JP2857812B2 - Water stopping method and structure of underground structures using air pressure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping method and a water stopping structure for preventing underground water from penetrating into underground structures such as nuclear power generation facilities and radioactive waste storage facilities.

[0002]

2. Description of the Related Art In general, a waterproof material is applied to a base slab or an underground outer wall portion of an underground structure to prevent the penetration of underground water, thereby providing a waterproof layer by applying or applying a waterproof material. However, some nuclear power plants require that the foundation slab be constructed so as to be directly in contact with the supporting ground from the seismic standards, so a waterproof layer could not be applied to the bottom of the foundation slab. .

[0003]

Among the above-mentioned conventional underground structures, nuclear power plants and similar facilities in which a waterproof layer cannot be installed on the bottom surface of the base slab or the underground outer wall are used for the purpose of waterproofing. It was necessary to take additional measures to stop water, such as installing drainage equipment to reduce the water pressure. Therefore, there was a drawback that extra work had to be performed or the thickness of the floor slabs and walls had to be significantly increased. It is an object of the present invention to solve this drawback and to make it possible to stop water from an underground structure by a simple method and structure.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a basement slab of an underground structure and a cavity inside a basement outer wall, and uses an air pressure for supplying compressed air into the cavity. Water-stopping method for structures, water-stop structure for underground structures using air pressure by connecting a pressurized air source to a cavity installed in the center of the base slab of the underground structure and the center of the underground outer wall, and the base slab and basement A compression pump is installed inside a double-structured underground structure with a cavity in the middle of the outer wall, and water pressure of the underground structure using air pressure that connects the pressurized tank and the double-structured cavity that communicate with it It takes structural measures.

[0005]

The operation of the present invention will be described with reference to embodiments.
In the base slab 4 and underground outer wall 12 of the present invention, the cavity 7 is provided.
A compressed pump 16 pressurizes compressed air having a pressure equal to or higher than the water pressure at which groundwater permeates between the base floor slab 4 or the underground outer wall 12 and the support ground 2 from a pressurized air source. 17 and is supplied into the cavities 7 and 11 at an appropriate pressure, so that it passes through the base slab 4 and the lower slab 6 and the outer wall 9 of the underground outer wall 12 and the upper slab 5 and the inner wall 8. This prevents water from penetrating into the underground structure without penetrating into the underground structure.

Further, in the case of a nuclear power generation facility, it is required that the pressure inside the room be kept lower than the outside pressure to maintain a negative pressure in order to ensure the safety of radiation control. Since the inside of the cavity is pressurized to increase the air pressure from the indoor side, even if the outer wall or the like is completely damaged, the radioactive substance does not leak to the outside from the damaged portion.

[0007]

An embodiment of the present invention will be described with reference to the drawings. An underground structure 3 extending from the ground surface 1 to the supporting ground 2 therebelow is constructed. The basement slab 4 of the underground structure 3, especially a nuclear power generation facility or the like, is in direct contact with the supporting ground 2, and has a double structure of an upper slab 5 and a lower slab 6 and is provided with a cavity 7 therebetween. Is provided with an underground outer wall 12 having a double structure of an inner wall 8 and an outer wall 9 and having a cavity 11 extending from the lower part of the beam 10 to the floor surface of the base slab 4 between the two. A pillar 14 is provided which passes to the ground floor 13, and a floor 15 of the first basement floor is provided at a height connecting the beams 10 and 10. In the drawing, no cavity is provided on the outer wall 12a on the first basement floor, but a cavity can be provided depending on the condition of groundwater.

A compression pump 16 and a pressure tank 17 are provided on the upper slab 5 as a source of pressurized air.
The compressed air compressed in 6 is stored in a pressurized tank 17 and supplied into the cavity 7 by an air pipe 18, and a portion where the lower part of the underground outer wall 12 and the pillar 14 intersects with the base slab 4 is the base slab 4.
The cavity 7 is not provided because the thickness of the portion is so large that it is difficult to cause cracks. Therefore, the cavity 7 is divided into right and left in the base slab 4, and between the right and left cavities 7, 7 and the cavity 7
And an air pipe 1 between the cavity 11 of the underground outer wall 12 and
9.

[0009]

According to the present invention, since only a double-layered base slab having a hollow center portion and an underground outer wall are constructed and the cavity is pressurized, it can be constructed using a conventional underground construction method. Waterproof performance equivalent to that provided with a waterproof layer without applying a waterproof layer to the lower surface of the base slab can be obtained, and there is an advantage that there is no aging deterioration and construction defects as with a waterproof layer provided In the case of underground structures such as nuclear power plants, where foundation slabs need to be built directly on the supporting ground,
It is necessary to separately provide water distribution equipment for reducing the water level and water pressure of the groundwater, and to significantly increase the thickness of the foundation slab and the underground outer wall. Water can be stopped by a simple method and structure that is almost the same as the above, and the pressure of the surrounding floor slabs and cavities in the walls is higher than the air pressure inside the room, so the reliability of radiation management safety is improved. It is effective for

[Brief description of the drawings]

FIG. 1 is a cutaway front view showing one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 underground structure 4 foundation floor slab 7 cavity 11 cavity 12 underground outer wall 16 compression pump 17 pressurized tank

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-55-52996 (JP, A) JP-A-59-133496 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 31/02 E02D 29/045 G21C 13/00

Claims (3)

(57) [Claims] 1. A cavity (7), (11) is provided inside a base slab (4) and an underground outer wall (12) of an underground construction (3), and compressed air is provided in the cavities (7), (11). Method of stopping underground structures using air pressure to supply water. 2. A source of pressurized air (16) in a cavity (7), (11) installed in the center of the base slab (4) of the underground structure (3) and the center of the underground outer wall (12). (17) A water stopping structure for an underground building using an air pressure connected to (17). 3. A base slab (4) and an underground outer wall (12).
A compression pump (16) is installed inside a double-layered underground construction (3) having cavities (7) and (11) in the middle, and a pressurized tank (17) communicating therewith and A water stopping structure for an underground building using air pressure that communicates the cavities (7) and (11).