JP2003286767A - Lath and exterior facing structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the quality and workability of lath mortar work by proposing a new lath, which eliminates a defect of an external facing structure using a corrugated lath, and the external facing structure using the lath. <P>SOLUTION: This lath 1 is constituted by making knurls 1a, 1a, etc., with a fixed height formed on one side of a flat plate-shaped wire net in a scattered manner, manufactured by a cold drawing cutting method, and equipped with following conditions (1)-(5): (1) with reference to dimensions of diagonal lines of a lath mesh, a length of a long side is 24 mm or more and a length of a short side is 12 mm or more; (2) a thickness of an original plate is in a range of 0.6-0.9 mm; (3) the feed (notch pitch) of the original plate is in a range of 0.73-1.24 mm; (4) a lath density is in a range of 0.7-1.2 kg/m<SP>2</SP>; and (5) the number of the knurls 1a, 1a, etc., is in a range of 15-55 (pieces/m<SP>2</SP>). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in lath used as a mortar coating base, and an exterior structure using the same.

[0002]

2. Description of the Related Art A lath is a base for a painted wall or a painted ceiling, and one type of it is a metal lath, which is made by making notches at regular intervals on a base plate such as a thin steel plate or a hot-dip galvanized steel plate. Manufactured by a room temperature stretch cutting method of stretching in a direction orthogonal to.

Here, the shape of a corrugated lath, which is a type of metal lath, is shown in FIG. As shown in the figure, the corrugated lath 1'is a rectangular wire mesh having a corrugated cross-section as a whole, and peaks A and valleys B are alternately arranged in the short side direction at regular intervals to form a corrugation. Both B extend parallel to the long side.

When the corrugated lath 1'is used as a mortar coating base on a wooden outer wall, as shown in FIG. 16, a waterproof paper 2'is tacked to the outdoor side of the outer wall underlaying plate 3 and then the outdoor side thereof. Tuck the corrugated lath 1'to, and apply more mortar 4.

[0005]

However, the exterior structure using the corrugated lath 1'has the following problems. (1) One of the criteria for defining the lath specifications is the mass of lath per unit projected area (referred to as "lath density" in this specification). However, since the corrugated lath 1'has a large surface area per unit projected area because it is a corrugated cross section, if the lath density is kept constant from the viewpoint of cost, etc., the wire rod cross section becomes smaller than a flat lath, etc. It will be easier. Therefore, the ridge A and the valley B are crushed by the iron pressure applied when the mortar 4 is applied, and the corrugated lath 1'is sunk toward the outer wall underlaying plate 3 side (FIG. 17).
As a result, the coating thickness of the mortar 4 is actually insufficient even if the mortar 4 having a regular thickness is applied (the coating thickness of the mortar 4 required for the fire prevention function of the outer wall of the mortar coating). It is easy to make a miscalculation that it has not been secured), and there is a problem from the viewpoint of quality assurance.

(2) As explained in (1), the corrugated lath 1'is likely to sink due to the iron pressure. Therefore, in actual construction, do not apply the iron pressure so that the corrugated lath 1'will not sink. Tend to do. Then, due to such a shortage of the iron pressure, the mortar 4 is insufficiently wrapped around the back side of the corrugated lath 1 ', and a cavity (nest) in which the mortar 4 is not applied is generated. The occurrence of such a nest is that not only the corrugated lath 1'and the mortar 4 are not firmly attached, but also the corrugated lath 1'is gradually rusted from a portion not covered with the mortar (alkaline) 4. Since they are connected, the quality of the outer wall coated with mortar is greatly adversely affected.

(3) The lath and mortar adhere firmly,
In order for the lath to effectively reinforce the mortar, it is ideal that the center of gravity of the lath is located in the middle of the coating thickness of the mortar. However, the heights of the peaks A and the valleys B of the corrugated lath 1'are set to about half the coating thickness of the mortar 4, and the valleys B are fixed so as to abut the outer wall underboard plate 3, so The center of gravity of the lath 1'is located at a position deeper than the middle coating thickness of the mortar 4 (position closer to the outer wall lower tension plate 3 than the middle coating thickness of the mortar 4) (see FIG. 17 (b)). Therefore, the mortar 4 near the surface is not reinforced so much that cracks are likely to occur on the surface of the mortar 4.

(4) From the viewpoint of ease of applying the mortar, it is preferable that the surface of the lath has less irregularities.
Since the corrugated lath 1'has a corrugated cross-section and its surface is corrugated, when applying the mortar 4 to it, a trowel pressure higher than a certain level is required, and the workability is poor.

(5) Since the corrugated lath 1'is soft and easily bent due to the reason described in (1), in order to prevent the corrugated lath 1'from sinking even when applying the mortar 4, the corrugated lath 1'can be prevented. It is necessary to shorten the pitch of the tucker that fastens the to the outer wall subbing plate 3. However, if the fastening pitch is shortened, the number of holes perforated in the waterproof paper 2 ′ increases, the waterproof performance of the waterproof paper 2 ′ deteriorates, and the outer wall underlayment plate 3 absorbs moisture. As a result, the outer wall subbing plate 3 is warped back (the outer wall subbing plate 3 is exposed), and the corrugated laths 1 ′ fastened to this at a short pitch receive the behavior of the outer wall subbing plate 3 properly.
The mortar 4 becomes fragile.

