Construction method of boundary wall for stairs

Abstract

To improve construction efficiency when constructing a boundary wall dividing between a pair of turn-back stairs.SOLUTION: In a construction method of the boundary wall for stairs, a plurality of panel bodies 31 are installed between a pair of turn-back stairs 10, 20 extending over many floors to construct the boundary wall for the stairs partitioning the pair of turn-back stairs 10, 20, an X staircase construction step of constructing an X staircase by installing a pair of staircase portions 11, 21 for one floor in an X shape facing each other with a boundary wall installation space S interposed therebetween in order from the lowermost floor of the pair of turn-back stairs 10, 20 is performed, and, to the boundary wall uninstalled space Sa at the lowest level at that stage every time the boundary wall uninstalled space Sa in which the boundary wall 30 is not installed reaches a predetermined number of floors in the boundary wall installation space S by the execution of the X staircase construction process, a panel body installation process is performed in which a panel body 31 of a predetermined number for constructing a boundary wall portion 30A for one floor is lifted and inserted from the boundary wall uninstalled space Sa on the upper floor to be installed.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a method for constructing a staircase partition wall, in which a plurality of panel bodies are installed between a pair of return staircases spanning multiple floors to construct a staircase partition wall that separates the pair of return staircases. [Background technology]

[0002] The background art of the present invention includes, for example, a multi-story building such as a dormitory or a complex building, in which a partition wall (partition wall) is constructed between a pair of spiral staircases spanning multiple floors to separate the two (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-163843 Summary of the Invention [Problem to be solved by the invention]

[0004] When constructing a partition wall for a staircase in a multi-story building as described above, it is common to install a support member that supports and receives a panel body having a plurality of gypsum boards or the like that constructs the partition wall on the side of the staircase in an oblique position along the gradient of the staircase. Therefore, it is necessary to cut the upper and lower sides of each panel body that is supported by the support member at an angle according to the installation position of the support member. In addition, on a staircase where footing is likely to be unstable, it is necessary to install a plurality of panel bodies of different shapes on the support member in an oblique position according to a predetermined procedure. As a result, this leads to an inconvenience of reduced construction efficiency when constructing a partition wall that separates a pair of return staircases.

[0005] In view of this situation, a main object of the present invention is to improve the construction efficiency when constructing a partition wall that separates a pair of spiral staircases. [Means for solving the problem]

[0006] The first characteristic configuration of the present invention is a construction method for a staircase partition wall, which comprises installing a plurality of panel bodies between a pair of return staircases spanning multiple floors to construct a staircase partition wall that separates the pair of return staircases, An X-staircase construction process is carried out in which the pair of turn-back staircases are installed in order from the lowest floor to the other floor in an X-shape with a partition wall installation space between them to construct an X-staircase. The X-staircase construction process is performed, and each time the number of partition-wall-not-installed spaces among the partition-wall-installed spaces reaches a predetermined number of floors, a panel body installation process is performed in which a predetermined number of panel bodies constituting a partition-wall portion for one floor are lifted and inserted from the partition-wall-not-installed space of the upper floor and installed in the partition-wall-not-installed space of the lowest floor at that stage.

[0007] According to this configuration, the partition-wall installation space of the X-shaped staircase formed in the X-shaped staircase construction process is a rectangular space with the X-shaped staircase as its diagonal. Therefore, by carrying out the panel body installation process and lifting a predetermined number of panel bodies into the lowest partition-wall-free space and inserting and installing them from the partition-wall-free space on the upper floor, a rectangular partition-wall portion for one floor corresponding to the rectangular partition-wall-free space can be constructed. This means that, for example, when constructing a partition wall portion for one floor, compared to installing support members that receive and support the panel bodies on the side of the stairs at an angle that follows the gradient of the stairs, it is possible to eliminate the trouble of cutting the upper and lower edges of each panel body at an angle according to the installation orientation of the support members, and the trouble of installing multiple panel bodies of different shapes on oblique support members according to specified procedures on stairs where footing is prone to be unstable. As a result, construction efficiency can be improved when constructing a partition wall that separates a pair of spiral staircases.

