JP6706916B2 - Girder members and structure of stairs - Google Patents

Description

The present invention relates to a stair girder member and a girder structure.

Instead of supporting side girders (Sasara girders) arranged on both sides in the width direction, one or two (or more) support girders are arranged at the center in the width direction and spaced apart in the width direction. Then, a staircase structure (open staircase) in which a tread is placed and fixed thereon is disclosed in Patent Documents 1 and 2 below.

The staircase described in Patent Document 1 includes a tread plate 6 and a supporting member 1 thereof, and the supporting member 1 has a tread mounting portion 1a, a horizontal member 2, a front side connecting part 3 and a rear side connecting part 4, and a front side. The connecting portion 3 is connected to the rear connecting portion 4 of the lower support member 1.

The tread supporting girder for stairs described in Patent Document 2 has supporting units 1, 2 and 3 composed of tread mounting parts 1a, 2a and 3a, a first member 4 and a second member 5, and is provided with a first member 4. The second member 5 is connected to form a series of girders.

JP, 2003-213866, A JP-A-5-340049

However, in the conventional staircase structure or girder structure described in Patent Documents 1 and 2, there is no means for adjusting the position between the adjacent treads in the front-back direction and the height direction. For this reason, it is difficult to cope with the case where treads having different widths are placed or the case where the dimensional accuracy of each member is poor.

That is, in Patent Document 1, from the lower end of the rear connecting portion 4 in a state where the rear connecting portion 4 supporting the lower stepping plate 6 is externally fitted below the front side connecting portion 3 supporting the upper stepping plate 6, Since the structure is such that the bolt 5 is inserted and screwed into the female screw portion 6a on the back surface of the tread plate to fix the tread plate 6 (FIG. 3), the height between the upper and lower tread plates 6, 6 depends on the length of the bolt 5. It is fixed and cannot be adjusted. In addition, the distance in the front-rear direction is constant because it is constant depending on the length of the horizontal member 2 that connects the front connecting portion 3 and the rear connecting portion 4 in the horizontal direction (front-rear direction).

In Patent Document 2 as well, the height interval and the front-rear interval between the treads are uniformly determined by the dimensions of the members forming the support units 1, 2, and 3, and therefore cannot be adjusted.

Therefore, the problem to be solved by the present invention is to provide a girder member and a girder structure capable of adjusting the front-back direction and the height direction between adjacent treads, thereby using treads of different widths. Also, it is an object of the present invention to facilitate the construction corresponding to this, and also to easily cope with the case where the dimensional accuracy of each member is not good.

In order to solve this problem, the invention according to claim 1 of the present application is a girder member that constitutes a stair girder structure, and has a tread support member having an upper end with a tread support plate that supports the tread, and an upper step tread. A connecting member for connecting the supporting member and the lower stepping plate supporting member so that the height can be adjusted and the front and rear can be adjusted, and one member of the treading plate supporting member and the connecting member has a tubular portion and the other member. Since the member has the shaft portion that is slidably fitted to the tubular portion in the height direction, the connecting member and the tread support member are connected so that the height can be adjusted, and the other member having the shaft portion is A pair of parallel projections are provided which project laterally and extend axially, and one of the members having the cylindrical portion has a slit extending axially and can hold the projecting pieces on both sides thereof. A piece is provided, and a fastening member insertion hole is formed in both the projecting piece and the parallel projecting piece, one of which is formed as a round hole having an inner diameter substantially equal to the shaft diameter of the fastening member and the other of which is the shaft of the fastening member. It is characterized in that it is formed as a laterally elongated hole having a width dimension larger than the diameter, and the coupling member and the tread support member are coupled so as to be adjustable in the front-rear direction through a fastening member inserted through the round hole and the laterally elongated hole .

The invention according to claim 2 of the present application is the girder member according to claim 1 , further comprising a floor surface fixing member for fixing a tread support member supporting the bottom tread to the floor surface of the lower floor, and a top tread. And a wall surface fixing member for fixing a tread support member supporting the wall surface to a wall surface.

The invention according to claim 3 of the present application is a girder structure configured using the girder member according to claim 1 or 2 .

According to the invention of claim 1, adjacent tread support members can be positionally adjusted in the front-rear direction and the height direction via the connecting member, so that the treads of different widths can be used. The above construction is easy, and it is possible to easily deal with the case where the dimensional accuracy of each member is not good.

Further, since the connecting member and the tread supporting member are connected by inserting the screw into the round hole and the elongated hole and tightening the screw, the front and rear adjustment is easy.

Further, since the plate-shaped projecting piece is clamped between the parallel projecting pieces and fastened by the bolt, the connecting member and the tread supporting member are connected, so that a strong connecting structure can be obtained.

