Space truss structure

Abstract

To provide a space truss structure capable of improving workability by reducing the burden of inserting bolts and fastening with nuts. [Solution] The string members (11a-11c) have string member-side connecting parts with string member-side bolt holes and slits of a predetermined width at both ends of the string member body; diagonal members (12a, 12b) have diagonal member-side bolt holes at both ends of the diagonal member body and are provided with diagonal member-side connecting parts that extend at a predetermined angle relative to the diagonal member body; and a space truss connecting member (13) having a connecting member-side fitting part on at least one side into which the slits of the string member-side connecting parts of string members (11a-11c) fit. The space truss connecting member (13) has a plurality of connecting member-side bolt holes through which bolts that are passed through the string member-side bolt holes of the string member-side connecting parts of string members (11a-11c) and the diagonal member-side bolt holes of the diagonal member-side connecting parts of diagonal members (12a, 12b) pass in the front-to-back direction.

Description

[Technical Field]

[0001] The present invention relates to a space truss structure constructed by three-dimensionally connecting chord members arranged in the vertical or horizontal direction and diagonal members arranged diagonally relative to the chord members via space truss connecting members. [Background technology]

[0002] In the field of steel frame structures and the like, a space truss structure has been proposed in which chord members, made of steel arranged in the vertical or horizontal direction, and diagonal members arranged diagonally relative to the chord members are connected in three dimensions via a space truss connecting member (see, for example, Patent Documents 1 and 2). In such a space truss structure, the space truss structure is usually constructed by connecting the chord member-side connecting parts provided at the ends of the upper and lower chord members and the diagonal member-side connecting parts provided at the ends of the diagonal members to the space truss connecting member with bolt joints at two locations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 56-135646 [Patent Document 2] Patent No. 5849320 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the space truss structures disclosed in the above-mentioned Patent Documents 1 and 2, in order to prevent rotation between the string members and diagonal members and the space truss connecting members, the string members and diagonal members are each bolted to the space truss connecting members at two locations using two sets of bolts and nuts, which creates the problem of time-consuming assembly work.

[0005] The present invention was made with a focus on these problems, and aims to provide a space truss structure that can improve workability by reducing the burden of inserting bolts and fastening nuts. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a space truss structure comprising: chord members each having a string member-side connecting portion at each end of the string member body, the string member-side connecting portion having a string member-side bolt hole and a string member-side fitting portion; diagonal members each having a diagonal member-side bolt hole at each end of the diagonal member body, the diagonal member-side connecting portion extending at a predetermined angle to the diagonal member body; and a space truss connecting plate each having a plurality of connecting member-side bolt holes through which bolts inserted into the string member-side bolt holes of the string member-side connecting portion of the string member or the diagonal member-side bolt holes of the diagonal member-side connecting portion of the diagonal member penetrate in the front-to-back direction; and a space truss connecting plate each having a string member-side fitting portion of the string member on one side thereof. and a space truss connecting member having a connecting member-side fitting portion into which a string member-side connecting portion of the string member fits, and on one side of the space truss connecting plate, the string member-side fitting portion of the string member-side connecting portion fits into the connecting member-side fitting portion, and bolts are passed through the string member-side bolt holes and the connecting member-side bolt holes and fastened with nuts to connect the string member-side connecting portion of the string member to the space truss connecting member, while on the other side of the space truss connecting plate, bolts are passed through the diagonal member-side bolt holes and the connecting member-side bolt holes and fastened with nuts to connect the diagonal member-side connecting portion of the diagonal member to the space truss connecting member. Furthermore, in the space truss structure of the present invention, the string member-side connecting portions of the string members are U-shaped slits, and the space truss connecting members have a plurality of connecting member-side bolt holes at a predetermined angle on a circumference of a predetermined radius relative to the center of the space truss connecting member, and the connecting member-side fitting portion is provided at the center of the space truss connecting member, and the connecting member-side fitting portion is configured as a cross-shaped fitting plate having the same thickness as the slit width of the slit portion extending from the center toward the connecting member-side bolt hole where the string member-side bolt hole of the string member-side connecting portion of the string member is connected with a bolt and nut. Furthermore, the space truss structure according to the present invention further comprises a column base member comprising: a column base connecting plate having a plurality of column base member-side bolt holes through which bolts passed through the string member-side bolt holes of the string member-side connecting parts of the string members or the diagonal member-side bolt holes of the diagonal member-side connecting parts of the diagonal members pass in the front-to-back direction, the column base connecting plate having a column base member-side fitting portion on one side into which the string member-side fitting portion of the string member-side connecting part of the string members fits; and a column base installation plate provided below the column base connecting plate and installed on the floor surface, On one side, the string member side fitting portion of the string member side connecting portion of the string member fits into the column base member side fitting portion, and bolts are passed through the string member side bolt holes and the column base member side bolt holes and fastened with nuts to connect the string member side connecting portion of the string member to the column base member, while on the other side of the column base connecting plate, bolts are passed through the inclined member side bolt holes and the column base member side bolt holes and fastened with nuts to connect the inclined member side connecting portion of the inclined member to the column base member. [Effects of the Invention]

