Apparatus and construction method for naturally discharging groundwater in response to uplift pressure of building

Abstract

The present invention relates to an apparatus for naturally discharging groundwater, wherein blind drains are installed in the subsurface ground beneath respective columns of an underground structure, and drainage pipes are vertically embedded in the respective columns of the underground structure, with lower ends thereof connected to the blind drains installed in the subsurface ground and upper ends thereof exposed above the ground and connected to an integrated connection pipe. Therefore, when the level of groundwater collected in the blind drains rises and the water pressure increases, the groundwater overflows to the upper ends of the drainage pipes by the self-weight of a building acting on the bottom surface of the building to be naturally discharged to a sump pit through the integrated connection pipe.

Description

Natural groundwater discharge device and construction method for responding to positive pressure in buildings

[0001] The present invention relates to a natural groundwater drainage device and construction method for responding to uplift pressure in a building, which prevents cracking and leakage in floor concrete by reducing uplift pressure acting on the foundation of a building with a deep basement due to high upward pressure of groundwater. More specifically, the invention relates to a natural groundwater drainage device and construction method for responding to uplift pressure in a building by installing a permanent drainage pipe connected to a blind culvert in the underground ground beneath the foundation concrete layer within the column of the building to naturally regulate the appropriate groundwater level within the drainage pipe to disperse the groundwater pressure that has risen due to uplift pressure, and by allowing groundwater to be naturally discharged through the drainage pipe installed vertically within the column when uplift pressure acts due to a rise in water pressure above a critical level that can affect the structure.

[0002] Recently, due to the need to secure parking spaces and the combination of building uses, the depth of basement floors in buildings is becoming increasingly deep.

[0003] Generally, when a new building is constructed, the dead weight (self-weight) of the structure is applied to the ground. Since the lowest part of the building is usually lower than the surrounding water level, buoyancy from groundwater acts simultaneously. In this case, if the buoyancy (upward pressure) caused by groundwater is greater than the dead weight acting on the building's floor, the building will float; consequently, the structure will suffer significant damage and safety will be threatened due to the rise and fall of water pressure.

[0004] Conversely, if a large amount of groundwater surrounding and beneath a building is rapidly removed through forced drainage, similar to conventional buoyancy prevention devices, the groundwater level drops below normal, causing various problems and ultimately leading to ground subsidence, which also threatens safety.

[0005] As is well known, methods for dealing with uplift pressure acting on the foundation floor of a building include a method using dead load (dead load) and permanent (buoyancy) anchors, and a permanent drainage system for the foundation floor that forms an artificial sump and drainage layer beneath the foundation floor of the building to collect groundwater along a drainage channel and periodically pump it out to prevent uplift pressure from acting on the foundation concrete.

[0006] However, the former has limitations such as not being able to guarantee continuous reliability of the tensile strength of the buoyancy anchor in relation to the durability and safety of the building and not being applicable to all ground, as well as having high construction costs, a long construction period, and many waterproofing defects in the anchor drilling area.

[0007] In addition, compared to the former method, the latter not only can more stably and permanently resolve the problem of upward water pressure acting in proportion to the high groundwater level, but also has the advantage of easy overall process management due to its simple construction.

[0008] Therefore, the latter permanent drainage system is widely applied as a positive pressure treatment method; however, in such a system, a large-capacity sump is integrally installed beneath the foundation slab of an underground building, with the inlet connected to the outlet of a drainage facility installed beneath the foundation slab, the top of the sump is exposed or a manhole is formed on one side of the ceiling slab, and the height of the sump is approximately equal to the top of the foundation slab.

[0009] As a result, groundwater flowing out from underground is collected through drainage facilities up to the height of the collection well. Therefore, if the groundwater level is higher than the height of the collection well, the groundwater collected in the collection well must be continuously discharged using an electric pump, which inevitably leads to electricity consumption and increased overall maintenance costs. Furthermore, because groundwater is discharged indiscriminately due to continuous pumping, the excessive discharge of groundwater prevents the maintenance of the original groundwater level, resulting in sinkholes caused by subsidence of the underground ground and the depletion of groundwater sources.