(6) Generally, the waterproof paper 2'has a property that it is more easily stretched in the width direction (the arrow direction in FIG. 16) than the length direction for the reason of its manufacture. The waterproof paper 2'itself sags in the width direction when it is attached. In addition, the peak A and the valley B of the corrugated lath 1 '
Are arranged so as to extend in the horizontal direction, so that the slack of the waterproof paper 2'is likely to gather on the back side of the mountain A of the corrugated lath 1 '. Therefore, except when the waterproof paper 2'is non-hygroscopic, it has permeated into the outer wall underlayment plate 3 due to the moisture originally contained in the outer wall underlayment plate 3 or the rainfall before the attachment of the waterproof paper 2 '. Due to moisture, rainfall after attaching the waterproof paper 2 ', moisture in the air, moisture contained in the applied mortar 4, the waterproof paper 2'is a horizontal stripe pattern along the back side of the mountain A of the corrugated lath 1'. Swells to form. Therefore, the coating thickness of the mortar 4 becomes unbalanced, and a horizontal stripe pattern crack occurs on the surface of the mortar 4 (see FIG. 17B).

(7) Unless the waterproof paper 2'is of a material that does not particularly absorb water or has been treated to prevent it from absorbing water, the water contained in the applied mortar 4 is the waterproof paper 2 '. Since it passes through to some extent, the outer wall subbing plate 3 absorbs moisture. Then, the outer wall subbing plate 3 is cracked, and cracks are generated on the surface of the mortar 4 as described in (5).

The present invention has been made in view of the above circumstances, and an object of the present invention is to use a novel lath that solves the above-mentioned drawbacks of the exterior structure using the corrugated lath 1'and a new lath. The proposed exterior structure improves the quality and workability of lath mortar construction.

[0013]

The invention according to claim 1 is
A flat wire mesh is formed on one side with humps of a certain height and is manufactured by a room temperature stretch cutting method. The following (1) to (5)
The lath is characterized by satisfying the conditions of. (1) The diagonal dimension of the lath is longer than 24 (mm) and shorter side 1
2 (mm) or more (2) Original plate thickness is 0.6 to 0.9 (mm) (3) Original plate feed (step pitch) is 0.73 to 1.24
(Mm) (4) Lass density is 0.7 to 1.2 (kg / m ² ) (5) Number of humps is 15 to 55 (pieces / m ² ).

The shape of such a lath is close to a flat lath, and when the lath density is constant, the cross section of the wire becomes larger than that of a corrugated lath, and it is difficult for the mortar to sink due to the iron pressure when applying mortar. Insufficient thickness is unlikely to occur. Also, since it is difficult to sink due to the iron pressure, the pitch of the fasteners (tucker needles, claw nails, etc.) for fastening the lath to the outer wall underlay plate can be increased, increasing the number of holes in the waterproof paper. → It is possible to prevent a vicious cycle of "absorption caused by moisture absorption of the outer wall underlaying plate" → "Mortar cracking due to the behavior of the outer wall underlaying plate". In addition, since the lath is difficult to sink, the iron pressure can be applied to the back side of the lath so that the mortar can be firmly wrapped around, and as a result, the lath is completely covered by the mortar and is unlikely to rust. Moreover, since the humps formed on the one side of the lath with scattered dots at a certain height play a role of a spacer, the flat wire netting area occupying most of the lath faces the outer wall underlaying plate at a certain distance in parallel with it. To do. Therefore, unlike the corrugated lath with a wavy surface, it does not require much iron pressure when applying the mortar, and the workability is good. Furthermore, if the height of the hump is set so that the flat wire mesh region of the lath is located in the middle of the coating thickness of the mortar, the mortar is effectively reinforced by the lath, and cracking of the mortar can be suppressed.

Further, as a result of repeating various construction experiments, the inventor determines the diagonal size of the lath, the thickness of the original plate and the feed (step pitch) when the lath is manufactured by the cold drawing method. By setting the wire rod cross section, lath density, and number of humps as described in (1) to (5) above, the number of humps is reduced as much as possible, but it is difficult to bend due to the iron pressure, and with the gold scissors normally used in the field. It was confirmed that laths that can be cut and have good adhesion to mortar can be realized at low cost.

The invention according to claim 2 is the lath according to claim 1, characterized in that the hump is subjected to rust prevention treatment. Further, the invention according to claim 3 is a lath characterized in that humps having a constant height are scatteredly formed on one surface of a flat wire mesh, and the humps are subjected to rust prevention treatment.

According to such a lath, since the hump portion which is not completely buried in the mortar does not rust even after the construction, rust progresses from here to the flat wire mesh region of the lath, and the mortar is It can prevent neutralization.

The invention according to claim 4 is a waterproof surface material attached to the outdoor side of the outer wall subbing board, and the waterproof surface material is fastened to the outer wall subbing board on the outdoor side. An exterior structure, comprising: the lath according to any one of claims 1 to 3; and a mortar including the lath and applied to the outdoor side of the waterproof surface material.

In such an exterior structure, since the lath is not the corrugated lath but the mortar coating base, it is easy to secure the coating thickness of the mortar, the lath is not easily rusted, cracks in the mortar can be suppressed, and the workability is improved. You can enjoy the advantages mentioned above, such as good.

According to a fifth aspect of the present invention, in the exterior structure according to the fourth aspect, the waterproof surface material includes an asphalt compound layer and is provided with an uneven surface formed by scattering a large number of projections on the indoor side. Is characterized by.

