JP7547240B2 - Eaves structure and construction method of eaves structure - Google Patents

Description

This disclosure relates to eaves structures and construction methods for eaves structures.

Conventionally, there has been known an eaves structure that improves the appearance quality of roofs, such as flat roofs, by providing a decorative material called an eaves parapet on the outside of the roof (see, for example, Patent Document 1).

This conventional eaves structure is applied to unit buildings, and the eaves parapet comprises multiple arms protruding at intervals from the building unit along the eaves, reinforcing brackets attached to the tip of each arm, and a parapet body whose underside is supported by these reinforcing brackets. Note that the eaves structure described in Patent Document 1 is a structure for the eaves on the underwater side of the roof, and has arms provided to ensure spacing for the installation of eaves gutters, but for the eaves on the abovewater side, the reinforcing brackets are fixed directly to the roof beams. Also, the parapet body is divided into multiple parts to accommodate dimensional errors and for ventilation.

Because the parapet is installed along the eaves that span multiple building units, the factory-manufactured building units are installed at the construction site, and workers then assemble them on-site. In other words, during construction, the arms and reinforcing brackets are fixed to the roof beams, and then the parapet, which is made up of multiple parts, is attached to the eaves of the building units.

JP 2018-100591 A

However, in the above-mentioned conventional technology, the eaves parapet is assembled at the building construction site, which requires a lot of on-site work and does not fully utilize the advantages of a unit building. In addition, in the conventional technology, the members for attaching reinforcing brackets such as arms are fastened from the inside of the roof beams of the building unit, so the parapet installation work must be done before the roof panel is placed on top of the building unit, and it is also susceptible to the effects of weather, limiting the flexibility of construction.

This disclosure was made with a focus on the above-mentioned conventional problems, and aims to provide an eaves structure and a construction method thereof that can improve the workability of the eaves structure and increase the degree of freedom in construction.

The eaves structure of the present disclosure is an eaves structure in which an eave parapet is attached to the upper outer surface of a building.
The eaves parapet comprises a plate-shaped parapet body forming the outer surface of the eaves parapet, and a parapet reinforcement member supporting the rear surface of the parapet body and fixed to the roof beam of the building using a fastening member. The fastening member comprises a bolt fixed to the roof beam by a bolt fixing means in a state protruding from the roof beam to the outside of the building, and a nut that can be tightened to the bolt. The parapet reinforcement member is fixed to the roof beam by tightening the nut to the bolt inserted into a bolt insertion hole formed in the parapet reinforcement member.
The bolt fixing means includes a bolt fixing bracket having a screw hole into which the bolt can be fastened,
The bolt is inserted through the roof beam from the inside of the building and screwed into the threaded hole in the bolt fixing bracket which is abutted against the outer surface of the roof beam, and the bolt is fixed to the roof beam with the roof beam sandwiched between the bolt fixing bracket and the bolt head.

In addition, in the construction method for the eaves structure disclosed herein, the parapet body is provided with a retrofit member that can open a working space for fastening the nut when removed from the parapet body. Then, in a factory, the following steps are performed: fixing the bolt to the roof beam with the bolt fixing means; and assembling a subassembly by pre-assembling the parapet body members excluding the retrofit member and the parapet reinforcement member. Also, at a construction site, the following steps are performed: assembling the subassembly to the roof beam so that the bolt is inserted into the bolt insertion hole of the parapet reinforcement member, fastening the nut to the bolt to fix the subassembly to the roof beam, and assembling the retrofit member to the subassembly.

In the eaves structure disclosed herein, the parapet reinforcement member supporting the parapet body is fixed by tightening a nut to the bolt protruding from the roof beam to the outside of the building. Therefore, the parapet body can be attached even after the roof is installed on the building, and the timing of attachment to the roof beam is not easily restricted by the timing of roof installation or weather, improving the flexibility of construction. In addition, since the bolt is fixed to the roof beam by the bolt fixing means, the bolt does not move relative to the roof beam when the nut is tightened from the outside of the building, and construction is excellent.
When fixing the bolt to the roof beam, it is only necessary to rotate the bolt and fix it in the screw hole, which is easier and more efficient than fixing by welding. Also, two bolts can be fixed with one bolt fixing bracket, which reduces the number of parts compared to fastening parts such as nuts to each bolt.

