JP7396723B1 - joint device - Google Patents

Abstract

[Problem] To provide a joint device that can close joints on floors and walls so that they do not open without impairing aesthetic appearance, and can absorb shaking motion during an earthquake without damaging joint plates or a building frame. . [Solution] A floor joint cover device 5 that closes a joint 2 between the floor surfaces of one frame 3 and the other frame 4, and a joint 2 between the wall surfaces of the one frame 3 and the other frame 4. A joint device consisting of a wall joint cover device 6 for closing, the wall joint cover device 6 having one end attached to the one frame 3, the other end attached to the other frame 4, and the wall joint cover device 6 having one end attached to the other frame 4, A wall joint cover 26 is expandable and retractable following the displacement of the width of the joint 2 between walls, and a lower end of the wall joint cover 26 is arranged such that the lower end substantially contacts the upper surface of the floor joint cover device 5. and a lower cover 27 which is provided near the wall and is expandable and retractable following the displacement of the width of the joint 2 between the wall surfaces. [Selection diagram] Figure 1

Description

The present invention relates to a joint device that closes a joint between left and right building blocks provided through a joint.

Conventionally, as a joint device for closing the joints in the floor part and the wall part between one building block and the other building block, "one building block forming a joint part having a corner, The other frame that is provided through the joint part and faces the one frame, the floor joint plate support provided on the other frame, and the side that faces the floor joint plate support. and a floor joint plate slide support part provided on the one frame, one end of which is slidably supported in the left-right direction by the floor joint plate support part, and the floor joint plate slide support part is supported by the floor joint plate slide support part. a floor joint plate whose other end is slidably supported in the front-rear direction; and a wall surface located above one end of the floor joint plate and provided between the wall surfaces of the one frame and the other frame. The wall joint device is provided on one side wall surface of one of the building blocks and on one side wall surface of the other building block opposite to this one side wall surface, and has a plurality of pivot parts. a link member having a link member, a plurality of bar members respectively attached to the plurality of pivot portions of the link member, and a plurality of bar members fixed to the bar member, the lower end of which is positioned above the floor joint plate at a predetermined distance. a plurality of wall joint plates; and a plurality of auxiliary plates, each of which is provided at the lower end of the plurality of wall joint plates so as to be slidable in the vertical direction, and whose lower end abuts the floor joint plate. A "joint device consisting of a joint device" is known (Patent Document 1).

However, with such a joint device, when closing the joint between the walls on the long side of the floor joint plate, the floor joint plate, wall joint plate, auxiliary plate, etc. may be damaged due to the rise of the floor joint plate. There was a risk that In other words, when a floor joint plate rises, the auxiliary plate installed in the area where the floor joint plate was originally placed will rise upward in line with the rise of the floor joint plate, but the floor joint plate will The auxiliary plate of the wall joint plate that is installed on the other side of the frame does not rise upwards from the other end of the plate (the end that rises), and the other end of the floor joint plate is the auxiliary plate. There was a risk of collision and damage.

Japanese Patent Application Publication No. 2017-214700

In view of the above-mentioned drawbacks of the conventional art, the present invention is capable of sealing the joints of floors and walls to prevent them from opening without impairing the aesthetics, and also absorbs shaking motion during an earthquake without damaging the joint plates or the building frame. The purpose of the present invention is to provide a joint device that can perform

These and other objects and novel features of the present invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are solely for illustrative purposes and do not limit the technical scope of the present invention.