In such an exterior structure, since the waterproof surface material includes an asphalt compound layer having an extremely high waterproof property, it is possible to prevent the outer wall underlaying plate from absorbing moisture and suppress the occurrence of cracks in the mortar due to the outer wall underlaying plate being exposed. it can. Also,
Since the asphalt compound layer has great cold flow and viscoelasticity, the holes made in the waterproof surface material by the fasteners that fasten the lath to the outer wall underlaying plate are due to the repair function (nail hole sealing function) of the waterproof surface material itself. It is immediately closed and the waterproof function of the waterproof surface material is not impaired. In addition, when the outdoor surface of the waterproof surface material is the asphalt compound layer as it is, since the waterproof surface material does not absorb moisture in rainwater or mortar during construction, it may cause flaking,
It is possible to suppress the occurrence of cracks due to the imbalance of the mortar coating thickness.

According to a sixth aspect of the invention, in the exterior structure according to the fifth aspect, the waterproof surface material is provided with a base layer made of non-hygroscopic fiber on the outdoor side.

Since the base layer on the outdoor side of the waterproof surface material in such an exterior structure is made of a non-hygroscopic fiber, the waterproof surface material is applied in the same manner as when the outdoor surface of the waterproof surface material is an asphalt compound layer as it is. It is possible to prevent the occurrence of cracks by absorbing rainwater in the mortar and moisture in the mortar, and to suppress the occurrence of cracks due to the imbalance of the coating thickness of the mortar.

According to a seventh aspect of the present invention, in the exterior structure according to any one of the fourth to sixth aspects, two or more laths are formed such that the hump of one lath and the hump of another lath overlap each other. It is characterized by connecting.

In this exterior structure, since the humps are overlapped when connecting two or more laths, the humps are not crushed by a trowel pressure and the like, and the flat wire mesh region occupying most of the laths has a mortar coating thickness. Holds securely in the middle position. Further, by stacking the humps on each other, it is possible to easily connect two or more laths, which improves the workability.

According to an eighth aspect of the present invention, in the exterior structure according to any one of the fourth to seventh aspects, the fastening tool for fastening the lath to the outer wall underlaying plate is provided with a distinctive display. It is characterized by being done.

According to such an exterior structure, since the fasteners such as the tucker needle and the claw nail are marked with the distinguishing property, the range where the fasteners have already been driven and the fasteners have still been driven. It is possible to easily distinguish visually from the range where there is not, and it is possible to improve workability and quality.

According to a ninth aspect of the present invention, in the exterior structure according to any one of the fourth to eighth aspects, there is provided a long corner ruler fixed to an outside corner of the outer wall underlaying plate. In the exterior structure in which the lath is fastened to the outer wall underlaying plate via the corner ruler, the corner ruler has two side corner mounting portions fixed along the outside-side projected corners of the outer wall underlaying plate, and these two It is characterized in that the outer angle formed by the corner mounting portion of the side is divided into two equal parts, and the lath supporting portion that supports the projected corner portion of the lath has a three-pronged cross section.

In such an exterior structure, since the lath is fastened to the outdoor side projected corner of the outer wall underlaying plate through the corner ruler having a three-pronged cross section, the flat wire mesh region occupying most of the lath is the projected corner. Even in the case, the mortar coating thickness is reliably maintained at the middle level.

According to a tenth aspect of the present invention, in the exterior structure according to the ninth aspect, the lath supporting portion is provided with a mortar insertion hole.

In such an exterior structure, since the lath support portion of the corner ruler has a high degree of openness, even though a foreign member is embedded in the mortar, cracks ( It is possible to suppress the occurrence of cracking.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description, the same elements will be denoted by the same reference symbols, without redundant description.

<First Embodiment> (1) Lath Shape The lath 1 shown in FIG. 1 has a long side 1829 (mm) and a short side 914.
The humps 1a, 1a having a height of 10 (mm) are formed on one surface of a rectangular flat wire mesh of (mm) in a scattered manner. As shown in FIGS. 2 and 3, the lath 1 is fastened to the outer wall underlaying plate 3 by placing a fastener such as a tucker needle or a claw nail inside the hump 1a and embedded in the mortar 4. In this state, the outer structure is partly formed. At this time, the hump 1a is parallel to the flat wire netting region (the part other than the hump 1a) occupying most of the lath 1 at a constant interval from the outer wall subbing plate 3 (ideally at the middle of the coating thickness of the mortar 4). Plays a supporting role in.

Since the lath 1 has a shape close to a flat lath, when the lath density is constant, the actual surface area is smaller than that of the corrugated lath, and the wire cross section is large. Therefore, the lath 1 is unlikely to sink due to the trowel pressure when the mortar 4 is applied, so that the coating thickness of the mortar 4 can be easily secured. Further, since the trowel pressure can be applied to the back side of the lath 1 so that the mortar 4 firmly wraps around it, nests are unlikely to occur in the mortar 4. Furthermore, since the surface of the lath 1 has almost no unevenness, it does not require much trowel pressure when applying the mortar 4, and the workability is good.

(2) Size of Lath Grains From the viewpoint of firmly adhering the lath 1 and the mortar 4 in order to suppress the occurrence of cracks in the mortar 4 and making it difficult for the lath 1 to sink, the smaller the lath size is, the more advantageous it is. . However, if the laths are made too fine, it becomes difficult for the mortar 4 to wrap around the back side of the laths 1, and cavities will form. This means more than one lath 1,
This is remarkable in the connecting portion where 1, ... Overlap (see FIG. 6). So, when the inventor repeated the construction experiment,
If the diagonal dimension of the lath is longer than R = 24 (mm) and shorter than S = 12 (mm) (see FIG. 1), it is on the back side of the connecting part where the three laths 1, 1, 1 overlap. Also, it was confirmed that the mortar 4 fully wraps around.