In the construction method for eaves structures disclosed herein, the bolts are fixed to the roof beams and the subassembly is assembled in advance at the factory, and the construction site involves two steps: fixing the subassembly to the roof beams and assembling retrofit components to the subassembly fixed to the roof beams. This improves workability compared to the case where the parapet reinforcement is fixed to the roof beams and then the individual parts that make up the parapet body are attached.

A cross-sectional view showing the eaves structure of embodiment 1. 1 is a schematic plan view showing an outline of a unit building to which the eaves structure of embodiment 1 is applied. FIG. FIG. 2 is an oblique view showing the main parts of the eaves structure of embodiment 1, where (a) is an oblique view showing the roof beam on the girder side, and (b) is an oblique view showing the roof beam on the gable side. 1A and 1B are oblique views showing the main parts of the eaves structure of embodiment 1, where (a) is an oblique view of a first bolt fixing bracket, and (b) is an oblique view of a second bolt fixing bracket. This is an oblique view explaining a construction method of the eaves structure of embodiment 1.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
(Embodiment 1)
The eaves structure of this embodiment 1 and a construction method for this eaves structure will be described.
(Description of buildings and roofs that use eaves construction)
The eaves structure of the first embodiment is applied to the eaves portion of the roof L shown in Figure 1.

First, the structure of the building H having the roof L will be briefly described.
The building H is a unit building composed of building units U, that is, the building units U are manufactured in advance in a factory, transported to a construction site, and assembled there, so that the building H can be constructed within a short period of time.

This building unit U is made of steel and has a unit frame UF of a box-frame structure in which the upper ends of four columns 11 (see Figure 3) are connected by four beams (ceiling beams (not shown) and roof beams 10 in Figure 1) in a rectangular shape when viewed from above, and the lower ends of the columns 11 are connected by four floor beams (not shown) in a rectangular shape when viewed from above.

As shown in Figure 3, the pillar 11 is formed in a rectangular tube shape. As shown in Figure 1, the roof beam 10 is made of a U-shaped steel plate with an upper flange 10b and a lower flange 10c on the top and bottom of the web 10a. Note that the roof beam 10 (ke) shown in Figure 3(a) is arranged on the unit girder side ke (see Figure 2), and the roof beam 10 (tu) shown in Figure 3(b) is arranged on the unit gable side tu (see Figure 2). In the explanation of the roof beam 10 that is common to both the girder side and the gable side, the notations (ke) and (tu) are omitted.

The pillar 11 and roof beam 10 are joined by welding or the like with the roof beam 10 inserted into a cylindrical joint piece 12 connected to the upper end of the pillar 11.

Building H is constructed by arranging building units U as shown in Figure 2. Note that the dotted line Ee indicates the position of the tip of the eaves, and building H has a wide eaves portion that protrudes significantly from the exterior wall WO (see Figure 1) and a short eaves portion that protrudes only slightly from the exterior wall WO.

The roof L is a flat roof known as a flat roof, but for drainage purposes, a water gradient is provided that descends in the direction of the arrow WG in Figure 2.

The eaves structure of the first embodiment shown in Figure 1 is applied to the unit girder side ke on the above-water side of the water gradient of the roof L, and Figure 1 shows a cross section at the position of line S1-S1 in Figure 2. The eaves structure of the first embodiment can also be applied to the eaves of the unit gable side tu. In addition, an eaves gutter (not shown) (see Patent Document 1) is provided at the eaves on the below-water side of the water gradient, and as this is different from the eaves structure of the first embodiment, a description will be omitted.

Here, to briefly explain the structure of the roof L, the roof L is composed of multiple roof panels 20 arranged side by side on top of the unit frame UF.