[0008] However, for example, if a certain number of panel bodies are installed in a parting-wall installation space each time a parting-wall installation space is formed in the X-shaped staircase construction process, when formwork, reinforcing bars, etc. are carried in from a lower floor where construction of the framework has been completed to an upper floor where construction of the framework has not been completed using the constructed X-shaped staircase, the panel bodies are installed in the parting-wall installation space of the X-shaped staircase to be used. Therefore, the formwork, reinforcing bars, etc. carried in using the X-shaped staircase may come into contact with the panel bodies installed in the parting-wall installation space, easily causing inconvenience and damaging the panel bodies.

[0009] In contrast, in the present configuration, a lag in the construction period is provided in that each time the number of spaces without parting walls reaches a predetermined number of floors during the X-shaped staircase construction process, a panel body installation process is carried out for the lowest space without parting walls at that stage. And if the difference in construction period is, for example, the period required for construction of the framework on the lowest construction floor that has a space where a parting wall has not yet been installed, when using the constructed X-shaped staircase to carry formwork, reinforcing bars, etc. from the lower floor where construction of the framework has been completed to the upper floor where construction of the framework has not been completed, there will be no panel body installed in the parting wall installation space of the X-shaped staircase to be used. This makes it possible to use the constructed X-shaped staircase to carry formwork, reinforcing bars, etc. from the lower floor, where construction of the framework has been completed, to the upper floor, where construction of the framework has not been completed, thereby preventing the formwork, reinforcing bars, etc. from coming into contact with the panel body installed in the parting wall installation space and damaging the panel body. As a result, the partition wall separating the pair of spiral staircases can be constructed at an optimal construction time to avoid damage caused by contact with formwork, reinforcing bars, etc.

[0010] A second characteristic configuration of the present invention is that a temporary handrail mounting portion that enables the attachment of a temporary handrail via a bracket is provided on an inner surface of the staircase portion that faces the partition wall installation space, The bracket is provided with a protruding portion that protrudes from the bracket toward the staircase portion to enable the temporary handrail to be installed on the tread surface of the staircase portion, Each time the X-staircase is constructed in the X-staircase construction process, a temporary handrail installation process is carried out in which the temporary handrail is installed on the tread surface of the staircase portion using the bracket.

[0011] According to this configuration, each time the X staircase is constructed in the X staircase construction process, the temporary handrail installation process is carried out to install the temporary handrail on the staircase portion. As a result, when ascending or descending the X staircase where the partition wall portion made of the panel body is not constructed in the partition wall installation space, the temporary handrail can be used, and ascending or descending the X staircase can be performed without hindrance. As a result, without interfering with ascending and descending the X-shaped staircase, a staggering of the construction period for carrying out the panel body installation process for the lowest space at a stage where a partition wall is not installed can be provided each time the number of spaces at which a partition wall is not installed reaches a predetermined number of floors in the X-shaped staircase construction process, and this staggering of the construction period can be advantageously used to prevent damage to the partition walls.

[0012] Furthermore, because the bracket is provided with the above-mentioned protruding portion, in the temporary handrail installation process, the temporary handrail is installed on the tread surface of the staircase portion outside the above-mentioned partition wall installation space (space where a partition wall is not installed). This makes it possible to prevent the panel body from coming into contact with the temporary handrail during the panel body installation process, for example, when the temporary handrail is to be installed in the partition wall installation space (space where a partition wall is not installed), thereby eliminating the need for a temporary handrail dismantling process that must be performed before the panel body installation process is carried out, while preventing the panel body from coming into contact with the temporary handrail and damaging it. As a result, it is possible to further improve the construction efficiency when constructing a partition wall that separates a pair of spiral staircases, while also being able to construct the partition wall in an ideal condition in which damage due to contact with a temporary handrail is prevented.

[0013] The third characteristic configuration of the present invention is a plate-shaped buffer member that covers the mounting tool that mounts the bracket to the temporary handrail mounting part from the outer surface side of the bracket together with the outer part of the bracket, The temporary handrail installation process includes a buffer member attachment process of attaching the buffer member to the outer surface side of the bracket each time the bracket is attached to the temporary handrail mounting portion.

[0014] According to this configuration, when the cushioning member mounting process is carried out, the mounting fixture that mounts the bracket to the temporary handrail mounting portion of the staircase section, together with the outer portion of the bracket, becomes covered from the outer surface side of the bracket with the plate-shaped cushioning member. This makes it possible to avoid the risk of the panel body coming into contact with and being damaged by fixtures or brackets attached to the X-shaped staircase on the upper floor when the panel body is lifted and inserted into the space on the upper floor where no parting wall is installed during the panel body installation process. As a result, the partition wall separating a pair of return staircases can be constructed in an ideal condition while avoiding damage due to contact with fixtures or brackets.

