JP5891077B2 - Steel frame structure - Google Patents

Description

  The present invention relates to a steel frame structure applied to a power transmission tower or a radio tower.

  Conventional power transmission towers and radio towers include steel pipe towers that use steel pipes for the main pillar and abdomen, mountain steel towers that use angle steel for the main pillars and abdomen, and steel pipes for the main pillars. Is roughly divided into a PL steel tower using mountain steel for the abdomen.

  A steel pipe tower is applied to a large steel tower. As an advantage, since the wind pressure received by the steel pipe is smaller than that of the angle steel and the strength as a single material is excellent, the weight of the entire steel tower is small. However, there are drawbacks in that it is difficult to grasp the state of the inner surface of the steel pipe, the material unit price is high, and advanced welding technology is required for processing.

  The mountain steel tower is applied to small and medium-sized steel towers. As an advantage, the corrosion status can be grasped by visual inspection on an open section. In addition, the unit price of the material is low, and the processing is mainly easy cutting and drilling. As a disadvantage, the weight of the steel tower becomes larger than that of the steel pipe steel tower, and the construction cost increases due to an increase in the basic load.

  The PL steel tower has the characteristics of a steel pipe steel tower for the main pillar material. The belly has the characteristics of a mountain steel tower.

  Moreover, as a framework structure of these steel towers, a square steel tower and a rectangular steel tower are generally known. The square steel tower is designed so that the strength in the direction of the electric line is equal to the strength in the direction perpendicular to the electric line, and four surfaces have the same shape. The rectangular steel tower is designed so that the strength with respect to the direction of the electric wire and the strength in the direction perpendicular to the electric wire are different, and the two parallel surfaces have the same shape.

  Here, the framework structure of the PL steel tower will be described. The frame structure includes a leg portion, a main body portion, and an arm. The legs are framed to support the tower body and arms. The main body is framed so that the power transmission line installed on the arm can be supported at a predetermined height. The arm is framed so that three power transmission lines can be installed at a predetermined interval between a plurality of steel towers.

  And the frame of these parts is constituted by a main pillar material, a horizontal material, and a diagonal material (abdomen).

  Steel pipes are used as the main pillar material, and virtual contour lines embedded in the ground are supported at the four corners of the rectangular base body. A plurality of main column members having a predetermined length are connected in the axial direction so as to reach a predetermined height. The main column material is connected by joining the flange formed at the end of the lower main column and the flange formed at the end of the upper main column, and fastening both flanges with bolts and nuts. Is done.

  As the horizontal member, angle steel is used. Between the four main column members, the horizontal member is arranged in the horizontal direction with a predetermined interval in the axial direction of the main column member. It is connected to the column of books. Then, by connecting the main pillar material and the horizontal material, a plurality of quadrangular surfaces are formed when the steel tower is viewed from the plane, the left and right side surfaces, the front surface, and the rear surface.

  The diagonal material includes a first diagonal material and a second diagonal material. The first diagonal member is installed obliquely between the central part of the horizontal member located on the upper side and the central part of the main pillar member located on the left and right in the quadrangular construction surface. The first diagonal member is obliquely installed between the central portion of the horizontal member located on the lower side and the central portion of the main pillar member located on the left and right. The second diagonal member is obliquely installed at the four connecting portions of the main column member and the horizontal member and the central portion of the four first diagonal members. That is, a truss structure is formed by the horizontal material, the first diagonal material, and the second diagonal material on the four surfaces between the four main pillar materials. Then, the first diagonal member is assigned a large amount of force so that only a small force is applied to the horizontal member. In addition, the connection part of the center part of a horizontal material and a pair of 1st diagonal material is called the intersection of a surface.

  And in the existing steel tower comprised in this way, since a typhoon frequently attacks in recent years, wind-proof reinforcement is implemented. For example, a framework structure of a steel tower in which a main pillar material of an existing steel tower is reinforced is known (see Patent Document 1).

