Non-excavation type repairing device and method for flexible pipeline

Abstract

The invention belongs to the technical field of municipal pipeline repair, and discloses a non-excavation type repair device and method for a flexible pipeline, the repair device comprises an inflation pipe, one end of the inflation pipe is plugged, and the other end of the inflation pipe is connected with a high-pressure air pump; the inflation tube penetrates through the air bag, and a ventilation hole is formed in the section in the air bag. Two ends of the air bag are fixedly connected with the inflation tube to form sealing; the air bag is sleeved with a supporting net, the supporting net is of a pipe body structure defined by net faces, and the net faces of the supporting net take rhombic grids as units; the repairing method comprises the steps that the repairing device is conveyed to a to-be-repaired site in the flexible pipeline; then high-pressure gas is inflated into the air bag through a high-pressure gas pump, the air bag expands to enable the supporting net to be unfolded, and the sunken flexible pipeline is repaired till the supporting net is fully attached to the pipe wall of the flexible pipeline; finally, the air bag is contracted through deflation, and the air bag is pulled out along with the inflation tube; the supporting net is reserved in the flexible pipeline and used for preventing secondary deformation of the flexible pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of municipal pipeline repair, and in particular relates to a trenchless repair device and a repair method for a flexible pipeline. Background Art

[0002] Flexible pipes are pipes that deform significantly under external loads, and most of the vertical loads are balanced by the elastic resistance generated by the soil on both sides of the pipe. Flexible pipes are widely used and closely related to people's lives. The flexible pipes listed in the specification mainly include steel pipes, chemical building material pipes and ductile iron pipes with flexible interfaces.

[0003] The failure or reduction of efficiency of flexible pipes is usually caused by deformation rather than damage to the pipe wall. At present, when flexible pipes are squeezed and deformed, they will cause a certain amount of flow loss and bring a series of economic losses. In addition, the cross-section of flexible pipes used in municipalities is generally small, and workers cannot enter the pipes, making it difficult to repair them. Even after the repair is completed, secondary squeezing and deformation are likely to occur due to the initial defects. Summary of the invention

[0004] The present invention aims to solve the technical problems of difficult repair and secondary extrusion deformation of flexible pipes, and provides a trenchless repair device and repair method for flexible pipes, which can effectively repair extruded and deformed flexible pipes and avoid secondary deformation of the repaired flexible pipes.

[0005] In order to achieve the above-mentioned object of the invention, the present invention is implemented by the following technical solutions:

[0006] According to one aspect of the present invention, a trenchless repair device for a flexible pipeline is provided, comprising an inflatable tube, one end of which is blocked and the other end is connected to a high-pressure air pump; the inflatable tube passes through an airbag, and both ends of the airbag are fixedly connected to the inflatable tube and form a seal; the inflatable tube is provided with a plurality of groups of vent holes at intervals along the axial direction of the section inside the airbag; the airbag is covered with a support net, the support net is a pipe body structure surrounded by a net surface, and the net surface is a diamond grid unit;

[0007] The support net is formed by a plurality of first strips and a plurality of second strips hinged to each other by rivets, the first strips and the second strips are both long strip structures, and both extend from one end of the support net to the other end; the first strips and the second strips are both provided with rivet holes arranged at equal intervals, the rivets pass through the rivet holes of the first strips and the second strips, so that the first strips and the second strips are cross-connected, and the first strips and the second strips can both rotate relative to the rivets; the first strips and the second strips overlap in the same manner on all the rivets, and the first strips and the second strips intersect at the rivet holes of the same position;

[0008] The rivet is evenly arranged with a plurality of through-length grooves along the circumferential direction, and each of the through-length grooves is set to penetrate along the axial direction of the rivet; correspondingly, the inner wall of each of the rivet holes of the first strip body and the second strip body is provided with a non-returning protrusion, and the non-returning protrusion is used to realize the unidirectional rotation and reverse locking of the first strip body and the second strip body relative to the rivet; all the non-returning protrusions of the first strip body are set in the same direction, and all the non-returning protrusions of the second strip body are set in the same direction, and at the same time, the directions of the non-returning protrusions of the first strip body and the second strip body are opposite;

[0009] When in use, high-pressure gas flows out from the high-pressure air pump and enters the inflation tube, and can enter the airbag through the vent hole. The airbag expands to unfold the contracted support net, thereby repairing the flexible pipe. During the unfolding of the support net, the first strip body and the second strip body rotate relative to each other. At this time, the anti-return protrusion does not limit the rotation of the first strip body and the second strip body relative to the rivet. When the support net is unfolded and subjected to external pressure, the anti-return protrusion is stuck in the through-length groove, which can prevent the first strip body and the second strip body from rotating in opposite directions respectively, thereby preventing the support net from retracting.

