US20080092478A1 - Friction type retrofitting device for steel tower structures - Google Patents
Friction type retrofitting device for steel tower structures Download PDFInfo
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- US20080092478A1 US20080092478A1 US11/636,158 US63615806A US2008092478A1 US 20080092478 A1 US20080092478 A1 US 20080092478A1 US 63615806 A US63615806 A US 63615806A US 2008092478 A1 US2008092478 A1 US 2008092478A1
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- steel tower
- slot
- friction
- outer column
- post
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
- E04H12/10—Truss-like structures
Definitions
- the present invention relates generally to a friction type retrofitting device for steel tower structures. More particularly, the present invention relates to a friction type retrofitting device for a steel tower, such as a power-transmission tower that transmits high voltage to a distant place, in which a slot and a friction plate are provided on a coupling part between columns constituting a post of the steel tower, thus attenuating vibrations generated by wind force acting on the steel tower.
- a friction type retrofitting device for a steel tower such as a power-transmission tower that transmits high voltage to a distant place, in which a slot and a friction plate are provided on a coupling part between columns constituting a post of the steel tower, thus attenuating vibrations generated by wind force acting on the steel tower.
- FIG. 1 is a front view showing a general steel tower
- FIG. 2 is a side view showing the steel tower of FIG. 1 , when wind acts on the front of the steel tower
- FIG. 3 is a detailed view showing part of a post of the steel tower
- FIG. 4 is a view showing the structural change of the conventional post under the condition of FIG. 2 .
- a general steel tower especially a power-transmission tower 10 for transmitting high voltage, includes a frame 70 which is set up vertically, arms 20 which are horizontally provided on the upper portion of the frame 70 , insulators 30 which hang downwards from ends of the arms 20 , and electric wires 40 which are connected to the lower ends of the corresponding insulators 30 .
- the frame 70 includes four vertical posts 50 , and cross members 60 which are crossed between the vertical posts 50 to be coupled to the vertical posts 50 .
- each post 50 of the power-transmission tower 10 has a cruciform section.
- the cruciform section is formed by contacting edges of L-shaped columns 52 and 54 with each other and positioning the remaining parts of the columns 52 and 54 to be opposite to each other.
- the inner column 52 faces the interior of the power-transmission tower 10
- the outer column 54 faces the exterior of the power-transmission tower 10 and has on predetermined portions thereof coupling parts 90 .
- Each coupling part 90 of the conventional power-transmission tower includes first holes 92 and second holes 93 which are formed in the inner column 52 and the outer column 54 , respectively, an angle bracket 94 which has an “L”-shaped section and is provided with third holes 96 and fourth holes 99 , first bolts 98 which pass through the first holes 92 and the third holes 96 , second bolts 100 which pass through the second holes 93 and the fourth holes 99 , first nuts 97 which are fastened to the first bolts 98 , second nuts 102 which are fastened to the second bolts 100 , and washers 88 which are provided in front of the first nuts 97 .
- the outer column 54 is provided at an outer position relative to the inner column 52 .
- the outer column 54 provided at a position facing the wind 80 is extended further than the inner column 52 .
- the outer column 54 provided at the opposite side is compressed more than the inner column 52 .
- the post is apt to buckle, that is, bend suddenly, when the compressive load acting on both ends of the post reaches a predetermined level.
- an object of the present invention is to provide a steel tower structure, in which coupling parts are mounted to posts of a steel tower at proper intervals, thus preventing the posts from buckling, a slot is formed in a coupling part of an outer column, and a friction plate is coupled to the coupling part of the outer column, thus absorbing wind energy using friction energy, therefore enhancing durability.
- the present invention provides a friction type retrofitting device for steel tower structures, including a coupling part coupling an outer column and an inner column of a post of a steel tower to each other using an angle bracket and a bolt, a slot formed in a portion of the outer column to which the coupling part is coupled, and a friction plate provided to contact an outer circumferential surface of the slot.
- a coupling part coupling an outer column and an inner column of a post of a steel tower to each other using an angle bracket and a bolt
- a slot formed in a portion of the outer column to which the coupling part is coupled
- a friction plate provided to contact an outer circumferential surface of the slot.
