WO2013144517A1

WO2013144517A1 - System for protecting a floor against climate hazards and outdoor sports area provided with such a system, and method for protecting a floor against climate hazards

Info

Publication number: WO2013144517A1
Application number: PCT/FR2013/050683
Authority: WO
Inventors: Pierre Marc Gabriel TAVERNIER
Original assignee: Parcs Et Sports
Priority date: 2012-03-28
Filing date: 2013-03-28
Publication date: 2013-10-03
Also published as: FR2988740B1; FR2988740A1

Abstract

The invention concerns a system for protecting a floor (1) against climate hazards, said floor forming, at the surface, a natural or synthetic non-sealed area (2), in particular an outdoor sports area, said system comprising, incorporated into the thickness of the ground: - a heating means (4) installed to dissipate the heat in the ground (1) from a depth H so as to ensure the ground (1) is heated over substantially the entirety of the area (2), - a ventilation means (5) installed at a depth greater than depth H so as to produce a ventilation flow (6) in the thickness of the ground (1), said heating means (4), said ventilation means (5) and the structure of the ground (1) being such that the ventilation flow (6) ensures the dissipation and distribution of the heat through the thickness of the ground (1) to ensure the area is heated (2). System and method for protecting sports areas.

Description

SOIL PROTECTION SYSTEM FOR CLIMATIC HAZARDS AND OUTDOOR SPORTS AREA EQUIPPED WITH SUCH A SYSTEM, AND METHOD OF PROTECTING SOIL AGAINST CLIMATIC HAZARDS

TECHNICAL FIELD The present invention relates to the general technical field of systems and methods for protecting soils against climatic hazards, and in particular to the systems and methods for protecting outdoor sports areas, such as sports fields, football courts or sports courts. such as protection systems and methods aimed at controlling the climatic hazards (mainly rain, snow, temperature) which disturb the normal use of these playgrounds, mainly in winter, and / or interfere with the maintenance and plant development.

The invention relates to a system and method for protecting a soil against climatic hazards and an outdoor sports area equipped with a system for protecting a soil against climatic hazards. Outdoor sports areas, and especially outdoor sports fields such as football stadiums and rugby stadiums, are particularly vulnerable to winter weather conditions, especially as the general configuration of these stadiums, particularly proximity and the large size of the tribunes, harms the maintenance and good regeneration of the lawns that equip these sports fields. It proves extremely difficult to overcome the often brutal variations that occur in natural climatic conditions (temperature, pressure, hygrometry, wind, etc.) which disturb not only the use and availability of sport (unavailability in case of frost, snow or heavy rain), but still affect the maintenance and sustainability of plants and soil forming sports areas especially as the conditions of environment and construction of sports fields in the open air accentuate the harmful effects of climatic hazards.

B130695 PCT PRIOR ART

To date, several techniques and systems for the protection of outdoor sports fields have already been known, these techniques being aimed mainly at trying to overcome the harmful effects generated by the very low winter temperatures which, if no corrective action is taken, , lead to the freezing of the ground and make it impracticable while leading to a bad exploitation of the turf.

Thus we already know first and foremost the techniques of protecting sports fields in winter with a tarpaulin under which we breathe pulsed air to create a turf protection environment. This technique gives interesting results and can help limit the appearance and effects of freezing sports fields under certain conditions. Nevertheless, this technique suffers from various disadvantages and is initially difficult to implement because of the difficulties of handling tarpaulins whose weight and size are barriers to their use. Moreover, this technique requires a high thermal energy, especially in periods of extreme cold, so that these techniques are not considered to be of good economic interest. These techniques, in order to be implemented, also require constant movement on the lawn in winter with different materials which inevitably causes a series of settlements and degradation of the lawn while the plants are precisely in situations and general conditions of weakness since their growth activity is non-existent in winter. Finally, the need to use a tarpaulin protection of the lawn and ensure a rapid blowing of air, create environmental conditions particularly harmful for the life of plants whose trade, especially gaseous, with the outside are strongly disturbed and lead to the occurrence of asphyxiation and death of plants.

It is also already known to ensure in winter the ventilation of sports fields using a ventilation system by the ground. This system makes it possible to improve the conditions of sports fields in the event of very high rainfall by promoting the evaporation of water. However, a te! system is limited and insufficient when

B130695 PCT the appearance of very low temperatures because it then requires the permanent implementation of the ventilation system which very quickly causes a very strong drying of the soil and its substrate without providing a fully effective solution against the gei of the ground. This obviously leads very quickly to affect the quality and the good behavior of the turf.

