Local non-excavation repair opening device and method for HDPE pipe network

Abstract

An HDPE pipe network local non-excavation repair opening device and method comprises a fixing frame, a hydraulic oil cylinder is installed on the fixing frame, the output end of the hydraulic oil cylinder is connected with a connecting rod, at least two sets of axial sliding blocks are fixed to the connecting rod at intervals, and a plurality of first sliding grooves are formed in the edge of each set of axial sliding blocks in the circumferential direction; one side of the radial sliding block is in sliding fit with the first sliding groove through an inclined face, and the other side of the radial sliding block is in sliding fit with the fixing frame and axially limited. When the hydraulic oil cylinder stretches out and draws back, the axial sliding blocks move in the axial direction, and the radial sliding blocks move in the radial direction. The radial sliding blocks on the two sets of axial sliding blocks are in one-to-one correspondence and are fixedly provided with supporting plates, the circumferential supporting plates are sleeved with expansion rings, and the expansion rings are expanded at the defect positions of the pipeline. According to the HDPE pipe network local non-excavation repair opening device and method, the ring stiffness of the defect position can be improved, and the service life of the pipe network is prolonged.

Description

Technical Field

[0001] The invention relates to the field of pipe propping devices, in particular to a propping device and method for local trenchless repair of a HDPE pipe network. Background Art

[0002] During the operation of urban underground pipelines, with the increase of their service life and the influence of pipe quality or construction quality, the first defects that appear are mainly structural and functional defects such as local cracks, interface damage, deformation, and rupture. The ring stiffness of HDPE pipes is poor, and the risk of collapse and rupture is greater. If not handled in time, the defects of the entire pipe section will spread, leading to environmental pollution and safety incidents, and local repairs of the pipeline network are required.

[0003] The traditional local trenchless repair technology for HDPE pipes is mainly implemented under the working conditions that the internal space of the original pipeline is intact, such as local resin curing and UV curing repair of the entire pipe section. When the local collapse and deformation of the pipeline causes the internal space of the pipeline to be incomplete, the pipeline needs to be pre-treated first, and due to the poor stiffness of the resin bonding ring, the spread of defects cannot be effectively curbed; the overall UV curing repair cost is relatively high, and it is necessary to find a method that can more effectively deal with local defects of HDPE pipes and save costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a local non-excavation repair and propping device and method for a HDPE pipe network, which can be lined with a stainless steel expansion ring to repair pipeline defects, improve the ring stiffness at the defective part, and extend the service life of the pipe network.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A local non-excavation repair and propping device for a HDPE pipe network comprises a fixed frame, a hydraulic cylinder is installed on the fixed frame, an output end of the hydraulic cylinder is connected to a connecting rod, at least two groups of axial sliders are fixed on the connecting rod at intervals, a plurality of first sliding grooves are opened in the circumferential direction of the edge of each group of axial sliders, one side of the radial slider is slidably matched with the first sliding groove through an inclined surface, and the other side of the radial slider is slidably matched with the fixed frame and axially limited; when the hydraulic cylinder is extended and retracted, the axial slider moves in the axial direction, and the radial slider moves in the radial direction; The radial sliders on the two groups of axial sliders correspond to each other and are fixed with support plates. The circumferential support plate outer sleeve is provided with an expansion ring, which is expanded and tightened at the defective position of the pipeline.

[0006] The fixing frame comprises a first fixing support and a second fixing support. The first fixing support and the second fixing support have the same structure and are fixed into one body by a fixing rod.

[0007] The first fixed support and the second fixed support are both cylindrical.

[0008] A center hole is provided in the center of the first fixed support and the second fixed support, and a slip ring is fixed in the center hole, and the slip ring is slidably matched with the connecting rod; a plurality of second sliding grooves are provided on the circumferential edge of the first fixed support and the second fixed support, and the number and position of the second sliding grooves correspond to the radial sliding block; a limiting ring is installed on one side of the first fixed support and the second fixed support, and a third sliding groove is opened on the limiting ring, and the number and position of the third sliding groove correspond to those of the second sliding groove, and the width of the third sliding groove is smaller than that of the second sliding groove, and they jointly limit the axial position of the radial sliding block and slide radially relative to each other.

[0009] The radial slider includes a slider body, one side of the slider body has an inclined surface and protrudes to the left and right to form a first limiting portion, and the first limiting portion slides in cooperation with the first sliding groove; a T-shaped second limiting portion is fixed on the other side of the slider body, and the second limiting portion and the slider body form a radial groove, and the second limiting portion slides radially with the second sliding groove and the third sliding groove to be axially limited.

