SCAFFOLD STRUCTURE USING PCa EAVES PANEL MEMBER

Abstract

To provide a scaffold structure supported in a stable state by a PCa eaves panel member.SOLUTION: In a temporary scaffold structure using a PCa eaves panel member 10 formed of precast concrete, the PCa eaves panel member 10 includes: an outer wall part panel part 11; and an eaves panel part 12 projecting from the outer wall part panel part 11 toward a laterally outside. An engagement fitting 1 to be engaged with a building skeleton structure is attached to a back surface side. Lateral main single pipes 32 are attached to a distal end portion of the eaves panel part 12 with an interval in a vertical direction by being engaged with a plurality of single pipe clamps 31 fixed to an insert fitting 63, and a plurality of longitudinal direction single pipes 33 are attached to the lateral main single pipes 32 with an interval in the lateral direction. A plurality of scaffold brackets 34 are attached by being respectively supported by the plurality of longitudinal direction single pipe 33. Scaffold boards 35 are installed by being supported by the plurality of scaffold brackets 34.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a scaffolding structure using PCa eaves panel members, and in particular to a temporary scaffolding structure using PCa eaves panel members made of precast concrete that are incorporated and attached to the exterior wall portions of a building. [Background technology]

[0002] For example, when constructing a reinforced concrete building, eaves are sometimes provided so as to protrude from the concrete exterior wall portion. Furthermore, when forming the eaves that protrude outward from the concrete exterior wall portion as a single unit with the exterior wall portion using cast-in-place concrete, since the eaves protrude in a cantilevered manner, if the eaves need to be provided at a considerable height, such as on the exterior wall portion of an upper floor of a building, it requires a lot of work to assemble the formwork for pouring the concrete and to install shoring to support the formwork.

[0003] For this reason, a technology has been developed in which concrete eaves are manufactured in advance as precast concrete products (PCa eaves) in a factory or the like, and then the manufactured PCa eaves are joined at the building construction site so that they protrude from the concrete exterior wall portion (see, for example, Patent Document 1). In the concrete joint structure described in Patent Document 1, the base end of the PCa eaves is inserted into a joint recess formed by an upper bearing surface and a lower bearing surface, which protrudes outward from the side of a beam made of cast-in-place concrete installed in the exterior wall portion of the building, and the joint is connected. The bending moment generated in the joint recess due to the weight of the PCa eaves or an external load applied to the PCa eaves is transmitted to the beam via the bearing pressure of the upper bearing surface and the lower bearing surface of the joint recess, thereby supporting the protruding PCa eaves. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-84888 Summary of the Invention [Problem to be solved by the invention]

[0005] In the concrete joint structure described in Patent Document 1, if the overhang length of the PCa eaves is increased, the bending moment loaded on the upper and lower bearing surfaces of the joint recess will increase, making it difficult to support the PCa eaves in a stable state. Therefore, the applicant of the present application proposes a technology in which a PCa eaves panel member is manufactured as a precast concrete product with an eaves portion, preferably an exterior wall panel portion and an eaves panel portion that overhangs laterally outward from the exterior wall panel portion, for example an L-shaped or T-shaped cross-sectional shape, and at the building construction site, the exterior wall panel portion is joined to the outer end of the framework structure of the ceiling portion of the first floor and the outer end of the framework structure of the ceiling portion of any floor above this, thereby supporting the PCa eaves panel member on these framework structures, making it possible to provide an eaves portion with a considerable overhang length using the eaves panel portion in a more stable state (see Figure 1).

[0006] On the other hand, when installing eaves sections at a building construction site using PCa eaves panel components that have, for example, an L-shaped or T-shaped cross-sectional shape and that have an exterior wall panel section and an eaves panel section, if the overhang length of the eaves panel section is large, it will be necessary to support the PCa eaves panel component from below with shoring or the like during installation.However, at work sites where it is difficult to erect temporary shoring or set up temporary scaffolding from the ground surface around the building to be constructed due to relationships with adjacent various equipment structures and other installed objects, or separately ordered exterior construction work, such PCa eaves panel components will have to be installed at a specified height position on the building without shoring or scaffolding.

[0007] Furthermore, if it were possible to install a PCa eave panel component, for example one with an L-shaped or T-shaped cross-sectional shape and comprising an exterior wall panel component and an eave panel component, at a specified height of the building to be constructed without shoring or scaffolding, it would be possible to assemble temporary scaffolding for constructing the upper floors of the building using the eave panel component of the PCa eave panel component installed without shoring or scaffolding.

