Communication system for ultra-high rise building

Abstract

To provide a communication system for an ultra-high rise building capable of supplying stable communication within the ultra-high rise building.SOLUTION: A communication system for an ultra-high rise building includes a connection unit that connects to wired communication from the ground, a first wireless communication network that connects to the connection unit via wired or wireless communication and supplies wireless communication to a lower part of the building under construction, a receiving unit that is installed on a tower crane that is installed as a lifting machine at an upper part of the building and receives wireless communication, and a second wireless communication network that connects to the receiving unit and supplies wireless communication to the upper part of the building.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a communication system for a super high rise building. [Background technology]

[0002] In recent years, ultra-high rise buildings exceeding 100m, 200m, or 400m have been constructed. When constructing such ultra-high rise buildings, multiple tower cranes are usually installed on the top of the building, and operators who operate the tower cranes lift building materials, etc., temporarily placed on the ground, to the construction floor. At this time, the operators proceed with tasks such as rigging, lifting, and removing the rigging while communicating with workers positioned on the ground and on the construction floor using a communication system.

[0003] Conventionally, wired communication has been used as a communication system between operators and workers on the ground and on the construction floors. However, wired communication requires laying communication cables from the ground, and there is an issue that even on lower floors where construction is almost complete, some work remains to be done.

[0004] For this reason, in recent years, wireless communication has been increasingly adopted as a communication system that can be used between operators and workers on the ground and on construction floors.

[0005] According to Non-Patent Document 1, a simulation result shows that communication is possible up to 280 m above the ground in each frequency band (920 MHz band, 2.4 GHz band) used by tower cranes. In this simulation, a communication cable is drawn from the first floor above ground to the top of the tower crane under construction, and is attached to a communication device installed on the swivel base (movable rotating part) of the tower crane. This communication device then supplies wireless communication via an antenna facing upward and an antenna facing downward. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] Simulation of radio wave propagation between the top and bottom of a tower crane using the 920MHz band (https: / / www.google.com / url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjo5KuO442CAxWph1YBHdqtByIQFnoECBMQAQ&url=https%3A%2F%2Fwww.tokyu-cnst.co.jp%2Ftechnology%2Flab%2Freport%2Fpdf%2FNo44-21.pdf&usg=AOvVaw0u5dUkBeCLXZuY1QKrHmQs&opi=89978449) [Non-Patent Document 2] PicoCELA, Toda Construction, Furuno Electric Successfully conducts a system demonstration experiment using a waveguide backhaul method to create a wireless environment on the upper floors of a high-rise building (https: / / prtimes.jp / main / html / rd / p / 000000037.000035736.html) [Non-Patent Document 3] PicoCELA and Nishimatsu Construction have succeeded in creating a practical Wi-Fi environment at a construction site in a 30-story high-rise building. Nishimatsu Construction has begun introducing the technology to its construction sites. (https: / / prtimes.jp / main / html / rd / p / 000000025.000035736.html?_fsi=k9l6eObX) Summary of the Invention [Problem to be solved by the invention]

[0007] However, it has been confirmed during actual work at construction sites that communication is prone to go undetected at heights of around 100m to 200m or more. This is because attenuation occurs due to the extension length of the communication cable at heights of over 100m above ground level.

[0008] In addition, commercially available communication devices used for wireless communication have limitations in the distance that radio waves can be transmitted and received, so multiple relays (hops) are required to communicate wirelessly between the operator and the ground and construction floors.

[0009] When wireless communication is relayed, the radio waves attenuate with each relay, so the maximum number of relays that communication can be performed is about eight hops. Furthermore, the longest distance that can be transmitted and received with commercially available communication devices is 28 meters. Therefore, in ultra-high-rise buildings that are about 100 to 200 meters or more tall, communication goes undetected, and there is an issue that wireless communication cannot be provided to the entire building.

[0010] Furthermore, even when wireless communication is adopted, it is necessary to pull electric wires from above ground to supply power to the communication equipment, which poses the issue that even on the lower floors of a building under construction where work has been almost completed, some work still remains to be done.

[0011] These issues are based on experience that, when ultra-high rise buildings reach a certain height, radio wave noise caused by reflections becomes significant, and that radio wave noise becomes noticeable once the building exceeds a certain height.

[0012] The present invention has been made in consideration of the above, and aims to provide a communication system for an ultra-high rise building that can provide stable communications within an ultra-high rise building at a height where communications cannot be detected (for example, approximately 100 m to 200 m or more). [Means for solving the problem]

[0013] In order to solve the above-mentioned problems and achieve the objectives, a communication system for an ultra-high rise building according to one embodiment of the present invention comprises a connection unit that connects to wired communication from the ground, a first wireless communication network that is connected to the connection unit via wired or wireless communication and supplies wireless communication to the lower part of the building under construction, a receiving unit that is installed on a tower crane that is installed as a lifting machine at the upper part of the building and receives wireless communication, and a second wireless communication network that is connected to the receiving unit and supplies wireless communication to the upper part of the building.