[0007] In the space truss structure of the present invention, the space truss connecting member that connects the string members and diagonal members has a space truss connecting plate that has a plurality of connecting member bolt holes through which bolts that are passed through the string member bolt holes on the string member side or the diagonal member bolt holes on the diagonal member side pass in the front-to-back direction, and one surface of the space truss connecting plate is provided with a connecting member fitting portion into which the string member fitting portion of the string member's string member connecting portion fits. Therefore, in the space truss structure of the present invention, on one side of the space truss connecting plate, the string member side fitting portion of the string member side connecting portion of the string member fits into the connecting member side fitting portion, and bolts are passed through the string member side bolt holes and the connecting member side bolt holes and fastened with nuts to connect the string member side connecting portion of the string member to the space truss connecting member, while on the other side of the space truss connecting plate, bolts are passed through the diagonal member side bolt holes and the connecting member side bolt holes and fastened with nuts to connect the diagonal member side connecting portion of the diagonal member to the space truss connecting member, thereby forming the space truss structure. As a result, when connecting chord members that are arranged vertically or horizontally and mainly bear the stress of the space truss structure to space truss connecting members, they are fixed at two points: by the fit between the connecting member-side fitting portion of the space truss connecting member and the string member-side fitting portion of the string member-side connecting member, and by the bolt connection where a bolt is passed through the string member-side bolt hole and the connecting member-side bolt hole and fastened with a nut. This means that the space truss connecting member can be connected to the string members and diagonal members while reliably preventing rotation, and because one bolt connection point is required on each of the string members and diagonal members, assembly work can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a panel stand according to an embodiment of the present invention, which employs a space truss structure. [Figure 2] 1 is a front view of a panel stand according to an embodiment of the present invention, which employs a space truss structure. [Figure 3] 1 is a plan view of a panel stand according to an embodiment of the present invention, which employs a space truss structure. [Figure 4] FIG. 1 is a right side view of a panel stand according to an embodiment of the present invention, which employs a space truss structure. [Figure 5] FIG. 1 is a rear view of a panel stand according to an embodiment of the present invention, which employs a space truss structure. [Figure 6] 1A and 1B are a front view and a plan view, respectively, of a string member that constitutes a panel stand according to an embodiment of the present invention. [Figure 7]1A and 1B are a front view and a plan view, respectively, of a diagonal member that constitutes a panel stand according to an embodiment of the present invention. [Figure 8] FIG. 2 is a front view of a space truss connecting member that constitutes a panel stand according to an embodiment of the present invention. [Figure 9] 1A and 1B are a rear view and a bottom view, respectively, of a space truss connecting member that constitutes a panel stand according to an embodiment of the present invention. [Figure 10] 1A and 1B are a front view and a rear view, respectively, of a column base member constituting a panel stand according to an embodiment of the present invention. [Figure 11] 1A and 1B are a plan view and a side view, respectively, of a column base member that constitutes a panel stand according to an embodiment of the present invention. [Figure 12] FIG. 3 is an enlarged front view of a main part of part A in FIG. 2. [Figure 13] FIG. 3 is an enlarged rear view of a main part of part A in FIG. 2. [Figure 14] FIG. 3 is an enlarged front view of a main part of part B in FIG. 2. [Figure 15] FIG. 3 is an enlarged rear view of a main part of part B in FIG. 2. [Figure 16] FIG. 3 is an enlarged front view of a main part of part C in FIG. 2. [Figure 17] FIG. 3 is an enlarged rear view of a main part of part C in FIG. 2. [Figure 18] 3 is an enlarged front view of a main part of part D in FIG. 2. FIG. [Figure 19] 3 is an enlarged rear view of a main part of part D in FIG. 2. FIG. [Figure 20] 1A and 1B are a perspective view and a front view, respectively, showing another example of a string member-side fitting portion of a string member-side connecting portion of a string member that constitutes a space truss structure according to the present invention, and another example of a connecting member-side fitting portion of a connecting member, and the fitting state thereof. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of a panel stand 1 employing a space truss structure according to the present invention will be described in detail below with reference to the accompanying drawings. Note that the panel stand 1 of the embodiment described below is merely one example of the present invention, and the present invention is not limited to the embodiment described below, but can be modified as appropriate within the scope of the technical concept of the present invention.

[0010] <Configuration of the panel stand 1 of the embodiment employing a space truss structure> As shown in Figures 1 to 5, a panel stand 1 according to an embodiment of the present invention employs a space truss structure and is configured with chord members 11a to 11c of three different lengths, diagonal members 12a and 12b of two different lengths, a space truss connecting member 13, a column base member 14, and bolts 16a and nuts 16b that connect these members, and projects a projector image from a projector (not shown) onto a projector image projection board (not shown) installed on the panel stand 1.

[0011] (string members 11a~11c) The chord members 11a to 11c are connected perpendicular to each other via the space truss connecting members 13 and are mainly responsible for bearing the stress of the space truss structure. In the panel stand 1 of the embodiment employing the space truss structure of the present invention, the chord members are arranged horizontally or vertically.

[0012] As shown in Figures 6(a) and 6(b), each string member 11a is composed of a rod-shaped string member body 11a1 and a string member-side connecting portion 11a2, which has string member-side bolt holes 11a21 and slits 11a2 of a predetermined width at both ends of the string member body 11a1.

[0013] The string member body 11a1 is a hollow member composed of a hollow metal member such as a pipe made of a lightweight metal such as aluminum or titanium, and mounting plates 11a3, 11a3 are welded to both ends of the body for attaching the string member side connecting part 11a2.

[0014] 6(a) and 6(b), the string member-side connecting portion 11a2 is a metal plate-like member that is inserted into and welded to circular mounting plates 11a3 provided at both ends of the string member main body 11a1, and is provided with chord member-side bolt holes 11a21 into which bolts 16a are inserted, and slits 11a22 with a width α the same as the thickness α of a connecting member-side fitting plate 13b1 (described later) of the space truss connecting member 13 (see FIG. 8) and the thickness α of the column member-side fitting plate portion 14b of the column base member 14 (see FIG. 10). In FIGS. 6(a) and 6(b), the shaded areas indicate welded portions.

