Bridge Drainage Apparatus

Abstract

The present invention relates to a bridge drainage device comprising: a collection space formed to receive rainwater flowing down from the road surface of a bridge; a collection port having a plurality of spaced slots formed around the perimeter of the collection space; a drain pipe connected to the collection port to discharge the received rainwater; a plurality of grating bars disposed in the collection space of the collection port, with both ends detachably inserted into the slots, allowing rainwater to pass through while blocking the inflow of foreign substances; and a filter unit disposed inside the drain pipe to filter foreign substances. Therefore, the detachable structure of the grating bar ensures quickness and convenience in cleaning and maintenance, and the filter mesh blocks the discharge of foreign substances, thereby improving the reliability of rainwater drainage.

Description

Technology Field

[0001] The present invention relates to a bridge drainage device. Background Technology

[0002] Bridge drainage systems are installed to quickly and efficiently drain rainwater accumulated on the bridge road surface. These systems play a crucial role in ensuring traffic safety and extending the lifespan of bridge structures.

[0003] When it rains, water accumulates on the bridge surface; if this is not drained, it can lead to vehicle skidding accidents. In the long term, problems such as corrosion of concrete and steel, damage to the pavement layer, and cracking caused by freezing and thawing occur. Therefore, bridges require a systematic drainage system to prevent these risks.

[0004] Referring to FIGS. 7 to 9, the bridge drainage device (100) basically has a structure for quickly collecting rainwater that falls on the bridge road surface and discharging it to the underside of the bridge.

[0005] The bridge drainage device (1) includes a water collection port (10), a drain pipe (20), and a grating (30) installed on the upper part of the water collection port (10).

[0006] The water collection port (10) serves to collect rainwater flowing down from the bridge road surface and to bring it into the interior, and a drainage pipe (20) is connected to the lower part thereof to safely transport the collected water to a discharge point outside the bridge or below.

[0007] A grating (30) is installed on the top of the drain (10) to prevent various foreign substances, such as fallen leaves, gravel, plastic pieces, and trash, from entering the drain.

[0008] The grating (30) is composed of a frame member (31) and a grating bar (32).

[0009] The frame member (31) is formed to correspond to the inner circumference shape of the water collection port (10) and is stably seated on the upper part of the water collection port when installed.

[0010] A plurality of grating bars (32) are arranged at regular intervals inside the frame member (31), so that water passes through between them and flows into the water collection port (10), and foreign matter is filtered from the top. At this time, the spacing of the grating bars (32) is designed to simultaneously consider drainage efficiency and blocking performance, and is usually set to a width that can secure a sufficient flow rate without allowing fallen leaves or sand to pass through.

[0011] However, in actual usage environments, even though the grating (30) is installed, some foreign matter still enters the catch basin (10). In particular, during rainfall, fallen leaves, soil, sand, etc., flow in with the water and accumulate inside the catch basin, or furthermore, block the drain pipe (20). In this case, drainage is not smooth, so water may pool or overflow on the road surface, which threatens traffic safety and shortens the lifespan of the bridge.

[0012] Therefore, when such a situation occurs, the manager must separate the grating (30) from the drain (10) to remove foreign matter from inside. However, there is a problem that it is not easy to separate the grating (30) structurally.

[0013] The grating (30) is designed so that the outer perimeter of the frame member (31) is in surface contact with the inner perimeter of the drain (10), so while the sense of unity is excellent, the detachability is poor. In other words, because the two members are in close contact, a considerable amount of force is required to lift or separate them, and there is a risk of structural damage. Furthermore, as time passes, sand or mud penetrates into the fine gap (G) between the frame member (31) and the drain (10), causing friction between them to increase and resulting in a phenomenon where they become stuck. As a result, the grating (30) is not easily lifted, or in severe cases, the inconvenience of having to use tools such as a hammer or a lever occurs.

[0014] Meanwhile, since the accumulation of foreign substances is not easily identifiable from the outside, the problem is often recognized only after a blockage actually occurs.