The roof panel 20 comprises a pair of roof frames 21, a sheathing board 22, and a base steel plate 23.
The pair of roof frames 21 are formed from U-shaped steel plates, each fixed at both ends to a roof beam 10 (ke) that constitutes the unit frame UF by bolts 21a and nuts 21b, and arranged at a distance from each other in the direction along the roof beam 10 (ke).

The sheathing boards 22 are wooden boards, and both ends are supported by sheathing board supports 22a that are installed along the roof frame 21. The top surface of the sheathing boards 22 is covered with a waterproof sheet 24.

The base steel plate 23 is made of a metal plate such as hot-dip aluminized steel plate, which has excellent waterproof and corrosion resistance properties, and is placed on top of a waterproof sheet 24 and supported by the sheathing boards 22 and roof frame 21. The edges of the base steel plate 23 are raised, and the raised parts of the base steel plate 23 between adjacent roof panels 20 are covered by vertical covers 25 to ensure watertightness.

The above-water end of the base steel plate 23 is provided with an above-water drain 23a that extends outward beyond the sheathing board 22 and is bent downward. A stepped above-water steel plate 26 is provided above the above-water edge of the base steel plate 23, with a ventilation gap LV between it and the base steel plate 23. The above-water steel plate 26 is supported by above-water steel plate support brackets 26a. A solar cell module SCM is installed on the roof panel 20, spaced above the base steel plate 23.

(Explanation of eaves structure)
Next, the eaves structure of embodiment 1 will be described in detail.
This eaves structure is a structure in which the outer side of the roof L is covered by the eaves parapet P shown in Figure 1. The eaves parapet P includes a parapet body 30, a parapet reinforcement member 40, and a bolt fixing member 50.

The parapet body 30 is a plate-like member that covers the outside of the roof L, and is divided into a parapet upper member (retrofit member) 31, a parapet middle member 32, and a parapet lower member 33. The parapet reinforcement member 40 reinforces and supports the parapet body 30. The bolt fixing member 50 fixes the parapet reinforcement member 40, which supports the parapet body 30, to the roof beam 10.

(Explanation of bolt fixing parts)
First, a description will be given of the bolt fixing members 50. As shown in Fig. 3, a plurality of bolt fixing members 50 are installed at intervals on the roof beam 10, and each bolt fixing member 50 includes a first bolt 51, a second bolt 52, a first bolt fixing bracket 53, and a second bolt fixing bracket 54.

The first bolt fixing bracket 53 is used to fix the bolt 51 to the middle of the roof beam 10, and is formed from a metal plate in a vertically long rectangular shape as shown in FIG. 4(a), and has threaded holes 531, 531 on the inner periphery, spaced apart vertically, into which the bolt 51 can be fastened. The vertical spacing of these threaded holes 531, 531 is formed at a spacing that allows them to be positioned coaxially with a pair of upper and lower through holes 10d, 10d formed by penetrating the web 10a of the roof beam 10.

The first bolt fixing bracket 53 for the middle section can be fixed in a state where it protrudes from the web 10a to the outdoor side by fastening a bolt 51, which is inserted into the through hole 10d from the indoor side (arrow IN indicates the indoor direction), to the screw hole 531 while abutting against the outer surface of the web 10a of the roof beam 10 facing the outdoors (arrow OUT indicates the outdoor direction), as shown in Figures 1 and 3(a). In addition, as shown in Figure 1, a nut 57 is fastened to the bolt 51.

The second bolt fixing bracket 54 is used to fix the second bolt 52 at the position of the cylindrical joint piece 12 at the end of the roof beam 10 (ke) on the girder side shown in Figure 3 (a). In other words, since the joint piece 12 is cylindrical and the bolt 51 cannot be rotated for fastening from the indoor side, the bolt fixing bracket 54 is used to fix the bolt 52 at such a location.

