JP3148136U - Floor surface temporary installation device - Google Patents

Abstract

The present invention provides a temporary floor device in a groove that can easily and quickly perform temporary work on a temporary floor surface temporarily installed in a groove such as a side groove of a road. A floor surface temporary installation device in a groove includes at least one of a flat floor surface portion fitted in the groove so as to close a width direction on an upper open side of the groove, and left and right edges of the floor surface portion. A floor surface member having a side surface portion extending downward along the both side walls of the groove from the portion, and a pressing nut provided on each of the left and right side surface portions And a pressure welding bolt that is screwed so as to abut against the side wall of the groove vertically. In addition, a plurality of support members that support the floor member at a desired height position from the groove bottom are detachably provided. [Selection] Figure 5

Description

The present invention relates to a temporary floor surface installation device in a groove that installs a temporary floor surface at a desired height position from the bottom surface of the groove, such as a side groove of a road.

In an existing groove (hereinafter also referred to as an existing groove), for example, a side groove of a road, the side wall upper edge (hereinafter also referred to as an upper edge) side of the groove hitting the road shoulder is easily damaged, Depending on the degree of breakage, the cover plate (concrete plate, metal plate, metal net plate, etc.) will not fit well, and the cover plate will become more loose and damage will increase rapidly or generate noise. The repair work of removing the upper edge portion side of one or both side walls of the groove or newly constructing the side wall of the removed portion is appropriately performed.

Also, recently, from the viewpoint of so-called barrier-free that eliminates the step between the road surface and the ground across the side groove, the upper edge of the existing groove is cut and removed, and the height of the side wall of the groove is reduced. However, the number of repair works that cover the side groove cover plate after it has been lowered is increasing rapidly.

On the other hand, in such a conventional construction method, it becomes work in a groove with a relatively narrow width and a small work space, and additional work such as stopping the water flow of the groove or providing a detour of the water flow can be performed. It was necessary and required a lot of work date and time, and it was impossible to improve the work efficiency.

  The present invention eliminates the above problems and eliminates the need for incidental work such as stopping running water or providing a detour, so that the temporary work of the temporary floor surface temporarily installed in the groove can be carried out easily and quickly in the groove. The purpose is to provide a floor surface temporary installation device.

  The invention of a temporary floor device in a groove according to claim 1 includes at least an edge of each of a flat floor surface portion fitted in the groove so as to close a width direction on the upper open side of the groove and both left and right edges of the floor surface portion. A floor member (having a substantially U-shaped cross section) having a side surface portion extending downward from both sides along both side walls of the groove, and a press-contacting nut portion provided on each of the left and right side surface portions And a press-fitting bolt that is screwed into a vertical contact with the side wall of the groove.

  The invention of claim 2 is characterized in that, in the in-groove floor surface temporary device according to claim 1, the tip of each pressure welding bolt is provided with an abutting surface portion in surface contact with the abutting side wall.

  The invention according to claim 3 is the temporary floor surface installation device according to claim 2, wherein the abutting surface portion is a concave-convex surface where the surface in surface contact with the side wall increases the frictional resistance with the surface of the side wall. And

  According to a fourth aspect of the present invention, in the grooved floor surface temporary installation device according to the second or third aspect, the contact surface portion is universally jointed to the tip of the pressure welding bolt.

  The invention of claim 5 is the temporary floor surface installation device according to any one of claims 1 to 4, wherein the female screw hole provided between both side surfaces is a pair in which the central axes of the female screw holes coincide with each other. It is characterized by being provided relative to each other.

The invention of claim 6 is characterized in that in the grooved floor surface temporary installation device according to claim 5, a plurality of pairs of female screw holes are provided.

The invention of claim 7 is a temporary installation device for a floor surface in a groove according to any one of claims 1 to 6, wherein a screwdriver for turning a pressure welding bolt is operably penetrated into the floor surface portion. A hole is provided for each pressure welding bolt.

The invention of claim 8 is the temporary floor installation device in the groove according to any one of claims 1 to 7, wherein a plurality of support members for supporting the floor member at a desired height position from the groove bottom can be freely attached and detached. It is prepared for.

  The invention of claim 9 is characterized in that in the grooved floor surface temporary installation device according to claim 8, the support member is configured to be adjustable in height.

