JP5166918B2 - Floor joint cover device - Google Patents

Description

  The present invention relates to a floor joint cover device that covers joints between floors of adjacent buildings.

  In a building whose lower part is supported by a seismic isolation device having a shock absorbing function, horizontal shaking during an earthquake tends to increase. A relatively wide joint capable of absorbing the shaking is formed between adjacent seismic isolation structures and adjacent artificial ground, which is suitable for joints of such seismic isolation structures. A floor joint cover device that can be used has already been proposed by the present applicant (see, for example, Patent Document 1).

  As shown in FIG. 11 (A), such a floor joint cover device is formed between a floor f of a building A as a building and a building B as an artificial ground adjacent to the floor f via a joint s. One end of the cover body C that is passed over to cover the joint s is slidably connected to the side edge of the floor f via a connecting means a, and the other end of the cover body C is used as a free end, An end edge cover plate c is provided at the free end with an inclined edge b that is inclined from the lower surface toward the upper surface of the outer end, and substantially flush with the upper surface d of the cover body C from the upper portion of the inclined edge b. Projecting toward the building B side, a horizontal receiving edge e on the side edge of the building B, and an inclination receiving member inclined in the same direction as the inclined end edge b at the outer end of the horizontal receiving edge e. A sliding receiving frame h provided with an edge g, and a free end of the cover body C mounted on the horizontal receiving edge e of the sliding receiving frame h; The outer end of the end cover plate c is placed on the floor surface i of the building B, and the end cover plate c is interposed between the inclined end edge b of the cover body C and the inclined receiving edge g of the sliding receiving frame h. The upper part of the generated working gap j is shielded.

In the event of an earthquake, when the building A and the adjacent building B are relatively relatively displaced in the approaching direction, the free end of the cover body C moves over the horizontal receiving edge e of the sliding receiving frame h. When horizontally sliding within the range of the working gap j and following the relative displacement, and when the relative displacement is further increased, as shown in FIG. 11 (B), the cover body C uses the connecting means a at one end as a fulcrum. The inclined end edge b formed at the free end is displaced along the inclined receiving edge g of the sliding receiving frame h, so that it can escape from the relative displacement.
JP 10-317516 A

  By the way, the cover body C of the conventional floor joint cover device divides the inside of a peripheral frame in which a plurality of metal plates are assembled in a rectangular shape by a partition plate, and the upper portion thereof is a recess for filling a pavement material. On the other hand, a metal rigid base frame part in which a plurality of main bars and cross bars are assembled in a lattice shape is disposed at the lower part, or a rectangular metal cover is provided above the rigid base frame part. A plate is arranged. Here, the rigid base frame portion has the same structure as that generally used as a grating, and the rigid base frame portion obtains a high strength capable of withstanding the load of the vehicle or the like on the cover body C. .

  Thus, the cover C having the conventional configuration is manufactured by assembling a plurality of metal plates and metal rods pre-processed into a predetermined shape by welding. There was a problem of being bad. Therefore, in order to eliminate such pre-processing and welding work of the component parts, it was attempted to integrally form the cover body by casting. However, in the case of the cover body integrally formed by casting, Therefore, there is a problem that a slight backlash occurs when this is placed on a smooth surface because a dimensional error due to warpage or shrinkage is likely to occur and the level of the bottom surface is difficult to obtain.

  It is an object of the present invention to provide a floor joint cover device including a cover body that can eliminate such problems.

  In the present invention, one end of a cover body that is passed over a joint between floors of adjacent buildings and covers the joint is connected to a side edge of one floor in a swingable manner via a connecting means, In the floor joint cover device in which the other end of the cover body is a free end and the free end is slidably mounted on the side edge of the other floor, the cover body is a rectangular main plate covering the joint And a reinforcing rib portion composed of a plurality of protrusions disposed on the lower surface of the main plate portion, and the main plate portion and the reinforcing rib portion are integrally formed by casting, and the front end edge of the main plate portion is formed. A floor joint cover device in which a height adjusting cutting margin is coupled to a lower surface and a lower end of a predetermined ridge constituting the reinforcing rib portion.

  Here, the height adjusting cutting allowance is integrally formed at the time of casting the cover body, and by extending the lower surface of the front edge of the main plate portion and the lower end of the ridge downward by a predetermined length. It is formed in a narrow band shape.