[0015] Accordingly, the manager has the inconvenience of having to visit each drain (10) individually and visually inspect whether foreign matter has accumulated inside. In particular, after rainfall, fallen leaves or sand accumulate in multiple drains simultaneously, so the manager must tour the entire bridge section to perform individual inspections. Prior art literature

[0016] Republic of Korea Registered Utility Model No. 20-0498205 (Announced July 30, 2024) Republic of Korea Registered Utility Model No. 20-0322138 (Announced August 6, 2003) The problem to be solved

[0017] The present invention resolves poor drainage and management inefficiency caused by foreign substances inside the catch basin of a bridge water collection device, and provides a technology that allows for easy detachment of the grating bar and simple maintenance. means of solving the problem

[0018] A bridge drainage device according to one embodiment of the present invention comprises a collection space formed to receive rainwater flowing down from the road surface of a bridge, a collection port with a plurality of spaced slots formed around the perimeter of the collection space, a drain pipe connected to the collection port for discharging the received rainwater, a plurality of grating bars disposed in the collection space of the collection port, with both ends inserted so as to be detachably attached to the slots, allowing rainwater to pass through while blocking the inflow of foreign substances, and a filter unit disposed inside the drain pipe for filtering foreign substances.

[0019] The inner perimeter of the water collection opening forming the water collection space has multiple faces, and the slots are formed on each of the two opposing faces among the multiple faces, have a predetermined depth in the vertical direction, and can be arranged in the width direction.

[0020] A pre-water inflow hole may be formed on the inner circumference of the plurality of the above-mentioned water collection holes where the slot is not formed.

[0021] The above filtration unit may include a mounting bracket seated on the inner bottom of the water collection port, a filter mesh inserted into the drain pipe to filter foreign substances, and an elastic member connecting the filter mesh and the mounting bracket.

[0022] The above filter net is suspended from the mounting bracket by the above elastic member, and when foreign matter accumulates, it can descend by the elastic force of the above elastic member.

[0023] The above filter unit may further include a marker connected to the filter mesh, with the top exposed to the outside of the water collection port.

[0024] When the filter net is lowered, the signpost is also lowered so that the upper part can flow into the water collection port.

[0025] The above filter may further include a display portion formed at the top of the above signpost.

[0026] The above display unit may include a coloring unit or a light-emitting unit.

[0027] The above filter mesh may include a filter body having an open top surface and a filter drain hole formed in the inner bottom, and a flange formed along the upper edge of the filter body and connected to the elastic member.

[0028] The outer perimeter of the above flange may be separated from the inner perimeter of the above drain pipe.

[0029] The above elastic member may include a coil spring. Effects of the invention

[0030] According to an embodiment of the present invention, the grating bar is structured to be detachably inserted into a slot of the drainage hole, so the separation and reassembly of the grating bar are easy, allowing the inside of the drainage hole to be cleaned quickly, and foreign substances are secondarily filtered through the filtering part to prevent clogging of the drain pipe, and as a result, the drainage efficiency of the bridge and the convenience of maintenance are improved.

[0031] According to an embodiment of the present invention, a slot is formed in the vertical direction on the opposing surface of the inner circumference of the water collection opening that forms the water collection space, so that the grating bar is stably supported, thereby preventing shaking or detachment of the grating bar while allowing it to be easily attached and detached, thus improving both installation stability and maintenance efficiency.

[0032] According to an embodiment of the present invention, a pre-drainage inflow hole is further provided on a surface where no slot is formed, so rainwater flows in smoothly in multiple directions, and the amount of water flowing into the drainage hole is dispersed, thereby improving drainage efficiency.

[0033] According to an embodiment of the present invention, since the filter mesh is suspended from a stand via an elastic member, the filter mesh naturally descends according to the load when foreign matter accumulates, and returns to its original position by elastic force after cleaning, allowing the filtration status to be intuitively assessed and providing the effect of easy maintenance.

[0034] According to an embodiment of the present invention, since the marker connected to the filter net protrudes outside the water collection port, when the filter net descends, the change in the position of the marker is visually recognized from the outside, so there is an effect of easily checking whether foreign matter has accumulated without looking inside the water collection port.

