Hydraulic Horizontal Mounting Floodgate for Underground Road using Double Guide Rails

Abstract

The present invention relates to a watertight gate for preventing flooding in underground roads, and more specifically, to a watertight gate installed to prevent damage to vehicles and human lives by rapidly closing the entrance of an underground roadway or tunnel in the event of heavy rain or flooding. By utilizing a hydraulic cylinder embedded or installed in the side wall of the tunnel and a guide rail having a different trajectory, the gate can be vertically lifted and rotated horizontally to be stored in close contact with the ceiling surface, thereby enabling installation without a separate large upper civil engineering structure and stably securing the passage height of the underground roadway.

Description

Technology Field

[0001] The present invention relates to a watertight gate for preventing flooding in underground roads, and more specifically, to a watertight gate installed to prevent damage to vehicles and human lives by rapidly closing the entrance of an underground roadway or tunnel in the event of heavy rain or flooding. By utilizing a hydraulic cylinder embedded or installed in the side wall of the tunnel and a guide rail having a different trajectory, the gate can be vertically lifted and rotated horizontally to be stored in close contact with the ceiling surface, thereby enabling installation without a separate large upper civil engineering structure and stably securing the passage height of the underground roadway. Background Technology

[0002] The content described in this section merely provides background information regarding the present invention and does not constitute prior art.

[0003] With the recent surge in the frequency of localized torrential rains and typhoons caused by climate change, flooding damage in low-lying urban areas and underground spaces is emerging as a serious social problem.

[0004] In particular, due to their structural characteristics, the entrances to underpasses and tunnels are formed lower than the surrounding ground, making them highly vulnerable to flooding caused by concentrated inflow of rainwater during heavy rainfall or the overflowing of nearby rivers.

[0005] Flooding in such underpasses can lead not only to the isolation of vehicles but also to casualties, making the installation of water-blocking facilities essential to quickly and reliably cut off inflow.

[0006] Water cutoff gates installed in underpasses must be designed to remain open under normal circumstances to avoid obstructing vehicle traffic, and to block the flow path only in emergencies.

[0007] Conventional water barrier technologies include tilting gates that rotate and stand upright on the road surface, sliding gates that slide from the left and right, and lift gates that descend from the top to block access.

[0008] Among these, in places with wide entrances such as underpasses (e.g., 10m or more), there is a trend to apply lift-type (hoist-type) watertight gates using wire ropes to ensure structural stability and watertightness.

[0009] However, conventional lift-type watertight gates have the problem that a large hoist must be installed at the top of the tunnel to vertically lift the gate, and a separate machine room or a tall tower-shaped civil engineering structure must be constructed to accommodate it.

[0010] These superstructures not only damage the urban landscape but also make installation impossible or cause massive civil engineering costs in sites with shallow soil cover or spatial constraints.

[0011] In addition, the method of simply raising the door frame vertically has the disadvantage of requiring an excessive facility height to secure the building limits of the underpass, as additional space above the door frame must be secured by the height of the door frame.

[0012] In addition, existing motor and reduction gear drive systems consist of numerous mechanical parts, which had limitations such as being prone to corrosion or breakdown in the humid environment of underground tunnels and making maintenance difficult.

[0013] Therefore, there is an urgent need to develop a new type of watertight gate that can be installed without a separate large superstructure, thereby reducing civil engineering costs; efficiently secure the clearance height of underpasses by converting the gate door horizontally for storage; and simultaneously achieve structural simplification and operational reliability by applying a hydraulic drive system. The problem to be solved

[0014] The problem to be solved by the present invention is to compensate for the disadvantages of the aforementioned prior art, and the objective of the present invention is as follows.

[0015] First, this aims to solve the structural problem that conventional lift-type watertight gates require the construction of a large hoisting drum and a separate machine room to support it above the tunnel in order to lift the gate, which incurs massive civil engineering costs and makes installation impossible at sites where the ground cover above the underpass is shallow.

