JP7827092B2 - Safety belt attachment device, building, and installation method for safety belt attachment device - Google Patents

Description

This disclosure relates to safety belt attachment devices, buildings, and methods for installing safety belt attachment devices.

To ensure the safety of workers working on the roof of a building, safety belt attachment devices are installed on the roof to which workers' safety belts are attached. From the perspective of worker safety, the safety belt attachment devices must be sufficiently strong. Patent Document 1 discloses a safety belt attachment device that is fixed to a cross member (referred to as a ridge beam in the document).

Japanese Patent Application Laid-Open No. 2006-342599

However, some buildings do not have safety harness attachments installed on their roofs. When working on roofs that do not have safety harness attachments during renovations or other such work, it is necessary to retrofit safety harness attachments to the roof before starting work on the roof. Retrofitting safety harness attachments involves dismantling portions of the roof, such as roofing materials and sheathing boards, and then fastening the safety harness attachments to the cross members, which are structural members of the roof. After fastening the safety harness attachments to the cross members is complete, the demolished portion of the roof is restored.

With conventional safety belt fastening structures, workers must enter the attic of a building and fasten the safety belt fastening to a cross member from there. In this case, part of the roof truss must be dismantled in order for the worker to enter the attic. As such, with conventional safety belt fastening structures, it is not easy to install a safety belt fastening on an existing roof when retrofitting the device.

(1) A safety belt attachment device that solves the above problem is a safety belt attachment device for attaching a safety belt to a roof, and comprises an upper fitting with which the safety belt engages, and a lower fitting connected to the upper fitting and attached to a cross member of the roof, the lower fitting having a fixing part fixed to the cross member and a lower connecting part connected to the fixing part and joining with the upper fitting, the fixing part having a first fixing part fixed to the lower part of the cross member and a second fixing part fixed to the upper part of the cross member, and the lower fitting is composed of multiple parts fastened together.

With this configuration, the lower fitting is made up of multiple parts fastened together, so the size of each of the multiple parts that make up the lower fitting is small. Because the lower fitting is divided into multiple small parts in this way, less of the roof needs to be dismantled when the safety belt attachment device is retrofitted to the roof. Therefore, when retrofitting the safety belt attachment device to the roof, less of the roof needs to be dismantled around the attachment point where the safety belt attachment device is attached, making it easy to retrofit the safety belt attachment device to the roof.

(2) In the safety belt mounting device described in (1) above, the lower metal fitting includes a first part having the lower connecting portion and either the first fixing portion or the second fixing portion of the fixing portions, and a second part having the other of the first fixing portion or the second fixing portion of the fixing portions, and further includes a fastening member that fastens the first part and the second part.

With this configuration, the fixing portion is fixed to the cross member by fastening the first and second parts with the fastening member, so the lower fitting can be attached to the cross member using the fastening member.

(3) In the safety belt attachment device described in (2) above, the fastening member is a bolt, one of the first part and the second part has a nut that fastens to the bolt, and the other of the first part and the second part has an elongated hole through which the bolt passes.

With this configuration, the first and second parts are fastened together by inserting the bolt through the elongated hole and tightening the bolt into the nut. The position of the second fixing part relative to the first fixing part can be adjusted by moving the bolt within the elongated hole before fully tightening the bolt into the nut. By adjusting the position of the second fixing part relative to the first fixing part, the fixing force can be adjusted according to the size of the cross member.

(4) In the safety belt attachment device described in (2) or (3) above, at least one of the first part and the second part has a temporary fastening portion that is temporarily fastened to the cross member when the safety belt attachment device is installed.

With this configuration, at least one of the first and second parts is temporarily fastened to the cross member by the temporary fastening portion, preventing at least one of the first and second parts from falling when the safety belt attachment device is installed.

(5) In the safety belt mounting device described in any one of (1) to (4) above, the first fixing part includes a first flat part that contacts the underside of the cross member and two first protrusions that protrude upward from the first flat part along the side of the cross member so as to sandwich the cross member, and the second fixing part includes a second flat part that contacts the upper surface of the cross member and two second protrusions that protrude downward from the second flat part along the side of the cross member so as to sandwich the cross member.

With this configuration, the first fixing portion engages with the lower part of the cross member using the first flat portion and two first protrusions, and the second fixing portion engages with the upper part of the cross member using the second flat portion and two second protrusions, allowing the fixing portion to be firmly fixed to the cross member.

(6) A building that solves the above problem is a building with a roof, the roof comprising a cross member, a sheathing board placed on the cross member, a roofing material placed on the sheathing board, and a safety belt attachment device described in any one of (1) to (5) above.

This configuration allows the safety harness attachment device to be easily retrofitted to the roof, making work on the roof of a building safer.

