Power receiving equipment

Abstract

To provide a power reception facility in which a gas insulation switching device main body and a mobile device connector part can be housed in an indoor space at low cost without providing a dead space in the site of the facility, and connection with a mobile device can be easily established even when the gas insulation switching device main body and the mobile device connector part are housed in an indoor space.SOLUTION: A power reception facility 1 includes a gas insulation switching device main body 2 and a mobile device connector part 3. The gas insulation switching device main body 2 and the mobile device connector part 3 are separate from each other but are normally connected through a cable 20 for movement. The gas insulation switching device main body 2 and the mobile device connector part 3 are housed in a tent-type building 300, and wheels 40 are attached to the mobile device connector part 3. A rail 302 on which the wheels 40 are put is disposed in the tent-type building 300. The mobile device connector part 3 can move along the rail 302 in an area from a prescribed position in the tent-type building 300 to an entrance 301, and can move freely in an area outside the entrance 301.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a power receiving facility that is configured as a gas-insulated switchgear and that can ensure power transmission by connecting a mobile equipment connection section that is physically separated and independent from the main body of the gas-insulated switchgear to a mobile equipment that is equipped with a specified device such as a switchgear. [Background technology]

[0002] In recent years, gas-insulated switchgear (also referred to as GIS), such as that shown in Patent Document 1, has come to be used in power receiving facilities through which large-scale electricity consumers receive electricity from electric power companies. Accordingly, when renovating existing power receiving facilities, air-insulated switchgears and the like are sometimes replaced with gas-insulated switchgears (also referred to as conversion to gas-insulated switchgear or conversion to GIS). In addition, power receiving facilities converted to gas-insulated switchgears are sometimes installed outdoors.

[0003] On the other hand, in order to ensure power transmission to consumers during inspection work in which electricity is cut off to electrical equipment such as transformers and circuit breakers installed in substations, or during emergencies such as power outages caused by disasters, mobile equipment (mobile switchgear) may be connected to power receiving equipment, as shown in Patent Document 2, for example. In conventional gas-insulated switchgear, as shown in Patent Document 3, for example, a connection part for connecting to a power cable is provided integrally with the main body of the gas-insulated switchgear, and therefore, even in power receiving equipment converted into gas-insulated switchgear, the connection part provided integrally with the main body of the gas-insulated switchgear may be used as a connection part with the mobile equipment, and a power cable connected to one end of the connection part may be drawn out toward the mobile equipment and connected to the connection part of the mobile equipment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-55730 [Patent Document 2] Japanese Patent Application Publication No. 9-56022 [Patent Document 3] Japanese Patent Application Publication No. 7-231525 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if power receiving equipment is installed outdoors in a harsh environment where it is subject to the effects of corrosive gases and salt damage, even if the power receiving equipment is converted to gas insulated switchgear, corrosion degradation will progress quickly, damage from salt damage will be greater, the frequency of maintenance and part replacement will increase, and problems with the power receiving equipment may become more likely.Measures to prevent such corrosion degradation and salt damage include the use of heavy-duty anticorrosion paint and the installation of covers on specified equipment (insulating spacers, etc.), as well as the possibility of housing the power receiving equipment converted to gas insulated switchgear indoors, but building a typical concrete structure and housing the equipment indoors will increase construction costs and future maintenance costs.

[0006] Furthermore, even if the power receiving equipment is converted to a gas-insulated switchgear, if the mobile equipment is directly connected to an air connection part for mobile equipment that is provided integrally with the main body of the gas-insulated switchgear by an electric cable or the like, it is necessary to ensure the insulation distance and to consider the margin of connection between the connection part and the mobile equipment. For this reason, even when the power receiving equipment is converted to a gas-insulated switchgear and installed on the premises of a substation or the like, taking into consideration the location of the mobile equipment, there is a risk that dead space will be created on the premises of the substation or the like, depending on the installation location of the power receiving equipment converted to a gas-insulated switchgear.

[0007] Furthermore, in a configuration in which the connection part used for the mobile equipment is integrally provided on the main body of the power receiving equipment converted into a gas-insulated switchgear, the connection position and direction of the connection part with the mobile equipment are fixed, so depending on the placement of the mobile equipment, it may be difficult to connect the connection part to the mobile equipment. In other words, the placement of the mobile equipment is also restricted.

