JP2005315034A - Stair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stair equipped with a truss structural body having high flexibility of arrangement of lattice materials and capable of arranging lattice materials in always keeping a harmony in spite of the magnitude of gradient of the stair. <P>SOLUTION: The truss structural body T1 is constituted of an upper chord member U having a plurality of upper chord node members 1 arranged at regular intervals, a lower chord member L having a plurality of lower chord node members 2 arranged at regular intervals and a plurality of lattice materials 30 arranged between the upper chord member U and the lower chord members L. A connecting bolt 33 on one end side of the lattice material 30 is screwed to a bolt insertion hole of each lower chord node member 2, and a tread S is fixed to the upper chord node member 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to stairs.

As a staircase having a clean appearance, Patent Document 1 discloses a structure in which left and right side girders are formed of a truss structure. The truss structure of the staircase is composed of an upper chord material and a lower chord material, and a plurality of lattice materials arranged between the upper chord material and the lower chord material. In addition, the lattice material includes a horizontally disposed material and a vertically disposed lattice material, and the side end portion of the tread is supported by the horizontally disposed lattice material.
JP 2003-328520 A (FIG. 3)

  However, in the staircase according to Patent Document 1, although the appearance is clear, the structure is such that the tread is supported by a horizontally arranged lattice material, and therefore, the degree of freedom in the arrangement of the lattice material is low, and the step gradient Depending on the size, the balance between the length of the lattice material arranged horizontally and the length of the lattice material arranged vertically may be disrupted, which may adversely affect the aesthetics of the truss structure. Become.

  Therefore, the present invention provides a staircase having a truss structure that has a high degree of freedom in the arrangement of the lattice material and that can always arrange the lattice material in a harmonious manner regardless of the size of the staircase gradient. Is an issue.

  The present invention created in order to solve such problems is a staircase comprising a truss structure constructed between an upper floor and a lower floor, and a plurality of treads supported by the truss structure. The truss structure includes a plurality of upper chord members arranged side by side in the width direction of the tread, and at least one lower chord member disposed in parallel with the upper chord members below the upper chord members of the plurality of strips. And a plurality of lattice materials arranged between each upper chord material and each lower chord material, and each upper chord material has a plurality of upper chord node members arranged at equal intervals. Each lower chord member has a plurality of lower chord node members arranged at equal intervals, and each lattice member is provided with connecting bolts at both ends thereof, and each upper chord node member and The lower chord node members are bolts to which the connecting bolts of the lattice materials are screwed. An insertion hole is formed, a connection bolt on one end side of each lattice material is screwed into a bolt insertion hole on each upper chord node member, and a connection bolt on the other end side is inserted into the bolt of each lower chord node member It is screwed into the hole, and each of the treads is fixed to each of the upper chord node members.

  Such a staircase has a configuration in which each tread is fixed to the upper chord node member, so that it is not necessary to arrange the lattice material horizontally. That is, this staircase has a high degree of freedom in the arrangement of the lattice material, and it is possible to arrange the lattice material always in harmony regardless of the magnitude of the staircase gradient.

  In the staircase according to the present invention, each of the upper chord members has one upper threading member arranged along the step inclination direction, and the plurality of upper chord node members are fixed to the upper threading member. Each of the lower chord members has one lower threading member arranged along the staircase inclination direction, and the plurality of lower chord node members are fixed to the lower thread member. May be.

In this way, the upper chord material is configured simply by arranging and fixing a plurality of upper chord node members on one upper thread member at equal intervals. Similarly, a plurality of lower chord node members are arranged on one lower thread member. Since the lower chord material is constructed simply by arranging and fixing the at regular intervals, the manufacture of the stairs becomes easy. In addition, as an upper threading material and a lower threading material, for example, an extruded profile can be used.
According to this, since the upper chord material and the lower chord material are configured using the threading material, the number of joints is reduced at the nodal portion, and the assembly is facilitated.

  In the staircase according to the present invention, each of the upper chord members has an upper chord frame member disposed between the upper chord nodal members adjacent in the step inclination direction, and each of the lower chord members is adjacent in the step inclination direction. The lower chord frame member has a lower chord frame member disposed between the lower chord nodule members, and the upper chord frame member and the lower chord frame member are provided with connecting bolts at both ends thereof. Bolt insertion holes into which the connection bolts of the upper chord frame members are screwed are formed, and bolt insertion holes into which the connection bolts of the lower chord frame members are screwed are formed at the lower chord frame members. The connection bolts of the upper chord frame members are screwed into the bolt insertion holes of the upper chord node members, and the connection bolts of the lower chord frame members are screwed into the bolt insertion holes of the lower chord node members. It may be the one who is.

  In other words, such a staircase consists of a plurality of upper chord frame members arranged in the stair inclination direction to form an upper chord material, and similarly, a plurality of lower chord frame members arranged in a stair inclination direction to constitute a lower chord material. is there. If it does in this way, it will become possible to adjust the length of an upper chord material and a lower chord material only by increasing / decreasing the number of upper chord frame materials and a lower chord frame material.

  In the stairs according to the present invention, a plurality of upper chord connecting members are disposed between the adjacent upper chord members, and each upper chord connecting member is provided with connecting bolts at both ends thereof, The member is formed with bolt insertion holes into which the connection bolts of the upper chord connection members are screwed, and the connection bolts of the upper chord connection members are screwed into the bolt insertion holes of the upper chord joint members. It may be.

  In this way, the torsional rigidity and the bending rigidity in the left-right direction of the truss structure are improved, so that the torsion and roll that occur when the stairs are raised and lowered can be reduced. In addition, you may mount each said tread on each said upper chord connection material. In other words, the tread board may be fixed to the upper chord node member via the upper chord connecting member.

  In the staircase according to the present invention, each of the treads may be placed on a tread receiving member erected between the upper chord node members adjacent in the left-right direction. That is, the tread may be fixed to the upper chord node member via the tread receiving material.

  In this case, the left and right upper chord members are connected to each other by the tread plate receiving member and integrated with each other, so that the displacement and deformation in the left and right direction are further reduced. That is, since the bending rigidity in the left-right direction of the entire staircase is improved, it is possible to significantly suppress the rolling when the staircase is raised and lowered. Further, since the center portion of the tread is supported by the tread receiving material, the bending of the tread is reduced.

