Joint construction method

Abstract

To provide a joint construction method which does not require a special material and construction method, does not extend a construction period, and can stably make a joint inconspicuous over a long period of time.SOLUTION: A joint construction method includes the following steps of: (1) arranging an insulating material on a bottom surface of a recess provided along a joint formed by abutting wall panels; (2) filling the recess arranged with the insulating material with a sealing material; (3) pressing the sealing material filling the recess by a spatula on a wall panel surface; and (4) coating a finishing material onto the sealing material after drying and curing and the surface of the wall panel. The minimum width of the recess is 3 mm or more, a height to fill the recess with the sealing material from the insulating material is 4.5 mm or more and 20.5 mm or less. In the step (2), the sealing material having a predetermined volume loss (%) according to the filling height is used.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a joint construction method for filling a joint formed by butting wall panels together. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a technique for filling joints in exterior panels such as lightweight aerated concrete panels. In this type of technique, for example, a sealant is filled into the joints of the exterior panels in order to ensure waterproof performance. Here, even if a sealant is filled into the joints of the wall panels, the joints themselves remain as a pattern, so in order to make the joints less noticeable, it is necessary to fill the joints with mortar or putty on top of the sealant and then paint the finish. However, as the sealant dries and hardens, it loses volume, causing depressions in the areas that cover the joints, making it impossible to completely hide the joints, which can mar the aesthetic appearance, especially when a large-wall style finish is applied. For this reason, technologies have been developed to make the joints as inconspicuous as possible. For example, a method has been proposed in which an elastic mortar material is filled on top of the box-shaped sealing joints (see Patent Document 1), and a method has been proposed in which a crack prevention net is attached, and then mortar is applied over the net and a paint finish is applied (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 57-52905 [Patent Document 2] JP 2005-29995 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above method had the following problems. (1) Even if elastic mortar is used, it does not have the elasticity of a sealant, and cracks are more likely to occur than with sealant joints. (2) When attaching the crack prevention net, it is attached partially along the joints, so it is relatively easy to create unevenness. (3) Even if the loss (volume loss) of the mortar itself is small, since it is integrated with the sealant below, it may be pulled by the loss (volume loss) of the sealant itself, causing dents on the surface. (4) The final process of applying mortar to the entire surface and painting it requires a plasterer's trowel, which is time-consuming and costly. In addition, the overall finished thickness becomes considerably thick, and there is a possibility that the good breathability that the exterior panel originally possesses will be lost.

[0005] The present invention has been proposed in consideration of the above-mentioned conventional situation, and an object of the present invention is to provide a joint construction method that can stably make joints inconspicuous over the long term without requiring special materials or construction methods and without extending the construction period. [Means for solving the problem]

[0006] [1] Follow these steps: (1) placing an insulating material on the bottom surface of a recess provided along the joint formed by butting wall panels together; (2) filling the recess in which the insulating material is disposed with a sealant; (3) pressing the sealant filled in the recess onto the surface of the wall panel with a spatula; and (4) applying a finish material to the surface of the sealant and the wall panel after drying and hardening; having The minimum width of the recess is 3 mm or more, and the filling height of the sealing material from the insulating material into the recess is 4.5 mm or more and 20.5 mm or less, A joint construction method characterized in that in the step (2), a sealant having a predetermined volume loss (%) is used depending on the filling height. [2] The joint construction method described in [1], wherein in the step (2), a sealant filled into the recess has a volume loss (%) such that the amount of depression on the surface after drying and hardening is 0.2 mm or less. [3] The joint construction method according to [1] or [2], wherein in the step (3), the surface of the sealant filled in is pressed with a spatula so that the surface is within a range of -0.3 mm to +0.3 mm from the surface of the wall panel. [4] The joint construction method described in [1], wherein the sum of the finishing position of the sealant surface pressed with a spatula from the wall panel surface in step (3) and the amount of depression of the surface of the sealant filled in the depression after drying and hardening is less than the film thickness of the finishing material after drying. [5] The joint construction method according to any one of [1] to [4], wherein the film thickness of the finishing material after drying is 0.5 mm or more. [6] A joint construction method according to any one of [1] to [5], wherein in step (2), when the filling height is 4.5 mm or more and 5.5 mm or less, a sealant having a volume loss (%) upon drying and hardening of 8% or less is used. [7] A joint construction method according to any one of [1] to [5], wherein in step (2), when the filling height is greater than 5.5 mm and not greater than 6.5 mm, a sealant having a volume loss (%) of 6% or less due to drying and hardening is used. [8] A joint construction method described in any of [1] to [5], wherein in step (2), when the filling height is greater than 6.5 mm and not more than 8.5 mm, a sealant having a volume loss (%) of 5% or less due to drying and hardening is used. [9] A joint construction method according to any one of [1] to [5], wherein in step (2), when the filling height is greater than 8.5 mm and not greater than 10.5 mm, a sealant having a volume loss (%) of 4% or less due to drying and hardening is used.