[0008] The present invention has been made to solve the above problems, and has as its main object to provide power receiving equipment that, when converted into a gas-insulated switchgear through renovation or the like, can house the main body of the gas-insulated switchgear and the mobile equipment connection section indoors at low cost and without creating dead space on the premises, and that allows easy connection to the mobile equipment even when the main body of the gas-insulated switchgear and the mobile equipment connection section are housed indoors. [Means for solving the problem]

[0009] To achieve the above object, the present invention provides a power receiving facility comprising at least a gas-insulated switchgear main body formed by sealing a power receiving device in an airtight container filled with insulating gas, and a mobile device connection section for temporarily connecting the gas-insulated switchgear main body to a mobile device used to supply electricity to the gas-insulated switchgear main body via a first cable, the gas-insulated switchgear main body and the mobile device connection section being separate from each other and permanently connected to each other via a second cable, the gas-insulated switchgear main body and the mobile device connection section being housed in a tent-type building formed by combining a frame and a sheet-like member, and the mobile device connection section being accessible through an opening on the side of the tent-type building. The power receiving device is, for example, a switching device such as a circuit breaker or a disconnecting switch, and an instrument transformer. The gas-insulated switchgear is, for example, for three-phase AC. Examples of the mobile device include a mobile transformer and a mobile switchgear, as well as a self-propelled device and a vehicle equipped with a transformer, a switchgear, etc. The second cable is a flexible power cable, such as a mobile cable. The mobile equipment connection section is configured, for example, with a bushing, more specifically, a polymer bushing, attached to the base. A tent-type building is a type of membrane structure building, such as a tent warehouse building that complies with the "Safety-Required Technical Standards for Construction Methods" (complies with the Building Standards Act) as stipulated in Article 80-2, Paragraph 2 of the Building Standards Act Enforcement Order (Cabinet Order No. 338 of 1950) and Ministry of Land, Infrastructure, Transport and Tourism Notification No. 667 of July 23, 2002 (amended by Ministry of Land, Infrastructure, Transport and Tourism Notification No. 203 of June 25, 2019). Tent-type buildings are also called tent warehouses, tent houses, etc., provided that they comply with the Building Standards Act.

[0010] In this way, the main body of the gas-insulated switchgear is housed in a tent-type building, and the mobile equipment connection unit that is permanently connected to the main body of the gas-insulated switchgear is also housed in the tent-type building except when connected to mobile equipment, which makes it possible to reduce construction costs and future maintenance costs compared to constructing and housing a general building made of concrete, etc., and to suppress damage caused by outdoor placement, such as corrosion, deterioration, and salt damage. When connecting to mobile equipment, the mobile connection unit enters and exits through an entrance provided on the side of the tent-type building, which improves the margin for connection with the mobile equipment and eliminates the need to install the tent-type building close to the location where the mobile equipment is installed, thereby increasing the flexibility in the installation location of the tent-type building and making it possible to avoid dead space being created on the site of a substation, etc., due to the installation of the tent-type building.

[0011] The power receiving equipment of the invention described in claim 2 is characterized in that wheels for mobility are attached to the bottom of the mobile equipment connection part, and rails on which the wheels of the mobile equipment connection part rest are provided within the tent-type building from a predetermined position to the entrance / exit, so that the mobile equipment connection part can move along the rails from the predetermined position to the entrance / exit, and can move freely outside the entrance / exit of the tent-type building.

[0012] As a result, the mobile device connection unit moves along the rail from the entrance to a predetermined position within the tent-type building, making it easy to position the mobile device within the tent-type building simply by moving the mobile device connection unit to the end of the rail. Also, once the mobile device leaves the entrance to the tent-type building, the mobile device connection unit can be freely moved without the need for a rail, so the orientation of the mobile device connection unit can be changed to any direction, making it easy to connect the mobile device to the mobile device connection unit no matter how the mobile device is facing. [Effects of the Invention]

[0013] As described above, according to the power-receiving equipment of the present invention, the main body of the gas-insulated switchgear is housed in a tent-type building, and the mobile equipment connection unit connected to the main body of the gas-insulated switchgear is also housed in the tent-type building except when connected to mobile equipment. This reduces costs compared to constructing a typical concrete or other building and suppresses damage caused by outdoor placement, such as corrosion and salt damage, thereby reducing the number of maintenance and part replacements. Furthermore, when connecting the mobile equipment connection unit to the mobile equipment, it is accessed through an entrance on the side of the tent-type building, so there is no need to install the tent-type building close to the location where the mobile equipment is installed. This increases the flexibility in the location of the tent-type building and prevents dead space on the site caused by the installation of the tent-type building.

