JP2759580B2 - Synthetic floorboard construction method and deck plate for synthetic floorboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

In this invention, a deck plate passed between beams functions as a formwork when placing concrete.
The present invention relates to a composite floorboard construction method for constructing a composite floorboard having a structure in which a deck plate becomes integral with concrete and bears an applied load after concrete is hardened, and a deck plate for a composite floorboard used for the composite floorboard.

[0002]

2. Description of the Related Art A composite floor plate is a floor plate having a structure in which a deck plate passed between beams functions as a formwork when concrete is poured, and the deck plate becomes integral with concrete and bears an applied load after concrete hardens. Since the deck plate has an advantage that the concrete thickness can be reduced by bearing the applied load, it has been widely used in recent years.

[0003] This synthetic floorboard is recognized as having a fireproof structure without a fireproof coating under certain conditions (uncoated fireproof structure), and is excellent in workability. Fire-resistant composite floorboards are designed for fire resistance.
The condition is that the continuous support method (supporting method of continuous beam type) that supports with small beams etc. over 2 spans or more, and the simple supporting method of 1 span (supporting method of both ends supporting beam type) is insufficient for composite floor panel. Had not been realized. In addition, the length of one span of the conventional composite floorboard is also equal to 2.
It is about 0 m to 3.5 m, and a long span such as a span of 4 m or more has not been put to practical use. The continuous support method is more advantageous than the simple support method in terms of strength due to the effect of the negative bending moment at the intermediate fulcrum (the bending moment in the direction of bending the beam upward) (that is, for the same load). Less deflection).

FIGS. 5 and 6 show a conventional composite floorboard having an uncoated 2-hour fire-resistant structure. As shown in FIG. 5, the cross-sectional shape of the synthetic floorboard deck plate 1 used in this synthetic floorboard is such that a substantially trapezoidal peak A and a substantially inverted trapezoidal valley B share a hypotenuse. The horizontal top surface 2, the inclined web 3, and the horizontal bottom surface 4 are formed so as to be alternately formed, and adjacent ones are engaged with the edges of the bottom surfaces 4 at both right and left ends. The inclined web 3 having engagement portions 5 and 6;
Has a bent stepped portion 7 and a key groove-shaped convex portion 8 on the bottom surface portion 4. At the time of constructing the composite floorboard, the composite floorboard deck plate 1 is placed on the H-shaped steel beam 11 over two spans as shown in FIG.
And concrete 13 is poured.

In order to prevent concrete from leaking from the longitudinal ends of the deck plate during concrete casting, both ends in the longitudinal direction of the deck plate 1 are piled up as shown in FIG. Plate (which is referred to as an encro (end-closed) deck plate) in which the top surface 2 of the portion is crushed so as to come to the bottom portion 4 side of the valley to form a substantially flat steel beam mounting portion 15 is used. ing. Also, in order to reduce the floor height of the building, as shown in FIG. 8, both ends of the deck plate 1 are crushed in reverse so that the bottom 4 of the valley comes to the side of the top 2 of the hill. An almost flat steel beam mounting portion 16 is also formed (this structure is called a reverse enclosure). It is known that this inverted encro structure is effective in improving the strength as a composite floorboard because the inclined surface portion 18 restrains the lengthwise displacement between the deck plate 1 and the concrete 13. That is, FIG.
As shown in (a), in the case of a composite floorboard that has not been subjected to reverse enclosing, when deflection occurs due to a load, a longitudinal deviation δ occurs between the deck plate 1 and the concrete 13, and the concrete is not reinforced. Cracks occur and the composite effect is impaired. However, when both ends are reversely encroached as shown in FIG. 9 (b), the longitudinal displacement between the deck plate 1 and the concrete 13 is constrained by the inclined surfaces 18 formed by the reverse enclosed structures at both ends, and the combined effect is obtained. Can be secured. However, the conventional composite floorboard of the uncoated 2-hour fire-resistant structure has a continuous support of two or more spans and does not employ a reverse enclosing structure at both ends due to the existence of an intermediate fulcrum.

