JP2987805B1 - Steel tower main pillar material - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To make welding unnecessary, to reduce the weight of a single member, and to facilitate transportation. SOLUTION: A steel plate cut to a required length is bent to form bent members 11 and 12 in which a joint J and a flange F are formed.
It is composed of an assembled Y-section steel material 1 formed by joining a pair with joining bolts and nuts 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tower main pillar used for a tower.

[0002]

2. Description of the Related Art Conventional power transmission towers, radio towers and the like use angle steel having a flange formed at right angles to a square tower frame as a main column member and a web member, and use a main column member as a joint. Angle steel tower connected with bolts of plates and connected to the main column, directly or through a gusset plate bolted to the main column, horizontal members, diagonal members, etc., as shown in FIG. A steel pipe is used for the main pillar P1 and the web material, and the main pillar P1 is connected by welding of a ribbed plate flange joint P2 or a forged flange joint P3.
A gusset plate P4 welded to the main pillar P1;
A pipe tower in which web members such as horizontal members P7 and diagonal members P8 are bolted through P5 and P6, or an X-shaped cross-sectional steel member in which equilateral angle steel is joined back to back is used as a main column material, and the main column material is jointed. X-section steel and steel pipes that are connected by bolting to the main column, directly or through a gusset plate bolted to the main column, using a steel tube to connect horizontal members, oblique members, etc. Are used in combination. FIG.
, P9 is a reinforcing ring, and P10 and P11 are abdominal material joining plates.

[0003] Angle towers are mainly used for machining small and medium-scale towers because they are mainly formed by cutting and drilling an equilateral angle steel and are excellent in manufacturability. Since the pipe tower uses steel pipes for both the main pillar and web material, the wind pressure decreases and the cross-section is better than the angle tower, so the tower weight has the advantage of decreasing compared to the angle tower, so it is large. It has been adopted in the mainstream of steel towers. For steel towers that use both X-section steel and steel pipes, each of the angle tower and the pipe tower holds the X-section steel with the equilateral angle iron joined back to back as the main pillar, the steel pipe as the abdominal material, By incorporating features, comprehensive economic effects can be obtained.

With regard to angle towers, for large-scale towers, the roll size of angle irons is limited, and when using high tension steel materials, the local buckling stress degree with respect to the width-to-thickness ratio of the flange must also be examined. Therefore, the use efficiency is reduced by limiting the width-to-thickness ratio of the flange, or by restricting the short column area slenderness ratio ([lambda]), and the use thereof is limited with the increase in weight, particularly for large towers.

[0005] Regarding the tower using both X-section steel and steel pipe, in the case of a large tower of a large-capacity power transmission line, firstly, the required strength is insufficient even if a commercially available angle section steel is X-section, and secondly. , The flange width required for attaching the web member of the X-section steel material is reduced to 50 to 75% of the flange width of the single angle steel with the same strength, and the web member size is increased due to the enlargement of the steel tower. And the increase in the number of mounting bolts increases the complexity of the joint between the web material and the main column material, which increases the number of processing steps. Third, since a commercially available angle steel is used for the main column material, the inclination of the main column material of the tower ( It is difficult to attach the web material to the main pillar flange directly at the place where the corrugation is large, and it is necessary to attach it through a bent plate, which increases the weight and the number of processing steps. Fourth, X-section steel members are usually joined at regular intervals. Spell welding is used, but distortion occurs due to high temperature at the time of galvanization, and a man-hour to correct this is added. Fifth, when an X-shaped cross section is formed using a commercially available angle iron, it is advantageous in terms of cross-sectional performance It is easy to select a small size with a large thickness, but when using high-tensile steel,
When the compressive strength of the member is determined in the short column area (the area with an elongation ratio of 100 or less), it is necessary to consider the local buckling strength, and the design efficiency may be reduced. Although it was possible to achieve economic effects with a steel tower of a class scale, the voltage was 500 KV and 1000 KV.
It is difficult to adopt it for large-scale transmission towers.

