WO2019156148A1 - Deck plate - Google Patents

Abstract

Provided is a deck plate having higher cross-sectional performance than conventional deck plates. A deck plate (10) which is formed from a metal plate and on which surface sections (3) and ribs (1, 2) are continuously and alternately formed has formed thereon ridges (4) protruding toward one surface side. The ratio of the length, in a width direction, of portions other than the ridges to the length, in the width direction, of the surface sections is in the range of 0.5 to 0.7.

Description

Deck plate

The present invention relates to a deck plate used for construction of a floor slab or a ceiling slab.

Deck plates are widely used in building floor slabs and ceiling slabs of building structures. The deck plate is installed so as to be bridged between the beams, and both end portions of the deck plate are fixed to the upper surface of the beam. After the deck plate is fixed, concrete is placed on the deck plate, and the concrete is solidified to construct a floor structure or a ceiling structure.
The deck plate is formed by bending a metal plate by roll forming or the like. The deck plate is formed with ribs for increasing rigidity (see, for example, Patent Document 1).

JP 2017-122014 A

In the above-mentioned Patent Document 1, a flat ridge portion whose upper surface protrudes upward is formed on the flat portion formed between the ribs, and the cross-sectional performance and buckling strength of the entire deck plate can be improved. It can be done.
However, even if such protrusions are formed on the flat surface, there is a limit to improving the performance. Specifically, in the deck plate, the deflection coefficient C used in the deflection calculation formula is normally calculated as 1.6, but in the deck plate in Patent Document 1, the deflection coefficient C is improved to 1.33. However, there is a demand for further improving the cross-sectional performance. In addition, forming a large number of protrusions to improve the cross-sectional performance of the deck plate leads to an increase in the weight of the deck plate, so an optimal number of protrusions are formed to suppress an increase in the weight of the deck plate. Is desired.
Here, the deflection amount of the deck plate is calculated by using the second moment of section which makes the whole area of the cross section of the deck plate effective, and the deflection coefficient C takes into account the effective working area of the deck plate. This is a correction coefficient that anticipates the effect of reduced rigidity. As described above, the deflection coefficient C of the deck plate is normally C = 1.6.
The deflection calculation formula is δ for deflection, C for deflection, W for vertical load during construction, L for span length, E for Young's modulus, and secondary moment of inertia for all areas of deck plate cross section. If I is I,
δ = C {5WL ⁴ / (384EI)}
It becomes.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a deck plate capable of suppressing a significant increase in weight while improving cross-sectional performance as compared with the conventional art.

In order to solve the above-described problems, the present invention is a deck plate formed of a metal plate and having surface portions and ribs formed alternately and continuously, and the surface portion protrudes toward one surface side. The ratio of the length other than the protrusion in the width direction to the length in the width direction of the surface part is in the range of 0.5 to 0.7. To do.

Further, it is preferable to form the same number of the surface portions and the ribs.

Moreover, it is preferable that the protrusions are formed side by side with a predetermined interval in the width direction.

Further, it is preferable that a locking portion is formed on a surface portion on one end side in the width direction, and a receiving portion for receiving the locking portion is formed on a rib on the other end side in the width direction.

Further, the length of the surface portion in the width direction is preferably 180 to 220 mm.

The width of the protrusion is preferably 20 to 25 mm.

The height of the protrusion is preferably 4 to 8 mm.

Further, the distance between the centers of the rib and the ridge adjacent to the rib is preferably 20 to 50 mm.

Further, the distance between the centers of the adjacent ridges is preferably 30 to 60 mm.

Further, the bending radius of the curved portion of the metal plate in the protruding portion is preferably 3 to 5 mm.

Further, it is preferable that 3 to 5 protrusions are formed per one surface portion.

According to the present invention, it is possible to suppress a significant increase in weight while improving the cross-sectional performance of the deck plate as compared with the conventional one.

It is a figure which shows the deck plate installed between the beams in 1st Embodiment. It is a perspective view of a deck plate in a 1st embodiment. It is sectional drawing of the deck plate in 1st Embodiment. It is an expanded sectional view of a protrusion part in a 1st embodiment. In (a) in the first embodiment, the horizontal axis represents the ratio of the length other than the protrusions to the length in the width direction of the surface portion, and the vertical axis represents the rate of increase in the effective cross-section secondary moment. It is a graph. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. (A) in the first modification of the first embodiment, the horizontal axis represents the ratio of the length other than the ridge portion to the length in the width direction of the surface portion, and the vertical axis represents the increase in effective cross-section secondary moment. It is the graph which took the rate. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. (A) in the second modification of the first embodiment, the horizontal axis represents the ratio of the length other than the ridge to the length in the width direction of the surface portion, and the vertical axis represents the increase in the effective cross-section secondary moment. It is the graph which took the rate. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. It is sectional drawing of the deck plate in 2nd Embodiment. It is an expanded sectional view of a protrusion part in a 2nd embodiment. (A) in 2nd Embodiment took the ratio of length other than a rib part with respect to the length of the width direction of a surface part on a horizontal axis, and took the increase rate of the effective cross-section secondary moment on the vertical axis | shaft. It is a graph. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. In the first modification of the second embodiment, (a) shows the ratio of the length other than the ridge to the length in the width direction of the surface portion on the horizontal axis, and the increase in the effective moment of inertia on the vertical axis. It is the graph which took the rate. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. (A) in the second modification of the second embodiment, the horizontal axis represents the ratio of the length other than the protrusions to the length in the width direction of the surface portion, and the vertical axis represents the increase in effective cross-section secondary moment. It is the graph which took the rate. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. In the third modification of the second embodiment, (a) shows the ratio of the length other than the ridge to the length in the width direction of the surface portion on the horizontal axis, and the increase in the effective section secondary moment on the vertical axis. It is the graph which took the rate. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. In the modified example 4 of the second embodiment, (a) shows the ratio of the length other than the projecting portion with respect to the length in the width direction of the surface portion on the horizontal axis, and the increase in the effective section secondary moment on the vertical axis. It is the graph which took the rate. In (b), the horizontal axis represents the ratio of the length other than the ridges to the length in the width direction of the surface portion, and the vertical axis represents the ratio between the increase rate of the effective sectional secondary moment and the weight increase rate of the deck plate. It is a graph taken. (C) is a graph that summarizes the graphs of (a) and (b) into one, and shows a range with excellent cross-sectional performance. It is a figure which shows the deck plate installed between the beams toward the upper surface (concrete side) in which the rib is formed. It is a figure which shows the deck plate installed between the beams over several spans.

Preferred embodiments of the present invention will be described with reference to the drawings. The following embodiment is merely an example, and various embodiments can be employed within the scope of the present invention.

1. First Embodiment A configuration of a deck plate 10 according to a first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a view showing a deck plate installed between beams. FIG. 2 is a perspective view of the deck plate. FIG. 3 is a cross-sectional view of the deck plate. FIG. 4 is an enlarged cross-sectional view of the protrusion.
As shown in FIGS. 1 to 3, the deck plate 10 becomes a concrete formwork placed when a floor structure (or ceiling structure) of a building structure is constructed.

<Configuration of deck plate>
As shown in FIG. 1, the deck plate 10 is bridged between the beams 20 facing each other. The deck plate 10 has one end placed on one beam 20 and fixed to the beam 20 by welding or the like, and the other end placed on the other beam 20 and fixed to the beam 20 by welding or the like. Specifically, the beam 20 is made of, for example, H-shaped steel, and each end portion of the deck plate 10 is placed on and fixed to a flange portion of the H-shaped steel constituting each beam 20.

