Groundwater drainage system of a building

Abstract

The present invention relates to a groundwater drainage device, and more specifically, to a groundwater drainage device for a building that prevents condensation on the finished concrete layer and enhances structural stability by burying horizontal water pipes in the foundation concrete layer to guide groundwater flowing in from a collection section toward a vertical pipe, in order to relieve uplift pressure exerted by groundwater on a civil engineering or architectural structure constructed relatively lower than the groundwater level.

Description

Technology Field

[0001] The present invention relates to a groundwater drainage device, and more specifically, to a groundwater drainage device for a building that prevents condensation on the finished concrete layer and enhances structural stability by burying horizontal water pipes in the foundation concrete layer to guide groundwater flowing in from a collection section toward a vertical pipe, in order to relieve uplift pressure exerted by groundwater on a civil engineering or architectural structure constructed relatively lower than the groundwater level. Background Technology

[0002] Generally, when the final floor of a building structure is installed below the groundwater level, uplift pressure (buoyancy) is generated due to the difference in groundwater head between the space excluded by the building—specifically, between the floor and the underground outer wall. Since this uplift pressure acts as a counterweight to the building's own weight and can cause damage to the structure, it is necessary to regulate the groundwater level.

[0003] In particular, when constructing large-scale buildings such as apartment complexes, underground parking lots have recently become legally mandatory. Furthermore, due to the increasing trend of vehicle ownership among residents and their desire for green spaces, underground parking lots are being located at lower elevations, thereby increasing the impact of uplift pressure caused by groundwater on the buildings. To prevent uplift pressure resulting from fluctuations in groundwater levels from affecting building structures, permanent anchors and dewatering methods are being used.

[0004] As an example of a drainage method, Korean Patent Registration No. 0317530 discloses a system for relieving positive pressure in underground structures, and Registered Utility Model No. 0195274 discloses a vertical drain pipe for preventing buoyancy in underground buildings. The disclosed vertical drain pipe for preventing buoyancy has a structure in which a drain hole is formed in the floor of the foundation slab, a filter pipe is connected through the drain hole and an inlet pipe is installed vertically, and an upper pipe connected to the upper part of the inlet pipe is connected to match the normal groundwater level.

[0005] These buoyancy prevention drain pipes and upper pipes are exposed to the outside, which is aesthetically unpleasing, interferes with internal facilities, and is difficult to maintain.

[0006] Patent Registration No. 0443640 discloses an installation system for a vertical drain pipe for preventing buoyancy in underground buildings. The disclosed drain pipe installation system has a configuration that limits the distance of the vertical drain pipe for discharging groundwater from the outside of the building and the distance from the vertical drain pipe in order to prevent buoyancy in an underground building.

[0007] The applicant has developed and registered a drainage structure and method having active natural drainage to prevent buoyancy accidents in order to relieve uplift pressure acting on a building structure (Registered Patent No. 0461920), an underground drainage structure (Registered Utility Model No. 0271757), and a groundwater drainage device having a reduced overflow occurrence site (Registered Patent No. 0601227).

[0008] In addition, the applicant has developed and registered a groundwater drainage device (Registered Patent Publication No. 10-0710920) capable of improving reliability in pipeline construction for maintaining the groundwater level below the design stability range and constructability in groundwater discharge.

[0009] The above groundwater drainage device comprises a drainage section installed at the bottom of the foundation of a building and equipped with a perforated pipe or drainage plate into which groundwater flows, foundation concrete poured on top of the drainage section, a plurality of vertical connecting pipes installed through the foundation concrete, a plurality of vertical pipes installed adjacent to a column or wall of the building and extending to or below the design stable water level of groundwater, a first horizontal connecting pipe connecting the vertical connecting pipes, a second horizontal connecting pipe connecting the vertical connecting pipes and the vertical pipes, a third horizontal connecting pipe connecting the vertical pipes and a sump, and protective concrete poured on top of the first, second, and third horizontal connecting pipes.

[0010] A group of horizontal connecting pipes extending parallel to each other are connected at an angle or perpendicularly to another group of horizontal connecting pipes extending parallel to each other, depending on the installation location or the size and shape of the area of ​​the building's foundation base between the foundation concrete and the protective concrete.

