Thermopipe inner lining repair joint connection and pipe mechanical fixing device and method

Abstract

The application discloses a kind of inner lining repair joint connection and pipeline mechanical fixing device and method of heat pipe, it is related to the technical field of fixed connection of inner lining repair joint.The device includes by inside to outside sequentially coaxially fitted sleeve inner lining pipe joint, inner lining repair hose, outer sleeve pipe joint and fastening steel sleeve.The application is suitable for the inner and outer joint mechanical structure of inner lining repair technology of heat pipe, and the flexible use of fastening bolt and fine adjustment compression bolt is cooperated with the flexible use of detachable half circular ring fastening hoop, can meet the installation and fixing of inner lining repair pipeline at joint under different working requirements, improve the reliability of joint connection and the working stability of inner lining repair pipeline in heat pipe inner lining repair engineering.

Description

Technical Field

[0001] This invention relates to the field of fixing and connecting lining repair joints, and more particularly to a device and method for connecting lining repair joints and mechanically fixing pipes in thermal pipelines. Background Technology

[0002] Given that heating pipelines are typically buried underground, excavating the surface to repair the entire pipeline is quite difficult. Currently, most repair techniques are trenchless, targeting specific sections of the heating pipeline where problems have occurred, rather than replacing the entire length of the pipeline. This necessitates addressing the connection issues between the old and new pipelines.

[0003] Chinese invention patent CN113915447A proposes a connecting pipe assembly and a conveying pipe assembly, which achieves the connection of the conveying pipe by adding a locking element. However, this patent only considers how to connect two single-layer pipes. In the technology of thermal pipeline lining repair, in addition to connecting the new and old pipes, it is also necessary to consider how to reasonably and reliably fix the lining repair pipe added during pipeline repair to the new and old pipes in pairs. Chinese utility model patent CN209977560U proposes a tapered joint for lining pipes in trenchless pipeline repair. By installing an outer tapered sleeve of the joint on the outside of the pipe to be repaired and inserting an inner tapered sleeve of the joint into the lining pipe, the connection structure of the compression lining pipe is formed by utilizing its structural taper. This patent can effectively prevent the lining pipe from slipping off the joint during working pressurization. However, when the lining pipe is affected by temperature and undergoes thermal deformation, the connection between the inner tapered sleeve of the joint and the lining pipe may bend and deform. Therefore, it is necessary to design a new pipeline connection method to solve the above-mentioned technical problems of pipeline repair. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems and provide a connection device and method for the repair joint of the inner lining of a thermal pipeline and for mechanically fixing the pipeline.

[0005] The specific technical solution adopted in this invention is as follows:

[0006] In a first aspect, the present invention provides a connection device for the inner lining repair joint of a thermal pipeline and a mechanical fixing device for the pipeline, comprising an inner lining pipe joint, an inner lining repair hose, an outer lining pipe joint and a fastening steel sleeve, which are coaxially fitted together from the inside to the outside.

[0007] The inner lining pipe joint includes an inner lining support and fixing pipe, a flange connecting pipe, a joint connecting flange, and a working pipe connecting flange; the inner lining support and fixing pipe and the flange connecting pipe are coaxially connected as one unit, and the inner wall of the pipe formed by the two is a cylindrical structure. A joint connecting flange is connected to the outer side of the connection between the two in the circumferential direction; an annular sealing and fixing groove is opened in the middle section of the outer wall of the inner lining support and fixing pipe in the circumferential direction, and a working pipe connecting flange is connected to the outer end of the flange connecting pipe; the working pipe connecting flange is used to connect to the flange of the normal thermal working pipe by connecting bolts.

[0008] The inner lining repair hose is a round tube structure, which is sleeved on the outer wall of the inner lining support and fixing tube; one end of the inner lining repair hose is used to extend into the thermal working tube to be repaired and fit against its inner wall, and the other end is fitted and pressed against one side of the joint connection flange.

