JP7020044B2 - Panel lifting system and roof construction method - Google Patents

Description

The present invention relates to a panel lifting system used for installing an eaves ceiling panel and a method for constructing a roof using the panel lifting system.

Large space buildings such as outdoor stadiums and concert halls have roofs that cover the large space. For example, in Patent Document 1, spectator seats are installed so as to surround the field, and a cantilever type roof is provided above the spectator seats. These cantilever type roofs include a roof eaves frame and a roof. It is equipped with a roof plate installed on the upper surface of the eaves frame.

Japanese Unexamined Patent Publication No. 8-277643

When installing the eaves panel on such a roof, for example, after adopting a plumb bob, which is widely used as a tool for plumb bob, as a mark of the target position, install the eaves panel on the roof eaves frame. Adjust the position and installation angle, and attach the eaves panel to the roof eaves frame.

However, in the above method, the work is complicated and time-consuming, and in the case of bad weather such as a strong wind, the plumb bob sways, causing a delay in the progress of the work. On the other hand, GNSS (Global Navigation Satellite System), which is used at many construction sites as part of computerized construction, should be used because the eaves panel is installed under the large roof steel frame. Is difficult.

The present invention has been made in view of such a problem, and a main object thereof is a panel lifting system for quickly and safely constructing a roof having an eaves panel for a large space building. And to provide a way to build a roof.

In order to achieve such an object, the panel lifting system of the present invention is a panel lifting system for installing an eaves panel on the lower surface of a roof frame, and is a lifting device capable of transporting and lifting the eaves panel. And, below the planned installation position of the eaves panel on the roof frame, a positioning device that assists in positioning when installing the lifting device, and a positioning device that assists in positioning the lifting device in a direction orthogonal to the traveling direction. The positioning device is installed on one of the eaves panel and the roof skeleton, and is installed on one of the point light emitting device and the other. It is characterized by including a light receiving target that serves as an aiming portion of the point light emitted from the point light emitting device.

According to the panel lifting system of the present invention described above, the lifting device with the eaves panel mounted can be positioned below the planned installation position of the eaves panel on the roof frame by using the positioning device. This eliminates the need to correct the position of the lifting device when installing the eaves panel, which makes it possible to significantly reduce the work time and install the lifting device before eaves. It is possible to carry out the installation work of the top panel and ensure high safety in the installation work.

Further, in the panel lifting system of the present invention, the positioning assisting device is provided on the lifting device so as to project in a direction orthogonal to the traveling direction of the lifting device.
It is characterized by comprising a linear light emitting device that emits linear light toward the lower surface of the roof frame.

According to the panel lifting system of the present invention described above, when the lifting device is positioned below the planned installation position of the eaves ceiling panel on the roof frame, the lifting device is orthogonal to the traveling direction of the lifting device by using the positioning assist device. Directional positioning can be done in advance. As a result, since the positioning device needs to be used only for positioning in the traveling direction in the lifting device, the installation work of the lifting device can be performed more quickly.

The roof construction method of the present invention is a roof construction method using the panel lifting system of the present invention, and the eaves panel is mounted when the eaves panel is installed at a planned installation position of the roof frame. The lifting device in the raised state is run toward the lower side of the planned installation position of the eaves panel on the roof frame, and the point light emitted from the point light emitting device of the positioning device receives the light. It is characterized in that the lifting device is installed when the target is irradiated.

According to the roof construction method of the present invention described above, the lifting device constituting the panel lifting system is positioned and installed below the planned installation position of the eaves ceiling panel on the roof frame by using the positioning device. As a result, the eaves panel can be positioned with respect to the roof frame simply by lifting the eaves panel to a predetermined height with a lifting device, so the work time required to install the eaves panel can be reduced and the construction period can be significantly shortened. It is possible to shorten it to.

According to the present invention, the lifting device constituting the panel lifting system can be positioned below the planned installation position of the eaves panel on the roof frame by the positioning device, so that when the eaves panel is installed on the roof frame, the eaves panel can be installed. It is possible to quickly and safely construct a roof equipped with an eaves panel for a large space building without the need to correct the position of the lifting device.