[0011] These existing drainage facilities had a structure in which horizontal water pipes were exposed on the upper surface of the foundation concrete or installed in a separate protective concrete layer. This exposed structure is vulnerable to upper loads, posing a risk of deformation or damage to the horizontal water pipes, and has the disadvantage of extending construction time due to the need for additional processes after pouring. Furthermore, there was a chronic problem where pipes carrying cold groundwater were located close to the finished surface, causing floor condensation. Prior art literature

[0012] Republic of Korea Registered Patent Publication No. 10-0710920: Groundwater Drainage Device The problem to be solved

[0013] The present invention aims to solve conventional problems by providing a groundwater drainage device for a building that maximizes load resistance by embedding and integrating a horizontal water pipe within the foundation concrete, prevents condensation by ensuring that the cold air of the groundwater is not directly transmitted to the finishing concrete side, and stably fixes the position of the horizontal water pipe against buoyancy and pressure generated during concrete pouring. means of solving the problem

[0014] The groundwater drainage device for a building according to the present invention for achieving the above objective comprises: a collection unit installed on the lower side of the foundation concrete layer of the building to collect groundwater so as to discharge it; and a drainage unit for discharging groundwater through a collection well or a rainwater discharge pipe when the groundwater level in the area where the building is constructed is higher than the design stable water level. The drainage unit comprises: a plurality of first vertical pipes that extend from the collection unit to penetrate the foundation concrete layer and are spaced apart from each other at a predetermined interval; a plurality of second vertical pipes that are installed on the columns or walls of the building and extend within the height range of the design stable water level to discharge groundwater that generates positive pressure; and a plurality of horizontal water passage pipes that are extended to connect the first vertical pipes and the second vertical pipes or to connect the first vertical pipes that are spaced apart from each other, and are extended through the foundation concrete layer so as not to transmit the coldness of the groundwater to the finishing concrete layer poured on top of the foundation concrete.

[0015] The above horizontal water pipe is supported by lower reinforcing bars arranged in the lower part of the foundation concrete layer, and the drainage section preferably further comprises a fixing means for fixing the horizontal water pipe to the lower reinforcing bars or upper reinforcing bars arranged in the upper part of the foundation concrete layer.

[0016] It is preferable that the above horizontal water pipe be positioned between the upper reinforcing bars and the lower reinforcing bars so that its vertical position is constrained.

[0017] It is preferable that the above horizontal water pipe be supported and restrained by a pair of lower reinforcing bars that extend parallel to each other in the longitudinal direction on both lower sides.

[0018] It is preferable that the above drainage section further comprises a reinforcing member through which the above horizontal water pipe passes, and which fills the gap between the above horizontal water pipe, the upper reinforcing bar, and the lower reinforcing bar to increase resistance to vibrations generated during concrete pouring for forming the foundation concrete layer.

[0019] The above reinforcing member may be supported and restrained at both ends by a pair of lower reinforcing bars that are extended in parallel with the horizontal water pipe in between, and the front and rear ends may be restrained by another pair of lower reinforcing bars that are extended spaced apart in the width direction of the horizontal water pipe, thereby fixing the position of the horizontal water pipe.

[0020] The above drainage section may further include a spacer positioned between the horizontal water pipe and the lower reinforcing bar. Effects of the invention

[0021] The groundwater drainage device of the building according to the present invention has the advantage of preventing condensation caused by a temperature difference with the basement floor surface by placing a horizontal water pipe through which cold groundwater flows inside the foundation concrete layer and physically separating it from the finishing concrete layer.

[0022] In addition, the groundwater drainage device of the building according to the present invention has the advantage of preventing deformation or damage to the horizontal water pipe caused by upper loads or impacts of the building by completely embedding and integrating the horizontal water pipe within the foundation concrete layer, thereby ensuring stable groundwater drainage efficiency in the long term.

[0023] In addition, the groundwater drainage device of the building according to the present invention has the advantage of preventing displacement of the horizontal water pipe due to buoyancy or vibration occurring during concrete pouring and accurately maintaining the designed gradient, as the horizontal water pipe is positioned between the upper and lower reinforcing bars arranged to form the foundation concrete layer and is secured to either the upper or lower reinforcing bar.