[0009] The outer tube joint includes an outer joint flange and an outer working tube; the outer working tube is a circular tube structure with outer joint flanges connected to both ends; the outer joint flange at one end is connected to the flange of the thermal working tube to be repaired by connecting bolts, and the outer joint flange at the other end is connected to the joint connecting flange by connecting bolts.

[0010] The fastening steel sleeve is fitted onto the outer wall of the outer working tube located outside the sealing and fixing groove, and is used to fit the inner lining repair hose and the outer tube connector located outside the sealing and fixing groove into the sealing and fixing groove.

[0011] Preferably, the fastening steel sleeve includes a fastening clamp and mounting ears. The two semi-circular fastening clamps are provided with mounting ears at both ends. The mounting ears are provided with fastening connection holes for inserting fastening bolts to achieve installation and fixation. The fastening clamps are provided with several fine-adjusting fastening threaded through holes along the circumference on both sides for inserting fine-adjusting tightening bolts. The fastening clamps are installed on the outside of the sealing and fixing groove, and the bottom curvature of the fastening clamps is the same as the curvature of the sealing and fixing groove.

[0012] Furthermore, the contact side between the fastening clamp and the outer working tube is an arc-shaped structure, and the diameter at the center of the arc-shaped structure is d4 = d 303 +δ1+δ 202 ; where d 303 The outer diameter of the pipe is used to seal and fix the groove, δ1 is the wall thickness of the inner lining repair hose, δ 202 The wall thickness of the outer working tube.

[0013] Furthermore, the fine-tuning fastening threaded through holes on both sides of the fastening clamp are symmetrically distributed.

[0014] Preferably, the outer connector flange is provided with a plurality of first bolt holes along its circumferential direction, and the connector flange and the working pipe flange are provided with a plurality of second bolt holes along their circumferential directions.

[0015] Preferably, the connection between the inner lining support fixing pipe, the flange connecting pipe, the joint connecting flange and the working pipe connecting flange is welding, and the connection between the outer joint flange and the outer working pipe is welding.

[0016] Secondly, the present invention provides a connection and fixing method for connecting the lining repair joint and the mechanical fixing device of the thermal pipeline as described in any of the first aspects, as follows:

[0017] The inner lining repair hose is nested on the outer wall of the inner lining pipe joint, with the inner wall of the inner lining repair hose tightly fitted to the outer wall of the inner lining support and fixing pipe, forming an annular cavity with the sealing and fixing groove; one end of the inner lining repair hose extends into the thermal working pipe to be repaired and fits against its inner wall, while the other end is fitted and pressed against one side of the joint connecting flange; the outer working pipe is nested on the outer wall of the inner lining repair hose, with the outer wall of the inner lining repair hose tightly fitted to the inner wall of the outer working pipe; the outer joint flange at one end of the outer working pipe is connected to the flange of the thermal working pipe to be repaired by connecting bolts, and the outer joint flange at the other end is connected to the joint connecting flange by connecting bolts; the working pipe connecting flange is connected to the flange of the normal thermal working pipe by connecting bolts, completing the initial connection of the inner lining repair joint and the initial fixation of the inner lining repair hose;

[0018] Two fastening clamps of the fastening steel sleeve are assembled on the outside of the outer sleeve joint, with their installation positions corresponding to the sealing and fixing grooves. Fastening bolts are used to connect the mounting ears of the two fastening clamps at the same end, completing the initial fixing of the fastening steel sleeve. The fastening bolts are then symmetrically tightened inwards at both ends of the fastening steel sleeve until there is no gap at the connection point of the two fastening clamps. During this process, the two semi-circular fastening clamps gradually approach each other, and the outer working tube is subjected to circumferential compressive force, causing it to bend inwards along its contact surface with the fastening clamps. Simultaneously, the inner lining repair hose at the same position also undergoes a similar inward bending deformation after being subjected to circumferential compressive force. After the two fastening clamps are fully assembled and fixed, the bending arc of the outer working tube and the inner lining repair hose at the deformed point matches the bottom arc of the fastening clamps. At this point, the inner wall of the inner lining repair hose is tightly fitted with the sealing and fixing groove, completing the further fixing of the inner lining repair hose.