  In this floor joint cover device, the front edge and the ridge of the main plate portion where the height adjusting cutting allowances are coupled are in contact with the side edges of the floor of the building, and along the joint. And a plurality of cutout grooves formed along the longitudinal direction of the front end edge of the main plate portion and the ridges. Is proposed.

  In the present invention, as described above, the cover body includes the rectangular main plate portion covering the joint, and the reinforcing rib portion including a plurality of protrusions disposed on the lower surface of the main plate portion, and the main plate portion. And the reinforcing rib portion are integrally formed by casting, and a height adjusting cutting margin is coupled to the lower surface of the front end edge of the main plate portion and the lower end of the predetermined protrusion constituting the reinforcing rib portion. Therefore, if the cast cover body is rattled, the height adjustment cutting margin partly connected to the lower surface of the front edge of the main plate part and the lower end of the ridge is partially By removing the necessary amount and adjusting the height, the backlash can be eliminated. Here, since the cutting allowance for height adjustment can be coupled in a narrow band shape, the scraping work can be performed easily and quickly compared to the case where the bottom surface of the cover body formed in a flat plate shape is scraped over a wide range. Can be done.

  Further, the front end edge and the ridge of the main plate portion where the height adjusting cutting allowances are coupled are arranged so as to extend in a direction along the joint at a position where they abut against the side edge of the floor of the building. In addition, in the configuration in which a plurality of cutout grooves are formed along the longitudinal direction of the front end edge of the main plate portion and the ridge, the rattle occurs. When adjusting the height, it is not necessary to cut off the part where the cutout groove is formed, and it is only necessary to cut off the required height of the cutting edge for height adjustment of the part other than the cutout groove. The work efficiency can be improved. Furthermore, the notch groove can provide a water-passing action that allows the flow of rainwater along the joint width direction, thereby preventing the flow of rainwater flowing into the joint from the floor surface.

A first embodiment of a floor joint cover device according to the present invention will be described with reference to FIGS.
In FIG. 1, A is a building having a base-isolated structure whose lower part is supported by a base-isolating device (not shown) having a buffer function, and B is a building made of artificial ground formed around the building A. It is adjacent via the joint s. The joint s is formed with a predetermined width along the periphery of the building A, and can absorb the horizontal fluctuation of the building A and the surrounding building B in the event of an earthquake.

  At the side edge of the floor f2 of the building B, as shown in FIG. 1, a supporting step edge 1 that is recessed at a depth corresponding to the thickness of a cover body C to be described later is provided in the width direction of the joint s (FIG. 1). The front slide receiving frame 2 having a horizontal receiving edge 2a is disposed on the front end ridge of the supporting step edge 1. Further, on the rear end side of the support step edge 1, a second horizontal receiving edge 3c is coupled to the rear end of the first horizontal receiving edge 3a via an inclined receiving edge 3b, and further the second horizontal receiving edge 3c. A rear slide receiving frame 3 is provided at the rear end thereof, which is coupled with an inclined receiving edge 3d inclined upward toward the upper surface of the floor f2. Here, the depth of the second horizontal receiving edge 3c is set to a depth corresponding to the thickness of the front end portion of the main plate portion 5 constituting the cover body C. The front sliding receiving frame 2 and the rear sliding receiving frame 3 are arranged so as to extend in a direction along the joint s (the front-rear direction in FIG. 1), and the length thereof is as shown in FIG. In the state in which a plurality of cover bodies C are arranged, the operating gaps 4 and 4 can be slid in the direction along the joint s to the sides of the cover bodies C and C located at both ends thereof. Is set to the length at which each occurs. The front sliding receiving frame 2 and the rear sliding receiving frame 3 can be integrally formed without being divided as shown.

  A cover body C is passed between the floor f1 of the building A and the floor f2 of the building B to cover the joint s. A plurality of the cover bodies C are continuously arranged in the direction along the joint s (see FIG. 9), and each cover body C has one end as a building as shown in FIG. It is connected to the side edge of the floor A of A through a connecting means 12 described later so as to be swingable. Each cover body C has the other end as a free end, and the free end is slidably mounted on the support step 1.

