JPS60222688A - Sleeve for repairing pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a device for repairing damage to pipes installed in difficult-to-access locations, for example, buried underground. More particularly, the present invention relates to a repair sleeve that can be inserted into a pipe through an opening, such as an access groove, and that allows for the simple and effective formation of additional conduit components inside the damaged area of the pipe. The invention also includes a device for inserting such a sleeve.

0. Problems with conventional technology Cracks occur in wastewater pipes due to sediment,
Dicoints between pipes are often susceptible to leakage. This results in wastewater leaking and contaminating the surrounding land. Additionally, groundwater and rainwater can enter the pipes through damaged areas, increasing the amount of wastewater. This latter problem is
This is very important because uncontaminated water enters the pipes and is combined with the wastewater sent to the sewage treatment plant, increasing the amount of wastewater to be treated. As a result, the amount of wastewater exceeds the capacity of the treatment plant, and therefore insufficiently purified water is sent to the reservoir. Even if the plant does not run out of capacity, there is a cost involved in treating the unnecessarily large volumes of wastewater, including large volumes of water that do not need to be treated.

It is also common for roots of trees and other plants near the wastewater pipe to grow toward the point of the pipe leak.

This is due to the abundance of moisture and nutritional substances in such places. - Such root formations penetrate into cracks or holes in the pipe, where the cracks become larger as the roots grow thicker. Not only that, but the roots can also penetrate into pipes, obstructing, and in some cases completely blocking, the flow of wastewater there.

Although many solutions to the above problems have been considered, none of them can be said to be perfect.

Therefore, the usual method of pipe repair still involves some form of digging around the damaged area of the pipe, exposing the pipe at great expense and difficulty, and then replacing the damaged section of pipe. It is being carried out as if it were a repair.

Current technology typically uses remote-controlled °[
A V-shaped camera is used to determine the presence, size, and location of damage. There are also known devices for cutting and removing roots within pipes. All of these operations are carried out through the mouths of pipes in test wells, access trenches, etc.

You don't need to be an expert to understand that if you can repair AM from inside the pipe without digging, you can save a lot of money. Furthermore, any traffic disruption caused by excavation of streets and roads is avoided.

One attempt to solve the above-mentioned problems without performing large excavations is the so-called wall lining method. This method involves inserting an inner pipe into an existing pipe. This means that the cost is essentially as high as laying new pipe. However, there will be no need to re-dig streets and roads, except for areas where construction will begin in connection with inspection wells, etc. Wall lining methods are generally impractical for repairing discrete damage and are primarily used to prevent damage to older pipes. This is because inserting the inner tube requires special operations, such as digging a hole for insertion.

Means for Solving Problem C8 Accordingly, in the present invention, a sleeve in the form of a flexible hose with dimensions matching the dimensions of the pipe is inserted into the pipe, and this sleeve is firmly engaged with the inner wall of the pipe by means of a spring. It is meant to match. The invention also provides for the sleeve and spring to be threaded through the pipe to the damaged area, where the sleeve is pushed outward by a spring whose force is to prevent the sleeve from separating from the inside wall of the pipe primarily due to water pressure on the outside of the sleeve. Engage with the inner wall of the pipe.

Further, the elastic component of the sleeve does not include any element that protrudes into the pipe and opens the pipe to obstruct the flow.

The invention also provides a device for mounting and inserting a sleeve and spring into a pipe. The spring and sleeve are released from this device and pressed against the inner wall of the pipe. The insertion device is then easily removed from the pipe without disturbing the repaired area.

Self-sealing elements in the form of short hoses of flexible material which are pressed outwardly against the surrounding internal pipe wall by a spring are known. These elements are primarily used to seal pipe fittings and are designed to be installed during pipe installation.

These elements are also used as pipes for the transport of certain high-pressure gases or liquids, so the problems associated with wastewater or sewage systems, where the sleeve is forced into the pipe by external pressure, must not be considered. good.

