Heat distribution pipeline well wall waterproof device based on sleeve compensation and steel-plastic conversion

Abstract

The invention discloses a heat distribution pipeline well wall waterproof device based on sleeve compensation and steel-plastic conversion, and relates to the technical field of heat distribution pipelines, the heat distribution pipeline well wall waterproof device comprises a sleeve sealing section used for sealing and water blocking, and the sleeve sealing section comprises a steel outer protection pipe and a well wall sleeve; the steel-plastic conversion section is connected with the steel outer protective pipe in a material conversion manner and comprises a PE (Poly Ethylene) outer sheath; and the non-fixed support is used for guiding the steel core tube to be inserted into the steel outer protective tube. According to the heat distribution pipeline well wall waterproof device based on sleeve compensation and steel-plastic conversion, a steel-sleeved-steel heat preservation pipe structure is adopted, the steel outer protection layer and the well wall sleeve are sealed through the double-layer sealing ring, the pressure bearing capacity of the sealing structure is improved, the service life of the sealing structure is prolonged, the pipeline thermal displacement adapting performance of the sealing structure is improved, and adjustment and maintenance are convenient. And meanwhile, through steel-plastic conversion between the steel outer protective pipe and the PE outer protective pipe, conventional connection between the device and the finished thermal insulation pipe with the PE outer protective layer is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal pipelines, and in particular to a thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion. Background Art

[0002] Urban heating systems are becoming increasingly popular and are gradually expanding to southern cities. Direct-buried hot water heating pipes generally use finished insulated pipes consisting of a high-density polyethylene (PE) outer sheath + polyurethane rigid foam plastic insulation layer + steel core pipe, that is, a plastic-sheathed steel structure. The heating temperature is generally around 100°C, and drainage wells and valve wells need to be set up along the hot water heating pipes. When the thermal pipe passes through the wall of the thermal well, it needs to be waterproofed and sealed. If the seal fails, water may enter the well, thereby destroying the insulation structure of the pipe in the well, and due to the hydrolysis of the polyurethane insulation material, it will further penetrate into the entire heating pipeline, causing serious impact on the insulation performance of the heating system and even the heating safety.

[0003] In the prior art, many well chambers are built by installing steel casing on the well wall, passing the thermal insulation pipe through the steel casing, and filling the space between the thermal pipe and the steel casing with asphalt hemp fiber and pressing it tightly, so as to achieve the purpose of waterproof sealing. However, since the thermal pipe will produce axial thermal displacement, as the displacement times increase, its filler will loosen, and then groundwater will enter the well chamber through the gap. This installation method can only be used in well chambers where the secondary network water supply temperature is relatively low and the sealing requirements are not high.

[0004] The well chamber flexible casing commonly used in China is to install a wing ring on the outside of the steel pipe, use a flexible filler to seal between the casing and the pipeline, and achieve sealing by adjusting the fastening bolts to squeeze the sealing filler. This flexible waterproof casing requires that the contact part between the working pipe and the casing is relatively hard to achieve the effect of sealing and waterproofing.

[0005] In actual applications, the entire thermal insulation pipe relies on the supporting filler ring on the waterproof casing to support the insulation pipe, and the compressive strength of polyurethane is only 0.3MPa, which is much smaller than the allowable pressure of the insulation pipe. Moreover, polyurethane will hydrolyze when it comes into contact with water, causing the insulation layer to collapse due to the squeezing of the filler. The flexible waterproof casing will leak water from the insulation layer and the outside of the PE pipe respectively, and the sealing and waterproofing will fail. Summary of the invention

[0006] The purpose of the present invention is to provide a thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion to solve the above-mentioned problems.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a thermal pipeline well wall waterproof device based on sleeve compensation and steel-plastic conversion, including a sleeve sealing section for sealing and blocking water, which includes a steel outer protective pipe and a well wall casing; The steel-plastic conversion section that is connected with the steel outer protective pipe material conversion includes a PE outer sheath; A non-fixed support for guiding the steel core tube to be inserted into the steel outer protective tube, comprising a locking unit and a centering unit; The locking unit comprises arc rods which are arranged to slide relative to each other in a circumferential direction; An elastic member is arranged at the end of the arc rod, and the elastic member has a position that allows the arc rod to be tightly pressed against the steel outer protective tube; The centering unit comprises a centering block which is arranged to slide in the radial direction, and when the steel core tube is pushed and squeezed, the centering block and the arc rod keep moving synchronously.

