JP4999479B2 - Precut open staircase - Google Patents

Description

  The present invention relates to an open stair having a wooden side girder and a wooden step board fixed to the upper part of the side girder, and in particular, the side girder and the tread board are joined by a metal joint, and the angle or length The present invention relates to a pre-cut open stair that allows members to be easily processed even in different staircase shapes and allows common use of members such as treads, side girders, and joints.

  In recent years, an open staircase with a design as an interior has been put on the market instead of the conventional box-shaped staircase. As this kind of open staircase, those shown in Patent Documents 1 to 3 are known, but these are all unit-type precut open staircases having a fixed shape, and the following problems was there.

  For example, in Patent Document 1, not only the receiving portion is different for each step inclination, but also the processing to the tread is complicated and takes time and effort.

  Moreover, although what is shown by patent document 2 is easy to assemble as a staircase, since the angle of a staircase is determined in the form of a tread board support member, it cannot respond flexibly to various construction sites.

  Furthermore, since the angle is determined by the bolt through hole provided at the support end of the tread plate receiving material, the one disclosed in Patent Document 3 cannot flexibly deal with various sites as in Patent Documents 1 and 2.

  In order to solve the above problem, various pre-cut open stairs have been proposed in the past, for example, as shown in Patent Documents 4-7. In Patent Documents 4 and 5, an attachment hole is provided at a predetermined position of the hanging piece of the tread plate holder, and a guide hole is provided in a side beam corresponding to the attachment hole. Therefore, it is possible to realize an arbitrary angle according to the site with respect to the side beam. In particular, in the thing of patent document 5, since the tread is attached with the U-shaped clamping tool, it can be attached stably.

Further, in Patent Documents 6 and 7, since the joint metal is a bent product of a metal plate and the tread is placed on the side girders, there is no problem with respect to the mounting strength of the treads to the side girders.
JP-A-2005-30082 JP 2005-299089 A JP 2005-315031 A JP 2006-97383 A (particularly claim 3) JP 2006-97384 A (particularly claim 2) JP 2006-177053 A JP 2006-322304 A

  However, in the thing of patent document 4, since support of a tread board attachment member is supported only by shearing forces, such as a wood screw and a nail, there exists a problem that a screw, a nail, etc. are easy to loosen and it is easy to generate a squeaking sound.

  Moreover, in the thing of the patent document 5, it is hard to say that the work-saving workability is considered by all means, such as requiring the troublesome thing to attach with a U-shaped clamping tool.

  Furthermore, in the thing of the patent document 6, since the notch process with respect to a side girder is large, the intensity | strength of stair itself is not so strong for the need for a side girder of a big dimension, and there is a waste of resources.

  Moreover, in the thing of patent document 7, the notch process with respect to a side girder becomes complicated, and also a complicated recessed part process is given to a metal and a wood, Since it is the construction by those fitting, a very delicate processing precision is calculated | required. There is a drawback that it is difficult to fit at the time of construction due to moisture absorption / release of side girders and slight deviation in dimensional accuracy. In order to solve this problem, there is a problem that if the concave portion is made a little larger, it is fixed only by the shearing force of the fixture as in Patent Document 4.

  The present invention has been made in view of such various points. The purpose of the present invention is to share a side girder, a tread plate provided on the side girder, and a joining metal fitting for joining the side girder and the tread plate with members common to all construction sites. The purpose of this is to provide a pre-cut open staircase that takes into account the labor-saving work when assembling at the site.

  In order to achieve the above object, according to the present invention, a fitting groove is formed on the side face of the side beam, and a metal tread joining tool having a load receiving piece fitted into the fitting groove is provided. The treadle was attached to the side girders via a tool.

  Specifically, the invention of claim 1 is intended for a pre-cut open stair comprising a wooden side girder, a plurality of wooden treads, and a plurality of metal tread plate joints for attaching the treads to the side girders. is there.

  And each said tread board connector is extended so that it may hang down from at least one of the tread board fixed piece attached to the lower surface of the said tread board with an attachment hole, and the right-and-left side edge of this tread board fixed piece, and is attached to the side surface of the said side beam A side girder fixing piece attached by a hole and a load receiving piece extending from the side girder fixing piece so as to be perpendicular to the side girder fixing piece.

  In addition, a floor surface mounting portion that is attached to the floor surface is provided at the lower end portion of the side beam, while a floor mounting portion that is attached to the floor is provided at the upper end portion, and a side surface of the intermediate portion is provided. Has a width that allows the load receiving piece of the tread plate connector to be fitted, and a plurality of connector fitting grooves having one end reaching the upper edge surface of the side beam are provided at predetermined intervals in the side beam length direction. It has been.

Further, in the state where each of the treads is attached to the side girders by the tread board joints, the tread board fixing pieces of the tread board joints are in contact with the lower surface of the tread board and fixed by the fixing tools through the attachment holes, and the side girder fixing pieces are Attached to the side girder side surface and fixed by a fixture through a mounting hole, the load receiving piece is fitted into the fitting fitting groove so that the load applied to the tread is received by the fitting fitting groove. It is characterized by being.

