JP2017206818A - Lattice material junction structure of double layer truss frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lattice material junction structure of a double layer truss frame that enables both ends of the lattice material to connect readily to an upper chord material joint part and a lower chord material joint part, even with the lattice material of a double layer truss frame with which the upper chord material and the lower chord material are in a twisted positional relationship.SOLUTION: In a region of a structural plane of a truss connecting two adjacent joint parts of a double layer truss frame, a plane F is assumed that intersects with the structural plane of the truss, with a member axis of a lattice material 3 functioning as an intersecting line, the intersection being with regard to two triangular planes defined by axes of three members, namely, the lattice material 3 for connecting an upper chord material joint part Jand a lower chord material joint part J, an upper chord material 1 or lower chord material 2 each connected to both ends of the lattice material 3, and a strut 3. The plane F is joined with a surface of a gusset plate 55 for connecting the lattice material 3 to the joint part of the upper chord material 1 or the lower chord material 2 of the double layer truss frame. A rib plate 6 for connecting the gusset plate 55 with a strut 4, or the rib plate 6 for connecting the gusset plate 55 with the upper chord material 1 or the lower chord material 2, is provided.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a lattice material joining structure of a multi-layer truss structure mainly used for a roof having a curved surface such as a dome roof, and even a lattice material of a multi-layer truss structure in which the upper chord material and the lower chord material are twisted. The both ends of the lattice material can be easily and easily joined to the upper chord material and the lower chord material.

  FIG. 1 (a) shows an example of a multi-layer space truss frame used for a roof having a curved surface such as a dome roof, and includes an upper chord member 1 and a lower chord member 2, and the upper chord member 1 and the lower chord member 2 It is composed of a plurality of lattice materials (diagonal materials) 3 and a bundle material 4 placed between them.

  These truss constituent members are formed of a shape steel such as H-shaped steel, angle steel, groove-shaped steel, or a circular steel pipe, and are joined to each other via a joining plate such as a gusset plate to constitute a truss beam. These truss beams cross each other at each node and are joined together to form a multi-layer solid truss. In addition, each truss structural member of the multilayered three-dimensional truss frame shown in figure is formed from the H-section steel.

  By the way, in the multi-layered truss frame described above, when the upper chord member 1 and the lower chord member 2 of each truss beam are installed in the same plane, the lattice member 3 is also in the same plane as the upper chord member 1 and the lower chord member 2. Since they are installed, these both end portions can be easily and easily joined to the upper chord material 1 and the lower chord material 2 via the gusset plate.

  However, in the case of a multi-layer truss frame used for a curved roof such as a dome roof, the truss beam is twisted by θ around its axis XX, depending on the shape of the roof surface, as shown in Fig. 2 (a). May be erected. In this case, the upper chord material 1 and the lower chord material 2 are installed in a mutually twisted positional relationship, and the upper chord material 1 and the lower chord material 2 are also installed so as to be twisted around the material axis.

  FIGS. 2 (a) and 2 (b) show a truss W on one surface of the multi-layer truss beam. The upper chord installed between the adjacent two nodes of the upper chord member 1 and the lower chord member 2 is shown in FIGS. It is composed of a material 1 and a lower chord material 2 and a plurality of lattice materials 3 and a bundle material 4 installed between the upper chord material 1 and the lower chord material 2.

  In order to install a plurality of lattice materials 3 between the upper chord material 1 and the lower chord material 2 in such a twisted positional relationship, as shown in FIGS. 3 (a) and 3 (b), the lattice material 3 is Although it is necessary to bend along the truss construction surface (illustrated by a thick broken line), the lattice material 3 that should be a straight material cannot be bent. Therefore, it is necessary to join the lattice material attached to the upper chord material 1 and the lower chord material 2. It is necessary to bend the gusset plate 5 in the axial direction of the lattice material 3 so that both ends of the lattice material 3 (flange or web edge) are joined at the surface.

  However, since the gusset plate 5 generally has a different shape, size, and mounting angle depending on the mounting position of the lattice material 3, it is necessary to form the gusset plate 5 one by one for each position of the lattice material 3. In addition, it takes a lot of labor and cost, and it has been extremely difficult to attach to the flange surface or web surface of the upper chord material 1 and the lower chord material 2 twisted around the material axis with high accuracy.