[0024] In particular, the groundwater drainage device of the building according to the present invention has the advantage of ensuring the straightness and stability of the horizontal water pipe by further increasing resistance to external forces applied by a vibrator during pouring, through a reinforcing member installed around the horizontal water pipe between the upper and lower reinforcing bars and installed in close proximity to or in contact with the upper and lower reinforcing bars, thereby compensating for the gap between the horizontal water pipe and the upper and lower reinforcing bars. Brief explanation of the drawing

[0025] FIG. 1 is a partial perspective view of a groundwater drainage device for a building according to a first embodiment of the present invention, and FIG. 2 is a partial side cross-sectional view of the groundwater drainage device of FIG. 1, and FIG. 3 is a partial side cross-sectional view illustrating the state in which the horizontal water pipe of the groundwater drainage device of FIG. 1 is connected to reinforcing bars embedded in the foundation concrete, and FIG. 4 is a partial cross-sectional view illustrating the state in which the horizontal water pipe of the groundwater drainage device of FIG. 1 is connected to reinforcing bars embedded in the foundation concrete, and FIG. 5 is a partial side cross-sectional view illustrating the horizontal water pipe of the groundwater drainage device of FIG. 1 being supported and fixed by reinforcing bars embedded in the foundation concrete in a different manner, and FIG. 6 is a partial cross-sectional view illustrating the horizontal water pipe of the groundwater drainage device of FIG. 5 supported and fixed by reinforcing bars, and FIG. 7 is a partial perspective view illustrating a state in which a horizontal water passage pipe of a groundwater drainage device according to a second embodiment of the present invention is connected to reinforcing bars embedded in the foundation concrete, and FIG. 8 is a partial perspective view illustrating a state in which a horizontal water pipe of a groundwater drainage device according to a third embodiment of the present invention is fixed between reinforcing bars arranged vertically within the foundation concrete. Specific details for implementing the invention

[0026] Hereinafter, a groundwater drainage device for a building according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0027] FIGS. 1 to 6 illustrate a groundwater drainage device for a building according to a first embodiment of the present invention.

[0028] A groundwater drainage device (10) for a building according to the first embodiment of the present invention comprises: a collection unit (20) installed on the lower ground of the lean concrete layer (110) of the building to collect groundwater so as to discharge it; a drainage unit (40) including a first vertical pipe (41) that is spaced apart at a predetermined interval by vertically penetrating the foundation concrete layer (120) from the collection unit (20), a plurality of second vertical pipes (45) that are installed adjacent to the column or wall (150) of the building and extend to the design stable water level of the groundwater or below, and a horizontal water passage pipe (50) that is extended to connect the first vertical pipe (41) and the second vertical pipe (45) or to connect the first vertical pipes (41) that are spaced apart from each other; A condensation prevention plate (80) is provided, which is positioned on the upper part of the foundation concrete layer (120) to prevent condensation from occurring on the finishing concrete layer (130) above the foundation concrete layer (120).

[0029] The water collection unit (20) is installed on the ground (100) of the building and on the underground side, and comprises a lower nonwoven fabric (21) laid in a predetermined pattern on the ground (100) where the building is constructed, a water collection member forming a water collection space (31) for collecting groundwater on the upper surface of the lower nonwoven fabric (21), an upper nonwoven fabric (25) installed to partition the water collection space (31) on the upper surface of the water collection member, and a protective film (27) that prevents the lower nonwoven fabric (21) and the upper nonwoven fabric (25) from being damaged by concrete for forming a lean concrete layer (110) on the upper surface of the upper nonwoven fabric (25).

[0030] The water collection unit (20) may be applied without the upper nonwoven fabric (25) installed between the protective film (27) and the drainage plate (32).

[0031] The lower nonwoven fabric (21) can be installed in a grid pattern to facilitate the smooth discharge of groundwater after the ground leveling work is completed.

[0032] The above water collection member is provided with a drainage plate (32) that is continuously installed on the upper surface of the lower nonwoven fabric (21).

[0033] The drainage plate (32) has a plate-like structure in which support protrusions (32a) protruding from the upper surface to the lower surface are arranged in a predetermined pattern to secure a groundwater collection space (31).

