JP5001632B2 - Deck plate for fireproof roof, fireproof roof structure and fireproof roof construction method - Google Patents

Description

  The present invention relates to a deck plate for a fireproof roof that is preferably used for a roof part of a building such as a factory, a warehouse, or a supermarket, a fireproof roof structure for a building constructed using the deck plate, and a fireproof roof construction method. It belongs to the technical field, and more specifically, by devising the shape of the deck plate, the deck plate for fireproof roof, fireproof roof structure and fireproof which can be laid with improved waterstop performance as well as fireproof performance. It relates to the roof construction method.

  As shown in Fig. 12, as an example, the fireproof roof structure of a building constructed by using a lightweight and highly supportive deck plate as a roofing material is a steel frame on the top floor of a structural material assembled with steel column beams. A wavy cross-sectional deck plate D having a peak portion a and a valley portion b is laid on the beam 10 in the width direction and the longitudinal direction, and the heat insulating board 11 is fixed on the deck plate D with a tapping screw or the like. It is constructed by being fixed with a tool 13 and further laid with a waterproof sheet 12 on its upper surface (see also FIG. 1 of Patent Document 1 or FIGS. 1 and 5 of Patent Document 2).

  The refractory roof structure constructed using the deck plate D can reduce the weight of the entire building as compared with the case where the deck plate D is used, and the laying work of the deck plate D can be smoothly performed. There is an advantage and it can realize construction cost reduction and construction period shortening, so the social demand is high, and it is currently widely used in buildings such as factories, warehouses and supermarkets.

  By the way, as shown in FIG. 13, the deck plate D has the upper engaging portion c on the same side as the valley portion b with respect to the engaging portions c and d provided at both ends in the width direction. It is a flat shape, and the lower engaging portion d on the other side is carried out in a shape that rises obliquely upward from the end of the bottom surface on the same plane as the valley b. Therefore, the deck plate D having the above-described configuration is subjected to the laying operation in the width direction on the upper surface of the lower engaging portion d on the other side of the left deck plate D laid in advance, as shown in FIG. The upper engagement portion c on one side of the right deck plate D is simply placed from above and overlapped.

Therefore, according to the deck plate D, in the laying operation in the width direction, the engagement portions d and c are secured in order to prevent the upper engagement portion c from separating (raising) and ensuring fire resistance. It is necessary to drive and fix a fixing tool such as a screw at a required interval (see paragraph [0018] of FIG. 3 and FIG. 3), and the workability is poor, and the cost increases accordingly. There was a problem.
Incidentally, as shown in FIGS. 15A to 15C, the longitudinal laying operation of the deck plate D is stopped at the longitudinal end portion of the right deck plate on the longitudinal end portion of the preceding left deck plate D. In order to ensure water performance, they are partly wrapped and overlapped.

Next, in Patent Document 3, as shown in FIGS. 4 and 5 of the same Document 3, although it is a deck plate for floor construction, engaging portions 20 and 21 provided at both ends in the width direction thereof. The technique which can be engaged using is disclosed.
According to this technique, the laying operation in the width direction of the deck plate is suspended by placing the upper engaging portion 20 of the subsequent deck plate on the upper surface of the lower engaging portion 21 of the deck plate laid in advance. It can be implemented in a configuration that does not leave. Therefore, it is possible to prevent the upper engaging portion 20 from being detached upward without using a fixing tool such as a screw.

Japanese Patent No. 3593338 JP 2005-171623 A Japanese Patent Publication No. 3-11341

In general, in order to build a fireproof roof structure, after laying the deck plate, the outer wall work such as attaching the parapet 14 to the outer periphery of the building roof and the drainage groove installation work, etc., the deck plate surface and the parapet 14, The work of laying the heat insulation board 11 and the waterproof sheet 12 on the deck plate can be performed only after the sheet metal work of the ridge in which the periphery of the section and the drainage groove are reinforced with steel plates. The period from laying the deck plate to laying the heat insulation board 11 and the waterproof sheet 12 may require 1 to 2 weeks, or 1 to 2 months if it is long.
For this reason, there is a problem that rainwater leaks downstairs from the connection between the deck plates exposed to the outside.To avoid this problem, the deck plate applied to the fireproof roof structure has fireproof performance. In addition to securing, it is an important point to secure and lay the water.