  In the staircase according to the present invention, the truss structure has two or more lower chord members, and a plurality of lower chord connecting members are disposed between the adjacent lower chord members, and each lower chord connecting member Are connected to both ends, and each lower chord node member is formed with a bolt insertion hole into which the connecting bolt of each lower chord connecting member is screwed. Each connecting bolt may be screwed into a bolt insertion hole of each lower chord node member.

  In this way, the torsional rigidity and the bending rigidity in the left-right direction of the truss structure are improved, so that the torsion and roll that occur when the stairs are raised and lowered can be reduced.

  In the staircase according to the present invention, the left and right surfaces of the truss structure may be opposed in an inverted C shape.

  In this way, the appearance becomes clear, and a light impression can be given to the viewer. Also, the space under the stairs is wider than when the left and right construction surfaces are vertical. Note that the left and right construction surfaces refer to planes including the upper chord material and the lower chord material.

  In the staircase according to the present invention, a reinforcing plate may be attached in the surface of the truss structure.

  In this way, the torsional rigidity and the bending rigidity in the vertical direction of the truss structure are improved, so that it is possible to reduce the torsion and shaking that occur when the stairs are raised and lowered. In addition, you may attach a reinforcement board not only to the right and left surface of a truss structure but to the upper and lower surfaces. Here, the “upper” construction surface refers to a plane including two or more upper chord members, and the “lower” composition surface refers to a plane including two or more lower chord members.

  According to the present invention, it is possible to obtain a staircase having a truss structure that has a high degree of freedom in the arrangement of the lattice material and that can always arrange the lattice material in a harmonious manner regardless of the magnitude of the staircase gradient. .

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

<First embodiment>
As shown in FIGS. 1 and 2, the staircase according to the first embodiment includes a truss structure T1 constructed between the upper floor F2 and the lower floor F1, and a plurality of steps supported by the truss structure T1. , Treads S, S,... Further, a handrail R1 that is inclined in a staircase gradient is disposed above the side ends of the treads S, S,..., And a handrail support R2 that supports the handrail R1 is provided on each tread S. Yes.

  The truss structure T1 is composed of two upper chord members U, U arranged side by side in the width direction of the tread plate S, and two lower chord members arranged in parallel with the upper chord members U in the middle lower part of the upper chord members U, U. L, L and a plurality of lattice materials 30, 30,... Arranged between each upper chord material U and each lower chord material L. Further, in this embodiment, it is shown in FIG. 3 and FIG. As described above, a plurality of upper chord connecting members 40, 40,... Are disposed between the upper chord members U, U adjacent in the left-right direction, and a plurality of lower chord connecting members 50 are disposed between the lower chord members L, L adjacent in the left-right direction. , 50,... Are arranged. Moreover, as shown also in FIG.5 (b), as for the truss structure T1, the structure surface of the right and left is facing reverse C shape, and the shape seen from the staircase inclination direction has shown the inverted trapezoid. In FIG. 5 (b), illustration of the tread board S shown in FIG. 5 (a) and a tread board support frame member 60 described later is omitted.

  As shown in FIGS. 4 and 5A, the upper chord material U includes a plurality of upper chord node members 1, 1,... Arranged at equal intervals along the staircase inclination direction (vertical direction in FIG. 4). A plurality of upper chord frame members 10, 10,...

  The upper chord nodal member 1 includes upper chord frame members 10 and 10 that are adjacent to each other in the staircase tilt direction, lattice materials 30 and 30 that are adjacent to each other in the staircase tilt direction, an upper chord connecting member 40, and a tread board support frame member 60 (see FIG. 3). And are connected. As shown in FIG. 6, the upper chord node member 1 is made of an aluminum alloy member having a spherical shape as a whole, and has a plurality of bolt insertion holes 1a, 1b, 1c, 1d drilled toward the center thereof. ing. A mounting surface 1e is formed around each bolt insertion hole 1a of the upper chord node member 1 so that the end surfaces of the upper chord frame member 10 and the like are in close contact with each other. The plurality of bolt insertion holes 1 a, 1 b, 1 c, 1 d correspond to the upper chord frame members 10, 10, the lattice members 30, 30, the upper chord coupling member 40, and the tread support frame member 60 that are connected to the upper chord node member 1. (See FIGS. 5A and 5B). That is, in this embodiment, the upper chord node member 1 is mounted on the two bolt insertion holes 1a and 1a into which the connecting bolt 13 mounted on the end portion of the upper chord frame member 10 is screwed and the end portion of the lattice member 30. Two bolt insertion holes 1b and 1b (only one is shown in FIG. 6) into which the connected connecting bolt 33 (see FIGS. 5A and 5B) is screwed, and the upper chord connecting member 40 One bolt insertion hole 1c into which the connecting bolt 43 (see FIG. 5B) attached to the end is screwed, and a connecting bolt 63 (see FIG. 5A) attached to the end of the footboard support frame member 60. )) Is provided with one bolt insertion hole 1d.

  As shown in FIG. 4, the upper chord frame member 10 is disposed between the upper chord node members 1, 1 adjacent to each other in the staircase inclination direction, and another upper chord frame member adjacent to the staircase inclination direction via the upper chord node member 1. 10 is connected. As shown in FIG. 6, the upper chord frame member 10 is formed in a tubular main body 11, a disk-shaped end plug 12 that closes an opening of the main body 11, and a bolt insertion hole 12 a of the end plug 12. The connecting bolt 13 is inserted from the main body 11 side, and a rotating body 14 is provided around the shaft 13 a of the connecting bolt 13. In FIG. 6, only one end side of the upper chord frame member 10 is shown, but the other end side (not shown) has the same configuration. That is, the upper chord frame member 10 is provided with the connecting bolts 13 and 13 at both ends thereof, and each connecting bolt 13 is screwed into the bolt insertion hole 1 a of the upper chord node member 1.

  The main body 11 is made of a hollow extruded shape made of an aluminum alloy. In addition, the cross-sectional shape of the main-body part 11 is not limited to a circular thing, A polygonal thing may be sufficient.

  The end plug 12 is made of an aluminum alloy plate, and is fixed to the end of the main body 11 by friction welding or welding.

  The connecting bolt 13 is inserted into the bolt insertion hole 12 a of the end plug 12 from the main body portion 11 side, and the shaft portion 13 a protrudes from the end surface 12 b of the end plug 12. In addition, the center line of the connecting bolt 13 and the center line of the main body part 11 coincide. As shown in FIG. 7A, the shaft portion 13a is provided with a pair of locking portions 13b and 13b that abut against the end surface 12b of the end plug 12 when the connecting bolt 13 is most retracted. . As shown in FIG. 6, the locking portions 13 b and 13 b are formed by inserting a pin 13 d longer than the diameter of the shaft portion 13 into a pin hole 13 c formed in the shaft portion 13. The locking portions 13b and 13b also function as stoppers that prevent the connecting bolt 13 from coming out to the main body portion 11 side.

