JP6437625B1 - 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.
In a concrete slab deck plate 1 that is bent from a steel plate and formed into a rectangular shape in plan view, a rectangular flat plate slab support portion 2 that supports a lower surface of the concrete slab, and a slab support portion 2 A reinforcing rib 3 projecting along the longitudinal direction from one side to the out-of-plane direction, and a rising portion 30 rising in the out-of-plane direction on the reinforcing rib 3, and a cross section formed at the tip of the rising portion 30 A triangular reinforcing portion 31 is provided, and a longitudinal end portion 31a of the reinforcing portion 31 is closed in a Y shape.
[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.

  Conventionally, in this type of synthetic slab deck plate, it is necessary to fit a small closing member to the end of the deck plate in order to prevent the concrete from leaking from the end of the deck plate in the longitudinal direction when placing concrete. there were.

  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 order to solve such problems, Patent Document 2 discloses a deck plate proposed by the present applicant, in which reinforcing ribs having a triangular cross section are crushed from both sides in the deck plate width direction and closed in an I shape. (Refer to claim 1 of claim 2 of patent document 2, paragraphs [0028] to [0036] of the specification, FIG. 1, FIG. 3, FIG. 4 of the drawing, etc.).

  The deck plate described in Patent Document 2 has a remarkable effect that it is not necessary to close a small mouth like the end opening obturator described in Patent Document 1. However, as shown in FIG. 15, in order to crush the reinforcing ribs from both sides in the deck plate width direction and close them in an I shape, the reinforcing ribs having a triangular cross section are sandwiched from both sides separately from the deck plate cutting step. There is a problem that a crushing process is required, and the manufacturing process and manufacturing time increase, resulting in an increase in manufacturing cost.

  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 3 discloses a deck plate that has been proposed by the applicant of the present application and provided with an end-close portion that does not require a notch in an engagement rib (claim 1, claim 3 of patent document 3). (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 3 is capable of engaging with each other even if the end ribs of the engagement rib are not cut out, so that the notch in advance of the end close part is not required. Play. However, as shown in FIG. 16, the end portion in the longitudinal direction of the deck plate crushes both the engaging rib and the reinforcing rib, so that there is a problem that the cross-sectional rigidity of the end closed portion is lower than that in the case of non-processing. .

JP 2001-59305 A JP 2014-190074 A JP 2017-150132 A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object thereof is to ensure rigidity near the end in the longitudinal direction and at the same time in the longitudinal direction of the deck plate when placing concrete. It is an object of the present invention to provide a deck plate capable of preventing the concrete from leaking out from the end portion thereof 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 a rectangular flat slab support portion that supports the lower surface of the concrete slab, A reinforcing rib projecting along the longitudinal direction from one side of the slab support portion to the out-of-plane direction, and the reinforcing rib is formed at an upright portion rising in the out-of-plane direction and at a tip of the upright portion. And a reinforcing portion having a triangular cross section, and the reinforcing portion has a longitudinal end closed in a Y shape.

  The deck plate according to a second aspect of the present invention is characterized in that, in the first aspect, the reinforcing portion is closed in a Y shape by being crushed at the same time when the end of the deck plate is cut at the end. To do.

  The deck plate according to a third aspect of the present invention is characterized in that, in the first aspect or the second aspect, the reinforcing portion is crushed only in a range within 70 mm at a horizontal distance 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 a folded-back portion that protrudes in the same direction with respect to each web portion and that is inclined in the out-of-plane direction and prevents shifting in the lateral direction is formed.

  The deck plate according to a fifth aspect of the present invention is the deck plate according to any one of the first to third aspects of the present invention, wherein the longitudinal end of the deck plate is further closed in a Y shape along the longitudinal edge of the slab support. The reinforcing ribs are formed, and a pair of left and right engaging claws are formed along the longitudinal edges of the slab support portion.

  A deck plate manufacturing method according to a sixth aspect of the invention includes a rectangular flat plate-like slab support portion that supports the lower surface of a concrete slab, and a cross-section projecting along the longitudinal direction from one side of the slab support portion toward the out-of-plane direction. A deck plate manufacturing method for manufacturing a deck plate having a reinforcing rib having a triangular shape, the reinforcing rib forming step for forming the reinforcing rib, and the deck plate after the reinforcing rib forming step Cutting in a rectangular shape in plan view, and in this cutting step, the longitudinal ends of the reinforcing ribs are moved by a jig that moves together with a cutting blade that cuts the deck plate simultaneously with the cutting. It is characterized by being pressed and closed in a Y shape.

