JP7567004B2 - Floor structure - Google Patents

Description

The present invention relates to a floor structure that can be used for a long period of time and is constructed at a position higher than the base surface.

In a conventional method for constructing a floor structure , as shown in Patent Document 1, a filler material is filled into a space surrounded by side walls, and then a flooring material is placed on top of the filler material.

Patent No. 2775693 (paragraph [0002], Figure 2)

In the above-mentioned conventional method for constructing a floor structure , the flooring is installed after the filling material has been filled, so it takes a long time before the floor can be used.

The present invention has been made in consideration of the above circumstances, and has an object to provide a floor structure that enables the floor to be used from an early stage.

The first aspect of the invention made to achieve the above object is a method for constructing a floor at a position higher than a base surface, comprising forming a support having a plurality of supports on the base surface,
This is a floor construction method in which a floor material is placed on the support, and a filler material is filled into the space between the base surface and the floor material, thereby integrating the filler material and the support material.

The second aspect of the invention is a method for constructing a floor according to the first aspect, in which a side wall is formed to surround the support, and the filling material is filled into the space enclosed by the floor material and the side wall.

The third aspect of the invention is the floor construction method described in the second aspect, in which the side walls are connected to the supports when forming the side walls.

The fourth aspect of the invention is a method for constructing a floor according to the first aspect, in which the base surface is the bottom surface of an underground space having an opening in the ground, the floor material is placed on the support so as to close the opening, and the filling material is filled into the space closed by the floor material and the wall of the underground space.

The fifth aspect of the invention is a method for constructing a floor according to any one of the first to fourth aspects, in which a rigid polyurethane foam is used as the filler.

The sixth aspect of the invention is a floor construction method according to any one of the first to fifth aspects, in which, in forming the support, a cross member is horizontally laid between the upper ends of the plurality of supports, and a joist is fixed to the cross member, the joist has a main body with a gate-shaped cross section and a flange portion that protrudes outward from the lower end of each leg of the main body, and the floor material is fixed to the top of the main body.

The seventh aspect of the invention is a floor construction method according to the sixth aspect, in which the cross member has a circular cross section, a connecting fitting is prepared that has an annular fitting portion that fits into the cross member from the outside and a protruding piece that protrudes outward from the fitting portion, and when fixing the joist material to the cross member, the fitting portion of the connecting fitting is fitted into the cross member from the outside, and the protruding piece of the connecting fitting and the flange portion of the joist material are overlapped and fixed.

[First to fifth aspects of the invention]
According to the first aspect of the invention, the floor can be used from an early stage because the simple structure of placing the flooring on the support is first constructed. Then, by filling the space between the flooring and the base surface with a filler, the flooring is supported by the filler integrated with the support. This allows the floor to be used for a long period of time.

The floor may be constructed as follows. That is, as in the second aspect of the invention, side walls are formed to surround the support, and the space enclosed by the floor material and the side walls is filled with a filler. Alternatively, as in the fourth aspect of the invention, the floor material is placed on the support so as to close the opening, with the bottom surface of an underground space having an opening in the ground as the base surface, and the filler is filled in the space enclosed by the floor material and the wall of the underground space. Examples of the former type of floor include platform floors and stage floors. Examples of the latter type of floor include a floor formed in the opening of an underground passage or basement by filling it in.

When forming a side wall surrounding the support, the side wall can be stably fixed by connecting the side wall to the support (third aspect of the invention).

The filler may be a rigid polyurethane foam (the fifth aspect of the invention), concrete, earth and sand, or air-foamed lightweight soil. Examples of the rigid polyurethane foam used as the filler include a block of pre-foamed rigid polyurethane foam, crushed pre-foamed rigid polyurethane foam, and rigid polyurethane foam (rigid polyurethane foam foamed on site) formed by reacting and spraying two liquid raw materials consisting of a base agent (liquid A) and a hardener (liquid B) on site. If rigid polyurethane foam foamed on site is used as the filler, the filler can be filled without gaps even in narrow gaps in the space between the base surface and the floor material. The filler may be composed of a block of pre-foamed rigid polyurethane foam or crushed material thereof combined with rigid polyurethane foam foamed on site.

