JP2018165433A - Lath for exterior wall ventilation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of mortar coating work by optimizing the shape of a lath net and increasing the out-of-plane rigidity in a well-balanced manner without changing the weight as compared with a conventional product, and by extension, high strength, high rigidity and high height. To provide an outer wall ventilation method lath that can construct a quality mortar outer wall. SOLUTION: This is a lath 10 for an outer wall ventilation method in which a lath 1 formed of a lath net 1 is lined with a backing material 2, and the lath net 1 has an upper flange 11 and a lower flange 12 webbed in a vertical direction. It is bent and formed into a trapezoidal wave shape that is alternately connected via 13. [Selection diagram] Fig. 2

Description

  The present invention belongs to the technical field of a lath for an outer wall ventilation method, which is formed by lining a lath formed of a lath mesh with a backing material, and is fastened to a ventilation drum edge to construct an outer wall ventilation structure of a building.

In the construction of the outer wall structure of a building, in recent years, in order to solve the problem of moisture and condensation such as rainwater and moisture, as shown in FIG. 16, between the base material (for example, the base plywood) a and the mortar outer wall b, A mortar-coated outer wall ventilation method in which a ventilation layer d is formed by interposing a ventilation cylinder edge c is often used.
In this outer wall ventilation method, a lath g for outer wall ventilation method in which a backing material (mainly waterproof paper) f is lined and integrated with a lath e used to construct the mortar outer wall b is often used.
The ventilator edge c is usually attached to a pillar h standing upright at a pitch of about 455 mm via the base material a, but the lath for the outer wall ventilation method due to the pressing force or the like when applying the mortar b ′ In order to prevent the deflection of g (the lath e and the backing material f), it is common to arrange an auxiliary trunk edge i made of wood or a resin material in addition to the ventilation trunk edge c. In general, one (or a plurality) of auxiliary cylinder edges i are arranged in a balanced manner between the ventilation cylinder edges c.

  By the way, if the out-of-plane rigidity of the lath g for the outer wall ventilation method can be increased without increasing its weight, the deflection of the lath g (the lath e or the backing material f) can be moderately suppressed. It is clear that the workability is improved and it is possible to contribute to the construction of a higher quality mortar outer wall b.

  In order to increase the out-of-plane rigidity of the lath for the outer wall ventilation method, it is considered that the wire material (wire diameter of about 0.8 mm) constituting the lath is replaced with a thicker bone (wire diameter of 1.6 mm or more) than the conventional product. It is done. However, with this means, the weight of the lath is remarkably increased, so that it is difficult to handle and burdens the operator. Although the increase in the weight of the lath can be prevented by disposing the ribs at a distance from that of the conventional product, the density of the lath net is lowered, so the workability of the mortar coating work may be deteriorated and the quality of the outer wall of the mortar may be deteriorated. In addition, if the wire diameter exceeds 1.6 mm, it is difficult to cut the lath by hand, and it is also important to note that it is difficult to attach the lath to an opening or the like that needs to be aligned on the spot.

For example, Patent Literature 1 includes two documents of expanded metal and composite lath that have been devised in the form as prior art, and pointed out the respective problems, and the outer wall ventilation with increased rigidity (out-of-plane rigidity) Inventions relating to laths for construction methods are disclosed.
The characteristics (configuration and effect) of the invention described in Patent Document 1 are listed as follows.
・ Because the lath wire (expanded metal) wire that forms the mesh of the joint to be bonded to the waterproof sheet is formed larger in width than the wire that forms the mesh of the curved portion, the rigidity of the joint Becomes larger.
-Therefore, since a waterproof sheet can be supported by a joint part with large rigidity, the support force of a waterproof sheet improves and it becomes difficult to bend.
-Also, since the rigidity of the curved portion is increased by the arch action, it is possible to maintain a state separated from the waterproof sheet without increasing the width of the wire constituting the curved portion mesh, and the weight of the lath material Can be reduced.

