Load-Distributing Fastening Bracket for Preventing Sagging of a Crossarm Fastening Portion in an Overhead Distribution Line

Abstract

A fastening bracket (30) for preventing sagging of the crossarm fastening portion is disclosed in a structure for fixing a crossarm (A) to a utility pole (P), comprising: an adapter (10) that is butted against a utility pole (P) of an overhead power line and is provided with a rectangular slot coupling hole; a crossarm band (23) having fastening bolts (21, 22) that penetrate the adapter (10) and the crossarm (A) with the utility pole (P) in between in a direction opposite to the adapter (10); and fastening nuts (31, 33) that are screw-coupled to the fastening bolts (21, 22) to form a crossarm fastening portion between the crossarm (A) and the adapter (10) while the crossarm (A) is positioned between the adapter (10). The fastening bracket (30) has an adapter support portion (310), a crossarm support portion (320), and a utility pole support portion (330). The adapter support member (310) is provided with slot ribs (311, 315) that are inserted and coupled into slot coupling holes. The reinforcing bar support member (320) has a screw hole formed so that a support bolt can be screwed in at an outer position of the fastening bolt (21, 22) and abutted against the reinforcing bar (A). The pole support member (330) is provided with a left end bending member (331) and a right end bending member (335) that have a triangular shape support structure (T1, T2) formed by symmetrically bending from both the left and right sides of the adapter support member (310) toward the pole side. According to this configuration, the vertical load, bending moment, and rotational load acting on the reinforcing bar fastening member are mitigated from being concentrated around the bolt fastening area, and by transmitting a portion of the load through a support area extended in the longitudinal direction of the reinforcing bar (A), local deformation of the reinforcing bar fastening member and sagging or rotational deformation of the reinforcing bar (A) can be mitigated.

Description

Technology Field

[0001] The present invention relates to a fastening structure for fixing a crossarm to a utility pole of an overhead power distribution line, and more specifically, to a load-distributing fastening bracket installed between a crossarm and a utility pole to support the crossarm. Background Technology

[0002] Generally, in overhead distribution lines, crossarms (or brackets, hereinafter referred to as "crossarms") are installed transversely from utility poles to install insulators, wires, switches, and other distribution equipment. Wire tension, equipment loads, wind loads, and vibration loads act on the crossarms, and these loads are transmitted to the utility poles through the crossarms. The crossarms are typically formed as metal structures and are used in the form of angles or square steel pipes.

[0004] The above-mentioned crossbar is fixed to a utility pole in a detachable manner using a U-band clamp (or crossbar band, hereinafter referred to as "crossbar band") for installation and maintenance purposes. The crossbar band is installed to wrap around the outer surface of the utility pole, and the crossbar is tightly fixed to the utility pole by the fastening force of bolts and nuts. However, since the crossbar is a member extended in the longitudinal direction and the utility pole has a circular outer surface, the contact shapes between the crossbar and the utility pole are different. Accordingly, an adapter is placed between the crossbar and the utility pole, and the adapter is used as an intermediary structure for fastening and supporting the crossbar and the utility pole.

[0006] An example of the above-mentioned crossarm adapter is disclosed in Korean Registered Utility Model No. 20-0335864 (crossarm band structure, hereinafter referred to as "Prior Art 1").

[0008] The aforementioned prior art document 1 discloses an adapter structure in which both ends are bent backward to form a central support. Bolt fastening holes through which fastening bolts pass are provided at both ends. Accordingly, the adapter and the crossarm are fixed to the utility pole by inserting the fastening bolts into the bolt fastening holes with the utility pole in between and then tightening the nuts. However, since space is required for the nut tightening, the ends are formed in a backward-bent shape, and consequently, the central support is placed restrictively in the area between the two fastening bolts. Therefore, it is difficult for the central support to extend and support the outer area of ​​the crossarm, and the load acting on the crossarm may be transmitted mainly around the area surrounding the fastening bolts.

[0010] Furthermore, the aforementioned prior art document 1 discloses a locking projection structure formed by cutting and protruding from a central support portion toward the cross arm. A support groove is formed in the cross arm corresponding to the locking projection, and the position of the cross arm is determined by inserting the locking projection into the support groove. However, since the locking projection is located in the area between the fastening bolts, there are limitations in distributing and supporting the bending and rotational loads acting on the cross arm. Additionally, since mutual positional alignment between the locking projection and the support groove is required, applicability to changes in cross arm specifications or fastening positions may be limited. Moreover, since a separate support groove must be machined on the cross arm, there are limitations in applying it to cross arms of general-purpose specifications.

[0012] Another example of the above-mentioned crossarm adapter is disclosed in Korean Registered Utility Model No. 20-0176391 (crossarm fixing device, hereinafter referred to as "Prior Art 2").