Finally, we know last the soil heating techniques by incorporating electric heating cords or a heated hydraulic floor in the soil itself and at a reference depth. This technique gives interesting results, especially for the frost prevention of sports fields, but is nevertheless of limited use and still high cost. This technique does not ensure optimal management of turf maintenance and growth.

Soils protection systems and methods against climatic hazards, in particular soils forming on the surface a natural or non-watertight synthetic area, in particular outdoor sports areas, therefore need to be improved as the requirements users of such sports surfaces are growing. It is indeed more and more common to require the maintenance of a sports field and its lawn in a perfect condition throughout the year regardless of the natural weather conditions it undergoes.

The traditional aeration techniques applied now to try to keep the lawns of the sports stadiums in perfect condition are few and are usually limited to the repeated passage of mechanical aeration tools ensuring the perforation of the soil in order to accelerate its aeration by reinforcing the penetration of the air in the root zones. These techniques are limited in practice, and require many materials, manpower and must be repeated several times throughout the year so that these techniques are definitively a price. high return.

Finally, these techniques require constant movement on the lawn and in particular during periods when the grass is no longer in growth phase, that is to say during the periods when it is the most fragile and sensitive.

B130695 PCT Finally, and in general, it is known that closed enclosures that are sports stadiums lead to the appearance of climatic phenomena preventing the good behavior of the grass throughout the year, climatic phenomena that should be controlled at best to ensure the good behavior of the grass. The climatic phenomena involved are for example:

- rain that makes play surfaces often impassable,

- the frost which affects the structure of the self and prevents, if no corrective action is taken, the sporting use of the frozen ground,

- the snow, which also makes the terrain impassable as soon as the snowpack reaches a thick consistency and thickness,

- and finally the air since the lack of ventilation in the stages resulting from their semi-closed structure, or even completely closed for some, leads to a disappearance of the turf, especially during the winter period because of the reduction of the gas exchanges soil / atmosphere. SUMMARY OF THE INVENTION

The objects assigned to the invention therefore aim to remedy the various disadvantages mentioned above and to propose a new system and a new method of protection against the climatic hazards of a soil forming on the surface a natural or synthetic non-watertight a kind of grassed outdoor sports area that allows to control and regulate the harmful influence of climatic hazards on the operating conditions of said soils while preserving the structure of said soils and the plants they support.

Another object of the invention is to propose a new system and a new protection method that is particularly simple to implement while being robust and efficient.

Another object of the invention is to propose a new system and a new protection method that is particularly versatile in its use and operation by being able to adapt to different climatic conditions while allowing particularly economical operation.

B130695 / PCT Another object of the invention is to propose a new system and a new protection method which is particularly effective and which ensures the sustainability of the soil throughout the year.

The objects assigned to the invention are achieved by means of a system for protecting a soil against climatic hazards, said ground forming on the surface a natural or synthetic non-watertight area, in particular an outdoor sports area. , said system comprising integrated in the soil thickness:

a heating means set up to dissipate heat in the soil from a depth H so as to ensure the heating of the soil over substantially the entire area,

- ventilation means placed at a depth greater than the depth H so as to produce a ventilation flow in the soil thickness, said heating means, said ventilation means and the soil structure being such that the flow Ventilation ensures the dissipation and distribution of heat through the thickness of the soil to ensure the heating of the area.

The objects assigned to the invention are also achieved with the aid of an outdoor sports area equipped with a system according to the invention.

The objects assigned to the invention are also achieved by means of a method of protecting a soil against climatic hazards, said ground forming on the surface a natural or synthetic non-watertight area, in particular a sports area of full air, in which:

a heating flow is emitted through the thickness of the soil from a depth H,

the dissipation and distribution of this heating flow is ensured to the surface by creating a ventilation flow generated at a depth greater than the depth H.

B130695 / PCT The objects assigned to the invention are also achieved by means of a method of protecting a soil against climatic hazards, said ground forming on the surface a natural or synthetic non-watertight area, in particular a sports area of full air, in which: - the dissipation and distribution of a ventilation flow through the thickness of the soil is ensured to the surface by creating a flow of ventilation emitted into and through the soil.

