Deck roof structure and construction method for deck roof structure

Abstract

The installation location is determined without the need for marking out lines, and the deck plates and tight frames are prevented from shifting before joining. [Solution] A deck roof structure 100 is provided, comprising a deck plate 1 having a plurality of reinforcing ribs 3 and a horizontal section 2 having an upwardly convex mountain-shaped section 24 formed between the reinforcing ribs 3, and a tight frame 70 having a plurality of convex sections 71 on which the deck plate 1 is laid, wherein the deck plate 1 is formed such that the flat plate section 25, which is the horizontal surface of the mountain-shaped section 24, is in contact with the support surface section 73, which is the horizontal surface of the convex section 71 of the tight frame 70, and if the width dimension of the flat plate section 25 is DPw and the width dimension of the support surface section 73 is TFw, then the structure satisfies formula (1). DPw≧TFw ···(1)

Description

Technical Field

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[0001] The present invention relates to a deck roof structure constituting the roof of a building and a method for constructing the deck roof structure.

Background Art

[0002] As a structure using a flat deck plate (roof board) as the roof of a steel-frame building, the one described in Patent Document 1 is known. In the deck roof structure described in Patent Document 1, the deck plate is attached to the frame through a tight frame.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the deck roof structure described in Patent Document 1, the space between the leg-shaped rib portions (reinforcing ribs) of the deck plate has a flat shape. Therefore, when attaching the deck plate to the tight frame, there are no elements that can be positioned in terms of shape, and it is necessary to perform construction while checking the attachment position of the deck plate to the tight frame by means such as layout. Also, before joining the deck plate and the tight frame with a drill screw or the like, and during the joining operation, displacement may occur between the deck plate and the tight frame, and it may not be possible to perform fastening at an appropriate position.

[0005] Therefore, an object of the present invention is to provide a deck roof structure and a method for constructing the deck roof structure that can specify the laying position without performing layout and can prevent displacement between the deck plate and the tight frame before joining.

Means for Solving the Problems

[0006] [1] A deck roof structure comprising: a deck plate having a plurality of reinforcing ribs and a horizontal portion having an upwardly convex mountain-shaped portion formed between the reinforcing ribs; and a tight frame having a plurality of convex portions on which the deck plate is laid, wherein the deck plate is formed such that the flat portion, which is the horizontal surface of the mountain-shaped portion, contacts the support surface portion, which is the horizontal surface of the convex portion of the tight frame, and the width dimension of the flat portion is DPw and the width dimension of the support surface portion is TFw, such that the equation (1) is satisfied. DPw≧TFw ···(1) [2] The deck roof structure according to [1], characterized in that, if the angle between the slanted side adjacent to the flat plate portion of the mountain-shaped portion and the flat plate portion is DPr, the angle between the slanted portion adjacent to the support surface portion of the convex portion and the support surface portion is TFr, the height of the tight frame is TFh, and the height of the deck plate is DPh, then equations (2), (3), and (4) are further satisfied. 0mm ≤ DPw - TFw ≤ 10mm ···(2) 10°≦DPr≦TFr≦90° ···(3) DPh ≤ TFh ···(4) [3] The deck roof structure according to [1] or [2], characterized in that the combined thickness of the deck plate and the tight frame is 7.7 mm or less, and the value obtained by dividing the thickness of the deck plate by the thickness of the tight frame is 0.25 or more and 1.00 or less. [4] The deck roof structure according to [1] or [2], characterized in that the distance in the width direction between the contact surface between the support surface portion of the tight frame and the flat plate portion of the deck plate in the deck roof structure is 150 mm or more and 250 mm or less.

