Assembled stairs and assembly method for assembled stairs

Abstract

Conventionally, in steel stringer staircases, which are common, regardless of whether they are straight or spiral in shape, the fixed parts on the upper floor side of the stringer are weak, and because they are not a grid structure, they have low rigidity. In the case of spiral staircases, the bending process to create the spiral, as well as the transportation and assembly of long members, are complicated. [Solution] The present invention allows for an increase in the number of rows of horizontal main beams, making the fixing part on the upper floor side stronger. The transverse members fixed to the flange surface of the horizontal main beams, the horizontal main beams, and the inclined members form a three-dimensional lattice structure, increasing rigidity. Furthermore, in the case of a spiral, there is no bending of the constituent members, such as the horizontal main beams, transverse members, and inclined members, into a spiral shape, and there is no need to transport long members, so it can be assembled simply and accurately.

Description

Technical Field

[0001] The present invention relates to an assembled staircase having a linear and spiral girder structure, which is easy to process, transport and assemble, has excellent deformation reduction properties, high design expandability and is stylish, and a method for assembling the assembled staircase.

Background Art

[0002] The classification and advantages and disadvantages of staircases having a linear and spiral girder structure will be described below. Currently, modern staircases having a girder structure include steel and wooden side girder staircases, force girder staircases, box girder staircases, staircases having an RC (Reinforced Concrete) structure, and the like. Conventionally, the main building structures of commercial buildings include steel frame structures and RC structures. When the building structure is a steel frame structure, the staircase structure mainly consists of steel side girder staircases. When the building structure is an RC structure, steel side girder staircases or site-cast RC structure staircases with high labor costs and long construction periods and few examples are known. On the other hand, the main building structures of houses include steel frame structures, PCaRC (Precast Reinforced Concrete) wall floor structures, site-cast RC structures, wooden structures, and the like. In the staircase structure, in many cases, the staircase itself is integrated with the interior wall to relieve the stress concentration at the fixing part of the upper floor and has an area-saving effect. It often becomes a non-girder-structured linear staircase such as a wooden or steel folded staircase or a surrounding staircase. Therefore, it is difficult to adopt a pure girder-structured staircase or a spiral girder-structured staircase that looks good in the living room, and the design freedom is low.

[0003] In any case, conventionally, generally, linear girder-structured staircases mostly consist of steel side girder staircases with simple structures, and stylish force girder staircase examples are few both in steel and wood.

[0004] The reason is that when the upper floor side is a steel beam, a steel side girder staircase with simple fixing is selected. On the other hand, in the case of a spiral staircase made of steel, when the structural steel used for the main girder is bent into a spiral using a bending machine, the upper and lower flange surfaces rotate when the web is bent into a spiral, resulting in a twisted curved surface rather than a flat one. This makes it impossible to fix the horizontal underside of the treads, so it is not chosen. Furthermore, in the case of spiral staircases, wooden staircases, both stringer and support staircases, are difficult to process.

[0005] In the past, a well-known example of a spiral wooden box staircase from the mid-18th century is the "Spiral Staircase of St. Joseph in the Loretto Chapel in Santa Fe." This spiral staircase is constructed from a dense and strong joinery of a very hard type of wood. Risers and treads, which function as crossbeams, are attached to the top surface of the stringer-like support beams, and wooden planar materials are attached to the underside to cover the interior, resulting in a box girder cross section that "contains a mechanically superior grid structure of main beams and crossbeams." This grid structure increases the second moment of area in both the longitudinal and transverse directions and the bending rigidity, and by fixing it to the end surface of the upper floor, it realizes an elegant and rare spiral staircase with a height difference of approximately 7m and a coil shape of 720 degrees (2 turns). However, the structural components and assembly methods, which involve intricate and robust joinery of wood, that make it possible to create such mechanically superior spiral box-stringer staircases, as well as the craftsmen who perform this work, are not obsolete today.

[0006] In modern times, structures that possess a mechanically superior "internal grid structure of main girders and transverse girders" are known in the field of girder bridges, rather than girder-structured stairs, such as "steel box girder bridges" consisting of two rows of longitudinal box girders and multiple rows of transverse girders, and "steel bridges" consisting of multiple rows of longitudinal girders and multiple rows of transverse girders. However, this lattice structure is difficult to implement in girder-type staircases, whether straight or spiral. One reason for this is that, regardless of whether it is a straight or spiral staircase, in the case of a stringer structure, the presence of risers and treads causes the main stringer to be in the shape of a stringer and inclined in the direction of the staircase axis, making it difficult to attach the horizontal stringers that form the stair treads to the main stringer. The second reason is that, in the case of a spiral girder staircase, when the structural steel used for the main girder is bent into a spiral using a bending machine, bending the web into a spiral causes the upper and lower flange surfaces to rotate, resulting in a twisted curved surface, which prevents the horizontal underside of the crossbeam from being fixed in place. For the two reasons stated above, the lattice structure in question cannot be easily manufactured in a girder-type staircase, regardless of whether it is straight or spiral.

[0007] Therefore, girder-structured stairs, whether straight or spiral, often consist of simple steel stringer stairs. To increase the second moment of area and bending stiffness in the stair axial direction of this structure, the thickness and width of the steel plates (stringers) should be increased. However, increasing the thickness is limited by the specifications of the steel plates, and increasing the width leads to torsional buckling, as well as increased costs in transportation and assembly. As a result, the bending stiffness of girder-structured stairs cannot be easily increased. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2024-070376

[0009] The spiral girder structure of the staircase described in Patent Document 1 is composed of tread members and spiral plate members. After the tread members are installed spirally using temporary support members, two rows of spiral plate members are bolted up to the tread members. This provides a component and assembly method for a spiral girder staircase that incorporates a mechanically superior "grid structure of main girders and transverse girders" (see Figure 30 in Patent Document 1). However, even with the technology of Patent Document 1, problems remained unresolved, such as the instability of the accuracy and quality of "spirally bending" the steel plates (side girders) and the high cost of transporting and assembling "long spiral components".

[0010] The present invention provides a prefabricated staircase with a stringer structure that is easy to process, transport, and assemble, has excellent deformation reduction, and offers high design expandability and a stylish appearance, as well as a method for assembling such a staircase. However, the present invention does not include staircases that are not stringer structures, such as "steps made of brick or marble" and "spiral staircases in which the inner edges of the treads are attached to the outer circumference of the support columns." [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] The above has described the classification and advantages and disadvantages of conventional straight and spiral girder staircases. Based on this, the problems related to girder staircases that the present invention aims to solve are summarized in the following 1) to 8).

[0012] 1) Traditionally, commercial building structures have included steel frame structures and reinforced concrete (RC) structures. In such steel frame structures, staircase structures often consist of steel stringer staircases, which simplify the fixing of the steel beams to the web at the upper floor. However, since these fixing points are limited to two locations at both ends of the stringer, the problem of reduced durability due to stress concentration is unavoidable. In particular, in the case of spiral staircases, the large torsional moment generated at these fixing points can sometimes lead to failure. To fundamentally solve the vulnerability of the upper floor fixing points, there seems to be no optimal construction method other than RC structures, which are more expensive and require longer construction periods.

[0013] 2) Traditionally, residential building structures have included steel frame structures, PCaRC wall and floor structures, cast-in-place RC structures, and wooden structures. However, due to the problem of reduced durability of the fixed parts on the upper floor side, these staircase structures were often made of wood or steel, such as L-shaped staircases or spiral staircases, which were not stringer structures and could be integrated into the interior wall to share the load and save space. For this reason, it is difficult to adopt stringer staircases that would look good in the living room. In particular, it is difficult to adopt elegant spiral stringer staircases, and the degree of design freedom is low.

[0014] 3) Generally, structures that "inherently incorporate a grid structure of main girders and transverse girders," regardless of whether they are straight or spiral, are mechanically superior. However, in the case of a girder-structured staircase, the main girders are stringer-like and inclined in the direction of the staircase axis, making it difficult to attach the transverse girders, which form the stair treads, to the main girders, thus making it difficult to realize the grid structure.

[0015] 4) As a structure similar to the structure that "inherently incorporates a grid structure of main girders and transverse girders," although it is not a box girder staircase, there is a cast-in-place RC structure staircase in which the main and transverse reinforcing bars are arranged in a grid-like double reinforcement. It is seen in commercial buildings and, in addition to durability, has excellent fire resistance and sound insulation. However, its construction involves many man-hours and construction time, resulting in a complicated and expensive design.

[0016] 5) When bending the structural steel that will form the main stringer of a spiral staircase into a spiral using a bending machine, the upper and lower flange surfaces rotate as the web is bent spirally, resulting in a twisted curved surface. As a result, the underside of the treads cannot be fixed to the flange surface of the main stringer. Therefore, despite the excellent durability and stylish appearance of spiral steel stringer staircases, the optimal components and assembly method have not yet been found.

[0017] 6) The majority of spiral girder staircases are simple steel stringer staircases. To increase the second moment of area and bending stiffness in the staircase axial direction of such a structure, the thickness and width of the steel plates that form the stringers can be increased. However, increasing the thickness is limited by the specifications of the steel plates, and increasing the width leads to the manifestation of torsional buckling and increased costs. For this reason, a spiral girder staircase structure that can freely increase the second moment of area and bending stiffness has not yet been found.