  For this reason, when a roof having a curved surface such as a dome roof is conventionally constructed by a multi-layered solid truss, the edge of the lattice material is gusseted to the upper chord material and the lower chord material, particularly at the position where the truss is twisted and installed. However, there is a problem that the complicated and time-consuming bending process of the gusset plate 5 as shown in FIG.

  In the case of a single-layer truss structure as shown in Fig. 1 (b), which has no lattice material and no bundling material, only the string material is twisted around the axis. By twisting, it is possible to eliminate the difference between the flange surface or web surface of the chord end and the surface of the joint plate constituting the node member, so that the problem of the joint can be solved relatively easily. Yes, it has been put to practical use.

  In addition, Patent Document 1 discloses an example of the prior art relating to the structure of the joint portion for joining the truss constituent members of the multi-layer truss frame. In Patent Document 1, the upper chord material, the lower chord material, and the lattice material (diagonal material) are joined after being individually twisted.

  The upper chord material and the lower chord material are twisted around the respective axis in the manner of a single-layer truss, thereby eliminating the difference between the gusset plates at each node (Patent Documents 1 [0014] to [0020]). ).

  On the other hand, the lattice material may be twisted around its axis to match the axis of the upper chord material and the lower chord material, but the lattice material is formed from a circular steel pipe, and the upper chord material and the lower chord material are inserted through gusset plates. By joining together, the end joining plate surfaces attached to both ends of the lattice material can be matched with the respective surfaces of the gusset plates attached to the upper chord material and the lower chord material, so twist the lattice material itself There is no need.

Japanese Patent No. 3418659

  However, as shown in FIGS. 2 and 3, the prior art disclosed in Patent Document 1 installs a lattice material in the middle portion between the upper chord material and the lower chord material, and the ends of the lattice material are connected to the upper chord material and the lower chord material. There remains a problem in that it is assumed to be joined by welding via a gusset plate on the side of the torsion section.

  That is, if the gusset plate is welded to the sides of the upper chord material and the lower chord material before being twisted, and then the upper chord material and the lower chord material are twisted, the mounting angle of the gusset plate may be out of order, It is difficult to ensure accuracy.

  On the other hand, when the gusset plates are welded to the sides of the upper chord and lower chord after being twisted, the upper chord and the lower chord are distorted by welding heat, which not only adversely affects the accuracy of the twist angle, but also the twisted flange surface Alternatively, it is difficult to ensure the accuracy of the position of the gusset plate and the mounting angle with respect to the web surface.

  For this reason, the method of welding the gusset plate for attaching the lattice material to the torsion section of the upper chord material and the lower chord material has a problem that it is difficult in actual production.

  Even when the gusset plate is attached to the upper chord material and the lower chord material with joint bolts, the flange surface and web surface of the upper chord material and the lower chord material are twisted, so ensure the mounting angle of the gusset plate surface. Is still difficult.

  As described above, the prior art of Patent Document 1 has a problem regarding the structure for attaching the lattice material when the upper chord material and the lower chord material are in a mutually twisted positional relationship. There was no clear description or suggestion, and it was a remaining issue.

  Furthermore, in any of the above cases, the two gusset plates to be joined to both ends of one lattice material also require processing such as bending according to the axial direction of the lattice material. It was.

  The present invention has been made in order to solve the above-described problems, and it is easy to easily apply the lattice material of the multi-layer truss in which the upper chord material and the lower chord material are twisted to each other to the upper chord material and the lower chord material. It is an object of the present invention to provide a lattice material joining structure of a multi-layer truss structure that can be joined to each other.

  The invention described in claim 1 includes a lattice material connecting an upper chord material node portion and a lower chord material node portion within a range of one truss surface connecting two adjacent node portions of the multi-layer truss frame; With respect to two triangular planes determined by the three member axes of the upper chord member or the lower chord member and the bundle member respectively joined to both ends, the above-mentioned truss structure plane with the member axis of the lattice member as an interpenet Assuming another plane intersecting, the plane and the plane of the gusset plate for joining the lattice material to the node portion of the upper chord member or lower chord member of the multi-layer truss frame, and the gusset plate and the A rib plate that joins the bundle member or a rib plate that joins the gusset plate and the upper chord member or the lower chord member is provided.

