A settling observation protection sleeve

Abstract

The application provides a settlement observation protection sleeve, which comprises a sleeve body, an end cover and a heating device; the sleeve body is composed of an outer pipe wall and an inner pipe wall, and a closed annular chamber is formed between the two; the inner pipe wall surrounds to form a first central passage; the end cover is located at one end of the sleeve body, and a second central passage is arranged in the center, and the two are connected to form a central passage for inserting a settlement observation tube; the annular chamber is provided with a heating device for heating the soil and the filler around the sleeve body in a low-temperature environment. The application effectively inhibits the frost heaving phenomenon, prevents the jacking and displacement of the settlement observation tube, and guarantees the accuracy and stability of the observation data; meanwhile, the device has good sealing performance, effectively avoids the infiltration of external moisture, helps to maintain the internal temperature balance, and meets the long-term observation demand in cold regions.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering monitoring technology, and in particular to a settlement observation protective sleeve. Background Technology

[0002] In geotechnical engineering projects such as dams and embankments, structural settlement and deformation are key indicators for assessing the stability and safety of the project. To achieve continuous monitoring of the dam's settlement process, settlement monitoring tubes are typically installed during the construction phase. By arranging magnetic rings, optical fibers, or liquid sensors inside the tubes, settlement data at different depths can be acquired, thereby enabling layered tracking and dynamic monitoring of the dam's internal deformation.

[0003] To ensure observation accuracy and prevent damage to the observation system from construction disturbances or soil displacement, settlement observation tubes are typically equipped with protective sleeves. For example, a settlement observation tube protection device disclosed in patent application CN214702220U protects the tube by using an outer sleeve and a protective tube that are coaxially aligned and combined with a double-locking anti-loosening structure. This method of adding a protective sleeve not only provides structural support and isolation from external forces but also helps improve the system's service life and data stability. However, in cold regions or winter environments, existing protective sleeves often fail to perform their intended function and affect the continuity and flexibility of settlement observation operations.

[0004] Therefore, how to ensure the normal operation of settlement monitoring work in low-temperature environments has become an urgent problem to be solved. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a settlement observation protective sleeve to solve or partially solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides a settlement monitoring protective sleeve, comprising:

[0007] The sleeve body includes an outer tube wall and an inner tube wall connected to each other, and an annular cavity is formed between the outer tube wall and the inner tube wall; the inner tube wall forms a first central channel.

[0008] An end cap is provided at one end of the sleeve body, and a second central channel is provided in the middle of the sleeve body; the first central channel and the second central channel are connected to form a central channel for inserting a settlement observation tube; there is a filling space between the settlement observation tube and the inner tube wall for filling with filler material;

[0009] A heating device, located within the annular cavity, is used to heat the soil and fill material surrounding the sleeve body at low temperatures.

[0010] Optionally, at least one guiding device is provided in the first central channel, the guiding device is disposed on the inner tube wall, and the settlement observation tube passes through the guiding device.

[0011] Optionally, the guiding device includes an inner ring and an outer ring, which are fixedly connected by a connector;

[0012] The outer ring is fixedly embedded in the inner wall of the inner tube; the settlement observation tube passes through the inner ring axially, and an annular gap is formed between the outer wall of the settlement observation tube and the inner wall of the inner ring.

[0013] Optionally, a plurality of the connectors are arranged circumferentially along the outer wall of the inner ring, with one end connected to the outer wall of the inner ring and the other end connected to the inner wall of the outer ring; a space is formed between two adjacent connectors, so that the inner ring and the outer ring form a hollow ring structure.

[0014] Optionally, the inner wall of the inner tube is provided with an inwardly recessed annular mounting groove, and the outer ring of the guide device is fixed in the annular mounting groove, with the inner wall of the outer ring and the inner wall of the inner tube on the same arc surface.

[0015] Optionally, the end cover is provided with a terminal block and a wiring winding; the terminal block is located on the outside of the end cover, and the wiring winding is located inside the end cover, with one end of the wiring winding connected to the terminal block and the other end electrically connected to the heating device.

[0016] Optionally, the end cap is further provided with a plurality of circumferentially evenly distributed pull-out rings on the side away from the sleeve body; each pull-out ring is installed on the surface of the end cap by a fixed connection structure, the fixed connection structure including but not limited to a welding structure, a threaded connection structure or an integrally formed structure.

[0017] Optionally, the inner diameters of the first central channel and the second central channel are the same; when the end cap is provided at one end of the sleeve body, the first central channel and the second central channel are axially connected to form the central channel with the same diameter and through structure.

[0018] Optionally, the heating device includes a heating coil, which is spirally wound around the outer periphery of the inner tube wall and extends axially along the inner tube wall.