  According to 1st invention-5th invention, the rigidity of the edge part vicinity of the longitudinal direction of a deck plate can be ensured, without substantially reducing the cross-sectional performance of the obstruction | occlusion part by obstruct | occluding in Y shape. Moreover, it is possible to reduce the number of parts and the number of parts to which another member for preventing the concrete from leaking is attached, and to prevent the concrete from leaking from the end portion in the longitudinal direction of the reinforcing rib at the time of placing. For this reason, the material cost of the deck plate and the construction cost of the deck plate can be reduced.

  In particular, according to the second invention, the reinforcing portion of the reinforcing rib can be crushed and the deck plate can be cut by a single pressing operation, and the manufacturing cost of the deck plate can be reduced.

  In particular, according to the third aspect of the invention, it is possible to suppress the deterioration of the cross-sectional performance of the deck plate due to the crushing of the reinforcing rib as much as possible.

  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. .

  In particular, according to the fifth aspect, there is no need to attach a separate member for preventing the concrete from leaking out, such as a conventional small mouth closing member. For this reason, the material cost of the deck plate and the construction cost of the deck plate can be reduced.

  According to the sixth 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 from the end portion in the longitudinal direction of the deck plate at the time of placing. . In addition, the reinforcing portions of the strong 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 1st 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. FIG. 3 is an end view taken along line AA in FIG. 2. FIG. 3 is an end view taken along line BB in FIG. 2. It is the CC sectional view taken on the line of FIG. It is a side view which abbreviate | omits the reinforcement rib of the deck plate same as the above, and shows it. It is a side view which abbreviate | omits the deck plate same as the above and shows. It is a partial enlarged plan 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 deck plate which concerns on 2nd 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. FIG. 12 is an end view taken along line DD of FIG. 11. It is the front view which looked at the same deck plate from the edge part along the longitudinal direction. It is a partial expanded sectional view which expands and shows the engaging part of the engaging claw which connects adjacent deck plates. It is a partial expanded sectional view which expands and shows the reinforcing rib crushed and obstruct | occluded by I shape from right and left by the end closing process in the conventional deck plate. It is a partial expanded sectional view which expands and shows the reinforcement rib which was crushed flatly from the upper part by the end-close process in the conventional deck plate, and was obstruct | occluded.

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

[First Embodiment]
First, the deck plate according to the first embodiment of the present invention will be described with reference to FIGS. The deck plate 1 according to the first 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. It is.

  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.

  The deck plate 1 is bent by a roll forming or the like from a steel plate of about 0.8 mm to 1.6 mm subjected to rust prevention treatment such as a hot dip galvanized steel plate (JIS G3302: SGCC, SGC340, SGH340). It is a deck plate formed into a rectangular shape in plan view of the length. 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 an end view taken along line AA in FIG. 2, FIG. 5 is an end view taken along line BB, and FIG. 6 is an end view taken along line CC. 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 part 2 according to the present embodiment, as shown in FIG. 4 and the like, the first slab support part 21 and the second slab support part 22 are convex strips having a trapezoidal cross section as the unevenness to increase the bending rigidity. A certain angle rib 23 is formed two by two.

  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 projections and depressions provided on the slab support 2, the chevron ribs 23 that are trapezoidal cross-section ridges are illustrated, but ridges having a triangular or polygonal cross-section may be used. That is, the unevenness provided on the slab support portion 2 may be a protrusion or recess rib having another shape as long as it is bent along the longitudinal direction in order to increase bending rigidity.

(Reinforcing rib)
As shown in FIG. 4 and the like, 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). And a reinforcing portion 31 having a triangular cross section formed at the tip of the upright portion 30 and the like, and has a function of improving the bending rigidity of the slab support portion 2 in the longitudinal direction. Have.