In order to achieve the above object, the joint device according to claim 1 of the present invention includes a floor joint cover device that closes the joint between the floor surfaces of one of the building blocks and the other of the building blocks; A joint device comprising a wall joint cover device for closing a joint between walls of the other building frame, wherein the wall joint cover device has one end attached to the one building frame and the other end attached to the other building frame. a joint cover for a wall surface to which a portion is attached and is expandable and retractable in accordance with the displacement of the width of the joint portion between the wall surfaces; and a lower cover that is provided near the lower end of the wall and is expandable and retractable following the displacement of the width of the joint between the wall surfaces, and the wall joint cover has one end attached to the one of the building blocks. a link member having a plurality of pivot parts, the other end of which is attached to the other frame; and a plurality of wall joint cover bodies attached to the pivot parts of the link member via connection members. , a cover plate provided near the lower end of the wall joint cover main body so as to be slidable in the vertical direction, the lower end of which substantially abuts the lower cover; It is characterized in that it is attached to the other frame so as to be movable in the vertical direction, and the other end is attached to the other frame so as to be movable in the vertical direction.

The lower cover of the joint device according to claim 2 is configured by connecting a plurality of lower cover main bodies each having a substantially downward U-shape when viewed in cross section, and the lower end portion of the lower cover is connected to the downward U-shaped portion. Characterized by penetrating.

The floor joint cover device of the joint device according to claim 3 includes a joint cover support device having one end attached to one frame and the other end attached to the other frame, and a joint cover support device having one end attached to the one frame. a movable joint cover whose bottom part is supported and whose bottom part at the other end is supported by the joint cover support device; and a movable joint cover whose one end part is attached to the other frame and on which the movable joint cover rides on the other end . and a fixed joint cover whose bottom part at the other end is supported by the joint cover support device, and the joint cover support device is provided so as to span the one frame and the other frame. , consisting of a support beam that can be expanded and contracted in the width direction of the joint between the floor surfaces, and a support member that is provided on the support beam and supports the bottom of the movable joint cover and the fixed joint cover on the other end side, The receiving member is formed to a length that prevents the joint between the floors from opening when the joint between the floors widens due to an earthquake and the movable joint cover and the fixed joint cover are separated. It is characterized by

As is clear from the above description, the present invention provides the following effects.
(1) In the invention described in claim 1, since the lower cover is movable in the vertical direction and expands and contracts, when the floor joint cover is displaced, the lower cover can be collectively displaced in the vertical direction, and it is possible to reliably prevent the floor joint cover device from colliding with the wall joint cover device or the like.
(2) Since there is no need to use a sealing member such as resin, it is possible to prevent the appearance from being impaired.
(3) In the invention according to claim 2, the same effects as those in (1) and (2) can be obtained, and since the cover plate fits into the recessed part of the lower cover, the lower cover and the cover plate are more closely connected to each other. can be operated in an integrated manner.
(3) In the invention according to claim 3, the same effects as those in (1) to (3) above can be obtained, and also heavy objects such as vehicles can be allowed to pass.

1 to 9 are explanatory diagrams showing a first embodiment of the present invention.
10 and 11 are explanatory diagrams showing a second embodiment of the present invention.
FIG. 1 is a plan view of a floor joint device according to a first embodiment. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. A sectional view taken along line 3-3 in FIG. 1. Explanatory diagram of a movable joint cover and a fixed joint cover. An explanatory diagram of a wall joint cover main body and a cover plate. An explanatory diagram of the lower cover. FIG. 7 is a sectional view taken along line 7-7 in FIG. 6; An explanatory diagram of the operation when the joint is narrowed due to an earthquake. An explanatory diagram of the operation in a state where the joint area has become wider due to an earthquake. FIG. 7 is a plan view of a floor joint device according to a second embodiment. 11 is a sectional view taken along line 11-11 in FIG. 10. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments for carrying out the invention shown in the drawings. Note that in this specification, the direction is referred to as the left-right direction and the front (lower part of the drawing) and rear (upper part of the drawing) direction with reference to FIG. Also, with reference to FIG. 2, it is referred to as an upward direction (upward direction in the drawing) and downward direction (downward direction in the drawing direction).

Furthermore, in the present invention, a frame refers to a structure such as a building, a road, a slab, an elevator shaft, etc., in which joint plates can be installed, and an entrance means not only a door or an entrance with a door, but also a building where people, vehicles, etc. It also includes passages that can be passed through.