In FIGS. 7 and 8, reference numeral 17 denotes a stud with a head vertically welded and fixed to the upper surface of the beam 11 in order to secure the effect of the composite beam by connecting the composite floor plate and the beam 11. The whole of the headed stud 17 is embedded in concrete to secure the connection between the composite floorboard and the beam 11.

[0007]

When the workability of the composite floorboard is taken into consideration, it is desirable that the composite floorboard has a long span because long beams can save small beams and reduce man-hours. In addition, the uncoated fire-resistant structure is one of the major features of the composite floorboard. Therefore, the realization of a composite floor slab that satisfies uncoated fire resistance and has a long span is desired. Floorboards had not been realized.

Further, in the case of the deck plate 1 having the reverse enclosing structure shown in FIG. 8, there is an advantage that the height of the building can be reduced, but the concrete thickness S on the deck plate 1 is reduced to reduce the floor's own weight. When the thickness of the concrete on the beam 11 is set to be as thin as possible within the allowable range, the required thickness of the concrete on the beam 11 may be insufficient, and the beam 11 and the floor are integrally connected via the headed stud 17 as a composite beam. Performance could not be ensured in some cases.

The present invention has been made in view of the above background, and efficiently realizes a high yield strength as a composite floor panel, satisfies a long span and uncoated fire-resistant structure, has good workability, and has a floor structure. It is an object of the present invention to provide a composite floorboard capable of saving money and securing the effect of a composite beam, and a deck plate for a composite floorboard used for constructing the composite floorboard.

According to the present invention for solving the above problems, the structure of the deck plate for a synthetic floorboard used is such that substantially trapezoidal peaks and substantially inverted trapezoidal valleys are alternately formed sharing a hypotenuse. The horizontal top surface, the inclined web, and the horizontal bottom surface are continuous with each other, and at the edges of the top surfaces at the left and right ends, an engaging portion having a shape in which adjacent ones engage with each other is provided. Or one or both of the inclined webs are provided with lateral projections that can restrain the concrete in the cast valleys in the vertical direction, and crush each end from above and below at both ends in the longitudinal direction of the deck plate. A substantially flat steel beam mounting portion formed at an intermediate height between the top surface and the bottom surface, and further having a width b at the height of the top surface of the valley and a width of the top surface. The ratio to the width c is smaller than 0.6 (b / c
<0.6), and the ratio of the width b to the valley depth h is smaller than 1 (b / h <1), and the valley depth h is larger than 100 mm (h> 100 mm). The both ends of the deck plate for a synthetic floor plate are bridged between beams of one span, a welding wire mesh is disposed above the deck plate for a composite floor plate bridged between the beams, and the height of the beam upper surface in the valley portion of the deck plate. It is characterized by placing a reinforcing bar extending in the longitudinal direction of the deck plate at a position lower than the position and pouring concrete. The cross-sectional shape of the deck plate itself is a shape that restrains the concrete vertically, but when a load is applied to the composite floorboard, the deck plate restrains the concrete vertically and longitudinally. In other words, when a load is applied to the composite floorboard, a force that separates vertically between the deck plate and the concrete and a force that shifts in the longitudinal direction act on the composite floorboard. The restraint also restrains longitudinal displacement due to differences in adhesion and flexural rigidity between the deck plate and concrete. In addition, as for the above-mentioned intermediate height position forming the flat steel beam mounting portion, a height position of 1/3 to 1/4 from the top with respect to the length of the deck plate is appropriate.

[0011] A second aspect of the present invention is a composite floorboard deck plate used in the composite floorboard construction method of the first aspect, wherein the substantially trapezoidal ridge and the substantially inverted trapezoidal valley share a hypotenuse. The horizontal top surface, the inclined web, and the horizontal bottom surface are continuous so that they are formed alternately. And one or both of the bottom surface and the inclined web are provided with lateral projections capable of vertically restraining the concrete of the cast valley, and each end is provided at both ends in the longitudinal direction of the deck plate. A substantially flat steel beam mounting portion formed at an intermediate height between the top portion and the bottom portion, formed by crushing the valley from above and below, and further, the width of the valley at the top surface height position b is smaller than 0.6 (b / c <0.6) And the width b and smaller than the ratio of 1 between the depth h of the valley (b / h <1), and valley depth h is 1
It is characterized by being larger than 00 mm (h> 100 mm).

