Fall prevention device for steel tower

Abstract

The present invention relates to a fall prevention device for a steel tower that can provide safer support for a worker during ascent and descent. The device comprises a bottom fixing unit installed at the bottom of a vertical frame of the steel tower, a plurality of vertical fixing units spaced apart and fastened along the vertical frame, a vertical rail installed in connection with the bottom fixing unit and the plurality of vertical fixing units, and a moving unit on which a rope is installed and which slides along the longitudinal direction of the vertical rail. With this configuration, the vertical rail is firmly installed on the vertical frame of the steel tower, and the worker's rope is installed on the moving unit that moves along the vertical rail, thereby achieving the effect of safe and convenient use.

Description

Technology Field

[0001] The present invention relates to a fall prevention device for a steel tower equipped with an anti-slip unit, and more specifically, to a fall prevention device for a steel tower that can support a worker more safely when ascending or descending the steel tower. Background Technology

[0003] Generally, steel poles or towers are supports that support high-voltage power lines or communication cables, and workers climb them to perform work such as installing various power lines or communication cables or repairing power distribution equipment or power lines damaged by strong winds or other external factors.

[0004] Since there is a risk of falling when a worker climbs a steel tower to perform tasks, a safety rope is installed vertically on the tower, and after the worker puts on a safety harness, the rope connected to the safety harness is secured to the safety rope using a fall protection device.

[0005] The fall guard fixed to the safety rope can move up and down along the safety rope, making power line work easier, and in the event of a worker's fall, the fall guard stops by pinching the safety rope due to the principle of leverage, preventing the worker from falling vertically.

[0006] However, since the worker climbing first installs the safety rope vertically on the tower and the subsequent worker uses this rope, the worker climbing first is performing the ascent and descent without any safety devices whatsoever.

[0007] In addition, costs are continuously incurred due to the installation of one-time fall prevention safety ropes for every ascent, and the use of work assistance ropes during equipment inspections is complex and inconvenient, which increases the risk of slipping and falls. Consequently, there is a problem in that the work efficiency of workers ascenting steel towers is reduced.

[0008] Korean Registered Patent No. 10-2449140 discloses a "fall prevention wire fixing device for steel towers," and Korean Registered Patent No. 10-2355719 discloses a "safety device for preventing falls from steel towers." These prior patents specify that by mechanically utilizing a wire, a wire fixing device, a clamp part, a guide part, a steel tower vertical member, an upper supporter of the vertical member, a fixing bracket for the steel tower vertical member, and a lower fixing bracket for the vertical member, the wire installed vertically on the steel tower is fixed to prevent movement, and the fall prevention function is effectively performed through the robust support of the wire to ensure the safety of the tower climber.

[0009] However, with this configuration, the wire passing only through the upper and lower clamp ends is shaken by mechanical and electrical vibrations occurring in the overhead transmission line in the outdoor environment, and if this shaking continues for a long time, fatigue accumulates, and if the vibration phenomenon intensifies in the transmission tower, wear of the wire occurs, and there is a constant possibility of failure due to external contact caused by wire breakage and disconnection, which poses a very high operational risk problem.

[0010] In addition, in order to operate a stable fall prevention device and allow workers to safely move vertically or horizontally, there must be a fixing means that can firmly secure each wire and simultaneously easily detach it; however, current fall prevention devices lack a means to secure the wire, so they shake randomly even with mechanical vibrations, and there is a problem in that the probability of a worker falling is ever-present due to interference with the platform bolts and horizontal members and wire wear caused by lateral movement.

[0011] In addition, in 345kV and 765kV ultra-high voltage transmission lines, when one of the two parallel transmission lines is shut down due to the influence of parallel lines and other phases, capacitance is generated by the potential difference between the normal supply line and the shut-down line. The value of the generated energy that is not directly connected to ground is called stray voltage. When one of the two lines is shut down, the energized line induces a significant amount of stray voltage in the parallel shut-down line, which exacerbates the difficulties in the shutdown work environment and the work of workers.

[0012] In particular, when a large energy floating voltage is induced in the vertical and horizontal lifelines at the upper, middle, and lower arms where power lines are laid, it flows through the human body, which has high resistance, and as a result, an induced current of about 20 mA is generated, increasing the risk of muscle contraction and significant pain, making it difficult to perform work at height. Prior art literature

[0014] Korean Registered Patent No. 10-2449140 (2022.09.26) Korean Registered Patent No. 10-2355719 (2022.01.21) The problem to be solved

[0015] The present invention was devised to solve the aforementioned problems, and its purpose is to provide a fall prevention device for steel towers that can be used safely and conveniently by securely installing a vertical rail on the vertical frame of the steel tower and installing a worker's rope on a moving unit that moves along the vertical rail.

[0016] Furthermore, the present invention aims to provide a fall prevention device for a steel tower that can be used safely and conveniently by securely installing a horizontal rail on the horizontal frame of the steel tower and installing a worker's rope on a moving unit that moves along the horizontal rail.

[0017] In addition, the present invention aims to provide a fall prevention device for steel towers that can be used safely and conveniently by providing a direction changing unit between a vertical rail and a horizontal rail, thereby allowing easy movement between the vertical rail and the horizontal rail without separating the moving unit from the rail.

[0018] Furthermore, the present invention aims to provide a fall prevention device for a steel tower that can safely protect a worker from floating voltage by having a grounding unit that electrically connects the vertical rail and the ground. means of solving the problem

[0020] To achieve the above objective, a fall prevention device for a steel tower according to a preferred embodiment of the present invention comprises: a bottom fixing unit installed at the bottom of a vertical frame of a steel tower; a plurality of vertical fixing units spaced apart and fastened along the vertical frame; a vertical rail installed in connection with the bottom fixing unit and the plurality of vertical fixing units; and a moving unit having a rope installed and sliding along the longitudinal direction of the vertical rail.

[0021] Here, the lowest fixing unit may comprise: a first lowest fixing part formed by bending to wrap around one side of the vertical frame and having the vertical rail fastened to one end; and a second lowest fixing part formed by bending to wrap around the other side of the vertical frame and having both ends fastened to the first lowest fixing part and installed on the vertical frame.

[0022] In addition, the first lowest fixing part may comprise: a lowest vertical rail fastening part formed by bending at one end in a direction facing the vertical frame and to which the vertical rail is fastened; and a first fastening plate formed by bending at the other end in an outward direction of the vertical frame and positioned to face the second fastening plate of the second lowest fixing part.