JP 2012-97521 A

According to the lath for the outer wall ventilation method according to Patent Document 1, the out-of-plane rigidity of the joint portion between the waterproof sheet and the lath material is certainly increased, but the lath weight is increased too much because it is biased to improve the rigidity of the joint portion. As a result, the rigidity of the lath material itself has been reduced, and the balance of stiffening is lacking.
That is, the lath for the outer wall ventilation method compares all the wires in the range of the joint portion 32 (see FIG. 3 of the same document 1) formed in a mesh shape with the wires of the other curved portions 31, and has a thickness of 2 About 5 times (see Fig. 4). Even though this is an excessive stiffening design, the lath weight is remarkably increased, and therefore, the portions other than the joint portion 32 are not stiffened at all. As a measure of bitterness, the arch effect is merely expected by forming it in a curved shape.

However, when the lath material (expanded metal) is formed in a curved shape without any reinforcement, the stiffening by the arch effect is not sufficient. This is also clear from the analysis results by the applicant.
That is, the yield strength (section modulus) of the curved portion 31 formed in the arch shape does not increase so much, and thus it cannot be said that the bending portion 31 has rigidity capable of resisting the pressing force during the mortar coating operation. In combination with the high rigidity, the curved portion 31 may be crushed or deformed.
Therefore, the stable mortar coating operation cannot be performed, and there is a possibility that the workability is deteriorated and the quality of the outer wall of the mortar is deteriorated. Further, since the rigidity (shape retention) of the curved portion 31 cannot be said to be sufficient, there is a problem that it is bothersome and troublesome during transportation and handling. Of course, there is also a problem of bulkiness during transportation.

The present invention has been devised in view of the above-mentioned problems of the background art, and the object is to optimize the shape of the lath net with almost no change in weight compared to conventional products. The object is to provide a lath for an outer wall ventilation method that can increase the out-of-plane rigidity in a balanced manner, improve the workability of mortar coating work, and can build a high-strength, high-rigidity, high-quality mortar outer wall.
Specifically, to provide a lath for outer wall ventilation method that optimizes the shape of the lath net and improves out-of-plane rigidity in a balanced manner, resulting in a longer span of the trunk edge, in other words, the use of the auxiliary trunk edge. It is in.

  As means for solving the above-mentioned background art, the lath for outer wall ventilation method according to the invention described in claim 1 is an outer wall aeration method lath formed by lining a lath formed of a lath net with a backing material. Each of the lath nets is characterized by being bent and formed into a trapezoidal wave shape in which an upper flange and a lower flange are alternately connected via a web in the longitudinal direction.

  The invention described in claim 2 is characterized in that in the lath for outer wall ventilation method according to claim 1, the width dimension of the upper flange of the lath net is equal to or greater than the width dimension of the lower flange. To do.

  The invention described in claim 3 is the lath for the outer wall ventilation method according to claim 1 or 2, wherein the width of the upper flange of the lath net is about 30 to 40 mm.

  According to a fourth aspect of the present invention, in the lath for an outer wall ventilation method according to any one of the first to third aspects, an inclination angle of the web with respect to an extension line of a lower flange of the lath net is about 45 to 75 degrees. It is characterized by being.

  The invention described in claim 5 is the lath for outer wall ventilation method according to any one of claims 1 to 4, wherein the height difference between the upper flange and the lower flange of the lath net is about 5 to 8 mm. It is characterized by.

The lath for an outer wall ventilation method according to the present invention has the following effects.
(1) Since the lath net is bent and formed into a trapezoidal wave shape in which an upper flange and a lower flange are alternately connected via a web, a lower flange for obtaining a stable reaction force against an out-of-plane load And an extremely rational lath for the outer wall ventilation method with a small number of members, which has both an upper flange for securing a good mortar coating thickness, can be realized.
In addition, the lath for the outer wall ventilation method with excellent out-of-plane rigidity can be realized by adopting a configuration in which the occupation ratio between the upper flange and the lower flange is balanced and has a good balance.
(2) Since the web has an inclination angle (wave angle) of about 45 to 75 degrees, it is possible to realize a lath for an outer wall ventilation method with high out-of-plane rigidity without substantially increasing the weight.
(3) Since the height difference between the upper flange and the lower flange of the lath net is set to about 5 to 8 mm, an outer wall ventilation method lath capable of constructing a good mortar coating thickness and eventually a high quality mortar outer wall. Can be realized.
(4) In summary, according to the lath for external wall ventilation method according to the present invention, the shape of the lath net is optimized and the mortar layer is reinforced and stiffened by changing the shape of the lath net almost without changing the weight. The entire lath net (whole surface) that has been subjected to the corrugation process effectively contributes to the function to improve the out-of-plane rigidity in a well-balanced manner, improving the workability of the mortar coating work, and consequently high strength, high rigidity, and high Can build quality mortar outer wall.
Specifically, as a result of optimizing the shape of the lath net and increasing the out-of-plane rigidity in a well-balanced manner, it is possible to achieve a long span of the trunk edge, in other words, an unnecessary use of the auxiliary trunk edge.