[0035] According to an embodiment of the present invention, a display part is formed at the top of the signpost, so that the exposure state of the display part changes according to the position change of the filter mesh, thereby clearly distinguishing whether it is clogged and improving the speed and accuracy of inspection.

[0036] According to an embodiment of the present invention, since the display unit includes a colored unit or a light-emitting unit, the condition of the drain can be easily recognized even in situations with low visibility, such as at night or inclement weather, thereby increasing inspection efficiency and safety.

[0037] According to an embodiment of the present invention, the filter mesh is structured to include a filter body and a flange, allowing rainwater to pass through smoothly and residual water to be removed through a bottom with a drainage hole formed therein, and the outer surface of the flange is spaced apart from the inner surface of the drain pipe, thereby facilitating the smooth flow of drainage.

[0038] According to an embodiment of the present invention, by using a coil spring as an elastic member, the filter mesh descends smoothly according to the load of foreign matter, and after cleaning, it automatically returns to its original position by means of a restoring force, thereby facilitating repeated use and easy maintenance. Brief explanation of the drawing

[0039] FIG. 1 is a schematic diagram showing a bridge drainage device according to one embodiment of the present invention. Fig. 2 is an exploded view of Fig. 1. Fig. 3 is an enlarged view of the drainage outlet of Fig. 2. Fig. 4 is an enlarged view of the filter section of Fig. 2. Figure 5 is a different cross-sectional view of Figure 1 along the VV line. FIG. 6 is a schematic diagram showing the filter section of FIG. 5 in a lowered state. FIG. 7 is a schematic diagram showing a conventional bridge drainage device. Fig. 8 is an exploded view of Fig. 7. Fig. 9 is a plan view of Fig. 7. Specific details for implementing the invention

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Throughout the specification, similar parts are denoted by the same reference numerals.

[0041] The motor and power transmission device according to the embodiment of the present invention can be applied to a transfer device which is an embodiment of the present invention; therefore, the following description will focus on the transfer device to which the motor and power transmission device are applied.

[0042] Then, a bridge drainage device according to one embodiment of the present invention will be described with reference to FIGS. 1 to 6.

[0043] Referring to FIGS. 1 to 6, the bridge drainage device (100) according to the present embodiment includes a water collection port (110), a drain pipe (120), a grating bar (130), and a filtration unit (140), and rapidly discharges rainwater accumulated on the bridge road surface, while simultaneously improving the drainage problems and maintenance inefficiencies caused by foreign substances such as fallen leaves, sand, and gravel entering the water collection port (110).

[0044] A water collection space (111) having a certain volume is formed inside a water collection hole (110) that can be buried in a bridge. Rainwater flowing down from the road surface of the bridge is temporarily stored in the water collection space (111).

[0045] The interior of the collection port (110) forming the water collection space (111) has a polyhedral structure composed of multiple faces. The lower portion of the interior perimeter of the water collection space (111) is formed as an inclined surface to facilitate the smooth inflow and outflow of rainwater. However, it may be formed as a curved surface. This structure guides the inflowing rainwater to flow naturally down to the bottom of the water collection space without remaining on the interior wall. In particular, the interior wall of the collection port may be processed to be smooth or treated with a waterproof or anti-fouling coating so that foreign substances do not adhere to or accumulate. Therefore, even in a repeated rainfall environment, the accumulation of internal contamination is minimized, allowing for stable drainage performance to be maintained for a long period.

[0046] Meanwhile, the water collection space (111) is formed with a completely open top so that rainwater can fall directly into it. Even if foreign matter is temporarily introduced into the water collection space, the open top allows the manager to easily perform cleaning or inspection.

[0047] A water collection drainage hole (112) is formed in the inner bottom of the water collection port (110). The water collection drainage hole (112) serves as a passage to allow rainwater flowing into the water collection space (111) to be drained immediately. The size and shape of the water collection drainage hole (112) are designed considering the drainage volume, drop, and bridge slope conditions. This can also be configured to ensure that the discharge flow of rainwater is smoothly dispersed.