[0012]

The composite floor slab constructed by the above-mentioned composite floor slab construction method has a reinforcing bar extending in the length direction of the deck plate in the valley, so that the reinforcing bar improves the proof stress at room temperature and also has a fireproof structure during heating. Functions as reinforcement. In addition, since a flat steel frame mounting part is formed at the mid-height position of the deck plate using a single-span simple support method (this is called an intermediate enclosing structure), this intermediate enclosing structure is a reverse enclosing structure. Similarly, it effectively acts to restrain the gap between the deck plate and the concrete, and improves the strength as a composite floor plate. Accordingly, it is possible to obtain a synthetic floorboard having a long span of, for example, 4 m or more and an uncoated fireproof structure.

Further, since the steel beam mounting portion has an intermediate enclosing structure, which is a type of reverse enclosing structure, the top portion can be made lower than when the bottom portion is simply mounted on the beam. Floor height can be reduced. On the other hand, since it is not a simple reverse-enclosure structure but an intermediate-enclosure structure, and the top surface is located above the top surface of the beam, the concrete thickness on the beam can be sufficiently large even if the concrete thickness on the top surface is reduced. It is possible to secure the effect of the composite beam by the stud with the head vertically fixed on the beam by welding.

[0014] The deck plate for composite floorboard of claim 2 is
Suitable for use in the above synthetic floorboard construction method. In particular, since the engaging portions for connecting the deck plates are provided on the top surfaces at both left and right ends, it is suitable for forming an intermediate enclosing structure.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a composite floorboard construction method according to an embodiment of the present invention; FIG. FIG. 1 is a cross-sectional view of a composite floorboard according to the method of the present invention, and FIG. 2 is a vertical cross-sectional view. Further, FIG. 3 shows details of the cross-sectional shape of the deck plate for composite floorboard in the composite floorboard of FIG.
Shown in The composite floorboard deck plate 21 has a horizontal top surface 22 and an inclined web 23 such that a substantially trapezoidal peak A and a substantially inverted trapezoidal valley B are alternately formed sharing a hypotenuse. The bottom surface 24 is continuous with the horizontal bottom surface 24. At the edges of the top surface 22 at the left and right ends, there are provided engaging portions 25 and 26 in a shape in which adjacent ones engage with each other. It has a cross-sectional shape having a portion 27 and a key groove-shaped convex portion 28 at the center of the bottom surface portion 24. The bending step 27
Alternatively, the lateral protrusions 27a, 28a for vertically restraining the concrete in the valleys that have been cast by the key grooves 28.
(Which is a part of the bent step portion 27 or the key groove 28). In addition, a V-groove-shaped rib 29 extending in the longitudinal direction of the deck plate is formed on the top surface portion 22 in order to increase the rigidity of the top surface portion 22.

At both ends of the deck plate 21 for composite floorboard, each end is crushed from above and below to form a substantially flat steel beam mounting portion 30 at an intermediate height of the height of the deck plate. The structure in which the flat steel beam mounting portion is formed at the intermediate height position of the deck plate in this manner is called an intermediate encro structure. This intermediate enclosing structure has a steel beam
Since 0 is above the bottom portion 24, at that point it is a kind of reverse encro structure.

The deck plate 21 for composite floorboards
4 (a) and 4 (b), the sheet thickness t = 1.0 mm or 1.2 mm, and the working width a
= 600 mm, width b = 10 at the height of the top surface of the valley B
0 mm, width c = 200 mm of central top surface portion 22, width d = 80 mm of bottom surface portion 24, depth h of valley portion B = 125 mm or 150 mm or 175 mm, height position of bent step portion 27 from top surface portion 22 i = 40 mm (h = 125 mm), height j = 30 mm from the top surface at the position of the steel beam mounting portion 30 which is the intermediate encro structure, length g of the steel beam mounting portion 30 = 80 mm, etc. is there. The widths e and f of the left and right top surfaces 22 are set so that e + f = c (= 200 mm), but the left and right are made unequal and the rigidity of the top surface 22 at the connection position of the engagement portions 25 and 26 does not become insufficient. It is good to do so. As described above, the deck plate 21 for composite floorboard
The width of the top surface 22 is wide, and the width of the valley is narrow and deep.