[0010] Furthermore, the plurality of groups of ventilation holes are arranged at equal intervals in the axial direction of the air-filled tube, and the plurality of ventilation holes in each group are evenly arranged in the circumferential direction of the air-filled tube.

[0011] Furthermore, the airbag withstands an internal pressure of no less than 10 MPa, and the air leakage does not exceed 1 L / min under an internal pressure of 10 MPa.

[0012] Furthermore, the airbag comprises a cylindrical body in the middle part when inflated, and the diameter of the cylindrical body is gradually reduced by cones at both ends so as to be fixedly connected with the inflation tube and form a seal.

[0013] Furthermore, the first strip body and the second strip body are made of a rigid material, with a thickness of 1 to 1.5 mm and a section modulus of 1.6 to 3.7 mm. 3 .

[0014] Furthermore, the distance between adjacent rivet holes on the first strip-shaped body and the second strip-shaped body is 3 to 5 cm.

[0015] Furthermore, the order of the rivet holes refers to: with the same end of the support mesh as the starting point, the arrangement sequence of the rivet holes in the first strip-shaped body and the second strip-shaped body.

[0016] Furthermore, the anti-return protrusion has a sliding portion and a blocking portion, and during the rotation of the first strip and the second strip relative to the rivet: if the sliding portion of the anti-return protrusion passes through the through-length groove relative to the blocking portion first, the first strip and the second strip can rotate smoothly relative to the rivet; if the blocking portion of the anti-return protrusion passes through the through-length groove relative to the sliding portion first, the first strip and the second strip cannot rotate relative to the rivet.

[0017] Furthermore, the same directions of the plurality of anti-return protrusions means that the sliding portion and the blocking portion are on the same side, and the opposite directions of the plurality of anti-return protrusions means that the sliding portion and the blocking portion are on different sides.

[0018] Furthermore, the sliding portion and the blocking portion of the anti-return protrusion are both planes, and the two planes extend from the inner wall of the rivet hole as the bottom until they intersect at the top, and the angle between the plane serving as the blocking portion and the inner wall of the rivet hole is greater than the angle between the plane serving as the sliding portion and the inner wall of the rivet hole, which is 70°-80°; the cross-section of the through-length groove in the radial direction of the rivet is a rectangle.

[0019] According to another aspect of the present invention, there is provided a trenchless repair method for a flexible pipeline, comprising:

[0020] S1: transporting the trenchless repair device to a location to be repaired in the flexible pipeline;

[0021] S2: using the high-pressure air pump to fill the airbag with high-pressure gas, the airbag expands to unfold the support net, so as to repair the sunken flexible pipe, until the support net is fully fitted with the pipe wall of the flexible pipe;

[0022] S3: Deflate the airbag through the inflation tube to shrink the airbag, and then pull the airbag out together with the inflation tube; the support net is retained inside the flexible pipe to prevent secondary deformation of the flexible pipe.

[0023] The beneficial effects of the present invention are:

[0024] On the one hand, the present invention allows high-pressure gas to enter the airbag through the inflation tube, so that the airbag expands and drives the support net to unfold, and then the support net can repair the flexible pipe that has been squeezed and deformed. The operation is simple, the process is less, the requirements for operators are low, and the construction is safe and fast with high safety. On the other hand, the present invention deflates the airbag so that the airbag moves out of the pipeline together with the inflation tube, and the support net does not shrink after unfolding due to its special design, so it remains inside the flexible pipe to prevent it from secondary deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the trenchless repair device of the present invention in an unfolded state;