[0019] By screwing in the fine-adjustment threaded through holes on both sides of the fastening clamp, fine-adjustment clamping bolts are symmetrically screwed in to adjust the curvature of the contact surface between the outer working tube and the bottom of the fastening clamp, further pressing the outer working tube and the inner lining repair hose, so that the inner wall of the inner lining repair hose fits more closely with the sealing and fixing groove, completing the mechanical fixing of the inner lining repair hose, and finally achieving the fixed connection of the inner lining repair joint.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] (1) This invention addresses the lining repair technology of thermal pipelines by designing a mechanical structure in which an outer sleeve joint, an inner lining joint, and an inner lining repair hose are nested together, thereby improving the reliability of joint connections in thermal pipeline lining repair projects.

[0022] (2) This invention employs two detachable semi-circular ring-shaped fastening clamps. Through the circumferential tightening and compression characteristics during the complete assembly process, combined with the structural features of the annular cavity formed during the nesting process, and the consistency between the shape of the sealing and fixing groove and the bottom of the clamp, the mechanical fixing of the inner lining repair hose can be effectively achieved. At the same time, by using the fastening bolts on the fastening steel sleeve and the fine-adjusting pressure bolts together, the installation and fixing requirements of the inner lining repair pipe at the joint under different operating conditions can be met.

[0023] (3) The present invention is simple to install, easy to operate, and has low production cost. It can effectively ensure the reliability of joint connection and the working stability of the lining repair pipeline. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the connection structure of a lining repair joint for a thermal pipeline;

[0025] Figure 2 This is an overall schematic diagram showing the connection between the heating pipe to be repaired and the normally functioning heating pipe.

[0026] Figure 3 is a schematic diagram of the mechanical fixation of the lining repair pipe at the joint. (a) is a schematic diagram of the structure when the initial connection and fixation are completed, and (b) is a schematic diagram of the structure after the final fixed connection of the lining repair joint is achieved.

[0027] In the diagram: 1. Inner lining repair hose; 2. Outer lining pipe connector; 3. Inner lining pipe connector; 4. Fastening steel sleeve; 5. Thermal working pipe to be repaired; 6. Normal thermal working pipe. 201. Outer connector flange; 202. Outer working pipe; 203. First bolt connection hole; 301. Connecting flange; 302. Inner lining support fixing pipe; 303. Sealing fixing groove; 304. Second bolt connection hole; 305. Flange connecting pipe; 306. Working pipe connecting flange; 307. Connecting bolt; 401. Fastening clamp; 402. Mounting ear; 403. Fine-tuning fastening threaded through hole; 404. Fastening connection hole; 405. Fastening bolt; 406. Fine-tuning clamping bolt. Detailed Implementation

[0028] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0029] like Figure 1 and 2As shown, this invention provides a connection and mechanical fixing device for the inner lining repair joint of a thermal pipeline. The device mainly includes an inner lining pipe joint 3, an inner lining repair hose 1, an outer sleeve joint 2, and a fastening steel sleeve 4. The inner lining pipe joint 3, the inner lining repair hose 1, the outer sleeve joint 2, and the fastening steel sleeve 4 are coaxially fitted together from the inside to the outside.

[0030] The structure and connection method of each component will be explained in detail below.

[0031] In this invention, the inner lining pipe joint 3 includes an inner lining support and fixing pipe 302, a flange connecting pipe 305, a joint connecting flange 301, and a working pipe connecting flange 306. The inner lining support and fixing pipe 302 and the flange connecting pipe 305 are coaxially connected as a whole, that is, the inner lining support and fixing pipe 302 and the flange connecting pipe 305 are connected end to end to form a straight pipe, and the inner wall of the straight pipe formed by the two has a cylindrical structure. The joint connecting flange 301 extends outward in the circumferential direction at the connection between the inner lining support and fixing pipe 302 and the flange connecting pipe 305. The outer wall of the inner lining support and fixing pipe 302 has an annular sealing and fixing groove 303 with the same depth in the circumferential direction. One end of the flange connecting pipe 305 is connected to the inner lining support and fixing pipe 302, and the other end (i.e., the outer end) is externally connected (i.e., extended outward) to the working pipe connecting flange 306. The working pipe connecting flange 306 is used to connect to the flange at one end of the normal thermal working pipe 6 via connecting bolts 307.

