JP2007297863A - Stairs - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide stairs provided with treads arranged around a supporting column and preventing occurrence of displacement caused in an outer peripheral part of the tread without impairing light impression. <P>SOLUTION: This stair is provided with the tread 5 arranged around the supporting column 1, a first bracket 3 supporting the outer peripheral part of the tread 5, and a second bracket 4 supporting an inner peripheral part of the tread 5. The first bracket 3 is provided with a pair of lattice frames 31, 31 overhanging obliquely and upward from a peripheral face of the supporting column 1, and the second bracket 4 is arranged above a terminal part of the first bracket 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to stairs.

  Conventionally, what was disclosed by patent document 1, for example is known as a stairway provided with a tread board arranged around a support.

The staircase includes a step board disposed around the support column, a first bracket that supports the outer periphery of the step board, and a second bracket that supports the inner periphery of the tread. By constructing it with a pair of frames that project horizontally, it has succeeded in giving a light impression to the viewer.
JP 2004-76281 A

  By the way, in this kind of staircase, because of the structure, a large bending moment acts on the base end portion of the frame constituting the first bracket, so that the outer periphery of the first bracket and the tread plate supported by the first bracket is applied. There is a possibility that a large deflection or a shake accompanying the deflection occurs. In order to reduce such bending and shaking, it is necessary to increase the bending rigidity of the frame by increasing the thickness and outer diameter of the frame. However, if the outer diameter or the like of the frame is increased, the frame itself becomes heavier, and there is a possibility that the light impression will fade.

  Moreover, in the staircase of patent document 1, since the structure which mounts the ring member to which the base end part of the flame | frame was connected to a support | pillar is laminated | stacked, the problem that it must be constructed | assembled in an order from the lower stage. There is also a problem that the ring member in the middle stage cannot be easily removed after the stairs are constructed. That is, in the staircase of Patent Document 1, the construction order is limited, and there is a problem that it is difficult to perform maintenance or replacement work after construction.

  Therefore, the present invention provides a staircase including a step board disposed around a support column, and capable of suppressing bending and shaking generated on the outer periphery of the step board without impairing a light impression. In addition, it is an object to provide a staircase in which the construction order is not easily limited and maintenance and replacement work can be easily performed after construction.

  This invention which solves such a subject is provided with a tread plate arranged around a support column, a first bracket that supports the outer peripheral portion of the tread plate, and a second bracket that supports the inner peripheral portion of the tread plate. It is a staircase, and the first bracket includes a pair of lattice frames projecting obliquely upward from the peripheral surface of the support column, and the second bracket is disposed above the proximal end portion of the first bracket. It is characterized by being.

  In short, the present invention is characterized in that a pair of lattice frames projecting obliquely upward from the peripheral surface of the support column supports the outer peripheral portion of the tread board (that is, a portion away from the support column). When the lattice frame is arranged obliquely, bending deformation that occurs in the lattice frame is smaller than when the lattice frame is arranged horizontally. Therefore, even if the lattice frame is not heavy, the bending that occurs in the outer peripheral portion of the tread plate and accompanying the bending It is possible to suppress shaking. That is, according to the present invention, it is possible to suppress bending and shaking generated in the outer peripheral portion of the tread without impairing a light impression.

  In this invention, it is good to arrange | position the said lattice frame which supports the front side of the said tread on the one step in the vertical surface containing the said lattice frame which supports the back side of the said tread. In this way, the appearance of the staircase becomes clean.

  In the present invention, the first bracket may be provided with a connecting frame that connects the tip portions of the pair of lattice frames. If it does in this way, since the space | interval of a pair of lattice frame will be hold | maintained uniformly, the effect which suppresses the vibration of the front-back direction (circumferential direction of a support | pillar) will increase.

  In the present invention, the first bracket may be supported by a base fixed to the outer surface of the support column. That is, you may fix each of a pair of lattice frame which supports the outer peripheral part of a tread to the outer surface of a support | pillar via a base. When such a configuration is adopted, it is not necessary to attach the base and the pair of lattice frames in order from the bottom, so that the construction order is not limited. In addition, since the order of removing the base and the lattice frame is not limited, it becomes easy to perform maintenance and replacement of parts.