[0014] The aforementioned prior art document 2 discloses an adapter structure that is bent in a corrugated shape such that both ends are positioned on the crossarm side and the central support is positioned on the utility pole side. Bolt fastening holes are provided at both ends, and with the crossarm and adapter positioned on the utility pole, the crossarm and adapter are fixed to the utility pole by inserting the fastening bolts of the crossarm band into the bolt fastening holes and then tightening the nuts. Since the adapter is formed with both ends bent in a forward direction, the area in contact with the crossarm extends to the outer area of ​​the two fastening bolts of the crossarm band. However, since the adapter is not structured to be directly fastened to the fastening bolts of the crossarm band, the contact with the utility pole side and load transfer of the adapter may be affected by the contact state and fastening conditions with the crossarm.

[0016] Meanwhile, various forms of crossarm bands have been proposed as structures for fastening and supporting crossarms to utility poles, and one example is disclosed in Korean Registered Patent No. 10-2417971 (crossarm band for utility poles, hereinafter referred to as "Prior Art 3").

[0018] The aforementioned prior art document 3 discloses a crossarm band structure composed of three band members. The crossarm band consists of one main band and two auxiliary bands, and the auxiliary bands rotate individually at the upper and lower sides of the adapter to be coupled to the utility pole. Accordingly, the adapter is fastened to the utility pole through a plurality of band members. However, since the auxiliary bands are coupled with an individual rotation structure, it is difficult for them to function as a structure that increases the structural rigidity of the fastening part. Furthermore, since the fastening of the crossarm is mainly centered around the fastening bolt of the main band, the load acting on the crossarm can also be transmitted mainly around the fastening part of the main band.

[0020] Another example of the above-mentioned arm brace adapter is disclosed in Korean Registered Patent No. 10-2697220 (Adapter structure of an improved arm brace band, hereinafter referred to as "Prior Art 4").

[0022] The aforementioned prior art document 4 discloses a structure in which an adapter is fixed to one end of two parallel arm ties, and an arm tie band is attached to the other end, and the ties are arranged along the longitudinal direction of a utility pole. Conventional arm ties are connected to a cross arm and fixed diagonally to the utility pole via an arm tie band. In contrast, the arm ties of prior art document 4 are arranged along the utility pole while connected to an adapter and are secured parallel to the utility pole via a band. Accordingly, the arm ties of prior art document 4 can be understood as an auxiliary support structure for extending the pole-side fixing area of ​​the adapter in the longitudinal direction, rather than a structure that forms a diagonal axial force against the load on the outer side of the cross arm. Therefore, the above structure is closer to a structure that assists in maintaining the position of the adapter or securing to the pole side, rather than a structure that directly distributes the load of the cross arm fastening part. Furthermore, prior art document 4 aims to reduce spatial interference that may occur in conventional diagonal installation structures by arranging the arm ties along the longitudinal direction of the utility pole. However, since multiple reinforcing bars, band clamps, and other power distribution equipment are installed along the length of the utility pole, structures that occupy space along the length of the pole may cause placement interference with other equipment or installation space constraints. Prior art literature

[65535] 1. Republic of Korea Registered Utility Model No. 20-0335864 (Published Dec. 11, 2003) 2. Republic of Korea Registered Utility Model No. 20-0176391 (Published Mar. 15, 2000) 3. Republic of Korea Registered Patent No. 10-2417971 (Published July 7, 2022) 4. Republic of Korea Registered Patent No. 10-2697220 (Published Aug. 22, 2024) The problem to be solved

[0024] The present invention was devised to solve the above-mentioned problems and aims to provide a load-distributing fastening bracket capable of mitigating local deformation of the fastening part of the cross arm and sagging or rotational deformation of the cross arm by combining a load-distributing fastening bracket with an adapter of a cross arm band for fixing the cross arm, thereby mitigating the concentration of vertical loads, bending moments, and rotational loads acting on the fastening part of the cross arm around the bolt fastening area, and by transmitting a portion of the said loads through a support area extended in the longitudinal direction of the cross arm. means of solving the problem

[0025] A load-distributing fastening bracket for preventing sagging of a crossarm fastening portion of an overhead power distribution line according to the present invention is provided for preventing sagging of the crossarm fastening portion in a structure for fixing a crossarm to a utility pole, comprising: an adapter that is butted against a utility pole of an overhead power distribution line and is provided with a rectangular slot coupling hole; a crossarm band having a fastening bolt that penetrates the adapter and the crossarm with the utility pole in between in a direction opposite to the adapter; and a fastening nut that is screw-coupled to the fastening bolt while the crossarm is positioned between the adapter and forms a crossarm fastening portion between the crossarm and the adapter. The bracket comprises: an adapter support portion arranged transversely on the adapter, having a slot rib formed protrudingly to be inserted and coupled into the slot coupling hole so as to support the adapter and having a slot hole provided so as to allow the fastening bolt to pass through; and a crossarm support portion having an upper support portion and a lower support portion arranged vertically spaced apart to support the crossarm by being bent and extended from the adapter support portion toward the crossarm side. And it includes a pole support member having a left end bend and a right end bend formed symmetrically in multiple stages from both the left and right sides of the adapter support member in the transverse direction toward the pole side.