As shown in FIGS. 2 and 3, the deck plate 10 is formed of a thin steel plate that has been subjected to a surface treatment such as galvanization. The deck plate 10 is manufactured, for example, by roll-forming a flat steel plate with a roll forming machine. The deck plate 10 is bent at a plurality of locations by a roll forming machine. Here, the thickness of the deck plate 10 is preferably 0.6 to 1.6 mm. In the present embodiment, the thickness of the deck plate 10 is 0.8 mm.
The deck plate 10 includes two ribs 1, 2, a surface portion 3, a protruding portion 4, a locking portion 5, and an end closing portion 6.

(rib)
As shown in FIG. 3, the rib 1 is formed by bending a steel plate. The rib 1 is continuous to the curved portion 11 bent to one surface side of the steel plate, the curved portion 11, the linear portion 12 extending in a direction perpendicular to the surface portion 3, and the linear portion 12. The folded portion 13 that is bent and folded over a plurality of times, the folded portion 13 is continuous, the straight portion 14 is extended so that the surface direction is along the straight portion 12, the straight portion 14 is continued, and the surface portion 3 is And a bending portion 15 bent toward the front.
The bending portion 11 and the bending portion 15 are formed so that the bending radius R thereof is 4 to 10 mm, for example, about 6 mm. This is because bending by roll forming is relatively easy, and it is possible to prevent the waste of concrete from occurring due to an unnecessarily large depression formed between the curved portions 11 and 15.
The straight line portion 12 and the straight line portion 14 are formed so that their surfaces come into contact with each other, and are connected by caulking or the like. As a result, the straight portion 12 and the straight portion 14 are not separated.
The folded portion 13 is formed in a substantially triangular shape in sectional view, and is folded so that the start point and the end point are adjacent to each other so that the straight portion 12 and the straight portion 14 come into contact with each other.

As shown in FIG. 3, the rib 2 is formed by bending a steel plate. The rib 2 is continuous to the curved portion 21 bent to one surface side of the steel plate, the curved portion 21, the straight portion 22 extending in a direction perpendicular to the surface portion 3, and the straight portion 22. The folded portion 23 that is bent and folded over a plurality of times, the straight portion 24 that continues to the folded portion 23, the surface direction extends along the straight portion 22, the continuous straight portion 24, and the straight portion 22. In the direction away from the inclined surface 25 inclined toward the surface portion 3, continuous to the inclined portion 25, and continuous to the straight portion 26, the surface direction extending along the straight portion 22, and continuous to the straight portion 26. And a curved portion 27 bent toward the surface portion 3.

The bending portion 21 and the bending portion 27 are formed so that the bending radius R thereof is 4 to 10 mm, for example, about 6 mm. This is because bending by roll forming is relatively easy, and it is possible to prevent the waste of concrete from occurring due to an unnecessarily large depression formed between the curved portions 21 and 27.
The straight line portion 22 and the straight line portion 24 are formed so that their surfaces come into contact with each other, and are connected by caulking or the like. As a result, the straight portion 22 and the straight portion 24 are not separated.
The folded portion 23 is formed in a substantially triangular shape in sectional view, and is folded so that the start point and the end point are adjacent to each other so that the straight portion 22 and the straight portion 24 come into contact with each other.
The inclined portion 25 is for forming a gap between the straight portion 22 and the straight portion 26. Due to the presence of the inclined portion 25, the gap formed between the straight portion 22 and the straight portion 26 is reduced. The locking part 5 can be inserted as the receiving part 50 of the locking part 5.

The deck plate 10 is formed with two ribs 1 and 2. The rib 1 and the rib 2 are spaced from each other at a distance of 180 to 220 mm along the width direction (short direction) of the deck plate 10 (between the centers). ). Specifically, the deck plate 10 is formed such that the length L in the width direction is 360 to 440 mm, and the rib 1 extends from one end in the width direction of the deck plate 10 to the center of the rib 1 (straight with the straight portion 12). The distance L1 to the boundary surface with which the portion 14 comes into contact is set to be 180 to 220 mm. The rib 2 is formed such that a distance L2 from the center of the rib 1 to the center of the rib 2 (the boundary surface where the straight portion 22 and the straight portion 24 abut on the center of the rib 2) is 180 to 220 mm. Has been. That is, the rib 1 is formed near the center of the deck plate 10 in the width direction, and the rib 2 is formed near the end of the deck plate 10 in the width direction. Here, it is preferable that the distance L1 and the distance L2 are equal, and in the first embodiment, the distance L1 is formed to be L2 = 200 mm and L = 400 mm. That is, the length in the width direction of each plane portion 3 is 200 mm, which is the same as L1 and L2.
The ribs 1 and 2 are formed so as to extend along the length direction (longitudinal direction) of the deck plate 10. That is, the ribs 1 and 2 are continuously formed from one end to the other end along the direction of suspension to the beam 20.
The ribs 1 and 2 are preferably formed such that the height from the lower end to the upper end (upper surface) of the surface portion 3 is 75 to 100 mm. In the first embodiment, the height H1 is formed to be H1 = 100 mm.

(Face part)
As shown in FIG. 3, the surface portion 3 is a portion of the deck plate 10 where the ribs 1 and 2 are mainly not formed, and is a surface that mainly receives the load of the concrete to be placed. The surface portion 3 is formed next to the ribs 1 and 2 in the width direction of the deck plate 10. That is, in the deck plate 10, the ribs 1 and 2 and the surface portion 3 are alternately formed. In the deck plate 10, the surface portions 3 are formed on the same plane.
In the first embodiment, the two ribs 1 and 2 and the two surface portions 3 are formed, but it is preferable to form the same number of ribs and surface portions. In particular, it is preferable to form one to three ribs and one surface portion on each deck plate.

(Projection)
As shown in FIGS. 3 and 4, the protrusion 4 is formed by bending a steel plate. The protrusion 4 is formed so as to protrude toward the surface where the ribs 1 and 2 are formed in the surface 3. Thereby, the surface part 3 becomes a surface where a flat part and a trough part (mountain part when it sees from the other side) continue alternately.
A plurality of protrusions 4 are formed side by side along the width direction of the deck plate 10, and for example, three protrusions 4 are formed per one surface portion 3. Here, as shown in FIG. 3, the protrusion 4 has a ratio r1 of the length (L4 + L5 + L6 + L7) other than the protrusion 4 in the width direction to the length L1 in the width direction of the surface 3a of the deck plate 10 is 0. The number and size of the protrusions 4 are determined so as to be in the range of 0.5 to 0.7. Also in the surface portion 3b of the deck plate 10, the ratio r2 of the length (L8 + L9 + L10 + L11) other than the protruding portion 4 in the width direction to the length L2 in the width direction of the surface portion 3b is in the range of 0.5 to 0.7. As described above, the number, width, and depth of the protrusions 4 are determined. More specifically, the number of the protrusions 4 depends on the width thereof, but is preferably limited to 3 to 5 per one surface portion 3 (3a, 3b), for example. The protruding portion 4 is formed so as to extend along the longitudinal direction of the deck plate 10.

As shown in FIG. 4, the protruding portion 4 has a width B of 20 to 25 mm along the width direction of the deck plate 10 and a height H2 (the portion of the portion that protrudes from the bottom surface of the surface portion 3 to the side closest to the ribs 1 and 2). The length to the outer surface is preferably 4 to 8 mm. The protrusion 4 is formed such that a valley 41 formed in the center in the width direction is deepest, and has inclined surfaces 42 having the same inclination on both sides in the width direction from the valley 41. The protrusion 4 is preferably formed so that the bending radius R of the curved portion 43 (boundary portion and trough portion with the surface portion 3) where the metal plate is curved is 3 to 5 mm.

