JP2019031783A - Sheet fixing unit - Google Patents

Abstract

To provide a sheet fixing unit capable of preventing a waterproof sheet from being separate or broken.SOLUTION: The sheet fixing unit comprises: a fixing member 5 for join and fixing a waterproof sheet 1 to a joint part 4; and an anchor member 6 for supporting the fixing member 5 with a base 2 at a central point than the joint part 4. Multiple slits 17 are formed each of which is cut from the outer end toward the center in the fixing member 5. Each portion 18 of the fixing member 5 is independently configured to be bent and deformable at the slit 17 as a boundary.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a sheet fixing unit that fixes a waterproof sheet to a base.

  A conventional sheet fixing unit is described in Patent Document 1 below, for example. The sheet fixing unit described in the same document includes a fixing member (“fixing disk” in the same document) for bonding and fixing a waterproof sheet to a joint (in the same document, “adhesive layer”), and a joint of the fixing members. Also, an anchor member (“fastener” in the same document) that supports the center side portion on the ground is provided.

JP 2017-20273 A

In the above conventional technology, when a strong wind blows on the waterproof sheet and the upper side of the waterproof sheet becomes negative pressure, or when the pressure on the lower side of the waterproof sheet is higher than the upper side, the sheet is fixed on the waterproof sheet. There may be a phenomenon (fluttering) in which a portion not fixed by the unit is lifted and undulated.
When such fluttering occurs, the waterproof sheet moves, and the force that pulls the outer end of the joint portion obliquely upward and upward acts from the waterproof sheet to the joint portion of the fixing member with the anchor member as a fulcrum. For this reason, there is a possibility that the waterproof sheet peels from the joint portion or the waterproof sheet is torn near the outer end portion of the joint portion due to such a force acting repeatedly.

  In view of the above circumstances, an object of the present invention is to provide a sheet fixing unit in which peeling or tearing of a waterproof sheet hardly occurs.

The seat fixing unit of the present invention is
A fixing member for bonding and fixing the waterproof sheet to the bonding portion;
An anchor member that supports a place on the center side with respect to the joint portion of the fixing member to the base, and is provided,
A slit is provided that cuts from the outer end of the fixing member toward the center,
Each part of the fixing member is configured to be able to bend and deform independently from the slit.

  According to the present invention, at the time of occurrence of fluttering, when a force that pulls the outer end side of the joint portion obliquely upward upward from the waterproof sheet to the joint portion as a fulcrum acts, Then, it bends and deforms at the slit, and absorbs the movement of the waterproof sheet. This makes it difficult for force to act on the joint from the waterproof sheet, and prevents the waterproof sheet from peeling off from the joint or tearing the waterproof sheet near the outer edge of the joint. It will be something. Therefore, if it is this invention, the sheet | seat fixing unit in which peeling and a tear of a waterproof sheet do not arise easily can be comprised.

In the present invention,
It is preferable that at least three or more slits are provided.

  According to this configuration, for example, the bending deformation of each part flexibly follows the movement of the waterproof sheet as compared with a structure in which the fixing member is provided with less than two slits, and the waterproof sheet is connected to the joint portion. On the other hand, it becomes difficult to apply a force inclined with respect to the out-of-plane direction. For this reason, it is possible to make the waterproof sheet hardly peel or tear.

In the present invention,
It is preferable that a hole portion larger than the width of the slit is provided at the center side end portion of the slit.

  According to this configuration, since the stress generated at the center side end of the slit is suitably dispersed at the hole during bending deformation of each part of the fixing member, cracks due to stress concentration from the center side end of the slit in the fixing member. Can be suitably suppressed.

In the present invention,
It is preferable that the width of the slit is smaller than the thickness of the waterproof sheet.

  According to this configuration, the waterproof sheet is difficult to be sandwiched between the slits when each part of the fixing member returns to its original state after being bent and deformed, so that the waterproof sheet can be prevented from being torn.

