Construction method of building ceiling

Abstract

To provide a construction method of a building ceiling by which anyone can easily construct the building ceiling without increasing construction costs.SOLUTION: The construction method of the building ceiling includes: step A of temporarily fixing a first ceiling surface material 40A to a pair of joists 10 by temporarily fixing a first piece 52 of a pair of first jigs 50 to flanges 12 of the pair of joists 10 and sandwiching a first end 45 between a second piece 53 of the first jig 50 and a web 11 of the joist 10; step B of overlapping a second ceiling surface material 40B and a second end 48 of the first ceiling surface material 40A to form a first overlapping area and temporarily fixing the second ceiling surface material 40B to the pair of joists 10 via the pair of first jigs 50; step C of disposing a second jig 60 having fastener alignment holes 65 with larger plan dimensions than a fastener 70 at positions corresponding to the plurality of joists 10 at the first overlapping area, temporarily fixing it to the joist 10, and fixing the first overlapping area to the joist 10 with the fastener 70; and step D of removing the second jig 60 and the first jig 50.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a method for installing a building ceiling. [Background technology]

[0002] When constructing building ceilings, ceiling surface materials are attached to ceiling underlayment such as rafters by using special tools (screws, bolts, etc.) while working upwards. This installation of ceiling surface materials requires experience and skill, and is not a job that anyone can do. In these days when there is a labor shortage and labor-saving technology is desperately needed, the development of technology that allows anyone to easily construct building ceilings has become an issue.

[0003] On the other hand, ceiling surface materials such as gypsum boards are generally installed by butting, but this method has the problem that if gaps occur between adjacent ceiling surface materials, the gaps become noticeable. To eliminate the occurrence of gaps, measures such as inserting joint materials between the ceiling surface materials are taken, but as mentioned above, the installation of joint materials also requires experience and technology, which creates new problems such as longer construction periods and increased material costs.

[0004] Therefore, Patent Document 1 proposes a building ceiling and an installation method thereof that can be easily installed by anyone and does not cause gaps between adjacent ceiling panels. This building ceiling installation method is an installation method in which a ceiling panel is attached to a ceiling base material via a locking piece that is slidably locked to the ceiling base material. Only a male snap button constituting a fastener is attached to the locking piece, and the fastener is composed of a male snap button having a first male part and a female snap button having a first female part with which the first male part fits, and the ceiling panel includes a first ceiling panel and a second ceiling panel, and a plurality of pairs of button holes are opened in the edge parts of each ceiling panel at positions that correspond when the panels are overlapped with each other, and the edges of the first ceiling panel and the second ceiling panel are overlapped with each other, and the first male parts are inserted into the respective pairs of button holes, and the first female part is fitted into the first male part. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-42609 Summary of the Invention [Problem to be solved by the invention]

[0006] According to the method of constructing a building ceiling described in Patent Document 1, the building ceiling is constructed using snap buttons, so that anyone can easily perform the construction without creating gaps between the ceiling surface materials.

[0007] However, when using snap buttons, special hardware is required to secure the snap buttons. As a result, as the number of snap buttons increases, the number of special hardware required for fastening also increases, raising concerns about increased construction costs.

[0008] The present invention has been made in consideration of the above problems, and aims to provide a method for constructing a building ceiling that allows anyone to easily construct a building ceiling without increasing construction costs. [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the building ceiling installation method according to the present invention is to A method for constructing a building ceiling by attaching a plurality of ceiling surface materials having a rectangular shape in plan view, the ceiling surface materials having a width spanning the plurality of furring strips, the furring strips having a pair of flanges and webs and extending in a first direction, and a pair of first ends parallel to the first direction and a pair of second ends parallel to the second direction, to a ceiling substrate having the webs facing downward and spaced apart in a second direction, A process includes temporarily fixing the first pieces of a pair of first jigs having an L-shaped cross section to the flanges of a pair of rafters, and sandwiching the pair of first end portions of a first ceiling surface material between the second pieces of the pair of first jigs and the webs of the pair of rafters, thereby temporarily fixing the first ceiling surface material to the pair of rafters; A process B includes overlapping one of the second ends of the second ceiling surface material with one of the second ends of the first ceiling surface material to form a first overlapping portion, and temporarily fixing the second ceiling surface material to the pair of joists via the pair of first jigs in a manner similar to that of the first ceiling surface material; A second jig having fastener alignment holes with a planar dimension larger than that of the fastener at positions corresponding to the plurality of furring strips is disposed at the first overlapping portion to temporarily fix the second jig to the furring strip, and the first overlapping portion is permanently fixed to the furring strip by a fastener through at least one of the fastener alignment holes; and The method further comprises a step D of removing the second jig and the first jig.