[0006] With regard to the steel tube tower, the weight and length of the steel tower production unit are limited because of the means of transporting the tower members to the site due to the enlargement of the tower, that is, the construction by the helicopter and the cableway for the construction in the mountainous area. The joint portion is significantly increased due to the restriction of the weight of the single member, thereby increasing the product weight increase rate and reducing the design efficiency. This phenomenon becomes more remarkable as the size of the large steel pipe increases, and countermeasures are expected. In addition, due to the increase in the size of the tower, the stress generated at the mounting contact between the arm and the main column, and the contact between the web and the main column is increased, and the allowable strength of fillet welding and allowable deformation of the hollow steel pipe for local deformation are increased. It is necessary to secure the proof stress, which makes the structure of the contact part more and more complicated.In addition, other mounting equipment such as step-down bolt installation and other lifting equipment, fall prevention equipment, assembly work, and overhead wire construction metal fittings are required. Today, there is a tendency that the man-hours required for steel tower manufacturing are significantly increased, and the original performance of the pipe is gradually deteriorated by the enlargement of the scale, and cost reduction is an urgent issue. The rise in man-hours is a major bottleneck.

[0007]

As described above, 500K is used.
A steel pipe tower used in a huge tower having a large capacity of V class or 1000 KV class has a problem that welding processing is indispensable, the number of reinforcing plates and joints is remarkably large, and transportation is difficult.

The present invention has been made for the purpose of solving such problems of the prior art.

[0009]

Means for solving the above-mentioned problems are shown in FIGS. 1 , 2, 3, 4, corresponding to one embodiment.
5 will be described below. According to the present invention, a steel plate cut to a required length is bent, and the angle between the pair of bending members 11 and 12 formed with a joint portion J and a flange portion F is 90 °.
KD Y Katachidan which is more formed on the bolt joint as above
The surface steel material 1 is connected to the joint plate 5 and the joint bolt nut 51.
Is a plurality of main pillars 2 connected to each other,
Stands up at an angle and has an angle to the vertical
Constructs a square tower and a flange of the adjacent main pillar 2
The part F is formed on the same plane,
4 can be directly bolted.

[0010] In the above-mentioned structure, welding is not required, the weight of the single member is reduced, and the transportation becomes easy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an assembly constituting the present invention.
It is sectional drawing which shows one Embodiment of Formula-Y shape section steel material . In FIG. 1, reference numeral 1 denotes an assembly type Y-section steel material. Assembling type Y
The section steel material 1 is obtained by bending a steel plate cut to the required length,
A pair of bent members 1 each having a joint J and a flange F formed thereon
1 and 12 are joined by joining bolts and nuts 13 (staggered arrangement; the same applies hereinafter). The bending members 11 and 12 are basically bent at 45 ° (θ1), and the included angle θ2 of the bending members 11 and 12 is 90 °. This takes into account a square tower with four square corners. Main pillars are erected at an angle to the vertical
To form a square tower with an inclination angle to the vertical
In this case, it is described later that the bending angle θ1 is adjusted so that the included angle θ2 of the two flange portions F is slightly changed so that the flange portions F of the adjacent main pillar members are made to be flush with each other, and the angle is set to 90 ° or more. I do. The assembling type Y-section steel material 1 is a bent member 1
1 and 12 are formed by assembling, so that the bending member 11,
12 and can be assembled on-site, which facilitates transportation. Further, the assembling type Y-section steel material 1 is assembled not by welding but by bolt bonding, so that assembling is easy. Furthermore, since the bending members 11 and 12 are formed by bending using steel plates, the assembled Y-section steel material 1 is different from the equilateral angle steel, which is a molded product, in the selection of the plate thickness and the main dimensions of the Y shape. Because there is freedom in the selection of
There is no limit to the application to large steel towers, and it is possible to manufacture steel materials of any cross section corresponding to the required strength, and it is excellent in economic effects. The assembled Y-section steel material 1 is used as a main pillar 2 as shown in FIG. In FIG. 2, 3 is a diagonal member, 4 is a horizontal member, 5 is a joint plate, and 6 is a diagonal member.

Since the assembling type Y-section steel material 1 is processed from a steel plate material, by changing the thickness t, the length La of the joint J and the length Lb of the flange F, the center of gravity (G) of the cross section is changed. ) The position Cy, the secondary moment of area with respect to the X to X axes and the Y to Y axes, the secondary sectional radius, the sectional area, and the like can effectively cope with the required strength without waste.

As shown in FIGS. 3 and 4, the main column member 2 is formed by connecting a plurality of assembled Y-section steel members 1 with a joint plate 5 and a joint bolt and nut 51. The joint plate 5 is in contact with both surfaces of the joint J and the flange F. Since the simplest joint plate 5 and the joint bolt and nut 51 are used for the joint of the assembly type Y-section steel material 1, there is no welding process such as mounting a forged flange joint in a steel pipe tower.

