Device and method for installing an inner sleeve inside a pipe

Abstract

The application discloses a device and method for installing an inner sleeve in a pipeline, and the device for installing the inner sleeve in the pipeline comprises a limiting device for limiting the inner sleeve from being retracted, the limiting device comprises at least three self-locking pulleys for being fixed on the outer periphery of the inner sleeve at intervals in the circumferential direction; a blocking device for being blocked at the two ends of an outer pipe; a pipe end sealing waterproof device for sealing the two end portions of the inner sleeve; and a water level control device for injecting water into the inner portion of the outer pipe and into a starting well. The device utilizes water buoyancy to lift the inner sleeve as a whole, and solves the technical problems that the axis position is prone to change when the inner sleeve is installed in a pipeline with a relatively long length, and the device cannot be recycled. The device utilizes water as a buffer medium between the inner and outer pipe walls, effectively reduces the frictional resistance in the construction process, and can meet the construction of an inner sleeve with a super-long distance.

Description

Device and method for installing inner sleeves inside pipelines Technical Field

[0001] This invention relates to the field of pipe jacking engineering technology, and in particular to a device and method for installing an inner sleeve inside a pipeline. Background Technology

[0002] Pipe jacking is a trenchless construction method for long-distance underground pipelines. This technology has been widely used in the construction of underground pipelines and tunnels for gas, heating, electricity, water supply, and drainage. When pipelines need to cross structures such as highways and railways, steel sleeves are usually installed inside the pipe jacking system to ensure pipeline safety. Depending on the contact method between the steel sleeve and the outer pipeline, existing sleeve construction methods can be divided into the bamboo veneer method and the steel pulley bracket method.

[0003] The bamboo veneer method, a relatively traditional approach, first requires constructing a medium-coarse sand or plain concrete foundation inside the casing. Then, long bamboo strips are evenly bound around the outside of the casing along its length, ensuring a secure hold. This protects the anti-corrosion layer of the outer casing during the inner casing's insertion. After the steel pipe is inserted, the bamboo strips, along with the steel pipe, are firmly secured within the casing, reducing dismantling time. However, with increasing inner casing length and diameter, the friction increases significantly, raising the risk of damage to the casing's anti-corrosion layer. The bamboo veneer method also makes it difficult to control the casing's axial position, and significant deformation occurs at the bottom of the casing as the pipe diameter increases. The steel pulley bracket method is another traditional approach. First, steel brackets need to be designed and fabricated based on the parameters of the inner and outer pipes. During casing construction, the starting end of the casing is placed on the steel bracket and inserted into the jacking pipe, where the steel pipe is pulled or pushed forward. The appropriate number of steel brackets is then set according to calculations until construction is complete. Because it is difficult to remove, the steel bracket is often left inside during the gap filling construction. Therefore, the steel bracket is often left inside and the steel pipe stabilization work is carried out directly.

[0004] Although builders have proposed many improvements to the traditional pipe-laying process, such as using rubber wheels instead of steel pulleys to protect the outer pipe structure and welding pulleys to the outer pipe wall instead of steel supports to prevent deflection, the existing solutions are no longer sufficient to meet the needs of actual projects as pipe diameters and lengths continue to increase. Summary of the Invention

[0005] To address the shortcomings of the prior art, the present invention provides a device and method for installing an inner sleeve inside a pipe, which solves the technical problems of easy deviation of the axial position and inability to recycle the device when installing an inner sleeve inside a long or large-diameter pipe.

[0006] In a first aspect, the present invention discloses a device for installing an inner sleeve inside a pipe, and a limiting device for restricting the retraction of the inner sleeve, the limiting device including at least three self-locking pulleys for being fixed circumferentially at intervals on the outer periphery of the inner sleeve.

[0007] A sealing device for sealing both ends of an outer pipe, comprising a starting well outer pipe sealing device and a receiving well outer pipe sealing device. The starting well outer pipe sealing device has an opening for the inner casing to pass through and a water inlet for injecting water into the outer pipe. The top surface of the starting well outer pipe sealing device is flush with the height of the preset maximum water level line inside the outer pipe, and the receiving well outer pipe sealing device is higher than the height of the preset maximum water level line inside the outer pipe.

[0008] A pipe end sealing and waterproofing device used to seal both ends of the inner sleeve;

[0009] A water level control device for injecting water into a starting well includes a water level measuring element, a water pump, a pumping pipe connected to the water pump and a water source, an injection pipe, and a controller connected to the water level measuring element and the water pump for controlling the water level.

