JP2019011580A - Floor structure - Google Patents

Abstract

To provide a floor structure being lightweight and having improved handleability while maintaining flexural rigidity.SOLUTION: A floor structure 100 comprises: a main girder 150 extending in a first direction Y and connected to an upper plate 110 and a lower plate 120 within a hollow part surrounded by the upper plate 110, the lower plate 120, and a pair of side plates 130; and a plurality of horizontal girders 160 extending in a second direction X and intersecting with the main girder 150, and being connected to the lower plate 120 and the pair of side plates 130, and being arranged at prescribed intervals in the first direction Y within the hollow part. The side plates have a protruding part which protrudes downward at the central part in the first direction. The lower plate is curved downward along the protruding part. The weight per unit area of the floor structure 100 is set to be 20 kg/mor more and 50 kg/mor less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floor structure.

  For example, there exists a thing of patent document 1 as a floor slab which has predetermined rigidity. The floor slab of Patent Document 1 includes an upper plate and a lower plate made of metal, and a core portion formed of a lightweight material filled between the lower plate and the upper plate.

  For example, there is one described in Patent Document 2 as a floor slab applied to a railway platform. The floor slab of Patent Document 2 is formed of a high-strength concrete material. Therefore, in this floor slab, it is not necessary to arrange reinforcing bars or PC steel wires.

JP 2010-47936 A JP 2012-97554 A

  However, the floor slabs described in Patent Documents 1 and 2 are heavy and require heavy machinery for laying, transporting, etc., and are difficult to handle, making it difficult to shorten the construction time.

  An object of the present invention is to provide a floor structure that is lightweight and has improved handling properties while maintaining bending rigidity.

The floor structure of the present invention is a floor structure supported by a pair of supports spaced apart in a first direction, wherein the direction intersecting the first direction in plan view is the second direction, and the first direction And the direction crossing the second direction is the third direction, the plate is formed in a plate thickness direction along the third direction, extends in the first direction, and constitutes the top, A plate shape is formed along the third direction, the plate thickness direction extends along the first direction, extends in the first direction, opposes the upper plate in the third direction, and forms a bottom plate that forms the bottom. A pair of side plates that are arranged along the second direction in the plate thickness direction, extend in the first direction, connect the upper plate and the lower plate so as to face the second direction, and respectively constitute a pair of side portions; A main girder extending in the first direction and connected to the upper plate and the lower plate inside the hollow portion surrounded by the upper plate, the lower plate and the pair of side plates; Extending in the direction A plurality of horizontal beams that intersect with the main beam, are connected to the lower plate and the pair of side plates, and are arranged at predetermined intervals in the first direction, with respect to the length (L) of the upper plate in the first direction The slenderness ratio (W / L), which is the ratio of the length (W) of the upper plate in the second direction, is 1/10 or more and 1/1 or less, and the side plate bulges downward at the center in the first direction. The lower plate is curved downward along the bulging portion and has a weight per unit area of 20 kg / m ² or more and 50 kg / m ² or less as viewed from above.

This floor structure has a hollow portion surrounded by an upper plate, a lower plate, and a pair of side plates, and it is not necessary to fill the hollow portion with a concrete material, thereby reducing the weight. Moreover, since the floor structure includes a main girder extending in the first direction and connected to the upper plate and the lower plate, the floor structure has a predetermined bending rigidity. In addition, the floor structure is arranged so as to intersect the main girder and includes a plurality of horizontal girders connected to the lower plate and the pair of side plates, so that weight reduction is achieved while maintaining bending rigidity. be able to. The slenderness ratio (W / L), which is the ratio of the length (W) in the second direction to the length (L) in the first direction, is 1/10 or more and 1/1 or less, so the weight of the floor structure Necessary torsional rigidity can be ensured while suppressing an increase in. The floor structure has a weight of 20 kg / m ² or more and 50 kg / m ² or less because the weight per unit area is reduced, and an operator can lay, transport, etc. without using heavy equipment. The handling is improved.

  Further, the ratio (He / Hc) of the height (Hc) of the bulging portion to the height (He) of both end portions in the first direction of the side plate may be 1 or more and 3 or less. In the floor structure having this configuration, the required bending rigidity can be secured while suppressing an increase in weight.

  Moreover, the structure which has a 1st flange contact | abutted to the lower surface of an upper board, a 2nd flange contact | abutted to the upper surface of a lower board, and the web which connects a 1st flange and a 2nd flange may be sufficient as a main girder. In the floor structure having this configuration, the force acting on the upper plate and the lower plate can be suitably dispersed through the H-shaped main beam.

  In addition, the cross beam has a plate shape, the plate thickness direction is arranged along the third direction and extends in the second direction, and the cross beam forms the plate thickness direction along the first direction. And a pair of cross-girder side plates extending in the second direction and extending downward from both sides of the cross-girder upper plate in the first direction, forming a plate shape and the plate thickness direction being arranged along the third direction A configuration having a pair of cross beam flanges extending in the second direction, respectively connected to the pair of cross beam side plates, and in contact with the upper surface of the lower plate may be employed. In the floor structure having this configuration, the forces acting on the main girder, the lower plate, and the pair of lower plates can be suitably dispersed through the cross beam, and shear deformation can be suppressed.

  In addition, the upper plate, the lower plate, the pair of side plates, the main beam, and the cross beam may be integrally formed with a fiber reinforced resin including a woven fabric base made of continuous reinforcing fibers. As a result, it is possible to realize a floor structure that is excellent in weather resistance and corrosion resistance, is lightweight and has excellent handling properties while maintaining high bending rigidity.

  Moreover, 10% or more and 40% or less of the plate thickness of the upper plate may be made of a material including a continuous fiber base made of carbon fiber or glass fiber and continuous in one direction in the first direction.

  Further, 10% to 40% of the plate thickness of the lower plate may be made of a material including a continuous fiber base made of carbon fiber or glass fiber and continuous in one direction in the first direction.

  Moreover, the cylindrical part which forms an attachment hole is provided in the both ends of a 1st direction, an attachment hole penetrates in a 3rd direction from an upper board to a lower board, and a cylindrical part is formed in the upper board side. It is also possible to have a configuration including an enlarged diameter portion and a sheath tube portion connected to the enlarged diameter portion via a stepped portion and having an inner diameter smaller than the inner diameter of the enlarged diameter portion and formed on the lower plate side.

  Moreover, the structure for floors is arrange | positioned along with the 2nd direction, and the structure by which uneven | corrugated shape is formed in the outer surface of a side plate as a fitting part extended in a 1st direction may be sufficient.

Further, the floor structure of the present invention is a floor structure supported by a pair of supports spaced apart in the first direction, wherein the direction intersecting the first direction in plan view is the second direction, A direction intersecting the first direction and the second direction is a third direction, and a plate shape is formed, and a plate thickness direction is arranged along the third direction and extends in the first direction to form a top part; and A pair of main girders connected to the upper plate at both ends in the second direction and extending downward and extending in the first direction, and a pair of main girders extending in the second direction between the pair of main girders A plurality of cross beams connected to the lower side of the upper plate and arranged at predetermined intervals in the first direction, and in the second direction (W) of the upper plate with respect to the length (L) of the upper plate in the first direction The slenderness ratio (W / L) is 1/10 or more and 1/1 or less, and the pair of main girders has a bulging portion that bulges downward at the center in the first direction, Weight per unit area as viewed from is 20 kg / ^{m 2} or more 50 kg / ^{m 2} or less.

The floor structure does not need to be filled with a concrete material in a space surrounded by an upper plate, a lower plate, and a pair of side plates, and is reduced in weight. Moreover, since the floor structure includes a pair of main girders extending in the first direction and connected to the upper plate, the floor structure has a predetermined bending rigidity. Further, the floor structure is arranged so as to intersect the main girder and includes a plurality of horizontal beams connected to the pair of side plates, so that the rigidity in the second direction can be increased, and the main girder can be increased. And the shearing force which generate | occur | produces in a pair of opposing side plate can be relieved. The slenderness ratio (W / L), which is the ratio of the length (W) in the second direction to the length (L) in the first direction, is 1/10 or more and 1/1 or less, so the weight of the floor structure Necessary torsional rigidity can be ensured while suppressing an increase in. In addition, the floor structure has a weight increase of 20 kg / m ² or more and 50 kg / m ² or less because the weight of the unit area is increased, so that a worker can lay, transport, etc. without using heavy machinery. The handling is improved.

  According to the present invention, it is possible to provide a floor structure that is lightweight and has improved handling properties while maintaining bending rigidity.

