JP5111274B2 - Exposed staircase and exposed staircase assembly method - Google Patents

Description

  The present invention relates to an exposed staircase that uses a tread board and a girder plate and does not have a kick board, and a method for assembling the exposed staircase.

In recent years, exposed stairs (open stairs) have been used as stairs installed indoors.
FIG. 16 is a perspective view showing a configuration of a conventional exposure step.
Conventional exposure staircases are fixed in a staircase pattern to two girders 91 and 91 that are diagonally spanned between the first and second floors of a building, for example. Are provided with a plurality of treads 92, 92,.

  Each of the girder plates 91 is formed with a number of tread plate support portions 911, 911,... Equal to the number of tread plates 92, 92,. Two rectangular cutout portions 921 and 921 adjacent to each other in the longitudinal direction are formed on the long side portion of each tread plate 92. Each tread board support portion 911 has a tread board mounting surface 91a on which the lower surface of the tread board 92 is placed and an outer method corresponding to the inner method of the notch 921, and is fitted to the notch 921. Part 91b.

An operator who installs an exposed staircase at a predetermined staircase installation place first installs the girders 91 and 91 separately in the left-right direction between the first floor and the second floor of the building.
Next, the operator applies an adhesive to the pair of left and right tread board support portions 911 and 911, and then the lower surface of the tread board 92 indicated by a two-dot chain line in the drawing is placed on the tread board placement surface 91a, and the notch 921 is formed. Is fitted into the girder plates 91 and 91 in the direction of the white arrow in the figure so as to be fitted into the fitting portion 91b.

Further, there has been proposed an exposed staircase in which a plurality of tread boards are fixed in a staircase pattern to one or two girder boards using a tread board fixing tool separate from the girder board and the tread board (Patent Literature). 1-5).
Further, there has been proposed an exposed staircase in which a tread is placed on a receiving portion that is provided integrally with a further girder (see Patent Document 6).

The exposed staircase as described above is more decorative and more open than the box staircase (that is, a staircase with one or both sides attached to the wall and provided with a kick board). Therefore, it is often installed in a space where decoration and a feeling of openness are preferred, such as a living room.
JP 2006-322304 A JP 2006-177053 A JP 2006-97384 A JP 2006-97383 A JP 2005-315031 A JP-A-2005-30082

However, in the case of the conventional exposed staircase as shown in FIG. 16, the notch portions 921 and 921 are recessed from the long side portion of the tread plate 92 to the central portion in the short side direction. There is a problem that the strength is lower than the tread of the board.
In addition, the tread plate support portion 911 corresponding to one notch portion 921 must be formed by processing the end surface and both sides of the long side portion of the girder plate 91, which increases man-hours and increases production efficiency. There is a problem of being bad.

In general, the girders 91 and the treads 92 are each carried into the staircase installation place of the exposed staircase with the treadboard support portions 911 and the notches 921 formed in the factory. That is, the distance between the notches 921, 921 is constant. However, the distance between the pair of left and right treadboard support portions 911 and 911 of the girders 91 and 91 may not be constant due to warpage of the girders 91 and distortion of the staircase installation location. In this case, there arises a problem that the tread plate 92 cannot be fitted into the girders 91 and 91.
Further, since the girder plate 91 interferes with the tread plate 92 at the portion where the tread plate support portion 911 and the cutout portion 921 are fitted, the illusion that the area of the upper surface of the tread plate 92 is smaller than the actual is struck. There is a problem that the user receives an impression that the size is narrow.

  If it is an exposure staircase of patent documents 1-6, a conventional exposure staircase as shown in Drawing 16 (namely, step board 92 which has notch parts 921 and 921 will be replaced with girder board 91 which has tread board support parts 911 and 911. , 91, and the configuration is different from the exposed staircase), and the above-described problem does not occur.

  However, the exposed staircase described in Patent Document 2 requires a treadle fixture (fixed plate) having a complicated shape. Further, the exposed staircase described in Patent Document 3 requires two types of tread board fixing tools (tread board holders and tread board clamps). Further, the exposed staircase described in Patent Document 4 is added to the tread board and transmitted to the tread board fixing tool because the tread board fixing tool (tread board receiving tool) is fixed to the girder board (girder) only with screws. It is necessary to support the load with screws only. That is, there is anxiety about the strength against the load. Furthermore, although the exposed staircase described in Patent Document 5 uses a simple T-shaped tread board fixing tool (tread board receiving material), the structure of the girder plate (side girder) to which the tread board fixing tool is to be attached is provided. It is complicated. In the exposed staircase described in Patent Document 6, the shape of the girder plate (sagger girder) is complicated because the tread plate fixing tool is not used.

  The exposed staircase described in Patent Document 1 is formed by using one type and a simple angle-shaped tread board fixture (mounting bracket). The girder plate (girder) is formed with a recessed portion having a simple shape such as a trapezoidal shape, a parallelogram shape, or a triangular shape having a depth equal to the plate thickness of one side surface portion of the tread plate fixture. Since the treadle fixture is screwed with most of one side part fitted in the recess of the girder, the load applied to the treadle and transmitted to the treadle fixture is not limited to the screw. It can also be supported by the inner and lower surfaces of the recess. For example, compared to the exposed staircase described in Patent Document 4, the strength against the load is improved.

However, since the concave portion of the girder plate needs an opening area that can fit most of one side surface portion of the tread plate fixing tool, it takes time and effort to process the girder plate. For this reason, it is desirable to further reduce processing time.
Further, the inner and lower surfaces of the concave portions of the girder plate have a depth equal to the plate thickness of the tread plate fixture, and therefore the area is small. For this reason, it is desirable to devise so that the load applied to the tread board and transmitted to the tread board fixing tool can be supported over a wide area to further improve the strength against the load.

  The present invention has been made in view of such circumstances, and its main object is to protrude outward from the angle longer than the plate thickness of the footboard fixture at the tip of one side surface portion of the angled footboard fixture. With the protrusions provided integrally and the protrusions fitted in the fitting grooves formed on the girder plate, one side of the tread plate fixing tool is screwed to the girder plate, and the other side surface is used as the tread plate. By adopting a screw-fastening configuration, it is possible to fix the tread plate to the girder plate in which a simple-shaped fitting groove is formed using a single type and simple shape tread plate fixing tool. An object of the present invention is to provide an exposed staircase capable of supporting a load applied to a tread with a large area on the inner and lower surfaces of a groove.

  Another object of the present invention is to insert the protruding portion of the tread plate fixture whose other side surface portion is screwed to the tread plate into the lowermost fitting groove from the opening portion of the upper side end surface of the girder plate. It is an object to provide an exposed staircase and a method for assembling the exposed staircase that can fix the bottom stepboard to the girder plate easily by screwing one side surface portion of the treadboard fixture to the girder plate. .

  Another object of the present invention is to fasten the treadle other than the lowest step by screwing the treadle fixing tool to the girder before screwing the treadle to the treadle fixing tool. An object of the present invention is to provide a method for assembling an exposed staircase that can obscure fitting grooves other than the lowest fitting groove.

  Still another object of the present invention is to fix the treadle other than the lowest step easily by screwing the treadle fixture to the treadle first and then screwing the treadle fixture to the girder. Another object of the present invention is to provide a method for assembling an exposed staircase that can unify the shapes of the lowermost fitting groove and the lowermost fitting groove.

  The exposed staircase according to the first aspect of the present invention has one or two exposed staircases in which a longitudinal direction is inclined and one surface is erected in a vertical posture between the upper and lower steps of a building having an upper step and a lower step. A girder plate, a plurality of tread plates fixed to the girder in a stepwise manner in a lateral posture, and each tread plate is fixed to the girder plate, and one side portion is screwed to the one surface In the exposed staircase provided with an angled tread board fixing tool whose other side surface part is screwed to the lower surface of the tread board, the protruding part that protrudes outside the angle longer than the plate thickness of the tread board fixing tool is A fitting groove that is integrally provided at the tip of the side surface, has a depth and a width corresponding to the projection amount and plate thickness of the projection, and is fitted with the projection. It is characterized by being formed.

  In the exposed staircase according to the second aspect of the invention, the lowermost fitting groove into which the protruding portion of the tread plate fixing tool for fixing the lowermost step plate to the girder plate is fitted is also provided on the upper side end surface of the girder plate. It is characterized by opening.