  However, when the deck plate having the shape disclosed in Patent Document 3 is applied as a roofing material, it is implemented in a bent shape (fitting shape) that can latch the engaging portions 20 and 21 provided at both ends in the width direction. Therefore, in the longitudinal direction, as shown in FIGS. 16A to 16C, the end portions of the deck plate D ′ cannot be overlapped with each other, and they have to be laid to face each other. Therefore, there is a problem that rainwater leaks down the floor from the butt portion in the longitudinal direction, and it is not possible to lay with securing water stop performance.

  That is, in the deck plate D according to FIGS. 12 to 15, although the laying operation in the longitudinal direction can be satisfactorily performed by partially wrapping to ensure the water stopping performance, the laying operation in the width direction is as described above. There is a problem that a fixing tool such as a screw is required and the workability and economical efficiency are impaired. In the deck plate D ′ according to Patent Document 3, although the laying operation in the width direction can be performed well, As described above, the laying work has a problem that the water stop performance cannot be ensured, and there is no deck plate that can achieve a good laying state in both the length and the length direction.

  The object of the present invention is to devise the shape of the engaging portion provided at both ends in the width direction of the deck plate, so that a good laying state can be realized in the width direction without using a fixing tool such as a screw. In the longitudinal direction, a deck plate for a fireproof roof that can be partially wrapped to ensure water-stopping performance and realize a good laying state, a fireproof roof of a building constructed using the deck plate It is to provide a structure and fireproof roof construction method.

As means for solving the above-described background art, the deck plate for a fireproof roof according to the invention described in claim 1 is a deck plate for a fireproof roof laid on a steel beam on the top floor of a building. The deck plate has a corrugated cross-sectional shape having a crest and a trough, and is an engagement portion that is bent upward from the end of the bottom surface on the same plane as the trough at both ends in the width direction. When the upper engaging portion on one side is placed on the lower engaging portion on the other side, the upper engaging portion and the lower longitudinal end portion of the engaging portion, or both ends, the state abutting said upper engaging portions and the lower engaging portions of the two deck plates when laying by partially wrap to overlapping in the longitudinal direction The two deck players Site overlap margin in the overlapping portions of the bets is characterized in that it is cut.

  The invention described in claim 2 is the deck plate for a fireproof roof according to the invention described in claim 1, wherein the lower engaging portion on the lower side when engaged is the trough portion. It is a cross-sectional shape having a rising portion that rises obliquely upward inward from the end of the bottom surface portion on the same surface, and the upper engaging portion on the one side located on the upper side when engaged is the same as the valley portion It has a cross-sectional shape having a latching portion that rises upward from an end portion of the bottom surface portion on the surface and engages the lower engaging portion on the other side.

  The invention described in claim 3 is the deck plate for a refractory roof according to the invention described in claim 1, wherein the lower engaging portion on the lower side when engaged is the trough portion. It is a cross-sectional shape consisting of a rising part that rises obliquely upward inward from the end of the bottom part on the same surface, and a protruding part that protrudes outward from the top edge of the rising part, and is located on the upper side when engaged The upper engaging portion on one side that rises from the end of the bottom surface portion that is flush with the valley portion, rises higher than the lower engaging portion on the other side, and outward from the top end of the rising portion. It has a cross-sectional shape including a protruding portion that protrudes and a C-shaped latching portion that is bent downward and bent from the tip of the protruding portion.

A fourth aspect of the present invention is the deck plate for a fireproof roof according to any one of the first to third aspects of the present invention, wherein the upper engagement portion and the lower engagement portion are unidirectional ends in the longitudinal direction. The dimensions for cutting are both equal lengths and at least about 10 mm.

A fifth aspect of the present invention is the deck plate for a fireproof roof according to any one of the first to fourth aspects of the present invention, wherein one end portion in the longitudinal direction of the upper engagement portion and the lower engagement portion, or Both end portions are cut out including the end portion of the bottom surface portion on the same plane as the trough portion.

