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 method for filling joints formed by abutting wall panels against each other.

Background Art

[0002] Conventionally, a technique for filling joints of exterior panels such as lightweight foamed concrete panels has been known. In this type of technique, for example, a sealing material is filled in the joints of the exterior panels in order to ensure waterproof performance. Here, even if a sealing material is filled in the joints of the wall panels, the joints themselves remain as patterns. Therefore, in order to make these joints less noticeable, it is necessary to fill a mortar material, a putty material, etc. over the sealing material to fill the joints and then perform a painting finish. However, since the volume of the sealing material is lost as it dries and hardens, a dent occurs in the portion covering the joints, and the joints cannot be completely hidden, and particularly when a large-wall-like finishing treatment is performed, there is a risk of impairing the aesthetic appearance. For this reason, techniques have been developed to make the joints as inconspicuous as possible. For example, a method of filling an elastic mortar material over a box-shaped sealing joint portion (see Patent Document 1), and further, a method of attaching a net for preventing cracks, applying mortar over the entire surface, and then performing a painting finish (see Patent Document 2) have been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above construction method had the following problems: (1) Even when elastic mortar is used, it does not have the same elasticity as sealant, and is more prone to cracking compared to sealant joints. (2) When applying the crack-preventing net, it is applied only partially along the joint, so unevenness is relatively likely to occur. (3) Even if the shrinkage (volume loss) of the mortar material itself is small, because it is integrated with the sealant material below, it is pulled down by the shrinkage (volume loss) of the sealant itself, which may cause indentations on the surface. (4) The final step of applying mortar to the entire surface and painting requires the use of a trowel, which is time-consuming and costly. In addition, the overall finish thickness becomes considerably thick, which may eliminate the good breathability that the exterior panels originally possess.

[0005] This invention was proposed in view of the above-mentioned conventional circumstances, and the object of this invention is to provide a jointing method that can make joints less noticeable over the long term without requiring special materials or construction methods, and without extending the construction period. [Means for solving the problem]

[0006] [1] The following steps: (1) A step of placing insulating material on the bottom surface of a recess provided along the joint formed by the butt joint between wall panels; (2) A step of filling the recess in which the insulating material is placed with a sealing material; (3) The step of pressing down the sealing material filled in the recess with a spatula on the surface of the wall panel; and (4) A step of applying a finishing material to the surface of the sealant and the wall panel after drying and hardening; It has, 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 jointing method characterized in that, in step (2) above, a sealing material having a predetermined volume loss (%) is used according to the filling height. [2] The joint construction method according to [1], wherein in step (2), a sealant having a volume loss (%) such that the amount of surface depression of the sealant filled in the recess after drying and hardening is 0.2 mm or less. [3] The joint construction method according to [1] or [2], wherein in step (3), the surface of the sealing material when it is filled is pressed with a spatula so that it is in the range of -0.3 mm to +0.3 mm relative to the surface of the wall panel. [4] The joint construction method according to [1], wherein in step (3), the sum of the finished position of the surface of the sealant pressed with a spatula from the surface of the wall panel and the amount of surface recession of the sealant filled in the recess after drying and hardening is less than or equal to the film thickness of the finishing material after drying. [5] A jointing 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] In step (2) above, if the filling height is 4.5 mm or more and 5.5 mm or less, a sealant with a volume loss (%) due to drying and hardening of 8% or less is used, as described in any of [1] to [5]. [7] In step (2) above, if the filling height is greater than 5.5 mm and 6.5 mm or less, a sealant with a volume loss (%) due to drying and hardening of 6% or less is used, as described in any of [1] to [5]. [8] In step (2) above, if the filling height is greater than 6.5 mm and 8.5 mm or less, a sealant with a volume loss (%) due to drying and hardening of 5% or less is used, as described in any of [1] to [5]. [9] In step (2) above, if the filling height is greater than 8.5 mm and less than or equal to 10.5 mm, the joint construction method according to any one of [1] to [5] is used, wherein a sealant with a volume loss (%) due to drying and hardening of 4% or less is used.

[10] In the step (2), when the filling height is more than 10.5 mm and not more than 13.5 mm, a sealing material with a volume loss (%) due to dry hardening of not more than 3% is used, and the joint construction method according to any one of [1] to [5].

[11] In the step (2), when the filling height is more than 13.5 mm and not more than 20.5 mm, a sealing material with a volume loss (%) due to dry hardening of not more than 2% is used, and the joint construction method according to any one of [1] to [5].