[0019] Optionally, the outer periphery of the inner tube wall is provided with a spiral coil groove; the heating coil is embedded in the spiral coil groove.

[0020] As described above, the settlement observation protective sleeve provided by this utility model includes a sleeve body, an end cap, and a heating device. The sleeve body comprises an outer tube wall and an inner tube wall, which enclose a closed annular chamber. The heating device is located within the annular chamber. Furthermore, the end cap is located at one end of the sleeve body, with a second central channel at its center. The inner tube wall encloses a first central channel, which connects with the second central channel to form a central channel through which the settlement observation tube can be inserted. This application, by installing a heating device within the annular chamber, can heat the soil and filling material around the sleeve body in low-temperature environments, effectively suppressing the impact of frost heave on the lifting and displacement of the settlement observation tube, ensuring the stability and accuracy of the observation data. Moreover, the overall sealing is good, preventing external moisture infiltration and helping to maintain the temperature balance of the device, adapting to the long-term observation needs in cold regions. The through-type design of the central channel facilitates the precise insertion and stable fixation of the settlement observation tube, improving construction convenience and observation reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a traditional protective sleeve.

[0023] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0024] Figure 3 This is a partial structural cross-sectional diagram of an embodiment of the present utility model;

[0025] Figure 4 This is an exploded view of the structure of an embodiment of the present utility model;

[0026] Figure 5 This is a cross-sectional view of an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Sleeve body; 11. Outer tube wall; 12. Inner tube wall; 121. Annular mounting groove; 13. Annular chamber; 131. Spiral coil groove; 14. First central channel; 2. End cap; 21. Second central channel; 22. Terminal block; 23. Wiring winding; 3. Heating device; 4. Sealing ring; 5. Guide device; 51. Outer ring; 52. Inner ring; 53. Connector; 6. Pull-out ring; 7. Lifting protrusion; 8. Settlement observation tube. Detailed Implementation

[0029] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be described in detail below with reference to specific embodiments and accompanying drawings.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] As mentioned in the background section, in geotechnical engineering projects such as dams and embankments, structural settlement deformation is one of the important indicators for assessing the stability and safety of the project. In order to achieve dynamic monitoring of the dam settlement process, in engineering practice, settlement observation tubes 8 are often pre-embedded during the construction stage, and magnetic rings, optical fibers or liquid sensing devices are installed inside the tubes to achieve continuous acquisition and layered tracking of settlement data at different depths of the dam. However, the measurement of settlement observation tubes 8 is easily affected by construction disturbance or soil stress.

[0032] To address the aforementioned issues, ensure monitoring accuracy, and prevent damage to the monitoring pipe system from construction disturbances or soil stress, a protective sleeve is typically installed around the settlement monitoring pipe 8. This provides structural support, external force isolation, and system stability. During use, the first settlement monitoring pipe 8 is vertically fixed at a predetermined position, and the protective sleeve is installed on its outer side, ensuring the sleeve can be freely raised and lowered. Then, manufactured sand is added to the annular space formed by the outer wall of the settlement monitoring pipe 8 and the inner wall of the protective sleeve. As the building structure rises, new settlement monitoring pipes 8 are connected section by section, and the protective sleeve is simultaneously raised to the new connection section. During construction, the elevation of the top of the pipe is regularly measured using a level, and settlement data is recorded to maintain unobstructed clearance between the settlement monitoring pipe 8 and the protective sleeve. For the protective sleeve structure, see [link to relevant documentation]. Figure 1The system includes a sleeve body 1 and lifting protrusions 7 symmetrically arranged near its upper edge. The sleeve body 1, which is fitted around the settlement observation tube 8, can effectively isolate the backfill material and soil pressure from directly affecting the settlement observation tube 8, ensuring the overall stability and observation accuracy of the system. In addition, the lifting protrusions 7 are symmetrically arranged near the upper edge of the sleeve body 1. The lifting protrusions 7 are provided with through holes to facilitate the connection of hoisting equipment and realize the lifting operation of the protective sleeve.

[0033] However, the applicant discovered that while installing a protective sleeve around the settlement monitoring pipe 8 resolved the issue of construction disturbance or soil stress damaging the monitoring pipe system, the area around the iron protective sleeve was prone to freezing, leading to frost heave, ice cracks, or low-temperature shrinkage in the surrounding soil. This not only exacerbated the relative displacement between the protective sleeve and the surrounding soil, increasing the risk of structural stress concentration, but also hindered lifting operations, potentially causing pipe jamming, deformation, or even damage, severely impacting the stable operation of the settlement monitoring system and the continuity and reliability of data acquisition. Furthermore, in complex and variable underground environments, the settlement monitoring pipe 8 might experience eccentricity or jamming within the protective sleeve, but currently, the protective sleeve lacks corresponding protective structures to address these issues.