[0010] A further improvement of the device for installing an inner sleeve inside a pipeline according to the present invention is that the water level measuring element includes a maximum level gauge for monitoring the highest water level of the launching well and a minimum level gauge for monitoring the lowest water level of the launching well, wherein the elevation of the minimum level gauge is lower than the bottom elevation when the inner sleeve is jacked in.

[0011] A further improvement of the device for installing an inner sleeve inside the pipe of the present invention is that the water level control device further includes a water storage tank for fixing inside the launching well, the water pump is fixed on the water storage tank, the water pump is connected in series with the water pump and the water storage tank, and the water pump is located below the lowest liquid level gauge, and the water injection pipe is connected to the water storage tank.

[0012] A further improvement of the device for installing an inner sleeve inside the pipe of the present invention is that the water injection pipe is located at the lower part of the water storage tank, and a valve is provided on the water injection pipe, which is connected to the controller.

[0013] A further improvement of the device for installing an inner sleeve inside a pipe according to the present invention is that the height of the self-locking pulley is greater than the gap between the outer pipe and the inner sleeve. The self-locking pulley includes a fixed support for fixing on the circumferential surface of the inner sleeve, a movable wheel, an ear plate assembly rotatably connected to the fixed support and the movable wheel, and an elastic member for fixing between the circumferential surface of the inner sleeve and the ear plate. The elastic member is located on the side closer to the starting well.

[0014] A further improvement of the device for installing an inner sleeve inside a pipe according to the present invention is that the pipe end sealing and waterproofing device includes a waterproof membrane for covering the end of the inner sleeve and extending out of the outer periphery of the inner sleeve, and a pressure cable for being fitted onto the inner sleeve and clamped to the outer periphery of the waterproof membrane.

[0015] Secondly, the present invention also provides a method for installing an inner sleeve inside a pipe using the device described above, comprising the following steps:

[0016] The two ends of the first inner sleeve to be installed are sealed by the pipe end sealing waterproof device;

[0017] Install a starting well external pipe sealing device at the external pipe opening of the starting well;

[0018] Push the inner section of the first sleeve into the outer tube;

[0019] At least three self-locking pulleys are fixed at circumferential intervals along the outer periphery of the first inner sleeve inside the outer tube;

[0020] Install a sealing device for the outer pipe of the receiving well at the outer pipe opening;

[0021] Water is injected into the outer pipe through the water inlet. When the water level inside the outer pipe is higher than the starting well sealing device, the water inside the outer pipe will flow out into the starting well, and the injection of water into the outer pipe will stop.

[0022] The water level control device controls the injection pipe to inject water into the starting well, and at the same time monitors the highest water level in the starting well through the water level measuring device. When the water level in the starting well reaches the preset highest water level, the water injection stops.

[0023] Continue jacking the first pipe section until only the tail end of the first pipe section is in the launching shaft, then stop jacking;

[0024] The controller is used to control the water pump to pump water out of the starting well through the pumping pipe. At the same time, the water level measuring device monitors the lowest water level in the starting well. When the water level in the starting well is lower than the bottom elevation when the inner casing is jacked up, the pumping stops.

[0025] By restricting the retraction of the inner sleeve with at least three self-locking pulleys, the pipe end sealing and waterproofing device at the tail end of the first inner sleeve is removed, the tail end of the second inner sleeve is sealed with the pipe end sealing and waterproofing device, and the head end of the second inner sleeve is connected to the tail end of the first inner sleeve.

[0026] The controller controls the injection pipe to inject water into the launching well, and the water level in the launching well is monitored by the water level measuring device until the water level in the launching well reaches the preset maximum water level.

[0027] Continue pushing in the second inner sleeve, and so on, until all inner sleeves have been pushed in;

[0028] Remove all self-locking pulleys and pipe end sealing and waterproofing devices installed inside the pipe, drain the water in the starting well, and replace the water inside the outer pipe with gap-filling material.

[0029] A further improvement of the method for installing an inner sleeve inside a pipe according to the present invention is that the water level control device further includes a water storage tank for fixing in the starting well, the water pump is fixed on the water storage tank, the water pump is connected in series with the water pump and the water storage tank, and the water pump is located below the lowest liquid level gauge, and the water injection pipe is connected to the water storage tank.

[0030] Before injecting water into the launching well through the water injection pipe controlled by the controller, water is injected into the storage tank to the highest water level, and then water is injected into the launching well to the lowest water level.

[0031] When water is injected into the starting well through the water injection pipe controlled by the controller, the water in the water storage tank is injected into the starting well through the water injection pipe;

[0032] When the controller controls the water pump to draw water from the starting well through the pumping pipe, the water in the starting well is pumped into the storage tank through the pumping pipe.

