BUILDING METHOD AND BUILDINGS

Abstract

A method and designs of underground buildings for any purpose that do not introduce any element above ground level, thus allow agricultural use of the land by any agricultural machine or technology or using the land for recreational park.

Description

FIELD OF THE INVENTION

The present invention relates to better use of land and specifically to underground building occupied by humans where the top ground serve for agricultural purposes or recreational parks.

BACKGROUND OF THE INVENTION

As world population continues to grow there is a continuous demand for land for housing, offices, industry, agriculture, amuse park and recreational green parks. When human civilization invented agriculture, permanent location inhabitation started where there were lands suitable for agricultural crops. As villages developed into cities, this development came on the expense of fine land highly suitable for agriculture. Today, there are many cities, which are congested with concrete building and far less than desired green areas within the city. Further, continuous demand for new offices building and malls near the cities threaten to diminish the reserves of good land for agricultural use. This causes the authorities to become reluctant to approve new building projects on agricultural land. However, there are positive aspects to build new office buildings, shopping centers, apartment buildings and light industry near existing cities as this can save travel time, air pollution and money to commuters from city to near destinations rather than far destinations.

Therefore there is a need for innovative technology that will enable dual use of agricultural land so new building can be built without losing agricultural land.

SUMMARY OF THE INVENTION

According to the present invention, there is provided a method and designs of underground buildings for any purpose that do not introduce any element above ground level, thus allow agricultural use of the land by any agricultural machine or technology or using the land for recreational park.

One aspect of the invention is an underground building covered by topsoil free for any agricultural activity by any agricultural technology or machinery.

Another aspect of the invention is that agricultural equipment can be used on this land without interruption.

Yet another aspect of the invention is that underground building have convex top structure that carries the topsoil load and plants weight.

Another aspect of the invention is underground building having a ventilation system which intake fresh air from a location far from the area on top of that underground building.

Yet another aspect of the invention is underground building having a ventilation system, which intakes and exhausts air through retractable pipes.

Still another aspect of the invention is that the ventilation system air intake pipes are equipped with closing devices.

Still another aspect of the invention is that the ventilation system air intake pipes closing devices are remotely opened and closed.

Still another aspect of the invention is that the ventilation system is equipped with air moving devices such as electrically driven axial fans.

Still another aspect of the invention is that the ventilation system monitors air quality in the building and increase or decrease airflow volumes by changing amount of electrical current or frequency supplied to the electrical motor fans.

Still another aspect of the invention is that the ventilation system comprises devices that monitor the level of oxygen and carbon dioxide in the building and increase or decrease the amount of fresh air sucked into the building by controlling the electrical fan and shutters in the air pipes.

Still another aspect of the invention is that the ventilation system comprises devices that monitor the air pressure in the building, and maintain it slightly higher than air in the surrounding so that gases from the soil and concrete will not dissipate into the building.

Still another aspect of the invention is underground building having ventilation pipe that may change its height according to needs, from below ground level to few meters above ground level.

Still another aspect of the invention is that the underground building ventilation pipe that is equipped with remotely operated closing devices.

Still another aspect of the invention is that the underground building ventilation pipe that is equipped with remotely operated warning light.

Still another aspect of the invention is that underground building ventilation pipes position height and state is controlled by remotely operated control system.

Still another aspect of the invention is that underground building ventilation system comprises high-pressure air tank to supply air to underground building.

Still another aspect of the invention is that underground building ventilation system exhaust air is flowing outward through access tunnel connecting the underground building to ground level.

Still another aspect of the invention is that underground building ventilation system comprises a shutter to block main fresh entrance in emergency.

Still another aspect of the invention is that the underground building has underground road which its opening to ground level is far from the underground building.

Still another aspect of the invention is that the underground building has water basin under the building.

Still another aspect of the invention is that the building is equipped with electrical water pump and pipes that sucks water from the building floor and flow that water away.

Still another aspect of the invention is that underground building has at least one underground car parking floors.

Still another aspect of the invention is that underground building has parking places for electric powered vehicles.

Still another aspect of the invention is that underground buildings have at least one corridor that connects them and allows human walking and electrical vehicles travel between buildings.

Still another aspect of the invention is that underground building has emergency evacuation lift shaft that do not protrude ground level.

Still another aspect of the invention is that underground building has emergency evacuation shaft equipped with stairs and ladders, said shaft top preferably ends at ground level or slightly below.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further understood and appreciated from the following detailed description taken in conjunction with the drawings in which:

FIG. 1 is a vertical cross section through underground building according to one embodiment of the invention.