  The frame structure of the steel tower supports a pair of supporting members between the flanges at both ends of one main column member among the main column members connected in the axial direction. The support member includes a pair of angle steels and a connecting member. The pair of angle steels are arranged in a substantially T shape. Specifically, the other pieces extending in the same direction are arranged at a predetermined interval so that the respective one pieces extend in different directions.

  The pair of angle steels arranged in a substantially T shape is arranged along the axial direction of the main column material between the flanges at both ends of the main column material at symmetrical positions across the center of the main column material. Has been. The connecting members are respectively arranged at both ends of one main pillar, and a bolt for fastening the flange of the main pillar and the other end of the pair of angle steels arranged in a substantially T shape in the axial direction. It can be connected.

  And between the flanges of the both ends of one main pillar material is supported by a pair of support members, the compression or tensile strength of a main pillar material and a flange increases. In addition, since the center of gravity is held near the flanges at both ends of the main column member and the bolts that fasten the flanges by the pair of support members, no bending moment is generated with respect to the flanges and the bolts. That is, the main pillar material of the existing steel tower is reinforced.

JP 2005-282339 A

  However, in the case of the steel frame structure of Patent Document 1, the strength of the main pillar material is taken, but no strength measures are taken against the diagonal members arranged on the front, rear, left and right construction surfaces of the steel tower.

  Then, this invention makes it a subject to provide the frame structure of the steel tower which can fully ensure the intensity | strength with respect to the diagonal material arrange | positioned on the construction surface of a steel tower.

  The framework structure of the steel tower according to the present invention includes a first diagonal member disposed between main column members and a second diagonal member disposed between main column members so as to intersect the first diagonal member. The first diagonal member is composed of a first front diagonal member and a first back diagonal member arranged in parallel on the front and back sides, and the second diagonal member is The first front side at the intersection where the first diagonal member and the second diagonal member intersect each other, the second front diagonal member and the second rear diagonal member arranged in parallel on the front and back sides. One of the diagonal member and the second front diagonal member is divided into two and arranged in series on the same straight line, and the other is opposed to any one of the front diagonal members arranged in series. The other back side diagonal member is disposed in series between the end portions, and any one of the above Square of the back diagonal member member is characterized in that it is adapted to be through-placed.

  According to such a configuration, a large load applied to the diagonal member arranged in series can be stably dispersed by the diagonal member arranged in series by being divided into two. In addition, the diagonal member disposed through the end portions of the diagonal member arranged in series can sufficiently receive the load applied to the diagonal member disposed through. Moreover, since the diagonal member arranged in series and the diagonal member arranged through are arranged on the front and back, sufficient strength can be secured. Furthermore, since the front and back diagonal members arranged in series and the front and back diagonal members arranged in a crossing manner are arranged to cross each other, it is possible to ensure strength against vibration and vertical load in the steel tower.

  Further, angle steel is used for the first and second diagonal members, and since the cross section is an L shape and an open cross section, there is no internal corrosion. In addition, the equipment inspection of the first and second diagonal materials can be performed mainly by the appearance, and it is easy to grasp the equipment status. Further, high-level welding technology is not required for processing the first and second diagonal materials (simple processing is performed and defective products are reduced). Moreover, since the angle steel materials are used for the first and second diagonal members, the weight of the steel tower increases, but the material unit price can be reduced. Compared to the PL steel tower, the number of members and the wind receiving area are reduced, the steel tower weight and the basic load are reduced, and the contract cost can be reduced.

  Further, according to the present invention, any one of the front diagonal member and the back diagonal member and the remaining front diagonal member and the back diagonal member are made of chevron steel material, and one piece of each other. It is also possible to adopt a configuration in which the other pieces extending in the same direction are joined so that they extend in different directions.