Although only the lower limit of the size of the lath is shown here, the coarser the lath is, the better it is not. This is because if the lath is too coarse, the lath 1 is likely to sink as described above, and the adhesion between the lath 1 and the mortar 4 is reduced. However, since the size of the lath correlates with the cross section of the wire rod and the lath density as described later, the upper limit value is substantially defined by these elements.

By the way, the size of the lath is defined by the diagonal dimension of the lath in the normal-temperature drawing cutting method, which is the main method for producing lath 1, after the notch is made at regular intervals in the original plate and then the notch is formed. This is because the shape of the lath will necessarily be a rhombus because it will be stretched in the direction orthogonal to.

(3) Lath wire cross section, lath density The wire cross section and lath density of lath 1 are, of course, important factors for determining the easiness of bending (hardness of sinking) of lath 1. Here, as shown in FIG. 4 (a), a notch of feed (notch pitch) p is made in the original plate having a plate thickness t by a room temperature stretch cutting method, and the original plate is formed in a direction orthogonal to the notch as shown in FIG. 4 (b). When stretched, the final lath 1 is obtained as shown in FIG. 4 (c).
The cross section of the wire has a width of t and a width of p. Then, the material of the original plate, the width t and the width p of the wire rod cross section, and the distance u between the wire rods.
If is decided, the lath density is decided. Conversely, if the material of the original plate, the width t and the width p of the wire rod cross section, and the lath density are determined, the interval u between the wire rods is determined, and the size of the lath can be derived in combination with the length of the notch. That is, there are correlations among five factors such as the size of the lath, the material of the original plate, the width of the wire (the thickness of the original plate) t, the cause of the wire (feed of the original plate) p, and the lath density. If four are decided, the other one is automatically decided. As a result, it was confirmed that an ideal lath was obtained when the lath density was 0.7 to 1.2 (kg / m ² ).

Here, when the original plate is a cold rolled steel plate and the diagonal dimension of the lath is 26 (mm) on the long side and 13 (mm) on the short side, the plate thickness t of the original plate, feed (pitch pitch) p, Table 1 illustrates the relationship between lath densities. The plate thickness t of the original plate here
In consideration of the reality, there are three types of 0.6, 0.7, and 0.8 (mm), but can be arbitrarily set within the range of 0.6 to 0.9 (mm).

[0040]

[Table 1]

By the way, if the width p and the width t are extremely different from each other, the lath 1 will be rounded during the manufacturing process. From this viewpoint, it is desirable that the wire cross section is close to a square. Also, the workability of cutting lath on site depends on the cross section of the wire, and if the wire cross section is too large, it will not be possible to cut the lath with versatile gold scissors.
Because of the wire rod, p cannot be so large.

(4) Number of humps In order to suppress the occurrence of cracks in the mortar 4 due to the behavior of the outer wall subbing plate 3, the smaller the number of contact points between the lath 1 and the outer wall subbing plate 3, that is, the unit projected area of the lath 1. Hump around
It is advantageous to reduce the number of a, but it is too bumpy 1
In order to prevent the sinking of lath 1 by reducing the number of a,
It is necessary to increase the wire cross section (t, p) or increase the lath density. That is, if the flat wire mesh area of the lath 1 is compared to a beam, the distance between the humps 1a and 1a corresponds to the distance between the fulcrums of the beam, and if the number of the humps 1a is reduced (the distance between the fulcrums is increased If so, it is necessary to increase the flexural rigidity of the flat wire mesh area (to increase the flexural rigidity of the beam) in order to prevent the flat wire mesh area from sinking too much. If it is increased, the workability of cutting the lath 1 and the workability of bending at the corner portion (see FIG. 12B) are deteriorated, and the cost is increased.

From this point of view, here, as shown in FIG. 5, the lath 1 having the long side 1829 (mm) and the short side 914 (mm) is used.
At a pitch of 150 (mm) in total, 91
Forming (pieces) humps 1a, 1a, ...
The upper limit of the number of a was set (55 (pieces / m ² )). This is because if the humps 1a are formed more densely than this, the number of contacts between the lath 1 and the outer wall under tension plate 3 becomes too large, which is not desirable for suppressing the occurrence of cracks in the mortar 4.

On the contrary, if the lath 1 does not sink by the normal ironing pressure when applying the mortar 4, the hump 1a
The smaller the number, the better. The inventor conducted an experiment in which the number of humps 1a was variously set, and Table 1
Under the lath specifications shown in, the number of humps is 15 (pieces / m ² ).
In the above case, it was confirmed that the problematic sinking of the lath 1 did not occur. The arrangement form of the humps 1a can be appropriately determined, and may be a zigzag arrangement other than the lattice arrangement shown in FIG.

(5) Planar size of the hump Since the hump 1a is the contact point between the lath 1 and the outer wall subbing plate 3, if the contact area is reduced, the lath 1 will behave as the outer wall subbing plate 3. While becoming difficult, the strength of the hump 1a itself becomes small. Therefore, the planar size of the hump 1a must be determined in a well-balanced manner, and here, as shown in FIG. 7, the hump 1a is formed by recessing four laths afterwards. Of course, the present invention is not limited to this, and for example, nine gauze patterns may be recessed to form the hump 1a.

