JP2012202175A - Skeletal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skeletal structure capable of having a state close to rigid joining easily.SOLUTION: A skeletal structure F is constituted by combining a chord material 1A made of aluminum alloy and a lattice material 3A together, the chord material 1A has a chord-side knurl part 1a formed by arranging a plurality of first protrusive ridges side by side, and the chord-side knurl part 1a is formed when an extrusion shape material on which the chord material 1A is based is molded by extrusion. The lattice material 3A has a lattice-side knurl part 3a formed by arranging a plurality of second protrusive ridges side by side, and the lattice-side knurl part 3a is formed when an extrusion shape material on which the lattice material 3A is based is molded by extrusion. The chord-side knurl part 1a and lattice-side knurl part 3a are superposed at a join part between the chord material 1A and lattice material 3A, and the first protrusive ridges and second protrusive ridges are crushed at intersections of the first protrusive ridges and second protrusive ridges with fastening force of a bolt B penetrating the chord-side knurl part 1a and lattice-side knurl part 3a.

Description

  The present invention relates to a frame structure using an extruded shape made of an aluminum alloy.

  Patent Documents 1 to 3 disclose examples in which a chord material or lattice material (oblique material, vertical material) of a frame structure is formed of an extruded shape made of an aluminum alloy.

  In the frame structures of Patent Documents 1 and 2, the chord material and the lattice material are joined by ordinary bolts. Therefore, the force exchange at the joint portion of the chord material and the lattice material is via a shearing force acting on the ordinary bolts. Will be done.

  The frame structure of Patent Document 3 prevents the lattice material from moving in the direction perpendicular to the axis of the chord material by fitting the concave portion provided in the chord material with the convex portion provided at the end of the lattice material. . In addition, since the convex part of the lattice material is formed to be parallel to the extending direction of the concave part of the string material, the extending direction of the concave part is caulked before and after the convex part of the lattice material. The lattice material is prevented from moving to

Japanese Patent Laid-Open No. 11-200003 JP 2003-193620 A JP-A-9-125598

  Even in the case of designing assuming that the joints of the frame structure are pin joints, it is desirable that the joints be made close to rigid in the actual structure from the viewpoint of suppressing vibration and fatigue.

  In the frame structure of Patent Documents 1 and 2, if high-strength bolt friction welding is adopted at the joint (node) between the chord material and the lattice material, the node can be brought closer to rigidity, but in high-strength bolt friction welding, Since it is necessary to perform a rough surface treatment such as a blast treatment or a chemical treatment on the surface, there is a possibility that the rough surface treatment may require time and effort in a frame structure having many nodes.

  In the frame structure of Patent Document 3, the string material and the lattice material are joined only by “engagement of unevenness” and “caulking” without using bolts or welding, so that rigid joining is not achieved. , There is a risk of misalignment or rattling at the nodes.

  From such a viewpoint, the present invention aims to provide a framework structure using an extruded shape made of an aluminum alloy, which can easily obtain a state close to rigid joining. To do.

  The present invention that solves such a problem is a frame structure configured by combining a string material and a lattice material made of an aluminum alloy, and the string material includes a plurality of first protrusions arranged in parallel. The string side knurled portion is formed at the time of extrusion molding of the extruded shape member that is the element of the string material, and the lattice material includes a plurality of second protrusions arranged in parallel. The lattice-side knurl portion is formed at the time of extrusion molding of the extruded profile that is the element of the lattice material, and at the joint portion between the string material and the lattice material. The string-side knurled portion and the lattice-side knurled portion are overlapped, and the first and second ridges are fastened by a fastening force of a bolt passing through the string-side knurled portion and the lattice-side knurled portion. At the intersection with Characterized in that the first protrusion and the second protrusion has collapsed.

  According to the present invention, the first ridge of the chord-side knurl portion and the second ridge of the lattice-side knurl portion intersect diagonally or vertically at the nodes of the frame structure, and both ridges are crushed at the intersection. Thus, the frictional resistance between the string side knurled portion and the lattice side knurled portion can be increased, and as a result, the string material and the lattice material can be joined in a state close to rigid joining. The string material and the lattice material are made of an extruded shape made of an aluminum alloy, and each knurled portion is formed at the time of extrusion molding of the extruded shape, so that it is not necessary to perform a rough surface treatment such as a blast treatment. The bolt may be a normal bolt or a high-strength bolt.