FIG. 2 is a vertical cross section through underground building showing details of the ventilation system according to one embodiment of the invention.

FIG. 3 is a top view of underground buildings with underground ventilation system and underground roads, according to one embodiment of the invention.

FIG. 4 is a section view of underground building retractable-variable height ventilation pipe according to one embodiment of the invention.

FIG. 5 is a section view of underground building retractable-variable height ventilation pipe according to another embodiment of the invention.

FIG. 6 is a horizontal section view of underground building section ventilation pipes.

DETAILED DESCRIPTION OF THE INVENTION

This invention discloses a method and designs for underground buildings that may support prolonged human activity inside such building thus leaving the top surface of the land to be used for agricultural or green-park for recreational purposes.

As world population increases, demand for agricultural products increases, which increases the importance of agricultural lands. However, agricultural lands founds around ever growing cities, which put pressure to build new building on these lands. The location of these lands is an advantage to city residents, which prefer to travel less from home to work and back. Thus, while agricultural lands are important for agricultural crops, high demand for lands near cities for new building projects prevent this use. This justified need to preserve agricultural land, forces entrepreneurs to build new projects far from the city. This causes lengthier travel time from city to new industrial/office parks, increases transportation cost and air pollution. Further, when building new cities, this invention could help in design compact city which make use of underground area for office building while the upper land surface serve for green parks, thus improving the life quality in the city.

Underground cellars are common knowledge and usually found under existing buildings, however, current underground structures prevents intensive agricultural activity by tractors, combines trucks and air spraying.

Further, underground building serving as office building while the land above is a green park would create a highly pleasant working area since workers of these building could spent launch breaks in such park.

It is the aim of this invention to disclose a method and designs, which enable dual use of agricultural land, i.e., intensive agricultural use of the land and high quality human environment for any human activity in underground buildings.

FIG. 1 is a vertical cross section through two adjacent underground buildings 10 and 40, according to one embodiment of the invention. An under ground road (tunnel) 14 allows humans and automobiles to enter underground building 10 from entrance 17, which is beyond from the boundaries of the agricultural land. The distance from entrance 17 and nearest building should be long enough to assure that polluted air due to agricultural activity such air spray of harmful chemicals will not penetrate the underground building. Such distance could start at ten meters and preferably more than hundred meters. If the entrance 17 is near the agricultural land, the ceiling 16 is preferably under the ground level. In case the entrance 17 is not in the agricultural land, the ceiling 16 is preferably above ground level as shown in FIG. 1, thus creating a shelter for security personnel checking the coming vehicle. This small building is preferably located at the edge of the agricultural land. However, since chemical spraying required for agricultural need is not daily routine for the same land, such entrance is preferably equipped with doors than can seal the tunnel 14 from polluted air while the air is polluted. Thus the underground building leaves the ground top surface 20 uninterrupted for any agricultural use or green-park, or any other use. This tunnel 14 and its characteristics are one aspect of the invention.

The underground building is equipped with sophisticated ventilation system—shown in FIG. 2—that provides continuous flow of fresh air into the building and continuously removes used air from the inside of the building to the atmosphere. In case of emergency, when main fresh air intake channel, 54, 59, 69 in FIG. 1, cease to operate because of malfunction of electric fans or blockage, pipes 24 and 25 are activated and erected from under ground level position to the shown position. Routinely, these retractable pipes top ends are well below ground level, preferably 50 centimeters, to allow heavy agricultural machines such as tractor 22 travels on their tops. These retractable air intake and air exhaust pipes are another aspect of the invention.

Building 10 has multi floors 12 and part or all serve as parking lot for car and trucks. Optionally there is also a parking place for electrical vehicles that may be used to travel between underground buildings through under ground corridors 44, which are another aspect of the invention. Preferably, the underground building is equipped with convex dome 24 that efficiently carry the soil 21 load and plants (not shown) weight. This convex dome is preferably made of reinforced concrete. The underground building optionally has bottom basin 9 where underground water may be accumulated and removed by a drainage system 90-95 shown in FIG. 2. Each underground building is optionally equipped with emergency evacuation lift 26 traveling in shaft 28. The lift 26 top surface at maximum lift top position do not protrude ground level. Thus, human need to leave the building using this lift, in emergency case, walks out the lift through lift door 27, stands on vertically moveable box 31 and activates it travel upward. Box 31, equipped with electrical motor 32 that is part of moving mechanism similar to system 200-207 described in FIG. 5. This moving system lift the box 31 to about ground level, while the horizontal cover 34 is raised, by an electric or manual actuator 36, thus, when the box 31 top level reaches about ground level 20, people can leave the box and walk away. Then, the box 31 returns to bottom position to take additional passengers exiting the lift 26.