In a first embodiment of the present invention shown in FIGS. 1 to 9, reference numeral 1 denotes a joint device that closes a joint 2 between one frame 3 and the other frame 4.

As shown in FIGS. 1 to 3, for example, this joint device 1 includes a floor joint cover device 5 that covers a joint 2a between the floor surfaces of one of the building blocks 3 and the other of the building blocks 4, and The wall joint cover device 6 covers the joint portion 2b between the walls of the other frame 4.

As shown in FIGS. 1 to 3, this floor joint cover device 5 includes a joint cover support device 7 having one end attached to one frame 3 and the other end attached to the other frame 4; A movable joint cover 8 has one end supported by one frame 3 and the bottom of the other end supported by the joint cover support device 7, and a movable joint cover 8 having one end attached to the other frame 4 and the other end supported by the joint cover supporting device 7. A sloped surface 9 on which the movable joint cover 8 rides is formed, and a fixed joint cover 10 is supported at the bottom of the other end by the joint cover support device 7.

First, a joint cover support device 7 is provided in the joint portion 2a between the floor surfaces of one frame 3 and the other frame 4 so as to span the joint. In this embodiment, this joint cover support device 7 has one end attached to one body 3 so as to be rotatable in the front-back direction, and the other end attached to the other body so as to be rotatable in the front-rear direction. a plurality of support beams 11 that can be expanded and contracted in the direction (width direction of the joint portion); and a support member that is provided on the support beams 11 and supports the bottom of the other end of the movable joint cover 8 and the fixed joint cover 10. It consists of 12.

In this embodiment, the support beam 11 is a support beam main body that includes guide rails 13 provided on the walls of the left and right frames 3 and 4, and rolling members 14 such as rollers that engage with the guide rails 13 at both ends. It consists of 15. This support beam main body 15 spans the joint 2a between floors diagonally in plan view, and when the joint 2 becomes wider or narrower due to an earthquake, the rolling members 14 at both ends It moves in the front-back direction along the guide rail 13 and follows the width of the joint part 2. A substantially central portion of the receiving member 12 is pivotally attached to the substantially central portion of the receiving beam main body 15 with a pin or the like (not shown). Thereby, even if the width of the joint changes, the receiving member 12 can always be positioned approximately at the center of the joint.

In addition, the receiving beam includes one square pipe-shaped arm member whose one end is rotatably attached to one frame 3 in the front-back direction, and one arm member whose one end is rotatably attached to the other frame 4 and the other arm member. It is also possible to use a configuration in which the other arm member has a rectangular pipe shape and whose end portion is connected to the other end portion of the one arm member in an inserted state. In such a case, one arm member may have a large diameter and the other end of the other arm member may be inserted into the other end of one arm member, or the other arm member may have a large diameter and the other end may be inserted into the other end of the other arm member. The other end of one arm member may be inserted into the other end of the arm member, or these may be mixed.

The receiving member 12 is a plate-shaped member provided near the approximate center of the receiving beam 11, and supports the other end sides of the movable joint cover 8 and the fixed joint cover 10 on its upper surface. Furthermore, even if the joint 2a between the floors becomes wider due to an earthquake, the joint 2a between the floors will not open if the movable joint cover 8 and the fixed joint cover 10 are separated. The length is such that it can support the other ends of the movable joint cover 8 and the fixed joint cover 10. Note that any member may be used as the receiving member 12 as long as it supports the bottom of the other end of the movable joint cover 8 and the fixed joint cover 10 and prevents the joint portion 2a from opening. For example, a grid-like member, a wire mesh, etc. can also be used. Here, "the joint 2a does not open" means that there is no large gap that would allow a person to fall into the joint 2a, and for example, a small through hole is created in consideration of the ventilation of the joint 2a. The receiving member 12 may be used, or a wire mesh or lattice member as described above may be used.