[12] A wall structure assembled including the joint construction method according to any one of [I] to [II].

[13] An insulating material arranged on the bottom surface of a recess provided along a joint where wall panels are butted against each other, A sealing material filled in the recess where the insulating material is arranged, And a finishing material applied to the surfaces of the sealing material and the wall panel, The minimum width of the recess is 3 mm or more, the filling height of the sealing material from the insulating material into the recess is 4.5 mm or more and not more than 20.5 mm, The sealing material has a volume loss (%) in dry hardening having a predetermined value according to the filling height, and the wall structure. [Advantages of the Invention]

[0007] According to the present invention, it is possible to provide a joint construction method that can stably make the joint inconspicuous in the long term without requiring special materials or construction methods and without prolonging the construction period. [Brief Description of the Drawings]

[0008] [Figure 1] It is a cross-sectional view showing a wall panel structure. [Figure 2] It is an enlarged cross-sectional view of a recess formed along a joint where wall panels are butted against each other. [Figure 3] It is an enlarged cross-sectional view of a recess showing a state where an insulating material is arranged. [Figure 4]It is an enlarged cross-sectional view of a recess showing a state where a sealing material is filled on an insulating material. [Figure 5] It is an enlarged cross-sectional view of a recess showing a state where the sealing material has dried and hardened. [Figure 6] It is an enlarged cross-sectional view of a recess showing a state where a finishing material is applied to the filling surface of the sealing material.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment shows an example of a joint method for wall panels, and the present invention is not limited to this, 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 abutted against each other. FIG. 3 is an enlarged cross-sectional view of a recess showing a state where an insulating material is arranged. FIG. 4 is an enlarged cross-sectional view of a recess showing a state where a sealing material is filled on the insulating material. FIG. 5 is an enlarged cross-sectional view of a recess showing a state where the sealing material has dried and hardened. FIG. 6 is an enlarged cross-sectional view of a recess showing a state where a finishing material is applied to the filling surface of the sealing material.

[0011] As shown in Figure 1, the wall panel structure 5 (wall surface structure) assembled with the joint method according to this embodiment is formed by attaching a plurality of wall panels 1, which are positioned on the outermost side, to the columns or studs (hereinafter collectively referred to as "columns") W1 via a breathable waterproof sheet 2 and wooden or resin furring strips in that order. The outermost wall panels 1 are attached to the columns W1 with screws 4. A joint 1a is formed at the boundary where the wall panels 1 butt 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 treatment is applied for the purpose of forming a planar design over a long period of time. The wall panels 1 are concrete members that can be used as exterior wall materials, such as lightweight aerated concrete panels (ALC panels) such as "Hevel Powerboard" (registered trademark). Other wall panels that can be used include precast concrete panels, extruded cement boards, and siding panels. In the following, ALC panels will be used as an example of wall panels 1.

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

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

[0014] As shown in Figure 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 consists of the following steps: (1) A step of placing an insulating material 11 on the bottom surface 10a of a recess 10 provided along the joint 1a formed by the wall panels 1 butting together; (2) Fill the recess 10 where the insulating material 11 is placed with the sealing material 12; (3) The step of pressing the sealant 12 filled in the recess 10 onto the surface of the wall panel 1 with a spatula; and (4) A step of applying the finishing material 13 to the surface of the sealant 12 and wall panel 1 after drying and hardening; It has, The minimum width w of the recess 10 is 3 mm or more, and the filling height t of the sealing material 12 into the recess 10 from the insulating material 11 is 4.5 mm or more and 20.5 mm or less. In step (2), a sealing material 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, the occurrence of depressions in the painted surface caused by volume loss of the sealant 12 can be suppressed, and therefore, a smooth painted surface in which the joint 1a is less noticeable can be achieved.

[0017] The joint filling method of the present invention is a rational method for solving the above-mentioned problems, and it can be said to be an ideal method that can make joints 1a less noticeable in the long term without requiring special materials or construction methods, and without extending the construction period, compared to conventional joint treatment and painting finishing methods. The following explains each step.

[0018] (1) An insulating material 11 is placed on the bottom surface 10a of a recess 10 provided along the joint 1a formed when two wall panels 1 are joined together. After attaching multiple wall panels 1 to predetermined positions on the column W1, insulating material 11 is placed on the bottom surface 10a of the recess 10 formed along the joint 1a, as shown in Figures 2 and 3. The insulating material 11 is placed after applying a special primer to the recess 10. The main purpose of the insulating material 11 is to prevent the sealant 12 from adhering and fixing to the bottom of the joint (bottom surface 10a) of the wall panel 1.

