Manhole connecting device and buried equipment

Abstract

The utility model relates to the technical field of buried equipment, in particular to a manhole connecting device and buried equipment. The manhole connecting device comprises an upper connecting piece, a double-wall corrugated pipe and a lower connecting piece which are connected, the upper connecting piece can be connected with a manhole cover in a locking mode, and the lower connecting piece can be installed at the opening end of a manhole body in a locking mode. The upper connecting piece comprises a first pipe body and a second pipe body, the first pipe body and the second pipe body are coaxially connected in a stepped mode, a plurality of first lock catches are arranged on the periphery of the first pipe body, and a plurality of first protruding blocks are arranged on the surrounding edge of the manhole cover inwards. The manhole cover can rotate to drive the first protruding blocks to slide into the first lock catches along the periphery of the first pipe body. The manhole connecting device can improve the installation convenience and reliability between the manhole body and the manhole cover and the switching operation efficiency. The manhole connecting device is easy to install, convenient to transport and capable of saving cost, can meet the requirements for the burial depth height and position of different buried devices, and has high installation universality.

Description

Technical Field

[0001] The utility model relates to the technical field of buried equipment, in particular to a manhole connection device and a buried equipment. Background Art

[0002] Buried equipment refers to equipment buried underground. Some buried equipment is usually provided with a channel-type opening structure for relevant personnel to enter and exit for installation, maintenance, and safety inspection, which is usually called a manhole.

[0003] In the existing buried equipment, the installation of manholes is generally divided into the following several forms: One is to build a manhole with bricks at the reserved manhole of the equipment, and then cover it with a standard manhole cover. Not only is the manhole cover very heavy and inconvenient to operate, but the bricklaying form also has a large amount of civil engineering work, resulting in an increase in cost; the second is to directly weld a steel manhole on the steel structure equipment body. This method has a simple structure and does not require installation, but due to the transportation height limit, the manhole cannot be made too high and the versatility is not strong; the third is to transport the steel structure equipment and the steel manhole separately, and use bolts to connect them at the site. Although this connection method solves the transportation problem, too many bolts will also cause inconvenience during installation and the work is cumbersome.

[0004] Therefore, it is urgent to develop a manhole connection device that is simple to install, convenient to operate, and convenient to transport. Summary of the Utility Model

[0005] The utility model provides a manhole connection device and a buried equipment, which are used to solve the defects of inconvenient switching operation, complex installation, and high transportation difficulty in the prior art, realize simple installation, convenient transportation, save costs, and can meet the buried depth height requirements of different buried equipment, and have high installation versatility.

[0006] The utility model provides a manhole connection device, which includes a connected upper connecting piece, a double-wall corrugated pipe, and a lower connecting piece. The upper connecting piece can be locked and connected with the manhole cover, and the lower connecting piece can be locked and installed at the opening end of the manhole body; wherein, the upper connecting piece includes a first pipe body and a second pipe body, the first pipe body and the second pipe body are coaxially connected in a stepped shape, a plurality of first locks are constructed on the periphery of the first pipe body, and a plurality of first protrusions are constructed inward on the periphery of the manhole cover. The manhole cover can drive each of the first protrusions to slide into each of the first locks along the periphery of the first pipe body by rotation.

[0007] According to a manhole connection device provided by the utility model, a plurality of chutes are constructed on the periphery of the first pipe body, the first lock is constructed with an inlet end and a blind end, and the extension section of the inlet end of the first lock is provided with the chute; the manhole cover can drive the first protrusion to slide through the chute by rotation and reach the blind end through the inlet end of the first lock.

[0008] According to a manhole connection device provided by the present utility model, the upper connecting member further includes a baffle, the baffle is constructed at the connection of the first pipe body and the second pipe body and extends outward relative to the second pipe body; a groove is constructed at the position of the baffle facing the double-wall corrugated pipe, and the top end of the double-wall corrugated pipe can be inserted and fixed in the groove.