[0007] [5] A method for constructing a deck roof structure, comprising the steps of fixing a tight frame having a plurality of protrusions to a structural body, and laying a deck plate on the tight frame, the deck plate having a plurality of reinforcing ribs and horizontal portions having upwardly protruding mountain-shaped portions formed between the reinforcing ribs, wherein the deck plate is formed such that the flat portion, which is the horizontal surface of the mountain-shaped portion, contacts the support surface portion, which is the horizontal surface of the protrusions of the tight frame, and the tight frame and the deck plate are formed such that equation (1) is satisfied, where DPw is the width dimension of the flat portion and TFw is the width dimension of the support surface portion. DPw≧TFw ···(1) [Effects of the Invention]

[0008] According to the present invention, in the construction of a deck roof structure in which deck plates are laid on a tight frame, the positioning of the deck plates becomes easier, thereby reducing the labor required for construction and enabling the construction of a highly accurate deck roof structure. [Brief explanation of the drawing]

[0009] [Figure 1] This is a front view showing a deck roof structure according to an embodiment of the present invention, viewed horizontally along the longitudinal direction of the deck plate. [Figure 2] This is a cross-sectional view of a deck roof structure with a riser installed between the main frame and the tight frame. [Figure 3] This is a front view of a tight frame according to an embodiment of the present invention. [Figure 4] This is a front view of a deck plate according to an embodiment of the present invention. [Figure 5] This diagram shows how the convex portion of the tight frame contacts the flat portion and the adjacent slanted edge. [Figure 6] This diagram shows a situation where the flat portion of the deck plate is larger than the support surface of the tight frame, resulting in a poor fit. [Figure 7]This is an enlarged view illustrating the angle DPr between the flat portion of the deck plate and the adjacent hypotenuse, and the angle TFr between the inclined surface of the convex portion of the tight frame. [Figure 8] This diagram shows the case where the height TFh of the tight frame is lower than the height DPh of the deck plate 1. [Figure 9] This is a front view of a deck roof structure according to another embodiment. [Figure 10] This is a front view showing a deck roof structure that employs a different method of interlocking deck plates. [Modes for carrying out the invention]

[0010] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. In this specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions will be omitted.

[0011] The deck roof structure of the present invention constitutes the roof of, for example, a steel-framed building and is installed on the structural elements of the building, such as beams and purlins. As shown in Figure 1, the deck roof structure 100 has a tight frame 70 fixed on the structural elements 90 and a deck plate 1 laid on the tight frame 70.

[0012] In this embodiment, the structural frame 90 is an H-shaped steel beam consisting of a flange 91 and a web 92. The H-shaped steel beam extends in a direction perpendicular to the longitudinal direction of the deck plate 1 (the direction along the plane of the paper in Figure 1), and multiple beams are installed at predetermined intervals along the longitudinal direction of the deck plate 1. In addition, as shown in Figure 2, there are cases in which lightweight steel sections or channel steel sections are installed as raising members 93 to match the height level between the structural frame 90 and the tight frame 70.

[0013] As shown in Fig. 1, the tight frame 70 is a fitting for joining the deck plate 1 and the housing 90, and has a base portion 72 joined to the housing 90 and a plurality of convex portions 71 protruding from the base portion 72. As shown in Figs. 1 and 3, the convex portion 71 of the tight frame of the present embodiment has a trapezoidal shape, and has a support surface portion 73 that is in surface contact with the deck plate 1 and an inclined surface adjacent to the support surface portion 73, and a slope surface portion 74 that connects the support surface portion 73 and the base portion 72. The tight frame 70 is formed of, for example, a strip steel or a galvanized iron plate having a width of 30 mm to 100 mm and a plate thickness of 2.3 mm to 4.5 mm. The plate thickness is a plate thickness corresponding to thin plates and medium plates that are easy to bend in consideration of manufacturability.

[0014] The deck plate 1 is bent from a thin steel plate of about 0.8 mm to 1.6 mm that has been subjected to rust prevention treatment such as a hot-dip galvanized steel sheet (JIS G3302), and is a steel plate formed into a rectangular shape in plan view with a predetermined length according to the shape of the building. The length of the deck plate 1 varies depending on the thickness of the steel plate, but generally it is 1.0 m to 13 m.