  Although there is no restriction | limiting in the form of the said string material and the said lattice material, While providing the connection plate to which the said lattice material is connected to the said string material, a pair which opposes with a predetermined space | interval (space | interval which can insert the said connection plate) is opposed. The web is provided on the lattice material, the string side knurled portion is formed on each of both side surfaces of the connection plate, and the lattice side is formed on each of the inner surface of the one web and the inner surface of the other web. A knurled portion may be formed. In this way, the contact area between the string side knurled portion and the lattice side knurled portion is increased, so that the joining state of the string material and the lattice material can be brought close to a rigid joint.

  The height of the first ridge and the second ridge may be set as appropriate, but when the influence of the height of the ridge on the frictional resistance is examined by experiment, it is 1.0 mm or less, more preferably 0.5 mm. The knowledge that the following is desirable was obtained. It should be noted that at the joint between the chord material and the lattice material, it is preferable to deform the ridges and bring both members into contact with each other. However, if the height of the ridge exceeds 1 mm, the tension applied to the bolt may become too large. There is. Further, the processing for the die for extrusion molding is usually performed by electric discharge machining using a wire as an electrode, but when the die is processed by electric discharge machining, the lower limit value of the height of each protrusion is the wire If the height of the ridge is less than 0.2 mm, the difficulty of processing for the extrusion die increases, so the height of the first and second ridges is , 0.2 mm or more is desirable.

  In addition, there is no restriction | limiting in the use of the frame structure which concerns on this invention, In addition to a roof, it can apply to a wall body, a pillar, the support beam of stairs, a truss bridge, etc.

  According to the present invention, since the frictional resistance at the joint surface can be increased without subjecting the chord material and the lattice material to roughening, a state close to a rigid joint can be easily obtained.

(A) is sectional drawing which shows the state which cut | disconnected the frame structure which concerns on embodiment of this invention with the plane which makes the longitudinal direction of a chord material a normal line, (b) is an enlarged view of the X1 part of (a). is there. It is a YY arrow direction side view of FIG. It is a bottom view which shows only the member which comprises the lower layer of the frame structure which concerns on embodiment of this invention. (A) is an end view of the extruded profile that is the element of the upper chord material and the lower chord material, and (b) is an enlarged view of the X2 portion of (a). (A) is an end view of an extruded profile that is an element of an oblique material, and (b) is an enlarged view of a portion X3 in (a). It is an expansion perspective view which shows the edge part of a diagonal. It is a disassembled perspective view which shows a node part. It is sectional drawing of a node part. It is a graph which shows the result of a slip test.

  The frame structure F according to the embodiment of the present invention is a double layer type (multi-layer type) space frame, and as shown in FIG. 1 (a), the chord members 1A and 1B and the lattice members 2, 3A, This is a combination of 3B.

In the following description, of the chord members 1A and 1B, the chord member 1A disposed in the lower layer of the framework structure F is referred to as “lower chord member 1A”, and the chord member disposed in the upper layer of the framework structure F. 1B is referred to as “upper chord material 1B”.
Of the lattice materials 2, 3A, 3B, the one that connects the lower chord material 1A and the upper chord material 1B diagonally is referred to as "diagonal material 2", and the one that connects the lower chord materials 1A, 1A is referred to as "the lower horizontal material 3A". The upper chord members 1B and 1B are called “upper cross member 3B”.

  The frame structure F includes lower chord members 1A, 1A, ..., upper chord members 1B, 1B, ..., diagonal members 2, 2, ... that connect the lower chord member 1A and the upper chord member 1B, and adjacent lower chord members 1A, 1A. Are connected to the lower horizontal members 3A, 3A,..., And the upper horizontal members 3B, 3B,.

  The lower layer of the frame structure F is composed of a plurality of lower chord members 1A, 1A ... and a plurality of lower cross members 3A, 3A, ..., and the upper layer of the frame structure F is a plurality of upper chord members 1B, 1B. ,... And a plurality of upper cross members 3B, 3B,. Further, the upper layer and the lower layer of the frame structure F are connected by a plurality of diagonal members 2, 2,.