[Sixth aspect of the invention]
According to the sixth aspect of the invention, the flooring can be stably fixed to the top of the joists, since the joists have a main body with a gate-shaped cross section. Furthermore, the joists have flanges extending from the lower ends of the legs of the main body, so the joists can be easily fixed to the cross members by using the flanges of the joists.

[Seventh aspect of the invention]
According to the seventh aspect of the invention, the connecting fitting is structured so that the protruding piece protrudes outward from the annular mating portion, so that even if the cross member has a circular cross section, it is possible to fix the protruding piece to the joist material by mating the mating portion with the cross member.

FIG. 1 is a perspective view of a platform with a floor according to a first embodiment; A-A cross section of the platform B-B cross section of platform Cross-sectional side view of the connecting fitting (A) A perspective view of a panel material, (B) an enlarged view showing the end of the strip material. (A) is a perspective view of a side wall fixing portion, and (B) is a side cross-sectional view. Side cross-sectional view to explain the floor construction process Side cross-sectional view to explain the floor construction process FIG. 13 is a perspective view illustrating the fixing of the wall material fixing portion to the wall material; Schematic diagram for explaining filling of a filler FIG. 2A is a side cross-sectional view of an underground filling body having a floor according to a second embodiment; FIG. 2B is an enlarged side cross-sectional view of the lifting section and its surroundings; C-C cross section of underground filling body Side cross-sectional view to explain the floor construction process Schematic diagram for explaining filling of a filler 1A is a side cross-sectional view of a connecting fitting according to another embodiment, FIG. 1B is a side view of the connecting fitting, and FIG.

As shown in FIG. 1, the floor 10 of this embodiment is the floor of a platform 100 where passengers of trains and the like get on and off, and is constructed at a position higher than the ground G on which the tracks R are laid. Specifically, as shown in FIG. 2, on the platform 100, the floor material 11 constituting the floor 10 is supported from below by a support 20 erected on the ground G. In this embodiment, the ground G serves as the base surface that supports the support 20.

The platform 100 also includes side walls 30 that surround the support 20 on all four sides (front, back, left and right sides), and a filler 40 that fills the space enclosed by the floor material 11 and the side walls 30. The floor material 11 is also supported from below by the filler 40 that is integrated into the support 20. The filler 40 is made of hard polyurethane foam that is foamed on site.

As shown in FIG. 2, the support 20 comprises a number of pillars 21 and cross members 22 that are horizontally stretched between the pillars 21. The pillars 21 are formed by attaching a pillar body 21B to a jack 21A for adjusting the height of the pillars 21. The jack 21A is, for example, a screw jack. The pillar body 21B has a circular cross section and is, for example, a circular pipe. In the support 20, a number of sets of pillars 21, each of which is made up of a predetermined number of pillars 21 aligned in the width direction of the platform 100, are aligned in the longitudinal direction of the platform 100.

There are two types of cross members 22: a first cross member 22A that extends along the longitudinal direction of the platform 100, and a second cross member 22B that extends along the width direction of the platform 100. The first cross member 22A and the second cross member 22B are each fixed to the support 21 by fixing fixtures such as clamps. Both the first cross member 22A and the second cross member 22B are formed with a circular cross section and are made of, for example, a circular pipe.

As shown in FIG. 4, the first cross member 22A includes an upper cross member 22J that spans between the upper ends of the multiple pillars 21. A joist 24 is fixed to the upper cross member 22J via a connecting metal fitting 23.

The connecting fitting 23 consists of a fitting portion 23A formed in a circular ring shape and a protruding piece 23B that protrudes radially outward from the fitting portion 23A. The inner diameter of the fitting portion 23A is approximately the same as the outer diameter of the upper cross member 22J, and the fitting portion 23A fits into the upper cross member 22J from the outside. The protruding piece 23B protrudes from two points 180 degrees apart in the circumferential direction of the fitting portion 23A, and both of these two protruding pieces 23B, 23B are arranged horizontally. The fitting portion 23A is fixed to the upper cross member 22J by screw fastening.

