Does the rotary excavator need a casing when the bored pile is constructed? Are there any requiremen

<> rotary drilling rig bored piles.

The construction is necessary to use the casing, the specific requirements are no different from other drilling rigs, each side is greater than the pile diameter is not less than 20cm, the height above the ground is not less than 30cm, the depth of the casing depends on the geological and hydrological conditions.

Do you have any requirements? Rotary drilling rigs need to use casing during the construction of bored piles. The specific requirements are the same as those of other rigs.

Each side is not less than 20cm larger than the pile diameter, and not less than 30cm higher than the ground. The depth of the casing depends on geological and hydrological conditions.

Do you have any requirements? When pouring piles on site, the rotary drill rig must use the pile set shell. The specific requirements are no different from other drill rigs.

Each side is not less than 20cm larger than the diameter of the pile, and not less than 30cm higher than the ground. The depth of the pile cover depends on the geological and hydrological conditions.

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<> the full-length steel casing is arranged along the pile length from the ground to the design bench pile tip position, the rotary drilling rig drills gradually according to the design position, and the steel casing continues to grow with the drilling skin coarse socks into the process until the design pile tip ignition position, this operation method does not use mud wall protection, and the steel cutting casing can be used in turnover.

There are the following precautions: (1) The plane position of the casing should be buried correctly, and the deviation should not be greater than 50mm; (2) The elevation of the top of the casing should be higher than the groundwater level and the highest water level of construction, and the borehole of the waterless formation should be higher than the ground because the top of the casing is provided with a slurry overflow port; (3) The bottom of the casing should be lower than the minimum water level of the construction (generally lower, the high-core casing set up by the deep-water sinking and burying file should be dug to a stable depth along the guide frame by means of self-weight, water injection, vibration or hammering, etc., and the depth of the soil should be reached in cohesive soil, and the sandy soil should be 3 4m; (4) The buried and buried casing digging pits should not be too large (generally larger than the diameter of the casing, the surrounding of the casing should be rammed and filled with dense clay, and the bottom of the casing should be buried in a stable clay layer, otherwise the clay should also be replaced and tamped, and the thickness is generally meters.

Hello, I am glad to be able to answer the precautions for burying the casing before the construction of the bored pile as follows: 1. The inner diameter of the steel casing should be 20 larger than the pile diameter, and the vertical line of the product center should coincide with the center line of the pile collapse, unless otherwise specified in the design, the allowable error of the plane is 50mm, the vertical line is not more than 1%, the dry place can be measured in place, and the water area can rely on the guide frame to locate the collapse of the fiber. 3. The casing of dry land and island building can be buried by digging pits, and the clay soil filled at the bottom of the product and around it must be layered and tamped. 4. For the setting of the steel casing in the waters, strict attention should be paid to the plane position, vertical inclination and the connection quality of the two products.

When sinking, the method of pressurization, vibration, hammering and supplemented by soil removal in the cylinder can be used. 5. The height of the product should be higher than the ground or water surface. When there is confined water in the borehole, it should be higher than the confined water level after stabilization.

If the confined water level is unstable or the confined water level is much higher than the groundwater level after stabilization, the test pile should be done first to identify the feasibility of using bored pile foundation in such areas. When in the area affected by the tide, it should be higher than the very high construction water level, and measures to stabilize the water head in the cylinder should be adopted. 6. The embedded depth of the product should be judged according to the design requirements or the hydrogeological conditions of the pile position, not less than in the clay, not less than in the sand, and the embedded depth should be 2 4m in general, and the specific situation should be deepened to ensure the smooth progress of drilling and pouring concrete.

The riverbed with erosion effect should not be less than below the scouring line of the vertical shooting part of the sinking bureau. Bored piles affected by water level fluctuations or underwater construction should be heightened and deepened in height, and should be driven into impervious layers when necessary. 7. The connection of the steel casing requires that there is no protrusion in the cylinder, which should be tensile and compressive, and will not leak.

Preparation of slurry. According to the actual condition of the prescription site of this bridge, it is planned to build two mud pools between pier 3 and pier 4 of platform O. The mud is best suited to high-quality bentonite or pure clay, and I hope mine can help you.

The length of each section is about 2 3m.

There are three kinds of materials for making the casing: wood, steel, and reinforced concrete. The inner diameter of the casing should be larger than the diameter of the borehole (about 20cm larger for the rotary drill, about 40cm larger for the diving drill, impact or punching cone), and the length of each section is about 2 3m. Generally, steel casing is commonly used.