[0048] In summary, the water collection port (110) of the present embodiment has features such as efficient guidance of rainwater through a polyhedral structure, maximization of water collection efficiency through an upper opening, rapid discharge through a water collection drainage hole (112), and prevention of foreign matter accumulation through internal coating and the formation of an inclined surface. As a result, it provides a water collection port with functional and structural completeness that quickly processes rainwater accumulated on the bridge road surface and enhances the convenience of maintenance.

[0049] Meanwhile, on the upper side of the inner circumference of the drainage outlet (110), on two facing surfaces (111a, 111b), multiple slots (114) are formed that extend in the vertical direction and have a constant depth. Each slot (114) is formed with a predetermined depth and width. The slots (114) are formed at equal intervals along the inner circumference of the drainage outlet (110). However, the spacing between adjacent slots (114) may also be formed in a form where the spacing gradually widens. This can be a design modification considering conditions such as the longitudinal slope of the bridge, the direction of rainwater inflow, and the flow rate distribution. A configuration that gradually changes the spacing of the slots (114) provides functional advantages by optimizing the drainage flow of the bridge while preventing water overflow or flow velocity concentration in specific sections.

[0050] Additionally, the spacing of the slots (114) can be varied according to the overall size of the catch basin (110), the installation location, and the design standards of the bridge to which it is applied. For example, in wide road surfaces or high-flow sections, the spacing of the slots (114) can be narrowed to maximize water collection efficiency. Conversely, in sections where maintenance is frequent or the inflow is low, the spacing can be widened to simplify the structure and improve constructability.

[0051] In the other two sides (111c, 111d) of the inner circumference of the water collection port (110) where slots (114) are not formed, pre-water inflow holes (113) are formed to further improve the drainage efficiency of the bridge. The two sides (111c, 111d) where the pre-water inflow holes (113) are formed are connected to a pre-water channel (200) installed longitudinally along the bridge road surface. Rainwater flowing in through the pre-water channel (200) can flow directly into the water collection space (111) through the pre-water inflow holes (113) and be collected.

[0052] The pre-water inflow hole (113) can be implemented in various forms depending on its shape and size. For example, in sections where the amount of rainwater inflow is relatively low, it can be formed in the shape of a circular hole, which makes construction simple and allows for easy control of inflow, and in sections with high flow rates or near slopes, it can be formed in a linear shape that extends along the surface of the catch basin (110). This linear shape has the advantage of being able to inflow a large amount of rainwater at once, thereby preventing water from accumulating on the bridge road surface even during heavy rain and allowing for flexible response to fluctuations in flow rate.

[0053] The drain pipe (120) is connected to the lower part of the water collection port (110) and serves as a passage for discharging rainwater that has flowed into the water collection space (111) to the outside of the bridge. That is, rainwater flowing in from the bridge road surface is temporarily collected in the water collection space (111) of the water collection port (110), then passes through the water collection drainage hole (112) and flows into the drain pipe (120), and is naturally discharged along this path to a discharge point on the outside or under side of the bridge.

[0054] The grating bar (130) is placed in the water collection space (111) to allow rainwater to pass through while blocking foreign substances such as fallen leaves, trash, and gravel from entering directly into the interior. The grating bar (130) is formed with a predetermined length to have a certain rigidity and length, and both ends are inserted into the slot (114) and supported. Since the grating bar (130) is stably fixed solely by the structure of the slot (114) without a frame member or separate fasteners, it has the structural advantage of being easy to install and easy to detach during maintenance.

[0055] The surface of the grating bar (130) is finished smoothly or treated with an anti-fouling coating to minimize the attachment of foreign substances or the occurrence of rust. This maintains the aesthetics of the bridge road surface while also preventing the deterioration of the grating bar (130)'s functionality even after long-term use.

[0056] The spacing between the grating bars (130) is designed to simultaneously consider the permeability of rainwater and the efficiency of blocking foreign substances. That is, the spacing is maintained at a width sufficient to prevent large particles of foreign substances, such as fallen leaves or plastic fragments, from passing through, while allowing rainwater to pass through quickly. Accordingly, rainwater on the bridge road surface flows into the collection space (111) without delay, maximizing drainage efficiency and preventing water from accumulating on the bridge.