As shown in FIG. 3, among the ridges 4 formed on the surface portion 3 a between one end of the deck plate 10 and the rib 1, the ridge closest to one end of the deck plate 10 from one end of the deck plate 10. The distance L4 to the portion 4a is preferably 17.5 to 35 mm. In the first embodiment, for example, when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the distance L4 is 32.5 mm. Further, the distance L5 from the protrusion 4a to the protrusion 4b adjacent to the protrusion 4a and the distance L6 from the protrusion 4b to the protrusion 4c adjacent to the protrusion 4b are 10 It is preferable to form so as to be ˜35 mm. In the first embodiment, for example, when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the distance L6 is 30 mm. The distance L7 from the protrusion 4c to the center of the rib 1 adjacent to the protrusion 4c is preferably 17.5 to 35 mm. In the first embodiment, for example, when the number of the ridges 4 is three and the width B of the ridges 4 is 25 mm, the distance L7 is 32.5 mm. Here, the interval between the ribs 1 and 2 and the protrusions 4 adjacent to the ribs 1 and 2 and the interval between the adjacent protrusions 4 vary depending on the number of the protrusions 4, but are as equal as possible. It is preferable.

Of the ridges 4 formed on the surface 3b between the ribs 1 and 2, the distance L8 from the center of the rib 1 to the ridge 4d closest to the rib 1 is 17.5 to 35 mm. It is preferable to form it as follows. In the first embodiment, for example, when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the distance L8 is 32.5 mm. Further, the distance L9 from the protrusion 4d to the protrusion 4e adjacent to the protrusion 4d and the distance L10 from the protrusion 4e to the protrusion 4f adjacent to the protrusion 4e are 10 It is preferable to form so as to be ˜35 mm. In the first embodiment, for example, when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the distance L10 is 30 mm. The distance L11 from the protrusion 4f to the center of the rib 2 adjacent to the protrusion 4f is preferably 17.5 to 35 mm. In the first embodiment, for example, when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the distance L11 is 32.5 mm.
Therefore, in the first embodiment, for example, when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the ribs 1 and the protrusions 4c adjacent to the ribs 1c, The distance between the centers of 4d is 45 mm. Moreover, the space | interval between the centers of the adjacent protrusion part 4 is 55 mm. Here, the distance between the centers of the ribs 1 and the protrusions 4c and 4d adjacent to the ribs 1 is preferably within a range of 30 to 45 mm, and the distance between the centers of the adjacent protrusions 4 is , Preferably in the range of 35 to 55 mm.
In the first embodiment, for example, when the number n of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the length L1 in the width direction of one of the surface portions 3a and 3b. , L2, the ratio r (r1, r2) of the length other than the protrusion 4 in the width direction is calculated by the following formulas (1) and (2).
r1 = (L1−B × n) / L1 (1)
r2 = (L2−B × n) / L2 (2)
Therefore, the ratio r (r1, r2) has the following value.
r1 = (200−25 × 3) /200=0.625
r2 = (200−25 × 3) /200=0.625
Therefore, in the case where the width of the surface portion 3 and the width of the ridge portion 4 are as described above, in order to keep the ratio r within the range of 0.5 to 0.7, the ridge is per one surface portion 3. The number of parts 4 is 3-4.

(Locking part)
The locking portion 5 is formed at one end of the deck plate 10. The locking portion 5 is an end portion of a steel material that is bent at a substantially right angle from the surface portion 3a, and is formed so as to extend along the height direction of the ribs 1 and 2. The height h of the locking portion 5 is 10 to 25 mm. When engaging the deck plate 10 with the locking portion 5, the locking portion 5 of one deck plate 10 is inserted into a receiving portion 50 formed on the rib 2 of the other deck plate 10. When connecting the deck plate 10, a part of the surface portion 3a of the deck plate 10 is formed on the upper surface of the surface portion 3a and the extending portion 8 extending along the surface portion 3b. Are stacked so as to be placed, and the locking portion 5 is inserted into the receiving portion 50. Here, the distance L3 from the center of the rib 2 to the end of the extending portion 8 is 10 to 25 mm.
Note that the locking portion 5 may be of a height that can be locked to the receiving portion 50, and is not necessarily within the range of 10 to 25 mm. Alternatively, on the assumption that the placed concrete does not leak, the surface portions may be overlapped, joined by welding, or connected by a fastener such as a screw without forming the locking portion 5.
Further, the receiving part 50 is not limited to the range of 10 to 25 mm as long as the locking part 5 can be inserted into the receiving part 50.

(End closing part)
As shown in FIG. 2, the end close portions 6 are formed at both ends of the deck plate 10 in the length direction (longitudinal direction). The end close portion 6 is formed by crushing both ends of the rib 1 and the rib 2 in a direction perpendicular to the surface of the deck plate 10. As a result, the rib 1 and the rib 2 are formed in a cross section in which the end close portions 6 at both ends are crushed, and other portions sandwiched between the end close portions 6 are formed in a substantially triangular shape in cross section. Yes. As a result, both end portions of the rib 1 and the rib 2 are lower in height than other portions, and thus can be placed on the upper surface of the flange portion of the beam 20. The end close part 6 is formed so that the length along the extending direction of the rib 1 and the rib 2 is longer than the length to be placed on the upper surface of the flange part of the beam 20.

As described above, since the protrusion 4 is formed on the surface portion 3 of the deck plate 10, the effective cross-sectional area can be increased by the protrusion 4 at a position away from the ribs 1 and 2 in the surface portion 3. The cross-sectional performance of the deck plate 10 can be improved. Thereby, the allowable span of the deck plate 10 can be increased.
Further, by improving the cross-sectional performance, the deck plate 10 can be made thinner and lighter than before.
Further, the protruding portion 4 is formed such that a ratio r of the length other than the protruding portion 4 in the width direction to the length in the width direction of the surface portion 3 is in a range of 0.5 to 0.7. Yes. More specifically, by forming 3-5 ridges 4 per one surface portion 3, all of the surface portions 3 can have an effective cross section, so that a sufficient amount of cross-sectional performance can be obtained with a small amount of ridge portions 4. Can be manufactured, and a significant increase in the weight of the deck plate 10 can be suppressed. Even if the deck plate 10 is made thin, the surface portion 3 between the ribs 1 and 2 does not bend when the concrete is placed.

In addition, by setting the ratio r in the range of 0.5 to 0.7, the number of the ridges 4 can be suppressed to 3 to 5 per one surface portion 3, so that The amount of concrete that enters the formed depression is not significantly increased, and a significant increase in the weight of the floor structure (or ceiling structure) and a large increase in the concrete material can be suppressed. There is no need to increase the thickness.
Further, since the locking portion 5 is formed at one end of the deck plate 10 and the receiving portion 50 is formed in the rib 2 near the other end, one deck plate is overlapped with the other deck plate. By simply inserting the locking portion 5 into the receiving portion 50, the two deck plates 10 can be easily connected, and workability can be improved.
In addition, by forming the ridges 4, it becomes difficult for an operator to slip when working on the deck plate 10, and work efficiency can be improved.

<Improvement of cross-sectional performance of deck plate by formation of protrusions>
Next, with reference to FIG. 5 to FIG. 7, an improvement in the cross-sectional performance of the deck plate by forming the protrusions of the deck plate 10 according to the first embodiment will be described.
FIG. 5A is a graph in which the horizontal axis represents the ratio r of the length other than the protrusion 4 to the length in the width direction of the surface portion 3, and the vertical axis represents the increase rate of the effective cross-section secondary moment. . In FIG. 5B, the horizontal axis indicates the ratio r of the length other than the ridge portion 4 to the length of the surface portion 3 in the width direction, and the vertical axis indicates the rate of increase of the effective sectional secondary moment and the weight of the deck plate 10. It is the graph which took ratio with the increase rate. FIG. 5C is a graph in which the graphs of FIG. 5A and FIG. 5B are combined into one and shows a range with excellent cross-sectional performance. In addition, the width | variety of the protrusion part was 25 mm, height was 6 mm, and the bending radius R of the curved part was 3 mm.