This can be done automatically after predetermined time of being in upright position or reacting to direct activation of people in the lift 26. Routinely, the cover 34, preferable made of steal, is at horizontal position, covering the space 30. The cover 34 is installed on vertical concrete walls 35, which their top surfaces are below ground level 20, about 30 to 50 centimeters. This is a strong structured plate that allows heavy loads such as tractor wheel driving on it without damage to the cover. Thus when cover 34 is in its non-emergency state, i.e., lying horizontally, any agricultural activity in the field 20 can take place.

In addition emergency stairs shaft are optionally built to allow emergency exit from underground building. Such stair shafts could end below ground level, similar to shaft 40, so that humans can exit using stairs or ladders. Such stairs shaft, accessed from any floor, is equipped with cover 34 as explained before. Further, emergency evacuation shafts for lift and stairs could end above ground level so that people can reach ground level into a small building having a door that can be opened from inside this small building, thus the evacuees may leave these shafts and go away by foot on the field or park.

Another option to leave such underground building is by using lift or stairs up to the level where tunnel 14 entered the underground building and leave the building through tunnel 14 by walking or driving cars.

The ventilation pipes shown in emergency state has remote controlled shutters (128 in FIG. 2) on their openings. Thus, when the pipes are erected, the shutters are open to allow fresh airflow into pipe 25 to the building and used air to flow out through pipe 24. These two pipes can be installed into one big pipe where their opening face different directions. This ventilation system is another aspect of the invention.

Usually, when not at emergency state, humans enter and leave the buildings through tunnel 14. Each underground building is preferably equipped with underground access tunnel 14 or a tunnel connecting a building to the underground access tunnel 14. Thus, any agricultural activity on field 20 can take place without interrupting or endangered human activities in the underground building.

Properly designed and built underground building according to the present invention have many advantages over usually above ground buildings:

Firstly, such buildings are highly earthquake resisting since earthquake horizontal loads are opposed by the soils 21 that supports the entire vertical walls. This is a very important factor that reduces the underground building structure required strength and cost.
Secondly, underground buildings are not influenced from extreme weather changes thus air-conditioning costs are reduced.
Thirdly, underground building can be built under agricultural lands around the city thus shortening the distance and time to travel from the city, thus saving time, fuel cost and pollution.
Fourthly, since agricultural land is much cheaper than land for office building, the over cost of building and land is low.
Fifthly, since air entering and exiting the building floors are controlled, fire suppression is easier by shutting the fresh air supply to a fire. This issue will become clear after reading, the ventilation system description for FIGS. 2 and 6.

To increase human ease of prolog stay in under ground building, inner underground building walls may be equipped with natural landscape pictures or Plasma or LCD screens showing natural landscapes or even the landscape of the land on top of the underground building. Further, natural voices of birds and wind and trees noises may be played at low volume to give feeling of nature atmosphere. Also natural scents may be sprayed to give the air nature “touch”. All these features may be activated manually or by a computerized ventilation system.

Thus, underground building, according to this invention enable prolonged human activity including living, office work, commercial activity and light industry such printing, etc. This is possible since each section of the underground building preferably has its own ventilation system so that fumes are removed without polluting any other sections in the buildings. Any section of the underground building is preferably accessed by underground road and there is preferably, parking places for electrical vehicles near each section so that people can travel miles between many underground buildings.

The emergency ventilation pipes 24, 25 diameters are at least 10 centimeters and preferably about 50 centimeters but larger diameters could be used. These pipes equipped with electrical fans. An underground building could be equipped by any number of such pipes. The electric grid pole 18 provides electricity to the underground building.

FIG. 2 shows a vertical cross section through underground building. The air ventilation system main components are schematically depicted so that people skilled in the art of ventilation design system can prepare detailed design plan. Fresh air 55 is sucked into pipe 54 equipped with electrical driven, preferably, axial fan 58. Fresh air is flown through underground about horizontal pipe 59, toward vertical pipe 60 that runs parallel to the underground building wall 10 (FIG. 1). At each floor 62, a short horizontal pipe 67a, flows fresh air into the floor. At each floor 62 other side, there is air exhaust pipe 67b, that intakes used air and flows it into exhaust pipe 69. The used air 68 is now flowing up in vertical pipe 69 toward about horizontal exhaust pipe 70 and toward the vertical exhaust pipe 72, which is optionally equipped with electrical driven axial fan that pushes the used air upward to the exit 74. Air exits 67b preferable equipped with remotely operated shutters that have variable opening thus, a remote control ventilation system can change this shutters opening in order to increase or decrease the air pressure inside the building to prevent radon dissipation from the soil and concrete walls into the building.