  In addition, when arrange | positioning a base on the outer surface of a support | pillar, you may make the said base support the said 2nd bracket. In this way, the first bracket and the second bracket can be integrated via the base, so that the on-site assembly work can be performed easily and quickly.

  When the second bracket is supported by the base, an upper fixing portion fixed to the upper surface of the base, a horizontal fixing portion fixed to a side surface of the base, and the horizontal fixing portion. It is good to provide the support part which protrudes along the lower surface of the said tread. In this case, the inner periphery of the tread may be fixed to the support. If it does in this way, since it becomes possible to couple | bond firmly with a base and a 2nd bracket, the stability of the tread fixed to a 2nd bracket will improve. In addition, since the tread is supported by the support portion located below the upper fixing portion, it is possible to install the tread without a sense of incongruity even when the tread is thick. The upper surface of the upper fixing part may be flush with the upper surface of the tread. If it does in this way, it will become possible to make the external appearance of the connection part of a tread board and a support | pillar clear.

  According to the stairs according to the present invention, it is possible to increase the rigidity of the support structure of the tread without impairing the light impression, and as a result, it is possible to suppress bending and shaking generated on the outer periphery of the tread without impairing the light impression. It becomes possible to do. In addition, the staircase according to the present invention makes it difficult to limit the construction order, and facilitates maintenance and replacement work after construction.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. Note that “front and back” in the present embodiment is based on the time when facing the upward direction of the stairs.

<Overall configuration>
As shown in FIG. 1, the staircase according to the present embodiment includes a support 1, a base 2 fixed to the outer surface of the support 1, a first bracket 3 and a second bracket 4 supported by the base 2, And a tread plate 5 disposed around the support column 1. 2, the staircase according to the present embodiment includes a plurality of first handrail struts 6, 6,... Arranged so as to surround the outer peripheral portions (outer edge portions) of the plurality of treads 5, 5,. And second handrail support columns 7, 7,..., And a handrail 8 arranged so as to connect the upper ends thereof. In addition, in this embodiment, although the staircase (helical staircase) formed by arranging a plurality of treads 5, 5,... Around the support column 1 is illustrated, the purpose of limiting the form of the staircase according to the present invention. is not.

<Support>
As shown in FIG. 3, the column 1 is a pedestal interposed between a column main body 11 erected in the vertical direction and the lower end of the column main body 11 and a staircase mounting portion F <b> 1 on the lower floor (see FIG. 2). And a member 12.

  In this embodiment, the column main body 11 is formed of a hollow aluminum alloy extruded profile having an annular cross section. A plurality (two in this embodiment) of screw holes 11a and 11a are formed in a region A on the outer peripheral surface of the column main body 11 where the base 2 is fixed. Are formed with bottomed screw holes 11b, 11b,. A bolt B21 with a hexagonal hole for fixing the base 2 is screwed into the screw hole 11a on the outer peripheral surface, and a bolt B11 with a hexagonal hole for fixing the base member 12 is screwed into the screw hole 11b on the lower surface. Screwed together. Note that the inside of the column main body 11 may be dense. Although not shown, the outer shape of the column main body 11 may be a polygon.

  The pedestal member 12 is made of a disc made of an aluminum alloy having a diameter larger than that of the column main body 11, and is fixed to the lower end of the column main body 11 by a bolt B11. On the upper surface of the pedestal member 12, a circular recess 12a into which the lower end portion of the column main body 11 is fitted is formed, and a plurality of corresponding recesses 12a corresponding to the plurality of screw holes 11b, 11b,. Bolt insertion holes 12b, 12b,... Are formed. The bolt B11 is inserted through the bolt insertion hole 12b. A plurality of bolt insertion holes 12c, 12c,... Are also formed on the outer peripheral side of the recess 12a. A bolt B12 for fixing the pedestal member 12 to the lower-level stair attachment portion F1 (see FIG. 2) is inserted through the bolt insertion hole 12c.