The bolt fixing bracket 54 is made of a metal plate, and as shown in FIG. 4(b), is formed with a substantially L-shaped cross section, consisting of a vertically long bolt fixing plate 541 and a substantially horizontal beam fixing plate 542 that is integrally connected to the upper end of the bolt fixing plate 541. A pair of upper and lower second bolts 52, 52 are fixed to the bolt fixing plate 541 by welding or the like, in a state where they are raised at right angles. The beam fixing plate 542 is also provided with a through hole 543 through which the bolt 55 (see FIG. 3(a)) can be inserted. The bolt 52 has the same dimensions and shape as the shaft of the bolt 51, and can be fastened to the nut 57.

In addition, at the portion of the roof beam 10 (ke) where the joint piece 12 is provided, insertion holes 13, 13 are formed through the web 10a and the joint piece 12 to insert the bolt 52. In addition, an insertion hole 14 is formed through the upper flange 10b of the roof beam 10 and the joint piece 12 to insert the bolt 55.

That is, the bolt fixing bracket 54 has a pair of bolts 52, 52 inserted into the insertion holes 13, 13 from the indoor side of the web 10a, and the bolt fixing plate 541 abuts against the indoor surface of the web 10a. In this state, the beam fixing plate 542 abuts or is close to the lower surface of the upper flange 10b of the roof beam 10, and the through hole 543 and the insertion hole 14 are arranged approximately coaxially. Then, the bolt 55 is inserted into the through hole 543 and the insertion hole 14 from below, and the nut 56 is fastened to the bolt 55, thereby fixing the bolt fixing bracket 54 and the bolts 52, 52 to the roof beam 10. The arrangement of the beam fixing plate 542 relative to the bolt fixing plate 541 is set in two types symmetrically, and the tip of the beam fixing plate 542 extending from the bolt fixing plate 541 is used facing the direction of the column 11.

The bolts 51, 51 and bolts 52, 52 are fixed to the roof beam 10 at the time the building unit U is assembled in the factory.

The two types of bolts 51, 52 described above are attached to the girder-side roof beam 10 (ke) shown in FIG. 3(a), and only the bolt 51 is fixed to the gable-side roof beam 10 (tu) shown in FIG. 3(b) using a bolt fixing bracket 53.

(Explanation of parapet reinforcement material)
Next, we will explain the parapet reinforcement 40. This parapet reinforcement 40 is made of a metal plate, and as shown in Figure 1, is attached to the roof beam 10 to hold the parapet body 30 and is fixed in a predetermined position relative to the roof beam 10, and includes a reinforcement body 41, a support flange portion 42, and an attachment flange portion 43 (see Figure 5). Note that multiple parapet reinforcements 40 are installed at predetermined intervals along the roof beam 10.

The reinforcement body 41 is formed to fit the space between the parapet body 30 and the roof beam 10.

The support flange portion 42 is a portion that supports the parapet main body 30 by abutting against and being close to the back surface of the parapet main body 30, and is formed by bending the edges of the upper portion and outdoor portion of the reinforcement body 41 at approximately right angles. As shown in FIG. 5, the support flange portion 42 includes an upper flange 42a facing upward to support the parapet upper member 31 of the parapet main body 30, a middle flange 42b facing the outdoor direction to support the parapet middle member 32, and a lower flange 42c facing the outdoor direction to support the parapet lower member 33.

The reinforcement body 41 has a support recess 44 between the upper flange 42a and the middle flange 42b to support the wiring of the solar cell module SCM. Furthermore, the reinforcement body 41 has a recess 46 in the middle part on the outdoor side to attach a water return member 45 to prevent water from entering through a ventilation passage VPb (described later) formed in the parapet body 30, and a locking piece 46a is raised on the lower edge of the recess 46.

The mounting flange portion 43 is a portion for fixing the parapet reinforcement material 40 to the roof beam 10, and is formed by bending the lower edge of the interior side of the reinforcement material main body 41 at a substantially right angle. Although not shown in the figure, the mounting flange portion 43 has a bolt insertion hole 43a for inserting the bolts 51 and 52.