The repair sleeve according to the invention is primarily intended for use in repairing underground wastewater pipes that are difficult to access, such as those that can only be accessed through narrow inspection wells or the like. Although such pipes may be cleaned to remove solids from the wastewater, they are still very dirty and
Furthermore, the atmosphere within the pipe is corrosive. According to one known embodiment of a sealing sleeve with a spring pressing the sleeve outwards, an adhesive material is provided on the outside of the sleeve, which securely fixes the sleeve to the surrounding pipe wall. This is because the sealing action of the spring is not completely reliable. However, in wastewater systems such adhesive methods are not technically possible.

According to another known embodiment, the spring element of the sleeve is biased by a turnbuckle. This construction also shows that effective sealing by spring force cannot be completely relied upon. In this case, one would have to crawl inside the pipe to reach such a turnbuckle. However, wastewater systems are rarely large enough to crawl through, and it is unclear whether anyone would be able to crawl through an environment such as a wastewater pipe.

As stated above, the present invention has been devised to repair wastewater pipes and to solve special problems associated with pipes in wastewater systems. This means that the repair sleeve of the present invention can be used in many applications with better conditions than wastewater systems. Compared to known devices of a similar type, the invention can be applied over long and short distances and can be installed in remote locations through pipe openings that are inaccessible except from a narrow inspection unit. .

The present invention thus solves the aforementioned problems and at the same time allows easy, cheap and quick repairs with virtually unlimited durability.

This object of the invention is achieved by a repair sleeve and an insertion device thereof according to the claims which characterize the invention.

Next, more specific embodiments of the present invention will be explained with reference to the attached notes.

2. Embodiment The repair sleeve according to the invention consists of a hose-like sleeve 1 enclosing a helical spring 2. In a preferred embodiment, the helical spring 2 is made of acid-resistant metal with a width of 2 to 5α and a thickness of 1 to 4 #I #I. Its dimensions will depend on the dimensions of the pipe in which the sleeve will be used. One of these methods is not critical to the present invention, and the cross-sectional shape of the helical spring element may also be arbitrary.

As can be seen in FIG. 1, where the spring 2 is shown in a completely untensioned (unstressed) state, the spring 2 has a maximum diameter in the middle and decreases in diameter towards the ends;
Therefore, the overall shape is barrel-shaped. Also, each turn of the spring is wound with a gap in the center, the gap decreases towards the ends, and is completely eliminated between the outermost turns. In this embodiment, the turns of the spring strip, viewed in cross section, are inclined with respect to the central axis of the spring 2. Holes 3 are provided near both free outer ends of the spring to receive retaining pins of the insertion device as described below.

An insertion device 4 is shown in FIGS. 3 and 4. The insertion device comprises a tubular main part 5 with wheels 6 that allow it to be moved along the interior of the pipe.

Holes for receiving pins 7 are provided at both ends of the tube wall of the tubular main part 5. A cage or eye 8 is provided above this mating hole, through which the end of the spring 2 placed on the main part 5 passes. The spring 2 is installed in such a way that the pin 7 passes through the hole 3 in the spring strip.

One end of the insertion device 4 is provided with an axially projecting closed bias tab 9 on which the hose 1 is inserted.
0 is attached. This hose 10 is preferably 60~
It is made of a material that will not rupture under gas or liquid pressures of the order of 70kp732 and has great flexibility when not pressurized.

The structure of the latching device, which is identical at both ends of the insertion device, is shown in FIGS. 5 and 6. The pin 7 is attached to one end of the arm 11 so that its axial position can be adjusted. For its adjustment, in the embodiment shown, one end of the bottle 7 is threaded and screwed into a threaded hole in the arm 11. The thread of the pin 7 is made long enough to be threaded with a lock knot 19. The other end of arm 11 is 12
It is pivoted at the point. “The helical spring 18 pushes against the arm 11 and biases the pin 7 outwards. The length of the pin 7 is such that its free end penetrates the wall of the part 5 and the thickness of the spring 2. Ru.