It is a schematic diagram explaining the force which acts on a sheet | seat fixing unit at the time of generation | occurrence | production of fluttering. It is a top view which shows the fixing member and leaf | plate spring of a sheet | seat fixing unit. It is a longitudinal cross-sectional view (AA sectional view of FIG. 2) which shows the sheet fixing unit etc. in the normal time, and shows a different cross section with a central axis as a boundary. It is a longitudinal cross-sectional view (AA cross section of FIG. 2) which shows a sheet | seat fixing unit etc. at the time of generation | occurrence | production of fluttering, and shows a different cross section with a center axis as a boundary. It is a longitudinal cross-sectional view which shows the sheet | seat fixing unit etc. in the normal time in another embodiment, and shows a different cross section with a central axis as a boundary. It is a longitudinal cross-sectional view which shows the sheet | seat fixing unit etc. in the normal time in another embodiment, and shows a different cross section with a central axis as a boundary. It is a top view which shows the fixing member and leaf | plate spring of a sheet | seat fixing unit in another embodiment.

Hereinafter, an embodiment which is an example of the present invention will be described with reference to the drawings.
The waterproof sheet 1 shown in FIG. 1 etc. is used for the waterproof construction method which provides a waterproof function to the foundation | substrate 2 of the roof which covers the upper part of a building, for example. The waterproof sheet 1 is laid on the roof base 2 to prevent the base 2 from being exposed to water. As shown in FIG. 1, the waterproof sheet 1 is partially fixed to the base 2 at a plurality of locations by a sheet fixing unit 3 arranged on the base 2 with an appropriate interval. The foundation 2 is, for example, a concrete foundation.

  The waterproof sheet 1 has flexibility and can be freely deformed. The waterproof sheet 1 is made of, for example, a heat-meltable thermoplastic resin material. Specifically, for example, the waterproof sheet 1 can be made of a material such as vinyl chloride, acrylic, olefin, or thermoplastic elastomer.

[Seat fixing unit]
In the sheet fixing unit 3 shown in FIGS. 1 to 4, a fixing member 5 for bonding and fixing the waterproof sheet 1 to the bonding portion 4, and a portion of the fixing member 5 on the center side of the bonding portion 4 is supported by the base 2. An anchor member 6 to be controlled and a restriction mechanism 7 for restricting the central portion of the fixing member 5 so as to be less likely to be bent and deformed than the outer end portion thereof are provided.

[About anchor members]
The anchor member 6 shown in FIGS. 1, 3, and 4 is a member that positions the fixing member 5 on the base 2. The anchor member 6 includes a head portion 8 on which a tool is applied and a threaded shaft portion 9 that is connected to the head portion 8 and has a diameter smaller than that of the head portion 8. The anchor member 6 is fixed to the base 2 by screwing the shaft 9 into the base 2 around the central axis X by applying a tool to the head 8. As the anchor member 6, for example, a countersunk screw as shown in FIGS. 3 and 4 can be used.

[About fixing members]
The fixing member 5 shown in FIGS. 2 to 4 and the like is made of, for example, a conductive material such as metal. The entire fixing member 5 is configured in a disk shape having a substantially disc shape. A bonding portion 4 is formed on the upper flat surface of the fixing member 5 by applying a thermoplastic resin adhesive (hot melt adhesive). As shown in FIGS. 3 and 4, the thickness of the joint 4 of the fixing member 5 is thinner than the thickness of the main body 10 of the fixing member 5. The fixing member 5 is provided with a recess 12 that accommodates the leaf spring 11 of the restriction mechanism 7 at a position below the joint 4.

  The fixing member 5 can be slightly moved in the horizontal direction with respect to the anchor member 6. That is, the hole diameter of the insertion hole 13 through which the anchor member 6 at the center of the fixing member 5 is passed is slightly larger than the shaft diameter of the shaft portion 9 of the anchor member 6. If it demonstrates, the fixed clearance gap 14 (movable margin of the fixed member 5) is provided between the edge part of the penetration hole 13, and the anchor member 6. FIG.

