JP7664608B2 - How to lift architectural panels - Google Patents

Description

The present invention relates to a method for lifting architectural panels.

As a method for lifting architectural panels such as floor panels, Patent Document 1 discloses a method in which multiple floor panels are attached and detached on a sling, and when cross members are erected on the multiple floor panels, the sling is engaged with rings provided on both ends of the cross members, and the multiple floor panels are lifted up by the sling. With this lifting method, multiple floor panels can be lifted and lowered onto beams in a side-by-side state, eliminating the need to line up the floor panels after lowering them.

However, this method of lifting floor panels using cross members had the risk of the floor panel falling during lifting because the cross members were not fixed to the floor panel. Also, when lowering the lifted floor panel so that it was adjacent to the existing floor panel on the beam, the rings of the cross members protruding to the side of the floor panel interfered with the existing floor panel, making it difficult to position the floor panel without any gaps.

A conventional method for lifting architectural panels is to use a lifting device that is fixed using a through hole formed in the panel (for example, Patent Document 2). In this case, the above-mentioned problem of the protruding part of the cross member interfering with the floor panel does not occur. However, if the floor panel is exposed to the interior of the room due to an exposed ceiling, etc., there is a risk that the through hole in the floor panel will impair the design of the room.

Japanese Patent Application Publication No. 11-241508 Japanese Patent Application Publication No. 5-116881

Therefore, the present invention aims to provide a method for lifting architectural panels that allows for easy and reliable lifting operations while maintaining the aesthetic appeal of the architectural panels.

The object of the present invention is achieved by a method for lifting an architectural panel, in which a lifting device is fixed to the upper surface of the architectural panel and then a string-like member is attached to the lifting device and the panel is lifted, the architectural panel being made of an orthogonal laminated board, the lifting device having a disk-shaped base plate and a mounting member supported by the base plate and to which the string-like member is attached, the base plate having a cross-shaped rib on its upper surface and each partition defined by the ribs having a through hole through which a screw is inserted, and the method for lifting an architectural panel fixes the lifting device to the orthogonal laminated board by screwing the screws into three or more layers from the upper surface side of the orthogonal laminated board at a length that does not penetrate the orthogonal laminated board.

In this method of lifting an architectural panel, it is preferable to place the lifting devices at the four corners of a rectangular area set on the upper surface of the architectural panel, and fix the lifting devices so that a portion of the rib runs along the diagonal of the rectangular area.

The architectural panel is preferably a floor panel whose underside becomes an exposed ceiling surface.

The present invention provides a method for lifting architectural panels that allows for easy and reliable lifting operations while maintaining the aesthetic appeal of the architectural panels.

1 is a plan view of a lifting tool used in a method for lifting a construction panel according to one embodiment of the present invention. FIG. 2 is a front view of the sling shown in FIG. 1 . FIG. 2 is a plan view showing an example of a construction panel to which the hanging tool shown in FIG. 1 is fixed. 1 is a cross-sectional view of a main portion of a building panel to which a hanging device is fixed. FIG. 4 is a front view showing a state in which the architectural panel shown in FIG. 3 is lifted up.

The following describes an embodiment of the present invention with reference to the accompanying drawings. Fig. 1 is a plan view of a hoisting device used in a method for hoisting an architectural panel according to one embodiment of the present invention. Fig. 2 is a front view of the hoisting device shown in Fig. 1. The hoisting device 1 shown in Figs. 1 and 2 is made of a metal such as stainless steel, and includes a disk-shaped base plate 2 and a mounting member 3 supported by the base plate 2.

A cross-shaped rib 10 with a pair of straight sections 11, 12 intersecting at right angles is fixed to the top surface of the substrate 2 by welding or the like. A cylindrical support section 7 having a screw hole in the center is provided in the center of the rib 10 where the straight sections 11, 12 intersect. The substrate 2 is divided into four sections by the ribs 10, each of which has a through hole 2a through which a screw (not shown) is inserted. The through holes 2a are formed by countersinking so that the head of the screw can be held flush with the top surface of the substrate 2.

The mounting member 3 has a block-shaped main body 4 and an engagement portion 5 that protrudes upward from the top surface of the main body 4 in an inverted U-shape. An insertion hole through which a bolt 6 is inserted is formed in the center of the main body 4, and the tip of the inserted bolt 6 is screwed into a threaded hole in the support portion 7, so that the mounting member 3 is supported so as to be rotatable around the axis of the bolt 6.