The joist material 24 has a structure in which a flange portion 24F projects outward from the lower end of each of a pair of legs 24K, 24K of a main body portion 24H that has a gate-shaped cross section. The flange portion 24F is fixed on top of the protruding piece 23B of the connecting fitting 23. The floor material 11 is screwed onto the top portion 24T of the main body portion 24H. The flange portion 24F and the protruding piece 23B are fixed by screw fastening.

As shown in FIG. 1, the floor material 11 is formed by arranging a number of panel materials 12 in the longitudinal direction of the platform 100. As shown in FIG. 5, the panel material 12 is formed by connecting a number of strip materials 13 in the width direction by connecting members 14. Specifically, the connecting members 14 have an L-shaped cross section and extend in the width direction of the strip materials 13 with one side of the L facing downward. The connecting members 14 are screwed to the strip materials 13 with the other side of the L-shape of the connecting members 14 placed against the undersides of the strip materials 13.

As shown in FIG. 5, the strip 13 has a structure in which a pair of main walls 13A, 13A facing each other in the thickness direction are connected by multiple connecting walls 13B. The connecting walls 13B extend along the longitudinal direction of the strip 13.

As shown in FIG. 2, the side wall 30 is made up of multiple vertically arranged wall materials 31 lined up in the height direction and longitudinal direction of the platform 100. The wall materials 31 have the same structure as the strip material 13 described above, and are made up of a pair of main walls 31A, 31A connected by multiple connecting walls 31B. The wall materials 31 are arranged so that the width direction of the main walls 31A is vertical.

Each wall material 31 of the side wall 30 is connected to the support pillar 21 of the support body 20 by a side wall connecting part 50. This stabilizes the side wall 30. As shown in FIG. 6(A), the side wall connecting part 50 is formed by connecting a support fixing part 51 fixed to the support pillar 21 and a wall material fixing part 52 fixed to the wall material 31.

Specifically, the pillar fixing part 51 has a structure similar to that of the connecting metal fitting 23 described above, and the protruding piece 51B protrudes outward from the fitting part 51A that fits into the pillar 21 from the outside. The wall material fixing part 52 has a structure in which a screw shaft 52S stands up from a base plate 52P. Here, a slit 31S extending inward from the outer edge of the main wall 31A is formed in the main wall 31A of the wall material 31 facing the support body 20 side, and the base plate 52P of the wall material fixing part 52 is received inside the wall material 31, and the screw shaft 52S is inserted into the slit 31S. The base plate 52P is fixed to the main wall 31A by screw fastening, and the screw shaft 52S is fixed to the protruding piece 51B by screw fastening.

The spaces between the floor material 11 and the side wall 30, between the side wall 30 and the ground G, between the multiple strip materials 13, between the multiple wall materials 31, etc. are sealed with a sealing material such as a packing (not shown).

The floor 10 of this embodiment is constructed as follows. First, as shown in FIG. 7(A), the support 20 is erected on the ground G (support formation process), and the floor material 11 is installed on the support 20 (floor installation process). Next, as shown in FIG. 7(B), the side wall 30 surrounding the support 20 is formed (side wall construction process). Once the side wall 30 is formed, the filler material 40 is filled into the space S1 closed by the floor material 11 and the side wall 30 as shown in FIG. 8(A) (filling process). Then, when the filler material 40 is integrated with the support 20, the platform 100 is completed as shown in FIG. 8(B), and the floor 10 supported from below by the support 20 and the filler material 40 is completed.

Details of the support formation process are as follows. In the support formation process, first, a number of pillars 21 are erected on the ground G, and cross members 22 are placed between the pillars 21. The pillars 21 are arranged along the extension direction of the tracks R (see FIG. 1) and along a direction perpendicular to the extension direction. The height of each pillar 21 is adjusted by a jack 21A as necessary. Prior to erecting the pillars 21, pillar fixing parts 51 (see FIG. 6(A)) are fixed to the pillars 21 arranged in the row closest to the tracks R and the pillars 21 arranged in the row furthest from the tracks R.