[0032] In a preferred embodiment of the present invention, the connection between the inner lining support fixing pipe 302 and the flange connecting pipe 305 is by welding, the connection between the joint connecting flange 301 and the inner lining support fixing pipe 302 and the flange connecting pipe 305 is by welding, and the connection between the flange connecting pipe 305 and the working pipe connecting flange 306 is by welding.

[0033] In a preferred embodiment of the present invention, the connector flange 301 and the working pipe flange 306 are provided with a plurality of second bolt connection holes 304 along the circumferential direction. By inserting bolts into the second bolt connection holes 304, a detachable connection with the outside can be achieved.

[0034] In this invention, the inner lining repair hose 1 is a straight circular tube structure, which is sleeved on the outer wall of the inner lining support and fixing tube 302. The inner lining repair hose 1 and the inner lining support and fixing tube 302 are fitted together. One end of the inner lining repair hose 1 extends into the thermal working tube 5 to be repaired and fits against its inner wall, while the other end is fitted and pressed against one side of the joint connecting flange 301.

[0035] In this invention, the outer tube connector 2 includes an outer connector flange 201 and an outer working tube 202. The outer working tube 202 is a straight circular tube with outer connector flanges 201 connected to both ends. One end of the outer connector flange 201 is connected to the flange of the thermal working tube 5 to be repaired via connecting bolts 307, and the other end of the outer connector flange 201 is connected to the connector connecting flange 301 via connecting bolts 307.

[0036] In a preferred embodiment of the present invention, the connection between the outer flange 201 and the outer working pipe 202 is by welding. Each outer flange 201 has a plurality of first bolt connection holes 203 machined circumferentially, and a detachable connection with the outside can be achieved by inserting bolts into the first bolt connection holes 203.

[0037] In this invention, the fastening steel sleeve 4 is fitted onto the outer wall of the outer working tube 202 located outside the sealing and fixing groove 303, and is used to fit the inner lining repair hose 1 and the outer tube connector 2 located outside the sealing and fixing groove 303 into the sealing and fixing groove 303.

[0038] In a preferred embodiment of the present invention, the fastening steel sleeve 4 mainly includes a fastening clamp 401 and mounting ears 402. The fastening clamp 401 is semi-circular, and each of the two semi-circular clamps 401 has a protruding mounting ear 402 at both ends. Each of the four mounting ears 402 has a fastening connection hole 404. Fastening bolts 405 are inserted into two fastening connection holes 404 located at the same end to achieve installation and fixation between the two fastening clamps 401. Multiple fine-adjusting fastening threaded through holes 403 are circumferentially formed on the left and right sides of the main body of the fastening clamp 401. Fine-adjusting clamping bolts 406 are inserted into the fine-adjusting fastening threaded through holes 403 to further fix the two fastening connection holes 404. The fastening clamp 401 is installed on the outside of the sealing and fixing groove 303, and the bottom curvature of the fastening clamp 401 is the same as the curvature of the sealing and fixing groove 303. To achieve better fixed installation force distribution, the fine-tuning fastening threaded through holes 403 on both sides of the fastening clamp 401 should be symmetrically distributed.

[0039] In other words, the surface of the fastening steel sleeve 4 is symmetrically machined with several fine-adjustment fastening threaded through holes 403, and the mounting ears 402 at both ends of the fastening clamp 401 must be machined with symmetrical fine-adjustment fastening threaded through holes 403 to ensure that the bottom of the fastening clamp 401 and the bending deformation of the outer working tube 202 at the connection of the fastening steel sleeve 4 can fit tightly.