  According to this configuration, one of the front side diagonal member and the back side diagonal member and the other front side diagonal member and the back side diagonal member extend in directions in which the respective pieces of the angle steel are different from each other. As shown, the other pieces of the angle steel that extend in the same direction are joined together. That is, since any one of the front side diagonal member and the back side diagonal member and the remaining other front side diagonal member and the back side diagonal member are joined in a T-shape, each other extending in different directions. The strength of the diagonal material is improved by one piece and the other piece joined in the same direction. In addition, any one of the front diagonal member and the back diagonal member and the remaining front diagonal member and the back diagonal member are joined in a T shape so that member corrosion due to rainwater retention is prevented. It can be prevented and has higher corrosion resistance than a steel pipe having a non-open cross section.

  Further, according to the present invention, a connecting plate is disposed at an intersecting portion where the first diagonal member and the second diagonal member intersect, and any one of the front diagonal members arranged in series on the connecting plate. And the other front diagonal member disposed through, the one back diagonal member disposed through, and the other back diagonal member arranged in series are connected to each other. May be.

  According to such a configuration, the front and back diagonal members arranged in series and the other diagonal members arranged front and back are connected on the front and back of the connecting plate, so that vibrations and loads related to the steel tower are connected to the connecting plate. Can be received with good balance on both sides of the connecting plate. In addition, since the diagonal members in the connecting plate are connected on the front and back of the connecting plate, more fastening members are used than when connecting the diagonal member to either the front or back side of the connecting plate. Thus, it is not necessary to connect them and the connecting plate can be made small. And since a connection board can be made small, it comes to be able to endure wind pressure by that much.

  Further, according to the present invention, the first front diagonal member is arranged in series on the front, rear, left and right entire surfaces formed between the main pillar members by the first diagonal member and the second diagonal member. In addition, the second front diagonal member is disposed through, the second back diagonal member is arranged in series, and the first back diagonal member is arranged through. May be.

  According to such a configuration, by making the frame structures of all the front, rear, left, and right structural surfaces the same, the strength of all the structural surfaces is made uniform, and the load and vibration can be received in a balanced manner.

  According to the present invention, the first front diagonal member is arranged in series on both the front and rear structural surfaces formed between the main column members by the first diagonal member and the second diagonal member. In addition, the second front diagonal member is disposed through, the second back diagonal member is arranged in series, and the first back diagonal member is configured to pass through, The first front diagonal member and the second front diagonal member are arranged in series on the left and right structural surfaces formed between the main column members by the first diagonal member and the second diagonal member. A material member may be arranged to penetrate, the second back side diagonal member may be arranged to penetrate, and the first back side diagonal member may be arranged in series.

  According to the present invention, the first front diagonal member divided into two is arranged in series on the same straight line, and the second front diagonal member is arranged between the opposing ends of the first front diagonal member arranged in series. The second back side diagonal member is arranged in series on the same straight line, and the first back side diagonal member is penetrated between the opposing ends of the second back side diagonal member arranged in series. Since it arrange | positions, sufficient intensity | strength can be ensured with respect to the vibration in a steel tower, and the load of a perpendicular direction.

The schematic perspective view which shows the framework structure of the steel tower which concerns on one Embodiment of this invention. The front view which shows the composition between the main pillar materials of FIG. (A) is a perspective view showing the intersection part of FIG. 2, (b) is a perspective view showing a connection part of the main pillar material, the horizontal member and the reinforcing material, and (c) is a perspective view of FIG. 3 (b). BB arrow sectional drawing. FIG. 3 is an exploded perspective view of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. Sectional drawing which shows the state which joined the front side diagonal member and the back side diagonal member in T shape. It is the schematic which shows the modification of the framework structure of the steel tower shown in FIG. 1, and is the schematic which shows the framework structure of a left-right construction surface.

  An embodiment of a steel frame structure according to the present invention will be described with reference to FIGS. FIG. 1 schematically shows a part of the frame structure of the steel tower, and for convenience, only the frame of the adjacent construction surface is illustrated. FIG. 2 is an enlarged view of a part of the frame structure in one plane, and it is assumed that this frame structure is formed in common on all the front, rear, left and right planes.