<Base>
The base 2 consists of a block-shaped member attached to the outer peripheral surface of the support | pillar main body 11, as shown to (a) of FIG. As shown in FIG. 4B, the contact surface 21 of the base 2 with the support body 11 is formed in a cylindrical shape along the outer peripheral surface of the support body 11. The opposite side surface 22 is formed in a flat shape.

  A pair of connecting grooves 22a, 22a are formed in the side surface 22 of the base 2 along the vertical direction. Concavities and convexities are formed on the inner wall surface of the connecting groove 22a. Further, a plurality of (in the present embodiment, two) corresponding to the screw holes 11a, 11a (see FIG. 3) formed in the region A (see FIG. 3) of the column main body 11 between the pair of connecting grooves 22a, 22a. ) Stepped bolt insertion holes 22b, 22b and a bottomed screw hole 22c. A shaft portion of a bolt B21 (see FIG. 3) is inserted into the bolt insertion hole 22b, and a bolt B42 (FIG. 5) with a hexagonal hole for fixing the second bracket 4 (see FIG. 5) is inserted into the screw hole 22c. The shaft portion of (see) is screwed.

  A bottomed screw hole 23 a is formed in the center of the upper surface 23 of the base 2. A countersunk bolt B41 (see FIG. 5) with a hexagonal hole for fixing the second bracket 4 (see FIG. 5) is screwed into the screw hole 23a.

  A plate-like restricting member 24 that prevents the lattice frame 31 (see FIG. 5) from coming out downward is fixed to the lower surface of the base 2.

<First bracket>
As shown in FIG. 5, the first bracket 3 supports the outer peripheral portion of the tread plate 5, a pair of lattice frames 31, 31 projecting from the outer surface of the column 1 via the base 2, and the lattice frame 31. , 31 and a nodal member 33 interposed between the lattice frame 31 and the connecting frame 32. In the present embodiment, the truss is provided together with the base 2. Is forming.

  As shown in FIG. 6A, the lattice frame 31 has a base end connected to the lower portion of the base 2 and projects obliquely upward from the base 2. As shown in FIG. 6 (b), the pair of front and rear lattice frames 31, 31 are arranged in a V shape in plan view, and the interval increases toward the tip side. In FIG. 6B, illustration of the regulating member 24 and the washer 35 is omitted. The lattice frame 31 is obtained by processing a hollow extruded section made of an aluminum alloy having a circular cross section, and has flat connection end portions 31a at both ends thereof as shown in FIGS. 7 (a) and 7 (b). is doing. The connection end portion 31a is formed by crushing the end portion of the hollow extruded shape member by pressing or the like. The connection end 31a can be fitted into a connection groove 22a (see FIG. 7B) of the base 2 and a connection groove 33a (see FIG. 7A) of a node member 33 described later. At the front end portion of 31a, an unevenness that engages with the unevenness of the connecting groove 22a of the base 2 or the unevenness of the connecting groove 33a of the node member 33 described later is formed. By doing so, even if a large axial force (tensile force) is applied to the lattice frame 31, it is not pulled out from the base 2 or the node member 33. Since the connection end portion 31 a is formed in a flat shape that is long in the axial direction of the base 2 and the node member 33, the connection structure between the lattice frame 31 and the node member 33 is the axial direction of the base 2 and the node member 33. The strength against external force (that is, the vertical direction) is high. In addition, the unevenness | corrugation of the connection end part 32a is formed along the direction which makes the angle (alpha) (refer (a) of FIG. 6) with respect to the axis line of the lattice frame 31. As shown in FIG. Thereby, the lattice frame 31 is connected to the base 2 and the node member 33 in a state where the axis thereof is inclined by the angle α with respect to the axis of the base 2 and the node member 33.

  Here, the relationship between the upper and lower adjacent lattice frames 31, 31 will be described in detail with reference to FIG. As shown in this figure, in the present embodiment, a lattice frame 31 that supports the front side of the upper step board 5 is disposed in a vertical plane including the lattice frame 31 that supports the rear side of the step board 5.

