JP3411363B2 - Pipe flange joint sealing method and apparatus used for the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which, while the flange portions of adjacent pipes are butted and connected to each other, elastic strips are wrapped around the outer circumferential surfaces of the flanges so as to wrap the circumferential portions of the flange butting surfaces. A pair of flexible ring-shaped members are respectively attached to the outer peripheral surfaces on both sides of the elastic band-shaped member sandwiching the flange abutting surface, and the elastic band-shaped members are fastened to each other by tightening the ring-shaped members. The present invention relates to a method for sealing a flange joint portion of a pipe which is brought into pressure contact with an outer peripheral surface to seal a flange joint portion of the pipe, and an apparatus used for the method.

[0002]

2. Description of the Related Art Conventionally, in the case of sealing a flange joint portion of a pipe, a ring-shaped member integrally formed along substantially the entire circumference of the pipe and a buckle provided between opposite ends of the ring-shaped member. Using a flange joint sealing tightening device consisting of, by dragging the opposite ends of the ring-shaped member with a buckle and tightening the ring-shaped member,
The elastic strip is pressed against the outer peripheral surface of the flange.

[0003]

However, in the method of sealing the flange joint portion of the pipe by using the above-mentioned conventional fastening device for sealing the flange joint portion, when the opposite ends of the ring-shaped member are dragged together by the buckle. Since a frictional force is generated between the ring-shaped member and the outer peripheral surface of the flange portion, when the diameter of the flange portion becomes large, the frictional force causes the pulling force from the buckle to uniformly act on the ring-shaped member. Was easily disturbed. As a result, it becomes difficult to press the elastic strip to the outer peripheral surface of the flange portion evenly, and it is difficult to exhibit good sealing performance. An object of the present invention is to provide a flange joint portion sealing method capable of exhibiting excellent sealing performance even if the flange portion has a large diameter, and an apparatus used for the method.

[0004]

Means for Solving the Problems A characteristic means of a flange joint portion sealing method according to the present invention is that the inner diameter of a ring-shaped member is set to be substantially the same as the outer diameter of a flange portion, and
The ring-shaped member is divided into a first ring-shaped member and a second ring-shaped member in the radial direction, and the first and second ring-shaped members are attached to the elastic strips wound around the outer peripheral surfaces of the flange portions. The end portions of the first and second ring-shaped members facing each other are attracted so that the central portions in the longitudinal direction of the first and second ring-shaped members and the vicinity thereof are along the outer peripheral surface of the flange portion. Pre-tightening, and in the pre-tightening, the opposing ends are drawn closer to each other at a location radially inward of the location where the opposing ends are drawn together to perform final fastening.

Further, a characteristic configuration of the flange joint seal tightening device according to the present invention is that the inner diameter of the ring-shaped member is set to be substantially the same as the outer diameter of the flange portion, and the ring-shaped member is The first ring-shaped member and the second ring-shaped member are divided into two in the radial direction, and the opposing ends of the first and second ring-shaped members are connected to each other via the tightening portion. The first tightening for pulling together the mutually opposing ends of the first and second ring-shaped members so as to preliminarily tighten so that the central part in the longitudinal direction of the 2 ring-shaped member and its vicinity are along the outer peripheral surface of the flange part. A mechanism and a second tightening mechanism that is arranged radially inward of the ring-shaped member with respect to the first tightening mechanism and that pulls the opposing ends together to perform final tightening are provided in the tightening portion. That there is That.

[0006]