[0010] <Prior Art Literature>

[0011] Patent Publication No. 10-2014-0054852

[0012] Patent Publication No. 10-2010-0060333

[0013] The objective of the present invention is to solve such problems by installing a blind culvert to collect groundwater in the underground ground beneath the foundation concrete layer of a building and burying a drainage pipe connected thereto inside a column to guide it to the surface, thereby allowing the groundwater collected in the blind culvert to naturally rise along the drainage pipe without separate power to the magnitude of the uplift pressure generated, maintaining an appropriate groundwater level, and when upward pressure is applied due to excessive inflow of groundwater, it overflows into the drainage pipe inside the column and flows out through the drainage pipe on the surface, thereby providing a natural groundwater discharge device and construction method that responds to uplift pressure in a building while maintaining an appropriate groundwater level.

[0014] The present invention, as a means to achieve this purpose, comprises a blind culvert installed in the underground ground beneath the foundation concrete layer of an underground structure;

[0015] A drainage pipe with one end connected to the above-mentioned blind culvert and the other end exposed above ground;

[0016] An integrated connecting pipe that simultaneously connects the drainage pipes exposed above ground;

[0017] A ground-level collection well for collecting groundwater naturally discharged through the above-mentioned integrated connecting pipe;

[0018] A natural groundwater discharge device comprising: a pump for discharging groundwater collected in the above-mentioned sump to the outside;

[0019] The above blind culvert is installed in the subsurface ground beneath each column of the underground structure, and

[0020] The above drainage pipe is vertically buried inside each column of an underground structure, with its lower end connected to a blind culvert installed in the underground ground and its upper end exposed above ground connected to an integrated connecting pipe, so that when the water level of the groundwater collected in the blind culvert rises and the water pressure increases, the groundwater overflows to the upper end of the drainage pipe due to the self-weight acting on the floor surface of the building and is naturally discharged into a sump through the integrated connecting pipe, thereby providing a natural groundwater discharge device that responds to the positive pressure of a building.

[0021] The present invention comprises a blind culvert installation step of installing a blind culvert in the underground ground below the foundation concrete layer of an underground structure;

[0022] A drainage pipe installation step in which a drainage pipe is installed so that one end is connected to the blind culvert installed in the above blind culvert installation step and the other end is exposed above ground;

[0023] A step for installing an integrated connecting pipe that simultaneously connects the drainage pipes exposed above ground;

[0024] A sump installation step of installing a sump on the ground to collect groundwater naturally discharged through the above-mentioned integrated connecting pipe;

[0025] A method for constructing a natural groundwater discharge device comprising: a pump installation step of installing a pump to discharge groundwater collected in the sump to the outside;

[0026] The above blind culvert installation step further includes the step of installing the blind culvert in the lower underground ground of each column of the underground structure, and

[0027] The present invention provides a method for constructing a natural groundwater discharge device that responds to positive pressure in a building, characterized in that the above-mentioned drainage pipe installation step further includes a step in which the drainage pipe is vertically buried inside each column of the underground structure, the lower end is connected to a blind culvert installed in the underground ground, and the upper end exposed above ground is connected to an integrated connecting pipe.

[0028] As such, according to the present invention, groundwater beneath the foundation concrete layer of a building is collected in a blind drain and discharged to the ground without separate power by being raised by the load of the building's own weight according to the magnitude of the uplift pressure through a drain pipe installed vertically in a column. Therefore, under normal circumstances, an appropriate groundwater level is maintained in the drain pipe inside the column, and when the groundwater level rises during the rainy season, it overflows into the drain pipe due to the building's own weight and is naturally discharged into a sump, thereby maintaining an appropriate groundwater level and relieving the uplift pressure. Furthermore, since excessive discharge of groundwater does not occur before reaching a certain water pressure, it has the effect of protecting the groundwater source and preventing ground subsidence.

[0029] FIG. 1 is an internal structural diagram of an underground structure to which an embodiment of the present invention is applied.

[0030] FIG. 2 is a cross-sectional view of section "A" of FIG. 1.

