JP2746176B2 - Joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for joint structures such as exterior panels, sashes, cubicles, and copings.
The present invention relates to a joint structure which has excellent seal reliability and durability and can be constructed by a simple construction method.

[0002]

2. Description of the Related Art Joints such as exterior panels are subjected to a sealing treatment to prevent infiltration of rainwater. First, in describing such a conventional joint structure, a general structure of the joint will be described. The outline of various joint structures proposed so far will be described. First, FIG. 20 is a sectional view showing a basic structure of a conventional joint portion.
(A) is a joint in which a sealing material serving as an elastic member after curing is filled in the joint, and (B) is a fixed seal member attached to the joint in place of filling the sealing material. In the figure, 20 and 20 are exterior panels, and a gap is formed between the panels as a joint portion 21. This joint is filled with the sealing material 22 in (a). Usually, at this time, the joint depth of the sealing material is specified,
In order to avoid three-sided adhesion, a backup material 23 made of polyolefin which is difficult to adhere is attached in advance. On the other hand, in (b), the joint portion 21 is sealed by inserting the fixed-form sealing member 24. This method is designed to maintain an adequate compressive stress even at the time of expansion of joint space and to maintain the sealing performance.
Because it is of the type that is inserted or sandwiched in a pre-compressed form, a force is always applied to the inserted fixed seal member, a reduction in rebound resilience and watertightness due to permanent strain occurs, and a fixed seal member due to expansion and contraction of joints However, it has a drawback that it comes out of the panel or falls off.
Therefore, in the case of the conventional joint structure having only the fixed seal member, it is practically difficult to maintain the airtight and watertight functions while following the expansion and contraction of the joint, and to use the joint with the secondary seal or the principle of the open joint. Various improvements have already been disclosed, either as a combination or as described below.

[0003] Japanese Utility Model Laid-Open No. 3-76901 and Japanese Utility Model Laid-Open No. 3-12
No. 9605 discloses a method in which an adhesive is applied in an auxiliary manner in order to enhance the adhesiveness of the fixed seal member, or the adhesive component is filled in a bag-shaped fixed seal member. Then, Japanese Patent Application Laid-Open No. 62-72844 discloses a method in which a fixed sealing member is first attached to a backup material, and an uncured fluid sealing material is poured into a gap and then cured.

[0004] Japanese Patent Application Laid-Open No. 4-32643 discloses an epoxy adhesive applied to a surface constituting a joint, inserts a fixed sealing member having a hollow structure, and blows air into the hollow portion. The epoxy adhesive is completely brought into close contact by being fed. JP-A-2-1
No. 15434 is a fixed-form sealing member which is elastically deformable substantially equal to the joint width, has a recess formed on the back surface, and is filled with a sealing material which does not flow out in a natural state where no external force is applied to the recess. In this case, an overflow channel is provided which can be elastically deformed by an external force after being inserted into the joint and overflow the sealing material from the recess. Japanese Patent Application Laid-Open No. Sho 62-153441 discloses a method of sealing a siding material with joints by combining an irregular-shaped seal material and a fixed-form seal material.

[0005]

The most important factor in discussing the durability of the joint of the amorphous elastic sealing material is the stress of the amorphous elastic sealing material at the joint. That is, in the conventional joint structure, stress concentrates on an adhesive interface between the irregular elastic sealing material and the panel due to a change in joint spacing, and as a result, cracks or peeling occur at the stress concentration portion of the irregular elastic sealing material, resulting in panel cracking. Therefore, the area of adhesion to the joint decreases, and the reliability of the seal at the joint decreases. The cause of this is that, for example, filling the irregular elastic sealing material in winter when the joint interval is the widest reduces the joint interval with the rise in temperature, and conversely, filling the irregular elastic sealing material in the summer when the joint interval becomes the narrowest reduces the temperature. It is conceivable that the joint spacing increases with the descent, and as a result of the compressive or tensile force applied to the amorphous elastic sealing material, a large strain remains at a location where the stress is concentrated and becomes a permanent strain. Conventionally, in the joint design of a normal building structure, the depth (D) of the joint filled with the irregular elastic sealing material with respect to the joint width (W) is changed to the irregular elastic sealing material due to the fluctuation of the joint interval. In order to suppress cracking of the amorphous elastic sealing material or separation at the bonding interface, which is caused by the compressive stress and the tensile stress, D /
It is restricted to W = 1/1 to 1/3. For example, D / W
Is greater than or equal to 1/1, that is, when the joint depth (D) for filling the amorphous elastic sealing material is larger than the joint interval width (W), the irregular elasticity is usually increased when the joint interval expands and contracts. The compressive stress applied to the sealing material is remarkably increased, and as a result, the stress is concentrated on the edge of the adhesive interface between the amorphous elastic sealing material and the joint wall surface, and the problem of peeling is likely to occur. In addition, when the joint interval expands and fluctuates, D /
If W = 1/3 or less, that is, if the width (W) of the joint interval is larger than the joint depth (D) at which the irregular elastic sealing material is filled, the tensile stress of the irregular elastic sealing material decreases and the elongation increases. In such a state, the deterioration of the weather resistance of the amorphous elastic sealing material is promoted, cracks may occur, and there is a problem that the reliability of the seal tends to be lowered. As described above, the irregular-shaped elastic sealing material has a destructive strength of the joint member itself and an adhesive strength between the irregular-shaped elastic sealing material and the joint member when the expansion and contraction of the joint space occurs (a primer / joint member when a primer is used). (Including adhesive strength between the primer and the amorphous elastic sealing material) and the design of an amorphous elastic sealing material that has a lower stress than that of the sealing material, and low surface adhesion due to the exposed surface (dust adhesion) Contradictory design philosophy is required, which requires high-density, high-strength materials that have excellent design properties, cracks, weather resistance, and durability (toughness). The idea of selecting the right person in the right place, that is, selecting the type of the amorphous elastic sealing material depending on the use site, is permeated.

