JP4711294B2 - Deck plate - Google Patents

Description

  The present invention is a so-called intermediate end closed (hereinafter referred to as “enclosure”) type in which a beam placing portion for closing an end portion is formed at an intermediate height position between a crest surface and a trough surface by crushing the end portion in the deck plate length direction. Regarding deck plate.

  As shown in FIG. 7, a deck plate 10 in which a horizontal peak surface 2 and a valley surface 3 continuously form a trapezoidal corrugated cross-sectional shape on a slope 4 (the illustrated example is a case of two peaks) constructs a concrete floor. Widely used as a throwaway formwork. When this type of deck plate 10 is used as it is as a formwork without being subjected to the end closing process (the deck plate 10A in FIG. 8 (a)), the concrete flows out from the end opening (the lower part of the mountain surface). Therefore, the end opening is closed with a small cover plate, or an encro deck plate as shown in FIGS. 8B to 8D, that is, an end closing deck plate 10B, 10C, 10D is used.

The deck plate 10B in FIG. 8 (b) squeezes the end portion in the longitudinal direction of the deck plate from above (so that the crest surface 2 comes to the trough surface 3 side), and the beam placing portion 15 'with the end clogged. It is a normal Enclo deck plate.
In the deck plate 10C of FIG. 8 (c), the end portion of the beam mounting portion 15 is closed by crushing the end portion in the length direction from the bottom (so that the valley surface 3 is on the mountain surface 2 side). Is a so-called reverse-enclosure type deck plate. This reverse-enclosure-type deck plate 10C has a lower height position of the mountain surface 2, so that the floor surface height position of the constructed concrete floor can be adjusted. There are advantages such as being able to be lowered and saving the floor height of the building.
The deck plate 10D of FIG. 8 (d) is formed by crushing the end in the length direction and forming a beam mounting portion 15 with an end closed at an intermediate height position between the peak surface 2 and the valley surface 3. This is a so-called intermediate enclosure type deck plate. This intermediate enclosure type deck plate 10 </ b> D can secure the concrete thickness on the beam 9 while having the advantage of floor height saving.

In the conventional intermediate enclosure type deck plate, the entire beam mounting portion is flatly crushed like the beam mounting portion 15 shown in FIG. It was. That is, the length L ₁ ′ in the deck plate length direction of the flat area 15a on the lower surface side of the beam placing portion 15 is equal to the length L ₂ ′ in the deck plate length direction of the flat area 15b on the upper surface side. Yes, the entire beam mounting part was a flat part.
FIGS. 2 and 4 of JP-A-56-59957 Figures 2, 4, 6, and 8 Figure 4 of Japanese Patent Publication 2-60819 2 and 4 of Japanese Patent No. 2759580 (Japanese Patent Laid-Open No. 5-311794)

  Each of the above-mentioned conventional intermediate enclo deck plates crushes the entire beam mounting portion flatly. When crushing so that the bottom surface is flat, if it is pressed normally, the top and bottom surfaces are naturally flat. This is because the entire beam mounting portion becomes flat (the flat areas 15b and 15a on the upper and lower surfaces are the same length in the deck plate length direction), and the crushing process leaves an inclined surface on one side. This is because it is not easy, and unless there is a special reason, the usual easy press working is adopted.

By the way, in the case of an intermediate enclosure type deck plate (the same applies to the reverse enclosure type), when the lower inclined surface adjacent to the flat part (beam mounting part) hits the beam when it is spanned between the beams. In order to avoid this, the flat portion length L ′ (= L ₁ ′ = L ₂ ′) is slightly longer as an adjustment margin in the deck plate length direction. Therefore, when the deck plate is spanned between the beams, an offset (a portion indicated by m ′ in FIG. 8 (d)) is generated in which a part of the beam placing portion is detached from the beam. May become large.

  As described above, the conventional intermediate enclosure type deck plate has the entire beam mounting portion 15 as a flat portion. Therefore, when concrete is placed during floor construction and a load is applied to the deck plate, the load There is a possibility that the rigidity of the offset portion m ′ deviated from the beam 9 of the beam mounting portion 15 is insufficient with respect to the bending moment due to (details will be described later in comparison with the present invention (FIG. 6)).

