JPS6246073Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a method to cover and seal the leakage part with a sealant when a part of a conduit or a pipe joint that guides a fluid such as gas or liquid is damaged and the fluid leaks. This invention relates to a structure that prevents leakage by using a sealant cover used in the invention.

In a typical prior art technique, as shown in Japanese Patent Application Laid-Open No. 53-6922, the sealant cover is divided into upper and lower halves, and the upper and lower halves are joined using bolts, and the upper half is A single injection cylinder is formed in the split part,
The injection barrel is configured to be able to be closed with a lid.

In such prior art, when a sealant cover is used to cover a part of a conduit or a pipe joint where leakage is expected, the lower half is supported by hand, and the upper half is used with the aforementioned bolts. Therefore, workability is poor. This is particularly a problem in leakage prevention work for underground pipes.

Another problem with this prior art is during injection of the sealant. When injecting the sealant from the injection barrel, the air in the space inside the sealant cover must be exhausted to the outside from the injection barrel, otherwise the sealant will be reliably filled into the sealant cover. First, leakage cannot be reliably prevented, and the sealant cannot be quickly injected and filled from the injection cylinder, making it impossible to ensure leakage prevention.

The prior art also encounters other problems. When the filled sealant hardens, its volume shrinks slightly. Such a sealant is, for example, a polyurethane resin. When the sealant contracts during hardening, there is a risk that the hardened sealant may separate from the outer peripheral surface of a portion of the conduit or the pipe joint, and therefore leakage cannot be reliably prevented. Furthermore, due to the creation of voids in the sealant cover, the sealant cover may be deformed by the pressure of underground earth and sand, and therefore cracks may occur, especially in winter.

The purpose of this invention is to be able to easily cover parts of conduits, pipe joints, etc., and to provide excellent workability.
Leakage prevention using a sealant cover that prevents air from remaining when the sealant is filled inside, and also prevents voids from forming inside the sealant cover even if the sealant hardens and contracts. It's about providing structure.

The present invention airtightly encloses a leakage point such as a conduit or a pipe joint with a sealant cover 5 with a space 8 from the outer periphery of the leakage point, and fills the space 8 with a hardening sealant. In the leak-prevention structure using a sealant cover made of This sealant cover is made of a synthetic resin having a certain degree of rigidity, and includes a right cylindrical large-diameter portion 10 and a conical cone having a small diameter that extends to both ends of the large-diameter portion 10 in the axial direction and protrudes outward in the axial direction. Base parts 13, 14
and a right cylindrical small diameter portion 1 that is connected to the small diameter end portions of the truncated conical portions 13 and 14 and extends outward in the axial direction.
1, 12, a large diameter portion 10, truncated conical portions 13, 14, and a small diameter portion 1.
1 and 12 are separated at one point in the circumferential direction within the plane of symmetry, and include the large diameter portion 10, the truncated conical portions 13 and 14, and the small diameter portion 1.
1 and 12, a pair of joint flanges 15 and 16 that protrude outward in the radial direction and are opposed to each other.
are formed extending in the axial direction, and a plurality of engagement holes 17 are bored in the joint flanges 15 and 16 at mutually corresponding positions at intervals along the axial direction, and the engagement holes 17 A synthetic resin hook 18 is inserted through the hook 18, and the hook 18 has a conical end portion 18a having a maximum diameter slightly larger than the engagement hole 17, and a disc-shaped head portion having a diameter larger than the engagement hole 17. 18c, and a shaft portion connected across the conical end portion 18a and the disc-shaped head portion 18c, and this shaft portion is commonly inserted through two corresponding engagement holes 17 to form a pair of joints. The flanges 15 and 16 are connected to the locking surface 18b of the conical end portion 18a on the shaft side and the disc-shaped head portion 18c.
and are clamped and joined together, extending over the entire length of the large diameter portion 10 and the truncated conical portions 13, 14 in the axial direction, and opposite to the joining flanges 15, 16 with respect to a plane passing through the axis and perpendicular to the plane of symmetry. A plurality of bulges 1 are formed at intervals in the circumferential direction in the side range.
9, 19a are formed, and each bulging portion 19, 19a has an outwardly convex semicircular arc cross section perpendicular to the axis, and the radius of curvature of each bulging portion 19, 19a is equal to that of the large diameter portion 1.
0, and the truncated conical portions 13 and 14 are made smaller toward the small diameter portions 11 and 12, and one of the bulged portions 19, 19a, is on the plane of symmetry, and this 1 From the outer periphery on the truncated conical parts 13 and 14 of the two bulging parts 19a
Projections 25 and 26 are formed that extend over 1 and 12, and the length l2 of the small diameter portions 11 and 12 and the projections 25 and 26 in the axial direction is equal to the length l1 of the bulges 19 and 19a in the axial direction. The joint flanges 15, 16 and the protrusions 25, 26 in the small diameter portions 11, 12 have holes 28, 29 that are longer than the axial length l1 of the bulged portions 19, 19a. Tightening belts 27 circumferentially surrounding the small diameter portions 11 and 12 are inserted into these holes 28 and 29, respectively, and tightening belts 27 are inserted into the inner peripheral surfaces of the small diameter portions 11 and 12. Sponge-like band-shaped sealing members 22 and 23 are attached to the corresponding positions directly below the belt 27, extending in the circumferential direction, and the space 8 is provided near both circumferential ends of the large diameter portion 10.
A pair of short pipes 30 and 31 are connected to each other outwardly with their axes parallel to the plane of symmetry, and these short pipes 30 and 31 are offset in the axial direction of the large diameter portion 10. The short pipes 30 and 31 are provided with an external thread 32, and a bottomed cylindrical cap 34 having an internal thread 33 that is screwed into the external thread 32. A projection 35 made of an elastic material is attached to the cap 34 to be inserted into the short pipes 30 and 31, and includes a large diameter portion 10, a small diameter portion 11 and 12, and a truncated conical portion
3 and 14 and the bulging portions 19 and 19a have a leak-preventing structure using a sealant cover characterized by uniform thickness.