Accordingly, the joint structure can mainly absorb fluctuations in joint spacing caused by temperature changes, interlayer displacement due to earthquakes, bending of members due to wind, deformation due to changes in moisture content of members, and durability including long-term adhesion. Is an essential condition, and is not limited to the joint shape or to the irregularly shaped elastic sealing material to be used, and it is desired to use a material that does not require much time and effort during construction. However, among the conventional joint structures described above, those disclosed in Japanese Utility Model Laid-Open Publication No. 3-76901 and Japanese Utility Model Laid-Open Publication No. 3-129605 improve the sealing performance due to the curing of the adhesive, but the structure of the fixed seal member becomes complicated. Leakage of the adhesive from the bag-shaped part is also a concern. Next, in Japanese Unexamined Patent Publication No. 62-72844, although the sealing performance is improved by using a fixed sealing member and a fluid sealing material in combination, it is difficult to completely pour the sealing material into complicated voids. In addition, since the state of pouring cannot be confirmed, there is a problem that the reliability of the seal is lacking, such as the occurrence of an insufficiently filled portion.
However, on the other hand, if the filling is performed reliably, the sealing material will be a three-sided bond where both panels and the cap are bonded at the same time, and the concentration of stress will significantly deteriorate the joint function such as cracking. is there. Also, JP-A-4-312
Although the sealing performance of No. 643 is also improved, there is a problem that the shape of the fixed-shaped sealing member becomes complicated and the work is troublesome. In the case of Japanese Patent Application Laid-Open No. 2-115434, there is a danger that the sealing material may erroneously overflow during storage, and there is a problem that great care must be taken in handling. Lastly, Japanese Unexamined Patent Application Publication No. 62-153441 describes a method for improving waterproof sealing performance and workability of joints.
The above-mentioned conventional problem concerning the stress at the bonding interface of the irregular-shaped sealing material due to the fluctuation of the joint spacing cannot be solved.

As described above, in the conventional joint structure, the seal structure caused by the interrelation between the joint interval (W) and the joint depth (D) is determined from the joint structure, the situation of the expansion and contraction of the joint interval, and the performance of the sealing material. There is a drawback that the improvement of reliability and durability and the workability of sealing work cannot be achieved at the same time.

As described above, the joint structure using the conventional irregular elastic sealing material and the regular sealing material is a technical idea of bonding and fixing the regular sealing material with an adhesive or the irregular elastic sealing material. The fixed-size sealing material is pushed into a deformed state, and the distortion is absorbed following the expansion and contraction fluctuation of the joint interval, or the expansion and contraction fluctuation of the joint interval is absorbed by the fins of the legs of the standard sealing material. For this reason, the fixed seal material itself does not easily absorb the fluctuation of the joint interval. The irregular-shaped sealing material (adhesive) is provided for the purpose of holding the regular-shaped sealing member to the joint-forming panel for preventing the regular-shaped sealing member from rising or falling off, and is only subordinate.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. In order to reduce the stress of an irregular elastic sealing material, a regular sealing member and an irregular elastic sealing are required. A joint structure having good workability of sealing work and high seal reliability is realized by combining with materials. The present invention that has solved the above-mentioned problems is a joint structure in which an irregular-shaped elastic sealing material and a joint space fluctuation absorbing member are used in combination, and the irregular-shaped elastic sealing material is formed with a joint depth (D) determined by the main surface of the backup material. Joint width (W), the distance between the lower surface of the joint interval fluctuation absorbing member and the main surface of the backup material, or the length in the joint depth direction of the portion composed only of the upper surface of the joint interval fluctuation absorbing member and the amorphous elastic sealing material The relation with (d) is D ≧ 10m
When m and 10 mm ≦ W ≦ 20 mm, the formula: 0 ≦ d <W / 2 + 5 mm (1) or D ≧ W / 4 + 5 mm and 20 mm <W ≦
In the case of 40 mm, formula: 0 ≦ d <W / 4 + 10 mm (2) Filled in the range of (2), and tensile and compressive stress generated at the bonding interface between the irregular elastic sealing material and the joint wall surface with the change of joint spacing Is a joint structure having the same cross-sectional shape and set to be lower than the tensile and compressive stress generated at the bonding interface between the irregular elastic sealing material and the joint wall surface in the joint structure filled only with the irregular elastic sealing material.

[0010] Here, the joint interval fluctuation absorbing member may be embedded from the bottom of the joint determined by the backup material to an appropriate position in the depth direction of the amorphous elastic sealing material.

Further, a joint spacing fluctuation absorbing member made of an elastic expanding / contracting structure or an elastic expanding material may be provided so as to project from the backup material toward the joint opening side. The irregular-shaped elastic sealing material may be buried from an opening side of the joint to an appropriate position in a depth direction. Further, at this time, a buried-side tip of the joint interval fluctuation absorbing member embedded from the opening side of the joint to an appropriate place in the depth direction of the amorphous elastic sealing material, and a joint interval fluctuation absorbing member protruding from the backup material. May be in contact.

In addition, in the above configuration, the joint interval fluctuation absorbing member is an elastic expansion / contraction structure or elastic expansion / contraction fluctuation absorbing member, or the joint interval fluctuation absorbing member is a hollow elastic expansion / contraction structure or elastic expansion / contraction material. The joint interval fluctuation absorbing member may be configured to be an elastic expansion / contraction structure made of a foam or an elastic expansion / contraction material.

Here, the main surface of the backup material refers to the main surface of the backup material that forms the bottom of the joint having a substantially rectangular cross section. Further, as a sealing method of the joint structure of the present invention, after filling an appropriate amount of the amorphous elastic sealing material into the joint portion, the joint spacing fluctuation absorbing member is inserted, and the joint of the uncured irregular elastic sealing material is utilized by utilizing the adhesiveness. A method of fixing the gap fluctuation absorbing member and filling it with an irregular elastic sealing material, and fixing or fixing the joint gap fluctuation absorbing member to the backup material, and absorbing the joint gap fluctuation to the joint part at the same time as inserting the backup material A method of loading a member and then filling it with an irregular elastic sealing material, a method of filling the irregular elastic sealing material first, and then embedding part or all of the joint gap fluctuation absorbing member, absorbing joint gap fluctuation A method in which the members are pre-loaded into the joints as a surface finishing material, and then filled with an amorphous elastic sealing material from the back side of the joint panel to finish. The combination of ~, various methods like are conceivable, but not particularly limited to the above method.

[0014]

According to the joint structure of the present invention, the above problem can be solved by the following operation. First, a joint structure in which an irregular elastic sealing material and a joint space fluctuation absorbing member are used in combination, wherein the irregular elastic sealing material is jointed with a joint depth (D), joint width (W), and joint width determined by the main surface of the backup material.
The relationship between the distance between the lower surface of the joint interval fluctuation absorbing member and the main surface of the backup material or the length d in the joint depth direction of the portion formed only by the upper surface of the joint interval fluctuation absorbing member and the amorphous elastic sealing material, D ≧ 10mm and 10m
When m ≦ W ≦ 20 mm, 0 ≦ d <W / 2 + 5 mm, or D ≧ W / 4 + 5 mm and 20 mm <W ≦ 40 m
In the case of m, filling is performed in a range of 0 ≦ d <W / 4 + 10 mm, and when the joint interval fluctuation absorbing member is an elastic expanding / contracting structure or an elastic expanding / contracting material, an irregular shape with respect to expansion / contraction fluctuation of the joint interval. Of the joint spacing variation absorbing members used in combination with the elastic sealing material at a specific depth, the joint spacing variation absorbing member mainly acts, so that the expansion / contraction variation acting on the irregular elastic sealing material is reduced, resulting in irregular shapes. It acts to suppress the concentration of stress on the elastic sealing material more than the tensile and compressive stress generated at the bonding interface between the irregular elastic sealing material and the joint wall surface in the joint structure filled only with the irregular elastic sealing material.