It is a figure which shows the outline of the roof stadium and the work stage in embodiment of this invention. It is a figure which shows the lifting apparatus and the positioning assisting apparatus which constitute the panel lifting system 50 in embodiment of this invention. It is a figure which shows the positioning apparatus installed in the eaves panel in embodiment of this invention. It is a figure which shows the point-like light emitting device which comprises the positioning device in embodiment of this invention. It is a figure which shows the light receiving target which constitutes the positioning apparatus in embodiment of this invention. It is a figure which shows the example of the case where the point light emitting device in embodiment of this invention is attached to a roof skeleton. It is a figure which shows the example of the case where the light receiving target in the embodiment of this invention is attached to the eaves ceiling panel. It is a flow figure which shows the installation procedure of the eaves panel in embodiment of this invention. It is a figure which shows the installation state of the eaves panel in embodiment of this invention (the 1). It is a figure which shows the installation state of the eaves panel in embodiment of this invention (the 2). It is a figure which shows the installation state of the eaves panel in embodiment of this invention (the 3).

INDUSTRIAL APPLICABILITY The present invention is a panel lifting system and a panel lifting system that can be suitably used when installing an eaves ceiling panel on a roof frame located at a high place in a large space building such as an outdoor stadium or a concert hall. This is a roof construction method using a heavy system. Below, as an example of a large space building, an outdoor stadium with a roof above the spectators' seats is taken as an example, and a method of constructing a roof using a panel lifting system and a panel lifting system is shown in FIGS. 1 to 11. I will explain while doing it.

As shown in FIG. 1, the outdoor stadium 100 includes a field 1 located in the center, a stand 2 arranged so as to surround the field 1, and a roof 3 installed above the stand 2.

The roof 3 is supported by a plurality of columns 4 installed along the outer periphery of the stand 2 in the form of cantilever beams, and the roof skeleton 5 overhanging the field 1 side and the eaves heaven installed on the lower surface of the roof skeleton 5. It includes a panel 6 and a roof finishing material 7 installed on the upper surface of the roof frame 5. The installation work of the eaves ceiling panel 6 and the roof finishing material 7 is carried out on the work stage 10 arranged below the roof frame 5.

The work stage 10 includes a work floor 11 arranged between the stand 2 and the roof frame 5, inner legs 12 that support the field 1 side of the work floor 11, and outer legs 13 that support the stand 2 side of the work floor 11. And prepare. Further, an overhanging floor 14 that functions as a loading space is provided on the stand 2 side of the work floor 11, and the roof frame 5 does not exist above the overhanging floor 14.

Therefore, the construction materials, tools, etc. necessary for constructing the roof 3 grounded in the ground yard (not shown) constructed in the field 1 are lifted by a large lifting machine M such as a crane. Can be transported onto the overhanging floor 14. On such a work stage 10, installation work of the eaves ceiling panel 6 using the panel lifting system 50 is carried out.

<Panel lifting system 50>
As shown in FIG. 2, the panel lifting system 50 can freely move on the work stage 10 to convey the eaves panel 6 and lift the eaves panel 6 to the vicinity of the lower surface of the roof frame 5. As shown in FIG. 10, the device 20 and the positioning assisting device 30 that assists the positioning work in the direction orthogonal to the traveling direction of the lifting device 20 with respect to the planned installation position of the eaves panel 6 on the roof frame 5. A positioning device 40 that assists in positioning the lifting device 20 with respect to the planned installation position of the eaves panel 6 on the roof frame 5 is provided.

<Lifting device 20>
As shown in FIG. 2, the lifting device 20 supports a trolley 21 that can freely travel on the work floor 11, a panel support mechanism 23 on which the eaves panel 6 is placed, and a panel support mechanism 23. It includes a mechanism 22, a horizontal adjusting mechanism 24 installed between the panel support mechanism 23 and the elevating mechanism 22, and a terminal device 25.

The elevating mechanism 22 is installed on the bogie 21, and any device provided with an expansion / contraction mechanism capable of pushing up the panel support mechanism 23 in which the eaves panel 6 is placed to the vicinity of the lower surface of the roof frame 5. However, in the present embodiment, a pantograph jack is adopted.

The panel support mechanism 23 includes a posture control mechanism 231 including a plurality of columns having a variable length, and a level adjustment mechanism 232 installed at the top end of the posture control mechanism 231. Any structure may be adopted for the attitude control mechanism 231 and the level adjustment mechanism 232, but in the present embodiment, the attitude control mechanism 231 is provided with four telescopic columns, and the level adjustment mechanism 232 is hydraulically supplied. A jack is used.