  FIG. 7 is a side view showing the reinforcing ribs of the deck plate with the middle omitted. As shown in FIGS. 7, 1, and 2, the reinforcing portion 31 is shown in FIG. 6, in which both end portions 31 a in the longitudinal direction are gradually crushed from above through a transition portion 31 b (see also FIG. 5). Thus, the cross section is closed in a Y-shape. For this reason, the both ends 31a, which are the closed portions of the reinforcing rib 3, also maintain the Y-shaped shape that does not reduce the distance from the neutral axis, which is advantageous with respect to bending stress. The cross-sectional performance such as the cross-section coefficient is hardly deteriorated.

  In addition, the fresh concrete that has entered the reinforcing portion 31 from the longitudinal end portion of the deck plate 1 at the time of placing at the closed end portions 31a is transferred from the lower surface of the deck plate 1 to the two steel plates of the upright portion 30. Leakage can be prevented. Therefore, it is not necessary to attach a separate member for closing the small rib to the end portion of the reinforcing rib 3, and the labor and the number of members for closing the small mouth can be reduced as compared with the conventional case.

  In order to prevent fresh concrete from entering the reinforcing portion 31 when placing, the range in which the reinforcing portion 31 is crushed is within 70 mm in horizontal distance from the ends of both end portions 31a including the transition portion 31b. A range of only is sufficient. Moreover, since the range which the rigidity of the edge part of the reinforcement part 31 falls will increase when the range which crushes the reinforcement part 31 exceeds 100 mm, it is unpreferable. Therefore, the range for crushing the reinforcing portion 31 is preferably 100 mm or less, and more preferably 70 mm or less. Moreover, the lower limit of the range which can crush the present reinforcement part 31 is 50 mm or more.

(First engagement rib)
The first engagement rib 4 that is the left-side engagement rib shown in FIG. 4 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. 8 is a side view showing the deck plate. As shown in FIG. 8 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 a predetermined interval. . 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 which is the right engagement rib shown in FIG. 4 among the pair of engagement ribs rises perpendicularly to the surface of the second slab support portion 22 which 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.

[Second Embodiment]
Next, a deck plate according to a second embodiment of the present invention will be described with reference to FIGS. The difference between the deck plate 1 ′ according to the second embodiment of the present invention and the deck plate 1 according to the first embodiment described above is that the engagement rib is eliminated and a reinforcement rib or an engagement claw is formed. Therefore, the difference is mainly demonstrated, the same structure attaches | subjects the same code | symbol and abbreviate | omits description.

  FIG. 10 is a perspective view showing a deck plate 1 ′ according to the second embodiment of the present invention, and FIG. 11 is a partially enlarged perspective view showing an enlarged end portion of the deck plate 1 ′ in the longitudinal direction. . 12 is an end view taken along the line DD of FIG. 10, and FIG. 13 is a front view of the deck plate 1 'as viewed from the end along the longitudinal direction.

  Similar to the deck plate 1, the deck plate 1 'according to the present embodiment is a synthetic deck plate for a concrete slab that is bent from a hot-dip galvanized steel sheet by roll forming or the like and formed into a rectangular shape. As shown in FIGS. 10 to 13, the deck plate 1 ′ includes a rectangular flat slab support portion 2 ′ that supports the lower surface of the concrete slab, and a longitudinal direction perpendicular to one surface of the slab support portion 2 ′. And the above-described reinforcing rib 3 and a pair of left and right engaging claws 4 'and 5' formed along the edges on both sides of the slab support portion 2 '. Yes.

(Slab support part)
As shown in FIGS. 10 to 14, the deck plate 1 ′ is provided with two reinforcing ribs 3 protruding from the center and left edge of the slab support portion 2 ′. It is divided into a first slab support portion 21 ′ and a second slab support portion 22 ′. Of course, the slab support 2 'may be divided into three or more with the reinforcing rib 3 as a boundary.

  As shown in FIGS. 12 and 13, the slab support portion 2 ′ includes a pair of left and right slab support portions 21 ′ and a second slab support portion 22 ′ that are line symmetrical with respect to the central reinforcing rib 3. The plate-shaped member is bent along the longitudinal direction in order to increase the bending rigidity, thereby forming irregularities.

  In the slab support portion 2 ′ according to the present embodiment, as shown in FIG. 12 and the like, the first slab support portion 21 ′ and the second slab support portion 22 ′ have an inverted trapezoidal cross section as the unevenness that increases the bending rigidity. The ant leg ribs 23 ′ that are (ant leg-like) ridges are formed one by one.

