Beijing Tiantai Construction Foundation Co

[Supply of professional foundation survey engineering construction in Huangcun, Daxing District]
Beijing Piling Company was established in 2001 to drive bridge piles, bored piles, equipment piles, wind power foundation piles, and slope protection piles. Beijing Piling Company is a first-class construction enterprise approved by the Ministry of Construction. Mainly engaged in foundation reinforcement, pile foundation (including testing), deep foundation pit support and other types of underground engineering and earthwork engineering construction.
Our company is a technology-intensive management-oriented construction enterprise, with technical personnel and managers accounting for more than the total number of people in the company.
Basic introduction to geological exploration: Drilling, rotary drilling, impact drilling, impact rotary drilling, and excavation operations
Drilling
The use of a drilling rig to drill holes underground to collect cores or conduct geological tests. The depth of engineering geological drilling is usually only tens to hundreds of meters. The diameter of the borehole varies greatly, generally ~, and sometimes large-diameter boreholes with diameters up to 100% are used. Drilling methods in engineering geological exploration can be divided into three major categories.
Rotary drilling
Also known as core drilling, it refers to drilling in which the drill bit under the action of axial pressure uses a rotary method to destroy the rock. The core may or may not be taken. Rotary drilling is the main method for drilling into rocks. In order to maintain the natural state of the rock core, clean water is usually used as the flushing fluid. Rotary drilling can use drill bits of different materials. Commonly used ones include alloy drill bits, steel particle drill bits and diamond drill bits. The former drill bit is suitable for drilling soft to medium hard rock. The latter two drill bits are suitable for drilling into hard rock. In order to take cores from thin layers of weak rock with mud faults or broken rocks, double-layer core tubes or three-layer core tubes are usually used to reduce core wear during drilling. In order to reduce the number of lifts and lowerings of the drill pipe and improve drilling efficiency, rope coring tools can also be used to lift the core out of the drill pipe after each drilling session.
Soil drilling is generally not allowed to use rotary drilling with flushing fluid, but dry drilling can be used.
Impact drilling
A drilling method that uses the weight of the drilling tool to repeatedly impact the bottom of the hole to destroy the soil layer. Impact drilling is divided into two methods: manual impact and mechanical impact. Manual impact drilling tools such as Luoyang shovels are generally suitable for drilling shallow holes and soil layers above the water table. Mechanical impact generally uses mechanical lifting and downward impact, and is suitable for drilling in various soil layers. When drilling in river alluvial gravel layers, in order to obtain gravel samples, flat valve pipe drills are usually used to impact and follow pipe drilling.
Geological Exploration
When drilling in sand and gravel, the driving method can also be used to sample drilling. Use a thick-walled casing with a diameter of ~ to grow an approximately half-closed casing. The lower end is connected to the pipe shoe with a spring, and the upper end is connected to the casing. When drilling, drive the casing to the bottom right of the hole, then pull out the casing, take out the gravel, and then drive the wall protection pipe into the hole. In this way, we drive in and take samples one by one until we reach the final hole.
Impact rotary drilling
A drilling method that combines impact and rotary drilling, that is, the drill bit rotates at the bottom of the hole to break the rock while applying impact load.
Excavation work
Different types of tunnel works excavated on the surface or underground in order to reveal the geological conditions. The main forms include pits, trenches, shafts, and flat holes. Its characteristic is that geologists can directly observe the exposed geological phenomena, take various geotechnical test samples and directly conduct geotechnical in-situ tests.
Geographical environment pit exploration, trench exploration, flat hole and vertical shaft
Discovery pit
A shallow pit with a relatively small depth and cross-section. The cross section is round or square. The depth is generally ~. It is usually used to expose covered rock masses or collect test samples of soil layers and natural building materials.
Trench
A long trench with a small depth. Its length depends on the geological issues pursued. It is mainly used to reveal the boundaries of structural lines, rock strata and physical geological phenomena.
Flat Cave
A horizontal exploration cave excavated from the surface to the interior of the mountain. Flat holes are generally excavated using the drill and blast method, with a section size of 100 m and a length of tens or hundreds of meters, depending on the geological conditions. Flat caves are usually arranged on steeper slopes on both sides of the river valley. Flat caves located below the river bed are also called river bottom flat caves. Various forms of branch tunnels can also be added to the flat tunnel to conduct large-scale in-situ rock mechanics tests.
Shaft
A circular or square exploratory shaft dug vertically from the surface downwards. The diameter is usually ~ to meet the requirements of slag drainage support, etc. When excavating in Quaternary sedimentary layers, the well walls must be supported. When excavating in rocks with cracks and large water inflows, it is sometimes necessary to grout to stop the water and then excavate. Telephone Contact Manager Cheng