[0033] A further improvement of the method for installing an inner sleeve inside a pipe according to the present invention is that the water injection pipe is located at the lower part of the water storage tank, and a valve is provided on the water injection pipe, which is connected to the controller;

[0034] When water is injected into the starting well through the injection pipe controlled by the controller, the opening of the valve is controlled by the controller.

[0035] When the water level in the starting well reaches the preset maximum water level, the valve is closed by the controller.

[0036] A further improvement of the method for installing an inner sleeve inside a pipe according to the present invention is that the height of the self-locking pulley is greater than the gap between the outer pipe and the inner sleeve, and the self-locking pulley includes a fixed support, a movable wheel, an ear plate assembly rotatably connected to the fixed support and the movable wheel, and an elastic element.

[0037] When at least three self-locking pulleys are fixed at circumferential intervals on the outer periphery of the first section of the inner casing inside the outer casing, the fixed support is fixed on the circumferential surface of the inner casing, the elastic element is fixed between the circumferential surface of the inner casing and the ear plate, and the elastic element is located on the side closer to the starting well.

[0038] During the jacking of the inner casing, the moving wheel deviates towards the side closer to the starting well, and the elastic element is in a compressed state.

[0039] When the inner casing is restricted from retraction by at least three of the self-locking pulleys, the movable wheel is restricted from moving toward the originating well side by the elastic force of the elastic element.

[0040] Compared with existing technologies, the advantages of this invention are positive and significant. This invention utilizes water buoyancy to lift the inner sleeve as a whole, and the device can also be disassembled and recycled, solving the technical problems of easy change in the axial position and the inability to recycle the device when installing inner sleeves inside long pipelines in existing technologies. This invention uses water as a buffer medium between the inner and outer pipe walls, effectively reducing frictional resistance during construction, enabling the construction of ultra-long-distance inner sleeves, effectively protecting the anti-corrosion layer of the outer wall of the inner sleeve, having no requirements for the inner wall of the outer pipe, and having a wider range of applications. It uses water buoyancy and a limiting device to precisely control the center position of the inner sleeve, and restricts the retraction of the inner sleeve during the extension process. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 is a schematic diagram of the overall structure of the device for installing an inner sleeve inside a pipe according to the present invention.

[0043] Figure 2 is a schematic diagram of the intelligent water level control system of the device for installing an inner sleeve inside the pipeline according to the present invention.

[0044] Figure 3 is a schematic diagram of the structure of the starting well outer pipe sealing device of the device for installing an inner sleeve inside the pipeline according to the present invention.

[0045] Figure 4 is a schematic diagram of the receiving well outer pipe sealing device of the device for installing an inner sleeve inside the pipeline according to the present invention.

[0046] Figure 5 is a schematic diagram of the overall structure of the limiting device of the device for installing an inner sleeve inside a pipe according to the present invention.

[0047] Figure 6 is a schematic diagram of the self-locking pulley of the device for installing an inner sleeve inside the pipe according to the present invention when the inner sleeve is in the connecting state.

[0048] Figure 7 is a schematic diagram of the self-locking pulley of the device for installing an inner sleeve inside a pipe according to the present invention when the inner sleeve is in a free state.

[0049] Figure 8 is a schematic diagram of the calculation of the preset maximum water level height in the method of installing an inner sleeve inside the pipeline according to the present invention. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] As shown in Figures 1 to 4, the present invention provides a device for installing an inner sleeve 4 inside a pipe, and a limiting device for restricting the retraction of the inner sleeve 4. The limiting device includes at least three self-locking pulleys 5 for fixing at intervals along the outer periphery of the inner sleeve 4 in the circumferential direction.

[0052] A sealing device for sealing both ends of the outer pipe 3. The sealing device includes a starting well outer pipe sealing device 8 and a receiving well outer pipe sealing device 18. The starting well outer pipe sealing device 8 has an opening for the inner casing 4 to pass through and a water injection port for injecting water into the outer pipe 3. The top surface of the starting well outer pipe sealing device 8 is flush with the height of the preset highest water level line inside the outer pipe 3. The receiving well outer pipe sealing device 18 is higher than the height of the preset highest water level line inside the outer pipe 3.

[0053] A pipe end sealing and waterproofing device used to seal both ends of the inner sleeve 4;

[0054] A water level control device for injecting water into the starting well 1 includes a water level measuring element, a water pump 10, a pumping pipe connected to the water pump 10 and a water source, an injection pipe, and a controller connected to the water level measuring element and the water pump 10 for controlling the water level. This device is suitable for different pipe diameters and can be reused, enhancing the applicability of this method. The intelligent water level control structure matched to this method provides working conditions for welding the casing and accurately controls the casing elevation. Furthermore, water resources are readily available, operation is simple, and it can be replaced and recycled, replacing steel pulley brackets and bamboo strips, resulting in high economic benefits.