[0019] In particular, it is important that the insulating material 11 is a component 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, in step (2), the sealing material 12 that is filled on top of the insulating material 11 will be in a two-sided adhesion state on both sides 10b of the recess 10, and the surface shrinkage (volume loss) can be reduced to about half that of a three-sided adhesion state (see Figure 5).

[0020] Furthermore, when a bond breaker is used in the insulating material 11, one that matches the material of the sealing material 12 (one that does not adhere) should be used from among polyurethane, polysulfide, polyisobutylene, silicone, modified silicone, etc. When a backup material is used, polyethylene foam or the like should be used. In addition, for ease of placement on the bottom surface 10a, it is preferable that one side of the insulating material 11 (the side in contact with the bottom surface 10a) is adhesive.

[0021] (2) Fill the recess 10 where the insulating material 11 is placed with the sealing material 12. As shown in Figure 4, after placing the insulating material 11 on the bottom surface 10a of the recess 10, the sealing material 12 is then filled into the recess 10.

[0022] The sealant 12 is selected considering its suitability for ALC joints, such as watertightness, airtightness, conformability, and volume loss. The volume loss of the sealant is calculated by a volume change (loss) measurement test in accordance with JIS A 5758 2016 (6.11 Volume Loss). The test equipment used for the volume change (loss) measurement test conforms to JIS A 1439 5.11.1. The volume change (loss) measurement test is conducted according to the method conforming to JIS A 1439 5.11.2.

[0023] In this embodiment, various materials as exemplified above can be used as the sealant 12, but it is preferable that it be a non-bleeding type. When a non-bleeding type sealant is used, 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 sealing material 12 having a predetermined volume loss (%) is used according to the filling height t. The predetermined volume loss (%) corresponding to the filling height t is the rate of shrinkage that occurs during drying and hardening, and is a value determined in advance by calculation. Specifically, a sealing material 12 is used that is filled into the recess 10 at a predetermined filling height t and has a volume loss (%) such that the amount of recess s on the surface (front side) after drying and hardening is 0.2 mm or less.

[0025] As shown in Figure 5, when the sealant 12 is cured for a predetermined period, it loses volume and shrinks. When the sealant 12 loses volume, the shrinkage occurs while avoiding the area where it is bonded to the wall panel 1. The insulating material 11, which was placed before filling with the sealant 12, is made of a material that does not bond to the sealant 12, and a non-bonding area is formed between the sealant 12 and the insulating material 11. Therefore, shrinkage occurs on both the front surface of the sealant 12 (the front side of the wall panel 1) and the back surface (the side with the insulating material 11). In other words, a portion of the loss of the sealant 12 (for example, about half) is absorbed in the non-bonding area, so the overall shrinkage on the front side of the wall panel 1 can be reduced by about half compared to the case where 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 is a rectangular shape with one side open when viewed in cross-section, and the box-shaped joint has a width (joint width) w of 7 mm and a depth d of 10 mm, with a filling height t of 8 mm. In this case, the filling cross-sectional area of ​​the sealant 12 is 7mm × 8mm = 56mm 2Therefore, if the volume loss of the sealant 12 is 10%, the lost cross-sectional area (volume loss cross-sectional area) is 56 mm². 2 ×10% = 5.6mm 2 Therefore, if the volume loss is received both above and below the sealing material 12, the volume loss cross-sectional area on the upper (surface) side will be half, or 2.8 mm². 2 Therefore, the amount of recess s on the upper side is 2.8 mm. 2 / 7mm = 0.40mm.