(7) In the building described in (6) above, the roof has a first roof section extending at an angle from the ridge of the roof, and a second roof section extending at an angle from the ridge in the opposite direction to the first roof section, the first roof section having a first cross member arranged at the ridge, and the second roof section having a second cross member arranged at the ridge, and the safety belt attachment device is fixed to either the first cross member or the second cross member.

With this configuration, on roofs such as gable roofs, the fixing part is fixed to either the first cross member or the second cross member. Therefore, when installing the safety belt attachment device, the safety belt attachment device can be installed simply by dismantling either the first roof section or the second roof section. This reduces the amount of work required to dismantle and restore the roof compared to when both the first and second roof sections must be dismantled and restored.

(8) A construction method that solves the above problem is a method of installing a safety belt attachment device for hanging a safety belt on a roof, wherein the roof comprises a cross member, a sheathing board placed on the cross member, and a roofing material placed on the sheathing board, and the safety belt attachment device comprises an upper metal fitting with which the safety belt engages and a lower metal fitting connected to the upper metal fitting and attached to the cross member, and the lower metal fitting has a fixing part fixed to the cross member and a lower connecting part connected to the fixing part and joined to the upper metal fitting. The method includes a dismantling process in which the sheathing boards and roofing material around the attachment points on the roof where the safety belt attachment devices are attached are dismantled to expose the cross members from the roof; a fixing process in which the fixing parts of the lower fittings are fixed to the cross members from above the roof; a restoration process in which the sheathing boards and roofing material around the attachment points that were dismantled in the dismantling process are restored; and a connection process in which the upper fittings are connected to the lower fittings by joining the upper fittings to the lower joint parts of the lower fittings.

With this configuration, the lower bracket can be secured to the cross member by fastening the fixing part to the cross member from above the roof, eliminating the need for workers to enter the roof attic. This reduces the area of the roof that needs to be dismantled during the demolition process. Because the amount of work required for dismantling and restoration is reduced, safety harness attachment devices can be more easily retrofitted to the roof.

The safety belt attachment device, building, and safety belt attachment device installation method disclosed herein allow the safety belt attachment device to be easily retrofitted to a roof.

1 is a schematic diagram of a building according to an embodiment. FIG. 2 is a schematic diagram of the roof of FIG. 1; FIG. 2 is a cross-sectional view of the roof of FIG. 1 near the ridge. FIG. 10 is a front view of a first part of the lower metal fitting. FIG. 10 is a side view of a first part of the lower metal fitting. FIG. 10 is a front view of a second part of the lower metal fitting. FIG. 10 is a side view of a second part of the lower metal fitting. FIG. 10 is a plan view of a second part of the lower metal fitting. 10A and 10B are diagrams showing a part of a dismantling process in the installation method of a safety belt attachment device. 10A and 10B are diagrams showing a part of a fixing process in a method of installing a safety belt attachment device. 10A and 10B are diagrams showing a part of a fixing process in a method of installing a safety belt attachment device. 10A and 10B are diagrams showing a part of a fixing process in a method of installing a safety belt attachment device.

<Embodiment>
1 to 12, a building 10, a safety belt attachment device 40, and a method for installing the safety belt attachment device 40 according to this embodiment will be described.

<Buildings>
As shown in FIG. 1 , an example of a building 10 is a residential house. The building 10 includes a roof 20. The roof 20 is disposed on an interior space surrounded by exterior walls 11. While FIG. 1 illustrates the roof 20 as a gable roof, the roof 20 may also be a hip roof. The ridge 21 of the roof 20 is configured as a ventilation ridge that allows ventilation between the attic and the outdoors. The roof 20 includes a first roof portion 22 that extends at an angle from the ridge 21 of the roof 20, and a second roof portion 23 that extends at an angle from the ridge 21 in the opposite direction to the first roof portion 22. In a plan view of the roof 20, the first roof portion 22 and the second roof portion 23 slope toward the ground as they move away from the ridge 21 along a second direction D2 perpendicular to the first direction D1 in which the ridge 21 extends.

As shown in Figures 2 and 3, the roof 20 comprises cross members 24, sheathing boards 25 placed on the cross members 24, roofing materials 26 placed on the sheathing boards 25, and safety belt attachment devices 40. The roof 20 may further comprise roofing materials 27 placed on the roofing materials 26. In Figure 2, the roofing materials 27, ridge wrap 32, flashing 33, waterproofing members 34, and upper fittings 50 of the safety belt attachment devices 40 are omitted from the roof 20.