  According to the above configuration, when constructing a pre-cut open staircase, according to the construction site, the floor surface mounting portion is processed at the lower end of the side beam and the upper mounting portion is processed at the upper end portion. After a plurality of fitting fitting grooves are formed on the side surface, for example, the tread plate fixing piece of the tread plate bonding device is brought into contact with the lower surface of the tread plate and fixed by the fixing device through the mounting hole, and formed on the side surface of the side beam. Insert and fit the load receiving piece of the tread plate connector into each of the plurality of connector fitting grooves, and in that state, the side girder fixing piece of the tread plate connector is brought into contact with the side surface of the side girder and attached. By fixing with a fixing tool through the hole, the tread plate is attached to the side beam via the tread plate connector.

  For this reason, at the construction site, once the construction angle of the tread plate joint with respect to the side girders is determined, the floor surface mounting part and the floor mounting part are formed and fitted to the side girders according to the site. It is only necessary to form the grooves, and after that, it is only necessary to fix the treads to the side girders via tread plate joints. Also, at least the side girders, each tread board, and tread board joints (for the left side and for the right side) should be prepared in the same way, and the joint fitting groove should be formed on the side of the side girder according to the construction site. Components can be shared at the construction site. In this case, since the shape of the tread board connector is fixed, the inclination of the connector fitting groove is adjusted in accordance with each site so that the tread board is attached horizontally.

Further, the load receiving piece of each tread plate connector is inserted into the connector fitting groove of the side beam so that the load applied to the tread plate is received by the connector fitting groove, and a part of the tread plate connector is inserted by the side beam. Since it is supported, the load on the tread is dispersed, and even if aged load is applied, the tread connector is difficult to loosen and squeak noise is unlikely to occur.

  According to a second aspect of the present invention, in the pre-cut open staircase of the first aspect, the tread plate joint is fixed to two side girders that hang down from both left and right ends of the tread plate fixing piece with an interval that allows the side girders to be externally fitted. A load receiving piece extends from at least one of the side beam fixing pieces. Further, a connector fitting groove for fitting the load receiving piece is provided on at least one of the left and right side surfaces of the side beam.

  According to this invention, the two side girder fixing pieces of the tread plate connector are fitted outside so as to sandwich the side girder from both the left and right sides, abut against the left and right side surfaces of the side girder, and extend from at least one of the side girder fixing pieces. The receiving piece is fitted into at least one fitting fitting groove on the left and right side surfaces of the side beam. As described above, the side plate fixing piece of the tread plate connector is externally fitted so as to sandwich the side beam from the left and right sides and is fixed to the side beam by the fixing device, so that the tread plate can be firmly attached to the side beam.

  According to a third aspect of the present invention, in the precut open staircase according to the first or second aspect, the load receiving piece of the tread plate joint is provided to extend substantially in the horizontal direction at the lower end of the side beam fixing piece. . Moreover, the joint fitting groove of the side beam is provided in parallel with the floor surface.

  According to the present invention, the load receiving piece of the tread board joint extends substantially in the horizontal direction, and the joint fitting groove of the side beam is provided in parallel with the floor surface. When the load receiving piece is fitted in the joint fitting groove of the side beam, the load applied to the tread plate can be distributed and received by the joint fitting groove of the side beam.

  According to a fourth aspect of the present invention, in the precut open staircase according to the first or second aspect, the load receiving piece of the tread plate connector is provided so as to extend substantially vertically in the rear end portion of the side beam fixing piece. The fitting fitting groove of the girder is provided so as to be perpendicular to the floor surface so that the lower end portion does not reach the lower edge surface of the side girder. The load receiving piece of the connector is fitted so as to contact the lower end of the connector fitting groove.

  According to this invention, the load receiving piece of the tread plate connector extends substantially in the vertical direction so that the connector fitting groove of the side beam is perpendicular to the floor surface and the lower end portion does not reach the lower edge surface of the side beam. Therefore, when the load receiving piece of the tread plate connector is fitted into the joint fitting groove of the side beam in the construction state of the stairs, the load applied to the tread plate is Can be received at the lower end. Moreover, since the connector fitting groove extends in the vertical direction, the upper end portion reaching the upper edge surface of the side beam of the connector fitting groove is concealed on the lower side of the tread, and the appearance appearance can be enhanced. .

  According to a fifth aspect of the present invention, in the precut open staircase according to the first or second aspect, the load receiving piece of the tread plate joint is provided so as to extend obliquely to the rear end portion of the side girder fixing piece. The fitting groove is provided so as to be inclined with respect to the floor surface so that the lower end portion does not reach the lower edge surface of the side girders. The load receiving piece is fitted so as to come into contact with the lower end of the connector fitting groove.