  Therefore, to prevent the offset dimension m ′ from becoming so large as to cause insufficient rigidity, the length of the beam mounting portion is reduced (the flat portion length L ′ is reduced), the plate thickness of the deck plate, and the cross-sectional shape itself. However, in the former case, the adjustment cost for the beam span is small, so that the workability is deteriorated, and in the latter case, there is a problem that the economic efficiency is lacking.

  The present invention has been made in view of the above circumstances, and is an intermediate enclosure type that can solve the problem of insufficient rigidity of the offset portion where the beam placement portion is detached from the beam when spanned between the beams without impairing workability and economy. The purpose is to provide a deck plate.

The present invention that solves the above problems is a deck plate that is used across a beam of a building, in which a horizontal mountain surface and a valley surface continuously form a trapezoidal corrugated cross-sectional shape on a slope,
The entire deck plate width direction at the end of the deck plate length direction is crushed to form an end-closed beam mounting portion at an intermediate height position between the peak surface and the valley surface, and the beam mounting portion is , the underside of which deck plate length direction L ₂ of the plateau of the upper surface relative to the deck plate longitudinal length L ₁ of the plateau is shorter, the inclined surface of the upper toward the mountain face from the upper surface plateaus Is formed to extend from the position of the upper surface of the beam to the center side in the deck plate length direction from the edge of the upper surface of the beam, and the position of the upper edge of the upper inclined surface is greater than the rear end position A of the lower flat surface area. It is characterized by being on the center side in the deck plate length direction .

Claim 2 is the deck plate of claim 1,
Deck plate longitudinal length L ₂ of the plateau on the upper surface side of the Harino part is characterized in that it is a 10 to 30 mm.

A third aspect of the present invention is the deck plate according to any one of the first and second aspects, wherein an upward inclination angle θ _U from the flat area on the upper surface of the beam mounting portion toward the mountain surface is tan ⁻¹ θ _U = 1/4 to 1/2. The downward inclination angle θ _L from the flat surface of the lower surface of the beam mounting portion toward the valley surface is tan ⁻¹ θ _L = 1/4 to 1/2.

A fourth aspect is characterized in that the deck plate according to any one of the first to third aspects is applied to a deck plate having a peak height of 80 to 160 mm.

Beam mounting portion of the deck plate of the present invention, the plateau of the upper surface to the lower surface of the plateau rather short deck plate length direction and the inclined surface of the upper toward the mountain face from the top plateau, the beam It is formed to extend from the position of the upper surface to the center side in the deck plate length direction from the edge of the upper surface of the beam, and the position of the upper edge of the upper inclined surface is longer than the depth edge position A of the lower flat surface. Since it is on the center side in the vertical direction, the upper part in the vicinity of the rear end of the lower flat area of the beam mounting portion is an inclined surface on the way from the upper flat area to the mountain surface. That is, the cross section near the far end of the lower flat surface has a cross-sectional shape having a certain height.
Therefore, the height of the cross-section of the offset part that is detached from the beam of the beam mounting part when spanned between the beams is the conventional intermediate enclosure type where the entire beam mounting part is a flat part and has a height corresponding to the flat part thickness. Compared to other deck plates, the section modulus is high (having high section performance).
Therefore, the problem that the rigidity of the offset part of the beam mounting part is insufficient with respect to the bending moment due to the load of the cast concrete at the time of construction is solved without impairing the workability and economy, that is, the length of the beam mounting part is increased. This can be easily avoided without reducing the size or increasing the rigidity of the deck plate itself.
Moreover, since it is an intermediate enclosure type deck plate, it is effective in saving the floor height of the building.

