JP2019203526A - Fastening tool and fastening tool unit - Google Patents

Abstract

To improve the inside of seat surfaces of a resin-coated bolt and a resin-coated nut so as to raise waterproofness in a state of fastening the resin-coated bolt and the resin-coated nut used for connection of panels in a vapor phase portion of a built-up water tank to the member, and to hardly causes deterioration and corrosion even when they are used under a severe environment.SOLUTION: A plurality of drain ditches extended from a center side toward a peripheral portion of a seat surface, are formed on each of the seat surfaces of a resin-coated bolt obtained by integrally forming a resin coating portion on a head portion of a bolt base material, and a resin-coated nut coated with a resin coating portion at its periphery, so that water intruding from a clearance of a joining portion of the surface of a connected member and the seat surface can be discharged to the outside from the drain ditches.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastener comprising bolts and nuts used as means for connecting panels in an assembled water tank, and a structure in which a steel bolt base material and a nut base material are covered with a synthetic resin material to improve corrosion resistance. Related to things. Further, the present invention relates to a fastener having a seat surface around a screw forming portion such as a bolt or a nut, and discharges water that has entered from between a surface of a member to be fastened and a seat surface pressed against the surface. It relates to a structure having a function.

  Assembly of a water tank is done by connecting unit panels made of synthetic resin with bolts and nuts to form an integral panel wall surface. When water is stored in the assembled water tank, the stored water is stored. The residual chlorine contained in the tank is separated in the tank and stays as chlorine gas in the gas phase part of the water tank. When the concentration of the retained chlorine gas is high, corrosion of the members on the ceiling and side walls surrounding the gas phase part May progress. If the metal bolts and nuts that connect the panels are exposed in the gas phase, the chlorine gas is re-dissolved in the condensed water adhering to the surface, causing corrosion.

  To prevent the bolts and nuts for panel connection in the gas phase part from corroding, after connecting the panels with the bolts and nuts, to prevent moisture and accumulated gas in the gas phase part from touching the bolts and nuts. For example, the cover body that covers the exposed part of the bolt and nut in the gas phase part is attached and fixed, or the exposed part is applied with a waterproof paint or a filler. It is known (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Publication No. 57-193694 JP-A-5-97181

  Waterproofing treatment such as covering the bolts and nuts in the gas phase with a cover body is highly effective in preventing corrosion, but the work of processing the bolts and nuts fastened after connecting the panels is complicated, and the water tank There has been a problem in that the number of work steps for assembling is increased and the manufacturing cost is increased accordingly. Therefore, as an alternative to anti-corrosion measures, resin-coated bolts and resin-coated nuts with corrosion resistance performance are formed by covering the surfaces of the steel bolt base and nut base with a synthetic resin material. A panel connection method has been employed in which the metal parts of the bolts and nuts are prevented from being corroded by being used for connecting the panels facing the part, and the work of applying the waterproofing after the panel connection is omitted.

  However, even when the resin-coated bolt and the resin-coated nut are used to connect the panels facing the gas phase part of the water tank, an event that both members corrode rarely has been confirmed. The reason for the corrosion of the bolt base material is that when the resin-coated bolt is fastened to the panel to be connected, the resin-coated bolt is not sufficiently adhered to the panel. In other words, there is a slight gap at the joint between the seating surface that is the fastening surface and the panel surface, and condensation with high concentration of chlorine gas enters and stays in this gap, and further enters the interior of the resin-coated bolt. It is thought that it came to adhere to a base material. Therefore, in order to suppress the occurrence of corrosion of the resin-coated bolt, it is important to take measures to prevent water that has entered from the joint from adhering to the bolt base material.