Since the main column 2 is divided into two parts, the bent members 11 and 12, even if the main column 2 becomes large in size, the weight of a single item carried by the conventional X-shaped steel Or, it is significantly reduced compared to a single part using steel pipe as the main pillar. For this reason, the length of the manufacturing member can be adopted up to the maximum length that can be transported without being limited to the weight of a single item, and the transportation operation by the truck and the helicopter becomes easy.

As shown in FIGS. 3 and 5, the diagonal member 3 and the horizontal member 4 are connected to the flange portion F with bolts and nuts.
As shown in FIG. 5, is connected to a plate 61 fixed to the flange portion F of the bending members 11 and 12 with bolts and nuts.

Since the prefabricated Y-section steel material 1 has a Y-section, its cross-sectional performance (such as the minimum turning radius required for the pressure-resistant material) is inferior to that of the steel pipe cross-section, but is superior to that of the equilateral angle steel. Further, unlike the steel pipe cross section, the flange portions F project in two perpendicular directions, so that it is easy to attach and fix the diagonal members 3 and the horizontal members 4 to the flange portions F, and to attach the abdominal members found in the steel pipe tower. No welding work such as gusset plate and reinforcing ring is required. Further, it is advantageous for the configuration of the members of the square tower, the weight is reduced while utilizing the features of the angle tower, and any member such as an angle or a steel pipe can be easily attached to the web member.

Generally, the width b of the upper portion of the main pillar 2 is smaller than the width B of the tower above the ground (this is referred to as a root opening), so that the main pillar 2 has an inclination angle with respect to the vertical. An increment L in the horizontal direction with respect to the vertical (height H) (= 0.5B-0.
The ratio L / H of 5b) is referred to as colobi. When the corobi becomes large, if the angle of 90 ° between the flanges is used as the main pillar, the surface connecting the flanges of the adjacent main pillars is not flat, so that the main pillar mounting portion or the mounting hardware of the belly material is usually used. Is bent so that it can be adhered to according to the corobi.
Since the assembling type Y-shaped section steel material 1 is formed by bending itself, it is possible to minutely change the included angle θ2 of both flange portions F by adjusting the bending angle θ1, and the adjacent main pillars The flange portion F of the material 2 can be coplanar.
Because of this, the belly of the diagonal member 3, the horizontal member 4, etc.
The members 3 and 4 can be directly bolted together .
No need to bend the main column material mounting portion or the gusset plate of No. 4 and the effect of reducing the working ratio of steel tower production can be expected.

[0018] The main pillars of the power transmission tower need to be equipped with a large number of stepping bolts for lifting and lowering, security equipment for fall prevention, and mounting brackets for assembling and overhead wire work. When the main column 2 is used for the prefabricated Y-section steel 1, the joints J are joined at regular intervals in accordance with the buckling shear stress with the joint bolts and nuts 13. Since this joint J protrudes in a diagonal direction of a plane connecting the main pillars 2, it is possible to use the joint bolt and nut 13 as an elevator bolt 14 as shown in FIG. 6. . For installation of other brackets,
Drilling can be performed as in the case of an equilateral angle iron, and welding can be omitted almost, which is advantageous in steel tower production.

In an angle tower, when a single main pillar has a uniform flange width, and a single main pillar having a different flange width is connected by bolting a joint plate, a step occurs. However, the assembling type Y-shaped steel member 1 has the bent members 11 and 1
Since No. 2 is formed by bending using a steel plate, there is a degree of freedom in the selection of the plate thickness and the selection of the main dimensions of the Y-shape, unlike the equilateral angle iron which is a molded product. Therefore, the length La of the joining portion J and the length La of the flange portion F of the assembled Y-section steel material 1 can be formed in a so-called tapered shape in which the length La is not uniform but increases at a constant rate from the upper end to the lower end. Accordingly, as shown on the left side of FIG. 7, the lengths of the joints and the flanges of the main pillars 2 are increased at the upper ends in accordance with the distribution of stress from the upper part of the main pillars 2 to the ground part according to the scale of the tower. It is also possible to adopt a so-called tapered main column material 2 which increases at a constant rate from the bottom to the lower end, so that the upper and lower connections of the main column material 2 have a shape without a step, and the transmission of stress becomes smooth, and the environment is beautified. Improvement is also measured. The right side of FIG. 7 shows a case where the assembled Y-section steel material 1 is not formed in a tapered shape.