  According to the present invention, the load receiving piece of the tread plate joint extends obliquely, and the joint fitting fitting groove of the side beam is provided so as to be inclined with respect to the floor surface and the lower end portion does not reach the lower edge surface of the side beam. Therefore, the load applied to the treadle when the load receiving piece of the treadle joint is fitted into the joint fitting groove of the side beam in the construction state of the staircase, the lower end of the joint fitting groove of the side beam Or it receives in a distributed manner on the lower surface of the fitting fitting groove. On the other hand, since the connector fitting groove extends obliquely, the upper end portion reaching the upper edge surface of the side beam of the connector fitting groove is concealed on the lower side of the tread. As a result, the load distribution effect and the appearance appearance can be improved together.

  According to a sixth aspect of the present invention, in the precut open stair according to any one of the first to fifth aspects, the tread board joint extends upward from the rear end portion of the tread plate fixing piece and contacts the rear end portion of the tread plate. Have a piece.

  According to the present invention, when fixing the tread plate connector to the tread plate, the tread plate positioning piece can be positioned by contacting the rear end portion of the tread plate.

  According to a seventh aspect of the present invention, in the precut open staircase of the sixth aspect, the tread board positioning piece is provided with a through hole, and the tread board positioning piece penetrates the through hole in a state of contacting the rear end surface of the tread board. It is fixed by a fixing tool.

  According to the present invention, the tread plate positioning piece is brought into contact with the rear end portion of the tread plate and the tread plate joint is positioned on the tread plate, and the tread plate is fixed by the fixing tool that penetrates the through hole. Thus, it is possible to position and fix the tread plate connector, and to effectively prevent the rear end portion of the tread plate from floating when the stairs are used.

  According to an eighth aspect of the present invention, in the pre-cut open staircase according to the sixth or seventh aspect, the tread plate connector has a tread lift prevention piece that extends forward from the upper end of the tread positioning piece. In addition, a lift prevention groove is provided on the rear end surface of the tread. When each tread is attached to a side beam by a tread plate joint, the tread lift prevention piece is fitted in the lift prevention groove. In the state, the tread board and the tread board fixing piece are integrated.

  According to the present invention, the tread plate and the tread plate fixing piece are integrated in a state where the tread plate lift prevention piece of the tread plate connector is fitted in the lift prevention groove on the rear end surface of the tread plate. Locking to the tread board lift prevention piece, it is possible to effectively prevent the rear end portion of the tread board from floating when the stairs are used.

In the invention of claim 9, in pre-cut open staircase of the claims 8, it said floating preventing groove is characterized by a groove shape which does not reach the cut end surface of the left and right ends of the step board.

According to the invention, it is possible to right and left end portions of the lift preventing groove is not exposed to the cut end surface of the left and right ends of the tread plate, enhancing the appearance of the appearance.

  In the invention of claim 10, the tread plate connector is formed by bending a metal plate having a certain thickness. If it carries out like this, productivity of a tread board connector can be improved.

As described above, according to the first to tenth aspects of the present invention, the load receiving piece of the tread plate connector attached to the tread plate applies the load applied to the tread plate to the connector fitting groove provided in the side beam. By being inserted so as to be received by the fitting groove, the construction angle of the connector with respect to the side beam is determined, and the construction is saved. In addition, since a part of the tread board joint is supported by the side girders, the load applied to the tread board is dispersed, and the tread board joint is difficult to loosen even after a lapse of time, and a pre-cut open staircase in which it is difficult to generate a squeaking noise is obtained.

  Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

[Embodiment 1]
FIG. 9 shows a pre-cut open staircase A according to Embodiment 1 of the present invention. This pre-cut open staircase A has a pair of left and right wooden side girders 1, 1, a plurality of wooden treads 8, 8,..., And a plurality of fixed thicknesses for attaching each tread 8 to each side girder 1. .. (See FIGS. 1 to 5).

(Side girders)
Each side girder 1 is made of wood material such as plywood or laminated wood. The surface is preferably subjected to painting or sheet pasting.

  As for this side beam 1, a substantially rectangular plate material is prepared as a member common to various construction sites, and is processed according to the construction site.

  Specifically, as shown in FIG. 6 and FIG. 7, a floor surface mounting portion 2 that is cut and mounted to be parallel to the floor surface is attached to the lower end portion of each side girder 1, and the upper end portion is also provided. Are each provided with an upstairs mounting portion 3 attached to the upstairs. That is, the floor surface mounting portion 2 that comes into contact with the floor surface and the upper floor mounting portion 3 that is mounted on the floor are respectively processed according to the mounting angle at the construction site.

  In addition, a plurality of connector fitting grooves 5, 5 are provided on the inner side surface (which may be the outer side surface on the left and right end portions side of the staircase A) of the staircase A in the middle portion of each side girder 1. Are provided at predetermined intervals in the side beam length direction. Each of the joint fitting grooves 5 has a width (a width slightly larger than the thickness of the footboard joint 12) capable of tightly fitting a load receiving piece 15 described later of the footboard joint 12. While tilting at a predetermined tilt angle θ (90−θ with respect to the vertical direction) with respect to the parallel horizontal direction, the upper end (one end) reaches the upper edge surface which is also the front edge surface of the side beam 1, while the lower end (others) The end portion is provided in the range of the upper portion of the side beam 1 so as not to reach the lower edge surface which is also the rear edge surface of the side beam 1.

