JP2008150865A - Joint member and building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint member capable of further surely cutting off water, while simplifying and miniaturizing a constitution of a joint part. <P>SOLUTION: This joint member has a base material 16 having a semicircular curved surface corresponding to a joint 12 of a wall surface of concrete 20 of a building 11, and an ethylene vinyl acetate resin-based sheet 14 arranged along the curved surface of the base material 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joint member and a building.

Concrete has various factors that cause deformation such as temperature change due to heat of hydration of cement and outside air temperature, drying shrinkage, and unexpected external force, and these factors may cause cracks on the wall surface. If these cracks occur randomly on the wall surface, the aesthetics of the building will be impaired. Therefore, in general, a concrete building is provided with a joint for inducing a crack at a specific position on the wall surface.
Also, in concrete buildings, joints for concrete (horizontal joints that separate the frames of each floor, or vertical joints in the division of the sections on each floor) have joints for jointing. It is recessed.
And by filling the inside of these joints with a sealing material, the crack of concrete and the penetration | invasion of the water | moisture content to the joint part are prevented.

Conventionally, joints are formed, for example, by sticking a wooden rod (hereinafter referred to as a joint rod) to a concrete formwork, and after pouring the concrete into the concrete formwork, the concrete formwork and jointpiece are removed from the mold. Was. And the sealing material was filled in the formed joint.
However, in this case, there is a problem that the joint rod needs to be removed from the mold or the sealing material needs to be filled, and the work becomes complicated. For example, filling the inside of the joint with a sealing material requires a high degree of skill, and it takes time and effort to achieve a beautiful finish. In addition, since the sealing material is deteriorated by, for example, ultraviolet rays, there is a problem that it is necessary to replace the sealing material periodically.

Thus, for example, Patent Document 1 proposes a joint member that eliminates the need for demolding and construction of a sealing material. FIG. 13 is a diagram illustrating a joint structure of a building using the joint member.
The building shown in FIG. 13 includes concrete 310, joints 305 recessed in the wall surface of concrete 310, and joint members 300. The joint member 300 includes a wall surface base material 301, a water-stop sheet 302, and a water-permeable joint material 303.
The wall surface base material 301 is formed of a material having physical properties close to those of the concrete 310 and is disposed so as to form substantially the same plane as the wall surface of the concrete 310.
The waterproof sheet 302 is fixed to the back surface of the wall surface base material 301. For the water blocking sheet 302, non-vulcanized butyl rubber having a high elongation rate is used.
The water-permeable joint material 305 has water permeability (for example, continuous foam, inorganic fiber material, etc.) with water absorption, and is fixed to the water-stop sheet 302 and fitted to the joint 305.
With this configuration, the crack of the concrete 310 is induced at the joint 305 formation position, and the water stop function combining the water-stop sheet 302 and the water-permeable joint material 303 prevents water from entering the crack.
JP 2005-61178 A

  In the joint member 300, the water stop sheet 302 is disposed over a wider range than the joint 305 in consideration of the occurrence of cracks being displaced from the joint 305 as shown in FIG. 13. As a result, the shape of the joint member 300 is complicated as shown in FIG. 13, and there is a problem that the size of the joint member 300 is larger than the size of the joint 305 to be formed.

  Further, because of this shape, for example, a crack may occur at the boundary between the wall surface base material 301 and the concrete 310, and in that case, the water stoppage cannot be performed by the waterstop sheet 302 and the water permeable joint material 305. was there.

Furthermore, the non-vulcanized butyl rubber constituting the water-stop sheet 302 does not have sufficient adhesion strength (for example, 4 kgf / cm ² ) to prevent peeling from the concrete 310. For this reason, there exists a possibility that the water stop sheet | seat 302 may peel from the concrete 310 and there exists a possibility that water stop cannot be performed reliably.

  The present invention has been made in view of the problems as described above, and the object thereof is to achieve simplification and downsizing of the structure of the joint portion as compared with the conventional case, and it is possible to more reliably stop water. It is to provide a joint member and a building.