[0015] The string members 11b and 11c are constructed in the same manner as the string member 11a, having string member bodies 11b1 and 11c1 and string member-side connecting portions 11b2 and 11c2 provided on both sides of the string member bodies 11b1 and 11c1, with the only difference being that the lengths of the string member bodies 11b1 and 11c1 are different from the length of the string member body 11a1 of the string member 11a.

[0016] (Diagonal members 12a, 12b) The diagonal members 12a and 12b are members that are connected in an inclined state to the chord members 11a to 11c via the space truss connecting member 13, and are members that mainly have the function of maintaining the space truss structure.

[0017] As shown in Figures 7(a) and (b), the diagonal member 12a is composed of a rod-shaped diagonal member main body 12a1, which is made of a hollow metal member such as a pipe made of a lightweight metal such as aluminum or titanium, similar to the chord members 11a to 11c, and diagonal member side connecting portions 12a2 provided at both ends of the diagonal member main body 12a1.

[0018] Since the diagonal member 12a is installed at a predetermined angle β with respect to the chord members 11a to 11c to maintain the space truss structure, the diagonal-member-side connecting portions 12a2 on both sides of the diagonal-member main body 12a1 are bent at the predetermined angle β with respect to the diagonal-member main body 12a1, as shown in Figure 7(b) and other figures. The diagonal-member-side bolt hole 12a21 is provided at one location in the bent portion at the predetermined angle β, but the slits 11a22 to 11c22 of the chord-member-side connecting portions 11a2 to 11c2 of the chord members 11a to 11c are not provided. The shaded areas in Figures 7(a) and 7(b) indicate welded portions.

[0019] Furthermore, the diagonal member 12b is configured in the same manner as the diagonal member 12a, and has a diagonal member main body 12b1 and diagonal member side connecting portions 12b2 provided on both sides of the diagonal member main body 12b1, with the only difference being that the length of the diagonal member main body 12b1 is different from the length of the diagonal member main body 12a1 of the diagonal member 12a.

[0020] (Space truss connecting member 13) As shown in Figures 8, 9(a), and 9(b), etc., the space truss connecting member 13 has eight connecting-member-side bolt holes 13a1 for passing bolts 16a (see Figure 12, etc.) and a disk-shaped space truss connecting plate 13a arranged at a predetermined angle as will be described later, and a connecting-member-side fitting cross portion 13b that is located on one surface, the chord member connecting surface 13a3, of the space truss connecting plate 13a and protrudes more than the other surface, the diagonal member connecting surface 13a4, and that serves as a connecting-member-side fitting portion into which slit portions 11a22 to 11c22, which are string-member-side fitting portions of string-member-side connecting portions 11a2 to 11c2 of string members 11a to 11c, fit.

[0021] Here, as shown in Figures 8 and 9(a), of the eight connecting member side bolt holes 13a1, four of the eight connecting member side bolt holes 13a1 are arranged at 90 degree intervals in the vertical and horizontal directions, and the remaining four are arranged at an angle of approximately 50 degrees relative to the connecting member side bolt holes 13a1, 13a1 positioned horizontally in Figures 8 and 9(a), that is, at an angle of approximately 40 degrees relative to the connecting member side bolt holes 13a1, 13a1 positioned in the up-down direction (vertical direction).

[0022] Furthermore, a cross-shaped opening (not shown) is provided in the center of connecting plate 13a for the space truss, and two connecting member side fitting plates 13b1, 13b1 with a thickness α are arranged in a cross shape in this cross-shaped opening (not shown) to form connecting member side fitting cross portion 13b, which is arranged so as to protrude significantly toward chord member connecting surface 13a3.

[0023] One surface of space truss connecting plate 13a is chord member connecting surface 13a3, which is the surface to which string members 11a to 11c are connected, as shown in, for example, Figures 12, 15, and 16 described below. Slit portions 11a22 to 11c22 of string member-side connecting portions 11a2 to 11c2 of string members 11a to 11c are fitted into connecting member-side fitting cross portion 13b, and bolts 16a are passed through string member-side bolt holes 11a21, etc. and connecting member-side bolt holes 13a1 and fastened with nuts 16b, connecting string member-side connecting portions 11a2 to 11c2 of string members 11a to 11c to space truss connecting member 13.

[0024] The other surface of the space truss connecting plate 13a, i.e., the diagonal member connecting surface 13a4, is the surface where bolts 16a are passed through the diagonal member-side bolt holes 12a21 of the diagonal members 12a and 12b and the connecting member-side bolt holes 13a1, and fastened with nuts 16b to connect the diagonal member-side connecting parts 12a2 and 12b2 of the diagonal members 12a and 12b to the space truss connecting member 13, as shown in Figures 13, 14, and 17, which will be described later.

[0025] As shown in Figures 8 and 9(a) and (b), connecting member-side fitting cross section 13b is a component that fits into a cross-shaped opening (not shown) in space truss connecting plate 13a of the same shape as connecting member-side fitting cross section 13b, and protrudes significantly toward chord member connecting surface 13a3 of space truss connecting plate 13a. The rear end protrudes a few millimeters from diagonal member connecting surface 13a4 of space truss connecting plate 13a for welding, and is welded to diagonal member connecting surface 13a4 to be integrated with space truss connecting plate 13a.

[0026] Therefore, the welded portion WP1 between the space truss connecting plate 13a and the connecting member side fitting cross portion 13b appears only on the diagonal member connecting surface 13a4 side of the space truss connecting plate 13a as shown in Figures 9(a) and (b), and does not appear on the chord member connecting surface 13a3 side of the space truss connecting plate 13a as shown in Figure 8.