[0015] As shown in Figs. 1 and 4, the deck plate [1] is composed of a rectangular flat horizontal portion 2, a reinforcing rib 3 protruding vertically (vertically) along the longitudinal direction from one side (lower surface) of the horizontal portion 2, and a pair of left and right fitting ribs 4 and 5 formed along the edges on both sides in the deck plate width direction (horizontal direction orthogonal to the extending direction of the reinforcing rib 3) of the horizontal portion 2 and having a shape that fits together with each other.

[0016] In the deck plate 1 of the present embodiment, only one reinforcing rib 3 protrudes from the center of the horizontal portion 2, and the horizontal portion 2 is divided into a first horizontal portion 21 and a second horizontal portion 22 with this reinforcing rib 3 as a boundary. Of course, a plurality of reinforcing ribs 3 may be provided, and the horizontal portion 2 may also be divided into three or more.

[0017] (Horizontal portion) [[ID=?]] The first horizontal section 21 and the second horizontal section 22 are flat plate-shaped members positioned on the left and right sides of the reinforcing rib 3, and have irregularities formed along their longitudinal direction by being bent to increase bending rigidity and bending strength.

[0018] In the horizontal section 2 according to this embodiment, as shown in Figure 4, two V-shaped ribs 23 are formed on both the first horizontal section 21 and the second horizontal section 22, which have a trapezoidal cross-section and are convex downwards relative to the first horizontal section 21 and the second horizontal section 22, as irregularities to increase bending rigidity and bending strength. The two V-shaped ribs 23 form a V-shaped section 24 on the horizontal section 2 that is convex upwards. The mountain-shaped portion 24 has a horizontal surface, and a flat plate portion 25 is formed between a pair of mountain-shaped ribs 23. Alternatively, both the first horizontal portion 21 and the second horizontal portion 22 may have two mountain-shaped ribs 23 formed thereon, which have a trapezoidal cross-section and are convex upwards relative to the first horizontal portion 21 and the second horizontal portion 22.

[0019] As an example of the irregularities provided on the horizontal section 2, the above-described V-shaped rib 23 was used, but protrusions with a triangular or polygonal cross-section may also be used. In other words, the irregularities provided on the horizontal section 2 may be V-shaped ribs with protrusions or depressions of other shapes, as long as they are irregularities that can be bent along the longitudinal direction to increase bending rigidity and bending strength.

[0020] (Reinforcement ribs) The reinforcing rib 3 is vertically installed in the center of one side of the horizontal section 2 (between the first horizontal section 21 and the second horizontal section 22) and consists of a closed section 30 where two flat steel plates overlap, and a reinforcing rib section 31 with a triangular cross-section formed at the tip of this closed section 30. It has the function of improving the bending rigidity and bending strength of the horizontal section 2 in the longitudinal direction. Although the reinforcing rib section 31 is exemplified as having a triangular cross-section, it may also be in the shape of an inverted T or a polygon.

[0021] (First mating rib) The first fitting rib 4, which is the right-hand fitting rib of the pair of fitting ribs shown in Figure 4, is composed of a flat plate-shaped first web portion 40 that rises perpendicularly to the plane of the first horizontal portion 21, which is in the out-of-plane direction of the horizontal portion 2; an inclined portion 41 (web portion) that slopes downward inward (towards the side close to the reinforcing rib 3, the same applies hereinafter) from the tip of the first web portion 40 in the state shown in Figure 4; a flange portion 42 that is horizontally continuous from the tip of the inclined portion 41; a fitting inclined portion 43 that slopes upward from the tip of the flange portion 42 in the state shown in Figure 4; and a guide inclined portion 44 that slopes in the opposite direction from the fitting inclined portion 43 from the tip of the fitting inclined portion 43.