It is a perspective view which shows the structure for floors concerning 1st Embodiment. It is a side view of the structure for floors shown in FIG. It is a side view which shows the edge part of the 1st direction of the side plate of the structure for floors shown in FIG. It is a partial notch perspective view which shows the internal structure of the structure for floors shown in FIG. It is the figure which looked at the structure for floors shown in Drawing 1 from the 1st direction. It is sectional drawing which looked at the center part of the structure for floors shown in FIG. 1 from the 1st direction. It is a perspective view which shows the cross | intersection part of the main girder and the cross beam arrange | positioned inside the structure for floors shown in FIG. It is sectional drawing orthogonal to the 2nd direction of the attachment hole of the structure for floors shown in FIG. It is a fragmentary sectional view which shows the attachment hole of the structure for floors shown in FIG. Transverses the width _(Y W), a diagram showing the height _(Y H), the arrangement interval _{(Y S).} It is a graph which shows the result of having made the hole of a different diameter in the FRP board and implementing the tensile test. Fig.12 (a) is sectional drawing orthogonal to the 1st direction of the structure for floors concerning the 1st modification. FIG. 12B is a cross-sectional view orthogonal to the first direction of the floor structure according to the second modification. Fig.13 (a) is sectional drawing orthogonal to the 2nd direction of the structure for floors concerning the 3rd modification. FIG. 13B is a cross-sectional view orthogonal to the second direction of the floor structure according to the fourth modification. FIG. 13C is a cross-sectional view orthogonal to the second direction of the floor structure according to the fifth modification. FIG. 14A is a cross-sectional view orthogonal to the first direction of the floor structure according to the sixth modification. FIG. 14B is a cross-sectional view orthogonal to the first direction of the floor structure according to the seventh modification. Fig.15 (a) is a side view which shows the edge part of the 1st direction of the structure for floors concerning the 8th modification. FIG. 15B is a side view showing the end portion in the first direction of the floor structure according to the ninth modification. FIG. 16A is a side view showing the floor structure according to the tenth modification. FIG. 16B is a side view showing the floor structure according to the eleventh modification. It is a perspective view which shows the edge part of the structure for floors concerning 2nd Embodiment. It is a perspective view which shows the structure for floors concerning 3rd Embodiment. It is sectional drawing which shows the attachment structure of the edge part of the 1st direction of the structure for floors concerning 4th Embodiment, and is sectional drawing orthogonal to a 2nd direction. It is sectional drawing which shows the attachment structure of the edge part of the 1st direction of the structure for floors concerning 5th Embodiment, and is sectional drawing orthogonal to a 2nd direction. It is sectional drawing which shows the attachment structure of the edge part of the 1st direction of the structure for floors concerning 6th Embodiment, and is sectional drawing orthogonal to a 2nd direction. It is sectional drawing which shows the state in the manufacturing process of the floor structure concerning Example 1, and is sectional drawing orthogonal to a 1st direction. It is a figure which shows a dynamic model.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted.

（δｃ：中央部のたわみ、（Ｅｌ）_０：曲げ剛性、ω：群集荷重、Ｌ：支持スパン） (Center deflection)
First, the center deflection (δc) of the floor structure having both ends supported with a uniform cross-sectional shape will be described. The central deflection (δc) of the floor structure having both ends supported in a uniform cross-sectional shape can be obtained by the following formula (1).

(Δc: deflection at the center, (El) ₀ : flexural rigidity, ω: crowd load, L: support span)

If the flexural rigidity (El) ₀ is increased, the deflection δc at the center portion decreases. The deflection δc increases exponentially as the support span L by the receiving girder, which is a substructure, increases to [3 m], [4 m], and [5 m]. Accordingly, the weight of the floor structure also increases. .

  According to the equation (1), as the support span L increases, in order to maintain the desired deflection δc, it is necessary to increase the height of the floor structure 100 and increase the bending rigidity.

  However, for example, in the case of a floor structure installed on a platform of a station, there is an event that the height of the floor structure cannot be increased unnecessarily. It is preferable that the upper surface of the floor structure 100 is a passenger walking zone and is flat. The height of the platform is determined by the height of the train entrance. The height of the receiving beam 190 is determined by the height of the shelter space provided at the lower part of the floor structure 100. When the natural frequency of the flexural vibration of the floor structure 100 is close to 2 [Hz], the amplitude of the flexural vibration becomes large, giving the pedestrian an uncomfortable feeling, and with respect to the floor structure 100 May have an undesirable effect.

The floor structure 100 preferably satisfies the following conditions (1) to (4).
(1) It is preferable to satisfy the conditions based on the guideline of “Technical Standard for Cross-Straight Facility / Description”.
(A) It is preferable that the deflection under a crowd load (5 [kN / m ² ]) as a live load is 1/500 or less of the support span L.
(B) It is preferable to avoid the natural frequency (2 [Hz]) of the flexural vibration of the floor structure 100.
(2) The weight of the floor structure 100 per projected area when viewed from above is set to 20 to 50 [kg / m ² ] to improve handling, and the floor structure 100 can be transported manually. It is preferable.
(3) It is preferable to withstand 2 million times of fatigue under a crowd load (5 [kN / m ² ]) which is a live load.
(4) It is preferable that the floor structure 100 has a structure that suppresses deformation due to torsion caused by an eccentric load on the track-side tip.

(First embodiment)
Next, the floor structure 100 of the first embodiment will be described. For convenience of explanation, three orthogonal directions are defined as a first direction Y, a second direction X, and a third direction Z. The first direction Y is the longitudinal direction of the floor structure 100 and is the direction in which the track extends. The second direction X is the width direction of the floor structure 100 and is a direction along the width direction of the track. The third direction Z is the height direction of the floor structure 100 and is the vertical direction.

  As shown in FIGS. 1 to 10, the floor structure 100 is formed in a hollow box shape. The floor structure 100 includes an upper plate 110, a lower plate 120, and a pair of side plates 130, and has a rectangular tube shape. The cross section perpendicular to the first direction Y of the floor structure 100 has a rectangular shape. The upper plate 110 forms the top of the floor structure 100, and the lower plate 120 forms the bottom of the 100. The plate thickness direction of the upper plate 110 and the plate thickness direction of the lower plate 120 are arranged along the third direction Z. The upper plate 110 and the lower plate 120 are disposed to face the third direction Z.

  The pair of side plates 130 form the side portion of the floor structure 100. The thickness direction of the pair of side plates 130 is arranged along the second direction X. The pair of side plates 130 are disposed to face the second direction X.

The slenderness ratio (W / L), which is the ratio between the length (W) in the second direction X of the floor structure 100 and the length (L) in the first direction Y, satisfies the following formula (2).
1/10 ≦ W / L ≦ 1/1 (2)

  The upper surface of the upper plate 110 is, for example, a flat surface. As shown in FIGS. 2 to 4, the lower plate 120 is formed so as to bulge downward (bulge portion). A central portion 121 of the lower plate 120 in the first direction Y is disposed below both end portions 122 of the lower plate 120. When viewed from the second direction X, the central portion 121 and both end portions 122 of the lower plate 120 are disposed, for example, in parallel with the first direction Y.

  The lower plate 120 has an inclined portion 170 that is inclined with respect to the central portion 121 and both end portions 122. When viewed from the second direction X, the inclined portion 170 is inclined with respect to the first direction Y (inclined with respect to the XY plane) between the central portion 121 and both end portions 122. The inclined portion 170 extends obliquely upward from the end portion of the central portion 121 in the first direction Y. The end portion 122 is bent from the upper end portion of the inclined portion 170 and extends along the first direction Y.

  The side plate 130 has a central part 131, an end part 132, and a widened part 133. The central portion 131 is a portion that is formed at the central portion in the first direction Y of the side plate 130 and corresponds to the central portion 121 of the lower plate 120. As shown in FIG. 3, the length Hc of the central portion 131 in the third direction Z is, for example, constant in the first direction Y. The end portions 132 are portions respectively formed at both end portions in the first direction Y of the side plate 130 and corresponding to the end portion 122 of the lower plate 120. The length He in the third direction Z of the end portion 132 is, for example, constant in the first direction Y. Further, the bulging portion of the side plate 130 is a portion that projects downward from the end portion 132.

  The widened portion 133 is a portion that is formed between the central portion 131 and the end portion 132 in the first direction Y of the side plate 130 and corresponds to the inclined portion 170 of the lower plate 120. The lower side of the widened portion 133 is inclined along the inclined portion 170. The widened portion 133 connects the central portion 131 and the end portion 132. And the center part 131 and the wide part 133 of the both sides have comprised the trapezoid shape which protrudes below.

  Further, the floor structure 100 includes a main beam 150 and a horizontal beam 160 as shown in FIGS. 1 and 4. The main beam 150 extends along the first direction Y, and the cross beam 160 extends along the second direction X and intersects the main beam 150. The floor structure 100 has a plurality of cross beams 160.

(Description of main girder 150)
As shown in FIGS. 4 to 7, the main girder 150 is disposed in the hollow portion of the floor structure 100. The cross section that intersects the first direction Y of the main beam 150 has, for example, an H shape. The main girder 150 includes a pair of flanges (first flange and second flange) 150a and a web 150b. The plate thickness direction of the flange 150a is arranged along the third direction Z, and the plate thickness direction of the web 150b is arranged along the second direction X. The main beam 150 is disposed in the center of the floor structure 100 in the second direction X.

  When viewed from the second direction X, the shape of the main beam 150 corresponds to the shape of the side plate 130. The shape of the web 150 b of the main girder 150 corresponds to the central portion 131, the end portion 132, and the widened portion 133. The upper flange 150a of the main beam 150 is in contact with the lower surface of the upper plate 110 over the entire length in the first direction Y. The lower flange 150 a of the main girder 150 is in contact with the upper surface of the lower plate 120 over the entire length in the first direction Y, and is in contact with the center portion 121, both end portions 122, and the pair of inclined portions 170.

  As shown in FIG. 7, the main girder 150 is provided with a penetrating portion that penetrates the cross beam 160. The web 150b is provided with a penetrating portion penetrating in the thickness direction. Further, the lower flange 150a is spaced apart in the first direction Y so as to form a penetrating portion. The shape of the penetrating portion of the main beam 150 corresponds to the shape of the horizontal beam 160.

(Description of horizontal beam 160)
The cross beam 160 has, for example, a hat shape in a cross section intersecting the second direction X. The cross girder 160 includes a top plate (horizontal girder upper plate) 161, a pair of side plates (lateral girder side plate) 162, and a pair of flanges (cross girder flange) 163. The top plate 161 constitutes the top of the cross beam 160. The plate thickness direction of the top plate 161 is arranged along the third direction Z.

  The pair of side plates 162 are disposed to face the first direction Y. The thickness direction of the pair of side plates 162 is arranged along the first direction Y. The pair of side plates 162 are formed so as to protrude downward from the end portions of the top plate 161 in the first direction Y.

