A trenchless pipe rehabilitation apparatus for a multi-layer composite flexible main

Abstract

The application provides a trenchless pipeline repair device of a multilayer composite flexible main pipe, when the trenchless pipeline repair device of the multilayer composite flexible main pipe is deformed in the construction or use process, the spiral wire is elastically deformed along the spiral direction, which can absorb external impact load, and can drive the flexible layer and the wear-resistant layer to restore to the original shape after the deformation is removed, so that the long-term stable use of the pipeline is ensured. The trenchless pipeline repair device of the multilayer composite flexible main pipe comprises a flexible layer, a spiral wire and a wear-resistant layer, wherein the flexible layer is a basic bearing and sealing structure, the spiral wire is arranged in the flexible layer and is used for improving the overall compression resistance and deformation resistance, and the wear-resistant layer is wrapped on the outer surface of the flexible layer and is used for improving the wear resistance and erosion resistance of the outer surface of the main pipe.

Description

Technical Field

[0001] This application relates to the field of flexible pipeline technology, and in particular to a trenchless pipeline repair device for a multi-layer composite flexible main pipe. Background Technology

[0002] Flexible pipes are widely used in various fields, such as fire protection systems, ore drilling, and sewer laying, by laying flexible pipes to the required application scenarios.

[0003] However, during use, flexible pipes often experience wear and tear due to various reasons, such as long-term water erosion, friction from sharp objects in the soil, and chemical corrosion from the media inside the pipe. This wear gradually weakens the pipe's strength and sealing, eventually leading to problems like pipe rupture and leakage. Traditional flexible pipes are manufactured using a single-layer material. This single-layer structure offers very weak protection against complex and changing abrasive environments, making it difficult to effectively resist the combined effects of multiple abrasive factors, resulting in a short service life.

[0004] Another type of flexible pipe made of composite materials uses a cross-laid steel wire structure, making the flexible material appear as a mesh. However, when passing through some narrow spaces, it is difficult to deform and shrink its structure to pass through, which greatly limits its application range. Moreover, when this type of flexible pipe is subjected to excessive local wear, the steel wire mesh structure is prone to breakage, which in turn affects the strength and sealing performance of the entire pipeline. Utility Model Content

[0005] Therefore, it is necessary to propose a trenchless pipeline repair device for multi-layer composite flexible main pipes to address the aforementioned technical problems.

[0006] This application provides a trenchless pipeline repair device for multi-layer composite flexible main pipes, the trenchless pipeline repair device for multi-layer composite flexible main pipes includes:

[0007] The flexible layer has a hollow channel in the middle;

[0008] Spiral wires are disposed within the flexible layer and spirally arranged along the length of the flexible layer;

[0009] A wear-resistant layer is wrapped around the outer surface of the flexible layer;

[0010] When the trenchless pipeline repair device of the multi-layer composite flexible main pipe deforms, the spiral wire deforms along its spiral direction.

[0011] In at least one embodiment of this application, the spiral wire includes multiple sets, and the multiple sets of spiral wires are arranged at equal angles inside the flexible layer with the axis of the flexible layer as the axis.

[0012] In at least one embodiment of this application, the thickness of the wear-resistant layer is 1mm-1.5mm.

[0013] In at least one embodiment of this application, the trenchless pipeline repair device for the multilayer composite flexible main pipe further includes:

[0014] A deformation component is disposed within the hollow channel, the deformation component being used to support the flexible layer in a radially expanded state, or to release the flexible layer in a contracted state.

[0015] In at least one embodiment of this application, the deformation component includes:

[0016] A semicircular plate is disposed on the inner wall of the hollow channel, and the axis of the semicircular plate is collinear with the axis of the hollow channel;

[0017] An arc-shaped plate, one end of which is rotatably connected to the semi-circular plate;

[0018] The locking plate has one end rotatably connected to the arc-shaped plate, and the other end is housed in the semi-circular plate and can lock with the semi-circular plate.

[0019] The locking plate engages with the semi-circular plate to fix the arc-shaped plate, so that the arc-shaped plate and the semi-circular plate fit against the inner wall of the hollow channel; the locking plate disengages from the semi-circular plate to release the arc-shaped plate, so that the trenchless pipeline repair device of the multi-layer composite flexible main pipe can deform radially.

[0020] In at least one embodiment of this application, the maximum distance from the locking plate to the axis of the hollow channel is denoted as a, the maximum distance from the semicircular plate to the axis of the hollow channel is denoted as b, and the maximum distance from the arc-shaped plate to the axis of the hollow channel is denoted as c, satisfying the relationship: a < b = c.