[0009] According to a manhole connection device provided by the present utility model, a plurality of second bumps are constructed inward at the bottom of the lower connecting member, and a plurality of second latches are constructed at the position of the outer wall of the manhole body near the opening end. The lower connecting member can drive each of the second bumps to slide into each of the second latches along the outer wall of the manhole body by rotation.

[0010] According to a manhole connection device provided by the present utility model, a plurality of slideways are constructed around the manhole body. The second latch is constructed with an inlet end and a blind end, and an extension section of the inlet end of the second latch is provided with the slideway; the lower connecting member can drive the second bump to slide through the slideway by rotation and reach the blind end through the inlet end of the second latch.

[0011] According to a manhole connection device provided by the present utility model, at least one group of skirt edges is constructed on the outer wall of the manhole body, and each of the second latches is evenly distributed at the same cross-sectional position of the outer wall surface of the manhole body and is located above the skirt edge closest to the opening end of the manhole body.

[0012] According to a manhole connection device provided by the present utility model, the lower connecting member includes a fourth pipe body and a fifth pipe body, and the fourth pipe body and the fifth pipe body are connected in a stepped manner; the fourth pipe body has a first axis, the fifth pipe body has a second axis, the first axis coincides with the axis of the manhole cover, the second axis coincides with the axis of the manhole body, and the first axis is parallel to or coincides with the second axis.

[0013] According to a manhole connection device provided by the present utility model, the lower connecting member further includes a platform and a plurality of reinforcing ribs. The platform is constructed at the connection of the fourth pipe body and the fifth pipe body, and the platform extends outward relative to the fourth pipe body; each of the reinforcing ribs is connected between the platform and the outer wall of the fifth pipe body.

[0014] The present utility model also provides an underground equipment, including an equipment main body and a manhole cover.

[0015] The equipment main body is provided with a manhole body.

[0016] The manhole cover is connected to the manhole body through the manhole connection device as described above.

[0017] According to a buried device provided by the present utility model, the manhole cover includes a cover body and a peripheral edge. One surface of the cover body is configured with a plurality of ribs, and each of the ribs protrudes outward from the cover body; the peripheral edge is connected to the other surface of the cover body.

[0018] The manhole connection device provided by the present utility model includes a connected upper connecting piece, a double-wall corrugated pipe, and a lower connecting piece. The upper connecting piece can be locked and connected to the manhole cover, and the lower connecting piece can be locked and installed at the opening end of the manhole body; wherein, the upper connecting piece includes a first pipe body and a second pipe body. The first pipe body and the second pipe body are coaxially connected in a stepped manner. A plurality of first locking latches are configured on the periphery of the first pipe body. A plurality of first protrusions are configured inwardly on the peripheral edge of the manhole cover. The manhole cover can drive each first protrusion to slide into each first locking latch along the periphery of the first pipe body through rotation. This manhole connection device can be reliably fixed between the opening end of the manhole body and the manhole cover, and this manhole connection device can not only be reliably locked with the manhole body, but also be reliably fixed with the manhole cover, thereby improving the installation convenience and reliability between the manhole body and the manhole cover, as well as the efficiency of the opening and closing operation. Moreover, this manhole connection device can achieve simple installation, convenient transportation, and cost savings, and the double-wall corrugated pipe can be appropriately cut and adjusted at a small angle according to the position relationship between the hole channel of the buried manhole body and the position of the manhole cover on the ground surface, so as to flexibly adjust the height and position relationship between the manhole cover and the manhole body through the double-wall corrugated pipe, and thus can adapt to the buried depth height and position requirements of different buried devices, and has high installation versatility. Moreover, this manhole connection device adopts a rotational molding production process with raw materials of high-density polyethylene (HDPE), is corrosion-resistant, and has high strength, and is suitable for buried environmental conditions.