  The pair of flanges 163 protrudes from the lower ends of the pair of side plates 162 to the outside in the first direction Y. The plate thickness direction of the pair of flanges 163 is arranged along the third direction Z. The lower surfaces of the pair of flanges 163 are in contact with the upper surface of the lower plate 120.

  In addition, notches 164 are provided at the lower ends of both ends of the pair of side plates 162 in the second direction X. The shape of the notch 164 is formed so as to form, for example, a rectangle when viewed from the first direction Y. Thereby, it has comprised so that the inside of the cross beam 160 may not become a sealing structure. Further, the length of the pair of flanges 163 in the second direction X is shorter than the length of the pair of side plates 162 in the second direction X. For example, the length of the flange 163 in the second direction X corresponds to the length between the pair of notch portions 164 that are separated in the second direction X.

  Further, as shown in FIG. 7, the lower plate 120 is formed with a drain hole 250 penetrating in the plate thickness direction. The drain holes 250 are arranged on both sides in the second direction X so as to sandwich the main beam 150. Further, the drain hole 250 is provided at a position covered with the top plate 161 of the cross beam 160 in the first direction Y.

  The inner diameter of the drain hole 250 is less than 10% of the length (W) of the lower plate 120 in the second direction X. However, the total diameter of holes to be drilled is less than 10% of the length (W) of the lower plate 120 in the second direction X. Thereby, even if the reinforcement around the drain hole 250 is eliminated, the strength reduction of the lower plate 120 can be suppressed. Further, in the floor structure 100, the water drain hole 250 is formed, so that water condensed in the floor structure 100 can be discharged to the outside of the floor structure 100.

(Installation structure of floor structure 100)
The floor structure 100 is installed, for example, at a height of 1 [m] from the ground. Thereby, a retreat space is formed below the floor structure 100. The floor structure 100 is not limited to be installed at a height of 1 [m] from the ground, and the installation height of the floor structure 100 may be 1 [m] or less. ] Or more. Further, a retreat space may be provided below the floor structure 100, or a retreat space may not be provided below the floor structure 100.

  The floor structure 100 is installed, for example, so as to project from the platform body to the track side. The floor structure 100 is stretched over a receiving girder (lower structure, receiving girder) 190 that protrudes from the platform body to the track side. The girder 190 is, for example, H-shaped steel, extends in the second direction X, and is disposed in the first direction Y at intervals of, for example, 3 [m] to 5 [m]. The floor structure 100 is supported and fixed to the upper flange 190a of the receiving beam 190.

(Mounting structure of floor structure 100)
As shown in FIGS. 8 and 9, the floor structure 100 includes attachment portions (tubular portions) 200 at both ends in the first direction Y. The attachment part 200 forms an attachment hole penetrating in the third direction Z. The attachment portion 200 includes a diameter-expanded portion 205 formed on the upper plate 110 side, and a sheath tube portion 210 communicating with the diameter-expanded portion 205.

  The enlarged diameter portion 205 has a cylindrical shape and is a portion in which the washer 240 and the nut 230 are accommodated. A stepped surface (stepped portion) is provided at the bottom of the enlarged diameter portion 205, and the stepped surface connects the inner peripheral surface of the enlarged diameter portion 205 and the inner peripheral surface of the sheath tube portion 210.

  The sheath tube portion 210 has a cylindrical shape whose inner diameter is smaller than that of the expanded diameter portion 205. The sheath tube portion 210 is formed on the lower plate 120 side. Then, the L bolt 220 is inserted from below, and the male threaded portion of the upper end portion of the L bolt 220 reaches the inside of the enlarged diameter portion 205. By tightening the nut 230 attached to the male thread portion, the washer 240 is pressed against the stepped surface at the bottom of the enlarged diameter portion 205.

  A bent portion on the lower side of the L bolt 220 extends in the first direction Y, and is in contact with the lower surface of the flange 190a on the upper side of the receiving beam 190. The flange 190 a is sandwiched from both sides in the third direction Z by lower bent portions of the lower plate 120 and the L bolts 220. Then, by tightening the nut 230, the floor structure 100 is fixed to the flange 190a.

  The fixing of the floor structure 100 to the lower structure is not limited to the form in which the floor structure 100 is fixed to the receiving girder 190 using the L bolts 220. The structure 100 may be fixed.

(Fiber reinforced resin)
The upper plate 110, the lower plate 120, the pair of side plates 130, the main beam 150, and the horizontal beam 160 of the floor structure 100 are integrally formed of fiber reinforced resin. The fiber reinforced resin includes a woven substrate made of at least continuous reinforcing fibers.

  The floor structure 100 formed of such a fiber reinforced resin can suppress the development of cracks caused by “salt damage” and “freezing / thawing”, so that the durability is improved and each plate-like structure is improved. The in-plane rigidity of the structural part can be increased. Thereby, bending rigidity can be ensured, aiming at weight reduction of the structure 100 for floors.

  Further, in the upper plate 110, the fiber volume content occupied by the continuous fiber substrate made of carbon fiber or glass fiber that is continuous in one direction in the first direction Y and laminated in the plate thickness direction is 10% or more and 40% or less. It is preferable that it is composed of 20% or less and 30% or less. Thereby, since the bending rigidity of the 1st direction Y of the upper board 110 can be improved, further weight reduction can be achieved.

  Similarly, in the lower plate 120, the fiber volume content occupied by the continuous fiber substrate made of carbon fiber or glass fiber that is continuous in one direction in the first direction Y and laminated in the plate thickness direction is 10% or more and 40%. Or less, more preferably 20% or less and 30% or less. Thereby, since the bending rigidity of the lower plate 120 in the first direction Y can be improved, further weight reduction can be achieved.

(Reinforcing fiber of fiber reinforced resin)
As the reinforcing fiber of the fiber reinforced resin, for example, glass fiber, aramid fiber, carbon fiber and the like can be used alone or in combination. By including the carbon fiber, the specific strength and the specific rigidity are improved, whereby the weight of the molded body can be further reduced.

In addition, as a form of a reinforced fiber, the base material which combined suitably the "short fiber and mat | matte whose fiber length is 1-3 mm", "the cloth which consists of continuous fibers", "strand" etc. suitably is illustrated.
The matrix resin for making the fiber reinforced resin is not particularly limited. For example, thermosetting resins such as epoxy resin, unsaturated polyester resin, vinyl ester resin, polyethylene, polypropylene, nylon, ABS (acrylonitrile butadiene) A thermoplastic resin such as styrene), PEEK (polyetheretherketone), or polyimide can be used.

(Fiber-reinforced resin molding method)
As a molding method for forming the fiber reinforced resin, a matrix resin can be used. Alternatively, as a molding method for forming the fiber reinforced resin, depending on the form of the reinforcing fiber, vacuum, blow, stamping, BMC (bulk molding compound), SMC (sheet molding compound), transfer molding, RTM (resin It can be easily formed using various methods such as transfer molding and hand lay-up molding.

  In addition to powders for increasing viscosity (for example, calcium carbonate and sand), layered compounds (for example, mica, molybdenum disulfide, boron nitride, etc.), acicular compounds (for example, zonotlite, titanium) Acid potassium, carbon fiber, etc.), granular, or sheet-like compounds (eg, ferrite, talc, clay, etc.) may be added. Thereby, conversion into the frictional heat by the mutual motion of inorganic crystals or an inorganic substance and a matrix is made. Filling the matrix resin with a filler (filler) increases the elastic modulus and density, increases resistance to vibration, and improves damping characteristics. By using such a floor structure 100 as a platform floor material, vibration is reduced.

(Additives added to the filler)
Further, for example, aluminum hydroxide, bromine, inorganic powder or the like may be added to the filler. Thereby, the flame retardance of the structure 100 for floors can be improved. As a result, a platform can be constructed with railway flame retardancy.

(About the weight per unit area of the floor structure 100)
The weight per unit area of the floor structure 100 is 20 kg / m ² or more and 50 kg / m ² or less. This unit area is a unit area when the floor structure 100 is viewed from above.

(Explains the deflection in the center)
The moment of the simple support beams at both ends as shown in FIG. 23 is expressed by the following formula (3).

The deflection equation is expressed by the following equation (4).

Under the condition of the following formula (5), the deflection angle and the sag at each part (the end part 410, the widened part 420, the central part 430) can be expressed as shown in Table 1 below.

  The points A and F are the end portions in the first direction Y in the floor structure 100. B point and E point are positions corresponding to the boundary between the end portion 132 and the widened portion 133 in the first direction Y. The points C and D are positions corresponding to the boundary between the widened portion 133 and the central portion 131 in the first direction Y.

Table 2 below shows boundary conditions at points A, B, C, and the center (the center between points A and F).

From this, when the integration constant of each point (point A, point B, point C, center) is obtained, it can be expressed as shown in Table 3 below.

Therefore, the following equation (12) is obtained by substituting the following equation (11) into the deflection equation between C and D for the center deflection.

（δｃ：中央部のたわみ、（Ｅｌ）_ｃ：曲げ剛性、ω：群集荷重、Ｌ：支持スパン） Therefore, when the deflection ratio δ with respect to the support span L is obtained, the following equation (13) is established.
The floor structure 100 satisfies the following formula (13).

(Δc: deflection at the center, (El) _c : bending rigidity, ω: crowd load, L: support span)

Integration constant _{C 6} in the formula (13), the above equation (10) into equation (8), by substituting each of the bending rigidity determines the constant _{C 3.} The following constants C3 into Equation (6), determine the constants _{C 1,} we obtain a _{C 4} by substituting the constants _{C 1} and a constant _{C 3} to Equation (7), the constant _{C 3,} the constant _{C 5,} constant C ₄ is determined by substituting into equation (9).

