WO2014175717A1

WO2014175717A1 - Pre-fabricated underground screen for drainage of floodable or oversaturated land

Info

Publication number: WO2014175717A1
Application number: PCT/MX2013/000081
Authority: WO
Inventors: Armando Javier RAMÍREZ RASCON
Original assignee: Ramírez Rascon Armando Javier
Priority date: 2013-04-23
Filing date: 2013-07-04
Publication date: 2014-10-30
Also published as: MX2013004561A

Abstract

The invention is of interest in the fields of agricultural drainage, construction, protection against flooding and contamination of the subsoil, and refilling of aquifers, and especially relates to a pre-fabricated underground screen for drainage of floodable or oversaturated land, consisting of a series of pre-fabricated panels that function as ducts, allowing the clean or contaminated underground water, which is to be drained, to flow through and between same. The panels are assembled by the side edges thereof such that the continuity of the flow between adjacent panels is maintained to the end of the screen, i.e. up to where the drainage takes place via the free edge of the last panel. The panels can be inserted into the subsoil in various ways or combinations thereof: by driving them in, by pressure, vibration, pressurised water jets via the base, etc., or in trenches excavated for this purpose. The screen is designed and constructed for the specific conditions and requirements of each site and the panels that form the screen can be designed so as to monitor both the behavior of the screen and that of the ground in which they are inserted. The panels are installed as retaining walls and are advantageous compared to the slurry wall, as they allow dry excavation.

Description

PREFABRICATED UNDERGROUND SCREEN, FOR LAND DRAINAGE

FLOODABLE OR OVERDURED

BACKGROUND

The usual methods for drainage of flooding or supersaturated soils consist of minor structures for surface runoff, such as ditches and drains, or in trenches and buried pipes, whose realization is usually expensive, delayed and insufficiently deep, and whose operation, frequently ineffective. inefficient, it usually causes internal erosion of the subsoil (see Panuska, J .; The Art Science of Agriculture! Drainage; Natural Resources Extension Specialist Biological Systems Engineering Department UW Madison; January 20, 201 1).

The idea of the drainage screen presented here is one of the results of almost two years of study of the instability of the banks of the Carrizal and Grijalva rivers in the vicinity of the city of Villahermosa, Mexico, where the underground flow and internal erosion causes the soil on river banks to behave like mud. In this regard I gave a lecture at the Institute of Engineering of the National Autonomous University of Mexico, on February 7, 201 3.

This patent application presents the description, claims, summary and drawings of a solution for the efficient drainage of flood or supersaturated land, consisting of the inclusion in the subsoil of a screen formed by prefabricated elements, which can be installed by focused, and that allow the screen to receive, filter, drain and discharge the surface water and groundwater in which it is immersed, in addition to presenting many other advantages that are required in what follows. LIST OF FIGURES

Figure l a. Front of the underground prefabricated underground drainage screen.

Figure I b. Profile of the underground prefabricated underground drainage screen.

Figure 1 c. Top view of the prefabricated underground drainage underground screen.

Figure 2. Cross-section of the schematic operation of the underground screen for a possible case of underground drainage

DESCRIPTION

Of interest in the fields of Agricultural Drainage, Construction, Flood Protection and Subsoil Pollution, Aquifer Recharge, there is a Prefabricated Underground Screen for Flooding of Floods or Overfillings, formed by a series of prefabricated panels , which function as pipelines, allowing water and clean or contaminated water to flow through them and between them, which you want to drain; The panels are assembled together by their lateral edges, so that the continuity of the flow between adjacent panels is maintained until the end of the screen, that is, to where the drain is discharged by the free edge of the last panel.

The panels must be designed and manufactured for the needs of each case, since the trajectory, length and depth of the drain screen result from the series of panels. The panels are housed successively in the subsoil to the depth of design, where they will work partially or totally submerged in the body of groundwater to drain; The proper coupling between successive panels is achieved by pre-installed guides on the side edges of the panels during their manufacture.

The prefabricated panels can be included in the basement in several ways or combinations of them: driving, pressure, vibration, pressurized water jets at the base, etc., or in ditches dug for this purpose.

Although different ways can be devised to capture the underground water inside the panels, that is, inside the screen formed by the series of panels, here a form consisting of a three-layer sandwich is presented: the central one constitutes the duct of drainage and should be more permeable than the ground to drain, the flank layers They function as filters, allowing the passage of water, but not that of soil particles. In order not to impede the hydraulic continuity between adjacent panels, the same material of the drainage pipe or other no less permeable must be placed between the side edges of consecutive panels, for this the trapped soil between the coupling guides must be removed during the insertion of the panels , what can be done with helical augers and / or with a water jet. Also, inside that space between adjacent panels, a tube can be installed that crosses the screen vertically, a tube to which multiple applications could occur, as indicated below.

To protect its integrity during its transfer, lifting and installation, since its manufacture each panel can be inserted within a resistant frame, to whose lateral edges the coupling guides are integrated. In the event that the installation of the panels is carried out by forced inclusion in the subsoil (driving, pressure, vibration, etc.), a sharp and resistant triangular prism can be adhered along the bottom edge of the frame, working as a wedge , facilitate penetration; the inside of said prism can be filled with permeable and filtering material, so that it also functions as a drain. It is suggested that the panels be crossed vertically by tubes firmly integrated to the structural protection frame, which, in addition to protruding from the surface of the land after the panel installation, also shows its interior on the buried surface of the base wedge, thus enabling its use for functions such as:

• Passage of pressurized water jets to facilitate driving,

• Open piezometers during the life of the screen,

• Bottom pumping,

• Guides for inclinometer,

· Routes for the injection of water or other substances,

• Hydration of the subsoil during the drainage, • Rainwater wells,

• Land systems,

• etc.