[0019] Since the buried device provided by the present utility model is equipped with the above-mentioned manhole connection device, the buried device has all the advantages of the above-mentioned manhole connection device, and the same parts will not be described in detail here. On this basis, the buried device can further optimize the structure of the manhole cover for the above-mentioned manhole connection device, improve the strength and load-bearing performance of the manhole cover by setting ribs on the surface of the cover body, and optimize the structure of the peripheral edge, so as to achieve the locking assembly with the upper connecting piece of the manhole connection device, and further improve the connection strength and disassembly efficiency between the manhole body and the manhole cover of the buried device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1It is an exploded structural view of the manhole connection device provided by the present utility model.

[0022] Figure 2 It is a sectional exploded view of the structure of the manhole connection device provided by the present utility model.

[0023] Figure 3 It is a structural view of the manhole cover provided by the present utility model.

[0024] Figure 4 It is a structural view of the upper connecting member provided by the present utility model.

[0025] Reference numerals:

[0026] 1. Manhole cover; 11. Perimeter edge; 12. Cover plate; 13. Rib; 14. First convex block; 2. Upper connecting member; 21. First pipe body; 22. Baffle; 23. Second pipe body; 24. First lock; 25. Slideway; 3. Double-wall corrugated pipe; 31. Third pipe body; 32. Corrugated body; 4. Lower connecting member; 41. Fourth pipe body; 42. Platform; 43. Fifth pipe body; 44. Second convex block; 45. Reinforcing rib; 5. Manhole body; 51. Sixth pipe body; 52. Skirt; 53. Second lock; 91. First axis; 92. Second axis. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are some, rather than all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0028] The following combines Figures 1 - 4 to describe the manhole connection device and underground equipment of the present utility model.

[0029] As Figure 1 and Figure 2As shown in the figure, the manhole connection device of the present utility model is connected and fixed between the manhole cover 1 and the manhole body 5. The manhole connection device includes a connected upper connecting piece 2, a double-wall corrugated pipe 3, and a lower connecting piece 4. The upper connecting piece 2 can be locked and connected to the manhole cover 1 to increase the connection reliability and disassembly and assembly efficiency between the manhole connection device and the manhole cover 1. The double-wall corrugated pipe 3 can be cut, and the length can be flexibly controlled by utilizing the characteristics of the double-wall corrugated pipe 3. By changing the length, the height and position relationship between the manhole cover 1 and the manhole body 5 can be flexibly adjusted, so as to adapt to the buried depth height and position requirements of different buried equipment, and has high installation versatility. The lower connecting piece 4 can be locked and installed at the open end of the manhole body 5 to increase the connection reliability and disassembly and assembly efficiency between the manhole connection device and the manhole body 5.

[0030] It can be seen from this that the manhole connection device can be reliably fixed between the open end of the manhole body 5 and the manhole cover 1, and the manhole connection device can be reliably locked with the manhole body 5 and can also be reliably fixed to the manhole cover 1, thereby improving the installation reliability between the manhole body 5 and the manhole cover 1 and the efficiency of opening and closing operations, realizing simple installation, convenient transportation and greatly saving construction costs.

[0031] In some embodiments, as Figure 2 and Figure 3 shown, the manhole cover 1 includes a cover body and a peripheral edge 11. A plurality of ribs 13 are formed on one surface of the cover body, and each rib 13 protrudes outward from the cover body, thereby forming a reinforcing structure on the surface of the cover body to improve the structural strength and load-bearing performance of the cover body. Referring to Figure 3 shown, preferably, the rib 13 and the cover body are integrally formed, that is, the rib 13 protrudes outward on the outer surface of the cover body. On the contrary, a plurality of grooves are automatically formed on the inner surface of the cover body (i.e., the surface facing the manhole body 5). The integral connection of the rib 13 and the cover body can increase the local thickness and support of the cover body. The peripheral edge 11 is connected to the other surface of the cover body for buckling and locking with the upper connecting piece 2.