  In order to achieve such an object, the joint member of the present invention is a joint member disposed on a joint of a concrete wall surface, and includes a base material having an outer shape corresponding to the joint, and the outer shape. And an ethylene vinyl acetate resin-based sheet disposed on the substrate. According to such a joint member, simplification and downsizing of the structure of the joint portion can be realized as compared with the conventional case, and water can be stopped more reliably.

  In such a joint member, it is desirable that the ethylene vinyl acetate resin-based sheet has a raised surface. According to such a joint member, since the cement component of concrete soaks into the raised portion of the ethylene vinyl acetate resin-based sheet and grips the hair to solidify, the adhesion strength and adhesion with concrete can be improved, It is possible to reliably stop the water.

  In the joint member, the base material is preferably a cement-based material. According to such a joint member, it is possible to increase the adhesion strength and adhesion between the base material and the ethylene vinyl acetate resin-based sheet.

  In the joint member, it is preferable that the base material has an end surface that is substantially flush with the wall surface, and a notch is formed in the end surface. According to such a joint member, it is possible to break the base material at the notch portion, and thereby the vinyl acetate resin-based sheet can be deformed following the cracks while maintaining adhesion to the concrete. .

  Further, in the joint member, the notch is formed before the ethylene vinyl acetate resin sheet and the concrete are peeled off by the tensile stress generated on the wall surface, and the ethylene vinyl acetate resin sheet is It is desirable to break the base material before it breaks. According to such a joint member, it is possible to perform water stop more reliably.

  Further, the joint member may have a filler filled in the notch. According to such a joint member, the shape of the joint on the wall surface can be closed. Further, when a wooden rod is used as the filler, it can be easily and reliably fixed to the concrete formwork by, for example, nail fastening.

  In order to achieve this object, the building of the present invention includes a concrete wall, a joint recessed in the wall surface of the wall, an ethylene vinyl acetate resin-based sheet covering the joint, and the ethylene acetate And a substrate having an end face that is disposed on the vinyl resin sheet and forms substantially the same plane as the wall surface. According to such a building, the structure of the joint portion can be made simple and small, and it is possible to reliably perform the cracking and water stop of the joint portion.

  Moreover, in such a building, before the adhesion of the ethylene vinyl acetate resin-based sheet and the concrete is peeled off by the tensile stress generated on the wall surface, and before the ethylene vinyl acetate resin-based sheet is torn It is preferable that the notch part which fractures | ruptures the said base material is formed in the said end surface of the said base material. According to such a building, it is possible to prevent the ethylene vinyl acetate resin-based sheet from being broken or peeled off from the concrete, and water can be stopped more reliably.

  According to the present invention, simplification and downsizing of the configuration of the joint portion can be realized, and water can be reliably stopped.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

=== First Embodiment ===
FIG. 1 is a cross-sectional view showing a building 11 having a joint member 10 ′. A building 11 shown in FIG. 1 includes a concrete 20, a joint 12, and a joint portion 10 '. In this embodiment, the building 11 is assumed to be an exposed concrete finish.
The concrete 20 constitutes a frame (wall or the like) of the building 11.
The joint 12 is recessed in the wall surface of the concrete 20 along, for example, the vertical direction.
The joint portion 10 ′ is disposed inside the groove of the joint 12. The joint portion 10 ′ is disposed on an ethylene vinyl acetate resin-based sheet (hereinafter referred to as an EVA sheet) 14 and an EVA sheet 14 that cover the inside of the joint 12, and has an end surface that is substantially flush with the wall surface of the concrete 20. It has the base material 16 which has.
Further, a notch 17 is formed on the end surface of the substrate 16. The joint portion 10 ′ is formed based on a joint member 10 described later.

≪Configuration of joint material≫
FIG. 2 is a perspective view showing an example of the configuration of the joint member 10 according to the first embodiment of the present invention. The joint member 10 includes a base material 16, an EVA sheet 14, and a rod member 18 (filler).