[0034] To address the issues of existing protective sleeves being unable to withstand low-temperature environments and lacking protective structures, the applicant proposes a settlement observation protective sleeve equipped with a heating device 3 and a built-in limiting position. The applicant discovered that the sleeve body 1 can be optimized into a double-layer coaxial pipe wall structure consisting of an inner pipe wall 12 and an outer pipe wall 11, forming an annular chamber 13 between them, in which the heating device 3 is installed. By heating the protective sleeve body, not only can the surrounding backfill material and adjacent soil be locally heated, but frozen areas can also be effectively melted, thus avoiding lifting resistance caused by icing and ensuring smooth lifting operation of the settlement observation protective sleeve in low-temperature environments. Furthermore, a guiding structure is provided in the first central channel 14 of the sleeve body 1. This structure allows for effective guidance and free movement of the settlement observation tube 8 without affecting the dense filling between the manufactured sand and the pipe wall, thus meeting the requirements for settlement transferability and data accuracy in settlement observation and monitoring.

[0035] The following is in conjunction with the appendix Figures 2-5 The embodiments of this application will be described in detail below.

[0036] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a settlement monitoring protective sleeve includes:

[0037] The sleeve body 1 includes an outer tube wall 11 and an inner tube wall 12 connected to each other. An annular cavity 13 is formed between the outer tube wall 11 and the inner tube wall 12. The inner tube wall 12 forms a first central channel 14.

[0038] End cap 2 is located at one end of sleeve body 1, and a second central channel 21 is provided in the middle of the sleeve body 1; the first central channel 14 and the second central channel 21 are connected to form a central channel for inserting settlement observation tube 8; there is a filling space between settlement observation tube 8 and inner tube wall 12 for filling filler material.

[0039] Heating device 3, located in an annular chamber 13, is used to heat the soil and fill material around the sleeve body 1 in a low-temperature environment.

[0040] For example, the sleeve body 1 is further provided with a sealing ring 4, which is located at the end of the sleeve body 1 away from the end cap 2. The outer surface of the sealing ring 4 forms a first interference fit connection with the inner wall surface of the outer tube wall 11, and the inner surface of the sealing ring 4 forms a second interference fit connection with the outer wall surface of the inner tube wall 12. This forms a sealed closed space, namely the cavity 13 of the sealing ring 4, which is enclosed by the outer tube wall 11, the inner tube wall 12, and the end cap 2. During installation, an axial thrust is applied to embed the sealing ring 4 into the annular cavity 13 between the outer tube wall 11 and the inner tube wall 12. The connection is achieved by its elastic deformation and dimensional interference, thereby forming a stable and non-detachable structural interface. In addition, to further enhance the sealing effect, the contact surface between the sealing ring 4 and the sleeve body 1 can be sealed with an internal rubber ring sealing groove (for placing a nitrile rubber ring) and a layer of structural sealant can be applied to ensure that it does not leak or loosen under high humidity and high frost heave pressure.

[0041] For example, the end cap 2 and the sleeve body 1 are connected by an external thread and an internal thread. Specifically, the outer wall of the end cap 2 has an axially downward extending cylindrical connecting section at one end near the sleeve body 1. The internal thread is located on the inner wall of the cylindrical connecting section, and the external thread is located on the corresponding outer surface of the outer tube wall 11 of the sleeve body 1. The two can be screwed together, and after tightening, axial fixation can be achieved, and a preliminary seal is provided by the thread interference and tightening force. This structure places the threaded connection area between the outer tube wall 11 of the sleeve body 1 and the cylindrical connecting section of the end cap 2, effectively preventing the threaded structure from intruding into the central channel area. Moreover, to enhance the sealing performance, an annular groove can be provided at the threaded connection, with an O-ring embedded inside. This O-ring is made of EPDM rubber with temperature resistance and hydrolysis resistance, which can effectively prevent rainwater, mud, or water vapor from seeping into the sleeve. In addition, to ensure long-term burial stability, the sleeve body 1 can be made of corrosion-resistant high-density polyethylene (HDPE) or fiberglass.

[0042] For example, the second central channel 21 and the first central channel 14 formed by the inner wall 12 of the sleeve body 1 are coaxially arranged, with their inner diameters being consistent. The smooth chamfered joint ensures that there is no step jamming when the settlement observation tube 8 is inserted. After the two channels are combined, a complete through structure is formed, allowing the settlement observation tube 8 to extend from the end cap 2 to the full length of the sleeve body 1.

