JP2003138647A - Beam member joint of prefabricated truss structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam member joint of a prefabricated truss structure, which does not have to be separately provided with a coupling part of a truss coupling member for coupling an outside truss structure with an inside truss structure even in the case of the structurally simple and large-scale prefabricated truss structure. SOLUTION: This beam member joint 5 is used when the prefabricated truss structure is constructed by joining a plurality of beam members 4 together. The joint 5 is sandwiched by engaging parts of ends of the beam members 4 with engaging recesses 61 of paired fastening members 6 which are provided with the engaging recesses 61 which the ends of the beam members 4 are partially engaged; a screw 71 is threaded at an end of the truss coupling member 8 for coupling the outside truss structure of the prefabricated truss structure with the inside truss structure thereof, and fitted for insertion into fitting holes 6a of the fastening members 6; and the fastening members 6 are fastened together by fastening nuts 72 and into which the screw 71 is screwed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a beam member joint of an assembled truss structure used for sequentially connecting beam members when assembling an assembled truss structure.

[0002]

2. Description of the Related Art As is well known, assembling truss structures are easy to assemble, are smart, and have excellent lighting and a wide pillar-free space, and are therefore widely used in the construction of various buildings. The joint method of beam members for constructing such an assembled truss structure is roughly classified into a ball joint method and a cylindrical joint method.

The former is for sequentially connecting frame members (beam members) using a spherical joint (hub) to the truss mark, and the latter is a cylindrical joint (hub) and a connecting end formed by crushing. A frame member (beam member) having a portion is used. By the way, the assembled truss structure means that the truss part has a shape such as a dome type, a mosque type, a pyramid type, a flat structure type, and a barrel vault type, and when they are independent structures, There is a case where they are arranged side by side as a part of the structural part of the construct, but any structure may be used.

As a beam member joint for the above-mentioned assembled truss structure, for example, "assembled truss structure" disclosed in Japanese Patent Laid-Open No. 10-325175 is known. The joint structure part of the assembly type truss structure which is the beam member joint disclosed in this conventional example is a frame (hereinafter, the frame is referred to as a beam by solving the drawback of the conventional joint method that the strength is weak. The purpose is to strengthen the joint structure. Hereinafter, referring to FIG. 7 which is a perspective view and FIG. 8 which is a cross-sectional view of an essential part of the joint structure portion of the assembly type truss structure according to the conventional example, the same name described in the publication, Also, description will be given using the same reference numerals.

The joining structure of the assembly type truss structure according to this conventional example includes a hub 3, a beam member 2 connected to an outer peripheral portion of the hub 3, and a flat portion 21a of the beam member 2 which will be described later. It has a configuration including an ashtray-shaped plate 11 which sandwiches the plate 11, a bolt 9 which applies a fastening force to the plate 11, and a nut 12. More specifically, a plurality of (six in this example) fitting grooves (not shown) are formed on the outer peripheral surface of the hub 3, and each of these fitting grooves extends toward the tip side. A flat portion 21a formed at the tip of the tapered portion 21 of the beam member 2 that is crushed so that the flatness increases with it, and a column for preventing pull-out provided at the tip of the flat portion 21a. The parts and are fitted. A convex portion 2 is formed on the outer peripheral edge of the plate 11.
2 and concave portions 23 are alternately formed.
3 are fitted to sandwich the upper and lower portions of the flat portion 21a of the beam member 2. Therefore, according to the joining structure portion of the assembled truss structure according to the conventional example, the convex portion 22 of the plate 11 is
As a result, the bending deformation of the beam member 2 is restrained, so that the strength of the truss structure is increased.

[0006]

According to the joining structure portion of the assembly type truss structure body according to the above-mentioned conventional example, there is no problem with respect to the connecting function and the connecting strength of the tip portion of the beam member.
Considered to be useful as such. However, in addition to the need for a hub with a complicated structure, which is provided with a plurality of fitting grooves for fitting the tip of the flat portion of the beam member, a cylindrical portion is formed at the tip of the flat portion of the beam member. It is necessary, and the structure of the joint structure is complicated, which inevitably results in high cost.

