Rooftop parapet structure

Abstract

To improve the workability while ensuring the continuity of a waterproof layer.SOLUTION: A rooftop parapet structure includes: a peripheral steel beam 20; a rooftop slab 30 supported by the peripheral steel beam 20; a steel parapet 50 attached to the perimeter steel beam 20 and extending above the rooftop slab 30 through the outside of the rooftop slab 30; and a waterproof layer 90 over an upper surface 30U of the rooftop slab 30 and an inner wall surface 50A of the steel parapet 50.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a roof parapet structure. [Background technology]

[0002] 2. Description of the Related Art Precast parapets formed of exterior wall panels made of lightweight aerated concrete (ALC) or precast concrete are known (see, for example, Patent Document 1).

[0003] In the technique disclosed in Patent Document 1, a waterproof layer such as a waterproof sheet is formed on a foundation steel plate (waterproof foundation member) arranged along the inner wall surface of a precast parapet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-079400 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology disclosed in Patent Document 1, the parapet is formed using precast parapets, which eliminates the need for temporary construction and removal of formwork at the site, thereby shortening the construction period.

[0006] However, with the technique disclosed in Patent Document 1, adjacent base steel plates need to be installed without any gaps in order to ensure the continuity of the waterproof layer, which makes installation time-consuming.

[0007] In consideration of the above, the present invention aims to improve the workability of rooftop parapets while ensuring the continuity of the waterproof layer. [Means for solving the problem]

[0008] According to the first aspectThe roof parapet structure comprises an outer perimeter steel beam, a roof slab supported by the outer perimeter steel beam, a steel parapet attached to the outer perimeter steel beam and extending above the roof slab through the outside of the roof slab, and a waterproof layer spanning the upper surface of the roof slab and the inner wall surface of the steel parapet.

[0009] First aspect According to the roof parapet structure described above, the roof slab is supported by the outer perimeter steel beams. A steel parapet is attached to the outer perimeter steel beams. The steel parapet passes outside the roof slab and extends above the roof slab. A waterproof layer is provided across the inner wall surface of the steel parapet and the top surface of the roof slab.

[0010] By forming a rooftop parapet using a steel parapet in this way, there is no need to set up or remove temporary formwork on-site. Therefore, in the present invention, the construction period can be shortened compared to when a rooftop parapet is constructed using a cast-in-place method.

[0011] In addition, the steel parapet can also be used as a formwork for the roof slab, which means that there is no need to temporarily install or remove the formwork for the roof slab, further shortening the construction period.

[0012] Furthermore, adjacent steel parapets can be easily joined by welding, etc. This makes it easy to make the inner wall surfaces of adjacent steel parapets continuous, thus improving the workability of the steel parapet while ensuring the continuity of the waterproof layer.

[0013] According to the second aspect The rooftop parapet structure is According to the first aspect The rooftop parapet structure is provided with a cap wood that is installed at the upper end of the steel parapet and covers the upper end of the waterproof layer.

[0014] Second aspectAccording to the roof parapet structure of the present invention, a cap wood is provided on the upper end of the steel parapet. By covering the upper end of the waterproof layer with this cap wood, it is possible to prevent rainwater from penetrating between the inner wall surface of the steel parapet and the upper end of the waterproof layer.

[0015] In addition, the cap wood can be easily attached to the steel parapet by welding or the like, and the cap wood can be integrated with the steel parapet in advance, which further shortens the construction period.

[0016] According to the third aspect The rooftop parapet structure is First aspect 1 or According to the second aspect The rooftop parapet structure comprises a support member extending outward from the outer perimeter steel beam and an exterior material placed under or outside the steel parapet, wherein the steel parapet is attached to the outer perimeter steel beam via the support member, and the exterior material is attached to at least one of the steel parapet and the support member.

