JP2016179614A - Clogging cap and clogging structure and clogging method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clogging cap capable of simply and sufficiently clogging an aperture formed on a structure consisting of a thermoplastic resin molded body or the like by using a general purpose rotary tool or the like without using a special machine, and a clogging structure and a clogging method using the same.SOLUTION: By a rotation friction pressure welding for pushing to inside of an injection hole 3 while rolling a shaft body 4 with status where a tip side shaft part 5 of the shaft body 4 is injected into the injection hole 3 and a melting margin part 9 is contacted with circumference of the injection hole 3, the melting margin part 9 is molten by friction heat with the circumference of the injection hole 3 and a collar part 11 contacts with an inner member 2 when the shaft body 4 is pushed with a predetermined distance equal to a gap S1 to the injection hole 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sealing cap made of a thermoplastic resin that closes an opening of a structure made of a thermoplastic resin molded body and the like, and a closing structure and a closing method using the same, and in particular, the opening by welding by rotational friction welding. The present invention relates to a closure cap for closing a container, and a closure structure and a closure method using the same.

  As an example of a method for repairing an aged existing pipe, a hollow frame-shaped reinforcing material is arranged along the inner peripheral surface of the existing pipe, and a plurality of inner surfaces made of thermoplastic resin are arranged inside the reinforcing material. The cylinder is continuously attached in the circumferential direction and assembled into a cylinder. The inner member assembled in this cylinder is used as a rehabilitation pipe, and a filler such as mortar is filled between the rehabilitation pipe and the existing pipe. There is.

In filling the filler, a circular injection hole is formed in the inner surface member constituting the rehabilitation pipe, and the filler is injected between the rehabilitation pipe and the existing pipe through the injection hole.
If the injection of the filler is completed, the injection hole becomes unnecessary, and it is necessary to close the injection hole.

Conventionally, as a method for closing the injection hole, for example, a plug that can be screwed into the injection hole, a cap that can be fitted into the injection hole, a sheet that can cover the injection hole, or the like is known.
In the case of using a plug, a sealing agent is applied to the thread of the plug, and the plug is screwed into the injection hole using a tool such as a screwdriver. In the case of using a cap, a cap applied with a sealing agent is used as the injection hole. When the sheet is used, the sheet is attached to the inner surface member with an adhesive so as to cover the injection hole.

  However, in the conventional closing method using a sealing agent or an adhesive, it is necessary to select a type of sealing agent or an adhesive depending on the materials to be joined. Selection of the sealing agent to be used is required to obtain a strong joint strength. In addition, there is a problem that specialized knowledge is indispensable for construction, and it is necessary to take a long curing period after construction.

  Thus, for example, Patent Documents 1 and 2 have proposed that the opening is closed without using a sealing agent or the like.

JP, 2014-162067, A Japanese Patent No. 4128484

Patent Document 1 discloses a structure relating to a joining structure of resin members. A cylinder portion of an oil filter bracket made of a polyamide resin and a stopper plug made of a polyamide resin are joined by vibration welding to form a cylinder. A technique is disclosed in which a part is closed with a stopper plug.
Patent Document 2 describes a technique related to a technique of filling a through hole formed in a thermoplastic resin molded body with a plug made of a thermoplastic resin, and is directed outward with respect to a peripheral portion of the through hole. A funnel-shaped enlarged diameter part that expands in diameter is formed by a rotary cutting blade, and the enlarged diameter part and the plug body are joined by welding by rotary friction welding that presses the plug body while rotating the formed diameter part. A technique is disclosed in which a through hole is closed with a plug.

However, in the one described in Patent Document 1, a special machine such as a vibration welding machine having a configuration capable of applying resonance vibration or mechanical vibration in a state in which a stopper plug is pressurized against the cylindrical portion. There is a problem that the application range is limited, and it is difficult to apply to the use of the clogging treatment at the construction site of existing pipe repair, for example.
Moreover, in the thing of patent document 2, before performing the rotational friction welding of the plug body with respect to the peripheral part of a through-hole, the funnel-shaped enlarged diameter part must be previously formed in the peripheral part of a through-hole, and man-hours are required. Therefore, there is a problem that the construction efficiency is poor.

  In view of the above-described problems of the prior art, the present invention can easily and efficiently use a general-purpose rotary tool or the like for an opening formed in a structure made of a thermoplastic resin molded body or the like without using a special machine. An object of the present invention is to provide a closing cap that can be closed, a closing structure using the same, and a closing method.

  In order to achieve the above object, a closing cap according to a first invention is a closing cap for closing an opening formed in a structure, and has a fusion margin having an outer diameter larger than the inner diameter of the opening. A shaft body that has a proximal end side shaft portion and a distal end side shaft portion that is integrally provided on the distal end side of the proximal end side shaft portion and is rotatably inserted into the opening; and When the distal end side shaft portion is inserted into the opening portion and the fusion margin is in contact with the periphery of the opening portion, it is provided integrally with the proximal end side shaft portion so as to leave a gap with the structure. Rotating friction welding that pushes the shaft body into the opening while rotating the shaft body in a state where the shaft portion on the tip side of the shaft body is inserted into the opening portion and the melting margin is in contact with the peripheral edge of the opening portion Thus, the melting margin is melted by frictional heat with the periphery of the opening.