  The method for assembling an exposed staircase according to the third aspect of the present invention is a method in which a longitudinal direction is inclined and one surface is erected in a vertical posture between the upper step and the lower step of a building having an upper step and a lower step. Two girder plates, a plurality of treads fixed to the girder in a stepwise manner in a lateral posture, and each tread plate is fixed to the girder plate, and one side portion is screwed to the one surface In the method of assembling an exposed staircase having an angled tread board fixing tool whose other side surface is screwed to the lower surface of the tread board, the tread board fixing tool is longer than the plate thickness of the tread board fixing tool. A tread plate fixing device in which a projecting portion projecting to the outside of the angle is integrally provided at the tip portion of one side surface portion is prepared, and the depth corresponding to the projecting amount and thickness of the projecting portion as the girder plate And a fitting groove into which the protruding portion is fitted is formed on the one surface. The lowermost fitting groove into which the protruding portion of the tread plate fixing tool for fixing the tread plate to be the lowest step is fixed to the upper side when the girder plate is installed. A girder plate having an opening at an end surface is prepared, and the girder plate is inclined between the upper stage and the lower stage in a longitudinal direction, the one surface is in a vertical posture, and the side end surface is an upper side. And the other side surface portion of the tread plate fixing tool is screwed to the lower surface when the tread plate to be the lowest step is fixed to the girder plate, and the protruding portion of the tread plate fixing device Is inserted into the lowermost fitting groove from the opening portion of the side end surface, and one side surface portion of the tread plate fixing tool is screwed to the one surface.

  In the assembling method of the exposed staircase according to the fourth aspect of the present invention, after the girder plate is erected, the projecting portion of the tread plate fixing tool other than the tread plate fixing tool for fixing the tread plate to be the lowest step to the girder plate is provided at the lowermost position. The one side part of the tread board fixing tool is screwed to the one surface, and the other side part of the tread board fixing tool is a tread other than the tread that should be the lowest step. It is characterized by being screwed to the lower surface of the.

  In the assembling method of the exposed staircase according to the fifth aspect of the invention, as the girder plate, a girder plate in which fitting grooves other than the lowermost fitting groove are also opened in the side end surface is prepared, and the girder plate is installed. After that, when the other side surface portion of the tread plate fixing tool other than the tread plate fixing tool for fixing the tread plate to be the lowest step to the girder plate is fixed to the girder plate of the tread plate other than the tread plate to be the lowest step, Screwed to the surface of the side plate, the projecting portion of the tread plate fixing tool is inserted into the fitting groove from the opening portion of the side end surface, and one side surface portion of the tread plate fixing tool is screwed to the one surface It is characterized by doing.

  In the first invention, the tread plate fixing tool for fixing the tread plate to the girder plate has an angle shape, and the protruding portion that protrudes outside the angle longer than the plate thickness of the tread plate fixing device is formed at the tip of the one side surface portion. It is provided integrally. In other words, for example, the tread plate fixing tool has a projecting surface portion projecting in the opposite direction in parallel to the other side surface portion at the front end portion of one side surface portion of the L-shaped angle member, and is deformed as a whole. It is shaped like a letter board. Such a footboard fixture has a simple shape. In the tread plate fixing tool, the protruding portion is fitted into a fitting groove formed on one surface of the girder plate, one side surface portion is screwed to this one surface (for example, a vertical surface), and the other side surface portion is the lower surface of the tread plate. Screwed to (in this case, a horizontal surface). That is, a plurality of types of tread board fixing tools such as a tread board fixing tool for receiving the tread board and a tread board fixing tool for holding the tread board are unnecessary.

Below, regarding the girder plate, one surface where one side surface portion of the tread plate fixing tool is screwed is referred to as a screw surface.
There are one or two girders, and the longitudinal direction is inclined at a predetermined angle between the upper and lower tiers of the building (for example, the second floor and the first floor), and the screw surface is installed in a vertical posture. A tread board fixing tool is screwed to the screw surface. When there are two girder plates, the two girder plates are spaced apart from each other in parallel so that, for example, the screw surfaces are the inner surfaces facing each other or the outer surfaces. On the other hand, when there is one girder, both sides of one girder are used as screw surfaces.

  A fitting groove is formed on the screw surface of the girder plate. Each fitting groove has a depth and a width corresponding to the protrusion amount and plate thickness of the protrusion. That is, the fitting groove has a simple straight line shape, and has a necessary and sufficient dimension for fitting with the plate-like protrusion. Since such a fitting groove can be easily formed in a short time, the processing time is reduced. Furthermore, since it is not necessary to form a concave portion or a convex portion other than the fitting groove in order to attach the tread plate fixing tool to the girder plate, the configuration of the girder plate is simple and the shape is simple. When the girder plate is produced at a factory, for example, the fitting groove is formed with high accuracy. Therefore, the tread plate fixing tool can be easily positioned accurately by fitting the protrusion into the fitting groove.

  The plurality of treads are generally arranged in a staircase shape and fixed to the girder in a horizontal posture using two treadle fixtures per sheet. One side part of each tread plate fixing tool is screwed to the screw surface of the girder plate, and the protrusion provided integrally with the one side surface part is in the fitting groove formed on the screw surface of the girder plate. It is fitted from the proximal end to the distal end. Therefore, the load applied to the tread board and transmitted to the tread board fixture is supported by the screw and the inner and lower surfaces of the fitting groove. Since the protruding portion protrudes longer than the plate thickness of the tread plate fixture, and the fitting groove has a depth corresponding to the protruding amount of the protruding portion, the inner and lower surfaces of the fitting groove have a large area. Therefore, the load can be stably supported.

Since the exposed staircase as described above uses a tread board fixing tool to fix the tread board to the girder board, it is not necessary to form a notch in the tread board for fitting and fixing the tread board to the girder board. Therefore, the strength of the tread is not weakened.
In addition, it is not necessary to machine both sides of the girder plate for one tread plate fixing tool to be screwed, and it is only necessary to form one fitting groove on the screw surface of the girder plate. Good.

Each of the girder plate, the tread plate, and the tread plate fixing tool is produced, for example, at a factory, and is carried into a staircase installation place. Since the screw fixing of the tread plate fixing tool to the tread plate is performed not at the factory but at the stair installation location, when fixing the tread plate to the two girder plates, the separation distance between the two girder plates installed at the stair installation location In response, the two tread board fixtures are spaced apart and screwed to the tread board. Therefore, even if the distance between the girder plates is different at each position in the vertical direction, the tread plate can be fixed to the girder plate without any problem.
The tread board fixing tool is arranged on the lower side of the tread board. Moreover, since the tread board is not fitted and fixed to the girder board, there is no interference between the tread board and the girder board. As a result, the user has the impression that the area of the upper surface of the tread board observed by the user and the actual area sensuously coincide with each other and the scaffold is wide.

In the second invention and the third invention, each of the fitting grooves formed on the screw surface of the girder is open to this screw surface, but at least the lowermost step among these fitting grooves. The fitting groove (that is, the lowermost fitting groove) into which the protruding portion of the tread plate fixing tool (hereinafter referred to as the bottom tread plate fixing tool) for fixing the tread plate to the girder plate is fitted only on the screw surface of the girder plate. In addition, the upper side end surface is also opened in the side end surface of the beam plate (that is, the end surface along the longitudinal direction of the beam plate).
An operator who installs the exposure stairs prepares one or two girder plates, a plurality of treads, and generally two treadle fixtures per tread.
Here, the girders to be prepared by the operator are girders in which fitting grooves are formed on the screw surfaces. However, at least the lowermost fitting groove is opened not only on the screw surface of the beam plate, but also on the side end surface that becomes the upper side when the beam plate is installed. This side end face is hereinafter referred to as an opening end face.

An operator constructs the girder between the upper stage and the lower stage of the building so that the longitudinal direction is inclined at a predetermined angle and the screw surface is in a vertical posture. At this time, an operator arrange | positions a beam board so that an opening side end surface may become an upper side. When there are two girder plates, the operator installs the two girder plates in the same manner by separating them in parallel by an appropriate length.
Before or after fixing the treads other than the treads to be the lowest level (hereinafter referred to as treads other than the bottom level) to the girder, the operator firstly relates to the treads to be the lowest level. Screw the other side of the bottom footboard fixture to the side that will be the bottom when it is fixed to the bottom. As a result, the bottom tread and the bottom tread fixing tool (more specifically, the plurality of bottom tread fixing tools) are integrated.