[0014] In particular, according to the power receiving equipment of the invention described in claim 2, the mobile device connection unit moves along a rail from the entrance to a predetermined position within the tent-type building, so positioning within the tent-type building can be easily performed by simply moving the mobile device connection unit to the end of the rail. Also, once the mobile device leaves the entrance to the tent-type building, the mobile device connection unit can be freely moved without a rail, so the orientation of the mobile device connection unit can be changed to any direction, so the mobile device can be easily connected to the mobile device connection unit regardless of the orientation of the connection port for the mobile device with the mobile device connection unit. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a plan view showing an example of a power-receiving facility to which the present invention is applied, which schematically shows a main body of a gas-insulated switchgear housed in a tent-type building, a mobile equipment connection section that enters and exits the tent-type building, and also shows a mobile equipment arranged outside the tent-type building. [Figure 2]FIG. 1 is a side view schematically showing a main body of a gas-insulated switchgear housed in a tent-type building as an example of the power-receiving facility, a mobile equipment connection section entering and exiting the tent-type building, and mobile equipment arranged outside the tent-type building. [Figure 3] 1A is a plan view schematically showing an example of the main body of the gas-insulated switchgear, and FIG. 1B is a front view schematically showing an example of the main body of the gas-insulated switchgear. [Figure 4] 2 is a schematic diagram of a circuit configuration of a main body of the gas-insulated switchgear. FIG. [Figure 5] FIG. 2(a) is a front view schematically showing an example of the mobile device connector, and FIG. 2(b) is a side view schematically showing the example of the mobile device connector. [Figure 6] 10 is an explanatory diagram showing a schematic view of the lower part of a mobile device connection part with wheels mounted on rails near an entrance / exit inside a tent-type building. FIG. [Figure 7] FIG. 1(a) is a perspective view that schematically shows an example of a tent-type building, and FIG. 1(b) is a cross-sectional view that schematically shows an example of a tent-type building. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] 1 and 2 show an example of electrical equipment 100 in which power receiving equipment 1 to which the present invention is applied is used. The electrical equipment 100 is installed within the premises of a predetermined substation, for example. In this embodiment, in addition to the power receiving equipment 1, a control facility 101 is housed in a general reinforced concrete building, for example, which houses a switchboard for operating the power receiving equipment 1 on-site, a TC (telecontroller) for remote monitoring and control from a control center, communication equipment, power transmission line protection devices, 6 kV switchgear and protection devices, etc. (These housed devices are not shown), and a mobile equipment installation area 102 in which mobile equipment 200, described below, can be temporarily installed. The dashed-dotted line LL in FIG. 1 indicates the boundary line of the premises of the substation, etc.

[0018] In this embodiment, the power receiving equipment 1 is a three-phase AC power receiving equipment compatible with 66 kV. The power receiving equipment 1 is configured as a gas-insulated switchgear (also referred to as a GIS) by sealing power receiving equipment in an airtight container filled with insulating gas (SF6 gas). The power receiving equipment 1 includes at least a gas-insulated switchgear main body 2 and a mobile equipment connection unit 3 for connecting to mobile equipment 200, and is configured by housing the gas-insulated switchgear main body 2 and the mobile equipment connection unit 3 within a tent-type building 300. In this embodiment, to prevent corrosion, two distribution boxes that are normally installed outdoors are also housed within the tent-type building 300. In other words, the only electrical equipment installed outdoors is a distribution transformer.

[0019] The gas-insulated switchgear main body 2, the mobile equipment connection section 3, the tent-type building 300, and the mobile equipment 200 will be described below in this order.