The base material 16 has a curved surface (outer shape) having a shape (for example, a semicircular shape) corresponding to the joint 12 in FIG. 1 and an end surface that forms substantially the same plane as the wall surface of the building 11. A bar member 18 is embedded in the end surface of the base material 16. As the base material 16, for example, a cement-based material such as polymer cement mortar or mortar is preferable. These cement-based materials have high adhesion strength and adhesion to the EVA sheet 14, and do not require demolding after forming joints. In this embodiment, polymer cement mortar is applied to the substrate 16.
The rod member 18 is, for example, a wooden joint rod having a trapezoidal cross section. 1 is formed by removing the bar member 18 from the joint member 10. As shown in FIG.
The EVA sheet 14 is a water stop material excellent in elongation and water stop, and is disposed along the curved surface of the base material 16.

  FIG. 3 is a diagram for explaining the structure of the EVA sheet 14. As shown in FIG. 3, the EVA sheet 14 includes a sheet main body 14a and a raised layer 14b formed on the surface of the sheet main body 14a. Since the raised layer 14b is formed on the EVA sheet 14, the components of the cement such as the base material 16 and the concrete 20 are soaked between the raised layers 14b to solidify the hair and solidify them. The nature will increase.

Table 1 compares the physical properties of the EVA sheet 14 and the non-vulcanized butyl rubber used as the water-stop sheet 302 of the joint member 300 in FIG.

The adhesion strength indicates the adhesion strength with concrete (or mortar). From Table 1, it can be seen that the adhesion strength and shear strength of the EVA sheet 14 are higher than those of the non-vulcanized butyl rubber. For example, from Table 1, non-vulcanized butyl rubber has an adhesion strength of 1 kgf / cm ² and does not satisfy the strength (4 kgf / cm ² ) required to prevent peeling (including lifting) from concrete. . On the other hand, since the adhesion strength of the EVA sheet 14 is 9 kgf / cm ² , no peeling occurs.

  The elongation percentage of the EVA sheet 14 is 500%. This is smaller than the elongation of the non-vulcanized butyl rubber, but is sufficient to follow the cracks in the concrete 20. However, this elongation is the elongation in the in-plane direction (A direction) in FIG. 3, and the elongation in the thickness direction (B direction) is different from this value.

FIG. 4 is a diagram showing an example of the relationship between the stress and the elongation in the thickness direction in the EVA sheet 14. FIG. 4 shows that the elongation in the thickness direction with respect to the stress of the adhesion strength (9 kgf / cm ² ) described above exceeds 10%. For example, in FIG. 3, when the thickness of the EVA sheet 14 is 1 mm, even if a tensile stress of 9 kgf / cm ² is applied in the B direction, the EVA sheet 14 extends only about 0.1 mm in the B direction. In other words, the EVA sheet 14 in the surface layer portion of the wall surface of the building 11 shown in FIG. 1 has a small elongation, and when cracks occur, the EVA sheet 14 and the concrete 20 peel off at this portion, or the EVA sheet 14 There is a possibility of tearing.

  Therefore, in the joint member 10 of the present embodiment, the notch portion 17 is provided in the base material 16. The notch 17 is formed to break the base material 16 before the adhesion of the EVA sheet 14 and the concrete 20 on the surface layer of the wall surface is peeled off and before the EVA sheet 14 is broken. In FIG. 1, when the base material 16 breaks at the notch 17, the EVA sheet 14 can follow the cracks while maintaining the adhesion between the broken base material 16 and the concrete 20. Therefore, water can be reliably stopped by the EVA sheet 14.

≪Method of forming joint material≫
5A to 5C are diagrams illustrating an example of a method for forming the joint member 10. First, as shown in FIG. 5A, the EVA sheet 14 is disposed along the inner surface of the mold 30 having a semicircular cross section. As shown in the figure, the bar member 18 is held above the EVA sheet by a jig (not shown) or the like. Then, as shown in FIG. 5 (b), polymer cement mortar is poured between the bar member 18 and the EVA sheet 14. After the polymer cement mortar is hardened (after the base material 16 is formed), the mold 30 is removed as shown in FIG.

  Thus, the joint member 10 can be easily formed. Further, the joint member 10 can be formed by a method other than this method. For example, after the EVA sheet 14 is disposed in the mold 30, a predetermined amount of polymer cement mortar may be poured into the EVA sheet 14, and the bar member 18 may be pushed from above before the polymer cement mortar is solidified.

