JP2008238884A - Vehicle floor structure and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a vehicle floor structure capable of easily assembling a tunnel member on an upper surface on an upper surface of a floor member made to be an assembly by joining a cross member and an tunnel reinforcement, and a manufacturing method thereof. <P>SOLUTION: In the floor structure 10, a seat cross member 22 is divided into a main body portion 24 and an auxiliary portion 26. The main body portion 24 is joined on an upper surface of a floor panel 14 (a floor member), and the auxiliary portion 26 is laid between the main body portion 24 and the tunnel member 12 above a flange portion 12A of the tunnel member 12 to be joined to both. Therefore, when the floor structure 10 is manufactured, the main body portion 24 of the seat cross member 22 and a tunnel reinforcement 20 are joined on the floor panel 14 in advance, and the tunnel member 12 (the flange portion 12A) is joined on the floor panel 14. Then, the auxiliary portion 26 of the seat cross member 22 can be joined with the main body portion 24 and the tunnel member 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a floor structure constituting a floor portion of a vehicle and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a vehicle floor is known that includes a tunnel member, left and right floor members, and left and right longitudinal frame members (tunnel reinforcement) (see, for example, Patent Document 1). On this floor, spot welding is performed in a state in which the left and right edge portions (flange portions) of the tunnel member, the floor member, and the flange portion of the tunnel reinforcement are overlapped. A cross member is joined to the upper surface of the floor member along the vehicle width direction.

On the other hand, a technique for improving the welding strength of the three members without increasing the mass is known by sandwiching and welding a thin plate member with a thick plate member (see, for example, Patent Document 2). When such a known technique is applied to the floor as described above, for example, a floor member having a small thickness is sandwiched and welded between a tunnel member having a large thickness and tunnel reinforcement, and the three The welding strength can be improved.
JP-A-6-206580 JP 2004-196109 A

  By the way, when a floor as described above is manufactured, a tunnel reinforcement and a cross member may be assembled to the floor member in advance before assembling the floor member to the tunnel member. In this case, if the tunnel member is to be assembled to the upper surface of the sub-assembled floor member in order to obtain the structure of the above-described known technique, the cross member may interfere and the assembly may be difficult.

  In consideration of the above-described facts, the present invention provides a vehicle floor structure and a method for manufacturing the same, in which the tunnel member can be easily assembled on the upper surface of the floor member that is joined by the cross member and the tunnel reinforcement. Is the purpose.

  According to a first aspect of the present invention, there is provided a method for manufacturing a vehicle floor structure, wherein the vehicle floor structure is provided at an intermediate portion in the vehicle width direction of the vehicle body floor portion, extends in the vehicle body front-rear direction, and has flange portions on both left and right sides. A tunnel member, a floor member provided on both the left and right sides of the tunnel member, the flange member being joined to the upper surface of the end on the tunnel member side, and the floor member being joined to the lower surface of the floor member and between the flange portion A tunnel reinforcement sandwiching the floor member, a main body part joined to the upper surface of the floor member and extending in the vehicle width direction, and spanning between the main body part and the tunnel member above the flange part And a cross member provided with an auxiliary portion joined to both of the vehicle and a floor structure of the vehicle, wherein the main body portion and the tunnel of the cross member are attached to the floor member. After joining the reinforcement, the said flange portion of the tunnel member is joined to said floor member, and characterized in that further joining said auxiliary section of the cross member to the main body portion and said tunnel member thereafter.

  In the vehicle floor structure according to the first aspect, the cross member is divided into a main body portion and an auxiliary portion. In the manufacturing method according to claim 1, after the cross member main body and the tunnel reinforcement are joined to the floor member, the flange member of the tunnel member is joined to the floor member, and then the auxiliary member of the cross member. Are joined to the main body of the cross member and the tunnel member. Therefore, the tunnel member can be easily assembled on the upper surface of the floor member that is sub-assembled by joining the main body portion of the cross member and the tunnel reinforcement.