In other words, according to the flange joint portion sealing method of the present invention, the inner diameter of the ring-shaped member is set to be substantially the same as the outer diameter of the flange, and the ring-shaped member is divided into the first ring-shaped member and the first ring-shaped member. The first and second ring-shaped members are divided into two ring-shaped members in the radial direction, and the first and second ring-shaped members are respectively applied to the elastic strips wound around the outer peripheral surfaces of both flanges. The member is expanded in diameter by the thickness of the elastic strip, and the circumferential ends of the first and second ring-shaped members face each other. Then, in this state, the end portions of the first and second ring-shaped members facing each other are pulled together so that the longitudinal center portions of the first and second ring-shaped members and the vicinity thereof are along the outer peripheral surface of the flange portion. Since the tightening is performed, the elastic strip at the portion where the central portion in the longitudinal direction is in contact with the vicinity thereof can be pressed against the outer peripheral surface of the flange portion. Further, in the preliminary tightening, the facing ends are drawn closer to each other at a position on the inner side in the radial direction with respect to the position where the facing ends are drawn closer to each other.
With the elastic strips of the portion where the central portion in the longitudinal direction of the second ring-shaped member is in contact with the vicinity thereof being pressed against the outer peripheral surface of the flange portion, the remaining elastic strips are replaced with the first and second rings. It is possible to surely press the outer peripheral surface of the flange portion to the elastic strip-shaped body in a portion where the opposite ends of the strip-shaped member are in contact with each other. As a result, according to the above method, the elastic strip can be pressed against the outer peripheral surface of the flange portion evenly over the entire circumference.

Further, according to the tightening device for sealing the flange joint portion of the pipe according to the present invention, the inner diameter of the ring-shaped member is set to be substantially the same as the outer diameter of the flange portion, and the ring-shaped member is used as the first ring. Since the ring-shaped member and the second ring-shaped member are divided into two in the radial direction, when the first and second ring-shaped members are respectively applied to the elastic strips wound around the outer peripheral surfaces of the flange portions, The first and second ring-shaped members expand in diameter by the thickness of the elastic strip, and
Both ends of the second ring-shaped member in the circumferential direction face each other. In this state, the end portions of the first and second ring-shaped members facing each other are first so that the longitudinal center portions of the first and second ring-shaped members and the vicinity thereof are along the outer peripheral surface of the flange portion.
Since the tightening mechanism pulls and pre-tightens, the elastic strip at the portion where the central portion in the longitudinal direction and the vicinity thereof are in contact can be pressed against the outer peripheral surface of the flange portion.
Further, when the second tightening mechanism pulls the opposing ends together to perform final tightening, the second tightening mechanism
Since it is arranged on the radially inner side of the ring-shaped member with respect to the first tightening mechanism, the elastic band-shaped body of the portion where the central portions in the longitudinal direction of the first and second ring-shaped members and the vicinity thereof are in contact with each other. It is possible to reliably press the remaining elastic strips to the outer peripheral surface of the flange portion until the elastic strips of the portion in contact with the opposite end portions are brought into contact with the outer peripheral surface of the flange. As a result, according to the above-described tightening device for sealing the flange joint portion of the pipe, the elastic strip can be pressed against the outer peripheral surface of the flange portion evenly over the entire circumference.

[0008]

Therefore, according to the method for sealing the flange joint portion of the pipe and the apparatus used in the method according to the present invention,
Since the elastic strip can be pressed against the outer peripheral surface of the flange portion uniformly over the entire circumference, high sealing performance can be exhibited.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 2 and 4B, in a state where the flange portions 4 (outer diameter of 800 mm) of the gas conduits 1 adjacent to each other are butt-connected with each other with the packing 9 interposed therebetween, the gas in the pipe does not leak out. A rubber belt 6 (an example of an elastic strip) is wound around the outer peripheral surfaces of the flange portions 4 so as to wrap the peripheral portion of the flange abutting surface, and the rubber belt 6 is attached to the flange portion 4 with a tightening device for sealing a flange joint portion. The flange joint portion of the gas conduit 1 is sealed by being pressed against the outer peripheral surface of the. On the inner peripheral surface of the rubber belt 6, a pair of left and right protrusions 6a for contacting the outer peripheral surfaces on both sides of the flange abutting surface of the flange portion 4 are formed over the entire circumference, and when the rubber belt 6 is tightened. The stress is concentrated on the protrusions 6a to improve the sealing property.

In the flange joint sealing tightening device, a pair of stainless belts 7 (an example of a ring-shaped member) which can be abutted against the outer peripheral surfaces of the rubber belt 6 on both sides of the flange abutting surface are provided, and the rubber belt 6 is a flange. A stainless belt 7 is provided so as to be pressed against the outer peripheral surface of the portion 4 and a tightening portion 8 is provided.

