Integrated oriented vacuum well point pipe

Abstract

The invention discloses an integrated oriented vacuum well point pipe. The integrated oriented vacuum well point pipe comprises an outer layer pipe; an inner layer pipe is sleeved with the outer layerpipe; the outer layer pipe is downwards in threaded connection with a short pipe; the short pipe is downwards welded with a partition plate; the partition plate is downwards welded with a hollow cone; a plurality of water outlets are formed in the side walls of the hollow cone; the bottom end of the outer layer pipe is connected with the partition plate; a check valve is arranged on the partitionplate in the inner layer pipe; the top end of the inner layer pipe is bent, and then stretches out of the top of the side wall of the outer layer pipe; a seal ring is arranged between the outer layerpipe and the inner layer pipe at the top end of a vacuum pumping area; a plastic drainage barrel sleeves the inner layer pipe; a plurality of bulges are distributed on the plastic drainage barrel atintervals; a plurality of inner pipe water inlets are formed in the inner layer pipe; a plurality of outer pipe water inlets are formed in the outer layer pipe; a geotextile layer is mounted on the inner wall of the outer layer pipe; and a barrel-shaped metal net layer is arranged on the inner surface of the geotextile layer. A hoist is not needed in the mounting process, a drainage channel does not depend on poured coarse sand, sludge blocking can be prevented on a soft soil layer, oriented water precipitation is achieved, the influence on an environment is small, and the cost is relatively low.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a vacuum well point pipe and a corresponding dewatering process. Background technique [0002] In the construction of generally deep underground projects, most of the construction methods of grading or supporting excavation are adopted. When the construction depth is below the groundwater level, the foundation pit often encounters underground water gushing or quicksand invasion. Therefore, it is necessary to use Artificially lowering the groundwater table. [0003] A large amount of groundwater extraction will cause ground subsidence around the site, deformation of buildings, and environmental degradation of water and soil resources. With the enhancement of the government's awareness of environmental protection in recent years, the awareness of protecting groundwater resources has been continuously strengthened, and a series of measures to limit pumping and discharge have be...

AI Technical Summary

Problems solved by technology

[0008] One is that after the hole is formed, it is necessary to pull out the flushing gun controlled by the crane, then put it into the well point device by the crane, and finally fill the hole with sand, so that the interval between the formation of the well hole and the filling of sand must be relatively long. Long, which will easily cause the soil on the hole wall to collapse, silt or partially silt the filter head of the lower part of the well point device for pumping groundwater, which will directly affect its function of pumping groundwater, thereby seriously affecting the quality of the precipitation project

This kind of condition that affects the quality of the dewatering project due to the collapse of the hole wall due to the long flushing and sinking time is especially serious in the soil conditions of muddy silt and silty fine sand and in the construction of secondary light well point dewatering projects.

[0009] Second, because the flushing guns used for flushing caisson holes are larger in diameter, length and weight than vacuum well point pipes, therefore, the punching operation needs to be operated by a crane, which takes up a large amount of dewatering engineering. Construction costs

[0010] 3. For soft soil layers, especially muddy soil layers, the water outlet effect and survival rate of the vacuum well point pipe are not good, because the water inlet hole of the filter head is often easily blocked by impermeable silt, and a "dead pipe" is formed in severe cases.

[0011] 4. The burial of traditional vacuum wellpoint pipes requires the construction of wellpoint holes in advance. The drainage channel is formed by the coarse sand poured into the soil after the vacuum wellpoint pipes are buried. The construction speed is slow and the cost of materials is high; It is difficult to control the amount of coarse sand poured in, and it is difficult to form a smooth drainage channel, resulting in poor precipitation effect

Since it is necessary to adopt multi-level precipitation to achieve the desired effect, a large amount of equipment and electric power are wasted

[0013] 6. The amount of pumped water outside the foundation pit cannot be controlled, which has a great impact on the external environment of the foundation pit, and it is easy to cause a large-scale reduction of groundwater outside the foundation pit, resulting in uneven settlement of the ground outside the foundation pit, causing a series of environmental and safety problems

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