[0014] In addition, in a communication system for an ultra-high rise building according to one aspect of the present invention, the receiving unit receives wireless communication from a communication satellite.

[0015] In addition, in a communication system for an ultra-high rise building according to one aspect of the present invention, the receiving unit receives wireless communication transmitted from the ground.

[0016] In addition, in a communication system for an ultra-high rise building according to one embodiment of the present invention, the receiving unit receives wireless communication in a frequency band of 800 MHz or higher.

[0017] In addition, in a communication system for an ultra-high rise building according to one embodiment of the present invention, the first wireless communication network supplies wireless communication to an area of ​​the building where the height of the building is equal to or lower than a height at which communication cannot be detected, and the second wireless communication network supplies wireless communication to an area of ​​the building where the height of the building is equal to or higher than a height at which communication cannot be detected.

[0018] In addition, in a communication system for a super-high rise building according to one embodiment of the present invention, the first wireless communication network and the second wireless communication network include multiple wireless access points arranged within a distance of 28 m from each other.

[0019] In addition, a communication system for an ultra-high rise building according to one embodiment of the present invention includes solar panels installed on the tower crane, a storage battery that stores power from the solar panels, and a switching unit that supplies power from the storage battery to the receiving unit and the second wireless communication network when power supply to the tower crane from the ground is stopped.

[0020] In addition, in a communication system for an ultra-high rise building according to one embodiment of the present invention, the solar panel is attached to a side wall or ceiling of the operator's seat of the tower crane. Effect of the Invention

[0021] According to the present invention, it is possible to realize a communication system for an ultra-high rise building that can provide stable communications within the ultra-high rise building. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a communication system for an ultra-high rise building according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of the first system. [Diagram 3] FIG. 3 is a schematic diagram showing the configuration of the second system. [Figure 4] FIG. 4 is a perspective view of a tower crane. [Diagram 5] Figure 5 is a top view of a super high-rise building. [Figure 6] FIG. 6 is a perspective view of a tower crane according to the first modification. [Figure 7] FIG. 7 is a perspective view of a tower crane according to the second modification. [Figure 8] FIG. 8 is a diagram showing the layout of wireless access points on the transmitting and receiving sides. [Figure 9] FIG. 9 is a view of FIG. 8 seen from above. [Figure 10] FIG. 10 is a diagram showing the communication result. [Figure 11] FIG. 11 is a diagram illustrating an example of a transmission / reception path. [Figure 12] FIG. 12 is a layout diagram of the transmitting unit and the receiving unit. [Figure 13] FIG. 13 is a diagram showing the communication result. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, embodiments of the communication system for a super-high rise building according to the present invention will be described with reference to the drawings. Note that the present invention is not limited to these embodiments. The present invention can be generally applied to communication systems for super-high rise buildings.

[0024] In addition, in the drawings, the same or corresponding elements are appropriately labeled with the same reference numerals. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of each element may differ from the actual situation. The drawings may also include parts with different dimensional relationships and ratios.

[0025] [Configuration of communication system] (Embodiment) Fig. 1 is a schematic diagram showing the configuration of a communication system for an ultra-high rise building according to an embodiment. As shown in Fig. 1, the communication system 1 according to the embodiment provides communication to workers and staff in an ultra-high rise building 2 under construction. A tower crane 3 is installed on the top of the ultra-high rise building 2 as a lifting machine for lifting building materials and the like temporarily placed on the ground up to the construction floor. The ultra-high rise building 2 is, for example, at a height at which communication cannot be detected, and is an ultra-high rise building of about 100 m, about 200 m, or about 400 m or more.

[0026] The communication system 1 provides communications to workers and staff in an ultra-high rise building 2 under construction via two systems, a first system S1 and a second system S2.

[0027] Fig. 2 is a schematic diagram showing the configuration of the first system. As shown in Fig. 2, the first system S1 includes a wireless access point WAP as a connection part for connecting to wired communication from a ground line lead-in part 4 on the ground, and a plurality of wireless access points WAP as a first wireless communication network that is connected to the wireless access point WAP by wired or wireless communication and supplies wireless communication to the lower part of the building under construction. Communication between the wireless access points WAP is connected by wireless communication in a frequency band of, for example, 2.4 GHz or 5 GHz. These wireless access points WAP are arranged so as to be within 28 m of each other, and supply wireless communication to an area of ​​the building below the height where communication cannot be detected.

