KR102693177B1 - Permanent drainage system - Google Patents

Abstract

A permanent drainage system is disclosed. The permanent drainage system is constructed along a drainage line designed in advance on a foundation construction reference plane, and includes a main drainage pipe having both ends of an extended length connected to a collection well; and a drain board arranged at a predetermined interval along the longitudinal direction of the main drainage pipe and connected to the main drainage pipe in a fluid communication manner, wherein the main drainage pipe includes a main body portion having a semicircular cross-sectional structure; a plate-shaped reinforcing portion protruding vertically or horizontally from an inner surface of the main body portion and extending along the longitudinal direction of the main body portion; and a plurality of protruding reinforcing portions arranged in a circumferential direction of the semicircular shape on the inner or outer surface of the main body portion, wherein the drainage board includes an upper plate having a square plate shape and including a drainage expansion portion extending in one direction at a center point and convexly formed in an arch shape; A plurality of support pillars arranged longitudinally and transversely on one surface of the upper plate, protruding in a cup cross-section shape from the upper plate in a direction opposite to the protrusion direction of the drainage expansion portion, and distributed on both sides of the drainage expansion portion; a plurality of edge support reinforcing plates protruding in a plate shape from two parallel sides of the edges of the upper plate in a direction in which the support pillars protrude, and having a length such that their terminals are positioned on the same plane as the terminals of the plurality of support pillars; and a plate-shaped vertical plate portion protruding from a concave surface of the drainage expansion portion in the protrusion direction of the plurality of support pillars and extending in the longitudinal direction of the drainage expansion portion, and a horizontal plate portion formed at an end of the vertical plate portion to be arranged perpendicular to the vertical plate portion and extending in the longitudinal direction of the vertical plate portion, wherein a lower surface of the horizontal plate portion includes a central support reinforcing plate positioned on the same plane as the terminals of the plurality of support pillars.

Description

PERMANENT DRAINAGE SYSTEM

The present invention relates to a permanent drainage system, and more specifically, to a permanent drainage system installed in the lower ground of an underground structure for draining groundwater for the construction of civil engineering and architectural underground structures.

In general, for the construction of civil engineering and architectural underground structures, excavation work is carried out to a certain depth, and a foundation structure is formed on the ground (floor surface) where the excavation is completed, and civil engineering or architectural structures are constructed based on this foundation structure.

When groundwater infiltrates the above-mentioned foundation structure, the groundwater acts as buoyancy and positive pressure on the underground structure (building), and this buoyancy and positive pressure acts as a force that lifts the underground structure (building) due to the difference in water head between the bottom of the underground structure (building) and the surrounding groundwater level.

Therefore, at construction sites for civil engineering and architectural structures with underground floors, as a countermeasure against buoyancy and positive pressure due to groundwater, the thickness of the foundation of the underground structure is increased, rock anchors are installed to resist buoyancy and positive pressure, or drainage pipes are installed in the foundation structure to collect and drain groundwater, thereby reducing buoyancy and positive pressure.

Recently, a permanent drainage method that drains groundwater into a collection well by installing drainage pipes in the foundation structure has been widely used.

Briefly explaining the structure of this conventional permanent drainage method, a permanent drainage device is constructed between two collecting wells, the first geotextile is installed on the foundation construction reference plane, a main drainage pipe is installed in the center of the first geotextile so as to be connected to both collecting wells via a socket, and a drain board for collecting water is inserted and installed in each hollow pipe of the socket.

After the construction of this permanent drainage device, the waste concrete and concrete are poured and cured to form the floor foundation. At this time, the waste concrete applies a vertical load to the main drain pipe and drain board, and there is a disadvantage that the main drain pipe and drain board may be deformed due to the vertical load, which may reduce drainage efficiency.

Registered Patent 10-0616123

Therefore, the problem that the present invention seeks to solve is to provide a permanent drainage system that minimizes deformation due to vertical load and minimizes reduction in drainage efficiency.