  As shown in FIGS. 2 and 3, each cover body C has a reinforcing rib composed of a rectangular main plate portion 5 that covers the joint and a plurality of protrusions 7 arranged in a lattice pattern on the lower surface of the main plate portion 5. The main plate portion 5 and the reinforcing rib portion 6 are integrally formed by casting. Of the plurality of ridges 7 constituting the reinforcing rib portion 6, the ridges are provided extending in the direction along the joint s at the rear end portion of the main plate portion 5, the vicinity of the front end, and an intermediate position thereof. Height adjusting cutting allowances 8 (see FIG. 4) are coupled to the lower ends of 7a, 7b, and 7c and the lower surface of the front end edge of the main plate portion 5, respectively. It is in the state which protrudes below rather than the protrusion 7 of this. Further, the ridge 7b arranged in the vicinity of the front end of the main plate portion 5 is connected to the plurality of ridges 7 arranged along the width direction of the joint s so as to be continuous with the ridge 7b. A plurality of inclined end edges 9 that are inclined upward from the lower end of 7b toward the front of the lower surface of the main plate portion 5 are provided.

  Further, as shown in FIGS. 3 and 5, a plurality of notch grooves 10 are formed in the longitudinal direction of the front end edge of the main plate portion 5 and the protrusion 7 a at the front end edge of the main plate portion 5 and the lower portion of the protrusion 7 a. Are formed along. The plurality of cutout grooves 10 can be formed not only at the front edge of the main plate portion 5 and the ridges 7a but also below the ridges 7b and 7c.

  Here, as shown in FIG. 1, the protrusion 7b in the vicinity of the front end has an appropriate width between the inclined end edge 9 and the inclined receiving edge 3b of the rear sliding receiving frame 3 described above. It is mounted on the first horizontal receiving edge 3 a of the rear sliding receiving frame 3, and this gap is used as an operating gap 11. Further, the front end of the main plate portion 5 protruding forward from the ridge 7 b is mounted on the second horizontal receiving edge 3 c of the rear sliding receiving frame 3, and above the working gap 11 by the front end of the main plate portion 5. Is shielded. Further, the protrusion 7c disposed at an intermediate position of the main plate portion 5 is mounted on the horizontal receiving edge 2a of the front sliding receiving frame 2 described above.

The connecting means 12 will be described with reference to FIG.
On the side edge of the floor f1 of the building A, the holding frame 13 is disposed so as to extend in the direction along the joint s. The holding frame 13 is formed in an L-shaped cross section having a horizontal receiving edge 13a and a vertical edge 13b. On the upper surface of the horizontal receiving edge 13a, the lower end of the protrusion 7a disposed on the rear end portion of the main plate portion 5 is mounted, and one end of the cover body C is swingably supported by the lower end. ing. The horizontal receiving edge 13a is provided with a plurality of connecting rods 14 which are inserted from the lower surface side thereof and are made up of bolts fixed to the horizontal receiving edge 13a at predetermined intervals. On the other hand, mounting recesses 15 are integrally formed at the rear end of each cover body C at a plurality of positions corresponding to the connecting rods 14, and vertical insertion holes 16 are formed in the bottom wall of each mounting recess 15. Is provided. Then, in a state where one end of the cover body C is supported by the lower end of the protrusion 7a mounted on the horizontal receiving edge 13a, each of the connecting rods 14 is loosely fitted into the insertion hole 16 of the mounting recess 15 from below. A spring receiving member 17 made of a nut is screwed to the upper end. In addition, a coil spring 18 is externally fitted in a compressed state on each connecting rod 14 so as to be interposed between the spring receiving member 17 and the bottom wall of the mounting recess 15. The cover body C is constantly urged downward by the generated force. As the downward biasing means for the cover body C, a rubber ring (not shown) can be used instead of the coil spring 18. As a result, connecting means 12 for connecting one end of the cover body C in a swingable manner to the side edge of the floor f1 of the building A is constructed. In this connected state, the upper surface of the main plate portion 5 is made to be the same height as the upper surface of the floor f1 of the building A. Further, a shielding cap 19 is detachably fitted in the upper opening of each mounting recess 15.

  In addition, as described above, the cover body C integrally formed by casting has a height position corresponding to the lower surface of the main plate portion 5 having a predetermined thickness, and an alignment position of a mold (not shown) formed vertically. The outer peripheral surface of the main plate portion 5 is an inclined surface 20 that inclines toward the upper inner side by the draft provided in the mold. For this reason, when a plurality of cover bodies C are arranged side by side in the direction along the joint s, the inclined surfaces 20 and 20 between the main plate portions 5 and 5 of the adjacent cover bodies C and C are disposed as shown in FIG. As a result, a gap 21 that expands in an inverted C shape is formed. As a result, even if a level difference occurs between the adjacent cover bodies C, C, the level difference is not conspicuous, and the fit after construction can be clearly shown.