The above is a basic form in which no lip is provided at the end of the flange portion F of the bending members 11 and 12.
As shown in FIG. 8, the inner lip 1 is attached to the end of the flange portion F.
5 or an outer lip 16 (indicated by a dotted line) may be provided. In the basic type without the lip, if the material of the steel (yield point strength, etc.) and the width-to-thickness ratio t / Lb (the ratio of the plate thickness to the length of the flange portion) of the flange portion F exceed a certain limit, the flange portion F Buckling strength may decrease. In such a case, by providing the lip, the plate element of the flange portion F is stiffened, and the local buckling strength of the flange portion F can be increased. The inner lip 15 and the outer lip 1
The choice of 6 is determined by the choice of tower size, structure, outer surface mounting of web material or inner surface mounting.

In the above description, only the inner lip 15 or the outer lip 16 is present at the flange portion F of the bending members 11 and 12, but as shown in FIG. The reinforcing member 17 having a flange width shorter than the length Lb of the flange portion F may be fixed by bolts and nuts 18 (in a staggered arrangement). The reinforcement member 17 is a chevron section steel material formed by bending a steel plate. When high tension steel is used for the above-mentioned basic shape and Y-shaped steel section with lip, depending on the thickness of the section and the width-thickness ratio determined by the length of the flange portion, the short column area (buckling length of the resistance member and member (A region close to the yield point stress determined by the ratio of the minimum radius of gyration) may be reduced due to the bending torsional buckling phenomenon. The reinforcing member 17 is a cross-section provided to increase the cross-sectional area and prevent a decrease in buckling strength due to the above-mentioned phenomenon. The reinforcing member 17 increases torsional rigidity and joint rigidity, and is applicable to a large-capacity large power transmission tower. is there.

As shown in FIG. 10, a similar effect can be obtained even if a commercially available equilateral angle steel 19 is used as the reinforcing member 17 in place of the angle-shaped cross-section steel material and fixed by bolts and nuts 20.

In the above description, the width of the flange of the angled section steel material 17 and the commercially available equilateral angled steel 19 is shorter than the length Lb of the flange portion F of the bent members 11 and 12, and the intersection of the flange portion F where the force acts and the center of gravity. G, but the width of the flange of the reinforcing member 21 is reduced as shown in FIG.
The reinforcing members 21 are fixed to the bending members 11 and 12 with bolts and nuts 22 (staggered arrangement) so that the reinforcing members 21 are longer than the length Lb of the flange portions F of the first and second flanges F. Reinforcing member 21 to which force acts when materials are connected
Is closer to the center of gravity G, and the sectional performance is further improved. As the reinforcing member 21, a chevron section steel material formed by bending a steel plate is used.

The selection of the reinforcing member from the angle steel section 17, the equilateral angle steel 19 on the market, and the reinforcing member 21 depends on the scale of the tower, the allowable strength required of the main column, the assembled Y-shape, and the like. It is determined by the length La of the joint J of the cross-sectional steel material 1, the length Lb of the flange portion F, the flange width of the reinforcing member, the cross-sectional performance determined by the correlation between the plate thickness, and the position of the center of gravity. This enables free selection of the most advantageous cross section in terms of the total cost of materials and production.

[0025]

EXAMPLE In the case of a huge steel tower of 500 KV class, the main column material was designed with an allowable strength of 570 tons required for the steel tower. In the case of a steel pipe steel tower, a steel pipe main pipe having an outer diameter of 555.8 mm and a thickness of 14 mm was used. When the column material (material STK-55) uses an assembling-type Y-section steel material, the length (La) 2 of the joint portion
An assembling Y-section steel material (material SS-55) with a lip having a length of 50 mm, a flange portion length (Lb) of 500 mm, a lip length (Lc) of 95 mm, and a thickness (t) of 16 mm can cope with this (FIG. 8). reference). Although the product weight is almost the same, in terms of the production cost, the assembling type Y-section steel material suffices to be 70% of the steel pipe main column material only with the main column material. Assuming that the weight of the main pillars occupies 40% of the entire pylon, the production cost of the entire pylon is 90% that of the steel pipe pylon using the assembled Y-section steel.

Designing the main column material for a 1000 KV class huge tower with an allowable strength of 1000 tons required for the tower, the outer diameter of the steel pipe tower is 762.0 m.
m, 18mm thick steel pipe main column material (material STK-55)
However, when an assembling Y-section steel material is used, the length of the joint portion (La) is 320 mm, and the length of the flange portion (Lb) is 640.
mm, lip length (Lc) 130 mm, thickness (t) 2
Assembled Y-section steel with 2mm lip (Material SS-5)
5) can respond to this. As for the product weight, the assembled Y-section steel material suffices to be 90% of the main column material of the steel pipe.
In terms of the production cost, the assembly type Y-section steel material suffices to be 60% of the steel pipe main column material only with the main column material. Assuming that the weight of the main pillars occupies 40% of the entire pylon, the pylon using the assembly type Y-section steel material suffices to be 85% of the steel pipe pylon when the total production value of the pylon is compared. In addition, the length of the steel pipe main column material is 4.6 m due to the limitation of the weight of a single item (2 tons).
In the assembling type Y-section steel material 1, basically, the bent member 11,
Since it is divided into 12, it is manufactured as a normal maximum length of 9.0 m without restriction on the weight of a single item. For this reason, in the assembling type Y-section steel material 1, the number of joints is halved and the assembling work is halved as compared with the steel pipe main column material.