[0017] Third aspect According to the rooftop parapet structure described above, the steel parapet is attached to the outer perimeter steel beams via support members extending outward from the outer perimeter steel beams. Also, exterior materials are placed under or on the outside of the steel parapet. By attaching this exterior material to at least one of the steel parapet and the support members, the exterior material can be easily installed. Effect of the Invention

[0018] As described above, according to the present invention, it is possible to improve workability while ensuring the continuity of the waterproof layer. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is an elevational cross-sectional view showing the roof of a structure to which the roof parapet structure according to the first embodiment is applied. [Diagram 2] 2 is a cross-sectional view taken along line 2-2 of FIG. 1. [Diagram 3]FIG. 2 is an elevation view of the outer perimeter steel beams and steel parapet shown in FIG. 1, viewed from the outside. [Figure 4] FIG. 2 is an elevation view, seen from the outside, of the connection between the steel parapet attached to the outer perimeter steel beams shown in FIG. 1 and the steel parapet attached to the outer perimeter steel columns. [Diagram 5] 5 is a cross-sectional view taken along line 5-5 of FIG. 4. [Figure 6] This is an elevational cross-sectional view showing the roof of a structure to which a roof parapet structure relating to the second embodiment is applied. [Figure 7] This is an elevational cross-sectional view showing the roof of a structure to which a modified example of the roof parapet structure relating to the second embodiment is applied. [Figure 8] 8 is a cross-sectional view taken along line 8-8 in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First embodiment First, the first embodiment will be described.

[0021] (Rooftop parapet structure) 1 shows the roof of a structure 10 to which the roof parapet structure according to the first embodiment is applied. This roof parapet structure comprises a perimeter steel beam 20, a roof slab 30, a steel parapet 50, and a waterproof layer 90.

[0022] (Periphery steel beams) The outer perimeter steel beams 20 constitute the upper outer perimeter beams on the top floor of the structure 10. The outer perimeter steel beams 20 are arranged along the perimeter of the structure 10, and are erected on outer perimeter steel columns 100 (see FIG. 4) described later.

[0023] The periphery steel beam 20 is formed of an H-shaped steel. This periphery steel beam 20 has an upper flange 22 and a lower flange 24 that face each other in the vertical direction, and a web 26 that connects the upper flange 22 and the lower flange 24. This periphery steel beam 20 supports an end 30E of the roof slab 30.

[0024] (Roof slab) The roof slab 30 constitutes the roof floor of the structure 10. This roof slab 30 is made of reinforced concrete, and slab reinforcement (not shown) is embedded inside it. In addition, an end 30E of the roof slab 30 rests on the upper surface 22U of the upper flange 22 of the peripheral steel beam 20. The end 30E of the roof slab 30 provides a fireproof coating to the upper surface 22U of the peripheral steel beam 20.

[0025] Studs (not shown) are embedded in the upper surfaces 22U of the peripheral steel beams 20 at the ends of the roof slab 30. The ends of the roof slab 30 and the peripheral steel beams 20 are joined via the studs. In addition, a steel parapet 50 is provided on the outside of the ends of the roof slab 30.

[0026] (Steel parapet) The steel parapet 50 constitutes the rooftop parapet of the structure 10. This steel parapet 50 is provided in a wall shape along the outer side of the end 30E of the rooftop slab 30. The steel parapet 50 is attached to the outer perimeter steel beams 20 via a plurality of support ribs 40. The support ribs 40 are an example of a support member.

[0027] The multiple support ribs 40 are provided on the outside of the peripheral steel beam 20. The multiple support ribs 40 are formed from steel plates and are arranged at intervals in the material axis direction of the peripheral steel beam 20. The multiple support ribs 40 also extend outward from the upper part of the web 26 of the peripheral steel beam 20. One end of each support rib 40 is joined by welding or the like in a state where it abuts against the surface of the web 26 of the peripheral steel beam 20 and the lower surface of the upper flange 22.

[0028] The support ribs 40 extend outward beyond the upper flanges 22 of the outer periphery steel beams 20. A steel parapet 50 is provided on top of these support ribs 40. The steel parapet 50 extends upward beyond the roof slab 30, passing from the multiple support ribs 40 outside the end 30E of the roof slab 30. The steel parapet 50 has a wall body 60 and a cap wood 70.

