Underfloor inspection hatch structure for steel floors

Abstract

To provide a steel floor underfloor inspection hatch structure that ensures the efficiency of inspection work by workers. [Solution] The underfloor inspection hatch structure for a steel floor is formed by laying multiple perforated steel flooring materials in a planar manner on top of multiple beams arranged at intervals from each other. An underfloor inspection hatch is formed by cutting away a portion of the steel floor consisting of a part of the perforated steel flooring materials arranged in a row in the direction of extension of the beams. The structure includes a cover made of the perforated steel flooring material in the portion of the structure that fits into the underfloor inspection hatch.

Description

[Technical Field]

[0001] The present disclosure relates to an underfloor inspection opening structure for a steel floor. [Background Art]

[0002] As a prior art, Patent Document 1 discloses a steel floor formed by laying perforated steel floor members. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2020-70682 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] By the way, when an underfloor inspection opening is provided in a steel floor on which perforated steel floor members are laid, a checkered steel plate, also called a checker plate, is often used as a cover body for covering the underfloor inspection opening. When a checkered steel plate is used as the cover body, there is a problem that it takes a lot of labor for workers to open and close the cover body. In addition, when a checkered steel plate is used as the cover body, the outer peripheral surface of the checkered steel plate is placed on the upper part of the steel floor, which creates a step between the steel floor and the checkered steel plate, which hinders the walking of workers or the transportation of work tools during inspection work. This poses the problem mentioned above.

[0005] Therefore, when a checkered steel plate is used as the cover body, there is a problem that the efficiency of the inspection work by workers decreases. However, in the prior art, no effective and appropriate means capable of solving the above-mentioned problems has been provided.

[0006] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide an underfloor inspection opening structure for a steel floor that can ensure the efficiency of inspection work by workers. [Means for Solving the Problem]

[0007] The steel floor underfloor inspection opening structure of the present disclosure is a steel floor formed by laying a plurality of perforated steel flooring materials in a planar manner on top of a plurality of beam members arranged at intervals from each other, and an underfloor inspection opening is formed by cutting away a portion of the steel floor consisting of a portion of the perforated steel flooring materials arranged in a row in the extending direction of the beam members, and comprises a cover made of the perforated steel flooring material of the portion and fitted into the underfloor inspection opening.

[0008] According to this disclosure, the lid can be made lighter, thus reducing the effort required for workers to open and close it. Furthermore, the absence of a step between the steel floor and the lid allows for smoother walking by workers or easier transport of tools during inspection work. Therefore, the efficiency of inspection work by workers can be ensured.

[0009] In one embodiment of the present disclosure, the cover comprises fixing members that connect a plurality of the perforated steel flooring materials in a portion of the area to one another.

[0010] According to one aspect of this disclosure, the effort required for workers to open and close the lid can be further reduced.

[0011] In one embodiment of the present disclosure, the cover is positioned across a plurality of perforated steel flooring materials connected by the fixing members, and includes reinforcing members on the underside surface of the cover that reinforce the perforated steel flooring materials.

[0012] According to one aspect of this disclosure, it is possible to further facilitate the walking of workers or the transport of work tools during inspection work.

[0013] In one aspect of this disclosure, the underfloor inspection opening is formed between adjacent beam members.

[0014] According to one aspect of this disclosure, space for workers to perform inspection work can be reliably secured.

[0015] In one embodiment of the present disclosure, the underfloor inspection opening structure of a steel floor further comprises a cover that covers the cut portion of the steel floor.

[0016] According to one aspect of the present disclosure, since the cut section of the steel floor is protected by the cover, safety can be ensured for workers during inspection work.

[0017] In one aspect of the present disclosure, the underfloor access opening structure for a steel floor further includes: a support member that extends along the cover, has both ends fixed to a lower portion of the steel floor, and supports the lid body; a ladder installed to extend downward from the underfloor access opening; and a mounting member that attaches the ladder to the support member.

[0018] According to one aspect of the present disclosure, the efficiency of inspection work performed by workers can be further improved. Effects of the Invention

[0019] According to the present disclosure, it is possible to provide an underfloor access opening structure for a steel floor that can ensure the efficiency of inspection work performed by workers. Brief Description of the Drawings