  The rotating body 14 is made of an aluminum alloy cast, forged product, or cut product, and as shown in FIG. 6, a short columnar base portion 14a that abuts on the end surface 12b of the end plug 12 and the base portion 14a are integrally formed. And a truncated cone portion 14b. A through hole 14e is formed in the center of the rotating body 14 from the end surface 14c on the end plug 12 side of the base portion 14a to the end surface 14d on the upper nodal member 1 side of the truncated cone portion 14b. A pair of guide grooves 14f, 14f facing each other with the center line interposed therebetween are formed along the center line. The shaft portion 13a of the connecting bolt 13 is inserted through the through hole 14e, and the engaging portions 13b and 13b of the connecting bolt 13 are engaged with the pair of guide grooves 14f and 14f. That is, the connecting bolt 13 rotates together with the rotating body 14 because the engaging portions 13 b and 13 b engage with the guide grooves 14 f and 14 f of the rotating body 14. Further, the guide grooves 14 f and 14 f are connected to the rotating body 14. Since it is formed along the center line, it advances and retreats in the direction of the center line. As shown in FIG. 7A, the length of the rotating body 14 is the axis protruding from the end surface 12b when the locking portions 13b, 13b of the connecting bolt 13 are in contact with the end surface 12b of the end plug 12. It is slightly smaller than the length of the portion 13a.

  In order to connect the upper chord frame member 10 to the upper chord node member 1, as shown in FIG. 7A, the end surface 14d of the rotating member 14 is brought into contact with the mounting surface 1e of the upper chord node member 1 to thereby end the end surface of the rotating member 14. After inserting the tip of the shaft portion 13a of the connecting bolt 13 slightly protruding from the bolt insertion hole 1a of the upper chord node member 1, the connecting bolt is rotated via the rotating body 14 as shown in FIG. Then, the shaft portion 13 a of the connecting bolt 13 may be screwed into the bolt insertion hole 1 a of the upper chord node member 1. Each bolt insertion hole 1a is formed toward the center of the upper chord node member 1 and the center line of the connecting bolt 13 coincides with the center line of the main body portion 11. The center line of the upper chord frame member 10 connected to is passed through the center of the upper chord node member 1.

  As shown in FIGS. 4 and 5 (a), the lower chord material L includes a plurality of lower chord node members 2, 2,... Arranged at equal intervals along the stair inclination direction (vertical direction in FIG. 4), and the staircase. Has a plurality of lower chord frame members 20, 20,...

  The lower chord node member 2 is connected to lower chord frame members 20 and 20 adjacent to each other in the staircase tilt direction, lattice materials 30 and 30 adjacent to each other in the staircase tilt direction, and a lower chord coupling member 50. The detailed configuration of the lower chord node member 2 is the same as the configuration of the upper chord node member 1 described above, and a detailed description thereof will be omitted. However, the lower chord node member 2 is provided at the end of the lower chord frame member 20. Two bolt insertion holes into which the attached connecting bolt 23 (see FIG. 5A) is screwed and a connecting bolt 33 (see FIG. 5A) attached to the end of the lattice material 30 are screwed together. Two bolt insertion holes, and one bolt insertion hole into which a connection bolt 53 (see FIG. 5B) attached to the end of the lower chord connection member 50 is screwed are drilled toward the center. It is installed.

  The lower chord frame member 20 is disposed between the lower chord node members 2 and 2 adjacent to each other in the staircase inclination direction, and is connected to another lower chord frame member 20 adjacent to the staircase inclination direction via the lower chord node member 2. The detailed configuration of the lower chord frame member 20 is the same as that of the upper chord frame member 10 described above, and thus detailed description thereof will be omitted. However, as shown in FIG. A connecting bolt 23 having the same configuration as that of the connecting bolt 13 shown in FIG. 6 is attached to both ends.

  Further, the procedure for connecting the lower chord frame member 20 to the lower chord node member 2 is the same as the procedure for connecting the upper chord frame member 10 to the upper chord node member 1, and thus detailed description thereof is omitted. Each of the connecting bolts 23, 23 attached to both ends may be screwed into the bolt insertion hole of the lower chord node member 2.

  As shown in FIG. 4, the plurality of lattice members 30, 30,... Are arranged in a zigzag shape in a composition plane (plane) including the upper chord member U and the lower chord member L, and each lattice member 30 is One end is connected to the upper chord node member 1, and the other end is connected to the lower chord node member 2. The detailed configuration of the lattice material 30 is the same as the configuration of the above-described upper chord frame material 10, and thus detailed description thereof will be omitted. However, as shown in FIGS. A connection bolt 33 having the same configuration as that of the connection bolt 13 shown in FIG.

  Further, the procedure for connecting the lattice material 30 to the upper chord node member 1 and the lower chord node member 2 is the same as the procedure for connecting the upper chord frame member 10 to the upper chord node member 1, and therefore, detailed description thereof is omitted. The connection bolt 33 mounted on one end side of the material 30 is screwed into the bolt insertion hole 1b (see FIG. 6) of the upper chord node member 1, and the connection bolt 33 mounted on the other end side is connected to the lower chord node member 2. What is necessary is just to screw in the bolt insertion hole which is not shown.

  As shown in FIG. 4, the plurality of upper chord connecting members 40, 40,... Are arranged in a ladder shape in a plane (plane) including the upper chord members U adjacent to each other in the left-right direction. Both ends of 40 are connected to upper chord node members 1 and 1 located at the same height. As shown in FIG. 5B, connecting bolts 43, 43 having the same configuration as the connecting bolt 13 shown in FIG. Further, a tread plate mounting portion 42 is integrally formed on the upper portion of the main body portion 41 (see FIG. 3) of the upper string connecting member 40. The tread plate mounting portion 42 has a horizontal upper surface and abuts against the back surface of the tread plate S. In addition, since the other structure of the upper chord connection material 40 is the same as that of the structure of the above-mentioned upper chord frame material 10, the detailed description is abbreviate | omitted.