Shortening the length L ₂ of the upper surface plateau Harino part will lead to increasing the inclined surface toward the mountain face from the top plateau, the lead to increasing the section modulus of the offset portion Although it is appropriate to reduce the length L ₂ of the plateau of the upper surface side as much as possible, to close the ends with extremely short dimensions, etc. and the length e.g. zero top plateau Harino portion Pressing is a little difficult. The length of the upper flat region of 10 to 30 mm according to claim 2 is an appropriate dimension for enabling the end portion to be closed by pressing.

  When the inclination angle is set as in the third aspect, the slip between the base plate and the mold during the end closing process can be prevented, and the occurrence of slip damage can be prevented.

  Although the length of the upper surface flat area of the beam mounting portion is zero and the press working to close the end is slightly difficult, the length of the upper surface flat area of 10 to 30 mm according to claim 4 is obstructed by the press working. The dimensions are appropriate to enable.

As described in claim 4 , since the deck plate having a high peak height is usually used when the beam span is long and a large bending moment is generated, the bending moment applied to the offset portion is also large. The advantage is especially demonstrated.

  Hereinafter, embodiments of the deck plate of the present invention will be described with reference to FIGS.

  FIG. 1 (a) is a side view showing the deck plate 1 according to an embodiment of the present invention as it is spanned between beams, FIG. 1 (b) is an enlarged view of the vicinity of the end of FIG. 1 (b), and FIG. 1 (a) AA enlarged cut end view (thickness is omitted), FIG. 3 is a BB enlarged arrow view of FIG. 1 (a) (however, the beam is not shown), FIG. 4 is the deck plate 1 It is a perspective view of the edge part vicinity.

  As shown in FIG. 2, the deck plate 1 has a horizontal peak surface 2 and a valley surface 3 continuously formed by a slope 4 to form a trapezoidal corrugated cross-sectional shape. , Having grooves 2a or ridges 3a for increasing the rigidity of the crest or trough, and having engaging portions 6 and 7 for engaging adjacent deck plates 1 at both ends in the width direction. . The deck plate 1 in the illustrated example is a deck plate for a composite floor slab that is integrated with concrete and bears a load, and has a step portion 4a on a slope 4, and this step portion 4a allows the The hardened concrete and the deck plate 1 are integrated.

This deck plate 1 is a so-called intermediate-enclosure type deck plate, which crushes the entire deck plate width direction at the end of the deck plate in the length direction so that the beam mounting portion 5 which is closed at the end is replaced with the mountain surface 2 and the valley surface. 3, in the present invention, as shown in FIGS. 1, 4, etc., the length L in the deck plate length direction of the flat area 5 a on the lower surface of the beam placing portion 5 is formed. ₁ , the length L ₂ in the deck plate length direction of the upper flat area 5 b is shorter than the upper flat area 5 b, and the upper inclined surface 5 d from the upper flat area 5 b toward the mountain surface 2 is The upper inclined surface 5d is formed so as to extend from the position of the upper surface to the center side in the deck plate length direction from the edge of the upper surface of the beam (the left end position of the dimension line indicating the offset dimension m in FIG. 1B). The position of the upper edge of the back edge position A of the lower flat surface 5a The center side of the deck plate length direction Ri. In this case, the crushing of the end of the deck plate is performed by moving the upper and lower molds together to crush them to the middle height position, or fixing one mold and moving the other mold and deck plate. Both of them can be crushed to an intermediate height position.
The length L ₂ of the plateau 5b of the upper surface side of Harino portion 5, may be minimal length required for a press working for closing the end, if example embodiment, the order of 10~30mm This is practical when the end is closed by pressing.