  The invention of claim 10 is the temporary floor device in a groove according to claim 8 or claim 9, wherein the support member is screwed into the support nut portion provided on the floor member side, and the support nut portion. It is characterized in that it is made up of a bolt for a post.

  The invention of claim 11 is characterized in that, in the in-groove floor surface temporary device according to claim 10, the support nut portion is provided on the inner surface side of the side surface portion extending downward from the floor surface portion.

  The invention of claim 12 is the temporary floor installation device in the groove according to claim 10 or claim 11, wherein the support bolt is a support nut from above the floor via a support bolt insertion hole drilled in the floor. It is characterized by being screwed into the part.

  In a thirteenth aspect of the invention, in the in-groove floor surface temporary device according to any one of the first to twelfth aspects, the floor surface portion is composed of a pair of one-side floor surface portions in which the floor surface portion is divided into two in the width direction. It is characterized by that.

  The invention of claim 14 is characterized in that in the in-groove floor surface temporary device of claim 13, the floor surface is connected to a pair of one-side floor surface portions through a plurality of connecting members so that the two-divided intervals can be adjusted. .

The invention of claim 15 is the temporary floor installation device in the groove according to claim 13 or claim 14, wherein the connecting member is a contact member addressed over both rear surfaces of the pair of one-side floor surfaces, and a two-divided interval. A slit provided in the abutting member so as to extend in the enlargement / reduction direction, a screw rod portion planted on each back side of the pair of one-side floor surface portions so as to penetrate the slit, and the screw And a tightening nut portion that is screwed to the rod portion and press-fixes the contact member to the back surface side of the one-side floor surface portion.

  The invention of claim 16 is characterized in that, in the in-groove floor surface temporary device according to claim 15, the slits provided in the contact member are provided independently for each of the back surfaces of the pair of one-side floor surfaces. .

  The invention of claim 17 is that in the grooved floor surface temporary installation device according to claim 15 or claim 16, a plurality of screw rod portions to be implanted on each back surface side of the pair of one side floor surface portions are arranged in parallel. Features.

  According to each of the first to seventeenth aspects, the temporary floor surface can be easily and quickly temporarily installed in the groove at any height position from the groove bottom. Ancillary work such as stopping the work or providing a detour is unnecessary.

  According to the inventions of claims 1 to 17, in any case, even if the groove bottom is not flat and there are irregularities, it is possible to use a pressure welding bolt and a pressure welding nut, or By adjusting the height of the bolt, the temporary floor can be easily set in the groove without being affected by the structure and environment of the groove bottom.

  According to the second and third aspects of the present invention, the frictional resistance with both side walls can be increased by the pair of contact surface portions, and the pressure contact force (stretching force) by the pressure contact bolt is further increased. Can be secured, and the effect of preventing the temporary floor from falling off can be enhanced.

  According to the fourth aspect of the present invention, since the contact surface portion is pressed in accordance with the inclination of the side wall, the frictional friction is further increased depending on the situation of the side wall of the groove regardless of whether the side wall is a vertical surface or an inclined surface. Resistance can be increased.

  According to the fifth aspect of the present invention, it is possible to effectively exert the pressure contact force (stretching force) by the pair of pressure contact bolts whose axes coincide with each other, and it is possible to enhance the effect of preventing the temporary floor surface from falling off.

  According to the seventh and twelfth aspects of the present invention, the tool can be inserted from the floor surface through the insertion hole, so that the bolting or loosening work for pressure contact or support can be easily performed. .

According to the inventions of claim 8 and claim 17, according to the situation of the groove side wall and groove bottom,
By using either or both of the pressure welding bolts and the support bolts, the temporary floor surface can be easily set in the groove without being affected by the structure and environment of the groove bottom.
Further, by using both the pressure welding bolts and the column bolts, the effect of preventing the temporary floor from falling off can be further enhanced.

According to the ninth aspect of the present invention, the height can be adjusted as appropriate according to the unevenness of the groove bottom where each support bolt is located. Therefore, the height of the temporary floor and the horizontal maintenance adjustment can be easily and quickly performed regardless of the unevenness of the groove bottom. Can be done.

According to the tenth aspect of the present invention, the support member can be configured relatively easily and inexpensively.
According to the device of claim 7,

    According to each of the inventions of claims 13 to 17, since the floor portion can be appropriately widened even for grooves having slightly different groove width dimensions, an appropriate floor covering that closes the two-division gap is used as the floor surface portion. It is possible to relatively freely cope with grooves having a slightly different groove width.