[0057] However, in actual usage environments, some foreign substances such as fine dust, sand, and twigs may pass through the grating bars (130) along with rainwater and enter the water collection space (111). In such cases, after a certain period of time, sediment may accumulate inside the water collection space (111) and obstruct the drainage flow. To solve this, the grating bars (130) are designed to be easily detachable from the slots (114). When necessary, the manager can pull out the grating bars (130) from the slots (114) to directly clean the inside of the water collection space (111) or easily reinsert them back into their original positions after removing accumulated foreign substances. This structure can fundamentally solve problems such as the inability to detach due to sand accumulation or the need to dismantle the entire grating, which occurred in conventional frame-integrated grating structures. In other words, since detachment is possible on an individual grating bar (130) basis, the cleaning range is free, and the speed of maintenance is dramatically improved.

[0058] Additionally, the structural arrangement of the grating bar (130) may be formed parallel to the width direction of the catch basin (110), or, if necessary, may be arranged in a form that coincides with or is orthogonal to the direction of rainwater inflow. This allows for a customized drainage design tailored to the slope conditions of the bridge or the direction of drainage flow. In particular, in some embodiments, the upper surface of the grating bar (130) is formed with a fine curved surface or an uneven structure to induce rainwater to flow quickly into the center, thereby enabling control of the inflow speed and flow rate.

[0059] In short, the grating bar (130) is easy to attach and detach and clean through a slot-insertion structure, ensures long-term durability by using a material that combines corrosion resistance and strength, achieves drainage efficiency and foreign matter blocking effects simultaneously through optimized spacing design, and maximizes maintenance efficiency through individual separation. Therefore, the structure of the grating bar (130) does not merely serve to allow rainwater to pass through, but also improves the management efficiency of the bridge drainage device (100) and prevents blockage problems caused by foreign matter.

[0060] The filtration unit (140) is positioned inside the drain pipe (120) to effectively filter foreign substances such as fallen leaves, sand, and gravel from rainwater flowing in through the water collection space (111), thereby preventing blockage inside the drain pipe (120) and maintaining smooth drainage. The filtration unit (140) includes a support (141), a filter mesh (142), and an elastic member (143), and may further include a signpost (145) as needed.

[0061] The mounting bracket (141) is stably seated on the inner bottom of the water collection port (110). A mounting drain hole (141a) is formed in the center of the mounting bracket (141). The mounting drain hole (141a) is connected to the drain pipe (120) through the water collection drain hole (112). Accordingly, rainwater from the water collection space (111) can flow into the drain pipe (120) through the mounting drain hole (141a) and the water collection drain hole (112).

[0062] The filter screen (142) includes a filter body (142a) and a flange (142c) and is inserted into the interior of the drain pipe (120) to filter out foreign substances that enter with rainwater.

[0063] The filter body (142a) has an interior that is open to the top, and rainwater flowing in through the mounting drain hole (141a) and the water collection drain hole (112) can flow into the interior.

[0064] The inner circumference diameter of the filter body (142a) is larger than the circumference diameter of the mounting drain hole (141a). Accordingly, rainwater flowing into the drain pipe (120) through the filter drain hole (142b) and the water collection drain hole (112) can flow into the interior of the filter body (142a) without any leakage.

[0065] A filtration drain hole (142b) is formed at the bottom of the filter body (142a) to drain rainwater that has flowed into the filter body (142a). The filtration drain hole (142b) may also be formed around the perimeter of the filter body (142a). The opening size of the filtration drain hole (142b) is optimized according to the water collection environment. For example, a relatively large opening may be used to filter out large particles such as fallen leaves or plastic fragments, and a denser mesh structure may be applied in areas with a lot of sand or fine particles.