  In this case, the structure which provides the rotational power receiving part for receiving the rotational power from a rotary tool in the base end side of a shaft body is employable (2nd invention).

  Next, a closing structure according to a third invention is a closing structure in which an opening formed in a structure made of a thermoplastic resin molded body is closed using the closing cap according to the first invention or the second invention. Rotating friction pressure welding that pushes into the back of the opening while rotating the shaft body of the closing cap while the melting margin of the closing cap is in contact with the peripheral edge of the opening. The structure and the closing cap are joined to each other through a welded portion formed by performing the process until it comes into contact with the body.

  Next, a closing method according to a fourth invention is a closing method for closing an opening formed in a structure made of a thermoplastic resin molded body using the closing cap according to the first invention or the second invention. Then, the shaft portion on the front end side of the closing cap is inserted into the opening portion, the melting margin of the closing cap is brought into contact with the peripheral edge of the opening portion, and then rotational power is applied to the shaft body of the closing cap to provide the shaft body. The rotation cap is pushed into the back of the opening, and after the collar portion of the closing cap is brought into contact with the structure, the application of rotational power to the shaft body of the closing cap is stopped.

In the closing cap and the closing structure and closing method using the same according to the present invention, the melting margin of the closing cap is in contact with the periphery of the opening formed in the structure such as a thermoplastic resin molded body. The closing cap is welded to the structure by rotating friction welding that is pushed into the opening while rotating the shaft body of the closing cap.
For this reason, the closing operation of the opening can be easily performed using a general-purpose rotary tool or the like that can apply rotational power to the shaft body of the closing cap.

At the time of rotational friction welding in the above-described closing operation, the distal end side shaft portion of the closing cap inserted into the opening portion is rotated within the opening portion, so that the distal end side shaft portion inserted into the opening portion is rotated during the rotational movement. It can serve as a mandrel to prevent the closing cap from being displaced relative to the opening and to stabilize the rotational movement.
Further, at the time of rotational friction welding in the above-described closing operation, the shaft body of the closing cap is pushed into the opening by a predetermined distance, and the flange portion of the closing cap contacts the structure made of a thermoplastic resin molded body or the like. If this is done, the contact area of the closing cap with respect to the structure will increase abruptly, so that a frictional force that stops the rotation of the closing cap will work, and the melting margin will be completely melted and welding will be completed. The operator can easily recognize it, and the movement of the closing cap in the pushing direction can be stopped by the collar so that the closing cap is not pushed further into the opening. It is possible to prevent the penetration through the opening.
In addition, when performing the above-described closing operation, for example, a pretreatment required in the technique according to Patent Document 2, that is, a special pretreatment such as forming a funnel-shaped enlarged diameter portion in the peripheral portion of the through hole in advance. Is not necessary, and the flange of the closing cap is turned into a structure such as a thermoplastic resin molding while rotating the shaft body of the closing cap while the melting margin of the closing cap is in contact with the periphery of the opening. The structure and the closing cap can be easily joined simply by pushing the closing cap into the back of the opening until contact is made.

  Therefore, according to the closing cap and the closing structure and closing method using the same according to the present invention, the general-purpose rotary tool can be used without using a special machine for the opening formed in the structure made of a thermoplastic resin molded body or the like. Etc., and can be easily and efficiently closed.

  Here, by adopting a configuration in which a rotational power receiving portion for receiving rotational power from the rotary tool is provided on the base end side of the shaft body, the closing operation can be performed more efficiently using the rotary tool.

It is a figure which shows the closure cap concerning the 1st Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a bottom view. It is a figure which shows the rotational friction welding using the cap for closure of 1st Embodiment, (a) is a state figure in which the cap for closure was inserted in the injection hole, (b) is the fusion | melting margin part and injection | pouring of the cap for closure It is a state figure by which the hole peripheral part was welded. It is a figure which shows the closure cap concerning the 2nd Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a bottom view. It is a figure which shows the cap for closure concerning the 3rd Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a bottom view. It is a figure which shows the closure cap concerning the 4th Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a bottom view. It is a figure which shows the closure cap which concerns on the 5th Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a bottom view. It is a figure which shows the rotational friction welding using the cap for closure of 5th Embodiment, (a) is a state figure in which the cap for closure was inserted in the injection hole, (b) is the fusion | melting margin part and injection | pouring of the cap for closure It is a state figure by which the hole peripheral part was welded.

  Next, an embodiment of a closure cap of the present invention, and a closure structure and a closure method using the same will be described with reference to the drawings.

[First Embodiment]
<Outline explanation of cap for closure>
1 (a), (b) and (c) and FIG. 2 (a), the closing cap 1 is a strip having a predetermined thickness extending long in a direction perpendicularly penetrating the paper surface of FIG. 2 (a). This is a member made of a thermoplastic resin for closing the circular injection hole 3 formed in the inner surface member 2, and includes a shaft body 4 made of a hollow shaft-shaped member having a cylindrical cross section.
Here, the inner surface member 2 is a thermoplastic resin member that constitutes a rehabilitation pipe for repairing an existing pipe, and corresponds to a “structure (made of a thermoplastic resin molded body or the like)” of the present invention.
The injection hole 3 is provided to inject a filler such as mortar between the existing pipe and the rehabilitation pipe, and corresponds to the “opening” of the present invention.