[0010] According to this aspect, a pair of first end portions of a first ceiling surface material are temporarily fixed to a pair of joists via a pair of first jigs, and while the second end portion of the first ceiling surface material and the second end portion of the second ceiling surface material are overlapped to form a first overlapping area, the second ceiling surface material is temporarily fixed to the pair of joists via the pair of first jigs in the same manner as the first ceiling surface material, and a second jig having a fastener alignment hole with a larger planar dimension than the fastener is arranged at the first overlapping area to temporarily fix it to the joists, and the first overlapping area is finally fixed to the joists with the fastener via the fastener alignment hole.By not using snap buttons, anyone can easily construct a building ceiling without increasing construction costs.

[0011] Here, the ceiling underlayment includes, in addition to the rafters, rafter supports that fix multiple rafters, and hanging bolts that suspend the rafter supports, etc. Also, the first direction, which is the longitudinal direction in which the rafters extend, and the second direction, which is the direction in which the multiple rafters are arranged at a predetermined interval, are, for example, directions that are perpendicular to each other.

[0012] The method of temporarily fixing the first piece of the first jig to the flange of the joist can be engagement or magnetic adhesion using a magnet, and it is preferable to apply a method that makes both temporary fixing and removal easy. Similarly, the method of temporarily fixing the second jig to the joist can be engagement or magnetic adhesion using a magnet, as with the first jig.

[0013] In addition, since the second jig has fastener alignment holes with larger plan dimensions than the fasteners at positions corresponding to multiple sills, after the first overlapping point is finally fixed to the sill by the fasteners through the fastener alignment holes, interference between the fasteners and the second jig can be prevented when removing the second jig, making it possible to quickly remove the second jig.

[0014] "The ceiling surface material has a width that spans multiple rafters" includes, for example, when there are a total of five rafters, the ceiling surface material has a width that spans the entire area of ​​the rafters on the left and right ends (i.e. all five rafters), as well as a width that spans two to four rafters.

[0015] Furthermore, in the method of lining up a first ceiling surface material and a second ceiling surface material along a first direction, overlapping the second ends of both materials, and finally fixing the first overlapping point to the joist, in addition to the form in which the second ends of two first ceiling surface materials and the second ceiling surface material are overlapped, this embodiment also includes a form in which the second end of the second ceiling surface material is overlapped over the second end of the first ceiling surface material to finally fix the first overlapping point to the joist, and then the second ceiling surface material is treated as a new first ceiling surface material and the second end of a separate second ceiling surface material is overlapped over the second end of the new first ceiling surface material to finally fix the first overlapping point to the joist (thus, a form in which three ceiling surface materials are continuous via two first overlapping points), and a form in which this is repeated to make four or more ceiling surface materials continuous.

[0016] Another aspect of the building ceiling installation method according to the present invention is as follows: By carrying out the steps A to D, a group of leading ceiling surface materials extending in the first direction is constructed, The first end portions of the preceding ceiling surface material group are overlapped to form a second overlapping portion on the side of the preceding ceiling surface material group, and the steps A to D are carried out to construct a following ceiling surface material group extending in the first direction; In the construction of the subsequent ceiling panel group, in step C, the second jig is disposed at the second overlap location in addition to the first overlap location to temporarily fix the overlap location to the siding, and the first overlap location and the second overlap location are finally fixed to the siding with fasteners through the fastener alignment holes.