[0021] In at least one embodiment of this application, the semicircular plate is provided with an arc-shaped groove, one end of the locking plate is received in the groove, the inner wall of the semicircular plate is provided with a locking position, and the locking plate is provided with a first locking block, which can engage with the locking position to fix the arc-shaped plate so that the arc-shaped plate and the semicircular plate together form an annular plate.

[0022] In at least one embodiment of this application, the deformation component further includes:

[0023] The first rotating column is rotatably connected to the arc-shaped plate at one end and located at one end of the semi-circular plate at the other end;

[0024] The second rotating column is rotatably connected at one end to the locking plate, and at the other end of the arc-shaped plate away from the semi-circular plate.

[0025] In at least one embodiment of this application, the locking plate is provided with a second locking block, the first locking block is located between the second rotating post and the second locking block, and the second locking block is located at the end of the locking plate away from the second rotating post.

[0026] In at least one embodiment of this application, a spring sheet is provided on the semicircular plate, and the spring sheet is located in the groove;

[0027] When the first locking block disengages from the locking position, and the second locking block engages with the locking position and continues to expand the annular plate, the second locking block abuts against the spring piece, causing the spring piece to generate elastic force, which is then applied to the second locking block, ultimately causing the locking plate to disengage from the locking position.

[0028] The trenchless pipe repair device for multi-layer composite flexible main pipes implemented in this embodiment will have at least the following beneficial effects:

[0029] The trenchless pipeline repair device for the multi-layer composite flexible main pipe provided above can cause elastic deformation of the spiral wires along its spiral direction when the device deforms during construction or use. This can absorb external impact loads and also restore the flexible layer and wear-resistant layer to near their original shape after the deformation is released, thereby ensuring the long-term stable use of the pipeline.

[0030] The trenchless pipeline repair device for the multi-layer composite flexible main pipe includes a flexible layer, a spiral wire, and a wear-resistant layer. The flexible layer is the basic load-bearing and sealing structure. The spiral wire is set inside the flexible layer to improve the overall pressure resistance and deformation resistance. The wear-resistant layer covers the outer surface of the flexible layer to improve the wear resistance and erosion resistance of the main pipe's outer surface. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] in:

[0033] Figure 1 A perspective view of a trenchless pipe repair device for a multi-layer composite flexible main pipe in one embodiment;

[0034] Figure 2 An exploded view of a trenchless pipe repair device for a multilayer composite flexible main pipe in one embodiment;

[0035] Figure 3 This is a cross-sectional view of a trenchless pipe repair device for a multi-layer composite flexible main pipe in one embodiment;

[0036] Figure 4 for Figure 3 Enlarged view of section A.

[0037] Explanation of reference numerals in the attached diagram:

[0038] 100. Trenchless pipeline repair device for multi-layer composite flexible main pipe; 10. Flexible layer; 11. Hollow channel; 20. Spiral wire; 30. Wear-resistant layer; 40. Deformation component; 41. Semi-circular plate; 411. Arc-shaped chute; 412. Locking position; 413. Spring piece; 42. Arc-shaped plate; 43. Locking plate; 431. First locking block; 432. Second locking block; 44. First rotating column; 45. Second rotating column. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] This application provides a trenchless pipeline repair device 100 for multi-layer composite flexible main pipes, the trenchless pipeline repair device 100 for multi-layer composite flexible main pipes includes:

[0041] The flexible layer 10 has a hollow channel 11 formed in the middle.

[0042] Spiral wire 20 is disposed within the flexible layer 10 and spirally arranged along the length direction of the flexible layer 10.

[0043] A wear-resistant layer 30 is wrapped around the outer surface of the flexible layer 10.

[0044] When the trenchless pipeline repair device 100 of the multi-layer composite flexible main pipe deforms, the spiral wire 20 deforms along its spiral direction.

[0045] The multi-layer composite flexible main trenchless pipe repair device 100 is mainly used in trenchless repair scenarios for municipal drainage pipes, tap water pipes, industrial transmission pipes, etc. By laying this device inside the original old pipe, a new inner lining pipe is formed to restore or improve the strength and sealing performance of the original pipe.

[0046] Please refer to Figures 1-2Specifically, the trenchless pipeline repair device 100 of the multi-layer composite flexible main pipe includes a flexible layer 10, a spiral wire 20, and a wear-resistant layer 30. The flexible layer 10 is the basic load-bearing and sealing structure. The spiral wire 20 is set inside the flexible layer 10 to improve the overall pressure resistance and deformation resistance. The wear-resistant layer 30 covers the outer surface of the flexible layer 10 to improve the wear resistance and erosion resistance of the outer surface of the main pipe.