  Further, the procedure for connecting the upper chord connecting member 40 to the upper chord nodal member 1 is also the same as the procedure for connecting the upper chord frame member 10 to the upper chord nodal member 1, and therefore detailed description thereof will be omitted. Each of the connecting bolts 43, 43 attached to both ends may be screwed into the bolt insertion hole 1 c (see FIGS. 5 and 6) of the upper chord node member 1.

  As shown in FIG. 4, the plurality of lower chord connecting members 50, 50,... Are arranged in a ladder shape within a plane (plane) including the lower chord members L adjacent to each other in the left-right direction. Both ends of 50 are connected to lower chord node members 2 and 2 located at the same height. The detailed configuration of the lower chord connecting member 50 is the same as that of the upper chord frame member 10 described above, and thus detailed description thereof will be omitted. However, as shown in FIG. At both ends, connecting bolts 53 and 53 having the same configuration as the connecting bolt 13 shown in FIG. 6 are mounted.

  The procedure for connecting the lower chord connecting member 50 to the lower chord nodal member 2 is also the same as the procedure for connecting the upper chord frame member 10 to the upper chord nodal member 1, and thus detailed description thereof is omitted. Each of the connecting bolts 53 and 53 attached to both ends may be screwed into a bolt insertion hole (not shown) of the lower chord node member 2.

  As shown in FIG. 5A, one end of each tread board support frame member 60 is connected to the upper chord node member 1, and the other end is connected to a fixing portion S <b> 1 formed on the back side of the tread board S. . Since the detailed configuration of each treadboard support frame member 60 is the same as that of the above-described upper chord frame member 10, detailed description thereof will be omitted. Connection bolts 63, 63 having the same configuration as the connection bolt 13 shown are mounted.

  Further, the procedure for connecting the tread board support frame member 60 to the upper chord node member 1 is the same as the procedure for connecting the upper chord frame member 10 to the upper chord node member 1, and a detailed description thereof will be omitted. ), The connecting bolt 63 mounted on one end of the tread support frame member 60 is screwed into the bolt insertion hole 1d (see FIG. 5) of the upper chord node member 1 and mounted on the other end. The connecting bolt 63 may be screwed into a bolt insertion hole (not shown) formed in the fixing portion S1 of the tread plate S.

  Each step board S is made of a plate material made of wood or metal, and as shown in FIG. 5A, the rear side is placed and fixed on the tread board mounting portion 42 of the upper chord connecting member 40, and the front side is supported by the tread board. The frame members 60 and 60 are supported. That is, each tread board S is fixed to a pair of left and right upper chord node members 1, 1 arranged at the same height via the upper chord connecting member 40 and the tread board support frame members 60, 60. A fixing portion S1 is recessed on the back surface of the tread plate S, and a bolt insertion hole (not shown) is formed in the fixing portion S1.

  In the present embodiment, the tread plate S is mounted and fixed on the upper surface of the tread plate mounting portion 42 of the upper chord connecting member 40 fixed to the left and right upper chord node members 1, 1. The tread plate S may be mounted and fixed on the upper surface of a tread plate receiving material (not shown) installed between the members 1 and 1, and the tread plate S is directly mounted on the left and right upper chord node members 1 and 1. The structure to fix may be sufficient.

Next, the construction procedure of the stairs will be described with reference to FIGS. 2 and 5 (a).
First, as shown in FIG. 2, the truss structure T1 is installed between the lower floor F1 and the upper floor F2. That is, the lower end of the truss structure T1 is fixed to the floor surface or the like of the lower floor F1 via the support shoe, and the upper end is fixed to the wall or the like of the upper floor F2 via the support shoe. The truss structure T1 is constructed by connecting the various members described above in a factory or the like.

  Next, as shown in FIG. 5A, a tread plate support frame member is placed between the upper chord node member 1 and the fixing portion S1 of the tread plate S while the rear side of the tread plate S is placed on the upper surface of the tread plate placing portion 42. 60 is disposed, and the rear end of the tread plate S is fixed to the upper surface of the tread plate mounting portion 42 with bolts or screws as appropriate.

  Finally, when the handrail support R2 is erected on the side end of each step board S and the handrail R1 (see FIG. 2) is fixed to the upper end, the construction of the stairs is completed.

  Note that the steps for constructing the stairs may be changed as appropriate. For example, the truss structure T1 and the plurality of treads S, S,... There is no problem.

  The stairs according to the present embodiment described above is different from the conventional stairs that support the tread with a heavy member such as a grooved steel or I-shaped steel, and the treads S, S, Because it is a structure that supports ..., there is a bright and open feeling, there is no feeling of pressure even if it is built indoors. Moreover, as shown in FIG. 5 (b), the left and right surfaces of the truss structure T1 face each other in an inverted C shape, so that a sharp and novel impression can be given to the viewer. Also, the space under the stairs is wider than when the left and right construction surfaces are vertical.

  Moreover, since this staircase is a structure which fixes each tread board S to the upper chord node member 1 and 1 via the upper chord connection material 40 and the tread board support frame material 60, it is not necessary to arrange the lattice material 30 horizontally. That is, the staircase according to the present embodiment has a high degree of freedom in the arrangement of the lattice material 30, and can always arrange the lattice material 30 in a harmonious manner regardless of the magnitude of the staircase gradient.

  As shown in FIG. 4, a plurality of upper chord frame members 10, 10,... Are connected in the longitudinal direction to form an upper chord member U. Similarly, a plurality of lower chord frame members 20, 20,. Since the lower chord material L is formed in a row, the lengths of the upper chord material U and the lower chord material L can be easily adjusted simply by increasing or decreasing the number of the upper chord frame material 10 and the lower chord frame material 20. It becomes. That is, even if the floor heights are different, it is possible to cope with this by simply increasing or decreasing the numbers of the upper chord frame material 10 and the lower chord frame material 20.

  Furthermore, the upper chord frame member 10, the lower chord frame member 20, the lattice member 30, the upper chord connecting member 40, the lower chord connecting member 50, and the tread support frame member 60 are different in length, and the structures of the end portions are almost the same. As a result, the types of parts can be greatly reduced, and as a result, the cost of the stairs can be reduced.

  Further, the upper chord members U, U adjacent in the left-right direction are connected to each other by a plurality of upper chord connecting members 40, 40,..., And similarly, the lower chord members L, L adjacent to the left and right are connected to each other. 50,..., The torsional rigidity and the lateral bending rigidity of the truss structure T1 are high, and therefore, the torsion and roll generated when the stairs are raised and lowered are reduced.

