Manhole root seal device

Abstract

The utility model relates to the technical field of pipeline construction, disclose a manhole root plugging device, include: positioning structure is equipped on the manhole corresponding manhole connecting pipe and makes the leakage point of manhole root expose in positioning structure, and positioning structure is adjacent to leakage point and is fixedly connected with manhole connecting pipe, sealing structure includes connecting band and sealing element, and connecting band is around and is equipped on manhole connecting pipe and covers manhole root, and sealing element sets up on connecting band, and connecting band is along the side of manhole axial abutment with positioning structure, and the other side abutment with the manhole opening face adjacent to manhole root, and sealing element is at least partially located between connecting band and manhole root to cover leakage point, and the both ends of connecting band along its length direction are connected with locking structure, and locking structure can tighten connecting band and make sealing element abut in manhole root to block leakage point. The utility model discloses a manhole root plugging device to the plugging effect of manhole root leakage point is good, and convenient operation can realize fast plugging.

Description

Technical Field

[0001] This utility model relates to the field of pipeline construction technology, and in particular to a manhole root sealing device. Background Technology

[0002] Manholes are typically required in industrial equipment, pipelines, containers, or building structures for maintenance, cleaning, and safe escape. When a leak occurs at the base of the manhole, sealing tools must be used to promptly plug the leak.

[0003] Currently, when a leak occurs at the base of a manhole, a clamp is typically installed at the base of the manhole to cover the leaking area. Sealant is then injected into the leak point through an injection valve to fill the gap. However, the injection pressure is difficult to control; excessive pressure may widen the gap, while insufficient pressure will prevent complete filling. Dynamic adjustments are required, resulting in low sealing efficiency. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a manhole root sealing device that has a good sealing effect on leakage points at the manhole root and can achieve rapid sealing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A manhole root sealing device is provided, comprising:

[0007] A positioning structure is sleeved on the manhole connecting pipe corresponding to the manhole and exposes the leakage point at the root of the manhole to the positioning structure. The positioning structure is adjacent to the leakage point and is fixedly connected to the manhole connecting pipe.

[0008] A sealing structure comprising a connecting strip and a sealing element, the connecting strip being wound around the manhole connecting pipe and covering the root of the manhole, the sealing element being disposed on the connecting strip, the connecting strip abutting against the positioning structure on one side along the axial direction of the manhole and against the manhole opening surface adjacent to the root of the manhole on the other side, the sealing element being at least partially located between the connecting strip and the root of the manhole to cover the leakage point;

[0009] A locking structure is provided, wherein the two ends of the connecting strip are connected to the locking structure along its length, and the locking structure can tighten the connecting strip to press the seal against the root of the manhole to seal the leakage point.

[0010] As a further embodiment of the manhole root sealing device, the positioning structure includes a positioning chain and a fastener. One end of the positioning chain is connected to the fastener, and the other end bypasses the manhole connecting pipe and is engaged with the fastener and locked by the fastener.

[0011] As a further embodiment of the manhole root sealing device, the fastener includes a fixed handle, a movable handle, a first connecting part, a second connecting part, and a hook. One end of the movable handle and one end of the fixed handle are rotatably connected to both ends of the first connecting part, and both ends of the second connecting part are rotatably connected to the fixed handle and the movable handle near the second connecting part, respectively. All rotation axes extend along a first direction. The hook is connected to the end of the fixed handle near the first connecting part. One end of the positioning chain is fixedly connected to the first connecting part, and the other end can bypass the manhole connecting pipe and engage with the hook. The movable handle, the first connecting part, and the second connecting part are arranged in an irregular quadrilateral structure. The included angle between the movable handle and the second connecting part is α. When α is an obtuse angle less than 180°, the fastener is in a non-locked state. When α is greater than 180°, the movable handle is attached to the fixed handle, the fastener is in a locked state, and the positioning chain is tightened and fixed on the manhole connecting pipe.

[0012] As a further embodiment of the manhole root sealing device, a slider is connected to the end of the second connecting part away from the movable handle. The fixed handle has a groove along its length, the opening of the groove faces the movable handle, and two grooves opposite each other in the groove are recessed into sliding grooves. The slider slides in cooperation with the sliding grooves.

