Installation structure of communication equipment and construction method of communication equipment

Abstract

To provide an installation structure of communication equipment and a construction method of the communication equipment, capable of preventing breakage of access point equipment and reducing work in an underfloor pit in installation.SOLUTION: The structure includes a cushioning material 5 installed along a lower surface of a ceiling slab 21 of an underfloor pit 2, a leakage coaxial cable 3 laid on a lower side of the cushioning material 5 and pulled out above the ceiling slab 21 through the ceiling slab 21, and an access point device 4 installed above the ceiling slab 21 and connected with the leakage coaxial cable 3 pulled out above the ceiling slab 21.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an installation structure for communication facilities and a construction method for communication facilities. [Background technology]

[0002] BACKGROUND ART At construction sites and the like, a safety management system is known that performs safety management by communicating location information of workers and the like (see, for example, Patent Document 1). When adopting a safety management system such as the one described above in a pit under the floor of a concrete building, radio waves from the ground may not reach the building or may be interrupted, so access point equipment must be installed in the pit to ensure radio waves. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-85185 Summary of the Invention [Problem to be solved by the invention]

[0004] The inside of a subfloor pit is a highly humid environment due to the influence of the humidity in the surrounding soil and condensation on the concrete surface. Therefore, installing an access point device inside a subfloor pit poses a risk of damaging the access point device itself. Furthermore, installing or wiring an access point device in a subfloor pit requires a worker to enter the pit. Entering a subfloor pit requires prior inspection to check for the presence of oxygen, hydrogen sulfide, and other gases, and to replace the air in the pit, which is time-consuming and labor-intensive. Furthermore, if only qualified personnel capable of safety management are allowed to enter a subfloor pit, securing personnel is a significant effort.

[0005] Therefore, an object of the present invention is to provide a communication equipment installation structure and a communication equipment construction method that can prevent damage to access point equipment and reduce the amount of work required in an underfloor pit during installation. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the communication equipment installation structure of the present invention comprises a buffer material installed along the underside of the ceiling slab of an underfloor pit, a leaky coaxial cable laid under the buffer material and passing through the ceiling slab and pulled out above the ceiling slab, and an access point device installed above the ceiling slab and to which the leaky coaxial cable pulled out above the ceiling slab is connected.

[0007] In order to achieve the above-mentioned object, the construction method for communication equipment of the present invention comprises: a formwork installation process for installing a formwork for a ceiling slab of an underfloor pit; a leaky coaxial cable installation process for laying a leaky coaxial cable along the bottom surface of the formwork and pulling it out above the ceiling slab that will be constructed later; a buffer material installation process for installing buffer material along the bottom surface of the formwork so as to cover from above the leaky coaxial cable laid along the bottom surface of the formwork; a ceiling slab construction process for constructing the ceiling slab by pouring concrete for the ceiling slab above the buffer material in the formwork; and a connection process for installing an access point device above the ceiling slab and connecting the leaky coaxial cable pulled out above the ceiling slab to the access point device.

