. The clean water at the top of settling pit flows or is pumped to water pit to be re-used. The drilling advances in the ground using rotary method. Soil cuts are automatically flushed out by the drilling fluid pressure through the annular space between drilling rod and the borehole surface. In order to minimize the sedimentation, the hole is cleaned up using water flow from the rod to push up debris out of the hole. The quality of water over flow from the hole will indicated the cleanliness of the water inside the hole. PVC casing is then installed to prevent the hole from collapsing.
Deep Water Well
Water WellDeep water wells are drilled using rotary drilling machine up to aquifer saturated with groundwater at specified quality. Water or bentonite mud is used as a circulation fluid to displace cutting from borehole and to cool and lubricate the drill bit. The well is cased with PVC or galvanized steel pipe and screen is installed in the aquifer zone. The annular space between the well screen, well casing and borehole wall is filled with gravel or coarse sand to prevent sand and fine sand particles moving from the aquifer formation into the well. The uppermost section of the annulus is sealed with a bentonite clay and cement grout to ensure that no water or contamination can enter the annulus from the surface. Our services include water quality testing, filter installation and pump & piping installation.
SOIL INVESTIGATION
Soil InvestigationThe objectives of the soil investigation services is to investigate geological and geotechnical condition for various purposes such as foundation design, mining exploration, slope stability, road building, etc. Our service covers coring and non-coring drilling and in-situ testing such as Standard Penetration Test (SPT), Cone Penetration Test (CPT), Field Vane Shear Test and Permeability Test. Disturbed and undisturbed samplings taken from the borehole are analyzed at our soil laboratory for soil index and engineering properties such as water content, density, particle size grading, Atterberg limits, specific gravity, unconfined compression test, triaxial test, direct shear test, consolidation, etc
FOUNDATION
MINIPILE
MinipileMinipile is a small bored pile with diameter ranged from 300 - 600 mm. The hole is drilled using wash boring method and cleaned by water flush until the overflow water is clean. The pile is reinforced by deformed steel bars with stirrups to develop moment capacity and to maintain concrete solidity. The concrete pouring uses tremie (multiple segment pipes up to hole bottom) or grouting pump if required. Pilecap is installed at the top of the pile.
MICROPILES
micropile for rehabilitationMicropiles are small diameter piles that can be installed in almost any type of ground where piles are required, with design loads as small as 3 tons and as high as 100+ tons. Micropiles can offer a viable alternative to conventional piling techniques, particularly in restricted access or low headroom situations.
QUALITY CONTROL AND TESTING
Quality Control & TestingQuality control for project supervision such as falling head permeability test for bentonite cement mix, on-site unconfined compression test, plastic/liquid soil density survey, bored pile static axial compressive load test, compaction and field density test, plate loading test, installation of Piezometer, water stand pipes, inclinometer and extensometer, settlement probes, pumping test, data acquisition and monitoring, etc.
more>>>
Pile Anchor Compressive loading test>>>
Pile Lateral loading test>>>
SLOPE STABILITY
Soil Nailing
Soil NailsSoil Nailing is an in-situ technique for reinforcing, stabilizing and retaining excavations and deep cuts through the introduction of relatively small, closely spaced inclusions (usually steel bars) into a soil mass, the face of which is then locally stabilized.
Horizontal drains
Drain PipesPerformed for accommodating underground seepage that relief out water from the slope bank failure zones. This will increase the stability of slope. The drain holes diameter is 89mm ~ 150mm. The Length of drain holes could be design to reach the area behind the failure zone. Drilling inclination could be 10 degrees upward direction to allow gravitation water flows in the drain pipe. The drain pipe could be use PVC pipe. The PVC pipe shall be perforated with 8mm holes or slotted in three rows with 100mm centers spacing except at area from failure lines to end of drain pipe. The perforated section of pipe shall be wrapped in geotextile non-woven material to provide a filter to exclude soil particle from the pipe. The outlet end the pipes shall be grouted.
Micropile Slide Stabilization
Slide StabilizationThe Micropile Slide Stabilization System is used for slope stabilization in all types of soils and rock. A retaining wall is constructed by connecting an array of drilled and grouted micropiles, sometimes in combination with ground anchors, into a reinforced concrete beam constructed near the ground surface. Acting in tension and compression, the micropiles effectively create an integral, stabilized ground reinforcement system capable of resisting driving forces in the slope that could otherwise cause instability or failure.