Further, when the connecting member and the tread supporting member are connected, by tightening the bolt, the tubular portion can be reduced in diameter and the connecting strength with respect to the tread supporting member can be increased, so that a stronger connecting structure can be obtained. can get.

According to the second aspect of the present invention, the floor plate fixing member is used to fix the lowermost step plate supporting member to the floor surface of the lower floor, and the wall surface fixing member is used to fix the uppermost step plate supporting member to the wall surface. Therefore, the girder structure can be easily constructed using these girder members.

According to the invention of claim 3 , a girder structure constructed using these girder members can be obtained. According to this girder structure, since the adjacent tread support members can be positionally adjusted in the front-rear direction and the height direction via the connecting member, even when using treads of different widths, the construction corresponding thereto can be performed. It is easy, and it is possible to easily deal with the case where the dimensional accuracy of each member is not good.

It is a side view of a staircase structure having a girder member and a girder structure according to an embodiment (Example 1) of the present invention. It is a side view which divides and shows this stair structure for every girder structure constituent member (girder member). It is a side view (a), a front view (b), a rear view (c), a plan view (d) and a bottom view (e) each showing a tread support member used in this staircase structure. It is a side view (a), a front view (b), a rear view (c), a plan view (d) and a bottom view (e) each independently showing a tread support member that supports the bottom tread of this staircase structure. It is a side view (a), a front view (b), a rear view (c), a plan view (d), and a bottom view (e) which show the connecting member used for this staircase structure independently. It is a side view (a), a front view (b), a rear view (c), a plan view (d) and a bottom view (e) each showing a floor fixing member used in this staircase structure. It is the side view (a), front view (b), rear view (c), top view (d) and bottom view (e) which independently show the wall surface fixing member used for this staircase structure. It is a side view (a), a top view (b), and a bottom view (c) which show a connected state of a footboard support member and an up-and-down girder connection member in this staircase structure. It is a side view of a stair structure having a girder member and a girder structure according to another embodiment (Example 2) of the present invention. It is a side view which divides and shows this stair structure for every girder component member (girder member). It is a side view (a), a front view (b), a rear view (c), a plan view (d) and a bottom view (e) each showing a tread support member used in this staircase structure. It is a side view (a), a front view (b), a rear view (c), a plan view (d), and a bottom view (e) each showing an upper and lower girder connecting member used in this staircase structure. It is a side view (a), a front view (b), a rear view (c), a plan view (d) and a bottom view (e) each showing a floor fixing member used in this staircase structure. It is the side view (a), front view (b), rear view (c), top view (d) and bottom view (e) which independently show the wall surface fixing member used for this staircase structure. It is a side view (a), a top view (b), and a bottom view (c) which show a connected state of a footboard support member and an up-and-down girder connection member in this staircase structure. It is a top view which shows the embodiment which applied the staircase structure by this invention (Example 1) to a circular staircase. It is each top view which shows that width can be adjusted in connection of the step board support member and the upper and lower girder connection member in this staircase structure.

The present invention will be described in detail below with reference to examples.

FIG. 1 is a side view of a staircase structure 10 according to an embodiment (Example 1) of the present invention, and FIG. 2 is a side view showing the staircase structure 10 divided into girder constituent members. This staircase structure 10 supports a plurality of treads (three treads 11a to 11c are shown for simplification. If there is no particular need to distinguish them, they are collectively denoted by reference numeral 11). Have.

The girder structure 20 includes tread support members 21a to 21c (which are collectively referred to by reference numeral 21 when there is no particular need to distinguish them) for supporting the treads, and adjacent tread support members in the front-rear direction and the vertical direction, respectively. The connecting members 22a and 22b which are connected at a predetermined interval (these are collectively referred to by the reference numeral 22 when there is no particular need to distinguish them) and the tread supporting member 21a which supports the lowermost tread 11a are attached to the floor of the lower floor. It has a floor surface fixing member 23 fixed to No. 1 and a wall surface fixing member 24 fixing the tread supporting member 21c supporting the uppermost tread 11c to the wall surface 2.

The tread support members 21b and 21c that support the middle tread 11b and the uppermost tread 11c have the same configuration. That is, as shown in FIG. 3, these tread supporting members 21 have a cylindrical portion having a tread fixing plate 25 at the upper end and an external thread 26 engraved and formed at least over a predetermined length region on the lower end side. 27 and a vertical plate 28 projecting from the upper end of the cylindrical portion 27 in one direction, and are integrally formed. The tread plate fixing plate 25 is formed with a screw hole 29 for fixing the tread plate 11 placed on the tread plate fixing plate 25 with a screw (not shown). Further, the vertical plate 28 has bolt insertion slots 30 formed in parallel at two upper and lower positions.