[0016] Second, this aims to resolve the problems associated with the existing method of simply raising the gates vertically, which requires excessively high upper structures to meet the architectural limits of the underpass or poses a constant risk of collision with large passing vehicles due to the lower part of the gate protruding below the tunnel ceiling.

[0017] Third, this aims to resolve the issues of difficult maintenance and reduced durability caused by the complex hoisting device, composed of a motor, a reduction gear, and multiple gears, being prone to corrosion or mechanical seizing in the humid and smoke-heavy environment of an underground tunnel.

[0018] Fourth, we aim to solve the problem of urban aesthetics caused by large steel structures protruding high above the tunnel entrance and to provide a slim watertight gate that minimizes external protrusion by utilizing the idle space on the tunnel sidewall.

[0019] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0020] According to the present invention, a hydraulic horizontally mounted water barrier of a guide rail type is provided, comprising a main frame installed on both side walls of an underpass, a first rail installed vertically on the main frame, a second rail installed spaced apart from the first rail with its upper end bent backward, first and second rollers respectively coupled to the lower and upper parts of the gate and moving along the first and second rails, and a hydraulic drive unit.

[0021] At this time, the hydraulic drive unit includes a hydraulic cylinder and a wire rope installed on the side wall of the tunnel, and is characterized by a method in which the wire rope is connected to a first roller located at the bottom of the door to pull the door from below. Accordingly, as the first roller rises vertically and the second roller moves along the curved trajectory of the second rail, the door rotates from a vertically closed state to a horizontally open state and is stored in the ceiling surface.

[0022] In addition, the first rail is formed in a straight shape ('—' shape) and the second rail in an angled shape ('L' shape) to control the position of the gate without separate power, and the hydraulic cylinder is configured to be embedded in the side wall, thus not requiring a separate machine room or civil engineering structure above the underpass.

[0023] Furthermore, the above-mentioned door frame or door may be equipped with a sealing rubber that increases adhesion force by water pressure, and may further include a dogging device that supports the load when the door is stored horizontally and an automatic closing control logic based on water level detection.

[0024] Additional means of solution of the present invention will be partially described in the following description, which may be partially easily identified from the description, or may be obtained through the practice of the present invention.

[0025] The foregoing general description and the following detailed description are merely illustrative and illustrative and do not limit the invention as described in the claims. Effects of the invention

[0026] The effects of the present invention configured as described above are explained as follows.

[0027] First, according to the present invention, by applying a sidewall embedded or slim type drive method using a hydraulic cylinder, there is no need to construct a separate large civil engineering structure or machine room on top of the tunnel, so civil engineering costs can be drastically reduced and the construction period can be shortened.

[0028] Second, through a dual guide rail system with different trajectories, the door frame automatically rotates horizontally and is stored in close contact with the ceiling surface when raised, so the maximum architectural clearance of the underpass can be secured without a separate power device, and vehicle collision accidents can be prevented in advance.

[0029] Third, by applying a hydraulic drive system with a simple structure and strong durability instead of a hoisting system that uses complex gear mechanisms or reduction gears, stable operational reliability can be ensured even in humid underground tunnel environments, and maintenance is easy.

[0030] Fourth, while having a simple binding structure in which the wire rope is connected only to the lower roller of the door, it is possible to simultaneously control the lifting and rotational movement of the door, thereby minimizing failure factors through the mechanical simplification of the system.

[0031] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0032] FIG. 1 is a perspective view of a horizontally mounted water barrier according to one embodiment of the present invention. FIGS. 2 and FIGS. 3 are drawings illustrating the closing or opening of a horizontally mounted water barrier according to an embodiment of the present invention. FIG. 4 is a front view and a side view of a door frame according to one embodiment of the present invention. FIGS. 5 and 6 are detailed views of a first roller according to an embodiment of the present invention. FIGS. 7 to 9 are detailed views of a second roller according to an embodiment of the present invention. FIG. 10 is a detailed view of a driving unit according to one embodiment of the present invention. Specific details for implementing the invention

[0033] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the attached drawings.

[0034] The aforementioned objects, features, and advantages of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings. However, as the present invention is subject to various modifications and may include various embodiments, specific embodiments are illustrated in the drawings and described in detail below.