<Description of shaft>
As shown in FIG. 2A, the shaft body 4 is set to a predetermined length dimension that can be inserted so as to penetrate the injection hole 3, and includes a distal end side shaft portion 5 located on the distal end side and a proximal end side. The proximal end side shaft portion 6 is integrally formed.
The distal end side shaft portion 5 has a leading portion 7 formed in a cylindrical shape with a constant outer diameter dimension slightly smaller than the inner diameter size of the injection hole 3 over the entire area in the axial direction, and a proximal end side of the leading portion 7. It has an engaging portion 8 that is integrally formed and engages with the periphery of the injection hole 3.
The proximal end side shaft portion 6 is formed in a tapered cylindrical shape having an outer diameter that increases from the distal end position toward the proximal end position, and has a fusion margin 9 on the outer peripheral portion thereof.
In FIGS. 1B and 1C and FIG. 2A, the alternate long and short dash line indicated by the symbol L1 indicates the boundary position between the distal end side shaft portion 5 and the proximal end side shaft portion 6. .

<Description of the lead part>
The leading portion 7 is a portion that is inserted into the injection hole 3 first when the shaft body 4 is inserted into the injection hole 3. When the shaft body 4 is displaced in the radial direction with respect to the injection hole 3, the injection hole 3. It serves to stop the radial displacement by abutting against the peripheral edge of the shaft and as a mandrel during the rotational movement of the shaft body 4.

<Description of engaging part>
The engaging portion 8 has a tapered outer peripheral surface, and the tapered outer peripheral surface of the engaging portion 8 is injected at a boundary position (a position indicated by a line L1) between the distal end side shaft portion 5 and the proximal end side shaft portion 6. The outer diameter is equal to the inner diameter of the hole 3, and the outer diameter decreases from the position indicated by the line L <b> 1 toward the distal end of the distal end side shaft portion 5. It is formed in a shape having an equal outer diameter.
The engaging portion 8 is configured such that when the leading portion 7 in the distal end side shaft portion 5 is inserted into the injection hole 3, its tapered outer peripheral surface engages with the peripheral edge of the injection hole 3. When the tapered outer peripheral surface of the engaging portion 8 is engaged with the peripheral edge of the injection hole 3, the injection hole 3 and the shaft body 4 are coaxial with each other by the aligning action of the tapered outer peripheral surface of the engaging portion 8. The positioning cap 1 can be easily and accurately positioned with respect to the injection hole 3 simply by inserting the leading portion 7 of the distal shaft portion 5 into the injection hole 3.

<Explanation of melting allowance>
The fusion margin 9 is formed by making the outer peripheral portion of the base end side shaft portion 6 larger than the inner diameter of the injection hole 3 and has a tapered outer peripheral surface.
The tapered outer peripheral surface of the melting margin 9 has an outer diameter equal to the inner diameter of the injection hole 3 at the boundary position (position indicated by the line L1) between the distal end side shaft portion 5 and the proximal end side shaft portion 6. The outer diameter increases from the position indicated by L1 toward the base end position of the base end side shaft portion 6, and is finally formed in a shape having an outer diameter smaller than the outer diameter of the collar portion 11 described later. Yes.
The melting margin 9 is melted by frictional heat with the peripheral edge of the injection hole 3 at the time of rotational friction welding, and is formed into a taper shape so that the bite into the peripheral edge of the injection hole 3 is improved. 3 can be firmly welded, and can be pushed more easily at the time of rotary friction welding. Further, for example, even if the inner surface member 2 has a slightly curved shape, injection is possible. The peripheral edge of the hole 3 can be surely brought into contact, and problems such as poor welding can be prevented in advance.

Here, the taper outer peripheral surface of the engaging portion 8 and the taper outer peripheral surface of the melting margin portion 9 are integrally connected so as to be flat without any step between them, The tapered outer peripheral portion 10 of the shaft body 4 is formed by the surface and the tapered outer peripheral surface of the melting margin 9.
In addition, the tapered outer peripheral surface of the engaging portion 8 and the tapered outer peripheral surface of the melting allowance portion 9 are integrally connected so that there is no step between the two as described above. As long as it can be seen as an inclined surface, for example, it may be formed from a fine step portion whose outer diameter gradually increases toward the base end position.

<Explanation of buttock>
On the base end side of the shaft body 4, an annular flange 11 is provided integrally with the shaft body 4 so as to project outward in the radial direction of the shaft body 4.
The flange portion 11 has a facing surface 12 that faces the peripheral portion of the injection hole 3 in the inner surface member 2 when the distal end side shaft portion 5 of the shaft body 4 is inserted into the injection hole 3. The axial arrangement with respect to the shaft body 4 is determined so that a predetermined gap S1 exists between the peripheral portion of the injection hole 3 and the facing surface 12 when it is in contact with the peripheral edge of the injection hole 3, When the shaft body 4 is pushed into the injection hole 3 by a predetermined distance corresponding to the gap S1 during the rotary friction welding, the facing surface 12 of the flange 11 is brought into contact with the peripheral portion of the injection hole 3. Yes.