The stainless belt 7 has a wall thickness of 9 mm.
And the inner diameter is the same as the outer diameter of the flange 4 and is 800 mm.
And the stainless belt 7 is divided into a first stainless belt 7a and a second stainless belt 7b in the radial direction.
Opposing ends of a and 7b are connected to each other through the tightening portion 8.

As shown in FIGS. 1, 3 (a) and 3 (b), the tightening portion 8 includes the first and second stainless belts 7 a,
In order to pre-tighten the opposing ends of the first and second stainless belts 7a and 7b to the first and second tightening portion bodies 8a and 8b that are separately welded and fixed to the opposing ends of 7b. The first tightening mechanism 9 and the second tightening mechanism 10 for pulling the opposite ends to each other for final tightening are provided.

In the first tightening mechanism 9, the first and second stainless belts 7a, 7b are arranged so that the longitudinal central portions of the first and second stainless belts 7a, 7b and the vicinity thereof are along the outer peripheral surface of the flange portion 4. 7b for pulling the opposite ends of each other, and the first and second tightening part main bodies 8a, 8b.
In addition, the first bolt insertion holes 11 are concentrically formed, and the first bolt insertion holes 11 are inserted from the first tightening portion main body 8a to the second tightening portion main body 8b so as to pass through the first and second tightening portion main bodies 8a.
A first bolt B1 for pulling the tightening portion bodies 8a, 8b together, and a first nut N screwed to the first bolt B1.
1 is provided. The first bolt insertion hole 11
Is a long hole in the radial direction so that the first bolt B1 can move radially outward as the first and second tightening portion main bodies 8a and 8b are pulled by the first bolt B1 and the first nut N1. The first bolt insertion hole 11 is formed in the first and second tightening portion main bodies 8a and 8b in a notched shape so that the first bolt B1 can be inserted into the first bolt insertion hole 11 from the radial direction thereof. I am doing it.

The second tightening mechanism 10 has a structure that the first and second stainless belts 7a, 7a,
The second bolt insertion hole 12 is arranged on the inner side in the radial direction of 7b, and the second bolt insertion hole 12 is concentric with the portion of the first and second tightening portion bodies 8a, 8b on the inner side in the radial direction of the first bolt insertion hole 11. Second bolt B2 for forming the first tightening portion main body 8a and the second tightening portion main body 8b so that the first and second tightening portion main bodies 8a and 8b are drawn through the second bolt insertion holes 12 And a second nut N2 screwed onto the second bolt B2. Further, the second bolt insertion hole 12 has a second bolt B2 and a second nut N.
The second bolt B2 is formed into a long hole in the radial direction so that the second bolt B2 can be moved outward in the radial direction as the first and second tightening portion main bodies 8a and 8b are pulled toward each other.

The first and second tightening portion bodies 8a, 8b
Is formed thicker in the axial direction of the first and second bolt insertion holes 11 and 12 than in the portion provided with the second bolt insertion hole 12 than in the portion provided with the first bolt insertion hole 11. There is.

The method for sealing the flange joint portion of the gas conduit 1 by the tightening device for sealing the flange joint portion having the above-described structure is as follows. As shown in FIG.
Reference numeral 13 in FIGS. 4A and 4B is a rubber member for preventing gas leakage from the side surface of the flange portion 4. ) The first and second stainless steel belts 7a and 7b are respectively applied to the rubber belt 6, and the first nut N1 is screwed with respect to the first bolt B1, so that the longitudinal direction of the first and second stainless steel belts 7a and 7b. The end portions of the first and second stainless steel belts 7a and 7b facing each other are drawn together so that the central portion and the vicinity thereof are along the outer peripheral surface of the flange portion 4 and pre-tightened. Since the first bolt insertion hole 11 is formed as a long hole in the radial direction as described above, it is possible to easily allow the first bolt B1 to move outward in the radial direction due to this pulling. In addition, the first and second tightening portion main body 8
The portions where the first bolt insertion holes 11 of a and 8b are provided are
The first bolt, rather than the portion where the second bolt insertion hole 12 is provided,
Since the second bolt insertion holes 11 and 12 are formed to be thin in the axial direction and the length of the first bolt insertion hole 11 is set to be short, the first bolt insertion hole 11 on the first tightening portion main body 8a side is formed.
The first bolt insertion hole 11 on the side of the second tightening portion main body 8b can be made less likely to be misaligned, and the first bolt insertion hole 11 over the first and second tightening portion main bodies 8a and 8b can be inserted. It is possible to prevent the insertion work of the first bolt B1 from becoming difficult due to the misalignment of the first bolt insertion hole 11.

