Pipe support device and method of controlling the same

Abstract

The application provides a pipeline supporting device and a control method thereof, which comprises a lower supporting assembly and an upper supporting assembly, the lower supporting assembly and the upper supporting assembly are hingedly connected with a connecting seat; further comprising a jacking hydraulic cylinder and a resetting hydraulic cylinder, both ends of the two hydraulic cylinders are respectively hingedly connected with the lower supporting assembly and the upper supporting assembly; the jacking hydraulic cylinder can be radially jacked to the pipeline, and then reset by the resetting hydraulic cylinder, which makes the hydraulic driving force directly jacked to the inner wall of the pipeline through the jacking hydraulic cylinder, and does not need to be transmitted by using the lever principle as in the prior art, so that the hydraulic driving force lost due to conversion is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of municipal pipeline trenchless operation, in particular to a supporting device for pipeline repair and a control method thereof. BACKGROUND

[0002] The underground pipelines in cities and towns can be roughly divided into two categories, namely gravity pipelines and pressure pipelines. The gravity pipeline mainly refers to a pipeline in which the fluid flows by gravity, mainly including sewage pipelines, rainwater pipelines, etc. The pressure pipeline mainly refers to a pipeline in which the fluid moves under the action of the pressure in the pipeline, mainly including city water supply pipelines, gas pipelines, etc. Since the 1980s, plastic drainage pipelines have been widely used in domestic drainage pipelines due to their obvious advantages such as light weight, corrosion resistance, easy installation, and small water flow resistance. However, in recent years, it has been found that in poor geological conditions, soft strata, and coastal areas, such pipelines will deform and collapse after being buried for a short time, causing serious structural defects. Figure 1 As shown in the figure, the typical plastic drainage pipeline defect mainly shows "V" shape subsidence deformation, which seriously reduces the flow area of the existing pipeline and affects the sewage collection of the sewage pipeline. The main causes of such defects are poor pipe quality, insufficient backfill compaction during pipeline construction, and excessive road load.

[0003] Trenchless pipeline repair technology has been developed for nearly 40 years in foreign countries, and it has the advantages of low comprehensive cost, good construction safety, short construction period, no influence on traffic, and small environmental impact. On the premise of not affecting the urban environment, it can achieve the purpose of repairing underground pipelines. Figure 2 , Figure 3 is an example of a pipeline supporting device in the prior art, which is mainly used for trenchless repair construction of underground drainage pipelines and mainly aims at local collapse and deformation of the pipeline. In pipeline repair projects, if small-diameter pipelines need to be repaired due to collapse and deformation, the human body cannot enter such small-diameter pipelines. At this time, one is pipeline replacement construction, and the other is to excavate the road surface for construction. Pipeline replacement construction greatly increases the engineering cost, and excavating the road surface for construction is time-consuming and laborious, with a long construction period and a large impact on road traffic. The use of the pipeline supporting device can well solve the above problems. The working principle is that the hydraulic cylinder is arranged along the axial direction of the pipeline, and when the hydraulic cylinder is pushed forward, two levers are driven to support the inner wall of the pipeline upward and downward, respectively. However, such a supporting device has the problem of low conversion efficiency of the hydraulic cylinder thrust into vertical supporting force, and the transmission structure is complex and easy to be jammed by debris in the pipeline. SUMMARY

[0004] The present application aims to at least solve one of the problems in the prior art or related art. In order to achieve the above-mentioned purpose, the technical scheme of the present application provides a pipeline support device, comprising:

[0005] a lower support assembly for supporting the inner wall of the pipeline downward, and an upper support assembly for supporting the inner wall of the pipeline upward, wherein the lower support assembly and the upper support assembly are hingedly connected to the connecting seat;

[0006] a jacking hydraulic cylinder, the two ends of which are hingedly connected to the lower support assembly and the upper support assembly, and the jacking hydraulic cylinder can jacking along the radial direction of the pipeline;

[0007] a reset hydraulic cylinder, the two ends of which are hingedly connected to the lower support assembly and the upper support assembly, and the reset hydraulic cylinder can provide a reset pulling force along the radial direction of the pipeline when the pipeline support device is folded;

[0008] a hydraulic drive part connected to the jacking hydraulic cylinder and the reset hydraulic cylinder through high-pressure oil pipes.