Here, the fusion margin 9 and the flange 11 are integrally formed so that the tapered outer peripheral surface of the fusion margin 9 and the facing surface 12 of the flange 11 are continuous.
As a result, the opposing surface 12 of the flange portion 11 is brought into contact with the peripheral portion of the injection hole 3 at the moment when the melting margin 9 is completely melted by the rotational friction welding, whereby the shaft body 4 is further moved into the depth of the injection hole 3. Since it will not be pushed in, the periphery of the injection hole 3 and the fusion margin part 9 will be welded reliably.
Temporarily, the taper outer peripheral surface of the melting allowance portion 9 and the facing surface 12 of the flange portion 11 are not continuous, and a circumferential surface extending straight in the axial direction of the shaft body 4 is interposed between the two, for example, When the marginal portion 9 and the flange portion 11 are arranged apart from each other by the circumferential surface, the shaft body 4 is further moved to the depth of the injection hole 3 by the amount by which the circumferential surface is provided at the time of rotational friction welding. The welded portion 16 (described later) formed by the melted portion of the peripheral edge of the injection hole 3 and the fusion allowance portion 9 is pushed in the direction of penetrating the inner surface member 2, and the mere circumference On the surface, heat generation due to rotational friction with the peripheral edge of the injection hole 3 is insufficient, which may cause poor welding.
Therefore, the fusion margin portion 9 and the flange portion 11 are integrally connected in the axial direction of the shaft body 4 so that the tapered outer peripheral surface of the fusion margin portion 9 and the facing surface 12 of the flange portion 11 are continuous. Good.

<Description of the top plate>
On the base end side of the shaft body 4, the top plate portion 13 is further integrated with the shaft body 4 and the flange portion 11 so as to close the base end side opening of the shaft body 4 made of a hollow shaft-shaped member having a cylindrical cross section. Is formed.

<Description of the rotational power receiver>
A rectangular parallelepiped block portion 14 is integrally provided on the back surface of the top plate portion 13, and the top plate portion 13 and the block portion 14 are formed in an elongated rectangular shape so as to be dug down at a predetermined depth across both. A hole (minus groove) 15 is provided.
Into this rectangular hole 15, for example, the tip of a minus driver bit connected to the output shaft of a rotary tool such as an electric impact driver or an air impact wrench can be inserted. The output rotational power is received by the inner wall surface of the rectangular hole 15, and the received rotational power is transmitted to the shaft body 4.
Thus, by adopting a configuration in which the rectangular hole 15 for receiving the rotational power from the rotary tool is provided on the base end side of the shaft body 4, the closing operation described later can be performed more efficiently using the rotary tool. .
The rectangular hole 15 corresponds to the “rotary power receiving portion” of the present invention.

<Description of thermoplastic resin>
Examples of the thermoplastic resin constituting the closure cap 1 and the inner surface member 2 include polyethylene (PE, LDPE, HDPE, LLDPE, etc.), polystyrene (PS), polycarbonate (PC), polypropylene (PP), polybutylene terephthalate ( PBT), polyethylene terephthalate (PET), polyamide (PA), polyacetal (POM) and the like.
The closing cap 1 and the inner surface member 2 are preferably the same type of resin.

  Next, a closing method for closing the injection hole 3 formed in the inner surface member 2 by using the closing cap 1 configured as described above will be described with reference to FIGS. 2 (a) and 2 (b).

A minus driver bit is connected in advance to an output shaft of a rotary tool such as an electric impact driver or an air impact wrench (not shown).
Next, as shown in FIG. 2A, the distal end side shaft portion 5 of the closing cap 1 is inserted into the injection hole 3, and the melting margin portion 9 of the closing cap 1 is brought into contact with the peripheral edge of the injection hole 3. At this time, the closing cap 1 is inserted into the injection hole 3 in a state where a gap S1 exists between the flange portion 11 of the closing cap 1 and the peripheral portion of the injection hole 3.
Next, the tip of the minus driver bit attached to the rotary tool is inserted into the rectangular hole 15 of the closing cap 1.
Next, the rotary tool is operated to apply rotational power to the shaft body 4 of the closing cap 1 to rotate the shaft body 4 and push it into the injection hole 3 while rotating it.
Thereby, rotational friction arises in the contact site | part of the peripheral part of the injection hole 3, and the fusion | melting margin part 9 of the closure cap 1, and the peripheral part of the injection hole 3 by the heat_generation | fever by friction according to relative rotational speed and pushing force And the melting allowance portion 9 of the closing cap 1 begin to melt, and the effect of stirring the molten resin by relative rotation is added to this, and the structure of the melted portion of both is entangled.
Then, as shown in FIG. 2 (b), the shaft body 4 of the closing cap 1 is pushed by a predetermined distance corresponding to the gap S1 by the rotational friction welding, so that the flange portion 11 of the closing cap 1 becomes the injection hole. After the contact with the peripheral part 3, the operation of the rotary tool is stopped to stop applying the rotational power to the shaft body 4 of the closing cap 1.
Thereby, both the peripheral part of the injection hole 3 and the fusion | melting part 9 of the fusion | melting margin part 9 of the closure cap 1 cool and solidify, and the closure cap 1 and the inner surface member 2 are connected via the welding part 16 formed by this. A tightly bonded closure structure is obtained.
Thus, since welding is performed by the synergistic effect of friction melting and stirring by relative rotation, high-strength bonding can be achieved in bonding of almost all kinds of thermoplastic resins as long as the melting point temperature is not greatly different.