  In addition, an infinite number of anti-slip protrusions 22 (see FIG. 3) having a predetermined shape are integrally formed on the upper surface of the main plate part 5 by casting, and a plurality of horizontal bars 24 are horizontally mounted in the concave grooves 23. The handle portion 25 is provided.

Next, the operation mode of the floor joint cover device having such a configuration will be described.
The cover body C is arranged so that the upper surface of the main plate portion 5 is substantially flush with the upper surface of the floor f1 of the building A and the upper surface of the floor f2 of the building B. As shown in FIG. 3, there is no step between the cover body C and the floor f1 of the building A or the floor f2 of the building B. Further, when the building A and the adjacent building B are relatively displaced relatively in the direction of the earthquake, the free end of the cover body C slides horizontally within the range of the working gap 11 and When the cover body C follows the relative displacement and is further relatively displaced, the inclined end edge 9 formed at the free end of the cover body C abuts on the inclined receiving edge 3b and moves up. As shown in FIG. It is possible to escape from the relative displacement by tilting with the one end connected by the fulcrum as a fulcrum.

  When the building A and the adjacent building B are relatively displaced in the direction away from each other, the cover body C slides horizontally on the support step edge 1 with the free end facing in the opposite direction to the inclined receiving edge 3b. Move to follow the relative displacement.

  When the building A and the building B return to the steady position after the earthquake, the free end of the cover body C also returns to the steady position shown in FIG. 1, and the cover body C is in the steady state. Return to.

  When the building A and the adjacent building B are relatively displaced in the front-rear direction (the direction along the joint s), the free end of the cover body C slides on the support step edge 1 in the front-rear direction. Follow relative displacement. In this case, the lower end of the protrusion 7c slides in the front-rear direction on the horizontal receiving edge 2a of the front sliding receiving frame 2 disposed on the support step edge 1, and the lower end of the protrusion 7b is the support step. It slides in the front-rear direction on the first horizontal receiving edge 3a of the rear sliding receiving frame 3 disposed on the edge 1. Here, as shown in FIG. 9, a plurality of cover bodies C arranged continuously along the joint s are positioned on the sides of the cover bodies C, C located at both ends thereof, Since the operating gaps 4 and 4 are provided at the side end portions of the moving frame 2 and the rear sliding receiving frame 3, it is possible to slide the free ends of the cover bodies C in the front-rear direction by the operating gaps 4 and 4. It has become.

  Further, when the building A and the adjacent building B are relatively displaced in the vertical direction, the cover body C uses the connecting means 12 as a fulcrum at one end connected to the side edge of the floor f1 of the building A. It tilts with the vertical movement of A or the adjacent building B and follows its relative displacement.

  In such a configuration, as described above, the cover body C includes the rectangular main plate portion 5 that covers the joint s, and the reinforcing rib portion 6 that includes the plurality of protrusions 7 disposed on the lower surface of the main plate portion 5. And the main plate portion 5 and the reinforcing rib portion 6 are integrally formed by casting, the lower ends of predetermined protrusions 7a, 7b, 7c constituting the reinforcing rib portion 6, and the front end of the main plate portion 5. In the case where the cast cover body C is rattled by the height adjusting cutting allowance 8 being coupled to the lower surface of the edge, the lower ends of the ridges 7a, 7b, 7c and the main plate The backlash can be eliminated by partially removing the height adjusting cutting allowance 8 coupled to the lower surface of the front edge of the part 5 by a necessary amount to adjust the height. Here, the height adjusting cutting allowance 8 is a cover formed in a flat plate shape by being coupled to the lower ends of the protrusions 7a, 7b, 7c and the lower surface of the front end edge of the main plate portion 5 in a narrow band shape. Compared with the case where the bottom surface of the body C is scraped over a wide range, the scraping operation can be performed easily and quickly.