[0026] In the upper and lower support members, screw holes are formed so that a support bolt can be screwed into an outer position of the fastening bolt and butted against the crossarm.

[0027] The above-mentioned left and right-mentioned bent portions are multi-stage bent to be abutted against the above-mentioned utility pole to form a triangular support structure.

[0028] The triangular support structure formed in the left and right bending portions, respectively, forms a wedge shape on the cross section that expands toward the pole side.

[0029] In the above-mentioned left and right bent portions, a bolt through-hole is formed so that the fastening bolt can pass through, and the retraction of the left and right bent portions towards the reinforcing side is restricted by engaging a nut fastened to the fastening bolt.

[0030] The upper support member is provided with an upward reinforcing rib that is bent upward toward the outer side of the cross member, and the lower support member is provided with a downward reinforcing rib that is bent downward toward the outer side of the cross member.

[0031] The above left and right bending sections are formed by bending from the adapter support towards the pole side, and comprises: a first bending section welded to the adapter support by having an upper reinforcing bending section bent inward from the top toward the center of the pole and a lower reinforcing bending section bent inward from the bottom toward the center of the pole; a second bending section formed by bending inward from the first bending section toward the center of the pole and welded to the upper reinforcing bending section and the lower reinforcing bending section, respectively, and having a bolt through hole provided therein; a third bending section formed by bending from the second bending section toward the tangential direction of the outer surface of the pole; a fourth bending section formed by bending from the third bending section to form an acute angle; and a fifth bending section formed by extending from the fourth bending section to be abutted against the second bending section and welded to be abutted against the second bending section. Effects of the invention

[0032] The fastening bracket according to the present invention is formed with a structure in which a plate is multi-stage bent and welded together, and is connected to the cross member through a support bolt while extending along the longitudinal direction of the adapter and wrapping around the adapter, and is connected to the adapter through a slot rib, and the pole support member, which is formed extending from both sides of the adapter toward the pole side, is butted against both sides of the pole, so that a portion of the vertical load, bending moment, and rotational load acting on the cross member fastening part is transmitted through the support area extended along the longitudinal direction of the cross member, thereby alleviating local loads concentrated around the fastening bolt of the cross member band, and can alleviate sagging and rotational deformation of the cross member by expanding the support range for the outer area of ​​the cross member, and can reduce the longitudinal space occupation of the pole by utilizing the cross-sectional space between the cross member and the pole. Brief explanation of the drawing

[0033] FIG. 1 is a perspective view illustrating a single-arm steel system in which a steel bar is installed on a utility pole by means of a fastening bracket and a steel bar band assembly including the same, as a preferred embodiment according to the present invention; FIG. 2 is an exploded perspective view illustrating the steel bar band assembly of FIG. 1 separated; FIG. 3 is an enlarged perspective view illustrating the adapter of FIG. 2; FIG. 4 is an enlarged perspective view illustrating the fastening bracket of FIG. 2; FIG. 5 is a plan view illustrating the fastening bracket of FIG. 4; FIG. 6 is an unfolded view illustrating the fastening bracket of FIG. 4 unfolded; FIG. 7 is a cross-sectional view of the single-arm steel system of FIG. 1 along the XX line of FIG. 8; FIG. 8 is a front view of the single-arm steel system of FIG. 1. Specific details for implementing the invention

[0034] In the field of the present invention, insulators, wires, switches, and other distribution equipment are installed on various types of angle or rectangular crossarms in overhead distribution lines. For convenience of explanation, the present invention illustrates and describes a straight rectangular crossarm as an example, and the illustration and description of insulators, wires, switches, and other distribution equipment are omitted. Additionally, for convenience of explanation, the crossarm is illustrated with parts of both sides in the longitudinal direction omitted, and the utility pole is illustrated and described with parts of the vertical direction omitted. Directions are defined for the explanation of the present invention. Rectangular unit members are referred to as the "width direction," "height direction," and "length direction" based on the width, height, and extended length of the cross-section, and circular unit members are referred to as the "radial direction" and "tangential direction" based on the radius and tangent. In addition, in the description of a structure in which unit members are combined, the direction of the length of the pole is referred to as the "longitudinal direction," the direction in which the crossbar extends from the pole is referred to as the "transverse direction," and the direction perpendicular to the longitudinal and transverse directions based on the fastening direction of the crossbar band is referred to as the "front-back direction."

[0036] Hereinafter, a fastening bracket for preventing sagging of a crossarm fastening portion of an overhead power distribution line, as a preferred embodiment according to the present invention, will be described in more detail with reference to the attached drawings. In the drawings, the same reference numerals denote components of the same function.

[0038] FIG. 1 is a perspective view illustrating a single-arm system in which an arm is installed on a utility pole by means of a fastening bracket and an arm band assembly including the same, as a preferred embodiment according to the present invention.