[0023] In addition, the second lowest fixing member may comprise: at least one locking member formed by bending in a vertical direction at one end and inserted into a fastening hole formed on one side of the first lowest fixing member to be supported by locking; and a second fastening plate formed by bending in an outward direction of the vertical frame at the other end and positioned to face the first fastening plate of the first lowest fixing member.

[0024] The lowermost fixing unit may further include an anti-slip unit that is installed by penetrating at least one of the first lowermost fixing part and the second lowermost fixing part, and is supported by frictional force on the vertical frame to prevent slipping.

[0025] More specifically, the anti-slip unit may comprise: a body portion connected to either the first lowest fixed portion or the second lowest fixed portion; a contact portion formed protruding from the body portion and adhering to the vertical frame; a friction ball received in a receiving groove formed in the contact portion and optionally protruding to the outer surface of the contact portion to adher to the vertical frame; and a contact elastic member that applies elastic force to cause the friction ball to protrude to the outer surface of the contact portion.

[0026] Here, the receiving groove may be formed to allow the friction ball to slide, and may be formed at an angle such that it does not protrude to the outer surface of the contact portion when the contact elastic member moves in a direction of compression, and protrudes to the outer surface of the contact portion when the contact elastic member elastically returns.

[0027] In addition, a pair of receiving grooves are formed in the contact portion so as to have slopes in opposite directions, and the friction ball and the contact elastic member are disposed in each of the pair of receiving grooves to provide frictional force in the vertical direction.

[0028] Additionally, the anti-slip unit may further comprise a sealing member that is fastened along the circumference of the body part and seals by being in close contact with either the first lowest fixing part or the second lowest fixing part.

[0029] The above vertical fixing unit may comprise: a base frame fastened to one side of the vertical frame; a support frame formed to protrude in a vertical direction from the base frame and in close contact with the other side of the vertical frame; and a vertical rail fastening part fastened to the end of the base frame and to which the vertical rail is fastened.

[0030] Here, the vertical fixing unit may comprise a stepping member, one end of which fastens the base frame to one surface of the vertical frame, and the other end of which provides an area to support the worker's foot.

[0031] And, the above-mentioned moving unit may comprise: a moving part that is inserted into the vertical rail and slides; and a fastening ring provided on the moving part and to which a carabiner is fastened.

[0032] Here, it may be formed to include a closing block that is fastened to at least one of the two ends of the vertical rail to close the end of the vertical rail so as not to detach the moving unit.

[0033] Alternatively, it may comprise an opening / closing part that is fastened to at least one of the two ends of the vertical rail and closes the end of the vertical rail so that the moving unit does not detach, or opens the end of the vertical rail so that the moving unit is inserted into the vertical rail.

[0034] More specifically, the opening / closing member may comprise: an opening / closing bracket fastened to the vertical rail; an opening / closing lever rotatably fastened to a hinge portion formed on the opening / closing bracket; and an opening / closing elastic member, one side of which is supported by the opening / closing lever and the other side of which is supported by the hinge portion to apply elastic force to the opening / closing lever.

[0035] Here, the opening / closing lever may be configured to protrude in a direction perpendicular to the longitudinal direction of the vertical rail and supported by a support projection of the opening / closing bracket, rotate upward when an external force is applied, and return to its original position by the opening / closing elastic member when the external force is removed.

[0036] At this time, the moving unit may comprise a stopper pin that is provided to protrude toward the opening / closing lever, moves the opening / closing lever upward when inserted into the end of the vertical rail, and is supported by the opening / closing lever when the opening / closing lever returns.

[0038] To achieve the above objectives, a fall prevention device for a steel tower according to a preferred embodiment of the present invention may comprise: a bottom fixing unit installed at the bottom of a vertical frame of the steel tower; a plurality of vertical fixing units spaced apart and fastened along the vertical frame; a vertical rail installed in connection with the bottom fixing unit and the plurality of vertical fixing units; a moving unit having a rope installed and sliding along the longitudinal direction of the vertical rail; a plurality of horizontal fixing units spaced apart and fastened along a horizontal frame of the steel tower; and a horizontal rail installed in connection with the plurality of horizontal fixing units and provided to allow the moving unit to slide along the horizontal frame.

[0039] Here, the horizontal fixing unit may comprise a fastening frame that is fastened to the horizontal frame; a support block installed on the fastening frame; and a horizontal rail fastening part installed on the support block and on which the horizontal rail is installed.

[0040] In addition, the fastening frame may comprise: an outer frame positioned to surround the outer surface of the horizontal frame; an inner frame in close contact with the inner surface of the horizontal frame; and a fastening member that fastens the outer frame and the inner frame to the horizontal frame.

[0041] The above support block can be rotatably fastened to a support block fastening projection formed protruding outwardly from the fastening frame.

[0042] In addition, the horizontal rail fastening portion may comprise a support block fastening frame that is fastened to the support block; and a horizontal rail fastening frame that is bent and formed at the end of the support block fastening frame and to which the horizontal rail is fastened.

[0043] In addition, the horizontal rail fastening part may be provided in multiple numbers, and at least one of the support block fastening frame and the horizontal rail fastening frame may be formed with different lengths.

[0044] Here, the support block fastening frame may be configured such that a support block fastening hole is formed in the part that is fastened to the support block, thereby allowing the gap between the horizontal rail and the horizontal frame to be adjusted.

[0045] In addition, the horizontal rail fastening frame may have a horizontal rail fastening hole formed in the part that is fastened to the horizontal rail, so that the fastening height of the horizontal rail can be adjusted.

[0046] In addition, it may be formed to include a closing block that is fastened to at least one of the two ends of the horizontal rail to close the end of the horizontal rail so as not to detach the moving unit.

[0047] Alternatively, it may comprise an opening / closing part that is fastened to at least one of the two ends of the horizontal rail and closes the end of the horizontal rail so that the moving unit does not detach, or opens the end of the horizontal rail so that the moving unit is inserted into the horizontal rail.

[0049] To achieve the above objectives, a fall prevention device for a steel tower according to a preferred embodiment of the present invention may comprise: a bottom fixing unit installed at the bottom of a vertical frame of the steel tower; a plurality of vertical fixing units spaced apart and fastened along the vertical frame; a vertical rail installed in connection with the bottom fixing unit and the plurality of vertical fixing units; a moving unit on which a rope is installed and which slides along the longitudinal direction of the vertical rail; a plurality of horizontal fixing units spaced apart and fastened along a horizontal frame of the steel tower; a horizontal rail installed in connection with the plurality of horizontal fixing units and provided to allow the moving unit to slide along the horizontal frame; and a direction changing unit on which the vertical rail and the horizontal rail are installed and which changes the direction so that the moving unit can move to either the vertical rail or the horizontal rail.