[0015] The fourth characteristic configuration of the present invention is that it includes a panel unit pre-assembly process in which a predetermined number of the panel bodies constituting the partition wall portion for one floor are pre-assembled onto a horizontal support member that has grooves into which their lower ends are inserted in a row and supports the panel bodies, thereby constructing a panel unit whose in-plane length is the same or approximately the same as the separation distance between the landings of the same floor in the pair of return staircases.

[0016] According to this configuration, in the panel body installation process, the panel unit pre-assembled in the panel unit pre-assembly process is lifted and inserted into the space on the upper floor where a parting wall is not installed, and then installed in the lowest space where a parting wall is not installed. This makes it possible to significantly reduce the time required for the panel installation process, compared to, for example, lifting a specified number of panel bodies that make up the partition wall portion for one floor individually and inserting them into the space on the lowermost floor where a partition wall is not installed, and installing them in the space where a partition wall is not installed on the lowest floor. As a result, construction efficiency can be further improved when constructing a partition wall that separates a pair of spiral staircases. [Brief description of the drawings]

[0017] [Figure 1] A vertical cross-section of a stairwell showing a pair of spiral staircases separated by a staircase partition wall. [Diagram 2] Plan view of a stairwell showing a pair of spiral staircases separated by a staircase partition wall. [Diagram 3] A vertical cross-sectional view of a stairwell showing the temporary handrails attached to each staircase during the temporary handrail installation process. [Figure 4] Vertical cross-section of the staircase showing the state where the space without partition walls has reached the specified number of floors during the X staircase construction process [Diagram 5] An enlarged view of the main parts of the temporary handrail installation structure during the temporary handrail installation process. [Figure 6] An enlarged vertical cross-sectional view of the main part of the temporary handrail installation structure during the temporary handrail installation process, and the state in which the panel unit is lifted and inserted into the space above where no parting wall is installed during the panel body installation process. [Figure 7] A vertical cross-sectional view of the stairwell showing the panel unit being lifted and inserted into the space above where no parting wall has been installed during the panel installation process. [Figure 8] A vertical cross-sectional view of the stairwell showing the panel unit installed and fixed in the lowest parting wall-free space during the panel installation process. [Figure 9] FIG. 13 is a perspective view of a main part showing a state in the middle of pre-assembling a panel unit in a panel unit pre-assembly process; [Figure 10] An enlarged vertical cross-sectional view of a main part showing the attachment of a decorative panel after the panel unit is installed in the panel body installation process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of a construction method for a staircase parting wall according to the present invention will be described with reference to the drawings.

[0019] The construction method of the staircase partition wall exemplified in this embodiment is a construction method suitable for constructing a staircase partition wall 30 that separates a pair of return staircases 10, 20 that span multiple floors in a single staircase 1 constructed in a state in which the pair of return staircases 10, 20 are overlapped in a double spiral shape, as shown in Figures 1 and 2. By using this construction method, the staircase partition wall 30 can be easily and suitably constructed in the single staircase 1 together with the pair of return staircases 10, 20, and the pair of return staircases 10, 20 constructed in the single staircase 1 can be used as two direct staircases that connect multiple floors to the evacuation floor.

[0020] As shown in Figures 1 to 3, a pair of return stairs 10, 20 are constructed by carrying out an X-stair construction process in which paired first-floor staircase parts 11, 21 are installed in an X-shape with a partition wall installation space S between them, starting from the lowest floor, to construct an X-staircase. Each staircase part 11, 21 is made of precast concrete manufactured in a factory or a production yard at a construction site. The partition wall installation space S of the X-staircase is a rectangular space in a side view between the landings 2 of the pair of return stairs 10, 20, with the pair of staircase parts 11, 21 constructing the X-staircase as diagonal lines. At both upper and lower ends of each staircase part 11, 21, connection parts 11A, 21A are formed that are connected to the landing 2 while being supported by the staircase support parts 2A provided on the landing 2 of each floor. Incidentally, each of the staircase sections 11, 21 is not limited to being made of precast concrete, and may be made at the construction site.