  Accordingly, the center deflection of the floor structure 100 is determined by the correlation of the bending rigidity ratios of the attachment portion (end portion 410), the inclined portion (widened portion 420), and the central portion 430.

(Length of the center of the side plate)
Next, the length (L ₁₂₁ ) in the first direction Y of the central portion 131 of the side plate 130 will be described with reference to FIG. The length (L ₁₂₁ ) of the central portion 131 preferably satisfies the following formula (14).
L ₁₂₁ = L-2K (14)

Here, “K” is the length of the end portion 132 of the side plate 130 in the first direction Y. The length (K) of the end portion 132 is the length of the portion outside the inclined portion 170 in the first direction Y, and is, for example, not less than 0.2 [m] and not more than 0.3 [m]. Above, the minimum length that can be supported and fixed to the receiving beam 190. When the length (K) of the end portion 132 is 0.3 [m] or more, it is necessary to increase the weight of the floor structure 100 in order to ensure the required allowable deflection. As described above, the mounting portion, the inclined portion, the correlation between the bending rigidity ratio of the central portion, because it affects the deflection, the inclined portion 170 is not included in the L _121.

(Dimension of the horizontal beam)
Next, an example of the dimensions of the cross beam 160 will be described with reference to FIG. The width (Y _W ) of the cross beam 160 is the length of the top plate 161 in the first direction Y. The width (Y _W ) of the cross beam 160 is preferably 1/3 or more and 1/2 or less with respect to the length (W) of the upper plate 110 of the floor structure 100 in the second direction X.

The arrangement interval (Y _S ) in the first direction Y of the cross beam 160 is preferably (n + 1) equal to the length L ₁₂₁ of the central portion 121 of the lower plate 120 in the first direction Y. Here, “n” is a natural number obtained by rounding up the decimal part of the length L ₁₂₁ of the central portion 121 in the first direction Y. For example, if L ₁₂₁ is 3.4 m, n = 4. Thus, by setting the arrangement interval (Y _S ) of the cross beams 160, it is possible to ensure the necessary cross-sectional performance against the torsional load while minimizing the increase in the weight of the floor structure 100.

In the cross-sectional configuration of the floor structure 100 when the cross beam 160 is not provided, the maximum value of the shear stress generated in the web 150b of the pair of side plates 130 and the main beam 150 due to the bending load is in the first direction Y. It is on the vertical axis N. When considering the weight reduction of the floor structure 100, the length (Y _H ) of the cross beam 160 in the third direction Z is ½ or more of the height (Y _N ) from the lower plate 120 to the neutral axis N. It is preferable that it is 1/1 or less. Accordingly, the floor structure 100 is obtained by the interaction between the fiber reinforcement at the contact portion between the cross beam 160 and the web 150b of the main beam 150 and the fiber reinforcement at the contact portion between the cross beam 160 and the pair of side plates 130. The acting shear stress can be relaxed.

Such a floor structure 100 has a hollow portion surrounded by the upper plate 110, the lower plate 120, and the pair of side plates 130, and it is not necessary to fill the hollow portion with a concrete material, thereby reducing the weight. Can do. Moreover, since the floor structure 100 includes the main girder 150 extending in the first direction Y and connected to the upper plate 110 and the lower plate 120, the floor structure 100 has a predetermined bending rigidity. Further, the floor structure 100 is arranged so as to intersect the main girder 150 and includes a plurality of cross beams 160 connected to the lower plate 120 and the pair of side plates 130, so that the bending rigidity is maintained. However, weight reduction can be achieved. The slenderness ratio (W / L), which is the ratio of the length (W) in the second direction to the length (L) in the first direction, is 1/10 or more and 1/1 or less, so the weight of the floor structure Necessary torsional rigidity can be ensured while suppressing an increase in. Further, the floor structure 100 has a weight per unit area of 20 [kg / m ² ] or more and 50 [kg / m ² ] or less, and thus can be reduced in weight without using heavy machinery. Workers can perform laying, transportation, and the like, and handling properties can be improved.

  Since the ratio (He / Hc) of the height (Hc) of the bulging portion to the height (He) of both end portions 132 in the first direction Y of the side plate 130 is 1 or more and 3 or less, while suppressing an increase in weight. The required bending rigidity can be secured.

  The main girder 150 is configured to include a flange 150a that contacts the lower surface of the upper plate 110, a flange 150a that contacts the upper surface of the lower plate 120, and a web 150b that connects the upper and lower flanges 150a. The force acting on the plate 110 and the lower plate 120 can be preferably dispersed through the H-shaped main beam 150.

  In addition, the upper plate 110, the lower plate 120, the pair of side plates 130, the main beam 150, and the cross beam 160 are integrally formed of a fiber reinforced resin including a woven base material made of continuous reinforcing fibers, so that weather resistance and corrosion resistance are improved. In addition, it is possible to realize a floor structure that is lightweight and has excellent handling properties while maintaining high bending rigidity.

(Effect of inclined portion 170)
In addition, since the floor structure 100 includes the inclined portion 170, by loosening the shape change, an abrupt change in the cross-sectional shape is prevented, and stress concentration in the corner portion (shape discontinuity portion) is alleviated. For example, if the structure has a right-angled corner, stress concentration at the corner increases, and the fiber base material may be peeled off, which may be the fracture base point.

  As shown in FIGS. 3 and 8, the inclined portion 170 of the lower plate 120 is inclined at an inclination angle θ with respect to the XY plane along the second direction X and the first direction Y. The inclination angle θ is preferably 30 degrees or more and 60 degrees or less, for example. Further, by increasing R of the corner portion which is the end portion of the inclined portion 170, the stress concentration can be reduced.

(Effect of opening 180)
In addition, the floor structure 100 is a hollow structure having openings 180 at both ends and continuing in the first direction Y. Therefore, signal lines and illumination power lines can be arranged. These signal lines and illumination power lines can be arranged along the first direction Y of the floor structure 100. This prevents the signal line and the illumination power line from being exposed to the outside, so that the landscape on the platform can be improved. The floor structure 100 may have a configuration in which the opening 180 is not formed.

(Effect of horizontal beam 160)
In addition, since the floor structure 100 is provided with a plurality of cross beams 160, deformation due to twisting can be suppressed while reducing weight.

  Further, in the floor structure 100, the main beam 150 and the cross beam 160 are connected to each other at right angles, and the cross beam 160 is connected to the pair of side plates 130. Deformation in which 130 swells outward in the second direction X can be suppressed. Further, even when a passenger gets on and off, even if a torsional force is generated at the track-side tip of the floor structure 100 due to an eccentric load on which the crowd load acts, the deformation of the pair of side plates 130 is suppressed. Specifically, deformation that is recessed in the second direction X is suppressed.

  Moreover, in the floor structure 100, since the notch 164 is provided in the cross beam 160, the inside of the cross beam 160 does not become a closed space. Therefore, for example, even if the air inside the cross beam 160 expands due to an increase in temperature, the deformation of the floor structure 100 is suppressed. Specifically, the downward swelling of the lower plate 120 is suppressed.

  Moreover, in the floor structure 100, since the drain hole 250 is provided in the lower plate 120, the dew condensation water generated inside the hollow structure can be discharged to the outside. Further, since the diameter of the drain hole 250 is 10% or less of the length (W) in the second direction X, the strength is reduced even when the hole around the drain hole 250 is not reinforced. Is suppressed.

  FIG. 11 is a graph showing the results of performing a tensile test by opening holes with different diameters in the FRP plate. The horizontal axis shows the ratio (d / w) of the hole diameter (d) [m] to the specimen width (w) [m], and the vertical axis shows the average strength [MPa] of the minimum cross section. From this result, it was found that if the ratio (d / w) is 0.1 [10%] or less, a decrease in the average strength of the minimum cross section can be suppressed.

Example 1
Next, the floor structure 100 according to the first embodiment will be described. As shown in FIGS. 1 and 2, in the floor structure 100 of the first embodiment, the length (L) in the first direction Y is 5 [m], and the width W is the length in the second direction X. 0.5 [m]. In the first embodiment, the length Le of the end portion 132 in the first direction Y is 0.2 [m], and the length He of the end portion 132 in the third direction Z is 0.15 [m].

In Example 1, the length L ₁₇₀ along the first direction Y of the inclined portion 170 was set to 0.1 [m]. In Example 1, the inclination angle θ with respect to the central portion 121 of the lower plate 120 of the inclined portion 170 was set to 45 degrees.

In the first embodiment, the length (L ₁₂₁ ) of the central portion 121 of the lower plate 120 in the first direction Y is 4.4 [m], and the length (Hc) of the central portion 131 of the side plate 130 in the third direction Z is set. Was 0.25 [m]. When the central portion 131 is viewed from the second direction X, it has an inverted trapezoidal shape that is convex downward.

(Manufacturing method of Example 1)
Next, a method for manufacturing the floor structure 100 of the first embodiment will be described. First, in a 1st process (step S1), the 1st shaping | molding die for shape | molding the upper board 110 is prepared. Specifically, a first molding die having a convex shape for molding the enlarged diameter portion 205 of the attachment portion 200 at both ends of the floor structure 100 is prepared. A flat surface for forming the upper surface of the upper plate 110 is formed in the first mold.

  Next, a second molding die 320 (see FIG. 22) for molding the lower plate 120 and the pair of side plates 130 is prepared. The cross-sectional shape that intersects the first direction Y of the second mold 320 is, for example, U-shaped, corresponding to the lower plate 120 and the pair of side plates 130. Further, when the second mold 320 is viewed from the second direction X, it corresponds to the shape of the side plate 130 and has an inverted trapezoidal shape with a central portion protruding downward.