[0027] (Column base member 14) The column base member 14 is configured as shown in Figures 10 and 11, and includes a column base connecting plate 14a to which the chord member 11c and the two diagonal members 12b are connected, a column base member-side fitting plate portion 14b into which the slit portion 11c22 of the chord member-side connecting portion 11c2 of the chord member 11c fits, similar to the connecting member-side fitting cross portion 13b of the space truss connecting member 13, a column base reinforcing plate 14c that crosses the column base connecting plate 14a to reinforce the column base connecting plate 14a, and a column base installation plate 14d to which the lower ends of the column base connecting plate 14a and the column base reinforcing plate 14c are fixed by welding and which is placed on the floor.

[0028] As shown in Figures 10 and 11, the column base connecting plate 14a is composed of a column base connecting portion 14a1 that is circular in front view and has three column base member side bolt holes 14a11, for example, spaced at approximately 40 degree intervals, and a column base portion 14a2 that is rectangular in front view and is provided at the bottom of the column base connecting portion 14a1 and extends toward the column base installation plate 14d, and the column base portion 14a2 is provided with a support plate slit portion (not shown) into which the column base reinforcing plate 14c fits.

[0029] Like the space truss connecting member 13, the column base member 14 also has a chord member connecting surface 14a3 shown in Figure 10(a) to which the chord member 11c is connected, and a diagonal member connecting surface 14a4 shown in Figure 10(b) to which the two diagonal members 12b are connected, and as shown in Figures 11(a) and (b), the column base member side fitting plate portion 14b protrudes significantly on the chord member connecting surface 14a3 side and is configured to be welded to the column base member 14 on the diagonal member connecting surface 14a4 side.

[0030] 10 and 11, the column base member-side fitting plate portion 14b is a rectangular member in front view that fits into a rectangular opening (not shown) provided below the central column base member-side bolt hole 14a11 of the three column base member-side bolt holes 14a11 in the column base connecting portion 14a1, and is welded to the column base connecting plate 14a on the diagonal member connecting surface 14a4 side with the column base connecting plate 14a protruding significantly toward the chord member connecting surface 14a3. The welded portion between the column base connecting plate 14a and the column base member-side fitting plate portion 14b on the diagonal member connecting surface 14a4 side is designated as WP2.

[0031] The column base reinforcing plate 14c has a column base slit portion (not shown) into which the column base portion 14a2 of the column base connecting plate 14a fits, and by fitting into the column base slit portion (not shown), it is at an angle perpendicular to the column base connecting plate 14a, and is welded on both the chord member connecting surface 14a3 side and the diagonal member connecting surface 14a4 side of the column base connecting plate 14a.

[0032] As described above, the column base installation plate 14d is a plate-like member to which the lower ends of the column base connecting plate 14a and the column base reinforcing plate 14c are fixed by welding. Note that the welded portion between the column base installation plate 14d and the column base connecting plate 14a and the column base reinforcing plate 14c is designated as WP3.

[0033] A panel such as a projector image projection board (not shown) extends at a predetermined interval in the up-down (vertical) or left-right direction on the front side of the panel stand 1 of this embodiment, and is attached to the panel stand 1 of this embodiment using fixing members such as U-bolts, bolts 16a, and nuts 16b (not shown) to string members 11a and 11b, which are connected in a rectangular shape by a plurality of space truss connecting members 13 according to the size of the panel, etc.

[0034] <Configuration of the panel stand 1 of the embodiment employing a space truss structure> Next, the panel stand 1 is constructed using the three lengths of chord members 11a to 11c configured as described above, the two lengths of diagonal members 12a, 12b, the space truss connecting member 13, the column base member 14, and bolts 16a and nuts 16b that connect these together, etc., to form a space truss structure connected as shown in Figures 1 to 5.

[0035] Here, in the panel stand 1 of this embodiment that employs a space truss structure, five shortest chord members 11a, eleven next shortest chord members 11b, and two longest chord members 11c are prepared as shown in Figures 1 to 5. Also, fourteen space truss connecting members 13 and two column base members 14 are prepared.

[0036] In the panel stand 1 of this embodiment, as shown in Figures 1 to 5, the shortest chord members 11a are installed facing up and down (vertical direction), so five of them are lined up horizontally at intervals approximately the length of chord member 11b, the next shortest chord members 11b are installed facing horizontally, so eleven of them are lined up in three rows in the up and down direction (vertical direction), and two of the longest chord members 11c are lined up horizontally at intervals the length of chord member 11b, facing vertically, and these are connected by 14 space truss connecting members 13 and two column base members 14 and fastened with bolts 16a and nuts 16b to form a space truss structure.

[0037] (Node A) Here, for example, node A on the top row, which is the first row from the top in Fig. 2, is a contact point located forward of node B on the second row from the top and node D on the fourth row from the top of the space truss structure, as shown in Fig. 4, etc. Also, as shown in Fig. 12, etc., chord member connecting surface 13a3 of space truss connecting plate 13a of space truss connecting member 13 faces forward, and one string member 11a arranged vertically on the side of string member connecting surface 13a3 is connected to one string member 11b arranged horizontally at string member connecting surface 13a3.

[0038] Specifically, at the string member connecting surface 13a3, which is the front side of node A, as shown in FIG. 12 and other figures, the string member-side connecting portions 11a2, 11b2 of string member 11a and string member 11b respectively have their slits 11a22, 11b22 fitted into connecting member-side fitting plates 13b1, 13b1 of the connecting member-side fitting cross portion 13b that protrudes toward the string member connecting surface 13a3, and then their string member-side bolt holes 11a21, etc. (see FIG. 6) are connected by bolts 16a and nuts 16b via the connecting member-side bolt holes 13a1.