[0021] 3 to 6, the inner surface of each staircase section 11, 21 facing the partition wall installation space S is provided with a plurality (four in this embodiment) of temporary handrail mounting parts 11B, 21B that enable the attachment of a temporary handrail 4 made of a single pipe via a plurality (four in this embodiment) of brackets 3. Each temporary handrail mounting part 11B, 21B is formed by a pair of long nuts 11a, 21a embedded in the inner surface side of the staircase section 11, 21. Furthermore, each temporary handrail mounting portion 11B, 21B is not limited to being formed by a pair of long nuts 11a, 21a, but may also be formed by a pair of embedded bolts protruding laterally outward from the inner surface of the staircase portion 11, 21.

[0022] As shown in Figs. 5 and 6, each bracket 3 is provided with a mounting portion 3A that is attached to the temporary handrail mounting portion 11B, 21B of the staircase portion 11, 21 using a bolt 5, which is an example of a mounting tool, and a protruding portion 3B that protrudes from each bracket 3 toward the staircase portion 11, 21 side to allow the temporary handrail 4 to be installed on the tread surface 11C, 21C of the staircase portion 11, 21. The mounting portion 3A is formed of a steel plate whose upper and lower edge portions are formed into a substantially parallelogram shape that follows the gradient of the staircase portion 11, 21. The protruding portion 3B is formed of an L-shaped steel welded to the upper end portion of the mounting portion 3A. The L-shaped steel is welded to the upper end portion of the mounting portion 3A in an L-shaped position with one side facing diagonally upward on the tread surface 11C, 21C of the staircase portion 11, 21. The fixture is not limited to the bolts 5, and for example, when each of the temporary handrail mounting parts 11B, 21B is formed of a pair of embedded bolts, nuts or the like can be used.

[0023] Each temporary handrail 4 is integrally provided with a catch clamp 4A that clamps the upper end side (one side of the L-shaped steel facing upward) of the protruding portion 3B of the bracket 3. This makes it easy to attach and detach the temporary handrail 4 to and from the temporary handrail mounting portions 11B, 21B of each staircase section 11, 21 via the bracket 3.

[0024] Each bracket 3 is provided with a plate-shaped buffer member 7 that is attached to the bracket 3 using a cable tie 6. Each buffer member 7 is formed so that, when attached to the bracket 3, it covers, together with the outer parts of the bracket 3, a pair of bolts 5 that attach the bracket 3 to the temporary handrail mounting parts 11B, 21B of the staircase sections 11, 21 from the outer surface side of the bracket 3.

[0025] As shown in Fig. 1, a staircase partition wall 30 is constructed by installing a plurality of panel bodies 31 between a pair of return staircases 10, 20 spanning multiple floors, so as to separate the pair of return staircases 10, 20. A fire-resistant rectangular sandwich panel is used for each panel body 31. The sandwich panel has a sandwich structure in which a non-combustible material such as glass wool is sandwiched between a pair of plated metal plates such as ZAM steel plates that form the surface of the sandwich panel. Each panel body 31 is not limited to a sandwich panel, and may be, for example, a panel configured using a plurality of gypsum boards or ALC (lightweight aerated concrete) panels.

[0026] As shown in Fig. 1 and Figs. 7-8, each panel body 31 is formed in a rectangular shape of the same size so that a predetermined number of panel bodies 31 (four in this embodiment) are connected in a row in the left-right width direction of the panel body 31 to construct a partition wall portion 30A for one floor that separates a pair of staircase portions 11 and 21 for one floor. As shown in Fig. 9, a protrusion portion 31A is formed at one left and right end of each panel body 31, which extends from the upper and lower ends. A groove portion 31B is formed at the other left and right end of each panel body 31, which extends from the upper and lower ends. The protrusion portion 31A and the groove portion 31B function as a positioning portion that prevents the connected panel bodies 31 from being misaligned in the front-rear direction when the panel bodies 31 are connected in the left-right width direction by fitting the protrusion portion 31A into the groove portion 31B.

[0027] As shown in Fig. 1, 6 and 7, the partition wall 30 for the staircase includes a plurality of support members 32 that support a predetermined number (four in this embodiment) of panel bodies 31 connected in the left and right width direction of the panel body 31. As shown in Fig. 6, 9 and 10, each support member 32 is configured by welding a pair of guide members 34 made of a metal plate bent into an L-shaped cross section to each of the upper and lower flanges of the H-shaped steel 33. With this configuration, each support member 32 has upper and lower grooves 32A, 32B between the pair of guide members 34 that support the lower end or upper end of a predetermined number of panel bodies 31. As shown in Fig. 1, 7 and 9, each support member 32 is provided with bolt joints 32C that are bolted to the joints 2B provided at the bottom of the landing 2 facing them via the joint plates 8 (see Fig. 8) at both ends of the web of the H-shaped steel 33. Each support member 32 is not limited to the above configuration, and may be, for example, a square steel pipe instead of the H-shaped steel 33.