[0047] When the spiral wire 20 deforms along its spiral direction, it is essentially a process of axial extension and slight radial expansion and contraction of the spiral spring. This deformation has recoverability and good elasticity, which allows the main pipeline to adapt to external constraints and undergo elastic deformation when passing through narrow spaces or bends, solving the problem that the steel wire cross mesh structure is difficult to bend under local constraints.

[0048] A break in a cross-wire mesh can easily lead to stress concentration and a significant decrease in overall strength. However, the spiral wire 20 is continuously installed along the length of the pipe. Even if a small section of the spiral wire 20 is worn thinned or damaged, the other spiral rings and the flexible layer 10 and wear-resistant layer 30 in the circumferential range will still share the stress, so the overall structural strength will not be immediately weakened, thus significantly improving safety.

[0049] The spiral wire 20 is equivalent to embedding a series of "spring skeletons" inside the flexible pipe wall, which can improve the pipe's resistance to internal and external pressure while ensuring overall flexibility.

[0050] When the trenchless pipeline repair device 100 of the multi-layer composite flexible main pipe deforms during construction or use, the spiral wire 20 undergoes elastic deformation along its spiral direction. This can absorb external impact loads and, after the deformation is released, drive the flexible layer 10 and the wear-resistant layer 30 to return to their original shape, thereby ensuring the long-term stable use of the pipeline.

[0051] The flexible layer 10 extends along the length of the main pipeline, and a hollow channel 11 is formed in the middle that runs through the entire length of the pipeline. It is used to allow the medium to flow during construction and use, or to accommodate the mechanism for support and tensioning. It can also allow the traction rope, testing equipment and grouting medium to pass through during the repair construction stage.

[0052] The flexible layer 10 is preferably made of a polymer material with good flexibility and high corrosion resistance, such as polyurethane, polyethylene, rubber, or composite material.

[0053] The flexible layer 10 itself provides basic sealing performance. When the main pipeline expands and fits against the inner wall of the circular pipe, the flexible layer 10 fits tightly to prevent media leakage.

[0054] The hollow channel 11 can be formed by: first extruding to form a hollow hose, and then embedding a spiral wire 20 during or after extrusion; or by using a mold forming method to form a flexible layer 10 with a hollow channel 11 in one step.

[0055] The spiral wire 20 is arranged in the flexible layer 10 as follows: with the axis of the flexible layer 10 as the reference, the spiral wire 20 is continuously wound in a spiral shape along the axial direction. The pitch of the spiral wire 20 can be selected according to the pipe diameter and the design pressure rating.

[0056] In at least one embodiment of this application, the spiral wire 20 includes multiple sets, and the multiple sets of spiral wires 20 are arranged at equal angles inside the flexible layer 10 with the axis of the flexible layer 10 as the axis.

[0057] Please refer to Figures 1-4 Specifically, the circumferential section of the flexible layer 10 can be divided into several equal angular intervals with the axis of the flexible layer 10 as the center. For example, it can be divided into three, four, or six equal intervals. A set of spiral wires 20 can be set at the position corresponding to each equal angle, so that each set of spiral wires 20 is evenly distributed in the circumferential direction.

[0058] Each set of spiral wires 20 extends spirally along the length of the flexible layer 10, forming multiple spiral reinforcing ribs distributed along the pipe axis, thus forming a multi-point circumferential support structure within the flexible layer 10.

[0059] Multiple sets of spiral wires 20 are evenly embedded inside the flexible layer 10. While maintaining the overall flexibility of the flexible layer 10, they participate in bearing the load from multiple circumferential positions. When the pipeline bends, twists, or passes through narrow spaces such as wellheads and bends, they can still undergo controllable spiral elastic deformation together with the flexible layer 10, avoiding the situation where the rigid skeleton is difficult to deform and pass through.

[0060] The structure with multiple sets of spiral wires arranged at equal angles makes the circumferential stiffness more uniform. External earth pressure, overlying load or internal medium pressure no longer acts in a single direction, which significantly reduces the risk of local buckling, elliptic deformation and local bulging.

[0061] Since the spiral wires 20 do not cross each other and are evenly distributed in the circumferential direction, even if a certain group of spiral wires 20 is worn or damaged in a certain local area, the other groups of spiral wires 20 can still provide effective support. Unlike cross wire mesh, which may fail due to local breakage, this structure has improved safety redundancy and significantly extended the service life of the repaired pipeline.

[0062] In at least one embodiment of this application, the thickness of the wear-resistant layer 30 is 1mm-1.5mm.

[0063] Please refer to Figures 1-4Specifically, when the wear-resistant layer 30 is less than about 1 mm thick, although it has good flexibility, it is easily worn through under long-term scouring and friction conditions, making it difficult to effectively protect the inner flexible layer 10 and the spiral wire 20.