[0018] 7) Most examples of spiral stringer staircases are simple steel stringer staircases. However, the following problems remain unresolved in the steel plates of the stringers, which are the "long members that form a spiral" in these staircases. 7)-1. The precision and quality of the "spiral bending process" are not stable. 7)-2. Long, spiral-shaped members are costly to transport and assemble, and shortening them and connecting them creates structural weaknesses. 7) - 3. The fixing parts of the "long member with a spiral shape" to the steel frame beams on the upper floor, which are limited to two places at both edges of the side girders, had their durability reduced due to the large torsional moment generated here.

[0019] 8) In the past, as an example of a wooden box girder staircase with a spiral, the "Spiral Staircase of Saint Joseph in the Loreto Chapel of Santa Fe" from the mid - 18th century is known. The structure forms a box girder cross - section by incorporating a "grid structure of main girders and cross - girders" where the second moment of area and bending rigidity increase in the longitudinal and transverse directions. As a result, a graceful and rare spiral box girder staircase in a coil shape of about 720 degrees (two turns) with a height difference of about 7 m is realized. However, the component members and assembly methods consisting of tightly and strongly joined wooden joinery work of wood, which can realize such a spiral box girder staircase incorporating a "grid structure of main girders and cross - girders" that is excellent mechanically, and the craftsmen who undertake this are now obsolete and cannot be realized.

Means for Solving the Problem

[0020] In order to solve the above problems, the prefabricated staircase according to the present invention comprises at least a horizontal main girder member made of a section - steel - like member, a cross - member made of a section - steel - like member or a steel - plate - like member, and an inclined member made of a rod - shaped inclined member or a planar inclined member, and is composed of Two or more rows of the horizontal main girder members have treads on the upper flange side of the horizontal main girder members. With the girder direction of the horizontal main girder members being horizontal and in the staircase axis direction, the adjacent flanges above and below are offset by the dimension of the tread and fixed in order, and the risers and treads are arranged alternately in a staircase shape. A plurality of the cross - members are fixed horizontally and transversely to two or more rows of the horizontal main girder members. The inclined member is fixed to a plurality of the cross - members or two or more rows of the horizontal main girder members, inclined in the staircase axis direction. A prefabricated staircase is provided, which is characterized by this.

[0021] In addition, in order to solve the above problems, as an assembly method of the prefabricated staircase according to the present invention The first step involves fixing at least two rows of starting horizontal main beam members to the end face of the upper or lower floor, A second step involves arranging and fixing two or more rows of new horizontal main girders, multiple transverse members, and inclined members in a stepped manner to two or more rows of the starting horizontal main girders, A third step is to pour concrete integrally with the inclined member and the two or more rows of horizontal main beams that form the starting point in any narrow space, thereby forming an RC connection, and then connect and fix the assembled stairs to the end face of the upper or lower floor. The present invention provides a method for assembling prefabricated stairs, characterized by having the following features. [Effects of the Invention]

[0022] The first means of the present invention, the assembled staircase, can achieve the following effects 1) to 3).

[0023] 1) The horizontal main girders 10 are preferably structural members such as channel steel, I-beams, or H-beams, given the required rigidity (see Figure 3). The horizontal main girders 10 have a tread 53 on their upper flange side and a riser 54 at one end of their web. In two or more rows, with the girder direction horizontal and oriented in the stair axis direction, adjacent flanges vertically are offset by the dimension of the tread 53 and fixed in sequence, with the risers 54 and treads 53 alternating in a staircase-like pattern, and assembled to the main girder 55 by bolting (see Figures 11 and 12). This produces the following effects.

[0024] 1)-1. The horizontal main beam member 10 can be designed to have its length extended horizontally (see Figure 34). This allows for flexible enhancement of the bending rigidity in the stair axial direction.

[0025] 1)-2. The horizontal main girders 10 can be designed to have an increased number of rows. This increases the number of fastening points between the upper floor 77 and the horizontal main girders (for the upper floor) 11, thereby mitigating stress concentration (see Figure 18).

[0026] 1)-3. The horizontal main girders 10 and 11 can have their number of rows changed in the design. This allows for adaptation to various structural forms, such as "when two rows form a load girder 56" or even "when multiple rows form a box girder 57" (see Figures 30 and 33, and Figures 14 and 19).

[0027] 1)-4. The horizontal main beam member 10 is cut horizontally. This provides the following effect. 1)-4-1. The horizontal main beam members (for the upper floor) 11 and the horizontal main beam members (for the lower floor) 12 are joined to the upper floor 77 and the lower floor 78, and then the horizontal main beam members (for the intermediate floor) 13 are stacked sequentially in a staircase-like manner in the narrow space between them, and finally they can be fixed in place from the horizontal direction (see Figures 11 and 28). As a result, each member is tightly fixed together as a whole, and a highly rigid prefabricated staircase with minimal shaking can be assembled.

[0028] 1)-4-2. Each layer is assembled in a stepped manner by bolting it up from the top and bottom. Therefore, the horizontal position can be adjusted simply and with high precision by using the clearance for the bolts in the bolt holes 73, and the vertical position can be adjusted by inserting spacers (not shown) (see Figure 12).

[0029] 1)-4-3. The upper or side surfaces of the beams 50, 51 of the upper floor, or the end surface 85 or back surface of the PCaRC floor 83, are horizontal or vertical. Therefore, the horizontal main girders (for the upper floor) 11 can be firmly fixed in close contact with anchor bars 92 by aligning one of the flanges or webs directly with one of the upper floor 77 (see Figures 18 and 32).

[0030] 1)-4-4. The horizontal main beam (for upper floor) 11 can be fixed horizontally along the wooden beam 52 by its outermost web (see Figure 37). Therefore, even in wooden houses with wooden beam and wooden floor structures, it is possible to realize stylish prefabricated stairs that combine straight lines and spirals. This will be explained later.

[0031] 1)-4-5. The horizontal main beam members 10 and the transverse members (risers) 21 fixed to their edges are both made of shaped steel members cut horizontally, and have excellent torsional rigidity. Therefore, they form a mechanically superior lattice structure 59 (see Figures 16 and 30).

[0032] 1)-4-6. Even in the case of a spiral, the horizontal main beam member 10 is processed as a simple curve (see Figures 22 and 23). Furthermore, there is no need for "bending into a spiral" or "transportation and assembly of long members exhibiting a spiral shape." As a result, regardless of whether it is a straight line or a spiral, it can be processed inexpensively, assembled simply and with high precision.

[0033] 2) The transverse members are horizontally cut and are either shaped steel members or steel plate members, and are fixed in the transverse direction to each of the horizontal main girders 10 that are arranged in a staircase pattern (see Figure 16). The transverse members 20 are, in order from the edge side of the staircase surface, "a transverse member (riser part) 21 made of shaped steel members that becomes the riser 54", "a transverse member (riser part) 22 made of steel plate members that becomes the tread", and "a transverse member (leading part) 23 made of steel plate members that is fixed to the non-tread position and has fixing joints 58 for inclined members (rod-shaped type) 41 on the front and rear sides in the direction of the staircase axis, and unitizes with the horizontal main girders 10 in advance". Furthermore, when assembling the intermediate section between the upper floor 77 and the lower floor 78 in advance, the preceding unit (for the intermediate section) 33 is made into a unit consisting of the horizontal main beam member (for the intermediate section) 13 and the transverse member (for the preceding section) 23 (see Figures 4 and 24, 7 and 27, and 41). This produces the following effects.

[0034] 2)-1. The transverse member (riser portion) 21, made of a shaped steel member, is positioned at the edge of the horizontal main girder member 10, and the transverse member (leading portion) 23 and the transverse member (riser portion) 22, made of a steel plate member, are positioned in the narrow space between the vertically adjacent horizontal main girder members 10 (see Figures 16, 17, and 31). This provides the following effects. 2)-1-1. Since the transverse members (risers) 21 are located at the edges of the horizontal main girders 10, they do not interfere with each other and form a mechanically superior grid structure 59, 60. This resolves the problem in conventional grid structures where "it is difficult to attach the transverse girders that form the steps to the main girders." (See Figures 12 and 16).

[0035] 2)-1-2. The transverse member (leading section) 23, which has fixing joints 58 on the front and rear sides in the direction of the stair axis, is to be fixed to the transverse member (leading section) 23, with two inclined sections (rod-shaped type) 41 in the direction of the stair axis (see Figures 13, 14, 29, and 30). In this way, in addition to the two-dimensional lattice structure 59 of the transverse member (riser section) 21 and the transverse member (leading section) 23 and the horizontal main beam member 10, a three-dimensional lattice structure 60 can be formed by the two inclined sections (rod-shaped type) 41 in the direction of the stair axis (see Figure 16). Thus, rigidity is effectively increased, and a slender and structurally rational prefabricated staircase is constructed.

[0036] 2)-1-3. The transverse member 20, which is made of a steel plate-like member, is configured to be separated into a transverse member (leading section) 23 and a transverse member (rising section) 22 (see Figure 16). This allows for the effective construction of both the "preliminary assembly of the transverse member (leading section) 23" and the "fixing of the two-tiered inclined members (rod-shaped type) 41" (see Figures 12, 14, and 16).