The parapet reinforcement 40 is fixed to the roof beam 10 by tightening a nut 57 onto the bolt 51 (52) inserted into the bolt insertion hole 43a of the mounting flange portion 43.

(Explanation of the parapet body)
The parapet body 30 is a long member that extends continuously along the eaves portion of the building H, and can be formed, for example, as an extrusion material of a light metal such as aluminum or an aluminum alloy. The parapet body 30 is formed in a substantially U-shaped cross section, and is divided into the parapet upper member 31, the parapet middle member 32, and the parapet lower member 33 as described above.

The parapet upper member 31 forms the upper surface of the eaves parapet P, and has a slope that slopes downward from the position of the roof L toward the outdoors. The middle part of this parapet upper member 31 is fixed to the upper flange 42a of the parapet reinforcement member 40 with a screw 31a, the upper end is adhered to the upper part of the above-water steel plate 26 via a foam sealant 31b, and the lower edge is adhered to the upper end of the parapet middle member 32 via a foam sealant 31c.

The parapet middle member 32 forms the side of the eaves parapet P, and its upper end is fixed to the upper end of the middle flange 42b by a screw 32a. Meanwhile, the lower part of the parapet middle member 32 is fixed by an engagement groove 32b formed on the back surface engaging with an engagement piece 46a of the parapet reinforcement member 40.

The lower end of the parapet middle member 32 is formed with a lower flange 32c that extends toward the indoor side. This lower flange 32c is disposed at a distance in the vertical direction from the lower end of the middle flange 42b of the parapet reinforcement member 40, and there is also a distance in the indoor/outdoor direction between the tip of the lower flange 32c and the lower flange 42c of the parapet reinforcement member 40.

The parapet under-member 33 covers the lower part of the parapet reinforcement 40, and the upper part of the concave main body 33a is formed with a roughly L-shaped rising part 33d extending upward and a passage forming part 33e extending to the outdoor side. The rising part 33d is fixed to the lower flange 42c of the parapet reinforcement 40 with a screw 33f. The lower flange 33c extending from the lower part of the main body 33a toward the indoor side is abutted against the upper edge of the exterior wall WO.

The passage forming portion 33e is located above the lower flange 32c of the parapet intermediate member 32, forming a vertical gap for ventilation between it and the lower flange 32c, and also forming a gap between it and the back surface of the parapet intermediate member 32 in the indoor/outdoor direction. This forms the lower ventilation passage VPb.

In addition, a ventilation passage VPa is formed at the top of the eaves parapet P, passing through the top of the eaves parapet P from between the aforementioned base steel plate 23 and the above-water steel plate 26.

(Construction method for eaves structure)
Next, a construction method for the eaves structure will be described.
This construction method is divided into a process in a factory and a process at the construction site of building H.

<Factory process>
First, the process in the factory will be described.
As described above, when assembling the building unit U at the factory, the bolts 51, 52 are fixed in advance to the roof beam 10 at predetermined positions (bolt fixing process).

The eaves parapet P is then assembled as a subassembly SA at the time of shipment from the factory (subassembly assembly process). Figure 5 shows an outline of the subassembly SA, which is preassembled with the parapet middle member 32 and parapet lower member 33 of the parapet main body 30, the foam sealant 31c, the parapet reinforcement member 40, and the water return member 45 (see Figure 1).

In other words, the subassembly SA is an integrated assembly of the members 32, 33, 45 and foam sealant 31c, whose length corresponds to the roof beam 10 to which it is to be attached, and the number of parapet reinforcement members 40 corresponding to the installation locations of the bolts 51, 52. Here, the parapet upper member 31 is used as a retrofit member to be attached to the subassembly SA later, and the portion where the parapet upper member 31 is attached is open as a work space WS.

In this embodiment, the water return member 45 is fixed with a rivet 45a (see FIG. 1). The parapet middle member 32 and the parapet lower member 33 are attached to the parapet reinforcement member 40 with the screws 32a and 33f described above.

