Pile Must Enter The Rock, But How Much Do You Know about The Rock?

Rotary digging pile is more and more big, reportedly design of existing pile diameter 6.3 meters, ningbo six cross island project need to use the SANWARD1280 and XCMG1600.

The drilling rig is also getting deeper and deeper, our 550 drilling rig with 6 24 meters friction rod can drill 132 meters.

As the type of rotary drilling rig becomes larger and larger, the structure of drilling tools is more and more optimized, the performance of consumables is more and more improved, and the stones that can be hit by rotary digging are harder and harder.

Originally more than 60MPa are considered to use a cone, now to 100MPa, but also want to use the pick to try, really have confidence in the machine torque and pick.

The pile driver knows that the end pile must enter the rock, but how much do they know about the rock?

Rock entry generally refers to the entry of weathered rock.

Medium weathering is a kind of weathering degree of rock.

- According to the degree of weathering, the classification is: residual soil, full weathering, strong weathering, moderate weathering, breeze and unweathered.

One thing you should note:

- Mudstone and semi-diagenesis can not be classified into weathering degrees.

The depth of the pile into the rock is generally 1-2 times the pile diameter.

How are the rocks in here classified?

- Rocks can be divided into magmatic rocks (igneous rocks), sedimentary rocks (igneous rocks) and metamorphic rocks according to their origin.

Common hard stones,

For example, granite and basalt belong to magmatic rocks;

Common soft stones,

Such as mudstone, shale and argillaceous sandstone, belong to sedimentary rocks.

Common stones that are not easy to hit,

Such as granite gneiss, schist, belongs to metamorphic rocks.

The three types of rocks are not the same layer, but continue to transform and cycle with the addition of time.

- In the process of rising to the surface, magma gradually condenses into magmatic rocks through differentiation and other processes due to heat loss.

Underground condensation, called intrusive rock,

Such as granite, according to the depth of the ground is divided into deep rocks and shallow rocks.

Extruded condensation is extruded rock, such as basalt and andesite.

- Sedimentary rocks are rocks formed by rocks and minerals broken into detrital materials under the action of internal external forces, and then transported by water flow, wind and glaciers, piled up in continental low-lying areas or oceans, and then cemented, compacted and other diagenetic rocks.

The genesis of sedimentary rocks generally includes clastic deposition, chemical deposition and biological deposition.

- The main characteristic of sedimentary rocks is that they have bedding.

Because of their special formation mechanism, sedimentary rocks are known as the pages and words that record the history of the earth.

- Metamorphic rocks are rocks formed by metamorphism of magmatic or sedimentary rocks under the action of high temperature, high pressure or other factors.

In terms of hardness, sedimentary rock is soft, magmatic rock is hard, metamorphic rock is medium, but the structure is irregular and difficult to deal with.

The beautiful jade in life is generally metamorphic rock.

Rock hardness, according to the saturated uniaxial compressive strength (MPa) can be classified into 5.

- Hard rock: >60; Harder rock: 30-60

- Softer rock: 15-30; Soft rock: 5-15; Very soft rock: <5

Note: 1, when the saturated uniaxial compressive strength data cannot be obtained, point load test can be used, and the specific standard is "Engineering Rock Grading Standard". 2, when the integrity of the rock mass is extremely broken, it is not necessary to classify the hardness.

Magmatic rocks are the product of magmatic activity,

Sedimentary rocks are the result of being deposited by external forces,

Metamorphic rock is metamorphic by high temperature, high pressure or other factors.

That's all for the rocks today.