JP2002004414A - Trussed girder structure and method of constructing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form of a trussed girder structure having high accuracy and being easy to assemble on site, while using continuous members for chord members in the direction of main stresses, without requiring a complex formation process for branch connections. SOLUTION: A trussed girder comprises an upper chord member, a lower chord member and diagonal members. A steel block 3 having a recessed surface 18 on its side facing a chord member 1, with the recessed surface 18 partially or entirely in contact with the outer periphery of the chord member 1 and secured thereto, is interposed between each chord member 1 and each diagonal member 2, the block having on it side opposite to the chord member 1a diagonal member connecting plane 21 or a spherical surface or a cylindrical surface which is perpendicular to the axis of the diagonal member 2. The chord members 1 are secured to the steel block 3 and the steel block 3 to the diagonal members 2 to construct the trussed girder structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truss beam structure used for a roof structure in the field of civil engineering and construction.

[0002]

2. Description of the Related Art A conventional three-dimensional truss structure used in civil engineering and construction includes a system truss structure shown in FIGS. 21 and 22 as a first conventional example, and a system truss structure shown in FIG. A simple truss system as shown in Fig. 1 has also been put to practical use. On the other hand, as a third conventional example, there is a welded truss structure shown in FIG. 24, and each uses a most efficient steel pipe section as a truss material. 21 and 22 show a roof frame example 16 in the system truss structure, in which the roof structure 10 is supported by the support structure 8, and FIG.
Is a plan view, FIG. 22B is an elevation view, and FIG. 22 is FIG.
FIG. 4 is an enlarged view of a portion (that is, a detailed view of a joint portion). In each of the drawings, a node 11 is interposed between a pipe-shaped constituent shaft member (that is, a chord member) 1 and a diagonal member 2, and the chord member 1 and the diagonal member 2 are passed through and fixed by bolts 5 or welding. This is a system truss with a three-dimensional framework. When joining with the through bolt 5, a washer 6 for rotating the bolt 5 from the outside, a spring 12 for delivering the through bolt 5, an end cone 7 for transmitting stress, and the like are used. In this system truss, all members such as the chord 1 and the diagonal 2 are joined via the node 11, and the member in the main stress direction is also divided for each contact.

FIGS. 23 (a) and 23 (b) show joints of a simple truss system, and FIG. 23 (a) is an elevation view,
(B) is a plan view. In the second conventional example, each end of the chord member 1 and the diagonal member 2 is flattened to be fixed by a through bolt 5, a holding member 6, and the like.

FIG. 24 shows an example of a roof frame 16a using a welded truss structure. FIG.
(B) is a side view, and (c) is an enlarged view of the (b) portion of FIG. In the third conventional example, the chord member 1 and the diagonal member 2 are joined by the branch joint welded joint 4 to form a flat or space truss beam, and the truss beams are arranged and bridged between the support structures 8 to bridge the roof structure 17. A welded steel tube beam structure, which forms the following, is also commonly used. In this welding truss structure, the chord 1 is continuous in the main stress direction, but each diagonal 2 and the chord 1 are in contact with each other in a complicated three-dimensional cross section called a branch joint welding joint 4, and when welding and assembling. Requires advanced cutting technology.

[0005]

However, in the system truss shown in FIGS. 21 and 22 among the conventional structures, it is possible to manufacture a high-precision member by machining, but in the main stress direction connecting the support structures, The chord material 1 is divided by the node 11 for each contact point, and a large number of joints for transmitting the main stress are required, and there is a problem that the material and processing costs increase. Similarly, the simple truss structure shown in FIG. 23 in which the ends of the steel pipe members are flattened and bolted at each contact point is also used. In the main stress direction connecting the support structures, the chord material 1 is divided at each contact point by a node, and There has been a problem that the bolt joint for transmitting the stress becomes excessively large and the span is limited.