As described above, at the time of shipment from the factory, the main parts required to assemble the eaves parapet P to the building H are the subassembly SA, the parapet upper member 31, and the nut 57. In addition, it is preferable to pre-adhere the foam sealant 31b to the parapet upper member 31.

<Construction site process>
Next, the process of assembling the eaves parapet P at the construction site will be described.
In this embodiment 1, the assembly process of the eaves parapet P is carried out after the roof panel 20 is attached to the building unit U and the roof L is installed, and includes a subassembly fixing process and a parapet upper member assembly process. Since the roof L can be installed before the eaves parapet P is attached, it is possible to shorten the time when the roof L is not installed and the top of the building H is open. Furthermore, conventionally, when the roof L is not installed, the work of attaching the eaves parapet P was easily affected by the weather, but in this embodiment, the eaves parapet P is carried out after the roof L is installed, so it is less affected by the weather.

<Sub-assembly fixing process>
When assembling the eaves parapet P, first, the subassembly SA is assembled to the roof beam 10. That is, each parapet reinforcement member 40 of the subassembly SA is placed at the position of the bolts 51 (52) already installed in the roof beam 10, as shown in Fig. 5. Then, each bolt 51 (52) is inserted into the bolt insertion hole 43a (see Fig. 1) of the mounting flange portion 43 of the parapet reinforcement member 40, and then nuts 57 are fastened to each bolt 51 (52), thereby fixing the subassembly SA to the roof beam 10.

That is, at this point, the parapet upper member 31 has not yet been installed, so the space above the subassembly SA is open as a work space WS, and the nuts 56 can be fastened from this work space WS. In addition, because the bolts 51 and 52 are fixed to the roof beam 10 in advance in a state in which they protrude outward, it is possible to fasten the nuts 56 and assemble the subassembly SA after the roof L is installed, and there is no problem in that the bolt 51 moves during fastening, which deteriorates the workability of fastening the nuts 56.

<Parapet upper component assembly process>
Next, the parapet upper member 31 is assembled from above to the subassembly SA and the roof L. That is, the upper edge of the parapet upper member 31 is brought into close contact with the above-water steel plate 26 via the foam sealant 31b, and the lower edge of the parapet upper member 31 is brought into close contact with the upper end of the parapet middle member 32 via the foam sealant 31c. Then, in this state, the parapet upper member 31 is fixed to the upper flange 42a of the parapet reinforcement member 40 with the screws 31a.

Assembling the eaves parapet P to the building H thus involves assembling and fixing the subassembly SA and assembling the parapet upper member 31. This reduces the number of man-hours at the construction site and reduces the labor and time required for work compared to attaching the parapet reinforcement 40 to the roof beam 10 and then attaching the parapet upper member 31, parapet middle member 32, parapet lower member 33, and water return member 45 to the parapet reinforcement 40.

(Effects of the First Embodiment)
The effects of the first embodiment are listed below.
1) The eaves structure of the first embodiment is an eaves structure in which an eaves parapet P is attached to the upper outer surface of a building H. The eaves parapet P comprises a plate-shaped parapet main body 30 that forms the outer surface of the eaves parapet P, and a parapet reinforcement member 40 that supports the back surface of the parapet main body 30 and is fixed to the roof beam 10 of the building H using fastening members. The fastening members comprise bolts 51, 52 that are fixed to the roof beam 10 by bolt fixing members 50 in a state that protrudes from the roof beam 10 to the outside of the building, and nuts 57 that can be tightened to the bolts 51, 52.

Then, nuts 57 are tightened onto the bolts 51, 52 inserted into the bolt insertion holes 43a formed in the parapet reinforcement 40, fixing the parapet reinforcement 40 to the roof beam 10 and attaching the eaves parapet P to the top of the building H.