  The invention described in claim 2 is a lattice material connecting an upper chord material node portion and a lower chord material node portion within a range of one truss surface connecting two adjacent node portions of a multi-layer truss frame, and the lattice With respect to two triangular planes determined by the three member axes of the upper chord member or the lower chord member and the bundle member respectively joined to both ends of the member, the structure of the truss Assuming another plane intersecting the plane, the plane and the plane of the gusset plate for joining the lattice material to the node portion of the upper chord member or lower chord member of the multi-layer truss frame are combined, and the upper chord member Alternatively, an upper chord material node member or a lower chord material node member is attached to a node portion of the lower chord material, and both ends of the upper chord material or the lower chord material are joined to the upper chord material node member or the lower chord material node member, and the lattice material Joining It is characterized in that the rib plate for joining said top chord member joint member or the lower chord member joint member and the gusset plate because is provided.

  The invention according to claim 3 is the first embodiment of the first embodiment, wherein the first layer of the multi-layer truss lattice structure is connected to the adjacent two nodes of the multi-layer truss frame. Two planes intersecting one truss plane are assumed with the lattice axis of the lattice material connecting the lumber node portion and the lower chord material node portion as an interpenet, and each plane and the upper chord material of the multi-layer truss frame Alternatively, the gusset plate surface for joining the lattice material to the nodal portion of the lower chord material is combined.

  Shape steel such as H-shaped steel, groove-shaped steel and angle steel can be used for each truss component of upper chord material, lower chord material, lattice material and bundle material, and circular steel pipes etc. can also be used for lattice material can do.

  Next, the present invention will be described more specifically with reference to FIGS. One of the problems to be solved is a problem of ensuring the accuracy of the gusset plate when the end portion of the lattice material is joined to the intermediate portion of the twisted upper chord material and the lower chord material.

As shown in FIG. 4 (a), the problem is that there is one lattice material 3 in the range W of one truss surface connecting two adjacent nodes, and both ends of the lattice material 3 are upper chord materials. This can be solved by joining the node portion J ₁ and the lower chord material node portion J ₂ of the adjacent node. That is, the problem can be solved by not joining the both ends of the lattice material 3 to the intermediate portion between the upper chord material 1 and the lower chord material 2.

  Next, a solution for the second problem to be solved will be described. When the upper chord material 1 and the lower chord material 2 are in a relatively twisted positional relationship, as shown in FIG. 4 (b) showing a sectional view of the knee line in FIG. 4 (a), the upper chord material 1 Since the direction of the member cross-section (H-section steel web surface) does not match, the direction of the gusset plates 5 and 5 is aligned with the axial direction of the lattice material 3 (groove-shaped steel in FIG. 4). For this, it is necessary to bend the gusset plates 5 and 5 and twist the lattice material 3 about its axis in the direction of the web surface of the upper chord member 1 and the lower chord member 2.

  Further, the joint surfaces of the bundle members 4 and 4 sharing these gusset plates 5 and 5 are attached on the extension of the web surface at the node portions of the upper chord member 1 and the lower chord member 2, and the gusset plates 5 and 5 Is constrained by the end joint surfaces of the bundles 4 and 4, so that the gusset plates 5 and 5 are twisted according to the axial direction of the lattice material 3 or bent twice. It is necessary to match the end joint surface (web surface of channel steel) of the lattice material 3 with the surfaces of the gusset plates 5 and 5.

  This problem can be solved by arranging the members as shown in the conceptual diagrams shown in FIGS. That is, the upper chord material 1 and the lower chord material 2 are not in the same plane but are twisted in a single-layer truss structure (the dotted rectangle in FIG. 5 (a) shows the state before being twisted. 1), a single lattice material 3 connecting the upper chord material node portion A and the lower chord material node portion C, and the upper chord material 1 or the lower chord material 2 and the bundle material 4 3 joined to both ends of the lattice material 3, respectively. Assume another plane F that intersects the member axis AC of the one lattice material 3 as an intermeshing line with respect to two triangular planes ACB or ACD determined by one member axis.