[0020] [Figure 1] Figure 1 is a schematic diagram showing a building structure provided with an underfloor access opening structure for a steel floor according to one embodiment. [Figure 2] Figure 2 is a schematic perspective view showing a perforated steel floor material used in the underfloor access opening structure for a steel floor according to one embodiment. Figure 2(a) is a schematic perspective view of the perforated steel floor material viewed from the front side. Figure 2(b) is a schematic perspective view of the perforated steel floor material viewed from the back side. [Figure 3] Figure 3 is a schematic plan view showing an underfloor access opening structure for a steel floor according to one embodiment. [Figure 4] Figure 4 is a perspective view showing a lid body in the underfloor access opening structure for a steel floor according to one embodiment. [Figure 5] Figure 5 is a schematic perspective view showing a ladder mounting structure in the underfloor access opening structure for a steel floor according to one embodiment. [Figure 6] Figure 6 is a schematic front view showing a ladder mounting structure in the underfloor access opening structure for a steel floor according to one embodiment. Mode for Carrying Out the Invention

[0021] Hereinafter, an underfloor inspection opening structure of a steel floor, which is an embodiment of the present disclosure, will be described with reference to the drawings.

[0022] Figure 1 is a schematic diagram showing a building structure provided with an underfloor inspection opening structure for a steel floor. Figure 2 is a schematic perspective view showing a perforated steel floor material used in an underfloor inspection opening structure for a steel floor. Figure 3 is a schematic plan view showing an underfloor inspection opening structure for a steel floor.

[0023] As shown in Figure 1, the steel floor 1 is formed as, for example, the floor surface of a machine room 3. A dust-proof room 5 such as a clean room is formed on the lower side of the steel floor 1, and a ceiling plenum 7 of the dust-proof room 5 is formed between the steel floor 1 and the dust-proof room 5. Although not shown in the drawings, equipment for the dust-proof room 5 such as an air conditioner for keeping the air in the dust-proof room 5 clean is installed in the ceiling plenum 7.

[0024] An underfloor inspection opening 1a is formed in the steel floor 1. The underfloor inspection opening 1a is formed for performing maintenance and inspection of equipment such as air conditioning equipment installed in the ceiling plenum 7. A cover 9 is provided on the underfloor inspection opening 1a, and the underfloor inspection opening 1a is configured to be openable and closable.

[0025] Preferably, a ladder 11 is provided on the lower side of the steel floor 1 for maintenance workers to access the ceiling plenum 7 from the underfloor inspection opening 1a. The lower end of the ladder 11 is installed on the ceiling of the dust-proof room 5, and the upper end of the ladder 11 is attached to an attachment member 13 provided on the steel floor 1. The cover 9, the ladder 11, and the attachment member 13 form the underfloor inspection opening structure 100 of the steel floor 1. The detailed structures of the cover 9, the ladder 11, and the attachment member 13 will be described later.

[0026] The steel floor 1 has perforated steel flooring material 20 as shown in Figure 2. As shown in Figure 3, the steel floor 1 is formed by laying multiple perforated steel flooring material 20 in a planar manner on top of multiple beam members 30 that are spaced apart from each other. Note that in Figure 3, for illustrative purposes only, only some of the perforated steel flooring material 20 and beam members 30 that make up the steel floor 1 are shown.

[0027] The perforated steel flooring material 20 is formed as a long, C-shaped steel material. The perforated steel flooring material 20 is formed by bending rolled steel material such as SS400, which has been surface-treated with hot-dip galvanizing, into a C-shape.

[0028] The perforated steel flooring material 20 has a long, rectangular planar section 20a, a pair of side sections 20b connected to the long side of the planar section 20a, and a pair of bottom sections 20c connected to each end of the pair of side sections 20b. The pair of side sections 20b are formed in a long, rectangular shape by extending approximately perpendicularly from the long side of the planar section 20a. The pair of bottom sections 20c are formed in a long, rectangular shape with gaps between them by extending in directions opposite to each other from each end of the pair of side sections 20b.

[0029] The flat section 20a forms the floor surface of the steel floor 1 by arranging perforated steel flooring material 20 in a grid or strip pattern. The flat section 20a has a plurality of oval-shaped elongated holes 20a1 arranged at intervals in the longitudinal direction. The elongated holes 20a1 are formed such that the diameter of the holes in the longitudinal direction of the flat section 20a is shorter than the diameter of the holes in the short direction of the flat section 20a.

[0030] The pair of side sections 20b form a connecting surface that allows adjacent perforated steel flooring materials 20 to be connected in the short direction. The pair of side sections 20b have a plurality of through holes 20b1 arranged in the long direction.

[0031] The pair of bottom portions 20c form a mounting surface that can be placed on the upper part of the beam member 30. The pair of bottom portions 20c have a plurality of through holes 20c1 arranged in the longitudinal direction.

[0032] The perforated steel flooring material 20 is laid on top of the beam members 30 such that the long direction of the perforated steel flooring material 20 faces the direction in which the beam members 30 are arranged. The perforated steel flooring material 20 is fastened and fixed to the beam members 30, for example, via fixing fittings (not shown) that clamp the bottom surface 20c and the top of the beam members 30.