[0050] Here, the direction changing unit may comprise: a housing to which the ends of the vertical rail and the horizontal rail are respectively connected; a rotating plate in which a projection is inserted into a through hole of the housing and arranged to rotate; a rotating plate connecting part disposed on the outer surface of the housing and connected to the projection; and a rotating rail connected to the rotating plate and rotating together, and connected to either the vertical rail or the horizontal rail, through which the moving unit moves.

[0051] In addition, the direction changing part may further include a position limiting part provided in the housing and in close contact with the rotating plate, which restricts the rotation of the rotating plate at a position where the rotating rail is connected to the vertical rail or the horizontal rail.

[0052] More specifically, the position limiting member may comprise: a position limiting member housing that is fastened to the housing; a fixing ball that is received in the position limiting member housing and inserted into either a horizontal rail positioning groove or a vertical rail positioning groove formed at a 90-degree angle along the circumferential direction on the rotating plate; and a fixing ball elastic member disposed between the position limiting member housing and the fixing ball and applying an elastic force to cause the fixing ball to be in close contact with the rotating plate.

[0053] In addition, the rotating plate may further include a fixed ball guide slit formed to a depth smaller than that of the horizontal rail positioning groove and the vertical rail positioning groove, and connecting the horizontal rail positioning groove and the vertical rail positioning groove to guide the movement of the fixed ball.

[0054] With this configuration, when the rotating plate is rotated by a force exceeding a certain amount, the fixed ball inserted into the vertical rail positioning groove is disengaged and moves relative to the fixed ball guide slit, and when positioned in the horizontal rail positioning groove, it is inserted into the horizontal rail positioning groove by the elastic force of the fixed ball elastic member and fixed in position.

[0055] In addition, the direction changing part may further include a rotation limiting pin that is fastened to the housing and inserted into a rotation limiting slit formed on the rotating plate, and limits the rotation of the rotating plate such that when supported at one end of the rotation limiting slit, the rotating rail is connected to the vertical rail, and when supported at the other end of the rotation limiting slit, the rotating rail is connected to the horizontal rail.

[0056] In addition, the direction changing unit may further include a rotating plate sealing member provided between the housing and the rotating plate to block foreign matter from entering the housing.

[0057] Furthermore, the direction changer may comprise a bushing disposed between the inner surface of the rotating plate and the housing to support rotation; and a washer disposed between the rotating plate fastening part and the outer surface of the housing to support rotation.

[0059] To achieve the above objectives, a fall prevention device for a steel tower according to a preferred embodiment of the present invention may further comprise: a bottom fixing unit installed at the bottom of the vertical frame of the steel tower; a plurality of vertical fixing units spaced apart and fastened along the vertical frame; a vertical rail installed in conjunction with the bottom fixing unit and the plurality of vertical fixing units; a moving unit having a rope installed and sliding along the longitudinal direction of the vertical rail; and a grounding unit connecting the vertical rail to the ground to ground it.

[0060] More specifically, the grounding unit may comprise: a grounding cable connected to the vertical rail through a grounding terminal to be electrically connected; and a grounding plate provided as a conductor, buried in the ground, and electrically connected to the grounding cable connected thereto.

[0061] And, the grounding unit may further comprise a plurality of grounding rods that are electrically connected to the grounding plate and buried in a direction perpendicular to the ground. Effects of the invention

[0063] According to the fall prevention device for a steel tower according to the present invention, a vertical rail is securely installed on the vertical frame of the steel tower, and a worker's rope is installed on a moving unit that moves along the vertical rail, thereby achieving the effect of safe and convenient use.

[0064] In addition, according to the present invention, a horizontal rail is securely installed on the horizontal frame of a steel tower, and a worker's rope is installed on a moving unit that moves along the horizontal rail, thereby achieving the effect of safe and convenient use.

[0065] In addition, according to the present invention, by providing a direction changing unit between a vertical rail and a horizontal rail, the moving unit can be easily moved between the vertical rail and the horizontal rail without separating it from the rail, thereby achieving the effect of safe and convenient use.

[0066] Furthermore, according to the present invention, by providing a grounding unit that electrically connects the vertical rail and the ground, the effect of safely protecting the worker from floating voltage can be obtained. Brief explanation of the drawing

[0068] FIG. 1 is a perspective view schematically illustrating a state in which a fall prevention device for a steel tower according to an embodiment of the present invention is installed on a steel tower. FIG. 2 is a perspective view schematically illustrating the state in which the lowest fixing unit is installed on a steel tower in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 3 is a schematic perspective view showing the lowest fixing unit extracted from a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 4 is a schematic perspective view showing an anti-slip unit extracted from a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 5 is a side view schematically illustrating the state in which an anti-slip unit operates in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 6 is a schematic diagram illustrating a state in which a closing block is installed at the end of a vertical rail in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 7 is a schematic diagram illustrating the state in which an opening and closing part is installed at the end of a vertical rail in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 8 is a perspective view schematically illustrating the state in which a vertical fixing unit is installed on a steel tower in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 9 is a schematic perspective view showing a vertical fixing unit extracted from a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 10 is a perspective view schematically illustrating the state in which a vertical fixing unit and a horizontal fixing unit are installed on a steel tower in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 11 is a schematic perspective view illustrating a state in which a horizontal fixing unit is installed on a steel tower in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 12 is a schematic perspective view showing the state in which a horizontal fixing unit is installed on a steel tower in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 13 is a schematic perspective view showing a horizontal fixing unit extracted from a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 14 is a side view schematically illustrating a horizontal fixing unit extracted from a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 15 is a schematic perspective view showing a direction changing part extracted from a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 16 is a schematic perspective view showing a direction changing part extracted from a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 17 is an exploded perspective view schematically illustrating a direction changing part in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 18 is a schematic perspective view showing a rotating plate extracted from a direction changing part of a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 19 is a schematic diagram illustrating the state in which a direction changing part operates in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 20 is a schematic diagram illustrating a state in which a direction changing part is installed at the top of a vertical rail in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 21 is a perspective view schematically illustrating the state in which a grounding unit is installed in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 22 is a plan view schematically illustrating the state in which a grounding unit is installed in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 23 is a perspective view schematically illustrating the state in which the grounding cable of the grounding unit is connected to a vertical rail in a fall prevention device for a steel tower according to an embodiment of the present invention. FIG. 24 is a schematic diagram illustrating the state of being grounded by a grounding unit in a fall prevention device for a steel tower according to an embodiment of the present invention. Specific details for implementing the invention

[0069] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0070] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0071] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0072] Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries may be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and may not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0074] Specific embodiments of the present invention will be described below with reference to the attached drawings.