The cross members 24 are part of the structural materials that support the building 10. In addition to the cross members 24, the structural materials of the building 10 include elements such as columns, girders, foundations, and footings. The cross members 24 are horizontal beams. In this embodiment, the cross members 24 are part of the truss structure of the building 10. Of the multiple cross members 24, the first cross member 36 and the second cross member 37, which are closest to the ridge 21, are the ridge beams of the roof 20. The cross members 24 are made of wood. The cross members 24 are placed on the slope beams 28 via first fittings 29A. The slope beams 28 are, for example, H-shaped steel. The cross members 24 are fixed to the first fittings 29A, which are fixed to the slope beams 28, by fixing members 30. The first fittings 29A are made of L-shaped angles. The fixing members 30 are, for example, bolts. The cross members 24 are arranged so that the lower surfaces 24B of the cross members 24 are aligned with the upper surfaces 28T of the gradient beams 28. Multiple gradient beams 28 are arranged at intervals in the first direction D1. A base material 31 is arranged on top of the roof material 26 via second fittings 29B. The second fittings 29B are arranged from the first roof section 22 to the second roof section 23. Multiple second fittings 29B are arranged at intervals in the first direction D1.

As shown in FIG. 3, a ridge wrap 32 is placed over the ridge portion 21. The ridge wrap 32 is positioned to cover the opening between the first roof portion 22 and the second roof portion 23 of the ridge portion 21. The opening between the first roof portion 22 and the second roof portion 23 connects the attic of the building 10 to the outdoors. A watertight material 34 and a waterproofing member 33 are placed on the roof 20. The watertight material 33 is positioned to extend from above the base material 31 to above the roofing material 27. The space between the watertight material 33 and the roofing material 27 is sealed with a waterproofing material 35. The waterproofing member 34 is, for example, a waterproof sheet. The waterproofing member 34 is placed between the sheathing boards 25 and the roofing material 26, on the top surface of the roofing material 26, and on the side of the base material 31.

The cross members 24 include a first cross member 36 arranged near the ridge 21 and a second cross member 37 arranged near the ridge 21. The first roof section 22 has the first cross member 36. The second roof section 23 has the second cross member 37.

<Safety belt attachment device>
The safety belt attachment device 40 shown in Fig. 3 is used to attach a safety belt to the roof 20. The safety belt attachment device 40 comprises an upper fitting 50 with which the safety belt engages, and a lower fitting 60 attached to the cross member 24. The lower fitting 60 is connected to the upper fitting 50. The safety belt attachment device 40 is fixed to either the first cross member 36 or the second cross member 37. In the example of Fig. 3, the safety belt attachment device 40 is fixed to the first cross member 36.

<Upper bracket>
The upper fitting 50 is placed on the base material 31. The upper fitting 50 has a safety belt attachment part 51 to which a safety belt is attached, and an upper connecting part 52 that connects to the lower fitting 60. The safety belt attachment part 51 is provided with an attachment hole 53 for hanging the hook of the safety belt. The upper connecting part 52 is provided with a first hole 54 through which a fastening member 110 is inserted. The fastening member 110 is, for example, a bolt.

<Lower bracket>
The lower bracket 60 is positioned so as to be located in the opening between the first roof section 22 and the second roof section 23 from the space below the sheathing board 25. The lower bracket 60 has a fixing portion 61 fixed to the cross member 24 and a lower connecting portion 62 that connects to the upper bracket 50. The lower connecting portion 62 is connected to the fixing portion 61. The fixing portion 61 has a first fixing portion 63 fixed to the lower portion 24X of the cross member 24 and a second fixing portion 64 fixed to the upper portion 24Y of the cross member 24. The fixing portion 61 is fixed to the cross member 24 by the first fixing portion 63 and the second fixing portion 64 sandwiching the cross member 24 from both the upper portion 24Y and the lower portion 24X.

The first fixing portion 63 engages with the lower portion 24X of the cross member 24. The first fixing portion 63 includes a first flat portion 66 that contacts the underside 24B of the cross member 24, and two first protrusions 67 that protrude upward from the first flat portion 66 along the side surface 24S of the cross member 24, sandwiching the cross member 24. The two first protrusions 67 suppress movement of the first fixing portion 63 relative to the cross member 24 in the short direction of the cross section of the cross member 24.

The second fixing portion 64 engages with the upper portion 24Y of the cross member 24. The second fixing portion 64 includes a second flat portion 69 that contacts the upper surface 24T of the cross member 24, and two second protrusions 70 that protrude downward from the second flat portion 69 along the side surface 24S of the cross member 24, sandwiching the cross member 24. The two second protrusions 70 suppress movement of the second fixing portion 64 relative to the cross member 24 in the short direction of the cross section of the cross member 24.

The lower joint 62 has a lower fastening portion 71. The lower fastening portion 71 is, for example, a nut. A fastening member 110 is inserted through a first hole 54 provided in the upper joint 52 of the upper fitting 50 and fastened to the lower fastening portion 71, thereby joining the upper joint 52 of the upper fitting 50 to the lower joint 62 of the lower fitting 60. The central axis of the lower fastening portion 71 coincides with the vertical line C1 of the ridge portion 21.