  Both the lower chord material 1A and the upper chord material 1B are arranged such that the longitudinal direction is the direction perpendicular to the paper surface of FIG.

  Adjacent lower chord members 1A, 1A are arranged side by side in the horizontal direction and are parallel in the present embodiment (see FIG. 3).

  In this embodiment, the upper chord material 1B is located obliquely above the lower chord material 1A and is parallel to the lower chord material 1A (see FIG. 2). Moreover, the adjacent upper chord materials 1B and 1B are arranged in parallel in the horizontal direction at intervals, and are parallel in this embodiment (not shown).

  As shown in FIG. 2, the diagonal member 2 is disposed in a plane including the lower chord material 1 </ b> A and the upper chord material 1 </ b> B, and obliquely intersects the lower chord material 1 </ b> A and the upper chord material 1 </ b> B with an angle θ. The plurality of diagonal members 2, 2,... In the construction surface are arranged in a zigzag shape and form a truss structure together with the lower chord member 1A and the upper chord member 1B.

  As shown in FIG. 3, a plurality of lower cross members 3A are arranged in a plane including the adjacent lower chord members 1A and 1A. In FIG. 3, the upper chord member 1, the diagonal member 2, and the upper cross member 3B are not shown. The lower cross member 3A includes an orthogonal type that intersects the lower chord material 1A perpendicularly and an oblique type that intersects the lower chord material 1A obliquely. In this embodiment, the orthogonal type lower cross member 3A and the oblique cross type lower cross member 3A are alternately arranged, and the truss structure is formed by the lower chord members 1A, 1A and the lower cross members 3A, 3A,. Has been.

  A plurality of upper cross members 3B shown in FIG. 1 are arranged in a plane including adjacent upper chord members 1B, 1B. Although not shown, the upper cross member 3B also includes an orthogonal type that intersects the upper chord member 1B perpendicularly and an oblique type that intersects the upper chord member 1B obliquely. A truss structure is formed by the material 3B.

Next, the configuration of each member described above will be described in detail.
Each of the lower chord material 1A and the upper chord material 1B includes a hollow portion having a hollow closed cross-sectional shape (substantially hexagonal in the present embodiment), first connection plates 16 and 16, and second connection plates 17 and 17. I have. As shown in FIGS. 1 to 3, the diagonal member 2 is connected to the first connection plate 16, and the lower horizontal member 3 </ b> A or the upper horizontal member 3 </ b> B is connected to the second connection plate 17.

  Each of the lower chord material 1A and the upper chord material 1B is composed of the first extruded shape member 10 shown in FIG. The direction of the extruded shape member 10 shown in FIG. 4A is assumed to be used as the lower chord material 1A. When used as the upper chord material 1B, the extruded shape member 10 shown in FIG.

  The first extruded profile 10 is an extruded profile made of an aluminum alloy and is continuous in the direction perpendicular to the plane of FIG. In the present embodiment, the hollow section has a substantially hexagonal (polygonal) cross-sectional shape, but may be changed to a circular or elliptical shape. Further, one extruded shape member 10 may be the lower chord material 1A or the upper chord material 1B, and a plurality of extruded shape members 10 connected in the longitudinal direction may be the lower chord material 1A or the upper chord material 1B.

  The hollow portion of the extruded shape member 10 includes stiffening portions 11 and 12 disposed so as to face each other, seat portions 13 and 13 disposed so as to face each other, and one stiffening portion 11 and the seat portion 13. , 13, and second thin portions 15, 15 linking the other stiffening portion 12 and the seat portions 13, 13.

  One stiffening portion 11 is arranged for the purpose of increasing the secondary moment of section of the hollow portion and relieving stress concentrated on the boundary portion between the hollow portion and the first connection plate 16. It is formed thicker than the thin portion 14. The stiffening portion 11 of the present embodiment is formed in a range including two adjacent corner portions, and connects the first connection plates 16 and 16 that are opposed to each other in the shape of a letter across the two corner portions. Yes.

  The other stiffening portion 12 is disposed for the purpose of increasing the secondary moment of section of the hollow portion, and is disposed so as to face one stiffening portion 11.