A is a front view schematically showing a part (upper left part) of a lath for an outer wall ventilation method according to the first embodiment, and B is a plan view showing a state in which the lath is attached to a ventilation trunk edge. , C are right side views of A. A is a partially enlarged view of FIG. 1A, and B is a right side view of A. FIG. A is a right side view showing a lath for an outer wall ventilation method in which a backing material is fastened to a lower flange of a lath net, and B is a right side view showing a state in which the lath is attached to a ventilation cylinder edge. . A is a right side view showing a lath for an outer wall ventilation method in which a backing material is fastened to an upper flange of a lath net, and B is a right side view showing a state in which the lath is attached to a ventilation cylinder edge. . It is explanatory drawing which showed the difference of the cross-sectional secondary moment and unit weight by the angle (wave angle) of a wave. It is the perspective view which showed the range of modeling used for analysis of out-of-plane rigidity. It is the schematic which showed the boundary conditions (Y-axis direction arrow view). It is the schematic which showed the boundary conditions (X-axis direction arrow view). A is a schematic diagram showing a wave 2 model shape, B is a schematic diagram showing a wave 3 model shape, and C is a schematic diagram showing a wave 4 model shape. It is a list of analysis cases A to G (A1 to G1). Incidentally, there is no description of analysis case D. FIG. 11 illustrates the wave shapes of analysis cases A to C (A1 to C2) according to FIG. FIG. 11 illustrates the wave shapes of analysis cases E to G (E1 to G1) according to FIG. It is the graph which showed the load displacement relationship in analysis case A1. A is a list comparing the analysis values of analysis cases A to G (A1 to G1), and B is a performance comparison chart based on the list. A is an analysis model shape, and B is an explanatory diagram showing the basis for setting the width dimension of the upper flange of the lath net to about 30 to 40 mm based on the analysis model shape. It is the perspective view which showed the outer wall ventilation structure which concerns on a prior art.

  Next, embodiments of the lath for the outer wall ventilation method according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, the lath for an outer wall ventilation method according to the present invention is an outer wall ventilation method lath 10 formed by lining a backing material 2 on a lath 1 formed of a lath net 1, The net 1 is characterized in that an upper flange 11 and a lower flange 12 are bent and formed in a trapezoidal wave shape in which the upper flange 11 and the lower flange 12 are alternately connected via a web 13 in the vertical direction.

In short, the lath 10 for an outer wall ventilation method according to the present invention is formed by bending the lath net 1 into a corrugated trapezoidal wave shape as a main feature.
Usually, the lath 10 for outer wall ventilation method before construction of the mortar is in contact with only the trunk edge 21 and is fastened by staples (a U-shaped nail or a needle) using a tucker (staple gun) (not shown). The reaction force against the out-of-plane load during construction can be obtained only from the surface (or line) where the lath 10 and the trunk edge 21 are in contact. Therefore, a stable reaction force against any load can be obtained when the portion in contact with the trunk edge 21 has a sufficient length.
On the other hand, in order to ensure a good mortar coating thickness (thickness of about 15 mm), it is better that a member serving as a core material is disposed at the central portion (about 5 to 8 mm) in the thickness direction.
As a result of taking the above into consideration, the lath 10 for outer wall ventilation method according to the present invention has a lath net 1 that forms the main skeleton, a lower flange 12 for obtaining a stable reaction force against the out-of-plane load, and the good mortar. It was bent and formed into a corrugated trapezoidal wave shape so as to have an upper flange 11 for securing the coating thickness.
Further, if the length (occupancy ratio) of the upper flange 11 and the lower flange 12 is biased to any one, the neutral shaft is also biased in the same manner, leading to a decrease in the sectional moment (out-of-plane rigidity). It was bent into a trapezoidal wave shape with unevenness and good balance.