[0013] The positioning structure also includes an adjusting screw. The end of the fixed handle away from the first connecting part is provided with a first threaded hole that communicates with the groove. The adjusting screw is screwed into the first threaded hole and can extend into the groove to abut against the slider.

[0014] As a further embodiment of the manhole root sealing device, the positioning structure also includes a screw handle, which is perpendicularly connected to one end of the adjusting screw exposed in the groove.

[0015] As a further embodiment of the manhole root sealing device, the sealing element is a sleeve-type structure, and the sealing element is sleeved on the outer periphery of the connecting strip.

[0016] As a further embodiment of the manhole root sealing device, the locking structure includes a hydraulic pump, a cylinder, a lock seat, a lock head, several first set screws, and several second set screws. The lock seat has two fixing holes extending along its length direction, spaced apart along the width direction of the lock seat. The lock seat has several second threaded holes communicating with the fixing holes on one side along its thickness direction, each second threaded hole corresponding to one of the first set screws. The lock head is located on one side of the lock seat along its length direction. The lock head has two coaxial connecting holes corresponding to the fixing holes, and a third threaded hole communicating with the connecting holes on one side along its thickness direction. The third threaded hole corresponds one-to-one with the second set screw; the hydraulic cylinder is mounted on the lock seat and connected to the hydraulic pump through a connecting pipe; the piston rod of the hydraulic cylinder is located on the side of the lock seat facing the lock head and abuts against the lock head; both ends of the connecting band can pass through the connecting hole and be inserted into the fixing hole; the first set screw is screwed into the corresponding second threaded hole to press the connecting band against the fixing hole; the piston rod of the hydraulic cylinder can drive the lock head to move relative to the connecting band in a direction away from the lock seat to tighten the connecting band; the second set screw is screwed into the corresponding third threaded hole to press the tightened connecting band against the connecting hole.

[0017] As a further embodiment of the manhole root sealing device, the second threaded hole is located on the side of the lock seat opposite to the manhole opening surface, and the third threaded hole is located on the side of the lock head opposite to the manhole opening surface.

[0018] As a further embodiment of the manhole root sealing device, the locking structure also includes a plurality of third set screws, and the lock head is provided with fourth threaded holes communicating with the corresponding connecting holes on both sides along its width direction. The third set screws can be screwed into the fourth threaded holes to press the tightened connecting band against the connecting holes.

[0019] As a further embodiment of the manhole root sealing device, the second threaded holes corresponding to the two fixed holes are offset along the width and length directions of the lock seat.

[0020] Beneficial effects:

[0021] This invention allows for the fixing of a positioning structure to the manhole root based on the location and size of the leak point, ensuring the leak point is between the positioning structure and the manhole opening surface, with the positioning structure adjacent to the leak point. A connecting strip with a sealing element on its surface is then wrapped around the manhole connecting pipe, and the position of the sealing element is adjusted so that it precisely covers the leak point. Finally, a locking structure tightens the connecting strip, thus pressing the sealing element against the corresponding leak point at the manhole root, effectively sealing the leak. Compared to existing glue-filled sealing devices, this manhole root sealing device does not adversely affect the leak point, provides a better sealing effect, and enables rapid sealing. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the manhole root sealing device described in this embodiment of the invention when sealing the leakage point at the manhole root;

[0024] Figure 2 This is a schematic diagram of the positioning structure described in an embodiment of the present utility model;

[0025] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0026] Figure 4 This is a schematic diagram showing the fixed handle, movable handle, first connecting part, and second connecting part in an unlocked state according to an embodiment of the present utility model.

[0027] Figure 5 This is a schematic diagram of the assembly structure of the sealing structure and locking structure (excluding the connecting pipe and hydraulic pump) according to an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the locking structure (excluding the connecting pipe and hydraulic pump) described in an embodiment of the present utility model.

[0029] In the picture:

[0030] 1. Positioning structure; 11. Positioning chain; 12. Fixed handle; 121. Groove; 122. Slide groove; 13. Movable handle; 14. First connecting part; 15. Second connecting part; 16. Hook; 17. Slider; 18. Adjusting screw; 19. Tightening handle;

[0031] 2. Sealing structure; 21. Connecting strip; 22. Sealing element;

[0032] 3. Locking structure; 31. Hydraulic pump; 32. Lock seat; 321. Fixing hole; 33. Lock head; 331. Connecting hole; 34. First set screw; 35. Second set screw; 36. Connecting pipe; 37. Third set screw;

[0033] 100. Manhole connecting pipe; 200. Manhole opening face. Detailed Implementation

[0034] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0038] like Figure 1 As shown, an embodiment of this utility model provides a manhole root sealing device, including a positioning structure 1, a sealing structure 2, and a locking structure 3.