[10] A joint construction method described in any of [1] to [5], wherein in step (2), when the filling height is greater than 10.5 mm and not greater than 13.5 mm, a sealant having a volume loss (%) of 3% or less due to drying and hardening is used.

[11] A joint construction method described in any of [1] to [5], wherein in step (2), when the filling height is greater than 13.5 mm and not greater than 20.5 mm, a sealant having a volume loss (%) of 2% or less due to drying and hardening is used.

[12] A wall structure assembled using the joint construction method described in any one of [1] to

[11] .

[13] An insulating material is provided on a bottom surface of a recess provided along a joint where the wall panels are butted together; a sealing material filled in the recess in which the insulating material is disposed; a finishing material applied to the surface of the sealant and the wall panel; The minimum width of the recess is 3 mm or more, and the filling height of the sealing material from the insulating material into the recess is 4.5 mm or more and 20.5 mm or less, A wall structure in which the sealant has a volume loss (%) upon drying and hardening that has a predetermined value according to the filling height. Effect of the Invention

[0007] According to the present invention, it is possible to provide a joint construction method that can stably make joints less noticeable over the long term without requiring special materials or construction methods and without extending the construction period. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view showing a wall panel structure. [Diagram 2] FIG. 11 is an enlarged cross-sectional view of a recess formed along a joint where wall panels are butted together. [Diagram 3] FIG. 4 is an enlarged cross-sectional view of the recess showing a state in which an insulating material is disposed. [Figure 4]4 is an enlarged cross-sectional view of a recess showing a state in which a sealing material is filled on top of an insulating material. FIG. [Diagram 5] FIG. 4 is an enlarged cross-sectional view of a recess showing a state in which the sealing material has dried and hardened. [Figure 6] 1 is an enlarged cross-sectional view showing a recess with a finishing material applied to the filling surface of the sealant. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment shows an example of a joint construction method for a wall panel, but the present invention is not limited to this embodiment and may be modified or applied to other things.

[0010] Fig. 1 is a cross-sectional view showing a wall panel structure. Fig. 2 is an enlarged cross-sectional view of a recess formed along a joint where wall panels are butted together. Fig. 3 is an enlarged cross-sectional view of the recess showing a state where an insulating material is arranged. Fig. 4 is an enlarged cross-sectional view of the recess showing a state where a sealant is filled on top of the insulating material. Fig. 5 is an enlarged cross-sectional view of the recess showing a state where the sealant has dried and hardened. Fig. 6 is an enlarged cross-sectional view of the recess showing a state where a finishing material has been applied to the filled surface of the sealant.