  As shown in FIGS. 1 and 2, the framework structure of the steel tower 1 according to the present embodiment includes a foundation surface 2, main pillar members 3,..., A first diagonal member 4, and a second diagonal member 5. The horizontal member 6, the reinforcing member 7, and the construction surfaces 8 a to 8 d are provided.

  As shown in FIG. 1, the base surface 2 is formed in a square shape in plan view on the ground on which the steel tower 1 is installed.

  As shown in FIG. 1, the main pillar material 3 is made of steel pipe material and is erected at four corners of the base surface 2. Specifically, it is supported by a foundation body (not shown) embedded in the foundation surface 2.

  As shown in FIG. 3A, FIG. 4 and FIG. 5, the first diagonal member 4 includes a first front diagonal member 40 and a first back diagonal member 41 arranged in parallel on the front and back sides. Has been. As shown in FIG. 6, the first front diagonal member 40 and the first back diagonal member 41 are made of angle steel and joined in a T-shape. Specifically, the other pieces 40b and 41b extending in the same direction are joined together and fastened by bolts B and nuts N so that the respective pieces 40a and 41a extend in different directions. By doing so, the strength in the length direction can be reinforced by the one piece 40a, 41a extending in a different direction and the other piece 40b, 41b extending in the same direction joined. Moreover, the vibration and load with respect to the steel tower 1 can be received in the stable state by joining a pair of angle steel materials to the front and back. Moreover, the first front-side diagonal member 40 and the first back-side diagonal member 41 are joined in a T-shape, so that member corrosion due to stagnation of rainwater can be prevented, compared to a steel pipe having a non-open cross section. High corrosion resistance.

  Further, as shown in FIG. 2, the first diagonal member 4 is disposed between the main column members 3 and 3 at a predetermined interval in the height direction of the main column member 3. Further, as shown in FIGS. 3A, 4 and 5, the first front diagonal member 40, 40 is divided into two parts at the intersection X where it intersects the second diagonal member 5. They are arranged in series on the line. As shown in FIGS. 3A, 4, and 5, the first back-side diagonal member 41 is divided into two and is disposed between the ends of the first front-side diagonal members 40, 40 facing each other. ing.

  As shown in FIGS. 3A, 4 and 5, the second diagonal member 5 is composed of a second front diagonal member 50 and a second rear diagonal member 51 arranged in parallel on the front and back sides. Has been. Similarly to the first diagonal member 4, the second front diagonal member 50 and the second back diagonal member 51 are made of angle steel and joined in a T-shape. Further, as shown in FIGS. 3A, 4, and 5, the second front diagonal member 50 is disposed between the main column members 3 and 3 so as to intersect the first front diagonal member 40. Is arranged. Further, the second front diagonal member 50 is divided into two parts and is disposed between the end portions of the second rear diagonal members 51, 51 facing each other. As shown in FIGS. 3A, 4, and 5, the second back side diagonal members 51, 51 are divided into two at the intersection X intersecting with the first diagonal 4 and are on the same straight line. They are arranged in series. In this case as well, the member corrosion due to the retention of rainwater can be prevented in the second front side diagonal member and the second back side diagonal member by joining in a T shape as described above.

  As shown in FIGS. 3A to 3C, 4, and 5, the horizontal member 6 includes a front-side horizontal member 60 and a back-side horizontal member 61 that are arranged in parallel on the front and back sides. One end of the front horizontal member 60 and the back horizontal member 61 is disposed on the main pillar member 3 between the first diagonal member 4 and the second diagonal member 5, and the other end thereof is the first diagonal member. At the intersection X where the material 4 and the second diagonal material 5 intersect, the first diagonal material 4 and the second diagonal material 5 are arranged in the left and right spaces of the connecting plate 10. Similarly to the first diagonal member 4, the horizontal member 6 (the front horizontal member 60 and the back horizontal member 61) is made of angle steel and joined in a T-shape. Further, the horizontal member 6 (the front side horizontal member 60 and the back side horizontal member 61) is divided into two at the intersecting portion X where the first diagonal member 4 and the second diagonal member 5 intersect and are arranged on the same straight line. Is arranged. That is, the horizontal member 6 (the front side horizontal member 60 and the back side horizontal member 61) extends in the horizontal direction from the main column members 3 and 3 on both sides to the intersection X of the first diagonal member 4 and the second diagonal member 5. It is erected (see FIG. 2).

