JP6437626B1 - Deck plate and method for manufacturing deck plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of concrete from the longitudinal end portion of a deck plate at the time of placing without securing a separate member for securing the rigidity in the vicinity of the longitudinal end portion and preventing the concrete from leaking. A deck plate that can be prevented and a method for manufacturing the same are provided. A concrete slab deck plate 1 which is bent from a steel plate and formed into a rectangular shape in plan view includes a rectangular flat slab support portion 2 which supports a lower surface of the concrete slab, and the slab support portion 2 is provided. In addition, a buckling prevention rib (mountain rib 23) for preventing buckling is formed along the longitudinal direction, and a longitudinal end portion of the buckling prevention rib (mountain rib 23) is formed at a predetermined position away from the end. The lower end of the crushing and buckling prevention rib (mountain rib 23) and the lower end of the other part of the slab support 2 are positioned on the same plane. [Selection] Figure 2

Description

  The present invention relates to a deck plate for a synthetic slab that functions as a mold when casting concrete and that is integrated with the concrete and bears a tensile stress after the concrete is hardened, and a method for manufacturing the same.

  When a member having a small plate thickness and a wide plate width is subjected to a compressive force along the longitudinal direction, which is the direction of the material axis, the member buckles and the plate undulates and the cross-sectional performance of the deck plate decreases. For this reason, conventionally, in this type of synthetic slab deck plate, a buckling prevention rib is formed by providing irregularities for preventing buckling along the longitudinal direction so that the flat plate portion supporting the concrete slab does not buckle. It is common. Therefore, in order to prevent the concrete from leaking from the end portion in the longitudinal direction of the deck plate at the time of placing, it is necessary to fit the small closing member into the end portion of the deck plate.

  For example, Patent Document 1 discloses a flat closing plate portion 5 that is attached so as to cover an end opening of the deck plate 1 laid on the laying member 2, and an edge portion or covering portion of the closing plate portion 5. Disclosed is an end opening obturator for a deck plate that includes an engaging portion 6 that extends from the attachment surface and elastically abuts near the edge of the deck plate 1 to hold the closing plate portion 5 in an attached state. (Refer to claim 1 of claims of patent document 1, paragraphs [0038] to [0047] of the specification, FIG. 1 and FIG. 7 of the drawings, etc.).

  However, like the end opening obturator described in Patent Document 1, it is troublesome to close the end of the deck plate, which increases the installation cost of the deck plate, and the end opening obturator is separate from the deck plate. There was a problem that the material cost increased because it was necessary.

  In addition, as a deck plate, a flat deck plate that is used as a driving form that is generally flat (flat) and does not require dismantling, but is not calculated as a structural member that bears tensile stress is also known. ing.

  This kind of flat deck deck plate is generally subjected to an end closing process in order to prevent the concrete from leaking out from the end portion in the longitudinal direction of the deck plate during placement. For example, Patent Document 2 discloses a deck plate that has been proposed by the applicant of the present application and includes an end close portion that does not require a notch in an engagement rib (claim 1, claim 2 of patent document 2). (Refer to paragraphs [0052] to [0067] of the specification, FIGS. 1 and 3 and FIGS. 5 to 8 of the drawings).

  The deck plate described in Patent Document 2 allows the deck plates to engage with each other without notching the end close portion of the engagement rib, and the notable effect of notching the end close portion in advance is unnecessary. Play. However, the deck plate described in Patent Document 2 is a deck plate for a flat deck and is not currently used in a synthetic slab deck plate. Further, there is a problem in that the cross-sectional performance is resisted because the length of the end portion in the longitudinal direction is reduced overall.

  In addition to the above-described prior art, it is conceivable to simply crush the unevenness at the end of the buckling prevention rib. However, when the unevenness at the end is crushed, the length of the steel material spreads in the width direction, causing a problem of warping.

JP 2001-59305 A JP 2017-150132 A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to ensure rigidity in the vicinity of the end in the longitudinal direction and to prevent the concrete from leaking out. An object of the present invention is to provide a deck plate capable of preventing concrete from leaking out from an end portion in the longitudinal direction of the deck plate during installation without attaching a member, and a manufacturing method thereof.