[0039] The positioning structure 1 is fitted onto the manhole connecting pipe 100 corresponding to the manhole, exposing the leakage point at the root of the manhole to the positioning structure 1. The positioning structure 1 is adjacent to the leakage point and fixedly connected to the manhole connecting pipe 100. The sealing structure 2 includes a connecting strip 21 and a sealing element 22. The connecting strip 21 is wrapped around the manhole connecting pipe 100 and covers the root of the manhole. The sealing element 22 is disposed on the connecting strip 21. One side of the connecting strip 21 along the manhole axis abuts against the positioning structure 1, and the other side abuts against the manhole opening surface 200 adjacent to the root of the manhole. The sealing element 22 is at least partially located between the connecting strip 21 and the root of the manhole to cover the leakage point. Both ends of the connecting strip 21 along its length direction are connected to the locking structure 3. The locking structure 3 can tighten the connecting strip 21 so that the sealing element 22 is pressed against the root of the manhole to seal the leakage point.

[0040] In this embodiment, the manhole opening surface 200 refers to a structural surface in which a manhole is opened; the manhole root refers to the connection point between the manhole connecting pipe 100 and the manhole on the manhole opening surface 200 and the area adjacent to it, where leakage points are prone to occur; after the manhole connecting pipe 100 is connected to the manhole, the end of the manhole connecting pipe 100 is sealed by a flange.

[0041] It is understood that before sealing the leak point using the manhole root sealing device of this embodiment, the positioning structure 1 is first fixed on the manhole root according to the location and size of the leak point, so that the leak point is located between the positioning structure 1 and the manhole opening surface 200, and the positioning structure 1 is adjacent to the leak point; then the connecting band 21 with the sealing element 22 on its surface is wrapped around the manhole connecting pipe 100, and the position of the sealing element 22 is adjusted so that the sealing element 22 just covers the leak point; finally, the connecting band 21 is tightened by the locking structure 3, so that the sealing element 22 is pressed against the position of the corresponding leak point at the manhole root by the connecting band 21, thereby sealing the leak point at the manhole root.

[0042] Compared with existing glue-filled sealants, the manhole root sealing device of this embodiment does not have an adverse effect on the leakage point due to the sealing element 22, has a good sealing effect, and can achieve rapid sealing.

[0043] In this embodiment, the width of the connecting strip 21 can be determined according to the structure of the leakage point. The width of the connecting strip 21 is not less than the size of the leakage point along the width direction of the connecting strip 21, which can improve the sealing effect.

[0044] Furthermore, such as Figure 2 and Figure 3As shown, the positioning structure 1 includes a positioning chain 11 and a fastener. One end of the positioning chain 11 is connected to the fastener, and the other end passes around the manhole connecting pipe 100 and is engaged with the fastener and locked by the fastener.

[0045] In this embodiment, since the positioning chain 11 has multiple spaced snap-fit ​​gaps along its length, when the positioning chain 11 is used for positioning, the positioning structure 1 of this embodiment can be adapted to the sealing of leakage points at the root of the manhole corresponding to more specifications of manhole connecting pipes 100.

[0046] Furthermore, the fastener includes a fixed handle 12, a movable handle 13, a first connecting part 14, a second connecting part 15, and a hook 16. One end of the movable handle 13 and one end of the fixed handle 12 are rotatably connected to both ends of the first connecting part 14, and both ends of the second connecting part 15 are rotatably connected to the fixed handle 12 and the movable handle 13 near the second connecting part 15, respectively. All rotation axes extend in the same direction. The hook 16 is connected to the end of the fixed handle 12 near the first connecting part 14. One end of the positioning chain 11 is fixedly connected to the first connecting part 14, and the other end can bypass the manhole connecting pipe 100 and engage with the hook 16. The movable handle 13, the first connecting part 14, and the second connecting part 15 are arranged in an irregular quadrilateral structure. Figure 4 As shown, the included angle between the movable handle 13 and the second connecting part 15 is α. When α is an obtuse angle less than 180°, the fastener is in a non-locked state; when α is greater than 180°, the movable handle 13 is close to the fixed handle 12, the fastener is in a locked state, and the positioning chain 11 is tightened and fixed on the manhole connecting pipe 100.