One end of a second arm 13 is suitably attached to arm 11 to transmit downward force. The other end of the arm 13 is pivotally connected to the pull rod 14 by a joint 20. The other end of the pull rod 14 is coupled to a lever 15 that is pivotable about a fulcrum pin 16. A second pull rod 14 is pivotally connected to the fulcrum pin 16 of the lever 15 at the same distance on each side, so that when the lever 15 is turned, two identical latching devices are actuated in the same way to lock both pins 7. Pull it out from hole 3 and release spring 2. The lever 15 is rotated by a pull rod □17 which is pivotally connected to it at one end. The other end of the pull rod 17 is provided with an eye.

Ho, operation The invention operates as follows.

After the end of the strip blank of the helical spring 2 has been inserted into the cage 8, the strip end is attached to the pin 7 by passing the pin 7 through the hole 3 in the strip end. A strip blank is then wrapped around the tubular main part 5.

This spring is so strong that special tools are required to wind it. When the best turn is reached, the other end of the spring 2 is inserted into the other cage 8,
The bottle 7 is then passed through the hole 3 there. In this position the spring is highly stressed and held in that position by the pin 7. In order to prevent an accident from occurring during the forming of the spring 2, a hood (not shown) may be provided to prevent the spring from bouncing back even if it slips.

The sleeve is then placed on the outside of the spring 2 and secured by the clip 21. At the same time, the clip 21 maintains the slots 11 folded over in the circumferential direction as shown in FIG. The insertion device is now ready as shown in FIGS. 3 and 4.

Although the insertion device 4, spring 2 and sleeve 1 are adapted to fit a given pipe diameter, the insertion device is applicable to a limited range of pipe diameters. In the untensioned state (unstressed state), the spring 2 has a diameter of about 10-20% larger at its ends than the pipe diameter, and a diameter of the central part is made even larger.

By conventional cleaning, as mentioned at the outset, the pipe is located for damage and prepared for repair by cleaning. After these operations are completed, the insertion device 4 is fed into the pipe from an inspection well or the like closest to the damaged area of the pipe. The arrangement of the wheels 6 as shown in FIGS. 113 and 4 holds the insertion device 4 in substantially the position shown in those figures. Compressed air is then sucked into the hose 1o. Since the pipe stub 9 is occluded, pressure builds up within the hose 10, making it stiff.

However, if force is applied, it can be bent laterally. That is, hose 1
0 can be bent even when pressurized, so the operator can straighten the hose little by little until it resembles a bar. This bar forces the insertion device along the inside of the pipe.

Once the insertion device 4 has been advanced to the required position relative to the lesion to be repaired, it is held there by a rigid bose 10. The cord tied to the eye of the rod 17 is then pulled, thereby retracting both bins 7 simultaneously and releasing the ends of the spring 2. Grip 21 is also pushed away.

Since the spring 2 is barrel-shaped as shown in Figure 2, when the spring is released, its central part first expands elastically, pushing the central part of the sleeve 1 against the inner wall of the same pipe. The pressing and outward expanding movement is carried out continuously in the axial direction towards the ends of the spring 2. The sleeve 1 is thus expanded both radially and axially, so that the risk of folding or creasing is virtually completely eliminated.

The spring 2 is somewhat longer than the sleeve 1 in its working state, so that the ends of the spring 2 protrude outside the sleeve 1 pressed against the pipe.

The outer turns of the spring 2 abut each other side by side, covering the ends of the sleeve 1 and preventing them from being drawn inward.

The cross section of the spring blank used can be arbitrary from circular to rectangular. However, the strip material as shown is advantageous in that it has fewer turns and a larger contact area. In contrast, conventional circular wire helical springs require a large number of turns and only provide a small contact area. A large contact area is important to withstand external pressure in fragile wastewater pipes. The turns are always kept relatively compact so that externally applied water pressure does not significantly dent the hose material in the gaps between the turns and impede flow.