[0043] For example, the heating device 3 can be fixed inside the annular chamber 13 of the sleeve body 1 using a flexible adhesive mounting structure. Optionally, a graphene film or a composite mesh strip of heating wire can be used as the heating element, wrapped or laid flat between the inner surface of the outer tube wall 11 and the outer surface of the inner tube wall 12, and positioned and bonded with high-adhesion thermally conductive silicone or high-temperature resistant structural adhesive to ensure that the element will not shift due to temperature changes or vibration. The power lead of the heating device 3 is led out through the terminal block 22 on the outside of the end cover 2. The hole of the terminal block 22 can be equipped with a waterproof pressure cap nut to ensure the sealing and tensile strength of the cable outlet.

[0044] In this embodiment, the sleeve body 1 includes an outer tube wall 11 and an inner tube wall 12 arranged coaxially. An annular chamber 13 for arranging the heating device 3 is formed between the inner tube wall 12 and the outer tube wall 11. The inner tube wall 12 forms a through first central channel 14. The end cap 2 is installed at one end of the sleeve body 1, and a through second central channel 21 is provided in its center, which is coaxially connected with the first central channel 14. The heating device 3 is arranged inside the annular chamber 13, which is a closed chamber.

[0045] During the pre-embedding operation of the settlement observation tube 8, the settlement observation tube 8 is inserted through the second central channel 21 of the end cap 2, forming an annular filling space between its outer wall and the inner tube wall 12. This space is used to fill the space with manufactured sand material. After the manufactured sand material is added, the settlement observation tube 8 can be stably placed in the central channel of the sleeve body 1.

[0046] In low-temperature environments, to ensure the smooth lifting of the settlement observation protective sleeve, the heating device 3 in the annular chamber 13 is powered on and begins operation. The heating device 3 generates heat, which is first conducted and accumulated within the annular chamber 13, and then further diffused to the surrounding soil and filling material outside the annular chamber 13 through the thermal conductivity of the outer pipe wall 11 and the inner pipe wall 12. This effectively alleviates or inhibits the displacement and deformation of the observation tube caused by frost heave, creating favorable conditions for the lifting operation of the protective sleeve.

[0047] The settlement observation protective sleeve in this embodiment includes a sleeve body 1, an end cap 2, and a heating device 3. The sleeve body 1 includes an outer tube wall 11 and an inner tube wall 12, which enclose a closed annular chamber 13. The heating device 3 is disposed within the annular chamber 13. In addition, the end cap 2 is located at one end of the sleeve body 1, and a second central channel 21 is provided at its center. The inner tube wall 12 encloses a first central channel 14, which is connected to the second central channel 21 to form a central channel through which the settlement observation tube 8 can be inserted.

[0048] This application, by setting a heating device 3 in the annular chamber 13, can heat the soil and filling material around the sleeve body 1 in a low-temperature environment, effectively suppressing the impact of frost heave on the jacking and displacement of the settlement observation tube 8, and ensuring the stability and accuracy of the observation data; moreover, the overall sealing is good, preventing external moisture from seeping in, which helps to maintain the temperature balance of the device and adapt to the long-term observation needs in cold regions; the through design of the central channel facilitates the precise insertion and stable fixation of the settlement observation tube 8, improving the convenience of construction and the reliability of observation.

[0049] In some embodiments, such as Figure 4 and Figure 5 As shown, at least one guide device 5 is provided in the first central channel 14. The guide device 5 is set on the inner pipe wall 12, and the settlement observation pipe 8 passes through the guide device 5.

[0050] For example, the first central channel 14 is a hollow structure, and at least one guide device 5 is provided inside it. The guide device 5 is arranged at intervals along the axial direction of the channel and is fixedly installed on the inner wall 12 of the first central channel 14. The guide device 5 is used to limit the settlement observation tube 8 at multiple points, thereby ensuring that the observation tube remains axially continuous and stably positioned within the first central channel 14.

[0051] For example, each guide device 5 is fixed to the inner wall 12 of the first central channel 14 by a threaded connection or welding to ensure that the guide device 5 does not shift under pipeline operation or vibration conditions. The settlement observation tube 8 passes through the limiting hole of each guide device 5. The inner diameter of the limiting hole of the guide device 5 is slightly larger than the outer diameter of the settlement observation tube 8, forming an annular gap structure, so that the settlement observation tube 8 can settle naturally along the soil and fill material in the axial direction.

[0052] For example, the structure of the guide device 5 can be a cross support structure, an elastic ring clamp structure, or a guide ring structure with an elastic bushing. The outer ring of the ring body fits against the pipe wall, and the inner ring hole is adapted to the settlement observation pipe 8. A flexible material pad for buffering and guiding can be provided in some areas to effectively reduce the risk of abrasion or jamming caused by vibration or settlement and maintain the axial unobstructedness of the settlement observation pipe 8.

[0053] For example, the material of the guide device 5 should preferably be an engineering plastic (such as POM, PA) or stainless steel with corrosion resistance and wear resistance.