FIG. 1 is a sectional view of an embodiment of the present invention. The conduits 2 and 3 buried in the ground 1 are for transporting fluids such as gas and liquid, each having an axis in a straight line, and are connected by a pipe joint 4. If a fluid leak occurs at a pipe joint 4, the vicinity of the pipe joint 4 is dug up and the leaking pipe joint 4 and its vicinity are made liquid-tight using the sealant cover 5 of the present invention. encircle A filling device 6 containing a sealant is installed on the ground surface. By this filling device 6, the sealant is filled into a sealant filling space 8 surrounding the outside of the pipe joint 4 in the sealant cover 5 through a conduit 7 such as a rubber hose. The filled sealant hardens over time and seals the leakage site. The sealing agent used is, for example, a liquid material prepared by kneading a base material and a curing agent, which hardens over time and seals the leakage area, such as a polyurethane resin.

FIG. 2 is a front view of the sealant cover 5,
Figure 3 is its rear view, Figure 4 is its right side view, Figure 5 is its left sectional view, Figure 6 is its top view, and Figure 7 is its bottom view. 8 is a sectional view taken along the cutting plane line - in FIG. 4. The sealant cover 5 is integrally molded from a synthetic resin such as polyethylene or polypropylene, and its rigidity is determined by the fact that the sealant is filled in the sealant filling space 8 to cover the leakage points such as the pipe joints 4, and the sealant is filled underground. A value that is not substantially deformed by earth and sand when embedded in the soil (e.g., tensile strength of 140 kg/ ^cm2 or more, elongation of 50% or more, shore hardness of approx.
95). The shower agent cover 5 basically has a cylindrical shape that is symmetrical with respect to a vertical plane of symmetry including the axis, and extends outward in the axial direction from both ends of the large diameter portion 10 in the axial direction via the truncated conical portions 13 and 14. It has a shape that is continuous with right cylindrical small diameter portions 11 and 12 extending in the same direction, and is separated at one point in the circumferential direction within the plane of symmetry. The sealing agent cover 5 can be opened and closed around an axis parallel to the tube axis so that both circumferential ends thereof can be moved toward and away from each other. The truncated conical portions 13 and 14 protrude outward in the axial direction and have a small diameter.