[0026] Figure 2 It is a schematic diagram of the non-excavation repair device of the present invention in a retracted state;

[0027] Figure 3 is a cross-sectional view of an air bag in a trenchless repair device of the present invention;

[0028] Figure 4 It is a schematic plan view of the connection between the first strip body and the second strip body in the trenchless repair device of the present invention;

[0029] Figure 5 It is a schematic elevation diagram of the connection between the first strip body and the second strip body in the trenchless repair device of the present invention;

[0030] Figure 6 It is a schematic diagram of the matching relationship between the stop reverse protrusion and the through-length groove of the trenchless repair device of the present invention;

[0031] Figure 7 is a cross-sectional view of a rivet in the trenchless repair device of the present invention;

[0032] Figure 8 It is a schematic diagram of the distribution of rivet holes on the first strip body / the second strip body in the trenchless repair device of the present invention.

[0033] In the above figure: 1. inflation tube; 2. airbag; 3. support net; 4. sealing tape; 5. high-pressure air pump; 6. vent; 7. first strip; 8. second strip; 9. rivet; 10. through-length groove; 11. rivet hole; 12. anti-return protrusion; 13. sliding part; 14. blocking part. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below through specific examples. The following examples can enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way.

[0035] like Figures 1 to 3 As shown, an embodiment of the present invention provides a trenchless repair device for a flexible pipeline, which mainly includes an inflatable tube 1, an air bag 2 and a support net 3.

[0036] The inflation tube 1 passes through the airbag 2, and both ends of the airbag 2 are fixed to the inflation tube 1 by sealing tape 4 to form a seal. The sealing tape 4 can be a commercial sealing tape such as butyl tape that can withstand high-pressure gas. One end of the inflation tube 1 is blocked, and the other end is connected to the high-pressure air pump 5. The inflation tube 1 is provided with multiple groups of vent holes 6 at intervals along its axial direction in the section passing through the airbag 2, and the multiple groups of vent holes 6 are preferably arranged at equal intervals; each group of vent holes 6 is provided with multiple vent holes 6 in the circumferential direction of the inflation tube 1, and the multiple vent holes 6 in each group are preferably evenly arranged in the circumferential direction.

[0037] The airbag 2 is made of a soft material, such as a polymer plastic film. Generally, the airbag 2 should withstand an internal pressure of no less than 10MPa, and the air leakage should not exceed 1L / min under an internal pressure of 10MPa. The main shape of the airbag 2 in its inflated state is generally a cylinder, and the diameter of the cylinder is gradually reduced by cones at both ends to ensure a sealed connection with the inflation tube 1. Preferably, the length of the airbag 2 after inflation is 2 to 3 times its diameter, and the airbag 2 can be set to a selected specification with a gradient of 100mm, which ensures that the airbag 2 has fewer specifications and room for "overfilling" of the airbag 2, ensuring a tight fit. The selection of the diameter of the airbag 2 should ensure that the diameter of the airbag 2 is larger than the diameter of the flexible pipe to be repaired, but the larger amount does not exceed 100mm, so as to ensure that the airbag 2 fits better with the support net 3 and the flexible pipe after inflation.

[0038] The support net 3 is a tubular structure surrounded by a mesh surface, and the mesh surface is composed of diamond grids as units. The contraction and stretching of the support net 3 are achieved through the changes in the diamond grids. The support net 3 is sleeved on the outside of the airbag 2, and can significantly increase its diameter while the length of the airbag 2 is slightly shortened after inflation. High-pressure gas flows out of the high-pressure air pump 5 into the inflation tube 1, and enters the airbag 2 through the vent 6. The airbag 2 expands to expand the contracted support net 3, and the flexible pipeline is repaired.

[0039] like Figure 4 and Figure 5 As shown, the support net 3 is formed by a plurality of first strips 7 and a plurality of second strips 8 hinged to each other by rivets 9. The first strips 7 and the second strips 8 are of the same shape, size and quantity, and are both long strip structures, and their cross-sectional shapes are generally rectangular, and their lengths are preferably the same as the main shape specifications of the airbag 2, and the thickness is preferably within the range of 1 to 1.5 mm, and the section modulus is preferably 1.6 to 3.7 mm 3The size can ensure that the support net 3 fits better with the flexible pipe. The first strip body 7 and the second strip body 8 are made of the same material, both of which are made of rigid materials, such as austenitic stainless steel; they have high strength, moderate rigidity, corrosion resistance, high temperature resistance, good durability, and can adapt to various liquid media in the pipeline during service.