[0064] When the wear-resistant layer thickness is too large, although the wear resistance is improved, the bending radius of the overall pipe body increases significantly and the flexibility decreases significantly. When passing through narrow spaces and sharp bends, problems such as "hardening" and "not fitting" will occur, which is not conducive to trenchless traction construction.

[0065] The thickness of the wear-resistant layer 30 is limited to the range of 1mm to 1.5mm to ensure sufficient material thickness to resist mechanical wear and chemical corrosion. On the other hand, it ensures that the pipe body as a whole still maintains good flexibility and bendability, so as not to affect the pipe's ability to deform and pass through complex paths due to excessive outer layer thickness.

[0066] Within this thickness range, the wear-resistant layer 30 can significantly delay the thinning and perforation of the outer wall caused by water flow erosion, particle abrasion and friction from sharp objects in the soil, greatly improving the wear resistance and overall service life of the pipeline.

[0067] Within this thickness range, the pipeline still has a small minimum bending radius and good conformability when being pulled and laid for trenchless repair. It can smoothly pass through the diameter change section, interface steps and bends in the old pipe, avoiding the problem of excessive rigidity and difficulty in deforming through narrow positions, similar to the cross wire mesh structure.

[0068] In at least one embodiment of this application, the trenchless pipeline repair device 100 for the multilayer composite flexible main pipe further includes:

[0069] Deformation component 40 is disposed within the hollow channel 11. The deformation component 40 is used to support the flexible layer 10 in a radially expanded state or to release the flexible layer 10 in a contracted state.

[0070] Please refer to Figures 1-4 Specifically, the deformation component 40, in a radially expanded state, pushes the flexible layer 10 outward, causing the flexible layer 10, together with the internal spiral wire 20 and the outer wear-resistant layer 30, to open outward as a whole, fitting against the inner wall of the original pipe or a pre-set liner layer, thereby forming a stable composite liner structure.

[0071] When it contracts, it closes itself up, so that no obvious radial support force is formed in the hollow channel 11, thereby releasing the flexible layer 10. This allows the flexible layer 10 to fully contract, bend, or fold when being pulled, passing through narrow or complex sections such as wellheads, bends, and reduced diameter sections, reducing its outer diameter and stiffness, and facilitating construction operations.

[0072] By setting a controllable deformation component 40 in the hollow channel 11, the expansion and contraction process has clear mechanical or institutional control. It can choose to maintain the contracted state to facilitate passage or switch to the expansion state to achieve reliable support according to different needs of the construction stage.

[0073] During the construction traction phase, the deformation component 40 can be in a contracted state. Combined with the high flexibility of the flexible layer 10 itself and the elastic deformation capability of the internal spiral wire 20, the resistance of the pipeline when passing through the manhole opening, misalignment and bend is significantly reduced, expanding the applicable scenarios.

[0074] In the extended state, the deformation component 40 can provide active and controllable radial support for the flexible layer 10, forming a synergistic force system with the spiral wire 20. This improves the repair pipeline's resistance to external pressure and deformation during service, and prevents the lining from collapsing or bulging due to the load of the overlying soil or external disturbance. Thus, while taking into account the flexibility of construction, it greatly improves the safety, reliability and service life of the repair structure.

[0075] In at least one embodiment of this application, the deformation component 40 includes:

[0076] A semicircular plate 41 is disposed on the inner wall of the hollow channel 11, and the axis of the semicircular plate 41 is collinear with the axis of the hollow channel 11.

[0077] The arc-shaped plate 42 is rotatably connected to the semi-circular plate 41 at one end.

[0078] The locking plate 43 has one end rotatably connected to the arc-shaped plate 42, and the other end is housed in the semi-circular plate 41 and can lock with the semi-circular plate 41.

[0079] The locking plate 43 engages with the semi-circular plate 41 to fix the arc-shaped plate 42, so that the arc-shaped plate 42 and the semi-circular plate 41 fit against the inner wall of the hollow channel 11; the locking plate 43 disengages from the semi-circular plate 41 to release the arc-shaped plate 42, so that the trenchless pipeline repair device 100 of the multi-layer composite flexible main pipe can deform radially.

[0080] Please refer to Figures 1-4 Specifically, a semi-circular plate 41 is fixed to the inner wall of the hollow channel 11. The axis of the semi-circular plate 41 is collinear with the axis of the hollow channel 11, which is equivalent to forming a semi-circular inner lining base extending axially inside the tube.

[0081] An arc-shaped plate 42 is rotatably connected at one end to one end of a semi-circular plate 41 via a hinge or pivot, allowing the arc-shaped plate 42 to rotate relative to the semi-circular plate 41 around the hinge point.