Then, the second nut N2 is screwed with respect to the second bolt B2 to draw the end portions of the first and second stainless belts 7a, 7b facing each other toward each other for final tightening (see FIG. B)). The portion where the second bolt insertion hole 12 of the first and second tightening portion main bodies 8a and 8b is provided is larger than the portion where the first bolt insertion hole 11 is provided. Since it is formed thick in the axial direction of the first and second tightening portion main bodies 8
Since a and 8b can maintain a stable posture with respect to the outer peripheral surface of the flange portion, they can be prevented from collapsing so as to bring their heads close to each other due to the pulling, and the first caused by such collapsing, It is possible to prevent the rubber belt 6 from being damaged at the corners of the base end portions of the second tightening portion bodies 8a and 8b.

After the final tightening, FIG. 3 (b) and FIG. 4 (b)
As shown in, the first bolt B1 and the first nut N1 are removed from the first and second tightening portion main bodies 8a and 8b. In this case, since the first bolt insertion hole 11 is formed in the cutout shape as described above, the first nut N1 is attached to the first bolt B1.
Simply loosen the screws to keep them together.
It can be detached from the second tightening portion main bodies 8a and 8b, and the detaching work can be easily performed.

[Other Embodiments] The size of the pipe 1 is not limited to that of the above embodiment, and can be applied to a small diameter pipe, for example. The pipe 1 may be a water and sewer pipe or another pipe.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a front view of a tightening device for sealing a flange joint of a pipe.

FIG. 2 is a perspective view showing a state in which a tightening device for sealing a flange joint portion of a pipe is attached to the pipe.

[Fig. 3] (a) A vertical sectional front view of the tightened portion showing the fully tightened state (b) A vertical sectional front view of the tightened portion showing the state where the first bolt is removed after the main tighten

[Fig. 4] (a) A vertical cross-sectional side view of an essential part showing a state before pre-tightening. (B) A vertical cross-sectional side view of the essential part showing a state where the first bolt is removed after the main tightening.

[Explanation of symbols]

1 tube 4 Flange part 6 Elastic strip 7 Ring-shaped member 7a First ring-shaped member 7b Second ring-shaped member 8 Tightening part 8a 1st tightening part body 8b Second tightening part body 9 First tightening mechanism 10 Second tightening mechanism 11 First bolt insertion hole 12 Second bolt insertion hole B1 1st bolt B2 Second bolt N1 first nut N2 second nut

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 23/036 F16L 23/04 F16L 23/16

Claims (4)