The casing is a steel casing, the wall thickness is 10mm, when the casing is worn and positioned, the center of the pile position is the center of the circle, and the position of the casing is determined on the soil according to the radius of the casing, and after the casing is in place, the pressure is applied to bury the casing into about 50cm. If it is difficult to press down, you can dig out a part of the soil at the hole first, and then place the casing and bury it in the ground. During the burial process, the casing should be checked to see if it is vertical, and if it is found to be deviated, it should be corrected in time.

After the onshore casing is buried in place, the outer side of the casing is backfilled with clay to prevent water leakage around the casing, the thickness of the backfill is about 40 45cm, the top height is higher than the (water surface) ground, and the deviation of the cylinder position from the hole center shall not be greater than 50mm.

Functions of the casing: 1. Positioning; 2. Protect the orifice and prevent the ground stones from falling into the hole; 3. Maintain the mud water level (pressure) to prevent the hole from collapsing; 4. One of the bases for pile top elevation control; 5. Prevent sediment backflow during the drilling process.

Buried casing is a necessary process of bored pile, nothing more than half an hour before the opening (including excavation, casing, surrounding backfill) has no impact on the progress of the drilling process, and the factors affecting drilling are: 1. Rock formation strength (geology); 2. The quality of the drill bit; 3. The type of drilling rig; 4. Drilling rate; 5. The human factor.

To sum up the above content: if it is an individual pile, it can be analyzed from the rock sample (geological condition analysis) whether it is due to whether the characteristics of the rock sample in different parts are consistent, if this happens to each pile, it will be considered from the human factor, indicating that it is more likely that the operator deliberately finds a reason to reduce the process.

The function of the casing is to fix the pile position, guide the direction of the borehole, isolate the surface water from flowing into the wellbore, protect the orifice from collapsing, and ensure that the mud water level in the hole is higher than the groundwater level or the construction water level at a certain height, forming hydrostatic pressure to protect the hole wall from collapse.

The casing is buried in the pile position before drilling, and the production and burial method of the casing is as follows

a.The casing is made of δ=6mm steel plate, the inner diameter of the casing is 20 30cm larger than the design diameter of the bored pile, and the length of the casing is determined according to the geology and water level of the bored pile, and the casing of this project is considered for a long time.

b.The burial of the casing should consider the geology and water level of the pile position, the surface of the project is low liquid limit clay, the groundwater level is very high, the top of the casing should be higher than the groundwater level when buried, higher than the ground, directly placed on the compacted clay layer (thickness 30-50cm), the casing is backfilled with clay around it, and the layers are tamped.

c.Attention should be paid to the quality of the casing burial to prevent the deformation and collapse of the orifice during the drilling process, and to prevent the bottom foot from being suspended due to the perforation of the bottom soil layer of the casing, resulting in collapse holes, outward leakage, slurry leakage and other accidents. The deviation of the embedded casing plane position is less than 5cm, and the deviation of the casing inclination is less than 1%.

d.Before the casing is buried, the center of the pile should be led to the outside of the excavation area by the cross method, four piles should be placed, and the protection should be done (until the hole is formed), and then the center should be led back when the casing is buried, so that the center of the casing and the center of the pile position coincide.

1. Positioning;2. Protect the orifice and prevent the ground stones from falling into the hole; 3. Maintain the mud water level (pressure) to prevent the hole from collapsing; 4. One of the bases for pile top elevation control; 5. Prevent sediment backflow during the drilling process.

The casing is made of 4-8mm thick steel plate, the inner diameter is 100-200mm larger than the diameter of the drill bit, the top surface is higher than the ground 0 4, and the upper part is open 1 to 2 slurry holes. When burying the casing, first dig out the topsoil at the pile hole and bury the casing.

In the soil, its burial depth should not be less than 1m in clay and not less than 1 5m in sand. Its height should meet the requirements of the height of the mud level in the hole, and the mud surface in the hole should be maintained.

More than 1m above the groundwater table. When digging a pit for burial, the diameter of the pit should be 0 8 1 0m larger than the outer diameter of the casing. The deviation between the center of the casing and the center line of the pile position should not be greater than 50mm.

After that, the outside of the casing should be filled with clay and compacted in layers.

The pile hole is positioned to prevent the orifice from collapsing.

That's pretty much what a template means!It is to go to the bottom of the hole, and it must be placed when the pile is started, and the material depends on the actual situation, which is generally iron!