[0008] Preferably, it also includes a support rod which is radially slidably arranged at the end of the arc rod and extends toward the inner wall of the steel outer protective tube as the arc rod moves.

[0009] Preferably, it further comprises a slide rail, the end of the arc rod is slidably arranged on the slide rail, and a second gear meshing with the support rod is rotatably arranged on the slide rail; The second gear is meshed with the arc rod for transmission.

[0010] Preferably, the device further comprises a rotating member tangent to the steel core tube, and a narrow opening for injecting the foaming liquid is provided on the rotating member, and the narrow opening always points to the steel core tube during the tangent process.

[0011] Preferably, diffusion blades for diffusing the foaming liquid are rotatably provided on both sides of the rotating member.

[0012] Preferably, the rotating member is arranged on the elastic member, and a pressing member for pressing the rotating member is arranged on the elastic member.

[0013] Preferably, a water stop ring is welded on the outside of the well casing, a positioning baffle is welded on the inside, and a fixing flange is welded on the first end of the well casing extending into the inside of the well wall, and a check baffle is welded on the second end opposite thereto.

[0014] Preferably, a mud retaining sealing ring and a double-layer sealing ring are provided in the well wall casing, and the gaps around the double-layer sealing ring are filled with viscoelastic paste.

[0015] Preferably, the steel-plastic conversion section further comprises a heat shrinkable tape and a light-curing sleeve wrapped around the outer wall of the PE outer sheath.

[0016] Preferably, the length of the light-curing sleeve extending into the inner side of the well wall exceeds the end of the positioning baffle by 10 cm, and a viscoelastic tape is wrapped around the outside of the heat shrinkable tape.

[0017] In the above technical scheme, the thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion provided by the present invention has the following beneficial effects: a steel-in-steel thermal insulation pipe structure is adopted, and a double-layer sealing ring is used to seal between the steel outer protective layer and the well wall casing, the purpose of which is to improve the pressure bearing capacity, service life and performance of adapting to thermal displacement of the pipeline of the sealing structure, and facilitate adjustment and maintenance. At the same time, through the steel-plastic conversion between the steel outer protective pipe and the PE outer protective pipe, the conventional connection between the device and the finished thermal insulation pipe with the PE outer protective layer is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the cross-sectional structure of a waterproof device provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional structure diagram of a waterproof device for renovating an old well chamber provided by an embodiment of the present invention; Figure 3 A schematic diagram of the steel outer sheath and steel core tube structure provided in an embodiment of the present invention; Figure 4 A schematic diagram of a non-fixed support structure provided by an embodiment of the present invention; Figure 5 A schematic diagram of the structure of an arc rod and a positioning sleeve provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of the slide rail and the second gear provided in an embodiment of the present invention; Figure 7 A schematic diagram of the structure of the rotating member and the diffusion blade provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of a rotating member provided in an embodiment of the present invention.