[0020] An example of a gas-insulated switchgear body 2 to which the present invention is applied is shown in the schematic diagram of Fig. 3 and the circuit diagram of Fig. 4. This gas-insulated switchgear body 2 is configured to have six units U1 to U6, arranged in the following order from the farthest side from an entrance 301 of a tent-type building 300 (described below): a transformer unit U1, a transmission line circuit unit U2, a busbar section / auxiliary unit U3, a transmission line unit U4, a busbar section / auxiliary / emergency unit U5, and a transmission line circuit unit U6. Unlike the mobile equipment connection unit 3 (described below), each unit U1 to U6 is installed so that it cannot move freely. The parts that make up the exterior of each unit U1 to U6 in Fig. 3 are airtight containers filled with insulating gas (SF6 gas).

[0021] As shown in FIG. 4, the transformer unit U1 has at least a connection part 5, a circuit breaker 6, and a disconnecting switch 7, and the connection part 5 is connected to the connection part 4a of the transformer 4. As shown in FIG. 4, the transmission line circuit unit U2 and the transmission line circuit unit U6 are identical units having at least a connection part 8, a disconnecting switch 9, and a circuit breaker 10, but in this embodiment, they are connected to different lines (for example, the transmission line circuit unit U2 is connected to a predetermined line 1L, and the transmission line circuit unit U6 is connected to a predetermined line 2L). As shown in FIG. 4, the busbar section / auxiliary unit U3 has at least a load break switch (hereinafter referred to as LBS) 11. As shown in FIG. 4, the transmission line unit U4 has at least a connection part 12, a disconnecting switch 13, and a circuit breaker 14, and the connection part 12 is connected to a line leading to a large consumer. As shown in Fig. 4, the busbar sectioning, auxiliary and emergency unit U5 has at least a connection part 15 and a circuit breaker 16, and also has an LBS 11 on the transmission line unit U4 side of these connection part 15 and disconnecting switch 16, and the connection part 15 can be used to connect to a bushing 36 of the mobile equipment connection part 3 via a mobile cable 20, as described below. At least the disconnecting switches 7, 9, 13, 16, circuit breakers 6, 10, 14 and LBS 11 correspond to the power receiving equipment described in the claims.

[0022] In this way, by reducing the number of units in the main body 2 of the gas insulated switchgear, which is normally seven or more, to six, the main body 2 of the gas insulated switchgear is made more compact, which contributes to the miniaturization of the tent-type building 300 described below. Also, by arranging two LBSs 11, 11 as described above, it is possible to use either LBS 11, 11 whether electricity is supplied to the power receiving equipment 1 from a specified line 1L or from a specified line 2L.

[0023] As shown in Figures 1, 2, 5 and 6, the mobile equipment connection part 3 is physically separated (independent) from the main body 2 of the gas-insulated switchgear and can be moved freely, such as towards or away from the main body 2 of the gas-insulated switchgear, while being constantly connected to the connection part 15 of the auxiliary / emergency unit U5 of the main body 2 of the gas-insulated switchgear by a mobile cable 20.

[0024] As shown in the schematic diagrams of FIGS. 5 and 6, the mobile equipment connection section 3 is configured to have at least a base 31 and bushings 36, 36, 36 mounted on the base 31.

[0025] 5 and 6, in this embodiment, the mount 31 has a top plate 32 on which bushings 36, 36, 36 described below are installed, a bottom plate 33 on whose bottom side wheels 40 described below are installed, an intermediate plate 34 disposed between the top plate 32 and the bottom plate 33, and upright structures 35, 35 that are connected to and support the top plate 32, intermediate plate 34, and bottom plate 33. In order to lower the center of gravity of the mount 31, a weight (such as a water tank) W can be placed on the bottom plate 33, as shown by the imaginary line in FIG. 6. The mount 31 shown in FIGS. 5 and 6 is an example of a mount to which the present invention can be applied.

[0026] As shown in FIGS. 5 and 6 , in this embodiment, the wheels 40 are pivotally supported on mounting portions 41, which are, for example, in an inverted U shape and have two upright walls extending downward from the bottom surface of the bottom plate 33. The mounting portions 41 may be fixed to the bottom plate 33, or may be attached to the bottom plate 33 so that the mounting portions 41 can rotate around their attachment points to the bottom plate 33. The wheels 40 have radial dimensions and thickness that allow them to rotate smoothly along the longitudinal direction of the rails 302, which will be described below. To prevent the platform 31 from moving due to the rotation of the wheels 40 when it is not needed, the platform 31 has jacks 42 that raise the wheels 40, as shown in FIG. 6 , and is also fitted with fixing brackets (not shown) that secure the platform 31 in a raised state with the wheels 40 raised.