As shown in FIG. 5A, the ratio r (r1) of the lengths (L4 + L5 + L6 + L7) and (L8 + L9 + L10 + L11) other than the ridges with respect to the lengths L1, L2 in the width direction of the deck plate 10 per one surface portion 3. , R2 are all the same value, and in the following, when the ratio r) is 0.9), the increase rate of the effective sectional secondary moment is less than 1.3. Further, in the range of the ratio r of 0.7 to 1.0, the increase rate of the effective cross-sectional secondary moment increases rapidly as the number of the protrusions 4 increases (the ratio r decreases). When the ratio r is 0.3 to 0.7, the increase rate of the effective section secondary moment exceeds 1.6. However, when the ratio r is 0.3 to 0.5, the increasing rate of the effective sectional second moment is slightly lower than when the ratio r is 0.5 to 0.7.
As shown in FIG. 5B, even if the ratio of the increase rate of the effective sectional secondary moment and the increase rate of the weight of the deck plate 10 by increasing the protrusion 4 (decreasing the ratio r) is compared. When the ratio r is in the vicinity of 0.6, the highest numerical value exceeding 1.6 is shown. Even if the protrusion 4 is further increased (decreasing the ratio r), the increase rate of the effective section secondary moment is increased. The ratio of the weight increase rate gradually decreases. This is because when the number of protrusions 4 is small, even if the rate of increase in the weight of the deck plate 10 is small, the rate of increase in the effective moment of inertia is small in the first place. This is because when the number of the ridges 4 is large, the rate of increase in the weight of the deck plate 10 is large, so that the effect as high as when the ratio r is 0.6 cannot be obtained.

Therefore, as in the section S in FIG. 5C, forming the protrusions 4 so that the ratio r is in the range of 0.5 to 0.7 on one surface part 3 improves the cross-sectional performance. Although it is preferable from the viewpoint of weight reduction of the deck plate and economy, it is understood that it is optimal to form the protrusions 4 so that the ratio r is in the vicinity of 0.6. Here, the ratio r in the range of 0.5 to 0.7 is suitable because, in FIG. 5 (b), the increase rate of the effective sectional secondary moment exceeds 1.6 and is almost horizontal. That is, when the rate of increase of the effective cross-section secondary moment converges at a rate of r = 0.7 or less, the ratio is about 5% lower than the maximum ratio of the effective cross-section secondary moment increase rate and weight increase rate. This is due to the fact that up to is recognized as a range in which the cross-sectional efficiency is good.
Further, when the protrusion 4 is not formed, as described above, the calculation is performed with the deflection coefficient C being 1.6, but the ratio r of the surface 3 is within the range of 0.5 to 0.7. When the protrusion 4 is formed, the cross-sectional performance is remarkably improved, and the effective moment of inertia is 1.6 times or more compared to the case where the protrusion 4 is not formed. Since the region can be considered as an effective cross section, the deflection coefficient C is 1.0.
Further, by forming the ridge portion 4 so that the ratio r is in the range of 0.5 to 0.7 on one surface portion 3, the thickness of the deck plate 10 is 0.8 mm, and the yield point of the steel material is set. When 235 N / mm ² and the slab thickness are 150 mm, the allowable span of the deck plate 10 can be increased from 3300 mm (when there are no ridges) to 3860 mm (when there are three ridges).

<Modification 1 of the ridge portion>
Next, a modification 1 of the protruding portion in the first embodiment will be described.
The protruding portion 4 is not limited to the above width and height. For example, the width of the protrusion 4 may be 20 mm and the height may be 7 mm. In this case, FIG. 6A shows the ratio r of the length other than the ridge portion 4 to the length in the width direction of the surface portion 3 on the horizontal axis, and the vertical axis of the effective cross-section secondary moment in the first modification. It is the graph which took the increase rate. In FIG. 6B, the horizontal axis represents the ratio r of the length other than the ridges 4 to the length in the width direction of the surface portion 3, and the vertical axis represents the rate of increase of the effective sectional secondary moment and the weight of the deck plate 10. It is the graph which took ratio with the increase rate. FIG. 6C is a graph in which the graphs of FIG. 6A and FIG. 6B are combined into one, and shows a range with excellent cross-sectional performance.

Compared with said 1st Embodiment, although the width | variety of the protrusion 4 is 5 mm smaller and the height is 1 mm larger, in this case, the ratio other than the protrusion 4 in one surface part 3 When r is in the range of 0.7 to 1.0, the increase rate of the effective section secondary moment increases as the number of the protrusions 4 increases (the ratio r decreases). Even if it is reduced from the vicinity, the increase rate of the effective sectional secondary moment is only slightly increased, and no significant effect is observed. On the other hand, regarding the ratio between the increase rate of the effective sectional secondary moment and the increase rate of the weight, since the weight of the deck plate 10 increases as the number of the protrusions 4 is increased (the ratio r is decreased), the ratio r is 0. In the case of .7, the highest value is shown as 1.6, and even if the ratio r is reduced, the ratio of the increase rate of the effective section secondary moment and the increase rate of the weight gradually decreases.

Therefore, even in the case of this ridge portion 4, the ridge portion 4 is set so that the ratio r is within the range of 0.5 to 0.7 for one surface portion 3 as in the section S in FIG. It can be seen that forming is preferable from the viewpoint of improving the cross-sectional performance, reducing the weight of the deck plate, and economically.
Further, when the protrusion 4 is not formed, as described above, the calculation is performed with the deflection coefficient C being 1.6, but when the ratio r is in the range of 0.5 to 0.7, the protrusion Compared with the case where the strip 4 is not formed, the cross-sectional performance is remarkably improved, the effective cross-section secondary moment is 1.6 times or more, and the entire area of the surface portion 3 can be considered as an effective cross-section. The deflection coefficient C is 1.0.
Moreover, in the modification 1, for example, when the number n of the protrusions 4 is three and the width B of the protrusions 4 is 20 mm, the lengths L1 and L2 in the width direction of the one surface 3a and 3b When the ratio r (r1, r2) of the length other than the ridges 4 in the width direction is calculated using the above formulas (1) and (2), the following values are obtained.
r1 = (200−20 × 3) /200=0.7
r2 = (200−20 × 3) /200=0.7
Therefore, in the case of the width of the surface portion 3 and the width of the protruding portion 4 as in Modification 1, in order to keep the ratio r within the range of 0.5 to 0.7, The number of ridges 4 is 3-5.

<Modification 2 of ridge part>
Next, a modification 2 of the protruding portion in the first embodiment will be described. For example, the protrusion 4 may have a width of 20 mm and a height of 8 mm. In this case, FIG. 7A shows the ratio r of the length other than the protrusion 4 to the length in the width direction of the surface portion 3 on the horizontal axis in the modified example 2, and the effective cross-section second moment of the vertical axis on the vertical axis. It is the graph which took the increase rate. In FIG. 7 (b), the horizontal axis represents the ratio r of the length other than the protrusion 4 to the width in the width direction of the surface portion 3, and the vertical axis represents the rate of increase of the effective sectional secondary moment and the weight increase of the deck plate. It is the graph which took ratio with rate. FIG. 7C is a graph in which the graphs of FIG. 7A and FIG. 7B are combined into one, and shows a range with excellent cross-sectional performance.

Compared to the first embodiment, the width of the protrusion 4 is 5 mm smaller and the height is 2 mm larger. In this case, the ratio of the one surface 3 other than the protrusion 4 is as follows. When r is in the range of 0.7 to 1.0, the increase rate of the effective section secondary moment increases as the number of the protrusions 4 increases (the ratio r decreases). Even if it is reduced from the vicinity, the increase rate of the effective sectional secondary moment is only slightly increased, and no significant effect is observed. On the other hand, regarding the ratio between the increase rate of the effective sectional secondary moment and the increase rate of the weight, since the weight of the deck plate 10 increases as the number of the protrusions 4 is increased (the ratio r is decreased), the ratio r is 0. In the case of .7, the highest value is shown in the vicinity of 1.6, and even if the ratio r is decreased, the ratio of the increase rate of the effective sectional secondary moment to the increase rate of the weight gradually decreases.