As shown in Figures 3 to 8, the lower metal fitting 60 is formed by fastening multiple parts 60A. The lower metal fitting 60 is formed by fastening, for example, two parts 60A. The lower metal fitting 60 has a first part 80 and a second part 90. The first part 80 has a lower joint portion 62 and one of the first fixed part 63 and the second fixed part 64 of the fixing part 61. The second part 90 has the other of the first fixed part 63 and the second fixed part 64 of the fixing part 61. In this embodiment, the first part 80 has the lower joint portion 62 and the first fixed part 63, and the second part 90 has the second fixed part 64.

The safety belt attachment device 40 further includes a fastening member 100 that fastens the first part 80 and the second part 90. The fastening member 100 is a bolt 101. Either the first part 80 or the second part 90 has a nut 88 that fastens to the bolt 101. The other of the first part 80 or the second part 90 has an elongated hole 94 through which the bolt 101 passes. In this embodiment, the first part 80 has the nut 88, and the second part 90 has the elongated hole 94. When installing the safety belt attachment device 40, the fastening member 100 can be operated from above the roof 20.

As shown in Figures 4 and 5, the first part 80 has a first support part 81 that supports the lower joint part 62 relative to the first fixing part 63, and a first fastening part 82 that is provided on the first support part 81 and fastens to the second part 90. The first support part 81 has a first linear part 83 that extends along a vertical line C1 that intersects with the extension direction of the ridge part 21 when viewed from the front of the ridge part 21 (see Figure 3). The first fastening part 82 is disposed on the first linear part 83. A second hole 84 is provided in the first linear part 83.

At least one of the first part 80 and the second part 90 has a temporary fastening portion 85 that is temporarily fastened to the cross member 24 when the safety belt attachment device 40 is installed. In this embodiment, the first part 80 has the temporary fastening portion 85. The temporary fastening portion 85 is provided on the first protrusion 67. The temporary fastening portion 85 has a third hole 87 through which a temporary fastening member 86 is inserted (see Figure 3). The temporary fastening member 86 is, for example, a screw.

As shown in Figures 6 to 8, the second part 90 has a second support portion 91 and a second fastening portion 92 that fastens to the first fastening portion 82 of the first part 80. The second support portion 91 supports the second fastening portion 92 relative to the second fixing portion 64. The second fastening portion 92 has a second linear portion 93 that extends along the vertical line C1 in a front view of the ridge portion 21 (see Figure 3). The second linear portion 93 has an elongated hole 94. The elongated hole 94 extends along the vertical line C1 in a front view of the ridge portion 21.

<How to install the safety belt attachment device>
2, 3, and 9 to 12, a method for installing the safety belt attachment device 40 will be described.
The installation method for the safety belt fastening device 40 is a method of attaching the safety belt fastening device 40 for hanging a safety belt to the roof 20. The installation method for the safety belt fastening device 40 is a method of retrofitting the safety belt fastening device 40 to a roof 20 in a state where no safety belt fastening device 40 has been installed. Below, a case where the safety belt fastening device 40 is attached to the first cross member 36 of the cross members 24 will be described.

The construction method includes a dismantling process, a fixing process, a restoration process, and a connection process. The construction method further includes a preparation process.

In the preparation process, preparations are made for the dismantling process. During this process, the ridge wrap 32, the undercut 33, and the roofing material 27 around the attachment points of the roof 20 where the safety belt attachment devices 40 are attached are removed from the roof 20. The portions of the undercut 33 and the roofing material 27 that will be placed on the first roof section 22 are removed.

As shown in Figure 9, during the demolition process, the sheathing boards 25 and roofing material 26 around the mounting portion of the roof 20 are removed to expose the cross member 24 from the roof 20. The mounting portion is set in a location that does not overlap with the second metal fitting 29B in the first direction D1. By dismantling the roof 20, a work opening WP is created around the mounting portion of the roof 20, allowing workers on the roof 20 to reach the periphery of the cross member 24. During the demolition process, the waterproofing material 34 located around the mounting portion is cut away, and then the sheathing boards 25 and roofing material 26 located around the mounting portion are cut away. In the example of Figure 9, the base material 31 located around the mounting portion is also dismantled.