[0028] As shown in Figures 1 and 10, the staircase partition wall 30 is provided with a pair of decorative panels 35 that cover and conceal each of the support members 32. Each decorative panel 35 is formed to straddle the support members 32 and span the lower end of the panel body 31 on the upper floor side and the upper end of the panel body 31 on the lower floor side. Each decorative panel 35 is provided on the staircase partition wall 30 in a state of covering and concealing the support members 32 by having its upper end fixed to the lower end of the panel body 31 on the upper floor side with screws 9 (see Figure 10) and its lower end fixed to the upper end of the panel body 31 on the lower floor side with screws 9.

[0029] Next, a construction method for the staircase parting wall exemplified in this embodiment will be described in detail. The construction method for a staircase partition wall exemplified in this embodiment includes a panel unit pre-assembly process in which a predetermined number of panel bodies 31 constituting one floor of the partition wall portion 30A are pre-assembled as a panel unit PU (see Figures 1, 7 to 8) in a production yard at the construction site. In the panel unit pre-assembly process, as shown in FIG. 9, first, a support member placement process is carried out in which the support member 32 is placed in a horizontal position on a workbench in the production yard with its upper groove portion 32A facing upward and in an open state. Next, a panel body insertion process is performed in which a predetermined number of panel bodies 31 are erected one after another and their lower ends are inserted into the upper grooves 32A of the horizontal support members 32, and a panel body connecting process is performed in which the panel bodies 31 with their lower ends inserted into the grooves 32A of the support members 32 are moved along the grooves 32A to predetermined positions on the support members 32, and the predetermined number of panel bodies 31 are connected in a row in their width direction. Then, in a state in which the predetermined number of panel bodies 31 are connected in this manner, one protrusion 31A of an adjacent panel body 31 fits into the other groove 31B, thereby preventing the connected panel bodies 31 from shifting in position in the front-rear direction. Thereafter, a panel body fixing process is carried out in which the lower end portions of the connected panel bodies 31 are screwed to the respective guide members 34 of the support member 32 to fix each panel body 31 to the support member 32.

[0030] That is, in the panel unit pre-assembly process, the above-mentioned support member arranging process, panel body inserting process, panel body connecting process, and panel body fixing process are carried out, so that a predetermined number of panel bodies 31 constituting one floor's partition wall portion 30A can be pre-assembled to the support member 32 with their lower ends inserted in a row into the upper grooves 32A of the support member 32 and supported and fixed. This pre-assembly makes it possible to construct a panel unit PU whose in-plane length L1 is the same or approximately the same as the separation distance L2 (the width of the partition wall installation space S) between the landings 2 of the same floor of the pair of return staircases 10, 20, as shown in Fig. 1.

[0031] The construction method of the staircase partition wall exemplified in this embodiment includes a temporary handrail installation process of installing a temporary handrail 4 on the treads 11C, 21C of the staircase portions 11, 21 using a bracket 3 every time an X-staircase for one floor is constructed in the X-staircase construction process, as shown in Figs. 3 to 6. In the temporary handrail installation process, first, a bracket mounting process is carried out in which the mounting portion 3A of each bracket 3 is attached to each temporary handrail mounting portion 11B, 21B of the staircase portions 11, 21 that constitute the X-staircase using multiple bolts 5 so that the protruding portion 3B of each bracket 3 is positioned on the tread surfaces 11C, 21C of the staircase portions 11, 21. Next, a buffer member attachment process is carried out in which the buffer member 7 is attached to the outer surface of the bracket 3 attached to each temporary handrail attachment portion 11B, 21B of the staircase portions 11, 21 using cable ties 6 in a state in which it covers the outer portion of the bracket 3 and the heads of each bolt 5 from the outer surface of the bracket 3. However, if the staircase portions 11, 21 are the lowest staircase portions 11, 21 of the pair of return staircases 10, 20, there is no need to attach the buffer member 7, and therefore the buffer member attachment process is not carried out. Then, a temporary handrail installation process is carried out in which each catch clamp 4A of the temporary handrail 4 is clamped to the protruding portion 3B of each bracket 3 located on the treads 11C, 21C of the staircase portions 11, 21, and the temporary handrail 4 is attached to the protruding portion 3B of each bracket 3.