According to one embodiment of the present invention, a permanent drainage system comprises: a main drainage pipe constructed along a drainage line designed in advance on a foundation construction reference plane, both ends of an extended length being connected to a collection well; and a drainage board arranged at a predetermined interval along the longitudinal direction of the main drainage pipe and fluidly connected to the main drainage pipe, wherein the main drainage pipe comprises: a main body portion having a semicircular cross-sectional structure; a plate-shaped reinforcing portion protruding vertically or horizontally from an inner surface of the main body portion and extending along the longitudinal direction of the main body portion; and a plurality of protruding reinforcing portions arranged in a circumferential direction of the semicircular shape on the inner or outer surface of the main body portion, wherein the drainage board comprises: an upper plate portion having a square plate shape, a drainage extension portion extending in one direction at a center point and convexly formed in an arch shape; A plurality of support pillars arranged longitudinally and transversely on one surface of the upper plate, protruding in a cup cross-section shape from the upper plate in a direction opposite to the protrusion direction of the drainage expansion portion, and distributed on both sides of the drainage expansion portion; a plurality of edge support reinforcing plates protruding in a plate shape from two parallel sides of the edges of the upper plate in a direction in which the support pillars protrude, and having a length such that their terminals are positioned on the same plane as the terminals of the plurality of support pillars; and a plate-shaped vertical plate portion protruding from a concave surface of the drainage expansion portion in the protrusion direction of the plurality of support pillars and extending in the longitudinal direction of the drainage expansion portion, and a horizontal plate portion formed at an end of the vertical plate portion to be arranged perpendicular to the vertical plate portion and extending in the longitudinal direction of the vertical plate portion, wherein a lower surface of the horizontal plate portion includes a central support reinforcing plate positioned on the same plane as the terminals of the plurality of support pillars.

In one embodiment, the plate-shaped reinforcing member protrudes vertically and extends shorter than the protruding length of the plurality of support columns; the protruding reinforcing member may be formed in a convex relief shape in a semicircular shape from the inner or outer surface of the main body portion, or in a negative shape that is concave on one surface of the inner or outer surface of the main body portion and protrudes toward the other surface.

In one embodiment, the plate-shaped reinforcing member protrudes vertically and extends shorter than the protruding lengths of the plurality of support columns; the main drain pipe may have a relief-shaped protruding reinforcing member formed in a convex shape in a semicircular shape from the inner or outer surface of the main body portion, and a concave-shaped protruding reinforcing member that is concave on one surface of the inner or outer surface of the main body portion and protrudes toward the other surface, and may be arranged in the circumferential direction of the semicircular shape.

In one embodiment, the plate-shaped reinforcing member protrudes vertically and is the same as the protruding length of the plurality of support columns; the main drain pipe further includes a pair of fluid flow rate increasing guides arranged on both sides of the plate-shaped reinforcing member protruding vertically, the fluid flow rate increasing guides including: a first guide member extending linearly by a predetermined length and facing the plate-shaped reinforcing member at a predetermined interval; and a second guide member extending linearly by a predetermined length and eccentrically positioned from an end of the first guide member through a bending region that bends to the left or right, and facing the plate-shaped reinforcing member at a distance greater than the interval by which the plate-shaped reinforcing member and the first guide member are separated, wherein the fluid flow rate increasing guides can be arranged in plurality along the longitudinal direction of the main drain pipe.

The permanent drainage system according to the present invention has the following advantages.

First, the main drain pipe is reinforced in strength through plate-shaped reinforcing members and multiple protruding reinforcing members, and the drain board is reinforced in strength through multiple edge support reinforcing plates and central support reinforcing plates, so that deformation due to vertical load applied to the main drain pipe and drain board can be minimized, and furthermore, reduction in drainage efficiency can be minimized.

That is, the main drain pipe can stably maintain its semicircular shape, and the drain board can stably maintain the equilibrium state of the top plate, thereby minimizing the decrease in drainage efficiency.

Second, when multiple protruding reinforcing members are formed in a negative shape, there is an advantage in that the drainage area of the main drain pipe increases, thereby increasing drainage efficiency.

Third, when the plate-shaped reinforcement part of the main drain pipe is formed to protrude horizontally, the main drain pipe is prevented from being deformed in the left-right direction due to being pressed by a vertical load, making it easy to maintain the shape of the main drain pipe, and further preventing a decrease in water flow efficiency.

FIG. 1 is a drawing for explaining the configuration of a permanent drainage system according to one embodiment of the present invention.
FIGS. 2A to 2F and FIGS. 3A to 3D are drawings showing various embodiments of a main drain pipe of a permanent drainage system according to one embodiment of the present invention.
FIGS. 4 to 7 are drawings showing examples of drain boards of a permanent drainage system according to one embodiment of the present invention.
Figure 8 is a front view showing the configuration of a main drain pipe of a permanent drainage system according to another embodiment of the present invention.
Figure 9 is a cross-sectional view taken along line A-A' of Figure 8.