(6) Height of the hump The height of the hump 1a determines the installation position of the flat wire netting region of the lath 1, and therefore is an extremely important factor in considering the occurrence of cracks in the mortar 4. As described above, in order for the lath 1 to effectively reinforce the mortar 4, it is ideal to position the center of gravity of the lath 1 at the middle position of the coating thickness of the mortar 4. Therefore, here, the height of the hump 1a is set to 10 mm, aiming for the flat wire mesh region of the lath 1 to be positioned at the middle of the mortar coating thickness set to 20 mm, but of course it is not limited to this. However, the height of the hump 1a is appropriately changed depending on the coating thickness of the mortar 4.

(7) Distinguishing display of hump When the lath 1 is fastened to the outer wall underlaying plate 3 at the site, it is supposed that the prescribed fastening pitch is assumed while working with the number of laths. Actually, since the eyes of the worker flicker due to the laths running in the vertical and horizontal directions, it is rare that work is performed at an accurate fastening pitch. However, as described above, the fastening pitch of the lath 1 has a great influence on the occurrence of cracks in the mortar 4, and therefore the work is originally required to be highly accurate. Therefore, here is the hump 1a, 1
By applying red paint to a, ..., and making it easy to visually identify the position of the hump 1a when it is laid on the waterproof paper 2 '(usually black color) , The accuracy and ease of fastening the lath 1 are ensured. Of course, the identification display of the hump 1a is not limited to this, and when the hump 1a is overlaid on the waterproof paper 2 '.
Any means can be used as long as it can be easily identified visually.

It is desirable to use a rust preventive paint as the colored paint for the hump 1a. This is because the hump 1a is not completely embedded in the mortar 4 unlike the flat wire mesh region, and is placed in an environment where it easily rusts even after construction. When the hump 1a is rusted, rust progresses from here to the flat wire mesh region and causes neutralization of the mortar 4, so that the lath mortar structure is adversely affected.

(8) Connecting portion between laths When fastening a plurality of laths 1, 1, ... To the outer wall underlaying plate 3, as shown in FIG. As the parts are stacked, the lower ends of the upper laths 1, 1, ... Are stacked in a staggered manner on the upper ends of the lower laths 1, 1 ,. At this time, if the humps 1a, 1a, ... Are piled up, the hump 1a is less likely to be crushed due to the trowel pressure, etc., and the flat wire mesh region occupying most of the lath 1 is reliably held at the middle coating thickness of the mortar 4. To be done. Also, the bumps 1a, 1a, ...
If the layers are stacked, the work of positioning and connecting the lath 1 becomes easy and the workability is improved.

(9) Tucker needle for fastening the fastening tool lath 1 to the outer wall subbing plate 3,
The fasteners such as crotch nails are provided with a distinctive display. For example, in the shoulder portion of the tucker needle 5 surrounded by the dotted line in FIG. 7, yellow paint (of course, rust preventive is desirable) is applied. Thus, the hump 1a of lath 1 (red)
And the waterproof paper 2 '(black) have different color tones, it is possible to easily visually distinguish between the area where the tucker needle 5 has already been placed and the area where the tucker needle 5 has not yet been placed. , Workability and quality are improved. Of course, the distinctiveness display of the fastening device is not limited to this, and the color tone / pattern or the like different from that of the waterproof paper 2 ′ or the hump 1a is attached to part or all of the fastening device. It suffices if the presence or absence of the fastener can be easily visually identified even when it overlaps with the waterproof paper 2 ′ or the hump 1a. Also, as a measure to prevent the progress of rust, the material of the fastener is made of SUS (stainless steel), or the fastener is subjected to rust-prevention treatment (painting). It is desirable to ensure the durability of the lath mortar structure by increasing the material diameter.

<Second Embodiment> FIG. 8 is a partially cutaway perspective view showing a second embodiment of the exterior structure according to the present invention. The exterior structure shown in the figure is the waterproof paper 2'of the first embodiment.
Is replaced with a special waterproof surface material 2. The waterproof surface material 2 includes an asphalt compound layer 2b and is provided with an uneven surface 2e formed by a large number of projections 2d, 2d, ... Below, waterproof surface material 2
I will describe.

(1) Basic function The basic function of the waterproof surface material 2 is roughly classified into three. The first function is a function as a waterproof material that prevents rainwater and water in the mortar 4 that have entered the outer wall from the outside from penetrating to the outer wall underlaying plate 3 side, and the asphalt compound layer 2b takes this role. . In addition, the second function is to secure a ventilation space for releasing the moisture that has entered the inside of the outer wall from the outside, the moisture in the mortar 4, or the moisture in the room that has entered the inside of the outer wall from the defective portion of the vapor barrier 6 to the outside. The uneven surface 2e bears this. The third function is to maintain the waterproof performance by fixing the lath 1 to the outer wall underlaying plate 3 with a tacker such as a tucker needle or a claw nail, thereby repairing the hole in the waterproof surface material 2 by itself. The asphalt compound layer 2b bears this. And in the present invention,
"Increase in the number of holes in the waterproof surface material"->"Abrasion due to moisture absorption of the outer wall underlaying board" → "Waterproofing surface material 2 for the purpose of preventing a vicious cycle of mortar cracking due to the behavior of the outer wall underlay board" Since it is adopted, the first and third functions are particularly important.