As shown in Figures 10 to 12, in the fixing process, the fixing portion 61 of the lower bracket 60 is fixed to the cross member 24 from above the roof 20. The worker performs the fixing process from above the roof 20 through the work opening WP. As shown by the two-dot chain line in Figure 10, the first part 80 is inserted between the first cross member 36 and the second cross member 37, and the first fixing portion 63 is engaged with the lower part 24X of the cross member 24. As shown in Figure 11, a temporary fixing member 86 is driven into the temporary fixing portion 85 to temporarily fix the first part 80 to the cross member 24. A tool for driving the screw, which is the temporary fixing member 86, is inserted through the work opening WP. As shown in Figure 12, the second fixing portion 64 is engaged with the upper part 24Y of the cross member 24, thereby attaching the second part 90 to the upper part 24Y of the cross member 24. The first fastening portion 82 of the first component 80 and the second fastening portion 92 of the second component 90 are then fastened together using the fastening member 100. A tool for fastening the bolt 101, which is the fastening member 100, is inserted through the work opening WP. At this time, the fastening force of the fixing portion 61 can be adjusted according to the size of the cross member 24 by moving the bolt 101 within the elongated hole 94.

In the restoration process, the sheathing boards 25 and roofing materials 26 located around the attachment points that were dismantled in the demolition process are restored. In the restoration process, the work opening WP opened in the roof 20 during the demolition process is closed. After the sheathing boards 25 and roofing materials 26 located around the attachment points are restored, the underlayment material 31 and waterproofing member 34 located around the attachment points are restored. As a result of the restoration process, the roof 20 will be in the state shown in Figure 2. In the restoration process, the underlayment 33 and roofing materials 27 may also be restored.

In the connection process, the upper fitting 50 is connected to the lower fitting 60 by joining the upper fitting 50 to the lower joint 62 of the lower fitting 60. After connecting the upper fitting 50 to the lower fitting 60, the ridge envelope 32 is attached. As a result of the connection process, the roof 20 is in the state shown in Figure 3.

<Operation of the embodiment>
The operation of this embodiment will be described.
The lower metal fitting 60 of the safety belt attachment device 40, which is attached to the cross member 24, is composed of multiple parts 60A fastened together. By dividing the parts into multiple parts, the size of each part 60A becomes smaller. Therefore, when installing the safety belt attachment device 40, even if the working opening WP is small, the work of attaching each part 60A to the cross member 24 can be performed from above the roof 20.

<Effects of the embodiment>
The effects of this embodiment will be described.
(1) The safety belt fastening device 40 comprises an upper fitting 50 with which the safety belt engages, and a lower fitting 60 connected to the upper fitting 50 and attached to the cross member 24 of the roof 20. The lower fitting 60 has a fixing portion 61 fixed to the cross member 24, and a lower joining portion 62 connected to the fixing portion 61 and joined to the upper fitting 50. The fixing portion 61 has a first fixing portion 63 fixed to the lower portion 24X of the cross member 24, and a second fixing portion 64 fixed to the upper portion 24Y of the cross member 24. The lower fitting 60 is formed by fastening a plurality of parts 60A together.

With this configuration, the lower fitting 60 is made up of multiple parts 60A fastened together, so the size of each of the multiple parts 60A that make up the lower fitting 60 is small. Because the lower fitting 60 is divided into multiple small parts in this way, only a small portion of the roof 20 needs to be dismantled when the safety belt attachment device 40 is retrofitted to the roof 20. Therefore, when retrofitting the safety belt attachment device 40 to the roof 20, the portion of the roof 20 that needs to be dismantled around the attachment portion where the safety belt attachment device is attached can be reduced, making it easy to retrofit the safety belt attachment device 40 to the roof 20.

(2) The lower metal fitting 60 has a first part 80 having a lower connecting part 62 and either the first fixing part 63 or the second fixing part 64 of the fixing part 61, and a second part 90 having the other of the first fixing part 63 or the second fixing part 64 of the fixing part 61. The safety belt attachment device 40 further includes a fastening member 100 that fastens the first part 80 and the second part 90 together.

With this configuration, the fastening member 100 fastens the first part 80 and the second part 90 together, thereby fixing the fixing portion 61 to the cross member 24, and therefore the fastening member 100 can be used to attach the lower fitting 60 to the cross member 24.

(3) The fastening member 100 is a bolt 101. Either the first part 80 or the second part 90 has a nut 88 that fastens to the bolt 101. The other of the first part 80 or the second part 90 has an elongated hole 94 through which the bolt 101 is inserted.

With this configuration, the first part 80 and the second part 90 are fastened together by inserting the bolt 101 through the elongated hole 94 and tightening the bolt 101 into the nut 88. The position of the second fixing part 64 relative to the first fixing part 63 can be adjusted by moving the bolt 101 within the elongated hole 94 before completely tightening the bolt 101 into the nut 88. By adjusting the position of the second fixing part 64 relative to the first fixing part 63, the fixing force can be adjusted according to the size of the cross member 24.

(4) At least one of the first part 80 and the second part 90 has a temporary fastening portion 85 that is temporarily fastened to the cross member 24.

With this configuration, at least one of the first part 80 and the second part 90 is temporarily fastened to the cross member 24 by the temporary fastening portion 85. This prevents at least one of the first part 80 and the second part 90 from falling when the safety belt attachment device 40 is installed.