  A deck plate according to a first aspect of the present invention is a deck plate for a concrete slab that is bent from a steel plate and formed into a rectangular shape in plan view, and includes a rectangular flat plate-shaped slab support portion that supports the lower surface of the concrete slab. The slab support portion is formed with a buckling prevention rib for preventing buckling along the longitudinal direction, and the buckling prevention rib is crushed at a predetermined position where the end portion in the longitudinal direction is separated from the end. The lower end of the buckling prevention rib and the lower end of the other part of the slab support portion are located on the same plane.

  The deck plate according to a second aspect of the present invention is characterized in that, in the first aspect, the buckling prevention rib is crushed at the same time when the end of the longitudinal direction of the deck plate is cut.

  The deck plate according to a third invention is characterized in that, in the first invention or the second invention, the buckling prevention rib is crushed at a longitudinal end portion thereof at a position of 20 mm to 30 mm from the end.

  The deck plate according to a fourth aspect of the present invention is the deck plate according to any one of the first to third aspects, wherein a pair of left and right engagement ribs are formed along the longitudinal edges of the slab support portion. Are provided with a flat web portion rising in the out-of-plane direction of the slab support portion, and a flange portion projecting in one direction out of the plane from the tip of the web portion, and each flange portion of the flange portion. Is characterized in that each web portion is projected in the same direction, and is formed with a folded portion that is inclined in the out-of-plane direction and prevents the web portion from shifting in the lateral direction.

  A deck plate manufacturing method according to a fifth aspect of the present invention includes a rectangular flat plate-like slab support portion that supports the lower surface of a concrete slab, and the slab support portion has a buckling prevention rib for preventing buckling along the longitudinal direction. A deck plate manufacturing method for manufacturing a formed deck plate, wherein the slab support portion is pressed to form the buckling prevention rib, and after the pressing step, the deck plate has a predetermined length. And in this cutting step, the longitudinal ends of the buckling prevention ribs are crushed by a jig that moves together with a cutting blade that cuts the deck plate simultaneously with the cutting. It is characterized by occlusion.

  According to 1st invention-4th invention, while ensuring the rigidity of the edge part vicinity of the longitudinal direction of a deck plate, without attaching another member for preventing concrete from leaking out, the length of a deck plate at the time of placement The concrete can be prevented from leaking from the end of the direction.

  In particular, according to the second invention, the buckling prevention ribs can be crushed and the deck plate can be cut in one press operation, and the manufacturing cost of the deck plate can be reduced.

  In particular, according to the third invention, the length of the end portion of the steel material can be prevented from spreading in the width direction, and the unevenness at the end of the buckling prevention rib can be crushed. For this reason, it is possible to prevent the warp from occurring at the end portion in the longitudinal direction of the deck plate.

  In particular, according to the fourth invention, it is possible to easily and reliably connect the deck plates without performing fixing work such as welding or caulking, and it is also possible to achieve a reduction in construction cost by simplifying construction. .

  According to the fifth aspect of the invention, it is possible to manufacture a deck plate that can secure rigidity in the vicinity of the end portion in the longitudinal direction and can prevent the concrete from leaking out from the end portion in the longitudinal direction of the deck plate at the time of placing. . In addition, the buckling prevention ribs can be crushed and the deck plate can be cut in a single pressing process, so that the manufacturing process can be shortened and the manufacturing cost of the deck plate can be reduced.

It is a perspective view which shows the deck plate which concerns on embodiment of this invention. It is a partial expansion perspective view which expands and shows the one end part of the longitudinal direction of a deck plate same as the above. It is a perspective view which shows the state which mounted the deck plate same as the above on H-section steel. It is a top view of a deck plate same as the above. It is a front view of a deck plate same as the above. It is the sectional view on the AA line of FIG. It is a side view which shows a deck plate same as the above.

  Hereinafter, a deck plate according to an embodiment of the present invention will be described in detail with reference to the drawings.