[0075] FIG. 1 is a perspective view schematically illustrating the state in which a fall prevention device for a steel tower according to an embodiment of the present invention is installed on a steel tower, FIG. 2 is a perspective view schematically illustrating the state in which the lowest fixing unit of the fall prevention device for a steel tower is installed on a steel tower, FIG. 3 is a perspective view schematically illustrating the lowest fixing unit extracted therefrom. FIG. 4 is a perspective view schematically illustrating the state in which an anti-slip unit extracted therefrom is installed on the fall prevention device for a steel tower, FIG. 5 is a side view schematically illustrating the state in which the anti-slip unit is in operation. FIG. 6 and FIG. 7 are drawings schematically illustrating the state in which a closing block and an opening / closing part are respectively installed at the end of a vertical rail in the fall prevention device for a steel tower. Also, FIG. 8 is a perspective view schematically illustrating the state in which a vertical fixing unit is installed on a steel tower in the fall prevention device for the steel tower, and FIG. 9 is a perspective view schematically illustrating the vertical fixing unit extracted from the above.

[0076] Referring to FIGS. 1 to 9, a fall prevention device (100) for a steel tower according to an embodiment of the present invention comprises a bottom fixing unit (200) installed at the bottom of a vertical frame (11) of a steel tower (10), a plurality of vertical fixing units (300) spaced apart and fastened along the vertical frame (11), a vertical rail (110) installed in connection with the bottom fixing unit (200) and the plurality of vertical fixing units (300), and a moving unit (130) having a rope installed and sliding along the length direction of the vertical rail (110).

[0077] That is, the fall prevention device (100) for a steel tower according to the present invention is configured such that the lowest fixing unit (200) and the vertical fixing unit (300) are firmly fastened to the vertical frame (11), the vertical rail (110) is installed on the lowest fixing unit (200) and the vertical fixing unit (300), and the moving unit (130) is inserted into the vertical rail (110) to slide up and down along the vertical rail (110).

[0078] With this configuration, a worker's rope (lifeline) is installed on the moving unit (130), so that when the worker ascends or descends the steel tower (10), the moving unit (130) moves together along the vertical rail (110) in an up-and-down direction, allowing the worker to ascend or descend more conveniently and safely.

[0079] The lowermost fixing unit (200) is installed at the bottom of the vertical frame (11) to more firmly secure the bottom of the vertical rail (110).

[0080] More specifically, the lowermost fixing unit (200) may comprise a first lowermost fixing part (210) that is formed by bending to wrap around one side of the vertical frame (11) and has the vertical rail (110) attached to one end, and a second lowermost fixing part (220) that is formed by bending to wrap around the other side of the vertical frame (11) and has both ends attached to the first lowermost fixing part (210) and installed on the vertical frame (11). That is, with the first lowermost fixing part (210) positioned to wrap around one side of the vertical frame (11), the second lowermost fixing part (220) can be attached to the first lowermost fixing part (210) while wrapping around the other side of the vertical frame (11) to secure it to the vertical frame (11).

[0081] Here, the first lowest fixing part (210) may comprise a lower vertical rail fastening part (211) formed by bending at one end in a direction facing the vertical frame (11) and to which the vertical rail (110) is fastened, and a first fastening plate (212) formed by bending at the other end in an outward direction of the vertical frame (11) and positioned to face the second fastening plate (222) of the second lowest fixing part (220).

[0082] Additionally, the second lowest fixing part (220) may be formed by bending in a vertical direction at one end and inserting into a fastening hole (213) formed on one side of the first lowest fixing part (210) to be supported by being caught, and a second fastening plate (222) formed by bending in an outward direction of the vertical frame (11) at the other end and positioned to face the first fastening plate (212) of the first lowest fixing part (210).

[0083] With this configuration, the locking part (221) of the second lowest fixing part (220) is inserted into the fastening hole (213) formed in the first lowest fixing part (210) to provide locking support, and then the first fastening plate (212) and the second fastening plate (222) are fastened and secured using bolts and nuts, thereby allowing the first lowest fixing part (210) and the second lowest fixing part (220) to be fastened to the vertical frame (11) with greater force.

[0084] Additionally, the lowermost fixed unit (200) may further include an anti-slip unit (230) that is installed by penetrating at least one of the first lowermost fixed part (210) and the second lowermost fixed part (220) and is supported by frictional force on the vertical frame (11) to prevent slipping.

[0085] That is, the first lowest fixing part (210) and the second lowest fixing part (220) may slide along the vertical frame (11) due to a high load while fastened to the vertical frame (11). Accordingly, the present invention further provides the anti-slip unit (230) to more firmly prevent the phenomenon of the lowest fixing unit (200) sliding while installed on the vertical frame (11).

[0086] More specifically, the anti-slip unit (230) may comprise a body portion (231) that is fastened to either the first bottom fixing portion (210) or the second bottom fixing portion (220), a contact portion (232) that is formed protruding from the body portion (231) and is in close contact with the vertical frame (11), a friction ball (234) that is received in a receiving groove (233) formed in the contact portion (232) and optionally protrudes to the outer surface of the contact portion (232) and is in close contact with the vertical frame (11), and a contact elastic member (235) that applies elastic force to cause the friction ball (234) to protrude to the outer surface of the contact portion (232).

[0087] Here, the receiving groove (233), with reference to FIG. 5, is formed so that the friction ball (234) slides, and when the contact elastic member (235) moves in a direction of compression, it does not protrude to the outer surface of the contact portion (232), and when the contact elastic member (235) elastically returns, it is formed at an angle so that it protrudes to the outer surface of the contact portion (232). Accordingly, the friction ball (234) is subjected to a force that causes it to protrude to the outer surface of the contact portion (232) by the elastic force of the contact elastic member (235), and the friction ball (234) protruding to the outer surface of the contact portion (232) is in contact with the vertical frame (11) and can apply frictional force to prevent slipping.

[0088] In addition, as shown in FIG. 4, a pair of receiving grooves (233) may be formed in the contact portion (232) so as to have inclinations in opposite directions, and the friction ball (234) and the contact elastic member (235) may be disposed in each of the pair of receiving grooves (233) to provide frictional force in the up and down direction. Through this configuration, all sliding in the up and down direction can be prevented.

[0089] Additionally, the anti-slip unit (230) may further include a sealing member (236) that is fastened along the circumference of the body part (231) and seals in close contact with either the first lowest fixing part (210) or the second lowest fixing part (220). That is, since the function of the friction ball (234) may be degraded when foreign matter is introduced into the receiving groove (233), the sealing member (236) is provided at the part where the anti-slip unit (230) is fastened to prevent foreign matter from entering the interior.

