JPH10331336A - Flat plate roof material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rarely cause jumping up by molding a flat plate roof material made thick at the center section of a flat plate-like main body, and cutting off both comers of the rear half section of the flat plate-like main body into a linear shape or a curved shape to form a nearly base plate shape. SOLUTION: A flat plate roof material 1 made of a fiber-reinforced cement board is molded, and both corners of the rear half section of the roof material 1 not exposed to the outside when the succeeding roof material 1 is overlapped on the roof material 1 are cut off into a curved shape to form cutoff portions C. The center section 2 of the roof material 1 is made thick, the width W1 of the thick center section 2 is set to 50-70 % of the whole width W of the roof material 1, and the width W2 of the right and left portions 3, 4 of the center section 2 of the roof material 1 is set to 15-25 % of the whole width W of the roof material 1. Even when jumping-up occurs on the roof material 1, steps ST' are provided at the boundaries between the center section 2 of the roof material 1 and both the right and left portions 3, 4, and the steps at the boundaries between adjacent roof materials are inconspicuously distracted by the steps ST'. The infiltration of rain water from the overlap sections of the roof materials 1 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat roofing material, and more particularly to a flat roofing material made of a fiber reinforced cement board.

[0002]

BACKGROUND OF THE INVENTION Fiber-reinforced cement boards have been used in earthquake-resistant houses and the like as lightweight flat roofing materials. The flat roofing material is a wet method of forming a sheet by forming a slurry in which a raw material mixture mainly composed of cement and reinforcing fibers is dispersed in water, forming a sheet, pressing, curing and curing, and forming the raw material mixture into a layer on a forming belt. It is manufactured by a dry method in which the supplied and formed sheet is hydrated, pressed, cured and hardened, etc., and the surface is coated in any method.

[0003] When the above flat roofing material is laid on a roof, a plurality of roofing materials (1A) are attached to the left and right ends from a tip of an eave on a sloped base plate B via a starter SP as shown in FIG. The first half of the plurality of roofing materials (1A) in the second row (eave side) is secured to the first row by a plurality of roofing materials (1A). Are arranged in a row in a row on the second half (side of the eaves ridge) and fixed with nails N, and thereafter the third and subsequent rows are fixed in sequence.

In this case, the roof material (1A) is a starter SP
And the thickness of the roofing material (1A) itself,
With respect to the angle .theta. And, the length (vertical dimension) and the thickness of the roof material (1A) in the roofing direction vary, or the distance from the nailing part to the eaves tip and the distance from the nailing part to the eaves building side end. From the relationship,
As shown in FIG. 12, the degree of lifting of the eaves tip of the roofing material (1A) with respect to the base line BL corresponding to the upper surface level is slightly different for each roofing material (1A) as shown in FIG. (1
A) A step ST occurs at the boundary between each other. In particular, the roofing material (1A) is desirably formed into a substantially base plate shape in which both corners of the rear half where the roofing material (1A) of the rear row that is not exposed to the outside are overlapped are cut straight or curved in order to save material. , The roofing material (1A)
When the base plate is shaped like this, the distance from the nailing portion to the tip of the eaves is reduced, and the rigidity of the rear half is reduced. The rise is noticeable.

[0005] Further, with the above flat roof material, after roofing work,
As shown in FIG. 13, the roof material (1A) warps in the left-right width direction due to the change over time, and both ends in the left-right width direction of the roof material (1A) jump up. In the case where it differs for each 1A), a step ST is generated at the boundary between adjacent roof materials (1A). Alternatively, due to the above-mentioned temporal change and nailing force during roofing construction, floating occurs in the roofing direction of the flat roofing material (1A) as shown in FIG. 14, and the eaves side of the roofing material (1A) jumps up. Even when the degree of the jumping is different for each roofing material (1A), a step ST occurs at the boundary between the adjacent roofing materials (1A).

[0006] Roof materials adjacent to each other due to the above various causes
(1A) If a step ST occurs at the boundary between the two, especially in the flat roof material (1A) having a flat shape, such a step ST is very conspicuous and causes a problem in appearance. Also roofing material
If the lift of (1A) in the direction of the roofing foot is large, the roof material (1A) jumps greatly on the eaves side and a large gap S is generated at the overlapping portion with the preceding roof material (1A), and the flat wind (1A) is apt to be peeled off from the base plate B, and there is a problem that rainwater easily enters through the gap S.

[0007]

2. Description of the Related Art Conventionally, as shown in FIG. 15, there has been provided a flat roofing material (1B) in which a curved surface in the direction of a roofing foot having a convex curved surface is provided on the surface side (JP-A-4-64407).
issue). Even if the roof material (1B) warps in the roofing direction and the eaves side jumps up, since the warping in the roofing direction becomes a convex curved surface on the surface side opposite to the warping, Since the warpages cancel each other out, the eaves side of the rear roofing material (1B) does not jump up, and the state of being substantially in contact with the roofing material (1B) of the preceding stage can be maintained. The roofing material (1B) is formed by cutting a sheet formed by a wet method or a dry method into a roofing material body, stacking a large number of the roofing material body with its surface facing upward, and correcting the roofing material volume stack. It is manufactured by a method of forming a warp that forms a convex curved surface on the surface side by sandwiching between members and performing final curing.