[0027] In this embodiment, for example, polymer bushings are used for the bushings 36, 36, 36 in order to reduce the weight of the mobile equipment connection portion 3. As an example of the configuration of the bushings 36, 36, 36 that use polymer bushings in this way, although not shown, the bushings 36, 36, 36 have a configuration in which epoxy resin is used as the main insulating material of the conductor and the outer surface of a columnar body made of this epoxy resin is covered with silicone rubber. As shown in Figures 1, 2, 5 and 6, the lower parts of the bushings 36, 36, 36 are connected to the mobile cable 20 routed through the tunnel portion 303 described below, and the upper parts of the bushings 36, 36, 36 are connected to the cable (power cable) 50.

[0028] The tent-type building 300 shown in Figures 1, 2, 6, and 7 is a type of membrane structure building, and is a tent warehouse building that complies with the "Safety-Required Technical Standards Regarding Structural Methods" set forth in, for example, Article 80-2, No. 2 of the Building Standards Act Enforcement Order (Cabinet Order No. 338 of 1950) and Ministry of Land, Infrastructure, Transport and Tourism Notification No. 667 of July 23, 2002 (amended by Ministry of Land, Infrastructure, Transport and Tourism Notification No. 203 of June 25, 2019).

[0029] 1, a tent base 400 for setting up the tent-type building 300 is provided above and surrounding the tent-type building 300. Furthermore, a movement area 401 is provided in an area around the tent-type building 300 adjacent to an entrance / exit 301 (described below), where the mobile device connection unit 3 is located immediately after moving from the entrance / exit 301 to the outside of the tent-type building 300, and a movable area 402 is provided at a position farther away from the entrance / exit 301 than the movement area 401, where the mobile device connection unit 3 can move to change direction, etc. It is preferable that these movement areas 401 and 402 are flat so that the mobile device connection unit 3 can move smoothly.

[0030] As shown in Figures 2 and 6, the floor area of ​​the tent-type building 300, surrounded by the tent foundation 400, has a tunnel section 303 that opens upward, except for the area where the rails 302, 302 described below are laid.As shown in Figure 6, the tunnel section 303 is blocked by placing iron plates 304 on it, except for the area below the location where the mobile equipment connection section 3 is normally located (the location where the mobile cable 20 is pulled into the tent-type building 300) and other areas that need to be open, and serves as a base for installing the main body 2 of the gas-insulated switchgear, etc.

[0031] In one example shown in FIG. 7 , the tent-type building 300 is basically composed of a frame 310 such as pillars and beams and a sheet-like member 311 attached like a curtain to the outside of the frame 310. In this embodiment, the entrance 301 can be opened and closed by a roll-up curtain 312, as shown in FIG. 7( a). However, the entrance 301 may also be opened and closed by other opening and closing means, such as a door or a shutter. Furthermore, in this embodiment, a small ventilation fan (not shown) is installed in the tent-type building 300 to reduce indoor temperature increases in summer, and a salt-removing filter box is installed at the air intake connected to the indoors to clean the outside air introduced through the intake. Furthermore, in this embodiment, due to the miniaturization of the gas-insulated switchgear main body 2 as described above, the tent-type building 300 can be downsized to a size of 100 square meters (m²) or less (e.g., 91 square meters).

[0032] 1 and 6, two rails 302, 302 are provided inside a tent-type building 300, extending from a predetermined position close to the main body 2 of the installed gas-insulated switchgear toward an entrance 301. The rails 302, 302 are laid not on top of a tunnel section 303 that is blocked with an iron plate 304, but on, for example, the concrete that forms the floor of the tent-type building 300, and are linear in this embodiment. The width between the rails 302, 302 is set so that both of the wheels 40, 40 located in the direction in which the bushings 36, 36, 36 of the mobile equipment connection unit 3 are aligned can be placed on each rail 302. Furthermore, it is preferable that the ends (terminations) of the rails 302, 302 opposite the entrance / exit 301 are set so that when the end of the rails 302, 302 reaches or near the end, the mobile equipment connection unit 3 is positioned above the position where the mobile cable 20, which has passed through the tunnel section 303 from the main body 2 of the gas-insulated switchgear, is pulled out into the tent-type building 300. This makes it possible to position the mobile equipment connection unit 3 when placing it inside the tent-type building 300 under normal circumstances simply by moving the mobile equipment connection unit 3 to the ends (terminations) of the rails 302, 302 opposite the entrance / exit 301, facilitating the positioning work.