[0027] Table 1 shows the calculation results for the amount of indentation s on the surface side after drying and hardening, for cases where the volume loss (%) of the sealant 12 is between 0% and 15%. The volume loss (%) at which the amount of indentation 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 described above, the amount of recess s on the surface of the sealant 12 after drying and hardening was determined for recesses 10 with a width (joint width) w of 3 mm to 20 mm, when the filling height t of the sealant 12 was set to 5 mm to 20 mm. Next, we summarized the relationship between the filling height t of the sealant 12 and the volume loss (%) such that the surface depression s after drying and hardening is 0.2 mm or less. 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 with a volume loss (%) of 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 with a volume loss (%) of 6% or less; and 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 with a volume loss (%) of 5% or less. When the filling height t of the sealing material 12 is 8 to 10 mm (more than 8.5 mm and 10.5 mm or less), it is preferable to use a sealing material 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 13.5 mm or less), it is preferable to use a sealing material with a volume loss (%) of 3% or less. When the filling height t of the sealing material 12 is 13 to 20 mm (more than 13.5 mm and 20.5 mm or less), it is preferable to use a sealing material with a volume loss (%) of 2% or less. The filling height t and volume loss (%) were specified with a range of ±0.5 mm based on the above calculation results.

[0032] For example, if the filling height t is 8 mm, use "Sealant 12 with a volume loss (%) of 5% or less" from the table above. While sealants with a volume loss (%) of 4% or 3% are also acceptable, generally, the lower the volume loss (%), the more specialized the sealant becomes, making it harder to obtain. Furthermore, the price tends to be higher. According to the method of this embodiment, it becomes possible to use a general sealant in a concentration of, for example, 8% to 5%, without using a special sealant, thereby reducing material costs.

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

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

[0035] In this embodiment, the relationship between the filling height t of the sealant 12 and the volume loss (%) can be applied to recesses 10 where the minimum 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 viewpoint of more accurate construction and practical use, it is preferable that the joint width w is 3 mm to 20 mm.

[0036] Furthermore, the recess 10 is applicable not only to recesses with a rectangular cross-section where the width (joint width) is constant in the depth direction, but also to recesses with a roughly inverted trapezoidal cross-section where the joint width differs in the depth direction, for example, when the width on the opening side is greater than the width on the bottom side, or to joints consisting of recesses with steps.

[0037] (3) Press the sealant 12 filled in the recess 10 down on the surface of the wall panel 1 with a spatula. After filling the recess 10 with sealant 12, the surface of the sealant 12 is smoothed with a spatula so that it is flat against the surface of the wall panel 1.

[0038] It is preferable to press down the sealant 12 with a spatula so that the surface of the sealant 12 is within the range of -0.3 mm to +0.3 mm relative to the surface of the wall panel 1. In this specification, a positive (+) signifies that the surface of the sealing material 12 is convex relative to the surface of the wall panel 1, and a negative (-) signifies that it is concave. Regarding the use of a spatula to press down the material, in addition to using a general 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] Afterward, the sealant 12 is allowed to cure for a predetermined period. The sealant 12 loses volume (shrinks) as it dries and hardens. Generally, a volume loss of about 5-10% occurs over time, and the predetermined period mentioned above is the period during which this shrinkage subsides. Specifically, a predetermined period of 3 days or more is preferable. A period exceeding 20 days is preferable because the shrinkage (volume loss) is almost eliminated, but considering that this may extend the construction period, 14 days or less is preferable, and more preferably 5-10 days.

[0040] Immediately after pressing down the sealant 12, the finished position of the sealant 12 is in the range of -0.3mm to +0.3mm from the panel surface. However, in reality, due to volume loss as the sealant 12 dries and hardens, a further depression on the surface occurs from this position.

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

[0042] Because the surface of the sealant 12 is set to a range of -0.3 mm to +0.3 mm relative to the surface of the wall panel 1 by the spatula pressing, even if it sinks down by another 0.2 mm due to the drying and hardening of the sealant 12, the final position of the surface of the sealant 12 will be within a range of -0.5 (=-0.3-0.2) mm to +0.1 (=+0.3-0.2) mm from the panel surface.

[0043] (4) After the sealant 12 has dried and hardened, apply the finishing material 13 to the surface of the wall panel 1. As shown in Figure 6, the finishing material 13 is applied to the surface of the wall panel 1, including the surface of the sealant 12, and the surface is cured for 24 hours or more, for example, when the ambient temperature is 23°C, to complete the finish.

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

[0045] The finishing material 13 is preferably composed of a primer + main material + top coat, a primer + main material, or main material only. Furthermore, any known shape can be used for the finished surface, such as orange peel texture, ripple texture, uneven texture, sand wall texture, earthen wall texture, plaster texture, stucco texture, Kyoto wall texture, fiber wall texture, scraped texture, or flat texture. Even with finishes that are close to flat, such as sand wall texture, plaster texture, Kyoto wall texture, or flat texture, the joint method of the present invention makes it possible to finish the surface in a way that makes the joints 1a almost invisible. The thickness of the finishing material 13 after drying is preferably 0.5 mm or more and 20 mm or less, and more preferably 1 mm or more and 10 mm or less.