The cross members 22 are fixed to the pillars 21 by fixing brackets (not shown) such as clamps that are fixed to the pillars 21 in advance. The cross members 22 arranged along the direction in which the track R extends are the first cross members 22A, and the cross members 22 arranged along the direction perpendicular to the track R are the second cross members 22B. Among the cross members 22 that become the first cross members 22A, the cross member 22 that spans the upper ends of the pillars 21 is the upper cross member 22J. Here, the cross member 22 that becomes the upper cross member 22J has a connecting bracket 23 (see FIG. 4) fixed in advance, and the cross member 22 that becomes the upper cross member 22J is positioned so that the protruding piece 23B of the connecting bracket 23 is horizontal.

When the upper end horizontal member 22J is spanned between the multiple supports 21, the joist material 24 is fixed to the connecting fitting 23. Specifically, the flange portion 24F of the joist material 24 is placed on the protruding piece 23B of the connecting fitting 23, and the flange portion 24F and the protruding piece 23B are screwed together. This completes the support body forming process. Thus, in this embodiment, the connecting fitting 23 interposed between the upper end horizontal member 22J and the joist material 24 has a structure in which the protruding piece 23B protrudes outward from the annular fitting portion 23A. Therefore, even if the horizontal member 22 has a circular cross section, it is possible to fix the joist material 24 to the protruding piece 23B with the fitting portion 23A fitted to the horizontal member 22.

Details of the flooring installation process are as follows. In the flooring installation process, multiple panel materials 12 are arranged on the joists 24 of the support body 20 and screwed to the joists 24 (specifically, the tops 24T of the joists 24). Here, the main body 24H of the joists 24 has a gate-shaped cross section, making it possible to stably fix the flooring 11 to the joists 24.

The panel materials 12 are arranged in the direction in which the track R extends. Each panel material 12 is arranged with the connecting members 14 (see FIG. 5) facing downwards, so that the width direction of the strip material 13 is approximately parallel to the track R. Note that in order to shorten the time required for the flooring installation process, the panel materials 12 are prepared prior to the flooring installation process. The panel material 12 is formed by arranging the strip materials 13 in the width direction and connecting the strip materials 13 with the connecting members 14.

When the multiple panel materials 12 are fixed to the joists 24, the floor material 11 that constitutes the floor 10 is installed on the support 20, and the floor material installation process is completed. At the end of the floor material installation process, the floor 10 is supported from below only by the support 20, and the support 20 has a strength sufficient to withstand the short-term use of the floor 10. Here, short-term use refers to a structure that is constructed for the purpose of existing only for a specific period of time and dismantled after the specific period, that is, use as a temporary structure. The specific period depends on the purpose, use, frequency of maintenance, etc., but is generally about six months to one year. In contrast, long-term use refers to a structure that is constructed for the purpose of continuous use without a set usage limit, that is, use as a permanent structure or a permanent structure.

Details of the side wall forming process are as follows. In the side wall forming process, a plurality of wall materials 31 are arranged to surround the support 20 on all sides, and each wall material 31 is fixed to the support 21. The wall materials 31 are arranged so that the main wall 31A in which the slits 31S are formed faces the support 20, and the main wall 31A is vertical. In detail, the plurality of wall materials 31 are arranged around the support 20 and stacked up and down. The gaps between the wall materials 31, the gaps between the wall materials 31 and the ground G, and the gaps between the wall materials 31 and the floor material 11 are sealed with a sealant.

The wall material fixing portion 52 is fixed to the wall material 31 in advance, and the screw shaft 52S of the wall material fixing portion 52 is screwed to the protruding piece 51B of the support fixing portion 51 fixed to the support 21. When the screw shaft 52S is screwed to the protruding piece 51B, the wall material 31 is fixed to the support 21. When the multiple wall materials 31 are fixed to the support 21, the side wall 30 is completed and the side wall forming process is completed. Then, when the side wall forming process is completed, a space S1 closed by the floor material 11 and the side wall 30 is formed below the floor material 11. Note that an entrance and exit for the space S1 is secured in the side wall 30. The entrance and exit are arranged, for example, at one end of the side wall 30 in the extension direction of the track R.

The wall material fixing part 52 is fixed to the wall material 31 as follows. That is, as shown in FIG. 9, the base plate 52P of the wall material fixing part 52 is inserted between the pair of main walls 31A, 31A, and the screw shaft 52S is passed through the slit 31S. Then, the base plate 52P is fastened to the main wall 31A having the slit 31S.

