There is silt under the foundation of the construction elevator, can it be treated as a foundation b

Powder spraying pile does not belong to the pile foundation, and belongs to one of the measures for foundation reinforcement treatment.

Powder spraying pile belongs to composite foundation, which is a kind of foundation treatment, not pile foundation.

Powder spraying pile is also a kind of pile foundation.

No, powder spraying piles belong to soft foundation treatment.

"Technical Code for Building Foundation Treatment" The cement fly ash gravel pile (CFG pile) method is suitable for treating cohesive soil, silt, sand and plain fill soil that has been consolidated by its own weight. The applicability of silty soils should be determined according to regional experience or through field tests.

The soil layer with relatively high bearing capacity should be selected as the bearing layer at the end of the cement fly ash gravel pile.

You seem to be a point project, this is best to use powder spraying pile, and then it is best not to destroy the surface fill to expand the stress area and make the foundation bigger. It should be noted that the moisture content of the bottom sludge should not exceed 70%, otherwise it will be difficult for the powder spraying pile to become a pile.

If the large area is cheaper, it is vacuum preload or stack preload.

Concrete mixing pile is feasible. Cement mixing method is a method used to strengthen saturated and soft clay low foundation, it uses cement as a curing agent, through a special mixing machinery, the soft soil and the curing agent are forced to stir in the depth of the foundation, and a series of physical and chemical reactions between the curing agent and the soft soil are used to harden the soft soil into a high-quality foundation with integrity, water stability and certain strength.

The cast-in-place piles you are talking about are not feasible, and the replacement is also unreasonable.

Powder spraying pile can be used for earthwork support, can also be used for pile foundation, should be calculated and then determined.

Powder spraying pile, also known as reinforced soil pile, is a form of deep stirring method to strengthen the foundation, which is a method of using powder-like curing agent to stir soft foundation. It is suitable for reinforcing saturated soft clay of various origins, and is often used in China to reinforce silt, silty soil, silt and cohesive soil with high water content.

Powder spraying pile belongs to a form of deep stirring method to strengthen the foundation, also called reinforced soil pile. Deep stirring method is a novel method for reinforcing saturated soft clay foundation, it is the use of cement, lime and other materials as the main agent of curing agent, through the special mixing machinery on the spot soft soil and curing agent (slurry and powder) forced stirring, the use of curing agent and soft soil between a series of physical and chemical reactions, so that the soft soil hard into a high-quality foundation with integrity, water stability and a certain strength. Powder spraying pile is a method of using powder-like curing agent for soft foundation stirring.

Powder spraying piles are suitable for reinforcing saturated soft clay of various origins, and are often used in China to reinforce silt, silty soil, silt and cohesive soil with high water content.

There is too little information on silty silty clays in the title to discern the specific method used.

The properties of specific silty silty clay such as: location, thickness, distribution, groundwater height, whether liquefied, intensity fortification, etc.

In general, the measures that may be taken are: soil replacement is suitable for silt, silty clay, shallow and not too thick; Ground strengthening measures such as ash piles, powder spraying piles, rammed and expanded piles, and strong compaction.

Powder spraying pile construction:

1) Pay-off positioning.

After the plain ground is rectified, according to the design drawings and line control piles, the pile position of each powder spraying pile is determined with theodolite and steel tape measure on site, and the soil layer is inserted with bamboo sticks for marking, and the pile grid diagram is drawn.

At the same time as leveling the site lofting, the test operation adjustment of the drilling rig is carried out.

2) The drilling rig is in place and centered.

After the pay-off positioning is qualified by the supervision and acceptance, the drilling rig can be moved to the pile position, the bamboo sticks are aligned, and the verticality of the frame and the diameter of the drill bit can be reviewed.

3) Drilling. Start the main motor and the air compressor, and wait for the air compressor to supply the drill rig from slow to fast to accelerate the clockwise vertical drilling, and the drilling depth is displayed with a depth gauge or a scale on the derrick.

4) Ash spraying and stirring lifting.

After the control double spiral mixing head reaches the elevation of the design pile bottom, the drilling rig is changed to rotate counterclockwise, start the ash feeder, and only start to lift the drill bit after the cement ash reaches the ash spray port for a certain time (--general-minutes), while spraying powder, stirring, and lifting.

5) Re-stir. When the drill bit is lifted to a depth of 5 meters below the ground, stop the ash spraying, close the ash feeder, start the air compressor to supply air, the drill bit quickly shifts the gear and rotates the drilling to the specified remixing depth, stirs in situ for 1 minute, and then repeats the previous mixing and lifting process in reverse to ensure that the remixing length meets the design requirements.

6) Pile shifter.

After the re-stirring, the air compressor is turned off, the ash feeder dissipates all the pipeline pressure, and then the main motor of the drilling rig is shut down, and then the hydraulic step is started, the drilling rig is displaced, and the top of the powder spraying pile is 50cm backfilled with the same amount of cement soil.

Precautions for the construction of powder spraying piles:

1) The cement should be fresh and dry, and the cement ash should be sieved to prevent large pieces of debris from mixing into the ash tank.

2) The amount of powder in the ash tank should be greater than 450kg during construction, and the ash tank should be tightly sealed after adding ash to avoid air leakage.

3) The pre-stirring sinking speed should be 1 5m min, and the sinking speed is controlled by the current monitoring table of the electrical control device, and its working current should not be greater than the rated value.

4) When pre-agitating and sinking, the drill should be drilled only when there is high-pressure air injection from the drill bit.

5) When spraying powder, it is necessary to ensure that the cement ash reaches the ash spraying port for a certain time.

6) In order to ensure normal powder spraying, the air pressure in the ash tank should be higher than the air pressure of the pipeline, and the oil-water separator should be maintained frequently to keep the compressed air dry.

7) When lifting ash spraying, the speed is 0 8m min, which effectively ensures the stability of remixing and lifting speed, and ensures the consistency of ash quantity.

8) The remixing and lifting speed is 0 8m min, which effectively ensures the stability of the remixing and lifting speed and ensures the full uniformity of the stirring.

9) When an accident occurs in the process of piling and affects the quality of the pile, measures should be taken within 12 hours, and the overlapping length is 1 0m, otherwise it will be re-laid.

10) The original construction record of each pile driver should be done in time to ensure the cleanliness of the original record.