[0028] Fig. 3 is a schematic diagram showing the configuration of the second system. As shown in Fig. 3, the second system S2 includes an antenna ANT and a router RT as a receiver for receiving wireless communication, and a plurality of wireless access points WAP as a second wireless communication network that is connected to the router RT and supplies wireless communication to the upper part of the building. The communication received by the antenna ANT is taken in by the router RT in the driver's seat 31, and the communication is supplied to each wireless access point WAP of the second system S2. The communication between the wireless access points WAP is connected by wireless communication in a frequency band of, for example, 2.4 GHz or 5 GHz. These wireless access points WAP are arranged so as to be within 28 m of each other, and supply wireless communication to an area where the building is at a height above which communication cannot be detected.

[0029] The antenna ANT receives wireless communication from the communication satellite 5, but may also receive wireless communication transmitted from a transmitter installed on the ground. The frequency band of this wireless communication is, for example, 800 MHz or higher, but may be 10.7 to 12.7 GHz or 920 MHz.

[0030] Fig. 4 is a perspective view of a tower crane. As shown in Fig. 4, the antenna ANT is installed on a guy support 32 located above the driver's seat 31 of the tower crane 3. The location where the antenna ANT is installed is not particularly limited, but it is preferable to install it in a position where it does not interfere with the boom of the tower crane 3 when it rotates.

[0031] Fig. 5 is a diagram of an ultra-high rise building seen from above. As shown in Fig. 5, when the floor area of ​​each floor of the ultra-high rise building 2 is large, it is preferable to place multiple wireless access points WAP on the same floor so that the distance between each of them is within 28 m.

[0032] According to the embodiment described above, wireless communication from ground wired communication is provided to areas of the building where the building height is equal to or lower than the height where communication is undetectable, and wireless communication from ground or communication satellite is provided to areas of the building where the building height is equal to or higher than the height where communication is undetectable, thereby making it possible to provide stable communication in an ultra-high rise building where the building height exceeds the height where communication is undetectable. As a result, the operator of the tower crane 3 can carry out work such as rigging, lifting, and removing the rigging while communicating with workers positioned on the ground and on the construction floor using the communication system 1.

[0033] (Variation 1) Fig. 6 is a perspective view of a tower crane according to the first modification. As shown in Fig. 6, a solar panel 33A is attached to the side wall of the driver's seat 31 of the tower crane 3A. Inside the driver's seat 31, a storage battery that stores power from the solar panel 33A and a switching unit that supplies power from the storage battery to the second system S2 (antenna ANT, router RT, and multiple wireless access points WAP) when power supply from the ground to the tower crane 3A is stopped are installed. As a result, communication can be provided to workers and staff in the upper part of the super high-rise building 2 even during a power outage.

[0034] The solar panel 33A may be a silicon solar cell, a perovskite solar cell, a compound solar panel, an organic solar panel, an organic / inorganic hybrid solar panel, or other structure, and is not limited in type or structure. Also, solar panels of different types and structures may be used in combination.

[0035] In addition, power from the solar panel 33A may be constantly supplied to the second system S2 (the antenna ANT, the router RT, and the multiple wireless access points WAP). In this case, the wires for supplying power can also be laid from above, which improves work efficiency.

[0036] (Variation 2) Fig. 7 is a perspective view of a tower crane according to Modification 2. As shown in Fig. 7, a solar panel 33B is attached to the ceiling of the driver's seat 31 of the tower crane 3B. As a result, as in Modification 2, communication can be provided to workers and staff in the upper part of the ultra-high rise building 2 even during a power outage.

[0037] [Communication test between wireless access points] In the communication system 1, the distance between each wireless access point WAP was set to within 28 m. Here, the results of a communication test in which transmission and reception were performed in an actual building will be described. The communication test between the wireless access points WAP was performed at both 2.4 GHz and 5 GHz.

[0038] Fig. 8 is a layout diagram of the wireless access points on the transmitting side and the receiving side. As shown in Fig. 8, an actual building was treated as a virtual super-high rise building 2, and multiple wireless access points WAP shown at positions (1) to (7) were placed in this super-high rise building 2, and a communication test was conducted. Fig. 8 illustrates the height direction position from the floor line (B1FL) of the first basement floor of the super-high rise building 2 to the heliport, the positions (1) and (2) of the wireless access points WAP on the transmitting side, and the positions (3) to (7) of the wireless access points WAP on the receiving side. The super-high rise building 2 also has two atriums, an east atrium EA and a west atrium WA.