[0020] Description of reference numerals: 1. Steel core tube; 2. PE outer sheath; 3. Steel outer protective tube; 4. Insulation layer; 5. Non-fixed support; 51. Positioning sleeve; 52. Centering block; 521. Transmission rack; 53. Arc rod; 54. First gear; 55. Rotating part; 551. Inlet; 552. Side outlet; 553. Turn plate; 554. Diffuser blade; 555. Narrow mouth; 56. Support rod; 561. Reinforcement rib; 59. Slide rail; 591. First Two gears; 592, rotating rod; 593, elastic part; 594, pressure part; 6, fixed support; 7, well casing; 7a, casing inner joint; 7b, casing outer joint; 8, water stop ring; 9, fixing flange; 10, clamping flange; 11, double-layer sealing ring; 12, viscoelastic paste; 13, mud-blocking sealing ring; 14, light-curing sleeve; 15, heat shrink tape; 16, viscoelastic tape; 17, non-return baffle; 18, positioning baffle. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-8 As shown, a thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion includes a steel core pipe 1, including: A sleeve sealing section for sealing and blocking water, which includes a steel outer protective pipe 3 and a well casing 7; A steel-plastic conversion section connected with the steel outer protective pipe 3 for material conversion, comprising a PE outer sheath 2; A non-fixed support 5 for guiding the steel core tube 1 to be inserted into the steel outer protective tube 3, which includes a locking unit and a centering unit; The locking unit comprises arc rods 53 which are arranged to slide relative to each other in the circumferential direction; An elastic member 593 is disposed at the end of the arc rod 53, and the elastic member 593 has a position that allows the arc rod 53 to be tightly pressed against the steel outer protective tube 3; The centering unit comprises a centering block 52 which is radially slidable, and when the steel core tube 1 is pushed and squeezed, the centering block 52 and the arc rod 53 keep moving synchronously.

[0023] Specifically, it also includes a positioning sleeve 51, an arc rod 53 is slidably set in the positioning sleeve 51, and a centering block 52 is slidably set on the positioning sleeve 51, a plurality of teeth are set on the arc rod 53, a first gear 54 that meshes with the teeth and is rotatably set in the positioning sleeve 51, and a transmission rack 521 that meshes with the first gear 54 and is also fixedly set on the centering block 52.

[0024] Furthermore, the non-fixed support 5 is first placed in the steel outer protective tube 3, and then the steel core tube 1 is inserted into the non-fixed support 5. The end of the steel core tube 1 will squeeze the centering block 52, so that the centering block 52 slides radially and approaches the steel outer protective tube 3, and the reaction force of the centering block 52 on the steel core tube 1 guides the steel core tube 1 to always slide axially, avoiding slippage during the insertion of the steel core tube 1. The centering block 52 drives the first gear 54 to rotate through the teeth, and the first gear 54 drives the arc rod 53 to slide along the inner wall of the steel outer protective tube 3 while rotating. Figure 4 As shown, the elastic member 593 is arranged at the end of the two arc rods 53. When the arc rods 53 start to slide, the two arc rods 53 approach each other and squeeze the elastic member 593, so that the elastic member 593 is in the working position, and the elastic force is released on the arc rods 53, so that the arc rods 53 are tightly against the inner wall of the steel outer protective tube 3, and the non-fixed support 5 is locked in the steel outer protective tube 3, so that the friction force during the plug-in process of the steel core tube 1 does not drive the non-fixed support 5 to slide, and the axial displacement of the steel core tube 1 during the assembly process is effectively reduced.

[0025] like Figure 1-2 As shown, a thermal pipeline installation method based on sleeve compensation and steel-plastic conversion includes the following steps: Step 1: Weld the positioning baffle 18 to the inner wall of the well casing 7, and weld the water stop ring 8 to the outer wall of the well casing 7; Step 2: Weld the fixing flange 9 to one end of the well casing 7 located in the well; Step 3: Drill and process the flange ring with the fixed flange 9, and weld it on the steel short pipe to form a clamping flange 10. The outer diameter and wall thickness of the steel short pipe are determined according to the outer diameter of the insulation pipe and the inner diameter of the well casing 7; Step 4: spray anti-corrosion coating on the inner and outer surfaces of the above parts to complete the production of the waterproof device casing assembly; Step 5: Pre-embed and cast the casing assembly of the waterproof device on the well wall; Step 6: insert the mud retaining seal ring 13 into the pipeline assembly, and insert the pipeline assembly into the well casing assembly from the outside of the wellbore, so that the mud retaining seal ring 13 is in place to form an outer mud retaining and water blocking primary seal; Step 7: Insert the double-layer sealing ring 11 into the pipeline assembly layer by layer from the inner side of the well chamber, push it to the position close to the positioning ring 18, and squeeze the viscoelastic paste 12 into the outer side of each layer of sealing ring; Step 8: The clamping flange 10 is connected to the fixing flange 9 by bolts, and the double-layer sealing ring 11 is compressed by adjusting the nut to form a high degree of sealing on the inner side.