  According to a second aspect of the present invention, a method for manufacturing a vehicle floor structure is provided at a vehicle width direction intermediate portion of a vehicle body floor portion, extends in the vehicle body front-rear direction, and has flange portions on both right and left sides. A tunnel member, a floor member provided on both the left and right sides of the tunnel member, the flange member being joined to the upper surface of the end on the tunnel member side, and the floor member being joined to the lower surface of the floor member and between the flange portion And the tunnel reinforcement sandwiched between the floor member and the upper surface of the floor member and extending in the vehicle width direction, and a gap is provided between the end of the tunnel member and the floor member. And a cross member in which an end on the tunnel member side is joined to the tunnel member in a state where the flange portion is disposed on the vehicle, After joining the cross member and the tunnel reinforcement in the lower member, and inserting the flange portion of the tunnel member in the gap it is characterized by joining the flange portion to the floor member.

  In the vehicle floor structure according to the second aspect, a gap is provided between the end of the cross member joined to the tunnel member and the floor member. In the manufacturing method according to claim 2, after the cross member and the tunnel reinforcement are joined to the floor member, the flange portion of the tunnel member is inserted into the gap between the end of the cross member and the floor member. Bonded to the floor member. Therefore, the tunnel member can be easily assembled on the upper surface of the floor member that is sub-assembled by joining the cross member and the tunnel reinforcement.

  According to a third aspect of the present invention, there is provided a vehicle floor structure including a tunnel member provided at an intermediate portion in a vehicle width direction of a vehicle body floor portion, extending in a vehicle body front-rear direction and having flange portions on both left and right sides. A floor member provided on both the left and right sides of the tunnel member, the flange portion being joined to the upper surface of the end portion on the tunnel member side, and the floor member being joined to the lower surface of the floor member and the flange portion. Tunnel reinforcement for sandwiching the member, a main body part joined to the upper surface of the floor member and extending in the vehicle width direction, and both of the bridge part between the main body part and the tunnel member above the flange part And a cross member provided with an auxiliary portion joined to each other.

  In the vehicle floor structure according to the third aspect, the cross member is divided into a main body portion and an auxiliary portion joined to the upper surface of the floor member. The auxiliary portion is configured to be spanned between the main body portion and the tunnel member above the flange portion of the tunnel member and joined to both. For this reason, when manufacturing this floor structure, after joining the main part of the cross member and the tunnel reinforcement to the floor member, the flange part of the tunnel member is joined to the floor member, and then the auxiliary of the cross member. The part can be joined to the main body part and the tunnel member. Therefore, even when the cross member main body and the tunnel reinforcement are joined to the floor member to form a sub-assembly, the tunnel member can be easily assembled to the upper surface of the sub-assembled floor member.

  A vehicle floor structure according to a fourth aspect of the present invention is the vehicle floor structure according to the third aspect, wherein the auxiliary portion of the cross member is overlapped in the plate thickness direction with respect to the main body portion. In addition, the vehicle seat is attached to the overlapping portion.

  In the vehicle floor structure according to the fourth aspect, the vehicle seat is attached to the overlapping portion between the auxiliary portion and the main body portion of the cross member. For this reason, in order to attach the vehicle seat to the cross member, it is possible to eliminate the need to apply special reinforcement to the cross member.

  As described above, in the vehicle floor structure according to the present invention and the manufacturing method thereof, the tunnel member can be easily assembled on the upper surface of the floor member joined by the cross member and the tunnel reinforcement. .

<First Embodiment>
Hereinafter, a vehicle floor structure according to a first embodiment of the present invention will be described with reference to FIGS. It should be noted that an arrow FR appropriately shown in these drawings indicates a vehicle front direction, an arrow UP indicates a vehicle upward direction, and an arrow IN indicates a vehicle width inside direction.

  FIG. 1 is a perspective view showing a partial configuration of a vehicle floor structure 10 according to the first embodiment. 2 shows a cross-sectional view taken along line 2-2 of FIG. The floor structure 10 shown in these drawings constitutes a vehicle body floor portion, and includes a tunnel member 12 extending in the vehicle longitudinal direction at the vehicle width direction center portion of the vehicle body floor portion, and the tunnel member 12. Plate-like floor panels 14 (floor members) provided on both the left and right sides.

  The tunnel member 12 bulges toward the upper side of the floor panel 14 and opens to the lower side, and a flange portion 12A that protrudes to the left and right sides is provided at the end on the opening side. These flange portions 12A are joined to the upper surface of the inner end portion in the vehicle width direction of the floor panel 14 by spot welding. Thereby, the tunnel member 12 and the floor panel 14 are integrally coupled.