[0047] In this embodiment, one end of the positioning chain 11 is connected to the first connecting part 14, and the other end is engaged with the hook 16 fixed to the end of the fixed handle 12. Then, the operator holds the fixed handle 12 and the movable handle 13, causing the movable handle 13 to rotate relative to the first connecting part 14 and the second connecting part 15. The second connecting part 15 and the second connecting part 15 rotate relative to the fixed handle 12 at the same time, causing deformation of the non-regular quadrilateral structure. This increases the angle α between the movable handle 13 and the second connecting part 15 (the interior angle between the movable handle 13 and the second connecting part 15, i.e., the angle within the quadrilateral) from an obtuse angle less than 180° to greater than 180°. This allows the movable handle 13 to move closer to the fixed handle 12 and remain fixed relative to the fixed handle 12 when no external force is applied, preventing the hook 16 from separating from the positioning chain 11 and affecting the positioning stability.

[0048] Conversely, when it is necessary to unlock, pull the movable handle 13 in the opposite direction to reduce the included angle α between the movable handle 13 and the second connecting part 15 from greater than 180° to an obtuse angle less than 180°. At this time, the hook 16 and the positioning chain 11 can be disengaged and separated.

[0049] Furthermore, the end of the second connecting part 15 away from the movable handle 13 is connected to a slider 17, and the fixed handle 12 has a groove 121 along its length direction. The opening of the groove 121 faces the movable handle 13. The two opposite groove walls of the groove 121 are recessed with sliding grooves 122, and the slider 17 slides in the sliding grooves 122. The positioning structure 1 also includes an adjusting screw 18. The end of the fixed handle 12 away from the first connecting part 14 is provided with a first threaded hole communicating with the groove 121. The adjusting screw 18 is screwed into the first threaded hole and can extend into the groove 121 to abut against the slider 17.

[0050] When the operator holds the fixed handle 12 and the movable handle 13 and rotates the movable handle 13 toward the fixed handle 12, the slider 17 abuts against the end of the adjusting screw 18 that extends into the groove 121. By turning the adjusting screw 18, the length of the adjusting screw 18 extending into the groove 121 can be adjusted, that is, the angle between the second connecting part 15 and the movable handle 13 can be adjusted, thereby adjusting the tension of the positioning chain 11.

[0051] Furthermore, the positioning structure 1 also includes a screw handle 19, which is perpendicularly connected to one end of the adjusting screw 18 exposed in the groove 121. The adjusting screw 18 can be quickly adjusted by rotating the screw handle 19.

[0052] like Figure 5 As shown, the sealing element 22 is a sleeve-type structure, and the sealing element 22 is sleeved on the outer periphery of the connecting strip 21.

[0053] In this embodiment, the sealing element 22 is designed as a sleeve structure and is fitted onto the connecting strip 21. When adjusting the position of the sealing element 22, it is only necessary to move it along the length of the connecting strip 21 so that the sealing element 22 reaches the position of the leakage point and covers the leakage point, which is convenient to operate.

[0054] Furthermore, such as Figure 1 , Figure 5 and Figure 6As shown, the locking structure 3 includes a hydraulic pump 31, a cylinder, a lock seat 32, a lock head 33, several first set screws 34, and several second set screws 35. The lock seat 32 has two fixing holes 321 extending along its length direction, and the two fixing holes 321 are spaced apart along the width direction of the lock seat 32. The lock seat 32 has several second threaded holes communicating with the fixing holes 321 on one side along its thickness direction, and the second threaded holes correspond one-to-one with the first set screws 34. The lock head 33 is located on one side of the lock seat 32 along its length direction, and the lock head 33 has two coaxial connecting holes 331 corresponding one-to-one with the fixing holes 321. The lock head 33 has a third threaded hole communicating with the connecting holes 331 on one side along its thickness direction. The three threaded holes correspond one-to-one with the second set screw 35; the hydraulic cylinder is mounted on the lock seat 32 and connected to the hydraulic pump 31 through the connecting pipe 36. The piston rod of the hydraulic cylinder is located on the side of the lock seat 32 facing the lock head 33 and abuts against the lock head 33; the two ends of the connecting band 21 can pass through the connecting hole 331 and be inserted into the fixing hole 321. The first set screw 34 is screwed into the corresponding second threaded hole to press the connecting band 21 against the fixing hole 321. The piston rod of the hydraulic cylinder can drive the lock head 33 to move relative to the connecting band 21 in a direction away from the lock seat 32 to tighten the connecting band 21. The second set screw 35 is screwed into the corresponding third threaded hole to press the tightened connecting band 21 against the connecting hole 331.