[0039] On the other hand, at the diagonal member connecting surface 13a4, which is the back side of node A, as shown in Figure 13, etc., the diagonal member side bolt hole 12a21 (see Figure 7) of the diagonal member connecting portion 12a2 of one diagonal member 12a is connected by a bolt 16a and a nut 16b via the connecting member side bolt hole 13a1 at the diagonal member connecting surface 13a4.

[0040] Therefore, vertical chord member 11a and horizontal chord member 11b, which mainly bear stress at contact point A of panel stand 1 employing a space truss structure, are each fixed at two points by a set of bolt 16a and nut 16b and by the engagement of slits 11a22, 11b22 with connecting member-side fitting cross section 13b. This means that string members 11a, 11b, and diagonal member 12a can be connected while rotation of space truss connecting member 13 at node A is reliably prevented, and diagonal member 12a is also fixed to space truss connecting member 13 by a set of bolt 16a and nut 16b, which reduces the number of bolt connection points by one for each of chord members 11a, 11b, and diagonal member 12a, improving assembly workability. At this contact point A, as shown in Figures 12 and 13, the bolt 16a is inserted from both the chord member connecting surface 13a3 and the diagonal member connecting surface 13a4. However, as shown at contact point B, which will be described next, it is also possible to insert the bolt 16a only from the chord member connecting surface 13a3 side, or only from the diagonal member connecting surface 13a4 side.

[0041] (Node B) Next, node B, which is the second row from the top in Fig. 2, is a contact point located closer to the back surface than node A on the first row and contact point C on the third row, as shown in Fig. 4, and diagonal member connecting surface 13a4 of space truss connecting member 13 shown in Fig. 14 faces the front, connecting four diagonal members 12a at diagonal member connecting surface 13a4. At node B, chord member connecting surface 13a3 of space truss connecting member 13 shown in Fig. 15 faces the back surface, connecting one horizontally installed chord member 11b and one vertically installed chord member 11c.

[0042] That is, on the diagonal member connecting surface 13a4 of the space truss connecting member 13, the four diagonal members 12a are connected by bolts 16a and nuts 16b via the four connecting member-side bolt holes 13a1, as shown in FIG.

[0043] On the other hand, on the chord member connecting surface 13a3 of the space truss connecting member 13, as shown in FIG. 15, the string member-side connecting portions 11b2, 11c2 of the string members 11b and 11c, respectively, are fitted into the connecting member-side fitting plates 13b1, 13b1 of the connecting member-side fitting cross portion 13b that protrudes toward the string member connecting surface 13a3, and then connected by the bolts 16a and nuts 16b through the connecting member-side bolt holes 13a1.

[0044] Therefore, horizontal chord member 11b and vertical chord member 11c, which mainly bear the stress at contact point B of panel stand 1 employing a space truss structure, are each fixed at two points by a set of bolt 16a and nut 16b, and by the engagement of slits 11b22, 11c22 with connecting member side fitting cross portion 13b. Therefore, string members 11b, 11c and four diagonal members 12a can be connected while rotation of space truss connecting member 13 at node B is reliably prevented, and diagonal member 12a is also fixed to space truss connecting member 13 by a set of bolt 16a and nut 16b. This reduces the number of bolt connection points by one for each of chord members 11b, 11c and diagonal member 12a, improving assembly workability. At this point of contact B, as shown in Figures 14 and 15, the bolt 16a is inserted only from the chord member connecting surface 13a3 and fastened with the nut 16b only on the diagonal member connecting surface 13a4. However, as shown in Figures 14 and 15, the bolt 16a may also be inserted from both the chord member connecting surface 13a3 and the diagonal member connecting surface 13a4.

[0045] (Node C) Next, node C, which is the third row from the top in Figure 2, is a contact point that, like node A on the first row as shown in Figure 4, is located forward of node B on the second row of the space truss structure and contact point D on the fourth row. As shown in Figures 16 and 17, the string member-side connecting portions 11a2, 11b2 of one chord member 11a extending in the vertical direction and two string members 11b extending in the horizontal direction are fitted into connecting member-side fitting plates 13b1, 13b1 of connecting member-side fitting cross portion 13b that protrudes toward string member connecting surface 13a3, with their respective slits 11a22, 11b22 fitted into bolt-side bolt holes 13a1 of space truss connecting member 13 passed through bolts 16a and nuts 16b.

[0046] On the other hand, at the diagonal member connecting surface 13a4 on the back side of node C, as shown in Figure 17, the diagonal member connecting portions 12a2 and 12b2 of the two diagonal members 12a and one diagonal member 12b are connected at the diagonal member connecting surface 13a4 by bolts 16a and nuts 16b via the connecting member side bolt holes 13a1.

[0047] Therefore, at joint C of panel stand 1 employing a space truss structure, vertical chord member 11a and horizontal chord member 11b, which mainly bear the stress, are each fixed at two points by a set of bolt 16a and nut 16b, and by the engagement of slits 11a22, 11b22 with connecting member-side fitting cross section 13b. This ensures that string member 11a and two chord members 11b, two diagonal members 12a and one diagonal member 12b are connected together while reliably preventing rotation of space truss connecting member 13 at joint C. Furthermore, diagonal members 12a and 12b are each fixed to space truss connecting member 13 by a set of bolt 16a and nut 16b, which reduces the number of bolt connections by one for each of chord members 11a, 11b and diagonal members 12a, 12b, improving assembly workability. In this contact point C, as shown in Figures 16 and 17, the bolt 16a is inserted from both the chord member connecting surface 13a3 and the diagonal member connecting surface 13a4. However, as shown in Figures 16 and 17, it is also possible to insert the bolt only from the chord member connecting surface 13a3, as in the case of contact point B described above, or to insert the bolt only from the diagonal member connecting surface 13a4.