[0032] In some embodiments, as Figure 2 and Figure 4 shown, the upper connecting piece 2 includes a first pipe body 21 and a second pipe body 23. The first pipe body 21 and the second pipe body 23 are coaxially connected in a stepped manner to realize variable-diameter connection between the manhole cover 1 and the corrugated pipe. The first pipe body 21 is connected to the manhole cover 1 and is preferably inserted into the peripheral edge 11 of the manhole cover 1. A plurality of first locks 24 are formed on the outer periphery of the first pipe body 21, and a plurality of first protrusions 14 are formed inwardly on the peripheral edge 11 of the manhole cover 1. Preferably, the number of the first locks 24 is equal to the number of the first protrusions 14. The manhole cover 1 and the first pipe body 21 of the upper connecting piece 2 are assembled and connected and can be locked in the first locks 24 through the first protrusions 14, thereby realizing the locking of the manhole cover 1 and the upper connecting piece 2.

[0033] In this embodiment, the manhole cover 1 can drive each first protrusion 14 to slide into each first lock buckle 24 along the periphery of the first tube body 21 by rotating, so as to realize the locking fit between the manhole cover 1 and the upper connecting member 2. In fact, other locking structures, such as a labyrinth buckle structure, can also be used. The lock buckle structure described in this embodiment has a limited position function, which will not cause the manhole cover 1 to rotate freely or fall off, and is easy to operate, and the assembly form is simple and fast.

[0034] In some specific embodiments, the periphery of the first tube body 21 is configured with a plurality of slideways 25. Figure 1 and Figure 4 As shown, the first lock buckle 24 is configured with an entrance end and a blind end. The extension section of the entrance end of the first lock buckle 24 is provided with a slideway 25. The manhole cover 1 can drive the first protrusion 14 to slide through the slideway 25 and reach the blind end through the entrance end of the first lock buckle 24 by rotating. The setting of the slideway 25 can provide a guide for the sliding of the first protrusion 14 during the rotation process of the manhole cover 1, so that the first protrusion 14 can slide into the first lock buckle 24 more smoothly and accurately, so that the manhole cover 1 can be more smoothly and quickly embedded in the upper connecting member 2.

[0035] In some specific embodiments, Figure 4 As shown, the upper connecting member 2 also includes a baffle 22. The baffle 22 is constructed at the connection between the first tube body 21 and the second tube body 23, and extends outward relative to the second tube body 23. Preferably, the above-mentioned first lock buckle 24 and slide 25 are both arranged outside the first tube body 21, and a space for the first protrusion 14 to slide is reserved between the baffle 22. The baffle 22 is configured with a groove facing the double-walled corrugated tube 3, and the groove can be used for the top end of the double-walled corrugated tube 3 to be inserted and fixed. During the assembly process of the upper connecting member 2 and the double-walled corrugated tube 3, the tube wall of the double-walled corrugated tube 3 is inserted into the groove of the upper connecting member 2, and the two wall surfaces are fixed with stainless steel self-tapping screws, and then foam glue is injected into the groove to complete the fixed fit and sealing.

[0036] It should be noted that, in this embodiment, the manhole cover 1 and the upper connecting member 2 can be rotated 90 degrees to achieve a locking fit between the two. In fact, the rotation angle is not unique, and is determined by the number of the first protrusions 14 and the first locking buckles 24 and the angles set on the pipe wall of the same cross section. It is only necessary to ensure that the manhole cover 1 can be covered on the upper connecting member 2 and rotated so that the first protrusion 14 slides into the blind end of the first locking buckle 24 and is locked.

[0037] In some specific embodiments, it is preferred that the side of the slideway 25 facing the baffle 22 is provided with an inclined guiding slope, so that the first bump 14 slides in the slideway 25 and fits more closely to the baffle 22. Preferably, the side of the slideway 25 near the open end of the first lock 24 is closer to the baffle 22, while the side away from the open end of the first lock 24 is farther from the baffle 22, so that the first lock 24 can slide more accurately into the open end of the first lock 24 after being guided by the slideway 25.