[0066] Accordingly, solid materials such as fallen leaves, sand, and gravel that flow into the filter body (142a) along with rainwater flowing down from the bridge road surface remain inside the filter body (142a) and gradually accumulate. Through this structure, the direct inflow of solid materials into the drain pipe (120) is effectively blocked, thereby fundamentally preventing problems such as blockage, reduced flow velocity, or accumulation of sediment that may occur inside the drain pipe (120).

[0067] That is, the filter body (142a) acts as a primary filter in the rainwater inflow path and blocks most foreign substances before they enter the drain pipe (120). As a result, fallen leaves or fine particles naturally accumulate on the upper part of the filter body (142a), and the manager can easily remove the foreign substances accumulated inside by simply lifting the filter body (142a) during regular inspection or cleaning.

[0068] Meanwhile, rainwater flowing into the interior of the filter body (142a) flows over the top of the filter body (142a) and into the drain pipe (120) in the form of an overflow. In other words, even in situations such as heavy rain or short-duration rainfall, a path is secured for the rainwater to drain naturally by gravity without temporarily accumulating on the top of the filter body (142a). This overflow structure serves as a safety device that prevents drainage delays or backflow by ensuring that rainwater is discharged smoothly despite temporary blockage of the filter body (142a).

[0069] Therefore, the filter body (142a) has the effect of maximizing the reliability and efficiency of the bridge drainage system by going beyond a simple filter function and simultaneously blocking foreign substances and performing emergency drainage functions.

[0070] The flange (142c) is formed along the upper outer circumference of the filter body (142a). The edge of the flange (142c) is separated from the inner circumference of the drain pipe (120). Overflowing rainwater can be drained into the drain pipe (120) through the space between the flange (142c) and the inner circumference of the drain pipe (120).

[0071] The flange (142c) is formed along the upper outer circumference of the filter body (142a). The flange (142c) supports the filter body (142a) to be stably positioned inside the drain pipe (120) while allowing overflowed rainwater to be drained smoothly.

[0072] The edge of the flange (142c) is spaced apart from the inner circumference of the drain pipe (120) at a certain distance. This gap prevents the filter body (142a) from adhering to the inner wall of the drain pipe (120), thereby forming an auxiliary overflow passage through which rainwater can flow. Through this structure, even when the inside of the filter body (142a) is temporarily filled with a large amount of rainwater or partially blocked, if the water level inside the filter body (142a) rises, the remaining rainwater can naturally overflow into the drain pipe (120) along the space between the flange (142c) and the inner wall of the drain pipe (120).

[0073] The flange (142c) is integrally formed around the upper circumference of the filter body (142a) to maintain stable structural support during assembly and disassembly processes.

[0074] The elastic member (143) includes a coil spring having a preset elastic modulus. The upper end of the elastic member (143) is connected to the lower surface of the support (141), and the lower end is connected to the upper surface of the flange (142c). A connecting ring (144) to which the elastic member (143) is connected is formed on the lower surface of the support (141) and the upper surface of the flange (142c). The upper and lower ends of the elastic member (143) are bent into a ring shape and hooked onto the connecting ring (144). The elastic member (143) connects the filter mesh (142) and the support (141).

[0075] It serves to allow the filter mesh (142) to move up and down elastically according to changes in the weight of foreign matter accumulated inside. That is, when foreign matter contained in rainwater accumulates on the filter mesh (142), the filter mesh (142) gradually descends due to the load, and after cleaning, it returns to its original position by the restoring force of the elastic member. In other words, when foreign matter accumulates inside the filter mesh (142), the position of the filter mesh (142) changes due to the elastic force of the elastic member (143).

[0076] Through this structure, the filter unit (140) has a self-adjusting structure that physically reflects the degree of foreign matter accumulation and allows for automatic return. As a result, the filter unit (140) goes beyond the role of a simple filter and functions as an active configuration that responds to changes in the clogging state in real time.