[0055] Specifically, as shown in Figures 3 and 4, the size of the outer pipe sealing device 8 of the launching well needs to be determined by parameters such as the diameter of the outer pipe 3 and the inner pipe, their relative positions, and the water level. It is usually formed by welding and cutting steel and is firmly connected to the outer pipe 3. The outer pipe sealing device 18 of the receiving well needs to be higher than the water level. It can be formed by welding and splicing steel plates, or masonry wall sealing can be considered. The outer pipe sealing device 18 of the receiving well is arc-shaped.

[0056] The calculation method for the preset maximum water level height is as follows:

[0057] Assumption: The centers of the outer tube 3 and the inner tube are located on the same plumb line.

[0058] Given: The inner sleeve 4 has a material density of ρ1, a thickness of t, and an outer diameter of R.o The distance between the inner sleeve 4 and the bottom of the outer sleeve 3 is h0, the density of water is ρ0, and the gravitational acceleration constant is g.

[0059] Solution: During the construction of inner sleeve 4, what is the liquid level height h? w As shown in Figure 8.

[0060] Assuming θ∈(0, π / 2) in the diagram, and based on geometric relationships, θ and h... w There is a unique correspondence:

[0061]

[0062] According to Archimedes' principle, G 管 =F 浮 ,in

[0063]

[0064] Substituting the formula into the equation yields...

[0065]

[0066] By combining equations (1) and (3), the unique solution for the liquid level height h can be obtained. w The liquid level height h w This refers to the height of the external pipe sealing device 8 at the starting well.

[0067] Preferably, as shown in Figures 1 and 2, the water level measuring device includes a maximum level gauge 6 for monitoring the highest water level in the launching well 1 and a minimum level gauge 7 for monitoring the lowest water level in the launching well 1. The elevation of the minimum level gauge 7 is lower than the bottom elevation of the inner casing 4 during jacking. The maximum level gauge 6 is flush with the top surface of the outer casing sealing device 8 in the launching well. The maximum level gauge 6 corresponds to the highest water level in the launching well 1, and the minimum level gauge 7 corresponds to the lowest water level in the launching well 1. Further, a support rail 11 for supporting and elevating the inner casing 4 is provided in the launching well 1. The structure of the support rail 11 is the same as that of the steel rail in the prior art, and the elevation of the minimum level gauge 7 is lower than the top elevation of the support rail 11. The starting well 1 is fixed with a backrest 14 on one side relative to the outer casing 3. Multiple jacks 13 are fixed on the backrest 14. A top iron 12 is fixed to the end of the jack 13 away from the backrest 14. The inner casing 4 is pressed against the top iron 12 on the side opposite to the jack 13. The inner casing 4 is pushed in by the extension of the jack 13. When it is necessary to connect the pipe, the jack 13 is retracted to leave enough space for the next section of inner casing 4 to be lowered and to complete the positioning, welding, and flaw detection operations.

[0068] Preferably, as shown in Figure 2, the water level control device further includes a water storage tank 9 fixed inside the launching well 1, a water pump 10 fixed to the water storage tank 9, a pumping pipe connected in series between the pump 10 and the water storage tank 9, and the pumping pipe being below the lowest level gauge 7. The injection pipe is connected to the water storage tank 9. The controller, the highest level gauge 6, the lowest level gauge 7, the water storage tank 9, the pump 10, the pumping pipe, and the injection pipe together constitute an intelligent water level control system. The pump 10 is fixed at the top of the water storage tank 9. By setting up the water storage tank 9, the water in the launching well 1 can be reused, avoiding water waste and reducing the cost of long-distance pumping and drainage. The lowest water level 17 of the water storage tank should be higher than the elevation of the highest level gauge 6, that is, also higher than the elevation of the launching well external pipe sealing device 8, to ensure that the water in the water storage tank 9 can be smoothly discharged into the launching well 1. The highest water level in the water storage tank 9 should be lower than the elevation of the water storage tank 9.

[0069] Preferably, the water injection pipe is located at the lower part of the water storage tank 9, and a valve 16 is provided on the water injection pipe, which is connected to the controller. During use, the water injection pipe can be retained or not retained, and only the valve 16 is provided, depending on actual needs. The valve 16 is located near the bottom of the water storage tank 9. To improve drainage efficiency, two or more valves 16 can also be provided.