[Regulatory mechanism]
The regulating mechanism 7 shown in FIGS. 3 and 4 is provided with a leaf spring 11 positioned at the center of the fixing member 5. At the center of the leaf spring 11, a through hole 15 is provided that is smaller than the diameter of the head portion 8 of the anchor member 6 and larger than the diameter of the shaft portion 9 of the anchor member 6. The leaf spring 11 has a disk shape. A predetermined clearance 16 is provided between the inner surface of the recess 12 of the fixing member 5 and the outer surface of the leaf spring 11.

[About slits]
As shown in FIGS. 2 to 4, the fixing member 5 is provided with a slit 17 that cuts from the outer end portion of the fixing member 5 toward the center portion. In other words, the slit 17 is a defective portion where the fixing member 5 is lost. As shown in FIG. 2, the slit 17 extends along the radial direction of the fixing member 5. Further, the slits 17 are radially arranged on the outer edge portion of the fixing member 5 in a top view. In other words, the slits 17 are formed so as to be arranged at equal intervals in the circumferential direction of the fixing member 5.

  As shown in FIGS. 2 to 4, the slit 17 is formed to have a length that is at least half the radius of the fixing member 5. The width of the slit 17 is smaller than the sheet thickness of the waterproof sheet 1. A plurality of slits 17 are provided. In other words, at least three slits 17 are provided. Specifically, in FIG. 2 to FIG. 4, six slits 17 are provided. The slits 17 shown in FIG. 2 to FIG. 4 are equally spaced around the central axis X with an interval of 60 ° from each other.

[Regarding the portion of the fixed member that can be bent and deformed]
As shown in FIG. 4, each of the bending-deformable portions 18 of the fixing member 5 shown in FIGS. 2 to 4 is configured to be able to bend and deform independently from the slit 17. As shown in FIG. 2, each part 18 has a substantially fan shape. In other words, each part 18 has a petal shape in top view. The base end portion of each portion 18 on the central axis X side overlaps with the leaf spring 11 of the restriction mechanism 7 in the vertical direction.

  As shown in FIGS. 2 to 4, a skirt portion 19 that bends downward is provided on the outermost end side of each portion 18. Since the outermost end portion of the skirt portion 19 in the portion 18 is separated from the waterproof sheet 1, it is avoided that the waterproof sheet 1 is damaged by the edge of the outermost end portion of the portion 18.

  A portion (circumferential end) where the slit 17 is formed in each portion 18 shown in FIGS. 2 to 4 is chamfered. Thereby, it can avoid that the waterproof sheet 1 is damaged by the edge of the circumferential direction edge part of each site | part 18 when each site | part 18 bends and deforms like the case where chamfering is not carried out, for example.

[How to install a waterproof sheet using a sheet fixing unit]
First, the fixing member 5 is placed on the base 2, the anchor member 6 inserted and supported by the leaf spring 11 of the regulating mechanism 7 is screwed into the base 2, and the fixing member 5 is supported on the base 2 via the anchor member 6. . In this way, the sheet fixing unit 3 is fixed to the base 2 at a plurality of locations at predetermined intervals. Next, the waterproof sheet 1 is laid on the sheet fixing unit 3, and for each sheet fixing unit 3, an induction heating device (not shown) is applied to the flat surface of the fixing member 5 of the sheet fixing unit 3 over the waterproof sheet 1. At the same time, the waterproof sheet 1 is melted, and the waterproof sheet 1 is heat-sealed to the joint portion 4 which is a flat surface of the fixing member 5 to be bonded and fixed. This operation is sequentially performed for each sheet fixing unit 3. Thereby, the waterproof sheet 1 is partially fixed to the base 2 via the sheet fixing unit 3.

[When fluttering occurs]
As shown in FIGS. 1, 3, and 4, since the waterproof sheet 1 is not entirely bonded to the base 2, strong wind blows on the waterproof sheet 1, and the upper side of the waterproof sheet 1 is negative. When the pressure is increased or when the pressure on the lower side of the waterproof sheet 1 is higher than that on the upper side, a portion of the waterproof sheet 1 that is not fixed by the sheet fixing unit 3 is lifted and undulates (fluttering). There are things to do.

