JP2020159383A - Branch pipe repair device - Google Patents

Abstract

To provide a branch pipe repair device having high work efficiency for repairing a branch pipe.SOLUTION: A branch pipe repair device P that repairs a branch pipe D branched from a fluid pipe W, comprises: a split structure 2 that has a base part 21 facing an outer surface on a branch pipe D side in the fluid pipe W, and an enclosure part 22 which is connected to the base part 21 and encloses at least a part of the outer peripheral surface of the branch pipe D, and in which a plurality of split members 2a are connected; a seal member S that is mounted to the split structure 2, and prevents fluid from leaking to the outside of the split structure 2; and a pulling member 31 that pulls the split structure 2 toward the fluid pipe W side along a pipe axis direction X of the branch pipe D.SELECTED DRAWING: Figure 5

Description

The present invention relates to a branch pipe repair device for repairing a branch pipe branched from a fluid pipe.

Conventionally, a branch pipe repair device for repairing a branch pipe has been known in order to prevent fluid leakage due to breakage of a connection portion between the fluid pipe and the branch pipe (see, for example, Patent Document 1).

Patent Document 1 includes a branch sealing member that integrates a ceiling wall forming plate portion having a through hole facing the outer peripheral surface of the flange portion of the branch pipe and a peripheral wall forming plate portion covering the outer peripheral surface of the branch pipe. A branch pipe repair device is disclosed (see the third embodiment). After welding and joining this branch sealing member along the outer peripheral surface of the fluid pipe, welding is performed between the through hole of the ceiling forming plate portion and the outer peripheral surface of the flange portion of the branch pipe, and the inside of the branch sealing member is filled with mortar. Is what you do.

Further, Patent Document 1 discloses a branch pipe repair device including a split joint body facing the outer peripheral surface of the fluid pipe and a branch cylinder portion connected to the split joint body and covering the outer peripheral surface of the branch pipe. (See the fourth embodiment). After connecting the split joint body and the branch pipe portion to the outer peripheral side of the fluid pipe and the branch pipe, mortar is placed between the outer peripheral surface of the fluid pipe and the split joint body and between the outer peripheral surface of the branch pipe and the branch cylinder portion. It is to be filled.

Japanese Unexamined Patent Publication No. 2009-24729

Since the branch pipe repair device described in Patent Document 1 fills the inside of the branch sealing member or the branch cylinder portion with mortar, if a fluid is present inside the branch pipe repair device, it is necessary to discharge the fluid to the outside. There was a problem, and the work efficiency was poor. Moreover, since the branch pipe is repaired using mortar, the repair of the branch pipe is not completed until the mortar solidifies, which requires a repair cost and a repair period.

Therefore, a branch pipe repair device having high work efficiency for repairing a branch pipe is desired.

The characteristic configuration of the branch pipe repair device according to the present invention is a branch pipe repair device for repairing a branch pipe branched from a fluid pipe, and the base portion of the fluid pipe facing the outer surface of the branch pipe side and the base portion thereof. A split structure that is connected and has a surrounding portion that surrounds at least a part of the outer peripheral surface of the branch pipe, and a plurality of split members are connected to the split structure, and is attached to the split structure to the outside of the split structure. The point is that the seal member for preventing the leakage of the fluid and the pulling member for pulling the divided structure toward the fluid pipe side along the pipe axis direction of the branch pipe are provided.

As in this configuration, the divided structure is composed of a plurality of divided members, and the divided structure surrounds at least a part of the outer peripheral surface of the branch pipe and the base facing the outer surface of the fluid pipe on the branch pipe side. Since it has and, the split structure can be mounted from the side of the branch pipe. Therefore, it is extremely easy to attach the split structure to the fluid pipe and the branch pipe.

Further, since the divided structure is equipped with a seal member for preventing fluid leakage from the outside of the divided structure, it is not necessary to fill the inside of the divided structure with mortar as in the conventional case, and the repair period is shortened. it can. Moreover, since the split structure is pulled toward the fluid pipe side along the pipe axis direction of the branch pipe by the pulling member, the posture of the split structure is stable and the sealing function by the sealing member can be properly maintained. ..

In this way, we were able to provide a branch pipe repair device with high work efficiency for repairing branch pipes.

The other characteristic configuration is that the tubular member arranged on the downstream side in the pipe axis direction from the branch pipe abuts on the protruding portion protruding in the out-of-diameter direction and is connected to the divided structure to cause the protrusion. The point is that a pressing member for pressing the portion toward the fluid pipe side is further provided.

As in this configuration, if the protruding portion of the tubular member arranged on the downstream side in the pipe axis direction is pressed by the pressing member, the branch pipe on the upstream side of the tubular member becomes the fluid pipe side. Is pressed against. As a result, it is possible to prevent the inconvenience that the branch pipe whose connection portion with the fluid pipe is damaged is separated from the fluid pipe due to the fluid pressure.

Another characteristic configuration is that a seal groove portion for accommodating the seal member is formed on the joint surface of the plurality of divided members along the pipe axis direction, and the plurality of the divided members are connected to the seal groove portion. The point is that there is a gap in the direction perpendicular to the pipe axis direction with respect to the seal member in the state before the sealing member.