[0008] In the present invention, the leaky coaxial cable is installed below the ceiling slab via a buffer material. Therefore, when constructing the ceiling slab of the underfloor pit, the leaky coaxial cable is laid on the bottom of the formwork for the ceiling slab, buffer material is placed on top of it, and concrete is poured on top of the buffer material in the formwork and then demolded, leaving the leaky coaxial cable laid below the ceiling slab. Therefore, after the ceiling slab and the underfloor pit are constructed, there is no need to lay the leaky coaxial cable inside the underfloor pit, and work inside the underfloor pit when installing communication equipment can be reduced. Because the leaky coaxial cable is pulled out above the ceiling slab, the access point equipment can be installed above the ceiling slab, and there is no need to install it inside the underfloor pit. This means that the access point equipment will not be damaged by moisture inside the underfloor pit. Since there is no need to install the access point equipment inside the underfloor pit, work inside the underfloor pit when installing communication equipment can be reduced. Since there is less need to enter the underfloor pit to install communication equipment, there is no need for advance preparation or restrictions on entering the underfloor pit, which reduces labor and makes it easier to secure personnel. During construction of a building where communication equipment is to be installed, the formwork on the ceiling slab above the floor pit is removed, and a leaky coaxial cable is connected to an access point device above the ceiling slab, maintaining a communication environment in the floor pit even during construction. Therefore, by installing cameras, measuring instruments, drones, and other devices with communication capabilities in the floor pit and using these devices to manage construction from above, the number of times and the amount of time workers need to enter the pit for construction management can be reduced. When workers work in the floor pit, their safety can be confirmed by communicating with them from outside the pit or by checking images from the floor pit camera. The same applies to building completion inspections. Furthermore, maintenance of the access point devices and the connections between the leaky coaxial cables and the access point devices can be performed without entering the underfloor pit. This makes it easy to check the connections between the access point devices and the leaky coaxial cables, allowing for quick recovery in the event of a malfunction. By providing a buffer between the ceiling slab and the leaky coaxial cable, the leaky coaxial cable laid in the underfloor pit is not buried in the concrete of the ceiling slab. This means that radio waves leaking from the leaky coaxial cable are not blocked by the concrete, improving radio wave transmission and improving the communication environment in the underfloor pit. Furthermore, because a gap is created between the ceiling slab and the leaky coaxial cable, radio waves leaking from the leaky coaxial cable are prevented from reflecting off the ceiling slab, improving the communication environment in the underfloor pit.

[0009] In the communication equipment installation structure according to the present invention, the buffer material may be a heat insulating material.

[0010] This configuration prevents moisture in the underfloor pit from rising above the ceiling slab, thereby preventing damage to the access point device due to moisture in the underfloor pit.

[0011] In the communication equipment installation structure according to the present invention, the leaky coaxial cable may be supported by a hanger fixed to the ceiling slab.

[0012] With this configuration, the leaky coaxial cable can be maintained in a state where it is laid below the ceiling slab.

[0013] In the communication equipment installation structure of the present invention, the suspension device may penetrate the buffer material in the vertical direction, with the upper side embedded in the concrete of the ceiling slab and the leaky coaxial cable attached to the lower side.

[0014] With this configuration, even if a buffer material is provided between the leaky coaxial cable and the ceiling slab, the ceiling slab can reliably support the leaky coaxial cable, preventing the leaky coaxial cable from coming loose. [Effects of the Invention]

[0015] According to the present invention, damage to access point devices can be prevented and the amount of work required in underfloor pits during installation can be reduced. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a vertical cross-sectional view of a building in which communication equipment according to an embodiment is installed. [Figure 2] FIG. 1 is a plan view showing the installation of a leaky coaxial cable. [Figure 3] 1 is a schematic perspective view showing a communication facility according to an embodiment; [Figure 4] FIG. 2 is a detailed diagram of the installation structure of the communication equipment according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a communication facility installation structure and a communication facility construction method according to an embodiment of the present invention will be described with reference to FIGS. As shown in Figures 1 and 2, the installation structure for communications equipment according to this embodiment is an installation structure for communications equipment 1 for communication inside and outside an underfloor pit 2 of a building. The underfloor pit 2 is provided underground. The floor, walls, and ceiling of the underfloor pit 2 are constructed of concrete. A ceiling slab 21 provided on the ceiling of the underfloor pit 2 is provided with an entrance / exit 22 that allows communication to and from the ground floor. In Figure 2, the ceiling slab 21 is omitted to show the interior of the underfloor pit 2. In Figure 2, the leaky coaxial cable 3 of the communications equipment 1 is indicated by a dashed line. The construction method for communications equipment according to this embodiment is the construction method for the above-mentioned communications equipment 1. In the construction method for communications equipment according to this embodiment, the communications equipment 1 is constructed together with the construction of the ceiling slab 21 (ceiling slab construction process).