[0037] 2)-1-4. The transverse members (leading section) 23 and transverse members (riser section) 22, which are made of steel plate-like members, are used as templates to match a predetermined alignment, and the horizontal main girders 10 are positioned by bolting them up into the bolt holes 73 (see Figures 4 and 24, 7 and 27, 12 and 16). In this way, all members can be assembled to a predetermined alignment simply and with high precision using the transverse members (leading section) 23 and transverse members (riser section) 22 as templates.

[0038] 2)-1-5. Instead of using the transverse members (riser portion) 21 made of shaped steel members, only steel plate-like members that bend in stages may be used for the treads and risers in a staircase-like manner. In this case, the lattice structure is lost, but the configuration is simplified, and the construction period and cost are reduced (not shown).

[0039] 2)-2. In the transverse members (leading section) 23 and transverse members (rising section) 22, they become strip-shaped in the case of a straight line and fan-shaped flat plates in the case of a spiral, and can be freely processed to match the linear shape (see Figures 4 and 24). This provides the following effects. 2)-2-1. By processing the transverse members (leading section) 23 and transverse members (rising section) 22 according to the linear shape, they can be freely adapted to complex linear shapes such as straight lines, transitional lines, and helices (see Figure 31).

[0040] 2)-2-2. Similar to the horizontal main girder members 10, the transverse members 20 do not require "bending into a spiral" or "transportation and assembly of long members exhibiting a spiral shape" (see Figure 24). Therefore, regardless of whether they are straight or spiral, they can be processed inexpensively and assembled simply and accurately.

[0041] 2)-2-3. In the case of complex alignments such as straight lines, transitional lines, and spirals, the transverse members (leading sections) 23 that match the alignment and the horizontal main girders 10 that are processed to follow them are pre-unitized in the factory, transported to the site, and bolted together. This allows for easy assembly even with complex alignments (see Figures 7 and 27).

[0042] 3) The inclined members 40 include rod-shaped inclined members (rod-shaped type) 41, planar inclined members (planar type) 42, and planar inclined members (planar type for assembly) 43. For rod-shaped inclined members, "reinforcement bars or round steel" are preferable, and for planar inclined members, "steel plate-like members" are preferable (see Figures 14, 30, 16, and 38). The inclined members 40 are then fixed to multiple transverse members 20 or two or more rows of horizontal main beam members 10, at an angle in the direction of the stair axis. This produces the following effects.

[0043] 3)-1. The main girder, consisting of horizontal main beam members 10 with a horizontally cut shape, has structurally weak bending rigidity in the stair axis direction. Therefore, the inclined members (rod-shaped type) 41 or the inclined members (plane-shaped type) 42, 43 are fixed at the respective fixing joints 58 of the transverse members 20, or at the edge of the horizontal main beam member 10 opposite the stair surface, at an angle in the direction of the stair axis. This smoothly corrects the position of the transverse members 20 and the horizontal main beam member 10 integrated therewith, which are arranged in a staircase pattern, and also increases the bending rigidity in the direction of the stair axis (see Figures 14, 30, 16, and 38).

[0044] 3)-2. In the main girder, which consists of horizontal main girder members 10, the web and flange edges of the horizontal main girder members 10, which are made of structural steel members, are exposed on the opposite side of the stair surface, resulting in an unsightly appearance. Therefore, the inclined members (planar type) 42 are fixed transversely to the webs and flanges of the horizontal main beam members 10 of each row, with their edges fixed to each other, and are inclined in the direction of the stair axis, covering them (see Figure 16). This improves the aesthetic appearance on the opposite side of the stair surface and increases the bending rigidity in the direction of the stair axis.

[0045] 3)-3. The inclined members (rod-shaped type) 41 and the inclined members (plane-shaped type) 42 may be used individually or in combination. Using both together allows for smooth straightening of the transverse members 20 and the horizontal main beam members 10 integrated therewith, which are arranged in a staircase pattern, improving the aesthetics of the opposite side of the staircase surface and increasing the bending rigidity in the staircase axis direction (see Figure 16).

[0046] The second method of assembling the assembly stairs of the present invention proceeds through the following first to third steps. This makes it possible to achieve the effects shown in 4) to 6) below. The details of 4) to 6) are described in detail in "Assembly Methods of Examples 1 and 2".

[0047] 4) The following first step is performed. This will produce the following effects. • First step (see Figures 8, 9, 10, 18, and 32) Step 1: Secure the horizontal main beam members (for the upper floor) 11 and the horizontal main beam members (for the lower floor) 12.

[0048] 4)-1. The top or side surface of the beam 50 of the upper floor, or the end surface 85 or back surface of the PCaRC floor 83, is either horizontal or vertical. Therefore, the horizontal main girders (for the upper floor) 11 can be firmly fixed in close contact with anchor bars 92 by aligning one of the flanges or webs directly with either the upper floor 77 side.

[0049] 4)-2. Install anchor bars 92, fixing members (for anchor bars) 99, and horizontal main beam member holding members 87 on the upper floor 77 or lower floor 78 so that the horizontal main beam members (for upper floor) 11 and horizontal main beam members (for lower floor) 12 can be fixed to the upper floor 77 and lower floor 78. Then the horizontal main beam members (for upper floor) 11 and horizontal main beam members (for lower floor) 12 will be fixed to the upper floor 77 and lower floor 78.

[0050] 5) The following second step is carried out. This will produce the following effects. • Second step (See Figures 11, 12, 13, 14, 15, 16, 28, 29, 30, and 7, 27) Step 2: Pre-assembly of horizontal main beam members (for intermediate use) 13 and transverse members (for leading section) 23. Step 3: Secure the inclined members (rod-shaped type) 41 in two stages, front and back. Step 4: Fixing the transverse members (riser section) 21, transverse members (riser section) 22, and inclined members (surface type) 42.

[0051] 5)-1. The horizontal main beam members (for the upper floor) 11 and the horizontal main beam members (for the lower floor) 12 are joined to the upper floor 77 and the lower floor 78, and then the horizontal main beam members (for the intermediate section) 13 are stacked in the narrow space between them, and finally they can be fixed in place from the horizontal direction. As a result, each member is tightly fixed together as a whole, and a highly rigid prefabricated staircase with minimal shaking can be assembled.

[0052] 5)-2. The transverse member (leading section) 23, which has fixing joints 58 on the front and rear sides in the direction of the stair axis, is to be fixed to the transverse member (leading section) 23, with two inclined sections (rod-shaped type) 41 at an angle in the direction of the stair axis. In this way, in addition to the two-dimensional lattice structure 59 of the transverse member (riser section) 21, the horizontal main beam 10, and the transverse member (leading section) 23, a three-dimensional lattice structure 60 can be formed by the two inclined sections (rod-shaped type) 41. Thus, rigidity is effectively increased, and a slender and structurally rational prefabricated staircase is constructed.

[0053] 5)-3. The transverse member 20, which is made of a steel plate-like member, is configured to be separated into a transverse member (leading section) 23 and a transverse member (rising section) 22. This makes it possible to effectively carry out both the "preliminary assembly of the transverse member (leading section) 23" and the "fixing of the two-tiered inclined members (rod-shaped type) 41."

[0054] 5)-4. The inclined members (rod-shaped type) 41 and the inclined members (surface-shaped type) 42 may be used individually or in combination. Using both together allows for smooth straightening of the transverse members 20 and the horizontal main beam members 10 integrated therewith, which are arranged in a staircase pattern, improving the aesthetic appearance on the opposite side of the staircase surface and increasing the bending rigidity in the staircase axis direction.

[0055] 6) The following third step is performed. This will produce the following effects. • Third step (see Figures 17, 18, 19, and 31, 32, 33) Step 5: Concrete pouring for RC connector 61. Step 6: Finished.

[0056] 6)-1. The main beam 55, consisting of horizontal main beam members 10, can be securely fixed to the upper floor 77 side via the RC connector 61, and the majority of the total weight of the assembled staircase is held by the upper floor 77 side. As a result, this design essentially solves the problem in conventional stringer staircases where the fixing points on the upper floor side are limited to two locations at both ends of the stringer, which reduces durability. In particular, in the case of spiral staircases, it can easily withstand the large torsional moment at the fixing point on the upper floor side 77.