[0040] The above-mentioned cross member (A) is an example of a square steel pipe known in the field of the present invention. The above-mentioned cross member (A) is formed by bending a steel plate and welding the ends so that it can be used universally, and slot fastening holes (S1, S2) are provided on the front and rear sides so that fastening bolts (21, 22) of the cross member band (20) can pass through.

[0042] The above-mentioned pole (P) is made of concrete or steel pipe in the field of the present invention, and the illustrated example is an example of a concrete pole having a circular outer surface.

[0044] FIG. 2 is an exploded perspective view showing the crossarm band assembly of FIG. 1 separated. Here, the outer surface of the pole is shown in dashed lines.

[0046] Referring to FIGS. 1 and 2, a preferred arm band assembly (1) according to the present invention comprises an adapter (10), a fastening bracket (30), an arm band (20), a fastening nut (31, 33), and a fixing nut (41, 43).

[0048] The above-described crossarm band (20) consists of a band portion (23) formed as a curved surface to be in contact with the outer surface of a utility pole (P), and two fastening bolts (21, 22) integrally welded to both ends of the band portion (23). The illustrated example is an example of a crossarm band (20) applied to a single crossarm system (PS) in which a crossarm (A) is installed on one side of a utility pole (P). Fastening nuts (31, 33) are screw-fastened to the fastening bolts (21, 22) to secure the crossarm (A).

[0050] FIG. 3 is an enlarged perspective view of the adapter of FIG. 2. Here, the outer surface of the utility pole is shown as a dashed line.

[0052] Referring to FIGS. 1 to 3, the adapter (10) is formed with a height corresponding to the height of the reinforcing bar and is equipped with a central support (11), a bent extension (13, 15), and two end support (17, 19). The adapter (10) is formed by bending a thick plate into a corrugated shape, and bent ribs (10a, 10b) are formed along the longitudinal direction at both the upper and lower ends.

[0054] The central support member (11) is formed as a curved surface to be in contact with the outer surface of the main column (P). The two end support members (17, 19) are formed to be integrally extended from both ends of the central support member (11) and to be in contact with the reinforcing bar (A), and are provided with rectangular slot coupling holes (S3, S4) extended in the longitudinal direction. The bent extension members (13, 15) are formed by being bent and extended between the central support member (11) and the two end support members (17, 19) by press processing. The two end support members (17, 19) are formed in a flat shape to provide a contact area extended along the longitudinal direction of the reinforcing bar (A).

[0056] In a structure for fixing a cross arm (A) to a utility pole (P), comprising an adapter (10) that is butted against a utility pole (P) of an overhead power line and has rectangular slot coupling holes (S3, S4), a cross arm band (20) having fastening bolts (21, 22) that penetrate the adapter (10) and the cross arm (A) with the utility pole (P) in between in a direction opposite to the adapter (10), and fastening nuts (31, 33) that form a cross arm fastening part by screwing into the fastening bolts (21, 22) while the cross arm (A) is positioned between the adapter (10), a fastening bracket (30) for preventing sagging of the cross arm fastening part is described in more detail below.

[0058] FIG. 4 is an enlarged perspective view of the fastening bracket of FIG. 2. Here, the outer circle of the utility pole is shown as a dashed line.

[0060] Referring to FIGS. 2 and 4, the fastening bracket (30) comprises an adapter support (310) positioned in the center, a reinforcing bar support (320) that is bent and extended from the adapter support (310) toward the reinforcing bar (A) and spaced apart vertically, and a pole support (330) that is bent and extended from both sides of the adapter support (310) toward the pole (P).

[0062] FIG. 5 is a plan view illustrating the fastening bracket of FIG. 4, and FIG. 6 is an unfolded view illustrating the fastening bracket of FIG. 4. In FIG. 4, the outer circumference of the utility pole is shown as a dashed line, and in FIG. 5, the bending line is shown as a dashed line.

[0064] Referring to FIGS. 2 to 6, the fastening bracket (30) is formed by bending a single steel plate by press processing.

[0066] The adapter support member (310) is arranged transversely on the adapter (10), and slot ribs (311, 315) that are inserted and coupled into the slot coupling holes (S3, S4) of the adapter (10) are formed protruding toward the front column (P) from both the left and right sides in the longitudinal direction. The slot ribs (311, 315) are integrally formed on the adapter support member (310) to correspond to the slot coupling holes (S3, S4) at the positions where the adapter support member (310) and the adapter (10) meet, and slot holes (S5, S6) are provided so that fastening bolts (21, 22) can pass through.

[0068] The above-mentioned reinforcing bar support member (320) is composed of an upper support member (321) and a lower support member (325) that are vertically spaced apart and extended from the adapter support member (310) toward the reinforcing bar side to support the reinforcing bar (A).

[0070] The upper support member (321) and lower support member (325) are formed to extend in the lateral direction to the outer region of the slot coupling hole (S3, S4) or fastening bolt (21, 22) of the adapter (10), and it is preferable that they are formed to extend forward of the centerline in the width direction of the reinforcing member (A) so as to wrap around and support the reinforcing member (A).