Hereinafter, a permanent drainage system according to an embodiment of the present invention will be described in detail with reference to the attached drawings. The present invention can be modified in various ways and can have various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention. In describing each drawing, similar reference numerals are used for similar components. In the attached drawings, the dimensions of structures are illustrated larger than actual dimensions in order to ensure clarity of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless expressly defined in this application.

FIG. 1 is a drawing for explaining the configuration of a permanent drainage system according to one embodiment of the present invention.

Referring to FIG. 1, a permanent drainage system according to one embodiment of the present invention may include a floor geotextile (100), a main drainage pipe (200), a drain board connection socket (300), and a drain board (400).

The floor geotextile (100) is placed on the foundation construction reference plane of civil engineering and architectural underground structures.

The main drainage pipe (200) is constructed along a drainage line designed in advance on the basic construction reference plane. At this time, the main drainage pipe (200) is installed above the floor geotextile (100), and can be installed while multiple pipes are connected through connecting sockets, and both sides in the longitudinal direction can be connected to a collection well (10).

The drain board connection socket (300) can be arranged between a plurality of adjacent main drain pipes (200), and can include a main drain pipe socket portion to which the plurality of main drain pipes (200) are connected, and a drain board socket portion to which the drain board (400) is connected. The main drain pipe socket portion and the drain board socket portion can be formed to be in fluid communication with each other. Accordingly, a plurality of main drain pipes (200) and a plurality of drain boards (400) connected to the drain board connection socket (300) can be connected to each other in fluid communication.

Drain boards (400) are arranged at regular intervals along the length of the main drain pipe (200) and can be connected to the main drain pipe (200) in a fluid communication manner through a drain board connection socket (300).

FIGS. 2A to 2F and FIGS. 3A to 3D are drawings showing various embodiments of a main drain pipe of a permanent drainage system according to one embodiment of the present invention.

Referring to FIGS. 2A to 2F and FIGS. 3A to 3D, the main drain pipe (200) may include a main body portion (210), a plate-shaped reinforcing portion (220), and a plurality of protruding reinforcing portions (230).

The main body part (210) has a predetermined length, a semicircular cross-sectional structure, and a bottom part (211) extending horizontally is formed at both ends of the semicircular shape.

The plate-shaped reinforcing member (220) protrudes vertically in a plate shape from the inner surface of the main body member (210) and can extend along the longitudinal direction of the main body member (210). At this time, the plate-shaped reinforcing member (220) can extend shorter than the radius of the semicircle shape.

A plurality of protruding reinforcing members (230) can be arranged in a semicircular shape in a circumferential direction on the inner or outer surface of the main body member (210).

For example, as shown in FIG. 2a, a plurality of protruding reinforcing members (230) may be formed in a convex relief shape of a semicircle on the outer surface of the main body (210), and there may be two of them, and they may be arranged on both sides of the plate-shaped reinforcing member (220).

As another example, as illustrated in FIG. 2b, a plurality of protruding reinforcing members (230) may be formed in a convex relief shape of a semicircle on the inner surface of the main body (210), and there may be two of them, and they may be arranged on both sides of the plate-shaped reinforcing member (220).

As another example, as illustrated in FIG. 2c, a plurality of protruding reinforcing members (230) may be formed in a convex relief shape of a semicircle on the inner surface of the main body part (210) and may be arranged along the circumferential direction throughout the circumferential direction of the semicircular shape of the main body part (210).

As another example, as illustrated in FIG. 2d, a plurality of protruding reinforcing members (230) may be formed in a concave shape on the inner surface of the main body (210) and in a negative shape protruding toward the outer surface, and there may be two of them, and they may be arranged on both sides of the plate-shaped reinforcing members (220).

As another example, as illustrated in FIG. 2e, a plurality of protruding reinforcing members (230) may be formed in a concave shape on the outer surface of the main body part (210) and protruding inwardly, and may be arranged along the circumferential direction throughout the circumferential direction of the semicircular shape of the main body part (210).

As another example, as illustrated in FIG. 2f, a plurality of protruding reinforcing members (230) may be arranged along the circumferential direction of the semicircular shape of the main body (210) in an alternating manner, with n negative protruding reinforcing members (230) and n+1 positive protruding reinforcing members (230) protruding from the inner surface of the main body (210).

Meanwhile, as illustrated in FIG. 3a, the plate-shaped reinforcing member (220) may be formed in a plate shape that protrudes horizontally from the upper portion of the inner surface of the main body part (210), and a plurality of protruding reinforcing members (230) may be formed in a convex relief shape in a semicircular shape on the inner surface of the main body part (210). In this case, the plate-shaped reinforcing member (220) may have an opening (222) formed in the center thereof along the longitudinal direction of the main body part (210).