The tread supporting member 21a that supports the bottom tread 11a has substantially the same structure as the above-mentioned tread supporting members 21b and 21c, but there is no tread supporting member on the lower side, and therefore, a connecting member that connects the tread supporting members 21a and 21c. As shown in FIG. 4, the cylindrical portion 27 is short because it does not require a connecting portion for. A female screw 31 for connecting to the floor surface fixing member 23 is formed at the lower end of the tread support member 21a.

The connecting members 22 (22a, 22b) have the same structure. That is, as shown in FIG. 5, each connecting member 22 has a cylindrical portion 33 having a female screw 32 formed by engraving over at least a predetermined length region on the upper end side, and one side direction from the cylindrical portion 33. It has a projecting piece 34 protruding and is integrally formed. In this embodiment, a slit 45 is formed in a part of the cylindrical portion 33, and a pair of pieces from both ends facing the slit 45 are a pair of pieces protruding in parallel in one direction with a gap between them. It is formed as a parallel protrusion 34. The cylindrical portion 33 has an inner diameter that is substantially the same as or slightly larger than the outer diameter of the cylindrical portion 27 of the tread support member 21, and is capable of fitting the cylindrical portion 27, and in this fitted state, the male screw of the cylindrical portion 27 is 26 and the female screw 32 of the cylindrical portion 33 are screwed together to be connected to the tread support member 21 on the upper stage side. Bolt insertion holes 35 are formed in the upper and lower two stages in the parallel projecting piece 34. With the vertical plate 28 of the tread support member 21 inserted in the gap between the projecting pieces 34, the bolt 36 (FIG. 1) is inserted into the projecting piece 34. The bolt insertion hole 35 and the bolt insertion slot 30 of the vertical plate 28 are passed through and screwed to a nut (not shown) on the opposite side to be connected to the tread support member 21 on the lower side (FIG. 8 ).

The connecting member 22 includes a tread support member that supports the lower tread (for example, a tread support member 21b that supports the tread 11b) and a tread support member that supports the upper tread (for example, the tread support member 21c that supports the tread 11c). And are connected to each other by adjusting the intervals in the vertical direction and the front-back direction. That is, as described above, in the state in which the cylindrical portion 27 of the upper step side tread support member 21c is fitted into the cylindrical portion 33 of the connecting member 22 therebelow, the male screw 26 and the cylindrical portion 33 of the cylindrical portion 27 are The vertical gap can be adjusted by screwing with the female screw 32, and one of the holes for inserting the bolt 36 (in this embodiment, the bolt inserting hole 35 of the projecting piece 34) has a shaft diameter of the bolt 36. It is possible to adjust the distance in the front-back direction by forming it as a round hole having an inner diameter that substantially matches the above, and by forming the other (in this embodiment, the bolt insertion slot 30 of the vertical plate 28) as a slot long in the lateral direction. Is. FIG. 17A shows a case where the front-rear spacing between adjacent tread support members 21 in this embodiment (hence the front-back spacing between treads) is minimized, and FIG. 17B shows the same spacing in the middle. (C) shows the case where the same interval is maximized, and the front-rear distance can be easily adjusted by moving the insertion position of the bolt 36 within the range of the bolt insertion slot 30 of the vertical plate 28.

The floor fixing member 23 is not particularly limited in structure as long as it can fix the tread supporting member 21a (FIG. 4) supporting the lowermost tread 11a to the floor 1 of the lower floor so that the height of the tread supporting member 21a (FIG. 4) can be adjusted. However, in this embodiment, the floor surface fixing plate 37 fixed to the floor surface and the cylindrical portion 38 standing upright are integrally formed, and the cylindrical portion 38 has the same structure. A male screw 39 is formed at least over a predetermined length region on the upper end side. Then, after the floor surface fixing plate 37 is fixed to the floor surface 1 of the lower floor by driving a screw (not shown) into the floor surface 1 of the lower floor from the screw hole 40 of the floor surface fixing plate 37, the tread support member 21a In the state where the cylindrical portion 38 of the floor surface fixing member 23 is fitted in the cylindrical portion 27, the female screw 31 of the cylindrical portion 27 and the male screw 39 of the cylindrical portion 38 are screwed to each other, whereby the lowermost step plate supporting member 21a. (Thus, the tread 11a supported on it) can be fixed to the floor 1 of the lower floor at a predetermined height. In this embodiment, a female screw 31 is formed on the cylindrical portion 27 of the lowermost step support member 21a and is screwed onto the male screw 39 of the cylindrical portion 38 of the floor surface fixing member 23. Similarly to the tread support members 21b and 21c, the embodiment in which the male screw is formed on the cylindrical portion 27 of the lowermost step support member 21a and the female screw formed on the cylindrical portion of the floor fixing member 23 is screwed together. You may adopt it.