In view of such a problem of the prior art, the present invention increases the waterproofness in a state in which a resin-coated bolt and a resin-coated nut used for connecting panels in the gas phase portion of the assembling water tank are fastened to a member. It is an object of the present invention to improve each seating surface so that deterioration and corrosion hardly occur even when used in a severe environment such as a high chlorine gas concentration.
In addition, the present invention applies the improvement of the seating surface to a fastener having a seating surface around a screw forming portion, and when the fastener is attached by pressing the seating surface to the surface of the member, It is an object of the present invention to configure so that water hardly enters the screw forming portion from the joint portion between the surface and the member surface.

  In order to prevent the resin-coated bolt and the resin-coated nut from being corroded in the gas phase part, the present inventor has water from the joint between each seating surface and the surface of the member in a state where these are fastened to a member such as a panel. As a result of earnest research on measures to prevent intrusion, assembling the water tank is done by a method in which the operator manually connects the panels, so when connecting the panels, It is unavoidable that the degree of tightening of the resin-coated nut is excessive and insufficient, and thereby a gap is slightly formed in the joint. If so, even if water enters the joint from the gap, It is possible to prevent the water from staying inside or sticking to the bolt base material or nut base material by providing a discharge path to Was subjected to a degradation test for prototype provided with a drainage path can be confirmed that the corrosion hardly occurs, thereby completing the present invention.

That is, in order to solve the above-mentioned problems, the present invention provides a bolt base material including a shaft portion having a screw threaded on a head portion and a peripheral surface, and a resin coating portion is integrally provided on the entire head portion excluding the shaft portion. In the resin-coated bolt
A plurality of drainage grooves extending from the center side to the peripheral portion are formed on the lower surface portion of the resin coating portion that becomes the seating surface of the resin coating bolt.
Further, the present invention provides a resin-coated nut in which a resin-coated portion is integrally provided on the entire surface except for the inside of the opening portion of the nut base material that is threaded on the inner peripheral surface of the opening portion.
A plurality of drainage grooves extending from the center side to the peripheral portion are formed in the end surface portion of the resin coating portion that becomes the seating surface of the resin coating bolt.

  According to the resin-coated bolt and the resin-coated nut of the present invention, the respective seating surfaces, that is, the lower surface portion of the resin-coated portion of the resin-coated bolt, and the end surface portion of the resin-coated portion of the resin-coated nut from the center side of each surface. Since there are a plurality of drainage grooves reaching the periphery, even if water enters from the gaps formed at the joints between the surface of the member and each seating surface with the bolt and nut fastened to the member, the drainage groove It is possible to prevent the liquid from being discharged to the outside and staying inside. It is possible to effectively prevent the occurrence of corrosion due to water adhering to the bolt base and nut base, which are metal parts, by draining the water that has entered from the joints to the outside through the drainage grooves. .

  In the resin-coated bolt configured as described above, it is preferable that the plurality of drain grooves are arranged radially in the seat surface. Also in the resin-coated nut configured as described above, the plurality of drain grooves are arranged radially in the seat surface. It is preferable to arrange | position.

If the drainage grooves are provided radially in the seating surface, water that has entered the joints with the members from the drainage grooves regardless of the orientation of the resin-coated bolts and resin-coated nuts fastened to the members (posture in the installed state). It can be discharged to the outside. “Radial” here does not mean “extending from the center in all directions”, but “a plurality of drain grooves are formed from the center side of the seating surface of the resin-coated bolt and resin-coated nut toward the periphery. It means "there are you". Each drainage groove is disposed so as to pass through the center of the seat surface when the end on the center side in the seat surface is extended.
The drainage grooves are preferably formed by radially arranging at least 3, preferably 4 or more, in the seating surface.

  In the resin-coated bolt having the above-described configuration, it is preferable that an annular groove is provided in the lower surface portion of the resin-coated portion that is a seat surface, and a drain groove is formed between the annular groove and the peripheral portion of the seat surface. Also, in the resin-coated nut having the above-described structure, an annular groove is provided in the end surface portion of the resin-coated portion which is a seat surface, and a drainage groove is formed between the annular groove and the peripheral portion of the seat surface. Is preferred.