<Description of effects>
In the closing cap 1 and the closing structure and closing method using the same according to the first embodiment, the melting margin 9 of the closing cap 1 is brought into contact with the periphery of the injection hole 3 formed in the inner surface member 2. Thus, the closing cap 1 is welded to the inner surface member 2 by rotating friction welding that is pushed into the injection hole 3 while rotating the shaft body 4 of the closing cap 1, so that the shaft body 4 of the closing cap 1 is attached to the shaft body 4. The injection hole 3 can be easily closed using a general-purpose rotary tool such as an electric impact driver or an air impact wrench capable of applying rotational power.

At the time of rotational friction welding in the above-described closing operation, the distal end side shaft portion 5 of the closing cap 1 inserted into the injection hole 3 is rotated within the injection hole 3, so that the distal end side inserted into the injection hole 3 The shaft portion 5 serves as a mandrel during the rotational motion to prevent the displacement of the closing cap 1 with respect to the injection hole 3 and to stabilize the rotational motion.
Further, at the time of rotational friction welding in the above-described closing operation, the shaft body 4 of the closing cap 1 is pushed into the injection hole 3 by a predetermined distance corresponding to the gap S1, and the opposing surface of the flange portion 11 of the closing cap 1 is pressed. If 12 contacts the peripheral part of the injection hole 3 in the inner surface member 2, the contact area of the closing cap 1 with respect to the inner surface member 2 will increase abruptly, so that a frictional force that stops the rotation of the closing cap 1 works. As a result, the operator can easily recognize that the melting margin 9 is completely melted and the welding is being completed, and the closure cap 1 is prevented from being pushed further into the injection hole 3. The movement of the closing cap 1 in the pushing direction can be stopped by the portion 11, and the closing cap 1 can be prevented from penetrating deeply into the injection hole 3.
In addition, when performing the above-described closing operation, for example, a pretreatment required in the technique according to Patent Document 2, that is, a special pretreatment such as forming a funnel-shaped enlarged diameter portion in the peripheral portion of the through hole in advance. Is not necessary, and the flange portion 11 of the closing cap 1 is inserted into the injection hole 3 while the shaft body 4 of the closing cap 1 is rotated in a state where the melting margin 9 of the closing cap 1 is in contact with the peripheral edge of the injection hole 3. The closure cap 1 and the inner surface member 2 can be easily joined simply by pushing the closure cap 1 into the back of the injection hole 3 until it comes into contact with the peripheral portion.

  Therefore, according to the closing cap 1 of the first embodiment and the closing structure and closing method using the same, the injection hole 3 of the inner surface member 2 can be easily formed using a general-purpose rotary tool or the like without using a special machine. In addition, it can be blocked efficiently.

[Second Embodiment]
FIG. 3 is a view showing a closing cap according to a second embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, (c) is a bottom view, Each is shown.
In the second embodiment, the same or similar parts as those in the first embodiment described above are designated by the same reference numerals in the drawings, and detailed description thereof will be omitted. The description will focus on the parts specific to the second embodiment (the same applies to third to fifth embodiments described later).

  In the closing cap 1 of the first embodiment, the shaft body 4 is made of a hollow shaft-shaped member having a cylindrical cross section, whereas in the closing cap 1A of the second embodiment, the shaft body 4A. Is made of a solid shaft-shaped member having a circular cross section, and accordingly, the top plate portion 13 and the block portion 14 which are required in the closing cap 1 of the first embodiment are not required, and these top plate portions The shaft body 4A itself plays the role of the block 13 and the block portion 14, and the rectangular hole 15 serving as the rotational power receiving portion is provided directly in the base end portion of the shaft body 4A. It is the same structure as the cap 1 for closure of 1st Embodiment.

  The closing cap 1A according to the second embodiment and the closing structure and closing method using the same are the same as the closing cap 1 according to the first embodiment and the closing structure and closing method using the same. An effect can be obtained.

[Third Embodiment]
FIG. 4 is a view showing a closing cap according to a third embodiment of the present invention, where (a) is a plan view, (b) is a front view, (c) is a bottom view, Each is shown.

  In the closing cap 1 of the first embodiment, the taper outer peripheral surface of the melting margin 9 formed on the proximal end side shaft portion 6 of the shaft body 4 has the distal end side shaft portion 5 and the proximal end side shaft portion 6. The outer diameter is equal to the inner diameter of the injection hole 3 (the position indicated by the line L1), and the outer diameter increases from the position indicated by the line L1 toward the base end position of the base end side shaft portion 6. In contrast, in the closing cap 1B of the third embodiment, the shaft body 4B (hollow shaft-shaped member) is formed. Alternatively, a solid shaft-shaped member may be used, but here, the case of a solid shaft-shaped member is shown.) The taper outer peripheral surface of the melting margin portion 9B formed in the base end side shaft portion 6B is At the boundary position between the shaft portion 5 and the proximal end side shaft portion 6 (the position indicated by the line L1), the inner diameter of the injection hole 3 is The outer diameter is the same as the closing cap 1 of the first embodiment until the outer diameter increases from the position indicated by the line L1 toward the base end position of the base end side shaft portion 6B. However, the outer cap is finally formed in a shape equal to the outer diameter of the collar portion 11 and the outer appearance is a countersunk screw shape. Otherwise, the closure cap of the first embodiment is basically used. 1 and the same structure.