[0017] According to this aspect, a group of leading ceiling surface materials extending in a first direction is constructed, and a group of trailing ceiling surface materials extending in the first direction is constructed to the side of the leading ceiling surface material group while overlapping the corresponding first ends of both materials to form a second overlapping area, and when constructing the trailing ceiling surface material group, a second jig is disposed at the second overlapping area in addition to the first overlapping area to temporarily fix the overlapping area to the rough joist, and the first overlapping area and the second overlapping area are finally fixed to the rough joist with fasteners, thereby making it possible to construct a building ceiling in which multiple ceiling surface materials are lined up in both the first and second directions. Here, with regard to the method of constructing a trailing ceiling surface material group following a leading ceiling surface material group, in addition to constructing one trailing ceiling surface material group for one leading ceiling surface material group while forming a second overlap point, this embodiment also includes constructing a separate trailing ceiling surface material group while forming a second overlap point by regarding the trailing ceiling surface material group as a new leading ceiling surface material group (thus, a form in which three ceiling surface material groups are connected via two second overlap points), and repeating this to connect four or more ceiling surface material groups.

[0018] In another aspect of the method for installing a building ceiling according to the present invention, The first piece of the first jig is characterized in that a magnet is attached to it, which is magnetically attracted to the flange of the siding.

[0019] According to the present embodiment, a magnet that is magnetically attracted to the flange of the furring strip is attached to the first piece of the first jig, so that in addition to being able to firmly temporarily fix the first jig to the furring strip, the first jig can be smoothly temporarily fixed to and removed from the furring strip.

[0020] In another aspect of the method for installing a building ceiling according to the present invention, The second jig has a third piece and a fourth piece having an L-shaped cross section, the third piece abutting against the first overlapping portion and the second overlapping portion, and the fourth piece being a handle; The fourth piece of the second jig is characterized in that a magnet is attached to it which is magnetically attracted to the web of the siding.

[0021] According to this embodiment, the second jig has an L-shaped cross section and includes a third piece and a fourth piece, and the fourth piece is equipped with a magnet that is magnetically attracted to the web of the siding, so that the second jig can be firmly and temporarily fixed to the siding, and the second jig can be smoothly temporarily fixed to and removed from the siding. Also, because the fourth piece is a handle, the second jig can be temporarily fixed or removed by grasping the fourth piece, and the second jig is easy to handle.

[0022] In another aspect of the method for installing a building ceiling according to the present invention, The first jig has a length of the first end, The second jig has a length equal to the sum of the length of the second end and the length of an intersection between the second end and the first end.

[0023] According to this aspect, the first jig has the length of the first end, and the second jig has a length equal to the length of the second end plus the length of the intersection of the second end and the first end. Therefore, when the two second jigs are attached to the first and second overlapping points where they intersect, the fastener alignment holes on both ends can be aligned at the intersection of the first and second overlapping points, and the intersection can be finally fixed with fasteners via both fastener alignment holes, and the two second jigs can be removed.

[0024] In another aspect of the method for installing a building ceiling according to the present invention, The ceiling surface material is A panel having a center and the first end and the second end on a periphery of the center of the panel, The center of the panel has a three-dimensional shape that is convex toward the interior side, The first end portion and the second end portion have a plate shape extending laterally from an end side of the center of the panel, It is characterized by being a pulp molded product.

[0025] According to this embodiment, since the ceiling surface material is a pulp molded product (pulp molded product), it is possible to construct a building ceiling having a ceiling surface material that is lightweight and thin, has a variety of three-dimensional shapes, and has sufficient fire resistance, good processability (formability), and sufficient strength (rigidity).

[0026] In addition, since the center of the ceiling surface material has a three-dimensional shape that convex toward the inside of the room, and the first and second ends of the peripheral edge of the center of the surface material have a plate-like shape that protrudes laterally, the overlapping properties are improved when the second ends of the first ceiling surface material and the second ceiling surface material are overlapped to form the first overlapping area, and the overlapping properties are improved when the first ends of the preceding ceiling surface material group and the following ceiling surface material group are overlapped to form the second overlapping area, and the first jig and the second jig can be attached easily to the first overlapping area and the second overlapping area.