[0054] In this embodiment, at least one guide device 5 is provided on the inner wall of the first central channel 14 to guide and position the settlement observation tube 8, ensuring that the settlement observation tube 8 passes through the guide device 5 and extends stably along the first central channel 14. By setting up the guide device 5, the axial displacement of the settlement observation tube 8 within the channel can be effectively limited, ensuring that it remains in the central position during installation and use. Furthermore, it maintains the axial unobstructed flow of the settlement observation tube 8, thereby improving the stability of settlement monitoring and the accuracy of data acquisition.

[0055] In some embodiments, such as Figure 4 and Figure 5 As shown, the guide device 5 includes an inner ring 52 and an outer ring 51, which are fixedly connected by a connector 53.

[0056] The outer ring 51 is fixedly embedded in the inner wall of the inner tube 12; the settlement observation tube 8 passes through the inner ring 52 axially, and an annular gap is formed between the outer wall of the settlement observation tube 8 and the inner wall of the inner ring 52.

[0057] For example, the outer ring 51 is an annular component whose outer diameter matches the inner wall 12 of the first central channel 14. It is embedded in the inner wall of the channel using an interference fit and can be further fixed with positioning adhesive or screws to ensure that the outer ring 51 is stable and does not rotate or slip in the channel. The inner ring 52 is a coaxial circular structure and is firmly connected to the outer ring 51 by connecting parts 53 such as screws, welding, or clips, forming a reliable rigid or semi-rigid fixed connection structure. The settlement observation tube 8 passes through the central through hole of the inner ring 52 along the axial direction. The inner diameter of the inner ring 52 is slightly larger than the outer diameter of the settlement observation tube 8, forming an annular gap between them. While maintaining the limiting function, it allows the settlement observation tube 8 to settle naturally upward with the soil and filling material.

[0058] For example, the outer wall of the outer ring 51 may be designed with anti-rotation ridges, positioning protrusions, or beveled wedge structures to enhance its fixing effect with the inner wall. The inner ring 52 may have a flexible bushing or sliding guide layer on its inner wall to reduce friction between the settlement observation tube 8 and the inner ring 52, thereby improving guiding performance and service life. The connector 53 may adopt a screw-and-nut structure or a molded insert structure to adapt to different manufacturing process requirements.

[0059] For example, the outer ring 51 is made of a metal material (such as aluminum alloy or stainless steel) to enhance structural strength; the inner ring 52 is made of a low-friction, wear-resistant material (such as polyoxymethylene (POM) or polytetrafluoroethylene (PTFE).

[0060] In this embodiment, the outer ring 51 of the guide device 5 is fixedly embedded in the inner tube wall 12 of the first central channel 14 to provide rigid support. At the same time, the settlement observation tube 8 passes through the inner ring 52 axially and forms an annular gap with the inner wall of the inner ring 52. This achieves effective positioning and flexible constraint of the settlement observation tube 8. While ensuring its axially stable layout, the reserved annular gap can also prevent slight displacement from causing jamming, thereby improving the reliability and structural adaptability of settlement monitoring.

[0061] In some embodiments, such as Figure 4 and Figure 5 As shown, multiple connectors 53 are arranged circumferentially along the outer wall of the inner ring 52, with one end connected to the outer wall of the inner ring 52 and the other end connected to the inner wall of the outer ring 51; a space is formed between two adjacent connectors 53, so that the inner ring 52 and the outer ring 51 form a hollow ring structure.

[0062] For example, the outer ring 51 is embedded in the inner wall 12 of the first central channel 14 to form a fixed load-bearing structure, and its inner wall is connected to the outer ends of multiple connectors 53; the outer wall of the inner ring 52 is connected to the inner ends of each connector 53, thereby constructing a stable spatial frame between the two rings. The connectors 53 can be fixed with screws, riveted, snap-fitted, or integrally injection molded to achieve connection stability and structural integrity.

[0063] In addition, the discontinuity between two adjacent connectors 53 forms multiple hollow gap areas, which not only reduces the structural weight but also lowers material costs. At the same time, it facilitates the flow of filler material inside the guide device 5 without creating obstacles.

[0064] For example, the outer wall of the inner ring 52 is provided with several connecting grooves or protrusions to improve the installation accuracy and strength of the connector 53; the inner wall of the outer ring 51 is provided with corresponding grooves, holes or insertion holes to accommodate the outer end of the connector 53. At the same time, the inner diameter of the inner ring 52 is slightly larger than the outer diameter of the settlement observation tube 8, maintaining an axial annular gap between the two to ensure the guidance and free sliding of the settlement observation tube 8 when it passes through.