  The depth of each connector fitting groove 5 is about 5 to 30 mm (5 mm or more and 30 mm or less), and preferably about 10 to 25 mm. If it is less than 5 mm, it is difficult to obtain the effect of supporting the load by the load receiving piece 15, and if the depth exceeds 30 mm, the notch to the side beam 1 must be increased and the cross-sectional dimension of the side beam 1 must be increased. Is inefficient.

(Tread board)
As the wooden tread board 8, for example, a substantially rectangular plate material that is long in the left-right direction, such as plywood or laminated material, is used. It is preferable that the surface is subjected to painting and sheet pasting similarly to the side beam 1.

  In the vicinity of the front end portion, which is the front portion of the upper surface (top surface) of the tread board 8, a non-slip portion made up of a plurality of concave or convex strips extending in the left-right direction (longitudinal direction) may be provided.

  As shown in FIG. 8, a lift prevention groove 9 extending in the length direction (horizontal direction) of the tread plate 8 is provided in, for example, an intermediate portion in the vertical direction that is the thickness direction of the rear end surface (back surface) of the tread plate 8. ing. The groove width of the anti-lifting groove 9 is a width (a width slightly larger than the thickness of the tread board connector 12) in which a later-described tread board anti-lifting piece 17 in the tread board connector 12 can be tightly fitted. The depth is such that the tread plate lift prevention piece 17 can be fitted.

The tread board lifting prevention groove 9 may be formed in one narrow groove shape that is continuous in the longitudinal direction of the rear end surface of the tread board 8, or a plurality of narrow grooves that are divided as shown in the figure and arranged in series in the length direction. Also good. Preferably, the tread plate lift prevention groove 9 is shaped so as not to reach the cuff surfaces 8a, 8a of the left and right ends of the tread plate 8 so that the processing is easy, and when the stair A is viewed from the left and right side surfaces, the tread plate 8 it does not appear to butt face 8a of the left and right ends of the step board 8 forming the treadle lift preventing groove 9 on the rear end face can be a staircase a having beautiful appearance.

(Tread board joint)
Each of the tread plate joints 12 is made of metal such as iron, stainless steel, and aluminum, and particularly, iron plated steel or stainless steel is suitable. When iron or stainless steel is used, the thickness of the tread connector 12 is about 1 to 6 mm (1 mm or more and 6 mm or less), preferably 1.5 to 4 mm (1.5 mm or more and 4 mm or less). ) Good degree. In the case of a metal plate thinner than 1 mm, there is a problem in strength, and a metal plate exceeding 6 mm is difficult to bend and difficult to use. In the case of aluminum, a thickness of about 2 to 6 mm (2 mm or more and 6 mm or less) is good, and preferably about 2 to 4 mm (2 mm or more and 4 mm or less).

  From the viewpoint of cosmetic properties and rust prevention, the surface of the tread connector 12 may be plated or colored. The tread board connector 12 is formed by a simple bending process in which a single metal plate having a certain thickness is bent into a predetermined shape, and is excellent in productivity.

  There are two types of the tread connector 12, one for the left side attached to the left side girder 1 and the other for the right side attached to the right side girder 1 (shown in the drawing). As shown in FIG. 5, a horizontally extending rectangular plate-shaped tread plate fixing piece 13 attached to the lower surface of the tread plate 8 and one of left and right side ends of the tread plate fixing piece 13 (the left side is for the right side and the right side Is bent so as to hang down from the left end, and extends downward, and is inclined so that the front and rear ends are directed downward toward the rear, and the side face of the side beam 1 (the left side beam 1 is used for the left side). Of the right side surface, and the right side plate is a substantially parallelogram-shaped plate-like side girder fixing piece 14 attached to the right side girder 1 and the side girder fixing piece from the inclined rear end of the side girder fixing piece 14. 14 on the same side as the tread plate fixing piece 13 (on the left side is the right side and on the right side is the left side) From the load receiving piece 15 that is bent and extended, the tread plate positioning piece 16 that is bent upward from the rear end portion of the tread plate fixing piece 13 and contacts the rear end surface of the tread plate 8, and the upper end portion of the tread plate positioning piece 16 It consists of a tread lift prevention piece 17 that is bent forward and extends in the horizontal direction.

  A plurality of mounting holes 13a, 13a,... For inserting screws B (see FIG. 1) as fasteners fastened and fixed to the lower surface of the tread plate 8 are provided in the tread plate fixing piece 13. In addition, a plurality of mounting holes 14a, 14a,... For inserting screws B as fasteners fastened and fixed to the side surfaces of the side girders 1 are formed so as to penetrate through the mounting holes 13a, 14a. B is inserted and fixed.