The wall fixing member 24 is not particularly limited in configuration as long as it can fix the tread supporting member 21c (FIG. 3) supporting the uppermost step tread 11c to the wall 2 so as to be adjustable in the front and rear direction. In the embodiment, the wall surface fixing plate 41 fixed to the wall surface and the parallel projecting piece 42 projecting from one surface thereof are integrally formed. The parallel projecting piece 42 has substantially the same configuration as the parallel projecting piece 34 of the connecting member 22, and is composed of a pair of pieces extending in parallel with a predetermined gap between them, and the bolt insertion holes 43 are vertically arranged through these pieces. It is formed in two steps. Then, after fixing the wall surface fixing plate 41 to the wall surface 2 by driving a screw (not shown) into the wall surface 2 from the screw hole 43 of the wall surface fixing plate 41, the vertical plate of the uppermost step plate supporting member 21c is inserted in the gap of the projecting piece 42. By inserting the bolt 36 (FIG. 1) through the bolt insertion hole 43 of the projecting piece 42 and the bolt insertion long hole 30 of the vertical plate 28 with the bolt 28 inserted, and screwing it into a nut (not shown) on the opposite side. The uppermost tread support member 21c can be fixed to the wall surface 2.

A method of constructing the stair structure 10 and the girder structure 20 described above will be described. After fixing the floor surface fixing member 23 to the floor surface 1 of the lower floor by driving a screw into the floor surface 1 of the lower floor from the screw hole 40 of the floor surface fixing plate 37, the floor is fixed on the cylindrical portion 27 of the lowermost step support member 21a. In a state where the cylindrical portion 38 of the surface fixing member 23 is fitted, the height of the lowermost step plate supporting member 21a is adjusted by screwing the female screw 31 of the cylindrical portion 27 and the male screw 39 of the cylindrical portion 38. To fix. Next, the cylindrical portion 27 of the middle step plate supporting member 21b that supports the tread 11b is fitted into the cylindrical portion 33 of the connecting member 22a, and the heights of these are adjusted by screwing the male screw 26 and the female screw 32. And connect them. Then, with the vertical plate 28 of the lowermost step plate supporting member 21a fixed to the floor 1 of the lower floor inserted in the gap of the parallel projecting piece 34 of the connecting member 22a, the bolt 36 is inserted into the bolt inserting hole of the projecting piece 34. 35 and the vertical plate 28 is passed through the bolt insertion slot 30 and screwed to a nut (not shown) on the opposite side, so that the connecting member 22a is adjusted to the front and rear within the range of the bolt insertion slot 30 and the lowermost step plate. It connects with the support member 21a.

In this embodiment, the slit 45 is formed in the cylindrical portion 33 of the connecting member 22a, and the vertical plate 28 is sandwiched between a pair of pieces of the projecting piece 34 to be bolted. Therefore, as the bolt is tightened, the slit 45 closes. In addition to the screwing of the male screw 26 and the female screw 32, a strong fitting state can be obtained between the cylindrical portions 27 and 33, and a fixing structure with high strength can be obtained. When the diameter of the cylindrical portion 33 is reduced by tightening the bolts, or when a force is applied to the cylindrical portion 33 after the tread support member 21 and the connecting member 22 are connected, the cylindrical portion 33 is distorted or twisted. In order to prevent this from occurring, flanges 34a, 34b extending horizontally in a predetermined width are formed at the upper and lower ends of each of the pieces constituting the protruding piece 34 (FIG. 5). Also for the wall surface fixing member 24, when the uppermost step plate supporting member 21c is fixed with the vertical plate 28 of the uppermost step plate supporting member 21c sandwiched in the gap between the pieces forming the projecting piece 42, the bolts are tightened. When the diameter of the cylindrical portion 33 is reduced, or when a force is applied to the cylindrical portion 33 after the tread supporting member 21 and the connecting member 22 are connected, the wall fixing plate 41 fixed to the wall surface 2 is distorted. In order to prevent the occurrence of bending or bending, flange portions 42a and 42b extending in the horizontal direction with a predetermined width are similarly formed at the upper and lower ends of each piece constituting the protruding piece 42 (FIG. 7).

Repeat this work for the number of steps on the stairs. Then, the uppermost step support member 21c is fixed to the wall surface 2 by the wall surface fixing member 24. As described above, this work is performed by driving a screw (not shown) into the wall surface 2 from the screw hole 44 of the wall surface fixing plate 41 to adjust the height between the floor surface 3 of the upper floor and the wall surface. After fixing the fixing member 24 to the wall surface 2, the bolt 36 (FIG. 1) is inserted into the bolt insertion hole 43 of the projecting piece 42 and the vertical plate 28 of the uppermost step board supporting member 21c in the gap of the projecting piece 42. This can be performed together with the front-rear adjustment by passing through the bolt insertion slot 30 of the plate 28 and screwing it into a nut (not shown) on the opposite side. After constructing the girder member 20 in this manner, the tread 11 is placed and fixed on each tread supporting member 21, and the stair structure 10 is obtained.