Next, the operator inserts the protruding portion of the bottom tread plate fixing tool integrated with the tread plate to be the bottom step into the bottom fitting groove formed on the screw surface of the girder plate. It inserts from the opening part of an opening side end surface. The projecting direction of the protruding portion is the longitudinal direction of the lowermost fitting groove, that is, the direction in which the footboard is arranged (that is, the lateral direction), so that it is integrated with the lowermost footboard fixing tool or the lowermost footboard fixing tool. The tread is not in contact with the treads other than the lowest step already fixed to the girder.
Finally, the operator screws one side portion of the lowermost tread plate fixing tool on the screw surface of the beam plate.

  If the projecting part of the lowermost footboard fixture is inserted into the lowermost fitting groove before screwing the lowermost footboard fixture to the girder plate, one side of the lowermost footboard fixture will be After being screwed to the girder plate, the other side surface portion of the lowermost tread plate fixing tool integrated with the girder plate is screwed to the lower surface of the tread plate. However, the separation distance between the lower surface of the bottom tread and the floor of the lower floor of the building is stipulated by law. There is only insufficient space to arrange the tools in the vertical direction. For this reason, it is difficult to fix the screws in the vertical direction (that is, screws on the other side surface of the lowermost tread plate fixing tool with respect to the lower surface of the tread plate).

In the fourth invention, after the girder plate is installed, a tread plate other than the tread plate to be the lowest step (that is, a tread plate other than the lowest step) is fixed to the girder plate. However, the tread plate fixing tool is screwed to the tread plate after being screwed to the girder plate.
The operator can insert the protruding portion of the tread plate fixture other than the bottom tread fixture (hereinafter referred to as a non-bottom tread fixture) into the fitting groove other than the bottom fitting groove (hereinafter referred to as the bottom tread fixture). (It is called a fitting groove). Next, the operator screws one side surface portion of the tread plate fixing tool other than the lowest to the screw surface of the beam plate. Finally, the operator screws the other side surface portion of the tread plate fixing tool other than the lowest to the lower surface of the tread plate other than the lowermost step.

Since the insertion direction of the protruding portion with respect to the fitting groove is the horizontal direction, the treads other than the lowermost step are fixed in order from the uppermost side to the lower step, even if they are fixed in order from the lowermost step side to the upper step side. However, it does not come into contact with other treads that are already fixed to the girders. That is, the degree of freedom of work is improved.
The fitting grooves other than the bottom may or may not open on the opening side end face.
The protruding part of the tread plate fixture other than the bottom is inserted into the fitting groove other than the lowermost from the opening part of the screw surface, but the fitting groove other than the lowest is also open on the opening side end face May be inserted from the opening portion of the opening side end face. That is, the degree of freedom of work is further improved.

In the fifth invention, after the girders are erected, the treads other than the lowest step are fixed to the girders. However, the tread plate fixing tool is screwed to the girder plate after being screwed to the tread plate.
Here, the girders to be prepared by the operator are girders in which fitting grooves are formed on the screw surfaces. However, each fitting groove is opened not only on the screw surface of the beam plate but also on the opening side end surface.
First, regarding the step board other than the lowermost step, the operator screws the other side surface portion of the step board fixing tool other than the lowermost to the lower surface when the step plate is fixed to the girder plate. As a result, the treads other than the lowermost step and the treadle fixtures other than the lowermost (more specifically, a plurality of treadle fixtures other than the lowermost) are integrated.

  Next, the operator inserts the protruding portion of the tread plate fixing tool other than the bottom integrated into the tread plate other than the lowermost step into the fitting groove other than the lowermost formed on the screw surface of the girder plate. It inserts from the opening part of the opening side end surface. The projecting direction of the protruding portion is the longitudinal direction of the fitting groove other than the bottom, that is, the direction in which the tread is disposed (that is, the lateral direction), and thus is integrated with the tread fixing device other than the bottom or the tread fixing device other than the bottom. The tread that has been made does not come into contact with other treads that have already been fixed to the girder. In addition, if the treads other than the bottom are fixed in order from the bottom to the top, or conversely, they are fixed in order from the top to the bottom, other treads that are already fixed to the girder There is no contact. That is, the degree of freedom of work is improved.

  Similar to the lowermost fitting groove, the fitting grooves other than the lowest are opened on the opening side end face. That is, the shape of each fitting groove formed in the beam plate is unified.

In the case of the exposed staircase according to the first aspect of the present invention, the tread plate can be fixed to the girder plate in which the fitting groove having a simple shape is formed by using a tread plate fixing tool of one type and a simple shape. Therefore, compared with the conventional exposure stair described in, for example, Patent Document 1, the processing time can be further reduced.
In addition, not only the screw but also the inner and lower surfaces of the fitting groove having a large area can support the load applied to the tread. For this reason, compared with the exposure staircase described in Patent Document 1, for example, the strength against the load is improved.

  Moreover, since each shape is simple, a girder board, a tread board, and a tread board fixing tool can be efficiently produced, for example in a factory. Furthermore, since it is not necessary or easy to process the girder plate, the tread board, and the tread board fixing tool at the installation site, the time required for the installation work can be shortened, and the installation cost can be kept low. . Furthermore, the tread board can be placed at the correct position at the factory, or the tread board can be placed at the installation site by arranging two tread board fixtures according to the distance between the two girder boards. Can be fixed with high accuracy.

  In the method of assembling the exposed staircase of the second invention and the exposed staircase of the third invention, the bottom tread can be attached to the girder plate, even if the tread plate other than the bottom step is fixed to the girder plate first or later. Can be easily fixed to the spar. In addition, workability is high because there is no need to screw in the vertical direction in a narrow space between the tread board and the floor surface.

  According to the exposed staircase assembly method of the fourth aspect of the invention, it is possible to easily fix the treads other than the lowermost step without restricting whether the upper stepping plate is fixed first to the beam plate or the lower stepping step first. can do. Further, the aesthetic appearance can be improved by making the fitting grooves other than the lowest fitting groove inconspicuous.

  In the method of assembling the exposed staircase of the fifth aspect of the invention, it is possible to easily fix the treads other than the lowermost step without restricting whether the upper step plate is fixed first to the girder plate or the lower step side tread plate first. can do. In addition, the shape of each of the lowermost fitting groove and the lowermost fitting groove can be unified to improve the appearance.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

Embodiment 1.
1 and 2 are a perspective view and a front view showing a configuration of an exposed staircase according to Embodiment 1 of the present invention, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.
In the figure, 11 is an exposed staircase, and the exposed staircase 11 is installed, for example, indoors in a two-story building. By raising and lowering the exposed staircase 11, the user can move the floor F on the first floor and 2 Go back and forth between floors (not shown) on the floor.

  The exposed staircase 11 includes two left and right girder plates 21 and 22, N pieces (N is a natural number of 2 or more, for example, 14) tread boards 31, 31,..., And N tread board fixtures 41 arranged on the left side. , 41,... And N tread plate fixtures 42, 42,... Arranged on the right side, and these are arranged symmetrically.

The girder 21 is constructed between the first floor and the second floor. More specifically, the lower part of the girder 21 is placed on the horizontal floor F of the first floor, and the upper part of the girder 21 is fixed to the frame B that supports the floor of the second floor. Further, the longitudinal direction of the beam plate 21 is inclined at a predetermined angle θ with respect to the floor surface F, and the screw surface 211 which is one surface of the beam plate 21 is arranged vertically (vertically).
The girder plate 22 is constructed so that the girder plates 21 and 22 are symmetrical. At this time, the screw surface 211 of the beam plate 21 and the screw surface 221 of the beam plate 22 are arranged facing each other. In other words, the screw surfaces 211 and 221 are arranged inside the exposure stairs 11.
Each tread plate 31 is fixed to the girders 21 and 22 in a stepped manner in a horizontal posture (horizontal posture).