[0035] If it is determined that a detailed description of known functions or configurations related to the present invention could unnecessarily obscure the essence of the invention, such detailed description is omitted. Furthermore, numbers used in the description of this specification are merely identification symbols to distinguish one component from another.

[0036] Furthermore, the suffix "bu" for components used in the following description is used merely to facilitate the drafting of the specification or for interchangeable purposes, and does not inherently possess a distinct meaning or role.

[0037] A watertight gate installed at the entrance of an underpass or tunnel to block inflow water, comprising a main frame installed on both side walls of the underpass, a first rail installed on the main frame and extending vertically from the ground, a second rail installed on the main frame at a predetermined distance from the first rail and having a different trajectory from the first rail, a first roller rotatably coupled to both lower sides of the gate and inserted into the first rail to slide, and a second roller rotatably coupled to both upper sides of the gate and inserted into the second rail to slide, and a gate formed as a panel-shaped member to open and close the flow path of the underpass, and a driving unit for raising and lowering the gate.

[0038] When the underpass is closed, the above door is positioned vertically on the ground, and when the underpass is opened, the above door can be raised a predetermined distance from the ground and positioned parallel to the ground to be stored.

[0039] The above drive unit may include a hydraulic unit that generates hydraulic pressure, a hydraulic cylinder that extends or retracts and is installed vertically on the side wall or inside the main frame, and a wire rope, one end of which is connected to the hydraulic cylinder and the other end of which is connected to the door to transmit traction force, and the other end of which is connected to the lower part of the door at the location where the first roller of the door is installed.

[0040] The drive unit according to the present invention is characterized by being positioned in a side machine room separately provided on the outer side of the side wall, rather than in the upper space of the underpass. This allows for installation even at sites with shallow soil cover above the underpass by housing the hydraulic cylinder and hydraulic unit, which are core devices for driving the gate, in the side of the tunnel, and provides the advantage of enabling a worker to safely enter the side machine room and perform maintenance without controlling the road or using an aerial work platform.

[0041] The above drive unit is largely composed of a hydraulic cylinder that generates power, first and second sheaves that change and transmit the direction of the force, and a wire rope that transmits the power to the door.

[0042] First, the hydraulic cylinder is securely fixed vertically to the floor of the side machine room. By positioning the cylinder vertically, the narrow machine room area can be utilized efficiently.

[0043] A first sheave is positioned at the top of the above hydraulic cylinder. The first sheave receives a wire rope connected to the rod of the hydraulic cylinder and performs the function of converting the vertical tensile force generated by the hydraulic cylinder into a horizontal direction, which is the direction of the underpass entrance.

[0044] The converted driving force is transmitted to the second sheave. The second sheave is installed on the upper frame at the point where the door is located and guides the wire rope, which crosses horizontally from the first sheave, back to the traction point at the bottom of the door. In other words, through a power transmission path leading from the hydraulic cylinder -> first sheave (direction change) -> second sheave (power transmission) -> door, smooth raising and lowering is possible without installing a heavy hydraulic device directly above the door.

[0045] Meanwhile, when operating a water cutoff gate for a long period, the rope may stretch slightly due to its own weight or the application of repetitive loads. If the rope stretches, the sealing force of the gate may decrease or the horizontal balance may be distorted. To prevent this, the present invention is equipped with an adjustment device.

[0046] The above adjustment device may be configured in the form of a turnbuckle or a threaded adjustment device installed at the end of the wire rope or at the sheave connection. When the rope stretches, the manager can restore the rope tension to an appropriate level with a simple operation of tightening or loosening the nut of the adjustment device, without having to replace the entire rope.

[0047] This not only drastically reduces maintenance costs but also enables fine height adjustment so that the door frame adheres precisely to the floor surface, thereby maintaining optimal water-blocking performance.

[0048] When the above hydraulic cylinder is operated, the first roller is pulled vertically upward, and as the first roller is pulled by the wire rope and moves along the first rail, the second roller is guided along the second rail and moves, thereby allowing the displacement of the door to be varied.

