JP7065510B2 - Bis unit - Google Patents

Description

The present invention relates to a screw unit used for a metal waterproof base.

Conventionally, as a method of fixing a waterproof sheet to a metal waterproof base (folded plate roof, deck plate, etc.), as in Patent Document 1, first, a disc-shaped fixture is fixed to the waterproof base with screws, and then A construction method in which a waterproof sheet is laid on the waterproof base and the fixture, the molten layer on the upper surface of the fixture is melted from the upper surface of the waterproof sheet using an induction heating device, and the upper surface of the fixture and the back surface of the waterproof sheet are fixed. Etc. are adopted.

Japanese Unexamined Patent Publication No. 2017-12230

By the way, since the wind is blowing on the rooftop, etc., the waterproof sheet flutters due to the lift caused by the wind, so-called fluttering occurs, and the fixture is shaken following the fluttering of the waterproof sheet, and the screws are the center. May try to rotate as. Then, in the conventional technique, since the fixture is fixed to the waterproof base by the force of screwing the screw into the waterproof base, the screw is screwed into the metal base as a fulcrum due to the shaking or rotation of the fixture. It flutters or rotates. When this phenomenon is repeated, the screw penetration points in the waterproof base are expanded or the screws are loosened. As a result, the screw head may protrude from the fixture and the waterproof sheet may be torn, or the screw may come off the waterproof base and the fixture may be unfixed.

On the other hand, if a screw unit (so-called board anchor) that buckles the sheath tube on the outer peripheral side radially outward by rotating the screw on the inner peripheral side is used, the locking force of the screw on the waterproof base is used. Can be enhanced. However, with such a screw unit, first a through hole for dropping the screw unit is made on the back side of the waterproof base, and then the work of locking the screw unit to the waterproof base is performed, and the tool is used. It takes time to change hands.

In view of the above circumstances, there is a demand for a screw unit that has a high locking force to a metal waterproof base and does not require much construction work.

The screw unit used for the metal waterproof base according to the present invention is
A screw member to be drilled in the waterproof base and
A tubular sheath tube member that is shorter than the screw member and wraps the screw member from the outside in the radial direction is provided.
A through hole having a diameter larger than the outer diameter of the sheath tube member can be drilled in the waterproof base at the tip of the screw member on the opposite side of the screw head so as to protrude from the sheath tube member. A first screw portion is provided, and a second screw portion having a diameter smaller than that of the first screw portion is provided on a portion of the screw member on the screw head side of the first screw portion.
An internal threaded portion screwing with the second threaded portion is provided on the inner peripheral portion of the portion of the sheath tube member corresponding to the second threaded portion.
A buckling promoting portion that promotes buckling in the axial core direction rather than shearing in the circumferential direction is provided on the portion of the sheath tube member on the side of the screw head side from the portion where the internal thread portion is formed. It is characterized by that.

In the present invention, when the screw unit is set and the screw member is started to be screwed in, a through hole having an inner diameter larger than the outer diameter of the sheath tube member is drilled by the first screw portion, and then the tip side portion of the screw unit is formed. Will fall into the through hole and escape to the back side of the waterproof base. When the sheath tube member is held so as not to rotate with the screw member and the screw member is further screwed in, the screw head and the sheath tube member come into contact with each other in the axial direction of the screw member and the sheath tube member. When the relative movement is blocked and the screw member is continuously screwed in that state, the screwing force between the internal screw part and the second screw part (the force that the internal screw part tries to screw toward the screw head side) is applied. It is converted into axial force, and the portion of the sheath tube member that has come out to the back side of the waterproof base is buckled and crushed outward in the radial direction, has a larger diameter than the through hole, and is locked to the waterproof base. As a result, the fixture and the waterproof base are strongly sandwiched between the screw head and the crushed portion of the sheath tube member, and the sheath tube member does not come out of the through hole.