When the assembled truss structure is large, the truss structure may have two layers from the viewpoint of strength. In that case, the outer truss structure and the inner truss structure are rod-shaped. Must be connected with the truss connection member of. Therefore, it is necessary to provide a connecting portion for connecting a large number of truss connecting members to each of the outer truss structure and the inner truss structure, and it is not possible to reduce the construction cost of the assembled truss structure.

Therefore, the object of the present invention is to have a simple structure,
Moreover, even for a large assembled truss structure, it is possible to eliminate the need to separately provide a connecting portion of a truss connecting member that connects the outer truss structure and the inner truss structure to the beam of the assembled truss structure. It is to provide a member joint.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and therefore, in order to solve the above problems, a beam member for an assembled truss structure according to claim 1 of the present invention. The means adopted by the joint is a beam member joint of a prefabricated truss structure used for joining ends of a plurality of beam members, and a plurality of engagement recesses with which a part of the ends of the beam member are engaged. And a pair of fastening members that are arranged so that the ends of the beam members can be sandwiched so as to face each other on the side of the engaging recesses, and the pair of fastening members are inserted into through holes provided in the fastening members. And a fastening means for applying a fastening force to the fastening member.

The means adopted by the beam member joint of the assembled truss structure according to claim 2 of the present invention is the beam member joint of the assembled truss structure according to claim 1, wherein the fastening means is a tip portion. A truss connecting member that connects the outer truss structure and the inner truss structure with a screw, and a fastening nut that is screwed to the screw that is threaded at the tip of the truss connecting member. It is characterized by.

The means adopted by the beam member joint of the assembled truss structure according to claim 3 of the present invention is the beam member of the assembled truss structure according to any one of claims 1 and 2. In the joint, it is characterized in that the pair of fastening members and the beam member are provided with extraction preventing means for preventing extraction of the beam member.

According to a fourth aspect of the present invention, the means adopted by the beam member joint of the assembled truss structure according to claim 4 is the beam member joint of the assembled truss structure according to the third aspect, wherein the pull-out preventing means is the A screw hole provided in each of the pair of fastening members, an extraction preventing plate that is externally fitted to the beam member in advance and has a bolt insertion hole, and the screw insertion hole is passed through the bolt insertion hole and screwed into the screw hole. It is characterized in that it comprises a bolt for fixing the pull-out prevention plate to the end surface of the fastening member.

The means adopted by the beam member joint of the assembled truss structure according to claim 5 of the present invention is the beam member joint of the assembled truss structure according to claim 3, wherein the pull-out preventing means is A screw hole provided in each of the pair of fastening members, an extraction preventing plate which is externally fitted to the beam member in advance and has a bolt insertion hole, and the screw insertion hole which is passed through the bolt insertion hole and screwed into the screw hole. It is characterized by comprising a stud bolt and a nut screwed to the stud bolt to fix the pull-out preventing plate to the end surface of the fastening member.

The means adopted by the beam member joint of the assembled truss structure according to claim 6 of the present invention is the beam member joint of the assembled truss structure according to claim 3, in which the pull-out preventing means is It is characterized in that it comprises a pair of fastening members, pin holes provided at the ends of the beam members, and pull-out prevention pins fitted into these pin holes.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a beam member joint for an assembled truss structure according to Embodiment 1 of the present invention is joined to a beam member for a large assembled truss structure having a two-layer truss structure. FIG. 1 is a partial configuration explanatory view of a dome, which is an assembled truss structure including a two-layer truss structure, using a beam member joint as an example.
(a), FIG. 1 (b) which is a side view of the end portion of the beam member, FIG. 1 (c) which is a view on arrow A of FIG. 1 (b), and FIG. 2 (a) which is a plan view of the beam member joint.
2 (b) of a side sectional view of the beam member joint, FIG. 3 (a) of a rear view of the beam member joint, and FIG. 3 (b) of a sectional view taken along the line BB of FIG. 3 (a). Will be described sequentially.