[0049] More specifically, the gate is formed as a panel-shaped steel structure capable of blocking the flow path of an underpass, and may have reinforcing materials embedded to withstand water pressure and impact loads.

[0050] A first roller is rotatably coupled to both lower sides of the above door frame and inserted into the first rail, and a second roller is rotatably coupled to both upper sides of the above door frame and inserted into the second rail. At this time, it is preferable that the first roller and the second roller are arranged with different depths or offset forward and backward so that the first roller is selectively coupled only to the first rail and the second roller is selectively coupled only to the second rail, allowing them to move without interference.

[0051] Furthermore, the first rail is formed as a straight '—' shaped rail to guide only the vertical movement of the first roller, and the second rail is formed as an L-shaped rail in which the lower vertical section and the upper horizontal section are connected through a curved section to guide the movement path of the second roller, and as the first roller rises, the door can rotate from a vertically upright closed state to a horizontally lying open state and be stored close to the ceiling surface of the underpass.

[0052] At this time, the hydraulic cylinder is installed by being embedded in at least one of the inner space of the main frame or the side wall of the underpass, with the cylinder rod positioned so as to face downward, and the wire rope is connected to the first roller of the gate via a pulley installed at the end of the cylinder rod, thereby enabling operation without a separate hoisting machine installation space or a protruding machine room above the tunnel.

[0053] More specifically, this structure implements a bottom traction method in which a wire rope lifts the bottom of the door frame, thereby maximizing the moment arm effect compared to a method connected to an upper roller and facilitating the rotational movement of the door frame.

[0054] The operating mechanism of the floodgate through the above configuration is as follows. Normally, to open the underpass, the hydraulic cylinder operates (contracts or extends) to pull the wire rope, causing the first roller of the gate connected to the wire rope to rise vertically along the first rail. Simultaneously, the second roller located at the top of the gate rises along the second rail and enters the curved section.

[0055] The first roller is continuously subjected to a force attempting to rise vertically, but the second roller is guided backward (toward toward the tunnel ceiling) along the curved and horizontal sections, so the door naturally rotates due to kinematic constraints. Finally, when the door reaches the top, it is completely converted from a closed state perpendicular to the ground to a horizontal state parallel to the ground and is stored in close contact with the ceiling surface of the underpass.

[0056] This has the effect of actively controlling the posture of the door using only the difference in rail trajectory and lower traction force without a separate rotary motor.

[0057] Meanwhile, watertight rubber may be provided on the rim of the above door or on the inner surface of the above main frame.

[0058] Furthermore, the above-mentioned index rubber may be composed of a P-shaped or square-shaped elastic member in which the adhesion force is increased by water pressure when the gate beam descends and reaches the closed position.

[0059] The lower part of the above door may further include a lower seal that maintains airtightness with the floor surface.

[0060] The upper part of the main frame may be provided with a support member to support the load of the door and prevent sagging when the door is stored in a horizontal state.

[0061] In addition, the support member may include a hook structure that protrudes by a hydraulic or mechanical method to hook and support the bottom or side of the door frame.

[0062] Meanwhile, it further includes a water level sensor for detecting the flood level of the underpass and a control unit for controlling the operation of the gate, and the control unit may include logic that, when a signal exceeding a set danger level is detected from the water level sensor, it sounds an alarm and simultaneously releases or reverses the pressure of the hydraulic cylinder to rapidly lower and close the gate by its own weight or hydraulic force.

[0063] In order to support a heavy load and ensure durability in a humid environment, the first roller according to one embodiment of the present invention may be configured in the form of an assembly in which a shaft and a bush are combined, rather than a simple wheel structure.

[0064] The first roller is configured to include a shaft fixed to the lower end of the door frame, a roller rotatably coupled to the shaft, a bushing interposed between the shaft and the roller, and fastening members that prevent the detachment of the same.