[0090] The vertical fixing unit (300) is installed along the vertical frame (11) at a predetermined distance from the upper side of the bottom fixing unit (200) installed at the bottom of the vertical frame (11) to fasten and fix the vertical rail (110).

[0091] More specifically, the vertical fixing unit (300) may comprise a base frame (310) that is fastened to one side of the vertical frame (11), a support frame (320) that is formed to protrude in a vertical direction from the base frame (310) and is in close contact with the other side of the vertical frame (11), and a vertical rail fastening part (330) that is fastened to the end of the base frame (310) and to which the vertical rail (110) is fastened.

[0092] With this configuration, when the base frame (310) is pressed against the vertical frame (11), the base frame (310) and the support frame (320) are pressed together against the corner portion of the vertical frame (11), and when the base frame (310) is fastened to the vertical frame (11), the vertical fixing unit (300) is firmly fastened to the vertical frame (11) without shaking.

[0093] Here, the vertical fixing unit (300) may further include a stepping member (340) in which one end fastens the base frame (310) to one side of the vertical frame (11) and the other end provides an area to support the worker's foot. That is, as shown in FIG. 8, the stepping member (340) that fastens the base frame (310) to the vertical frame (11) may be provided with a step bolt. Through this, the vertical fixing unit (300) can be installed on the vertical frame (11) and an area where a worker can step can be provided.

[0094] The above-mentioned moving unit (130) is configured to be inserted into the vertical rail (110) and slide along the vertical rail (110) together with the worker when the worker ascends or descends.

[0095] More specifically, the moving unit (130) may comprise a moving part (131) that is inserted into the vertical rail (110) and slides, and a fastening ring (132) to which a carabiner (133) is attached, which is provided on the moving part (131) and on which a worker's rope is installed.

[0096] Additionally, the above-mentioned moving unit (130) may be configured so that it does not move in the downward direction and its movement is restricted in certain situations. That is, in the event that a worker falls, a large load is applied to the above-mentioned moving unit (130) in the downward direction, and at this time, the above-mentioned moving unit (130) may be fixed to the above-mentioned vertical rail (110) to prevent the worker from falling. Since this structure is a known technology, a detailed description thereof is omitted.

[0097] And, referring to FIG. 6, it may be configured to include a closing block (140) that is fastened to at least one end of the vertical rail (110) to close the end of the vertical rail (110) so that the moving unit (130) does not detach. That is, both ends of the vertical rail (110) are open, and the moving unit (130) can be installed on the vertical rail (110) by inserting it into the open side. Then, the closing block (140) can be fastened to the end of the vertical rail (110) to close the open side of the vertical rail (110) so that the moving unit (130) does not detach from the vertical rail (110).

[0098] Alternatively, referring to FIG. 7, it may be configured to include an opening / closing part (150) that is fastened to at least one end of the vertical rail (110) and closes the end of the vertical rail (110) so that the moving unit (130) does not detach, or opens the end of the vertical rail (110) so that the moving unit (130) can be inserted into the vertical rail (110). That is, when the moving unit (130) is inserted into the vertical rail (110), the opening / closing part (150) is opened so that the moving unit (130) can be inserted into the vertical rail (110), and when the moving unit (130) is inserted into the vertical rail (110), the moving unit (130) is supported by the opening / closing part (150) so that it does not detach from the vertical rail (110).

[0099] More specifically, the opening / closing part (150) may comprise an opening / closing bracket (151) that is fastened to the vertical rail (110), an opening / closing lever (152) that is rotatably fastened to a hinge part (151a) formed on the opening / closing bracket (151), and an opening / closing elastic member (153) that is supported on one side by the opening / closing lever (152) and supported on the other side by the hinge part (151a) to apply elastic force to the opening / closing lever (152).

[0100] Referring to FIG. 7, the above-mentioned opening / closing lever (152) is positioned to protrude in a direction perpendicular to the longitudinal direction of the vertical rail (110) and is supported by the support projection (151b) of the opening / closing bracket (151). It operates to rotate upward when an external force is applied and to return to its original position by the opening / closing elastic member (153) when the external force is removed.

[0101] In this case, the moving unit (130) may be provided to protrude toward the opening / closing lever (152), and may include a stopper pin (134) that moves the opening / closing lever (152) upward when inserted into the end of the vertical rail (110) and is supported by the opening / closing lever (152) when the opening / closing lever (152) returns.

[0102] With this configuration, when the moving unit (130) is inserted into the open end of the vertical rail (110), the stopper pin (134) provided in the moving unit (130) presses the opening / closing lever (152), causing the opening / closing lever (152) to rotate upward and open, thereby inserting the moving unit (130) into the inside of the vertical rail (110). Then, when the stopper pin (134) of the moving unit (130) is disengaged from the opening / closing lever (152), the opening / closing lever (152) returns to its original position and is supported by the support projection (151b) of the opening / closing bracket (151). At this time, even if the moving unit (130) moves downward, the stopper pin (134) of the moving unit (130) is engaged and supported by the opening / closing lever (152), and the opening / closing lever (152) is engaged and supported by the support projection (151b), so the moving unit (130) can be prevented from detaching from the vertical rail (110). In this case, the user can detach the moving unit (130) from the vertical rail (110) after rotating the opening / closing lever (152) upward.

[0104] FIG. 10 is a perspective view schematically illustrating the state in which a vertical fixing unit and a horizontal fixing unit are installed on a steel tower in a fall prevention device for a steel tower according to an embodiment of the present invention, FIG. 11 and FIG. 12 are perspective views schematically illustrating the state in which the horizontal fixing unit is installed on a steel tower, FIG. 13 is a perspective view schematically illustrating the horizontal fixing unit, and FIG. 14 is a side view schematically illustrating the horizontal fixing unit.

[0105] Referring to FIGS. 1 to 14, the fall prevention device (100) for a steel tower according to the present invention may further comprise a plurality of horizontal fixing units (400) spaced apart and fastened along a horizontal frame (12) of a steel tower (10), and a horizontal rail (120) installed in conjunction with the plurality of horizontal fixing units (400) and provided so that a moving unit (130) slides along the horizontal frame (12).

[0106] The horizontal fixing unit (400) is installed at a predetermined interval along the horizontal frame (12) provided in a horizontal direction on the steel tower (10) to fasten and fix the horizontal rail (120). That is, the horizontal fixing unit (400) is configured to fasten and fix the horizontal rail (120) to the horizontal frame (12), and is provided so that when a worker moves left and right on the horizontal frame (12), the moving unit (130) can move left and right along the horizontal rail (120).