  As shown in FIG. 1, in a state in which each of the treads 8 is attached to each of the left and right side girders 1 by each of the left and right tread plate joints 12, the tread fixing pieces 13 of the tread board joints 12 are connected to the treads 8. Are fixed by screws B (fixing tools) that pass through the mounting holes 13a, 13a,..., And the side-girder fixing pieces 14 abut on the side surfaces of the side beams 1 and pass through the mounting holes 14a, 14a,. The load receiving piece 15 is fitted to each fitting fitting groove 5 so as to come into contact with the lower end portion thereof. In addition, the tread board positioning piece 16 is in contact with the rear end surface of the tread board 8 in a state where the tread board lifting prevention piece 17 is fitted in the lifting prevention groove 9, and the tread board 8 and the tread board fixing piece 13 are integrated. .

(Example of construction method)
Next, the construction method which constructs the pre-cut open staircase A of the said embodiment is illustrated. First, the left and right side girders 1 and 1 are attached at predetermined positions on the construction site. The floor surface mounting portion 2 at the lower end of each side beam 1 may be only placed on the floor surface, or the side surface of the side beam 1 may be fixed to the floor surface with a joint hardware (not shown). Absent. Further, the upper floor mounting portion 3 at the upper end portion may be cut into a predetermined shape and attached by a metal fitting (not shown), or may be attached by zoning or the like. In addition, a necessary number of connector fitting grooves 5, 5,... Are processed in the side beam 1 in accordance with the inclination of the stairs A at the construction site.

  The tread plate 8 is attached to the side beam 1 in order from the lower side. The tread board 8 is turned upside down, and the left and right tread board joints 12, 12 are attached to the back surface of the tread board 8 (the lower surface in the state after construction). Specifically, the tread plate positioning piece 16 of the left and right tread plate connector 12 is brought into contact with the rear end surface of the tread plate 8, and the tread plate lifting prevention piece 17 extending forward from the upper end portion of the tread plate positioning piece 16 is disposed behind the tread plate 8. It fits so that it may insert in the raising prevention groove | channel 9 of an end surface. In this state, the tread plate fixing piece 13 of the tread plate connector 12 is brought into contact with the back surface of the tread plate 8, and screws B are inserted into the mounting holes 13a, 13a,. One tread board connector 12 and the tread board 8 are fixed.

  At that time, since a tread plate positioning piece 16 extending upward from the rear end portion of the tread plate fixing piece 13 of the tread plate connector 12 is provided, by bringing the tread plate positioning piece 16 into contact with the rear end portion of the tread plate 8, The front and rear positions of the tread board connector 12 with respect to the tread board 8 can be easily positioned to fix the tread board connector 12 to the tread board 8.

  Thereafter, the other left and right tread plate joints 12 are mounted and fixed to the tread plate 8 in the same manner in accordance with the inner dimension between the opposing side beams 1 of the mounting width of the side beam 1.

  Further, the tread plate 8 to which the left and right tread plate joints 12 and 12 are attached in this way is reversed as before, and the joint fitting groove 5 on the side surface of each side girder 1 attached in advance is accommodated from the upper edge surface. The load receiving piece 15 of each tread plate connector 12 to be inserted is fitted, and in this state, screws B (fixers) are attached to the mounting holes 14a, 14a,. It is inserted and fastened to the side beam 1, and the tread plate 8 is fixedly integrated with the side beam 1 via the tread plate connector 12. A plurality of mounting holes 14 a, 14 a,... Of the side girder fixing piece 14 are provided. With the side girder fixing piece 14 in contact with the side surface of the side girder 1, a predetermined screw is attached to the side girder 1. All the mounting holes 14a, 14a,...

  The attachment of one tread 8 is completed as described above, and thereafter, the upper treads 8, 8,...

  Therefore, in this embodiment, at the construction site of the staircase A, the floor surface mounting portion 2 and the floor mounting portion 3 are formed on the side beam 1 according to the site and the fitting fitting groove to the side beam 1 is formed. Only the forming process of 5, 5,... Is required, and it is only necessary to fix the respective treads 8 to the side girders 1 via the tread connector 12 so that the construction can be saved at the time of assembly at the site. Also, the side girders 1, each tread board 8, and each tread board connector 12 (for the left side and for the right side) are prepared in the same way. Then, it is only necessary to form the joint fitting grooves 5, 5,... On the side surface of the side beam 1 in accordance with the construction site, so that the members can be shared in all construction sites.

  Further, since the load receiving piece 15 of each tread plate connector 12 is inserted into the connector fitting groove 5 of the side beam 1 and a part of the tread plate connector 12 is supported by the side beam 1, the load on the tread plate 8 is increased. Is distributed, and even if aged load is applied, the tread board connector 12 is difficult to loosen and it is difficult to generate squeaking noise.