In the case of an intermediate enclosure type deck plate, when the bridge plate is spanned between the beams, the lower inclined surface adjacent to the beam mounting portion does not hit the beam. Take the length L ₁ (L ₁ ′) of the flat area on the lower surface slightly longer. Therefore, when the deck plate is spanned between the beams, an offset (m in FIG. 1 (b) or m ′ in FIG. 8 (d)) occurs in which a part of the beam placing portion is detached from the beam.
Deck plate 1 of the present invention, plateau 5b of the upper surface to the lower surface of the plateau 5a is rather short deck plate length direction and the inclined surface of the upper toward the mountain face from the top plateau, the beam top surface It is formed to extend from the position to the center side in the deck plate length direction from the edge of the upper surface of the beam, and the position of the upper edge of the upper inclined surface is in the deck plate length direction from the back end position A of the lower flat surface since the central side, the upper inner end position of the lower surface plateau 5a of Harino part 5 (FIG. 1 (b), a position of FIG. 6) is, on the way to the mountain face from the upper surface plateaus 5b The inclined surface 5d. That is, the cross section near the back end of the lower flat region 5a is a cross sectional shape having a certain height h. Therefore, the cross-sectional shape of the offset portion m that is disengaged from the flange of the beam 9 of the beam placing portion 5 when spanned between the beams is a conventional flat portion where the entire beam placing portion is flat and has a height corresponding to the flat portion thickness. Unlike the intermediate enclosure type deck plate, it has a constant height h and a large section modulus (having high section performance).
As shown in FIG. 6, when an evenly distributed load W _DL (FIG. 6 (c)) is applied to the deck plate 1 (10 </ b> D), stress is applied using the beam core as a fulcrum. When the deck plate 1 (10D) is joined to the beam 9 by welding or the like, the deck plate and the beam are integrated with each other, and the actual state has a distribution close to this idea. Accordingly, a bending moment M as shown in FIG. 6 (d) and a shearing force Q as shown in FIG. 6 (e) are applied. As can be seen from FIGS. 6 (d) and 6 (e), The bending moment M and the shearing force Q also act on the offset portion m (m ′) that is off the beam 9.
Since the section modulus of the offset portion m of the beam mounting portion 5 of the deck plate 1 of the present invention is sufficiently larger than the section modulus of the offset portion m ′ of the beam mounting portion 15 of the conventional deck plate 10D as described above, It can sufficiently withstand the shearing force and bending moment acting on m. That is, according to the present invention, the problem of insufficient rigidity of the offset portion of the beam mounting portion with respect to the shearing force and bending moment due to the load of the cast concrete at the time of construction can be obtained without impairing the workability and economical efficiency. That is, it can be easily avoided without reducing the length margin of the beam placing portion or increasing the rigidity of the deck plate itself.

For example, Table 1 shows a comparison of the cross-sectional performance at the offset portion m (m ′) of the deck plate 1 of the present invention and the conventional deck plate 10D. The compared deck plates 1 and 10D have the cross-sectional shape shown in FIG. 2, and the sizes thereof are as follows: mountain height = 120 mm, plate thickness = 1.0 mm, intermediate enclosure position = 75 mm (from the mountain surface), lower flat region 5a. (15a) length L ₁ (L ₁ ′) = 120 mm, inclination angle θ _U , _L = tan ⁻¹ 1/3. In addition, the length of the upper surface flat area 5b of the deck plate 1 of the embodiment of the present invention was calculated as zero. The calculated cross-sectional position is the rear end position (position A in FIG. 6) of the lower flat surface 5a (15a) of the beam placing portion 5 (15).
As Table 1, with respect to the section modulus 172.9Mm ³ of the conventional deck plate 10D, the section modulus of the deck plate 1 of the present invention embodiment is 48,800Mm ^3, has improved significantly sectional performance.