At the time of shipment from the manufacturing factory, a plate or the like may be attached to the steel pipe main column material by welding in the case of a steel pipe main column material. It is not attached to the assembly type Y-section steel material 1. Therefore, for transportation and material accumulation of the assembled Y-section steel material 1, compact stacking is possible as in the case of equilateral angle steel. Therefore, in the assembling type Y-section steel material 1, the transportation efficiency by truck is improved, and the required area of the steel tower material storage space, the cableway and the helicopter transport base, and the steel tower assembly site scaffolding is substantially equivalent to the case where the steel pipe main column material is used. We can save.

[0028]

As described above, the present invention provides:
By bending a steel plate cut into required lengths, joints, more formed prefabricated Y-shaped cross section a bolt joint of a flange portion bent member pair of the pair of included angle formed as a 90 ° or more
Steel material is combined with the joint plate and the joint bolt and nut.
Number of main pillars connected to each other,
Square tower with an angle of inclination to the vertical
Constructed and the flanges of adjacent main pillars are flush with each other
And the belly material is directly bolted to the flange.
Is what you can do . Therefore, welding is not required, the weight of the single member is reduced, and transportation becomes easy. Therefore, according to the present invention, since the main column member is made of a prefabricated Y-shaped cross-section steel material, the number of bolts and the number of bolts required for forming the cross-section are increased,
On-site assembling as the main pillar material can be done by ground assembling, and the omission of welding process greatly contributes to the reduction of manufacturing costs, and reduces the total construction costs including tower manufacturing costs, on-site transportation and assembly work. The effect of obtaining is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a prefabricated Y-section steel material constituting the present invention.

FIGS. 2A and 2B are skeleton diagrams of the entire lower part of a power transmission tower generally used for a power transmission tower, where FIG. 2A is a front view and FIG. 2B is a view as viewed from YY of FIG.

FIG. 3 is an enlarged view of a portion X in FIG. 2 (A).

FIG. 4 is a sectional view taken along line II of FIG. 3;

FIG. 5 is a sectional view taken along line II-II of FIG.

FIG. 6 is a perspective view showing a mounting state of a lifting step bolt.

FIG. 7 is a front view showing another embodiment of the present invention.

FIG. 8 is a sectional view showing another embodiment of the present invention.

FIG. 9 is a sectional view showing another embodiment of the present invention.

FIG. 10 is a cross-sectional view showing another embodiment of the present invention.

FIG. 11 is a sectional view showing another embodiment of the present invention.

FIG. 12 is a detailed structural view of a steel pipe tower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Assembly type Y-section steel material 2 Main pillar material 3 Diagonal material 4 Horizontal material 5 Joint plate 11 Bending member 12 Bending member 13 Joint bolt nut

Claims (6)

(57) [Claims] 1. A bending a steel plate cut into required lengths, joints, the bending member pair of the pair of narrow angle and the flange portion formed are more formed in the bolt joint as 90 ° or more
Assembled Y-section steel is used for the joint plate and joint bolt
The main pillars are connected to each other by
Erected at an angle to the vertical
And a flange of the adjacent main pillar material
Part is formed on the same plane, and
Steel tower main pillar material that can be connected and bolted 2. The main column material of a steel tower according to claim 1, wherein the length of the joint portion and the flange portion of the pair of bending members are not uniform, but are formed in a tapered shape which increases at a constant rate from the upper end to the lower end. 3. The main column material of a steel tower according to claim 1, wherein a lip is provided inside an end portion of the pair of flange portions of the bending member. 4. The main column material according to claim 1, wherein a lip is provided outside an end of the pair of flanges of the bending member. 5. The main tower column according to claim 1, wherein a reinforcing member having a flange width shorter than the length of the flange portion of the bending member is bolted to the pair of flange portions. Lumber 6. The tower main column according to claim 1, wherein a reinforcing member having a flange width longer than the length of the flange portion of the bending member is bolted to the pair of flange members. Lumber