[0065] First, the shaft serves as an axial member supporting the load of the door frame; one end is inserted into and supported by the door frame, while the other end protrudes through the roller. At this time, if the shaft itself rotates together with the roller, wear may occur due to friction with the door frame. To prevent this, a flatly machined keyway is formed on one end of the shaft, and a key plate is coupled to this keyway. The key plate is firmly fixed to the door frame via a bolt, thereby performing a rotation-prevention function that restrains the shaft from rotating.

[0066] A cylindrical bush is fitted to the outer surface of the shaft. The bush acts as a lubrication-free bearing that facilitates the smooth rotation of the roller without the need for a separate bearing, and it is desirable that it be made of a material that does not corrode or seize even under frequent flooding and moisture exposure, which are characteristic of underground tunnels. In particular, the bush is machined simultaneously with the roller to ensure a precise fit with the inner surface of the roller, thereby minimizing eccentricity or vibration.

[0067] The outer surface of the bush may actually come into rolling contact with the first rail, and the outer surface of the first roller, which comes into rolling contact with the first rail and the inner surface, may have a certain radius of curvature. The roller is made of a rigid material capable of withstanding a high load, and axial movement in one direction is restricted by a flange formed on one side of the bush.

[0068] Furthermore, the other end of the shaft is provided with an anti-detachment structure to prevent the roller and bush from detaching from the shaft. Specifically, a ring-shaped collar is fitted onto the outer surface of the other end of the shaft to support the side of the roller, and a cover plate is fastened to the other end surface of the shaft via bolts. The outer diameter of the cover plate is formed to be larger than the inner diameter of the collar, thereby pressing against the collar and physically blocking the roller and bush from coming out in the axial direction.

[0069] This assembly structure offers superior durability compared to complex ball bearing structures even in environments with frequent submersion, and is very advantageous in terms of maintenance as rollers or bushes can be easily replaced by simply removing the cover plate.

[0070] According to one embodiment of the present invention, the second roller is positioned at the upper end of the door frame and must stably support the rotational moment and load generated during the process of the door frame transitioning from a vertical state to a horizontal state. To this end, the second roller is not directly coupled to the door frame, but is fixed to the door frame through a two-stage coupling structure consisting of an intermediate bracket and a second bracket so as to improve structural stability.

[0071] Referring to the drawing, the second roller unit comprises an intermediate bracket fixed to the upper corner of the door frame, a second bracket coupled to the intermediate bracket and supporting a shaft, and a second shaft and a second roller supported by the second bracket.

[0072] Specifically, the intermediate bracket is a medium connecting the large structure, the door frame, and the roller unit. The intermediate bracket is positioned to wrap around the upper corner area of ​​the door frame and is bolted in a state of simultaneous surface contact with two intersecting surfaces, such as the top and back (or side) surfaces of the door frame. This two-sided contact structure effectively disperses the shear force and tensile force generated during the movement of the door frame.

[0073] A second bracket is attached to one side (vertical surface) of the aforementioned intermediate bracket. The second bracket serves as a housing that firmly holds the second shaft and, by being bolted to the intermediate bracket, provides the convenience of easily separating the entire roller unit from the door during maintenance.

[0074] The second shaft is installed by penetrating the vertical support plate of the second bracket, and the longitudinal center of the shaft is firmly fixed by the second bracket. Both ends of the second shaft protrude outside the second bracket, and the second roller is coupled to this protruding portion. Accordingly, the second roller has a structure in which it is symmetrically arranged on both sides with the second bracket as the center.

[0075] A second bush is press-fitted between the second roller and the second shaft to reduce friction and aid rotation. The second bush is machined simultaneously with the second roller to achieve high concentricity and is designed as a lubrication-free type, ensuring smooth operation without the need for separate lubrication even in humid environments.

[0076] In addition, a ring-shaped second collar is fitted onto the second shaft between the second roller and the second bracket to maintain the gap between the roller and the bracket and prevent friction. A second cover plate is bolted to the end surface of the second shaft on the outermost part of the second roller, physically blocking the roller and bush from disengaging in the axial direction.