[0039] Figure 9 is a top view of Figure 8. The top row of Figure 9 shows all of the wireless access points WAP positions (1) to (7), and below that are the wireless access points WAP positions (1) to (7) on the heliport, rooftop, first floor floor line (1FL), and basement floor floor line (B1FL).

[0040] Figure 10 shows the communication results. Figure 10 shows the location of the wireless access point WAP on the sending side, the location of the wireless access point WAP on the receiving side, and the reception results between those wireless access points WAP. As a result, the reception results showed reception possible (◯) in all communication tests for 2.4 GHz and 5 GHz.

[0041] FIG. 11 is a diagram showing an example of a transmission / reception path. The distance from position (1) to position (6) of the wireless access point WAP shown in FIG. 11 is the longest path. In this path, the horizontal distance is 27 m at the top (height of the heliport) and 13 m at the bottom (height of the first floor). The vertical distance is 33.6 m. Furthermore, this path also passes through a reinforced concrete wall. Therefore, it was shown that if the distance between the wireless access points WAP is within 28 m, as set in this communication system 1, communication is sufficiently possible at both 2.4 GHz and 5 GHz.

[0042] [Communication test up to antenna] A communication test was conducted in which wireless communication transmitted from a transmitter installed on the ground was received by the antenna ANT of tower crane 3. The frequency band for wireless communication was 920 MHz.

[0043] Fig. 12 is a layout diagram of the transmitting unit and the receiving unit. Fig. 12 also illustrates the positions of the transmitting unit, the receiving unit, and the measuring device that measures distance. In this communication test, the horizontal distance between the transmitting unit and the receiving unit was measured using a measuring device, and the communication test was performed. The measured horizontal distances were 367m, 268m, and 164m. There were cases where there was a vehicle between the transmitting unit and the receiving unit, which acted as a barrier to communication, and cases where there was not.

[0044] Figure 13 shows the communication results. As shown in Figure 13, at distances of 367m, 268m, and 164m, the start times were synchronized and a 1 minute or 30 second video was started at the same time at the transmitting and receiving units, and the delay time that occurred during that measurement time was measured three times. As a result, regardless of the presence or absence of a vehicle barrier, the delay time was about 1 second, indicating that communication with sufficiently little delay was possible.

[0045] As described above, it was demonstrated by the communication test that wireless communication is possible within a distance of 28 m between wireless access points WAP, and wireless communication is possible up to 367 m between the tower crane 3 and the ground. Therefore, it was demonstrated that wireless communication can be provided to the entire building by the communication system 1 shown in the embodiment in an ultra-high rise building, which exceeds the height at which communication cannot be detected.

[0046] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Thus, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0047] 1. Communication Systems 2. Ultra-high rise buildings 3, 3A, 3B Tower Crane 4. Ground line entrance 5. Communications Satellites 31 Driver's seat 32 Guy Support 33A, 33B Solar panels ANT Antenna EA East Atrium RT Router S1 1st system S2 2nd system WA West Atrium WAP Wireless Access Point

Claims

1. a connection part for connecting to wired communication from the ground; a first wireless communication network connected to the connection unit by wire or wireless communication and supplying wireless communication to a lower portion of the building under construction; a receiving unit that is installed on a tower crane that is installed as a lifting machine on the upper part of the building and receives wireless communication; a second wireless communication network connected to the receiving unit and supplying wireless communication to the upper portion of the building; A communications system for an ultra-high rise building.

2. The communication system for an ultra-high rise building according to claim 1 , wherein the receiving section receives wireless communication from a communication satellite.

3. The communication system for an ultra-high rise building according to claim 1 , wherein the receiving section receives wireless communication transmitted from the ground.

4. The communication system for an ultra-high rise building according to claim 1 , wherein the receiving section receives wireless communication in a frequency band of 800 MHz or more.

5. The first wireless communication network provides wireless communication to an area where the building height is equal to or less than a height at which communication cannot be detected, The communication system of claim 1 , wherein the second wireless communication network supplies wireless communication to an area of ​​the building where the height of the building is equal to or greater than a height at which communication cannot be detected.

6. The communication system for an ultra-high rise building according to claim 1 , wherein the first wireless communication network and the second wireless communication network include a plurality of wireless access points arranged within a distance of 28 m from each other.

7. Solar panels installed on the tower crane; A storage battery that stores power from the solar panel; a switching unit that supplies power from the storage battery to the receiving unit and the second wireless communication network when power supply from the ground to the tower crane is stopped; The communication system for an ultra-high rise building according to claim 1 .

8. The communication system for an ultra-high rise building according to claim 7, wherein the solar panel is attached to a side wall or ceiling of the operator's seat of the tower crane.

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