That is, when the joint interval fluctuates, the joint interval fluctuation absorbing member expands and contracts and absorbs the joint interval fluctuation without expanding or contracting the irregular elastic sealing material. Therefore, the joint interval fluctuation absorbing member alleviates stress and stress concentration at the adhesive interface of the irregular-shaped elastic sealing material, particularly at the stress concentration portion. The joint interval fluctuation absorbing member fills only the irregular elastic sealing material with the same cross-sectional shape and the tensile and compressive stress generated at the bonding interface between the irregular elastic sealing material and the joint wall surface with the joint interval fluctuation. When it is lower than the tensile and compressive stress generated at the bonding interface between the irregular elastic sealing material and the joint wall surface in the joint structure, the joint interval fluctuation absorbing member expands and contracts to absorb the joint interval fluctuation, that is, in the stress concentration portion. In the joint design, the relationship between the joint width (W) and the joint depth (D) is determined by D / W = 1/1 to about 1 as in the related art.
/ 3 (Conventionally, if the joint is shallow, there is a risk of breakage due to peeling or deterioration from the surface due to insufficient bonding area,
Conversely, if it is too deep, depending on the type of the amorphous elastic sealing material, there is a fear of damage due to curing inhibition or delay in curing, and from the viewpoint of preventing stress concentration on the bonded part due to fluctuation in joint spacing, it is within such a range. The joint depth is determined by the main surface of the backup material, the joint interval (W), the distance between the lower surface of the joint interval fluctuation absorbing member and the main surface of the backup material. The depth of the gap filled with the amorphous elastic sealing material, or the relationship between the upper surface of the joint spacing fluctuation absorbing member and the length d in the joint depth direction of the portion constituted only by the amorphous elastic sealing material is D ≧ 10 mm. When 10 mm ≦ W ≦ 20 mm, 0 ≦ d <W / 2 + 5 mm or D ≧ W / 4 +
When 5 mm and 20 mm <W ≦ 40 mm, 0 ≦ d <W /
The joint depth can be increased in the range of 4 + 10 mm, and even when this depth is increased, the effect of alleviating the stress concentration at the adhesive interface of the irregular elastic sealing material due to the fluctuation of the joint spacing can be obtained. . The position in the depth direction of the irregular elastic sealing material where the joint interval fluctuation absorbing member is buried is determined by the tensile and compressive stress generated due to the joint interval fluctuation in the irregular elastic sealing material for a long period of time. In order not to exceed the adhesive strength or the strength, it is appropriately set in consideration of the relationship between the expansion / contraction ratio of the joint interval and the design strength of the amorphous elastic sealing material assuming a long term, and furthermore, the safety factor. In the above equation, when d = 0, for example, the joint interval fluctuation absorbing member has reached from the surface layer of the joint to the backup material, and the joint depth D at this time is the minimum defined in each of the above equations. If it is more than the joint depth, it indicates that there is no limit in the workable range. That is, the bonding area between the irregular elastic sealing material and the joint wall surface (panel) is greatly increased, and the effect of significantly improving the bonding reliability is obtained. Here, in the above equation, the joint width W is 10 mm or more.
The reason for setting it within the range of 40 mm is “JASS8
This is a case in which the conventional value of the general joints in the “Architectural Construction Standard Specifications of the Architectural Institute of Japan, Waterproofing Work / Commentary” is adopted, and from the idea of the present invention, the conventional value of the joint width W is 10 mm, which has been regarded as the appropriate value. The joint design is not limited to 40 mm at all. For example, even if it is less than 10 mm or exceeds 40 mm, it is possible to design a joint that can withstand long-term use.
In addition, the width of the joint interval fluctuation absorbing member determined by the cross-sectional shape of the joint is appropriately set according to, for example, the ratio of the joint expansion / contraction fluctuation.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a sectional view showing a first embodiment of the present invention. In the illustrated example, a backup material 3 is inserted at a fixed position of a joint 2 between two exterior panels 1 and 1, and an appropriate amount of an amorphous elastic sealing material 4 is filled thereon, and a substantially rectangular shape in a sectional view is provided. The lower part of the joint spacing variation absorbing member 5 is brought into contact with the main surface of the backup material 3, and the upper surface of the joint spacing variation absorbing member 5 and the irregular shaped elastic sealing material 4.
The irregularly shaped elastic sealing material 4 is filled so that the length d in the joint depth direction of the portion constituted only by the joint is approximately one third of the depth of the entire joint. The tensile and compressive stresses generated at the bonding interface between the joint 4 and the joint wall surface are measured by using the irregular elastic sealing material and the joint wall surface (exterior panel 1) in the joint structure having the same cross-sectional shape and filled only with the irregular elastic sealing material. The joint structure is set to be lower than the tensile and compressive stress generated at the bonding interface. In this example, a foam is used as the joint interval fluctuation absorbing member 5. In this case, d is the joint depth between the lower surface of the joint interval fluctuation absorbing member 5 and the main surface of the backup material 3, and 0 ≦ d <W / 2 + 5 according to the joint width W.
mm or 0 ≦ d <W / 4 + 10 mm.

FIG. 2 is a sectional view of a second embodiment of the present invention. In the example shown in the figure, a backup material 3 is inserted at a fixed position of a joint 2 between two exterior panels 1 and 1 as in FIG. 1, and an appropriate amount of an amorphous elastic sealing material 4 is filled thereon. The joint interval fluctuation absorbing member 5 having a substantially rectangular outer shape in cross section is placed at a proper position in the depth direction of the irregular elastic sealing material 4 from the bottom of the joint 2 determined by the backup material 3. Buried up to about / 3. However, in the present embodiment, unlike the first embodiment, the joint interval fluctuation absorbing member 5 has a substantially rectangular outer shape in cross section and has a hollow portion 5a instead of a solid shape. It may be circular or elliptical, and the same foam as in the first embodiment may be used as the material. That is, d in the case of this example is equivalent to the length in the joint depth direction of a portion constituted only by the upper surface of the joint interval fluctuation absorbing member 5 and the amorphous elastic sealing material 4, and d is about 1 / 3
It is filled with an irregularly shaped elastic sealing material 4 to a certain extent. Note that d is appropriately determined according to the joint width (W).