  Next, a third mold for forming the main beam 150 is prepared. When the third mold is viewed from the second direction X, it corresponds to the shape of the main girder 150 and has an inverted trapezoidal shape with a central portion protruding downward. The third mold is a pair of male molds facing the second direction X when viewed from the first direction Y in order to integrally mold the flange 150a of the main beam 150 and the web.

  Next, the 4th shaping | molding die for shape | molding the cross beam 160 is prepared. The fourth mold is a convex male mold corresponding to the shape of the cross beam 160.

Next, in the second step (step S2), a release material was applied to the first mold, the second mold 320, the third mold, and the fourth mold. Thereafter, a gel coat of about 500 [g / m ² ] to 800 [g / m ² ] was applied to the first mold and the second mold 320.

  Here, for the description of the molding method, as shown in FIG. 22, the floor structure 100 is divided into an upper molded body 10, an inner molded body 20, and a lower molded body 30. The upper molded body 10 is an upper plate 110. The internal molded body 20 is a part to be installed, and has a main beam 150, a cross beam 160, and an L angle 140. The lower molded body 30 includes a lower plate 120 and a side plate 130.

  The reinforcing fiber base material used for the floor structure 100 includes a chopped strand mat, a glass roving cloth, and a carbon fiber unidirectional cloth.

A chopped strand mat (hereinafter referred to as a mat) is a sheet-like base material in which glass fibers are cut into a predetermined length and randomly dispersed. The mat used for the floor structure 100 is a mat MC300 (trade name, manufactured by Nittobo Co., Ltd.) having a fiber basis weight of 300 [g / m ² ] and a mat MC450 having a fiber basis weight of 450 [g / m ² ]. (Trade name, manufactured by Nittobo Co., Ltd.).

Glass roving cloth is a woven fabric using glass roving for warp and weft. The woven fabric used for the floor structure 100 is a plain woven fabric, and is a roving cloth WR800 (trade name, manufactured by Nittobo Co., Ltd.) having a fiber basis weight of 800 [g / m ² ].

The carbon fiber unidirectional cloth is a woven fabric in which carbon fibers are used for warp yarns (longitudinal orientation of the present structure) and glass fiber filaments are used as weft yarns to prevent loosening. The carbon fiber unidirectional cloth is a unidirectional cloth UT70-20G (trade name, manufactured by Toray Industries, Inc.) having a fiber basis weight of 200 [g / m ² ].

  The resin used for molding the floor structure 100 is an unsaturated polyester resin to which 30 parts of aluminum hydroxide is added in order to impart flame retardancy. (Hereafter referred to as “flame retardant resin”.)

  The resin used for joining the upper molded body 10, the inner molded body 20 and the lower molded body 30 is 10 parts of a filler which is a glass fiber cut to a length of 3 [mm] to the flame retardant resin, It is a putty-like resin to which 20 parts of talc is added as a thickener (hereinafter referred to as “joining resin”). In the method for forming the floor structure 100, a hand lay-up molding method was used.

Next, in the third step (step S3), the upper molded body 10 was molded. Here, the first layer to the fifth layer were sequentially laminated on the first mold while forming the enlarged diameter portions 205 at both ends in the first direction Y of the upper plate 110.
In the lamination of the first layer, the mat MC300 was laminated while impregnating the flame retardant resin.
In the lamination of the second layer, the roving cloth WR800 was laminated while impregnating the flame retardant resin.
In the lamination of the third layer, the mat MC300 was laminated while impregnating the flame retardant resin.
In the fourth layer, three unidirectional cross UT70-20G were laminated while impregnating the flame retardant resin.
In the lamination of the fifth layer, the mat MC300 was laminated while impregnating the flame retardant resin.

  After the fifth layer was laminated and the resin was cured, the mold was removed from the first mold to obtain the upper molded body 10.

Next, in the fourth step (step S4), the lower plate 120 and the side plate 130 of the lower molded body 30 were molded. Here, the 1st layer-the 3rd layer were laminated in order on the inner surface of the 2nd forming die 320 which is a female type which forms a U character.
In the lamination of the first layer, the mat MC300 was laminated while impregnating the flame retardant resin.
In the lamination of the second layer, the roving cloth WR800 was laminated while impregnating the flame retardant resin.
In the lamination of the third layer, the mat MC300 was laminated while impregnating the flame retardant resin.

Next, in the fourth step, the fourth layer and the fifth layer were sequentially laminated on the portion corresponding to the lower plate 120.
In the fourth layer, three unidirectional cross UT70-20G were laminated while impregnating the flame retardant resin.
In the lamination of the fifth layer, the mat MC300 was laminated while impregnating the flame retardant resin.
The fifth layer was laminated and the resin was cured on the second mold 320 to obtain the lower molded body 30.

Next, in the fifth step (step S5), the main beam 150, the cross beam 160, and the L angle 140 of the internal molded body 20 were molded. In forming the main beam 150, the first layer to the third layer were sequentially laminated on each of the pair of male third molding dies.
In the lamination of the first layer, the mat MC300 was laminated while impregnating the flame retardant resin.
In the lamination of the second layer, the roving cloth WR800 was laminated while impregnating the flame retardant resin.
In the lamination of the third layer, the mat MC300 was laminated while impregnating the flame retardant resin.

  After laminating the first layer to the third layer, the web part (150b) is bonded and clamped together with the third mold through the mat MC450 impregnated with the flame retardant resin, and after the resin is cured, the third The main beam 150 was obtained by removing from the mold.

  Next, in a fifth step, a predetermined number of notches for inserting a transverse girder 160 (described later) are machined in the first direction Y at a predetermined interval on the flange 150a side below the main girder 150.

In forming the cross beam 160, the first layer to the third layer were sequentially laminated on the fourth male mold.
In the lamination of the first layer, the mat MC300 was laminated while impregnating the flame retardant resin.
In the lamination of the second layer, the roving cloth WR800 was laminated while impregnating the flame retardant resin.
In the lamination of the third layer, the mat MC300 was laminated while impregnating the flame retardant resin.

  After laminating the first layer to the third layer, the resin was cured and removed from the fourth mold to obtain a cross beam 160.

In forming the L angle 140, the first layer to the third layer were sequentially laminated on an L-shaped mold.
In the lamination of the first layer, the mat MC300 was laminated while impregnating the flame retardant resin.
In the lamination of the second layer, the roving cloth WR800 was laminated while impregnating the flame retardant resin.
In the lamination of the third layer, the mat MC300 was laminated while impregnating the flame retardant resin.

  After laminating the first layer to the third layer, the resin was cured and demolded to obtain an L angle 140.

  Next, the sixth step (step S6) will be described with reference to FIGS. 1 and 22A. In the sixth step, the internal molded body 20 is disposed with respect to the lower molded body 30. Here, the cross beam 160, the main beam 150, and the L angle 140 were arranged in this order while bonding using a bonding resin.

  In the arrangement of the cross beam 160, the top plate 161 of the cross beam 160 is up, the longitudinal direction of the cross beam 160 is along the second direction X, and the first plate Y is placed on the lower plate 120 at a predetermined interval in the first direction Y. Several were arranged.

  In the arrangement of the main beam 150, the main beam 150 is arranged on the lower plate 120 so as to straddle the plurality of horizontal beams 160 in the first direction Y at the center in the second direction X.

  In the arrangement of the L angle 140, the first piece is placed in contact with the upper inner surface of the side plate 130, and the second piece is arranged so as to protrude inward in the second direction X. The upper surface of the second piece is flush with the upper flange 150a of the main beam 150.

  Next, in the seventh step (step S7), the mat MC450 is impregnated with a flame retardant resin in order to reinforce the corners of the contact portion and the intersecting portion between the main beam 150 and the cross beam 160. Overlay up. Similarly, in order to reinforce the corners inside the L angle 140, the mat MC450 is overlaid with the mat MC450 while being impregnated with a flame retardant resin. Note that “overlaying up” refers to laminating fiber substrates for reinforcement and joining of members and the like. Thus, overlaying was performed and the resin was cured to obtain a joined body of the internal molded body 20 and the lower molded body 30 as shown in FIG.

  Next, in the eighth step (step S8), as shown in FIG. 22B, an adhesive layer 145 for joining the upper molded body 10 to the lower bonded body (inner molded body 20 + lower molded body 30). Formed. The following three steps (steps S81 to S83) were performed, and an adhesive layer 145 was formed on the upper surface of the pair of L angles 140 and the upper surface of the flange 150a of the main girder 150.

  Specifically, a glass mat 145a impregnated with a flame retardant resin is placed on the mat MC450 (step S81). Next, the bonding resin 145b is applied to the glass mat 145a (step S82). Furthermore, a glass mat 145c obtained by impregnating the mat MC450 with a flame retardant resin is placed thereon (step S83).

  Next, in the ninth step (step S9), as shown in FIG. 22C, the upper molded body 10 is placed on the adhesive layer 145 formed in the eighth step with its gel coat surface facing up. Then, a weight was placed thereon, and the resin was cured while being crimped. After the resin was cured, the mold was removed from the second mold 320 to obtain the floor structure 100.

  Next, in the tenth step (step S10), as shown in FIG. 9, the attachment portion 200 was formed. Specifically, the following five steps (Step S101 to Step S105) were performed. First, a sheath tube portion 210 made of glass fiber reinforced resin previously prepared by sheet winding molding, filament winding molding or the like was prepared (step S101).

  Next, a hole corresponding to the outer diameter of the sheath tube portion 210 was drilled in the bottom portion (step surface thereof) of the enlarged diameter portion 205 formed together with the upper plate 110 (step S102). Next, a cylindrical body was inserted into the hole to form a sheath tube portion 210 (step S103). Next, on the inner side of the floor structure 100, the contact portion between the bottom portion of the enlarged diameter portion 205 and the upper end portion of the sheath tube portion 210, and the contact portion between the lower end portion of the sheath tube portion 210 and the lower plate 120 are provided. In order to reinforce, the mat MC450 was overlaid while impregnating the flame retardant resin (step S104).