[0022] This first fitting rib 4 has the function of connecting the deck plates 1 together by fitting with the second fitting rib 5 of the adjacent deck plate 1.

[0023] Furthermore, the corners at the joints of the first web section 40, the inclined section 41, the flange section 42, the fitting inclined section 43, and the guide inclined section 44 are all curved and bent to form rounded corners.

[0024] (Second mating rib) The second fitting rib 5, which is the left fitting rib of the pair of fitting ribs shown in Figure 4, is composed of a flat plate-shaped second web portion 50 that rises perpendicularly to the plane of the second horizontal portion 22, which is out of the plane of the horizontal portion 2; an overhanging inclined portion 51 that slopes inward and downward from the tip of the second web portion 50 in the state shown in Figure 4; and a pressing inclined portion 52 that slopes upward from the tip of the overhanging inclined portion 51 in the state shown in Figure 4.

[0025] Furthermore, the inclination height of the overhang inclined section 51 is higher than the inclination heights of the fitting inclined section 43 and the guide inclined section 44, and the inclination angle of the overhang inclined section 51 is different from the inclination angles of the fitting inclined section 43 and the guide inclined section 44, being gentler than these inclination angles in the state shown in Figure 4.

[0026] As shown in each figure, similar to the first fitting rib 4, the corners of the second web portion 50, the overhanging inclined portion 51, and the pressing inclined portion 52 of the second fitting rib 5 are all curved and bent to form rounded corners.

[0027] Furthermore, as shown in Figure 4, the horizontal distance D1 between the first web portion 40 of the first fitting rib 4 and the point where the inclination of the fitting inclined portion 43, which is its folded portion, begins is approximately equal to the horizontal distance D2 between the outer surface of the second web portion 50 of the second fitting rib 5 and the outer surface of the point where the inclination of the pressing inclined portion 52, which is its folded portion, begins. Therefore, even if there is some error in the machining accuracy of the inclination angles of the fitting inclined portion 43 and the pressing inclined portion 52, the second fitting rib 5 fits snugly into the first fitting rib 4, and the first web portion 40 and the second web portion 50 come into surface contact.

[0028] Next, the detailed shapes of the deck plate 1 and the tight frame 70 will be described. The detailed shapes described below are primarily intended to suppress misalignment of the deck plate 1 and the tight frame 70 during construction.

[0029] The deck plate 1 is formed such that the flat plate portion 25, which is the horizontal surface of the mountain-shaped portion 24, is in surface contact with the support surface portion 73, which is the horizontal surface of the convex portion 71 of the tight frame 70. Regarding the support surface portion 73 of the flat portion 25 and the convex portion 71 of the deck plate 1, the width dimension DPw of the flat portion 25 and the width dimension TFw of the support surface portion 73 are formed to satisfy equation (1). DPw≧TFw ···(1)

[0030] If equation (1) is not satisfied, that is, if the flat portion 25 of the deck plate 1 is smaller than the support surface portion 73 of the convex portion 71, the convex portion 71 of the tight frame 70 will come into contact with the flat portion 25 and the adjacent hypotenuse 26, as shown in Figure 5, and will not be stable. Furthermore, when joining from above with self-drilling screws or the like, out-of-plane deformation will occur in the deck plate 1, or the self-drilling screws may not reach the tight frame 70, making joining difficult. On the other hand, if the flat portion 25 of the deck plate 1 is extremely large, the arrangement will be as shown in Figure 6, and the effect of suppressing misalignment cannot be expected. Therefore, considering the suppression of construction errors and misalignment, it is desirable to use the dimensions within the range of equation (2). 0mm ≤ DPw - TFw ≤ 10mm ···(2)

[0031] Here, according to JIS G 3352 (Deck Plate), the dimensional tolerance for the effective product width of a deck plate is +8 mm, -2 mm. Since a variation of 10 mm in absolute value is possible, the upper limit of DPw-TFw in equation (2) was set to 10 mm.