[0034] It is preferable that the support projection (32a) be drawn in from the upper surface and protrude to the lower surface to form a water collection space for collecting groundwater on the upper and lower sides. If necessary, the drainage plate (32) may be installed in a stacked structure on the upper part of the lower nonwoven fabric (21).

[0035] Additionally, although not shown, the water collection section (20) further includes fixing pins that penetrate and fix the edges of the lower nonwoven fabric (21), upper nonwoven fabric (25), and protective film (27) that overlap each other.

[0036] The width of the protective film (27) is formed to be wider than the width of the lower nonwoven fabric (21) and the upper nonwoven fabric (25) so as to cover the width of both edges of the lower nonwoven fabric (21) and the upper nonwoven fabric (25).

[0037] It is preferable to use the lower nonwoven fabric (21) and the upper nonwoven fabric (25) in such a way that groundwater can flow in smoothly and is prevented from being easily clogged by fine particles of soil. To this end, it is preferable to use nonwoven fabrics with a weight of 150 g / m² to 250 g / m² for the lower nonwoven fabric (21) and the upper nonwoven fabric (25), respectively, and it is preferable to use a polyethylene film for the protective film (27).

[0038] One side of the water collection space (31) formed by drainage plates (32) installed in a predetermined pattern is connected by a first drainage pipe (29), and this first drainage pipe (29) is connected to a first discharge pipe (29a) exposed to the water collection well (11) so as to discharge groundwater from the water collection space (31) to the water collection well (11), and a valve (29b) for controlling the discharged groundwater is installed in this first discharge pipe (29a).

[0039] Alternatively, the horizontal water pipe (56) may be extended from the first vertical pipe (41) so as to be connected to the first discharge pipe (29a) exposed to the sump.

[0040] As described above, the water collection unit (20) configured allows groundwater located on the lower side of the lean concrete layer (110), that is, groundwater acting as positive pressure of the building, to flow into the interior of the water collection space (31) by passing through the lower nonwoven fabric (21) and the upper nonwoven fabric (25). At this time, fine particles carried by the groundwater are filtered by the upper and lower nonwoven fabrics (21) (25).

[0041] Meanwhile, the water collection member is not limited to the structure of the drainage plate (32) as long as it can form a space where water passing through the lower nonwoven fabric (21) is collected, unlike what is depicted.

[0042] The above drainage section (40) has a structure for lowering the groundwater level by discharging the groundwater collected through the collection space (31) through the collection well (11) or the rainwater discharge pipe when the groundwater level acting under positive pressure is above the design stable water level.

[0043] The first vertical pipes (41) are each installed vertically in the lean concrete layer (110), and the lower end is installed to be connected to a water collection space (31) formed by a drainage plate (32) by penetrating the protective film (27) and the upper non-woven fabric (25), and the upper end of the first vertical pipe (41) has a structure protruding from the upper surface of the lean concrete layer (110) and the foundation concrete layer (120).

[0044] The lower end of the first vertical pipe (41) connected to the water collection space (31) may further be provided with an expansion member (42) supported by a drainage plate (32).

[0045] The expansion member (42) can maintain the first vertical pipe (41) in a vertical state when pouring lean concrete and guides the groundwater collected in the collection space (31) to flow smoothly into the first vertical pipe (41). The expansion member (42) can be formed integrally with the first vertical pipe (41).

[0046] It is preferable that the expansion member (42) penetrates the protective film (27) and the upper non-woven fabric (25) and communicates with the lower side of the drainage plate (32) so that groundwater in the water collection space (31) can be smoothly discharged.

[0047] Meanwhile, the horizontal water pipe (50) may be divided into a first horizontal water pipe (51) that extends to the upper side of the first vertical pipe (41) which is extended toward the upper side of the foundation concrete (120) or to the second vertical pipe (45) which is embedded in the foundation concrete (120); and a second horizontal water pipe (56) that extends within the foundation concrete (120) to connect the first vertical pipes (41) which are spaced apart from each other.

