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Water level observation well and construction method thereof

A technology for water level observation wells and construction methods, which is applied in basic structure engineering, on-site foundation soil surveying, construction, etc., can solve problems such as easy leakage and distortion of observation results, and achieve a structure that is not easy to break, low in cost, and accurate in observation results. Effect

Inactive Publication Date: 2012-07-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In some projects, there are examples of using PVC pipes as well pipes for water level observation wells, but the biggest disadvantage of using PVC pipes as water level observation wells is that their outer walls are smooth and easy to leak, which leads to the collusion of various aquifers that the well pipes pass through, making PVC pipes The water level observation well is a mixed water level instead of the water level value of the aquifer in the filter pipe section, resulting in distortion of the observation results

Method used

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  • Water level observation well and construction method thereof
  • Water level observation well and construction method thereof
  • Water level observation well and construction method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The excavation area of ​​a high-rise residential building foundation pit project is 12,300 m 2 , and the depth of the foundation pit is 15.130m. The surrounding of the foundation pit adopts an underground diaphragm wall, the depth of which is 34 meters, and the thickness of the wall is 1.0 meters. The water level observation well of the submerged layer is arranged around the foundation pit, and the structure of the water level observation well is as follows: figure 1 , image 3 with Figure 4 shown.

[0033] The top-to-bottom vertical distribution of strata within the excavation depth range of the foundation pit is:

[0034] ①Artificial fill and miscellaneous fill, thickness 2.3m ;

[0035] ② Silty clay, thickness 5.1m;

[0036] ③ Silt, thickness 11.4m ;

[0037] ④ Silty clay, thickness 5.7m ;

[0038] ⑤silt, thickness 9.80m ;

[0039] ⑥silt, thickness 8.10m ;

[0040] ⑦silty clay, thickness 14.5m ;

[0041] ⑧silt, thickness 16.30m .

[0042] The abov...

Embodiment 2

[0046] The excavation project of a subway tunnel is 260m long, 20.5m wide, and the excavation depth is 15.420m. An underground continuous wall is adopted around the foundation pit, the ground connection wall is 35 meters deep and the wall thickness is 1.2 meters. Water level observation wells for aquifers and confined aquifers are arranged around the foundation pit, see Figure 1 ~ Figure 4 .

[0047] The top-to-bottom vertical distribution of strata within the excavation depth range of the foundation pit is:

[0048] ①Artificial fill and miscellaneous fill, thickness 3.4m ;

[0049]② Silt, thickness 12.1m ;

[0050] ③ Silty clay, thickness 3.6m;

[0051] ④ Silt, thickness 2.5m;

[0052] ⑤silt, thickness 10.0m ;

[0053] ⑥silty clay, thickness 12.5m ;

[0054] ⑦silt, thickness 10.3m ;

[0055] ⑧silt, thickness 5.4m .

[0056] The water level observation well in the aquifer uses PVC pipes. The nominal outer diameter of the PVC pipe section is 90mm, the thickness ...

Embodiment 3

[0062] The foundation pit project of a subway station is 463m long, 19.35m wide, and 18.590m deep. An underground continuous wall is adopted around the foundation pit, the depth of the ground connection wall is 38 meters, and the wall thickness is 1.2 meters. Water level observation wells for aquifers and confined aquifers are arranged around the foundation pit, see Figure 1 ~ Figure 4 .

[0063] The top-to-bottom vertical distribution of strata within the excavation depth range of the foundation pit is:

[0064] ①Artificial fill and miscellaneous fill, thickness 4.50m;

[0065] ② Silt, thickness 13.00m;

[0066] ③ Silty clay, thickness 4.0m;

[0067] ④ Silt, thickness 2.80m;

[0068] ⑤silt, thickness 13.10m;

[0069] ⑥Silly clay with a thickness of 21.5m.

[0070] The water level observation well in the aquifer uses PVC pipes. The nominal outer diameter of the PVC pipe section is 200mm, the thickness is 3.9mm, the total pipe length is 10m, the first pipe section is 6m...

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Abstract

The invention discloses a water level observation well. The well pipe of the well is a PVC pipe, wherein the pipe sections of the PVC pipe are connected by threaded sleeves; the water filtration part of the well pipe is provided with a water outlet; the outer wall of the PVC pipe is fixedly connected with a coarsely-textured fabric layer which is fully adhered with a cement mortar layer; and the water outlet runs through the coarsely-textured fabric layer, the cement mortar layer and the PVC pipe. The invention also discloses a construction method of the water level observation pipe. The method for manufacturing the pipe sections of the well pipe of the well comprises: a, connecting the coarsely-textured fabric layer with the outer walls of the PVC pipe sections and the threaded sleeves respectively; b, fully adhering the cement mortar layer on the coarsely-textured fabric layer to form the pipe sections of the well pipe; and c, before the final setting of the cement mortar layer, drilling the water outlet on the pipe section, at the water filtration position, of the well pipe, wherein the water outlet runs through the coarsely-textured fabric layer, the cement mortar layer and the PVC pipe. The water level observation well has the advantage of accurate observation result and the construction method has the advantage of low construction cost.

Description

technical field [0001] The invention relates to the field of engineering monitoring, in particular to a water level observation well and a construction method thereof. Background technique [0002] Groundwater level monitoring is often required in engineering monitoring of civil and water conservancy projects, and steel pipes or concrete sandstone filter pipes are commonly used in current water level observation wells. [0003] The construction process of using steel pipe or concrete sandstone filter pipe to make a water level observation well includes the following steps: measuring and releasing the well position, burying the mouth protection pipe, installing the drilling rig, drilling into the hole, clearing the hole and changing the slurry, running the well pipe, filling gravel, filling Clay balls, filling clay around the well pipe, sealing the wellhead, washing the well, installing the pump and testing, draining, backfilling or sealing the well. The purpose of gravel fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/00E21B47/047
Inventor 杨建民郑刚
Owner TIANJIN UNIV
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