[0032] As shown in Figure 7, the angle DPr between the flat portion 25 of the deck plate 1 (mountain-shaped portion 24) and the adjacent hypotenuse 26, and the angle TFr between the inclined surface 74 of the convex portion 71 of the tight frame 70 and the support surface 73 are formed to satisfy equation (3). 10°≦DPr≦TFr≦90° ···(3)

[0033] If the angle DPr on the deck plate 1 side is shallow, the effect of suppressing misalignment cannot be expected. Even considering the frictional resistance generated between the deck plate 1 and the tight frame 70 due to the weight of the deck plate 1, it is desirable that the angle DPr on the deck plate 1 side be at least 10° or more. Furthermore, if the angle TFr on the tight frame 70 side is shallower than the angle DPr on the deck plate 1 side, the protrusion 71 of the tight frame 70 will come into contact with the slanted side 26 of the unevenness of the deck plate 1, resulting in an unstable fit. On the other hand, if the angle TFr on the tight frame 70 side is 90° or more, the tight frame will take on an inverted triangular shape, making it impossible to stably support the load of the deck plate 1. Therefore, it is desirable that angles DPr and TFr satisfy equation (3).

[0034] Furthermore, the height TFh of the tight frame 70 shown in Figure 3 and the height DPh of the deck plate 1 shown in Figure 4 must satisfy equation (4). DPh ≤ TFh ···(4)

[0035] If equation (4) is not satisfied, as shown in Figure 8, the reinforcing rib 3 of the deck plate 1 and the base portion 72 of the tight frame 70 will come into contact, so the deck plate 1 will no longer be supported by the flat plate portion 25, making it difficult to position the deck plate 1. Furthermore, when joining from above with self-drilling screws or the like, out-of-plane deformation may occur in the deck plate 1, or the self-drilling screws may not reach the tight frame 70, making joining difficult.

[0036] <Construction method> Next, the construction method for the deck roof structure 100 described above will be explained. The construction method for the deck roof structure includes a tight frame fixing process and a deck plate laying process.

[0037] In the tight frame fixing process, the base portion 72 of the tight frame 70 is fixed to the structural frame 90 by welding, screws, or other appropriate mounting means. In the deck plate laying process, the deck plate 1 is laid on the tight frame 70 such that the support surface portion 73 of the convex portion 71 of the tight frame 70 is in surface contact with the lower surface of the flat portion 25 of the deck plate 1.

[0038] According to the above embodiment, the deck plate 1 of the deck roof structure 100 is formed to satisfy equation (1) (DPw ≥ TFw), which makes it easy to position the deck plate 1 relative to the protrusions 71 of the tight frame 70 when laying the deck plate 1 on the tight frame 70. This reduces labor during construction and makes it possible to construct a highly accurate deck roof structure 100.

[0039] Furthermore, by being formed to satisfy equation (2) (0 mm ≤ DPw - TFw ≤ 10 mm), it is possible to prevent the flat portion 25 of the deck plate 1 from becoming excessively large, thereby preventing the suppression of misalignment. Furthermore, by being formed to satisfy equation (3) (10°≦DPr≦TFr≦90°), it is possible to suppress the loss of the misalignment suppression effect due to the shallow angle DPr on the deck plate 1 side. Furthermore, by being formed to satisfy equation (4) (DPh ≤ TFh), it is possible to prevent the reinforcing ribs 3 of the deck plate 1 from coming into contact with the base portion 72 of the tight frame 70, which would make it difficult to position the deck plate 1.

[0040] <Examples> Next, we will describe the construction tests conducted to verify the feasibility of constructing the deck roof structure described above. In the construction tests, tight frames were fixed to a test stand, and deck plates (or steel plates simulating deck plates) were joined to the fixed tight frames using self-drilling screws. The thickness of the tight frames was chosen to be thin and medium thickness, considering manufacturability and ease of bending. In this construction test, the thickness was less than 6 mm, including the thickest and standard thickness of 4.5 mm.