- a horizontal section of the post has a cross shape
- a horizontal section of each of the outer column and the inner column has an L shape.
- a plurality of coupling parts having the slot in the outer column may be provided on the post, and the friction plate may be provided on one of the coupling parts.
- a reinforcing plate may be provided on a portion of the outer column to which the coupling part is coupled.
- the present invention provides a friction type retrofitting device for steel tower structures, including an outer column which is arranged to be parallel to an inner column, thus providing a post of a steel tower, and is divided at a predetermined position into two portions, a slot which is formed in one of the divided portions, and a friction plate which is provided to contact an outer circumferential surface of the slot.
- wind energy transmitted to the steel tower is attenuated by friction between the slot and the friction plate.
- a horizontal section of the post has a cross shape
- a horizontal section of each of the outer column and the inner column has an L shape.
- a plurality of coupling parts is provided to couple the outer column to the inner column using an angle bracket and a bolt, with a slot formed in a portion of the outer column to which the coupling part is coupled.
- FIG. 1 is a front view showing a general steel tower
- FIG. 2 is a side view showing the steel tower of FIG. 1 , when wind acts on the front of the steel tower;
- FIG. 3 is a detailed view showing part of a post of the steel tower
- FIG. 4 is a view showing the structural change of the conventional post under the condition of FIG. 2 ;
- FIG. 5 is a detailed view showing a post of a steel tower, according to an embodiment of the present invention.
- FIGS. 6 a and 6 b are views showing the operation of the post of the steel tower of FIG. 5 ;
- FIG. 7 is a detailed view showing a post of a steel tower, according to another embodiment the present invention.
- FIGS. 8 a and 8 b are views showing the operation of the post of the steel tower of FIG. 7 .
- the first embodiment of the present invention is as follows.
- FIG. 5 is a detailed view showing a steel tower, according to an embodiment of the present invention.
- a friction type retrofitting device for steel tower structures includes coupling parts 900 , slots 925 , and friction plates 1000 (see portion D of FIG. 5 ).
- the coupling parts 900 couple an outer column 540 and an inner column 520 of each post 530 of the steel tower to each other using angle brackets 940 and bolts 980 and 982 .
- Each slot 925 is formed in a portion of the outer column 540 to which the coupling part 900 is coupled.
- the friction plate 1000 is provided to contact the outer circumferential surface of the corresponding slot 925 .
- each post 530 has a cross shape
- the horizontal section of each of the outer column 540 and the inner column 520 has an L shape
- each post 530 When the length of each post 530 is larger than the sectional area, and compressive load applied to both ends of the post 530 reaches a predetermined level, buckling may occur, that is, the post 530 may suddenly bend.
- a proper number of coupling parts 900 is provided in the longitudinal direction of each post 530 .
- the upper coupling part 900 marked by A, has first holes 920 which are formed in the outer column 540 , and second holes 930 which are formed in the inner column 520 .
- Two first reinforcing plates 965 are provided to contact the first holes 920 and the second holes 930 .
- An angle bracket 940 is provided to contact the first reinforcing plates 965 .
- Third holes 960 and fourth holes 990 are formed in the angle bracket 940 .
- Fifth holes 962 and sixth holes 992 are formed in the reinforcing plates 965 .
- the angle bracket 940 is provided to one side of the outer column 540 , and first washers 880 and first nuts 970 are provided to the side opposite the angle bracket 940 .
- the angle bracket 940 is provided to one side of the inner column 520 , and second washers 882 and second nuts 972 are provided to the side opposite the angle bracket 940 .
- the coupling part 900 marked by A is provided with first bolts 980 which sequentially pass through the third holes 960 , the fifth holes 962 , the first holes 920 , and the first washers 880 , and are fastened to the first nuts 970 .
- the coupling part 900 marked by A is also provided with second bolts 982 which sequentially pass through the fourth holes 990 , the sixth holes 992 , the second holes 930 , and the second washers 882 , and are fastened to the second nuts 972 .
