TEMPORARY DRAINAGE WELLS IN LOOSE GRANULAR SOILS

• US 20160186398A1
• Filed: 03/04/2016
• Published: 06/30/2016
• Est. Priority Date: 03/04/2015
• Status: Active Grant

• Current Assignee: Bahman Niroumand
• Original Assignee: Bahman Niroumand
• Inventors: Niroumand, Bahman
• Granted Patent: US 9,840,835 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: E02D 1/00 Investigation of foundation soil in situ investigation involving boring or specially adapted to earth drilling E21B25/00, E21B49/00; investigating or analysing materials by determining their chemical or physical properties, in general G01N, e.g. sampling G01N1/00
• CPC Class Codes: E02D 3/10 by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains E02D3/11 takes precedence; soil-penetrating vibrators with auxiliary watering E02D3/054; drainage of soil in general E02B11/00
• CPC Class Codes: E03F 1/002 with disposal into the ground, e.g. via dry wells

Abstract

A method for building a drainage well in a loose granular soil is disclosed. The method includes inserting a liner tube into a loose soil using an inserting device. The liner tube includes a housing and an internal shaft placed inside the housing and coupled to inside the housing via a locking mechanism. Subsequent to insertion into the soil, the internal shaft is unlocked from the housing and removed therefrom. Thereafter, a grooved pipe is inserted inside the housing using the inserting device. Subsequent to the grooved pipe insertion into the housing, the housing is removed from the loose granular soil using a mechanical excavator and a space between the loose granular soil and the grooved pipe is filled with a filling material.

Claims

1. A method for building a drainage well in a loose granular soil, the method comprising:

inserting a liner tube into a loose soil using an inserting device, the liner tube including a housing and an internal shaft placed inside the housing and coupled to inside the housing via a locking mechanism;

unlocking the internal shaft from the housing and removing the unlocked internal shaft from the housing subsequent to inserting the liner tube into the loose soil;

inserting via an inserting device a grooved pipe inside the housing from which the internal shaft has been removed, the grooved pipe being longer than the housing and configured to receive groundwater via a plurality of grooves within the grooved pipe;

removing via a mechanical excavator the housing from the loose granular soil subsequent to insertion of the grooved pipe inside the housing; and

filling a space between the loose granular soil and the grooved pipe with a filling material.

2. The method of claim 1, wherein the inserting device includes a mechanical hammer for hammering the liner tube into the loose granular soil and the liner tube includes a cone shaped end, the method further comprising:

inserting a drainage pipe inside the grooved pipe; and

connecting the drainage pipe to a pump to remove the groundwater penetrated inside the grooved pipe.

3. The method of claim 1, wherein the removing the unlocked internal shaft includes removing the unlocked internal shaft using the mechanical excavator.

4. The method of claim 1, wherein the inserting device includes a hydraulic hammer, a mechanical auger, or a compressed air hammer.

5. The method of claim 2, wherein the cone shaped end of the liner tube is part of the internal shaft and is configured to facilitate penetration of the liner tube into the loose soil.

6. The method of claim 1, wherein the filling material includes sand, the method further comprising filling up to 50 centimeters from bottom of the grooved pipe with sand to stabilize the grooved pipe inside the liner tube.

7. The method of claim 1, wherein the drainage well is about 7 meters deep and about 50 centimeters wide.

8. The method of claim 1, wherein a top part and a bottom part of the liner tube are covered with hard steel plates to increase the liner tube strength.

9. The method of claim 1, wherein inserting the liner tube in the soil is performed without soil removal, and wherein the liner tube compresses the loose soil when entering the soil.

10. The method of claim 9, wherein the compressed soil around the liner tube prevents occurrence of piping phenomena.

11. The method of claim 1, wherein:

the inserting device includes a mechanical hammer, and

inserting the line tube includes inserting the line tube into the soil using a flat disk attached to the mechanical hammer.

12. The method of claim 11, wherein the liner tube is connected to the mechanical hammer via steel cables.

13. The method of claim 1, wherein the grooved pipe is made from hard plastic, hard polymer, polyethylene, polyvinyl chloride (PVC), or hard un-plasticized polyvinyl chloride (UPVC).

14. The method of claim 1, further comprising wrapping the grooved pipe with a geotextile layer configured to protect the grooved pipe and filter the groundwater penetrating the grooved pipe.

15. A method for draining groundwater from an area having loose granular soil, the method comprising:

creating a plurality of drainage wells in the area of the loose granular soil, wherein the drainage wells have a predefined distance from each other and creating each drainage well includes;

hammering a liner tube with a cone shaped end into the loose soil using a mechanical hammer, the liner tube including a housing and an internal shaft placed inside the housing and fixed to the housing using a locking mechanism;

unlocking the internal shaft from the housing and removing the unlocked internal shaft from inside the housing subsequent to hammering the liner tube into the loose soil;

inserting a grooved pipe inside the housing by hammering the grooved pipe using the mechanical hammer, wherein the grooved pipe is longer than the housing and is configured to receive groundwater via a plurality of grooves within the grooved pipe;

filling bottom of the grooved pipe with sand to stabilize the grooved pipe inside the housing;

removing the housing from the loose granular soil using a mechanical excavator, and

filling a space created by the removing of the housing with a filling material;

inserting a drainage pipe inside the grooved pipe of each drainage well from the plurality of drainage wells; and

connecting the drainage pipes from the plurality of drainage wells to a pump configured to remove the groundwater penetrated inside the grooved pipes of the plurality of drainage wells.

16. The method of claim 15, wherein the removing of the unlocked internal shaft is performed using the mechanical excavator.

17. The method of claim 15, wherein the mechanical hammer is a hydraulic hammer.

18. The method of claim 15, wherein the cone shaped end of the liner tube is connected to the internal shaft.

19. The method of claim 15, wherein hammering the liner tube in the soil is performed without soil removal, and wherein the liner tube compresses the loose soil when entering the soil.

20. The method of claim 15, wherein the liner tube is connected to the mechanical hammer via steel cables.