[0041] <Various dimensions of deck plates and tight frames in construction tests> The width dimensions of the flat section of the deck plate are DPw: 42mm, 45mm. Width dimension of the support surface of the tight frame TFw: 36mm Angle of the hypotenuse of the deck plate: DPr: 20° Tight frame angle TFr: 75° Deck plate height DPh: 90mm Tight frame height TFh: 97mm

[0042] The construction tests were conducted by varying the thickness of the deck plates and tight frames, as well as by changing whether or not pilot holes for self-drilling screws were present. The evaluation methods were jointability (whether or not they could be joined without problems) and walkability (whether or not two adults could walk on them without problems).

[0043] The test results are shown in Table 1. Each item represents the following: DP plate thickness: Thickness of the deck plate TF plate thickness: Thickness of the tight frame Total plate thickness: The sum of DP plate thickness and TF plate thickness. Plate thickness ratio: Value obtained by dividing the DP plate thickness by the TF plate thickness. Pre-drilling: When installing with self-drilling screws, depending on the wire diameter of the self-drilling screws and the thickness and material of the steel plates (in this case, deck plates and tight frames), it may be impossible to install without pre-drilling holes. In this installation test, three patterns were performed: no pre-drilling holes in either the deck plate or the tight frame; pre-drilling holes only in the tight frame; and pre-drilling holes in both the deck plate and the tight frame. Joint Test: The self-drilling screw installation test was performed twice under the same conditions (first test: A, second test: B), and the results were judged according to the following criteria. Note that the overall item shows the worse result of A and B. For example, if the first test was ○ and the second test was ×, the overall rating is ×. ○: Can be joined without any problems. △: Joining is possible by applying force in the axial direction of the screw. ×: Cannot be joined (due to damage to the screw's drill bit, etc.) Walkability: After fastening with self-drilling screws, a walking test was conducted on the deck plate to check its walkability. The results were evaluated according to the following criteria, performed by two individuals of different ages (Mr. A, in his 20s; Mr. B, in his 40s; and Mr. B). ○: Able to walk normally △: Walkable, but requires careful attention to footing. ×: Difficulty walking

[0044] [Table 1]

[0045] The following trends can be observed from Table 1. (1) The greater the total thickness of the plates, the worse the joint will be without pre-drilled holes. (2) A smaller plate thickness ratio (deck plate thickness / tight frame thickness) (thinner deck plate and thicker tight frame) improves workability because the tight frame, which serves as the base when the self-drilling screws are driven in, provides stable reaction force. (3) In all test specimens, there were no problems with walking on the roof.

[0046] Based on the above results, it was confirmed that the following ranges are desirable for the total plate thickness and the plate thickness ratio. Total plate thickness: 4.8mm or less (no pilot holes), 7.7mm or less (with pilot holes) Plate thickness ratio: 0.25 to 0.50 (no pilot hole), 0.25 to 1.00 (with pilot hole)

[0047] Furthermore, the widthwise distance (P in Figure 1) between the flat portion of the deck plate and the support surface of the tight frame during testing was set to 200 mm. As this dimension increases, the deformation between the contact surfaces when walking on the deck plate increases; therefore, a widthwise distance of 150 mm to 250 mm is practically desirable.

[0048] <Other forms> In the above embodiment, the flat plate portion 25 is positioned in the center between adjacent reinforcing ribs 3, and the reinforcing ribs 3 are configured to be located in the center of the recess of the tight frame 70, but this is not the only configuration. For example, as shown in Figure 9, deck plate 1A may have multiple flat plate portions 25A provided between adjacent reinforcing ribs 3, and one of the multiple flat plate portions 25A may be supported by a convex portion 71 of the tight frame 70. Alternatively, the flat plate portion 25A may be formed by a downwardly convex triangular V-shaped rib 23A.