[0029] The wall body 60 is formed into a tubular shape with a rectangular cross section when viewed from the material axis direction (arrow Y direction) of the outer peripheral steel beam 20. The wall body 60 has a bottom steel plate 62, an inner steel plate 64, an outer steel plate 66, and a connecting rib 68.

[0030] The bottom steel plate 62 is disposed approximately horizontally on the multiple receiving ribs 40, and is joined to the multiple receiving ribs 40 by welding or the like. An inner steel plate 64 is provided on the inner end of the bottom steel plate 62. The inner steel plate 64 extends upward from the inner end of the bottom steel plate 62, and forms the inner wall surface 50A of the steel parapet 50.

[0031] On the other hand, an outer steel plate 66 is provided on the outer end of the bottom steel plate 62. The outer steel plate 66 extends upward from the outer end of the bottom steel plate 62 and forms the outer wall surface 50B of the steel parapet 50.

[0032] The lower end side of the inner wall surface 50A of the steel parapet 50 also functions as a formwork for the end portion 30E of the roof slab 30. In addition, a plurality of studs 32 are provided on the lower end side of the inner wall surface 50A of the steel parapet 50.

[0033] The multiple studs 32 are spaced apart in the width direction of the steel parapet 50. The multiple studs 32 also protrude inward from the inner wall surface 50A of the steel parapet 50 and are embedded in the end 30E of the roof slab 30. The steel parapet 50 and the end 30E of the roof slab 30 are joined via these studs 32.

[0034] The studs 32 may be provided only if necessary, and may be omitted or replaced with other parts as appropriate.

[0035] The inner steel plate 64 is formed in a rectangular shape when viewed from the thickness direction of the wall body 60. As shown in Fig. 2, the inner steel plates 64 are arranged in the width direction (direction of arrow Y) of the wall body 60. In addition, ends of adjacent inner steel plates 64 are joined to each other via welds W. As a result, the inner wall surfaces 50A of adjacent steel parapets 50 are continuous in the width direction.

[0036] A plurality of outer steel plates 66 are arranged on the outside of the plurality of inner steel plates 64. The plurality of outer steel plates 66 are formed in a rectangular shape when viewed from the thickness direction (arrow X direction) of the wall body 60. The plurality of outer steel plates 66 are also arranged in the width direction of the wall body 60, and face the plurality of inner steel plates 64 in the thickness direction of the wall body 60, respectively.

[0037] Ends of adjacent outer steel plates 66 are joined together via welds W. The inner steel plate 64 and the outer steel plate 66 are connected via a plurality of connecting ribs 68. The connecting ribs 68 are an example of a connecting member.

[0038] The connecting rib 68 is made of a steel plate. The connecting rib 68 is disposed between the inner steel plate 64 and the outer steel plate 66 along the thickness direction (arrow X direction) of the wall body 60. The connecting rib 68 is disposed across the welded portion W of the adjacent inner steel plate 64 and the welded portion W of the adjacent outer steel plate 66, and both ends of the connecting rib 68 are joined to the inner steel plate 64 and the outer steel plate 66 via the welded portion (fillet welded portion) W.

[0039] Note that backing steel plates 69 for welding are provided on the inner surfaces of the inner steel plate 64 and the outer steel plate 66. In addition, as shown in Fig. 3, the multiple connecting ribs 68 are disposed above the multiple receiving ribs 40, respectively.

[0040] 1, a cap wood 70 is provided on the inner steel plate 64 and the outer steel plate 66. The cap wood 70 is formed of a steel plate. The cap wood 70 is disposed approximately horizontally and spans the upper end of the inner steel plate 64 and the upper end of the outer steel plate 66. The cap wood 70 is welded to the upper end of the inner steel plate 64 and the upper end of the outer steel plate 66, respectively.

[0041] The cap piece 70 has an inner protruding portion 70A that protrudes inward from the upper end of the inner steel plate 64. This inner protruding portion 70A covers an upper end 90E of a waterproof layer 90, which will be described later, from above.

[0042] An exterior material 80 that constitutes the outer wall of the structure 10 is disposed beneath the steel parapet 50. The exterior material 80 is disposed between adjacent support ribs 40, and is attached to the bottom steel plate 62 of the steel parapet 50 via brackets 82.