Each of the tread board fixtures 41 and 42 is formed in an angle, each tread board fixture 41 fixes the tread board 31 and the girder 21, and each tread board fixture 42 fixes the tread board 31 and the girder 22. .
One side surface portion 411 in the vertical direction of the tread board fixing tool 41 is screwed to the screw surface 211 of the girder plate 21 using three screws V, V, V, and the other side surface in the horizontal direction of the tread board fixing tool 41. The portion 412 is screwed to the back surface 312 which is the lower surface of the tread 31 using four screws V, V,. Similarly, one side surface portion 421 of the tread plate fixing tool 42 is screwed to the screw surface 221 of the girder plate 22 using three screws V, V, V, and the other side surface portion 422 of the tread plate fixing device 42 is The four screws V, V,... Are screwed to the lower surface of the tread plate 32.

FIG. 4 is a side view showing the configuration of the left girder 21 used for assembling the exposed staircase 11. Since the configuration of the right digit plate 22 corresponds to the configuration of the mirror image of the digit plate 21, the following description will mainly focus on the digit plate 21.
The girder 21 is a plate made of wood, wood, or the like, and has a shape like a trapezoidal shape by cutting both longitudinal ends of a rectangle having a large aspect ratio.
About both the short side parts 21a and 21b of the girder 21, the short side part 21a becomes the lower side when the girder plate 21 is installed at the stair installation place, and the short side part 21b becomes the upper side.

On the other hand, of the long side portions 21c and 21d of the girder 21, the longer long side portion 21c is on the upper side when the girder plate 21 is installed at the staircase installation location, and the shorter long side portion 21d is lower. Become side.
The virtual extension lines of the short side portions 21a and 21b intersect each other vertically, and the upper long side portion 21c intersects the lower short side portion 21a at a predetermined angle θ.

  One surface of the girder plate 21 is used as a screw surface 211 to which one side surface portion 411 of the tread plate fixture 41 is screwed. In the screw surface 211, N fitting grooves 212, 212,... Are formed in a step shape at positions corresponding to the fixed positions of the N pieces of treads 31, 31,. Each fitting groove 212 is open to the screw surface 211, and is also open to the side end surface of the upper long side portion 21c of the beam plate 21 (see FIGS. 2 and 4).

  Each fitting groove 212 has a depth substantially equal to a protruding amount of a protruding surface portion 413 (see FIGS. 2 and 6), which will be described later, of the tread plate fixture 41, and a width substantially equal to the plate thickness of the protruding surface portion 413. More specifically, the depth and width of the fitting groove 212 are about 1 mm longer than the protruding amount and the plate thickness of the protruding surface portion 413, respectively. Further, the length of the fitting groove 212 is equal to or longer than the length of the long side portion of the protruding surface portion 413. The fitting grooves 212, 212,... Have substantially the same shape and are parallel to the short side portion 21a.

The shape, formation position, and the like of the N fitting grooves 212, 212,... Can be formed with high accuracy using an NC router, for example, in a factory that produces plate materials. Further, the processing on the back surface of the screw surface 211 is not necessary, and each fitting groove 212 is in a straight line and has a small opening area. For example, the opening area such as a trapezoidal shape, a parallelogram shape, or a triangular shape is required. It can be easily formed in a shorter time than when a wide recess is formed.
The right girder plate 22 is also formed with N fitting grooves 222, 222,... As in the girder plate 21 (see FIG. 2).

FIG. 5A is a perspective view showing the configuration of the tread 31 used for assembling the exposed staircase 11.
The tread 31 is a rectangular plate made of wood, wood, or the like, and is provided with a non-slip 31a having appropriate unevenness on one long side of the surface 311 (see FIG. 1). On the other hand, the back surface 312 is planar. The front surface 311 (back surface 312) is a surface on the side that becomes the upper surface (lower surface) when the tread plate 31 is fixed to the girders 21 and 22.

FIG. 6 is a perspective view showing the configuration of the left and right tread board fixtures 41 and 42 used for assembling the exposed staircase 11 according to Embodiment 1 of the present invention. Since the configuration of the right footboard fixture 42 corresponds to the configuration of the mirror image of the left footboard fixture 41, the following will mainly describe the footboard fixture 41.
The tread board fixture 41 is a metal L-shaped angle member, and one side surface portion 411 and the other side surface portion 412 are arranged perpendicular to each other. Here, the plate thickness of the one side surface portion 411 and the plate thickness of the other side surface portion 412 are equal (for example, about 5 mm).

The other side surface portion 412 has a rectangular shape, and one long side portion of the rectangle corresponds to the base end portion of the other side surface portion 412. As shown in FIGS. 1 and 6, the other side surface portion 412 has one (total of four) screw holes formed at four rectangular corner portions.
On the other hand, the one side surface portion 411 has a trapezoidal shape. More specifically, as shown in FIGS. 3 and 6, the upper base portion of the longer side of the trapezoid corresponds to the base end portion of the one side surface portion 411 and is short. The lower bottom part of this is a right trapezoidal shape corresponding to the tip part. In addition, three screw holes are formed in the vicinity of the tip of the one side surface portion 411 along the right-angled portion of the right-angle trapezoid at a position corresponding to the vertex of a right triangle.

  Further, as shown in FIGS. 2 and 6, the tread plate fixture 41 is longer than the plate thickness of the tread plate fixture 41 and shorter than the length of the short side portion of the other side surface portion 412 (on the outer side of the angle). A rectangular projecting surface portion 413 projecting perpendicularly to the one side surface portion 411 is integrally provided at the distal end portion of the one side surface portion 411. In the protruding surface portion 413, one long side portion of the rectangle corresponds to the base end portion of the protruding surface portion 413. Moreover, the plate | board thickness of the protrusion surface part 413 is equal to the plate | board thickness of the one side part 411, and the protrusion amount from the one side part 411 of the protrusion surface part 413 is about 15 mm. For this reason, the depth of the fitting groove 212 is 16 mm, and the width is about 6 mm.

  That is, the other side surface portion 412 and the protruding surface portion 413 are provided in parallel to each other at the base end portion and the distal end portion of the one side surface portion 411 and protrude in opposite directions with the one side surface portion 411 interposed therebetween. Yes. As a result, the tread plate fixture 41 has a simple plate shape having a deformed Z-shaped cross section as a whole.

Such a tread board fixture 41 is formed, for example, by bending a metal plate or by using a mold.
Similarly to the footboard fixture 41, the right side footboard fixture 42 also has a protruding surface portion 423.
Note that a reinforcing plate portion that reinforces the tread plate fixture 41 by connecting the one side surface portion 411 and the other side surface portion 412 may be provided inside the angle of the tread plate fixture 41. In addition, the protruding amount of the protruding surface portion 413 from the one side surface portion 411 of the tread plate fixture 41 having a thickness of about 5 mm is not limited to about 15 mm, and the thickness and material of the girder plate 21 are, for example, in the range of about 15 mm to about 20 mm. It sets suitably according to etc.

7-9 is explanatory drawing of the assembly method of the exposure staircase 11. FIG.
The operator has 1 girder plate 21 and 22, N tread plates 31, N tread plate fixtures 41 and 42, and {14 × N} pieces for fixing the tread plate 31 to the girder plates 21 and 22. , And screws for fixing the girders 21 and 22 to the housing B are prepared. These are produced in advance at the factory and are carried into the staircase installation location.

  First, the worker performs the construction work of the girder plates 21 and 22 as shown in FIG. Next, after the installation of the girder plates 21 and 22, the operator integrates the tread plate 31 and the tread plate fixing devices 41 and 42 as shown in FIG. 8, and the tread plates for the girder plates 21 and 22 as shown in FIG. The fixing work of the fixtures 41 and 42 is repeated N times in order from the tread 31 that should be the lowest level to the tread 31 that should be the highest level.

  In more detail, the operator places the long side portion 21c on the upper side, the long side portion 21d on the lower side, and the end surface of the short side portion 21a on the floor surface F. Girder plate 21 is installed between housing B and floor surface F so that the end surface of portion 21b is in close contact with housing B and screw surface 211 is in a vertical posture (vertical posture) (FIGS. 3 and 7). reference). At this time, the longitudinal direction of the beam plate 21 is inclined with respect to the floor surface F at a predetermined angle θ.