Therefore, even in the case of this ridge portion 4, the ridge portion 4 has a ratio r within a range of 0.5 to 0.7 on one surface portion 3 as in the section S in FIG. It can be seen that forming is preferable from the viewpoint of improving the cross-sectional performance, reducing the weight of the deck plate, and economically.
Further, when the protrusion 4 is not formed, as described above, the calculation is performed with the deflection coefficient C being 1.6, but when the ratio r is in the range of 0.5 to 0.7, the protrusion Compared with the case where the strip 4 is not formed, the cross-sectional performance is remarkably improved, the effective cross-section secondary moment is 1.6 times or more, and the entire area of the surface portion 3 can be considered as an effective cross-section. The deflection coefficient C is 1.0.
In the second modification, for example, when the number n of the ridges 4 is three and the width B of the ridges 4 is 20 mm, the lengths L1 and L2 in the width direction of one of the surface portions 3a and 3b are as follows. When the ratio r (r1, r2) of the length other than the ridges 4 in the width direction is calculated using the above formulas (1) and (2), the following values are obtained.
r1 = (200−20 × 3) /200=0.7
r2 = (200−20 × 3) /200=0.7
Therefore, in the case of the width of the surface portion 3 and the width of the ridge portion 4 as in Modification 2, in order to keep the ratio r within the range of 0.5 to 0.7, The number of ridges 4 is 3-5.

2. Second Embodiment A configuration of a deck plate 100 according to a second embodiment will be described with reference to FIGS. The deck plate 100 according to the second embodiment is obtained by changing the number of ribs 1 and 2 and the height of the ribs 1 and 2 of the deck plate 10 according to the first embodiment described above. Yes, the configuration of other parts is the same. Therefore, in the following, the same components as those of the deck plate 10 according to the first embodiment are denoted by the same reference numerals as those of the deck plate 10 and description thereof is omitted.

<Configuration of deck plate>
As shown in FIG. 8, the deck plate 100 includes three ribs 101a, 101b, and 101c, a surface portion 3, a ridge portion 4, a locking portion 5, and an end closing portion 6 (see FIG. 2). I have. The thickness of the deck plate 100 is preferably 0.6 to 1.6 mm, like the deck plate 10 in the first embodiment. In the second embodiment, the thickness of the deck plate 10 is 0.8 mm.

The deck plate 100 is formed with three ribs 101a, 101b, and 101c. Each rib 101a, 101b, 101c has the curved part 11, the linear part 12, the folding | returning part 13, the linear part 14, and the curved part 15, respectively, similarly to the rib 10 of 1st Embodiment. The ribs 101a and 101b, and the ribs 101b and 101c are formed at intervals of 180 to 220 mm (distance between centers) along the width direction (short direction) of the deck plate 100, respectively. Specifically, the deck plate 100 is formed such that the length L in the width direction is 540 to 660 mm, and the rib 101a extends from one end in the width direction of the deck plate 100 to the center of the rib 101a (straight with the straight portion 12). The distance La to the boundary surface where the portion 14 abuts the center of the rib 101a is 180 to 220 mm. The rib 101b is formed such that the distance Lb from the center of the rib 101a to the center of the rib 101b (the boundary surface where the straight portion 12 and the straight portion 14 abut on the center of the rib 101b) is 180 to 220 mm. Has been. Further, the rib 101c is formed such that the distance Lc from the center of the rib 101b to the center of the rib 101c (the boundary surface where the straight portion 12 and the straight portion 14 abut on the center of the rib 101c) is 180 to 220 mm. Has been. That is, the rib 101a is formed on one end side (left side in FIG. 8) from the center in the width direction of the deck plate 100, and the rib 101b and the rib 101c are on the other end side from the center in the width direction of the deck plate 100. (The right side in FIG. 8). Here, the distances La, Lb, and Lc are preferably equal, and in the second embodiment, the distances La, Lb = Lc = 210 mm, and L = 630 mm are formed.
In the second embodiment, the ribs 101a, 101b, and 101c are formed such that the height H3 from the lower end to the upper end (upper surface) of the surface portion 3 is H3 = 75 mm.

As shown in FIG. 8, the surface portion 3 is a portion where the ribs 101 a, 101 b, and 101 c are mainly not formed on the deck plate 100, and is a surface that mainly receives the load of the concrete to be placed. The surface portion 3 is formed next to the ribs 101a, 101b, 101c in the width direction of the deck plate 100. That is, in the deck plate 100, the ribs 101a, 101b, 101c and the surface portion 3 are alternately formed. In the deck plate 100, the surface portions 3 are formed on the same plane.
In the second embodiment, the three ribs 101a, 101b, 101c and the three surface portions 3 are formed, but it is preferable to form the same number of ribs and surface portions.

As shown in FIGS. 8 and 9, the protrusion 4 is formed by bending a steel plate. The protrusion 4 is formed so as to protrude toward the surface where the ribs 101a, 101b, and 101c are formed on the surface 3. Thereby, the surface part 3 becomes a surface where a flat part and a trough part (mountain part when it sees from the other side) continue alternately.
A plurality of protrusions 4 are formed side by side along the width direction of the deck plate 100, and for example, three protrusions 4 are formed per one surface portion 3. Here, as shown in FIG. 8, in the protrusion 4, the ratio ra of the length (L4 + L5 + L6 + L7) other than the protrusion 4 in the width direction to the length La in the width direction of the surface portion 3 a of the deck plate 100 is 0. The number and size of the protrusions 4a, 4b, and 4c are determined so as to be within the range of 0.5 to 0.7. Also in the surface portion 3b of the deck plate 100, the ratio rb of the length (L8 + L9 + L10 + L11) other than the protruding portion 4 in the width direction to the length Lb in the width direction of the surface portion 3b is in the range of 0.5 to 0.7. As described above, the number, width, and depth of the protrusions 4d, 4e, and 4f are determined. Also in the surface portion 3c of the deck plate 100, the ratio rc of the length (L12 + L13 + L14 + L15) other than the protruding portion 4 in the width direction to the length Lc in the width direction of the surface portion 3c is in the range of 0.5 to 0.7. As described above, the number, width, and depth of the protrusions 4g, 4h, and 4i are determined. More specifically, the number of protrusions 4 depends on the width thereof, but is preferably limited to, for example, 3 to 5 per one surface 3 (3a, 3b, 3c).

As shown in FIG. 9, the protruding portion 4 has a width B of 25 mm along the width direction of the deck plate 100 and a height H4 (the outer surface of the portion that protrudes from the lower surface of the surface portion 3 most from the ribs 101a, 101b, 101c side). Is preferably 6 mm. The protrusion 4 is preferably formed so that the bending radius R of the curved portion 43 (boundary portion and trough portion with the surface portion 3) where the metal plate is curved is 3 to 5 mm.

As shown in FIG. 8, among the protrusions 4 formed on the surface portion 3 a between one end of the deck plate 100 and the rib 101 a, the protrusion closest to the one end of the deck plate 100 from one end of the deck plate 100. The distance L4 to the portion 4a is formed to be 37.5 mm when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm. The distance L5 from the ridge 4a to the ridge 4b adjacent to the ridge 4a and the distance L6 from the ridge 4b to the ridge 4c adjacent to the ridge 4b are 30 mm. It is formed to become. The distance L7 from the protrusion 4c to the center of the rib 101a adjacent to the protrusion 4c is 37.5 mm.