Therefore, the eaves parapet P can be attached even after the roof L has been installed on the building H, and the timing of attaching the eaves parapet P to the roof beam 10 is not likely to be restricted by the timing of installing the roof L or be affected by weather, improving the flexibility of construction. In addition, since the bolts 51, 52 are fixed to the roof beam 10 by the bolt fixing member 50, the bolts 51, 52 do not move relative to the roof beam 10 when the nut 57 is tightened from the outside of the building H, resulting in excellent construction efficiency.

2) In the eaves structure of embodiment 1, the bolt fixing member 50 includes a bolt fixing bracket 53 having threaded holes 531, 531 into which the bolts 51, 51 can be tightened. The bolts 51, 51 are then passed through the roof beam 10 from the inside of the building and screwed into the threaded holes 531, 531 of the bolt fixing bracket 53 abutting the outer surface of the roof beam 10, and the bolts 51, 51 are fixed to the roof beam 10 with the roof beam 10 sandwiched between the bolt fixing bracket 53 and the bolt head.

Therefore, when fixing the bolt 51 to the roof beam 10, it is only necessary to rotate the bolt 51 and fix it in the screw hole 531, which is easier and more efficient to work with than when fixing by welding. In addition, two bolts 51, 51 can be fixed with one bolt fixing bracket 53, which reduces the number of parts compared to when nuts or other components are fastened to each of the bolts 51, 51.

3) In the eaves structure of embodiment 1, the bolt fixing member 50 includes a bolt fixing plate 541 with bolts 52, 52 provided so as to be able to penetrate the roof beam 10 while abutting against the building's inner side of the roof beam 10, and a beam fixing plate 542, bolt 55, and nut 56 as fixing members that can be fixed to the roof beam 10 while the bolt fixing plate 541 abuts against the building's inner side. The beam fixing plate 542 is fixed to the roof beam 10 with the bolt 55 and nut 56, and the bolt 52 is fixed in a state of penetrating the roof beam 10 from the building's inner side of the roof beam 10.

Therefore, even in places where it is not possible to fasten the bolts 52, 52, the bolts 52 can be fixed to the roof beam 10 using the beam fixing plate 542, the bolts 55, and the nuts 56 as fixing members.

Specifically, a joint piece 12 is provided at the location where the bolt 52 is fixed on the roof beam 10, and in the case of the bolt 51, for example, the bolt 51 cannot be rotated from the indoor side. In such a location, the bolt 52 can be fixed to the roof beam 10 by fastening the bolt fixing bracket 54 to the roof beam 10 from above using the bolt 55 and nut 56.

In addition, the bolts 52, 52 are fixed to a single bolt fixing plate 541 by welding or the like, so the number of parts can be reduced as in 2) above, and when the nut 57 is tightened, the bolt 52 does not rotate and can be tightened reliably.

4) In the construction method for the eaves structure of embodiment 1, the parapet body 30 is provided with a parapet upper member 31 as a retrofit member that can open the working space WS for fastening the nuts 57 when removed from the parapet body 30.

Then, in the factory, the process of fixing the bolts 51, 52 to the roof beam 10 with the bolt fixing member 50 and the process of assembling the subassembly SA by pre-assembling the components of the parapet main body 30 except for the parapet upper member 31 and the parapet reinforcement member 40 are carried out.

Furthermore, at the construction site, the following steps are carried out: the subassembly SA is assembled to the roof beam 10 so that the bolts 51, 52 are inserted into the bolt insertion holes 43a of the parapet reinforcement 40; the nuts 57 are tightened onto the bolts 51, 52 to fix the subassembly SA to the roof beam 10; and the parapet upper member 31 is assembled to the subassembly SA.

Therefore, compared to a construction method in which each of the components 31, 32, 33 constituting the parapet body 30 and the parapet reinforcement material 40 are attached to the roof beam 10 at the construction site, the work at the construction site can be simplified and construction efficiency can be improved. In addition, as in 1) above, the eaves parapet P can be installed even after the roof L has been laid, improving the flexibility of construction.

The embodiment of the eaves structure of this disclosure has been described in detail above with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of this invention are included in the present invention.