- drainage of runoff water present on the surface by creating a suction flow emitted into the soil and through it,

BRIEF DESCRIPTION OF THE DRAWINGS Other particularities and advantages of the invention will appear and will appear in more detail from a reading of the description given below, with reference to the appended drawings, given solely by way of illustrative and nonlimiting examples, in which :

- Figure 1 illustrates, in a partial longitudinal cross-sectional view a preferred example of a protection system of a so! according to the invention, in this case a floor of an outdoor sports area, the kind of football field with a turf surface.

BEST MANNER OF REALIZING THE INVENTION

The invention relates to a system for protecting a floor 1 against climatic hazards, said floor 1 as illustrated in FIG. 1, the upper part or layer 2A of which forms on the surface a natural or non-leakproof synthetic area 2, in particular an outdoor sports area.

B130695 / PCT As illustrated in FIG. 1, the surface layer 2A may be formed, preferably, by a lawn or turf a few centimeters thick made of, for example, a mixture of grasses of various species with a root system developing in the surface layer 2A of suitable soil and a few centimeters thick. The surface layer 2A is for example of an average thickness of the order of 1 to 10 cm, and preferably 1 to 4 cm.

Conventionally, the natural or non-waterproof synthetic area 2 intended to be protected by the protection system according to the invention will have a surface corresponding to the usual norms of outdoor sports grounds and will correspond for example to the standardized surfaces of the courts. football or rugby whose width is for example between 45 and 90 meters and the length between 90 and 120 meters. The protection system according to the invention will obviously be adapted to these dimensions and all its constituent elements will be dimensioned accordingly. The soil protection system according to the invention may also be put in place to protect soils of a nature other than those intended specifically and directly to form a common area qualified area of outdoor sports area, but can be used to protect all types of soils that need to be frost-free or out of water and without waterproof coatings. For this purpose and by way of non-limiting examples, the soil protection system according to the invention may be used to protect stabilized or grassed parking floors, equestrian quarries, racetracks or all types of areas. various games as defined above.

According to the invention, the system for protecting a floor 1 against climatic hazards is designed to ensure the protection of a floor 1 forming on the surface a natural or non-waterproof synthetic area 2, in particular an outdoor sports area. and he understands, integrated in the thickness of the ground:

a heating means 4 set up to dissipate heat in the ground 1 from a depth H so as to ensure the heating of the ground 1 over substantially the entire area 2,

B130695 / PCT a ventilation means 5 placed at a depth greater than the depth H so as to produce a ventilation flow 6 in the thickness of the floor 1, said heating means 4, said ventilation means 5 and the structure of the floor 1 being such that the ventilation flow 6 ensures the dissipation and distribution of the heat supplied by the heating means 4 through the thickness of the floor 1 to provide heating of the air 2.

The protection system according to the invention thus allows the ventilation flow 6 which is generated to a depth greater than that of the heat flow, to propagate through the soil structure and in particular due to its natural porosity in the direction of the surface. , that is to say in the direction of Taire 2 and the surface layer 2A to ensure the dissipation of the heat flow produced by heating means 4 scattered and distributed over the entire surface of the area 2.

The ventilation flow 6 also makes it possible to decompact and oxygenate the structure of the soil 1. Advantageously, the structure of the soil 1 may comprise from the surface layer 2A and immediately below the latter, a first layer 8 formed by a grass mixture with a substrate adapted to the circulation of a fluid and of various particle size and for example a Terrafoot®-type substrate (registered trademark) based on a mixture of pouzolane, clinker and various fertilizers on a thickness of the order of 17 cm for example, the thickness of the surface layer 2A being included.

The immediately lower layer 9 which is for example of a thickness of about 13 cm may advantageously consist of a draining layer having a certain mechanical strength allowing both the passage of water, the creation of a certain porosity conducive to the passage and dissipation of fluids but still providing some mechanical resistance "to settlements in particular.

B130695 PCT As illustrated in FIG. 1, the heating means 4 in accordance with the invention is placed substantially at the lower level of the layer 9 which thus defines the depth H which is in a nonlimiting manner and purely informative of the order of 20 cm for example. As illustrated, the heating means 4 is formed by a network of tubular or filamentary elements 4 buried and spaced apart from each other, for example of the order of 30 cm, in a serpentine or other path so as to be distributed substantially covering at least area 2.

According to a first variant embodiment, the heating means 4 is formed by a network of heating electric cables buried substantially at the depth H, at the bottom of the draining layer 9, the electric heating cables being of a section and a power sufficient to provide floor heating in case of frost without risking damaging the turf root system. Nevertheless, other types of implantations are possible for electric heating cables, within the meaning of the invention.