[0032] That is, in the temporary handrail installation process, the bracket attachment process, the buffer member attachment process, and the temporary handrail installation process are carried out, so that each temporary handrail 4 can be installed on the treads 11C, 21C of each staircase section 11, 21. As a result, regardless of the installation of each temporary handrail 4, the partition wall installation space S formed between the paired staircase sections 11, 21 can be secured.

[0033] The construction method of the staircase partition wall exemplified in this embodiment includes a panel body installation process of installing a predetermined number of panel bodies 31 and the like for constructing a partition wall portion 30A for one floor in a partition wall installation space S formed between a pair of staircase portions 11 and 21 for one floor, as shown in Figs. 6 to 8 and 10. While the X-staircase construction process is being carried out, the panel body installation process is carried out on the partition wall-not-installed space Sa that is the lowest at that stage, each time the partition wall-not-installed space Sa in which the partition wall 30 for the staircase is not installed reaches a predetermined number of floors (three floors in this embodiment) as a result of the execution of the X-staircase construction process. Then, when the X-staircase construction process is completed, the panel body installation process is carried out on each partition wall-not-installed space Sa remaining at that stage, starting from the lowest partition wall-not-installed space Sa.

[0034] In the panel body installation process, first, a temporary handrail removal process is carried out in which the temporary handrails 4, brackets 3, etc. are removed from each pair of staircase sections 11, 21 separated by the lowest parting-wall-free space Sa, and then carried to the topmost staircase section 11, 21. The removed temporary handrails 4, brackets 3, etc. will be used in the temporary handrail installation process after the next X-staircase for one floor is constructed in the X-staircase construction process described above. Next, a panel unit lifting and arranging process is carried out in which the panel unit PU preassembled in the panel unit preassembly process is lifted and the lifted panel unit PU is inserted from the space Sa on the upper floor where no partition wall is installed to arrange it in the lowest space Sa where no partition wall is installed. At this time, if the lowest space Sa where no partition wall is installed is the lowest space S where a partition wall is installed in the pair of return staircases 10, 20, the support member 32 of the lifted panel unit PU is arranged in a panel installation section provided on the lowest floor of the pair of return staircases 10, 20. If the lowest space Sa where no partition wall is installed is not the lowest space S where a partition wall is installed in the pair of return staircases 10, 20, the support member 32 of the lifted panel unit PU is arranged on the panel unit PU of the floor immediately below with the upper end of each panel body 31 of the panel unit PU arranged in the space S where a partition wall is installed in the floor immediately below being fitted in the groove portion 32B on the lower side. Then, a panel unit fixing process is carried out in which each bolt joint 32C of the support member 32 in the panel unit PU arranged in the lowest space Sa where no partition wall is installed is bolted to the corresponding connection part 2B of the landing 2 opposite them via a connection plate 8, thereby fixing the panel unit PU to the lowest space Sa where no partition wall is installed. Then, in the panel unit fixing process, each time a panel unit PU is fixed to the partition wall installation space S on the second floor and beyond of a pair of return staircases 10, 20, a decorative panel installation process is carried out in which the support member 32 of the fixed panel unit PU is covered and concealed by a pair of decorative panels 35.

[0035] In other words, in the panel body installation process, the above-mentioned temporary handrail removal process, panel unit lifting and positioning process, panel unit fixing process, and decorative panel installation process are carried out, so that each panel unit PU can be installed and fixed in the partition wall installation space S secured between the corresponding one-floor staircase portions 11, 21, and can be installed in an attractive manner in a vertically connected row between the pair of return staircases 10, 20.

[0036] As described above, in the construction method for a staircase partition wall exemplified in this embodiment, the above-mentioned X-shaped staircase construction process is carried out, and when the above-mentioned partition-wall-not-installed space Sa among the rectangular partition-wall-installed space S secured between a pair of staircase sections 11, 21 constructing the X-shaped staircase reaches a predetermined number of floors, a panel body installation process is carried out each time the predetermined number of floors is reached, and a rectangular partition-wall section 30A for one floor corresponding to the lowest partition-wall-not-installed space Sa at that stage is constructed.