[0077] In addition, a keyway is machined at the end of the second shaft, into which a second key plate is inserted. The second key plate is combined with the second cover plate and performs a rotation prevention function to prevent the fastening part from loosening due to vibration or the shaft from spinning freely inside the second bracket.

[0078] As such, the double-joining structure using an intermediate bracket and a second bracket facilitates positional adjustment for alignment with the second rail during on-site installation, and maximizes maintenance efficiency by allowing only the corresponding module to be replaced in the event of damage to a specific part.

[0079] This embodiment is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations of this embodiment within the scope of the essential characteristics of the present invention.

[0080] This embodiment is intended to explain, not limit, the technical concept of the present invention, and therefore, the scope of the rights of the present invention is not limited by this embodiment.

[0081] The scope of protection of the present invention shall be interpreted by the claims, and all technical ideas recognized as equivalent or equivalent thereto shall be interpreted as being included in the scope of rights of the present invention. Explanation of the symbols

[0082] 10 - Underpass 50 - Mainframe 60 - Drive unit 61 - 1st Shiv 62 - 2nd Shiv 65 - Hydraulic cylinder 100 - Gate 101 - 1st Roller 1011 - 1st Roll 1012 - 1st Bush 1013 - 1st shaft 1014 - 1st Color 1015 - 1st cover plate 1016 - 1st Keyplate 102 - 2nd roller 1021 - 2nd Roll 1022 - 2nd Bush 1023 - 2nd shaft 1024 - 2nd Color 1025 - Second cover plate 1026 - 2nd Keyplate 1027 - 2nd bracket 103 - Middle bracket 110 - 1st rail 120 - 2nd rail