[0011] As shown in FIG. 1, a wall panel structure 5 (wall structure) assembled using the joint construction method according to this embodiment is formed by attaching a plurality of wall panels 1 arranged on the outermost side to a pillar or partition (hereinafter collectively referred to as "pillar") W1 with screws 4, via a moisture-permeable waterproof sheet 2 and a wooden or resin furring strip, in that order, on the outer side of the pillar or partition W1. A joint 1a is formed at the boundary where the wall panels 1 are butted together. Furthermore, in the wall panel structure 5, the wall panels 1, including the joint 1a, are covered with a finishing material 13, and a predetermined finishing process is performed for the purpose of forming a planar design for a long period of time. The wall panel 1 is a concrete member that can be used as an exterior wall material, for example, an aerated lightweight concrete panel (ALC panel) such as "Hebel Power Board" (registered trademark). Other wall panels that can be used include precast concrete panels, extruded cement panels, and siding panels. In the following, an ALC panel is used as an example of the wall panel 1.

[0012] The length of the wall panel 1 is about 1800 mm to 2000 mm, and the thickness of the wall panel 1 is about 35 mm to 100 mm. The width in the direction perpendicular to the length of the wall panel 1 is about 500 to 700 mm. The wall panel 1 may be cut before use, and may be cut to a length or width of about 100 mm, for example.

[0013] A notch 1b is formed along the periphery of at least one surface of the wall panel 1, specifically, the surface facing the room when used as an exterior wall material (the surface opposite to the side attached to the partition wall). When the ends of two wall panels 1 are butted together, a butt joint 1c is formed by the butt joint, and a recess 10 is formed by the notches 1b facing each other across the butt joint 1c (see FIG. 2).

[0014] As shown in FIG. 2, the shape of the recess 10 when viewed in cross section is a rectangle with one side open.

[0015] The joint construction method of the present invention comprises the following steps: (1) A step of disposing an insulating material 11 on a bottom surface 10a of a recess 10 provided along a joint 1a formed by butting together wall panels 1; (2) filling the recess 10 in which the insulating material 11 is disposed with a sealant 12; (3) pressing the sealant 12 filled in the recess 10 against the surface of the wall panel 1 with a spatula; and (4) applying a finishing material 13 to the surface of the sealant 12 and the wall panel 1 after drying and hardening; having The minimum width w of the recess 10 is 3 mm or more, and the filling height t of the sealing material 12 from the insulating material 11 into the recess 10 is 4.5 mm or more and 20.5 mm or less, In step (2), a sealant 12 having a predetermined volume loss (%) is used according to the filling height t.

[0016] According to the joint construction method of the present invention, it is possible to suppress the occurrence of dents in the painted surface caused by volume loss of the sealant 12, and therefore to achieve a smooth painted surface in which the joints 1a are less noticeable.

[0017] The joint construction method of the present invention is a rational method for solving the problems described above, and can be said to be an ideal method in that it does not require special materials or construction methods compared to the usual joint treatment and painting finishing methods, and can stably make the joints 1a less noticeable over the long term without extending the construction period. Each step will be explained below.

[0018] (1) An insulating material 11 is placed on the bottom surface 10a of a recess 10 provided along a joint 1a formed when wall panels 1 are butted together. After multiple wall panels 1 are attached to the columns W1 in their designated positions, insulating material 11 is placed on the bottom surface 10a of the recesses 10 formed along the joints 1a, as shown in Figures 2 and 3. The insulating material 11 is placed after a dedicated primer is applied inside the recesses 10. The main purpose of the insulating material 11 is to prevent the sealant 12 from adhering and fixing to the bottom of the joints of the wall panels 1 (bottom surface 10a).

[0019] It is particularly important that the insulating material 11 is a material that does not adhere to the sealing material 12, and can be appropriately selected according to the material of the sealing material 12, for example, a bond breaker (also known as "insulating tape") or a backup material can be used. As a result, the sealing material 12 filled on the insulating material 11 in step (2) is in a two-sided adhesion state on both side surfaces 10b of the recess 10, and the thinning (volume loss) on the surface can be suppressed to about half of that in a three-sided adhesion state (see FIG. 5).

[0020] When a bond breaker is used in the insulating material 11, a material that matches the material of the sealing material 12 (a material that does not adhere) should be used from among polyurethane, polysulfide, polyisobutylene, silicone, modified silicone, etc. When a backup material is used, a polyethylene foam or the like is used. Also, from the viewpoint of ease of placement on the bottom surface 10a, it is preferable that one side of the insulating material 11 (the side that contacts the bottom surface 10a) has adhesiveness.