[0009] Preferably, it further comprises a three-position four-way valve having a P port, a T port, an A port and a B port, wherein the P port is connected to the hydraulic drive part;

[0010] the T port is an oil return port and is communicated with an oil return tank;

[0011] the A port is connected to the inner cavity of the jacking hydraulic cylinder;

[0012] the B port is connected to the rod cavity oil port of the reset hydraulic cylinder;

[0013] when the jacking hydraulic cylinder is jacking, the valve core of the three-position four-way valve is in the first position, the P port supplies oil to the A port, and the B port is connected to the T port for return flow;

[0014] in the second position, the valve core of the three-position four-way valve is in the cut-off position, and the P port, the T port, the A port and the B port are all cut off;

[0015] when the pipeline support device is folded, the valve core of the three-position four-way valve is in the third position, the A port is connected to the T port for return flow, and the P port supplies oil to the B port.

[0016] Preferably, it further comprises a control system in electrical signal or wireless communication with the hydraulic drive part and capable of controlling the start and stop of the hydraulic drive part.

[0017] Preferably, the lower support assembly further comprises a fixedly connected lower arc plate and a lower connecting arm, the curvature of the lower arc plate is adapted to the shape of the inner wall of the pipeline, and the lower connecting arm is hingedly connected to the connecting seat;

[0018] the upper support assembly has the same structure as the lower support assembly, and the upper support assembly and the lower support assembly are symmetrically distributed relative to the center line of the support device for pipeline repair.

[0019] Preferably, the monitoring camera is installed on the connecting seat and can transmit a video signal to the control system.

[0020] Additional aspects and advantages of the present application will become apparent from the following description with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 A typical pipe inward V-shaped collapse defect is shown;

[0023] Figure 2 A schematic view of a prior art pipe internal strutting device in a closed state is shown;

[0024] Figure 3 A schematic view of a prior art pipe internal strutting device in a strutting state is shown;

[0025] Figure 4 A schematic view of a pipe support device of the present embodiment in a closed state is shown;

[0026] Figure 5 A schematic view of a pipe support device of the present embodiment in a strutting state is shown;

[0027] Figure 6 Another perspective view of a pipe support device of the present embodiment in a strutting state is shown.

[0028] Figure 7 A hydraulic pipe connection diagram of a pipe support device of the present embodiment is shown.

[0029] wherein, Figures 1 to 7 The correspondence between the marks and the structures in the drawings is as follows:

[0030] 10: lower support assembly, 11: lower arc plate, 12: lower connecting arm, 20: upper support assembly, 21: upper arc plate, 22: upper connecting arm, 30: connecting seat, 40: reset hydraulic cylinder, 41: rodless cavity oil port, 42: rod cavity oil port, 50: jacking hydraulic cylinder, 51: cylinder body, 52: inner cavity, 60: three-position four-way valve; 70: hydraulic drive part; A: jacking direction of the support device in the prior art, F: force direction of the hydraulic cylinder of the support device in the prior art, A1: jacking direction of the support device of the present application, A1: force direction of the jacking hydraulic cylinder of the support device of the present application. DETAILED DESCRIPTION

[0031] In order to make the above objects, features and advantages of the present application more clearly understood, the following further describes the present application with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other manners different from those described herein, and therefore the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0033] The following refers to Figures 1 to 7 Fig. describes some embodiments according to the present application.

[0034] Embodiment 1

[0035] This embodiment proposes a support device for pipeline repair, which can be used to repair defects including but not limited to V-shaped invagination of the pipeline as shown in Figure 1 For example, it is found through detection that the DN500 corrugated pipe drainage pipeline along the main road of the commercial district of a coastal city has a serious V-shaped deformation, the pipeline is partially broken, and the surrounding silt enters the inside of the pipeline, making the sewage unable to pass effectively, resulting in the overflow of upstream sewage from the inspection well. The pipeline to be repaired is in a busy traffic area, and excavation repair will have a large impact, so it is proposed to use trenchless repair technology to repair it. The existing trenchless repair technology relies on the original pipeline shape to form a lining, but the pipeline deformation and collapse in this project are serious, and it has basically lost its original shape, so the deformed and collapsed parts must be pretreated before using the trenchless repair technology.

[0036] The support device for pipeline repair proposed in this embodiment is used to treat the collapsed pipe section described above, please refer to Figures 4-7 The support device for pipeline repair has a supporting state and a retracted state. In the supporting state, the lower support assembly 10 is used to support the inner wall of the pipeline downward, the upper support assembly 20 is used to support the inner wall of the pipeline upward, the lower support assembly 10 and the upper support assembly 20 are hingedly connected with the connecting seat 30, the jacking hydraulic cylinder 50 has two ends hingedly connected with the lower support assembly 10 and the upper support assembly 20, the jacking hydraulic cylinder 50 can be jacked along the radial direction of the pipeline, and the hydraulic drive part is connected with the jacking hydraulic cylinder 50 through a high-pressure oil pipe.