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings, focusing on the parts necessary to understand the operation and function according to the present invention.

[0032] The embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all of the technical concepts of the present invention; therefore, it should be understood that various modifications capable of replacing them may exist at the time of filing this application.

[0033] In describing the embodiments of the present invention, unnecessary technical details that are well known in the technical field to which the present invention belongs and are not directly related to the present invention are omitted to ensure clearer communication without obscuring the essence of the invention.

[0034] With reference to FIGS. 1 and 2, the natural groundwater discharge device corresponding to the positive pressure of the building of the present invention comprises: each blind culvert (30) installed in the underground ground below the foundation concrete layer (11) where the column (20) of the underground structure (10) is located; each drainage pipe (40) installed vertically inside or outside each column (20), with the lower end penetrating the foundation concrete layer (11) and connected to the blind culvert (30) of the underground ground and the upper end exposed to the ground; an integrated connecting pipe (50) that simultaneously connects each drainage pipe (40) exposed to the ground; a groundwater collection well (60) that collects groundwater naturally discharged through the integrated connecting pipe (50); and a pump (70) that discharges the groundwater collected in the collection well (60) to the outside.

[0035] The above blind channel (30) is formed as a channel of a certain size filled with gravel (31) and rubble, etc., for collecting groundwater in the underground ground below the foundation concrete layer (11) where each column (20) built in the underground structure (10) is located, and a non-woven fabric (32) is installed on the outside that contacts the ground to prevent the inflow of foreign substances and to function as a filter.

[0036] The above drain pipe (40) is installed so as to be integrally embedded inside the reinforced concrete column (20) of the underground structure (10) during construction, or is installed vertically fixedly outside, with the lower end connected to a blind drain (30) and the upper end guided to the ground, so as to discharge groundwater with increased water pressure collected in the blind drain (30) to the ground due to the load of the building.

[0037] The diameter of the drain pipe (40) is approximately φ 10 to 500 mm and is adjusted according to the ground conditions where the structure is constructed in the form of a single or bundled pipe, groundwater inflow conditions, permeability coefficient, etc., but it is not necessarily limited to this and can be configured with a smaller or larger diameter.

[0038] Additionally, the drain pipe (40) may be partially installed on the columns (20) or installed on each of the columns (20) depending on the conditions of the ground where the building is constructed, and in some cases, the drain pipe (40) may be installed exposed in sections where there are no columns.

[0039] Each drainage pipe (40) guided to the ground as described above is connected to an integrated connecting pipe (50), and groundwater that overflows from the drainage pipe (40) and is naturally discharged is collected in a collection well (60) through the integrated connecting pipe (50).

[0040] One or more sumps (60) are installed on the ground according to the size of the building, and as shown in the example of the drawing, when installed on both sides of the building, groundwater discharged through the integrated connecting pipe (50) can be collected more quickly.

[0041] In this invention, groundwater flowing into the lower ground of an underground structure (10) flows into and is collected in blind drains (30) corresponding to each column (20) installed in the underground ground below the foundation concrete layer (11). The blind drains (30) are filled with gravel (31) and rubble inside, and a filter or non-woven fabric (32) is attached to the outside that contacts the ground, thereby collecting groundwater from which foreign substances have been filtered.

[0042] When the water level of the groundwater collected in the blind drain (30) rises and the upward water pressure acting on the bottom surface of the underground structure (10) increases, the groundwater penetrates the foundation concrete layer (11) and rises due to the self-weight of the building through the drain pipe (40) connected to the blind drain (30), thereby maintaining the water level at a height due to the water pressure inside the drain pipe (40), so that the positive pressure is lost and at the same time, the appropriate water level is maintained.

[0043] In this state, if the water level of the groundwater collected in the blind drain (30) rises or if a large amount of groundwater flows in during the rainy season and the water pressure rises further, the groundwater rises to the top of the drain pipe (40) due to the self-weight acting on the floor surface of the building and overflows, and the overflowed groundwater is collected in the collection well (60) through the integrated connecting pipe (50), and when it reaches a certain water level, it flows out naturally or is discharged to the outside by a pump (70).