Reference numeral 1 shown in FIG. 1 (a) is a dome which is a two-layer assembly type truss structure having an outer truss structure 2 and an inner truss structure 3, and the dome 1 has a hemispherical shape. It is configured. The truss structure 2 of this dome 1
As shown in FIG. 1B, a taper portion 41 is formed at the end portion of the beam member 4 of No. 3 so as to have a flatness that increases toward the tip end side. The tapered portions 41 of the beam member 4 are joined by a beam member joint 5 having a configuration described later, and the beam member joints 5 of the truss structures 2 and 3 are connected to each other by a plurality of rod-shaped trusses. They are connected by the connecting member 8. The beam member 4 is manufactured from a pipe made of, for example, an aluminum alloy.

The beam member joint 5 is constructed as shown in FIGS. 2 (a), 2 (b) and 3. In other words, a pair of six beam members 4 are arranged so that the tapered portions 41 of the beam members 4 can be pinched,
A fastening member 6, which will be described later and is formed in a hexagonal shape.
6 and a through hole 6a provided in the center of these fastening members 6
Of the truss connecting member 8 penetrating in the direction orthogonal to the beam member 4 and the fastening means 7 to be described later. The fastening means 7 includes a screw 71 formed by screwing a tip portion of the truss connecting member 8.
It is composed of two fastening nuts 72 screwed to the screw 71.

The fastening member 6 is made of a metal such as iron or an aluminum alloy by forging, casting, or machining, for example.
As shown in, the width of the engaging groove 61 gradually narrows from the end edge toward the center, and the engaging recesses 61 are formed at a plurality of positions (six positions). And these are arranged in a radial pattern. That is, in this beam member joint 5, the taper portion 41 formed at the tip portion of the beam member 4 by the inclined surface of the triangular groove of the engagement recess 61 in the vertical direction in FIG. That is, the tapered portions 41 of the beam member 4 are joined together by pinching a part of the curved surface formed at the end portion in the width direction from the vertical direction.

Further, each of the end faces (six places) of the fastening member 6 is provided with two screw holes 62,
By bolting the bolts 9a into the screw holes 62, the pull-out prevention plate 9 which is the pull-out preventing means that is externally fitted to the beam member 4 is fixed. By the way,
As well understood from (b), the tapered portion 4 of the beam member 4
1, the width in the up-down direction becomes larger as it goes to the tip side, so that the beam member 4 is not likely to be pulled out without the need to provide the above-mentioned pullout prevention plate 9. It seems to be. Nevertheless, the reason why the pullout preventing plate 9 is used is to prevent the expansion due to the bending deformation of the end edge side of the fastening member 6 due to the tensile force acting on the beam member 4. The bolt 9a screwed into the screw hole 62 can be replaced by a well-known stud and nut.

The usage of the beam member joint 5 of the assembled truss structure according to the first embodiment will be described below. The tapered portion 41 of the beam member 4 is engaged with the engagement recess 6 of the pair of fastening members 6.
1, and the tip end of the truss connecting member 8 is inserted into the through holes 6a formed in the pair of fastening members 6. Then, a fastening nut 72 is screwed to the projecting end of the screw 71 screwed at the tip of the truss connecting member 8 from the fastening member 6, and another screw is previously screwed to the screw 71. Since the fastening force is applied to the pair of fastening members 6 by fastening with the fastening nuts 72, the tapered portions 41 of the beam member 4 are joined together. Next, the bolt 9a is inserted into the bolt insertion hole of the pullout prevention plate 9 that is externally fitted to the beam member 4 in advance, and the bolt 9a is screwed into the screw hole 62 provided in the end surface of the fastening member 6, thereby the beam member joint. Although the work of joining the beam member 4 by means of 5 is completed, the dome 1 is repeated by repeating such work.
Will be built.