[0057] 6)-2. Concrete is poured between the RC connecting body 61 at the junction of the upper floor 77 and the lower floor 78 to form a continuous RC body 103. This increases the rigidity of the assembled staircase in a continuous manner and minimizes swaying during ascent and descent. [Brief explanation of the drawing]

[0058] [Figure 1] Figure 1 shows a side view, a top view, and a cross-sectional view of the horizontal main beam member (for the upper floor) of Example 1. [Figure 2] Figure 2 shows a side view, a top view, and a cross-sectional view of the horizontal main beam member (for the lower floor) of Example 1. [Figure 3] Figure 3 shows a side view, a top view, and a cross-sectional view of the horizontal main beam member (for intermediate use) of Example 1. [Figure 4] Figure 4 shows, in order, a cross-sectional view and a plan view of the transverse member that forms the riser, the transverse member that forms the tread, and the transverse member having a joint for fixing the inclined member, according to Example 1. [Figure 5] Figure 5 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 1. [Figure 6] Figure 6 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the lower floor) of Example 1. [Figure 7] Figure 7 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for intermediate use) of Example 1. [Figure 8] Figure 8 shows a plan view and a side view of step 1 of Example 1, with a cross-sectional view shown in section a. [Figure 9] Figure 9 shows a magnified view of the assembly status of the preliminary unit (for the upper floor) in Step 1 of Example 1. [Figure 10] Figure 10 shows a magnified view of the assembly status of the preliminary unit (for the lower floor) in Step 1 of Example 1. [Figure 11] Figure 11 shows a plan view and a side view of step 2 of Example 1, with a cross-sectional view shown in section c. [Figure 12] Figure 12 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 11. [Figure 13]Figure 13 shows a plan view and a side view of step 3 of Example 1, with a cross-sectional view shown in section c. [Figure 14] Figure 14 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 13. [Figure 15] Figure 15 shows a plan view and a side view of step 4 of Example 1, with a cross-sectional view shown in section c. [Figure 16] Figure 16 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 15. [Figure 17] Figure 17 shows a plan view and a side view of step 5 of Example 1, with a cross-sectional view shown in section c. [Figure 18] Figure 18 shows the joint configuration when the upper floor side is a steel beam / deck floor structure, and is an enlarged view of parts d and e in Figure 17, which is the assembly status in step 5 of Example 1. [Figure 19] Figure 19 shows a plan view and a side view of step 6 of Example 1, with a cross-sectional view shown in section c. [Figure 20] Figure 20 shows a side view, a top view, and a cross-sectional view of the horizontal main beam member (for the upper floor) of Example 2. [Figure 21] Figure 21 shows a side view, a top view, and a cross-sectional view of the horizontal main beam member (for the lower floor) of Example 2. [Figure 22] Figure 22 shows the side view, plan view, and cross-sectional view of the horizontal main girder (intermediate) on the outside of Example 2, with the A-A' section showing the side view of the horizontal main girder on the outside with a spiral line. [Figure 23] Figure 23 shows the side view, plan view, and cross-sectional view of the horizontal main girder (intermediate) on the inside of Example 2, with the A-A' section showing the side view of the inside of the horizontal main girder with a spiral line. [Figure 24] Figure 24 shows, in order, a cross-sectional view and a plan view of the cross member having a joint for fixing the riser, the tread, and the inclined member, respectively, in Example 2. [Figure 25] Figure 25 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 2. [Figure 26] Figure 26 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the lower floor) of Example 2. [Figure 27]Figure 27 shows the side view, top view, and cross-sectional view of the preliminary unit (intermediate) of Example 2, with the A1-A1' and A2-A2' cross sections showing the outer and inner side views of the horizontal main beam members of the spiral line, respectively. [Figure 28] Figure 28 shows a plan view and a side view of step 2 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-shaped assembly staircase shown in the Q-Q' section. [Figure 29] Figure 29 shows a plan view and a side view of step 3 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-shaped assembly staircase shown in the Q-Q' section. [Figure 30] Figure 30 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 29. [Figure 31] Figure 31 shows a plan view and a side view of step 5 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-shaped assembly staircase shown in the Q-Q' section. [Figure 32] Figure 32 shows the joint configuration when the upper floor is a PCaRC floor structure, and is an enlarged view of parts d and e in Figure 31, which is the assembly status in step 5 of Example 2. [Figure 33] Figure 33 shows a plan view and a side view of step 6 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-shaped assembly staircase shown in the Q-Q' section. [Figure 34] Figure 34 is a reference diagram showing an enlarged view of the portion corresponding to section d in Figure 17, when the horizontal main girder is extended to increase the girder rigidity. [Figure 35] Figure 35 is a diagram of Reference Example 1 showing the connection configuration when the upper floor side has a steel beam and wooden floor structure. [Figure 36] Figure 36 is a reference example 2 showing the connection configuration when the upper floor side is a PCaRC wall / floor structure. [Figure 37] Figure 37 is a diagram of Reference Example 3, showing the joint configuration when the upper floor side has a wooden beam and wooden floor structure. [Figure 38] Figure 38 is a reference diagram showing an enlarged view of the assembly situation corresponding to parts b and c in Figure 13, in the case where the inclined member is a steel plate-like member with a fixed joint that is assembled to the transverse member. [Figure 39] Figure 39 shows a side view, top view, and cross-sectional view of a preliminary unit (for intermediate use) when the inclined member is a steel plate-like member equipped with a fixing joint as shown in Figure 38 and assembled to a transverse member. [Figure 40] Figure 40 is a hierarchical diagram showing the types of horizontal main beam members of the present invention. [Figure 41] Figure 41 is a hierarchical diagram showing the types of cross-sectional materials of the present invention. [Figure 42] Figure 42 is a hierarchical diagram showing the types of inclined materials of the present invention. [Figure 43] Figure 43 is a hierarchical diagram showing the types of prior art units of the present invention. [Figure 44] Figure 44 is a table showing the specifications of the constituent members for Example 1 and Example 2. [Modes for carrying out the invention]

[0059] As embodiments for carrying out the present invention, the forms of the constituent members of the prefabricated staircase of the present invention, namely A. horizontal main beam, B. transverse member, and C. inclined member, will be described. Next, we will explain the "connection methods of the horizontal main girders (for upper floors) 11" for each of the structural types of the upper floor on the building side: D. Steel beam / deck floor structure or steel beam / wooden floor structure, E. PCaRC floor structure or PCaRC wall / floor structure, and F. Wooden beam / wooden floor structure. Next, preferred embodiments 1 and 2 of the present invention will be described in order to G, H, I, J and K, L, M, N respectively, with respect to "staircase structure and alignment," "standards of constituent members," "structure of the preceding unit," and "assembly method."

[0060] As embodiments for carrying out the present invention, the forms of the components of the prefabricated staircase of the present invention, namely A. horizontal main beam, B. transverse member, and C. inclined member, are described below. In this invention, the terms structural steel, structural steel-like member, steel plate-like member, and flange are used according to the definitions shown below. Structural steel refers to a general term for steel materials with a specific cross-section, and specifically refers to structural steel with flanges, such as channel steel, I-beams, H-beams, and square steel pipes. The structural steel members and steel plate members may be made of any material, such as iron or resin. A flange refers to a plate-like portion used to secure itself to another component.

[0061] A. Horizontal main girder material 10 A-1. These are shaped steel members cut horizontally. Depending on the stair section, there are horizontal main beam members (for upper floor) 11, horizontal main beam members (for lower floor) 12, and horizontal main beam members (for intermediate floor) 13 (see Figures 1, 2, 3, and 40).

[0062] A-2. The transverse member (leading section) 23 is unitized to form the leading unit (for upper floor) 31, leading unit (for lower floor) 32, and leading unit (for intermediate section) 33, which are assembled in advance prior to the fixing of the inclined member 40 (see Figures 5, 6, 7, and 43). In addition, a gripping section (riser section) 80 is provided to grip and fix the transverse member (riser section) 21 (see Figures 1, 2, and 3).

[0063] A-3. The main beam 55 has a tread surface 53 on the upper flange side and a riser 54 at one end of the web, arranged in multiple rows in a staircase-like manner (see Figures 3, 11, 22, 23, and 28).

[0064] A-4. For straight alignments, a straight material is used (see Figure 3), while for helical alignments, a "horizontal, non-helical bending process" is performed, where the flange surface remains horizontal and exhibits a simple curve (see Figures 22 and 23).

[0065] A-5. In the case of channel steel, it forms a single row of girders, either individually or back-to-back. In the case of I-beams (not shown), it forms a single row of girders. Then, two rows form a force girder 56 (see Figure 33), or multiple rows form a box girder 57 (see Figure 19).

[0066] A-6. In terms of girder height, having two risers 54 on one side of the web improves overall processing and assembly efficiency (see Figures 1, 2, 3, and 20, 21, 22, and 23). Also, in terms of the total height of the stairs, a component with one riser 54 on one side of the web may be necessary for dimensional adjustment (not shown).

[0067] B. Cross section 20 B-1. It is a horizontally cut shape and is a shaped steel member or a steel plate member. In the horizontal main beam member 10 to which it is fixed, in order from the edge side of the stair surface, there is a "transverse member (riser part) 21 which is a shaped steel member and becomes the riser 54", a "transverse member (riser part) 22 which is a steel plate member and becomes the tread 53", and a "transverse member (leading part) 23 which is a steel plate member that is fixed in the non-tread position and has fixing joints 58 for inclined members (rod-shaped type) 41 on the front and rear sides in the direction of the stair axis, and unitizes with the horizontal main beam member 10 in advance" (see Figures 4 and 24, 7 and 27, and 41).

[0068] B-2. After assembling a preliminary unit (see Figures 5, 6, 7, and 25, 26, 27, and 43) in a staircase shape, which consists of a horizontal main beam 10 and a transverse member (preceding section) 23 equipped with a fixing joint 58 for an inclined member (rod-shaped type) 41, the front and rear two-tiered inclined members (rod-shaped type) 41 and transverse members (riser section) 22 and transverse members (riser section) 21 are assembled (see Figures 14 and 16).

[0069] B-3. ​​The transverse member (riser) 21 can be a straight member, regardless of whether it is straight or spiral. On the other hand, the transverse member (leading part) 23, which has a fixing joint 58 for the transverse member (riser) 22 and the inclined member (rod-shaped type) 41, will be strip-shaped if it is straight and fan-shaped if it is spiral (see Figures 4 and 24).