[0008] The present invention aims to provide a scaffolding structure that is stably supported by PCa eave panel members. [Means for solving the problem]

[0009] The present invention is a temporary scaffolding structure that uses precast concrete PCa eave panel members that are incorporated and attached to the exterior wall portion of a building, the PCa eave panel member being configured to include an exterior wall panel portion that is arranged along the exterior wall portion of the building and an eave panel portion that protrudes laterally outward from the exterior wall panel portion, and the exterior wall panel portion has an engaging hardware that engages with the framework structure of the building attached to the back side opposite the eave panel portion, and an insert hardware for attaching a single pipe clamp attached to the tip portion of the eave panel portion, and the PCa eave panel member is installed by being fixed at the height of at least two ceiling portions, the outer end of the framework structure of the first floor ceiling portion and the outer end of the framework structure of the upper floor ceiling portion that is located one or two or more stories above that, by the engaging hardware attached to the exterior wall panel portion being engaged with the engaging portion provided on the framework structure of the building, and the tip of the eave panel portion of each of the installed PCa eave panel members In this portion, the horizontal main single pipes are attached in at least two tiers spaced apart in the vertical direction, with each extending laterally along the tip portion and fixed thereto, by engaging with a plurality of single pipe clamps fixed to the insert metal fittings, and a plurality of vertical single pipes are attached upright and spaced apart in the horizontal direction by being connected via single pipe clamps to the horizontal main single pipes attached in at least two tiers, and a plurality of vertical single pipes are attached in the vertical direction, with a plurality of scaffolding brackets attached at a predetermined height position so as to protrude toward the frame structure of the building, and scaffolding boards are supported by the attached scaffolding brackets and installed in the horizontal direction at a predetermined height position in the area between the frame structure of the building and the pipe installation surface made of the horizontal main single pipes and the vertical single pipes assembled together vertically and horizontally.The above-mentioned object has been achieved by providing a scaffolding structure using PCa eave panel members.

[0010] Furthermore, in the scaffolding structure using the PCa eave panel member of the present invention, it is preferable that in the area between the main horizontal single pipe attached to the tip portion of the eave panel section of the PCa eave panel member on the lower floor and the main horizontal single pipe attached to the tip portion of the eave panel section of the PCa eave panel member on the upper floor, one or more secondary horizontal single pipes are attached, extending horizontally, and connected to multiple vertical single pipes via single pipe clamps.

[0011] Furthermore, it is preferable that the scaffolding structure using the PCa eave panel member of the present invention is installed in a vertically upright position with its lower end supported by the upper surface of the eave panel portion of the PCa eave panel member, by connecting the multiple vertical single pipes to the horizontal secondary single pipes connected via single pipe clamps on the frame structure side of the building, and the vertical single pipes for self-weight reinforcement are installed in a vertically upright position with their lower end supported by the upper surface of the eave panel portion of the PCa eave panel member.

[0012] Furthermore, it is preferable that the scaffolding structure using the PCa eave panel member of the present invention has a protective net stretched over the pipe installation surface, which is made up of a plurality of the horizontal main single-pipe pipes and a plurality of the vertical single-pipe pipes assembled together vertically and horizontally, on the side opposite the frame structure of the building. [Effects of the Invention]

[0013] According to the scaffolding structure using the PCa eave panel member of the present invention, a scaffolding structure that is stably supported by the PCa eave panel member is provided. Furthermore, if desired, the scaffolding structure can be made not to be in contact with the ground surface. [Brief explanation of the drawings]

[0014] [Figure 1] This is a schematic cross-sectional view along the vertical direction of a scaffolding structure using a PCa eave panel member according to a preferred embodiment of the present invention. [Figure 2]This is an oblique view of a PCa eaves panel member, showing the PCa eaves panel member being lifted by a wire member in a preferred installation method for PCa eaves panel members that allows for efficient construction of scaffolding structures using PCa eaves panel members. [Figure 3] A cross-sectional view of a PCa eave panel member. [Figure 4] A cross-sectional view of another PCa eave panel member. [Figure 5] FIG. 10 is an explanatory diagram of the work steps in a preferred method for installing PCa eaves panel components. [Figure 6] FIG. 10 is an explanatory diagram of the work steps in a preferred method for installing PCa eaves panel components. [Figure 7] FIG. 10 is an explanatory diagram of the work steps in a preferred method for installing PCa eaves panel components. [Figure 8] FIG. 10 is an explanatory diagram of the work steps in a preferred method for installing PCa eaves panel components. [Figure 9] FIG. 10 is an enlarged cross-sectional view illustrating the structure of the attachment portion of the PCa eave panel member to the framework structure. [Figure 10] This is a side view showing an example of a single-pipe clamp that can be used to attach a horizontal main single-pipe to the tip portion of the eave panel portion and to attach a vertical single-pipe to the horizontal main single-pipe. DETAILED DESCRIPTION OF THE INVENTION

[0015] In a scaffolding structure 30 using PCa eaves panel members according to a preferred embodiment of the present invention, a PCa eaves panel member 10' having a T-shaped cross section and a PCa eaves panel member 10 having an L-shaped cross section are used as the PCa eaves panel members. The PCa eaves panel member 10' having a T-shaped cross section is attached to a frame structure 53c in the ceiling of the third floor of the building 50, and the PCa eaves panel member 10 having an L-shaped cross section is attached to a frame structure 53a in the ceiling of the first floor of the building 50 and a frame structure 53b in the ceiling of the second floor of the building 50.