  The plane F and at least one end joint surface or end joint plate surface (hereinafter abbreviated as end joint surface) f of the lattice material 3 are the upper chord material node A or the lower chord material node of the multilayer truss. Match the surface of the gusset plate 55 to be joined to the part C, and the gusset plate 55 and the bundle material 4 (see FIGS. 5 (a) to (c)), or the gusset plate 55 and the upper chord material 1, or the gusset plate 55 A rib plate 6 is provided to join the lower chord material 2 (see FIG. 6 (a)).

  In this case, the triangle ACB and the triangle ACD shown in FIG. 5 (a) are not in the same plane, but share the straight line AC, and the surfaces of the rib plates 6, 6 at both ends of the lattice material 3 are respectively Of the triangle ACB and the triangle ACD. Further, the gusset plates 55 and 55 and the rib plates 6 and 6 are not necessarily orthogonal.

In addition, as shown in FIG. 6 (b), in the case of a multi-layered truss frame in which a plurality of upper chord members ₁ and lower chord members ₂ are gathered in multiple directions at upper chord member nodal portion J1 and lower chord member nodal portion J2. The upper chord material node member K ₁ and the lower chord material node member K ₂ are respectively attached to the upper and lower ends of the bundle material 4 of the upper chord material node portion J _I and the lower chord material node portion J ₂ , and the plurality of upper chord materials are attached to these node members. 1 and the both ends of the lower chord material 2 are joined by a joining bolt or the like.

In this case, the rib plates 6,6 shown in FIG. 6 (a), as shown in FIG. 6 (b), the gusset plates 55 and 55 respectively corresponding to the upper chord member joint member K ₁ or the lower chord member joint member K ₂ will be joined.

  As described above, since the end joint surfaces f and f at both ends of the lattice material 3 are in the plane F, the lattice material 3 is joined to the gusset plates 55 and 55 without twisting. Thus, the processing of the gusset plate, such as twisting of the gusset plates 5 and 5 and bending twice, which was the second problem, is not necessary.

  The plane F in FIG. 5 (a) is a case of a single plane including the straight line AC, and it is assumed that the lattice member 3 is a cross-sectional member formed of a plane such as a grooved steel. Is used, the plane F is not necessarily a single plane.

  That is, even if the plane F is divided into two planes having an intersecting angle φ as shown in FIG. 6 (c), if the lattice material 3 is a circular steel pipe, the lattice section of the lattice material is circular. The surfaces of the plates 55 and 55 and the end joining surfaces f and f can be rotated in accordance with the respective planes F to be joined to both ends of the lattice material 3 (the invention according to claim 3).

  Since the present invention is configured as described above, in the multi-layer truss frame where the upper chord material and the lower chord material are not in the same plane and are twisted, the twisted upper chord material and the lower chord material While avoiding joining of the lattice material to the intermediate portion, it is not necessary to twist the lattice material, nor to twist or bend it in accordance with the axial direction of the lattice material unlike the conventional gusset plate.

  Therefore, it is possible to provide a lattice material joining structure that can be easily manufactured without unreasonableness to join both end portions of the lattice material to the node portions of the upper chord material and the lower chord material.

  It should be noted that the present invention can be applied even if the upper chord material and the lower chord material are not twisted because there is no joining between the lattice material and the middle portion of the upper chord material and the lower chord material.

  As described above, the present invention can easily join both end portions of the upper chord material and the lower chord material to the nodes of the multi-layer truss frame structure in which the upper chord material and the lower chord material are twisted. The following effects can be obtained.

(1) Since the plane of the lattice joint gusset plate provided at the upper and lower chord nodes of the multi-layer truss is aligned with one plane that intersects the truss construction plane with the axis of one lattice as the interpenet, Both ends of the lattice material can be joined without being twisted, and there is no need to twist or bend the surface direction of the gusset plate in accordance with the axis of the lattice material as in the prior art.

(2) If the gusset plates to be joined to both ends of the lattice material are not formed in the same plane, the lattice material is a circular steel pipe, and the end joint plate surfaces at both ends of the lattice material are at angles of the gusset plates facing each other. If combined, the lattice material can be easily attached without problems.