[0043] (waterproof layer) The waterproof layer 90 is formed of, for example, a waterproof sheet. The waterproof layer 90 is provided across the upper surface 30U of the roof slab 30 and the inner wall surface 50A of the steel parapet 50, and waterproofs the upper surface 30U of the roof slab 30 and the inner wall surface 50A of the steel parapet 50.

[0044] More specifically, the waterproof layer 90 is provided along the upper surface 30U of the roof slab 30, covering the upper surface 30U of the roof slab 30. The waterproof layer 90 is also bent upward along the corner between the end portion 30E of the roof slab 30 and the steel parapet 50. This waterproof layer 90 is disposed along the inner wall surface 50A of the steel parapet 50, covering the inner wall surface 50A of the steel parapet 50.

[0045] The upper end 90E of the waterproof layer 90 reaches directly below the inner protruding portion 70A of the cap wood 70, and is covered from above by the inner protruding portion 70A. This inner protruding portion 70A prevents rainwater from penetrating into the gap between the upper end 90E of the waterproof layer 90 and the inner wall surface 50A of the steel parapet 50.

[0046] (supplement) Next, we will provide some additional information regarding the steel parapets on the outer steel columns.

[0047] As shown in Fig. 4, the outer periphery steel column 100 is formed of, for example, a square steel pipe. The end of the outer periphery steel beam 20 is joined to the column head (column-beam joint) of the outer periphery steel column 100. The above-mentioned steel parapet 50 is attached to the outer periphery steel beam 20.

[0048] A through diaphragm 102 is provided at the upper end of the column capital portion 100H of the peripheral steel column 100. A steel parapet 50R is provided on top of this through diaphragm 102. The steel parapet 50R has the same structure as the steel parapet 50.

[0049] Adjacent steel parapets 50, 50R are connected via a connecting piece 120. A connecting cover 122 that covers the connecting piece 120 is placed over the connecting portion of adjacent steel parapets 50, 50R.

[0050] 5, the connecting piece 120 is formed, for example, from a square steel pipe, and is disposed with its axial direction aligned with the width direction of the steel parapet 50. Both ends of the connecting piece 120 are inserted into the steel parapets 50, 50R, respectively.

[0051] In addition, annular seal materials 124 are provided on the outer peripheral surfaces at both ends of the connecting piece 120. The seal materials 124 seal the gaps between the outer peripheral surfaces of the connecting piece 120 and the inner steel plate 64 and the outer steel plate 66 of each steel parapet 50, 50R.

[0052] (action) Next, the operation of the first embodiment will be described.

[0053] As shown in Fig. 1, according to this embodiment, an end 30E of the roof slab 30 is supported by an outer periphery steel beam 20. A steel parapet 50 is attached to this outer periphery steel beam 20. The steel parapet 50 passes outside the roof slab 30 and extends above the roof slab 30. A waterproof layer 90 is provided across an inner wall surface 50A of the steel parapet 50 and an upper surface 30U of the roof slab 30.

[0054] By forming a rooftop parapet using the steel parapet 50 in this way, temporary installation and removal of formwork at the site is not required, and therefore the number of man-hours at the site (workshop) is reduced. Therefore, in this embodiment, the construction period can be shortened and costs can be reduced compared to the case of constructing a rooftop parapet using a cast-in-place construction method.

[0055] The steel parapet 50 can also be used as a formwork for the roof slab 30. This eliminates the need for temporary installation and removal of the formwork for the roof slab 30, reducing the number of man-hours on-site (workshop). This further shortens the construction period.

[0056] Furthermore, adjacent steel parapets 50 can be easily joined by welding or the like. More specifically, as shown in Fig. 2, the inner steel plates 64 of adjacent steel parapets 50 are joined via welds W. This makes it possible to easily make the inner wall surfaces 50A of adjacent steel parapets 50 continuous in the width direction. Therefore, the workability of the steel parapet 50 can be improved while ensuring the continuity of the waterproof layer 90 in the width direction of the steel parapet 50.