[0048] (Node D) Finally, contact point D, which is the fourth row from the top and the lowest row, is a contact point that, like node B, which is the second row from the top, is located behind node A in the first row and contact point C in the third row, as shown in Figure 4.As shown in Figure 18, the inclined member connecting surface 14a4 of the column base member 14 faces forward, and is connected at the inclined member connecting surface 14a4 to the inclined member side bolt holes (not shown) of the inclined member side connecting portions 12b2 of each of the two inclined members 12b and to the two column base member side bolt holes 14a11 of the column base member 14 by nuts 16b through bolts 16a.

[0049] On the other hand, at the chord member connecting surface 14a3 of the column base member 14, as shown in FIG. 19, the slit portion 11c22 of the string member side connecting portion 11c2 of one string member 11c extending in the vertical direction is fitted into the column base member side fitting plate portion 14b protruding toward the string member connecting surface 14a3, and then the string member 11c is connected to the column base member side bolt hole (not shown) of the string member side connecting portion 11c2 of the string member 11c by passing a bolt 16a through the column base member side bolt hole 14a11 and a nut 16b.

[0050] Therefore, at contact point D of panel stand 1 that employs a three-dimensional truss structure, vertical chord member 11c, which mainly bears stress, is fixed at two points by a set of bolt 16a and nut 16b and the engagement between slit portion 11c22 and column base member side fitting plate portion 14b, so that chord member 11c and two diagonal members 12b can be connected while reliably preventing rotation of column base member 14 that constitutes node D, and diagonal member 12b is also fixed to three-dimensional truss connecting member 13 by a set of bolt 16a and nut 16b, so that one bolt connection point is reduced in each of chord member 11c and diagonal member 12b, improving assembly workability. In this contact point D, as shown in Figures 18 and 19, the bolt 16a is inserted from both the chord member connecting surface 14a3 and the diagonal member connecting surface 14a4. However, as shown in Figures 18 and 19, it is also possible to insert the bolt only from the chord member connecting surface 14a3, as in the case of contact point B, or to insert the bolt only from the diagonal member connecting surface 14a4.

[0051] As described above, five string members 11a, 11 string members 11b, and two string members 11c are connected by 14 space truss connecting members 13, and the left and right legs are constructed with two column base members 14 to form a panel stand 1 with a space truss structure, on which an electronic blackboard, projector image projection board, etc. (not shown) can be attached.

[0052] <Summary of the panel stand 1 according to the embodiment employing the space truss structure of the present invention> As explained above, in the panel stand 1 employing the space truss structure according to the present invention, the space truss connecting member 13 connecting the string member-side connecting portions 11a2 to 11c2 of the string members 11a to 11c and the diagonal member-side connecting portions 12a2, 12b2 of the diagonal members 12a, 12b is provided with the connecting member-side bolt hole 13a1 through which the bolt 16a passes in the front-to-back direction, and on the string member connecting surface 13a3, which is one surface of the space truss connecting member 13, the connecting member-side fitting cross portion 13b is fitted into the slit portions 11a22 to 11c22 of the string member-side connecting portions 11a2 to 11c2 of the string members 11a to 11c. Bolts 16a are passed through member-side bolt holes 11a21, etc. and connecting member-side bolt holes 13a1 and fastened with nuts 16b to connect chord member-side connecting portions 11a2-11c2 of chord members 11a-11c to space truss connecting member 13. On the other hand, on the other surface of space truss connecting member 13, which is diagonal member connecting surface 13a4, bolts 16a are passed through diagonal member-side bolt holes 12a21, etc. of diagonal member-side connecting portions 12a2, 12b2 and space truss connecting member 13, and fastened with nuts 16b to connect diagonal member-side connecting portions 12a2, 12b2 of diagonal members 12a, 12b to space truss connecting member 13.

[0053] Therefore, in conventional space truss structures, when connecting string members to space truss connecting members, the string members are often connected to the space truss connecting members by two bolt joints using two sets of bolts and nuts to prevent rotation between the string members and the space truss connecting members. However, in panel stand 1 employing the space truss structure of the present invention, string members 11a-11c, which mainly bear the stress, and space truss connecting member 13 are connected by fitting slits 11a22-11c22 of string member connecting portions 11a2-11c2 into connecting member mating cross portion 13b, and by a single bolt joint between string member bolt hole 11a21 etc. and connecting member bolt hole 13a1. This prevents rotation of space truss connecting member 13 and improves assembly workability by reducing the number of bolt joints by one on each of string members 11a-11c and diagonal members 12a, 12b.

[0054] Furthermore, in panel stand 1 employing the space truss structure of the present invention, the axial directions of bolts 16a that secure string-member-side connecting portions 11a2-11c2 of chord members 11a-11c and bolts 16a that secure diagonal-member-side connecting portions 12a2, 12b2 of diagonal members 12a, 12b in space truss connecting member 13 each face in one direction toward the front or back of space truss connecting member 13 and do not face in other directions such as diagonal or perpendicular directions. This reduces the burden of inserting bolts 16a and fastening nuts 16b, thereby improving workability in this respect as well.

[0055] Furthermore, in panel stand 1 employing the space truss structure of the present invention, space truss connecting member 13 has a plurality of connecting member-side bolt holes 13a1 formed at a predetermined angle on a circumference of a predetermined radius relative to the center of space truss connecting plate 13a, and connecting member-side fitting cross portion 13b is formed at the center of space truss connecting member 13, and connecting member-side fitting cross portion 13b extends from the center toward connecting member-side bolt hole 13a1, where string member-side bolt holes 11a21 of string member-side connecting portions 11a2-11c2 of string members 11a-11c are connected by bolts 16a and nuts 16b, and fitting plate members 13b1, 13b1 having the same thickness as the plate thickness of slit portions 11a22-11c22 are provided to intersect in a cross shape.