[0016] The scaffolding structure 30 using PCa eaves panel members in this embodiment is a temporary scaffolding structure using precast concrete PCa eaves panel members 10, 10' that are incorporated and attached to the exterior wall portion 51 of a building 50, as shown in Figure 1.The PCa eaves panel members 10, 10' are composed of exterior wall panel portions 11, 11' that are arranged along the exterior wall portion 51 of the building 50, and eaves panel portions 12, 12' that extend laterally outward from the exterior wall panel portions 11, 11'.In addition, on the back side of the exterior wall panel portions 11, 11' opposite the eaves panel portions 12, 12', an engaging hardware 1 that engages with the frame structures 53a, 53b, 53c of the building 50 is attached, and an insert hardware 63 for attaching a single pipe clamp is attached to the tip portion of the eaves panel portions 12, 12'. The PCa eaves panel members 10, 10' are fixed and installed at the height of at least two ceiling portions: the outer end of the framework structure 53a of the first floor ceiling portion and the outer end of the framework structures 53b, 53c of the upper floor ceiling portion located one or more floors above that, by engaging the engaging hardware 13, 14 attached to the exterior wall panel portions 11, 11' with the engaging portions provided on the building's framework structures 53a, 53b, 53c.

[0017] In addition, in a scaffolding structure 30 using PCa eave panel members, the tip portions of each eave panel section 10, 10' of the installed PCa eave panel members 10, 10' are attached to a plurality of single-pipe clamps 31 fixed to insert hardware 63, so that horizontal main single-pipe pipes 32 are attached in at least two stages (three stages in this embodiment) spaced apart in the vertical direction, each extending horizontally along the tip portion and fixed thereto, and a plurality of vertical single-pipe pipes 33 are attached upright and spaced apart in the horizontal direction by connecting them to the horizontal main single-pipe pipes 32 attached in at least two stages, one above the other, via the single-pipe clamps 31. A plurality of scaffolding brackets 34 are attached at a predetermined height position, each supported by a plurality of vertical single pipes 33, so as to protrude toward the framework structures 53a, 53b, 53c of the building 50, and a scaffolding board 35 is supported by these attached scaffolding brackets 34 and installed extending horizontally at a predetermined height position in the area between the framework structures 53a, 53b, 53c of the building 50 and the pipe installation surface made up of a plurality of horizontal main single pipes 32 and a plurality of vertical single pipes 33 assembled together vertically and horizontally.

[0018] As a result, the scaffolding structure 30 of this embodiment is stably supported by the PCa eave panel members 10, 10', and the scaffolding boards 35 can be installed at a desired height. If desired, the scaffolding structure 30 can also be placed without touching the ground surface 52.

[0019] In this embodiment, the scaffolding structure 30 using PCa eave panel members is preferably installed in the area between the main horizontal single-pipe pipe 32 attached to the tip portion of the eave panel portion 12 of the PCa eave panel member 10 on the lower floor and the main horizontal single-pipe pipe 32 attached to the tip portion of the eave panel portion 12, 12' of the PCa eave panel member 10, 10' on the upper floor, with one or more secondary horizontal single-pipe pipes 36 extended horizontally and connected to multiple vertical single-pipe pipes 33 via well-known single-pipe clamps 31.

[0020] The scaffolding structure is further stabilized by attaching the horizontal sub-pipes 36 between the horizontal main pipes 32. It also improves the flexibility of the attachment position of various items such as protective nets 38 and fall prevention devices relative to the pipe installation surface.

[0021] In addition, in this embodiment, the scaffolding structure 30 using the PCa eaves panel member is preferably connected to a horizontal secondary single-pipe pipe 36 connected via a single-pipe clamp 31 on the frame structure 53a, 53b, 53c side of the building 50 of the multiple vertical single-pipe pipes 33, via a known single-pipe clamp 31, and the vertical single-pipe pipe 37 for self-weight reinforcement is installed upright in the vertical direction with its lower end abutted against the upper surface of the eaves panel portion 12 of the PCa eaves panel member 10 and supported.

[0022] This makes it possible for the scaffolding structure 30 to be supported in a more stable state by the eave panel portion 12 of the PCa eave panel member 10.

[0023] Furthermore, in this embodiment, the scaffolding structure 30 using PCa eave panel members can also have a protective net 38 stretched over the pipe installation surface, preferably made up of multiple horizontal main single-pipe pipes 32 and multiple vertical single-pipe pipes 33 assembled together vertically and horizontally, on the side opposite the frame structure of the building 50.

[0024] This makes it possible to more safely carry out various types of work using the assembled scaffolding structure 30. Work using the scaffolding structure 30 as a scaffolding includes various exterior construction work such as installing exterior panels, painting the exterior, and repairing the exterior.

[0025] In this embodiment, the PCa eaves panel member 10 having an L-shaped cross-sectional shape that is attached to the framework structure 53a of the first floor ceiling and the framework structure 53b of the second floor ceiling of the building 50 is manufactured in advance as a precast concrete product in a factory or the like, as shown in Figure 3, and has an L-shaped cross-sectional shape consisting of an exterior wall panel portion 11 having a vertically elongated rectangular cross-sectional shape with a height of approximately 805 mm and a thickness of approximately 180 mm, and an eaves panel portion 12 having a horizontally elongated rectangular cross-sectional shape with a width of approximately 655 mm and a thickness of approximately 155 mm, which is formed as a single unit by bending vertically horizontally from the lower end portion of the exterior wall panel portion 11. The PCa eave panel member 10 is formed horizontally with an extension of, for example, approximately 3 to 10 m (see Figure 2), and a plurality of upper engaging hardware 13 and lower engaging hardware 14 are fixed and attached as a single unit to the upper and lower parts of the back side of the exterior wall panel part 11, opposite the eave panel part 12, at predetermined intervals in the horizontal direction.