[0033] The beam member 30 has a plurality of main beams 30a arranged at intervals. The main beams 30a are formed, for example, as H-shaped steel. The perforated steel floor material 20 is placed on top of two or more main beams 30a. Preferably, the longitudinal ends of the perforated steel floor material 20 are placed on the upper surface of the main beams 30a.

[0034] Furthermore, the beam member 30 preferably has one or more auxiliary beams 30b between adjacent main beams 30a, extending in the same direction as the main beams 30a and spaced apart from the main beams 30a. The auxiliary beams 30b are formed, for example, as L-shaped steel. When the beam member 30 has multiple auxiliary beams 30b, the auxiliary beams 30b are spaced apart from each other. Note that the beam member 30 may also have a configuration consisting only of multiple main beams 30a, and the auxiliary beams 30b may be omitted.

[0035] The underfloor inspection hatch 1a is formed by cutting away a portion of the steel floor 1, which consists of a part of the perforated steel floor material 20 arranged in a row in the extending direction of the beam member 30. As shown in Figure 3, the underfloor inspection hatch 1a is preferably formed between adjacent beam members 30. Alternatively, the underfloor inspection hatch 1a is preferably formed by cutting away and dividing a plurality of adjacent perforated steel floor material 20 at a predetermined distance from one end of the arranged perforated steel floor material 20. A cover 15 is provided at the cut portion 1a1 of the steel floor 1. Details of the cover 15 will be described later.

[0036] The cover 9 is formed using a perforated steel floor material piece 20-1, which is cut off from a portion of the steel floor 1. The perforated steel floor material piece 20-1 corresponds to the perforated steel floor material 20 in the aforementioned portion. The cover 9 is fitted into the underfloor inspection opening 1a. In Figure 3, for the purpose of clearly showing the position of the cover 9 on the steel floor 1, the elongated holes 20a1 are shown only in the region of the steel floor 1 that forms the cover 9, and the elongated holes 20a1 in other regions of the steel floor 1 are not shown.

[0037] Figure 4 is a perspective view showing a cover 9 in the underfloor inspection hatch structure of a steel floor. The cover 9 is equipped with fixing members (not shown) that connect a plurality of perforated steel floor material pieces 20-1 to each other. Fastening members such as bolts and nuts are used as fixing members. Adjacent perforated steel floor material pieces 20-1 are connected by fastening members through through holes 20b1 provided in the side portions 20b of the perforated steel floor material pieces 20-1, so that the opposing side portions 20b are fastened to each other.

[0038] Furthermore, the lid 9 is equipped with reinforcing members 17 that reinforce the perforated steel floor pieces 20-1 connected by the aforementioned fixing members. The reinforcing members 17 are formed in an elongated shape. As the reinforcing members 17, for example, a shaped steel such as an L-shaped angle steel with two rectangular planes and a plurality of elongated holes 17a formed therein can be used. The reinforcing members 17 span across the plurality of perforated steel floor pieces 20-1 and are positioned on the bottom surface 20c of the perforated steel floor pieces 20-1 corresponding to the underside surface of the lid 9. The reinforcing members 17 are connected to the plurality of perforated steel floor pieces 20-1 by fastening members such as bolts and nuts through the elongated holes 17a of the reinforcing members 17 and through holes 20c1 provided in the bottom surface 20c. Note that there may be only one reinforcing member 17 or there may be multiple reinforcing members, as shown in Figure 4.

[0039] Figures 5 and 6 are schematic diagrams showing the ladder mounting structure in the underfloor inspection hatch structure of a steel floor. As shown in Figure 5, the underfloor inspection hatch structure 100 of the steel floor 1 further includes a cover 15 that covers the cut-off portion 1a1 of the steel floor 1. The cover 15 is formed by bending a steel plate into an L-shape and is positioned to cover the cut-off portion 1a1 of the steel floor 1 from both the floor surface side and the underfloor inspection hatch 1a side. The cover 15 is connected to the steel floor 1 by screws or the like. Preferably, tape or the like is affixed to the floor surface side of the cover 15 as an identification mark indicating the position of the lid 9. For example, a warning tape with yellow and black stripes can be used as the tape. The underfloor inspection hatch structure 100 of the steel floor 1 preferably includes a support member 19 that supports the cover 9. The support member 19 is formed in an elongated shape. As the support member 19, for example, a shaped steel such as an angle steel with an L-shaped cross-section having two rectangular planes is used. The support member 19 extends along the cover 15, and both ends of the support member 19 are fixed to the lower part of the steel floor 1. For example, the support member 19 is connected to the bottom surface portion 20c of the perforated steel floor material 20 that forms the steel floor 1 by fastening members such as bolts and nuts.