The outer wall ventilation method lath 10 according to the first embodiment is further characterized by the following configuration.
The width dimension (length) of the upper flange 11 of the lath net 1 is set to be equal to or greater than the width dimension (length) of the lower flange 12. Incidentally, the upper flange 11 according to the present embodiment is set to 40 mm, and the lower flange 12 is set to 24 mm.
The difference in height between the upper flange 11 and the lower flange 12 of the lath net 1 is about 5 to 8 mm, which is about half of the mortar coating thickness in order to ensure appropriate out-of-plane rigidity and good mortar coating thickness (thickness of about 15 mm). Is set to about.

In addition, the lath 10 for the outer wall ventilation method according to the first embodiment is configured such that the inclination angle (corrugation angle) of the web 13 with respect to the extension line of the lower flange 12 of the lath net 1 is about 60 degrees.
As shown in FIG. 5, when the corrugation angle is changed with the staple interval and the wave height being constant, the cross-sectional secondary moment gradually increases as the corrugation angle approaches 90 degrees. The outer rigidity also increases gradually. However, since the unit weight gradually increases, there is a problem in that the weight of the entire lath net 1 is increased, which imposes a burden on the operator and impairs handling and workability.
Therefore, the inventors of the present applicant analyzed the lath net 1 having high rigidity (out-of-plane rigidity) without increasing the weight based on the rigidity / weight. As a result, when the staple interval is 150 mm and the wave height is 5 to 8 mm, good results can be obtained when the corrugation angle is in the range of 45 to 75 degrees, among which the optimum is 60 to 75 degrees (near). It turns out to get a value.

Based on the above, in the lath net 1 according to the lath 10 for outer wall ventilation method according to the first embodiment, the length of the upper flange 11 is 40 mm pitch, the lower flange 12 is 24 mm pitch, and the corrugation angle of the web 13 is 60 degrees. The height difference between the upper flange 11 and the lower flange 12 is bent and formed into a wave shape of 7 (˜8) mm.
By the way, according to the analysis result (described later) conducted by the inventors of the present applicant, the length of the upper flange 11 is about 30 to 40 mm, and the corrugation angle is about 45 to 75 degrees. It has been found that the out-of-plane rigidity can be improved.

For the lath net 1, an expanded metal lath is used. The same applies to a welded wire mesh. The lath weight is preferably 800 to 900 g / mm ^{2 in} consideration of handling efficiency and workability as well as economy, strength and rigidity.

As shown in FIG. 1A, the backing material 2 is implemented in a configuration in which the backing material 2 is bonded together in a positional relationship slightly shifted upward and leftward from the center of the lath net 1. However, the backing material 2 may be implemented in an arrangement shifted from the center of the lath net 1 in any direction.
The backing material 2 is made of tarpaulin paper, moisture permeable waterproof paper, resin mesh sheet, non-woven sheet, etc., and is fastened to the lath net 1 with, for example, staples 3 or with an adhesive, hot melt or the like. And integrated configuration. Incidentally, as an example, the backing material 2 according to this embodiment is fastened to the lower flange 12 of the lath net 1 with the staples 3 as shown in FIG. In addition, as shown in FIG. 4, the lath net 1 may be fastened to the upper flange 11 with the staple 3.

The outer wall ventilation structure constructed using the outer wall ventilation method lath 10 having the above-described configuration is generally implemented by the following steps.
First of all, construction is proceeded in accordance with the procedure of building the pillars and studs that make up the building frame and constructing the wall insulation. And a base material is attached to the outer surface of the said pillar and a stud.
Next, the ventilator edge 21 is fastened to the base material (not shown) so as to correspond to the spacing between the studs (about 455 mm). As described above, the lath 10 for the outer wall ventilation method has a large out-of-plane rigidity, and a long span of the trunk edge can be expected sufficiently. Therefore, the auxiliary trunk edge 22 is not used.
Next, the lath 10 for the outer wall ventilation method is aligned with the ventilator rim 21 while maintaining the vertical position in which the corrugated bent portion is in the vertical direction, and is ventilated by a fixing tool such as a staple (not shown). The outer wall ventilation method lath 10 is fixedly attached to the trunk edge 21 and stretched.
This stretching operation is performed over the entire range necessary for the subsequent mortar coating operation, and in particular, the addition of the adjacent outer wall ventilation method laths 10 and 10 is performed so as not to cause a break (gap) in the lath net 1. Repeat in order, for example by overlapping a part.
After the operation of stretching the lath 10 for the outer wall ventilation method is completed, the mortar outer wall is constructed by performing mortar coating work on the surface side of the lath 10 stretched on the ventilator edge 21 with good workability. The upper flange 11 of the lath net 1 is disposed at the center in the thickness direction of the mortar layer thickness (about 15 mm). Thus, a space between the outer wall ventilation method lath 10 and the base material whose rear surface is blocked by the backing material 2 is formed as a ventilation layer.