The staircase structure 10 and the girder structure 20 as described above can be applied to the straight staircase and the turning staircase. FIG. 16 shows an embodiment applied to a turning staircase. Since the tread supporting member 21 on the upper stage side is connected to the connecting member 22 through the screwing of the male screw 26 of the cylindrical portion 27 of the tread supporting member 21 and the female screw 32 of the cylindrical portion 33 of the connecting member 22, It is possible and easy to install the vertically adjacent tread support members 21 at any rotation angle. Note that the front end corners of the tread plate fixing plate 25 are chamfered to support the tread plates (the tread plates 11c to 11e in FIG. 16) that constitute the twirl part when applied to the staircase as shown in FIG. This is to prevent the tread plate fixing plate 25 of the tread support member 21 (the tread support members 21c to 21e in FIG. 16) from exceeding the step nose (front end face) of the tread.

FIG. 9 is a side view of a staircase structure 50 according to another embodiment (Example 2) of the present invention, and FIG. 10 is a side view showing the staircase structure 50 divided into girder constituent members. In this staircase structure 50, a girder structure 60 that supports a plurality of treads (three treads 51a to 51c are shown for simplification. These are collectively denoted by reference numeral 51 when there is no particular need to distinguish them). Have.

The girder structure 60 includes tread support members 61a to 61c (which are collectively denoted by reference numeral 61 when there is no particular need to distinguish them) for supporting the treads, and adjacent tread support members in the front-rear direction and the up-down direction, respectively. The connecting members 62a to 62c which connect at predetermined intervals (these are collectively referred to as reference numeral 62 when there is no particular need to distinguish them) and the tread supporting member 61a which supports the lowermost tread 51a are connected to the floor of the lower floor. 1, a floor surface fixing member 63, and a wall surface fixing member 64 for fixing a tread support member 61c supporting the uppermost step plate 51c to the wall surface 2.

The tread support members 61 (61a to 61c) have substantially the same configuration. That is, as shown in FIG. 11, these tread supporting members 61 have a tread fixing plate 65 at the upper end and have a male screw 66 extending over at least a predetermined length region (all axial lengths in this embodiment) on the lower end side. It has a cylindrical portion 67 and a parallel projecting piece 68 projecting from the upper end of the cylindrical portion 67 in one direction, and is integrally formed. The cylindrical portion 67 is formed with a slit 85 into which the tip of the vertical plate 74 of the connecting member 62 sandwiched between the parallel protrusions 68 is inserted. The slit 85 is formed over at least the range capable of accommodating the tip portion of the vertical plate 74, but may be formed so as to extend from the upper end to the lower end of the cylindrical portion 67. The tread plate fixing plate 65 is formed with a screw hole 69 for fixing the tread plate 51 placed thereon with a screw (not shown). The parallel projecting piece 68 is composed of a pair of pieces protruding in parallel in one direction with a gap between them, and bolt insertion holes 70 are formed at two upper and lower positions through these pieces. In addition, regarding the tread support member 61a that supports the bottom tread 51a, the tread support member does not exist on the lower side, and therefore, a connecting portion for a connecting member that connects to the lower tread support member is not required. It is formed short (not shown).

The connecting members 62 (62a, 62b) have the same structure. That is, as shown in FIG. 12, each coupling member 62 has a cylindrical portion 73 having a female screw 72 extending over at least a predetermined length region (in this embodiment, the total axial length) on the upper end side, and a portion from this cylindrical portion 73. It has a vertical plate 74 protruding in the lateral direction and is integrally formed. The cylindrical portion 73 has an inner diameter substantially the same as or slightly larger than the outer diameter of the cylindrical portion 67 of the tread support member 61, and is capable of fitting the cylindrical portion 67 therein. It is connected to the tread support member 61 on the upper stage side by screwing 66 and the female screw 72 of the cylindrical portion 73. The vertical plate 74 has bolt insertion elongated holes 75 formed in two steps, one above the other, and the bolt 76 (FIG. 9) is projected while the vertical plate 74 is inserted into the gap of the projecting piece 68 of the tread support member 61. By passing through the bolt insertion hole 70 of the piece 68 and the bolt insertion long hole 75 of the vertical plate 74 and screwing on a nut (not shown) on the opposite side, it is connected to the tread support member 61 on the lower side (FIG. 15). ).