  The closing cap 1B of the third embodiment described above and the closing structure and closing method using the same are the same as the closing cap 1 of the first embodiment and the closing structure and closing method using the same. An effect can be obtained.

[Fourth Embodiment]
FIG. 5 is a view showing a closing cap according to a fourth embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, (c) is a bottom view, Each is shown.

  In the closing cap 1 of the first embodiment, the melting margin 9 having a tapered outer peripheral surface is employed, whereas in the closing cap 1C of the fourth embodiment, the proximal side shaft is provided. A plurality of stages in which the outer diameter increases stepwise toward the base end position of the portion 6C (only two stages are illustrated here, but may be three stages or more, or may be one stage. 9C is used, and the rest is basically the same structure as the closing cap 1 of the first embodiment.

  The closing cap 1C of the fourth embodiment described above and the closing structure and closing method using the same are the same as the closing cap 1 of the first embodiment and the closing structure and closing method using the same. An effect can be obtained.

[Fifth Embodiment]
FIG. 6 is a diagram showing a closing cap according to a fifth embodiment of the present invention, where (a) is a plan view, (b) is a front view, (c) is a bottom view, Each is shown.
FIG. 7 is a diagram showing rotational friction welding using the closing cap of the fifth embodiment. FIG. 7A is a state diagram in which the closing cap is inserted into the injection hole. FIG. 2 shows a state diagram in which the melting margin part of the closing cap and the peripheral part of the injection hole are welded.

<Outline explanation of cap for closure>
The closing cap 1D shown in FIGS. 6 (a), 6 (b) and 6 (c) and FIG. 7 (a) is an inverted truncated cone-shaped solid shaft-shaped member (of course, of course with a circular cross section and tapering toward the tip). A hollow shaft-shaped member may be used, but here, only an example in which a solid shaft-shaped member is employed is shown).

<Description of shaft>
A shaft body 4D shown in FIG. 7A is set to have a predetermined length dimension that can be inserted so as to penetrate the injection hole 3, and includes a distal end side shaft portion 5D that is located on the distal end side and a base position that is located on the proximal end side. The end side shaft portion 6D is integrally formed.
The distal end side shaft portion 5D has an outer diameter that is smaller than the inner diameter dimension of the injection hole 3 and increases toward the proximal end position, and the outer diameter of the proximal end position is larger than the inner diameter dimension of the injection hole 3. It has a leading portion 7D that is formed in a slightly smaller partial inverted truncated cone shape, and an engaging portion 8D that is integrally formed on the proximal end side of the leading portion 7D and engages with the peripheral edge of the injection hole 3.
The proximal end side shaft portion 6D is formed in a partially inverted truncated cone shape that is continuous with the distal end side shaft portion 5D without a step, and its outer diameter increases as it advances from the distal end position toward the proximal end position. Has a melting margin 9D.
In FIGS. 6B and 6C and FIG. 7A, the alternate long and short dash line indicated by the symbol L1 indicates the boundary position between the distal end side shaft portion 5D and the proximal end side shaft portion 6D. A two-dot chain line indicated by symbol L2 indicates a boundary position between the leading portion 7D and the engaging portion 8D.

<Description of the lead part>
The leading portion 7D is a portion that is inserted into the injection hole 3 first when the shaft body 4D is inserted into the injection hole 3, and when the shaft body 4D is displaced in the radial direction with respect to the injection hole 3, the injection hole 3 is inserted. It serves to stop the radial displacement by abutting on the peripheral edge of the shaft and as a mandrel during the rotational movement of the shaft body 4D.

<Description of engaging part>
The engaging portion 8D has a tapered outer peripheral surface, and the tapered outer peripheral surface of the engaging portion 8D is injected at a boundary position (a position indicated by the line L1) between the distal end side shaft portion 5D and the proximal end side shaft portion 6D. The outer diameter is equal to the inner diameter of the hole 3, and the outer diameter decreases from the position indicated by the line L1 toward the distal end of the distal end side shaft portion 5D.
The engaging portion 8D is configured such that when the leading portion 7D in the distal end side shaft portion 5D is inserted into the injection hole 3, its tapered outer peripheral surface engages with the peripheral edge of the injection hole 3. When the tapered outer peripheral surface of the engaging portion 8D is engaged with the peripheral edge of the injection hole 3, the injection hole 3 and the shaft body 4D are coaxial with each other by the aligning action of the tapered outer peripheral surface of the engaging portion 8D. The positioning cap 1D can be easily and accurately positioned with respect to the injection hole 3 simply by inserting the leading portion 7D of the distal end side shaft portion 5D into the injection hole 3.

<Explanation of melting allowance>
The fusion margin 9D is formed by making the outer peripheral portion of the base end side shaft portion 6D larger than the inner diameter of the injection hole 3, and has a tapered outer peripheral surface.
The taper outer peripheral surface of the melting margin 9D has an outer diameter equal to the inner diameter of the injection hole 3 at the boundary position (position indicated by the line L1) between the distal end side shaft portion 5D and the proximal end side shaft portion 6D. The outer diameter increases from the position indicated by L1 toward the base end position of the base end side shaft portion 6D, and is finally formed in a shape having an outer diameter smaller than the outer diameter of the flange portion 11.
The melting margin 9D is melted by frictional heat with the peripheral edge of the injection hole 3 at the time of rotational friction welding, and since it is formed in a tapered shape, the bite into the peripheral edge of the injection hole 3 is improved. 3 can be firmly welded, and can be pushed more easily at the time of rotary friction welding. Further, for example, even if the inner surface member 2 has a slightly curved shape, injection is possible. The peripheral edge of the hole 3 can be surely brought into contact, and problems such as poor welding can be prevented in advance.