[0037] The jacking hydraulic cylinder 50 can be a single-acting hydraulic cylinder, i.e. a piston type hydraulic cylinder with a piston rod on one side and pressure oil supplied to the piston rod on one side only. The piston only works in one direction, and the return stroke is achieved by using a return spring, self-weight or load to push the piston back. In this embodiment, the jacking hydraulic cylinder 50 does not need the piston rod to be frequently, quickly and repeatedly extended or retracted during operation, but has a high requirement for jacking capacity. Therefore, a single-acting hydraulic cylinder is selected to output more jacking force under the same cylinder diameter.

[0038] To assist the support device in turning from the supporting state to the folding state, a reset hydraulic cylinder 40 can be added, which includes a rod cavity and a rodless cavity. The rod cavity is connected to the hydraulic drive part through a high-pressure oil pipe. The reset hydraulic cylinder 40 is also a single-acting hydraulic cylinder, and high-pressure hydraulic oil is supplied to the rod cavity only when the support device needs to be folded, so as to pull the upper and lower support assemblies inward to shrink in the direction of the jacking hydraulic cylinder 50. The two ends of the reset hydraulic cylinder 40 are connected to the lower connecting arm 12 and the upper connecting arm 22, respectively. During the jacking process of the jacking hydraulic cylinder 50, the piston rod of the reset hydraulic cylinder 40 is passively moved out of the cylinder body, but in the folding state, the rod cavity of the reset hydraulic cylinder 40 enters the high-pressure hydraulic medium to perform the folding action.

[0039] When repairing a deformed or collapsed plastic pipeline, the following steps can be included:

[0040] Step 1: Clean the deformed or collapsed plastic pipeline; if necessary, the collapsed part needs to be excavated;

[0041] Step 2: Excavate the soil in 300mm per foot, and immediately implement support after excavating each foot. Introduce the support device through the upstream inspection well, and introduce the support device into the deformed or collapsed area of the deformed or collapsed plastic pipeline. Adjust the position of the repair device so that the upper and lower support assemblies are directly below the deformed or collapsed area of the deformed or collapsed plastic pipeline;

[0042] Step 3: The operator inputs a command to the controller to start the driver to drive the jacking hydraulic cylinder 50, so that the upper and lower support assemblies lift the deformed or collapsed plastic pipeline to restore it to its original shape. The driver drives the upper and lower support assemblies to shrink, so that they are separated from the plastic pipeline. After the steel pipe lining is completed, the next foot of excavation can be processed, and this process is repeated until the entire deformed part is excavated. After the pipeline is restored to its original shape and the pipe lining is completed, the gap outside the pipe lining is filled with cement slurry, and the internal debris and spilled cement are cleaned.

[0043] Step 4: After the construction is completed, the repair device is removed from the plastic pipeline by pulling the rope.

[0044] When the output end of the jacking hydraulic cylinder 50 jacks upward, and the upper support assembly 20 moves along the output direction, the upper and lower support assemblies rotate relative to the hinge of the jacking hydraulic cylinder 50 and the connecting seat 30, and the upper and lower support assemblies expand away from the jacking hydraulic cylinder 50. This state is a support state, the jacking hydraulic cylinder 50 is in contact with the pipe wall, thereby completing the supporting work, and creating conditions for subsequent pipeline detection and repair work. When the output end of the reset hydraulic cylinder 40 moves along the opposite direction of the output direction of the jacking hydraulic cylinder 50, the upper and lower support assemblies shrink towards the jacking hydraulic cylinder 50. This state is a shrinkage state, which makes the overall shape of the pipeline supporting device smaller, so that the pipeline supporting device can move in a smaller pipeline, thereby facilitating the operation of the staff.

[0045] Because the jacking hydraulic cylinder 50 can jack along the radial direction of the pipeline, the hydraulic driving force is directly transmitted to the inner wall of the pipeline through the jacking hydraulic cylinder 50, without the need for transmission by the lever principle as in the prior art, thereby reducing the loss of hydraulic driving force due to conversion.