≪Building construction method≫
FIGS. 6A to 6C are diagrams for explaining an example of a construction method of the building 11 using the joint member 10.
First, as shown in FIG. 6A, the joint member 10 is fixed at a predetermined position on the concrete placing side in the concrete mold 22. This fixing can be performed by, for example, nailing the concrete mold 22 and the bar member 18.
Then, as shown in FIG. 6 (b), the concrete 20 is driven into the concrete mold 22.
After the concrete 20 is hardened, the concrete mold 22 and the bar member 18 are removed. By doing so, as shown in FIG. 6C, the building 11 including the joint 12 and the joint portion 10 'is formed. The adhesion strength between the wooden rod member 18 and the base material 16 of the polymer cement mortar is weak (for example, 1 kgf / cm ² ), and the rod member 18 can be easily removed from the substrate 16.

≪Other application examples≫
FIG. 7 is a diagram illustrating another application example of the joint member 10. 7 includes a concrete 20, a joint portion 10 ', a reinforcing bar 40, a non-shrink mortar 50, and a vinyl chloride pipe 52.
The reinforcing bars 40 are formed in a lattice pattern by the horizontal bars 40a and the vertical bars 40b, and are arranged in the building 11 'with a space therebetween.
The vinyl chloride pipe 52 is a pipe that has almost no interface with the concrete 20 and is embedded between the reinforcing bars 40.
The non-shrink mortar 50 is filled in the vinyl chloride pipe 52.
With the above configuration, since the thickness of the concrete 20 between the vinyl chloride pipe 52 and the joint member 10 'is thinner than the surrounding area, the cracks 21 generated in the building 11' are removed from the vinyl chloride. It is possible to reliably induce between the pipe 52 and the joint member 10 '.
Therefore, the EVA sheet 14 can reliably stop water from entering the cracks 21 of the concrete 20 and can prevent rusting and deterioration of the reinforcing bars 40.

=== Second Embodiment ===
FIG. 8 is a perspective view showing an example of the joint member 100 according to the second embodiment of the present invention. In FIG. 8, parts having the same configuration as in FIG.
The joint member 100 shown in FIG. 8 includes an EVA sheet 14 and a base material 16a. Moreover, the base material 16a has, for example, a semicircular curved surface and an end surface that forms substantially the same plane as the wall surface. And the linear notch part 19 is formed in the end surface.

  The joint member 100 is formed, for example, by arranging the EVA sheet 14 on the inner surface of the mold 30 similar to that in the first embodiment, pouring polymer cement mortar into the mold member 15 and then hardening it, and then forming the notch 19 on the end surface. can get. In addition, the notch part 19 can be formed by excising polymer cement mortar using a cutter etc., for example. Similarly to the notch 17 described above, the notch 19 also breaks the substrate 16a before the adhesion of the EVA sheet 14 and the concrete 20 on the surface layer of the wall surface is peeled off and before the EVA sheet 14 is torn. It is provided in an appropriate size (depth) in order to make it.

  In the present embodiment, the notch 19 is hollow, but the notch 19 may be filled with, for example, low-strength mortar, resin, vinyl chloride (filler), or the like. By doing so, it is possible to close the shape of the cavity of the notch 19.

  FIGS. 9A to 9D are diagrams illustrating an example of a construction method of the building 110 using the joint member 100. The building 110 is assumed to be tiled concrete with base mortar.

First, for example, one surface of a double-sided tape (not shown) is attached to the end surface of the base material 16a of the joint member 100. And the other surface of the said double-sided tape is stuck to the predetermined position of the concrete formwork 22. In this way, the concrete mold 22 and the joint member 100 are fixed as shown in FIG.
In this state, as shown in FIG. 9B, concrete 20 is driven into the concrete mold 22.
After the concrete 20 has hardened, as shown in FIG. 9C, the concrete mold 22 is removed, and the double-sided tape is removed from the joint member 100.