The large diameter portion 10 has a right cylindrical shape, has a larger diameter than the outer diameter of the pipe fitting 4, and is therefore surrounded by a distance d (see Fig. 8) from the outer circumference of the pipe fitting 4 and its vicinity. be able to. Attach the sealant cover 5 to the leakage point with it open, and after attaching it, contact both ends of the sealant cover 5 in the circumferential direction in a liquid-tight manner.
A sealing agent filling space 8 is formed.

At both ends in the circumferential direction of the sealant cover 5, projecting outward in the radial direction of the conduits 2, 3 and the pipe fitting 4,
Joint flanges 15 and 16 which are in surface contact with each other are formed, respectively. The joining flanges 15 and 16 extend over the entire length of the sealant cover in the axial direction. A plurality of engagement holes 17 (10 in the figure) are formed at mutually corresponding positions in both the joint flanges 15 and 16 at intervals along the axial direction. Referring to FIG. 9, both joining flanges 15, 16 are joined with a hook 18 made of synthetic resin. The maximum diameter of the conical end portion 18a of the hook 18 is slightly larger than the engagement hole 17, and a locking surface 18b is formed. Hock 18 is
While bending the conical end portion 18a, the engagement hole 17
pushed into. The hook 18 is passed through the engagement hole 17, and the joint flanges 15 and 16 are clamped between the locking surface 18b of the conical end portion 18a and the disc-shaped head 18c having a larger diameter than the engagement hole 17. Join. A shaft portion connected to the conical end portion 18a and the disc-shaped head portion 18c is commonly inserted into the two corresponding engagement holes 17.

A plurality of (seven shown) bulges 1 extend along the entire length of the large diameter portion 10 and the truncated conical portions 13 and 14 in the axial direction.
9 and 19a are formed at intervals in the circumferential direction.
Of the bulges 19 and 19a, the sealant cover 5
The bulging portion 19a formed on a diameter line passing through both ends in the circumferential direction, that is, on the symmetry plane, has an outwardly convex semicircular arc cross section perpendicular to the axis of the sealant cover 5. The radius of curvature of the bulging part 19a is the same in the large diameter part 10, and the radius of curvature of the bulging part 19a is the same in the large diameter part 10, and
4, the diameter becomes smaller toward the small diameter portions 11 and 12. The other bulges 19 are also formed in the same manner as the bulge 19a. truncated cone part 1
Since the radius of curvature of the bulging portions 19, 19a in 3, 14 becomes smaller toward the small diameter portions 11, 12, the protruding length l1 (see Fig. 2) of the bulging portions 19, 19a along the axis is shortened. can do.
Therefore, the length l2 along the axis of the small diameter portions 11 and 12 can be shortened, and the entire structure can be made compact. The bulging parts 19 and 19a are the large diameter part 1
0 axis and is formed in a range on the opposite side of the joining flanges 15 and 16 with respect to a plane perpendicular to the plane of symmetry. The holes 28 and 29 are formed at positions further outward in the axial direction than the axial length l1 of the bulged portions 19 and 19a. These holes 28, 29 have small diameter portions 11,
A tightening belt 27 that circumferentially surrounds 12 is inserted through each of them as will be described later. seal member 22,
23 is attached to a corresponding position immediately below the tightening belt 27 so as to extend in the circumferential direction.

Large diameter part 10, small diameter parts 11, 12, truncated conical part 1
3, 14 and the bulge 19 are formed with uniform thickness.

Since the bulge 19 projects radially outward, it does not reduce the effective sealant thickness d.

Both circumferential ends of the sealant cover 5 are opened in the direction of separation from each other. At this time, the plurality of bulging portions 19 are bent so that the circumferential length of the large diameter portion 10 is shortened to match the circumferential length of the small diameter portions 11 and 12. That is, both circumferential ends 20 and 21 (see FIG. 8) of the bulging portion 19 are close to each other. Therefore, the sealant cover 5 having rigidity can be opened easily, that is, with a small amount of human power, with a large gap between both ends of the sealant cover 5 in the circumferential direction.