[0046] By ensuring that the surface of the sealant 12 after drying and hardening is within the range of -0.5 mm to +0.1 mm relative to the surface of the wall panel 1, the thickness of the primer layer after drying can be set to 0.5 mm or more, thereby filling any depressions on the surface of the sealant 12 with the primer and creating a flat surface.

[0047] Since a flat surface can be achieved after the undercoat, even if intermediate and top coats are applied in layers, the final finish can create the desired flat design, such as a large wall-like appearance. By painting the entire surface of the wall panel 1 with the finishing material 13, the joints 1a can be made less noticeable, thus enabling the realization of desired planar designs, such as a large wall style.

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

[0049] We will explain using an example where a sealant 12 has a volume loss (%) of 0.3 mm after drying and hardening, and the finished position of the sealant 12 immediately after pressing is ±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 the drying and hardening of the sealant 12, is in the range of -0.5 (= -0.2 - 0.3) mm to -0.1 (= +0.2 - 0.3) mm, i.e., the sum of the finished position (±0.2 mm) and the recess (0.3 mm). By setting the combination of the finished position (achieved by trowel pressing), the recess of the sealant 12, and the film thickness of the finishing material 13 after drying so that this value is less than or equal to the film thickness of the finishing material 13 after drying, the recess on the surface of the sealant 12 can be filled with the primer to create a flat surface.

[0051] For example, by ensuring that the surface of the sealant 12 after drying and hardening is within the range of -0.5 mm to -0.1 mm relative to the surface of the wall panel 1, the thickness of the primer layer after drying can be set to 0.5 mm or more, thereby filling in any depressions on the surface of the sealant 12 with the primer and creating a flat surface.

[0052] By performing each of the above steps, the wall panel structure 5 (wall surface structure) is formed. As shown in Figures 1 and 6, the wall panel structure 5 has recesses 10 provided along the joints 1a of the wall panels 1. An insulating material 11 is placed on the bottom surface 10a of the recesses 10, and a sealing material 12 is placed on top of the insulating material 11. The entire surface of the wall panel 1, including the filled surface of the sealing material 12, is covered with a finishing material 13.

[0053] In this construction method, 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 the sealant 12 used has a predetermined volume loss (%) depending on the filling height t. This method suppresses the occurrence of depressions in the painted surface caused by the volume loss of the sealant 12, and therefore, a smooth painted surface in which the joint 1a is less noticeable can be achieved.

[0054] Furthermore, 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-adherent area is formed on the back side of the joint of the recess 10. Consequently, at least a portion of the shrinkage that occurs in the sealant 12 is absorbed in the non-adherent area on the back side of the joint, reducing the shrinkage that occurs on the side to which the finishing material 13 is applied. As a result, it is effective in making the joint 1a less noticeable after painting with the finishing material 13.

[0055] Furthermore, even if the sealant 12 shrinks due to aging, some of the shrinkage is absorbed in the non-adhesive areas, which are in a free state (not restrained by the insulating material 11, etc.). Therefore, a smooth painted surface can be achieved in which the joint 1a is less noticeable over a long period of time.

[0056] As described above, the jointing method according to this embodiment does not require special materials or construction methods compared to conventional joint treatment or 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 comprehensively resolves the problems of conventional technologies and is highly advantageous in that it can form even large wall-like planar designs over a long period of time.

[0057] While embodiments of the present invention have been described above, the present invention is not limited thereto and can be modified as appropriate without departing from the spirit of the invention.

[0058] For example, in the embodiment described above, primer treatment is applied as appropriate, which is preferable because it ensures stabilization of the adhesive surface and further suppresses deterioration of the insulating material and sealing material. Primer treatment may be omitted as appropriate.

[0059] Furthermore, the joint construction method of the present invention described above can also be applied to assembly methods for wall structures (walls) having multiple wall panels, and to construction methods for buildings equipped with walls having multiple wall panels.