[0072] In the upper support member (321), four upper screw holes (321a, 321b, 321c, 321d) are spaced apart so that two upper support bolts (421a, 421b, 421c, 421d) are screw-coupled to the left and right outer sides in the longitudinal direction of the slot coupling holes (S3, S4) of the adapter (10) so that they can be abutted against the crossarm (A). In addition, in the lower support member (325), four lower screw holes (325a, 325b, 325c, 325d) are spaced apart at positions corresponding to the upper screw holes (321a, 321b, 321c, 321d) so that two lower support bolts (425a, 425b, 425c, 425d) are screw-coupled to the left and right outer sides so that they can be abutted against the crossarm (A). Here, it is preferable that the upper screw holes (321a, 321b, 321c, 321d) and lower screw holes (325a, 325b, 325c, 325d) are spaced apart in the longitudinal direction along the centerline of the reinforcing bar (A).

[0074] An upward reinforcing rib (323) and a downward reinforcing rib (327) may be formed in the above reinforcing member support (320) to secure an insertion space for the reinforcing member (A). The upward reinforcing rib (323) is formed by bending upward from the upper support member (321) toward the outside of the reinforcing member (A), and the downward reinforcing rib (327) is formed by bending downward from the lower support member (325) toward the outside of the reinforcing member (A).

[0076] The above-mentioned pole support member (330) is composed of a left-end bending member (331) and a right-end bending member (335) that are symmetrically bent in multiple stages toward the pole side so as to be supported from both the left and right sides of the adapter support member (310) in the lateral direction toward the pole (P). The left-end bending member (331) and the right-end bending member (335) are arranged to correspond to both sides of the outer surface of the pole (P), respectively, centered on the adapter support member (310).

[0078] The above left bending section (331) and right bending section (335) are each formed by bending five times along the bending line (see dashed line in FIG. 5). The first bending section (331a, 335a) is bent from the adapter support section (310) toward the pole (P) in the front-rear direction, and the second bending section (331b, 335b) is bent inward from the first bending section (331a, 335a) toward the center of the pole (P) in the transverse direction. The 3rd bend section (331c, 335c) is bent outward from the 2nd bend section (331b, 335b) in a tangential direction toward the outer surface of the column (P), and the 4th bend section (331d, 335d) is bent obliquely from the 3rd bend section (331c, 335c) toward the 2nd bend section (331b, 335b) at an acute angle or with the same bending length. Additionally, the 5th bend section (331e, 335e) is formed by extending the bend from the 4th bend section (331d, 335d) so as to be butted close to the 2nd bend section (331b, 335b), and is welded and fixed integrally with the 2nd bend section (331b, 335b) as a subsequent process after the bending process. Unexplained "W11" is a weld between the 2nd bend section (331b) and the 5th bend section (331e) in the left bend section (331), and "W12" is a weld between the 2nd bend section (335b) and the 5th bend section (335e) in the right bend section (335). Here, the 5th bend section (331e, 335e) can be omitted, and the 4th bend section (331d, 335d) and the 2nd bend section (331b, 335b) can be welded and fixed in a butt-to-butt state according to the 4th bend. However, considering structural rigidity, it is preferable to perform the 5th bend as shown in the illustrated example.

[0080] In the above left end bending portion (331) and right end bending portion (335), the 2nd stage bending portion (331b, 335b), 3rd stage bending portion (331c, 335c), and 4th stage bending portion (331d, 335d) are multi-stage bent to be abutted against the utility pole (P) as shown in FIGS. 4 and 5 to form a triangular shape support structure (T1, T2), and the triangular shape support structure (T1, T2) forms a wedge shape that expands toward the utility pole on the cross section.

[0082] In the first bending section (331a, 335a) of the left bending section (331) and the right bending section (335) above, reinforcing bending sections (331f, 331g, 335f, 335g) may be formed in the upper and lower portions in the longitudinal direction, respectively. To this end, an upper reinforcing bending section (331f, 335f) that is bent inward from the transverse direction toward the center of the pole (P) is formed in the upper portion of the first bending section (331a, 335a), and a lower reinforcing bending section (331g, 335g) that is bent inward from the transverse direction toward the center of the pole (P) is formed in the lower portion. After the bending process, as a subsequent process, the adapter support part (310), the reinforcing bending part (331f, 331g, 335f, 335g), and the reinforcing bending part (331f, 331g, 335f, 335g) and the 2-stage bending part (331b, 335b) are each welded and fixed as a single unit. Unexplained “W21” is a weld between the upper reinforcing bend (331f) of the left end bend (331) and the second bend (331b), “W22” is a weld between the upper reinforcing bend (331f) of the left end bend (331) and the adapter support (310), “W23” is a weld between the upper reinforcing bend (335f) of the right end bend (335) and the second bend (335b), and “W24” is a weld between the upper reinforcing bend (335f) of the right end bend (335) and the adapter support (310). Here, the weld between the lower reinforcing bend (331g, 335g), the adapter support (310), and the two-stage bend (331b, 335b) is identical to "W21", "W22", "W23" and "W24", but is not shown as only the vertical position in the longitudinal direction is different.