[0026] The upper engaging hardware 13 is a hardware member formed by integrally joining an anchor plate 13c equipped with an anchor rod 13b to the outer peripheral surface of an angle piece 13a made of, for example, angle iron. When manufacturing the PCa eave panel member 10, the embedded base of the anchor plate 13c is embedded in concrete together with the anchor rod 13b, so that one side of the L-shaped cross-sectional angle piece 13a is aligned with the rear surface of the exterior wall panel 11, and the other side projects laterally perpendicularly from the rear surface, thereby firmly fixing the angle piece 13a to the upper rear surface of the exterior wall panel 11. A bolt fastening hole is formed in the other side of the angle piece 13a, and a male threaded bolt 61 of a connecting hardware 60 attached as a fastening part 55 to the framework structure 53a of the first floor ceiling is fastened to this bolt fastening hole (see Figure 9).

[0027] The lower engaging hardware 14 is an insert hardware with a female threaded hole on the inside, and like the upper engaging hardware 13, it is embedded in concrete when manufacturing the PCa eave panel member 10, so that it is fixed integrally to the lower back side of the exterior wall panel member 11 with the open end face of the female threaded hole facing the back side of the exterior wall panel member 11. A male threaded bolt member 62 (see Figure 9) whose fastening position relative to the framework structure 53a of the first floor ceiling is screwed into the lower engaging hardware 14.

[0028] Furthermore, in this embodiment, in order to enable the assembly of the scaffolding structure 30 described below, insert hardware 63 for attaching single pipe clamps is attached to the tip portion of the eave panel portion 12 of the PCa eaves panel member 10 at multiple locations at predetermined intervals in the horizontal direction of the PCa eaves panel member 10. The insert hardware 63 for attaching single pipe clamps is also embedded in concrete when manufacturing the PCa eaves panel member 10, so that it is fixed integrally to the eaves panel portion 12 with the open end face of the female screw hole facing the tip portion of the eaves panel portion 12 (see Figure 2).

[0029] The PCa eaves panel member 10' having a T-shaped cross-section and attached to the framework structure 53c of the third floor ceiling of the building 50 is similarly manufactured in advance as a precast concrete product in a factory or the like, as shown in Figure 4, and has a T-shaped cross-section consisting of an exterior wall panel portion 11' having a vertically elongated rectangular cross-section with a height of approximately 655 mm and a thickness of approximately 180 mm, and an eaves panel portion 12' having a horizontally elongated rectangular cross-section with a width of approximately 470 mm and a thickness of approximately 155 mm, which is formed integrally with and extends vertically from the middle part of the exterior wall panel portion 11'. The PCa eaves panel member 10' is also formed horizontally with an extension of, for example, approximately 3 to 10 m (see Figure 2), and like the PCa eaves panel member 10 having an L-shaped cross-sectional shape, a plurality of upper engaging hardware 13 and lower engaging hardware 14 are fixed and attached as a single unit to the upper and lower parts of the back side of the exterior wall panel portion 11', opposite the eaves panel portion 12', at predetermined intervals in the horizontal direction.

[0030] In addition, in the PCa eaves panel member 10' having a T-shaped cross-sectional shape, similar to the PCa eaves panel member 10 having an L-shaped cross-sectional shape, insert hardware 63 for attaching a single pipe clamp is attached at multiple locations at a predetermined interval in the horizontal direction at the tip portion of the eaves panel portion 12'.

[0031] On the other hand, in this embodiment, as shown in FIG. 9, a connecting metal fitting 60 is attached to the framework structure 53a of the first floor ceiling as a locking portion 55 that locks and joins the upper engaging metal fitting 13 provided on the PCa eave panel member 10. In this embodiment, a perimeter beam 65 made of, for example, H-shaped steel is provided along the outer perimeter edge of the framework structure 53a of the first floor ceiling, and a support bracket 66 is attached by being joined to the perimeter beam 65 by welding or the like so as to protrude outward and fixed as a single unit. The connecting metal fitting 60 is attached by being fixed to the upper surface plate portion 66a of the support bracket 66 in the portion protruding from the perimeter beam 65, with the male threaded bolt portion 61 extending upright from the upper surface plate portion 66a. With the male threaded bolt portion 61 inserted into a bolt fastening hole formed on the other side of the angle piece 13a of the upper engaging hardware 13 of the PCa eaves panel member 10, the other side is sandwiched between the pair of nut members 61a threaded onto the top and bottom of it, and the angle piece 13a is fastened at a predetermined height. This makes it possible to firmly fix the PCa eaves panel member 10 via the angle piece 13a and the upper engaging hardware 13 to the framework structure 53a of the first floor ceiling at a predetermined height.

