What is Geoprobe sampling?
Geoprobe sampling involves taking samples from a specific location at defined depths. It can happen from the ground level down, or beginning at a certain depth. For taking samples from ground level down, the rig drives an outer casing, with a drive shoe installed, into the ground.
Is Geoprobe direct push?
Geoprobe pioneered Direct Push Subsurface Sampling Technology in 1987. Geoprobe direct push machines rely on a relatively small amount of static (vehicle) weight combined with percussion as the energy for advancing a tool string.
How does a Geoprobe work?
It uses static force and the dynamic percussion force of the GH40, GH60 or GH80 Soil Probing Hammer to advance small diameter sampling tools. It rearranges particles in the subsurface by application of weight and percussion to advance a tool string and produces no cuttings in the process.
What is direct push sampling?
FOR SOIL AND GROUND WATER SAMPLING Direct push technology (DPT) devices are investigation tools that drive or push small- diameter rods and tools (typically not exceeding four inches in diameter) into the subsurface by hydraulic or percussive methods. Direct push can be used for a number of applications.
How does a split spoon sampler work?
The split spoon sampler is a tube split into two equal halves lengthwise. The two halves are locked together during the sampling activities and released to retrieve the samples. At bottom end of the sampler sits a driving shoe. This is what cuts into the soil and provides the sample that goes up into the tube.
How does hollow stem auger work?
What Is Hollow Stem Auger Drilling? This kind of drilling is like solid stem, except the Claw Bit is attached to a hollow stem, instead of a solid one. Once the bore hole reaches the desired depth, the hollow stem acts as a temporary casing, keeping the sides of the bore hole from caving in.
What is Geoprobe?
geoprobe in British English (ˈdʒiːəʊˌprəʊb) noun. geology. a probing device used for sampling soil.
How does direct push drilling work?
Direct push technology, often referred to as DPT, uses the static weight of the rig combined with a hydraulic hammer to advance tooling or instrumentation through the subsurface. Unlike rotary, the drill cuttings are not removed from the hole.
Where is split spoon sampler used?
A series of consecutive cores may be extracted with a split-spoon sampler to give a complete soil column profile, or an auger may be used to drill down to the desired depth for sampling. The split spoon is then driven to its sampling depth through the bottom of the augured hole and the core extracted.
What is standard split spoon sampler?
Standard Split Spoon Sampler. A standard split spoon sampler consists of a thick wall tube having outer diameter of 50.8 mm and internal diameter of 35 mm and a length of 6OO mm. The tube has a drive shoe attached to its bottom and coupling head at top to accommodate the drill rod, used for testing.
How deep can you drill with hollow stem augers?
Depths of 200-plus feet can be reached utilizing a 4.25-inch hollow-stem auger, whereas 10.25-inch augers can reach a maximum depth of approximately 75 feet. Hollow-stem augering can present some disadvantages. It cannot penetrate cobbles, boulders and most rock formations.