[0021] (2) The sealing material 12 is filled into the recess 10 in which the insulating material 11 is disposed. As shown in FIG. 4, the insulating material 11 is placed on the bottom surface 10a of the recess 10, and then the recess 10 is filled with a sealing material 12.

[0022] The sealant 12 is selected taking into consideration its suitability for the ALC joint, for example, watertightness, airtightness, conformability, and volume loss. The volume loss of the sealant is a value calculated by a volume change (loss) measurement test in accordance with JIS A 5758 2016 (6.11 Volume loss). The test equipment used in the volume change (loss) measurement test is in accordance with JIS A 1439, 5.11.1. The volume change (loss) measurement test is performed using a method in accordance with JIS A 1439, 5.11.2.

[0023] In this embodiment, the various materials exemplified above can be used as the sealant 12, but it is preferable that the sealant is a non-bleeding type. When a non-bleeding type sealant is used, the occurrence of bleeding phenomena such as blackening and stickiness can be suppressed.

[0024] In particular, in the joint construction method of the present invention, in step (2), a sealant 12 having a predetermined volume loss (%) according to the filling height t is used. The predetermined volume loss (%) according to the filling height t is the percentage of wall thinning that occurs with drying and hardening, and is a value obtained by calculation in advance. Specifically, a sealant 12 is used that is filled into the recess 10 at the predetermined filling height t and has a volume loss (%) such that the recess amount s of the surface (front surface) after drying and hardening is 0.2 mm or less.

[0025] Here, as shown in FIG. 5, when the sealant 12 is cured for a predetermined period of time, the sealant 12 loses volume and shrinks. When the sealant 12 loses volume, the shrinkage occurs around the adhesive area with the wall panel 1 that is surface-bonded. The insulating material 11 placed before the sealant 12 is filled is made of a material that does not adhere to the sealant 12, and a non-adhesive area is formed between the sealant 12 and the insulating material 11. Therefore, the shrinkage occurs on both the front surface of the sealant 12 (the front surface of the wall panel 1) and the back surface (the insulating material 11 side). In other words, a part of the loss of the sealant 12 (for example, about half) is absorbed in the non-adhesive area, so that the overall shrinkage occurring on the front side of the wall panel 1 can be reduced to about half compared to when the insulating material 11 is not placed.

[0026] The amount of recess s on the surface of the sealant 12 was calculated as follows. For example, as shown in Figures 4 and 5, the recess 10 has a rectangular shape with one side open when viewed in cross section, and the filling height t is 8 mm in a box-shaped joint with a width (joint width) w of 7 mm and a depth d of 10 mm will be described as an example. In this case, the filling cross-sectional area of ​​the sealant 12 is 7 mm × 8 mm = 56 mm 2When the volume loss of the sealing material 12 is 10%, the lost cross-sectional area (volume loss cross-sectional area) is 56 mm 2 ×10%=5.6mm 2 If the volume loss is assumed to occur at the top and bottom of the sealing material 12, the cross-sectional area of ​​the volume loss on the top (surface) side is half, 2.8 mm 2 The amount of depression on the top surface is 2.8 mm. 2 / 7mm=0.40mm.

[0027] Table 1 shows the calculation results of the amount of recess s on the surface side after drying and hardening when the volume loss (%) of the sealant 12 is 0% to 15%. The volume loss (%) at which the amount of recess s on the surface side of the sealant 12 is 0.2 mm or less is 5%.

[0028] [Table 1]

[0029] Using the same method as above, the depression depth s of the surface of the sealant 12 after drying and hardening was determined for depressions 10 with widths (joint widths) w of 3 mm to 20 mm and filling heights t of the sealant 12 of 5 mm to 20 mm. The relationship between the filling height t of the sealant 12 and the volume loss (%) at which the surface depression amount s after drying and hardening is 0.2 mm or less was then summarized. The results are shown in Table 2.