[0010] The axial sliding block is cylindrical and has a plurality of through holes circumferentially formed thereon, through which the fixing rods can freely pass.

[0011] The connecting rod comprises a first extension rod and a second extension rod, the first extension rod and the second extension rod are threadedly connected, and the axial sliding block is fixed and limited with the first extension rod or the second extension rod by a nut.

[0012] The outer side of each group of radial sliding blocks is fixedly connected to the support plate through cross countersunk screws and pads.

[0013] The first sliding groove is in a convex shape.

[0014] A method for local non-excavation repair and propping up of a HDPE pipe network comprises the following steps: Step 1: First, put the expansion ring on the outside of the support plate, and use a conventional traction device to lower the device to the defective position of the pipe network; Step 2: Start the hydraulic cylinder. At this time, the connecting rod drives the two axial sliders to move axially synchronously. Due to the axial limiting effect of the limit ring and the first fixed support and the second fixed support, the axial slider directly pushes the radial slider to move radially. Step 3: Since the support plate is fixed on the radial slider, the support plate also moves radially with the radial slider. As the thrust of the connecting rod increases, the support plate can repair the pipeline space defects while expanding the expansion ring and push the expansion ring to expand at the defective position of the pipeline.

[0015] The present invention provides a device and method for local non-excavation repair and propping up of a HDPE pipe network, which has the following technical effects: 1) This device has a simple structure and operation method. It is suitable for local non-excavation repair of HDPE pipe networks, with little impact on the ground. It is also suitable for spatial repair of incompletely collapsed pipe networks. This device can play a good repair role in the early stage of urban pipe network operation and maintenance.

[0016] 2) As the expansion device expands, the partially collapsed pipe section is repaired, and the expansion ring is positioned at the defective pipe section to achieve local repair of the HDPE pipe under non-excavation conditions.

[0017] 3) This device uses stainless steel expansion rings to repair pipeline defects. The ring stiffness is higher than that of general repair materials and can slow down the collapse speed of local defects.

[0018] 4) Compared with the reference document 1 "CN202110206497-A pipeline support repair device and pipeline repair method", the device of this application adopts expansion ring repair. Unlike the hose curing process used in the patent of reference document 1, this device uses a mechanical jacking method to open the expansion ring while repairing the pipeline space defects. This patent focuses on local repair of the pipeline network, and the repair method is simpler, lower cost and shorter time.

[0019] 5) Compared with the comparative document 2 "CN202321165894-A expandable intervertebral fusion device", the device of this application adopts hydraulic jacking, while the patent of comparative document 2 adopts threaded jacking. The jacking force of this patent is greater (the jacking force can be configured with different hydraulic stations according to needs. Generally, the thrust of a small hydraulic station is 2~3t. The hydraulic station drives the hydraulic cylinder to apply force, and the steel ring itself is self-locking and can only expand outward, and cannot rebound). In addition, the positioning method of its expansion body is different. This patent uses the convex groove of the axial slider and the radial slider to hinge and limit, and the structure is simpler. There are many structures that are expanded by wedge blocks. The expansion body of the device of this application is hinged and limited by the convex groove of the axial slider and the radial slider. It has a simple structure, saves materials, reduces the weight of the equipment, and makes it more flexible to move inside the pipeline network. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a cross-sectional view of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the present invention (first perspective).

[0022] Figure 3 It is a schematic diagram of the structure of the present invention (second viewing angle).

[0023] Figure 4 It is a schematic diagram of the connection of various components at the first extension rod in the present invention.

[0024] Figure 5It is a schematic diagram of the connection between the radial sliding block and the first fixed support in the present invention.

[0025] Figure 6 It is a connection diagram of the first fixed support 1 and the second fixed support in the present invention.

[0026] Figure 7 This is a cross-sectional view of the installation of the axial sliding block in the present invention.

[0027] Figure 8 It is a schematic structural diagram of the first fixed support in the present invention.

[0028] Fig. 9 It is a schematic structural diagram of the radial sliding block in the present invention.

[0029] Fig.10 It is a schematic diagram of the structure of the axial sliding block in the present invention.