FIG. 3 is a sectional view showing a third embodiment of the present invention. In the example shown in the figure, a backup material 3 is inserted at a fixed position of a joint 2 between two exterior panels 1 and 1 as in FIG. 1, and an appropriate amount of an amorphous elastic sealing material 4 is filled thereon. The joint spacing fluctuation absorbing member 5 having a substantially rectangular outer shape in cross section is extended from the main surface of the backup material 3 to the surface of the irregular elastic sealing material 4, that is, the joint spacing fluctuation absorbing member 5 is provided outside the joint 2. And d = 0. In the present embodiment, as in the first embodiment, a foam is used as the joint interval fluctuation absorbing member 5.

FIG. 4 is a sectional view showing a fourth embodiment of the present invention. In the example shown in FIG. 1, the depth of the joint of the joint formed between the two exterior panels 1 and 1 only composed of the upper surface of the joint spacing fluctuation absorbing member 5 and the irregular elastic sealing material 4 at the joint 2 between them. The length d in the direction is set to 0 as in the third embodiment. Further, the joint interval fluctuation absorbing member 5 has a substantially rectangular outer shape in cross section, and unlike the third embodiment, is not a solid but a hollow portion 5a.
Is used. However, the cross-sectional shape may be circular or elliptical, and the same foam as in the first embodiment may be used as the material.

Note that the first to fourth elements shown in FIGS.
In the joint structure of the embodiment, a double-sided tape is stuck to one side of the joint interval fluctuation absorbing member 5 and the surface is adhered to the joint bottom (backup material 3), and then the irregular elastic sealing material 4 is applied. Good. In addition, the joint space fluctuation absorbing member 5 is bonded to the backup material 3 in advance, or the joint space fluctuation absorbing member 5 has an adhesive property to the irregular elastic sealing material 4 and the backup material 3 is not bonded. After the joint interval fluctuation absorbing member 5 and the backup material 3 are simultaneously pushed into the joint 2, the irregular elastic sealing material 4 is applied. You may.

FIG. 5 is a sectional view showing a fifth embodiment of the present invention. In the illustrated example, a backup material 3 is inserted into a fixed position of a joint 2 between two exterior panels 1 and 1 and an appropriate amount of an irregularly shaped elastic sealing material 4 is filled thereon. The lower surface of the joint interval fluctuation absorbing member 5 having the external shape of the shape and the main surface of the backup material 3 are brought into contact with each other, and the length d in the joint depth direction of the portion constituted only by the amorphous elastic sealing material 4 is set to 0. Things. The joint interval fluctuation absorbing member 5 has a substantially T-shaped cross-sectional outer shape having a hollow portion 5a as shown in the figure, and includes an umbrella portion 5b substantially equal to the joint interval.
The joint between the joints 2 is interposed, and the back side of the umbrella portion 5b and the surface of the amorphous elastic sealing material 4 are adhered to each other. Here, since the joint interval fluctuation absorbing member 5 has such a substantially T-shaped cross-sectional outer shape, the umbrella portion 5b literally functions as a parasol, so that the irregular sealing material is not irradiated with ultraviolet rays. Thus, the effect of preventing deterioration of the amorphous elastic sealing material can be obtained. In addition, it is possible to completely eliminate the problem of contamination due to dust adhesion, defects in finished appearance and bird damage. Therefore, a joint structure having excellent weather resistance and design properties can be obtained.

FIG. 6 is a sectional view showing a sixth embodiment of the present invention. In the illustrated example, a backup material 3 is provided at a fixed position of a joint 2 between two exterior panels 1 and 1.
And an appropriate amount of the amorphous elastic sealing material 4
To an appropriate position in the joint depth direction of a portion constituted only by the upper surface of the joint interval fluctuation absorbing member 5 having the hollow portion 5a and the irregular elastic sealing material 4, in the illustrated example, to about 1/3 of the total joint depth. It was filled over. However, in this embodiment, the joint interval fluctuation absorbing member 5 is replaced with the backup material 3.
This embodiment is different from the above-described first to fifth embodiments in that the present embodiment is integrally formed. In particular, when the backup material 3 on which the joint interval fluctuation absorbing member 5 is protruded is integrally formed by a method such as integral molding, the joint interval fluctuation absorbing (member) portion 5 is bonded to the irregular elastic sealing material 4. The backing material 3 is made of a material which is easy to adhere to by applying a surface treatment such as an easy-to-use material or a primer. Desirable conditions are such that an adhesive tape (such as a bond breaker) is not attached to the amorphous elastic sealing material 4. Further, in the structure of the present example, the tip of the joint gap fluctuation absorbing member 5 is extended to the surface position of the joint 2, that is, the upper surface of the joint gap fluctuation absorbing member 5 and the irregular elastic sealing material 4.
The length d in the joint depth direction of the portion constituted by only the joints 2 is 0, and the irregular elastic sealing material 4 is not used on the upper surface of the joint interval fluctuation absorbing member 5, and the joint 2 extends over the entire depth direction. May be buried.

FIG. 7 is a sectional view showing a seventh embodiment of the present invention. The example shown in the figure has a joint structure in which the fifth embodiment of FIG. 5 and the sixth embodiment of FIG. 6 are combined, and the irregular-shaped elastic sealing after inserting the backup material 3 having the joint interval fluctuation absorbing member 5c protruding therefrom. A joint 4 is inserted, and a joint interval fluctuation absorbing member 5 having a substantially T-shaped cross-sectional appearance similar to that shown in FIG. 5 is inserted. With such a structure, the above-described advantages of the present invention are obtained, and workability is also improved. Although the joint interval fluctuation absorbing member 5 is solid in this drawing, a hollow member can be used as in FIG. Further, by providing a projection at an appropriate position of the joint interval fluctuation absorbing member 5 and inserting or piercing the joint interval fluctuation absorbing member 5c on the backup material 3 side,
One consideration is to prevent the gap between the two joint interval fluctuation absorbing members 5, 5c from shifting.

FIG. 8 is a sectional view showing an eighth embodiment of the present invention. In the example shown in the figure, an inverted U-shaped concave portion 5e is provided at the tip of the leg 5d of the joint interval fluctuation absorbing member 5 made of a foam having a substantially T-shaped cross section as in FIG.
Are brought into contact with each other by fitting with the joint interval fluctuation absorbing member 5c projecting from the backup material 3. With this structure, the two joint space fluctuation absorbing members 5, 5c are fixed, and the workability can be improved.