[0048] And, a distribution box (60) is installed on the upper side of the first vertical pipes (41) that extend toward the upper surface of the lean concrete layer (110) and the foundation concrete layer (120), and the distribution boxes (60) can be connected to the second vertical pipes (45) and groundwater so that groundwater can be smoothly discharged by the first horizontal water pipes (51).

[0049] Alternatively, unlike what is described, the upper end of the first vertical pipe (41) may be formed to be closed, and the first horizontal water pipe (51) may be extended into the second vertical pipe (45) within the foundation concrete layer (120).

[0050] The first and second horizontal water pipes (51, 56) penetrating the foundation concrete layer (120) are positioned between the upper reinforcing bars (121) and lower reinforcing bars (125) arranged on the upper and lower parts of the foundation concrete layer (120).

[0051] The upper reinforcing bars (121) may be divided into a plurality of first upper reinforcing bars (121a) that are extended in the length direction of the first horizontal water pipe (51) or in the width direction of the second horizontal water pipe (56) and spaced apart from each other; and a plurality of second upper reinforcing bars (121b) that are extended in the width direction of the first horizontal water pipe (51) or in the length direction of the second horizontal water pipe (56) and spaced apart from each other.

[0052] Referring to FIGS. 1 and FIGS. 2, the first upper reinforcing bar (121a) is located below the second upper reinforcing bar (121b), but it may be located above the second upper reinforcing bar (121b) as shown.

[0053] And, the lower reinforcing bars (125) can be divided into a plurality of first lower reinforcing bars (125a) that are extended in the length direction of the first horizontal water pipe (51) or in the width direction of the second horizontal water pipe (56) and are spaced apart from each other; and a plurality of second lower reinforcing bars (125b) that are extended in the width direction of the first horizontal water pipe (51) or in the length direction of the second horizontal water pipe (56) and are spaced apart from each other.

[0054] The first lower reinforcing bar (125a) is located above the second lower reinforcing bar (125b), but unlike what is shown, it may be located below the second lower reinforcing bar (125b).

[0055] The first and second horizontal water pipes (51, 56) may be supported by the first lower reinforcing bar (125a) or the second lower reinforcing bar (125b), and the upper surface may be in contact with the first upper reinforcing bar (121a) or the second upper reinforcing bar (121b).

[0056] The first and second horizontal water pipes (51, 56) are positioned between the upper reinforcing bars (121) and the lower reinforcing bars (125) and are constrained by the upper reinforcing bars (121) and the lower reinforcing bars (125).

[0057] Accordingly, the first and second horizontal water pipes (51, 56) can maintain straightness against the vibration force generated by the vibrator when pouring to form the foundation concrete layer (120), thereby preventing deformation or displacement.

[0058] And, the drainage section (40) further comprises a reinforcing member (61) disposed around the first or second horizontal water pipe (51, 56) between the upper reinforcing bar (121a, 121b) and the lower reinforcing bar (125a, 125b).

[0059] The reinforcing member (61) is installed so that the first or second horizontal water pipe (51, 56) penetrates inwardly and is close to or in contact with the upper reinforcing bar (121a, 121b) and the lower reinforcing bar (125a, 125b).

[0060] By compensating for the gap between the first or second horizontal water pipe (51, 56) and the upper reinforcing bar (121) and lower reinforcing bar (125) by the reinforcing member (61), the resistance of the first or second horizontal water pipe (51, 56) to the vibration force generated by the vibrator can be further increased.

[0061] Additionally, the drainage section (40) further comprises a fixing means for fixing the first or second horizontal water pipe (51, 56) to the lower reinforcing bar (125) or the upper reinforcing bar (121).

[0062] A linear knot member (63), such as a wire or cable tie, can be used as a fastening means.

[0063] The linear knot member (63) ties and secures the first or second horizontal water pipe (51, 56) to the upper reinforcing bar (121) or lower reinforcing bar (125).

[0064] As illustrated, the linear knot member (63) preferably secures the first or second horizontal water pipe (51, 56) by binding the upper reinforcing bar (121) or lower reinforcing bar (125) together with the reinforcing member (61) through which the first or second horizontal water pipe (51, 56) passes.