In the fireproof roof structure according to the invention described in claim 6, the deck plate for fireproof roof according to any one of claims 1 to 5 is arranged in the width direction and the longitudinal direction on the steel beam on the top floor of the building. Is a fireproof roof structure in which a heat insulation board is fixed on the deck plate, and a waterproof sheet is further laid on the upper surface thereof,
The deck plates adjacent in the width direction are laid so that the engaging portions provided at the end portions in the width direction are hooked to each other,
The deck plates adjacent to each other in the longitudinal direction are in a state in which the engaging portions provided at both ends in the width direction are abutted, and the ridges and valleys excluding the engaging portions are partially overlapped and overlapped It is laid by.

  The invention described in claim 7 is the fireproof roof structure according to the invention described in claim 6, wherein the deck plate is laid in a longitudinal direction so as to form a running water gradient.

  According to an eighth aspect of the present invention, in the fireproof roof structure according to the sixth or seventh aspect of the present invention, the length of the overlapping margin when the deck plates adjacent in the longitudinal direction are overlapped is the longitudinal length of the engaging portion. It is the total of the notch length of the both ends of a direction, It is characterized by the above-mentioned.

The fireproof roof construction method according to the invention described in claim 9 is a fireproof roof construction method for a building. After assembling and joining a structural material such as a steel column beam on a steel beam on the top floor of a building, The deck plate for a fireproof roof according to any one of claims 1 to 5, in the width direction, to a lower engaging portion on one side provided at an end portion in the width direction of the deck plate laid in advance, The other upper engaging portion provided at the end in the width direction of the subsequent deck plate is hooked and laid, and in the longitudinal direction, the subsequent deck plate is placed on the deck plate previously laid, and the engaging portions are connected to each other. And laying the mountain and valleys partly overlapped on the upper surface,
Next, the outer wall construction, drainage groove installation construction and sheet metal construction are performed, and then a heat insulating board is fixed on the laid deck plate, and a waterproof sheet is further laid on the upper surface.

  A tenth aspect of the present invention is the fireproof roof construction method according to the ninth aspect of the present invention, wherein the deck plate is laid with a running water gradient in the longitudinal direction thereof.

  According to the deck plate for refractory roofs according to claims 1 to 5, the laying operation in the width direction is performed on the upper surface of the lower engaging portion 2 of the deck plate 1 laid in advance. Since the upper engagement portion 3 can be placed and latched and not separated upward, the upper engagement portion 3 can be prevented from being separated upward without using a fixing tool such as a screw, and fire resistance performance is achieved. It is possible to realize a good laying state in which In addition, the laying operation in the longitudinal direction is performed such that the end portion of the subsequent deck plate 1 is brought into contact with the end portion of the deck plate 1 previously laid, the engaging portions 2 and 3 are abutted with each other, and the peak portion 4 and the valley portion are Since 5 can carry out in the state which overlapped and overlapped on the upper surface, the favorable installation state which ensured the water stop performance is realizable.

  According to the fireproof roof structure and the fireproof roof construction method according to claims 6 to 10, as described above, the deck plate 1 can be implemented in a good laid state by overlapping in both the width direction and the longitudinal direction. Even if the deck plate 1 is exposed to the outside until the exterior wall construction or drainage installation work is completed, even if the deck plate 1 is exposed to the outside, the deck plate 1 There is no risk of rainwater leaking downstairs from the connection part between the two. Therefore, it is possible to realize a fireproof roof construction method with excellent workability that does not adversely affect the work inside and outside the building and the structural materials such as steel column beams, and a structurally stable fireproof roof structure. .

  The fireproof roof deck plate according to the present invention, the fireproof roof structure of a building constructed using the deck plate, and the fireproof roof construction method are implemented as follows in order to achieve the effects of the invention described above.