  According to the inventions of claims 15 to 17, any of the two divided intervals expanded according to the width of the groove can be easily and reliably maintained, and a stable temporary floor surface can be formed. Can be set.

DETAILED DESCRIPTION OF THE INVENTION A groove floor temporary installation device for a road side groove showing the best mode of the present invention will be described with reference to the drawings shown in Example 1 and Example 2.

In the groove floor temporary installation device of the first embodiment, the floor member temporarily installed in the groove is supported at a desired height position from the groove bottom so as to be stretched in the horizontal direction with respect to both side walls of the groove. It is an apparatus equipped with the latch means 14 so that attachment or detachment is possible.
FIG. 1 is a perspective view showing a temporary state of a temporary floor device in a groove according to a first embodiment, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. FIG. 4 is an enlarged cross-sectional view, and FIG.

  1 and 2, the illustrated temporary floor device 10 in the groove includes a flat floor surface portion 11 fitted in the groove so as to close the width direction of the upper open side 2 of the groove 1, and the floor surface portion 11. A floor surface member 13 having side surface portions 12 and 12 extending downward along both side walls of the groove 1, that is, left and right side walls 3 and 3 from both left and right edges, and the floor surface member 13 from the groove bottom 4. It is an apparatus provided with a horizontal maintaining hooking means 14 that is hooked on the left and right side walls 3 and 3 of the groove 1 at an appropriate height position and maintains the floor portion 11, that is, the temporary floor surface horizontally.

Although the side surface parts 12 and 12 of Example 1 are extended in the state bent downward over the full length of each right and left edge of the floor surface part 11, it is not restricted to this example, The horizontal maintenance latching means 14 Only at least a portion necessary for providing the pressure contact nut portion 15, for example, at least a part of each of the left and right edges may extend downward (not shown).

The horizontal maintaining latching means 14 of the first embodiment includes a pressing nut portion 15 fixed to each of the left and right side surface portions 12 and 12 so as not to rotate, and a groove 1 formed in each of the pressing nut portions 15. Each of the bolts is screwed in from the central space side, and the screwed bolt tip is configured to contact the side walls 3 and 3 of the groove 1 perpendicularly.

  Note that the pressure contact nut portion 15 does not necessarily need to use a nut, and may be formed by, for example, forming a female screw penetrating the side surface portion 12 in the horizontal direction. The term of the pressure welding nut portion 15 in this specification is meant to include such a female screw configuration.

  The front end of each pressure welding bolt 16 of the first embodiment is provided with a contact surface portion 17 formed in a flat plate shape so as to come into surface contact with the side walls 3 and 3 with which the front end contacts. The contact surface portion 17 is universally jointed so as to be rotatable in a hemispherical manner so as to be rotatable at an arbitrary angle on the hemispherical surface with respect to a bolt tip formed in a hemispherical shape.

  In addition, the surface of the contact surface portion 17 that comes into surface contact with the side wall 3 is an uneven surface (not shown) so as to increase the frictional resistance with the surface of the side wall 3. The resistance can be increased, and the pressure contact force against the side wall 3 by the screwing of the pressure welding bolt 16 can be further secured, and the effect of preventing the temporary floor surface from falling off can be enhanced.

In order to further increase the pressure contact force of the pressure contact bolt 16, the female screw holes as the pressure contact nut portions 15 provided between the both side surface portions 12, 12 are relatively aligned so that the center axes of the female screw holes coincide with each other. It is good to provide. This is because a high tensile force can be efficiently obtained by the pair of pressure welding bolts 16 and 16 screwed against the pair of female screw holes (15 and 15).
Accordingly, it is more effective to provide a large number (a plurality of pairs) of female screw holes as the press-contacting nut portions 15 forming such a pair.

In the floor portion 11, there are pressure welding bolt insertion holes 19 through which a screwdriver tool 18 (FIG. 2) that can be operated to turn the bolt head of a pressure welding bolt 16 that is screwed into a female screw hole as a pressure welding nut portion 15. It is provided corresponding to each bolt 16 for use.
Thereby, since the tool 18 can be inserted from the floor surface 11 through the insertion hole 19, the operation of the pressure welding bolt 16, that is, the bolt tightening or loosening operation can be easily performed.