[0018] As shown in FIGS. 3 and 4, the communication facility 1 includes a leaky coaxial cable 3, an access point device 4, a buffer material 5, a first conduit 6, and a second conduit 7 (see FIG. 4). The leaky coaxial cable 3 is a cable that leaks weak radio waves, and is laid to improve wireless LAN communication in areas where radio waves are difficult to reach, such as underfloor pits 2. The leaky coaxial cable 3 is laid below the ceiling slab 21 (see Figure 4) and is also drawn out above the ceiling slab 21. The access point device 4 is installed above the ceiling slab 21, and the leaky coaxial cable 3 drawn out above the ceiling slab is connected to it via a distributor 9. The distributor 9 is also installed above the ceiling slab 21. The area above the ceiling slab 21 is a space that is easily accessible to workers.

[0019] As shown in FIG. 4 , the buffer material 5 is provided along the underside 21a of the ceiling slab 21. The buffer material 5 is a heat insulating material. The buffer material 5 is, for example, Styrofoam (registered trademark) made of polystyrene resin. The buffer material 5 is permeable to radio waves leaked from the leaky coaxial cable 3. The leaky coaxial cable 3 is provided below the buffer material 5. The leaky coaxial cable 3 is supported on the ceiling slab 21 by a hanger 8 fixed to the ceiling slab 21. The hanger 8 is, for example, a wire such as a binding wire or a band made of polypropylene called a PP band, which is used for packaging. The hanger 8 of this embodiment penetrates the buffer material 5 in the vertical direction, and its upper side is embedded in the concrete 23 of the ceiling slab 21, with the leaky coaxial cable 3 attached to its lower side. The leaky coaxial cable 3 and the ceiling slab 21 are not in direct contact. A predetermined gap is formed between the leaky coaxial cable 3 and the ceiling slab 21 by the buffer material 5.

[0020] The first conduit 6 and the second conduit 7 are, for example, flexible conduits (CD pipes) made of synthetic resin. The first conduit 6 is a half-split material made by splitting a CD pipe vertically in half along its axial direction to form an arc-shaped surface. The first conduit 6 covers from above the portion of the leaky coaxial cable 3 that is laid below the ceiling slab 21. The first conduit 6 is arranged between the leaky coaxial cable 3 and the buffer material 5. The underside of the leaky coaxial cable 3 is not covered by the first conduit 6 and is exposed to the internal space of the underfloor pit 2. In other words, nothing is arranged below the leaky coaxial cable 3 to prevent it from emitting radio waves into the underfloor pit 2.

[0021] The second conduit 7 is not split like the first conduit 6 and is tubular. The portion of the leaky coaxial cable 3 that penetrates the ceiling slab 21 and is pulled out above the ceiling slab 21 is inserted into the second conduit 7. The second conduit 7 is a void pipe buried in the concrete 23 of the ceiling slab 21. Because the leaky coaxial cable 3 is inserted into the second conduit 7, it is not in direct contact with the concrete 23 of the ceiling slab 21.

[0022] As described above, the communication equipment 1 of this embodiment is installed together with the construction of the ceiling slab 21. The construction method of the communication equipment and the construction method of the ceiling slab 21 will be described together. First, the formwork 24 for the ceiling slab 21 is installed (formwork installation process). The bottom plate 241 and side plates of the formwork 24 are installed. The formwork 24 and the bottom plate 241 are shown by dashed lines in Fig. 4 at positions where the formwork 24 and the bottom plate 241 are temporarily installed. The leaky coaxial cable 3 is laid along the bottom surface 24a of the formwork 24 (the upper surface of the bottom plate 241), and is pulled out to above the ceiling slab 21 that will be constructed later (leaky coaxial cable laying process). The portion of the leaky coaxial cable 3 that is laid along the bottom surface 24a of the formwork 24 is covered from above with a first conduit 6. A hanger 8 is attached to the portion of the leaky coaxial cable 3 that is laid along the bottom surface 24a of the formwork 24. The hanger 8 is positioned so that the upper side of the hanger 8 is embedded in the concrete 23 of the ceiling slab 21. The portion of the leaky coaxial cable 3 that penetrates the ceiling slab 21 is inserted into the first conduit 6.