[0027] Furthermore, unlike ceiling surface materials such as gypsum boards, since it is not installed by butting, there is no problem of noticeable gaps occurring between adjacent ceiling surface materials. Effect of the Invention

[0028] As can be understood from the above description, according to the building ceiling installation method of the present invention, anyone can easily install a building ceiling without increasing installation costs. [Brief description of the drawings]

[0029] [Figure 1]1 is a perspective view of a ceiling underlayment applied in an example of a building ceiling construction method according to an embodiment, viewed diagonally from below. FIG. [Diagram 2] FIG. 2 is a perspective view of an example of a ceiling surface material applied in an example of a construction method for a building ceiling according to an embodiment. [Diagram 3] This is a process diagram explaining process A when constructing a group of preceding ceiling surface materials, in an example of a construction method for a building ceiling according to an embodiment. [Figure 4] FIG. 2 is a perspective view of an example of a first jig. [Diagram 5] This is an enlarged oblique view showing the state in which a ceiling surface material has been temporarily fixed to a pair of rafters via a pair of first jigs in step A. [Figure 6] Following Figure 3, this is a process diagram explaining process B when constructing the advance ceiling surface material group. [Figure 7] FIG. 13 is a perspective view of an example of a second jig. [Figure 8] 13 is a diagram illustrating the relationship between a fastener positioning hole of a second jig and the planar dimensions of the fastener. FIG. [Figure 9] Following Figure 6, this is a process diagram explaining steps B and C when constructing the preliminary ceiling surface material group. [Figure 10] This is an enlarged oblique view showing the state in which multiple ceiling surface materials have been finally fixed to the rafters by fasteners that have been driven through the fastener alignment holes of the second jig in step C. [Figure 11] This is a diagram explaining the state in which a trailing ceiling panel group is being constructed following a leading ceiling panel group that has been permanently fixed to the rough girders. [Figure 12] This is an oblique view from below of an example of a building ceiling in which three rows of ceiling surface materials are installed side by side on a ceiling base. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, an example of a method for constructing a building ceiling according to an embodiment will be described with reference to the accompanying drawings. In this specification and the drawings, substantially identical components are designated by the same reference numerals, and duplicated descriptions may be omitted.

[0031] [Construction method of building ceiling according to the embodiment] An example of a method for constructing a building ceiling according to an embodiment will be described with reference to Figs. 1 to 12. Here, Fig. 1 is a perspective view of a ceiling substrate applied in an example of a method for constructing a building ceiling according to an embodiment, seen from diagonally below, and Fig. 2 is a perspective view of an example of a ceiling surface material applied in an example of a method for constructing a building ceiling according to an embodiment. Also, Fig. 3 is a process diagram for explaining step A when constructing a group of preceding ceiling surface materials, with respect to an example of a method for constructing a building ceiling according to an embodiment, Fig. 4 is a perspective view of an example of a first jig, and Fig. 5 is an enlarged perspective view showing a state in which a ceiling surface material is temporarily fixed to a pair of rafters via a pair of first jigs by step A. Also, Fig. 6 is a process diagram for explaining step B when constructing a group of preceding ceiling surface materials following Fig. 3, Fig. 7 is a perspective view of an example of a second jig, and Fig. 8 is a view for explaining the relationship between a fastener positioning hole of the second jig and the planar dimensions of the fastener. Fig. 9 is a process diagram explaining steps B and C when constructing a group of preceding ceiling surface materials following Fig. 6, Fig. 10 is an enlarged perspective view showing a state in which a plurality of ceiling surface materials are fixed to the rafters by fasteners driven through the fastener alignment holes of the second jig in step C, and Fig. 11 is a diagram explaining a state in which a group of succeeding ceiling surface materials is constructed following the group of preceding ceiling surface materials that are fixed to the rafters. Furthermore, Fig. 12 is a perspective view from below of an example of a building ceiling in which three rows of ceiling surface materials are constructed side by side on a ceiling substrate.