Although there is no clear basis for determining the tilt angle θ (an angle corresponding to θ _L or θ _U ) of the mold that performs enclosure processing (referred to as end closing processing by a press), the tilt angle θ is reduced. This means that the inclined surfaces 5c and 5d are lengthened. Therefore, the wide range is unnecessarily crushed and the mold is enlarged, so that it is not preferable that the inclination angle θ is too small.
In addition, the mold inclination angle θ is determined empirically by the quality state (surface properties, cracks, galling, slip scratches, etc.) of the base plate when enchrome processing is performed. It depends on the amount of elongation / compression strain of each part, and the amount of elongation / compression strain varies depending on what encro shape is used (how much the inclination angle θ is made). Since the elongation at break of the steel material is about 30%, the restriction of the elongation is the restriction of the inclined surface length / the flat region length ≦ 1.3, and the restriction of the inclination angle θ is θ ≦ 40 °. If the elongation at break is 20% in consideration of deformation, the limit of the inclination angle θ is θ ≦ 33 °.
When the inclination angle θ of the mold is increased, slipping between the base plate and the mold is likely to occur, and slip damage is likely to occur.
Therefore, it is appropriate to set the inclination angle θ to an angle at which no slip occurs between the base plate and the mold when enchrome processing is performed. Such an inclination angle θ will be described below.
When the product is crushed by the upper mold and the lower mold, a force as shown in FIG. 5 acts on the base plate. The pressing force P can be broken down into a sliding force S acting in the direction of the slope and an enclosing force Q. The portions to be encropressed are the sliding force S = P · sin θ and the encroaching force Q = P · cos θ acting in the direction of the slope from the “relationship of forces acting on the slope”. Assuming that the static friction coefficient of the slope is μ, from the relationship of S = μ · Q, μ · P · cos θ = P · sin θ, so μ = tan θ, and the static friction coefficient between the base plate and the mold is the slope angle of the slope It is determined by θ. Therefore, as the angle increases, the sliding force S increases, and the enchrome processing force Q decreases.
It is assumed that a certain pressing force P works when enchrome processing is performed. As the mold inclination angle θ is increased, the engraving force Q decreases and the force S for sliding on the slope increases. This means the following. Assuming that the pressing force P is constant, as the inclination angle θ is increased, the engraving force Q is reduced by the force S that tends to slide the slope. The engraving force Q is weakened and a satisfactory shape cannot be obtained. Therefore, when the press force P is further increased to increase the encroaching force Q, the force S acting along the slope increases, causing slipping and generating slip scratches on the base plate.
Thus, when the inclination angle θ of the mold is increased, the base plate and the mold slip, and the scratch surface enters the engraved surface, which is not preferable in terms of quality. Furthermore, the effect of S causes a crack in the encro shape.
In order to eliminate such quality troubles, it is necessary to eliminate slip. The maximum non-slip angle is the angle immediately before the base plate slides out of the mold.
In other words, the inclination angle θ determined by μ ≦ tan θ may be set.
Since the coefficient of static friction between the steel plate and the tool steel is generally 0.2 to 0.4, if the middle is selected and the coefficient of static friction between the base plate and the mold is μ = 0.33 = 1/3,
θ = tan ⁻¹ 1/3 = 18.4 °.
In this way, the inclination angle of the mold can be determined by the value of the coefficient of static friction μ between the base plate and the mold.
The mold tilt angle θ was tested for enchrome processing at various tilt angles θ using θ = tan ⁻¹ 1/3 = 18.4 ° as a guideline, but 1/4 ≦ tan ⁻¹ θ ≦ In the range of 1/2 (θ = 12.5 ° to 30 °), it was smoothly crushed and enchromeed without slip damage. Therefore, it is appropriate that the inclination angle θ of the mold is 12.5 ° to 30 °. That is, the upward inclination angle θ _U from the upper surface flat area 5b to the mountain surface and the downward inclination angle θ _L from the lower surface flat area 5a to the valley surface are both 12.5 ° to 30 °. ° (θ = tan ⁻¹ 1/4 to 1/2) is appropriate. However, it is not limited to the range.
The upper limit of the inclination angle θ is about 30 °, but if it is set in the vicinity thereof, the mold can be made as small as possible while preventing the occurrence of slip scratches.

In addition, although the size of the deck plate of the present invention is not particularly limited, for example, it is suitable for a deck plate having a high peak height for a long span. Specific product sizes include a peak height H = 80 to 160 mm, a plate thickness = 1.0 to 1.6 mm, middle enchrome position = 30 mm to 100 mm (from above), bottom flat area length L ₁ = 50 to 150 mm, inclination angle θ is tan ⁻¹ θ _{U, L} = 1/4 to 1 It is suitable for application to / 2 deck plates. The peak height H80 to 160 mm of the deck plate 1 is higher than the peak height 50 to 75 mm of a typical deck plate currently being implemented and has high rigidity, and is therefore suitable as a deck plate for a long span.