As described above, according to the present invention, a series of operations from drilling into the waterproof base to locking the sheath tube member to the waterproof base can be performed by simply continuing to screw in the screw member, and fluttering can be performed. Even if it does occur, the screw unit will not come loose or come off the waterproof base. That is, according to the present invention, it is possible to realize a screw unit having a high locking force on a metal waterproof base and which does not require much construction work.

In the present invention
A shaft portion having a diameter smaller than that of the second screw portion is provided between the first screw portion and the second screw portion of the screw member in a state where no screw is formed.
The length of the end portion of the sheath tube member including the internal thread portion in the axial core direction is set shorter than the length of the shaft portion in the axial core direction.
In the initial state of the screw member and the sheath tube member, it is preferable that the end portion is fitted into a step formed by the shaft portion of the screw member to wrap the shaft portion from the radial outside. Is.

In view of the configuration of the present invention, since the first screw portion has a larger diameter than the internal screw portion, the screw unit cannot be assembled by screwing the screw member and the sheath tube member. The screw unit needs to be assembled so as to wrap the sheath tube member with respect to the screw member from the outer diameter side. In this case, in order to set the screw member and the sheath tube member so that the internal screw portion and the second screw portion are screwed in the initial state, a high-precision assembly technique is required.

However, according to this configuration, the end portion of the sheath tube member including the internal screw portion may be fitted into the step formed by the shaft portion without the screw, and the assembly work of the screw unit becomes easy. Further, since the screw member and the sheath tube member are relatively rotatable in the rotation direction until the tip of the screw unit falls into the through hole and the second screw portion and the inner screw portion start to be screwed, the first screw It is possible to prevent the rotational force of the screw member from acting on the sheath tube member when drilling into the waterproof base by the portion, and it is possible to prevent the sheath tube member from unexpectedly deforming such as buckling. , It can be a screw unit with few malfunctions.

In the present invention
It is preferable that the sheath tube member is provided with a locking portion that is locked to the waterproof base to prevent rotation.

Generally, when a metal plate is drilled with a screw, the outer peripheral portion of the through hole has a shape with jagged irregularities. According to this configuration, since the locking portion is provided on the outer peripheral portion of the sheath tube member, the locking portion is locked to the outer peripheral portion of the through hole simply by dropping the sheath tube member into the through hole, which is a special cure. The sheath tube member can be prevented from rotating without the need for tools, and the normal operation of the screw unit can be ensured with a simple configuration. That is, according to this configuration, taking advantage of the fact that the waterproof base is made of metal, a locked portion is formed in the waterproof base by drilling with the first screw portion, and the sheath tube member can be easily prevented from rotating in a series of flows. Can be realized.

In the present invention
The sheath tube member is made of a metal material and is made of a metal material.
It is preferable that the buckling promoting portion is a plurality of slits formed in the sheath tube member so as to extend along the axial core direction in a state of being spaced apart in the circumferential direction.

According to this configuration, since the sheath tube member is made of a metal material, the durability of locking to the waterproof base can be ensured, and the simple configuration of forming a plurality of slits in the sheath tube member makes it more resistant to buckling. The buckling resistance can be reduced, and the buckling resistance can be set or changed relatively easily depending on the width, length and number of slits, and screw units with different specifications are manufactured according to the work environment. Cheap.

It is an overall side view of the screw unit of this invention. It is an overall side view of a screw member. It is the whole side view of the sheath tube member. It is a rooftop vertical sectional side view which shows the state which set the screw unit and the fixture. It is a rooftop longitudinal side view showing a state where the screw unit has fallen into the through hole. It is a rooftop longitudinal side view showing a state in which a screw member is completely screwed into a sheath tube member. It is a rooftop longitudinal side view showing a state in which a sheath tube member buckles, spreads outward in the radial direction, is crushed, and is locked to a waterproof base. It is a rooftop longitudinal side view showing a state where a screw unit is used for another fixture.