(5) The first fixing portion 63 includes a first flat portion 66 that contacts the underside 24B of the cross member 24, and two first protruding portions 67 that protrude upward from the first flat portion 66 along the side surface 24S of the cross member 24, so as to sandwich the cross member 24. The second fixing portion 64 includes a second flat portion 69 that contacts the upper surface 24T of the cross member 24, and two second protruding portions 70 that protrude downward from the second flat portion 69 along the side surface 24S of the cross member 24, so as to sandwich the cross member 24.

With this configuration, the first fixing portion 63 engages with the lower portion 24X of the cross member 24 via the first flat portion 66 and the two first protrusions 67. Furthermore, the second fixing portion 64 engages with the upper portion 24Y of the cross member 24 via the second flat portion 69 and the two second protrusions 70. This allows the fixing portion 61 to be firmly fixed to the cross member 24.

(6) The building 10 has a roof 20. The roof 20 has cross members 24, sheathing boards 25 placed on the cross members 24, roofing materials 26 placed on the sheathing boards 25, and safety belt attachment devices 40.

This configuration allows the safety belt attachment device 40 to be easily retrofitted to the roof 20. This makes work on the roof 20 of the building 10 safer.

(7) The roof 20 has a first roof section 22 that extends at an angle from the ridge 21 of the roof 20, and a second roof section 23 that extends at an angle from the ridge 21 in the opposite direction to the first roof section 22. The first roof section 22 has a first cross member 36 that is positioned near the ridge 21. The second roof section 23 has a second cross member 37 that is positioned near the ridge 21. The safety belt attachment device 40 is fixed to either the first cross member 36 or the second cross member 37.

With this configuration, in roofs such as gable roofs, the fixing part 61 is fixed to either the first cross member 36 or the second cross member 37. Therefore, when installing the safety belt attachment device 40, the safety belt attachment device 40 can be installed simply by dismantling either the first roof section 22 or the second roof section 23. This reduces the amount of work required to dismantle and restore the roof compared to when both the first roof section 22 and the second roof section 23 need to be dismantled and restored.

(8) The installation method for the safety belt attachment device 40 includes a dismantling process, a fixing process, a restoration process, and a connection process. In the dismantling process, the sheathing boards 25 and roofing material 26 around the attachment portion of the roof 20 where the safety belt attachment device 40 is attached are removed, thereby exposing the cross member 24 from the roof 20. In the fixing process, the fixing portion 61 of the lower fitting 60 is fixed to the cross member 24 from above the roof 20. In the restoration process, the sheathing boards 25 and roofing material 26 around the attachment portion that were removed in the dismantling process are restored. In the connection process, the upper fitting 50 is connected to the lower fitting 60 by joining the upper fitting 50 to the lower joint portion 62 of the lower fitting 60.

With this configuration, the lower fitting 60 can be secured to the cross member 24 by fastening the fixing portion 61 to the cross member 24 from above the roof 20, eliminating the need for workers to enter the attic of the roof 20. This reduces the area of the roof 20 that is dismantled during the dismantling process. Because the amount of work required for dismantling and restoration is reduced, the safety harness attachment device 40 can be more easily retrofitted to the roof.

Furthermore, the task of fixing the fixing part 61 to the cross member 24 while looking up at the cross member 24 from the attic of the roof 20 places a great burden on the worker. However, since the worker can work on the roof 20, they can work in a posture that places less strain on the worker.

<Modification>
The above-described embodiment is an example of possible forms that the building 10, the safety belt attachment device 40, and the installation method of the safety belt attachment device 40 can take, and is not intended to limit the forms. The building 10, the safety belt attachment device 40, and the installation method of the safety belt attachment device 40 can take forms different from those exemplified in the above-described embodiment. Examples of such forms include forms in which part of the configuration of the embodiment is replaced, changed, or omitted, or forms in which a new configuration is added to the embodiment. Modified examples of the embodiment are shown below.

- While the roof 20 has been described in which the first cross member 36 and the second cross member 37 form the ridge beam, the safety belt fastening device 40 can also be applied to roofs where the ridge beam is made up of a single cross member. Even on such roofs, the safety belt fastening device 40 can be installed by dismantling and restoring only either the first roof section or the second roof section.

- In the embodiment, an example was shown in which the lower metal fitting 60 was composed of a first part 80 and a second part 90, but the lower metal fitting 60 may be composed of three or more parts 60A. For example, the lower metal fitting 60 has a part 60A having a lower joining portion 62, a part 60A having a first fixing portion 63, and a part 60A having a second fixing portion 64. The three parts 60A are fastened together by a fastening member 100.