The movable joint cover 8 includes a movable joint cover main body 17 that has a rectangular shallow dish shape in plan view and has a pair of locking stakes 16 at both ends of one end, and a movable joint cover main body 17 filled with mortar, concrete, etc. A filling member 18 , a decorative board 19 made of tiles such as marble or bricks affixed to the upper surface of this filling member 18 , and a hinge member 20 provided on the other end side of the movable joint cover body 17 . It is composed of a cover plate 21. One frame 3 is provided with a movable joint cover support part 23 that supports one end of the movable joint cover 8 and includes a locking pile insertion hole 22 into which the locking pile 16 is inserted. Note that the locking stake 16 is desirably formed to a length that will not fall off even if the movable joint cover 8 rides on the upper surface of the fixed joint cover 10.

The fixed joint cover 10 includes a fixed joint cover main body 24 which is rectangular in plan view and has a shallow dish shape, a filling member 18 such as mortar or concrete filled into the fixed joint cover main body 24, and a filling member 18 pasted on the upper surface of the filling member 18. It is formed on the other end side of the fixed joint cover main body 24 and the attached decorative board 19 made of tiles such as marble or bricks, and the other end of the movable joint cover 8 runs over when the joint part 2 becomes narrow. It is composed of an inclined surface 9. The fixed joint cover 10 may be attached at one end in a locked state with a locking stake 16 similarly to the movable joint cover 8, but in this embodiment, the fixed joint cover support part provided on the other frame 4 At 25, one end side of the fixed joint cover 10 is fixedly attached with bolts or the like.

It is desirable that the other ends of the movable joint cover 8 and the fixed joint cover 10 are provided close to each other so that they are almost in contact with each other under normal conditions. Any arrangement may be used as long as it is suitable.

In this embodiment, as shown in FIGS. 1 to 3, the wall joint cover device 6 has one end attached to one frame 3, the other end attached to the other frame 4, and is connected between the walls. a wall joint cover 26 that is expandable and retractable following the displacement of the width of the joint portion 2b; and a lower end portion of the wall joint cover 26 such that the lower end substantially contacts the upper surface of the floor joint cover device 5. and a lower cover 27 which is provided in the wall and is expandable and retractable following the displacement of the width of the joint 2b between the wall surfaces.

In this embodiment, the wall joint cover 26 includes a plurality of pivot parts 28, one end of which is attached to one frame 3 and the other end of which is attached to the other frame 4, as shown in FIG. , a plurality of wall joint cover bodies 31 attached to the pivot portion 28 of the link member 29 via the connecting member 30, and a plurality of wall joint cover bodies 31 attached vertically near the lower end of the wall joint cover body 31. The cover plate 32 is provided so as to be slidable in the direction, and a cover plate 32 whose lower end portion substantially contacts the lower cover 27.

The link members 29 are pantograph-shaped members, and a plurality of link members 29 (in this embodiment, two link members 29) are provided above and below. The link member 29 has one end attached to one body 3 so as to be rotatable in the front-rear direction via a rotation axis 33 such as a hinge, and the other end attached to the other body 4 via a rotation axis 33 such as a hinge. It is provided so as to be rotatable in the front-back direction via the. Moreover, a wall joint cover main body 31 is attached to the plurality of pivot parts 28 via connection members 30. In this embodiment, the link member 29 is provided so as to be inclined in plan view, but it may be provided so as to be parallel to the longitudinal direction (horizontal direction) of the movable joint cover 8 and the fixed joint cover 10. .

The wall joint cover main body 31 is a metal plate material formed into a substantially crank shape or a substantially hat steel shape when viewed from above, and has a mounting portion 34 attached to the link member 29 at one end thereof. A bar member such as a rafter may be fixed to this attachment portion 34 as appropriate.