Claims

Claim 1 A watertight gate installed at the entrance of an underpass or tunnel to block inflow water, comprising: a main frame installed on both side walls of the underpass; a first rail installed on the main frame and extending vertically from the ground; a second rail installed on the main frame at a predetermined distance from the first rail and having a different trajectory from the first rail; a gate formed as a panel-shaped member to open and close the flow path of the underpass, comprising a first roller rotatably coupled to both lower sides of the gate and inserted into the first rail to slide, and a second roller rotatably coupled to both upper sides of the gate and inserted into the second rail to slide, and comprising a first roller that slides, and a second roller that slides, and is formed as a panel-shaped member; and a driving unit for raising and lowering the gate. It includes, when the underpass is closed, the gate is positioned vertically to the ground, and when the underpass is opened, the gate is raised a predetermined distance from the ground and is positioned parallel to the ground and stored; the first rail is formed as a straight '—' shaped rail to guide only the vertical movement of the first roller, and the second rail is formed as an L-shaped rail in which the lower vertical section and the upper horizontal section are connected through a curved section to guide the movement path of the second roller; as the first roller rises, the gate rotates from a vertically upright closed state to a horizontally lying open state and is stored close to the ceiling surface of the underpass, and the first roller comprises: a first shaft coupled to the lower end of the gate, having a keyway for bolt fastening formed at one end and a fastening hole for snap-fitting formed at the other end; and a cylindrical first bush fitted onto the outer circumference of the first shaft and having a flange formed on one side. A first key plate rotatably coupled to the outer circumference of the first bushing and rolling in contact with the inner surface of the first rail, wherein the outer surface of the first roller rolling in contact with the first rail and the inner surface has a certain radius of curvature, and which is coupled to one end of the first shaft to prevent the first shaft from rotating relative to the door frame;A hydraulic horizontally mounted watertight gate for an underpass or tunnel using a double guide rail, characterized by comprising: a first collar fitted to the outer circumference of the other side of the first shaft to restrict axial movement of the first roller and the first bush; and a first cover plate bolted to the end surface of the other side of the first shaft to prevent detachment of the first collar, the first roller, and the first bush. Claim 2 A hydraulic horizontally mounted watertight gate for an underpass or tunnel using a double guide rail according to claim 1, wherein the driving unit comprises a hydraulic unit that generates hydraulic pressure, a hydraulic cylinder that extends or retracts and is vertically installed on the side wall or inside of the main frame, and a wire rope having one end connected to the hydraulic cylinder and the other end connected to the gate to transmit traction force, and the other end connected to the lower part of the gate at the position where the first roller of the gate is installed, wherein when the hydraulic cylinder is operated, the first roller is pulled vertically upward, and as the first roller is pulled by the wire rope and moves along the first rail, the second roller is guided and moves along the second rail, thereby varying the displacement of the gate. Claim 3 delete Claim 4 delete Claim 5 A hydraulic horizontal watertight gate for an underpass or tunnel using a double guide rail according to claim 1, wherein a watertight rubber is provided on the rim of the gate or on the inner surface of the main frame for watertightness, wherein the watertight rubber is made of a P-shaped or square-shaped elastic member that increases the sealing force by water pressure when the gate descends and reaches a closed position, and further includes a lower seal at the bottom of the gate to maintain airtightness with the floor surface. Claim 6 A hydraulic horizontally mounted watertight gate for an underpass or tunnel using a double guide rail, characterized in that, in claim 1, the upper part of the main frame is provided with a support member to support the load of the door frame and prevent sagging when the door frame is stored in a horizontal state, and the support member includes a hook structure that protrudes by a hydraulic or mechanical method to hook and support the bottom or side of the door frame. Claim 7 A hydraulic horizontally mounted water barrier for an underpass or tunnel using a double guide rail, characterized in that, in paragraph 2, it further includes a water level sensor for detecting the flood level of the underpass and a control unit for controlling the operation of the gate, wherein the control unit includes logic that, when a signal exceeding a set danger level is detected from the water level sensor, it sounds an alarm and simultaneously releases or reverses the pressure of the hydraulic cylinder to rapidly lower and close the gate by its own weight or hydraulic force. Claim 8 delete Claim 9 In claim 1, the second roller is coupled to the upper part of the door frame via an intermediate bracket to which the roller is rotatably axially coupled, wherein the intermediate bracket is positioned to surround the upper corner area of ​​the door frame and is fixed in a state of simultaneous surface contact with two intersecting surfaces including the upper surface and one side (or rear surface) of the door frame, and the second roller is fixed by bolt fastening to the upper corner of the door frame, and comprises: a second bracket including a bottom plate and a vertical support plate; a second shaft coupled by penetrating the vertical support plate of the second bracket, with both ends protruding to the outside of the bracket; a cylindrical second bushing fitted to the outer circumference of each end of the second shaft; a second roller rotatably coupled to the outer circumference of the second bushing and moving along the second rail; and a ring-shaped second collar interposed between the second roller and the second bracket to support the inner surface of the second roller. A hydraulic horizontally mounted watertight gate for an underpass or tunnel using a double guide rail, comprising: a second cover plate fastened to both ends of the second shaft to prevent the second roller and second bush from coming off; wherein the second bracket supports the longitudinal center of the second shaft and the second roller is symmetrically arranged on both sides of the second bracket. Claim 10 In claim 1, the drive unit comprises: a hydraulic cylinder installed in a side machine room separately partitioned on the outer side of the side wall of an underpass or tunnel, which is vertically installed on the floor surface of the side machine room to extend and retract a rod; a first sheave rotatably installed on the upper frame of the side machine room directly above the hydraulic cylinder and converting the vertical driving force transmitted from the hydraulic cylinder into a horizontal direction; a second sheave installed on a frame located directly above the door frame and spaced horizontally from the first sheave, which transmits the driving force transmitted from the first sheave toward the door frame; a wire rope, one end of which is connected to the rod end of the hydraulic cylinder and the other end of which is connected to the lower end of the door frame by sequentially passing through the first sheave and the second sheave; and an adjustment device provided at the connection point of the wire rope or on one side of the frame to which the wire rope is fixed, which adjusts the tension of the wire rope. A hydraulic horizontally mounted watertight gate for an underpass or tunnel using a double guide rail, characterized in that, as the hydraulic cylinder contracts or extends, a driving force is transmitted through the first sheave and the second sheave to raise or lower the gate, and length correction according to the sagging of the wire rope is possible through the adjustment device.

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