[0084] In the above-mentioned left end bending portion (331) and right end bending portion (335), bolt holes (S7, S8) that penetrate to allow fastening bolts (21, 22) of the reinforcing band (20) to pass through, and band holes (H1, H2) that allow the band portion (23) of the reinforcing band (20) to pass through are formed. Here, it is preferable that the bolt holes (S7, S8) are formed with a size corresponding to the slot holes (S5, S6) defined by the slot ribs (311, 315), and that the band holes (H1, H2) are formed to have a height corresponding to the width of the band portion (23) and a width corresponding to the slot holes (S5, S6). In the illustrated example, the bolt through-holes (S7, S8) are provided in the 2nd bend section (331b, 335b), and the band through-holes (H1, H2) are formed across the 3rd bend section (331c, 335c) and the 4th bend section (331d, 335d). Here, the bolt through-holes (S7, S8) allow the fastening bolts (21, 22) to pass through, and at the same time, the fixing nuts (41, 43) are fastened to the fastening bolts (21, 22) and the two-stage bending portions (331b, 335b) are pressed, thereby causing the two-stage bending portions (331b, 335b) to be caught on the fixing nuts (41, 43), thereby restricting the retraction of the left-stage bending portion (331) and the right-stage bending portion (335), more specifically the triangular shape support structure (T1, T2) to be restricted.

[0086] A single-sided steel plate system for installing steel plates on a utility pole using a fastening bracket and a steel plate band assembly including the same is described as a preferred embodiment according to the present invention.

[0088] Figure 7 is a cross-sectional view of the single-arm system of Figure 1 along the XX line of Figure 8.

[0090] Referring to FIGS. 2, 4 to 7, slot ribs (311, 315) formed on the adapter support portion (310) of the fastening bracket (30) are inserted and coupled into the slot coupling holes (S3, S4) of the adapter (10). At this time, the slot ribs (311, 315) are inserted and coupled into the slot coupling holes (S3, S4), thereby aligning the relative positions of the adapter (10) and the fastening bracket (30). Then, with the band portion (23) of the reinforcing band (20) positioned to wrap around the outer surface of the utility pole (P), fastening bolts (21, 22) are passed through the bolt holes (S7, S8) of the utility pole support portion (330). Subsequently, fixing nuts (41, 43) are screwed onto the fastening bolts (21, 22) to fix their position on the outside of the bolt holes (S7, S8). The above fixing nuts (41, 43) are fastened while pressing the two-stage bending portions (331b, 335b), thereby restricting the triangular shape support structure (T1, T2) from retracting toward the crossarm. At this time, the central support portion (11) of the adapter (10) is positioned close to the outer surface of the utility pole (P), and the two end support portions (17, 19) are positioned in a state of surface contact with the adapter support portion (310) of the fastening bracket (30). In addition, the left end bending portion (331) and the right end bending portion (335) are positioned in a state of butting against the outer surface of both sides of the utility pole (P). Reference numerals "35" and "37", which are not described in FIG. 7, represent fastening washers of the fastening nuts (31, 33), and reference numerals "45" and "47" represent fixing washers of the fixing nuts (41, 43).

[0092] The adapter support portion (310) of the above-mentioned fastening bracket (30) is provided with slot holes (S5, S6) defined by slot ribs (311, 315), and the cross member (A) is inserted between the upper support portion (321) and the lower support portion (325) of the cross member support portion (320) so that the slot holes (S5, S6) communicate with the slot fastening holes (S1, S2) of the cross member (A). Afterwards, fastening bolts (21, 22) are made to pass through the slot holes (S5, S6) and the slot fastening holes (S1, S2).

[0094] When the above fastening bolts (21, 22) are exposed to the front side of the reinforcing bar (A) through the slot fastening holes (S1, S2), the fastening nuts (31, 33) are connected to the fastening bolts (21, 22) to fix the reinforcing bar (A).

[0096] Fig. 8 is a front view illustrating the armrest system of Fig. 1.

[0098] Referring to FIGS. 6 and 8, when the reinforcing bar (A) is inserted into the upper support member (321) and the lower support member (325), the upper support member (321) and the lower support member (325) are provided with two upper screw holes (321a, 321b, 321c, 321d) and two lower screw holes (325a, 325b, 325c, 325d) respectively on the left and right outer sides in the longitudinal direction. Support bolts (421a, 421b, 421c, 421d, 425a, 425b, 425c, 425d) are connected to each of the screw holes (321a, 321b, 321c, 321d, 325a, 325b, 325c, 325d). At this time, the support bolts (421a, 421b, 421c, 421d, 425a, 425b, 425c, 425d) are tightened so as to be pressed against the outer surface of the crossarm (A), thereby directly supporting the crossarm (A) in the vertical direction with the fastening bolts (21, 22) at the center, and supporting the crossarm (A) in the horizontal direction from the outside of both fastening bolts (21, 22).