The in-groove floor surface temporary installation device 20 according to the second embodiment has a plurality of support members that stand on the groove bottom 4 as standing leg means for supporting the floor surface member 13 temporarily installed in the groove at a desired height position from the groove bottom 4. 21 is a device that is detachably mounted on the floor member 13.
FIG. 5 is a perspective view showing a temporary state of the floor surface temporary installation device in the groove, FIG. 6 is a cross-sectional view of FIG. 1, and FIG.

  5 and 6, the illustrated grooved floor surface temporary device 20 supports the floor member 13 of the grooved floor surface temporary device 10 according to the first embodiment from the groove bottom to a desired height position. In addition to a plurality of horizontal maintaining hooking means 14 that are horizontally stretched with respect to the both side walls 3 and 3, a plurality of struts as a plurality of standing means for allowing the floor member 13 to stand on the groove bottom 4. The member 21 is detachably provided.

  Therefore, in the second embodiment, the same or substantially the same member as in the first embodiment is configured such that, for example, the floor member 13 of the first embodiment and the divided two members shown in the second embodiment are connected. Like the tool 18 for turning the floor member 13 and the bolt head of Example 1 from the overhead and the tool 18 for turning the bolt head of Example 2 from the side of the head, the same reference numerals are given, and the description thereof is omitted.

  5 and 6, the illustrated column member 21 includes a plurality of column nut portions 22 fixed to the inner surface side of the side surface portion 12 extending downward from the floor surface portion 11 of the floor surface member 13. The support bolt portion 23 is screwed into the support nut portion 22, and the support bolt portion 23 stands on the groove bottom 4 and the height of the floor member 13 through the support nut portion 22. That is, the height of the floor surface portion 11 is supported in an adjustable manner, and the floor surface member 13, that is, the floor surface portion 11 can be maintained horizontally by adjusting the screwing amount.

  The support bolt portion 23 is screwed into the support nut portion 22 from the vertical direction through each support bolt insertion hole 24 drilled in the floor portion 11, and the support bolt insertion hole 24 is formed of the support nut. The screw turning tool 18 (FIG. 2) for turning the bolt head of the support bolt part 23 screwed into the part 22 is sized so that it can be operated.

  Therefore, in the groove floor temporary installation device 20 of the second embodiment, as in the first embodiment, the floor member 13 is dropped into the groove 1 so as to be dropped into the groove 1, and the upper portion of the groove 1 is dropped. By inserting an appropriate bolt driver 18 in the vertical direction from the open side 2 into the post bolt insertion hole 24 of the floor surface portion 11, and freely operating the post bolt portion 23 under the floor surface portion 11, It is possible to easily and quickly perform the adjustment work for maintaining the height and level maintaining the floor member 13, that is, the floor surface portion 11 from the groove bottom 4 to a desired height position.

Further, similarly to the horizontal maintaining means 14 of the first embodiment, the support member 21 as a standing means is constituted by bolts and nuts, so that the support member 21 is made simple and easy, and the floor member 13 is formed. On the other hand, it can be configured to be detachable.
Further, by appropriately adjusting the length of each leg member 21, the horizontal maintenance work of the floor surface portion 11 as a temporary floor surface, that is, the temporary floor work is easily and quickly performed regardless of whether the groove bottom 4 is uneven. Can be done.
Naturally, the height of the floor surface member (temporary floor surface) 13 is compared with the conventional one according to the depth of the flowing water without blocking or diverting the flowing water in the groove 1. Can be set easily and freely.

Furthermore, according to the temporary floor device 20 in the groove according to the second embodiment, depending on the situation of the side wall 3 and the groove bottom 4 of the groove 1, the pressure maintaining bolt 16 of the horizontal maintaining latching means 14 and the standing leg means can be used. By using both or one of the support bolts 21, the temporary floor surface can be easily set in the groove without being affected by the structure and environment of the groove bottom 4.
Further, by using both the pressure contact bolt 16 as the horizontal maintaining latch means 14 and the support bolt 21 as the standing leg means, the temporary floor surface can be temporarily and more firmly installed, and the drop prevention effect is further enhanced. be able to.

  When both or any one of the pressure contact bolt 16 of the horizontal maintaining latching means 14 and the support bolt 21 as the standing leg means is used, the other is a corresponding nut portion (pressure contact nut portion 15 or support nut portion). It can be used by removing from 22), and it is possible to easily attach and detach any means as required while having both means of the horizontal maintaining latch means and the standing leg means.