In this configuration, among the seal grooves formed on the joint surfaces of the plurality of divided members, a gap in which the seal member that compresses and deforms when the plurality of divided members are connected can move in the direction perpendicular to the pipe axis direction of the branch pipe. Is forming. Therefore, the compression-deformed seal member does not irregularly protrude to the fluid pipe side, and the inconvenience of fluid leaking from between the fluid pipe and the base of the divided structure can be prevented.

Another characteristic configuration is that the pulling member is formed of a band member mounted along the outer circumference of the fluid pipe and fixed to both ends of the base.

If the pulling member is composed of band members fixed to both ends of the base of the split structure as in this configuration, the structure of the pulling member is extremely simple, and the length of the band member is simply changed. It can be adapted to fluid tubes of various diameters.

Another characteristic configuration is that the divided structure is configured to be stretchable along the pipe axis direction.

If the split structure is formed so as to be expandable and contractible along the pipe axis direction of the branch pipe as in this configuration, the surrounding area with respect to the outer peripheral surface of the branch pipe can be changed even if the length of the branch pipe and the repaired part are different. It becomes possible, and the divided structure can also be used.

It is a perspective view of the piping system before the branch pipe repair device is installed. It is a top view of the valve case division part. It is an enlarged vertical sectional view of a repair valve. It is a perspective view which shows the state which attached the branch pipe repair device. It is a half cross-sectional view which shows the state which attached the branch pipe repair device. It is a side view which shows the state which attached the branch pipe repair device. It is a figure which shows the divided structure. It is a figure which shows the state which the seal member is attached to the split member. It is a schematic diagram which shows the state which a seal member is compressed and deformed. It is an exploded perspective view of an annular member. It is a top view which shows the state which the annular member came into contact with the 2nd flange part of a short pipe. It is a front view which shows the state which attached the branch pipe repair device which concerns on another Embodiment 1. It is a vertical sectional view which shows the state which attached the branch pipe repair device which concerns on another Embodiment 1. It is an exploded perspective view of the annular member which concerns on another Embodiment 2. It is a perspective view which shows the state which attached the branch pipe repair device which concerns on another Embodiment 2. FIG. 5 is a plan view showing a state in which the annular member according to the second embodiment is in contact with the first partition portion of the valve box. It is a front view which shows the state which attached the branch pipe repair device which concerns on another Embodiment 3. It is a half cross-sectional view which shows the state which attached the branch pipe repair device which concerns on another Embodiment 4. It is a side view which shows the state which attached the branch pipe repair device which concerns on another Embodiment 4.

Hereinafter, embodiments of the branch pipe repair device according to the present invention will be described with reference to the drawings. In the present embodiment, as an example of the branch pipe repair device P, the branch pipe repair device P for repairing the branch pipe D branched from the water main pipe W (an example of a fluid pipe) will be described. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the gist thereof. In the following description, the pipe axis direction X of the branch pipe D shown in FIG. 1 will be described as the vertical direction, and the branch pipe D will be separated from the lower side (the side connected to the water main pipe W) to the upper side (separated from the water main main W). Since water (an example of fluid) circulates on the side of the water, it is sometimes referred to as the upstream side or the downstream side along the water flow direction.

As shown in FIG. 1, a branch pipe D is branched on the upper outer peripheral surface of the water main main W through which water flows. The connection portion between the water main main W and the branch pipe D is joined by welding or the like. At the end of the branch pipe D, a disk-shaped first flange portion 11 projecting in the outer diameter direction is formed.

A repair valve H is connected to the branch pipe D on the downstream side in the pipe axial direction X. As shown in FIGS. 1 to 3, the repair valve H includes a repair valve case composed of a short pipe T and a valve box V, a ball valve body Vb housed in the valve box V, and a ball valve body Vb. It has an operation unit 13 for opening and closing. A split portion 1 is formed between the valve box V and the short tube T to accommodate the ball valve body Vb.

At one end of the short pipe T, a disk-shaped second flange portion 12 to which the first flange portion 11 of the branch pipe D is attached is formed so as to project in the outer diameter direction of the short pipe T. At the other end of the short pipe T, a second split portion 1B to which the first split portion 1A of the valve box V is joined is formed so as to project in the outer diameter direction of the short pipe T. At one end of the valve box V, a first divided portion 1A to which the second divided portion 1B of the short pipe T is joined is formed so as to project in the out-of-diameter direction of the valve box V. At the other end of the valve box V, a disk-shaped third flange portion 15 to which a disk-shaped fourth flange portion 14a of a connecting pipe 14 such as an air valve or a work valve is attached protrudes in the outer diameter direction of the valve box V. It is formed.