[0065] In this embodiment, multiple connectors 53 are arranged circumferentially along the outer wall of the inner ring 52 in the guide device 5. Each connector 53 is connected at one end to the outer wall of the inner ring 52 and at the other end to the inner wall of the outer ring 51. This structure allows the inner ring 52 to be stably suspended inside the outer ring 51, thereby achieving effective support and guidance for the settlement observation tube 8. In addition, the space between two adjacent connectors 53 forms a hollow annular structure between the inner ring 52 and the outer ring 51, which helps to reduce the overall weight of the guide device 5, reduce the additional load on the pipeline structure, improve the ventilation and drainage efficiency in the central channel, and facilitate the flow of filler material inside the guide device 5 without forming obstacles.

[0066] In some embodiments, such as Figure 4 and Figure 5 As shown, the inner wall of the inner tube wall 12 is provided with an inwardly recessed annular mounting groove 121, and the outer ring 51 of the guide device 5 is fixed in the annular mounting groove 121. The inner wall of the outer ring 51 and the inner wall of the inner tube wall 12 are on the same arc surface.

[0067] For example, an annular mounting groove 121 is formed on the inner wall of the first central channel 14, and its depth is the same as the thickness of the outer ring 51, thereby ensuring that the outer ring 51 does not protrude from the inner tube wall 12 after being fully embedded. Specifically, the outer ring 51 is pressed into the mounting groove by an interference fit, or a combination of structural adhesive and limiting bosses is used to enhance the fixing effect; at the same time, transverse pins can also be used to prevent the outer ring 51 from undergoing axial or circumferential displacement during use.

[0068] After installation, the inner wall of the outer ring 51 is made to have an arc transition with the edge of the mounting groove opening, so that the guide device 5 as a whole forms a consistent arc profile with the inner wall of the central channel, maintaining the smoothness of the channel inside the pipe, which is beneficial to the stability of the flow field and the guidance stability.

[0069] For example, the cross-section of the annular mounting groove 121 can be rectangular, trapezoidal, or an inverted groove shape with a limiting edge, wherein the inverted structure can significantly improve the pull-out resistance of the outer ring 51. Annular reinforcing ribs or elastic locking tooth structures can be provided on the outer wall of the outer ring 51, which, together with the positioning protrusions or friction structures inside the mounting groove, achieve self-locking and anti-loosening.

[0070] In this embodiment, an inwardly recessed annular mounting groove 121 is provided on the inner wall of the inner pipe wall 12. The outer ring 51 of the guide device 5 is fixedly embedded in the mounting groove, so as to realize the stable fitting of the guide device 5 with the pipe structure, and enhance the overall structural strength and seismic performance. At the same time, the inner wall of the outer ring 51 and the inner wall of the inner pipe wall 12 are on the same arc surface, so that the guide device 5 and the inner wall of the channel transition smoothly, avoiding the formation of local protrusions or steps, which helps to maintain the fluid continuity and cleanliness in the channel.

[0071] In some embodiments, such as Figure 4 and Figure 5 As shown, the end cover 2 is provided with a terminal block 22 and a wiring winding 23; the terminal block 22 is located on the outside of the end cover 2, and the wiring winding 23 is located inside the end cover 2. One end of the wiring winding 23 is connected to the terminal block 22, and the other end is electrically connected to the heating device 3.

[0072] For example, the terminal block 22 is fixedly installed on the outer surface of the end cover 2 by screws, and has several electrode terminals or cable connectors for easy connection of external cables. The wiring winding 23 is arranged in the internal space of the end cover 2, and is made of insulated copper wire or flexible braided wire, and is arranged in a coiled or bundled manner. One end is led out to connect to the electrode terminal of the terminal block 22, and the other end is connected to the electrode port of the heating device 3 by welding, screwing or snapping.

[0073] For example, the wiring winding 23 is fixed inside the end cover 2 by an insulating fixing groove, a slot or insulating glue to prevent it from shifting or loosening due to vibration or temperature rise during operation.

[0074] For example, the conductor material of the wiring winding 23 is selected as high-temperature heat-resistant multi-strand copper core conductor, with an outer silicone or fluoroplastic insulation layer to meet high-temperature working conditions (e.g., >150℃); the conductor length is reserved with appropriate margin according to the installation distance between the end cover 2 and the heating device 3. In addition, a protective cover or insulating heat insulation layer can be provided in the area of ​​the wiring winding 23 to avoid the risk of short circuit caused by contact with other metal parts.

[0075] Specifically, the terminal block 22 serves as an external electrical connection interface, plugging into an external power supply cable and connecting to the wires of the wiring winding 23 via its internal conductive terminals. The wiring winding 23 passes through the internal space of the end cover 2 and is guided to the electrodes of the heating device 3 via wires, thus achieving a closed electrical circuit. The end cover 2 provides a rigid support platform and isolates the internal and external electrical connection structures, forming a clear electrical path.