  Further, the front end portions of the tunnel member 12 and the floor panel 14 are joined to the lower end portion of the dash panel 16 that partitions the engine room and the vehicle interior side, and the vehicle width direction outer side end portion of the floor panel 14 is the vehicle body side portion. Is coupled to a rocker 17 (see FIG. 3) extending in the longitudinal direction of the vehicle body.

  A front side member 18 and a tunnel reinforcement 20 are provided on the lower side of the floor panel 14. The front side member 18 extends along the vehicle body front-rear direction below the intermediate portion in the vehicle width direction of the floor panel 14. Further, the tunnel reinforcement 20 extends in the vehicle longitudinal direction on the inner side in the vehicle width direction than the front side member 18. The front end side of the tunnel reinforcement 20 is bent outward in the vehicle width direction and joined to the side portion of the front side member 18.

  Both the front side member 18 and the tunnel reinforcement 20 are formed in a hat shape in cross section, and are arranged with the opening portion facing upward. Flange portions 18A, 20A projecting to the left and right sides are provided at the opening side end portions of the front side member 18 and the tunnel reinforcement 20, and these flange portions 18A, 20A are joined to the lower surface of the floor panel 14. ing. Thereby, the front side member 18 and the tunnel reinforcement 20 are integrally coupled to the floor panel 14, and the floor panel 14 is reinforced by the front side member 18 and the tunnel reinforcement 20.

  Here, as shown in FIG. 2, the flange portion 20 </ b> A on the inner side in the vehicle width direction of the tunnel reinforcement 20 is joined to the lower surface of the joint portion between the flange portion 12 </ b> A of the tunnel member 12 and the floor panel 14. 12A, the floor panel 14, and the flange part 20A are joined by spot welding in a state where three sheets overlap each other. Moreover, the plate thickness of the tunnel member 12 and the tunnel reinforcement 20 is set to be thicker than the plate thickness of the floor panel 14, and the thin plate panel 14 is sandwiched between the thick flange portions 12 </ b> A and 20 </ b> A. It has become.

  On the other hand, a seat cross member 22 is provided above the floor panel 14. The seat cross member 22 has a main body 24 extending along the vehicle width direction. The main body 24 is formed in a hat shape in cross section, and is arranged with the opening directed downward. Flange portions 24A projecting to the front and rear sides are provided at the end of the main body portion 24 on the opening side, and these flange portions 24A are joined to the upper surface of the floor panel 14 by spot welding. Thereby, the main body 24 is integrally coupled to the floor panel 14.

  A flange portion 24 </ b> B is provided at an outer end portion of the main body portion 24 in the vehicle width direction so as to protrude upward and front and rear sides. The flange portion 24 </ b> B is joined to the rocker 17. Further, the vehicle width direction inner side end portion of the main body portion 24 is disposed close to the flange portion 12 </ b> A of the tunnel member 12. That is, the vehicle width direction inner side end portion of the main body portion 24 is separated from the tunnel member 12 in order to join the flange portion 12A of the tunnel member 12 to the upper surface of the floor panel 14. An auxiliary portion 26 constituting the seat cross member 22 is stretched between the inner end portion of the main body portion 24 in the vehicle width direction and the tunnel member 12.

  The auxiliary portion 26 has a U-shaped cross section, and is disposed above the flange portion 12A with the opening portion facing downward. A gap 28 is formed between the auxiliary portion 26 and the floor panel 14, and the flange portion 12 </ b> A of the tunnel member 12 is disposed in the gap 28.

  The outer end of the auxiliary portion 26 in the vehicle width direction is fitted to the inner end of the main body 24 in the vehicle width direction, and the auxiliary portion 26 is overlapped with the main body 24 in the thickness direction by spot welding. It is joined. Further, a flange portion 26A that protrudes toward the upper side and both front and rear sides is provided at the inner end in the vehicle width direction of the auxiliary portion 26, and this flange portion 26A is joined to the side wall 12B of the tunnel member 12 by spot welding. Has been.