The first divided portion 1A includes a first rectangular portion 1Aa protruding outwardly from one end of the valve box V in a rectangular cross section, and a plurality of first divided portions 1A protruding outwardly in a triangular cross section from one end of the valve box V (this implementation). In the form, it is composed of the first triangular portion 1Ab (three places). Similarly, the second divided portion 1B includes a second rectangular portion 1Ba protruding outwardly from one end of the short tube T in a rectangular cross section, and a plurality of second divided portions 1B protruding outwardly in a triangular cross section from one end of the short tube T. It is composed of a second triangular portion 1Bb (three locations in the present embodiment). An operation unit 13 capable of rotating the ball valve body Vb is connected to the first rectangular portion 1Aa and the second rectangular portion 1Ba.

As shown in FIGS. 2 to 3, a plurality of through holes 3a penetrating in the joining direction (tube axial direction X) are formed in the first divided portion 1A (in the present embodiment, two locations are formed in the first rectangular portion 1Aa). (3 locations in 1 triangular portion 1Ab) are formed so as to be separated in the circumferential direction. Further, in the second division portion 1B, a plurality of hole portions 3b penetrating in the joining direction (tube axial direction X) (in the present embodiment, two locations in the second rectangular portion 1Ba and three locations in the second triangular portion 1Bb). Are formed so as to be separated in the circumferential direction. A female threaded portion 3c is formed on the inner peripheral surface of each hole 3b, and the male threaded portion 4b is screwed into the female threaded portion 3c so that the bolt 4 does not protrude from the opening of the hole 3b. 1A and 1B are joined. That is, the head portion 4a of the bolt 4 is exposed on the outer surface 1a of the first division portion 1A, and the outer surface 1a of the second division portion 1B is formed of a flat surface on which the bolt 4 does not protrude. Although the bolt 4 in this embodiment shows an example of a bolt having a head portion 4a, it may be configured to tighten both screw bolts with nuts.

The first flange portion 11 of the branch pipe D and the second flange portion 12 formed at one end of the short pipe T are connected by a plurality of bolts 42a and nuts 42b (four locations in this embodiment). The fourth flange portion 14a of the connecting pipe 14 such as an air valve or a working valve and the third flange portion 15 formed at the other end of the valve box V are a plurality of bolts 41a and nuts 41b (four locations in this embodiment). It is connected by.

Since the connection portion between the branch pipe D and the water main main W is joined by welding, the connection portion may be damaged and water leakage may occur. In addition, a part of the outer peripheral surface may be damaged by the aged branch pipe D, and water leakage may occur. Therefore, in the present embodiment, the branch pipe D is repaired by the branch pipe repair device P.

(Basic configuration of branch pipe repair device)
As shown in FIGS. 4 to 6, the branch pipe repair device P includes a split structure 2 in which a plurality of (two in the present embodiment) split members 2a are connected, and a seal member mounted on the split structure 2. It includes S and a plurality of band members 31 (an example of the pulling member) that pull the split structure 2 toward the water main W side along the pipe axis direction X (two in this embodiment). The divided structure 2 is divided so that the joint surfaces of the pair of divided members 2a are along the pipe axis direction X. Further, the branch pipe repair device P is connected to the split structure 2 by the connecting mechanism 6, so that the second flange portion 12 of the short pipe T (an example of the tubular member arranged on the downstream side of the branch pipe D) An annular member 5 (an example of a pressing member) for pressing (an example of a protruding portion) toward the W side of the water main is provided.

The divided structure 2 includes a base portion 21 facing the upper side of the outer peripheral surface (outer surface on the branch pipe D side) of the water main main W and an extending portion 22 (surrounding portion 22) extending from the base portion 21 along the outer peripheral surface of the branch pipe D. It has an example of the part). The extending portion 22 surrounds at least a part of the outer peripheral surface of the branch pipe D including the connection portion between the water main main W and the branch pipe D.

The base portion 21 is a pair of bent portions 21a having an arcuate surface formed on the bottom surface along the outer peripheral surface of the water main W and bent from both ends of the arcuate portion 21a so as to be separated from the water main W. It has 21b and. The bent portion 21b is formed with a plurality of insertion holes 21b1 (four locations in the present embodiment) into which both end bolts 31a formed at both ends of the two band members 31, which will be described later, are inserted.

The extending portion 22 is formed from a cylindrical portion 22a facing the outer peripheral surface of the extending branch pipe D along the pipe axis direction X from the central portion of the arc-shaped portion 21a, and a portion straddling the arc-shaped portion 21a and the bent portion 21b. It has a pair of fastening portions 22b that project outward from both side surfaces of the extending cylindrical portion 22a along the pipe axis direction X. As described above, since the split structure 2 in the present embodiment is configured by connecting the pair of split members 2a, a plurality of fastening bolts 23a are inserted into the pair of fastening portions 22b, respectively. In the embodiment, fastening holes 22b1 are formed at two locations each). By tightening the fastening nut 23b to the fastening bolt 23a inserted into the fastening hole 22b1, the two dividing members 2a are tightened and fixed.

Further, the extending portion 22 has a flange portion 22c that extends in the axial direction Y of the water main main W across the cylindrical portion 22a and the fastening portion 22b. The flange portion 22c is formed in a hexagonal shape in which two opposite sides of a quadrangle are recessed inward in a top view, and a connecting hole portion 22c1 to which a connecting mechanism 6 is connected is formed at four corners protruding in the outward radial direction. Is formed (see the plane of FIG. 7).