[0077] The lower end of the signpost (145) is connected to the inner bottom of the filter body (142a), and the upper end protrudes outward from the water collection port (110) through the gap between the grating bars (130). The signpost (145) serves as an indicator that allows visual confirmation of changes in the position of the filter mesh (142) from the outside, and when foreign matter accumulates and the filter mesh (142) descends, the signpost also descends together. Accordingly, the manager can immediately determine the filtration status and whether there is a blockage inside the water collection port (110) by only looking at the height of the signpost (145) or the position of the indicator (145a) without opening the water collection port (110) or looking inside.

[0078] Meanwhile, a display part (145a) is formed at the top of the signpost (145) to enhance external identification. The display part (145a) includes a colored part or a light-emitting part.

[0079] The colored part is made of high-contrast colors such as fluorescent yellow, fluorescent orange, and red, which have high visibility during both day and night, allowing the manager to quickly check changes in the location of the signpost even from a distance.

[0080] The light-emitting part is formed of a phosphorescent (luminescent) material that absorbs and accumulates ambient light and emits afterglow in the dark, thereby ensuring the visibility of the display part even in low-light environments such as at night, inclement weather, and tunnel sections.

[0081] The display unit (145a) is positioned so that the exposure length or exposure area changes according to the rise and fall of the signpost, thereby intuitively conveying the change in position of the filter mesh (142). For example, if foreign matter accumulates on the filter mesh (142) and it falls, the colored / luminous part at the top of the signpost (145) disappears below the upper surface of the grating bar (130), or the relative position with respect to the step indicator line changes, allowing the degree of blockage to be determined immediately.

[0082] The outer surface of the display unit (145a) can be protected from discoloration and contamination through water-repellent, anti-fouling coatings or anti-UV stabilization treatments, and, if necessary, scales and warning lines can be added to allow the "inspection needed" critical position to be recognized at a glance. With this configuration, the manager can quickly and accurately check whether a blockage has occurred and the extent of it without opening the drain (110) or directly observing the inside.

[0083] The filtration unit (140) according to the present embodiment achieves stable support and effective blocking of foreign substances through a combined structure of a support (141) and a filter net (142). Due to the elastic action of the elastic member (143), the filter net (142) has the function of automatically moving and returning in accordance with changes in load. In that the filtration status can be grasped at a glance without directly checking the inside of the collection port (110) through the visual display function of the signpost (145), it has the effect of dramatically improving inspection efficiency and convenience of maintenance compared to existing bridge drainage devices.

[0084] Consequently, the filtration unit of this embodiment has a remarkable technical feature that goes beyond simply acting as a filter to remove foreign substances, functioning as an intelligent drainage management structure capable of stabilizing drainage flow, preventing clogging, and automating inspection.

[0085] The following explains the operation of the bridge drainage system described above.

[0086] When rain begins, rainwater on the road surface of the bridge falls into the collection space (111) of the collection port (110), and large fallen leaves or debris are initially blocked by the grating bar (130) placed above the collection space (111). At this time, some solid materials such as fallen leaves, sand, and gravel may pass between adjacent grating bars (130) and flow into the collection space (111).

[0087] At the same time, the flow rate of the pre-flood channel b) flowing in the longitudinal direction of the bridge flows into the water collection space (111) in the transverse direction through the pre-flood inflow hole (113) of the side wall of the water collection port (110), thereby forming a composite water collection state in which upward and transverse inflows occur in parallel.

[0088] Rainwater collected in the collection space (111) falls into the drain pipe (120) through the mounting drain hole (141a) and the collection drain hole (112). A filtration unit (140) is positioned inside the drain pipe (120), so rainwater flows into the interior of the filtration mesh (142). The rainwater passes through the filtration drain hole (142b) of the filtration body (142a) and is discharged into the flow path of the drain pipe (120).

[0089] On the other hand, solid materials such as fallen leaves, sand, and gravel remain and accumulate inside the filter body (142a), effectively blocking direct inflow into the drain pipe (120). At this time, the filter mesh (142) is combined with an elastic member (143) so that as the load of solid materials increases, it gradually descends and changes position.

[0090] In the event that a large volume of water flows in for a short period of time, such as during heavy rain, or the filter screen (142) is partially blocked, the water level inside the filter body (142a) rises, and the remaining rainwater overflows into the drain pipe (120) through the space between the flange (142c) and the inner circumference of the drain pipe (120).