The posture control mechanism 231 can control the mounting posture of the eaves panel 6 on the panel support mechanism 23 by appropriately adjusting the lengths of each of the four columns. Therefore, the eaves panel 6 can be mounted on the panel support mechanism 23 in the installation posture when it is installed on the roof frame 5 by using the attitude control mechanism 231, and the panel is supported by the level adjustment mechanism 232. The posture of the eaves panel 6 mounted on the mechanism 23 can be finely adjusted in the height direction.

The horizontal adjustment mechanism 24 is a mechanism for finely adjusting the horizontal position of the panel support mechanism 23 with respect to the elevating mechanism 22, and is configured by, for example, a sliding bearing such as a ball bearing or a sliding plate. As a result, the horizontal position of the eaves panel 6 mounted on the panel support mechanism 23 can be finely adjusted with respect to the elevating mechanism 22.

In this way, the lifting device 20 can be transported and lifted while being mounted on the panel support mechanism 23 in the installation posture when the eaves ceiling panel 6 is installed on the roof frame 5. Therefore, in the present embodiment, an identification number (ID) is assigned to each of the eaves panel 6, and information on each of the ID and the eaves panel 6 (for example, the shape and the installation posture when installing on the roof frame 5). Create a correspondence table associated with azimuth, push-up height, etc.). Then, the terminal device 25 for storing these correspondence tables is installed in the lifting device 20.

The terminal device 25 is a so-called notebook personal computer or tablet terminal installed on the trolley 21 of the lifting device 20, and includes a calculation processing device 251, an input unit 252, a display unit 253, a storage unit 254, and the like. The arithmetic processing device 251 is a computer having a CPU, GPU, ROM, RAM, a hardware interface, and the like. The input unit 252 is an input device such as a switch and a keyboard. The display unit 253 is a display that displays a screen.

Further, the storage unit 254 is a storage device including a semiconductor memory or a hard disk drive, and stores a program that can be executed by the arithmetic processing unit 251 and at least a correspondence table relating to the eaves ceiling panel 6. Then, when the arithmetic processing unit 251 executes the program, various functions of the arithmetic processing unit 251 are realized.

<Positioning assist device 30>
As shown in FIG. 2, the positioning assist device 30 is installed on the carriage 21 of the lifting device 20 described above, and the linear light emitting device 31 and the light emitting device frame on which the linear light emitting device 31 is mounted are mounted. 32 is provided.

The linear light emitting device 31 may be any device as long as it has a laser light emitting unit capable of emitting laser linear light L, but in the present embodiment, it is widely used for marking work. The green laser sumi appearance device is adopted.

Further, the light emitting device pedestal 32 is a plate-shaped member arranged on the side surface of the trolley 21 so as to project in a direction orthogonal to the traveling direction of the lifting device 20, and when the linear light emitting device 31 is installed, the laser is used. The area is wide enough to secure a desired distance between the linear light L and the side end surface of the eaves panel 6 mounted on the panel support mechanism 23.

In the positioning assisting device 30 having such a configuration, the linear light emitting device 31 directs the laser projecting portion vertically upward, and the laser linear light L extends in parallel with the traveling direction of the lifting device 20. It is mounted on the light emitting device stand 32. As a result, when the lifting device 20 is installed on the work floor 11, as shown in FIG. 9, the laser linear light L can be emitted from the linear light emitting device 31 with respect to the lower surface of the roof frame 5.

<Positioning device 40>
The positioning device 40 holds the panel-side holder 42 that holds the point-shaped light emitting device 41 and the point-shaped light emitting device 41 as shown in FIG. 3, and the light receiving target 43 and the light receiving target 43 as shown in FIG. The roof skeleton side holder 44 is provided.

As shown in FIG. 3, the point-like light emitting device 41 is equipped with an electron gimbal (not shown) on a laser pointer capable of emitting laser point-like light P, and is provided with an electronic gimbal (not shown) via a panel-side holder 42. It is attached to the bolt 61 of the panel 6. As shown in FIG. 4A, the panel-side holder 42 includes a frame 421 and a frame mounting portion 422.

The frame 421 is formed of a rectangular parallelepiped frame, and a point-shaped light emitting device 41 is housed inside the frame 421 so as to be swingable. As a result, the point-shaped light emitting device 41 can freely adjust the irradiation direction of the laser point-shaped light P via the electron gimbal, as shown in FIG. 4 (b). As shown in FIG. 4A, the frame mounting portion 422 may be any as long as it has a structure that allows it to be detachably mounted on the bolt 61 installed on the eaves ceiling panel 6, but this implementation is carried out. In the form, a lever lock that can be tightened and fixed to the bolt 61 is adopted.