[0032] In this embodiment, a side plate portion 66b is attached to the protruding tip portion of the support bracket 66, and a bolt insertion and fastening hole is formed in this side plate portion 66b at a position corresponding to the lower engaging hardware 14 formed by the insert hardware of the PCa eaves panel member 10. A male threaded bolt member 62 is inserted into this bolt insertion and fastening hole, and the tip of the male threaded bolt member 62 is screwed into the lower engaging hardware 14 formed by the insert hardware of the PCa eaves panel member 10. With the male threaded bolt member 62 inserted into the bolt insertion and fastening hole, the side plate portion 66b is sandwiched between the pair of nut members 62a threaded on the left and right sides thereof, and the side plate portion 66b can be fastened to a predetermined lateral position on the male threaded bolt member 62. This makes it possible to fix the PCa eave panel member 10 to the framework structure 53a while adjusting the erection of the exterior wall panel portion 11 by adjusting the distance from the framework structure 53a of the first floor ceiling portion via the male thread bolt member 62 and the lower engaging hardware 14 made of insert hardware.

[0033] As examples of the single-pipe clamp 31 for attaching the horizontal main pipe 32 to the tip of the eave panel 12, 12' and the single-pipe clamp 31 for attaching the vertical single-pipe 33 to the horizontal main pipe 32, for example, a single-pipe clamp 31A shown in FIG. 10 can be used, which has a clamp body 31c with a first fixing portion 31a that is attached to the horizontal main pipe 32 and a second fixing portion 31b that is attached to the vertical single-pipe 33, and a bolt portion 31d that is threaded into an insert metal fitting 63. In the single-pipe clamp 31A, the clamp body 31c has a configuration similar to that of known single-pipe clamps. In the single-pipe clamp 31A, the bolt portion 31d may be integrally fixed to the clamp body 31c by welding or the like. In this case, for example, the bolt portion 31d can be threaded into the female threaded hole of the insert hardware 63 by rotating the entire clamp body 31c, or by rotating the first fixing portion 31a to which the bolt portion 31d is fixed if the first fixing portion 31a and the second fixing portion 31b are rotatably connected. The bolt portion 31d may be attached to the clamp body 31c so as to be rotatable about its axis independently of the clamp body 31c. In this case, the bolt portion 31d can be threaded into the female threaded hole of the insert hardware 63 by rotating only the bolt portion 31d. To facilitate the rotation operation for threading the bolt portion 31d, a portion having a non-circular cross section, such as a hexagonal or rectangular cross section, may be provided at the base end or the like of the bolt portion 31d, and this portion may be rotated using a wrench, an automatic rotation device, or the like.

[0034] We will now explain a preferred installation and construction method for the PCa eaves panel members that allows for efficient construction of a scaffolding structure using the PCa eaves panel members of this embodiment. A preferred embodiment of the present invention relates to a method for installing and constructing a PCa eave panel member. When constructing a three-story building 50, such as that shown in Figure 1, the PCa eave panel member 10, consisting of an exterior wall panel portion 11 and an eave panel portion 12, is incorporated into the exterior wall portion 51 of the building 50, allowing it to be installed without shoring or scaffolding, and is used as a construction method for installing an eave portion made of the eave panel portion 12 that is arranged to protrude from the exterior wall portion 51 of the building 50.

[0035] In other words, in this embodiment, when installing the exterior wall panel section 11 of the three-story building 50, it is difficult to erect temporary shoring to support it from below from the surrounding ground surface 52 or to install temporary scaffolding on the surrounding ground surface 52 due to its relationship with various adjacent equipment structures and other installed objects, and with separately ordered exterior construction work, etc., so a construction method is adopted that enables the PCa eaves panel member 10 to be easily installed at a specified height position of the building 50 to be constructed by work without shoring or scaffolding, which does not require these temporary shoring or scaffolding.

[0036] In addition, in an embodiment, the scaffolding structure 30 is assembled upward from the height position of the framework structure 53a of the first floor ceiling of the building 50 using the PCa eaves panel member 10 attached to the exterior wall portion 51 of the building 50 by the installation and construction method of the PCa eaves panel member, without installing temporary shoring or temporary scaffolding erected from the ground surface 52, and can be used as scaffolding, for example, when constructing the exterior walls of the upper floors of the building 50.

[0037] The installation method for PCa eaves panel members in this embodiment is an installation method that allows precast concrete PCa eaves panel members 10, 10' to be incorporated and attached to the exterior wall portion 51 of a building 50 to be installed at a predetermined height without the use of temporary shoring or temporary scaffolding erected from the ground surface 52, and as shown in Figures 2 to 4, the PCa eaves panel members 10, 10' are composed of exterior wall panel portions 11, 11' arranged along the exterior wall portion 51 of the building 50, and eaves panel portions 12, 12' that extend laterally outward from the exterior wall panel portions 11, 11', and upper and lower engaging hardware 13 and lower engaging hardware 14 that engage with the building's frame structures 53a, 53b, 53c are respectively attached to the upper and lower back side of the exterior wall panel portions 11, 11' opposite the eaves panel portions 12, 12'.