[0030] In the figure: a first fixed support 1, a second fixed support 2, a limiting ring 3, a radial slider 4, an axial slider 5, a fixing rod 6, a cushion block 7, a support plate 8, a first extension rod 9, a second extension rod 10, a cross countersunk screw 11, a hydraulic cylinder 12, a copper sleeve 13, a tightening ring 14, a center hole 1.1, a second slide groove 1.2, a third slide groove 3.1, an inclined surface 4.1, a first limiting portion 4.2, a second limiting portion 4.3, a slider body 4.4, a radial groove 4.5, and a first slide groove 5.1. DETAILED DESCRIPTION

[0031] like Figure 1-4 As shown, a local non-excavation repair and propping device for a HDPE pipe network is made of aluminum alloy material, is light in weight, and is easy to move in the pipe. The device includes a first fixed support 1 and a second fixed support 2, and the first fixed support 1 and the second fixed support 2 are fixed together by a fixed rod 6. A hydraulic cylinder 12 is installed on the outside of the first fixed support 1, and the piston rod of the hydraulic cylinder 12 passes through the center hole 1.1 of the first fixed support 1 and is detachably threadedly connected and fixed with the first extension rod 9, and the other end of the first extension rod 9 is detachably threadedly connected and fixed with the second extension rod 10. The second extension rod 10 also needs to pass through the center hole 1.1 of the second fixed support 2.

[0032] A copper sleeve 13 is fixed in the center holes 1.1 of the first fixed support 1 and the second fixed support 2. The first extension rod 9 and the second extension rod 10 are slidably matched with the copper sleeve 13, which is beneficial to reduce the wear of the extension rods.

[0033] An axial slider 5 is fixedly installed at the end of the first extension rod 9 and the second extension rod 10 through nuts respectively. The axial slider 5 is cylindrical and has a plurality of first slide grooves 5.1 arranged along the circumferential direction on the edge. The first slide groove 5.1 is convex and has a lower bottom surface which is an inclined surface inclined downward toward the hydraulic cylinder 12 side, so as to limit the radial movement of the radial slider 4.

[0034] A radial slider 4 is slidably arranged in the first slide groove 5.1 of each axial slider 5. One side of the radial slider 4 has an inclined surface 4.1 and protrudes to the left and right to form a first limiting portion 4.2, which can be slidably matched with the convex first slide groove 5.1. The other end of the radial slider 4 is fixed with a second limiting portion 4.3 with a T-shaped cross section. The second limiting portion 4.3 and the slider body 4.4 of the radial slider 4 form a radial groove 4.5.

[0035] The corresponding first fixed support 1 and second fixed support 2 are cylindrical and have circumferentially distributed second slide grooves 1.2 corresponding to the number and position of the radial slider 4. The second slide grooves 1.2 are distributed along the radial direction of the first fixed support 1 and the second fixed support 2. In addition, the limiting ring 3 is detachably fixed on the first fixed support 1 and the second fixed support 2 by screws. The limiting ring 3 is provided with a third slide groove 3.1 corresponding to the position of the second slide groove 1.2. The width of the third slide groove 3.1 is smaller than the width of the second slide groove 1.2. The second limiting portion 4.3 of the radial slider 4 is slidably matched with the second slide groove 1.2 and the third slide groove 3.1 and can move radially along the first fixed support 1 or the second fixed support 2.

[0036] The radial sliding blocks 4 at the first fixed support 1 and the second fixed support 2 are arranged opposite to each other, and the outer side of each group of radial sliding blocks 4 is fixedly connected to the support plate 8 through a cross countersunk screw 11 and a spacer 7.

[0037] The expansion ring 14 is made of stainless steel and has a self-locking device after being expanded to keep the expansion ring in the expanded state. The expansion ring is wrapped with an elastic sealing ring on the outside, which fits and seals with the inner wall of the pipe network after being expanded.

[0038] Working principle and process: 1) First, put the expansion ring 14 on the outside of the support plate 8, and use a conventional traction device to lower the device to the defective position of the pipe network; 2) Start the hydraulic cylinder 12. At this time, the first extension rod 9 and the second extension rod 10 drive the two axial sliders 5 to move axially synchronously. Due to the axial restriction of the limit ring 3 and the first fixed support 1 and the second fixed support 2, the axial slider 5 directly pushes the radial slider 4 to move radially; 3) Since the support plate 8 is fixed on the radial slider 4, the support plate 8 moves radially with the radial slider 4. As the thrust of the first extension rod 9 and the second extension rod 10 increases, the support plate 8 can repair the pipeline space defects while expanding the expansion ring 14, push the expansion ring 14 to expand at the defective position of the pipeline, and then remove the expansion device. The expansion ring self-locks and maintains the expanded state, which can repair the local defects of the HDPE pipe.