[0107] The above-described horizontal fixing unit (400) may comprise a fastening frame (410) that is fastened to the horizontal frame (12), a support block (420) that is installed on the fastening frame (410), and a horizontal rail fastening part (430) that is installed on the support block (420) and on which the horizontal rail (120) is installed.

[0108] More specifically, the fastening frame (410) may be composed of an outer frame (411) positioned to surround the outer surface of the horizontal frame (12), an inner frame (412) in close contact with the inner surface of the horizontal frame (12), and a fastening member (413) that fastens the outer frame (411) and the inner frame (412) to the horizontal frame (12).

[0109] That is, the above-mentioned fastening frame (410) can be firmly fastened to the horizontal frame (12) by positioning the outer frame (411) in close contact with the outside of the horizontal frame (12), pressing the inner frame (412) in close contact with the inside of the horizontal frame (12), and then fastening the outer frame (411) and the inner frame (412) together with the fastening member (413) provided with a bolt and nut.

[0110] Additionally, the support block (420) can be rotatably fastened to a support block fastening projection (414) formed protruding outward from the fastening frame (410). For example, as shown in FIG. 13, the support block fastening projection (414) has an end formed in the shape of a ball joint, and the support block (420) can be fastened to the end of the support block fastening projection (414) which is in the shape of a ball joint to rotate and tilt. Through this, the installation position and installation angle of the horizontal rail (120) fastened to the horizontal rail fastening part (430) can be adjusted more easily.

[0111] Additionally, the horizontal rail fastening part (430) may be composed of a support block fastening frame (431) that is fastened to the support block (420) and a horizontal rail fastening frame (432) that is bent and formed at the end of the support block fastening frame (431) and to which the horizontal rail (120) is fastened.

[0112] The above horizontal rail fastening part (430) may be provided in multiple numbers as shown in FIG. 14, and at least one of the support block fastening frame (431) and the horizontal rail fastening frame (432) may be formed with different lengths.

[0113] Additionally, the support block fastening frame (431) may have a support block fastening hole (431a) formed in the part that is fastened to the support block (420) so that the gap between the horizontal rail (120) and the horizontal frame (12) can be adjusted.

[0114] In addition, the horizontal rail fastening frame (432) may have a horizontal rail fastening hole (432a) formed in the part that is fastened to the horizontal rail (120) so that the fastening height of the horizontal rail (120) can be adjusted.

[0115] Through this configuration, the horizontal rail (120) can be installed at various positions and angles corresponding to the shape of the horizontal frame (12) through the horizontal fixing unit (400) which adjusts the angle, height, and spacing.

[0116] Furthermore, it may further include a closing block (140) that is fastened to at least one end of the horizontal rail (120) to close the end of the horizontal rail (120) so that the moving unit (130) does not detach.

[0117] Additionally, it may further include an opening / closing part (150) that is fastened to at least one of the two ends of the horizontal rail (120) and closes the end of the horizontal rail (120) so that the moving unit (130) does not detach, or opens the end of the horizontal rail (120) so that the moving unit is inserted into the horizontal rail (120).

[0118] Since the above-mentioned closing block (140) and the above-mentioned opening / closing part (150) have the same configuration as the closing block (140) and the opening / closing part (150) attached to the end of the vertical rail (110) with reference to FIGS. 6 and 7, a detailed description thereof is omitted.

[0119] In this way, when a worker installs the moving unit (130) on the vertical rail (110) and moves it left and right on the horizontal frame (12) after lifting, there may be inconvenience and safety issues as the worker must detach the moving unit (130) from the vertical rail (110), reinstall the moving unit (130) on the horizontal rail (120), and then perform the work.

[0120] Accordingly, the present invention further comprises a direction changing unit (500) capable of moving the moving unit (130) to the horizontal rail (120) without separating it from the vertical rail (110). The direction changing unit (500) will be described in more detail below with reference to the drawings.

[0122] FIGS. 15 and 16 are schematic perspective views showing a direction changing unit extracted from the fall prevention device for the steel tower, FIG. 17 is an exploded perspective view showing a direction changing unit, FIG. 18 is a schematic perspective view showing a rotating plate extracted from the direction changing unit, FIG. 19 is a diagram showing a state in which the direction changing unit is in operation. FIG. 20 is a diagram showing a state in which the direction changing unit is installed at the top of a vertical rail.

[0123] Referring to FIGS. 1 to 20, the fall prevention device (100) for a steel tower of the present invention may further include a direction changing unit (500) that changes the direction of the moving unit (130) so that it can move to either the vertical rail (110) or the horizontal rail (120), and the vertical rail (110) and the horizontal rail (120) are installed.

[0124] That is, the end of the vertical rail (110) is connected in the vertical direction of the direction changing unit (500), and the end of the horizontal rail (120) is connected in the horizontal direction, and the moving unit (130) that has been moved through the vertical rail (110) is rotated in the direction changing unit (500) so that it can be moved to the horizontal rail (120).

[0125] More specifically, the direction changing unit (500) may comprise a housing (510) to which the ends of the vertical rail (110) and the horizontal rail (120) are respectively connected, a rotating plate (520) in which a protrusion (521) is inserted into a through hole (511) of the housing (510) and arranged to rotate, a rotating plate connecting part (530) arranged on the outer surface of the housing (510) and connected to the protrusion (521), and a rotating rail (540) connected to the rotating plate (520) to rotate together and connected to either the vertical rail (110) or the horizontal rail (120) so that the moving unit (130) moves.

[0126] With this configuration, as shown in FIG. 16, a pair of vertical rails (110) are connected in both vertical directions of the housing (510), and a pair of horizontal rails (120) are connected in both horizontal directions, so that the rotating rail (540) can operate to connect the pair of vertical rails (110) in both vertical directions by rotating, or to connect the pair of horizontal rails (120) in both horizontal directions by rotating at a 90-degree angle.

[0127] That is, the moving unit (130) can move along the vertical rail (110), then be positioned on the rotating rail (540), and then the rotating rail (540) can be rotated at a 90-degree angle to be connected to the horizontal rail (120), and then the moving unit (130) can be moved along the horizontal rail (120).

[0128] Through this, the moving unit (130) moving along the vertical rail (110) can be moved directly to the horizontal rail (120) without being separated from the vertical rail (110), thereby supporting the worker's movement on the horizontal frame (12), making it safer and more convenient to use.