In the beam member joint 5 of the assembled truss structure according to the first embodiment, a pair of fastenings corresponding to the ashtray plate of the joint structure according to the conventional example, which can be easily manufactured by stamping and forging. Although the member 6 is required, a hub having a complicated structure as in the conventional example is unnecessary, and the tapered portion 41 is provided at the tip end portion of the beam member 4, but the tapered portion 4 is provided.
It is not necessary to provide a flat portion or a cylindrical portion at the tip of 1.

Therefore, according to the beam member joint 5 according to the first embodiment, since the structure of the beam member joint 5 is much simpler than the conventional example, the beam member joint 5 can be manufactured at low cost. be able to. Then, since the tapered portion 41 of the beam member 4 is simply sandwiched between the pair of fastening members 6 and fastened, the joining operation of the beam member 4 according to the first embodiment is performed by the flat portion and the columnar portion of the beam member. It is much simpler than the joining work of the conventional example in which and are moved vertically from the end opening side and fitted into the fitting groove of the hub.

Further, the beam member joint 5 according to the first embodiment.
According to this, the pair of fastening members 6 is fastened by utilizing the tip portion of the truss connecting member 8 used in the dome 1 having a large-sized two-layer truss structure. Therefore, since it is not necessary to provide a connecting portion for connecting the outer truss structure and the inner truss structure with the truss connecting member 8, especially when the dome 1 having a two-layer truss structure is constructed, the construction cost can be reduced. It has an excellent effect that it can greatly contribute to. When the dome 1 has a single-layer truss structure instead of a double-layer truss structure, a pair of fastening members 6 may be fastened using bolts and nuts as fastening means.

The beam member joint of the assembled truss structure according to the second embodiment of the present invention is shown in FIG.
It will be described with reference to FIG. 4A and a side sectional view of FIG. However, the beam member joint according to the second embodiment is different from the beam member joint according to the first embodiment in the difference in the configuration of the slip-out preventing means, and the other configurations are the same. The same parts and those having the same function are designated by the same reference numerals, and different points will be described.

A pin hole 62 whose radial center coincides with the valley line of each of the engaging recesses 61 formed at the six positions of the fastening member 6 is provided, and the pin hole is provided in the tapered portion 41 of the beam member 4. A pin hole 42 having the same diameter as 62 is provided.
Then, in a state where the ends of the beam member 4 are joined by the pair of fastening members 6, the pull-out prevention pin 9a is common to the pin hole 62 of the fastening member 6 and the pin hole 42 of the beam member. It will be. That is, in the case of the beam member joint according to the second embodiment, the pin holes 42, 6
The beam member withdrawal prevention means is constituted by 2 and the withdrawal prevention pin 9a. The withdrawal prevention pin 9a, like the withdrawal prevention plate 9 in the first embodiment, functions to prevent expansion due to bending deformation on the edge side of the fastening member 6, but can be replaced with a bolt. .

As described above, according to the beam member joint 5 of the assembled truss structure according to the second embodiment, the structure of the beam member slip-out preventing means is different from that of the beam member joint according to the first embodiment. Therefore, the beam member joint 5 according to the second embodiment has the same effect as the beam member joint according to the first embodiment.

The beam member joint of the assembled truss structure according to the third embodiment of the present invention is shown in FIG. 5 which is a diagram for explaining the configuration of the tip portion of the beam member, FIG. 6A which is a plan view thereof, and its fastening member. 6B of the back view of FIG. 6 and FIG. 6C of the arrow C view of FIG. 6B, the same as those of the first embodiment and those having the same function The different points will be described with reference numerals.

First, as shown in FIG. 5, a flange portion 43 having a diameter slightly larger than the outer diameter of the beam member 4 is formed at the tip of the beam member 4. The flange portion 43 is formed by, for example, a processing method similar to flare processing, crushing processing, or the like.