[0082] And a snap-fit ​​plate 43, one end of which is rotatably connected to the other end of the arc plate 42, and the other end can be accommodated inside the semi-circular plate 41, and forms a detachable snap-fit ​​engagement with the semi-circular plate 41 at the accommodating position.

[0083] In use, first insert an external flexible wear-resistant elastic tube or wear-resistant pipe (preferably a wear-resistant elastic tube that can withstand high-pressure gas) into the hollow channel 11 along the main pipe axis, so that the wear-resistant elastic tube passes through the channel space reserved between the semi-circular plate 41 and the arc plate 42.

[0084] When the pipeline is in a contracted state, facilitating trenchless traction through narrow locations such as wellheads, bends, and reduced diameter sections, the wear-resistant elastic pipe is in an uninflated or low-pressure state, the semi-circular plate 41 and the arc-shaped plate 42 are basically in contact, and the inner radial occupancy of the hollow channel 11 is small.

[0085] After the multi-layer composite flexible main tube is pulled to the target position, high-pressure gas is introduced into it through the air inlet at one end of the wear-resistant elastic tube. This causes the wear-resistant elastic tube to bulge outward between the semi-circular plate 41 and the arc plate 42. The bulging wear-resistant elastic tube (the wear-resistant elastic tube is existing technology and will not be described in detail here) presses the semi-circular plate 41 and the arc plate 42 against the inner wall of the hollow channel 11, pushing the semi-circular plate 41 and the arc plate 42 to rotate and open radially outward. This causes the flexible layer 10, together with the outer spiral wire 20 and the wear-resistant layer 30, to expand outward and adhere to the original inner wall of the pipe.

[0086] When the outer arc surfaces of the semicircular plate 41 and the arc plate 42 are basically in contact with the inner wall of the hollow channel 11, the rotation of the arc plate 42 drives the locking plate 43 to rotate into the preset locking position inside the semicircular plate 41, so that the locking plate 43 and the semicircular plate 41 are reliably locked together. Thus, without relying on the continuous internal pressure of the wear-resistant elastic tube, the arc plate 42 is fixed in the open state, forming a stable internal support structure. Afterwards, the air supply to the wear-resistant elastic tube can be stopped, and the wear-resistant elastic tube can be depressurized, contracted, or pulled out as needed.

[0087] In the above manner, the deformation component 40 completes the conversion from radial contraction to radial expansion under the drive of high-pressure gas. The locking plate 43 cooperates with the semi-circular plate 41 to lock after expansion, so that the multi-layer composite flexible main tube is reliably radially supported when needed.

[0088] First, by using high-pressure gas to expand the wear-resistant elastic tube within the hollow channel 11 to actively push the semi-circular plate 41 and the arc-shaped plate 42, the radial expansion process of the multi-layer composite flexible main tube is controllable and the force is uniform. This allows the flexible layer 10 and the outer wear-resistant layer 30 to adhere to the inner wall of the original tube as evenly as possible, avoiding problems such as local wrinkling, local suspension, and uneven wall adhesion that occur when a single-layer flexible tube relies on its own rigidity or simple internal pressure. This improves the sealing performance and structural stability after repair.

[0089] Secondly, the multi-layer composite flexible main pipe is extremely soft and occupies little space when not inflated, so that the deformation component 40 can maintain a shrinking diameter and bendable state during the construction traction stage. Combined with the elastic deformation capability of the internal spiral wire 20 structure, it can pass smoothly through the well opening, the diameter change section and the bend, and will not be stuck in a narrow position due to the excessive rigidity of the skeleton, as is the case with the cross steel wire mesh structure.

[0090] When the pipeline needs to pass through wellheads, bends, or reduced diameter sections, the locking plate 43 and the semi-circular plate 41 are released, allowing the locking plate 43 to exit the locking part of the semi-circular plate 41. Under the action of its own weight, external force, or elastic restoring force, the arc plate 42 flips or folds inward, no longer forming a wall-hugging support ring with the semi-circular plate 41. This releases the original open state inside the hollow channel 11, allowing the multi-layer composite flexible main pipe to retract and shrink radially in the circumferential region, achieving flexible deformation in the overall radial direction.

[0091] In at least one embodiment of this application, the maximum distance from the locking plate 43 to the axis of the hollow channel 11 is denoted as a, the maximum distance from the semicircular plate 41 to the axis of the hollow channel 11 is denoted as b, and the maximum distance from the arc plate 42 to the axis of the hollow channel 11 is denoted as c, satisfying the relationship: a < b = c.