  In the above-mentioned embodiment, the case where the deck plate is applied to the deck plate for the composite floor slab having the step portion on the slope and the load being a load integrated with the concrete is described. It can also be applied to a deck plate used as a formwork. The deck plate that is the subject of the present invention may be basically a deck plate in which the horizontal crest surface 2 and the trough surface 3 are continuously formed on the inclined surface 4 to form a trapezoidal corrugated cross section as shown in FIG.

(A) is a side view showing the deck plate according to one embodiment of the present invention in a state of being spanned between beams, (B) is an enlarged view of the vicinity of the end of (A). FIG. 2 is an enlarged AA cut end view (however, thickness is omitted) of FIG. It is the BB arrow directional view (however, a beam is not shown) of FIG. It is a perspective view of the deck plate edge part vicinity in FIG. It is a figure for demonstrating inclination | tilt angle (theta) of the metal mold | die which encloses the said deck plate, and is typical sectional drawing of a metal mold | die. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the effect | action of the deck plate of this invention, (A) is the intermediate enclosure type deck plate 1 of this invention, (B) is the conventional intermediate enclosure type deck plate 10D, (C) is the deck plate. Uniform load W _DL acting on, (d) is a bending moment diagram (M diagram) at that time, and (e) is a shear force diagram (Q diagram). It is sectional drawing of a common deck plate. This is a general description of Enclo type deck plates. (A) is a deck plate that is not closed, (B) is a normal Encro type deck plate, (C) is a reverse Enclo type deck plate, (D) is an intermediate enclosure type deck plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deck plate 2 Mountain surface 3 Valley surface 4 Slope 5 Beam mounting part 5a Flat area on the lower surface 5b Flat area on the upper surface
5c Lower inclined surface from bottom flat area toward valley surface
5d Upper inclined surface 6, 7 engaging portion 9 beam m, m ′ offset portion L ₁ , L ₁ ′ from upper flat region toward mountain surface The length L ₂ , L ₂ ′ in the deck plate length direction of the bottom flat area of the beam mounting portion Length of deck plate length direction of upper surface flat area of beam mounting part _L Downward inclination angle from lower surface flat area of beam mounting part toward valley surface θ From upper surface flat area of _U beam mounting part to mountain surface Upward tilt angle toward
A Back end position A of the bottom flat area of the beam placement section

Claims (4)

In the deck plate used across the beams of the building, where the horizontal mountain surface and the valley surface continuously form a trapezoidal corrugated cross section on the slope,
The entire deck plate width direction at the end of the deck plate length direction is crushed to form an end-closed beam mounting portion at an intermediate height position between the peak surface and the valley surface, and the beam mounting portion is , the underside of which deck plate length direction L ₂ of the plateau of the upper surface relative to the deck plate longitudinal length L ₁ of the plateau is shorter, the inclined surface of the upper toward the mountain face from the upper surface plateaus Is formed to extend from the position of the upper surface of the beam to the center side in the deck plate length direction from the edge of the upper surface of the beam, and the position of the upper edge of the upper inclined surface is greater than the rear end position A of the lower flat surface area. A deck plate characterized by being on the center side of the deck plate length direction . Deck plate as claimed in claim 1, wherein the deck plate longitudinal length L ₂ of the plateau top surface side of the beam mounting unit is characterized in that it is a 10 to 30 mm. The upward inclination angle θ _U toward the mountain surface from the upper flat area of the beam mounting portion is tan ⁻¹ θ _U = 1/4 to 1/2, and the lower surface flat area of the beam mounting portion is directed to the valley surface. 3. The deck plate according to claim 1, wherein the downward inclination angle [theta] _L is tan < ^-1 > [theta] _L = 1/4 to 1/2. The deck plate according to any one of claims 1 to 3, wherein the deck plate is applied to a deck plate having a peak height of 80 to 160 mm.

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