  A deck plate 1 according to an embodiment of the present invention is a deck plate for a concrete slab that is used as a driving form that does not require dismantling in order to construct a concrete slab of a structure such as a floor slab or roof slab of a building. .

  FIG. 1 is a perspective view showing a deck plate 1 according to an embodiment of the present invention, and FIG. 2 is a partially enlarged perspective view showing an enlarged one end portion of the deck plate 1 in the longitudinal direction. FIG. 3 is a perspective view showing a state in which the deck plate 1 is placed on the H-section steel. As shown in FIG. 3, the deck plate 1 is bridged between an H-section steel (section steel) H and a formwork, is used with concrete placed on the upper surface, and is integrated with the concrete after curing. It is a deck plate for synthetic slabs that bears tensile stress.

  This deck plate 1 is bent from a steel plate of about 0.8 mm to 1.6 mm subjected to rust prevention treatment such as hot dip galvanized steel plate (JIS G3302: SGCC, SGC340, SGH340), etc. It is a deck plate that is formed into a rectangular shape when viewed. In addition, although the length of the deck plate 1 changes with the length of the concrete slab to construct, and the thickness and use of a steel plate, generally it is the length of the range of about 0.8m-3.7m. .

  As shown in FIGS. 1 to 3, the deck plate 1 according to the present embodiment includes a rectangular flat plate-like slab support portion 2 that supports the lower surface of the concrete slab, and one surface (upper surface in the drawing) of the slab support portion 2. And a pair of left and right engaging ribs 4 that are formed along the longitudinal edges of the slab support portion 2 and that engage with each other. 5 or the like.

  Since the deck plate 1 is a composite slab deck plate, as shown in FIGS. 1 to 3, the deck plate 1 has ribs (reinforcing ribs 3 and engaging ribs 4 and 5) facing upward. The slab support 2 is placed on the H-section steel H.

(Slab support part)
As shown in FIGS. 1 and 2, the deck plate 1 is provided with a reinforcing rib 3 protruding from the center of the slab support portion 2, and the slab support portion 2 has a first rib with the reinforcing rib 3 as a boundary. It is divided into a slab support portion 21 and a second slab support portion 22. Of course, a plurality of reinforcing ribs 3 may be provided, and the slab support 2 may be divided into three or more.

  4 is a plan view of the deck plate 1, FIG. 5 is a front view of the deck plate 1, and FIG. 6 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 to 6, the slab support portion 2 is a pair of left and right flat plate members in which the first slab support portion 21 and the second slab support portion 22 are axisymmetric with respect to the reinforcing rib 3. In order to increase the bending rigidity, it is bent along the longitudinal direction to form irregularities.

  In the slab support portion 2 according to the present embodiment, as shown in FIG. 5 and the like, the first slab support portion 21 and the second slab support are used as buckling prevention ribs for preventing buckling so that the flat plate portion does not buckle. Two chevron ribs 23 each having a trapezoidal cross section are formed on each of the portions 22.

  For this reason, in the strength calculation of the deck plate 1 as a formwork at the time of construction until the strength of the concrete placed on the deck plate 1 is developed, the vertical cross section of FIG. 4 orthogonal to the longitudinal direction of the deck plate 1 The total cross-sectional area can be calculated as valid. As a result, the thickness of the deck plate can be reduced compared to the required strength, and the installation cost of the deck plate 1 including the transportation cost can be reduced.

  Of course, as the buckling prevention rib provided in the slab support portion 2, the chevron rib 23 having a trapezoidal cross section is illustrated, but a triangular cross section or a polygonal protrusion may be used. That is, the unevenness provided as the buckling prevention rib on the slab support portion 2 may be a ridge having a different shape or a chevron rib having an uneven shape as long as the unevenness is bent along the longitudinal direction in order to increase bending rigidity.