  Next, after the flame retardant resin was cured and demolded, a hole corresponding to the inner diameter of the sheath tube portion 210 was passed through to complete the attachment portion 200 (step S105).

  Next, in the eleventh step (step S11), a drain hole 250 was formed in the lower plate 120 covered with the cross beam 160. In addition, the drain hole 250 may be provided in one place with respect to the lower board 120, and may be provided in multiple places. Thus, the floor structure 100 of Example 1 was obtained.

The total weight of the floor structure 100 of Example 1 obtained in this way was 75 [kg]. The weight of the floor structure 100 per projected area viewed from above was 30 [kg / m ² ]. The weight of the floor structure 100 of Example 1 was in the range of 20 [kg / m ² ] to 50 [kg / m ² ].

Next, on the metal frame (lower structure) provided on the floor at an interval of 5 [m], the lower plate 120 of the floor structure 100 is placed downward, and the crowd load is placed on the upper plate 110. When a flexible container having a weight equivalent to (5 kN / m ² ) was placed and the deflection (δc) of the center portion in the first direction Y of the floor structure 100 was measured, it was 9.85 [mm]. It was confirmed that the deflection (δc) was 1/500 or less. In actual construction, the mounting portion 200 is fixed to the receiving beam 190 which is the lower structure, so that it is clear that the deflection (δc) is further reduced in actual use.

  Further, the natural frequency was measured with reference to JISZ8735: 1981 (vibration level measurement method). Specifically, the center of the upper plate 110 of the floor structure 100 is placed in a state where the floor structure 100 is placed on the metal frame provided on the floor at intervals of 5 [m] as described above. A piezoelectric accelerometer is attached to the part with double-sided tape, and a vibration level meter VA-12 (made by Lion) described in JISC1510: 1955 is connected to this, and the floor structure 100 is hit with a plastic hammer and the natural frequency. Was measured.

  The measurement result was 25 [Hz], and it was confirmed that the natural frequency was not in the vicinity of 2 [Hz]. Of course, since the natural frequency is proportional to the elastic modulus and inversely proportional to the density (= weight), if this structure is formed of fiber reinforced resin, the weight of the structure itself becomes light, and an inappropriate 2 [Hz] It is easy to obtain a structure that avoids the natural frequency.

Similarly, referring to JIS A 1414-4: 2010 (Performance test method for building panels-Part 4: Long-term characteristics test), on the opposite base frame (for example, H-shaped steel) on the floor at an interval of 5 m In a state where the floor structure 100 is placed on the provided metal pedestal, the third direction Z is provided by a servo-controlled hydraulic cylinder provided at the top in the center of the first direction Y of the floor structure 100. A bending load corresponding to a crowd load (5 [kN / m ² ]) was repeatedly applied in one direction (downward). The repetition rate of the load is 120 times per minute. Every 100,000 times, the degree of deterioration such as deformation and peeling of the surface material was observed. This repeated bending fatigue test was conducted up to 2 million times, but no abnormality was observed in the appearance without breaking.

(Modification)
Next, a modified example of the floor structure 100 will be described. Differences from the floor structure 100 will be mainly described.

(First modification)
First, a floor structure 100B according to a first modification will be described next with reference to FIG. The floor structure 100B is different from the floor structure 100 in that a main girder 150B having a rectangular cross section perpendicular to the first direction Y is provided instead of the H-shaped main girder 150.

  The main girder 150B having a rectangular cross section has a main girder upper plate 150c, a main girder lower plate 150d, and a pair of main girder side plates 150e. The main girder upper plate 150c and the main girder lower plate 150d are arranged to face each other in the third direction Z. The pair of main girder side plates 150e are arranged facing the second direction X. Both ends of the main girder upper plate 150c in the second direction X are connected to upper ends of the pair of main girder side plates 150e. The lower ends of the pair of main girder side plates 150e are connected to both end portions in the second direction X of the main girder lower plate 150d.

  Further, the upper surface of the main girder upper plate 150 c is in contact with the lower surface of the upper plate 110. The lower surface of the main girder lower plate 150 d is in contact with the upper surface of the lower plate 120. The floor structure 100 </ b> B according to the first modified example has the same effects as the floor structure 100.

(Second modification)
Next, a floor structure 100C according to a second modification will be described with reference to FIG. The difference between the floor structure 100C and the floor structure 100 is that the floor structure 100C includes a main girder 150C in which a cross section perpendicular to the first direction Y forms a hat shape instead of the H-shaped main girder 150.

  A main girder 150C having a hat-shaped cross section includes a main girder upper plate 150c, a pair of main girder side plates 150e, and a pair of flanges 150f. The pair of flanges 150f have a plate shape and project outward from the lower ends of the pair of main girder side plates 150e in the second direction X. The lower surfaces of the pair of flanges 150f are in contact with the upper surface of the lower plate 120. The floor structure 100 </ b> C according to the second modified example has the same effects as the floor structure 100.

(Third Modification)
Next, a floor structure 100D according to a third modification will be described with reference to FIG. The floor structure 100D is different from the floor structure 100 in that an H-shaped cross beam 160B is provided instead of the hat-shaped cross beam 160.

  The H-shaped cross beam 160 </ b> B has a pair of flanges 165 and a web 166. The pair of flanges 165 are disposed to face the third direction Z. The web 166 connects the pair of flanges 165 to each other. The lower surface of the lower flange 165 is in contact with the upper surface of the lower plate 120. The floor structure 100 </ b> D according to the third modified example has the same operational effects as the floor structure 100.

(Fourth modification)
Next, a floor structure 100E according to a fourth modification will be described with reference to FIG. The floor structure 100E is different from the floor structure 100 in that instead of the hat-shaped cross beam 160, a cross beam 160C having a rectangular cross section orthogonal to the second direction X is provided.

  The cross beam 160 having a rectangular cross section includes a top plate 161, a pair of side plates 162, and a lower plate 167. The top plate 161 and the lower plate 167 face each other in the third direction Z. Both ends of the top plate 161 in the first direction Y are connected to the upper ends of the pair of side plates 162. The lower ends of the pair of side plates 162 are connected to both ends of the lower plate 167 in the first direction Y. The lower surface of the lower plate 167 of the cross beam 160 is in contact with the upper surface of the lower plate 120. The floor structure 100E according to the fourth modified example also has the same operational effects as the floor structure 100.

(5th modification)
Next, a floor structure 100F according to a fifth modification will be described with reference to FIG. The floor structure 100F is different from the floor structure 100 in that a C-shaped cross beam 160D is provided instead of the hat-shaped cross beam 160.

  The C-shaped cross beam 160 </ b> D has a pair of flanges 165 and a web 168. The pair of flanges 165 are disposed to face the third direction Z. The web 168 connects one ends of the pair of flanges 165 in the first direction Y. The lower surface of the lower flange 165 is in contact with the upper surface of the lower plate 120. The floor structure 100 </ b> F according to the fifth modified example has the same effects as the floor structure 100.

(Sixth Modification)
Next, a floor structure 100G according to a sixth modification will be described with reference to FIG. The difference between the floor structure 100G and the floor structure 100 is that a lower plate 120B having a width (W _121B ) of the central portion 121B smaller than a width (W) of the end portion 122 is provided.

  The lower plate 120B includes a central portion 121B, a pair of inclined portions 170B, and a pair of end portions 122. The inclined portion 170B has a trapezoidal shape when viewed from the first direction Y. The inclined portion 170B connects the central portion 121B and the end portion 122.

  The pair of side plates 130 of the floor structure 100 </ b> G has the lower side 130 a inclined toward the inner side in the second direction X. Specifically, it is inclined so as to follow the oblique side of the inclined portion 170B. The floor structure 100G according to the sixth modified example has the same function and effect as the floor structure 100.

(Seventh Modification)
Next, a floor structure 100H according to a seventh modification will be described with reference to FIG. The floor structure 100H is different from the floor structure 100 in that a lower plate 120C having a plurality of bulging portions in the second direction X is provided instead of the lower plate 120.

  The lower plate 120C includes a central portion 121C, 121D, and 121E, a pair of inclined portions 170C, and a pair of end portions 122. A plurality of inclined portions 170C are provided in the second direction X. The inclined portion 170C has, for example, a rectangular shape when viewed from the first direction Y. The inclined portions 170C are arranged to be separated from each other in the second direction X. The pair of inclined portions 170C that are separated in the second direction X are arranged on both sides of the central portion 121C in the first direction Y. The inclined portion 170C connects the central portion 121C and the end portion 122.

  A plurality of central portions 121 </ b> C are provided apart from each other in the second direction X. The plate thickness direction of the central portion 121C is arranged along the third direction Z. The central portion 121D extends upward from the inner end portion in the second direction X of the central portion 121C. The plate | board thickness direction of center part 121D is arrange | positioned along the 2nd direction. The central portion 121D extends in the third direction Z, for example, to the position of the end portion 122.

  The central part 121E is disposed between the pair of central parts 121D in the second direction X. The thickness direction of the central portion 121E is arranged along the third direction Z. The central portion 121E is disposed at the same position as the end portion 122 in the third direction Z. The central portion 121E is formed to be continuous with the end portions 122 on both sides in the first direction Y. Then, both end portions in the second direction X of the central portion 121E are connected to the upper end portion of the central portion 121D.

  In the lower plate 120C, a plurality of bulging portions that bulge downward are disposed on both sides with the central portion 121E interposed therebetween. The floor structure 100 </ b> H according to the seventh modified example also has the same effects as the floor structure 100.