[0070] Preferably, as shown in Figures 5-7, the height of the self-locking pulley 5 is greater than the gap between the outer tube 3 and the inner sleeve 4. The self-locking pulley 5 includes a fixed support 501 for fixing to the circumferential surface of the inner sleeve 4, a movable wheel 502, an ear plate 504 assembly rotatably connected to the fixed support 501 and the movable wheel 502, and an elastic element 503 for fixing between the circumferential surface of the inner sleeve 4 and the ear plate 504. The elastic element 503 is located on the side closer to the starting well 1. In this embodiment, the elastic element 503 is a spring. There are two ear plates 504, and each ear plate 504 has a first opening at both ends. The fixed support 501 is flat and thicker than the moving wheel 502, and has a second opening. The two ear plates 504 are sandwiched between the two sides of the fixed support 501, and are rotatably connected to the fixed support 501 by a first rotating shaft passing through the first and second openings respectively. The two ear plates 504 are also sandwiched between the two sides of the moving wheel 502, and are rotatably connected to the moving wheel 502 by a second rotating shaft passing through the first and second openings respectively. The axes of the first and second rotating shafts are both perpendicular to the axis of the outer tube 3. In this embodiment, the limiting device consists of three self-locking pulleys 5, which are evenly distributed around the circumference of the sleeve, with an included angle of 120 degrees between adjacent self-locking pulleys 5, as shown in Figure 5. The even distribution of the three self-locking pulleys 5 around the circumference ensures that the positioning can still be maintained after the pipe is twisted. The caster wheel 502 is made of rubber to reduce damage to the inner wall of the outer tube 3.

[0071] Preferably, the pipe end sealing and waterproofing device includes a waterproof membrane for covering the end of the inner sleeve and extending beyond the outer periphery of the inner sleeve, and a pressure cable for fitting onto the inner sleeve and clamping around the outer periphery of the waterproof membrane. In this embodiment, the waterproof membrane is a waterproof plastic membrane, and the pressure cable is a ring-shaped stainless steel pressure cable. In use, the waterproof plastic membrane is first wrapped around the end of the sleeve, and then the stainless steel pressure cable is used to tightly attach it to the sleeve. This device is lightweight, easy to construct, has strong adaptability to different diameters, and has good sealing performance. After the inner sleeve 4 is completely jacked in, the pipe end sealing and waterproofing device is removed.

[0072] On the other hand, as shown in Figures 1-4, the present invention also provides a method for installing an inner sleeve inside a pipe using the device described above, comprising the following steps: sealing both ends of the first inner sleeve 4 to be installed using a pipe end sealing and waterproofing device; installing a starting well outer pipe sealing device 8 at the opening of the outer pipe 3 of the starting well 1; pushing a portion of the first inner sleeve 4 into the outer pipe 3; fixing at least three self-locking pulleys 5 at circumferential intervals around the outer periphery of the first inner sleeve 4 inside the outer pipe 3; and fixing the outer pipe 3 of the receiving well 2 at the opening of the receiving well 2. Install the receiving well outer pipe sealing device 18; inject water into the outer pipe 3 through the water inlet; when the water level inside the outer pipe 3 is higher than the sealing device of the starting well 1, the water inside the outer pipe 3 will flow out into the starting well 1, and the injection of water into the outer pipe 3 will stop; control the water injection pipe to inject water into the starting well 1 through the controller of the water level control device, and monitor the highest water level in the starting well 1 through the water level measuring device; when the water level in the starting well 1 reaches the preset highest water level, stop the injection; continue to push the first pipe section until only When the tail end of the first pipe section is located at the starting well 1, the jacking is stopped; the controller controls the water pump 10 to pump water out of the starting well 1 through the pumping pipe, and at the same time, the water level in the starting well 1 is monitored by the water level measuring device. When the water level in the starting well 1 is lower than the bottom elevation when the inner casing 4 was jacked, the pumping is stopped; the retraction of the inner casing 4 is restricted by at least three self-locking pulleys 5, the pipe end sealing and waterproofing device at the tail end of the first inner casing 4 is removed, and the tail end of the second inner casing 4 is sealed and waterproofed. The device is sealed, and the head end of the second inner sleeve 4 is connected to the tail end of the first inner sleeve 4. Water is injected into the launching well 1 through the water injection pipe controlled by the controller, and the water level in the launching well 1 is monitored by the water level measuring device until the water level in the launching well 1 reaches the preset maximum water level. The second inner sleeve 4 is pushed in, and so on, until all inner sleeves 4 are pushed in. The device for installing the inner sleeve 4 inside the pipe is removed, the water in the launching well 1 is drained, and the water inside the outer pipe 3 is replaced by filling gap material.