  Of course, as the projections and depressions provided on the slab support portion 2 ′, the dovetail ribs 23 ′, which are ridges having an inverted trapezoidal section, are exemplified, but ridges having a triangular section or polygonal section may be used. That is, the unevenness provided on the slab support portion 2 ′ may be a protrusion or recess rib having another shape as long as it is bent along the longitudinal direction in order to increase bending rigidity.

(Reinforcing rib)
The reinforcing rib 3 is composed of the upright portion 30, the reinforcing portion 31, and the like, and is the above-described reinforcing rib 3 having a function of improving the bending rigidity in the longitudinal direction of the slab support portion 2 ′ (FIG. 10). (See FIG. 13). The deck plate 1 ′ is different from the deck plate 1 in that the first engaging rib 4 formed at the left end (left edge) of the slab support portion 2 becomes the reinforcing rib 3, and instead, the side of the upright portion 30. The engagement claw 4 'is formed on the surface.

  The reinforcing ribs 3 are both Y-shaped in cross section, with both end portions 31a in the longitudinal direction being gradually crushed from above through the transition portions 31b, similarly to the reinforcing ribs 3 of the deck plate 1. It is blocked (see FIGS. 10, 11, and 13). For this reason, the cross-sectional performance such as the cross-sectional modulus of the closed portion hardly deteriorates.

  In addition, the fresh concrete that has entered the reinforcing portion 31 from the longitudinal end portion of the deck plate 1 ′ at the time of placement at the closed end portions 31 a passes between the two steel plates of the upright portion 30, and the bottom surface of the deck plate 1. It can be completely prevented from leaking out. Therefore, it is not necessary to attach a separate member for closing the small opening not only at the end of the reinforcing rib 3 but also at the end of the deck plate 1 ′. For this reason, even if compared with the deck plate 1 which concerns on 1st Embodiment, the work effort of a small mouth closing can be eliminated.

(Engaging claw)
As shown in FIGS. 11 and 12, a claw-shaped first engaging claw 4 ′ having an open top is formed along the left end edge of the slab support portion 2 ′, and the right end of the slab support portion 2 ′ is formed. A claw-like second engaging claw 5 ′ having an open bottom is formed along the edge.

  FIG. 14 is a partial enlarged cross-sectional view showing an enlarged engagement portion of engagement claws 4 ′ and 5 ′ that connect adjacent deck plates 1 ′. As shown in FIG. 14, the second engaging claws 5 ′ adjacent to the first engaging claws 4 ′ have a function of engaging with each other and connecting the deck plates 1 ′ to the left and right. For this reason, the operation | work which engages engagement claws easily and fixes, such as welding and crimping, becomes unnecessary.

  In the deck plate 1 ′ according to the present embodiment, as shown in FIG. 14 and the like, the rising portion 30 where the two steel plates overlap cannot be simultaneously formed with the embossing of the reinforcing rib 3 at the time of roll forming. Unlike the plate 1, the emboss 45 and the emboss 53 are not formed. Of course, embossing can be performed as a separate process.

<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 the present embodiment is different from the conventional deck plate manufacturing method only in that the end of the reinforcing rib 3 is processed. 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 step, which is a reinforcing rib forming step for forming the second engaging rib 5 (engaging claws 4 ′, 5 ′ in the case of the deck plate 1 ′) and the like, is performed.

  In this step, the engagement ribs (first engagement rib 4 and second engagement rib 5) are simultaneously embossed 45, emboss 53, and the slab support portion 2 is chevron rib 23 (in the case of deck plate 1 ′, dovetail). The ribs 23 ') are also formed by roll forming. Of course, this process can be a separate process before and after the folding process. In the case of the deck plate 1 ', embossing is not performed.

  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 cutting press operation, the vicinity of both ends 31a of the reinforcing portion 31 is pressed in the longitudinal direction of the reinforcing rib 3 by a jig attached to a block equipped with a cutting blade that moves up and down by hydraulic pressure. Only the end is closed in a Y shape (see FIGS. 2, 6, 11, 13, etc.).

  For this reason, the deck plate 1 which can prevent concrete leaking out from the edge part of the longitudinal direction of the reinforcement rib 3 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 range in which the reinforcing portion 31 is crushed is only within the range of 50 mm or more and 100 mm or less, preferably 70 mm or less in horizontal distance from the ends of both end portions 31a including the transition portion 31b. For this reason, the cross-sectional performance of the reinforcing rib 3 hardly decreases.