[0092] Please refer to Figures 1-4 Specifically, the maximum distance from the snap plate 43 to the axis of the hollow channel 11 is denoted as a, the maximum distance from the semicircular plate 41 to the axis of the hollow channel 11 is denoted as b, and the maximum distance from the arc plate 42 to the axis of the hollow channel 11 is denoted as c, and the relationship a < b = c is satisfied.

[0093] During the transition of the deformation component 40 from a contracted state to an expanded state, high-pressure gas is introduced into the external flexible wear-resistant elastic tube or wear-resistant pipe inside the hollow channel 11. This causes the wear-resistant elastic tube to inflate and compress the semicircular plate 41 and the arc-shaped plate 42, causing them to swing radially outward until the outer arc surfaces of the semicircular plate 41 and the arc-shaped plate 42 are close to and essentially in contact with the inner wall of the hollow channel 11. At this point, the maximum radial distance from the outer edge of the semicircular plate 41 and the arc-shaped plate 42 to the axis of the hollow channel 11 is b and c, respectively. These two distances are designed to be equal, i.e., b = c. This ensures that the two components together form an approximately complete annular support surface at the limit of expansion, continuously fitting against the inner wall of the hollow channel 11.

[0094] The locking plate 43, as the inner component for locking the arc plate 42, has a maximum radial distance of a from its outermost end to the axis of the hollow channel 11 in the locked state, which is less than b, i.e., a < b. This ensures that after the arc plate 42 is turned outward and attached to the wall, and the semicircular plate 41 and the arc plate 42 are enclosed to form a ring support, the locking plate 43 is located inside the ring support structure and will not directly interfere with the inner wall of the hollow channel 11. At the same time, it can be stably housed in the inner locking area of ​​the semicircular plate 41, thereby locking the arc plate 42.

[0095] b=c ensures that when the semicircular plate 41 and the arc plate 42 are radially expanded into place, the distance from their outer edges to the axis of the hollow channel 11 is completely consistent. The two form a continuous and smooth supporting arc in the circumferential direction, so that one plate will first press against the inner wall and the other plate will be suspended in the air. This makes the high-pressure gas expansion process more controllable, and the supporting ring after expansion is subjected to uniform force, avoiding local bulging or stress concentration of the flexible layer 10 due to local overshoot.

[0096] By limiting the maximum radial distance of the locking plate 43 to less than b, i.e., a < b, it can be ensured that when the deformation component 40 is in the open and locked state, the locking plate 43 is always retracted to the inner side of the annular support structure formed by the semicircular plate 41 and the arc plate 42, and will not protrude excessively into the hollow channel 11. This avoids interference with the fluid flow in the channel or the internal tooling equipment, and also prevents the locking plate 43 from accidentally disengaging due to collision with the inner wall or other components during inflation, deflation, traction or operation vibration.

[0097] When the arc plate 42 retracts inward after being released from its locking position, the locking plate 43 can smoothly return to its original position along with the arc plate 42. When the entire deformation assembly 40 switches between opening and closing, the movement trajectory of each plate is clear and does not interfere with each other, which significantly improves the reliability of the mechanism's operation and reduces the risk of jamming.

[0098] In at least one embodiment of this application, the deformation component 40 further includes:

[0099] The first rotating column 44 is rotatably connected at one end to the arc-shaped plate 42, and at the other end to one end of the semi-circular plate 41.

[0100] The second rotating column 45 is rotatably connected at one end to the locking plate 43, and the other end is located at the end of the arc plate 42 away from the semi-circular plate 41.

[0101] Please refer to Figures 1-4 Specifically, one end of the first rotating column 44 is rotatably connected to the arc plate 42, and the other end is set at one end of the semicircular plate 41, so that the arc plate 42 can rotate around the first rotating column 44 relative to the semicircular plate 41.

[0102] One end of the second rotating column 45 is rotatably connected to the locking plate 43, and the other end is located at the end of the arc plate 42 away from the semicircular plate 41, so that the locking plate 43 can rotate relative to the arc plate 42 around the second rotating column 45.

[0103] A mounting hole or mounting seat can be opened at one end of the semicircular plate 41, and one end of the first rotating column 44 is fixed on the semicircular plate 41, while the other end is inserted and fixed in the hinge hole at the corresponding end of the arc plate 42, so that a stable rotating shaft hinge relationship is formed between the arc plate 42 and the semicircular plate 41.

[0104] A mounting base or shaft hole is also provided at the end of the arc plate 42 away from the semicircular plate 41. One end of the second rotating column 45 is fixed on the arc plate 42, and the other end is connected to the rotating hole at one end of the locking plate 43, so that the locking plate 43 can rotate synchronously and relative to the arc plate 42 during the outward flipping and retraction process of the arc plate 42.