The small diameter portions 11 and 12 are connected to the conduit 3 and the pipe fitting 4 via seal members 22 and 23 made of airtight sponge.
surround. The sealing members 22 and 23 are strip-shaped and are previously attached to the inner periphery of the small diameter portions 11 and 12 using an adhesive such as a commercially available double-sided adhesive tape.

The small diameter portions 11 and 12 are formed with protrusions 25 and 26 that protrude in the radial direction and extend in the axial direction. The joint flanges 15, 16 and the projecting pieces 25, 26 are provided with holes 28, 29 on the outer periphery of the small diameter portions 11, 12, through which a tightening belt 27, shown in phantom, is passed. The small diameter portions 11 and 12 are attached to the tightening belt 2.
7, the seal portions 22, 2
3 is compressed and fixed to the outer periphery of the conduit 3 and the pipe fitting 4. Therefore, movement of the sealant cover 5 in the tube axis direction is prevented, and the sealing member 22,
23 is in close contact with the outer periphery of the conduit 3 and the pipe joint 4, improving sealing performance. The sealing member 22,
A seal can be achieved reliably by compression of 23.

Near both ends of the large diameter portion 10 in the circumferential direction, short pipes 30 and 31 communicating with the sealant filling space 8 are arranged outwardly, respectively, with axes parallel to the plane of symmetry. The short pipe 30 is provided with an external thread 32,
A tenth screw having an internal thread 33 screwed into the external thread 32
It is closed with a cap 34 as shown. The short tube 31 is similarly closed with a cap 34. cap 3
A protrusion 35 made of an elastic material such as sponge, which is inserted into the short tubes 30 and 31, is attached to the tube 4. After filling the sealant, when the short tubes 30, 31 are closed with the cap 34, the protrusion 35 presses the sealant in both the short tubes 30, 31 and therefore in the sealant filling space 8. Therefore, the sealing agent penetrates even into the minute recesses of the pipe joint 4, and sealing is performed reliably. Note that the sealant may be injected from either of the short pipes 30 and 31, and when one is used for injecting the sealant, the other functions as an air vent from the sealant filling space 8. The short pipes 30, 31 are arranged in the axial direction of the large diameter portion 10, that is, in FIGS.
It is shifted from left to right in the figure. These short tubes 30,
31 have the same length, so that the short tube 3
The upper end portions of 0 and 31 are in a common horizontal plane when filling the sealant.

In the above embodiment, sealing was achieved in connection with leakage from the pipe joint 4, but even if fluid leaks due to breakage or the like in the middle of the conduits 2 and 3, the seal can be achieved in exactly the same way. Able to implement ideas.

As described above, according to the present invention, a sealant cover for airtightly enclosing a leakage point such as a conduit or pipe joint at a distance from its outer periphery can be substantially removed by using earth and sand buried underground. Since it is made of synthetic resin that has enough rigidity to prevent deformation, the sealant is prevented from curing while the cover remains deformed by the pressure of earth and sand.

In particular, according to the present invention, the sealant cover is separated at one point in the circumferential direction, and the separated portion can be expanded by the bulging portions 19, 19a. Therefore, in this expanded state, with the separated part facing downward, a part of the underground pipe or pipe fitting etc. is inserted from above, and in this state, the sealant cover is angularly displaced by 180 degrees. This allows the separated parts to face upward. In this way, it becomes easy to attach the sealant cover to a part of a conduit or a pipe joint, and work can be carried out efficiently even in a narrow space.

The truncated conical portions 13 and 14 protrude outward in the axial direction and have a small diameter, and the bulging portions 19 and 19a pass through the axis of the large diameter portion 10 and are arranged in a plane perpendicular to the plane of symmetry (Figs. 2 to 5). and a plane extending left and right passing through the axis of the large-diameter portion 10 in FIG.
It is formed within the range of . Therefore, when the sealant is injected from the pair of short pipes 31 or 32, the air in the space 8 is reliably discharged to the outside by the sealant, and air is prevented from remaining in the space 8. .