The details of the filling process are as follows. In the filling process, the foaming liquid of the rigid polyurethane foam as the filling material 40 is sprayed into the space S1. The filling material 40 is filled from the side farther from the entrance of the space S1 (for example, the other end in the extension direction of the track R) toward the side closer to the entrance. Then, when the entire space S1 is filled with the filling material 40, the support 20 is buried in the filling material 40. This completes the filling process. Since the filling material 40 is filled into the space S1 closed by the floor material 11 and the side wall 30, no curing is required to prevent the filling material 40 from scattering. Furthermore, a process of finishing the top surface of the filling material 40 flat for the installation of the floor material 11 is not required. In addition, since the filling material 40 is made of rigid polyurethane foam, the members (for example, the panel material 12 and the support 21) constituting the floor material 11, the support 20, and the side wall 30 are rust-proofed. In this embodiment, the spraying is carried out on-site by discharging (mixing) two liquids at high pressure: a base liquid (liquid A) whose main components are polyol, crosslinking agent, foaming agent, etc., and a hardener (liquid B) whose main component is isocyanate. Both liquids A and B are liquid at room temperature.

Here, since heat is generated during the process in which the foaming liquid is foamed and hardened to become a hard polyurethane foam, the foaming liquid is sprayed in a predetermined amount at a time. Therefore, the filling material 40 is formed in layers from the end of the space S1 farthest from the entrance toward the entrance. The foaming liquid is preferentially sprayed onto the underside of the flooring 11 and the inner surface of the side wall 30. Specifically, the first layer 40K1 of the filling material 40 formed first is formed in a shell shape that contacts the underside of the flooring 11 and the inner surface of the side wall 30 (FIG. 10(A)), and the second layer 40K2 and the third layer 40K3 of the filling material 40 formed second or later are formed in a vertical wall shape inside the first layer 40K1 (see FIG. 10(B)). Then, when the inner part of the first layer 40K1 is filled with the filling material 40, a shell-shaped layer similar to the first layer 40K1 is formed on the filling material 40 from the side closer to the entrance, and multiple vertical wall-shaped layers are formed on the inner part of that layer.

When the filling process is completed and the filler 40 is integrated with the support 20, the platform 100 (see Figure 1) is completed, and the floor 10 shown in Figure 2 is completed. Then, the floor 10 is supported not only by the support 20 but also by the filler 40, which allows the floor 10 to be used for a long period of time (becoming a permanent structure).

In the construction method of the floor 10 of this embodiment, after the support formation process is completed, a floor material installation process is performed before the side wall formation process and the filling process. In the floor material installation process, the floor 10 is formed simply by installing the floor material 11 on the support 20, and the floor 10 can be used for a short period of time. This allows the floor 10 to be used early without waiting until construction is completed. Moreover, in this embodiment, the floor material 11 is supported from below not only by the support 20 but also by the filling material 40 in the filling process, so that the floor 10 can be used for a long period of time when construction is completed.

In addition, in this embodiment, the filler 40 is formed by directly spraying on-site hard polyurethane foam, so that the filler 40 can be easily filled in the gaps between the components that make up the support 20 in the space S1 (for example, the gaps between the cross members 22 and joists 24 and the flooring 11, and the gaps between the posts 21 and the side walls 30). As a result, the space S1 is filled with the filler 40 without any gaps, stabilizing the support of the flooring 11.

In addition, since the filler 40 is made by directly spraying on-site rigid polyurethane foam, it is possible to fill the filler 40 from the underside of the floor material 11 downward, which prevents voids from occurring in the filler 40 and allows the filler 40 to be filled without gaps. Therefore, the floor material 11, the support 20, and the side wall 30 are integrated by the filler 40, and the floor material 11 is supported in a state in which the floor material 11, the support 20, and the side wall 30 are integrated through the filler 40. This allows the platform 100 to be a strong permanent structure, and the floor 10 can be used for a long time. In addition, when the filler 40 is made of rigid polyurethane foam, the filler 40 is lightweight, so the platform 100 itself is also lightweight. This makes it possible to prevent the platform 100 from tilting or deforming due to ground subsidence or the like after construction.