[0046] In this embodiment, the aforementioned support device is used to non-excavation repair the small-diameter pipeline with deformation and collapse defects, restore the original pipeline water capacity, and strengthen the pipeline structure. During engineering acceptance, closed water test and lining material mechanical property detection are carried out, and the acceptance is qualified. The engineering construction is completely carried out in a non-excavation manner, the construction period is short, the impact on traffic and society is small, and the comprehensive cost has obvious advantages compared with the excavation and replacement of the pipeline, and is recognized by the management unit. Therefore, this repair method is popularized and applied in the repair of similar defect pipelines below DN800 in the local area.

[0047] Embodiment 2

[0048] In addition to the features of the foregoing embodiments, this embodiment further includes a three-position four-way valve 60 having a P port, a T port, an A port, and a B port. The three-position four-way valve itself is prior art and a conventional hydraulic reversing valve. For example, the three-position four-way reversing valve can be understood as being composed of a two-position four-way reversing valve and a stationary position. The three-position four-way reversing valve has various forms of neutral position functions, and can be a spool valve structure or a switch valve structure.

[0049] In the embodiment, the P port is connected with the hydraulic drive part 70; the T port is an oil return port and is communicated with an oil return tank; the A port is connected with the inner cavity 52 of the jacking hydraulic cylinder 50; and the B port is connected with the rod cavity oil port 42 of the reset hydraulic cylinder 40. When the jacking hydraulic cylinder 50 is jacked, the valve core of the three-position four-way valve 60 is at the first position, the P port supplies oil to the A port, and the B port is connected with the T port for return. At the second position, the valve core of the three-position four-way valve 60 is at the cut-off position, the P port, the T port, the A port and the B port are all cut off, at this position, the three-position four-way reversing valve is at the static position, of course, the P port can be connected with the T port, and the working oil ports A and B are cut off. Since the oil flow from the hydraulic pump outlet is returned to the oil return tank, this working position is called hydraulic pump unloading or hydraulic pump bypass. In the hydraulic pump unloading condition, the working pressure is only the resistance loss of the three-position four-way reversing valve, which does not cause the system to heat. When the pipe supporting device is retracted, the valve core of the three-position four-way valve 60 is at the third position, the A port is connected with the T port for return, and the P port supplies oil to the B port. In the embodiment, the three-position four-way valve is not improved, but only used. After the pipe supporting device uses the three-position four-way valve, the switching of the working state of the whole system can be completed by the controller sending a command to the three-position four-way valve to switch the oil supply of the hydraulic oil circuit.

[0050] Embodiment 3

[0051] In addition to the features of the foregoing embodiments, the embodiment further comprises a control system (not shown in the drawings) which is in electrical signal or wireless communication with the hydraulic drive part and can control the start and stop of the hydraulic drive part. The controller is provided with a driver which is connected with the jacking hydraulic cylinder 50 through a high-pressure oil pipe, and the driver is used to drive the jacking hydraulic cylinder 50 to jack up the deformed or collapsed plastic pipe and restore the deformed or collapsed plastic pipe. In the embodiment, the driver is selected as a hydraulic station.

[0052] Embodiment 4

[0053] In addition to the features of the foregoing embodiments, the lower support assembly 10 further comprises a fixedly connected lower arc plate 11 and a lower connecting arm 12, and an obtuse angle is formed between the lower arc plate 11 and the lower connecting arm 12, so that in the retracted state, the lower arc plate 11 is closer to the jacking hydraulic cylinder 50, and in the supporting state, the lower arc plate 11 is basically fully attached to the inner wall of the pipe. The curvature of the lower arc plate 11 is adapted to the shape of the inner wall of the pipe, and the lower connecting arm 12 is hinged to the connecting seat 30; the upper support assembly 20 is the same in structure as the lower support assembly 10, and the upper support assembly 20 and the lower support assembly 10 are symmetrically distributed relative to the center line of the pipe repairing supporting device. In addition, the reset hydraulic cylinder (40) is located between the jacking hydraulic cylinder (50) and the connecting seat (30), and the position arrangement of such a hydraulic cylinder not only allows the jacking hydraulic cylinder (50) to select a one-way hydraulic cylinder with as large a jacking force as possible, but also tries to reduce the volume of the whole pipe supporting device to facilitate the construction in the pipe.

[0054] Embodiment 5

[0055] In addition to comprising the features of the preceding embodiments, the present embodiment further comprises:

[0056] A monitoring camera is installed on the connecting seat 30 and can transmit a video signal to the control system.