The two split members 2a in the split structure 2 are each formed to have the same shape, and are fastened in a state of being inverted around the pipe axis direction X. In this way, the split structure 2 is composed of a plurality of split members 2a, and the split structure 2 faces the upper side of the outer peripheral surface of the water main main W and the extension portion 22 along the outer peripheral surface of the branch pipe D. Therefore, the split structure 2 can be mounted from the side of the branch pipe D. Therefore, it is extremely easy to attach the split structure 2 to the water main main W and the branch pipe D.

The outer surface and the inner surface of FIG. 7 show only one dividing member 2a. As shown on the inner surface of FIG. 7, a linear first seal groove 24 (an example of a seal groove portion) is formed on the joint surface of the dividing member 2a along the pipe axial direction X of the branch pipe D. Further, an arc-shaped second seal groove 25 is formed on the upper end portion of the inner surface of the dividing member 2a facing the outer peripheral surface of the branch pipe D. Further, as shown on the bottom surface of FIG. 7, an arc-shaped third seal groove 26 is formed on the bottom surface of the cylindrical portion 22a of the split structure 2 facing the upper side of the outer peripheral surface of the water main main W.

FIG. 8 shows a diagram in which the seal member S is mounted on the seal grooves 24, 25, 26 of the split member 2a. As shown in the figure, the first seal groove 24 is fitted with a linear first seal portion S1 protruding from the joint surface of the dividing member 2a. The second seal groove 25 is fitted with an arc-shaped second seal portion S2 that is brought into close contact with the outer peripheral surface of the branch pipe D by connecting the pair of split members 2a. The third seal groove 26 is fitted with an arc-shaped third seal portion S3 facing the upper side of the outer peripheral surface of the water main W. The first seal portion S1, the second seal portion S2, and the third seal portion S3 are integrally formed. In this way, since the split structure 2 is equipped with the seal member S that prevents water from leaking to the outside of the split structure 2, it is not necessary to fill the inside of the split structure 2 with mortar, and the repair period is extended. Can be shortened. Since the split structure 2 is made compact and the seal area on the water main W side is configured as the third seal portion S3 as a minimum as shown in FIG. 8, even if the outer diameter on the water main W side is different. The divided structure 2 can also be used. Further, if the volume of the third seal portion S3 is increased, it becomes possible to make close contact with the outer peripheral surface of the water main W having various curvatures, so that the range of combined use can be increased.

Further, the first seal groove 24 of the present embodiment is predetermined in a direction perpendicular to the pipe axis direction X and an in-diameter direction with respect to the first seal portion S1 in a state before the pair of dividing members 2a are connected. It has a gap E. Further, the third seal groove 26 of the present embodiment has a predetermined gap F along the circumferential direction with respect to the third seal portion S3 in a state before the pair of dividing members 2a are connected. ing.

As shown in FIG. 9, by connecting the pair of split members 2a, the first seal portion S1 protruding from the joint surface of the split members 2a is compressed, and the gap E in the in-diameter direction is filled against the water pressure. Move (bulge) to. As described above, since the first seal groove 24 has a gap E in the inner diameter direction to which the water pressure is applied, the first seal portion S1 is supported on the end face on the outer diameter side of the first seal groove 24. In this state, the amount of compression deformation of the first seal portion S1 is concentrated in the inward direction. Therefore, the first seal portion S1 is uniformly compressed and deformed, and the first seal portion S1 does not irregularly protrude to the water main W side, and the inconvenience of water leakage from between the water main W and the base 21 can be prevented. ..

Returning to FIGS. 4 to 6, each of the plurality of band members 31 includes a pair of insertion holes 21b1 formed in a bent portion 21b of the dividing member 2a with both end bolts 31a composed of male screws fixed by nuts 31b at both ends. It has a U-shaped portion 31c integrally formed with both end bolts 31a. Both end bolts 31a and the U-shaped portion 31c are integrally formed of a metal material such as stainless steel, and the U-shaped portion 31c is covered with an insulating material (resin or the like). The U-shaped portion 31c may not be covered with an insulating material, or the U-shaped portion 31c may be made of a belt or fiber material different from the bolts at both ends 31a, and the U-shaped portion 31c and the bolts at both ends 31a may be hooked. Etc. (see FIG. 12).

By tightening the bolts 31a at both ends with the nuts 31b at both ends, the band member 31 draws the bent portion 21b of the split member 2a arranged symmetrically with respect to the axial direction Y of the water main main W toward the water main W. .. As a result, the divided structure 2 in which the plurality of divided members 2a are connected is attracted to the water main W side along the pipe axial direction X of the branch pipe D. As a result, the third seal portion S3 mounted on the third seal groove 26 of each of the dividing members 2a is compressed so as to be in close contact with the upper side of the outer peripheral surface of the water main W, and the gap in the in-diameter direction is opposed to the water pressure. It moves (bulges) so as to fill F (see FIG. 8). As a result, it is possible to prevent the inconvenience of water leakage from between the water main W and the base 21 without irregularly deforming the third seal portion S3. At this time, since the band member 31 pulls the split structure 2 toward the water main W side along the pipe axis direction X of the branch pipe D, the posture of the split structure 2 is stable and the sealing function by the sealing member S is appropriate. Can be maintained at.