[0030] [Table 2]

[0031] As shown in Table 2, when the filling height t of the sealant 12 is 5 mm (4.5 mm or more and 5.5 mm or less), it is preferable to use a sealant whose volume loss (%) is 8% or less. When the filling height t of the sealant 12 is 6 mm (more than 5.5 mm and 6.5 mm or less), it is preferable to use a sealant whose volume loss (%) is 6% or less. When the filling height t of the sealant 12 is 7 mm (more than 6.5 mm and 8.5 mm or less), it is preferable to use a sealant whose volume loss (%) is 5% or less. When the filling height t of the sealing material 12 is 8 to 10 mm (more than 8.5 mm and less than 10.5 mm), it is preferable to use a sealant with a volume loss (%) of 4% or less, when the filling height t of the sealing material 12 is 10 to 13 mm (more than 10.5 mm and less than 13.5 mm), it is preferable to use a sealant with a volume loss (%) of 3% or less, and when the filling height t of the sealing material 12 is 13 to 20 mm (more than 13.5 mm and less than 20.5 mm), it is preferable to use a sealant with a volume loss (%) of 2% or less. The filling height t and the volume loss (%) are specified with a margin of ±0.5 mm from the above calculation results.

[0032] For example, if the filling height t is 8 mm, from the table above, use "sealant 12 with a volume loss (%) of 5% or less." Volume loss (%) of 4% or 3% is also acceptable, but generally the lower the volume loss (%), the more specialized the sealant is, and the more difficult it is to obtain. The price also tends to be higher. According to the method of the present embodiment, it is possible to use a general sealant of, for example, about 8% to 5%, without using a special sealant, and it is possible to reduce the cost of materials.

[0033] For example, examples of sealing materials with a volume loss (%) of 8% or less include "Penguin Seal 999 Type NB" (volume loss 7%) manufactured by Sunstar Engineering Co., Ltd. and "Auton Smart Seal WJ" (volume loss 7.1%) manufactured by Auto Chemical Industry Co., Ltd.

[0034] In this step, a sealant 12 having a predetermined volume loss (%) is selected according to the filling height t, and the sealant 12 is filled to the extent that it slightly protrudes from the surface of the wall panel 1.

[0035] In addition, the relationship between the filling height t of the sealant 12 and the volume loss (%) in this embodiment can be applied to recesses 10 in which the minimum value of the joint width w is 3 mm or more and the filling height t of the sealant 12 is 5 mm to 20 mm. However, from the standpoint of more accurate construction and practicality, it is preferable that the joint width w is 3 mm to 20 mm.

[0036] In addition, the recess 10 can be applied not only to a recess having a rectangular cross section in which the width (joint width) is constant along the depth direction, but also to a joint in which the joint width varies along the depth direction, for example, a recess having an approximately inverted trapezoidal cross section in which the width on the opening side is larger than the width on the bottom side, or a recess having a step.

[0037] (3) The sealant 12 filled in the recess 10 is pressed onto the surface of the wall panel 1 with a spatula. After filling the recess 10 with the sealant 12, the surface of the sealant 12 is treated by pressing it with a spatula so as to be flat against the surface of the wall panel 1.

[0038] It is preferable to press the surface of the sealing material 12 with a spatula so that the surface of the sealing material 12 is in the range of −0.3 mm to +0.3 mm with respect to the surface of the wall panel 1. In this specification, when the surface of the sealing material 12 is convex with respect to the surface of the wall panel 1, it is considered to be positive (+), and when it is concave, it is considered to be negative (-). For the spatula holder, in addition to using a typical spatula with a flat tip, it is possible to keep the construction accuracy within the above range by using a spatula with a slight R-shaped notch at the tip.

[0039] Thereafter, the sealant 12 is cured for a prescribed period of time. As the sealant 12 dries and hardens, it loses volume (shrunk). Generally, many sealants lose about 5-10% of their volume over time, and the prescribed period is a period during which this shrinkage subsides. Specifically, the prescribed period is preferably 3 days or more. A period of more than 20 days is preferable because there is almost no shrinkage (volume loss), but considering that this may extend the construction period, a period of 14 days or less is preferable, and 5-10 days is even more preferable.