<Operational effects of the deck plate according to the embodiment>
According to the deck plate 1 according to the first embodiment of the present invention described above, the deck plate 1 ′ according to the second embodiment, and the manufacturing method thereof, the placement position and the number of parts of the small-mouth closing member are reduced and placed. Sometimes the concrete can be prevented from leaking from the longitudinal ends of the deck plate. In particular, according to the deck plate 1 ′ according to the second embodiment, it is not necessary to attach a separate member for preventing the concrete from leaking out, such as a conventional small mouth closing member. For this reason, the material cost of the deck plates 1 and 1 ′ and the construction cost of the deck plate can be reduced.

  In addition, unlike the conventional flat deck, there is no need to crush the reinforcing rib 3 over a wide range. For this reason, it is possible to secure the rigidity in the vicinity of the end portion in the longitudinal direction of the deck plates 1 and 1 ′ and suppress the deterioration of the cross-sectional performance of the deck plates 1 and 1 ′ as much as possible.

  Further, according to the deck plate 1, the deck plates 1 can be easily connected to each other simply by sliding the deck plate 1 horizontally without lifting it. For this reason, the operation | work which fixes deck plates 1 mutually, such as welding and crimping, becomes unnecessary. Further, even for the deck plate 1 ′, an operation of simply engaging the engaging claws and fixing them by welding or caulking is 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 plates 1, 1 ', the slab support portions 2, 2' are formed with the trapezoidal cross-section chevron ribs 23 and the inverted cross-section trapezoidal ribs 23 '. The bending rigidity of the support portions 2 and 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 thing which the both ends of the reinforcement rib of the deck plate were obstruct | occluded was illustrated, one end should just be obstruct | occluded, such as a slab which faces an outer wall, and both ends need not necessarily be obstruct | occluded.

1, 1 ': Deck plates 2, 2': Slab support portions 21, 21 ': First slab support portions 22, 21': Second slab support portions 23: Angle ribs 23 ': Dovetail ribs 3: Reinforcement ribs 30 : Upright part 31: Reinforcement part 31a: Both ends 31b: Transition part 4: 1st engagement rib 40: 1st web part 41: Standing inclination part 42: 1st flange part 43: Engagement inclination part (folding part)
44: Guide inclined portion 45: Emboss 4 ': First engagement claw (engagement claw)
5: 2nd engagement rib 50: 2nd web part 51: Riding over inclination part 52: Pressing inclination part (folding part)
53: Emboss 5 ': Second engaging claw (engaging claw)
H: H section steel (section steel)

Claims (6)

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 plate-like slab support part that supports the lower surface of the concrete slab, and reinforcing ribs that protrude in the longitudinal direction from one side of the slab support part toward the out-of-plane direction,
The reinforcing rib is provided with an upright portion rising in an out-of-plane direction and a reinforcing portion having a triangular cross section formed at the tip of the upright portion,
The deck plate, wherein the reinforcing portion has a longitudinal end closed in a Y shape. 2. The deck plate according to claim 1, wherein the reinforcing portion is closed in a Y shape by being crushed at the end of the longitudinal direction at the same time when the end of the deck plate is cut. 3. The deck plate according to claim 1, wherein the reinforcing portion is crushed at an end in a longitudinal direction only within a range of 100 mm or less in horizontal distance 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. The reinforcing ribs whose longitudinal ends are closed in a Y-shape are formed along the edge on one longitudinal side of the slab support portion, and left and right along the longitudinal edges of the slab support portion. The deck plate according to any one of claims 1 to 3, wherein a pair of engaging claws are formed. A reinforcing rib having a rectangular flat plate-like slab supporting portion that supports the lower surface of the concrete slab, and a reinforcing portion having a triangular cross-section projecting along the longitudinal direction from one side of the slab supporting portion toward the out-of-plane direction. A deck plate manufacturing method for manufacturing a deck plate comprising:
A bending step of bending the steel plate to form the reinforcing rib;
A cutting step of cutting the deck plate to a predetermined length after the bending step,
In this cutting process, the end of the reinforcing rib in the longitudinal direction is pressed by a jig that moves together with a cutting blade that cuts the deck plate at the same time as cutting, and is closed in a Y shape. Production method.

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