  The reinforcing material 7 is made of angle steel. Further, as shown in FIGS. 2 and 3B, the reinforcing member 7 has a central portion of the first diagonal member 4 and a second diagonal member 5 from the connection portion Y between the column member 3 and the horizontal member 6. It is built in the center of each.

  As shown in FIG. 1, the structural surfaces 8 a to 8 d are formed between the main column members 3 and 3 (before and after the tower 1 by the first diagonal member 4, the second diagonal member 5, the horizontal member 6, and the reinforcing member 7. Left and right side). In all the structural surfaces 8a to 8d, the first diagonal member 4, the second diagonal member 5, the horizontal member 6 and the reinforcing member 7 are framed so as to form a truss structure having a triangle as a basic unit.

  Then, as shown in FIGS. 3 (a), 4 and 5, a connecting plate having a polygonal shape (hexagonal shape) is provided at the intersection X where the first diagonal member 4 and the second diagonal member 5 intersect. 10 is arranged. The connecting plate 10 has first front diagonal members 40, 40 arranged in series, a first rear diagonal member 41 penetrating, and a second front diagonal member penetratingly arranged on the front and back. The member 50 and the 2nd back side diagonal member 51,51 arrange | positioned in series are connected.

  As shown in FIG. 4, the first diagonal member 4, the second diagonal member 5, and the horizontal member 6 are formed with insertion holes H for bolts B at equal intervals along the axial direction. Further, the connecting plate 10 is formed with an insertion hole H for a bolt B for fastening and fixing the first diagonal member 4, the second diagonal member 5, and the horizontal member 6.

  This frame structure is configured in common on all front and rear structural surfaces 8a to 8d formed between the main column members 3 and 3. Therefore, the strength is made uniform on all the front, rear, left and right structural surfaces 8a to 8d, and vibrations and loads can be received in a balanced manner. And since the 1st diagonal member 4 and the 2nd diagonal member 5 are connected with the front and back of the connection board 10, the length of the connection part of the 1st diagonal member 4 and the 2nd diagonal member 5 is taken large. There is no need, and the connecting plate 10 can be made smaller by that amount and can withstand wind pressure.

  In addition, a connection plate 11 having a substantially rectangular shape is disposed at a connection portion Y between the horizontal member 6 and the reinforcing member 7. The connecting plate 11 is connected to the horizontal member 6 and the reinforcing member 7 (see FIGS. 2 and 3B).

  As described above, according to the above-described embodiment, the strength of the diagonal members 40 and 51 that are divided in two and arranged in series on the same straight line is reduced by the opposite ends of the diagonal members 40 and 51 arranged in series. Reinforcement can be reinforced by the diagonal members 41 and 50 penetrating between the sections. Furthermore, since the first diagonal members 40, 41 on the front and back sides and the second diagonal members 50, 51 on the front and back sides are arranged so as to intersect with each other, it is reinforced against vibrations in the tower 1 and loads in the vertical direction. can do.

  Moreover, since the angle steel material is used for the 1st and 2nd diagonal materials 4 and 5, since it becomes an open cross section, there is no internal corrosion. In addition, the equipment inspection of the first and second diagonal members 4 and 5 can be performed mainly by the appearance, and the equipment status can be easily grasped. Further, high-level welding technology is not required for processing the first and second diagonal members 4 and 5 (simple processing is performed and defective products are reduced). Moreover, since the angle steel material is used for the 1st and 2nd diagonal materials 4 and 5, although a steel tower weight becomes large, a material unit price can be reduced. Compared to the PL steel tower, the number of members and the wind receiving area are reduced, the steel tower weight and the basic load are reduced, and the contract cost can be reduced.