[0076] In this embodiment, the terminal block 22 is located on the outside of the end cover 2 for easy connection to an external power source. The wiring winding 23 is located inside the end cover 2, with one end connected to the terminal block 22 and the other end electrically connected to the heating device 3. This structural arrangement separates the electrical connection components, facilitating quick external wiring while effectively protecting the internal winding from external environmental interference, thus improving the reliability of the electrical connection and the safety and stability of the heating device 3.

[0077] In some embodiments, such as Figure 3 and Figure 4 As shown, the end cap 2 is provided with a plurality of circumferentially evenly distributed pull-out rings 6 on the side away from the sleeve body 1; each pull-out ring 6 is installed on the surface of the end cap 2 by a fixed connection structure, which includes, but is not limited to, a welding structure, a threaded connection structure or an integral molding structure.

[0078] For example, the pull-out ring 6 has a closed circular ring or an open hook-shaped structure, sized for finger insertion or attachment to tools (such as hooks or rings). If a welded structure is used, the weld length at the bottom of the ring must be ≥15mm and the weld height ≥1.5mm to meet the minimum stress bearing requirements. If a screw connection is used, each ring must be equipped with at least two symmetrically arranged screw holes, and anti-loosening washers or thread-locking adhesive can be added to enhance the connection strength.

[0079] For example, the material of the pull-out ring 6 can be high-tensile-strength stainless steel (such as 304 / 316), carbon steel with powder coating, or forged aluminum alloy to ensure structural load-bearing capacity and corrosion resistance; when using a welded structure, the pull-out ring 6 and the end cap 2 body body are required to have high material compatibility, and the heat-affected zone of the welded area should be stress annealed.

[0080] This embodiment features multiple circumferentially evenly distributed pull-out rings 6 on one side of the end cap 2. Each pull-out ring 6 is fixedly connected to the surface of the end cap 2, achieving uniform force distribution on the settlement observation protective sleeve and facilitating the application of tension during lifting operations. Furthermore, the compatibility of multiple fixed connection methods enhances the flexibility of the structural design, allowing for the selection of appropriate installation methods based on the usage environment, thereby strengthening the versatility and structural stability of the end cap 2 assembly.

[0081] In some embodiments, such as Figure 4 and Figure 5 As shown, the inner diameters of the first central channel 14 and the second central channel 21 are the same; when the end cap 2 is located at one end of the sleeve body 1, the first central channel 14 and the second central channel 21 are axially connected to form a central channel with the same diameter and a continuous structure.

[0082] For example, the inner walls of the first central channel 14 and the second central channel 21 are both polished or coated with a wear-resistant layer to improve the conductivity and channel flow performance; in addition, the inner diameter tolerance of the channel is controlled within the range of H7 / h6 to ensure that there are no abrupt changes or steps in the inner diameter after the structure is connected.

[0083] For example, a positioning boss and groove mating mechanism can be provided at the docking point to ensure accurate positioning during assembly.

[0084] In this embodiment, the first central channel 14 and the second central channel 21 have the same inner diameter, ensuring that the two channels have a consistent diameter when connected, which is conducive to the smooth passage of the filler. When the end cap 2 is located at one end of the sleeve body 1, the first central channel 14 and the second central channel 21 are axially connected to form a central channel with a consistent diameter and a continuous structure, thereby avoiding internal steps, misalignment or local shrinkage, effectively reducing the resistance inside the channel, and improving the guiding accuracy and fluid continuity of the system.

[0085] In some embodiments, such as Figure 3 and Figure 5 As shown, the heating device 3 includes a heating coil, which is spirally wound around the outer periphery of the inner tube wall 12 and extends axially along the inner tube wall 12.

[0086] For example, the winding portion of the heating coil is in close contact with the outer periphery of the inner tube wall 12, and the starting end and ending end of the winding are electrically connected to the wiring winding 23 inside the end cover 2, forming a complete closed circuit.

[0087] For example, the heating coil can be kept in stable contact with the inner tube wall 12 by high-temperature adhesive bonding, winding groove embedding, or clamping and pressing structure to ensure heating efficiency and prevent detachment or displacement caused by vibration or thermal expansion during operation.

[0088] In addition, the heating coil can be made of nickel-chromium alloy wire or silver-plated copper wire, which has good resistance heating characteristics and high temperature resistance; thermal grease, ceramic glue or flexible mica layer can be filled between the heating coil and the inner tube wall 12 to enhance the heat conduction performance.

[0089] In this embodiment, the heating coil is spirally wound around the outer periphery of the inner pipe wall 12 and extended along the axial direction of the inner pipe wall 12, so that the heating coil can uniformly cover the entire length of the pipe, effectively improving the continuity and uniformity of the heating area. Through the surrounding heating method, the overall constant temperature control of the medium or components inside the pipe can be achieved, preventing excessive local temperature difference from causing structural deformation or functional abnormality, thereby improving the thermal stability and operational reliability of the system.