[0057] In addition, a cap wood 70 is provided at the upper end of the steel parapet 50. The inward protruding portion 70A of this cap wood 70 covers the upper end 90E of the waterproof layer 90 from above, thereby preventing rainwater from penetrating between the inner wall surface 50A of the steel parapet 50 and the upper end 90E of the waterproof layer 90.

[0058] Furthermore, the cap wood 70 can be easily attached to the steel parapet 50 by welding or the like, and the cap wood 70 can be integrated in advance with the steel parapet 50. This further shortens the construction period.

[0059] In addition, an exterior material 80 is disposed under the steel parapet 50. By attaching this exterior material 80 to the bottom steel plate 62 of the steel parapet 50, the exterior material 80 can be easily installed.

[0060] Second Embodiment Next, a second embodiment will be described. In the second embodiment, the same reference numerals will be used to designate the same members as in the first embodiment, and the description thereof will be omitted as appropriate.

[0061] 6 shows the roof of a structure 10 to which a roof parapet structure according to the second embodiment is applied. In this roof parapet structure, a steel parapet 50 is attached to an outer periphery steel beam 20 via multiple supporting steel beams 130. The supporting steel beams 130 are an example of a supporting member.

[0062] The multiple support steel beams 130 are provided on the outside of the periphery steel beams 20. The multiple support steel beams 130 are formed, for example, from T-shaped steel, and are arranged at intervals in the material axis direction of the multiple periphery steel beams 20. Each support steel beam 130 extends outward from an upper portion of the web 26 of the periphery steel beam 20.

[0063] The support steel frame 130 has a lower flange 132 and a web 134 extending upward from the upper surface of the lower flange 132. This support steel frame 130 is disposed in a direction perpendicular to the periphery steel beam 20, and one end of the support steel frame 130 is joined by welding or the like in a state where it abuts against the web 26 of the periphery steel beam 20.

[0064] The supporting steel beams 130 extend outward beyond the upper flanges 22 of the outer periphery steel beams 20. A steel parapet 50 is provided at the tip ends of these supporting steel beams 130. The bottom steel plate 62 of the steel parapet 50 is joined to the upper ends of the webs 134 of the supporting steel beams 130 by welding or the like. The steel parapet 50 extends upward beyond the roof slab 30, passing from the tip ends of the multiple supporting steel beams 130 outside the end 30E of the roof slab 30.

[0065] Furthermore, the steel parapet 50 is positioned away from the outer periphery steel beam 20 in accordance with the extension amount of the supporting steel 130 extending outward from the outer periphery steel beam 20. As a result, the end 30E of the roof slab 30 protrudes outward beyond the outer periphery steel beam 20, reaching the inner wall surface 50A of the steel parapet 50. The bottom steel plate 62 of the steel parapet 50 extends inward from the lower end of the steel parapet 50, reaching the upper flange 22 of the outer periphery steel beam 20.

[0066] An exterior material 80 is disposed on the outside of the steel parapet 50. The exterior material 80 constitutes the outer wall of the structure 10. This steel parapet 50 is attached to a lower flange 132 of a supporting steel frame 130 via a bracket 82.

[0067] The cap wood 70 of the steel parapet 50 is provided with an outer protruding portion 70B that protrudes outward from the upper end of the wall body 60. The outer protruding portion 70B covers the upper end 80E of the exterior material 80 from above. This outer protruding portion 70B prevents rainwater from penetrating between the outer wall surface 50B of the steel parapet 50 and the upper end 80E of the exterior material 80.

[0068] (action) Next, the operation of the second embodiment will be described.

[0069] According to this embodiment, an exterior material 80 is disposed on the outside of the steel parapet 50. This exterior material 80 is attached to the supporting steel frame 130 via brackets 82, so that the exterior material 80 can be easily installed.

[0070] In addition, by increasing or decreasing the amount of extension of the supporting steel frame 130 extending outward from the outer periphery steel beams 20 depending on the position of the exterior material 80, the exterior material 80 can be easily attached to at least one of the steel parapet 50 and the supporting steel frame 130.