The electric heating cables will therefore be formed of heating cords so as to constitute a network of electrical cables, for example 400 volts, low voltage or very low voltage posed at regular intervals above the level of the ventilation means 5 and connected to an electric power source (not shown) located in the vicinity of the outdoor sports area in a technical room (not shown in the figures).

In a manner well known to those skilled in the art, the electric heating cables will be distributed for example in coils so as to ensure the heating of the entire area 2. Alternatively, the heating means 4 may be formed by a network of heating tubes inside which circulates a hot fluid. According to this variant, the heating pipe array is disposed in the same way and at the same locations and at the same depth H as the electric heating cables.

B130695 / PCT According to a particularly advantageous variant of the invention, the heating tubes will be formed by polyethylene tubes, the heating fluid being hot water circulating inside the polyethylene tubes being driven for example by a conventional pump. Thus, according to the invention, the heating means 4 form a heating floor which can be advantageously controlled by a series of temperature probes 11 buried at different depths under the area 2, the entire system being driven in a computer manner.

According to the invention, the ventilation means 5 is formed by a network of pipes 12 buried in the foundation layers of the ground 1 and comprising drains 13 which ensure the emission of the ventilation flow to the outside through their perforations or micro perforations. According to the invention, the pipe network 12 is thus buried under the heating means 4 at a depth which is therefore greater than the depth H so as to ensure the dissipation and the distribution of heat emitted by the heating means 4 to through the so! using in particular the conduction of the soil, its porosity and its humidity.

According to the invention, the pipe network 12 is formed by a primary network 14 connected to at least one ventilation element 15, said primary network 14 supplying a secondary network formed of the drains 13. According to the invention, the ventilation means 5 is therefore formed by a first primary network, called nanny 14, consisting of large diameter pipes for example between 600 and 400 mm, the primary network being buried preferably under the secondary network formed by the drains 13 so as to feed these latter. The secondary network of drains 13 is generally composed of drains of smaller diameter, for example between 160 and 200 mm, the drains 13 being tubes conventionally used to perform the drainage functions of the floors and thus being provided with perforations allowing them to distribute in the soil the ventilation flow 6 generated by the operation of the ventilation element 15 which produces a flow F.

B130695 PCT According to the invention, the ventilation element 15 will advantageously be a double-flow ventilation element so as to be able alternately to create a ventilation flow 6 or conversely to create a suction flow through the drains 13. According to this characteristic, the The suction flow created therefore has a direction opposite to that of the ventilation flow 6 and therefore has the primary function of ensuring the suction of surface water possibly present in the area 2.

According to another characteristic of the invention, the ventilation means 5 may be provided with a preheating unit (not shown in the figures) to enable a ventilation flow 6 to be generated which is preheated to a temperature greater than 0 ° C. and preferably between 1 and 10 ° C, and even more preferably of the order of 5 ° C.

This arrangement makes it possible in fact to emit, in winter in particular, air preheated to 5 ° C. so as to substantially accelerate the heating effect without, however, generating a harmful thermal shock to the plants. Preheating of the air may be provided by any means well known to those skilled in the art, and for example by a series of electric batteries or heat pumps, the entire system may be under computer control.

The buried pipe network 12 and in particular the primary network 14 is connected to a drainage water recovery unit 20 recovered by the piping network 12, said unit 20 comprising one or more separation chambers allowing the separator to be separated. air and collect drainage water to direct it to conventional stormwater drainage systems.

The system according to the invention may also include moisture probes 22 buried in the ground and distributed uniformly to different thicknesses to ensure, in connection with the computer system, an optimized control of the ventilation in conjunction with the temperature sensors 11.

In a particularly interesting way, the system according to the invention will include humidifiers (not shown in the figures) buried in the ground. Humidifiers

B130695 PCT allow in fact to keep in the soil an optimal moisture assuring the good behavior and the good growth of the turf, which avoids having to ensure the ventilation of too dry air particularly harmful to the plants.

Finally, the system according to the invention comprises a central control unit provided with computer means functionally connected to the heating means 4, to the ventilation means 5 and to the temperature and humidity probes 11, as well as to the humidifiers to ensure Automated and computerized management of the entire system.

The invention also relates to an outdoor sports area equipped with a system according to the invention.

The outdoor sports area according to the invention consists of a synthetic or natural lawn of a sports field, for example a football or rugby field.