[0040] The first strip body 7 and the second strip body 8 are all extended from one end of the support net 3 to the other end; all the first strip bodies 7 are tilted in the same direction, and all the second strip bodies 8 are tilted in the same direction. The first strip body 7 and the second strip body 8 are both provided with rivet holes 11 arranged at equal intervals, and the rivet 9 passes through the rivet holes 11 of the first strip body 7 and the second strip body 8, so that the first strip body 7 and the second strip body 8 are cross-connected, and the first strip body 7 and the second strip body 8 can rotate relative to the rivet 9. As a preferred embodiment, the spacing between adjacent rivet holes 11 on the first strip body 7 or the second strip body 8 is 3 to 5 cm.

[0041] The overlapping manner of the first strip body 7 and the second strip body 8 on all rivets 9 is consistent, that is, the first strip body 7 is overlapped on the second strip body 8, or the second strip body 8 is overlapped on the first strip body 7. In addition, the first strip body 7 and the second strip body 8 intersect at the rivet holes 11 of the same position. The position of the rivet hole 11 refers to: the arrangement sequence of the rivet hole 11 in the first strip body 7 and the second strip body 8 starting from the same end of the support net 3. For example: if a certain first strip body 7 and a certain first strip body 7 intersect a certain rivet hole 11, if the rivet hole 11 is located at the second position of the first strip body 7, it is also located at the second position of the second strip body 8.

[0042] like Figure 6 and Figure 7 As shown, the rivet 9 is evenly arranged with a plurality of through-length grooves 10 along the circumference, and each through-length groove 10 is set through the rivet 9 along the axial direction. As a preferred embodiment, the cross-section of the through-length groove 10 in the radial direction of the rivet 9 is rectangular, that is, both side surfaces of the through-length groove 10 are at right angles to the bottom surface. Correspondingly, the inner wall of each rivet hole 11 of the first strip 7 and the second strip 8 is provided with a non-returning protrusion 12, which is used to realize the unidirectional rotation and reverse locking of the first strip 7 and the second strip 8 relative to the rivet 9. During the unfolding process of the support net 3, the diamond grid of the support net 3 changes, and the first strip body 7 and the second strip body 8 rotate relative to each other. At this time, the anti-return protrusion 12 does not restrict the rotation of the first strip body 7 and the second strip body 8 relative to the rivet 9. When the support net 3 is unfolded and subjected to external pressure, the anti-return protrusion 12 is stuck in the through-length groove 10, which can prevent the first strip body 7 and the second strip body 8 from rotating in opposite directions respectively, and the diamond grid shape of the support net 3 no longer changes, thereby preventing the support net 3 from retracting.

[0043] The anti-return protrusion 12 has a sliding portion 13 and a blocking portion 14. During the rotation of the first strip 7 and the second strip 8 relative to the rivet 9: if the sliding portion 13 of the anti-return protrusion 12 passes through the various through-length grooves 10 of the rivet 9 relative to the blocking portion 14 first, the first strip 7 and the second strip 8 can rotate smoothly relative to the rivet 9, and the anti-return protrusion 12 does not work at this time; if the blocking portion 14 of the anti-return protrusion 12 passes through the various through-length grooves 10 of the rivet 9 relative to the sliding portion 13 first, the first strip 7 and the second strip 8 cannot rotate relative to the rivet 9, and the anti-return protrusion 12 plays a anti-return role at this time.

[0044] like Figure 8 As shown, the anti-return protrusions 12 of all rivet holes 11 on the first strip 7 are arranged in the same direction, and the anti-return protrusions 12 of all rivet holes 11 on the second strip 8 are arranged in the same direction, and the anti-return protrusions 12 of the first strip 7 and the second strip 8 are arranged in opposite directions. The same direction of the multiple anti-return protrusions 12 means that the sliding portion 13 and the blocking portion 14 are on the same side, and the rivet holes 11 can rotate in the same direction relative to the rivet 9 when the directions of the anti-return protrusions 12 are the same; the opposite directions of the multiple anti-return protrusions 12 means that the sliding portion 13 and the blocking portion 14 are on different sides, and the rivet holes 11 can rotate in opposite directions relative to the rivet 9 when the directions of the anti-return protrusions 12 are opposite.