  As shown in FIG. 3, the seat cross member 22 configured as described above is disposed below the vehicle seat 30. In the seat 30, a leg portion 32 on the outer side in the vehicle width direction is fastened to an outer portion in the vehicle width direction on the upper portion of the main body portion 24, and a leg portion 34 on the inner side in the vehicle width direction 27 is fastened to the top. A reinforcing bracket 32 is joined to the inside of the main body portion 24 at a position where the leg portion 32 is fastened.

  Next, the operation of the first embodiment will be described.

  In the floor structure 10 having the above configuration, the seat cross member 22 is joined to the main body 24 and the tunnel member 12 above the main body 24 joined to the upper surface of the floor panel 14 and the flange 12A of the tunnel member 12. It is divided into an auxiliary part 26. Therefore, when the floor structure 10 is manufactured, as shown in FIG. 4A, the main body 24 of the seat cross member 22, the tunnel reinforcement 20, and the front side member 18 are joined to the floor panel 14 in advance. After that, the tunnel member 12 (flange portion 12A) is joined to the floor panel 14, and then, as shown in FIG. 4B, the auxiliary portion 26 of the seat cross member 22 is connected to the main body portion 24 and the tunnel member. 12 can be joined. Therefore, even when the main body 24, the tunnel reinforcement 20 and the front side member 18 of the seat cross member 22 are joined to the floor panel 14 and sub-assembled in advance, it can be easily applied to the upper surface of the sub-assembled floor panel 14. The tunnel member 12 can be assembled.

  That is, as shown in FIG. 5, when the seat cross member 22 is not divided, the flange portion 12A of the tunnel member 12 is joined to the upper surface of the floor panel 14 that is sub-assembled as described above. I can't. For this reason, the flange portion 12 </ b> A of the tunnel member 12 is joined to the lower side of the flange portion 20 </ b> A of the tunnel reinforcement 20. In this case, the floor panel 14 having a thin plate thickness is disposed outside, and the welding strength of the floor panel 14 cannot be improved without increasing the mass.

  In this respect, in the first embodiment, since the flange portion 12A of the tunnel member 12 can be joined to the upper surface of the floor panel 14 subassembled as described above, the manufacturing efficiency is improved by subassembly. Moreover, the improvement of the welding strength of the floor panel 14 can be made compatible.

  Further, in the first embodiment, the auxiliary portion 26 of the seat cross member 22 is joined to the main body portion 24 in a state of being superposed in the plate thickness direction, and one leg portion of the sheet 30 is joined to the superposed portion 27. 34 is fastened. For this reason, in order to fasten the one leg 34 of the seat 30 to the seat cross member 22, it is not necessary to apply special reinforcement to the seat cross member 22, and the conventionally provided reinforcing bracket can be eliminated.

  Furthermore, in the first embodiment, the flange portion 12 </ b> A of the tunnel member 12 is disposed in the gap 28 between the auxiliary portion 26 of the seat cross member 22 and the floor panel 14. For this reason, as shown in FIG. 6, the above-described gap 28 can be used as a large working hole when the sealing agent 38 is applied to the joint between the flange portion 12 </ b> A and the floor panel 14. Accordingly, workability when applying the sealing agent 38 can be improved.

  Furthermore, in the first embodiment, the flange portion 12A of the tunnel member 12 is disposed in the gap 28 between the auxiliary portion 26 of the seat cross member 22 and the floor panel 14 as described above. For this reason, the spot of the spot welding of the flange part 12A, the floor panel 14, and the flange part 20A can be set also below the auxiliary part 26. Therefore, the welding strength of the three parties can be further improved.

  Although the flange portion 12A of the tunnel member 12 is joined to the flange portion 20A on the inner side in the vehicle width direction of the tunnel reinforcement 20 in the first embodiment, the present invention is not limited to this, and the tunnel member The 12 flange portions 12A may be joined to at least one of the flange portion 20A on the inner side in the vehicle width direction of the tunnel reinforcement 20 and the flange portion 20A on the outer side in the vehicle width direction.

Next, another embodiment of the present invention will be described. In addition, about the structure and effect | action fundamentally similar to the said 1st Embodiment, the same sign as the said 1st Embodiment is provided, and the description is abbreviate | omitted.
<Second Embodiment>
FIG. 7 is a sectional view showing a partial configuration of a vehicle floor structure 40 according to the second embodiment of the present invention. The floor structure 40 has basically the same configuration as the floor structure 10 according to the first embodiment, but the configuration of the seat cross member 42 is the seat cross member according to the first embodiment. 22 is different.