Hereinafter, embodiments that are an example of the present invention will be described with reference to the drawings. As shown in FIGS. 4 to 7, the screw unit 1 according to the present invention has, for example, a waterproof sheet S made of a synthetic resin such as vinyl chloride on a rooftop or a roof, and a metal such as a folded plate roof or a deck plate. It is used when installing on the waterproof base B made of. In the present embodiment, a waterproof structure by a heat insulating method in which a heat insulating material C such as a rigid urethane foam is installed on the waterproof base B and a waterproof sheet S is installed on the heat insulating material C will be described as an example.

[About the screw unit]
The screw unit 1 includes a metal screw member 2 and a thin-walled cylindrical (cylindrical example) metal sheath tube member 3 that wraps the screw member 2 from the outside in the radial direction. The screw member 2 is perforated in the waterproof base B, and the sheath tube member 3 buckles outward in the radial direction and is locked to the waterproof base B.

[About screw members]
As shown in FIG. 2, the screw member 2 has a first screw portion 21 formed at the tip portion on the screwing side and a shaft portion 22 adjacent to the screw head portion 25 with respect to the first screw portion 21. , A second screw portion 23 adjacent to the side of the screw head 25 with respect to the shaft portion 22 is provided. A wrench hole 26 (polygonal shape) into which a tool such as an impact driver can be engaged is formed in the screw head 25.

The first screw portion 21 is a drill screw having a drill portion 24 at the tip portion, and the first screw portion 21 can drill a through hole A having a diameter larger than the outer diameter PR1 of the sheath tube member 3 in the waterproof base B. be. The shaft portion 22 is a cylindrical portion in which no screw is formed, and is formed closer to the tip end portion side of the screw member 2. The second screw portion 23 occupies most of the screw member 2 and reaches the screw head 25. A screw having a smaller lead angle than that of the first screw portion 21 is formed on the outer peripheral portion of the second screw portion 23. The outer diameter DR2 of the second screw portion 23 is set smaller than the outer diameter DR1 of the first screw portion 21, and the outer diameter of the shaft portion 22 is set smaller than the outer diameter DR2 of the second screw portion 23. A step is formed between the first screw portion 21 and the second screw portion 23 by the portion 22.

In the present embodiment, the length La1 of the first screw portion 21, the length La2 of the shaft portion 22, and the length La3 of the second screw portion 23 are set so that La2 <La1 <La3.

[About sheath tube members]
As shown in FIG. 3, the sheath tube member 3 has an internal screw portion 31 formed at the tip portion on the screwing side and a screw formed on the inner peripheral portion, and the screw member 2 with respect to the internal screw portion 31. A tubular portion 32 adjacent to the side corresponding to the screw head 25 and a tubular head 33 formed at an end portion on the opposite side to the tip portion on the screwing side are provided. The tubular portion 32 corresponds to the "portion on the side of the screw head side from the portion of the sheath tube member on which the internal thread portion is formed" in the present invention.

The internal thread portion 31 is started to be formed from the edge portion of the sheath tube member 3. The screw formed in the internal screw portion 31 is configured to be screwed with the screw of the second screw portion 23. The tubular portion 32 occupies most of the sheath tube member 3, and reaches the tubular head 33. No screw is formed on the inner peripheral portion of the tubular portion 32. The inner diameter PR3 of the tubular portion 32 is set to be larger than the inner diameter PR2 of the internal thread portion 31. The cylinder head 33 has a trumpet-shaped shape that follows the shape of the screw head 25, and when the screw member 2 is inserted into the sheath tube member 3 until the screw head 25 abuts on the cylinder head 33, the screw member 2 is inserted. Can no longer be inserted into the sheath tube member 3.

In the present embodiment, the length Lb1 of the internal thread portion 31 and the length Lb2 of the tubular portion 32 are set so that Lb1 <Lb2. Further, the length LB1 of the internal thread portion 31 is set to be equal to or less than the length La2 of the shaft portion 22. In the present embodiment, the length LB1 of the internal thread portion 31 is set to be the same as or slightly shorter than the length La2 of the shaft portion 22.