  FIG. 1 shows an embodiment of a refractory roof structure according to claim 6. In this fireproof roof structure, a fireproof roof deck plate 1 (see FIG. 2), which will be described in detail later, is laid in the width direction and the longitudinal direction on a steel beam 10 on the top floor of the building. The heat insulating board 11 is fixed by a fixing tool 13 such as a tapping screw, and further a waterproof sheet 12 is laid on the upper surface thereof. The deck plates 1 and 1 adjacent to each other in the width direction are laid so that the engaging portions 2 and 3 provided at the end portions in the width direction are hooked to each other (see FIGS. 3 and 8). On the other hand, the deck plates 1, 1 adjacent to each other in the longitudinal direction are engaged with the engaging portions 2, 3 provided at both end portions in the width direction, and the peak portion 4 excluding the engaging portions 2, 3. And the valley parts 5 are laid in a state of being partially overlapped and overlapped (see FIGS. 4 to 8).

As shown in FIGS. 2A and 2B, the deck plate 1 for a fireproof roof has a corrugated cross-sectional shape including a peak portion 4 and a valley portion 5, and is identical to the valley portion 5 at both ends in the width direction. There are provided engaging portions 2 and 3 that are bent upward from the end of the bottom surface portion 6 on the surface, and the upper engaging portion 3 on one side is placed on the lower engaging portion 2 on the other side. When the upper engagement portion 3 and the lower engagement portion 2 have both end portions (or one end portions) in the longitudinal direction, they are bent so as not to be separated upward (see FIG. 3). When the two lap plates 1 and 1 are laid on top of each other (see symbol W in FIG. 4), the upper engaging portions 3 and 3 and the lower engaging portions 2 and 2 of the two deck plates 1 and 2 are in contact with each other. as will be, sites predetermined dimensions of the overlap margin in the overlapping portions of the two deck plate 1, 1 H only been excised (the invention according to claim 1).

  By the way, the deck plate 1 according to the illustrated example has a thickness of 1.0 mm, a width of 600 mm, a height (mountain height) of 75 mm, and a length of about 1000 cm. The design can be appropriately changed according to the installation interval of the steel beam 10 and the strength required for the structural design. Accompanying this, the number of peaks 4 and valleys 5 can be increased or decreased as appropriate. Moreover, although the cross-sectional shape of the peak part 4 and the trough part 5 of the deck plate 1 which concerns on an example of illustration is implemented by bending a steel plate simply, it is not limited to this, For example, it showed to FIG. As described above, it is also possible to carry out with a cross-sectional shape having an uneven portion to increase the strength.

  Specifically, as shown in FIGS. 2B and 3, the cross-sectional shape of the engaging portions 2 and 3 of the deck plate 1 according to the illustrated example is the lower portion on the other side positioned below when engaged. The engaging portion 2 has a rising portion 2a that rises obliquely upward inward from the end portion of the bottom surface portion 6 that is flush with the valley portion 5, and outward (almost horizontally) from the top end of the rising portion 2a. The upper engaging portion 3 on the one side, which is implemented in a cross-sectional shape composed of a protruding portion 2b and is located on the upper side when engaged, extends from the end portion of the bottom surface portion 6 on the same plane as the valley portion 5. A rising portion 3a that rises higher than the lower engagement portion 2 on the other side (by the thickness of the plate), a protruding portion 3b that protrudes outward from the top end of the rising portion 3a, and a downward bent from the tip of the protruding portion 3b Sectional shape comprising a C-shaped latching portion 3c It is implemented (invention described in claim 3).

  Of course, the cross-sectional shape of the engaging portions 2 and 3 is not limited to FIGS. 2B and 3. For example, as shown in FIGS. 11A to 11E, the upper engaging portion 3 on one side is on the other side. Of the lower engaging portion 2 so as not to be disengaged upward, that is, the lower engaging portion 3 is inward from the end of the bottom surface portion 6 on the same plane as the valley portion 5. The upper engaging portion 3 rises upward from the end of the bottom surface portion 6 on the same plane as the valley 5 and engages the lower engaging portion 2. As long as the cross-sectional shape has a latching portion to be mated, it can be implemented in various variations (the invention according to claim 2).