On the other hand, in the welded steel pipe truss structure shown in FIG. 24 in which the chord member 1 and the diagonal member 2 are joined by the branch joint welding joint 4, the weight of the joint portion is reduced because the chord section is continuous in the main stress direction. Although it suffices to be light, since the branch joint welding joint 4 of the diagonal member 2 has a complicated three-dimensional shape, it takes a lot of processing time,
In addition, there is a problem that it is difficult to obtain accuracy due to welding distortion, and that it is bulky in transportation due to assembly at a factory.
An object of the present invention is to provide a truss beam structure in which a chord member in a main stress direction uses a continuous member, does not require complicated branch joint processing, and is highly accurate and easy to assemble on site. It is in.

[0007]

In order to solve the above-mentioned problems, the present invention is configured as follows. A first invention is a truss beam composed of upper and lower chords and diagonal members, and has a concave surface on the chord side between the chord members and diagonal members, and a part or all of the concave surface is the chord member. A steel block having a diagonal joining plane orthogonal to the diagonal axis or a spherical or cylindrical surface is interposed on the side opposite to the chord side and fixed to the outer periphery of the chord. And the steel block, and the steel block and the oblique material are fixed to each other.

According to a second aspect, in the truss beam structure according to the first aspect, a steel pipe or a square steel pipe is used for one or both of a chord member and a diagonal member.

According to a third aspect of the present invention, in the truss beam structure according to the first or second aspect, the steel block and the chord are in contact and fixed by a straight line parallel to the chord axis.

According to a fourth aspect of the present invention, in the truss beam structure according to the first to third aspects, the steel block and the chord are fixed by welding.

According to a fifth aspect, in the truss beam structure according to the first to third aspects, the steel block and the diagonal member are fixed to each other with bolts.

According to a sixth aspect of the present invention, in the truss beam structure according to the fifth aspect of the present invention, the diagonal member joining bolt is fastened by rotating an external washer.

[0013] The method of constructing a truss beam according to the seventh invention is as follows.
In the truss beam structure of any one of the inventions, the steel block and the chord are fixed at the factory using the diagonal material as a guide, and after fixing, the diagonal material is separated and transported, and assembled at the site. And

According to an eighth aspect of the present invention, in a truss beam composed of a plurality of upper and lower chords and diagonal members, a concave surface is provided on the chord side between the chord members and the diagonal members, and a part of the concave surface or The whole is in contact with the outer periphery of the chord material, and a steel block having a parallel plane for joining the chord material and diagonal material is interposed on the opposite side, and the chord material and the steel block, the steel block and the end are made flat. It is constituted by fixing each crushed diagonal material.

A ninth aspect of the present invention is a steel block according to the eighth aspect of the present invention, which is provided on a side opposite to a side in contact with the chord material, instead of a plane for joining the diagonal material parallel to the chord material. It has a flat surface for joining materials.

According to a tenth aspect, in the truss beam structure according to the eighth or ninth aspect, a steel pipe or a square steel pipe is used for a chord and a diagonal.

According to an eleventh aspect of the present invention, in the truss beam structure according to the eighth to tenth aspects, the steel block and the chord are in contact with and fixed to a straight line parallel to the chord axis.

According to a twelfth aspect, in the truss beam structure according to the eighth to eleventh aspects, the steel block and the chord are fixed by welding.

According to a thirteenth aspect, in the truss beam structure according to the eighth to twelfth aspects, the steel block and each diagonal member are fixed by bolts.

The method for constructing the truss beam of the fourteenth invention is described in the eighth to eighth aspects.
In the truss beam structure of the thirteenth invention, the connecting bolts of each diagonal member are previously installed in the steel block when fixing the steel block and the chord member, and each diagonal member whose end is crushed in a plane is attached. After that, they are integrated by tightening a nut from outside the steel block.