[0032] In addition, the illustrated example is an example in which the building ceiling is constructed using three rows of ceiling surface materials consisting of ceiling surface materials with a width spanning three rafters, but the width of the ceiling surface materials may be a width spanning two rafters or a width spanning four or more rafters, and the building ceiling may be formed by a single row of ceiling surface material groups, or a width spanning two or four or more ceiling surface material groups.

[0033] As shown in Fig. 1, a plurality of rafters 10 extending in a first direction are arranged at intervals in a second direction perpendicular to the first direction, and a plurality of rafter supports 21 extending in the second direction are fixed to the plurality of rafters 10 with screws, clips, etc., and the plurality of rafter supports 21 are supported by hangers 22 screwed to the ends of a plurality of hanging bolts 23. A ceiling base 30 is formed by hanging the plurality of hanging bolts 23 from a ceiling beam, deck plate, concrete slab, etc. (not shown).

[0034] The siding 10 has a web 11 and a pair of flanges 12 (flanges with lips), and is supported by a siding support 21 with the web 11 facing downward (towards the interior of the room).

[0035] As shown in Figure 2, the ceiling panel 40 to be attached to the ceiling substructure 30 has a panel center 41 that is approximately box-shaped and square in plan view (an example of a rectangle), and panel peripheral edges 45, 48 that are rectangular frame-shaped and located on the periphery of the panel center 41, and the panel peripheral edges are formed by a pair of first end parts 45 and a pair of second end parts 48 that are plate-like and protrude laterally from the edge of the panel center 41.

[0036] The roughly box-shaped central panel 41 rises from rectangular frame-shaped panel edges 45, 48, and the wide surface of central panel 41 has a flat or curved surface that convex toward the interior side of the room when the central panel forms the ceiling of a building.

[0037] The ceiling surface material 40 is a pulp molded product formed by pulp molding processing.

[0038] Since the ceiling surface material 40 is a pulp molded product, it is much lighter than ceiling surface materials such as plasterboard and has excellent workability, and thin ceiling surface materials can be applied to a variety of three-dimensional shapes.

[0039] Furthermore, in the ceiling surface material 40 made of a pulp molded product, the three-dimensional shape of the center 41 of the surface material provides good design.

[0040] Furthermore, the ceiling surface material 40 made of a pulp molded product can exhibit non-combustibility or flame retardancy, and can easily achieve a desired strength.

[0041] For example, in a configuration in which the face material center 41 of the ceiling face material 40 has a curved surface that is convex toward the interior side of the room, it is preferable because, despite being a lightweight and thin pulp molded product, it is possible to suppress the occurrence of undulations that may occur in the face material center 41. As a result, when the face material peripheral edges 45, 48 of multiple ceiling face materials 40 are overlapped to form a building ceiling, no undulations occur in the ceiling face materials 40 that make up the building ceiling, and a building ceiling with excellent design properties can be formed.

[0042] Here, by using the ceiling surface material 40 made of a pulp molded product, the ceiling surface material 40 alone has a resistance of 0.5 kg / m 2 The following can be achieved, and the weight of the building ceiling, including the ceiling underlayment, is 2kg / m 2 The following can be achieved. In this way, the weight of the building ceiling including the ceiling underlayment is 2kg / m 2 By achieving the following, it is possible to form a building ceiling that is highly safe from falling and does not require measures to prevent falling off, which is preferable.

[0043] In the illustrated example, the ceiling surface material 40 is attached to the joist 10 of the ceiling foundation 30 so that the first end 45 of the surface material periphery is parallel to the first direction, and the length of both the first end 45 and the second end 48 is t1, the length of the intersection between the two is t2, and the total length of the second end 48 and the intersection, which is the sum of the lengths t1 and t2, is t3. As described below, the length of the first jig 50 (see FIG. 4) that temporarily fixes the first end 45 to the joist 10 is t1, and the length of the second jig 60 (see FIG. 7) that temporarily fixes the second end 48 to the joist 10 is set to t3.

[0044] As shown in Figure 3, a pair of first end portions 45 of a first ceiling surface material 40A (an example of a ceiling surface material) spanning a pair of sidings 10A on the left and right sides of a single siding 10B are abutted against the webs 11 of the corresponding sidings 10A, and the first end portions 45 are temporarily fixed to the sidings 10A by a first jig 50.