Of the protrusions 4 formed on the surface 3b between the ribs 101a and 101b, the distance L8 from the center of the rib 101a to the protrusion 4d closest to the rib 101a is the number of protrusions 4 When the width B of the protrusion 4 is 25 mm, it is formed to be 37.5 mm. Further, the distance L9 from the protrusion 4d to the protrusion 4e adjacent to the protrusion 4d, and the distance L10 from the protrusion 4e to the protrusion 4f adjacent to the protrusion 4e are 30 mm. It is formed to become. Further, the distance L11 from the protrusion 4f to the center of the rib 101b adjacent to the protrusion 4f is 37.5 mm.

Of the protrusions 4 formed on the surface portion 3c between the ribs 101b and 101c, the distance L12 from the center of the rib 101c to the protrusion 4g closest to the rib 101c is the number of the protrusions 4 When the width B of the protrusion 4 is 25 mm, it is formed to be 37.5 mm. Further, the distance L13 from the ridge 4g to the ridge 4h adjacent to the ridge 4g and the distance L14 from the ridge 4h to the ridge 4i adjacent to the ridge 4h are 30 mm. It is formed to become. Further, the distance L15 from the protrusion 4i to the center of the rib 101c adjacent to the protrusion 4i is formed to be 37.5 mm.

Therefore, in the second embodiment, for example, when the number of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the ribs 101a and the protrusions 4c adjacent to the ribs 101a, The distance between the centers of the rib 101b and the ribs 4f and 4g adjacent to the rib 101b, and the distance between the centers of the rib 101c and the ribs 4i adjacent to the rib 101c are as follows. , 50 mm. Moreover, the space | interval between the centers of the adjacent protrusion part 4 is 55 mm.

In the second embodiment, for example, when the number n of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the length La in the width direction of one of the surface portions 3a, 3b, 3c , Lb, Lc, the ratio r (ra, rb, rc) of the length other than the protruding portion 4 in the width direction is calculated by the following equations (3), (4), and (5).
ra = (La−B × n) / La (3)
rb = (Lb−B × n) / Lb (4)
rc = (Lc−B × n) / Lc (5)
Therefore, the ratio r (ra, rb, rc) has the following value.
ra = (210-25 × 3) /210=0.6428 ...
rb = (210-25 × 3) /210=0.6428 ...
rc = (210−25 × 3) /210=0.6428 ...
Therefore, in the case where the width of the surface portion 3 and the width of the ridge portion 4 are as described above, in order to keep the ratio r within the range of 0.5 to 0.7, the ridge is per one surface portion 3. The number of parts 4 is 3-4.

<Improvement of cross-sectional performance of deck plate by formation of protrusions>
Next, with reference to FIG. 10 to FIG. 12, an improvement in the cross-sectional performance of the deck plate due to the formation of the protrusions of the deck plate 100 according to the second embodiment will be described. That is, the cross-sectional performance of the deck plate 100 due to the formation of the ridges 4 of the deck plate 100 formed with three ribs 101a, 101b, and 101c and the height H3 of the ribs 101a, 101b, and 101c being 75 mm. The improvement will be described.

FIG. 10A is a graph in which the horizontal axis represents the ratio r of the length other than the protrusions 4 to the length in the width direction of the surface portion 3, and the vertical axis represents the increase rate of the effective cross-sectional secondary moment. . In FIG. 10B, the horizontal axis represents the ratio r of the length other than the ridges 4 to the width of the surface 3 in the width direction, and the vertical axis represents the rate of increase of the effective sectional secondary moment and the weight of the deck plate 100. It is the graph which took ratio with the increase rate. FIG. 10C summarizes the graphs of FIG. 10A and FIG. 10B into one, and is a graph showing a range with excellent cross-sectional performance.

As shown in FIG. 10A, for each surface portion 3, the lengths (L4 + L5 + L6 + L7), (L8 + L9 + L10 + L11), (L12 + L13 + L14 + L15) other than the protrusions with respect to the lengths La, Lb, Lc in the width direction of the deck plate 100 ) Ratio r (ra, rb, rc are all the same value, and hereinafter, simply referred to as ratio r) is 0.9, the rate of increase in effective moment of inertia is 1.3. Is also less. Further, in the range of the ratio r of 0.7 to 1.0, the increase rate of the effective cross-sectional secondary moment increases rapidly as the number of the protrusions 4 increases (the ratio r decreases). When the ratio r is 0.3 to 0.7, the increase rate of the effective section secondary moment exceeds 1.6. However, when the ratio r is 0.3 to 0.5, the increasing rate of the effective sectional second moment is slightly lower than when the ratio r is 0.5 to 0.7.
As shown in FIG. 10B, even if the ratio of the increase rate of the effective sectional secondary moment is compared with the increase rate of the weight of the deck plate 10 by increasing the protrusion 4 (decreasing the ratio r), When the ratio r is in the vicinity of 0.6, the highest numerical value exceeding 1.6 is shown. Even if the protrusion 4 is further increased (decreasing the ratio r), the increase rate of the effective section secondary moment is increased. The ratio of the weight increase rate gradually decreases. This is because when the number of protrusions 4 is small, even if the rate of increase in the weight of the deck plate 10 is small, the rate of increase in the effective moment of inertia is small in the first place. This is because when the number of the ridges 4 is large, the rate of increase in the weight of the deck plate 100 is large, so that the effect as high as when the ratio r is 0.6 cannot be obtained.

Therefore, as shown in the section S in FIG. 10C, forming the protrusions 4 so that the ratio r is in the range of 0.5 to 0.7 on one surface 3 improves the cross-sectional performance. Although it is preferable from the viewpoint of weight reduction of the deck plate and economy, it is understood that it is optimal to form the protrusions 4 so that the ratio r is in the vicinity of 0.6. Here, the ratio r in the range of 0.5 to 0.7 is suitable because, in FIG. 10B, the rate of increase of the effective section secondary moment exceeds 1.6 and is almost horizontal. That is, when the rate of increase of the effective cross-section secondary moment converges at a rate of r = 0.7 or less, the ratio is about 5% lower than the maximum ratio of the effective cross-section secondary moment increase rate and weight increase rate. This is due to the fact that up to is recognized as a range in which the cross-sectional efficiency is good.
Further, when the protrusion 4 is not formed, as described above, the calculation is performed with the deflection coefficient C being 1.6, but the ratio r of the surface 3 is within the range of 0.5 to 0.7. When the protrusion 4 is formed, the cross-sectional performance is remarkably improved, and the effective moment of inertia is 1.6 times or more compared to the case where the protrusion 4 is not formed. Since the region can be considered as an effective cross section, the deflection coefficient C is 1.0. Further, by forming the ridge portion 4 so that the ratio r is in the range of 0.5 to 0.7 on one surface portion 3, the thickness of the deck plate 10 is 0.8 mm, and the yield point of the steel material is set. When 235 N / mm ² and the slab thickness are 150 mm, the allowable span of the deck plate 10 can be increased from 2530 mm (when there are no ridges) to 2780 mm (when there are three ridges).

<Modification 1 of the ridge portion>
Next, a modification 1 of the protruding portion in the second embodiment will be described.
Three ribs 101a, 101b, 101c are formed, and the protrusion 4 of the deck plate 100 formed so that the height H3 of the ribs 101a, 101b, 101c is 75 mm is limited to the above width and height. It is not a thing. For example, the width of the protrusion 4 may be 20 mm and the height may be 7 mm. In this case, FIG. 11A shows the ratio r of the length other than the ridge portion 4 to the length in the width direction of the surface portion 3 on the horizontal axis, and the vertical axis of the effective cross-section secondary moment in the first modification. It is the graph which took the increase rate. In FIG. 11 (b), the horizontal axis represents the ratio r of the length other than the ridges 4 to the length of the surface portion 3 in the width direction, and the vertical axis represents the increase rate of the effective moment of inertia and the weight of the deck plate 100. It is the graph which took ratio with the increase rate. FIG. 11C summarizes the graphs of FIG. 11A and FIG. 11B into one, and is a graph showing a range with excellent cross-sectional performance.