[0023] The buffer material 5 is installed along the bottom surface 24a of the formwork 24 so as to cover from above the first conduit 6 that covers the portion of the leaky coaxial cable 3 laid along the bottom surface 24a of the formwork 24 (buffer material installation process). The buffer material 5 is installed over the entire bottom surface 24a of the formwork 24. Concrete 23 for the ceiling slab 21 is poured above the buffer material 5 in the formwork 24 (concrete pouring step). Once the concrete 23 has hardened, the formwork 24 is removed (form removal process). By removing the bottom plate 241 of the formwork 24, the leaky coaxial cable 3 is exposed inside the underfloor pit 2. The access point device 4 is installed above the ceiling slab 21, and the leaky coaxial cable 3 is connected to the access point device 4 above the ceiling slab 21 (access point device connecting step).

[0024] Next, the functions and effects of the communication equipment installation structure and communication equipment construction method according to this embodiment will be described. In the communication equipment installation structure and communication equipment construction method according to this embodiment, the leaky coaxial cable 3 is installed below the ceiling slab 21 via a buffer material 5. Therefore, when constructing the ceiling slab 21 of the underfloor pit 2, the leaky coaxial cable 3 is laid on the bottom plate 241 of the formwork 24 of the ceiling slab 21, the buffer material 5 is placed on top of it, and concrete 23 is poured on top of the buffer material 5 in the formwork 24 and then demolded, so that the leaky coaxial cable 3 is laid below the ceiling slab 21. Therefore, after the ceiling slab 21 is constructed and the underfloor pit 2 is constructed, there is no need to perform work to lay the leaky coaxial cable 3 inside the underfloor pit 2, and work inside the underfloor pit when installing communication equipment can be reduced.

[0025] Because the leaky coaxial cable 3 is pulled out above the ceiling slab 21, the access point device 4 can be installed above the ceiling slab 21, and there is no need to install the access point device 4 inside the underfloor pit 2. This prevents the access point device 4 from being damaged by moisture inside the underfloor pit 2, and eliminates the need to install the access point device 4 inside the underfloor pit 2, reducing the amount of work inside the underfloor pit when installing communications equipment. Since there is less need to enter the underfloor pit 2 to install communications equipment 1, there is no need for prior preparations or restrictions on entering the underfloor pit 2, reducing labor and making it easier to secure personnel.

[0026] During construction of a building in which the communication equipment 1 is to be installed, the formwork 24 of the ceiling slab 21 is removed and the leaky coaxial cable 3 is connected to the access point device 4, thereby establishing a communication environment in the underfloor pit 2 even during construction. For this reason, by installing devices such as cameras, measuring instruments, and drones with communication capabilities in the underfloor pit 2 and using these devices to manage the construction of the underfloor pit 2 from above, the number of times and the amount of time that workers need to enter the underfloor pit 2 for construction management can be reduced. When a worker works in the underfloor pit 2, the worker's safety can be confirmed by communicating with the worker from outside the underfloor pit 2 or by checking images from the camera in the underfloor pit 2. The same applies to the completion inspection of a building.

[0027] Furthermore, maintenance related to the access point device 4 and the connection between the leaky coaxial cable 3 and the access point device 4 can also be performed without entering the underfloor pit 2. Since the connection between the access point device 4 and the leaky coaxial cable 3 and the access point device 4 can be easily checked, recovery can be made quickly even if a malfunction occurs.

[0028] By providing buffer material 5 between the ceiling slab 21 and the leaky coaxial cable 3, the leaky coaxial cable 3 laid in the underfloor pit 2 is not buried in the concrete 23 of the ceiling slab 21. This means that radio waves leaking from the leaky coaxial cable 3 are not blocked by the concrete 23, improving radio wave transmission and improving the communication environment in the underfloor pit 2. Furthermore, because a gap is created between the ceiling slab 21 and the leaky coaxial cable 3, radio waves leaking from the leaky coaxial cable 3 can be prevented from being reflected by the ceiling slab 21, improving the communication environment in the underfloor pit 2.