The connecting member 62 includes a tread support member that supports the lower tread (for example, a tread support member 61b that supports the tread 51b) and a tread support member that supports the upper tread (for example, a tread support member 61c that supports the tread 51c). And are connected to each other by adjusting the intervals in the vertical direction and the front-back direction. That is, as described above, the male screw 66 of the cylindrical portion 67 and the female screw 72 of the cylindrical portion 73 in the state where the cylindrical portion 67 of the upper step side tread support member 61c is fitted into the cylindrical portion 73 of the connecting member 62. It is possible to adjust the vertical distance through screwing with, and one of the holes through which the bolt 76 is inserted (the bolt insertion hole 70 of the projecting piece 68 in this embodiment) is substantially matched with the shaft diameter of the bolt 76. It is possible to adjust the distance in the front-rear direction by forming a round hole having an inner diameter that is the same as the other hole (the bolt insertion long hole 75 of the vertical plate 74 in this embodiment) as a long hole that is long in the lateral direction.

The floor surface fixing member 63 is not particularly limited in configuration as long as it can fix the height of the tread supporting member 61a supporting the lowest step tread 51a to the floor surface 1 of the lower floor. In this embodiment, it has a female screw 78 that is formed as a disc-shaped floor fixing plate 77 that is fixed to the floor and that is screwed with the male screw 66 of the cylindrical portion 67 of the tread support member 61a. Then, after the floor surface fixing plate 77 is fixed to the floor surface 1 of the lower floor by driving a screw (not shown) into the floor surface 1 of the lower floor from the screw hole 80 of the floor surface fixing plate 77, the male part of the cylindrical portion 67 is By screwing the screw 66 into the female screw 78 of the floor surface fixing member 63, the lowermost step tread support member 61a (and hence the tread 51a supported thereon) is moved to a predetermined height with respect to the floor 1 on the lower floor. It can be fixed with.

The wall surface fixing member 64 is not particularly limited in configuration as long as it can fix the tread support member 61c supporting the uppermost step plate 51c to the wall surface 2 so as to be adjustable in the front-rear direction, but in this embodiment, A wall surface fixing plate 81 fixed to the wall surface and a vertical plate 82 protruding from one surface thereof are integrally formed. The vertical plate 82 has substantially the same configuration as the vertical plate 74 of the connecting member 62, and has bolt insertion slots 83 formed in upper and lower two stages, and the vertical plate 82 is a gap between the projecting pieces 68 of the step plate supporting member 61c. The bolt 76 (FIG. 9) through the bolt insertion hole 70 of the projecting piece 68 and the bolt insertion long hole 83 of the vertical plate 82, and is screwed to a nut (not shown) on the opposite side. It is connected to the uppermost step support member 61c (FIG. 15). Then, after fixing the wall surface fixing plate 81 to the wall surface 2 by driving a screw (not shown) into the wall surface 2 from the screw hole 84 of the wall surface fixing plate 81, the wall surface fixing is performed in the gap of the projecting piece 68 of the uppermost step plate supporting member 61c. With the vertical plate 82 of the member 64 inserted, the bolt 76 (FIG. 9) is passed through the bolt insertion hole 70 of the projecting piece 68 and the bolt insertion long hole 83 of the vertical plate 82, and is attached to a nut (not shown) on the opposite side. The uppermost step plate supporting member 61c can be fixed to the wall surface 2 by screwing.

A method of constructing the stair structure 50 and the girder structure 60 described above will be described. After fixing the floor surface fixing member 63 to the floor surface 1 of the lower floor by driving a screw (not shown) into the floor surface 1 of the lower floor from the screw hole 80 of the floor surface fixing plate 77, By screwing the male screw 66 of the cylindrical portion 67 into the female screw 78 of the floor surface fixing member 63, the height of the lowermost step support member 61a is adjusted and fixed. Next, the cylindrical portion 67 of the middle-step tread support member 61b that supports the tread 51b is fitted into the cylindrical portion 73 of the connecting member 62a, and the heights of these are adjusted through the engagement of the male screw 66 and the female screw 72. And connect them. Then, the vertical plate 74 projecting from the cylindrical portion 73 is inserted into the gap of the projecting piece 68 of the lowermost step board supporting member 61a fixed to the floor surface 1 of the lower floor, and the bolt 76 is projected. Through the bolt insertion hole 70 of the vertical plate 74 and the bolt insertion long hole 75 of the vertical plate 74 and screwed to a nut (not shown) on the opposite side, so that the connecting member 62a is adjusted back and forth within the range of the bolt insertion long hole 75. Is connected to the lowermost step plate support member 61a. In this embodiment, since the vertical plate 74 of the connecting member 62 is sandwiched between a pair of pieces of the projecting piece 68 of each tread support member 61 and bolted, when the bolts are tightened, the gap between these pieces is closed. In addition to the screwing of the male screw 66 and the female screw 72, a tightly sandwiched state can be obtained between the vertical plate 74 and the projecting piece 68, and a fixing structure with high strength can be obtained.