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

[0061] Furthermore, while wall panels are typically configured in either a horizontal or vertical orientation, in either configuration, various designs can be created according to preference, including a "large wall-like design" that conceals all joints, a design pattern that conceals horizontal joints and only shows vertical joints, a design pattern that conceals vertical joints and only shows horizontal joints, and a design pattern that conceals some vertical and horizontal joints to reveal a large grid. When creating such patterns, a standard sealant joint retainer (2-3 mm retainer) can be used for the areas where joints are to be visible, and the joint construction method of the present invention can be applied to areas where joints should not be conspicuous, thereby constructing exterior wall panels that feature a design application pattern of a large wall grid. The aforementioned design patterns can be applied to the walls of private residences, commercial buildings, and office buildings, and can accommodate the preferences of designers and clients who want to emphasize only horizontal joints or only vertical joints, or who want to conceal all joints to create a large wall design. [Industrial applicability]

[0062] By using the construction method according to the present invention, joints can be made less noticeable without requiring special materials or construction methods, and without extending the construction period. This method can be widely used as a joint filling method for wall panels. [Explanation of Symbols]

[0063] 1: Wall panel 1a: Joint 1b: Notch 1c: Butt joint 2: Breathable waterproof sheet 3: Furring strips 4: Screw 5: Wall panel structure 10: Recess 10a: Base 10b: Side 11: Insulating material 12: Sealant 13: Finishing materials d: depth s: Amount of indentation t: Filling height w:Minimum width

Claims

1. The following steps: (1) A step of forming a non-adhesive area on the bottom surface of a recess provided along the joint formed by the butting of wall panels together; (2) Filling the recess in which the non-adhesive area is formed with a sealing material; (3) The step of pressing down the surface of the sealing material filled in the recess; and (4) A step of applying a finishing material to the surface of the sealing material and the wall panel after drying and hardening; It has, The minimum width of the recess is 3 mm or more, and the filling height of the sealing material into the recess from the non-adhesive area is 4.5 mm or more. The joint construction method is characterized in that, in step (2) above, a sealant is used that has a volume loss (%) such that the amount of surface depression of the sealant filled in the recess after drying and hardening is 0.2 mm or less.

2. The joint construction method according to claim 1, wherein in step (2), a sealing material having a predetermined volume loss (%) is used according to the filling height.

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

4. The joint construction method according to claim 1, wherein in step (3), the sum of the finished position of the surface of the sealant pressed with a spatula from the surface of the wall panel and the amount of surface recession of the sealant filled in the recess after drying and hardening is less than or equal to 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. In step (2) above, if the filling height is 4.5 mm or more and 5.5 mm or less, a sealant with a volume loss (%) due to drying and hardening of 8% or less is used, the joint construction method according to any one of claims 1 to 5.

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

8. In step (2) above, if the filling height is greater than 6.5 mm and 8.5 mm or less, a sealant with a volume loss (%) due to drying and hardening of 5% or less is used, the joint construction method according to any one of claims 1 to 5.

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

10. In step (2) above, if the filling height is greater than 10.5 mm and less than or equal to 13.5 mm, a sealant with a volume loss (%) due to drying and hardening of 3% or less is used, as described in any one of claims 1 to 5.

11. In step (2) above, if the filling height is greater than 13.5 mm and less than or equal to 20.5 mm, a sealant with a volume loss (%) due to drying and hardening of 2% or less is used, as described in any one of claims 1 to 5.

12. A method for manufacturing a wall structure, comprising the joint construction method described in any one of claims 1 to 11.

13. A non-adhesive area formed on the bottom surface of a recess provided along the joint where wall panels meet, A sealing material filled into the recess where the non-adhesive region is formed, The sealing material and the finishing material provided on the surface of the wall panel are included, The minimum width of the recess is 3 mm or more, and the filling height of the sealing material into the recess from the non-adhesive area is 4.5 mm or more. The aforementioned sealant is a wall structure in which the amount of surface depression during drying and curing is 0.2 mm or less, and the volume loss (%) is 0.2 mm or less.

14. The wall structure according to claim 13, wherein the sealing material is a sealing material having a predetermined value corresponding to the filling height in terms of volume loss (%) during drying and curing.

15. The wall structure according to claim 13 or 14, wherein the sum of the finished position of the surface of the sealing material from the surface of the wall panel and the amount of recess of the surface of the sealing material filled in the recess is less than or equal to the thickness of the finishing material.

16. The wall structure according to any one of claims 13 to 15, wherein the surface of the sealing material is -0.5 mm to -0.1 mm relative to the surface of the wall panel.

17. The wall structure according to any one of claims 13 to 16, wherein the film thickness of the finishing material is 0.5 mm or more.

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