(3) The problem left in the prior art described in Patent Document 1 is solved, and even a joint part of a multi-layer space truss that forms a non-uniform curved surface is easy to manufacture and greatly contributes to cost reduction. it can.

FIG. 1 (a) is a partial perspective view of an example of a multi-layered solid truss frame, and FIG. 1 (b) is a partial perspective view of an example of a single-layer solid truss frame. FIG. 2 (a) is a side view and FIG. 2 (b) is a cross-sectional view taken along the line II in FIG. 2 (a). 2 shows a state where the truss beam shown in FIG. 2 is rotated about the XX axis by θ, and FIG. 3 (a) is a cross-sectional view of the roll line in FIG. 2 (a) (only the axis is shown). Fig. 3 (b) is a cross-sectional view of the ha-ha line in Fig. 2 (a) (only the shaft core is displayed), and Fig. 3 (c) is a straight line display of the lattice material axis (thick broken line) in Fig. 2 (a). Is. FIGS. 4A and 4B show an example of a truss beam for explaining the present invention, in which FIG. 4A is a side view and FIG. 4B is a sectional view of a knee line in FIG. 5A and 5B are views for explaining the concept when the lattice material joining structure of the present invention is applied to the truss beam shown in FIG. 4. FIG. 5A is a side view, and FIG. 5B is a diagram in FIG. FIG. 5 (c) is a cross-sectional view of the ho-ho line in FIG. 5 (a). FIG. 6 is a view for explaining the concept when the lattice material joining structure of the present invention is applied to the truss beam shown in FIG. 4, and FIG. 6 (a) is a side view when the position of the rib plate is changed in FIG. 5 (a). FIG. 6 (b) is a side view when the upper chord material nodal member is attached to the upper and lower ends of the bundle material, and FIG. 6 (c) is an explanatory view when the plane F is divided into two surfaces. 7A and 7B are diagrams illustrating a first embodiment of the present invention, in which FIG. 7A is a side view, FIG. 7B is a cross-sectional view taken along the line H in FIG. 7A, and FIG. FIG. 7 (d) is a cross-sectional view of the teach line. FIGS. 8A and 8B are views for explaining a second embodiment of the present invention, FIG. 8A being a side view, and FIG. 8B being a cross-sectional view in FIG. FIGS. 9A and 9B are diagrams illustrating a third embodiment of the present invention, FIG. 9A is a side view, FIG. 9B is a cross-sectional view along the line H in FIG. 9A, and FIG. FIG. 9 (d) is a cross-sectional view of the teach line.

FIGS. 7A to 7D are one embodiment of the present invention and illustrate the upper chord material node of the multi-layered solid truss frame. In the figure, each upper end portion of the plurality of upper chord members ₁ and 1a made of H-shaped steel and each upper end portion of the lattice material 3 and the bundle member 4 made of grooved steel are upper chord material node members K at the upper chord material node portion J1. ₁ , a gusset plate 55 and a gusset plate 7.

Installation top chord member 1, on the drawing, is disposed relative to both sides of the upper chord member joint member K _1, upper chord member 1a is to cross the axis and oblique upper chord member 1 via the upper chord member joint member K ₁ Has been.

The upper chord material node member K ₁ is in a vertical plane including upper and lower horizontal flanges arranged at the same level as the upper and lower flanges of the upper chord material 1 and the upper chord material 1a, and the upper chord material 1 and 1a web between the upper and lower horizontal flanges. It is integrally formed from a plurality of arranged webs.

Further, the joint 11 is provided at an end portion opposite to the position of each upper chord member 1,1a New Moon material joint member K _1, the upper and lower flanges and the web of the end of each upper chord member 1,1a in the joint 11 is a plurality Are joined by joining plates and joining bolts.

The lattice material 3 and the bundle material 4 are formed in a cross-sectional H shape by joining two channel steels back to back, of which the upper end portion of the lattice material 3 is a gusset plate 55 on the lower flange of the upper chord material node member K ₁ The upper end portion of the bundle 4 is joined via a gusset plate 7.