  The connection frame 32 is horizontally arranged in the present embodiment, and forms a truss together with the base 2, the pair of lattice frames 31, 31 and the node members 33, 33 as shown in FIG. 5. The connection frame 32 is obtained by processing a hollow extruded section made of an aluminum alloy having a circular cross section, and has a connection end similar to the connection end 31a shown in FIG. Yes. The connection end portion of the connection frame 32 can also be fitted into the connection groove 33a (see FIG. 7A) of the node member 33, and the lattice frame 31 (FIG. Concavities and convexities similar to those in () are formed.

  The node member 33 connects the lattice frame 31 and the connection frame 32, and has a columnar shape as shown in FIG. 8. In this embodiment, two) connecting grooves 33a and 33a are formed. Concavities and convexities are formed on the inner wall surface of the connecting groove 33a along the center line direction (vertical direction in FIG. 8). A bolt insertion hole 33 b is formed on the center line of the node member 33. The node member 33 is made of an extruded shape made of an aluminum alloy, and the connecting groove 33a and the bolt insertion hole 33b are formed when the aluminum alloy is extruded. The node member 33 may be manufactured by casting. Further, the shape of the node member 33 is not limited to that shown in the figure, and may be a polygonal column shape, for example.

  As shown in FIG. 6A, washers 35 are disposed above and below the node member 33. A columnar member 34 is disposed below the node member 33 located on the front side of the two node members 33, 33 constituting the first bracket 3. The columnar member 34 is interposed between the front node member 33 and the tread plate 5 positioned therebelow. In this embodiment, the columnar member 34 is made of an aluminum alloy column having a smaller diameter than the node member 33. A bolt insertion hole (not shown) is formed at the center of the columnar member 34.

  To assemble the first bracket 3, as shown in FIG. 5, the base ends of the pair of lattice frames 31, 31 are connected to the base 2, and the tips of the lattice frames 31, 31 are connected to the node member 33. In addition, the connecting frame 32 may be connected to the node member 33. In order to connect the lattice frame 31 to the base 2, as shown in FIG. 7B, the unevenness formed on the connection end 31 a of the lattice frame 31 from the upper surface side (or lower surface side) of the base 2 is used as the base. It is only necessary to insert into the second connecting groove 22a, and welding or a special tool is not necessary. The method for connecting the lattice frame 31 to the node member 33 and the method for connecting the connecting frame 32 to the node member 33 are the same. A groove filling member (not shown) having the same dimensions and shape as the connection groove 22a is inserted into the connection groove 22a of the base 2 above the connection end 31a of the lattice frame 31. Note that an adhesive or the like may be poured into the gap in order to fill a minute gap generated between the connecting groove 22a and the connection end 31a.

<Second bracket>
The second bracket 4 shown in FIG. 5 supports the inner peripheral portion of the tread plate 5 and is disposed above the base end portion of the first bracket 3. The second bracket 4 includes an upper fixing portion 41 fixed to the upper surface 23 of the base 2, a lateral fixing portion 42 fixed to the side surface 22 of the base 2, and a tension extending from the lateral fixing portion 42 along the lower surface of the tread plate 5. The support part 43 to be taken out is provided.

  The upper fixing part 41 is a part that covers the upper surface 23 of the base 2. As shown in FIG. 9A, the upper fixing portion 41 has a substantially trapezoidal shape in plan view, and its lower surface is smooth so as to be in close contact with the upper surface 23 of the base 2 (see FIG. 9B). It is molded into a flat surface. Further, the inner peripheral edge of the upper fixing portion 41 is formed in an arc shape and comes into contact with the outer peripheral surface of the column 1. As shown in FIG. 5, a through hole 41 a with counterbore is formed in the upper fixing portion 41 at a position corresponding to the screw hole 23 a formed in the upper surface 23 of the base 2. A countersunk bolt B41 is inserted into the insertion hole 41a.

  As shown in FIG. 9B, the lateral fixing portion 42 is a portion that covers the upper half of the side surface 22 of the base 2. In the present embodiment, the lateral fixing portion 42 is attached to the edge of the upper fixing portion 41. It is installed vertically. The lateral fixing portion 42 has a flat plate shape, and the side surface on the base 2 side is formed into a smooth flat surface so as to be in close contact with the side surface 22 of the base 2. The lateral fixing portion 42 includes a thin portion 42a that hangs down from the upper fixing portion 41, and a thick portion 42b that extends below the thin portion 42a. As shown in FIG. 5, a stepped insertion hole 42 c is formed in the thick portion 42 b at a position corresponding to the screw hole 22 c of the base 2. The bolt B42 is inserted into the insertion hole 42c.