[0090] In some embodiments, such as Figure 3 and Figure 5 As shown, a spiral coil groove 131 is provided on the outer periphery of the inner tube wall 12; the heating coil is embedded in the spiral coil groove 131.

[0091] For example, a spiral coil slot 131 is formed on the outer surface of the inner tube wall 12. The slot width and depth are designed to match the diameter of the heating coil, and are usually slightly larger than the wire size by 0.1~0.3mm to ensure smooth and secure installation. The heating coil is laid in a spiral shape along the slot, and its two end leads pass through the coil slot and are led to the wiring winding 23 provided on the end cover 2 to form a closed-loop power supply.

[0092] Specifically, the heating coil is embedded in the spiral coil groove 131 by pressing, snapping, or potting and curing. The bottom of the groove can be provided with positioning steps or chamfered structures as needed to ensure that the heating coil is accurately positioned in the groove and is not easy to fall off.

[0093] In this embodiment, a spiral coil groove 131 is provided on the outer periphery of the inner tube wall 12 to limit the layout path of the heating coil and realize the orderly arrangement of the heating structure. The heating coil is embedded in the spiral coil groove 131, which on the one hand ensures that the heating coil remains stable and does not shift during the heating process, thereby improving the vibration resistance of the structure, and on the other hand makes the heating device 3 fit tightly against the tube wall, improving the heat conduction efficiency, thereby achieving a more uniform and efficient pipe heating effect and enhancing the thermal control performance and service life of the system.

[0094] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the scope of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this invention as described above, which are not provided in the details for the sake of brevity.

[0095] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sedimentation observation protection sleeve, characterized in that, include: The sleeve body includes an outer tube wall and an inner tube wall connected to each other, and an annular cavity is formed between the outer tube wall and the inner tube wall; the inner tube wall forms a first central channel. An end cap is provided at one end of the sleeve body, and a second central channel is provided in the middle of the sleeve body; the first central channel and the second central channel are connected to form a central channel for inserting a settlement observation tube; there is a filling space between the settlement observation tube and the inner tube wall for filling with filler material; A heating device, located within the annular cavity, is used to heat the soil and fill material surrounding the sleeve body at low temperatures.

2. The sedimentation observation protection sleeve according to claim 1, characterized in that At least one guiding device is provided in the first central channel. The guiding device is set on the inner pipe wall, and the settlement observation tube passes through the guiding device.

3. The sedimentation observation protection sleeve according to claim 2, characterized in that The guiding device includes an inner ring and an outer ring, which are fixedly connected by a connector. The outer ring is fixedly embedded in the inner wall of the inner tube; the settlement observation tube passes through the inner ring axially, and an annular gap is formed between the outer wall of the settlement observation tube and the inner wall of the inner ring.

4. The sedimentation observation protection sleeve according to claim 3, characterized in that Multiple connectors are arranged circumferentially along the outer wall of the inner ring, with one end connected to the outer wall of the inner ring and the other end connected to the inner wall of the outer ring; a space is formed between two adjacent connectors, so that the inner ring and the outer ring form a hollow ring structure.

5. The settlement observation protective sleeve according to claim 4, characterized in that, The inner wall of the inner tube is provided with an inwardly recessed annular mounting groove, and the outer ring of the guide device is fixed in the annular mounting groove. The inner wall of the outer ring and the inner wall of the inner tube are on the same arc surface.

6. The settlement observation protective sleeve according to claim 1, characterized in that, The end cover is provided with a terminal block and a wiring winding; the terminal block is located on the outside of the end cover, and the wiring winding is located inside the end cover. One end of the wiring winding is connected to the terminal block, and the other end is electrically connected to the heating device.

7. The settlement observation protective sleeve according to claim 6, characterized in that, The end cap is provided with a plurality of circumferentially evenly distributed pull-out rings on the side away from the sleeve body; each pull-out ring is installed on the surface of the end cap by a fixed connection structure, the fixed connection structure including but not limited to a welding structure, a threaded connection structure or an integral molding structure.

8. The settlement observation protective sleeve according to any one of claims 1-7, characterized in that, The first central channel and the second central channel have the same inner diameter; when the end cap is installed at one end of the sleeve body, the first central channel and the second central channel are axially connected to form the central channel with the same diameter and through structure.

9. The settlement observation protective sleeve according to any one of claims 1-7, characterized in that, The heating device includes a heating coil, which is spirally wound around the outer periphery of the inner tube wall and extends axially along the inner tube wall.

10. The settlement observation protective sleeve according to claim 9, characterized in that, The outer circumference of the inner tube wall is provided with a spiral coil groove; the heating coil is embedded in the spiral coil groove.

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