The invention also relates to a method of protecting a soil against climatic hazards, said ground forming on the surface a natural or unsealed synthetic area, in particular an outdoor sports area, in which:

- a heating flow is emitted through the soil thickness from a depth H _!

the dissipation and distribution of this heating flow is ensured to the surface by the creation of a ventilation flow generated at a depth greater than the depth H.

According to a preferred variant of the invention, the ventilation flow is air emitted by a buried pipe network 12, 13, 14 including drains 13 and from them.

Indeed, according to the invention, it is the drain network 13 which is located closest to the heating means 4 which ensures the emission of a ventilation flow responsible for ensuring the distribution, transport and dissipation the heat emitted by the heating means 4 through the thickness of the ground 1 to its surface.

B130695 / PCT As illustrated in the figures, the drains 13 will advantageously be placed in a volume of draining materials, for example crushed or rolled gravel placed in trenches dug at a level immediately below the depth H. This arrangement ensures the protection against settlement of the drains 13 and forms a porous substrate promoting the dissipation of the ventilation flow to the draining layer 9 from which the heat is emitted.

According to the method of the invention, and preferentially, the ventilation stream 6 is preheated to a temperature above 0 ° C., and preferably at a temperature in the region of 5 ° C. The invention also relates, and as a variant, to a method of protecting a soil against climatic hazards, said soil forming at the surface a natural or synthetic non-watertight area, and forming in particular an outdoor sports area, the method being such that:

- Dissipation and distribution of a ventilation flow through the thickness of the soil to the surface is ensured by the creation of a flow of ventilation emitted into the soil and through it.

According to this method, it is indeed possible to ensure the dissipation and distribution of a single flow of ventilation without having to use the heating means 4, which is then inactivated, the flow of ventilation being emitted from the drains 13 Such a mode of operation makes it possible to use the ventilation alone, except for the heating mode, to ventilate the ground during summer periods, for example, outside periods of frost or snow. According to this mode of operation, the air flows are of the order of about 10 m ³ / sec.

According to this method, the ventilation flow is at ambient temperature and is emitted into the soil and through its thickness from a buried pipe network 12, 13, 14 comprising drains 13 and from these.

B130695 / PCT Finally, the invention relates to a method of protecting a soil against climatic hazards, said ground forming a surface area natural or synthetic unsealed, and forming in particular an outdoor sports area, method according to which:

- Drainage water runoff present on the surface 2 by ensuring a suction flow emitted into the soil 1 and through the latter.

This method makes it possible to ensure the drainage of runoff water present on the surface 2 by suction by using the suction created by the fans 15 through the drains 13.

According to this method, the suction flow is emitted into the soil 1 and through its thickness from a network of pipes 12, 13, 14 buried, said network of pipes comprising drains 13, the suction being carried out at from these.

According to this method, the runoff water is discharged from the drains 13 via the manholes 20 connected to the network of pipes 12, 13, 14, said buried pipes being connected to the rainwater network.

Finally, according to this method, the suction flow is generated by a suction unit, comprising the ventilation element or elements 15, which have an air flow rate of between 2 and 10 m ³ / second, for example, preferably of the order of 5 m ³ / sec.

The device and the soil protection method against climatic hazards corresponding to the invention thus make it possible to benefit at the same time from the advantages resulting from the creation of a ventilation flow and at the same time from the emission of a flow of integrated heating.

The combination of these two elements makes it possible to obtain both a good oxygenation through the thickness of the self, and a good distribution of heat through the effect of ventilation, while accelerating the drainage of the ground by suction by reversing the ventilation.

B130695 PCT A peculiarity of the invention therefore makes it possible to ensure the pairing of two technologies and to lead to an original operation allowing both the setting frost and off snow of a soil and at the same time its drainage thanks to the possibility to reverse its operating mode and or to inactivate the heating means 4 to keep only the emission of a ventilation flow in hot climatic period.

Ultimately, the system and methods according to the invention allow a complete control of the various climatic hazards likely to occur and ultimately ensure the sustainability of the grass throughout the year.

POSSIBILITY OF INDUSTRIAL APPLICATION

The invention finds its industrial application in the establishment of soil protection systems against climatic hazards and in the implementation of methods of protecting the soil against climatic hazards.

B130695 PCT

Claims

A system for protecting a soil (1) against climatic hazards, said ground forming on the surface a non-watertight natural or synthetic area (2), in particular an outdoor sports area, said system comprising integrated in the thickness of the ground :

- heating means (4) arranged to dissipate heat in the soil (1) from a depth H so as to ensure the heating of the soil (1) over substantially the entire area (2 )

- ventilation means (5) placed at a depth greater than the depth H so as to produce a ventilation flow (6) in the soil thickness (1),

said heating means (4), said ventilation means (5) and the soil structure (1) being such that the ventilation flow (6) ensures the dissipation and distribution of heat through the soil thickness (1). ) for heating the area (2).

