ATTACHMENT CONSTRUCTION METHOD OF PCa EAVES PANEL MEMBER

Abstract

To provide an attachment construction method of a PCa eaves panel member that enables a PCa eaves panel member to be easily installed at a predetermined height position of a building in a state with no supporting and no scaffold.SOLUTION: An attachment construction method of a PCa eaves panel member includes: a step of conveying a PCa eaves panel member 10 suspended by using a hitch wire member 18 to an attachment position in a skeleton structure 53a of a building 50, and engaging an upper engagement fitting 13 provided in an outer wall part panel part 11 with an engaged part 55 of the skeleton structure 53a by work from the indoor side to temporarily fix the PCa eaves panel member 10; a removal step of removing the hitch wire member 18 from a projecting distal end portion by work with an eaves panel part 12 of the temporarily fixed PCa eaves panel member 10 as a scaffold; and, after adjusting construction of the outer wall part panel part 11, fixing the upper engagement fitting 13 and a lower engagement fitting 14.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a method for installing and constructing PCa eaves panel members, and in particular to a method for installing and constructing PCa eaves panel members that enables precast concrete PCa eaves panel members that are incorporated and attached to the exterior wall portion of a building to be installed at a predetermined height without the need for shoring or scaffolding. [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 support 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 has proposed 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 of a considerable overhang length using the eaves panel portion in a more stable state.

[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 comprise 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 surrounding 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 an installation method for PCa eaves panel members that enables a PCa eaves panel member, which comprises an exterior wall panel portion and an eaves panel portion, to be easily installed at a predetermined height position of a building to be constructed without the need for shoring or scaffolding. [Means for solving the problem]

[0009] The present invention is a method for installing and constructing a PCa eave panel member, which is made of precast concrete and is to be incorporated into and attached to the exterior wall portion of a building, and which enables the member to be installed at a predetermined height without shoring or scaffolding, without using temporary shoring or temporary scaffolding erected from the ground surface. The PCa eave panel member is comprised of 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 an upper engaging hardware and a lower engaging hardware that engage with the framework structure of the building are attached to the upper and lower parts of the back side of the exterior wall panel portion opposite the eave panel portion, and the PCa eave panel member is installed using a plurality of sling wire members consisting of a pair of wire materials, one end of which is fastened to the upper end portion of the exterior wall panel portion and the other end of which is fastened to the protruding tip of the eave panel portion. The above-mentioned object has been achieved by providing a method for installing and constructing a PCa eaves panel member, which includes a temporary fixing process in which the PCa eaves panel member, which has been lifted by a heavy lifting machine, is transported to an installation position of the PCa eaves panel member in the framework structure of the building, and the upper engaging hardware provided on the upper part of the exterior wall panel member is engaged with the engaging portion of the framework structure by a worker working from inside the building, thereby temporarily fixing the PCa eaves panel member; a wire removal process in which the wire material of the sling wire member is removed from at least the protruding tip portion of the eaves panel member by a worker using the eaves panel portion of the temporarily fixed PCa eaves panel member as a foothold; and a final fixing process in which, after adjusting the erection of the exterior wall panel member, the upper engaging hardware, together with the lower engaging hardware, is engaged and fixed to the engaging portion of the framework structure.

[0010] Furthermore, in the method of installing PCa eaves panel members of the present invention, it is preferable that the lower engaging hardware is configured to include an insert hardware whose fastening position can be adjusted.

[0011] In addition, it is preferable that the installation and construction method for PCa eaves panel members of the present invention is such that the adjustment of the erection of the exterior wall panel portion in the main fixing process is carried out by workers using a workbench installed on the indoor side of the lower floor of the building as a scaffold.

[0012] Furthermore, in the installation and construction method for PCa eaves panel members of the present invention, it is preferable that the wire removal process or the main fixing process be carried out by a worker who has attached fall prevention equipment to safety equipment such as a safety fence installed on the indoor side.

[0013] Furthermore, in the installation and construction method of the PCa eave panel member of the present invention, it is preferable that the engaged portion of the frame structure, to which the upper engaging hardware attached to the exterior wall panel portion is engaged, is provided on a support bracket that is joined integrally to the frame structure so as to protrude outward.