FIG. 9 is a sectional view showing a ninth embodiment of the present invention. The example shown in the figure is a joint structure in which a joint spacing variation absorbing member 5 is embedded in an amorphous elastic sealing material 4, and the joint spacing variation absorbing member 5 is provided with an umbrella portion 5b.
And a leg portion 5d, the width of the umbrella portion 5b is substantially equal to or wider than the joint interval, and at least the leg portion 5d is made of an elastic expansion / contraction structure or an elastic expansion / contraction material. The leg 5d of the joint interval fluctuation absorbing member 5 is embedded in the fixed elastic sealing material 4, and the gap 2s is provided between the umbrella portion 5b and the irregular elastic sealing material 4 to form the bottom of the joint 2. A joint interval fluctuation absorbing member 5c made of an elastic expansion / contraction structure or an elastic expansion / contraction material protrudes from the material 3 toward the opening side of the joint 2 and has a substantially T-shape embedded in the irregular elastic sealing material 4. By bringing the tip of the leg portion 5d of the joint gap variation absorbing member 5 into contact with or approaching the joint gap variation absorbing member 5c protruding from the backup material 3, the joint gap varies. The tensile and compressive stress generated at the bonding interface between the fixed elastic sealing material 4 and the joint wall surface (exterior panel 1) is reduced by the irregular elastic sealing material in the joint structure having the same cross-sectional shape and filled only with the irregular elastic sealing material 4. 4 is a joint structure set to be lower than the tensile and compressive stress generated at the bonding interface between the joint wall surface (exterior panel 1). In this example, an inverted U-shaped concave portion 5e is provided at the tip of the leg portion 5d of the joint interval fluctuation absorbing member 5, and the two are brought into contact by fitting with the joint interval fluctuation absorbing member 5c protruding from the backup material 3. Let me. Further, as shown in FIG. 10, the two joint space fluctuation absorbing members 5, 5c may be simply brought into contact with each other without using a fitting structure. With such a structure, the irregular elastic sealing material 4 does not come into contact with the umbrella portion 5b of the joint interval fluctuation absorbing member 5, so that so-called three-sided contact can be prevented, so that further improvement in durability can be expected. The umbrella portion 5b is made of a synthetic resin such as polycarbonate, nylon, or FRP, a metal material such as stainless steel, aluminum, titanium, or various alloys or a stone, and is subjected to coloring, mosaic, plating, vapor deposition, and the like, to expose the surface. The design and weather resistance can be significantly improved. At this time, since the umbrella portion 5b is a rigid body, the width and position of the umbrella portion 5b may be considered so as not to hinder the expansion and contraction of the joint interval.

Then, in the joint shape in which the main surface 3a of the backup material 3 in FIGS.
The relationship between the joint depth D, the joint width W, and the length d (shown in the drawing) in the joint depth direction of the portion constituted only by the amorphous elastic sealing material is described in the section of the means for solving the problem. If the joints are set to satisfy the above-mentioned formulas (1) and (2), the joint space fluctuation absorbing members 5 and 5c are not buried, that is, compared with a structure in which the entire joint portion is filled only with the amorphous elastic sealing material 4. Thus, the tensile and compressive stress can be set lower.

As described above, the joint spacing fluctuation absorbing members 5, 5c may be made of a foam without distinction between hollow and solid.
As the material of 5c, a material having a lower modulus (meaning a tensile modulus and a compressive modulus) than the amorphous elastic sealing material 4 is more effective. Here, the embedding position of the joint interval fluctuation absorbing members 5 and 5c is shown in the above-described examples as being located at the center of the joint part. In addition, the sectional shape of the joint interval fluctuation absorbing members 5, 5c may be circular or elliptical, and is not limited to this example.

As a specific example of the material used for the irregular elastic sealing material 4 and the joint interval fluctuation absorbing members 5, 5c, for example, the irregular elastic sealing material 4 is a conventional J material.
Classification by main components defined in ISA5758, silicone-based, modified silicone-based, polysulfide-based, modified polysulfide-based, acrylic urethane-based, polyurethane-based, acrylic-based, SBR-based, butyl rubber-based
Other than the above, a fluorine-containing polymer not specified in JIS A5758, a hot-melt type elastic sealing material, and the like are used. As the fixed seal member 5, known vulcanized rubbers such as silicone-based, chloroprene-based, and EPDM-based, polyurethane, SIS, and modified Thermoplastic elastomers such as polyolefins and chlorsulfonated polyethylene, general-purpose plastics such as PVC, thermoplastics called engineering plastics such as polycarbonate and nylon, super engineering plastics such as polyimides, and metals such as stainless steel and aluminum, and FRP Composite materials such as can also be used. Further, the cap portion may be made by combining a member having excellent weather resistance such as silicone rubber, and the leg portion with chloroprene rubber which is easily adhered to the amorphous elastic sealing material. Examples of the backup material 3 include a foamed polyolefin-based material that is hardly adhered to the generally used amorphous elastic sealing material 4 and a non-flammable inorganic fiber material depending on the application.

Further, the joint interval fluctuation absorbing member 5 caused by ultraviolet rays
As a method for preventing the deterioration of the resin, it is also conceivable to disperse an ultraviolet absorbing material in the fixed sealing member. Examples of the ultraviolet absorber include phenol-based, benzotriazole-based, and hindered amine-based ones.

In the following, the tensile /
The stress reduction effect of the present invention will be described with reference to the results of the compression stress test. In the test, FIG.
Was prepared. Here, the shaded portion 26 is a joint, and the amorphous elastic sealing material 4 was cured and cured at 20 ° C. for 7 days at + 50 ° C. for 7 days after the joint was applied, and was subjected to a test. The test was performed at a tensile speed of 50 mm / min and a compression speed of 10 mm / min, using a tensile tester Strograph R-1 manufactured by Toyo Seiki Co., Ltd.

[Tensile test 1] As shown in FIG. 12 (a), the joint depth 26 was made constant by setting the joint depth D to 20 mm and changing the joint width W (that is, the joint interval variation absorbing member 5 was used). The length d in the joint depth direction of the portion constituted only by the lower surface and the amorphous elastic sealing material 4 is 20 mm.
(= D), as shown in FIG. 12 (b), the joint interval fluctuation absorbing member 5 adjusted to have a joint width direction length w = 5 mm.
The space between the lower surface of the backing material 3 and the main surface of the backup material 3 is filled with the amorphous elastic sealing material 4 to a length d = 1/2 D in the depth direction of the joint of the portion constituted only by the amorphous elastic sealing material 4. Then, as shown in FIG. 12C, the joint gap fluctuation absorbing member 5 is buried until the lower surface of the joint gap fluctuation absorbing member 5 adjusted to have the length w = 5 mm in the joint width direction comes into contact with the main surface of the backup material. (Ie, d = 0 mm
Joint width W = 10,2
The 50% tensile stress (kgf / cm ² ) when changing to 0, 30, and 40 mm was evaluated. The result is shown in FIG. From the above results, when the joint depth D was fixed at 20 mm and the joint width W was changed at 10 to 40 mm, the irregular elastic sealing material 4 of the present invention and the joint interval fluctuation absorbing member 5 caused an undesired joint. It can be seen that the stress applied to the adhesive interface at the time of tension is reduced as compared with the case where only the fixed elastic sealing material 4 is used (d = D). In addition, by making the distance between the lower surface of the joint interval fluctuation absorbing member 5 and the main surface of the back-up material 3 closer to d = 0 mm, the effect of reducing the stress at the time of tension is further increased.