[0033] 1 and 2, as an example of mobile equipment 200, a mobile transformer having a transformer body 203 and a bushing 204 mounted on a base 202 of a vehicle 201 is shown. However, it is sufficient for mobile equipment 200 to have bushing 204 to which one end of cable 50, one end of which is connected to the top of bushing 36 of mobile equipment connection unit 3, is connected, and mobile equipment 200 other than the mobile transformer shown in FIGS. 1 and 2 can also be used.

[0034] When using the gas-insulated switchgear main body 2, mobile equipment connection part 3, tent-type building 300, and mobile equipment 200 configured as described above, in the present invention, as shown in Figures 1 and 2, the tent-type building 300 can be installed in the mobile equipment installation area 102 while ensuring a movement area 401 and a movable area 402, thereby preventing the area on the boundary line LL side of the control facility 101 from becoming dead space, which would occur if the tent-type building 300 were installed close to the mobile equipment installation area 102.

[0035] Then, a tent-type building 300 is erected, the manufacturing cost of which is lower than that of a general concrete building such as the control facility 101, and the gas-insulated switchgear 2 and the mobile equipment connection unit 3 are normally housed in the tent-type building 300, thereby inexpensively protecting the gas-insulated switchgear 2 and the mobile equipment connection unit 3 from damage such as corrosion, deterioration, and salt damage. During work or in an emergency, first, as shown by the dashed line in Fig. 1 (the mobile cable 20 is omitted at this stage for convenience), the mobile equipment connection unit 3 is brought out from the entrance / exit 301 of the tent-type building 300 to the moving area 401, and then, as shown by the two-dot chain line in Fig. 1, the mobile equipment connection unit 3 can be moved to the moving area 402 with the mobile cable 20 still connected, and after changing the orientation of the mobile equipment connection unit 3, it can be connected to the mobile equipment 200 by the cable 50. Such movement of the mobile device connection unit 3 is made possible by using the cable 20, which is always connected, as a mobile cable, which is a flexible power cable, as described above.

[0036] Furthermore, as described above, when changing its orientation within the movable range 402, the mobile device connection part 3 can be freely changed in orientation. Therefore, even if the mobile device 200 is facing diagonally in the mobile device placement area 102 with respect to the direction of entry / exit of the mobile device connection part 3 from the entrance / exit 301 of the tent-type building 300, as shown in Figure 1, it is possible to adjust the orientation of the mobile device connection part 3 and properly connect the bushing 36 of the mobile device connection part 3 and the connection part 204 of the mobile device 200 with the cable 50. [Explanation of symbols]

[0037] 1 Power receiving equipment 2. Gas-insulated switchgear body 3 Mobile equipment connection 20 Mobile cable (second cable) 40 wheels 50 Cable (1st Cable) 200 Mobility equipment 300 Tent-style buildings 301 Entrance / Exit 302 Rail

Claims

1. The gas-insulated switchgear includes at least a main body of the gas-insulated switchgear, which is formed by sealing a power-receiving device in an airtight container filled with insulating gas, and a mobile device connection section for temporarily connecting the mobile device to the main body of the gas-insulated switchgear via a first cable, a power-receiving facility characterized in that the main body of the gas-insulated switchgear and the mobile equipment connection part are separate and constantly connected by a second cable, the main body of the gas-insulated switchgear and the mobile equipment connection part are each housed in a tent-type building formed by combining a frame and a sheet-like member, and the mobile equipment connection part can enter and exit through an entrance opening on the side of the tent-type building.

2. The power receiving equipment described in claim 1, characterized in that wheels for mobility are attached to the lower part of the mobile equipment connection part, and rails on which the wheels of the mobile equipment connection part rest are provided within the tent-type building from a predetermined position to the entrance / exit, so that the mobile equipment connection part can move along the rails from the predetermined position to the entrance / exit and can move freely outside the entrance / exit of the tent-type building.

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