[0065] Referring to FIGS. 3 and 4, a reinforcing member (61) is supported by a first lower reinforcing bar (125a) or a second lower reinforcing bar (125b) that extends in the width direction of the first horizontal water pipe (51) or the second horizontal water pipe (56), and a linear knot member (63) binds the reinforcing member (61) together with the lower reinforcing bar (125a, 125b), so that the first horizontal water pipe (51) or the second horizontal water pipe (56) can be fixed on the lower reinforcing bar (125a, 125b).

[0066] Alternatively, referring to FIGS. 5 and 6, a reinforcing member (61) may be positioned between a pair of first lower reinforcing bars (125a) or a pair of second lower reinforcing bars (125b) that are extended parallel to the width direction of the first horizontal water pipe (51) or the second horizontal water pipe (56), and both sides of the reinforcing member (61) may be supported and restrained between a pair of second lower reinforcing bars (125b) or a pair of first lower reinforcing bars (125a) that are extended parallel to the first horizontal water pipe (51) or the second horizontal water pipe (56), so that the first horizontal water pipe (51) or the second horizontal water pipe (56) may be fixed on the lower reinforcing bars (125a, 125b).

[0067] Although not shown in FIGS. 5 and 6, a linear knot member (63) may be installed to bind the reinforcing member (61) together with a pair of second lower reinforcing bars (125b) or first lower reinforcing bars (125a) that are parallel in the longitudinal direction of the first horizontal water pipe (51) or the second horizontal water pipe (56).

[0068] Alternatively, without a reinforcing member (61), the lower portions of both longitudinal sides of the first horizontal water pipe (51) or the second horizontal water pipe (56) may be directly supported and fixed by being supported by a pair of first lower reinforcing bars (125a) or second lower reinforcing bars (125b) that are extended parallel to each other.

[0069] Meanwhile, it is preferable to use a PVC pipe with a diameter of 50 to 150 mm for the first vertical pipe (41). The first and second horizontal water pipes (51, 56) may also use PVC pipes with a diameter of 50 to 150 mm.

[0070] However, when the first horizontal water pipe (51) extends to the second vertical pipe (45) from the upper end of the first vertical pipes (41) that extend toward the upper surface of the foundation concrete layer (120), the first horizontal water pipe (51) is preferably a PVC pipe of 20 to 50 mm, taking into account the connection relationship with the condensation prevention plate (80) described later.

[0071] And preferably, the spacing of the first vertical pipe (41) is maintained at intervals of 7m to 80m, taking into account the positive pressure caused by groundwater.

[0072] The second vertical pipe (45) is installed at a certain height from the floor surface of the underground space.

[0073] It is preferable to install the second vertical pipe (45) at a height lower than the design stable water level of the groundwater to protect the building from groundwater.

[0074] These second vertical pipes (45) are preferably installed adjacent to the underground wall or column (150) of the building, but are not limited thereto.

[0075] A plurality of second vertical pipes (45) can be divided into a low-level vertical pipe (46) for discharging groundwater above the low level of the groundwater design stable level and a high-level vertical pipe (47) for discharging groundwater above the high level of the groundwater design stable level.

[0076] It is desirable that the height difference between the low water level vertical pipe (46) and the high water level vertical pipe (47) be maintained at a set interval.

[0077] Meanwhile, the low water level vertical pipe (46) and the high water level vertical pipe (47) may each be equipped with a first and second overflow drainage pipe (not shown) to discharge groundwater overflowing from them toward the sump or drainage pipe. It is preferable that the low water level vertical pipe (46) be installed on the side adjacent to the sump (11) so that the overflow water discharged through the low water level vertical pipe (46) can be discharged toward the sump (11).

[0078] The low water level vertical pipe (46) and the high water level vertical pipe (47) may each be made of PVC pipes with a diameter of 20 to 150 mm. When the low water level vertical pipe (46) and the high water level vertical pipe (47) are each made of pipes with a diameter of 50 mm or less, multiple pipes may be installed in parallel.

[0079] The diameters of the low-water level vertical pipe (46) and the high-water level vertical pipe (47) and the horizontal water pipe (70) can be installed taking into account the soil quality, groundwater volume, and excavation depth of the underground layer in the area where the building is installed, and it is preferable to maintain the spacing of the second vertical pipes (45) at 7m to 80m through experiments described later. When the second vertical pipe (45) consists of the low-water level vertical pipe (46) and the high-water level vertical pipe (47), it is preferable to install them within the spacing range.