In addition, the operator separates the screw surfaces 211 and 221 from each other by an appropriate length in a state where the screw surface 211 of the beam plate 21 and the screw surface 221 of the beam plate 22 face each other in parallel. It is installed in the same manner as the plate 21.
As a result of the above, the fitting grooves 212, 212,... This is because the fitting grooves 212, 212,... Are parallel to the short side portion 21a. Similarly, the fitting grooves 222, 222,... Of the beam plate 22 are also arranged in the lateral direction.

  After completing the construction work of the girder plates 21 and 22, the operator closes the outer surfaces of the other side surface portions 412 and 422 of the pair of left and right tread plate fixtures 41 and 42 to the back surface 312 of the tread plate 31, The four screws V, V,... Are passed through the four screw holes in each of the other side surface portions 412 and 422, and the tread plate fixtures 41 and 42 are screwed to the tread plate 31 (see FIGS. 1 and 8). As a result, the tread plate 31 and the tread plate fixtures 41 and 42 are integrated, and the tread plate 31 and the protruding surface portions 413 and 423 are parallel to each other.

However, the arrangement of the footboard fixtures 41 and 42 satisfies all the following conditions a) to d).
a) The tread board fixtures 41 and 42 are arranged in the vicinity of the long side portion of the tread board 31 where the slip stopper 31a is not formed.
b) The other side surface parts 412 and 422 are arranged close to each other (that is, the protruding surface parts 413 and 423 are arranged apart from each other).
c) The one side surface portions 411 and 421 and the short side portions of the tread plate 31 are parallel to each other.
d) The separation distance between the one side surface portions 411 and 421 is substantially equal to the distance between the screw surfaces 211 and 221 at the position where the tread plate 31 is to be fixed (ie, the inward distance).

  By the way, even if the distance between the screw surfaces 211 and 221 is slightly different depending on the vertical positions of the girders 21 and 22, the operator finely adjusts the arrangement of the tread plate fixtures 41 and 42 to thereby adjust the tread plate 31. Is fixed to the girders 21 and 22 without problems as described below.

Furthermore, the operator can use the projecting surface portion 413 of the tread plate fixtures 41 and 42 with respect to the tread plate 31 integrated with the tread plate fixtures 41 and 42 (that is, the tread plate 31 as indicated by a two-dot chain line in FIG. 9). , 423 are simultaneously inserted into the lowermost fitting grooves 212, 222 of the girders 21, 22 in the direction of the white arrow in FIG. 9 (see FIGS. 2 and 9). At this time, the operator inserts the protruding surface portion 413 into the fitting groove 212 from the opening portion of the side end surface (that is, the upper side end surface) of the long side portion 21c in the direction parallel to the screw surface 211, The protruding surface portion 423 is fitted into the fitting groove 222 from the opening portion of the upper side end surface in a direction parallel to the screw surface 221. At this time, the protruding surface portions 413 and 423 are fitted into the fitting grooves 212 and 222 as a whole from the proximal end portion to the distal end portion.
As a result, the one side surface portions 411 and 421 and the screw surfaces 211 and 221 are in close contact with each other.

Finally, the operator passes the three foot screws V, V, V through the three screw holes of the one side surface portion 411 in which the projecting surface portion 413 is fitted in the fitting groove 212, and the girder plate. Screw to 21. Similarly, the operator passes the three foot screws V, V, V through the three screw holes of the one side surface portion 421 in which the protruding surface portion 423 is fitted in the fitting groove 222, and puts the tread plate fixing tool 42 into the girder plate. Screw to 22. As a result, the tread plate 31 is fixed to the girders 21 and 22 in the horizontal posture.
Here, the screwing direction of the tread plate fixtures 41 and 42 with respect to the girder plates 21 and 22 is perpendicular to the girder plates 21 and 22, but in general, there is a screwing tool (for example, between the screw surfaces 211 and 221). Since there is a space large enough to arrange the electric driver), screwing is easy.

  After the work of fixing the lowermost tread 31 is completed, the operator performs the above-described work of integrating the tread 31 and the tread fixings 41 and 42 and the tread fixings 41 and 42 to the girders 21 and 22. Is performed on the tread 31 of the second stage from the lowermost stage, then is performed on the tread 31 of the third stage from the lowermost stage, and finally, is performed on the tread 31 of the uppermost stage. As a result, the tread plates 31, 31,... Are fixed to the girders 21, 22 in a stepped manner.

As shown in FIG. 9, the projecting surface portions 413, 423 are fitted into the fitting grooves 212, 222 laterally from the near side to the far side of the girders 21, 22, so that they are integrated with the tread plate fixtures 41, 42. The tread 31 that has been made abuts against the treads 31, 31,... Already fixed to the girders 21, 22, and the fixing operation of the tread 31 is not hindered.
In the present embodiment, the procedure for fixing the treads 31, 31,... In order from the bottom to the top is illustrated, but the present invention is not limited to this. For example, a procedure of fixing in order from the top to the bottom may be used.

The exposed staircase 11 as described above can be installed inexpensively in a short time because the assembly method is simple.
Moreover, like a conventional exposure staircase, it has higher decorativeness and a sense of openness than a box staircase. Further, unlike a conventional fitting type exposed staircase in which a tread plate having a notch is fitted and fixed to a girder plate having a tread plate support portion, each tread plate 31 is attached to the girder plate using a pair of left and right tread plate fixing tools 41 and 42. Since it is fixed to 21 and 22, various problems that occur with respect to the fitting type exposed staircase (the strength of the tread board is weakened by the notch, the number of man-hours for processing the girder plate, etc.) do not occur.

  Furthermore, in the fitting type exposed staircase, since it is necessary to form a tread board support portion on the girder, a girder having a thickness in the range of 60 mm to 75 mm, for example, is used. However, in the case of the exposed staircase 11, the girder plates 21 and 22 thinner than the fitting type exposed staircase girder may be used.

Furthermore, as shown in FIGS. 2 and 3, the load applied to the tread plate 31 and transmitted to the tread plate fixtures 41, 42 screws the side surface portions 411, 421 to the screw surfaces 211, 221. The screw is supported by the portion of the inner and lower surfaces of the fitting grooves 212 and 222 where the lower surfaces of the projecting surface portions 413 and 423 are in contact. Since this portion has a large area, the load can be stably supported.
In addition, since the formation positions of the fitting grooves 212 and 222 in the girder plates 21 and 22 are accurate, the projecting surface portions 413 and 423 are integrated into the fitting grooves 212 and 222 to be integrated with the tread plate fixtures 41 and 42. The tread 31 is also placed at an accurate position. That is, the protruding surface portions 413 and 423 and the fitting grooves 212 and 222 are also used for positioning the tread plate 31.

FIG. 5B is a perspective view showing a configuration of another step board used for assembling the exposed staircase 11. In the figure, reference numeral 32 denotes a tread, and the tread 32 has the same configuration as the tread 31, but rectangular concave positioning portions 32b and 32b are formed on the back surface 322, respectively.
The shape and size of the positioning portions 32b and 32b are substantially equal to the shape and size of the other side surface portions 412 and 422 of the tread board fixtures 41 and 42, and the other side surface portions 412 and 422 are fitted into the positioning portions 32b and 32b. The other side surface portions 412 and 422 are arranged so as to be accurately positioned.

Specifically, the positioning portions 32b and 32b are arranged in the vicinity of the long side portion where the anti-slip (not shown) of the tread plate 32 is not formed, and the long side portions of the positioning portions 32b and 32b and the tread plate 32. Both short side portions are parallel to each other, and the separation distance between the longest side portions of the positioning portions 32b and 32b that are most separated from each other is provided so as to be substantially equal to the distance between the screw surfaces 211 and 221.
The shape and the formation position of the positioning portions 32b, 32b,... Can be formed with high accuracy using an NC router in a factory that produces plate materials, for example.

  When the girder plates 21 and 22 are installed in a state where the screw surfaces 211 and 221 are arranged substantially in parallel with a certain distance, by using the tread plate 32 instead of the tread plate 31, The exposed staircase 11 can be easily assembled.