If an annular groove is formed in the seating surface and connected to the annular groove around the annular groove and a drainage groove is provided radially, the water that has entered the joint from the gap of the joint or any drainage groove Can be discharged to the outside from the other drainage groove through the annular groove.
Compared to the case where the inside of the seat surface is divided into an annular shape with an annular groove on the center side, and the outside of the annular groove is divided with a plurality of drainage grooves, and the drainage groove and the annular groove are not formed in the seating surface. Therefore, when the resin-coated bolt or resin-coated nut is fastened to the member surface, the tightening force per unit area of the seating surface is greater than when the drainage groove and the annular groove are not formed. Thus, the entire seating surface including the annular portion can be firmly brought into close contact with the member surface and fastened. Since the annular portion is bonded and adhered to the member with a large clamping force, it is difficult to form a gap between the member surface and the water passing through the annular groove extends beyond the annular portion to the inside. There is no intrusion.

  The resin-coated bolt and the resin-coated nut having the above-described configuration are fastened and fixed by engaging a tightening tool such as a wrench with a part formed in a regular hexagonal column at the end of each resin-coated part, and rotating the tool. Or can be removed by loosening the tightening.

  The resin-coated bolt and the resin-coated nut of the present invention constitute a fastener unit by using together when connecting members such as panels, and the resin-coated bolt between the members from one outer side of the stacked members. Use as a fastener that penetrates the shaft, screws the resin-coated nut onto the shaft protruding outside the other member, and fastens the bolt and nut to the surface of both members to connect the two members. Can do. Further, the resin-coated bolt and the resin-coated nut can be used as independent fasteners, respectively, and a resin-coated bolt and a general-purpose nut can also be used in combination with a general-purpose bolt and a resin-coated nut.

  Moreover, the resin-coated bolt and the resin-coated nut of the present invention can be used for fastening members and bolts and nuts, such as bridges and factory equipment installed outdoors, in addition to applications for connecting panels of assembly-type water tanks. It can also be used as a part for constructing structures that are connected and installed in environments where high corrosion resistance is required.

The drainage function provided on the seat surface of the resin-coated bolt and the resin-coated nut can also be applied to a fastener in which the entire head portion of the bolt base material or the entire surface of the nut base material is not covered with the resin coating portion. .
That is, in a fastener having a seating surface around a screw forming portion such as a shaft portion of a bolt base material or an opening of a nut base material, the seating surface is integrally covered with a resin coating portion, and the resin coating portion is centered on the resin coating portion. By providing a plurality of drainage grooves extending from the side to the periphery, a fastener having a drainage function on the seat surface can be configured.

In the fastener having the above-described configuration, it is preferable that the plurality of drain grooves provided in the resin coating portion covering the seat surface are formed in a radial manner, similarly to the resin-coated bolt and the resin-coated nut. It is preferable that an annular groove is provided in the portion, and the plurality of drainage grooves are formed between the annular groove and the peripheral portion of the resin coating portion.
To integrally cover the seating surface of the fastener with the resin coating portion, in addition to the resin coating portion being integrally molded on the seating surface, the resin coating portion formed separately from the fastener is fixed by adhesion or the like. It can be carried out by attaching to the seat surface using the means, or by attaching the resin coating part formed separately to the seat surface so as to be maintained in a compactly joined state.

According to the fastener of the present invention, since the resin coating portion in which a plurality of drainage grooves are formed is provided so as to overlap the seat surface of the fastener, the surface of the member and the resin coating portion are fastened to the member. Even if water intrudes from the gap formed in the joint part, it can be discharged to the outside through the drainage groove, effectively corroding the screw forming part caused by water entering and staying in the screw forming part It is possible to prevent.
The fastener of the present invention is required to be used in an environment where water can easily enter the screw forming portion in a state where it is fastened to a member, for example, high corrosion resistance such as the above-mentioned bridges, factory equipment, and structures installed outdoors. It is suitable as a part used for fastening a member in an environment.