(57) [Claims] 1. The flange portions (4) of the pipes (1) adjacent to each other are butt-joined to each other, and the flange portions (4), so as to wrap around the flange butting surface peripheral portion.
An elastic strip (6) is wound around the outer peripheral surface of (4), and a pair of flexible ring-shaped members (7) are provided on both outer peripheral surfaces of the elastic strip (6) sandwiching the flange abutment surface. , (7)
And the ring-shaped members (7) and (7) are tightened to bring the elastic strips (6) into pressure contact with the outer peripheral surfaces of the flange portions (4) and (4), thereby forming a flange of the pipe. A method for sealing a flange joint portion of a pipe for sealing a joint portion, wherein the inner diameter of the ring-shaped member (7) is set to the flange portion (4),
The outer diameter of (4) is set to be approximately the same as the outer diameter of the ring member (4), and the ring member (7) is connected to the first ring member (7a) and the second ring member (7a).
A ring-shaped member (7b) is divided into two in the radial direction, and the elastic band-shaped body (6) wound around the outer peripheral surfaces of the flange portions (4) and (4) is wound around the first and second ring-shaped members ( 7a), (7
b) is applied to each of the first and second ring-shaped members (7a), (7b) so that the longitudinal center and the vicinity thereof are along the outer peripheral surfaces of the flanges (4), (4). The first and second ring-shaped members (7a) and (7b) are drawn together at their ends facing each other to be pre-tightened, and in the preliminary tightening, the inner side in the radial direction from the position where the opposite ends are drawn to each other. A method for sealing a flange joint portion of a pipe, in which the opposed ends are pulled together to be finally tightened at the point. 2. In a state where the flange portions (4) of adjacent pipes (1) are butted and connected to each other, the flange butting surface peripheral portion is wrapped around the flange portions (4),
With respect to the elastic strip (6) wound around the outer peripheral surface of (4), a pair of flexible strips can be attached to both outer peripheral surfaces of the elastic strip (6) sandwiching the flange abutment surface. A ring-shaped member (7), (7) is provided, and the ring-shaped member (7) can be freely tightened so that the elastic strip (6) is in pressure contact with the outer peripheral surface of the flange portion (4), (4). A tightening device for sealing a flange joint of a pipe provided with a tightening part (8), wherein the inner diameter of the ring-shaped member (7) is the flange part (4),
The outer diameter of (4) is set to be approximately the same as the outer diameter of the ring member (4), and the ring member (7) is connected to the first ring member (7a) and the second ring member (7a).
The ring-shaped member (7b) is divided into two in the radial direction, and the opposite ends of the first and second ring-shaped members (7a) and (7b) are connected to each other via the tightening portion (8). The first and second rings so that the longitudinal center portions of the first and second ring-shaped members (7a) and (7b) and the vicinity thereof are along the outer peripheral surfaces of the flange portions (4) and (4). Member (7a), (7b)
And a first tightening mechanism (9) for pulling together the opposite ends of each other for preliminary tightening, and arranged radially inward of the ring-shaped member (7) with respect to the first tightening mechanism (9). And a second tightening mechanism (10) for pulling the opposite ends to each other for final tightening, and a tightening device for sealing a flange joint of a pipe provided in the tightening part (8). 3. The first tightening mechanism (9) comprises first and second tightening provided separately at opposing ends of the first and second ring-shaped members (7a), (7b). The first bolt insertion hole (11) is concentrically formed in the part main bodies (8a), (8b), and the first bolt insertion hole is extended from the first tightening part main body (8a) to the second tightening part main body (8b). A first bolt (B) for inserting the first and second tightening portion main bodies (8a), (8b) by inserting them into the hole (11).
1) and a first nut (N1) screwed to the first bolt (B1) are provided, and the first and second tightening portion main bodies (the first bolt (B1) and the first nut (N1) are provided. 8a),
As (8b) is pulled, the first bolt (B
In the first tightening mechanism (10), the first bolt insertion hole (11) is formed in a long hole in the radial direction so that the first tightening mechanism (10) can move outward in the radial direction. The second tightening portion main body (8a), (8b), the second bolt in the radial inner side of the first bolt insertion hole (11)
The bolt insertion hole (12) is formed in a concentric shape, and is inserted through the second bolt insertion hole (12) from the first tightening portion main body (8a) to the second tightening portion main body (8b). A second bolt (B2) for pulling the second tightening portion main bodies (8a), (8b) together with the second bolt (B2).
2) is provided with a second nut (N2) screwed to
The first and second bolts (B2) and the second nut (N2)
As the tightening part bodies (8a) and (8b) are drawn closer, the second bolt (B2) is movable in the radially outward direction so that the second bolt insertion hole (12) is elongated in the radial direction. 3. A tightening device for sealing a flange joint portion of a pipe according to claim 2, wherein the tightening device is formed. 4. The first and second tightening part bodies (8a),
The portion of (8b) in which the second bolt insertion hole (12) is provided is more than the portion of the first and second bolt insertion hole (11) in which the first bolt insertion hole (11) is provided. (1
The tightening device for sealing a flange joint of a pipe according to claim 3, wherein the tightening device is formed thick in the axial direction of 2).