JP2006348734A - Truss structure for construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a truss structure for construction for inexpensively constructing a truss for construction having a beautiful joining part, by joining end surfaces of a truss member by welding in a mutually butted state, even when using a pipe material as the truss member. <P>SOLUTION: This truss structure for construction is constituted by joining at least three truss members 1a and 3. One end part of at least two truss members 3 is joined by welding in a state of mutually butting the respective end surfaces, and the other end part is joined to the other truss member 1a by a bolt 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a building truss structure in which at least three truss members are joined.

In such a building truss structure, it is necessary to join one end portions of two truss members out of at least three truss members, and increase the strength of buckling strength at the joint portion. Considering, joining by welding is more advantageous than bolt joining.
However, pipe material is often used as the truss member, and it has been conventionally considered difficult to weld the end surfaces of one end of the pipe material together. That is, in order to weld one end portions of the pipe material to each other, it is necessary to cut the end surface of the pipe material with a three-dimensionally complicated shape and angle. However, as an actual problem, it is very difficult to cut the end face of the pipe material with a complicated shape and angle as desired, and conventionally, an alternative means to replace the butt welding of the pipe material has been adopted.

For example, conventionally, using a hollow joint member in which two plate-like members having a circular plan view and a semi-elliptical front view are welded on top of each other, one end of a pipe member is welded to the joint member, That is, an alternative means is known in which a special joint member is used and pipe members are joined by welding via the joint member (see, for example, Patent Document 1).
In addition, a special holding member that has a slit-shaped insertion window or insertion notch around it is used, and the end of the pipe material is crushed into a flat plate portion. The flat plate portion is held from the insertion window or the insertion cut-out. An alternative means for joining the flat plate portions of the pipe material by electroslag welding in a state of being inserted into the pipe is also known (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 6-200562 JP 2001-173090 A

However, any of the above-described conventional techniques has various problems because the end faces of the pipe material are not directly welded.
For example, in the prior art disclosed in Patent Document 1, a special joint member is required, and the weld length is increased due to the intervention of the joint member. Is exposed, so that there is a disadvantage that the appearance is inferior.
Moreover, in the prior art disclosed in Patent Document 2, in addition to requiring a special holding member, it is necessary to crush the end portion of the pipe material into a flat plate portion. Furthermore, welding is also performed by electroslag welding. Since it is limited to such a special thing, there exists a fault that cost becomes high and it is inferior also in an external appearance.

  The present invention has been completed by paying attention to such conventional problems and high performance of machine tools in recent years, and its purpose is to achieve the end face of the truss member even when a pipe material is used as the truss member. It is possible to provide a building truss structure that can be constructed at low cost by making it possible to join together by welding in a state where they are brought together.

  A first characteristic configuration of the present invention is an architectural truss structure in which at least three truss members are joined, and one end of at least two truss members abut each other end surface. In the state, it is joined by welding, and the other end is joined to another truss member by a bolt.

According to the first characteristic configuration of the present invention, in the building truss structure composed of at least three truss members, one end of at least two truss members is welded in a state where the end surfaces are brought into contact with each other. Since the other end is joined to the other truss member with a bolt, the end face of at least one of the two truss members can be effectively utilized by utilizing the flexibility in the bolt joining portion. It is possible to weld the two pieces together.
That is, even when a pipe material is used as a truss member, for example, the end face shape of a pipe material having a complicated shape or angle is drawn as desired by using a rapidly developing three-dimensional CAD in recent years. In addition, by using a high-performance 3D laser processing machine and cutting the pipe material based on its end face shape, it becomes possible to lap welding the pipe materials, which has been considered difficult in the past, to some extent. . And in this invention, since the joining of pipe materials is made into only one end part, and the other end part employ | adopts the structure joined with a flexible bolt, the versatility in the bolt joint part is utilized effectively. By doing so, welding distortion caused by welding and cutting errors caused by a processing machine can be absorbed, so that one end portion can be welded beautifully.
As a result, when various types of steel such as pipe materials are used as truss members, a beautiful construction truss with a welded portion can be made inexpensively without requiring special joint members and holding members as in the past. It becomes possible to construct.

  A second characteristic configuration of the present invention is that a truss for roof is configured by joining a truss composed of at least three truss members as one unit truss and joining a number of the unit trusses.