  The support portion 43 is a portion that supports the tread board 5. The support portion 43 has a trapezoidal shape in plan view in accordance with the planar shape of the base end portion of the tread plate 5 (see FIG. 9A), and the upper surface thereof is a smooth plane so as to be in close contact with the lower surface of the tread plate 5. It is molded into. As shown in FIG. 9B, the support portion 43 projects horizontally from the upper end portion of the thick portion 42 b of the lateral fixing portion 42, and the upper surface of the support portion 43 is below the upper surface 23 of the base 2. positioned. The support portion 43 is formed with a screw hole 43a. A bolt B51 for fixing the tread plate 5 is screwed into the screw hole 43a.

  The second bracket 4 can be easily manufactured by processing an extruded shape made of an aluminum alloy having a cross section shown in FIG. 9B, but it may be a cast product made of an aluminum alloy or aluminum. It may be manufactured by welding an alloy plate or the like.

  In order to attach the second bracket 4 to the base 2, as shown in FIG. 5, the flat bolt B41 is inserted into the insertion hole 41a of the upper fixing portion 41, and the shaft portion thereof is screwed into the screw hole 23a (see FIG. 4). (See (a)), and further, while inserting the bolt B42 into the insertion hole 42c of the lateral fixing portion 42, the shaft portion is screwed into the screw hole 22c (see (a) of FIG. 4) of the base 2. do it.

<Tread>
The tread board 5 is made of a plate material having a substantially fan shape, and its inner peripheral portion is fixed to the upper surface of the support portion 43 of the second bracket 4 and its outer peripheral portion is fixed to the upper surface of the node member 33 (more specifically, the washer 35). Is done. The end surface 5a on the inner peripheral side of the tread plate 5 is formed in a flat shape and abuts on the thin portion 42a of the lateral fixing portion 42 of the second bracket 4 (see FIG. 9B). A stepped insertion hole 5 c is formed in the inner periphery of the tread plate 5. A bolt B51 is inserted into the insertion hole 5c. An end surface 5b on the outer peripheral side of the step board 5 is formed in an arc shape. An insertion hole 5 d is formed in a corner portion of the outer peripheral portion of the tread plate 5. A long bolt B31 (see FIG. 10A) is inserted through the insertion hole 5d. The tread board 5 may be made of an aluminum alloy, or may be made of iron, wood, or synthetic resin.

<First handrail post>
As shown in FIG. 10A, the first handrail post 6 includes a handrail 61, an upper connection member 62 attached to the upper end of the handrail 61, and a lower connection member 63 attached to the lower end of the handrail 61. In this embodiment, the tread plate 5 is erected on the upper surface.

  In this embodiment, the handrail 61 is made of a hollow aluminum alloy extruded shape having a substantially rectangular outer shape. As shown in FIG. 10B, four screw holes 61a, 61a,... And four groove portions 61b, 61b,. In addition, although illustration is abbreviate | omitted, the external shape of the handrail 61 may be made circular or an ellipse.

  As shown in FIG. 10A, the upper connecting member 62 is interposed between the upper end portion of the handrail 61 and the handrail 8 (see FIG. 2). , A lower protrusion 62b protruding from the lower surface of the flange 62a, an upper protrusion 62c protruding obliquely from the upper surface of the flange 62a, and an upper end of the upper protrusion 62c The mounting part 62d provided in the. The lower protrusion 62 b is formed in a shape that can be inserted into the handrail 61. Further, the mounting portion 62d is formed in a shape that can contact the lower surface of the handrail 8. In order to fix the upper connecting member 62 to the upper end portion of the handrail 61, the lower protrusion 62b is inserted into the handrail 61 and then passes through the lower protrusion 62b from the side surface of the handrail 61. What is necessary is just to screw in the tapping screw B62 to do.