[0080] Meanwhile, a condensation prevention plate (80) is installed on the upper surface of the foundation concrete layer (120), and a finishing concrete layer (130) forming the floor surface of the basement is formed on the upper surface of the condensation prevention plate (80).

[0081] As shown in FIGS. 1 and 2, the condensation prevention plate (80) is installed with condensation prevention protrusions (82) that protrude from the upper surface to the lower surface of the plate-shaped main body (80).

[0082] An expansion portion (not shown) may be installed at the end of the condensation prevention projection (82) to prevent the condensation prevention plate (80) from tilting due to irregularities on the upper surface of the base concrete layer (120).

[0083] It is preferable that the spacing between the condensation prevention protrusions (82) protruding from the lower surface of the above condensation prevention plate (80) and the length (82) of the condensation prevention protrusions be formed wider than the outer diameter of the first horizontal water pipe (51) so as not to come into contact with the outer surface of the first horizontal water pipe (51) extending above the foundation concrete layer.

[0084] In addition, considering interference when installing the first horizontal water pipe (51) through the gaps between the condensation prevention protrusions (82), it is preferable to make the length of the condensation prevention protrusions (82) larger than the outer diameter of the first horizontal water pipe (51) so that they do not come into contact with the lower surface of the condensation prevention plate body of the first horizontal water pipe (51).

[0085] In the groundwater drainage device of a building according to the first embodiment of the present invention configured as described above, the groundwater level around the underground building structure rises during the rainy season or floods, and this groundwater flows into the collection unit (20). The groundwater thus flowing in overflows into the relatively lower second vertical pipe (46) through the first vertical pipe (41) and the first and second horizontal water pipes (51, 55) and is discharged into the collection well (11). The groundwater flowing into the collection unit (20) is drained until it reaches a level below the design stable water level.

[0086] The groundwater drainage device (10) of a building according to the first embodiment of the present invention described above has the advantage of preventing condensation caused by a temperature difference with the floor surface of the basement by placing a horizontal water pipe (51, 56) through which cold groundwater flows inside the foundation concrete layer (120) and physically separating it from the finishing concrete layer (130).

[0087] In addition, the groundwater drainage device (10) of a building according to the first embodiment of the present invention has the advantage of preventing deformation or damage to the horizontal water pipes (51, 56) caused by the upper load of the building by completely embedding the horizontal water pipes (51, 56) inside the foundation concrete layer (120) and integrating them with the foundation concrete layer (120), thereby ensuring stable groundwater drainage efficiency.

[0088] In addition, the groundwater drainage device (10) of a building according to the first embodiment of the present invention has the advantage of preventing displacement of the horizontal water pipes (51, 56) due to buoyancy or vibration occurring during concrete pouring and accurately maintaining the designed gradient, as the horizontal water pipes (51, 56) are arranged between the upper reinforcing bar (121) and the lower reinforcing bar (125) to form the foundation concrete layer (120) and are connected to the upper reinforcing bar (121) or the lower reinforcing bar (125).

[0089] In particular, the groundwater drainage device (10) of a building according to the first embodiment of the present invention has the advantage of ensuring the straightness and stability of the horizontal water pipe (51, 56) by further increasing the resistance to external forces applied by a vibrator during pouring, through a reinforcing member (61) installed around the horizontal water pipe (51, 56) between the upper reinforcing bar (121) and the lower reinforcing bar (125) and installed in close proximity to or in contact with the upper and lower reinforcing bars (121, 125), thereby compensating for the gap between the horizontal water pipe (51, 56) and the upper and lower reinforcing bars (121, 125).

[0090] Meanwhile, FIG. 7 illustrates a groundwater drainage device for a building according to a second embodiment of the present invention. Components having the same function as those in the previously illustrated drawings are indicated by the same reference numerals.

[0091] The drainage section (20) may be provided with a spacer (66) placed between the first or second horizontal water pipe (51, 56) and the lower reinforcing bar (125a, 125b) without a reinforcing member (61).