The ventilation system optionally equipped with high-pressure air tanks 66. The compressor 64 is connected to the fresh air pipe 60 and compresses the air into tanks 66. These tanks could hold air at 200 bars or more. In emergency, when fans 58, 71 cease operating and carbon dioxide level exceeds maximum allowed level for humans or any other preferred level, the ventilation control system, shuts the shutter 80 to closing position 82 and opens the high-pressure tanks 66 that supply fresh air to the ventilation system. The high-pressure tanks 66 are connected to the ventilation system through a pipe (not shown), which bypass the compressor. Thus, in emergency, fresh air from the high pressure tanks flow into main feeding pipe 60 and to each level pipe 67a. The shutter 82 prevents fresh air to leave the system through pipe 59. The shutter 80 has a rotating mechanism 81 that is controlled by the ventilation control system. This mechanism can be build by different designs. One simple mechanism is the one found commercial building electrical shutters. A dc electrical motor that change rotation direction according to electrical current direction. The electrical motor shaft drives a planetary gearbox which decrease the electrical motor number of revolutions by a factor of about 30 thus increasing the out torque that moves the shutter 80 into position 82 and vice versa. Stopper 83 blocks the shutter and the electrical current to the motor is stopped. When the emergency situation do not exist the ventilation system return to normal procedure: the shutter 82 is opened to position 80, the electrical fan 58 pushes fresh air into pipe 59, and compressor 64 pumps air into high pressure tanks 66.

The intake pipes 54, 126 are variable height pipes equipped with a top closing devices 50 and 128, so when there is a need to spray anti pesticide for agricultural purposes, the pipe closing, device closes the pipe and prevent harmful gases entering the ventilation system. This closing device is electrically operated by the ventilation control system. The activation of this closing and height changing can be done manually or preferably automatically by lifting-lowering electrical mechanism shown if FIG. 4. The ventilation control system, which is preferably equipped with sniffing sensors that continuously monitors the quality of air entering pipes 126 and 54. Each of ventilation pipes is preferably equipped with powered fan that forces air into the building or outside the building.

The emergency pipe 126 is preferably equipped with closing device 128—various shapes 128b and 128c shown in FIG. 4—so that when the pipe 126 is retracted, the closing device 128 lies under ground level and it is strong enough to support tractor wheel. Fresh air intake pipe 126 is equipped with preferably, electrical axial fan, which is remotely operated by the ventilation control system. In case of electricity supply breakdown, the underground building is equipped with electrical generator 140 in FIG. 2, installed in a independent section and powered by fuel or pressurized air pressure engine. This electrical generator 140 receives its air through the ventilation system—pipe 67a and its exhaust fumes are removed by a pipe 67b to pipe 69.

The access tunnel 14 is preferably serves as used air exhaust channel that receives airflow from pipe 69. This helps remove cars exhaust gases from entering the building through tunnel 14. In such case, optional axial fans could be installed on tunnel 14 ceiling directing airflow toward the entrance 17. This is another aspect of the invention. FIG. 6 is a horizontal cross section of the ventilation system in each floor. The fresh air supply pipe 60 provides air to pipe 67a, which is preferably equipped with electrical axial fan 67d. An emergency fresh air supply pipe 126, also shown in FIG. 2, is also connected to horizontal pipe 67a that flows fresh air into the building section. Thus, in case airflow in pipe 60 is blocked, the ventilation control system erects pipe 126n to above ground level, opens its, closing device 128 and turns on its electrical fans. At the same time the ventilation control system shuts pipe 59 using mechanism 80-83 to prevent fresh air exiting the system. Used air in floor 62 flows into pipe 67b and into vertical pipe 69 also shown in FIG. 2. In case of blockage in pipe 69, the ventilation control system erects emergency pipe 122, opens its closing device 128 to let used air leave the ventilation system. The ventilation floor system preferably equipped with axial fan 67d and variable position shutter 67c thus air pressure in floor 62 can be increased either by increasing the electrical power provided to axial fan 67d or by narrowing the exhaust are by shutter 67b, and vice versa. The outer wall 10 is shown.