- the coupling parts 900 that are marked by B and C and are provided at a middle position have the same structure as the coupling part 900 marked by A except that the slot 925 is formed in the outer column 540 in place of the first holes 920 , and a second reinforcing plate 967 is additionally provided in back of the slot 925 .
- the coupling part 900 marked by D and provided at a lower position has the same structure as the coupling parts 900 marked by B and C, except that the first friction plate 1000 is provided between the front of the slot 925 and the angle bracket 940 in place of the first reinforcing plate 965 , and a second friction plate 1010 is provided between the back of the slot 925 and the second reinforcing plate 967 .
- each of the first and second reinforcing plates 965 and 967 is made of steel having a low frictional coefficient.
- Each of the first and second friction plates 1000 and 1010 is made of brass having a high frictional coefficient.
- a plurality of coupling parts 900 having the slots 925 in the outer column 540 is provided on each post 530 .
- the friction plate 1000 is provided on one of the coupling parts 900
- the reinforcing plate 965 is provided on the outer column 540 of the coupling part 900 .
- FIGS. 6 a and 6 b are views showing the operation of the posts of the steel tower of FIG. 5 .
- the coupling part 900 marked by A is a locking coupling part
- the coupling parts 900 marked by B and C are buckling-prevention coupling parts
- the coupling part 900 marked by D is a friction coupling part.
- the coupling part 900 marked by A is a firm locking coupling part which does not have the slot but has only the first holes 920 of FIG. 5 .
- the coupling parts 900 marked by B and C are buckling-prevention coupling parts which have slots 925 in the outer column 540 and are provided with first and second reinforcing plates 965 and 967 each having a low frictional coefficient, thus preventing buckling.
- the coupling part 900 marked by D is a friction coupling part which has a slot 925 in the outer column 540 and is provided with the first and second friction plates 1000 and 1010 each having a high frictional coefficient.
- the coupling part 900 marked by A is moved in the state where the outer column 540 and the inner column 520 are fixed.
- the first bolts 980 passing through the slots 925 of the outer column 540 move slightly downwards in the slots 925 .
- a very small amount of frictional energy is generated between the first and second reinforcing plates 965 and 967 which contact the outer circumferential surface of each slot 925 .
- the first bolts 980 passing through the slot 925 of the outer column 540 move downwards in the slot 925 .
- the movement of the first bolts 980 of the coupling part 900 , marked by D is the largest, because the coupling part 900 marked by D is the farthest from the fixed coupling part 900 marked by A.
- a large amount of frictional energy is generated between the first friction plate 1000 and the second friction plate 1010 , which are in close contact with the outer circumferential surface of the slot 925 , thus absorbing energy transmitted by the wind force 1020 .
- the energy generated by the wind force 1020 transmitted to the steel tower is attenuated by friction generated between the outer circumferential surface of the slot 925 of the outer column 540 of the coupling part 900 marked by D and the first and second friction plates 1000 and 1010 thereof.
- FIG. 7 is a detailed view showing a post of a steel tower, according to another embodiment of the present invention.
- the steel tower structure of the present invention includes an outer column 540 constituting each post 530 .
- the outer column 540 is arranged to be parallel to the inner column 520 , and has a division part 1100 which is divided at a predetermined position into two portions.
- the division part 1100 has on an upper portion thereof a slot 1200 , and third and fourth friction plates 1300 and 1350 which are provided to contact the front surface and the back surface of the slot 1200 , respectively.
- the division part 1100 has on a lower portion thereof seventh holes 1500 , and third and fourth reinforcing plates 1400 and 1450 which are provided to contact the outer circumferential surface of the seventh holes 1500 .
- first coupling plate 1460 is provided to contact the third friction plate 1300 and the third reinforcing plate 1400 .
- a second coupling plate 1470 is provided to contact the fourth friction plate 1350 and the fourth reinforcing plate 1450 .
- Third bolts 1600 sequentially pass through the first coupling plate 1460 , the third friction plate 1300 , the slot 1200 , the fourth friction plate 1350 , and the second coupling plate 1470 , and are fastened to third nuts 1700 .