  In order to further improve the torsional rigidity and the bending rigidity in the left-right direction of the truss structure T1, an upper chord connecting material for connecting the upper chord members U and U is arranged obliquely with respect to the upper chord member U. May be. In this case, both ends of the upper chord coupling member are connected to upper chord node members 1 and 1 located at different heights.

  Similarly, in order to further improve the torsional rigidity and the bending rigidity in the left-right direction of the truss structure T1, the lower chord connecting material for connecting the lower chord members U and U to each other is inclined with respect to the lower chord member U. You may arrange.

  Furthermore, in order to further improve the torsional rigidity and the bending rigidity in the vertical direction of the truss structure T1, as shown in FIG. 8A, a plurality of reinforcing plates 70, 70 are provided in the left and right surfaces of the truss structure T1. , ... may be attached.

  Here, each reinforcing plate 70 is made of an acrylic or aluminum alloy plate material that has a triangular shape in a side view, and is a triangular region surrounded by the upper chord frame member 10 and the two lattice members 30, 30, or the lower chord It is arranged in a triangular region surrounded by the frame material 20 and the two lattice materials 30, 30.

  As shown in FIG. 8 (b), a projecting piece 19 projecting toward the side of the main body 11 of the upper chord frame member 10 is formed along the longitudinal direction. One side of the reinforcing plate 70 is fixed to the base plate. Further, on both sides of the main body 31 of the lattice material 30, as shown in FIG. 8 (c), projecting pieces 39, 39 projecting toward the side are formed along the longitudinal direction. One side of the reinforcing plate 70 is fixed to the projecting piece 39.

  Although not shown in the drawings, the reinforcing plate is provided in the upper and lower construction surfaces of the truss structure T1, in other words, in a plane including the left and right upper chord members U, U or in a plane including the left and right lower chord members L, L. May be attached.

<Second Embodiment>
Although the truss structure T1 for the staircase according to the first embodiment has its left and right surfaces facing each other in an inverted C shape (see FIG. 5B), the second structure shown in FIG. Like the truss structure T2 of the staircase according to the embodiment, the left and right construction surfaces may face each other in parallel.

  The staircase according to the second embodiment includes a truss structure T2 constructed between the upper floor F2 and the lower floor F1, and a plurality of step boards S, S,... Supported by the truss structure T2. Configured. Further, a handrail R1 that is inclined in a staircase gradient is disposed above the side ends of the treads S, S,..., And a handrail support R2 that supports the handrail R1 is erected on the truss structure T2. ing.

  The truss structure T2 includes two upper chord members U, U arranged in parallel in the width direction of the tread board S, and two lower chord members L arranged in parallel to the upper chord members U below the upper chord members U, U. , L, and a plurality of lattice members 30, 30,... Disposed between each upper chord member U and each lower chord member L, and in this embodiment, as shown in FIG. A plurality of upper chord connecting members 40, 40,... Are arranged between the matching upper chord members U, U, and a plurality of lower chord connecting members 50, 50,. . Moreover, as shown also in FIG.11 (b), as for the truss structure T2, the right-and-left composition surface is a vertical surface, respectively, and the shape seen from the staircase inclination direction is exhibiting the rectangle. In addition, in FIG.11 (b), illustration of the tread board S and the handrail support | pillar R2 which are shown to Fig.11 (a) is abbreviate | omitted.

  As shown in FIG. 10, the upper chord material U includes a plurality of upper chord node members 1, 1,... Arranged at equal intervals along the staircase inclination direction, and a plurality of upper chord frame members 10 connected in a staircase inclination direction. , 10,... Here, the configuration of the upper chord node member 1 is the same as that of the first embodiment except for the position of the bolt insertion hole, and the other configurations are the same. The configuration of the upper chord frame member 10 is the same as that of the first embodiment. Since it is the same as that of the embodiment, detailed description thereof will be omitted. In addition, the upper chord node member 1 located on the right side in the drawing is provided with a bolt insertion hole 1f along the vertical direction.

  The lower chord material L includes a plurality of lower chord nodal members 2, 2,... Arranged at equal intervals along the stair inclination direction, and a plurality of lower chord frame members 20, 20,. doing. Here, the configuration of the lower chord node member 2 is the same as that of the first embodiment except for the position of the bolt insertion hole, and the other configurations are the same. The configuration of the lower chord frame member 20 is the same as that of the first embodiment. Since it is the same as that of the embodiment, detailed description thereof will be omitted.

  The configurations of the lattice material 30, the upper chord connecting member 40, the lower chord connecting member 50, and the tread board support frame member 60 are the same as those of the first embodiment except for their lengths, and thus detailed description thereof is omitted. . Note that an end portion of the tread plate support frame member 60 on the tread plate S side is connected to a mounting portion S1 (see FIG. 11A) projecting from the side portion of the tread plate S.

  As shown in FIG. 11A, the lower end of the handrail column R <b> 2 is connected to the upper chord node member 1. Here, a connecting bolt R23 is attached to the lower end of the handrail column R2, and this connecting bolt R23 is screwed into a bolt insertion hole 1f (see FIG. 10) of the upper chord node member 1. A rotating body R24 is mounted around the shaft portion of the connecting bolt R23. That is, the configuration of the lower end portion of the handrail column R2 is the same as the configuration of the end portion of the upper chord frame member 10 shown in FIG. 6, and the connecting bolt 23 can be rotated via the rotating body R24. That is, in order to connect the handrail column R2 to the upper chord node member 1, the connecting bolt R23 is rotated via the rotating body R24, and the shaft portion is screwed into the bolt insertion hole 1f (see FIG. 10) of the upper chord node member 1. You just need to match. The handrail support R2 may be simply formed with a bolt at its lower end. In this case, if the handrail support R2 itself is rotated and the bolt is screwed into the bolt insertion hole 1f of the upper chord node member 1. Good. Further, the intermediate portion of the handrail support R2 is appropriately fixed to the upper tread S.

  The staircase according to the present embodiment described above is different from the conventional staircase in which the step board is supported by a heavy member such as a grooved steel or I-shaped steel, and the treads S, S, Because it is a structure that supports ..., there is a bright and open feeling, there is no feeling of pressure even if it is built indoors. In addition, as shown in FIG. 9, since the left and right construction surfaces of the truss structure T2 face each other in parallel, it is possible to give the viewer an innovative but orthodox impression.