  The seat portion 13 is disposed for the purpose of relieving stress concentrated on the boundary portion between the hollow portion and the second connection plate 17, and is formed thicker than the thin portions 14 and 15.

  The 1st thin part 14 and the 2nd thin part 15 are formed so that the corner | angular part of a hollow part may be included. The first thin portion 14 has a cross-sectional shape, and the second thin portion 15 has an L-shape.

  The first connection plate 16 and the second connection plate 17 are both flat and project vertically from the outer surface of the hollow portion. The first connection plate 16 protrudes from the outer surface of the side edge of the stiffening portion 11, and the second connection plate 17 protrudes from the outer surface of the seat portion 13. A virtual plane Q passing through the center of the connection plates 16 and 17 in the thickness direction passes through a virtual axis P provided at the center of the hollow portion. That is, the connection plates 16 and 17 are formed so as to spread radially around the virtual axis P. The virtual axis P is a virtual line extending in the longitudinal direction of the hollow portion (the direction perpendicular to the paper surface of FIG. 4A), and in the present embodiment, is located near the centroid of the hollow portion. .

  Each of the first connection plate 16 and the second connection plate 17 includes a string side knurled portion 1a. As shown in FIG. 4 (b), a plurality of first protrusions 1b, 1b,...

  The string-side knurled portion 1a is formed at the time of extrusion molding of the extruded shape member 10, and is formed on the side surfaces of the connection plates 16 and 17 as shown in FIG. In the present embodiment, the connection plates 16 and 17 are formed on both side surfaces.

  As shown in FIG. 4B, the first protrusion 1b has a substantially triangular cross section, and extends in the longitudinal direction of the extruded shape member 10 (in the direction perpendicular to the plane of FIG. 4). The top of the first protrusion 1b has an arc shape. The height h of the first protrusion 1b is desirably 1.0 mm or less, and more desirably 0.2 mm or more and 0.5 mm or less.

  In addition, as shown to (a) of FIG. 4, the groove 1c is formed in the connection plates 16 and 17. FIG. The groove 1c serves as a mark (reference) when the bolt insertion hole 1d (see FIG. 7) is formed, and is formed so as to pass through the center position of the bolt insertion hole 1d. The groove 1c is parallel to the first protrusion 1b and is formed when the extruded shape member 10 is extruded.

  The diagonal member 2 comprises a second extruded shape member 20 shown in FIG. The diagonal member 2 (extrusion shape member 20) is formed between a pair of flanges 21 and 21 opposed to each other with a space therebetween, a pair of webs 22 and 22 connecting both flanges 21 and 21, and the webs 22 and 22. It has a pair of partition parts 23 and 23 that partition the layered space.

  The second extruded shape member 20 is an extruded shape member made of an aluminum alloy having three hollow spaces, and is continuous in the direction perpendicular to the paper surface of FIG. Of the three hollow spaces, the hollow space located in the center has a flat shape.

  The center portion in the width direction of the flange 21 is formed thinner than the portions on both sides thereof. The side portion of the flange 21 is curved in a circular arc shape and extends toward the other flange 21.

  The webs 22 and 22 are arranged so as to connect the center portions in the width direction of the flanges 21 and 21 and face each other in parallel with an interval at which the first connection plate 16 (see FIG. 4) can be inserted. ing. Each web 22 has a flat plate shape, but the portion corresponding to the flat hollow space is thicker than the other portions.

  Each of the webs 22 and 22 includes a lattice side knurled portion 2a. As shown in FIG. 5B, a plurality of second protrusions 2b, 2b,...

  The lattice side knurled portion 2a is formed at the time of extrusion molding of the extruded shape member 20, and includes an inner side surface of one web 22 (a side surface facing the other web 22 of both side surfaces of the one web 22) and It is formed on each of the inner side surfaces of the other web 22 (the side surfaces facing the one web 22 among both side surfaces of the other web 22). That is, both lattice side knurl parts 2a and 2a are opposed to each other with a flat hollow space in between. In this embodiment, the lattice side knurled portion 2a is formed only on the thick portion of the web 22 (the portion corresponding to the flat hollow portion), but it may be formed on the thin portion of the web 22. Absent.