[0055] In specific operation, firstly, insert both ends of the connecting strip 21, which bypasses the manhole connecting pipe 100, into the corresponding connecting holes 331 and extend them into the corresponding fixing holes 321 (or through the fixing holes 321). Then, screw the first set screw 34 into the corresponding second threaded hole to tighten the connecting strip 21 against the fixing hole 321. Next, drive the piston rod of the cylinder with the hydraulic pump 31 to press against the lock head 33, causing the lock head 33 to move away from the lock seat 32 until the two ends of the connecting strip 21 are tightened by the lock head 33. Then, screw the second set screw 35 into the corresponding third threaded hole to tighten the connecting strip 21 against the connecting hole 331, thus completing the tightening of the connecting strip 21. The tightened connecting strip 21 presses the seal 22 against the leakage point, thereby sealing the leakage point at the root of the manhole.

[0056] When the connecting strap 21 is tightened, the first set screw 34 on the lock seat 32 can be unscrewed to allow the connecting strap 21 to exit the fixing hole 321. At this time, the lock head 33 and the connecting strap 21 are fixed together at the root of the manhole.

[0057] Furthermore, the second threaded hole is located on the side of the lock seat 32 opposite to the manhole opening surface 200, and the third threaded hole is located on the side of the lock head 33 opposite to the manhole opening surface 200. That is, the second threaded hole and the third threaded hole are located on the same side and opposite to the manhole opening surface 200, so as to facilitate the screwing operation.

[0058] The locking structure 3 also includes multiple third set screws 37. The lock head 33 is provided with fourth threaded holes on both sides along its width direction, which are connected to the corresponding connecting holes 331. The third set screws 37 can be screwed into the fourth threaded holes to press the tightened connecting band 21 against the connecting hole 331.

[0059] In this embodiment, after tightening the connecting band 21 by screwing the third set screw 37 into the third threaded hole, the third set screw 37 is then screwed into the fourth threaded holes on both sides of the lock head 33 along its width direction to further tighten the connecting band 21. By tightening in multiple directions, the connection stability between the tightened connecting band 21 and the lock head 33 can be further improved, and the sealing effect of the sealing element 22 at the leakage point can be avoided due to insufficient pressure of the connecting band 21.

[0060] In this embodiment, the second threaded holes corresponding to the two fixing holes 321 are offset along the width and length directions of the lock seat 32.

[0061] For example, each fixing hole 321 corresponds to two second threaded holes. The four second threaded holes corresponding to the two fixing holes 321 are staggered along the width direction of the lock seat 32 and also staggered along the length direction of the lock seat 32, so as to avoid the connection nodes being too concentrated and affecting the structural stability of the lock seat 32.

[0062] Of course, in other embodiments, a suitable number and size of second threaded holes can be designed according to the dimensions of the connecting band 21 and the lock seat 32, so as to ensure that the clamping force of the first set screw 34 on the connecting band 21 can withstand the thrust of the piston of the cylinder on the lock head 33 without affecting the structural stability of the lock seat 32.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A manhole root seal apparatus, comprising: include: A positioning structure is sleeved on the manhole connecting pipe corresponding to the manhole and exposes the leakage point at the root of the manhole to the positioning structure. The positioning structure is adjacent to the leakage point and is fixedly connected to the manhole connecting pipe. A sealing structure comprising a connecting strip and a sealing element, the connecting strip being wound around the manhole connecting pipe and covering the root of the manhole, the sealing element being disposed on the connecting strip, the connecting strip abutting against the positioning structure on one side along the axial direction of the manhole and against the manhole opening surface adjacent to the root of the manhole on the other side, the sealing element being at least partially located between the connecting strip and the root of the manhole to cover the leakage point; A locking structure is provided, wherein the two ends of the connecting strip are connected to the locking structure along its length, and the locking structure is capable of tightening the connecting strip to press the seal against the root of the manhole to seal the leakage point.