[0040] Specifically, the contact side between the fastening clamp 401 and the outer working tube 202 has an arc-shaped structure, and the diameter at the center of the arc-shaped structure is d4 = d 303 +δ1+δ 202 Among them, d 303The outer diameter of the pipe in the sealing and fixing groove 303 is δ1, which is the wall thickness of the inner lining repair hose 1. 202 This refers to the wall thickness of the outer working pipe 202. In other words, when the two semi-circular fastening clamps 401 are fully assembled, the diameter of the steel sleeve at the bottom center is d4.

[0041] During assembly, the nesting section of the inner lining tube connector 3 and the inner lining repair hose 1 is an irregular cylinder with a reduced diameter section in the middle, forming a sealing and fixing groove 303, which forms an annular cavity after being nested with the inner lining repair hose 1; and the shape of the groove is perfectly matched with the bottom of the fastening clamp 401.

[0042] Utilizing the aforementioned lining repair joint connection and mechanical fixing device for thermal pipelines, this invention also provides a connection and fixing method, which is as follows:

[0043] The inner lining repair hose 1 is nested on the outer wall of the inner lining pipe joint 3. The inner wall of the inner lining repair hose 1 is tightly fitted with the outer wall of the inner lining support and fixing pipe 302, forming an annular cavity with the sealing and fixing groove 303. One end of the inner lining repair hose 1 extends into the thermal working pipe 5 to be repaired and fits against its inner wall, while the other end is fitted and pressed against one side of the joint connecting flange 301. The outer working pipe 202 is nested on the outer wall of the inner lining repair hose 1, with the outer wall of the inner lining repair hose 1 tightly fitted against the inner wall of the outer working pipe 202. The outer joint flange 201 at one end of the outer working pipe 202 is connected to the flange of the thermal working pipe 5 to be repaired via connecting bolts 307, and the outer joint flange 201 at the other end is connected to the joint connecting flange 301 via connecting bolts 307. The working pipe connecting flange 306 is connected to the flange of the normal thermal working pipe 6 via connecting bolts 307, completing the initial connection of the inner lining repair joint and the initial fixation of the inner lining repair hose 1.

[0044] The two fastening clamps 401 of the fastening steel sleeve 4 are assembled on the outside of the outer sleeve joint 2, and their installation positions correspond to the sealing and fixing grooves 303. The mounting ears 402 at the same end of the two fastening clamps 401 are connected by fastening bolts 405 to complete the initial fixing of the fastening steel sleeve 4. At this time, the structure of the mechanical fixing of the inner lining repair pipe at the joint after assembly is shown in Figure 3(a).

[0045] Tighten the fastening bolts 405 symmetrically inward at both ends of the fastening sleeve 4 until there is no gap at the connection of the two fastening clamps 401. During this process, the two semi-circular fastening clamps 401 gradually approach each other, and the outer working tube 202 is subjected to circumferential compression force, causing it to bend inward along its contact surface with the fastening clamps 401. At the same time, the inner lining repair hose 1 at the same position also undergoes a similar inward bending deformation after being subjected to circumferential compression force. After the two fastening clamps 401 are fully assembled and fixed, the bending arc of the outer working tube 202 and the inner lining repair hose 1 at the deformed point matches the bottom arc of the fastening clamp 401. At this time, the inner wall of the inner lining repair hose 1 is tightly fitted with the sealing and fixing groove 303, completing the further fixation of the inner lining repair hose 1.

[0046] Through the fine-tuning threaded through holes 403 on both sides of the fastening clamp 401, fine-tuning bolts 406 are symmetrically screwed in to adjust the curvature of the contact surface between the outer working tube 202 and the bottom of the fastening clamp 401. This further tightens the outer working tube 202 and the inner lining repair hose 1, making the inner wall of the inner lining repair hose 1 fit more closely with the sealing and fixing groove 303, thus completing the mechanical fixation of the inner lining repair hose 1 and finally achieving the fixed connection of the inner lining repair joint. At this time, the structure of the mechanical fixation of the inner lining repair pipe at the assembled joint is shown in Figure 3(b).