  Further, the load receiving piece 15 of each tread plate connector 12 extends obliquely, the connector fitting groove 5 of the side beam 1 is inclined with respect to the floor surface, and the lower end portion does not reach the lower edge surface of the side beam 1. When the load receiving piece 15 of the tread plate connector 12 is fitted in the connector fitting groove 5 of the side beam 1 in the construction state of the stair A, the load applied to the tread plate 8 is applied to the side beam. 1 can be received in a distributed manner at the lower end of the connector fitting groove 5 or the lower surface of the connector fitting groove 5. On the other hand, since the connector fitting groove 5 extends obliquely, the upper end portion of the connector fitting groove 5 reaching the upper edge surface of the side beam 1 can be concealed by the tread plate 8. As a result, the load distribution effect and the appearance appearance can be improved together.

  Further, the tread connector 12 is formed with a tread lift prevention piece 17 extending in the horizontal direction forward from the upper end of the tread positioning piece 16, and a lift prevention groove 9 is provided on the rear end surface of the tread 8. In the state where each tread 8 is attached to the side beam 1 by the tread connector 12, the tread lift prevention piece 17 is fitted into the lift prevention groove 9, so that the rear end of the tread 8 is the tread lift prevention piece. 17 to be locked. As a result, when the staircase A is used, it is possible to effectively prevent the rear end portion of the tread plate 8 from floating.

[Embodiment 2]
10 to 16 show a second embodiment of the present invention (in the following embodiments, the same parts as those in FIGS. .. In which the load receiving pieces 15 and the joint fitting grooves 5, 5,...

  That is, in this embodiment, as shown in FIGS. 11 to 14, the side beam fixing piece 14 of each tread plate connector 12 is a substantially triangular plate shape, and its rear end portion extends in the vertical direction. A load receiving piece 15 is provided at a rear end portion of the fixed piece 14 so as to extend in a substantially vertical direction (substantially a vertical direction).

  On the other hand, as shown in FIGS. 15 and 16, the fitting fitting groove 5 of each side beam 1 is provided in the vertical direction perpendicular to the floor surface so that the lower end portion does not reach the lower edge surface of the side beam 1. In the state where each tread plate 8 is attached to the side beam 1 by the tread plate connector 12, the load receiving piece 15 of the tread plate connector 12 is fitted so as to come into contact with the lower end portion of the connector fitting groove 5. Yes. Other configurations are the same as those of the first embodiment.

  Therefore, in the second embodiment, the load receiving piece 15 of the tread plate connector 12 extends substantially in the vertical direction, the connector fitting groove 5 of the side beam 1 is perpendicular to the floor surface, and the lower end is below the side beam 1. Since it is provided so as not to reach the edge surface, the load receiving piece 15 of the tread plate connector 12 is fitted in the connector fitting groove 5 of the side beam 1 in the construction state of the staircase A as shown in FIG. When this is done, the load applied to the tread plate 8 is received at the lower end of the connector fitting groove 5 of the side beam 1. Further, since the connector fitting groove 5 extends in the vertical direction, the upper end portion of the connector fitting groove 5 reaching the upper edge surface of the side beam 1 is concealed by the tread plate 8, and the appearance appearance is enhanced. it can.

  Moreover, the side spar 1, each tread board 8, and tread board connector 12 should prepare the same thing, and should just form the connector fitting groove | channel 5, 5, ... on the side surface of the side beam 1, according to a construction site, Common parts can be used at all construction sites. In addition, the same effects as those of the first embodiment can be achieved.

  In the configurations of the first and second embodiments, the fitting fitting grooves 5, 5,... Of the side beam 1 are provided so as to reach the lower edge surface (rear edge surface) of the side beam 1. It is not included in the present invention. That is, in such a configuration, the load of the load receiving piece 15 of the tread plate connector 12 cannot be received by the lower end portion of the connector fitting groove 5, and the load holding function is not provided.

[Embodiment 3]
17 to 23 show the third embodiment, in which each direction of the load receiving piece 15 of the tread plate connector 12 and the connector fitting grooves 5, 5,...

  That is, in this embodiment, as shown in FIGS. 18 to 21, the side girder fixing piece 14 of the tread plate connector 12 is a substantially parallelogram-like plate like the first embodiment, and this side girder fixing piece. A load receiving piece 15 is provided at a lower end portion of 14 so as to extend in a substantially horizontal direction (substantially horizontal direction).

  On the other hand, each side girder 1 is provided with a fitting fitting groove 5 extending in the horizontal direction parallel to the floor surface. Unlike the first and second embodiments, this fitting fitting groove 5 is provided on the side girder 1. It is provided so as to cover the entire width direction of the side beam 1 from the upper edge surface (front edge surface) to the lower edge surface (rear edge surface). It may be provided so as to reach only the upper edge surface (front edge). Other configurations are the same as those of the first embodiment.

  Therefore, in the case of this embodiment, the load receiving piece 15 of the tread plate connector 12 extends substantially in the horizontal direction, and the connector fitting groove 5 of the side beam 1 is provided in parallel with the floor surface. When the load receiving piece 15 of the tread plate connector 12 is fitted into the connector fitting groove 5 of the side beam 1 in the construction state, the load applied to the tread plate 8 is applied to the connector fitting groove 5 of the side beam 1. The connector fitting groove 5 may be provided so as to extend over the entire side beam 1 from the upper edge surface to the lower edge surface of the side beam 1. Other functions and effects are the same as those of the first embodiment.