It is an external view of the resin coating bolt and resin coating nut which comprise the fastener of one Embodiment of this invention. It is the front view, top view, and bottom view of the resin-coated bolt of FIG. It is a longitudinal cross-sectional view of the resin-coated bolt of FIG. It is the front view, top view, and bottom view of the resin-coated nut of FIG. It is a longitudinal cross-sectional view of the resin-coated nut of FIG. It is a principal part expanded sectional view of the connection part when a panel is connected with the fastener of FIG.

  Hereinafter, a preferred embodiment of the resin-coated bolt and the resin-coated nut of the present invention will be described, but the present invention is not limited to this embodiment.

  FIG. 1 shows the appearance of a resin-coated bolt 2 and a resin-coated nut 3 according to an embodiment of the present invention that constitutes a fastener unit 1 when used in combination. Both members are formed by providing resin coating portions 22 and 32 made of a synthetic resin material on the surfaces of a bolt base material 21 and a nut base material 31 made of steel by integral molding.

  Specifically, as shown in FIG. 1 to FIG. 3, the resin-coated bolt 2 has an upper surface on the head 21 a of the bolt base 21 composed of a head 21 a and a shaft 21 b threaded on the peripheral surface. And a resin coating portion 22 that covers the lower surface and the peripheral side surface are integrally provided.

The upper portion 22a of the resin coating portion 22 is formed in a regular hexagonal column shape, and a barrel portion 22b that has a circular cross section on the lower side and projects outward from the flange portion of the head portion 21a of the bolt base material 21. Are connected.
Further, an annular groove 23 concentric with the shaft portion 21b is formed in the lower surface portion 22c of the resin coating portion 22 that covers the lower surface of the head portion 21 of the bolt base material 21, that is, the seat surface of the resin coating bolt 2. Between the annular groove 23 and the peripheral portion of the lower surface portion 22c, twelve drain grooves 24 having one end connected to the annular groove 23 and the other end reaching the peripheral portion are equally spaced from each other. It is formed in a radial arrangement.

  As shown in FIGS. 1, 4, and 5, the resin-coated nut 3 is formed in a cylindrical shape in which one end has a larger diameter than the other end, and the inner peripheral surface of the opening The nut base 31 is formed by integrally providing a resin coating portion 32 that covers the peripheral side surface of the nut base 31 and one opening surface of the opening.

The resin coating portion 32 is provided with a large-diameter portion 32a having a circular cross section projecting outward from a large-diameter peripheral side surface of the nut base 31 on the end side of the nut base 31 on the large-diameter side. The end 32b on the opposite side and covering one opening surface of the opening of the nut base 31 is formed in a regular hexagonal prism shape.
Further, the end surface portion 32c of the large-diameter portion 32a covering the periphery of the opening surface of the nut base material 31, that is, the seating surface of the resin-coated nut 3, has an annular shape concentric with the opening portion of the nut base material 31 in the surface. A groove 33 is formed, and twelve drain grooves 34 having one end connected to the annular groove 33 and the other end reaching the peripheral portion between the annular groove 33 and the peripheral portion of the end face portion 32c are equal to each other. It is formed in a radial arrangement with an interval.

  The resin-coated bolt 2 and the resin-coated nut 3 formed in this way are inserted through the bolts formed respectively in the members 4 and 4 when connecting the members 4 and 4 such as panels as shown in FIG. The members 4, 4 are arranged so that the holes overlap, the shaft portion 21 b of the resin-coated bolt 2 is passed from the outside of one member 4 through the bolt insertion hole, and the shaft portion protruding from the bolt insertion hole of the other member 4 The resin-coated nut 3 is screwed to 21b, and a tightening tool is engaged with the hexagonal cylindrical end portions 22a and 32b of both members or one of the members, and the resin-coated bolt 2 is rotated. The members 4 and 4 are connected together by fastening the lower surface portion 22c of the covering portion 22 and the end surface portion 32c of the resin covering portion 32 which is the seating surface of the resin covering nut 3 to the surfaces of the members 4 and 4, respectively. can do.