  By the way, in the case of the exposure staircase 11, the tread plate fixtures 41 and 42 are arranged inside the girders 21 and 22. For this reason, there is an advantage that the treadle fixtures 41 and 42 are not conspicuous and the aesthetic appearance is improved. Further, since the tread board fixing tools 41 and 42 support the vicinity of the center portion of the tread board 31 and the distance between the tread board fixing tools 41 and 42 is short, the bending of the tread board 31 when a load is applied to the tread board is small. There are also advantages. Furthermore, even if the wall surface of the building exists near the right side or the left side of the installation location of the exposed staircase 11, it is necessary to arrange a screwing tool between the wall surface and the screw surfaces 211 and 222. Therefore, there is also an advantage that there is no problem in the work of screwing the tread plate fixtures 41 and 42.

  In addition, you may arrange | position the girder plates 21 and 22 upside down. In this case, with the tread plate fixing tool 41 on the right side and the tread plate fixing device 42 on the left side, the screwing positions of the tread plate fixing tools 41 and 42 with respect to the tread plate 31 according to the separation distance of the screw surfaces 211 and 222. By separating them in the direction of the long side knitted portion, the exposed stairs can be assembled in the same procedure as described above. In this case, since it is not necessary to arrange a screwing tool between the girders 21 and 22, the work of screwing the tread plate fixtures 41 and 42 is simple.

Embodiment 2. FIG.
10 and 11 are a perspective view and a front view showing a configuration of an exposed staircase according to Embodiment 2 of the present invention, and FIG. 12 is a cross-sectional view taken along line XII-XII in FIG.
In the figure, reference numeral 12 denotes an exposed staircase, and the exposed staircase 12 is installed, for example, indoors in a two-story building like the exposed staircase 11 of the first embodiment.

The exposure staircase 12 includes two left and right girders 23, 24, N treads 31, 31,..., N tread fixings 42, 42,. The treadle fixtures 41, 41,... Are provided symmetrically.
The dimensions, shapes, and the like of each tread 31, each tread fixing tool 41, and each tread fixing tool 42 are the same as the dimensions, shapes, and the like of each tread 31, each tread fixing tool 41, and each tread fixing tool 42 of the first embodiment. equal.
The girder plates 23 and 24 have the same dimensions and outer shape as the girder plates 21 and 22 of the first embodiment, and are installed between the first floor and the second floor, like the girder plates 21 and 22. .
However, the screw surfaces 231 and 241 are arranged outside the exposed staircase 12.

Each of the tread board fixtures 41 and 42 has an angle shape, each tread board fixture 42 fixes the tread board 31 and the girder plate 23, and each tread board fixture 41 fixes the tread board 31 and the girder plate 24. .
One side surface portion 411 of the tread plate fixing tool 41 is screwed to the screw surface 241 of the girder plate 24 using three screws V, V, V, and the other side surface portion 412 of the tread plate fixing device 41 includes four pieces. Are screwed to the lower surface of the tread 32 using screws V, V,. Similarly, one side surface portion 421 in the vertical direction of the tread plate fixing tool 42 is screwed to the screw surface 231 of the girder plate 23 using three screws V, V, and V. The other side surface portion 422 is screwed to the back surface 312 which is the lower surface of the tread 31 using four screws V, V,.

FIG. 13 is a side view showing the configuration of the right side digit plate 24 used for assembling the exposure staircase 12. The configuration of the left spar 23 corresponds to the configuration of the mirror image of the spar 24, and therefore the spar 24 will be mainly described below.
The girder plate 24 has the same outer shape as the girder plate 21 of the first embodiment.
About both the short side parts 24a and 24b of the girder plate 24, when the girder plate 24 is installed in a staircase installation place, the short side part 24a is on the lower side, and the short side part 24b is on the upper side. On the other hand, with respect to the long side portions 24c and 24d of the girder plate 24, the longer long side portion 24c is on the upper side when the girder plate 24 is installed at the staircase installation location, and the shorter long side portion 24d is on the upper side. become.

  One surface of the girder plate 24 is used as a screw surface 241 to which one side surface portion 411 of the tread plate fixture 41 is screwed. A single fitting groove 242 is formed in the screw surface 241 at a position corresponding to the fixing position of the lowermost tread 31. The fitting groove 242 has the same shape and the same size as the fitting groove 212 of the first embodiment. Further, {N-1} fitting grooves 243, 243,... Are fitted at positions corresponding to the fixed positions of {N-1} treads 31, 31,. It is formed in a stepped shape including the groove 242 and in parallel with the short side portion 24a. Each fitting groove 242 opens in the screw surface 241, but unlike the fitting groove 242, the fitting groove 242 does not open in the side end surface of the upper long side portion 24c of the beam plate 24 (see FIG. 11).

  Each fitting groove 243 has a depth substantially equal to the protruding amount of the protruding surface portion 413 of the tread plate fixture 41, a width substantially equal to the plate thickness of the protruding surface portion 413, and a length substantially equal to the length of the long side portion of the protruding surface portion 413. Have. More specifically, the depth, width, and length of the fitting groove 243 are about 1 mm longer than the protruding amount, the plate thickness, and the length of the long side portion of the protruding surface portion 413, respectively. That is, the fitting grooves 243, 243,... Have substantially the same shape but are different from the fitting groove 242.

The shape and formation position of the N fitting grooves 242, 243, 243,... Can be formed with high accuracy using an NC router, for example, in a factory that produces plate materials. Further, there is no need to process the back surface of the screw surface 241, and the fitting grooves 242, 243, 243,... Are straight and have a small opening area, so that, for example, a trapezoidal shape, a parallelogram shape, or a triangular shape is used. It can be easily formed in a shorter time than when forming a recess having a wide opening area such as a shape.
Similarly to the girder plate 22, the left girder plate 23 is also formed with one fitting groove 232 and {N-1} fitting grooves (not shown) (see FIG. 11).
Other parts corresponding to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 14 is an explanatory diagram of an assembling method of the exposed staircase 12.
The operator has one girder plate 23, 24, N tread plates 31, N tread plate fixtures 41, 42, and {14 × N} pieces for fixing the tread plate 31 to the girder plates 23, 24. , And screws for fixing the girders 23 and 24 to the housing B are prepared. These are produced in advance at the factory and are carried into the staircase installation location.

First, the operator executes the construction work of the girder plates 23 and 24 in the same manner as the construction work of the girder plates 21 and 22 as shown in FIG. 7, and after the construction of the girder plates 23 and 24, as shown in FIG. The work similar to the integration work of the tread board 31 and the tread board fixing tools 41 and 42 and the work similar to the work of fixing the tread board 31 to the girders 21 and 22 as shown in FIG. Run on the tread 31.
After that, the operator repeatedly executes the fixing of the tread plate fixing tool 41 to the girder plate 24 as shown in FIG. 14 {N-1} times, and fixes the tread plate fixing device 42 to the girder plate 23 by {N-1}. -1} repeatedly. Finally, the operator attaches the screws of the tread 31 to the tread fixing fixtures 41 and 42 {N-1} times from the bottom to the tread 31 that should be the top, in order from the tread 31 that should be the second. Run repeatedly.

  More specifically, the operator places the long side portion 24c on the upper side, the long side portion 24d on the lower side, and the end surface of the short side portion 24a on the floor surface F. The end plate of the portion 24b is brought into close contact with the casing B, and the girder plate 24 is installed between the casing B and the floor F so that the screw surface 241 is in a vertical position (see FIGS. 7 and 12). At this time, the longitudinal direction of the beam plate 24 is inclined with respect to the floor surface F at a predetermined angle θ.

In addition, the operator places the screw surfaces 231 and 241 in a state where the screw surfaces 231 of the beam plate 23 and the screw surfaces 241 of the beam plate 24 are parallel to each other and the back surfaces of the screw surfaces 231 and 241 face each other. The girder plate 23 is erected in the same manner as the girder plate 24 with an appropriate distance therebetween.
As a result, the fitting grooves 242, 243, 243,... This is because the fitting grooves 242, 243, 243,... Are parallel to the short side 24a. Similarly, the fitting groove 232 of the girder 23 and the fitting groove (not shown) are also arranged in the lateral direction.

  After the installation of the girder plates 23 and 24 is completed, the operator brings the outer surfaces of the other side surface portions 412 and 422 of the pair of left and right tread plate fixtures 41 and 42 into close contact with the back surface 312 of the tread plate 31, and The screws V, V,... Are passed through the four screw holes on each of the other side surface portions 412 and 422, and the tread plate fixtures 41 and 42 are screwed to the tread plate 31 (see FIGS. 8 and 10). As a result, the tread plate 31 and the tread plate fixtures 41 and 42 are integrated, and the tread plate 31 and the protruding surface portions 413 and 423 are parallel to each other.