[Embodiment 4]
24 to 27 show the fourth embodiment. In this embodiment, unlike the first to third embodiments, as shown in FIGS. 24 to 26, the left and right tread board joints 12 have two left and right sides depending from the left and right ends of the tread board fixing piece 13. Girder fixing pieces 14, 14 are provided. These side girder fixing pieces 14 and 14 are both substantially parallelogram-like plates similar to those of the third embodiment, and are opposed to each other with an interval where the side girder 1 can be externally fitted. Has been placed. Then, a load receiving piece 15 extending in the horizontal direction at the lower end of each side girder fixing piece 14 is directed to the opposite side girder fixing piece 14 (to the left side girder fixing piece 14). The right side girder fixing piece 14 is bent and formed on the right side.

  On the other hand, as shown in FIG. 27, joint fitting grooves 5 and 5 extending in the horizontal direction are formed on the left and right side surfaces of the left and right side girders 1 so as to correspond to the left and right. The load receiving pieces 15 and 15 on both the left and right sides are inserted into the grooves 5 and 5, respectively, so as to be fitted. Other configurations are the same as those in the third embodiment.

  Therefore, in the case of this embodiment, in addition to obtaining the effects of the third embodiment, the left and right side girder fixing pieces 14 and 14 of each tread plate connector 12 are externally fitted so as to sandwich the side girder 1 from both left and right sides. Thus, there is an advantage that the tread plate 8 can be firmly attached to the side beam 1 by being screwed.

  In this embodiment, the load receiving pieces 15 and 15 are formed on the two side beam fixing pieces 14 and 14, respectively. However, the load receiving piece 15 is formed only on one of the side beam fixing pieces 14, The fitting fitting groove 5 of the side beam 1 may also be provided only on the side surface on the side where the load receiving piece 15 is present (modified example).

  Further, as in the first to third embodiments, in the configuration in which the load receiving piece 15 of the tread plate connector 12 and the connector fitting grooves 5, 5,... Similarly to the fourth embodiment (including the above-described modification), it is also possible to provide two side-girder fixing pieces 14 and 14.

[Other Embodiments]
In addition, this invention is not limited to the said embodiment, Various other embodiment is included. For example, in each of the above embodiments, the tread plate lift prevention piece 17 of the tread plate connector 12 is inserted into the lift prevention groove 9 on the rear end surface of the tread plate 8, but instead, the tread plate lift prevention piece 17 is eliminated. A plurality of through holes for inserting screws B (fixing tools) are formed in the tread positioning piece 16 and the tread positioning piece 16 is positioned in contact with the rear end surface of the tread 8 in the state where the tread positioning piece 16 is positioned. The screw B may be inserted into the through-hole 16 and fastened to the rear end surface of the tread plate 8, and the rear of the tread plate 8 is used when the staircase A is used as in the case where the tread plate lift prevention piece 17 is provided. It is possible to effectively prevent the end portion from floating.

  Further, the tread board positioning piece 16 does not necessarily need to be fixed to the tread board 8 with the screw B, and the tread board positioning piece 16 may be brought into contact with the rear end surface of the tread board 8. In the present invention, the tread board positioning piece 16 and the tread board lifting prevention piece 17 are not essential components and can be omitted as necessary.

  Of course, the tread plate fixing piece 13, the side girder fixing piece 14, and the load receiving piece 15 of the tread plate connector 12 are not limited to the shapes of the above embodiments.

  In the present invention, pre-cut open staircases can be used in common at all construction sites, and it is only necessary to perform simple processing of side girders according to the site. Therefore, it is extremely useful and has high industrial applicability.

FIG. 1 is a side view showing a state in which a tread plate is attached to a side beam in a pre-cut open staircase according to Embodiment 1 of the present invention. FIG. 2 is an enlarged perspective view of the tread connector according to the first embodiment. FIG. 3 is an enlarged front view of the footboard connector according to the first embodiment. FIG. 4 is an enlarged plan view of the tread connector according to the first embodiment. FIG. 5 is an enlarged side view of the footboard connector according to the first embodiment. FIG. 6 is a side view showing the entire side beam. FIG. 7 is a perspective view showing a part of the side beam as seen from the front side. FIG. 8 is a front view seen from the rear side with a part of the tread board omitted. FIG. 9 is a perspective view showing a part of the pre-cut open staircase. FIG. 10 is a view corresponding to FIG. FIG. 11 is a view corresponding to FIG. FIG. 12 is a view corresponding to FIG. FIG. 13 is a view corresponding to FIG. FIG. 14 is a view corresponding to FIG. FIG. 15 is a view corresponding to FIG. FIG. 16 is a view corresponding to FIG. FIG. 17 is a view corresponding to FIG. FIG. 18 is a view corresponding to FIG. FIG. 19 is a view corresponding to FIG. FIG. 20 is a view corresponding to FIG. FIG. 21 is a view corresponding to FIG. FIG. 22 is a view corresponding to FIG. FIG. 23 is a view corresponding to FIG. FIG. 24 is a view corresponding to FIG. FIG. 25 is a view corresponding to FIG. FIG. 26 is a view corresponding to FIG. FIG. 27 is a view corresponding to FIG.

