JPS6114028A - Production of lath for building - Google Patents

Abstract

PURPOSE:To obtain a lath for building connecting the mesh without cutting by slitting the metallic plate feeding at a fixed speed by the upper edge connecting the trapezoidal edge regulating the angle of mutual size and by widening and deforming from a flat hexagon to a regular hexagon. CONSTITUTION:A slit is formed by dropping the upper edge having the angle (a) of less than 30 deg. making the slant side and bottom side, on a metallic plate 1 and is widened with pushing along the edge shape. The metal lath 20 connecting the mesh 21 thus obtd. is fed out to the arrow mark direction passing through the space between the 1st pinch roll 12 and the 2nd pinch roll 14. At this moment due to the rotation speed of the roll 14 being made faster than that of the roll 12, a tension is acted on the metal lath 20 with the differential speed caused between both. The metal lath 20 is thus stretched out slowly as shown in the figure and when it is rolled out from the roll 14, a lath for building connecting a regular hexagonal mesh 21 which is solid and has no fear of causing a crack on a mortar nor break away connecting the mesh 21 of almost regular hexagon by deforming the mesh 21 to nearly regular hexagon, is obtd.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for manufacturing lath for construction, and more particularly, a method for manufacturing lath for construction by connecting cross-pressure hexagonal frames, and a method for manufacturing lath for construction by connecting cross-pressure hexagonal frames. The present invention relates to a method of manufacturing a construction lath having a protrusion on one surface.

[Prior art]

Conventionally, metal lath with connected diamond-shaped frames has been widely used as architectural lath for cement mortar coating on the exterior walls of buildings, etc., but buildings using such metal lath have a crank on the mortar wall. There is a problem in that it is easy to get stuck in and peel off from there. This is due to the shrinkage of the cement itself,
It is said that the cause is the grain size of the sand, the construction method, etc., but it has also been pointed out that one of the causes of cracks is that the shape and structure of the metal lath has a large influence. As a solution to such problems, Utility Application No. 56-41324
The specification of Japanese Utility Model Application No. 57-153638 discloses a construction lath in which frames made of regular hexagons are connected in a mesh pattern. This construction lath is robust and has the remarkable effect of preventing sagging, so its practical use is eagerly awaited in the construction industry. However, construction lath with this structure is difficult to manufacture. The reality is that it has not yet appeared on the market.

By the way, metal lath is usually manufactured using a single metal plate <m plate, galvanized iron plate, aluminum plate, copper plate, etc.) by cutting slits in it and simultaneously pushing it out into a mesh shape. That is, as shown in FIGS. 10(a) and 10(b), a triangular blade is formed on the metal plate 6 that is fed by a vinyl roll (not shown) and moves at a constant speed over the lower blade 1. Upper blade 2
is dropped to form a slit in the metal plate 6 between it and the lower blade 1, and as shown in FIG.

Next, when the upper blade 2 is raised, moved in the direction of the arrow as shown in FIG. 11, and dropped again, the metal plate 2
is moving at a constant speed in the direction of arrow a, so second slits 4a are formed at a predetermined interval from the first slit 4 and are pushed downward. In this way, the upper blade 2 moves left and right and repeats the above operation to form the slit 4 as shown in FIG. Because it comes,
The slit 4 simultaneously becomes a metal plate 6a and is expanded into a planar shape, making it possible to manufacture a metal lath 5 with continuous diamond-shaped meshes 6 as shown in FIG.

The process of forming the mesh 6 of the metal lath 5 consisting of such a diamond-shaped mesh will be explained with reference to FIG. 14(a). In the figure, ゛ 4: Length l from the center of the metal plate B to one end, : Length l from the center to one end when the metal plate 3 is spread out with the upper blade 2 to become the metal plate 3a. Length α: The angle formed by the oblique side and the bottom of the upper blade 2, which corresponds to the angle at which the upper blade 2 pushes the metal plate 3 apart.

Here, 11, =l/CO5α, and when α=0°, cosα=1.000, and when α=9σ, cosα=0. As is clear from the Cl00 diagram, when the metal plate 6a is expanded at the same time as the slit 4 is made, elongation (All G) occurs in the metal plate 6a, and this elongation is α
The larger the value, the larger the value. According to the results of the experiments conducted by the researchers,
It has become clear that when tension is applied to the metal lath 5, the elongation rate of each frame 7 constituting the mesh 6 is limited to about 25%, and if it elongates more than this, it will be cut.

α at this time is 30 to 33°.

Therefore, in the case of the diamond-shaped mesh 6 of the conventional metal lath 5, since α is about 30°, the mesh 6 can be formed without cutting.

Next, a metal lath 8 in which regular hexagonal meshes 9 are connected as shown in FIG. 16 will be considered. In this case, upper blade 2
As shown in Fig. 14(b), a trapezoidal blade made of two halves of a regular-sized square is used. Now, the length is 1. When a slit 4 is made in the metal plate 6 of +2/J) as in the case of FIG.
+24 ).