  Further, in the slab support portion 2 according to the present embodiment, as shown in FIGS. 2 and 4, the chevron ribs 23 are crushed at the positions where both ends in the longitudinal direction are separated from the ends by a predetermined position. Is formed. And the lower end of this obstruction | occlusion part 24 is located on the same plane as the lower end of the other site | part of the slab support part 2. FIG. For this reason, as shown in FIG. 3, the chevron ribs 23 are closed only by being placed on the H-section steel H. Therefore, it is possible to prevent the concrete from leaking out from the end portion in the longitudinal direction of the deck plate 1 at the time of placing without attaching another member for preventing the concrete from leaking out.

  In addition, when mounting the deck plate 1 on H-section steel, it is necessary to wrap 50 mm or more as an allowance. For this reason, when the closing part 24 is formed at a position exceeding the end part 30 mm in the longitudinal direction, the closing part 24 is too far away from the H-section steel and cannot be closed well.

  Moreover, it is preferable that this obstruction | occlusion part 24 is crushed and formed in the position spaced apart 20 mm or more from the end. This is because the change in the width of the steel material is absorbed by the chevron ribs 23 due to the malleability of the steel material and is blocked without spreading in the width direction. That is, unlike the case where the end portions are crushed by providing the chevron ribs 23 at a position separated by 20 mm or more from the ends, it is possible to prevent the end portions in the longitudinal direction from warping. In short, the position where the blocking portion 24 is provided is preferably 20 mm or more and 30 mm or less.

(Reinforcing rib)
As shown in FIGS. 5 and 6, the reinforcing rib 3 is vertically suspended at the center of one surface of the slab support portion 2 (between the first slab support portion 21 and the second slab support portion 22). It is comprised from the standing part 30 with which the flat steel plate overlapped, and the reinforcement part 31 of the cross-sectional triangle shape formed in the front-end | tip of this standing part 30, etc., and the bending rigidity with respect to the longitudinal direction of the slab support part 2 is improved. It has a function.

(First engagement rib)
The first engagement rib 4 that is the left-side engagement rib shown in FIG. 5 among the pair of engagement ribs rises perpendicularly to the surface of the first slab support portion 21 that is the out-of-plane direction of the slab support portion 2. A flat plate-like first web portion 40, a rising slope portion 41 (web portion) that rises from the tip of the first web portion 40 toward the inside (reinforcing rib 3 side, the same applies hereinafter) upward, and this rise A first flange portion 42 that continues horizontally from the tip of the inclined portion 41, an engagement inclined portion 43 that is inclined downward from the tip of the first flange portion 42, and an engagement inclined portion that extends from the tip of the engagement inclined portion 43. 43 and the like, and a guide inclined portion 44 inclined in the opposite direction.

  The first engagement rib 4 has a function of engaging the second engagement ribs 5 of other adjacent deck plates 1 to connect the deck plates 1 to each other.

  FIG. 7 is a side view showing the deck plate. As shown in FIG. 7 and the like, a plurality of embosses 45 projecting inward from a flat plate surface having a width of 8 mm and a total length of 40 mm are formed in parallel in the first web portion 40 at predetermined intervals. . This emboss 45 is a long hole-like convex line that is inclined up and down in a horizontal view, and has a function of preventing the deck plate 1 and the concrete placed inside thereof from being displaced at the interface between them. ing. Thus, since the convex stripes of the emboss 45 are inclined up and down, it is possible to prevent the emboss 45 from being displaced in either the vertical direction or the horizontal direction with one type of emboss.

  In addition, the corner | angular used as the junction part of each part of the 1st web part 40, the standing | upright inclination part 41, the 1st flange part 42, the engagement inclination part 43, and the guide inclination part 44 is all curved-surface-processed and bent, and a round surface angle | corner It has become.

  Further, in the deck plate according to the present invention, the rising inclined portion 41 that is a part of the web portion may not be inclined and may be continuous on the same plane as the first web portion 40, or a part of the flange portion. The guide inclined portion 44 may be omitted. However, like the deck plate 1, it is preferable to provide an engagement inclined portion 43 that is a folded portion of the flange portion. This is because if there is the engaging inclined portion 43 that is the folded portion of the flange portion, it is possible to lift one deck plate and engage the deck plates with each other.