[0070] C. Inclined material 40 C-1. There are rod-shaped inclined members (rod-shaped type) 41, planar inclined members (planar type) 42, and planar inclined members (planar type for assembly) 43. (See Figures 14, 16, 30, 38, and 42).

[0071] C-2. The inclined member (rod-shaped type) 41 is preferably made of reinforcing bar or round steel, and is assembled to the transverse member (leading section) 23 which has a fixing joint 58 for the inclined member (rod-shaped type) 41 (see Figures 14 and 30, 7 and 27).

[0072] C-3. The inclined members (rod-shaped type) 41 are transported to the site as straight pieces that do not hinder portability. In the case of a spiral, after being transported to the site, they are bent into a simple curve using a bending machine and then fixed to the fixing joints 58 of the stepped transverse members (leading sections) 23 to form a spiral. If necessary, they may also be joined by overlapping using a lap joint method (see Figure 30). This eliminates the need for "bending into a spiral" and the transportation and assembly of "long spiral members," making it inexpensive to process and allowing for simple and accurate assembly into a spiral.

[0073] C-4. The "planar inclined member" consists of "an inclined member (planar type) 42 fixed to the edge of the horizontal main beam member 10 on the opposite side of the stair surface" and "an inclined member (planar type for assembly) 43 equipped with a fixing joint 58 and fixed in combination with the transverse member (leading part) 23" (see Figures 16, 38 and 39).

[0074] C-5. The inclined member (surface type) 42, which is fixed to the opposite side of the stair surface, can be easily fitted and fixed by being "a strip with the longitudinal side in the direction of the stair axis" in the case of a straight alignment, and "a strip with the transverse side in the direction of the cross" in the case of a spiral alignment (not shown).

[0075] C-6. The inclined member (planar type for assembly) 43, which is assembled by being incorporated into the transverse member (leading section) 23 equipped with a fixing joint 58, shall be in the shape of a strip with the stair axis direction as its length, regardless of whether the linear or spiral shape is straight or spiral, and shall be equipped with a fixing joint 58 that is incorporated into the fixing joint 58 on the transverse member (leading section) 23 side (see Figures 38 and 39). If necessary, thin members may be made in multiple layers. In this case, there is no need for "bending into a spiral" or "transportation and assembly of long members exhibiting a spiral," so it can be processed inexpensively and assembled into a spiral in a simple and accurate manner.

[0076] The forms of A. horizontal main beams, B. transverse members, and C. inclined members, which are the constituent members of the prefabricated staircase of the present invention, have been described above. Consequently, in the case of a spiral configuration, the components of the assembled staircase of the present invention do not require "bending into a spiral" or "transportation and assembly of long, spiral-shaped components," making them inexpensive to manufacture and allowing for simple, precise, and efficient assembly into a spiral.

[0077] Next, we will explain the "connection methods for the horizontal main beam members (for the upper floor) 11" for the following structural types of the upper floor on the building side: D, E, and F. D. Steel beam and deck floor structure (Example 1) or steel beam and wooden floor structure (Reference Example 1) E. PCaRC floor structure (Example 2) or PCaRC wall and floor structure (Reference Example 2) F. Wooden beam / wooden floor structure (reference example 3)

[0078] D. Steel beam and deck floor structure or steel beam and wooden floor structure Each of the figures to be referenced will be explained. (Example 1: Steel beam and deck floor structure) Figure 5 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 1. Figure 9 shows a magnified view of the assembly status of the preliminary unit (for the upper floor) in Step 1 of Example 1. Figure 18 shows the joint configuration when the upper floor side is a steel beam / deck floor structure, and is an enlarged view of parts d and e in Figure 17, which is the assembly status in step 5 of Example 1. (Example 1: Steel beam and wooden floor structure) Figure 35 is a reference example 1 showing the connection configuration when the upper floor side has a steel beam and wooden floor structure.

[0079] D-1. In the steel-framed upper floor 77, the horizontal main beam member (for the upper floor) 11, which is the starting end on the upper floor side, is positioned perpendicular to the steel beam 51 on the upper floor side in a plan view.

[0080] D-2. In order to hold the lead unit (for upper floor) 31 to the steel beam 51, the horizontal main girder retaining member 87 is pre-fixed to the web side of the steel beam 51 in the transverse direction with bolts and nuts 72 at the intersection of the web of the steel beam 51 and the lower flange of the horizontal main girder members (for upper floor) 11 that are arranged transversely.

[0081] D-3. With only the horizontal main girder support member 87, the leading unit (for upper floor) 31 will rotate and fall off as a whole. Therefore, the transverse member (riser) 21, which is fixed to the horizontal main girder member (for upper floor) 11 in advance, and the web or upper flange of the steel beam 51 are fixed with anchor reinforcement (for transverse member (riser)) 94.

[0082] D-4. In step 5 of Embodiment 1, described later, anchor reinforcement bars (for RC connectors) 95 are installed on the web surface of the steel beam 51, which forms the end faces 85 of the upper floor 77 and lower floor 78, and on the upper surface of the lower floor 78, so as to be fixed to the RC connector 61. Furthermore, anchor reinforcement (for RC connectors) 95 can be used interchangeably with anchor reinforcement (for transverse members (riser section)) 94.

[0083] E. PCaRC floor structure or PCaRC wall and floor structure The figures in Example 2 and Reference Example 2, which are referenced, will be explained below. (Example 2) Figure 25 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 2. Figure 32 shows the joint configuration when the upper floor is a PCaRC floor structure, and is an enlarged view of parts d and e in Figure 31, which is the assembly status in step 5 of Example 2. (Reference example 2) Figure 36 is a reference example 2 showing the connection configuration when the upper floor side is a PCaRC wall / floor structure.

[0084] E-1. In the upper floor of a PCaRC floor structure, the horizontal main beam member (for upper floor) 11, which is the starting end on the upper floor side, is positioned perpendicular to the end face 85 on the PCaRC floor 83 side of the upper floor in a plan view.

[0085] E-2. The webs or lower flanges of the horizontal main girders (for the upper floor) 11, which are arranged transversely, are fixed to either surface of the PCaRC floor 83 using anchor bars (for the horizontal main girder support members) 93, which are provided in advance on the PCaRC floor 83 side, via the horizontal main girder support members 87.

[0086] E-2-1. In the case of a PCaRC floor structure, an L-shaped cutout 88 is provided on the side of the horizontal main beam member 10 opposite the stair surface, where the upper flange and web are cut out in an L-shape. A horizontal main beam member retaining member 87, made of a shaped steel member, is placed longitudinally along the web at the upper end of the L-shaped cutout 88. The horizontal main beam member retaining member 87 is then fixed to the back surface of the PCaRC floor 83 with anchor bars (for horizontal main beam member retaining member) 93 that have been pre-installed on the PCaRC floor 83 side.

[0087] E-2-2. In the case of a PCaRC wall / floor structure, a horizontal main girder member retainer 87, which is made of a shaped steel member and is arranged transversely so as to be supported by the lower flange surface, is fixed to the PCaRC wall 84 with pre-installed anchor bars (for horizontal main girder member retainer) 93.

[0088] E-3. With only the horizontal main beam support member 87, the preceding unit (for upper floor) 31 will rotate and fall off as a whole. Therefore, the transverse member (riser portion) 21, which is fixed to the horizontal main beam member (for upper floor) 11 in advance, and the end face 85 on the PCaRC floor 83 side are fixed with pre-installed anchor bars (for transverse member (riser portion)) 94.

[0089] E-4. In step 5 of Example 2 described later, anchor bars (for RC connectors) 95 are installed on the end faces 85 of the upper floor 77 and lower floor 78 so as to be fixed to the RC connector 61. Furthermore, anchor reinforcement (for RC connectors) 95 can be used interchangeably with anchor reinforcement (for transverse members (riser sections)) 94 and anchor reinforcement (for horizontal main beam member support members) 93.

[0090] F. Wooden beam / wooden floor structure I will now explain the diagram in Reference Example 3, which is to be referenced. (Reference example 3) Figure 37 is a reference example 3 showing the connection configuration when the upper floor side has a wooden beam / wooden floor structure.

[0091] F-1. In the wooden upper floor 77, the horizontal main beam member (for upper floor) 11, which is the starting end on the upper floor side, is arranged parallel and horizontally to the narrow space between the two rows of wooden beams 52 of the upper floor, which are on the left and right sides in a plan view. Note that, unlike the steel beams 51, the wooden beams 52 cannot be arranged perpendicularly due to their strength characteristics.

[0092] F-2. An L-shaped cutout 88 is provided on the side of the horizontal main beam member (for upper floor) 11 opposite to the stair surface, where the upper flange and web are cut out in an L-shape. An L-shaped cutout cross member 89, consisting of multiple rows of shaped steel members, is arranged transversely at the upper end of the L-shaped cutout 88. In addition, at the lower corner of the side of the wooden beam 52 that is horizontally opposite to the row of horizontal main beam members (for upper floor) 11, an opposite surface member 90, which has a right-angled interior angle surface formed by the integration of two shaped steel members perpendicularly, is arranged longitudinally in such a manner that the right-angled interior angle surface encloses the lower corner.