A Pre-cut open stair 1 Side girder 2 Floor mounting part 5 Joint fitting groove 8 Tread board 8a Small face 9 Lifting prevention groove 12 Tread board joint 13 Tread board fixing piece 13a Mounting hole 14 Side girder fixing piece 14a Mounting hole 15 Load receiving Piece 16 Tread plate positioning piece 17 Tread plate lifting prevention piece B Screw (fixing tool)

Claims (10)

A pre-cut open stair comprising a wooden side girder, a plurality of wooden treads, and a plurality of metal tread fittings for attaching the treads to the side girders,
Each of the tread plate joints extends so as to hang from at least one of the left and right side ends of the tread plate fixing piece and the left and right side ends of the tread plate fixing piece. A side girder fixing piece that is attached to the side girder, and a load receiving piece that extends from the side girder fixing piece so as to be perpendicular to the side girder fixing piece,
The lower end of the side beam is provided with a floor mounting portion that is attached to the floor, while the upper end is provided with a floor mounting portion that is mounted on the floor, and on the side surface of the intermediate portion, A plurality of fitting fitting grooves each having a width capable of fitting the load receiving piece of the tread plate fitting and having one end reaching the upper edge surface of the side beam are provided at predetermined intervals in the side beam length direction. And
In a state where each of the treads is attached to the side beam by the tread plate connector, the tread plate fixing piece of the tread plate connector contacts the lower surface of the tread plate and is fixed by the fixing device through the mounting hole, and the side girder fixing piece is fixed to the side beam. The load receiving piece is fitted to the fitting fitting groove so that the load applied to the tread is received by the fitting fitting groove. Pre-cut open staircase characterized by In the pre-cut open stair of claim 1,
The tread board connector has two side girder fixing pieces that hang down from both left and right ends of the tread board fixing piece with an interval that allows the side girder to be externally fitted, and receives load from at least one of the side girder fixing pieces. The piece is extended,
A precut open staircase, wherein a fitting fitting groove for fitting the load receiving piece is provided on at least one of the left and right side surfaces of the side beam. In the pre-cut open stair of Claim 1 or 2,
The load receiving piece of the tread plate connector is provided to extend substantially in the horizontal direction at the lower end of the side beam fixing piece,
The precut open staircase characterized in that the joint fitting groove of the side beam is provided in parallel with the floor surface. In the pre-cut open stair of Claim 1 or 2,
The load receiving piece of the tread plate connector is provided to extend substantially vertically in the rear end portion of the side beam fixing piece,
The side-girder fitting fitting groove is provided perpendicular to the floor surface so that the lower end does not reach the lower edge surface of the side beam,
A pre-cut open staircase characterized in that in a state where each tread plate is attached to a side beam by a tread plate connector, a load receiving piece of the tread plate connector is fitted so as to abut on a lower end portion of the connector fitting groove. . In the pre-cut open stair of Claim 1 or 2,
The load receiving piece of the tread plate connector is provided to extend obliquely at the rear end of the side beam fixing piece,
The fitting fitting groove of the side beam is provided so as to be inclined with respect to the floor surface and the lower end portion does not reach the lower edge surface of the side beam,
A pre-cut open staircase characterized in that in a state where each tread plate is attached to a side beam by a tread plate connector, a load receiving piece of the tread plate connector is fitted so as to abut on a lower end portion of the connector fitting groove. . In the pre-cut open stair of any one of Claims 1-5,
The tread board connector has a tread positioning piece extending upward from a rear end portion of a tread plate fixing piece and abutting the rear end portion of the tread plate. In the pre-cut open stair of Claim 6,
The treadle positioning piece has a through hole,
The pre-cut open staircase, wherein the tread positioning piece is fixed to the tread by a fixture that penetrates the through hole in a state where the tread positioning piece is in contact with the rear end surface thereof. In the pre-cut open stair of claim 6 or 7,
The tread connector has a tread lift prevention piece extending forward from the upper end of the tread positioning piece,
A lift prevention groove is provided on the rear end surface of the tread,
When the treads are attached to the side girders by tread joints, the tread plate and the tread plate fixing piece are integrated with the tread plate lift prevention piece fitted in the lift prevention groove. Pre-cut open staircase. In the pre-cut open stair of claim 8,
Floating preventing groove is pre-cut open staircase, characterized in that the groove shape does not reach the cut end surface of the left and right ends of the step board. In the pre-cut open stair of any one of Claims 1-9,
The pre-cut open staircase, wherein the tread plate connector is formed by bending a metal plate having a certain thickness.

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