As shown in FIGS. 10 to 11, in the annular member 5, a plurality of (two in this embodiment) plate-shaped members 51 are connected by a bolt 61 and a nut 62 at a rotation fulcrum portion 52. The inner diameter of the annular member 5 is larger than the outer diameter of the short tube T. The pair of plate-shaped members 51 each have a main body portion 51a having an arcuate inner peripheral surface along the outer circumference of the short pipe T and a straight outer peripheral surface, and a first arm portion 51b extending from both ends of the main body portion 51a. It has a second arm portion 51c. Further, on both sides of the inner peripheral surface of the main body portion 51a, recessed portions 52a1 into which bolts 42a and nuts 42b for fastening the first flange portion 11 of the branch pipe D and the second flange portion 12 of the short pipe T are formed are formed. (See FIG. 11). The pair of plate-shaped members 51 in the present embodiment are connected by turning them upside down, and each plate-shaped member 51 has the same shape.

Two connecting holes 52a are formed at both ends of the pair of main body portions 51a, and connecting bolts 60A of the connecting member 60 described later are inserted into these connecting hole portions 52a. At the tip of the first arm 51b, a first step portion 51b1 having a thickness smaller on the tip side than the base end side connected to the main body 51a is formed. In a state where the pair of plate-shaped members 51 are connected, the first step portions 51b1 of the pair of first arm portions 51b face each other, and the operation portion 13 is arranged above the first step portion 51b1 ( (See FIG. 6).

At the tip of the second arm 51c, a second step portion 51c1 having a thickness smaller on the tip side than the base end side connected to the main body 51a is formed. The recessing direction (step-down direction) is opposite to that of the second step portion 51c1 and the first step portion 51b1 of the first arm portion 51b described above. As a result, when the pair of plate-shaped members 51 are turned upside down and connected, the plate surfaces of the respective plate-shaped members 51 can be positioned on the same plane.

As shown in FIGS. 4 to 6, in the connecting mechanism 6, the divided structure 2 and the annular member 5 are connected via a plurality of (four in the present embodiment) connecting members 60, and the divided structure 2 and the annular member 5 are annularly connected. The second flange portion 12 of the short pipe T is pressed toward the water main W side by applying a force in the direction of bringing the member 5 close to the member 5. The connecting member 60 is screwed into the connecting bolt 60A from the side of the connecting bolt 60A inserted from the side of the annular member 5 and the connecting hole portion 22c1 of the flange portion 22c formed in the extending portion 22 of the split structure 2. It has a connecting nut 60B.

By screwing the connecting bolt 60A and the connecting nut 60B, the annular member 5 approaches the side of the split structure 2 that is pulled and fixed to the water main W side, and the annular member 5 is the second short pipe T. (2) The flange portion 12 is pressed toward the water main W side. As a result, it is possible to prevent the inconvenience that the branch pipe D connected to the upstream side of the short pipe T is pressed toward the water main W side and the damaged branch pipe D is separated from the water main W due to water pressure.

Further, the connecting mechanism 6 further includes a plurality of (four in the present embodiment) spacing holding members 9 for keeping the spacing between the annular member 5 and the split structure 2 constant (see FIG. 10). The plurality of spacing members 9 in the present embodiment are composed of hollow cylindrical members of elastic materials (resin, rubber, etc.) separately attached to the outer periphery of the male threaded portion of each connecting bolt 60A. The length of the interval holding member 9 is such that when the annular member 5 is attached to the second flange portion 12 of the short pipe T and the split structure 2 is attached to the water main main W and the branch pipe D, the annular member 5 is attached. The distance between the lower surface and the upper surface of the flange portion 22c of the split structure 2 is set to be substantially the same (see FIG. 5). The interval holding member 9 can prevent the inconvenience of excessively pressing the branch pipe D toward the water main W side.

(How to install the branch pipe repair device)
Subsequently, a method of mounting the branch pipe repair device P will be described with reference to FIGS. 4 to 6. First, a pair of split members 2a are placed in contact with the outer peripheral surface of the branch pipe D and the upper side of the outer peripheral surface of the water main W from the side of the branch pipe D, and the pair of split members are arranged by the fastening bolt 23a and the fastening nut 23b. Tighten and fix 2a. As a result, the joint surfaces of the respective dividing members 2a are sealed by the first sealing portion S1, and the inner surface of each dividing member 2a and the outer peripheral surface of the branch pipe D are sealed by the second sealing portion S2. Next, with the U-shaped portions 31c of the two band members 31 along the outer peripheral surface of the water main W, both end bolts 31a are inserted into the insertion holes 21b1 of the bent portions 21b of the respective dividing members 2a, and both ends are inserted. The nut 31b is screwed into the bolts 31a at both ends and tightened. As a result, the split structure 2 is attracted to the water main W side by the band member 31 along the pipe axial direction X of the branch pipe D, and the third seal portion S3 is brought into close contact with the upper side of the outer peripheral surface of the water main W. As a result, water leakage to the outside of the divided structure 2 is prevented.