Repeat this work for the number of steps on the stairs. Then, the uppermost step support member 61c is fixed to the wall surface 2 by the wall surface fixing member 64. As described above, this work is performed by driving a screw (not shown) into the wall surface 2 through the screw hole 84 of the wall surface fixing plate 81 to adjust the height between the floor surface 3 of the upper floor and the wall surface. After fixing the fixing member 64 to the wall surface 2, with the vertical plate 82 of the wall surface fixing member 64 inserted in the gap of the projecting piece 68 of the uppermost step board supporting member 61c, the bolt 76 (FIG. 9) is attached to the bolt of the projecting piece 68. This can be performed together with the front-rear adjustment by passing through the insertion hole 70 and the bolt insertion long hole 83 of the vertical plate 82 and screwing it into a nut (not shown) on the opposite side. After constructing the girder member 60 in this manner, the tread plate 51 is placed and fixed on each tread plate support member 61, and the stair structure 50 is obtained.

The staircase structure 50 and the girder structure 60 can be applied to the straight staircase and the turning staircase as in the first embodiment. Since the upper step side tread support member 61 and the connecting member 62 are connected by screwing the male screw 66 of the cylindrical portion 67 of the tread supporting member 61 and the female screw 72 of the cylindrical portion 73 of the connecting member 62, It is easy and possible to install the tread support members 61 adjacent to each other at an arbitrary rotation angle, and even when applied to a turning staircase as shown in FIG. 16, depending on the turning angle of the tread in the turning portion, It is possible and easy to install the tread support members 61 adjacent to each other at any rotation angle. In order to prevent the tread plate fixing plate 65 of the tread support member 61 supporting the tread 51 forming the turning part from exceeding the step nose (front end face) of the tread, when applied to the staircase like the first embodiment. The front end corner of the tread plate fixing plate 25 is chamfered.

In the first embodiment, the coupling member 22 and the upper step side tread support member 21 are coupled to each other by screwing screws (tail male screw 26 and female screw 32) with each other. It is considered to be one suitable connection mode because it is easy to adjust and a strong connection structure can be obtained, and it can be easily applied to the staircase. It is also possible to omit the female screw 32 and implement. Even in this case, as described above, the cylindrical portion 27 of the upper step side tread supporting member (for example, the tread supporting member 21b) is previously inserted into the cylindrical portion 33 of the connecting member 22a below it at a predetermined height. The vertical plate 28 protruding from the lower step tread support member 21a is inserted between the parallel protrusions 34 protruding from the connecting member 22a, and the bolt insertion hole 35 and the bolt insertion long hole are held. Since the slit 45 of the cylindrical portion 33 of the connecting member is closed by fixing with the bolt 36 passed through 30, the tight fitting state can be obtained between the cylindrical portions 27 and 33. The height can be maintained and the connection can be strong.

Although the present invention has been described in detail above with reference to some embodiments, the present invention is not limited to these embodiments, and various modifications are made within the scope of the invention defined in the claims. Or it can be changed and implemented. For example, in the first embodiment, the male screw 26 is formed in a predetermined height range reaching the lower end of the cylindrical portion 27 of the tread support member 21, and the female screw 32 is formed in the entire height range of the cylindrical portion 33 of the connecting member 22. However, the present invention is not limited to this. For example, a region where the male screw 26 is not formed is left near the lower end of the cylindrical portion 27 so that the region is formed smaller than the outer diameter of the threaded region, and a female screw is formed near the upper end of the cylindrical portion 33. The region may be formed larger than the inner diameter of the threaded region, leaving a region in which 32 is not formed. With this configuration, after the lower end of the cylindrical portion 27 of the tread support member 21 is inserted into the upper end of the cylindrical member 33 of the connecting member 22 and temporarily fixed, the screws can be screwed together and fixed in a state in which they are not displaced. Therefore, the work of connecting and fixing them while adjusting the height is facilitated, which is one preferable embodiment.

Further, the formation area of the male screw 26 in the cylindrical portion 27 of the tread support member 21 may be shorter than the formation area of the female screw 32 in the cylindrical portion 33 of the connecting member 22. In this way, if the height of the tread support member 21 is adjusted within the range in which the male screw 26 is hidden by the female screw 32 and the cylindrical portion 33, the male screw 26 is not exposed and looks good. Can be maintained well.

Further, the screw length of the male screw 26 and the female screw 32 is preferably in the range of 30 to 120 mm. If it is less than 30 mm, the joining strength between the tread supporting member 21 and the connecting member 22 will be insufficient and it will be difficult to support the stairs. If it exceeds 120 mm, the workability will be poor. From this viewpoint, a more preferable range is 50 to 100 mm.