[0026] Specifically, the steel core tube 1 is a seamless steel tube, and the outer diameter Φ1 is in accordance with the outer diameter series of common pipelines.

[0027] The PE outer protective pipe 2 is made of a hard high-density polyethylene pipe, and the outer diameter Φ2 is determined according to the thickness of the insulation layer 4.

[0028] The steel outer protective pipe 3 is made of seamless steel pipe, and its outer diameter is the same as that of the PE outer protective pipe Φ2, with a deviation of no more than 2mm.

[0029] The heat-insulating layer 4 is made of polyurethane rigid foam plastic, and the heat-insulating section of the device is foamed as a whole.

[0030] The non-fixed support 5 is used for concentric support between the core tube and the outer protective tube, and is made of multiple pieces of wood or other non-metallic materials evenly distributed in the circumferential direction.

[0031] The fixed support 6 is used for concentric welding and fixing between the core tube and the outer protective tube, and a plurality of steel plates are evenly distributed in the circumferential direction.

[0032] The well casing 7 is used to waterproof the well cavity and support the thermal pipeline. It adopts a welded steel pipe with an inner diameter Φ3 that is coordinated with the outer diameter Φ2 of the steel outer protective pipe, the clamping flange 10 and the double-layer sealing ring 11.

[0033] When pouring the well wall concrete, the main part of the water stop ring 8 is fixed in the concrete pouring template and poured together.

[0034] In the above technology, a steel-in-steel insulation pipe structure is adopted, and a double-layer sealing ring 11 is used to seal between the steel outer protective layer 3 and the well casing 7, the purpose of which is to improve the pressure bearing capacity, service life and performance of the sealing structure to adapt to the thermal displacement of the pipeline, and to facilitate adjustment and maintenance. At the same time, through the steel-plastic conversion between the steel outer protective pipe 3 and the PE outer protective pipe 2, the conventional connection between the device and the finished insulation pipe with the PE outer protective layer is realized.

[0035] As an embodiment further provided by the present invention, it also includes a support rod 56 which is radially slidably disposed at the end of the arc rod 53 and extends toward the inner wall of the steel outer protective tube 3 as the arc rod 53 moves.

[0036] Specifically, a trapezoidal pad is fixedly provided at the end of the support rod 56 facing the steel outer protective tube 3. By providing an oblique sliding groove on the support rod 56, and fixing a protrusion that slides with the sliding groove on the arc rod 53, when the arc rod 53 slides, the protrusion is driven to squeeze the sliding groove, thereby driving the support rod 56 to extend toward the inner wall of the steel outer protective tube 3, or by setting two ends of a cable on the arc rod 53 and the support rod 56, when the arc rod 53 slides, the cable is pulled, thereby driving the support rod 56 to extend toward the inner wall of the steel outer protective tube 3, and the trapezoidal pad at the end of the support rod 56 presses against the steel outer protective tube 3, so that the friction of the non-fixed support 5 is increased, further playing an anti-slip role, and because the support rod 56 is fixedly provided with a reinforcing rib 561, it can support the non-fixed support 5 to remain perpendicular to the inner wall of the steel outer protective tube 3.