[0047] This invention designs an internal and external joint mechanical structure suitable for thermal pipeline lining repair technology, combined with a detachable semi-circular fastening clamp, and the flexible use of fastening bolts and fine-tuning clamping bolts. This can meet the installation and fixation requirements of the lining repair pipeline at the joint under different working conditions, and improve the reliability of the joint connection and the working stability of the lining repair pipeline in thermal pipeline lining repair projects.

[0048] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A lining repair joint connection and mechanical fixing device for a thermal pipeline, characterized in that, It includes an inner lining tube joint, an inner lining repair hose, an outer lining tube joint, and a fastening steel sleeve, which are coaxially fitted together from the inside to the outside. The inner lining pipe joint includes an inner lining support and fixing pipe, a flange connecting pipe, a joint connecting flange, and a working pipe connecting flange; the inner lining support and fixing pipe and the flange connecting pipe are coaxially connected as one unit, and the inner wall of the pipe formed by the two is a cylindrical structure. A joint connecting flange is connected to the outer side of the connection between the two in the circumferential direction; an annular sealing and fixing groove is opened in the middle section of the outer wall of the inner lining support and fixing pipe in the circumferential direction, and a working pipe connecting flange is connected to the outer end of the flange connecting pipe; the working pipe connecting flange is used to connect to the flange of the normal thermal working pipe by connecting bolts. The inner lining repair hose is a round tube structure, which is sleeved on the outer wall of the inner lining support and fixing tube; one end of the inner lining repair hose is used to extend into the thermal working tube to be repaired and fit against its inner wall, and the other end is fitted and pressed against one side of the joint connection flange. The outer tube joint includes an outer joint flange and an outer working tube; the outer working tube is a circular tube structure with outer joint flanges connected to both ends; the outer joint flange at one end is connected to the flange of the thermal working tube to be repaired by connecting bolts, and the outer joint flange at the other end is connected to the joint connecting flange by connecting bolts. The fastening steel sleeve is fitted onto the outer wall of the outer working tube located outside the sealing and fixing groove, and is used to fit the inner lining repair hose and the outer tube connector located outside the sealing and fixing groove into the sealing and fixing groove. The fastening steel sleeve includes a fastening clamp and mounting ears. The two semi-circular fastening clamps are provided with mounting ears at both ends. The mounting ears are provided with fastening connection holes for inserting fastening bolts to achieve installation and fixation. The fastening clamps are provided with several fine-adjusting fastening threaded through holes along the circumference on both sides for inserting fine-adjusting clamping bolts. The fastening clamps are installed on the outside of the sealing and fixing groove, and the bottom curvature of the fastening clamps is the same as the curvature of the sealing and fixing groove. During use, the two fastening clamps of the fastening steel sleeve are assembled on the outside of the outer sleeve joint, with their installation positions corresponding to the sealing and fixing grooves. Fastening bolts are used to connect the mounting ears of the two fastening clamps at the same end, completing the initial fixing of the fastening steel sleeve. The fastening bolts are then symmetrically tightened inwards at both ends of the fastening steel sleeve until there is no gap at the connection point of the two fastening clamps. During this process, the two semi-circular fastening clamps gradually approach each other, and the outer working tube is subjected to circumferential compressive force, causing it to bend inwards along its contact surface with the fastening clamps. Simultaneously, the inner lining repair hose at the same position also undergoes a similar inward bending deformation after being subjected to circumferential compressive force. After the two fastening clamps are fully assembled and fixed, the bending arc of the outer working tube and the inner lining repair hose at the deformed point matches the bottom arc of the fastening clamps. At this point, the inner wall of the inner lining repair hose is tightly fitted with the sealing and fixing groove, completing the further fixing of the inner lining repair hose. By screwing in the fine-adjustment threaded through holes on both sides of the fastening clamp, fine-adjustment clamping bolts are symmetrically screwed in to adjust the curvature of the contact surface between the outer working tube and the bottom of the fastening clamp, further pressing the outer working tube and the inner lining repair hose, so that the inner wall of the inner lining repair hose fits more closely with the sealing and fixing groove, completing the mechanical fixing of the inner lining repair hose, and finally achieving the fixed connection of the inner lining repair joint.