In this embodiment, the connecting fitting 23 and the post fixing part 51 have the same structure, so the connecting fitting 23 and the post fixing part 51 can be made common. Furthermore, the band material 13 and the wall material 31 that constitute the panel material 12 have the same structure, so the band material 13 and the wall material 31 can be made common.

[Second embodiment]
As shown in Fig. 11 (A), the floor 10V of this embodiment is formed by an underground filling material 200 that fills an underground passage 210. The underground passage 210 includes a plurality of openings 211A that open to the ground G at entrances 211 provided at a plurality of points, an elevator section 230 that leads from the openings 211A to the underground, and a passage body 220 that extends approximately parallel to the ground G and connects the elevator sections 230 to each other. In the example of Fig. 11 (B), a staircase 230K is formed in the elevator section 230, but a slope may be formed.

The underground filler 200 fills the entire underground passage 210 (i.e., the entire lift section 230 and passage body 220). The upper part of the underground filler 200 closes the opening 211A, and the upper surface of the underground filler 200 is flush with the ground G. The part of the underground filler 200 exposed from the opening 211A forms the floor 10V.

As shown in FIG. 12, the underground filling body 200 is the same as the platform 100 of the first embodiment in that it includes a floor material 11, a support 20, and a filling material 40, but differs from the platform 100 in that it does not include a side wall 30. The structures of the floor material 11, the support 20, and the filling material 40 in the underground filling body 200 are the same as those in the first embodiment, so the same reference numerals are used and the description will be omitted.

The floor material 11 in the underground filling body 200 closes the opening 211A of the underground passage 210. The support 20 in the underground filling body 200 is erected on the underground floor surface BF of the underground passage 210. The underground floor surface BF is composed of the floor surface BF1 of the passage body 220 and the floor surface BF2 of the lifting section 230, and serves as a base surface that supports the support 20. In the example shown in FIG. 11(B), the support 20 is erected only on the floor surface BF2 of the lifting section 230, and the support 21 is erected on the tread surface (i.e., the surface facing upward) of the staircase 230K.

The construction method for floor 10V of this embodiment is common to the construction method for floor 10 of the first embodiment in that it includes a support forming process, a floor material installation process, and a filling process, but differs from the construction method for floor 10 in that it does not include a side wall formation process. Below, the construction method for floor 10V will mainly be described in terms of the support forming process, floor material installation process, and filling process that differ from the construction method for floor 10 of the first embodiment.

In the support formation process, multiple pillars 21 are erected on the underground floor surface BF of the underground passage 210 (floor surface BF2 of the lift section 230) (see FIG. 13(A)). In this embodiment, the multiple pillars 21 are erected on the tread surface of the stairs 230K. The upper ends of the multiple pillars 21 are aligned in height and positioned slightly below the opening 211A of the underground passage 210.

In the flooring installation process, a plurality of panel materials 12 are arranged to block a plurality of openings 211A of the underground passage 210. Then, the flooring 11 that blocks the openings 211A is formed by the plurality of panel materials 12, and a space S2 is formed that is closed by the flooring 11 and the walls of the underground passage 210 (specifically, the floor wall 212, side wall 213, and ceiling wall 221 of the underground passage 210). At this time, an entrance (not shown) is formed in the flooring 11 that blocks a specific opening 211A, allowing workers to enter and exit during the filling process. When the flooring installation process is completed, a floor 10V supported only by the support body 20 is simply formed.

In the filling process, the space S2 is filled with a filler 40, which is a rigid polyurethane foam formed on site, sprayed from an opening 211A other than the specific opening 211A toward the specific opening 211A. The filler 40 is formed in layers in multiple batches. Specifically, the first layer 40L1 of the filler 40 formed first is formed horizontally so as to cover the entire lower surface of the floor material 11 that blocks the opening 211A other than the specific opening 211A (see FIG. 14A), and the second layer 40L2, the third layer 40L3, and the fourth layer 40L4 of the filler 40 formed second or later are formed in a vertical wall shape below the first layer 40L1 (see FIG. 14B). Then, when the lower part of the first layer 40L1 is filled with the filler 40, a vertical wall-shaped layer similar to the second layer 40L2 is formed on the filler 40 from the side closer to the specific opening 211A.