- Fourth bolts 1650 sequentially pass through the first coupling plate 1460 , the third reinforcing plate 1400 , the seventh holes 1500 , the fourth reinforcing plate 1450 , and the second coupling plate 1470 , and are fastened to fourth nuts 1750 .
- the position of the upper structure and the lower structure of the division part 1100 may be changed.
- the horizontal section of the post 530 has a cross shape
- the horizontal section of each of the outer column 540 and the inner column 520 has an “L” shape.
- a plurality of coupling parts 901 , 902 , 903 , and 904 is provided to couple the outer column 540 to the inner column 520 using angle brackets and bolts.
- a slot 925 which is equal to the slot 925 of FIG. 5 is formed in the outer column 540 , to which each of the coupling parts 902 and 903 is coupled.
- FIGS. 8 a and 8 b are views showing the operation of the post of the steel tower of FIG. 7 .
- the coupling parts 901 and 904 are the locking coupling part, which is the same as the coupling part 900 marked by A in the first embodiment.
- the coupling parts 902 and 903 are the buckling-prevention coupling parts, which are the same as the coupling parts 900 marked by B or C in the first embodiment.
- the function of the friction coupling part which is marked by D in the first embodiment, is achieved by the upper structure of the division part 1100 .
- the present invention provides a friction type retrofitting device for steel tower structures, in which coupling parts are appropriately provided on posts of a steel tower, thus preventing the posts from buckling, and a slot and a friction plate are provided on the coupling parts, thus attenuating vibrations generated by wind force, therefore increasing the durability of the steel tower.
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Abstract
Disclosed herein is a friction type retrofitting device for steel tower structures. The retrofitting device includes a coupling part which couples an outer column and an inner column of a post of a steel tower to each other using an angle bracket and a bolt. A slot is formed in a portion of the outer column to which the coupling part is coupled. A friction plate is provided to contact an outer circumferential surface of the slot. Thereby, wind energy transmitted to the steel tower is attenuated by friction between the outer circumferential surface of the slot of the coupling part and the friction plate.
Description
- 1. Field of the Invention
- The present invention relates generally to a friction type retrofitting device for steel tower structures. More particularly, the present invention relates to a friction type retrofitting device for a steel tower, such as a power-transmission tower that transmits high voltage to a distant place, in which a slot and a friction plate are provided on a coupling part between columns constituting a post of the steel tower, thus attenuating vibrations generated by wind force acting on the steel tower.
- 2. Description of the Related Art
-
FIG. 1 is a front view showing a general steel tower,FIG. 2 is a side view showing the steel tower ofFIG. 1 , when wind acts on the front of the steel tower,FIG. 3 is a detailed view showing part of a post of the steel tower, andFIG. 4 is a view showing the structural change of the conventional post under the condition ofFIG. 2 . - As shown in
FIG. 1 , a general steel tower, especially a power-transmission tower 10 for transmitting high voltage, includes a frame 70 which is set up vertically,arms 20 which are horizontally provided on the upper portion of the frame 70,insulators 30 which hang downwards from ends of thearms 20, andelectric wires 40 which are connected to the lower ends of thecorresponding insulators 30. - The frame 70 includes four
vertical posts 50, andcross members 60 which are crossed between thevertical posts 50 to be coupled to thevertical posts 50. - As shown in
FIG. 2 , whenwind 80 blows in all directions, the power-transmission tower 10 is shaken. The part of the power-transmission tower 10 that is moved by thewind 80 is restored to its original position within a predetermined elastic range after thewind 80 dies down. - As shown in
FIG. 3 , eachpost 50 of the power-transmission tower 10 has a cruciform section. The cruciform section is formed by contacting edges of L-shaped columns columns columns inner column 52 faces the interior of the power-transmission tower 10, while theouter column 54 faces the exterior of the power-transmission tower 10 and has on predetermined portions thereofcoupling parts 90. - Each