[0021]

According to the present invention, a steel block is provided between the upper and lower chord members and the diagonal members, the concave surface being in contact with the chord side surfaces, and the steel block having a joint surface with each diagonal member on the side opposite to the chord members. As a result, the diagonal member can avoid the branch joint as in the third conventional example, and can be a simple and accurate joining method of the system truss such as bolt connection, and the chord material is the first conventional example. Since no such nodes are used, it is possible to realize an efficient joint as a continuous material.

In the present invention, since the force acting between the steel block and the chord is only the shearing force in the axial direction of the chord, the joint between the steel block and the chord is made as described above. Only welding or bolting of both ends of the block may be sufficient. This welding or bolt joining is performed at the factory using a precision machined diagonal material as a guide, and after welding, each member can be disassembled and transported to the site, so welding truss that needs to be transported together The transportation efficiency is better than the beam structure.

Also, a joint surface between the upper and lower chord members and the diagonal member is formed between the upper and lower chord members and the diagonal member, and the end of the diagonal member is brought into contact with the joint surface and bolted, or If necessary, the joint surface with the diagonal material shall be a plane parallel to the chord material, or a plane parallel to the diagonal material, and the end of the flattened diagonal material shall be By jointly fixing them with through bolts and the like, it is possible to avoid branch joint joining of each diagonal material that requires a complicated welding groove, and at the same time, it is possible to realize an efficient and inexpensive joint portion where the chord material is a continuous material.

[0024]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1 to 3 show a truss beam structure according to the first embodiment. FIG. 1 (a) is an elevation view of a joint between a chord member and a diagonal member.
FIG. 2 (b) is a longitudinal side view of FIG. 2 (a), FIG. 2 (c) is a perspective view of a steel block, FIG. 2 is a cross-sectional view of a joint where a diagonal material and a chord material are separated, and FIG. FIG. 4 is a cross-sectional view of a joining portion in a state where a material and a chord material are joined.

As shown in the figures, the steel block 3 has a concave surface 18 and contact edges 20 at both ends on the outer periphery of the chord 1 and parallel to the chord axial direction. The surface has a joining plane 21 orthogonal to the axis of the oblique member 2 and a bolt hole 22 at the center of the joining plane 21 so that the ends of the oblique member 2 are joined to each other. The number of the joining planes 21 and the number of the bolt holes 22 are determined by the number of the diagonal members 2 joined to the steel block 3.
In the illustrated example, the steel block 3 has four joint planes 21 and bolt holes 22 to join the ends of four diagonal members 2 gathered from all sides. In the steel block 3, when the joint plane 21 is formed, the end of the diagonal member 2 is also a plane, and the steel block 3 and the diagonal member 2 are joined by surface contact between both joint planes (details will be described later). .

The steel block 3 may be manufactured by machining, or may be manufactured by casting or forging.

As shown in the drawing, the steel block 3 is arranged so that its concave surface 18 is stuck to the outer peripheral surface of the chord material 1 and both end contact edges 20 are arranged in parallel with the chord material axial direction. The edge 20 and the outer peripheral surface of the chord 1 are joined by welding 23. The welding of the chord material 1 and the steel block 3 is performed in a factory by temporarily joining the diagonal member 2 to the steel block 3 and adjusting the welding position.

After the welding is completed, the diagonal member 2 is separated from the steel block 3 and transported to the site in a state where the steel block 3 is welded to the chord member 1. In the field,
After assembling the string 1 in a predetermined arrangement, the diagonal 2 is joined to the steel block 3 previously welded to the string 1 by screwing or welding.

As shown in FIGS. 2 and 3, the connection of the diagonal member 2 to the steel block 3 by bolts is performed in the same manner as described with reference to FIG. That is, the end cone 7 is fixed to the end of the steel pipe diagonal member 2 by welding 29, and the bolt 5 protruding from the end of the end cone 7 is turned from the outside with the washer 6 fitted and locked to the bolt 5. This is performed by screwing into the bolt hole 22 of the steel block 3.