[0100] As a preferred embodiment according to the present invention, the effects of the fastening bracket and the arm band assembly including the same are described.

[0102] Referring to FIG. 7, in the fastening bracket (30) according to the present invention, slot ribs (311, 315) formed in the adapter support portion (310) are inserted and coupled into the slot coupling holes (S3, S4) of the adapter (10) so that the relative positions of the fastening bracket (30) and the adapter (10) can be aligned, thereby suppressing eccentric assembly and relative rotation of the fastening bracket (30). Furthermore, since the slot ribs (311, 315) are inserted and coupled in a shape corresponding to the slot coupling holes (S3, S4), the assembly position of the fastening bracket (30) can be maintained constant. Moreover, since the slot ribs (311, 315) are integrally molded to protrude from the adapter support portion (310), relative movement and relative rotation of the adapter (10) and the fastening bracket (30) can be restricted. Accordingly, the shear load acting on the fastening bolts (21, 22) can be reduced.

[0104] Referring to FIG. 7, the left end bend (331) and the right end bend (335) of the pole support member (330) are abutted against the outer surface of the pole (P) in a state where they form a triangular support structure (T1, T2) by a multi-stage bending structure. Accordingly, a portion of the load acting on the crossarm (A) can be transmitted to the pole (P) side through the pole support member (330). Furthermore, since the left end bend (331) and the right end bend (335) are bent symmetrically with respect to each other and form a wedge shape that expands toward the pole (P), support stability can be secured for the outer surface of the pole (P). In addition, since the left end bend (331) and the right end bend (335) are arranged symmetrically with respect to each other, the eccentric load acting on the crossarm (A) can be distributed to both sides. In addition, since the state of being in close contact with the pole (P) can be maintained by the fastening force of the fastening bolts (21, 22), some of the vertical load, bending load, and rotational load acting on the pole fastening part where the pole (A) and the adapter (10) are fastened can be distributed to the pole (P) side. In addition, since the triangular shape support structure (T1, T2) forms an inclined support structure on the outer surface of the pole (P), local deformation acting on the pole support part (330) can be reduced.

[0106] Referring to FIG. 7, bolt holes (S7, S8) are formed in the pole support member (330) so that fastening bolts (21, 22) can pass through. Since the pole support member (330) has a multi-stage bending structure, space utilization can be secured and cross-sectional rigidity can be secured compared to a flat plate structure. Therefore, since the fixing nuts (41, 43) can be fastened while pressing the pole support member (330), the retraction of the triangular support structure (T1, T2) toward the crossarm (A) can be restricted.

[0108] Referring to FIG. 5, the pole support member (330) can be formed by multi-stage bending and the bending members can be formed to be adjacent and butted together. Accordingly, the bending members that butt together, particularly the 2nd stage bending member (331b, 335b), the 5th stage bending member (331e, 335e), and the reinforcing bending member (331f, 335f), can be welded and fixed, thereby securing structural rigidity while suppressing local deformation of the pole support member (330). In particular, since the butted bending members can form a closed structure by being welded and fixed together, the torsional rigidity of the pole support member (330) can be secured.

[0110] Referring to FIG. 8, the reinforcing member (320) of the fastening bracket (30) supports the reinforcing member (A) in the vertical direction, and at the same time, the support bolts (421a, 421b, 421c, 421d, 425a, 425b, 425c, 425d) press against the outer surface of the reinforcing member (A), thereby suppressing the movement and rotation of the reinforcing member (A). In particular, since the support bolts (421a, 421b, 421c, 421d, 425a, 425b, 425c, 425d) support the reinforcing member (A) from the outside of the fastening bolts (21, 22), the load concentrated on the reinforcing member fastening part can be distributed to the outer area of ​​the reinforcing member (A). In addition, since the support bolts (421a, 421b, 421c, 421d, 425a, 425b, 425c, 425d) are pressurized and supported in the outer region of the reinforcing bar (A), the rotational moment generated around the fastening bolts (21, 22) can be reduced.

[0112] As described above, a load-distributing fastening bracket for preventing sagging of a crossarm fastening portion of an overhead power distribution line and a crossarm band assembly including the same have been described and illustrated in more detail as preferred embodiments according to the present invention. The fastening bracket according to the present invention should be understood as a preferred embodiment and is not limited thereto, and various modifications and changes may be made. The scope of rights of the fastening bracket according to the present invention should be determined by the patent claims defining the matters to be protected. Explanation of the symbols