[Compression test 1] Similar to the tensile test 1, the joint depth D was constant at 20 mm, and the joint width W was 10,2.
0, 30, 40 mm, d = D, d = 1/2 D, d = 0
Then, a test body using both the amorphous elastic sealing material 4 and the joint interval fluctuation absorbing member 5 was prepared, and the 50% compressive stress (kgf / cm ² ) was evaluated. The result is shown in FIG. From the above results, when the joint depth D was fixed at 20 mm and the joint width W was changed at 10 to 40 mm, the irregular elastic sealing material 4 of the present invention and the joint interval fluctuation absorbing member 5 caused an undesired joint. It can be seen that the stress applied to the bonding interface during compression is reduced as compared to the case where only the fixed elastic sealing material 4 is used (d = D). Further, similarly to the tensile test results, the effect of reducing the stress during compression tends to be greater by reducing the distance between the lower surface of the joint interval fluctuation absorbing member 5 and the main surface of the backup material 3. Here, when the tensile test 1 and the compression test 1 are compared with each other, when the irregular elastic sealing material 4 is used alone, that is, when d = D in this test, when the joint expands and contracts, the tensile stress increases. It can be seen that the compressive stress is remarkably larger than that of, and the stress generated at the bonding interface is large. Therefore, the following compression test was performed under further changed conditions.

[Compression Test 2] As shown in FIG. 12 (a), the joint width 26 is fixed at the joint width W = 20 mm, and the joint depth 26 is changed to form the joint portion 26 (that is, the joint interval fluctuation absorbing member 5). The length d = D in the joint depth direction of the portion constituted only by the lower surface and the amorphous elastic sealing material 4), and as shown in FIG.
The gap d between the lower surface of the joint spacing fluctuation absorbing member 5 and the main surface of the backup material 3 adjusted to 5 mm is the length d = 1/2 in the depth direction of the joint of the portion constituted only by the amorphous elastic sealing material 4. D filled with an amorphous elastic sealing material 4, and as shown in FIG.
= The joint gap fluctuation absorbing member 5 buried until the lower surface of the joint gap fluctuation absorbing member 5 adjusted to 5 mm and the main surface of the backup material contact each other (that is, d = 0 mm)
For each of the joint depths D = 10, 20, 30,
50% compressive stress when changed to 40 mm (kgf / c
m ² ) was evaluated. The result is shown in FIG. From the above results, the joint width W is made constant by using the irregular-shaped elastic sealing material 4 of the present invention and the joint interval fluctuation absorbing member 5 in comparison with the case where only the irregular-shaped elastic sealing material 4 is used (d = D). It can be seen that even when the depth D is changed, the stress applied to the bonding interface during compression is reduced. That is, by reducing the distance between the lower surface of the joint interval fluctuation absorbing member 5 and the main surface of the backup material 3, the effect of reducing stress during compression tends to be greater.

[Compression Test 3] As shown in FIG. 12 (a), the joint depth 26 is made constant while the joint depth D is constant at 20 mm, and the joint width 26 is changed (that is, the joint interval fluctuation absorbing member 5 is used). The length d = D in the joint depth direction of the portion constituted only by the lower surface and the amorphous elastic sealing material 4), and as shown in FIG.
The distance between the lower surface of the joint interval fluctuation absorbing member 5 adjusted to 1/2 W and the main surface of the backup material 3 is the length d in the depth direction of the joint of the portion constituted only by the amorphous elastic sealing material 4 = 12D filled with an amorphous elastic sealing material 4, as shown in FIG.
= The joint space fluctuation absorbing member 5 buried until the lower surface of the joint space fluctuation absorbing member 5 adjusted to 1/2 W comes into contact with the main surface of the backup material (that is, d = 0 mm)
, The joint width W = 10, 20, 30, 4
50% compressive stress when changed to 0 mm (kgf / cm
² ) evaluated. FIG. 16 shows the result. According to the above results, when the joint width W is 10 to 40 mm, the irregular elastic sealing material 4 of the present invention and the joint interval fluctuation absorbing member 5 are used together, and only the irregular elastic sealing material 4 is used (d
= D), it can be seen that the stress applied to the bonding interface during compression is reduced. It was also found that by embedding the joint interval fluctuation absorbing member 5 to the joint bottom, even when the joint width W fluctuated, the stress during compression was almost constant. This is the width w = 1/2 W of the joint interval fluctuation absorbing member 5 in the width direction.
(Mm), it is considered that at a constant compression ratio (50%), the joint interval fluctuation absorbing member 5 absorbs a stress at the time of compression at a constant ratio. This suggests that the effect of reducing the stress applied to the bonding interface can be further increased by the shape of the joint interval fluctuation absorbing member 5.

[Compression Test 4] As shown in FIG. 12A, the joint 26 is formed with the joint depth D / joint width W being fixed at 1 (ie, the lower surface of the joint interval fluctuation absorbing member 5 and the joint 26). The length d = D in the joint depth direction of the portion constituted only by the amorphous elastic sealing material 4), FIG.
(B) As shown in (b), the lower surface of the joint interval fluctuation absorbing member 5 and the back-up material 3 adjusted to have the joint width direction length w = 1/2 W
The distance d from the main surface of the joint in the depth direction of the joint formed by the amorphous elastic sealing material 4 alone is d =
12D filled with an amorphous elastic sealing material 4, and as shown in FIG. 12C, the lower surface and the back-up of the joint interval fluctuation absorbing member 5 adjusted to have a length w = 1/2 W in the joint width direction. The joint depth D = joint width W = 10, 20, 30, 4 for each of the joint interval fluctuation absorbing members 5 buried until the main surface of the material comes into contact (that is, d = 0 mm).
50% compressive stress (kgf / cm ² ) by changing to 0 mm
Was evaluated, and the results are shown in FIG. based on the above results,
In the joint structure in which the joint depth D / joint width W is constant at 1, the irregular elastic sealing material 4 and the joint interval fluctuation absorbing member 5 of the present invention are used in combination with the irregular elastic sealing material 4 alone (d = It can be seen that the stress applied to the bonding interface during compression is reduced as compared to D). Further, even if the joint width W and the joint depth D fluctuate from this test,
It was found that the stress applied to the bonding interface was constant irrespective of the presence or absence of joint space fluctuation absorbing member 5 or the degree of embedding joint space fluctuation absorbing member 5. It is considered that this is because the joint depth D / joint width W is fixed and the length w in the width direction of the joint interval fluctuation absorbing member 5 is set to a constant ratio with respect to the joint width W. Then the joint width is 1
Without being limited to 0 to 40 mm, it is possible to further predict the stress at a constant compression, which is useful in joint design.