[0038] In some specific embodiments, it is preferred that the blind end of the first lock 24 is connected to the baffle 22, and the baffle 22 is used to block and lock the first bump 14 entering the blind end of the first lock 24. Preferably, the width of the blind end of the first lock 24 is smaller than the thickness of the first bump 14, so that the first bump 14 sliding into the blind end of the first lock 24 can be automatically bitten and locked in the position of the blind end of the first lock 24 to avoid slipping off. In fact, through holes can also be provided on the pipe wall of the first pipe body 21, so that the first bump 14 sliding into the blind end of the first lock 24 can be embedded in the through holes, and the bite and lock between the manhole cover 1 and the upper connecting member 2 can also be realized.

[0039] In some embodiments, as Figure 1 and Figure 2 shown, the double-wall corrugated pipe 3 includes a third pipe body 31 and a corrugated body 32. The corrugated body 32 is constructed on the outside of the third pipe body 31. The corrugated body 32 and the third pipe body 31 form an inner and outer double-wall pipe structure. Before the double-wall corrugated pipe 3 is assembled with the upper connecting member 2, the double-wall corrugated pipe 3 with the required length can be pre-cut according to the burial depth, height and position.

[0040] In some embodiments, as Figure 1 and Figure 2 shown, several second bumps 44 are constructed inwardly at the bottom of the lower connecting member 4. Several second locks 53 are constructed at the position of the outer wall of the manhole body 5 near the open end. The lower connecting member 4 can drive each second bump 44 to slide along the outer wall of the manhole body 5 into each second lock 53 by rotation. The assembly structure between the second lock 53 and the second bump 44 of the lower connecting member 4 described in this embodiment is basically the same as the assembly structure between the manhole cover 1 and the upper connecting member 2 described above, and will not be elaborated here.

[0041] In some embodiments, as Figure 1 and Figure 2As shown, at least one set of skirt edges 52 are configured on the outer wall of the manhole body 5. Each of the second latches 53 is evenly distributed at the same cross-sectional position on the outer wall surface of the manhole body 5, and is located above the skirt edge 52 closest to the open end of the manhole body 5. The skirt edge 52 closest to the open end of the manhole body 5 functions basically the same as the baffle 22 of the upper connecting member 2 above, and can also be combined with the second latch 53 to form a space for the second latch 53 to slide. The same points will not be elaborated here. The differences are as follows: In order to facilitate the installation of the lower connecting member 4 and the manhole body 5, and to prevent the manhole connection device from slipping off the manhole body 5, and also to facilitate the subsequent sealing and fixing between the lower connecting member 4 and the manhole body 5, it is preferred that the aperture of the lower connecting member 4 is larger than the aperture of the manhole body 5, that is, during the assembly process, it is preferred that the open end of the manhole body 5 is inserted into the bottom opening of the lower connecting member 4.

[0042] In some specific embodiments, as Figure 2 shown, the lower connecting member 4 includes a fourth pipe body 41 and a fifth pipe body 43. The fourth pipe body 41 and the fifth pipe body 43 are connected in a stepped manner. The fourth pipe body 41 has a first axis 91, and the fifth pipe body 43 has a second axis 92. The first axis 91 coincides with the axis of the manhole cover 1, the second axis 92 coincides with the axis of the manhole body 5, and the first axis 91 is parallel to or coincides with the second axis 92. If the first axis 91 coincides with the second axis 92, that is, the axes of the manhole cover 1, the manhole connection device, and the manhole body 5 coincide, the structure of the lower connecting member 4 is basically the same as that of the upper connecting member 2, and will not be elaborated here specifically. If the first axis 91 is parallel to the second axis 92, that is, the first axis 91 and the second axis 92 do not coincide, then it is preferred as Figure 2 shown, the fourth pipe body 41 and the fifth pipe body 43 of the lower connecting member 4 are connected in a staggered position to one side. The fourth pipe body 41 and the fifth pipe body 43 connected in a stepped and staggered manner make the lower connecting member 4 form a staggered stepped structure, which can cooperate with the double-wall corrugated pipe 3 to realize the reliable connection between the manhole cover 1 and the manhole body 5 when the axes do not coincide. That is, if the position of the preset manhole cover 1 is not coincident with the axis of the manhole body 5 of the buried equipment due to environmental conditions, the deviation between the first axis 91 and the second axis 92 can be eliminated by the lower connecting member 4 with the above structure.