  Thereafter, as shown in FIG. 9 (d), a base mortar 32, a mortar 34, a tile 36, a backup material 38, and an elastic sealing material 39 are formed by a well-known construction method for tile finishing. The sticking mortar 34 is used to bond the base mortar 32 and the tile 36, and the backup material 38 has cushioning properties. Note that the backup material 38 does not enter the notch 19, and the notch 19 remains hollow. In the present embodiment, the elastic sealing material 39 is provided. However, since the intrusion of moisture into the crack can be surely stopped by the EVA sheet 14, the elastic sealing material 39 is not provided. Good.

  Thus, in the joint member 100, since the linear notch part 19 is formed with the cutter etc., it can be set as a simpler structure, and the area of the end surface side of the base material 16a can be made still smaller. . In addition, the base material 16a can be always broken at the position of the notch portion 19, and the EVA sheet 14 can follow the cracks while maintaining adhesion with the broken base material 16a and the concrete 20, Water can be reliably stopped from entering the cracks.

=== Third Embodiment ===
In the joint members 10 and 100 described above, the notches 17 and 19 are provided so that the base material 16 and 16a can be easily broken when the concrete 20 is cracked. In the case of other than (for example, a horizontal joint portion of concrete), the notches 17 and 19 may not be provided.

FIG. 10 is a perspective view showing an example of a joint member 200 according to the third embodiment of the present invention. 10, parts having the same configuration as in FIG.
The joint member 200 shown in FIG. 10 includes a base material 16b, an EVA sheet 14, and bolts 24.
A plurality of bolts 24 are arranged at predetermined intervals on the end surface of the base material 16b. The bolt 24 is made of a corrosion-resistant material (for example, stainless steel or plastic).

11A to 11D are diagrams illustrating an example of a method for forming the joint member 200 according to the third embodiment of the present invention.
First, as shown in FIG. 11A, the EVA sheet 14 is arranged along the inner surface of the mold 30 having a semicircular cross section. And as shown in FIG.11 (b), the head side of the volt | bolt 24 is hold | maintained inside the EVA sheet | seat 14 using a jig | tool (not shown) etc., for example. At this time, the distance a shown in the figure is made sufficiently larger than the thickness of a concrete mold 23 described later. And as shown in FIG.11 (c), polymer cement mortar is poured on the EVA sheet | seat 14 in the metal mold | die 30, and the base material 16b is formed. Then, after the polymer cement mortar is hardened, the mold 30 is removed as shown in FIG.

  FIGS. 12A to 12D are cross-sectional views for explaining an example of a construction method of the horizontal joint portion of the building 210 using the joint member 200. In the concrete mold 23, an opening for passing the male screw portion of the bolt 24 is formed at a position corresponding to the bolt 24 of the joint member 200.

  First, as shown in FIG. 12A, the male screw portion of the bolt 24 protruding from the joint member 200 is screwed with the male screw portion outside the concrete mold 23 through the opening of the concrete mold 23. It tightens with the nut 26 which has the female screw part to perform. In this way, the joint member 200 is fixed to the concrete mold 23. Then, the concrete 20a in the lower floor portion is driven. By this driving, joints 12a are formed at the interface between the EVA sheet 14 and the concrete 20a.

  After the concrete 20a is hardened, the concrete 20b in the upper floor portion is driven as shown in FIG. By this driving, joints 12b are formed at the interface between the EVA sheet 14 and the concrete 20b.

  Then, after the concrete 20b is hardened, as shown in FIG. 12C, the nut 26 is removed from the male screw portion of the bolt 24, and the concrete mold 23 is removed. Finally, as shown in FIG. 12D, the male screw portion of the bolt 24 protruding from the base material 16b is cut with a sander or the like to form a bolt 24 '.

  In this way, joints 12a and 12b can be formed in the horizontal joint portion of the building 210. And the EVA sheet | seat 14 can stop the water | moisture content permeation into the joint part of the concrete 20a and the concrete 20b reliably. In the present embodiment, the joint member 200 is fixed to the concrete mold 23 by using the bolts 24 and the nuts 26 arranged on the joint member 200, but the fixing method is not limited to this. For example, it may be fixed using a double-sided tape as in the second embodiment. In that case, it is not necessary to provide the bolt 24 in the joint member 200, and the joint member 200 can be further simplified.