Even with the construction method for the floor 10V of this embodiment, at the end of the floor material installation process, the floor material 11 that forms the floor 10V is supported only by the support 20, so the floor 10V can be used early without waiting until construction is complete. Furthermore, the filling process supports the floor material 11 from below not only by the support 20 but also by the filling material 40, so that the floor 10V can be used for a long period of time at the end of construction. Furthermore, the construction method for the floor 10V of this embodiment does not include a side wall formation process, so the construction period can be shortened.

[Other embodiments]
(1) The filler 40 may be made of concrete, earth and sand, or air-filled lightweight soil. In this case, in the filling step, the filler 40 made of concrete or earth and sand is piled upward.

The filler 40 may also be constructed by combining a block of pre-foamed rigid polyurethane foam or its pulverized material with rigid polyurethane foam foamed in situ. In this case, in the filling process, a plurality of blocks of rigid polyurethane foam or its pulverized material are placed in the spaces S1 and S2, and the foaming liquid of rigid polyurethane foam is sprayed into the gaps between the blocks or their pulverized material and the floor material 11 and the side wall 30. Here, rigid polyurethane foam foamed in situ becomes hot due to an exothermic reaction, so by combining the pre-foamed block or its pulverized material, it is possible to suppress the amount of heat generated by the rigid polyurethane foam in the filling process.

(2) In the first embodiment, the floor 10 formed at a position higher than the ground G was the floor of the platform 100. However, any floor formed at a position higher than the ground G may be used, for example, the floor of a stage.

(3) In the first embodiment, an existing side wall erected on the ground G (for example, a side wall of an outdoor pool constructed at a position higher than the ground G, a fence, etc.) may be used as the side wall 30. If the existing side walls surrounding the support 20 on all sides are used as the side wall 30, the side wall formation process becomes unnecessary. The existing side wall may be used as part of the side wall 30. Even in this case, the construction period of the side wall formation process can be shortened.

(4) In the second embodiment, an underground passage 210 is shown as an example of something that can be filled with the underground filling material 200, but any underground space can be used, such as a basement, underground warehouse, underground pit, etc.

(5) In the above embodiment, the protruding piece 23B of the connecting fitting 23 protrudes from two points of the fitting portion 23A. However, as shown in FIG. 15(A), the protruding piece 23B of the connecting fitting 23 may protrude from only one point of the fitting portion 23A.

(6) In the above embodiment, the joist 24 is connected to the upper cross member 22J via the connecting metal fitting 23. However, as shown in FIG. 15(B), a U-bolt may be used instead of the connecting metal fitting 23. In this case, the upper cross member 22J is placed inside the U-bolt, and both ends of the U-bolt are screwed to a pair of flanges of the joist 24. As shown in FIG. 15(C), the joist 24 may be connected to the upper cross member 22J extending in the width direction of the platform 100 via a U-bolt. In this case, the U-bolt is screwed to the flange portion 24F of the joist 24. The flange portion 24F of the joist 24 may be directly screwed to the upper cross member 22J extending in the width direction of the platform 100. In this way, the joist 24 can be easily fixed to the upper cross member 22J by using the flange portion 24F of the joist 24.

(7) In the above embodiment, the first cross member 22A and the second cross member 22B are formed to have a circular cross section, but the first cross member 22A and the second cross member 22B may be formed to have an angular cross section, for example, may be composed of a square pipe. In this case, it is possible to fix the flange portion 24F of the joist material 24 directly to the upper end cross member 22J without using the connecting metal fitting 23. Also, the support body 20 may not include the joist material 24, and the floor material 11 may be screwed directly to the upper end cross member 22J.

10, 10V Floor 11 Floor material 20 Support 30 Side wall 40 Filling material 100 Platform 200 Underground filling body 210 Underground passage

Claims (1)

A floor structure constructed at a position higher than the basement surface of an underground space having an opening in the ground, the basement surface being the bottom surface of the underground space,
A support body having a plurality of support columns formed on the base surface;
A floor material placed on the support so as to close the opening;
A filling material is filled in an area enclosed by the base surface, the floor material, and the wall of the underground space, and is integrated with the support ,
The floor structure wherein the filler is a rigid polyurethane foam .

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