For example, the opening (222) may be continuous along the length of the main body portion (210) as illustrated in FIG. 3a.

As another example, although not shown, the openings (222) may be formed to be arranged in a manner that they are cut at a certain length along the length direction of the main body (210).

As another example, the opening (222) may be formed in a circular shape and arranged along the length direction of the main body (210) as shown in FIG. 3b.

Meanwhile, as shown in FIGS. 3c and 3d, the plate-shaped reinforcing member (220) can be formed like the plate-shaped reinforcing member (220) shown in FIG. 3a, and a plurality of protruding reinforcing members (230) can be formed in a concave shape on the outer surface of the main body part (210) and protruding toward the inner surface.

FIGS. 4 and 5 are drawings showing examples of drain boards of a permanent drainage system according to one embodiment of the present invention.

Referring to FIGS. 4 and 5, the drain board (400) may include a top plate (410), a plurality of support columns (420), a plurality of edge support reinforcing plates (430), and a center support reinforcing plate (440).

The upper part (410) has a square plate shape and may include a drainage expansion part (411) that extends in one direction from the center point and is formed convexly in an arch shape.

A plurality of support columns (420) are arranged longitudinally and transversely on one side of the upper plate (410), and protrude in a cup-shaped cross-section from the upper plate (410) in a direction opposite to the protrusion direction of the drainage expansion portion (411), and can be distributed on both sides of the drainage expansion portion (411).

A plurality of edge support reinforcing plates (430) may be formed to have a plate shape that protrudes from two sides of the upper plate (410) that are parallel to each other in the direction in which the support columns (420) protrude, and have a length such that the end portions are positioned on the same plane as the end portions of the plurality of support columns (420).

For example, as illustrated in FIG. 4, a plurality of support columns (420) may be formed in a circular cup shape.

As another example, as illustrated in FIG. 5, a plurality of support columns (420) may be configured in a form in which a square column having a square bottom part and a column having a circular cup shape are combined.

The central support reinforcing plate (440) protrudes from the concave surface of the drainage expansion portion (411) toward the protruding direction of the plurality of support columns (420), and may include a vertical plate portion (441) and a horizontal plate portion (442). The vertical plate portion (441) may be formed in a plate shape extending in the longitudinal direction of the drainage expansion portion (411), and the horizontal plate portion (442) may be formed at an end of the vertical plate portion (441) to be arranged perpendicular to the vertical plate portion (441) and may extend in the longitudinal direction of the vertical plate portion (441). At this time, the lower surface of the horizontal plate portion (442) may be formed to be positioned on the same plane as the end portions of the plurality of support columns (420).

Meanwhile, referring to FIG. 6, the upper plate (410) may include a plurality of first reinforcing protrusions (412) that extend in the arrangement direction of the plurality of support columns (420) between the rows in which the plurality of support columns (420) are arranged and protrude in a semicircular shape, and a plurality of second reinforcing protrusions (413) that are formed along the longitudinal direction on the protruding outer surface of the drainage expansion portion (411).

The permanent drainage system according to one embodiment of the present invention has the following advantages.

First, the main drain pipe (200) is reinforced in strength through a plate-shaped reinforcing member (220) and a plurality of protruding reinforcing members (230), and the drain board (400) is reinforced in strength through a plurality of edge support reinforcing plates (430) and a center support reinforcing plate (440), so that deformation due to a vertical load applied to the main drain pipe (200) and the drain board (400) can be minimized, and further, reduction in drainage efficiency can be minimized.

That is, the main drain pipe (200) can stably maintain its semicircular shape, and the drain board (400) can stably maintain the equilibrium state of the upper plate (410) to minimize the decrease in drainage efficiency.

Second, when multiple protruding reinforcing members (230) are formed in a negative shape, there is an advantage in that the drainage area of the main drain pipe (200) increases, thereby increasing drainage efficiency.

Third, when the plate-shaped reinforcing member (220) of the main drain pipe (200) is formed to protrude horizontally, the main drain pipe (200) is prevented from being deformed in the left-right direction due to being pressed by a vertical load, thereby easily maintaining the shape of the main drain pipe (200), and further, the water passage efficiency can be prevented from being reduced.