[0040] The underfloor inspection hatch structure 100 of the steel floor 1 preferably includes a ladder 11 installed so as to extend downward from the underfloor inspection hatch 1a, and a mounting member 13 for attaching the ladder 11 to a support member 19. The ladder 11 has a pair of support columns 11a and a plurality of treads 11b connected between the pair of support columns 11a. The mounting member 13 has a pair of reinforcing parts 13a, a pair of hanging parts 13b connected to the pair of reinforcing parts 13a, a mounting part 13c connected between the pair of hanging parts 13b, and a pair of fixing parts 13d for fixing the ladder 11 to the mounting part 13c.

[0041] The pair of reinforcing sections 13a are formed, for example, as angle steel with three faces formed by an L-shaped plane and two rectangular planes. When the pair of reinforcing sections 13a are formed from L-shaped steel, the L-shaped faces in the direction of the corners of the L-shaped steel face each other, and one of the two rectangular planes hangs downward. The upper end of one of the two rectangular planes is connected to the support member 19 by fastening members such as bolts and nuts. The other rectangular plane is positioned to face the bottom surface 20c of the perforated steel floor material 20 that forms the steel floor 1, and is connected to the bottom surface 20c by fastening members such as bolts and nuts.

[0042] The pair of hanging sections 13b and mounting sections 13c are formed in an elongated shape. For example, the pair of hanging sections 13b and mounting sections 13c can be made of angle steel or other structural steel with an L-shaped cross-section having two rectangular planes. When the pair of hanging sections 13b are formed of angle steel, one of the two rectangular planes is connected to the reinforcing section 13a by fastening members such as bolts and nuts, and the upper end of the other is connected to the support member 19 by fastening members such as bolts and nuts. The mounting section 13c is positioned below the support member 19, spaced apart from it, and the elongated end of the mounting section 13c is connected to the pair of hanging sections 13b by fastening members such as bolts and nuts.

[0043] A pair of fixing parts 13d secure the ladder 11 to the mounting part 13c. For example, metal cable ties can be used as the fixing parts 13d. When the pair of fixing parts 13d are formed of metal cable ties, the ladder 11 is fixed in a state where it is suspended from the mounting part 13c by passing the cable ties through the space inside the lower part of the connection between the support column 11a and the uppermost rung 11b and the elongated hole in the mounting part 13c and fastening them together.

[0044] As described above, the underfloor inspection hatch structure 100 is formed by cutting away a portion of the steel floor 1, which consists of a portion of the perforated steel floor material 20 arranged in a row in the extending direction of the beam members 30, to form an underfloor inspection hatch 1a. The underfloor inspection hatch structure 100 also includes a cover 9, which is formed from a perforated steel floor material piece 20-1 corresponding to a portion of the perforated steel floor material 20, and is fitted into the underfloor inspection hatch 1a.

[0045] In the above configuration, since the cover 9 is made of perforated steel floor material piece 20-1, the weight of the cover 9 can be reduced. For example, if a conventional checkered steel plate cover is installed in the position shown in Figure 3, the weight of the conventional checkered steel plate cover is approximately 19 kg, whereas the total weight of the cover 9 in this configuration is approximately 7 kg. Therefore, with the above configuration, the effort required for workers to open and close the cover 9 can be reduced.

[0046] Furthermore, in the above configuration, the cover 9 can be fitted into the underfloor inspection opening 1a, thus eliminating the step between the steel floor 1 and the cover 9. Therefore, according to the above configuration, the walking of workers or the transport of work tools during inspection work can be made smoother.

[0047] Based on the above, the above configuration provides an underfloor inspection hatch structure 100 that can ensure the efficiency of inspection work by workers.

[0048] Furthermore, with the above configuration, the cover 9 can be formed using the detached perforated steel floor material pieces 20-1, thereby reducing the manufacturing cost of the underfloor inspection hatch structure 100.

[0049] Furthermore, the lid 9 preferably includes fixing members that connect a plurality of perforated steel floor material pieces 20-1 to one another.

[0050] According to the above configuration, a lid 9 in which multiple perforated steel floor material pieces 20-1 are integrated can be provided, eliminating the need to attach and detach the perforated steel floor material pieces 20-1 individually, thus further reducing the effort required for workers to open and close the lid. In addition, by integrating multiple perforated steel floor material pieces 20-1, it is possible to prevent the perforated steel floor material pieces 20-1 from falling from the underfloor inspection hatch 1a.