  Further, the joint edge s is located at a position where the front end edge of the main plate portion 5 and the ridge 7a where the height adjusting cutting margin portion 8 is coupled are in contact with the side edges of the floors f1 and f2 of the buildings A and B, respectively. A plurality of notch grooves 10 are formed at the lower end of the front end edge of the main plate portion 5 and the protrusion 7a, and the longitudinal direction of the front end edge of the main plate portion 5 and the protrusion 7a. Therefore, it is not necessary to cut off the portion where the notch groove 10 is formed when adjusting the height when the play occurs, and the height adjustment cutting allowance of the portion other than the notch groove 10 is not required. Since it is only necessary to scrape the required amount of the part 8, the overall scraping amount can be reduced, and the work efficiency can be improved. Even when the cutout grooves 10 are formed in the lower portions of the protrusions 7b and 7c, the same effect can be obtained. Furthermore, the notch groove 10 can provide a water flow action that allows the flow of rainwater along the width direction of the joint s, thereby inhibiting the flow of rainwater flowing from the floors f1 and f2 into the joint s. There is nothing.

  FIG. 10 shows a second embodiment, in which the floor f2 of the building B adjacent to the building A via the joint s is compared with the height of the floor f1 of the building A. The front slide receiving frame 2 provided with a horizontal receiving edge 2a on the side edge of the floor f2 and the rear sliding receiving frame 26 provided with a relatively long horizontal receiving edge 26a. Is arranged. The rear sliding receiving frame 26 can be divided into front and rear parts. Further, each cover body C which is passed over the joint s between the floor f1 of the building A and the floor f2 of the building B and covers the joint s has one end on the side edge of the floor f1 of the building A. The other end of the free end is slidably mounted on the side edge of the floor f2 of the building B.

  As in the first embodiment, each cover body C includes a rectangular main plate portion 5 that covers the joint, and a reinforcing rib portion 6 that includes a plurality of protrusions 7 arranged in a lattice pattern on the lower surface of the main plate portion 5. The main plate portion 5 and the reinforcing rib portion 6 are integrally formed by casting. Of the plurality of ridges 7 constituting the reinforcing rib portion 6, the ridges are provided extending in the direction along the joint s at the rear end portion of the main plate portion 5, the vicinity of the front end, and an intermediate position thereof. 7a, 7b, and 7c are respectively provided with height adjusting cutting allowances 8 at their lower ends, and the protrusions 7a, 7b, and 7c protrude downward from the other protrusions 7. ing. Further, the main plate portion 5 includes a slope portion 27 inclined downward at the front end thereof, and a height adjusting cutting margin portion 8 is also coupled to the lower end of the slope portion 27. The lower end of the slope portion 27 and the lower end of the ridge 7 b disposed in the vicinity of the front end of the main plate portion 5 are mounted on the horizontal receiving edge 26 a of the rear slide receiving frame 26. The ridge 7c disposed at the intermediate position is mounted on the horizontal receiving edge 2a of the front sliding receiving frame 2 described above.

  A plurality of cutout grooves 10 (see FIG. 5) are formed along the longitudinal direction of the slope portion 27 and the protrusion 7a at the lower end of the slope portion 27 and the lower portion of the protrusion 7a. The plurality of cutout grooves 10 can be formed not only on the slope portion 27 and the protrusion 7a but also on the lower portions of the protrusions 7b and 7c.

  In addition, about the component which is common in 1st Example, the code | symbol same as 1st Example is attached | subjected and duplication description is abbreviate | omitted.

  In the floor joint cover device having such a configuration, the cover body C always covers the joint s at the steady position shown in FIG. When the building A and the adjacent building B are relatively displaced in the earthquake, the free end of the cover body C slides horizontally on the side edge of the floor f2 of the building B. Follow the relative displacement of the lever.

  Further, when the building A and the adjacent building B are relatively displaced in the front-rear direction (the direction along the joint s), the free end of the cover body C extends in the front-rear direction on the side edge of the floor f2 of the building B. Slide to follow the relative displacement. In this case, the lower end of the ridge 7c slides in the front-rear direction on the horizontal receiving edge 2a of the front sliding receiving frame 2 disposed on the side edge of the floor f2, and the lower end of the ridge 7b and the slope The lower end portion of the portion 27 slides in the front-rear direction on the horizontal receiving edge 26a of the rear sliding receiving frame 26 disposed on the side edge of the floor f2.

  Further, when the building A and the adjacent building B are relatively displaced in the vertical direction, the cover body C uses the connecting means 12 as a fulcrum at one end connected to the side edge of the floor f1 of the building A. It tilts with the vertical movement of A or the adjacent building B and follows its relative displacement.