[Compression test 5] As shown in FIG. 12 (c), the joint depth D = joint width W = 20 mm, which is constant, and the lower surface of the joint interval fluctuation absorbing member 5 adjusted to the width direction length w and the backup. The joint portion 26 is formed by embedding the joint interval fluctuation absorbing member 5 until the main surface of the material 3 comes into contact (that is, d = 0 mm) (that is, the lower surface of the joint interval fluctuation absorbing member 5 and the irregular elasticity). (The length d = D in the joint depth direction of the portion constituted only by the sealing material 4) is adjusted to the width w = 0, 3, 5, 10, 15 mm in the width direction of the joint interval fluctuation absorbing member 5. Then, the 50% compressive stress (kgf / cm ² ) for each was evaluated. FIG. 18 shows the result. The joint width fluctuation absorbing member 5 having a length w = 0 mm in the width direction is shown in FIG.
The joint which is constituted only of the irregular elastic sealing material 4 which does not use the joint interval fluctuation absorbing member 5 corresponding to (a). According to the above results, by using the irregular elastic sealing material 4 of the present invention and the joint interval fluctuation absorbing member 5 together,
Increasing the length w in the width direction of the joint interval fluctuation absorbing member 5 has the effect of further reducing stress during compression,
It can be seen that after reducing to a certain value, it becomes almost flat. This is because when the compression ratio is constant, if the length w in the width direction of the joint space fluctuation absorbing member 5 is small, the joint space fluctuation absorbing member 5 alone cannot absorb the compressive stress, and the deformation of the irregular elastic sealing material 4 can be prevented. On the other hand, when the length w in the width direction of the joint gap fluctuation absorbing member 5 becomes a predetermined value or more, the joint gap fluctuation absorbing member 5 becomes a compressive stress only due to deformation of the joint gap fluctuation absorbing member 5. This suggests that the tensile / compressive stress of 5 itself has a great effect on the present invention.

Therefore, the extent to which the joint interval expands or contracts (day,
Joint expansion and contraction due to expansion and contraction of panel 1 caused by inter-story displacement of building due to seasonal temperature change and earthquake / wind pressure)
Is calculated to obtain the joint deformation rate,
The hollow portion 5 of the joint interval fluctuation absorbing member 5 to be used based on the value.
By determining the width of a, the stress applied at the time of compressive deformation of the joint can be adjusted. As described above, in the present invention, the stress applied to the joint can be significantly reduced as compared with the case where the amorphous elastic sealing material 4 is used alone.

[Comparative Test] As a comparative test of each of the above tests, FIG. 1 was used in place of the joint interval fluctuation absorbing member 5 of the present invention.
9, a tensile test for comparison was performed using a conventional sealing member 28 having a leg 27 and called a conventional dry seal. As the fixed-shaped seal member 28, a commonly used hard PVC (Shore D hardness 40) was used. The test was performed under the same test conditions as in the tensile test 1 including the positional relationship of the fixed-shaped seal member 28 represented by (a), (b), and (c) in the table. Table 1 shows the results.

[0039]

[Table 1]

In the conventional fixed sealing member 28, the leg 27
However, since it is not made of an elastic expansion / contraction structure or an elastic expansion / contraction material like the joint spacing fluctuation absorbing member of the present invention, even if the legs 27 are embedded, the effect of reducing the stress is not obtained, and conversely, it becomes higher.

In order to secure the long-term reliability of the joint structure, in the present invention, the tensile and compressive stresses at the joint having the main surface 3a of the backup material 3 at the bottom are not embedded in the joint interval fluctuation absorbing members 5, 5c. It is set lower than the case, and the joint structure may be designed so as to satisfy the equations (1) and (2) shown in the section of the means for solving the problem as described above. However, as described above, even when the joint width W is less than 10 mm or more than 40 mm, long-term sealing performance can be ensured by adopting the joint structure of the present invention.

As can be seen from each of the above tests, the materials of the amorphous elastic sealing material 4 and the joint interval fluctuation absorbing members 5, 5c are set so that the tensile / compressive stress is within the above range, and the above test results and the like are set. For reference, if the joint space fluctuation absorbing members 5 and 5c are designed to be embedded from the bottom of the joint determined by the backup material 3 to the position in the depth direction of the joint of the amorphous elastic sealing material 4, the design of the present invention is further improved. It is convenient in achieving the purpose.

[0043]

As described above, in the joint structure using the irregular elastic sealing material of the present invention and the joint interval fluctuation absorbing member, the following excellent effects can be obtained. The joint depth between the lower surface of the joint interval fluctuation absorbing member and the main surface of the backup material, or the upper surface of the joint interval fluctuation absorbing member, and the length d in the joint depth direction of the portion constituted only by the amorphous elastic sealing material. Is D ≧ D
If 10 mm and 10 mm ≦ W ≦ 20 mm, 0 ≦ d <
If W / 2 + 5 mm ≦ D or D ≧ W / 4 + 5 mm and 20 mm ≦ W ≦ 40 mm, 0 ≦ d <W / 4 + 10
When an amorphous elastic sealing material is used in the condition range of mm ≦ D, and the joint interval fluctuation absorbing member is an elastic expansion / contraction structure or an elastic expansion / contraction material, expansion and contraction of the joint interval is performed by the joint interval fluctuation absorbing member and the irregular elastic sealing. Since the material can be absorbed by the expansion and contraction of the material, the stress applied to the amorphous elastic sealing material is dispersed and absorbed even if the joint spacing fluctuates. Cracks due to cracks are also eliminated. In other words, when the joint interval fluctuates, the joint interval fluctuation absorbing member expands and contracts and absorbs the joint interval fluctuation without expanding or contracting the amorphous elastic sealing material.