When the composite floorboard is constructed, as shown in FIG. 2, the composite floorboard deck plate 21 is bridged between the beams 31 of one span by a simple support method. That is, the steel beam mounting portions 30 at both ends of the composite floor deck plate 21 are mounted on the beams 31. Then, a welding wire mesh 32 is arranged on the entire surface of the deck plate 21, and a reinforcing bar 33 extending in the longitudinal direction of the deck plate is arranged as a fire-resistant reinforcing bar in the valley B, and concrete 34 is cast.

In the composite floorboard constructed by the above-described method, the reinforcing bar 33 extending in the longitudinal direction of the deck plate is arranged in the valley B of the deck plate 21, so that the reinforcing bar 33 improves the proof stress at room temperature, and It functions as a refractory reinforcement when heated. In addition, since it is a one-span simple support system and has an intermediate enclosing structure in which a flat steel beam mounting portion 30 is formed at an intermediate height position of the height of the deck plate 21,
As in the operation of the reverse encro structure described with reference to FIG.
The effect of restraining the longitudinal displacement between the deck plate 21 and the concrete 34 is effectively exerted, and the strength as a composite floorboard is improved. As a result, it has become possible to obtain a synthetic floorboard having a long span of, for example, 4 m or more and an uncoated fireproof structure. Further, since the width c of the top surface portion 22 is large, the width b of the valley portion is small, and the depth h is large, the amount of concrete in the valley portion can be reduced and the floor's own weight can be reduced. In this case, since the valley portion is deep and the reinforcing bar 33 is present in the valley portion, the deck plate 21 and the reinforcing bar 33 can bear a large bending stress (tensile force) and can be combined without increasing the concrete thickness. It is possible to improve the strength of the floorboard.

Further, the steel beam mounting portion 30 is an intermediate enclosing, which is a kind of reverse enclosing, and the bottom portion 24 is simply attached to the beam 31.
Since the top surface 22 can be made lower than when it is placed on the floor, the floor height of the building can be reduced. On the other hand, an intermediate enclosures rather than merely reversed enclosures, since top wall 22 is positioned above the upper surface of the beam 31, be thinned concrete thickness S ₁ on the top wall 22, the concrete thickness of the beam 31 S ₂ Can be made thick enough and the beam 31
The effect of the composite beam by the stud 37 with the head vertically welded and fixed can be secured. Note that the height j of the steel beam mounting portion 30 from the top surface 22 is appropriately 1/3 to 1/4 of the length h of the deck plate 21. That is,
When the height j is too large, a longitudinal displacement insufficient force for restraining the a and height j is too small, binding thinner concrete thickness S ₂ on the beam beam between the deck plate and concrete Therefore, j = 1 / 3h to 1 / 4h is appropriate as described above because the effect of (1) may be impaired.

The construction method of the present invention is not limited to a steel-framed building, but is also applicable to a reinforced concrete building. In the case of a reinforced concrete structure, it is recommended that the reinforced concrete beam and the composite floorboard be simultaneously cast into concrete and constructed integrally.

[0022]

According to the present invention, the sectional shape of the deck plate in which the width b of the valley is sufficiently smaller than the width c of the top surface and the depth h of the valley is sufficiently large, and the upper surface of the beam in the valley is provided. Existence of reinforcing bars extending in the length direction of the deck plate located below the height position as fireproof reinforcement, adopting a one-span simple support system and adopting an intermediate enclosing structure, which is a kind of reverse enclosing structure, as a steel beam mounting part. The structure that restrains the gap between the deck plate and the concrete by this can improve the fire resistance,
For example, it has become possible to obtain a synthetic floorboard having a long span of 4 m or more and a fireproof structure between uncoated layers. This gives
Small beams can be saved, and the number of man-hours for construction has been reduced.

With the intermediate enclosing structure, the floor height of the building can be reduced, and the concrete thickness on the beam is sufficiently large even if the concrete thickness is reduced as much as possible within the allowable range in order to reduce the floor's own weight. It is possible to secure the effect of the composite beam by the stud with the head vertically fixed by welding on the beam.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a composite floorboard according to the composite floorboard construction method of the present invention.