(2) Constitutional pattern As the layer constitution of the waterproof surface material 2, there are four patterns as shown in FIG. The waterproof surface material 2A shown in FIG.
It has a three-layer structure in which a base layer 2a, an asphalt compound layer 2b, and a surface layer 2c are laminated in order from the outdoor side, and an uneven surface 2e is formed by a large number of projections 2d, 2d, ... Scattered on the indoor side of the surface layer 2c. There is. The waterproof surface material 2B shown in FIG. 9B has a two-layer structure in which a base layer 2a and an asphalt compound layer 2b are laminated in this order from the outdoor side,
An uneven surface 2e is formed by a large number of projections 2d, 2d, ... Scattered on the indoor side of the asphalt compound layer 2b. The waterproof surface material 2C shown in FIG. 9C has a two-layer structure in which an asphalt compound layer 2b and a surface layer 2c are laminated in this order from the outdoor side, and a large number of protrusions 2d, 2d scattered on the indoor side of the surface layer 2c. The uneven surface 2e is formed by. The waterproof surface material 2D shown in FIG. 9D has a single-layer structure including only the asphalt compound layer 2b, and the uneven surface 2e is formed by a large number of projections 2d, 2d, ... Scattered on the indoor side of the asphalt compound layer 2b. Has been formed.

(3) Asphalt compound layer Here, the asphalt compound layer 2b is a layer made of asphalt compound having cold flow property and viscoelasticity such as asphalt or rubber-modified asphalt, and as described above, from the outside to the inside of the outer wall. It mainly has a function as a waterproof material for preventing rainwater that has entered and water in the mortar 4 from permeating into the outer wall underboard 3 side.

Then, the asphalt compound layer 2b
Has a cold flow property and viscoelasticity, and as a result, also has a function (nail hole sealing function) of closing and opening the hole vacated by a fastener for fastening the lath 1 to the outer wall underlaying plate 3. Therefore, the waterproof function of the waterproof surface material 2 is not impaired by the fastener. From such a viewpoint, each of the waterproof surface materials 2A to 2D is configured to include the asphalt compound layer 2b.

(4) Concavo-convex surface The waterproof surface material 2A shown in FIG. 9 (a) and the waterproof surface material 2C shown in FIG. 9 (c) are formed by embossing paper or film with a predetermined unevenness. The protrusions 2d, 2d, ... Are raised to form the uneven surface 2e, and the surface layer 2c is bonded to the asphalt compound layer 2b. Here, the uneven surface 2e of the surface layer 2c may be formed by arranging a large number of protrusions 2d, 2d, ... Made of resin, rubber or the like on paper or film in a standing manner. Further, the waterproof surface material 2B shown in FIG. 9 (b) and the waterproof surface material 2D shown in FIG. 9 (d) have a large number of protrusions 2d, 2d, by embossing the indoor surface of the asphalt compound layer 2b itself. Is raised to form the uneven surface 2e.

In any case, since the uneven surface 2e has a function of ensuring a ventilation space on the indoor side of the waterproof surface material 2 by the gaps between the large number of projections 2d, 2d, ... Each of the 2D has a structure having an uneven surface 2e. Here, the arrangement form of the protrusions 2d, 2d, ... Can be set freely at all, but an arrangement having no directionality is preferable in consideration of the ventilation direction. The height of the protrusion 2d (height difference of the uneven surface 2e) is preferably 1 mm or more. Protrusion 2 from this
This is because if the height of d is small, the gap between the projections 2d, 2d, ... Is too narrow to function as a ventilation space. More desirable height of the protrusion 2d is 2 to 10 mm. This is because if the height of the protrusion 2d is larger than 10 mm, the general-purpose tucker needle cannot be used. Further, among them, the particularly desirable height of the protrusion 2d is 2
~ 4 mm. This is because if the height of the protrusions 2d is set to 4 mm or less, the waterproof surface material 2 can be carried into a site in the form of a roll like conventional waterproof paper and can be installed as usual.

(5) Base layer The base layer 2a is not a highly hygroscopic rug base paper made of waste paper, cotton, and dust like the waterproof paper portion of conventional waterproof paper and lath nets with waterproof paper, but is a synthetic fiber that hardly absorbs moisture. (For example, polyester-based, polyethylene-based, polypropylene-based) non-woven fabric, glass fiber woven fabric or non-woven fabric, or woven fabric or non-woven fabric obtained by mixing these.

This base layer 2a is not essential for the waterproof surface material 2, but in the case shown in FIGS. 9 (a) and 9 (b), it serves as a base surface for forming the asphalt compound layer 2b by coating. The waterproof surface materials 2A and 2B having such a base layer 2a are arranged with the base layer 2a facing the outdoor side, but since the base layer 2a is made of a non-hygroscopic fiber,
It hardly absorbs rainwater or water in the mortar 4 during construction, and does not cause cracks. Therefore, the cause of cracks in the mortar 4 after curing due to the imbalance of the coating thickness can be eliminated as much as possible. 9 (c) and 9 (d) without the base layer 2a.
In the case of, since the asphalt compound itself is a non-hygroscopic material, the same effect can be obtained.