coupling part 90 of the conventional power-transmission tower includesfirst holes 92 andsecond holes 93 which are formed in theinner column 52 and theouter column 54, respectively, anangle bracket 94 which has an “L”-shaped section and is provided withthird holes 96 andfourth holes 99,first bolts 98 which pass through thefirst holes 92 and thethird holes 96,second bolts 100 which pass through thesecond holes 93 and thefourth holes 99,first nuts 97 which are fastened to thefirst bolts 98,second nuts 102 which are fastened to thesecond bolts 100, andwashers 88 which are provided in front of thefirst nuts 97. - However, the
outer column 54 is provided at an outer position relative to theinner column 52. Thus, when the power-transmission tower 10 is moved by the wind, as shown inFIG. 4 , theouter column 54 provided at a position facing thewind 80 is extended further than theinner column 52. Theouter column 54 provided at the opposite side is compressed more than theinner column 52. - Thereby, the force applied to the power-
transmission tower 10 by the wind is transmitted to eachcoupling part 90 ofFIG. 3 , so that a large amount of energy acts on thesecond bolts 100, thesecond holes 93, and thefourth holes 99. Thus, the wind repeatedly acting on the power-transmission tower 10 greatly reduces the durability of thecoupling part 90. - Further, in the case where the interval between the
coupling parts 90 mounted to eachpost 50 is large, so that the length of the post is larger than the cross-section thereof, the post is apt to buckle, that is, bend suddenly, when the compressive load acting on both ends of the post reaches a predetermined level. - Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a steel tower structure, in which coupling parts are mounted to posts of a steel tower at proper intervals, thus preventing the posts from buckling, a slot is formed in a coupling part of an outer column, and a friction plate is coupled to the coupling part of the outer column, thus absorbing wind energy using friction energy, therefore enhancing durability.
- In order to accomplish the above object, the present invention provides a friction type retrofitting device for steel tower structures, including a coupling part coupling an outer column and an inner column of a post of a steel tower to each other using an angle bracket and a bolt, a slot formed in a portion of the outer column to which the coupling part is coupled, and a friction plate provided to contact an outer circumferential surface of the slot. In this case, wind energy transmitted to the steel tower is attenuated by friction between the slot and the friction plate of the coupling part.
- Further, a horizontal section of the post has a cross shape, and a horizontal section of each of the outer column and the inner column has an L shape. Further, a plurality of coupling parts having the slot in the outer column may be provided on the post, and the friction plate may be provided on one of the coupling parts. A reinforcing plate may be provided on a portion of the outer column to which the coupling part is coupled.
- The present invention provides a friction type retrofitting device for steel tower structures, including an outer column which is arranged to be parallel to an inner column, thus providing a post of a steel tower, and is divided at a predetermined position into two portions, a slot which is formed in one of the divided portions, and a friction plate which is provided to contact an outer circumferential surface of the slot. In this case, wind energy transmitted to the steel tower is attenuated by friction between the slot and the friction plate.
- Further, a horizontal section of the post has a cross shape, and a horizontal section of each of the outer column and the inner column has an L shape. Further, a plurality of coupling parts is provided to couple the outer column to the inner column using an angle bracket and a bolt, with a slot formed in a portion of the outer column to which the coupling part is coupled.
- The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a front view showing a general steel tower; -
FIG. 2 is a side view showing the steel tower ofFIG. 1 , when wind acts on the front of the steel tower; -
FIG. 3 is a detailed view showing part of a post of the steel tower; -
FIG. 4 is a view showing the structural change of the conventional post under the condition ofFIG. 2 ; -
FIG. 5 is a detailed view showing a post of a steel tower, according to an embodiment of the present invention; -
FIGS. 6 a and 6 b are views showing the operation of the post of the steel tower ofFIG. 5 ; -
FIG. 7 is a detailed view showing a post of a steel tower, according to another embodiment the present invention; and -
FIGS. 8 a and 8 b are views showing the operation of the post of the steel tower ofFIG. 7 . - Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Reference now should be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components. For clear description of the present invention, known constructions and functions will be omitted.
- The first embodiment of the present invention is as follows.