The first part 80 may have the lower joining portion 62 and the second fixing portion 64, and the second part 90 may have the first fixing portion 63. In this modification, the lower joining portion 62 and the second fixing portion 64 are integrally configured, and the first fixing portion 63 is configured separately from the lower joining portion 62 and the second fixing portion 64.

- The fastening member 100 may be composed of a member other than the bolt 101. For example, the fastening member 100 may be a metal member such as a screw, a hose band, or wire, as long as it can fasten the first part 80 and the second part 90 together.

- A long hole 94 may be provided in the first component 80. For example, a long hole may be provided instead of the second hole 84 in the first straight portion 83.

- The temporary fastening portion 85 may be provided on the second part 90, or on both the first part 80 and the second part 90.

- Although an example has been shown in which the temporary fastening member 86 is a screw, the temporary fastening member 86 may also be, for example, a string tied somewhere on the roof 20, as long as it can prevent at least one of the first part 80 and the second part 90 from falling.

- The configuration of the first fixing portion 63 and the second fixing portion 64 is not particularly limited as long as the fixing portion 61 does not come off the cross member 24. The first protrusion 67 closer to the ridge 21 of the roof 20 may be omitted from the first fixing portion 63. The second protrusion 70 closer to the ridge 21 of the roof 20 may be omitted from the second fixing portion 64.

The present specification discloses the following techniques.
[Appendix 1]
A safety belt attachment device for attaching a safety belt to a roof, comprising: an upper fitting with which the safety belt engages; and a lower fitting connected to the upper fitting and attached to a cross member of the roof, wherein the lower fitting has a fixing part fixed to the cross member and a lower joining part connected to the fixing part and joining with the upper fitting, and the fixing part has a first fixing part fixed to a lower part of the cross member and a second fixing part fixed to an upper part of the cross member, and the lower fitting is formed by fastening a plurality of parts together.
[Appendix 2]
The safety belt mounting device described in Appendix 1, wherein the lower metal fitting has a first part having the lower joining portion and either the first fixing portion or the second fixing portion of the fixing portions, and a second part having the other of the first fixing portion or the second fixing portion of the fixing portions, and further includes a fastening member that fastens the first part and the second part.
[Appendix 3]
3. The safety belt mounting device according to claim 2, wherein the fastening member is a bolt, one of the first part and the second part has a nut for fastening with the bolt, and the other of the first part and the second part has an elongated hole through which the bolt is inserted.
[Appendix 4]
3. The safety belt attachment device according to claim 2, wherein at least one of the first part and the second part has a temporary fastening portion that is temporarily fastened to the cross member when the safety belt attachment device is installed.
[Appendix 5]
The safety belt mounting device described in Appendix 1, wherein the first fixing portion includes a first flat portion in contact with the underside of the cross member and two first protruding portions protruding upward from the first flat portion along the side surfaces of the cross member so as to sandwich the cross member, and the second fixing portion includes a second flat portion in contact with the upper surface of the cross member and two second protruding portions protruding downward from the second flat portion along the side surfaces of the cross member so as to sandwich the cross member.
[Appendix 6]
A building having a roof, the roof comprising: a cross member; a sheathing board placed on the cross member; a roofing material placed on the sheathing board; and a safety belt attachment device according to any one of appendices 1 to 5.
[Appendix 7]
The building described in Appendix 6, wherein the roof has a first roof section extending at an angle from the ridge of the roof, and a second roof section extending at an angle from the ridge in a direction opposite to the first roof section, the first roof section having a first cross member arranged at the ridge, and the second roof section having a second cross member arranged at the ridge, and the safety belt attachment device is fixed to either the first cross member or the second cross member.
[Appendix 8]
A method for installing a safety belt attachment for hanging a safety belt on a roof, the roof comprising a cross member, a sheathing board placed on the cross member, and a roof material placed on the sheathing board, the safety belt attachment comprising an upper metal fitting with which the safety belt engages, and a lower metal fitting connected to the upper metal fitting and attached to the cross member, the lower metal fitting having a fixing part fixed to the cross member and a lower joint part connected to the fixing part and joined to the upper metal fitting, a dismantling step of exposing the cross member from the roof by dismantling the sheathing boards and the roof material around an attachment portion where the device is attached; a fixing step of fixing the fixing portion of the lower fitting to the cross member from above the roof; a restoration step of restoring the sheathing boards and the roof material located around the attachment portion that were dismantled in the dismantling step; and a connecting step of connecting the upper fitting to the lower fitting by joining the upper fitting to the lower joint portion of the lower fitting.

10...building, 20...roof, 21...ridge, 22...first roof section, 23...second roof section, 24...horizontal member, 25...sheathing board, 26...roofing material, 36...first horizontal member, 37...second horizontal member, 40...safety belt attachment device, 50...upper metal fitting, 60...lower metal fitting, 60A...part, 61...fixing portion, 62...lower connecting portion, 63...first fixing portion, 64...second fixing portion, 66...first flat portion, 67...first protruding portion, 69...second flat portion, 70...second protruding portion, 80...first part, 85...temporary fastening portion, 88...nut, 90...second part, 94...long hole, 100...fastening member, 101...bolt.