Further, the wall joint cover main body 31 is provided with cover plate attachment portions 35 to which the cover plates 32 are attached in an inserted state so as to be movable in the vertical direction. This cover plate attachment part 35 may have any structure as long as it guides the cover plate 32 so that it moves only in a substantially vertical direction. In this embodiment, when the cover plate 32 moves up and down, The protruding end of the wall joint cover main body 31 is folded back to serve as a guide to form a cover plate attachment part 35. For example, a plate material or the like is fixed at a position facing this cover plate attachment part 35 to form a pair of guides. The cover plate mounting portion 35 may also be a section-shaped cover plate mounting portion 35 . In addition, a guide such as a groove or a guide rail is formed on the back surface of the wall joint cover main body 31 (the surface that the cover plate 32 comes into contact with), and an engaging part that engages with this groove is formed on the cover plate 32 to act as a guide. The cover plate mounting portion 35 may be formed by engaging the engaging portion.

In this embodiment, as shown in FIGS. 6 and 7, the lower cover 27 is constructed by connecting a plurality of lower cover bodies 36, which are substantially downwardly U-shaped in cross-sectional view, in an engaged state like a nested structure. has been done. Specifically, as shown in FIG. 7, there is a first vertical portion 36b formed substantially vertically with a folded portion 36a formed at the upper end portion, and a substantially horizontal portion provided substantially perpendicular to the first vertical portion 36b. , a second vertical portion 36d provided approximately at right angles to the bottom portion 36c, and a second folded portion 36e formed at the upper end of the second vertical portion. By inserting the lower cover main body 36, which is slightly smaller in size, into the folded parts 36a and 36e in a nested manner, it can be expanded and contracted in the left-right direction (width direction of the joint part). Note that, although not shown, a drop-off prevention means for preventing the lower cover main body 36 from falling off (the connection is released) from the folded portions 36a and 36e is provided as appropriate. Further, the dimensions of the first vertical portion and the second vertical portion may be approximately the same, or one of them may be longer. Furthermore, in the present embodiment, the lower cover main body 36 is shaped as described above, but it has a shape that can be expanded and contracted in the left and right directions and that allows the bottom of the cover plate 32 to be pushed up integrally, for example, a substantially L-shaped cross section, or a substantially L-shaped cross section. It can be formed into any shape such as a hat steel shape or an arc shape.

One end of the lower cover 27 is attached to the one frame 3 so as to be movable in the vertical direction, and the other end is attached to the other frame 4 so as to be movable in the vertical direction. Specifically, in this embodiment, the lower cover body 36A on one side of the frame 3, the middle lower cover body 36B, and the lower cover body 36C on the other frame side. Bar-shaped lower covers are fixed to one frame 3 and the other frame 4 to lower cover mounting portions 37 having through holes 37a formed at the ends of the main body 36A and the lower cover body 36C on the other frame side, respectively. Insert the fixture 38 and attach the lower cover 27. Note that it is desirable to provide a drop-off prevention means to prevent the lower cover attachment 38 from falling off. Note that it is desirable that the diameter of the through hole 37a formed in the lower cover attachment portion 37 is larger than the diameter of the lower cover attachment, and by forming it in this way, the lower cover 27 can be smoothly moved in the vertical direction. be able to.

By the way, in this embodiment, the downward U-shaped concave portion of the lower cover 27 serves as a cover plate storage portion 39 into which the cover plate 32 is inserted, and it is not necessary to provide such a cover plate storage portion 39. Therefore, when the lower cover 27 moves in the vertical direction, its movement with the cover plate 32 can be smoothly linked.

The length of the cover plate 32 can be set to any length as long as the sliding width of the cover plate 32 is greater than the height at which the movable joint cover 8 rises. In this case, the length stored in the cover board storage part 39 is 100 mm, the sliding width is 150 mm (thickness and margin of the movable joint cover 8), and the part guided by the wall joint cover main body 31 is about 100 mm, that is, the length It is desirable to form it to about 400 mm. Although the cover plate 32 is a flat member in this embodiment, the cover plate 32 may be made of a plate material having a bent portion or a curved portion, such as a plate material having an L-shape (angle shape) in plan view. You can.