[0105] By introducing high-pressure gas into the external wear-resistant elastic tube inside the hollow channel 11, causing it to expand and push the semi-circular plate 41 and the arc plate 42 radially apart, the arc plate 42 rotates around the end of the semi-circular plate 41 at the first rotating column 44, and the locking plate 43 rotates around the end of the arc plate 42 at the second rotating column 45. When the outer arc of the semi-circular plate 41 and the arc plate 42 are close to the inner wall of the hollow channel 11, the locking plate 43 is driven by the second rotating column 45 to rotate into the inner side of the semi-circular plate 41 and complete the locking.

[0106] When the support needs to be released, simply disengage the engagement. The arc-shaped plate 42 rotates inward around the first rotating column 44, while the engaging plate 43 retracts inward around the second rotating column 45 along with the arc-shaped plate 42. The two-stage rotating pair formed by the first rotating column 44 and the second rotating column 45 significantly improves the controllability and repeatability of the mechanism's movements.

[0107] By setting a first rotating column 44 between the semicircular plate 41 and the arc plate 42, the arc plate 42 rotates relative to the semicircular plate 41 with the fixed axis as the center, avoiding the phenomenon of the arc plate 42 tilting, moving or getting stuck under the push of high pressure gas. The force path is clear during the opening process, which is conducive to effectively and evenly converting the expansion pressure of the wear-resistant elastic tube into the radial support force of the flexible layer 10.

[0108] By setting a second rotating column 45 between the arc plate 42 and the locking plate 43, the locking plate 43 can rotate relative to the end of the arc plate 42 while moving with the arc plate 42. Thus, at the end stage when the arc plate 42 is turned outward and attached to the wall, the locking plate 43 can be smoothly guided into the preset locking position inside the semi-circular plate 41.

[0109] In at least one embodiment of this application, the semicircular plate 41 is provided with an arc-shaped groove 411, one end of the locking plate 43 is received in the groove, the inner wall of the semicircular plate 41 is provided with a locking position 412, and the locking plate 43 is provided with a first locking block 431, which can engage with the locking position 412 to fix the arc-shaped plate 42 so that the arc-shaped plate 42 and the semicircular plate 41 surround each other to form an annular plate.

[0110] In at least one embodiment of this application, the locking plate 43 is provided with a second locking block 432, the first locking block 431 is located between the second rotating post 45 and the second locking block 432, and the second locking block 432 is located at the end of the locking plate 43 away from the second rotating post 45.

[0111] In at least one embodiment of this application, the semicircular plate 41 is provided with a spring piece 413, which is located in the groove.

[0112] When the first locking block 431 disengages from the locking position 412, and the second locking block 432 engages with the locking position 412 and continues to expand the annular plate, the second locking block 432 abuts against the spring piece 413, causing the spring piece 413 to generate elastic force, which is then applied to the second locking block 432, ultimately causing the locking plate 43 to disengage from the locking position 412.

[0113] Please refer to Figures 1-4 Specifically, one end of the locking plate 43 is rotatably connected to the arc plate 42 via the second rotating column 45. This end serves as the rotation fulcrum of the locking plate 43. The first locking block 431 is located between the second rotating column 45 and the second locking block 432. The second locking block 432 protrudes from the end away from the second rotating column 45, which is the free end of the locking plate 43.

[0114] An arc-shaped groove 411 is provided on the semi-circular plate 41 that cooperates with the locking plate 43. A spring piece 413 is provided in the groove. The spring piece 413 is preferably arranged along the length of the groove and facing the locking plate 43. It can generate elastic deformation and recovery force when squeezed by the second locking block 432.

[0115] During the process of deformation component 40 transitioning from contraction to expansion, high-pressure gas is introduced into the wear-resistant elastic tube in the hollow channel 11, pushing the semi-circular plate 41 and the arc plate 42 to rotate radially outward, and the locking plate 43 rotates synchronously with the arc plate 42 around the second rotating column 45.

[0116] During the normal expansion phase, the first locking block 431, located in the middle position, engages with the locking position 412 on the semi-circular plate 41, locking the arc plate 42 in the normal expansion position. When high-pressure gas is continuously introduced into the wear-resistant elastic tube to further expand the annular plate, the first locking block 431 disengages from the locking position 412 during rotation and is in a free state. At this time, the second locking block 432, located at the free end of the locking plate 43, rotates to the locking position 412 and engages with it. Thus, during the over-expansion phase, the second locking block 432 temporarily replaces the first locking block 431 to perform the locking and limiting functions.