[0093] F-2-1. The edge of the L-shaped defect section cross member 89 and the opposite face member 90 are vertically sandwiched between the wooden beam 52 and secured vertically with bolts and nuts 72.

[0094] F-2-2. The lower ends of the horizontal main beam members (for upper floor) 11 at the left and right edges and the opposite face members 90 are horizontally sandwiched between the wooden beams 52 and secured horizontally with bolts and nuts 72.

[0095] The above explains the "connection methods for horizontal main girders (for upper floors) 11" for the structural types of the upper floor on the building side: "D. Steel beam / deck floor structure or steel beam / wooden floor structure", "E. PCaRC floor structure or PCaRC wall / floor structure", and "F. Wooden beam / wooden floor structure". This increases the number of fastening points between the upper floor and the horizontal main beam member (for upper floor) 11 in various types of upper floor structures on the building side, thereby mitigating stress concentration.

[0096] Next, preferred embodiments of the present invention will be described in order for Example 1 and Example 2, with respect to "staircase structure and alignment," "standards of constituent members," "structure of the preceding unit 30," and "assembly method," as G, H, I, J and K, L, M, N respectively. [Examples]

[0097] Regarding Example 1, the following will explain, in order, the "staircase structure and alignment," "standards of constituent members," "structure of the preceding unit," and "assembly method."

[0098] G. Staircase structure and linearity (Example 1) The following explains each of the figures to be referenced. Figure 7 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for intermediate use) of Example 1. Figure 17 shows a plan view and a side view of step 5 of Example 1, with a cross-sectional view shown in section c. Figure 18 shows the joint configuration when the upper floor side is a steel beam / deck floor structure, and is an enlarged view of parts d and e in Figure 17, which is the assembly status in step 5 of Example 1. Figure 19 shows a plan view and a side view of step 6 of Example 1, with a cross-sectional view shown in section c.

[0099] This explains the staircase structure and its linearity. The structure of the upper floor 77 is a steel beam and deck floor structure. The staircase structure is a box-stringer staircase consisting of four rows of main stringers. Each main girder consists of two horizontal main girder members 10 made of light channel steel, which are bolted back-to-back. A linear line is a straight line.

[0100] H. Specifications of constituent materials (Example 1) The following explains each of the figures to be referenced. Figure 44 is a table showing the specifications of the constituent members for Example 1 and Example 2. Figure 1 shows a side view, a top view, and a cross-sectional view of the horizontal main beam member (for the upper floor) of Example 1. Figure 2 shows the side view, top view, and cross-sectional view of the horizontal main beam member (for the lower floor) of Example 1. Figure 3 shows the side view, top view, and cross-sectional view of the horizontal main beam member (for intermediate use) of Example 1. Figure 4 shows, in order, a cross-sectional view and a plan view of the transverse member (riser), transverse member (tread), and transverse member (leading section) having a joint for fixing the inclined member, respectively, in Example 1. Figure 14 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 13. Figure 16 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 15.

[0101] The specifications for the constituent components are described. The material used for the horizontal main beam members 10 is light channel steel 62. The material used for the transverse members (riser section) 21 is welded lightweight H-beams. The material used for the transverse members (riser portion) 22 and the transverse members (leading portion) 23 is rolled steel plate. The height of the cross-section member (riser section) 21 shall be the same as the riser dimension. The width of the transverse member (riser) 22 shall be the same as the tread dimension. The height of the horizontal main beam member 10 shall be twice the height of the transverse member (riser portion) 21, and the transverse member (leading portion) 23 shall be twice the thickness of the transverse member (riser portion) 22. The material used for the inclined material (surface type) 42 is rolled steel plate. The material used for the inclined member (rod-shaped type) 41 is reinforced concrete steel bars.

[0102] I. Structure of the lead unit 30 (Example 1) Each horizontal main beam member 10 is unitized with the transverse members 20 to form a preliminary unit (for upper floor) 31, a preliminary unit (for lower floor) 32, and a preliminary unit (for intermediate floor) 33, which are assembled in advance prior to the fixing of the two-tiered inclined members (rod-shaped type) 41. The following explains each of the figures to be referenced. Figure 5 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 1. Figure 6 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the lower floor) of Example 1. Figure 7 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for intermediate use) of Example 1. Figure 43 is a hierarchical diagram showing the types of the prior art units of the present invention.

[0103] The structure of the preceding unit 30 is described below. The main girder is constructed by fixing two horizontal main girder members 10, made of light channel steel 62, back to back with bolts and nuts 72. The main girders 55, consisting of horizontal main girders 10, are arranged transversely, and the transverse members (leading sections) 23 are initially integrated with the upper flanges using temporary bolts 71, with the bolts protruding upwards. The transverse members (leading sections) 23 are fixed to the top and bottom, and the structure is assembled in a stepped manner, while the temporary bolts 71 are rearranged so that the bolts protrude downwards (not shown). Bolt holes 73 are provided at predetermined positions on the transverse members (leading section) 23, transverse members (riser section) 22, and horizontal main beam members 10 so that they are aligned in the predetermined staircase alignment.

[0104] J. Assembly Method (Example 1) J-1. Step 1 (Example 1): Fixing of horizontal main beam member (for upper floor) 11 and horizontal main beam member (for lower floor) 12 Step 1 explains each of the figures to be referenced. Figure 8 shows a plan view and a side view of step 1 of Example 1, with a cross-sectional view shown in section a. Figure 9 shows a magnified view of the assembly status of the preliminary unit (for the upper floor) in Step 1 of Example 1. Figure 10 shows a magnified view of the assembly status of the preliminary unit (for the lower floor) in Step 1 of Example 1. Figure 5 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 1. Figure 6 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the lower floor) of Example 1. Figure 18 shows the joint configuration when the upper floor 77 side is a steel beam / deck floor structure, and is an enlarged view of parts d and e in Figure 17, which is the assembly status in step 5 of Example 1.

[0105] Step 1 describes the assembly procedure. In the steel-framed upper floor 77, the horizontal main beam member (for the upper floor) 11, which is the starting end on the upper floor side, is positioned perpendicular to the steel beam 51 of the upper floor in a plan view (see Figure 18). The steel beams 51 of the upper floor are arranged in pairs of two, with their lower flanges being reinforced together with reinforcing plates 81 (see Figure 9). The horizontal main beam member (for the upper floor) 11 is first assembled with the transverse member (riser section) 21 attached to the preceding unit (for the upper floor) 31 (see Figure 5), and then the interlocking section (steel beam section) 79 is interlocked with the flange of the steel beam 51 and attached to the steel beam 51 of the upper floor 77 (see Figure 9). The starting units, the upper floor unit 31 and the lower floor unit 32, are fixed to the end face 85 of the upper floor unit 77 or the lower floor unit 78 (see Figures 9 and 10).

[0106] To hold the lead unit (for upper floor) 31 to the steel beam 51, the horizontal main girder retaining member 87 is pre-fixed transversely to the web side of the steel beam 51 at the intersection of the web of the steel beam 51 and the lower flange of the horizontal main girder (for upper floor) 11 of the lead unit (for upper floor) 31 (see Figure 9). The horizontal main beam member retainer 87 and the lower flange of the horizontal main beam member (for upper floor) 11 of the preceding unit (for upper floor) 31 are fixed together with bolts (see Figure 9).

[0107] - With only the horizontal main girder member holding member 87, the leading unit (for upper floor) 31 will rotate and fall off as a whole. Therefore, the transverse member (riser) 21, which is fixed in advance to the horizontal main girder member (for upper floor) 11 of the leading unit (for upper floor) 31, and the web or upper flange of the steel beam 51 are fixed with anchor reinforcement (for transverse member (riser)) 94 (see Figure 9).

[0108] In step 5, anchor bars (for RC connectors) 95 are installed on the end faces of the upper floor 77 and lower floor 78 so that they can be fixed to the RC connector 61 that will be cast (see Figures 9 and 10). In the lower floor 78, anchor bars (for horizontal main girders (for lower floor)) 96 are installed so that each horizontal main girder (for lower floor) 12 can be fixed to the lower floor 78 (see Figure 10).

[0109] J-2. Step 2 (Example 1): Pre-assembly of horizontal main beam members (intermediate) 13 and transverse members (leading section) 23 Step 2 will explain each of the figures to be referenced. Figure 7 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for intermediate use) of Example 1. Figure 11 shows a plan view and a side view of step 2 of Example 1, with a cross-sectional view shown in section c. Figure 12 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 11.

[0110] Step 2 describes the assembly procedure. In the narrow space between the starting horizontal main beam member (for upper floor) 11 and the horizontal main beam member (for lower floor) 12, a new leading unit (for intermediate floor) 33, which is a unit consisting of a horizontal main beam member (for intermediate floor) 13 and a transverse member (leading section) 23, is fixed in a stepped manner in advance.

[0111] J-3. Step 3 (Example 1): Fixing the inclined material (rod-shaped type) 41 in two stages, front and back. Step 3 will explain each of the figures to be referenced. Figure 7 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for intermediate use) of Example 1. Figure 13 shows a plan view and a side view of step 3 of Example 1, with a cross-sectional view shown in section c. Figure 14 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 13.

[0112] Step 3 describes the assembly procedure. In the preceding unit 30, which is fixed in a stepped manner, two inclined members (rod-shaped type) 41 are fixed to the front and rear of the transverse member (preceding section) 23.