A plurality of slits 34 are formed on the outer peripheral portion of the tubular portion 32 so as to extend along the axis direction with a gap in the circumferential direction. In the present embodiment, four slits 34 are formed every 90 degrees in the circumferential direction. The slit 34 extends from a position close to the internal thread portion 31 to most of the tubular portion 32, but does not extend to the vicinity of the tubular head 33. Round holes having a diameter larger than the width of the slit 34 are formed at both ends and the middle portion of the slit 34. By forming the slit 34, the buckling resistance of the portion 32a of the sheath tube member 3 in which the slit 34 is formed is reduced. The slit 34 promotes buckling in the axial direction rather than shearing in the circumferential direction, and corresponds to the "buckling promoting portion" of the present invention.

Although not shown, a locking portion that partially protrudes outward in the radial direction is formed on the outer peripheral portion of the tubular portion 32. When the metal waterproof base B is drilled with the first screw portion, the edge portion of the through hole A tends to have a shape having jagged irregularities, and the locking portion can be locked to the through hole A.

[About the initial state of the screw unit]
As shown in FIGS. 1 and 4, in the state where the sheath tube member 3 is set on the screw member 2 (initial state), among the screw members 2, the first screw portion 21, the screw head 25, and the second screw A portion of the portion 23 on the side of the screw head 25 protrudes from both edges in the axial core direction of the sheath tube member 3 (edge of the internal thread portion 31, cylinder head 33). As described above, the length LB of the sheath tube member 3 (see FIG. 3) is set shorter than the length LA of the screw member 2 (see FIG. 2). In the initial state, the screw head 25 is separated from the cylinder head 33, and the separation distance between the screw head 25 and the cylinder head 33 in the axial center direction in the initial state is h (see FIG. 4).

Further, in the initial state, the second screw portion 23 is housed in the inner circumference of the cylinder portion 32, the inner screw portion 31 is located at the step formed by the shaft portion 22, and the second screw portion 23 and the inner screw portion are formed. It is not screwed with 31. That is, in a state where the relative rotation of the sheath tube member 3 with respect to the screw member 2 is prevented, the screw end of the end portion (lower end portion in FIG. 4) of the second screw portion 23 is the end portion of the internal screw portion 31 (FIG. 4). In No. 4, the second screw portion 23 and the internal screw portion 31 start to be screwed only when they are locked to the screw end of the upper end portion).

Due to the above-mentioned configuration, the screw member 2 cannot be inserted into the sheath tube member 3 along the axial core direction. Therefore, for example, a configuration is adopted in which the sheath tube member 3 is made of a plate-like body, wound around the screw member 2, and the wound ends are joined to each other. At that time, if a boundary portion is provided on the extension line portion of the slit 34, the joint length can be shortened. As for the manufacturing method of exteriorizing the sheath tube member 3 to the screw member 2, various manufacturing methods can be considered.

[Usage for screw unit]
First, a roof structure in which the waterproof sheet S is installed, a fixture D for fixing the waterproof sheet S to the waterproof base B, and the like will be described.

As shown in FIGS. 4 to 7, a heat insulating material C is laid on the waterproof base B. Then, a disk-shaped and metal fixture D is arranged on the heat insulating material C. An adhesive layer such as a vinyl chloride coating or a hot melt layer is provided on the upper surface of the fixture D. An opening is formed in the center of the fixture D, and a tubular resin washer TW is inserted and engaged with the opening. The washer TW may be manually inserted into the heat insulating material C, or may be inserted into a hole previously drilled at a desired position in the heat insulating material C. The screw unit 1 is inserted inside the washer TW, and the tip portion thereof is fastened to the waterproof base B. As a result, the fixing tool D is fixed to the waterproof base B, and the heat insulating material C is also pressed by the fixing tool D and fixed to the waterproof base B. Then, as shown in FIG. 7, the waterproof sheet S is laid on the fixture D and the heat insulating material C. After that, the induction heating device is pressed from above against the portion of the waterproof sheet S located directly above the fixing tool D, the fixing tool D is induced and heated by the induction heating device, and the adhesive layer of the fixing tool D and the waterproof sheet are heated. The back surface of S is fused.