[0049] Furthermore, the method of fitting adjacent deck plates together is not limited to the fitting ribs of the shape described above. For example, it is also possible to use fitting ribs 3A and 35 of the type shown in Figure 10, in which a right-angle bent portion 35 is inserted into a closing portion 30 to fit the deck plates 1 together.

[0050] The fitting ribs 3A and 35 are configured such that a right-angle bent portion 35, provided on the other edge of the horizontal portion 2, is inserted into a reinforcing rib 3A provided on one edge of the horizontal portion 2. The reinforcing rib 3A on one edge in the width direction of the deck plate functions as an insertable reinforcing rib 3A into which the right-angle bent portion 35 is inserted. [Explanation of symbols]

[0051] 100...Deck roof structure, 1...Deck plate, 2...Horizontal section, 3...Reinforcement rib, 4...First fitting rib, 5...Second fitting rib, 21...First horizontal section, 22...Second horizontal section, 23...V-shaped rib, 24...Mountain-shaped section, 25...Flat section, 26...Hypotenuse, 30...Closed section, 31...Reinforcement rib section, 35...Right-angle bend section, 40...First web section, 41...Inclined section, 42...Flange section, 43...Fitting inclined section, 44...Guiding inclined section, 50...Second web section, 51...Overcoming inclined section, 52...Pressing inclined section, 70...Tight frame, 71...Convex section, 72...Base section, 73...Support surface section, 74...Inclined section, 90...Structure, 91...Flange, 92...Web.

Claims

1. A deck plate having multiple reinforcing ribs, with horizontal sections having upwardly convex mountain-shaped portions formed between the reinforcing ribs, A tight frame having multiple protrusions on which the deck plate is laid, The deck plate is formed such that the flat plate portion, which is the horizontal surface of the mountain-shaped portion, contacts the support surface portion, which is the horizontal surface of the convex portion of the tight frame. A deck roof structure characterized by satisfying equation (1), where DPw is the width dimension of the flat plate portion and TFw is the width dimension of the support surface portion. DPw ≥ TFw ... (1)

2. The angle that the hypotenuse adjacent to the flat plate portion of the mountain-shaped portion makes with respect to the flat plate portion is DPr. The angle that the inclined portion adjacent to the support surface of the convex portion makes with respect to the support surface is TFr. The height of the aforementioned tight frame is TFh, If the height of the aforementioned deck plate is DPh, Furthermore, the deck roof structure according to claim 1 is characterized by satisfying formulas (2), (3), and (4). 0 mm ≤ DPw - TFw ≤ 10 mm ... (2) 10° ≤ DPr ≤ TFr ≤ 90° ... (3) DPh ≤ TFh ... (4)

3. The combined thickness of the deck plate and the tight frame is 7.7 mm or less. The deck roof structure according to claim 1 or 2, characterized in that the value obtained by dividing the thickness of the deck plate by the thickness of the tight frame is 0.25 or more and 1.00 or less.

4. The deck roof structure according to claim 1 or 2, characterized in that the distance in the width direction between the contact surface between the support surface portion of the tight frame and the flat plate portion of the deck plate in the deck roof structure is 150 mm or more and 250 mm or less.

5. The process involves fixing a tight frame, which has multiple protrusions, to the building structure, A method for constructing a deck roof structure, comprising the steps of laying a deck plate on a tight frame, the deck plate having multiple reinforcing ribs and horizontal sections with upwardly convex mountain-shaped portions formed between the reinforcing ribs, The deck plate is formed such that the flat plate portion, which is the horizontal surface of the mountain-shaped portion, contacts the support surface portion, which is the horizontal surface of the convex portion of the tight frame. If the width dimension of the flat plate portion is DPw and the width dimension of the support surface portion is TFw, A method for constructing a deck roof structure, characterized in that the tight frame and the deck plate are formed to satisfy formula (1). DPw ≥ TFw ... (1)

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