The joint surface of the steel block 3 with the diagonal member 2 may be a spherical surface or a cylindrical surface instead of the joint plane 21 perpendicular to the axis of the diagonal member 2. The joining end surface is also a spherical surface or a cylindrical surface. This joint surface
Since the diagonal member 2 and the steel block 3 can be always joined by a joint end portion having a common orthogonal plane because the members are processed in the direction of each member by machining or the like. Therefore, FIG.
As shown in the figure, the compressive force 13 transmitted from the diagonal member 2 to the steel block 3 is caused by the supporting force of the washer 6 and the tensile force 1
4 is transmitted to the chord 1 by the tensile force of the bolt 5, and the combined shearing force 15 is transmitted to the chord 1 by the welding portion 23.

FIGS. 4A and 4B show another embodiment. In the example shown in FIG. 1 as the first embodiment, the curvature of the concave surface 18 of the steel block 3 is almost the same as the curvature of the outer peripheral surface of the chord 1, and therefore, the concave surface 18 and the outer peripheral surface of the chord 1 Was almost completely in contact. On the other hand, in the example shown in FIG. 4A as another embodiment, the concave surface 18 of the steel block 3 is used.
Is greater than the curvature of the outer diameter of the chord, so that a gap 25 is formed between the concave surface 18 and the outer peripheral surface of the chord 1, and the steel block 3 Are joined to the outer peripheral surface of the chord material 1 only by the welding 23. Even in such a case, the shear force can be transmitted by the welding 23 at the contact edges 20 at both ends, and if the shear force and the eccentricity of the chord core are taken into consideration, the common steel block 3 can be used for chords having different diameters. Can be used.

FIG. 4 (b) shows an example of use in which a square steel pipe is used for the chord material 1, in which a steel block 3 is welded to the chord material 1 made of a square steel pipe. In this example, the corner 24 of the square steel pipe is
, And a gap 25 is formed on both sides of the corner 24. That is, both ends contact edge 2 of steel block 3
0 touches two flat surfaces that intersect at right angles of the square steel pipe,
By welding the contact edges 20 at both ends, the steel block 3
Are joined to a chord 1 made of a square steel pipe. Also in this example, if the contact edges 20 at both ends of the steel block 3 are in contact with the chord material 1 and are joined by welding 23 or the like, the force can be transmitted.

The cross-sectional shape of the chord 1 is not limited to a round steel pipe or a square steel pipe, but may be another deformed cross section.
Any structure may be used as long as the contact edges 20 at both ends of the steel block 3 contact in parallel with the main axis direction of the chord 1 and can be welded.

In FIG. 4B, one of the diagonal members 2
(Right side in the figure) is connected to the steel block 3 with the joining bolt 5 as in FIGS. 1 to 3. On the contrary,
The other diagonal member 2 (left side in the figure) is
The steel block 3 and the cylindrical cross section 26 formed on each of the diagonal members 2 are joined by welding,
Such a bonding example may be used.

FIGS. 5 and 6 show still another embodiment.
In the embodiment of FIGS. 3 and 4 described above, the steel block 3 is a welded joint of the contact edges 20 at both ends, whereas FIGS.
In the example, the steel block 3 is fixed to the string 1 by screwing a bolt 27 to the outer peripheral surface of the string 1 through the steel block 3 from the outside of the steel block 3. Other configurations are the same as the previous embodiment.

FIGS. 7A, 7B and 7C show still another embodiment. In this embodiment, the joint surface of the steel block 3 with the diagonal member 2 is a joint spherical surface 21a having a predetermined curvature (R) whose tangent is orthogonal to the axis of the diagonal member 2, and four joint spherical surfaces 21a are provided. An example of the steel block 3 in which the bolt holes 22 are opened and the diagonal members 2 are joined through the bolt holes 22 in the direction shown by the chain line in the direction of the axis (a).