[0038] As shown in Figures 5 to 8, which illustrate a PCa eaves panel member 10 having an L-shaped cross section that is to be placed at the height of a framework structure 53a of the first floor ceiling of a three-story building 50, the method for installing and constructing a PCa eaves panel member of this embodiment involves using a plurality of sling wire members 18, each consisting of a pair of wire members 18a, one end 18b of which is fastened to the upper end portion of the exterior wall panel portion 11 and the other end 18c of which is fastened to the protruding tip portion of the eaves panel portion 12, to transport the PCa eaves panel member 10 (see Figure 2) that has been lifted by a heavy lifting machine to an installation position of the PCa eaves panel member 10 in the framework structure 53a of the building 50, and then fastening the PCa eaves panel member 10 to the framework structure 53a of the building 50. The process includes a temporary fixing process (see Figures 5 and 6) in which a worker from the indoor side of the building 50 engages the upper engaging hardware 13 provided at the top with the engaging portion 55 of the frame structure 53a to temporarily fix the PCa eave panel member 10; a wire removal process (see Figure 7) in which a worker using the eave panel portion 12 of the temporarily fixed PCa eave panel member 10 as a foothold removes the wire material 18c of the sling wire member 18 from at least the protruding tip portion of the eave panel portion 12; and a final fixing process (see Figure 8) in which, after adjusting the erection of the exterior wall panel portion 11, the upper engaging hardware 13, together with the lower engaging hardware 14, are engaged and fixed with the engaging portion 55 of the frame structure 50a.

[0039] In addition, in this embodiment, adjustment of the erection of the exterior wall panel portion 11 in this fixing process is preferably carried out by workers using a work platform 54 installed on the indoor side of the lower floor (first floor) of the building 50 as a scaffold (see Figure 8).

[0040] Furthermore, in this embodiment, the wire removal process or the final fixing process is preferably carried out by a worker who has attached a fall arrest device 58 to a safety facility 57, such as a safety fence, installed inside the building.

[0041] In this embodiment, for example, a PCa eaves panel member 10 having an L-shaped cross-sectional shape that is attached to the frame structure 53b of the second floor ceiling of a three-story building 50, or a PCa eaves panel member 10' having a T-shaped cross-sectional shape that is attached to the frame structure 53c of the third floor ceiling, can be supported by the frame structure 53b of the second floor ceiling or the frame structure 53c of the third floor ceiling and attached as a single unit to them by performing the same operations as for the PCa eaves panel member 10 having an L-shaped cross-sectional shape that is attached to the frame structure 53a of the second floor ceiling.

[0042] In this embodiment, angle pieces 64a, made of, for example, angle irons and having locking holes, to which end 18b of one wire 18a of the sling wire member 18 is locked, are attached at multiple locations at predetermined intervals in the horizontal direction to the upper end portion of the exterior wall panel 11. Angle pieces 64b, made of, for example, angle irons and having locking holes, to which end 18c of the other wire 18a of the sling wire member 18 is locked, are attached at multiple locations at predetermined intervals in the horizontal direction to the protruding tip portion of the eaves panel 12.

[0043] In addition, an angle piece 64a to which end 18b of one wire material 18a of the sling wire member 18 is attached is attached at multiple locations at a predetermined interval in the horizontal direction to the upper end portion of the exterior wall panel portion 11', and an angle piece 64b to which end 18c of the other wire material 18a of the sling wire member 18 is attached is attached at the protruding tip portion of the eaves panel portion 12'.

[0044] In order to support and attach a PCa eave panel member 10 made of precast concrete to, for example, a framework structure 53a of the first floor ceiling of a building 50 using the installation method for PCa eave panel members of this embodiment, in the temporary fixing process, as shown in Figures 5 and 6, multiple sling wire members 18 made of a pair of wire materials 18a, one end 18b of which is engaged with the upper end portion of the exterior wall panel portion 11 and the other end 18c of which is engaged with the protruding tip portion of the eave panel portion 12, are used to transport the PCa eave panel member 10 (see Figure 2) lifted by a lifting machine to the installation position of the PCa eave panel member 10 in the framework structure 53a of the building 50, and then, by work by a worker from the indoor side of the building 50, the PCa eave panel member 10 is temporarily fixed to the framework structure 53a via the engaged portion 55 of the upper engaging hardware 13 and the connecting hardware 60 of the framework structure 53a, as described above.

[0045] Thereafter, in the wire removal process, as shown in Figure 7, a worker using the eaves panel portion 12 of the temporarily fixed PCa eaves panel member 10 as a foothold removes the wire material 18c of the sling wire member 18 from at least the protruding tip portion 12a of the eaves panel portion 12. When using the eaves panel portion 12 as a foothold, the worker can safely perform the work by fastening a fall arrest device 58 to a safety facility 57, such as a safety fence, preferably installed on the indoor side.