[0045] As shown in Fig. 4, the first jig 50 has a jig body 51 consisting of a first piece 52 and a second piece 53 each having an L-shaped cross section, and a magnet 55 having an L-shaped cross section, the magnet 55A being attached over a wide area on the inside of the first piece 52, and the magnet 55B being attached over a small area on the inside of the second piece 53. The magnet 55B attached over a small area on the inside of the second piece 53 is attached to form a gap between the second piece 53 and the web 11 of the joist 10 in which the first end 45 of the ceiling surface material 40 is sandwiched. Here, the jig body 51 is a shaped steel material such as an angle iron, or a resin or aluminum member.

[0046] The length t1 of the jig body 51 is set to the length t1 of the first end 45 of the ceiling surface material 40.

[0047] As shown in Figure 5, which is an enlarged view of the mounting area of ​​the first ceiling surface material 40A in Figure 3, the first pieces 52 of a pair of first jigs 50 are temporarily fixed to the flanges 12 of the pair of joists 10 by magnetic attraction with magnets 55A, and the pair of first end portions 45 of the first ceiling surface material 40A are respectively clamped in the gaps between the second pieces 53 of the pair of first jigs 50 and the webs 11 of the pair of joists 10 (gaps corresponding to the thickness of the magnets 55B), thereby temporarily fixing the first ceiling surface material 40A to the pair of joists 10A (this is process A).

[0048] Next, as shown in Figure 6, one of the second end portions 48 of the second ceiling surface material 40B is overlapped with one of the second end portions 48 of the first ceiling surface material 40A to form a first overlapping area, while the second ceiling surface material 40B is temporarily fixed to a pair of joists 10A via a pair of first jigs 50 in a manner similar to that of the first ceiling surface material 40A (this is process B).

[0049] Furthermore, a second jig 60 is disposed at the first overlapping portion, and the second jig 60 is temporarily fixed to the three joists 10A and 10B. Note that in FIG. 6, the first overlapping portion is hidden by the second jig 60 and is not shown.

[0050] 7, the second jig 60 has a jig body 61 consisting of a third piece 62 and a fourth piece 63, each having an L-shaped cross section, and a magnet 68 attached to the underside of the fourth piece 63. The jig body 61 is a shaped steel material such as an angle iron, or a resin or aluminum member.

[0051] In the fourth piece 63, fastener alignment holes 65 are provided at positions corresponding to the left and right sills 10A and the central sill 10B when the second jig 60 is disposed as shown in Fig. 6. Then, magnets 68, for example, having holes 69 of the same diameter as the fastener alignment holes 65, are attached at positions corresponding to the fastener alignment holes 65 in the fourth piece 63. The fastener alignment holes 65 are, as the name suggests, holes for aligning the fastener 70 (see Fig. 8) when the first overlapping portion is finally fixed to the web 11 of the sill 10 by the fastener 70.

[0052] The length of the jig body 61 is set to a total length t3 obtained by adding the length t1 of the second end 48 and the length t2 of the intersection.

[0053] 8, the hole diameter φ1 of the fastener alignment hole 65 (and the hole diameter φ1 of the hole 69 of the magnet 68) is set to be larger than the diameter φ2 of the head 72 of the screw 70, which is an example of a fastener. Therefore, the screw 70 permanently fixes the first overlapping portion to the web 11 of the joist 10 through the fastener alignment hole 65, and the screw 70 does not hinder the removal of the second jig 60 when the second jig 60 is released from the temporary fixation and removed.

[0054] As shown in Fig. 9, a separate second ceiling surface material 40B is temporarily fixed to a pair of joists 10A via a pair of first jigs 50 so that the second ends 48 of the two are overlapped to form a first overlapping portion, and a separate second jig 60 is disposed at the first overlapping portion and temporarily fixed to the joists 10. That is, in this process, the second ceiling surface material 40B (the second ceiling surface material 40B located in the center in Fig. 9) that has been temporarily fixed to the joists 10 in advance is treated as a new first ceiling surface material, and the separate second ceiling surface material 40B is temporarily fixed to the pair of joists 10A in a similar manner.