The lower cover 27 has a plurality of substantially downward U-shaped lower cover bodies 36 connected in an engaged state like a nested structure when viewed in cross section, so that even if the width of the joint portion 2 changes due to an earthquake, , the overlapping width of the plurality of lower cover bodies 36 can be changed to follow changes in the joints in the left and right direction, and furthermore, as described above, one frame 3 can be attached to the lower cover attachment part 37 having the through hole 37a. Since the bar-shaped lower cover fixture 38 fixed to the other frame 4 is inserted and attached to one frame 3 and the other frame 4, it can be attached to the left and right frames 3 and 4 in different front and rear directions. can also be followed.

Furthermore, since the plurality of lower cover bodies 36 are engaged like a nested structure, even if a part of the lower cover bodies 36 is pushed up by the movable joint cover 8, the lower cover 27 is Since they are pushed upward together, it is possible to prevent the movable joint cover 8 and the like from colliding with the cover plate 32 and the like.

Note that the lower cover 27 may engage a plurality of lower cover bodies 36 in a nested structure as in this embodiment, but for example, a rail-shaped engaging portion and an engaged portion may be formed so that the lower cover bodies 36 are engaged with each other. They may be connected so as to be slidable in the left and right direction.

Incidentally, in this embodiment, the lower cover 27 is attached to the floor surface of one of the building blocks 3 and the other of the building blocks 4, but both ends of the lower cover 27 are attached to the wall surface on the joint side of one of the building blocks 3 and the other building body 4. It can also be attached to other arbitrary parts.

When the left and right building blocks 3 and 4 shake so that the joint 2 narrows due to an earthquake, the other end of the movable joint cover moves upward along the sloped surface 9 formed on the fixed joint cover 10, as shown in FIG. and push up the bottom of the lower cover 27. Then, the lower cover 27 presses each of the plurality of cover plates 32 upward, and moves the cover plates 32 upward. Further, in the wall joint cover device 6, the wall joint cover bodies 31 overlap each other and are displaced so that the width becomes larger, so that the wall joint cover 26 shrinks and absorbs the swinging movement. This action absorbs the shaking motion caused by the earthquake without damaging the building blocks 3 and 4, the floor joint cover device 5, and the wall joint cover device 6.

When the left and right building blocks 3 and 4 shake so that the joint part 2 becomes wider due to an earthquake, the movable joint cover 8 and the fixed joint cover 10 move apart as shown in FIG. 9 to absorb the shaking movement. At this time, the receiving member 12 can prevent the joint portion 2a from opening. Further, in the wall joint cover device 6, the wall joint cover bodies 31 overlap each other and are displaced so that the width thereof is reduced, so that the wall joint cover 26 expands and absorbs the shaking motion.

When the left and right building blocks 3 and 4 shake in different front and back directions due to an earthquake, the movable joint cover 8 and the fixed joint cover 10 move in the front and rear directions in sync with one building block 3 and the other building block 4, respectively, and The joint cover device 6 and the lower cover 27 rotate in the front-back direction to absorb the shaking motion caused by the earthquake.

[Different forms for carrying out the invention]
Next, different embodiments for implementing the present invention shown in FIGS. 10 and 11 will be explained. In addition, in describing these different embodiments for carrying out the present invention, the same components as those in the first embodiment for carrying out the present invention are given the same reference numerals and redundant explanations will be omitted.