[0043] In some specific embodiments, as Figure 1 and Figure 2 shown, the lower connecting member 4 further includes a platform 42. The platform 42 is configured at the connection of the fourth pipe body 41 and the fifth pipe body 43, and the platform 42 extends outward relative to the fourth pipe body 41. During the assembly process, the double-wall corrugated pipe 3 is sleeved into the lower connecting member 4. The cross-section of the double-wall corrugated pipe 3 can be placed on the platform 42 of the lower connecting member 4. After sleeving, the two wall surfaces are fixed with stainless steel self-tapping screws, and then foaming glue is injected at the two wall surfaces to complete the fitting.

[0044] It should be noted that if the axis of the manhole cover 1 does not coincide with the axis of the manhole body 5, in the structure of the lower connecting member 4, since the platform 42 is constructed at the connection of the fourth pipe body 41 and the fifth pipe body 43, a partial step is formed on the inner wall at the connection of the fourth pipe body 41 and the fifth pipe body 43. When the manhole body 5 is inserted into the lower connection, the step at the lower connection can rest on the top of the opening end of the manhole body 5, thereby improving the connection reliability between the manhole connection device and the manhole body 5.

[0045] In some specific embodiments, as Figure 1 and Figure 2 shown, the lower connecting member 4 further includes a plurality of reinforcing ribs 45. Each of the reinforcing ribs 45 is connected between the platform 42 and the outer wall of the fifth pipe body 43. The reinforcing ribs 45 form a reinforcing structure in the shape of a triangular inclined plate between the bottom of the platform 42 and the outer wall of the fifth pipe body 43, and can bear the weights of the manhole cover 1, the upper connecting member 2, and the double-wall corrugated pipe 3.

[0046] The buried equipment described in the present utility model includes an equipment main body and a manhole cover 1. The equipment main body is provided with a manhole body 5, and the specific structure of the manhole body 5 is as described above and will not be elaborated herein. The manhole cover 1 is connected to the manhole body 5 through the manhole connection device as described above. The structure of the manhole cover 1 is as described above and will not be elaborated herein. Since the buried equipment is equipped with the above-mentioned manhole connection device, the buried equipment has all the advantages of the above-mentioned manhole connection device, and the same parts will not be elaborated herein. On this basis, the buried equipment can further optimize the structure of the manhole cover 1 for the above-mentioned manhole connection device, improve the strength and load-bearing performance of the manhole cover 1 by arranging ribs 13 on the surface of the cover body, and optimize the structure of the peripheral edge 11, so as to realize the locking assembly with the upper connecting member 2 of the manhole connection device, and further improve the connection strength and disassembly and assembly efficiency between the manhole body 5 and the manhole cover 1 of the buried equipment.