  The tapered outer peripheral surface of the engaging portion 8D and the tapered outer peripheral surface of the melting margin portion 9D are integrally connected so as to be flat without any step therebetween, and the tapered outer peripheral surface of these engaging portions 8D. The tapered outer peripheral surface 10D of the shaft body 4D is formed by the tapered outer peripheral surface of the melting margin portion 9D.

<Explanation of buttock>
On the base end side of the shaft body 4D, an annular flange 11 is provided integrally with the shaft body 4D so as to project outward in the radial direction of the shaft body 4D.
The flange portion 11 has a facing surface 12 that faces the peripheral portion of the injection hole 3 in the inner surface member 2 when the distal end side shaft portion 5D of the shaft body 4D is inserted into the injection hole 3, and the melting margin portion 9D is The arrangement in the axial direction with respect to the shaft body 4D is determined so that a predetermined gap S2 exists between the peripheral portion of the injection hole 3 and the facing surface 12 when in contact with the peripheral edge of the injection hole 3. When the shaft body 4D is pushed into the injection hole 3 by a predetermined distance corresponding to the gap S2 during the rotary friction welding, the facing surface 12 of the flange 11 is brought into contact with the peripheral portion of the injection hole 3. ing.

Here, the fusion margin 9D and the flange 11 are integrally formed so that the tapered outer peripheral surface of the fusion margin 9D and the facing surface 12 of the flange 11 are continuous.
Thereby, at the moment when the melting margin portion 9D is completely melted by the rotary friction welding, the facing surface 12 of the flange portion 11 is brought into contact with the peripheral portion of the injection hole 3, whereby the shaft body 4D is further moved into the depth of the injection hole 3. Since it will not be pushed in, the periphery of the injection hole 3 and the fusion margin part 9D will be welded reliably.
Temporarily, the taper outer peripheral surface of the melting allowance portion 9D and the facing surface 12 of the flange portion 11 are not continuous, and, for example, a circumferential surface extending straight in the axial direction of the shaft body 4D is interposed between them. When the marginal portion 9D and the flange portion 11 are arranged apart from each other by the circumferential surface, the shaft body 4D is excessively moved to the back of the injection hole 3 by the amount by which the circumferential surface is provided at the time of rotational friction welding. The welded portion 16D formed by the melted portion of the peripheral edge of the injection hole 3 and the melting allowance portion 9D is pushed in the direction of penetrating the inner surface member 2, and on the mere circumferential surface Since heat generation due to rotational friction with the peripheral edge of the injection hole 3 is insufficient, there is a risk of causing poor welding.
Therefore, the fusion margin portion 9D and the flange portion 11 are integrally connected in the axial direction of the shaft body 4D so that the tapered outer peripheral surface of the fusion margin portion 9D and the facing surface 12 of the flange portion 11 are continuous. Good.

  The closing cap 1D of the fifth embodiment and the closing structure and closing method using the same are the same as those of the closing cap 1 of the first embodiment and the closing structure and closing method using the same. An effect can be obtained.

  As mentioned above, although the closure cap of the present invention, the closure structure using the same, and the closure method were explained based on a plurality of embodiments, the present invention is not limited to the composition described in the above embodiment, The configuration can be appropriately changed within a range not departing from the gist, such as appropriately combining the configurations described in the embodiments.

For example, in each of the above embodiments, the example in which the rectangular hole 15 is employed as the rotational power receiving portion for receiving the rotational power from the rotary tool has been described. However, the present invention is not limited to this, and any non-circular hole may be used. For example, a square hole, a hexagonal hole, or a cross-shaped hole may be employed instead of the rectangular hole 15.
Further, a gripping shaft that is gripped by the chuck of the rotary tool or a non-circular cross-sectional protrusion that engages with the tool bit of the rotary tool is provided as a rotational power receiving portion at the base end portion of the shaft body 4, and these gripping shafts and protrusions are provided. Alternatively, the rotational power from the rotary tool may be transmitted to the shaft body 4.
Further, the outer shape of the flange portion 11 is made non-circular, and rotational power from the rotary tool is transmitted to the shaft body 4 via a socket wrench or the like engaged with the flange portion 11, or the flange portion 11 itself is There may be a mode in which the rotational power is transmitted to the shaft body 4 by gripping with the chuck.

  Next, more specific examples of the closure cap of the present invention, and the closure structure and closure method using the same will be described.

<Description of Examples 1 to 5>
In the closing cap 1 of the first embodiment shown in FIG. 1B, the height H of the tapered outer peripheral portion 10 constituted by the engaging portion 8 and the melting margin portion 9 when the diameter of the shaft body 4 is 30 mm. As shown in Table 1, three levels (Experiment Nos. 1 to 3) were prepared for the width W and the angle θ, and these were designated as Examples 1 to 3.
In the closing cap 1B of the third embodiment shown in FIG. 4B, the height H of the tapered outer peripheral portion 10B configured by the engaging portion 8 and the melting margin portion 9B when the diameter of the shaft body 4B is 30 mm. As shown in Table 1, two levels (Experiment Nos. 4 and 5) were prepared for the width W and the angle θ, and these were designated as Examples 4 and 5.