[0014] In addition, in the installation and construction method of the PCa eaves panel member of the present invention, it is preferable that the PCa eaves panel member has an L-shaped cross-sectional shape or a T-shaped cross-sectional shape and is a panel member having a considerable length in the horizontal direction. [Effects of the Invention]

[0015] According to the installation and construction method for PCa eaves panel members of the present invention, PCa eaves panel members comprising an exterior wall panel portion and an eaves panel portion can be easily installed at a predetermined height position of the building to be constructed without any supports or scaffolding. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic cross-sectional view illustrating the state in which a PCa eaves panel member has been attached to the exterior wall portion of a building using a method for attaching and constructing a PCa eaves panel member according to a preferred embodiment of the present invention. [Figure 2] This is an oblique view of the PCa eaves panel member in a lifted state. [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] 1 is an explanatory diagram of a work process in a method for installing a PCa eave panel member according to a preferred embodiment of the present invention. [Figure 6] 1 is an explanatory diagram of a work process in a method for installing a PCa eave panel member according to a preferred embodiment of the present invention. [Figure 7] 1 is an explanatory diagram of a work process in a method for installing a PCa eave panel member according to a preferred embodiment of the present invention. [Figure 8] 1 is an explanatory diagram of a work process in a method for installing a PCa eave panel member according to a preferred embodiment of the present invention. [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 schematic cross-sectional view illustrating a scaffolding structure formed using protruding support members other than PCa eave panel members. DETAILED DESCRIPTION OF THE INVENTION

[0017] A preferred embodiment of the present invention relates to a method for installing and constructing a PCa eave panel member. This method is used, for example, when constructing a three-story building 50 as shown in Figure 1, to incorporate a PCa eave panel member 10 consisting of an exterior wall panel portion 11 and an eave panel portion 12 into the exterior wall portion 51 of the building 50, allowing it to be installed without shoring or scaffolding, and to install an eave portion consisting of the eave panel portion 12 that is arranged to protrude from the exterior wall portion 51 of the building 50.

[0018] 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.

[0019] In addition, in an embodiment, the scaffolding structure 30 described later can be assembled upward from the height 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 supports 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.

[0020] 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'.

[0021] 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 18a 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.

[0022] 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).

[0023] 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.

[0024] 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.

[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, for example, made of 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 extends 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] Furthermore, 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.

[0030] 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.

[0031] In addition, like the PCa eave panel member 10 having an L-shaped cross-sectional shape, the PCa eave panel member 10' having a T-shaped cross-sectional shape has insert hardware 63 for attaching single pipe clamps attached to the tip portion of the eave panel section 12' at multiple locations at predetermined intervals in the horizontal direction, and an angle piece 64a to which the end 18b of one wire material 18a of the sling wire member 18 is engaged is attached to the upper end portion of the exterior wall panel section 11', and an angle piece 64b to which the end 18c of the other wire material 18a of the sling wire member 18 is engaged is attached to the protruding tip portion of the eave panel section 12' at multiple locations at predetermined intervals in the horizontal direction.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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 18a 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] That is, in this embodiment, the scaffolding structure 30 using PCa eaves panel members 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 the building 50, and 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', and on the back side of the exterior wall panel portions 11, 11' opposite the eaves panel portions 12, 12', engaging hardware 13, 14 that engage with the frame structures 53a, 53b, 53c of the building 50 is attached, and on the tip portions of the eaves panel portions 12, 12', insert hardware 63 for attaching single pipe clamps is attached. 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.

[0044] 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.

[0045] 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.

[0046] In addition, in this embodiment, the scaffolding structure 30 using the PCa eaves panel member is preferably connected to the horizontal secondary single-pipe pipe 36 connected via single-pipe clamps 31 on the frame structure 53a, 53b, 53c side of the building 50 of the multiple vertical single-pipe pipes 33, via known single-pipe clamps 31, and the vertical single-pipe pipe 37 for self-weight reinforcement can be 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.