Next, the pair of plate-shaped members 51 of the annular member 5 are connected by the bolt 61 and the nut 62 at the rotation fulcrum portion 52 and opened, and are brought close to the second flange portion 12 of the short pipe T (see FIG. 10). ). Then, the pair of plate-shaped members 51 are brought into contact with the second flange portion 12 of the short pipe T, and the rotation fulcrum portion 52 is closed as the center. Next, a plurality of connecting bolts 60A are inserted into the connecting hole portion 52a from the side of the annular member 5, and the connecting bolt 60A is inserted into the connecting hole portion 22c1 of the flange portion 22c formed in the extending portion 22 of the split structure 2. Insert in. Then, the connecting bolt 60A is tightened from the side of the connecting hole portion 22c1 by the connecting nut 60B, and the annular member 5 is pulled toward the side of the split structure 2. As a result, the lower surface of the annular member 5 presses the outer surface of the second flange portion 12 downward. That is, the second flange portion 12 of the short pipe T is pressed toward the water main main W side along the pipe axial direction X by the annular member 5, and the branch pipe D connected to the short pipe T is prevented from coming off. .. Moreover, the annular member 5 also reinforces the joint surface between the second flange portion 12 of the short pipe T and the first flange portion 11 of the branch pipe D.

Hereinafter, only the configuration different from the above-described embodiment will be described with respect to another embodiment. In addition, in order to facilitate understanding of the drawings, the same members will be described using the same names and reference numerals.

(Separate Embodiment 1)
As shown in FIGS. 12 to 13, in the present embodiment, the divided structure 2A is configured to be expandable and contractible along the pipe axis direction X.

The split structure 2A is composed of a first split structure 2Aa and a second split structure 2Ab, and the second split structure 2Ab has a position relative to the first split structure 2Aa in the pipe axis direction X. It can be changed.

The first divided structure 2Aa has a first base 21A facing the upper side of the outer peripheral surface (outer surface on the branch pipe D side) of the water main W and a first extending from the first base 21A along the pipe axis direction X. It has an extending portion 22A (an example of a surrounding portion). The first base portion 21A is different in that the length of the bent portion 21Ab is shorter than the length of the bent portion 21b of the base portion 21 according to the above-described embodiment. Further, the first extending portion 22A is a distance between the cylindrical portion 22Aa and the outer peripheral surface of the branch pipe D with respect to the distance between the extending portion 22 and the outer peripheral surface of the branch pipe D according to the above-described embodiment. Is different in that it is large. Since the other configurations are the same, detailed description thereof will be omitted.

The second divided structure 2Ab has an annular second base portion 27 facing the inner peripheral surface of the first extending portion 22A and a second extension extending from the second base portion 27 along the outer peripheral surface of the branch pipe D. It has a protruding portion 28 (an example of a surrounding portion). Further, in the second divided structure 2Ab, a plurality of (two in the present embodiment) dividing members 2C are connected by a fastening bolt 23Aa and a fastening nut 23Ab. Further, the second split structure 2Ab is equipped with a seal member SA that prevents water from leaking to the outside of the split structure 2A. The seal member SA includes a fourth seal portion SA1 mounted on the outer peripheral surface of the second base portion 27, a fifth seal portion SA2 mounted on the joint surface of the pair of split members 2C, and a second extension portion 28. The sixth seal portion SA3 mounted on the inner peripheral surface near the upper end is mounted in a state of being integrated with each dividing member 2C.

The second base portion 27 has a diameter larger than the maximum diameter of the second extending portion 28, and a fourth seal groove 27a on which the fourth seal portion SA1 is mounted is formed along the outer peripheral surface. Further, an L-shaped fifth seal groove 28a on which the fifth seal portion SA2 is mounted is formed on the joint surface of the pair of split members 2C over the second base portion 27 and the second extension portion 28. There is. Further, a sixth seal groove 28b on which the sixth seal portion SA3 is mounted is formed on the inner peripheral surface of the upper end of the second extension portion 28. By connecting the first divided structure 2Aa and the second divided structure 2Ab, respectively, the fourth seal portion SA1 is compressed between the cylindrical portion 22Aa of the first extension portion 22A and the outer peripheral surface of the second base portion 27. At the same time, the sixth seal portion SA3 is compressed between the inner peripheral surface of the second extension portion 28 and the outer peripheral surface of the branch pipe D. As a result, the relative position of the second split structure 2Ab with respect to the first split structure 2Aa is fixed by the elastic restoring force of the fourth seal portion SA1 and the sixth seal portion SA3.