However, the arrangement of the footboard fixtures 41 and 42 satisfies all the following conditions d) to g).
d) The tread board fixtures 41 and 42 are arranged in the vicinity of the long side portion of the tread board 31 where the slip stopper 31a is not formed.
e) The other side surface parts 412 and 422 are spaced apart from each other (that is, the projecting surface parts 413 and 423 are close to each other).
f) The one side surface portions 411 and 421 and the short side portions of the tread plate 31 are parallel to each other.
g) The distance between the side surface portions 411 and 421 is substantially equal to the distance between the screw surfaces 231 and 241 at the position where the tread plate 31 should be fixed.

  By the way, even if the distance between the screw surfaces 231 and 241 is slightly different depending on the vertical positions of the girders 23 and 24, the operator finely adjusts the arrangement of the tread plate fixtures 41 and 42 to thereby adjust the tread plate 31. Is fixed to the girders 23 and 24 without any problem.

Further, the operator simultaneously fits the projecting surface portions 413 and 423 of the tread plate fixing tools 41 and 42 at the bottom of the girder plates 24 and 23 with respect to the tread plate 31 integrated with the tread plate fixing tools 41 and 42. It fits into the grooves 242 and 232 (see FIGS. 9 and 11). At this time, the operator inserts the protruding surface portion 413 into the fitting groove 242 from the opening portion of the side end surface (that is, the upper side end surface) of the long side portion 24c, and similarly, the protruding surface portion 423 is inserted into the upper side end surface. Is inserted into the fitting groove 232 from the opening. At this time, the protruding surface portions 413 and 423 are fitted into the fitting grooves 242 and 232 as a whole from the proximal end portion to the distal end portion.
As a result, the one side surface portions 411 and 421 and the screw surfaces 241 and 231 are in close contact with each other.

Next, the worker passes the three screws V, V, V through the three screw holes of the one side surface portion 411 in which the protruding surface portion 413 is fitted in the fitting groove 242, and the tread plate fixing tool 41 is put on the girder plate 24. Screw in. Similarly, the operator passes the three plate screws V, V, V through the three screw holes of the one side surface portion 421 in which the protruding surface portion 423 is fitted in the fitting groove 232, and puts the tread plate fixing tool 42 into the girder plate. Screw to 23. As a result, the lowermost tread 31 is fixed to the girders 23 and 24 in the horizontal posture.
Here, the screwing direction of the tread plate fixtures 42 and 41 with respect to the girder plates 23 and 24 is perpendicular to the girder plates 23 and 24, but generally, a tool for screwing is arranged between the screw surfaces 231 and 241. Since there is enough space to do this, screwing is easy.

After the work of fixing the lowermost tread 31 is completed, the operator places the projecting surface 413 of each tread fixing 41 into the fitting groove 243 of the girder 24 in the direction of the white arrow as shown in FIG. Insert. In this case, the operator places the other side surface portion 412 of the tread board fixture 41 on the upper side, and inserts the protruding surface portion 413 from the opening portion of the screw surface 241 into the fitting groove 243 in a direction perpendicular to the screw surface 241. To do. At this time, the protruding surface portion 413 is fitted into the fitting groove 243 as a whole from the proximal end portion to the distal end portion. Similarly, the operator inserts the protruding surface portion 423 of each tread plate fixture 42 into a fitting groove (not shown) of the girder plate 23. At this time, the protruding surface portion 423 is fitted into the fitting groove entirely from the base end portion to the tip end portion.
As a result, the one side surface portions 411 and 421 and the screw surfaces 241 and 231 are in close contact with each other.

  Next, the operator passes the three screws V, V, V through the three screw holes of the one side surface portion 411 and screws the tread plate fixing tool 41 to the beam plate 24. Similarly, an operator passes the three screws V, V, V through the three screw holes of the one side surface portion 421 and screws the tread plate fixing tool 42 to the beam plate 23. As a result, the other side surface portions 412 and 422 of the tread board fixtures 41 and 42 are arranged in the horizontal direction at the same height with respect to the floor surface F.

After the fixing work of the {N-1} tread plate fixtures 41, 41,... And the tread plate fixtures 42, 42,. The back surface 312 of the tread plate 31 is placed on the other side surface portions 412 and 422 of the tread plate fixtures 41 and 42 (that is, the pair of left and right tread plate fixtures 41 and 42) arranged at the same height. The four screws V, V,... Are passed through the four screw holes in each of the other side surface portions 412 and 422, and the tread plate fixtures 41 and 42 are screwed to the tread plate 31. As a result, the tread plate 31 is fixed to the girders 24 and 23 in the horizontal posture.
Here, the screwing direction of the tread plate fixtures 41 and 42 with respect to the tread plate 31 is perpendicular to the tread plate 31, but a screw fixing tool is inserted between the back surface 312 of the tread plate 31 other than the lowermost step and the floor surface F. Screwing is easy because there is enough space for placement.

By the way, even if the distance between the screw surfaces 231 and 241 is slightly different depending on the vertical position of the girder plates 23 and 24, the tread plate fixtures 42 and 41 that are not integrated with the tread plate 31 are used as the girder plates 23 and 24. For fixing, the tread plate 31 is fixed to the girders 23 and 24 without any problem.
In addition, the separation distance (kick-up) between the back surface 312 of the bottom tread 31 and the floor surface F is generally set to about 230 mm or less. For this reason, if the screwing direction of the tread plate fixtures 41, 42 with respect to the bottom tread 31 is perpendicular to the tread 31, a screwing tool is disposed between the back surface 312 and the floor surface F. Is difficult. Accordingly, only when the lowermost tread 31 is fixed to the girders 23 and 24, the procedure different from the procedure of fixing the non-lower tread 31 to the girders 23 and 24 (ie, the tread 31 in the first embodiment is fixed). It is fixed by the procedure of fixing to the girders 21 and 22.

The operator performs the above-described fixing operation of the tread plate 31 to the tread plate fixing tools 41 and 42 from the lowest level to the second level tread plate 31, and then executes from the lowest level to the third level tread plate 31. ... Finally, the process is executed on the uppermost tread 31. As a result of the above, the tread plates 31, 31,... Are fixed to the beam plates 23, 24 in a step shape.
In the present embodiment, the procedure for fixing the treads 31, 31,... In order from the bottom to the top is illustrated, but the present invention is not limited to this. For example, a procedure of fixing in order from the top to the bottom may be used.

  The exposed staircase 12 as described above has the same effect as the exposed staircase 11 of the first embodiment. Instead of the tread 31, the exposed staircase 12 may be configured using a tread having a rectangular concave positioning portion formed on the back surface, such as the tread 32 of the first embodiment.

  In the case of the exposed staircase 12, the tread plate fixtures 41, 42 are arranged outside the girder plates 24, 23, and it is not necessary to arrange a screw-fastening tool between the girder plates 24, 23. , 42 is advantageous in that it does not hinder the work of screwing. Further, for example, with respect to the girder 24, since the fitting grooves 243, 243,... Except the lowermost fitting groove 242 are not opened on the side end surface of the long side portion 24c, the fitting grooves 243, 243,. It is not noticeable and the beauty can be improved (see FIGS. 11 and 14).

In addition, the structure which fixes each tread board fixing tools 41 and 42 and the tread board 31 in the state which has arrange | positioned the girder plates 23 and 24 right and left reversely may be sufficient.
By the way, when assembling the exposed staircase 11 according to the first embodiment, the operator inserts the projecting surface portions 413 and 423 of the tread plate fixtures 41 and 42 into the fitting grooves 212 and 222 other than the lowermost step, and the one side surface portion 411. , 421 may be screwed to the girder plates 21, 22 and then the tread plate 31 may be screwed to the other side surface portions 412, 422.