The large diameter portion 10 can expand in the radial direction by the bulging portions 19 and 19a, and the cap 34
A protrusion 35 made of an elastic material is attached to the short tubes 30 and 31.
5, the sealant in the space 8 is filled in a pressed state. Therefore, even if the sealant hardens and contracts, the large diameter portion 10 etc. can be reduced accordingly. Therefore, no gap is created between the sealant and the outer circumferential surface of a portion of the conduit or the pipe joint, and no gap is generated between the sealant and the inner circumferential surface of the sealant cover. Therefore, leakage can be reliably prevented.

Jointed flange 15, 1 by synthetic resin hook 18
Since the joint collars 15 and 16 are inserted into the engagement hole 17 drilled in the joint collar 1, the joint collars 15 and 16 are joined.
The joining work of steps 5 and 16 can be carried out quickly.
This also improves workability.

The bulges 19, 19a have an outwardly convex semicircular arc cross section perpendicular to the axis, and therefore the bulges 19, 19a
This prevents air from remaining in the sealant 19a when filling the sealant, and also prevents the swollen portion 19,
It becomes possible to reliably fill the sealant into the interior of the sealant 19a. Further, the strength of the bulging portions 19, 19a does not decrease.

The radius of curvature of the bulging portions 19 and 19a is the truncated cone portion 1
3 and 14 are made smaller toward the small diameter portions 11 and 12, so that the length l2 of the small diameter portions 11 and 12 can be made as small as possible as described above, and miniaturization becomes possible.

One bulge 19a of the bulges 19 extends from the outer periphery on the truncated conical portions 13 and 14 to the small diameter portion 11,
Since it is continuous with the protrusions 25 and 26 that extend over 12, the strength of these protrusions 25 and 26 is improved and it is easy to mold them with synthetic resin.

Another function of the bulging portions 19 and 19a is to enable deformation of the large diameter portion 10 even in winter, thereby preventing cracking at low temperatures.

Near both circumferential ends of the large diameter portion 10, a pair of short pipes 30, 31 communicating with the space 8 have axes parallel to the plane of symmetry and communicate outward, respectively.
It is shifted in the axial direction of the large diameter portion 10. Therefore, the joining flanges 15, 1 are inserted into the engagement holes 17 of the joining flanges 15, 16.
6 can be easily pressed and fitted from one side.

The short pipes 30 and 31 have the same length, so when sealant is injected from one short pipe 30 or 31, the sealant is discharged from the other short pipe 31 or 30. In this way, the sealant can be reliably filled up to the ends of the short tubes 30 and 31. By subsequently attaching the cap 34, it becomes possible to seal the sealant in the space 8 under pressure.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a front view of the sealant cover 5 shown in FIG. 1, FIG. 3 is a rear view of FIG. 2, and FIG. right side view,
Fig. 5 is a left side view of Fig. 2, Fig. 6 is a plan view of Fig. 2, Fig. 7 is a bottom view of Fig. 2, and Fig. 8 is a sectional view taken along the cutting plane line - of Fig. 4. , FIG. 9 is a cross-sectional view showing the joined state of the joining flanges 15 and 16, and FIG. 10 is a cross-sectional view of the cap 34. 2, 3...Conduit, 4...Pipe fitting, 5...Sealant cover, 8...Sealant filling space, 10...
...Large diameter part, 11, 12...Small diameter part, 13, 14...
... truncated conical part, 15, 16 ... joint flange, 17 ... engagement hole, 18 ... hook, 19, 19a ... bulge section, 22, 23 ... sealing member, 27 ... tightening belt, 28 , 29... hole, 30, 31... short tube, 34... cap.