<Storing of Extruded Corner> If the lath 1 described above is applied to the projected corner as it is, cracks are likely to occur in the mortar 4 at the relevant portion, and workability is poor. That is, as shown in FIG.
When applying the mortar 4 to the projecting corners by pressing the end portion near the projecting corners against the outer wall underlaying plate 3 and applying the mortar 4 to the projecting corners, first mortar up to the surface positions of laths 1 and 1 (indicated by dotted lines in the figure) 4 (Fig. 10 (b)),
Next, the guide ruler 7 is installed so that the guide portion 7a is fitted to the projected corner of the undercoated mortar 4 (the same (c)), and finally the finishing mortar 4 is applied with the tip 7b of the guide ruler 7 as a target. (Same as (d)).

However, in such a method, since there is no ruler at the projected corner in the undercoating step of the mortar 4, the undercoating cannot be properly performed up to the dotted line position (see FIG. 1).
0 (b)), as a result, the installation position of the guide ruler 7 is displaced (see (c)), and the coating thickness of the mortar 4 tends to be inaccurate (see (d)). Has many problems. In addition, since there is no lath 1 in the middle portion of the coating thickness of the mortar 4 at the projected corner and the mortar 4 is not sufficiently reinforced, there is a problem that the mortar 4 is easily cracked at this portion. Further, since the guide ruler 7 having poor adhesion to the mortar 4 is embedded in the mortar 4, there is a problem that the mortar 4 is easily cracked on both sides of the tip 7b of the guide ruler 7 (see FIG. 10 (d)).

Such a problem is solved by using a long corner ruler 8 as shown in FIG. 11 (a). The corner ruler 8 includes two side corner mounting portions 8a fixed along the outside-side protruding corner portion of the outer wall underlining plate 3,
8a and a lath support portion 8b that bisects an outer angle formed by the corner mounting portions 8a and 8a have a three-pronged cross section.

The lath support portion 8b has an appropriate bending strength. This is the lath support 8 as shown in FIG.
This is for bending the lath 1 with the tip of b as a ruler.
Further, the lath support portion 8b has mortar insertion holes 8c and 8c.
c, ... Are drilled. This is because when a foreign material is embedded in the mortar 4, the mortar 4 is easily cracked at the relevant portion, so by increasing the open degree of the lath support portion 8b, the mortar 4 is prevented from cracking at the projected corner portion. It is provided. The mortar insertion hole 8
The shape of c is not limited to this. For example, FIG.
1 (b), (c) may be used.

Next, a method of using the corner ruler 8 will be described. First, the corner mounting portions 8a, 8a of the corner ruler 8
Is fixed with a tucker needle or the like along the outside-side protruding corner of the outer wall subbing plate 3 (see FIG. 12 (a)), and then the lath 1 is bent at a right angle with the tip of the lath supporting portion 8b as a ruler, The lath 1 is fastened around the corner (the same (b)), the undercoat of the mortar 4 (the same (c)) and the finish coating (the same (d)) are performed. At this time, since the length of the lath support portion 8b is about 2 ^1/2 of the height of the hump 1a of the lath 1, the flat metal wire mesh region of the lath 1 also has an outer wall lower stretch plate even in the vicinity of the projected corner. It is fastened while keeping parallel to 3, and the lath 1 is securely held in the middle of the coating thickness of the mortar 4 even in the projected corner portion. Therefore, the base coating of the mortar 4 is facilitated, and the finish coating of the mortar 4 can be accurately performed.
It is unlikely that the total coating thickness is insufficient. Further, the mortar 4 at the projected corner is sufficiently reinforced with the lath 1 and the lath support portion 8 is provided by the mortar insertion hole 8c.
Since the openness of b is increased, mortar 4
Is hard to crack.

There is also a solution using a corner lath 9 formed by bending a flat lath into a substantially Ω-shaped cross section as shown in FIG. That is, first, as shown in FIG. 14A, the corner laths 9 are fastened to the corners of the outer wall underlaying plate 3, and then the corners 9 of the laths 1 and 1 are overlapped with the corner laths 9. Then, they are respectively fastened to the outer wall subbing plate 3 (FIG. 14B), and the mortar 4 is undercoated (same (c)) and finished (same (d)). Also in this case, since the corner lath 9 is changed to a ruler and the undercoating of the mortar 4 is facilitated even at the projected corner portion, the finishing coating of the mortar 4 can be accurately performed, and as a result, the mortar 4 is finished.
It is unlikely that the total coating thickness is insufficient. Further, since the mortar 4 at the projected corner is sufficiently reinforced by the corner lath 9 and the guide ruler 7 having poor adhesion with the mortar 4 is not used, the mortar 4 is hard to be broken at the projected corner.

[0066]

According to the invention according to claim 1 or 4, the mortar coating thickness is unlikely to be insufficient, the occurrence of cracks in the mortar can be suppressed, and the lath is less likely to rust, so the quality of lath mortar construction is improved. . Further, since the trowel pressure required when applying the mortar is not required so much, the workability is also good. In addition, it is possible to realize laths with good adhesion to mortar at low cost because it is difficult to bend due to iron pressure while keeping the number of humps as low as possible, and can be cut with gold scissors usually used in the field. it can.

According to the inventions according to claims 2 to 4, the hump portion is particularly resistant to rust and it is possible to effectively prevent the lath from rusting and neutralizing the mortar, so that the quality of the lath mortar construction is improved. Further improve.

According to the fifth aspect of the present invention, it is possible to suppress the occurrence of cracks in the mortar due to the cracking of the outer wall subbing plate, and the waterproof function of the waterproof surface material is not impaired.