<Description of Comparative Examples 1 to 5>
In the cap for closure according to Example 1, the taper outer peripheral part 10 was not used, and the thickness (t) of the flange part 11 was set to 1.5 mm (Experiment No. 6) as Comparative Example 1.
In the closing cap according to Example 1, the taper outer peripheral portion 10 was not used, and the thickness (t) of the flange portion 11 was set to 2.0 mm (Experiment No. 7) as Comparative Example 2.
In the closing cap according to Example 1, the flange portion 11 was not used, and the outermost diameter of the tapered outer peripheral portion 10 was set to be the same as the inner diameter of the injection hole 3 (Experiment No. 8).
In the closing cap according to the first embodiment, the leading portion 7 in the distal end side shaft portion 5 is omitted, and the height H, width W, and angle θ of the tapered outer peripheral portion 10 are two levels as shown in Table 1 (Experiment No. .9 and 10) were prepared, and these were designated as Comparative Examples 4 and 5.

Using each of Examples 1 to 5 and Comparative Examples 1 to 5, rotational friction welding was performed on the inner surface member 2, and the welded state was evaluated.
In each of Examples 1 to 5, the rotational friction welding could be easily and smoothly performed without any trouble, and as shown in Table 1, a good welded state was shown.

On the other hand, in the comparative example 1, since there is no tapered outer peripheral portion 10 and the thickness of the flange portion 11 is thin, the flange portion 11 is separated from the shaft body 4 during the operation of the rotary friction welding, resulting in poor welding. It became.
In Comparative Example 2, since the thickness of the flange portion 11 is larger than that in Comparative Example 1, a part of the facing surface 12 of the flange portion 11 is not welded to the peripheral portion of the injection hole 3. However, since the penetration of the welded portion was shallow, the welding strength was insufficient, and it was easy to peel off, resulting in poor welding.
Moreover, since the thing of the comparative example 3 does not have the collar part 11, if the collar part 11 exists, the stopper function which works will not be obtained, but the shaft body 4 penetrates into the back of the injection hole 3 by the pushing at the time of rotational friction welding. Oops.
Moreover, in the comparative examples 4 and 5, although the engaging portion 8 of the distal end side shaft portion 5 is engaged with the peripheral edge of the injection hole 3, the leading end portion 7 of the distal end side shaft portion 5 is not provided. When a force is unexpectedly applied in the radial direction, the position may be displaced, and the rotational motion during the rotary friction welding is not stable, and once welded, but the strength was insufficient, resulting in poor welding.

  The closing cap and the closing structure and closing method using the same according to the present invention can easily and efficiently open an opening of a structure made of a thermoplastic resin molded body using a general-purpose rotary tool or the like without using a special machine. Since it has the characteristic of being able to close well, it can be used suitably for the use which closes injection holes, such as mortar formed in the rehabilitation pipe, for example.

1, 1A-1D Closing cap 2 Inner surface member (thermoplastic resin molding)
3 injection hole (opening)
4, 4A to 4D Shaft body 5, 5D Tip side shaft portion 6, 6B to 6D Base end side shaft portion 9, 9B to 9D Melting margin portion 11 Hook portion 15 Rectangular hole (rotational power receiving portion)
16, 16D weld

Claims (4)

  A closing cap for closing an opening formed in a structure, the proximal end shaft portion having a fusion margin having an outer diameter larger than the inner diameter of the opening portion, and the distal end side of the proximal end shaft portion And a shaft body having a distal end side shaft portion rotatably inserted into the opening portion, and the distal end side shaft portion of the shaft body is inserted into the opening portion to open the melting margin portion. And a flange portion that is provided integrally with the base end side shaft portion so as to leave a gap with the structure when in contact with the periphery of the portion. Inserting and rotating the shaft body in a state where the melting margin is in contact with the periphery of the opening, while rotating the shaft body, the fusion margin is melted by frictional heat with the periphery of the opening. A cap for closure which is characterized by being made to do so.   2. The closing cap according to claim 1, wherein a rotational power receiving portion for receiving rotational power from the rotary tool is provided on the proximal end side of the shaft body.   3. A closing structure in which an opening formed in a structure made of a thermoplastic resin molding is closed using the closing cap according to claim 1 or 2, wherein a melting margin of the closing cap is a peripheral edge of the opening. The welded portion formed by rotating frictional pressure welding that pushes the shaft of the closing cap into the back of the opening while rotating the shaft of the closing cap until it comes into contact with the structure. The structure and the closure cap are joined through the closure structure.   A closing method for closing an opening formed in a structure made of a thermoplastic resin molded body using the closing cap according to claim 1, wherein the front end side shaft portion of the closing cap is used as the opening. Insert and allow the melting margin of the closing cap to contact the periphery of the opening, and then apply rotational power to the shaft of the closing cap and push it into the opening while rotating the shaft to close it. A closing method, comprising: stopping the application of rotational power to the shaft body of the closing cap after the collar portion of the cap is brought into contact with the structure.

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