[0113] J-4. Step 4 (Example 1): Fixing of the transverse member (riser portion) 21, the transverse member (riser portion) 22, and the inclined member (surface type) 42 Step 4 will explain each of the figures to be referenced. Figure 7 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for intermediate use) of Example 1. Figure 15 shows a plan view and a side view of step 4 of Example 1, with a cross-sectional view shown in section c. Figure 16 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 15.

[0114] Step 4 describes the assembly procedure. The preceding unit 30, to which inclined members (rod-shaped type) 41 are fixed in two stages (front and back), has a transverse member (riser part) 21, a transverse member (riser surface part) 22, and an inclined member (surface-shaped type) 42 fixed in a staircase-like arrangement. The transverse member (riser portion) 21 is fixed by interlocking its flange with the interlocking portion (riser portion) 80 of each horizontal main girder member 10 of the preceding unit 30.

[0115] J-5. Step 5 (Example 1): Concrete pouring for RC connector 61. Step 5 will explain each of the figures to be referenced. Figure 7 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for intermediate use) of Example 1. Figure 17 shows a plan view and a side view of step 5 of Example 1, with a cross-sectional view shown in section c. Figure 18 shows the joint configuration when the upper floor side is a steel beam 51 deck floor structure, and is an enlarged view of parts d and e in Figure 17, which is the assembly status in step 5 of Example 1.

[0116] Step 5 describes the assembly procedure. At the narrow spaces between the starting horizontal main beam member (for upper floor) 11 and the horizontal main beam member (for lower floor) 12, the inclined members (rod-shaped type) 41 and the inclined members (surface-shaped type) 42 are integrally poured with concrete to form an RC connector 61 at the junction of the upper floor 77 and the lower floor 78. • In this case, if the deck floor concrete 82 and the RC connecting body 61 are poured together as a single concrete structure, the structure will be strengthened. The transverse member (leading section) 23 of the leading unit (for upper floor) 31 is held in place by the support jack 101 until the concrete hardens.

[0117] J-6. Step 6 (Example 1): Completion Step 6 will explain each of the figures to be referenced. Figure 19 shows a plan view and a side view of step 6 of Example 1, with a cross-sectional view shown in section c.

[0118] Step 6 describes the assembly procedure. The assembled staircase is then fitted with treads 91, and the exterior and handrails (not shown) are attached to complete the assembly. [Examples]

[0119] Regarding Example 2, the following will explain, in order, the "staircase structure and alignment," "standards of constituent members," "structure of the preceding unit," and "assembly method."

[0120] K. Staircase structure and linearity (Example 2) The following explains each of the figures to be referenced. Figure 27 shows the side view, top view, and cross-sectional view of the preliminary unit (intermediate) of Example 2, with the A1-A1' and A2-A2' cross sections showing the outer and inner side views of the horizontal main beam members of the spiral line, respectively. Figure 31 shows a plan view and a side view of step 5 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-lined assembly staircase shown in section Q-Q'. Figure 32 shows the joint configuration when the upper floor is a PCaRC floor structure, and is an enlarged view of parts d and e in Figure 31, which is the assembly status in step 5 of Example 2. Figure 33 shows a plan view and a side view of step 6 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-lined assembly staircase shown in section Q-Q'.

[0121] This explains the staircase structure and its linearity. The structure of the upper floor 77 is a PCaRC floor structure. The staircase structure is a load-bearing staircase consisting of two rows of main stringers and narrow RC connecting members 61 and 103. Each of the two rows of main girders consists of 10 horizontal main girders made of light channel steel 62. The linear shape is spiral overall, and a transition curve member 75 is placed at the junction of the upper floor 77 and the lower floor 78.

[0122] L. Specifications of constituent materials (Example 2) The specifications of the components in Example 2 are generally the same as those in Example 1, except that a spiral is added to the straight lines, so a detailed explanation is omitted.

[0123] M. Structure of the preceding unit 30 (Example 2) Each horizontal main beam member (for upper floor) 11 is unitized with the transverse member 20 to form a lead unit (for upper floor) 31, a lead unit (for lower floor) 32, and a lead unit (for intermediate floor) 33, which are assembled in advance prior to the fixing of the two-tiered inclined members (rod-shaped type) 41. The following explains each of the figures to be referenced. Figure 25 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 2. Figure 26 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the lower floor) of Example 2. Figure 27 shows the side view, top view, and cross-sectional view of the preliminary unit (intermediate) of Example 2, with the A1-A1' and A2-A2' cross sections showing the outer and inner side views of the horizontal main beam members of the spiral line, respectively. Figure 43 is a hierarchical diagram showing the types of the prior art units of the present invention.

[0124] The structure of the preceding unit 30 is described below. Each of the two rows of main girders consists of 10 horizontal main girders made of light channel steel 62. The main girders, consisting of horizontal main girder members 10, are arranged transversely, and the transverse members (leading sections) 23 are initially integrated with the upper flanges using temporary bolts 71, with the bolts protruding upwards. The transverse members (leading sections) 23 are fixed to the top and bottom, and the structure is assembled in a stepped manner, while the temporary bolts 71 are rearranged so that the bolts protrude downwards (not shown). Bolt holes 73 are provided at predetermined positions on the transverse members (leading section) 23, transverse members (riser section) 22, and horizontal main beam members 10 so that they are aligned in the predetermined staircase alignment.

[0125] N. Assembly Method (Example 2) N-1. Step 1 (Example 2): Fixing of horizontal main beam member (for upper floor) 11 and horizontal main beam member (for lower floor) 12 Step 1 explains each of the figures to be referenced. Figure 25 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the upper floor) of Example 2. Figure 26 shows a side view, a top view, and a cross-sectional view of the preliminary unit (for the lower floor) of Example 2. Figure 28 shows a plan view and a side view of step 2 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-lined assembly staircase shown in section Q-Q'. Figure 32 shows the joint configuration when the upper floor is a PCaRC floor structure, and is an enlarged view of parts d and e in Figure 31, which is the assembly status in step 5 of Example 2.

[0126] Step 1 describes the assembly procedure. In the upper floor 77 of the PCaRC floor structure, the horizontal main beam member (for the upper floor) 11, which is the starting end on the upper floor 77 side, is positioned perpendicular to the end face 85 of the upper floor 77 on the PCaRC floor 83 side, in a plan view (see Figures 25 and 32). The horizontal main beam member (for the upper floor) 11 is assembled in advance with the transverse member (riser) 21 attached to the preceding unit (for the upper floor) 31, and then attached to the end face 85 on the PCaRC floor 83 side of the upper floor 77 (see Figures 25 and 32). The starting units, the upper floor unit 31 and the lower floor unit 32, are fixed to the end face 85 of the upper floor unit 77 or the lower floor unit 78 (see Figures 25, 26, and 32). The transverse members (riser parts) 21 that make up the preceding unit (for the upper floor) 31 are positioned and held in place using adjustment jacks 100 (see Figure 28).

[0127] To hold the lead unit (for upper floor) 31 to the end face 85 on the PCaRC floor 83 side, an L-shaped cutout 88 is provided on the side of the horizontal main beam member 10 opposite the stair surface, where the upper flange and web are cut out in an L-shape. A horizontal main beam member holding member 87, made of a shaped steel member, is positioned longitudinally along the web at the upper end of the L-shaped cutout 88 (see Figures 25 and 32). The horizontal main beam support member 87 is fixed to the back surface of the PCaRC floor 83 using anchor bars (for horizontal main beam support member) 93 that have been pre-installed on the PCaRC floor 83 side (see Figures 25 and 32).

[0128] - With only the horizontal main beam support member 87, the leading unit (for upper floor) 31 would rotate and fall off as a whole. Therefore, the transverse member (riser) 21, which is fixed to the horizontal main beam member (for upper floor) 11 of the leading unit (for upper floor) 31 in advance, and the end face 85 side of the PCaRC floor 83 are fixed with pre-installed anchor bars (for transverse member (riser)) 94 (see Figures 25 and 32).

[0129] In step 5 (see Figures 31 and 32), anchor bars (for RC connectors) 95 are installed on the end faces 85 of the upper floor 77 and lower floor 78 so that they can be anchored to the RC connector 61 that will be cast (see Figures 25, 26, 28, and 32). In the lower floor 78, anchor bars (for lower floor members) 96 are installed to fix each horizontal main beam member (for lower floor) 12 so that it can be fixed to the lower floor 78.

[0130] N-2. Step 2 (Example 2): Pre-assembly of horizontal main beam members (intermediate) 13 and transverse members (leading section) 23 Step 2 will explain each of the figures to be referenced. Figure 27 shows the side view, top view, and cross-sectional view of the preliminary unit (intermediate) of Example 2, with the A1-A1' and A2-A2' cross sections showing the outer and inner side views of the horizontal main beam members of the spiral line, respectively. Figure 28 shows a plan view and a side view of step 2 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-lined assembly staircase shown in section Q-Q'.

[0131] Step 2 describes the assembly procedure. In the narrow space between the starting horizontal main beam member (for upper floor) 11 and the horizontal main beam member (for lower floor) 12, a new leading unit (for intermediate floor) 33, which is a unit consisting of a horizontal main beam member (for intermediate floor) 13 and a transverse member (leading section) 23, is fixed in a stepped manner in advance. The horizontal and vertical positions of the starting horizontal main beam member (for the upper floor) 11 are held in place while making fine adjustments using the adjustment jack 100 and the support jack 101 (see Figure 28).