In FIG. 7, the floor surface portion 11 (F) of the floor surface member 13 of the second embodiment is divided into two in the width direction of the floor surface portion 11 and is composed of a pair of one-side floor surface portions 11 </ b> A and 11 </ b> B. The one-side floor portions 11A and 11B are adjusted so that the two-divided interval L (width) can be appropriately expanded or reduced according to the width of the groove 1 via the connecting member 25 as an integration means. They are connected so as to be freely adjustable, that is, adjustable in enlargement / reduction.

The illustrated connecting member 25 includes an abutting member 26 which is assigned to cross the division interval L, that is, the vertical dividing line (L), across both rear surfaces of the pair of one-side floor portions 11A and 11B. A slit 27 (27A, 27B) provided in the contact member 26, and a plurality of screw rod portions 28 (28A) that penetrate the slit 27 and are implanted on the back side of each of the pair of one-side floor surface portions 11A, 11B. 28A, 28B, 28B) and these threaded rod portions 28 (28A, 28A, 28B, 28B) for fastening connection for fixing the contact member 26 to the back surface side of the one-side floor surface portions 11A, 11B. And a nut portion 29 (29A, 29A, 29B, 29B).

  The connecting members 25 addressed so as to intersect the division interval L, that is, the vertical line (L), may be arranged at an appropriate interval in the extending direction of the vertical line (L) (see FIG. Not shown).

Further, the slits 27 provided in the contact member 26 shown in the drawing are independently shown so as to correspond to the screw rod portions 28A and 28B respectively planted on the respective back surfaces of the pair of one-side floor portions 11A and 11B. Are formed as two slits as indicated by reference numerals 27A and 27B.
In this case, by forming the slits 27A and 22B to a predetermined length, the width of the division interval L, that is, the division width that can be enlarged or reduced, can be regulated in advance.

  A plurality of screw rod portions 28A, 28B planted on the back surface side of each one-side floor surface portion 11A, 11B, for example, at least two as shown in the figure, are arranged in parallel in the direction intersecting with the vertical line (L). By forming the width of the slit 27 (27A, 27B) substantially equal to the diameter of the screw rod portions 28A, 28B, the relative position of the paired one-side floor surface portions 11A, 11B can be appropriately adjusted, for example, the groove 1 In the extending direction, the pair of one-side floor portions 11A and 11B can be regulated so as not to be displaced.

According to the in-groove floor surface temporary device 20 of the second embodiment, an appropriate division width (L = can be enlarged or reduced) according to the width of the floor surface portion 11 of the groove 1 (in FIG. 7, width = 11A + L + 11B). Therefore, a hypothetical floor surface adapted to the width of the groove 1 can be temporarily set.
Moreover, compared with the floor member 13 of the floor surface temporary installation apparatus 10 of the said Example 1 comprised uniquely (depending on division width adjustment) according to the width | variety of the groove | channel 1, it shows in FIG. In the in-groove floor surface temporary device, the number of the in-groove floor surface temporary device prepared (manufactured) in advance according to the groove width is small, which is economical.

In the first and second embodiments, the lengths of the in-groove floor surface temporary devices 10 and 20 may be any appropriate length that can be handled, and the illustrated length is merely a length for convenience of drawing. is there.
The material of the floor member may be any of metal, resin, and other materials, and is not limited.

  The present invention is not limited to the side grooves on the road, and can be used widely for other grooves.

It is a perspective view which shows the temporary state of the floor surface temporary installation apparatus in a groove | channel (Example 1). FIG. 2 is a cross-sectional view of FIG. 1 (Example 1). (Example 1) which is an expanded sectional view of the horizontal maintenance latching means of the floor surface temporary installation apparatus in a groove | channel. It is operation explanatory drawing of the horizontal maintenance latching means of the floor surface temporary installation apparatus in a groove | channel (Example 1). (Example 2) which is a perspective view which shows the temporary state of the floor surface temporary installation apparatus in a groove | channel. (Example 2) which is sectional drawing of FIG. (Example 2) which is principal part disassembly explanatory drawing.