  Even in the second embodiment, the main plate portion 5 and the reinforcing rib portion 6 constituting the cover body C are integrally formed by casting, and predetermined protrusions 7a and 7b constituting the reinforcing rib portion 6 are formed. In the case where the cast cover body C is loose due to the height adjusting cutting margin 8 being coupled to the lower end of the slope 7c and the lower end of the slope portion 27, the ridges 7a, 7b, By removing the height adjusting cutting allowance portion 8 coupled to the lower end of 7c and the lower end of the slope portion 27 by a necessary amount and adjusting the height, the backlash can be eliminated. . Here, the height adjusting cutting allowance 8 is coupled in a narrow band shape, so that the cutting work is performed as compared with the case where the bottom surface of the cover body C formed in a flat plate shape is cut over a wide range. Can be done easily and quickly.

  Further, at the position where the slope portion 27 and the ridge 7a of the main plate portion 5 in which the height adjusting cutting margin portion 8 is coupled are in contact with the side edges of the floors f1 and f2 of the buildings A and B, respectively. s extending in the direction along s, and a plurality of notch grooves 10 are formed below the slope portion 27 and the protrusion 7a of the main plate portion 5, and the slope portion 27 and the protrusion 7a of the main plate portion 5. By adjusting the height along the longitudinal direction, it is not necessary to scrape off the portion where the notch groove 10 is formed when adjusting the height when the play occurs, and the height adjustment of the portion other than the notch groove 10 is performed. Since it is sufficient to cut the required amount of the cutting allowance 8, the amount of cutting can be reduced as a whole, and the work efficiency can be improved. Even when the cutout grooves 10 are formed in the lower portions of the protrusions 7b and 7c, the same effect can be obtained. Furthermore, the notch groove 10 can provide a water flow action that allows the flow of rainwater along the width direction of the joint s, thereby inhibiting the flow of rainwater flowing from the floors f1 and f2 into the joint s. There is nothing.

  In each of the above-described embodiments, the building A is a seismic isolation structure and the building B is a structure made of artificial ground. Instead, the structure A is a structure made of artificial ground. The object B may be a seismically isolated structure. Moreover, the floor joint cover device according to the present invention can be applied to a general building other than a seismic isolation structure whose lower part is supported by the seismic isolation device.

It is a longitudinal front view which shows the construction state of the joint cover apparatus for floors concerning a 1st Example. It is a vertical front view of the cover body C which comprises the floor joint cover apparatus same as the above. It is explanatory drawing of the cover body C same as the above which made the top half a top view and made the bottom half the bottom view. It is an expanded sectional view of the principal part. It is a side view of the cover body C same as the above. It is an enlarged view of the connection means 12 part. It is explanatory drawing which shows the shape of the clearance gap formed between adjacent cover bodies C and C. FIG. FIG. 6 is an operation explanatory diagram of a cover body C. It is a top view which shows the state which has arrange | positioned the several cover body C continuously in the direction in alignment with the joint s. It is a vertical front view which shows the construction state of the joint cover apparatus for floors concerning a 2nd Example. (A) is a schematic longitudinal front view of a floor joint cover device having a conventional structure, and (B) is an operation explanatory view thereof.

Explanation of symbols

A building B building C cover body f1 floor f2 floor s joint 5 main plate part 6 reinforcing rib part 7, 7a, 7b, 7c ridge 8 cutting allowance part 10 for height adjustment notch groove 12 connecting means

Claims (1)

One end of a cover body that is passed over a joint between floors of adjacent buildings and covers the joint is swingably connected to a side edge of one floor via a connecting means. In the floor joint cover device in which the other end is a free end and the free end is slidably mounted on the side edge of the other floor,
The cover body includes a rectangular main plate portion that covers the joint, and reinforcing rib portions including a plurality of protrusions disposed on the lower surface of the main plate portion, and the main plate portion and the reinforcing rib portion are formed by casting. It is integrally formed, and a height adjusting cutting margin is coupled to the lower surface of the front edge of the main plate portion and the lower end of the predetermined ridge constituting the reinforcing rib portion ,
At the position where the front edge and the ridge of the main plate portion where the height adjustment cutting allowances are coupled are in contact with the side edge of the floor of the building, the height adjustment cutting portion extends in the direction along the joint, and is disposed. A floor joint cover device , wherein a plurality of cutout grooves are formed along the longitudinal direction of the front end edge of the main plate portion and the ridges at the front end edge of the main plate portion and the lower portions of the ridges .

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