FIGS. 8A, 8B and 8C show still another embodiment. In the example of FIG. 8A, a joining plane 21 for joining the diagonal member 2 to the steel block 3 fixed to the chord member 1 and a bolt hole 22 are formed in the circumferential direction of the chord member 1 having the cylindrical cross section. Fig. 1 shows an example in which one or a plurality are provided in a line and in the chord axial direction. The example of FIG. 8B shows an example in which a joint plane 21 and bolt holes 22 are arranged in the steel block 3 in three rows in the circumferential direction of the chord 1 having a cylindrical cross section. In the example of FIG. 8C, three steel blocks 3 in each of which the joining plane 21 and the bolt holes 22 are provided in two rows in the circumferential direction of the chord 1 surround the outer periphery of the chord 1 having a cylindrical cross section. An example is shown below.

FIGS. 9A, 9B, 9C and 9D show still another embodiment. The joining method of this embodiment is as follows.
The end 7 of the diagonal member 2 is crushed and bolted.
9A is an elevation view of a joint, FIG. 9B is a sectional view of the joint,
(C) is a plan view of a joint portion looking up, and (d) is a detailed view of a steel block. The steel block 3 has a concave surface 18 at the end to be in contact with the side surface of the chord 1, and by welding a contact edge 20 contacting the outer surface of the chord 1 on both end lines parallel to the axial direction of the chord 1. It is fixed to the string 1.

On the opposite side of the steel block 3, a plane 21b for connecting diagonal members and a bolt hole 2
Two. Each diagonal member 2 is flattened at its end 7 and bent so as to be in contact with the plane of the steel block 3. The end 7 is applied to the diagonal member joining plane 21b, and bolt holes are formed. By inserting the bolt 5 through 22
It is joined to the steel block 3 via the pressing member 6. When there is only one through bolt 5, the slant 2 can be fixed to the steel block 3 by frictional joining by freely rotating and assembling regardless of the angle of the slant 2 and tightening the through bolt 5. The compressive force 13 and the tensile force 14 transmitted from the diagonal member 2 to the steel block 3 are transmitted by the through bolt 5 and the pressing member 6, and the combined shear force 15 is applied to the contact edge 2.
It is transmitted to the chord material 1 by welding the zero part.

The steel block 3 may be manufactured by casting or forging, or may be manufactured by cutting a rolled material such as a channel-shaped cross section.

Further, the through bolts 5 can be inserted in advance when the steel block 3 is welded to the string 1 at the factory. In this case, each member is disassembled and transported, and after assembling at the construction site, after passing through the end bolt hole of the diagonal member 2 and the bolt 5, the holding member 6 and the nut are tightened to the bolt 5. The whole can be easily integrated.

FIG. 10 shows an application example of the above-mentioned joining method (FIG. 9). FIG. 10A shows an example in which a square steel pipe is used for the chord material 1.
(B) is an example in which an H section is used for the chord material 1. As described above, the string member 1 can have any cross-sectional shape in which the steel block 3 can be in contact with the two sides of the end, and the diagonal member 2 can also crush the end 7 in a plane. Any cross-sectional shape can be used.

FIG. 11 shows another application example of the joining method. FIGS. 11 (a) and 11 (b) show an example in which a plurality of bolts 5 are used to join the steel block 3 and the diagonal member 2 instead of one.
(A) is an elevation view, (b) is a plan view looking up. When the shear force transmitted from the slant member 2 to the chord member 1 is insufficient with one bolt, the number of bolts can be increased as necessary. 2C and 2D are examples in which the diagonal member 2 is separated and joined to the steel block 3, and FIG.
(D) is a plan view of looking up.

FIGS. 12 (a), 12 (b) and 12 (c) show still another embodiment of the joining method. In the joining method of this embodiment, the steel block 3 has a concave surface 18 that is in contact with the side surface of the chord 1 at an end portion, and is formed on the outer surface of the chord 1 on both ends parallel to the axial direction of the chord 1. It is fixed to the chord material 1 by welding the contact edges 20 that are in contact.