[0044] The blind culvert (30) of the present invention is installed in the underground ground corresponding to the column (20) of the underground structure (10) to efficiently collect groundwater gushing out from the underground ground of the building, and each drain pipe (40) connected to the blind culvert (30) performs drainage independently so that no positive pressure is generated, thereby preventing damage to the underground structure (10) and maintaining safety.

[0045] The construction method for a natural groundwater discharge device that responds to the positive pressure of such a building consists of the following steps.

[0046] A blind culvert installation step of installing a blind culvert in the underground ground beneath the foundation concrete layer of an underground structure;

[0047] A drainage pipe installation step in which a drainage pipe is installed so that one end is connected to the blind culvert installed in the above blind culvert installation step and the other end is exposed above ground;

[0048] A step for installing an integrated connecting pipe that simultaneously connects the drainage pipes exposed above ground;

[0049] A sump installation step of installing a sump on the ground to collect groundwater naturally discharged through the above-mentioned integrated connecting pipe;

[0050] A method for constructing a natural groundwater discharge device comprising: a pump installation step of installing a pump to discharge groundwater collected in the sump to the outside;

[0051] The above blind culvert installation step further includes the step of installing the blind culvert in the lower underground ground of each column of the underground structure, and

[0052] The above drainage pipe installation step further includes a step in which the drainage pipe is vertically buried inside each column of the underground structure, with the lower end connected to a blind culvert installed in the underground ground, and the upper end exposed above ground connected to an integrated connecting pipe.

[0053] The construction method described above is carried out in stages during the building construction process; however, the order of the stages may be changed depending on the construction environment. Additionally, the groundwater pressure status of underground structures, column spacing, and the diameter of drainage pipes for each column must be taken into account soil conditions based on the soil permeability coefficient and groundwater flow. In some cases, drainage pipes may be installed exposed in sections without columns.

[0054] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications, changes, and substitutions within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments and accompanying drawings. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A blind culvert installed in the underground ground beneath the foundation concrete layer of an underground structure; A drainage pipe with one end connected to the above-mentioned blind culvert and the other end exposed above ground; An integrated connecting pipe that simultaneously connects the drainage pipes exposed above ground; A ground-level collection well for collecting groundwater naturally discharged through the above-mentioned integrated connecting pipe; A natural groundwater discharge device comprising: a pump for discharging groundwater collected in the above-mentioned sump to the outside; The above blind culvert is installed in the subsurface ground beneath each column of the underground structure, and A natural groundwater discharge device for responding to positive pressure in a building, characterized in that the above-mentioned drain pipe is vertically buried inside each column of an underground structure, with the lower end connected to a blind culvert installed in the underground ground and the upper end exposed above ground connected to an integrated connecting pipe, so that when the water level of groundwater collected in the blind culvert rises and the water pressure increases, the groundwater overflows to the upper end of the drain pipe due to the self-weight acting on the floor surface of the building and is naturally discharged into a sump through the integrated connecting pipe.

2. A blind culvert installation step of installing a blind culvert in the underground ground beneath the foundation concrete layer of an underground structure; and A drainage pipe installation step in which a drainage pipe is installed so that one end is connected to the blind culvert installed in the above blind culvert installation step and the other end is exposed above ground; A step for installing an integrated connecting pipe that simultaneously connects the drainage pipes exposed above ground; A sump installation step of installing a sump on the ground to collect groundwater naturally discharged through the above-mentioned integrated connecting pipe; A method for constructing a natural groundwater discharge device comprising: a pump installation step of installing a pump to discharge groundwater collected in the sump to the outside; The above blind culvert installation step further includes the step of installing the blind culvert in the lower underground ground of each column of the underground structure, and A construction method for a natural groundwater discharge device responding to positive pressure in a building, characterized in that the above-mentioned drainage pipe installation step further includes a step in which the drainage pipe is vertically buried inside each column of the underground structure, the lower end is connected to a blind culvert installed in the underground ground, and the upper end exposed above ground is connected to an integrated connecting pipe.

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