[0051] Furthermore, the cover 9 is preferably positioned across a plurality of perforated steel floor material pieces 20-1 and includes a reinforcing member 17 on the underside surface of the cover 9 that reinforces the perforated steel floor material pieces 20-1.

[0052] According to the above configuration, the height difference between multiple perforated steel floor material pieces 20-1 can be reduced, making it possible to further facilitate the walking of workers or the transport of work tools during inspection work.

[0053] Furthermore, the underfloor inspection hatch 1a is preferably formed between adjacent beam members 30.

[0054] With the above configuration, the underfloor inspection hatch 1a is not blocked by the beam 30, thus ensuring that there is sufficient space for workers to perform inspections.

[0055] Furthermore, the underfloor inspection hatch structure 100 of the steel floor 1 is further equipped with a cover 15 that covers the cut-off portion 1a1 of the steel floor 1.

[0056] According to the above configuration, the cut section 1a1 of the steel floor 1 is protected by the cover, preventing workers' fingers from touching the cut section 1a1, thus ensuring safety during inspection work.

[0057] Furthermore, the underfloor inspection hatch structure 100 preferably extends along the cover 15, with both ends fixed to the lower part of the steel floor 1, and includes support members 19 that support the lid 9.

[0058] With the above configuration, since the cover 9 is supported by the support member 19, the possibility of the cover 9 falling from the underfloor inspection hatch 1a can be further suppressed.

[0059] Furthermore, the underfloor inspection hatch structure 100 preferably further comprises a ladder 11 installed so as to extend downward from the underfloor inspection hatch 1a, and a mounting member 13 for attaching the ladder 11 to the support member 19.

[0060] According to the above configuration, the process of preparing and installing the ladder 11 each time maintenance and inspection of the equipment in the ceiling space 7 is performed can be omitted, thus further improving the efficiency of the workers' inspection work.

[0061] In the above-described embodiment, the underfloor inspection hatch structure 100 of the steel floor 1 was intended for the maintenance and inspection of equipment in the ceiling space 7 of the dustproof room 5, but it can also be used for other purposes. For example, the steel floor 1 may be formed as a helipad for helicopter takeoffs and landings, and the underfloor inspection hatch structure 100 may be intended for the maintenance and inspection of air conditioning equipment and the like housed beneath the steel floor 1. [Explanation of Symbols]

[0062] 1 Steel floor, 1a Underfloor inspection port, 1a1 Separation part, 3 Machine room, 5 Dust-proof room, 7 Attic space, 9 Lid body, 11 Ladder, 11a Support column, 11b Step piece, 13 Mounting member, 13a Reinforcement part, 13b Hanging part, 13c Mounting part, 13d Fixed part, 15 Cover, 17 Reinforcement member, 17a Long hole, 19 support member, 20 perforated steel flooring, 20-1 perforated steel flooring piece, 20a plane part, 20a1 long hole, 20b side part, 20b1 through hole, 20c bottom part, 20c1 through hole, 30 beam material, 30a main beam, 30b auxiliary beam, 100 underfloor inspection port structure.

Claims

1. A steel floor formed by laying multiple perforated steel flooring materials in a planar manner on top of multiple beam members arranged at intervals from each other, wherein a portion of the steel floor consisting of a part of the perforated steel flooring materials arranged in a row in the direction of extension of the beam members is cut away to form an underfloor inspection opening, It comprises a cover formed from the perforated steel flooring material in the aforementioned portion of the area and fitted into the underfloor inspection opening. Underfloor inspection hatch structure for steel floors.

2. The cover includes fixing members that connect a plurality of the perforated steel flooring materials in the aforementioned area to one another. The underfloor inspection hatch structure for a steel floor according to claim 1.

3. The cover is positioned across a plurality of perforated steel floor materials connected by the fixing members, and includes reinforcing members on the underside surface of the cover that reinforce the perforated steel floor materials. The underfloor inspection hatch structure for a steel floor according to claim 2.

4. The underfloor inspection hatch is formed between adjacent beam members. The underfloor inspection hatch structure for a steel floor according to any one of claims 1 to 3.

5. The steel floor is further provided with a cover that covers the cut portion. The underfloor inspection hatch structure for a steel floor according to any one of claims 1 to 3.

6. A support member extending along the cover, with both ends fixed to the lower part of the steel floor, and supporting the lid, A ladder is installed so as to extend downward from the underfloor inspection hatch, Mounting member for attaching the ladder to the support member and Furthermore, it is equipped with The underfloor inspection hatch structure for a steel floor according to claim 5.

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