Air condition system, is optionally installed in each floor to warm or cool the air. The air condition system is optionally controlled by the ventilation control system and having manual override.

The underground building is optionally equipped with water drainage system 90-95. There are locations where underwater are found near ground level surface thus an underground building could be surrounded by water, which could penetrate into the underground building and flow down to the building bottom 12. To remove this water, a pipe 90 which its opening is close to the space 112 floor, sucks this water by the power of electric pump 92 which further pushes the water upward into pipe 92 toward a pipe 94 which may flow the water toward sewerage system or water reservoir.

FIG. 3 is a top view of underground buildings arrangement according to one embodiment of the invention. Vehicles use public ground level road 100 to arrive these underground buildings 200, 300. Access road 102 is an exit from road 100 toward the underground parking lot floors 108. The circle road 106 may go down to bottom-floor of the building. The exit road 104 serves cars leaving the under ground parking lot 108 to travel toward road 100.

The underground building 200 is preferably divided into sections 112 where each section receives its own fresh air through main fresh air supply pipe 122 (only half is show for purpose of clarity) and section fresh inward pipe 126 and used air outward pipe 129. Thus, each section receives air independently from other sections. Optional electrical axial fans could be installed in each pipe of the ventilation system to increase airflow as shown in FIG. 6. The used air, flows through pipe 130 into pipe 136 and into a vertical exhaust pipe 138 (equivalent to pipe 73 in FIG. 1), which is far from the area that covers the underground building, thus allow intensive agricultural use of the land over this building. The fresh air is entered the ventilation system through vertical pipe 120, which like pipe 138 is located far from the are above the underground building. From the intake pipe 120, fresh air flows (driven by electrical powered axial fans) toward pipes 122, 126 and to the different underground building's sections 112. Both buildings 200 and 300 are preferably equipped with all the emergency equipment depicted in FIG. 1, such as retractable-variable height pipes 24, 25 and emergency exit lifts 26, 31. Corridors 150 serve people going from section to section and allow electric vehicles travel between sections. Each building is equipped with lifts that travel between the building floors. Section 110 is optionally parking lot, preferably at each floor, so that people parking their cars in parking lot 108, could use electrical vehicle parking in section 110 and travel to remote sections through corridors 115. These electrical vehicles could belong to a carsharing fleet operated by smart cards. Each section preferably equipped with local cellular network antenna or a cell of cellular system thus enabling occupants in these building to use their cell phones.

The ventilation system is preferably comprises sensors that monitors air quality entered the ventilation system to prevent intake of chemicals, carbon dioxide level and radon level. When chemicals above permitted level are found in the intake pipe 59 or inside the building, the control system shuts shutter 80 and activates the high pressure backup system to provide fresh air to the under building occupants. Another emergency case is when the electrical fans 58 and 71 stop functioning. Then the same emergency procedure repeats itself however, pipes 24, 25 are erected to allow fresh air intake and use air exhaust through these pipes. If the air coming from pipe 25 is good for breathing, the high-pressure tanks may stop providing their stored air. If however, the outside air contains chemicals, the pipes 24, 25 are retracted and sealed and emergency alarm is sound and emergency signs are lightened to inform people to leave the building through access road 14. The ventilation control system preferably incorporates smoke and fire sensors. In case of fire, emergency control system identifies the section where fire broke, activates the emergency signs to order people to immediately evacuate the fire zone and close the shutters installed in fresh inlet pipes 67a, that provides fresh air to the fire zone, thus preventing oxygen supply to the fire in the fire zone. These shutters have similar mechanism 80-83 described for FIG. 2. Similar shutters are preferably installed in exit pipes 67b thus the control system may closed them partially to regulate the air pressure in each section in order to prevent Radon dissipating into the underground building.