[0037] As another embodiment further provided by the present invention, it also includes a slide rail 59, the end of the arc rod 53 is slidably arranged on the slide rail 59, and a second gear 591 that meshes and transmits with the support rod 56 is rotatably arranged on the slide rail 59; The second gear 591 meshes with the arc rod 53 for transmission.

[0038] Specifically, the slide rail 59 is used for the arc rod 53 to slide. When the arc rod 53 slides along the inner wall of the steel outer protective tube 3, it slides relative to the second gear 591, so that the arc rod 53 meshes with the second gear 591 through the teeth on the arc rod 53 and drives the second gear 591 to rotate. The second gear 591 drives the support rod 56 to extend toward the inner wall of the steel outer protective tube 3, so that the arc rod 53, the second gear 591, and the support rod 56 maintain synchronous movement. The support rod 56 automatically extends toward the inner wall of the steel outer protective tube 3 as the steel core tube 1 is inserted, locking the non-fixed support 5.

[0039] As another embodiment further provided by the present invention, it also includes a rotating member 55 tangent to the steel core tube 1, and a narrow opening 555 for injecting foaming liquid is opened on the rotating member 55, and the narrow opening 555 always points to the steel core tube 1 during the tangent process.

[0040] Specifically, the rotating member 55 is rotatably arranged relative to the arc rod 53, and the rotating member 55 is a cam structure. The rotating member 55 is divided into a short axis and a long axis according to the distance from the center of the circle where the rotating shaft is located, and an injection port 551 is opened on the rotating member 55. In the default state, the long axis of the rotating member 55 points to the center of the circle of the steel outer protective tube 3. During the plug-in process of the steel core tube 1, the end of the steel core tube 1 will push the long axis of the rotating member 55, thereby driving the rotating member 55 to deflect, and during the deflection process, the narrow mouth 555 always points to the outer wall of the steel core tube 1 until the side of the long axis is parallel to the outer wall of the steel core tube 1. Since the rotating member 55 is relatively arranged, the steel core tube 1 always remains in a concentric state during the plug-in process, further avoiding deviation. Subsequently, polyurethane is poured into the injection port 551 for overall foaming, and the polyurethane is sprayed onto the outer wall of the steel core tube 1 through the narrow mouth 555, and the outer wall of the steel core tube 1 is preferentially wrapped and foamed. However, conventional pouring methods make it difficult to guide the spraying route of the polyurethane, so that the polyurethane converges to the bottom of the pipe under the action of gravity, resulting in uneven foaming density on the upper and lower outer walls of the pipe, affecting the final thermal insulation effect. The present invention improves the above problem by setting the narrow mouth 555.

[0041] As another embodiment further provided by the present invention, diffusion blades 554 for diffusing the foaming liquid are rotatably provided on both sides of the rotating member 55 .

[0042] Specifically, side outlets 552 are provided on both sides of the rotating member 55, and a rotating plate 553 is provided on the diffusion blade 554, and the rotating plate 553 is located in the inner cavity of the rotating member 55. During the polyurethane infusion process, the infusion pressure will drive the rotating plate 553 to rotate, and because the infusion nozzle is in a jet-like shape, most of the polyurethane will be sprayed from the narrow opening 555, and a small part of the polyurethane will be sprayed from the side outlet 552. When the rotating plate 553 rotates, it drives the diffusion blade 554 to rotate, and the spray range of the polyurethane driven by the diffusion blade 554 is larger, and it is attached to the non-fixed support 5, so that the polyurethane wraps the outer wall of the steel core tube 1 and the non-fixed support 5 at the same time. During the polyurethane foaming process, the non-fixed support 5 is preferentially fixed by the condensed polyurethane to avoid the displacement of the non-fixed support 5 caused by the expansion of the polyurethane during the overall foaming.

[0043] As another embodiment further provided by the present invention, the rotating member 55 is disposed on the elastic member 593 , and a pressing member 594 for pressing the rotating member 55 is disposed on the elastic member 593 .