FIG. 2 is a longitudinal sectional view of the composite floorboard of FIG.

FIG. 3 is an enlarged sectional view of a deck plate for a synthetic floorboard in the synthetic floorboard of FIG. 1;

FIG. 4 is a sectional view showing the dimensions of each part of the deck plate for composite floorboards.

FIG. 5 is a cross-sectional view of a conventional composite floor panel.

FIG. 6 is a longitudinal sectional view of a conventional composite floor panel.

FIG. 7 is a view illustrating an encro structure of a conventional deck plate for a synthetic floorboard.

FIG. 8 is a view for explaining a reverse-enclosure structure of a conventional deck plate for a synthetic floorboard.

FIG. 9 is a view for explaining the operation of the reverse encro structure when a load is applied to the composite floorboard having the reverse encro structure of FIG. 8;
FIG. 7A is an explanatory diagram for a case without a reverse-enclosure structure, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Deck plate for synthetic floorboards 22 Top surface part 23 Incline web 24 Bottom part 25, 26 Engagement part 27 Bent step part 27a, 28a Lateral protrusion part 28 Key groove-shaped convex part 29 Rib 30 Steel beam mounting part 31 Beam 32 Welded wire mesh 33 Rebar

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-173239 (JP, A) JP-A-62-225122 (JP, A) JP-A-52-26714 (JP, A) 130314 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04B 5/40

Claims (5)

(57) [Claims] The structure of a deck plate for a synthetic floorboard to be used is such that a substantially trapezoidal ridge and a substantially inverted trapezoidal valley are alternately formed so as to share an oblique side. An inclined web and a horizontal bottom surface are continuous with each other, and at an edge of a top surface portion at both left and right sides, an engaging portion having a shape in which adjacent ones engage with each other is provided. The top of the deck plate is formed by squeezing each end from the top and bottom at both ends in the longitudinal direction of the deck plate. A substantially flat steel beam mounting portion is formed at an intermediate height from the bottom surface, and the ratio of the width b at the height of the top surface to the width c of the top surface of the valley is zero. .6 (b / c <0.6) and the ratio of the width b to the depth h of the valley is 1 Small Ri (b / h is <1), and the depth h of the valley is larger than 100mm (h> 100mm),
Both ends of the composite floor deck plate are bridged between beams of one span, a welded wire mesh is placed above the composite floor deck plate bridged between the beams, and the height of the beam upper surface in the valley of the deck plate A method for constructing a composite floorboard, comprising placing a reinforcing bar extending in the longitudinal direction of a deck plate at a lower position and casting concrete. 2. A composite floorboard deck plate used in the composite floorboard construction method according to claim 1, wherein substantially trapezoidal ridges and substantially inverted trapezoidal valleys are alternately formed sharing a hypotenuse. A horizontal top surface portion, an inclined web and a horizontal bottom surface portion are connected to each other, and an engaging portion having a shape in which adjacent ones are engaged with each other at edges of the top surface portions at both right and left ends; Either one or both of the bottom and inclined webs are provided with lateral protrusions that can restrain the concrete in the cast valleys in the vertical direction. A substantially flat steel beam mounting portion formed by crushing and formed at an intermediate height between the top surface portion and the bottom surface portion; and a width b and a height at the top surface height position of the valley portion. The ratio to the width c of the surface portion is smaller than 0.6 (b / c
<0.6), and the ratio of the width b to the depth h of the valley is smaller than 1 (b / h <1), and the depth h of the valley is larger than 100 mm (h> 100 mm). A deck plate for a synthetic floorboard, characterized in that: 3. The deck plate for a synthetic floorboard according to claim 2, wherein the laterally projecting portion of the bottom portion of the valley is formed by a dovetail-shaped projecting portion projecting upward. 4. The composite floorboard according to claim 2, wherein the laterally projecting portion of the inclined web is formed by a bent step formed by bending an intermediate portion of the inclined web into a step shape. Deck plate. 5. The deck plate for a synthetic floorboard according to claim 2, wherein a V-shaped rib extending in the longitudinal direction of the deck plate is formed on the top surface.