According to the lath 10 for the outer wall ventilation method having the above-described configuration, the following effects can be obtained.
(1) Since the lath net 1 is bent and formed into a trapezoidal wave shape in which the upper flange 11 and the lower flange 12 are alternately connected via the web 13, a stable reaction force against the out-of-plane rigidity is obtained. An extremely rational outer wall ventilation method lath 10 having a small number of members and having the lower flange 12 for obtaining and the upper flange 11 for securing the good mortar coating thickness can be realized.
Moreover, the lath 10 for outer wall ventilation construction method which ensured the out-of-plane rigidity satisfactorily can be realized by adopting a configuration in which the occupation ratio between the upper flange 11 and the lower flange 12 is not biased and has a good balance.
(2) Since the inclination angle (wave corrugation angle) of the web 13 is about 60 degrees, it is possible to realize the lath 10 for the outer wall ventilation method that effectively increases the out-of-plane rigidity without increasing the weight. Can do.
(3) Since the height difference between the upper flange 11 and the lower flange 12 of the lath net 1 is set to about 5 to 8 mm, an outer wall ventilation method capable of constructing a good mortar coating thickness and eventually a high quality mortar outer wall. The lath 10 can be realized.
(4) In summary, according to the lath 10 for outer wall ventilation method according to the present invention, the shape of the lath net 1 is optimized without changing the weight as compared with the conventional product, thereby reinforcing the mortar layer. The entire lath net 1 (whole surface) subjected to the corrugation processing effectively contributes to the stiffening action, increasing the out-of-plane rigidity in a well-balanced manner, improving the workability of the mortar coating work, and consequently high strength and High rigidity and high quality mortar outer wall can be constructed.
Specifically, as a result of optimizing the shape of the lath net 1 and increasing the out-of-plane rigidity in a balanced manner, it is possible to realize a long span of the trunk edge 21, in other words, the use of the auxiliary trunk edge 22.

<Confirmation of effect of out-of-plane rigidity of lath 10 for outer wall ventilation method according to Example 1>
Next, while confirming the effect of the out-of-plane rigidity of the lath 10 for the outer wall ventilation method according to the configuration described in the first embodiment (mainly refer to the paragraph [0022]), the outer wall that can effectively improve the out-of-plane rigidity. The variation of the ventilation method lath 10 is investigated.

The inventors of the present applicant used a thin plate model in FEM analysis as a study on increasing the rigidity of the expanded metal lath (lath net 1), and compared the influence of the shape of the lath corrugation on the out-of-plane rigidity.
(Summary of analysis)
-Analysis software to be used FEM solver: Marc2012
Pre-post processor: Mentat 2012
・ Type of analysis Three-dimensional stress analysis as a large deformation problem considering geometric nonlinearity

(Analysis model, see Fig. 6)
The basic conditions in the analysis model are shown below.
The lath longitudinal direction (lateral direction) is the X direction, and the lath short direction (vertical direction) is the Y direction.
-Assume that the barrel edge interval is 500 mm in the X direction, the staple interval is 500 mm in the X direction, and 138 mm in the Y direction.
-The lath range to be examined is a 500 mm horizontal span, which is the torso interval, and the modeling range is 69 mm long by 250 mm wide considering symmetry.
Analysis cases A to G (analysis case D is not described. The same applies hereinafter) are modeled by a thin plate shell element (element 139).
In all models, the height of the lath wave (the difference in height between the upper flange 11 and the lower flange 12) is uniformly 7 mm, and the thickness of the thin plate model is 0.2 mm.