(Eighth modification)
Next, a floor structure 100I according to an eighth modification will be described with reference to FIG. The difference between the floor structure 100I and the floor structure 100 is that a side plate 130B is provided instead of the side plate 130, and the shape of the bulging portion that bulges downward is different.

  The side plate 130B includes a central portion 131, both end portions 132, and a pair of widened portions 133B. The lower side of the widened portion 133B has a plurality of linear portions that are inclined at different angles with respect to the first direction Y. The lower side of the widened portion 133B is not limited to those inclined at the same inclination angle.

  Similarly, the inclined portion 170 of the lower plate 120 has a plurality of linear portions inclined at different angles with respect to the first direction Y corresponding to the lower side of the widened portion 133B when viewed from the second direction X. . The floor structure 100I according to the eighth modification has the same function and effect as the floor structure 100.

(Ninth Modification)
Next, a floor structure 100J according to a ninth modification will be described with reference to FIG. The floor structure 100J is different from the floor structure 100 in that instead of the side plate 130, a side plate 130C having a different shape of the bulging portion that bulges downward is provided.

  The side plate 130C includes a central portion 131, both end portions 132, and a pair of widened portions 133C. The shape of the lower side of the widened portion 133C is curved so as to bulge outward. The lower side of the widened portion 133C is not limited to a linear shape when viewed from the second direction X.

  Similarly, when viewed from the second direction X, the inclined portion 170 of the lower plate 120 is curved so as to bulge outward corresponding to the lower side of the widened portion 133C. The floor structure 100I according to the ninth modified example has the same effects as the floor structure 100.

(10th modification)
Next, a floor structure 100K according to a tenth modification will be described with reference to FIG. The difference between the floor structure 100 </ b> J and the floor structure 100 is that the shape of the bulging portion that bulges downward is different from the side plate 130.

  When viewed from the second direction X, the shape of the lower side of the side plate 130D of the floor structure 100K is curved so as to swell downward. The lower side of the side plate 130D is not limited to a straight line when viewed from the second direction X. The floor structure 100K according to the tenth modified example also has the same operational effects as the floor structure 100.

(Eleventh modification)
Next, a floor structure 100L according to a tenth modification will be described with reference to FIG. The difference between the floor structure 100L and the floor structure 100 is that the shape of the bulging portion that bulges downward is different from that of the side plate 130.

  The shape of the lower side of the side plate 130E of the floor structure 100L is inclined from the center in the first direction Y to reach the end 132 toward the outside, and forms a straight line. The floor structure 100L according to the eleventh modification also has the same effects as the floor structure 100.

(Second Embodiment)
Next, a floor structure 100M according to the second embodiment will be described with reference to FIG. The difference between the floor structure 100M of the second embodiment and the floor structure 100 of the first embodiment is that the side plate 130 is provided with an uneven shape. In addition, the description similar to the floor structure 100 of 1st Embodiment is abbreviate | omitted.

  One side plate 130 is provided with a concave portion (concave / convex shape) 280 a that is recessed inward in the second direction X. The recess 280a is formed over the entire length of the side plate 130 in the first direction Y. The recess 280a is formed so as to form, for example, a semicircular shape when viewed from the first direction Y. The recesses 280a are arranged linearly when viewed from the second direction X.

  The other side plate 130 is provided with a convex portion (concave / convex shape) 280 b that is convex outward in the second direction X. The convex portion 280 b is formed over the entire length of the side plate 130 in the first direction Y. The convex portion 280b is formed so as to form, for example, a semicircular shape when viewed from the first direction Y. The convex portions 280b are arranged linearly when viewed from the second direction X. The convex portion 28b has a shape that fits into the concave portion 280a of the other floor structure 100M facing the second direction X.

  In the floor structure 100M of the second embodiment, since the concave portions 280a and the convex portions 280b are respectively provided in the pair of side plates 130, when arranging the plurality of floor structures 100 side by side in the second direction X, Position alignment between the floor structures 100M is facilitated. Thereby, the height position of the upper surfaces of the upper plates 110 can be matched with high accuracy.

  Since the floor structure 100M can be used in the second direction X in this way, the length (W) in the second direction X of the floor structure 100M is reduced to reduce the weight per sheet. In addition, the handleability can be improved. The uneven shape is not limited to a semicircular shape, and may be, for example, a rectangular shape, a triangular shape, or other shapes.

(Third embodiment)
Next, a floor structure 100N according to a third embodiment will be described with reference to FIG. The difference between the floor structure 100N of the third embodiment and the floor structure 100 of the first embodiment is that the floor structure 100N includes a pair of main girders 150 instead of the pair of side plates 130, and does not include the lower plate 120. Is a point. In addition, the description similar to the floor structure 100 of 1st Embodiment is abbreviate | omitted.

  The pair of main girders 150 are spaced apart in the second direction X. The pair of main girders 150 are arranged so as to protrude downward from both ends of the upper plate 110 in the second direction X. A space is formed between the pair of main beams 150.

  The horizontal girder 160 extends in the second direction X and spans the pair of main girders 150. Both ends of the cross beam 160 in the second direction X are in contact with the upper surface of the lower flange 150a of the main beam 150.

  The floor structure 100N according to the third embodiment also has the same effects as the floor structure 100 according to the first embodiment.

(Fourth embodiment)
Next, a floor structure 100 according to a fourth embodiment will be described with reference to FIG. The fourth embodiment is different from the first embodiment in that the fixing method of the floor structure 100 is different. In the case of the first embodiment shown in FIG. 8, the floor structure 100 is fixed to the H-shaped girder 190, but in the fourth embodiment shown in FIG. 19, a concrete girder ( The floor structure 100 is fixed to the lower housing 195. The receiving girder 195 has, for example, a plate shape, the thickness direction is arranged along the first direction Y, and extends in the second direction X.

  An anchor bolt 225 that protrudes upward is provided on the upper part of the concrete receiving girder 195. The anchor bolt 225 is inserted into the sheath tube portion 210 and the nut 230 is tightened to fix the floor structure 100 to the receiving beam 195. In this way, the anchor structure 225 may be laid on the concrete structure to fix the floor structure 100.

(Fifth embodiment)
Next, a floor structure 100 according to a fifth embodiment will be described with reference to FIG. The fifth embodiment differs from the first embodiment in that a T-shaped closing plate 155 is installed between the floor structures 100 adjacent to each other in the first direction Y, and this closing plate 155 is arranged. This is a point having a recess 156.

The recess 156 is provided at an end portion in the first direction Y of the upper plate 110 and extends in the second direction X. The horizontal portion of the T-shaped closing plate 155 is accommodated in the recess 156, and the hanging portion orthogonal to the horizontal portion is disposed in the gap _dY100 between the floor structures 100 adjacent to each other in the first direction Y. As a result, the gap _dY100 between the floor structures 100 can be covered from above by the closing plate 155, so that a pedestrian can easily walk.

Further, the horizontal portion of the closing plate 155 has a predetermined width in the first direction Y. Thereby, even if the floor structure 100 expands and contracts due to a change in temperature and the size of the gap _dY100 changes, the gap _dY100 can be covered by the closing plate 155. Similarly, the closing plate 155 may be disposed between the floor structures 100 adjacent to each other in the second direction X.

(Sixth embodiment)
As shown in FIG. 21, the floor structure 100 may include a closing plate 157 that extends from the end portion of the upper plate 110 in the first direction Y toward the adjacent mating floor structure 100. . The closing plate 157 is in contact with the lower surface of the end portion of the upper plate 110 of the adjacent floor structure 100. The closing plate 157 prevents the gap _dY100 between the adjacent floor structures 100 from being exposed upward. Thereby, it becomes easy for a pedestrian to walk similarly to 5th Embodiment.

(Seventh embodiment)
Although the upper surface of the upper plate 110 of the floor structure 100 may be a flat surface, for example, irregularities may be formed. Innumerable protrusions are provided on the upper surface of the upper plate 110 of the floor structure 100 of the seventh embodiment. The protrusions may be, for example, a striped steel pattern, embossing, or other processing. This protrusion may be formed directly on the upper plate 110. Thereby, it can make it easy for a pedestrian to walk, for example at the time of rainy weather by raising frictional force.

  Further, for example, the protrusion may be formed by forming a coating film in which iron sand, silica stone, or the like is mixed on the upper surface of the upper plate 110.

  Further, for example, the protrusions may be formed by attaching a sheet-like or plate-like object having a fine uneven shape to the upper surface of the upper plate 110.

(Conventional technology)
Next, a conventional floor structure will be described.

  Conventionally, concrete floor structures manufactured by factories (trade name: Spancrete) are thin and can withstand long spans due to the action of prestressing muscles, and are also excellent in wear resistance and fire resistance. Once laid on the platform, it was practically sufficient as a floor structure.

However, the floor structure in which the base material is concrete is concerned with deterioration of concrete due to “neutralization”, “salt damage”, “freezing damage”, etc. in terms of strength and rigidity. Further, in terms of workability, for example, the thickness is 150 [mm] and the weight is 240 [kg / m ² ], which is very heavy and requires heavy equipment for laying and transporting. Such a floor structure has a problem that it is heavy and is difficult to handle and has a short installation distance during night construction. In other words, in the case of a floor structure laid on a railway platform, the construction time allowed for the laying work, excluding preparatory work and removal work, is approximately 2 to 2 between the passage of the last train and the start of the first train operation. Construction must be done in a short period of 3 hours. Therefore, the construction cost is inevitably expensive.

  Also, in recent years, home doors have been installed to prevent falling, but prestressed muscles are cut by drilling through bolts for installation to install and secure door opening and closing devices, so strength and rigidity There is a new problem of lowering.