[0132] N-3. Step 3 (Example 2): Fixing the inclined material (rod-shaped type) 41 in two stages, front and back. Step 3 will explain each of the figures to be referenced. Figure 27 shows the side view, top view, and cross-sectional view of the preliminary unit (intermediate) of Example 2, with the A1-A1' and A2-A2' cross sections showing the outer and inner side views of the horizontal main beam members of the spiral line, respectively. Figure 29 shows a plan view and a side view of step 3 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-lined assembly staircase shown in section Q-Q'. Figure 30 shows a magnified view of the assembly process, corresponding to parts b and c in Figure 29.

[0133] Step 3 describes the assembly procedure. In the preceding unit 30, which is fixed in a stepped manner, two inclined members (rod-shaped type) 41 are fixed to the transverse member (preceding part) 23, one in front and one in back.

[0134] N-4. Step 4 (Example 2): Fixing of the transverse member (riser portion) 21, the transverse member (riser portion) 22, and the inclined member (surface type) 42 Step 4 of Example 2 is essentially the same as in Example 1, except that a spiral is added to the straight line, so the explanation is omitted.

[0135] N-5. Step 5 (Example 2): Concrete pouring for RC connector 61 and RC body 103 Step 5 will explain each of the figures to be referenced. Figure 27 shows the side view, top view, and cross-sectional view of the preliminary unit (intermediate) of Example 2, with the A1-A1' and A2-A2' cross sections showing the outer and inner side views of the horizontal main beam members of the spiral line, respectively. Figure 31 shows a plan view and a side view of step 5 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-lined assembly staircase shown in section Q-Q'. Figure 32 shows the joint configuration when the upper floor is a PCaRC floor structure, and is an enlarged view of parts d and e in Figure 31, which is the assembly status in step 5 of Example 2.

[0136] Step 5 describes the assembly procedure. At the narrow spaces between the starting horizontal main beam member (for upper floor) 11 and the horizontal main beam member (for lower floor) 12, the inclined members (rod-shaped type) 41 and the inclined members (surface-shaped type) 42 are integrally poured with concrete to form an RC connecting body 61 at the junction of the upper floor 77 and the lower floor 78. - Concrete is poured in a continuous line between the RC connecting body 61 at the junction of the upper floor 77 and the lower floor 78 to form an RC body 103. This increases the rigidity of the assembled staircase in a continuous line, minimizing swaying during ascent and descent. The transverse member (leading section) 23 of the leading unit (for upper floor) 31 is held in place by the support jack 101 until the concrete hardens.

[0137] N-6. Step 6 (Example 2): Completion Step 6 will explain each of the figures to be referenced. Figure 33 shows a plan view and a side view of step 6 of Example 2, with a cross-sectional view shown in section c, and a longitudinal section of the spiral-lined assembly staircase shown in section Q-Q'.

[0138] Step 6 describes the assembly procedure. The assembled staircase is then fitted with treads 91, and the exterior and handrails (not shown) are attached to complete the assembly.

[0139] In summary, the preferred "staircase structure and alignment," "standards of constituent members," "structure of the preceding unit," and "assembly method" of the present invention have been described for Example 1, in which the upper floor structure is a steel beam / deck floor structure, and Example 2, in which the upper floor structure is a PCaRC floor structure. As a result, the present invention can achieve the following effects shown in 7) to 10).

[0140] 7) Conventionally, staircase structures for steel frame structures on the building side often consisted of steel stringer staircases, which allowed for easy fixing of the steel beams to the web at the upper floor. However, this fixing point inevitably suffers from reduced durability due to stress concentration. However, in this invention, the number of rows of horizontal main girders 10 can be increased in the design. This increases the number of fastening points between the upper floor side and the horizontal main girders (for upper floor) 11, thereby mitigating stress concentration (see Figure 18).

[0141] 8) Traditionally, residential staircases have often been wooden staircases without stringer structures, such as L-shaped staircases or spiral staircases. Therefore, it has been difficult to adopt stringer-structured staircases that would look good in the living room. However, the present invention allows for the use and fixation of a horizontal main beam member (for upper floor) 11 having an L-shaped cutout 88 on the opposite side of the stair surface, an opposite surface member 90, and an L-shaped cutout crossing member 89 to the wooden beam 52 of the upper floor (see Figure 37). Furthermore, the crossing members (riser portion) 21 of each floor can be fixed to the interior wall (not shown). Therefore, by integrating with both the wooden beam 52 of the upper floor and the interior wall, it is possible to use a L-shaped staircase or a spiral staircase structure that can be expected to share the load and save space. Consequently, even in the staircase structure of a house, an elegant spiral beam structure staircase can be adopted.

[0142] 9) In general, for staircases with a stringer structure, the "internal grid structure of main stringers and transverse stringers" is difficult to achieve, except for RC (reinforced concrete) staircases, which are complicated to construct. However, in addition to the lattice structure 59 of horizontal main beams 10 and transverse members (riser parts) 21, the present invention allows for the formation of a three-dimensional lattice structure 60 by using two inclined members (rod-shaped type) 41, one in front and one behind, which are fixed to the transverse members (leading parts) 23 at an angle in the direction of the stair axis (see Figures 14 and 30). Therefore, the rigidity is effectively increased, and a slender and structurally rational prefabricated staircase is constructed.

[0143] 10) Conventionally, in the case of spiral girder staircases, the accuracy and quality of the bending process into a spiral was inconsistent, and the long spiral members were costly to transport and assemble. However, in the case of a spiral staircase, the assembled staircase of the present invention does not involve "bending into a spiral" or "long members exhibiting a spiral shape" in its constituent components, the horizontal main beam 10, transverse members 20, and inclined members 40. Therefore, regardless of whether it is a straight or spiral staircase, it can be manufactured inexpensively and assembled simply and accurately. [Explanation of Symbols]

[0144] 10 horizontal main girder material, 11 horizontal main girder material (for upper floor), 12 horizontal main girder material (for lower floor), 13 Horizontal main beam members (for intermediate use), 20 Transverse members, 21 Transverse members (riser section), 22 Cross section (tread section), 23 Cross section (leading section), 30 Leading unit, 31 Pre-installation unit (for upper floor), 32 Pre-installation unit (for lower floor), 33 Leading unit (for intermediate use), 40 Inclined material, 41 Inclined material (rod-shaped type), 42 Inclined material (surface type), 43 Inclined material (surface type for assembly), 50 Upper floor beam, 51 Steel beam, 52 Wooden beam, 53 Tread, 54 Riser, 55 Main girder, 56 Support girder, 57 Box girder, 58 Fixed joint, 59 Lattice structure, 60 Three-dimensional lattice structure, 61 RC connector, 62 Light channel steel, 71 Temporary bolt, 72 Bolt and nut, 73 bolt holes, 75 transitional curve members, 77 upper floor, 78 lower floor, 79. Interlocking part (steel beam section), 80. Interlocking part (riser section), 81. Reinforcement plate, 82 Deck floor concrete, 83 PCaRC floor, 84 PCaRC wall, 85 End face, 86 Wooden floor, 87 Horizontal main beam support member, 88 L-shaped defect, 89 L-shaped defect cross section member, 90 opposite face member, 91 tread plate member, 92 anchor reinforcement, 93 Anchor reinforcement (for holding horizontal main beam members), 94 Anchor reinforcement (for transverse members (riser part)), 95 Anchor reinforcement (for RC connectors), 96 Anchor reinforcement (for horizontal main beam members (for lower floor)), 97 Bolt and nut (vertical), 98 Through hole (for anchor reinforcement fixing), 99 Fixing material (for fixing anchor bars), 100 Adjustment jack, 101 Shoring jack, 102 Center of the arc, 103 RC body

Claims

1. A horizontal main girder member consisting of at least a structural steel member, A transverse member consisting of a shaped steel member or a steel plate member, An inclined material consisting of a rod-shaped inclined material or a planar inclined material, Composed of, Two or more of the horizontal main beam members have treads on the upper flange side of the horizontal main beam members, and the girder direction of the horizontal main beam members is horizontal and oriented in the direction of the stair axis, with adjacent flanges vertically offset by the dimension of the tread and fixed in sequence, so that risers and treads alternate in a staircase pattern. Multiple of the aforementioned transverse members are fixed horizontally and transversely to two or more rows of the horizontal main girders. The inclined member is fixed to multiple of the transverse members or two or more rows of the horizontal main beam members at an inclination in the direction of the stair axis. A prefabricated staircase characterized by the following features.

2. In the assembly staircase according to claim 1, A first step involves fixing at least two rows of the starting horizontal main beam members to the end face of the upper or lower floor, A second step involves arranging and fixing two or more rows of new horizontal main girders, multiple transverse members, and inclined members in a stepped manner to two or more rows of the aforementioned starting horizontal main girders, The construction includes a third step of forming an RC connection by integrally pouring concrete into any narrow space of at least two rows of the horizontal main beam members that serve as the starting point, and connecting and fixing the assembled staircase to the end face of the upper or lower floor. A method for assembling a prefabricated staircase, characterized by the features described herein.

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