  The second protrusion 2b has a substantially triangular cross section and extends in the longitudinal direction of the extruded shape member 20 (in the direction perpendicular to the paper surface of FIG. 5B). In addition, the top part of the 2nd protrusion 2b is exhibiting circular arc shape. The height of the second protrusion 2b is desirably 1.0 mm or less, and more desirably 0.2 mm or more and 0.5 mm or less.

  As shown in FIG. 6, grooves 2 c and 2 c are formed on the outer surface of the web 22. The groove 2c serves as a mark (reference) when the bolt insertion hole 2d is formed, and is formed so as to pass through the center position of the bolt insertion hole 2d. The groove 2c is parallel to the second protrusion 2b (see FIG. 5B) and is formed when the extruded shape member 20 is extruded.

  The partition part 23 shown in FIG. 5 is arrange | positioned so that the thin parts of the webs 22 and 22 may be connected. The partition portion 23 of the present embodiment has a band plate shape and is parallel to the central portion in the width direction of the flange 21.

  As shown in FIG. 6, the end face of the diagonal member 2 is inclined with respect to a plane whose normal is the longitudinal direction of the diagonal member 2 (extrusion direction of the extruded shape member 20). Note that the inclination angle of the diagonal member 2 coincides with the angle θ shown in FIG. 2 (inclination angle of the diagonal member 2 with respect to the lower chord member 1A and the upper chord member 1B).

  Further, a bolt insertion hole 2 d and a notch 2 e are formed at the end of the diagonal member 2. The bolt insertion hole 2 d is formed in both the pair of webs 22 and 22.

  The bolt insertion hole 2d corresponds to the bolt insertion hole 1d (see FIG. 7) of the first connection plate 16. When the connection plate 16 is inserted between the lattice knurls 2a and 2a and the webs 22 and 22 are superimposed on the connection plate 16, the bolt insertion holes 1d of the connection plate 16 and the bolt insertion holes 2d of the web 22 communicate with each other. It becomes like this.

  The notch 2e is formed by cutting away the thin portion and the partition 23 at the center in the width direction of the flange 21. When the notches 2e and 2e are formed, the first connection plate 16 (see FIG. 6) can be inserted between the lattice side knurled portions 2a and 2a.

  As shown in FIG. 7, the lower cross member 3 </ b> A includes a pair of flanges 31 and 31 that face each other with a space therebetween, and a pair of webs 32 and 32 that connect the flanges 31 and 31. The lower cross member 3A is made of an extruded shape made of an aluminum alloy.

  The webs 32, 32 are opposed to each other with an interval where the second connection plate 17 can be inserted. A lattice side knurled portion 3a is formed on the inner side surface of one web 32 and the inner side surface of the other web 32, and a plurality of second protrusions are juxtaposed on the lattice side knurled portion 3a. Also, a bolt insertion hole 3d and a notch 3e are formed at the end of the lower cross member 3A.

  Although not shown, the upper cross member 3B shown in FIG. 1 is made of the same extruded shape as the lower cross member 3A.

  Next, with reference to FIG. 7 and FIG. 8, the structure of the junction part (node) of a chord material and a lattice material is demonstrated in detail. 7 and 8 are views showing the joint portion between the lower chord member 1A and the lower horizontal member 3A, the joint portion between the lower chord member 1A and the diagonal member 2, the joint portion between the upper chord member 1B and the oblique member 2, and the upper chord. The same applies to the joint between the material 1B and the upper cross member 3B.

  At the joint portion between the lower chord member 1A and the lower cross member 3A, the chord side knurled portion 1a and the lattice side knurled portion 3a are superposed. In the present embodiment, the connection plate 17 of the lower chord member 1A is sandwiched between the webs 32 and 32 of the lower cross member 3A (see FIG. 8), and one string side knurled portion 1a of the connection plate 17 is one web 32. The other knurled knurl portion 1a of the connection plate 17 faces the lattice knurl portion 3a of the other web 32. Since the extrusion direction of the lower chord material 1A is the α direction in FIG. 7 and the extrusion direction of the lower cross member 3A is the β direction in FIG. 7, the first protrusion 1b of the chord side knurled portion 1a, 1b,... (See FIG. 4B) and the second protrusion of the lattice side knurled portion 3a are not parallel to each other and always intersect.