For example, in the embodiment, the bolt fixing means for fixing the bolts that attach the parapet reinforcement to the roof beams to the roof beams is not limited to the one shown in the embodiment, and welding or adhesive may be used as the bolt fixing means.

In addition, in the embodiment, the parapet upper member is used as the retrofit member, but this is not limited to this. Depending on the structure of the parapet body, a parapet middle member or a parapet lower member may be used, or an opening for forming a working space in a part of each member may be provided, and a removable member may be provided in this opening. In this case, it is also possible to assemble all of the parapet upper member, parapet middle member, and parapet lower member as a subassembly.

10 Roof beam 10 (ke) (beam side) roof beam 10 (tu) (gable side) roof beam 31 Parapet upper member (retrofit member)
40 Parapet reinforcement material 41 Reinforcement material body 43a Bolt insertion hole 50 Bolt fixing member (bolt fixing means)
51 (first) bolt 52 (second) bolt 53 (first) bolt fixing bracket 54 (second) bolt fixing bracket 55 Bolt 56 Nut 57 Nut 531 Screw hole 541 Bolt fixing plate 542 Beam fixing plate H Building L Roof P Eaves parapet SA Sub-assembly WS Work space

Claims (3)

A eaves structure with a eaves parapet attached to the upper outer surface of the building,
The eaves parapet is
A plate-shaped parapet body forming the outer surface of the eaves parapet;
A parapet reinforcement member that supports the back surface of the parapet body and is fixed to the roof beam of the building using a fastening member;
Equipped with
The fastening member includes a bolt fixed to the roof beam by a bolt fixing means in a state where the bolt protrudes from the roof beam to the outside of the building, and a nut that can be tightened to the bolt,
The parapet reinforcement is fixed to the roof beam by tightening the nut to the bolt inserted into the bolt insertion hole formed in the parapet reinforcement ,
The bolt fixing means includes a bolt fixing bracket having a screw hole into which the bolt can be fastened,
The bolt penetrates the roof beam from the inside of the building and is screwed into the screw hole of the bolt fixing bracket abutted against the outer surface of the roof beam, and the bolt is fixed to the roof beam with the roof beam sandwiched between the bolt fixing bracket and the bolt head . A eaves structure with a eaves parapet attached to the upper outer surface of the building,
The eaves parapet is
A plate-shaped parapet body forming the outer surface of the eaves parapet;
A parapet reinforcement member that supports the back surface of the parapet body and is fixed to the roof beam of the building using a fastening member;
Equipped with
The fastening member includes a bolt fixed to the roof beam by a bolt fixing means in a state where the bolt protrudes from the roof beam to the outside of the building, and a nut that can be tightened to the bolt,
The parapet reinforcement is fixed to the roof beam by tightening the nut to the bolt inserted into the bolt insertion hole formed in the parapet reinforcement,
The bolt fixing means includes a bolt fixing plate in which the bolt is provided so as to be able to penetrate the roof beam in a state in which the bolt fixing plate is in contact with the building inner side of the roof beam, and a fixing member capable of fixing the bolt fixing plate to the roof beam in a state in which the bolt fixing plate is in contact with the building inner side,
An eaves structure in which the fixing member is fixed to the roof beam and the bolt is fixed in a state where it penetrates the roof beam from the inside of the building. A construction method for the eaves structure according to claim 1 or 2 ,
The parapet body includes a retrofit member capable of opening a working space for fastening the nut when removed from the parapet body,
In the factory,
fastening the bolt to the roof beam by the bolt fastening means;
A step of assembling a subassembly by previously assembling the members of the parapet body excluding the retrofitting member and the parapet reinforcement material,
At the construction site of the building,
a step of assembling the subassembly to the roof beam so that the bolt is inserted into the bolt insertion hole of the parapet reinforcement material, and fastening the nut to the bolt to fix the subassembly to the roof beam;
assembling the retrofit member to the subassembly;
A construction method for eaves structure that achieves the above.