  The seat cross member 42 has basically the same configuration as the seat cross member 22 according to the first embodiment, but the outer end of the main body 24 in the vehicle width direction is separated from the rocker 17. . An auxiliary portion 44 having basically the same configuration as that of the auxiliary portion 26 is spanned between the outer end portion of the main body portion 24 in the vehicle width direction and the rocker 17. As for this auxiliary | assistant part 44, the flange part 44A provided in the vehicle width direction outer side edge part is joined to the rocker 17. As shown in FIG. Further, the inner end portion in the vehicle width direction of the auxiliary portion 44 is fitted to the outer side of the outer end portion in the vehicle width direction of the main body portion 24, and the auxiliary portion 44 is overlapped with the main body portion 24 in the plate thickness direction. It is joined by spot welding. And the leg part 32 of the vehicle width direction outer side of the vehicle seat 30 is fastened to the overlapping part 46 of the auxiliary part 44 and the main body part 24.

  This embodiment also has basically the same operational effects as the first embodiment. In addition, in this embodiment, a load input to the rocker 17 at the time of a side collision of the vehicle is input to the cushion frame (not shown) of the seat 30 via the auxiliary portion 44 and the leg portion 32. The load input to the cushion frame as described above is input to the tunnel member 12 through the leg portion 34 and the auxiliary portion 44. For this reason, since the ratio by which the said load is input into the main-body part 24 can be reduced, the intensity | strength of the main-body part 24 can be reduced by making the plate | board thickness of the main-body part 24 thin. Therefore, it is possible to reduce the weight.

Moreover, in this embodiment, since the shape of the main-body part 24 is simplified, the main-body part 24 can be manufactured cheaply by the bending process of a press. That is, when the main body portion 24 is directly joined to the tunnel member 12 or the rocker 17, a joining flange portion to the tunnel member 12 or the rocker 17 must be formed in the main body portion 24. When such a joining flange portion is formed by bending a press, an unnecessary cut must be set in the main body portion 24, but such a cut becomes a starting point of breakage when a load is applied. For this reason, when the main body 24 is directly joined to the tunnel member 12 or the rocker 17, it is necessary to manufacture the main body 24 by press drawing or the like. In this respect, in this embodiment, since it is not necessary to set the joining flange part to the tunnel member 12 or the rocker 17 in the main-body part 24, it can manufacture at low cost by the bending process of a press.
<Third Embodiment>
FIG. 8 is a perspective view of a vehicle floor structure 50 according to a third embodiment of the present invention. The floor structure 50 has basically the same configuration as the floor structure 10 according to the first embodiment, but the configuration of the seat cross member 52 is the seat cross member according to the first embodiment. 22 is different.

  The seat cross member 52 is not divided into the main body portion 24 and the auxiliary portion 26 like the seat cross member 22 according to the first embodiment, and is configured to be integrally formed. The seat cross member 52 has front and rear flange portions 52A joined to the upper surface of the floor panel 14 and extends along the vehicle width direction. A flange portion 52B provided at the outer end in the vehicle width direction of the seat cross member 52 is joined to the rocker 17, and a flange portion 52C provided at the inner end in the vehicle width direction of the seat cross member 52 is a tunnel member. 12 side walls 12B. However, a notch 52D is formed below the inner end of the seat cross member 52 in the vehicle width direction. Therefore, a gap 54 is provided between the inner end of the seat cross member 52 in the vehicle width direction and the floor panel 14, and the flange portion 52 </ b> A of the tunnel member 12 is disposed in the gap 54. .

  When the floor structure 50 having the above-described configuration is manufactured, as shown in FIG. 9, after the seat cross member 52, the tunnel reinforcement 20, and the front side member 18 are joined to the floor panel 14, the seat cross member 52. The flange portion 52A of the tunnel member 12 can be inserted into the gap 54 between the inner end in the vehicle width direction and the floor panel 14, and the flange portion 52A can be joined to the floor panel 14. That is, the tunnel member 12 can be assembled in the sliding direction (the direction of arrow S in FIG. 9) with respect to the floor panel 14 that is sub-assembled by joining the seat cross member 52, the tunnel reinforcement 20, and the front side member 18. it can. Therefore, the tunnel member 12 can be easily assembled on the upper surface of the floor panel 14 subassembled as described above. Therefore, this embodiment also has basically the same operational effects as the first embodiment.