  The lower chord member 1A and the lower cross member 3A are joined by a bolt B. The bolt B is a high-strength bolt and is disposed so as to penetrate the string-side knurled portion 1a and the lattice-side knurled portion 3a. That is, the shaft portion of the bolt B is inserted into the bolt insertion hole 1 d of the connection plate 17 and the bolt insertion hole 2 d of the web 22.

  When the nut N is screwed onto the shaft portion of the bolt B and tightened, the fastening force of the bolt B acts on the string side knurled portion 1a and the lattice side knurled portion 3a, and the first protrusion of the string side knurled portion 1a and the lattice The first ridge and the second ridge are crushed at the intersection of the side knurl portion 3a with the second ridge. In other words, at the intersection of both ridges, one ridge has bitten into the other ridge. FIG. 8 shows a state before the bolt B is tightened (a state in which the protrusion is not crushed).

  According to the frame structure F according to the present embodiment, at the joint portion between the lower chord member 1A or the upper chord member 1B and the diagonal member 2, the first protrusion 1b of the chord-side knurled portion 1a and the second of the lattice-side knurled portion 2a. Since the ridge 2b crosses obliquely and the ridges 1b and 2b are crushed at the intersection, the frictional resistance between the string side knurled portion 1a and the lattice side knurled portion 2a can be increased. . Similarly, at the joint portion between the lower chord member 1A and the lower cross member 3A and the joint portion between the upper chord member 1B and the upper cross member 3B, the first protrusion of the chord side knurled portion 1a and the second protrusion of the lattice side knurled portion 3a. Since the ridge intersects obliquely or vertically and both protrusions are crushed at the intersection, the frictional resistance between the string side knurl portion 1a and the lattice side knurl portion 3a can be increased. That is, according to the frame structure F according to the present embodiment, the diagonal member 2 and the lower horizontal member 3A can be joined to the lower chord member 1A in a state close to rigid joining, and the diagonal member 2 and It becomes possible to join the upper cross member 3B to the upper chord member 1B.

  Moreover, since each knurled portion 1a, 2a, 3a is formed at the time of extrusion molding of the extruded shape member, it is not necessary to perform a rough surface treatment such as a blast treatment.

  In the present embodiment, the upper chord member 1A and the lower chord member 1B have the chord-side knurled portions 1a formed on both side surfaces of the connection plate 16, and the diagonal member 2 has the inner surface of one web 22 Since the lattice side knurled portion 2a is formed on each of the inner side surfaces of the other web 22, the string side knurled portion 1a is formed only on one side surface of the connection plate 16 (or only on one web 22 only). Compared to the case where the lattice-side knurled portion 2a is formed), the contact area between the two increases, and as a result, the joint state between the two can be brought close to a rigid joint. Similarly, the string side knurled portion 1 a is formed on each of both side surfaces of the connection plate 17, and the inner side surface of one web 32 and the inner side surface of the other web 32 in the lower cross member 3 </ b> A and the upper cross member 3 </ b> B. Since the lattice-side knurl portion 3a is formed only on one side surface of the connection plate 17, the lattice-side knurl portion 2a is formed only on one web 32. 2), the contact area between the two increases, and as a result, the joint state between the two can be brought close to a rigid joint.

  No. in Table 1 Two specimens 1 to 4 were prepared, a tensile test was performed on each specimen, and the slip coefficient was determined. The result shown in FIG. 9 was obtained. Here, no. 1 is a case (comparative example) which does not have a knurled part. No. 2 to 4, the string side knurled portion is formed on both side surfaces of the connection plate, and the lattice side knurled portion is formed on each inner surface of the pair of webs. The first protrusion of the string side knurled portion and the lattice side knurled portion The second ridge of the part was orthogonal. In the graph of FIG. 9, the slip coefficient at the time when the displacement at the joint becomes 0.5 mm is plotted. The string material and the lattice material are JIS A6N01 alloy that has been subjected to T5 treatment. The diameter of the bolt is M12, and the material of the bolt is F8T. The tension applied to the bolt is 50.4 kN.