  In addition, as shown in FIG. 2A, the deck plate 1 according to the present embodiment is cut away at both end portions in the longitudinal direction of the engaging portions 2 and 3 by a required dimension (H) as seen from the plane direction. Has been. The significance of excising the part is that the engaging parts 2 and 3 are bent in such a manner that the cross-sectional shapes of the engaging parts 2 and 3 can be latched with each other. Is formed to form a stacking allowance that can be wrapped in the remaining peaks 4 and valleys 5 (see symbol B in FIG. 2A).

  From the viewpoint of preventing water leakage, it is preferable to cut both ends of the engaging portions 2 and 3 in the longitudinal direction. The overlap margin should be about 10 mm or more that can be reliably wrapped in the longitudinal direction. Incidentally, in this embodiment, it is cut out by about 20 mm (invention according to claim 4). Moreover, although the junction parts 2 and 3 which concern on a present Example are excised including the edge part of the said bottom face part 6, as shown to FIG. 2A and FIG. 3, it implements (Invention of Claim 5). Of course, only the joints 2 and 3 can be excised.

Next, a method for constructing a fireproof roof structure of a building using the deck plate 1 having the above-described configuration will be described.
First, after assembling and joining structural materials such as steel column beams, on the steel beam 10 on the top floor of the building, the same shape and size fireproof roof deck plate 1 of the above-described configuration, in the width direction, As shown in FIG. 3, to the lower engaging portion 2 on one side provided at the end in the width direction of the deck plate 1 laid in advance, the other provided at the end in the width direction of the subsequent deck plate 1 On the other hand, as shown in FIGS. 4 to 7, the upper deck engaging portion 3 on the side is suspended from the upper side, and the subsequent deck plate 1 is engaged with the deck plate 1 laid in advance. The joining portions 2 and 3 are abutted with each other, and the mountain portions 4 and the valley portions 5 are partially overlapped with each other on the upper surface (see reference numeral W) and laid. Thus, as shown in FIG. 8, the deck plates 1 can be connected to each other in the width direction and the longitudinal direction, and can be laid on the uppermost steel beams 10 as a whole.
Next, the outer wall work, drainage groove installation work and sheet metal work are performed, and then, as shown in FIG. 1, the heat insulating board 11 is fixed on the laid deck plate 1 with a fixing tool 13 such as a tapping screw. Further, the waterproof sheet 12 is laid on the upper surface to complete the construction of the fireproof roof of the building (the invention according to claim 9).

The laying of the deck plate 1 will be described from the viewpoint of work. As shown in FIG. 3, the laying work in the width direction is the lower engaging portion 2 on the other side of the deck plate 1 laid in advance. Next, the upper engaging portion 3 on one side of the subsequent deck plate 1 is covered with the opening 3d until the latching portion 3c of the upper engaging portion 3 comes into contact with the rising portion 2a of the lower engaging portion 2. The step of sliding in the width direction and positioning is repeated.
On the other hand, the laying work in the longitudinal direction is about several mm from the top of the overlapping margin formed on the top 4 and trough 5 of the end of the subsequent deck plate 1 on the upper surface of the end of the deck plate 1 laid in advance. And slide until the opposing engaging portions 2 and 3 are in contact with each other (strictly, a step is generated by the thickness of the plate, so that the rising portions 2a and 3a of the engaging portions 2 and 3 are in contact with each other). The positioning process is repeated.
The deck plates 1 are generally laid with a running water gradient in the longitudinal direction thereof (inventions according to claims 7 and 10). In order to prevent water leakage from the overlapping portions (see reference sign W) in the longitudinal direction, it is preferable in terms of work to perform laying work from the vicinity of the drainage groove portion toward the ridge portion (see FIG. 6). Incidentally, there are two types of running water gradients: a case where a step is provided in the arrangement of the steel beam 10 on which the deck plate 1 is laid, and a case where a raising material is provided on the upper surface of the steel beam 10.

  The engaging portions 2 and 3 of the deck plate 1 having the above-described configuration are cut out at both ends in the longitudinal direction by an equal length (about 20 mm in the illustrated example). However, the present invention is not limited to this. For example, the end portions in one direction of the engaging portions 2 and 3 may be cut by 20 mm each, and the end portions in the other direction may be cut by 15 mm each.