[0045] As a feasible implementation, the sliding portion 13 and the blocking portion 14 of the anti-return protrusion 12 are both planes, and the two planes extend from the inner wall of the rivet hole 11 as the bottom until they intersect at the top, and the angle between the plane as the blocking portion 14 and the inner wall of the rivet hole 11 is greater than the angle between the plane as the sliding portion 13 and the inner wall of the rivet hole 11, which is 70°-80°. Preferably, the angle between the blocking portion 14 and the inner wall of the rivet hole 11 can be a right angle or close to a right angle. In this way, during the unfolding process of the support net 3, the anti-return protrusion 12 rotates around the rivet 9 with its side as the sliding portion 13. Since the angle between the side as the sliding portion 13 and the inner wall of the rivet hole 11 is small, the anti-return protrusion 12 can smoothly slide through the through-length groove 10, so that the first strip body 7 and the second strip body 8 are easy to rotate relative to the rivet 9. When the flexible pipe is about to undergo secondary deformation under external load, the anti-return protrusion 12 tends to rotate in the direction of the blocking portion 14. However, due to the large angle between the side surface of the blocking portion 14 and the inner wall of the rivet hole 11, the through-length groove 10 can block the anti-return protrusion 12, making it impossible for the first strip body 7 and the second strip body 8 to rotate relative to the rivet 9, thereby preventing the support net 3 from retracting after being unfolded, thereby preventing the pipe from undergoing secondary deformation.

[0046] Based on the above-mentioned trenchless repair device for a flexible pipe, an embodiment of the present invention further provides a trenchless repair method for a flexible pipe, comprising the following steps:

[0047] S1: According to the location to be repaired, the trenchless repair device is transported as a whole to the location to be repaired in the flexible pipeline.

[0048] S2: After being delivered to the repair site, the airbag 2 is filled with high-pressure gas using an external high-pressure air pump 5 to expand the support net 3 to repair the sunken flexible pipe until the support net 3 is fully fitted with the pipe wall of the flexible pipe.

[0049] S3: After the flexible pipe is repaired and fully fitted with its pipe wall, due to the interaction between the reverse protrusion 12 of the first strip body 7 and the second strip body 8 and the through-length groove 10 of the rivet 9, the support net 3 is fixed inside the flexible pipe, which can prevent the flexible pipe from secondary deformation to a certain extent. Subsequently, the airbag 2 is deflated through the inflation tube 1 to shrink the airbag 2, and then the airbag 2 is pulled out together with the inflation tube 1.

[0050] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A trenchless repair device for a flexible pipe, characterized in that: The air bag comprises an inflatable tube, one end of which is blocked and the other end is connected to a high-pressure air pump; the inflatable tube passes through the air bag, and both ends of the air bag are fixedly connected to the inflatable tube and form a seal; the inflatable tube is provided with a plurality of groups of vent holes at intervals along the axial direction of the section inside the air bag; the air bag is covered with a support net outside, and the support net is a tube structure surrounded by a net surface, and the net surface is a diamond grid unit; The support net is formed by a plurality of first strips and a plurality of second strips hinged to each other by rivets, the first strips and the second strips are both long strip structures, and both extend from one end of the support net to the other end; the first strips and the second strips are both provided with rivet holes arranged at equal intervals, the rivets pass through the rivet holes of the first strips and the second strips, so that the first strips and the second strips are cross-connected, and the first strips and the second strips can both rotate relative to the rivets; the first strips and the second strips overlap in the same manner on all the rivets, and the first strips and the second strips intersect at the rivet holes of the same position; The rivet is evenly arranged with a plurality of through-length grooves along the circumferential direction, and each of the through-length grooves is set to penetrate along the axial direction of the rivet; correspondingly, the inner wall of each of the rivet holes of the first strip body and the second strip body is provided with a non-returning protrusion, and the non-returning protrusion is used to realize the unidirectional rotation and reverse locking of the first strip body and the second strip body relative to the rivet; all the non-returning protrusions of the first strip body are set in the same direction, and all the non-returning protrusions of the second strip body are set in the same direction, and at the same time, the directions of the non-returning protrusions of the first strip body and the second strip body are opposite; When in use, high-pressure gas flows out from the high-pressure air pump and enters the inflation tube, and can enter the airbag through the vent hole. The airbag expands to unfold the contracted support net, thereby repairing the flexible pipe. During the unfolding of the support net, the first strip body and the second strip body rotate relative to each other. At this time, the anti-return protrusion does not limit the rotation of the first strip body and the second strip body relative to the rivet. When the support net is unfolded and subjected to external pressure, the anti-return protrusion is stuck in the through-length groove, which can prevent the first strip body and the second strip body from rotating in opposite directions respectively, thereby preventing the support net from retracting.