-
FIG. 5 is a detailed view showing a steel tower, according to an embodiment of the present invention. - A friction type retrofitting device for steel tower structures, according to the present invention, includes
coupling parts 900,slots 925, and friction plates 1000 (see portion D ofFIG. 5 ). Thecoupling parts 900 couple anouter column 540 and aninner column 520 of eachpost 530 of the steel tower to each other usingangle brackets 940 andbolts slot 925 is formed in a portion of theouter column 540 to which thecoupling part 900 is coupled. Thefriction plate 1000 is provided to contact the outer circumferential surface of thecorresponding slot 925. - Further, the horizontal section of each
post 530 has a cross shape, and the horizontal section of each of theouter column 540 and theinner column 520 has an L shape. - When the length of each
post 530 is larger than the sectional area, and compressive load applied to both ends of thepost 530 reaches a predetermined level, buckling may occur, that is, thepost 530 may suddenly bend. In order to prevent the buckling, a proper number ofcoupling parts 900 is provided in the longitudinal direction of eachpost 530. As shown inFIG. 5 , when fourcoupling parts 900 are provided on onepost 530, theupper coupling part 900, marked by A, hasfirst holes 920 which are formed in theouter column 540, andsecond holes 930 which are formed in theinner column 520. Twofirst reinforcing plates 965 are provided to contact thefirst holes 920 and thesecond holes 930. Anangle bracket 940 is provided to contact thefirst reinforcing plates 965. -
Third holes 960 andfourth holes 990 are formed in theangle bracket 940.Fifth holes 962 andsixth holes 992 are formed in the reinforcingplates 965. Theangle bracket 940 is provided to one side of theouter column 540, andfirst washers 880 andfirst nuts 970 are provided to the side opposite theangle bracket 940. Theangle bracket 940 is provided to one side of theinner column 520, andsecond washers 882 andsecond nuts 972 are provided to the side opposite theangle bracket 940. - The
coupling part 900 marked by A is provided withfirst bolts 980 which sequentially pass through thethird holes 960, thefifth holes 962, thefirst holes 920, and thefirst washers 880, and are fastened to thefirst nuts 970. Thecoupling part 900 marked by A is also provided withsecond bolts 982 which sequentially pass through thefourth holes 990, thesixth holes 992, thesecond holes 930, and thesecond washers 882, and are fastened to thesecond nuts 972. - The
coupling parts 900 that are marked by B and C and are provided at a middle position have the same structure as thecoupling part 900 marked by A except that theslot 925 is formed in theouter column 540 in place of thefirst holes 920, and a second reinforcingplate 967 is additionally provided in back of theslot 925. - Meanwhile, the
coupling part 900 marked by D and provided at a lower position has the same structure as thecoupling parts 900 marked by B and C, except that thefirst friction plate 1000 is provided between the front of theslot 925 and theangle bracket 940 in place of the first reinforcingplate 965, and asecond friction plate 1010 is provided between the back of theslot 925 and the second reinforcingplate 967. - Further, each of the first and second reinforcing
plates second friction plates - Thus, in brief, a plurality of
coupling parts 900 having theslots 925 in theouter column 540 is provided on eachpost 530. Thefriction plate 1000 is provided on one of thecoupling parts 900, and the reinforcingplate 965 is provided on theouter column 540 of thecoupling part 900. - The operation of the steel tower structure according to the first embodiment of the present invention, which is constructed as described above, will be described below.