Claims

1. A local non-excavation repair and propping device for HDPE pipe network, characterized by: The invention comprises a fixed frame, a hydraulic cylinder (12) is installed on the fixed frame, the output end of the hydraulic cylinder (12) is connected to a connecting rod, at least two groups of axial sliders (5) are fixed on the connecting rod at intervals, a plurality of first sliding grooves (5.1) are opened in the circumferential direction of the edge of each group of axial sliders (5), one side of the radial slider (4) is slidably matched with the first sliding groove (5.1) through an inclined surface, and the other side of the radial slider (4) is slidably matched with the fixed frame and axially limited; when the hydraulic cylinder (12) is extended or retracted, the axial slider (5) moves in the axial direction, and the radial slider (4) moves in the radial direction; The radial slide blocks (4) on the two groups of axial slide blocks (5) correspond to each other and are fixed with support plates (8). The circumferential support plates (8) are covered with expansion rings (14), and the expansion rings (14) are expanded at the defective positions of the pipeline.

2. A local non-excavation repair and propping device for HDPE pipe network according to claim 1, characterized in that: The fixing frame comprises a first fixing support (1) and a second fixing support (2); the first fixing support (1) and the second fixing support (2) have the same structure and are fixed into one piece via a fixing rod (6).

3. A local non-excavation repair and propping device for HDPE pipe network according to claim 2, characterized in that: The first fixed support (1) and the second fixed support (2) are both cylindrical.

4. A local non-excavation repair and propping device for HDPE pipe network according to claim 3, characterized in that: A center hole (1.1) is provided at the center of the first fixed support (1) and the second fixed support (2), a slip ring is fixed in the center hole (1.1), and the slip ring is slidably matched with the connecting rod; a plurality of second slide grooves (1.2) are provided in the circumferential direction of the upper edges of the first fixed support (1) and the second fixed support (2), and the number and position of the second slide grooves (1.2) correspond to the radial slider (4); a limiting ring (3) is installed on one side of the first fixed support (1) and the second fixed support (2), and a third slide groove (3.1) is provided on the limiting ring (3), and the number and position of the third slide groove (3.1) correspond to those of the second slide groove (1.2), and the width of the third slide groove (3.1) is smaller than that of the second slide groove (1.2), and the third slide groove (3.1) jointly limits the axial position of the radial slider (4) and slides radially relative to each other.

5. A local non-excavation repair and propping device for HDPE pipe network according to claim 4, characterized in that: The radial slider (4) comprises a slider body (4.4), one side of the slider body (4.4) is provided with an inclined surface (4.1) and protrudes to the left and right to form a first limiting portion (4.2), the first limiting portion (4.2) and the first sliding groove (5.1) being slidably matched; the other side of the slider body (4.4) is fixed with a T-shaped second limiting portion (4.3), the second limiting portion (4.3) and the slider body (4.4) forming a radial groove (4.5), the second limiting portion (4.3) and the second sliding groove (1.2) and the third sliding groove (3.1) sliding in the radial direction to be axially limited.

6. A local non-excavation repair and propping device for HDPE pipe network according to claim 5, characterized in that: The axial slider (5) is cylindrical, and has a plurality of through holes (5.2) circumferentially formed on the axial slider (5), the through holes (5.2) allowing the fixing rods (6) to freely pass through.

7. A local non-excavation repair and propping device for a HDPE pipe network according to claim 6, characterized in that: The connecting rod comprises a first extension rod (9) and a second extension rod (10); the first extension rod (9) and the second extension rod (10) are threadedly connected to each other; and the axial sliding block (5) and the first extension rod (9) or the second extension rod (10) are fixed and limited by a nut.

8. A local non-excavation repair and propping device for a HDPE pipe network according to claim 7, characterized in that: The outer side of each group of radial sliding blocks (4) is fixedly connected to the support plate (8) via cross countersunk screws (11) and pads (7).

9. A local non-excavation repair and propping device for HDPE pipe network according to claim 8, characterized in that: The first sliding groove (5.1) is in a convex shape.

10. The method for repairing a pipeline using a local non-excavation repair and propping device for a HDPE pipe network according to claim 9, comprising the following steps: Step 1: First, put the expansion ring (14) on the outside of the support plate (8), and use a conventional traction device to lower the device to the defective position of the pipe network; Step 2: Start the hydraulic cylinder (12), at which time the connecting rod drives the two axial sliders (5) to move axially synchronously. Due to the axial limiting effect of the limit ring (3) and the first fixed support (1) and the second fixed support (2), the axial slider (5) directly pushes the radial slider (4) to move radially; Step 3: Since the support plate (8) is fixed on the radial slider (4), the support plate (8) also moves radially with the radial slider (4). As the thrust of the connecting rod increases, the support plate (8) can repair the pipeline space defect while expanding the expansion ring (14) and push the expansion ring (14) to expand at the defective position of the pipeline.

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