  The lower connecting member 63 is interposed between the lower end portion of the handrail 61 and the node member 33, and has a base portion 63 a that abuts on the upper surface of the node member 33, and projects from the upper surface of the base portion 63 a. And an insertion portion 63c. The base 63a is formed in a disk shape having the same outer diameter as the node member 33, and is located at a position corresponding to the screw holes 61a, 61a,... (See FIG. 10 (b)) of the handrail 61. As shown in FIG. 10C, insertion holes 63b, 63b,... Are formed. A tapping screw B63 (see FIG. 10A) for fixing the lower connecting member 63 to the lower end of the handrail 61 is inserted into the insertion hole 63b. The insertion portion 63c is formed in a shape that can be inserted into the handrail 61, and an engaging projection 63d that engages with the groove portion 61b of the handrail 61 is formed on the outer peripheral portion thereof. Further, a screw hole 63e is formed at the center of the insertion portion 63c. A long bolt B31 (see FIG. 10A) inserted through the bolt insertion hole 33b (see FIG. 8) of the node member 33 is screwed into the screw hole 63e. In order to fix the lower connecting member 63 to the lower end portion of the handrail 61, after inserting the insertion portion 63c into the handrail 61, the tapping screw B63 is inserted into the insertion hole 63b of the base portion 63a, and the tip thereof The portion may be screwed into the screw hole 61a of the handrail 61.

<Second handrail support>
As shown in FIG. 11, the second handrail post 7 includes a handrail 71 and an upper connection member 72 attached to the upper end of the handrail 71. In this embodiment, the second handrail post 7 is screwed from the lower side of the tread plate 5. The tapping screw B71 is erected and fixed on the upper surface of the outer peripheral portion of the tread plate 5. In addition, since the structure of the handrail 71 and the upper connection member 72 is the same as that of the handrail 61 and the upper connection member 62 shown to (a) of FIG. 10, the detailed description is abbreviate | omitted.

<Handrail>
2 is arranged so as to sew a plurality of first handrail struts 6, 6,... And second handrail struts 7, 7,..., And in this embodiment, bending is performed in a spiral shape. Made of extruded aluminum alloy. In addition, in order to fix the handrail 8 to the upper end part of the 1st handrail support | pillar 6, after making the attachment part 62d of the upper connection member 62 shown to (a) of FIG. A tapping screw (not shown) may be screwed in from the lower surface of 62d. The same applies to the case where the handrail 8 is fixed to the upper end portion of the second handrail post 7.

<How to build stairs>
Next, a method for constructing stairs configured as described above will be described. First, the column 1 is erected and fixed to the staircase mounting portion F1 on the lower floor (see FIG. 2). In addition, in order to fix the support | pillar 1 to the staircase attachment part F1 of the lower floor, as shown in FIG. You just screw in the right place.

  Subsequently, as shown in FIG. 1, the step board units U, U,... Including the base 2, the first bracket 3, the second bracket 4 and the tread board 5 are attached to the outer peripheral surface of the support column 1, and the lower tread board 5 The lattice frame 31 that supports the rear side and the lattice frame 31 that supports the front side of the step board 5 on the upper level (that is, the lattice frames 31 and 31 in the same vertical plane) are connected to each other. In order to connect the lattice frames 31, 31 in the same vertical plane, a columnar member 34 is interposed between the node member 33 to which the upper lattice frame 31 is connected and the lower tread 5, After the first handrail support column 6 is erected on the upper surface of the upper step board 5, a long bolt B31 is attached to the lower node member 33, the lower step board 5, the columnar member 34, the upper node member 33, and the upper step board 5. The nut N31 (see FIG. 10 (a)) may be screwed and tightened to the lower end of the long bolt B31. In addition, the cap 36 which covers these is attached to the lower end part of the long volt | bolt B31, and nut N31.

  Then, as shown in FIG. 2, a landing L is installed between the support column 1 and the staircase attachment portion F <b> 2 on the upper floor, and the second handrail support columns 7, 7,. When the handrail 8 is attached to the upper ends of the first handrail struts 6, 6,... And the second handrail struts 7, 7,.