[0113] 1 : Crossarm band assembly 10 : Adapter 10a, 10b : Bending rib 11 : Central support 13, 15 : Bending extension 17, 19 : Both end supports 20 : Crossarm band 21, 22 : Fastening bolt 23 : Band part 30 : Fastening bracket 31, 33 : Fastening nut 35, 37 : Fastening washer 41, 43 : Fixing nut 45, 47 : Fixing washer 310 : Adapter support 311, 315 : Slot rib 320 : Crossarm support 321 : Upper support 321a, 321b, 321c, 321d : Upper screw hole 323 : Upward reinforcing rib 325 : Lower support 325a, 325b, 325c, 325d : Lower screw hole 327 : Downward reinforcing rib 330 : Utility pole support 331 : Left end Bend section 331a, 335a : 1st bend section 331b, 335b : 2nd bend section 331c, 335c : 3rd bend section 331d, 335d : 4th bend section 331e, 335e : 5th bend section 331f, 335f : Upper reinforcement bend section 331g, 335g : Lower reinforcement bend section 335 : Right-side bend section 421a, 421b, 421c, 421d : Upper support bolt 425a, 425b, 425c, 425d : Lower support bolt A : Crossarm H1, H2 : Band through hole P : Pole PS : Single crossarm system S1, S2 : Slot fastening hole S3, S4 : Slot coupling hole S5, S6 : Slot hole S7, S8 : Bolt through hole T1, T2 : Triangle Shape support structure

Claims

Claim 1 A structure for fixing a cross arm (A) to a utility pole (P), comprising: an adapter (10) that is abutted against a utility pole (P) of an overhead power line and is provided with rectangular slot coupling holes (S3, S4); a cross arm band (20) having fastening bolts (21, 22) that penetrate the adapter (10) and the cross arm (A) with the utility pole (P) in between in a direction opposite to the adapter (10); and fastening nuts (31, 33) that are screw-coupled to the fastening bolts (21, 22) to form a cross arm fastening portion between the cross arm (A) and the adapter (10) while the cross arm (A) is positioned between the adapter (10), thereby preventing sagging of the cross arm fastening portion: a slot rib (311, 315) that is formed protrudingly to be inserted and coupled into the slot coupling holes (S3, S4) so ​​as to support the adapter (10) and is provided with slot holes (S5, S6) so that the fastening bolts (21, 22) can pass through. An adapter support member (310) provided and arranged transversely on the adapter (10); a reinforcing bar support member (320) having an upper support member (321) and a lower support member (325) arranged vertically spaced apart to support the reinforcing bar (A) by being bent and extended from the adapter support member (310) toward the reinforcing bar side; and a pole support member (330) having a left end bending member (331) and a right end bending member (335) formed by being symmetrically bent in multiple stages from both the left and right sides of the adapter support member (310) toward the pole side;It includes, wherein the upper support member (321) and the lower support member (325) have screw holes (321a, 321b, 321c, 421d, 425a, 425b, 425c, 425d) formed so that support bolts (421a, 421b, 421c, 421d, 325a, 325b, 325c, 325d) can be screw-coupled at an outer position of the fastening bolts (21, 22) and abut against the reinforcing bar (A); the left end bending member (331) and the right end bending member (335) are each formed by multi-stage bending to abut against the utility pole (P) to form a triangular support structure (T1, T2), and form a wedge shape that expands toward the utility pole on the cross section; and the left end bending member (331) and the right end bending member (335) are the adapter A first bending section (331a, 335a) is formed by bending from the support section (310) toward the pole side and is provided with an upper reinforcing bending section (331f, 335f) that is bent inward from the top toward the center of the pole and a lower reinforcing bending section (331g, 335g) that is bent inward from the bottom toward the center of the pole and is welded to the adapter support section (310); a first bending section (331a, 335a) is formed by bending inward from the first bending section (331a, 335a) toward the center of the pole and is welded and fixed to the upper reinforcing bending section (331f, 335f) and the lower reinforcing bending section (331g, 335g), respectively, and is formed so that the fastening bolt (21, 22) can pass through and is caught on a fixing nut (41, 43) fastened to the fastening bolt (21, 22) to restrict the retraction of the left bending section (331) and the right bending section (335) toward the crossarm side. A second bending section (331b, 335b) in which bolt holes (S7, S8) are formed; a third bending section (331c, 335c) formed by bending from the second bending section (331b, 335b) toward the tangential direction of the outer surface of the pole (P); and a fourth bending section (331d, 335d) formed by bending from the third bending section (331c, 335c) to form an acute angle;A load-distributing type for preventing sagging of a crossarm fastening part of an overhead power distribution line, characterized by comprising: a 5th bending part (331e, 335e) that is extended and bent to be abutted against a 2nd bending part (331b, 335b) from the 4th bending part (331d, 335d) and welded and fixed in a state abutted against the 2nd bending part (331b, 335b); wherein the crossarm band (20) is composed of a band part (23) formed as a curved surface to be abutted against the outer circumference of the utility pole (P), and two fastening bolts (21, 22) integrally welded to both ends of the band part (23); and band through holes (H1, H2) through which the band part (23) of the crossarm band (20) passes are formed in the left bending part (331) and the right bending part (335). Fastening bracket.;

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