[0091] Changes in the position of the filter mesh (142) are transmitted to the outside through the marker (145), and the indicator (145a) of the marker (145) is composed of a colored part or a light-emitting part, so the degree of blockage can be immediately identified by the exposed length or change in position alone. The manager checks the position of the indicator (145a) without opening the water collection port (110) or looking inside, quickly selects the priority maintenance target, and if necessary, immediately restores normal operation by pulling out the grating bar (130) from the slot (114) at the corresponding location to remove sediment in the water collection space (111) or by lifting the filter part (140) to discharge and wash internal solids and then reinserting it. Since the filter mesh (142) and the marker (145) automatically return to their original positions by means of the elastic member (143), active operation is achieved in which the filtration state self-follows changes in load.

[0092] Accordingly, according to an embodiment of the present invention, the grating bar (130) is inserted into the slot (114) and has a detachable structure, thereby ensuring speed and convenience for cleaning and maintenance, and the state of foreign matter accumulation can be intuitively checked from the outside through the filter mesh (142) and the signpost (145) structure, and the efficiency of inspection and drainage reliability can be improved by using the display part (145a) and the elastic member (143).

[0093] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention. Explanation of the symbols

[0094] 100: Bridge drainage system 110: Catch basin 111: Catchment space 112: Catchment drain hole 113: Pre-emptive Water Inflow Hole 114: Slot 120: Drain pipe 130: Grating bar 140: Filter section 141: Stand 141a: Mounting drain hole 142: Filter mesh 142a: Filter body 142b: Filter drain hole 142c: Flange 143: Elastic member 144: Connecting ring 145: Marker 145a: Display unit

Claims

Claim 1 A bridge drainage device comprising: a collection space formed to receive rainwater flowing down from the road surface of a bridge; slots formed in the vertical direction around the perimeter of the collection space, wherein the slots are spaced apart and include a plurality of collection holes formed along the inner perimeter of the collection space; a drain pipe connected to the collection holes to discharge the incoming rainwater; a plurality of grating bars, each having its ends detachably inserted into each slot and arranged along the width direction of the collection space, allowing rainwater to pass through while blocking the inflow of foreign matter; a filtering section disposed inside the drain pipes to filter foreign matter and capable of descending when the foreign matter accumulates; and a marker connected to the filtering section, the upper end of which is exposed to the outside of the collection holes, wherein the plurality of grating bars are detachable individually, and the marker descends along the filtering section when the filtering section descends, with the upper end flowing into the collection holes. Claim 2 A bridge drainage device according to claim 1, wherein the inner perimeter of the water collection opening forming the water collection space has a plurality of faces, and the slots are formed on each of the two opposing faces among the plurality of faces, having a predetermined depth in the vertical direction and arranged in the width direction. Claim 3 A bridge drainage device according to paragraph 2, wherein a pre-water inflow hole is formed on the side of the inner circumference of the plurality of water collection holes where the slot is not formed. Claim 4 A bridge drainage device according to claim 1, wherein the filtering unit comprises a mounting bracket seated on the inner bottom of the drainage hole, a filter net inserted into the drain pipe to filter foreign substances, and an elastic member connecting the filter net and the mounting bracket, wherein the filter net is suspended from the mounting bracket by the elastic member and descends by the elastic force of the elastic member when foreign substances accumulate. Claim 5 delete Claim 6 A bridge drainage device according to claim 1, wherein the filter portion further comprises a marking portion formed on the top of the signpost. Claim 7 In paragraph 6, the above-mentioned display part is a bridge drainage device including a coloring part or a light-emitting part. Claim 8 A bridge drainage device according to claim 4, wherein the filter mesh comprises a filter body having an open top surface and a filter drain hole formed in the inner bottom, and a flange formed along the upper edge of the filter body and connected to the elastic member, wherein the outer perimeter of the flange is separated from the inner perimeter of the drain pipe. Claim 9 In paragraph 4, the elastic member is a bridge drainage device including a coil spring.

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