2. The manhole root seal apparatus of claim 1, wherein, The positioning structure includes a positioning chain and a fastener. One end of the positioning chain is connected to the fastener, and the other end passes around the manhole connecting pipe and is engaged with the fastener and locked by the fastener.

3. The manhole root sealing device according to claim 2, characterized in that, The fastener includes a fixed handle, a movable handle, a first connecting part, a second connecting part, and a hook. One end of the movable handle and one end of the fixed handle are rotatably connected to both ends of the first connecting part, and both ends of the second connecting part are rotatably connected to the fixed handle and the movable handle near the second connecting part, respectively. All rotation axes extend along a first direction. The hook is connected to the end of the fixed handle near the first connecting part. One end of the positioning chain is fixedly connected to the first connecting part, and the other end can bypass the manhole connecting pipe and engage with the hook. The movable handle, the first connecting part, and the second connecting part are arranged in an irregular quadrilateral structure. The included angle between the movable handle and the second connecting part is α. When α is an obtuse angle less than 180°, the fastener is in a non-locked state. When α is greater than 180°, the movable handle is attached to the fixed handle, the fastener is in a locked state, and the positioning chain is tightened and fixed on the manhole connecting pipe.

4. The manhole root sealing device according to claim 3, characterized in that, The second connecting part is connected to a slider at the end away from the movable handle. The fixed handle has a groove along its length, the opening of the groove faces the movable handle, and two opposite groove walls of the groove are recessed with sliding grooves. The slider slides in cooperation with the sliding grooves. The positioning structure also includes an adjusting screw. The end of the fixed handle away from the first connecting part is provided with a first threaded hole that communicates with the groove. The adjusting screw is screwed into the first threaded hole and can extend into the groove to abut against the slider.

5. The manhole root sealing device according to claim 4, characterized in that, The positioning structure also includes a screw handle, which is perpendicularly connected to one end of the adjusting screw that is exposed in the groove.

6. The manhole root sealing device according to claim 1, characterized in that, The sealing element is a sleeve-type structure, and the sealing element is sleeved on the outer periphery of the connecting strip.

7. The manhole root sealing device according to any one of claims 1 to 6, characterized in that, The locking structure includes a hydraulic pump, a cylinder, a lock seat, a lock head, several first set screws, and several second set screws. The lock seat has two fixing holes extending along its length direction, and the two fixing holes are spaced apart along the width direction of the lock seat. The lock seat has several second threaded holes communicating with the fixing holes on one side along its thickness direction, and each of the second threaded holes corresponds to one of the first set screws. The lock head is located on one side of the lock seat along its length direction. The lock head has two coaxial connecting holes corresponding to the fixing holes. The lock head also has a third threaded hole communicating with the connecting holes on one side along its thickness direction. The second set screw corresponds one-to-one; the hydraulic cylinder is mounted on the lock seat and connected to the hydraulic pump via a connecting pipe; the piston rod of the hydraulic cylinder is located on the side of the lock seat facing the lock head and abuts against the lock head; both ends of the connecting band can pass through the connecting hole and be inserted into the fixing hole; the first set screw is screwed into the corresponding second threaded hole to press the connecting band against the fixing hole; the piston rod of the hydraulic cylinder can drive the lock head to move relative to the connecting band in a direction away from the lock seat to tighten the connecting band; the second set screw is screwed into the corresponding third threaded hole to press the tightened connecting band against the connecting hole.

8. The manhole root sealing device according to claim 7, characterized in that, The second threaded hole is located on the side of the lock seat opposite to the manhole opening surface, and the third threaded hole is located on the side of the lock head opposite to the manhole opening surface.

9. The manhole root sealing device according to claim 8, characterized in that, The locking structure also includes multiple third set screws, and the lock head is provided with fourth threaded holes communicating with the corresponding connecting holes on both sides along its width direction. The third set screws can be screwed into the fourth threaded holes to press the tightened connecting band against the connecting holes.

10. The manhole root sealing device according to claim 7, characterized in that, The second threaded holes corresponding to the two fixing holes are offset along the width and length directions of the lock seat.

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