(Second engagement rib)
The second engagement rib 5 that is the right engagement rib shown in FIG. 5 among the pair of engagement ribs rises perpendicularly to the surface of the second slab support portion 22 that is the out-of-plane direction of the slab support portion 2. A flat plate-like second web part 50, a climbing slope part 51 that rises inwardly from the tip of the second web part 50, a pressing slope part 52 that slopes downward from the tip of the climbing slope part 51, etc. , Is composed of.

  Further, the inclination height of the climbing inclination part 51 is higher than the inclination heights of the engagement inclination part 43 and the guide inclination part 44, and the inclination angle of the climbing inclination part 51 is between the engagement inclination part 43 and the guide inclination part 44. Unlike the inclination angles, they are looser than these inclination angles. For this reason, when the steel plate or the like on which the deck plate 1 is placed is slid in the horizontal direction, the climbing inclination part 51 easily gets over the engagement inclination part 43 and the guide inclination part 44, and the second engagement rib. 5 and the first engagement ribs of the other deck plates are easily engaged.

  In addition, the inclination of the pressing inclined portion 52 is inclined at substantially the same angle in the same direction as the engaging inclined portion 43. For this reason, when the second engagement rib 5 and the first engagement rib of another deck plate are engaged, the second engagement is caused by the inclination of the engagement inclined portion 43 and the pressing inclined portion 52 due to the weight of the deck plate 1. A load is applied in a direction in which the joint rib 5 and the first engagement rib of the other deck plate 1 are pressed, and the deck plates 1 can be engaged with each other. Accordingly, it is possible to prevent the cement component from being hardened due to the leakage of the nodule when the concrete is placed and the dirt that is difficult to peel off adheres to the lower surface of the deck plate.

  As shown in FIG. 2 and the like, a plurality of embosses 53 projecting inward from a flat plate surface having a width of 8 mm and a total length of 40 mm are parallel to the second web portion 50 at a predetermined interval, like the emboss 45. Are formed side by side. As shown in FIG. 2, the emboss 53 is a long hole-like ridge that is inclined up and down in the opposite direction to the emboss 45, and the deck plate 1 and the concrete placed inside thereof are an interface between the two. It has a function to prevent deviation. Further, since the emboss 53 and the emboss 45 are inclined in opposite directions, the effect of combining with the concrete that prevents the emboss 53 and the emboss 45 from being displaced together at the interface is further enhanced.

  As shown in each figure, like the first engagement rib 4, all of the corners that become the joint portions of the second web portion 50, the climbing inclination portion 51, and the pressing inclination portion 52 of the second engagement rib 5 are all. The curved surface is processed and bent to form round surfaces.

  Here, in the deck plate according to the present invention, the climbing inclination portion 51 which is a part of the flange portion may not be inclined but may be horizontal. However, like the deck plate 1, it is preferable to provide a pressing inclined portion 52 that is a folded portion of the flange portion. This is because it can be prevented from shifting in the short direction.

  Further, the horizontal distance between the first web portion 40 of the first engagement rib 4 and the turning point at which the inclination of the engagement inclined portion 43 which is the turning portion starts to be bent is the second web portion of the second engaging rib 5. The horizontal distance between the outer surface of 50 and the outer surface of the turning point at which the inclination of the pressing inclined portion 52 that is the turning portion starts is substantially equal. For this reason, even if there is some error in the processing accuracy of the inclination angle of the engaging inclined portion 43 and the pressing inclined portion 52, the second engaging rib 5 fits in the first engaging rib 4 perfectly. Since the first web portion 40 and the second web portion 50 are brought into contact with each other by surface contact with each other, it is possible to reliably prevent the leakage of the nose when placing concrete.

<Deck plate manufacturing method according to the embodiment>
Next, the manufacturing method of the deck plate which concerns on embodiment of this invention is demonstrated. A case where the above-described deck plate 1 is manufactured will be described as an example. Note that the deck plate manufacturing method according to this embodiment is different from the conventional deck plate manufacturing method only in that the end ribs 23 of the chevron ribs 23 are end-closed. The description of the process is omitted.