[0044] Specifically, a rotating rod 592 is rotatably provided at the end of the support rod 56, an elastic member 593 is fixedly provided at the end of the rotating rod 592, and a rotating member 55 is fixedly provided at the middle of the elastic member 593. In the unplugged state, the elastic member 593 is in a contracted state, at which time the pressing member 594 on the elastic member 593 is in close contact with the rotating member 55, so that the rotating member 55 is kept in a state where the long axis points to the center of the steel outer protective tube 3, and the shaking causes the rotating member 55 to shift. During the plugging process of the steel core tube 1, the end of the steel core tube 1 pushes the centering block 52 to extend toward the inner wall of the steel outer protective tube 3, and the centering block 52 drives the first gear 54 to rotate through the teeth, and the first gear 54 drives the arc rod 53 to slide along the inner wall of the steel outer protective tube 3 while rotating. When the arc rod 53 slides along the inner wall of the steel outer protective tube 3, it slides relative to the second gear 591, thereby meshing with the second gear 591 through the teeth on the arc rod 53 and driving the second gear 591 to rotate. The second gear 591 drives the support rod 56 to extend toward the inner wall of the steel outer protective tube 3. At this time, the distance between the ends of the support rod 56 increases, and drives the rotating rod 592 to rotate, and at the same time stretches the elastic member 593. This is the working position of the elastic member 593. The stretched elastic member 593 drives the pressing member 594 to no longer be close to the rotating member 55. The long axis of the rotating member 55 is pushed by the end of the steel core tube 1, and the rotating member 55 deflects. At the same time, the elastic member 593 twists with the deflection of the rotating member 55, and begins to deform and accumulate force, thereby ensuring that the long axis of the rotating member 55 is always close to the outer wall of the steel core tube 1.

[0045] As another embodiment further provided by the present invention, a water stop ring 8 is welded on the outside of the well wall casing 7, and a positioning baffle 18 is welded on the inside. The well wall casing 7 is welded with a fixing flange 9 at the first end extending into the inner side of the well wall, and a check baffle 17 is welded at the second end opposite thereto.

[0046] Specifically, Figure 1 The state shown, wherein, when the device is used for the reconstruction of the old well chamber, the well wall casing 7 and the water stop ring 8 of the old well chamber can be used, and the casing inner joint 7a and the casing outer joint 7b of the product are only needed to be welded to the two ends of the well wall casing 7 respectively. When the diameter of the well wall casing 7 is inconsistent with 7a and 7b, a large and small head transition can be used to form a complete waterproof casing structure, such as Figure 2 Status shown.

[0047] As another embodiment further provided by the present invention, a mud retaining sealing ring 13 and a double-layer sealing ring 11 are arranged in the well casing 7, and the gaps around the double-layer sealing ring 11 are filled with viscoelastic paste 12.

[0048] Specifically, the double-layer sealing ring 11 is used to prevent groundwater from flowing into the well chamber from the gap between the outer protective pipe of the thermal pipeline and the well casing 7. A new type of sealing material, a flexible graphite ring or an EPDM rubber ring, can be solid or hollow. The gaps around the double-layer sealing ring 11 are filled with a viscoelastic paste 12. The viscoelastic paste 12 and the viscoelastic tape 16 are used for waterproofing and corrosion prevention. They use a viscoelastic polymer with cold flow properties and allow a maximum operating temperature of 70°C. The mud-blocking sealing ring 13 is used to prevent or reduce mud and water outside the well casing 7 from entering the casing. It is in the form of a rubber ring.

[0049] As another embodiment further provided by the present invention, the steel-plastic conversion section also includes a heat shrinkable tape 15 and a light-curing sleeve 14 wrapped around the outer wall of the PE outer sheath 2, and the length of the light-curing sleeve 14 extending into the inner side of the well wall exceeds the end of the positioning baffle 18 by 10 cm, and a viscoelastic tape 16 is wrapped around the outside of the heat shrinkable tape 15.