  Further, this staircase has a configuration in which each tread board S is fixed to the upper chord node members 1, 1 via the upper chord connecting member 40 and the tread board support frame member 60, so that it is not necessary to arrange the lattice member 30 horizontally. That is, the staircase according to the present embodiment has a high degree of freedom in the arrangement of the lattice material 30, and can always arrange the lattice material 30 in a harmonious manner regardless of the magnitude of the staircase gradient.

  In addition, since the connecting bolt R23 is attached to the lower end of the handrail support R2, and the handrail support R2 is connected to the upper chord node member 1 using the connection bolt R23, the attachment work of the handrail support R2 is easily and quickly performed. It becomes possible. Furthermore, a unified design can be obtained by making the structure of the lower end portion of the handrail support R2 the same as the structure of the end portion of the upper chord frame member 10 or the like.

  In the present embodiment, the upper chord members U, U and the two lower chord members L, L constitute the truss structure T3. However, the number of the upper chord member U and the lower chord member L are limited to this. However, it can be changed as appropriate. For example, although not shown, the truss structure body may be constituted by three or more upper chord members and the same number of lower chord members.

<Third embodiment>
The stair truss structure T1 according to the first embodiment and the truss structure T2 according to the second embodiment are both configured by including two upper chord members U, U and two lower chord members L, L. However, (see FIGS. 1 and 9), like the stair truss structure T3 according to the third embodiment shown in FIG. 12, two upper chord members U, U and one lower chord member L are provided. It may be configured.

  The staircase according to the third embodiment includes a truss structure T3 constructed between the upper floor F2 and the lower floor F1, and a plurality of step boards S, S,... Supported by the truss structure T3. Configured.

  As shown in FIGS. 13 and 14, the truss structure T3 includes two upper chord members U, U arranged side by side in the width direction of the tread plate S, and each upper chord member U below the upper chord members U, U. A plurality of lattice members 30, 30, disposed between one lower chord member L and one upper chord member U and the lower chord member L and between the other upper chord member U and the lower chord member L, arranged in parallel; Further, in the present embodiment, a plurality of upper chord connecting members 40, 40,... Are arranged between adjacent upper chord members U, U. That is, as shown in FIG. 15 (b), the truss structure T3 has its left and right surfaces facing each other in an inverted C shape, and the shape viewed from the direction of the staircase is an inverted triangle. In FIG. 15B, illustration of the tread board S and the tread board support frame member 60 shown in FIG. 15A is omitted.

  As shown in FIG. 14, the upper chord material U includes a plurality of upper chord nodal members 1, 1,... Arranged at equal intervals along the staircase inclination direction, and a plurality of upper chord frame members 10 provided continuously in the staircase inclination direction. , 10,... The configuration of the upper chord node member 1 is the same as that of the first embodiment, and the configuration of the upper chord frame member 10 is the same as that of the first embodiment. Is omitted.

  The lower chord material L includes a plurality of lower chord nodal members 2, 2,... Arranged at equal intervals along the stair inclination direction, and a plurality of lower chord frame members 20, 20,. doing.

  In the present embodiment, the lower chord nodal member 2 includes a total of four lower chord frame members 20, 20 adjacent to each other in the staircase inclination direction, one upper chord member U, and the other upper chord member U. The lattice material 30 is connected. Since the detailed configuration of the lower chord node member 2 is the same as that of the first embodiment, the detailed description thereof is omitted, but the lower chord node member 2 is attached to the end portion of the lower chord frame member 20. The two bolt insertion holes into which the connected connecting bolts 23 (see FIG. 15A) are screwed and the connecting bolts 33 (see FIG. 15A) attached to the end of the lattice material 30 are screwed together. The four bolt insertion holes are each drilled toward the center. In addition, since the structure of the lower chord frame material 20 is the same as that of the first embodiment, its detailed description is omitted.

  Further, the configurations of the lattice material 30, the upper chord connecting material 40, and the tread support frame material 60 are the same as those of the first embodiment except for their lengths, and thus detailed description thereof is omitted.

  The stairs according to the present embodiment described above are different from the conventional stairs that support the tread with a heavy member such as a grooved steel or I-shaped steel, and the treads S, S, Because it is a structure that supports ..., there is a bright and open feeling, there is no feeling of pressure even if it is built indoors. Moreover, as shown in FIG. 15 (b), the left and right construction surfaces of the truss structure T3 are opposed in an inverted C shape, and the shape viewed from the direction of the staircase is triangular, so it is sharp and innovative. Impression can be given to the viewer. Also, the space under the stairs is wider than when the left and right construction surfaces are vertical.

  Moreover, since this staircase is a structure which fixes each tread board S to the upper chord node member 1 and 1 via the upper chord connection material 40 and the tread board support frame material 60, it is not necessary to arrange the lattice material 30 horizontally. That is, the staircase according to the present embodiment has a high degree of freedom in the arrangement of the lattice material 30, and can always arrange the lattice material 30 in a harmonious manner regardless of the magnitude of the staircase gradient.

  In the present embodiment, the upper chord material U, U and the lower chord material L of the two lines constitute the truss structure T3. However, the number of the upper chord material U and the number of the lower chord material L are limited to this. However, it can be changed appropriately. For example, although illustration is omitted, the truss structure may be constituted by three or more upper chord members and a lower chord member having a number smaller than one. In this case, each lower chord material will be located in the middle lower part of the upper chord material adjacent in the left-right direction, and the shape seen from the stairs inclination direction will show an inverted trapezoid.

<Fourth embodiment>
Each of the truss structures T1 to T3 for the staircases according to the above-described embodiments includes the upper chord material U using a plurality of upper chord frame members 10, 10,. The lower chord material L is configured by using the upper chord material U by using one upper threading material 80 as in the truss structure T4 of the staircase according to the fourth embodiment shown in FIG. The lower chord material L may be configured using one lower threading material 90.

  The staircase according to the fourth embodiment includes a truss structure T4 constructed between the upper floor F2 and the lower floor F1, and a plurality of treads S, S,... Supported by the truss structure T4. Configured.