The screw forming area and the screwing length described above are formed on the male screw 39 formed on the cylindrical portion 38 of the floor fixing member 23 and the cylindrical portion 27 of the lowermost step plate supporting member 21a in the first embodiment. The same can be applied to the female screw 31. In addition, regarding the male screw 66 formed on the cylindrical portion 67 of the tread supporting member 61 and the female screw 72 formed on the cylindrical portion 73 of the connecting member 62 in the second embodiment, the cylindrical portion 67 of the lowermost step supporting member 61a is also used. The same can be applied to the male screw 66 formed on the floor surface fixing member 63 and the female screw 78 formed on the floor surface fixing plate 77 of the floor surface fixing member 63.

Further, in the first and second embodiments, the male screws 26 and 66 are formed on the cylindrical portions 27 and 67 of the tread support members 21 and 61, and the female screws 32 and 72 are formed on the cylindrical portions 33 and 73 of the connecting members 22 and 62. Although they are formed and screwed together, conversely, female threads are formed on the cylindrical portions 27, 67 of the tread support members 21, 61, and male threads 32 are formed on the cylindrical portions 33, 73 of the connecting members 22, 62. Needless to say, an embodiment may be adopted in which the parts 72 and 72 are formed and these are screwed together.

1 Floor of the lower floor 2 Wall surface 3 Floor of the upper floor 10 Stair structure 11 (11a to 11c, 11a to 11h) Footboard 20 Girder structure 21 (21a to 21c, 21a to 21h) Footboard support member 22 (22a to 22c) Connecting member 23 Floor fixing member 24 Wall fixing member 25 Step plate fixing plate 26 Male screw 27 Cylindrical portion 28 Vertical plate (plate-shaped projecting piece)
29 screw hole 30 bolt insertion slot (fastening member insertion hole formed as a horizontal slot)
31 Female Screw 32 Female Screw 33 Cylindrical Part 34 Projecting Piece (Parallel Projecting Piece)
35 Bolt insertion hole (fastening member insertion hole formed as a round hole)
36 bolts (fastening members)
37 Floor fixing plate 38 Cylindrical part 39 Male screw 40 Screw hole 41 Wall surface fixing plate 42 Projecting piece 43 Bolt insertion hole 44 Screw hole 45 Slit 50 Stair structure 51 (51a to 51c) Step plate 60 Girder structure 61 (61a to 61c) Step plate Support member 62 (62a to 62c) Connecting member 63 Floor surface fixing member 64 Wall surface fixing member 65 Tread plate fixing plate 66 Male screw 67 Cylindrical portion 68 Projection piece (parallel projection piece)
69 screw hole 70 bolt insertion hole (fastening member insertion hole formed as a round hole)
72 Female screw 73 Cylindrical part 74 Vertical plate (plate-shaped projecting piece)
75 Bolt insertion slot (fastening member insertion hole formed as a horizontal slot)
76 bolts (fastening members)
77 Floor fixing plate 78 Male screw 80 Screw hole 81 Wall fixing plate 82 Vertical plate 83 Bolt insertion elongated hole 84 Screw hole 85 Slit

Claims (3)

A girder member constituting a stair girder structure, in which a tread support member having a tread support plate for supporting the tread at its upper end, an upper tread support member, and a lower tread support member can be height-adjusted and front and rear. And a connecting member that adjustably connects ,
One of the tread support member and the connecting member has a tubular portion, and the other member has a shaft portion that is slidably fitted in the tubular portion in the height direction, so that the connecting member and the tread supporting member are provided. And are connected for height adjustment,
The other member having the shaft portion is provided with a projecting piece projecting laterally and extending in the axial direction, and the one member having the cylindrical portion is sandwiched with a slit extending in the axial direction and the projections are provided on both sides thereof. A pair of parallel projecting pieces capable of sandwiching one piece is provided, and a fastening member insertion hole is formed in both the projecting piece and the parallel projecting piece, and one of them is formed as a round hole having an inner diameter substantially equal to the shaft diameter of the fastening member. And the other is formed as a laterally elongated hole having a width dimension larger than the shaft diameter of the fastening member, and the coupling member and the tread support member are coupled so as to be adjustable in the front-rear direction through the fastening member inserted through the round hole and the laterally elongated hole. A girder member characterized by being formed . Furthermore, it has a floor surface fixing member that fixes the tread supporting member that supports the lowermost tread to the floor surface of the lower floor, and a wall surface fixing member that fixes the tread supporting member that supports the uppermost tread to the wall surface. The girder member according to claim 1 , which is characterized in that: A girder structure configured using the girder member according to claim 1 .