[0073] Preferably, as shown in Figures 1 and 2, the water level measuring device includes a maximum level gauge 6 for monitoring the highest water level and a minimum level gauge 7 for monitoring the lowest water level. The elevation of the minimum level gauge 7 is lower than the bottom elevation when the inner casing 4 is jacked up. The maximum level gauge 6 and the minimum level gauge 7 are used to monitor the water level in the starting well 1 in real time.

[0074] Preferably, the water level control device further includes a water storage tank 9 fixed in the launching well 1, a water pump 10 fixed to the water storage tank 9, a water pump pipe connected in series between the water pump 10 and the water storage tank 9, and the water pump pipe being below the lowest level gauge 7; the water injection pipe is connected to the water storage tank 9; before injecting water into the launching well 1 by controlling the water injection pipe through the controller, water is injected into the water storage tank 9 to the highest water level, and water is injected into the launching well 1 to the lowest water level; when injecting water into the launching well 1 by controlling the water injection pipe through the controller, the water in the water storage tank 9 is injected into the launching well 1 through the water injection pipe; when the water pump 10 is controlled by the controller to pump water out of the launching well 1 through the water pump pipe, the water in the launching well 1 is pumped into the water storage tank 9 through the water pump pipe.

[0075] Specifically, during the jacking process of the inner casing 4, the water level in the starting well 1 is mainly controlled by the highest liquid level gauge 6. When the water level reaches the highest water level in the starting well 1, the water pump 10 is turned on and the water in the starting well 1 is injected into the water storage tank 9 through the pumping pipe. When the water level is lower than the highest water level in the well, the valve 16 is opened and water is injected into the well from the water storage tank 9.

[0076] During the casing connection process, the water level in the starting well 1 is mainly controlled by the lowest level gauge 7. When the water level reaches the lowest water level in the starting well 1, the water pump 10 is turned on and the water in the starting well 1 is injected into the water storage tank 9 through the pumping pipe. When the water level is lower than the lowest water level in the starting well 1, the valve 16 is opened and water is injected into the well from the water storage tank 9.

[0077] When switching from the jacking state to the pipe-connecting state, the water pump 10 operates and the valve 16 closes; when switching from the pipe-connecting state to the jacking state, the water pump 10 closes and the valve 16 opens.

[0078] Preferably, the water injection pipe is located at the lower part of the water storage tank 9, and the water injection pipe is equipped with a valve 16, which is connected to the controller; when the water injection pipe is controlled by the controller to inject water into the starting well 1, the valve 16 is opened by the controller; when the water level in the starting well 1 reaches the preset maximum water level, the valve 16 is closed by the controller.

[0079] Preferably, as shown in Figures 5-7, the height of the self-locking pulley 5 is greater than the gap between the outer tube 3 and the inner sleeve 4. The self-locking pulley 5 includes a fixed support 501, a movable wheel 502, an ear plate 504 rotatably connected to the fixed support 501 and the movable wheel 502, and an elastic element 503. When at least three self-locking pulleys 5 are fixed at circumferential intervals on the outer periphery of the first section of the inner sleeve 4 inside the outer tube 3, the fixed support 501 is fixed to the circumferential surface of the inner sleeve 4. The elastic element 503 is fixed between the circumferential surface of the inner casing 4 and the ear plate 504, and the elastic element 503 is positioned on the side closer to the starting well 1. During the jacking process of the inner casing 4, the moving wheel 502 is biased towards the side closer to the starting well 1, and the elastic element 503 is in a compressed state. When the inner casing 4 is restricted from retraction by at least three self-locking pulleys 5, the moving wheel 502 is restricted from moving towards the starting well 1 by the elastic force of the elastic element 503.

[0080] Specifically, as shown in Figure 6, the self-locking pulley 5 is in operation during the casing construction process. The fixed support 501 is welded to the outer wall of the inner casing 4, the moving wheel 502 is in contact with the inner wall of the outer pipe 3, and the spring is in a compressed state. As shown in Figure 7, when the inner casing 4 is being connected to the pipe, the jacking force of the rear jack 13 is removed, and the inner casing 4 may retract under the action of water waves. At this time, the self-locking pulley 5, under the action of the spring force, prevents the pulley from rolling back, thereby limiting the retraction of the inner casing 4.

[0081] This method utilizes water buoyancy to install sleeves inside pipes. The process is specifically divided into the following seven stages:

[0082] Phase 1: After completing the preparatory work for pipe laying, calculate the water level inside the pipe using the water level line height calculation method, and install the external pipe sealing device 8 and intelligent water level control system on the side of the launching well 1. Adjust the height of the guide rail 11 of the support inside the launching well 1, and adjust the parameters of the jacking iron 12, jack 13, and backrest 14 to adapt to the casing jacking construction. Fill the outer pipe 3, launching well 1, and water tank 9 with water to the designated minimum water level elevation.