  As described above, according to the present invention, the base 16 having an outer shape corresponding to the joint 12 and the EVA sheet 14 arranged along the outer shape have the same size as the joint 12. A joint portion 10 'can be formed. The EVA sheet 14 has a high elongation rate in the in-plane direction of 500%, and has high adhesion strength and adhesiveness with the concrete 20, so that cracking and water stoppage of the joint portion can be reliably performed.

  In the said embodiment, although the curved-surface part of the base materials 16, 16a, 16b was made into semicircle shape, it is not limited to this. For example, you may form in shapes, such as a semi-elliptical shape and U shape. Further, for example, a trapezoidal mold may be used so that the cross section of the base material becomes a trapezoid.

  The above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

It is sectional drawing which shows the building to which the joint member which concerns on the 1st Embodiment of this invention is applied. It is a perspective view which shows an example of a structure of the joint member which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the structure of an EVA sheet | seat. It is the figure which showed the relationship between the stress in an EVA sheet | seat, and the elongation rate of the thickness direction. It is a figure which shows the formation method of the joint member which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the construction method of the building using the joint member which concerns on the 1st Embodiment of this invention. It is a figure which shows the other example of application of the joint member which concerns on the 1st Embodiment of this invention. It is a perspective view which shows an example of a structure of the joint member which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating the construction method of the building using the joint member which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the structure of the joint member which concerns on the 3rd Embodiment of this invention. It is a figure which shows the formation method of the joint member which concerns on the 3rd Embodiment of this invention. It is sectional drawing for demonstrating the construction method of the horizontal joint part of the building using the joint member which concerns on the 3rd Embodiment of this invention. It is a figure which shows the joint structure using the conventional joint member.

Explanation of symbols

10, 100, 200 Joint member (present invention)
10 'Joint part 11, 110, 210 Building 12, 12a, 12b, 305 Joint 14 EVA sheet 14a Sheet body 14b Brushed layer 16, 16a, 16b Base material 17, 19 Notch 18 Bar member 20, 310 Concrete 21 Crack 22 , 23 Concrete formwork 24 Bolt 26 Nut 30 Mold 32 Base mortar 34 Tightening mortar 36 Tile 38 Backup material 39 Elastic sealing material 40 Reinforcing bar 40a Horizontal bar 40b Vertical bar 50 Non-shrink mortar 52 Vinyl chloride pipe 300 Joint member (conventional)
301 Wall surface base material 302 Water stop sheet 303 Water permeable joint material

Claims (8)

A joint member disposed on the joint of the concrete wall,
A substrate having an outer shape corresponding to the joint;
An ethylene vinyl acetate resin-based sheet disposed on the base material along the outer shape;
A joint member comprising:   The joint member according to claim 1, wherein the ethylene vinyl acetate resin-based sheet has a raised surface.   The joint member according to claim 1, wherein the base material is a cement-based material. The substrate is
The joint member according to any one of claims 1 to 3, wherein the joint member has an end face that forms substantially the same plane as the wall surface, and a notch is formed in the end face. The notch is
The base material is ruptured before the adhesion between the ethylene vinyl acetate resin-based sheet and the concrete is peeled off and before the ethylene vinyl acetate resin-based sheet is torn by the tensile stress generated on the wall surface. The joint member according to claim 4, wherein the joint member is a thing.   The joint member according to claim 4, further comprising a filler filled in the notch. Concrete walls,
Joints recessed in the wall surface of the wall;
An ethylene vinyl acetate resin-based sheet covering the interior of the joint;
A base material disposed on the ethylene vinyl acetate resin-based sheet and having an end surface that is substantially flush with the wall surface;
A building characterized by having   Notch that breaks the base material before the ethylene vinyl acetate resin-based sheet is peeled off and before the ethylene vinyl acetate resin-based sheet is broken due to the tensile stress generated on the wall surface. The building according to claim 7, wherein the portion is formed on the end face of the base material.

Images