The gusset plate 55 is attached to the lower flange of the upper chord material node member K ₁ , and is attached in parallel to one plane in the out-of-plane direction of the truss structure surface including the axis of the lattice material 3.

Gusset plate 7 is installed in a vertical plane containing the axial intersection of the upper chord member 1 and 1a, and are attached by welding to the lower flange of the upper chord member joint member K _1.

Rib plate 6 is attached by welding is installed in a vertical plane containing the axis of the lattice member 3 and Tabazai 4, and the upper chord member joint member K lower flange and gusset plate 55 and the gusset plates 7 of _one.

Note that, as illustrated, the intersection P between the axis of the axis and the lattice material 3 Tabazai 4 bonded to the top chord member joint member K ₁ is on the axis of the upper chord member 1 and 1a, Tabazai 4 The rib plate 6 joined to the gusset plate 7 reinforces the gusset plate 55 joining the lattice material 3.

Further, when the lattice material 3 gathers at the upper chord material node J ₁ from two directions, the gusset plate 55 is spread as shown in FIG. 7B, and ribs are formed in the vertical plane including the axis of each lattice material 3. Each plate 6 is attached. The crossing angle between the rib plate 6 and the gusset plate 55 need not be a right angle.

Further, if the upper chord material side and lower chord material side (not shown) gusset plates 55 are in the same plane, the both ends of the lattice material 3 are connected to the upper chord material node J ₁ without twisting the lattice material 3. it can be bonded to the top chord member joint member K ₁ and the lower chord member joint portion J ₂ of the lower chord member joint member K ₂ (Figure omitted). Therefore, there is no need to bend the gusset plate 55 as in the prior art.

In the embodiment shown in FIGS. 7 (a) to (d), the intersection point P between the axis of the bundle 4 and the axis of the lattice 3 is on the axis of the upper chord 1,1a, and Since the angle formed between the lattice material 3 and the upper chord material 1, 1 a is shallow, the contact position between the gusset plate 55 and the lower flange surface of the upper chord material node member K ₁ on the extension of the upper chord material 1, 1 a is considerably from the intersection P A stiffener 8 is attached to reinforce the lower flange because it is in a remote position.

Further, as illustrated in FIG. 7 (a), since the rib plate 6 is longer in the horizontal direction, a portion of the upper side is welded to the lower flange of the upper chord member joint member K _1, the axial force of the lattice material 3 It plays the role of transmitting a part of the horizontal component to the upper chord material 1,1a.

FIGS. 8 (a) and 8 (b) are other embodiments of the present invention, and illustrate the upper chord material node of the multi-layered solid truss frame. In the figure, the configuration is basically the same as that of the embodiment described in FIGS. 7 (a) to 7 (d), but the intersection P between the axis of the lattice material 3 and the axis of the bundle 4 is the upper chord material. The lattice material 3 and the bundle material 4 are installed so as to be located on the lower surface of the lower flange of the node member K ₁ , and thereby the rib plate 6 formed long in the embodiment described in FIGS. 7 (a) to (d). Can be formed short, and the stiffener 8 can be omitted.

Incidentally, as shown in FIG. 8 (a), since the rib plate 6 is shorter in the horizontal direction, the upper side because no attached to a lower surface of the upper chord member joint member K _1, is a directly axial force of lattice material 3 Only the gusset plate 55 has the role of transmitting the horizontal component to the upper chord material 1,1a.

To reinforce it, it may be attached to additional rib plate 6a between the gusset plate 55 and the upper chord member joint member K _1. The rib plate 6a is not necessarily in the same plane as the rib plate 6.

  FIGS. 9 (a) to 9 (d) are other embodiments of the present invention, and illustrate the upper chord material node of the multi-layered solid truss frame. In the embodiment shown in FIGS. 9A and 9B, the lattice material 3 and the bundle material 4 are formed of a circular steel pipe.

  Further, the rib plates 10 and 10 are attached to both sides of the gusset plate 55 symmetrically and orthogonally to the gusset plate 55.

The rib plate 10 on the upper chord material 1 side is attached by welding to the lower flange of the upper chord material nodal member K ₁ and the gusset plate 55.