As shown in FIGS. 6 (a) and 6 (b), the beam member joint 5 includes a pair of hexagonal fastening members 6 (one of which is omitted). Fastening member 6
A through hole 6a into which the fastening means is inserted is provided at the center position of the position. This fastening member 6 is manufactured by forging, casting, or machining similarly to the case of the first embodiment, and the back surface side thereof is shown in FIGS. 6 (b) and 6 (c). As shown, the first circular groove portion 61a is formed near the edge portion and has a shallow radius having a radius of curvature equivalent to the outer diameter dimension of the beam member 4, and the fastening member 6 of the first circular groove portion 61a. It is formed on the side of the through hole 6a and has a polar radius equal to the outer diameter dimension of the flange portion 43 of the beam member 4, the depth is deeper than the first circular groove portion 61a, and the width is slightly wider than the thickness of the flange portion 43. Is formed with a wide second circular groove portion 61b.

Similar to the beam member joint according to the first embodiment, the engaging recesses 61 are formed at six positions on the back surface of the fastening member 6, and these are arranged radially radially. As is well understood from the above description, the pull-out preventing means for the beam member joint 5 according to the third embodiment is the second one.
The circular groove portion 61b is constituted by the side wall and the surface of the flange portion 43 in the thickness direction. In the third embodiment, as described above, the flange portion 43 is fitted into the second circular groove portion 61b, but it need not be a circular groove and may be horizontal grooves having the same depth, for example.

According to the beam member joint 5 of the assembled truss structure according to the third embodiment, the end portions of the beam members 4 are clamped between the first circular groove portions 61a, 61a of the pair of fastening members 6. Beam member 4 by means of a flange portion 43 that is joined together and is sandwiched between the second circular groove portions 61b and 61b.
Since the removal of the
Has the same effect as that of the first or second embodiment.

The beam member joint 5 of the assembled truss structure according to the third embodiment does not require the removal preventing plate as in the first embodiment, and the removal as in the second embodiment. Since the prevention pin is unnecessary and the number of parts is small, there is an excellent effect that the manufacturing cost of the beam member joint 5 and the assembly cost of the dome 1 are more advantageous than those of the first or second embodiment.

In the above first to third embodiments, 6
Although the beam member joint 5 that joins the beam members 4 of the present invention has been described as an example, the present invention is not limited to this and is also applicable to a beam member joint that joins three, four, and five beam members, for example. Since the technical idea of (4) can be applied, the present invention is not limited to the beam member joint for joining the six beam members 4 according to the first to third embodiments.

[0034]

As described above, the beam member joint 5 of the assembled truss structure according to claims 1 to 6 of the present invention is a pair of ashtray-shaped plates of the joint structure according to the conventional example. Although it requires a fastening member, it does not require a hub having a complicated structure as in the conventional example, and further, it does not need to provide a flat portion or a cylindrical portion at the tip of the beam member.

Therefore, according to the beam member joint 5 of the assembled truss structure according to claims 1 to 6 of the present invention, the structure of the beam member joint is much simpler than that of the conventional example. The joint can be manufactured at low cost. And
Since the end portion of the beam member is simply sandwiched between the pair of fastening members and fastened, the joining operation of the beam member is performed by moving the flat portion and the columnar portion of the beam member vertically from the end opening side. It is much simpler than the conventional joining work of fitting in the fitting groove of the hub.

Further, according to the beam member joint 5 according to the second aspect of the present invention, the pair of fastening members is fastened by utilizing the tip portion of the truss connecting member which is large and is used for the two-layer truss structure. However, since it is not necessary to provide a connecting portion for connecting the outer truss structure and the inner truss structure with the truss connecting member, particularly in the case of constructing a prefabricated truss structure of a two-layer truss structure, the construction It has an excellent effect that it can greatly contribute to cost reduction.