[0055] Then, by driving fasteners 70 in the X1 direction through fastener alignment holes 65 in the center of each of the two second jigs 60, each first overlap point is finally fixed to the web 11 of the joist 10B, and a preliminary ceiling surface material group 80A formed by three ceiling surface materials 40 is constructed.

[0056] Fig. 10 is an enlarged view of the preceding ceiling surface material group 80A. As is clear from Fig. 10, the first jig 50 having a relatively short length t1 and the second jig 60 having a relatively long length t3 extending to the intersection do not interfere with each other.

[0057] Here, in the illustrated example, since the following ceiling surface material group 80B is constructed to the side of the preceding ceiling surface material group 80A, at the stage where the preceding ceiling surface material group 80A is constructed, the first overlapping portion is not fixed to the pair of joists 10A by the fastener 70 through the fastener alignment holes 65 at the left and right ends of the second jig 60. However, if the construction of the following ceiling surface material group 80B is unnecessary and the building ceiling is formed only with the preceding ceiling surface material group 80A, the first overlapping portion is fixed to the web 11 of the corresponding joist 10 through all the fastener alignment holes 65 of the second jig 60. After that, the building ceiling is constructed by releasing and removing the temporary fixation of the first jig 50 and the second jig 60 (step D).

[0058] As shown in Fig. 11, following the construction of the preceding ceiling surface material group 80A, the following ceiling surface material group 80B is constructed to the side thereof. In constructing the following ceiling surface material group 80B, the corresponding first ends 45 of both ceiling surface materials 40 are overlapped to form a second overlapping portion to the side of the preceding ceiling surface material group 80A, while carrying out the already-described steps A to D, thereby constructing the following ceiling surface material group 80B extending in the first direction.

[0059] In the construction of the subsequent ceiling panel group 80B, in step C, a second jig 60 is placed at the second overlap location in addition to the first overlap location to temporarily fix the same to the joist 10, and fasteners 70 are driven into the web 11 of the joist 10 in the X2 direction through each fastener alignment hole 65 to permanently fix the first overlap location and the second overlap location to the joist 10.

[0060] In Fig. 11, reference numeral 70A indicates a final fixing portion where the overlapping portion is finally fixed to the joist 10 by the fastener 70. In particular, the fastener alignment holes 65 at the end of the second jig 60 are aligned with the intersections of the four ceiling surface materials 40, and the fasteners 70 finally fix the intersections via the fastener alignment holes 65 of the aligned second jigs 60.

[0061] As shown in Figure 12, a separate group of trailing ceiling surface materials 80C is constructed in a similar manner to the side of the central group of trailing ceiling surface materials 80A, and each of the first and second overlapping points is finally fixed to the joist 10 by the final fixing portion 70A. By removing the first jig 50 and the second jig 60 from each overlapping point, a building ceiling 100 is constructed, formed by the groups of ceiling surface materials 80B, 80A, and 80C in which three ceiling surface materials 40 are lined up in a first direction.

[0062] The illustrated building ceiling 100 may be applied to either a temporary building or a permanent building. Temporary buildings include temporary arenas for outdoor events, temporary housing that requires immediate construction after an earthquake disaster, temporary accommodation facilities, etc. Permanent buildings include large stores such as commercial facilities and leisure facilities, factories, office buildings (system ceilings), medical and welfare facilities, government buildings, hotels and accommodation facilities, educational facilities, etc.

[0063] According to the illustrated example of the building ceiling construction method, anyone can easily construct the building ceiling without increasing construction costs. In addition, by applying the ceiling surface material 40, which is a pulp molded product, the problem of noticeable gaps between ceiling surface materials caused by butt joint construction is eliminated, and the building ceiling 100 with excellent design can be constructed with good workability.