[0047] This makes it possible for the assembled scaffolding structure 30 to be supported in a more stable state by the eave panel portion 12 of the PCa eave panel member 10.

[0048] 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.

[0049] This makes it possible to carry out various tasks using the assembled scaffolding structure 30 as a scaffold more safely.

[0050] In this embodiment, instead of the above-mentioned PCa eaves panel member 10 having an L-shaped cross section and the above-mentioned PCa eaves panel member 10' having a T-shaped cross section, which is configured to include exterior wall panel portions 11, 11' arranged along the exterior wall portion of the building and eaves panel portions 12, 12' protruding laterally outward from the exterior wall panel portions 11, 11', as shown in FIG. 10, for example, various steel materials are used to form exterior wall panel portions 41, 41' arranged along the exterior wall portion of the building, and eaves panel portions 12, 12' protruding laterally outward from the exterior wall panel portions 11, 11'. By using a steel protruding support member 43 preferably having an L-shaped cross-sectional shape or a steel protruding support member 43' having a T-shaped cross-sectional shape, which is composed of protruding panel portions 42, 42' that protrude laterally outward, it is possible to form a scaffolding structure for exterior wall construction to be used when constructing the exterior walls of the upper floors of building 50 by working without shoring or scaffolding, without the need for temporary shoring or temporary scaffolding erected from the ground surface 52, as in the case of using PCa eave panel members 10, 10'.

[0051] That is, in this embodiment, the scaffolding structure 40 for constructing an exterior wall section using the overhanging support members is a scaffolding structure for constructing an exterior wall section using the overhanging support members 43, which is installed above the height position of the framework structure 53a of the ceiling part of the first floor of the building 50 without using temporary supports or temporary scaffolding erected from the ground surface, and serves as a scaffolding for work when constructing the exterior wall section of the upper floors of the building 50, and the overhanging support members 43, 43' are located between the exterior wall panel parts 41, 41' arranged on the exterior wall part 51 of the building 50 and the exterior wall panel parts 41, 41', and are positioned laterally outward from the exterior wall panel parts 41, 41'. The exterior wall panel sections 41, 41' are each composed of a protruding panel section 42, 42' that protrudes toward the rear side opposite the protruding panel sections 42, 42', and similar to the PCa eave panel members 10, 10', engaging hardware 13, 14 (see Figure 9) that engages with the frame structures 53a, 53b, 53c of the building 50 are attached to the rear side of the exterior wall panel sections 41, 41' opposite the protruding panel sections 42, 42', and known hardware for attaching single pipe clamps is attached to the tip portions of the protruding panel sections 42, 42'. The protruding support members 43, 43' 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 41, 41' with engaging portions provided on the framework structures 53a, 53b, 53c of the building 50.

[0052] In addition, in the scaffolding structure 40 for exterior wall construction using overhang support members, the tip portions of each of the overhang panel portions 42, 42' of the installed overhang support members 43, 43' are engaged with a plurality of single-pipe clamps 31 fixed to known metal fittings for attaching single-pipe clamps, so that the horizontal main single-pipe pipes 32 are attached in at least two tiers spaced apart in the vertical direction, each extending horizontally along the tip portion and fixed in place, 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 tiers, 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.

[0053] In this embodiment, the scaffolding structure 40 for exterior wall construction using overhang support members is similar to the scaffolding structure 30 using PCa eave panel members, and preferably has one or more horizontal secondary single-pipe pipes 36 extended horizontally and attached in the region between the main horizontal single-pipe pipe 32 attached to the tip portion of the overhang panel portion 42 of the overhang support member 43 on the lower floor and the main horizontal single-pipe pipe 32 attached to the tip portion of the overhang panel portion 42, 42' of the overhang support member 43, 43' on the upper floor, connected to multiple vertical single-pipe pipes 33 via well-known single-pipe clamps 31.

[0054] In addition, in this embodiment, the scaffolding structure 40 for exterior wall construction using the overhang support members preferably has the overhang panel portions 42, 42' that constitute the overhang support members 43, 43' joined together as a single unit so that they can be separated from the exterior wall panel portions 41, 41'.This allows the overhang panel portions 42, 42' to be separated and removed from the exterior wall panel portions 41, 41' when the scaffolding structure 40 for exterior wall construction is removed as temporary members that are not used as structural materials for the building 50.