[0057] In order to provide the operator with the situation inside the plastic pipeline, the repair device is improved, so as to facilitate the operator to accurately deliver the repair device to the deformed or collapsed area, adjust the position of the jacking structure of the repair device, and accurately judge the repair degree of the plastic pipeline. The repair device further comprises a monitoring camera (not shown in the figure) installed on the connecting seat 30, and a display screen (not shown in the figure) is arranged on the control system, and the display screen is used to display the image of the deformed or collapsed plastic pipeline captured by the monitoring camera.

[0058] In the present application, the terms "first", "second", "third" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integral connection; "connecting" can be direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0060] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe support apparatus, characterised in that, The pipeline support device comprises: a lower support assembly (10) for supporting the inner wall of the pipeline downward, and an upper support assembly (20) for supporting the inner wall of the pipeline upward, wherein the lower support assembly (10) and the upper support assembly (20) are hingedly connected to a connecting base (30); the lower support assembly (10) further comprises: a fixedly connected lower arc plate (11) and a lower connecting arm (12), wherein the lower arc plate (11) is arc-shaped and adapted to the shape of the inner wall of the pipeline, and the lower connecting arm (12) is hingedly connected to the connecting base (30); the upper support assembly (20) is identical in structure to the lower support assembly (10), and the upper support assembly (20) and the lower support assembly (10) are symmetrically distributed relative to the center line of the support device for pipeline repair; a jacking hydraulic cylinder (50) is hingedly connected to the lower support assembly (10) and the upper support assembly (20) at both ends thereof, and the jacking hydraulic cylinder (50) is capable of jacking along the radial direction of the pipeline; a resetting hydraulic cylinder (40) is hingedly connected to the lower support assembly (10) and the upper support assembly (20) at both ends thereof, and is capable of providing a resetting pulling force along the radial direction of the pipeline when the pipeline support device is retracted; a hydraulic drive unit (70) is connected to the jacking hydraulic cylinder (50) and the resetting hydraulic cylinder (40) through high-pressure oil pipes; wherein an obtuse angle is formed between the lower arc plate and the lower connecting arm, in the retracted state, the lower arc plate is closer to the jacking hydraulic cylinder, and in the supporting state, the lower arc plate is in close contact with the inner wall of the pipeline.

2. The pipe support apparatus of claim 1, wherein, Further comprising: a three-position four-way valve (60) having a P port, a T port, an A port and a B port, wherein: the P port is connected to the hydraulic drive unit (70); the T port is an oil return port and is in communication with an oil return tank; the A port is connected to the inner cavity (52) of the jacking hydraulic cylinder (50); the B port is connected to the rod cavity oil port (42) of the resetting hydraulic cylinder (40); when the jacking hydraulic cylinder (50) is jacked, the valve core of the three-position four-way valve (60) is in the first position, the P port supplies oil to the A port, and the B port is connected to the T port for return flow; in the second position, the valve core of the three-position four-way valve (60) is in the cut-off position, and the P port, the T port, the A port and the B port are all cut off; when the pipeline support device is retracted, the valve core of the three-position four-way valve (60) is in the third position, the A port is connected to the T port for return flow, and the P port supplies oil to the B port.

3. The pipe support apparatus of claim 1, wherein, Further comprising: a control system in electrical signal or wireless communication with the hydraulic drive unit and capable of controlling the start and stop of the hydraulic drive unit.

4. The pipeline support device according to claim 1, wherein: the resetting hydraulic cylinder (40) is located between the jacking hydraulic cylinder (50) and the connecting base (30).

5. The pipe support apparatus of claim 1, wherein, Further comprising: a monitoring camera mounted on the connecting base and capable of transmitting video signals to the control system.

6. A control method for controlling the pipeline support device according to any one of claims 1-5, comprising: S1, cleaning the inside of the pipeline to be repaired, selecting the nearest inspection well from the pipeline defect position, and putting the pipeline support device into the pipeline through the inspection well and using a traction mechanism to move the pipeline support device; S2, after being pulled to the pipeline defect position, the jacking hydraulic cylinder (50) is jacked along the radial direction of the pipeline, and the upper support assembly (20) and the lower support assembly (10) support the pipeline defect position; S3, repairing the pipeline defect. S4, the hydraulic drive part (70) supplies oil to the rod cavity of the reset hydraulic cylinder (40), the reset hydraulic cylinder applies a restoring tension along the pipeline radial direction, and the pipeline support device is retracted; S5, the traction mechanism moves out the pipeline support device.

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