  The step board unit U shown in FIG. 1 may be assembled at the construction site, but if assembled in advance in a factory or the like, the work at the construction site becomes even easier.

  Further, the mounting order of the corrugated board unit U is preferably attached in order from the lower stage, but is not limited to this, and may be attached in order from the upper stage or from the middle stage.

  As described above, the staircase according to the present embodiment is characterized in that the outer peripheral portion of the tread plate 5 is supported by the pair of lattice frames 31, 31 protruding obliquely upward from the peripheral surface of the support column 1. When the lattice frame 31 is arranged obliquely, bending deformation generated in the lattice frame 31 is reduced as compared with the case where the lattice frame 31 is arranged horizontally. Therefore, even if the lattice frame 31 is not made heavy, It is possible to suppress shaking. That is, according to the staircase according to the present embodiment, it is possible to suppress bending and shaking generated in the outer peripheral portion of the tread plate 5 without impairing a light impression.

  In the staircase according to the present embodiment, the lattice frame 31 that supports the front side of the upper step board 5 is disposed in the vertical plane including the lattice frame 31 that supports the rear side of the step board 5, so that the appearance of the staircase is clean. It has become.

  In the staircase according to the present embodiment, the distance between the pair of lattice frames 31, 31 is kept constant by connecting the tip portions of the pair of lattice frames 31, 31 with the connection frame 32. The effect which suppresses the shaking of (the circumferential direction of a support | pillar) increases.

  In the present embodiment, since the first bracket 3 and the second bracket 4 are assembled to the base 2 and the base 2 is fixed to the outer surface of the support column 1, the base 2, the first bracket 3, and the like are sequentially installed from the bottom. There is no need to install. In addition, since the order of removing the base 2 is not limited, it becomes easy to perform maintenance and replacement of parts. When only the tread plate 5 is removed, the long bolt B31 shown in FIG. 10 is detached from the lower connection member 63 of the first handrail post 6, and the tapping screw B71 shown in FIG. The bolt B51 shown in FIG. 5 may be detached from the second bracket 4.

  In the present embodiment, the base 2, the first bracket 3, the second bracket 4 and the tread plate 5 are integrated to form the stepped plate unit U, so that the assembly work at the site can be performed easily and quickly. In the present embodiment, the construction method in which the step board unit U is fixed to the outer peripheral surface of the support column 1 is illustrated. However, after fixing the plurality of bases 2, 2,. A construction method may be adopted in which the first bracket 3 and the second bracket 4 are connected to each other, and the tread plate 5 is then installed. In addition, when fixing the 2nd bracket 4 to the base 2 after fixing the base 2 to the support | pillar 1, although illustration is abbreviate | omitted, you may increase the bolt penetration hole 22b of the base 2. FIG. That is, in the base 2 shown in FIG. 4, two bolt insertion holes 22b and 22b are formed on the lower side of the screw hole 22c. In addition to this, a position where the second bracket 4 is installed (for example, a screw) A bolt insertion hole 22b may be formed in the upper side of the hole 22c).

  In the present embodiment, since the second bracket 4 is fixed to the upper surface and the side surface of the base 2, the coupling strength is high, and therefore the stability of the tread 5 fixed to the second bracket 4 is also high. Further, when the tread board 5 is made of wood or synthetic resin, it is necessary to increase its thickness as compared with the case where it is made of aluminum alloy or iron, but the support located below the upper fixing portion 41 is required. Since the tread plate 5 is supported by the portion 43, the tread plate 5 can be installed without a sense of incongruity even when the tread plate 5 is thick. Note that the top surface of the tread plate 5 can be flush with the top surface of the upper fixing portion 41 by adjusting the position of the support portion 43 according to the thickness of the tread plate 5.

  Furthermore, in this embodiment, since the columnar member 34 is interposed between the node member 33 and the tread 5, the load acting on one tread 5 is attached to the first bracket 3 that supports the tread 5 above and below it. Will be distributed. That is, according to the stairs according to the present embodiment, the lattice frame 31 and the like can be made lighter than when the columnar member 34 is not interposed.