Explanation of symbols

1 groove 2 upper open side 3 side wall (side surface of groove)
4 groove bottom (bottom of groove)
10 Floor surface temporary installation device in groove (Example 1)
11 Floor (temporary floor)
11A One side floor (floor surface)
11B One side floor surface part (floor surface member)
12 Side (floor surface)
13 Floor member 14 Horizontal maintenance latching means 15 Pressure welding nut (horizontal maintenance latching means)
16 Pressure welding bolt (horizontal maintenance latch)
17 Contact surface portion 19 Pressure bolt insertion hole 21 Support member (standing leg means)
22 Prop nut part (Standing means)
23 Bolt part for prop (stand means)
24 Post Bolt Insertion Hole 20 Floor Groove Floor Temporary Device (Example 2)
21 Support member (Standing means)
22 Prop nut part (Standing means)
23 Bolt part for prop (stand means)
25 Connecting member 26 Contact member 27 Slit 27A, 22B Slit 24 Strut bolt insertion hole 28 Screw rod portion 28A, 28B Screw rod portion

Claims (17)

Extending downward along both side walls of the groove from at least a part of each of the flat floor surface portion fitted into the groove and the left and right edges of the floor surface portion so as to block the width direction of the upper open side of the groove A floor surface member (having a substantially U-shaped cross section),
A pressure-welding bolt that is screwed into a pressure-contact nut portion provided on each of the left and right side surface portions so as to abut against the side wall of the groove vertically;
A floor surface temporary installation device in a groove characterized by comprising:   The temporary installation device for a floor in a groove according to claim 1, wherein a tip of each pressure welding bolt includes a contact surface portion that makes surface contact with a side wall that makes contact.   The floor surface temporary installation device according to claim 2, wherein the abutting surface portion is a concavo-convex surface in which the surface in surface contact with the side wall increases the frictional resistance with the surface of the side wall.   The floor surface temporary installation device according to claim 2 or 3, wherein the contact surface portion is universally jointed to the tip of the pressure welding bolt.   5. The grooved inner floor according to claim 1, wherein the female screw holes provided between both side surface portions are provided so as to form a pair in which the central axes of the female screw holes coincide with each other. Surface temporary device. 6. The grooved floor surface temporary installation device according to claim 5, wherein a plurality of pairs of female screw holes are provided. 7. A pressure welding bolt insertion hole through which a screwdriver for turning the pressure welding bolt is operably penetrated is provided in the floor portion for each pressure welding bolt. Temporary equipment for floor surfaces in grooves. The temporary floor installation device in a groove according to any one of claims 1 to 7, further comprising a plurality of support members that support the floor member at a desired height position from the groove bottom.   9. The temporary floor device in a groove according to claim 8, wherein the support member is configured to be adjustable in height.   10. The groove according to claim 8, wherein the column member is configured by a column nut provided on the floor member side and a column bolt screwed into the column nut. Internal floor surface temporary equipment.   The in-groove floor surface temporary installation device according to claim 10, wherein the support nut portion is provided on an inner surface side of a side surface portion extending downward from the floor surface portion.   12. The temporary floor surface in a groove according to claim 10, wherein the column bolt is screwed into the column nut from above the floor through a column bolt insertion hole drilled in the floor surface portion. apparatus.   The floor surface temporary installation device according to any one of claims 1 to 12, wherein the floor surface portion is configured by a pair of one-side floor surface portions obtained by dividing the floor surface portion into two in the width direction.   The floor surface temporary installation device according to claim 13, wherein the floor surface is connected to a pair of one-side floor surface portions through a plurality of connecting members so as to be adjustable in two-divided intervals. The connecting member includes an abutting member addressed over both back sides of the pair of one-side floor portions, a slit provided in the abutting member so as to extend in the direction of enlargement / reduction of the two-divided interval, A screw rod portion planted on the back surface side of each of the pair of one-side floor surface portions so as to pass through the slit, and a tightening nut that is screwed to the screw rod portion and presses and fixes the contact member to the back surface side of the one-side floor surface portion. The groove floor temporary installation apparatus of Claim 13 or Claim 14 characterized by having a part.   The in-groove floor surface temporary installation device according to claim 15, wherein the slits provided in the contact member are independently provided for each back surface side of the pair of one-side floor surface portions.   17. The temporary floor surface installation device in a groove according to claim 15, wherein a plurality of screw rod portions planted on each back surface side of the pair of one-side floor surface portions are arranged side by side.

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