-
FIGS. 6 a and 6 b are views showing the operation of the posts of the steel tower ofFIG. 5 . - In
FIG. 6 a, which shows part of the steel tower, thecoupling part 900 marked by A is a locking coupling part, thecoupling parts 900 marked by B and C are buckling-prevention coupling parts, and thecoupling part 900 marked by D is a friction coupling part. - That is, the
coupling part 900 marked by A is a firm locking coupling part which does not have the slot but has only thefirst holes 920 ofFIG. 5 . Thecoupling parts 900 marked by B and C are buckling-prevention coupling parts which haveslots 925 in theouter column 540 and are provided with first and second reinforcingplates coupling part 900 marked by D is a friction coupling part which has aslot 925 in theouter column 540 and is provided with the first andsecond friction plates - Thus, as shown in
FIG. 6 b, whenwind force 1020 acts on the steel tower, thecoupling part 900 marked by A is moved in the state where theouter column 540 and theinner column 520 are fixed. In thecoupling parts 900 marked by B and C, thefirst bolts 980 passing through theslots 925 of theouter column 540 move slightly downwards in theslots 925. At this time, a very small amount of frictional energy is generated between the first and second reinforcingplates slot 925. - Further, in the
coupling part 900 marked by D, thefirst bolts 980 passing through theslot 925 of theouter column 540 move downwards in theslot 925. The movement of thefirst bolts 980 of thecoupling part 900, marked by D, is the largest, because thecoupling part 900 marked by D is the farthest from the fixedcoupling part 900 marked by A. At this time, a large amount of frictional energy is generated between thefirst friction plate 1000 and thesecond friction plate 1010, which are in close contact with the outer circumferential surface of theslot 925, thus absorbing energy transmitted by thewind force 1020. - That is, the energy generated by the
wind force 1020 transmitted to the steel tower is attenuated by friction generated between the outer circumferential surface of theslot 925 of theouter column 540 of thecoupling part 900 marked by D and the first andsecond friction plates - The second embodiment of the present invention will be described below.
-
FIG. 7 is a detailed view showing a post of a steel tower, according to another embodiment of the present invention. - The steel tower structure of the present invention includes an
outer column 540 constituting eachpost 530. Theouter column 540 is arranged to be parallel to theinner column 520, and has adivision part 1100 which is divided at a predetermined position into two portions. - The
division part 1100 has on an upper portion thereof aslot 1200, and third andfourth friction plates slot 1200, respectively. - Further, the
division part 1100 has on a lower portion thereofseventh holes 1500, and third and fourth reinforcingplates seventh holes 1500. - Further, a
first coupling plate 1460 is provided to contact thethird friction plate 1300 and the third reinforcingplate 1400. Asecond coupling plate 1470 is provided to contact thefourth friction plate 1350 and the fourth reinforcingplate 1450. -
Third bolts 1600 sequentially pass through thefirst coupling plate 1460, thethird friction plate 1300, theslot 1200, thefourth friction plate 1350, and thesecond coupling plate 1470, and are fastened to third nuts 1700.Fourth bolts 1650 sequentially pass through thefirst coupling plate 1460, the third reinforcingplate 1400, theseventh holes 1500, the fourth reinforcingplate 1450, and thesecond coupling plate 1470, and are fastened to fourth nuts 1750. - The position of the upper structure and the lower structure of the
division part 1100 may be changed. - Meanwhile, the horizontal section of the
post 530 has a cross shape, and the horizontal section of each of theouter column 540 and theinner column 520 has an “L” shape. - Further, a plurality of
coupling parts outer column 540 to theinner column 520 using angle brackets and bolts. Aslot 925 which is equal to theslot 925 ofFIG. 5 is formed in theouter column 540, to which each of thecoupling parts - The operation of the steel tower structure according to the second embodiment of the present invention, which is constructed as described above, will be described below.
-
FIGS. 8 a and 8 b are views showing the operation of the post of the steel tower ofFIG. 7 . - Among the
coupling parts FIG. 8 a, thecoupling parts coupling part 900 marked by A in the first embodiment. Thecoupling parts coupling parts 900 marked by B or C in the first embodiment. - Further, the function of the friction coupling part, which is marked by D in the first embodiment, is achieved by the upper structure of the
division part 1100. - That is, as shown in
FIG. 8 b, whenwind force 1020 acts on the steel tower, theposts 530 are moved. Thus, the distance between thecoupling parts division part 1100 maintains a fixed state, while theslot 1200 of the upper portion of thedivision part 1100 moves upwards. At this time, a large amount of friction is generated between the outer circumferential surface of theslot 1200, thethird friction plate 1300, and thefourth friction plate 1350, thus attenuating energy transmitted by thewind force 1020. - Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. The present embodiments are therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within bounds of the claims, or equivalents of such bounds, are therefore intended to be covered by the claims.