Claims (1)

[Claims for Utility Model Registration] A leakage location such as a conduit or a pipe joint is airtightly surrounded by a sealant cover 5 with a space 8 from the outer periphery of the leakage location, and a sealant that can be hardened is placed in the space 8. In a leak-prevention structure using a sealant cover filled with a sealant, the sealant cover is symmetrical with respect to a plane of symmetry passing through its axis, and when buried underground, it is substantially protected by earth and sand. The sealant cover is made of a synthetic resin having a rigidity that does not deform on the surface, and includes a right cylindrical large diameter portion 10, and a sealing agent cover that is connected to both ends of the large diameter portion 10 in the axial direction, and protrudes outward in the axial direction. truncated conical portions 13 and 14 with a small diameter
and a right cylindrical small diameter portion 1 that is connected to the small diameter end portions of the truncated conical portions 13 and 14 and extends outward in the axial direction.
1, 12, a large diameter portion 10, truncated conical portions 13, 14, and a small diameter portion 1.
1 and 12 are separated at one point in the circumferential direction within the plane of symmetry, and include the large diameter portion 10, the truncated conical portions 13 and 14, and the small diameter portion 1.
A pair of joint flanges 15 and 16 that protrude outward in the radial direction and are opposed to each other are provided at both ends in the circumferential direction of the joint flanges 1 and 12.
are formed extending in the axial direction, and a plurality of engagement holes 17 are bored in the joint flanges 15 and 16 at mutually corresponding positions at intervals along the axial direction, and the engagement holes 17 A synthetic resin hook 18 is inserted through the hook 18, and the hook 18 has a conical end portion 18a having a maximum diameter slightly larger than the engagement hole 17, and a disc-shaped head portion having a diameter larger than the engagement hole 17. 18c, and a shaft portion connected across the conical end portion 18a and the disc-shaped head portion 18c, and this shaft portion is commonly inserted through two corresponding engagement holes 17 to form a pair of joints. The flanges 15 and 16 are connected to the locking surface 18b on the shaft side of the conical end portion 18a and the disc-shaped head portion 18c.
and are clamped and joined together, spanning the entire length of the large diameter portion 10 and the truncated conical portions 13, 14 in the axial direction, and opposite to the joining flanges 15, 16 with respect to a plane passing through the axis and perpendicular to the plane of symmetry. A plurality of bulges 1 are formed at intervals in the circumferential direction in the side range.
9, 19a are formed, and each bulging portion 19, 19a has an outwardly convex semicircular arc cross section perpendicular to the axis, and the radius of curvature of each bulging portion 19, 19a is the same as that of the large diameter portion 1.
0, the truncated conical portions 13 and 14 are made smaller toward the small diameter portions 11 and 12, and one of the bulged portions 19, a bulged portion 19a, is on the plane of symmetry; From the outer periphery on the truncated conical parts 13 and 14 of the two bulging parts 19a
Projections 25 and 26 are formed that extend over 1 and 12, and the axial length l2 of the small diameter portions 11 and 12 and the projections 25 and 26 is equal to the axial length l1 of the bulged portions 19 and 19a. The joint flanges 15, 16 and the projections 25, 26 in the small diameter portions 11, 12 have holes 28, 29 that are longer than the axial length l1 of the bulged portions 19, 19a. Tightening belts 27 circumferentially surrounding the small diameter portions 11 and 12 are inserted into these holes 28 and 29, respectively, and tightening belts 27 are inserted into the inner peripheral surfaces of the small diameter portions 11 and 12. Sponge-like band-shaped sealing members 22 and 23 are attached to the corresponding positions directly below the belt 27, extending in the circumferential direction, and the space 8 is provided near both circumferential ends of the large diameter portion 10.
A pair of short pipes 30 and 31 are connected to each other outwardly with their axes parallel to the plane of symmetry, and these short pipes 30 and 31 are offset in the axial direction of the large diameter portion 10. The short pipes 30 and 31 are provided with an external thread 32, and a bottomed cylindrical cap 34 having an internal thread 33 that is screwed into the external thread 32. A projection 35 made of an elastic material is attached to the cap 34 to be inserted into the short pipes 30 and 31, and includes a large diameter portion 10, a small diameter portion 11 and 12, and a truncated conical portion
3, 14 and the bulging portions 19, 19a have a leakage prevention structure using a sealant cover, characterized in that the thicknesses are uniform.