1 is a perspective view showing a partial configuration of a vehicle floor structure according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is sectional drawing which shows the partial structure of the floor structure shown by FIG. It is a figure for demonstrating the manufacturing method of the floor structure shown by FIG. 1, (A) is a disassembled perspective view for demonstrating the assembly method of the tunnel member to the floor member made into sub-assembly, (B) is an exploded perspective view for explaining how to assemble the auxiliary portion of the seat cross member. It is sectional drawing for demonstrating the conventional manufacturing method. It is a perspective view which shows the state by which the sealing compound was apply | coated to the floor structure shown by FIG. It is sectional drawing which shows the partial structure of the floor structure which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the partial structure of the floor structure based on the 3rd Embodiment of this invention. It is a disassembled perspective view for demonstrating the manufacturing method of the floor structure shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Floor structure 12 Tunnel member 12A Flange part 14 Floor panel (floor member)
DESCRIPTION OF SYMBOLS 20 Tunnel reinforcement 20A Flange part 22 Seat cross member 24 Main body part 26 Auxiliary part 27 Superposition part 30 Vehicle seat 40 Floor structure 42 Seat cross member 44 Auxiliary part 46 Superposition part 50 Floor structure 52 Seat cross member 52D Notch 54 Clearance

Claims (4)

A tunnel member provided in the vehicle width direction intermediate portion of the vehicle body floor portion, extending in the vehicle body longitudinal direction, and having flange portions on the left and right sides;
A floor member provided on both the left and right sides of the tunnel member, and the flange portion joined to the upper surface of the end portion on the tunnel member side;
Tunnel reinforcement which is joined to the lower surface of the floor member and sandwiches the floor member between the flange portion,
A main body part joined to the upper surface of the floor member and extending in the vehicle width direction, and an auxiliary part which is spanned between the main body part and the tunnel member above the flange part and joined to both. A cross member with
A vehicle floor structure manufacturing method comprising:
After joining the main body portion of the cross member and the tunnel reinforcement to the floor member, the flange portion of the tunnel member is joined to the floor member, and then the auxiliary portion of the cross member is joined to the main body portion. And the manufacturing method of the floor structure of a vehicle characterized by joining to the said tunnel member. A tunnel member provided in the vehicle width direction intermediate portion of the vehicle body floor portion, extending in the vehicle body longitudinal direction, and having flange portions on the left and right sides;
A floor member provided on both the left and right sides of the tunnel member, and the flange portion joined to the upper surface of the end portion on the tunnel member side;
Tunnel reinforcement which is joined to the lower surface of the floor member and sandwiches the floor member between the flange portion,
While being joined to the upper surface of the floor member and extending in the vehicle width direction, a gap is provided between the end on the tunnel member side and the floor member, and the flange portion is disposed in the gap. A cross member whose end on the tunnel member side is joined to the tunnel member;
A vehicle floor structure manufacturing method comprising:
A vehicle floor structure characterized in that after the cross member and the tunnel reinforcement are joined to the floor member, the flange portion of the tunnel member is inserted into the gap to join the flange portion to the floor member. Body manufacturing method. A tunnel member provided in the vehicle width direction intermediate portion of the vehicle body floor portion, extending in the vehicle body longitudinal direction, and having flange portions on the left and right sides;
A floor member provided on both the left and right sides of the tunnel member, and the flange portion joined to the upper surface of the end portion on the tunnel member side;
Tunnel reinforcement which is joined to the lower surface of the floor member and sandwiches the floor member between the flange portion,
A main body part joined to the upper surface of the floor member and extending in the vehicle width direction, and an auxiliary part which is spanned between the main body part and the tunnel member above the flange part and joined to both. A cross member with
A vehicle floor structure.   4. The vehicle according to claim 3, wherein the auxiliary portion of the cross member is joined to the main body portion in a state of being overlapped in a plate thickness direction, and a vehicle seat is attached to the overlapping portion. Floor structure.

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