Compared with said 2nd Embodiment, although the width | variety of the protrusion part 4 becomes 5 mm smaller and the height H4 becomes 1 mm larger, in this case, other than the protrusion part 4 in one surface part 3 When the ratio r is in the range of 0.7 to 1.0, the increase rate of the effective cross-section secondary moment increases as the number of the protrusions 4 increases (the ratio r decreases). However, even if the ratio r is reduced from 0.7, the rate of increase of the effective sectional secondary moment gradually decreases and no significant effect is observed. On the other hand, regarding the ratio between the increase rate of the effective sectional secondary moment and the increase rate of the weight, since the weight of the deck plate 10 increases as the number of the protrusions 4 is increased (the ratio r is decreased), the ratio r is 0. In the case of .7, the highest value is shown as 1.6, and even if the ratio r is reduced, the ratio of the increase rate of the effective section secondary moment and the increase rate of the weight gradually decreases.

Therefore, even in the case of this ridge portion 4, the ridge portion 4 has a ratio r within a range of 0.5 to 0.7 on one surface portion 3 as in the section S in FIG. It can be seen that forming is preferable from the viewpoint of improving the cross-sectional performance, reducing the weight of the deck plate, and economically.
In the first modification, for example, when the number n of the protrusions 4 is three and the width B of the protrusions 4 is 20 mm, the length La in the width direction of one of the surface portions 3a, 3b, 3c, When the ratio r (ra, rb, rc) of the length other than the protrusions 4 in the width direction with respect to Lb, Lc is calculated using the above formulas (3), (4), and (5), It becomes the following values.
ra = (210-20 × 3) /210=0.7142
rb = (210−20 × 3) /210=0.7142
rc = (210−20 × 3) /210=0.7142
Therefore, in the case of the width of the surface portion 3 and the width of the protruding portion 4 as in Modification 1, in order to keep the ratio r within the range of 0.5 to 0.7, The number of ridges 4 is 4-5.

<Modification 2 of ridge part>
Next, a modification 2 of the protrusions in the second embodiment will be described.
Three ribs 101a, 101b, and 101c are formed, and the rib portion 4 of the deck plate 100 formed so that the height H3 of the ribs 101a, 101b, and 101c is 75 mm is, for example, the width of the rib portion 4. It may be 20 mm and the height may be 8 mm. In this case, FIG. 12A shows the ratio r of the length other than the ridge portion 4 to the length in the width direction of the surface portion 3 on the horizontal axis, and the vertical axis of the effective cross-section secondary moment in the second modification. It is the graph which took the increase rate. In FIG. 12 (b), the horizontal axis represents the ratio r of the length other than the ridge portion 4 to the length in the width direction of the surface portion 3, and the vertical axis represents the rate of increase of the effective sectional secondary moment and the weight of the deck plate 100. It is the graph which took ratio with the increase rate. FIG. 12C summarizes the graphs of FIG. 12A and FIG. 12B into one, and is a graph showing a range with excellent cross-sectional performance.

Compared with the second embodiment of the present invention described above, the width of the protrusion 4 is 5 mm smaller and the height H4 is 2 mm larger. When the ratio r other than 4 is in the range of 0.7 to 1.0, the rate of increase of the effective section secondary moment increases as the number of the protrusions 4 increases (the ratio r decreases). However, even if the ratio r is reduced from the vicinity of 0.7, the increase rate of the effective section secondary moment gradually decreases, and no significant effect is observed. On the other hand, regarding the ratio between the increase rate of the effective sectional secondary moment and the increase rate of the weight, since the weight of the deck plate 10 increases as the number of the protrusions 4 is increased (the ratio r is decreased), the ratio r is 0. In the case of .7, the highest value is shown in the vicinity of 1.6, and even if the ratio r is decreased, the ratio of the increase rate of the effective sectional secondary moment to the increase rate of the weight gradually decreases.

Therefore, even in the case of this ridge 4, as in the section S in FIG. 12 (c), the ridge 4, so that the ratio r is within the range of 0.5 to 0.7 on one surface portion 3. It can be seen that forming is preferable from the viewpoint of improving the cross-sectional performance, reducing the weight of the deck plate, and economically.
In the second modification, for example, when the number n of the protrusions 4 is three and the width B of the protrusions 4 is 20 mm, the length La in the width direction of one of the surface portions 3a, 3b, 3c, When the ratio r (ra, rb, rc) of the length other than the protrusions 4 in the width direction with respect to Lb, Lc is calculated using the above formulas (3), (4), and (5), It becomes the following values.
ra = (210-20 × 3) /210=0.7142
rb = (210−20 × 3) /210=0.7142
rc = (210−20 × 3) /210=0.7142
Therefore, in the case of the width of the surface portion 3 and the width of the ridge portion 4 as in Modification 2, in order to keep the ratio r within the range of 0.5 to 0.7, The number of ridges 4 is 4-5.

<Modification 3 of ridge part>
Next, a modification 3 of the protrusions in the second embodiment will be described.
The deck plate 100 in which the three ribs 101a, 101b, and 101c are formed and the height H3 of the ribs 101a, 101b, and 101c is 75 mm is not limited to the above plate thickness. For example, the thickness of the deck plate 100 may be 0.6 mm. In this case, FIG. 13A shows the ratio r of the length other than the ridge portion 4 to the length in the width direction of the surface portion 3 on the horizontal axis, and the vertical axis of the effective cross-section secondary moment in the modified example 3. It is the graph which took the increase rate. In FIG. 13B, the horizontal axis represents the ratio r of the length other than the ridge portion 4 to the length of the surface portion 3 in the width direction, and the vertical axis represents the rate of increase of the effective sectional secondary moment and the weight of the deck plate 100. It is the graph which took ratio with the increase rate. FIG. 13C is a graph in which the graphs of FIG. 13A and FIG. 13B are combined into one and shows a range with excellent cross-sectional performance.

Compared to the second embodiment, the plate thickness is 0.2 mm thinner. In this case, the ratio r of the one surface portion 3 other than the protrusion 4 is 0.7 to 1.0. In the range, the increasing rate of the effective cross-section secondary moment increases as the number of the protrusions 4 increases (the ratio r decreases). However, even if the ratio r is reduced from 0.7, the rate of increase of the effective sectional secondary moment is only slightly increased in the range of the ratio r from 0.6 to 0.7, and the ratio r is decreased from 0.6. However, it gradually decreases and no significant effect is seen. On the other hand, regarding the ratio between the increase rate of the effective sectional secondary moment and the increase rate of the weight, since the weight of the deck plate 10 increases as the number of the protrusions 4 is increased (the ratio r is decreased), the ratio r is 0. In the case of the vicinity of .6, the highest value is shown as 1.75, and even if the ratio r is reduced, the ratio between the increase rate of the effective sectional secondary moment and the increase rate of the weight gradually decreases.

Therefore, even in the case of this ridge 4, the ridge 4, so that the ratio r is within the range of 0.5 to 0.7 on one surface portion 3, as in the section S in FIG. It can be seen that forming is preferable from the viewpoint of improving the cross-sectional performance, reducing the weight of the deck plate, and economically.
Further, in the third modification, for example, when the number n of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the length La in the width direction of one surface 3a, 3b, 3c, When the ratio r (ra, rb, rc) of the length other than the protrusions 4 in the width direction with respect to Lb, Lc is calculated using the above formulas (3), (4), and (5), It becomes the following values.
ra = (210-25 × 3) /210=0.6428 ...
rb = (210-25 × 3) /210=0.6428 ...
rc = (210−25 × 3) /210=0.6428 ...
Therefore, in the case of the width of the surface portion 3 and the width of the protruding portion 4 as in Modification 1, in order to keep the ratio r within the range of 0.5 to 0.7, The number of ridges 4 is 3-4.