2. A trenchless repair device for a flexible pipe according to claim 1, characterized in that: A plurality of groups of ventilation holes are arranged at equal intervals in the axial direction of the inflation tube, and a plurality of ventilation holes in each group are evenly arranged in the circumferential direction of the inflation tube.

3. A trenchless repair device for a flexible pipe according to claim 1, characterized in that: The airbag withstands an internal pressure of no less than 10 MPa, and the air leakage does not exceed 1 L / min under an internal pressure of 10 MPa.

4. A trenchless repair device for a flexible pipe according to claim 1, characterized in that: The airbag comprises a cylindrical body in the middle part when inflated, and the diameter of the cylindrical body is gradually reduced by cones at both ends so as to be fixedly connected with the inflation tube and form a seal.

5. The trenchless repair device for a flexible pipe according to claim 1, characterized in that: The first strip body and the second strip body are made of rigid material, with a thickness of 1 to 1.5 mm and a section modulus of 1.6 to 3.7 mm. 3 .

6. A trenchless repair device for a flexible pipe according to claim 1, characterized in that: The spacing between adjacent rivet holes on the first strip and the second strip is 3-5 cm; the position of the rivet holes refers to: starting from the same end of the support mesh, the arrangement sequence of the rivet holes on the first strip and the second strip.

7. A trenchless repair device for a flexible pipe according to claim 1, characterized in that: The anti-return protrusion has a sliding portion and a blocking portion. During the rotation of the first strip and the second strip relative to the rivet: if the sliding portion of the anti-return protrusion passes through the through-length groove relative to the blocking portion first, the first strip and the second strip can rotate smoothly relative to the rivet; if the blocking portion of the anti-return protrusion passes through the through-length groove relative to the sliding portion first, the first strip and the second strip cannot rotate relative to the rivet.

8. A trenchless repair device for a flexible pipe according to claim 7, characterized in that: The same directions of the plurality of anti-return protrusions means that the sliding portion and the blocking portion are on the same side, and the opposite directions of the plurality of anti-return protrusions means that the sliding portion and the blocking portion are on different sides.

9. A trenchless repair device for a flexible pipe according to claim 7, characterized in that: The sliding part and the blocking part of the anti-return protrusion are both planes, and the two planes extend from the inner wall of the rivet hole as the bottom until they intersect at the top. The angle between the plane serving as the blocking part and the inner wall of the rivet hole is greater than the angle between the plane serving as the sliding part and the inner wall of the rivet hole, which is 70°-80°; the cross-section of the through-length groove in the radial direction of the rivet is a rectangle.

10. A trenchless repair method for a flexible pipe based on the trenchless repair device for a flexible pipe according to any one of claims 1 to 9, characterized in that: include: S1: transporting the trenchless repair device to a location to be repaired in the flexible pipeline; S2: using the high-pressure air pump to fill the airbag with high-pressure gas, the airbag expands to unfold the support net, so as to repair the sunken flexible pipe, until the support net is fully fitted with the pipe wall of the flexible pipe; S3: Deflate the airbag through the inflation tube to shrink the airbag, and then pull the airbag out together with the inflation tube; the support net is retained inside the flexible pipe to prevent secondary deformation of the flexible pipe.

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