[0040] Immediately after the sealant 12 is pressed, the finishing position of the sealant 12 is in the range of -0.3 mm to +0.3 mm from the panel surface, but in reality, due to volume loss as the sealant 12 dries and hardens, a further depression will occur on the surface from this position.

[0041] As described above, in the present invention, the sealant 12 used has a volume loss (%) determined by the filling height t, so that the amount of depression s after drying and hardening is suppressed to 0.2 mm or less.

[0042] The spatula pressure keeps the surface of the sealant 12 within the range of -0.3 mm to +0.3 mm from the surface of the wall panel 1, so even if the sealant 12 is further recessed by 0.2 mm as it dries and hardens, the final surface position of the sealant 12 will be within the range of -0.5 (= -0.3 - 0.2) mm to +0.1 (= +0.3 - 0.2) mm from the panel surface.

[0043] (4) After drying and hardening, the sealant 12 and the surface of the wall panel 1 are coated with a finishing material 13. As shown in FIG. 6, a finishing material 13 is applied to the surface of the wall panel 1 including the surface of the sealant 12, and then, for example, when the outside temperature is 23° C., it is left to cure for 24 hours or more to complete the finish.

[0044] The finishing material 13 used in the present invention can be a wide variety of coating materials used for surface coating of ALC panels. The coating materials referred to here refer to multi-layer finishing coating materials, thin-applied finishing coating materials, and thick-applied finishing coating materials as defined in JIS A 6909 (2014).

[0045] The finishing material 13 is preferably composed of a base coat material + main material + top coat material, a base coat material + main material, or only the main material. In addition, any of the known shapes such as citron skin, ripple, uneven, sand wall, earthen wall, plaster, stucco, Kyoto wall, fiber wall, scraped off, flat, etc. can be used for the shape of the finished surface. Among these, even in the case of a finish that is close to flat such as sand wall, plaster, Kyoto wall, flat, etc., it is possible to finish so that the joint 1a is almost invisible by using the joint construction method of the present invention. The thickness of the finishing material 13 after drying is preferably 0.5 mm or more and 20 mm or less, more preferably 1 mm or more and 10 mm or less.

[0046] The surface of the sealant 12 after drying and hardening is within the range of -0.5 mm to +0.1 mm with respect to the surface of the wall panel 1, and by making the layer thickness of the primer after drying 0.5 mm or more, depressions in the surface of the sealant 12 can be filled with the primer to create a flat surface.

[0047] Since the surface can already be made flat after the undercoat is applied, even if further undercoats and topcoats are applied, the final finish can produce the desired flat design, such as a large wall look. By painting the entire surface of the wall panel 1 with a finishing material 13, the joints 1a can be made less noticeable, making it possible to realize a desired planar design, such as a large wall look.

[0048] In the joint construction method of this embodiment, the sum of the finishing position of the surface of the sealant 12 pressed with a spatula from the surface of the wall panel 1 in step (3) and the amount of depression of the surface of the sealant 12 filled in the recess 10 after drying and hardening can be set to be equal to or less than the film thickness of the finishing material 13 after drying.

[0049] An example will be described in which a sealant 12 having a volume loss (%) of 0.3 mm after drying and hardening is used, and the finishing position of the sealant 12 immediately after pressing is set to ±0.2 mm from the panel surface.

[0050] In this case, the final surface position of the sealant 12, which is further recessed by 0.3 mm due to drying and hardening of the sealant 12, i.e., the total amount of the finishing position (±0.2 mm) and the recess amount (0.3 mm), is in the range of -0.5 (=-0.2-0.3) mm to -0.1 (=+0.2-0.3) mm. By setting a combination of the finishing position by the spatula press, the recess amount of the sealant 12, and the film thickness of the finishing material 13 after drying so that this value is equal to or less than the film thickness of the finishing material 13 after drying, the recesses on the surface of the sealant 12 can be filled with the undercoat material to create a flat state.