Claims (7)

A safety belt attachment device for attaching a safety belt to a roof,
an upper fitting with which the safety belt engages;
A lower metal fitting connected to the upper metal fitting and attached to the roof cross member, and a fastening member are provided,
The lower metal fitting has a fixing portion fixed to the cross member and a lower joining portion connected to the fixing portion and joined to the upper metal fitting,
The fixing portion is
A first fixing portion fixed to a lower portion of the cross member;
A second fixing portion fixed to the upper portion of the cross member,
the lower metal fitting is configured by fastening a first part and a second part together with the fastening member ,
the first component includes the lower joint portion, the first fixed portion, a first support portion configured to connect the lower joint portion and the first fixed portion and to support the lower joint portion relative to the first fixed portion, and a first fastening portion provided on the first support portion,
the second component includes the second fixing portion, a second fastening portion fastened to the first fastening portion, and a second support portion configured to connect the second fastening portion and the second fixing portion and support the second fastening portion relative to the second fixing portion,
the fastening member fastens the first fastening portion of the first component and the second fastening portion of the second component,
The first part and the second part are configured such that, when the safety belt attachment device is attached to the cross member, the first fastening portion of the first part and the second fastening portion of the second part are positioned above the second fixing portion.
Safety belt attachment device. the fastening member is a bolt,
one of the first part and the second part has a nut to be fastened to the bolt,
the other of the first component and the second component has an elongated hole through which the bolt is inserted;
2. The safety belt attachment device of claim 1 . At least one of the first part and the second part has a temporary fastening portion that is temporarily fastened to the cross member when the safety belt attachment device is installed.
2. The safety belt attachment device of claim 1 . The first fixing portion includes a first planar portion in contact with the underside of the cross member, and two first protruding portions protruding upward from the first planar portion along the side surfaces of the cross member so as to sandwich the cross member,
The second fixing portion includes a second planar portion in contact with the upper surface of the cross member, and two second protruding portions protruding downward from the second planar portion along the side surfaces of the cross member so as to sandwich the cross member.
2. The safety belt attachment device of claim 1. A building with a roof,
The roof is
A cross member,
A sheathing board placed on the cross member;
A roofing material to be placed on the sheathing board;
and a safety belt attachment device according to any one of claims 1 to 4 .
architecture. The roof has a first roof portion extending at an angle from a ridge of the roof, and a second roof portion extending at an angle from the ridge in a direction opposite to the first roof portion,
The first roof portion has a first cross member arranged on the ridge portion,
The second roof portion has a second cross member arranged on the ridge portion,
The safety belt attachment device is fixed to either the first cross member or the second cross member.
The building according to claim 5 . A method for installing a safety belt attachment device for hanging a safety belt on a roof, comprising:
The roof comprises a cross member, a sheathing board placed on the cross member, and a roof material placed on the sheathing board,
The safety belt attachment device comprises an upper fitting with which the safety belt engages, a lower fitting connected to the upper fitting and attached to the cross member , and a fastening member , and the lower fitting has a fixing part fixed to the cross member and a lower connecting part connected to the fixing part and joined to the upper fitting ,
The fixing portion is
A first fixing portion fixed to a lower portion of the cross member;
A second fixing portion fixed to the upper portion of the cross member,
the lower metal fitting is configured by fastening a first part and a second part together with the fastening member,
the first component includes the lower joint portion, the first fixed portion, a first support portion configured to connect the lower joint portion and the first fixed portion and to support the lower joint portion relative to the first fixed portion, and a first fastening portion provided on the first support portion,
the second component includes the second fixing portion, a second fastening portion fastened to the first fastening portion, and a second support portion configured to connect the second fastening portion and the second fixing portion and support the second fastening portion relative to the second fixing portion,
the fastening member fastens the first fastening portion of the first component and the second fastening portion of the second component,
The first part and the second part are configured such that, when the safety belt attachment device is attached to the cross member, the first fastening portion of the first part and the second fastening portion of the second part are positioned above the second fixing portion,
The construction method includes:
a dismantling process of exposing the cross member from the roof by dismantling the sheathing board and the roof material around the attachment portion of the roof to which the safety belt attachment device is attached;
a fixing step of fixing the fixing portion of the lower metal fitting to the cross member from above the roof;
a restoration process for restoring the sheathing boards and the roof material located around the mounting portion dismantled in the demolition process;
a connecting step of connecting the upper fitting to the lower fitting by connecting the upper fitting to the lower joint portion of the lower fitting,
How to install safety belt attachment devices.