FIG. 8 is a front view showing the configuration of a main drainage pipe of a permanent drainage system according to another embodiment of the present invention, and FIG. 9 is a cross-sectional view taken along line A-A' of FIG. 8.

Referring to FIGS. 8 and 9, the main drain pipe (200) of the permanent drainage system according to another embodiment of the present invention may further include a pair of fluid flow rate increasing guides (240).

A pair of fluid flow rate increasing guides (240) are arranged on both sides of a plate-shaped reinforcing member (220) protruding in the vertical direction of the main drain pipe (200), and can be arranged in multiple numbers along the longitudinal direction of the main drain pipe (200).

Each fluid flow rate increasing guide (240) includes a first guide part (241) and a second guide part (242).

The first guide part (241) is extended in a straight line to a certain length and faces the plate-shaped reinforcing part (220) at a certain interval.

The second guide portion (242) is positioned eccentrically from the end of the first guide portion (241) through a bending region (243) that is bent to the left or right from the end of the first guide portion (241) and extends in a straight line of a certain length, and faces the plate-shaped reinforcement portion (220) at a distance greater than the distance between the plate-shaped reinforcement portion (220) and the first guide portion (241).

These pair of fluid velocity increasing guides (240) face the plate-shaped reinforcing member (220), and the first guide member (241) is arranged at a narrower interval than the plate-shaped reinforcing member (220) and the second guide member (242), and the second guide member (242) is arranged at a wider interval than the plate-shaped reinforcing member (220) and the first guide member (241). Accordingly, the velocity increases between the first guide member (241) and the plate-shaped reinforcing member (220).

Therefore, the permanent drainage system according to another embodiment of the present invention has a pair of fluid flow rate increasing guides (240) provided in the main drainage pipe (200), so that the flow of groundwater drained along the length of the main drainage pipe (200) is accelerated, thereby further increasing the drainage efficiency of the permanent drainage system.

Meanwhile, in a permanent drainage system according to one embodiment of the present invention, a contamination-resistant coating layer made of a contamination-preventing coating composition can be applied to the surfaces of the main drain pipe (200) and the drain board (400) to improve contamination resistance.

The above-mentioned anti-fouling coating composition contains sodium sulfate and alkyl ethoxylate ether in a molar ratio of 1:0.01 to 1:2, and the total content of sodium sulfate and alkyl ethoxylate ether is 1 to 12 wt% based on the total aqueous solution.

The above sodium sulfate and alkyl ethoxylate ether are preferably used in a molar ratio of 1:0.01 to 1:2. If the molar ratio is outside the above range, there is a problem in that the applicability on the main drain pipe (200) and drain board (400) is reduced or the moisture absorption on the surface increases after application, resulting in the removal of the application film.

The above sodium sulfate and alkyl ethoxylate ether are preferably present in an amount of 1 to 12 wt% of the total aqueous composition. If the amount is less than 1 wt%, there is a problem that the applicability on the main drain pipe (200) and the drain board (400) is reduced, and if the amount exceeds 12 wt%, crystal precipitation is likely to occur due to an increase in the thickness of the coating film.

Meanwhile, as a method of applying the composition for coating the inner contamination resistance onto the main drain pipe (200) and the drain board (400), it is preferable to apply it by spraying. In addition, the final coating film thickness on the main drain pipe (200) and the drain board (400) is preferably 900 to 2300 Å. If the thickness of the coating film is less than 900 Å, there is a problem of deterioration in the case of high-temperature heat treatment, and if it exceeds 2300 Å, there is a disadvantage of easy occurrence of crystal precipitation on the coating surface.

In addition, the composition for coating the present invention for anti-pollution properties can be prepared by adding 0.1 mol of sodium sulfate and 0.05 mol of alkyl ethoxylate ether to 1000 ml of distilled water and then stirring.

The reason why the ratio of the above components and the thickness of the coating film are numerically limited as above is that the inventor of the present invention analyzed the test results through repeated failures and showed the optimal anti-pollution coating effect at the above ratio.

Meanwhile, in a permanent drainage system according to one embodiment of the present invention, when the drain board (400) is inserted into the drain board connection socket (300) and connected, an adhesive improving agent may be applied between the surfaces where the drain board (400) and the connection socket (300) come into contact to improve adhesion.

The adhesion promoter can be composed of 68 parts by weight of water, 10 parts by weight of styrene, 15 parts by weight of sodium alkylaryl sulfonate, 4 parts by weight of ammonium persulfate, and 3 parts by weight of sodium bicarbonate.