  As shown in FIGS. 17 (a) and 17 (b), the truss structure T4 includes two upper chord members U, U arranged side by side in the width direction of the tread board S, and each upper chord below the upper chord members U, U. And a plurality of lattice materials 30, 30,... Disposed between the upper chord material U and the lower chord material L. In the embodiment, a plurality of lower chord connecting members 50, 50,... Are arranged between the lower chord members L, L adjacent in the left-right direction, and a plurality of tread plate receiving members are disposed between the upper chord members U, U adjacent in the left-right direction. 100, 100,... Are installed. The truss structure T4 has vertical surfaces on the left and right sides, and has a rectangular shape when viewed from the stairs inclination direction. In addition, since the structure of the lattice material 30 and the lower chord connection material 50 is the same as that of the thing of 1st embodiment, the detailed description is abbreviate | omitted.

  As shown in FIGS. 16 and 17A, each upper chord member U is arranged along the staircase inclination direction with a plurality of upper chord node members 3, 3,... Arranged at equal intervals along the staircase inclination direction. One upper threading member 80.

  As shown in FIG. 17A, two lattice materials 30, 30 adjacent to each other in the staircase inclination direction are connected to the upper chord node member 3. As shown in FIG. 17 (b), the upper chord node member 3 is made of an aluminum alloy casting, forging, or cutting product, and a through hole 3g is formed in the center thereof. Further, mounting surfaces 3e, 3e are formed on the lower chord member L side of the upper chord node member 3, and bolt mounting holes are formed in the mounting surfaces 3e toward the center of the upper chord node member 3. . A connecting bolt 33 attached to the end of the lattice material 30 is screwed into the bolt insertion hole.

  The upper threading member 80 is made of an extruded material made of an aluminum alloy having a groove-shaped cross section that opens to the lower side. A through hole is formed. In the present embodiment, a plurality of upper chord node members 3, 3,... Are fixed in the grooves of the upper threading member 80.

  The lower chord node member 4 is connected to two lattice materials 30, 30 and a lower chord connecting member 50 which are adjacent to each other in the staircase inclination direction. The lower chord node member 4 is made of an aluminum alloy casting, forging, or cutting, and a through hole 4g is formed in the center thereof. Further, mounting surfaces 4 e and 4 e are formed on the upper chord member U side of the lower chord node member 4, and a bolt insertion hole is formed in each mounting surface 4 e toward the center of the lower chord node member 4. . A connecting bolt 33 attached to the end of the lattice material 30 is screwed into the bolt insertion hole. Also, a bolt insertion hole is formed in the side surface of the lower chord node member 4 toward the center of the lower chord node member 4. As shown in FIG. 17 (b), a connecting bolt 53 attached to an end of the lower chord connecting member 50 is screwed into the bolt insertion hole.

  The lower threading member 90 is made of an extruded material made of aluminum alloy having a groove-shaped cross section that opens to the lower side, and an upper wall 91 is omitted in illustration, but there are a plurality of members in accordance with the installation interval of the lower chord node member 4. A through hole is formed. In this embodiment, a plurality of lower chord node members 4, 4,... Are fixed to the upper surface of the lower threading member 90. Here, the reason why the groove of the lower threading member 90 is directed downward is to make it easier to fix the lower chord node member 4 and to prevent dust from accumulating in the groove.

  The tread board receiving material 100 includes a receiving portion 101 made of an aluminum alloy hollow extruded shape, and lid portions 102 and 102 for closing left and right openings of the receiving portion 101. The receiving part 101 has a lower wall 101a that is fixed to the upper surface of the upper threading member 80 in an inclined state with a staircase gradient, and an upper wall 101b on which the tread plate S is placed and fixed. The upper surface of the upper wall 101b is horizontal when the lower wall 101a is fixed to the upper threading member 80.

  In order to fix the upper chord node member 3 to the upper threading member 80, the upper node member 3 is disposed in the groove of the upper threading member 80, and the tread plate receiving material 100 is placed on the upper surface of the upper threading member 80, The mounting bolt 3h is inserted into the through hole 3g of the nodal member 3 from the lower chord member L side, and the shaft portion is further inserted into the through hole of the upper through member 80 and the through hole of the tread plate receiving member 100, and the tread plate receiving member. What is necessary is just to screw a nut in the axial part of the mounting bolt 3h, after making it protrude in the inside of 100. That is, the upper chord node member 3 is fixed to the upper threading member 80 together with the tread plate receiving member 100 by the mounting bolt 3h inserted from the lower chord member U side.

  Further, in order to fix the lower chord node member 4 to the lower threading member 90, the lower node member 4 is placed on the upper surface of the lower threading member 90 and then the upper chord is inserted into the through hole 4 g of the lower node member 4. The mounting bolt 4h is inserted from the material U side, and the shaft portion is inserted into the through hole of the lower threading member 90 so as to protrude into the groove of the lower threading member 90, and then the shaft portion of the mounting bolt 4h. A nut may be screwed onto the nut.

  The staircase according to the present embodiment described above is different from the conventional staircase in which the step board is supported by a heavy member such as a grooved steel or I-shaped steel, and the treads S, S, Because it is a structure that supports ..., there is a bright and open feeling, there is no feeling of pressure even if it is built indoors. Moreover, since the left and right structural surfaces of the truss structure T4 face each other in parallel, it is possible to give the viewer an orthodox impression while being novel.

  Moreover, since this staircase is a structure which fixes each tread board S to the upper chord node member 3 and 3 via the tread board receiving material 100, it is not necessary to arrange | position the lattice material 30 horizontally. That is, the staircase according to the present embodiment has a high degree of freedom in the arrangement of the lattice material 30, and can always arrange the lattice material 30 in a harmonious manner regardless of the magnitude of the staircase gradient.

  Further, the upper chord material U is formed by simply arranging and fixing a plurality of upper chord node members 3, 3,... Since the lower chord material L is constructed simply by arranging and fixing the plurality of lower chord node members 4, 4,... At equal intervals, the manufacture of the truss structure T4 is facilitated. Further, unlike the above-described embodiments, the upper chord material U and the lower chord material L are made of a continuous material, so that the number of connecting portions is small and the structure is simplified.

  Further, since the left and right upper chord members U, U are connected to each other by the tread plate receiving members 100, 100,..., The displacement / deformation in the left / right direction is further reduced. That is, since the bending rigidity in the left-right direction of the entire staircase is improved, it is possible to greatly suppress the rolling when the staircase is raised and lowered. Moreover, since the center part of the tread board S is supported by the tread board receiving material 100, the bending of the tread board S is also reduced.