<Modification 4 of ridge part>
Next, a modification 4 of the protrusions in the second embodiment will be described.
The deck plate 100 in which the three ribs 101a, 101b, and 101c are formed and the height H3 of the ribs 101a, 101b, and 101c is 75 mm is not limited to the above plate thickness. For example, the thickness of the deck plate 100 may be 1.2 mm. In this case, FIG. 14A shows the ratio r of the length other than the protrusion 4 to the length in the width direction of the surface portion 3 on the horizontal axis in the modified example 4, and the effective section secondary moment of the vertical axis on the vertical axis. It is the graph which took the increase rate. In FIG. 14 (b), the horizontal axis represents the ratio r of the length other than the protrusion 4 to the length in the width direction of the surface portion 3, and the vertical axis represents the rate of increase in the effective sectional secondary moment and the weight of the deck plate 100. It is the graph which took ratio with the increase rate. FIG. 14C is a graph in which the graphs of FIG. 14A and FIG. 14B are combined into one and shows a range with excellent cross-sectional performance.

Compared to the second embodiment, the plate thickness is 0.4 mm thick. In this case, the ratio r of the one surface portion 3 other than the protrusion 4 is 0.7 to 1.0. In the range, the increasing rate of the effective cross-section secondary moment increases as the number of the protrusions 4 increases (the ratio r decreases). However, even if the ratio r is reduced from 0.7, the rate of increase of the effective sectional secondary moment gradually decreases and no significant effect is observed. On the other hand, regarding the ratio between the increase rate of the effective sectional secondary moment and the increase rate of the weight, since the weight of the deck plate 10 increases as the number of the protrusions 4 is increased (the ratio r is decreased), the ratio r is 0. In the case of .7, the highest value is shown as 1.45 and the ratio of the increase rate of the effective cross-section second moment and the increase rate of the weight gradually decreases even if the ratio r is reduced.

Therefore, even in the case of this ridge 4, the ridge 4, so that the ratio r is within the range of 0.5 to 0.7 on one surface portion 3, as in the section S in FIG. It can be seen that forming is preferable from the viewpoint of improving the cross-sectional performance, reducing the weight of the deck plate, and economically.
Further, in the modified example 4, for example, when the number n of the protrusions 4 is three and the width B of the protrusions 4 is 25 mm, the length La in the width direction of one surface 3a, 3b, 3c, When the ratio r (ra, rb, rc) of the length other than the protrusions 4 in the width direction with respect to Lb, Lc is calculated using the above formulas (3), (4), and (5), It becomes the following values.
ra = (210-25 × 3) /210=0.6428 ...
rb = (210-25 × 3) /210=0.6428 ...
rc = (210−25 × 3) /210=0.6428 ...
Therefore, in the case of the width of the surface portion 3 and the width of the protruding portion 4 as in Modification 1, in order to keep the ratio r within the range of 0.5 to 0.7, The number of ridges 4 is 3-4.

As described above, also in the deck plate 100 according to the second embodiment of the present invention, the ridge portion 4 is formed on the surface portion 3 in the same manner as the deck plate 10 according to the first embodiment of the present invention described above. Since the ratio r of the length other than the protrusions 4 in the width direction to the length in the width direction is in the range of 0.5 to 0.7, while improving the cross-sectional performance, A significant increase in weight can be suppressed.

<Others>
The present invention is not limited to the above embodiment. For example, the folded portions 13 and 23 are not limited to a substantially triangular shape, and may be folded when the straight portion 12 and the straight portion 14 are in contact with each other and the straight portion 22 and the straight portion 24 are in contact with each other. Can be changed freely.
Moreover, you may form the protrusion part 4 so that it may protrude in any direction in the surface part 3. FIG.
The deck plates 10 and 100 are not limited to steel plates, and any material may be used as long as the deck plates 10 and 100 are metal plates that satisfy a predetermined cross-sectional performance.
Further, by using the deck plates 10 and 100 not only as a formwork for placing concrete, but also as a part of the floor structure (or ceiling structure), the floor is integrated with the concrete after the concrete is solidified. The rigidity of the structure (or ceiling structure) can also be increased.
Further, the deck plates 10 and 100 are not limited to the case of constructing a steel structure building, but may be used as a formwork for constructing a reinforced concrete structure or a formwork for producing precast concrete. .

Further, as shown in FIG. 15, when the deck plate 10 (or the deck plate 100) is bridged between the beams 20, the ribs 1 and 2 (or the ribs 101a, 101b, and 101c) of the deck plate 10 (100) are formed. It is also possible to mount the ribs 1 and 2 (101a, 101b, 101c) on the concrete placed on the deck plate 10 (100) with the surface being placed facing upward (concrete side). Good. In this case, after the concrete is solidified, the ribs 1 and 2 (101a, 101b, and 101c) can be deeply cut into the concrete, and the concrete and the deck plate 10 (100) are integrated to form a composite structure of steel concrete. Thus, the rigidity of the floor structure (or ceiling structure) can be increased.
Furthermore, you may arrange | position a reinforcing bar in the concrete cast on the deck plate 10 (100). In this case, the rigidity of the floor structure (or ceiling structure) can be further increased.
Furthermore, the deck placed between the beams 20 by placing the surface of the deck plate 10 (100) on which the ribs 1 and 2 (101a, 101b, 101c) are formed upward (concrete side). Since the ribs 1 and 2 (101a, 101b, and 101c) do not protrude below the plate 10 (100), the total length of one deck plate 10 (100) is increased as shown in FIG. One deck plate 10 (100) can be placed between the beams 20 (a plurality of spans).
When a plurality of deck plates 10 (100) are bridged between the beams 20, a part of the surface portion 3 including the locking portion 5 is cut off according to the distance in the width direction of the deck plate, and the deck plate 10 (100 ) May be used as an end width adjusting plate (an accessory).

DESCRIPTION OF SYMBOLS 1 Rib 2 Rib 3 Surface part 4 Projection part 5 Locking part 6 End close part 10 Deck plate 43 Curved part 50 Receiving part 100 Deck plate 101a Rib 101b Rib 101c Rib

Claims (11)

1. A deck plate formed from a metal plate and having face portions and ribs formed alternately and continuously,
   The surface portion is formed with a ridge portion protruding toward one surface side,
   The deck plate according to claim 1, wherein a ratio of a length other than the protruding portion in the width direction to a length in the width direction of the surface portion is in a range of 0.5 to 0.7.
2. The deck plate according to claim 1, wherein the same number of the surface portions and the ribs are formed.
3. The deck plate according to claim 1 or 2, wherein the protrusions are formed side by side at a predetermined interval in the width direction.
4. A locking portion is formed on the surface portion on one end side in the width direction,
   The deck plate according to any one of claims 1 to 3, wherein a receiving portion that receives the locking portion is formed on a rib on the other end side in the width direction.
5. The deck plate according to any one of claims 1 to 4, wherein a length of the surface portion in the width direction is 180 to 220 mm.
6. The deck plate according to any one of claims 1 to 5, wherein a width of the protruding portion is 20 to 25 mm.
7. The deck plate according to any one of claims 1 to 6, wherein the height of the protrusion is 4 to 8 mm.
8. The deck plate according to any one of claims 1 to 7, wherein a distance between the centers of the ribs and the protrusions adjacent to the ribs is 20 to 50 mm.
9. The deck plate according to any one of claims 1 to 8, wherein an interval between the centers of the adjacent protrusions is 30 to 60 mm.
10. The deck plate according to any one of claims 1 to 9, wherein a bending radius of the curved portion of the metal plate in the protruding portion is 3 to 5 mm.
11. The deck plate according to any one of claims 1 to 10, wherein 3 to 5 protrusions are formed per one surface portion.

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