As a result, the point-shaped light emitting device 41 held by the panel-side holder 42 is located at the tip of the bolt 61 as shown in FIG. 3, so that the laser spot-shaped light P emits light from the tip of the bolt 61. Will be done. In the present embodiment, the point-shaped light emitting device 41 is installed on all four bolts 61 provided in the eaves panel 6, but the present invention is not necessarily limited to this, and the number thereof is appropriately limited to this. And the installation position should be decided.

On the other hand, as shown in FIG. 5A, the light receiving target 43 includes a light receiving target surface 431 which is an aiming point of the laser point light P emitted from the point light emitting device 41, and is shown in FIG. As described above, it is installed on the lower surface of the roof skeleton 5 via the roof skeleton side holder 44.

Further, as shown in FIG. 5A, the roof skeleton side holder 44 may have any structure as long as it can swingably support the light receiving target 43 so that the direction of the light receiving target surface 431 can be adjusted. As shown in FIGS. 5B and 10, the light receiving target surface 431 includes a bolt hole 511 through which the bolt 61 of the eaves panel 6 of the steel frame fastener 51 also installed on the lower surface of the roof frame 5 penetrates. The orientation is adjusted so that they face each other.

In the positioning device 40 having such a configuration, when the point-shaped light emitting device 41 is attached to the bolt 61 via the panel side holder 42, the laser point-shaped light P is emitted in the vertically upward direction. The installation angle is adjusted by the gimbal. As a result, when the lifting device 20 is installed on the work floor 11, the laser spot-like light P, as shown in FIG. 10, directly under the light receiving target 43 installed on the lower surface of the roof skeleton 5 and receives the light receiving target surface 431. Can be irradiated.

The positioning device 40 does not necessarily have to be installed in the panel side holder 42 provided with the point light emitting device 41 in the eaves ceiling panel 6 and in the roof skeleton side holder 44 provided in the roof skeleton 5 with the light receiving target 43. .. For example, by reversing the two, the point light emitting device 41 is installed in the roof skeleton side holder 44 provided in the roof skeleton 5 as shown in FIG. 6A, and the light receiving target 43 is shown in FIG. 7. In addition, it may be swingably installed on the panel side holder 42 provided in the bolt 61 of the eaves ceiling panel 6.

In this case, as shown in FIG. 6B, after aligning the bolt hole 511 provided in the steel fastener 51 with the point light emitting device 41, light is emitted from the point light emitting device 41. The installation angle of the point-shaped light emitting device 41 with respect to the roof skeleton side holder 44 is adjusted via the electronic gimbal so that the laser point-shaped light P penetrates the bolt hole 511 and irradiates vertically downward.

<How to build a roof>
A method of constructing the roof 3 of the outdoor stadium 100 using the panel lifting system 50 having the above-described configuration will be described below with reference to the flow chart of FIG. 8 showing the installation procedure of the eaves ceiling panel 6. In this embodiment, a case where the point light emitting device 41 of the positioning device 40 is provided on the eaves panel 6 and the light receiving target 43 is provided on the roof frame 5 will be described as an example.

First, the roof skeleton 5 is constructed, and the work stage 10 is assembled below the roof skeleton 5. Next, the lifting device 20 is deployed at a predetermined position on the overhanging floor 14 of the work stage 10. In the present embodiment, the home position of the lifting device 20 is prepared at a predetermined position of the overhanging floor 14. The lifting device 20 is provided with a positioning assist device 30 in advance.

<Installation procedure of eaves panel 6: STEP1>
Next, the ID of the eaves panel 6 to be installed on the roof frame 5 is input to the terminal device 25 of the lifting device 20 via the input unit 252. Then, the information necessary for the installation work of the eaves panel 6 having the matching ID is taken out from the correspondence table stored in the storage unit 254 and displayed on the display unit 253 of the terminal device 25.

Of the information required for the installation work of the eaves panel 6 displayed on the display unit 253, the attitude control mechanism 231 of the panel support mechanism 23 provided in the lifting device 20 is based on the information regarding the installation attitude of the eaves panel 6. To operate. In this state, as shown in FIG. 1, the eaves panel 6 in which the point light emitting device 41 is mounted on the bolt 61 via the panel side holder 42 in the ground yard of the field 1 is mounted on the large lifting machine M. It is lifted by using and placed on the panel support mechanism 23 of the lifting device 20.