That is, when l-1,α=60°, therefore, elongation rate=Muni Lx1oo-YawX 100=100(
(6), where l is approximately twice the original length l, and its elongation rate is 100%, which is four times the allowable limit of 25%.

For this reason, the metal plate 3a cannot withstand the tension and ends up being cut, making it impossible to manufacture a metal lath in which regular hexagonal meshes are connected.

[Purpose of the invention]

The present invention was made to solve the above-mentioned conventional problems, and its purpose is to realize a method of manufacturing lath for construction by connecting regular hexagonal meshes without cutting them. It is in.

Still another object of the present invention is to provide a method for manufacturing a construction lath in which a protrusion is provided for positioning the metal lath in the center of the mortar.

[Summary of the invention]

In order to achieve the above object, the present invention is provided with an upper blade in which the lengths of the upper side and the oblique side are equal, and the angle formed by the base and the oblique side is 33° or less, which are connected at a constant speed. A method for manufacturing lath for construction, comprising making a slit in a metal plate and pushing it apart to produce a metal lath in which flat hexagonal meshes are connected, and gradually stretching the metal lath to transform the mesh into a substantially regular hexagonal shape. This is what we provide.

Furthermore, the present invention also provides the metal lath manufactured by the above method.
The present invention provides a method for manufacturing a construction lath in which a large number of protrusions are provided at desired intervals on one surface.

[Embodiments of the invention]

FIG. 1 is a schematic diagram showing an example of an apparatus for implementing the present invention. In the figure, 11 is a screen cutter, which is a conventional thin cutter.
Like the machine, it consists of an upper blade that moves vertically and horizontally, and a fixed lower blade, but the upper blade 2 is a series of connected trapezoidal blades that are divided into two halves of a flat regular hexagon, as shown in Figure 2. , the angle α between the hypotenuse and the base is selected to be 30” to 33°.12
13 is the first pinch roll provided on the exit side of the screen cutter 11;
+(7) is a second pinch roll provided on the downstream side, and is equipped with sprockets 1 and 15, respectively, and the diameter of the sprocket 13 of the first pinch roll 12 is the same as that of the sprocket 15 of the second pinch roll 14. It is formed larger than the diameter of. Numeral 16 is a chain suspended between both sprockets 16 and 15, 1 and 7 are motors, and 18 is a speed reducer, the output of which is transmitted to the sprocket 15 via chain 19.

Next, according to the above one! A method of manufacturing a construction lath made by connecting regular hexagonal meshes will be described.

(1) Drop the upper blade onto the metal plate 1 to form a slit and spread it out along a rectangle. Mesh 21 at this time
As shown in FIG. 6, the shape is a flat hexagon, and α is 30° to 33°, so there is no risk of the frame 22 of the mesh 21 being cut.

(2) Metal lath 2 in which such meshes 21 are connected
0, the first pinch roll 12 and the second pinch roll 1
4 and send it in the direction of Tenin. At this time, the rotational speed of the pinch rolls 12 and 14 is determined by the second pinch rule 14.
Since this is larger, a speed difference occurs between the two, and tension acts on the metal lath 20. For this reason, the metal lath 20 is gradually stretched as shown in FIG. 4, and when it leaves the second pinch roll 14, the mesh 21 is wide! A metal lath 20 is completed which is transformed into a regular hexagon and has regular hexagonal meshes 21 connected to each other.

In the above explanation, a case was shown in which a speed difference was provided between the pinch rolls 12 and 14 using sprockets 13° 15 of different diameters, but the speed difference between the pinch rolls 12 and 14 was created by electrically controlled snowmaking or other means. It may be provided.

Incidentally, each mesh of metal lath has unevenness equivalent to the thickness of the plate, but when viewed as a whole, it is normally finished in a flat state. If this is applied directly to a wall as a base material for mortar, there will be no space between it and the base water tank, and the mortar applied later will only adhere to the surface of the metal lath. For this reason, the adhesion strength of the mortar is low, which tends to cause cracking and peeling later on. In order for mortar and metal lath to work together to provide strength, it is necessary to create a structure in which the metal lath is located in the center of the mortar. There are lath and ribbed glass.
2. A fatigued lath has sinusoidal waves in a constant direction, but with this shape, the lath is not always located in the center of the mortar, and the waving reduces the effective width of the lath. The disadvantage is that it becomes narrow and material loss increases. In addition, ribras has a structure in which a mesh is created between ribs placed at regular intervals, and the mesh is located in the center of the mortar, but there is a large difference in stress between the ribs and the mesh. However, there are disadvantages such as the fact that it is easy to cause cracks, etc., and that there is a large amount of material loss because the rib portions do not form a mesh.

FIG. 5(a) is a plan view of a construction lath manufactured according to the first invention with protrusions provided on one plane, and FIG. 5(b)
) is its -thin sectional view. One surface of this construction lath 20H is provided with protrusions 23 in a staggered pattern or in parallel vertically and horizontally.According to the results of experiments, the size of the protrusions 26 is such that the diameter d of the tip is 10 to 10. It has a truncated conical shape with a diameter of about 25 fins,
Height h is 5 to 15 mm, left and right Ijj @ 11 is 100
~200 fights, and it was found that it is preferable for the front and back spacing 12 to be about 50 to 150 [gamma]m.