Embodiment 3. FIG.
FIG. 15 is a perspective view showing a configuration of an exposed staircase according to Embodiment 3 of the present invention.
In the figure, reference numeral 13 denotes an exposed staircase, and the exposed staircase 13 is installed indoors, for example, in a two-story building.
The exposed staircase 13 is composed of one girder plate 20, N treads 31, 31,..., N tread fixings 41, 41,... Arranged on the right side and N treads arranged on the left side. .. Are provided symmetrically.
The dimensions and shapes of the treads 31, the tread board fixtures 41, and the tread board fixtures 42 are the dimensions and shapes of the treads 31, the tread board fixtures 41, and the tread board fixtures 42 of the first and second embodiments. Equal to.

The girder 20 has the same dimensions and outer shape as the girder 24 of the second embodiment except for the plate thickness, and is laid between the first floor and the second floor, like the girder 24.
However, the plate thickness of the girder plate 20 is more than twice the plate thickness of the girder plate 24. Further, both sides of the beam plate 20 are used as screw surfaces 201 and 204.
In the screw surface 201, for example, N fittings similar to one fitting groove 242 and {N-1} fitting grooves 243, 243,... Formed in the screw surface 241 of the second embodiment. Grooves are formed. Similarly, the screw surface 204 has N fittings similar to one fitting groove 232 and {N-1} fitting grooves (not shown) formed in the screw surface 231 of the second embodiment. Grooves are formed.

The configuration of the exposed staircase 13 is different from the configuration of the exposed staircase 12 of the second embodiment only in that the number of girders is small, and therefore, it is assembled in the same procedure as the procedure of assembling the exposed staircase 12 of the second embodiment. be able to.
In addition, when the fitting grooves similar to the fitting grooves 212, 212,... And the fitting grooves 222, 222,. It can assemble in the procedure similar to the assembly procedure of the exposure staircase 11.
Other parts corresponding to those of the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

  The exposed staircase 13 as described above has the same effect as the exposed staircases 11 and 12 of the first and second embodiments. Instead of the tread 31, the exposed staircase 13 may be configured using a tread having a rectangular concave positioning portion formed on the back surface, such as the tread 32 of the first embodiment.

  In the case of the exposed staircase 13, there is an advantage that it is easy to screw the tread plate fixing tools 41 and 42 because it is not necessary to arrange a screw fixing tool between the two girder plates. In addition, even if there is a wall surface of the building in the vicinity of the right side or the left side of the place where the exposed staircase 13 is installed, a tool for screwing is arranged between the wall surface and the screw surfaces 201 and 204. Since there is a sufficiently large space, there is an advantage that there is no problem in the work of screwing the tread board fixing tools 41 and 42. Furthermore, the exposed staircase 13 is more open than the exposed staircases 11 and 12 of the first and second embodiments.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is not intended to include the above-described meanings, but is intended to include meanings equivalent to the claims and all modifications within the scope of the claims.
Moreover, as long as the effect of the present invention is obtained, each of the exposed steps 11 to 13 may include a component that is not disclosed in the first to third embodiments.

It is a perspective view which shows the structure of the exposure staircase which concerns on Embodiment 1 of this invention. It is a front view which shows the structure of the exposure staircase which concerns on Embodiment 1 of this invention. It is sectional drawing of the III-III line in FIG. It is a side view which shows the structure of the beam board used for the assembly of the exposure staircase which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the tread used for the assembly of the exposure staircase which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the tread fixing tool used for the assembly of the exposure staircase which concerns on Embodiment 1 of this invention. It is explanatory drawing (the figure explaining erection of a digit board) of the assembly method of the exposure staircase which concerns on Embodiment 1 of this invention. It is explanatory drawing (the figure explaining integration of a tread board and a tread board fixing tool) of the assembly method of the exposure staircase which concerns on Embodiment 1 of this invention. It is explanatory drawing (the figure explaining fixation of the tread plate fixing tool with respect to a girder) of the assembly method of the exposure staircase which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the exposure staircase which concerns on Embodiment 2 of this invention. It is a front view which shows the structure of the exposure staircase which concerns on Embodiment 2 of this invention. It is sectional drawing of the XII-XII line | wire in FIG. It is a side view which shows the structure of the digit board used for the assembly of the exposure staircase which concerns on Embodiment 2 of this invention. It is explanatory drawing (the figure explaining fixation of the tread plate fixing tool with respect to a girder) of the assembly method of the exposure staircase which concerns on Embodiment 2 of this invention. It is a perspective view which shows the structure of the exposure staircase which concerns on Embodiment 3 of this invention. It is a perspective view which shows the structure of the conventional exposure staircase.

Explanation of symbols

11, 12, 13 Exposure staircase 20, 21, 22, 23, 24 Girder plate 201, 204, 211, 221, 231, 241 Screw surface (one surface)
212, 222, 232, 242, 243 Mating groove 31, 32 Tread plate 41, 42 Tread plate fixture 411, 421 One side surface portion 412, 422 Other side surface portion 413, 423 Protruding surface portion (protruding portion)
B frame (upper)
F Floor (bottom)
V screw

Claims (5)

Between the upper and lower stages of a building having an upper stage and a lower stage, one or two girder plates whose longitudinal direction is inclined and one surface is installed in a vertical posture;
A plurality of treads fixed in a staircase in a horizontal posture on the girders,
An exposed staircase comprising: an angled tread board fixing tool, wherein each tread is fixed to the girder, one side is screwed to the one surface, and the other side is screwed to the lower surface of the tread In
A protruding portion that protrudes outward from the angle longer than the plate thickness of the tread plate fixture is integrally provided at the tip of the one side surface portion,
An exposed staircase, wherein a fitting groove having a depth and a width corresponding to a protruding amount and a plate thickness of the protruding portion and having the protruding portion fitted therein is formed on the one surface.   A lowermost fitting groove into which a projecting portion of a tread plate fixing tool for fixing a lowermost tread plate to the girder plate is fitted is also opened in an upper side end surface of the girder plate. The exposed staircase according to claim 1. Between the upper and lower stages of a building having an upper stage and a lower stage, one or two girder plates whose longitudinal direction is inclined and one surface is installed in a vertical posture;
A plurality of treads fixed in a staircase in a horizontal posture on the girders,
An exposed staircase comprising: an angled tread board fixing tool, wherein each tread is fixed to the girder, one side is screwed to the one surface, and the other side is screwed to the lower surface of the tread In the assembly method of
As the tread board fixing tool, a tread board fixing tool is provided in which a protruding part that protrudes outward from the angle longer than the thickness of the tread board fixing tool is integrally provided at the tip of one side surface part,
The girder plate has a depth and a width corresponding to the projection amount and plate thickness of the projection, and a fitting groove into which the projection is fitted is formed on the one surface, and should be the lowest level. The lowermost fitting groove into which the protruding portion of the tread plate fixing tool that fixes the tread plate to the girder is fitted also opens to the side end surface that becomes the upper side when the girder plate is erected. Prepare the girder board
The girder is laid between the upper stage and the lower stage such that the longitudinal direction is inclined, the one surface is in a vertical posture, and the side end surface is on the upper side,
When the other side surface portion of the tread plate fixing tool is fixed to the girder plate of the tread plate to be the lowest step, it is screwed to the surface that becomes the lower surface,
The projecting portion of the tread plate fixture is inserted into the lowermost fitting groove from the opening portion of the side end surface,
A method for assembling an exposed staircase, characterized in that one side surface portion of the tread board fixture is screwed to the one surface. After installing the girder,
The protruding portion of the tread plate fixing tool other than the tread plate fixing tool that fixes the tread plate to be the lowest step to the girder plate is inserted into the fitting groove other than the lowermost fitting groove,
Screw one side of the treadle fixture on the one side,
4. The method of assembling an exposed staircase according to claim 3, wherein the other side surface portion of the tread plate fixing tool is screwed to a lower surface of a tread plate other than the tread plate to be the lowest step. As the girder, prepare a girder that is open to the side end face also fitting grooves other than the lowermost fitting groove,
After installing the girder,
When the other side surface portion of the tread plate fixing tool other than the tread plate fixing tool for fixing the tread plate to be the lowest step to the girder plate is fixed to the girder plate of the tread plate other than the tread plate to be the lowest step, it becomes the lower surface. Screw it to the side surface,
The projecting portion of the tread plate fixing tool is inserted into the fitting groove from the opening portion of the side end surface,
4. The method of assembling an exposed staircase according to claim 3, wherein one side portion of the tread board fixing tool is screwed to the one surface.

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