[0037] This construction method for staircase partitioning walls includes the above-mentioned panel unit pre-assembly process, so that in the panel body installation process, the panel unit PU pre-assembled in the panel unit pre-assembly process is lifted and inserted from the space Sa on the upper floor where a partition wall is not installed, and then installed in the lowest space Sa where a partition wall is not installed. This makes it possible to significantly reduce the time required for the panel body installation process compared to, for example, a case in which a specified number of panel bodies 31 constituting one floor's worth of partition wall portion 30A are individually lifted and inserted into the space Sa on the upper floor where a partition wall is not installed and installed in the lowest space Sa where a partition wall is not installed.

[0038] In addition, in this method of constructing staircase parting walls, a lag in the construction period is provided by carrying out a panel body installation process for the lowest parting-wall-free space Sa at that stage each time the parting-wall-free space Sa reaches a predetermined number of floors in the X-staircase construction process. And if the difference in the construction period is, for example, the period required for construction of the framework on the construction floor having the lowest parting-wall-free space Sa, then when the constructed X-shaped staircase is used to carry the temporary handrails 4 and formwork from the lower floor where the framework construction has been completed to the upper floor where the framework construction has not been completed, the panel unit PU will not be installed in the parting-wall installation space S of the X-shaped staircase to be used. As a result, when using the constructed X-shaped staircase to carry temporary handrails 4, formwork, etc. from a lower floor where construction of the structural frame has been completed to an upper floor where construction of the structural frame has not been completed, it is possible to avoid the risk of the temporary handrails 4, formwork, etc. coming into contact with the panel body 31 of the panel unit PU installed in the partition wall installation space S and damaging the panel body 31.

[0039] Furthermore, in this construction method for a partition wall for stairs, the above-mentioned temporary handrail installation process is carried out each time an X staircase is constructed in the above-mentioned X staircase construction process, and the temporary handrail 4 is installed on the pair of staircase sections 11, 21 that constitute the X staircase. Therefore, when ascending or descending the X staircase where the partition wall section 30A made of the panel unit PU is not constructed in the partition-wall installation space S, the temporary handrail 4 can be used, and ascending or descending the X staircase can be carried out without hindrance. This makes it possible to provide the aforementioned staggered construction periods without interfering with ascending and descending the X-shaped staircase, and it is possible to preferably prevent damage to each panel body 31 that would otherwise result from staggering the construction periods.

[0040] Moreover, since each bracket 3 used to attach the temporary handrail 4 in the temporary handrail installation process is provided with the above-mentioned protruding portion 3B, in the temporary handrail installation process, each temporary handrail 4 can be installed on the treads 11C, 21C of the staircase portions 11, 21 outside the above-mentioned partition-wall installation space S (space Sa where no partition wall is installed). This makes it possible to prevent the panel unit PU from contacting the temporary handrail 4 in the panel body installation process, for example, when each temporary handrail 4 is installed in the partition-wall installation space S (space Sa where no partition wall is installed), while eliminating the need for a temporary dismantling process of the temporary handrail 4 that must be performed before the panel body installation process is carried out, and prevents the panel unit PU from contacting the temporary handrail 4 and damaging the panel body 31.

[0041] Furthermore, since the temporary handrail installation process includes the aforementioned cushioning member attachment process, when the panel unit PU is lifted and inserted from the space Sa on the upper floor where the parting wall is not installed during the panel body installation process, each bolt 5 attaching each bracket 3 to the temporary handrail attachment portions 11B, 21B of each staircase portion 11, 21, together with the outer parts of the brackets 3, are covered by the plate-shaped cushioning members 7 from the outer surface side of each bracket 3. This makes it possible to avoid the risk of the panel body 31 of the panel unit PU coming into contact with and being damaged by the bolts 5 and brackets 3 attached to each staircase portion 11, 21 on the upper floor when the panel unit PU is inserted from the space Sa on the upper floor where the parting wall is not installed during the panel body installation process.

[0042] As a result, while effectively improving construction efficiency when constructing a staircase partition wall 30 that separates a pair of return staircases 10, 20, the staircase partition wall 30 can be easily constructed in a favorable condition in which damage to the panel body 31, etc. caused by the panel unit PU coming into contact with the temporary handrails 4 attached to each staircase section 11, 21, or the bolts 5 and brackets 3 for attaching the temporary handrails, is more reliably avoided when constructing the staircase partition wall 30.