The floor structure disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-47936) has a T-shaped structure in which an upper plate is disposed above a lower plate that is convex downward, and serves as a buckling prevention means on the lower surface of the upper plate. A sandwich structure is disclosed in which ribs are provided in the depth-width direction (parallel to the receiving girder), and a core portion is formed by a lightweight material U (lightweight cellular concrete) between a lower plate and an upper plate. The span is about 3,000 [mm] to 6,000 [mm], the thickness is about 150 [mm] to 250 [mm], and the weight per unit area [m ² ] is 130 [kg / m ² ]. It is described that the weight is reduced to about 1/3 to 1/2 of a conventional slab of the same size.

  In Patent Document 1, it is described that the manufacturing of the floor structure may be performed in a factory or a yard in the site, and may be performed on the site, but when it is installed in the short-time night construction described above, Manufacture in the yard in the field and on-site production are impossible. Non-patent document 1 (Hideo Oka, Shinya Igarashi, Satoshi Yamada, Hiroo Tohoku, 8th Symposium on the Use of Composite Composite Structure, “Lightweight Sandwich Floor with Steel Plate Adhered to Both Top and Bottom of ALC Panel (Lightweight Aerated Concrete Panel)” According to the version "), as a result of scrutinizing the basic structural characteristics, including the superiority of rigidity and proof strength of the sandwich structure floor structure, ALC (lightweight cellular concrete) Since it was revealed that shear failure precedes, it is considered that design considerations are necessary. Therefore, it is considered that development of a substitute structure for a floor structure made of concrete made by the factory will not progress.

  Furthermore, it is a well-known fact that when the core material is not sufficiently adhered (adhered) to the upper surface plate and the lower surface plate, the upper surface plate and the lower surface plate do not function as a compression member and a tension member via the core portion. is there. Therefore, the adhesive layer is provided between the lower surface of the upper plate made of metal and the upper surface of the core part, and there is a problem that the quality control and manufacturing process of the bonding is complicated and the manufacturing cost is expensive.

  Patent Document 2 (Japanese Patent Laid-Open No. 2012-97554) proposes a metal fiber reinforced concrete and a resin concrete that do not cut the prestressed streaks. However, according to Patent Document 3 (Japanese Patent No. 5168691), the metal fiber (steel fiber) has a short fiber length. Therefore, in concrete, mainly the improvement of the tenacity of the concrete structure, the load resistance on the concrete wall surface. Although it can provide properties such as increased force and reduced cross section, it is stated that the properties of the above-mentioned metal concrete can only be obtained under the condition that the metal fibers are evenly distributed. .

  In addition, resin concrete has almost the same specific gravity as conventional cement concrete, and bending strength is less than 1/5 of FRP. Therefore, in order to obtain the same strength, it is necessary to make it thicker than the thickness of the FRP structure. There is a limit to weight reduction.

  Patent Document 4 (Patent No. 4275448) describes a mounting structure having the same configuration as that of FIG. 5 of Patent Document 2, but any of these documents is a solid structure that is a concrete panel or a lightweight cellular concrete panel. Since it is a body, it can be manufactured by machining only by drilling or molding without paying special attention to the structure of the fastening portion.

  In order to reduce the weight, it is preferable that the inside of the structure is a hollow body. However, an attachment structure that can handle the tightening torque at the time of fixation is required.

  The present invention is not limited to the above-described embodiments, and various modifications as described below are possible without departing from the gist of the present invention.

  Although the case where the floor structure is applied to a railway platform has been described in the above embodiment, the floor structure is not limited to being applied to a platform. For example, the present invention can be applied to bridges (pedestrian bridges) that can be walked by pedestrians, flooring materials for houses, scaffolding plates for construction sites, and the like.

DESCRIPTION OF SYMBOLS 10 ... Upper molded object, 20 ... Internal molded object, 30 ... Lower molded object, 100, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K, 100L, 100M ... Structure for floors, 110 ... upper plate, 120 ... lower plate, 121, 121B, 121C, 121D, 121E ... center portion of lower plate, 122 ... end of lower plate, 130, 130B, 130C, 130D, 130E ... side plate, 130a ... lower side, 131: Central portion of side plate, 132: End portion of side plate, 133, 133B, 133C ... Widened portion of side plate, 150 ... Main girder, 140 ... L angle, 145 ... Adhesion layer, 145a, 145c ... Glass mat, 145b ... Adhesion Resin, 150a, 150f ... flange, 150b ... web, 150c ... main girder upper plate, 150d ... main girder lower plate, 150e ... main girder Plate, 155 ... T-shaped connecting plate, 156 ... Recessed portion, 157 ... Connecting plate, 160, 160B, 160C, 160D ... Cross beam, 161 ... Top plate of cross beam, 162 ... Side plate of cross beam, 163 ... Flange of cross beam DESCRIPTION OF SYMBOLS 164 ... Notch part, 165 ... Flange, 166, 168 ... Web, 167 ... Lower plate, 170, 170B ... Inclined part, 180 ... Opening, 190 ... Girder, 190a ... Flange, 195 ... Concrete girder , 200 ... mounting portion, 205 ... diameter-expanded portion, 210 ... sheath tube portion, 220 ... L bolt, 225 ... anchor bolt, 230 ... nut, 240 ... washer, 250 ... drain hole, 320 ... second mold, d _Y100 ... clearance, N ... neutral axis, X ... second direction, Y ... first direction, Z ... third direction.

Claims (10)

A floor structure supported by a pair of supports spaced apart in a first direction,
A direction intersecting the first direction in plan view is a second direction, a direction intersecting the first direction and the second direction is a third direction,
An upper plate that forms a plate shape, the plate thickness direction is arranged along the third direction, extends in the first direction, and forms a top portion;
A lower plate that forms a plate shape, the plate thickness direction is disposed along the third direction, extends in the first direction, opposes the upper plate in the third direction, and forms a bottom;
A plate shape is formed, the plate thickness direction is arranged along the second direction, extends in the first direction, opposes the second direction, connects the upper plate and the lower plate, and A pair of side plates each constituting a side part;
A main girder extending in the first direction and connected to the upper plate and the lower plate inside a hollow portion surrounded by the upper plate, the lower plate and the pair of side plates,
Inside the hollow portion, a plurality of cross beams extending in the second direction, intersecting with the main beam, connected to the lower plate and the pair of side plates, and arranged at predetermined intervals in the first direction And comprising
The elongate ratio (W / L), which is the ratio of the length (W) of the upper plate in the second direction to the length (L) of the upper plate in the first direction, is 1/10 or more and 1/1 or less. And
The side plate has a bulging portion that swells downward at a central portion in the first direction,
The lower plate is curved downward along the bulging portion,
A floor structure having a weight per unit area of 20 kg / m ² or more and 50 kg / m ² or less as viewed from above.   2. The floor use according to claim 1, wherein a ratio (He / Hc) of the height (Hc) of the bulging portion to a height (He) of both end portions in the first direction of the side plate is 1 or more and 3 or less. Structure. The main digit is
A first flange that contacts the lower surface of the upper plate;
A second flange contacting the upper surface of the lower plate;
The floor structure according to claim 1, further comprising a web connecting the first flange and the second flange. The horizontal beam is
A cross-girder upper plate that has a plate shape and the thickness direction is arranged along the third direction and extends in the second direction;
A pair of cross-girder side plates which are formed in a plate shape and whose thickness direction is arranged along the first direction and extend in the second direction and project downward from both sides of the cross-girder upper plate in the first direction; ,
A pair of cross beams that have a plate shape, the plate thickness direction is arranged along the third direction, extends in the second direction, is connected to the pair of cross beam side plates, and contacts the upper surface of the lower plate The floor structure according to any one of claims 1 to 3, further comprising a flange.   The upper plate, the lower plate, the pair of side plates, the main girder, and the cross beam are integrally formed of a fiber reinforced resin including a woven fabric base made of continuous reinforcing fibers. The floor structure according to one item.   10% to 40% of the thickness of the upper plate is made of a material including a continuous fiber base made of carbon fiber or glass fiber and continuous in one direction in the first direction. The floor structure according to any one of the above.   10% or more and 40% or less of the plate thickness of the lower plate is made of a material including a continuous fiber substrate made of carbon fiber or glass fiber and continuous in one direction in the first direction. The floor structure according to any one of the above. Cylindrical portions that form attachment holes are provided at both ends in the first direction,
The mounting hole penetrates in the third direction from the upper plate to the lower plate,
The cylindrical part is
An enlarged diameter portion formed on the upper plate side;
A sheath tube portion connected to the enlarged diameter portion through a stepped portion and having an inner diameter smaller than the inner diameter of the enlarged diameter portion and formed on the lower plate side. The floor structure described in 1. The floor structure is arranged side by side in the second direction,
The floor structure according to any one of claims 1 to 8, wherein an uneven shape is formed on the outer surface of the side plate as a fitting portion extending in the first direction. A floor structure supported by a pair of supports spaced apart in a first direction,
A direction intersecting the first direction in plan view is a second direction, a direction intersecting the first direction and the second direction is a third direction,
An upper plate that forms a plate shape, the plate thickness direction is arranged along the third direction, extends in the first direction, and forms a top portion;
A pair of main beams connected to the upper plate at both ends in the second direction and projecting downward and extending in the first direction;
A plurality of cross girders extending in the second direction between the pair of main girders, connected to the lower side of the pair of main girders and arranged at predetermined intervals in the first direction,
The elongate ratio (W / L), which is the ratio of the length (W) of the upper plate in the second direction to the length (L) of the upper plate in the first direction, is 1/10 or more and 1/1 or less. And
The pair of main girders has a bulging portion that bulges downward in a central portion in the first direction,
A floor structure having a weight per unit area of 20 kg / m ² or more and 50 kg / m ² or less as viewed from above.

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