As previously mentioned, the turns of the spring may be somewhat inclined relative to the central axis of the spring. Thus, when looking from the central portion of the spring 2 towards the ends, each turn of the spring slopes slightly inward. In the illustrated embodiment of the invention, the hose 1 has approximately 90
cm and has the same length i when the spring 2 is wound onto the insertion device 4. The length of this spring extends to 110 cm when the spring is released from the device 4. That is, when the spring 2 rebounds within the sleeve or hose 1 to an unstressed state, it expands radially and axially. By providing the above-mentioned slope, the turns of the spring, as they move outwardly from the central part of the hose towards the ends, simultaneously stretch the sleeve 1 into smooth engagement with the inner wall of the surrounding pipe. In order to make the movement of the spring within the sleeve 1 as smooth as possible, the inside of the sleeve is coated with a low-friction material. Alternatively, such material may be applied, sprayed or otherwise applied to the inside of the spring and/or sleeve before the sleeve is mounted over the spring on the insertion device 4.

To prevent new plant roots from growing into the damage repaired by the sleeve according to the invention, the outside of the sleeve 1 may be coated with copper sulphate or other substances that inhibit root growth. Further, depending on the special application, a sealing ring made of a special material may be provided around the sleeve 1. However, for normal wastewater pipe repairs, such a sealing ring is not necessary, since the spring 2 provides sufficient contact pressure between the sleeve 1 and the inner wall of the pipe to provide a proper seal.

The repair sleeve according to the invention can also be used in cases of relining, ie inserting some longer pipe section into a defective pipeline. It is not always easy to create a reliable seal between the existing pipe and the liner tube by simple means. Differences in diameter between two pipes are less of a problem with the repair sleeve of the present invention, and the tolerance for such differences in diameter and roundness is large, so it can be used effectively at the beginning and end of the liner. can do.

To prevent sleeve 1 from getting caught on spring 2,
A sleeve as shown in FIG. 7 can be made. For clarity of the drawing, the sleeve 1 is shown in "perspective" view, and it can be seen that there are two substantially circular springs 30, 31 of rectangular plane, one at each end of the inside of the sleeve 1. One by one
For example, it is installed by vulcanization. These circular springs 30
The circumference of the sleeve 1 is shorter than that of the sleeve 1, so that an unsupported portion 32 is formed between them, which causes the long edge of the sleeve 1 to take on the folded and overlapping shape shown in FIG. can become. The free ends of the springs 30, 31 are connected by a rigid longitudinal strip 33. This strip 33 serves to stretch the sleeve 1 in the longitudinal direction.

This sleeve 1 is used in the same manner as described above. However, the release sequence of the insertion device 4 in this case is such that the sleeve 1 of FIG. 7 is first released to expand against the inner pipe wall, and then the helical spring 2 is released to press the sleeve 1 firmly against the inner pipe wall It becomes like this. Its release and grasping movement of the sleeve 1 is the insertion device! This can be done easily and quickly by blowing compressed air into the sleeve from a jet (not shown) provided at 4.

A modified sleeve 40 is shown in FIG. This sleeve 40 is provided with air ducts 41, 42, 43. The sleeve 40 is shown in perspective view J so that these ducts are visible. In this embodiment, two longitudinal ducts 41
．． 42 extends axially at a small angle to the exact axis.

These ducts are provided with compressed air connections 44, 45 and from these ducts 41, 42 extend ducts 43 with a lip cage pattern.

The sleeve 40 is also conveyed to the damage site by the insertion device 4 in the same manner as described. The connections 44.45 are connected to valves on the device 4 and compressed air is fed into the ducts 41, 42.43 through the connections 44.45 once the sleeve 40 has been brought into position in the pipe. The compressed air force expands within these ducts and presses against the inner wall of the pipe. Once inserted, the spring 2 is released from both the axial and radial directions of the sleeve 40, pressing the sleeve 40 into a sealing state against the inner wall of the pipe. As soon as the spring 2 is released, the communication from the insertion device to the connection 44, 45 is suitably interrupted.