[0043] [Another embodiment] Another embodiment of the present invention will now be described. The configurations of the respective alternative embodiments described below are not limited to being applied alone, but may also be applied in combination with the above-described embodiment or other alternative embodiments.

[0044] (1) In the above embodiment, a construction method for a staircase partitioning wall was exemplified in which a panel unit pre-assembly step was included. However, the present invention is not limited to this. For example, the method may not include the panel unit pre-assembly step, and in the panel body installation step, the horizontal support members 32 and a predetermined number of panel bodies 31 are individually lifted in a predetermined order, and then inserted into the space Sa on the upper floor where a partition wall is not installed in the order in which they were lifted, and installed in the space Sa on the lowest floor where a partition wall is not installed.

[0045] (2) In the above embodiment, the temporary handrail installation step is exemplified as a step in which the bracket 3 provided with the protruding portion 3B is used to install the temporary handrail 4 on the treads 11C, 21C of each staircase portion 11, 21, but the present invention is not limited to this. For example, the temporary handrail 4 may be installed in the partition wall installation space S using a bracket 3 not provided with the protruding portion 3B. However, in this case, it is necessary to operate each catch clamp 4A of the temporary handrail 4 described above to temporarily remove the temporary handrail 4 from each bracket 3 attached to each staircase portion 11, 21 before carrying out the panel body installation step, and to operate each catch clamp 4A to reattach the temporary handrail 4 to each bracket 3 after carrying out the panel body installation step. [Explanation of symbols]

[0046] 3 Bracket 3B Protruding part 4 Temporary handrails 5 Mounting fixture 7. Cushioning materials 10. Turning Stairs 11 Stairs section 11B Temporary handrail attachment part 11C Tread 20. Turning Stairs 21 Stairs section 21B Temporary handrail attachment part 21C Tread 30 Partition wall for stairs 30A parting wall part 31 Panel body 31B Groove 32 Support member L1: In-plane length of the panel unit L2 Distance between landings 2 PU Panel Unit S Parting wall installation space Sa space without parting wall

Claims

1. A method for constructing a partition wall for stairs, comprising the steps of: installing a plurality of panel bodies between a pair of return stairs spanning multiple floors; and constructing a partition wall for stairs that separates the pair of return stairs; An X-staircase construction step is carried out in which the pair of turn-back staircases are installed in order from the lowest floor to the other floor in an X-shape with a partition wall installation space between them to construct an X-staircase; The method for constructing a partition wall for a staircase includes a panel body installing step, in which, each time the number of partition-wall-uninstalled spaces among the partition-wall-installed spaces where no partition wall is installed reaches a predetermined number of floors by carrying out the X-staircase construction step, a predetermined number of panel bodies constituting a partition wall portion for one floor are lifted and inserted from the partition-wall-uninstalled space of the upper floor into the partition-wall-uninstalled space of the lowermost floor at that stage.

2. The inner surface of the staircase portion facing the partition wall installation space is provided with a temporary handrail mounting portion that enables the attachment of a temporary handrail via a bracket, The bracket is provided with a protruding portion that protrudes from the bracket toward the staircase portion to enable the temporary handrail to be installed on the tread surface of the staircase portion, 2. The method for constructing a staircase partition wall according to claim 1, wherein a temporary handrail installation step is carried out in which the temporary handrail is installed on the tread surface of the staircase portion using the bracket every time the X-shaped staircase is constructed in the X-shaped staircase construction step.

3. A plate-shaped buffer member is provided to cover the mounting fixture for mounting the bracket to the temporary handrail mounting portion from the outer surface side of the bracket together with the outer portion of the bracket, 3. The construction method for a staircase partition wall according to claim 2, wherein the temporary handrail installation step includes a buffer member attachment step of attaching the buffer member to an outer surface side of the bracket each time the bracket is attached to the temporary handrail mounting portion.

4. 4. The construction method for a staircase partition wall according to claim 1, further comprising a panel unit pre-assembly step of pre-assembling a predetermined number of the panel bodies constituting the partition wall portion for one floor onto a horizontal support member having grooves into which the lower ends of the panel bodies are inserted in a row and supporting the panel bodies, to construct a panel unit whose in-plane length is the same or approximately the same as the separation distance between the landings of the same floor in the pair of return staircases.

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