[0050] Specifically, the light-curing sleeve 14 is used to protect the outer wall of the pipeline, and has the functions of anti-corrosion and anti-friction. It uses a photosensitive polymer composite sheet to wrap around the outer wall of the pipeline, and is cured by ultraviolet light or natural light. It has the characteristics of high hardness, high tensile strength, and good bonding strength with PE and steel. It is widely used in pipeline crossing protection projects. The length of its extension into the inner side of the well wall depends on the position of the positioning baffle 18 on the inner side of the well wall. It usually exceeds the end of the positioning baffle 18 on the inner side of the well wall by 10 cm, forming a smooth sliding surface on the outer surface of the insulation pipe, so that the insulation pipe can move smoothly when axial thermal displacement occurs, and will not be hindered by the friction of the positioning baffle 18. The heat shrinkable belt 15 is used for waterproofing the steel-plastic conversion interface, and a polyethylene or polypropylene heat shrinkable sleeve is used.

[0051] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion, comprising a steel core pipe (1), characterized in that: include: A sleeve sealing section for sealing and water blocking, comprising a steel outer protective pipe (3) and a well casing (7); A steel-plastic conversion section connected with the steel outer protective pipe (3) for material conversion, comprising a PE outer sheath (2); A non-fixed support (5) for guiding the steel core tube (1) to be inserted into the steel outer protective tube (3), comprising a locking unit and a centering unit; The locking unit comprises arc rods (53) which are arranged to slide relative to each other in a circumferential direction; An elastic member (593) is arranged at the end of the arc rod (53), and the elastic member (593) has a position that enables the arc rod (53) to be tightly pressed against the steel outer protective tube (3); The centering unit comprises a centering block (52) which is arranged to slide in a radial direction, and when the steel core tube (1) is pushed and squeezed, the centering block (52) and the arc rod (53) maintain synchronous movement.

2. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 1, characterized in that: It also includes a support rod (56) which is radially slidably arranged at the end of the arc rod (53) and extends toward the inner wall of the steel outer protective tube (3) as the arc rod (53) moves.

3. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 1, characterized in that: It also includes a slide rail (59), on which the end of the arc rod (53) is slidably disposed, and a second gear (591) is rotatably disposed on the slide rail (59) and meshes with the support rod (56). The second gear (591) meshes with the arc rod (53) for transmission.

4. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 1, characterized in that: It also comprises a rotating member (55) tangent to the steel core tube (1), and a narrow opening (55) for injecting foaming liquid is provided on the rotating member (55), and the narrow opening (55) always points to the steel core tube (1) during the tangent process.

5. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 4, characterized in that: Diffusion blades (554) for diffusing the foaming liquid are rotatably arranged on both sides of the rotating member (55).

6. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 5, characterized in that: The rotating member (55) is arranged on the elastic member (593), and a pressing member (594) for pressing the rotating member (55) is arranged on the elastic member (593).

7. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 1, characterized in that: The well casing (7) is welded with a water stop ring (8) on the outside and a positioning baffle (18) on the inside. The well casing (7) is welded with a fixing flange (9) at a first end extending into the inside of the well casing and a non-return baffle (17) at a second end opposite thereto.

8. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 7, characterized in that: A mud retaining sealing ring (13) and a double-layer sealing ring (11) are arranged in the well casing (7), and the gaps around the double-layer sealing ring (11) are filled with a viscoelastic paste (12).

9. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 1, characterized in that: The steel-plastic conversion section also includes a heat shrinkable belt (15) and a light-curing sleeve (14) wound around the outer wall of the PE outer sheath (2).

10. A thermal pipeline well wall waterproofing device based on sleeve compensation and steel-plastic conversion according to claim 9, characterized in that: The length of the light-curing sleeve (14) extending into the inner side of the well wall exceeds the end of the positioning baffle (18) by 10 cm, and the heat shrinkable belt (15) is wrapped with a viscoelastic belt (16).

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