(Boundary condition, see FIGS. 7 and 8)
Restriction condition: All nodes on the trunk edge are restricted in the Z direction, and the stapling position is restricted in movement in the XYZ directions and restricted in the Y direction.
Load condition: Equally distributed load in the out-of-plane direction, and given so as to be 444 N / mm ² in the Z direction on all the thin plate shell elements projected on the XY plane.
Symmetry conditions: nodes on the X-axis direction symmetry plane are restricted in the Y direction / XY direction rotation, and nodes on the Y axis direction symmetry plane are restricted in the X direction / YZ direction.
(Material conditions)
The Young's modulus is 200 GPa and the Poisson's ratio is 0.3.

(Analysis parameters)
9A to 9C show analysis model shapes. FIG. 10 shows a list of analysis cases A to G. 11 and 12 show model diagrams of A1 to G1 (total 10 patterns) of analysis cases A to G in FIG.
As shown in FIG. 10, the analysis cases were performed for a total of 6 cases of A to G. Analysis cases A to C have two wave numbers with respect to the staple interval (upper flange 11 = crest), analysis cases E and F have three wave numbers with respect to the staple interval, and analysis case G has the staple interval. In contrast, a lath shape with four wave numbers is considered. The characteristics of each analysis case are shown below.
A: Case where the wave number is a standard of two lath shapes with respect to the staple interval.
B: The case where the wave width was changed with the same wave center position and corrugation angle (45 degrees) as A.
C: Case where the corrugation angle is changed with the same center position / width of the wave as A.
E: A case where the wave number is a standard of a lath shape with respect to the staple interval.
F: Case where the center position of the wave is the same as E and the width of two of the three waves is changed.
G: Case where the lath shape has a standard wave number with respect to the staple interval.

<Analysis results>
The displacement is evaluated at two nodes at the displacement measurement positions (“left: point A” and “right: point B”) shown in FIGS.
(1) Overall Behavior As the overall behavior in this analysis, a substantially linear load displacement relationship as shown in FIG. 13 was obtained for A1 of Analysis Case A. For other analysis cases, although the numerical values are different, a substantially linear load displacement relationship as shown in FIG. 13 was obtained in common.
Therefore, as the evaluation of the analysis value, the rigidity of each analysis case is evaluated from a straight line composed of two points, the origin and the maximum load (444 N / mm ² o'clock). In addition, the Mises stress of each analysis model at the maximum load is sufficiently small with respect to the yield of the steel material, and this analysis does not consider the plasticization of the model.
(2) Comparison of analysis values Comparison of analysis values is shown in FIG. 14A and a graph is shown in FIG. 14B.

(3) Influence of parameters The influence of parameters in each analysis case is as follows.
(3-1) Influence of wave width when there are two wave numbers (for analysis cases A and B)
14A and 14B, A1 having a wave crest width of 35 mm has the highest rigidity ratio (rigidity), and then B2, B3, and B1 in that order.
(3-2) Influence of corrugation angle when there are two wave numbers (for analysis cases A and C)
As the corrugation angle becomes steep from 45 degrees (A1) to 60 degrees (C1) and 90 degrees (C2), the rigidity increases and the weight per unit also increases. The stiffness ratio was C2 (1.14), C1 (1.07), and A1 (1.00) in order from the top, but the stiffness ratio per weight was C1 (1.04), C2 (1, 03) and A1 (1.00) in this order, and the case where the corrugation angle is 60 degrees is the maximum.
(3-3) Effect of wave width when there are three wave numbers (for analysis cases E and F)
14A and 14B, the stiffness ratio of F1 greatly decreased from 1.04 to 0.90 with respect to E1. On the other hand, the stiffness ratio of F2 to E1 was the same as 1.04.
(3-4) Influence of wave number (for analysis cases C1, E1, and G1)
14A and 14B, the rigidity ratio of analysis cases C1, E1, and F1 is highest at 1.07 for C1 with two wave numbers, and then E1 (1.04) with three wave numbers and G1 with four wave numbers. (1.03). Since the weight increases as the number of undulations increases, the rigidity ratio per weight is in the same order.

<Discussion>
When compared in terms of wave number, two wave numbers resulted in the highest rigidity against weight.
This is presumably because the merit of increasing the wave number has been reduced due to the limitation of the target specification conditions for the high rigidity lath (wave height difference within 7 mm, span 500 mm).
<Summary>
When each analysis case is compared, the out-of-plane rigidity of the corrugated shape of C1 is high. As a conclusion, the number of waves is 3 with respect to the staple interval, 2 rather than providing 4; the angle of corrugation is 60 degrees rather than 45 degrees; and the width of the waved flat part (upper flange 11) is about 35 mm. The lath shape has been found to be effective with respect to out-of-plane stiffness.