[0117] Under continued stretching or external force, the second locking block 432 moves further along the slide groove and comes into contact with the spring piece 413 in the slide groove. When the spring piece 413 is compressed, it generates elastic force, which is transmitted to the locking plate 43 through the second locking block 432. This generates a reverse elastic force on the locking plate 43, causing the second locking block 432 to move away from the spring piece 413. This causes the second locking block 432 to finally disengage from the locking position 412. Under the action of the elastic force of the spring piece 413 and the weight or restoring force of the mechanism, the locking plate 43 moves in the opposite direction and returns to its original position, thereby releasing the locking position 412 and completing the transition from locking to automatic unlocking.

[0118] By setting the first locking block 431 between the second rotating column 45 and the second locking block 432, it can reliably engage with the locking position 412 under conditions of small rotation angle and large lever arm, and undertake the main locking function under normal opening conditions, ensuring that the arc plate 42 is in a stable locked state after conventional radial opening, and will not be accidentally disengaged due to slight vibration or small deformation.

[0119] When the expansion exceeds the normal operating range, the second locking block 432 compresses the spring 413 to obtain elastic reverse thrust, actively pushing the locking plate 43 to disengage from the locking position 412, realizing automatic unlocking under overload, and preventing the semi-circular plate 41, arc plate 42, spiral wire 20 and flexible layer 10 from being forcibly rigidly constrained due to continuous overload, thus fundamentally improving the overload protection capability of the device.

[0120] It should be noted that the length of the second locking block 432 is greater than the length of the first locking block 431, so that the second locking block 432 can generate elastic force after abutting against the spring piece 413, thereby achieving disengagement.

[0121] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0122] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A trenchless pipeline repair device for multi-layer composite flexible main pipes, characterized in that, include: A flexible layer with a hollow channel in the middle; Spiral wires are disposed within the flexible layer and spirally arranged along the length of the flexible layer; A wear-resistant layer is wrapped around the outer surface of the flexible layer; When the trenchless pipeline repair device of the multi-layer composite flexible main pipe deforms, the spiral wire deforms along its spiral direction.

2. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 1, characterized in that, The spiral wires include multiple sets, and the multiple sets of spiral wires are arranged at equal angles inside the flexible layer with the axis of the flexible layer as the axis.

3. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 1, characterized in that, The thickness of the wear-resistant layer is 1mm-1.5mm.

4. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 1, characterized in that, The trenchless pipeline repair device for the multi-layer composite flexible main pipe also includes: A deformation component is disposed within the hollow channel, the deformation component being used to support the flexible layer in a radially expanded state, or to release the flexible layer in a contracted state.

5. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 4, characterized in that, The deformation component includes: A semicircular plate is disposed on the inner wall of the hollow channel, and the axis of the semicircular plate is collinear with the axis of the hollow channel; An arc-shaped plate, one end of which is rotatably connected to the semi-circular plate; The locking plate has one end rotatably connected to the arc-shaped plate, and the other end is housed in the semi-circular plate and can lock with the semi-circular plate. The locking plate engages with the semi-circular plate to fix the arc-shaped plate, so that the arc-shaped plate and the semi-circular plate fit against the inner wall of the hollow channel; the locking plate disengages from the semi-circular plate to release the arc-shaped plate, so that the trenchless pipeline repair device of the multi-layer composite flexible main pipe can deform radially.

6. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 5, characterized in that, The maximum distance from the snap-fit ​​plate to the axis of the hollow channel is denoted as a, the maximum distance from the semi-circular plate to the axis of the hollow channel is denoted as b, and the maximum distance from the arc-shaped plate to the axis of the hollow channel is denoted as c, satisfying the relationship: a < b = c.

7. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 5, characterized in that, The semicircular plate has an arc-shaped groove, and one end of the locking plate is received in the groove. The inner wall of the semicircular plate has a protruding locking position, and the locking plate has a protruding first locking block. The first locking block can engage with the locking position to fix the arc-shaped plate so that the arc-shaped plate and the semicircular plate can surround and form an annular plate.

8. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 7, characterized in that, The deformation component further includes: The first rotating column is rotatably connected to the arc-shaped plate at one end and located at one end of the semi-circular plate at the other end; The second rotating column is rotatably connected at one end to the locking plate, and at the other end of the arc-shaped plate away from the semi-circular plate.

9. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 8, characterized in that, The locking plate is provided with a second locking block, the first locking block is located between the second rotating column and the second locking block, and the second locking block is located at the end of the locking plate away from the second rotating column.

10. The trenchless pipeline repair device for multi-layer composite flexible main pipe according to claim 9, characterized in that, The semicircular plate is provided with a spring piece, which is located in the groove. When the first locking block disengages from the locking position, and the second locking block engages with the locking position and continues to expand the annular plate, the second locking block abuts against the spring piece, causing the spring piece to generate elastic force, which is then applied to the second locking block, ultimately causing the locking plate to disengage from the locking position.

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