  Moreover, although the engaging parts 2 and 3 of the deck plate 1 of the structure mentioned above are implemented in the shape which cut off the both ends of the longitudinal direction, it is not limited to this, As shown to FIG. 9A and B The present invention can also be carried out by laying a shape in which only one of the ends is excised (invention of claim 1).

  Therefore, according to the method for constructing the fireproof roof structure of the building described above, the deck plate 1 for the fireproof roof having the above-described configuration is placed on the steel beam 10 on the top floor of the building. 1 and 1, the engaging portions 2 and 3 provided at the end portions in the width direction are laid and hooked to each other, and the deck plates 1 and 1 adjacent to each other in the longitudinal direction are both ends in the width direction. The engaging parts 2 and 3 provided in the part are abutted with each other, and the mountain part 4 and the valley part 5 excluding the engaging parts 2 and 3 are partly overlapped and laid and overlapped. It is possible to realize a fireproof roof structure in which the heat insulating board 11 is fixed on the deck plates 1 and further the waterproof sheet 12 is laid on the upper surface thereof (the invention according to claim 6).

The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. Note that it includes the range.
For example, in the illustrated example, as shown in FIG. 8A and FIG. 9B, the deck plate 1 having the same shape and size is laid in the width direction and the longitudinal direction. It is also possible to carry out by combining various deck plates 1... In which the lengths of the engaging portions 2 and 3 of the plate 1 to be cut in the longitudinal direction are appropriately changed. However, in this case, both ends of the engaging portions 2 and 3 in the longitudinal direction are adjusted so as to adjust the length W of the overlapping margin when the deck plates 1 and 1 adjacent in the longitudinal direction are overlapped to each other. It is preferable to carry out with the sum of the notch lengths of the portions being constant (the invention according to claim 8).

It is the perspective view which showed the principal part of the fireproof roof structure constructed | assembled using the deck plate which concerns on this invention. A is a plan view showing a deck plate according to the present invention, and B is a front view thereof. It is the perspective view which showed the connection state to the width direction of the deck plate which concerns on this invention. It is the perspective view which showed the connection state to the longitudinal direction of the upper engaging part of the one side of the deck plate which concerns on this invention in steps. It is the perspective view which showed the connection state to the longitudinal direction of the lower engaging part of the other side of the deck plate which concerns on this invention in steps. It is the perspective view which showed the connection state to the longitudinal direction of the deck plate which concerns on this invention. A is a plan view showing a connection state in the longitudinal direction of a deck plate according to the present invention, B is a right side view thereof, and C is a front view thereof. A is the top view which showed the connection state to the width direction and longitudinal direction of the deck plate which concerns on this invention, B is the same front view. A is a plan view showing a different embodiment of the deck plate according to the present invention, and B is a plan view showing a connection state of the deck plate in the width direction and the longitudinal direction. A to C are cross-sectional views showing different examples of the deck plate according to the present invention. A to E are front views showing variations of the engaging portion of the deck plate according to the present invention, the upper row shows the shape of each engaging portion, and the lower row is a state in which the engaging portions are latched to each other. Is shown. It is the perspective view which showed the principal part of the fireproof roof structure constructed | assembled using the deck plate which concerns on a prior art. It is the front view which showed the deck plate which concerns on a prior art. It is the front view which showed the connection state to the width direction of the deck plate which concerns on a prior art. A is a plan view showing a connection state in the longitudinal direction of a deck plate according to the prior art, B is a right side view thereof, and C is a front view thereof. A is a top view which showed the connection state to the longitudinal direction of the different deck plate based on a prior art, B is the right side view, C is the front view.