[0056] Therefore, in panel stand 1 employing the space truss structure of the present invention, slits 11a22-11c22 of string-member-side connecting sections 11a2-11c2 of chord members 11a, 11c installed in the up-down (vertical) direction and chord member 11b installed in the horizontal direction, which primarily bear stress, fit into cross-shaped connecting-member-side fitting cross section 13b of space truss connecting member 13, enabling easy and reliable perpendicular connection of string members 11a, 11c installed in the up-down (vertical) direction and chord member 11b installed in the horizontal direction, thereby improving assembly efficiency of panel stand 1 and improving the stability and strength of the entire panel stand 1. Of course, the widths of slits 11a22-11c22 may be slightly increased to facilitate easier fitting.

[0057] Furthermore, the panel stand 1 employing the space truss structure according to the present invention further comprises a column base member 14 including: a column base connecting plate 14a provided with a plurality of column base member-side bolt holes 14a11 through which bolts 16a, which are passed through the chord member-side bolt holes (not shown) of the chord member-side connecting portion 11c2 of the chord member 11c or the diagonal member-side bolt holes (not shown) of the diagonal member-side connecting portion 12b2 of the diagonal member 12b, penetrate in the front-to-back direction; a column base member-side fitting plate portion 14b protruding toward the chord member connecting surface 14a3 of the column base connecting plate 14a and into which the slit portion 11c22 of the chord member-side connecting portion 11c2 of the chord member 11c is fitted; a column base reinforcing plate 14c intersecting the column base connecting plate 14a; and a column base installation plate 14d provided below the column base connecting plate 14a and installed on the floor surface. On the chord member connecting surface 14a3, which is one surface of the column base connecting plate 14a, the slit portion 11c22 of the chord member side connecting portion 11c2 of the chord member 11c is fitted into the column base member side fitting plate portion 14b, and a bolt 16a is passed through the chord member side bolt hole (not shown) of the string member side connecting portion 11c2 of the chord member 11c and the column base member side bolt hole 14a11 and fastened with a nut 16b, thereby connecting the chord member side connecting portion 11c2 of the chord member 11c to the column base member 14. On the other hand, on the diagonal member connecting surface 14a4, which is the other surface of the column base connecting plate 14a, the bolt 16a is passed through the diagonal member side bolt hole (not shown) of the diagonal member side connecting portion 12b2 of the diagonal member 12b and the column base member side bolt hole 14a11 and fastened with a nut 16b, thereby connecting the diagonal member side connecting portion 12b2 of the diagonal member 12b to the column base member 14.

[0058] Therefore, in the panel stand 1 employing the space truss structure of the present invention, in the column base member 14 installed on the floor surface or the like, just like the space truss connecting member 13, the chord member 11c and the column base member 14, which mainly bear the stress, can be connected by fitting the slit portion 11c22 of the string member side connecting portion 11c2 into the column base member side fitting plate portion 14b and by bolting at one point between the string member side bolt hole (not shown) and the column base member side bolt hole 14a11, while preventing rotation between the chord member 11c and the column base member 14, thereby reducing the number of bolt joints and improving workability.

[0059] Furthermore, in the column base member 14 installed on the floor surface or the like, similarly to the space truss connecting member 13, the axial directions of the bolt 16a that secures the chord member side connecting portion 11c2 of the chord member 11c and the bolt 16a that secures the diagonal member side connecting portion 12b2 of the diagonal member 12b in the column base member 14 each face in one direction toward the front or back of the column base member 14 and do not face in other directions such as diagonal or perpendicular directions, thereby reducing the burden of inserting the bolt 16a and fastening with the nut 16b, thereby improving workability in this respect as well.

[0060] In the above embodiment, the connecting member side fitting cross portion 13b and the column base member side fitting plate portion 14b of the space truss connecting member 13 and the column base connecting plate 14a of the column base member 14 are configured to protrude significantly toward the chord member connecting surfaces 13a3, 14a3, and to protrude only slightly toward the diagonal member connecting surfaces 13a4, 14a4 for welding. However, the present invention is not limited to this, and it is of course also possible to configure the diagonal member connecting surfaces 13a4, 14a4 to protrude equally toward the chord member connecting surfaces 13a3, 14a3.

[0061] Furthermore, in the panel stand 1 employing the space truss structure of the present invention, the space truss connecting plate 13a of the space truss connecting member 13 is provided with a cross-shaped connecting member-side fitting cross portion 13b, but this invention is not limited to this, and it goes without saying that the connecting member-side fitting portion can be provided in a shape other than a cross, for example, a Y-shape inclined at 120 degrees, depending on the connection angle of the chord members that make up the space truss structure. In this way, by changing the shape of the connecting member-side fitting portion depending on the connection angle of the string members, it becomes easier to set the string members horizontal, vertical, or at any angle, and they can easily be set to a square or any other angle. 20(a) and 20(b), a cylindrical or columnar fitting protrusion 13b' is provided as a fitting portion on the connecting member side by, for example, pushing out from the diagonal member connecting surface side, which is the back side, of the space truss connecting plate 13a' of the space truss connecting member 13' from the diagonal member connecting surface side, or by welding a pin to the string member connecting surface 13a3' side. On the other hand, string member side bolt holes 11a21', 11b2' are provided in the string member side connecting portions 11a2', 11b2'. Alternatively, although not shown, it is also possible to provide fitting holes as connecting member fittings on the string member connecting surface 13a3' of space truss connecting plate 13a' of space truss connecting member 13', while providing fitting protrusions on string member connecting portions 11a2', 11b2' on the string member side that fit into fitting holes on space truss connecting plate 13a'. Note that in Figures 20(a) and 20(b), the string member bodies of the string members are omitted, and only the string member connecting portions 11a2', 11b2' are shown as an example.