[0071] Furthermore, a cap wood 70 is provided on the upper end of the steel parapet 50. The outer protruding portion 70B of the cap wood 70 covers the upper end 80E of the exterior material 80 from above, thereby preventing rainwater from penetrating between the upper end 80E of the exterior material 80 and the outer wall surface 50B of the steel parapet 50.

[0072] In this embodiment, the inner steel plate 64 and the outer steel plate 66 of the steel parapet 50 are connected via a connecting rib 68. However, the inner steel plate 64 and the outer steel plate 66 may be connected via, for example, a shaped steel as a connecting member.

[0073] For example, in the modified example shown in Figures 7 and 8, the inner steel plate 64 and the outer steel plate 66 are connected via a plurality of channel steel (C-shaped steel) 140. As shown in Figure 8, the channel steel 140 has a pair of flanges 142 facing each other in the thickness direction of the steel parapet 50, and a web 144 connecting the pair of flanges 142. The channel steel 140 is an example of a connecting member.

[0074] The channel steel 140 is arranged across the welded portion W of the adjacent inner steel plate 64 and the welded portion W of the adjacent outer steel plate 66, and a pair of flanges 142 are joined to the inner steel plate 64 and the outer steel plate 66 via the welded portion (fillet weld portion) W.

[0075] By connecting the inner steel plate 64 and the outer steel plate 66 with the channel steel 140 in this manner, the backing steel plate 69 (see FIG. 2) can be omitted.

[0076] (Modification) Next, modified examples of the first embodiment and the second embodiment will be described. Note that, although various modified examples will be described below using the first embodiment as an example, these modified examples can also be appropriately applied to the second embodiment.

[0077] In the above first embodiment, the steel parapet 50 is attached to the periphery steel beam 20 via a plurality of support ribs 40. However, the steel parapet 50 may be attached directly to the periphery steel beam 20. In other words, the steel parapet 50 can be attached directly or indirectly to the periphery steel beam 20.

[0078] In the first embodiment, the cap wood 70 is provided at the upper end of the steel parapet 50. However, the cap wood 70 may be provided as necessary and may be omitted as appropriate. If the cap wood 70 is omitted, a top steel plate may be provided in place of the cap wood 70 to close the space between the inner steel plate 64 and the outer steel plate 66 of the steel parapet 50.

[0079] In the first embodiment, the exterior material 80 is attached to the steel parapet 50. However, the exterior material 80 can be attached to at least one of the steel parapet 50 and the support rib 40. In other words, the exterior material can be attached to at least one of the steel parapet and the support member.

[0080] In the first embodiment, the waterproof layer 90 is formed of a waterproof sheet. However, the waterproof layer 90 is not limited to a waterproof sheet, and may be formed of, for example, asphalt waterproofing or urethane waterproofing, or may be formed by appropriately combining the waterproof sheet (sheet waterproofing), asphalt waterproofing, and urethane waterproofing.

[0081] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0082] 20 Periphery steel beam 30 Roof slab 30U top surface (top surface of roof slab) 40 Support rib (support member) 50 Steel Parapet 50A Inner wall surface (inner wall surface of steel parapet) 50R Steel Parapet 70 Cap Wood 80 Exterior materials 90 waterproof layer 130 Support steel frame (support member) 140 Channel steel (support member)

Claims

1. The perimeter steel beams and A roof slab supported by the outer perimeter steel beams; A steel parapet attached to the outer periphery steel beam, passing through the outside of the roof slab and extending above the roof slab, and serving as a formwork for the roof slab; A waterproof layer extending over the upper surface of the roof slab and the inner wall surface of the steel parapet; A rooftop parapet structure equipped with:

2. A cap wood is provided at the upper end of the steel parapet and covers the upper end of the waterproof layer. The rooftop parapet structure according to claim 1.

3. A support member extending outward from the outer periphery steel beam; An exterior material disposed under or outside the steel parapet; Equipped with The steel parapet is attached to the outer perimeter steel beam via the support member, The exterior material is attached to at least one of the steel parapet and the receiving member. The rooftop parapet structure according to claim 1 or 2.

Images