2. The lining repair joint connection and mechanical fixing device for thermal pipelines according to claim 1, characterized in that, The outer connector flange has several first bolt holes machined along its circumference, and the connector flange and the working pipe flange have several second bolt holes machined along their circumference.

3. The lining repair joint connection and mechanical fixing device for thermal pipelines according to claim 1, characterized in that, The connection between the inner lining support fixing pipe, the flange connecting pipe, the joint connecting flange and the working pipe connecting flange is by welding, and the connection between the outer joint flange and the outer working pipe is by welding.

4. The lining repair joint connection and mechanical fixing device for thermal pipelines according to claim 1, characterized in that, The contact side between the fastening clamp and the outer working tube has an arc-shaped structure, and the diameter at the center of the arc-shaped structure is [missing information]. d 4= d 303 + δ 1 + δ 202 ; in, d 303 To seal and fix the outer diameter of the pipe in the groove, δ 1 represents the wall thickness of the inner lining repair hose. δ 202 The wall thickness of the outer working tube.

5. The lining repair joint connection and mechanical fixing device for thermal pipelines according to claim 1, characterized in that, The fine-tuning fastening threaded through holes on both sides of the fastening clamp are symmetrically distributed.

6. A connection and fixing method using the lining repair joint connection and mechanical fixing device of the thermal pipeline according to any one of claims 1 to 5, characterized in that, Specifically as follows: The inner lining repair hose is nested on the outer wall of the inner lining pipe joint, with the inner wall of the inner lining repair hose tightly fitted to the outer wall of the inner lining support and fixing pipe, forming an annular cavity with the sealing and fixing groove; one end of the inner lining repair hose extends into the thermal working pipe to be repaired and fits against its inner wall, while the other end is fitted and pressed against one side of the joint connecting flange; the outer working pipe is nested on the outer wall of the inner lining repair hose, with the outer wall of the inner lining repair hose tightly fitted to the inner wall of the outer working pipe; the outer joint flange at one end of the outer working pipe is connected to the flange of the thermal working pipe to be repaired by connecting bolts, and the outer joint flange at the other end is connected to the joint connecting flange by connecting bolts; the working pipe connecting flange is connected to the flange of the normal thermal working pipe by connecting bolts, completing the initial connection of the inner lining repair joint and the initial fixation of the inner lining repair hose; Two fastening clamps of the fastening steel sleeve are assembled on the outside of the outer sleeve joint, with their installation positions corresponding to the sealing and fixing grooves. Fastening bolts are used to connect the mounting ears of the two fastening clamps at the same end, completing the initial fixing of the fastening steel sleeve. The fastening bolts are then symmetrically tightened inwards at both ends of the fastening steel sleeve until there is no gap at the connection point of the two fastening clamps. During this process, the two semi-circular fastening clamps gradually approach each other, and the outer working tube is subjected to circumferential compressive force, causing it to bend inwards along its contact surface with the fastening clamps. Simultaneously, the inner lining repair hose at the same position also undergoes a similar inward bending deformation after being subjected to circumferential compressive force. After the two fastening clamps are fully assembled and fixed, the bending arc of the outer working tube and the inner lining repair hose at the deformed point matches the bottom arc of the fastening clamps. At this point, the inner wall of the inner lining repair hose is tightly fitted with the sealing and fixing groove, completing the further fixing of the inner lining repair hose. By screwing in the fine-adjustment threaded through holes on both sides of the fastening clamp, fine-adjustment clamping bolts are symmetrically screwed in to adjust the curvature of the contact surface between the outer working tube and the bottom of the fastening clamp, further pressing the outer working tube and the inner lining repair hose, so that the inner wall of the inner lining repair hose fits more closely with the sealing and fixing groove, completing the mechanical fixing of the inner lining repair hose, and finally achieving the fixed connection of the inner lining repair joint.

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