FIG. 6 is a schematic diagram of an example of an apparatus for manufacturing the metal lath protrusions 26 as described above. In the figure, reference numeral 61 denotes a fixed upper mold, on the lower surface of which grooves 32 and 33 of different lengths and open in the direction of movement of the metal lath 20 are provided alternately at predetermined intervals as shown in FIG. The difference in length corresponds to l in FIG. 5(a), and the interval corresponds to the right. 34 is a presser metal fitting provided below the upper mold 61, 65 is a movable table in which punches 66 are installed corresponding to the grooves 32 and 33 of the upper mold 61, 37 is a vertical shaft, and 68 is a vertical shaft 37 at one end.
40 is a cam that slides into contact with the other end of the lever 69.

In the above-described apparatus, the metal lath 20 sent out from the second pinch roll 14 shown in FIG. 1 is sent over the presser fitting 34 in the direction of the arrow.

At this time, the punch 66 is periodically moved up and down by the cam 40 to form the protrusion 26 on the metal lath 20 as shown in FIG. In the above description, the device for forming the protrusion 23 is provided on the same line as the screen cutter 11 (FIG. 1), and the protrusion 26 is attached to the metal lath 20 sent out from the second pinch roll 14. Although we have described the case where the two are provided, it goes without saying that the two may be provided on separate lines.

FIG. 9 shows an example of construction of the construction lath manufactured according to the present invention. During construction, as shown in FIG. Paper 42 and metal lath 20a (7) IIJ11111
'9″hgt't,,bot,;y,=”“-)7゛(
b) IDゝ When the mortar 43 is applied as shown in 2, since the metal lath 20a is located at the center of the mortar 46, the adhesion strength increases and a mortar wall that is less likely to crack or peel is obtained. Note that the protrusion 23 can be used for driving the fixing nail 44 into the lath 41.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and it goes without saying that various changes can be made without changing the gist of the present invention.

〔Effect of the invention〕

As is clear from the above description, according to the first invention,
It is possible to manufacture architectural lath made by connecting regular hexagonal meshes, which is strong and does not cause cracks or peeling of the mortar, without cutting the frame.
According to the second invention, it is possible to continuously form a protrusion for positioning the lath in the center of the mortar on the construction lath manufactured according to the first invention, so the effect of implementation is extremely large. be.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an example of an apparatus for carrying out the present invention,
Figure 2 is a schematic diagram showing the shape of the cutting edge of the upper blade in Figure 1 and the processing state of the metal plate, Figures 3 and 4 are plan views showing the manufacturing process of the metal lath, and Figure 5 (a) is FIG. 6 is a plan view of an example of a metal lath manufactured according to the second invention, (b) is a sectional view of its essential parts, FIG. 6 is a schematic diagram of an example of a device for carrying out the second invention, and FIG. FIG. 8 is a perspective view of the upper mold, FIG. 8 is an explanatory diagram of the operation, FIGS. 9(a) and (b) are sectional views showing a construction example of the construction lath manufactured by the present invention, and FIG. 10(a). (b) and (C) are schematic diagrams showing an example of manufacturing conventional construction laths, Fig. 11 is a plan view showing the movement of the upper blade, Fig. 12 is a plan view of the mesh of the rhombic lath, and Fig. 16 is A plan view of the mesh of the regular hexagonal lath, FIG. 14(a), (bl is an explanatory diagram showing the formation state of the rhombic mesh and the regular hexagonal mesh. 1: Lower blade, 2: Upper blade, 6: Metal plate, 11: Meshing machine, 12
: 1st pinch roll, 14: 2nd pinch roll, 2
0.20a: Building lath (metal lath), 21: Mesh, 26: Projection, 31: Upper mold, 32.33: Groove, 36:
Punch. Agent Patent Attorney Sanro Kimura Figure 14 (a) (b)

Claims (2)

[Claims] (1) Slits are made in a metal plate fed at a constant speed by an upper blade with connected trapezoidal blades whose top side and hypotenuse are approximately equal in length and the angle between the bottom and hypotenuse is approximately 33° or less, and the metal plate is forced out. A method of manufacturing lath for construction, comprising: manufacturing a metal lath in which flat hexagonal meshes are connected, and gradually stretching the metal lath to transform the mesh into a substantially regular hexagonal shape. (2) A metal plate is slit and pushed at a constant speed by an upper blade with connected trapezoidal blades whose top and hypotenuse lengths are approximately equal and whose angle between the base and hypotenuse is approximately 33° or less. The metal lath is expanded to produce a metal lath in which flat hexagonal meshes are connected, the metal lath is gradually stretched to transform the mesh into a substantially regular hexagonal shape, and a large number of holes are formed on one side of the metal lath at desired intervals using a punch or the like. A method for producing architectural lath provided with protrusions.