[0046] Furthermore, in this fixing process, as shown in Figure 8, a worker using a workbench 54, preferably installed on the indoor side of the lower floor (first floor) of the building 50, as a scaffolding, adjusts the erection of the outer wall panel portion 11 of the temporarily fixed PCa eaves panel member 10 via the above-mentioned male threaded bolt member 62 and the lower engaging hardware 14 made of insert hardware, and then fixes the upper engaging hardware 13 together with the lower engaging hardware 14 to the frame structure 50a by tightening the nut members 61a and 62a, thereby joining the PCa eaves panel member 10 as a single unit while firmly supporting it to the frame structure 50a, making it possible to install the eaves portion made of the eaves panel portion 12 in a stable state.

[0047] As a result, according to the installation and construction method for PCa eaves panel members of this embodiment, it is possible to easily install a PCa eaves panel member 10 comprising an exterior wall panel portion 11 and an eaves panel portion 12 at a predetermined height position of the building 50 to be constructed without any supports or scaffolding.

[0048] In this embodiment, as described above, a PCa eave panel member 10 having an L-shaped cross-section, for example, comprising an exterior wall panel portion 11 and an eave panel portion 12, is installed at a predetermined height position of a building 50 to be constructed without shoring or scaffolding. Insert metal fittings 63 for attaching single pipe clamps are attached to the tip portion of the eave panel portion 12 at multiple locations at predetermined intervals in the horizontal direction of the PCa eave panel member 10.Therefore, as shown in Figure 1, by using the eave panel portion 12 of such a PCa eave panel member 10 installed without shoring or scaffolding, it is possible to assemble temporary scaffolding for constructing the upper floors of the building 50 without erecting temporary shoring or the like from the ground surface 52.

[0049] In other words, in this embodiment, the PCa eaves panel members 10, 10' are fixed and installed at at least two ceiling height positions: the outer end of the framework structure 53a of the first floor ceiling and the outer end of the framework structures 53b, 53c of the upper floor ceiling of the second or third floor, which is located one or two floors above that, by engaging the upper engaging hardware 13 attached to the exterior wall panel portion with the engaging portions 55 provided on the framework structures 53a, 53b, 53c of the building 50, and insert hardware 63 for attaching single pipe clamps is attached to the tip portions of the eaves panel portions 12, 12' of these PCa eaves panel members 10, 10', respectively.

[0050] As a result, in this embodiment, by engaging a plurality of known single-pipe clamps 31 fixed to insert hardware 63 with the tip portions of the eave panel sections 12, 12' of each of the installed PCa eave panel members 10, 10', the horizontal main single-pipe pipes 32 can be installed in at least two tiers spaced apart in the vertical direction, with each tier extending horizontally along the tip portions and fixed in place.

[0051] Furthermore, by connecting multiple vertical single pipes 33 to the horizontal main single pipes 32 attached at least in two upper and lower tiers via known single pipe clamps 31, multiple vertical single pipes 33 can be attached upright at intervals in the horizontal direction, and multiple scaffolding brackets 34 can be attached at a predetermined height position, each supported by the multiple vertical single pipes 33, so that they extend toward the frame structures 53a, 53b, 53c of the building 50.

[0052] Furthermore, by supporting scaffolding boards 35 on these attached scaffolding brackets 34 and installing them horizontally at a predetermined height in the area between the building's frame structure 53a, 53b, 53c and the pipe installation surface made up of multiple horizontal main single-pipe pipes 32 and multiple vertical single-pipe pipes 33 assembled together vertically and horizontally, a scaffolding structure 30 can be formed using PCa eave panel members.

[0053] The scaffolding bracket 34 can be any one that can be fixed to the vertical single-tube pipe 33, and can be, for example, one that includes a board receiving portion of a scaffolding board 35 that has an engaging portion that can be engaged and disengaged with the vertical single-tube pipe 33, and a support portion that supports the board receiving portion from below. The scaffolding bracket 34 may be one that can be fixed to the vertical single-tube pipe 33 by engaging with an engaging portion such as an opening directly provided in the vertical single-tube pipe 33, or one that can be fixed to the vertical single-tube pipe 33 by engaging with an engaging portion fixed to the vertical single-tube pipe 33 by welding or the like.

[0054] In addition, in this embodiment, adjustment of the erection of the exterior wall panel portion 11 in this fixing process is preferably carried out by workers using a work platform 54 installed on the indoor side of the lower floor (first floor) of the building 50 as a scaffold (see Figure 8).

[0055] The scaffolding structure of the PCa eaves panel member of the present invention is not limited to the above-mentioned embodiment and can be variously modified. Furthermore, the method of constructing the scaffolding structure using the PCa eaves panel member is not limited to the above-mentioned method of installing the PCa eaves panel member and can be variously modified. For example, the method of transporting the PCa eave panel member to an installation position at a predetermined height does not have to be a method of lifting it with heavy lifting equipment using the sling wire member 18. Furthermore, instead of fixing the single pipe clamp 31 to the insert hardware 63 via the bolt portion 31d provided directly on the single pipe clamp 31, the bolt portion 31d of a connecting hardware having a connection portion and bolt portion 31d for the single pipe clamp 31 may be screwed into the insert hardware 63, and the single pipe clamp 31 may be fixed indirectly via the connecting hardware.