On the opposite side of the steel block 3, there is a flat surface 21c for connecting the diagonal members and a bolt hole 22 parallel to the diagonal members in the chord direction. The end 7 of each diagonal member 2 is flattened, and the flat part is applied to the steel block 3 so as to be in contact with the diagonal member joining plane 21c, and the bolt 5 is passed through the bolt hole 22. It is inserted, and the end of the diagonal member 2 is joined to the steel block 3 via the holding member 6.

When there is only one through bolt 5, the slant 2 is fixed to the steel block 3 by friction welding by freely rotating and assembling regardless of the angle of the slant 2, and tightening the through bolt 5. Can be. From diagonal 2 to steel block 3
The compression force 13 and the tension force 14 transmitted to the bolts 5 and the pressing members 6 are transmitted to the
Is transmitted to the chord 1 by welding the contact edge 20.

FIGS. 13, 14 and 15 show examples of application of the joining method shown in FIG. FIG. 13 shows that
In this example, a plurality of through bolts 5 can be used. FIG. 14 shows an example in which a square steel pipe is used for the chord 1, and FIG. 15 shows an example in which an H-shaped cross section is used for the chord 1. As described above, the string member 1 can have any cross-sectional shape in which the steel block 3 can be in contact with the two sides of the end, and the diagonal member 2 can also crush the end 7 in a plane. Any cross-sectional shape can be used.

Next, FIGS. 16 and 17 show an example in which a three-dimensional truss beam 28 having a triangular cross section is constructed by using the joining method shown in FIG. 1, 9 or 12, and the roof frame 16 is constructed. 16 is an overall perspective view, FIG. 17 (a) is an enlarged beam side view, FIG. 17 (b) is an AA sectional view in FIG. 17 (a), and FIG. 17 (c) is a deformation in AA section. It is a figure showing an example.

The space truss beam 28 has a V-shaped cross section as shown in FIG. 17 (b), and the tops can be connected by a purlin 9 which is orthogonal. Alternatively, as shown in FIG. The shape can be continued to form a folded plate structure. Further, the space truss beam according to the present invention is bent or provided with a gradient like the space truss beam 28 shown in FIGS. 18A to 18C and FIGS. 19A and 19B. And it is also possible to change the beam.

FIGS. 20 (a) and 20 (b) show another application example of the space truss beam structure according to the present invention. FIG. 20 (a) shows a dome roof 30 and FIG. Is Tower 3
It is one. The present invention can be applied to a three-dimensional truss structure other than such a beam, and in this case, the above-described operation and effect by connecting the chord member 1 and the diagonal member 2 with the steel block 3 can be effectively exhibited. Can be.

[0052]

According to the present invention, between the upper and lower chord members and the diagonal members in the truss beam structure, a concave surface which is in contact with the chord side surfaces on the entire surface or at the contact edges at both ends, and a joint with each diagonal member on the opposite side to the concave surface. A steel block with a suitable joint surface is interposed, so that the joint between the chord and the diagonal material avoids the branch joint joint as in the conventional example and the simple and accurate A good joining method can be achieved. In addition, the chord is continuous in the main stress direction without being divided in the axial direction unlike the conventional example, so that an efficient joint can be realized as a continuous material, and the number of materials and the processing cost of the truss beam structure are reduced. Reduction, ease of on-site assembly with high accuracy, high transport efficiency, etc. can be realized.

[Brief description of the drawings]

1A and 1B show a first embodiment of the present invention, wherein FIG. 1A is an elevational view of a joint between a chord member and a diagonal member, FIG. 1B is a vertical side view of FIG. 1A, and FIG. It is a perspective view of a block.

FIG. 2 is a cross-sectional view of a joint in a state where a diagonal member and a chord member of FIG. 1 are separated.

FIG. 3 is a cross-sectional view of a joining portion in a state where a diagonal member and a chord member of FIG. 1 are joined.