[0051] For example, by setting the surface of the sealant 12 after drying and hardening to within a range of -0.5 mm to -0.1 mm with respect to the surface of the wall panel 1 and making the layer thickness of the primer after drying 0.5 mm or more, depressions in the surface of the sealant 12 can be filled with the primer to create a flat surface.

[0052] By carrying out each of the above steps, a wall panel structure 5 (wall structural body) is formed. As shown in Figures 1 and 6, the wall panel structure 5 has a recess 10 provided along the joint 1a of the wall panel 1. An insulating material 11 is disposed on the bottom surface 10a of the recess 10, and a sealant 12 is disposed on the insulating material 11. The entire surface of the wall panel 1, including the filled surface of the sealant 12, is covered with a finishing material 13.

[0053] In this construction method, in which the minimum width (joint width) w of the recess 10 is 3 mm or more, the filling height t of the sealant 12 into the recess 10 is 5 mm to 20 mm, and a sealant 12 having a predetermined volume loss (%) according to the filling height t is used, the occurrence of dents in the painted surface due to volume loss of the sealant 12 can be suppressed, and therefore a smooth painted surface can be finished in which the joints 1a are less noticeable.

[0054] In addition, since the insulating material 11 is placed in the recess 10 before filling with the sealant 12, adhesion between the sealant 12 and the back side of the joint of the wall panel 1 is suppressed, and a non-adhesive area is formed on the back side of the joint of the recess 10. Therefore, at least a part of the shrinkage that occurs in the sealant 12 is absorbed in the non-adhesive area on the back side of the joint, and the shrinkage that occurs on the side to which the finishing material 13 is applied is reduced. As a result, this is effective in making the joint 1a less noticeable after the finishing material 13 is applied.

[0055] Even if the sealing material 12 shrinks due to aging, some of the shrinkage is absorbed in the non-adhesive areas that are free (not restrained by the insulating material 11, etc.). Therefore, it is possible to achieve a smooth painted surface with inconspicuous joints 1a for a long period of time.

[0056] As described above, the joint construction method according to this embodiment does not require special materials or construction methods compared to the usual joint treatment and painting finishing methods, does not involve an extension of the construction period, and can maintain stable joint performance over the long term. The joint construction method according to this embodiment can comprehensively solve the problems of the conventional corresponding technologies, and is extremely advantageous in that it can be used to form large-wall-like planar designs over a long period of time.

[0057] Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be modified as appropriate without departing from the spirit of the invention.

[0058] For example, in the above-described embodiment, a primer treatment is appropriately performed, and as a result, the stabilization of the adhesive surface can be ensured, and further, deterioration of the insulating material and the sealing material can be suppressed, which is preferable. The primer treatment may be omitted as appropriate.

[0059] The joint construction method of the present invention described above can also be applied to an assembly method for a wall structure (wall) having a plurality of wall panels, and to a construction method for a building having a wall having a plurality of wall panels.

[0060] Furthermore, the scope of the present invention also extends to a wall structure assembled using the joint construction method of the present invention.

[0061] In addition, the wall panel configuration is usually "horizontal" and "vertical", but in either configuration, in addition to the "large wall design" that makes all joints inconspicuous, "design patterns that make horizontal joints inconspicuous and only vertical joints visible", "design patterns that make vertical joints inconspicuous and only horizontal joints visible", "design patterns that make some vertical and horizontal joints inconspicuous and show large grids" can be formed according to preference. In addition, when forming such a pattern, the parts where the joints are to be shown are held down by general sealing (held down by 2 to 3 mm), and the parts where the joints should not be made noticeable are applied with the joint construction method of the present invention, thereby constructing an exterior wall panel with a design application pattern of a large wall grid. The above-mentioned design patterns can be applied to the walls of individual homes, stores, and office buildings, and can respond to the preferences of designers and clients who want to emphasize only horizontal joints or only vertical joints, or make the entire joints inconspicuous and create a large wall design. [Industrial Applicability]