[0083] Phase 2: Install pipe end sealing and waterproofing devices on both ends of the first inner sleeve 4 on the ground and mount them on the support guide rail 11. First, push the first pipe section a certain distance into the pipeline. Workers enter from the receiving well 2 side, or first from the launching well 1 before pushing. Weld a sleeve limiting device to the head of the inner sleeve 4. After the workers withdraw, use the receiving well outer pipe sealing device 18 to seal the opening on the receiving well 2 side, ensuring the height exceeds the water level inside the outer pipe 3. Then, inject water into the outer pipe 3 and the launching well 1 until the highest water level is reached, at which point the water levels in the outer pipe 3 and the launching well 1 are the same.

[0084] Phase 3: The highest level gauge 6 shuts off the intelligent water level control device and sets it to jacking mode. Slowly push jack 13 to insert the inner sleeve 4 into the pipe. Simultaneously, install the pipe end sealing and waterproofing device at the tail of the next section of inner sleeve 4 on the ground.

[0085] Phase 4: Once the inner casing 4 is in place, switch the intelligent water level control device to the connection state and control the water pump 10 to pump the water in the launching well 1 back to the storage tank 9, starting to lower the water level in the launching well 1 until the water level drops to the lowest water level in the launching well 1. At this point, the lowest level gauge 7 shuts off the intelligent water level control device. Slowly retract the top iron 12 and the jack 13. At this time, the limit device ensures that the casing does not retract.

[0086] Phase 5: The next inner casing section 4 is hoisted into the launching well 1 to complete positioning, welding, and flaw detection operations.

[0087] Phase 6: Switch the intelligent water level control device to jacking mode, open valve 16 until the water level rises to the highest water level in the launching well 1. Begin the jacking operation of the inner casing 4.

[0088] Phase 7: Repeat the steps of Phases 3 to 6 above until the inner casing 4 is completed. Drain the water in the starting well 1 and replace the water in the outer casing 3 with gap-filling material to complete the final construction.

[0089] This invention utilizes water buoyancy to lift the inner sleeve as a whole. The device can also be disassembled and recycled, solving the technical problems of easy change in the axial position and the inability to recycle the device when installing inner sleeves inside long pipelines in existing technologies. This invention uses water as a buffer medium between the inner and outer pipe walls, effectively reducing frictional resistance during construction. It can meet the requirements for ultra-long-distance inner sleeve construction, effectively protecting the anti-corrosion layer of the outer wall of the inner sleeve, without requiring specific protection for the inner wall of the outer pipe, thus broadening its applicability. It uses water buoyancy and a limiting device to precisely control the center position of the inner sleeve and restricts its retraction during the extension process.

[0090] All parts not described in this invention are the same as or can be implemented using existing technologies. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, shall still fall within the scope of the present invention.