  According to the second characteristic configuration of the present invention, a truss composed of at least three truss members is used as one unit truss, and many of the unit trusses are joined to form a roof truss. Then, it became possible to construct a roof truss that has many welded parts that can be reduced in cost compared to the prior art, so that the overall cost of the roof truss can be greatly reduced, and the roof with a beautiful welded part is also possible. Truss can be built.

  A third characteristic configuration of the present invention is that a welded portion at one end of the at least two truss members is disposed below the roof truss.

  According to the third characteristic configuration of the present invention, since the welded portion at one end of at least two truss members is disposed below the roof truss, the roof truss is easily visible. A beautiful butt-welded part will be placed on the roof, which can greatly increase the commercial value of the roof truss.

  A fourth characteristic configuration of the present invention is that the at least two truss members are pipe members.

  According to the fourth characteristic configuration of the present invention, since at least two truss members are pipe materials, they have a cross-sectional performance in the same direction as compared with steel molds and the like. Trusses can be built.

An embodiment of a building truss structure according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, this building truss structure is for constructing, for example, a roof truss RT for various buildings, and the roof truss RT is an upper chord material frame 1 positioned above and below. The lower chord member 2 is positioned, and the pipe member 3 as a truss member for connecting the upper chord member frame 1 and the lower chord member 2 to each other.
The upper chord member frame 1 is constructed by assembling a rectangular H-shaped steel 1a as a truss member and joining it by bolting or welding, and if necessary, a reinforcing bar 1b is also joined by bolting or welding. 2 is a rectangular pipe material having a rectangular cross-sectional shape, and the pipe material 3 is a circular pipe material having a circular cross-sectional shape.

At least three truss members out of the H-shaped steel 1a and the pipe material 3 as the truss members, in this embodiment, the H-shaped steel 1a assembled in the shape of a "field" in plan view, and 6 arranged diagonally A truss composed of a pipe material 3 and a single pipe material 3 arranged in the vertical direction is used as one unit truss T, and many of the unit trusses T are joined, or the unit truss T and a plane truss ( The roof truss RT is configured by joining every other (not shown).
In each unit truss T, a total of seven pipe members 3 including six pipe members 3 arranged obliquely and one pipe member 3 arranged in the vertical direction are arranged such that the lower ends of the pipe members 3 are mutually connected. In a state of being brought together, the lower chord member 2 is also put in a state of being brought together, and each lower end portion is joined by welding and also joined to the lower chord member 2 by welding.

In such a unit truss T, the lower ends of a total of seven pipe members 3 are joined together by butt welding, whereas the upper ends of each pipe member 3 are H-shaped steels that are other truss members. It is bolted to 1a. That is, as shown in detail in FIG. 7, a slit 4 is provided at the upper end of each pipe member 3, and a plate member 5 is inserted into the slit 4 and welded, while a plate member 6 is welded to the H-shaped steel 1a. In addition, a plurality of bolt holes 5a are formed in the plate material 5 on the pipe material side, and a plurality of bolt holes 6a are also formed in the plate material 6 on the H-shaped steel side.
Then, in a state where the two plate members 5 and 6 are put together, a pair of auxiliary plate members 7 extending between the two plate members 5 and 6 are arranged on both sides of the two plate members 5 and 6, and bolt holes 7 a drilled in both auxiliary plate members 7 and Bolts 8 are respectively inserted through the bolt holes 5 a of the plate material 5, the bolt holes 7 a of both the attached plates 7, and the bolt holes 6 a of the plate material 6, and are fastened by nuts 9 to be bolted.
Each bolt hole 5a, 6a, 7a has a relatively large diameter or a long hole with respect to the diameter of the bolt 8.

The lower end portion of the total seven pipe members 3 described above has a relatively complicated shape and angle for butt welding, but by using a three-dimensional CAD, the end face shape is set as desired. It is possible to draw, and by using a 3D laser processing machine, the lower end portion of each pipe member 3 can be easily cut along the shape of the end face. Furthermore, a special assembling jig J is used to assemble the unit truss T with the pipe material 3 and the H-shaped steel 1a.
As shown in FIG. 5, the assembling jig J includes six support portions 11 that can freely support six pipe members 3 arranged obliquely out of a total of seven pipe members 3 at a predetermined angle. As shown in FIG. 4, the jig body 10 is placed on a carriage 13 via an elevating device 12 configured to be movable up and down by a cylinder or the like not shown. Has been. A total of four wheels 14 are attached below the carriage 13 and placed on a pair of rails 15, and the carriage 13 is configured to be movable along the rails 15 in the lateral direction.