Explanation of symbols

1 Deck plate 2 Engaging part (lower engaging part)
2a Standing part 2b Protruding part 3 Engaging part (upper engaging part)
3a Standing portion 3b Protruding portion 3c Latching portion 3d Opening portion 4 Mountain portion 5 Valley portion 6 Bottom surface portion 10 Steel beam 11 Thermal insulation board 12 Waterproof sheet 13 Tapping screw 14 Parapet

Claims (10)

In the deck plate for fireproof roof laid on the steel beam on the top floor of the building,
The deck plate has a corrugated cross-sectional shape having a crest and a trough, and is an engagement portion that is bent upward from the end of the bottom surface on the same plane as the trough at both ends in the width direction. When the upper engaging portion on one side is placed on the lower engaging portion on the other side, the upper engaging portion and the lower longitudinal end portion of the engaging portion, or both ends, the state abutting said upper engaging portions and the lower engaging portions of the two deck plates when laying by partially wrap to overlapping in the longitudinal direction A deck plate for a refractory roof, characterized in that the overlapping portion of the overlapping portion of the two deck plates is cut away.   The lower engaging portion on the other side, which is located on the lower side when engaged, has a cross-sectional shape having a rising portion that rises obliquely upward inward from an end portion of a bottom surface portion that is flush with the valley portion, The upper engaging portion on the one side located on the upper side when engaged is a latch that rises upward from an end of the bottom surface on the same plane as the valley and engages the lower engaging portion on the other side. The deck plate for a refractory roof according to claim 1, wherein the deck plate has a cross-sectional shape having a portion.   The lower engaging portion on the other side, which is located on the lower side when engaged, has a rising portion that rises obliquely upward inward from an end of the bottom surface that is flush with the trough, and a top of the rising portion. It has a cross-sectional shape composed of a protruding portion protruding outward from the end, and the upper engaging portion on the one side positioned on the upper side when engaged is from the end portion of the bottom surface portion on the same plane as the valley portion. It comprises a rising portion that rises higher than the lower engaging portion on the other side, a protruding portion that protrudes outward from the top end of the rising portion, and a C-shaped latching portion that is bent downward and bent from the tip of the protruding portion. The deck plate for a refractory roof according to claim 1, wherein the deck plate has a cross-sectional shape. 4. The dimension of cutting the one end portion in the longitudinal direction of the upper engagement portion and the lower engagement portion is the same length, and is at least about 10 mm. 5. Deck plate for fireproof roof described in 1. One end part or both end parts in the longitudinal direction of the upper engaging part and the lower engaging part are cut off including the end part of the bottom face part on the same plane as the valley part. The deck plate for fireproof roofs described in any one of 1-4. The deck plate for a fireproof roof according to any one of claims 1 to 5 is laid in a width direction and a longitudinal direction on a steel beam on the top floor of a building, and a heat insulating board is fixed on the deck plate. Is a fireproof roof structure in which a waterproof sheet is further laid on the upper surface,
The deck plates adjacent in the width direction are laid so that the engaging portions provided at the end portions in the width direction are hooked to each other,
The deck plates adjacent to each other in the longitudinal direction are in a state in which the engaging portions provided at both ends in the width direction are abutted, and the ridges and valleys excluding the engaging portions are partially overlapped and overlapped Fireproof roof structure, characterized by being laid in   The fireproof roof structure according to claim 6, wherein the deck plate is laid in a longitudinal direction so as to form a running water gradient.   The length of the overlap margin when the deck plates adjacent to each other in the longitudinal direction are overlapped is the sum of the cutout lengths at both ends in the longitudinal direction of the engaging portion. The fireproof roof structure described. In building fireproof roof construction method,
After assembling and joining structural materials such as steel column beams, the fireproof roof deck plate according to any one of claims 1 to 5 is placed on the steel beam on the top floor of the building in the width direction. The other side upper engaging portion provided at the widthwise end of the subsequent deck plate is hooked to the one side lower engaging portion provided at the widthwise end of the deck plate laid in advance. Laying and laying in the longitudinal direction the following deck plate to the deck plate that has been laid in advance, with the engaging parts abutting each other, and the ridges and valleys partially overlapped on the top surface ,
Next, exterior wall construction, drainage groove installation construction and sheet metal construction are carried out, and then a heat insulation board is fixed on the laid deck plate, and a waterproof sheet is further laid on the upper surface thereof. Method.   The fireproof roof construction method according to claim 9, wherein the deck plate is laid while forming a running water gradient in a longitudinal direction thereof.

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