FIG. 4 is a cross section through retracting variable ventilation pipe 126 and 122 in FIG. 2. The top blocking “hat” 128 comprises a flat, preferably, circular plate shown in its upright position where the holes 129 allows fresh atmospheric air 130 to flow into the pipe 127. When blocking element is in its lowest position its top surface blocks the pipe 126 top entrance and holes 129 are blocked by the cylindrical walls of pipe 126. In routine state of the underground building, pipe 126 is not in use and it is retracted to the position 122 in FIG. 2 and the hat is in lowest position below ground level thus it do not interfere with agricultural activity. The raising/lowering mechanism comprises an electric motor, which rotates clockwise and anti-clockwise at will combined with planetary gearbox in the same package 200. The shaft 202 rotates clockwise or anticlockwise according to desired function of raising or lowering the hat 128. The shaft 202 has a driving thread along it length and nut 204 having the same thread as the shaft 202, travels up or down along shaft 202. Nut 204 is firmly connected to cylinder 206. The top edge of cylinder 206 is connected through pin 210 to the bottom of pipe 127. Thus, when motor 200 rotate in one direction it pushes the hat 128 upward and when the motor 200 rotates the opposite direction, it pulls the hat 128 downward. Thus the ventilation control system can open or close the entrance of pipe 126. A similar mechanism 220-229 connected to pipe 125 pushes pipe 126 upward or pull it downward. It should be noted that the length of movement corresponds to the length of the shafts 226, 206, the longer the shaft, the lengthier the movement and the length of the moving pipe. This mechanism is very well known but other mechanisms can be used. One example is shown in FIG. 5.

FIG. 5 shows the ventilation-retracted pipe 126 equipped with different lifting—retracting mechanism 200-207. Electrical motor 200 is the same as described in FIG. 4. The t rotating shaft has no threads but a conic 45 degrees gear 202 is installed on its top edge and rotates whit the shaft 201. The gear 202 is engaged with correspondent gear 203 which is also a conic gear which installed on rotatable shaft 206 which is mounted into a bearing house 207 which is firmly attached to pipe 126. On the shaft 206 a straight gear 205 is installed and rotate with conic gear 206, a rectangular gear rack 204, which is firmly attached to the pipe 127 is engaged with gear 205. Thus, when electrical motor 200 rotates in one direction it lifts the hat 128a, and when it lift in the opposite direction, it lowers the hat 128.

The advantages of the mechanisms shown here is that they installed within the pipes thus protected from dirt. The ventilation control system preferably, lifts the bottom pipes first and the topper later so the hat 128 is lifted when it is well above ground level so that dirt will not enter the pipe as it sucks fresh air into the underground building.

The horizontal cross section of the underground building is optionally made of circular shape to increase the stiffness of the underground building to underground hydrostatic pressure and earthquake resistance. The underground building domes 24 in FIG. 1 or 110 in FIG. 2 have better strength than flat ceiling because the heavy weight of soil 21, crops and trees and heavy vehicles such trucks, combines and tractors.

The underground building could be accessed by underground train (metro) so that a underground train station could be located near such building and underground tunnel connect this station to the underground building.

It will be appreciated that the invention is not limited to what has been described hereinabove merely by way of example. Rather, the invention is limited solely by the claims, which follow.

Claims

1. A method that allows using land for agricultural or recreational purposes and build building underground this land for human use comprises of:

a. an underground building which is completely under ground level;

b. a layer of soil on top of said building, having top surface in about similar level of nearby soil so that the soil enables agricultural purposes or green park for recreational activities.

2. A method according to claim 1 where underground building has access tunnel which its exit is far from the underground building perimeter.

3. A method according to claim 1 where underground building has ventilation system that intake fresh air through pipe which its intake fresh air opening is not interfering with potential agricultural activity.

4. A method according to claim 1 where underground building has ventilation system that intake fresh air through pipe which its intake fresh air opening is far from the underground building perimeter.

5. A method according to claim 1 where underground building has ventilation system that comprises retractable intake air pipe.

6. A method according to claim 1 where underground building has ventilation system that comprises powered fan that cause fresh air entering and leaving the ventilation system.

7. A method according to claim 1 where underground building has ventilation system that comprises devices to increase or decrease the airflow within the ventilation system.

8. A method according to claim 1 where underground building has ventilation system that comprises devices that control the air-pressure within the underground building.

9. A method according to claim 1 where underground building has ventilation system that comprises high-pressure air tanks to provide fresh air to underground building occupants.

10. A method according to claim 1 where underground building has ventilation system that exhaust air through car access tunnel thus removing cars exhaust gases entering the underground building.

11. A method according to claim 1 where underground building has electric generator that provides electricity in case of public electricity failure.

12. A method according to claim 1 where underground building has emergency lift car and shaft that while not in use, do not interfere with potential agricultural activity of the land above the underground building.

13. An underground building according to claim 1 having a convex structure dome to carry soil load.

14. An underground building according to claim 1 having a basin that collects water seeping into the building.

15. An underground building according to claim 1 having a drainage system that removes water from water basin.

16. An underground building according to claim 1 having corridors connecting it to another underground building.

17. An underground building according to claim 1 having parking places for cars.

18. An underground building according to claim 1 having electric vehicles for transportation within the building.