  In a state where the members 4 and 4 are connected by the resin-coated bolt 2 and the resin-coated nut 3, a gap is formed between the seating surface of the two members and the surface of the members 4 and 4, and the gap is formed from the gap into the joint. Even if water intrudes, the plurality of drainage grooves 24 and 34 are provided in the respective seating surfaces, so that the intruded water is discharged to the outside through the drainage grooves 24 and 34 and stays in the joint. There is no possibility that the accumulated water adheres to the bolt base material 21 or the nut base material 31 and induces corrosion.

  Further, the plurality of drain grooves 24 and 34 formed in the respective seating surfaces of the resin-coated bolt 2 and the resin-coated nut 3 are both arranged radially, and the ends of the drain grooves 24 and 34 are located in the seat surface. The resin-coated bolt 2 and the resin-coated nut 3 fastened and fixed to the members 4 and 4 are arranged obliquely or laterally with respect to the ground surface. The water that has entered the joint can be reliably discharged to the outside through the drain grooves 24 and 34 and the annular grooves 23 and 33.

  In the illustrated embodiment, the annular grooves 23 and 33 and the drain grooves 24 and 34 are provided in the seating surfaces of the resin-coated bolt 2 and the resin-coated nut 3, but a plurality of grooves are provided without the annular grooves 23 and 33. Even when only the drainage grooves 24 and 34 are provided, the water that has entered through the gap between the joint between the seat surface and the surface of the member 4 is discharged to the outside through the drainage grooves 24 and 34 and stays in the joint. It is possible to prevent adhesion to the base material 21 and the nut base material 31.

The illustrated resin-coated bolt 2 and resin-coated nut 3 are examples of the present invention, and the present invention is not limited to the illustrated embodiments, and can be configured in other appropriate forms.
In addition to the resin-coated bolt 2 and the resin-coated nut 3, the seat surface of the fastener having a seat surface around the screw forming portion such as the shaft portion of the bolt base or the opening of the nut base is resinized. Covering integrally with the covering part, and providing a plurality of drainage grooves extending from the center side to the peripheral part in the resin covering part, the fastener of the present invention having a drainage function on the seat surface is configured, and this is corrosion resistant. It may be used as a part used for fastening a member in an environment where the above is required.

DESCRIPTION OF SYMBOLS 1 Fastener unit, 2 Resin coated bolt, 21 Bolt base material, 21a Head, 21b Shaft part, 22 Resin coating part, 22a Upper part, 22b Body part, 22c Lower surface part, 23 Annular groove, 24 Drainage groove, 3 Resin coating Nut, 31 Nut base material, 32 Resin coating part, 32a Large diameter part, 32b End part, 32c End surface part, 33 Annular groove, 34 Drainage groove, 4 Member to be connected

Claims (6)

  A fastener having a seating surface around a screw forming portion, wherein the seating surface is covered with a resin coating portion, wherein a plurality of drain grooves extending from the center side to the peripheral portion are formed in the resin coating portion. The fastener characterized by being made.   The fastener according to claim 1, wherein the plurality of drain grooves are arranged radially.   The fastener according to claim 1 or 2, wherein an annular groove is provided in the resin coating portion, and a drainage groove is formed between the annular groove and a peripheral portion of the resin coating portion.   The fastener according to any one of claims 1 to 3, wherein the entire head portion excluding the shaft portion of the bolt base member including the head portion and a shaft portion in which a screw is cut on a peripheral surface is resin-coated. Resin-coated bolt that is covered with a part.   The fastener according to any one of claims 1 to 3, wherein the entire surface of the nut base member formed by screwing the inner peripheral surface of the opening portion except for the opening portion is covered with a resin coating portion. Resin-coated nut.   A fastener unit comprising the resin-coated bolt according to claim 4 and the resin-coated nut according to claim 5.