<Additional analysis>
Next, the inventor of the present applicant, as shown in FIG. 15, has a range of about 30 to 40 mm with respect to the width dimension D of the wave front plane portion (ie, upper flange 11) of the lath (lath net 1). It was verified that it was appropriate.
FIG. 15A shows the analysis model shape. FIG. 15B is a graph showing the stiffness per lath weight at points A and B, which are important points in verifying the out-of-plane rigidity possessed by the lath (lath net 1).
The lath analysis result in the thick frame shown in FIG. 15B, that is, when the width D of the wave top (upper flange 11) is 35 mm and the wave angle θ is 60 degrees is used as a reference. Incidentally, the width under the wave (lower flange 12) is about 26 mm when applied to the calculation formula shown in FIG. 15A. In short, the upper flange 11 corresponds to a lath (lath net 1) in which the lower flange 12 is formed at a pitch of about 26 mm and the web 13 is formed at a pitch of 7 mm.

As an example, the analysis results on both sides of the thick frame will be examined.
First, the lath analysis result when the width D of the wave top (upper flange 11) is 30 mm and the wave angle θ is 60 degrees will be examined. The width of the wave bottom (lower flange 12) is about 30 mm.
In this case, the A point is 0.94 times, the B point is 0.99 times, and the average is 0.97 times compared to the value in the standard thick frame. It turns out that it is equipped.
Next, a lath analysis result when the width D of the wave top (upper flange 11) is 40 mm and the wave angle θ is 60 degrees will be examined. The width of the wave bottom (lower flange 12) is about 21 mm.
In this case, the A point is 1.04 times, the B point is 0.97 times, and the average is 1.00 times compared to the value in the standard thick frame. ).
As shown in FIG. 15B, the other parameters were found to have rigidity (out-of-plane rigidity) having a value substantially equal to the value in the reference thick frame.

<Summary of additional analysis>
From the result of the additional analysis, the corrugation angle of the lath net 1 is preferably 45 to 75 degrees (especially around 60 to 75 degrees), and the width D of the undulation plane portion (upper flange 11) is about 30 to 40 mm. It can be said that the shape of the lath net 1 having these parameters is particularly effective for out-of-plane rigidity.

Although the embodiments have been described with reference to the drawings, the present invention is not limited to the illustrated examples and includes a range of design changes and application variations that are usually made by those skilled in the art without departing from the technical idea thereof. I will mention that just in case.
For example, the lath according to the present embodiment is constituted by a single lath net 1, but a bone having a diameter (φ) of about 1.6 mm that is thicker than the wire rod is vertically, horizontally, or vertically and horizontally. It can also be implemented by being composed of a composite that is arranged at a required interval (for example, 120 to 150 mm pitch) and joined to the lath net 1 by spot welding or the like.

1 Lath net (expanded metal lath)
2 Backing material 10 Lath for outer wall ventilation method 11 Upper flange 12 Lower flange 13 Web 21 Venting trunk edge (trunk edge)
22 Auxiliary trunk edge

Claims (5)

It is a lath for the outer wall ventilation method formed by lining a backing material on a lath formed of a lath net,
The lath net for an outer wall ventilation method characterized in that the lath net is bent and formed into a trapezoidal wave shape in which an upper flange and a lower flange are alternately connected via a web in a longitudinal direction.   The lath for an outer wall ventilation method according to claim 1, wherein the width dimension of the upper flange of the lath net is equal to or greater than the width dimension of the lower flange.   The lath for an outer wall ventilation method according to claim 1 or 2, wherein a width dimension of an upper flange of the lath net is about 30 to 40 mm.   The lath for an outer wall ventilation method according to any one of claims 1 to 3, wherein an inclination angle of the web with respect to an extension line of a lower flange of the lath net is about 45 to 75 degrees.   The lath for an outer wall ventilation method according to any one of claims 1 to 4, wherein a difference in height between an upper flange and a lower flange of the lath net is about 5 to 8 mm.

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