In the method for lifting an architectural panel in this embodiment, first, the lifting device 1 having the above-mentioned configuration is fixed to the upper surface of the architectural panel. The architectural panel used is a cross-laminated timber (CLT) panel made by stacking three or more layers of multiple laminas (sawn boards) so that the fiber directions are perpendicular to the top and bottom, and an appropriate number of lifting devices 1 are used according to the shape, size, etc. of the architectural panel.

For example, when hoisting an architectural panel 100 made of rectangular flat orthogonal laminated boards as shown in FIG. 3, four hoists 1 are placed at the four corners of a rectangular area A, which is a virtual area set on the upper surface of the architectural panel 100 by load calculation for the slinging work. At this time, the orientation of each hoist 1 is aligned so that a part of a pair of straight sections 11, 12 that make up the rib 10 (straight section 11 in FIG. 3) is aligned along the diagonal lines D1, D2 of the rectangular area A.

After this, screws are inserted into each of the four through holes in the sling 1, and screwed into the architectural panel 100 with an impact driver or the like, thereby fixing each sling 1 to the architectural panel 100. There are no particular restrictions on the screws used, but screws for wood are preferred, and for example, the M8 series (diameter 8 mm) of "Panellead (registered trademark) S" manufactured by Synegic Co., Ltd. can be suitably used.

The length of the screw is set so that it does not penetrate the architectural panel 100 and is screwed into three or more layers of the multiple laminas that make up the architectural panel 100. For example, as shown in the cross-sectional view of FIG. 4, in the case where the architectural panel 100 is an orthogonal laminated board composed of five lamina layers 101-105 with a thickness of 30 mm, the length of the screw 20 is set to 110 mm, so that the screw 20 is screwed into the four lamina layers 101-104 from the top side of the architectural panel 100. The length of the screw 20 may be set to, for example, 80 mm, so that the screw 20 is screwed into the three lamina layers 101-103, or the tip of the screw 20 may reach halfway through the lowest lamina layer 105 and the screw 20 may be screwed into the five lamina layers 101-105.

The fiber direction of each lamina layer 101-105 is perpendicular to that of the adjacent upper and lower layers, so that the threads of the screw 20 engage with three or more lamina layers and intertwine with the wood fibers in various directions, firmly fixing the screw 20 to the architectural panel 100. Even if the screw 20 passes through a knothole formed in one of the lamina layers, the engagement with the remaining multiple lamina layers prevents a decrease in the mounting strength of the screw 20. Therefore, the hanging device 1 can be easily and reliably fixed to the architectural panel 100.

After the four hoisting devices 1 are fixed to the top surface of the architectural panel 100, the end fittings of the string-like members 30, such as slings or wires, are attached to each hoisting device 1 as shown in FIG. 5, and the hoisting device 1 is lifted up by a crane or the like in the conventional manner. The hoisting angle α of the string-like members 30 shown in FIG. 5 is not necessarily limited, but it is preferable to set it to about 60 degrees, for example.

The method for lifting architectural panels of the present invention can be suitably used to lift floor panels to the second or higher floor, and when the lifted floor panel is lowered onto the beams, it can be placed adjacent to the existing floor panel without leaving any gaps, which expedites construction work. In addition, since the screw holes are not exposed on the underside of the floor panel after the lifting device is removed from the floor panel, the design can be well maintained even if, for example, the underside of the floor panel is used as the exposed ceiling surface of the floor below.

Reference Signs List 1 Hanging tool 2 Substrate 2a Through hole 3 Mounting member 10 Rib 20 Screw 30 String-like member 100 Building panel

Claims (3)

A method for lifting an architectural panel, comprising the steps of: fixing a hoisting tool to an upper surface of the architectural panel; attaching a string-like member to the hoisting tool; and lifting the architectural panel.
The building panel is made of cross-laminated boards,
The suspender includes a disk-shaped base plate and an attachment member supported by the base plate and to which the string-shaped member is attached,
The substrate has a cross-shaped rib on an upper surface side, and each partition defined by the rib has a through hole through which a screw is inserted,
A method for lifting an architectural panel, in which the lifting device is fixed to the orthogonal laminated board by screwing the screws into three or more layers from the top side of the orthogonal laminated board at a length that does not penetrate the orthogonal laminated board. A method for lifting an architectural panel as described in claim 1 , wherein the lifting devices are respectively placed at the four corners of a rectangular area set on the upper surface of the architectural panel, and the lifting devices are fixed so that a portion of the rib is along the diagonal of the rectangular area. 3. The method for hoisting an architectural panel according to claim 1, wherein the architectural panel is a floor panel having an exposed ceiling surface on the underside.

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