In the band member 31A (an example of a pulling member), the U-shaped portion 31Ac is made of a belt or fiber material different from the bolts at both ends 31Aa, and the U-shaped portion 31Ac and the bolts at both ends 31Aa are connected by a hook or the like. There is. As in the above-described embodiment, the bolts 31Aa at both ends and the U-shaped portion 31Ac may be integrally formed of a metal material such as stainless steel.

By forming the split structure 2A so as to be expandable and contractible along the pipe axis direction X of the branch pipe D in this way, even if the length of the branch pipe D and the repaired portion are different, the surrounding area with respect to the outer peripheral surface of the branch pipe D can be formed. It can be changed, and the divided structure 2A can also be used.

(Separate Embodiment 2)
As shown in FIGS. 14 to 16, instead of the annular member 5 described above, the first division portion 1A (an example of a protruding portion) of the valve box V (an example of a tubular member arranged on the downstream side of the branch pipe D) ) May be formed by an annular member 5A (an example of a pressing member).

In the annular member 5A, a plurality of (two in this embodiment) plate-shaped members 53 are connected by a bolt 63 and a nut 64 at a rotation fulcrum portion 54. The inner diameter of the annular member 5A is larger than the outer diameter of the valve box V. The plate-shaped member 53 has a main body portion 53a having an arc-shaped inner peripheral surface along the outer periphery of the valve box V and a straight outer peripheral surface, and a first arm portion 53b and a second arm portion extending from both ends of the main body portion 53a. It has 53c. The pair of plate-shaped members 53 in the present embodiment are connected by being turned upside down, and each plate-shaped member 53 has the same shape.

Two connecting holes 54a are formed at both ends of the main body 53a, and the connecting bolts 60A of the connecting member 60 described above are inserted into these connecting holes 54a. The pair of first arm portions 53b are separated from each other in a state where the pair of plate-shaped members 53 are connected to each other. When the annular member 5A is attached to the divided portion 1, the operating portion 13 is arranged between the pair of separated first arm portions 53b.

At the tip of the second arm 53c, a step portion 53c1 having a thickness smaller on the tip side than the base end side connected to the main body 53a is formed. A connecting hole portion 54b is formed in the step portion 53c1, and a bolt 63 is inserted into the connecting hole portion 54b. In a state where the pair of plate-shaped members 53 are connected by the connecting member 60, the step portions 53c1 of the pair of second arm portions 53c face each other. The pair of facing step portions 53c1 are configured as rotation fulcrum portions 54.

(How to install the branch pipe repair device)
A method of mounting the branch pipe repair device P will be described. Since the method of attaching the split structure 2 to the water main main W and the branch pipe D is the same as that of the above-described embodiment, detailed description thereof will be omitted.

After the split structure 2 is attached to the water main main W and the branch pipe D, the rotation fulcrum portions 54 of the pair of plate-shaped members 53 are connected by bolts 63 and nuts 64 (see FIG. 14). Next, with the pair of plate-shaped members 53 of the annular member 5A open about the rotation fulcrum portion 54, the annular member 5A is brought close to the first partition portion 1A of the valve box V. Then, the annular member 5A is brought into contact with the first partition portion 1A of the valve box V, and the rotation fulcrum portion 54 is closed as the center (see FIG. 15). Next, a plurality of connecting bolts 60A are inserted into the connecting hole portion 54a from the side of the annular member 5A, and the connecting bolt 60A is inserted into the connecting hole portion 22c1 of the flange portion 22c formed in the extending portion 22 of the split structure 2. Insert in. Then, the connecting bolt 60A is tightened from the side of the connecting hole portion 22c1 by the connecting nut 60B, and the annular member 5A is pulled toward the split structure 2. As a result, the lower surface of the annular member 5A presses the head portion 4a of the bolt 4 of the first partition portion 1A downward (see FIG. 16). That is, the first divided portion 1A of the valve box V is pressed toward the water main main W side along the pipe axial direction X by the annular member 5A, and the branch pipe D connected to the short pipe T is prevented from coming out. .. Moreover, the annular member 5A reinforces the split portion 1 for accommodating the ball valve body Vb formed between the valve box V and the short pipe T, and branches from the second flange portion 12 of the short pipe T. The joint surface of the pipe D with the first flange portion 11 is also reinforced.

(Separate Embodiment 3)
As shown in FIG. 17, instead of the band member 31 as the pulling member described above, in the present embodiment, the pulling member is composed of a plurality of (two in the present embodiment) split joints 32.

The split joint 32 is formed in a half-split shape along the outer peripheral surface of the water main W, and connecting flange portions 32a for fixed connection by bolts 56 and nuts 57 are formed at both ends. The pair of split joints 32 are fixedly connected by bolts 56 and nuts 57 with one connecting flange portion 32a facing each other, and the split joint 32 and the split structure 2 are connected to each other connecting flange portion 32a. The bent portion 21Ab of the base portion 21 is fixedly connected by bolts 56 and nuts 57. If the split structure 2 is fixed by the split joint 32 as in the present embodiment, the posture of the split structure 2 is more stable than that of the band member 31 described above.