[0047] It should be noted that preferably, the cross-section of the manhole body 5 is circular. The manhole cover 1, the upper connecting member 2, the double-wall corrugated pipe 3, and the lower connecting member 4 are all preferably plastic parts. Among them, preferably, the double-wall corrugated pipe 3 is a national standard part, which is convenient to purchase and can be cut according to the buried depth height to use the length. The standard part polyethylene double-wall corrugated pipe 3 is used as the connection bridge of the manhole connection device, and the length of the double-wall corrugated pipe 3 is cut according to the buried depth requirement of the buried equipment, so as to meet the buried depth requirements of different buried equipment and improve the versatility. The manhole cover 1, the upper connecting member 2, and the lower connecting member 4 are preferably all HDPE rotational molded parts, which have good corrosion resistance, light weight, high strength, simple processing, and low cost. The manhole body 5 of the buried equipment depends on the situation of the buried equipment itself and can be made of steel or plastic, which will not affect the assembly of the buried manhole.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manhole connection device, characterized in that, It includes a connected upper connecting piece, a double-wall corrugated pipe, and a lower connecting piece. The upper connecting piece can be locked and connected to the manhole cover, and the lower connecting piece can be locked and installed at the open end of the manhole body. Among them, the upper connecting piece includes a first pipe body and a second pipe body. The first pipe body and the second pipe body are coaxially connected in a stepped manner. A number of first locking catches are formed on the outer periphery of the first pipe body, and a number of first protrusions are formed inwardly on the peripheral edge of the manhole cover. The manhole cover can drive each of the first protrusions to slide along the outer periphery of the first pipe body and into each of the first locking catches by rotation.

2. The manhole connection device according to claim 1, characterized in that, A number of chutes are formed on the outer periphery of the first pipe body. The first locking catch is formed with an inlet end and a blind end, and the extension section of the inlet end of the first locking catch is provided with the chute. The manhole cover can drive the first protrusion to slide through the chute and reach the blind end through the inlet end of the first locking catch by rotation.

3. The manhole connection device according to claim 1, characterized in that, The upper connecting piece further includes a baffle plate, which is formed at the connection between the first pipe body and the second pipe body and protrudes outward relative to the second pipe body. A groove is formed at the position of the baffle plate facing the double-wall corrugated pipe, and the top end of the double-wall corrugated pipe can be inserted and fixed in the groove.

4. The manhole connection device according to claim 1, characterized in that, A number of second protrusions are formed inwardly at the bottom of the lower connecting piece, and a number of second locking catches are formed on the outer wall of the manhole body near the open end. The lower connecting piece can drive each of the second protrusions to slide along the outer wall of the manhole body and into each of the second locking catches by rotation.

5. The manhole connection device according to claim 4, characterized in that, A number of chutes are formed on the outer periphery of the manhole body. The second locking catch is formed with an inlet end and a blind end, and the extension section of the inlet end of the second locking catch is provided with the chute. The lower connecting piece can drive the second protrusion to slide through the chute and reach the blind end through the inlet end of the second locking catch by rotation.

6. The manhole connection device according to claim 4, characterized in that, At least one group of skirt edges is formed on the outer wall of the manhole body, and each of the second locking catches is evenly distributed at the same cross-sectional position on the outer wall surface of the manhole body and is located above the skirt edge closest to the open end of the manhole body.

7. The manhole connection device according to any one of claims 1-6, characterized in that, The lower connecting piece includes a fourth pipe body and a fifth pipe body, and the fourth pipe body and the fifth pipe body are connected in a stepped manner. The fourth pipe body has a first axis, the fifth pipe body has a second axis, the first axis coincides with the axis of the manhole cover, the second axis coincides with the axis of the manhole body, and the first axis is parallel or coincides with the second axis.

8. The manhole connection device according to claim 7, characterized in that, The lower connecting piece further includes a platform and a number of reinforcing ribs. The platform is formed at the connection between the fourth pipe body and the fifth pipe body, and the platform protrudes outward relative to the fourth pipe body. Each of the reinforcing ribs is connected between the platform and the outer wall of the fifth pipe body.

9. An underground device, characterized in that, Comprising: A device main body is provided with a manhole body. A manhole cover is connected to the manhole body through the manhole connection device according to any one of claims 1-8.

10. The buried device according to claim 9, characterized in that, The manhole cover includes a cover body and a peripheral edge. A number of rib strips are formed on one side of the cover body, and each of the rib strips protrudes outward from the cover body. The peripheral edge is connected to the other side of the cover body.

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