Since the washer TW is made of resin, the coefficient of friction at the engagement portion with the fixture D becomes small, and even if the waterproof sheet S undulates due to fluttering, it becomes difficult for the washer TW to rotate with the fixture D. As a result, it is possible to prevent the screw unit 1 that fastens the washer TW from rotating with the fixture D.

Subsequently, with reference to FIGS. 4 to 7, the work flow of fixing the fixture D on which the washer TW is set by the screw unit 1 to the waterproof base B will be described.

As shown in FIG. 4, when the screw unit 1 is inserted into the washer TW and the screw member 2 is rotated while being pressed downward by a tool, the drill portion 24 begins to scrape the waterproof base B, a hole is opened, and the first screw portion is formed. The hole is widened by the screw of 21, and as a result, the through hole A is drilled in the waterproof base B. At this stage, the screw member 2 and the sheath tube member 3 do not rotate.

When the through hole A is opened, the through hole A has a larger diameter than the sheath tube member 3. Therefore, as shown in FIG. 5, the screw unit 1 (both the screw member 2 and the sheath tube member 3) is pushed by the pushing force of the tool. ) Drops into the back side (indoor side) of the waterproof base B at once until the position (level H1) where the cylinder head 33 abuts on the throttle portion at the tip of the washer TW. At this time, a part of the portion 32a of the tubular portion 32 on which the slit 34 was formed fell to the back side of the waterproof base B and was provided on the outer peripheral portion of the sheath tube member 3. The locking portion is locked to the through hole A, and the sheath tube member 3 is prevented from rotating.

Then, when the screw member 2 is further rotated by the tool, the sheath tube member 3 is prevented from rotating. Therefore, as shown in FIG. 6, the second screw portion starts to be screwed into the inner screw portion, and the screw head 25 The screw member 2 is screwed up to a position (level H2) where the screw member 2 abuts on the cylinder head 33. The height position of the sheath tube member 3 remains maintained. The distance (H2-H1) in which the screw member 2 is screwed is equal to the distance h between the screw head 25 and the cylinder head 33 in the initial state (state of FIG. 4). Further, in the present embodiment, in the state of FIG. 6, the lower end portion of the second screw portion 23 and the lower end portion of the inner screw portion 31 are at the same position, and the shaft portion 22 is completely below the sheath tube member 3. Is exposed to. That is, the length La2 of the shaft portion 22 and the length LB1 of the internal thread portion 31 are equal to the distance h.

Further, when the screw member 2 is further rotated by the tool from this state, the screw head 25 comes into contact with the cylinder head 33 so that the screw member 2 cannot be screwed and the sheath tube member 3 does not rotate. Since it is held, the screwing force between the internal screw portion 31 and the second screw portion 23 (the force with which the internal screw portion 31 is screwed toward the screw head 25 side) is converted into an axial force. Then, due to the action of the slit 34, as shown in FIG. 7, in the portion 32a of the sheath tube member 3 where the slit 34 is formed, the portion protruding to the back side of the waterproof base B buckles and presses outward in the radial direction. It is crushed, has a larger diameter than the through hole A, and is locked to the waterproof base B. As a result, the fixing tool D and the waterproof base B are strongly sandwiched between the screw head 25 and the crushed portion of the sheath tube member 3, and the sheath tube member 3 comes out of the through hole A. Is gone.

[Another Embodiment]
Hereinafter, another embodiment in which the above embodiment is modified will be illustrated. The following alternative embodiments may be applied to the above embodiment in combination as long as there is no contradiction. The scope of the present invention is not limited to the contents of each embodiment.