[0008]

In the above-mentioned roofing material, only measures against warpage in the direction of the roof are taken, and measures against warpage in the horizontal direction are not taken. The generation of a step at the boundary between the materials cannot be prevented. Also, if the warp in the roofing direction during or after roofing is greater than the warpage in the roofing direction formed on the roofing material, the level difference between the roofing materials based on the warping in the roofing direction. Can not be prevented. In addition, an extra member called a straightening member is required for shaping the warp in the manufacturing stage.

[0009]

According to the present invention, as a means for solving the above-mentioned conventional problems, a central portion (2) of a flat main body is provided.
The present invention provides a flat roofing material (1) having a thicker wall. In order to save material, the flat body is desirably formed into a substantially base plate shape in which both corners of the rear half, which are overlapping portions that are not exposed to the outside, are cut off in a straight line or in a curved shape. In particular, a fiber reinforced cement board is desirable.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to one embodiment shown in FIGS. Flat roof material (1) as shown in Figure 1
Is a fiber reinforced cement board, and the roofing material (1) is not exposed to the outside when the roofing material (1) is roofed and the latter roofing material (1) is layered. Therefore, the material corresponding to the cut-off portion C is saved.

As shown in FIG. 2, the center of the roofing material (1)
(2) is thickened, and the width W ₁ of the central portion (2) of the thickness is
The width W ₂ of the 50% to 70% and it is desirable that the total width W of roofing material (1), also the right and left portions (3,4) of the central portion (2) of the roofing material (1) Is 15 of the total width W of the roofing material (1).
It is desirably set to ２５25%.

Further, the thickness D ₂ of the central part (2) of the roofing material (1)
It is increased 5-15% of the thickness D ₁ of the other parts of the roofing material (1), i.e., _{1.05D 1 ≦ D 2 ≦ 1.15D 1} .

By setting the width and thickness of the central portion (2) of the roofing material (1) as described above, the raw materials used for the roofing material (1) can be minimized (the center of the wall thickness). The portion (2) reinforces the roofing material (1) and can suppress warpage in the roofing direction.

If the width W ₁ of the central portion (2) of the roofing material (1) is less than the above range, the reinforcing effect by the central portion (2) becomes insufficient, and if it exceeds the above range, the reinforcing effect is not so improved. However, only the raw material usage has increased, and the raw material cost has increased,
Moreover the central portion of the roofing material (1) the thickness D ₂ of (2) becomes insufficient reinforcing effect by the central portion below the above range (2), also superimposed roofing exceeds the above range (1) The gap between the parts becomes large, rainwater easily penetrates into the inside, the difference in thickness between the central part (2) and other parts becomes large, and the pressing pressure exerted on the central part (2) during pressing and the right side And the difference from the press pressure exerted on the left part (3, 4) increases,
There will be significant differences in product density and moisture content.

Examples of the raw material of the roofing material (1) include hydraulic cements such as portland cement, blast furnace cement in which portland cement is mixed with blast furnace slag, fly ash cement in which fly ash is mixed, and cement such as alumina cement. Raw materials, silica powder, silica powder,
Silica fume, diatomaceous earth, silica fine powder such as clay, and wood reinforcing fiber materials such as wood flour, wood wool, wood chips, wood fiber, wood pulp, wood fiber bundle, sepiolite, wollastonite,
A reinforcing fiber material such as an inorganic reinforcing fiber material such as glass fiber;
If desired, a mixture of lightweight aggregates such as perlite, shirasu balloon, expansive shale, expansive clay, coal waste, etc. is used. In the raw material mixture, usually, cement is 28 to 40% by weight (hereinafter simply referred to as%), silica fine powder is 28 to 40%, reinforcing fiber material is 5 to 20%, and when lightweight aggregate is mixed, 3 to 10 is used. % Used.

To manufacture the roofing material (1) of the present invention, first, a sheet or mat of the raw material mixture is formed. As a method of forming the sheet or mat, a slurry in which the raw material mixture is dispersed in water is used. A wet method of forming a sheet and forming a sheet, a dry method of supplying the raw material mixture in a layered form on a forming belt and pressing a roll to form a mat, and a kneaded product obtained by kneading the raw material mixture with water. There is an extrusion molding method for extruding from a plate.

When the sheet is formed by the wet method, for example, when the slurry is poured out of the flow box onto the papermaking net, a weir (5) as shown in FIG. (6) Increase the amount of the slurry (7) poured out at the center.

When the mat is formed by the dry method, for example, the amount of the raw material mixture to be supplied in layers on the forming belt is increased at the center by a weir as in the wet method. When the sheet is formed by the extrusion molding method, the width of the central portion of the discharge port of the T die attached to the nozzle of the extrusion molding machine may be widened so as to be thick.