[0092] The linear knot member (63) is installed to bind together the lower reinforcing bar (125a, 125b), the spacer (66), and the first or second horizontal water pipe (51, 56).

[0093] The groundwater drainage device of a building according to the second embodiment of the present invention has the advantage of being able to more precisely secure a drainage gradient designed to allow groundwater to flow into a sump by installing a spacer (66) between the first and second horizontal water pipes (51, 56) and the lower reinforcing bar (125).

[0094] In addition, the groundwater drainage device of a building according to the second embodiment of the present invention can prevent the first and second horizontal water pipes (51, 56) from being locally compressed or deformed by dispersing the self-weight of the first and second horizontal water pipes (51, 56) or the pressure during pouring to the lower reinforcing bar (125) through the spacer (66).

[0095] Meanwhile, FIG. 8 illustrates a groundwater drainage device for a building according to a third embodiment of the present invention. Components having the same function as those in the previously illustrated drawings are indicated by the same reference numerals.

[0096] The groundwater drainage device of a building according to the third embodiment of the present invention may be applied so that the first or second horizontal water pipe (51, 56) can be directly connected to the upper reinforcing bar (121a, 121b) or lower reinforcing bar (125a, 125b) by means of a linear knot member (63) without a reinforcing member (61) or a spacer (66).

[0097] The groundwater drainage device of a building according to the third embodiment of the present invention has the advantage that the horizontal water pipe (51, 56) is fixed in close contact between the upper reinforcing bar (121) and the lower reinforcing bar (125), so the reinforcing bar structure directly resists buoyancy or vibration generated during pouring, thereby effectively suppressing the flow of the pipe. Explanation of the symbols

[0098] 10: Groundwater drainage system for buildings 20: Catchment area 40: Drainage area 41: 1st vertical pipe 45: 2nd vertical pipe 46: Low water level vertical pipe 47: High water level vertical pipe 50: Horizontal water pipe 61: Reinforcement member 63: Linear knot member 66: Spacer 80: Condensation prevention plate 121: Top reinforcement 125: Bottom reinforcement

Claims

Claim 1 A collection unit installed on the lower side of the foundation concrete layer of a building to collect groundwater for discharge; and a drainage unit for discharging groundwater through a collection well or rainwater discharge pipe when the groundwater level in the area where the building is constructed is higher than the design stable water level; wherein the drainage unit comprises a plurality of first vertical pipes extending from the collection unit to penetrate the foundation concrete layer and spaced apart from each other at a predetermined interval; and a plurality of second vertical pipes installed on a column or wall of the building and extending within the height range of the design stable water level to discharge groundwater that generates positive pressure; A plurality of horizontal water pipes that are extended to connect the first vertical pipe and the second vertical pipe, or extended to connect the first vertical pipes that are spaced apart from each other, and are extended through the foundation concrete layer so as not to transmit the cold of the groundwater to the finishing concrete layer poured on top of the foundation concrete layer, and are supported by lower reinforcing bars arranged in the lower part of the foundation concrete layer; a fixing means for fixing the horizontal water pipes to the lower reinforcing bars or upper reinforcing bars arranged on top of the foundation concrete layer; and a reinforcing member through which the horizontal water pipes pass, and which fills the gap between the horizontal water pipes, the upper reinforcing bars, and the lower reinforcing bars to increase resistance to vibrations generated during concrete pouring for forming the foundation concrete layer; wherein the reinforcing member is supported and restrained at both ends by a pair of lower reinforcing bars that are extended in length parallel with the horizontal water pipes in between, and is positioned between another pair of lower reinforcing bars that are extended in the width direction of the horizontal water pipes, and the A groundwater drainage device for a building characterized by fixing the position of the horizontal water pipe. Claim 2 delete Claim 3 A groundwater drainage device for a building according to claim 1, characterized in that the fixing means comprises a linear knot member installed to bind the reinforcing member together with a pair of lower reinforcing bars parallel in the longitudinal direction of the horizontal water pipe. Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 A groundwater drainage device for a building according to claim 1, characterized in that the horizontal water pipe is positioned between the upper reinforcing bars and the lower reinforcing bars so that its vertical position is restricted.

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