In the second embodiment of the present invention shown in FIGS. 10 and 11, the main difference from the first embodiment of the present invention is that links provided at joints between floors. The joint device 1A uses such a floor joint cover device 5A in that it is a floor joint cover device 5A in which a plate-shaped joint cover plate 40 is attached to the member 29 and the pivot portion 28 of the link member 29, respectively. Even in this case, the same effects as in the first embodiment of the present invention can be obtained. In this embodiment, the joint cover plate 40 is not displaced upward, but when the width of the joint part is displaced due to an earthquake, the overlapping width of the joint cover plate 40 of the floor joint cover device changes, and the width of the joint cover plate 40 changes. Collision between the end portion and the wall joint cover 26 can be prevented.

In the embodiments of the present invention, a floor joint cover device using a fixed joint cover and a movable joint cover, and a floor joint cover device using a plurality of joint covers attached via link members are described. Although described, other known floor joint cover devices may be used.

The present invention finds use in the industry of manufacturing floor joint devices.

1, 1A: Floor joint device, 2: Joint part,
3: One body, 4: The other body,
5, 5A: Floor joint cover device, 6: Wall joint cover device,
7: Joint cover support device, 8: Movable joint cover,
9: Rising slope, 10: Fixed joint cover,
11: Reception beam, 12: Reception member,
13: Guide rail, 14: Rolling member,
15: Support beam body, 16: Locking pile,
17: Movable joint cover body, 18: Filling member,
19: Decorative board, 20: Hinge member,
21: Cover plate, 22: Locking pile insertion hole,
23: Movable joint cover support part, 24: Fixed joint cover body,
25: Fixed joint cover support part, 26: Wall joint cover,
27: Lower cover, 28: Pivot part,
29: Link member, 30: Connection member,
31: Wall joint cover body, 32: Cover plate,
33: Rotation axis, 34: Mounting part,
35: Cover plate attachment part, 36: Lower cover body,
37: Lower cover mounting part, 38: Lower cover mounting tool,
39: Cover board storage section, 40: Joint cover board.

Claims (3)

A joint device comprising: a floor joint cover device that closes a joint between the floor surfaces of one frame and the other frame; and a wall joint cover device that closes the joint between the wall surfaces of the one frame and the other frame. There it is,
The wall joint cover device has one end attached to the one frame, the other end attached to the other frame, and is expandable and contractible in accordance with the displacement of the width of the joint between the walls. A joint cover is provided near the lower end of the wall joint cover so that the lower end substantially contacts the upper surface of the floor joint cover device, and is configured to follow the displacement of the width of the joint between the wall surfaces. Consists of a retractable bottom cover and
The wall joint cover includes a link member having a plurality of pivot parts with one end attached to the one frame and the other end attached to the other frame, and connected to the pivot part of the link member. A plurality of wall joint cover bodies are attached via members, and a cover is provided so as to be slidable in the vertical direction near the lower end of the wall joint cover body, and whose lower end substantially abuts the lower cover. Consists of a board and
The lower cover is a joint device in which one end portion is attached to the one body frame so as to be movable in the vertical direction, and the other end portion is attached to the other body body so as to be movable in the vertical direction. 1 . The lower cover is configured by connecting a plurality of lower cover main bodies each having a substantially downward U-shape when viewed in cross section, and a lower end portion of the lower cover enters into the downward U-shaped portion. 10 . The joint device described in . The floor joint cover device includes a joint cover support device having one end attached to one frame and the other end attached to the other frame, and a joint cover support device having one end supported by the one frame and the other end. a movable joint cover whose bottom part is supported by the joint cover support device, one end part of which is attached to the other frame, a slope surface on which the movable joint cover rides is formed at the other end, and a bottom part of the other end part. and a fixed joint cover supported by the joint cover support device,
The joint cover support device is provided so as to span the one frame and the other frame, and includes a support beam that is expandable and retractable in the width direction of the joint between the floors, and a support beam that is provided on the support beam and that is movable. It is composed of a joint cover and a receiving member that supports the bottom of the other end of the fixed joint cover. 3. The joint device according to claim 1, wherein the joint device is formed to have a length such that the joint portion between the floor surfaces does not open when the floor surfaces are separated.

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