[0055] Furthermore, in this embodiment, the scaffolding structure 40 for exterior wall construction using the overhang support member, similar to the scaffolding structure 30 using the PCa eave panel member, is preferably connected to the horizontal secondary single-pipe pipe 36 connected via single-pipe clamps 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 can be installed upright in the vertical direction with its lower end supported by abutting against the upper surface of the eave panel portion 12 of the PCa eave panel member 10.

[0056] Furthermore, in this embodiment, the scaffolding structure 40 for exterior wall construction using overhang support members, like the scaffolding structure 30 using PCa eave panel members, can also have a protective net 38 stretched over it to cover the side of 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, opposite the frame structure of the building 50.

[0057] The method for installing the PCa eaves panel member of the present invention is not limited to the installation method of the above-mentioned embodiment, and various modifications are possible. For example, the engaging 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 integrally fixed to the framework structure and protrudes outward. The PCa eaves panel member including the exterior wall panel portion and the eaves panel portion may have a cross-sectional shape such as an L-shape or a T-shape, or an H-shape. [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 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 40 Scaffolding structure for exterior wall construction using overhanging support members 41,41' Exterior wall panel 42,42' extension panel 43,43' Overhang support member 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 method for installing and constructing a PCa eaves panel member, which is made of precast concrete and is attached to the exterior wall of a building, can be installed at a predetermined height without using temporary supports or scaffolding erected from the ground surface, and is free of supports and scaffolding. 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 that protrudes laterally outward from the exterior wall panel portion, and an upper engaging hardware and a lower engaging hardware that engage with the frame structure of the building are attached to the upper end portion and the lower end portion, respectively, of the back side of the exterior wall panel portion opposite the eaves panel portion, a temporary fixing process in which the PCa eaves panel member is lifted by a heavy lifting machine using a plurality of sling wire members, each consisting of a pair of wire materials, one end of which is engaged with the upper end portion of the exterior wall panel portion and the other end of which is engaged with the protruding tip portion of the eaves panel portion, and the PCa eaves panel member is transported to an installation position of the PCa eaves panel member in the framework structure of the building, and the upper engaging hardware provided on the upper part of the exterior wall panel portion is engaged with the engaged portion of the framework structure by a worker working from the indoor side of the building, thereby temporarily fixing the PCa eaves panel member; a wire removal process in which a worker using the eave panel portion of the temporarily fixed PCa eave panel member as a foothold removes the wire material of the sling wire member from at least the protruding tip portion of the eave panel portion; A method for installing and constructing PCa eave panel members, which includes a final fixing process in which, after adjusting the erection of the exterior wall panel portion, the upper engaging hardware, together with the lower engaging hardware, are engaged and fixed to the engaging portion of the frame structure.

2. 2. The method for installing a PCa eave panel member according to claim 1, wherein the lower end engaging hardware includes an insert hardware whose fastening position is adjustable.

3. The method for installing and constructing a PCa eaves panel member as described in claim 2, wherein the adjustment of the erection of the exterior wall panel portion during the main fixing process is carried out by workers using a workbench installed on the indoor side of the lower floor of the building as a foothold.

4. A method for installing and constructing a PCa eaves panel member as described in claim 1 or 2, wherein the wire removal process or the final fixing process is carried out by a worker who has attached a fall prevention device to a safety facility such as a safety fence installed on the indoor side.

5. A method for installing and constructing a PCa eave panel member as described in claim 1 or 2, wherein the engaging portion of the framework structure, to which the upper engaging hardware attached to the exterior wall panel portion is engaged, is provided on a support bracket that is fixed integrally to the framework structure so as to protrude outward.

6. A method for installing and constructing a PCa eaves panel member as described in claim 1 or 2, wherein the PCa eaves panel member has an L-shaped cross-sectional shape or a T-shaped cross-sectional shape and is a panel member having a considerable length in the horizontal direction.

Images