(Separate Embodiment 4)
As shown in FIGS. 18 to 19, in this embodiment, a plurality of band members 31B are used instead of the plurality of band members 31 as the pulling members described above. Further, the plurality of connecting members 60 are each composed of a connecting bolt 60C composed of threaded rods and two connecting nuts 60D screwed to both ends of the connecting bolt 60C. Further, in the present embodiment, the bent portion 21b of the base portion 21 is omitted.

The plurality of band members 31B are fixed by a U-shaped portion 31Bc in which the central portion is locked (fixed) to the end portion of the arcuate portion 21a of the dividing member 2a in the axial center direction Y, and nuts 31Bb at both ends. It has both end bolts 31Ba made of male threads and a support member 31Bd that connects and supports a pair of both end bolts 31Ba along the axis direction Y on the pipe bottom side of the water main W. As a form in which the central portion of the U-shaped portion 31c is locked (fixed) to the arc-shaped portion 21a, a groove portion 21a1 may be provided at the end portion of the arc-shaped portion 21a in the axial direction Y, or the arc-shaped portion 21a may be provided. 21a2 may be formed so as to project from the end portion in the axial direction Y of the above. In the present embodiment, as described above, it is not necessary to provide a pair of bent portions 21b bent from both ends of the arcuate portion 21a, so that the dimension of the branch pipe repair device P in the axial center direction Y can be reduced.

[Other Embodiments]
(1) The branch pipe repair device P in the above-described embodiment may be attached to the branch pipe D branched from the side surface of the water main main W.
(2) The first seal groove 24 in the above-described embodiment has a gap E in the inner diameter direction, but instead of this, a gap E may be provided in the outer diameter direction. Similarly, there may be a gap F in the outer diameter direction of the third seal groove 26.
(3) The pressing member in the above-described embodiment is not limited to the annular members 5 and 5A, and any structure can press the second flange portion 12 of the short pipe T and the first divided portion 1A of the valve box V. It may be in such a form. For example, a plurality of pressing members separated from each other in the circumferential direction may be used. Further, the annular members 5, 5A may be brought into contact with the fourth flange portion 14a of the connecting pipe 14, and the fourth flange portion 14a may be pressed toward the water main W side, and the protruding portion is formed by the annular members 5, 5A. The configuration is not particularly limited as long as it is configured to press the water main W side.
(4) Although the divided structure 2 in the above-described embodiment is composed of a pair of divided members 2a, it may be composed of three or more divided members 2a. Further, although the divided structure 2A in the first embodiment is composed of two divided structures 2Aa and 2Ab, it may be composed of three or more divided structures.
(5) The interval holding member 9 in the above-described embodiment may be omitted.
(6) The above-described embodiments can be combined as appropriate. For example, the band member 31A of the separate embodiment 1 may be configured by the band member 31B of the separate embodiment 4, or the connecting bolt 60A of the connecting member 60 may be configured by the threaded rod as in the separate embodiment 4. Is also good.
(7) The branch pipe repair device P in the above-described embodiment is not limited to the case where it is used to prevent water leakage from the branch pipe D, but is used to prevent leakage of other liquids or gases from the branch pipe D. You may.

The present invention can be used as a branch pipe repair device for repairing a branch pipe branched from a fluid pipe.

2: Divided structure 2a: Divided member 5: Circular member (pressing member)
12: Second flange part (protruding part)
21: Base 22: Extension (surrounding part)
24: First seal groove (seal groove)
31: Band member (pulling member)
D: Branch pipe E: Gap P: Branch pipe repair device S: Seal member T: Short pipe (cylindrical member)
W: Water main (fluid pipe)
X: Pipe axis direction

Claims (5)

A branch pipe repair device that repairs a branch pipe branched from a fluid pipe.
A division having a base portion of the fluid pipe facing the outer surface on the branch pipe side and a surrounding portion connected to the base portion and surrounding at least a part of the outer peripheral surface of the branch pipe, and a plurality of division members are connected to each other. Structure and
A seal member that is attached to the split structure and prevents fluid from leaking to the outside of the split structure.
A branch pipe repair device including a pulling member that pulls the divided structure toward the fluid pipe side along the pipe axis direction of the branch pipe. The protruding portion is brought into contact with the protruding portion of the tubular member arranged on the downstream side in the pipe axis direction from the branch pipe in the out-of-diameter direction and connected to the divided structure so that the protruding portion is connected to the fluid pipe side. The branch pipe repair device according to claim 1, further comprising a pressing member for pressing against. A seal groove portion for accommodating the seal member is formed on the joint surface of the plurality of divided members along the pipe axis direction.
The branch pipe according to claim 1 or 2, wherein the seal groove portion has a gap in a direction perpendicular to the pipe axis direction with respect to the seal member in a state before the plurality of the dividing members are connected. Repair equipment. The branch pipe repair device according to any one of claims 1 to 3, wherein the pulling member is attached along the outer circumference of the fluid pipe and is composed of a band member fixed to both ends of the base portion. .. The branch pipe repair device according to any one of claims 1 to 4, wherein the divided structure is configured to be expandable and contractible along the pipe axis direction.

Images