When the joint gap fluctuation absorbing member is buried from the bottom of the joint determined by the backup material to an appropriate position in the depth direction of the irregular elastic sealing material, the joint gap fluctuation absorbing member, which is the expansion and contraction of the joint gap fluctuation absorbing member, is absorbed. The effect and the effect of reducing the stress and the stress concentration at the adhesive interface of the amorphous elastic sealing material, that is, the stress concentration portion, are further ensured. In the joint design, the joint width (W) and joint depth (D) are reduced. The relationship is changed to D / W
= 1/1 to about 1/3 (Conventionally, if the joint is shallow,
There was a risk of peeling due to insufficient bonding area and breakage due to deterioration from the surface layer, and if it was too deep, there was concern about damage due to curing inhibition or delay in curing depending on the type of sealing material. From the viewpoint of preventing stress concentration on the bonded portion due to the fluctuation of the joint, the joint design within such a range was required), and the joint depth and joint width could be increased. Even when the joint depth or joint width is increased, the elastic expansion / contraction performance and size of the joint interval fluctuation absorbing member, the shape and the length d of the irregular-shaped elastic sealing material in the joint depth direction.
, Stress concentration at the bonding interface of the amorphous elastic sealing material due to the fluctuation of the joint spacing can be reduced. That is, the joint spacing fluctuation absorbing member reduces the stress and stress concentration at the adhesive interface of the irregular-shaped elastic sealing material, particularly at the stress concentration portion, and the degree of freedom in joint design (width and depth) is improved. Can be designed deeply, and the bonding reliability based on the increase in the bonding area is improved.

When a one-component amorphous elastic sealing material is used in a conventional joint, the curing proceeds from the surface due to the moisture in the air after the application, and the joint spacing changes in the uncured state due to expansion and contraction. Then, there was a problem that a crack was generated in the surface hardened layer. However, in the present invention, even when a one-component type amorphous sealing material was used, the expansion and contraction fluctuation of joint spacing including the above-mentioned cracking occurred. Since the manifestation of various physical properties caused by the above-mentioned problem is eliminated, it is also possible to use a one-component amorphous elastic sealing material which cannot be used in the conventional joint structure. This dramatically improves the workability during construction.The joint distance fluctuation absorbing member is determined from the bottom of the joint determined by the backup material and the depth of the amorphous elastic sealing material. In order to prevent the tensile and compressive stress generated by (expansion and contraction) from exceeding the adhesive strength (strength) of the amorphous elastic sealing material for a long period of time, the irregular elasticity under the assumption of the expansion and contraction rate of joint spacing and the long term Since it can be set as appropriate by considering the safety factor in the relationship between the design strength of the sealing material,
As described above, the degree of freedom in joint design is greatly improved.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an example of a joint structure according to the present invention;

FIG. 2 is an explanatory sectional view showing an example of a joint structure according to the present invention;

FIG. 3 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 4 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 5 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 6 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 7 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 8 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 9 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 10 is an explanatory sectional view showing an example of the joint structure of the present invention.

FIG. 11 is an explanatory view showing the structure of a test piece used for stress measurement of a joint structure according to the present invention.

FIG. 12 is an explanatory view showing a positional relationship of a joint interval fluctuation absorbing member in a test piece used for stress measurement of a joint structure according to the present invention.
Indicates that the degree of embedding of the joint interval fluctuation absorbing member is 50%, (C)
Represents the case where the embedding degree of the joint interval fluctuation absorbing member is 100%.

FIG. 13 is an explanatory diagram showing a test result of a tensile test 1.

FIG. 14 is an explanatory diagram showing test results of compression test 1.

FIG. 15 is an explanatory diagram showing a test result of compression test 2.

FIG. 16 is an explanatory diagram showing a test result of compression test 3;

FIG. 17 is an explanatory diagram showing a test result of compression test 4.

FIG. 18 is an explanatory diagram showing a test result of a compression test 5;

FIG. 19 is an explanatory cross-sectional view illustrating the shape of a comparative standard sealing member used for stress measurement of the joint structure of the present invention.

FIG. 20 is an explanatory view showing a conventional joint structure, in which (a) is filled with a sealing material which becomes an elastic material after curing;
(B) with a standard sealing member

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 exterior panel 2 joint 2 a joint bottom 2 s gap 3 backup material 3 a main surface of backup material 4 irregular elastic sealing material 5, 5 c joint interval variation absorbing member 5 a hollow portion 5 b umbrella portion 5 d leg portion 5 e recess 20 exterior panel 21 Joint 22 Sealing material 23 Backup material 24 Standard sealing member 25 Test piece 26 Joint 27 Leg 28 Standard sealing member

Claims (8)

(57) [Claims] A joint structure using an irregular elastic sealing material and a joint interval fluctuation absorbing member, wherein the irregular elastic sealing material is formed by a joint depth (D) and joint width (W) determined by a main surface of a backup material. ), The distance (d) in the joint depth direction of the space between the lower surface of the joint space fluctuation absorbing member and the main surface of the backup material, or the upper surface of the joint space fluctuation absorbing member and the portion composed only of the amorphous elastic sealing material. Is D ≧ 10 mm and 10 mm ≦ W
0 ≦ d <W / 2 + 5 mm, or D ≧ W / 4 + 5 mm and 20 mm <W ≦
In the case of 40 mm, fill in the range of 0 ≦ d <W / 4 + 10 mm, and the tensile and compressive stress generated at the bonding interface between the amorphous elastic sealing material and the joint wall surface due to the change in joint spacing are the same. A joint structure having a cross-sectional shape of the above and set to be lower than the tensile and compressive stress generated at the bonding interface between the irregular elastic sealing material and the joint wall surface in the joint structure filled only with the irregular elastic sealing material. 2. The joint structure according to claim 1, wherein the joint interval fluctuation absorbing member is buried from a bottom of the joint determined by a backup material to an appropriate position in a depth direction of the irregular elastic sealing material. 3. The joint structure according to claim 1, wherein a joint interval fluctuation absorbing member made of an elastic expansion / contraction structure or an elastic expansion / contraction material protrudes from the backup material toward the joint opening side. 4. The joint structure according to claim 1, wherein the joint interval fluctuation absorbing member is buried from an opening side of the joint to an appropriate position in a depth direction of the amorphous elastic sealing material. 5. A joint spacing fluctuation absorbing member buried from an opening side of a joint to an appropriate position in a depth direction of an amorphous elastic sealing material, and a joint spacing fluctuation absorbing member protruding from the backup material. The joint structure according to claim 4, wherein the joints are in contact with each other. 6. The joint structure according to claim 1, wherein the joint interval fluctuation absorbing member is an elastic expansion / contraction structure or an elastic expansion / contraction fluctuation absorbing member. 7. The joint structure according to claim 1, wherein the joint space fluctuation absorbing member is a hollow elastic elastic structure or an elastic elastic material. 8. The joint structure according to claim 1, wherein the joint interval fluctuation absorbing member is an elastic expansion / contraction structure or an elastic expansion / contraction material made of a foam.