[0029] In this embodiment, the buffer material 5 is a heat insulating material. This configuration can prevent moisture in the underfloor pit 2 from rising above the ceiling slab 21, thereby preventing the access point device 4 from being damaged by moisture in the underfloor pit 2.

[0030] In this embodiment, the leaky coaxial cable 3 is supported by a hanger 8 fixed to the ceiling slab 21. With this configuration, the leaky coaxial cable 3 can be maintained in a state where it is laid below the ceiling slab 21.

[0031] In this embodiment, the hanger 8 penetrates the buffer material 5 in the vertical direction, with its upper side buried in the concrete 23 of the ceiling slab 21 and the leaky coaxial cable 3 attached to its lower side. With this configuration, even if a buffer material is provided between the leaky coaxial cable 3 and the ceiling slab 21, the ceiling slab 21 can reliably support the leaky coaxial cable 3, and the leaky coaxial cable 3 can be prevented from coming loose.

[0032] The above describes embodiments of the communication equipment installation structure and communication equipment construction method according to the present invention, but the present invention is not limited to the above embodiments and can be modified as appropriate within the scope of the spirit thereof. For example, in the above embodiment, the buffer material 5 is a heat insulating material, but it may be a material or member other than a heat insulating material as long as it can prevent the ceiling slab 21 and the leaky coaxial cable 3 from coming into contact with each other. In the above embodiment, the leaky coaxial cable 3 is supported by a hanger 8 fixed to the ceiling slab 21, but the form of supporting the leaky coaxial cable 3 so that it is positioned below the ceiling slab 21 may be a form other than providing a hanger 8. In the above embodiment, the leaky coaxial cable 3 is covered by the first conduit 6 and inserted into the second conduit 7 for protection, but the leaky coaxial cable 3 may be protected in a manner other than the above.

[0033] The leaky coaxial cable 3 is connected to a distributor 9, which is then connected to an access point device 4. It is desirable that the distributor 9 be a distributor that supports redundancy. By doing so, even if communication over the leaky coaxial cable 3 becomes impossible while someone is standing in the underfloor pit 2, it is possible to communicate with people in the underfloor pit 2 and to ensure safety management of the underfloor pit 2.

[0034] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The communication equipment installation structure and communication equipment construction method according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 12: Responsible Consumption and Production. [Explanation of symbols]

[0035] 2 Underfloor pit 3. Leaky coaxial cable 4. Access point devices 5 Cushioning material 8 Lifting equipment 21 Ceiling slab 21a Bottom side 24 Formwork

Claims

1. A buffer material installed along the underside of the ceiling slab of the underfloor pit; a leaky coaxial cable that is laid under the buffer material and that penetrates the ceiling slab and is drawn out above the ceiling slab; an access point device that is installed above the ceiling slab and to which the leaky coaxial cable that is pulled out above the ceiling slab is connected.

2. 2. The communication equipment installation structure according to claim 1, wherein the buffer material is a heat insulating material.

3. 3. The communication facility installation structure according to claim 1, wherein the leaky coaxial cable is supported by a hanger fixed to the ceiling slab.

4. 4. The communication equipment installation structure according to claim 3, wherein the suspension device penetrates the buffer material in the vertical direction, the upper side is embedded in the concrete of the ceiling slab, and the leaky coaxial cable is attached to the lower side.

5. A formwork installation process involves installing formwork for the ceiling slab of the underfloor pit; a leaky coaxial cable laying step of laying a leaky coaxial cable along the bottom surface of the formwork and pulling it out above the ceiling slab to be constructed later; a buffer material installation step of installing a buffer material along the bottom surface of the formwork so as to cover from above the leaky coaxial cable laid along the bottom surface of the formwork; a ceiling slab construction process in which concrete for the ceiling slab is poured above the buffer material in the formwork to construct the ceiling slab; a connection step of installing an access point device above the ceiling slab and connecting the leaky coaxial cable drawn out above the ceiling slab to the access point device.

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