[0062] Furthermore, in the above description of the embodiment, the string member bodies of the string members and the diagonal member bodies of the diagonal members that make up the space truss structure according to the present invention have been described using as an example string member bodies 11a1-11c1 and diagonal member bodies 12a1, 12b1 formed from hollow metal members such as aluminum. However, the present invention is not limited to this, and solid metal members or wood materials may be used as the string member bodies of the string members and the diagonal member bodies of the diagonal members, or it may also be applied to a space truss structure in which string members and diagonal members are made from hybrid materials of metal members and wood materials.

[0063] Furthermore, in the above embodiment, the space truss structure according to the present invention has been described as being applied to a projector image projection board for projecting images from a projector or a panel stand 1 for mounting a large, thin monitor. However, the present invention is not limited to this, and the space truss structure according to the present invention described above may of course be applied to, for example, a panel stand for mounting solar panels, or even space truss structures other than panel stands, such as the framework of a dome-shaped building or the skeletal structure (framework) of the attic structure of a medium- to large-scale wooden building, the skeletal structure (framework) of a steel-framed or wooden building, or a mixed structure building that combines wooden and non-wooden construction, or even space truss structures for various structures other than buildings, such as bridges. [Explanation of symbols]

[0064] 1 panel stand 11a,11b,11c String members 11a1, 11b1, 11c1 String member body 11a2,11b2,11c2,11a2',11b2' String member side connection part 11a21 String member side bolt hole 11a22, 11b22, 11c22 Slit section (string member side fitting section) 11a22',11b22' String member side fitting hole (string member side fitting part) 12a,12b Diagonal member 12a1,12b1 Diagonal member body 12a2,12b2 Diagonal member side connection part 12a21 Diagonal member bolt hole 13,13' Space truss connecting member 13a Connecting plate for space truss 13a1, 13a1' Connecting member side bolt hole 13a3,13a3' String member connection surface 13a4 Diagonal member connection surface 13b Connecting member side fitting cross portion (connecting member side fitting portion) 13b' connecting member side fitting convex portion (connecting member side fitting portion) 13b1,13b1 Connection member side fitting plate 14 Column base member 14a Connecting plate for column base 14a1 Column base connection 14a11 Column base member side bolt hole 14a2 Column base 14b Column base member side fitting plate portion (column base member side fitting portion) 14c Reinforcement plate for column base 14d Installation plate for column base 16a bolt 16b Nut

Claims

1. a string member having a string member-side connecting portion provided at each end of the string member body, the string member-side connecting portion having a string member-side bolt hole and a string member-side fitting portion; a diagonal member having a diagonal member-side bolt hole at each end of a diagonal member body and a diagonal member-side connecting portion extending at a predetermined angle with respect to the diagonal member body; a space truss connecting member having a connecting plate for a space truss in which a plurality of connecting member-side bolt holes are provided, through which bolts that are passed through the string member-side bolt holes of the string member-side connecting parts of the string members or the diagonal member-side bolt holes of the diagonal member-side connecting parts of the diagonal members pass in the front-to-back direction, and a connecting member-side fitting portion is provided on one surface of the connecting plate for a space truss, into which the string member-side fitting portion of the string member-side connecting part of the string member is fitted, On one surface of the space truss connecting plate, the string member-side fitting portion of the string member-side connecting portion of the string member fits into the connecting member-side fitting portion, and bolts are passed through the string member-side bolt holes and the connecting member-side bolt holes and fastened with nuts to connect the string member-side connecting portion of the string member and the space truss connecting member, On the other side of the connecting plate for the space truss, bolts are passed through the diagonal member-side bolt holes and the connecting member-side bolt holes and fastened with nuts to connect the diagonal member-side connecting part of the diagonal member to the space truss connecting member, thereby forming a space truss structure.

2. The space truss structure according to claim 1, the string member-side connecting portion of the string member is a U-shaped slit portion, The space truss connecting member is a plurality of connecting member-side bolt holes are provided at a predetermined angle on a circumference of a predetermined radius relative to the center of the space truss connecting member, and the connecting member-side fitting portion is provided at the center of the space truss connecting member; a space truss structure characterized in that the connecting member side fitting portion is configured in a cross shape using a fitting plate having the same thickness as the slit width of the slit portion extending from the center toward the connecting member side bolt hole where the string member side bolt hole of the string member side connecting portion of the string member is connected with a bolt and nut.

3. The space truss structure according to claim 1, moreover, a column base member including: a column base connecting plate having a plurality of column base member-side bolt holes through which bolts passed through the string member-side bolt holes of the string member-side connecting parts of the string members or the diagonal member-side bolt holes of the diagonal member-side connecting parts of the diagonal members pass in the front-to-back direction; and a column base installation plate provided below the column base connecting plate and installed on the floor surface, On one surface of the column base connecting plate, the string member side fitting portion of the string member side connecting portion of the string member fits into the column base member side fitting portion, and bolts are passed through the string member side bolt holes and the column base member side bolt holes and fastened with nuts to connect the string member side connecting portion of the string member and the column base member, A three-dimensional truss structure characterized in that on the other side of the column base connecting plate, bolts are passed through the inclined member side bolt holes and the column base member side bolt holes and fastened with nuts to connect the inclined member side connecting portion of the inclined member to the column base member.

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