(1) In the above embodiment, an example in which a washer TW is interposed between the fixture D and the screw unit 1 is shown, but the present invention is not limited to this. For example, as shown in FIG. 8, the fixture D may be directly fixed to the waterproof base B by the screw unit 1 without using the washer TW.

(2) In the above embodiment, an example is shown in which the shaft portion 22 and the internal thread portion 31 have substantially the same length, but the present invention is not limited to this. For example, the internal thread portion 31 may be configured to be considerably shorter than the shaft portion 22.

(3) In the above embodiment, an example is shown in which the screw member 2 is provided with the shaft portion 22 in the initial state of the screw unit 1 so that the shaft portion 22 is wrapped by the internal screw portion 31. It is not limited to. For example, the screw member 2 may not be provided with the shaft portion 22, and the internal screw portion 31 may be configured to be screwed to the second screw portion 23 in the initial state.

(4) In the above embodiment, an example is shown in which the internal thread portion 31 reaches the tip end portion (lower edge portion) of the sheath tube member 3, but the present invention is not limited to this. For example, a portion on which no screw is formed may be provided on the tip end side of the internal screw portion 31.

(5) In the above embodiment, in the screw member 2, the second screw portion 23 is extended to the screw head 25, but the second screw portion 23 does not use all of them. Therefore, the length may be shorter, and a screwless portion may be formed between the second screw portion 23 and the screw head 25.

(6) In the above embodiment, the slit 34 provided on the outer peripheral portion of the tubular portion 32 is exemplified as the buckling promoting portion, but the present invention is not limited to this. It is also possible to promote buckling in the axial direction rather than shearing in the circumferential direction by partially changing the wall thickness in the tubular portion 32.

The present invention is applicable not only when the waterproof sheet S is applied to the metal waterproof base B on the roof or roof, but also when the waterproof sheet S is applied to the metal waterproof base B on the wall. ..

1 Screw unit 2 Screw member 3 Sheath tube member 21 First threaded part 22 Shaft part 23 Second threaded part 25 Screw head 31 Internal threaded part 32 Cylindrical part (more screw than the part where the internal threaded part is formed in the sheath tube member The part on the side of the head)
34 Slit (buckling promotion part)
A through hole B waterproof base

Claims (4)

A screw unit used for a metal waterproof base,
A screw member to be drilled in the waterproof base and
A tubular sheath tube member that is shorter than the screw member and wraps the screw member from the outside in the radial direction is provided.
A through hole having a diameter larger than the outer diameter of the sheath tube member can be drilled in the waterproof base at the tip of the screw member on the opposite side of the screw head so as to protrude from the sheath tube member. A first screw portion is provided, and a second screw portion having a diameter smaller than that of the first screw portion is provided on a portion of the screw member on the screw head side of the first screw portion.
An internal threaded portion screwing with the second threaded portion is provided on the inner peripheral portion of the portion of the sheath tube member corresponding to the second threaded portion.
A buckling promoting portion that promotes buckling in the axial core direction rather than shearing in the circumferential direction is provided on the portion of the sheath tube member on the side of the screw head side from the portion where the internal thread portion is formed. Screw unit. A shaft portion having a diameter smaller than that of the second screw portion is provided between the first screw portion and the second screw portion of the screw member in a state where no screw is formed.
The length of the end portion of the sheath tube member including the internal thread portion in the axial core direction is set shorter than the length of the shaft portion in the axial core direction.
A claim that the end portion of the screw member and the sheath tube member is fitted into a step formed by the shaft portion of the screw member and wraps the shaft portion from the radial outside. The screw unit according to 1. The screw unit according to claim 1 or 2, wherein the sheath tube member is provided with a locking portion that is locked to the waterproof base to prevent rotation. The sheath tube member is made of a metal material and is made of a metal material.
The invention according to any one of claims 1 to 3, wherein the buckling promoting portion is a plurality of slits formed in the sheath tube member so as to extend along the axial core direction in a state of being spaced apart in the circumferential direction. Screw unit.

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