•

Additionally, "miscellaneous elements" can be included inside the panels such as:

• Ducts for the inclusion of pesticides, herbicides, etc.

• Ventilation ducts,

Ducts to uncover the "filters" by reverse flow,

• Pollutant detectors,

• Electrical terminals to improve the drainage of the ground by electroosmosis,

• Ducts to create vacuum,

• Measuring instruments and equipment such as accelerometers, deformeters, pressure cells, piezometers, thermometers, etc.

• etc.

The dimensions, materials, shapes, arrangements, number and type of elements of each panel, as well as the number of panels required for a screen, will depend on the conditions and characteristics of the specific problem to be solved and the particularities of each case.

The panels for the construction of a screen can be manufactured in a plant or at the installation site, this will depend on several factors, including: o The location and accessibility of the site

o The topography

o The functions that the screen must fulfill o The maximum and minimum hydraulic costs that you want to evacuate with the drain screen

o The required screen depth

o Subsoil contamination

o The chemical composition of groundwater

o The maximum and minimum elevations of the groundwater level o The characteristics and properties of the subsoil

o The permeability of the land

o The weather and weather conditions of the site

o The space available within the installation area

o The dimensions and weight of the panels that will form the screen o The availability of the elements required for the manufacture of the panels

or etc.

In the field of CONSTRUCTION, the screen can be installed to work as a CONTAINING WALL, with the advantage that having drained the ground would allow dry digging, making drainage drilling and digging trenches at the foot of the wall unnecessary.

Among the multiple uses that can be given to the screen presented, the following are mentioned:

• Drainage of agricultural land

• Airports

o Sports facilities (soccer fields, etc.)

• Golf courses

• Residential and industrial fractions

o Landfills

• Flood areas

• Areas where pollutants are processed »Pollutant industries

• Recreational parks

o Shallow or shallow excavations o Construction of foundations

o Construction of Metro lines and Stations

Building foundation drawers

Channels

overpasses

or pump up

docks

or etc.

Usual solutions for drainage:

The drainage of flooded or very saturated lands is usually done by: o surface ditches,

or relatively shallow ditches inside whose perforated or grooved pipes are installed and / or only filled with gravel, boulder or other permeable medium. Sometimes the pipe is lined with some filter tissue to prevent the passage of fine particles and thus prevent internal soil erosion,

or wells from whose bottom the water is extracted by pumping.

Solutions for underground retaining walls:

The so-called Milan Wall is the waterproof containment solution normally used for subsurface excavations, however, this ingenious solution does not solve the problem of drainage of the subsoil and the wall, so it must be designed to withstand not only the pressure of the soil, but also hydrostatic pressure, in addition to requiring additional work to drain the subsoil. On the other hand, the Ilan walls necessarily require the excavation of the ditch where they will be housed.

Claims

one . Surface and / or underground drainage system, consisting of an underground screen formed by a continuous series of prefabricated panels, inserted consecutively in the subsoil, which function as pipelines, allowing clean and ground water to flow through them and between them or contaminated, which is desired to drain, so that the continuity of the flow between adjacent panels is maintained until the end of the screen, that is, to where the drain is discharged by the free edge of the last panel.

2. The drainage screen assembly system referred to in claim 1, consisting of the consecutive insertion of panels assembled by means of coupling guides integrated to the side edges of the panels.

3. Drainage system through a sandwich panel that is formed by a permeable central layer that functions as a drainage doubt, flanked by filter layers that allow the passage of water but that totally or partially prevent the passage of solid particles , according to claim 1.

4. System of a drainage panel according to claims 1 and 2, and a sturdy frame that covers its edges and stiffness and whose lateral edges are integrated guides for coupling with adjacent panels.

5. Procedure of forced insertion in the subsoil of drainage panels by means of driving and / or pressure and / or vibration and / or pressurized water in the base, according to claims 1, 2, and 4.

6. System of protection and facilitation of the forced insertion of panels, by integrating along all the lower edge of the frame referred to in claim 4, of a sharp and resistant triangular prism, which working as a wedge, facilitates penetration on the floor, according to claims 1, 2, 4 and 5.

7. Inclusion system, inside the prefabricated panels and other elements described in claims 1, 2, 4 and 6, of pipes, and / or pipelines, and / or measuring instruments, and / or electrical equipment and / or Part of any of them.

8. Drainage discharge system in a well, all the way up from the last edge of the drainage screen to which claims 1 and 2 refer.

9. Use as a retaining wall of the drain screen referred to in claim 1.

10. Use as a recharge system for aquifers and / or as a way to absorb rainwater, the drainage screen referred to in claims 1 and 2.

eleven . Pumping or pumping battery system, using all or part of the screen referred to in claims 1, 4, 6, 7 and 8.

1 2. Surface drainage system by means of a ditch, filled with permeable, or empty material, hydraulically connected with the element that functions as a drainage duct of an underground drainage screen as referred to in claim 1.