[0062] The construction method according to the present invention does not require special materials or construction methods, does not involve an extension of the construction period, and can make the joints less noticeable, making it widely usable as a joint construction method for filling the joints between wall panels. [Explanation of symbols]

[0063] 1: Wall panel 1a: Joint 1b: Notch 1c: Butt joint 2: Breathable waterproof sheet 3:Furring strip 4: Screw 5: Wall panel structure 10: Recess 10a: Bottom 10b: Side 11: Insulation material 12: Sealing material 13: Finishing materials d:Depth s: amount of dent t: filling height w:Minimum width

Claims

1. Steps below: (1) placing an insulating material on the bottom surface of a recess provided along a joint formed by butting wall panels together; (2) filling the recess in which the insulating material is disposed with a sealant; (3) pressing the sealant filled in the recess on the surface of the wall panel with a spatula; and (4) applying a finish to the surface of the sealant and the wall panel after drying and hardening; having The minimum width of the recess is 3 mm or more, and the filling height of the sealing material from the insulating material into the recess is 4.5 mm or more and 20.5 mm or less, A joint construction method characterized in that in the step (2), a sealant having a predetermined volume loss (%) is used depending on the filling height.

2. The joint construction method according to claim 1, wherein in step (2), a sealant is used that has a volume loss (%) such that the amount of depression on the surface of the sealant filled in the recess after drying and hardening is 0.2 mm or less.

3. 3. The joint construction method according to claim 1 or 2, wherein in the step (3), the surface of the sealant filled in is pressed with a spatula so that the surface is in the range of -0.3 mm to +0.3 mm from the surface of the wall panel.

4. 2. The joint construction method according to claim 1, wherein in step (3), the sum of the finishing position of the spatula-pressed sealant surface from the wall panel surface and the amount of depression of the sealant filled in the depression after drying and hardening is equal to or less than the film thickness of the finishing material after drying.

5. The joint construction method according to any one of claims 1 to 4, wherein the film thickness of the finishing material after drying is 0.5 mm or more.

6. A joint construction method according to any one of claims 1 to 5, wherein in step (2), when the filling height is 4.5 mm or more and 5.5 mm or less, a sealant having a volume loss (%) of 8% or less due to drying and hardening is used.

7. A joint construction method according to any one of claims 1 to 5, wherein in step (2), when the filling height is greater than 5.5 mm and is equal to or less than 6.5 mm, a sealant having a volume loss (%) of 6% or less due to drying and hardening is used.

8. The joint construction method according to any one of claims 1 to 5, wherein in the step (2), when the filling height is greater than 6.5 mm and is equal to or less than 8.5 mm, a sealant having a volume loss (%) of 5% or less due to drying and hardening is used.

9. A joint construction method according to any one of claims 1 to 5, wherein in step (2), when the filling height is greater than 8.5 mm and less than or equal to 10.5 mm, a sealant having a volume loss (%) of 4% or less due to drying and hardening is used.

10. A joint construction method according to any one of claims 1 to 5, wherein in step (2), when the filling height is greater than 10.5 mm and less than or equal to 13.5 mm, a sealant having a volume loss (%) of 3% or less due to drying and hardening is used.

11. A joint construction method according to any one of claims 1 to 5, wherein in step (2), when the filling height is greater than 13.5 mm and less than or equal to 20.5 mm, a sealant having a volume loss (%) of 2% or less due to drying and hardening is used.

12. A wall structure assembled using the joint construction method according to any one of claims 1 to 11.

13. An insulating material is disposed on a bottom surface of a recess provided along a joint where the wall panels are butted together; a sealing material filled in the recess in which the insulating material is disposed; a finishing material applied to the surface of the sealant and the wall panel; The minimum width of the recess is 3 mm or more, and the filling height of the sealing material from the insulating material into the recess is 4.5 mm or more and 20.5 mm or less, A wall structure, wherein the sealant has a volume loss (%) upon drying and hardening that has a predetermined value depending on the filling height.

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