  In addition, this invention is not limited to the said embodiment, A various change can be made.

  For example, in the case of the above-described embodiment, the first front diagonal member 40, 40 is arranged in series and the first back diagonal member 41 is penetrated in all the front, rear, left, and right structural surfaces 8a to 8d. To. On the other hand, the second front diagonal member 50 is disposed through, and the second back diagonal members 51, 51 are arranged in series. However, as shown in FIG. 2, on the front and rear construction surfaces 8a and 8c, the first front diagonal member 40, 40 is arranged in series, and the first back diagonal member 41 is arranged to penetrate therethrough. The second front diagonal member 50 is disposed through the second diagonal member 51 and 51 in series. Then, as shown in FIG. 7, the first front diagonal member 40 and the first back diagonal member 41, 41 are arranged in series on the left and right construction surfaces 8 b, 8 d. To do. On the other hand, the second front diagonal member 50, 50 may be arranged in series, and the second back diagonal member 51 may be disposed through.

  DESCRIPTION OF SYMBOLS 1 ... Steel tower, 3 ... Main pillar material, 4 ... 1st diagonal material, 5 ... 2nd diagonal material, 8a-8d ... Construction surface, 10 ... Connection board, 40 ... 1st front side diagonal material member, 41 ... 1st back side diagonal member, 50 ... 2nd front side diagonal member, 51 ... 2nd back side diagonal member, S ... space, X ... crossing part

Claims (5)

A first diagonal disposed between the main pillars;
In a framework structure of a steel tower provided with a second diagonal member arranged between main pillar members so as to intersect the first diagonal member,
The first diagonal member includes a first front diagonal member and a first back diagonal member arranged in parallel on the front and back sides,
The second diagonal member is composed of a second front diagonal member and a second back diagonal member arranged in parallel on the front and back sides,
In the intersection where the first diagonal and the second diagonal intersect,
Either one of the first front diagonal member and the second front diagonal member is divided into two and arranged in series on the same straight line, and the other of the first front diagonal member is arranged in series. Between the opposing ends of the material member is arranged penetrating,
Furthermore, the frame structure of the steel tower is characterized in that the other back-side diagonal member is arranged in series and the one back-side diagonal member is arranged to penetrate therethrough.   The one front diagonal member and the back diagonal member and the remaining front diagonal member and the back diagonal member are made of chevron steel, and one piece extends in a different direction. The steel frame structure according to claim 1, wherein the other pieces extending in the same direction are joined to each other. A connecting plate is disposed at an intersection where the first diagonal member and the second diagonal member intersect;
To the connecting plate,
Any one of the front diagonal members arranged in series;
The other other front diagonal member arranged through,
One backside diagonal member disposed through,
The frame structure of a steel tower according to claim 1, wherein the other back-side diagonal member arranged in series is connected. In all the front and back, left and right structural surfaces formed between the main column members by the first diagonal member and the second diagonal member,
The first front diagonal member is disposed in series, and the second front diagonal member is disposed through,
4. The structure according to claim 1, wherein the second back side diagonal member is arranged in series and the first back side diagonal member is arranged to pass therethrough. 5. Steel tower frame structure. In both front and back surfaces formed between the main column members by the first diagonal member and the second diagonal member,
The first front diagonal member is disposed in series, and the second front diagonal member is disposed through,
While the second back side diagonal member is arranged in series and the first back side diagonal member is configured to pass through,
In the left and right structural surfaces formed between the main column members by the first diagonal member and the second diagonal member,
The second front diagonal member is disposed in series, and the first front diagonal member is disposed through,
4. The apparatus according to claim 1, wherein the second back side diagonal member is disposed to penetrate the first back side diagonal member, and the first back side diagonal member is arranged in series. 5. Steel tower frame structure.

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