  In such a case, as shown in FIG. 1, a lifting force N that pulls the outer end 4 </ b> A of the joint 4 in the fixing member 5 obliquely upward upward acts from the waterproof sheet 1. The component of the lifting force N includes a lateral force NH (horizontal force) that pulls the fixing member 5 outward and an upward force NV (vertical force) that is orthogonal to the lateral force NH. Such a lifting force N acts on the joint portion 4, whereby the waterproof sheet 1 is peeled off at the outer end portion 4 </ b> A of the joint portion 4, the waterproof sheet 1 is broken at the outer end portion 4 </ b> A of the joint portion 4, Inconveniences such as bending are likely to occur.

  However, with the structure of the sheet fixing unit 3, as shown in FIGS. 1 and 4, when the fluttering occurs, the portion 18 of the fixing member 5 that receives the force from the waterproof sheet 1 is different from the other portions 18. Bends and deforms independently. Thereby, the upward force NV acting on the joint portion 4 is dispersed, and the force acting on the joint portion 4 is reduced. Accordingly, it is possible to prevent the waterproof sheet 1 from being peeled from the joint portion 4, the waterproof sheet 1 being torn in the vicinity of the outer end portion 4 </ b> A of the joint portion 4, and inconveniences such as bending of the fixing member 5. In addition, since each portion 18 of the fixing member 5 is bent and deformed, the energy of movement of the waterproof sheet 1 is absorbed, so that the pulling force via the fixing member 5 does not easily act on the anchor member 6. Becomes difficult to loosen or come off from the base 2.

  Further, when the amount of bending of the portion 18 in the fixing member 5 increases to a certain extent, the restoring force of the leaf spring 11 of the regulating mechanism 7 starts to act and suppresses bending deformation of each portion 18, and therefore the central axis X of each portion 18. The plastic deformation of the fixing member 5 is less likely to occur at the side portion. For this reason, it becomes the sheet | seat fixing unit 3 with favorable durability.

[Another embodiment]
Hereinafter, another embodiment in which the above embodiment is modified will be exemplified. As long as no contradiction arises, a plurality of other embodiments below can be combined. The scope of the present invention is not limited to the contents shown in each embodiment.

(1) In the said embodiment, although the thing provided only with the leaf | plate spring 11 is illustrated as the control mechanism 7, it is not restricted to this. For example, as shown in FIG. 5, the regulating mechanism 7 may be provided with a spring 20 that presses and urges the leaf spring 11 against the fixing member 5. The spring 20 is interposed between the head 8 of the anchor member 6 and the leaf spring 11. By providing such a spring 20, the leaf spring 11 is prevented from being lifted from the fixing member 5 by the urging force of the spring 20, and the spring force of the leaf spring 11 acts favorably when the fixing member 5 is bent. It becomes. In FIG. 5, a pan screw is illustrated as the anchor member 6.

(2) In the above embodiment, the restriction mechanism 7 is illustrated as having only one leaf spring 11, but is not limited thereto. For example, as shown in FIG. 6, a plurality of leaf springs 11 having different lengths (a plurality of leaf springs 11 having different spring constants) may be provided. In this case, the plurality of leaf springs 11 are arranged so as to overlap each other. As a result, as the bending deformation of the fixing member 5 proceeds, the restoring force of the plate spring 11 sequentially acts on the fixing member 5 in order from the long plate spring 11 to the short plate spring 11. However, it becomes a structure which is hard to reach plastic deformation.

(3) In the above embodiment, the slit 17 has a constant width, but the present invention is not limited to this. For example, as shown in FIG. 7, a hole 21 larger than the width of the slit 17 may be provided at the center side end of the slit 17. By providing such a hole 21, stress generated at the end of the slit 17 on the center axis X side is dispersed in the hole 21, and the fixing member 5 is cracked from the end of the slit 17 on the center axis X side. Can be prevented.