4 (a) and 4 (b) are longitudinal side views of two embodiments in which a gap is formed between a chord and a steel block.

FIG. 5 is a cross-sectional view of a joint portion in a state where a diagonal member and a string member are separated in an embodiment in which a joining member between a string member and a steel block is different from that in FIG. 2;

FIG. 6 is a cross-sectional view of a joint where a diagonal member and a string member are joined in an embodiment in which the joining means of the string member and the steel block is different from that of FIG. 2;

FIGS. 7 (a), (b), and (c) are a plan view, a side view, and a front view showing a steel block having a different configuration from the above, as another embodiment of the present invention.

FIGS. 8 (a), (b), and (c) are front views showing three examples of steel blocks having different configurations from the above, as still another embodiment of the present invention.

9 (a), 9 (b), 9 (c), and 9 (d) show still another embodiment of the present invention, and FIG.
(B) is a sectional view of the joint, (c) is a plan view of the joint as seen upward, and (d) is a detailed view of a steel block.

FIGS. 10 (a) and (b) are cross-sectional views showing a state where the oblique material and the chord material are joined in an embodiment in which the chord material is different from that of FIG. 9;

11 shows an embodiment in which the joining means between the chord material and the steel block is different from that of FIG. 9, (a) and (c) are elevational views,
(B), (d) is a plan view of looking up.

FIGS. 12A and 12B show another embodiment in which the joining means between the chord material and the steel block is different from the previous figures, wherein FIG. 12A is an elevation view of the joining part between the chord material and the oblique material, and FIG. FIG. 2A is a longitudinal side view, and FIG. 2C is a perspective view of a steel block.

13 is an elevational view of a joint between a chord member and a diagonal member, showing application example 1 of FIG. 12;

14 is a longitudinal sectional side view of a joint between a chord member and a diagonal member, showing application example 2 of FIG. 12;

15 is a longitudinal sectional side view of a joint between a chord member and a diagonal member, showing application example 3 of FIG. 12;

FIG. 16 is an overall perspective view of a roof frame constructed of a space truss beam having a triangular cross section using the joining method of FIG. 1;

17A is an enlarged elevational view of the beam in FIG. 9, FIG. 17B is a cross-sectional view taken along the line AA in FIG. 17A, and FIG. 17C is a cross-sectional view of a modification taken along the line AA in FIG. .

FIGS. 18 (a), (b) and (c) are side explanatory views showing three examples of a three-dimensional beam truss structure in which the present invention is implemented.

FIGS. 19 (a) and (b) are explanatory side views showing two other examples of the three-dimensional beam truss structure in which the present invention is implemented.

FIGS. 20 (a) and (b) are explanatory perspective views showing a dome roof and a tower as another application example of the three-dimensional beam truss structure according to the present invention.

FIGS. 21A and 21B are a plan view and a side view of a roof frame in the system truss structure of the first conventional example.

FIG. 22 is an enlarged view of a part (a) of FIG. 21 (that is, a detailed view of a node junction part).

FIGS. 23 (a) and 23 (b) are enlarged views of a joint in the simple truss system of the second conventional example, (a) is an elevation view, and (b) is a plan view.

24 (a) is an elevation view of a roof frame in a third conventional welding truss structure, FIG. 24 (b) is a side view, and FIG. 24 (c) is an enlarged view of a portion (b) of FIG. FIG. 3 is a detailed view of a branch joint welded joint).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 String material 2 Diagonal material 3 Steel block 4 Welding joint 5 Joining bolt 6 Washer, holding material 7 End cone, end 8 Support structure 9 Purlin 10 Roof structure 11 Node 12 Bolt delivery spring 13 Compression force from diagonal material 14 Tensile force from diagonal material 15 Shear force 16 Roof frame example 17 Roof structure 18 Concave surface 20 Both-end contact edge 21 Flat surface 21a Joint spherical surface 21b Joint surface 21c Joint surface 22 Bolt hole 23 Weld 24 Corner 24 25 Gap 26 Cylindrical joint 27 Bolt 28 space truss beam 29 welding