Styrene is added to provide adhesion and bonding properties, sodium alkylaryl sulfonate acts as a surfactant, ammonium persulfate acts as a catalyst, and sodium bicarbonate acts as a buffer.

The reason for limiting the composition and components and limiting the numerical value of the mixing ratio as described above is that the inventor analyzed the test results through repeated failures and found that the optimal effect was achieved at the limited ratio of the components and numerical value.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the invention is not intended to be limited to the disclosed embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

100: Floor geotextile 200: Main drain pipe
300: Drain board connection socket 400: Drain board

Claims (5)

A main drainage pipe (200) constructed along a pre-designed drainage line on the basic construction standard plane, with both ends of the extended length connected to a collection well; and
It includes a drain board (400) arranged at regular intervals along the length of the main drain pipe (200) and connected in a fluid communication manner with the main drain pipe (200).
The above main drain pipe (200) is
A main body part (210) having a semicircular cross-sectional structure;
A plate-shaped reinforcing member (220) that protrudes vertically or horizontally from the inner surface of the main body part (210) and extends along the longitudinal direction of the main body part (210); and
It includes a plurality of protruding reinforcing parts (230) arranged in a circumferential direction of the semicircular shape on the inner or outer surface of the main body part (210),
The above drain board (400) is
An upper portion (410) having a square plate shape and including a drainage expansion portion (411) extending in one direction from the center point and formed convexly in an arch shape;
A plurality of support pillars (420) arranged longitudinally and transversely on one side of the upper plate (410), protruding in a cup-shaped cross-section from the upper plate (410) in a direction opposite to the protrusion direction of the drainage expansion portion (411), and distributed on both sides of the drainage expansion portion (411);
A plurality of edge support reinforcing plates (430) protruding in a plate shape from two sides of the upper plate (410) that are parallel to each other in the direction in which the support columns (420) protrude, and having a length such that the end portions are positioned on the same plane as the end portions of the plurality of support columns (420); and
A vertical plate portion (441) in the shape of a plate that protrudes from the concave surface of the drainage expansion portion (411) toward the protrusion direction of the plurality of support columns (420) and extends in the longitudinal direction of the drainage expansion portion (411), and a horizontal plate portion (442) formed at an end of the vertical plate portion (441) to be arranged perpendicularly to the vertical plate portion (441) and extending in the longitudinal direction of the vertical plate portion (441), characterized in that the lower surface of the horizontal plate portion (442) includes a central support reinforcing plate (440) positioned on the same plane as the end portions of the plurality of support columns (420).
Permanent drainage system. In the first paragraph,
The above plate-shaped reinforcing member (220) protrudes vertically;
The above-mentioned protruding reinforcing member (230) is formed in a convex, semicircular shape from the inner or outer surface of the main body part (210), or is formed in a concave shape on one of the inner and outer surfaces of the main body part (210) and protruding to the other surface.
Permanent drainage system. In the first paragraph,
The above plate-shaped reinforcing member (220) protrudes vertically;
The above main drain pipe (200) is formed with a convex relief shape in a semicircular shape from the inner or outer surface of the main body part (210) and a concave relief reinforcing part (230) that is concave on one surface of the inner or outer surface of the main body part (210) and protrudes toward the other surface, and is arranged in the circumferential direction of the semicircular shape.
Permanent drainage system. In the first paragraph,
The above plate-shaped reinforcing member (220) protrudes vertically and has the same protruding length as the plurality of support columns (420);
The above main drain pipe (200) further includes a pair of fluid flow rate increasing guides (240) arranged on both sides of the vertically protruding plate-shaped reinforcing member (220).
The above fluid flow rate increase guide (240) is
A first guide part (241) that is extended in a straight line to a certain length and faces the plate-shaped reinforcing part (220) at a certain interval; and
A second guide portion (242) is positioned eccentrically from the end of the first guide portion (241) and extends in a straight line by a predetermined length through a bending area (243) that is bent to the left or right from the end of the first guide portion (241), and faces the plate-shaped reinforcement portion (220) by a distance greater than the distance between the plate-shaped reinforcement portion (220) and the first guide portion (241).
The above fluid flow increase guide (240) is characterized in that a plurality of them are arranged along the length direction of the main drain pipe (200).
Permanent drainage system. In paragraph 4,
The fluid flow rate increase guide (240) is characterized in that the flow rate increases between the first guide part (241) and the plate-shaped reinforcement part (220), which are arranged at a narrower interval than between the second guide part (242) and the plate-shaped reinforcement part (220).
Permanent drainage system.