JP3416182B2 - Sealant filling method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling a sealant, and more particularly to a method for filling a threaded joint comprising a tube and a joint member, and a tube and a tube. The present invention relates to a method of filling a sealant in which a sealant applied to a peripheral portion of a threaded joint portion of a pipe, such as a threaded joint portion to be sealed, is pushed into a threaded fitting portion of the threaded joint portion to be filled. . 2. Description of the Related Art Conventionally, as this kind of sealant filling method, there has been a method shown in FIG. That is, the joint boundary 1A on the outer peripheral surface of the threaded joint portion 3 can be freely surrounded in a tubular manner over each of the tube 1 and the joint member 2 (or the tube 1 and the tube 1 (not shown)) constituting the threaded joint portion 3. A flexible film body 20 is provided, and rubber strings 21 are wound and fastened to both ends of the film body 20, respectively, to form a closed space X surrounded by the film body 20 outside the joint boundary 1A, Further, by sending gas from a gas supply device disposed in a working space around the pipe through the supply pipe 22 to the closed space X, the closed space X is pressurized and the sealing agent S is supplied to the screw joint 3. There is a method of permeating the screw fitting portion 3a. [0003] By the way, in a pipe as a target on which the above-mentioned conventional method is performed, for example,
Like a pipe such as a gas pipe or a water pipe, there is almost no separation space between the pipe and the wall surface and a working space is hardly formed around the pipe in many cases, and the gas supply device is substantially disposed around the pipe. Therefore, there is a problem that the operation of filling the sealant may not be performed substantially. Furthermore, in the above-mentioned conventional method, the sealing agent S is reliably filled into the screw fitting portion 3a only after the pressure in the closed space X is reliably increased. When winding and fastening each, the closed space X
In order to reliably perform sealing to the outside, there is a problem that the winding and fastening operation of the rubber string 21 must be carefully performed using various sealing members despite the poor workability. The present invention has been made in view of such a situation. Even if there is almost no working space around the pipe, the filling operation of the sealant can be effectively performed, and the conventional various seals are used. It is an object of the present invention to provide means capable of improving workability by eliminating a careful winding / fastening operation using members. [0004] In a method of filling a sealant according to the present invention (hereinafter referred to as the method of the present invention), a sealant is applied to a peripheral portion of a threaded joint of a pipe in order to seal the threaded joint. A sealant filling method in which a sealant is filled by being pushed into a screw fitting portion of the threaded joint portion, at a position separated from the end face of the female threaded portion of the screwed joint portion outwardly of the female threaded portion, A reaction force receiving wall is formed over the entire circumference of the pipe,
An elastic body is wound around the entire circumference of the pipe between the end face of the female screw portion and the reaction force receiving wall, and the sealing agent is pushed into the screw fitting portion by tightening the elastic body. ing. When the sealing agent is filled by the method of the present invention, the reaction force receiving wall is formed over the entire circumference of the pipe, and the reaction force receiving wall and the female screw at the threaded joint portion are formed. After the elastic body is wound around the entire circumference of the tube between the end face of the portion and the elastic body, by tightening the elastic body in the diameter reducing direction, the sealing agent is boosted by the elastic body and the filling operation is effectively performed. Therefore, it is unnecessary to dispose the gas supply device around the pipe, which has been conventionally required in spite of requiring a large work space. In addition, the filling of the screwing portion with the sealing agent is performed by directly pushing the sealing agent with the elastic body as described above. There is no need to supply gas to the space, and thus no sealing work to the outside of the closed space is required. According to the method of the present invention, as described above,
Since the arrangement of the gas supply device, which was conventionally required, is not required, even if there is almost no work space around the pipe, the work of filling the sealant can be substantially performed. Moreover, according to the method of the present invention, as described above, the sealing work for the outside of the closed space and the gas supply to the space, which were conventionally required, are not required, so that the sealing work for the space having poor workability can be performed. Therefore, the workability at the time of filling the sealant can be improved as compared with the related art. An embodiment of the present invention will be described below with reference to the drawings. In the drawings, portions denoted by the same reference numerals as those of the conventional example indicate the same or corresponding portions. FIGS. 1A and 1B show an embodiment of the method of the present invention. Reference numeral 1 in the figure denotes a gas pipe as an example of the pipe. By connecting a plurality of the gas pipes 1, a part of a gas pipe from a gas supply source side to a customer is formed. I have. Adjacent ones of the gas pipes 1 are connected via a threaded joint 3, and the threaded joint 3 is specifically connected to a male thread 1 m formed on the outer peripheral portion of the gas pipe 1. A screw fitting portion 3a formed by a combination with a female screw portion 2f formed on the inner peripheral portion of the socket-shaped joint member 2.
It consists of. Then, in order to seal the threaded joint portion 3 around the threaded joint portion 3, a sealing agent S is applied while being carried on a yarn or the like wound around the peripheral portion, and the sealing agent S is applied to the periphery of the threaded joint portion 3. The work of pushing and filling the screw fitting portion 3a is performed, and the method of the present invention described below is applied to perform the filling work. First, as shown in FIG. 1A, the female thread 2f of the threaded joint 3 is cut from the end face of the female thread 2f.