  Although illustration is omitted, even if the upper chord material U and the lower chord material L of the type shown in FIG. 16 are provided, if the two lower chord materials L, L are arranged below the upper chord materials U, U, the truss The left and right side surfaces of the structure are oppositely reversed, and the shape seen from the direction of the staircase is an inverted trapezoid. The lower chord material L is placed below the middle of the two upper chord materials U and U. For example, the left and right side surfaces of the truss structure face each other in an inverted C shape, and the shape viewed from the direction of the staircase inclination is an inverted triangle.

  The connection structure between each node member and each frame material in each of the above-described embodiments is the same as the so-called ball joint type connection structure known in Japanese Utility Model Laid-open No. 59-194402. If it is a ball joint system, it is possible to use a further improved version.

It is a perspective view of the stairs concerning a first embodiment. It is a side view of the stairs concerning a first embodiment. It is an expansion perspective view for demonstrating the truss structure of the staircase concerning a first embodiment. It is the figure which looked at the truss structure of the staircase which concerns on 1st embodiment from the direction orthogonal to a staircase inclined surface. (A) is an enlarged view of FIG. 2, (b) is the X1-X1 sectional view taken on the line of (a). It is a disassembled perspective view which shows the connection structure of an upper chord node member and an upper chord frame material. It is sectional drawing explaining the procedure which connects an upper chord frame material to an upper chord nodal member, (a) is a figure which shows the state before screwing a connection bolt, (b) is after screwing a connection bolt. It is a figure which shows a state. (A) is a side view showing a state in which a reinforcing plate is attached to the surface of the truss structure, (b) is a cross-sectional view taken along line Y1-Y1 in (a), and (c) is a line Y2-Y2 in (a). It is sectional drawing. It is a perspective view which shows the staircase which concerns on 2nd embodiment. It is an expansion perspective view for demonstrating the truss structure of the staircase concerning 2nd embodiment. (A) is an expanded side view of the truss structure of the staircase concerning 2nd embodiment, (b) is the X2-X2 sectional view taken on the line of (a). It is a perspective view which shows the staircase which concerns on 3rd embodiment. It is an expansion perspective view for demonstrating the truss structure of the staircase concerning 3rd embodiment. It is the figure which looked at the truss structure of the staircase which concerns on 3rd embodiment from the direction orthogonal to a staircase inclined surface. (A) is an enlarged side view of the truss structure of the staircase which concerns on 3rd embodiment, (b) is the X3-X3 sectional view taken on the line of (a). It is a side view of the truss structure of the staircase concerning a fourth embodiment. (A) is an enlarged view of FIG. 16, (b) is the X4-X4 sectional view taken on the line of (a).

Explanation of symbols

T1 to T3 Truss structure U Upper chord material 1 Upper chord node member 10 Upper chord frame member 13 Connection bolt L Lower chord material 2 Lower chord node member 20 Lower chord frame material 23 Connection bolt 30 Lattice material 33 Connection bolt 40 Upper chord connection material 43 Connection bolt 50 Lower string connection Material 53 Connecting bolt 60 Tread plate support frame material 70 Reinforcing plate T4 Truss structure 3 Upper chord node member 80 Upper thread member 4 Lower chord node member 90 Lower thread member 100 Tread plate receiving material S Tread plate R1 Handrail R2 Handrail support R23 Connection bolt

Claims (9)

A truss structure erected between the upper and lower floors;
A stairs comprising a plurality of treads supported by the truss structure,
The truss structure body includes a plurality of upper chord members arranged side by side in the width direction of the tread, and at least one lower chord member disposed in parallel with the upper chord members below the upper chord members. A plurality of lattice members disposed between each upper chord member and each lower chord member;
Each upper chord material has a plurality of upper chord node members arranged at equal intervals,
Each of the lower chord members has a plurality of lower chord node members arranged at equal intervals,
Each lattice material is equipped with connecting bolts at both ends thereof,
Each upper chord node member and each lower chord node member has a bolt insertion hole into which a connection bolt of each lattice material is screwed,
The connection bolt on one end side of each lattice material is screwed into the bolt insertion hole of each upper chord node member, and the connection bolt on the other end side is screwed into the bolt insertion hole of each lower chord node member,
The staircase characterized in that each tread is fixed to each upper chord node member. Each of the upper chord members has one upper threading member arranged along the staircase inclination direction, and the upper chord node members are fixed to the upper thread member,
Each of the lower chord members has one lower threading member arranged along the staircase inclination direction, and the plurality of lower chord node members are fixed to the lower thread member. The staircase according to claim 1. Each of the upper chord members has an upper chord frame member disposed between the upper chord nodal members adjacent to each other in the staircase inclination direction,
Each of the lower chord members has a lower chord frame member disposed between the lower chord node members adjacent to each other in the staircase inclination direction,
The upper chord frame material and the lower chord frame material are provided with connecting bolts at both ends thereof,
Each upper chord node member is formed with a bolt insertion hole into which a connection bolt of each upper chord frame member is screwed.
Each lower chord node member is formed with a bolt insertion hole into which a connecting bolt of each lower chord frame member is screwed.
Each connection bolt of each upper chord frame material is screwed into a bolt insertion hole of each upper chord node member,
The staircase according to claim 1, wherein each connecting bolt of each lower chord frame member is screwed into a bolt insertion hole of each lower chord node member. A plurality of upper chord connecting members are disposed between the adjacent upper chord members,
Each upper chord connecting material is equipped with connecting bolts at both ends thereof,
Each upper chord node member is formed with a bolt insertion hole into which the connecting bolt of each upper chord connecting member is screwed,
4. The stair according to claim 1, wherein each connection bolt of each upper chord connection member is screwed into a bolt insertion hole of each upper chord node member. 5.   The stairs according to any one of claims 1 to 4, wherein each of the treads is placed on each of the upper chord coupling members.   5. The stairway according to claim 1, wherein each of the treads is placed on a tread receiving member that is installed between the upper chord node members adjacent in the left-right direction. The truss structure has two or more lower chord members,
A plurality of lower chord connecting members are disposed between the adjacent lower chord members,
Each lower string connecting material is provided with connecting bolts at both ends thereof,
Each lower chord node member is formed with a bolt insertion hole into which a connecting bolt of each lower chord connecting member is screwed,
The stairs according to any one of claims 1 to 6, wherein each connecting bolt of each lower string connecting member is screwed into a bolt insertion hole of each lower chord node member.   The staircase according to any one of claims 1 to 7, wherein left and right surfaces of the truss structure face each other in an inverted C shape.   The staircase according to any one of claims 1 to 8, wherein a reinforcing plate is attached to a surface of the truss structure.

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