The sheet or mat formed as described above is pressed or pressed to cure and cure. The step of cutting the roofing material from the sheet or mat is performed before curing of the sheet or mat. It is desirable to be performed. In any case, since the scrap generated from the above-described cutting step is in an uncured state, the scrap can be mixed with the raw material and reused, and can be curved in the left-right width direction with the surface side convex during stacking curing.

The roofing material body thus obtained is temporarily cured by leaving it unheated or heated under normal pressure in a closed room for usually 6 to 30 hours.
Autoclave curing for ~ 15 hours to complete cure. The surface of the fully cured roofing material is usually painted to produce the roofing material (1).

As shown in FIG. 4, a plurality of the manufactured roofing materials (1) are stacked, bound by a band (8), and stored or transported. In such a stacked and tied state, a gap S is formed on the left and right sides of the center portion (2) of the roofing material (1), and as a result, the roofing material (1) becomes convex on the surface side by the tightening force of the band (8). It curves further in the left and right width directions.

The roof material (1) curved in the width direction having a convex surface on the front side as described above is further prevented from warping by the curved shape in combination with the reinforcing effect of the thick central portion (2). Is done.

As shown in FIGS. 6 and 7, the roofing material (1) is laid on the field board B and fixed with nails (9). The roofing material (1) is located at the center (2). Is thickened and curved in the width direction with its upper surface convex, so that it is unlikely to be lifted in the direction of the roof even by the nailing force at the time of roofing. In addition, warping in the roof foot direction and in the left-right direction hardly occurs even with the passage of time after the roofing work. As described above, in the roofing material (1) of the present invention, since the jumping is suppressed, the gap between the overlapping portions of the front and rear roofing materials (1A) is reduced,
The roof material (1) is prevented from peeling due to rainwater intrusion from the gap or strong wind from the eaves side.

However, even if the roof material (1) jumps up and the unevenness of the jump causes a step ST at the boundary between the adjacent roof materials (1A), as shown in FIG. 6 and FIG. (1) Central part (2) and each side and both left and right parts
There is also a step ST 'at the boundary with (3, 4), and therefore the step ST is interspersed with the step ST' and becomes inconspicuous. Particularly, in the case of this specific example, as shown in FIG. 6, the roof material (1A) in the right row is laid so as to be shifted in the left-right direction for each row. Is). Therefore, the steps ST and ST 'of the front and rear roof materials (1) do not overlap and are staggered, so that the steps ST and ST' are less noticeable.

In particular, as described above, when the roof material (1) is curved in the left-right width direction, as shown in FIG. End is baseline B
L is almost in close contact with the roofing material (1)
A) The step ST at the mutual boundary is almost completely eliminated.

The present invention is not limited to the above specific example, but may be a shape in which both rear half corners are linearly cut off as shown in FIG.

[0027]

Since the roofing material of the present invention is reinforced by thickening the central portion, the roofing material is unlikely to jump up due to nailing force at the time of roofing or a change with time after the roofing. Since there is no large gap in the overlap between the roofing material and the roof material at the subsequent stage, rainwater may enter the interior from the overlapping portion between the roofing material and the roofing material, or the roof material may peel off due to strong wind from the eaves side of the roofing material The defect is eliminated. Further, even if a step ST occurs at the boundary between the adjacent roof materials (1A), the step ST 'is also provided at the boundary between the central portion (2) of the roof material (1) itself and the left and right side portions (3, 4). Is present, the step ST becomes inconspicuous.

[Brief description of the drawings]

 1 to 7 show an embodiment of the present invention.

FIG. 1 is a plan view

FIG. 2 is a front view

FIG. 3 is an explanatory diagram of sheet forming (wet method).

FIG. 4 is a diagram showing a state of stacking and binding roof materials.

FIG. 5 is a perspective view of a curved roof material.

FIG. 6 is a plan view of a roofing construction state.

FIG. 7 is a cross-sectional view of a roofing construction state.

FIG. 8 is a front view of a roofing state.

FIG. 9 is a front view of the roofing material that is curved in the width direction.

FIG. 10 is a plan view of another example of a roofing material. FIGS. 11 to 13 show a conventional example.

FIG. 11 is a side sectional view of a roofing material laid state.

FIG. 12 is a front view of a roofing state.

FIG. 13 is a cross-sectional side view of a roofing state when a warp occurs.

FIG. 14 is a sectional side view of a conventional example of roofing construction.

FIG. 15 is a side sectional view showing a roof material roofing construction state of a conventionally improved example.

[Explanation of symbols]

 1 Roofing material 2 Central part

Claims (3)

[Claims] 1. A flat roof material in which a central portion of a flat main body is thickened. 2. The flat roofing material according to claim 1, wherein the flat main body has a substantially base plate shape in which both rear corners are cut off in a straight line or a curved line. 3. The flat roofing material according to claim 1, wherein the flat roofing material is made of a fiber reinforced cement board.