A reaction force receiving wall 6 is formed over the entire circumference of the pipe at a position spaced apart by a predetermined distance outside the pipe. More specifically, the reaction force receiving wall 6 is formed of a belt-like body for forming a reaction force receiving wall in which one longitudinal end surface 6b is formed in a plane and the other longitudinal end surface 6a is formed in a stepped surface, and It is formed by winding over the entire circumference of the gas pipe 1 and then winding and fastening the band 7 from the outer circumference with the longitudinal end face 6a facing the screw joint portion 3 and positioned at the separated position. I do. afterwards,
The end face of the female screw portion 2f and the end face 6a of the reaction force receiving wall 6
And an end surface 4a having a width dimension close to their separation distance (more specifically, the separation distance at the outer peripheral portion) and having a shape corresponding to the step shape of the end surface 6a of the reaction force receiving wall 6. On the other hand, an elastic body 4 provided as an end face is wound around the entire circumference of the gas pipe 1 from outside, and further, a fastening jig 8 made of, for example, a steel strip is wound therearound. still,
As the elastic body 4, for example, C
Use a rubber belt that can be directly wound around a ring. Thereafter, as shown in FIG. 1 (b), the sealing jig 8 is reduced in diameter to tighten the elastic body 4 until the elastic body 4 protrudes outward from the gap. The filling operation of the sealant S is completed by pushing the sealing agent S into the screw fitting portion 3a. When the elastic body 4 is tightened, both the end face 6a of the reaction force receiving wall 6 and the end face 4a of the elastic body 4 are formed in a stepped shape. Surface 6a, 4a
, The displacement of the elastic body 4 in the tube axis direction is suppressed, and the tightening is effectively performed. In the above-described embodiment, the lower limit of the width of the elastic body 4 is not particularly limited. However, the lower limit of the width of the elastic body 4 is limited to the distance between the end face of the female screw portion 2f and the opposite end. It is preferable that the distance is set to be equal to or larger than the distance between the force receiving wall 6 and the end surface 6a (more specifically, the distance at the outer peripheral portion). If the elastic body 4 having such a width lower limit set is used, the elastic body 4 can be more reliably protruded out of the gap by the diameter reduction deformation of the fastening jig 8. Thus, the sealant S can be more reliably pushed into the screw fitting portion 3a. Next, another embodiment will be described. In the drawings, portions denoted by the same reference numerals as those in the above-described embodiment indicate the same or corresponding portions. In the embodiment described above, both the end face 6a of the reaction force receiving wall 6 and the end face 4a of the elastic body 4 are formed in a stepped shape. However, as shown in FIG. Even if the 6a and 4a are configured as tapered surfaces that can be engaged with each other, the tightening of the elastic body 4 is effectively performed based on the engagement of the both end surfaces 6a and 4a. According to this embodiment, there is an advantage that the more the elastic body 4 is tightened, the more the elastic body 4 is pressed toward the threaded joint 3. As shown in FIG. 3, both the end face 6a of the reaction force receiving wall 6 and the end face 4a of the elastic body 4 are formed as straight faces, and the opposite end face 4b of the elastic body 4 is formed. An embodiment in which is formed in a step shape is also conceivable. In this case, the opposite end surface 4 of the elastic body 4 formed in the step shape
By engaging b with the outer peripheral portion of the threaded joint 3, displacement of the elastic body 4 in the tube axis direction can be suppressed, and the tightening can be performed effectively. This embodiment is particularly effective when the thickness of the threaded joint 3 is small. Further, the threaded joint 3 to which the method of the present invention is applied is not limited to the one composed of the pipe 1 and the joint member 2 as in the above-described embodiment.
It may be a screw joint (not shown) composed of the pipe 1 and the pipe 1. [0015] In the claims, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing one embodiment of a sealant filling method according to the present invention. FIG. 2 is an explanatory view showing another embodiment of a sealant filling method according to the present invention. FIG. 4 is an explanatory view showing another embodiment of the sealant filling method according to the present invention. FIG. 4 is an explanatory view showing a conventional sealant filling method. [Description of References] 1 Pipe 2f Female thread part 3 Screw joint part 3a Fitting part Reference Signs List 4 elastic body 5 belt-like body 6 reaction force receiving wall S sealing agent

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Claims (1)

(57) [Claim 1] In order to seal a threaded joint (3) of a pipe (1), a sealant (S) applied to the periphery of the threaded joint (3) is A method of filling a sealant by pushing into a screw fitting portion (3a) of the screw joint portion (3), wherein the sealant is filled from the end face of the female screw portion (2f) of the screw joint portion (3). 2f), a reaction force receiving wall (6) is formed over the entire circumference of the pipe at a position separated outwardly, and elasticity is provided between the end face of the female screw portion (2f) and the reaction force receiving wall (6). A sealing agent filling method in which the body (4) is wound around the entire circumference of the pipe, and the elastic body (4) is tightened to push the sealing agent (S) into the screw fitting portion (3a).