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kentaro Nakai 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Inventor Masanori Fujita 2-6-3, Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Inventor Yoshiyoshi Kamiyama 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Inventor Hiroshi Inuki 2-6, Otemachi, Chiyoda-ku, Tokyo 3 Nippon Steel Corporation (72) Inventor Kazuhiro Nagata 135 Naganuma-cho, Inage-ku, Chiba City Tokyo Ekon Corporation Iron Corporation F-term (reference) 2E125 AA15 AA35 AB01 AB15 AC15 AC16 AG14 AG16 AG41 AG58 AG59 BB09 BB16 BB31 BB32 BB33 BC06 BC07 BC08 BD01 BE02 CA03 CA15 2E163 FA12 FB32 FB45 FB49

Claims (14)

[Claims] 1. A truss beam composed of upper and lower chords and diagonal members, wherein the truss member has a concave surface on the chord side between the chord members and the diagonal members, and a part or all of the concave surface is formed of the chord members. A steel block having a diagonal joining plane orthogonal to the axis of the diagonal, or a spherical or cylindrical surface is interposed on the side opposite to the chord and fixed to the outer periphery. A truss beam structure composed of a steel block and a steel block and a diagonal member fixed to each other. 2. The truss beam structure according to claim 1, wherein in the truss beam structure, a steel pipe or a square steel pipe is used for one or both of a chord member and a diagonal member. 3. The truss beam structure according to claim 1, wherein in the truss beam structure, the steel block and the chord member are in contact with and fixed by a straight line parallel to the chord axis. 4. The truss beam structure according to claim 1, wherein in the truss beam structure, the steel block and the chord are fixed by welding. 5. The truss beam structure according to claim 1, wherein in the truss beam structure, the steel block and the diagonal member are fixed by bolts. 6. The truss beam structure according to claim 5, wherein in the truss beam structure, bolts for joining diagonal members are fastened by rotating an external washer. 7. The truss beam structure according to any one of claims 1 to 6, wherein the steel block and the chord material are fixed at a factory using the diagonal material as a guide, and after the fixing, the diagonal material is separated. A truss beam construction method characterized in that it is transported and assembled on site. 8. A truss beam composed of a plurality of upper and lower chord members and diagonal members, wherein the chord member and the diagonal member have a concave surface on the chord material side, and a part or all of the concave surface is the string. A steel block that is in contact with the outer periphery of the lumber and has a flat plane for joining diagonal members parallel to the chord members on the opposite side is interposed. A truss beam structure constructed by fixing materials. 9. A truss beam composed of a plurality of upper and lower chord members and diagonal members, wherein the chord member and the diagonal members have a concave surface on the chord material side, and a part or all of the concave surface is the string. A steel block that is in contact with the outer periphery of the timber and has a plane for joining diagonal members parallel to the diagonal members on the opposite side, and the chord members and the steel blocks, and the steel blocks and the ends that flatten the ends are flattened. A truss beam structure constructed by fixing materials. 10. The truss beam structure according to claim 8, wherein the truss beam structure uses a steel pipe or a square steel pipe for a chord member and a diagonal member. 11. The truss beam structure according to claim 8, wherein in the truss beam structure, the steel block and the chord member are in contact with and fixed to each other in a straight line parallel to the chord axis. 12. In the truss beam structure, the steel block and the chord are fixed by welding.
A truss beam structure according to any one of the above. 13. In the truss beam structure, the steel block and each diagonal member are fixed by bolts.
13. The truss beam structure according to any one of 12 above. 14. The truss beam structure according to any one of claims 8 to 13, wherein the connecting bolts of each diagonal member are previously installed in the steel block when the steel block and the chord member are fixed. A method of constructing a truss beam, wherein each diagonal member having a flattened end is attached and then integrated by tightening a nut from outside the steel block.