Next, a procedure for assembling the unit truss T using the assembling jig J will be described with reference to FIGS.
First, as shown in FIG. 2, the H-shaped steel 1a and the bar 1b are assembled and welded, the upper chord material frame 1 having a predetermined shape is grounded, and the lower chord material 2 is placed on the lower chord material frame 17, As shown in FIG. 3, the upper chord material frame 1 is placed on the upper chord material frame 16, and the assembly jig J is installed below the lower chord material 2 as shown in FIG. 4.
Thereafter, the ascending / descending device 12 of the assembling jig J is once lowered, the plate material 6 previously attached to the H-shaped steel 1a, the plate material 5 attached to the upper end portion of each pipe material 3, the accessory plate material 7, the bolt 8 and the nut 9 Are used to loosely temporarily fix the upper ends of the seven pipe members 3 to the H-shaped steel 1a of the upper chord member frame 1, and the six pipe members 3 and the lower chord member 2 that are arranged obliquely are shown in FIG. 5 (a) and 5 (b), the support unit 11 of the jig body 10 is supported.

In that state, the end surfaces of the lower end portions of the pipe members 3 are not necessarily in a state in which butt welding is possible, but rather in a state in which butt welding is impossible.
Therefore, the jig body 10 is moved up and down about 2 to 3 times by the lifting device 12. Since the upper end of each pipe member 3 is only loosely temporarily fixed to the H-shaped steel 1a during the vertical movement, each pipe member 3 is in a state in which the posture can be freely adjusted, and the jig body 10 is also moved by the carriage 13. The total of seven pipe members 3, particularly the six pipe members 3 arranged obliquely, as shown in FIG. 5B, are supported by the support portion of the jig body 10. 11 is adjusted so that the end faces of the pipe members 3 can be butt-welded.
Thereafter, if necessary, the pipe material 3 is temporarily fixed also to the adjacent upper chord material frame 1, and the end faces of the pipe materials 3 are butt-welded for the pipe material 3 adjusted so as to be able to mate. At the same time, the bolts 8 and the nuts 9 are firmly tightened, and the upper ends of the pipe members 3 are fixed to the H-shaped steel 1a and assembled into the unit truss T shown in FIG.

[Another embodiment]
(1) In the previous embodiment, an example in which a large number of unit trusses T are joined to form a roof truss RT has been described. However, the object of the present invention is not limited to the roof truss RT, and various types of architectures are used. The present invention can also be applied to a truss for use, and is not limited to a structure in which a plurality of unit trusses T are joined to each other, and can be applied to, for example, a single truss structure.
Further, in the case of a single truss structure, it can be constituted by at least three truss members. Therefore, the present invention can be applied to a building truss structure constituted by three or more truss members.

(2) In the previous embodiment, the H-shaped steel 1a was shown as the truss member constituting the upper chord member frame 1, and the round pipe member 3 was shown as the truss member connecting the upper chord member frame 1 and the lower chord member 2. As the truss member, it is possible to implement various shapes of steel, square pipe, etc., including H-shaped steel and round pipe.

Perspective view of the building truss structure viewed from below Perspective view showing assembly process of building truss structure Perspective view showing assembly process of building truss structure Side view showing assembly process of building truss structure The perspective view which shows the effect | action in the assembly process of the truss structure for construction Perspective view showing assembly process of building truss structure Sectional view showing bolt connection of truss member

Explanation of symbols

1a H-shape steel as truss member 3 Pipe material as truss member 8 Bolt T Unit truss RT Roof truss

Claims (4)

A construction truss structure in which at least three truss members are joined to each other,
A building truss structure in which one end of at least two truss members is joined by welding in a state where the end faces are brought into contact with each other, and the other end is joined to another truss member by a bolt.   The building truss structure according to claim 1, wherein a roof truss is configured by joining a truss composed of at least three truss members as one unit truss and joining many of the unit trusses.   The building truss structure according to claim 2, wherein a welded portion at one end of each of the at least two truss members is disposed below the roof truss.   The building truss structure according to any one of claims 1 to 3, wherein the at least two truss members are pipe members.

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