  In the manufacturing method of the deck plate according to the present embodiment, the reinforcing rib 3 and the first engaging rib 4 are bent from a thin steel plate of about 0.8 mm to 1.6 mm by roll forming as in the conventional manufacturing method. Then, a bending process for forming the second engagement rib 5 and the like is performed.

  In this step, the embossing 45 and the embossing 53 are simultaneously formed on the engaging ribs (the first engaging rib 4 and the second engaging rib 5), and the chevron ribs 23 that are buckling preventing ribs are formed on the slab support portion 2. A buckling prevention rib forming step is performed. Of course, this buckling prevention rib forming step can be a separate step before and after the bending step.

  Next, in the deck plate manufacturing method according to the present embodiment, a cutting process is performed in which the deck plate is cut into a predetermined rectangular shape in plan view.

  In this step, the deck plate is cut with a cutting blade that moves up and down by a hydraulic press operation. At this time, simultaneously with the pressing operation of cutting, the above-described closed portion 24 is formed by pressing the vicinity of both end portions of the chevron ribs 23 with a jig attached to a block mounted with a cutting blade that moves up and down by hydraulic pressure (see FIG. 2, see FIG.

  For this reason, the deck plate 1 which can prevent a concrete leaking out from the edge part of a longitudinal direction at the time of placement can be manufactured. Further, unlike the end-close process in the case of the conventional flat deck, the press operation for the end-close process is not necessary, and the manufacturing time of the deck plate can be shortened and the manufacturing cost can be reduced.

  In addition, as described above, the position where the blocking portion 24 is formed is a position that is 20 mm to 30 mm away from the ends of the both ends of the chevron rib 23 (see FIG. 4). For this reason, the change in the length due to the press work can be absorbed by the chevron ribs 23 due to the malleability of the steel material, and the chevron ribs 23 can be closed without spreading in the width direction. Therefore, unlike the case where the end portion is crushed, warping can be prevented from occurring at the end portion in the longitudinal direction. Further, there is no possibility that it will not be possible to prevent the concrete from leaking at the closing portion 24 because the allowance is too small.

  The reason why the closing portion 24 is positioned 20 mm to 30 mm apart from the end in a horizontal distance is that the hooking cost of the deck plate 1 to the H-shaped steel H is generally about 50 mm, and the distance within that which can be closed This is because the slope of the closing portion 24 formed by pressing is set to a distance that does not hang over the end of the deck plate 1.

<Operational effects of the deck plate according to the embodiment>
According to the deck plate 1 and the method for manufacturing the same according to the embodiment of the present invention described above, the deck plate can be placed at the time of placing without attaching a separate member for preventing leakage of concrete, such as a conventional small closing member. It is possible to prevent the concrete from leaking out from the end in the longitudinal direction. For this reason, the material cost of the deck plate 1 and the construction cost of the deck plate can be reduced.

  Further, according to the deck plate 1, the chevron ribs 23, which are buckling prevention ribs, can be crushed and the deck plate 1 can be cut by a single press operation, and the manufacturing cost of the deck plate 1 can be reduced. .

  In addition, since the closed portion 24 of the deck plate 1 is formed by crushing the chevron rib 23 at a position apart from the end instead of the end, the length of the end portion of the steel material is reduced by pressing. The end portion of the chevron rib 23 can be crushed by preventing spreading in the direction. For this reason, it is possible to prevent the warp from occurring at the end of the deck plate 1 in the longitudinal direction.

  Moreover, according to the deck plate 1 which concerns on embodiment of this invention, connection of deck plates 1 can be easily performed only by sliding horizontally, without lifting the deck plate 1. FIG. For this reason, the operation | work which fixes deck plates 1 mutually, such as welding and crimping, becomes unnecessary.

  And according to the deck plate 1, the slope of the engagement inclination part 43 and the slope of the press inclination part 52 are formed so that it may incline at the substantially same angle in the same direction. For this reason, the deck plates 1 to be engaged with each other are pressed against each other, and the cement component is hardened due to the leakage of the nose when the concrete is placed, thereby preventing dirt that is difficult to peel off from adhering to the lower surface of the deck plate. be able to.