As a result, the eaves panel 6 is placed on the panel support mechanism 23 in an installation posture with respect to the roof frame 5. Along with this work, the light receiving target 43 is attached to the steel frame fastener 51 provided at the planned installation position of the eaves panel 6 on the roof skeleton 5 via the roof skeleton side holder 44, and the direction of the light receiving target surface 431 is set. Adjust and keep it facing the bolt hole 511.

After that, the laser linear light L is emitted vertically upward from the linear light emitting device 31 of the positioning assist device 30, and the laser dotted light is emitted vertically upward from the point light emitting device 41 of the positioning device 40. Make P emit light.

<Installation procedure of eaves panel: STEP2>
As shown in FIG. 9, the lifting device 20 is run while emitting the laser linear light L and the laser spot light P toward the lower surface of the roof skeleton 5, and the eaves ceiling panel 6 is planned to be installed in the roof skeleton 5. Stop running when it reaches the vicinity of the lower part of the position. Then, using the positioning assisting device 30, positioning in a direction orthogonal to the traveling direction of the lifting device 20 is performed in advance.

Specifically, on the lower surface of the roof frame 5, a portion of the eaves ceiling panel 6 mounted on the lifting device 20 becomes a joint portion by arranging an edge portion parallel to the traveling direction of the lifting device 20. , The lifting device 20 is moved so that the laser linear light L irradiates. Next, the eaves panel 6 is mounted on the lifting device 20 so that the laser linear light L is parallel to the joint core of the joint portion and the separation distance between the joint core and the laser linear light L is set. The lifting device 20 is moved so as to match the separation distance between the edge portion and the laser linear light L. At this time, if the separation distance is set to, for example, 100 mm, positioning is easy.

It should be noted that, for example, a separately prepared laser marking device may be used to draw a marking line on the joint portion used for positioning in the direction orthogonal to the traveling direction in the lifting device 20. Then, since the lifting device 20 may be moved so that the marking line and the laser linear light L match, positioning in the direction orthogonal to the traveling direction can be performed quickly.

As a result, the direction orthogonal to the traveling direction of the lifting device 20 is positioned, and the arrangement direction of the eaves ceiling panel 6 mounted on the lifting device 20 with respect to the planned installation position also matches.

In this way, the positioning assisting device 30 performs the positioning in the direction orthogonal to the traveling direction of the lifting device 20 in advance, and then the positioning device 40 is used to position the lifting device 20 in the traveling direction.

Specifically, as shown in FIG. 10, the laser spot-like light P illuminating the lower surface of the roof frame 5 irradiates the light-receiving target surface 431 of the light-receiving target 43 located in the bolt hole 511 of the steel frame fastener 51. The lifting device 20 is moved forward or backward in the traveling direction to adjust the position appropriately.

As a result, the lifting device 20 with the eaves panel 6 mounted is positioned below the planned installation position of the eaves panel 6. In this state, the air supply to the air casters provided in the lifting device 20 is stopped, and the outriggers (not shown) are projected and installed on the lifting device 20 work floor 11.

<Installation procedure of eaves panel 6: STEP3>
After that, as shown in FIG. 11, the elevating mechanism 22 of the lifting device 20 pushes up the eaves panel 6 toward the lower surface of the roof frame 5 to a predetermined height, and removes the positioning device 40. Then, when the horizontal position or the height position of the eaves panel 6 needs to be finely adjusted, the position is finely adjusted by using the horizontal adjustment mechanism 24 and the level adjustment mechanism 232 of the lifting device 20 described above.

In this way, the eaves ceiling panel 6 is positioned at the planned installation position of the roof frame 5, and both are temporarily fixed via temporary fixing means (not shown). The push-up height of the eaves panel 6 may be displayed on the display unit 253 of the terminal device 25 as one of the information necessary for the installation work of the eaves panel 6.

After the temporary fixing of the eaves ceiling panel 6 is completed, the elevating mechanism 22 of the lifting device 20 is lowered, and the lifting device 20 is returned to the home position installed on the overhanging floor 14, and the eaves to be installed later. The above operations <STEP1> to <STEP3> are repeated until the top panel 6 is installed.

Before, before, or at the same time as the work of the eaves panel 6, the roof finishing material 7 is installed on the upper surface of the roof skeleton 5, and the temporarily fixed eaves panel 6 is fixed at the planned installation position of the roof skeleton 5. .. As a result, the roof 3 of the outdoor stadium 100 is constructed.