  As can be seen from FIG. 9, the slip coefficient of the example (No. 2 to 4) is larger than the slip coefficient of the comparative example (No. 1). No. In 2-4, no. The slip coefficient of 2 was the highest, and the slip coefficient was about twice that of the comparative example.

  In addition, in this embodiment, although the double layer type (multi-layer type) frame structure F which exhibits flat form was illustrated, it is not the meaning which limits the application range of the frame structure which concerns on this invention. Although illustration is omitted, it may be in the form of a shell, vault, dome, etc., and of course, it may be a single layer type (single layer type). In the present embodiment, a case where a three-dimensional truss is formed is illustrated, but a flat truss may be used, and a string other than a truss (for example, a ladder or a lattice) may be used. You may combine a material and a lattice material.

  In the present embodiment, the case where the chord members 1A and 1B are formed by the hollow shape has been exemplified, but it goes without saying that the chord material may be formed by a semi-hollow shape member or a solid shape member.

  In the present embodiment, the chord members 1A and 1B including the four connection plates 16 and 17 that spread radially are illustrated, but the number, position, orientation, and the like of the connection plates are not limited. What is necessary is just to set suitably the number of connection plates etc. according to the number and direction of the lattice material connected to a chord material.

  In this embodiment, although the lattice material 2 which comprises a pair of webs 22 and 22 was illustrated, it is not the meaning which limits the number of webs. A lattice material having one web may be used, or a lattice material having three or more webs may be used. Further, in this embodiment, the case where the lattice materials 2, 3A, 3B are formed by the hollow shape material is exemplified, but it is needless to say that the lattice material may be formed by the semi-hollow shape material or the solid shape material.

  In the present embodiment, the chord-side knurled surface 1 a is formed on both side surfaces of the connection plate 16, and the lattice-side knurled portion 2 a is formed on each of the inner surface of one web 22 and the inner surface of the other web 22. However, the chord-side knurled surface 1 a may be formed only on one side surface of the connection plate 16, and the lattice-side knurled portion 2 a may be formed only on one web 22.

  In the present embodiment, the case where the connection plate is inserted between the pair of webs is illustrated. However, even if the pair of connection plates are arranged side by side on the chord material and the lattice material web is inserted between the pair of connection plates, Good.

F Frame structure 1A Lower chord material (string material)
1B Upper chord material (string material)
DESCRIPTION OF SYMBOLS 1a String side knurled part 1b Rib 10 Extruded shape material 16 and 17 for string materials Connection plate 2 Diagonal material (lattice material)
2a Lattice side knurled portion 2b Projection line 20 Extruded shape material 22 for diagonal material Web 3A Lower horizontal material (lattice material)
3B Upper horizontal material (Lattice material)
32 Web 3a Lattice side knurled part B Bolt

Claims (4)

A framework structure composed of a combination of an aluminum alloy string material and a lattice material,
The string member has a string side knurled portion formed by arranging a plurality of first protrusions in parallel,
The chord side knurled portion is formed at the time of extrusion molding of an extruded shape member that is an element of the chord material,
The lattice material has a lattice side knurled portion formed by juxtaposing a plurality of second protrusions,
The lattice side knurled portion is formed at the time of extrusion molding of an extruded profile that is a source of the lattice material,
In the joint portion between the string material and the lattice material, the string side knurled portion and the lattice side knurled portion are overlapped,
Due to the fastening force of the bolts penetrating the string side knurled portion and the lattice side knurled portion, the first and second ridges are crushed at the intersection of the first and second ridges. A skeleton structure characterized by comprising: The string material has a connection plate to which the lattice material is connected,
The string side knurled portion is formed on each of both side surfaces of the connection plate,
The lattice material has a pair of webs facing each other with an interval through which the connection plate can be inserted,
The frame structure according to claim 1, wherein the lattice side knurled portion is formed on each of an inner surface of one of the webs and an inner surface of the other of the webs.   The frame structure according to claim 1 or 2, wherein a height of the first protrusion and the second protrusion is 1.0 mm or less.   The frame structure according to claim 1 or 2, wherein the height of the first protrusion and the second protrusion is in a range of 0.2 mm or more and 0.5 mm or less.

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