[Brief description of drawings]

1A and 1B relate to a first embodiment of the present invention, FIG. 1A is a partial configuration explanatory view of a dome which is an assembled truss structure having a two-layer truss structure, and FIG. 1B is a beam member. FIG. 1C is a side view of the end of FIG.

FIG. 2 relates to the first embodiment of the present invention, FIG. 2 (a) is a plan view of a beam member joint, and FIG. 2 (b) is a side sectional view of the beam member joint.

FIG. 3 relates to the first embodiment of the present invention, FIG. 3 (a) is a rear view of the beam member joint, and FIG. 3 (b) is a sectional view taken along line BB of FIG. 3 (a).

FIG. 4 relates to Embodiment 2 of the present invention, FIG. 4 (a) is a rear view of a fastening member of a beam member joint, and FIG. 4 (b) is a side sectional view of the beam member joint.

FIG. 5 is an explanatory view of a tip end portion configuration of a beam member according to the third embodiment of the present invention.

6A and 6B relate to Embodiment 3 of the present invention, FIG. 6A is a plan view of a beam member joint, FIG. 6B is a rear view of a fastening member of a beam member joint, and FIG. FIG. 6 (b) is a view on arrow C.

FIG. 7 is a perspective view of a joining structure portion of a prefabricated truss structure body according to a conventional example.

FIG. 8 is a cross-sectional view of a main part of a joint structure portion of a prefabricated truss structure body according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dome 2 ... Outer truss structure 3 ... Inner truss structure 4 ... Beam member, 41 ... Tapered part, 42 ... Pin hole, 43 ... Flange part 5 ... Beam member joint 6 ... Fastening member, 6a ... Through hole, 61 ... Engagement recess, 61a
... 1st circular groove part, 61b ... 2nd circular groove part, 62 ... Screw hole or pin hole 7 ... Fastening means, 71 ... Screw, 72 ... Fastening nut 8 ... Truss connecting member 9 ... Withdrawal prevention plate, 9a ... Bolt or withdrawal prevention pin

Claims (6)

[Claims] 1. A beam member joint of a prefabricated truss structure, which is used when joining end portions of a plurality of beam members,
A plurality of engagement recesses are formed in which a part of the end portions of the beam member are engaged, and a pair of engagement recesses are disposed so that the end portions of the beam member are opposed to each other so that the end portions of the beam member can be pinched. A beam member joint for an assembled truss structure, comprising: fastening members; and fastening means that are inserted into through holes provided in these fastening members and apply a fastening force to the pair of fastening members. 2. The fastening means includes a truss connecting member having a tip end threaded to connect the outer truss structure and the inner truss structure, and the threaded end part of the truss connecting member. The beam member joint for an assembled truss structure according to claim 1, comprising a fastening nut screwed to the screw. 3. The pair of fastening members and the beam member are provided with withdrawal preventing means for preventing the withdrawal of the beam member, according to any one of claims 1 and 2. Beam member joint of the prefabricated truss structure described in. 4. The pull-out preventing means includes a screw hole provided in each of the pair of fastening members, a pull-out preventing plate which is externally fitted to the beam member in advance and has a bolt insertion hole, and the bolt insertion hole. The beam member joint for an assembled truss structure according to claim 3, further comprising: a bolt that is screwed into the screw hole to fix the extraction preventing plate to an end surface of the fastening member. 5. The pull-out preventing means includes screw holes provided in each of the pair of fastening members, a pull-out preventing plate that is externally fitted to the beam member in advance and has a bolt inserting hole, and the bolt inserting hole. And a nut that is screwed to the screw hole and that is screwed to the bolt and that fixes the extraction preventing plate to the end surface of the fastening member. The beam member joint of the prefabricated truss structure according to item 3. 6. The pull-out preventing means comprises: the pair of fastening members, pin holes provided at an end portion of the beam member, and pull-out preventing pins fitted into these pin holes. Item 3. A beam member joint for an assembled truss structure according to Item 3.