[0056] Furthermore, the engaged portion of the framework structure to which the upper engaging hardware attached to the exterior wall panel portion is engaged does not necessarily have to be provided on a support bracket that is fixed integrally to the framework structure so as to protrude outward. The PCa eave panel member including the exterior wall panel portion and the eave panel portion may have a cross-sectional shape such as an L-shape or T-shape, or an H-shape, etc.

[0057] In addition, as the single pipe clamp 31 that connects the horizontal secondary single pipe 36 to the vertical single pipe 33, and the single pipe clamp 31 that connects the horizontal secondary single pipe 36 to the vertical single pipe 37 for self-weight support reinforcement, a known single pipe clamp 31 that does not have a bolt portion 31d can be used. In addition, the work of fixing the single-pipe clamp 31 to the tip portion of the eave panel portion 12, 12' via the insert metal fittings 63 and the work of attaching the horizontal secondary single-pipe pipe 36 via the fixed single-pipe clamp 31 may be performed in whole or in part by workers using the eave panel portion 12, 12' of the PCa eave panel member installed in the temporary fixing process or the main fixing process as a foothold. [Explanation of symbols]

[0058] 10,10' PCa eaves panel member 11,11' exterior wall panel 12,12' Eaves panel section 13 Upper engagement hardware 13a Angle piece 13b Anchor rod 13c anchor plate 14 Lower engagement hardware 18 Sling wire material 18a wire material 18b One end 18c Other end 30 Scaffolding structure using PCa eaves panel members 31 Single pipe clamp 31A Single pipe clamp with bolt 32 Horizontal main single pipe 33 Vertical single pipe 34 Scaffolding bracket 35 Scaffolding Plank 36 Horizontal secondary single pipe 37 Vertical single pipe for weight support reinforcement 38 Protective Net 50 Buildings 51 External wall part 52 Ground surface 53a First floor ceiling frame structure 53b Second floor ceiling frame structure 53c 3rd floor ceiling frame structure 54 Workbench 55 Locked part 57 Safety equipment 58 Fall arrest equipment 60 Metal joints 61a Nut member 61 Male thread bolt part 62 Male thread bolt component 62a Nut member 63 Insert metal fitting for single pipe clamp installation 64a, 64b Angle piece 65 Perimeter beam 66 Support bracket

Claims

1. A temporary scaffolding structure using precast concrete PCa eaves panel members that can be incorporated into and attached to the exterior wall of a building. The PCa eaves panel member is configured to include an exterior wall panel portion arranged along the exterior wall portion of the building, and an eaves panel portion extending laterally outward from the exterior wall panel portion, and an engaging hardware that engages with the building's framework structure is attached to the back side of the exterior wall panel portion opposite the eaves panel portion, and an insert hardware for attaching a single pipe clamp is attached to the tip portion of the eaves panel portion, The PCa eaves panel member is fixed and installed at the height of at least two ceiling portions, namely, the outer end of the framework structure of the first floor ceiling portion and the outer end of the framework structure of the upper floor ceiling portion located one or more floors above, by engaging the engaging hardware attached to the exterior wall panel portion with the engaging portion provided on the framework structure of the building, The end portions of the eaves panel sections of each of the installed PCa eaves panel members are engaged with a plurality of single-pipe clamps fixed to the insert metal fittings, so that horizontal main single-pipe pipes are attached in at least two stages spaced apart in the vertical direction, each extending horizontally along the end portions and fixed thereto; A plurality of vertical single pipes are attached in an upright position at intervals in the horizontal direction by being connected to the horizontal main single pipes attached in at least two tiers, upper and lower, via single pipe clamps; a plurality of scaffolding brackets are attached to the plurality of vertical single pipes at predetermined heights so as to project toward the framework of the building; A scaffolding structure using PCa eave panel members, in which scaffolding boards are supported by the attached scaffolding brackets and installed extending horizontally at a predetermined height in the area between the building's framework structure and the pipe installation surface made up of a plurality of horizontal main single-pipe pipes and a plurality of vertical single-pipe pipes assembled together vertically and horizontally.

2. A scaffolding structure using a PCa eave panel member as described in claim 1, wherein in the area between the main horizontal single pipe attached to the tip portion of the eave panel section of the PCa eave panel member on the lower floor and the main horizontal single pipe attached to the tip portion of the eave panel section of the PCa eave panel member on the upper floor, one or more secondary horizontal single pipes are attached extending horizontally and connected to multiple vertical single pipes via single pipe clamps.

3. A scaffolding structure using a PCa eave panel member as described in claim 2, wherein the vertical single pipes for self-weight reinforcement are connected to the horizontal secondary single pipes connected via single pipe clamps on the frame structure side of the building of the multiple vertical single pipes via single pipe clamps, and the vertical single pipes for self-weight reinforcement are installed upright in the vertical direction with their lower ends abutted against the upper surface of the eave panel portion of the PCa eave panel member and supported.

4. A scaffolding structure using PCa eave panel members as described in claim 1 or 2, wherein a protective net is stretched to cover the pipe installation surface, opposite the building frame structure, of the multiple horizontal main single-pipe pipes and multiple vertical single-pipe pipes assembled together vertically and horizontally.

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