  Moreover, in the staircase according to the present embodiment, the nodal members 33 and 33, the columnar member 34, and the first handrail support column 6 that are vertically adjacent to each other are arranged in a straight line, so that the appearance of the staircase becomes clean.

  The configuration of the staircase described above may be changed as appropriate. For example, in the above-described embodiment, the case where the first bracket 3 and the second bracket 4 are fixed to the support column 1 via the base 2 is illustrated, but the present invention is not limited to this, and the illustration is omitted. The base 2 may be omitted and the first bracket 3 and the second bracket 4 may be directly fixed to the support column 1.

  Further, in the above-described embodiment, the configuration in which the pair of lattice frames 31 and 31 are coupled by the coupling frame 32 is illustrated, but the coupling frame 32 may be omitted. Further, in the above-described embodiment, the configuration in which the columnar member 34 is interposed between the node member 33 and the tread plate 5 is illustrated, but the columnar member 34 may be omitted.

  In the above-described embodiment, the configuration in which the lattice frame 31 and the connection frame 32 are connected via the node member 33 is illustrated. However, the lattice frame 31 and the connection frame 32 are directly joined using means such as welding. There is no problem.

  Moreover, although the case where the 2nd handrail support | pillars 7 and 7 were arrange | positioned between the 1st handrail support | pillars 6 and 6 was illustrated in above-described embodiment, the 2nd handrail support | pillar support | pillars 7 and 7 may be abbreviate | omitted. In this case, as shown in FIG. 12, a plurality of linear members 9, 9,... The linear member 9 is inserted through a through hole (not shown) provided in the first handrail column 6.

It is a perspective view which shows a part of staircase which concerns on embodiment of this invention. It is a perspective view which shows the whole staircase which concerns on embodiment of this invention. It is a disassembled perspective view for demonstrating the structure of a support | pillar. (A) is a perspective view which shows a base, (b) is a top view of a base. It is a perspective view for demonstrating a 1st bracket and a 2nd bracket. (A) is a front view for demonstrating a 1st bracket, (b) is a bottom view of (a). (A) is a perspective view for demonstrating the connection method of a lattice frame and a node member, (b) is a perspective view for demonstrating the connection method of a lattice frame and a base. It is a perspective view which shows a nodal member. (A) is a front view for demonstrating a 2nd bracket, (b) is a top view similarly. (A) is a disassembled perspective view for demonstrating the structure of a 1st handrail support | pillar, (b) is an enlarged perspective view of a handrail, (c) is an enlarged perspective view of a lower connection member. It is a disassembled perspective view for demonstrating the structure of a 2nd handrail support | pillar. It is a perspective view which shows the whole staircase which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support | pillar 2 Base 3 1st bracket 31 Lattice frame 32 Connection frame 33 Node member 4 2nd bracket 41 Upper fixed part 42 Lateral fixed part 43 Support part 5 Tread board 6 First handrail support pillar 7 Second handrail support pillar 8 Handrail

Claims (7)

A tread placed around the column,
A first bracket that supports the outer periphery of the tread;
A second bracket that supports the inner periphery of the tread, and a staircase comprising:
The first bracket comprises a pair of lattice frames projecting obliquely upward from the peripheral surface of the support column,
The staircase characterized in that the second bracket is disposed above a proximal end portion of the first bracket.   2. The staircase according to claim 1, wherein the lattice frame that supports the front side of the upper tread is arranged in a vertical plane including the lattice frame that supports the rear side of the tread.   3. The staircase according to claim 1, wherein the first bracket includes a connection frame that connects tip portions of the pair of lattice frames. 4. A base fixed to the outer surface of the column;
The staircase according to any one of claims 1 to 3, wherein the first bracket is supported by the base.   The staircase according to claim 4, wherein the second bracket is supported by the base. The second bracket includes an upper fixing portion that is fixed to the upper surface of the base, a horizontal fixing portion that is fixed to a side surface of the base, and a support portion that projects from the horizontal fixing portion along the lower surface of the tread. Has
The staircase according to claim 5, wherein an inner peripheral portion of the tread is fixed to the support portion.   The staircase according to claim 6, wherein an upper surface of the upper fixing portion is flush with an upper surface of the tread board.

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