[0129] Additionally, the direction changing unit (500) may further include a position limiting unit (550) that is provided in the housing (510) and in close contact with the rotating plate (520), and which restricts the rotation of the rotating plate (520) at a position where the rotating rail (540) is connected to the vertical rail (110) or the horizontal rail (120).

[0130] That is, the direction changing unit (500) is configured to support the rotating plate (520) so that it does not rotate unless the rotating plate (520) is rotated by a force greater than a certain amount while the rotating plate (520) is positioned at a location connected to the vertical rail (110) or the horizontal rail (120).

[0131] More specifically, the position limiting member (550) may comprise a position limiting member housing (551) that is fastened to the housing (510), a fixing ball (552) that is received in the position limiting member housing (551) and inserted into either a horizontal rail positioning groove (522) or a vertical rail positioning groove (523) that is spaced apart at a 90-degree angle along the circumferential direction on the rotating plate (520), and a fixing ball elastic member (553) that is disposed between the position limiting member housing (551) and the fixing ball (552) and applies elastic force to make the fixing ball (552) adhere to the rotating plate (520).

[0132] Additionally, the rotating plate (520) is formed with a depth smaller than that of the horizontal rail position groove (522) and the vertical rail position groove (523), and a fixed ball guide slit (524) is formed to connect the horizontal rail position groove (522) and the vertical rail position groove (523) to guide the movement of the fixed ball (552).

[0133] With this configuration, as shown in FIG. 19, when the rotating plate (520) is rotated by more than a certain force, the fixed ball (552) inserted into the vertical rail positioning groove (523) is disengaged and moves relative to the fixed ball guide slit (524), and when it is positioned in the horizontal rail positioning groove (522), it is inserted into the horizontal rail positioning groove (522) by the elastic force of the fixed ball elastic member (553) and fixed in position.

[0134] That is, if the rotating plate (520) is not rotated by a certain force or more, the rotating plate (520) is not rotated by the position limiting part (550), and the rotating rail (540) is fixed in position to connect the vertical rail (110) or the horizontal rail (120), and when a worker rotates the rotating plate (520) by a certain force or more, the rotating rail (540) can be rotated. At this time, the worker can rotate the rotating rail (540) by holding it with their hand.

[0135] Additionally, the direction changer (500) may further include a rotation limiting pin (560) that limits the rotation of the rotating plate (520), which is connected to the housing (510) and inserted into a rotation limiting slit (525) formed in the rotating plate (520), and when supported at one end of the rotation limiting slit (525), the rotating rail (540) is connected to the vertical rail (110), and when supported at the other end of the rotation limiting slit (525), the rotating rail (540) is connected to the horizontal rail (120).

[0136] That is, the rotation limiting slit (525) is formed in the shape of an arc having a 90-degree angle, and the rotation limiting pin (560) attached to the housing (510) is inserted and positioned. In this state, when the rotating plate (520) rotates in one direction and the rotation limiting pin (560) is supported at one end of the rotation limiting slit (525), the rotating rail (540) is connected to the vertical rail (110), and the fixing ball (552) is inserted into the vertical rail positioning groove (523), thereby fixing the position of the rotating plate (520). Then, when the rotating plate (520) rotates in the other direction and the rotation limiting pin (560) is supported on the other end of the rotation limiting slit (525), the rotating rail (540) is connected to the horizontal rail (120) and the fixing ball (552) is inserted into the horizontal rail positioning groove (522), thereby fixing the position of the rotating plate (520).

[0137] In this way, the position can be set so that the fixed ball (552) can be accurately inserted into the vertical rail position groove (523) or the horizontal rail position groove (522) through the rotation limiting slit (525) and the rotation limiting pin (560).

[0138] Additionally, the direction changing unit (500) may further include a rotating plate sealing member (571) provided between the housing (510) and the rotating plate (520) to block foreign matter from entering the housing (510). Here, the rotating plate sealing member (571) may be formed to be arranged along the circumference of the rotating plate (520).

[0139] By preventing foreign matter from penetrating between the rotating plate (520) and the housing (510) through the rotating plate sealing member (571), the malfunction of the fixed ball (552) can be prevented.

[0140] Furthermore, the direction changer (500) may further include a bush (572) positioned between the inner surface of the rotating plate (520) and the housing (510) to support rotation, and a washer (573) positioned between the outer surface of the rotating plate fastening part (530) and the housing (510) to support rotation.

[0141] That is, the friction between the rotating plate (520) and the housing (510) can be reduced through the bush (572) and the washer (573), allowing the rotating plate (520) to rotate more smoothly. In addition, damage to the housing (510) can be prevented through the bush (572) and the washer (573).

[0142] Additionally, the direction changer (500) may further include a cover portion (574) that is fastened to the outer surface of the housing (51) to cover the rotating plate fastening portion (530) so that it is not exposed to the outside.

[0143] Additionally, the housing (510) has a pair of vertical rail fastening protrusions (513) formed on both sides in the vertical direction to fasten the vertical rail (110), and a pair of horizontal rail fastening protrusions (512) formed on both sides in the horizontal direction to fasten the horizontal rail (120). Here, the horizontal rail fastening protrusions (512) and the vertical rail fastening protrusions (513) are spaced apart to have a 90-degree angle with each other.

[0144] Alternatively, when the direction change unit (500) is installed at the top of the vertical rail (110) as shown in FIG. 20, it may be formed such that only one vertical rail fastening projection (513) is formed on the housing (510) to be fastened to the vertical rail (110). If the vertical rail fastening projection (513) is formed in both directions on the housing (510), the moving unit (130) may detach through the open upper vertical rail fastening projection. To prevent this, when installed at the top of the vertical rail (110), it is preferable to use a housing (510) in which only one vertical rail fastening projection (513) is formed.

[0146] FIGS. 21 and 22 are a perspective view and a plan view schematically illustrating the state in which a grounding unit is installed in the fall prevention device for the steel tower, FIG. 23 is a perspective view schematically illustrating the state in which the grounding cable of the grounding unit is connected to a vertical rail, and FIG. 24 is a drawing schematically illustrating the state in which grounding is performed by the grounding unit.

[0147] Referring to FIGS. 21 to 24, a fall prevention device (100) for a steel tower according to an embodiment of the present invention may further include a grounding unit (600) that grounds the vertical rail (110) by connecting it to the ground. The grounding unit (600) is configured to block floating voltage or induced voltage.

[0148] The above grounding unit (600) may comprise a grounding cable (610) that is electrically connected to the vertical rail (110) through a grounding terminal (611), a grounding plate (620) that is provided as a conductor and buried in the ground and electrically connected to the grounding cable (610), and a plurality of grounding rods (630) that are electrically connected to the grounding plate (620) and buried in a direction perpendicular to the ground.