(4) In the said embodiment, although the thing provided with the leaf | plate spring 11 is illustrated as the control mechanism 7, it is not restricted to this. For example, a rib formed on the lower surface of the fixing member 5 may be provided as the restriction mechanism 7. A rib is arrange | positioned so that intensity | strength may become so high that it approaches the center axis X. As shown in FIG. By providing such ribs on the fixing member 5, the center side of the fixing member 5 is less likely to bend and deform than the outer end side. Conversely, a recess that is recessed from the center side may be provided on the outer end side of the lower surface of the fixing member 5. By providing such a recess in the fixing member 5, the center portion side of the fixing member 5 is less likely to bend and deform than the outer end portion side. Further, the fixing member 5 may be provided with both such ribs and recesses.

(5) In the said embodiment, although the waterproof sheet 1 is heat-seal | fused to the junction part 4 of the fixing member 5 with an induction heating apparatus, what has joined the waterproof sheet 1 to the fixing member 5 is illustrated. It is not limited to this. For example, instead of using an induction heating device, an adhesive having adhesiveness or an adhesive that solidifies when dried is applied to the fixing member 5, and the waterproof sheet 1 is attached to the applied layer, whereby the waterproof sheet 1 is attached. You may join to the fixing member 5. When the fixing member 5 and the waterproof sheet 1 are made of the same resin material, a solvent is applied to the fixing member 5 and the fixing member 5 and the waterproof sheet 1 are melted and bonded to each other. The sheet 1 may be joined to the fixing member 5. In this case, the fixing member 5 may be made of another material such as a hard resin having no conductivity instead of the conductive material.

(6) In the above embodiment, the fixing member 5 is formed with the slits 17 formed at equal intervals. However, the present invention is not limited to this. For example, the intervals between the slits 17 in the fixing member 5 may not be equal.

(7) In the above embodiment, the number of the slits 17 formed in the fixing member 5 is six, but the present invention is not limited to this. For example, the number of the slits 17 may be 1 to 5, 7 or more. The number of slits 17 is preferably three or more. For example, when the number of the slits 17 is three, the slits 17 are provided in the fixing member 5 at intervals greater than 90 ° in the circumferential direction.

(8) In the above embodiment, the fixed member 5 has a circular shape as a whole, but is not limited thereto. The overall shape of the fixing member 5 may be various shapes such as a semicircle, an ellipse, and a rectangle.

(9) In the said embodiment, although the concrete foundation | substrate is illustrated as the foundation | substrate 2, it is not restricted to this. For example, another base 2 such as a wood base or a metal base may be used. Further, for example, a material in which a heat insulating material such as polyurethane foam is interposed between the base 2 and the fixing member 5 (a base of an outer heat insulating structure) may be used.

(10) In the above embodiment, the waterproof construction method related to the roof base 2 is illustrated, but the present invention is not limited to this. For example, a waterproofing method related to an indoor base 2 that is easily exposed to water may be used.

  The present invention can be used for a sheet fixing unit that partially fixes a waterproof sheet to a base.

1: Waterproof sheet 2: Base 3: Sheet fixing unit 4: Joint part 5: Fixing member 6: Anchor member 17: Slit 18: Site 21: Hole

Claims (4)

A fixing member for bonding and fixing the waterproof sheet to the bonding portion;
An anchor member that supports a place on the center side with respect to the joint portion of the fixing member to the base, and is provided,
A slit is provided that cuts from the outer end of the fixing member toward the center,
A seat fixing unit in which each part of the fixing member is configured to be able to bend and deform independently from the slit.   The sheet fixing unit according to claim 1, wherein at least three slits are provided.   The sheet fixing unit according to claim 1, wherein a hole portion larger than a width of the slit is provided at a center side end portion of the slit.   The sheet fixing unit according to any one of claims 1 to 3, wherein a width of the slit is smaller than a sheet thickness of the waterproof sheet.

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