System according to claim 1 characterized in that the ventilation means (5) is formed by a network of pipes (12) buried in the soil foundation layers (1) and having drains (13).

System according to claim 2 characterized in that the pipe network (2) is formed by a primary network (14) connected to at least one ventilation element, said primary network supplying a secondary network formed by the drains (13).

System according to claim 3 characterized in that said at least one ventilation element is double flow so as to alternately create a ventilation flow (6) or create a suction flow through the drains (13).

B130695 PCT System according to one of the preceding claims, characterized in that the ventilation means (5) is provided with a preheating unit for generating a preheated ventilation flow (6) at a temperature above 0 ° C, and preferably between 1 and 10 ° C, and even more preferably of the order of 5 ° C.

6 - System according to one of claims 2 to 5 characterized in that the pipe network (12) is connected to a drain water recovery unit (20) recovered by the pipe network (12), said unit comprising separating eyes. 7- System according to one of claims 1 to 6 characterized in that the heating means (4) is formed by a network of buried tubular or filamentary elements

8 - System according to one of claims 1 to 7 characterized in that the heating means (4) is formed by a network of buried electric heating cables. 9 - System according to claim s characterized in that the heating electric cables are buried at the bottom of the draining layer (9).

10 -System according to one of claims 1 to 7 characterized in that the heating means (4) is formed by a network of heating tubes inside which circulates a hot fluid. 11- System according to claim 10 characterized in that the network of heating tubes is formed by polyethylene tubes and in that the heating fluid is water.

12- System according to one of the preceding claims characterized in that it comprises temperature probes (11) and humidity (22) buried in the ground (1).

13- System according to one of the preceding claims characterized in that it comprises humidifiers buried in the ground (1).

B130695 / PCT 14- System according to one of the preceding claims characterized in that it comprises a central control unit provided with computer means operatively connected to the heating means (4), the ventilation means (5) and the temperature probes (11). ) and humidity (22) and humidifiers for automated system management.

15- outdoor sports area equipped with a system according to one of claims 1 to 14.

16- outdoor sports area according to claim 15 characterized in that it is constituted by a synthetic or natural lawn sports field, for example football or rugby.

17- Method of protecting a soil (1) against climatic hazards, said ground forming on the surface a non-waterproof natural or synthetic area (2), in particular an outdoor sports area, in which:

a heating flow is emitted through the thickness of the ground (1) from a depth H,

the dissipation and distribution of this heating flow is ensured to the surface by the creation of a ventilation flow (6) generated at a depth greater than the depth H.

18- Method according to claim 17 characterized in that the ventilation flow (6) is air emitted by a network of pipelines (12) buried including drains (3) and from them.

19- Method according to one of claims 17 or 18 characterized in that preheating the ventilation stream (6) at a temperature above 0 ° C, preferably at a temperature of 5 ° C.

B13Û695 / PCT A method of protecting a soil (1) against climatic hazards, said ground forming on the surface a non-watertight natural or synthetic area (2), in particular an outdoor sports area, in which:

- By inactivating a heating means located at a depth H ensures the dissipation and distribution of a single flow of ventilation (6) through the thickness of the soil (1) to the surface by creating a ventilation flow (6) emitted from a depth greater than the depth H in the soil (1) and through it.

Method according to claim 20, characterized in that the ventilation flow (6) is at ambient temperature and is emitted into the soil (1) and through its thickness from a network of buried pipes (12) comprising drains ( 13), the ventilation flow (6) being emitted from them.

A method of protecting a soil (1) against climatic hazards, said ground forming on the surface a non-watertight natural or synthetic area (2), in particular an outdoor sports area, in which:

- Drainage of runoff water present on the surface is ensured by creating a suction fiow emitted into the soil (1) and through the latter, from a network of buried pipes (12) comprising drains (13), the ventilation flow (6) being emitted from them, characterized in that discharges the runoff from the drains (13) via manholes connected to the network of pipes (12). ) buried and to the rainwater network.

Method according to Claim 22, characterized in that the suction flow is generated by a suction unit with an air flow rate of between 2 and 10 m ³ / sec, preferably of the order of 5 m ³ / sec. .

B130695 PCT