- As described above, the present invention provides a friction type retrofitting device for steel tower structures, in which coupling parts are appropriately provided on posts of a steel tower, thus preventing the posts from buckling, and a slot and a friction plate are provided on the coupling parts, thus attenuating vibrations generated by wind force, therefore increasing the durability of the steel tower.
Claims (9)
1. A friction type retrofitting device for steel tower structures, comprising:
a coupling part coupling an outer column and an inner column of a post of a steel tower to each other using an angle bracket and a bolt;
a slot formed in a portion of the outer column to which the coupling part is coupled; and
a friction plate provided to contact an outer circumferential surface of the slot,
wherein wind energy transmitted to the steel tower is attenuated by friction between the outer circumferential surface of the slot and the friction plate of the coupling part.
2. The friction type retrofitting device as set forth in claim 1 , wherein a horizontal section of the post has a cross shape, and a horizontal section of each of the outer column and the inner column has an L shape.
3. The friction type retrofitting device as set forth in claim 1 wherein a plurality of coupling parts having the slot in the outer column is provided on the post, the friction plate being provided on one of the coupling parts.
4. The friction type retrofitting device as set forth in claim 2 wherein a plurality of coupling parts having the slot in the outer column is provided on the post, the friction plate being provided on one of the coupling parts.
5. The friction type retrofitting device as set forth in claim 3 , wherein a reinforcing plate is provided on a portion of the outer column to which the coupling part is coupled.
6. A friction type retrofitting device for steel tower structures, comprising:
an outer column arranged to be parallel to an inner column, thus providing a post of a steel tower, and divided at a predetermined position into two portions;
a slot formed in one of the divided portions; and
a friction plate provided to contact an outer circumferential surface of the slot,
wherein wind energy transmitted to the steel tower is attenuated by friction between the outer circumferential surface of the slot and the friction plate.
7. The friction type retrofitting device as set forth in claim 5 , wherein a horizontal section of the post has a cross shape, and a horizontal section of each of the outer column and the inner column has an L shape.
8. The friction type retrofitting device as set forth in claim 5 wherein a plurality of coupling parts is provided to couple the outer column to the inner column using an angle bracket and a bolt, with a slot formed in a portion of the outer column to which the coupling part is coupled.
9. The friction type retrofitting device as set forth in claim 6 wherein a plurality of coupling parts is provided to couple the outer column to the inner column using an angle bracket and a bolt, with a slot formed in a portion of the outer column to which the coupling part is coupled.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020060103283A KR100822595B1 (en) | 2006-10-24 | 2006-10-24 | Friction type retrofitting device for steel tower structures using relative displacement between a tower column and an added member |
KR10-2006-0103283 | 2006-10-24 | ||
KR10-2006-0103282 | 2006-10-24 | ||
KR1020060103282A KR100822594B1 (en) | 2006-10-24 | 2006-10-24 | Friction type retrofitting device for steel tower structures using relative displacement between members added to a tower column |
Publications (1)
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US20080092478A1 true US20080092478A1 (en) | 2008-04-24 |
Family
ID=39316563
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Application Number | Title | Priority Date | Filing Date |
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US11/636,158 Abandoned US20080092478A1 (en) | 2006-10-24 | 2006-12-08 | Friction type retrofitting device for steel tower structures |
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CN102312600A (en) * | 2011-04-07 | 2012-01-11 | 济南巨能铁塔制造有限公司 | Multi-prism plug-in type steel pipe pole of power transmission line |
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CN102322170A (en) * | 2011-06-08 | 2012-01-18 | 中国电力科学研究院 | Inserted plate connection assembly and power transmission line steel pipe tower |
CN104295146A (en) * | 2014-10-18 | 2015-01-21 | 福州万山电力咨询有限公司 | Compositional structure of angle tower for 110kV line engineering |
CN104763208A (en) * | 2015-04-09 | 2015-07-08 | 国家电网公司 | 110kV dual-loop novel butterfly-shaped penetrating and spanning tower in high-altitude area |
US20180355631A1 (en) * | 2015-06-09 | 2018-12-13 | Innogy Se | Lattice mast structure and method for increasing the stability of a lattice mast structure |
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