  In addition, according to the deck plate 1, since the two chevron ribs 23 having a trapezoidal cross section are formed on the flat plate surface of the slab support part 2, the bending rigidity of the slab support part 2 is improved. Therefore, in the calculation of the strength of the deck plate as a formwork during construction until the strength of the concrete placed on the deck plate is developed, the total cross-sectional area of the vertical section perpendicular to the longitudinal direction of the deck plate is calculated as effective. can do. For this reason, as a result, the thickness of the deck plate can be reduced as compared with the required strength, and the installation cost of the deck plate including the transportation cost can be reduced.

  Furthermore, since the emboss 45 and the emboss 53 are formed on the deck plate 1, it is possible to prevent the deck plate 1 and the concrete placed inside thereof from being displaced at the interface between them.

  As described above, the deck plate and the manufacturing method thereof according to the embodiment of the present invention have been described in detail. However, each of the above-described or illustrated embodiments shows one embodiment embodied in carrying out the present invention. Not too much. Therefore, the technical scope of the present invention should not be limitedly interpreted by these.

  In particular, the case where the deck plate is bridged between the steel shapes such as H-shaped steel has been described as an example, but it goes without saying that the deck plate may be bridged between the molds such as the wooden formwork such as the foundation. Absent. Moreover, although the case where both ends of the chevron rib are closed is illustrated, it is only necessary that one end is closed, such as a slab facing the outer wall, and both ends are not necessarily closed.

1: Deck plate 2: Slab support portion 21: First slab support portion 22: Second slab support portion 23: Yamagata rib (buckling prevention rib)
24: Blocking part 3: Reinforcing rib 30: Upright part 31: Reinforcing part 4: First engaging rib 40: First web part 41: Upright inclined part 42: First flange part 43: Engaging inclined part (folded part) )
44: Guide inclined portion 45: Emboss 5: Second engagement rib 50: Second web portion 51: Riding over inclined portion 52: Pressing inclined portion (folded portion)
53: Embossed H: H-section steel (section steel)

Claims (5)

A deck plate for a concrete slab that is bent from a steel plate and formed into a rectangular shape in plan view,
A rectangular flat slab support that supports the lower surface of the concrete slab is provided,
In this slab support part, buckling prevention ribs for preventing buckling are formed along the longitudinal direction,
The buckling prevention rib is crushed at a predetermined position where the end portion in the longitudinal direction is separated from the end, and the lower end of the buckling prevention rib and the lower end of the other portion of the slab support portion are located on the same plane. Deck plate characterized by The deck plate according to claim 1, wherein the buckling prevention rib is crushed at the same time when the end of the deck plate is cut at the end of the deck plate. The deck plate according to claim 1 or 2, wherein the buckling prevention rib is crushed at an end portion in a longitudinal direction at a position of 20 mm to 30 mm from the end. A pair of left and right engagement ribs are formed along the edges on both sides of the longitudinal direction of the slab support part,
These engaging ribs are each provided with a flat web portion rising in the out-of-plane direction of the slab support portion, and a flange portion projecting in one direction out of the plane from the tip of the web portion,
Each flange portion of the flange portion protrudes in the same direction with respect to each web portion, and is formed with a folded portion that is inclined in the out-of-plane direction and prevents shifting in the short direction. The deck plate according to any one of claims 1 to 3. A deck plate for manufacturing a deck plate having a rectangular flat plate-shaped slab support portion for supporting a lower surface of a concrete slab and having a buckling prevention rib formed in the slab support portion for preventing buckling along the longitudinal direction. A manufacturing method comprising:
A buckling prevention rib forming step of bending the slab support portion to form the buckling prevention rib;
A cutting step of cutting the deck plate to a predetermined length after the buckling prevention rib forming step,
In this cutting step, the longitudinal end of the buckling prevention rib is crushed and closed by a jig that moves together with a cutting blade that cuts the deck plate simultaneously with cutting. .

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