[0149] Here, floating voltage refers to the voltage that flows through the air due to an electric potential difference between two objects that should not have a voltage difference. Inducing voltage refers to the voltage induced in a surrounding conductor in the opposite direction of the current by a magnetic field generated around a wire when an electric current flows. Methods to block such induced voltage include shielding using metal plates or the like, and creating opposing magnetic fields to cancel each other out.

[0150] In addition, high-frequency electromagnetic waves are radiated into the air as electric and magnetic fields, and when high current flows, a magnetic field is formed in the surroundings, and an electric field is also formed and radiated into the air. Generally, in 345kV and 765kV ultra-high voltage transmission towers, there is a concern for safety accidents involving workers due to partial electric shock caused by the influx of floating voltage when workers climb up, down, or move horizontally on the tower.

[0151] As a result of frequency measurements of the vertical lifeline and the lower part of the existing 154kV transmission tower, it was confirmed that when a wind speed of approximately 20 m / s occurs, the lower part of the tower has a natural vibration frequency in the 40 Hz band, and the lower part of the vertical lifeline has a natural vibration frequency in the 300 Hz band. This indicates that there is a potential difference between the main tower member and the vertical lifeline due to capacitance, and this can cause an electric shock effect on the human body due to current conversion when the human body, which has high resistance, comes into contact with an unspecified location with high capacitance.

[0152] Accordingly, in the present invention, the grounding plate (620) and the grounding rod (630) are made of oxygen-free copper plates, which have excellent electrical conductivity, are free from hydrogen (H2) embrittlement, and have superior processability at room temperature compared to other pure copper products, and are buried underground around the steel tower (10).

[0153] Through this configuration, as illustrated in FIG. 24, when the floating voltage generated through the power line of the pressurized line reaches the vertical rail (110) of the de-energized line, the electric field is rapidly absorbed by utilizing the structure that is integrated from the horizontal rail (120) at the top of the tower (10) to the vertical rail (110) at the bottom, and is discharged to ground through the grounding plate (620) and the grounding rod (630), thereby forming a zero potential and blocking the floating voltage induced in the human body. This is implemented to obtain a high electric shock prevention effect, increase usability, ensure safety, enhance the reliability of high-altitude workers, and reduce psychological fatigue of workers when climbing and moving on the tower (10), thereby ensuring stability.

[0155] Although the present invention has been described in detail through specific embodiments, this is for the purpose of specifically explaining the invention and is not limited thereto. It is evident that modifications or improvements to the present invention are possible by those skilled in the art within the technical scope of the invention.

[0156] All simple variations or modifications of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims. Explanation of the symbols

[0158] 10: Steel tower 11: Vertical frame 12: Horizontal frame 100 : Fall prevention device for steel towers 110 : Vertical rail 120 : Horizontal rail 130 : Moving unit 131: Moving part 132: Fastening hook 133: Carabiner 134: Stopperpin 140 : Closing block 150 : Opening / closing part 151: Opening / closing bracket 151a: Hinge part 151b : Support projection 152 : Opening / closing lever 153 : Open / close elastic member 200 : Bottom fixing unit 210: 1st lowest fixed part 211: Lowest vertical rail fastening part 212: First fastening plate 213: Fastening hole 220: Second lowest fixing part 221: Locking part 222 : Second fastening plate 230 : Anti-slip unit 231 : Body part 232 : Contact part 233 : Receiving groove 234 : Friction ball 235 : Adhesive elastic member 236 : Sealing member 300 : Vertical fixing unit 310 : Base frame 320 : Support frame 330 : Vertical rail fastening part 340 : Step 400 : Horizontal fixing unit 410: Fastening frame 411: Outer frame 412: Inner frame 413: Fastening member 414 : Support block fastening projection 420 : Support block 430: Horizontal rail fastening part 431: Support block fastening frame 431a: Support block fastening hole 432: Horizontal rail fastening frame 432a : Horizontal rail fastening hole 500 : Direction change part 510 : Housing 511 : Through hole 512: Horizontal rail fastening projection 513: Vertical rail fastening projection 520 : Rotating plate 521 : Protrusion 522 : Horizontal rail positioning groove 523 : Vertical rail positioning groove 524 : Fixed ball guide slit 525 : Rotation limiting slit 530 : Rotating plate fastening part 540 : Rotating rail 550 : Location restriction section 551 : Location restriction section housing 552 : Fixed ball 553 : Fixed ball elastic member 560 : Rotation limiting pin 571 : Rotating plate sealing member 572 : Bush 573 : Washer 574 : Cover section 600 : Grounding unit 610 : Grounding cable 611 : Grounding terminal 620: Grounding plate 630: Grounding rod

Claims

Claim 1 A bottom fixing unit installed at the bottom of the vertical frame of a steel tower; a plurality of vertical fixing units spaced apart and fastened along the vertical frame; a vertical rail installed in connection with the bottom fixing unit and the plurality of vertical fixing units; and a moving unit having a rope installed and sliding along the longitudinal direction of the vertical rail, wherein the bottom fixing unit comprises: a first bottom fixing part formed by bending to wrap around one side of the vertical frame and having the vertical rail fastened to one end; and a second bottom fixing part formed by bending to wrap around the other side of the vertical frame and having both ends fastened to the first bottom fixing part and installed on the vertical frame. and includes an anti-slip unit installed through at least one of the first lowest fixing part and the second lowest fixing part, and supported by frictional force on the vertical frame to prevent slipping, wherein the anti-slip unit comprises: a body part fastened to either the first lowest fixing part or the second lowest fixing part; a contact part formed protruding from the body part and adhering to the vertical frame; a friction ball received in a receiving groove formed in the contact part and optionally protruding to the outer surface of the contact part to adher to the vertical frame; a contact elastic member that applies elastic force to cause the friction ball to protrude to the outer surface of the contact part; and a sealing member fastened along the circumference of the body part and adhering to either the first lowest fixing part or the second lowest fixing part to seal, wherein the second lowest fixing part comprises at least one locking part formed by bending in a vertical direction at one end and inserted into a fastening hole formed on one side of the first lowest fixing part to be engaged and supported. A second fastening plate formed by bending in the outer direction of the vertical frame at the other end and positioned to face the first fastening plate of the first lowest fixing part;A fall prevention device for a steel tower comprising a slip prevention unit, wherein the receiving groove is formed such that the friction ball slides, and is formed at an angle such that it does not protrude to the outer surface of the contact portion when the contact elastic member moves in a direction of compression, and protrudes to the outer surface of the contact portion when the contact elastic member elastically returns.

Images