Claims

1. A method for installing an inner sleeve inside a pipeline, characterized in that, An apparatus for installing an inner sleeve inside a pipeline includes: a limiting device for restricting the retraction of the inner sleeve, the limiting device including at least three self-locking pulleys for circumferentially spaced and fixed to the outer circumference of the inner sleeve; a sealing device for sealing both ends of the outer pipe, the sealing device including a starting well outer pipe sealing device and a receiving well outer pipe sealing device, the starting well outer pipe sealing device having an opening for the inner sleeve to pass through and a water inlet for injecting water into the outer pipe, the top surface of the starting well outer pipe sealing device being flush with the height of a preset maximum water level line inside the outer pipe, and the receiving well outer pipe sealing device being higher than the height of the preset maximum water level line inside the outer pipe; and a pipe end sealing and waterproofing device for sealing both ends of the inner sleeve. A water level control device for injecting water into the launching well, the water level control device including a water level measuring element, a water pump, a pumping pipe connected to the water pump and a water source, an injection pipe, and a controller connected to the water level measuring element and the water pump for controlling the water level; the height of the self-locking pulley is greater than the gap between the outer pipe and the inner sleeve, the self-locking pulley includes a fixed support for fixing on the circumferential surface of the inner sleeve, a movable wheel, an ear plate assembly rotatably connected to the fixed support and the movable wheel, and an elastic element for fixing on the circumferential surface of the inner sleeve and the ear plate, the elastic element being located on the side closer to the launching well; the method for installing the inner sleeve inside the pipeline includes the following steps: sealing both ends of the first section of the inner sleeve to be installed with a pipe end sealing waterproof device. The process involves: sealing the outer pipe of the launching well; installing an outer pipe sealing device at the outer pipe opening of the launching well; pushing part of the first inner casing section into the outer pipe; fixing at least three self-locking pulleys at circumferential intervals around the outer periphery of the first inner casing section inside the outer pipe; installing an outer pipe sealing device at the outer pipe opening of the receiving well; injecting water into the outer pipe through the injection port; stopping water injection into the outer pipe when the water level inside the outer pipe is higher than the launching well sealing device; controlling the injection pipe to inject water into the launching well through the controller of the water level control device, while monitoring the highest water level in the launching well through the water level measuring device; stopping water injection when the water level in the launching well reaches the preset highest water level; continuing to push the first inner casing section into the launching well until only the tail end of the first inner casing section is in the launching well, then stopping the process. The process involves: jacking in the inner casing; using the controller to control a water pump to remove water from the starting well via a pumping pipe, while simultaneously monitoring the lowest water level in the starting well using a water level measuring device; stopping pumping when the water level in the starting well is lower than the bottom elevation at which the inner casing was jacked in; restricting the retraction of the inner casing using at least three self-locking pulleys; removing the pipe end sealing and waterproofing device from the tail end of the first inner casing section; sealing the tail end of the second inner casing section using the pipe end sealing and waterproofing device; connecting the head end of the second inner casing section to the tail end of the first inner casing section; injecting water into the starting well using the injection pipe controlled by the controller, while simultaneously monitoring the water level in the starting well using a water level measuring device, until the water level in the starting well reaches the preset maximum water level; continuing to jack in the second inner casing section, and so on, until all inner casing sections are jacked in;Remove all self-locking pulleys and pipe end sealing and waterproofing devices installed inside the outer pipe, drain the water from the launching well, and replace the water inside the outer pipe with gap-filling material.

2. The method for installing an inner sleeve inside a pipeline according to claim 1, characterized in that, The water level control device also includes a water storage tank fixed inside the launching well, a water pump fixed to the water storage tank, a pumping pipe connected in series between the water pump and the water storage tank, and the pumping pipe being below the lowest level gauge. The injection pipe is connected to the water storage tank. Before injecting water into the launching well through the injection pipe controlled by the controller, water is injected into the water storage tank to the highest water level, and then into the launching well to the lowest water level. When injecting water into the launching well through the injection pipe controlled by the controller, water from the water storage tank is injected into the launching well through the injection pipe. When the water pump is controlled by the controller to pump water out of the launching well through the pumping pipe, water from the launching well is pumped into the water storage tank through the pumping pipe.

3. The method for installing an inner sleeve inside a pipeline according to claim 2, characterized in that, The water injection pipe is located at the lower part of the water storage tank, and a valve is provided on the water injection pipe. The valve is connected to the controller. When the water injection pipe is controlled by the controller to inject water into the launching well, the valve is opened by the controller. When the water level in the launching well reaches the preset maximum water level, the valve is closed by the controller.

4. The method for installing an inner sleeve inside a pipeline according to claim 1, characterized in that, The height of the self-locking pulley is greater than the gap between the outer tube and the inner casing. The self-locking pulley includes a fixed support, a movable wheel, an ear plate assembly rotatably connected to the fixed support and the movable wheel, and an elastic element. When at least three self-locking pulleys are fixed circumferentially at intervals along the outer periphery of the first section of the inner casing inside the outer tube, the fixed support is fixed on the circumferential surface of the inner casing, and the elastic element is fixed between the circumferential surface of the inner casing and the ear plate, with the elastic element positioned on the side closer to the starting well. During the jacking process of the inner casing, the movable wheel is biased towards the side closer to the starting well, and the elastic element is in a compressed state. When the inner casing is restricted from retraction by at least three self-locking pulleys, the movable wheel is restricted from moving towards the starting well side under the elastic force of the elastic element.

5. The method for installing an inner sleeve inside a pipeline according to claim 1, characterized in that, The water level measuring device includes a maximum level gauge for monitoring the highest water level in the launching well and a minimum level gauge for monitoring the lowest water level in the launching well. The elevation of the minimum level gauge is lower than the bottom elevation when the inner casing is jacked up.

6. The method for installing an inner sleeve inside a pipeline according to claim 1, characterized in that, The pipe end sealing and waterproofing device includes a waterproof membrane for covering the end of the inner sleeve and extending out of the outer periphery of the inner sleeve, and a pressure cable for being fitted onto the inner sleeve and clamped around the outer periphery of the waterproof membrane.

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