According to the roof construction method described above, the lifting device 20 constituting the panel lifting system 50 is placed below the planned installation position of the eaves panel 6 on the roof frame 5 by using the positioning assisting device 30 and the positioning device 40. Position and install. As a result, the eaves panel 6 is positioned with respect to the roof frame 5 simply by lifting the eaves panel 6 to a predetermined height with the lifting device 20, so that the work time for installing the eaves panel 6 is reduced. It is possible to significantly shorten the construction period.

As described above, when the installation work of the eaves ceiling panel 6 is carried out, it is not necessary to correct the position of the lifting device 20, so that the working time can be further shortened and the lifting device 20 is installed. Since the installation work of the eaves ceiling panel 6 is carried out after that, it is possible to ensure high safety in the installation work.

Further, when the lifting device 20 is positioned below the planned installation position of the eaves panel 6 on the roof frame 5, the positioning assisting device 30 is used to precede the positioning in the direction orthogonal to the traveling direction of the lifting device. Can be done. As a result, the positioning device 40 only needs to be used for positioning in the traveling direction in the lifting device 20, so that the installation work of the lifting device 20 can be performed more quickly.

When positioning the lifting device 20 for installation, the positioning assisting device 30 does not necessarily have to be used, and only the positioning device 40 is used to perform positioning in the lifting device 20 in a direction orthogonal to the traveling direction and the traveling direction. You may.

In such a case, it is advisable to appropriately increase the number of combinations of the point light emitting device 41 and the light receiving target 43 to improve the positioning accuracy. For example, when the eaves panel 6 is on a quadrangle in a plan view as in the present embodiment, at least two sets of a combination of a point light emitting device 41 and a light receiving target 43 are prepared, and each of the two points in the diagonal direction is used. It is good to arrange these.

The panel lifting system 50 of the present invention and the method for constructing a roof using the panel lifting system are not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.

For example, in the present embodiment, a rectangular panel made of a single plate is exemplified as the eaves panel 6 mounted on the lifting device 20 of the panel lifting system 50, but the present invention is not necessarily limited to this. It is possible to adopt the panel lifting system 50 regardless of the structure and shape of the eaves panel 6 such as a flat plate, a curved plate, etc., which is a unit made by connecting a plurality of plate materials. be.

1 Field 2 Stand 3 Roof 4 Pillar 5 Roof frame 51 Steel fastener 6 Eaves top panel 7 Roof finishing material 10 Work stage 11 Work floor 12 Inner legs 13 Outer legs 14 Overhanging floor 20 Lifting device 21 Truck 22 Lifting mechanism 23 Panel support mechanism 231 Attitude control mechanism 232 Level adjustment mechanism 24 Horizontal adjustment mechanism 25 Terminal device 251 Arithmetic processing device 252 Input unit 253 Display unit 254 Storage unit 30 Positioning auxiliary device 31 Linear light emitting device 32 Light emitting device Stand 40 Positioning device 41 Point-shaped light emission Device 42 Panel side holder 43 Light receiving target 44 Roof frame side holder 50 Panel lifting system 100 Outdoor stadium (large space building)
M Large lifting machine

Claims (3)

It is a panel lifting system for installing the eaves panel on the underside of the roof frame.
A lifting device capable of transporting and lifting the eaves panel,
Below the planned installation position of the eaves panel on the roof frame, a positioning device that assists in positioning when installing the lifting device, and a positioning device.
A positioning assisting device that assists in positioning the lifting device in a direction orthogonal to the traveling direction, and a positioning assisting device.
Equipped with
The positioning device is installed on one of the eaves panel and the roof frame and emits point-like light, and is installed on the other side and emits light from the point-like light emitting device. A panel lifting system characterized by comprising a light receiving target that serves as an aiming unit for point-like light. In the panel lifting system according to claim 1,
The positioning assisting device is provided on the lifting device so as to project in a direction orthogonal to the traveling direction of the lifting device.
A panel lifting system comprising a linear light emitting device that emits linear light toward the lower surface of the roof frame. A method for constructing a roof using the panel lifting system according to claim 1 or 2.
When installing the eaves panel at the planned installation position of the roof frame,
The lifting device with the eaves panel mounted is run toward the lower side of the planned installation position of the eaves panel on the roof frame.
A method for constructing a roof, which comprises installing the lifting device when the point light emitted from the point light emitting device of the positioning device irradiates the light receiving target.

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