Still other embodiments of the sleeve spring and air duct of FIGS. 7 and 8 are possible, but they only tension the sleeve itself, and the spring 2 does not permanently tighten the sleeve. It will be understood that it is not meant to be fixed.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a spring for expanding the repair sleeve outward and a portion of the sleeve installed around the spring; Figure 2 is a reduced diameter sleeve for insertion into a vibrator. 3 is a schematic longitudinal sectional view of an insertion device according to the invention and a repair sleeve mounted on the device for insertion into a pipe; FIG. 4 is a left-hand end view of the device of FIG. Figures 5 and 6
7 is a schematic perspective view of a second embodiment of a repair sleeve; FIG. 8 is a schematic perspective view of a second embodiment of a repair sleeve; FIG. FIG. 7 is a schematic perspective view of a third embodiment. 1.40... Repair sleeve, 2... Spiral spring, 3.
...Bottle holder is a hole, 4...Insertion device, 5...Main parts, 6...Wheel, 7...Pin, 8...Cage, 1o
... Hose, 11.13, 14.15.17 ... Link device, 30.31 ... Spring, 41, 42.43.
...Air duct. Attorney: Akira Asamura Procedural amendment (voluntary) May 1, 1985 Mr. Commissioner of the Japan Patent Office1, Indication of the case, 1985 Patent Application No. 664052, Name of the invention: Sleeper for pipe repair3, Person making the amendment Relationship to the case Patent applicant address Name Sting Westman 4, agent 5, date of amendment order Showa year, month, day, engraving of specification (no change in content)

Claims (1)

[Claims] (1) Consisting of a flexible hose-like main part (1) and a spring (2) for expanding this main part, the pipe or pipeline to be repaired is The main part (1) of which the spring is placed together in a sleeve for insertion into a pipe to carry out repairs thereto;
It consists of a helical spring (2) that can be molded around a special insertion device that has a diameter that allows it to be inserted into a pipe or pipeline, so that the device, the spring and the main part can be easily repaired. to reach the damaged area of the pipe or pipeline, where the spring (2)
A repair sleeve, characterized in that the hose-like main part (1) is released and expands outwardly, pressing the hose-like main part (1) against the inner wall of the surrounding pipe or pipeline. (2) The repair sleeve according to claim 1, characterized in that the diameter of both ends of the spring (2) in an unstressed state is smaller than the diameter of the central part. (3) A repair sleeve according to claim 1 or 2, characterized in that the spring (2) is made by winding a metal strip. (4) The repair sleeve according to claim 3, wherein the turns of the strip are inclined inwardly from the central portion of the spring toward the central axis of the spring. . (5) In the repair sleeve according to claim 1, the substance that prevents root growth in the space between the hose-like main part (, 1) and the inner wall of the surrounding pipe is attached to the main part (, 1). 1) A repair sleeve characterized in that at least a portion of the outside of the item is coated. (6) A repair sleeve comprising a flexible hose-like main part (1) and a spring (2) that presses this main part into engagement against the inner wall of the surrounding pipe, inside the pipe or pipeline. A substantially tubular body portion (5 ) and wheels (6) for carrying the insertion device (4) in order to move it in a pipe or a ta pipeline.
) In the insertion device according to claim 6, the latching device comprises a pin (7) biased radially outwardly by a spring to align the wall of the tubular body with the end of the spring (2). , and an eye or cage (8) provided in combination with said pin and receiving said spring end. (8) In the insertion device according to claim 6 or 7, a high-pressure hose (10) is attached to one end of the insertion device (4), and this hose forms a hard rest when pressurized. An insertion device, characterized in that the insertion device can be propelled along a pipeline. (9) In the insertion device according to any one of claims 6 to 8, the pin (7) is operated by a link device (11, 13, 14, 15, 17). , and when the linkage is actuated both the pins (
7) is operated simultaneously. (10) A repair sleeve with a flexible hose-like main part (1, 40), in which a spring (2
Repair sleeve, characterized in that it is provided with a device for pretensioning its sleeve (1°40) before its expansion. (11) In the repair sleeve according to claim 10, the pretensioning device is constituted by a circular spring (30° 31) with a rectangular cross section that partially extends on the inner periphery of the sleeve (1). A repair sleeve characterized by: (12. The repair sleeve according to claim 10, characterized in that the pretensioning device is constituted by an air duct (41, 42° 43).