[0064] In addition, the configurations and the like listed in the above embodiment may be combined with other components to form other embodiments, and the present invention is not limited to the configurations shown here. In this regard, changes can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form. [Explanation of symbols]

[0065] 10: Rough lining (ceiling underlayment) 10A: No-en (a pair of no-en) 10B: No-en (between a pair of no-en) 21: Roof joist support (ceiling underlayment material) 22: Hanger (ceiling underlayment) 23: Hanging bolt (ceiling base material) 30: Ceiling base 40: Ceiling surface material 40A: First ceiling surface material (ceiling surface material) 40B: Second ceiling surface material (ceiling surface material) 41: Center of surface material 45: First end (surface material periphery) 48: Second end (surface material periphery) 50: First jig 51: Jig body 52: 1st piece 53:Second piece 55, 55A, 55B: Magnet 60: Second jig 61: Jig body 62: 3rd piece 63: 4th piece 65: Fastener alignment hole 68: Magnet 69: Hole 70: Fastener (screw) 70A: Main fixing part 72:Head 80A: Pre-ceiling surface material group (ceiling surface material group) 80B: Trailing ceiling material group (ceiling material group) 80C: Trailing ceiling material group (ceiling material group) 100: Building ceiling

Claims

1. A method for constructing a building ceiling by attaching a plurality of ceiling surface materials having a rectangular shape in plan view, the ceiling surface materials having a width spanning the plurality of furring strips, the furring strips having a pair of flanges and webs and extending in a first direction, and a pair of first ends parallel to the first direction and a pair of second ends parallel to the second direction, to a ceiling substrate having the webs facing downward and spaced apart in a second direction, A process includes temporarily fixing the first pieces of a pair of first jigs having an L-shaped cross section to the flanges of a pair of rafters, and sandwiching the pair of first end portions of a first ceiling surface material between the second pieces of the pair of first jigs and the webs of the pair of rafters, thereby temporarily fixing the first ceiling surface material to the pair of rafters; A process B includes overlapping one of the second ends of the second ceiling surface material with one of the second ends of the first ceiling surface material to form a first overlapping portion, and temporarily fixing the second ceiling surface material to the pair of joists via the pair of first jigs in a manner similar to that of the first ceiling surface material; A second jig having fastener alignment holes with a planar dimension larger than that of the fastener at positions corresponding to the plurality of furring strips is disposed at the first overlapping portion to temporarily fix the second jig to the furring strip, and the first overlapping portion is permanently fixed to the furring strip by a fastener through at least one of the fastener alignment holes; and A method for constructing a building ceiling, comprising a step D of removing the second jig and the first jig.

2. By carrying out the steps A to D, a group of leading ceiling surface materials extending in the first direction is constructed, The first end portions of the first ceiling panel are overlapped to form a second overlapping portion on the side of the preceding ceiling panel, and the steps A to D are carried out to construct a following ceiling panel extending in the first direction; The construction method for a building ceiling as described in claim 1, characterized in that in the construction of the subsequent ceiling surface material group, in step C, the second jig is arranged at the second overlap location in addition to the first overlap location to temporarily fix it to the rough joist, and the first overlap location and the second overlap location are finally fixed to the rough joist with fasteners through the fastener alignment holes.

3. 3. A method for constructing a building ceiling as described in claim 1 or 2, characterized in that a magnet is attached to the first piece of the first jig so as to be magnetically attracted to the flange of the rough joist.

4. the second jig has a third piece and a fourth piece having an L-shaped cross section, the third piece abutting against the first overlapping portion and the second overlapping portion, and the fourth piece being a handle; The method for constructing a building ceiling as described in claim 3, characterized in that the fourth piece of the second jig is equipped with a magnet that is magnetically attracted to the web of the joist.

5. The first jig has a length of the first end, The building ceiling construction method according to claim 4, characterized in that the second jig has a length equal to the sum of the length of the second end and the length of the intersection between the second end and the first end.

6. The ceiling surface material is A panel having a center and the first end and the second end on a periphery of the center of the panel, The center of the panel has a three-dimensional shape that is convex toward the interior side, The first end portion and the second end portion have a plate shape extending laterally from an end side of the center of the panel material, The method for constructing a building ceiling according to claim 5, wherein the product is a pulp moulded product.

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