  Further, end joining plates 9 are attached to the upper ends of the lattice material 3 and the bundle material 4. The end joining plate 9 is formed in a cross-shaped cross section and is formed in the same plane as the gusset plate 55 and the rib plate 10.

  The end joining plate 9 at the end of the lattice material 3 is bolted to the gusset plate 55 and the rib plate 10 by a joining plate and a joining bolt. Further, the end joining plate 9 at the end of the bundle 4 is bolted to the gusset plate 7 and the rib plate 6 by a joining plate and a joining bolt.

Incidentally, the upper side of the rib plate 10 provided on the upper surface of the gusset plate 55 is attached to the lower surface of the upper chord member joint member k _1, directly transmits part of the horizontal component of the axial force of the lattice member 3 in top chord member 1 To play a role.

  When a circular steel pipe is used for the lattice material 3, the buckling strength is higher than that of the L-shaped steel and the groove-shaped steel, and therefore, it is suitable for a three-dimensional multi-layer truss having a long inter-node dimension.

  Further, in the case of a lattice material made of a circular steel pipe, even if the gusset plates 55 and 55 facing both ends of the lattice material 3 are not in the same plane (see FIG. 6 (c)), the end joint plates 9 and 9 This surface has an advantage that it can be attached to both ends of the lattice material 3 in accordance with the angles of the gusset plates 55 and 55 facing each other.

  The present invention is a multi-layer truss frame mainly used for a roof having a curved surface such as a dome roof, so that both ends of a lattice material constituting the multi-layer truss frame can be easily and easily joined to the upper chord material and the lower chord material. .

1,1a: Upper chord material
2,2a: Lower chord material
3,3a: Lattice material 4: Bundle material
5,7,55: Gusset plate
6,6a: Rib plate 8: Stiffener 9: End joint plate
10: Rib plate
11: Fitting
A, B, C, D: Node F: Plane f: End joint surface, end joint plate surface
J ₁ : Upper chord material node
j ₂ : Lower chord material node
K ₁ : Upper chord member
K ₂ : Lower chord material node member W: Range of one truss surface θ: Torsion angle of truss φ: Intersection angle of two planes F

Claims (3)

  Lattice material connecting the upper chord material node portion and the lower chord material node portion, and the upper chord joined to both ends of the lattice material, in the range of one truss surface connecting two adjacent node portions of the multi-layer truss frame Assuming another plane that intersects the plane of the truss with two lattice planes determined by the three member axes of the material or lower chord material and the bundle material, with the member axis of the lattice material as an interpenet. The rib plate that joins the plane and the surface of the gusset plate for joining the lattice material to the joint portion of the upper chord member or the lower chord member of the multi-layer truss frame and joins the gusset plate and the bundle member Or a rib plate joining structure for multi-layer trusses, wherein a rib plate for joining the gusset plate and the upper chord member or the lower chord member is provided.   Lattice material connecting the upper chord material node portion and the lower chord material node portion, and the upper chord joined to both ends of the lattice material, in the range of one truss surface connecting two adjacent node portions of the multi-layer truss frame Assuming another plane that intersects one plane of the truss with the member axis of the lattice material as an intermittence line with respect to two triangular planes determined by the three member axes of the material or lower chord material and bundle material The plane and the surface of the gusset plate for joining the lattice material to the joint portion of the upper chord member or the lower chord member of the multi-layer truss frame, and the upper chord member node to the joint portion of the upper chord member or the lower chord member A member or a lower chord material node member is attached, and both ends of the upper chord material or the lower chord material are joined to the upper chord material node member or the lower chord material node member, and a gusset plate for joining the lattice material, Lattice material bonding structure of multi-layer truss, wherein the serial rib plate that joins the top chord member joint member or the lower chord member joint member.   3. A multi-layer truss lattice joint structure according to claim 1 or 2, wherein an upper chord material node portion and a lower chord material node portion installed in a truss structure connecting two adjacent node portions of the multi-layer truss frame. Assuming that the plane of the lattice material to be connected is an intermittence line, two planes intersecting the truss structure plane are assumed, and each plane and the lattice material of the upper chord material or lower chord material of the multi-layer truss frame are connected to the lattice material. Lattice material joining structure of multi-layer truss characterized by combining with the face of gusset plate for joining

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