According to the sixth aspect of the present invention, in particular, the waterproof surface material does not absorb rainwater during construction or water in the mortar to cause cracks, and cracks caused by an imbalance in coating thickness of the mortar. Can be suppressed.

According to the seventh aspect of the present invention, the hump is not crushed by the trowel pressure and the like, and the lath is reliably held in the middle of the mortar coating thickness, so that the quality is improved. Also,
By stacking the humps on each other, it is possible to easily connect two or more laths and improve workability.

According to the eighth aspect of the invention, it is possible to easily visually distinguish between the range in which the fasteners have already been placed and the range in which the fasteners have not yet been placed, and the quality and workability can be improved. Is improved.

According to the invention of claim 9, the quality and workability are improved because the lath is surely held in the middle of the mortar coating thickness even in the projected corner portion.

According to the tenth aspect of the present invention, it is possible to suppress the occurrence of cracks (bare cracks) in the mortar at the corners, even though foreign members are embedded in the mortar.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a lath according to the present invention.

FIG. 2 is a partially cutaway perspective view showing a first embodiment of an exterior structure according to the present invention.

FIG. 3 is an enlarged vertical sectional view of the same portion.

FIG. 4 is an explanatory diagram of a lath manufacturing method by a room temperature stretch cutting method.

FIG. 5 is a plan view for explaining the arrangement and number of humps.

FIG. 6 is a partial elevational view showing a connecting portion between laths.

FIG. 7 is a perspective view of a tucker needle.

FIG. 8 is a partially cutaway perspective view showing a second embodiment of the exterior structure according to the present invention.

9 is a sectional perspective view showing a configuration pattern of the waterproof surface material shown in FIG.

FIG. 10 is a transverse cross-sectional view for explaining a problem when the lath shown in FIG. 1 is applied to the projected corner as it is.

FIG. 11A is a perspective view of a corner ruler,
(B), (c) is a partial side view which shows the example of arrangement | positioning of a mortar insertion hole.

12 is a transverse cross-sectional view showing a method of accommodating a projected corner portion using the corner ruler shown in FIG.

FIG. 13 is a perspective view of a corner lath.

FIG. 14 is a transverse cross-sectional view showing a method of accommodating a projected corner portion using the corner lath shown in FIG.

FIG. 15 is a perspective view showing a conventional corrugated lath.

16 is a partially cutaway perspective view showing a conventional exterior structure using the corrugated lath shown in FIG.

FIG. 17 is a partially enlarged vertical sectional view for explaining a problem in the conventional exterior structure shown in FIG.

[Explanation of symbols]

1 ... Ruth 1a ... hump 1 '... Wave lath 2, 2A-2D ... Waterproof surface material 2a ... Base layer 2b ... Asphalt compound layer 2c ... Surface layer 2d ... Protrusion 2e ... Uneven surface 2 '... waterproof paper 3 ... Outer wall underboard 4… Mortar 5 ... Tucker needle 6 ... Vapor barrier 7… Guide ruler 7a ... Guide part 7b ... Tip 8… Corner ruler 8a ... Corner mounting part 8b ... Las support part 8c ... Mortar insertion hole 9 ... Corner lath A ... Mountain B ... Valley

Claims (10)

[Claims] 1. A flat wire gauze is provided with humps having a certain height on one side thereof, which are manufactured by a room temperature stretch cutting method, and are provided with the following conditions (1) to (5). Ruth. (1) The diagonal dimension of the lath is longer than 24 (mm) and shorter side 1
2 (mm) or more (2) Original plate thickness is 0.6 to 0.9 (mm) (3) Original plate feed (step pitch) is 0.73 to 1.24
(Mm) (4) Lass density is 0.7 to 1.2 (kg / m ² ) (5) Number of humps is 15 to 55 (pieces / m ² ). 2. The lath according to claim 1, wherein the hump is rust-proofed. 3. A lath characterized in that humps having a constant height are formed on one surface of a flat wire mesh in a scattered manner, and the hump is subjected to rust prevention treatment. 4. The waterproof surface material attached to the outdoor side of the outer wall subbing board, and the outdoor side of the waterproof surface material being fastened to the outer wall subbing board. An exterior structure comprising: the lath according to one item; and a mortar including the lath and applied to the outdoor side of the waterproof surface material. 5. The exterior structure according to claim 4, wherein the waterproof surface material includes an asphalt compound layer and is provided with an uneven surface formed by scattering a large number of projections on the indoor side. 6. The exterior structure according to claim 5, wherein the waterproof surface material is provided with a base layer made of non-hygroscopic fiber on the outdoor side. 7. The lath according to claim 4, wherein two or more laths are connected so that the hump of one lath and the hump of another lath overlap each other. Exterior structure. 8. The identification tool is attached to a fastener for fastening the lath to the outer wall subbing plate, and the fastener is attached to the fastening tool. Exterior structure. 9. An exterior structure in which the lath is fastened to the outer wall subbing plate via a long corner ruler fixed to an outside corner of the outer wall subbing plate, the corner ruler comprising: , Supporting the protruding corner of the lath by bisecting the two-corner mounting part fixed along the outside-side protruding corner of the outer wall underlaying plate and the outer angle formed by these two corner mounting parts The exterior structure according to any one of claims 4 to 8, wherein the outer structure has a trifurcated shape in cross section with the lath support portion. 10. The exterior structure according to claim 9, wherein a mortar insertion hole is formed in the lath support portion.